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Comparing Coro/Coro/State.xs (file contents):
Revision 1.11 by root, Sat Jul 21 18:21:45 2001 UTC vs.
Revision 1.289 by root, Mon Nov 17 08:25:06 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 SAVE_DEFAV 0x00000001 56#define PERL_VERSION_ATLEAST(a,b,c) \
16#define SAVE_DEFSV 0x00000002 57 (PERL_REVISION > (a) \
17#define SAVE_ERRSV 0x00000004 58 || (PERL_REVISION == (a) \
59 && (PERL_VERSION > (b) \
60 || (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
18 61
19#define 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 void *stacklevel = __builtin_frame_address (0)
126#else
127# define dSTACKLEVEL volatile void *stacklevel = (volatile void *)&stacklevel
128#endif
129
130#define IN_DESTRUCT (PL_main_cv == Nullcv)
131
132#if __GNUC__ >= 3
133# define attribute(x) __attribute__(x)
134# define expect(expr,value) __builtin_expect ((expr),(value))
135# define INLINE static inline
136#else
137# define attribute(x)
138# define expect(expr,value) (expr)
139# define INLINE static
140#endif
141
142#define expect_false(expr) expect ((expr) != 0, 0)
143#define expect_true(expr) expect ((expr) != 0, 1)
144
145#define NOINLINE attribute ((noinline))
146
147#include "CoroAPI.h"
148
149#ifdef USE_ITHREADS
150# if CORO_PTHREAD
151static void *coro_thx;
152# endif
153#endif
154
155static double (*nvtime)(); /* so why doesn't it take void? */
156
157static U32 cctx_gen;
158static size_t cctx_stacksize = CORO_STACKSIZE;
159static struct CoroAPI coroapi;
160static AV *main_mainstack; /* used to differentiate between $main and others */
161static JMPENV *main_top_env;
162static HV *coro_state_stash, *coro_stash;
163static volatile SV *coro_mortal; /* will be freed/thrown after next transfer */
164
165static GV *irsgv; /* $/ */
166static GV *stdoutgv; /* *STDOUT */
167static SV *rv_diehook;
168static SV *rv_warnhook;
169static HV *hv_sig; /* %SIG */
170
171/* async_pool helper stuff */
172static SV *sv_pool_rss;
173static SV *sv_pool_size;
174static AV *av_async_pool;
175
176/* Coro::AnyEvent */
177static SV *sv_activity;
178
179static struct coro_cctx *cctx_first;
180static int cctx_count, cctx_idle;
181
182enum {
183 CC_MAPPED = 0x01,
184 CC_NOREUSE = 0x02, /* throw this away after tracing */
185 CC_TRACE = 0x04,
186 CC_TRACE_SUB = 0x08, /* trace sub calls */
187 CC_TRACE_LINE = 0x10, /* trace each statement */
188 CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
189};
190
191/* this is a structure representing a c-level coroutine */
192typedef struct coro_cctx
193{
194 struct coro_cctx *next;
195
196 /* the stack */
197 void *sptr;
198 size_t ssize;
199
200 /* cpu state */
201 void *idle_sp; /* sp of top-level transfer/schedule/cede call */
202 JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
203 JMPENV *top_env;
204 coro_context cctx;
205
206 U32 gen;
207#if CORO_USE_VALGRIND
208 int valgrind_id;
209#endif
210 unsigned char flags;
211} coro_cctx;
212
213enum {
214 CF_RUNNING = 0x0001, /* coroutine is running */
215 CF_READY = 0x0002, /* coroutine is ready */
216 CF_NEW = 0x0004, /* has never been switched to */
217 CF_DESTROYED = 0x0008, /* coroutine data has been freed */
218};
219
220/* the structure where most of the perl state is stored, overlaid on the cxstack */
221typedef struct
222{
223 SV *defsv;
224 AV *defav;
225 SV *errsv;
226 SV *irsgv;
227#define VAR(name,type) type name;
228# include "state.h"
229#undef VAR
230} perl_slots;
231
232#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
233
234/* this is a structure representing a perl-level coroutine */
21struct coro { 235struct coro {
22 /* optionally saved, might be zero */ 236 /* the C coroutine allocated to this perl coroutine, if any */
23 AV *defav; 237 coro_cctx *cctx;
24 SV *defsv;
25 SV *errsv;
26
27 /* saved global state not related to stacks */
28 U8 dowarn;
29 238
30 /* the stacks and related info (callchain etc..) */ 239 /* state data */
31 PERL_SI *curstackinfo; 240 struct CoroSLF slf_frame; /* saved slf frame */
32 AV *curstack;
33 AV *mainstack; 241 AV *mainstack;
34 SV **stack_sp; 242 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;
56 243
57 /* data associated with this coroutine (initial args) */ 244 AV *args; /* data associated with this coroutine (initial args) */
58 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 void (*on_destroy)(pTHX_ struct coro *coro);
249
250 /* statistics */
251 int usecount; /* number of transfers to this coro */
252
253 /* coro process data */
254 int prio;
255 SV *throw; /* exception to be thrown */
256
257 /* async_pool */
258 SV *saved_deffh;
259
260 /* linked list */
261 struct coro *next, *prev;
59}; 262};
60 263
61typedef struct coro *Coro__State; 264typedef struct coro *Coro__State;
62typedef struct coro *Coro__State_or_hashref; 265typedef struct coro *Coro__State_or_hashref;
63 266
64static HV *padlist_cache; 267/* the following variables are effectively part of the perl context */
268/* and get copied between struct coro and these variables */
269/* the mainr easonw e don't support windows process emulation */
270static struct CoroSLF slf_frame; /* the current slf frame */
271static SV *coro_throw;
65 272
66/* mostly copied from op.c:cv_clone2 */ 273/** Coro ********************************************************************/
67STATIC AV * 274
68clone_padlist (AV *protopadlist) 275#define PRIO_MAX 3
276#define PRIO_HIGH 1
277#define PRIO_NORMAL 0
278#define PRIO_LOW -1
279#define PRIO_IDLE -3
280#define PRIO_MIN -4
281
282/* for Coro.pm */
283static SV *coro_current;
284static SV *coro_readyhook;
285static AV *coro_ready [PRIO_MAX - PRIO_MIN + 1];
286static struct coro *coro_first;
287#define coro_nready coroapi.nready
288
289/** lowlevel stuff **********************************************************/
290
291static SV *
292coro_get_sv (pTHX_ const char *name, int create)
69{ 293{
70 AV *av; 294#if PERL_VERSION_ATLEAST (5,10,0)
71 I32 ix; 295 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
72 AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE); 296 get_sv (name, create);
73 AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE); 297#endif
74 SV **pname = AvARRAY (protopad_name); 298 return get_sv (name, create);
75 SV **ppad = AvARRAY (protopad); 299}
76 I32 fname = AvFILLp (protopad_name); 300
77 I32 fpad = AvFILLp (protopad); 301static AV *
302coro_get_av (pTHX_ const char *name, int create)
303{
304#if PERL_VERSION_ATLEAST (5,10,0)
305 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
306 get_av (name, create);
307#endif
308 return get_av (name, create);
309}
310
311static HV *
312coro_get_hv (pTHX_ const char *name, int create)
313{
314#if PERL_VERSION_ATLEAST (5,10,0)
315 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
316 get_hv (name, create);
317#endif
318 return get_hv (name, create);
319}
320
321static AV *
322coro_clone_padlist (pTHX_ CV *cv)
323{
324 AV *padlist = CvPADLIST (cv);
78 AV *newpadlist, *newpad_name, *newpad; 325 AV *newpadlist, *newpad;
79 SV **npad;
80
81 newpad_name = newAV ();
82 for (ix = fname; ix >= 0; ix--)
83 av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
84
85 newpad = newAV ();
86 av_fill (newpad, AvFILLp (protopad));
87 npad = AvARRAY (newpad);
88 326
89 newpadlist = newAV (); 327 newpadlist = newAV ();
90 AvREAL_off (newpadlist); 328 AvREAL_off (newpadlist);
91 av_store (newpadlist, 0, (SV *) newpad_name); 329#if PERL_VERSION_ATLEAST (5,10,0)
330 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
331#else
332 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
333#endif
334 newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
335 --AvFILLp (padlist);
336
337 av_store (newpadlist, 0, SvREFCNT_inc_NN (*av_fetch (padlist, 0, FALSE)));
92 av_store (newpadlist, 1, (SV *) newpad); 338 av_store (newpadlist, 1, (SV *)newpad);
93 339
94 av = newAV (); /* will be @_ */ 340 return newpadlist;
95 av_extend (av, 0); 341}
96 av_store (newpad, 0, (SV *) av);
97 AvFLAGS (av) = AVf_REIFY;
98 342
99 for (ix = fpad; ix > 0; ix--) 343static void
344free_padlist (pTHX_ AV *padlist)
345{
346 /* may be during global destruction */
347 if (SvREFCNT (padlist))
100 { 348 {
101 SV *namesv = (ix <= fname) ? pname[ix] : Nullsv; 349 I32 i = AvFILLp (padlist);
102 if (namesv && namesv != &PL_sv_undef) 350 while (i >= 0)
103 { 351 {
104 char *name = SvPVX (namesv); /* XXX */ 352 SV **svp = av_fetch (padlist, i--, FALSE);
105 if (SvFLAGS (namesv) & SVf_FAKE || *name == '&') 353 if (svp)
106 { /* lexical from outside? */
107 npad[ix] = SvREFCNT_inc (ppad[ix]);
108 } 354 {
109 else
110 { /* our own lexical */
111 SV *sv; 355 SV *sv;
112 if (*name == '&') 356 while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
113 sv = SvREFCNT_inc (ppad[ix]); 357 SvREFCNT_dec (sv);
114 else if (*name == '@') 358
115 sv = (SV *) newAV (); 359 SvREFCNT_dec (*svp);
116 else if (*name == '%')
117 sv = (SV *) newHV ();
118 else
119 sv = NEWSV (0, 0);
120 if (!SvPADBUSY (sv))
121 SvPADMY_on (sv);
122 npad[ix] = sv;
123 } 360 }
124 } 361 }
125 else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
126 {
127 npad[ix] = SvREFCNT_inc (ppad[ix]);
128 }
129 else
130 {
131 SV *sv = NEWSV (0, 0);
132 SvPADTMP_on (sv);
133 npad[ix] = sv;
134 }
135 }
136 362
137#if 0 /* return -ENOTUNDERSTOOD */
138 /* Now that vars are all in place, clone nested closures. */
139
140 for (ix = fpad; ix > 0; ix--) {
141 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
142 if (namesv
143 && namesv != &PL_sv_undef
144 && !(SvFLAGS(namesv) & SVf_FAKE)
145 && *SvPVX(namesv) == '&'
146 && CvCLONE(ppad[ix]))
147 {
148 CV *kid = cv_clone((CV*)ppad[ix]);
149 SvREFCNT_dec(ppad[ix]);
150 CvCLONE_on(kid);
151 SvPADMY_on(kid);
152 npad[ix] = (SV*)kid;
153 }
154 }
155#endif
156
157 return newpadlist;
158}
159
160#ifdef MAY_FLUSH
161STATIC AV *
162free_padlist (AV *padlist)
163{
164 /* may be during global destruction */
165 if (SvREFCNT(padlist))
166 {
167 I32 i = AvFILLp(padlist);
168 while (i >= 0)
169 {
170 SV **svp = av_fetch(padlist, i--, FALSE);
171 SV *sv = svp ? *svp : Nullsv;
172 if (sv)
173 SvREFCNT_dec(sv);
174 }
175
176 SvREFCNT_dec((SV*)padlist); 363 SvREFCNT_dec ((SV*)padlist);
177 } 364 }
178} 365}
179#endif 366
367static int
368coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
369{
370 AV *padlist;
371 AV *av = (AV *)mg->mg_obj;
372
373 /* casting is fun. */
374 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
375 free_padlist (aTHX_ padlist);
376
377 SvREFCNT_dec (av); /* sv_magicext increased the refcount */
378
379 return 0;
380}
381
382#define CORO_MAGIC_type_cv 26
383#define CORO_MAGIC_type_state PERL_MAGIC_ext
384
385static MGVTBL coro_cv_vtbl = {
386 0, 0, 0, 0,
387 coro_cv_free
388};
389
390#define CORO_MAGIC_NN(sv, type) \
391 (expect_true (SvMAGIC (sv)->mg_type == type) \
392 ? SvMAGIC (sv) \
393 : mg_find (sv, type))
394
395#define CORO_MAGIC(sv, type) \
396 (expect_true (SvMAGIC (sv)) \
397 ? CORO_MAGIC_NN (sv, type) \
398 : 0)
399
400#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
401#define CORO_MAGIC_state(sv) CORO_MAGIC_NN (((SV *)(sv)), CORO_MAGIC_type_state)
402
403INLINE struct coro *
404SvSTATE_ (pTHX_ SV *coro)
405{
406 HV *stash;
407 MAGIC *mg;
408
409 if (SvROK (coro))
410 coro = SvRV (coro);
411
412 if (expect_false (SvTYPE (coro) != SVt_PVHV))
413 croak ("Coro::State object required");
414
415 stash = SvSTASH (coro);
416 if (expect_false (stash != coro_stash && stash != coro_state_stash))
417 {
418 /* very slow, but rare, check */
419 if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
420 croak ("Coro::State object required");
421 }
422
423 mg = CORO_MAGIC_state (coro);
424 return (struct coro *)mg->mg_ptr;
425}
426
427#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
428
429/* faster than SvSTATE, but expects a coroutine hv */
430#define SvSTATE_hv(hv) ((struct coro *)CORO_MAGIC_NN ((SV *)hv, CORO_MAGIC_type_state)->mg_ptr)
431#define SvSTATE_current SvSTATE_hv (SvRV (coro_current))
180 432
181/* the next two functions merely cache the padlists */ 433/* the next two functions merely cache the padlists */
182STATIC void 434static void
183get_padlist (CV *cv) 435get_padlist (pTHX_ CV *cv)
184{ 436{
185 SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0); 437 MAGIC *mg = CORO_MAGIC_cv (cv);
438 AV *av;
186 439
187 if (he && AvFILLp ((AV *)*he) >= 0) 440 if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
188 CvPADLIST (cv) = (AV *)av_pop ((AV *)*he); 441 CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
189 else 442 else
190 CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
191}
192
193STATIC void
194put_padlist (CV *cv)
195{
196 SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
197
198 if (SvTYPE (*he) != SVt_PVAV)
199 { 443 {
444#if CORO_PREFER_PERL_FUNCTIONS
445 /* this is probably cleaner? but also slower! */
446 /* in practise, it seems to be less stable */
447 CV *cp = Perl_cv_clone (cv);
448 CvPADLIST (cv) = CvPADLIST (cp);
449 CvPADLIST (cp) = 0;
200 SvREFCNT_dec (*he); 450 SvREFCNT_dec (cp);
201 *he = (SV *)newAV (); 451#else
452 CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
453#endif
202 } 454 }
203
204 av_push ((AV *)*he, (SV *)CvPADLIST (cv));
205} 455}
206 456
207#ifdef MAY_FLUSH
208STATIC void
209flush_padlist_cache ()
210{
211 HV *hv = padlist_cache;
212 padlist_cache = newHV ();
213
214 if (hv_iterinit (hv))
215 {
216 HE *he;
217 AV *padlist;
218
219 while (!!(he = hv_iternext (hv)))
220 {
221 AV *av = (AV *)HeVAL(he);
222
223 /* casting is fun. */
224 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
225 free_padlist (padlist);
226 }
227 }
228
229 SvREFCNT_dec (hv);
230}
231#endif
232
233#define SB do {
234#define SE } while (0)
235
236#define LOAD(state) SB load_state(aTHX_ state); SPAGAIN; SE
237#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ state,flags); SE
238
239#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE
240
241static void 457static void
458put_padlist (pTHX_ CV *cv)
459{
460 MAGIC *mg = CORO_MAGIC_cv (cv);
461 AV *av;
462
463 if (expect_false (!mg))
464 mg = sv_magicext ((SV *)cv, (SV *)newAV (), CORO_MAGIC_type_cv, &coro_cv_vtbl, 0, 0);
465
466 av = (AV *)mg->mg_obj;
467
468 if (expect_false (AvFILLp (av) >= AvMAX (av)))
469 av_extend (av, AvMAX (av) + 1);
470
471 AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
472}
473
474/** load & save, init *******************************************************/
475
476static void
242load_state(pTHX_ Coro__State c) 477load_perl (pTHX_ Coro__State c)
243{ 478{
244 PL_dowarn = c->dowarn; 479 perl_slots *slot = c->slot;
480 c->slot = 0;
245 481
246 PL_curstackinfo = c->curstackinfo;
247 PL_curstack = c->curstack;
248 PL_mainstack = c->mainstack; 482 PL_mainstack = c->mainstack;
249 PL_stack_sp = c->stack_sp;
250 PL_op = c->op;
251 PL_curpad = c->curpad;
252 PL_stack_base = c->stack_base;
253 PL_stack_max = c->stack_max;
254 PL_tmps_stack = c->tmps_stack;
255 PL_tmps_floor = c->tmps_floor;
256 PL_tmps_ix = c->tmps_ix;
257 PL_tmps_max = c->tmps_max;
258 PL_markstack = c->markstack;
259 PL_markstack_ptr = c->markstack_ptr;
260 PL_markstack_max = c->markstack_max;
261 PL_scopestack = c->scopestack;
262 PL_scopestack_ix = c->scopestack_ix;
263 PL_scopestack_max = c->scopestack_max;
264 PL_savestack = c->savestack;
265 PL_savestack_ix = c->savestack_ix;
266 PL_savestack_max = c->savestack_max;
267 PL_retstack = c->retstack;
268 PL_retstack_ix = c->retstack_ix;
269 PL_retstack_max = c->retstack_max;
270 PL_curcop = c->curcop;
271 483
272 if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav); 484 GvSV (PL_defgv) = slot->defsv;
273 if (c->defsv) REPLACE_SV (DEFSV , c->defsv); 485 GvAV (PL_defgv) = slot->defav;
274 if (c->errsv) REPLACE_SV (ERRSV , c->errsv); 486 GvSV (PL_errgv) = slot->errsv;
487 GvSV (irsgv) = slot->irsgv;
488
489 #define VAR(name,type) PL_ ## name = slot->name;
490 # include "state.h"
491 #undef VAR
275 492
276 { 493 {
277 dSP; 494 dSP;
495
278 CV *cv; 496 CV *cv;
279 497
280 /* now do the ugly restore mess */ 498 /* now do the ugly restore mess */
281 while ((cv = (CV *)POPs)) 499 while (expect_true (cv = (CV *)POPs))
282 { 500 {
283 AV *padlist = (AV *)POPs;
284
285 if (padlist)
286 {
287 put_padlist (cv); /* mark this padlist as available */ 501 put_padlist (aTHX_ cv); /* mark this padlist as available */
288 CvPADLIST(cv) = padlist; 502 CvDEPTH (cv) = PTR2IV (POPs);
289#ifdef USE_THREADS 503 CvPADLIST (cv) = (AV *)POPs;
290 /*CvOWNER(cv) = (struct perl_thread *)POPs;*/
291#endif
292 }
293
294 ++CvDEPTH(cv);
295 } 504 }
296 505
297 PUTBACK; 506 PUTBACK;
298 } 507 }
299}
300 508
509 slf_frame = c->slf_frame;
510 coro_throw = c->throw;
511}
512
301static void 513static void
302save_state(pTHX_ Coro__State c, int flags) 514save_perl (pTHX_ Coro__State c)
303{ 515{
516 c->throw = coro_throw;
517 c->slf_frame = slf_frame;
518
304 { 519 {
305 dSP; 520 dSP;
306 I32 cxix = cxstack_ix; 521 I32 cxix = cxstack_ix;
307 PERL_CONTEXT *ccstk = cxstack; 522 PERL_CONTEXT *ccstk = cxstack;
308 PERL_SI *top_si = PL_curstackinfo; 523 PERL_SI *top_si = PL_curstackinfo;
… …
310 /* 525 /*
311 * the worst thing you can imagine happens first - we have to save 526 * the worst thing you can imagine happens first - we have to save
312 * (and reinitialize) all cv's in the whole callchain :( 527 * (and reinitialize) all cv's in the whole callchain :(
313 */ 528 */
314 529
315 PUSHs (Nullsv); 530 XPUSHs (Nullsv);
316 /* this loop was inspired by pp_caller */ 531 /* this loop was inspired by pp_caller */
317 for (;;) 532 for (;;)
318 { 533 {
319 do 534 while (expect_true (cxix >= 0))
320 { 535 {
321 PERL_CONTEXT *cx = &ccstk[cxix--]; 536 PERL_CONTEXT *cx = &ccstk[cxix--];
322 537
323 if (CxTYPE(cx) == CXt_SUB) 538 if (expect_true (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT))
324 { 539 {
325 CV *cv = cx->blk_sub.cv; 540 CV *cv = cx->blk_sub.cv;
541
326 if (CvDEPTH(cv)) 542 if (expect_true (CvDEPTH (cv)))
327 { 543 {
328#ifdef USE_THREADS
329 /*XPUSHs ((SV *)CvOWNER(cv));*/
330 /*CvOWNER(cv) = 0;*/
331 /*error must unlock this cv etc.. etc...*/
332#endif
333 EXTEND (SP, CvDEPTH(cv)*2); 544 EXTEND (SP, 3);
334
335 while (--CvDEPTH(cv))
336 {
337 /* this tells the restore code to increment CvDEPTH */
338 PUSHs (Nullsv);
339 PUSHs ((SV *)cv);
340 }
341
342 PUSHs ((SV *)CvPADLIST(cv)); 545 PUSHs ((SV *)CvPADLIST (cv));
546 PUSHs (INT2PTR (SV *, (IV)CvDEPTH (cv)));
343 PUSHs ((SV *)cv); 547 PUSHs ((SV *)cv);
344 548
345 get_padlist (cv); /* this is a monster */ 549 CvDEPTH (cv) = 0;
550 get_padlist (aTHX_ cv);
346 } 551 }
347 } 552 }
348 else if (CxTYPE(cx) == CXt_FORMAT) 553 }
554
555 if (expect_true (top_si->si_type == PERLSI_MAIN))
556 break;
557
558 top_si = top_si->si_prev;
559 ccstk = top_si->si_cxstack;
560 cxix = top_si->si_cxix;
561 }
562
563 PUTBACK;
564 }
565
566 /* allocate some space on the context stack for our purposes */
567 /* we manually unroll here, as usually 2 slots is enough */
568 if (SLOT_COUNT >= 1) CXINC;
569 if (SLOT_COUNT >= 2) CXINC;
570 if (SLOT_COUNT >= 3) CXINC;
571 {
572 int i;
573 for (i = 3; i < SLOT_COUNT; ++i)
574 CXINC;
575 }
576 cxstack_ix -= SLOT_COUNT; /* undo allocation */
577
578 c->mainstack = PL_mainstack;
579
580 {
581 perl_slots *slot = c->slot = (perl_slots *)(cxstack + cxstack_ix + 1);
582
583 slot->defav = GvAV (PL_defgv);
584 slot->defsv = DEFSV;
585 slot->errsv = ERRSV;
586 slot->irsgv = GvSV (irsgv);
587
588 #define VAR(name,type) slot->name = PL_ ## name;
589 # include "state.h"
590 #undef VAR
591 }
592}
593
594/*
595 * allocate various perl stacks. This is almost an exact copy
596 * of perl.c:init_stacks, except that it uses less memory
597 * on the (sometimes correct) assumption that coroutines do
598 * not usually need a lot of stackspace.
599 */
600#if CORO_PREFER_PERL_FUNCTIONS
601# define coro_init_stacks init_stacks
602#else
603static void
604coro_init_stacks (pTHX)
605{
606 PL_curstackinfo = new_stackinfo(32, 8);
607 PL_curstackinfo->si_type = PERLSI_MAIN;
608 PL_curstack = PL_curstackinfo->si_stack;
609 PL_mainstack = PL_curstack; /* remember in case we switch stacks */
610
611 PL_stack_base = AvARRAY(PL_curstack);
612 PL_stack_sp = PL_stack_base;
613 PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
614
615 New(50,PL_tmps_stack,32,SV*);
616 PL_tmps_floor = -1;
617 PL_tmps_ix = -1;
618 PL_tmps_max = 32;
619
620 New(54,PL_markstack,16,I32);
621 PL_markstack_ptr = PL_markstack;
622 PL_markstack_max = PL_markstack + 16;
623
624#ifdef SET_MARK_OFFSET
625 SET_MARK_OFFSET;
626#endif
627
628 New(54,PL_scopestack,8,I32);
629 PL_scopestack_ix = 0;
630 PL_scopestack_max = 8;
631
632 New(54,PL_savestack,24,ANY);
633 PL_savestack_ix = 0;
634 PL_savestack_max = 24;
635
636#if !PERL_VERSION_ATLEAST (5,10,0)
637 New(54,PL_retstack,4,OP*);
638 PL_retstack_ix = 0;
639 PL_retstack_max = 4;
640#endif
641}
642#endif
643
644/*
645 * destroy the stacks, the callchain etc...
646 */
647static void
648coro_destruct_stacks (pTHX)
649{
650 while (PL_curstackinfo->si_next)
651 PL_curstackinfo = PL_curstackinfo->si_next;
652
653 while (PL_curstackinfo)
654 {
655 PERL_SI *p = PL_curstackinfo->si_prev;
656
657 if (!IN_DESTRUCT)
658 SvREFCNT_dec (PL_curstackinfo->si_stack);
659
660 Safefree (PL_curstackinfo->si_cxstack);
661 Safefree (PL_curstackinfo);
662 PL_curstackinfo = p;
663 }
664
665 Safefree (PL_tmps_stack);
666 Safefree (PL_markstack);
667 Safefree (PL_scopestack);
668 Safefree (PL_savestack);
669#if !PERL_VERSION_ATLEAST (5,10,0)
670 Safefree (PL_retstack);
671#endif
672}
673
674static size_t
675coro_rss (pTHX_ struct coro *coro)
676{
677 size_t rss = sizeof (*coro);
678
679 if (coro->mainstack)
680 {
681 perl_slots tmp_slot;
682 perl_slots *slot;
683
684 if (coro->flags & CF_RUNNING)
685 {
686 slot = &tmp_slot;
687
688 #define VAR(name,type) slot->name = PL_ ## name;
689 # include "state.h"
690 #undef VAR
691 }
692 else
693 slot = coro->slot;
694
695 if (slot)
696 {
697 rss += sizeof (slot->curstackinfo);
698 rss += (slot->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
699 rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (slot->curstack)) * sizeof (SV *);
700 rss += slot->tmps_max * sizeof (SV *);
701 rss += (slot->markstack_max - slot->markstack_ptr) * sizeof (I32);
702 rss += slot->scopestack_max * sizeof (I32);
703 rss += slot->savestack_max * sizeof (ANY);
704
705#if !PERL_VERSION_ATLEAST (5,10,0)
706 rss += slot->retstack_max * sizeof (OP *);
707#endif
708 }
709 }
710
711 return rss;
712}
713
714/** coroutine stack handling ************************************************/
715
716static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
717static int (*orig_sigelem_set) (pTHX_ SV *sv, MAGIC *mg);
718static int (*orig_sigelem_clr) (pTHX_ SV *sv, MAGIC *mg);
719
720/* apparently < 5.8.8 */
721#ifndef MgPV_nolen_const
722#define MgPV_nolen_const(mg) (((((int)(mg)->mg_len)) == HEf_SVKEY) ? \
723 SvPV_nolen((SV*)((mg)->mg_ptr)) : \
724 (const char*)(mg)->mg_ptr)
725#endif
726
727/*
728 * This overrides the default magic get method of %SIG elements.
729 * The original one doesn't provide for reading back of PL_diehook/PL_warnhook
730 * and instead of tryign to save and restore the hash elements, we just provide
731 * readback here.
732 * We only do this when the hook is != 0, as they are often set to 0 temporarily,
733 * not expecting this to actually change the hook. This is a potential problem
734 * when a schedule happens then, but we ignore this.
735 */
736static int
737coro_sigelem_get (pTHX_ SV *sv, MAGIC *mg)
738{
739 const char *s = MgPV_nolen_const (mg);
740
741 if (*s == '_')
742 {
743 SV **svp = 0;
744
745 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
746 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
747
748 if (svp)
749 {
750 sv_setsv (sv, *svp ? *svp : &PL_sv_undef);
751 return 0;
752 }
753 }
754
755 return orig_sigelem_get ? orig_sigelem_get (aTHX_ sv, mg) : 0;
756}
757
758static int
759coro_sigelem_clr (pTHX_ SV *sv, MAGIC *mg)
760{
761 const char *s = MgPV_nolen_const (mg);
762
763 if (*s == '_')
764 {
765 SV **svp = 0;
766
767 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
768 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
769
770 if (svp)
771 {
772 SV *old = *svp;
773 *svp = 0;
774 SvREFCNT_dec (old);
775 return 0;
776 }
777 }
778
779 return orig_sigelem_clr ? orig_sigelem_clr (aTHX_ sv, mg) : 0;
780}
781
782static int
783coro_sigelem_set (pTHX_ SV *sv, MAGIC *mg)
784{
785 const char *s = MgPV_nolen_const (mg);
786
787 if (*s == '_')
788 {
789 SV **svp = 0;
790
791 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
792 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
793
794 if (svp)
795 {
796 SV *old = *svp;
797 *svp = newSVsv (sv);
798 SvREFCNT_dec (old);
799 return 0;
800 }
801 }
802
803 return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
804}
805
806static void
807prepare_nop (pTHX_ struct coro_transfer_args *ta)
808{
809 /* kind of mega-hacky, but works */
810 ta->next = ta->prev = (struct coro *)ta;
811}
812
813static int
814slf_check_nop (pTHX_ struct CoroSLF *frame)
815{
816 return 0;
817}
818
819static void NOINLINE /* noinline to keep it out of the transfer fast path */
820coro_setup (pTHX_ struct coro *coro)
821{
822 /*
823 * emulate part of the perl startup here.
824 */
825 coro_init_stacks (aTHX);
826
827 PL_runops = RUNOPS_DEFAULT;
828 PL_curcop = &PL_compiling;
829 PL_in_eval = EVAL_NULL;
830 PL_comppad = 0;
831 PL_curpm = 0;
832 PL_curpad = 0;
833 PL_localizing = 0;
834 PL_dirty = 0;
835 PL_restartop = 0;
836#if PERL_VERSION_ATLEAST (5,10,0)
837 PL_parser = 0;
838#endif
839
840 /* recreate the die/warn hooks */
841 PL_diehook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__DIE__" , sizeof ("__DIE__" ) - 1, 1), rv_diehook );
842 PL_warnhook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__WARN__", sizeof ("__WARN__") - 1, 1), rv_warnhook);
843
844 GvSV (PL_defgv) = newSV (0);
845 GvAV (PL_defgv) = coro->args; coro->args = 0;
846 GvSV (PL_errgv) = newSV (0);
847 GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
848 PL_rs = newSVsv (GvSV (irsgv));
849 PL_defoutgv = (GV *)SvREFCNT_inc_NN (stdoutgv);
850
851 {
852 dSP;
853 UNOP myop;
854
855 Zero (&myop, 1, UNOP);
856 myop.op_next = Nullop;
857 myop.op_flags = OPf_WANT_VOID;
858
859 PUSHMARK (SP);
860 XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));
861 PUTBACK;
862 PL_op = (OP *)&myop;
863 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
864 SPAGAIN;
865 }
866
867 /* this newly created coroutine might be run on an existing cctx which most
868 * likely was suspended in pp_slf, so we have to emulate entering pp_slf here.
869 */
870 slf_frame.prepare = prepare_nop; /* provide a nop function for an eventual pp_slf */
871 slf_frame.check = slf_check_nop; /* signal pp_slf to not repeat */
872
873 coro_throw = coro->throw;
874}
875
876static void
877coro_destruct (pTHX_ struct coro *coro)
878{
879 if (!IN_DESTRUCT)
880 {
881 /* restore all saved variables and stuff */
882 LEAVE_SCOPE (0);
883 assert (PL_tmps_floor == -1);
884
885 /* free all temporaries */
886 FREETMPS;
887 assert (PL_tmps_ix == -1);
888
889 /* unwind all extra stacks */
890 POPSTACK_TO (PL_mainstack);
891
892 /* unwind main stack */
893 dounwind (-1);
894 }
895
896 SvREFCNT_dec (GvSV (PL_defgv));
897 SvREFCNT_dec (GvAV (PL_defgv));
898 SvREFCNT_dec (GvSV (PL_errgv));
899 SvREFCNT_dec (PL_defoutgv);
900 SvREFCNT_dec (PL_rs);
901 SvREFCNT_dec (GvSV (irsgv));
902
903 SvREFCNT_dec (PL_diehook);
904 SvREFCNT_dec (PL_warnhook);
905
906 SvREFCNT_dec (coro->saved_deffh);
907 SvREFCNT_dec (coro_throw);
908
909 coro_destruct_stacks (aTHX);
910}
911
912INLINE void
913free_coro_mortal (pTHX)
914{
915 if (expect_true (coro_mortal))
916 {
917 SvREFCNT_dec (coro_mortal);
918 coro_mortal = 0;
919 }
920}
921
922static int
923runops_trace (pTHX)
924{
925 COP *oldcop = 0;
926 int oldcxix = -2;
927 struct coro *coro = SvSTATE_current; /* trace cctx is tied to specific coro */
928 coro_cctx *cctx = coro->cctx;
929
930 while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
931 {
932 PERL_ASYNC_CHECK ();
933
934 if (cctx->flags & CC_TRACE_ALL)
935 {
936 if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
937 {
938 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
939 SV **bot, **top;
940 AV *av = newAV (); /* return values */
941 SV **cb;
942 dSP;
943
944 GV *gv = CvGV (cx->blk_sub.cv);
945 SV *fullname = sv_2mortal (newSV (0));
946 if (isGV (gv))
947 gv_efullname3 (fullname, gv, 0);
948
949 bot = PL_stack_base + cx->blk_oldsp + 1;
950 top = cx->blk_gimme == G_ARRAY ? SP + 1
951 : cx->blk_gimme == G_SCALAR ? bot + 1
952 : bot;
953
954 av_extend (av, top - bot);
955 while (bot < top)
956 av_push (av, SvREFCNT_inc_NN (*bot++));
957
958 PL_runops = RUNOPS_DEFAULT;
959 ENTER;
960 SAVETMPS;
961 EXTEND (SP, 3);
962 PUSHMARK (SP);
963 PUSHs (&PL_sv_no);
964 PUSHs (fullname);
965 PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
966 PUTBACK;
967 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
968 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
969 SPAGAIN;
970 FREETMPS;
971 LEAVE;
972 PL_runops = runops_trace;
973 }
974
975 if (oldcop != PL_curcop)
976 {
977 oldcop = PL_curcop;
978
979 if (PL_curcop != &PL_compiling)
980 {
981 SV **cb;
982
983 if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
984 {
985 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
986
987 if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
988 {
989 runops_proc_t old_runops = PL_runops;
990 dSP;
991 GV *gv = CvGV (cx->blk_sub.cv);
992 SV *fullname = sv_2mortal (newSV (0));
993
994 if (isGV (gv))
995 gv_efullname3 (fullname, gv, 0);
996
997 PL_runops = RUNOPS_DEFAULT;
998 ENTER;
999 SAVETMPS;
1000 EXTEND (SP, 3);
1001 PUSHMARK (SP);
1002 PUSHs (&PL_sv_yes);
1003 PUSHs (fullname);
1004 PUSHs (CxHASARGS (cx) ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
1005 PUTBACK;
1006 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
1007 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
1008 SPAGAIN;
1009 FREETMPS;
1010 LEAVE;
1011 PL_runops = runops_trace;
1012 }
1013
1014 oldcxix = cxstack_ix;
1015 }
1016
1017 if (cctx->flags & CC_TRACE_LINE)
1018 {
1019 dSP;
1020
1021 PL_runops = RUNOPS_DEFAULT;
1022 ENTER;
1023 SAVETMPS;
1024 EXTEND (SP, 3);
1025 PL_runops = RUNOPS_DEFAULT;
1026 PUSHMARK (SP);
1027 PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
1028 PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
1029 PUTBACK;
1030 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
1031 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
1032 SPAGAIN;
1033 FREETMPS;
1034 LEAVE;
1035 PL_runops = runops_trace;
1036 }
1037 }
1038 }
1039 }
1040 }
1041
1042 TAINT_NOT;
1043 return 0;
1044}
1045
1046static void
1047prepare_set_stacklevel (struct coro_transfer_args *ta, struct coro_cctx *cctx)
1048{
1049 ta->prev = (struct coro *)cctx;
1050 ta->next = 0;
1051}
1052
1053/* inject a fake call to Coro::State::_cctx_init into the execution */
1054/* _cctx_init should be careful, as it could be called at almost any time */
1055/* during execution of a perl program */
1056/* also initialises PL_top_env */
1057static void NOINLINE
1058cctx_prepare (pTHX_ coro_cctx *cctx)
1059{
1060 dSP;
1061 UNOP myop;
1062
1063 PL_top_env = &PL_start_env;
1064
1065 if (cctx->flags & CC_TRACE)
1066 PL_runops = runops_trace;
1067
1068 Zero (&myop, 1, UNOP);
1069 myop.op_next = PL_op;
1070 myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
1071
1072 PUSHMARK (SP);
1073 EXTEND (SP, 2);
1074 PUSHs (sv_2mortal (newSViv ((IV)cctx)));
1075 PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
1076 PUTBACK;
1077 PL_op = (OP *)&myop;
1078 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
1079 SPAGAIN;
1080}
1081
1082/* the tail of transfer: execute stuff we can only do after a transfer */
1083INLINE void
1084transfer_tail (pTHX)
1085{
1086 free_coro_mortal (aTHX);
1087}
1088
1089/*
1090 * this is a _very_ stripped down perl interpreter ;)
1091 */
1092static void
1093cctx_run (void *arg)
1094{
1095#ifdef USE_ITHREADS
1096# if CORO_PTHREAD
1097 PERL_SET_CONTEXT (coro_thx);
1098# endif
1099#endif
1100 {
1101 dTHX;
1102
1103 /* normally we would need to skip the entersub here */
1104 /* not doing so will re-execute it, which is exactly what we want */
1105 /* PL_nop = PL_nop->op_next */
1106
1107 /* inject a fake subroutine call to cctx_init */
1108 cctx_prepare (aTHX_ (coro_cctx *)arg);
1109
1110 /* cctx_run is the alternative tail of transfer() */
1111 transfer_tail (aTHX);
1112
1113 /* somebody or something will hit me for both perl_run and PL_restartop */
1114 PL_restartop = PL_op;
1115 perl_run (PL_curinterp);
1116
1117 /*
1118 * If perl-run returns we assume exit() was being called or the coro
1119 * fell off the end, which seems to be the only valid (non-bug)
1120 * reason for perl_run to return. We try to exit by jumping to the
1121 * bootstrap-time "top" top_env, as we cannot restore the "main"
1122 * coroutine as Coro has no such concept
1123 */
1124 PL_top_env = main_top_env;
1125 JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
1126 }
1127}
1128
1129static coro_cctx *
1130cctx_new ()
1131{
1132 coro_cctx *cctx;
1133
1134 ++cctx_count;
1135 New (0, cctx, 1, coro_cctx);
1136
1137 cctx->gen = cctx_gen;
1138 cctx->flags = 0;
1139 cctx->idle_sp = 0; /* can be accessed by transfer between cctx_run and set_stacklevel, on throw */
1140
1141 return cctx;
1142}
1143
1144/* create a new cctx only suitable as source */
1145static coro_cctx *
1146cctx_new_empty ()
1147{
1148 coro_cctx *cctx = cctx_new ();
1149
1150 cctx->sptr = 0;
1151 coro_create (&cctx->cctx, 0, 0, 0, 0);
1152
1153 return cctx;
1154}
1155
1156/* create a new cctx suitable as destination/running a perl interpreter */
1157static coro_cctx *
1158cctx_new_run ()
1159{
1160 coro_cctx *cctx = cctx_new ();
1161 void *stack_start;
1162 size_t stack_size;
1163
1164#if HAVE_MMAP
1165 cctx->ssize = ((cctx_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
1166 /* mmap supposedly does allocate-on-write for us */
1167 cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
1168
1169 if (cctx->sptr != (void *)-1)
1170 {
1171 #if CORO_STACKGUARD
1172 mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
1173 #endif
1174 stack_start = (char *)cctx->sptr + CORO_STACKGUARD * PAGESIZE;
1175 stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
1176 cctx->flags |= CC_MAPPED;
1177 }
1178 else
1179#endif
1180 {
1181 cctx->ssize = cctx_stacksize * (long)sizeof (long);
1182 New (0, cctx->sptr, cctx_stacksize, long);
1183
1184 if (!cctx->sptr)
1185 {
1186 perror ("FATAL: unable to allocate stack for coroutine, exiting.");
1187 _exit (EXIT_FAILURE);
1188 }
1189
1190 stack_start = cctx->sptr;
1191 stack_size = cctx->ssize;
1192 }
1193
1194 #if CORO_USE_VALGRIND
1195 cctx->valgrind_id = VALGRIND_STACK_REGISTER ((char *)stack_start, (char *)stack_start + stack_size);
1196 #endif
1197
1198 coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);
1199
1200 return cctx;
1201}
1202
1203static void
1204cctx_destroy (coro_cctx *cctx)
1205{
1206 if (!cctx)
1207 return;
1208
1209 --cctx_count;
1210 coro_destroy (&cctx->cctx);
1211
1212 /* coro_transfer creates new, empty cctx's */
1213 if (cctx->sptr)
1214 {
1215 #if CORO_USE_VALGRIND
1216 VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
1217 #endif
1218
1219#if HAVE_MMAP
1220 if (cctx->flags & CC_MAPPED)
1221 munmap (cctx->sptr, cctx->ssize);
1222 else
1223#endif
1224 Safefree (cctx->sptr);
1225 }
1226
1227 Safefree (cctx);
1228}
1229
1230/* wether this cctx should be destructed */
1231#define CCTX_EXPIRED(cctx) ((cctx)->gen != cctx_gen || ((cctx)->flags & CC_NOREUSE))
1232
1233static coro_cctx *
1234cctx_get (pTHX)
1235{
1236 while (expect_true (cctx_first))
1237 {
1238 coro_cctx *cctx = cctx_first;
1239 cctx_first = cctx->next;
1240 --cctx_idle;
1241
1242 if (expect_true (!CCTX_EXPIRED (cctx)))
1243 return cctx;
1244
1245 cctx_destroy (cctx);
1246 }
1247
1248 return cctx_new_run ();
1249}
1250
1251static void
1252cctx_put (coro_cctx *cctx)
1253{
1254 assert (("FATAL: cctx_put called on non-initialised cctx in Coro (please report)", cctx->sptr));
1255
1256 /* free another cctx if overlimit */
1257 if (expect_false (cctx_idle >= cctx_max_idle))
1258 {
1259 coro_cctx *first = cctx_first;
1260 cctx_first = first->next;
1261 --cctx_idle;
1262
1263 cctx_destroy (first);
1264 }
1265
1266 ++cctx_idle;
1267 cctx->next = cctx_first;
1268 cctx_first = cctx;
1269}
1270
1271/** coroutine switching *****************************************************/
1272
1273static void
1274transfer_check (pTHX_ struct coro *prev, struct coro *next)
1275{
1276 /* TODO: throwing up here is considered harmful */
1277
1278 if (expect_true (prev != next))
1279 {
1280 if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
1281 croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states,");
1282
1283 if (expect_false (next->flags & CF_RUNNING))
1284 croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states,");
1285
1286 if (expect_false (next->flags & CF_DESTROYED))
1287 croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states,");
1288
1289#if !PERL_VERSION_ATLEAST (5,10,0)
1290 if (expect_false (PL_lex_state != LEX_NOTPARSING))
1291 croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version,");
1292#endif
1293 }
1294}
1295
1296/* always use the TRANSFER macro */
1297static void NOINLINE /* noinline so we have a fixed stackframe */
1298transfer (pTHX_ struct coro *prev, struct coro *next, int force_cctx)
1299{
1300 dSTACKLEVEL;
1301
1302 /* sometimes transfer is only called to set idle_sp */
1303 if (expect_false (!next))
1304 {
1305 ((coro_cctx *)prev)->idle_sp = (void *)stacklevel;
1306 assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
1307 }
1308 else if (expect_true (prev != next))
1309 {
1310 coro_cctx *prev__cctx;
1311
1312 if (expect_false (prev->flags & CF_NEW))
1313 {
1314 /* create a new empty/source context */
1315 prev->cctx = cctx_new_empty ();
1316 prev->flags &= ~CF_NEW;
1317 prev->flags |= CF_RUNNING;
1318 }
1319
1320 prev->flags &= ~CF_RUNNING;
1321 next->flags |= CF_RUNNING;
1322
1323 /* first get rid of the old state */
1324 save_perl (aTHX_ prev);
1325
1326 if (expect_false (next->flags & CF_NEW))
1327 {
1328 /* need to start coroutine */
1329 next->flags &= ~CF_NEW;
1330 /* setup coroutine call */
1331 coro_setup (aTHX_ next);
1332 }
1333 else
1334 load_perl (aTHX_ next);
1335
1336 prev__cctx = prev->cctx;
1337
1338 /* possibly untie and reuse the cctx */
1339 if (expect_true (
1340 prev__cctx->idle_sp == (void *)stacklevel
1341 && !(prev__cctx->flags & CC_TRACE)
1342 && !force_cctx
1343 ))
1344 {
1345 /* I assume that stacklevel is a stronger indicator than PL_top_env changes */
1346 assert (("FATAL: current top_env must equal previous top_env in Coro (please report)", PL_top_env == prev__cctx->idle_te));
1347
1348 prev->cctx = 0;
1349
1350 /* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
1351 /* without this the next cctx_get might destroy the prev__cctx while still in use */
1352 if (expect_false (CCTX_EXPIRED (prev__cctx)))
1353 if (!next->cctx)
1354 next->cctx = cctx_get (aTHX);
1355
1356 cctx_put (prev__cctx);
1357 }
1358
1359 ++next->usecount;
1360
1361 if (expect_true (!next->cctx))
1362 next->cctx = cctx_get (aTHX);
1363
1364 if (expect_false (prev__cctx != next->cctx))
1365 {
1366 prev__cctx->top_env = PL_top_env;
1367 PL_top_env = next->cctx->top_env;
1368 coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
1369 }
1370
1371 transfer_tail (aTHX);
1372 }
1373}
1374
1375#define TRANSFER(ta, force_cctx) transfer (aTHX_ (ta).prev, (ta).next, (force_cctx))
1376#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
1377
1378/** high level stuff ********************************************************/
1379
1380static int
1381coro_state_destroy (pTHX_ struct coro *coro)
1382{
1383 if (coro->flags & CF_DESTROYED)
1384 return 0;
1385
1386 if (coro->on_destroy)
1387 coro->on_destroy (aTHX_ coro);
1388
1389 coro->flags |= CF_DESTROYED;
1390
1391 if (coro->flags & CF_READY)
1392 {
1393 /* reduce nready, as destroying a ready coro effectively unreadies it */
1394 /* alternative: look through all ready queues and remove the coro */
1395 --coro_nready;
1396 }
1397 else
1398 coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
1399
1400 if (coro->mainstack && coro->mainstack != main_mainstack)
1401 {
1402 struct coro temp;
1403
1404 assert (("FATAL: tried to destroy currently running coroutine (please report)", !(coro->flags & CF_RUNNING)));
1405
1406 save_perl (aTHX_ &temp);
1407 load_perl (aTHX_ coro);
1408
1409 coro_destruct (aTHX_ coro);
1410
1411 load_perl (aTHX_ &temp);
1412
1413 coro->slot = 0;
1414 }
1415
1416 cctx_destroy (coro->cctx);
1417 SvREFCNT_dec (coro->args);
1418
1419 if (coro->next) coro->next->prev = coro->prev;
1420 if (coro->prev) coro->prev->next = coro->next;
1421 if (coro == coro_first) coro_first = coro->next;
1422
1423 return 1;
1424}
1425
1426static int
1427coro_state_free (pTHX_ SV *sv, MAGIC *mg)
1428{
1429 struct coro *coro = (struct coro *)mg->mg_ptr;
1430 mg->mg_ptr = 0;
1431
1432 coro->hv = 0;
1433
1434 if (--coro->refcnt < 0)
1435 {
1436 coro_state_destroy (aTHX_ coro);
1437 Safefree (coro);
1438 }
1439
1440 return 0;
1441}
1442
1443static int
1444coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
1445{
1446 struct coro *coro = (struct coro *)mg->mg_ptr;
1447
1448 ++coro->refcnt;
1449
1450 return 0;
1451}
1452
1453static MGVTBL coro_state_vtbl = {
1454 0, 0, 0, 0,
1455 coro_state_free,
1456 0,
1457#ifdef MGf_DUP
1458 coro_state_dup,
1459#else
1460# define MGf_DUP 0
1461#endif
1462};
1463
1464static void
1465prepare_transfer (pTHX_ struct coro_transfer_args *ta, SV *prev_sv, SV *next_sv)
1466{
1467 ta->prev = SvSTATE (prev_sv);
1468 ta->next = SvSTATE (next_sv);
1469 TRANSFER_CHECK (*ta);
1470}
1471
1472static void
1473api_transfer (pTHX_ SV *prev_sv, SV *next_sv)
1474{
1475 struct coro_transfer_args ta;
1476
1477 prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
1478 TRANSFER (ta, 1);
1479}
1480
1481/** Coro ********************************************************************/
1482
1483INLINE void
1484coro_enq (pTHX_ struct coro *coro)
1485{
1486 av_push (coro_ready [coro->prio - PRIO_MIN], SvREFCNT_inc_NN (coro->hv));
1487}
1488
1489INLINE SV *
1490coro_deq (pTHX)
1491{
1492 int prio;
1493
1494 for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
1495 if (AvFILLp (coro_ready [prio]) >= 0)
1496 return av_shift (coro_ready [prio]);
1497
1498 return 0;
1499}
1500
1501static int
1502api_ready (pTHX_ SV *coro_sv)
1503{
1504 struct coro *coro;
1505 SV *sv_hook;
1506 void (*xs_hook)(void);
1507
1508 if (SvROK (coro_sv))
1509 coro_sv = SvRV (coro_sv);
1510
1511 coro = SvSTATE (coro_sv);
1512
1513 if (coro->flags & CF_READY)
1514 return 0;
1515
1516 coro->flags |= CF_READY;
1517
1518 sv_hook = coro_nready ? 0 : coro_readyhook;
1519 xs_hook = coro_nready ? 0 : coroapi.readyhook;
1520
1521 coro_enq (aTHX_ coro);
1522 ++coro_nready;
1523
1524 if (sv_hook)
1525 {
1526 dSP;
1527
1528 ENTER;
1529 SAVETMPS;
1530
1531 PUSHMARK (SP);
1532 PUTBACK;
1533 call_sv (sv_hook, G_DISCARD);
1534 SPAGAIN;
1535
1536 FREETMPS;
1537 LEAVE;
1538 }
1539
1540 if (xs_hook)
1541 xs_hook ();
1542
1543 return 1;
1544}
1545
1546static int
1547api_is_ready (pTHX_ SV *coro_sv)
1548{
1549 return !!(SvSTATE (coro_sv)->flags & CF_READY);
1550}
1551
1552INLINE void
1553prepare_schedule (pTHX_ struct coro_transfer_args *ta)
1554{
1555 SV *prev_sv, *next_sv;
1556
1557 for (;;)
1558 {
1559 next_sv = coro_deq (aTHX);
1560
1561 /* nothing to schedule: call the idle handler */
1562 if (expect_false (!next_sv))
1563 {
1564 dSP;
1565
1566 ENTER;
1567 SAVETMPS;
1568
1569 PUSHMARK (SP);
1570 PUTBACK;
1571 call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
1572 SPAGAIN;
1573
1574 FREETMPS;
1575 LEAVE;
1576 continue;
1577 }
1578
1579 ta->next = SvSTATE_hv (next_sv);
1580
1581 /* cannot transfer to destroyed coros, skip and look for next */
1582 if (expect_false (ta->next->flags & CF_DESTROYED))
1583 {
1584 SvREFCNT_dec (next_sv);
1585 /* coro_nready has already been taken care of by destroy */
1586 continue;
1587 }
1588
1589 --coro_nready;
1590 break;
1591 }
1592
1593 /* free this only after the transfer */
1594 prev_sv = SvRV (coro_current);
1595 ta->prev = SvSTATE_hv (prev_sv);
1596 TRANSFER_CHECK (*ta);
1597 assert (("FATAL: next coroutine isn't marked as ready in Coro (please report)", ta->next->flags & CF_READY));
1598 ta->next->flags &= ~CF_READY;
1599 SvRV_set (coro_current, next_sv);
1600
1601 free_coro_mortal (aTHX);
1602 coro_mortal = prev_sv;
1603}
1604
1605INLINE void
1606prepare_cede (pTHX_ struct coro_transfer_args *ta)
1607{
1608 api_ready (aTHX_ coro_current);
1609 prepare_schedule (aTHX_ ta);
1610}
1611
1612INLINE void
1613prepare_cede_notself (pTHX_ struct coro_transfer_args *ta)
1614{
1615 SV *prev = SvRV (coro_current);
1616
1617 if (coro_nready)
1618 {
1619 prepare_schedule (aTHX_ ta);
1620 api_ready (aTHX_ prev);
1621 }
1622 else
1623 prepare_nop (aTHX_ ta);
1624}
1625
1626static void
1627api_schedule (pTHX)
1628{
1629 struct coro_transfer_args ta;
1630
1631 prepare_schedule (aTHX_ &ta);
1632 TRANSFER (ta, 1);
1633}
1634
1635static int
1636api_cede (pTHX)
1637{
1638 struct coro_transfer_args ta;
1639
1640 prepare_cede (aTHX_ &ta);
1641
1642 if (expect_true (ta.prev != ta.next))
1643 {
1644 TRANSFER (ta, 1);
1645 return 1;
1646 }
1647 else
1648 return 0;
1649}
1650
1651static int
1652api_cede_notself (pTHX)
1653{
1654 if (coro_nready)
1655 {
1656 struct coro_transfer_args ta;
1657
1658 prepare_cede_notself (aTHX_ &ta);
1659 TRANSFER (ta, 1);
1660 return 1;
1661 }
1662 else
1663 return 0;
1664}
1665
1666static void
1667api_trace (pTHX_ SV *coro_sv, int flags)
1668{
1669 struct coro *coro = SvSTATE (coro_sv);
1670
1671 if (flags & CC_TRACE)
1672 {
1673 if (!coro->cctx)
1674 coro->cctx = cctx_new_run ();
1675 else if (!(coro->cctx->flags & CC_TRACE))
1676 croak ("cannot enable tracing on coroutine with custom stack,");
1677
1678 coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
1679 }
1680 else if (coro->cctx && coro->cctx->flags & CC_TRACE)
1681 {
1682 coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
1683
1684 if (coro->flags & CF_RUNNING)
1685 PL_runops = RUNOPS_DEFAULT;
1686 else
1687 coro->slot->runops = RUNOPS_DEFAULT;
1688 }
1689}
1690
1691/*****************************************************************************/
1692/* schedule-like-function opcode (SLF) */
1693
1694static UNOP slf_restore; /* restore stack as entersub did, for first-re-run */
1695static const CV *slf_cv;
1696static SV **slf_argv;
1697static int slf_argc, slf_arga; /* count, allocated */
1698static I32 slf_ax; /* top of stack, for restore */
1699
1700/* this restores the stack in the case we patched the entersub, to */
1701/* recreate the stack frame as perl will on following calls */
1702/* since entersub cleared the stack */
1703static OP *
1704pp_restore (pTHX)
1705{
1706 int i;
1707 SV **SP = PL_stack_base + slf_ax;
1708
1709 PUSHMARK (SP);
1710
1711 EXTEND (SP, slf_argc + 1);
1712
1713 for (i = 0; i < slf_argc; ++i)
1714 PUSHs (sv_2mortal (slf_argv [i]));
1715
1716 PUSHs ((SV *)CvGV (slf_cv));
1717
1718 RETURNOP (slf_restore.op_first);
1719}
1720
1721static void
1722slf_prepare_set_stacklevel (pTHX_ struct coro_transfer_args *ta)
1723{
1724 prepare_set_stacklevel (ta, (struct coro_cctx *)slf_frame.data);
1725}
1726
1727static void
1728slf_init_set_stacklevel (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1729{
1730 assert (("FATAL: set_stacklevel needs the coro cctx as sole argument", items == 1));
1731
1732 frame->prepare = slf_prepare_set_stacklevel;
1733 frame->check = slf_check_nop;
1734 frame->data = (void *)SvIV (arg [0]);
1735}
1736
1737static void
1738slf_prepare_transfer (pTHX_ struct coro_transfer_args *ta)
1739{
1740 SV **arg = (SV **)slf_frame.data;
1741
1742 prepare_transfer (aTHX_ ta, arg [0], arg [1]);
1743}
1744
1745static void
1746slf_init_transfer (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1747{
1748 if (items != 2)
1749 croak ("Coro::State::transfer (prev, next) expects two arguments, not %d,", items);
1750
1751 frame->prepare = slf_prepare_transfer;
1752 frame->check = slf_check_nop;
1753 frame->data = (void *)arg; /* let's hope it will stay valid */
1754}
1755
1756static void
1757slf_init_schedule (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1758{
1759 frame->prepare = prepare_schedule;
1760 frame->check = slf_check_nop;
1761}
1762
1763static void
1764slf_init_cede (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1765{
1766 frame->prepare = prepare_cede;
1767 frame->check = slf_check_nop;
1768}
1769
1770static void
1771slf_init_cede_notself (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
1772{
1773 frame->prepare = prepare_cede_notself;
1774 frame->check = slf_check_nop;
1775}
1776
1777/* we hijack an hopefully unused CV flag for our purposes */
1778#define CVf_SLF 0x4000
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 {
1846 dSP;
1847 SV **bot = PL_stack_base + checkmark;
1848 int gimme = GIMME_V;
1849
1850 /* make sure we put something on the stack in scalar context */
1851 if (gimme == G_SCALAR)
1852 {
1853 if (sp == bot)
1854 XPUSHs (&PL_sv_undef);
1855
1856 SP = bot + 1;
1857 }
1858
1859 PUTBACK;
1860 }
1861
1862 /* exception handling */
1863 if (expect_false (coro_throw))
1864 {
1865 SV *exception = sv_2mortal (coro_throw);
1866
1867 coro_throw = 0;
1868 sv_setsv (ERRSV, exception);
1869 croak (0);
1870 }
1871
1872 return NORMAL;
1873}
1874
1875static void
1876api_execute_slf (pTHX_ CV *cv, coro_slf_cb init_cb, I32 ax)
1877{
1878 int i;
1879 SV **arg = PL_stack_base + ax;
1880 int items = PL_stack_sp - arg + 1;
1881
1882 assert (("FATAL: SLF call with illegal CV value", !CvANON (cv)));
1883
1884 if (PL_op->op_ppaddr != PL_ppaddr [OP_ENTERSUB]
1885 && PL_op->op_ppaddr != pp_slf)
1886 croak ("FATAL: Coro SLF calls can only be made normally, not via goto or any other means, caught");
1887
1888 CvFLAGS (cv) |= CVf_SLF;
1889 CvXSUBANY (cv).any_ptr = (void *)init_cb;
1890 slf_cv = cv;
1891
1892 /* we patch the op, and then re-run the whole call */
1893 /* we have to put the same argument on the stack for this to work */
1894 /* and this will be done by pp_restore */
1895 slf_restore.op_next = (OP *)&slf_restore;
1896 slf_restore.op_type = OP_CUSTOM;
1897 slf_restore.op_ppaddr = pp_restore;
1898 slf_restore.op_first = PL_op;
1899
1900 slf_ax = ax - 1; /* undo the ax++ inside dAXMARK */
1901
1902 if (PL_op->op_flags & OPf_STACKED)
1903 {
1904 if (items > slf_arga)
1905 {
1906 slf_arga = items;
1907 free (slf_argv);
1908 slf_argv = malloc (slf_arga * sizeof (SV *));
1909 }
1910
1911 slf_argc = items;
1912
1913 for (i = 0; i < items; ++i)
1914 slf_argv [i] = SvREFCNT_inc (arg [i]);
1915 }
1916 else
1917 slf_argc = 0;
1918
1919 PL_op->op_ppaddr = pp_slf;
1920 PL_op->op_type = OP_CUSTOM; /* maybe we should leave it at entersub? */
1921
1922 PL_op = (OP *)&slf_restore;
1923}
1924
1925/*****************************************************************************/
1926/* PerlIO::cede */
1927
1928typedef struct
1929{
1930 PerlIOBuf base;
1931 NV next, every;
1932} PerlIOCede;
1933
1934static IV
1935PerlIOCede_pushed (pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
1936{
1937 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
1938
1939 self->every = SvCUR (arg) ? SvNV (arg) : 0.01;
1940 self->next = nvtime () + self->every;
1941
1942 return PerlIOBuf_pushed (aTHX_ f, mode, Nullsv, tab);
1943}
1944
1945static SV *
1946PerlIOCede_getarg (pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
1947{
1948 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
1949
1950 return newSVnv (self->every);
1951}
1952
1953static IV
1954PerlIOCede_flush (pTHX_ PerlIO *f)
1955{
1956 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
1957 double now = nvtime ();
1958
1959 if (now >= self->next)
1960 {
1961 api_cede (aTHX);
1962 self->next = now + self->every;
1963 }
1964
1965 return PerlIOBuf_flush (aTHX_ f);
1966}
1967
1968static PerlIO_funcs PerlIO_cede =
1969{
1970 sizeof(PerlIO_funcs),
1971 "cede",
1972 sizeof(PerlIOCede),
1973 PERLIO_K_DESTRUCT | PERLIO_K_RAW,
1974 PerlIOCede_pushed,
1975 PerlIOBuf_popped,
1976 PerlIOBuf_open,
1977 PerlIOBase_binmode,
1978 PerlIOCede_getarg,
1979 PerlIOBase_fileno,
1980 PerlIOBuf_dup,
1981 PerlIOBuf_read,
1982 PerlIOBuf_unread,
1983 PerlIOBuf_write,
1984 PerlIOBuf_seek,
1985 PerlIOBuf_tell,
1986 PerlIOBuf_close,
1987 PerlIOCede_flush,
1988 PerlIOBuf_fill,
1989 PerlIOBase_eof,
1990 PerlIOBase_error,
1991 PerlIOBase_clearerr,
1992 PerlIOBase_setlinebuf,
1993 PerlIOBuf_get_base,
1994 PerlIOBuf_bufsiz,
1995 PerlIOBuf_get_ptr,
1996 PerlIOBuf_get_cnt,
1997 PerlIOBuf_set_ptrcnt,
1998};
1999
2000/*****************************************************************************/
2001/* Coro::Semaphore */
2002
2003static void
2004coro_semaphore_adjust (pTHX_ AV *av, IV adjust)
2005{
2006 SV *count_sv = AvARRAY (av)[0];
2007 IV count = SvIVX (count_sv);
2008
2009 count += adjust;
2010 SvIVX (count_sv) = count;
2011
2012 /* now wake up as many waiters as are expected to lock */
2013 while (count > 0 && AvFILLp (av) > 0)
2014 {
2015 SV *cb;
2016
2017 /* swap first two elements so we can shift a waiter */
2018 AvARRAY (av)[0] = AvARRAY (av)[1];
2019 AvARRAY (av)[1] = count_sv;
2020 cb = av_shift (av);
2021
2022 if (SvOBJECT (cb))
2023 api_ready (aTHX_ cb);
2024 else
2025 croak ("callbacks not yet supported");
2026
2027 SvREFCNT_dec (cb);
2028
2029 --count;
2030 }
2031}
2032
2033static void
2034coro_semaphore_on_destroy (pTHX_ struct coro *coro)
2035{
2036 /* call $sem->adjust (0) to possibly wake up some other waiters */
2037 coro_semaphore_adjust (aTHX_ (AV *)coro->slf_frame.data, 0);
2038}
2039
2040static int
2041slf_check_semaphore_down (pTHX_ struct CoroSLF *frame)
2042{
2043 AV *av = (AV *)frame->data;
2044 SV *count_sv = AvARRAY (av)[0];
2045
2046 if (SvIVX (count_sv) > 0)
2047 {
2048 SvSTATE_current->on_destroy = 0;
2049 SvIVX (count_sv) = SvIVX (count_sv) - 1;
2050 return 0;
2051 }
2052 else
2053 {
2054 int i;
2055 /* if we were woken up but can't down, we look through the whole */
2056 /* waiters list and only add us if we aren't in there already */
2057 /* this avoids some degenerate memory usage cases */
2058
2059 for (i = 1; i <= AvFILLp (av); ++i)
2060 if (AvARRAY (av)[i] == SvRV (coro_current))
2061 return 1;
2062
2063 av_push (av, SvREFCNT_inc (SvRV (coro_current)));
2064 return 1;
2065 }
2066}
2067
2068static void
2069slf_init_semaphore_down (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2070{
2071 AV *av = (AV *)SvRV (arg [0]);
2072
2073 if (SvIVX (AvARRAY (av)[0]) > 0)
2074 {
2075 frame->data = (void *)av;
2076 frame->prepare = prepare_nop;
2077 SvSTATE_current->on_destroy = coro_semaphore_on_destroy;
2078 }
2079 else
2080 {
2081 av_push (av, SvREFCNT_inc (SvRV (coro_current)));
2082
2083 frame->data = (void *)sv_2mortal (SvREFCNT_inc ((SV *)av));
2084 frame->prepare = prepare_schedule;
2085
2086 /* to avoid race conditions when a woken-up coro gets terminated */
2087 /* we arrange for a temporary on_destroy that calls adjust (0) */
2088 assert (!SvSTATE_current->on_destroy);//D
2089 SvSTATE_current->on_destroy = coro_semaphore_on_destroy;
2090 }
2091
2092 frame->check = slf_check_semaphore_down;
2093
2094}
2095
2096/*****************************************************************************/
2097/* gensub: simple closure generation utility */
2098
2099#define GENSUB_ARG CvXSUBANY (cv).any_ptr
2100
2101/* create a closure from XS, returns a code reference */
2102/* the arg can be accessed via GENSUB_ARG from the callback */
2103/* the callback must use dXSARGS/XSRETURN */
2104static SV *
2105gensub (pTHX_ void (*xsub)(pTHX_ CV *), void *arg)
2106{
2107 CV *cv = (CV *)newSV (0);
2108
2109 sv_upgrade ((SV *)cv, SVt_PVCV);
2110
2111 CvANON_on (cv);
2112 CvISXSUB_on (cv);
2113 CvXSUB (cv) = xsub;
2114 GENSUB_ARG = arg;
2115
2116 return newRV_noinc ((SV *)cv);
2117}
2118
2119/*****************************************************************************/
2120/* Coro::AIO */
2121
2122#define CORO_MAGIC_type_aio PERL_MAGIC_ext
2123
2124/* helper storage struct */
2125struct io_state
2126{
2127 int errorno;
2128 I32 laststype; /* U16 in 5.10.0 */
2129 int laststatval;
2130 Stat_t statcache;
2131};
2132
2133static void
2134coro_aio_callback (pTHX_ CV *cv)
2135{
2136 dXSARGS;
2137 AV *state = (AV *)GENSUB_ARG;
2138 SV *coro = av_pop (state);
2139 SV *data_sv = newSV (sizeof (struct io_state));
2140
2141 av_extend (state, items);
2142
2143 sv_upgrade (data_sv, SVt_PV);
2144 SvCUR_set (data_sv, sizeof (struct io_state));
2145 SvPOK_only (data_sv);
2146
2147 {
2148 struct io_state *data = (struct io_state *)SvPVX (data_sv);
2149
2150 data->errorno = errno;
2151 data->laststype = PL_laststype;
2152 data->laststatval = PL_laststatval;
2153 data->statcache = PL_statcache;
2154 }
2155
2156 /* now build the result vector out of all the parameters and the data_sv */
2157 {
2158 int i;
2159
2160 for (i = 0; i < items; ++i)
2161 av_push (state, SvREFCNT_inc_NN (ST (i)));
2162 }
2163
2164 av_push (state, data_sv);
2165
2166 api_ready (aTHX_ coro);
2167 SvREFCNT_dec (coro);
2168 SvREFCNT_dec ((AV *)state);
2169}
2170
2171static int
2172slf_check_aio_req (pTHX_ struct CoroSLF *frame)
2173{
2174 AV *state = (AV *)frame->data;
2175
2176 /* one element that is an RV? repeat! */
2177 if (AvFILLp (state) == 0 && SvROK (AvARRAY (state)[0]))
2178 return 1;
2179
2180 /* restore status */
2181 {
2182 SV *data_sv = av_pop (state);
2183 struct io_state *data = (struct io_state *)SvPVX (data_sv);
2184
2185 errno = data->errorno;
2186 PL_laststype = data->laststype;
2187 PL_laststatval = data->laststatval;
2188 PL_statcache = data->statcache;
2189
2190 SvREFCNT_dec (data_sv);
2191 }
2192
2193 /* push result values */
2194 {
2195 dSP;
2196 int i;
2197
2198 EXTEND (SP, AvFILLp (state) + 1);
2199 for (i = 0; i <= AvFILLp (state); ++i)
2200 PUSHs (sv_2mortal (SvREFCNT_inc_NN (AvARRAY (state)[i])));
2201
2202 PUTBACK;
2203 }
2204
2205 return 0;
2206}
2207
2208static void
2209slf_init_aio_req (pTHX_ struct CoroSLF *frame, CV *cv, SV **arg, int items)
2210{
2211 AV *state = (AV *)sv_2mortal ((SV *)newAV ());
2212 SV *coro_hv = SvRV (coro_current);
2213 struct coro *coro = SvSTATE_hv (coro_hv);
2214
2215 /* put our coroutine id on the state arg */
2216 av_push (state, SvREFCNT_inc_NN (coro_hv));
2217
2218 /* first see whether we have a non-zero priority and set it as AIO prio */
2219 if (coro->prio)
2220 {
2221 dSP;
2222
2223 static SV *prio_cv;
2224 static SV *prio_sv;
2225
2226 if (expect_false (!prio_cv))
2227 {
2228 prio_cv = (SV *)get_cv ("IO::AIO::aioreq_pri", 0);
2229 prio_sv = newSViv (0);
2230 }
2231
2232 PUSHMARK (SP);
2233 sv_setiv (prio_sv, coro->prio);
2234 XPUSHs (prio_sv);
2235
2236 PUTBACK;
2237 call_sv (prio_cv, G_VOID | G_DISCARD);
2238 }
2239
2240 /* now call the original request */
2241 {
2242 dSP;
2243 CV *req = (CV *)CORO_MAGIC_NN ((SV *)cv, CORO_MAGIC_type_aio)->mg_obj;
2244 int i;
2245
2246 PUSHMARK (SP);
2247
2248 /* first push all args to the stack */
2249 EXTEND (SP, items + 1);
2250
2251 for (i = 0; i < items; ++i)
2252 PUSHs (arg [i]);
2253
2254 /* now push the callback closure */
2255 PUSHs (sv_2mortal (gensub (aTHX_ coro_aio_callback, (void *)SvREFCNT_inc_NN ((SV *)state))));
2256
2257 /* now call the AIO function - we assume our request is uncancelable */
2258 PUTBACK;
2259 call_sv ((SV *)req, G_VOID | G_DISCARD);
2260 }
2261
2262 /* now that the requets is going, we loop toll we have a result */
2263 frame->data = (void *)state;
2264 frame->prepare = prepare_schedule;
2265 frame->check = slf_check_aio_req;
2266}
2267
2268static void
2269coro_aio_req_xs (pTHX_ CV *cv)
2270{
2271 dXSARGS;
2272
2273 CORO_EXECUTE_SLF_XS (slf_init_aio_req);
2274
2275 XSRETURN_EMPTY;
2276}
2277
2278/*****************************************************************************/
2279
2280MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
2281
2282PROTOTYPES: DISABLE
2283
2284BOOT:
2285{
2286#ifdef USE_ITHREADS
2287# if CORO_PTHREAD
2288 coro_thx = PERL_GET_CONTEXT;
2289# endif
2290#endif
2291 BOOT_PAGESIZE;
2292
2293 irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
2294 stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
2295
2296 orig_sigelem_get = PL_vtbl_sigelem.svt_get; PL_vtbl_sigelem.svt_get = coro_sigelem_get;
2297 orig_sigelem_set = PL_vtbl_sigelem.svt_set; PL_vtbl_sigelem.svt_set = coro_sigelem_set;
2298 orig_sigelem_clr = PL_vtbl_sigelem.svt_clear; PL_vtbl_sigelem.svt_clear = coro_sigelem_clr;
2299
2300 hv_sig = coro_get_hv (aTHX_ "SIG", TRUE);
2301 rv_diehook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::diehook" , 0, SVt_PVCV));
2302 rv_warnhook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::warnhook", 0, SVt_PVCV));
2303
2304 coro_state_stash = gv_stashpv ("Coro::State", TRUE);
2305
2306 newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
2307 newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
2308 newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
2309 newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
2310
2311 main_mainstack = PL_mainstack;
2312 main_top_env = PL_top_env;
2313
2314 while (main_top_env->je_prev)
2315 main_top_env = main_top_env->je_prev;
2316
2317 {
2318 SV *slf = sv_2mortal (newSViv (PTR2IV (pp_slf)));
2319
2320 if (!PL_custom_op_names) PL_custom_op_names = newHV ();
2321 hv_store_ent (PL_custom_op_names, slf,
2322 newSVpv ("coro_slf", 0), 0);
2323
2324 if (!PL_custom_op_descs) PL_custom_op_descs = newHV ();
2325 hv_store_ent (PL_custom_op_descs, slf,
2326 newSVpv ("coro schedule like function", 0), 0);
2327 }
2328
2329 coroapi.ver = CORO_API_VERSION;
2330 coroapi.rev = CORO_API_REVISION;
2331
2332 coroapi.transfer = api_transfer;
2333
2334 coroapi.sv_state = SvSTATE_;
2335 coroapi.execute_slf = api_execute_slf;
2336 coroapi.prepare_nop = prepare_nop;
2337 coroapi.prepare_schedule = prepare_schedule;
2338 coroapi.prepare_cede = prepare_cede;
2339 coroapi.prepare_cede_notself = prepare_cede_notself;
2340
2341 {
2342 SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0);
2343
2344 if (!svp) croak ("Time::HiRes is required");
2345 if (!SvIOK (*svp)) croak ("Time::NVtime isn't a function pointer");
2346
2347 nvtime = INT2PTR (double (*)(), SvIV (*svp));
2348 }
2349
2350 assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
2351}
2352
2353SV *
2354new (char *klass, ...)
2355 CODE:
2356{
2357 struct coro *coro;
2358 MAGIC *mg;
2359 HV *hv;
2360 int i;
2361
2362 Newz (0, coro, 1, struct coro);
2363 coro->args = newAV ();
2364 coro->flags = CF_NEW;
2365
2366 if (coro_first) coro_first->prev = coro;
2367 coro->next = coro_first;
2368 coro_first = coro;
2369
2370 coro->hv = hv = newHV ();
2371 mg = sv_magicext ((SV *)hv, 0, CORO_MAGIC_type_state, &coro_state_vtbl, (char *)coro, 0);
2372 mg->mg_flags |= MGf_DUP;
2373 RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
2374
2375 av_extend (coro->args, items - 1);
2376 for (i = 1; i < items; i++)
2377 av_push (coro->args, newSVsv (ST (i)));
2378}
2379 OUTPUT:
2380 RETVAL
2381
2382void
2383_set_stacklevel (...)
2384 CODE:
2385 CORO_EXECUTE_SLF_XS (slf_init_set_stacklevel);
2386
2387void
2388transfer (...)
2389 PROTOTYPE: $$
2390 CODE:
2391 CORO_EXECUTE_SLF_XS (slf_init_transfer);
2392
2393bool
2394_destroy (SV *coro_sv)
2395 CODE:
2396 RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
2397 OUTPUT:
2398 RETVAL
2399
2400void
2401_exit (int code)
2402 PROTOTYPE: $
2403 CODE:
2404 _exit (code);
2405
2406int
2407cctx_stacksize (int new_stacksize = 0)
2408 PROTOTYPE: ;$
2409 CODE:
2410 RETVAL = cctx_stacksize;
2411 if (new_stacksize)
2412 {
2413 cctx_stacksize = new_stacksize;
2414 ++cctx_gen;
2415 }
2416 OUTPUT:
2417 RETVAL
2418
2419int
2420cctx_max_idle (int max_idle = 0)
2421 PROTOTYPE: ;$
2422 CODE:
2423 RETVAL = cctx_max_idle;
2424 if (max_idle > 1)
2425 cctx_max_idle = max_idle;
2426 OUTPUT:
2427 RETVAL
2428
2429int
2430cctx_count ()
2431 PROTOTYPE:
2432 CODE:
2433 RETVAL = cctx_count;
2434 OUTPUT:
2435 RETVAL
2436
2437int
2438cctx_idle ()
2439 PROTOTYPE:
2440 CODE:
2441 RETVAL = cctx_idle;
2442 OUTPUT:
2443 RETVAL
2444
2445void
2446list ()
2447 PROTOTYPE:
2448 PPCODE:
2449{
2450 struct coro *coro;
2451 for (coro = coro_first; coro; coro = coro->next)
2452 if (coro->hv)
2453 XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
2454}
2455
2456void
2457call (Coro::State coro, SV *coderef)
2458 ALIAS:
2459 eval = 1
2460 CODE:
2461{
2462 if (coro->mainstack && ((coro->flags & CF_RUNNING) || coro->slot))
2463 {
2464 struct coro temp;
2465
2466 if (!(coro->flags & CF_RUNNING))
349 { 2467 {
350 /* I never used formats, so how should I know how these are implemented? */ 2468 PUTBACK;
351 /* my bold guess is as a simple, plain sub... */ 2469 save_perl (aTHX_ &temp);
352 croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats"); 2470 load_perl (aTHX_ coro);
2471 }
2472
2473 {
2474 dSP;
2475 ENTER;
2476 SAVETMPS;
2477 PUTBACK;
2478 PUSHSTACK;
2479 PUSHMARK (SP);
2480
2481 if (ix)
2482 eval_sv (coderef, 0);
2483 else
2484 call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
2485
2486 POPSTACK;
2487 SPAGAIN;
2488 FREETMPS;
2489 LEAVE;
2490 PUTBACK;
2491 }
2492
2493 if (!(coro->flags & CF_RUNNING))
2494 {
2495 save_perl (aTHX_ coro);
2496 load_perl (aTHX_ &temp);
2497 SPAGAIN;
353 } 2498 }
354 } 2499 }
355 while (cxix >= 0); 2500}
356 2501
357 if (top_si->si_type == PERLSI_MAIN) 2502SV *
358 break; 2503is_ready (Coro::State coro)
2504 PROTOTYPE: $
2505 ALIAS:
2506 is_ready = CF_READY
2507 is_running = CF_RUNNING
2508 is_new = CF_NEW
2509 is_destroyed = CF_DESTROYED
2510 CODE:
2511 RETVAL = boolSV (coro->flags & ix);
2512 OUTPUT:
2513 RETVAL
359 2514
360 top_si = top_si->si_prev; 2515void
361 ccstk = top_si->si_cxstack; 2516throw (Coro::State self, SV *throw = &PL_sv_undef)
362 cxix = top_si->si_cxix; 2517 PROTOTYPE: $;$
2518 CODE:
2519{
2520 struct coro *current = SvSTATE_current;
2521 SV **throwp = self == current ? &coro_throw : &self->throw;
2522 SvREFCNT_dec (*throwp);
2523 *throwp = SvOK (throw) ? newSVsv (throw) : 0;
2524}
2525
2526void
2527api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
2528 PROTOTYPE: $;$
2529 C_ARGS: aTHX_ coro, flags
2530
2531SV *
2532has_cctx (Coro::State coro)
2533 PROTOTYPE: $
2534 CODE:
2535 RETVAL = boolSV (!!coro->cctx);
2536 OUTPUT:
2537 RETVAL
2538
2539int
2540is_traced (Coro::State coro)
2541 PROTOTYPE: $
2542 CODE:
2543 RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
2544 OUTPUT:
2545 RETVAL
2546
2547UV
2548rss (Coro::State coro)
2549 PROTOTYPE: $
2550 ALIAS:
2551 usecount = 1
2552 CODE:
2553 switch (ix)
2554 {
2555 case 0: RETVAL = coro_rss (aTHX_ coro); break;
2556 case 1: RETVAL = coro->usecount; break;
363 } 2557 }
2558 OUTPUT:
2559 RETVAL
364 2560
365 PUTBACK; 2561void
366 } 2562force_cctx ()
2563 PROTOTYPE:
2564 CODE:
2565 SvSTATE_current->cctx->idle_sp = 0;
367 2566
368 c->defav = flags & SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0; 2567void
369 c->defsv = flags & SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0; 2568swap_defsv (Coro::State self)
370 c->errsv = flags & SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0; 2569 PROTOTYPE: $
371 2570 ALIAS:
372 /* I have not the slightest idea of why av_reify is necessary */ 2571 swap_defav = 1
373 /* but if it's missing the defav contents magically get replaced sometimes */ 2572 CODE:
374 if (c->defav) 2573 if (!self->slot)
375 av_reify (c->defav); 2574 croak ("cannot swap state with coroutine that has no saved state,");
376 2575 else
377 c->dowarn = PL_dowarn;
378
379 c->curstackinfo = PL_curstackinfo;
380 c->curstack = PL_curstack;
381 c->mainstack = PL_mainstack;
382 c->stack_sp = PL_stack_sp;
383 c->op = PL_op;
384 c->curpad = PL_curpad;
385 c->stack_base = PL_stack_base;
386 c->stack_max = PL_stack_max;
387 c->tmps_stack = PL_tmps_stack;
388 c->tmps_floor = PL_tmps_floor;
389 c->tmps_ix = PL_tmps_ix;
390 c->tmps_max = PL_tmps_max;
391 c->markstack = PL_markstack;
392 c->markstack_ptr = PL_markstack_ptr;
393 c->markstack_max = PL_markstack_max;
394 c->scopestack = PL_scopestack;
395 c->scopestack_ix = PL_scopestack_ix;
396 c->scopestack_max = PL_scopestack_max;
397 c->savestack = PL_savestack;
398 c->savestack_ix = PL_savestack_ix;
399 c->savestack_max = PL_savestack_max;
400 c->retstack = PL_retstack;
401 c->retstack_ix = PL_retstack_ix;
402 c->retstack_max = PL_retstack_max;
403 c->curcop = PL_curcop;
404}
405
406/*
407 * destroy the stacks, the callchain etc...
408 * still there is a memleak of 128 bytes...
409 */
410STATIC void
411destroy_stacks(pTHX)
412{
413 /* is this ugly, I ask? */
414 while (PL_scopestack_ix)
415 LEAVE;
416
417 /* sure it is, but more important: is it correct?? :/ */
418 while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
419 FREETMPS;
420
421 while (PL_curstackinfo->si_next)
422 PL_curstackinfo = PL_curstackinfo->si_next;
423
424 while (PL_curstackinfo)
425 {
426 PERL_SI *p = PL_curstackinfo->si_prev;
427
428 { 2576 {
429 dSP; 2577 SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
430 SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack); 2578 SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
431 PUTBACK; /* possibly superfluous */ 2579
2580 SV *tmp = *src; *src = *dst; *dst = tmp;
432 } 2581 }
433 2582
434 dounwind(-1);
435 2583
436 SvREFCNT_dec(PL_curstackinfo->si_stack); 2584MODULE = Coro::State PACKAGE = Coro
437 Safefree(PL_curstackinfo->si_cxstack);
438 Safefree(PL_curstackinfo);
439 PL_curstackinfo = p;
440 }
441 2585
442 Safefree(PL_tmps_stack); 2586BOOT:
443 Safefree(PL_markstack);
444 Safefree(PL_scopestack);
445 Safefree(PL_savestack);
446 Safefree(PL_retstack);
447}
448
449STATIC void
450transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
451{ 2587{
452 dSP; 2588 int i;
453 2589
454 if (prev != next) 2590 av_async_pool = coro_get_av (aTHX_ "Coro::async_pool", TRUE);
455 { 2591 sv_pool_rss = coro_get_sv (aTHX_ "Coro::POOL_RSS" , TRUE);
456 /* 2592 sv_pool_size = coro_get_sv (aTHX_ "Coro::POOL_SIZE" , TRUE);
457 * this could be done in newprocess which would lead to 2593
458 * extremely elegant and fast (just SAVE/LOAD) 2594 coro_current = coro_get_sv (aTHX_ "Coro::current", FALSE);
459 * code here, but lazy allocation of stacks has also 2595 SvREADONLY_on (coro_current);
460 * some virtues and the overhead of the if() is nil. 2596
461 */ 2597 coro_stash = gv_stashpv ("Coro", TRUE);
462 if (next->mainstack) 2598
2599 newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
2600 newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
2601 newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
2602 newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
2603 newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
2604 newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
2605
2606 for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
2607 coro_ready[i] = newAV ();
2608
463 { 2609 {
464 SAVE (prev, flags); 2610 SV *sv = coro_get_sv (aTHX_ "Coro::API", TRUE);
465 LOAD (next); 2611
466 /* mark this state as in-use */ 2612 coroapi.schedule = api_schedule;
467 next->mainstack = 0; 2613 coroapi.cede = api_cede;
468 next->tmps_ix = -2; 2614 coroapi.cede_notself = api_cede_notself;
2615 coroapi.ready = api_ready;
2616 coroapi.is_ready = api_is_ready;
2617 coroapi.nready = coro_nready;
2618 coroapi.current = coro_current;
2619
2620 GCoroAPI = &coroapi;
2621 sv_setiv (sv, (IV)&coroapi);
2622 SvREADONLY_on (sv);
469 } 2623 }
470 else if (next->tmps_ix == -2) 2624}
2625
2626void
2627schedule (...)
2628 CODE:
2629 CORO_EXECUTE_SLF_XS (slf_init_schedule);
2630
2631void
2632cede (...)
2633 CODE:
2634 CORO_EXECUTE_SLF_XS (slf_init_cede);
2635
2636void
2637cede_notself (...)
2638 CODE:
2639 CORO_EXECUTE_SLF_XS (slf_init_cede_notself);
2640
2641void
2642_set_current (SV *current)
2643 PROTOTYPE: $
2644 CODE:
2645 SvREFCNT_dec (SvRV (coro_current));
2646 SvRV_set (coro_current, SvREFCNT_inc_NN (SvRV (current)));
2647
2648void
2649_set_readyhook (SV *hook)
2650 PROTOTYPE: $
2651 CODE:
2652 SvREFCNT_dec (coro_readyhook);
2653 coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;
2654
2655int
2656prio (Coro::State coro, int newprio = 0)
2657 PROTOTYPE: $;$
2658 ALIAS:
2659 nice = 1
2660 CODE:
2661{
2662 RETVAL = coro->prio;
2663
2664 if (items > 1)
471 { 2665 {
472 croak ("tried to transfer to running coroutine"); 2666 if (ix)
2667 newprio = coro->prio - newprio;
2668
2669 if (newprio < PRIO_MIN) newprio = PRIO_MIN;
2670 if (newprio > PRIO_MAX) newprio = PRIO_MAX;
2671
2672 coro->prio = newprio;
473 } 2673 }
474 else 2674}
2675 OUTPUT:
2676 RETVAL
2677
2678SV *
2679ready (SV *self)
2680 PROTOTYPE: $
2681 CODE:
2682 RETVAL = boolSV (api_ready (aTHX_ self));
2683 OUTPUT:
2684 RETVAL
2685
2686int
2687nready (...)
2688 PROTOTYPE:
2689 CODE:
2690 RETVAL = coro_nready;
2691 OUTPUT:
2692 RETVAL
2693
2694# for async_pool speedup
2695void
2696_pool_1 (SV *cb)
2697 CODE:
2698{
2699 HV *hv = (HV *)SvRV (coro_current);
2700 struct coro *coro = SvSTATE_hv ((SV *)hv);
2701 AV *defav = GvAV (PL_defgv);
2702 SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
2703 AV *invoke_av;
2704 int i, len;
2705
2706 if (!invoke)
475 { 2707 {
476 /* 2708 SV *old = PL_diehook;
477 * emulate part of the perl startup here. 2709 PL_diehook = 0;
478 */
479 UNOP myop;
480
481 SAVE (prev, -1); /* first get rid of the old state */
482
483 init_stacks (); /* from perl.c */
484 SPAGAIN;
485
486 PL_op = (OP *)&myop;
487 /*PL_curcop = 0;*/
488 SvREFCNT_dec (GvAV (PL_defgv)); 2710 SvREFCNT_dec (old);
489 GvAV (PL_defgv) = next->args; 2711 croak ("\3async_pool terminate\2\n");
490
491 Zero(&myop, 1, UNOP);
492 myop.op_next = Nullop;
493 myop.op_flags = OPf_WANT_VOID;
494
495 PUSHMARK(SP);
496 XPUSHs ((SV*)get_cv(SUB_INIT, TRUE));
497 /*
498 * the next line is slightly wrong, as PL_op->op_next
499 * is actually being executed so we skip the first op.
500 * that doesn't matter, though, since it is only
501 * pp_nextstate and we never return...
502 * ah yes, and I don't care anyways ;)
503 */
504 PUTBACK;
505 PL_op = pp_entersub(aTHX);
506 SPAGAIN;
507
508 ENTER; /* necessary e.g. for dounwind */
509 } 2712 }
510 }
511}
512 2713
2714 SvREFCNT_dec (coro->saved_deffh);
2715 coro->saved_deffh = SvREFCNT_inc_NN ((SV *)PL_defoutgv);
2716
2717 hv_store (hv, "desc", sizeof ("desc") - 1,
2718 newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
2719
2720 invoke_av = (AV *)SvRV (invoke);
2721 len = av_len (invoke_av);
2722
2723 sv_setsv (cb, AvARRAY (invoke_av)[0]);
2724
2725 if (len > 0)
2726 {
2727 av_fill (defav, len - 1);
2728 for (i = 0; i < len; ++i)
2729 av_store (defav, i, SvREFCNT_inc_NN (AvARRAY (invoke_av)[i + 1]));
2730 }
2731}
2732
2733void
2734_pool_2 (SV *cb)
2735 CODE:
2736{
2737 HV *hv = (HV *)SvRV (coro_current);
2738 struct coro *coro = SvSTATE_hv ((SV *)hv);
2739
2740 sv_setsv (cb, &PL_sv_undef);
2741
2742 SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
2743 coro->saved_deffh = 0;
2744
2745 if (coro_rss (aTHX_ coro) > SvUV (sv_pool_rss)
2746 || av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
2747 {
2748 SV *old = PL_diehook;
2749 PL_diehook = 0;
2750 SvREFCNT_dec (old);
2751 croak ("\3async_pool terminate\2\n");
2752 }
2753
2754 av_clear (GvAV (PL_defgv));
2755 hv_store (hv, "desc", sizeof ("desc") - 1,
2756 newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
2757
2758 coro->prio = 0;
2759
2760 if (coro->cctx && (coro->cctx->flags & CC_TRACE))
2761 api_trace (aTHX_ coro_current, 0);
2762
2763 av_push (av_async_pool, newSVsv (coro_current));
2764}
2765
2766
513MODULE = Coro::State PACKAGE = Coro::State 2767MODULE = Coro::State PACKAGE = PerlIO::cede
514
515PROTOTYPES: ENABLE
516 2768
517BOOT: 2769BOOT:
518{ /* {} necessary for stoopid perl-5.6.x */ 2770 PerlIO_define_layer (aTHX_ &PerlIO_cede);
519 HV * stash = gv_stashpvn("Coro::State", 10, TRUE);
520 2771
521 newCONSTSUB (stash, "SAVE_DEFAV", newSViv (SAVE_DEFAV));
522 newCONSTSUB (stash, "SAVE_DEFSV", newSViv (SAVE_DEFSV));
523 newCONSTSUB (stash, "SAVE_ERRSV", newSViv (SAVE_ERRSV));
524 2772
525 if (!padlist_cache) 2773MODULE = Coro::State PACKAGE = Coro::Semaphore
526 padlist_cache = newHV ();
527}
528 2774
529Coro::State 2775SV *
530_newprocess(args) 2776new (SV *klass, SV *count_ = 0)
2777 CODE:
2778{
2779 /* a semaphore contains a counter IV in $sem->[0] and any waiters after that */
2780 AV *av = newAV ();
531 SV * args 2781 SV **ary;
532 PROTOTYPE: $ 2782
2783 /* unfortunately, building manually saves memory */
2784 Newx (ary, 2, SV *);
2785 AvALLOC (av) = ary;
2786 AvARRAY (av) = ary;
2787 AvMAX (av) = 1;
2788 AvFILLp (av) = 0;
2789 ary [0] = newSViv (count_ && SvOK (count_) ? SvIV (count_) : 1);
2790
2791 RETVAL = sv_bless (newRV_noinc ((SV *)av), GvSTASH (CvGV (cv)));
2792}
2793 OUTPUT:
2794 RETVAL
2795
2796SV *
2797count (SV *self)
2798 CODE:
2799 RETVAL = newSVsv (AvARRAY ((AV *)SvRV (self))[0]);
2800 OUTPUT:
2801 RETVAL
2802
2803void
2804up (SV *self, int adjust = 1)
2805 ALIAS:
2806 adjust = 1
533 CODE: 2807 CODE:
534 Coro__State coro; 2808 coro_semaphore_adjust (aTHX_ (AV *)SvRV (self), ix ? adjust : 1);
535
536 if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
537 croak ("Coro::State::_newprocess expects an arrayref");
538
539 New (0, coro, 1, struct coro);
540
541 coro->mainstack = 0; /* actual work is done inside transfer */
542 coro->args = (AV *)SvREFCNT_inc (SvRV (args));
543
544 RETVAL = coro;
545 OUTPUT:
546 RETVAL
547 2809
548void 2810void
549transfer(prev, next, flags = SAVE_ALL) 2811down (SV *self)
550 Coro::State_or_hashref prev
551 Coro::State_or_hashref next
552 int flags
553 PROTOTYPE: @
554 CODE: 2812 CODE:
555 2813 CORO_EXECUTE_SLF_XS (slf_init_semaphore_down);
556 transfer (aTHX_ prev, next, flags);
557 2814
558void 2815void
559DESTROY(coro) 2816try (SV *self)
560 Coro::State coro
561 CODE: 2817 PPCODE:
2818{
2819 AV *av = (AV *)SvRV (self);
2820 SV *count_sv = AvARRAY (av)[0];
2821 IV count = SvIVX (count_sv);
562 2822
563 if (coro->mainstack) 2823 if (count > 0)
564 { 2824 {
565 struct coro temp; 2825 --count;
566 2826 SvIVX (count_sv) = count;
567 SAVE(aTHX_ (&temp), SAVE_ALL); 2827 XSRETURN_YES;
568 LOAD(aTHX_ coro);
569
570 destroy_stacks ();
571
572 LOAD((&temp)); /* this will get rid of defsv etc.. */
573 } 2828 }
574 2829 else
575 Safefree (coro); 2830 XSRETURN_NO;
2831}
576 2832
577void 2833void
578flush() 2834waiters (SV *self)
2835 CODE:
2836{
2837 AV *av = (AV *)SvRV (self);
2838
2839 if (GIMME_V == G_SCALAR)
2840 XPUSHs (sv_2mortal (newSVsv (AvARRAY (av)[0])));
2841 else
2842 {
2843 int i;
2844 EXTEND (SP, AvFILLp (av) + 1 - 1);
2845 for (i = 1; i <= AvFILLp (av); ++i)
2846 PUSHs (newSVsv (AvARRAY (av)[i]));
2847 }
2848}
2849
2850
2851MODULE = Coro::State PACKAGE = Coro::AnyEvent
2852
2853BOOT:
2854 sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);
2855
2856void
2857_schedule (...)
579 CODE: 2858 CODE:
580#ifdef MAY_FLUSH 2859{
581 flush_padlist_cache (); 2860 static int incede;
582#endif
583 2861
2862 api_cede_notself (aTHX);
2863
2864 ++incede;
2865 while (coro_nready >= incede && api_cede (aTHX))
2866 ;
2867
2868 sv_setsv (sv_activity, &PL_sv_undef);
2869 if (coro_nready >= incede)
2870 {
2871 PUSHMARK (SP);
2872 PUTBACK;
2873 call_pv ("Coro::AnyEvent::_activity", G_DISCARD | G_EVAL);
2874 SPAGAIN;
2875 }
2876
2877 --incede;
2878}
2879
2880
584MODULE = Coro::State PACKAGE = Coro::Cont 2881MODULE = Coro::State PACKAGE = Coro::AIO
585
586# this is dirty (do you hear me?) and should be in it's own .xs
587 2882
588void 2883void
589result(...) 2884_register (char *target, char *proto, SV *req)
590 PROTOTYPE: @ 2885 CODE:
591 CODE: 2886{
592 static SV *returnstk; 2887 HV *st;
593 SV *sv; 2888 GV *gvp;
594 AV *defav = GvAV (PL_defgv); 2889 CV *req_cv = sv_2cv (req, &st, &gvp, 0);
595 struct coro *prev, *next; 2890 /* newXSproto doesn't return the CV on 5.8 */
2891 CV *slf_cv = newXS (target, coro_aio_req_xs, __FILE__);
2892 sv_setpv ((SV *)slf_cv, proto);
2893 sv_magicext ((SV *)slf_cv, (SV *)req_cv, CORO_MAGIC_type_aio, 0, 0, 0);
2894}
596 2895
597 if (!returnstk)
598 returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
599
600 /* set up @_ -- ugly */
601 av_clear (defav);
602 av_fill (defav, items - 1);
603 while (items--)
604 av_store (defav, items, SvREFCNT_inc (ST(items)));
605
606 mg_get (returnstk); /* isn't documentation wrong for mg_get? */
607 sv = av_pop ((AV *)SvRV (returnstk));
608 prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
609 next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
610 SvREFCNT_dec (sv);
611 transfer(prev, next, 0);
612

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