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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.84 by root, Fri Nov 24 00:31:21 2006 UTC vs.
Revision 1.125 by root, Mon Dec 11 20:54:45 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	#define UCORO_STATE "_coro_state"
64		82
65	/* 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
66	* 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
67	* and should be unique. */	85	* and should be unique. */
		86	#define dSTACKLEVEL int stacklevel
68	#define dSTACKLEVEL void *stacklevel = &stacklevel	87	#define STACKLEVEL ((void *)&stacklevel)
69		88
70	#define IN_DESTRUCT (PL_main_cv == Nullcv)	89	#define IN_DESTRUCT (PL_main_cv == Nullcv)
71		90
72	#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))
73		98
74	#include "CoroAPI.h"	99	#include "CoroAPI.h"
75		100
76	#ifdef USE_ITHREADS	101	#ifdef USE_ITHREADS
77	static perl_mutex coro_mutex;	102	static perl_mutex coro_mutex;
…		…
80	#else	105	#else
81	# define LOCK (void)0	106	# define LOCK (void)0
82	# define UNLOCK (void)0	107	# define UNLOCK (void)0
83	#endif	108	#endif
84		109
		110	struct io_state
		111	{
		112	int errorno;
		113	I32 laststype;
		114	int laststatval;
		115	Stat_t statcache;
		116	};
		117
85	static struct CoroAPI coroapi;	118	static struct CoroAPI coroapi;
86	static AV *main_mainstack; /* used to differentiate between $main and others */	119	static AV *main_mainstack; /* used to differentiate between $main and others */
87	static HV *coro_state_stash;	120	static HV *coro_state_stash, *coro_stash;
88	static SV *ucoro_state_sv;
89	static U32 ucoro_state_hash;
90	static SV *coro_mortal; /* will be freed after next transfer */	121	static SV *coro_mortal; /* will be freed after next transfer */
91		122
92	/* this is actually not only 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 */
93	typedef struct {	127	typedef struct coro_cctx {
94	int refcnt; /* pointer reference counter */	128	struct coro_cctx *next;
95	int usecnt; /* shared by how many coroutines */
96	int gencnt; /* generation counter */
97		129
98	coro_context cctx;	130	/* the stack */
99
100	void *sptr;	131	void *sptr;
101	long ssize; /* positive == mmap, otherwise malloc */	132	long ssize; /* positive == mmap, otherwise malloc */
102	} coro_stack;
103		133
		134	/* cpu state */
		135	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		136	JMPENV *top_env;
		137	coro_context cctx;
		138
		139	int inuse;
		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 */
104	struct coro {	153	struct coro {
105	/* the optional C context */	154	/* the c coroutine allocated to this perl coroutine, if any */
106	coro_stack *stack;	155	coro_cctx *cctx;
107	void *cursp;
108	int gencnt;
109
110	/* optionally saved, might be zero */
111	AV *defav;
112	SV *defsv;
113	SV *errsv;
114
115	/* saved global state not related to stacks */
116	U8 dowarn;
117	I32 in_eval;
118
119	/* the stacks and related info (callchain etc..) */
120	PERL_SI *curstackinfo;
121	AV *curstack;
122	AV *mainstack;
123	SV **stack_sp;
124	OP *op;
125	SV **curpad;
126	AV *comppad;
127	CV *compcv;
128	SV **stack_base;
129	SV **stack_max;
130	SV **tmps_stack;
131	I32 tmps_floor;
132	I32 tmps_ix;
133	I32 tmps_max;
134	I32 *markstack;
135	I32 *markstack_ptr;
136	I32 *markstack_max;
137	I32 *scopestack;
138	I32 scopestack_ix;
139	I32 scopestack_max;
140	ANY *savestack;
141	I32 savestack_ix;
142	I32 savestack_max;
143	OP **retstack;
144	I32 retstack_ix;
145	I32 retstack_max;
146	PMOP *curpm;
147	COP *curcop;
148	JMPENV *top_env;
149		156
150	/* data associated with this coroutine (initial args) */	157	/* data associated with this coroutine (initial args) */
151	AV *args;	158	AV *args;
		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;
152	};	176	};
153		177
154	typedef struct coro *Coro__State;	178	typedef struct coro *Coro__State;
155	typedef struct coro *Coro__State_or_hashref;	179	typedef struct coro *Coro__State_or_hashref;
156		180
157	static AV *	181	static AV *
158	coro_clone_padlist (pTHX_ CV *cv)	182	coro_clone_padlist (CV *cv)
159	{	183	{
160	AV *padlist = CvPADLIST (cv);	184	AV *padlist = CvPADLIST (cv);
161	AV *newpadlist, *newpad;	185	AV *newpadlist, *newpad;
162		186
163	newpadlist = newAV ();	187	newpadlist = newAV ();
164	AvREAL_off (newpadlist);	188	AvREAL_off (newpadlist);
165	#if PERL_VERSION < 9	189	#if PERL_VERSION_ATLEAST (5,9,0)
		190	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		191	#else
166	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);	192	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
167	#else
168	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
169	#endif	193	#endif
170	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];	194	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
171	--AvFILLp (padlist);	195	--AvFILLp (padlist);
172		196
173	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));	197	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
…		…
175		199
176	return newpadlist;	200	return newpadlist;
177	}	201	}
178		202
179	static void	203	static void
180	free_padlist (pTHX_ AV *padlist)	204	free_padlist (AV *padlist)
181	{	205	{
182	/* may be during global destruction */	206	/* may be during global destruction */
183	if (SvREFCNT (padlist))	207	if (SvREFCNT (padlist))
184	{	208	{
185	I32 i = AvFILLp (padlist);	209	I32 i = AvFILLp (padlist);
…		…
206	AV *padlist;	230	AV *padlist;
207	AV *av = (AV *)mg->mg_obj;	231	AV *av = (AV *)mg->mg_obj;
208		232
209	/* casting is fun. */	233	/* casting is fun. */
210	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	234	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
211	free_padlist (aTHX_ padlist);	235	free_padlist (padlist);
212		236
213	SvREFCNT_dec (av);	237	SvREFCNT_dec (av);
214		238
215	return 0;	239	return 0;
216	}	240	}
217		241
218	#define PERL_MAGIC_coro PERL_MAGIC_ext	242	#define PERL_MAGIC_coro PERL_MAGIC_ext
219		243
220	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	244	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
221		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
222	/* the next two functions merely cache the padlists */	253	/* the next two functions merely cache the padlists */
223	static void	254	static void
224	get_padlist (pTHX_ CV *cv)	255	get_padlist (CV *cv)
225	{	256	{
226	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	257	MAGIC *mg = CORO_MAGIC (cv);
		258	AV *av;
227		259
228	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	260	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
229	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	261	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
230	else	262	else
231	{	263	{
232	#if 0	264	#if 0
233	/* this should work - but it doesn't :( */	265	/* this is probably cleaner, but also slower? */
234	CV *cp = Perl_cv_clone (aTHX_ cv);	266	CV *cp = Perl_cv_clone (cv);
235	CvPADLIST (cv) = CvPADLIST (cp);	267	CvPADLIST (cv) = CvPADLIST (cp);
236	CvPADLIST (cp) = 0;	268	CvPADLIST (cp) = 0;
237	SvREFCNT_dec (cp);	269	SvREFCNT_dec (cp);
238	#else	270	#else
239	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);	271	CvPADLIST (cv) = coro_clone_padlist (cv);
240	#endif	272	#endif
241	}	273	}
242	}	274	}
243		275
244	static void	276	static void
245	put_padlist (pTHX_ CV *cv)	277	put_padlist (CV *cv)
246	{	278	{
247	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	279	MAGIC *mg = CORO_MAGIC (cv);
		280	AV *av;
248		281
249	if (!mg)	282	if (!mg)
250	{	283	{
251	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	284	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
252	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	285	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
253	mg->mg_virtual = &vtbl_coro;	286	mg->mg_virtual = &vtbl_coro;
254	mg->mg_obj = (SV *)newAV ();	287	mg->mg_obj = (SV *)newAV ();
255	}	288	}
256		289
257	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);
258	}	296	}
259		297
260	#define SB do {	298	#define SB do {
261	#define SE } while (0)	299	#define SE } while (0)
262		300
263	#define LOAD(state) load_state(aTHX_ (state));
264	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
265
266	#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
267		302
268	static void	303	static void
269	load_state(pTHX_ Coro__State c)	304	load_perl (Coro__State c)
270	{	305	{
271	PL_dowarn = c->dowarn;	306	#define VAR(name,type) PL_ ## name = c->name;
272	PL_in_eval = c->in_eval;	307	# include "state.h"
273		308	#undef VAR
274	PL_curstackinfo = c->curstackinfo;
275	PL_curstack = c->curstack;
276	PL_mainstack = c->mainstack;
277	PL_stack_sp = c->stack_sp;
278	PL_op = c->op;
279	PL_curpad = c->curpad;
280	PL_comppad = c->comppad;
281	PL_compcv = c->compcv;
282	PL_stack_base = c->stack_base;
283	PL_stack_max = c->stack_max;
284	PL_tmps_stack = c->tmps_stack;
285	PL_tmps_floor = c->tmps_floor;
286	PL_tmps_ix = c->tmps_ix;
287	PL_tmps_max = c->tmps_max;
288	PL_markstack = c->markstack;
289	PL_markstack_ptr = c->markstack_ptr;
290	PL_markstack_max = c->markstack_max;
291	PL_scopestack = c->scopestack;
292	PL_scopestack_ix = c->scopestack_ix;
293	PL_scopestack_max = c->scopestack_max;
294	PL_savestack = c->savestack;
295	PL_savestack_ix = c->savestack_ix;
296	PL_savestack_max = c->savestack_max;
297	#if PERL_VERSION < 9
298	PL_retstack = c->retstack;
299	PL_retstack_ix = c->retstack_ix;
300	PL_retstack_max = c->retstack_max;
301	#endif
302	PL_curpm = c->curpm;
303	PL_curcop = c->curcop;
304	PL_top_env = c->top_env;
305		309
306	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	310	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
307	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	311	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
308	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	}
309		324
310	{	325	{
311	dSP;	326	dSP;
312	CV *cv;	327	CV *cv;
313		328
314	/* now do the ugly restore mess */	329	/* now do the ugly restore mess */
315	while ((cv = (CV *)POPs))	330	while ((cv = (CV *)POPs))
316	{	331	{
317	AV *padlist = (AV *)POPs;
318
319	if (padlist)
320	{
321	put_padlist (aTHX_ cv); /* mark this padlist as available */	332	put_padlist (cv); /* mark this padlist as available */
322	CvPADLIST(cv) = padlist;	333	CvDEPTH (cv) = PTR2IV (POPs);
323	}	334	CvPADLIST (cv) = (AV *)POPs;
324
325	++CvDEPTH(cv);
326	}	335	}
327		336
328	PUTBACK;	337	PUTBACK;
329	}	338	}
330	}	339	}
331		340
332	static void	341	static void
333	save_state(pTHX_ Coro__State c, int flags)	342	save_perl (Coro__State c)
334	{	343	{
335	{	344	{
336	dSP;	345	dSP;
337	I32 cxix = cxstack_ix;	346	I32 cxix = cxstack_ix;
338	PERL_CONTEXT *ccstk = cxstack;	347	PERL_CONTEXT *ccstk = cxstack;
…		…
349	{	358	{
350	while (cxix >= 0)	359	while (cxix >= 0)
351	{	360	{
352	PERL_CONTEXT *cx = &ccstk[cxix--];	361	PERL_CONTEXT *cx = &ccstk[cxix--];
353		362
354	if (CxTYPE(cx) == CXt_SUB)	363	if (CxTYPE (cx) == CXt_SUB)
355	{	364	{
356	CV *cv = cx->blk_sub.cv;	365	CV *cv = cx->blk_sub.cv;
		366
357	if (CvDEPTH(cv))	367	if (CvDEPTH (cv))
358	{	368	{
359	EXTEND (SP, CvDEPTH(cv)*2);	369	EXTEND (SP, 3);
360		370
361	while (--CvDEPTH(cv))
362	{
363	/* this tells the restore code to increment CvDEPTH */
364	PUSHs (Nullsv);
365	PUSHs ((SV *)cv);
366	}
367
368	PUSHs ((SV *)CvPADLIST(cv));	371	PUSHs ((SV *)CvPADLIST (cv));
		372	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
369	PUSHs ((SV *)cv);	373	PUSHs ((SV *)cv);
370		374
		375	CvDEPTH (cv) = 0;
371	get_padlist (aTHX_ cv);	376	get_padlist (cv);
372	}	377	}
373	}	378	}
374	#ifdef CXt_FORMAT	379	#ifdef CXt_FORMAT
375	else if (CxTYPE(cx) == CXt_FORMAT)	380	else if (CxTYPE (cx) == CXt_FORMAT)
376	{	381	{
377	/* I never used formats, so how should I know how these are implemented? */	382	/* I never used formats, so how should I know how these are implemented? */
378	/* my bold guess is as a simple, plain sub... */	383	/* my bold guess is as a simple, plain sub... */
379	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	384	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
380	}	385	}
…		…
390	}	395	}
391		396
392	PUTBACK;	397	PUTBACK;
393	}	398	}
394		399
395	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	400	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
396	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	401	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
397	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	402	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		403	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
398		404
399	c->dowarn = PL_dowarn;	405	#define VAR(name,type)c->name = PL_ ## name;
400	c->in_eval = PL_in_eval;	406	# include "state.h"
401		407	#undef VAR
402	c->curstackinfo = PL_curstackinfo;
403	c->curstack = PL_curstack;
404	c->mainstack = PL_mainstack;
405	c->stack_sp = PL_stack_sp;
406	c->op = PL_op;
407	c->curpad = PL_curpad;
408	c->comppad = PL_comppad;
409	c->compcv = PL_compcv;
410	c->stack_base = PL_stack_base;
411	c->stack_max = PL_stack_max;
412	c->tmps_stack = PL_tmps_stack;
413	c->tmps_floor = PL_tmps_floor;
414	c->tmps_ix = PL_tmps_ix;
415	c->tmps_max = PL_tmps_max;
416	c->markstack = PL_markstack;
417	c->markstack_ptr = PL_markstack_ptr;
418	c->markstack_max = PL_markstack_max;
419	c->scopestack = PL_scopestack;
420	c->scopestack_ix = PL_scopestack_ix;
421	c->scopestack_max = PL_scopestack_max;
422	c->savestack = PL_savestack;
423	c->savestack_ix = PL_savestack_ix;
424	c->savestack_max = PL_savestack_max;
425	#if PERL_VERSION < 9
426	c->retstack = PL_retstack;
427	c->retstack_ix = PL_retstack_ix;
428	c->retstack_max = PL_retstack_max;
429	#endif
430	c->curpm = PL_curpm;
431	c->curcop = PL_curcop;
432	c->top_env = PL_top_env;
433	}	408	}
434		409
435	/*	410	/*
436	* allocate various perl stacks. This is an exact copy	411	* allocate various perl stacks. This is an exact copy
437	* of perl.c:init_stacks, except that it uses less memory	412	* of perl.c:init_stacks, except that it uses less memory
438	* on the (sometimes correct) assumption that coroutines do	413	* on the (sometimes correct) assumption that coroutines do
439	* not usually need a lot of stackspace.	414	* not usually need a lot of stackspace.
440	*/	415	*/
441	static void	416	static void
442	coro_init_stacks (pTHX)	417	coro_init_stacks ()
443	{	418	{
444	LOCK;
445
446	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	419	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
447	PL_curstackinfo->si_type = PERLSI_MAIN;	420	PL_curstackinfo->si_type = PERLSI_MAIN;
448	PL_curstack = PL_curstackinfo->si_stack;	421	PL_curstack = PL_curstackinfo->si_stack;
449	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	422	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
450		423
451	PL_stack_base = AvARRAY(PL_curstack);	424	PL_stack_base = AvARRAY(PL_curstack);
452	PL_stack_sp = PL_stack_base;	425	PL_stack_sp = PL_stack_base;
453	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	426	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
454		427
455	New(50,PL_tmps_stack,96,SV*);	428	New(50,PL_tmps_stack,128,SV*);
456	PL_tmps_floor = -1;	429	PL_tmps_floor = -1;
457	PL_tmps_ix = -1;	430	PL_tmps_ix = -1;
458	PL_tmps_max = 96;	431	PL_tmps_max = 128;
459		432
460	New(54,PL_markstack,16,I32);	433	New(54,PL_markstack,32,I32);
461	PL_markstack_ptr = PL_markstack;	434	PL_markstack_ptr = PL_markstack;
462	PL_markstack_max = PL_markstack + 16;	435	PL_markstack_max = PL_markstack + 32;
463		436
464	#ifdef SET_MARK_OFFSET	437	#ifdef SET_MARK_OFFSET
465	SET_MARK_OFFSET;	438	SET_MARK_OFFSET;
466	#endif	439	#endif
467		440
468	New(54,PL_scopestack,16,I32);	441	New(54,PL_scopestack,32,I32);
469	PL_scopestack_ix = 0;	442	PL_scopestack_ix = 0;
470	PL_scopestack_max = 16;	443	PL_scopestack_max = 32;
471		444
472	New(54,PL_savestack,96,ANY);	445	New(54,PL_savestack,64,ANY);
473	PL_savestack_ix = 0;	446	PL_savestack_ix = 0;
474	PL_savestack_max = 96;	447	PL_savestack_max = 64;
475		448
476	#if PERL_VERSION < 9	449	#if !PERL_VERSION_ATLEAST (5,9,0)
477	New(54,PL_retstack,8,OP*);	450	New(54,PL_retstack,16,OP*);
478	PL_retstack_ix = 0;	451	PL_retstack_ix = 0;
479	PL_retstack_max = 8;	452	PL_retstack_max = 16;
480	#endif	453	#endif
481
482	UNLOCK;
483	}	454	}
484		455
485	/*	456	/*
486	* destroy the stacks, the callchain etc...	457	* destroy the stacks, the callchain etc...
487	*/	458	*/
488	static void	459	static void
489	destroy_stacks(pTHX)	460	coro_destroy_stacks ()
490	{	461	{
491	if (!IN_DESTRUCT)	462	if (!IN_DESTRUCT)
492	{	463	{
493	/* is this ugly, I ask? */	464	/* is this ugly, I ask? */
494	LEAVE_SCOPE (0);	465	LEAVE_SCOPE (0);
…		…
525		496
526	Safefree (PL_tmps_stack);	497	Safefree (PL_tmps_stack);
527	Safefree (PL_markstack);	498	Safefree (PL_markstack);
528	Safefree (PL_scopestack);	499	Safefree (PL_scopestack);
529	Safefree (PL_savestack);	500	Safefree (PL_savestack);
530	#if PERL_VERSION < 9	501	#if !PERL_VERSION_ATLEAST (5,9,0)
531	Safefree (PL_retstack);	502	Safefree (PL_retstack);
532	#endif	503	#endif
533	}	504	}
534		505
535	static void	506	static void
536	allocate_stack (Coro__State ctx, int alloc)	507	setup_coro (struct coro *coro)
537	{
538	coro_stack *stack;
539
540	New (0, stack, 1, coro_stack);
541
542	stack->refcnt = 1;
543	stack->usecnt = 1;
544	stack->gencnt = ctx->gencnt = 0;
545
546	if (alloc)
547	{
548	#if HAVE_MMAP
549	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE; /* mmap should do allocate-on-write for us */
550	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
551	if (stack->sptr != (void *)-1)
552	{
553	# if STACKGUARD
554	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
555	# endif
556	}
557	else
558	#endif
559	{
560	stack->ssize = - (STACKSIZE * (long)sizeof (long));
561	New (0, stack->sptr, STACKSIZE, long);
562	}
563	}
564	else
565	stack->sptr = 0;
566
567	ctx->stack = stack;
568	}
569
570	static void
571	deallocate_stack (Coro__State ctx)
572	{
573	coro_stack *stack = ctx->stack;
574
575	ctx->stack = 0;
576
577	if (stack)
578	{
579	if (!--stack->refcnt)
580	{
581	#ifdef HAVE_MMAP
582	if (stack->ssize > 0 && stack->sptr)
583	munmap (stack->sptr, stack->ssize);
584	else
585	#endif
586	Safefree (stack->sptr);
587
588	Safefree (stack);
589	}
590	else if (ctx->gencnt == stack->gencnt)
591	--stack->usecnt;
592	}
593	}
594
595	static void
596	setup_coro (void *arg)
597	{	508	{
598	/*	509	/*
599	* emulate part of the perl startup here.	510	* emulate part of the perl startup here.
600	*/	511	*/
601	dTHX;	512
		513	coro_init_stacks ();
		514
		515	PL_curcop = &PL_compiling;
		516	PL_in_eval = EVAL_NULL;
		517	PL_curpm = 0;
		518	PL_localizing = 0;
		519	PL_dirty = 0;
		520	PL_restartop = 0;
		521
		522	{
		523	dSP;
		524	LOGOP myop;
		525
		526	SvREFCNT_dec (GvAV (PL_defgv));
		527	GvAV (PL_defgv) = coro->args; coro->args = 0;
		528
		529	Zero (&myop, 1, LOGOP);
		530	myop.op_next = Nullop;
		531	myop.op_flags = OPf_WANT_VOID;
		532
		533	PUSHMARK (SP);
		534	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		535	PUTBACK;
		536	PL_op = (OP *)&myop;
		537	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		538	SPAGAIN;
		539	}
		540
		541	ENTER; /* necessary e.g. for dounwind */
		542	}
		543
		544	static void
		545	free_coro_mortal ()
		546	{
		547	if (coro_mortal)
		548	{
		549	SvREFCNT_dec (coro_mortal);
		550	coro_mortal = 0;
		551	}
		552	}
		553
		554	/* inject a fake call to Coro::State::_cctx_init into the execution */
		555	static void NOINLINE
		556	prepare_cctx (coro_cctx *cctx)
		557	{
602	dSP;	558	dSP;
603	Coro__State ctx = (Coro__State)arg;	559	LOGOP myop;
604	SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
605		560
606	coro_init_stacks (aTHX);	561	Zero (&myop, 1, LOGOP);
607	/*PL_curcop = 0;*/	562	myop.op_next = PL_op;
608	/*PL_in_eval = PL_in_eval;*/ /* inherit */	563	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
609	SvREFCNT_dec (GvAV (PL_defgv));
610	GvAV (PL_defgv) = ctx->args; ctx->args = 0;
611		564
		565	PUSHMARK (SP);
		566	EXTEND (SP, 2);
		567	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		568	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		569	PUTBACK;
		570	PL_op = (OP *)&myop;
		571	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
612	SPAGAIN;	572	SPAGAIN;
613
614	if (ctx->stack)
615	{
616	ctx->cursp = 0;
617
618	PUSHMARK(SP);
619	PUTBACK;
620	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
621
622	if (SvTRUE (ERRSV))
623	croak (NULL);
624	else
625	croak ("FATAL: CCTXT coroutine returned!");
626	}
627	else
628	{
629	UNOP myop;
630
631	Zero(&myop, 1, UNOP);
632	myop.op_next = Nullop;
633	myop.op_flags = OPf_WANT_VOID;
634
635	PL_op = (OP *)&myop;
636
637	PUSHMARK(SP);
638	XPUSHs (sub_init);
639	/*
640	* the next line is slightly wrong, as PL_op->op_next
641	* is actually being executed so we skip the first op.
642	* that doesn't matter, though, since it is only
643	* pp_nextstate and we never return...
644	* ah yes, and I don't care anyways ;)
645	*/
646	PUTBACK;
647	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
648	SPAGAIN;
649
650	ENTER; /* necessary e.g. for dounwind */
651	}
652	}	573	}
653		574
654	static void	575	static void
655	continue_coro (void *arg)	576	coro_run (void *arg)
656	{	577	{
		578	/* coro_run is the alternative tail of transfer(), so unlock here. */
		579	UNLOCK;
		580
657	/*	581	/*
658	* this is a _very_ stripped down perl interpreter ;)	582	* this is a _very_ stripped down perl interpreter ;)
659	*/	583	*/
660	dTHX;
661	Coro__State ctx = (Coro__State)arg;
662
663	PL_top_env = &PL_start_env;	584	PL_top_env = &PL_start_env;
664		585
665	ctx->cursp = 0;	586	/* inject call to cctx_init */
666	PL_op = PL_op->op_next;	587	prepare_cctx ((coro_cctx *)arg);
667	CALLRUNOPS(aTHX);
668		588
		589	/* somebody will hit me for both perl_run and PL_restartop */
		590	PL_restartop = PL_op;
		591	perl_run (PL_curinterp);
		592
		593	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
669	abort ();	594	abort ();
670	}	595	}
671		596
		597	static coro_cctx *
		598	cctx_new ()
		599	{
		600	coro_cctx *cctx;
		601
		602	++cctx_count;
		603
		604	Newz (0, cctx, 1, coro_cctx);
		605
		606	#if HAVE_MMAP
		607
		608	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		609	/* mmap supposedly does allocate-on-write for us */
		610	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		611
		612	if (cctx->sptr == (void *)-1)
		613	{
		614	perror ("FATAL: unable to mmap stack for coroutine");
		615	_exit (EXIT_FAILURE);
		616	}
		617
		618	# if STACKGUARD
		619	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		620	# endif
		621
		622	#else
		623
		624	cctx->ssize = STACKSIZE * (long)sizeof (long);
		625	New (0, cctx->sptr, STACKSIZE, long);
		626
		627	if (!cctx->sptr)
		628	{
		629	perror ("FATAL: unable to malloc stack for coroutine");
		630	_exit (EXIT_FAILURE);
		631	}
		632
		633	#endif
		634
		635	#if USE_VALGRIND
		636	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		637	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		638	cctx->ssize + (char *)cctx->sptr
		639	);
		640	#endif
		641
		642	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		643
		644	return cctx;
		645	}
		646
		647	static void
		648	cctx_destroy (coro_cctx *cctx)
		649	{
		650	if (!cctx)
		651	return;
		652
		653	--cctx_count;
		654
		655	#if USE_VALGRIND
		656	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		657	#endif
		658
		659	#if HAVE_MMAP
		660	munmap (cctx->sptr, cctx->ssize);
		661	#else
		662	Safefree (cctx->sptr);
		663	#endif
		664
		665	Safefree (cctx);
		666	}
		667
		668	static coro_cctx *
		669	cctx_get ()
		670	{
		671	coro_cctx *cctx;
		672
		673	if (cctx_first)
		674	{
		675	cctx = cctx_first;
		676	cctx_first = cctx->next;
		677	--cctx_idle;
		678	}
		679	else
		680	{
		681	cctx = cctx_new ();
		682	PL_op = PL_op->op_next;
		683	}
		684
		685	return cctx;
		686	}
		687
		688	static void
		689	cctx_put (coro_cctx *cctx)
		690	{
		691	/* free another cctx if overlimit */
		692	if (cctx_idle >= MAX_IDLE_CCTX)
		693	{
		694	coro_cctx *first = cctx_first;
		695	cctx_first = first->next;
		696	--cctx_idle;
		697
		698	assert (!first->inuse);
		699	cctx_destroy (first);
		700	}
		701
		702	++cctx_idle;
		703	cctx->next = cctx_first;
		704	cctx_first = cctx;
		705	}
		706
672	/* never call directly, always through the coro_state_transfer global variable */	707	/* never call directly, always through the coro_state_transfer global variable */
673	static void	708	static void NOINLINE
674	transfer_impl (pTHX_ struct coro *prev, struct coro *next, int flags)	709	transfer (struct coro *prev, struct coro *next)
675	{	710	{
676	dSTACKLEVEL;	711	dSTACKLEVEL;
677		712
		713	/* sometimes transfer is only called to set idle_sp */
		714	if (!next)
		715	{
		716	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		717	assert (((coro_cctx *)prev)->top_env = PL_top_env); /* just for the side effetc when assert is enabled */
		718	}
678	if (prev != next)	719	else if (prev != next)
679	{	720	{
680	/* has this coro been created yet? */	721	coro_cctx *prev__cctx;
681	if (next->mainstack)	722
		723	if (prev->flags & CF_NEW)
682	{	724	{
683	LOCK;	725	/* create a new empty context */
684	SAVE (prev, flags);	726	Newz (0, prev->cctx, 1, coro_cctx);
685	LOAD (next);	727	prev->cctx->inuse = 1;
686	UNLOCK;	728	prev->flags &= ~CF_NEW;
687		729	prev->flags |= CF_RUNNING;
688	/* mark this state as in-use */
689	next->mainstack = 0;
690	next->tmps_ix = -2;
691
692	/* stacklevel changed? if yes, grab the stack for us! */
693	if (flags & TRANSFER_SAVE_CCTXT)
694	{
695	if (!prev->stack)
696	allocate_stack (prev, 0);
697	else if (prev->cursp != stacklevel
698	&& prev->stack->usecnt > 1)
699	{
700	prev->gencnt = ++prev->stack->gencnt;
701	prev->stack->usecnt = 1;
702	}
703
704	/* has our stack been invalidated? */
705	if (next->stack && next->stack->gencnt != next->gencnt)
706	{
707	deallocate_stack (next);
708	allocate_stack (next, 1);
709	coro_create (&(next->stack->cctx),
710	continue_coro, (void *)next,
711	next->stack->sptr, labs (next->stack->ssize));
712	}
713
714	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
715	prev->cursp = stacklevel;
716	/* don't add any code here */
717	}
718	else
719	next->cursp = stacklevel;
720	}	730	}
721	else if (next->tmps_ix == -2)	731
722	croak ("tried to transfer to running coroutine");	732	/*TODO: must not croak here */
		733	if (!prev->flags & CF_RUNNING)
		734	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		735
		736	if (next->flags & CF_RUNNING)
		737	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		738
		739	prev->flags &= ~CF_RUNNING;
		740	next->flags |= CF_RUNNING;
		741
		742	LOCK;
		743
		744	if (next->flags & CF_NEW)
		745	{
		746	/* need to start coroutine */
		747	next->flags &= ~CF_NEW;
		748	/* first get rid of the old state */
		749	save_perl (prev);
		750	/* setup coroutine call */
		751	setup_coro (next);
		752	/* need a new stack */
		753	assert (!next->cctx);
		754	}
723	else	755	else
724	{	756	{
725	LOCK;	757	/* coroutine already started */
726	SAVE (prev, -1); /* first get rid of the old state */	758	save_perl (prev);
727	UNLOCK;	759	load_perl (next);
728
729	/* create the coroutine for the first time */
730	if (flags & TRANSFER_SAVE_CCTXT)
731	{
732	if (!prev->stack)
733	allocate_stack (prev, 0);
734
735	/* the new coroutine starts with start_env again */
736	PL_top_env = &PL_start_env;
737
738	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
739	{
740	setup_coro (next);
741	next->cursp = stacklevel;
742
743	prev->stack->refcnt++;
744	prev->stack->usecnt++;
745	next->stack = prev->stack;
746	next->gencnt = prev->gencnt;
747	}
748	else
749	{
750	assert (!next->stack);
751	allocate_stack (next, 1);
752	coro_create (&(next->stack->cctx),
753	setup_coro, (void *)next,
754	next->stack->sptr, labs (next->stack->ssize));
755	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
756	prev->cursp = stacklevel;
757	/* don't add any code here */
758	}
759	}
760	else
761	{
762	setup_coro (next);
763	next->cursp = stacklevel;
764	}
765	}	760	}
		761
		762	prev__cctx = prev->cctx;
		763
		764	/* possibly "free" the cctx */
		765	if (prev__cctx->idle_sp == STACKLEVEL)
		766	{
		767	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		768	assert (PL_top_env == prev__cctx->top_env);
		769
		770	prev->cctx = 0;
		771
		772	cctx_put (prev__cctx);
		773	prev__cctx->inuse = 0;
		774	}
		775
		776	if (!next->cctx)
		777	{
		778	next->cctx = cctx_get ();
		779	assert (!next->cctx->inuse);
		780	next->cctx->inuse = 1;
		781	}
		782
		783	if (prev__cctx != next->cctx)
		784	{
		785	prev__cctx->top_env = PL_top_env;
		786	PL_top_env = next->cctx->top_env;
		787	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		788	}
		789
		790	free_coro_mortal ();
		791
		792	UNLOCK;
766	}	793	}
		794	}
767		795
768	LOCK;	796	struct transfer_args
769	if (coro_mortal)	797	{
		798	struct coro *prev, *next;
		799	};
		800
		801	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		802
		803	static void
		804	coro_state_destroy (struct coro *coro)
		805	{
		806	if (coro->refcnt--)
		807	return;
		808
		809	if (coro->mainstack && coro->mainstack != main_mainstack)
770	{	810	{
771	SvREFCNT_dec (coro_mortal);	811	struct coro temp;
		812	Zero (&temp, 1, struct coro);
		813	temp.save = CORO_SAVE_ALL;
		814
		815	if (coro->flags & CF_RUNNING)
		816	croak ("FATAL: tried to destroy currently running coroutine");
		817
		818	save_perl (&temp);
		819	load_perl (coro);
		820
		821	coro_destroy_stacks ();
		822
		823	load_perl (&temp); /* this will get rid of defsv etc.. */
		824
772	coro_mortal = 0;	825	coro->mainstack = 0;
773	}	826	}
774	UNLOCK;
775	}
776		827
777	void (*coro_state_transfer)(pTHX_ struct coro *prev, struct coro *next, int flags) = transfer_impl;	828	cctx_destroy (coro->cctx);
		829	SvREFCNT_dec (coro->args);
		830	Safefree (coro);
		831	}
778		832
779	#define SV_CORO(sv,func) \
780	do { \
781	if (SvROK (sv)) \
782	sv = SvRV (sv); \
783	\
784	if (SvTYPE (sv) == SVt_PVHV) \
785	{ \
786	HE *he = hv_fetch_ent ((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
787	\
788	if (!he) \
789	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
790	\
791	(sv) = SvRV (HeVAL(he)); \
792	} \
793	\
794	/* must also be changed inside Coro::Cont::yield */ \
795	if (!SvOBJECT (sv) || SvSTASH (sv) != coro_state_stash) \
796	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
797	\
798	} while(0)
799
800	#define SvSTATE(sv) INT2PTR (struct coro *, SvIVX (sv))
801
802	static void	833	static int
		834	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		835	{
		836	struct coro *coro = (struct coro *)mg->mg_ptr;
		837	mg->mg_ptr = 0;
		838
		839	coro_state_destroy (coro);
		840
		841	return 0;
		842	}
		843
		844	static int
		845	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		846	{
		847	struct coro *coro = (struct coro *)mg->mg_ptr;
		848
		849	++coro->refcnt;
		850
		851	return 0;
		852	}
		853
		854	static MGVTBL coro_state_vtbl = {
		855	0, 0, 0, 0,
		856	coro_state_clear,
		857	0,
		858	#ifdef MGf_DUP
		859	coro_state_dup,
		860	#else
		861	# define MGf_DUP 0
		862	#endif
		863	};
		864
		865	static struct coro *
		866	SvSTATE (SV *coro)
		867	{
		868	HV *stash;
		869	MAGIC *mg;
		870
		871	if (SvROK (coro))
		872	coro = SvRV (coro);
		873
		874	stash = SvSTASH (coro);
		875	if (stash != coro_stash && stash != coro_state_stash)
		876	{
		877	/* very slow, but rare, check */
		878	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		879	croak ("Coro::State object required");
		880	}
		881
		882	mg = SvMAGIC (coro);
		883	assert (mg->mg_type == PERL_MAGIC_ext);
		884	return (struct coro *)mg->mg_ptr;
		885	}
		886
		887	static void
		888	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		889	{
		890	ta->prev = SvSTATE (prev_sv);
		891	ta->next = SvSTATE (next_sv);
		892	}
		893
		894	static void
803	api_transfer (pTHX_ SV *prev, SV *next, int flags)	895	api_transfer (SV *prev_sv, SV *next_sv)
804	{	896	{
805	SV_CORO (prev, "Coro::transfer");	897	struct transfer_args ta;
806	SV_CORO (next, "Coro::transfer");
807		898
808	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	899	prepare_transfer (&ta, prev_sv, next_sv);
		900	TRANSFER (ta);
		901	}
		902
		903	static int
		904	api_save (SV *coro_sv, int new_save)
		905	{
		906	struct coro *coro = SvSTATE (coro_sv);
		907	int old_save = coro->save;
		908
		909	if (new_save >= 0)
		910	coro->save = new_save;
		911
		912	return old_save;
809	}	913	}
810		914
811	/** Coro ********************************************************************/	915	/** Coro ********************************************************************/
812		916
813	#define PRIO_MAX 3	917	#define PRIO_MAX 3
…		…
816	#define PRIO_LOW -1	920	#define PRIO_LOW -1
817	#define PRIO_IDLE -3	921	#define PRIO_IDLE -3
818	#define PRIO_MIN -4	922	#define PRIO_MIN -4
819		923
820	/* for Coro.pm */	924	/* for Coro.pm */
821	static GV *coro_current, *coro_idle;	925	static SV *coro_current;
822	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];	926	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
823	static int coro_nready;	927	static int coro_nready;
824		928
825	static void	929	static void
826	coro_enq (pTHX_ SV *sv)	930	coro_enq (SV *coro_sv)
827	{	931	{
828	SV **xprio;
829	int prio;
830
831	if (SvTYPE (sv) != SVt_PVHV)
832	croak ("Coro::ready tried to enqueue something that is not a coroutine");
833
834	xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
835	prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
836
837	prio = prio > PRIO_MAX ? PRIO_MAX
838	: prio < PRIO_MIN ? PRIO_MIN
839	: prio;
840
841	av_push (coro_ready [prio - PRIO_MIN], sv);	932	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
842	coro_nready++;	933	coro_nready++;
843	}	934	}
844		935
845	static SV *	936	static SV *
846	coro_deq (pTHX_ int min_prio)	937	coro_deq (int min_prio)
847	{	938	{
848	int prio = PRIO_MAX - PRIO_MIN;	939	int prio = PRIO_MAX - PRIO_MIN;
849		940
850	min_prio -= PRIO_MIN;	941	min_prio -= PRIO_MIN;
851	if (min_prio < 0)	942	if (min_prio < 0)
…		…
859	}	950	}
860		951
861	return 0;	952	return 0;
862	}	953	}
863		954
864	static void	955	static int
865	api_ready (SV *coro)	956	api_ready (SV *coro_sv)
866	{	957	{
867	dTHX;	958	struct coro *coro;
868		959
869	if (SvROK (coro))	960	if (SvROK (coro_sv))
870	coro = SvRV (coro);	961	coro_sv = SvRV (coro_sv);
		962
		963	coro = SvSTATE (coro_sv);
		964
		965	if (coro->flags & CF_READY)
		966	return 0;
		967
		968	#if 0 /* this is actually harmless */
		969	if (coro->flags & CF_RUNNING)
		970	croak ("Coro::ready called on currently running coroutine");
		971	#endif
		972
		973	coro->flags |= CF_READY;
871		974
872	LOCK;	975	LOCK;
873	coro_enq (aTHX_ SvREFCNT_inc (coro));	976	coro_enq (SvREFCNT_inc (coro_sv));
874	UNLOCK;	977	UNLOCK;
		978
		979	return 1;
		980	}
		981
		982	static int
		983	api_is_ready (SV *coro_sv)
		984	{
		985	return !!SvSTATE (coro_sv)->flags & CF_READY;
		986	}
		987
		988	static void
		989	prepare_schedule (struct transfer_args *ta)
		990	{
		991	SV *prev, *next;
		992
		993	for (;;)
		994	{
		995	LOCK;
		996	next = coro_deq (PRIO_MIN);
		997	UNLOCK;
		998
		999	if (next)
		1000	break;
		1001
		1002	{
		1003	dSP;
		1004
		1005	ENTER;
		1006	SAVETMPS;
		1007
		1008	PUSHMARK (SP);
		1009	PUTBACK;
		1010	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1011
		1012	FREETMPS;
		1013	LEAVE;
		1014	}
		1015	}
		1016
		1017	prev = SvRV (coro_current);
		1018	SvRV_set (coro_current, next);
		1019
		1020	/* free this only after the transfer */
		1021	LOCK;
		1022	free_coro_mortal ();
		1023	UNLOCK;
		1024	coro_mortal = prev;
		1025
		1026	assert (!SvROK(prev));//D
		1027	assert (!SvROK(next));//D
		1028
		1029	ta->prev = SvSTATE (prev);
		1030	ta->next = SvSTATE (next);
		1031
		1032	assert (ta->next->flags & CF_READY);
		1033	ta->next->flags &= ~CF_READY;
		1034	}
		1035
		1036	static void
		1037	prepare_cede (struct transfer_args *ta)
		1038	{
		1039	api_ready (coro_current);
		1040
		1041	prepare_schedule (ta);
875	}	1042	}
876		1043
877	static void	1044	static void
878	api_schedule (void)	1045	api_schedule (void)
879	{	1046	{
880	dTHX;	1047	struct transfer_args ta;
881		1048
882	SV *prev, *next;	1049	prepare_schedule (&ta);
883		1050	TRANSFER (ta);
884	LOCK;
885
886	prev = SvRV (GvSV (coro_current));
887	next = coro_deq (aTHX_ PRIO_MIN);
888
889	if (!next)
890	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
891
892	/* free this only after the transfer */
893	coro_mortal = prev;
894	SV_CORO (prev, "Coro::schedule");
895
896	SvRV (GvSV (coro_current)) = next;
897
898	SV_CORO (next, "Coro::schedule");
899
900	UNLOCK;
901
902	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
903	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
904	}	1051	}
905		1052
906	static void	1053	static void
907	api_cede (void)	1054	api_cede (void)
908	{	1055	{
909	dTHX;	1056	struct transfer_args ta;
910		1057
911	LOCK;	1058	prepare_cede (&ta);
912	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));	1059	TRANSFER (ta);
913	UNLOCK;
914
915	api_schedule ();
916	}	1060	}
917		1061
918	MODULE = Coro::State PACKAGE = Coro::State	1062	MODULE = Coro::State PACKAGE = Coro::State
919		1063
920	PROTOTYPES: ENABLE	1064	PROTOTYPES: DISABLE
921		1065
922	BOOT:	1066	BOOT:
923	{ /* {} necessary for stoopid perl-5.6.x */	1067	{
924	#ifdef USE_ITHREADS	1068	#ifdef USE_ITHREADS
925	MUTEX_INIT (&coro_mutex);	1069	MUTEX_INIT (&coro_mutex);
926	#endif	1070	#endif
927	BOOT_PAGESIZE;	1071	BOOT_PAGESIZE;
928		1072
929	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);
930	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);
931	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1073	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
932		1074
933	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1075	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
934	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1076	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
935	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1077	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1078	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
936	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1079	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
937		1080
938	main_mainstack = PL_mainstack;	1081	main_mainstack = PL_mainstack;
939		1082
940	coroapi.ver = CORO_API_VERSION;	1083	coroapi.ver = CORO_API_VERSION;
941	coroapi.transfer = api_transfer;	1084	coroapi.transfer = api_transfer;
942	}
943		1085
944	Coro::State	1086	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
945	_newprocess(args)	1087	}
946	SV * args	1088
947	PROTOTYPE: $	1089	SV *
		1090	new (char *klass, ...)
948	CODE:	1091	CODE:
949	Coro__State coro;	1092	{
		1093	struct coro *coro;
		1094	HV *hv;
		1095	int i;
950		1096
951	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
952	croak ("Coro::State::_newprocess expects an arrayref");
953
954	Newz (0, coro, 1, struct coro);	1097	Newz (0, coro, 1, struct coro);
		1098	coro->args = newAV ();
		1099	coro->save = CORO_SAVE_ALL;
		1100	coro->flags = CF_NEW;
955		1101
956	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1102	hv = newHV ();
957	/*coro->mainstack = 0; *//*actual work is done inside transfer */	1103	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
958	/*coro->stack = 0;*/	1104	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
959		1105
960	RETVAL = coro;	1106	for (i = 1; i < items; i++)
		1107	av_push (coro->args, newSVsv (ST (i)));
		1108	}
961	OUTPUT:	1109	OUTPUT:
962	RETVAL	1110	RETVAL
963		1111
		1112	int
		1113	save (SV *coro, int new_save = -1)
		1114	CODE:
		1115	RETVAL = api_save (coro, new_save);
		1116	OUTPUT:
		1117	RETVAL
		1118
964	void	1119	void
965	transfer(prev, next, flags)	1120	_set_stacklevel (...)
966	SV *prev	1121	ALIAS:
967	SV *next	1122	Coro::State::transfer = 1
968	int flags	1123	Coro::schedule = 2
969	PROTOTYPE: @	1124	Coro::cede = 3
970	CODE:	1125	CODE:
971	PUTBACK;	1126	{
972	SV_CORO (next, "Coro::transfer");	1127	struct transfer_args ta;
973	SV_CORO (prev, "Coro::transfer");	1128
974	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1129	switch (ix)
975	SPAGAIN;	1130	{
		1131	case 0:
		1132	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1133	ta.next = 0;
		1134	break;
		1135
		1136	case 1:
		1137	if (items != 2)
		1138	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1139
		1140	prepare_transfer (&ta, ST (0), ST (1));
		1141	break;
		1142
		1143	case 2:
		1144	prepare_schedule (&ta);
		1145	break;
		1146
		1147	case 3:
		1148	prepare_cede (&ta);
		1149	break;
		1150	}
		1151
		1152	TRANSFER (ta);
		1153	}
976		1154
977	void	1155	void
978	DESTROY(coro)	1156	_clone_state_from (SV *dst, SV *src)
979	Coro::State coro	1157	CODE:
980	CODE:	1158	{
		1159	struct coro *coro_src = SvSTATE (src);
981		1160
982	if (coro->mainstack && coro->mainstack != main_mainstack)	1161	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
983	{
984	struct coro temp;
985		1162
986	PUTBACK;	1163	++coro_src->refcnt;
987	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);	1164	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
988	LOAD (aTHX_ coro);	1165	}
989	SPAGAIN;
990
991	destroy_stacks (aTHX);
992
993	LOAD ((&temp)); /* this will get rid of defsv etc.. */
994	SPAGAIN;
995
996	coro->mainstack = 0;
997	}
998
999	deallocate_stack (coro);
1000	SvREFCNT_dec (coro->args);
1001	Safefree (coro);
1002		1166
1003	void	1167	void
1004	_exit(code)	1168	_exit (code)
1005	int code	1169	int code
1006	PROTOTYPE: $	1170	PROTOTYPE: $
1007	CODE:	1171	CODE:
1008	_exit (code);	1172	_exit (code);
1009		1173
1010	MODULE = Coro::State PACKAGE = Coro::Cont	1174	int
		1175	cctx_count ()
		1176	CODE:
		1177	RETVAL = cctx_count;
		1178	OUTPUT:
		1179	RETVAL
1011		1180
1012	void	1181	int
1013	yield(...)	1182	cctx_idle ()
1014	PROTOTYPE: @	1183	CODE:
1015	CODE:	1184	RETVAL = cctx_idle;
1016	SV *yieldstack;	1185	OUTPUT:
1017	SV *sv;	1186	RETVAL
1018	AV *defav = GvAV (PL_defgv);
1019	struct coro *prev, *next;
1020
1021	yieldstack = *hv_fetch (
1022	(HV *)SvRV (GvSV (coro_current)),
1023	"yieldstack", sizeof ("yieldstack") - 1,
1024	0
1025	);
1026
1027	/* set up @_ -- ugly */
1028	av_clear (defav);
1029	av_fill (defav, items - 1);
1030	while (items--)
1031	av_store (defav, items, SvREFCNT_inc (ST(items)));
1032
1033	sv = av_pop ((AV *)SvRV (yieldstack));
1034	prev = SvSTATE ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
1035	next = SvSTATE ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
1036	SvREFCNT_dec (sv);
1037
1038	coro_state_transfer (aTHX_ prev, next, 0);
1039		1187
1040	MODULE = Coro::State PACKAGE = Coro	1188	MODULE = Coro::State PACKAGE = Coro
1041		1189
1042	BOOT:	1190	BOOT:
1043	{	1191	{
1044	int i;	1192	int i;
		1193
1045	HV *stash = gv_stashpv ("Coro", TRUE);	1194	coro_stash = gv_stashpv ("Coro", TRUE);
1046		1195
1047	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1196	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1048	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1197	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1049	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1198	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1050	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1199	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1051	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1200	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1052	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1201	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1053		1202
1054	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1203	coro_current = get_sv ("Coro::current", FALSE);
1055	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1204	SvREADONLY_on (coro_current);
1056		1205
1057	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1206	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1058	coro_ready[i] = newAV ();	1207	coro_ready[i] = newAV ();
1059		1208
1060	{	1209	{
1061	SV *sv = perl_get_sv("Coro::API", 1);	1210	SV *sv = perl_get_sv("Coro::API", 1);
1062		1211
1063	coroapi.schedule = api_schedule;	1212	coroapi.schedule = api_schedule;
		1213	coroapi.save = api_save;
1064	coroapi.cede = api_cede;	1214	coroapi.cede = api_cede;
1065	coroapi.ready = api_ready;	1215	coroapi.ready = api_ready;
		1216	coroapi.is_ready = api_is_ready;
1066	coroapi.nready = &coro_nready;	1217	coroapi.nready = &coro_nready;
1067	coroapi.current = coro_current;	1218	coroapi.current = coro_current;
1068		1219
1069	GCoroAPI = &coroapi;	1220	GCoroAPI = &coroapi;
1070	sv_setiv (sv, (IV)&coroapi);	1221	sv_setiv (sv, (IV)&coroapi);
1071	SvREADONLY_on (sv);	1222	SvREADONLY_on (sv);
1072	}	1223	}
1073	}	1224	}
1074		1225
1075	#if !PERL_MICRO
1076
1077	void	1226	void
1078	ready(self)	1227	_set_current (SV *current)
1079	SV * self
1080	PROTOTYPE: $	1228	PROTOTYPE: $
1081	CODE:	1229	CODE:
1082	api_ready (self);	1230	SvREFCNT_dec (SvRV (coro_current));
1083		1231	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1084	#endif
1085		1232
1086	int	1233	int
		1234	prio (Coro::State coro, int newprio = 0)
		1235	ALIAS:
		1236	nice = 1
		1237	CODE:
		1238	{
		1239	RETVAL = coro->prio;
		1240
		1241	if (items > 1)
		1242	{
		1243	if (ix)
		1244	newprio += coro->prio;
		1245
		1246	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1247	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1248
		1249	coro->prio = newprio;
		1250	}
		1251	}
		1252
		1253	SV *
		1254	ready (SV *self)
		1255	PROTOTYPE: $
		1256	CODE:
		1257	RETVAL = boolSV (api_ready (self));
		1258	OUTPUT:
		1259	RETVAL
		1260
		1261	SV *
		1262	is_ready (SV *self)
		1263	PROTOTYPE: $
		1264	CODE:
		1265	RETVAL = boolSV (api_is_ready (self));
		1266	OUTPUT:
		1267	RETVAL
		1268
		1269	int
1087	nready(...)	1270	nready (...)
1088	PROTOTYPE:	1271	PROTOTYPE:
1089	CODE:	1272	CODE:
1090	RETVAL = coro_nready;	1273	RETVAL = coro_nready;
1091	OUTPUT:	1274	OUTPUT:
1092	RETVAL	1275	RETVAL
1093		1276
1094	void	1277	MODULE = Coro::State PACKAGE = Coro::AIO
1095	schedule(...)	1278
1096	PROTOTYPE:	1279	SV *
		1280	_get_state ()
1097	CODE:	1281	CODE:
1098	api_schedule ();
1099
1100	void
1101	cede(...)
1102	PROTOTYPE:
1103	CODE:
1104	api_cede ();
1105
1106	# and these are hacks
1107	SV *
1108	_aio_get_state ()
1109	CODE:
1110	{	1282	{
1111	struct {	1283	struct io_state *data;
1112	int errorno;
1113	int laststype;
1114	int laststatval;
1115	Stat_t statcache;
1116	} data;
1117		1284
		1285	RETVAL = newSV (sizeof (struct io_state));
		1286	data = (struct io_state *)SvPVX (RETVAL);
		1287	SvCUR_set (RETVAL, sizeof (struct io_state));
		1288	SvPOK_only (RETVAL);
		1289
1118	data.errorno = errno;	1290	data->errorno = errno;
1119	data.laststype = PL_laststype;	1291	data->laststype = PL_laststype;
1120	data.laststatval = PL_laststatval;	1292	data->laststatval = PL_laststatval;
1121	data.statcache = PL_statcache;	1293	data->statcache = PL_statcache;
1122
1123	RETVAL = newSVpvn ((char *)&data, sizeof data);
1124	}	1294	}
1125	OUTPUT:	1295	OUTPUT:
1126	RETVAL	1296	RETVAL
1127		1297
1128	void	1298	void
1129	_aio_set_state (char *data_)	1299	_set_state (char *data_)
1130	PROTOTYPE: $	1300	PROTOTYPE: $
1131	CODE:	1301	CODE:
1132	{	1302	{
1133	struct {	1303	struct io_state *data = (void *)data_;
1134	int errorno;
1135	int laststype;
1136	int laststatval;
1137	Stat_t statcache;
1138	} *data = (void *)data_;
1139		1304
1140	errno = data->errorno;	1305	errno = data->errorno;
1141	PL_laststype = data->laststype;	1306	PL_laststype = data->laststype;
1142	PL_laststatval = data->laststatval;	1307	PL_laststatval = data->laststatval;
1143	PL_statcache = data->statcache;	1308	PL_statcache = data->statcache;
1144	}	1309	}
		1310

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