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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.89 by root, Sat Nov 25 00:40:26 2006 UTC vs.
Revision 1.126 by root, Tue Dec 12 04:19:56 2006 UTC

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

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