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Comparing Coro/Coro/State.xs (file contents):
Revision 1.22 by root, Sat Aug 11 23:10:56 2001 UTC vs.
Revision 1.141 by root, Mon Jan 22 18:45:17 2007 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
5#include "libcoro/coro.c" 7#include "patchlevel.h"
6 8
7#include <signal.h> 9#include <stdio.h>
10#include <errno.h>
11#include <assert.h>
8 12
9#ifdef HAVE_MMAP 13#ifdef HAVE_MMAP
10# include <unistd.h> 14# include <unistd.h>
11# include <sys/mman.h> 15# include <sys/mman.h>
12# ifndef MAP_ANON
13# ifdef MAP_ANONYMOUS 16# ifndef MAP_ANONYMOUS
14# define MAP_ANON MAP_ANONYMOUS 17# ifdef MAP_ANON
18# define MAP_ANONYMOUS MAP_ANON
15# else 19# else
16# undef HAVE_MMAP 20# undef HAVE_MMAP
17# endif 21# endif
18# endif 22# endif
23# include <limits.h>
24# ifndef PAGESIZE
25# define PAGESIZE pagesize
26# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
27static long pagesize;
28# else
29# define BOOT_PAGESIZE (void)0
19#endif 30# endif
20
21#define MAY_FLUSH /* increases codesize */
22
23/* perl-related */
24#define TRANSFER_SAVE_DEFAV 0x00000001
25#define TRANSFER_SAVE_DEFSV 0x00000002
26#define TRANSFER_SAVE_ERRSV 0x00000004
27/* c-related */
28#define TRANSFER_SAVE_CCTXT 0x00000008
29#ifdef CORO_LAZY_STACK
30# define TRANSFER_LAZY_STACK 0x00000010
31#else 31#else
32# define TRANSFER_LAZY_STACK 0x00000000 32# define PAGESIZE 0
33# define BOOT_PAGESIZE (void)0
34#endif
35
36#if USE_VALGRIND
37# include <valgrind/valgrind.h>
38# define REGISTER_STACK(cctx,start,end) (cctx)->valgrind_id = VALGRIND_STACK_REGISTER ((start), (end))
39#else
40# define REGISTER_STACK(cctx,start,end)
41#endif
42
43/* the maximum number of idle cctx that will be pooled */
44#define MAX_IDLE_CCTX 8
45
46#define PERL_VERSION_ATLEAST(a,b,c) \
47 (PERL_REVISION > (a) \
48 || (PERL_REVISION == (a) \
49 && (PERL_VERSION > (b) \
50 || (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
51
52#if !PERL_VERSION_ATLEAST (5,6,0)
53# ifndef PL_ppaddr
54# define PL_ppaddr ppaddr
33#endif 55# endif
56# ifndef call_sv
57# define call_sv perl_call_sv
58# endif
59# ifndef get_sv
60# define get_sv perl_get_sv
61# endif
62# ifndef get_cv
63# define get_cv perl_get_cv
64# endif
65# ifndef IS_PADGV
66# define IS_PADGV(v) 0
67# endif
68# ifndef IS_PADCONST
69# define IS_PADCONST(v) 0
70# endif
71#endif
34 72
35#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \ 73/* 5.8.7 */
36 |TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT) 74#ifndef SvRV_set
75# define SvRV_set(s,v) SvRV(s) = (v)
76#endif
37 77
38#define SUB_INIT "Coro::State::initialize" 78#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
39#define UCORO_STATE "_coro_state" 79# undef STACKGUARD
80#endif
40 81
82#ifndef STACKGUARD
83# define STACKGUARD 0
84#endif
85
86/* prefer perl internal functions over our own? */
87#ifndef PREFER_PERL_FUNCTIONS
88# define PREFER_PERL_FUNCTIONS 0
89#endif
90
41/* The next macro should delcare a variable stacklevel that contains and approximation 91/* The next macro should declare a variable stacklevel that contains and approximation
42 * to the current C stack pointer. It's property is that it changes with each call 92 * to the current C stack pointer. Its property is that it changes with each call
43 * and should be unique. */ 93 * and should be unique. */
94#define dSTACKLEVEL int stacklevel
44#define dSTACKLEVEL void *stacklevel = &stacklevel 95#define STACKLEVEL ((void *)&stacklevel)
45 96
46#define labs(l) ((l) >= 0 ? (l) : -(l)) 97#define IN_DESTRUCT (PL_main_cv == Nullcv)
47 98
48/* this is actually not only the c stack but also c registers etc... */ 99#if __GNUC__ >= 3
100# define attribute(x) __attribute__(x)
101# define BARRIER __asm__ __volatile__ ("" : : : "memory")
102#else
103# define attribute(x)
104# define BARRIER
105#endif
106
107#define NOINLINE attribute ((noinline))
108
109#include "CoroAPI.h"
110
111#ifdef USE_ITHREADS
112static perl_mutex coro_mutex;
113# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
114# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
115#else
116# define LOCK (void)0
117# define UNLOCK (void)0
118#endif
119
120/* helper storage struct for Coro::AIO */
121struct io_state
122{
123 int errorno;
124 I32 laststype;
125 int laststatval;
126 Stat_t statcache;
127};
128
129static struct CoroAPI coroapi;
130static AV *main_mainstack; /* used to differentiate between $main and others */
131static HV *coro_state_stash, *coro_stash;
132static SV *coro_mortal; /* will be freed after next transfer */
133
134static struct coro_cctx *cctx_first;
135static int cctx_count, cctx_idle;
136
137/* this is a structure representing a c-level coroutine */
49typedef struct { 138typedef struct coro_cctx {
50 int refcnt; /* pointer reference counter */ 139 struct coro_cctx *next;
51 int usecnt; /* shared by how many coroutines */
52 int gencnt; /* generation counter */
53 140
141 /* the stack */
142 void *sptr;
143 ssize_t ssize; /* positive == mmap, otherwise malloc */
144
145 /* cpu state */
146 void *idle_sp; /* sp of top-level transfer/schedule/cede call */
147 JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
148 JMPENV *top_env;
54 coro_context cctx; 149 coro_context cctx;
55 150
56 void *sptr; 151 int inuse;
57 long ssize; /* positive == mmap, otherwise malloc */
58} coro_stack;
59 152
153#if USE_VALGRIND
154 int valgrind_id;
155#endif
156} coro_cctx;
157
158enum {
159 CF_RUNNING = 0x0001, /* coroutine is running */
160 CF_READY = 0x0002, /* coroutine is ready */
161 CF_NEW = 0x0004, /* has never been switched to */
162 CF_DESTROYED = 0x0008, /* coroutine data has been freed */
163};
164
165/* this is a structure representing a perl-level coroutine */
60struct coro { 166struct coro {
61 /* the optional C context */ 167 /* the c coroutine allocated to this perl coroutine, if any */
62 coro_stack *stack; 168 coro_cctx *cctx;
63 void *cursp;
64 int gencnt;
65
66 /* optionally saved, might be zero */
67 AV *defav;
68 SV *defsv;
69 SV *errsv;
70
71 /* saved global state not related to stacks */
72 U8 dowarn;
73 I32 in_eval;
74
75 /* the stacks and related info (callchain etc..) */
76 PERL_SI *curstackinfo;
77 AV *curstack;
78 AV *mainstack;
79 SV **stack_sp;
80 OP *op;
81 SV **curpad;
82 SV **stack_base;
83 SV **stack_max;
84 SV **tmps_stack;
85 I32 tmps_floor;
86 I32 tmps_ix;
87 I32 tmps_max;
88 I32 *markstack;
89 I32 *markstack_ptr;
90 I32 *markstack_max;
91 I32 *scopestack;
92 I32 scopestack_ix;
93 I32 scopestack_max;
94 ANY *savestack;
95 I32 savestack_ix;
96 I32 savestack_max;
97 OP **retstack;
98 I32 retstack_ix;
99 I32 retstack_max;
100 COP *curcop;
101 JMPENV *top_env;
102 169
103 /* data associated with this coroutine (initial args) */ 170 /* data associated with this coroutine (initial args) */
104 AV *args; 171 AV *args;
172 int refcnt;
173 int save; /* CORO_SAVE flags */
174 int flags; /* CF_ flags */
175
176 /* optionally saved, might be zero */
177 AV *defav; /* @_ */
178 SV *defsv; /* $_ */
179 SV *errsv; /* $@ */
180 SV *irssv; /* $/ */
181 SV *irssv_sv; /* real $/ cache */
182
183#define VAR(name,type) type name;
184# include "state.h"
185#undef VAR
186
187 /* coro process data */
188 int prio;
105}; 189};
106 190
107typedef struct coro *Coro__State; 191typedef struct coro *Coro__State;
108typedef struct coro *Coro__State_or_hashref; 192typedef struct coro *Coro__State_or_hashref;
109
110static AV *main_mainstack; /* used to differentiate between $main and others */
111static HV *coro_state_stash;
112static SV *ucoro_state_sv;
113static U32 ucoro_state_hash;
114static HV *padlist_cache;
115
116/* mostly copied from op.c:cv_clone2 */
117STATIC AV *
118clone_padlist (AV *protopadlist)
119{
120 AV *av;
121 I32 ix;
122 AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
123 AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
124 SV **pname = AvARRAY (protopad_name);
125 SV **ppad = AvARRAY (protopad);
126 I32 fname = AvFILLp (protopad_name);
127 I32 fpad = AvFILLp (protopad);
128 AV *newpadlist, *newpad_name, *newpad;
129 SV **npad;
130
131 newpad_name = newAV ();
132 for (ix = fname; ix >= 0; ix--)
133 av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
134
135 newpad = newAV ();
136 av_fill (newpad, AvFILLp (protopad));
137 npad = AvARRAY (newpad);
138
139 newpadlist = newAV ();
140 AvREAL_off (newpadlist);
141 av_store (newpadlist, 0, (SV *) newpad_name);
142 av_store (newpadlist, 1, (SV *) newpad);
143
144 av = newAV (); /* will be @_ */
145 av_extend (av, 0);
146 av_store (newpad, 0, (SV *) av);
147 AvFLAGS (av) = AVf_REIFY;
148
149 for (ix = fpad; ix > 0; ix--)
150 {
151 SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;
152 if (namesv && namesv != &PL_sv_undef)
153 {
154 char *name = SvPVX (namesv); /* XXX */
155 if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')
156 { /* lexical from outside? */
157 npad[ix] = SvREFCNT_inc (ppad[ix]);
158 }
159 else
160 { /* our own lexical */
161 SV *sv;
162 if (*name == '&')
163 sv = SvREFCNT_inc (ppad[ix]);
164 else if (*name == '@')
165 sv = (SV *) newAV ();
166 else if (*name == '%')
167 sv = (SV *) newHV ();
168 else
169 sv = NEWSV (0, 0);
170 if (!SvPADBUSY (sv))
171 SvPADMY_on (sv);
172 npad[ix] = sv;
173 }
174 }
175 else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
176 {
177 npad[ix] = SvREFCNT_inc (ppad[ix]);
178 }
179 else
180 {
181 SV *sv = NEWSV (0, 0);
182 SvPADTMP_on (sv);
183 npad[ix] = sv;
184 }
185 }
186
187#if 0 /* return -ENOTUNDERSTOOD */
188 /* Now that vars are all in place, clone nested closures. */
189
190 for (ix = fpad; ix > 0; ix--) {
191 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
192 if (namesv
193 && namesv != &PL_sv_undef
194 && !(SvFLAGS(namesv) & SVf_FAKE)
195 && *SvPVX(namesv) == '&'
196 && CvCLONE(ppad[ix]))
197 {
198 CV *kid = cv_clone((CV*)ppad[ix]);
199 SvREFCNT_dec(ppad[ix]);
200 CvCLONE_on(kid);
201 SvPADMY_on(kid);
202 npad[ix] = (SV*)kid;
203 }
204 }
205#endif
206
207 return newpadlist;
208}
209
210#ifdef MAY_FLUSH
211STATIC AV *
212free_padlist (AV *padlist)
213{
214 /* may be during global destruction */
215 if (SvREFCNT(padlist))
216 {
217 I32 i = AvFILLp(padlist);
218 while (i >= 0)
219 {
220 SV **svp = av_fetch(padlist, i--, FALSE);
221 SV *sv = svp ? *svp : Nullsv;
222 if (sv)
223 SvREFCNT_dec(sv);
224 }
225
226 SvREFCNT_dec((SV*)padlist);
227 }
228}
229#endif
230
231/* the next two functions merely cache the padlists */
232STATIC void
233get_padlist (CV *cv)
234{
235 SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
236
237 if (he && AvFILLp ((AV *)*he) >= 0)
238 CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
239 else
240 CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
241}
242
243STATIC void
244put_padlist (CV *cv)
245{
246 SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
247
248 if (SvTYPE (*he) != SVt_PVAV)
249 {
250 SvREFCNT_dec (*he);
251 *he = (SV *)newAV ();
252 }
253
254 av_push ((AV *)*he, (SV *)CvPADLIST (cv));
255}
256
257#ifdef MAY_FLUSH
258STATIC void
259flush_padlist_cache ()
260{
261 HV *hv = padlist_cache;
262 padlist_cache = newHV ();
263
264 if (hv_iterinit (hv))
265 {
266 HE *he;
267 AV *padlist;
268
269 while (!!(he = hv_iternext (hv)))
270 {
271 AV *av = (AV *)HeVAL(he);
272
273 /* casting is fun. */
274 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
275 free_padlist (padlist);
276 }
277 }
278
279 SvREFCNT_dec (hv);
280}
281#endif
282
283#define SB do {
284#define SE } while (0)
285
286#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE
287#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
288
289#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE
290
291static void
292load_state(pTHX_ Coro__State c)
293{
294 PL_dowarn = c->dowarn;
295 PL_in_eval = c->in_eval;
296
297 PL_curstackinfo = c->curstackinfo;
298 PL_curstack = c->curstack;
299 PL_mainstack = c->mainstack;
300 PL_stack_sp = c->stack_sp;
301 PL_op = c->op;
302 PL_curpad = c->curpad;
303 PL_stack_base = c->stack_base;
304 PL_stack_max = c->stack_max;
305 PL_tmps_stack = c->tmps_stack;
306 PL_tmps_floor = c->tmps_floor;
307 PL_tmps_ix = c->tmps_ix;
308 PL_tmps_max = c->tmps_max;
309 PL_markstack = c->markstack;
310 PL_markstack_ptr = c->markstack_ptr;
311 PL_markstack_max = c->markstack_max;
312 PL_scopestack = c->scopestack;
313 PL_scopestack_ix = c->scopestack_ix;
314 PL_scopestack_max = c->scopestack_max;
315 PL_savestack = c->savestack;
316 PL_savestack_ix = c->savestack_ix;
317 PL_savestack_max = c->savestack_max;
318 PL_retstack = c->retstack;
319 PL_retstack_ix = c->retstack_ix;
320 PL_retstack_max = c->retstack_max;
321 PL_curcop = c->curcop;
322 PL_top_env = c->top_env;
323
324 if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
325 if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
326 if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
327
328 {
329 dSP;
330 CV *cv;
331
332 /* now do the ugly restore mess */
333 while ((cv = (CV *)POPs))
334 {
335 AV *padlist = (AV *)POPs;
336
337 if (padlist)
338 {
339 put_padlist (cv); /* mark this padlist as available */
340 CvPADLIST(cv) = padlist;
341#ifdef USE_THREADS
342 /*CvOWNER(cv) = (struct perl_thread *)POPs;*/
343#endif
344 }
345
346 ++CvDEPTH(cv);
347 }
348
349 PUTBACK;
350 }
351}
352
353static void
354save_state(pTHX_ Coro__State c, int flags)
355{
356 {
357 dSP;
358 I32 cxix = cxstack_ix;
359 PERL_CONTEXT *ccstk = cxstack;
360 PERL_SI *top_si = PL_curstackinfo;
361
362 /*
363 * the worst thing you can imagine happens first - we have to save
364 * (and reinitialize) all cv's in the whole callchain :(
365 */
366
367 PUSHs (Nullsv);
368 /* this loop was inspired by pp_caller */
369 for (;;)
370 {
371 do
372 {
373 PERL_CONTEXT *cx = &ccstk[cxix--];
374
375 if (CxTYPE(cx) == CXt_SUB)
376 {
377 CV *cv = cx->blk_sub.cv;
378 if (CvDEPTH(cv))
379 {
380#ifdef USE_THREADS
381 /*XPUSHs ((SV *)CvOWNER(cv));*/
382 /*CvOWNER(cv) = 0;*/
383 /*error must unlock this cv etc.. etc...*/
384#endif
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); /* this is a monster */
398 }
399 }
400 else if (CxTYPE(cx) == CXt_FORMAT)
401 {
402 /* I never used formats, so how should I know how these are implemented? */
403 /* my bold guess is as a simple, plain sub... */
404 croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
405 }
406 }
407 while (cxix >= 0);
408
409 if (top_si->si_type == PERLSI_MAIN)
410 break;
411
412 top_si = top_si->si_prev;
413 ccstk = top_si->si_cxstack;
414 cxix = top_si->si_cxix;
415 }
416
417 PUTBACK;
418 }
419
420 c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
421 c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
422 c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
423
424 /* I have not the slightest idea of why av_reify is necessary */
425 /* but if it's missing the defav contents magically get replaced sometimes */
426 if (c->defav)
427 av_reify (c->defav);
428
429 c->dowarn = PL_dowarn;
430 c->in_eval = PL_in_eval;
431
432 c->curstackinfo = PL_curstackinfo;
433 c->curstack = PL_curstack;
434 c->mainstack = PL_mainstack;
435 c->stack_sp = PL_stack_sp;
436 c->op = PL_op;
437 c->curpad = PL_curpad;
438 c->stack_base = PL_stack_base;
439 c->stack_max = PL_stack_max;
440 c->tmps_stack = PL_tmps_stack;
441 c->tmps_floor = PL_tmps_floor;
442 c->tmps_ix = PL_tmps_ix;
443 c->tmps_max = PL_tmps_max;
444 c->markstack = PL_markstack;
445 c->markstack_ptr = PL_markstack_ptr;
446 c->markstack_max = PL_markstack_max;
447 c->scopestack = PL_scopestack;
448 c->scopestack_ix = PL_scopestack_ix;
449 c->scopestack_max = PL_scopestack_max;
450 c->savestack = PL_savestack;
451 c->savestack_ix = PL_savestack_ix;
452 c->savestack_max = PL_savestack_max;
453 c->retstack = PL_retstack;
454 c->retstack_ix = PL_retstack_ix;
455 c->retstack_max = PL_retstack_max;
456 c->curcop = PL_curcop;
457 c->top_env = PL_top_env;
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 assumption that coroutines do not usually need
464 * a lot of stackspace.
465 */
466STATIC void
467coro_init_stacks (pTHX)
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 SET_MARK_OFFSET;
488
489 New(54,PL_scopestack,16,I32);
490 PL_scopestack_ix = 0;
491 PL_scopestack_max = 16;
492
493 New(54,PL_savestack,96,ANY);
494 PL_savestack_ix = 0;
495 PL_savestack_max = 96;
496
497 New(54,PL_retstack,8,OP*);
498 PL_retstack_ix = 0;
499 PL_retstack_max = 8;
500}
501
502/*
503 * destroy the stacks, the callchain etc...
504 * still there is a memleak of 128 bytes...
505 */
506STATIC void
507destroy_stacks(pTHX)
508{
509 /* is this ugly, I ask? */
510 while (PL_scopestack_ix)
511 LEAVE;
512
513 /* sure it is, but more important: is it correct?? :/ */
514 while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
515 FREETMPS;
516
517 while (PL_curstackinfo->si_next)
518 PL_curstackinfo = PL_curstackinfo->si_next;
519
520 while (PL_curstackinfo)
521 {
522 PERL_SI *p = PL_curstackinfo->si_prev;
523
524 {
525 dSP;
526 SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
527 PUTBACK; /* possibly superfluous */
528 }
529
530 dounwind(-1);
531
532 SvREFCNT_dec(PL_curstackinfo->si_stack);
533 Safefree(PL_curstackinfo->si_cxstack);
534 Safefree(PL_curstackinfo);
535 PL_curstackinfo = p;
536 }
537
538 Safefree(PL_tmps_stack);
539 Safefree(PL_markstack);
540 Safefree(PL_scopestack);
541 Safefree(PL_savestack);
542 Safefree(PL_retstack);
543}
544
545static void
546allocate_stack (Coro__State ctx, int alloc)
547{
548 coro_stack *stack;
549
550 New (0, stack, 1, coro_stack);
551
552 stack->refcnt = 1;
553 stack->usecnt = 1;
554 stack->gencnt = ctx->gencnt = 0;
555 if (alloc)
556 {
557#ifdef HAVE_MMAP
558 stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
559 stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
560 if (stack->sptr == (void *)-1)
561#endif
562 {
563 /*FIXME*//*D*//* reasonable stack size! */
564 stack->ssize = -4096 * sizeof (long);
565 New (0, stack->sptr, 4096, long);
566 }
567 }
568 else
569 stack->sptr = 0;
570
571 ctx->stack = stack;
572}
573
574static void
575deallocate_stack (Coro__State ctx)
576{
577 coro_stack *stack = ctx->stack;
578
579 ctx->stack = 0;
580
581 if (stack)
582 {
583 if (!--stack->refcnt)
584 {
585#ifdef HAVE_MMAP
586 if (stack->ssize > 0 && stack->sptr)
587 munmap (stack->sptr, stack->ssize);
588 else
589#else
590 Safefree (stack->sptr);
591#endif
592 Safefree (stack);
593 }
594 else if (ctx->gencnt == stack->gencnt)
595 --stack->usecnt;
596 }
597}
598
599static void
600setup_coro (void *arg)
601{
602 /*
603 * emulate part of the perl startup here.
604 */
605 dSP;
606 Coro__State ctx = (Coro__State)arg;
607 SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
608
609 coro_init_stacks (aTHX);
610 /*PL_curcop = 0;*/
611 /*PL_in_eval = PL_in_eval;*/ /* inherit */
612 SvREFCNT_dec (GvAV (PL_defgv));
613 GvAV (PL_defgv) = ctx->args;
614
615 SPAGAIN;
616
617 if (ctx->stack)
618 {
619 ctx->cursp = 0;
620
621 PUSHMARK(SP);
622 PUTBACK;
623 (void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
624
625 if (SvTRUE (ERRSV))
626 croak (NULL);
627 else
628 croak ("FATAL: CCTXT coroutine returned!");
629 }
630 else
631 {
632 UNOP myop;
633
634 PL_op = (OP *)&myop;
635
636 Zero(&myop, 1, UNOP);
637 myop.op_next = Nullop;
638 myop.op_flags = OPf_WANT_VOID;
639
640 PUSHMARK(SP);
641 XPUSHs (sub_init);
642 /*
643 * the next line is slightly wrong, as PL_op->op_next
644 * is actually being executed so we skip the first op.
645 * that doesn't matter, though, since it is only
646 * pp_nextstate and we never return...
647 * ah yes, and I don't care anyways ;)
648 */
649 PUTBACK;
650 PL_op = pp_entersub();
651 SPAGAIN;
652
653 ENTER; /* necessary e.g. for dounwind */
654 }
655}
656
657static void
658continue_coro (void *arg)
659{
660 /*
661 * this is a _very_ stripped down perl interpreter ;)
662 */
663 Coro__State ctx = (Coro__State)arg;
664
665 /*FIXME*//* must set up top_env here */
666 ctx->cursp = 0;
667 PL_op = PL_op->op_next;
668 CALLRUNOPS(aTHX);
669
670 abort ();
671}
672
673STATIC void
674transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
675{
676 dSP;
677 dSTACKLEVEL;
678
679 if (prev != next)
680 {
681 if (next->mainstack)
682 {
683 SAVE (prev, flags);
684 LOAD (next);
685
686 /* mark this state as in-use */
687 next->mainstack = 0;
688 next->tmps_ix = -2;
689
690 /* stacklevel changed? if yes, grab the stack for us! */
691 if (flags & TRANSFER_SAVE_CCTXT)
692 {
693 if (!prev->stack)
694 allocate_stack (prev, 0);
695 else if (prev->cursp != stacklevel
696 && prev->stack->usecnt > 1)
697 {
698 prev->gencnt = ++prev->stack->gencnt;
699 prev->stack->usecnt = 1;
700 }
701
702 /* has our stack been invalidated? */
703 if (next->stack && next->stack->gencnt != next->gencnt)
704 {
705 deallocate_stack (next);
706 allocate_stack (next, 1);
707 coro_create (&(next->stack->cctx),
708 continue_coro, (void *)next,
709 next->stack->sptr, labs (next->stack->ssize));
710 }
711
712 coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
713 }
714
715 }
716 else if (next->tmps_ix == -2)
717 croak ("tried to transfer to running coroutine");
718 else
719 {
720 SAVE (prev, -1); /* first get rid of the old state */
721
722 if (flags & TRANSFER_SAVE_CCTXT)
723 {
724 if (!prev->stack)
725 allocate_stack (prev, 0);
726
727 if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
728 {
729 setup_coro (next);
730
731 prev->stack->refcnt++;
732 prev->stack->usecnt++;
733 next->stack = prev->stack;
734 next->gencnt = prev->gencnt;
735 }
736 else
737 {
738 allocate_stack (next, 1);
739 coro_create (&(next->stack->cctx),
740 setup_coro, (void *)next,
741 next->stack->sptr, labs (next->stack->ssize));
742 coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
743 }
744 }
745 else
746 setup_coro (next);
747 }
748 }
749
750 next->cursp = stacklevel;
751}
752
753static struct coro *
754sv_to_coro (SV *arg, const char *funcname, const char *varname)
755{
756 if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVHV)
757 {
758 HE *he = hv_fetch_ent((HV *)SvRV(arg), ucoro_state_sv, 0, ucoro_state_hash);
759
760 if (!he)
761 croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", funcname, varname);
762
763 arg = HeVAL(he);
764 }
765
766 /* must also be changed inside Coro::Cont::yield */
767 if (SvROK(arg) && SvSTASH(SvRV(arg)) == coro_state_stash)
768 return (struct coro *) SvIV((SV*)SvRV(arg));
769 else
770 croak ("%s() -- %s is not (and contains not) a Coro::State object", funcname, varname);
771}
772 193
773/** Coro ********************************************************************/ 194/** Coro ********************************************************************/
774 195
775#define PRIO_MAX 3 196#define PRIO_MAX 3
776#define PRIO_HIGH 1 197#define PRIO_HIGH 1
… …
778#define PRIO_LOW -1 199#define PRIO_LOW -1
779#define PRIO_IDLE -3 200#define PRIO_IDLE -3
780#define PRIO_MIN -4 201#define PRIO_MIN -4
781 202
782/* for Coro.pm */ 203/* for Coro.pm */
783static GV *coro_current, *coro_idle; 204static SV *coro_current;
784static AV *coro_ready[PRIO_MAX-PRIO_MIN+1]; 205static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
206static int coro_nready;
785 207
786static void 208/** lowlevel stuff **********************************************************/
787coro_enq (SV *sv) 209
210static AV *
211coro_clone_padlist (CV *cv)
788{ 212{
789 if (SvROK (sv)) 213 AV *padlist = CvPADLIST (cv);
214 AV *newpadlist, *newpad;
215
216 newpadlist = newAV ();
217 AvREAL_off (newpadlist);
218#if PERL_VERSION_ATLEAST (5,9,0)
219 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
220#else
221 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
222#endif
223 newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
224 --AvFILLp (padlist);
225
226 av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
227 av_store (newpadlist, 1, (SV *)newpad);
228
229 return newpadlist;
230}
231
232static void
233free_padlist (AV *padlist)
234{
235 /* may be during global destruction */
236 if (SvREFCNT (padlist))
790 { 237 {
791 SV *hv = SvRV (sv); 238 I32 i = AvFILLp (padlist);
792 if (SvTYPE (hv) == SVt_PVHV) 239 while (i >= 0)
793 { 240 {
794 SV **xprio = hv_fetch ((HV *)hv, "prio", 4, 0); 241 SV **svp = av_fetch (padlist, i--, FALSE);
795 int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL; 242 if (svp)
243 {
244 SV *sv;
245 while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
246 SvREFCNT_dec (sv);
796 247
797 prio = prio > PRIO_MAX ? PRIO_MAX 248 SvREFCNT_dec (*svp);
798 : prio < PRIO_MIN ? PRIO_MIN 249 }
799 : prio;
800
801 av_push (coro_ready [prio - PRIO_MIN], sv);
802
803 return;
804 } 250 }
251
252 SvREFCNT_dec ((SV*)padlist);
253 }
254}
255
256static int
257coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
258{
259 AV *padlist;
260 AV *av = (AV *)mg->mg_obj;
261
262 /* casting is fun. */
263 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
264 free_padlist (padlist);
265
266 SvREFCNT_dec (av);
267
268 return 0;
269}
270
271#define PERL_MAGIC_coro PERL_MAGIC_ext
272
273static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
274
275#define CORO_MAGIC(cv) \
276 SvMAGIC (cv) \
277 ? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
278 ? SvMAGIC (cv) \
279 : mg_find ((SV *)cv, PERL_MAGIC_coro) \
280 : 0
281
282/* the next two functions merely cache the padlists */
283static void
284get_padlist (CV *cv)
285{
286 MAGIC *mg = CORO_MAGIC (cv);
287 AV *av;
288
289 if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
290 CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
291 else
292 {
293#if PREFER_PERL_FUNCTIONS
294 /* this is probably cleaner, but also slower? */
295 CV *cp = Perl_cv_clone (cv);
296 CvPADLIST (cv) = CvPADLIST (cp);
297 CvPADLIST (cp) = 0;
298 SvREFCNT_dec (cp);
299#else
300 CvPADLIST (cv) = coro_clone_padlist (cv);
301#endif
805 } 302 }
303}
806 304
807 croak ("Coro::ready tried to enqueue something that is not a coroutine"); 305static void
306put_padlist (CV *cv)
307{
308 MAGIC *mg = CORO_MAGIC (cv);
309 AV *av;
310
311 if (!mg)
312 {
313 sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
314 mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
315 mg->mg_virtual = &vtbl_coro;
316 mg->mg_obj = (SV *)newAV ();
317 }
318
319 av = (AV *)mg->mg_obj;
320
321 if (AvFILLp (av) >= AvMAX (av))
322 av_extend (av, AvMAX (av) + 1);
323
324 AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
325}
326
327/** load & save, init *******************************************************/
328
329#define SB do {
330#define SE } while (0)
331
332#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
333
334static void
335load_perl (Coro__State c)
336{
337#define VAR(name,type) PL_ ## name = c->name;
338# include "state.h"
339#undef VAR
340
341 if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
342 if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
343 if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
344 if (c->irssv)
345 {
346 if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
347 SvREFCNT_dec (c->irssv);
348 else
349 {
350 REPLACE_SV (PL_rs, c->irssv);
351 if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
352 sv_setsv (c->irssv_sv, PL_rs);
353 }
354 }
355
356 {
357 dSP;
358 CV *cv;
359
360 /* now do the ugly restore mess */
361 while ((cv = (CV *)POPs))
362 {
363 put_padlist (cv); /* mark this padlist as available */
364 CvDEPTH (cv) = PTR2IV (POPs);
365 CvPADLIST (cv) = (AV *)POPs;
366 }
367
368 PUTBACK;
369 }
370}
371
372static void
373save_perl (Coro__State c)
374{
375 {
376 dSP;
377 I32 cxix = cxstack_ix;
378 PERL_CONTEXT *ccstk = cxstack;
379 PERL_SI *top_si = PL_curstackinfo;
380
381 /*
382 * the worst thing you can imagine happens first - we have to save
383 * (and reinitialize) all cv's in the whole callchain :(
384 */
385
386 EXTEND (SP, 3 + 1);
387 PUSHs (Nullsv);
388 /* this loop was inspired by pp_caller */
389 for (;;)
390 {
391 while (cxix >= 0)
392 {
393 PERL_CONTEXT *cx = &ccstk[cxix--];
394
395 if (CxTYPE (cx) == CXt_SUB)
396 {
397 CV *cv = cx->blk_sub.cv;
398
399 if (CvDEPTH (cv))
400 {
401 EXTEND (SP, 3);
402 PUSHs ((SV *)CvPADLIST (cv));
403 PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
404 PUSHs ((SV *)cv);
405
406 CvDEPTH (cv) = 0;
407 get_padlist (cv);
408 }
409 }
410 }
411
412 if (top_si->si_type == PERLSI_MAIN)
413 break;
414
415 top_si = top_si->si_prev;
416 ccstk = top_si->si_cxstack;
417 cxix = top_si->si_cxix;
418 }
419
420 PUTBACK;
421 }
422
423 c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
424 c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
425 c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
426 c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
427
428#define VAR(name,type)c->name = PL_ ## name;
429# include "state.h"
430#undef VAR
431}
432
433/*
434 * allocate various perl stacks. This is an exact copy
435 * of perl.c:init_stacks, except that it uses less memory
436 * on the (sometimes correct) assumption that coroutines do
437 * not usually need a lot of stackspace.
438 */
439#if PREFER_PERL_FUNCTIONS
440# define coro_init_stacks init_stacks
441#else
442static void
443coro_init_stacks ()
444{
445 PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
446 PL_curstackinfo->si_type = PERLSI_MAIN;
447 PL_curstack = PL_curstackinfo->si_stack;
448 PL_mainstack = PL_curstack; /* remember in case we switch stacks */
449
450 PL_stack_base = AvARRAY(PL_curstack);
451 PL_stack_sp = PL_stack_base;
452 PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
453
454 New(50,PL_tmps_stack,128,SV*);
455 PL_tmps_floor = -1;
456 PL_tmps_ix = -1;
457 PL_tmps_max = 128;
458
459 New(54,PL_markstack,32,I32);
460 PL_markstack_ptr = PL_markstack;
461 PL_markstack_max = PL_markstack + 32;
462
463#ifdef SET_MARK_OFFSET
464 SET_MARK_OFFSET;
465#endif
466
467 New(54,PL_scopestack,32,I32);
468 PL_scopestack_ix = 0;
469 PL_scopestack_max = 32;
470
471 New(54,PL_savestack,64,ANY);
472 PL_savestack_ix = 0;
473 PL_savestack_max = 64;
474
475#if !PERL_VERSION_ATLEAST (5,9,0)
476 New(54,PL_retstack,16,OP*);
477 PL_retstack_ix = 0;
478 PL_retstack_max = 16;
479#endif
480}
481#endif
482
483/*
484 * destroy the stacks, the callchain etc...
485 */
486static void
487coro_destroy_stacks ()
488{
489 if (!IN_DESTRUCT)
490 {
491 /* restore all saved variables and stuff */
492 LEAVE_SCOPE (0);
493 assert (PL_tmps_floor == -1);
494
495 /* free all temporaries */
496 FREETMPS;
497 assert (PL_tmps_ix == -1);
498
499 /* unwind all extra stacks */
500 POPSTACK_TO (PL_mainstack);
501
502 /* unwind main stack */
503 dounwind (-1);
504 }
505
506 while (PL_curstackinfo->si_next)
507 PL_curstackinfo = PL_curstackinfo->si_next;
508
509 while (PL_curstackinfo)
510 {
511 PERL_SI *p = PL_curstackinfo->si_prev;
512
513 if (!IN_DESTRUCT)
514 SvREFCNT_dec (PL_curstackinfo->si_stack);
515
516 Safefree (PL_curstackinfo->si_cxstack);
517 Safefree (PL_curstackinfo);
518 PL_curstackinfo = p;
519 }
520
521 Safefree (PL_tmps_stack);
522 Safefree (PL_markstack);
523 Safefree (PL_scopestack);
524 Safefree (PL_savestack);
525#if !PERL_VERSION_ATLEAST (5,9,0)
526 Safefree (PL_retstack);
527#endif
528}
529
530/** coroutine stack handling ************************************************/
531
532static void
533setup_coro (struct coro *coro)
534{
535 /*
536 * emulate part of the perl startup here.
537 */
538
539 coro_init_stacks ();
540
541 PL_curcop = &PL_compiling;
542 PL_in_eval = EVAL_NULL;
543 PL_curpm = 0;
544 PL_localizing = 0;
545 PL_dirty = 0;
546 PL_restartop = 0;
547
548 {
549 dSP;
550 LOGOP myop;
551
552 SvREFCNT_dec (GvAV (PL_defgv));
553 GvAV (PL_defgv) = coro->args; coro->args = 0;
554
555 Zero (&myop, 1, LOGOP);
556 myop.op_next = Nullop;
557 myop.op_flags = OPf_WANT_VOID;
558
559 PUSHMARK (SP);
560 XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
561 PUTBACK;
562 PL_op = (OP *)&myop;
563 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
564 SPAGAIN;
565 }
566
567 ENTER; /* necessary e.g. for dounwind */
568}
569
570static void
571free_coro_mortal ()
572{
573 if (coro_mortal)
574 {
575 SvREFCNT_dec (coro_mortal);
576 coro_mortal = 0;
577 }
578}
579
580/* inject a fake call to Coro::State::_cctx_init into the execution */
581static void NOINLINE
582prepare_cctx (coro_cctx *cctx)
583{
584 dSP;
585 LOGOP myop;
586
587 Zero (&myop, 1, LOGOP);
588 myop.op_next = PL_op;
589 myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
590
591 PUSHMARK (SP);
592 EXTEND (SP, 2);
593 PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
594 PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
595 PUTBACK;
596 PL_op = (OP *)&myop;
597 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
598 SPAGAIN;
599}
600
601static void
602coro_run (void *arg)
603{
604 /* coro_run is the alternative tail of transfer(), so unlock here. */
605 UNLOCK;
606
607 /*
608 * this is a _very_ stripped down perl interpreter ;)
609 */
610 PL_top_env = &PL_start_env;
611
612 /* inject call to cctx_init */
613 prepare_cctx ((coro_cctx *)arg);
614
615 /* somebody will hit me for both perl_run and PL_restartop */
616 PL_restartop = PL_op;
617 perl_run (PL_curinterp);
618
619 fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
620 abort ();
621}
622
623static coro_cctx *
624cctx_new ()
625{
626 coro_cctx *cctx;
627
628 ++cctx_count;
629
630 Newz (0, cctx, 1, coro_cctx);
631
632#if HAVE_MMAP
633
634 cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
635 /* mmap supposedly does allocate-on-write for us */
636 cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
637
638 if (cctx->sptr != (void *)-1)
639 {
640# if STACKGUARD
641 mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
642# endif
643 REGISTER_STACK (
644 cctx,
645 STACKGUARD * PAGESIZE + (char *)cctx->sptr,
646 cctx->ssize + (char *)cctx->sptr
647 );
648
649 coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
650 }
651 else
652#endif
653 {
654 cctx->ssize = -STACKSIZE * (long)sizeof (long);
655 New (0, cctx->sptr, STACKSIZE, long);
656
657 if (!cctx->sptr)
658 {
659 perror ("FATAL: unable to allocate stack for coroutine");
660 _exit (EXIT_FAILURE);
661 }
662
663 REGISTER_STACK (
664 cctx,
665 (char *)cctx->sptr,
666 (char *)cctx->sptr - cctx->ssize
667 );
668
669 coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, -cctx->ssize);
670 }
671
672 return cctx;
673}
674
675static void
676cctx_destroy (coro_cctx *cctx)
677{
678 if (!cctx)
679 return;
680
681 --cctx_count;
682
683#if USE_VALGRIND
684 VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
685#endif
686
687#if HAVE_MMAP
688 if (cctx->ssize > 0)
689 munmap (cctx->sptr, cctx->ssize);
690 else
691#endif
692 Safefree (cctx->sptr);
693
694 Safefree (cctx);
695}
696
697static coro_cctx *
698cctx_get ()
699{
700 coro_cctx *cctx;
701
702 if (cctx_first)
703 {
704 cctx = cctx_first;
705 cctx_first = cctx->next;
706 --cctx_idle;
707 }
708 else
709 {
710 cctx = cctx_new ();
711 PL_op = PL_op->op_next;
712 }
713
714 return cctx;
715}
716
717static void
718cctx_put (coro_cctx *cctx)
719{
720 /* free another cctx if overlimit */
721 if (cctx_idle >= MAX_IDLE_CCTX)
722 {
723 coro_cctx *first = cctx_first;
724 cctx_first = first->next;
725 --cctx_idle;
726
727 assert (!first->inuse);
728 cctx_destroy (first);
729 }
730
731 ++cctx_idle;
732 cctx->next = cctx_first;
733 cctx_first = cctx;
734}
735
736/** coroutine switching *****************************************************/
737
738/* never call directly, always through the coro_state_transfer global variable */
739static void NOINLINE
740transfer (struct coro *prev, struct coro *next)
741{
742 dSTACKLEVEL;
743
744 /* sometimes transfer is only called to set idle_sp */
745 if (!next)
746 {
747 ((coro_cctx *)prev)->idle_sp = STACKLEVEL;
748 assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
749 }
750 else if (prev != next)
751 {
752 coro_cctx *prev__cctx;
753
754 if (prev->flags & CF_NEW)
755 {
756 /* create a new empty context */
757 Newz (0, prev->cctx, 1, coro_cctx);
758 prev->cctx->inuse = 1;
759 prev->flags &= ~CF_NEW;
760 prev->flags |= CF_RUNNING;
761 }
762
763 /*TODO: must not croak here */
764 if (!prev->flags & CF_RUNNING)
765 croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
766
767 if (next->flags & CF_RUNNING)
768 croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
769
770 if (next->flags & CF_DESTROYED)
771 croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
772
773 prev->flags &= ~CF_RUNNING;
774 next->flags |= CF_RUNNING;
775
776 LOCK;
777
778 if (next->flags & CF_NEW)
779 {
780 /* need to start coroutine */
781 next->flags &= ~CF_NEW;
782 /* first get rid of the old state */
783 save_perl (prev);
784 /* setup coroutine call */
785 setup_coro (next);
786 /* need a new stack */
787 assert (!next->cctx);
788 }
789 else
790 {
791 /* coroutine already started */
792 save_perl (prev);
793 load_perl (next);
794 }
795
796 prev__cctx = prev->cctx;
797
798 /* possibly "free" the cctx */
799 if (prev__cctx->idle_sp == STACKLEVEL)
800 {
801 /* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
802 assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
803
804 prev->cctx = 0;
805
806 cctx_put (prev__cctx);
807 prev__cctx->inuse = 0;
808 }
809
810 if (!next->cctx)
811 {
812 next->cctx = cctx_get ();
813 assert (!next->cctx->inuse);
814 next->cctx->inuse = 1;
815 }
816
817 if (prev__cctx != next->cctx)
818 {
819 prev__cctx->top_env = PL_top_env;
820 PL_top_env = next->cctx->top_env;
821 coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
822 }
823
824 free_coro_mortal ();
825 UNLOCK;
826 }
827}
828
829struct transfer_args
830{
831 struct coro *prev, *next;
832};
833
834#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
835
836/** high level stuff ********************************************************/
837
838static int
839coro_state_destroy (struct coro *coro)
840{
841 if (coro->flags & CF_DESTROYED)
842 return 0;
843
844 coro->flags |= CF_DESTROYED;
845
846 if (coro->flags & CF_READY)
847 {
848 /* reduce nready, as destroying a ready coro effectively unreadies it */
849 /* alternative: look through all ready queues and remove the coro */
850 LOCK;
851 --coro_nready;
852 UNLOCK;
853 }
854 else
855 coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
856
857 if (coro->mainstack && coro->mainstack != main_mainstack)
858 {
859 struct coro temp;
860
861 assert (!(coro->flags & CF_RUNNING));
862
863 Zero (&temp, 1, struct coro);
864 temp.save = CORO_SAVE_ALL;
865
866 if (coro->flags & CF_RUNNING)
867 croak ("FATAL: tried to destroy currently running coroutine");
868
869 save_perl (&temp);
870 load_perl (coro);
871
872 coro_destroy_stacks ();
873
874 load_perl (&temp); /* this will get rid of defsv etc.. */
875
876 coro->mainstack = 0;
877 }
878
879 cctx_destroy (coro->cctx);
880 SvREFCNT_dec (coro->args);
881
882 return 1;
883}
884
885static int
886coro_state_free (pTHX_ SV *sv, MAGIC *mg)
887{
888 struct coro *coro = (struct coro *)mg->mg_ptr;
889 mg->mg_ptr = 0;
890
891 if (--coro->refcnt < 0)
892 {
893 coro_state_destroy (coro);
894 Safefree (coro);
895 }
896
897 return 0;
898}
899
900static int
901coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
902{
903 struct coro *coro = (struct coro *)mg->mg_ptr;
904
905 ++coro->refcnt;
906
907 return 0;
908}
909
910static MGVTBL coro_state_vtbl = {
911 0, 0, 0, 0,
912 coro_state_free,
913 0,
914#ifdef MGf_DUP
915 coro_state_dup,
916#else
917# define MGf_DUP 0
918#endif
919};
920
921static struct coro *
922SvSTATE (SV *coro)
923{
924 HV *stash;
925 MAGIC *mg;
926
927 if (SvROK (coro))
928 coro = SvRV (coro);
929
930 stash = SvSTASH (coro);
931 if (stash != coro_stash && stash != coro_state_stash)
932 {
933 /* very slow, but rare, check */
934 if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
935 croak ("Coro::State object required");
936 }
937
938 mg = SvMAGIC (coro);
939 assert (mg->mg_type == PERL_MAGIC_ext);
940 return (struct coro *)mg->mg_ptr;
941}
942
943static void
944prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
945{
946 ta->prev = SvSTATE (prev_sv);
947 ta->next = SvSTATE (next_sv);
948}
949
950static void
951api_transfer (SV *prev_sv, SV *next_sv)
952{
953 struct transfer_args ta;
954
955 prepare_transfer (&ta, prev_sv, next_sv);
956 TRANSFER (ta);
957}
958
959static int
960api_save (SV *coro_sv, int new_save)
961{
962 struct coro *coro = SvSTATE (coro_sv);
963 int old_save = coro->save;
964
965 if (new_save >= 0)
966 coro->save = new_save;
967
968 return old_save;
969}
970
971/** Coro ********************************************************************/
972
973static void
974coro_enq (SV *coro_sv)
975{
976 av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
808} 977}
809 978
810static SV * 979static SV *
811coro_deq (int min_prio) 980coro_deq (int min_prio)
812{ 981{
… …
815 min_prio -= PRIO_MIN; 984 min_prio -= PRIO_MIN;
816 if (min_prio < 0) 985 if (min_prio < 0)
817 min_prio = 0; 986 min_prio = 0;
818 987
819 for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; ) 988 for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
820 if (av_len (coro_ready[prio]) >= 0) 989 if (AvFILLp (coro_ready [prio]) >= 0)
821 return av_shift (coro_ready[prio]); 990 return av_shift (coro_ready [prio]);
822 991
823 return 0; 992 return 0;
824} 993}
825 994
995static int
996api_ready (SV *coro_sv)
997{
998 struct coro *coro;
999
1000 if (SvROK (coro_sv))
1001 coro_sv = SvRV (coro_sv);
1002
1003 coro = SvSTATE (coro_sv);
1004
1005 if (coro->flags & CF_READY)
1006 return 0;
1007
1008 coro->flags |= CF_READY;
1009
1010 LOCK;
1011 coro_enq (SvREFCNT_inc (coro_sv));
1012 ++coro_nready;
1013 UNLOCK;
1014
1015 return 1;
1016}
1017
1018static int
1019api_is_ready (SV *coro_sv)
1020{
1021 return !!(SvSTATE (coro_sv)->flags & CF_READY);
1022}
1023
1024static void
1025prepare_schedule (struct transfer_args *ta)
1026{
1027 SV *prev_sv, *next_sv;
1028
1029 for (;;)
1030 {
1031 LOCK;
1032 next_sv = coro_deq (PRIO_MIN);
1033
1034 /* nothing to schedule: call the idle handler */
1035 if (!next_sv)
1036 {
1037 dSP;
1038 UNLOCK;
1039
1040 ENTER;
1041 SAVETMPS;
1042
1043 PUSHMARK (SP);
1044 PUTBACK;
1045 call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
1046
1047 FREETMPS;
1048 LEAVE;
1049 continue;
1050 }
1051
1052 ta->next = SvSTATE (next_sv);
1053
1054 /* cannot transfer to destroyed coros, skip and look for next */
1055 if (ta->next->flags & CF_DESTROYED)
1056 {
1057 UNLOCK;
1058 SvREFCNT_dec (next_sv);
1059 /* coro_nready is already taken care of by destroy */
1060 continue;
1061 }
1062
1063 --coro_nready;
1064 UNLOCK;
1065 break;
1066 }
1067
1068 /* free this only after the transfer */
1069 prev_sv = SvRV (coro_current);
1070 SvRV_set (coro_current, next_sv);
1071 ta->prev = SvSTATE (prev_sv);
1072
1073 assert (ta->next->flags & CF_READY);
1074 ta->next->flags &= ~CF_READY;
1075
1076 LOCK;
1077 free_coro_mortal ();
1078 coro_mortal = prev_sv;
1079 UNLOCK;
1080}
1081
1082static void
1083prepare_cede (struct transfer_args *ta)
1084{
1085 api_ready (coro_current);
1086 prepare_schedule (ta);
1087}
1088
1089static int
1090prepare_cede_notself (struct transfer_args *ta)
1091{
1092 if (coro_nready)
1093 {
1094 SV *prev = SvRV (coro_current);
1095 prepare_schedule (ta);
1096 api_ready (prev);
1097 return 1;
1098 }
1099 else
1100 return 0;
1101}
1102
1103static void
1104api_schedule (void)
1105{
1106 struct transfer_args ta;
1107
1108 prepare_schedule (&ta);
1109 TRANSFER (ta);
1110}
1111
1112static int
1113api_cede (void)
1114{
1115 struct transfer_args ta;
1116
1117 prepare_cede (&ta);
1118
1119 if (ta.prev != ta.next)
1120 {
1121 TRANSFER (ta);
1122 return 1;
1123 }
1124 else
1125 return 0;
1126}
1127
1128static int
1129api_cede_notself (void)
1130{
1131 struct transfer_args ta;
1132
1133 if (prepare_cede_notself (&ta))
1134 {
1135 TRANSFER (ta);
1136 return 1;
1137 }
1138 else
1139 return 0;
1140}
1141
826MODULE = Coro::State PACKAGE = Coro::State 1142MODULE = Coro::State PACKAGE = Coro::State
827 1143
828PROTOTYPES: ENABLE 1144PROTOTYPES: DISABLE
829 1145
830BOOT: 1146BOOT:
831{ /* {} necessary for stoopid perl-5.6.x */ 1147{
832 ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1); 1148#ifdef USE_ITHREADS
833 PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1); 1149 MUTEX_INIT (&coro_mutex);
1150#endif
1151 BOOT_PAGESIZE;
1152
834 coro_state_stash = gv_stashpv ("Coro::State", TRUE); 1153 coro_state_stash = gv_stashpv ("Coro::State", TRUE);
835 1154
836 newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV)); 1155 newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
837 newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV)); 1156 newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
838 newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV)); 1157 newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
1158 newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
839 newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT)); 1159 newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
840
841 if (!padlist_cache)
842 padlist_cache = newHV ();
843 1160
844 main_mainstack = PL_mainstack; 1161 main_mainstack = PL_mainstack;
845}
846 1162
847Coro::State 1163 coroapi.ver = CORO_API_VERSION;
848_newprocess(args) 1164 coroapi.transfer = api_transfer;
849 SV * args 1165
850 PROTOTYPE: $ 1166 assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
1167}
1168
1169SV *
1170new (char *klass, ...)
851 CODE: 1171 CODE:
852 Coro__State coro; 1172{
1173 struct coro *coro;
1174 HV *hv;
1175 int i;
853 1176
854 if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
855 croak ("Coro::State::_newprocess expects an arrayref");
856
857 New (0, coro, 1, struct coro); 1177 Newz (0, coro, 1, struct coro);
1178 coro->args = newAV ();
1179 coro->save = CORO_SAVE_ALL;
1180 coro->flags = CF_NEW;
858 1181
859 coro->args = (AV *)SvREFCNT_inc (SvRV (args)); 1182 hv = newHV ();
860 coro->mainstack = 0; /* actual work is done inside transfer */ 1183 sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
861 coro->stack = 0; 1184 RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
862 1185
863 RETVAL = coro; 1186 for (i = 1; i < items; i++)
1187 av_push (coro->args, newSVsv (ST (i)));
1188}
864 OUTPUT: 1189 OUTPUT:
865 RETVAL 1190 RETVAL
866 1191
1192int
1193save (SV *coro, int new_save = -1)
1194 CODE:
1195 RETVAL = api_save (coro, new_save);
1196 OUTPUT:
1197 RETVAL
1198
867void 1199void
868transfer(prev, next, flags) 1200_set_stacklevel (...)
869 Coro::State_or_hashref prev 1201 ALIAS:
870 Coro::State_or_hashref next 1202 Coro::State::transfer = 1
871 int flags 1203 Coro::schedule = 2
872 PROTOTYPE: @ 1204 Coro::cede = 3
1205 Coro::cede_notself = 4
873 CODE: 1206 CODE:
874 PUTBACK; 1207{
875 transfer (aTHX_ prev, next, flags); 1208 struct transfer_args ta;
876 SPAGAIN; 1209
1210 switch (ix)
1211 {
1212 case 0:
1213 ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
1214 ta.next = 0;
1215 break;
1216
1217 case 1:
1218 if (items != 2)
1219 croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
1220
1221 prepare_transfer (&ta, ST (0), ST (1));
1222 break;
1223
1224 case 2:
1225 prepare_schedule (&ta);
1226 break;
1227
1228 case 3:
1229 prepare_cede (&ta);
1230 break;
1231
1232 case 4:
1233 if (!prepare_cede_notself (&ta))
1234 XSRETURN_EMPTY;
1235
1236 break;
1237 }
1238
1239 BARRIER;
1240 TRANSFER (ta);
1241
1242 if (GIMME_V != G_VOID && ta.next != ta.prev)
1243 XSRETURN_YES;
1244}
1245
1246bool
1247_destroy (SV *coro_sv)
1248 CODE:
1249 RETVAL = coro_state_destroy (SvSTATE (coro_sv));
1250 OUTPUT:
1251 RETVAL
877 1252
878void 1253void
879DESTROY(coro)
880 Coro::State coro
881 CODE:
882
883 if (coro->mainstack && coro->mainstack != main_mainstack)
884 {
885 struct coro temp;
886
887 SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);
888 LOAD(aTHX_ coro);
889
890 destroy_stacks (aTHX);
891
892 LOAD((&temp)); /* this will get rid of defsv etc.. */
893
894 coro->mainstack = 0;
895 }
896
897 deallocate_stack (coro);
898
899 Safefree (coro);
900
901void
902flush()
903 CODE:
904#ifdef MAY_FLUSH
905 flush_padlist_cache ();
906#endif
907
908void
909_exit(code) 1254_exit (code)
910 int code 1255 int code
911 PROTOTYPE: $ 1256 PROTOTYPE: $
912 CODE: 1257 CODE:
913#if defined(__GLIBC__) || _POSIX_C_SOURCE
914 _exit (code); 1258 _exit (code);
915#else
916 signal (SIGTERM, SIG_DFL);
917 raise (SIGTERM);
918 exit (code);
919#endif
920 1259
921MODULE = Coro::State PACKAGE = Coro::Cont 1260int
1261cctx_count ()
1262 CODE:
1263 RETVAL = cctx_count;
1264 OUTPUT:
1265 RETVAL
922 1266
923# this is slightly dirty (should expose a c-level api) 1267int
924 1268cctx_idle ()
925void 1269 CODE:
926yield(...) 1270 RETVAL = cctx_idle;
927 PROTOTYPE: @ 1271 OUTPUT:
928 CODE: 1272 RETVAL
929 static SV *returnstk;
930 SV *sv;
931 AV *defav = GvAV (PL_defgv);
932 struct coro *prev, *next;
933
934 if (!returnstk)
935 returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
936
937 /* set up @_ -- ugly */
938 av_clear (defav);
939 av_fill (defav, items - 1);
940 while (items--)
941 av_store (defav, items, SvREFCNT_inc (ST(items)));
942
943 mg_get (returnstk); /* isn't documentation wrong for mg_get? */
944 sv = av_pop ((AV *)SvRV (returnstk));
945 prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
946 next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
947 SvREFCNT_dec (sv);
948
949 transfer(aTHX_ prev, next, 0);
950 1273
951MODULE = Coro::State PACKAGE = Coro 1274MODULE = Coro::State PACKAGE = Coro
952 1275
953# this is slightly dirty (should expose a c-level api)
954
955BOOT: 1276BOOT:
956{ 1277{
957 int i; 1278 int i;
1279
958 HV *stash = gv_stashpv ("Coro", TRUE); 1280 coro_stash = gv_stashpv ("Coro", TRUE);
959 1281
960 newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX)); 1282 newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
961 newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH)); 1283 newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
962 newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL)); 1284 newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
963 newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW)); 1285 newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
964 newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE)); 1286 newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
965 newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN)); 1287 newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
966 1288
967 coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV); 1289 coro_current = get_sv ("Coro::current", FALSE);
968 coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV); 1290 SvREADONLY_on (coro_current);
969 1291
970 for (i = PRIO_MAX - PRIO_MIN + 1; i--; ) 1292 for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
971 coro_ready[i] = newAV (); 1293 coro_ready[i] = newAV ();
1294
1295 {
1296 SV *sv = perl_get_sv("Coro::API", 1);
1297
1298 coroapi.schedule = api_schedule;
1299 coroapi.save = api_save;
1300 coroapi.cede = api_cede;
1301 coroapi.cede_notself = api_cede_notself;
1302 coroapi.ready = api_ready;
1303 coroapi.is_ready = api_is_ready;
1304 coroapi.nready = &coro_nready;
1305 coroapi.current = coro_current;
1306
1307 GCoroAPI = &coroapi;
1308 sv_setiv (sv, (IV)&coroapi);
1309 SvREADONLY_on (sv);
1310 }
972} 1311}
973 1312
974void 1313void
975ready(self) 1314_set_current (SV *current)
976 SV * self 1315 PROTOTYPE: $
977 CODE: 1316 CODE:
978 coro_enq (SvREFCNT_inc (self)); 1317 SvREFCNT_dec (SvRV (coro_current));
1318 SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1319
1320int
1321prio (Coro::State coro, int newprio = 0)
1322 ALIAS:
1323 nice = 1
1324 CODE:
1325{
1326 RETVAL = coro->prio;
1327
1328 if (items > 1)
1329 {
1330 if (ix)
1331 newprio = coro->prio - newprio;
1332
1333 if (newprio < PRIO_MIN) newprio = PRIO_MIN;
1334 if (newprio > PRIO_MAX) newprio = PRIO_MAX;
1335
1336 coro->prio = newprio;
1337 }
1338}
1339 OUTPUT:
1340 RETVAL
1341
1342SV *
1343ready (SV *self)
1344 PROTOTYPE: $
1345 CODE:
1346 RETVAL = boolSV (api_ready (self));
1347 OUTPUT:
1348 RETVAL
1349
1350SV *
1351is_ready (SV *self)
1352 PROTOTYPE: $
1353 CODE:
1354 RETVAL = boolSV (api_is_ready (self));
1355 OUTPUT:
1356 RETVAL
1357
1358int
1359nready (...)
1360 PROTOTYPE:
1361 CODE:
1362 RETVAL = coro_nready;
1363 OUTPUT:
1364 RETVAL
1365
1366MODULE = Coro::State PACKAGE = Coro::AIO
1367
1368SV *
1369_get_state ()
1370 CODE:
1371{
1372 struct io_state *data;
1373
1374 RETVAL = newSV (sizeof (struct io_state));
1375 data = (struct io_state *)SvPVX (RETVAL);
1376 SvCUR_set (RETVAL, sizeof (struct io_state));
1377 SvPOK_only (RETVAL);
1378
1379 data->errorno = errno;
1380 data->laststype = PL_laststype;
1381 data->laststatval = PL_laststatval;
1382 data->statcache = PL_statcache;
1383}
1384 OUTPUT:
1385 RETVAL
979 1386
980void 1387void
981schedule(...) 1388_set_state (char *data_)
982 ALIAS: 1389 PROTOTYPE: $
983 cede = 1
984 CODE: 1390 CODE:
985 SV *prev, *next; 1391{
1392 struct io_state *data = (void *)data_;
986 1393
987 prev = GvSV (coro_current); 1394 errno = data->errorno;
1395 PL_laststype = data->laststype;
1396 PL_laststatval = data->laststatval;
1397 PL_statcache = data->statcache;
1398}
988 1399
989 if (ix)
990 coro_enq (SvREFCNT_inc (prev));
991
992 next = coro_deq (PRIO_MIN);
993
994 if (!next)
995 next = SvREFCNT_inc (GvSV (coro_idle));
996
997 GvSV (coro_current) = SvREFCNT_inc (next);
998 transfer (sv_to_coro (prev, "Coro::schedule", "current coroutine"),
999 sv_to_coro (next, "Coro::schedule", "next coroutine"),
1000 TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
1001 SvREFCNT_dec (next);
1002 SvREFCNT_dec (prev);
1003

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