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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.48 by pcg, Sat Nov 15 03:53:37 2003 UTC vs.
Revision 1.103 by root, Mon Nov 27 01:33:30 2006 UTC

		1	#include "libcoro/coro.c"
		2
1	#include "EXTERN.h"	3	#include "EXTERN.h"
2	#include "perl.h"	4	#include "perl.h"
3	#include "XSUB.h"	5	#include "XSUB.h"
4		6
5	#include "patchlevel.h"	7	#include "patchlevel.h"
6		8
7	#if PATCHLEVEL < 6	9	#define PERL_VERSION_ATLEAST(a,b,c) \
		10	(PERL_REVISION > (a) \
		11	|| (PERL_REVISION == (a) \
		12	&& (PERL_VERSION > (b) \
		13	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		14
		15	#if !PERL_VERSION_ATLEAST (5,6,0)
8	# ifndef PL_ppaddr	16	# ifndef PL_ppaddr
9	# define PL_ppaddr ppaddr	17	# define PL_ppaddr ppaddr
10	# endif	18	# endif
11	# ifndef call_sv	19	# ifndef call_sv
12	# define call_sv perl_call_sv	20	# define call_sv perl_call_sv
…		…
23	# ifndef IS_PADCONST	31	# ifndef IS_PADCONST
24	# define IS_PADCONST(v) 0	32	# define IS_PADCONST(v) 0
25	# endif	33	# endif
26	#endif	34	#endif
27		35
28	#include "libcoro/coro.c"
29
30	#include <signal.h>	36	#include <stdio.h>
		37	#include <errno.h>
		38
		39	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		40	# undef STACKGUARD
		41	#endif
		42
		43	#ifndef STACKGUARD
		44	# define STACKGUARD 0
		45	#endif
31		46
32	#ifdef HAVE_MMAP	47	#ifdef HAVE_MMAP
33	# include <unistd.h>	48	# include <unistd.h>
34	# include <sys/mman.h>	49	# include <sys/mman.h>
35	# ifndef MAP_ANONYMOUS	50	# ifndef MAP_ANONYMOUS
…		…
37	# define MAP_ANONYMOUS MAP_ANON	52	# define MAP_ANONYMOUS MAP_ANON
38	# else	53	# else
39	# undef HAVE_MMAP	54	# undef HAVE_MMAP
40	# endif	55	# endif
41	# endif	56	# endif
		57	# include <limits.h>
		58	# ifndef PAGESIZE
		59	# define PAGESIZE pagesize
		60	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		61	static long pagesize;
		62	# else
		63	# define BOOT_PAGESIZE
42	#endif	64	# endif
43		65	#endif
44	#define MAY_FLUSH /* increases codesize and is rarely used */
45
46	#define SUB_INIT "Coro::State::initialize"
47	#define UCORO_STATE "_coro_state"
48		66
49	/* The next macro should declare a variable stacklevel that contains and approximation	67	/* The next macro should declare a variable stacklevel that contains and approximation
50	* to the current C stack pointer. Its property is that it changes with each call	68	* to the current C stack pointer. Its property is that it changes with each call
51	* and should be unique. */	69	* and should be unique. */
		70	#define dSTACKLEVEL int stacklevel
52	#define dSTACKLEVEL void *stacklevel = &stacklevel	71	#define STACKLEVEL ((void *)&stacklevel)
53		72
54	#define IN_DESTRUCT (PL_main_cv == Nullcv)	73	#define IN_DESTRUCT (PL_main_cv == Nullcv)
55		74
56	#define labs(l) ((l) >= 0 ? (l) : -(l))	75	#if __GNUC__ >= 3
		76	# define attribute(x) __attribute__(x)
		77	#else
		78	# define attribute(x)
		79	#endif
		80
		81	#define NOINLINE attribute ((noinline))
57		82
58	#include "CoroAPI.h"	83	#include "CoroAPI.h"
59		84
		85	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
		86
		87	#ifdef USE_ITHREADS
		88	static perl_mutex coro_mutex;
		89	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		90	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		91	#else
		92	# define LOCK (void)0
		93	# define UNLOCK (void)0
		94	#endif
		95
60	static struct CoroAPI coroapi;	96	static struct CoroAPI coroapi;
		97	static AV *main_mainstack; /* used to differentiate between $main and others */
		98	static HV *coro_state_stash, *coro_stash;
		99	static SV *coro_mortal; /* will be freed after next transfer */
61		100
62	/* this is actually not only the c stack but also c registers etc... */	101	/* this is a structure representing a c-level coroutine */
63	typedef struct {	102	typedef struct coro_stack {
64	int refcnt; /* pointer reference counter */	103	struct coro_stack *next;
65	int usecnt; /* shared by how many coroutines */
66	int gencnt; /* generation counter */
67		104
68	coro_context cctx;	105	/* the stack */
69
70	void *sptr;	106	void *sptr;
71	long ssize; /* positive == mmap, otherwise malloc */	107	long ssize; /* positive == mmap, otherwise malloc */
		108
		109	/* cpu state */
		110	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		111	JMPENV *top_env;
		112	coro_context cctx;
72	} coro_stack;	113	} coro_stack;
73		114
		115	/* this is a structure representing a perl-level coroutine */
74	struct coro {	116	struct coro {
75	/* the top-level JMPENV for each coroutine, needed to catch dies. */	117	/* the c coroutine allocated to this perl coroutine, if any */
76	JMPENV start_env;
77
78	/* the optional C context */
79	coro_stack *stack;	118	coro_stack *stack;
80	void *cursp;	119
		120	/* data associated with this coroutine (initial args) */
		121	AV *args;
81	int gencnt;	122	int refcnt;
82		123
83	/* optionally saved, might be zero */	124	/* optionally saved, might be zero */
84	AV *defav;	125	AV *defav;
85	SV *defsv;	126	SV *defsv;
86	SV *errsv;	127	SV *errsv;
…		…
95	AV *mainstack;	136	AV *mainstack;
96	SV **stack_sp;	137	SV **stack_sp;
97	OP *op;	138	OP *op;
98	SV **curpad;	139	SV **curpad;
99	AV *comppad;	140	AV *comppad;
		141	CV *compcv;
100	SV **stack_base;	142	SV **stack_base;
101	SV **stack_max;	143	SV **stack_max;
102	SV **tmps_stack;	144	SV **tmps_stack;
103	I32 tmps_floor;	145	I32 tmps_floor;
104	I32 tmps_ix;	146	I32 tmps_ix;
…		…
113	I32 savestack_ix;	155	I32 savestack_ix;
114	I32 savestack_max;	156	I32 savestack_max;
115	OP **retstack;	157	OP **retstack;
116	I32 retstack_ix;	158	I32 retstack_ix;
117	I32 retstack_max;	159	I32 retstack_max;
		160	PMOP *curpm;
118	COP *curcop;	161	COP *curcop;
119	JMPENV *top_env;
120		162
121	/* data associated with this coroutine (initial args) */	163	/* coro process data */
122	AV *args;	164	int prio;
123	};	165	};
124		166
125	typedef struct coro *Coro__State;	167	typedef struct coro *Coro__State;
126	typedef struct coro *Coro__State_or_hashref;	168	typedef struct coro *Coro__State_or_hashref;
127		169
128	static AV *main_mainstack; /* used to differentiate between $main and others */	170	static AV *
129	static HV *coro_state_stash;	171	coro_clone_padlist (CV *cv)
130	static SV *ucoro_state_sv;
131	static U32 ucoro_state_hash;
132	static HV *padlist_cache;
133	static SV *coro_mortal; /* will be freed after next transfer */
134
135	/* mostly copied from op.c:cv_clone2 */
136	STATIC AV *
137	clone_padlist (AV *protopadlist)
138	{	172	{
139	AV *av;	173	AV *padlist = CvPADLIST (cv);
140	I32 ix;
141	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
142	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
143	SV **pname = AvARRAY (protopad_name);
144	SV **ppad = AvARRAY (protopad);
145	I32 fname = AvFILLp (protopad_name);
146	I32 fpad = AvFILLp (protopad);
147	AV *newpadlist, *newpad_name, *newpad;	174	AV *newpadlist, *newpad;
148	SV **npad;
149
150	newpad_name = newAV ();
151	for (ix = fname; ix >= 0; ix--)
152	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
153
154	newpad = newAV ();
155	av_fill (newpad, AvFILLp (protopad));
156	npad = AvARRAY (newpad);
157		175
158	newpadlist = newAV ();	176	newpadlist = newAV ();
159	AvREAL_off (newpadlist);	177	AvREAL_off (newpadlist);
160	av_store (newpadlist, 0, (SV *) newpad_name);	178	#if PERL_VERSION_ATLEAST (5,9,0)
		179	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		180	#else
		181	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		182	#endif
		183	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		184	--AvFILLp (padlist);
		185
		186	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
161	av_store (newpadlist, 1, (SV *) newpad);	187	av_store (newpadlist, 1, (SV *)newpad);
162		188
163	av = newAV (); /* will be @_ */	189	return newpadlist;
164	av_extend (av, 0);	190	}
165	av_store (newpad, 0, (SV *) av);
166	AvFLAGS (av) = AVf_REIFY;
167		191
168	for (ix = fpad; ix > 0; ix--)	192	static void
		193	free_padlist (AV *padlist)
		194	{
		195	/* may be during global destruction */
		196	if (SvREFCNT (padlist))
169	{	197	{
170	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	198	I32 i = AvFILLp (padlist);
171	if (namesv && namesv != &PL_sv_undef)	199	while (i >= 0)
172	{	200	{
173	char *name = SvPVX (namesv); /* XXX */	201	SV **svp = av_fetch (padlist, i--, FALSE);
174	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	202	if (svp)
175	{ /* lexical from outside? */
176	npad[ix] = SvREFCNT_inc (ppad[ix]);
177	}	203	{
178	else
179	{ /* our own lexical */
180	SV *sv;	204	SV *sv;
181	if (*name == '&')	205	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
182	sv = SvREFCNT_inc (ppad[ix]);	206	SvREFCNT_dec (sv);
183	else if (*name == '@')	207
184	sv = (SV *) newAV ();	208	SvREFCNT_dec (*svp);
185	else if (*name == '%')
186	sv = (SV *) newHV ();
187	else
188	sv = NEWSV (0, 0);
189	if (!SvPADBUSY (sv))
190	SvPADMY_on (sv);
191	npad[ix] = sv;
192	}	209	}
193	}	210	}
194	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	211
195	{	212	SvREFCNT_dec ((SV*)padlist);
196	npad[ix] = SvREFCNT_inc (ppad[ix]);
197	}
198	else
199	{
200	SV *sv = NEWSV (0, 0);
201	SvPADTMP_on (sv);
202	npad[ix] = sv;
203	}
204	}	213	}
		214	}
205		215
206	#if 0 /* return -ENOTUNDERSTOOD */	216	static int
207	/* Now that vars are all in place, clone nested closures. */	217	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		218	{
		219	AV *padlist;
		220	AV *av = (AV *)mg->mg_obj;
208		221
209	for (ix = fpad; ix > 0; ix--) {	222	/* casting is fun. */
210	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	223	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
211	if (namesv	224	free_padlist (padlist);
212	&& namesv != &PL_sv_undef	225
213	&& !(SvFLAGS(namesv) & SVf_FAKE)	226	SvREFCNT_dec (av);
214	&& *SvPVX(namesv) == '&'	227
215	&& CvCLONE(ppad[ix]))	228	return 0;
216	{	229	}
217	CV *kid = cv_clone((CV*)ppad[ix]);	230
218	SvREFCNT_dec(ppad[ix]);	231	#define PERL_MAGIC_coro PERL_MAGIC_ext
219	CvCLONE_on(kid);	232
220	SvPADMY_on(kid);	233	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
221	npad[ix] = (SV*)kid;	234
222	}	235	/* the next two functions merely cache the padlists */
		236	static void
		237	get_padlist (CV *cv)
		238	{
		239	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		240
		241	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)
		242	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);
		243	else
		244	{
		245	#if 0
		246	/* this is probably cleaner, but also slower? */
		247	CV *cp = Perl_cv_clone (cv);
		248	CvPADLIST (cv) = CvPADLIST (cp);
		249	CvPADLIST (cp) = 0;
		250	SvREFCNT_dec (cp);
		251	#else
		252	CvPADLIST (cv) = coro_clone_padlist (cv);
		253	#endif
		254	}
		255	}
		256
		257	static void
		258	put_padlist (CV *cv)
		259	{
		260	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		261
		262	if (!mg)
		263	{
		264	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		265	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		266	mg->mg_virtual = &vtbl_coro;
		267	mg->mg_obj = (SV *)newAV ();
223	}	268	}
224	#endif
225		269
226	return newpadlist;
227	}
228
229	#ifdef MAY_FLUSH
230	STATIC void
231	free_padlist (AV *padlist)
232	{
233	/* may be during global destruction */
234	if (SvREFCNT(padlist))
235	{
236	I32 i = AvFILLp(padlist);
237	while (i >= 0)
238	{
239	SV **svp = av_fetch(padlist, i--, FALSE);
240	SV *sv = svp ? *svp : Nullsv;
241	if (sv)
242	SvREFCNT_dec(sv);
243	}
244
245	SvREFCNT_dec((SV*)padlist);
246	}
247	}
248	#endif
249
250	/* the next two functions merely cache the padlists */
251	STATIC void
252	get_padlist (CV *cv)
253	{
254	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
255
256	if (he && AvFILLp ((AV *)*he) >= 0)
257	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
258	else
259	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
260	}
261
262	STATIC void
263	put_padlist (CV *cv)
264	{
265	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
266
267	if (SvTYPE (*he) != SVt_PVAV)
268	{
269	SvREFCNT_dec (*he);
270	*he = (SV *)newAV ();
271	}
272
273	av_push ((AV *)*he, (SV *)CvPADLIST (cv));	270	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));
274	}	271	}
275
276	#ifdef MAY_FLUSH
277	STATIC void
278	flush_padlist_cache ()
279	{
280	HV *hv = padlist_cache;
281	padlist_cache = newHV ();
282
283	if (hv_iterinit (hv))
284	{
285	HE *he;
286	AV *padlist;
287
288	while (!!(he = hv_iternext (hv)))
289	{
290	AV *av = (AV *)HeVAL(he);
291
292	/* casting is fun. */
293	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
294	free_padlist (padlist);
295	}
296	}
297
298	SvREFCNT_dec (hv);
299	}
300	#endif
301		272
302	#define SB do {	273	#define SB do {
303	#define SE } while (0)	274	#define SE } while (0)
304		275
305	#define LOAD(state) load_state(aTHX_ (state));	276	#define LOAD(state) load_state((state));
306	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));	277	#define SAVE(state,flags) save_state((state),(flags));
307		278
308	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	279	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE
309		280
310	static void	281	static void
311	load_state(pTHX_ Coro__State c)	282	load_state(Coro__State c)
312	{	283	{
313	PL_dowarn = c->dowarn;	284	PL_dowarn = c->dowarn;
314	PL_in_eval = c->in_eval;	285	PL_in_eval = c->in_eval;
315		286
316	PL_curstackinfo = c->curstackinfo;	287	PL_curstackinfo = c->curstackinfo;
…		…
318	PL_mainstack = c->mainstack;	289	PL_mainstack = c->mainstack;
319	PL_stack_sp = c->stack_sp;	290	PL_stack_sp = c->stack_sp;
320	PL_op = c->op;	291	PL_op = c->op;
321	PL_curpad = c->curpad;	292	PL_curpad = c->curpad;
322	PL_comppad = c->comppad;	293	PL_comppad = c->comppad;
		294	PL_compcv = c->compcv;
323	PL_stack_base = c->stack_base;	295	PL_stack_base = c->stack_base;
324	PL_stack_max = c->stack_max;	296	PL_stack_max = c->stack_max;
325	PL_tmps_stack = c->tmps_stack;	297	PL_tmps_stack = c->tmps_stack;
326	PL_tmps_floor = c->tmps_floor;	298	PL_tmps_floor = c->tmps_floor;
327	PL_tmps_ix = c->tmps_ix;	299	PL_tmps_ix = c->tmps_ix;
…		…
333	PL_scopestack_ix = c->scopestack_ix;	305	PL_scopestack_ix = c->scopestack_ix;
334	PL_scopestack_max = c->scopestack_max;	306	PL_scopestack_max = c->scopestack_max;
335	PL_savestack = c->savestack;	307	PL_savestack = c->savestack;
336	PL_savestack_ix = c->savestack_ix;	308	PL_savestack_ix = c->savestack_ix;
337	PL_savestack_max = c->savestack_max;	309	PL_savestack_max = c->savestack_max;
		310	#if !PERL_VERSION_ATLEAST (5,9,0)
338	PL_retstack = c->retstack;	311	PL_retstack = c->retstack;
339	PL_retstack_ix = c->retstack_ix;	312	PL_retstack_ix = c->retstack_ix;
340	PL_retstack_max = c->retstack_max;	313	PL_retstack_max = c->retstack_max;
		314	#endif
		315	PL_curpm = c->curpm;
341	PL_curcop = c->curcop;	316	PL_curcop = c->curcop;
342	PL_top_env = c->top_env;
343		317
344	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	318	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
345	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	319	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
346	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	320	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
347		321
…		…
356		330
357	if (padlist)	331	if (padlist)
358	{	332	{
359	put_padlist (cv); /* mark this padlist as available */	333	put_padlist (cv); /* mark this padlist as available */
360	CvPADLIST(cv) = padlist;	334	CvPADLIST(cv) = padlist;
361	#ifdef USE_THREADS
362	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
363	#endif
364	}	335	}
365		336
366	++CvDEPTH(cv);	337	++CvDEPTH(cv);
367	}	338	}
368		339
369	PUTBACK;	340	PUTBACK;
370	}	341	}
371	}	342	}
372		343
373	static void	344	static void
374	save_state(pTHX_ Coro__State c, int flags)	345	save_state(Coro__State c, int flags)
375	{	346	{
376	{	347	{
377	dSP;	348	dSP;
378	I32 cxix = cxstack_ix;	349	I32 cxix = cxstack_ix;
379	PERL_CONTEXT *ccstk = cxstack;	350	PERL_CONTEXT *ccstk = cxstack;
…		…
395	if (CxTYPE(cx) == CXt_SUB)	366	if (CxTYPE(cx) == CXt_SUB)
396	{	367	{
397	CV *cv = cx->blk_sub.cv;	368	CV *cv = cx->blk_sub.cv;
398	if (CvDEPTH(cv))	369	if (CvDEPTH(cv))
399	{	370	{
400	#ifdef USE_THREADS
401	/*XPUSHs ((SV *)CvOWNER(cv));*/
402	/*CvOWNER(cv) = 0;*/
403	/*error must unlock this cv etc.. etc...*/
404	#endif
405	EXTEND (SP, CvDEPTH(cv)*2);	371	EXTEND (SP, CvDEPTH(cv)*2);
406		372
407	while (--CvDEPTH(cv))	373	while (--CvDEPTH(cv))
408	{	374	{
409	/* this tells the restore code to increment CvDEPTH */	375	/* this tells the restore code to increment CvDEPTH */
…		…
412	}	378	}
413		379
414	PUSHs ((SV *)CvPADLIST(cv));	380	PUSHs ((SV *)CvPADLIST(cv));
415	PUSHs ((SV *)cv);	381	PUSHs ((SV *)cv);
416		382
417	get_padlist (cv); /* this is a monster */	383	get_padlist (cv);
418	}	384	}
419	}	385	}
420	#ifdef CXt_FORMAT	386	#ifdef CXt_FORMAT
421	else if (CxTYPE(cx) == CXt_FORMAT)	387	else if (CxTYPE(cx) == CXt_FORMAT)
422	{	388	{
…		…
450	c->mainstack = PL_mainstack;	416	c->mainstack = PL_mainstack;
451	c->stack_sp = PL_stack_sp;	417	c->stack_sp = PL_stack_sp;
452	c->op = PL_op;	418	c->op = PL_op;
453	c->curpad = PL_curpad;	419	c->curpad = PL_curpad;
454	c->comppad = PL_comppad;	420	c->comppad = PL_comppad;
		421	c->compcv = PL_compcv;
455	c->stack_base = PL_stack_base;	422	c->stack_base = PL_stack_base;
456	c->stack_max = PL_stack_max;	423	c->stack_max = PL_stack_max;
457	c->tmps_stack = PL_tmps_stack;	424	c->tmps_stack = PL_tmps_stack;
458	c->tmps_floor = PL_tmps_floor;	425	c->tmps_floor = PL_tmps_floor;
459	c->tmps_ix = PL_tmps_ix;	426	c->tmps_ix = PL_tmps_ix;
…		…
465	c->scopestack_ix = PL_scopestack_ix;	432	c->scopestack_ix = PL_scopestack_ix;
466	c->scopestack_max = PL_scopestack_max;	433	c->scopestack_max = PL_scopestack_max;
467	c->savestack = PL_savestack;	434	c->savestack = PL_savestack;
468	c->savestack_ix = PL_savestack_ix;	435	c->savestack_ix = PL_savestack_ix;
469	c->savestack_max = PL_savestack_max;	436	c->savestack_max = PL_savestack_max;
		437	#if !PERL_VERSION_ATLEAST (5,9,0)
470	c->retstack = PL_retstack;	438	c->retstack = PL_retstack;
471	c->retstack_ix = PL_retstack_ix;	439	c->retstack_ix = PL_retstack_ix;
472	c->retstack_max = PL_retstack_max;	440	c->retstack_max = PL_retstack_max;
		441	#endif
		442	c->curpm = PL_curpm;
473	c->curcop = PL_curcop;	443	c->curcop = PL_curcop;
474	c->top_env = PL_top_env;
475	}	444	}
476		445
477	/*	446	/*
478	* allocate various perl stacks. This is an exact copy	447	* allocate various perl stacks. This is an exact copy
479	* of perl.c:init_stacks, except that it uses less memory	448	* of perl.c:init_stacks, except that it uses less memory
480	* on the assumption that coroutines do not usually need	449	* on the (sometimes correct) assumption that coroutines do
481	* a lot of stackspace.	450	* not usually need a lot of stackspace.
482	*/	451	*/
483	STATIC void	452	static void
484	coro_init_stacks (pTHX)	453	coro_init_stacks ()
485	{	454	{
486	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	455	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
487	PL_curstackinfo->si_type = PERLSI_MAIN;	456	PL_curstackinfo->si_type = PERLSI_MAIN;
488	PL_curstack = PL_curstackinfo->si_stack;	457	PL_curstack = PL_curstackinfo->si_stack;
489	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	458	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
…		…
511		480
512	New(54,PL_savestack,96,ANY);	481	New(54,PL_savestack,96,ANY);
513	PL_savestack_ix = 0;	482	PL_savestack_ix = 0;
514	PL_savestack_max = 96;	483	PL_savestack_max = 96;
515		484
		485	#if !PERL_VERSION_ATLEAST (5,9,0)
516	New(54,PL_retstack,8,OP*);	486	New(54,PL_retstack,8,OP*);
517	PL_retstack_ix = 0;	487	PL_retstack_ix = 0;
518	PL_retstack_max = 8;	488	PL_retstack_max = 8;
		489	#endif
519	}	490	}
520		491
521	/*	492	/*
522	* destroy the stacks, the callchain etc...	493	* destroy the stacks, the callchain etc...
523	*/	494	*/
524	STATIC void	495	static void
525	destroy_stacks(pTHX)	496	coro_destroy_stacks()
526	{	497	{
527	if (!IN_DESTRUCT)	498	if (!IN_DESTRUCT)
528	{	499	{
529	/* is this ugly, I ask? */	500	/* is this ugly, I ask? */
530	while (PL_scopestack_ix)	501	LEAVE_SCOPE (0);
531	LEAVE;
532		502
533	/* sure it is, but more important: is it correct?? :/ */	503	/* sure it is, but more important: is it correct?? :/ */
534	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
535	FREETMPS;	504	FREETMPS;
		505
		506	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
536	}	507	}
537		508
538	while (PL_curstackinfo->si_next)	509	while (PL_curstackinfo->si_next)
539	PL_curstackinfo = PL_curstackinfo->si_next;	510	PL_curstackinfo = PL_curstackinfo->si_next;
540		511
541	while (PL_curstackinfo)	512	while (PL_curstackinfo)
542	{	513	{
543	PERL_SI *p = PL_curstackinfo->si_prev;	514	PERL_SI *p = PL_curstackinfo->si_prev;
544		515
545	{	516	{ /*D*//*remove*/
546	dSP;	517	dSP;
547	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	518	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
548	PUTBACK; /* possibly superfluous */	519	PUTBACK; /* possibly superfluous */
549	}	520	}
550		521
551	if (!IN_DESTRUCT)	522	if (!IN_DESTRUCT)
552	{	523	{
553	dounwind(-1);	524	dounwind (-1);/*D*//*remove*/
554	SvREFCNT_dec(PL_curstackinfo->si_stack);	525	SvREFCNT_dec (PL_curstackinfo->si_stack);
555	}	526	}
556		527
557	Safefree(PL_curstackinfo->si_cxstack);	528	Safefree (PL_curstackinfo->si_cxstack);
558	Safefree(PL_curstackinfo);	529	Safefree (PL_curstackinfo);
559	PL_curstackinfo = p;	530	PL_curstackinfo = p;
560	}	531	}
561		532
562	Safefree(PL_tmps_stack);	533	Safefree (PL_tmps_stack);
563	Safefree(PL_markstack);	534	Safefree (PL_markstack);
564	Safefree(PL_scopestack);	535	Safefree (PL_scopestack);
565	Safefree(PL_savestack);	536	Safefree (PL_savestack);
		537	#if !PERL_VERSION_ATLEAST (5,9,0)
566	Safefree(PL_retstack);	538	Safefree (PL_retstack);
567	}
568
569	static void
570	allocate_stack (Coro__State ctx, int alloc)
571	{
572	coro_stack *stack;
573
574	New (0, stack, 1, coro_stack);
575
576	stack->refcnt = 1;
577	stack->usecnt = 1;
578	stack->gencnt = ctx->gencnt = 0;
579	if (alloc)
580	{
581	#if HAVE_MMAP
582	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
583	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
584	if (stack->sptr == (void *)-1)
585	#endif	539	#endif
586	{
587	/*FIXME*//*D*//* reasonable stack size! */
588	stack->ssize = -4096 * sizeof (long);
589	New (0, stack->sptr, 4096, long);
590	}
591	}
592	else
593	stack->sptr = 0;
594
595	ctx->stack = stack;
596	}	540	}
597		541
598	static void	542	static void
599	deallocate_stack (Coro__State ctx)	543	setup_coro (struct coro *coro)
600	{
601	coro_stack *stack = ctx->stack;
602
603	ctx->stack = 0;
604
605	if (stack)
606	{
607	if (!--stack->refcnt)
608	{
609	#ifdef HAVE_MMAP
610	if (stack->ssize > 0 && stack->sptr)
611	munmap (stack->sptr, stack->ssize);
612	else
613	#endif
614	Safefree (stack->sptr);
615
616	Safefree (stack);
617	}
618	else if (ctx->gencnt == stack->gencnt)
619	--stack->usecnt;
620	}
621	}
622
623	static void
624	setup_coro (void *arg)
625	{	544	{
626	/*	545	/*
627	* emulate part of the perl startup here.	546	* emulate part of the perl startup here.
628	*/	547	*/
629	dSP;
630	Coro__State ctx = (Coro__State)arg;
631	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
632		548
633	coro_init_stacks (aTHX);	549	coro_init_stacks ();
		550
634	/*PL_curcop = 0;*/	551	PL_curcop = 0;
635	/*PL_in_eval = PL_in_eval;*/ /* inherit */	552	PL_in_eval = 0;
		553	PL_curpm = 0;
		554
		555	{
		556	dSP;
		557	LOGOP myop;
		558
		559	/* I have no idea why this is needed, but it is */
		560	PUSHMARK (SP);
		561
636	SvREFCNT_dec (GvAV (PL_defgv));	562	SvREFCNT_dec (GvAV (PL_defgv));
637	GvAV (PL_defgv) = ctx->args; ctx->args = 0;	563	GvAV (PL_defgv) = coro->args; coro->args = 0;
638		564
639	SPAGAIN;
640
641	if (ctx->stack)
642	{
643	ctx->cursp = 0;
644
645	PUSHMARK(SP);
646	PUTBACK;
647	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
648
649	if (SvTRUE (ERRSV))
650	croak (NULL);
651	else
652	croak ("FATAL: CCTXT coroutine returned!");
653	}
654	else
655	{
656	UNOP myop;
657
658	PL_op = (OP *)&myop;
659
660	Zero(&myop, 1, UNOP);	565	Zero (&myop, 1, LOGOP);
661	myop.op_next = Nullop;	566	myop.op_next = Nullop;
662	myop.op_flags = OPf_WANT_VOID;	567	myop.op_flags = OPf_WANT_VOID;
663		568
		569	PL_op = (OP *)&myop;
		570
664	PUSHMARK(SP);	571	PUSHMARK (SP);
665	XPUSHs (sub_init);	572	XPUSHs ((SV *)get_cv ("Coro::State::coro_init", FALSE));
666	/*
667	* the next line is slightly wrong, as PL_op->op_next
668	* is actually being executed so we skip the first op.
669	* that doesn't matter, though, since it is only
670	* pp_nextstate and we never return...
671	* ah yes, and I don't care anyways ;)
672	*/
673	PUTBACK;	573	PUTBACK;
674	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	574	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
675	SPAGAIN;	575	SPAGAIN;
676		576
677	ENTER; /* necessary e.g. for dounwind */	577	ENTER; /* necessary e.g. for dounwind */
678	}	578	}
679	}	579	}
680		580
681	static void	581	static void
682	continue_coro (void *arg)	582	free_coro_mortal ()
683	{	583	{
684	/*
685	* this is a _very_ stripped down perl interpreter ;)
686	*/
687	Coro__State ctx = (Coro__State)arg;
688	JMPENV coro_start_env;
689
690	PL_top_env = &ctx->start_env;
691
692	ctx->cursp = 0;
693	PL_op = PL_op->op_next;
694	CALLRUNOPS(aTHX);
695
696	abort ();
697	}
698
699	STATIC void
700	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
701	{
702	dSTACKLEVEL;
703	static struct coro *xnext;
704
705	if (prev != next)
706	{
707	xnext = next;
708
709	if (next->mainstack)
710	{
711	SAVE (prev, flags);
712	LOAD (next);
713
714	/* mark this state as in-use */
715	next->mainstack = 0;
716	next->tmps_ix = -2;
717
718	/* stacklevel changed? if yes, grab the stack for us! */
719	if (flags & TRANSFER_SAVE_CCTXT)
720	{
721	if (!prev->stack)
722	allocate_stack (prev, 0);
723	else if (prev->cursp != stacklevel
724	&& prev->stack->usecnt > 1)
725	{
726	prev->gencnt = ++prev->stack->gencnt;
727	prev->stack->usecnt = 1;
728	}
729
730	/* has our stack been invalidated? */
731	if (next->stack && next->stack->gencnt != next->gencnt)
732	{
733	deallocate_stack (next);
734	allocate_stack (next, 1);
735	coro_create (&(next->stack->cctx),
736	continue_coro, (void *)next,
737	next->stack->sptr, labs (next->stack->ssize));
738	}
739
740	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
741	/* don't add any code here */
742	}
743
744	}
745	else if (next->tmps_ix == -2)
746	croak ("tried to transfer to running coroutine");
747	else
748	{
749	SAVE (prev, -1); /* first get rid of the old state */
750
751	if (flags & TRANSFER_SAVE_CCTXT)
752	{
753	if (!prev->stack)
754	allocate_stack (prev, 0);
755
756	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
757	{
758	PL_top_env = &next->start_env;
759
760	setup_coro (next);
761
762	prev->stack->refcnt++;
763	prev->stack->usecnt++;
764	next->stack = prev->stack;
765	next->gencnt = prev->gencnt;
766	}
767	else
768	{
769	assert (!next->stack);
770	allocate_stack (next, 1);
771	coro_create (&(next->stack->cctx),
772	setup_coro, (void *)next,
773	next->stack->sptr, labs (next->stack->ssize));
774	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
775	/* don't add any code here */
776	}
777	}
778	else
779	setup_coro (next);
780	}
781
782	/*
783	* xnext is now either prev or next, depending on wether
784	* we switched the c stack or not. that's why I use a global
785	* variable, that should become thread-specific at one point.
786	*/
787	xnext->cursp = stacklevel;
788	}
789
790	if (coro_mortal)	584	if (coro_mortal)
791	{	585	{
792	SvREFCNT_dec (coro_mortal);	586	SvREFCNT_dec (coro_mortal);
793	coro_mortal = 0;	587	coro_mortal = 0;
794	}	588	}
795	}	589	}
796		590
797	#define SV_CORO(sv,func) \	591	static void NOINLINE
798	do { \	592	prepare_cctx (coro_stack *cctx)
799	if (SvROK (sv)) \	593	{
800	sv = SvRV (sv); \	594	dSP;
801	\	595	LOGOP myop;
802	if (SvTYPE(sv) == SVt_PVHV) \
803	{ \
804	HE *he = hv_fetch_ent((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
805	\
806	if (!he) \
807	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
808	\
809	(sv) = SvRV (HeVAL(he)); \
810	} \
811	\
812	/* must also be changed inside Coro::Cont::yield */ \
813	if (!SvOBJECT(sv) || SvSTASH(sv) != coro_state_stash) \
814	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
815	\
816	} while(0)
817		596
818	#define SvSTATE(sv) (struct coro *)SvIV (sv)	597	Zero (&myop, 1, LOGOP);
		598	myop.op_next = PL_op;
		599	myop.op_flags = OPf_WANT_VOID;
819		600
		601	sv_setiv (get_sv ("Coro::State::cctx_stack", FALSE), PTR2IV (cctx));
		602
		603	PUSHMARK (SP);
		604	XPUSHs ((SV *)get_cv ("Coro::State::cctx_init", FALSE));
		605	PUTBACK;
		606	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
		607	SPAGAIN;
		608	}
		609
		610	static void
		611	coro_run (void *arg)
		612	{
		613	/* coro_run is the alternative epilogue of transfer() */
		614	UNLOCK;
		615
		616	/*
		617	* this is a _very_ stripped down perl interpreter ;)
		618	*/
		619	PL_top_env = &PL_start_env;
		620	/* inject call to cctx_init */
		621	prepare_cctx ((coro_stack *)arg);
		622
		623	/* somebody will hit me for both perl_run and PL_restartop */
		624	perl_run (PL_curinterp);
		625
		626	fputs ("FATAL: C coroutine fell over the edge of the world, aborting.\n", stderr);
		627	abort ();
		628	}
		629
		630	static coro_stack *
		631	stack_new ()
		632	{
		633	coro_stack *stack;
		634
		635	New (0, stack, 1, coro_stack);
		636
		637	#if HAVE_MMAP
		638
		639	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		640	/* mmap suppsedly does allocate-on-write for us */
		641	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		642
		643	if (stack->sptr == (void *)-1)
		644	{
		645	perror ("FATAL: unable to mmap stack for coroutine");
		646	_exit (EXIT_FAILURE);
		647	}
		648
		649	# if STACKGUARD
		650	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		651	# endif
		652
		653	#else
		654
		655	stack->ssize = STACKSIZE * (long)sizeof (long);
		656	New (0, stack->sptr, STACKSIZE, long);
		657
		658	if (!stack->sptr)
		659	{
		660	perror (stderr, "FATAL: unable to malloc stack for coroutine");
		661	_exit (EXIT_FAILURE);
		662	}
		663
		664	#endif
		665
		666	coro_create (&stack->cctx, coro_run, (void *)stack, stack->sptr, stack->ssize);
		667
		668	return stack;
		669	}
		670
		671	static void
		672	stack_free (coro_stack *stack)
		673	{
		674	if (!stack)
		675	return;
		676
		677	#if HAVE_MMAP
		678	munmap (stack->sptr, stack->ssize);
		679	#else
		680	Safefree (stack->sptr);
		681	#endif
		682
		683	Safefree (stack);
		684	}
		685
		686	static coro_stack *stack_first;
		687	static int cctx_count, cctx_idle;
		688
		689	static coro_stack *
		690	stack_get ()
		691	{
		692	coro_stack *stack;
		693
		694	if (stack_first)
		695	{
		696	--cctx_idle;
		697	stack = stack_first;
		698	stack_first = stack->next;
		699	}
		700	else
		701	{
		702	++cctx_count;
		703	stack = stack_new ();
		704	PL_op = PL_op->op_next;
		705	}
		706
		707	return stack;
		708	}
		709
		710	static void
		711	stack_put (coro_stack *stack)
		712	{
		713	++cctx_idle;
		714	stack->next = stack_first;
		715	stack_first = stack;
		716	}
		717
		718	/* never call directly, always through the coro_state_transfer global variable */
		719	static void NOINLINE
		720	transfer (struct coro *prev, struct coro *next, int flags)
		721	{
		722	dSTACKLEVEL;
		723
		724	/* sometimes transfer is only called to set idle_sp */
		725	if (flags == TRANSFER_SET_STACKLEVEL)
		726	((coro_stack *)prev)->idle_sp = STACKLEVEL;
		727	else if (prev != next)
		728	{
		729	coro_stack *prev__stack;
		730
		731	LOCK;
		732
		733	if (next->mainstack)
		734	{
		735	/* coroutine already started */
		736	SAVE (prev, flags);
		737	LOAD (next);
		738	}
		739	else
		740	{
		741	/* need to start coroutine */
		742	/* first get rid of the old state */
		743	SAVE (prev, -1);
		744	/* setup coroutine call */
		745	setup_coro (next);
		746	/* need a stack */
		747	next->stack = 0;
		748	}
		749
		750	if (!prev->stack)
		751	/* create a new empty context */
		752	Newz (0, prev->stack, 1, coro_stack);
		753
		754	prev__stack = prev->stack;
		755
		756	/* possibly "free" the stack */
		757	if (prev__stack->idle_sp == STACKLEVEL)
		758	{
		759	stack_put (prev__stack);
		760	prev->stack = 0;
		761	}
		762
		763	if (!next->stack)
		764	next->stack = stack_get ();
		765
		766	if (prev__stack != next->stack)
		767	{
		768	prev__stack->top_env = PL_top_env;
		769	PL_top_env = next->stack->top_env;
		770	coro_transfer (&prev__stack->cctx, &next->stack->cctx);
		771	}
		772
		773	free_coro_mortal ();
		774
		775	UNLOCK;
		776	}
		777	}
		778
		779	struct transfer_args
		780	{
		781	struct coro *prev, *next;
		782	int flags;
		783	};
		784
		785	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		786
		787	static void
		788	coro_state_destroy (struct coro *coro)
		789	{
		790	if (coro->refcnt--)
		791	return;
		792
		793	if (coro->mainstack && coro->mainstack != main_mainstack)
		794	{
		795	struct coro temp;
		796
		797	SAVE ((&temp), TRANSFER_SAVE_ALL);
		798	LOAD (coro);
		799
		800	coro_destroy_stacks ();
		801
		802	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		803
		804	coro->mainstack = 0;
		805	}
		806
		807	stack_free (coro->stack);
		808	SvREFCNT_dec (coro->args);
		809	Safefree (coro);
		810	}
		811
820	static void	812	static int
		813	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		814	{
		815	struct coro *coro = (struct coro *)mg->mg_ptr;
		816	mg->mg_ptr = 0;
		817
		818	coro_state_destroy (coro);
		819
		820	return 0;
		821	}
		822
		823	static int
		824	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		825	{
		826	struct coro *coro = (struct coro *)mg->mg_ptr;
		827
		828	++coro->refcnt;
		829
		830	return 0;
		831	}
		832
		833	static MGVTBL coro_state_vtbl = {
		834	0, 0, 0, 0,
		835	coro_state_clear,
		836	0,
		837	#ifdef MGf_DUP
		838	coro_state_dup,
		839	#else
		840	# define MGf_DUP 0
		841	#endif
		842	};
		843
		844	static struct coro *
		845	SvSTATE (SV *coro)
		846	{
		847	HV *stash;
		848	MAGIC *mg;
		849
		850	if (SvROK (coro))
		851	coro = SvRV (coro);
		852
		853	stash = SvSTASH (coro);
		854	if (stash != coro_stash && stash != coro_state_stash)
		855	{
		856	/* very slow, but rare, check */
		857	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		858	croak ("Coro::State object required");
		859	}
		860
		861	mg = SvMAGIC (coro);
		862	assert (mg->mg_type == PERL_MAGIC_ext);
		863	return (struct coro *)mg->mg_ptr;
		864	}
		865
		866	static void
		867	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		868	{
		869	ta->prev = SvSTATE (prev);
		870	ta->next = SvSTATE (next);
		871	ta->flags = flags;
		872	}
		873
		874	static void
821	api_transfer(pTHX_ SV *prev, SV *next, int flags)	875	api_transfer (SV *prev, SV *next, int flags)
822	{	876	{
823	SV_CORO (prev, "Coro::transfer");	877	dTHX;
824	SV_CORO (next, "Coro::transfer");	878	struct transfer_args ta;
825		879
826	transfer(aTHX_ SvSTATE(prev), SvSTATE(next), flags);	880	prepare_transfer (&ta, prev, next, flags);
		881	TRANSFER (ta);
827	}	882	}
828		883
829	/** Coro ********************************************************************/	884	/** Coro ********************************************************************/
830		885
831	#define PRIO_MAX 3	886	#define PRIO_MAX 3
…		…
835	#define PRIO_IDLE -3	890	#define PRIO_IDLE -3
836	#define PRIO_MIN -4	891	#define PRIO_MIN -4
837		892
838	/* for Coro.pm */	893	/* for Coro.pm */
839	static GV *coro_current, *coro_idle;	894	static GV *coro_current, *coro_idle;
840	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	895	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
841	static int coro_nready;	896	static int coro_nready;
842		897
843	static void	898	static void
844	coro_enq (SV *sv)	899	coro_enq (SV *sv)
845	{	900	{
		901	int prio;
		902
846	if (SvTYPE (sv) == SVt_PVHV)	903	if (SvTYPE (sv) != SVt_PVHV)
847	{
848	SV **xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
849	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
850
851	prio = prio > PRIO_MAX ? PRIO_MAX
852	: prio < PRIO_MIN ? PRIO_MIN
853	: prio;
854
855	av_push (coro_ready [prio - PRIO_MIN], sv);
856	coro_nready++;
857
858	return;
859	}
860
861	croak ("Coro::ready tried to enqueue something that is not a coroutine");	904	croak ("Coro::ready tried to enqueue something that is not a coroutine");
		905
		906	prio = SvSTATE (sv)->prio;
		907
		908	av_push (coro_ready [prio - PRIO_MIN], sv);
		909	coro_nready++;
862	}	910	}
863		911
864	static SV *	912	static SV *
865	coro_deq (int min_prio)	913	coro_deq (int min_prio)
866	{	914	{
…		…
869	min_prio -= PRIO_MIN;	917	min_prio -= PRIO_MIN;
870	if (min_prio < 0)	918	if (min_prio < 0)
871	min_prio = 0;	919	min_prio = 0;
872		920
873	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	921	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
874	if (av_len (coro_ready[prio]) >= 0)	922	if (AvFILLp (coro_ready [prio]) >= 0)
875	{	923	{
876	coro_nready--;	924	coro_nready--;
877	return av_shift (coro_ready[prio]);	925	return av_shift (coro_ready [prio]);
878	}	926	}
879		927
880	return 0;	928	return 0;
881	}	929	}
882		930
883	static void	931	static void
884	api_ready (SV *coro)	932	api_ready (SV *coro)
885	{	933	{
		934	dTHX;
		935
886	if (SvROK (coro))	936	if (SvROK (coro))
887	coro = SvRV (coro);	937	coro = SvRV (coro);
888		938
		939	LOCK;
889	coro_enq (SvREFCNT_inc (coro));	940	coro_enq (SvREFCNT_inc (coro));
		941	UNLOCK;
		942	}
		943
		944	static void
		945	prepare_schedule (struct transfer_args *ta)
		946	{
		947	SV *current, *prev, *next;
		948
		949	current = GvSV (coro_current);
		950
		951	for (;;)
		952	{
		953	LOCK;
		954	next = coro_deq (PRIO_MIN);
		955	UNLOCK;
		956
		957	if (next)
		958	break;
		959
		960	{
		961	dSP;
		962
		963	ENTER;
		964	SAVETMPS;
		965
		966	PUSHMARK (SP);
		967	PUTBACK;
		968	call_sv (GvSV (coro_idle), G_DISCARD);
		969
		970	FREETMPS;
		971	LEAVE;
		972	}
		973	}
		974
		975	prev = SvRV (current);
		976	SvRV (current) = next;
		977
		978	/* free this only after the transfer */
		979	LOCK;
		980	free_coro_mortal ();
		981	UNLOCK;
		982	coro_mortal = prev;
		983
		984	ta->prev = SvSTATE (prev);
		985	ta->next = SvSTATE (next);
		986	ta->flags = TRANSFER_SAVE_ALL;
		987	}
		988
		989	static void
		990	prepare_cede (struct transfer_args *ta)
		991	{
		992	LOCK;
		993	coro_enq (SvREFCNT_inc (SvRV (GvSV (coro_current))));
		994	UNLOCK;
		995
		996	prepare_schedule (ta);
890	}	997	}
891		998
892	static void	999	static void
893	api_schedule (void)	1000	api_schedule (void)
894	{	1001	{
895	SV *prev, *next;	1002	dTHX;
		1003	struct transfer_args ta;
896		1004
897	prev = SvRV (GvSV (coro_current));	1005	prepare_schedule (&ta);
898	next = coro_deq (PRIO_MIN);	1006	TRANSFER (ta);
899
900	if (!next)
901	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
902
903	/* free this only after the transfer */
904	coro_mortal = prev;
905	SV_CORO (prev, "Coro::schedule");
906
907	SvRV (GvSV (coro_current)) = next;
908
909	SV_CORO (next, "Coro::schedule");
910
911	transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
912	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
913	}	1007	}
914		1008
915	static void	1009	static void
916	api_cede (void)	1010	api_cede (void)
917	{	1011	{
918	coro_enq (SvREFCNT_inc (SvRV (GvSV (coro_current))));	1012	dTHX;
		1013	struct transfer_args ta;
919		1014
920	api_schedule ();	1015	prepare_cede (&ta);
		1016	TRANSFER (ta);
921	}	1017	}
922		1018
923	MODULE = Coro::State PACKAGE = Coro::State	1019	MODULE = Coro::State PACKAGE = Coro::State
924		1020
925	PROTOTYPES: ENABLE	1021	PROTOTYPES: DISABLE
926		1022
927	BOOT:	1023	BOOT:
928	{ /* {} necessary for stoopid perl-5.6.x */	1024	{
929	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1025	#ifdef USE_ITHREADS
930	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1026	MUTEX_INIT (&coro_mutex);
		1027	#endif
		1028	BOOT_PAGESIZE;
		1029
931	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1030	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
932		1031
933	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1032	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
934	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1033	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
935	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1034	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
936	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
937
938	if (!padlist_cache)
939	padlist_cache = newHV ();
940		1035
941	main_mainstack = PL_mainstack;	1036	main_mainstack = PL_mainstack;
942		1037
943	coroapi.ver = CORO_API_VERSION;	1038	coroapi.ver = CORO_API_VERSION;
944	coroapi.transfer = api_transfer;	1039	coroapi.transfer = api_transfer;
945	}
946		1040
947	Coro::State	1041	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
948	_newprocess(args)	1042	}
949	SV * args	1043
950	PROTOTYPE: $	1044	SV *
		1045	new (char *klass, ...)
951	CODE:	1046	CODE:
952	Coro__State coro;	1047	{
		1048	struct coro *coro;
		1049	HV *hv;
		1050	int i;
953		1051
954	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
955	croak ("Coro::State::_newprocess expects an arrayref");
956
957	Newz (0, coro, 1, struct coro);	1052	Newz (0, coro, 1, struct coro);
		1053	coro->args = newAV ();
958		1054
959	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1055	hv = newHV ();
		1056	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
		1057	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		1058
		1059	for (i = 1; i < items; i++)
		1060	av_push (coro->args, newSVsv (ST (i)));
		1061
960	coro->mainstack = 0; /* actual work is done inside transfer */	1062	/*coro->mainstack = 0; *//*actual work is done inside transfer */
961	coro->stack = 0;	1063	/*coro->stack = 0;*/
962		1064	}
963	/* same as JMPENV_BOOTSTRAP */
964	/* we might be able to recycle start_env, but safe is safe */
965	//Zero(&coro->start_env, 1, JMPENV);
966	coro->start_env.je_ret = -1;
967	coro->start_env.je_mustcatch = TRUE;
968
969	RETVAL = coro;
970	OUTPUT:	1065	OUTPUT:
971	RETVAL	1066	RETVAL
972		1067
973	void	1068	void
974	transfer(prev, next, flags)	1069	_set_stacklevel (...)
975	SV *prev	1070	ALIAS:
976	SV *next	1071	Coro::State::transfer = 1
977	int flags	1072	Coro::schedule = 2
978	PROTOTYPE: @	1073	Coro::cede = 3
		1074	Coro::Cont::yield = 4
979	CODE:	1075	CODE:
980	PUTBACK;	1076	{
981	SV_CORO (next, "Coro::transfer");	1077	struct transfer_args ta;
982	SV_CORO (prev, "Coro::transfer");	1078
983	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1079	switch (ix)
984	SPAGAIN;	1080	{
		1081	case 0:
		1082	ta.prev = (struct coro *)INT2PTR (coro_stack *, SvIV (ST (0)));
		1083	ta.next = 0;
		1084	ta.flags = TRANSFER_SET_STACKLEVEL;
		1085	break;
		1086
		1087	case 1:
		1088	if (items != 3)
		1089	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);
		1090
		1091	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1092	break;
		1093
		1094	case 2:
		1095	prepare_schedule (&ta);
		1096	break;
		1097
		1098	case 3:
		1099	prepare_cede (&ta);
		1100	break;
		1101
		1102	case 4:
		1103	{
		1104	SV *yieldstack;
		1105	SV *sv;
		1106	AV *defav = GvAV (PL_defgv);
		1107
		1108	yieldstack = *hv_fetch (
		1109	(HV *)SvRV (GvSV (coro_current)),
		1110	"yieldstack", sizeof ("yieldstack") - 1,
		1111	0
		1112	);
		1113
		1114	/* set up @_ -- ugly */
		1115	av_clear (defav);
		1116	av_fill (defav, items - 1);
		1117	while (items--)
		1118	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1119
		1120	sv = av_pop ((AV *)SvRV (yieldstack));
		1121	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1122	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1123	ta.flags = 0;
		1124	SvREFCNT_dec (sv);
		1125	}
		1126	break;
		1127
		1128	}
		1129
		1130	TRANSFER (ta);
		1131	}
985		1132
986	void	1133	void
987	DESTROY(coro)	1134	_clone_state_from (SV *dst, SV *src)
988	Coro::State coro	1135	CODE:
989	CODE:	1136	{
		1137	struct coro *coro_src = SvSTATE (src);
990		1138
991	if (coro->mainstack && coro->mainstack != main_mainstack)	1139	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
992	{
993	struct coro temp;
994		1140
995	PUTBACK;	1141	++coro_src->refcnt;
996	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1142	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
997	LOAD(aTHX_ coro);	1143	}
998	SPAGAIN;
999
1000	destroy_stacks (aTHX);
1001
1002	LOAD((&temp)); /* this will get rid of defsv etc.. */
1003	SPAGAIN;
1004
1005	coro->mainstack = 0;
1006	}
1007
1008	deallocate_stack (coro);
1009	SvREFCNT_dec (coro->args);
1010	Safefree (coro);
1011		1144
1012	void	1145	void
1013	flush()
1014	CODE:
1015	#ifdef MAY_FLUSH
1016	flush_padlist_cache ();
1017	#endif
1018
1019	void
1020	_exit(code)	1146	_exit (code)
1021	int code	1147	int code
1022	PROTOTYPE: $	1148	PROTOTYPE: $
1023	CODE:	1149	CODE:
1024	#if defined(__GLIBC__) || _POSIX_C_SOURCE
1025	_exit (code);	1150	_exit (code);
1026	#else
1027	signal (SIGTERM, SIG_DFL);
1028	raise (SIGTERM);
1029	exit (code);
1030	#endif
1031
1032	MODULE = Coro::State PACKAGE = Coro::Cont
1033
1034	# this is slightly dirty (should expose a c-level api)
1035
1036	void
1037	yield(...)
1038	PROTOTYPE: @
1039	CODE:
1040	static SV *returnstk;
1041	SV *sv;
1042	AV *defav = GvAV (PL_defgv);
1043	struct coro *prev, *next;
1044
1045	if (!returnstk)
1046	returnstk = SvRV ((SV *)get_sv ("Coro::Cont::return", FALSE));
1047
1048	/* set up @_ -- ugly */
1049	av_clear (defav);
1050	av_fill (defav, items - 1);
1051	while (items--)
1052	av_store (defav, items, SvREFCNT_inc (ST(items)));
1053
1054	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
1055	sv = av_pop ((AV *)SvRV (returnstk));
1056	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
1057	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
1058	SvREFCNT_dec (sv);
1059
1060	transfer(aTHX_ prev, next, 0);
1061		1151
1062	MODULE = Coro::State PACKAGE = Coro	1152	MODULE = Coro::State PACKAGE = Coro
1063		1153
1064	# this is slightly dirty (should expose a c-level api)
1065
1066	BOOT:	1154	BOOT:
1067	{	1155	{
1068	int i;	1156	int i;
		1157
1069	HV *stash = gv_stashpv ("Coro", TRUE);	1158	coro_stash = gv_stashpv ("Coro", TRUE);
1070		1159
1071	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1160	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1072	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1161	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1073	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1162	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1074	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1163	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1075	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1164	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1076	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1165	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1077		1166
1078	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1167	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1079	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1168	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1080		1169
1081	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1170	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
…		…
1089	coroapi.ready = api_ready;	1178	coroapi.ready = api_ready;
1090	coroapi.nready = &coro_nready;	1179	coroapi.nready = &coro_nready;
1091	coroapi.current = coro_current;	1180	coroapi.current = coro_current;
1092		1181
1093	GCoroAPI = &coroapi;	1182	GCoroAPI = &coroapi;
1094	sv_setiv(sv, (IV)&coroapi);	1183	sv_setiv (sv, (IV)&coroapi);
1095	SvREADONLY_on(sv);	1184	SvREADONLY_on (sv);
1096	}	1185	}
1097	}	1186	}
1098		1187
		1188	int
		1189	prio (Coro::State coro, int newprio = 0)
		1190	ALIAS:
		1191	nice = 1
		1192	CODE:
		1193	{
		1194	RETVAL = coro->prio;
		1195
		1196	if (items > 1)
		1197	{
		1198	if (ix)
		1199	newprio += coro->prio;
		1200
		1201	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1202	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1203
		1204	coro->prio = newprio;
		1205	}
		1206	}
		1207
1099	void	1208	void
1100	ready(self)	1209	ready (SV *self)
1101	SV * self
1102	PROTOTYPE: $	1210	PROTOTYPE: $
1103	CODE:	1211	CODE:
1104	api_ready (self);	1212	api_ready (self);
1105		1213
1106	int	1214	int
1107	nready(...)	1215	nready (...)
1108	PROTOTYPE:	1216	PROTOTYPE:
1109	CODE:	1217	CODE:
1110	RETVAL = coro_nready;	1218	RETVAL = coro_nready;
1111	OUTPUT:	1219	OUTPUT:
1112	RETVAL	1220	RETVAL
1113		1221
		1222	MODULE = Coro::State PACKAGE = Coro::AIO
		1223
		1224	SV *
		1225	_get_state ()
		1226	CODE:
		1227	{
		1228	struct {
		1229	int errorno;
		1230	int laststype;
		1231	int laststatval;
		1232	Stat_t statcache;
		1233	} data;
		1234
		1235	data.errorno = errno;
		1236	data.laststype = PL_laststype;
		1237	data.laststatval = PL_laststatval;
		1238	data.statcache = PL_statcache;
		1239
		1240	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1241	}
		1242	OUTPUT:
		1243	RETVAL
		1244
1114	void	1245	void
1115	schedule(...)	1246	_set_state (char *data_)
1116	PROTOTYPE:	1247	PROTOTYPE: $
1117	CODE:	1248	CODE:
1118	api_schedule ();	1249	{
		1250	struct {
		1251	int errorno;
		1252	int laststype;
		1253	int laststatval;
		1254	Stat_t statcache;
		1255	} *data = (void *)data_;
1119		1256
1120	void	1257	errno = data->errorno;
1121	cede(...)	1258	PL_laststype = data->laststype;
1122	PROTOTYPE:	1259	PL_laststatval = data->laststatval;
1123	CODE:	1260	PL_statcache = data->statcache;
1124	api_cede ();	1261	}
1125

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