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Comparing Coro/Coro/State.xs (file contents):
Revision 1.12 by root, Sun Jul 22 03:24:10 2001 UTC vs.
Revision 1.294 by root, Tue Nov 18 08:31:03 2008 UTC

1#include "libcoro/coro.c"
2
3#define PERL_NO_GET_CONTEXT
4#define PERL_EXT
5
1#include "EXTERN.h" 6#include "EXTERN.h"
2#include "perl.h" 7#include "perl.h"
3#include "XSUB.h" 8#include "XSUB.h"
9#include "perliol.h"
4 10
5#if 1 11#include "patchlevel.h"
6# define CHK(x) (void *)0 12
13#include <stdio.h>
14#include <errno.h>
15#include <assert.h>
16
17#ifdef WIN32
18# undef setjmp
19# undef longjmp
20# undef _exit
21# define setjmp _setjmp // deep magic, don't ask
7#else 22#else
8# define CHK(x) if (!(x)) croak("FATAL, CHK: " #x) 23# include <inttypes.h> /* most portable stdint.h */
24#endif
25
26#ifdef HAVE_MMAP
27# include <unistd.h>
28# include <sys/mman.h>
29# ifndef MAP_ANONYMOUS
30# ifdef MAP_ANON
31# define MAP_ANONYMOUS MAP_ANON
32# else
33# undef HAVE_MMAP
34# endif
9#endif 35# endif
36# include <limits.h>
37# ifndef PAGESIZE
38# define PAGESIZE pagesize
39# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
40static long pagesize;
41# else
42# define BOOT_PAGESIZE (void)0
43# endif
44#else
45# define PAGESIZE 0
46# define BOOT_PAGESIZE (void)0
47#endif
10 48
11#define MAY_FLUSH /* increases codesize */ 49#if CORO_USE_VALGRIND
50# include <valgrind/valgrind.h>
51#endif
12 52
13#define SUB_INIT "Coro::State::initialize" 53/* the maximum number of idle cctx that will be pooled */
54static int cctx_max_idle = 4;
14 55
15#define TRANSFER_SAVE_DEFAV 0x00000001 56#define PERL_VERSION_ATLEAST(a,b,c) \
16#define TRANSFER_SAVE_DEFSV 0x00000002 57 (PERL_REVISION > (a) \
17#define TRANSFER_SAVE_ERRSV 0x00000004 58 || (PERL_REVISION == (a) \
59 && (PERL_VERSION > (b) \
60 || (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
18 61
19#define TRANSFER_SAVE_ALL -1 62#if !PERL_VERSION_ATLEAST (5,6,0)
63# ifndef PL_ppaddr
64# define PL_ppaddr ppaddr
65# endif
66# ifndef call_sv
67# define call_sv perl_call_sv
68# endif
69# ifndef get_sv
70# define get_sv perl_get_sv
71# endif
72# ifndef get_cv
73# define get_cv perl_get_cv
74# endif
75# ifndef IS_PADGV
76# define IS_PADGV(v) 0
77# endif
78# ifndef IS_PADCONST
79# define IS_PADCONST(v) 0
80# endif
81#endif
20 82
83/* 5.11 */
84#ifndef CxHASARGS
85# define CxHASARGS(cx) (cx)->blk_sub.hasargs
86#endif
87
88/* 5.10.0 */
89#ifndef SvREFCNT_inc_NN
90# define SvREFCNT_inc_NN(sv) SvREFCNT_inc (sv)
91#endif
92
93/* 5.8.8 */
94#ifndef GV_NOTQUAL
95# define GV_NOTQUAL 0
96#endif
97#ifndef newSV
98# define newSV(l) NEWSV(0,l)
99#endif
100#ifndef CvISXSUB_on
101# define CvISXSUB_on(cv) (void)cv
102#endif
103
104/* 5.8.7 */
105#ifndef SvRV_set
106# define SvRV_set(s,v) SvRV(s) = (v)
107#endif
108
109#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
110# undef CORO_STACKGUARD
111#endif
112
113#ifndef CORO_STACKGUARD
114# define CORO_STACKGUARD 0
115#endif
116
117/* prefer perl internal functions over our own? */
118#ifndef CORO_PREFER_PERL_FUNCTIONS
119# define CORO_PREFER_PERL_FUNCTIONS 0
120#endif
121
122/* The next macros try to return the current stack pointer, in an as
123 * portable way as possible. */
124#if __GNUC__ >= 4
125# define dSTACKLEVEL int stacklevel_dummy
126# define STACKLEVEL __builtin_frame_address (0)
127#else
128# define dSTACKLEVEL volatile void *stacklevel
129# define STACKLEVEL ((void *)&stacklevel)
130#endif
131
132#define IN_DESTRUCT (PL_main_cv == Nullcv)
133
134#if __GNUC__ >= 3
135# define attribute(x) __attribute__(x)
136# define expect(expr,value) __builtin_expect ((expr),(value))
137# define INLINE static inline
138#else
139# define attribute(x)
140# define expect(expr,value) (expr)
141# define INLINE static
142#endif
143
144#define expect_false(expr) expect ((expr) != 0, 0)
145#define expect_true(expr) expect ((expr) != 0, 1)
146
147#define NOINLINE attribute ((noinline))
148
149#include "CoroAPI.h"
150
151#ifdef USE_ITHREADS
152# if CORO_PTHREAD
153static void *coro_thx;
154# endif
155#endif
156
157static double (*nvtime)(); /* so why doesn't it take void? */
158
159/* we hijack an hopefully unused CV flag for our purposes */
160#define CVf_SLF 0x4000
161static OP *pp_slf (pTHX);
162
163static U32 cctx_gen;
164static size_t cctx_stacksize = CORO_STACKSIZE;
165static struct CoroAPI coroapi;
166static AV *main_mainstack; /* used to differentiate between $main and others */
167static JMPENV *main_top_env;
168static HV *coro_state_stash, *coro_stash;
169static volatile SV *coro_mortal; /* will be freed/thrown after next transfer */
170
171static GV *irsgv; /* $/ */
172static GV *stdoutgv; /* *STDOUT */
173static SV *rv_diehook;
174static SV *rv_warnhook;
175static HV *hv_sig; /* %SIG */
176
177/* async_pool helper stuff */
178static SV *sv_pool_rss;
179static SV *sv_pool_size;
180static AV *av_async_pool;
181
182/* Coro::AnyEvent */
183static SV *sv_activity;
184
185static struct coro_cctx *cctx_first;
186static int cctx_count, cctx_idle;
187
188enum {
189 CC_MAPPED = 0x01,
190 CC_NOREUSE = 0x02, /* throw this away after tracing */
191 CC_TRACE = 0x04,
192 CC_TRACE_SUB = 0x08, /* trace sub calls */
193 CC_TRACE_LINE = 0x10, /* trace each statement */
194 CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
195};
196
197/* this is a structure representing a c-level coroutine */
198typedef struct coro_cctx
199{
200 struct coro_cctx *next;
201
202 /* the stack */
203 void *sptr;
204 size_t ssize;
205
206 /* cpu state */
207 void *idle_sp; /* sp of top-level transfer/schedule/cede call */
208 JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
209 JMPENV *top_env;
210 coro_context cctx;
211
212 U32 gen;
213#if CORO_USE_VALGRIND
214 int valgrind_id;
215#endif
216 unsigned char flags;
217} coro_cctx;
218
219enum {
220 CF_RUNNING = 0x0001, /* coroutine is running */
221 CF_READY = 0x0002, /* coroutine is ready */
222 CF_NEW = 0x0004, /* has never been switched to */
223 CF_DESTROYED = 0x0008, /* coroutine data has been freed */
224};
225
226/* the structure where most of the perl state is stored, overlaid on the cxstack */
227typedef struct
228{
229 SV *defsv;
230 AV *defav;
231 SV *errsv;
232 SV *irsgv;
233#define VAR(name,type) type name;
234# include "state.h"
235#undef VAR
236} perl_slots;
237
238#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
239
240/* this is a structure representing a perl-level coroutine */
21struct coro { 241struct coro {
22 /* optionally saved, might be zero */ 242 /* the C coroutine allocated to this perl coroutine, if any */
23 AV *defav; 243 coro_cctx *cctx;
24 SV *defsv;
25 SV *errsv;
26
27 /* saved global state not related to stacks */
28 U8 dowarn;
29 244
30 /* the stacks and related info (callchain etc..) */ 245 /* state data */
31 PERL_SI *curstackinfo; 246 struct CoroSLF slf_frame; /* saved slf frame */
32 AV *curstack;
33 AV *mainstack; 247 AV *mainstack;
34 SV **stack_sp; 248 perl_slots *slot; /* basically the saved sp */
35 OP *op;
36 SV **curpad;
37 SV **stack_base;
38 SV **stack_max;
39 SV **tmps_stack;
40 I32 tmps_floor;
41 I32 tmps_ix;
42 I32 tmps_max;
43 I32 *markstack;
44 I32 *markstack_ptr;
45 I32 *markstack_max;
46 I32 *scopestack;
47 I32 scopestack_ix;
48 I32 scopestack_max;
49 ANY *savestack;
50 I32 savestack_ix;
51 I32 savestack_max;
52 OP **retstack;
53 I32 retstack_ix;
54 I32 retstack_max;
55 COP *curcop;
56 249
57 /* data associated with this coroutine (initial args) */ 250 AV *args; /* data associated with this coroutine (initial args) */
58 AV *args; 251 int refcnt; /* coroutines are refcounted, yes */
252 int flags; /* CF_ flags */
253 HV *hv; /* the perl hash associated with this coro, if any */
254 void (*on_destroy)(pTHX_ struct coro *coro);
255
256 /* statistics */
257 int usecount; /* number of transfers to this coro */
258
259 /* coro process data */
260 int prio;
261 SV *throw; /* exception to be thrown */
262
263 /* async_pool */
264 SV *saved_deffh;
265
266 /* linked list */
267 struct coro *next, *prev;
59}; 268};
60 269
61typedef struct coro *Coro__State; 270typedef struct coro *Coro__State;
62typedef struct coro *Coro__State_or_hashref; 271typedef struct coro *Coro__State_or_hashref;
63 272
64static AV *main_mainstack; /* used to differentiate between $main and others */ 273/* the following variables are effectively part of the perl context */
274/* and get copied between struct coro and these variables */
275/* the mainr easonw e don't support windows process emulation */
276static struct CoroSLF slf_frame; /* the current slf frame */
277static SV *coro_throw;
65 278
66static HV *padlist_cache; 279/** Coro ********************************************************************/
67 280
68/* mostly copied from op.c:cv_clone2 */ 281#define PRIO_MAX 3
69STATIC AV * 282#define PRIO_HIGH 1
70clone_padlist (AV *protopadlist) 283#define PRIO_NORMAL 0
284#define PRIO_LOW -1
285#define PRIO_IDLE -3
286#define PRIO_MIN -4
287
288/* for Coro.pm */
289static SV *coro_current;
290static SV *coro_readyhook;
291static AV *coro_ready [PRIO_MAX - PRIO_MIN + 1];
292static struct coro *coro_first;
293#define coro_nready coroapi.nready
294
295/** lowlevel stuff **********************************************************/
296
297static SV *
298coro_get_sv (pTHX_ const char *name, int create)
71{ 299{
72 AV *av; 300#if PERL_VERSION_ATLEAST (5,10,0)
73 I32 ix; 301 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
74 AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE); 302 get_sv (name, create);
75 AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE); 303#endif
76 SV **pname = AvARRAY (protopad_name); 304 return get_sv (name, create);
77 SV **ppad = AvARRAY (protopad); 305}
78 I32 fname = AvFILLp (protopad_name); 306
79 I32 fpad = AvFILLp (protopad); 307static AV *
308coro_get_av (pTHX_ const char *name, int create)
309{
310#if PERL_VERSION_ATLEAST (5,10,0)
311 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
312 get_av (name, create);
313#endif
314 return get_av (name, create);
315}
316
317static HV *
318coro_get_hv (pTHX_ const char *name, int create)
319{
320#if PERL_VERSION_ATLEAST (5,10,0)
321 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
322 get_hv (name, create);
323#endif
324 return get_hv (name, create);
325}
326
327static AV *
328coro_clone_padlist (pTHX_ CV *cv)
329{
330 AV *padlist = CvPADLIST (cv);
80 AV *newpadlist, *newpad_name, *newpad; 331 AV *newpadlist, *newpad;
81 SV **npad;
82
83 newpad_name = newAV ();
84 for (ix = fname; ix >= 0; ix--)
85 av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
86
87 newpad = newAV ();
88 av_fill (newpad, AvFILLp (protopad));
89 npad = AvARRAY (newpad);
90 332
91 newpadlist = newAV (); 333 newpadlist = newAV ();
92 AvREAL_off (newpadlist); 334 AvREAL_off (newpadlist);
93 av_store (newpadlist, 0, (SV *) newpad_name); 335#if PERL_VERSION_ATLEAST (5,10,0)
336 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
337#else
338 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
339#endif
340 newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
341 --AvFILLp (padlist);
342
343 av_store (newpadlist, 0, SvREFCNT_inc_NN (*av_fetch (padlist, 0, FALSE)));
94 av_store (newpadlist, 1, (SV *) newpad); 344 av_store (newpadlist, 1, (SV *)newpad);
95 345
96 av = newAV (); /* will be @_ */ 346 return newpadlist;
97 av_extend (av, 0); 347}
98 av_store (newpad, 0, (SV *) av);
99 AvFLAGS (av) = AVf_REIFY;
100 348
101 for (ix = fpad; ix > 0; ix--) 349static void
350free_padlist (pTHX_ AV *padlist)
351{
352 /* may be during global destruction */
353 if (SvREFCNT (padlist))
102 { 354 {
103 SV *namesv = (ix <= fname) ? pname[ix] : Nullsv; 355 I32 i = AvFILLp (padlist);
104 if (namesv && namesv != &PL_sv_undef) 356 while (i >= 0)
105 { 357 {
106 char *name = SvPVX (namesv); /* XXX */ 358 SV **svp = av_fetch (padlist, i--, FALSE);
107 if (SvFLAGS (namesv) & SVf_FAKE || *name == '&') 359 if (svp)
108 { /* lexical from outside? */
109 npad[ix] = SvREFCNT_inc (ppad[ix]);
110 } 360 {
111 else
112 { /* our own lexical */
113 SV *sv; 361 SV *sv;
114 if (*name == '&') 362 while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
115 sv = SvREFCNT_inc (ppad[ix]); 363 SvREFCNT_dec (sv);
116 else if (*name == '@') 364
117 sv = (SV *) newAV (); 365 SvREFCNT_dec (*svp);
118 else if (*name == '%')
119 sv = (SV *) newHV ();
120 else
121 sv = NEWSV (0, 0);
122 if (!SvPADBUSY (sv))
123 SvPADMY_on (sv);
124 npad[ix] = sv;
125 } 366 }
126 } 367 }
127 else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
128 {
129 npad[ix] = SvREFCNT_inc (ppad[ix]);
130 }
131 else
132 {
133 SV *sv = NEWSV (0, 0);
134 SvPADTMP_on (sv);
135 npad[ix] = sv;
136 }
137 }
138 368
139#if 0 /* return -ENOTUNDERSTOOD */
140 /* Now that vars are all in place, clone nested closures. */
141
142 for (ix = fpad; ix > 0; ix--) {
143 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
144 if (namesv
145 && namesv != &PL_sv_undef
146 && !(SvFLAGS(namesv) & SVf_FAKE)
147 && *SvPVX(namesv) == '&'
148 && CvCLONE(ppad[ix]))
149 {
150 CV *kid = cv_clone((CV*)ppad[ix]);
151 SvREFCNT_dec(ppad[ix]);
152 CvCLONE_on(kid);
153 SvPADMY_on(kid);
154 npad[ix] = (SV*)kid;
155 }
156 }
157#endif
158
159 return newpadlist;
160}
161
162#ifdef MAY_FLUSH
163STATIC AV *
164free_padlist (AV *padlist)
165{
166 /* may be during global destruction */
167 if (SvREFCNT(padlist))
168 {
169 I32 i = AvFILLp(padlist);
170 while (i >= 0)
171 {
172 SV **svp = av_fetch(padlist, i--, FALSE);
173 SV *sv = svp ? *svp : Nullsv;
174 if (sv)
175 SvREFCNT_dec(sv);
176 }
177
178 SvREFCNT_dec((SV*)padlist); 369 SvREFCNT_dec ((SV*)padlist);
179 } 370 }
180} 371}
181#endif 372
373static int
374coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
375{
376 AV *padlist;
377 AV *av = (AV *)mg->mg_obj;
378
379 /* casting is fun. */
380 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
381 free_padlist (aTHX_ padlist);
382
383 SvREFCNT_dec (av); /* sv_magicext increased the refcount */
384
385 return 0;
386}
387
388#define CORO_MAGIC_type_cv 26
389#define CORO_MAGIC_type_state PERL_MAGIC_ext
390
391static MGVTBL coro_cv_vtbl = {
392 0, 0, 0, 0,
393 coro_cv_free
394};
395
396#define CORO_MAGIC_NN(sv, type) \
397 (expect_true (SvMAGIC (sv)->mg_type == type) \
398 ? SvMAGIC (sv) \
399 : mg_find (sv, type))
400
401#define CORO_MAGIC(sv, type) \
402 (expect_true (SvMAGIC (sv)) \
403 ? CORO_MAGIC_NN (sv, type) \
404 : 0)
405
406#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
407#define CORO_MAGIC_state(sv) CORO_MAGIC_NN (((SV *)(sv)), CORO_MAGIC_type_state)
408
409INLINE struct coro *
410SvSTATE_ (pTHX_ SV *coro)
411{
412 HV *stash;
413 MAGIC *mg;
414
415 if (SvROK (coro))
416 coro = SvRV (coro);
417
418 if (expect_false (SvTYPE (coro) != SVt_PVHV))
419 croak ("Coro::State object required");
420
421 stash = SvSTASH (coro);
422 if (expect_false (stash != coro_stash && stash != coro_state_stash))
423 {
424 /* very slow, but rare, check */
425 if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
426 croak ("Coro::State object required");
427 }
428
429 mg = CORO_MAGIC_state (coro);
430 return (struct coro *)mg->mg_ptr;
431}
432
433#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
434
435/* faster than SvSTATE, but expects a coroutine hv */
436#define SvSTATE_hv(hv) ((struct coro *)CORO_MAGIC_NN ((SV *)hv, CORO_MAGIC_type_state)->mg_ptr)
437#define SvSTATE_current SvSTATE_hv (SvRV (coro_current))
182 438
183/* the next two functions merely cache the padlists */ 439/* the next two functions merely cache the padlists */
184STATIC void 440static void
185get_padlist (CV *cv) 441get_padlist (pTHX_ CV *cv)
186{ 442{
187 SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0); 443 MAGIC *mg = CORO_MAGIC_cv (cv);
444 AV *av;
188 445
189 if (he && AvFILLp ((AV *)*he) >= 0) 446 if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
190 CvPADLIST (cv) = (AV *)av_pop ((AV *)*he); 447 CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
191 else 448 else
192 CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
193}
194
195STATIC void
196put_padlist (CV *cv)
197{
198 SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
199
200 if (SvTYPE (*he) != SVt_PVAV)
201 { 449 {
450#if CORO_PREFER_PERL_FUNCTIONS
451 /* this is probably cleaner? but also slower! */
452 /* in practise, it seems to be less stable */
453 CV *cp = Perl_cv_clone (cv);
454 CvPADLIST (cv) = CvPADLIST (cp);
455 CvPADLIST (cp) = 0;
202 SvREFCNT_dec (*he); 456 SvREFCNT_dec (cp);
203 *he = (SV *)newAV (); 457#else
458 CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
459#endif
204 } 460 }
205
206 av_push ((AV *)*he, (SV *)CvPADLIST (cv));
207} 461}
208 462
209#ifdef MAY_FLUSH
210STATIC void
211flush_padlist_cache ()
212{
213 HV *hv = padlist_cache;
214 padlist_cache = newHV ();
215
216 if (hv_iterinit (hv))
217 {
218 HE *he;
219 AV *padlist;
220
221 while (!!(he = hv_iternext (hv)))
222 {
223 AV *av = (AV *)HeVAL(he);
224
225 /* casting is fun. */
226 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
227 free_padlist (padlist);
228 }
229 }
230
231 SvREFCNT_dec (hv);
232}
233#endif
234
235#define SB do {
236#define SE } while (0)
237
238#define LOAD(state) SB load_state(aTHX_ state); SPAGAIN; SE
239#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ state,flags); SE
240
241#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE
242
243static void 463static void
464put_padlist (pTHX_ CV *cv)
465{
466 MAGIC *mg = CORO_MAGIC_cv (cv);
467 AV *av;
468
469 if (expect_false (!mg))
470 mg = sv_magicext ((SV *)cv, (SV *)newAV (), CORO_MAGIC_type_cv, &coro_cv_vtbl, 0, 0);
471
472 av = (AV *)mg->mg_obj;
473
474 if (expect_false (AvFILLp (av) >= AvMAX (av)))
475 av_extend (av, AvMAX (av) + 1);
476
477 AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
478}
479
480/** load & save, init *******************************************************/
481
482static void
244load_state(pTHX_ Coro__State c) 483load_perl (pTHX_ Coro__State c)
245{ 484{
246 PL_dowarn = c->dowarn; 485 perl_slots *slot = c->slot;
486 c->slot = 0;
247 487
248 PL_curstackinfo = c->curstackinfo;
249 PL_curstack = c->curstack;
250 PL_mainstack = c->mainstack; 488 PL_mainstack = c->mainstack;
251 PL_stack_sp = c->stack_sp;
252 PL_op = c->op;
253 PL_curpad = c->curpad;
254 PL_stack_base = c->stack_base;
255 PL_stack_max = c->stack_max;
256 PL_tmps_stack = c->tmps_stack;
257 PL_tmps_floor = c->tmps_floor;
258 PL_tmps_ix = c->tmps_ix;
259 PL_tmps_max = c->tmps_max;
260 PL_markstack = c->markstack;
261 PL_markstack_ptr = c->markstack_ptr;
262 PL_markstack_max = c->markstack_max;
263 PL_scopestack = c->scopestack;
264 PL_scopestack_ix = c->scopestack_ix;
265 PL_scopestack_max = c->scopestack_max;
266 PL_savestack = c->savestack;
267 PL_savestack_ix = c->savestack_ix;
268 PL_savestack_max = c->savestack_max;
269 PL_retstack = c->retstack;
270 PL_retstack_ix = c->retstack_ix;
271 PL_retstack_max = c->retstack_max;
272 PL_curcop = c->curcop;
273 489
274 if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav); 490 GvSV (PL_defgv) = slot->defsv;
275 if (c->defsv) REPLACE_SV (DEFSV , c->defsv); 491 GvAV (PL_defgv) = slot->defav;
276 if (c->errsv) REPLACE_SV (ERRSV , c->errsv); 492 GvSV (PL_errgv) = slot->errsv;
493 GvSV (irsgv) = slot->irsgv;
494
495 #define VAR(name,type) PL_ ## name = slot->name;
496 # include "state.h"
497 #undef VAR
277 498
278 { 499 {
279 dSP; 500 dSP;
501
280 CV *cv; 502 CV *cv;
281 503
282 /* now do the ugly restore mess */ 504 /* now do the ugly restore mess */
283 while ((cv = (CV *)POPs)) 505 while (expect_true (cv = (CV *)POPs))
284 { 506 {
285 AV *padlist = (AV *)POPs;
286
287 if (padlist)
288 {
289 put_padlist (cv); /* mark this padlist as available */ 507 put_padlist (aTHX_ cv); /* mark this padlist as available */
290 CvPADLIST(cv) = padlist; 508 CvDEPTH (cv) = PTR2IV (POPs);
291#ifdef USE_THREADS 509 CvPADLIST (cv) = (AV *)POPs;
292 /*CvOWNER(cv) = (struct perl_thread *)POPs;*/
293#endif
294 }
295
296 ++CvDEPTH(cv);
297 } 510 }
298 511
299 PUTBACK; 512 PUTBACK;
300 } 513 }
301}
302 514
515 slf_frame = c->slf_frame;
516 coro_throw = c->throw;
517}
518
303static void 519static void
304save_state(pTHX_ Coro__State c, int flags) 520save_perl (pTHX_ Coro__State c)
305{ 521{
522 c->throw = coro_throw;
523 c->slf_frame = slf_frame;
524
306 { 525 {
307 dSP; 526 dSP;
308 I32 cxix = cxstack_ix; 527 I32 cxix = cxstack_ix;
309 PERL_CONTEXT *ccstk = cxstack; 528 PERL_CONTEXT *ccstk = cxstack;
310 PERL_SI *top_si = PL_curstackinfo; 529 PERL_SI *top_si = PL_curstackinfo;
… …
312 /* 531 /*
313 * the worst thing you can imagine happens first - we have to save 532 * the worst thing you can imagine happens first - we have to save
314 * (and reinitialize) all cv's in the whole callchain :( 533 * (and reinitialize) all cv's in the whole callchain :(
315 */ 534 */
316 535
317 PUSHs (Nullsv); 536 XPUSHs (Nullsv);
318 /* this loop was inspired by pp_caller */ 537 /* this loop was inspired by pp_caller */
319 for (;;) 538 for (;;)
320 { 539 {
321 do 540 while (expect_true (cxix >= 0))
322 { 541 {
323 PERL_CONTEXT *cx = &ccstk[cxix--]; 542 PERL_CONTEXT *cx = &ccstk[cxix--];
324 543
325 if (CxTYPE(cx) == CXt_SUB) 544 if (expect_true (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT))
326 { 545 {
327 CV *cv = cx->blk_sub.cv; 546 CV *cv = cx->blk_sub.cv;
547
328 if (CvDEPTH(cv)) 548 if (expect_true (CvDEPTH (cv)))
329 { 549 {
330#ifdef USE_THREADS
331 /*XPUSHs ((SV *)CvOWNER(cv));*/
332 /*CvOWNER(cv) = 0;*/
333 /*error must unlock this cv etc.. etc...*/
334#endif
335 EXTEND (SP, CvDEPTH(cv)*2); 550 EXTEND (SP, 3);
336
337 while (--CvDEPTH(cv))
338 {
339 /* this tells the restore code to increment CvDEPTH */
340 PUSHs (Nullsv);
341 PUSHs ((SV *)cv);
342 }
343
344 PUSHs ((SV *)CvPADLIST(cv)); 551 PUSHs ((SV *)CvPADLIST (cv));
552 PUSHs (INT2PTR (SV *, (IV)CvDEPTH (cv)));
345 PUSHs ((SV *)cv); 553 PUSHs ((SV *)cv);
346 554
347 get_padlist (cv); /* this is a monster */ 555 CvDEPTH (cv) = 0;
556 get_padlist (aTHX_ cv);
348 } 557 }
349 } 558 }
350 else if (CxTYPE(cx) == CXt_FORMAT) 559 }
560
561 if (expect_true (top_si->si_type == PERLSI_MAIN))
562 break;
563
564 top_si = top_si->si_prev;
565 ccstk = top_si->si_cxstack;
566 cxix = top_si->si_cxix;
567 }
568
569 PUTBACK;
570 }
571
572 /* allocate some space on the context stack for our purposes */
573 /* we manually unroll here, as usually 2 slots is enough */
574 if (SLOT_COUNT >= 1) CXINC;
575 if (SLOT_COUNT >= 2) CXINC;
576 if (SLOT_COUNT >= 3) CXINC;
577 {
578 int i;
579 for (i = 3; i < SLOT_COUNT; ++i)
580 CXINC;
581 }
582 cxstack_ix -= SLOT_COUNT; /* undo allocation */
583
584 c->mainstack = PL_mainstack;
585
586 {
587 perl_slots *slot = c->slot = (perl_slots *)(cxstack + cxstack_ix + 1);
588
589 slot->defav = GvAV (PL_defgv);
590 slot->defsv = DEFSV;
591 slot->errsv = ERRSV;
592 slot->irsgv = GvSV (irsgv);
593
594 #define VAR(name,type) slot->name = PL_ ## name;
595 # include "state.h"
596 #undef VAR
597 }
598}
599
600/*
601 * allocate various perl stacks. This is almost an exact copy
602 * of perl.c:init_stacks, except that it uses less memory
603 * on the (sometimes correct) assumption that coroutines do
604 * not usually need a lot of stackspace.
605 */
606#if CORO_PREFER_PERL_FUNCTIONS
607# define coro_init_stacks init_stacks
608#else
609static void
610coro_init_stacks (pTHX)
611{
612 PL_curstackinfo = new_stackinfo(32, 8);
613 PL_curstackinfo->si_type = PERLSI_MAIN;
614 PL_curstack = PL_curstackinfo->si_stack;
615 PL_mainstack = PL_curstack; /* remember in case we switch stacks */
616
617 PL_stack_base = AvARRAY(PL_curstack);
618 PL_stack_sp = PL_stack_base;
619 PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
620
621 New(50,PL_tmps_stack,32,SV*);
622 PL_tmps_floor = -1;
623 PL_tmps_ix = -1;
624 PL_tmps_max = 32;
625
626 New(54,PL_markstack,16,I32);
627 PL_markstack_ptr = PL_markstack;
628 PL_markstack_max = PL_markstack + 16;
629
630#ifdef SET_MARK_OFFSET
631 SET_MARK_OFFSET;
632#endif
633
634 New(54,PL_scopestack,8,I32);
635 PL_scopestack_ix = 0;
636 PL_scopestack_max = 8;
637
638 New(54,PL_savestack,24,ANY);
639 PL_savestack_ix = 0;
640 PL_savestack_max = 24;
641
642#if !PERL_VERSION_ATLEAST (5,10,0)
643 New(54,PL_retstack,4,OP*);
644 PL_retstack_ix = 0;
645 PL_retstack_max = 4;
646#endif
647}
648#endif
649
650/*
651 * destroy the stacks, the callchain etc...
652 */
653static void
654coro_destruct_stacks (pTHX)
655{
656 while (PL_curstackinfo->si_next)
657 PL_curstackinfo = PL_curstackinfo->si_next;
658
659 while (PL_curstackinfo)
660 {
661 PERL_SI *p = PL_curstackinfo->si_prev;
662
663 if (!IN_DESTRUCT)
664 SvREFCNT_dec (PL_curstackinfo->si_stack);
665
666 Safefree (PL_curstackinfo->si_cxstack);
667 Safefree (PL_curstackinfo);
668 PL_curstackinfo = p;
669 }
670
671 Safefree (PL_tmps_stack);
672 Safefree (PL_markstack);
673 Safefree (PL_scopestack);
674 Safefree (PL_savestack);
675#if !PERL_VERSION_ATLEAST (5,10,0)
676 Safefree (PL_retstack);
677#endif
678}
679
680static size_t
681coro_rss (pTHX_ struct coro *coro)
682{
683 size_t rss = sizeof (*coro);
684
685 if (coro->mainstack)
686 {
687 perl_slots tmp_slot;
688 perl_slots *slot;
689
690 if (coro->flags & CF_RUNNING)
691 {
692 slot = &tmp_slot;
693
694 #define VAR(name,type) slot->name = PL_ ## name;
695 # include "state.h"
696 #undef VAR
697 }
698 else
699 slot = coro->slot;
700
701 if (slot)
702 {
703 rss += sizeof (slot->curstackinfo);
704 rss += (slot->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
705 rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (slot->curstack)) * sizeof (SV *);
706 rss += slot->tmps_max * sizeof (SV *);
707 rss += (slot->markstack_max - slot->markstack_ptr) * sizeof (I32);
708 rss += slot->scopestack_max * sizeof (I32);
709 rss += slot->savestack_max * sizeof (ANY);
710
711#if !PERL_VERSION_ATLEAST (5,10,0)
712 rss += slot->retstack_max * sizeof (OP *);
713#endif
714 }
715 }
716
717 return rss;
718}
719
720/** coroutine stack handling ************************************************/
721
722static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
723static int (*orig_sigelem_set) (pTHX_ SV *sv, MAGIC *mg);
724static int (*orig_sigelem_clr) (pTHX_ SV *sv, MAGIC *mg);
725
726/* apparently < 5.8.8 */
727#ifndef MgPV_nolen_const
728#define MgPV_nolen_const(mg) (((((int)(mg)->mg_len)) == HEf_SVKEY) ? \
729 SvPV_nolen((SV*)((mg)->mg_ptr)) : \
730 (const char*)(mg)->mg_ptr)
731#endif
732
733/*
734 * This overrides the default magic get method of %SIG elements.
735 * The original one doesn't provide for reading back of PL_diehook/PL_warnhook
736 * and instead of tryign to save and restore the hash elements, we just provide
737 * readback here.
738 * We only do this when the hook is != 0, as they are often set to 0 temporarily,
739 * not expecting this to actually change the hook. This is a potential problem
740 * when a schedule happens then, but we ignore this.
741 */
742static int
743coro_sigelem_get (pTHX_ SV *sv, MAGIC *mg)
744{
745 const char *s = MgPV_nolen_const (mg);
746
747 if (*s == '_')
748 {
749 SV **svp = 0;
750
751 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
752 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
753
754 if (svp)
755 {
756 sv_setsv (sv, *svp ? *svp : &PL_sv_undef);
757 return 0;
758 }
759 }
760
761 return orig_sigelem_get ? orig_sigelem_get (aTHX_ sv, mg) : 0;
762}
763
764static int
765coro_sigelem_clr (pTHX_ SV *sv, MAGIC *mg)
766{
767 const char *s = MgPV_nolen_const (mg);
768
769 if (*s == '_')
770 {
771 SV **svp = 0;
772
773 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
774 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
775
776 if (svp)
777 {
778 SV *old = *svp;
779 *svp = 0;
780 SvREFCNT_dec (old);
781 return 0;
782 }
783 }
784
785 return orig_sigelem_clr ? orig_sigelem_clr (aTHX_ sv, mg) : 0;
786}
787
788static int
789coro_sigelem_set (pTHX_ SV *sv, MAGIC *mg)
790{
791 const char *s = MgPV_nolen_const (mg);
792
793 if (*s == '_')
794 {
795 SV **svp = 0;
796
797 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
798 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
799
800 if (svp)
801 {
802 SV *old = *svp;
803 *svp = newSVsv (sv);
804 SvREFCNT_dec (old);
805 return 0;
806 }
807 }
808
809 return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
810}
811
812static void
813prepare_nop (pTHX_ struct coro_transfer_args *ta)
814{
815 /* kind of mega-hacky, but works */
816 ta->next = ta->prev = (struct coro *)ta;
817}
818
819static int
820slf_check_nop (pTHX_ struct CoroSLF *frame)
821{
822 return 0;
823}
824
825static UNOP coro_setup_op;
826
827static void NOINLINE /* noinline to keep it out of the transfer fast path */
828coro_setup (pTHX_ struct coro *coro)
829{
830 /*
831 * emulate part of the perl startup here.
832 */
833 coro_init_stacks (aTHX);
834
835 PL_runops = RUNOPS_DEFAULT;
836 PL_curcop = &PL_compiling;
837 PL_in_eval = EVAL_NULL;
838 PL_comppad = 0;
839 PL_curpm = 0;
840 PL_curpad = 0;
841 PL_localizing = 0;
842 PL_dirty = 0;
843 PL_restartop = 0;
844#if PERL_VERSION_ATLEAST (5,10,0)
845 PL_parser = 0;
846#endif
847
848 /* recreate the die/warn hooks */
849 PL_diehook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__DIE__" , sizeof ("__DIE__" ) - 1, 1), rv_diehook );
850 PL_warnhook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__WARN__", sizeof ("__WARN__") - 1, 1), rv_warnhook);
851
852 GvSV (PL_defgv) = newSV (0);
853 GvAV (PL_defgv) = coro->args; coro->args = 0;
854 GvSV (PL_errgv) = newSV (0);
855 GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
856 PL_rs = newSVsv (GvSV (irsgv));
857 PL_defoutgv = (GV *)SvREFCNT_inc_NN (stdoutgv);
858
859 {
860 dSP;
861 UNOP myop;
862
863 Zero (&myop, 1, UNOP);
864 myop.op_next = Nullop;
865 myop.op_flags = OPf_WANT_VOID;
866
867 PUSHMARK (SP);
868 XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));
869 PUTBACK;
870 PL_op = (OP *)&myop;
871 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
872 SPAGAIN;
873 }
874
875 /* this newly created coroutine might be run on an existing cctx which most
876 * likely was suspended in pp_slf, so we have to emulate entering pp_slf here.
877 */
878 slf_frame.prepare = prepare_nop; /* provide a nop function for an eventual pp_slf */
879 slf_frame.check = slf_check_nop; /* signal pp_slf to not repeat */
880
881 /* and we have to provide the pp_slf op in any case, so pp_slf can skip it */
882 coro_setup_op.op_next = PL_op;
883 coro_setup_op.op_type = OP_CUSTOM;
884 coro_setup_op.op_ppaddr = pp_slf;
885 /* no flags required, as an init function won't be called */
886
887 PL_op = (OP *)&coro_setup_op;
888
889 /* copy throw, in case it was set before coro_setup */
890 coro_throw = coro->throw;
891}
892
893static void
894coro_destruct (pTHX_ struct coro *coro)
895{
896 if (!IN_DESTRUCT)
897 {
898 /* restore all saved variables and stuff */
899 LEAVE_SCOPE (0);
900 assert (PL_tmps_floor == -1);
901
902 /* free all temporaries */
903 FREETMPS;
904 assert (PL_tmps_ix == -1);
905
906 /* unwind all extra stacks */
907 POPSTACK_TO (PL_mainstack);
908
909 /* unwind main stack */
910 dounwind (-1);
911 }
912
913 SvREFCNT_dec (GvSV (PL_defgv));
914 SvREFCNT_dec (GvAV (PL_defgv));
915 SvREFCNT_dec (GvSV (PL_errgv));
916 SvREFCNT_dec (PL_defoutgv);
917 SvREFCNT_dec (PL_rs);
918 SvREFCNT_dec (GvSV (irsgv));
919
920 SvREFCNT_dec (PL_diehook);
921 SvREFCNT_dec (PL_warnhook);
922
923 SvREFCNT_dec (coro->saved_deffh);
924 SvREFCNT_dec (coro_throw);
925
926 coro_destruct_stacks (aTHX);
927}
928
929INLINE void
930free_coro_mortal (pTHX)
931{
932 if (expect_true (coro_mortal))
933 {
934 SvREFCNT_dec (coro_mortal);
935 coro_mortal = 0;
936 }
937}
938
939static int
940runops_trace (pTHX)
941{
942 COP *oldcop = 0;
943 int oldcxix = -2;
944 struct coro *coro = SvSTATE_current; /* trace cctx is tied to specific coro */
945 coro_cctx *cctx = coro->cctx;
946
947 while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
948 {
949 PERL_ASYNC_CHECK ();
950
951 if (cctx->flags & CC_TRACE_ALL)
952 {
953 if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
954 {
955 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
956 SV **bot, **top;
957 AV *av = newAV (); /* return values */
958 SV **cb;
959 dSP;
960
961 GV *gv = CvGV (cx->blk_sub.cv);
962 SV *fullname = sv_2mortal (newSV (0));
963 if (isGV (gv))
964 gv_efullname3 (fullname, gv, 0);
965
966 bot = PL_stack_base + cx->blk_oldsp + 1;
967 top = cx->blk_gimme == G_ARRAY ? SP + 1
968 : cx->blk_gimme == G_SCALAR ? bot + 1
969 : bot;
970
971 av_extend (av, top - bot);
972 while (bot < top)
973 av_push (av, SvREFCNT_inc_NN (*bot++));
974
975 PL_runops = RUNOPS_DEFAULT;
976 ENTER;
977 SAVETMPS;
978 EXTEND (SP, 3);
979 PUSHMARK (SP);
980 PUSHs (&PL_sv_no);
981 PUSHs (fullname);
982 PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
983 PUTBACK;
984 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
985 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
986 SPAGAIN;
987 FREETMPS;
988 LEAVE;
989 PL_runops = runops_trace;
990 }
991
992 if (oldcop != PL_curcop)
993 {
994 oldcop = PL_curcop;
995
996 if (PL_curcop != &PL_compiling)
997 {
998 SV **cb;
999
1000 if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
1001 {
1002 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
1003
1004 if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
1005 {
1006 runops_proc_t old_runops = PL_runops;
1007 dSP;
1008 GV *gv = CvGV (cx->blk_sub.cv);
1009 SV *fullname = sv_2mortal (newSV (0));
1010
1011 if (isGV (gv))
1012 gv_efullname3 (fullname, gv, 0);
1013
1014 PL_runops = RUNOPS_DEFAULT;
1015 ENTER;
1016 SAVETMPS;
1017 EXTEND (SP, 3);
1018 PUSHMARK (SP);
1019 PUSHs (&PL_sv_yes);
1020 PUSHs (fullname);
1021 PUSHs (CxHASARGS (cx) ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
1022 PUTBACK;
1023 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
1024 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
1025 SPAGAIN;
1026 FREETMPS;
1027 LEAVE;
1028 PL_runops = runops_trace;
1029 }
1030
1031 oldcxix = cxstack_ix;
1032 }
1033
1034 if (cctx->flags & CC_TRACE_LINE)
1035 {
1036 dSP;
1037
1038 PL_runops = RUNOPS_DEFAULT;
1039 ENTER;
1040 SAVETMPS;
1041 EXTEND (SP, 3);
1042 PL_runops = RUNOPS_DEFAULT;
1043 PUSHMARK (SP);
1044 PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
1045 PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
1046 PUTBACK;
1047 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
1048 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
1049 SPAGAIN;
1050 FREETMPS;
1051 LEAVE;
1052 PL_runops = runops_trace;
1053 }
1054 }
1055 }
1056 }
1057 }
1058
1059 TAINT_NOT;
1060 return 0;
1061}
1062
1063static struct coro_cctx *cctx_ssl_cctx;
1064static struct CoroSLF cctx_ssl_frame;
1065
1066static void
1067slf_prepare_set_stacklevel (pTHX_ struct coro_transfer_args *ta)
1068{
1069 ta->prev = (struct coro *)cctx_ssl_cctx;
1070 ta->next = 0;
1071}
1072
1073static int
1074slf_check_set_stacklevel (pTHX_ struct CoroSLF *frame)
1075{
1076 *frame = cctx_ssl_frame;
1077
1078 return frame->check (aTHX_ frame); /* execute the restored frame - there must be one */
1079}
1080
1081/* initialises PL_top_env and injects a pseudo-slf-call to set the stacklevel */
1082static void NOINLINE
1083cctx_prepare (pTHX_ coro_cctx *cctx)
1084{
1085 PL_top_env = &PL_start_env;
1086
1087 if (cctx->flags & CC_TRACE)
1088 PL_runops = runops_trace;
1089
1090 /* we already must be executing an SLF op, there is no other valid way
1091 * that can lead to creation of a new cctx */
1092 assert (("FATAL: can't prepare slf-less cctx in Coro module (please report)",
1093 slf_frame.prepare && PL_op->op_ppaddr == pp_slf));
1094
1095 /* we must emulate leaving pp_slf, which is done inside slf_check_set_stacklevel */
1096 cctx_ssl_cctx = cctx;
1097 cctx_ssl_frame = slf_frame;
1098
1099 slf_frame.prepare = slf_prepare_set_stacklevel;
1100 slf_frame.check = slf_check_set_stacklevel;
1101}
1102
1103/* the tail of transfer: execute stuff we can only do after a transfer */
1104INLINE void
1105transfer_tail (pTHX)
1106{
1107 free_coro_mortal (aTHX);
1108}
1109
1110/*
1111 * this is a _very_ stripped down perl interpreter ;)
1112 */
1113static void
1114cctx_run (void *arg)
1115{
1116#ifdef USE_ITHREADS
1117# if CORO_PTHREAD
1118 PERL_SET_CONTEXT (coro_thx);
1119# endif
1120#endif
1121 {
1122 dTHX;
1123
1124 /* normally we would need to skip the entersub here */
1125 /* not doing so will re-execute it, which is exactly what we want */
1126 /* PL_nop = PL_nop->op_next */
1127
1128 /* inject a fake subroutine call to cctx_init */
1129 cctx_prepare (aTHX_ (coro_cctx *)arg);
1130
1131 /* cctx_run is the alternative tail of transfer() */
1132 transfer_tail (aTHX);
1133
1134 /* somebody or something will hit me for both perl_run and PL_restartop */
1135 PL_restartop = PL_op;
1136 perl_run (PL_curinterp);
1137
1138 /*
1139 * If perl-run returns we assume exit() was being called or the coro
1140 * fell off the end, which seems to be the only valid (non-bug)
1141 * reason for perl_run to return. We try to exit by jumping to the
1142 * bootstrap-time "top" top_env, as we cannot restore the "main"
1143 * coroutine as Coro has no such concept
1144 */
1145 PL_top_env = main_top_env;
1146 JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
1147 }
1148}
1149
1150static coro_cctx *
1151cctx_new ()
1152{
1153 coro_cctx *cctx;
1154
1155 ++cctx_count;
1156 New (0, cctx, 1, coro_cctx);
1157
1158 cctx->gen = cctx_gen;
1159 cctx->flags = 0;
1160 cctx->idle_sp = 0; /* can be accessed by transfer between cctx_run and set_stacklevel, on throw */
1161
1162 return cctx;
1163}
1164
1165/* create a new cctx only suitable as source */
1166static coro_cctx *
1167cctx_new_empty ()
1168{
1169 coro_cctx *cctx = cctx_new ();
1170
1171 cctx->sptr = 0;
1172 coro_create (&cctx->cctx, 0, 0, 0, 0);
1173
1174 return cctx;
1175}
1176
1177/* create a new cctx suitable as destination/running a perl interpreter */
1178static coro_cctx *
1179cctx_new_run ()
1180{
1181 coro_cctx *cctx = cctx_new ();
1182 void *stack_start;
1183 size_t stack_size;
1184
1185#if HAVE_MMAP
1186 cctx->ssize = ((cctx_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
1187 /* mmap supposedly does allocate-on-write for us */
1188 cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
1189
1190 if (cctx->sptr != (void *)-1)
1191 {
1192 #if CORO_STACKGUARD
1193 mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
1194 #endif
1195 stack_start = (char *)cctx->sptr + CORO_STACKGUARD * PAGESIZE;
1196 stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
1197 cctx->flags |= CC_MAPPED;
1198 }
1199 else
1200#endif
1201 {
1202 cctx->ssize = cctx_stacksize * (long)sizeof (long);
1203 New (0, cctx->sptr, cctx_stacksize, long);
1204
1205 if (!cctx->sptr)
1206 {
1207 perror ("FATAL: unable to allocate stack for coroutine, exiting.");
1208 _exit (EXIT_FAILURE);
1209 }
1210
1211 stack_start = cctx->sptr;
1212 stack_size = cctx->ssize;
1213 }
1214
1215 #if CORO_USE_VALGRIND
1216 cctx->valgrind_id = VALGRIND_STACK_REGISTER ((char *)stack_start, (char *)stack_start + stack_size);
1217 #endif
1218
1219 coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);
1220
1221 return cctx;
1222}
1223
1224static void
1225cctx_destroy (coro_cctx *cctx)
1226{
1227 if (!cctx)
1228 return;
1229
1230 --cctx_count;
1231 coro_destroy (&cctx->cctx);
1232
1233 /* coro_transfer creates new, empty cctx's */
1234 if (cctx->sptr)
1235 {
1236 #if CORO_USE_VALGRIND
1237 VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
1238 #endif
1239
1240#if HAVE_MMAP
1241 if (cctx->flags & CC_MAPPED)
1242 munmap (cctx->sptr, cctx->ssize);
1243 else
1244#endif
1245 Safefree (cctx->sptr);
1246 }
1247
1248 Safefree (cctx);
1249}
1250
1251/* wether this cctx should be destructed */
1252#define CCTX_EXPIRED(cctx) ((cctx)->gen != cctx_gen || ((cctx)->flags & CC_NOREUSE))
1253
1254static coro_cctx *
1255cctx_get (pTHX)
1256{
1257 while (expect_true (cctx_first))
1258 {
1259 coro_cctx *cctx = cctx_first;
1260 cctx_first = cctx->next;
1261 --cctx_idle;
1262
1263 if (expect_true (!CCTX_EXPIRED (cctx)))
1264 return cctx;
1265
1266 cctx_destroy (cctx);
1267 }
1268
1269 return cctx_new_run ();
1270}
1271
1272static void
1273cctx_put (coro_cctx *cctx)
1274{
1275 assert (("FATAL: cctx_put called on non-initialised cctx in Coro (please report)", cctx->sptr));
1276
1277 /* free another cctx if overlimit */
1278 if (expect_false (cctx_idle >= cctx_max_idle))
1279 {
1280 coro_cctx *first = cctx_first;
1281 cctx_first = first->next;
1282 --cctx_idle;
1283
1284 cctx_destroy (first);
1285 }
1286
1287 ++cctx_idle;
1288 cctx->next = cctx_first;
1289 cctx_first = cctx;
1290}
1291
1292/** coroutine switching *****************************************************/
1293
1294static void
1295transfer_check (pTHX_ struct coro *prev, struct coro *next)
1296{
1297 /* TODO: throwing up here is considered harmful */
1298
1299 if (expect_true (prev != next))
1300 {
1301 if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
1302 croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states,");
1303
1304 if (expect_false (next->flags & CF_RUNNING))
1305 croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states,");
1306
1307 if (expect_false (next->flags & CF_DESTROYED))
1308 croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states,");
1309
1310#if !PERL_VERSION_ATLEAST (5,10,0)
1311 if (expect_false (PL_lex_state != LEX_NOTPARSING))
1312 croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version,");
1313#endif
1314 }
1315}
1316
1317/* always use the TRANSFER macro */
1318static void NOINLINE /* noinline so we have a fixed stackframe */
1319transfer (pTHX_ struct coro *prev, struct coro *next, int force_cctx)
1320{
1321 dSTACKLEVEL;
1322
1323 /* sometimes transfer is only called to set idle_sp */
1324 if (expect_false (!next))
1325 {
1326 ((coro_cctx *)prev)->idle_sp = STACKLEVEL;
1327 assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
1328 }
1329 else if (expect_true (prev != next))
1330 {
1331 coro_cctx *prev__cctx;
1332
1333 if (expect_false (prev->flags & CF_NEW))
1334 {
1335 /* create a new empty/source context */
1336 prev->cctx = cctx_new_empty ();
1337 prev->flags &= ~CF_NEW;
1338 prev->flags |= CF_RUNNING;
1339 }
1340
1341 prev->flags &= ~CF_RUNNING;
1342 next->flags |= CF_RUNNING;
1343
1344 /* first get rid of the old state */
1345 save_perl (aTHX_ prev);
1346
1347 if (expect_false (next->flags & CF_NEW))
1348 {
1349 /* need to start coroutine */
1350 next->flags &= ~CF_NEW;
1351 /* setup coroutine call */
1352 coro_setup (aTHX_ next);
1353 }
1354 else
1355 load_perl (aTHX_ next);
1356
1357 prev__cctx = prev->cctx;
1358
1359 /* possibly untie and reuse the cctx */
1360 if (expect_true (
1361 prev__cctx->idle_sp == STACKLEVEL
1362 && !(prev__cctx->flags & CC_TRACE)
1363 && !force_cctx
1364 ))
1365 {
1366 /* I assume that stacklevel is a stronger indicator than PL_top_env changes */
1367 assert (("FATAL: current top_env must equal previous top_env in Coro (please report)", PL_top_env == prev__cctx->idle_te));
1368
1369 prev->cctx = 0;
1370
1371 /* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
1372 /* without this the next cctx_get might destroy the prev__cctx while still in use */
1373 if (expect_false (CCTX_EXPIRED (prev__cctx)))
1374 if (!next->cctx)
1375 next->cctx = cctx_get (aTHX);
1376
1377 cctx_put (prev__cctx);
1378 }
1379
1380 ++next->usecount;
1381
1382 if (expect_true (!next->cctx))
1383 next->cctx = cctx_get (aTHX);
1384
1385 if (expect_false (prev__cctx != next->cctx))
1386 {
1387 prev__cctx->top_env = PL_top_env;
1388 PL_top_env = next->cctx->top_env;
1389 coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
1390 }
1391
1392 transfer_tail (aTHX);
1393 }
1394}
1395
1396#define TRANSFER(ta, force_cctx) transfer (aTHX_ (ta).prev, (ta).next, (force_cctx))
1397#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
1398
1399/** high level stuff ********************************************************/
1400
1401static int
1402coro_state_destroy (pTHX_ struct coro *coro)
1403{
1404 if (coro->flags & CF_DESTROYED)
1405 return 0;
1406
1407 if (coro->on_destroy)
1408 coro->on_destroy (aTHX_ coro);
1409
1410 coro->flags |= CF_DESTROYED;
1411
1412 if (coro->flags & CF_READY)
1413 {
1414 /* reduce nready, as destroying a ready coro effectively unreadies it */
1415 /* alternative: look through all ready queues and remove the coro */
1416 --coro_nready;
1417 }
1418 else
1419 coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
1420
1421 if (coro->mainstack && coro->mainstack != main_mainstack)
1422 {
1423 struct coro temp;
1424
1425 assert (("FATAL: tried to destroy currently running coroutine (please report)", !(coro->flags & CF_RUNNING)));
1426
1427 save_perl (aTHX_ &temp);
1428 load_perl (aTHX_ coro);
1429
1430 coro_destruct (aTHX_ coro);
1431
1432 load_perl (aTHX_ &temp);
1433
1434 coro->slot = 0;
1435 }
1436
1437 cctx_destroy (coro->cctx);
1438 SvREFCNT_dec (coro->args);
1439
1440 if (coro->next) coro->next->prev = coro->prev;
1441 if (coro->prev) coro->prev->next = coro->next;
1442 if (coro == coro_first) coro_first = coro->next;
1443
1444 return 1;
1445}
1446
1447static int
1448coro_state_free (pTHX_ SV *sv, MAGIC *mg)
1449{
1450 struct coro *coro = (struct coro *)mg->mg_ptr;
1451 mg->mg_ptr = 0;
1452
1453 coro->hv = 0;
1454
1455 if (--coro->refcnt < 0)
1456 {
1457 coro_state_destroy (aTHX_ coro);
1458 Safefree (coro);
1459 }
1460
1461 return 0;
1462}
1463
1464static int
1465coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
1466{
1467 struct coro *coro = (struct coro *)mg->mg_ptr;
1468
1469 ++coro->refcnt;
1470
1471 return 0;
1472}
1473
1474static MGVTBL coro_state_vtbl = {
1475 0, 0, 0, 0,
1476 coro_state_free,
1477 0,
1478#ifdef MGf_DUP
1479 coro_state_dup,
1480#else
1481# define MGf_DUP 0
1482#endif
1483};
1484
1485static void
1486prepare_transfer (pTHX_ struct coro_transfer_args *ta, SV *prev_sv, SV *next_sv)
1487{
1488 ta->prev = SvSTATE (prev_sv);
1489 ta->next = SvSTATE (next_sv);
1490 TRANSFER_CHECK (*ta);
1491}
1492
1493static void
1494api_transfer (pTHX_ SV *prev_sv, SV *next_sv)
1495{
1496 struct coro_transfer_args ta;
1497
1498 prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
1499 TRANSFER (ta, 1);
1500}
1501
1502/** Coro ********************************************************************/
1503
1504INLINE void
1505coro_enq (pTHX_ struct coro *coro)
1506{
1507 av_push (coro_ready [coro->prio - PRIO_MIN], SvREFCNT_inc_NN (coro->hv));
1508}
1509
1510INLINE SV *
1511coro_deq (pTHX)
1512{
1513 int prio;
1514
1515 for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
1516 if (AvFILLp (coro_ready [prio]) >= 0)
1517 return av_shift (coro_ready [prio]);
1518
1519 return 0;
1520}
1521
1522static int
1523api_ready (pTHX_ SV *coro_sv)
1524{
1525 struct coro *coro;
1526 SV *sv_hook;
1527 void (*xs_hook)(void);
1528
1529 if (SvROK (coro_sv))
1530 coro_sv = SvRV (coro_sv);
1531
1532 coro = SvSTATE (coro_sv);
1533
1534 if (coro->flags & CF_READY)
1535 return 0;
1536
1537 coro->flags |= CF_READY;
1538
1539 sv_hook = coro_nready ? 0 : coro_readyhook;
1540 xs_hook = coro_nready ? 0 : coroapi.readyhook;
1541
1542 coro_enq (aTHX_ coro);
1543 ++coro_nready;
1544
1545 if (sv_hook)
1546 {
1547 dSP;
1548
1549 ENTER;
1550 SAVETMPS;
1551
1552 PUSHMARK (SP);
1553 PUTBACK;
1554 call_sv (sv_hook, G_VOID | G_DISCARD);
1555
1556 FREETMPS;
1557 LEAVE;
1558 }
1559
1560 if (xs_hook)
1561 xs_hook ();
1562
1563 return 1;
1564}
1565
1566static int
1567api_is_ready (pTHX_ SV *coro_sv)
1568{
1569 return !!(SvSTATE (coro_sv)->flags & CF_READY);
1570}
1571
1572INLINE void
1573prepare_schedule (pTHX_ struct coro_transfer_args *ta)
1574{
1575 SV *prev_sv, *next_sv;
1576
1577 for (;;)
1578 {
1579 next_sv = coro_deq (aTHX);
1580
1581 /* nothing to schedule: call the idle handler */
1582 if (expect_false (!next_sv))
1583 {
1584 dSP;
1585
1586 ENTER;
1587 SAVETMPS;
1588
1589 PUSHMARK (SP);
1590 PUTBACK;
1591 call_sv (get_sv ("Coro::idle", FALSE), G_VOID | G_DISCARD);
1592
1593 FREETMPS;
1594 LEAVE;
1595 continue;
1596 }
1597
1598 ta->next = SvSTATE_hv (next_sv);
1599
1600 /* cannot transfer to destroyed coros, skip and look for next */
1601 if (expect_false (ta->next->flags & CF_DESTROYED))
1602 {
1603 SvREFCNT_dec (next_sv);
1604 /* coro_nready has already been taken care of by destroy */
1605 continue;
1606 }
1607
1608 --coro_nready;
1609 break;
1610 }
1611
1612 /* free this only after the transfer */
1613 prev_sv = SvRV (coro_current);
1614 ta->prev = SvSTATE_hv (prev_sv);
1615 TRANSFER_CHECK (*ta);
1616 assert (("FATAL: next coroutine isn't marked as ready in Coro (please report)", ta->next->flags & CF_READY));
1617 ta->next->flags &= ~CF_READY;
1618 SvRV_set (coro_current, next_sv);
1619
1620 free_coro_mortal (aTHX);
1621 coro_mortal = prev_sv;
1622}
1623
1624INLINE void
1625prepare_cede (pTHX_ struct coro_transfer_args *ta)
1626{
1627 api_ready (aTHX_ coro_current);
1628 prepare_schedule (aTHX_ ta);
1629}
1630
1631INLINE void
1632prepare_cede_notself (pTHX_ struct coro_transfer_args *ta)
1633{
1634 SV *prev = SvRV (coro_current);
1635
1636 if (coro_nready)
1637 {
1638 prepare_schedule (aTHX_ ta);
1639 api_ready (aTHX_ prev);
1640 }
1641 else
1642 prepare_nop (aTHX_ ta);
1643}
1644
1645static void
1646api_schedule (pTHX)
1647{
1648 struct coro_transfer_args ta;
1649
1650 prepare_schedule (aTHX_ &ta);
1651 TRANSFER (ta, 1);
1652}
1653
1654static int
1655api_cede (pTHX)
1656{
1657 struct coro_transfer_args ta;
1658
1659 prepare_cede (aTHX_ &ta);
1660
1661 if (expect_true (ta.prev != ta.next))
1662 {
1663 TRANSFER (ta, 1);
1664 return 1;
1665 }
1666 else
1667 return 0;
1668}
1669
1670static int
1671api_cede_notself (pTHX)
1672{
1673 if (coro_nready)
1674 {
1675 struct coro_transfer_args ta;
1676
1677 prepare_cede_notself (aTHX_ &ta);
1678 TRANSFER (ta, 1);
1679 return 1;
1680 }
1681 else
1682 return 0;
1683}
1684
1685static void
1686api_trace (pTHX_ SV *coro_sv, int flags)
1687{
1688 struct coro *coro = SvSTATE (coro_sv);
1689
1690 if (flags & CC_TRACE)
1691 {
1692 if (!coro->cctx)
1693 coro->cctx = cctx_new_run ();
1694 else if (!(coro->cctx->flags & CC_TRACE))
1695 croak ("cannot enable tracing on coroutine with custom stack,");
1696
1697 coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
1698 }
1699 else if (coro->cctx && coro->cctx->flags & CC_TRACE)
1700 {
1701 coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
1702
1703 if (coro->flags & CF_RUNNING)
1704 PL_runops = RUNOPS_DEFAULT;
1705 else
1706 coro->slot->runops = RUNOPS_DEFAULT;
1707 }
1708}
1709
1710/*****************************************************************************/
1711/* schedule-like-function opcode (SLF) */
1712
1713static UNOP slf_restore; /* restore stack as entersub did, for first-re-run */
1714static const CV *slf_cv;
1715static SV **slf_argv;
1716static int slf_argc, slf_arga; /* count, allocated */
1717static I32 slf_ax; /* top of stack, for restore */
1718
1719/* this restores the stack in the case we patched the entersub, to */
1720/* recreate the stack frame as perl will on following calls */
1721/* since entersub cleared the stack */
1722static OP *
1723pp_restore (pTHX)
1724{
1725 int i;
1726 SV **SP = PL_stack_base + slf_ax;
1727
1728 PUSHMARK (SP);
1729
1730 EXTEND (SP, slf_argc + 1);
1731
1732 for (i = 0; i < slf_argc; ++i)
1733 PUSHs (sv_2mortal (slf_argv [i]));
1734
1735 PUSHs ((SV *)CvGV (slf_cv));
1736
1737 RETURNOP (slf_restore.op_first);
1738}
1739
1740static void
1741slf_prepare_transfer (pTHX_ struct coro_transfer_args *ta)
1742{
1743 SV **arg = (SV **)slf_frame.data;
1744
1745 prepare_transfer (aTHX_ ta, arg [0], arg [1]);
1746}
1747
1748static void
1749slf_init_transfer (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1750{
1751 if (items != 2)
1752 croak ("Coro::State::transfer (prev, next) expects two arguments, not %d,", items);
1753
1754 frame->prepare = slf_prepare_transfer;
1755 frame->check = slf_check_nop;
1756 frame->data = (void *)arg; /* let's hope it will stay valid */
1757}
1758
1759static void
1760slf_init_schedule (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1761{
1762 frame->prepare = prepare_schedule;
1763 frame->check = slf_check_nop;
1764}
1765
1766static void
1767slf_init_cede (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1768{
1769 frame->prepare = prepare_cede;
1770 frame->check = slf_check_nop;
1771}
1772
1773static void
1774slf_init_cede_notself (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1775{
1776 frame->prepare = prepare_cede_notself;
1777 frame->check = slf_check_nop;
1778}
1779
1780/*
1781 * these not obviously related functions are all rolled into one
1782 * function to increase chances that they all will call transfer with the same
1783 * stack offset
1784 * SLF stands for "schedule-like-function".
1785 */
1786static OP *
1787pp_slf (pTHX)
1788{
1789 I32 checkmark; /* mark SP to see how many elements check has pushed */
1790
1791 /* set up the slf frame, unless it has already been set-up */
1792 /* the latter happens when a new coro has been started */
1793 /* or when a new cctx was attached to an existing coroutine */
1794 if (expect_true (!slf_frame.prepare))
1795 {
1796 /* first iteration */
1797 dSP;
1798 SV **arg = PL_stack_base + TOPMARK + 1;
1799 int items = SP - arg; /* args without function object */
1800 SV *gv = *sp;
1801
1802 /* do a quick consistency check on the "function" object, and if it isn't */
1803 /* for us, divert to the real entersub */
1804 if (SvTYPE (gv) != SVt_PVGV
1805 || !GvCV (gv)
1806 || !(CvFLAGS (GvCV (gv)) & CVf_SLF))
1807 return PL_ppaddr[OP_ENTERSUB](aTHX);
1808
1809 if (!(PL_op->op_flags & OPf_STACKED))
1810 {
1811 /* ampersand-form of call, use @_ instead of stack */
1812 AV *av = GvAV (PL_defgv);
1813 arg = AvARRAY (av);
1814 items = AvFILLp (av) + 1;
1815 }
1816
1817 /* now call the init function, which needs to set up slf_frame */
1818 ((coro_slf_cb)CvXSUBANY (GvCV (gv)).any_ptr)
1819 (aTHX_ &slf_frame, GvCV (gv), arg, items);
1820
1821 /* pop args */
1822 SP = PL_stack_base + POPMARK;
1823
1824 PUTBACK;
1825 }
1826
1827 /* now that we have a slf_frame, interpret it! */
1828 /* we use a callback system not to make the code needlessly */
1829 /* complicated, but so we can run multiple perl coros from one cctx */
1830
1831 do
1832 {
1833 struct coro_transfer_args ta;
1834
1835 slf_frame.prepare (aTHX_ &ta);
1836 TRANSFER (ta, 0);
1837
1838 checkmark = PL_stack_sp - PL_stack_base;
1839 }
1840 while (slf_frame.check (aTHX_ &slf_frame));
1841
1842 slf_frame.prepare = 0; /* invalidate the frame, we are done processing it */
1843
1844 /* return value handling - mostly like entersub */
1845 /* make sure we put something on the stack in scalar context */
1846 if (GIMME_V == G_SCALAR)
1847 {
1848 dSP;
1849 SV **bot = PL_stack_base + checkmark;
1850
1851 if (sp == bot) /* too few, push undef */
1852 bot [1] = &PL_sv_undef;
1853 else if (sp != bot + 1) /* too many, take last one */
1854 bot [1] = *sp;
1855
1856 SP = bot + 1;
1857
1858 PUTBACK;
1859 }
1860
1861 /* exception handling */
1862 if (expect_false (coro_throw))
1863 {
1864 SV *exception = sv_2mortal (coro_throw);
1865
1866 coro_throw = 0;
1867 sv_setsv (ERRSV, exception);
1868 croak (0);
1869 }
1870
1871 return NORMAL;
1872}
1873
1874static void
1875api_execute_slf (pTHX_ CV *cv, coro_slf_cb init_cb, I32 ax)
1876{
1877 int i;
1878 SV **arg = PL_stack_base + ax;
1879 int items = PL_stack_sp - arg + 1;
1880
1881 assert (("FATAL: SLF call with illegal CV value", !CvANON (cv)));
1882
1883 if (PL_op->op_ppaddr != PL_ppaddr [OP_ENTERSUB]
1884 && PL_op->op_ppaddr != pp_slf)
1885 croak ("FATAL: Coro SLF calls can only be made normally, not via goto or any other means, caught");
1886
1887 CvFLAGS (cv) |= CVf_SLF;
1888 CvXSUBANY (cv).any_ptr = (void *)init_cb;
1889 slf_cv = cv;
1890
1891 /* we patch the op, and then re-run the whole call */
1892 /* we have to put the same argument on the stack for this to work */
1893 /* and this will be done by pp_restore */
1894 slf_restore.op_next = (OP *)&slf_restore;
1895 slf_restore.op_type = OP_CUSTOM;
1896 slf_restore.op_ppaddr = pp_restore;
1897 slf_restore.op_first = PL_op;
1898
1899 slf_ax = ax - 1; /* undo the ax++ inside dAXMARK */
1900
1901 if (PL_op->op_flags & OPf_STACKED)
1902 {
1903 if (items > slf_arga)
1904 {
1905 slf_arga = items;
1906 free (slf_argv);
1907 slf_argv = malloc (slf_arga * sizeof (SV *));
1908 }
1909
1910 slf_argc = items;
1911
1912 for (i = 0; i < items; ++i)
1913 slf_argv [i] = SvREFCNT_inc (arg [i]);
1914 }
1915 else
1916 slf_argc = 0;
1917
1918 PL_op->op_ppaddr = pp_slf;
1919 PL_op->op_type = OP_CUSTOM; /* maybe we should leave it at entersub? */
1920
1921 PL_op = (OP *)&slf_restore;
1922}
1923
1924/*****************************************************************************/
1925/* PerlIO::cede */
1926
1927typedef struct
1928{
1929 PerlIOBuf base;
1930 NV next, every;
1931} PerlIOCede;
1932
1933static IV
1934PerlIOCede_pushed (pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
1935{
1936 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
1937
1938 self->every = SvCUR (arg) ? SvNV (arg) : 0.01;
1939 self->next = nvtime () + self->every;
1940
1941 return PerlIOBuf_pushed (aTHX_ f, mode, Nullsv, tab);
1942}
1943
1944static SV *
1945PerlIOCede_getarg (pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
1946{
1947 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
1948
1949 return newSVnv (self->every);
1950}
1951
1952static IV
1953PerlIOCede_flush (pTHX_ PerlIO *f)
1954{
1955 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
1956 double now = nvtime ();
1957
1958 if (now >= self->next)
1959 {
1960 api_cede (aTHX);
1961 self->next = now + self->every;
1962 }
1963
1964 return PerlIOBuf_flush (aTHX_ f);
1965}
1966
1967static PerlIO_funcs PerlIO_cede =
1968{
1969 sizeof(PerlIO_funcs),
1970 "cede",
1971 sizeof(PerlIOCede),
1972 PERLIO_K_DESTRUCT | PERLIO_K_RAW,
1973 PerlIOCede_pushed,
1974 PerlIOBuf_popped,
1975 PerlIOBuf_open,
1976 PerlIOBase_binmode,
1977 PerlIOCede_getarg,
1978 PerlIOBase_fileno,
1979 PerlIOBuf_dup,
1980 PerlIOBuf_read,
1981 PerlIOBuf_unread,
1982 PerlIOBuf_write,
1983 PerlIOBuf_seek,
1984 PerlIOBuf_tell,
1985 PerlIOBuf_close,
1986 PerlIOCede_flush,
1987 PerlIOBuf_fill,
1988 PerlIOBase_eof,
1989 PerlIOBase_error,
1990 PerlIOBase_clearerr,
1991 PerlIOBase_setlinebuf,
1992 PerlIOBuf_get_base,
1993 PerlIOBuf_bufsiz,
1994 PerlIOBuf_get_ptr,
1995 PerlIOBuf_get_cnt,
1996 PerlIOBuf_set_ptrcnt,
1997};
1998
1999/*****************************************************************************/
2000/* Coro::Semaphore */
2001
2002static void
2003coro_semaphore_adjust (pTHX_ AV *av, IV adjust)
2004{
2005 SV *count_sv = AvARRAY (av)[0];
2006 IV count = SvIVX (count_sv);
2007
2008 count += adjust;
2009 SvIVX (count_sv) = count;
2010
2011 /* now wake up as many waiters as are expected to lock */
2012 while (count > 0 && AvFILLp (av) > 0)
2013 {
2014 SV *cb;
2015
2016 /* swap first two elements so we can shift a waiter */
2017 AvARRAY (av)[0] = AvARRAY (av)[1];
2018 AvARRAY (av)[1] = count_sv;
2019 cb = av_shift (av);
2020
2021 if (SvOBJECT (cb))
2022 api_ready (aTHX_ cb);
2023 else
2024 croak ("callbacks not yet supported");
2025
2026 SvREFCNT_dec (cb);
2027
2028 --count;
2029 }
2030}
2031
2032static void
2033coro_semaphore_on_destroy (pTHX_ struct coro *coro)
2034{
2035 /* call $sem->adjust (0) to possibly wake up some other waiters */
2036 coro_semaphore_adjust (aTHX_ (AV *)coro->slf_frame.data, 0);
2037}
2038
2039static int
2040slf_check_semaphore_down (pTHX_ struct CoroSLF *frame)
2041{
2042 AV *av = (AV *)frame->data;
2043 SV *count_sv = AvARRAY (av)[0];
2044
2045 if (SvIVX (count_sv) > 0)
2046 {
2047 SvSTATE_current->on_destroy = 0;
2048 SvIVX (count_sv) = SvIVX (count_sv) - 1;
2049 return 0;
2050 }
2051 else
2052 {
2053 int i;
2054 /* if we were woken up but can't down, we look through the whole */
2055 /* waiters list and only add us if we aren't in there already */
2056 /* this avoids some degenerate memory usage cases */
2057
2058 for (i = 1; i <= AvFILLp (av); ++i)
2059 if (AvARRAY (av)[i] == SvRV (coro_current))
2060 return 1;
2061
2062 av_push (av, SvREFCNT_inc (SvRV (coro_current)));
2063 return 1;
2064 }
2065}
2066
2067static void
2068slf_init_semaphore_down (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2069{
2070 AV *av = (AV *)SvRV (arg [0]);
2071
2072 if (SvIVX (AvARRAY (av)[0]) > 0)
2073 {
2074 frame->data = (void *)av;
2075 frame->prepare = prepare_nop;
2076 SvSTATE_current->on_destroy = coro_semaphore_on_destroy;
2077 }
2078 else
2079 {
2080 av_push (av, SvREFCNT_inc (SvRV (coro_current)));
2081
2082 frame->data = (void *)sv_2mortal (SvREFCNT_inc ((SV *)av));
2083 frame->prepare = prepare_schedule;
2084
2085 /* to avoid race conditions when a woken-up coro gets terminated */
2086 /* we arrange for a temporary on_destroy that calls adjust (0) */
2087 assert (!SvSTATE_current->on_destroy);//D
2088 SvSTATE_current->on_destroy = coro_semaphore_on_destroy;
2089 }
2090
2091 frame->check = slf_check_semaphore_down;
2092
2093}
2094
2095/*****************************************************************************/
2096/* gensub: simple closure generation utility */
2097
2098#define GENSUB_ARG CvXSUBANY (cv).any_ptr
2099
2100/* create a closure from XS, returns a code reference */
2101/* the arg can be accessed via GENSUB_ARG from the callback */
2102/* the callback must use dXSARGS/XSRETURN */
2103static SV *
2104gensub (pTHX_ void (*xsub)(pTHX_ CV *), void *arg)
2105{
2106 CV *cv = (CV *)newSV (0);
2107
2108 sv_upgrade ((SV *)cv, SVt_PVCV);
2109
2110 CvANON_on (cv);
2111 CvISXSUB_on (cv);
2112 CvXSUB (cv) = xsub;
2113 GENSUB_ARG = arg;
2114
2115 return newRV_noinc ((SV *)cv);
2116}
2117
2118/*****************************************************************************/
2119/* Coro::AIO */
2120
2121#define CORO_MAGIC_type_aio PERL_MAGIC_ext
2122
2123/* helper storage struct */
2124struct io_state
2125{
2126 int errorno;
2127 I32 laststype; /* U16 in 5.10.0 */
2128 int laststatval;
2129 Stat_t statcache;
2130};
2131
2132static void
2133coro_aio_callback (pTHX_ CV *cv)
2134{
2135 dXSARGS;
2136 AV *state = (AV *)GENSUB_ARG;
2137 SV *coro = av_pop (state);
2138 SV *data_sv = newSV (sizeof (struct io_state));
2139
2140 av_extend (state, items);
2141
2142 sv_upgrade (data_sv, SVt_PV);
2143 SvCUR_set (data_sv, sizeof (struct io_state));
2144 SvPOK_only (data_sv);
2145
2146 {
2147 struct io_state *data = (struct io_state *)SvPVX (data_sv);
2148
2149 data->errorno = errno;
2150 data->laststype = PL_laststype;
2151 data->laststatval = PL_laststatval;
2152 data->statcache = PL_statcache;
2153 }
2154
2155 /* now build the result vector out of all the parameters and the data_sv */
2156 {
2157 int i;
2158
2159 for (i = 0; i < items; ++i)
2160 av_push (state, SvREFCNT_inc_NN (ST (i)));
2161 }
2162
2163 av_push (state, data_sv);
2164
2165 api_ready (aTHX_ coro);
2166 SvREFCNT_dec (coro);
2167 SvREFCNT_dec ((AV *)state);
2168}
2169
2170static int
2171slf_check_aio_req (pTHX_ struct CoroSLF *frame)
2172{
2173 AV *state = (AV *)frame->data;
2174
2175 /* one element that is an RV? repeat! */
2176 if (AvFILLp (state) == 0 && SvROK (AvARRAY (state)[0]))
2177 return 1;
2178
2179 /* restore status */
2180 {
2181 SV *data_sv = av_pop (state);
2182 struct io_state *data = (struct io_state *)SvPVX (data_sv);
2183
2184 errno = data->errorno;
2185 PL_laststype = data->laststype;
2186 PL_laststatval = data->laststatval;
2187 PL_statcache = data->statcache;
2188
2189 SvREFCNT_dec (data_sv);
2190 }
2191
2192 /* push result values */
2193 {
2194 dSP;
2195 int i;
2196
2197 EXTEND (SP, AvFILLp (state) + 1);
2198 for (i = 0; i <= AvFILLp (state); ++i)
2199 PUSHs (sv_2mortal (SvREFCNT_inc_NN (AvARRAY (state)[i])));
2200
2201 PUTBACK;
2202 }
2203
2204 return 0;
2205}
2206
2207static void
2208slf_init_aio_req (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2209{
2210 AV *state = (AV *)sv_2mortal ((SV *)newAV ());
2211 SV *coro_hv = SvRV (coro_current);
2212 struct coro *coro = SvSTATE_hv (coro_hv);
2213
2214 /* put our coroutine id on the state arg */
2215 av_push (state, SvREFCNT_inc_NN (coro_hv));
2216
2217 /* first see whether we have a non-zero priority and set it as AIO prio */
2218 if (coro->prio)
2219 {
2220 dSP;
2221
2222 static SV *prio_cv;
2223 static SV *prio_sv;
2224
2225 if (expect_false (!prio_cv))
2226 {
2227 prio_cv = (SV *)get_cv ("IO::AIO::aioreq_pri", 0);
2228 prio_sv = newSViv (0);
2229 }
2230
2231 PUSHMARK (SP);
2232 sv_setiv (prio_sv, coro->prio);
2233 XPUSHs (prio_sv);
2234
2235 PUTBACK;
2236 call_sv (prio_cv, G_VOID | G_DISCARD);
2237 }
2238
2239 /* now call the original request */
2240 {
2241 dSP;
2242 CV *req = (CV *)CORO_MAGIC_NN ((SV *)cv, CORO_MAGIC_type_aio)->mg_obj;
2243 int i;
2244
2245 PUSHMARK (SP);
2246
2247 /* first push all args to the stack */
2248 EXTEND (SP, items + 1);
2249
2250 for (i = 0; i < items; ++i)
2251 PUSHs (arg [i]);
2252
2253 /* now push the callback closure */
2254 PUSHs (sv_2mortal (gensub (aTHX_ coro_aio_callback, (void *)SvREFCNT_inc_NN ((SV *)state))));
2255
2256 /* now call the AIO function - we assume our request is uncancelable */
2257 PUTBACK;
2258 call_sv ((SV *)req, G_VOID | G_DISCARD);
2259 }
2260
2261 /* now that the requets is going, we loop toll we have a result */
2262 frame->data = (void *)state;
2263 frame->prepare = prepare_schedule;
2264 frame->check = slf_check_aio_req;
2265}
2266
2267static void
2268coro_aio_req_xs (pTHX_ CV *cv)
2269{
2270 dXSARGS;
2271
2272 CORO_EXECUTE_SLF_XS (slf_init_aio_req);
2273
2274 XSRETURN_EMPTY;
2275}
2276
2277/*****************************************************************************/
2278
2279MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
2280
2281PROTOTYPES: DISABLE
2282
2283BOOT:
2284{
2285#ifdef USE_ITHREADS
2286# if CORO_PTHREAD
2287 coro_thx = PERL_GET_CONTEXT;
2288# endif
2289#endif
2290 BOOT_PAGESIZE;
2291
2292 irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
2293 stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
2294
2295 orig_sigelem_get = PL_vtbl_sigelem.svt_get; PL_vtbl_sigelem.svt_get = coro_sigelem_get;
2296 orig_sigelem_set = PL_vtbl_sigelem.svt_set; PL_vtbl_sigelem.svt_set = coro_sigelem_set;
2297 orig_sigelem_clr = PL_vtbl_sigelem.svt_clear; PL_vtbl_sigelem.svt_clear = coro_sigelem_clr;
2298
2299 hv_sig = coro_get_hv (aTHX_ "SIG", TRUE);
2300 rv_diehook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::diehook" , 0, SVt_PVCV));
2301 rv_warnhook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::warnhook", 0, SVt_PVCV));
2302
2303 coro_state_stash = gv_stashpv ("Coro::State", TRUE);
2304
2305 newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
2306 newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
2307 newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
2308 newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
2309
2310 main_mainstack = PL_mainstack;
2311 main_top_env = PL_top_env;
2312
2313 while (main_top_env->je_prev)
2314 main_top_env = main_top_env->je_prev;
2315
2316 {
2317 SV *slf = sv_2mortal (newSViv (PTR2IV (pp_slf)));
2318
2319 if (!PL_custom_op_names) PL_custom_op_names = newHV ();
2320 hv_store_ent (PL_custom_op_names, slf,
2321 newSVpv ("coro_slf", 0), 0);
2322
2323 if (!PL_custom_op_descs) PL_custom_op_descs = newHV ();
2324 hv_store_ent (PL_custom_op_descs, slf,
2325 newSVpv ("coro schedule like function", 0), 0);
2326 }
2327
2328 coroapi.ver = CORO_API_VERSION;
2329 coroapi.rev = CORO_API_REVISION;
2330
2331 coroapi.transfer = api_transfer;
2332
2333 coroapi.sv_state = SvSTATE_;
2334 coroapi.execute_slf = api_execute_slf;
2335 coroapi.prepare_nop = prepare_nop;
2336 coroapi.prepare_schedule = prepare_schedule;
2337 coroapi.prepare_cede = prepare_cede;
2338 coroapi.prepare_cede_notself = prepare_cede_notself;
2339
2340 {
2341 SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0);
2342
2343 if (!svp) croak ("Time::HiRes is required");
2344 if (!SvIOK (*svp)) croak ("Time::NVtime isn't a function pointer");
2345
2346 nvtime = INT2PTR (double (*)(), SvIV (*svp));
2347 }
2348
2349 assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
2350}
2351
2352SV *
2353new (char *klass, ...)
2354 CODE:
2355{
2356 struct coro *coro;
2357 MAGIC *mg;
2358 HV *hv;
2359 int i;
2360
2361 Newz (0, coro, 1, struct coro);
2362 coro->args = newAV ();
2363 coro->flags = CF_NEW;
2364
2365 if (coro_first) coro_first->prev = coro;
2366 coro->next = coro_first;
2367 coro_first = coro;
2368
2369 coro->hv = hv = newHV ();
2370 mg = sv_magicext ((SV *)hv, 0, CORO_MAGIC_type_state, &coro_state_vtbl, (char *)coro, 0);
2371 mg->mg_flags |= MGf_DUP;
2372 RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
2373
2374 av_extend (coro->args, items - 1);
2375 for (i = 1; i < items; i++)
2376 av_push (coro->args, newSVsv (ST (i)));
2377}
2378 OUTPUT:
2379 RETVAL
2380
2381void
2382transfer (...)
2383 PROTOTYPE: $$
2384 CODE:
2385 CORO_EXECUTE_SLF_XS (slf_init_transfer);
2386
2387bool
2388_destroy (SV *coro_sv)
2389 CODE:
2390 RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
2391 OUTPUT:
2392 RETVAL
2393
2394void
2395_exit (int code)
2396 PROTOTYPE: $
2397 CODE:
2398 _exit (code);
2399
2400int
2401cctx_stacksize (int new_stacksize = 0)
2402 PROTOTYPE: ;$
2403 CODE:
2404 RETVAL = cctx_stacksize;
2405 if (new_stacksize)
2406 {
2407 cctx_stacksize = new_stacksize;
2408 ++cctx_gen;
2409 }
2410 OUTPUT:
2411 RETVAL
2412
2413int
2414cctx_max_idle (int max_idle = 0)
2415 PROTOTYPE: ;$
2416 CODE:
2417 RETVAL = cctx_max_idle;
2418 if (max_idle > 1)
2419 cctx_max_idle = max_idle;
2420 OUTPUT:
2421 RETVAL
2422
2423int
2424cctx_count ()
2425 PROTOTYPE:
2426 CODE:
2427 RETVAL = cctx_count;
2428 OUTPUT:
2429 RETVAL
2430
2431int
2432cctx_idle ()
2433 PROTOTYPE:
2434 CODE:
2435 RETVAL = cctx_idle;
2436 OUTPUT:
2437 RETVAL
2438
2439void
2440list ()
2441 PROTOTYPE:
2442 PPCODE:
2443{
2444 struct coro *coro;
2445 for (coro = coro_first; coro; coro = coro->next)
2446 if (coro->hv)
2447 XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
2448}
2449
2450void
2451call (Coro::State coro, SV *coderef)
2452 ALIAS:
2453 eval = 1
2454 CODE:
2455{
2456 if (coro->mainstack && ((coro->flags & CF_RUNNING) || coro->slot))
2457 {
2458 struct coro temp;
2459
2460 if (!(coro->flags & CF_RUNNING))
351 { 2461 {
352 /* I never used formats, so how should I know how these are implemented? */ 2462 PUTBACK;
353 /* my bold guess is as a simple, plain sub... */ 2463 save_perl (aTHX_ &temp);
354 croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats"); 2464 load_perl (aTHX_ coro);
2465 }
2466
2467 {
2468 dSP;
2469 ENTER;
2470 SAVETMPS;
2471 PUTBACK;
2472 PUSHSTACK;
2473 PUSHMARK (SP);
2474
2475 if (ix)
2476 eval_sv (coderef, 0);
2477 else
2478 call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
2479
2480 POPSTACK;
2481 SPAGAIN;
2482 FREETMPS;
2483 LEAVE;
2484 PUTBACK;
2485 }
2486
2487 if (!(coro->flags & CF_RUNNING))
2488 {
2489 save_perl (aTHX_ coro);
2490 load_perl (aTHX_ &temp);
2491 SPAGAIN;
355 } 2492 }
356 } 2493 }
357 while (cxix >= 0); 2494}
358 2495
359 if (top_si->si_type == PERLSI_MAIN) 2496SV *
360 break; 2497is_ready (Coro::State coro)
2498 PROTOTYPE: $
2499 ALIAS:
2500 is_ready = CF_READY
2501 is_running = CF_RUNNING
2502 is_new = CF_NEW
2503 is_destroyed = CF_DESTROYED
2504 CODE:
2505 RETVAL = boolSV (coro->flags & ix);
2506 OUTPUT:
2507 RETVAL
361 2508
362 top_si = top_si->si_prev; 2509void
363 ccstk = top_si->si_cxstack; 2510throw (Coro::State self, SV *throw = &PL_sv_undef)
364 cxix = top_si->si_cxix; 2511 PROTOTYPE: $;$
2512 CODE:
2513{
2514 struct coro *current = SvSTATE_current;
2515 SV **throwp = self == current ? &coro_throw : &self->throw;
2516 SvREFCNT_dec (*throwp);
2517 *throwp = SvOK (throw) ? newSVsv (throw) : 0;
2518}
2519
2520void
2521api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
2522 PROTOTYPE: $;$
2523 C_ARGS: aTHX_ coro, flags
2524
2525SV *
2526has_cctx (Coro::State coro)
2527 PROTOTYPE: $
2528 CODE:
2529 RETVAL = boolSV (!!coro->cctx);
2530 OUTPUT:
2531 RETVAL
2532
2533int
2534is_traced (Coro::State coro)
2535 PROTOTYPE: $
2536 CODE:
2537 RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
2538 OUTPUT:
2539 RETVAL
2540
2541UV
2542rss (Coro::State coro)
2543 PROTOTYPE: $
2544 ALIAS:
2545 usecount = 1
2546 CODE:
2547 switch (ix)
2548 {
2549 case 0: RETVAL = coro_rss (aTHX_ coro); break;
2550 case 1: RETVAL = coro->usecount; break;
365 } 2551 }
2552 OUTPUT:
2553 RETVAL
366 2554
367 PUTBACK; 2555void
368 } 2556force_cctx ()
2557 PROTOTYPE:
2558 CODE:
2559 SvSTATE_current->cctx->idle_sp = 0;
369 2560
370 c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0; 2561void
371 c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0; 2562swap_defsv (Coro::State self)
372 c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0; 2563 PROTOTYPE: $
373 2564 ALIAS:
374 /* I have not the slightest idea of why av_reify is necessary */ 2565 swap_defav = 1
375 /* but if it's missing the defav contents magically get replaced sometimes */ 2566 CODE:
376 if (c->defav) 2567 if (!self->slot)
377 av_reify (c->defav); 2568 croak ("cannot swap state with coroutine that has no saved state,");
378 2569 else
379 c->dowarn = PL_dowarn;
380
381 c->curstackinfo = PL_curstackinfo;
382 c->curstack = PL_curstack;
383 c->mainstack = PL_mainstack;
384 c->stack_sp = PL_stack_sp;
385 c->op = PL_op;
386 c->curpad = PL_curpad;
387 c->stack_base = PL_stack_base;
388 c->stack_max = PL_stack_max;
389 c->tmps_stack = PL_tmps_stack;
390 c->tmps_floor = PL_tmps_floor;
391 c->tmps_ix = PL_tmps_ix;
392 c->tmps_max = PL_tmps_max;
393 c->markstack = PL_markstack;
394 c->markstack_ptr = PL_markstack_ptr;
395 c->markstack_max = PL_markstack_max;
396 c->scopestack = PL_scopestack;
397 c->scopestack_ix = PL_scopestack_ix;
398 c->scopestack_max = PL_scopestack_max;
399 c->savestack = PL_savestack;
400 c->savestack_ix = PL_savestack_ix;
401 c->savestack_max = PL_savestack_max;
402 c->retstack = PL_retstack;
403 c->retstack_ix = PL_retstack_ix;
404 c->retstack_max = PL_retstack_max;
405 c->curcop = PL_curcop;
406}
407
408/*
409 * destroy the stacks, the callchain etc...
410 * still there is a memleak of 128 bytes...
411 */
412STATIC void
413destroy_stacks(pTHX)
414{
415 /* is this ugly, I ask? */
416 while (PL_scopestack_ix)
417 LEAVE;
418
419 /* sure it is, but more important: is it correct?? :/ */
420 while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
421 FREETMPS;
422
423 while (PL_curstackinfo->si_next)
424 PL_curstackinfo = PL_curstackinfo->si_next;
425
426 while (PL_curstackinfo)
427 {
428 PERL_SI *p = PL_curstackinfo->si_prev;
429
430 { 2570 {
431 dSP; 2571 SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
432 SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack); 2572 SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
433 PUTBACK; /* possibly superfluous */ 2573
2574 SV *tmp = *src; *src = *dst; *dst = tmp;
434 } 2575 }
435 2576
436 dounwind(-1);
437 2577
438 SvREFCNT_dec(PL_curstackinfo->si_stack); 2578MODULE = Coro::State PACKAGE = Coro
439 Safefree(PL_curstackinfo->si_cxstack);
440 Safefree(PL_curstackinfo);
441 PL_curstackinfo = p;
442 }
443 2579
444 Safefree(PL_tmps_stack); 2580BOOT:
445 Safefree(PL_markstack);
446 Safefree(PL_scopestack);
447 Safefree(PL_savestack);
448 Safefree(PL_retstack);
449}
450
451STATIC void
452transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
453{ 2581{
454 dSP; 2582 int i;
455 2583
456 if (prev != next) 2584 av_async_pool = coro_get_av (aTHX_ "Coro::async_pool", TRUE);
457 { 2585 sv_pool_rss = coro_get_sv (aTHX_ "Coro::POOL_RSS" , TRUE);
458 /* 2586 sv_pool_size = coro_get_sv (aTHX_ "Coro::POOL_SIZE" , TRUE);
459 * this could be done in newprocess which would lead to 2587
460 * extremely elegant and fast (just SAVE/LOAD) 2588 coro_current = coro_get_sv (aTHX_ "Coro::current", FALSE);
461 * code here, but lazy allocation of stacks has also 2589 SvREADONLY_on (coro_current);
462 * some virtues and the overhead of the if() is nil. 2590
463 */ 2591 coro_stash = gv_stashpv ("Coro", TRUE);
464 if (next->mainstack) 2592
2593 newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
2594 newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
2595 newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
2596 newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
2597 newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
2598 newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
2599
2600 for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
2601 coro_ready[i] = newAV ();
2602
465 { 2603 {
466 SAVE (prev, flags); 2604 SV *sv = coro_get_sv (aTHX_ "Coro::API", TRUE);
467 LOAD (next); 2605
468 /* mark this state as in-use */ 2606 coroapi.schedule = api_schedule;
469 next->mainstack = 0; 2607 coroapi.cede = api_cede;
470 next->tmps_ix = -2; 2608 coroapi.cede_notself = api_cede_notself;
2609 coroapi.ready = api_ready;
2610 coroapi.is_ready = api_is_ready;
2611 coroapi.nready = coro_nready;
2612 coroapi.current = coro_current;
2613
2614 GCoroAPI = &coroapi;
2615 sv_setiv (sv, (IV)&coroapi);
2616 SvREADONLY_on (sv);
471 } 2617 }
472 else if (next->tmps_ix == -2) 2618}
2619
2620void
2621schedule (...)
2622 CODE:
2623 CORO_EXECUTE_SLF_XS (slf_init_schedule);
2624
2625void
2626cede (...)
2627 CODE:
2628 CORO_EXECUTE_SLF_XS (slf_init_cede);
2629
2630void
2631cede_notself (...)
2632 CODE:
2633 CORO_EXECUTE_SLF_XS (slf_init_cede_notself);
2634
2635void
2636_set_current (SV *current)
2637 PROTOTYPE: $
2638 CODE:
2639 SvREFCNT_dec (SvRV (coro_current));
2640 SvRV_set (coro_current, SvREFCNT_inc_NN (SvRV (current)));
2641
2642void
2643_set_readyhook (SV *hook)
2644 PROTOTYPE: $
2645 CODE:
2646 SvREFCNT_dec (coro_readyhook);
2647 coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;
2648
2649int
2650prio (Coro::State coro, int newprio = 0)
2651 PROTOTYPE: $;$
2652 ALIAS:
2653 nice = 1
2654 CODE:
2655{
2656 RETVAL = coro->prio;
2657
2658 if (items > 1)
473 { 2659 {
474 croak ("tried to transfer to running coroutine"); 2660 if (ix)
2661 newprio = coro->prio - newprio;
2662
2663 if (newprio < PRIO_MIN) newprio = PRIO_MIN;
2664 if (newprio > PRIO_MAX) newprio = PRIO_MAX;
2665
2666 coro->prio = newprio;
475 } 2667 }
476 else 2668}
2669 OUTPUT:
2670 RETVAL
2671
2672SV *
2673ready (SV *self)
2674 PROTOTYPE: $
2675 CODE:
2676 RETVAL = boolSV (api_ready (aTHX_ self));
2677 OUTPUT:
2678 RETVAL
2679
2680int
2681nready (...)
2682 PROTOTYPE:
2683 CODE:
2684 RETVAL = coro_nready;
2685 OUTPUT:
2686 RETVAL
2687
2688# for async_pool speedup
2689void
2690_pool_1 (SV *cb)
2691 CODE:
2692{
2693 HV *hv = (HV *)SvRV (coro_current);
2694 struct coro *coro = SvSTATE_hv ((SV *)hv);
2695 AV *defav = GvAV (PL_defgv);
2696 SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
2697 AV *invoke_av;
2698 int i, len;
2699
2700 if (!invoke)
477 { 2701 {
478 /* 2702 SV *old = PL_diehook;
479 * emulate part of the perl startup here. 2703 PL_diehook = 0;
480 */
481 UNOP myop;
482
483 SAVE (prev, -1); /* first get rid of the old state */
484
485 init_stacks (); /* from perl.c */
486 SPAGAIN;
487
488 PL_op = (OP *)&myop;
489 /*PL_curcop = 0;*/
490 SvREFCNT_dec (GvAV (PL_defgv)); 2704 SvREFCNT_dec (old);
491 GvAV (PL_defgv) = next->args; 2705 croak ("\3async_pool terminate\2\n");
492
493 Zero(&myop, 1, UNOP);
494 myop.op_next = Nullop;
495 myop.op_flags = OPf_WANT_VOID;
496
497 PUSHMARK(SP);
498 XPUSHs ((SV*)get_cv(SUB_INIT, TRUE));
499 /*
500 * the next line is slightly wrong, as PL_op->op_next
501 * is actually being executed so we skip the first op.
502 * that doesn't matter, though, since it is only
503 * pp_nextstate and we never return...
504 * ah yes, and I don't care anyways ;)
505 */
506 PUTBACK;
507 PL_op = pp_entersub(aTHX);
508 SPAGAIN;
509
510 ENTER; /* necessary e.g. for dounwind */
511 } 2706 }
512 }
513}
514 2707
2708 SvREFCNT_dec (coro->saved_deffh);
2709 coro->saved_deffh = SvREFCNT_inc_NN ((SV *)PL_defoutgv);
2710
2711 hv_store (hv, "desc", sizeof ("desc") - 1,
2712 newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
2713
2714 invoke_av = (AV *)SvRV (invoke);
2715 len = av_len (invoke_av);
2716
2717 sv_setsv (cb, AvARRAY (invoke_av)[0]);
2718
2719 if (len > 0)
2720 {
2721 av_fill (defav, len - 1);
2722 for (i = 0; i < len; ++i)
2723 av_store (defav, i, SvREFCNT_inc_NN (AvARRAY (invoke_av)[i + 1]));
2724 }
2725}
2726
2727void
2728_pool_2 (SV *cb)
2729 CODE:
2730{
2731 HV *hv = (HV *)SvRV (coro_current);
2732 struct coro *coro = SvSTATE_hv ((SV *)hv);
2733
2734 sv_setsv (cb, &PL_sv_undef);
2735
2736 SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
2737 coro->saved_deffh = 0;
2738
2739 if (coro_rss (aTHX_ coro) > SvUV (sv_pool_rss)
2740 || av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
2741 {
2742 SV *old = PL_diehook;
2743 PL_diehook = 0;
2744 SvREFCNT_dec (old);
2745 croak ("\3async_pool terminate\2\n");
2746 }
2747
2748 av_clear (GvAV (PL_defgv));
2749 hv_store (hv, "desc", sizeof ("desc") - 1,
2750 newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
2751
2752 coro->prio = 0;
2753
2754 if (coro->cctx && (coro->cctx->flags & CC_TRACE))
2755 api_trace (aTHX_ coro_current, 0);
2756
2757 av_push (av_async_pool, newSVsv (coro_current));
2758}
2759
2760
515MODULE = Coro::State PACKAGE = Coro::State 2761MODULE = Coro::State PACKAGE = PerlIO::cede
516
517PROTOTYPES: ENABLE
518 2762
519BOOT: 2763BOOT:
520{ /* {} necessary for stoopid perl-5.6.x */ 2764 PerlIO_define_layer (aTHX_ &PerlIO_cede);
521 HV * stash = gv_stashpvn("Coro::State", 10, TRUE);
522 2765
523 newCONSTSUB (stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
524 newCONSTSUB (stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
525 newCONSTSUB (stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
526 2766
527 if (!padlist_cache) 2767MODULE = Coro::State PACKAGE = Coro::Semaphore
528 padlist_cache = newHV ();
529 2768
530 main_mainstack = PL_mainstack; 2769SV *
531} 2770new (SV *klass, SV *count_ = 0)
532 2771 CODE:
533Coro::State 2772{
534_newprocess(args) 2773 /* a semaphore contains a counter IV in $sem->[0] and any waiters after that */
2774 AV *av = newAV ();
535 SV * args 2775 SV **ary;
536 PROTOTYPE: $ 2776
2777 /* unfortunately, building manually saves memory */
2778 Newx (ary, 2, SV *);
2779 AvALLOC (av) = ary;
2780 AvARRAY (av) = ary;
2781 AvMAX (av) = 1;
2782 AvFILLp (av) = 0;
2783 ary [0] = newSViv (count_ && SvOK (count_) ? SvIV (count_) : 1);
2784
2785 RETVAL = sv_bless (newRV_noinc ((SV *)av), GvSTASH (CvGV (cv)));
2786}
2787 OUTPUT:
2788 RETVAL
2789
2790SV *
2791count (SV *self)
2792 CODE:
2793 RETVAL = newSVsv (AvARRAY ((AV *)SvRV (self))[0]);
2794 OUTPUT:
2795 RETVAL
2796
2797void
2798up (SV *self, int adjust = 1)
2799 ALIAS:
2800 adjust = 1
537 CODE: 2801 CODE:
538 Coro__State coro; 2802 coro_semaphore_adjust (aTHX_ (AV *)SvRV (self), ix ? adjust : 1);
539
540 if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
541 croak ("Coro::State::_newprocess expects an arrayref");
542
543 New (0, coro, 1, struct coro);
544
545 coro->mainstack = 0; /* actual work is done inside transfer */
546 coro->args = (AV *)SvREFCNT_inc (SvRV (args));
547
548 RETVAL = coro;
549 OUTPUT:
550 RETVAL
551 2803
552void 2804void
553transfer(prev, next, flags = TRANSFER_SAVE_ALL) 2805down (SV *self)
554 Coro::State_or_hashref prev
555 Coro::State_or_hashref next
556 int flags
557 PROTOTYPE: @
558 CODE: 2806 CODE:
559 2807 CORO_EXECUTE_SLF_XS (slf_init_semaphore_down);
560 transfer (aTHX_ prev, next, flags);
561 2808
562void 2809void
563DESTROY(coro) 2810try (SV *self)
564 Coro::State coro
565 CODE: 2811 PPCODE:
2812{
2813 AV *av = (AV *)SvRV (self);
2814 SV *count_sv = AvARRAY (av)[0];
2815 IV count = SvIVX (count_sv);
566 2816
567 if (coro->mainstack && coro->mainstack != main_mainstack) 2817 if (count > 0)
568 { 2818 {
569 struct coro temp; 2819 --count;
570 2820 SvIVX (count_sv) = count;
571 SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL); 2821 XSRETURN_YES;
572 LOAD(aTHX_ coro);
573
574 destroy_stacks ();
575
576 LOAD((&temp)); /* this will get rid of defsv etc.. */
577 } 2822 }
2823 else
2824 XSRETURN_NO;
2825}
578 2826
579 Safefree (coro);
580
581 /*
582 * there is one problematic case left (remember _recurse?)
583 * consider the case when we
584 *
585 * 1. start a coroutine
586 * 2. inside it descend into some xs functions
587 * 3. xs function calls a callback
588 * 4. callback switches to $main
589 * 5. $main ends - we will end inside the xs function
590 * 6. xs function returns and perl executes - what?
591 *
592 * to avoid this case we recurse in this function
593 * and simply call my_exit(0), skipping other xs functions
594 */
595
596#if 0
597void 2827void
598_recurse() 2828waiters (SV *self)
2829 CODE:
2830{
2831 AV *av = (AV *)SvRV (self);
2832
2833 if (GIMME_V == G_SCALAR)
2834 XPUSHs (sv_2mortal (newSVsv (AvARRAY (av)[0])));
2835 else
2836 {
2837 int i;
2838 EXTEND (SP, AvFILLp (av) + 1 - 1);
2839 for (i = 1; i <= AvFILLp (av); ++i)
2840 PUSHs (sv_2mortal (newRV_inc (AvARRAY (av)[i])));
2841 }
2842}
2843
2844
2845MODULE = Coro::State PACKAGE = Coro::AnyEvent
2846
2847BOOT:
2848 sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);
2849
2850void
2851_schedule (...)
599 CODE: 2852 CODE:
600 LEAVE; 2853{
601 PL_stack_sp = PL_stack_base + ax - 1; 2854 static int incede;
602 PL_op = PL_op->op_next;
603 CALLRUNOPS(aTHX);
604 printf ("my_exit\n");
605 my_exit (0);
606 2855
607#endif 2856 api_cede_notself (aTHX);
2857
2858 ++incede;
2859 while (coro_nready >= incede && api_cede (aTHX))
2860 ;
2861
2862 sv_setsv (sv_activity, &PL_sv_undef);
2863 if (coro_nready >= incede)
2864 {
2865 PUSHMARK (SP);
2866 PUTBACK;
2867 call_pv ("Coro::AnyEvent::_activity", G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
2868 }
2869
2870 --incede;
2871}
2872
2873
2874MODULE = Coro::State PACKAGE = Coro::AIO
608 2875
609void 2876void
610flush() 2877_register (char *target, char *proto, SV *req)
611 CODE: 2878 CODE:
612#ifdef MAY_FLUSH 2879{
613 flush_padlist_cache (); 2880 HV *st;
614#endif
615
616MODULE = Coro::State PACKAGE = Coro::Cont
617
618# this is dirty (do you hear me?) and should be in it's own .xs
619
620void
621result(...)
622 PROTOTYPE: @
623 CODE:
624 static SV *returnstk;
625 SV *sv; 2881 GV *gvp;
626 AV *defav = GvAV (PL_defgv); 2882 CV *req_cv = sv_2cv (req, &st, &gvp, 0);
627 struct coro *prev, *next; 2883 /* newXSproto doesn't return the CV on 5.8 */
2884 CV *slf_cv = newXS (target, coro_aio_req_xs, __FILE__);
2885 sv_setpv ((SV *)slf_cv, proto);
2886 sv_magicext ((SV *)slf_cv, (SV *)req_cv, CORO_MAGIC_type_aio, 0, 0, 0);
2887}
628 2888
629 if (!returnstk)
630 returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
631
632 /* set up @_ -- ugly */
633 av_clear (defav);
634 av_fill (defav, items - 1);
635 while (items--)
636 av_store (defav, items, SvREFCNT_inc (ST(items)));
637
638 mg_get (returnstk); /* isn't documentation wrong for mg_get? */
639 sv = av_pop ((AV *)SvRV (returnstk));
640 prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
641 next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
642 SvREFCNT_dec (sv);
643 transfer(prev, next, 0);
644

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