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Comparing Coro/Coro/State.xs (file contents):
Revision 1.32 by root, Sun Aug 26 17:01:54 2001 UTC vs.
Revision 1.278 by root, Sun Nov 16 07:09:28 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#include "libcoro/coro.c" 11#include "patchlevel.h"
6 12
7#include <signal.h> 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
22#else
23# include <inttypes.h> /* most portable stdint.h */
24#endif
8 25
9#ifdef HAVE_MMAP 26#ifdef HAVE_MMAP
10# include <unistd.h> 27# include <unistd.h>
11# include <sys/mman.h> 28# include <sys/mman.h>
12# ifndef MAP_ANON
13# ifdef MAP_ANONYMOUS 29# ifndef MAP_ANONYMOUS
14# define MAP_ANON MAP_ANONYMOUS 30# ifdef MAP_ANON
31# define MAP_ANONYMOUS MAP_ANON
15# else 32# else
16# undef HAVE_MMAP 33# undef HAVE_MMAP
17# endif 34# endif
18# 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
19#endif 43# endif
44#else
45# define PAGESIZE 0
46# define BOOT_PAGESIZE (void)0
47#endif
20 48
21#define MAY_FLUSH /* increases codesize and is rarely used */ 49#if CORO_USE_VALGRIND
50# include <valgrind/valgrind.h>
51#endif
22 52
23#define SUB_INIT "Coro::State::initialize" 53/* the maximum number of idle cctx that will be pooled */
24#define UCORO_STATE "_coro_state" 54static int cctx_max_idle = 4;
25 55
26/* The next macro should declare a variable stacklevel that contains and approximation 56#define PERL_VERSION_ATLEAST(a,b,c) \
27 * to the current C stack pointer. Its property is that it changes with each call 57 (PERL_REVISION > (a) \
28 * and should be unique. */ 58 || (PERL_REVISION == (a) \
59 && (PERL_VERSION > (b) \
60 || (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
61
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
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
101/* 5.8.7 */
102#ifndef SvRV_set
103# define SvRV_set(s,v) SvRV(s) = (v)
104#endif
105
106#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
107# undef CORO_STACKGUARD
108#endif
109
110#ifndef CORO_STACKGUARD
111# define CORO_STACKGUARD 0
112#endif
113
114/* prefer perl internal functions over our own? */
115#ifndef CORO_PREFER_PERL_FUNCTIONS
116# define CORO_PREFER_PERL_FUNCTIONS 0
117#endif
118
119/* The next macros try to return the current stack pointer, in an as
120 * portable way as possible. */
121#if __GNUC__ >= 4
122# define dSTACKLEVEL void *stacklevel = __builtin_frame_address (0)
123#else
29#define dSTACKLEVEL void *stacklevel = &stacklevel 124# define dSTACKLEVEL volatile void *stacklevel = (volatile void *)&stacklevel
125#endif
30 126
31#define labs(l) ((l) >= 0 ? (l) : -(l)) 127#define IN_DESTRUCT (PL_main_cv == Nullcv)
128
129#if __GNUC__ >= 3
130# define attribute(x) __attribute__(x)
131# define expect(expr,value) __builtin_expect ((expr),(value))
132# define INLINE static inline
133#else
134# define attribute(x)
135# define expect(expr,value) (expr)
136# define INLINE static
137#endif
138
139#define expect_false(expr) expect ((expr) != 0, 0)
140#define expect_true(expr) expect ((expr) != 0, 1)
141
142#define NOINLINE attribute ((noinline))
32 143
33#include "CoroAPI.h" 144#include "CoroAPI.h"
34 145
146#ifdef USE_ITHREADS
147
148static perl_mutex coro_lock;
149# define LOCK do { MUTEX_LOCK (&coro_lock); } while (0)
150# define UNLOCK do { MUTEX_UNLOCK (&coro_lock); } while (0)
151# if CORO_PTHREAD
152static void *coro_thx;
153# endif
154
155#else
156
157# define LOCK (void)0
158# define UNLOCK (void)0
159
160#endif
161
162# undef LOCK
163# define LOCK (void)0
164# undef UNLOCK
165# define UNLOCK (void)0
166
167/* helper storage struct for Coro::AIO */
168struct io_state
169{
170 AV *res;
171 int errorno;
172 I32 laststype; /* U16 in 5.10.0 */
173 int laststatval;
174 Stat_t statcache;
175};
176
177static double (*nvtime)(); /* so why doesn't it take void? */
178
179static U32 cctx_gen;
180static size_t cctx_stacksize = CORO_STACKSIZE;
35static struct CoroAPI coroapi; 181static struct CoroAPI coroapi;
182static AV *main_mainstack; /* used to differentiate between $main and others */
183static JMPENV *main_top_env;
184static HV *coro_state_stash, *coro_stash;
185static volatile SV *coro_mortal; /* will be freed/thrown after next transfer */
186static volatile struct coro *transfer_next;
36 187
37/* this is actually not only the c stack but also c registers etc... */ 188static GV *irsgv; /* $/ */
189static GV *stdoutgv; /* *STDOUT */
190static SV *rv_diehook;
191static SV *rv_warnhook;
192static HV *hv_sig; /* %SIG */
193
194/* async_pool helper stuff */
195static SV *sv_pool_rss;
196static SV *sv_pool_size;
197static AV *av_async_pool;
198
199/* Coro::AnyEvent */
200static SV *sv_activity;
201
202static struct coro_cctx *cctx_first;
203static int cctx_count, cctx_idle;
204
205enum {
206 CC_MAPPED = 0x01,
207 CC_NOREUSE = 0x02, /* throw this away after tracing */
208 CC_TRACE = 0x04,
209 CC_TRACE_SUB = 0x08, /* trace sub calls */
210 CC_TRACE_LINE = 0x10, /* trace each statement */
211 CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
212};
213
214/* this is a structure representing a c-level coroutine */
38typedef struct { 215typedef struct coro_cctx
39 int refcnt; /* pointer reference counter */ 216{
40 int usecnt; /* shared by how many coroutines */ 217 struct coro_cctx *next;
41 int gencnt; /* generation counter */
42 218
219 /* the stack */
220 void *sptr;
221 size_t ssize;
222
223 /* cpu state */
224 void *idle_sp; /* sp of top-level transfer/schedule/cede call */
225 JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
226 JMPENV *top_env;
43 coro_context cctx; 227 coro_context cctx;
44 228
45 void *sptr; 229 U32 gen;
46 long ssize; /* positive == mmap, otherwise malloc */ 230#if CORO_USE_VALGRIND
47} coro_stack; 231 int valgrind_id;
232#endif
233 unsigned char flags;
234} coro_cctx;
48 235
236enum {
237 CF_RUNNING = 0x0001, /* coroutine is running */
238 CF_READY = 0x0002, /* coroutine is ready */
239 CF_NEW = 0x0004, /* has never been switched to */
240 CF_DESTROYED = 0x0008, /* coroutine data has been freed */
241};
242
243/* the structure where most of the perl state is stored, overlaid on the cxstack */
244typedef struct
245{
246 SV *defsv;
247 AV *defav;
248 SV *errsv;
249 SV *irsgv;
250#define VAR(name,type) type name;
251# include "state.h"
252#undef VAR
253} perl_slots;
254
255#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
256
257/* this is a structure representing a perl-level coroutine */
49struct coro { 258struct coro {
50 /* the optional C context */ 259 /* the C coroutine allocated to this perl coroutine, if any */
51 coro_stack *stack; 260 coro_cctx *cctx;
52 void *cursp;
53 int gencnt;
54 261
55 /* optionally saved, might be zero */ 262 /* process data */
56 AV *defav; 263 struct CoroSLF slf_frame; /* saved slf frame */
57 SV *defsv;
58 SV *errsv;
59
60 /* saved global state not related to stacks */
61 U8 dowarn;
62 I32 in_eval;
63
64 /* the stacks and related info (callchain etc..) */
65 PERL_SI *curstackinfo;
66 AV *curstack;
67 AV *mainstack; 264 AV *mainstack;
68 SV **stack_sp; 265 perl_slots *slot; /* basically the saved sp */
69 OP *op;
70 SV **curpad;
71 SV **stack_base;
72 SV **stack_max;
73 SV **tmps_stack;
74 I32 tmps_floor;
75 I32 tmps_ix;
76 I32 tmps_max;
77 I32 *markstack;
78 I32 *markstack_ptr;
79 I32 *markstack_max;
80 I32 *scopestack;
81 I32 scopestack_ix;
82 I32 scopestack_max;
83 ANY *savestack;
84 I32 savestack_ix;
85 I32 savestack_max;
86 OP **retstack;
87 I32 retstack_ix;
88 I32 retstack_max;
89 COP *curcop;
90 JMPENV *top_env;
91 266
92 /* data associated with this coroutine (initial args) */ 267 AV *args; /* data associated with this coroutine (initial args) */
93 AV *args; 268 int refcnt; /* coroutines are refcounted, yes */
269 int flags; /* CF_ flags */
270 HV *hv; /* the perl hash associated with this coro, if any */
271
272 /* statistics */
273 int usecount; /* number of transfers to this coro */
274
275 /* coro process data */
276 int prio;
277 SV *throw; /* exception to be thrown */
278
279 /* async_pool */
280 SV *saved_deffh;
281
282 /* linked list */
283 struct coro *next, *prev;
94}; 284};
95 285
96typedef struct coro *Coro__State; 286typedef struct coro *Coro__State;
97typedef struct coro *Coro__State_or_hashref; 287typedef struct coro *Coro__State_or_hashref;
98 288
99static AV *main_mainstack; /* used to differentiate between $main and others */ 289static struct CoroSLF slf_frame; /* the current slf frame */
100static HV *coro_state_stash;
101static SV *ucoro_state_sv;
102static U32 ucoro_state_hash;
103static HV *padlist_cache;
104
105/* mostly copied from op.c:cv_clone2 */
106STATIC AV *
107clone_padlist (AV *protopadlist)
108{
109 AV *av;
110 I32 ix;
111 AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
112 AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
113 SV **pname = AvARRAY (protopad_name);
114 SV **ppad = AvARRAY (protopad);
115 I32 fname = AvFILLp (protopad_name);
116 I32 fpad = AvFILLp (protopad);
117 AV *newpadlist, *newpad_name, *newpad;
118 SV **npad;
119
120 newpad_name = newAV ();
121 for (ix = fname; ix >= 0; ix--)
122 av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
123
124 newpad = newAV ();
125 av_fill (newpad, AvFILLp (protopad));
126 npad = AvARRAY (newpad);
127
128 newpadlist = newAV ();
129 AvREAL_off (newpadlist);
130 av_store (newpadlist, 0, (SV *) newpad_name);
131 av_store (newpadlist, 1, (SV *) newpad);
132
133 av = newAV (); /* will be @_ */
134 av_extend (av, 0);
135 av_store (newpad, 0, (SV *) av);
136 AvFLAGS (av) = AVf_REIFY;
137
138 for (ix = fpad; ix > 0; ix--)
139 {
140 SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;
141 if (namesv && namesv != &PL_sv_undef)
142 {
143 char *name = SvPVX (namesv); /* XXX */
144 if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')
145 { /* lexical from outside? */
146 npad[ix] = SvREFCNT_inc (ppad[ix]);
147 }
148 else
149 { /* our own lexical */
150 SV *sv;
151 if (*name == '&')
152 sv = SvREFCNT_inc (ppad[ix]);
153 else if (*name == '@')
154 sv = (SV *) newAV ();
155 else if (*name == '%')
156 sv = (SV *) newHV ();
157 else
158 sv = NEWSV (0, 0);
159 if (!SvPADBUSY (sv))
160 SvPADMY_on (sv);
161 npad[ix] = sv;
162 }
163 }
164 else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
165 {
166 npad[ix] = SvREFCNT_inc (ppad[ix]);
167 }
168 else
169 {
170 SV *sv = NEWSV (0, 0);
171 SvPADTMP_on (sv);
172 npad[ix] = sv;
173 }
174 }
175
176#if 0 /* return -ENOTUNDERSTOOD */
177 /* Now that vars are all in place, clone nested closures. */
178
179 for (ix = fpad; ix > 0; ix--) {
180 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
181 if (namesv
182 && namesv != &PL_sv_undef
183 && !(SvFLAGS(namesv) & SVf_FAKE)
184 && *SvPVX(namesv) == '&'
185 && CvCLONE(ppad[ix]))
186 {
187 CV *kid = cv_clone((CV*)ppad[ix]);
188 SvREFCNT_dec(ppad[ix]);
189 CvCLONE_on(kid);
190 SvPADMY_on(kid);
191 npad[ix] = (SV*)kid;
192 }
193 }
194#endif
195
196 return newpadlist;
197}
198
199#ifdef MAY_FLUSH
200STATIC void
201free_padlist (AV *padlist)
202{
203 /* may be during global destruction */
204 if (SvREFCNT(padlist))
205 {
206 I32 i = AvFILLp(padlist);
207 while (i >= 0)
208 {
209 SV **svp = av_fetch(padlist, i--, FALSE);
210 SV *sv = svp ? *svp : Nullsv;
211 if (sv)
212 SvREFCNT_dec(sv);
213 }
214
215 SvREFCNT_dec((SV*)padlist);
216 }
217}
218#endif
219
220/* the next two functions merely cache the padlists */
221STATIC void
222get_padlist (CV *cv)
223{
224 SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
225
226 if (he && AvFILLp ((AV *)*he) >= 0)
227 CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
228 else
229 CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
230}
231
232STATIC void
233put_padlist (CV *cv)
234{
235 SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
236
237 if (SvTYPE (*he) != SVt_PVAV)
238 {
239 SvREFCNT_dec (*he);
240 *he = (SV *)newAV ();
241 }
242
243 av_push ((AV *)*he, (SV *)CvPADLIST (cv));
244}
245
246#ifdef MAY_FLUSH
247STATIC void
248flush_padlist_cache ()
249{
250 HV *hv = padlist_cache;
251 padlist_cache = newHV ();
252
253 if (hv_iterinit (hv))
254 {
255 HE *he;
256 AV *padlist;
257
258 while (!!(he = hv_iternext (hv)))
259 {
260 AV *av = (AV *)HeVAL(he);
261
262 /* casting is fun. */
263 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
264 free_padlist (padlist);
265 }
266 }
267
268 SvREFCNT_dec (hv);
269}
270#endif
271
272#define SB do {
273#define SE } while (0)
274
275#define LOAD(state) load_state(aTHX_ (state));
276#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
277
278#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE
279
280static void
281load_state(pTHX_ Coro__State c)
282{
283 PL_dowarn = c->dowarn;
284 PL_in_eval = c->in_eval;
285
286 PL_curstackinfo = c->curstackinfo;
287 PL_curstack = c->curstack;
288 PL_mainstack = c->mainstack;
289 PL_stack_sp = c->stack_sp;
290 PL_op = c->op;
291 PL_curpad = c->curpad;
292 PL_stack_base = c->stack_base;
293 PL_stack_max = c->stack_max;
294 PL_tmps_stack = c->tmps_stack;
295 PL_tmps_floor = c->tmps_floor;
296 PL_tmps_ix = c->tmps_ix;
297 PL_tmps_max = c->tmps_max;
298 PL_markstack = c->markstack;
299 PL_markstack_ptr = c->markstack_ptr;
300 PL_markstack_max = c->markstack_max;
301 PL_scopestack = c->scopestack;
302 PL_scopestack_ix = c->scopestack_ix;
303 PL_scopestack_max = c->scopestack_max;
304 PL_savestack = c->savestack;
305 PL_savestack_ix = c->savestack_ix;
306 PL_savestack_max = c->savestack_max;
307 PL_retstack = c->retstack;
308 PL_retstack_ix = c->retstack_ix;
309 PL_retstack_max = c->retstack_max;
310 PL_curcop = c->curcop;
311 PL_top_env = c->top_env;
312
313 if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
314 if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
315 if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
316
317 {
318 dSP;
319 CV *cv;
320
321 /* now do the ugly restore mess */
322 while ((cv = (CV *)POPs))
323 {
324 AV *padlist = (AV *)POPs;
325
326 if (padlist)
327 {
328 put_padlist (cv); /* mark this padlist as available */
329 CvPADLIST(cv) = padlist;
330#ifdef USE_THREADS
331 /*CvOWNER(cv) = (struct perl_thread *)POPs;*/
332#endif
333 }
334
335 ++CvDEPTH(cv);
336 }
337
338 PUTBACK;
339 }
340}
341
342static void
343save_state(pTHX_ Coro__State c, int flags)
344{
345 {
346 dSP;
347 I32 cxix = cxstack_ix;
348 PERL_CONTEXT *ccstk = cxstack;
349 PERL_SI *top_si = PL_curstackinfo;
350
351 /*
352 * the worst thing you can imagine happens first - we have to save
353 * (and reinitialize) all cv's in the whole callchain :(
354 */
355
356 PUSHs (Nullsv);
357 /* this loop was inspired by pp_caller */
358 for (;;)
359 {
360 while (cxix >= 0)
361 {
362 PERL_CONTEXT *cx = &ccstk[cxix--];
363
364 if (CxTYPE(cx) == CXt_SUB)
365 {
366 CV *cv = cx->blk_sub.cv;
367 if (CvDEPTH(cv))
368 {
369#ifdef USE_THREADS
370 /*XPUSHs ((SV *)CvOWNER(cv));*/
371 /*CvOWNER(cv) = 0;*/
372 /*error must unlock this cv etc.. etc...*/
373#endif
374 EXTEND (SP, CvDEPTH(cv)*2);
375
376 while (--CvDEPTH(cv))
377 {
378 /* this tells the restore code to increment CvDEPTH */
379 PUSHs (Nullsv);
380 PUSHs ((SV *)cv);
381 }
382
383 PUSHs ((SV *)CvPADLIST(cv));
384 PUSHs ((SV *)cv);
385
386 get_padlist (cv); /* this is a monster */
387 }
388 }
389 else if (CxTYPE(cx) == CXt_FORMAT)
390 {
391 /* I never used formats, so how should I know how these are implemented? */
392 /* my bold guess is as a simple, plain sub... */
393 croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
394 }
395 }
396
397 if (top_si->si_type == PERLSI_MAIN)
398 break;
399
400 top_si = top_si->si_prev;
401 ccstk = top_si->si_cxstack;
402 cxix = top_si->si_cxix;
403 }
404
405 PUTBACK;
406 }
407
408 c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
409 c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
410 c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
411
412 c->dowarn = PL_dowarn;
413 c->in_eval = PL_in_eval;
414
415 c->curstackinfo = PL_curstackinfo;
416 c->curstack = PL_curstack;
417 c->mainstack = PL_mainstack;
418 c->stack_sp = PL_stack_sp;
419 c->op = PL_op;
420 c->curpad = PL_curpad;
421 c->stack_base = PL_stack_base;
422 c->stack_max = PL_stack_max;
423 c->tmps_stack = PL_tmps_stack;
424 c->tmps_floor = PL_tmps_floor;
425 c->tmps_ix = PL_tmps_ix;
426 c->tmps_max = PL_tmps_max;
427 c->markstack = PL_markstack;
428 c->markstack_ptr = PL_markstack_ptr;
429 c->markstack_max = PL_markstack_max;
430 c->scopestack = PL_scopestack;
431 c->scopestack_ix = PL_scopestack_ix;
432 c->scopestack_max = PL_scopestack_max;
433 c->savestack = PL_savestack;
434 c->savestack_ix = PL_savestack_ix;
435 c->savestack_max = PL_savestack_max;
436 c->retstack = PL_retstack;
437 c->retstack_ix = PL_retstack_ix;
438 c->retstack_max = PL_retstack_max;
439 c->curcop = PL_curcop;
440 c->top_env = PL_top_env;
441}
442
443/*
444 * allocate various perl stacks. This is an exact copy
445 * of perl.c:init_stacks, except that it uses less memory
446 * on the assumption that coroutines do not usually need
447 * a lot of stackspace.
448 */
449STATIC void
450coro_init_stacks (pTHX)
451{
452 PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
453 PL_curstackinfo->si_type = PERLSI_MAIN;
454 PL_curstack = PL_curstackinfo->si_stack;
455 PL_mainstack = PL_curstack; /* remember in case we switch stacks */
456
457 PL_stack_base = AvARRAY(PL_curstack);
458 PL_stack_sp = PL_stack_base;
459 PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
460
461 New(50,PL_tmps_stack,96,SV*);
462 PL_tmps_floor = -1;
463 PL_tmps_ix = -1;
464 PL_tmps_max = 96;
465
466 New(54,PL_markstack,16,I32);
467 PL_markstack_ptr = PL_markstack;
468 PL_markstack_max = PL_markstack + 16;
469
470 SET_MARK_OFFSET;
471
472 New(54,PL_scopestack,16,I32);
473 PL_scopestack_ix = 0;
474 PL_scopestack_max = 16;
475
476 New(54,PL_savestack,96,ANY);
477 PL_savestack_ix = 0;
478 PL_savestack_max = 96;
479
480 New(54,PL_retstack,8,OP*);
481 PL_retstack_ix = 0;
482 PL_retstack_max = 8;
483}
484
485/*
486 * destroy the stacks, the callchain etc...
487 * still there is a memleak of 128 bytes...
488 */
489STATIC void
490destroy_stacks(pTHX)
491{
492 int destruct = PL_main_cv != Nullcv;
493
494 if (destruct)
495 {
496 /* is this ugly, I ask? */
497 while (PL_scopestack_ix)
498 LEAVE;
499
500 /* sure it is, but more important: is it correct?? :/ */
501 while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
502 FREETMPS;
503 }
504
505 while (PL_curstackinfo->si_next)
506 PL_curstackinfo = PL_curstackinfo->si_next;
507
508 while (PL_curstackinfo)
509 {
510 PERL_SI *p = PL_curstackinfo->si_prev;
511
512 {
513 dSP;
514 SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
515 PUTBACK; /* possibly superfluous */
516 }
517
518 if (destruct)
519 {
520 dounwind(-1);
521 SvREFCNT_dec(PL_curstackinfo->si_stack);
522 }
523
524 Safefree(PL_curstackinfo->si_cxstack);
525 Safefree(PL_curstackinfo);
526 PL_curstackinfo = p;
527 }
528
529 Safefree(PL_tmps_stack);
530 Safefree(PL_markstack);
531 Safefree(PL_scopestack);
532 Safefree(PL_savestack);
533 Safefree(PL_retstack);
534}
535
536static void
537allocate_stack (Coro__State ctx, int alloc)
538{
539 coro_stack *stack;
540
541 New (0, stack, 1, coro_stack);
542
543 stack->refcnt = 1;
544 stack->usecnt = 1;
545 stack->gencnt = ctx->gencnt = 0;
546 if (alloc)
547 {
548#ifdef HAVE_MMAP
549 stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
550 stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
551 if (stack->sptr == (void *)-1)
552#endif
553 {
554 /*FIXME*//*D*//* reasonable stack size! */
555 stack->ssize = -4096 * sizeof (long);
556 New (0, stack->sptr, 4096, long);
557 }
558 }
559 else
560 stack->sptr = 0;
561
562 ctx->stack = stack;
563}
564
565static void
566deallocate_stack (Coro__State ctx)
567{
568 coro_stack *stack = ctx->stack;
569
570 ctx->stack = 0;
571
572 if (stack)
573 {
574 if (!--stack->refcnt)
575 {
576#ifdef HAVE_MMAP
577 if (stack->ssize > 0 && stack->sptr)
578 munmap (stack->sptr, stack->ssize);
579 else
580#else
581 Safefree (stack->sptr);
582#endif
583 Safefree (stack);
584 }
585 else if (ctx->gencnt == stack->gencnt)
586 --stack->usecnt;
587 }
588}
589
590static void
591setup_coro (void *arg)
592{
593 /*
594 * emulate part of the perl startup here.
595 */
596 dSP;
597 Coro__State ctx = (Coro__State)arg;
598 SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
599
600 coro_init_stacks (aTHX);
601 /*PL_curcop = 0;*/
602 /*PL_in_eval = PL_in_eval;*/ /* inherit */
603 SvREFCNT_dec (GvAV (PL_defgv));
604 GvAV (PL_defgv) = ctx->args;
605
606 SPAGAIN;
607
608 if (ctx->stack)
609 {
610 ctx->cursp = 0;
611
612 PUSHMARK(SP);
613 PUTBACK;
614 (void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
615
616 if (SvTRUE (ERRSV))
617 croak (NULL);
618 else
619 croak ("FATAL: CCTXT coroutine returned!");
620 }
621 else
622 {
623 UNOP myop;
624
625 PL_op = (OP *)&myop;
626
627 Zero(&myop, 1, UNOP);
628 myop.op_next = Nullop;
629 myop.op_flags = OPf_WANT_VOID;
630
631 PUSHMARK(SP);
632 XPUSHs (sub_init);
633 /*
634 * the next line is slightly wrong, as PL_op->op_next
635 * is actually being executed so we skip the first op.
636 * that doesn't matter, though, since it is only
637 * pp_nextstate and we never return...
638 * ah yes, and I don't care anyways ;)
639 */
640 PUTBACK;
641 PL_op = pp_entersub();
642 SPAGAIN;
643
644 ENTER; /* necessary e.g. for dounwind */
645 }
646}
647
648static void
649continue_coro (void *arg)
650{
651 /*
652 * this is a _very_ stripped down perl interpreter ;)
653 */
654 Coro__State ctx = (Coro__State)arg;
655 JMPENV coro_start_env;
656
657 /* same as JMPENV_BOOTSTRAP */
658 Zero(&coro_start_env, 1, JMPENV);
659 coro_start_env.je_ret = -1;
660 coro_start_env.je_mustcatch = TRUE;
661 PL_top_env = &coro_start_env;
662
663 ctx->cursp = 0;
664 PL_op = PL_op->op_next;
665 CALLRUNOPS(aTHX);
666
667 abort ();
668}
669
670STATIC void
671transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
672{
673 dSTACKLEVEL;
674 static struct coro *xnext;
675
676 if (prev != next)
677 {
678 xnext = next;
679
680 if (next->mainstack)
681 {
682 SAVE (prev, flags);
683 LOAD (next);
684
685 /* mark this state as in-use */
686 next->mainstack = 0;
687 next->tmps_ix = -2;
688
689 /* stacklevel changed? if yes, grab the stack for us! */
690 if (flags & TRANSFER_SAVE_CCTXT)
691 {
692 if (!prev->stack)
693 allocate_stack (prev, 0);
694 else if (prev->cursp != stacklevel
695 && prev->stack->usecnt > 1)
696 {
697 prev->gencnt = ++prev->stack->gencnt;
698 prev->stack->usecnt = 1;
699 }
700
701 /* has our stack been invalidated? */
702 if (next->stack && next->stack->gencnt != next->gencnt)
703 {
704 deallocate_stack (next);
705 allocate_stack (next, 1);
706 coro_create (&(next->stack->cctx),
707 continue_coro, (void *)next,
708 next->stack->sptr, labs (next->stack->ssize));
709 }
710
711 coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
712 /* don't add any code here */
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 /* don't add any code here */
744 }
745 }
746 else
747 setup_coro (next);
748 }
749 }
750
751 /*
752 * xnext is now either prev or next, depending on wether
753 * we switched the c stack or not. that's why i use a global
754 * variable, that should become thread-specific at one point.
755 */
756 xnext->cursp = stacklevel;
757}
758
759static struct coro *
760sv_to_coro (SV *arg, const char *funcname, const char *varname)
761{
762 if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVHV)
763 {
764 HE *he = hv_fetch_ent((HV *)SvRV(arg), ucoro_state_sv, 0, ucoro_state_hash);
765
766 if (!he)
767 croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", funcname, varname);
768
769 arg = HeVAL(he);
770 }
771
772 /* must also be changed inside Coro::Cont::yield */
773 if (SvROK(arg) && SvSTASH(SvRV(arg)) == coro_state_stash)
774 return (struct coro *) SvIV((SV*)SvRV(arg));
775
776 croak ("%s() -- %s is not (and contains not) a Coro::State object", funcname, varname);
777 /*NORETURN*/
778}
779
780static void
781api_transfer(pTHX_ SV *prev, SV *next, int flags)
782{
783 transfer(aTHX_
784 sv_to_coro (prev, "Coro::transfer", "prev"),
785 sv_to_coro (next, "Coro::transfer", "next"),
786 flags);
787}
788 290
789/** Coro ********************************************************************/ 291/** Coro ********************************************************************/
790 292
791#define PRIO_MAX 3 293#define PRIO_MAX 3
792#define PRIO_HIGH 1 294#define PRIO_HIGH 1
… …
794#define PRIO_LOW -1 296#define PRIO_LOW -1
795#define PRIO_IDLE -3 297#define PRIO_IDLE -3
796#define PRIO_MIN -4 298#define PRIO_MIN -4
797 299
798/* for Coro.pm */ 300/* for Coro.pm */
799static GV *coro_current, *coro_idle; 301static SV *coro_current;
302static SV *coro_readyhook;
800static AV *coro_ready[PRIO_MAX-PRIO_MIN+1]; 303static AV *coro_ready [PRIO_MAX - PRIO_MIN + 1];
801static int coro_nready; 304static struct coro *coro_first;
305#define coro_nready coroapi.nready
802 306
803static void 307/** lowlevel stuff **********************************************************/
804coro_enq (SV *sv) 308
309static SV *
310coro_get_sv (pTHX_ const char *name, int create)
805{ 311{
806 if (SvROK (sv)) 312#if PERL_VERSION_ATLEAST (5,10,0)
313 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
314 get_sv (name, create);
315#endif
316 return get_sv (name, create);
317}
318
319static AV *
320coro_get_av (pTHX_ const char *name, int create)
321{
322#if PERL_VERSION_ATLEAST (5,10,0)
323 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
324 get_av (name, create);
325#endif
326 return get_av (name, create);
327}
328
329static HV *
330coro_get_hv (pTHX_ const char *name, int create)
331{
332#if PERL_VERSION_ATLEAST (5,10,0)
333 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
334 get_hv (name, create);
335#endif
336 return get_hv (name, create);
337}
338
339static AV *
340coro_clone_padlist (pTHX_ CV *cv)
341{
342 AV *padlist = CvPADLIST (cv);
343 AV *newpadlist, *newpad;
344
345 newpadlist = newAV ();
346 AvREAL_off (newpadlist);
347#if PERL_VERSION_ATLEAST (5,10,0)
348 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
349#else
350 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
351#endif
352 newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
353 --AvFILLp (padlist);
354
355 av_store (newpadlist, 0, SvREFCNT_inc_NN (*av_fetch (padlist, 0, FALSE)));
356 av_store (newpadlist, 1, (SV *)newpad);
357
358 return newpadlist;
359}
360
361static void
362free_padlist (pTHX_ AV *padlist)
363{
364 /* may be during global destruction */
365 if (SvREFCNT (padlist))
807 { 366 {
808 SV *hv = SvRV (sv); 367 I32 i = AvFILLp (padlist);
809 if (SvTYPE (hv) == SVt_PVHV) 368 while (i >= 0)
810 { 369 {
811 SV **xprio = hv_fetch ((HV *)hv, "prio", 4, 0); 370 SV **svp = av_fetch (padlist, i--, FALSE);
812 int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL; 371 if (svp)
372 {
373 SV *sv;
374 while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
375 SvREFCNT_dec (sv);
813 376
814 prio = prio > PRIO_MAX ? PRIO_MAX 377 SvREFCNT_dec (*svp);
815 : prio < PRIO_MIN ? PRIO_MIN 378 }
816 : prio;
817
818 av_push (coro_ready [prio - PRIO_MIN], sv);
819 coro_nready++;
820
821 return;
822 } 379 }
380
381 SvREFCNT_dec ((SV*)padlist);
382 }
383}
384
385static int
386coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
387{
388 AV *padlist;
389 AV *av = (AV *)mg->mg_obj;
390
391 /* casting is fun. */
392 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
393 free_padlist (aTHX_ padlist);
394
395 SvREFCNT_dec (av); /* sv_magicext increased the refcount */
396
397 return 0;
398}
399
400#define CORO_MAGIC_type_cv PERL_MAGIC_ext
401#define CORO_MAGIC_type_state PERL_MAGIC_ext
402
403static MGVTBL coro_cv_vtbl = {
404 0, 0, 0, 0,
405 coro_cv_free
406};
407
408#define CORO_MAGIC(sv, type) \
409 SvMAGIC (sv) \
410 ? SvMAGIC (sv)->mg_type == type \
411 ? SvMAGIC (sv) \
412 : mg_find (sv, type) \
413 : 0
414
415#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
416#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)
417
418INLINE struct coro *
419SvSTATE_ (pTHX_ SV *coro)
420{
421 HV *stash;
422 MAGIC *mg;
423
424 if (SvROK (coro))
425 coro = SvRV (coro);
426
427 if (expect_false (SvTYPE (coro) != SVt_PVHV))
428 croak ("Coro::State object required");
429
430 stash = SvSTASH (coro);
431 if (expect_false (stash != coro_stash && stash != coro_state_stash))
432 {
433 /* very slow, but rare, check */
434 if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
435 croak ("Coro::State object required");
436 }
437
438 mg = CORO_MAGIC_state (coro);
439 return (struct coro *)mg->mg_ptr;
440}
441
442#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
443
444/* the next two functions merely cache the padlists */
445static void
446get_padlist (pTHX_ CV *cv)
447{
448 MAGIC *mg = CORO_MAGIC_cv (cv);
449 AV *av;
450
451 if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
452 CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
453 else
454 {
455#if CORO_PREFER_PERL_FUNCTIONS
456 /* this is probably cleaner? but also slower! */
457 /* in practise, it seems to be less stable */
458 CV *cp = Perl_cv_clone (cv);
459 CvPADLIST (cv) = CvPADLIST (cp);
460 CvPADLIST (cp) = 0;
461 SvREFCNT_dec (cp);
462#else
463 CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
464#endif
823 } 465 }
466}
824 467
825 croak ("Coro::ready tried to enqueue something that is not a coroutine"); 468static void
469put_padlist (pTHX_ CV *cv)
470{
471 MAGIC *mg = CORO_MAGIC_cv (cv);
472 AV *av;
473
474 if (expect_false (!mg))
475 mg = sv_magicext ((SV *)cv, (SV *)newAV (), CORO_MAGIC_type_cv, &coro_cv_vtbl, 0, 0);
476
477 av = (AV *)mg->mg_obj;
478
479 if (expect_false (AvFILLp (av) >= AvMAX (av)))
480 av_extend (av, AvMAX (av) + 1);
481
482 AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
483}
484
485/** load & save, init *******************************************************/
486
487static void
488load_perl (pTHX_ Coro__State c)
489{
490 perl_slots *slot = c->slot;
491 c->slot = 0;
492
493 PL_mainstack = c->mainstack;
494
495 GvSV (PL_defgv) = slot->defsv;
496 GvAV (PL_defgv) = slot->defav;
497 GvSV (PL_errgv) = slot->errsv;
498 GvSV (irsgv) = slot->irsgv;
499
500 #define VAR(name,type) PL_ ## name = slot->name;
501 # include "state.h"
502 #undef VAR
503
504 {
505 dSP;
506
507 CV *cv;
508
509 /* now do the ugly restore mess */
510 while (expect_true (cv = (CV *)POPs))
511 {
512 put_padlist (aTHX_ cv); /* mark this padlist as available */
513 CvDEPTH (cv) = PTR2IV (POPs);
514 CvPADLIST (cv) = (AV *)POPs;
515 }
516
517 PUTBACK;
518 }
519
520 slf_frame = c->slf_frame;
521}
522
523static void
524save_perl (pTHX_ Coro__State c)
525{
526 c->slf_frame = slf_frame;
527
528 {
529 dSP;
530 I32 cxix = cxstack_ix;
531 PERL_CONTEXT *ccstk = cxstack;
532 PERL_SI *top_si = PL_curstackinfo;
533
534 /*
535 * the worst thing you can imagine happens first - we have to save
536 * (and reinitialize) all cv's in the whole callchain :(
537 */
538
539 XPUSHs (Nullsv);
540 /* this loop was inspired by pp_caller */
541 for (;;)
542 {
543 while (expect_true (cxix >= 0))
544 {
545 PERL_CONTEXT *cx = &ccstk[cxix--];
546
547 if (expect_true (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT))
548 {
549 CV *cv = cx->blk_sub.cv;
550
551 if (expect_true (CvDEPTH (cv)))
552 {
553 EXTEND (SP, 3);
554 PUSHs ((SV *)CvPADLIST (cv));
555 PUSHs (INT2PTR (SV *, (IV)CvDEPTH (cv)));
556 PUSHs ((SV *)cv);
557
558 CvDEPTH (cv) = 0;
559 get_padlist (aTHX_ cv);
560 }
561 }
562 }
563
564 if (expect_true (top_si->si_type == PERLSI_MAIN))
565 break;
566
567 top_si = top_si->si_prev;
568 ccstk = top_si->si_cxstack;
569 cxix = top_si->si_cxix;
570 }
571
572 PUTBACK;
573 }
574
575 /* allocate some space on the context stack for our purposes */
576 /* we manually unroll here, as usually 2 slots is enough */
577 if (SLOT_COUNT >= 1) CXINC;
578 if (SLOT_COUNT >= 2) CXINC;
579 if (SLOT_COUNT >= 3) CXINC;
580 {
581 int i;
582 for (i = 3; i < SLOT_COUNT; ++i)
583 CXINC;
584 }
585 cxstack_ix -= SLOT_COUNT; /* undo allocation */
586
587 c->mainstack = PL_mainstack;
588
589 {
590 perl_slots *slot = c->slot = (perl_slots *)(cxstack + cxstack_ix + 1);
591
592 slot->defav = GvAV (PL_defgv);
593 slot->defsv = DEFSV;
594 slot->errsv = ERRSV;
595 slot->irsgv = GvSV (irsgv);
596
597 #define VAR(name,type) slot->name = PL_ ## name;
598 # include "state.h"
599 #undef VAR
600 }
601}
602
603/*
604 * allocate various perl stacks. This is almost an exact copy
605 * of perl.c:init_stacks, except that it uses less memory
606 * on the (sometimes correct) assumption that coroutines do
607 * not usually need a lot of stackspace.
608 */
609#if CORO_PREFER_PERL_FUNCTIONS
610# define coro_init_stacks init_stacks
611#else
612static void
613coro_init_stacks (pTHX)
614{
615 PL_curstackinfo = new_stackinfo(32, 8);
616 PL_curstackinfo->si_type = PERLSI_MAIN;
617 PL_curstack = PL_curstackinfo->si_stack;
618 PL_mainstack = PL_curstack; /* remember in case we switch stacks */
619
620 PL_stack_base = AvARRAY(PL_curstack);
621 PL_stack_sp = PL_stack_base;
622 PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
623
624 New(50,PL_tmps_stack,32,SV*);
625 PL_tmps_floor = -1;
626 PL_tmps_ix = -1;
627 PL_tmps_max = 32;
628
629 New(54,PL_markstack,16,I32);
630 PL_markstack_ptr = PL_markstack;
631 PL_markstack_max = PL_markstack + 16;
632
633#ifdef SET_MARK_OFFSET
634 SET_MARK_OFFSET;
635#endif
636
637 New(54,PL_scopestack,8,I32);
638 PL_scopestack_ix = 0;
639 PL_scopestack_max = 8;
640
641 New(54,PL_savestack,24,ANY);
642 PL_savestack_ix = 0;
643 PL_savestack_max = 24;
644
645#if !PERL_VERSION_ATLEAST (5,10,0)
646 New(54,PL_retstack,4,OP*);
647 PL_retstack_ix = 0;
648 PL_retstack_max = 4;
649#endif
650}
651#endif
652
653/*
654 * destroy the stacks, the callchain etc...
655 */
656static void
657coro_destruct_stacks (pTHX)
658{
659 while (PL_curstackinfo->si_next)
660 PL_curstackinfo = PL_curstackinfo->si_next;
661
662 while (PL_curstackinfo)
663 {
664 PERL_SI *p = PL_curstackinfo->si_prev;
665
666 if (!IN_DESTRUCT)
667 SvREFCNT_dec (PL_curstackinfo->si_stack);
668
669 Safefree (PL_curstackinfo->si_cxstack);
670 Safefree (PL_curstackinfo);
671 PL_curstackinfo = p;
672 }
673
674 Safefree (PL_tmps_stack);
675 Safefree (PL_markstack);
676 Safefree (PL_scopestack);
677 Safefree (PL_savestack);
678#if !PERL_VERSION_ATLEAST (5,10,0)
679 Safefree (PL_retstack);
680#endif
681}
682
683static size_t
684coro_rss (pTHX_ struct coro *coro)
685{
686 size_t rss = sizeof (*coro);
687
688 if (coro->mainstack)
689 {
690 perl_slots tmp_slot;
691 perl_slots *slot;
692
693 if (coro->flags & CF_RUNNING)
694 {
695 slot = &tmp_slot;
696
697 #define VAR(name,type) slot->name = PL_ ## name;
698 # include "state.h"
699 #undef VAR
700 }
701 else
702 slot = coro->slot;
703
704 if (slot)
705 {
706 rss += sizeof (slot->curstackinfo);
707 rss += (slot->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
708 rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (slot->curstack)) * sizeof (SV *);
709 rss += slot->tmps_max * sizeof (SV *);
710 rss += (slot->markstack_max - slot->markstack_ptr) * sizeof (I32);
711 rss += slot->scopestack_max * sizeof (I32);
712 rss += slot->savestack_max * sizeof (ANY);
713
714#if !PERL_VERSION_ATLEAST (5,10,0)
715 rss += slot->retstack_max * sizeof (OP *);
716#endif
717 }
718 }
719
720 return rss;
721}
722
723/** coroutine stack handling ************************************************/
724
725static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
726static int (*orig_sigelem_set) (pTHX_ SV *sv, MAGIC *mg);
727static int (*orig_sigelem_clr) (pTHX_ SV *sv, MAGIC *mg);
728
729/* apparently < 5.8.8 */
730#ifndef MgPV_nolen_const
731#define MgPV_nolen_const(mg) (((((int)(mg)->mg_len)) == HEf_SVKEY) ? \
732 SvPV_nolen((SV*)((mg)->mg_ptr)) : \
733 (const char*)(mg)->mg_ptr)
734#endif
735
736/*
737 * This overrides the default magic get method of %SIG elements.
738 * The original one doesn't provide for reading back of PL_diehook/PL_warnhook
739 * and instead of tryign to save and restore the hash elements, we just provide
740 * readback here.
741 * We only do this when the hook is != 0, as they are often set to 0 temporarily,
742 * not expecting this to actually change the hook. This is a potential problem
743 * when a schedule happens then, but we ignore this.
744 */
745static int
746coro_sigelem_get (pTHX_ SV *sv, MAGIC *mg)
747{
748 const char *s = MgPV_nolen_const (mg);
749
750 if (*s == '_')
751 {
752 SV **svp = 0;
753
754 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
755 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
756
757 if (svp)
758 {
759 sv_setsv (sv, *svp ? *svp : &PL_sv_undef);
760 return 0;
761 }
762 }
763
764 return orig_sigelem_get ? orig_sigelem_get (aTHX_ sv, mg) : 0;
765}
766
767static int
768coro_sigelem_clr (pTHX_ SV *sv, MAGIC *mg)
769{
770 const char *s = MgPV_nolen_const (mg);
771
772 if (*s == '_')
773 {
774 SV **svp = 0;
775
776 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
777 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
778
779 if (svp)
780 {
781 SV *old = *svp;
782 *svp = 0;
783 SvREFCNT_dec (old);
784 return 0;
785 }
786 }
787
788 return orig_sigelem_clr ? orig_sigelem_clr (aTHX_ sv, mg) : 0;
789}
790
791static int
792coro_sigelem_set (pTHX_ SV *sv, MAGIC *mg)
793{
794 const char *s = MgPV_nolen_const (mg);
795
796 if (*s == '_')
797 {
798 SV **svp = 0;
799
800 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
801 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
802
803 if (svp)
804 {
805 SV *old = *svp;
806 *svp = newSVsv (sv);
807 SvREFCNT_dec (old);
808 return 0;
809 }
810 }
811
812 return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
813}
814
815static void
816prepare_nop (pTHX_ struct coro_transfer_args *ta)
817{
818 /* kind of mega-hacky, but works */
819 ta->next = ta->prev = (struct coro *)ta;
820}
821
822static int
823slf_check_nop (pTHX_ struct CoroSLF *frame)
824{
825 return 0;
826}
827
828static void
829coro_setup (pTHX_ struct coro *coro)
830{
831 /*
832 * emulate part of the perl startup here.
833 */
834 coro_init_stacks (aTHX);
835
836 PL_runops = RUNOPS_DEFAULT;
837 PL_curcop = &PL_compiling;
838 PL_in_eval = EVAL_NULL;
839 PL_comppad = 0;
840 PL_curpm = 0;
841 PL_curpad = 0;
842 PL_localizing = 0;
843 PL_dirty = 0;
844 PL_restartop = 0;
845#if PERL_VERSION_ATLEAST (5,10,0)
846 PL_parser = 0;
847#endif
848
849 /* recreate the die/warn hooks */
850 PL_diehook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__DIE__" , sizeof ("__DIE__" ) - 1, 1), rv_diehook );
851 PL_warnhook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__WARN__", sizeof ("__WARN__") - 1, 1), rv_warnhook);
852
853 GvSV (PL_defgv) = newSV (0);
854 GvAV (PL_defgv) = coro->args; coro->args = 0;
855 GvSV (PL_errgv) = newSV (0);
856 GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
857 PL_rs = newSVsv (GvSV (irsgv));
858 PL_defoutgv = (GV *)SvREFCNT_inc_NN (stdoutgv);
859
860 {
861 dSP;
862 UNOP myop;
863
864 Zero (&myop, 1, UNOP);
865 myop.op_next = Nullop;
866 myop.op_flags = OPf_WANT_VOID;
867
868 PUSHMARK (SP);
869 XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));
870 PUTBACK;
871 PL_op = (OP *)&myop;
872 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
873 SPAGAIN;
874 }
875
876 /* this newly created coroutine might be run on an existing cctx which most
877 * likely was suspended in pp_slf, so we have to emulate entering pp_slf here.
878 */
879 slf_frame.prepare = prepare_nop; /* provide a nop function for an eventual pp_slf */
880 slf_frame.check = slf_check_nop; /* signal pp_slf to not repeat */
881}
882
883static void
884coro_destruct (pTHX_ struct coro *coro)
885{
886 if (!IN_DESTRUCT)
887 {
888 /* restore all saved variables and stuff */
889 LEAVE_SCOPE (0);
890 assert (PL_tmps_floor == -1);
891
892 /* free all temporaries */
893 FREETMPS;
894 assert (PL_tmps_ix == -1);
895
896 /* unwind all extra stacks */
897 POPSTACK_TO (PL_mainstack);
898
899 /* unwind main stack */
900 dounwind (-1);
901 }
902
903 SvREFCNT_dec (GvSV (PL_defgv));
904 SvREFCNT_dec (GvAV (PL_defgv));
905 SvREFCNT_dec (GvSV (PL_errgv));
906 SvREFCNT_dec (PL_defoutgv);
907 SvREFCNT_dec (PL_rs);
908 SvREFCNT_dec (GvSV (irsgv));
909
910 SvREFCNT_dec (PL_diehook);
911 SvREFCNT_dec (PL_warnhook);
912
913 SvREFCNT_dec (coro->saved_deffh);
914 SvREFCNT_dec (coro->throw);
915
916 coro_destruct_stacks (aTHX);
917}
918
919INLINE void
920free_coro_mortal (pTHX)
921{
922 if (expect_true (coro_mortal))
923 {
924 SvREFCNT_dec (coro_mortal);
925 coro_mortal = 0;
926 }
927}
928
929static int
930runops_trace (pTHX)
931{
932 COP *oldcop = 0;
933 int oldcxix = -2;
934 struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */
935 coro_cctx *cctx = coro->cctx;
936
937 while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
938 {
939 PERL_ASYNC_CHECK ();
940
941 if (cctx->flags & CC_TRACE_ALL)
942 {
943 if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
944 {
945 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
946 SV **bot, **top;
947 AV *av = newAV (); /* return values */
948 SV **cb;
949 dSP;
950
951 GV *gv = CvGV (cx->blk_sub.cv);
952 SV *fullname = sv_2mortal (newSV (0));
953 if (isGV (gv))
954 gv_efullname3 (fullname, gv, 0);
955
956 bot = PL_stack_base + cx->blk_oldsp + 1;
957 top = cx->blk_gimme == G_ARRAY ? SP + 1
958 : cx->blk_gimme == G_SCALAR ? bot + 1
959 : bot;
960
961 av_extend (av, top - bot);
962 while (bot < top)
963 av_push (av, SvREFCNT_inc_NN (*bot++));
964
965 PL_runops = RUNOPS_DEFAULT;
966 ENTER;
967 SAVETMPS;
968 EXTEND (SP, 3);
969 PUSHMARK (SP);
970 PUSHs (&PL_sv_no);
971 PUSHs (fullname);
972 PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
973 PUTBACK;
974 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
975 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
976 SPAGAIN;
977 FREETMPS;
978 LEAVE;
979 PL_runops = runops_trace;
980 }
981
982 if (oldcop != PL_curcop)
983 {
984 oldcop = PL_curcop;
985
986 if (PL_curcop != &PL_compiling)
987 {
988 SV **cb;
989
990 if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
991 {
992 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
993
994 if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
995 {
996 runops_proc_t old_runops = PL_runops;
997 dSP;
998 GV *gv = CvGV (cx->blk_sub.cv);
999 SV *fullname = sv_2mortal (newSV (0));
1000
1001 if (isGV (gv))
1002 gv_efullname3 (fullname, gv, 0);
1003
1004 PL_runops = RUNOPS_DEFAULT;
1005 ENTER;
1006 SAVETMPS;
1007 EXTEND (SP, 3);
1008 PUSHMARK (SP);
1009 PUSHs (&PL_sv_yes);
1010 PUSHs (fullname);
1011 PUSHs (CxHASARGS (cx) ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
1012 PUTBACK;
1013 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
1014 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
1015 SPAGAIN;
1016 FREETMPS;
1017 LEAVE;
1018 PL_runops = runops_trace;
1019 }
1020
1021 oldcxix = cxstack_ix;
1022 }
1023
1024 if (cctx->flags & CC_TRACE_LINE)
1025 {
1026 dSP;
1027
1028 PL_runops = RUNOPS_DEFAULT;
1029 ENTER;
1030 SAVETMPS;
1031 EXTEND (SP, 3);
1032 PL_runops = RUNOPS_DEFAULT;
1033 PUSHMARK (SP);
1034 PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
1035 PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
1036 PUTBACK;
1037 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
1038 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
1039 SPAGAIN;
1040 FREETMPS;
1041 LEAVE;
1042 PL_runops = runops_trace;
1043 }
1044 }
1045 }
1046 }
1047 }
1048
1049 TAINT_NOT;
1050 return 0;
1051}
1052
1053static void
1054prepare_set_stacklevel (struct coro_transfer_args *ta, struct coro_cctx *cctx)
1055{
1056 ta->prev = (struct coro *)cctx;
1057 ta->next = 0;
1058}
1059
1060/* inject a fake call to Coro::State::_cctx_init into the execution */
1061/* _cctx_init should be careful, as it could be called at almost any time */
1062/* during execution of a perl program */
1063/* also initialises PL_top_env */
1064static void NOINLINE
1065cctx_prepare (pTHX_ coro_cctx *cctx)
1066{
1067 dSP;
1068 UNOP myop;
1069
1070 PL_top_env = &PL_start_env;
1071
1072 if (cctx->flags & CC_TRACE)
1073 PL_runops = runops_trace;
1074
1075 Zero (&myop, 1, UNOP);
1076 myop.op_next = PL_op;
1077 myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
1078
1079 PUSHMARK (SP);
1080 EXTEND (SP, 2);
1081 PUSHs (sv_2mortal (newSViv ((IV)cctx)));
1082 PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
1083 PUTBACK;
1084 PL_op = (OP *)&myop;
1085 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
1086 SPAGAIN;
1087}
1088
1089/* the tail of transfer: execute stuff we can only do after a transfer */
1090INLINE void
1091transfer_tail (pTHX)
1092{
1093 struct coro *next = (struct coro *)transfer_next;
1094 assert (!(transfer_next = 0)); /* just used for the side effect when asserts are enabled */
1095 assert (("FATAL: next coroutine was zero in transfer_tail (please report)", next));
1096
1097 free_coro_mortal (aTHX);
1098 UNLOCK;
1099
1100 if (expect_false (next->throw))
1101 {
1102 SV *exception = sv_2mortal (next->throw);
1103
1104 next->throw = 0;
1105 sv_setsv (ERRSV, exception);
1106 croak (0);
1107 }
1108}
1109
1110/*
1111 * this is a _very_ stripped down perl interpreter ;)
1112 */
1113static void
1114cctx_run (void *arg)
1115{
1116#ifdef USE_ITHREADS
1117# if CORO_PTHREAD
1118 PERL_SET_CONTEXT (coro_thx);
1119# endif
1120#endif
1121 {
1122 dTHX;
1123
1124 /* normally we would need to skip the entersub here */
1125 /* not doing so will re-execute it, which is exactly what we want */
1126 /* PL_nop = PL_nop->op_next */
1127
1128 /* inject a fake subroutine call to cctx_init */
1129 cctx_prepare (aTHX_ (coro_cctx *)arg);
1130
1131 /* cctx_run is the alternative tail of transfer() */
1132 /* TODO: throwing an exception here might be deadly, VERIFY */
1133 transfer_tail (aTHX);
1134
1135 /* somebody or something will hit me for both perl_run and PL_restartop */
1136 PL_restartop = PL_op;
1137 perl_run (PL_curinterp);
1138
1139 /*
1140 * If perl-run returns we assume exit() was being called or the coro
1141 * fell off the end, which seems to be the only valid (non-bug)
1142 * reason for perl_run to return. We try to exit by jumping to the
1143 * bootstrap-time "top" top_env, as we cannot restore the "main"
1144 * coroutine as Coro has no such concept
1145 */
1146 PL_top_env = main_top_env;
1147 JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
1148 }
1149}
1150
1151static coro_cctx *
1152cctx_new ()
1153{
1154 coro_cctx *cctx;
1155
1156 ++cctx_count;
1157 New (0, cctx, 1, coro_cctx);
1158
1159 cctx->gen = cctx_gen;
1160 cctx->flags = 0;
1161 cctx->idle_sp = 0; /* can be accessed by transfer between cctx_run and set_stacklevel, on throw */
1162
1163 return cctx;
1164}
1165
1166/* create a new cctx only suitable as source */
1167static coro_cctx *
1168cctx_new_empty ()
1169{
1170 coro_cctx *cctx = cctx_new ();
1171
1172 cctx->sptr = 0;
1173 coro_create (&cctx->cctx, 0, 0, 0, 0);
1174
1175 return cctx;
1176}
1177
1178/* create a new cctx suitable as destination/running a perl interpreter */
1179static coro_cctx *
1180cctx_new_run ()
1181{
1182 coro_cctx *cctx = cctx_new ();
1183 void *stack_start;
1184 size_t stack_size;
1185
1186#if HAVE_MMAP
1187 cctx->ssize = ((cctx_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
1188 /* mmap supposedly does allocate-on-write for us */
1189 cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
1190
1191 if (cctx->sptr != (void *)-1)
1192 {
1193 #if CORO_STACKGUARD
1194 mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
1195 #endif
1196 stack_start = (char *)cctx->sptr + CORO_STACKGUARD * PAGESIZE;
1197 stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
1198 cctx->flags |= CC_MAPPED;
1199 }
1200 else
1201#endif
1202 {
1203 cctx->ssize = cctx_stacksize * (long)sizeof (long);
1204 New (0, cctx->sptr, cctx_stacksize, long);
1205
1206 if (!cctx->sptr)
1207 {
1208 perror ("FATAL: unable to allocate stack for coroutine, exiting.");
1209 _exit (EXIT_FAILURE);
1210 }
1211
1212 stack_start = cctx->sptr;
1213 stack_size = cctx->ssize;
1214 }
1215
1216 #if CORO_USE_VALGRIND
1217 cctx->valgrind_id = VALGRIND_STACK_REGISTER ((char *)stack_start, (char *)stack_start + stack_size);
1218 #endif
1219
1220 coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);
1221
1222 return cctx;
1223}
1224
1225static void
1226cctx_destroy (coro_cctx *cctx)
1227{
1228 if (!cctx)
1229 return;
1230
1231 --cctx_count;
1232 coro_destroy (&cctx->cctx);
1233
1234 /* coro_transfer creates new, empty cctx's */
1235 if (cctx->sptr)
1236 {
1237 #if CORO_USE_VALGRIND
1238 VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
1239 #endif
1240
1241#if HAVE_MMAP
1242 if (cctx->flags & CC_MAPPED)
1243 munmap (cctx->sptr, cctx->ssize);
1244 else
1245#endif
1246 Safefree (cctx->sptr);
1247 }
1248
1249 Safefree (cctx);
1250}
1251
1252/* wether this cctx should be destructed */
1253#define CCTX_EXPIRED(cctx) ((cctx)->gen != cctx_gen || ((cctx)->flags & CC_NOREUSE))
1254
1255static coro_cctx *
1256cctx_get (pTHX)
1257{
1258 while (expect_true (cctx_first))
1259 {
1260 coro_cctx *cctx = cctx_first;
1261 cctx_first = cctx->next;
1262 --cctx_idle;
1263
1264 if (expect_true (!CCTX_EXPIRED (cctx)))
1265 return cctx;
1266
1267 cctx_destroy (cctx);
1268 }
1269
1270 return cctx_new_run ();
1271}
1272
1273static void
1274cctx_put (coro_cctx *cctx)
1275{
1276 assert (("FATAL: cctx_put called on non-initialised cctx in Coro (please report)", cctx->sptr));
1277
1278 /* free another cctx if overlimit */
1279 if (expect_false (cctx_idle >= cctx_max_idle))
1280 {
1281 coro_cctx *first = cctx_first;
1282 cctx_first = first->next;
1283 --cctx_idle;
1284
1285 cctx_destroy (first);
1286 }
1287
1288 ++cctx_idle;
1289 cctx->next = cctx_first;
1290 cctx_first = cctx;
1291}
1292
1293/** coroutine switching *****************************************************/
1294
1295static void
1296transfer_check (pTHX_ struct coro *prev, struct coro *next)
1297{
1298 if (expect_true (prev != next))
1299 {
1300 if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
1301 croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states,");
1302
1303 if (expect_false (next->flags & CF_RUNNING))
1304 croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states,");
1305
1306 if (expect_false (next->flags & CF_DESTROYED))
1307 croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states,");
1308
1309#if !PERL_VERSION_ATLEAST (5,10,0)
1310 if (expect_false (PL_lex_state != LEX_NOTPARSING))
1311 croak ("Coro::State::transfer called while parsing, but this is not supported in your perl version,");
1312#endif
1313 }
1314}
1315
1316/* always use the TRANSFER macro */
1317static void NOINLINE
1318transfer (pTHX_ struct coro *prev, struct coro *next, int force_cctx)
1319{
1320 dSTACKLEVEL;
1321
1322 /* sometimes transfer is only called to set idle_sp */
1323 if (expect_false (!next))
1324 {
1325 ((coro_cctx *)prev)->idle_sp = (void *)stacklevel;
1326 assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
1327 }
1328 else if (expect_true (prev != next))
1329 {
1330 coro_cctx *prev__cctx;
1331
1332 if (expect_false (prev->flags & CF_NEW))
1333 {
1334 /* create a new empty/source context */
1335 prev->cctx = cctx_new_empty ();
1336 prev->flags &= ~CF_NEW;
1337 prev->flags |= CF_RUNNING;
1338 }
1339
1340 prev->flags &= ~CF_RUNNING;
1341 next->flags |= CF_RUNNING;
1342
1343 LOCK;
1344
1345 /* first get rid of the old state */
1346 save_perl (aTHX_ prev);
1347
1348 if (expect_false (next->flags & CF_NEW))
1349 {
1350 /* need to start coroutine */
1351 next->flags &= ~CF_NEW;
1352 /* setup coroutine call */
1353 coro_setup (aTHX_ next);
1354 }
1355 else
1356 load_perl (aTHX_ next);
1357
1358 prev__cctx = prev->cctx;
1359
1360 /* possibly untie and reuse the cctx */
1361 if (expect_true (
1362 prev__cctx->idle_sp == (void *)stacklevel
1363 && !(prev__cctx->flags & CC_TRACE)
1364 && !force_cctx
1365 ))
1366 {
1367 /* I assume that stacklevel is a stronger indicator than PL_top_env changes */
1368 assert (("FATAL: current top_env must equal previous top_env in Coro (please report)", PL_top_env == prev__cctx->idle_te));
1369
1370 prev->cctx = 0;
1371
1372 /* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
1373 /* without this the next cctx_get might destroy the prev__cctx while still in use */
1374 if (expect_false (CCTX_EXPIRED (prev__cctx)))
1375 if (!next->cctx)
1376 next->cctx = cctx_get (aTHX);
1377
1378 cctx_put (prev__cctx);
1379 }
1380
1381 ++next->usecount;
1382
1383 if (expect_true (!next->cctx))
1384 next->cctx = cctx_get (aTHX);
1385
1386 assert (("FATAL: transfer_next already nonzero in Coro (please report)", !transfer_next));
1387 transfer_next = next;
1388
1389 if (expect_false (prev__cctx != next->cctx))
1390 {
1391 prev__cctx->top_env = PL_top_env;
1392 PL_top_env = next->cctx->top_env;
1393 coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
1394 }
1395
1396 transfer_tail (aTHX);
1397 }
1398}
1399
1400#define TRANSFER(ta, force_cctx) transfer (aTHX_ (ta).prev, (ta).next, (force_cctx))
1401#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
1402
1403/** high level stuff ********************************************************/
1404
1405static int
1406coro_state_destroy (pTHX_ struct coro *coro)
1407{
1408 if (coro->flags & CF_DESTROYED)
1409 return 0;
1410
1411 coro->flags |= CF_DESTROYED;
1412
1413 if (coro->flags & CF_READY)
1414 {
1415 /* reduce nready, as destroying a ready coro effectively unreadies it */
1416 /* alternative: look through all ready queues and remove the coro */
1417 LOCK;
1418 --coro_nready;
1419 UNLOCK;
1420 }
1421 else
1422 coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
1423
1424 if (coro->mainstack && coro->mainstack != main_mainstack)
1425 {
1426 struct coro temp;
1427
1428 assert (("FATAL: tried to destroy currently running coroutine (please report)", !(coro->flags & CF_RUNNING)));
1429
1430 save_perl (aTHX_ &temp);
1431 load_perl (aTHX_ coro);
1432
1433 coro_destruct (aTHX_ coro);
1434
1435 load_perl (aTHX_ &temp);
1436
1437 coro->slot = 0;
1438 }
1439
1440 cctx_destroy (coro->cctx);
1441 SvREFCNT_dec (coro->args);
1442
1443 if (coro->next) coro->next->prev = coro->prev;
1444 if (coro->prev) coro->prev->next = coro->next;
1445 if (coro == coro_first) coro_first = coro->next;
1446
1447 return 1;
1448}
1449
1450static int
1451coro_state_free (pTHX_ SV *sv, MAGIC *mg)
1452{
1453 struct coro *coro = (struct coro *)mg->mg_ptr;
1454 mg->mg_ptr = 0;
1455
1456 coro->hv = 0;
1457
1458 if (--coro->refcnt < 0)
1459 {
1460 coro_state_destroy (aTHX_ coro);
1461 Safefree (coro);
1462 }
1463
1464 return 0;
1465}
1466
1467static int
1468coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
1469{
1470 struct coro *coro = (struct coro *)mg->mg_ptr;
1471
1472 ++coro->refcnt;
1473
1474 return 0;
1475}
1476
1477static MGVTBL coro_state_vtbl = {
1478 0, 0, 0, 0,
1479 coro_state_free,
1480 0,
1481#ifdef MGf_DUP
1482 coro_state_dup,
1483#else
1484# define MGf_DUP 0
1485#endif
1486};
1487
1488static void
1489prepare_transfer (pTHX_ struct coro_transfer_args *ta, SV *prev_sv, SV *next_sv)
1490{
1491 ta->prev = SvSTATE (prev_sv);
1492 ta->next = SvSTATE (next_sv);
1493 TRANSFER_CHECK (*ta);
1494}
1495
1496static void
1497api_transfer (pTHX_ SV *prev_sv, SV *next_sv)
1498{
1499 struct coro_transfer_args ta;
1500
1501 prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
1502 TRANSFER (ta, 1);
1503}
1504
1505/** Coro ********************************************************************/
1506
1507static void
1508coro_enq (pTHX_ SV *coro_sv)
1509{
1510 av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
826} 1511}
827 1512
828static SV * 1513static SV *
829coro_deq (int min_prio) 1514coro_deq (pTHX)
830{ 1515{
831 int prio = PRIO_MAX - PRIO_MIN; 1516 int prio;
832 1517
833 min_prio -= PRIO_MIN;
834 if (min_prio < 0)
835 min_prio = 0;
836
837 for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; ) 1518 for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
838 if (av_len (coro_ready[prio]) >= 0) 1519 if (AvFILLp (coro_ready [prio]) >= 0)
1520 return av_shift (coro_ready [prio]);
1521
1522 return 0;
1523}
1524
1525static int
1526api_ready (pTHX_ SV *coro_sv)
1527{
1528 struct coro *coro;
1529 SV *sv_hook;
1530 void (*xs_hook)(void);
1531
1532 if (SvROK (coro_sv))
1533 coro_sv = SvRV (coro_sv);
1534
1535 coro = SvSTATE (coro_sv);
1536
1537 if (coro->flags & CF_READY)
1538 return 0;
1539
1540 coro->flags |= CF_READY;
1541
1542 LOCK;
1543
1544 sv_hook = coro_nready ? 0 : coro_readyhook;
1545 xs_hook = coro_nready ? 0 : coroapi.readyhook;
1546
1547 coro_enq (aTHX_ SvREFCNT_inc_NN (coro_sv));
1548 ++coro_nready;
1549
1550 UNLOCK;
1551
1552 if (sv_hook)
1553 {
1554 dSP;
1555
1556 ENTER;
1557 SAVETMPS;
1558
1559 PUSHMARK (SP);
1560 PUTBACK;
1561 call_sv (sv_hook, G_DISCARD);
1562 SPAGAIN;
1563
1564 FREETMPS;
1565 LEAVE;
1566 }
1567
1568 if (xs_hook)
1569 xs_hook ();
1570
1571 return 1;
1572}
1573
1574static int
1575api_is_ready (pTHX_ SV *coro_sv)
1576{
1577 return !!(SvSTATE (coro_sv)->flags & CF_READY);
1578}
1579
1580INLINE void
1581prepare_schedule (pTHX_ struct coro_transfer_args *ta)
1582{
1583 SV *prev_sv, *next_sv;
1584
1585 for (;;)
1586 {
1587 LOCK;
1588 next_sv = coro_deq (aTHX);
1589
1590 /* nothing to schedule: call the idle handler */
1591 if (expect_false (!next_sv))
1592 {
1593 dSP;
1594 UNLOCK;
1595
1596 ENTER;
1597 SAVETMPS;
1598
1599 PUSHMARK (SP);
1600 PUTBACK;
1601 call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
1602 SPAGAIN;
1603
1604 FREETMPS;
1605 LEAVE;
1606 continue;
1607 }
1608
1609 ta->next = SvSTATE (next_sv);
1610
1611 /* cannot transfer to destroyed coros, skip and look for next */
1612 if (expect_false (ta->next->flags & CF_DESTROYED))
1613 {
1614 UNLOCK;
1615 SvREFCNT_dec (next_sv);
1616 /* coro_nready has already been taken care of by destroy */
1617 continue;
1618 }
1619
1620 --coro_nready;
1621 UNLOCK;
1622 break;
1623 }
1624
1625 /* free this only after the transfer */
1626 prev_sv = SvRV (coro_current);
1627 ta->prev = SvSTATE (prev_sv);
1628 TRANSFER_CHECK (*ta);
1629 assert (("FATAL: next coroutine isn't marked as ready in Coro (please report)", ta->next->flags & CF_READY));
1630 ta->next->flags &= ~CF_READY;
1631 SvRV_set (coro_current, next_sv);
1632
1633 LOCK;
1634 free_coro_mortal (aTHX);
1635 coro_mortal = prev_sv;
1636 UNLOCK;
1637}
1638
1639INLINE void
1640prepare_cede (pTHX_ struct coro_transfer_args *ta)
1641{
1642 api_ready (aTHX_ coro_current);
1643 prepare_schedule (aTHX_ ta);
1644}
1645
1646INLINE void
1647prepare_cede_notself (pTHX_ struct coro_transfer_args *ta)
1648{
1649 SV *prev = SvRV (coro_current);
1650
1651 if (coro_nready)
1652 {
1653 prepare_schedule (aTHX_ ta);
1654 api_ready (aTHX_ prev);
1655 }
1656 else
1657 prepare_nop (aTHX_ ta);
1658}
1659
1660static void
1661api_schedule (pTHX)
1662{
1663 struct coro_transfer_args ta;
1664
1665 prepare_schedule (aTHX_ &ta);
1666 TRANSFER (ta, 1);
1667}
1668
1669static int
1670api_cede (pTHX)
1671{
1672 struct coro_transfer_args ta;
1673
1674 prepare_cede (aTHX_ &ta);
1675
1676 if (expect_true (ta.prev != ta.next))
1677 {
1678 TRANSFER (ta, 1);
1679 return 1;
1680 }
1681 else
1682 return 0;
1683}
1684
1685static int
1686api_cede_notself (pTHX)
1687{
1688 if (coro_nready)
1689 {
1690 struct coro_transfer_args ta;
1691
1692 prepare_cede_notself (aTHX_ &ta);
1693 TRANSFER (ta, 1);
1694 return 1;
1695 }
1696 else
1697 return 0;
1698}
1699
1700static void
1701api_trace (pTHX_ SV *coro_sv, int flags)
1702{
1703 struct coro *coro = SvSTATE (coro_sv);
1704
1705 if (flags & CC_TRACE)
1706 {
1707 if (!coro->cctx)
1708 coro->cctx = cctx_new_run ();
1709 else if (!(coro->cctx->flags & CC_TRACE))
1710 croak ("cannot enable tracing on coroutine with custom stack,");
1711
1712 coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
1713 }
1714 else if (coro->cctx && coro->cctx->flags & CC_TRACE)
1715 {
1716 coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
1717
1718 if (coro->flags & CF_RUNNING)
1719 PL_runops = RUNOPS_DEFAULT;
1720 else
1721 coro->slot->runops = RUNOPS_DEFAULT;
1722 }
1723}
1724
1725/*****************************************************************************/
1726/* PerlIO::cede */
1727
1728typedef struct
1729{
1730 PerlIOBuf base;
1731 NV next, every;
1732} PerlIOCede;
1733
1734static IV
1735PerlIOCede_pushed (pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
1736{
1737 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
1738
1739 self->every = SvCUR (arg) ? SvNV (arg) : 0.01;
1740 self->next = nvtime () + self->every;
1741
1742 return PerlIOBuf_pushed (aTHX_ f, mode, Nullsv, tab);
1743}
1744
1745static SV *
1746PerlIOCede_getarg (pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
1747{
1748 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
1749
1750 return newSVnv (self->every);
1751}
1752
1753static IV
1754PerlIOCede_flush (pTHX_ PerlIO *f)
1755{
1756 PerlIOCede *self = PerlIOSelf (f, PerlIOCede);
1757 double now = nvtime ();
1758
1759 if (now >= self->next)
1760 {
1761 api_cede (aTHX);
1762 self->next = now + self->every;
1763 }
1764
1765 return PerlIOBuf_flush (aTHX_ f);
1766}
1767
1768static PerlIO_funcs PerlIO_cede =
1769{
1770 sizeof(PerlIO_funcs),
1771 "cede",
1772 sizeof(PerlIOCede),
1773 PERLIO_K_DESTRUCT | PERLIO_K_RAW,
1774 PerlIOCede_pushed,
1775 PerlIOBuf_popped,
1776 PerlIOBuf_open,
1777 PerlIOBase_binmode,
1778 PerlIOCede_getarg,
1779 PerlIOBase_fileno,
1780 PerlIOBuf_dup,
1781 PerlIOBuf_read,
1782 PerlIOBuf_unread,
1783 PerlIOBuf_write,
1784 PerlIOBuf_seek,
1785 PerlIOBuf_tell,
1786 PerlIOBuf_close,
1787 PerlIOCede_flush,
1788 PerlIOBuf_fill,
1789 PerlIOBase_eof,
1790 PerlIOBase_error,
1791 PerlIOBase_clearerr,
1792 PerlIOBase_setlinebuf,
1793 PerlIOBuf_get_base,
1794 PerlIOBuf_bufsiz,
1795 PerlIOBuf_get_ptr,
1796 PerlIOBuf_get_cnt,
1797 PerlIOBuf_set_ptrcnt,
1798};
1799
1800/*****************************************************************************/
1801
1802static const CV *slf_cv; /* for quick consistency check */
1803
1804static UNOP slf_restore; /* restore stack as entersub did, for first-re-run */
1805static SV *slf_arg0;
1806static SV *slf_arg1;
1807static SV *slf_arg2;
1808
1809/* this restores the stack in the case we patched the entersub, to */
1810/* recreate the stack frame as perl will on following calls */
1811/* since entersub cleared the stack */
1812static OP *
1813pp_restore (pTHX)
1814{
1815 dSP;
1816
1817 PUSHMARK (SP);
1818
1819 EXTEND (SP, 3);
1820 if (slf_arg0) PUSHs (sv_2mortal (slf_arg0));
1821 if (slf_arg1) PUSHs (sv_2mortal (slf_arg1));
1822 if (slf_arg2) PUSHs (sv_2mortal (slf_arg2));
1823 PUSHs ((SV *)CvGV (slf_cv));
1824
1825 RETURNOP (slf_restore.op_first);
1826}
1827
1828static void
1829slf_prepare_set_stacklevel (pTHX_ struct coro_transfer_args *ta)
1830{
1831 prepare_set_stacklevel (ta, (struct coro_cctx *)slf_frame.data);
1832}
1833
1834static void
1835slf_init_set_stacklevel (pTHX_ struct CoroSLF *frame, SV **arg, int items)
1836{
1837 assert (("FATAL: set_stacklevel needs the coro cctx as sole argument", items == 1));
1838
1839 frame->prepare = slf_prepare_set_stacklevel;
1840 frame->check = slf_check_nop;
1841 frame->data = (void *)SvIV (arg [0]);
1842}
1843
1844static void
1845slf_prepare_transfer (pTHX_ struct coro_transfer_args *ta)
1846{
1847 SV **arg = (SV **)slf_frame.data;
1848
1849 prepare_transfer (aTHX_ ta, arg [0], arg [1]);
1850}
1851
1852static void
1853slf_init_transfer (pTHX_ struct CoroSLF *frame, SV **arg, int items)
1854{
1855 if (items != 2)
1856 croak ("Coro::State::transfer (prev, next) expects two arguments, not %d,", items);
1857
1858 frame->prepare = slf_prepare_transfer;
1859 frame->check = slf_check_nop;
1860 frame->data = (void *)arg; /* let's hope it will stay valid */
1861}
1862
1863static void
1864slf_init_schedule (pTHX_ struct CoroSLF *frame, SV **arg, int items)
1865{
1866 frame->prepare = prepare_schedule;
1867 frame->check = slf_check_nop;
1868}
1869
1870static void
1871slf_init_cede (pTHX_ struct CoroSLF *frame, SV **arg, int items)
1872{
1873 frame->prepare = prepare_cede;
1874 frame->check = slf_check_nop;
1875}
1876
1877static void
1878slf_init_cede_notself (pTHX_ struct CoroSLF *frame, SV **arg, int items)
1879{
1880 frame->prepare = prepare_cede_notself;
1881 frame->check = slf_check_nop;
1882}
1883
1884/* we hijack an hopefully unused CV flag for our purposes */
1885#define CVf_SLF 0x4000
1886
1887/*
1888 * these not obviously related functions are all rolled into one
1889 * function to increase chances that they all will call transfer with the same
1890 * stack offset
1891 * SLF stands for "schedule-like-function".
1892 */
1893static OP *
1894pp_slf (pTHX)
1895{
1896 I32 checkmark; /* mark SP to see how many elements check has pushed */
1897
1898 /* set up the slf frame, unless it has already been set-up */
1899 /* the latter happens when a new coro has been started */
1900 /* or when a new cctx was attached to an existing coroutine */
1901 if (expect_true (!slf_frame.prepare))
1902 {
1903 /* first iteration */
1904 dSP;
1905 SV **arg = PL_stack_base + TOPMARK + 1;
1906 int items = SP - arg; /* args without function object */
1907 SV *gv = *sp;
1908
1909 /* do a quick consistency check on the "function" object, and if it isn't */
1910 /* for us, divert to the real entersub */
1911 if (SvTYPE (gv) != SVt_PVGV || !(CvFLAGS (GvCV (gv)) & CVf_SLF))
1912 return PL_ppaddr[OP_ENTERSUB](aTHX);
1913
1914 /* pop args */
1915 SP = PL_stack_base + POPMARK;
1916
1917 if (!(PL_op->op_flags & OPf_STACKED))
1918 {
1919 /* ampersand-form of call, use @_ instead of stack */
1920 AV *av = GvAV (PL_defgv);
1921 arg = AvARRAY (av);
1922 items = AvFILLp (av) + 1;
1923 }
1924
1925 PUTBACK;
1926
1927 ((coro_slf_cb)CvXSUBANY (GvCV (gv)).any_ptr) (aTHX_ &slf_frame, arg, items);
1928 }
1929
1930 /* now interpret the slf_frame */
1931 /* we use a callback system not to make the code needlessly */
1932 /* complicated, but so we can run multiple perl coros from one cctx */
1933
1934 do
1935 {
1936 struct coro_transfer_args ta;
1937
1938 slf_frame.prepare (aTHX_ &ta);
1939 TRANSFER (ta, 0);
1940
1941 checkmark = PL_stack_sp - PL_stack_base;
1942 }
1943 while (slf_frame.check (aTHX_ &slf_frame));
1944
1945 {
1946 dSP;
1947 SV **bot = PL_stack_base + checkmark;
1948 int gimme = GIMME_V;
1949
1950 slf_frame.prepare = 0; /* signal pp_slf that we need a new frame */
1951
1952 /* make sure we put something on the stack in scalar context */
1953 if (gimme == G_SCALAR)
839 { 1954 {
840 coro_nready--; 1955 if (sp == bot)
841 return av_shift (coro_ready[prio]); 1956 XPUSHs (&PL_sv_undef);
1957
1958 SP = bot + 1;
842 } 1959 }
843 1960
1961 PUTBACK;
1962 }
1963
1964 return NORMAL;
1965}
1966
1967static void
1968api_execute_slf (pTHX_ CV *cv, coro_slf_cb init_cb, SV **arg, int items)
1969{
1970 assert (("FATAL: SLF call with illegal CV value", !CvANON (cv)));
1971
1972 if (PL_op->op_ppaddr != PL_ppaddr [OP_ENTERSUB]
1973 && PL_op->op_ppaddr != pp_slf)
1974 croak ("FATAL: Coro SLF calls can only be made normally, not via goto or any other means, caught");
1975
1976 if (items > 3)
1977 croak ("Coro only supports up to three arguments to SLF functions currently (not %d), caught", items);
1978
1979 CvFLAGS (cv) |= CVf_SLF;
1980 CvXSUBANY (cv).any_ptr = (void *)init_cb;
1981 slf_cv = cv;
1982
1983 /* we patch the op, and then re-run the whole call */
1984 /* we have to put the same argument on the stack for this to work */
1985 /* and this will be done by pp_restore */
1986 slf_restore.op_next = (OP *)&slf_restore;
1987 slf_restore.op_type = OP_NULL;
1988 slf_restore.op_ppaddr = pp_restore;
1989 slf_restore.op_first = PL_op;
1990
1991 slf_arg0 = items > 0 ? SvREFCNT_inc (arg [0]) : 0;
1992 slf_arg1 = items > 1 ? SvREFCNT_inc (arg [1]) : 0;
1993 slf_arg2 = items > 2 ? SvREFCNT_inc (arg [2]) : 0;
1994
1995 PL_op->op_ppaddr = pp_slf;
1996
1997 PL_op = (OP *)&slf_restore;
1998}
1999
2000/*****************************************************************************/
2001
2002static int
2003slf_check_semaphore_down (pTHX_ struct CoroSLF *frame)
2004{
2005 AV *av = (AV *)frame->data;
2006 SV *count_sv = AvARRAY (av)[0];
2007
2008 if (SvIVX (count_sv) > 0)
2009 {
2010 SvIVX (count_sv) = SvIVX (count_sv) - 1;
844 return 0; 2011 return 0;
845} 2012 }
2013 else
2014 {
2015 int i;
2016 /* if we were woken up but can't down, we look through the whole */
2017 /* waiters list and only add us if we aren't in there already */
2018 /* this avoids some degenerate memory usage cases */
846 2019
847static void 2020 for (i = 1; i <= AvFILLp (av); ++i)
848api_ready (SV *coro) 2021 if (AvARRAY (av)[i] == SvRV (coro_current))
849{ 2022 return 1;
850 coro_enq (SvREFCNT_inc (coro));
851}
852 2023
853static void 2024 av_push (av, SvREFCNT_inc (SvRV (coro_current)));
854api_schedule (int cede) 2025 return 1;
855{ 2026 }
856 SV *prev, *next;
857
858 prev = GvSV (coro_current);
859
860 if (cede)
861 coro_enq (SvREFCNT_inc (prev));
862
863 next = coro_deq (PRIO_MIN);
864
865 if (!next)
866 next = SvREFCNT_inc (GvSV (coro_idle));
867
868 GvSV (coro_current) = SvREFCNT_inc (next);
869 transfer (aTHX_
870 sv_to_coro (prev, "Coro::schedule", "current coroutine"),
871 sv_to_coro (next, "Coro::schedule", "next coroutine"),
872 TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
873 SvREFCNT_dec (next);
874 SvREFCNT_dec (prev);
875} 2027}
876 2028
2029static void
2030slf_init_semaphore_down (pTHX_ struct CoroSLF *frame, SV **arg, int items)
2031{
2032 AV *av = (AV *)SvRV (arg [0]);
2033
2034 if (SvIVX (AvARRAY (av)[0]) > 0)
2035 {
2036 frame->data = (void *)av;
2037 frame->prepare = prepare_nop;
2038 }
2039 else
2040 {
2041 av_push (av, SvREFCNT_inc (SvRV (coro_current)));
2042
2043 frame->data = (void *)sv_2mortal (SvREFCNT_inc ((SV *)av));
2044 frame->prepare = prepare_schedule;
2045 }
2046
2047 frame->check = slf_check_semaphore_down;
2048
2049}
2050
2051/*****************************************************************************/
2052
2053#define GENSUB_ARG CvXSUBANY (cv).any_ptr
2054
2055/* create a closure from XS, returns a code reference */
2056/* the arg can be accessed via GENSUB_ARG from the callback */
2057/* the callback must use dXSARGS/XSRETURN */
2058static SV *
2059gensub (pTHX_ void (*xsub)(pTHX_ CV *), void *arg)
2060{
2061 CV *cv = (CV *)NEWSV (0, 0);
2062
2063 sv_upgrade ((SV *)cv, SVt_PVCV);
2064
2065 CvANON_on (cv);
2066 CvISXSUB_on (cv);
2067 CvXSUB (cv) = xsub;
2068 GENSUB_ARG = arg;
2069
2070 return newRV_noinc ((SV *)cv);
2071}
2072
2073/*****************************************************************************/
2074
877MODULE = Coro::State PACKAGE = Coro::State 2075MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
878 2076
879PROTOTYPES: ENABLE 2077PROTOTYPES: DISABLE
880 2078
881BOOT: 2079BOOT:
882{ /* {} necessary for stoopid perl-5.6.x */ 2080{
883 ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1); 2081#ifdef USE_ITHREADS
884 PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1); 2082 MUTEX_INIT (&coro_lock);
2083# if CORO_PTHREAD
2084 coro_thx = PERL_GET_CONTEXT;
2085# endif
2086#endif
2087 BOOT_PAGESIZE;
2088
2089 irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
2090 stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
2091
2092 orig_sigelem_get = PL_vtbl_sigelem.svt_get; PL_vtbl_sigelem.svt_get = coro_sigelem_get;
2093 orig_sigelem_set = PL_vtbl_sigelem.svt_set; PL_vtbl_sigelem.svt_set = coro_sigelem_set;
2094 orig_sigelem_clr = PL_vtbl_sigelem.svt_clear; PL_vtbl_sigelem.svt_clear = coro_sigelem_clr;
2095
2096 hv_sig = coro_get_hv (aTHX_ "SIG", TRUE);
2097 rv_diehook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::diehook" , 0, SVt_PVCV));
2098 rv_warnhook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::warnhook", 0, SVt_PVCV));
2099
885 coro_state_stash = gv_stashpv ("Coro::State", TRUE); 2100 coro_state_stash = gv_stashpv ("Coro::State", TRUE);
886 2101
887 newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV)); 2102 newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
888 newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV)); 2103 newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
889 newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV)); 2104 newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
890 newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT)); 2105 newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
891
892 if (!padlist_cache)
893 padlist_cache = newHV ();
894 2106
895 main_mainstack = PL_mainstack; 2107 main_mainstack = PL_mainstack;
2108 main_top_env = PL_top_env;
896 2109
2110 while (main_top_env->je_prev)
2111 main_top_env = main_top_env->je_prev;
2112
897 coroapi.ver = CORO_API_VERSION; 2113 coroapi.ver = CORO_API_VERSION;
2114 coroapi.rev = CORO_API_REVISION;
2115
898 coroapi.transfer = api_transfer; 2116 coroapi.transfer = api_transfer;
899}
900 2117
901Coro::State 2118 coroapi.sv_state = SvSTATE_;
902_newprocess(args) 2119 coroapi.execute_slf = api_execute_slf;
903 SV * args 2120 coroapi.prepare_nop = prepare_nop;
904 PROTOTYPE: $ 2121 coroapi.prepare_schedule = prepare_schedule;
2122 coroapi.prepare_cede = prepare_cede;
2123 coroapi.prepare_cede_notself = prepare_cede_notself;
2124
2125 {
2126 SV **svp = hv_fetch (PL_modglobal, "Time::NVtime", 12, 0);
2127
2128 if (!svp) croak ("Time::HiRes is required");
2129 if (!SvIOK (*svp)) croak ("Time::NVtime isn't a function pointer");
2130
2131 nvtime = INT2PTR (double (*)(), SvIV (*svp));
2132 }
2133
2134 assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
2135}
2136
2137SV *
2138new (char *klass, ...)
905 CODE: 2139 CODE:
906 Coro__State coro; 2140{
2141 struct coro *coro;
2142 MAGIC *mg;
2143 HV *hv;
2144 int i;
907 2145
908 if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
909 croak ("Coro::State::_newprocess expects an arrayref");
910
911 New (0, coro, 1, struct coro); 2146 Newz (0, coro, 1, struct coro);
2147 coro->args = newAV ();
2148 coro->flags = CF_NEW;
912 2149
913 coro->args = (AV *)SvREFCNT_inc (SvRV (args)); 2150 if (coro_first) coro_first->prev = coro;
914 coro->mainstack = 0; /* actual work is done inside transfer */ 2151 coro->next = coro_first;
915 coro->stack = 0; 2152 coro_first = coro;
916 2153
917 RETVAL = coro; 2154 coro->hv = hv = newHV ();
2155 mg = sv_magicext ((SV *)hv, 0, CORO_MAGIC_type_state, &coro_state_vtbl, (char *)coro, 0);
2156 mg->mg_flags |= MGf_DUP;
2157 RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
2158
2159 av_extend (coro->args, items - 1);
2160 for (i = 1; i < items; i++)
2161 av_push (coro->args, newSVsv (ST (i)));
2162}
918 OUTPUT: 2163 OUTPUT:
919 RETVAL 2164 RETVAL
920 2165
921void 2166void
922transfer(prev, next, flags) 2167_set_stacklevel (...)
923 Coro::State_or_hashref prev 2168 CODE:
924 Coro::State_or_hashref next 2169 api_execute_slf (aTHX_ cv, slf_init_set_stacklevel, &ST (0), items);
925 int flags
926 PROTOTYPE: @
927 CODE:
928 PUTBACK;
929 transfer (aTHX_ prev, next, flags);
930 SPAGAIN;
931 2170
932void 2171void
933DESTROY(coro) 2172transfer (...)
934 Coro::State coro 2173 PROTOTYPE: $$
935 CODE: 2174 CODE:
2175 api_execute_slf (aTHX_ cv, slf_init_transfer, &ST (0), items);
936 2176
937 if (coro->mainstack && coro->mainstack != main_mainstack) 2177bool
2178_destroy (SV *coro_sv)
2179 CODE:
2180 RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
2181 OUTPUT:
2182 RETVAL
2183
2184void
2185_exit (int code)
2186 PROTOTYPE: $
2187 CODE:
2188 _exit (code);
2189
2190int
2191cctx_stacksize (int new_stacksize = 0)
2192 PROTOTYPE: ;$
2193 CODE:
2194 RETVAL = cctx_stacksize;
2195 if (new_stacksize)
2196 {
2197 cctx_stacksize = new_stacksize;
2198 ++cctx_gen;
2199 }
2200 OUTPUT:
2201 RETVAL
2202
2203int
2204cctx_max_idle (int max_idle = 0)
2205 PROTOTYPE: ;$
2206 CODE:
2207 RETVAL = cctx_max_idle;
2208 if (max_idle > 1)
2209 cctx_max_idle = max_idle;
2210 OUTPUT:
2211 RETVAL
2212
2213int
2214cctx_count ()
2215 PROTOTYPE:
2216 CODE:
2217 RETVAL = cctx_count;
2218 OUTPUT:
2219 RETVAL
2220
2221int
2222cctx_idle ()
2223 PROTOTYPE:
2224 CODE:
2225 RETVAL = cctx_idle;
2226 OUTPUT:
2227 RETVAL
2228
2229void
2230list ()
2231 PROTOTYPE:
2232 PPCODE:
2233{
2234 struct coro *coro;
2235 for (coro = coro_first; coro; coro = coro->next)
2236 if (coro->hv)
2237 XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
2238}
2239
2240void
2241call (Coro::State coro, SV *coderef)
2242 ALIAS:
2243 eval = 1
2244 CODE:
2245{
2246 if (coro->mainstack && ((coro->flags & CF_RUNNING) || coro->slot))
938 { 2247 {
939 struct coro temp; 2248 struct coro temp;
940 2249
2250 if (!(coro->flags & CF_RUNNING))
2251 {
2252 PUTBACK;
2253 save_perl (aTHX_ &temp);
2254 load_perl (aTHX_ coro);
2255 }
2256
2257 {
2258 dSP;
2259 ENTER;
2260 SAVETMPS;
941 PUTBACK; 2261 PUTBACK;
942 SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL); 2262 PUSHSTACK;
943 LOAD(aTHX_ coro); 2263 PUSHMARK (SP);
2264
2265 if (ix)
2266 eval_sv (coderef, 0);
2267 else
2268 call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
2269
2270 POPSTACK;
944 SPAGAIN; 2271 SPAGAIN;
2272 FREETMPS;
2273 LEAVE;
2274 PUTBACK;
2275 }
945 2276
946 destroy_stacks (aTHX); 2277 if (!(coro->flags & CF_RUNNING))
947 2278 {
948 LOAD((&temp)); /* this will get rid of defsv etc.. */ 2279 save_perl (aTHX_ coro);
2280 load_perl (aTHX_ &temp);
949 SPAGAIN; 2281 SPAGAIN;
950 2282 }
951 coro->mainstack = 0;
952 } 2283 }
2284}
953 2285
954 deallocate_stack (coro); 2286SV *
955 2287is_ready (Coro::State coro)
956 Safefree (coro); 2288 PROTOTYPE: $
2289 ALIAS:
2290 is_ready = CF_READY
2291 is_running = CF_RUNNING
2292 is_new = CF_NEW
2293 is_destroyed = CF_DESTROYED
2294 CODE:
2295 RETVAL = boolSV (coro->flags & ix);
2296 OUTPUT:
2297 RETVAL
957 2298
958void 2299void
959flush() 2300throw (Coro::State self, SV *throw = &PL_sv_undef)
960 CODE: 2301 PROTOTYPE: $;$
961#ifdef MAY_FLUSH 2302 CODE:
962 flush_padlist_cache (); 2303 SvREFCNT_dec (self->throw);
963#endif 2304 self->throw = SvOK (throw) ? newSVsv (throw) : 0;
964 2305
965void 2306void
966_exit(code) 2307api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
967 int code 2308 PROTOTYPE: $;$
2309 C_ARGS: aTHX_ coro, flags
2310
2311SV *
2312has_cctx (Coro::State coro)
968 PROTOTYPE: $ 2313 PROTOTYPE: $
969 CODE: 2314 CODE:
970#if defined(__GLIBC__) || _POSIX_C_SOURCE 2315 RETVAL = boolSV (!!coro->cctx);
971 _exit (code); 2316 OUTPUT:
972#else 2317 RETVAL
973 signal (SIGTERM, SIG_DFL);
974 raise (SIGTERM);
975 exit (code);
976#endif
977 2318
978MODULE = Coro::State PACKAGE = Coro::Cont 2319int
2320is_traced (Coro::State coro)
2321 PROTOTYPE: $
2322 CODE:
2323 RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
2324 OUTPUT:
2325 RETVAL
979 2326
980# this is slightly dirty (should expose a c-level api) 2327UV
2328rss (Coro::State coro)
2329 PROTOTYPE: $
2330 ALIAS:
2331 usecount = 1
2332 CODE:
2333 switch (ix)
2334 {
2335 case 0: RETVAL = coro_rss (aTHX_ coro); break;
2336 case 1: RETVAL = coro->usecount; break;
2337 }
2338 OUTPUT:
2339 RETVAL
981 2340
982void 2341void
983yield(...) 2342force_cctx ()
2343 PROTOTYPE:
2344 CODE:
2345 struct coro *coro = SvSTATE (coro_current);
2346 coro->cctx->idle_sp = 0;
2347
2348void
2349swap_defsv (Coro::State self)
984 PROTOTYPE: @ 2350 PROTOTYPE: $
2351 ALIAS:
2352 swap_defav = 1
985 CODE: 2353 CODE:
986 static SV *returnstk; 2354 if (!self->slot)
987 SV *sv; 2355 croak ("cannot swap state with coroutine that has no saved state,");
988 AV *defav = GvAV (PL_defgv); 2356 else
989 struct coro *prev, *next; 2357 {
2358 SV **src = ix ? (SV **)&GvAV (PL_defgv) : &GvSV (PL_defgv);
2359 SV **dst = ix ? (SV **)&self->slot->defav : (SV **)&self->slot->defsv;
990 2360
991 if (!returnstk) 2361 SV *tmp = *src; *src = *dst; *dst = tmp;
992 returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE)); 2362 }
993
994 /* set up @_ -- ugly */
995 av_clear (defav);
996 av_fill (defav, items - 1);
997 while (items--)
998 av_store (defav, items, SvREFCNT_inc (ST(items)));
999
1000 mg_get (returnstk); /* isn't documentation wrong for mg_get? */
1001 sv = av_pop ((AV *)SvRV (returnstk));
1002 prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
1003 next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
1004 SvREFCNT_dec (sv);
1005
1006 transfer(aTHX_ prev, next, 0);
1007 2363
1008MODULE = Coro::State PACKAGE = Coro 2364MODULE = Coro::State PACKAGE = Coro
1009 2365
1010# this is slightly dirty (should expose a c-level api)
1011
1012BOOT: 2366BOOT:
1013{ 2367{
1014 int i; 2368 int i;
2369
2370 av_async_pool = coro_get_av (aTHX_ "Coro::async_pool", TRUE);
2371 sv_pool_rss = coro_get_sv (aTHX_ "Coro::POOL_RSS" , TRUE);
2372 sv_pool_size = coro_get_sv (aTHX_ "Coro::POOL_SIZE" , TRUE);
2373
2374 coro_current = coro_get_sv (aTHX_ "Coro::current", FALSE);
2375 SvREADONLY_on (coro_current);
2376
1015 HV *stash = gv_stashpv ("Coro", TRUE); 2377 coro_stash = gv_stashpv ("Coro", TRUE);
1016 2378
1017 newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX)); 2379 newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1018 newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH)); 2380 newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1019 newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL)); 2381 newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1020 newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW)); 2382 newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1021 newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE)); 2383 newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1022 newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN)); 2384 newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1023
1024 coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1025 coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1026 2385
1027 for (i = PRIO_MAX - PRIO_MIN + 1; i--; ) 2386 for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1028 coro_ready[i] = newAV (); 2387 coro_ready[i] = newAV ();
1029 2388
1030 { 2389 {
1031 SV *sv = perl_get_sv("Coro::API", 1); 2390 SV *sv = coro_get_sv (aTHX_ "Coro::API", TRUE);
1032 2391
1033 coroapi.schedule = api_schedule; 2392 coroapi.schedule = api_schedule;
2393 coroapi.cede = api_cede;
2394 coroapi.cede_notself = api_cede_notself;
1034 coroapi.ready = api_ready; 2395 coroapi.ready = api_ready;
2396 coroapi.is_ready = api_is_ready;
1035 coroapi.nready = &coro_nready; 2397 coroapi.nready = coro_nready;
1036 coroapi.current = coro_current; 2398 coroapi.current = coro_current;
1037 2399
1038 GCoroAPI = &coroapi; 2400 GCoroAPI = &coroapi;
1039 sv_setiv(sv, (IV)&coroapi); 2401 sv_setiv (sv, (IV)&coroapi);
1040 SvREADONLY_on(sv); 2402 SvREADONLY_on (sv);
1041 } 2403 }
1042} 2404}
1043 2405
1044void 2406void
1045ready(self) 2407schedule (...)
1046 SV * self
1047 CODE: 2408 CODE:
1048 api_ready (self); 2409 api_execute_slf (aTHX_ cv, slf_init_schedule, &ST (0), 0);
2410
2411void
2412cede (...)
2413 CODE:
2414 api_execute_slf (aTHX_ cv, slf_init_cede, &ST (0), 0);
2415
2416void
2417cede_notself (...)
2418 CODE:
2419 api_execute_slf (aTHX_ cv, slf_init_cede_notself, &ST (0), 0);
2420
2421void
2422_set_current (SV *current)
2423 PROTOTYPE: $
2424 CODE:
2425 SvREFCNT_dec (SvRV (coro_current));
2426 SvRV_set (coro_current, SvREFCNT_inc_NN (SvRV (current)));
2427
2428void
2429_set_readyhook (SV *hook)
2430 PROTOTYPE: $
2431 CODE:
2432 LOCK;
2433 SvREFCNT_dec (coro_readyhook);
2434 coro_readyhook = SvOK (hook) ? newSVsv (hook) : 0;
2435 UNLOCK;
1049 2436
1050int 2437int
2438prio (Coro::State coro, int newprio = 0)
2439 PROTOTYPE: $;$
2440 ALIAS:
2441 nice = 1
2442 CODE:
2443{
2444 RETVAL = coro->prio;
2445
2446 if (items > 1)
2447 {
2448 if (ix)
2449 newprio = coro->prio - newprio;
2450
2451 if (newprio < PRIO_MIN) newprio = PRIO_MIN;
2452 if (newprio > PRIO_MAX) newprio = PRIO_MAX;
2453
2454 coro->prio = newprio;
2455 }
2456}
2457 OUTPUT:
2458 RETVAL
2459
2460SV *
2461ready (SV *self)
2462 PROTOTYPE: $
2463 CODE:
2464 RETVAL = boolSV (api_ready (aTHX_ self));
2465 OUTPUT:
2466 RETVAL
2467
2468int
1051nready(...) 2469nready (...)
1052 PROTOTYPE: 2470 PROTOTYPE:
1053 CODE: 2471 CODE:
1054 RETVAL = coro_nready; 2472 RETVAL = coro_nready;
1055 OUTPUT: 2473 OUTPUT:
1056 RETVAL 2474 RETVAL
1057 2475
2476# for async_pool speedup
1058void 2477void
1059schedule(...) 2478_pool_1 (SV *cb)
1060 PROTOTYPE:
1061 ALIAS:
1062 cede = 1
1063 CODE: 2479 CODE:
1064 api_schedule (ix); 2480{
2481 struct coro *coro = SvSTATE (coro_current);
2482 HV *hv = (HV *)SvRV (coro_current);
2483 AV *defav = GvAV (PL_defgv);
2484 SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
2485 AV *invoke_av;
2486 int i, len;
1065 2487
2488 if (!invoke)
2489 {
2490 SV *old = PL_diehook;
2491 PL_diehook = 0;
2492 SvREFCNT_dec (old);
2493 croak ("\3async_pool terminate\2\n");
2494 }
2495
2496 SvREFCNT_dec (coro->saved_deffh);
2497 coro->saved_deffh = SvREFCNT_inc_NN ((SV *)PL_defoutgv);
2498
2499 hv_store (hv, "desc", sizeof ("desc") - 1,
2500 newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
2501
2502 invoke_av = (AV *)SvRV (invoke);
2503 len = av_len (invoke_av);
2504
2505 sv_setsv (cb, AvARRAY (invoke_av)[0]);
2506
2507 if (len > 0)
2508 {
2509 av_fill (defav, len - 1);
2510 for (i = 0; i < len; ++i)
2511 av_store (defav, i, SvREFCNT_inc_NN (AvARRAY (invoke_av)[i + 1]));
2512 }
2513}
2514
2515void
2516_pool_2 (SV *cb)
2517 CODE:
2518{
2519 struct coro *coro = SvSTATE (coro_current);
2520
2521 sv_setsv (cb, &PL_sv_undef);
2522
2523 SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
2524 coro->saved_deffh = 0;
2525
2526 if (coro_rss (aTHX_ coro) > SvUV (sv_pool_rss)
2527 || av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
2528 {
2529 SV *old = PL_diehook;
2530 PL_diehook = 0;
2531 SvREFCNT_dec (old);
2532 croak ("\3async_pool terminate\2\n");
2533 }
2534
2535 av_clear (GvAV (PL_defgv));
2536 hv_store ((HV *)SvRV (coro_current), "desc", sizeof ("desc") - 1,
2537 newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
2538
2539 coro->prio = 0;
2540
2541 if (coro->cctx && (coro->cctx->flags & CC_TRACE))
2542 api_trace (aTHX_ coro_current, 0);
2543
2544 av_push (av_async_pool, newSVsv (coro_current));
2545}
2546
2547
2548MODULE = Coro::State PACKAGE = Coro::AIO
2549
2550void
2551_get_state (SV *self)
2552 PROTOTYPE: $
2553 PPCODE:
2554{
2555 AV *defav = GvAV (PL_defgv);
2556 AV *av = newAV ();
2557 int i;
2558 SV *data_sv = newSV (sizeof (struct io_state));
2559 struct io_state *data = (struct io_state *)SvPVX (data_sv);
2560 SvCUR_set (data_sv, sizeof (struct io_state));
2561 SvPOK_only (data_sv);
2562
2563 data->errorno = errno;
2564 data->laststype = PL_laststype;
2565 data->laststatval = PL_laststatval;
2566 data->statcache = PL_statcache;
2567
2568 av_extend (av, AvFILLp (defav) + 1 + 1);
2569
2570 for (i = 0; i <= AvFILLp (defav); ++i)
2571 av_push (av, SvREFCNT_inc_NN (AvARRAY (defav)[i]));
2572
2573 av_push (av, data_sv);
2574
2575 XPUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
2576
2577 api_ready (aTHX_ self);
2578}
2579
2580void
2581_set_state (SV *state)
2582 PROTOTYPE: $
2583 PPCODE:
2584{
2585 AV *av = (AV *)SvRV (state);
2586 struct io_state *data = (struct io_state *)SvPVX (AvARRAY (av)[AvFILLp (av)]);
2587 int i;
2588
2589 errno = data->errorno;
2590 PL_laststype = data->laststype;
2591 PL_laststatval = data->laststatval;
2592 PL_statcache = data->statcache;
2593
2594 EXTEND (SP, AvFILLp (av));
2595 for (i = 0; i < AvFILLp (av); ++i)
2596 PUSHs (sv_2mortal (SvREFCNT_inc_NN (AvARRAY (av)[i])));
2597}
2598
2599
2600MODULE = Coro::State PACKAGE = Coro::AnyEvent
2601
2602BOOT:
2603 sv_activity = coro_get_sv (aTHX_ "Coro::AnyEvent::ACTIVITY", TRUE);
2604
2605void
2606_schedule (...)
2607 CODE:
2608{
2609 static int incede;
2610
2611 api_cede_notself (aTHX);
2612
2613 ++incede;
2614 while (coro_nready >= incede && api_cede (aTHX))
2615 ;
2616
2617 sv_setsv (sv_activity, &PL_sv_undef);
2618 if (coro_nready >= incede)
2619 {
2620 PUSHMARK (SP);
2621 PUTBACK;
2622 call_pv ("Coro::AnyEvent::_activity", G_DISCARD | G_EVAL);
2623 SPAGAIN;
2624 }
2625
2626 --incede;
2627}
2628
2629
2630MODULE = Coro::State PACKAGE = PerlIO::cede
2631
2632BOOT:
2633 PerlIO_define_layer (aTHX_ &PerlIO_cede);
2634
2635MODULE = Coro::State PACKAGE = Coro::Semaphore
2636
2637SV *
2638new (SV *klass, SV *count_ = 0)
2639 CODE:
2640{
2641 /* a semaphore contains a counter IV in $sem->[0] and any waiters after that */
2642 AV *av = newAV ();
2643 av_push (av, newSViv (count_ && SvOK (count_) ? SvIV (count_) : 1));
2644 RETVAL = sv_bless (newRV_noinc ((SV *)av), GvSTASH (CvGV (cv)));
2645}
2646 OUTPUT:
2647 RETVAL
2648
2649SV *
2650count (SV *self)
2651 CODE:
2652 RETVAL = newSVsv (AvARRAY ((AV *)SvRV (self))[0]);
2653 OUTPUT:
2654 RETVAL
2655
2656void
2657up (SV *self, int adjust = 1)
2658 ALIAS:
2659 adjust = 1
2660 CODE:
2661{
2662 AV *av = (AV *)SvRV (self);
2663 SV *count_sv = AvARRAY (av)[0];
2664 IV count = SvIVX (count_sv);
2665
2666 count += ix ? adjust : 1;
2667 SvIVX (count_sv) = count;
2668
2669 /* now wake up as many waiters as possible */
2670 while (count > 0 && AvFILLp (av) >= count)
2671 {
2672 SV *cb;
2673
2674 /* swap first two elements so we can shift a waiter */
2675 AvARRAY (av)[0] = AvARRAY (av)[1];
2676 AvARRAY (av)[1] = count_sv;
2677 cb = av_shift (av);
2678
2679 if (SvOBJECT (cb))
2680 api_ready (aTHX_ cb);
2681 else
2682 croak ("callbacks not yet supported");
2683
2684 SvREFCNT_dec (cb);
2685 }
2686}
2687
2688void
2689down (SV *self)
2690 CODE:
2691 api_execute_slf (aTHX_ cv, slf_init_semaphore_down, &ST (0), 1);
2692
2693void
2694try (SV *self)
2695 PPCODE:
2696{
2697 AV *av = (AV *)SvRV (self);
2698 SV *count_sv = AvARRAY (av)[0];
2699 IV count = SvIVX (count_sv);
2700
2701 if (count > 0)
2702 {
2703 --count;
2704 SvIVX (count_sv) = count;
2705 XSRETURN_YES;
2706 }
2707 else
2708 XSRETURN_NO;
2709}
2710
2711void
2712waiters (SV *self)
2713 CODE:
2714{
2715 AV *av = (AV *)SvRV (self);
2716
2717 if (GIMME_V == G_SCALAR)
2718 XPUSHs (sv_2mortal (newSVsv (AvARRAY (av)[0])));
2719 else
2720 {
2721 int i;
2722 EXTEND (SP, AvFILLp (av) + 1 - 1);
2723 for (i = 1; i <= AvFILLp (av); ++i)
2724 PUSHs (newSVsv (AvARRAY (av)[i]));
2725 }
2726}
2727

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