1 |
#include "EXTERN.h" |
2 |
#include "perl.h" |
3 |
#include "XSUB.h" |
4 |
|
5 |
#include "libcoro/coro.c" |
6 |
|
7 |
#include <signal.h> |
8 |
|
9 |
#ifdef HAVE_MMAP |
10 |
# include <unistd.h> |
11 |
# include <sys/mman.h> |
12 |
# ifndef MAP_ANON |
13 |
# ifdef MAP_ANONYMOUS |
14 |
# define MAP_ANON MAP_ANONYMOUS |
15 |
# else |
16 |
# undef HAVE_MMAP |
17 |
# endif |
18 |
# endif |
19 |
#endif |
20 |
|
21 |
#define MAY_FLUSH /* increases codesize and is rarely used */ |
22 |
|
23 |
#define SUB_INIT "Coro::State::initialize" |
24 |
#define UCORO_STATE "_coro_state" |
25 |
|
26 |
/* The next macro should declare a variable stacklevel that contains and approximation |
27 |
* to the current C stack pointer. Its property is that it changes with each call |
28 |
* and should be unique. */ |
29 |
#define dSTACKLEVEL void *stacklevel = &stacklevel |
30 |
|
31 |
#define labs(l) ((l) >= 0 ? (l) : -(l)) |
32 |
|
33 |
#include "CoroAPI.h" |
34 |
|
35 |
static struct CoroAPI coroapi; |
36 |
|
37 |
/* this is actually not only the c stack but also c registers etc... */ |
38 |
typedef struct { |
39 |
int refcnt; /* pointer reference counter */ |
40 |
int usecnt; /* shared by how many coroutines */ |
41 |
int gencnt; /* generation counter */ |
42 |
|
43 |
coro_context cctx; |
44 |
|
45 |
void *sptr; |
46 |
long ssize; /* positive == mmap, otherwise malloc */ |
47 |
} coro_stack; |
48 |
|
49 |
struct coro { |
50 |
/* the optional C context */ |
51 |
coro_stack *stack; |
52 |
void *cursp; |
53 |
int gencnt; |
54 |
|
55 |
/* optionally saved, might be zero */ |
56 |
AV *defav; |
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; |
68 |
SV **stack_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 |
|
92 |
/* data associated with this coroutine (initial args) */ |
93 |
AV *args; |
94 |
}; |
95 |
|
96 |
typedef struct coro *Coro__State; |
97 |
typedef struct coro *Coro__State_or_hashref; |
98 |
|
99 |
static AV *main_mainstack; /* used to differentiate between $main and others */ |
100 |
static HV *coro_state_stash; |
101 |
static SV *ucoro_state_sv; |
102 |
static U32 ucoro_state_hash; |
103 |
static HV *padlist_cache; |
104 |
|
105 |
/* mostly copied from op.c:cv_clone2 */ |
106 |
STATIC AV * |
107 |
clone_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 |
200 |
STATIC void |
201 |
free_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 */ |
221 |
STATIC void |
222 |
get_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 |
|
232 |
STATIC void |
233 |
put_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 |
247 |
STATIC void |
248 |
flush_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 |
|
280 |
static void |
281 |
load_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 |
|
342 |
static void |
343 |
save_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 |
do |
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 |
while (cxix >= 0); |
397 |
|
398 |
if (top_si->si_type == PERLSI_MAIN) |
399 |
break; |
400 |
|
401 |
top_si = top_si->si_prev; |
402 |
ccstk = top_si->si_cxstack; |
403 |
cxix = top_si->si_cxix; |
404 |
} |
405 |
|
406 |
PUTBACK; |
407 |
} |
408 |
|
409 |
c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0; |
410 |
c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0; |
411 |
c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0; |
412 |
|
413 |
c->dowarn = PL_dowarn; |
414 |
c->in_eval = PL_in_eval; |
415 |
|
416 |
c->curstackinfo = PL_curstackinfo; |
417 |
c->curstack = PL_curstack; |
418 |
c->mainstack = PL_mainstack; |
419 |
c->stack_sp = PL_stack_sp; |
420 |
c->op = PL_op; |
421 |
c->curpad = PL_curpad; |
422 |
c->stack_base = PL_stack_base; |
423 |
c->stack_max = PL_stack_max; |
424 |
c->tmps_stack = PL_tmps_stack; |
425 |
c->tmps_floor = PL_tmps_floor; |
426 |
c->tmps_ix = PL_tmps_ix; |
427 |
c->tmps_max = PL_tmps_max; |
428 |
c->markstack = PL_markstack; |
429 |
c->markstack_ptr = PL_markstack_ptr; |
430 |
c->markstack_max = PL_markstack_max; |
431 |
c->scopestack = PL_scopestack; |
432 |
c->scopestack_ix = PL_scopestack_ix; |
433 |
c->scopestack_max = PL_scopestack_max; |
434 |
c->savestack = PL_savestack; |
435 |
c->savestack_ix = PL_savestack_ix; |
436 |
c->savestack_max = PL_savestack_max; |
437 |
c->retstack = PL_retstack; |
438 |
c->retstack_ix = PL_retstack_ix; |
439 |
c->retstack_max = PL_retstack_max; |
440 |
c->curcop = PL_curcop; |
441 |
c->top_env = PL_top_env; |
442 |
} |
443 |
|
444 |
/* |
445 |
* allocate various perl stacks. This is an exact copy |
446 |
* of perl.c:init_stacks, except that it uses less memory |
447 |
* on the assumption that coroutines do not usually need |
448 |
* a lot of stackspace. |
449 |
*/ |
450 |
STATIC void |
451 |
coro_init_stacks (pTHX) |
452 |
{ |
453 |
PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1); |
454 |
PL_curstackinfo->si_type = PERLSI_MAIN; |
455 |
PL_curstack = PL_curstackinfo->si_stack; |
456 |
PL_mainstack = PL_curstack; /* remember in case we switch stacks */ |
457 |
|
458 |
PL_stack_base = AvARRAY(PL_curstack); |
459 |
PL_stack_sp = PL_stack_base; |
460 |
PL_stack_max = PL_stack_base + AvMAX(PL_curstack); |
461 |
|
462 |
New(50,PL_tmps_stack,96,SV*); |
463 |
PL_tmps_floor = -1; |
464 |
PL_tmps_ix = -1; |
465 |
PL_tmps_max = 96; |
466 |
|
467 |
New(54,PL_markstack,16,I32); |
468 |
PL_markstack_ptr = PL_markstack; |
469 |
PL_markstack_max = PL_markstack + 16; |
470 |
|
471 |
SET_MARK_OFFSET; |
472 |
|
473 |
New(54,PL_scopestack,16,I32); |
474 |
PL_scopestack_ix = 0; |
475 |
PL_scopestack_max = 16; |
476 |
|
477 |
New(54,PL_savestack,96,ANY); |
478 |
PL_savestack_ix = 0; |
479 |
PL_savestack_max = 96; |
480 |
|
481 |
New(54,PL_retstack,8,OP*); |
482 |
PL_retstack_ix = 0; |
483 |
PL_retstack_max = 8; |
484 |
} |
485 |
|
486 |
/* |
487 |
* destroy the stacks, the callchain etc... |
488 |
* still there is a memleak of 128 bytes... |
489 |
*/ |
490 |
STATIC void |
491 |
destroy_stacks(pTHX) |
492 |
{ |
493 |
/* is this ugly, I ask? */ |
494 |
while (PL_scopestack_ix) |
495 |
LEAVE; |
496 |
|
497 |
/* sure it is, but more important: is it correct?? :/ */ |
498 |
while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */ |
499 |
FREETMPS; |
500 |
|
501 |
while (PL_curstackinfo->si_next) |
502 |
PL_curstackinfo = PL_curstackinfo->si_next; |
503 |
|
504 |
while (PL_curstackinfo) |
505 |
{ |
506 |
PERL_SI *p = PL_curstackinfo->si_prev; |
507 |
|
508 |
{ |
509 |
dSP; |
510 |
SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack); |
511 |
PUTBACK; /* possibly superfluous */ |
512 |
} |
513 |
|
514 |
if (PL_main_cv != Nullcv) /* don't during destruction. hack? */ |
515 |
dounwind(-1); |
516 |
|
517 |
SvREFCNT_dec(PL_curstackinfo->si_stack); |
518 |
Safefree(PL_curstackinfo->si_cxstack); |
519 |
Safefree(PL_curstackinfo); |
520 |
PL_curstackinfo = p; |
521 |
} |
522 |
|
523 |
Safefree(PL_tmps_stack); |
524 |
Safefree(PL_markstack); |
525 |
Safefree(PL_scopestack); |
526 |
Safefree(PL_savestack); |
527 |
Safefree(PL_retstack); |
528 |
} |
529 |
|
530 |
static void |
531 |
allocate_stack (Coro__State ctx, int alloc) |
532 |
{ |
533 |
coro_stack *stack; |
534 |
|
535 |
New (0, stack, 1, coro_stack); |
536 |
|
537 |
stack->refcnt = 1; |
538 |
stack->usecnt = 1; |
539 |
stack->gencnt = ctx->gencnt = 0; |
540 |
if (alloc) |
541 |
{ |
542 |
#ifdef HAVE_MMAP |
543 |
stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */ |
544 |
stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0); |
545 |
if (stack->sptr == (void *)-1) |
546 |
#endif |
547 |
{ |
548 |
/*FIXME*//*D*//* reasonable stack size! */ |
549 |
stack->ssize = -4096 * sizeof (long); |
550 |
New (0, stack->sptr, 4096, long); |
551 |
} |
552 |
} |
553 |
else |
554 |
stack->sptr = 0; |
555 |
|
556 |
ctx->stack = stack; |
557 |
} |
558 |
|
559 |
static void |
560 |
deallocate_stack (Coro__State ctx) |
561 |
{ |
562 |
coro_stack *stack = ctx->stack; |
563 |
|
564 |
ctx->stack = 0; |
565 |
|
566 |
if (stack) |
567 |
{ |
568 |
if (!--stack->refcnt) |
569 |
{ |
570 |
#ifdef HAVE_MMAP |
571 |
if (stack->ssize > 0 && stack->sptr) |
572 |
munmap (stack->sptr, stack->ssize); |
573 |
else |
574 |
#else |
575 |
Safefree (stack->sptr); |
576 |
#endif |
577 |
Safefree (stack); |
578 |
} |
579 |
else if (ctx->gencnt == stack->gencnt) |
580 |
--stack->usecnt; |
581 |
} |
582 |
} |
583 |
|
584 |
static void |
585 |
setup_coro (void *arg) |
586 |
{ |
587 |
/* |
588 |
* emulate part of the perl startup here. |
589 |
*/ |
590 |
dSP; |
591 |
Coro__State ctx = (Coro__State)arg; |
592 |
SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE); |
593 |
|
594 |
coro_init_stacks (aTHX); |
595 |
/*PL_curcop = 0;*/ |
596 |
/*PL_in_eval = PL_in_eval;*/ /* inherit */ |
597 |
SvREFCNT_dec (GvAV (PL_defgv)); |
598 |
GvAV (PL_defgv) = ctx->args; |
599 |
|
600 |
SPAGAIN; |
601 |
|
602 |
if (ctx->stack) |
603 |
{ |
604 |
ctx->cursp = 0; |
605 |
|
606 |
PUSHMARK(SP); |
607 |
PUTBACK; |
608 |
(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL); |
609 |
|
610 |
if (SvTRUE (ERRSV)) |
611 |
croak (NULL); |
612 |
else |
613 |
croak ("FATAL: CCTXT coroutine returned!"); |
614 |
} |
615 |
else |
616 |
{ |
617 |
UNOP myop; |
618 |
|
619 |
PL_op = (OP *)&myop; |
620 |
|
621 |
Zero(&myop, 1, UNOP); |
622 |
myop.op_next = Nullop; |
623 |
myop.op_flags = OPf_WANT_VOID; |
624 |
|
625 |
PUSHMARK(SP); |
626 |
XPUSHs (sub_init); |
627 |
/* |
628 |
* the next line is slightly wrong, as PL_op->op_next |
629 |
* is actually being executed so we skip the first op. |
630 |
* that doesn't matter, though, since it is only |
631 |
* pp_nextstate and we never return... |
632 |
* ah yes, and I don't care anyways ;) |
633 |
*/ |
634 |
PUTBACK; |
635 |
PL_op = pp_entersub(); |
636 |
SPAGAIN; |
637 |
|
638 |
ENTER; /* necessary e.g. for dounwind */ |
639 |
} |
640 |
} |
641 |
|
642 |
static void |
643 |
continue_coro (void *arg) |
644 |
{ |
645 |
/* |
646 |
* this is a _very_ stripped down perl interpreter ;) |
647 |
*/ |
648 |
Coro__State ctx = (Coro__State)arg; |
649 |
|
650 |
/*FIXME*//* must set up top_env here */ |
651 |
ctx->cursp = 0; |
652 |
PL_op = PL_op->op_next; |
653 |
CALLRUNOPS(aTHX); |
654 |
|
655 |
abort (); |
656 |
} |
657 |
|
658 |
STATIC void |
659 |
transfer(pTHX_ struct coro *prev, struct coro *next, int flags) |
660 |
{ |
661 |
dSTACKLEVEL; |
662 |
static struct coro *xnext; |
663 |
|
664 |
if (prev != next) |
665 |
{ |
666 |
xnext = next; |
667 |
|
668 |
if (next->mainstack) |
669 |
{ |
670 |
SAVE (prev, flags); |
671 |
LOAD (next); |
672 |
|
673 |
/* mark this state as in-use */ |
674 |
next->mainstack = 0; |
675 |
next->tmps_ix = -2; |
676 |
|
677 |
/* stacklevel changed? if yes, grab the stack for us! */ |
678 |
if (flags & TRANSFER_SAVE_CCTXT) |
679 |
{ |
680 |
if (!prev->stack) |
681 |
allocate_stack (prev, 0); |
682 |
else if (prev->cursp != stacklevel |
683 |
&& prev->stack->usecnt > 1) |
684 |
{ |
685 |
prev->gencnt = ++prev->stack->gencnt; |
686 |
prev->stack->usecnt = 1; |
687 |
} |
688 |
|
689 |
/* has our stack been invalidated? */ |
690 |
if (next->stack && next->stack->gencnt != next->gencnt) |
691 |
{ |
692 |
deallocate_stack (next); |
693 |
allocate_stack (next, 1); |
694 |
coro_create (&(next->stack->cctx), |
695 |
continue_coro, (void *)next, |
696 |
next->stack->sptr, labs (next->stack->ssize)); |
697 |
} |
698 |
|
699 |
coro_transfer (&(prev->stack->cctx), &(next->stack->cctx)); |
700 |
/* don't add any code here */ |
701 |
} |
702 |
|
703 |
} |
704 |
else if (next->tmps_ix == -2) |
705 |
croak ("tried to transfer to running coroutine"); |
706 |
else |
707 |
{ |
708 |
SAVE (prev, -1); /* first get rid of the old state */ |
709 |
|
710 |
if (flags & TRANSFER_SAVE_CCTXT) |
711 |
{ |
712 |
if (!prev->stack) |
713 |
allocate_stack (prev, 0); |
714 |
|
715 |
if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK) |
716 |
{ |
717 |
setup_coro (next); |
718 |
|
719 |
prev->stack->refcnt++; |
720 |
prev->stack->usecnt++; |
721 |
next->stack = prev->stack; |
722 |
next->gencnt = prev->gencnt; |
723 |
} |
724 |
else |
725 |
{ |
726 |
allocate_stack (next, 1); |
727 |
coro_create (&(next->stack->cctx), |
728 |
setup_coro, (void *)next, |
729 |
next->stack->sptr, labs (next->stack->ssize)); |
730 |
coro_transfer (&(prev->stack->cctx), &(next->stack->cctx)); |
731 |
/* don't add any code here */ |
732 |
} |
733 |
} |
734 |
else |
735 |
setup_coro (next); |
736 |
} |
737 |
} |
738 |
|
739 |
/* |
740 |
* xnext is now either prev or next, depending on wether |
741 |
* we switched the c stack or not. that's why i use a global |
742 |
* variable, that should become thread-specific at one point. |
743 |
*/ |
744 |
xnext->cursp = stacklevel; |
745 |
} |
746 |
|
747 |
static struct coro * |
748 |
sv_to_coro (SV *arg, const char *funcname, const char *varname) |
749 |
{ |
750 |
if (SvROK(arg) && SvTYPE(SvRV(arg)) == SVt_PVHV) |
751 |
{ |
752 |
HE *he = hv_fetch_ent((HV *)SvRV(arg), ucoro_state_sv, 0, ucoro_state_hash); |
753 |
|
754 |
if (!he) |
755 |
croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", funcname, varname); |
756 |
|
757 |
arg = HeVAL(he); |
758 |
} |
759 |
|
760 |
/* must also be changed inside Coro::Cont::yield */ |
761 |
if (SvROK(arg) && SvSTASH(SvRV(arg)) == coro_state_stash) |
762 |
return (struct coro *) SvIV((SV*)SvRV(arg)); |
763 |
|
764 |
croak ("%s() -- %s is not (and contains not) a Coro::State object", funcname, varname); |
765 |
/*NORETURN*/ |
766 |
} |
767 |
|
768 |
static void |
769 |
api_transfer(pTHX_ SV *prev, SV *next, int flags) |
770 |
{ |
771 |
transfer(aTHX_ |
772 |
sv_to_coro (prev, "Coro::transfer", "prev"), |
773 |
sv_to_coro (next, "Coro::transfer", "next"), |
774 |
flags); |
775 |
} |
776 |
|
777 |
/** Coro ********************************************************************/ |
778 |
|
779 |
#define PRIO_MAX 3 |
780 |
#define PRIO_HIGH 1 |
781 |
#define PRIO_NORMAL 0 |
782 |
#define PRIO_LOW -1 |
783 |
#define PRIO_IDLE -3 |
784 |
#define PRIO_MIN -4 |
785 |
|
786 |
/* for Coro.pm */ |
787 |
static GV *coro_current, *coro_idle; |
788 |
static AV *coro_ready[PRIO_MAX-PRIO_MIN+1]; |
789 |
static int coro_nready; |
790 |
|
791 |
static void |
792 |
coro_enq (SV *sv) |
793 |
{ |
794 |
if (SvROK (sv)) |
795 |
{ |
796 |
SV *hv = SvRV (sv); |
797 |
if (SvTYPE (hv) == SVt_PVHV) |
798 |
{ |
799 |
SV **xprio = hv_fetch ((HV *)hv, "prio", 4, 0); |
800 |
int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL; |
801 |
|
802 |
prio = prio > PRIO_MAX ? PRIO_MAX |
803 |
: prio < PRIO_MIN ? PRIO_MIN |
804 |
: prio; |
805 |
|
806 |
av_push (coro_ready [prio - PRIO_MIN], sv); |
807 |
coro_nready++; |
808 |
|
809 |
return; |
810 |
} |
811 |
} |
812 |
|
813 |
croak ("Coro::ready tried to enqueue something that is not a coroutine"); |
814 |
} |
815 |
|
816 |
static SV * |
817 |
coro_deq (int min_prio) |
818 |
{ |
819 |
int prio = PRIO_MAX - PRIO_MIN; |
820 |
|
821 |
min_prio -= PRIO_MIN; |
822 |
if (min_prio < 0) |
823 |
min_prio = 0; |
824 |
|
825 |
for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; ) |
826 |
if (av_len (coro_ready[prio]) >= 0) |
827 |
{ |
828 |
coro_nready--; |
829 |
return av_shift (coro_ready[prio]); |
830 |
} |
831 |
|
832 |
return 0; |
833 |
} |
834 |
|
835 |
static void |
836 |
api_ready (SV *coro) |
837 |
{ |
838 |
coro_enq (SvREFCNT_inc (coro)); |
839 |
} |
840 |
|
841 |
static void |
842 |
api_schedule (int cede) |
843 |
{ |
844 |
SV *prev, *next; |
845 |
|
846 |
prev = GvSV (coro_current); |
847 |
|
848 |
if (cede) |
849 |
coro_enq (SvREFCNT_inc (prev)); |
850 |
|
851 |
next = coro_deq (PRIO_MIN); |
852 |
|
853 |
if (!next) |
854 |
next = SvREFCNT_inc (GvSV (coro_idle)); |
855 |
|
856 |
GvSV (coro_current) = SvREFCNT_inc (next); |
857 |
transfer (aTHX_ |
858 |
sv_to_coro (prev, "Coro::schedule", "current coroutine"), |
859 |
sv_to_coro (next, "Coro::schedule", "next coroutine"), |
860 |
TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK); |
861 |
SvREFCNT_dec (next); |
862 |
SvREFCNT_dec (prev); |
863 |
} |
864 |
|
865 |
MODULE = Coro::State PACKAGE = Coro::State |
866 |
|
867 |
PROTOTYPES: ENABLE |
868 |
|
869 |
BOOT: |
870 |
{ /* {} necessary for stoopid perl-5.6.x */ |
871 |
ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1); |
872 |
PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1); |
873 |
coro_state_stash = gv_stashpv ("Coro::State", TRUE); |
874 |
|
875 |
newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV)); |
876 |
newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV)); |
877 |
newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV)); |
878 |
newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT)); |
879 |
|
880 |
if (!padlist_cache) |
881 |
padlist_cache = newHV (); |
882 |
|
883 |
main_mainstack = PL_mainstack; |
884 |
|
885 |
coroapi.ver = CORO_API_VERSION; |
886 |
coroapi.transfer = api_transfer; |
887 |
} |
888 |
|
889 |
Coro::State |
890 |
_newprocess(args) |
891 |
SV * args |
892 |
PROTOTYPE: $ |
893 |
CODE: |
894 |
Coro__State coro; |
895 |
|
896 |
if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV) |
897 |
croak ("Coro::State::_newprocess expects an arrayref"); |
898 |
|
899 |
New (0, coro, 1, struct coro); |
900 |
|
901 |
coro->args = (AV *)SvREFCNT_inc (SvRV (args)); |
902 |
coro->mainstack = 0; /* actual work is done inside transfer */ |
903 |
coro->stack = 0; |
904 |
|
905 |
RETVAL = coro; |
906 |
OUTPUT: |
907 |
RETVAL |
908 |
|
909 |
void |
910 |
transfer(prev, next, flags) |
911 |
Coro::State_or_hashref prev |
912 |
Coro::State_or_hashref next |
913 |
int flags |
914 |
PROTOTYPE: @ |
915 |
CODE: |
916 |
PUTBACK; |
917 |
transfer (aTHX_ prev, next, flags); |
918 |
SPAGAIN; |
919 |
|
920 |
void |
921 |
DESTROY(coro) |
922 |
Coro::State coro |
923 |
CODE: |
924 |
|
925 |
if (coro->mainstack && coro->mainstack != main_mainstack) |
926 |
{ |
927 |
struct coro temp; |
928 |
|
929 |
PUTBACK; |
930 |
SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL); |
931 |
LOAD(aTHX_ coro); |
932 |
SPAGAIN; |
933 |
|
934 |
destroy_stacks (aTHX); |
935 |
|
936 |
LOAD((&temp)); /* this will get rid of defsv etc.. */ |
937 |
SPAGAIN; |
938 |
|
939 |
coro->mainstack = 0; |
940 |
} |
941 |
|
942 |
deallocate_stack (coro); |
943 |
|
944 |
Safefree (coro); |
945 |
|
946 |
void |
947 |
flush() |
948 |
CODE: |
949 |
#ifdef MAY_FLUSH |
950 |
flush_padlist_cache (); |
951 |
#endif |
952 |
|
953 |
void |
954 |
_exit(code) |
955 |
int code |
956 |
PROTOTYPE: $ |
957 |
CODE: |
958 |
#if defined(__GLIBC__) || _POSIX_C_SOURCE |
959 |
_exit (code); |
960 |
#else |
961 |
signal (SIGTERM, SIG_DFL); |
962 |
raise (SIGTERM); |
963 |
exit (code); |
964 |
#endif |
965 |
|
966 |
MODULE = Coro::State PACKAGE = Coro::Cont |
967 |
|
968 |
# this is slightly dirty (should expose a c-level api) |
969 |
|
970 |
void |
971 |
yield(...) |
972 |
PROTOTYPE: @ |
973 |
CODE: |
974 |
static SV *returnstk; |
975 |
SV *sv; |
976 |
AV *defav = GvAV (PL_defgv); |
977 |
struct coro *prev, *next; |
978 |
|
979 |
if (!returnstk) |
980 |
returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE)); |
981 |
|
982 |
/* set up @_ -- ugly */ |
983 |
av_clear (defav); |
984 |
av_fill (defav, items - 1); |
985 |
while (items--) |
986 |
av_store (defav, items, SvREFCNT_inc (ST(items))); |
987 |
|
988 |
mg_get (returnstk); /* isn't documentation wrong for mg_get? */ |
989 |
sv = av_pop ((AV *)SvRV (returnstk)); |
990 |
prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0))); |
991 |
next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0))); |
992 |
SvREFCNT_dec (sv); |
993 |
|
994 |
transfer(aTHX_ prev, next, 0); |
995 |
|
996 |
MODULE = Coro::State PACKAGE = Coro |
997 |
|
998 |
# this is slightly dirty (should expose a c-level api) |
999 |
|
1000 |
BOOT: |
1001 |
{ |
1002 |
int i; |
1003 |
HV *stash = gv_stashpv ("Coro", TRUE); |
1004 |
|
1005 |
newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX)); |
1006 |
newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH)); |
1007 |
newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL)); |
1008 |
newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW)); |
1009 |
newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE)); |
1010 |
newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN)); |
1011 |
|
1012 |
coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV); |
1013 |
coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV); |
1014 |
|
1015 |
for (i = PRIO_MAX - PRIO_MIN + 1; i--; ) |
1016 |
coro_ready[i] = newAV (); |
1017 |
|
1018 |
{ |
1019 |
SV *sv = perl_get_sv("Coro::API", 1); |
1020 |
|
1021 |
coroapi.schedule = api_schedule; |
1022 |
coroapi.ready = api_ready; |
1023 |
coroapi.nready = &coro_nready; |
1024 |
coroapi.current = coro_current; |
1025 |
|
1026 |
GCoroAPI = &coroapi; |
1027 |
sv_setiv(sv, (IV)&coroapi); |
1028 |
SvREADONLY_on(sv); |
1029 |
} |
1030 |
} |
1031 |
|
1032 |
void |
1033 |
ready(self) |
1034 |
SV * self |
1035 |
CODE: |
1036 |
api_ready (self); |
1037 |
|
1038 |
int |
1039 |
nready(...) |
1040 |
PROTOTYPE: |
1041 |
CODE: |
1042 |
RETVAL = coro_nready; |
1043 |
OUTPUT: |
1044 |
RETVAL |
1045 |
|
1046 |
void |
1047 |
schedule(...) |
1048 |
PROTOTYPE: |
1049 |
ALIAS: |
1050 |
cede = 1 |
1051 |
CODE: |
1052 |
api_schedule (ix); |
1053 |
|