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Comparing Coro/Coro/State.xs (file contents):
Revision 1.2 by root, Sun Jul 15 02:35:52 2001 UTC vs.
Revision 1.107 by root, Mon Nov 27 02:15:51 2006 UTC

1#include "libcoro/coro.c"
2
1#include "EXTERN.h" 3#include "EXTERN.h"
2#include "perl.h" 4#include "perl.h"
3#include "XSUB.h" 5#include "XSUB.h"
4 6
7#include "patchlevel.h"
8
9#if USE_VALGRIND
10# include <valgrind/valgrind.h>
11#endif
12
13#define PERL_VERSION_ATLEAST(a,b,c) \
14 (PERL_REVISION > (a) \
15 || (PERL_REVISION == (a) \
16 && (PERL_VERSION > (b) \
17 || (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
18
19#if !PERL_VERSION_ATLEAST (5,6,0)
20# ifndef PL_ppaddr
21# define PL_ppaddr ppaddr
22# endif
23# ifndef call_sv
24# define call_sv perl_call_sv
25# endif
26# ifndef get_sv
27# define get_sv perl_get_sv
28# endif
29# ifndef get_cv
30# define get_cv perl_get_cv
31# endif
32# ifndef IS_PADGV
33# define IS_PADGV(v) 0
34# endif
35# ifndef IS_PADCONST
36# define IS_PADCONST(v) 0
37# endif
38#endif
39
40#include <stdio.h>
41#include <errno.h>
42
43#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
44# undef STACKGUARD
45#endif
46
47#ifndef STACKGUARD
48# define STACKGUARD 0
49#endif
50
51#ifdef HAVE_MMAP
52# include <unistd.h>
53# include <sys/mman.h>
54# ifndef MAP_ANONYMOUS
55# ifdef MAP_ANON
56# define MAP_ANONYMOUS MAP_ANON
57# else
58# undef HAVE_MMAP
59# endif
60# endif
61# include <limits.h>
62# ifndef PAGESIZE
63# define PAGESIZE pagesize
64# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
65static long pagesize;
66# else
67# define BOOT_PAGESIZE (void)0
68# endif
69#else
70# define PAGESIZE 0
71# define BOOT_PAGESIZE (void)0
72#endif
73
74/* The next macro should declare a variable stacklevel that contains and approximation
75 * to the current C stack pointer. Its property is that it changes with each call
76 * and should be unique. */
77#define dSTACKLEVEL int stacklevel
78#define STACKLEVEL ((void *)&stacklevel)
79
80#define IN_DESTRUCT (PL_main_cv == Nullcv)
81
82#if __GNUC__ >= 3
83# define attribute(x) __attribute__(x)
84#else
85# define attribute(x)
86#endif
87
88#define NOINLINE attribute ((noinline))
89
90#include "CoroAPI.h"
91
92#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
93
94#ifdef USE_ITHREADS
95static perl_mutex coro_mutex;
96# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
97# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
98#else
99# define LOCK (void)0
100# define UNLOCK (void)0
101#endif
102
103static struct CoroAPI coroapi;
104static AV *main_mainstack; /* used to differentiate between $main and others */
105static HV *coro_state_stash, *coro_stash;
106static SV *coro_mortal; /* will be freed after next transfer */
107
108static struct coro_cctx *cctx_first;
109static int cctx_count, cctx_idle;
110
111/* this is a structure representing a c-level coroutine */
112typedef struct coro_cctx {
113 struct coro_cctx *next;
114
115 /* the stack */
116 void *sptr;
117 long ssize; /* positive == mmap, otherwise malloc */
118
119 /* cpu state */
120 void *idle_sp; /* sp of top-level transfer/schedule/cede call */
121 JMPENV *top_env;
122 coro_context cctx;
123
124#if USE_VALGRIND
125 int valgrind_id;
126#endif
127} coro_cctx;
128
129/* this is a structure representing a perl-level coroutine */
5struct coro { 130struct coro {
131 /* the c coroutine allocated to this perl coroutine, if any */
132 coro_cctx *cctx;
133
134 /* data associated with this coroutine (initial args) */
135 AV *args;
136 int refcnt;
137
138 /* optionally saved, might be zero */
139 AV *defav;
140 SV *defsv;
141 SV *errsv;
142
143 /* saved global state not related to stacks */
6 U8 dowarn; 144 U8 dowarn;
7 145 I32 in_eval;
146
147 /* the stacks and related info (callchain etc..) */
8 PERL_SI *curstackinfo; 148 PERL_SI *curstackinfo;
9 AV *curstack; 149 AV *curstack;
10 AV *mainstack; 150 AV *mainstack;
11 SV **stack_sp; 151 SV **stack_sp;
12 OP *op; 152 OP *op;
13 SV **curpad; 153 SV **curpad;
154 AV *comppad;
155 CV *compcv;
14 SV **stack_base; 156 SV **stack_base;
15 SV **stack_max; 157 SV **stack_max;
16 SV **tmps_stack; 158 SV **tmps_stack;
17 I32 tmps_floor; 159 I32 tmps_floor;
18 I32 tmps_ix; 160 I32 tmps_ix;
… …
27 I32 savestack_ix; 169 I32 savestack_ix;
28 I32 savestack_max; 170 I32 savestack_max;
29 OP **retstack; 171 OP **retstack;
30 I32 retstack_ix; 172 I32 retstack_ix;
31 I32 retstack_max; 173 I32 retstack_max;
174 PMOP *curpm;
32 COP *curcop; 175 COP *curcop;
33 176
34 AV *defav; 177 /* coro process data */
35 178 int prio;
36 SV *proc;
37}; 179};
38 180
39typedef struct coro *Coro__State; 181typedef struct coro *Coro__State;
40typedef struct coro *Coro__State_or_hashref; 182typedef struct coro *Coro__State_or_hashref;
41 183
42#define SAVE(c) \ 184static AV *
43 c->dowarn = PL_dowarn; \ 185coro_clone_padlist (CV *cv)
44 c->curstackinfo = PL_curstackinfo; \
45 c->curstack = PL_curstack; \
46 c->mainstack = PL_mainstack; \
47 c->stack_sp = PL_stack_sp; \
48 c->op = PL_op; \
49 c->curpad = PL_curpad; \
50 c->stack_base = PL_stack_base; \
51 c->stack_max = PL_stack_max; \
52 c->tmps_stack = PL_tmps_stack; \
53 c->tmps_floor = PL_tmps_floor; \
54 c->tmps_ix = PL_tmps_ix; \
55 c->tmps_max = PL_tmps_max; \
56 c->markstack = PL_markstack; \
57 c->markstack_ptr = PL_markstack_ptr; \
58 c->markstack_max = PL_markstack_max; \
59 c->scopestack = PL_scopestack; \
60 c->scopestack_ix = PL_scopestack_ix; \
61 c->scopestack_max = PL_scopestack_max;\
62 c->savestack = PL_savestack; \
63 c->savestack_ix = PL_savestack_ix; \
64 c->savestack_max = PL_savestack_max; \
65 c->retstack = PL_retstack; \
66 c->retstack_ix = PL_retstack_ix; \
67 c->retstack_max = PL_retstack_max; \
68 c->curcop = PL_curcop; \
69 c->defav = GvAV (PL_defgv);
70
71#define LOAD(c) \
72 PL_dowarn = c->dowarn; \
73 PL_curstackinfo = c->curstackinfo; \
74 PL_curstack = c->curstack; \
75 PL_mainstack = c->mainstack; \
76 PL_stack_sp = c->stack_sp; \
77 PL_op = c->op; \
78 PL_curpad = c->curpad; \
79 PL_stack_base = c->stack_base; \
80 PL_stack_max = c->stack_max; \
81 PL_tmps_stack = c->tmps_stack; \
82 PL_tmps_floor = c->tmps_floor; \
83 PL_tmps_ix = c->tmps_ix; \
84 PL_tmps_max = c->tmps_max; \
85 PL_markstack = c->markstack; \
86 PL_markstack_ptr = c->markstack_ptr; \
87 PL_markstack_max = c->markstack_max; \
88 PL_scopestack = c->scopestack; \
89 PL_scopestack_ix = c->scopestack_ix; \
90 PL_scopestack_max = c->scopestack_max;\
91 PL_savestack = c->savestack; \
92 PL_savestack_ix = c->savestack_ix; \
93 PL_savestack_max = c->savestack_max; \
94 PL_retstack = c->retstack; \
95 PL_retstack_ix = c->retstack_ix; \
96 PL_retstack_max = c->retstack_max; \
97 PL_curcop = c->curcop; \
98 GvAV (PL_defgv) = c->defav;
99
100/* this is an EXACT copy of S_nuke_stacks in perl.c, which is unfortunately static */
101STATIC void
102S_nuke_stacks(pTHX)
103{ 186{
104 while (PL_curstackinfo->si_next) 187 AV *padlist = CvPADLIST (cv);
105 PL_curstackinfo = PL_curstackinfo->si_next; 188 AV *newpadlist, *newpad;
106 while (PL_curstackinfo) { 189
107 PERL_SI *p = PL_curstackinfo->si_prev; 190 newpadlist = newAV ();
108 /* curstackinfo->si_stack got nuked by sv_free_arenas() */ 191 AvREAL_off (newpadlist);
109 Safefree(PL_curstackinfo->si_cxstack); 192#if PERL_VERSION_ATLEAST (5,9,0)
110 Safefree(PL_curstackinfo); 193 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
111 PL_curstackinfo = p; 194#else
195 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
196#endif
197 newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
198 --AvFILLp (padlist);
199
200 av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
201 av_store (newpadlist, 1, (SV *)newpad);
202
203 return newpadlist;
204}
205
206static void
207free_padlist (AV *padlist)
208{
209 /* may be during global destruction */
210 if (SvREFCNT (padlist))
211 {
212 I32 i = AvFILLp (padlist);
213 while (i >= 0)
214 {
215 SV **svp = av_fetch (padlist, i--, FALSE);
216 if (svp)
217 {
218 SV *sv;
219 while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
220 SvREFCNT_dec (sv);
221
222 SvREFCNT_dec (*svp);
223 }
224 }
225
226 SvREFCNT_dec ((SV*)padlist);
112 } 227 }
228}
229
230static int
231coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
232{
233 AV *padlist;
234 AV *av = (AV *)mg->mg_obj;
235
236 /* casting is fun. */
237 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
238 free_padlist (padlist);
239
240 SvREFCNT_dec (av);
241
242 return 0;
243}
244
245#define PERL_MAGIC_coro PERL_MAGIC_ext
246
247static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
248
249/* the next two functions merely cache the padlists */
250static void
251get_padlist (CV *cv)
252{
253 MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
254
255 if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)
256 CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);
257 else
258 {
259#if 0
260 /* this is probably cleaner, but also slower? */
261 CV *cp = Perl_cv_clone (cv);
262 CvPADLIST (cv) = CvPADLIST (cp);
263 CvPADLIST (cp) = 0;
264 SvREFCNT_dec (cp);
265#else
266 CvPADLIST (cv) = coro_clone_padlist (cv);
267#endif
268 }
269}
270
271static void
272put_padlist (CV *cv)
273{
274 MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
275
276 if (!mg)
277 {
278 sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
279 mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
280 mg->mg_virtual = &vtbl_coro;
281 mg->mg_obj = (SV *)newAV ();
282 }
283
284 av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));
285}
286
287#define SB do {
288#define SE } while (0)
289
290#define LOAD(state) load_state((state));
291#define SAVE(state,flags) save_state((state),(flags));
292
293#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE
294
295static void
296load_state(Coro__State c)
297{
298 PL_dowarn = c->dowarn;
299 PL_in_eval = c->in_eval;
300
301 PL_curstackinfo = c->curstackinfo;
302 PL_curstack = c->curstack;
303 PL_mainstack = c->mainstack;
304 PL_stack_sp = c->stack_sp;
305 PL_op = c->op;
306 PL_curpad = c->curpad;
307 PL_comppad = c->comppad;
308 PL_compcv = c->compcv;
309 PL_stack_base = c->stack_base;
310 PL_stack_max = c->stack_max;
311 PL_tmps_stack = c->tmps_stack;
312 PL_tmps_floor = c->tmps_floor;
313 PL_tmps_ix = c->tmps_ix;
314 PL_tmps_max = c->tmps_max;
315 PL_markstack = c->markstack;
316 PL_markstack_ptr = c->markstack_ptr;
317 PL_markstack_max = c->markstack_max;
318 PL_scopestack = c->scopestack;
319 PL_scopestack_ix = c->scopestack_ix;
320 PL_scopestack_max = c->scopestack_max;
321 PL_savestack = c->savestack;
322 PL_savestack_ix = c->savestack_ix;
323 PL_savestack_max = c->savestack_max;
324#if !PERL_VERSION_ATLEAST (5,9,0)
325 PL_retstack = c->retstack;
326 PL_retstack_ix = c->retstack_ix;
327 PL_retstack_max = c->retstack_max;
328#endif
329 PL_curpm = c->curpm;
330 PL_curcop = c->curcop;
331
332 if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
333 if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
334 if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
335
336 {
337 dSP;
338 CV *cv;
339
340 /* now do the ugly restore mess */
341 while ((cv = (CV *)POPs))
342 {
343 AV *padlist = (AV *)POPs;
344
345 if (padlist)
346 {
347 put_padlist (cv); /* mark this padlist as available */
348 CvPADLIST(cv) = padlist;
349 }
350
351 ++CvDEPTH(cv);
352 }
353
354 PUTBACK;
355 }
356}
357
358static void
359save_state(Coro__State c, int flags)
360{
361 {
362 dSP;
363 I32 cxix = cxstack_ix;
364 PERL_CONTEXT *ccstk = cxstack;
365 PERL_SI *top_si = PL_curstackinfo;
366
367 /*
368 * the worst thing you can imagine happens first - we have to save
369 * (and reinitialize) all cv's in the whole callchain :(
370 */
371
372 PUSHs (Nullsv);
373 /* this loop was inspired by pp_caller */
374 for (;;)
375 {
376 while (cxix >= 0)
377 {
378 PERL_CONTEXT *cx = &ccstk[cxix--];
379
380 if (CxTYPE(cx) == CXt_SUB)
381 {
382 CV *cv = cx->blk_sub.cv;
383 if (CvDEPTH(cv))
384 {
385 EXTEND (SP, CvDEPTH(cv)*2);
386
387 while (--CvDEPTH(cv))
388 {
389 /* this tells the restore code to increment CvDEPTH */
390 PUSHs (Nullsv);
391 PUSHs ((SV *)cv);
392 }
393
394 PUSHs ((SV *)CvPADLIST(cv));
395 PUSHs ((SV *)cv);
396
397 get_padlist (cv);
398 }
399 }
400#ifdef CXt_FORMAT
401 else if (CxTYPE(cx) == CXt_FORMAT)
402 {
403 /* I never used formats, so how should I know how these are implemented? */
404 /* my bold guess is as a simple, plain sub... */
405 croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
406 }
407#endif
408 }
409
410 if (top_si->si_type == PERLSI_MAIN)
411 break;
412
413 top_si = top_si->si_prev;
414 ccstk = top_si->si_cxstack;
415 cxix = top_si->si_cxix;
416 }
417
418 PUTBACK;
419 }
420
421 c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
422 c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
423 c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
424
425 c->dowarn = PL_dowarn;
426 c->in_eval = PL_in_eval;
427
428 c->curstackinfo = PL_curstackinfo;
429 c->curstack = PL_curstack;
430 c->mainstack = PL_mainstack;
431 c->stack_sp = PL_stack_sp;
432 c->op = PL_op;
433 c->curpad = PL_curpad;
434 c->comppad = PL_comppad;
435 c->compcv = PL_compcv;
436 c->stack_base = PL_stack_base;
437 c->stack_max = PL_stack_max;
438 c->tmps_stack = PL_tmps_stack;
439 c->tmps_floor = PL_tmps_floor;
440 c->tmps_ix = PL_tmps_ix;
441 c->tmps_max = PL_tmps_max;
442 c->markstack = PL_markstack;
443 c->markstack_ptr = PL_markstack_ptr;
444 c->markstack_max = PL_markstack_max;
445 c->scopestack = PL_scopestack;
446 c->scopestack_ix = PL_scopestack_ix;
447 c->scopestack_max = PL_scopestack_max;
448 c->savestack = PL_savestack;
449 c->savestack_ix = PL_savestack_ix;
450 c->savestack_max = PL_savestack_max;
451#if !PERL_VERSION_ATLEAST (5,9,0)
452 c->retstack = PL_retstack;
453 c->retstack_ix = PL_retstack_ix;
454 c->retstack_max = PL_retstack_max;
455#endif
456 c->curpm = PL_curpm;
457 c->curcop = PL_curcop;
458}
459
460/*
461 * allocate various perl stacks. This is an exact copy
462 * of perl.c:init_stacks, except that it uses less memory
463 * on the (sometimes correct) assumption that coroutines do
464 * not usually need a lot of stackspace.
465 */
466static void
467coro_init_stacks ()
468{
469 PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
470 PL_curstackinfo->si_type = PERLSI_MAIN;
471 PL_curstack = PL_curstackinfo->si_stack;
472 PL_mainstack = PL_curstack; /* remember in case we switch stacks */
473
474 PL_stack_base = AvARRAY(PL_curstack);
475 PL_stack_sp = PL_stack_base;
476 PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
477
478 New(50,PL_tmps_stack,96,SV*);
479 PL_tmps_floor = -1;
480 PL_tmps_ix = -1;
481 PL_tmps_max = 96;
482
483 New(54,PL_markstack,16,I32);
484 PL_markstack_ptr = PL_markstack;
485 PL_markstack_max = PL_markstack + 16;
486
487#ifdef SET_MARK_OFFSET
488 SET_MARK_OFFSET;
489#endif
490
491 New(54,PL_scopestack,16,I32);
492 PL_scopestack_ix = 0;
493 PL_scopestack_max = 16;
494
495 New(54,PL_savestack,96,ANY);
496 PL_savestack_ix = 0;
497 PL_savestack_max = 96;
498
499#if !PERL_VERSION_ATLEAST (5,9,0)
500 New(54,PL_retstack,8,OP*);
501 PL_retstack_ix = 0;
502 PL_retstack_max = 8;
503#endif
504}
505
506/*
507 * destroy the stacks, the callchain etc...
508 */
509static void
510coro_destroy_stacks ()
511{
512 if (!IN_DESTRUCT)
513 {
514 /* is this ugly, I ask? */
515 LEAVE_SCOPE (0);
516
517 /* sure it is, but more important: is it correct?? :/ */
518 FREETMPS;
519
520 /*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
521 }
522
523 while (PL_curstackinfo->si_next)
524 PL_curstackinfo = PL_curstackinfo->si_next;
525
526 while (PL_curstackinfo)
527 {
528 PERL_SI *p = PL_curstackinfo->si_prev;
529
530 { /*D*//*remove*/
531 dSP;
532 SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
533 PUTBACK; /* possibly superfluous */
534 }
535
536 if (!IN_DESTRUCT)
537 {
538 dounwind (-1);/*D*//*remove*/
539 SvREFCNT_dec (PL_curstackinfo->si_stack);
540 }
541
542 Safefree (PL_curstackinfo->si_cxstack);
543 Safefree (PL_curstackinfo);
544 PL_curstackinfo = p;
545 }
546
113 Safefree(PL_tmps_stack); 547 Safefree (PL_tmps_stack);
114 Safefree(PL_markstack); 548 Safefree (PL_markstack);
115 Safefree(PL_scopestack); 549 Safefree (PL_scopestack);
116 Safefree(PL_savestack); 550 Safefree (PL_savestack);
551#if !PERL_VERSION_ATLEAST (5,9,0)
117 Safefree(PL_retstack); 552 Safefree (PL_retstack);
553#endif
118} 554}
119 555
556static void
557setup_coro (struct coro *coro)
558{
559 /*
560 * emulate part of the perl startup here.
561 */
562
563 coro_init_stacks ();
564
565 PL_curcop = 0;
566 PL_in_eval = 0;
567 PL_curpm = 0;
568
569 {
570 dSP;
571 LOGOP myop;
572
573 /* I have no idea why this is needed, but it is */
574 PUSHMARK (SP);
575
576 SvREFCNT_dec (GvAV (PL_defgv));
577 GvAV (PL_defgv) = coro->args; coro->args = 0;
578
579 Zero (&myop, 1, LOGOP);
580 myop.op_next = Nullop;
581 myop.op_flags = OPf_WANT_VOID;
582
583 PL_op = (OP *)&myop;
584
585 PUSHMARK (SP);
586 XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
587 PUTBACK;
588 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
589 SPAGAIN;
590
591 ENTER; /* necessary e.g. for dounwind */
592 }
593}
594
595static void
596free_coro_mortal ()
597{
598 if (coro_mortal)
599 {
600 SvREFCNT_dec (coro_mortal);
601 coro_mortal = 0;
602 }
603}
604
605static void NOINLINE
606prepare_cctx (coro_cctx *cctx)
607{
608 dSP;
609 LOGOP myop;
610
611 Zero (&myop, 1, LOGOP);
612 myop.op_next = PL_op;
613 myop.op_flags = OPf_WANT_VOID;
614
615 sv_setiv (get_sv ("Coro::State::_cctx", FALSE), PTR2IV (cctx));
616
617 PUSHMARK (SP);
618 XPUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
619 PUTBACK;
620 PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
621 SPAGAIN;
622}
623
624static void
625coro_run (void *arg)
626{
627 /* coro_run is the alternative epilogue of transfer() */
628 UNLOCK;
629
630 /*
631 * this is a _very_ stripped down perl interpreter ;)
632 */
633 PL_top_env = &PL_start_env;
634
635 /* inject call to cctx_init */
636 prepare_cctx ((coro_cctx *)arg);
637
638 /* somebody will hit me for both perl_run and PL_restartop */
639 perl_run (PL_curinterp);
640
641 fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
642 abort ();
643}
644
645static coro_cctx *
646cctx_new ()
647{
648 coro_cctx *cctx;
649
650 ++cctx_count;
651
652 New (0, cctx, 1, coro_cctx);
653
654#if HAVE_MMAP
655
656 cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
657 /* mmap suppsedly does allocate-on-write for us */
658 cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
659
660 if (cctx->sptr == (void *)-1)
661 {
662 perror ("FATAL: unable to mmap stack for coroutine");
663 _exit (EXIT_FAILURE);
664 }
665
666# if STACKGUARD
667 mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
668# endif
669
670#else
671
672 cctx->ssize = STACKSIZE * (long)sizeof (long);
673 New (0, cctx->sptr, STACKSIZE, long);
674
675 if (!cctx->sptr)
676 {
677 perror ("FATAL: unable to malloc stack for coroutine");
678 _exit (EXIT_FAILURE);
679 }
680
681#endif
682
683#if USE_VALGRIND
684 cctx->valgrind_id = VALGRIND_STACK_REGISTER (
685 STACKGUARD * PAGESIZE + (char *)cctx->sptr,
686 cctx->ssize + (char *)cctx->sptr
687 );
688#endif
689
690 coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
691
692 return cctx;
693}
694
695static void
696cctx_free (coro_cctx *cctx)
697{
698 if (!cctx)
699 return;
700
701 --cctx_count;
702
703#if USE_VALGRIND
704 VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
705#endif
706
707#if HAVE_MMAP
708 munmap (cctx->sptr, cctx->ssize);
709#else
710 Safefree (cctx->sptr);
711#endif
712
713 Safefree (cctx);
714}
715
716static coro_cctx *
717cctx_get ()
718{
719 coro_cctx *cctx;
720
721 if (cctx_first)
722 {
723 --cctx_idle;
724 cctx = cctx_first;
725 cctx_first = cctx->next;
726 }
727 else
728 {
729 cctx = cctx_new ();
730 PL_op = PL_op->op_next;
731 }
732
733 return cctx;
734}
735
736static void
737cctx_put (coro_cctx *cctx)
738{
739 ++cctx_idle;
740 cctx->next = cctx_first;
741 cctx_first = cctx;
742}
743
744/* never call directly, always through the coro_state_transfer global variable */
745static void NOINLINE
746transfer (struct coro *prev, struct coro *next, int flags)
747{
748 dSTACKLEVEL;
749
750 /* sometimes transfer is only called to set idle_sp */
751 if (flags == TRANSFER_SET_STACKLEVEL)
752 ((coro_cctx *)prev)->idle_sp = STACKLEVEL;
753 else if (prev != next)
754 {
755 coro_cctx *prev__cctx;
756
757 LOCK;
758
759 if (next->mainstack)
760 {
761 /* coroutine already started */
762 SAVE (prev, flags);
763 LOAD (next);
764 }
765 else
766 {
767 /* need to start coroutine */
768 /* first get rid of the old state */
769 SAVE (prev, -1);
770 /* setup coroutine call */
771 setup_coro (next);
772 /* need a stack */
773 next->cctx = 0;
774 }
775
776 if (!prev->cctx)
777 /* create a new empty context */
778 Newz (0, prev->cctx, 1, coro_cctx);
779
780 prev__cctx = prev->cctx;
781
782 /* possibly "free" the cctx */
783 if (prev__cctx->idle_sp == STACKLEVEL)
784 {
785 cctx_put (prev__cctx);
786 prev->cctx = 0;
787 }
788
789 if (!next->cctx)
790 next->cctx = cctx_get ();
791
792 if (prev__cctx != next->cctx)
793 {
794 prev__cctx->top_env = PL_top_env;
795 PL_top_env = next->cctx->top_env;
796 coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
797 }
798
799 free_coro_mortal ();
800
801 UNLOCK;
802 }
803}
804
805struct transfer_args
806{
807 struct coro *prev, *next;
808 int flags;
809};
810
811#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
812
813static void
814coro_state_destroy (struct coro *coro)
815{
816 if (coro->refcnt--)
817 return;
818
819 if (coro->mainstack && coro->mainstack != main_mainstack)
820 {
821 struct coro temp;
822
823 SAVE ((&temp), TRANSFER_SAVE_ALL);
824 LOAD (coro);
825
826 coro_destroy_stacks ();
827
828 LOAD ((&temp)); /* this will get rid of defsv etc.. */
829
830 coro->mainstack = 0;
831 }
832
833 cctx_free (coro->cctx);
834 SvREFCNT_dec (coro->args);
835 Safefree (coro);
836}
837
838static int
839coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
840{
841 struct coro *coro = (struct coro *)mg->mg_ptr;
842 mg->mg_ptr = 0;
843
844 coro_state_destroy (coro);
845
846 return 0;
847}
848
849static int
850coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
851{
852 struct coro *coro = (struct coro *)mg->mg_ptr;
853
854 ++coro->refcnt;
855
856 return 0;
857}
858
859static MGVTBL coro_state_vtbl = {
860 0, 0, 0, 0,
861 coro_state_clear,
862 0,
863#ifdef MGf_DUP
864 coro_state_dup,
865#else
866# define MGf_DUP 0
867#endif
868};
869
870static struct coro *
871SvSTATE (SV *coro)
872{
873 HV *stash;
874 MAGIC *mg;
875
876 if (SvROK (coro))
877 coro = SvRV (coro);
878
879 stash = SvSTASH (coro);
880 if (stash != coro_stash && stash != coro_state_stash)
881 {
882 /* very slow, but rare, check */
883 if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
884 croak ("Coro::State object required");
885 }
886
887 mg = SvMAGIC (coro);
888 assert (mg->mg_type == PERL_MAGIC_ext);
889 return (struct coro *)mg->mg_ptr;
890}
891
892static void
893prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
894{
895 ta->prev = SvSTATE (prev);
896 ta->next = SvSTATE (next);
897 ta->flags = flags;
898}
899
900static void
901api_transfer (SV *prev, SV *next, int flags)
902{
903 dTHX;
904 struct transfer_args ta;
905
906 prepare_transfer (&ta, prev, next, flags);
907 TRANSFER (ta);
908}
909
910/** Coro ********************************************************************/
911
912#define PRIO_MAX 3
913#define PRIO_HIGH 1
914#define PRIO_NORMAL 0
915#define PRIO_LOW -1
916#define PRIO_IDLE -3
917#define PRIO_MIN -4
918
919/* for Coro.pm */
920static GV *coro_current, *coro_idle;
921static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
922static int coro_nready;
923
924static void
925coro_enq (SV *sv)
926{
927 int prio;
928
929 if (SvTYPE (sv) != SVt_PVHV)
930 croak ("Coro::ready tried to enqueue something that is not a coroutine");
931
932 prio = SvSTATE (sv)->prio;
933
934 av_push (coro_ready [prio - PRIO_MIN], sv);
935 coro_nready++;
936}
937
938static SV *
939coro_deq (int min_prio)
940{
941 int prio = PRIO_MAX - PRIO_MIN;
942
943 min_prio -= PRIO_MIN;
944 if (min_prio < 0)
945 min_prio = 0;
946
947 for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
948 if (AvFILLp (coro_ready [prio]) >= 0)
949 {
950 coro_nready--;
951 return av_shift (coro_ready [prio]);
952 }
953
954 return 0;
955}
956
957static void
958api_ready (SV *coro)
959{
960 dTHX;
961
962 if (SvROK (coro))
963 coro = SvRV (coro);
964
965 LOCK;
966 coro_enq (SvREFCNT_inc (coro));
967 UNLOCK;
968}
969
970static void
971prepare_schedule (struct transfer_args *ta)
972{
973 SV *current, *prev, *next;
974
975 current = GvSV (coro_current);
976
977 for (;;)
978 {
979 LOCK;
980 next = coro_deq (PRIO_MIN);
981 UNLOCK;
982
983 if (next)
984 break;
985
986 {
987 dSP;
988
989 ENTER;
990 SAVETMPS;
991
992 PUSHMARK (SP);
993 PUTBACK;
994 call_sv (GvSV (coro_idle), G_DISCARD);
995
996 FREETMPS;
997 LEAVE;
998 }
999 }
1000
1001 prev = SvRV (current);
1002 SvRV (current) = next;
1003
1004 /* free this only after the transfer */
1005 LOCK;
1006 free_coro_mortal ();
1007 UNLOCK;
1008 coro_mortal = prev;
1009
1010 ta->prev = SvSTATE (prev);
1011 ta->next = SvSTATE (next);
1012 ta->flags = TRANSFER_SAVE_ALL;
1013}
1014
1015static void
1016prepare_cede (struct transfer_args *ta)
1017{
1018 LOCK;
1019 coro_enq (SvREFCNT_inc (SvRV (GvSV (coro_current))));
1020 UNLOCK;
1021
1022 prepare_schedule (ta);
1023}
1024
1025static void
1026api_schedule (void)
1027{
1028 dTHX;
1029 struct transfer_args ta;
1030
1031 prepare_schedule (&ta);
1032 TRANSFER (ta);
1033}
1034
1035static void
1036api_cede (void)
1037{
1038 dTHX;
1039 struct transfer_args ta;
1040
1041 prepare_cede (&ta);
1042 TRANSFER (ta);
1043}
1044
120MODULE = Coro::State PACKAGE = Coro::State 1045MODULE = Coro::State PACKAGE = Coro::State
121 1046
122PROTOTYPES: ENABLE 1047PROTOTYPES: DISABLE
123 1048
124Coro::State 1049BOOT:
125newprocess(proc) 1050{
126 SV * proc 1051#ifdef USE_ITHREADS
127 PROTOTYPE: & 1052 MUTEX_INIT (&coro_mutex);
1053#endif
1054 BOOT_PAGESIZE;
1055
1056 coro_state_stash = gv_stashpv ("Coro::State", TRUE);
1057
1058 newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
1059 newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
1060 newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
1061
1062 main_mainstack = PL_mainstack;
1063
1064 coroapi.ver = CORO_API_VERSION;
1065 coroapi.transfer = api_transfer;
1066
1067 assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
1068}
1069
1070SV *
1071new (char *klass, ...)
128 CODE: 1072 CODE:
129 Coro__State coro; 1073{
130 1074 struct coro *coro;
1075 HV *hv;
1076 int i;
1077
131 New (0, coro, 1, struct coro); 1078 Newz (0, coro, 1, struct coro);
1079 coro->args = newAV ();
132 1080
133 coro->mainstack = 0; /* actual work is done inside transfer */ 1081 hv = newHV ();
134 coro->proc = SvREFCNT_inc (proc); 1082 sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
1083 RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
135 1084
136 RETVAL = coro; 1085 for (i = 1; i < items; i++)
1086 av_push (coro->args, newSVsv (ST (i)));
1087}
137 OUTPUT: 1088 OUTPUT:
138 RETVAL 1089 RETVAL
139 1090
140void 1091void
141transfer(prev,next) 1092_set_stacklevel (...)
142 Coro::State_or_hashref prev 1093 ALIAS:
143 Coro::State_or_hashref next 1094 Coro::State::transfer = 1
1095 Coro::schedule = 2
1096 Coro::cede = 3
1097 Coro::Cont::yield = 4
144 CODE: 1098 CODE:
1099{
1100 struct transfer_args ta;
145 1101
146 if (prev != next) 1102 switch (ix)
147 { 1103 {
148 PUTBACK; 1104 case 0:
149 SAVE (prev); 1105 ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
1106 ta.next = 0;
1107 ta.flags = TRANSFER_SET_STACKLEVEL;
1108 break;
150 1109
151 /* 1110 case 1:
152 * this could be done in newprocess which would to 1111 if (items != 3)
153 * extremely elegant and fast (just PUTBACK/SAVE/LOAD/SPAGAIN) 1112 croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);
154 * code here, but lazy allocation of stacks has also 1113
155 * some virtues and the overhead of the if() is nil. 1114 prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
156 */ 1115 break;
157 if (next->mainstack) 1116
1117 case 2:
1118 prepare_schedule (&ta);
1119 break;
1120
1121 case 3:
1122 prepare_cede (&ta);
1123 break;
1124
1125 case 4:
158 { 1126 {
159 LOAD (next); 1127 SV *yieldstack;
160 next->mainstack = 0; /* unnecessary but much cleaner */ 1128 SV *sv;
1129 AV *defav = GvAV (PL_defgv);
1130
1131 yieldstack = *hv_fetch (
1132 (HV *)SvRV (GvSV (coro_current)),
1133 "yieldstack", sizeof ("yieldstack") - 1,
1134 0
161 SPAGAIN; 1135 );
1136
1137 /* set up @_ -- ugly */
1138 av_clear (defav);
1139 av_fill (defav, items - 1);
1140 while (items--)
1141 av_store (defav, items, SvREFCNT_inc (ST(items)));
1142
1143 sv = av_pop ((AV *)SvRV (yieldstack));
1144 ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
1145 ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
1146 ta.flags = 0;
1147 SvREFCNT_dec (sv);
162 } 1148 }
163 else 1149 break;
164 {
165 /*
166 * emulate part of the perl startup here.
167 */
168 UNOP myop;
169 1150
170 init_stacks ();
171 PL_op = (OP *)&myop;
172 /*PL_curcop = 0;*/
173 GvAV (PL_defgv) = newAV ();
174
175 SPAGAIN;
176 Zero(&myop, 1, UNOP);
177 myop.op_next = Nullop;
178 myop.op_flags = OPf_WANT_VOID;
179
180 EXTEND (SP,1);
181 PUSHs (next->proc);
182
183 PUTBACK;
184 /*
185 * the next line is slightly wrong, as PL_op->op_next
186 * is actually being executed so we skip the first op
187 * that doens't matter, though, since it is only
188 * pp_nextstate and we never return...
189 */
190 PL_op = Perl_pp_entersub(aTHX);
191 SPAGAIN;
192
193 ENTER;
194 }
195 } 1151 }
196 1152
1153 TRANSFER (ta);
1154}
1155
197void 1156void
198DESTROY(coro) 1157_clone_state_from (SV *dst, SV *src)
199 Coro::State coro 1158 CODE:
1159{
1160 struct coro *coro_src = SvSTATE (src);
1161
1162 sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
1163
1164 ++coro_src->refcnt;
1165 sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
1166}
1167
1168void
1169_exit (code)
1170 int code
1171 PROTOTYPE: $
1172 CODE:
1173 _exit (code);
1174
1175int
1176cctx_count ()
1177 CODE:
1178 RETVAL = cctx_count;
1179 OUTPUT:
1180 RETVAL
1181
1182int
1183cctx_idle ()
1184 CODE:
1185 RETVAL = cctx_idle;
1186 OUTPUT:
1187 RETVAL
1188
1189MODULE = Coro::State PACKAGE = Coro
1190
1191BOOT:
1192{
1193 int i;
1194
1195 coro_stash = gv_stashpv ("Coro", TRUE);
1196
1197 newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1198 newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1199 newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1200 newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1201 newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1202 newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1203
1204 coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1205 coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1206
1207 for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1208 coro_ready[i] = newAV ();
1209
1210 {
1211 SV *sv = perl_get_sv("Coro::API", 1);
1212
1213 coroapi.schedule = api_schedule;
1214 coroapi.cede = api_cede;
1215 coroapi.ready = api_ready;
1216 coroapi.nready = &coro_nready;
1217 coroapi.current = coro_current;
1218
1219 GCoroAPI = &coroapi;
1220 sv_setiv (sv, (IV)&coroapi);
1221 SvREADONLY_on (sv);
1222 }
1223}
1224
1225int
1226prio (Coro::State coro, int newprio = 0)
1227 ALIAS:
1228 nice = 1
200 CODE: 1229 CODE:
1230{
1231 RETVAL = coro->prio;
201 1232
202 if (coro->mainstack) 1233 if (items > 1)
203 { 1234 {
204 struct coro temp; 1235 if (ix)
1236 newprio += coro->prio;
205 1237
206 PUTBACK; 1238 if (newprio < PRIO_MIN) newprio = PRIO_MIN;
207 SAVE((&temp)); 1239 if (newprio > PRIO_MAX) newprio = PRIO_MAX;
208 LOAD(coro);
209 1240
210 S_nuke_stacks (); 1241 coro->prio = newprio;
211 SvREFCNT_dec ((SV *)GvAV (PL_defgv));
212
213 LOAD((&temp));
214 SPAGAIN;
215 } 1242 }
1243}
216 1244
217 SvREFCNT_dec (coro->proc); 1245void
218 Safefree (coro); 1246ready (SV *self)
1247 PROTOTYPE: $
1248 CODE:
1249 api_ready (self);
219 1250
1251int
1252nready (...)
1253 PROTOTYPE:
1254 CODE:
1255 RETVAL = coro_nready;
1256 OUTPUT:
1257 RETVAL
220 1258
1259MODULE = Coro::State PACKAGE = Coro::AIO
1260
1261SV *
1262_get_state ()
1263 CODE:
1264{
1265 struct {
1266 int errorno;
1267 int laststype;
1268 int laststatval;
1269 Stat_t statcache;
1270 } data;
1271
1272 data.errorno = errno;
1273 data.laststype = PL_laststype;
1274 data.laststatval = PL_laststatval;
1275 data.statcache = PL_statcache;
1276
1277 RETVAL = newSVpvn ((char *)&data, sizeof data);
1278}
1279 OUTPUT:
1280 RETVAL
1281
1282void
1283_set_state (char *data_)
1284 PROTOTYPE: $
1285 CODE:
1286{
1287 struct {
1288 int errorno;
1289 int laststype;
1290 int laststatval;
1291 Stat_t statcache;
1292 } *data = (void *)data_;
1293
1294 errno = data->errorno;
1295 PL_laststype = data->laststype;
1296 PL_laststatval = data->laststatval;
1297 PL_statcache = data->statcache;
1298}

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