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Comparing Coro/Coro/State.xs (file contents):
Revision 1.77 by root, Tue Oct 31 23:55:33 2006 UTC vs.
Revision 1.397 by root, Fri May 6 21:15:17 2011 UTC

1/* this works around a bug in mingw32 providing a non-working setjmp */
2#define USE_NO_MINGW_SETJMP_TWO_ARGS
3
4#define NDEBUG 1
5
6#include "libcoro/coro.c"
7
1#define PERL_NO_GET_CONTEXT 8#define PERL_NO_GET_CONTEXT
2 9#define PERL_EXT
3#include "libcoro/coro.c"
4 10
5#include "EXTERN.h" 11#include "EXTERN.h"
6#include "perl.h" 12#include "perl.h"
7#include "XSUB.h" 13#include "XSUB.h"
14#include "perliol.h"
8 15
9#include "patchlevel.h" 16#include "schmorp.h"
10 17
11#if PERL_VERSION < 6 18#include <stdio.h>
12# ifndef PL_ppaddr 19#include <errno.h>
13# define PL_ppaddr ppaddr 20#include <assert.h>
14# endif 21
15# ifndef call_sv
16# define call_sv perl_call_sv
17# endif
18# ifndef get_sv
19# define get_sv perl_get_sv
20# endif
21# ifndef get_cv
22# define get_cv perl_get_cv
23# endif
24# ifndef IS_PADGV
25# define IS_PADGV(v) 0
26# endif
27# ifndef IS_PADCONST 22#ifndef SVs_PADSTALE
28# define IS_PADCONST(v) 0 23# define SVs_PADSTALE 0
29# endif
30#endif 24#endif
31 25
32#include <errno.h> 26#if defined(_WIN32)
27# undef HAS_GETTIMEOFDAY
28# undef setjmp
29# undef longjmp
30# undef _exit
31# define setjmp _setjmp /* deep magic */
32#else
33# include <inttypes.h> /* most portable stdint.h */
34#endif
33 35
34#ifdef HAVE_MMAP 36#ifdef HAVE_MMAP
35# include <unistd.h> 37# include <unistd.h>
36# include <sys/mman.h> 38# include <sys/mman.h>
37# ifndef MAP_ANONYMOUS 39# ifndef MAP_ANONYMOUS
… …
39# define MAP_ANONYMOUS MAP_ANON 41# define MAP_ANONYMOUS MAP_ANON
40# else 42# else
41# undef HAVE_MMAP 43# undef HAVE_MMAP
42# endif 44# endif
43# endif 45# endif
46# include <limits.h>
47# ifndef PAGESIZE
48# define PAGESIZE pagesize
49# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
50static long pagesize;
51# else
52# define BOOT_PAGESIZE (void)0
53# endif
54#else
55# define PAGESIZE 0
56# define BOOT_PAGESIZE (void)0
44#endif 57#endif
45 58
46#define SUB_INIT "Coro::State::initialize" 59#if CORO_USE_VALGRIND
47#define UCORO_STATE "_coro_state" 60# include <valgrind/valgrind.h>
61#endif
48 62
49/* The next macro should declare a variable stacklevel that contains and approximation 63/* the maximum number of idle cctx that will be pooled */
50 * to the current C stack pointer. Its property is that it changes with each call 64static int cctx_max_idle = 4;
51 * and should be unique. */ 65
66#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
67# undef CORO_STACKGUARD
68#endif
69
70#ifndef CORO_STACKGUARD
71# define CORO_STACKGUARD 0
72#endif
73
74/* prefer perl internal functions over our own? */
75#ifndef CORO_PREFER_PERL_FUNCTIONS
76# define CORO_PREFER_PERL_FUNCTIONS 0
77#endif
78
79/* The next macros try to return the current stack pointer, in an as
80 * portable way as possible. */
81#if __GNUC__ >= 4
82# define dSTACKLEVEL int stacklevel_dummy
83# define STACKLEVEL __builtin_frame_address (0)
84#else
85# define dSTACKLEVEL volatile void *stacklevel
52#define dSTACKLEVEL void *stacklevel = &stacklevel 86# define STACKLEVEL ((void *)&stacklevel)
87#endif
53 88
54#define IN_DESTRUCT (PL_main_cv == Nullcv) 89#define IN_DESTRUCT PL_dirty
55 90
56#define labs(l) ((l) >= 0 ? (l) : -(l)) 91#if __GNUC__ >= 3
92# define attribute(x) __attribute__(x)
93# define expect(expr,value) __builtin_expect ((expr), (value))
94# define INLINE static inline
95#else
96# define attribute(x)
97# define expect(expr,value) (expr)
98# define INLINE static
99#endif
100
101#define expect_false(expr) expect ((expr) != 0, 0)
102#define expect_true(expr) expect ((expr) != 0, 1)
103
104#define NOINLINE attribute ((noinline))
57 105
58#include "CoroAPI.h" 106#include "CoroAPI.h"
107#define GCoroAPI (&coroapi) /* very sneaky */
59 108
60#ifdef USE_ITHREADS 109#ifdef USE_ITHREADS
61static perl_mutex coro_mutex; 110# if CORO_PTHREAD
62# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0) 111static void *coro_thx;
63# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0) 112# endif
64#else
65# define LOCK (void)0
66# define UNLOCK (void)0
67#endif 113#endif
68 114
115#ifdef __linux
116# include <time.h> /* for timespec */
117# include <syscall.h> /* for SYS_* */
118# ifdef SYS_clock_gettime
119# define coro_clock_gettime(id, ts) syscall (SYS_clock_gettime, (id), (ts))
120# define CORO_CLOCK_MONOTONIC 1
121# define CORO_CLOCK_THREAD_CPUTIME_ID 3
122# endif
123#endif
124
125static double (*nvtime)(); /* so why doesn't it take void? */
126static void (*u2time)(pTHX_ UV ret[2]);
127
128/* we hijack an hopefully unused CV flag for our purposes */
129#define CVf_SLF 0x4000
130static OP *pp_slf (pTHX);
131static void slf_destroy (pTHX_ struct coro *coro);
132
133static U32 cctx_gen;
134static size_t cctx_stacksize = CORO_STACKSIZE;
69static struct CoroAPI coroapi; 135static struct CoroAPI coroapi;
70static AV *main_mainstack; /* used to differentiate between $main and others */ 136static AV *main_mainstack; /* used to differentiate between $main and others */
137static JMPENV *main_top_env;
71static HV *coro_state_stash; 138static HV *coro_state_stash, *coro_stash;
72static SV *ucoro_state_sv;
73static U32 ucoro_state_hash;
74static SV *coro_mortal; /* will be freed after next transfer */ 139static volatile SV *coro_mortal; /* will be freed/thrown after next transfer */
75 140
76/* this is actually not only the c stack but also c registers etc... */ 141static AV *av_destroy; /* destruction queue */
142static SV *sv_manager; /* the manager coro */
143static SV *sv_idle; /* $Coro::idle */
144
145static GV *irsgv; /* $/ */
146static GV *stdoutgv; /* *STDOUT */
147static SV *rv_diehook;
148static SV *rv_warnhook;
149static HV *hv_sig; /* %SIG */
150
151/* async_pool helper stuff */
152static SV *sv_pool_rss;
153static SV *sv_pool_size;
154static SV *sv_async_pool_idle; /* description string */
155static AV *av_async_pool; /* idle pool */
156static SV *sv_Coro; /* class string */
157static CV *cv_pool_handler;
158
159/* Coro::AnyEvent */
160static SV *sv_activity;
161
162/* enable processtime/realtime profiling */
163static char enable_times;
164typedef U32 coro_ts[2];
165static coro_ts time_real, time_cpu;
166static char times_valid;
167
168static struct coro_cctx *cctx_first;
169static int cctx_count, cctx_idle;
170
171enum {
172 CC_MAPPED = 0x01,
173 CC_NOREUSE = 0x02, /* throw this away after tracing */
174 CC_TRACE = 0x04,
175 CC_TRACE_SUB = 0x08, /* trace sub calls */
176 CC_TRACE_LINE = 0x10, /* trace each statement */
177 CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
178};
179
180/* this is a structure representing a c-level coroutine */
77typedef struct { 181typedef struct coro_cctx
78 int refcnt; /* pointer reference counter */ 182{
79 int usecnt; /* shared by how many coroutines */ 183 struct coro_cctx *next;
80 int gencnt; /* generation counter */
81 184
185 /* the stack */
186 void *sptr;
187 size_t ssize;
188
189 /* cpu state */
190 void *idle_sp; /* sp of top-level transfer/schedule/cede call */
191 JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
192 JMPENV *top_env;
82 coro_context cctx; 193 coro_context cctx;
83 194
84 void *sptr; 195 U32 gen;
85 long ssize; /* positive == mmap, otherwise malloc */ 196#if CORO_USE_VALGRIND
86} coro_stack; 197 int valgrind_id;
198#endif
199 unsigned char flags;
200} coro_cctx;
87 201
202static coro_cctx *cctx_current; /* the currently running cctx */
203
204/*****************************************************************************/
205
206enum {
207 CF_RUNNING = 0x0001, /* coroutine is running */
208 CF_READY = 0x0002, /* coroutine is ready */
209 CF_NEW = 0x0004, /* has never been switched to */
210 CF_DESTROYED = 0x0008, /* coroutine data has been freed */
211 CF_SUSPENDED = 0x0010, /* coroutine can't be scheduled */
212 CF_NOCANCEL = 0x0020, /* cannot cancel, set slf_frame.data to 1 (hackish) */
213};
214
215/* the structure where most of the perl state is stored, overlaid on the cxstack */
216typedef struct
217{
218 SV *defsv;
219 AV *defav;
220 SV *errsv;
221 SV *irsgv;
222 HV *hinthv;
223#define VAR(name,type) type name;
224# include "state.h"
225#undef VAR
226} perl_slots;
227
228#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
229
230/* this is a structure representing a perl-level coroutine */
88struct coro { 231struct coro {
89 /* the top-level JMPENV for each coroutine, needed to catch dies. */ 232 /* the C coroutine allocated to this perl coroutine, if any */
90 JMPENV start_env; 233 coro_cctx *cctx;
91 234
92 /* the optional C context */ 235 /* ready queue */
93 coro_stack *stack; 236 struct coro *next_ready;
94 void *cursp;
95 int gencnt;
96 237
97 /* optionally saved, might be zero */ 238 /* state data */
98 AV *defav; 239 struct CoroSLF slf_frame; /* saved slf frame */
99 SV *defsv;
100 SV *errsv;
101
102 /* saved global state not related to stacks */
103 U8 dowarn;
104 I32 in_eval;
105
106 /* the stacks and related info (callchain etc..) */
107 PERL_SI *curstackinfo;
108 AV *curstack;
109 AV *mainstack; 240 AV *mainstack;
110 SV **stack_sp; 241 perl_slots *slot; /* basically the saved sp */
111 OP *op;
112 SV **curpad;
113 AV *comppad;
114 CV *compcv;
115 SV **stack_base;
116 SV **stack_max;
117 SV **tmps_stack;
118 I32 tmps_floor;
119 I32 tmps_ix;
120 I32 tmps_max;
121 I32 *markstack;
122 I32 *markstack_ptr;
123 I32 *markstack_max;
124 I32 *scopestack;
125 I32 scopestack_ix;
126 I32 scopestack_max;
127 ANY *savestack;
128 I32 savestack_ix;
129 I32 savestack_max;
130 OP **retstack;
131 I32 retstack_ix;
132 I32 retstack_max;
133 PMOP *curpm;
134 COP *curcop;
135 JMPENV *top_env;
136 242
243 CV *startcv; /* the CV to execute */
137 /* data associated with this coroutine (initial args) */ 244 AV *args; /* data associated with this coroutine (initial args) */
138 AV *args; 245 int refcnt; /* coroutines are refcounted, yes */
246 int flags; /* CF_ flags */
247 HV *hv; /* the perl hash associated with this coro, if any */
248
249 /* statistics */
250 int usecount; /* number of transfers to this coro */
251
252 /* coro process data */
253 int prio;
254 SV *except; /* exception to be thrown */
255 SV *rouse_cb;
256
257 /* async_pool */
258 SV *saved_deffh;
259 SV *invoke_cb;
260 AV *invoke_av;
261
262 /* on_enter/on_leave */
263 AV *on_enter;
264 AV *on_leave;
265
266 /* swap_sv */
267 AV *swap_sv;
268
269 /* times */
270 coro_ts t_cpu, t_real;
271
272 /* linked list */
273 struct coro *next, *prev;
139}; 274};
140 275
141typedef struct coro *Coro__State; 276typedef struct coro *Coro__State;
142typedef struct coro *Coro__State_or_hashref; 277typedef struct coro *Coro__State_or_hashref;
143 278
279/* the following variables are effectively part of the perl context */
280/* and get copied between struct coro and these variables */
281/* the main reason we don't support windows process emulation */
282static struct CoroSLF slf_frame; /* the current slf frame */
283
284/** Coro ********************************************************************/
285
286#define CORO_PRIO_MAX 3
287#define CORO_PRIO_HIGH 1
288#define CORO_PRIO_NORMAL 0
289#define CORO_PRIO_LOW -1
290#define CORO_PRIO_IDLE -3
291#define CORO_PRIO_MIN -4
292
293/* for Coro.pm */
294static SV *coro_current;
295static SV *coro_readyhook;
296static struct coro *coro_ready [CORO_PRIO_MAX - CORO_PRIO_MIN + 1][2]; /* head|tail */
297static CV *cv_coro_run;
298static struct coro *coro_first;
299#define coro_nready coroapi.nready
300
301/** Coro::Select ************************************************************/
302
303static OP *(*coro_old_pp_sselect) (pTHX);
304static SV *coro_select_select;
305
306/* horrible hack, but if it works... */
307static OP *
308coro_pp_sselect (pTHX)
309{
310 dSP;
311 PUSHMARK (SP - 4); /* fake argument list */
312 XPUSHs (coro_select_select);
313 PUTBACK;
314
315 /* entersub is an UNOP, select a LISTOP... keep your fingers crossed */
316 PL_op->op_flags |= OPf_STACKED;
317 PL_op->op_private = 0;
318 return PL_ppaddr [OP_ENTERSUB](aTHX);
319}
320
321/** time stuff **************************************************************/
322
323#ifdef HAS_GETTIMEOFDAY
324
325static void
326coro_u2time (pTHX_ UV ret[2])
327{
328 struct timeval tv;
329 gettimeofday (&tv, 0);
330
331 ret [0] = tv.tv_sec;
332 ret [1] = tv.tv_usec;
333}
334
335static double
336coro_nvtime ()
337{
338 struct timeval tv;
339 gettimeofday (&tv, 0);
340
341 return tv.tv_sec + tv.tv_usec * 1e-6;
342}
343
344static void
345time_init (pTHX)
346{
347 nvtime = coro_nvtime;
348 u2time = coro_u2time;
349}
350
351#else
352
353static void
354time_init (pTHX)
355{
356 SV **svp;
357
358 require_pv ("Time/HiRes.pm");
359
360 svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0);
361
362 if (!svp) croak ("Time::HiRes is required, but missing. Caught");
363 if (!SvIOK (*svp)) croak ("Time::NVtime isn't a function pointer. Caught");
364
365 nvtime = INT2PTR (double (*)(), SvIV (*svp));
366
367 svp = hv_fetch (PL_modglobal, "Time::U2time", 12, 0);
368 u2time = INT2PTR (void (*)(pTHX_ UV ret[2]), SvIV (*svp));
369}
370
371#endif
372
373/** lowlevel stuff **********************************************************/
374
375static SV *
376coro_get_sv (pTHX_ const char *name, int create)
377{
378#if PERL_VERSION_ATLEAST (5,10,0)
379 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
380 get_sv (name, create);
381#endif
382 return get_sv (name, create);
383}
384
144static AV * 385static AV *
386coro_get_av (pTHX_ const char *name, int create)
387{
388#if PERL_VERSION_ATLEAST (5,10,0)
389 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
390 get_av (name, create);
391#endif
392 return get_av (name, create);
393}
394
395static HV *
396coro_get_hv (pTHX_ const char *name, int create)
397{
398#if PERL_VERSION_ATLEAST (5,10,0)
399 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
400 get_hv (name, create);
401#endif
402 return get_hv (name, create);
403}
404
405INLINE void
406coro_times_update ()
407{
408#ifdef coro_clock_gettime
409 struct timespec ts;
410
411 ts.tv_sec = ts.tv_nsec = 0;
412 coro_clock_gettime (CORO_CLOCK_THREAD_CPUTIME_ID, &ts);
413 time_cpu [0] = ts.tv_sec; time_cpu [1] = ts.tv_nsec;
414
415 ts.tv_sec = ts.tv_nsec = 0;
416 coro_clock_gettime (CORO_CLOCK_MONOTONIC, &ts);
417 time_real [0] = ts.tv_sec; time_real [1] = ts.tv_nsec;
418#else
419 dTHX;
420 UV tv[2];
421
422 u2time (aTHX_ tv);
423 time_real [0] = tv [0];
424 time_real [1] = tv [1] * 1000;
425#endif
426}
427
428INLINE void
429coro_times_add (struct coro *c)
430{
431 c->t_real [1] += time_real [1];
432 if (c->t_real [1] > 1000000000) { c->t_real [1] -= 1000000000; ++c->t_real [0]; }
433 c->t_real [0] += time_real [0];
434
435 c->t_cpu [1] += time_cpu [1];
436 if (c->t_cpu [1] > 1000000000) { c->t_cpu [1] -= 1000000000; ++c->t_cpu [0]; }
437 c->t_cpu [0] += time_cpu [0];
438}
439
440INLINE void
441coro_times_sub (struct coro *c)
442{
443 if (c->t_real [1] < time_real [1]) { c->t_real [1] += 1000000000; --c->t_real [0]; }
444 c->t_real [1] -= time_real [1];
445 c->t_real [0] -= time_real [0];
446
447 if (c->t_cpu [1] < time_cpu [1]) { c->t_cpu [1] += 1000000000; --c->t_cpu [0]; }
448 c->t_cpu [1] -= time_cpu [1];
449 c->t_cpu [0] -= time_cpu [0];
450}
451
452/*****************************************************************************/
453/* magic glue */
454
455#define CORO_MAGIC_type_cv 26
456#define CORO_MAGIC_type_state PERL_MAGIC_ext
457
458#define CORO_MAGIC_NN(sv, type) \
459 (expect_true (SvMAGIC (sv)->mg_type == type) \
460 ? SvMAGIC (sv) \
461 : mg_find (sv, type))
462
463#define CORO_MAGIC(sv, type) \
464 (expect_true (SvMAGIC (sv)) \
465 ? CORO_MAGIC_NN (sv, type) \
466 : 0)
467
468#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
469#define CORO_MAGIC_state(sv) CORO_MAGIC_NN (((SV *)(sv)), CORO_MAGIC_type_state)
470
471INLINE struct coro *
472SvSTATE_ (pTHX_ SV *coro)
473{
474 HV *stash;
475 MAGIC *mg;
476
477 if (SvROK (coro))
478 coro = SvRV (coro);
479
480 if (expect_false (SvTYPE (coro) != SVt_PVHV))
481 croak ("Coro::State object required");
482
483 stash = SvSTASH (coro);
484 if (expect_false (stash != coro_stash && stash != coro_state_stash))
485 {
486 /* very slow, but rare, check */
487 if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
488 croak ("Coro::State object required");
489 }
490
491 mg = CORO_MAGIC_state (coro);
492 return (struct coro *)mg->mg_ptr;
493}
494
495#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
496
497/* faster than SvSTATE, but expects a coroutine hv */
498#define SvSTATE_hv(hv) ((struct coro *)CORO_MAGIC_NN ((SV *)hv, CORO_MAGIC_type_state)->mg_ptr)
499#define SvSTATE_current SvSTATE_hv (SvRV (coro_current))
500
501/*****************************************************************************/
502/* padlist management and caching */
503
504static AV *
145coro_clone_padlist (pTHX_ CV *cv) 505coro_derive_padlist (pTHX_ CV *cv)
146{ 506{
147 AV *padlist = CvPADLIST (cv); 507 AV *padlist = CvPADLIST (cv);
148 AV *newpadlist, *newpad; 508 AV *newpadlist, *newpad;
149 509
150 newpadlist = newAV (); 510 newpadlist = newAV ();
151 AvREAL_off (newpadlist); 511 AvREAL_off (newpadlist);
512#if PERL_VERSION_ATLEAST (5,10,0)
513 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
514#else
152 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1); 515 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
516#endif
153 newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)]; 517 newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
154 --AvFILLp (padlist); 518 --AvFILLp (padlist);
155 519
156 av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE))); 520 av_store (newpadlist, 0, SvREFCNT_inc_NN (AvARRAY (padlist)[0]));
157 av_store (newpadlist, 1, (SV *)newpad); 521 av_store (newpadlist, 1, (SV *)newpad);
158 522
159 return newpadlist; 523 return newpadlist;
160} 524}
161 525
162static void 526static void
163free_padlist (pTHX_ AV *padlist) 527free_padlist (pTHX_ AV *padlist)
164{ 528{
165 /* may be during global destruction */ 529 /* may be during global destruction */
166 if (SvREFCNT (padlist)) 530 if (!IN_DESTRUCT)
167 { 531 {
168 I32 i = AvFILLp (padlist); 532 I32 i = AvFILLp (padlist);
169 while (i >= 0) 533
534 while (i > 0) /* special-case index 0 */
170 { 535 {
171 SV **svp = av_fetch (padlist, i--, FALSE); 536 /* we try to be extra-careful here */
172 if (svp) 537 AV *av = (AV *)AvARRAY (padlist)[i--];
173 { 538 I32 j = AvFILLp (av);
174 SV *sv; 539
175 while (&PL_sv_undef != (sv = av_pop ((AV *)*svp))) 540 while (j >= 0)
541 SvREFCNT_dec (AvARRAY (av)[j--]);
542
543 AvFILLp (av) = -1;
176 SvREFCNT_dec (sv); 544 SvREFCNT_dec (av);
177
178 SvREFCNT_dec (*svp);
179 }
180 } 545 }
181 546
547 SvREFCNT_dec (AvARRAY (padlist)[0]);
548
549 AvFILLp (padlist) = -1;
182 SvREFCNT_dec ((SV*)padlist); 550 SvREFCNT_dec ((SV*)padlist);
183 } 551 }
184} 552}
185 553
186static int 554static int
187coro_cv_free (pTHX_ SV *sv, MAGIC *mg) 555coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
188{ 556{
189 AV *padlist; 557 AV *padlist;
190 AV *av = (AV *)mg->mg_obj; 558 AV *av = (AV *)mg->mg_obj;
559
560 /* perl manages to free our internal AV and _then_ call us */
561 if (IN_DESTRUCT)
562 return 0;
191 563
192 /* casting is fun. */ 564 /* casting is fun. */
193 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av))) 565 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
194 free_padlist (aTHX_ padlist); 566 free_padlist (aTHX_ padlist);
195 567
196 SvREFCNT_dec (av); 568 SvREFCNT_dec (av); /* sv_magicext increased the refcount */
197 569
198 return 0; 570 return 0;
199} 571}
200 572
201#define PERL_MAGIC_coro PERL_MAGIC_ext 573static MGVTBL coro_cv_vtbl = {
202 574 0, 0, 0, 0,
203static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free}; 575 coro_cv_free
576};
204 577
205/* the next two functions merely cache the padlists */ 578/* the next two functions merely cache the padlists */
206static void 579static void
207get_padlist (pTHX_ CV *cv) 580get_padlist (pTHX_ CV *cv)
208{ 581{
209 MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro); 582 MAGIC *mg = CORO_MAGIC_cv (cv);
583 AV *av;
210 584
211 if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0) 585 if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
212 CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj); 586 CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
213 else 587 else
214 { 588 {
215#if 0 589#if CORO_PREFER_PERL_FUNCTIONS
216 /* this should work - but it doesn't :( */ 590 /* this is probably cleaner? but also slower! */
591 /* in practise, it seems to be less stable */
217 CV *cp = Perl_cv_clone (aTHX_ cv); 592 CV *cp = Perl_cv_clone (aTHX_ cv);
218 CvPADLIST (cv) = CvPADLIST (cp); 593 CvPADLIST (cv) = CvPADLIST (cp);
219 CvPADLIST (cp) = 0; 594 CvPADLIST (cp) = 0;
220 SvREFCNT_dec (cp); 595 SvREFCNT_dec (cp);
221#else 596#else
222 CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv); 597 CvPADLIST (cv) = coro_derive_padlist (aTHX_ cv);
223#endif 598#endif
224 } 599 }
225} 600}
226 601
227static void 602static void
228put_padlist (pTHX_ CV *cv) 603put_padlist (pTHX_ CV *cv)
229{ 604{
230 MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro); 605 MAGIC *mg = CORO_MAGIC_cv (cv);
606 AV *av;
231 607
232 if (!mg) 608 if (expect_false (!mg))
609 mg = sv_magicext ((SV *)cv, (SV *)newAV (), CORO_MAGIC_type_cv, &coro_cv_vtbl, 0, 0);
610
611 av = (AV *)mg->mg_obj;
612
613 if (expect_false (AvFILLp (av) >= AvMAX (av)))
614 av_extend (av, AvFILLp (av) + 1);
615
616 AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
617}
618
619/** load & save, init *******************************************************/
620
621/* swap sv heads, at least logically */
622static void
623swap_svs (pTHX_ Coro__State c)
624{
625 int i;
626
627 for (i = 0; i <= AvFILLp (c->swap_sv); )
628 {
629 SV *a = AvARRAY (c->swap_sv)[i++];
630 SV *b = AvARRAY (c->swap_sv)[i++];
631
632 const U32 keep = SVs_PADSTALE | SVs_PADTMP | SVs_PADMY; /* keep these flags */
633 SV tmp;
634
635 /* swap sv_any */
636 SvANY (&tmp) = SvANY (a); SvANY (a) = SvANY (b); SvANY (b) = SvANY (&tmp);
637
638 /* swap sv_flags */
639 SvFLAGS (&tmp) = SvFLAGS (a);
640 SvFLAGS (a) = (SvFLAGS (a) & keep) | (SvFLAGS (b ) & ~keep);
641 SvFLAGS (b) = (SvFLAGS (b) & keep) | (SvFLAGS (&tmp) & ~keep);
642
643#if PERL_VERSION_ATLEAST (5,10,0)
644 /* perl 5.10 complicates this _quite_ a bit, but it also is
645 * much faster, so no quarrels here. alternatively, we could
646 * sv_upgrade to avoid this.
647 */
233 { 648 {
234 sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0); 649 /* swap sv_u */
235 mg = mg_find ((SV *)cv, PERL_MAGIC_coro); 650 tmp.sv_u = a->sv_u; a->sv_u = b->sv_u; b->sv_u = tmp.sv_u;
236 mg->mg_virtual = &vtbl_coro; 651
237 mg->mg_obj = (SV *)newAV (); 652 /* if SvANY points to the head, we need to adjust the pointers,
653 * as the pointer for a still points to b, and maybe vice versa.
654 */
655 #define svany_in_head(type) \
656 (((1 << SVt_NULL) | (1 << SVt_BIND) | (1 << SVt_IV) | (1 << SVt_RV)) & (1 << (type)))
657
658 if (svany_in_head (SvTYPE (a)))
659 SvANY (a) = (void *)((PTRV)SvANY (a) - (PTRV)b + (PTRV)a);
660
661 if (svany_in_head (SvTYPE (b)))
662 SvANY (b) = (void *)((PTRV)SvANY (b) - (PTRV)a + (PTRV)b);
238 } 663 }
239 664#endif
240 av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv)); 665 }
241} 666}
242 667
243#define SB do { 668#define SWAP_SVS(coro) \
244#define SE } while (0) 669 if (expect_false ((coro)->swap_sv)) \
670 swap_svs (aTHX_ (coro))
245 671
246#define LOAD(state) load_state(aTHX_ (state));
247#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
248
249#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE
250
251static void 672static void
673on_enterleave_call (pTHX_ SV *cb);
674
675static void
252load_state(pTHX_ Coro__State c) 676load_perl (pTHX_ Coro__State c)
253{ 677{
254 PL_dowarn = c->dowarn; 678 perl_slots *slot = c->slot;
255 PL_in_eval = c->in_eval; 679 c->slot = 0;
256 680
257 PL_curstackinfo = c->curstackinfo;
258 PL_curstack = c->curstack;
259 PL_mainstack = c->mainstack; 681 PL_mainstack = c->mainstack;
260 PL_stack_sp = c->stack_sp;
261 PL_op = c->op;
262 PL_curpad = c->curpad;
263 PL_comppad = c->comppad;
264 PL_compcv = c->compcv;
265 PL_stack_base = c->stack_base;
266 PL_stack_max = c->stack_max;
267 PL_tmps_stack = c->tmps_stack;
268 PL_tmps_floor = c->tmps_floor;
269 PL_tmps_ix = c->tmps_ix;
270 PL_tmps_max = c->tmps_max;
271 PL_markstack = c->markstack;
272 PL_markstack_ptr = c->markstack_ptr;
273 PL_markstack_max = c->markstack_max;
274 PL_scopestack = c->scopestack;
275 PL_scopestack_ix = c->scopestack_ix;
276 PL_scopestack_max = c->scopestack_max;
277 PL_savestack = c->savestack;
278 PL_savestack_ix = c->savestack_ix;
279 PL_savestack_max = c->savestack_max;
280#if PERL_VERSION < 9
281 PL_retstack = c->retstack;
282 PL_retstack_ix = c->retstack_ix;
283 PL_retstack_max = c->retstack_max;
284#endif
285 PL_curpm = c->curpm;
286 PL_curcop = c->curcop;
287 PL_top_env = c->top_env;
288 682
289 if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav); 683 GvSV (PL_defgv) = slot->defsv;
290 if (c->defsv) REPLACE_SV (DEFSV , c->defsv); 684 GvAV (PL_defgv) = slot->defav;
291 if (c->errsv) REPLACE_SV (ERRSV , c->errsv); 685 GvSV (PL_errgv) = slot->errsv;
686 GvSV (irsgv) = slot->irsgv;
687 GvHV (PL_hintgv) = slot->hinthv;
688
689 #define VAR(name,type) PL_ ## name = slot->name;
690 # include "state.h"
691 #undef VAR
292 692
293 { 693 {
294 dSP; 694 dSP;
695
295 CV *cv; 696 CV *cv;
296 697
297 /* now do the ugly restore mess */ 698 /* now do the ugly restore mess */
298 while ((cv = (CV *)POPs)) 699 while (expect_true (cv = (CV *)POPs))
299 { 700 {
300 AV *padlist = (AV *)POPs;
301
302 if (padlist)
303 {
304 put_padlist (aTHX_ cv); /* mark this padlist as available */ 701 put_padlist (aTHX_ cv); /* mark this padlist as available */
305 CvPADLIST(cv) = padlist; 702 CvDEPTH (cv) = PTR2IV (POPs);
306 } 703 CvPADLIST (cv) = (AV *)POPs;
307
308 ++CvDEPTH(cv);
309 } 704 }
310 705
311 PUTBACK; 706 PUTBACK;
312 } 707 }
313}
314 708
709 slf_frame = c->slf_frame;
710 CORO_THROW = c->except;
711
712 if (expect_false (enable_times))
713 {
714 if (expect_false (!times_valid))
715 coro_times_update ();
716
717 coro_times_sub (c);
718 }
719
720 if (expect_false (c->on_enter))
721 {
722 int i;
723
724 for (i = 0; i <= AvFILLp (c->on_enter); ++i)
725 on_enterleave_call (aTHX_ AvARRAY (c->on_enter)[i]);
726 }
727
728 SWAP_SVS (c);
729}
730
315static void 731static void
316save_state(pTHX_ Coro__State c, int flags) 732save_perl (pTHX_ Coro__State c)
317{ 733{
734 SWAP_SVS (c);
735
736 if (expect_false (c->on_leave))
737 {
738 int i;
739
740 for (i = AvFILLp (c->on_leave); i >= 0; --i)
741 on_enterleave_call (aTHX_ AvARRAY (c->on_leave)[i]);
742 }
743
744 times_valid = 0;
745
746 if (expect_false (enable_times))
747 {
748 coro_times_update (); times_valid = 1;
749 coro_times_add (c);
750 }
751
752 c->except = CORO_THROW;
753 c->slf_frame = slf_frame;
754
318 { 755 {
319 dSP; 756 dSP;
320 I32 cxix = cxstack_ix; 757 I32 cxix = cxstack_ix;
321 PERL_CONTEXT *ccstk = cxstack; 758 PERL_CONTEXT *ccstk = cxstack;
322 PERL_SI *top_si = PL_curstackinfo; 759 PERL_SI *top_si = PL_curstackinfo;
… …
324 /* 761 /*
325 * the worst thing you can imagine happens first - we have to save 762 * the worst thing you can imagine happens first - we have to save
326 * (and reinitialize) all cv's in the whole callchain :( 763 * (and reinitialize) all cv's in the whole callchain :(
327 */ 764 */
328 765
329 PUSHs (Nullsv); 766 XPUSHs (Nullsv);
330 /* this loop was inspired by pp_caller */ 767 /* this loop was inspired by pp_caller */
331 for (;;) 768 for (;;)
332 { 769 {
333 while (cxix >= 0) 770 while (expect_true (cxix >= 0))
334 { 771 {
335 PERL_CONTEXT *cx = &ccstk[cxix--]; 772 PERL_CONTEXT *cx = &ccstk[cxix--];
336 773
337 if (CxTYPE(cx) == CXt_SUB) 774 if (expect_true (CxTYPE (cx) == CXt_SUB) || expect_false (CxTYPE (cx) == CXt_FORMAT))
338 { 775 {
339 CV *cv = cx->blk_sub.cv; 776 CV *cv = cx->blk_sub.cv;
777
340 if (CvDEPTH(cv)) 778 if (expect_true (CvDEPTH (cv)))
341 { 779 {
342 EXTEND (SP, CvDEPTH(cv)*2); 780 EXTEND (SP, 3);
343
344 while (--CvDEPTH(cv))
345 {
346 /* this tells the restore code to increment CvDEPTH */
347 PUSHs (Nullsv);
348 PUSHs ((SV *)cv);
349 }
350
351 PUSHs ((SV *)CvPADLIST(cv)); 781 PUSHs ((SV *)CvPADLIST (cv));
782 PUSHs (INT2PTR (SV *, (IV)CvDEPTH (cv)));
352 PUSHs ((SV *)cv); 783 PUSHs ((SV *)cv);
353 784
785 CvDEPTH (cv) = 0;
354 get_padlist (aTHX_ cv); 786 get_padlist (aTHX_ cv);
355 } 787 }
356 } 788 }
357#ifdef CXt_FORMAT
358 else if (CxTYPE(cx) == CXt_FORMAT)
359 {
360 /* I never used formats, so how should I know how these are implemented? */
361 /* my bold guess is as a simple, plain sub... */
362 croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
363 }
364#endif
365 } 789 }
366 790
367 if (top_si->si_type == PERLSI_MAIN) 791 if (expect_true (top_si->si_type == PERLSI_MAIN))
368 break; 792 break;
369 793
370 top_si = top_si->si_prev; 794 top_si = top_si->si_prev;
371 ccstk = top_si->si_cxstack; 795 ccstk = top_si->si_cxstack;
372 cxix = top_si->si_cxix; 796 cxix = top_si->si_cxix;
373 } 797 }
374 798
375 PUTBACK; 799 PUTBACK;
376 } 800 }
377 801
378 c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0; 802 /* allocate some space on the context stack for our purposes */
379 c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0; 803 /* we manually unroll here, as usually 2 slots is enough */
380 c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0; 804 if (SLOT_COUNT >= 1) CXINC;
805 if (SLOT_COUNT >= 2) CXINC;
806 if (SLOT_COUNT >= 3) CXINC;
807 {
808 unsigned int i;
809 for (i = 3; i < SLOT_COUNT; ++i)
810 CXINC;
811 }
812 cxstack_ix -= SLOT_COUNT; /* undo allocation */
381 813
382 c->dowarn = PL_dowarn;
383 c->in_eval = PL_in_eval;
384
385 c->curstackinfo = PL_curstackinfo;
386 c->curstack = PL_curstack;
387 c->mainstack = PL_mainstack; 814 c->mainstack = PL_mainstack;
388 c->stack_sp = PL_stack_sp; 815
389 c->op = PL_op; 816 {
390 c->curpad = PL_curpad; 817 perl_slots *slot = c->slot = (perl_slots *)(cxstack + cxstack_ix + 1);
391 c->comppad = PL_comppad; 818
392 c->compcv = PL_compcv; 819 slot->defav = GvAV (PL_defgv);
393 c->stack_base = PL_stack_base; 820 slot->defsv = DEFSV;
394 c->stack_max = PL_stack_max; 821 slot->errsv = ERRSV;
395 c->tmps_stack = PL_tmps_stack; 822 slot->irsgv = GvSV (irsgv);
396 c->tmps_floor = PL_tmps_floor; 823 slot->hinthv = GvHV (PL_hintgv);
397 c->tmps_ix = PL_tmps_ix; 824
398 c->tmps_max = PL_tmps_max; 825 #define VAR(name,type) slot->name = PL_ ## name;
399 c->markstack = PL_markstack; 826 # include "state.h"
400 c->markstack_ptr = PL_markstack_ptr; 827 #undef VAR
401 c->markstack_max = PL_markstack_max; 828 }
402 c->scopestack = PL_scopestack;
403 c->scopestack_ix = PL_scopestack_ix;
404 c->scopestack_max = PL_scopestack_max;
405 c->savestack = PL_savestack;
406 c->savestack_ix = PL_savestack_ix;
407 c->savestack_max = PL_savestack_max;
408#if PERL_VERSION < 9
409 c->retstack = PL_retstack;
410 c->retstack_ix = PL_retstack_ix;
411 c->retstack_max = PL_retstack_max;
412#endif
413 c->curpm = PL_curpm;
414 c->curcop = PL_curcop;
415 c->top_env = PL_top_env;
416} 829}
417 830
418/* 831/*
419 * allocate various perl stacks. This is an exact copy 832 * allocate various perl stacks. This is almost an exact copy
420 * of perl.c:init_stacks, except that it uses less memory 833 * of perl.c:init_stacks, except that it uses less memory
421 * on the (sometimes correct) assumption that coroutines do 834 * on the (sometimes correct) assumption that coroutines do
422 * not usually need a lot of stackspace. 835 * not usually need a lot of stackspace.
423 */ 836 */
837#if CORO_PREFER_PERL_FUNCTIONS
838# define coro_init_stacks(thx) init_stacks ()
839#else
424static void 840static void
425coro_init_stacks (pTHX) 841coro_init_stacks (pTHX)
426{ 842{
427 LOCK; 843 PL_curstackinfo = new_stackinfo(32, 8);
428
429 PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
430 PL_curstackinfo->si_type = PERLSI_MAIN; 844 PL_curstackinfo->si_type = PERLSI_MAIN;
431 PL_curstack = PL_curstackinfo->si_stack; 845 PL_curstack = PL_curstackinfo->si_stack;
432 PL_mainstack = PL_curstack; /* remember in case we switch stacks */ 846 PL_mainstack = PL_curstack; /* remember in case we switch stacks */
433 847
434 PL_stack_base = AvARRAY(PL_curstack); 848 PL_stack_base = AvARRAY(PL_curstack);
435 PL_stack_sp = PL_stack_base; 849 PL_stack_sp = PL_stack_base;
436 PL_stack_max = PL_stack_base + AvMAX(PL_curstack); 850 PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
437 851
438 New(50,PL_tmps_stack,96,SV*); 852 New(50,PL_tmps_stack,32,SV*);
439 PL_tmps_floor = -1; 853 PL_tmps_floor = -1;
440 PL_tmps_ix = -1; 854 PL_tmps_ix = -1;
441 PL_tmps_max = 96; 855 PL_tmps_max = 32;
442 856
443 New(54,PL_markstack,16,I32); 857 New(54,PL_markstack,16,I32);
444 PL_markstack_ptr = PL_markstack; 858 PL_markstack_ptr = PL_markstack;
445 PL_markstack_max = PL_markstack + 16; 859 PL_markstack_max = PL_markstack + 16;
446 860
447#ifdef SET_MARK_OFFSET 861#ifdef SET_MARK_OFFSET
448 SET_MARK_OFFSET; 862 SET_MARK_OFFSET;
449#endif 863#endif
450 864
451 New(54,PL_scopestack,16,I32); 865 New(54,PL_scopestack,8,I32);
452 PL_scopestack_ix = 0; 866 PL_scopestack_ix = 0;
453 PL_scopestack_max = 16; 867 PL_scopestack_max = 8;
454 868
455 New(54,PL_savestack,96,ANY); 869 New(54,PL_savestack,24,ANY);
456 PL_savestack_ix = 0; 870 PL_savestack_ix = 0;
457 PL_savestack_max = 96; 871 PL_savestack_max = 24;
458 872
459#if PERL_VERSION < 9 873#if !PERL_VERSION_ATLEAST (5,10,0)
460 New(54,PL_retstack,8,OP*); 874 New(54,PL_retstack,4,OP*);
461 PL_retstack_ix = 0; 875 PL_retstack_ix = 0;
462 PL_retstack_max = 8; 876 PL_retstack_max = 4;
463#endif 877#endif
464
465 UNLOCK;
466} 878}
879#endif
467 880
468/* 881/*
469 * destroy the stacks, the callchain etc... 882 * destroy the stacks, the callchain etc...
470 */ 883 */
471static void 884static void
472destroy_stacks(pTHX) 885coro_destruct_stacks (pTHX)
473{ 886{
474 if (!IN_DESTRUCT)
475 {
476 /* is this ugly, I ask? */
477 LEAVE_SCOPE (0);
478
479 /* sure it is, but more important: is it correct?? :/ */
480 FREETMPS;
481
482 /*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
483 }
484
485 while (PL_curstackinfo->si_next) 887 while (PL_curstackinfo->si_next)
486 PL_curstackinfo = PL_curstackinfo->si_next; 888 PL_curstackinfo = PL_curstackinfo->si_next;
487 889
488 while (PL_curstackinfo) 890 while (PL_curstackinfo)
489 { 891 {
490 PERL_SI *p = PL_curstackinfo->si_prev; 892 PERL_SI *p = PL_curstackinfo->si_prev;
491 893
492 { /*D*//*remove*/
493 dSP;
494 SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
495 PUTBACK; /* possibly superfluous */
496 }
497
498 if (!IN_DESTRUCT) 894 if (!IN_DESTRUCT)
499 {
500 dounwind (-1);/*D*//*remove*/
501 SvREFCNT_dec (PL_curstackinfo->si_stack); 895 SvREFCNT_dec (PL_curstackinfo->si_stack);
502 }
503 896
504 Safefree (PL_curstackinfo->si_cxstack); 897 Safefree (PL_curstackinfo->si_cxstack);
505 Safefree (PL_curstackinfo); 898 Safefree (PL_curstackinfo);
506 PL_curstackinfo = p; 899 PL_curstackinfo = p;
507 } 900 }
508 901
509 Safefree (PL_tmps_stack); 902 Safefree (PL_tmps_stack);
510 Safefree (PL_markstack); 903 Safefree (PL_markstack);
511 Safefree (PL_scopestack); 904 Safefree (PL_scopestack);
512 Safefree (PL_savestack); 905 Safefree (PL_savestack);
513#if PERL_VERSION < 9 906#if !PERL_VERSION_ATLEAST (5,10,0)
514 Safefree (PL_retstack); 907 Safefree (PL_retstack);
515#endif 908#endif
516} 909}
517 910
518static void 911#define CORO_RSS \
519allocate_stack (Coro__State ctx, int alloc) 912 rss += sizeof (SYM (curstackinfo)); \
520{ 913 rss += (SYM (curstackinfo->si_cxmax) + 1) * sizeof (PERL_CONTEXT); \
521 coro_stack *stack; 914 rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (SYM (curstack))) * sizeof (SV *); \
915 rss += SYM (tmps_max) * sizeof (SV *); \
916 rss += (SYM (markstack_max) - SYM (markstack_ptr)) * sizeof (I32); \
917 rss += SYM (scopestack_max) * sizeof (I32); \
918 rss += SYM (savestack_max) * sizeof (ANY);
522 919
523 New (0, stack, 1, coro_stack); 920static size_t
921coro_rss (pTHX_ struct coro *coro)
922{
923 size_t rss = sizeof (*coro);
524 924
525 stack->refcnt = 1; 925 if (coro->mainstack)
526 stack->usecnt = 1; 926 {
527 stack->gencnt = ctx->gencnt = 0; 927 if (coro->flags & CF_RUNNING)
528 928 {
529 if (alloc) 929 #define SYM(sym) PL_ ## sym
930 CORO_RSS;
931 #undef SYM
932 }
933 else
934 {
935 #define SYM(sym) coro->slot->sym
936 CORO_RSS;
937 #undef SYM
938 }
530 { 939 }
531#if HAVE_MMAP 940
532 stack->ssize = STACKSIZE * sizeof (long); /* mmap should do allocate-on-write for us */ 941 return rss;
533 stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0); 942}
534 if (stack->sptr == (void *)-1) 943
944/** coroutine stack handling ************************************************/
945
946static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
947static int (*orig_sigelem_set) (pTHX_ SV *sv, MAGIC *mg);
948static int (*orig_sigelem_clr) (pTHX_ SV *sv, MAGIC *mg);
949
950/* apparently < 5.8.8 */
951#ifndef MgPV_nolen_const
952#define MgPV_nolen_const(mg) (((((int)(mg)->mg_len)) == HEf_SVKEY) ? \
953 SvPV_nolen((SV*)((mg)->mg_ptr)) : \
954 (const char*)(mg)->mg_ptr)
535#endif 955#endif
956
957/*
958 * This overrides the default magic get method of %SIG elements.
959 * The original one doesn't provide for reading back of PL_diehook/PL_warnhook
960 * and instead of trying to save and restore the hash elements, we just provide
961 * readback here.
962 */
963static int
964coro_sigelem_get (pTHX_ SV *sv, MAGIC *mg)
965{
966 const char *s = MgPV_nolen_const (mg);
967
968 if (*s == '_')
969 {
970 SV **svp = 0;
971
972 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
973 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
974
975 if (svp)
536 { 976 {
537 stack->ssize = - (STACKSIZE * (long)sizeof (long)); 977 sv_setsv (sv, *svp ? *svp : &PL_sv_undef);
538 New (0, stack->sptr, STACKSIZE, long); 978 return 0;
539 } 979 }
540 } 980 }
541 else
542 stack->sptr = 0;
543 981
544 ctx->stack = stack; 982 return orig_sigelem_get ? orig_sigelem_get (aTHX_ sv, mg) : 0;
545} 983}
546 984
547static void 985static int
548deallocate_stack (Coro__State ctx) 986coro_sigelem_clr (pTHX_ SV *sv, MAGIC *mg)
549{ 987{
550 coro_stack *stack = ctx->stack; 988 const char *s = MgPV_nolen_const (mg);
551 989
552 ctx->stack = 0; 990 if (*s == '_')
553
554 if (stack)
555 { 991 {
556 if (!--stack->refcnt) 992 SV **svp = 0;
993
994 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
995 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
996
997 if (svp)
557 { 998 {
558#ifdef HAVE_MMAP 999 SV *old = *svp;
559 if (stack->ssize > 0 && stack->sptr) 1000 *svp = 0;
560 munmap (stack->sptr, stack->ssize); 1001 SvREFCNT_dec (old);
561 else 1002 return 0;
562#endif
563 Safefree (stack->sptr);
564
565 Safefree (stack);
566 } 1003 }
567 else if (ctx->gencnt == stack->gencnt) 1004 }
568 --stack->usecnt; 1005
1006 return orig_sigelem_clr ? orig_sigelem_clr (aTHX_ sv, mg) : 0;
1007}
1008
1009static int
1010coro_sigelem_set (pTHX_ SV *sv, MAGIC *mg)
1011{
1012 const char *s = MgPV_nolen_const (mg);
1013
1014 if (*s == '_')
569 } 1015 {
570} 1016 SV **svp = 0;
571 1017
1018 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
1019 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
1020
1021 if (svp)
1022 {
1023 SV *old = *svp;
1024 *svp = SvOK (sv) ? newSVsv (sv) : 0;
1025 SvREFCNT_dec (old);
1026 return 0;
1027 }
1028 }
1029
1030 return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
1031}
1032
1033static void
1034prepare_nop (pTHX_ struct coro_transfer_args *ta)
1035{
1036 /* kind of mega-hacky, but works */
1037 ta->next = ta->prev = (struct coro *)ta;
1038}
1039
572static void 1040static int
573setup_coro (void *arg) 1041slf_check_nop (pTHX_ struct CoroSLF *frame)
1042{
1043 return 0;
1044}
1045
1046static int
1047slf_check_repeat (pTHX_ struct CoroSLF *frame)
1048{
1049 return 1;
1050}
1051
1052static UNOP init_perl_op;
1053
1054static void NOINLINE /* noinline to keep it out of the transfer fast path */
1055init_perl (pTHX_ struct coro *coro)
574{ 1056{
575 /* 1057 /*
576 * emulate part of the perl startup here. 1058 * emulate part of the perl startup here.
577 */ 1059 */
1060 coro_init_stacks (aTHX);
1061
1062 PL_runops = RUNOPS_DEFAULT;
1063 PL_curcop = &PL_compiling;
1064 PL_in_eval = EVAL_NULL;
1065 PL_comppad = 0;
1066 PL_comppad_name = 0;
1067 PL_comppad_name_fill = 0;
1068 PL_comppad_name_floor = 0;
1069 PL_curpm = 0;
1070 PL_curpad = 0;
1071 PL_localizing = 0;
1072 PL_restartop = 0;
1073#if PERL_VERSION_ATLEAST (5,10,0)
1074 PL_parser = 0;
1075#endif
1076 PL_hints = 0;
1077
1078 /* recreate the die/warn hooks */
1079 PL_diehook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__DIE__" , sizeof ("__DIE__" ) - 1, 1), rv_diehook );
1080 PL_warnhook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__WARN__", sizeof ("__WARN__") - 1, 1), rv_warnhook);
1081
1082 GvSV (PL_defgv) = newSV (0);
1083 GvAV (PL_defgv) = coro->args; coro->args = 0;
1084 GvSV (PL_errgv) = newSV (0);
1085 GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
1086 GvHV (PL_hintgv) = 0;
1087 PL_rs = newSVsv (GvSV (irsgv));
1088 PL_defoutgv = (GV *)SvREFCNT_inc_NN (stdoutgv);
1089
1090 {
1091 dSP;
1092 UNOP myop;
1093
1094 Zero (&myop, 1, UNOP);
1095 myop.op_next = Nullop;
1096 myop.op_type = OP_ENTERSUB;
1097 myop.op_flags = OPf_WANT_VOID;
1098
1099 PUSHMARK (SP);
1100 PUSHs ((SV *)coro->startcv);
1101 PUTBACK;
1102 PL_op = (OP *)&myop;
1103 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
1104 }
1105
1106 /* this newly created coroutine might be run on an existing cctx which most
1107 * likely was suspended in pp_slf, so we have to emulate entering pp_slf here.
1108 */
1109 slf_frame.prepare = prepare_nop; /* provide a nop function for an eventual pp_slf */
1110 slf_frame.check = slf_check_nop; /* signal pp_slf to not repeat */
1111
1112 /* and we have to provide the pp_slf op in any case, so pp_slf can skip it */
1113 init_perl_op.op_next = PL_op;
1114 init_perl_op.op_type = OP_ENTERSUB;
1115 init_perl_op.op_ppaddr = pp_slf;
1116 /* no flags etc. required, as an init function won't be called */
1117
1118 PL_op = (OP *)&init_perl_op;
1119
1120 /* copy throw, in case it was set before init_perl */
1121 CORO_THROW = coro->except;
1122
1123 SWAP_SVS (coro);
1124
1125 if (expect_false (enable_times))
1126 {
1127 coro_times_update ();
1128 coro_times_sub (coro);
1129 }
1130}
1131
1132static void
1133coro_unwind_stacks (pTHX)
1134{
1135 if (!IN_DESTRUCT)
1136 {
1137 /* restore all saved variables and stuff */
1138 LEAVE_SCOPE (0);
1139 assert (PL_tmps_floor == -1);
1140
1141 /* free all temporaries */
1142 FREETMPS;
1143 assert (PL_tmps_ix == -1);
1144
1145 /* unwind all extra stacks */
1146 POPSTACK_TO (PL_mainstack);
1147
1148 /* unwind main stack */
1149 dounwind (-1);
1150 }
1151}
1152
1153static void
1154destroy_perl (pTHX_ struct coro *coro)
1155{
1156 SV *svf [9];
1157
1158 {
1159 SV *old_current = SvRV (coro_current);
1160 struct coro *current = SvSTATE (old_current);
1161
1162 assert (("FATAL: tried to destroy currently running coroutine", coro->mainstack != PL_mainstack));
1163
1164 save_perl (aTHX_ current);
1165
1166 /* this will cause transfer_check to croak on block*/
1167 SvRV_set (coro_current, (SV *)coro->hv);
1168
1169 load_perl (aTHX_ coro);
1170
1171 coro_unwind_stacks (aTHX);
1172 coro_destruct_stacks (aTHX);
1173
1174 /* restore swapped sv's */
1175 SWAP_SVS (coro);
1176
1177 // now save some sv's to be free'd later
1178 svf [0] = GvSV (PL_defgv);
1179 svf [1] = (SV *)GvAV (PL_defgv);
1180 svf [2] = GvSV (PL_errgv);
1181 svf [3] = (SV *)PL_defoutgv;
1182 svf [4] = PL_rs;
1183 svf [5] = GvSV (irsgv);
1184 svf [6] = (SV *)GvHV (PL_hintgv);
1185 svf [7] = PL_diehook;
1186 svf [8] = PL_warnhook;
1187 assert (9 == sizeof (svf) / sizeof (*svf));
1188
1189 SvRV_set (coro_current, old_current);
1190
1191 load_perl (aTHX_ current);
1192 }
1193
1194 {
1195 unsigned int i;
1196
1197 for (i = 0; i < sizeof (svf) / sizeof (*svf); ++i)
1198 SvREFCNT_dec (svf [i]);
1199
1200 SvREFCNT_dec (coro->saved_deffh);
1201 SvREFCNT_dec (coro->rouse_cb);
1202 SvREFCNT_dec (coro->invoke_cb);
1203 SvREFCNT_dec (coro->invoke_av);
1204 }
1205}
1206
1207INLINE void
1208free_coro_mortal (pTHX)
1209{
1210 if (expect_true (coro_mortal))
1211 {
1212 SvREFCNT_dec (coro_mortal);
1213 coro_mortal = 0;
1214 }
1215}
1216
1217static int
1218runops_trace (pTHX)
1219{
1220 COP *oldcop = 0;
1221 int oldcxix = -2;
1222
1223 while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
1224 {
1225 PERL_ASYNC_CHECK ();
1226
1227 if (cctx_current->flags & CC_TRACE_ALL)
1228 {
1229 if (PL_op->op_type == OP_LEAVESUB && cctx_current->flags & CC_TRACE_SUB)
1230 {
1231 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
1232 SV **bot, **top;
1233 AV *av = newAV (); /* return values */
1234 SV **cb;
1235 dSP;
1236
1237 GV *gv = CvGV (cx->blk_sub.cv);
1238 SV *fullname = sv_2mortal (newSV (0));
1239 if (isGV (gv))
1240 gv_efullname3 (fullname, gv, 0);
1241
1242 bot = PL_stack_base + cx->blk_oldsp + 1;
1243 top = cx->blk_gimme == G_ARRAY ? SP + 1
1244 : cx->blk_gimme == G_SCALAR ? bot + 1
1245 : bot;
1246
1247 av_extend (av, top - bot);
1248 while (bot < top)
1249 av_push (av, SvREFCNT_inc_NN (*bot++));
1250
1251 PL_runops = RUNOPS_DEFAULT;
1252 ENTER;
1253 SAVETMPS;
1254 EXTEND (SP, 3);
1255 PUSHMARK (SP);
1256 PUSHs (&PL_sv_no);
1257 PUSHs (fullname);
1258 PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
1259 PUTBACK;
1260 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
1261 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
1262 SPAGAIN;
1263 FREETMPS;
1264 LEAVE;
1265 PL_runops = runops_trace;
1266 }
1267
1268 if (oldcop != PL_curcop)
1269 {
1270 oldcop = PL_curcop;
1271
1272 if (PL_curcop != &PL_compiling)
1273 {
1274 SV **cb;
1275
1276 if (oldcxix != cxstack_ix && cctx_current->flags & CC_TRACE_SUB)
1277 {
1278 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
1279
1280 if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
1281 {
1282 dSP;
1283 GV *gv = CvGV (cx->blk_sub.cv);
1284 SV *fullname = sv_2mortal (newSV (0));
1285
1286 if (isGV (gv))
1287 gv_efullname3 (fullname, gv, 0);
1288
1289 PL_runops = RUNOPS_DEFAULT;
1290 ENTER;
1291 SAVETMPS;
1292 EXTEND (SP, 3);
1293 PUSHMARK (SP);
1294 PUSHs (&PL_sv_yes);
1295 PUSHs (fullname);
1296 PUSHs (CxHASARGS (cx) ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
1297 PUTBACK;
1298 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
1299 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
1300 SPAGAIN;
1301 FREETMPS;
1302 LEAVE;
1303 PL_runops = runops_trace;
1304 }
1305
1306 oldcxix = cxstack_ix;
1307 }
1308
1309 if (cctx_current->flags & CC_TRACE_LINE)
1310 {
1311 dSP;
1312
1313 PL_runops = RUNOPS_DEFAULT;
1314 ENTER;
1315 SAVETMPS;
1316 EXTEND (SP, 3);
1317 PL_runops = RUNOPS_DEFAULT;
1318 PUSHMARK (SP);
1319 PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
1320 PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
1321 PUTBACK;
1322 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
1323 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
1324 SPAGAIN;
1325 FREETMPS;
1326 LEAVE;
1327 PL_runops = runops_trace;
1328 }
1329 }
1330 }
1331 }
1332 }
1333
1334 TAINT_NOT;
1335 return 0;
1336}
1337
1338static struct CoroSLF cctx_ssl_frame;
1339
1340static void
1341slf_prepare_set_stacklevel (pTHX_ struct coro_transfer_args *ta)
1342{
1343 ta->prev = 0;
1344}
1345
1346static int
1347slf_check_set_stacklevel (pTHX_ struct CoroSLF *frame)
1348{
1349 *frame = cctx_ssl_frame;
1350
1351 return frame->check (aTHX_ frame); /* execute the restored frame - there must be one */
1352}
1353
1354/* initialises PL_top_env and injects a pseudo-slf-call to set the stacklevel */
1355static void NOINLINE
1356cctx_prepare (pTHX)
1357{
1358 PL_top_env = &PL_start_env;
1359
1360 if (cctx_current->flags & CC_TRACE)
1361 PL_runops = runops_trace;
1362
1363 /* we already must be executing an SLF op, there is no other valid way
1364 * that can lead to creation of a new cctx */
1365 assert (("FATAL: can't prepare slf-less cctx in Coro module (please report)",
1366 slf_frame.prepare && PL_op->op_ppaddr == pp_slf));
1367
1368 /* we must emulate leaving pp_slf, which is done inside slf_check_set_stacklevel */
1369 cctx_ssl_frame = slf_frame;
1370
1371 slf_frame.prepare = slf_prepare_set_stacklevel;
1372 slf_frame.check = slf_check_set_stacklevel;
1373}
1374
1375/* the tail of transfer: execute stuff we can only do after a transfer */
1376INLINE void
1377transfer_tail (pTHX)
1378{
1379 free_coro_mortal (aTHX);
1380}
1381
1382/*
1383 * this is a _very_ stripped down perl interpreter ;)
1384 */
1385static void
1386cctx_run (void *arg)
1387{
1388#ifdef USE_ITHREADS
1389# if CORO_PTHREAD
1390 PERL_SET_CONTEXT (coro_thx);
1391# endif
1392#endif
1393 {
1394 dTHX;
1395
1396 /* normally we would need to skip the entersub here */
1397 /* not doing so will re-execute it, which is exactly what we want */
1398 /* PL_nop = PL_nop->op_next */
1399
1400 /* inject a fake subroutine call to cctx_init */
1401 cctx_prepare (aTHX);
1402
1403 /* cctx_run is the alternative tail of transfer() */
1404 transfer_tail (aTHX);
1405
1406 /* somebody or something will hit me for both perl_run and PL_restartop */
1407 PL_restartop = PL_op;
1408 perl_run (PL_curinterp);
1409 /*
1410 * Unfortunately, there is no way to get at the return values of the
1411 * coro body here, as perl_run destroys these. Likewise, we cannot catch
1412 * runtime errors here, as this is just a random interpreter, not a thread.
1413 */
1414
1415 /*
1416 * If perl-run returns we assume exit() was being called or the coro
1417 * fell off the end, which seems to be the only valid (non-bug)
1418 * reason for perl_run to return. We try to exit by jumping to the
1419 * bootstrap-time "top" top_env, as we cannot restore the "main"
1420 * coroutine as Coro has no such concept.
1421 * This actually isn't valid with the pthread backend, but OSes requiring
1422 * that backend are too broken to do it in a standards-compliant way.
1423 */
1424 PL_top_env = main_top_env;
1425 JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
1426 }
1427}
1428
1429static coro_cctx *
1430cctx_new ()
1431{
1432 coro_cctx *cctx;
1433
1434 ++cctx_count;
1435 New (0, cctx, 1, coro_cctx);
1436
1437 cctx->gen = cctx_gen;
1438 cctx->flags = 0;
1439 cctx->idle_sp = 0; /* can be accessed by transfer between cctx_run and set_stacklevel, on throw */
1440
1441 return cctx;
1442}
1443
1444/* create a new cctx only suitable as source */
1445static coro_cctx *
1446cctx_new_empty ()
1447{
1448 coro_cctx *cctx = cctx_new ();
1449
1450 cctx->sptr = 0;
1451 coro_create (&cctx->cctx, 0, 0, 0, 0);
1452
1453 return cctx;
1454}
1455
1456/* create a new cctx suitable as destination/running a perl interpreter */
1457static coro_cctx *
1458cctx_new_run ()
1459{
1460 coro_cctx *cctx = cctx_new ();
1461 void *stack_start;
1462 size_t stack_size;
1463
1464#if HAVE_MMAP
1465 cctx->ssize = ((cctx_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
1466 /* mmap supposedly does allocate-on-write for us */
1467 cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
1468
1469 if (cctx->sptr != (void *)-1)
1470 {
1471 #if CORO_STACKGUARD
1472 mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
1473 #endif
1474 stack_start = (char *)cctx->sptr + CORO_STACKGUARD * PAGESIZE;
1475 stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
1476 cctx->flags |= CC_MAPPED;
1477 }
1478 else
1479#endif
1480 {
1481 cctx->ssize = cctx_stacksize * (long)sizeof (long);
1482 New (0, cctx->sptr, cctx_stacksize, long);
1483
1484 if (!cctx->sptr)
1485 {
1486 perror ("FATAL: unable to allocate stack for coroutine, exiting.");
1487 _exit (EXIT_FAILURE);
1488 }
1489
1490 stack_start = cctx->sptr;
1491 stack_size = cctx->ssize;
1492 }
1493
1494 #if CORO_USE_VALGRIND
1495 cctx->valgrind_id = VALGRIND_STACK_REGISTER ((char *)stack_start, (char *)stack_start + stack_size);
1496 #endif
1497
1498 coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);
1499
1500 return cctx;
1501}
1502
1503static void
1504cctx_destroy (coro_cctx *cctx)
1505{
1506 if (!cctx)
1507 return;
1508
1509 assert (("FATAL: tried to destroy current cctx", cctx != cctx_current));
1510
1511 --cctx_count;
1512 coro_destroy (&cctx->cctx);
1513
1514 /* coro_transfer creates new, empty cctx's */
1515 if (cctx->sptr)
1516 {
1517 #if CORO_USE_VALGRIND
1518 VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
1519 #endif
1520
1521#if HAVE_MMAP
1522 if (cctx->flags & CC_MAPPED)
1523 munmap (cctx->sptr, cctx->ssize);
1524 else
1525#endif
1526 Safefree (cctx->sptr);
1527 }
1528
1529 Safefree (cctx);
1530}
1531
1532/* wether this cctx should be destructed */
1533#define CCTX_EXPIRED(cctx) ((cctx)->gen != cctx_gen || ((cctx)->flags & CC_NOREUSE))
1534
1535static coro_cctx *
1536cctx_get (pTHX)
1537{
1538 while (expect_true (cctx_first))
1539 {
1540 coro_cctx *cctx = cctx_first;
1541 cctx_first = cctx->next;
1542 --cctx_idle;
1543
1544 if (expect_true (!CCTX_EXPIRED (cctx)))
1545 return cctx;
1546
1547 cctx_destroy (cctx);
1548 }
1549
1550 return cctx_new_run ();
1551}
1552
1553static void
1554cctx_put (coro_cctx *cctx)
1555{
1556 assert (("FATAL: cctx_put called on non-initialised cctx in Coro (please report)", cctx->sptr));
1557
1558 /* free another cctx if overlimit */
1559 if (expect_false (cctx_idle >= cctx_max_idle))
1560 {
1561 coro_cctx *first = cctx_first;
1562 cctx_first = first->next;
1563 --cctx_idle;
1564
1565 cctx_destroy (first);
1566 }
1567
1568 ++cctx_idle;
1569 cctx->next = cctx_first;
1570 cctx_first = cctx;
1571}
1572
1573/** coroutine switching *****************************************************/
1574
1575static void
1576transfer_check (pTHX_ struct coro *prev, struct coro *next)
1577{
1578 /* TODO: throwing up here is considered harmful */
1579
1580 if (expect_true (prev != next))
1581 {
1582 if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
1583 croak ("Coro::State::transfer called with a blocked prev Coro::State, but can only transfer from running or new states,");
1584
1585 if (expect_false (next->flags & (CF_RUNNING | CF_DESTROYED | CF_SUSPENDED)))
1586 croak ("Coro::State::transfer called with running, destroyed or suspended next Coro::State, but can only transfer to inactive states,");
1587
1588#if !PERL_VERSION_ATLEAST (5,10,0)
1589 if (expect_false (PL_lex_state != LEX_NOTPARSING))
1590 croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version,");
1591#endif
1592 }
1593}
1594
1595/* always use the TRANSFER macro */
1596static void NOINLINE /* noinline so we have a fixed stackframe */
1597transfer (pTHX_ struct coro *prev, struct coro *next, int force_cctx)
1598{
1599 dSTACKLEVEL;
1600
1601 /* sometimes transfer is only called to set idle_sp */
1602 if (expect_false (!prev))
1603 {
1604 cctx_current->idle_sp = STACKLEVEL;
1605 assert (cctx_current->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
1606 }
1607 else if (expect_true (prev != next))
1608 {
1609 coro_cctx *cctx_prev;
1610
1611 if (expect_false (prev->flags & CF_NEW))
1612 {
1613 /* create a new empty/source context */
1614 prev->flags &= ~CF_NEW;
1615 prev->flags |= CF_RUNNING;
1616 }
1617
1618 prev->flags &= ~CF_RUNNING;
1619 next->flags |= CF_RUNNING;
1620
1621 /* first get rid of the old state */
1622 save_perl (aTHX_ prev);
1623
1624 if (expect_false (next->flags & CF_NEW))
1625 {
1626 /* need to start coroutine */
1627 next->flags &= ~CF_NEW;
1628 /* setup coroutine call */
1629 init_perl (aTHX_ next);
1630 }
1631 else
1632 load_perl (aTHX_ next);
1633
1634 /* possibly untie and reuse the cctx */
1635 if (expect_true (
1636 cctx_current->idle_sp == STACKLEVEL
1637 && !(cctx_current->flags & CC_TRACE)
1638 && !force_cctx
1639 ))
1640 {
1641 /* I assume that stacklevel is a stronger indicator than PL_top_env changes */
1642 assert (("FATAL: current top_env must equal previous top_env in Coro (please report)", PL_top_env == cctx_current->idle_te));
1643
1644 /* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get. */
1645 /* without this the next cctx_get might destroy the running cctx while still in use */
1646 if (expect_false (CCTX_EXPIRED (cctx_current)))
1647 if (expect_true (!next->cctx))
1648 next->cctx = cctx_get (aTHX);
1649
1650 cctx_put (cctx_current);
1651 }
1652 else
1653 prev->cctx = cctx_current;
1654
1655 ++next->usecount;
1656
1657 cctx_prev = cctx_current;
1658 cctx_current = expect_false (next->cctx) ? next->cctx : cctx_get (aTHX);
1659
1660 next->cctx = 0;
1661
1662 if (expect_false (cctx_prev != cctx_current))
1663 {
1664 cctx_prev->top_env = PL_top_env;
1665 PL_top_env = cctx_current->top_env;
1666 coro_transfer (&cctx_prev->cctx, &cctx_current->cctx);
1667 }
1668
1669 transfer_tail (aTHX);
1670 }
1671}
1672
1673#define TRANSFER(ta, force_cctx) transfer (aTHX_ (ta).prev, (ta).next, (force_cctx))
1674#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
1675
1676/** high level stuff ********************************************************/
1677
1678static void
1679coro_state_destroy (pTHX_ struct coro *coro)
1680{
1681 if (coro->flags & CF_DESTROYED)
1682 return;
1683
1684 slf_destroy (aTHX_ coro);
1685
1686 coro->flags |= CF_DESTROYED;
1687
1688 if (coro->flags & CF_READY)
1689 {
1690 /* reduce nready, as destroying a ready coro effectively unreadies it */
1691 /* alternative: look through all ready queues and remove the coro */
1692 --coro_nready;
1693 }
1694 else
1695 coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
1696
1697 if (coro->mainstack
1698 && coro->mainstack != main_mainstack
1699 && coro->slot
1700 && !PL_dirty)
1701 destroy_perl (aTHX_ coro);
1702
1703 if (coro->next) coro->next->prev = coro->prev;
1704 if (coro->prev) coro->prev->next = coro->next;
1705 if (coro == coro_first) coro_first = coro->next;
1706
1707 cctx_destroy (coro->cctx);
1708 SvREFCNT_dec (coro->startcv);
1709 SvREFCNT_dec (coro->args);
1710 SvREFCNT_dec (coro->swap_sv);
1711 SvREFCNT_dec (CORO_THROW);
1712}
1713
1714static int
1715coro_state_free (pTHX_ SV *sv, MAGIC *mg)
1716{
1717 struct coro *coro = (struct coro *)mg->mg_ptr;
1718 mg->mg_ptr = 0;
1719
1720 coro->hv = 0;
1721
1722 if (--coro->refcnt < 0)
1723 {
1724 coro_state_destroy (aTHX_ coro);
1725 Safefree (coro);
1726 }
1727
1728 return 0;
1729}
1730
1731static int
1732coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
1733{
1734 struct coro *coro = (struct coro *)mg->mg_ptr;
1735
1736 ++coro->refcnt;
1737
1738 return 0;
1739}
1740
1741static MGVTBL coro_state_vtbl = {
1742 0, 0, 0, 0,
1743 coro_state_free,
1744 0,
1745#ifdef MGf_DUP
1746 coro_state_dup,
1747#else
1748# define MGf_DUP 0
1749#endif
1750};
1751
1752static void
1753prepare_transfer (pTHX_ struct coro_transfer_args *ta, SV *prev_sv, SV *next_sv)
1754{
1755 ta->prev = SvSTATE (prev_sv);
1756 ta->next = SvSTATE (next_sv);
1757 TRANSFER_CHECK (*ta);
1758}
1759
1760static void
1761api_transfer (pTHX_ SV *prev_sv, SV *next_sv)
1762{
1763 struct coro_transfer_args ta;
1764
1765 prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
1766 TRANSFER (ta, 1);
1767}
1768
1769/** Coro ********************************************************************/
1770
1771INLINE void
1772coro_enq (pTHX_ struct coro *coro)
1773{
1774 struct coro **ready = coro_ready [coro->prio - CORO_PRIO_MIN];
1775
1776 SvREFCNT_inc_NN (coro->hv);
1777
1778 coro->next_ready = 0;
1779 *(ready [0] ? &ready [1]->next_ready : &ready [0]) = coro;
1780 ready [1] = coro;
1781}
1782
1783INLINE struct coro *
1784coro_deq (pTHX)
1785{
1786 int prio;
1787
1788 for (prio = CORO_PRIO_MAX - CORO_PRIO_MIN + 1; --prio >= 0; )
1789 {
1790 struct coro **ready = coro_ready [prio];
1791
1792 if (ready [0])
1793 {
1794 struct coro *coro = ready [0];
1795 ready [0] = coro->next_ready;
1796 return coro;
1797 }
1798 }
1799
1800 return 0;
1801}
1802
1803static void
1804invoke_sv_ready_hook_helper (void)
1805{
578 dTHX; 1806 dTHX;
579 dSP; 1807 dSP;
580 Coro__State ctx = (Coro__State)arg;
581 SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
582 1808
583 coro_init_stacks (aTHX); 1809 ENTER;
584 /*PL_curcop = 0;*/ 1810 SAVETMPS;
585 /*PL_in_eval = PL_in_eval;*/ /* inherit */
586 SvREFCNT_dec (GvAV (PL_defgv));
587 GvAV (PL_defgv) = ctx->args; ctx->args = 0;
588 1811
589 SPAGAIN;
590
591 if (ctx->stack)
592 {
593 ctx->cursp = 0;
594
595 PUSHMARK(SP); 1812 PUSHMARK (SP);
596 PUTBACK; 1813 PUTBACK;
597 (void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL); 1814 call_sv (coro_readyhook, G_VOID | G_DISCARD);
598 1815
599 if (SvTRUE (ERRSV)) 1816 FREETMPS;
600 croak (NULL); 1817 LEAVE;
601 else 1818}
602 croak ("FATAL: CCTXT coroutine returned!"); 1819
1820static int
1821api_ready (pTHX_ SV *coro_sv)
1822{
1823 struct coro *coro = SvSTATE (coro_sv);
1824
1825 if (coro->flags & CF_READY)
1826 return 0;
1827
1828 coro->flags |= CF_READY;
1829
1830 coro_enq (aTHX_ coro);
1831
1832 if (!coro_nready++)
1833 if (coroapi.readyhook)
1834 coroapi.readyhook ();
1835
1836 return 1;
1837}
1838
1839static int
1840api_is_ready (pTHX_ SV *coro_sv)
1841{
1842 return !!(SvSTATE (coro_sv)->flags & CF_READY);
1843}
1844
1845/* expects to own a reference to next->hv */
1846INLINE void
1847prepare_schedule_to (pTHX_ struct coro_transfer_args *ta, struct coro *next)
1848{
1849 SV *prev_sv = SvRV (coro_current);
1850
1851 ta->prev = SvSTATE_hv (prev_sv);
1852 ta->next = next;
1853
1854 TRANSFER_CHECK (*ta);
1855
1856 SvRV_set (coro_current, (SV *)next->hv);
1857
1858 free_coro_mortal (aTHX);
1859 coro_mortal = prev_sv;
1860}
1861
1862static void
1863prepare_schedule (pTHX_ struct coro_transfer_args *ta)
1864{
1865 for (;;)
603 } 1866 {
604 else 1867 struct coro *next = coro_deq (aTHX);
605 {
606 UNOP myop;
607 1868
608 PL_op = (OP *)&myop; 1869 if (expect_true (next))
609
610 Zero(&myop, 1, UNOP);
611 myop.op_next = Nullop;
612 myop.op_flags = OPf_WANT_VOID;
613
614 PUSHMARK(SP);
615 XPUSHs (sub_init);
616 /*
617 * the next line is slightly wrong, as PL_op->op_next
618 * is actually being executed so we skip the first op.
619 * that doesn't matter, though, since it is only
620 * pp_nextstate and we never return...
621 * ah yes, and I don't care anyways ;)
622 */
623 PUTBACK;
624 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
625 SPAGAIN;
626
627 ENTER; /* necessary e.g. for dounwind */
628 }
629}
630
631static void
632continue_coro (void *arg)
633{
634 /*
635 * this is a _very_ stripped down perl interpreter ;)
636 */
637 dTHX;
638 Coro__State ctx = (Coro__State)arg;
639
640 PL_top_env = &ctx->start_env;
641
642 ctx->cursp = 0;
643 PL_op = PL_op->op_next;
644 CALLRUNOPS(aTHX);
645
646 abort ();
647}
648
649static void
650transfer (pTHX_ struct coro *prev, struct coro *next, int flags)
651{
652 dSTACKLEVEL;
653
654 if (prev != next)
655 {
656 if (next->mainstack)
657 { 1870 {
658 LOCK; 1871 /* cannot transfer to destroyed coros, skip and look for next */
659 SAVE (prev, flags); 1872 if (expect_false (next->flags & (CF_DESTROYED | CF_SUSPENDED)))
660 LOAD (next); 1873 SvREFCNT_dec (next->hv); /* coro_nready has already been taken care of by destroy */
661 UNLOCK; 1874 else
662
663 /* mark this state as in-use */
664 next->mainstack = 0;
665 next->tmps_ix = -2;
666
667 /* stacklevel changed? if yes, grab the stack for us! */
668 if (flags & TRANSFER_SAVE_CCTXT)
669 { 1875 {
670 if (!prev->stack) 1876 next->flags &= ~CF_READY;
671 allocate_stack (prev, 0); 1877 --coro_nready;
672 else if (prev->cursp != stacklevel 1878
673 && prev->stack->usecnt > 1) 1879 prepare_schedule_to (aTHX_ ta, next);
674 { 1880 break;
675 prev->gencnt = ++prev->stack->gencnt;
676 prev->stack->usecnt = 1;
677 }
678
679 /* has our stack been invalidated? */
680 if (next->stack && next->stack->gencnt != next->gencnt)
681 {
682 deallocate_stack (next);
683 allocate_stack (next, 1);
684 coro_create (&(next->stack->cctx),
685 continue_coro, (void *)next,
686 next->stack->sptr, labs (next->stack->ssize));
687 }
688
689 coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
690 prev->cursp = stacklevel;
691 /* don't add any code here */
692 } 1881 }
693 else
694 next->cursp = stacklevel;
695 } 1882 }
696 else if (next->tmps_ix == -2)
697 croak ("tried to transfer to running coroutine");
698 else 1883 else
699 { 1884 {
700 LOCK; 1885 /* nothing to schedule: call the idle handler */
701 SAVE (prev, -1); /* first get rid of the old state */ 1886 if (SvROK (sv_idle)
702 UNLOCK; 1887 && SvOBJECT (SvRV (sv_idle)))
703
704 if (flags & TRANSFER_SAVE_CCTXT)
705 { 1888 {
706 if (!prev->stack) 1889 if (SvRV (sv_idle) == SvRV (coro_current))
707 allocate_stack (prev, 0); 1890 croak ("FATAL: $Coro::IDLE blocked itself - did you try to block inside an event loop callback? Caught");
708 1891
709 if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK) 1892 ++coro_nready; /* hack so that api_ready doesn't invoke ready hook */
710 { 1893 api_ready (aTHX_ SvRV (sv_idle));
711 PL_top_env = &next->start_env; 1894 --coro_nready;
712
713 setup_coro (next);
714 next->cursp = stacklevel;
715
716 prev->stack->refcnt++;
717 prev->stack->usecnt++;
718 next->stack = prev->stack;
719 next->gencnt = prev->gencnt;
720 }
721 else
722 {
723 assert (!next->stack);
724 allocate_stack (next, 1);
725 coro_create (&(next->stack->cctx),
726 setup_coro, (void *)next,
727 next->stack->sptr, labs (next->stack->ssize));
728 coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
729 prev->cursp = stacklevel;
730 /* don't add any code here */
731 }
732 } 1895 }
733 else 1896 else
734 { 1897 {
735 setup_coro (next); 1898 /* TODO: deprecated, remove, cannot work reliably *//*D*/
736 next->cursp = stacklevel; 1899 dSP;
1900
1901 ENTER;
1902 SAVETMPS;
1903
1904 PUSHMARK (SP);
1905 PUTBACK;
1906 call_sv (sv_idle, G_VOID | G_DISCARD);
1907
1908 FREETMPS;
1909 LEAVE;
737 } 1910 }
738 } 1911 }
739 } 1912 }
1913}
740 1914
741 LOCK; 1915INLINE void
1916prepare_cede (pTHX_ struct coro_transfer_args *ta)
1917{
1918 api_ready (aTHX_ coro_current);
1919 prepare_schedule (aTHX_ ta);
1920}
1921
1922INLINE void
1923prepare_cede_notself (pTHX_ struct coro_transfer_args *ta)
1924{
1925 SV *prev = SvRV (coro_current);
1926
742 if (coro_mortal) 1927 if (coro_nready)
743 {
744 SvREFCNT_dec (coro_mortal);
745 coro_mortal = 0;
746 } 1928 {
747 UNLOCK; 1929 prepare_schedule (aTHX_ ta);
1930 api_ready (aTHX_ prev);
1931 }
1932 else
1933 prepare_nop (aTHX_ ta);
748} 1934}
749 1935
750#define SV_CORO(sv,func) \ 1936static void
751 do { \ 1937api_schedule (pTHX)
752 if (SvROK (sv)) \ 1938{
753 sv = SvRV (sv); \ 1939 struct coro_transfer_args ta;
754 \
755 if (SvTYPE (sv) == SVt_PVHV) \
756 { \
757 HE *he = hv_fetch_ent ((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
758 \
759 if (!he) \
760 croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
761 \
762 (sv) = SvRV (HeVAL(he)); \
763 } \
764 \
765 /* must also be changed inside Coro::Cont::yield */ \
766 if (!SvOBJECT (sv) || SvSTASH (sv) != coro_state_stash) \
767 croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
768 \
769 } while(0)
770 1940
771#define SvSTATE(sv) INT2PTR (struct coro *, SvIV (sv)) 1941 prepare_schedule (aTHX_ &ta);
1942 TRANSFER (ta, 1);
1943}
772 1944
1945static void
1946api_schedule_to (pTHX_ SV *coro_sv)
1947{
1948 struct coro_transfer_args ta;
1949 struct coro *next = SvSTATE (coro_sv);
1950
1951 SvREFCNT_inc_NN (coro_sv);
1952 prepare_schedule_to (aTHX_ &ta, next);
1953}
1954
773static void 1955static int
774api_transfer(pTHX_ SV *prev, SV *next, int flags) 1956api_cede (pTHX)
775{ 1957{
776 SV_CORO (prev, "Coro::transfer"); 1958 struct coro_transfer_args ta;
777 SV_CORO (next, "Coro::transfer");
778 1959
779 transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags); 1960 prepare_cede (aTHX_ &ta);
780}
781 1961
1962 if (expect_true (ta.prev != ta.next))
1963 {
1964 TRANSFER (ta, 1);
1965 return 1;
1966 }
1967 else
1968 return 0;
1969}
1970
1971static int
1972api_cede_notself (pTHX)
1973{
1974 if (coro_nready)
1975 {
1976 struct coro_transfer_args ta;
1977
1978 prepare_cede_notself (aTHX_ &ta);
1979 TRANSFER (ta, 1);
1980 return 1;
1981 }
1982 else
1983 return 0;
1984}
1985
1986static void
1987api_trace (pTHX_ SV *coro_sv, int flags)
1988{
1989 struct coro *coro = SvSTATE (coro_sv);
1990
1991 if (coro->flags & CF_RUNNING)
1992 croak ("cannot enable tracing on a running coroutine, caught");
1993
1994 if (flags & CC_TRACE)
1995 {
1996 if (!coro->cctx)
1997 coro->cctx = cctx_new_run ();
1998 else if (!(coro->cctx->flags & CC_TRACE))
1999 croak ("cannot enable tracing on coroutine with custom stack, caught");
2000
2001 coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
2002 }
2003 else if (coro->cctx && coro->cctx->flags & CC_TRACE)
2004 {
2005 coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
2006
2007 if (coro->flags & CF_RUNNING)
2008 PL_runops = RUNOPS_DEFAULT;
2009 else
2010 coro->slot->runops = RUNOPS_DEFAULT;
2011 }
2012}
2013
2014static void
2015coro_call_on_destroy (pTHX_ struct coro *coro)
2016{
2017 SV **on_destroyp = hv_fetch (coro->hv, "_on_destroy", sizeof ("_on_destroy") - 1, 0);
2018
2019 if (on_destroyp)
2020 {
2021 SV **statusp = hv_fetch (coro->hv, "_status", sizeof ("_status") - 1, 0);
2022 AV *on_destroy = sv_2mortal (SvREFCNT_inc ((AV *)SvRV (*on_destroyp)));
2023 AV *status = statusp ? sv_2mortal (SvREFCNT_inc ((AV *)SvRV (*statusp))) : 0;
2024
2025 while (AvFILLp (on_destroy) >= 0)
2026 {
2027 dSP; /* don't disturb outer sp */
2028 SV *cb = av_pop (on_destroy);
2029
2030 PUSHMARK (SP);
2031
2032 if (statusp)
2033 {
2034 int i;
2035 EXTEND (SP, AvFILLp (status) + 1);
2036
2037 for (i = 0; i <= AvFILLp (status); ++i)
2038 PUSHs (AvARRAY (status)[i]);
2039 }
2040
2041 PUTBACK;
2042 call_sv (sv_2mortal (cb), G_VOID | G_DISCARD);
2043 }
2044 }
2045}
2046
2047static void
2048coro_set_status (HV *coro_hv, SV **arg, int items)
2049{
2050 AV *av = newAV ();
2051
2052 /* items are actually not so common, so optimise for this case */
2053 if (items)
2054 {
2055 int i;
2056
2057 av_extend (av, items - 1);
2058
2059 for (i = 0; i < items; ++i)
2060 av_push (av, SvREFCNT_inc_NN (arg [i]));
2061 }
2062
2063 hv_store (coro_hv, "_status", sizeof ("_status") - 1, newRV_noinc ((SV *)av), 0);
2064}
2065
2066static void
2067slf_init_terminate_cancel_common (pTHX_ struct CoroSLF *frame, HV *coro_hv)
2068{
2069 av_push (av_destroy, (SV *)newRV_inc ((SV *)coro_hv)); /* RVinc for perl */
2070 api_ready (aTHX_ sv_manager);
2071
2072 frame->prepare = prepare_schedule;
2073 frame->check = slf_check_repeat;
2074
2075 /* as a minor optimisation, we could unwind all stacks here */
2076 /* but that puts extra pressure on pp_slf, and is not worth much */
2077 /*coro_unwind_stacks (aTHX);*/
2078}
2079
2080static void
2081slf_init_terminate (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2082{
2083 HV *coro_hv = (HV *)SvRV (coro_current);
2084
2085 coro_set_status (coro_hv, arg, items);
2086 slf_init_terminate_cancel_common (frame, coro_hv);
2087}
2088
2089static void
2090slf_init_cancel (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2091{
2092 HV *coro_hv;
2093 struct coro *coro;
2094
2095 if (items <= 0)
2096 croak ("Coro::cancel called without coro object,");
2097
2098 coro = SvSTATE (arg [0]);
2099 coro_hv = coro->hv;
2100
2101 coro_set_status (coro_hv, arg + 1, items - 1);
2102
2103 if (expect_false (coro->flags & CF_NOCANCEL))
2104 {
2105 /* coro currently busy cancelling something, so just notify it */
2106 coro->slf_frame.data = (void *)coro;
2107
2108 frame->prepare = prepare_nop;
2109 frame->check = slf_check_nop;
2110 }
2111 else if (coro_hv == (HV *)SvRV (coro_current))
2112 {
2113 /* cancelling the current coro is allowed, and equals terminate */
2114 slf_init_terminate_cancel_common (frame, coro_hv);
2115 }
2116 else
2117 {
2118 struct coro *self = SvSTATE_current;
2119
2120 /* otherwise we cancel directly, purely for speed reasons
2121 * unfortunately, this requires some magic trickery, as
2122 * somebody else could cancel us, so we have to fight the cancellation.
2123 * this is ugly, and hopefully fully worth the extra speed.
2124 * besides, I can't get the slow-but-safe version working...
2125 */
2126 slf_frame.data = 0;
2127 self->flags |= CF_NOCANCEL;
2128
2129 coro_state_destroy (aTHX_ coro);
2130 coro_call_on_destroy (aTHX_ coro);
2131
2132 self->flags &= ~CF_NOCANCEL;
2133
2134 if (slf_frame.data)
2135 {
2136 /* while we were busy we have been cancelled, so terminate */
2137 slf_init_terminate_cancel_common (frame, self->hv);
2138 }
2139 else
2140 {
2141 frame->prepare = prepare_nop;
2142 frame->check = slf_check_nop;
2143 }
2144 }
2145}
2146
2147static int
2148slf_check_safe_cancel (pTHX_ struct CoroSLF *frame)
2149{
2150 frame->prepare = 0;
2151 coro_unwind_stacks ();
2152
2153 slf_init_terminate_cancel_common (aTHX_ frame, (HV *)SvRV (coro_current));
2154
2155 return 1;
2156}
2157
2158static int
2159safe_cancel (pTHX_ struct coro *coro, SV **arg, int items)
2160{
2161 if (coro->cctx)
2162 croak ("coro inside C callback, unable to cancel at this time, caught");
2163
2164 if (coro->flags & CF_NEW)
2165 {
2166 coro_set_status (coro->hv, arg, items);
2167 coro_state_destroy (aTHX_ coro);
2168 coro_call_on_destroy (aTHX_ coro);
2169 }
2170 else
2171 {
2172 if (!coro->slf_frame.prepare)
2173 croak ("coro outside an SLF function, unable to cancel at this time, caught");
2174
2175 slf_destroy (coro);
2176
2177 coro_set_status (coro->hv, arg, items);
2178 coro->slf_frame.prepare = prepare_nop;
2179 coro->slf_frame.check = slf_check_safe_cancel;
2180
2181 api_ready (aTHX_ coro->hv);
2182 }
2183
2184 return 1;
2185}
2186
782/** Coro ********************************************************************/ 2187/*****************************************************************************/
2188/* async pool handler */
783 2189
784#define PRIO_MAX 3
785#define PRIO_HIGH 1
786#define PRIO_NORMAL 0
787#define PRIO_LOW -1
788#define PRIO_IDLE -3
789#define PRIO_MIN -4
790
791/* for Coro.pm */
792static GV *coro_current, *coro_idle;
793static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];
794static int coro_nready;
795
796static void 2190static int
797coro_enq (pTHX_ SV *sv) 2191slf_check_pool_handler (pTHX_ struct CoroSLF *frame)
798{ 2192{
799 SV **xprio; 2193 HV *hv = (HV *)SvRV (coro_current);
800 int prio; 2194 struct coro *coro = (struct coro *)frame->data;
801 2195
2196 if (!coro->invoke_cb)
2197 return 1; /* loop till we have invoke */
2198 else
2199 {
2200 hv_store (hv, "desc", sizeof ("desc") - 1,
2201 newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
2202
2203 coro->saved_deffh = SvREFCNT_inc_NN ((SV *)PL_defoutgv);
2204
2205 {
2206 dSP;
2207 XPUSHs (sv_2mortal (coro->invoke_cb)); coro->invoke_cb = 0;
2208 PUTBACK;
2209 }
2210
2211 SvREFCNT_dec (GvAV (PL_defgv));
2212 GvAV (PL_defgv) = coro->invoke_av;
2213 coro->invoke_av = 0;
2214
2215 return 0;
2216 }
2217}
2218
2219static void
2220slf_init_pool_handler (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2221{
2222 HV *hv = (HV *)SvRV (coro_current);
2223 struct coro *coro = SvSTATE_hv ((SV *)hv);
2224
2225 if (expect_true (coro->saved_deffh))
2226 {
2227 /* subsequent iteration */
2228 SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
2229 coro->saved_deffh = 0;
2230
2231 if (coro_rss (aTHX_ coro) > SvUV (sv_pool_rss)
2232 || av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
2233 {
2234 slf_init_terminate_cancel_common (aTHX_ frame, hv);
2235 return;
2236 }
2237 else
2238 {
2239 av_clear (GvAV (PL_defgv));
2240 hv_store (hv, "desc", sizeof ("desc") - 1, SvREFCNT_inc_NN (sv_async_pool_idle), 0);
2241
2242 coro->prio = 0;
2243
2244 if (coro->cctx && (coro->cctx->flags & CC_TRACE))
2245 api_trace (aTHX_ coro_current, 0);
2246
2247 frame->prepare = prepare_schedule;
2248 av_push (av_async_pool, SvREFCNT_inc (hv));
2249 }
2250 }
2251 else
2252 {
2253 /* first iteration, simply fall through */
2254 frame->prepare = prepare_nop;
2255 }
2256
2257 frame->check = slf_check_pool_handler;
2258 frame->data = (void *)coro;
2259}
2260
2261/*****************************************************************************/
2262/* rouse callback */
2263
2264#define CORO_MAGIC_type_rouse PERL_MAGIC_ext
2265
2266static void
2267coro_rouse_callback (pTHX_ CV *cv)
2268{
2269 dXSARGS;
2270 SV *data = (SV *)S_GENSUB_ARG;
2271
802 if (SvTYPE (sv) != SVt_PVHV) 2272 if (SvTYPE (SvRV (data)) != SVt_PVAV)
803 croak ("Coro::ready tried to enqueue something that is not a coroutine"); 2273 {
2274 /* first call, set args */
2275 SV *coro = SvRV (data);
2276 AV *av = newAV ();
804 2277
805 xprio = hv_fetch ((HV *)sv, "prio", 4, 0); 2278 SvRV_set (data, (SV *)av);
806 prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
807 2279
808 prio = prio > PRIO_MAX ? PRIO_MAX 2280 /* better take a full copy of the arguments */
809 : prio < PRIO_MIN ? PRIO_MIN 2281 while (items--)
810 : prio; 2282 av_store (av, items, newSVsv (ST (items)));
811 2283
812 av_push (coro_ready [prio - PRIO_MIN], sv); 2284 api_ready (aTHX_ coro);
813 coro_nready++; 2285 SvREFCNT_dec (coro);
2286 }
2287
2288 XSRETURN_EMPTY;
2289}
2290
2291static int
2292slf_check_rouse_wait (pTHX_ struct CoroSLF *frame)
2293{
2294 SV *data = (SV *)frame->data;
2295
2296 if (CORO_THROW)
2297 return 0;
2298
2299 if (SvTYPE (SvRV (data)) != SVt_PVAV)
2300 return 1;
2301
2302 /* now push all results on the stack */
2303 {
2304 dSP;
2305 AV *av = (AV *)SvRV (data);
2306 int i;
2307
2308 EXTEND (SP, AvFILLp (av) + 1);
2309 for (i = 0; i <= AvFILLp (av); ++i)
2310 PUSHs (sv_2mortal (AvARRAY (av)[i]));
2311
2312 /* we have stolen the elements, so set length to zero and free */
2313 AvFILLp (av) = -1;
2314 av_undef (av);
2315
2316 PUTBACK;
2317 }
2318
2319 return 0;
2320}
2321
2322static void
2323slf_init_rouse_wait (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2324{
2325 SV *cb;
2326
2327 if (items)
2328 cb = arg [0];
2329 else
2330 {
2331 struct coro *coro = SvSTATE_current;
2332
2333 if (!coro->rouse_cb)
2334 croak ("Coro::rouse_wait called without rouse callback, and no default rouse callback found either,");
2335
2336 cb = sv_2mortal (coro->rouse_cb);
2337 coro->rouse_cb = 0;
2338 }
2339
2340 if (!SvROK (cb)
2341 || SvTYPE (SvRV (cb)) != SVt_PVCV
2342 || CvXSUB ((CV *)SvRV (cb)) != coro_rouse_callback)
2343 croak ("Coro::rouse_wait called with illegal callback argument,");
2344
2345 {
2346 CV *cv = (CV *)SvRV (cb); /* for S_GENSUB_ARG */
2347 SV *data = (SV *)S_GENSUB_ARG;
2348
2349 frame->data = (void *)data;
2350 frame->prepare = SvTYPE (SvRV (data)) == SVt_PVAV ? prepare_nop : prepare_schedule;
2351 frame->check = slf_check_rouse_wait;
2352 }
814} 2353}
815 2354
816static SV * 2355static SV *
817coro_deq (pTHX_ int min_prio) 2356coro_new_rouse_cb (pTHX)
818{ 2357{
819 int prio = PRIO_MAX - PRIO_MIN; 2358 HV *hv = (HV *)SvRV (coro_current);
2359 struct coro *coro = SvSTATE_hv (hv);
2360 SV *data = newRV_inc ((SV *)hv);
2361 SV *cb = s_gensub (aTHX_ coro_rouse_callback, (void *)data);
820 2362
821 min_prio -= PRIO_MIN; 2363 sv_magicext (SvRV (cb), data, CORO_MAGIC_type_rouse, 0, 0, 0);
822 if (min_prio < 0) 2364 SvREFCNT_dec (data); /* magicext increases the refcount */
823 min_prio = 0;
824 2365
825 for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; ) 2366 SvREFCNT_dec (coro->rouse_cb);
826 if (av_len (coro_ready[prio]) >= 0) 2367 coro->rouse_cb = SvREFCNT_inc_NN (cb);
2368
2369 return cb;
2370}
2371
2372/*****************************************************************************/
2373/* schedule-like-function opcode (SLF) */
2374
2375static UNOP slf_restore; /* restore stack as entersub did, for first-re-run */
2376static const CV *slf_cv;
2377static SV **slf_argv;
2378static int slf_argc, slf_arga; /* count, allocated */
2379static I32 slf_ax; /* top of stack, for restore */
2380
2381/* this restores the stack in the case we patched the entersub, to */
2382/* recreate the stack frame as perl will on following calls */
2383/* since entersub cleared the stack */
2384static OP *
2385pp_restore (pTHX)
2386{
2387 int i;
2388 SV **SP = PL_stack_base + slf_ax;
2389
2390 PUSHMARK (SP);
2391
2392 EXTEND (SP, slf_argc + 1);
2393
2394 for (i = 0; i < slf_argc; ++i)
2395 PUSHs (sv_2mortal (slf_argv [i]));
2396
2397 PUSHs ((SV *)CvGV (slf_cv));
2398
2399 RETURNOP (slf_restore.op_first);
2400}
2401
2402static void
2403slf_prepare_transfer (pTHX_ struct coro_transfer_args *ta)
2404{
2405 SV **arg = (SV **)slf_frame.data;
2406
2407 prepare_transfer (aTHX_ ta, arg [0], arg [1]);
2408}
2409
2410static void
2411slf_init_transfer (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2412{
2413 if (items != 2)
2414 croak ("Coro::State::transfer (prev, next) expects two arguments, not %d,", items);
2415
2416 frame->prepare = slf_prepare_transfer;
2417 frame->check = slf_check_nop;
2418 frame->data = (void *)arg; /* let's hope it will stay valid */
2419}
2420
2421static void
2422slf_init_schedule (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2423{
2424 frame->prepare = prepare_schedule;
2425 frame->check = slf_check_nop;
2426}
2427
2428static void
2429slf_prepare_schedule_to (pTHX_ struct coro_transfer_args *ta)
2430{
2431 struct coro *next = (struct coro *)slf_frame.data;
2432
2433 SvREFCNT_inc_NN (next->hv);
2434 prepare_schedule_to (aTHX_ ta, next);
2435}
2436
2437static void
2438slf_init_schedule_to (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2439{
2440 if (!items)
2441 croak ("Coro::schedule_to expects a coroutine argument, caught");
2442
2443 frame->data = (void *)SvSTATE (arg [0]);
2444 frame->prepare = slf_prepare_schedule_to;
2445 frame->check = slf_check_nop;
2446}
2447
2448static void
2449slf_init_cede_to (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2450{
2451 api_ready (aTHX_ SvRV (coro_current));
2452
2453 slf_init_schedule_to (aTHX_ frame, cv, arg, items);
2454}
2455
2456static void
2457slf_init_cede (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2458{
2459 frame->prepare = prepare_cede;
2460 frame->check = slf_check_nop;
2461}
2462
2463static void
2464slf_init_cede_notself (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2465{
2466 frame->prepare = prepare_cede_notself;
2467 frame->check = slf_check_nop;
2468}
2469
2470/* "undo"/cancel a running slf call - used when cancelling a coro, mainly */
2471static void
2472slf_destroy (pTHX_ struct coro *coro)
2473{
2474 /* this callback is reserved for slf functions needing to do cleanup */
2475 if (coro->slf_frame.destroy && coro->slf_frame.prepare && !PL_dirty)
2476 coro->slf_frame.destroy (aTHX_ coro);
2477
2478 /*
2479 * The on_destroy above most likely is from an SLF call.
2480 * Since by definition the SLF call will not finish when we destroy
2481 * the coro, we will have to force-finish it here, otherwise
2482 * cleanup functions cannot call SLF functions.
2483 */
2484 coro->slf_frame.prepare = 0;
2485}
2486
2487/*
2488 * these not obviously related functions are all rolled into one
2489 * function to increase chances that they all will call transfer with the same
2490 * stack offset
2491 * SLF stands for "schedule-like-function".
2492 */
2493static OP *
2494pp_slf (pTHX)
2495{
2496 I32 checkmark; /* mark SP to see how many elements check has pushed */
2497
2498 /* set up the slf frame, unless it has already been set-up */
2499 /* the latter happens when a new coro has been started */
2500 /* or when a new cctx was attached to an existing coroutine */
2501 if (expect_true (!slf_frame.prepare))
2502 {
2503 /* first iteration */
2504 dSP;
2505 SV **arg = PL_stack_base + TOPMARK + 1;
2506 int items = SP - arg; /* args without function object */
2507 SV *gv = *sp;
2508
2509 /* do a quick consistency check on the "function" object, and if it isn't */
2510 /* for us, divert to the real entersub */
2511 if (SvTYPE (gv) != SVt_PVGV
2512 || !GvCV (gv)
2513 || !(CvFLAGS (GvCV (gv)) & CVf_SLF))
2514 return PL_ppaddr[OP_ENTERSUB](aTHX);
2515
2516 if (!(PL_op->op_flags & OPf_STACKED))
827 { 2517 {
828 coro_nready--; 2518 /* ampersand-form of call, use @_ instead of stack */
829 return av_shift (coro_ready[prio]); 2519 AV *av = GvAV (PL_defgv);
2520 arg = AvARRAY (av);
2521 items = AvFILLp (av) + 1;
830 } 2522 }
2523
2524 /* now call the init function, which needs to set up slf_frame */
2525 ((coro_slf_cb)CvXSUBANY (GvCV (gv)).any_ptr)
2526 (aTHX_ &slf_frame, GvCV (gv), arg, items);
2527
2528 /* pop args */
2529 SP = PL_stack_base + POPMARK;
2530
2531 PUTBACK;
2532 }
2533
2534 /* now that we have a slf_frame, interpret it! */
2535 /* we use a callback system not to make the code needlessly */
2536 /* complicated, but so we can run multiple perl coros from one cctx */
2537
2538 do
2539 {
2540 struct coro_transfer_args ta;
2541
2542 slf_frame.prepare (aTHX_ &ta);
2543 TRANSFER (ta, 0);
2544
2545 checkmark = PL_stack_sp - PL_stack_base;
2546 }
2547 while (slf_frame.check (aTHX_ &slf_frame));
2548
2549 slf_frame.prepare = 0; /* invalidate the frame, we are done processing it */
2550
2551 /* exception handling */
2552 if (expect_false (CORO_THROW))
2553 {
2554 SV *exception = sv_2mortal (CORO_THROW);
2555
2556 CORO_THROW = 0;
2557 sv_setsv (ERRSV, exception);
2558 croak (0);
2559 }
2560
2561 /* return value handling - mostly like entersub */
2562 /* make sure we put something on the stack in scalar context */
2563 if (GIMME_V == G_SCALAR)
2564 {
2565 dSP;
2566 SV **bot = PL_stack_base + checkmark;
2567
2568 if (sp == bot) /* too few, push undef */
2569 bot [1] = &PL_sv_undef;
2570 else if (sp != bot + 1) /* too many, take last one */
2571 bot [1] = *sp;
2572
2573 SP = bot + 1;
2574
2575 PUTBACK;
2576 }
2577
2578 return NORMAL;
2579}
2580
2581static void
2582api_execute_slf (pTHX_ CV *cv, coro_slf_cb init_cb, I32 ax)
2583{
2584 int i;
2585 SV **arg = PL_stack_base + ax;
2586 int items = PL_stack_sp - arg + 1;
2587
2588 assert (("FATAL: SLF call with illegal CV value", !CvANON (cv)));
2589
2590 if (PL_op->op_ppaddr != PL_ppaddr [OP_ENTERSUB]
2591 && PL_op->op_ppaddr != pp_slf)
2592 croak ("FATAL: Coro SLF calls can only be made normally, not via goto or any other means, caught");
2593
2594 CvFLAGS (cv) |= CVf_SLF;
2595 CvXSUBANY (cv).any_ptr = (void *)init_cb;
2596 slf_cv = cv;
2597
2598 /* we patch the op, and then re-run the whole call */
2599 /* we have to put the same argument on the stack for this to work */
2600 /* and this will be done by pp_restore */
2601 slf_restore.op_next = (OP *)&slf_restore;
2602 slf_restore.op_type = OP_CUSTOM;
2603 slf_restore.op_ppaddr = pp_restore;
2604 slf_restore.op_first = PL_op;
2605
2606 slf_ax = ax - 1; /* undo the ax++ inside dAXMARK */
2607
2608 if (PL_op->op_flags & OPf_STACKED)
2609 {
2610 if (items > slf_arga)
2611 {
2612 slf_arga = items;
2613 Safefree (slf_argv);
2614 New (0, slf_argv, slf_arga, SV *);
2615 }
2616
2617 slf_argc = items;
2618
2619 for (i = 0; i < items; ++i)
2620 slf_argv [i] = SvREFCNT_inc (arg [i]);
2621 }
2622 else
2623 slf_argc = 0;
2624
2625 PL_op->op_ppaddr = pp_slf;
2626 /*PL_op->op_type = OP_CUSTOM; /* we do behave like entersub still */
2627
2628 PL_op = (OP *)&slf_restore;
2629}
2630
2631/*****************************************************************************/
2632/* dynamic wind */
2633
2634static void
2635on_enterleave_call (pTHX_ SV *cb)
2636{
2637 dSP;
2638
2639 PUSHSTACK;
2640
2641 PUSHMARK (SP);
2642 PUTBACK;
2643 call_sv (cb, G_VOID | G_DISCARD);
2644 SPAGAIN;
2645
2646 POPSTACK;
2647}
2648
2649static SV *
2650coro_avp_pop_and_free (pTHX_ AV **avp)
2651{
2652 AV *av = *avp;
2653 SV *res = av_pop (av);
2654
2655 if (AvFILLp (av) < 0)
2656 {
2657 *avp = 0;
2658 SvREFCNT_dec (av);
2659 }
2660
2661 return res;
2662}
2663
2664static void
2665coro_pop_on_enter (pTHX_ void *coro)
2666{
2667 SV *cb = coro_avp_pop_and_free (aTHX_ &((struct coro *)coro)->on_enter);
2668 SvREFCNT_dec (cb);
2669}
2670
2671static void
2672coro_pop_on_leave (pTHX_ void *coro)
2673{
2674 SV *cb = coro_avp_pop_and_free (aTHX_ &((struct coro *)coro)->on_leave);
2675 on_enterleave_call (aTHX_ sv_2mortal (cb));
2676}
2677
2678/*****************************************************************************/
2679/* PerlIO::cede */
2680
2681typedef struct
2682{
2683 PerlIOBuf base;
2684 NV next, every;
2685} PerlIOCede;
2686
2687static IV
2688PerlIOCede_pushed (pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
2689{
2690 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
2691
2692 self->every = SvCUR (arg) ? SvNV (arg) : 0.01;
2693 self->next = nvtime () + self->every;
2694
2695 return PerlIOBuf_pushed (aTHX_ f, mode, Nullsv, tab);
2696}
2697
2698static SV *
2699PerlIOCede_getarg (pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
2700{
2701 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
2702
2703 return newSVnv (self->every);
2704}
2705
2706static IV
2707PerlIOCede_flush (pTHX_ PerlIO *f)
2708{
2709 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
2710 double now = nvtime ();
2711
2712 if (now >= self->next)
2713 {
2714 api_cede (aTHX);
2715 self->next = now + self->every;
2716 }
2717
2718 return PerlIOBuf_flush (aTHX_ f);
2719}
2720
2721static PerlIO_funcs PerlIO_cede =
2722{
2723 sizeof(PerlIO_funcs),
2724 "cede",
2725 sizeof(PerlIOCede),
2726 PERLIO_K_DESTRUCT | PERLIO_K_RAW,
2727 PerlIOCede_pushed,
2728 PerlIOBuf_popped,
2729 PerlIOBuf_open,
2730 PerlIOBase_binmode,
2731 PerlIOCede_getarg,
2732 PerlIOBase_fileno,
2733 PerlIOBuf_dup,
2734 PerlIOBuf_read,
2735 PerlIOBuf_unread,
2736 PerlIOBuf_write,
2737 PerlIOBuf_seek,
2738 PerlIOBuf_tell,
2739 PerlIOBuf_close,
2740 PerlIOCede_flush,
2741 PerlIOBuf_fill,
2742 PerlIOBase_eof,
2743 PerlIOBase_error,
2744 PerlIOBase_clearerr,
2745 PerlIOBase_setlinebuf,
2746 PerlIOBuf_get_base,
2747 PerlIOBuf_bufsiz,
2748 PerlIOBuf_get_ptr,
2749 PerlIOBuf_get_cnt,
2750 PerlIOBuf_set_ptrcnt,
2751};
2752
2753/*****************************************************************************/
2754/* Coro::Semaphore & Coro::Signal */
2755
2756static SV *
2757coro_waitarray_new (pTHX_ int count)
2758{
2759 /* a waitarray=semaphore contains a counter IV in $sem->[0] and any waiters after that */
2760 AV *av = newAV ();
2761 SV **ary;
2762
2763 /* unfortunately, building manually saves memory */
2764 Newx (ary, 2, SV *);
2765 AvALLOC (av) = ary;
2766#if PERL_VERSION_ATLEAST (5,10,0)
2767 AvARRAY (av) = ary;
2768#else
2769 /* 5.8.8 needs this syntax instead of AvARRAY = ary, yet */
2770 /* -DDEBUGGING flags this as a bug, despite it perfectly working */
2771 SvPVX ((SV *)av) = (char *)ary;
2772#endif
2773 AvMAX (av) = 1;
2774 AvFILLp (av) = 0;
2775 ary [0] = newSViv (count);
2776
2777 return newRV_noinc ((SV *)av);
2778}
2779
2780/* semaphore */
2781
2782static void
2783coro_semaphore_adjust (pTHX_ AV *av, IV adjust)
2784{
2785 SV *count_sv = AvARRAY (av)[0];
2786 IV count = SvIVX (count_sv);
2787
2788 count += adjust;
2789 SvIVX (count_sv) = count;
2790
2791 /* now wake up as many waiters as are expected to lock */
2792 while (count > 0 && AvFILLp (av) > 0)
2793 {
2794 SV *cb;
2795
2796 /* swap first two elements so we can shift a waiter */
2797 AvARRAY (av)[0] = AvARRAY (av)[1];
2798 AvARRAY (av)[1] = count_sv;
2799 cb = av_shift (av);
2800
2801 if (SvOBJECT (cb))
2802 {
2803 api_ready (aTHX_ cb);
2804 --count;
2805 }
2806 else if (SvTYPE (cb) == SVt_PVCV)
2807 {
2808 dSP;
2809 PUSHMARK (SP);
2810 XPUSHs (sv_2mortal (newRV_inc ((SV *)av)));
2811 PUTBACK;
2812 call_sv (cb, G_VOID | G_DISCARD | G_EVAL | G_KEEPERR);
2813 }
2814
2815 SvREFCNT_dec (cb);
2816 }
2817}
2818
2819static void
2820coro_semaphore_destroy (pTHX_ struct coro *coro)
2821{
2822 /* call $sem->adjust (0) to possibly wake up some other waiters */
2823 coro_semaphore_adjust (aTHX_ (AV *)coro->slf_frame.data, 0);
2824}
2825
2826static int
2827slf_check_semaphore_down_or_wait (pTHX_ struct CoroSLF *frame, int acquire)
2828{
2829 AV *av = (AV *)frame->data;
2830 SV *count_sv = AvARRAY (av)[0];
2831
2832 /* if we are about to throw, don't actually acquire the lock, just throw */
2833 if (CORO_THROW)
2834 return 0;
2835 else if (SvIVX (count_sv) > 0)
2836 {
2837 frame->destroy = 0;
2838
2839 if (acquire)
2840 SvIVX (count_sv) = SvIVX (count_sv) - 1;
2841 else
2842 coro_semaphore_adjust (aTHX_ av, 0);
2843
2844 return 0;
2845 }
2846 else
2847 {
2848 int i;
2849 /* if we were woken up but can't down, we look through the whole */
2850 /* waiters list and only add us if we aren't in there already */
2851 /* this avoids some degenerate memory usage cases */
2852
2853 for (i = 1; i <= AvFILLp (av); ++i)
2854 if (AvARRAY (av)[i] == SvRV (coro_current))
2855 return 1;
2856
2857 av_push (av, SvREFCNT_inc (SvRV (coro_current)));
2858 return 1;
2859 }
2860}
2861
2862static int
2863slf_check_semaphore_down (pTHX_ struct CoroSLF *frame)
2864{
2865 return slf_check_semaphore_down_or_wait (aTHX_ frame, 1);
2866}
2867
2868static int
2869slf_check_semaphore_wait (pTHX_ struct CoroSLF *frame)
2870{
2871 return slf_check_semaphore_down_or_wait (aTHX_ frame, 0);
2872}
2873
2874static void
2875slf_init_semaphore_down_or_wait (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2876{
2877 AV *av = (AV *)SvRV (arg [0]);
2878
2879 if (SvIVX (AvARRAY (av)[0]) > 0)
2880 {
2881 frame->data = (void *)av;
2882 frame->prepare = prepare_nop;
2883 }
2884 else
2885 {
2886 av_push (av, SvREFCNT_inc (SvRV (coro_current)));
2887
2888 frame->data = (void *)sv_2mortal (SvREFCNT_inc ((SV *)av));
2889 frame->prepare = prepare_schedule;
2890 /* to avoid race conditions when a woken-up coro gets terminated */
2891 /* we arrange for a temporary on_destroy that calls adjust (0) */
2892 frame->destroy = coro_semaphore_destroy;
2893 }
2894}
2895
2896static void
2897slf_init_semaphore_down (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2898{
2899 slf_init_semaphore_down_or_wait (aTHX_ frame, cv, arg, items);
2900 frame->check = slf_check_semaphore_down;
2901}
2902
2903static void
2904slf_init_semaphore_wait (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2905{
2906 if (items >= 2)
2907 {
2908 /* callback form */
2909 AV *av = (AV *)SvRV (arg [0]);
2910 SV *cb_cv = s_get_cv_croak (arg [1]);
2911
2912 av_push (av, SvREFCNT_inc_NN (cb_cv));
2913
2914 if (SvIVX (AvARRAY (av)[0]) > 0)
2915 coro_semaphore_adjust (aTHX_ av, 0);
2916
2917 frame->prepare = prepare_nop;
2918 frame->check = slf_check_nop;
2919 }
2920 else
2921 {
2922 slf_init_semaphore_down_or_wait (aTHX_ frame, cv, arg, items);
2923 frame->check = slf_check_semaphore_wait;
2924 }
2925}
2926
2927/* signal */
2928
2929static void
2930coro_signal_wake (pTHX_ AV *av, int count)
2931{
2932 SvIVX (AvARRAY (av)[0]) = 0;
2933
2934 /* now signal count waiters */
2935 while (count > 0 && AvFILLp (av) > 0)
2936 {
2937 SV *cb;
2938
2939 /* swap first two elements so we can shift a waiter */
2940 cb = AvARRAY (av)[0];
2941 AvARRAY (av)[0] = AvARRAY (av)[1];
2942 AvARRAY (av)[1] = cb;
2943
2944 cb = av_shift (av);
2945
2946 if (SvTYPE (cb) == SVt_PVCV)
2947 {
2948 dSP;
2949 PUSHMARK (SP);
2950 XPUSHs (sv_2mortal (newRV_inc ((SV *)av)));
2951 PUTBACK;
2952 call_sv (cb, G_VOID | G_DISCARD | G_EVAL | G_KEEPERR);
2953 }
2954 else
2955 {
2956 api_ready (aTHX_ cb);
2957 sv_setiv (cb, 0); /* signal waiter */
2958 }
2959
2960 SvREFCNT_dec (cb);
2961
2962 --count;
2963 }
2964}
2965
2966static int
2967slf_check_signal_wait (pTHX_ struct CoroSLF *frame)
2968{
2969 /* if we are about to throw, also stop waiting */
2970 return SvROK ((SV *)frame->data) && !CORO_THROW;
2971}
2972
2973static void
2974slf_init_signal_wait (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2975{
2976 AV *av = (AV *)SvRV (arg [0]);
2977
2978 if (items >= 2)
2979 {
2980 SV *cb_cv = s_get_cv_croak (arg [1]);
2981 av_push (av, SvREFCNT_inc_NN (cb_cv));
2982
2983 if (SvIVX (AvARRAY (av)[0]))
2984 coro_signal_wake (aTHX_ av, 1); /* must be the only waiter */
2985
2986 frame->prepare = prepare_nop;
2987 frame->check = slf_check_nop;
2988 }
2989 else if (SvIVX (AvARRAY (av)[0]))
2990 {
2991 SvIVX (AvARRAY (av)[0]) = 0;
2992 frame->prepare = prepare_nop;
2993 frame->check = slf_check_nop;
2994 }
2995 else
2996 {
2997 SV *waiter = newSVsv (coro_current); /* owned by signal av */
2998
2999 av_push (av, waiter);
3000
3001 frame->data = (void *)sv_2mortal (SvREFCNT_inc_NN (waiter)); /* owned by process */
3002 frame->prepare = prepare_schedule;
3003 frame->check = slf_check_signal_wait;
3004 }
3005}
3006
3007/*****************************************************************************/
3008/* Coro::AIO */
3009
3010#define CORO_MAGIC_type_aio PERL_MAGIC_ext
3011
3012/* helper storage struct */
3013struct io_state
3014{
3015 int errorno;
3016 I32 laststype; /* U16 in 5.10.0 */
3017 int laststatval;
3018 Stat_t statcache;
3019};
3020
3021static void
3022coro_aio_callback (pTHX_ CV *cv)
3023{
3024 dXSARGS;
3025 AV *state = (AV *)S_GENSUB_ARG;
3026 SV *coro = av_pop (state);
3027 SV *data_sv = newSV (sizeof (struct io_state));
3028
3029 av_extend (state, items - 1);
3030
3031 sv_upgrade (data_sv, SVt_PV);
3032 SvCUR_set (data_sv, sizeof (struct io_state));
3033 SvPOK_only (data_sv);
3034
3035 {
3036 struct io_state *data = (struct io_state *)SvPVX (data_sv);
3037
3038 data->errorno = errno;
3039 data->laststype = PL_laststype;
3040 data->laststatval = PL_laststatval;
3041 data->statcache = PL_statcache;
3042 }
3043
3044 /* now build the result vector out of all the parameters and the data_sv */
3045 {
3046 int i;
3047
3048 for (i = 0; i < items; ++i)
3049 av_push (state, SvREFCNT_inc_NN (ST (i)));
3050 }
3051
3052 av_push (state, data_sv);
3053
3054 api_ready (aTHX_ coro);
3055 SvREFCNT_dec (coro);
3056 SvREFCNT_dec ((AV *)state);
3057}
3058
3059static int
3060slf_check_aio_req (pTHX_ struct CoroSLF *frame)
3061{
3062 AV *state = (AV *)frame->data;
3063
3064 /* if we are about to throw, return early */
3065 /* this does not cancel the aio request, but at least */
3066 /* it quickly returns */
3067 if (CORO_THROW)
3068 return 0;
3069
3070 /* one element that is an RV? repeat! */
3071 if (AvFILLp (state) == 0 && SvROK (AvARRAY (state)[0]))
3072 return 1;
3073
3074 /* restore status */
3075 {
3076 SV *data_sv = av_pop (state);
3077 struct io_state *data = (struct io_state *)SvPVX (data_sv);
3078
3079 errno = data->errorno;
3080 PL_laststype = data->laststype;
3081 PL_laststatval = data->laststatval;
3082 PL_statcache = data->statcache;
3083
3084 SvREFCNT_dec (data_sv);
3085 }
3086
3087 /* push result values */
3088 {
3089 dSP;
3090 int i;
3091
3092 EXTEND (SP, AvFILLp (state) + 1);
3093 for (i = 0; i <= AvFILLp (state); ++i)
3094 PUSHs (sv_2mortal (SvREFCNT_inc_NN (AvARRAY (state)[i])));
3095
3096 PUTBACK;
3097 }
831 3098
832 return 0; 3099 return 0;
833} 3100}
834 3101
835static void 3102static void
836api_ready (SV *coro) 3103slf_init_aio_req (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
837{ 3104{
838 dTHX; 3105 AV *state = (AV *)sv_2mortal ((SV *)newAV ());
839
840 if (SvROK (coro))
841 coro = SvRV (coro);
842
843 LOCK;
844 coro_enq (aTHX_ SvREFCNT_inc (coro));
845 UNLOCK;
846}
847
848static void
849api_schedule (void)
850{
851 dTHX;
852
853 SV *prev, *next;
854
855 LOCK;
856
857 prev = SvRV (GvSV (coro_current)); 3106 SV *coro_hv = SvRV (coro_current);
858 next = coro_deq (aTHX_ PRIO_MIN); 3107 struct coro *coro = SvSTATE_hv (coro_hv);
859 3108
860 if (!next) 3109 /* put our coroutine id on the state arg */
861 next = SvREFCNT_inc (SvRV (GvSV (coro_idle))); 3110 av_push (state, SvREFCNT_inc_NN (coro_hv));
862 3111
863 /* free this only after the transfer */ 3112 /* first see whether we have a non-zero priority and set it as AIO prio */
864 coro_mortal = prev; 3113 if (coro->prio)
865 SV_CORO (prev, "Coro::schedule"); 3114 {
3115 dSP;
866 3116
867 SvRV (GvSV (coro_current)) = next; 3117 static SV *prio_cv;
3118 static SV *prio_sv;
868 3119
869 SV_CORO (next, "Coro::schedule"); 3120 if (expect_false (!prio_cv))
3121 {
3122 prio_cv = (SV *)get_cv ("IO::AIO::aioreq_pri", 0);
3123 prio_sv = newSViv (0);
3124 }
870 3125
871 UNLOCK; 3126 PUSHMARK (SP);
3127 sv_setiv (prio_sv, coro->prio);
3128 XPUSHs (prio_sv);
872 3129
873 transfer (aTHX_ SvSTATE (prev), SvSTATE (next), 3130 PUTBACK;
874 TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK); 3131 call_sv (prio_cv, G_VOID | G_DISCARD);
875} 3132 }
876 3133
877static void 3134 /* now call the original request */
878api_cede (void) 3135 {
879{ 3136 dSP;
880 dTHX; 3137 CV *req = (CV *)CORO_MAGIC_NN ((SV *)cv, CORO_MAGIC_type_aio)->mg_obj;
3138 int i;
881 3139
882 LOCK; 3140 PUSHMARK (SP);
883 coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));
884 UNLOCK;
885 3141
886 api_schedule (); 3142 /* first push all args to the stack */
887} 3143 EXTEND (SP, items + 1);
888 3144
3145 for (i = 0; i < items; ++i)
3146 PUSHs (arg [i]);
3147
3148 /* now push the callback closure */
3149 PUSHs (sv_2mortal (s_gensub (aTHX_ coro_aio_callback, (void *)SvREFCNT_inc_NN ((SV *)state))));
3150
3151 /* now call the AIO function - we assume our request is uncancelable */
3152 PUTBACK;
3153 call_sv ((SV *)req, G_VOID | G_DISCARD);
3154 }
3155
3156 /* now that the request is going, we loop till we have a result */
3157 frame->data = (void *)state;
3158 frame->prepare = prepare_schedule;
3159 frame->check = slf_check_aio_req;
3160}
3161
3162static void
3163coro_aio_req_xs (pTHX_ CV *cv)
3164{
3165 dXSARGS;
3166
3167 CORO_EXECUTE_SLF_XS (slf_init_aio_req);
3168
3169 XSRETURN_EMPTY;
3170}
3171
3172/*****************************************************************************/
3173
3174#if CORO_CLONE
3175# include "clone.c"
3176#endif
3177
3178/*****************************************************************************/
3179
3180static SV *
3181coro_new (pTHX_ HV *stash, SV **argv, int argc, int is_coro)
3182{
3183 SV *coro_sv;
3184 struct coro *coro;
3185 MAGIC *mg;
3186 HV *hv;
3187 SV *cb;
3188 int i;
3189
3190 if (argc > 0)
3191 {
3192 cb = s_get_cv_croak (argv [0]);
3193
3194 if (!is_coro)
3195 {
3196 if (CvISXSUB (cb))
3197 croak ("Coro::State doesn't support XS functions as coroutine start, caught");
3198
3199 if (!CvROOT (cb))
3200 croak ("Coro::State doesn't support autoloaded or undefined functions as coroutine start, caught");
3201 }
3202 }
3203
3204 Newz (0, coro, 1, struct coro);
3205 coro->args = newAV ();
3206 coro->flags = CF_NEW;
3207
3208 if (coro_first) coro_first->prev = coro;
3209 coro->next = coro_first;
3210 coro_first = coro;
3211
3212 coro->hv = hv = newHV ();
3213 mg = sv_magicext ((SV *)hv, 0, CORO_MAGIC_type_state, &coro_state_vtbl, (char *)coro, 0);
3214 mg->mg_flags |= MGf_DUP;
3215 coro_sv = sv_bless (newRV_noinc ((SV *)hv), stash);
3216
3217 if (argc > 0)
3218 {
3219 av_extend (coro->args, argc + is_coro - 1);
3220
3221 if (is_coro)
3222 {
3223 av_push (coro->args, SvREFCNT_inc_NN ((SV *)cb));
3224 cb = (SV *)cv_coro_run;
3225 }
3226
3227 coro->startcv = (CV *)SvREFCNT_inc_NN ((SV *)cb);
3228
3229 for (i = 1; i < argc; i++)
3230 av_push (coro->args, newSVsv (argv [i]));
3231 }
3232
3233 return coro_sv;
3234}
3235
889MODULE = Coro::State PACKAGE = Coro::State 3236MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
890 3237
891PROTOTYPES: ENABLE 3238PROTOTYPES: DISABLE
892 3239
893BOOT: 3240BOOT:
894{ /* {} necessary for stoopid perl-5.6.x */ 3241{
895#ifdef USE_ITHREADS 3242#ifdef USE_ITHREADS
896 MUTEX_INIT (&coro_mutex); 3243# if CORO_PTHREAD
3244 coro_thx = PERL_GET_CONTEXT;
3245# endif
897#endif 3246#endif
3247 BOOT_PAGESIZE;
898 3248
899 ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1); 3249 cctx_current = cctx_new_empty ();
900 PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1); 3250
3251 irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
3252 stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
3253
3254 orig_sigelem_get = PL_vtbl_sigelem.svt_get; PL_vtbl_sigelem.svt_get = coro_sigelem_get;
3255 orig_sigelem_set = PL_vtbl_sigelem.svt_set; PL_vtbl_sigelem.svt_set = coro_sigelem_set;
3256 orig_sigelem_clr = PL_vtbl_sigelem.svt_clear; PL_vtbl_sigelem.svt_clear = coro_sigelem_clr;
3257
3258 hv_sig = coro_get_hv (aTHX_ "SIG", TRUE);
3259 rv_diehook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::diehook" , 0, SVt_PVCV));
3260 rv_warnhook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::warnhook", 0, SVt_PVCV));
3261
901 coro_state_stash = gv_stashpv ("Coro::State", TRUE); 3262 coro_state_stash = gv_stashpv ("Coro::State", TRUE);
902 3263
903 newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV)); 3264 newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
904 newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV)); 3265 newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
905 newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV)); 3266 newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
906 newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT)); 3267 newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
907 3268
908 main_mainstack = PL_mainstack; 3269 main_mainstack = PL_mainstack;
3270 main_top_env = PL_top_env;
909 3271
3272 while (main_top_env->je_prev)
3273 main_top_env = main_top_env->je_prev;
3274
3275 {
3276 SV *slf = sv_2mortal (newSViv (PTR2IV (pp_slf)));
3277
3278 if (!PL_custom_op_names) PL_custom_op_names = newHV ();
3279 hv_store_ent (PL_custom_op_names, slf, newSVpv ("coro_slf", 0), 0);
3280
3281 if (!PL_custom_op_descs) PL_custom_op_descs = newHV ();
3282 hv_store_ent (PL_custom_op_descs, slf, newSVpv ("coro schedule like function", 0), 0);
3283 }
3284
910 coroapi.ver = CORO_API_VERSION; 3285 coroapi.ver = CORO_API_VERSION;
3286 coroapi.rev = CORO_API_REVISION;
3287
911 coroapi.transfer = api_transfer; 3288 coroapi.transfer = api_transfer;
912}
913 3289
914Coro::State 3290 coroapi.sv_state = SvSTATE_;
915_newprocess(args) 3291 coroapi.execute_slf = api_execute_slf;
916 SV * args 3292 coroapi.prepare_nop = prepare_nop;
917 PROTOTYPE: $ 3293 coroapi.prepare_schedule = prepare_schedule;
3294 coroapi.prepare_cede = prepare_cede;
3295 coroapi.prepare_cede_notself = prepare_cede_notself;
3296
3297 time_init (aTHX);
3298
3299 assert (("PRIO_NORMAL must be 0", !CORO_PRIO_NORMAL));
3300}
3301
3302SV *
3303new (SV *klass, ...)
3304 ALIAS:
3305 Coro::new = 1
918 CODE: 3306 CODE:
919 Coro__State coro; 3307 RETVAL = coro_new (aTHX_ ix ? coro_stash : coro_state_stash, &ST (1), items - 1, ix);
920 3308 OUTPUT:
921 if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
922 croak ("Coro::State::_newprocess expects an arrayref");
923
924 Newz (0, coro, 1, struct coro);
925
926 coro->args = (AV *)SvREFCNT_inc (SvRV (args));
927 /*coro->mainstack = 0; *//*actual work is done inside transfer */
928 /*coro->stack = 0;*/
929
930 /* same as JMPENV_BOOTSTRAP */
931 /* we might be able to recycle start_env, but safe is safe */
932 /*Zero(&coro->start_env, 1, JMPENV);*/
933 coro->start_env.je_ret = -1;
934 coro->start_env.je_mustcatch = TRUE;
935
936 RETVAL = coro;
937 OUTPUT:
938 RETVAL 3309 RETVAL
939 3310
940void 3311void
941transfer(prev, next, flags) 3312transfer (...)
942 SV *prev
943 SV *next
944 int flags
945 PROTOTYPE: @ 3313 PROTOTYPE: $$
946 CODE: 3314 CODE:
947 PUTBACK; 3315 CORO_EXECUTE_SLF_XS (slf_init_transfer);
948 SV_CORO (next, "Coro::transfer");
949 SV_CORO (prev, "Coro::transfer");
950 transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);
951 SPAGAIN;
952 3316
953void 3317void
954DESTROY(coro)
955 Coro::State coro
956 CODE:
957
958 if (coro->mainstack && coro->mainstack != main_mainstack)
959 {
960 struct coro temp;
961
962 PUTBACK;
963 SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);
964 LOAD (aTHX_ coro);
965 SPAGAIN;
966
967 destroy_stacks (aTHX);
968
969 LOAD ((&temp)); /* this will get rid of defsv etc.. */
970 SPAGAIN;
971
972 coro->mainstack = 0;
973 }
974
975 deallocate_stack (coro);
976 SvREFCNT_dec (coro->args);
977 Safefree (coro);
978
979void
980_exit(code) 3318_exit (int code)
981 int code
982 PROTOTYPE: $ 3319 PROTOTYPE: $
983 CODE: 3320 CODE:
984 _exit (code); 3321 _exit (code);
985 3322
986MODULE = Coro::State PACKAGE = Coro::Cont 3323SV *
3324clone (Coro::State coro)
3325 CODE:
3326{
3327#if CORO_CLONE
3328 struct coro *ncoro = coro_clone (aTHX_ coro);
3329 MAGIC *mg;
3330 /* TODO: too much duplication */
3331 ncoro->hv = newHV ();
3332 mg = sv_magicext ((SV *)ncoro->hv, 0, CORO_MAGIC_type_state, &coro_state_vtbl, (char *)ncoro, 0);
3333 mg->mg_flags |= MGf_DUP;
3334 RETVAL = sv_bless (newRV_noinc ((SV *)ncoro->hv), SvSTASH (coro->hv));
3335#else
3336 croak ("Coro::State->clone has not been configured into this installation of Coro, realised");
3337#endif
3338}
3339 OUTPUT:
3340 RETVAL
987 3341
988# this is slightly dirty (should expose a c-level api) 3342int
3343cctx_stacksize (int new_stacksize = 0)
3344 PROTOTYPE: ;$
3345 CODE:
3346 RETVAL = cctx_stacksize;
3347 if (new_stacksize)
3348 {
3349 cctx_stacksize = new_stacksize;
3350 ++cctx_gen;
3351 }
3352 OUTPUT:
3353 RETVAL
3354
3355int
3356cctx_max_idle (int max_idle = 0)
3357 PROTOTYPE: ;$
3358 CODE:
3359 RETVAL = cctx_max_idle;
3360 if (max_idle > 1)
3361 cctx_max_idle = max_idle;
3362 OUTPUT:
3363 RETVAL
3364
3365int
3366cctx_count ()
3367 PROTOTYPE:
3368 CODE:
3369 RETVAL = cctx_count;
3370 OUTPUT:
3371 RETVAL
3372
3373int
3374cctx_idle ()
3375 PROTOTYPE:
3376 CODE:
3377 RETVAL = cctx_idle;
3378 OUTPUT:
3379 RETVAL
989 3380
990void 3381void
991yield(...) 3382list ()
992 PROTOTYPE: @ 3383 PROTOTYPE:
3384 PPCODE:
3385{
3386 struct coro *coro;
3387 for (coro = coro_first; coro; coro = coro->next)
3388 if (coro->hv)
3389 XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
3390}
3391
3392void
3393call (Coro::State coro, SV *coderef)
3394 ALIAS:
3395 eval = 1
3396 CODE:
3397{
3398 if (coro->mainstack && ((coro->flags & CF_RUNNING) || coro->slot))
3399 {
3400 struct coro *current = SvSTATE_current;
3401 struct CoroSLF slf_save;
3402
3403 if (current != coro)
3404 {
3405 PUTBACK;
3406 save_perl (aTHX_ current);
3407 load_perl (aTHX_ coro);
3408 /* the coro is most likely in an active SLF call.
3409 * while not strictly required (the code we execute is
3410 * not allowed to call any SLF functions), it's cleaner
3411 * to reinitialise the slf_frame and restore it later.
3412 * This might one day allow us to actually do SLF calls
3413 * from code executed here.
3414 */
3415 slf_save = slf_frame;
3416 slf_frame.prepare = 0;
3417 SPAGAIN;
3418 }
3419
3420 PUSHSTACK;
3421
3422 PUSHMARK (SP);
3423 PUTBACK;
3424
3425 if (ix)
3426 eval_sv (coderef, 0);
3427 else
3428 call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
3429
3430 POPSTACK;
3431 SPAGAIN;
3432
3433 if (current != coro)
3434 {
3435 PUTBACK;
3436 slf_frame = slf_save;
3437 save_perl (aTHX_ coro);
3438 load_perl (aTHX_ current);
3439 SPAGAIN;
3440 }
3441 }
3442}
3443
3444SV *
3445is_ready (Coro::State coro)
3446 PROTOTYPE: $
3447 ALIAS:
3448 is_ready = CF_READY
3449 is_running = CF_RUNNING
3450 is_new = CF_NEW
3451 is_destroyed = CF_DESTROYED
3452 is_suspended = CF_SUSPENDED
3453 CODE:
3454 RETVAL = boolSV (coro->flags & ix);
3455 OUTPUT:
3456 RETVAL
3457
3458void
3459throw (Coro::State self, SV *exception = &PL_sv_undef)
3460 PROTOTYPE: $;$
993 CODE: 3461 CODE:
994 SV *yieldstack; 3462{
995 SV *sv; 3463 struct coro *current = SvSTATE_current;
996 AV *defav = GvAV (PL_defgv); 3464 SV **exceptionp = self == current ? &CORO_THROW : &self->except;
997 struct coro *prev, *next;
998
999 yieldstack = *hv_fetch (
1000 (HV *)SvRV (GvSV (coro_current)),
1001 "yieldstack", sizeof ("yieldstack") - 1,
1002 0
1003 );
1004
1005 /* set up @_ -- ugly */
1006 av_clear (defav);
1007 av_fill (defav, items - 1);
1008 while (items--)
1009 av_store (defav, items, SvREFCNT_inc (ST(items)));
1010
1011 sv = av_pop ((AV *)SvRV (yieldstack));
1012 prev = INT2PTR (struct coro *, SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0))));
1013 next = INT2PTR (struct coro *, SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0))));
1014 SvREFCNT_dec (sv); 3465 SvREFCNT_dec (*exceptionp);
1015 3466 SvGETMAGIC (exception);
1016 transfer (aTHX_ prev, next, 0); 3467 *exceptionp = SvOK (exception) ? newSVsv (exception) : 0;
1017
1018MODULE = Coro::State PACKAGE = Coro
1019
1020# this is slightly dirty (should expose a c-level api)
1021
1022BOOT:
1023{
1024 int i;
1025 HV *stash = gv_stashpv ("Coro", TRUE);
1026
1027 newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));
1028 newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1029 newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1030 newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));
1031 newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1032 newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));
1033
1034 coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1035 coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1036
1037 for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1038 coro_ready[i] = newAV ();
1039
1040 {
1041 SV *sv = perl_get_sv("Coro::API", 1);
1042
1043 coroapi.schedule = api_schedule;
1044 coroapi.cede = api_cede;
1045 coroapi.ready = api_ready;
1046 coroapi.nready = &coro_nready;
1047 coroapi.current = coro_current;
1048
1049 GCoroAPI = &coroapi;
1050 sv_setiv(sv, (IV)&coroapi);
1051 SvREADONLY_on(sv);
1052 }
1053} 3468}
1054
1055#if !PERL_MICRO
1056 3469
1057void 3470void
1058ready(self) 3471api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
1059 SV * self 3472 PROTOTYPE: $;$
3473 C_ARGS: aTHX_ coro, flags
3474
3475SV *
3476has_cctx (Coro::State coro)
1060 PROTOTYPE: $ 3477 PROTOTYPE: $
1061 CODE: 3478 CODE:
1062 api_ready (self); 3479 /* maybe manage the running flag differently */
1063 3480 RETVAL = boolSV (!!coro->cctx || (coro->flags & CF_RUNNING));
1064#endif 3481 OUTPUT:
3482 RETVAL
1065 3483
1066int 3484int
3485is_traced (Coro::State coro)
3486 PROTOTYPE: $
3487 CODE:
3488 RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
3489 OUTPUT:
3490 RETVAL
3491
3492UV
3493rss (Coro::State coro)
3494 PROTOTYPE: $
3495 ALIAS:
3496 usecount = 1
3497 CODE:
3498 switch (ix)
3499 {
3500 case 0: RETVAL = coro_rss (aTHX_ coro); break;
3501 case 1: RETVAL = coro->usecount; break;
3502 }
3503 OUTPUT:
3504 RETVAL
3505
3506void
3507force_cctx ()
3508 PROTOTYPE:
3509 CODE:
3510 cctx_current->idle_sp = 0;
3511
3512void
3513swap_defsv (Coro::State self)
3514 PROTOTYPE: $
3515 ALIAS:
3516 swap_defav = 1
3517 CODE:
3518 if (!self->slot)
3519 croak ("cannot swap state with coroutine that has no saved state,");
3520 else
3521 {
3522 SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
3523 SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
3524
3525 SV *tmp = *src; *src = *dst; *dst = tmp;
3526 }
3527
3528void
3529cancel (Coro::State self)
3530 CODE:
3531 coro_state_destroy (aTHX_ self);
3532
3533SV *
3534enable_times (int enabled = enable_times)
3535 CODE:
3536{
3537 RETVAL = boolSV (enable_times);
3538
3539 if (enabled != enable_times)
3540 {
3541 enable_times = enabled;
3542
3543 coro_times_update ();
3544 (enabled ? coro_times_sub : coro_times_add)(SvSTATE (coro_current));
3545 }
3546}
3547 OUTPUT:
3548 RETVAL
3549
3550void
3551times (Coro::State self)
3552 PPCODE:
3553{
3554 struct coro *current = SvSTATE (coro_current);
3555
3556 if (expect_false (current == self))
3557 {
3558 coro_times_update ();
3559 coro_times_add (SvSTATE (coro_current));
3560 }
3561
3562 EXTEND (SP, 2);
3563 PUSHs (sv_2mortal (newSVnv (self->t_real [0] + self->t_real [1] * 1e-9)));
3564 PUSHs (sv_2mortal (newSVnv (self->t_cpu [0] + self->t_cpu [1] * 1e-9)));
3565
3566 if (expect_false (current == self))
3567 coro_times_sub (SvSTATE (coro_current));
3568}
3569
3570void
3571swap_sv (Coro::State coro, SV *sv, SV *swapsv)
3572 CODE:
3573{
3574 struct coro *current = SvSTATE_current;
3575
3576 if (current == coro)
3577 SWAP_SVS (current);
3578
3579 if (!coro->swap_sv)
3580 coro->swap_sv = newAV ();
3581
3582 av_push (coro->swap_sv, SvREFCNT_inc_NN (SvRV (sv )));
3583 av_push (coro->swap_sv, SvREFCNT_inc_NN (SvRV (swapsv)));
3584
3585 if (current == coro)
3586 SWAP_SVS (current);
3587}
3588
3589
3590MODULE = Coro::State PACKAGE = Coro
3591
3592BOOT:
3593{
3594 sv_pool_rss = coro_get_sv (aTHX_ "Coro::POOL_RSS" , TRUE);
3595 sv_pool_size = coro_get_sv (aTHX_ "Coro::POOL_SIZE" , TRUE);
3596 cv_coro_run = get_cv ( "Coro::_coro_run" , GV_ADD);
3597 coro_current = coro_get_sv (aTHX_ "Coro::current" , FALSE); SvREADONLY_on (coro_current);
3598 av_async_pool = coro_get_av (aTHX_ "Coro::async_pool", TRUE);
3599 av_destroy = coro_get_av (aTHX_ "Coro::destroy" , TRUE);
3600 sv_manager = coro_get_sv (aTHX_ "Coro::manager" , TRUE);
3601 sv_idle = coro_get_sv (aTHX_ "Coro::idle" , TRUE);
3602
3603 sv_async_pool_idle = newSVpv ("[async pool idle]", 0); SvREADONLY_on (sv_async_pool_idle);
3604 sv_Coro = newSVpv ("Coro", 0); SvREADONLY_on (sv_Coro);
3605 cv_pool_handler = get_cv ("Coro::pool_handler", GV_ADD); SvREADONLY_on (cv_pool_handler);
3606 CvNODEBUG_on (get_cv ("Coro::_pool_handler", 0)); /* work around a debugger bug */
3607
3608 coro_stash = gv_stashpv ("Coro", TRUE);
3609
3610 newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (CORO_PRIO_MAX));
3611 newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (CORO_PRIO_HIGH));
3612 newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (CORO_PRIO_NORMAL));
3613 newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (CORO_PRIO_LOW));
3614 newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (CORO_PRIO_IDLE));
3615 newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (CORO_PRIO_MIN));
3616
3617 {
3618 SV *sv = coro_get_sv (aTHX_ "Coro::API", TRUE);
3619
3620 coroapi.schedule = api_schedule;
3621 coroapi.schedule_to = api_schedule_to;
3622 coroapi.cede = api_cede;
3623 coroapi.cede_notself = api_cede_notself;
3624 coroapi.ready = api_ready;
3625 coroapi.is_ready = api_is_ready;
3626 coroapi.nready = coro_nready;
3627 coroapi.current = coro_current;
3628
3629 /*GCoroAPI = &coroapi;*/
3630 sv_setiv (sv, (IV)&coroapi);
3631 SvREADONLY_on (sv);
3632 }
3633}
3634
3635SV *
3636async (...)
3637 PROTOTYPE: &@
3638 CODE:
3639 RETVAL = coro_new (aTHX_ coro_stash, &ST (0), items, 1);
3640 api_ready (aTHX_ RETVAL);
3641 OUTPUT:
3642 RETVAL
3643
3644void
3645_destroy (Coro::State coro)
3646 CODE:
3647 /* used by the manager thread */
3648 coro_state_destroy (aTHX_ coro);
3649 coro_call_on_destroy (aTHX_ coro);
3650
3651void
3652terminate (...)
3653 CODE:
3654 CORO_EXECUTE_SLF_XS (slf_init_terminate);
3655
3656void
3657cancel (...)
3658 CODE:
3659 CORO_EXECUTE_SLF_XS (slf_init_cancel);
3660
3661int
3662safe_cancel (Coro::State self, ...)
3663 C_ARGS: aTHX_ self, &ST (1), items - 1
3664
3665void
3666schedule (...)
3667 CODE:
3668 CORO_EXECUTE_SLF_XS (slf_init_schedule);
3669
3670void
3671schedule_to (...)
3672 CODE:
3673 CORO_EXECUTE_SLF_XS (slf_init_schedule_to);
3674
3675void
3676cede_to (...)
3677 CODE:
3678 CORO_EXECUTE_SLF_XS (slf_init_cede_to);
3679
3680void
3681cede (...)
3682 CODE:
3683 CORO_EXECUTE_SLF_XS (slf_init_cede);
3684
3685void
3686cede_notself (...)
3687 CODE:
3688 CORO_EXECUTE_SLF_XS (slf_init_cede_notself);
3689
3690void
3691_set_current (SV *current)
3692 PROTOTYPE: $
3693 CODE:
3694 SvREFCNT_dec (SvRV (coro_current));
3695 SvRV_set (coro_current, SvREFCNT_inc_NN (SvRV (current)));
3696
3697void
3698_set_readyhook (SV *hook)
3699 PROTOTYPE: $
3700 CODE:
3701 SvREFCNT_dec (coro_readyhook);
3702 SvGETMAGIC (hook);
3703 if (SvOK (hook))
3704 {
3705 coro_readyhook = newSVsv (hook);
3706 CORO_READYHOOK = invoke_sv_ready_hook_helper;
3707 }
3708 else
3709 {
3710 coro_readyhook = 0;
3711 CORO_READYHOOK = 0;
3712 }
3713
3714int
3715prio (Coro::State coro, int newprio = 0)
3716 PROTOTYPE: $;$
3717 ALIAS:
3718 nice = 1
3719 CODE:
3720{
3721 RETVAL = coro->prio;
3722
3723 if (items > 1)
3724 {
3725 if (ix)
3726 newprio = coro->prio - newprio;
3727
3728 if (newprio < CORO_PRIO_MIN) newprio = CORO_PRIO_MIN;
3729 if (newprio > CORO_PRIO_MAX) newprio = CORO_PRIO_MAX;
3730
3731 coro->prio = newprio;
3732 }
3733}
3734 OUTPUT:
3735 RETVAL
3736
3737SV *
3738ready (SV *self)
3739 PROTOTYPE: $
3740 CODE:
3741 RETVAL = boolSV (api_ready (aTHX_ self));
3742 OUTPUT:
3743 RETVAL
3744
3745int
1067nready(...) 3746nready (...)
1068 PROTOTYPE: 3747 PROTOTYPE:
1069 CODE: 3748 CODE:
1070 RETVAL = coro_nready; 3749 RETVAL = coro_nready;
1071 OUTPUT: 3750 OUTPUT:
1072 RETVAL 3751 RETVAL
1073 3752
1074void 3753void
1075schedule(...) 3754suspend (Coro::State self)
1076 PROTOTYPE: 3755 PROTOTYPE: $
1077 CODE: 3756 CODE:
1078 api_schedule (); 3757 self->flags |= CF_SUSPENDED;
1079 3758
1080void 3759void
1081cede(...) 3760resume (Coro::State self)
1082 PROTOTYPE: 3761 PROTOTYPE: $
1083 CODE: 3762 CODE:
1084 api_cede (); 3763 self->flags &= ~CF_SUSPENDED;
1085 3764
1086# and these are hacks 3765void
3766_pool_handler (...)
3767 CODE:
3768 CORO_EXECUTE_SLF_XS (slf_init_pool_handler);
3769
3770void
3771async_pool (SV *cv, ...)
3772 PROTOTYPE: &@
3773 PPCODE:
3774{
3775 HV *hv = (HV *)av_pop (av_async_pool);
3776 AV *av = newAV ();
3777 SV *cb = ST (0);
3778 int i;
3779
3780 av_extend (av, items - 2);
3781 for (i = 1; i < items; ++i)
3782 av_push (av, SvREFCNT_inc_NN (ST (i)));
3783
3784 if ((SV *)hv == &PL_sv_undef)
3785 {
3786 SV *sv = coro_new (aTHX_ coro_stash, (SV **)&cv_pool_handler, 1, 1);
3787 hv = (HV *)SvREFCNT_inc_NN (SvRV (sv));
3788 SvREFCNT_dec (sv);
3789 }
3790
3791 {
3792 struct coro *coro = SvSTATE_hv (hv);
3793
3794 assert (!coro->invoke_cb);
3795 assert (!coro->invoke_av);
3796 coro->invoke_cb = SvREFCNT_inc (cb);
3797 coro->invoke_av = av;
3798 }
3799
3800 api_ready (aTHX_ (SV *)hv);
3801
3802 if (GIMME_V != G_VOID)
3803 XPUSHs (sv_2mortal (newRV_noinc ((SV *)hv)));
3804 else
3805 SvREFCNT_dec (hv);
3806}
3807
1087SV * 3808SV *
1088_aio_get_state () 3809rouse_cb ()
3810 PROTOTYPE:
1089 CODE: 3811 CODE:
1090{ 3812 RETVAL = coro_new_rouse_cb (aTHX);
1091 struct {
1092 int errorno;
1093 int laststype;
1094 int laststatval;
1095 Stat_t statcache;
1096 } data;
1097
1098 data.errorno = errno;
1099 data.laststype = PL_laststype;
1100 data.laststatval = PL_laststatval;
1101 data.statcache = PL_statcache;
1102
1103 RETVAL = newSVpvn ((char *)&data, sizeof data);
1104}
1105 OUTPUT: 3813 OUTPUT:
1106 RETVAL 3814 RETVAL
1107 3815
1108void 3816void
1109_aio_set_state (char *data_) 3817rouse_wait (...)
3818 PROTOTYPE: ;$
3819 PPCODE:
3820 CORO_EXECUTE_SLF_XS (slf_init_rouse_wait);
3821
3822void
3823on_enter (SV *block)
3824 ALIAS:
3825 on_leave = 1
1110 PROTOTYPE: $ 3826 PROTOTYPE: &
1111 CODE: 3827 CODE:
1112{ 3828{
1113 struct { 3829 struct coro *coro = SvSTATE_current;
3830 AV **avp = ix ? &coro->on_leave : &coro->on_enter;
3831
3832 block = s_get_cv_croak (block);
3833
3834 if (!*avp)
3835 *avp = newAV ();
3836
3837 av_push (*avp, SvREFCNT_inc (block));
3838
3839 if (!ix)
3840 on_enterleave_call (aTHX_ block);
3841
3842 LEAVE; /* pp_entersub unfortunately forces an ENTER/LEAVE around XS calls */
3843 SAVEDESTRUCTOR_X (ix ? coro_pop_on_leave : coro_pop_on_enter, (void *)coro);
3844 ENTER; /* pp_entersub unfortunately forces an ENTER/LEAVE around XS calls */
3845}
3846
3847
3848MODULE = Coro::State PACKAGE = PerlIO::cede
3849
3850BOOT:
3851 PerlIO_define_layer (aTHX_ &PerlIO_cede);
3852
3853
3854MODULE = Coro::State PACKAGE = Coro::Semaphore
3855
3856SV *
3857new (SV *klass, SV *count = 0)
3858 CODE:
3859{
3860 int semcnt = 1;
3861
3862 if (count)
3863 {
3864 SvGETMAGIC (count);
3865
3866 if (SvOK (count))
3867 semcnt = SvIV (count);
3868 }
3869
3870 RETVAL = sv_bless (
3871 coro_waitarray_new (aTHX_ semcnt),
3872 GvSTASH (CvGV (cv))
3873 );
3874}
3875 OUTPUT:
3876 RETVAL
3877
3878# helper for Coro::Channel and others
3879SV *
3880_alloc (int count)
3881 CODE:
3882 RETVAL = coro_waitarray_new (aTHX_ count);
3883 OUTPUT:
3884 RETVAL
3885
3886SV *
3887count (SV *self)
3888 CODE:
3889 RETVAL = newSVsv (AvARRAY ((AV *)SvRV (self))[0]);
3890 OUTPUT:
3891 RETVAL
3892
3893void
3894up (SV *self, int adjust = 1)
3895 ALIAS:
3896 adjust = 1
3897 CODE:
3898 coro_semaphore_adjust (aTHX_ (AV *)SvRV (self), ix ? adjust : 1);
3899
3900void
3901down (...)
3902 CODE:
3903 CORO_EXECUTE_SLF_XS (slf_init_semaphore_down);
3904
3905void
3906wait (...)
3907 CODE:
3908 CORO_EXECUTE_SLF_XS (slf_init_semaphore_wait);
3909
3910void
3911try (SV *self)
3912 PPCODE:
3913{
3914 AV *av = (AV *)SvRV (self);
3915 SV *count_sv = AvARRAY (av)[0];
3916 IV count = SvIVX (count_sv);
3917
3918 if (count > 0)
3919 {
3920 --count;
3921 SvIVX (count_sv) = count;
3922 XSRETURN_YES;
3923 }
3924 else
3925 XSRETURN_NO;
3926}
3927
3928void
3929waiters (SV *self)
3930 PPCODE:
3931{
3932 AV *av = (AV *)SvRV (self);
3933 int wcount = AvFILLp (av) + 1 - 1;
3934
3935 if (GIMME_V == G_SCALAR)
3936 XPUSHs (sv_2mortal (newSViv (wcount)));
3937 else
3938 {
1114 int errorno; 3939 int i;
1115 int laststype; 3940 EXTEND (SP, wcount);
1116 int laststatval; 3941 for (i = 1; i <= wcount; ++i)
1117 Stat_t statcache; 3942 PUSHs (sv_2mortal (newRV_inc (AvARRAY (av)[i])));
1118 } *data = (void *)data_; 3943 }
1119
1120 errno = data->errorno;
1121 PL_laststype = data->laststype;
1122 PL_laststatval = data->laststatval;
1123 PL_statcache = data->statcache;
1124} 3944}
3945
3946MODULE = Coro::State PACKAGE = Coro::SemaphoreSet
3947
3948void
3949_may_delete (SV *sem, int count, int extra_refs)
3950 PPCODE:
3951{
3952 AV *av = (AV *)SvRV (sem);
3953
3954 if (SvREFCNT ((SV *)av) == 1 + extra_refs
3955 && AvFILLp (av) == 0 /* no waiters, just count */
3956 && SvIV (AvARRAY (av)[0]) == count)
3957 XSRETURN_YES;
3958
3959 XSRETURN_NO;
3960}
3961
3962MODULE = Coro::State PACKAGE = Coro::Signal
3963
3964SV *
3965new (SV *klass)
3966 CODE:
3967 RETVAL = sv_bless (
3968 coro_waitarray_new (aTHX_ 0),
3969 GvSTASH (CvGV (cv))
3970 );
3971 OUTPUT:
3972 RETVAL
3973
3974void
3975wait (...)
3976 CODE:
3977 CORO_EXECUTE_SLF_XS (slf_init_signal_wait);
3978
3979void
3980broadcast (SV *self)
3981 CODE:
3982{
3983 AV *av = (AV *)SvRV (self);
3984 coro_signal_wake (aTHX_ av, AvFILLp (av));
3985}
3986
3987void
3988send (SV *self)
3989 CODE:
3990{
3991 AV *av = (AV *)SvRV (self);
3992
3993 if (AvFILLp (av))
3994 coro_signal_wake (aTHX_ av, 1);
3995 else
3996 SvIVX (AvARRAY (av)[0]) = 1; /* remember the signal */
3997}
3998
3999IV
4000awaited (SV *self)
4001 CODE:
4002 RETVAL = AvFILLp ((AV *)SvRV (self)) + 1 - 1;
4003 OUTPUT:
4004 RETVAL
4005
4006
4007MODULE = Coro::State PACKAGE = Coro::AnyEvent
4008
4009BOOT:
4010 sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);
4011
4012void
4013_schedule (...)
4014 CODE:
4015{
4016 static int incede;
4017
4018 api_cede_notself (aTHX);
4019
4020 ++incede;
4021 while (coro_nready >= incede && api_cede (aTHX))
4022 ;
4023
4024 sv_setsv (sv_activity, &PL_sv_undef);
4025 if (coro_nready >= incede)
4026 {
4027 PUSHMARK (SP);
4028 PUTBACK;
4029 call_pv ("Coro::AnyEvent::_activity", G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
4030 }
4031
4032 --incede;
4033}
4034
4035
4036MODULE = Coro::State PACKAGE = Coro::AIO
4037
4038void
4039_register (char *target, char *proto, SV *req)
4040 CODE:
4041{
4042 SV *req_cv = s_get_cv_croak (req);
4043 /* newXSproto doesn't return the CV on 5.8 */
4044 CV *slf_cv = newXS (target, coro_aio_req_xs, __FILE__);
4045 sv_setpv ((SV *)slf_cv, proto);
4046 sv_magicext ((SV *)slf_cv, (SV *)req_cv, CORO_MAGIC_type_aio, 0, 0, 0);
4047}
4048
4049MODULE = Coro::State PACKAGE = Coro::Select
4050
4051void
4052patch_pp_sselect ()
4053 CODE:
4054 if (!coro_old_pp_sselect)
4055 {
4056 coro_select_select = (SV *)get_cv ("Coro::Select::select", 0);
4057 coro_old_pp_sselect = PL_ppaddr [OP_SSELECT];
4058 PL_ppaddr [OP_SSELECT] = coro_pp_sselect;
4059 }
4060
4061void
4062unpatch_pp_sselect ()
4063 CODE:
4064 if (coro_old_pp_sselect)
4065 {
4066 PL_ppaddr [OP_SSELECT] = coro_old_pp_sselect;
4067 coro_old_pp_sselect = 0;
4068 }
4069

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