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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.47 by pcg, Sat Nov 15 03:53:10 2003 UTC vs.
Revision 1.102 by root, Mon Nov 27 01:28:03 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	* still there is a memleak of 128 bytes...
524	*/	494	*/
525	STATIC void	495	static void
526	destroy_stacks(pTHX)	496	coro_destroy_stacks()
527	{	497	{
528	if (!IN_DESTRUCT)	498	if (!IN_DESTRUCT)
529	{	499	{
530	/* is this ugly, I ask? */	500	/* is this ugly, I ask? */
531	while (PL_scopestack_ix)	501	LEAVE_SCOPE (0);
532	LEAVE;
533		502
534	/* sure it is, but more important: is it correct?? :/ */	503	/* sure it is, but more important: is it correct?? :/ */
535	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
536	FREETMPS;	504	FREETMPS;
		505
		506	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
537	}	507	}
538		508
539	while (PL_curstackinfo->si_next)	509	while (PL_curstackinfo->si_next)
540	PL_curstackinfo = PL_curstackinfo->si_next;	510	PL_curstackinfo = PL_curstackinfo->si_next;
541		511
542	while (PL_curstackinfo)	512	while (PL_curstackinfo)
543	{	513	{
544	PERL_SI *p = PL_curstackinfo->si_prev;	514	PERL_SI *p = PL_curstackinfo->si_prev;
545		515
546	{	516	{ /*D*//*remove*/
547	dSP;	517	dSP;
548	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	518	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
549	PUTBACK; /* possibly superfluous */	519	PUTBACK; /* possibly superfluous */
550	}	520	}
551		521
552	if (!IN_DESTRUCT)	522	if (!IN_DESTRUCT)
553	{	523	{
554	dounwind(-1);	524	dounwind (-1);/*D*//*remove*/
555	SvREFCNT_dec(PL_curstackinfo->si_stack);	525	SvREFCNT_dec (PL_curstackinfo->si_stack);
556	}	526	}
557		527
558	Safefree(PL_curstackinfo->si_cxstack);	528	Safefree (PL_curstackinfo->si_cxstack);
559	Safefree(PL_curstackinfo);	529	Safefree (PL_curstackinfo);
560	PL_curstackinfo = p;	530	PL_curstackinfo = p;
561	}	531	}
562		532
563	Safefree(PL_tmps_stack);	533	Safefree (PL_tmps_stack);
564	Safefree(PL_markstack);	534	Safefree (PL_markstack);
565	Safefree(PL_scopestack);	535	Safefree (PL_scopestack);
566	Safefree(PL_savestack);	536	Safefree (PL_savestack);
		537	#if !PERL_VERSION_ATLEAST (5,9,0)
567	Safefree(PL_retstack);	538	Safefree (PL_retstack);
568	}
569
570	static void
571	allocate_stack (Coro__State ctx, int alloc)
572	{
573	coro_stack *stack;
574
575	New (0, stack, 1, coro_stack);
576
577	stack->refcnt = 1;
578	stack->usecnt = 1;
579	stack->gencnt = ctx->gencnt = 0;
580	if (alloc)
581	{
582	#if HAVE_MMAP
583	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
584	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
585	if (stack->sptr == (void *)-1)
586	#endif	539	#endif
587	{
588	/*FIXME*//*D*//* reasonable stack size! */
589	stack->ssize = -4096 * sizeof (long);
590	New (0, stack->sptr, 4096, long);
591	}
592	}
593	else
594	stack->sptr = 0;
595
596	ctx->stack = stack;
597	}	540	}
598		541
599	static void	542	static void
600	deallocate_stack (Coro__State ctx)	543	setup_coro (struct coro *coro)
601	{
602	coro_stack *stack = ctx->stack;
603
604	ctx->stack = 0;
605
606	if (stack)
607	{
608	if (!--stack->refcnt)
609	{
610	#ifdef HAVE_MMAP
611	if (stack->ssize > 0 && stack->sptr)
612	munmap (stack->sptr, stack->ssize);
613	else
614	#endif
615	Safefree (stack->sptr);
616
617	Safefree (stack);
618	}
619	else if (ctx->gencnt == stack->gencnt)
620	--stack->usecnt;
621	}
622	}
623
624	static void
625	setup_coro (void *arg)
626	{	544	{
627	/*	545	/*
628	* emulate part of the perl startup here.	546	* emulate part of the perl startup here.
629	*/	547	*/
630	dSP;
631	Coro__State ctx = (Coro__State)arg;
632	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
633		548
634	coro_init_stacks (aTHX);	549	coro_init_stacks ();
		550
		551	{
		552	dSP;
		553	LOGOP myop;
		554
635	/*PL_curcop = 0;*/	555	/*PL_curcop = 0;*/
636	/*PL_in_eval = PL_in_eval;*/ /* inherit */	556	PL_in_eval = 0;
637	SvREFCNT_dec (GvAV (PL_defgv));	557	SvREFCNT_dec (GvAV (PL_defgv));
638	GvAV (PL_defgv) = ctx->args; ctx->args = 0;	558	GvAV (PL_defgv) = coro->args; coro->args = 0;
639		559
640	SPAGAIN;	560	SPAGAIN;
641		561
642	if (ctx->stack)
643	{
644	ctx->cursp = 0;
645
646	PUSHMARK(SP);
647	PUTBACK;
648	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
649
650	if (SvTRUE (ERRSV))
651	croak (NULL);
652	else
653	croak ("FATAL: CCTXT coroutine returned!");
654	}
655	else
656	{
657	UNOP myop;
658
659	PL_op = (OP *)&myop;
660
661	Zero(&myop, 1, UNOP);	562	Zero (&myop, 1, LOGOP);
662	myop.op_next = Nullop;	563	myop.op_next = Nullop;
663	myop.op_flags = OPf_WANT_VOID;	564	myop.op_flags = OPf_WANT_VOID;
664		565
		566	PL_op = (OP *)&myop;
		567
665	PUSHMARK(SP);	568	PUSHMARK (SP);
666	XPUSHs (sub_init);	569	PUSHMARK (SP);
667	/*	570	XPUSHs ((SV *)get_cv ("Coro::State::coro_init", FALSE));
668	* the next line is slightly wrong, as PL_op->op_next
669	* is actually being executed so we skip the first op.
670	* that doesn't matter, though, since it is only
671	* pp_nextstate and we never return...
672	* ah yes, and I don't care anyways ;)
673	*/
674	PUTBACK;	571	PUTBACK;
675	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	572	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
676	SPAGAIN;	573	SPAGAIN;
677		574
678	ENTER; /* necessary e.g. for dounwind */	575	ENTER; /* necessary e.g. for dounwind */
679	}	576	}
680	}	577	}
681		578
682	static void	579	static void
683	continue_coro (void *arg)	580	free_coro_mortal ()
684	{	581	{
685	/*
686	* this is a _very_ stripped down perl interpreter ;)
687	*/
688	Coro__State ctx = (Coro__State)arg;
689	JMPENV coro_start_env;
690
691	PL_top_env = &ctx->start_env;
692
693	ctx->cursp = 0;
694	PL_op = PL_op->op_next;
695	CALLRUNOPS(aTHX);
696
697	abort ();
698	}
699
700	STATIC void
701	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
702	{
703	dSTACKLEVEL;
704	static struct coro *xnext;
705
706	if (prev != next)
707	{
708	xnext = next;
709
710	if (next->mainstack)
711	{
712	SAVE (prev, flags);
713	LOAD (next);
714
715	/* mark this state as in-use */
716	next->mainstack = 0;
717	next->tmps_ix = -2;
718
719	/* stacklevel changed? if yes, grab the stack for us! */
720	if (flags & TRANSFER_SAVE_CCTXT)
721	{
722	if (!prev->stack)
723	allocate_stack (prev, 0);
724	else if (prev->cursp != stacklevel
725	&& prev->stack->usecnt > 1)
726	{
727	prev->gencnt = ++prev->stack->gencnt;
728	prev->stack->usecnt = 1;
729	}
730
731	/* has our stack been invalidated? */
732	if (next->stack && next->stack->gencnt != next->gencnt)
733	{
734	deallocate_stack (next);
735	allocate_stack (next, 1);
736	coro_create (&(next->stack->cctx),
737	continue_coro, (void *)next,
738	next->stack->sptr, labs (next->stack->ssize));
739	}
740
741	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
742	/* don't add any code here */
743	}
744
745	}
746	else if (next->tmps_ix == -2)
747	croak ("tried to transfer to running coroutine");
748	else
749	{
750	SAVE (prev, -1); /* first get rid of the old state */
751
752	if (flags & TRANSFER_SAVE_CCTXT)
753	{
754	if (!prev->stack)
755	allocate_stack (prev, 0);
756
757	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
758	{
759	PL_top_env = &next->start_env;
760
761	setup_coro (next);
762
763	prev->stack->refcnt++;
764	prev->stack->usecnt++;
765	next->stack = prev->stack;
766	next->gencnt = prev->gencnt;
767	}
768	else
769	{
770	assert (!next->stack);
771	allocate_stack (next, 1);
772	coro_create (&(next->stack->cctx),
773	setup_coro, (void *)next,
774	next->stack->sptr, labs (next->stack->ssize));
775	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
776	/* don't add any code here */
777	}
778	}
779	else
780	setup_coro (next);
781	}
782
783	/*
784	* xnext is now either prev or next, depending on wether
785	* we switched the c stack or not. that's why I use a global
786	* variable, that should become thread-specific at one point.
787	*/
788	xnext->cursp = stacklevel;
789	}
790
791	if (coro_mortal)	582	if (coro_mortal)
792	{	583	{
793	SvREFCNT_dec (coro_mortal);	584	SvREFCNT_dec (coro_mortal);
794	coro_mortal = 0;	585	coro_mortal = 0;
795	}	586	}
796	}	587	}
797		588
798	#define SV_CORO(sv,func) \	589	static void NOINLINE
799	do { \	590	prepare_cctx (coro_stack *cctx)
800	if (SvROK (sv)) \	591	{
801	sv = SvRV (sv); \	592	dSP;
802	\	593	LOGOP myop;
803	if (SvTYPE(sv) == SVt_PVHV) \
804	{ \
805	HE *he = hv_fetch_ent((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
806	\
807	if (!he) \
808	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
809	\
810	(sv) = SvRV (HeVAL(he)); \
811	} \
812	\
813	/* must also be changed inside Coro::Cont::yield */ \
814	if (!SvOBJECT(sv) || SvSTASH(sv) != coro_state_stash) \
815	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
816	\
817	} while(0)
818		594
819	#define SvSTATE(sv) (struct coro *)SvIV (sv)	595	Zero (&myop, 1, LOGOP);
		596	myop.op_next = PL_op;
		597	myop.op_flags = OPf_WANT_VOID;
820		598
		599	sv_setiv (get_sv ("Coro::State::cctx_stack", FALSE), PTR2IV (cctx));
		600
		601	PUSHMARK (SP);
		602	XPUSHs ((SV *)get_cv ("Coro::State::cctx_init", FALSE));
		603	PUTBACK;
		604	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
		605	SPAGAIN;
		606	}
		607
		608	static void
		609	coro_run (void *arg)
		610	{
		611	/* coro_run is the alternative epilogue of transfer() */
		612	UNLOCK;
		613
		614	/*
		615	* this is a _very_ stripped down perl interpreter ;)
		616	*/
		617	PL_top_env = &PL_start_env;
		618	/* inject call to cctx_init */
		619	prepare_cctx ((coro_stack *)arg);
		620
		621	/* somebody will hit me for both perl_run and PL_restartop */
		622	perl_run (PL_curinterp);
		623
		624	fputs ("FATAL: C coroutine fell over the edge of the world, aborting.\n", stderr);
		625	abort ();
		626	}
		627
		628	static coro_stack *
		629	stack_new ()
		630	{
		631	coro_stack *stack;
		632
		633	New (0, stack, 1, coro_stack);
		634
		635	#if HAVE_MMAP
		636
		637	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		638	/* mmap suppsedly does allocate-on-write for us */
		639	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		640
		641	if (stack->sptr == (void *)-1)
		642	{
		643	perror ("FATAL: unable to mmap stack for coroutine");
		644	_exit (EXIT_FAILURE);
		645	}
		646
		647	# if STACKGUARD
		648	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		649	# endif
		650
		651	#else
		652
		653	stack->ssize = STACKSIZE * (long)sizeof (long);
		654	New (0, stack->sptr, STACKSIZE, long);
		655
		656	if (!stack->sptr)
		657	{
		658	perror (stderr, "FATAL: unable to malloc stack for coroutine");
		659	_exit (EXIT_FAILURE);
		660	}
		661
		662	#endif
		663
		664	coro_create (&stack->cctx, coro_run, (void *)stack, stack->sptr, stack->ssize);
		665
		666	return stack;
		667	}
		668
		669	static void
		670	stack_free (coro_stack *stack)
		671	{
		672	if (!stack)
		673	return;
		674
		675	#if HAVE_MMAP
		676	munmap (stack->sptr, stack->ssize);
		677	#else
		678	Safefree (stack->sptr);
		679	#endif
		680
		681	Safefree (stack);
		682	}
		683
		684	static coro_stack *stack_first;
		685	static int cctx_count, cctx_idle;
		686
		687	static coro_stack *
		688	stack_get ()
		689	{
		690	coro_stack *stack;
		691
		692	if (stack_first)
		693	{
		694	--cctx_idle;
		695	stack = stack_first;
		696	stack_first = stack->next;
		697	}
		698	else
		699	{
		700	++cctx_count;
		701	stack = stack_new ();
		702	PL_op = PL_op->op_next;
		703	}
		704
		705	return stack;
		706	}
		707
		708	static void
		709	stack_put (coro_stack *stack)
		710	{
		711	++cctx_idle;
		712	stack->next = stack_first;
		713	stack_first = stack;
		714	}
		715
		716	/* never call directly, always through the coro_state_transfer global variable */
		717	static void NOINLINE
		718	transfer (struct coro *prev, struct coro *next, int flags)
		719	{
		720	dSTACKLEVEL;
		721
		722	/* sometimes transfer is only called to set idle_sp */
		723	if (flags == TRANSFER_SET_STACKLEVEL)
		724	((coro_stack *)prev)->idle_sp = STACKLEVEL;
		725	else if (prev != next)
		726	{
		727	coro_stack *prev__stack;
		728
		729	LOCK;
		730
		731	if (next->mainstack)
		732	{
		733	/* coroutine already started */
		734	SAVE (prev, flags);
		735	LOAD (next);
		736	}
		737	else
		738	{
		739	/* need to start coroutine */
		740	/* first get rid of the old state */
		741	SAVE (prev, -1);
		742	/* setup coroutine call */
		743	setup_coro (next);
		744	/* need a stack */
		745	next->stack = 0;
		746	}
		747
		748	if (!prev->stack)
		749	/* create a new empty context */
		750	Newz (0, prev->stack, 1, coro_stack);
		751
		752	prev__stack = prev->stack;
		753
		754	/* possibly "free" the stack */
		755	if (prev__stack->idle_sp == STACKLEVEL)
		756	{
		757	stack_put (prev__stack);
		758	prev->stack = 0;
		759	}
		760
		761	if (!next->stack)
		762	next->stack = stack_get ();
		763
		764	if (prev__stack != next->stack)
		765	{
		766	prev__stack->top_env = PL_top_env;
		767	PL_top_env = next->stack->top_env;
		768	coro_transfer (&prev__stack->cctx, &next->stack->cctx);
		769	}
		770
		771	free_coro_mortal ();
		772
		773	UNLOCK;
		774	}
		775	}
		776
		777	struct transfer_args
		778	{
		779	struct coro *prev, *next;
		780	int flags;
		781	};
		782
		783	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		784
		785	static void
		786	coro_state_destroy (struct coro *coro)
		787	{
		788	if (coro->refcnt--)
		789	return;
		790
		791	if (coro->mainstack && coro->mainstack != main_mainstack)
		792	{
		793	struct coro temp;
		794
		795	SAVE ((&temp), TRANSFER_SAVE_ALL);
		796	LOAD (coro);
		797
		798	coro_destroy_stacks ();
		799
		800	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		801
		802	coro->mainstack = 0;
		803	}
		804
		805	stack_free (coro->stack);
		806	SvREFCNT_dec (coro->args);
		807	Safefree (coro);
		808	}
		809
821	static void	810	static int
		811	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		812	{
		813	struct coro *coro = (struct coro *)mg->mg_ptr;
		814	mg->mg_ptr = 0;
		815
		816	coro_state_destroy (coro);
		817
		818	return 0;
		819	}
		820
		821	static int
		822	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		823	{
		824	struct coro *coro = (struct coro *)mg->mg_ptr;
		825
		826	++coro->refcnt;
		827
		828	return 0;
		829	}
		830
		831	static MGVTBL coro_state_vtbl = {
		832	0, 0, 0, 0,
		833	coro_state_clear,
		834	0,
		835	#ifdef MGf_DUP
		836	coro_state_dup,
		837	#else
		838	# define MGf_DUP 0
		839	#endif
		840	};
		841
		842	static struct coro *
		843	SvSTATE (SV *coro)
		844	{
		845	HV *stash;
		846	MAGIC *mg;
		847
		848	if (SvROK (coro))
		849	coro = SvRV (coro);
		850
		851	stash = SvSTASH (coro);
		852	if (stash != coro_stash && stash != coro_state_stash)
		853	{
		854	/* very slow, but rare, check */
		855	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		856	croak ("Coro::State object required");
		857	}
		858
		859	mg = SvMAGIC (coro);
		860	assert (mg->mg_type == PERL_MAGIC_ext);
		861	return (struct coro *)mg->mg_ptr;
		862	}
		863
		864	static void
		865	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		866	{
		867	ta->prev = SvSTATE (prev);
		868	ta->next = SvSTATE (next);
		869	ta->flags = flags;
		870	}
		871
		872	static void
822	api_transfer(pTHX_ SV *prev, SV *next, int flags)	873	api_transfer (SV *prev, SV *next, int flags)
823	{	874	{
824	SV_CORO (prev, "Coro::transfer");	875	dTHX;
825	SV_CORO (next, "Coro::transfer");	876	struct transfer_args ta;
826		877
827	transfer(aTHX_ SvSTATE(prev), SvSTATE(next), flags);	878	prepare_transfer (&ta, prev, next, flags);
		879	TRANSFER (ta);
828	}	880	}
829		881
830	/** Coro ********************************************************************/	882	/** Coro ********************************************************************/
831		883
832	#define PRIO_MAX 3	884	#define PRIO_MAX 3
…		…
836	#define PRIO_IDLE -3	888	#define PRIO_IDLE -3
837	#define PRIO_MIN -4	889	#define PRIO_MIN -4
838		890
839	/* for Coro.pm */	891	/* for Coro.pm */
840	static GV *coro_current, *coro_idle;	892	static GV *coro_current, *coro_idle;
841	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	893	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
842	static int coro_nready;	894	static int coro_nready;
843		895
844	static void	896	static void
845	coro_enq (SV *sv)	897	coro_enq (SV *sv)
846	{	898	{
		899	int prio;
		900
847	if (SvTYPE (sv) == SVt_PVHV)	901	if (SvTYPE (sv) != SVt_PVHV)
848	{
849	SV **xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
850	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
851
852	prio = prio > PRIO_MAX ? PRIO_MAX
853	: prio < PRIO_MIN ? PRIO_MIN
854	: prio;
855
856	av_push (coro_ready [prio - PRIO_MIN], sv);
857	coro_nready++;
858
859	return;
860	}
861
862	croak ("Coro::ready tried to enqueue something that is not a coroutine");	902	croak ("Coro::ready tried to enqueue something that is not a coroutine");
		903
		904	prio = SvSTATE (sv)->prio;
		905
		906	av_push (coro_ready [prio - PRIO_MIN], sv);
		907	coro_nready++;
863	}	908	}
864		909
865	static SV *	910	static SV *
866	coro_deq (int min_prio)	911	coro_deq (int min_prio)
867	{	912	{
…		…
870	min_prio -= PRIO_MIN;	915	min_prio -= PRIO_MIN;
871	if (min_prio < 0)	916	if (min_prio < 0)
872	min_prio = 0;	917	min_prio = 0;
873		918
874	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	919	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
875	if (av_len (coro_ready[prio]) >= 0)	920	if (AvFILLp (coro_ready [prio]) >= 0)
876	{	921	{
877	coro_nready--;	922	coro_nready--;
878	return av_shift (coro_ready[prio]);	923	return av_shift (coro_ready [prio]);
879	}	924	}
880		925
881	return 0;	926	return 0;
882	}	927	}
883		928
884	static void	929	static void
885	api_ready (SV *coro)	930	api_ready (SV *coro)
886	{	931	{
		932	dTHX;
		933
887	if (SvROK (coro))	934	if (SvROK (coro))
888	coro = SvRV (coro);	935	coro = SvRV (coro);
889		936
		937	LOCK;
890	coro_enq (SvREFCNT_inc (coro));	938	coro_enq (SvREFCNT_inc (coro));
		939	UNLOCK;
		940	}
		941
		942	static void
		943	prepare_schedule (struct transfer_args *ta)
		944	{
		945	SV *current, *prev, *next;
		946
		947	current = GvSV (coro_current);
		948
		949	for (;;)
		950	{
		951	LOCK;
		952	next = coro_deq (PRIO_MIN);
		953	UNLOCK;
		954
		955	if (next)
		956	break;
		957
		958	{
		959	dSP;
		960
		961	ENTER;
		962	SAVETMPS;
		963
		964	PUSHMARK (SP);
		965	PUTBACK;
		966	call_sv (GvSV (coro_idle), G_DISCARD);
		967
		968	FREETMPS;
		969	LEAVE;
		970	}
		971	}
		972
		973	prev = SvRV (current);
		974	SvRV (current) = next;
		975
		976	/* free this only after the transfer */
		977	LOCK;
		978	free_coro_mortal ();
		979	UNLOCK;
		980	coro_mortal = prev;
		981
		982	ta->prev = SvSTATE (prev);
		983	ta->next = SvSTATE (next);
		984	ta->flags = TRANSFER_SAVE_ALL;
		985	}
		986
		987	static void
		988	prepare_cede (struct transfer_args *ta)
		989	{
		990	LOCK;
		991	coro_enq (SvREFCNT_inc (SvRV (GvSV (coro_current))));
		992	UNLOCK;
		993
		994	prepare_schedule (ta);
891	}	995	}
892		996
893	static void	997	static void
894	api_schedule (void)	998	api_schedule (void)
895	{	999	{
896	SV *prev, *next;	1000	dTHX;
		1001	struct transfer_args ta;
897		1002
898	prev = SvRV (GvSV (coro_current));	1003	prepare_schedule (&ta);
899	next = coro_deq (PRIO_MIN);	1004	TRANSFER (ta);
900
901	if (!next)
902	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
903
904	/* free this only after the transfer */
905	coro_mortal = prev;
906	SV_CORO (prev, "Coro::schedule");
907
908	SvRV (GvSV (coro_current)) = next;
909
910	SV_CORO (next, "Coro::schedule");
911
912	transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
913	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
914	}	1005	}
915		1006
916	static void	1007	static void
917	api_cede (void)	1008	api_cede (void)
918	{	1009	{
919	coro_enq (SvREFCNT_inc (SvRV (GvSV (coro_current))));	1010	dTHX;
		1011	struct transfer_args ta;
920		1012
921	api_schedule ();	1013	prepare_cede (&ta);
		1014	TRANSFER (ta);
922	}	1015	}
923		1016
924	MODULE = Coro::State PACKAGE = Coro::State	1017	MODULE = Coro::State PACKAGE = Coro::State
925		1018
926	PROTOTYPES: ENABLE	1019	PROTOTYPES: DISABLE
927		1020
928	BOOT:	1021	BOOT:
929	{ /* {} necessary for stoopid perl-5.6.x */	1022	{
930	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1023	#ifdef USE_ITHREADS
931	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1024	MUTEX_INIT (&coro_mutex);
		1025	#endif
		1026	BOOT_PAGESIZE;
		1027
932	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1028	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
933		1029
934	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1030	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
935	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1031	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
936	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1032	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
937	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
938
939	if (!padlist_cache)
940	padlist_cache = newHV ();
941		1033
942	main_mainstack = PL_mainstack;	1034	main_mainstack = PL_mainstack;
943		1035
944	coroapi.ver = CORO_API_VERSION;	1036	coroapi.ver = CORO_API_VERSION;
945	coroapi.transfer = api_transfer;	1037	coroapi.transfer = api_transfer;
946	}
947		1038
948	Coro::State	1039	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
949	_newprocess(args)	1040	}
950	SV * args	1041
951	PROTOTYPE: $	1042	SV *
		1043	new (char *klass, ...)
952	CODE:	1044	CODE:
953	Coro__State coro;	1045	{
		1046	struct coro *coro;
		1047	HV *hv;
		1048	int i;
954		1049
955	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
956	croak ("Coro::State::_newprocess expects an arrayref");
957
958	Newz (0, coro, 1, struct coro);	1050	Newz (0, coro, 1, struct coro);
		1051	coro->args = newAV ();
959		1052
960	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1053	hv = newHV ();
		1054	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
		1055	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		1056
		1057	for (i = 1; i < items; i++)
		1058	av_push (coro->args, newSVsv (ST (i)));
		1059
961	coro->mainstack = 0; /* actual work is done inside transfer */	1060	/*coro->mainstack = 0; *//*actual work is done inside transfer */
962	coro->stack = 0;	1061	/*coro->stack = 0;*/
963		1062	}
964	/* same as JMPENV_BOOTSTRAP */
965	/* we might be able to recycle start_env, but safe is safe */
966	//Zero(&coro->start_env, 1, JMPENV);
967	coro->start_env.je_ret = -1;
968	coro->start_env.je_mustcatch = TRUE;
969
970	RETVAL = coro;
971	OUTPUT:	1063	OUTPUT:
972	RETVAL	1064	RETVAL
973		1065
974	void	1066	void
975	transfer(prev, next, flags)	1067	_set_stacklevel (...)
976	SV *prev	1068	ALIAS:
977	SV *next	1069	Coro::State::transfer = 1
978	int flags	1070	Coro::schedule = 2
979	PROTOTYPE: @	1071	Coro::cede = 3
		1072	Coro::Cont::yield = 4
980	CODE:	1073	CODE:
981	PUTBACK;	1074	{
982	SV_CORO (next, "Coro::transfer");	1075	struct transfer_args ta;
983	SV_CORO (prev, "Coro::transfer");	1076
984	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1077	switch (ix)
985	SPAGAIN;	1078	{
		1079	case 0:
		1080	ta.prev = (struct coro *)INT2PTR (coro_stack *, SvIV (ST (0)));
		1081	ta.next = 0;
		1082	ta.flags = TRANSFER_SET_STACKLEVEL;
		1083	break;
		1084
		1085	case 1:
		1086	if (items != 3)
		1087	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);
		1088
		1089	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1090	break;
		1091
		1092	case 2:
		1093	prepare_schedule (&ta);
		1094	break;
		1095
		1096	case 3:
		1097	prepare_cede (&ta);
		1098	break;
		1099
		1100	case 4:
		1101	{
		1102	SV *yieldstack;
		1103	SV *sv;
		1104	AV *defav = GvAV (PL_defgv);
		1105
		1106	yieldstack = *hv_fetch (
		1107	(HV *)SvRV (GvSV (coro_current)),
		1108	"yieldstack", sizeof ("yieldstack") - 1,
		1109	0
		1110	);
		1111
		1112	/* set up @_ -- ugly */
		1113	av_clear (defav);
		1114	av_fill (defav, items - 1);
		1115	while (items--)
		1116	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1117
		1118	sv = av_pop ((AV *)SvRV (yieldstack));
		1119	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1120	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1121	ta.flags = 0;
		1122	SvREFCNT_dec (sv);
		1123	}
		1124	break;
		1125
		1126	}
		1127
		1128	TRANSFER (ta);
		1129	}
986		1130
987	void	1131	void
988	DESTROY(coro)	1132	_clone_state_from (SV *dst, SV *src)
989	Coro::State coro	1133	CODE:
990	CODE:	1134	{
		1135	struct coro *coro_src = SvSTATE (src);
991		1136
992	if (coro->mainstack && coro->mainstack != main_mainstack)	1137	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
993	{
994	struct coro temp;
995		1138
996	PUTBACK;	1139	++coro_src->refcnt;
997	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1140	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
998	LOAD(aTHX_ coro);	1141	}
999	SPAGAIN;
1000
1001	destroy_stacks (aTHX);
1002
1003	LOAD((&temp)); /* this will get rid of defsv etc.. */
1004	SPAGAIN;
1005
1006	coro->mainstack = 0;
1007	}
1008
1009	deallocate_stack (coro);
1010	SvREFCNT_dec (coro->args);
1011	Safefree (coro);
1012		1142
1013	void	1143	void
1014	flush()
1015	CODE:
1016	#ifdef MAY_FLUSH
1017	flush_padlist_cache ();
1018	#endif
1019
1020	void
1021	_exit(code)	1144	_exit (code)
1022	int code	1145	int code
1023	PROTOTYPE: $	1146	PROTOTYPE: $
1024	CODE:	1147	CODE:
1025	#if defined(__GLIBC__) || _POSIX_C_SOURCE
1026	_exit (code);	1148	_exit (code);
1027	#else
1028	signal (SIGTERM, SIG_DFL);
1029	raise (SIGTERM);
1030	exit (code);
1031	#endif
1032
1033	MODULE = Coro::State PACKAGE = Coro::Cont
1034
1035	# this is slightly dirty (should expose a c-level api)
1036
1037	void
1038	yield(...)
1039	PROTOTYPE: @
1040	CODE:
1041	static SV *returnstk;
1042	SV *sv;
1043	AV *defav = GvAV (PL_defgv);
1044	struct coro *prev, *next;
1045
1046	if (!returnstk)
1047	returnstk = SvRV ((SV *)get_sv ("Coro::Cont::return", FALSE));
1048
1049	/* set up @_ -- ugly */
1050	av_clear (defav);
1051	av_fill (defav, items - 1);
1052	while (items--)
1053	av_store (defav, items, SvREFCNT_inc (ST(items)));
1054
1055	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
1056	sv = av_pop ((AV *)SvRV (returnstk));
1057	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
1058	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
1059	SvREFCNT_dec (sv);
1060
1061	transfer(aTHX_ prev, next, 0);
1062		1149
1063	MODULE = Coro::State PACKAGE = Coro	1150	MODULE = Coro::State PACKAGE = Coro
1064		1151
1065	# this is slightly dirty (should expose a c-level api)
1066
1067	BOOT:	1152	BOOT:
1068	{	1153	{
1069	int i;	1154	int i;
		1155
1070	HV *stash = gv_stashpv ("Coro", TRUE);	1156	coro_stash = gv_stashpv ("Coro", TRUE);
1071		1157
1072	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1158	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1073	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1159	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1074	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1160	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1075	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1161	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1076	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1162	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1077	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1163	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1078		1164
1079	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1165	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1080	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1166	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1081		1167
1082	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1168	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
…		…
1090	coroapi.ready = api_ready;	1176	coroapi.ready = api_ready;
1091	coroapi.nready = &coro_nready;	1177	coroapi.nready = &coro_nready;
1092	coroapi.current = coro_current;	1178	coroapi.current = coro_current;
1093		1179
1094	GCoroAPI = &coroapi;	1180	GCoroAPI = &coroapi;
1095	sv_setiv(sv, (IV)&coroapi);	1181	sv_setiv (sv, (IV)&coroapi);
1096	SvREADONLY_on(sv);	1182	SvREADONLY_on (sv);
1097	}	1183	}
1098	}	1184	}
1099		1185
		1186	int
		1187	prio (Coro::State coro, int newprio = 0)
		1188	ALIAS:
		1189	nice = 1
		1190	CODE:
		1191	{
		1192	RETVAL = coro->prio;
		1193
		1194	if (items > 1)
		1195	{
		1196	if (ix)
		1197	newprio += coro->prio;
		1198
		1199	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1200	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1201
		1202	coro->prio = newprio;
		1203	}
		1204	}
		1205
1100	void	1206	void
1101	ready(self)	1207	ready (SV *self)
1102	SV * self
1103	PROTOTYPE: $	1208	PROTOTYPE: $
1104	CODE:	1209	CODE:
1105	api_ready (self);	1210	api_ready (self);
1106		1211
1107	int	1212	int
1108	nready(...)	1213	nready (...)
1109	PROTOTYPE:	1214	PROTOTYPE:
1110	CODE:	1215	CODE:
1111	RETVAL = coro_nready;	1216	RETVAL = coro_nready;
1112	OUTPUT:	1217	OUTPUT:
1113	RETVAL	1218	RETVAL
1114		1219
		1220	MODULE = Coro::State PACKAGE = Coro::AIO
		1221
		1222	SV *
		1223	_get_state ()
		1224	CODE:
		1225	{
		1226	struct {
		1227	int errorno;
		1228	int laststype;
		1229	int laststatval;
		1230	Stat_t statcache;
		1231	} data;
		1232
		1233	data.errorno = errno;
		1234	data.laststype = PL_laststype;
		1235	data.laststatval = PL_laststatval;
		1236	data.statcache = PL_statcache;
		1237
		1238	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1239	}
		1240	OUTPUT:
		1241	RETVAL
		1242
1115	void	1243	void
1116	schedule(...)	1244	_set_state (char *data_)
1117	PROTOTYPE:	1245	PROTOTYPE: $
1118	CODE:	1246	CODE:
1119	api_schedule ();	1247	{
		1248	struct {
		1249	int errorno;
		1250	int laststype;
		1251	int laststatval;
		1252	Stat_t statcache;
		1253	} *data = (void *)data_;
1120		1254
1121	void	1255	errno = data->errorno;
1122	cede(...)	1256	PL_laststype = data->laststype;
1123	PROTOTYPE:	1257	PL_laststatval = data->laststatval;
1124	CODE:	1258	PL_statcache = data->statcache;
1125	api_cede ();	1259	}
1126

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