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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.93 by root, Sun Nov 26 03:22:50 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
32	#include <stdio.h>	48	#include <stdio.h>
33	#include <errno.h>	49	#include <errno.h>
		50	#include <assert.h>
34		51
35	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64	52	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
36	# undef STACKGUARD	53	# undef STACKGUARD
37	#endif	54	#endif
38		55
…		…
54	# ifndef PAGESIZE	71	# ifndef PAGESIZE
55	# define PAGESIZE pagesize	72	# define PAGESIZE pagesize
56	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)	73	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
57	static long pagesize;	74	static long pagesize;
58	# else	75	# else
59	# define BOOT_PAGESIZE	76	# define BOOT_PAGESIZE (void)0
60	# endif	77	# endif
		78	#else
		79	# define PAGESIZE 0
		80	# define BOOT_PAGESIZE (void)0
61	#endif	81	#endif
62		82
63	/* 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
64	* 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
65	* and should be unique. */	85	* and should be unique. */
66	#define dSTACKLEVEL int stacklevel	86	#define dSTACKLEVEL int stacklevel
67	#define STACKLEVEL ((void *)&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
75	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
76		100
77	#ifdef USE_ITHREADS	101	#ifdef USE_ITHREADS
78	static perl_mutex coro_mutex;	102	static perl_mutex coro_mutex;
79	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)	103	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
80	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)	104	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
81	#else	105	#else
82	# define LOCK (void)0	106	# define LOCK (void)0
83	# define UNLOCK (void)0	107	# define UNLOCK (void)0
84	#endif	108	#endif
85		109
		110	struct io_state
		111	{
		112	int errorno;
		113	I32 laststype;
		114	int laststatval;
		115	Stat_t statcache;
		116	};
		117
86	static struct CoroAPI coroapi;	118	static struct CoroAPI coroapi;
87	static AV *main_mainstack; /* used to differentiate between $main and others */	119	static AV *main_mainstack; /* used to differentiate between $main and others */
88	static HV *coro_state_stash, *coro_stash;	120	static HV *coro_state_stash, *coro_stash;
89	static SV *coro_mortal; /* will be freed after next transfer */	121	static SV *coro_mortal; /* will be freed after next transfer */
90		122
		123	static struct coro_cctx *cctx_first;
		124	static int cctx_count, cctx_idle;
		125
91	/* this is a structure representing a c-level coroutine */	126	/* this is a structure representing a c-level coroutine */
92	typedef struct coro_stack {	127	typedef struct coro_cctx {
93	struct coro_stack *next;	128	struct coro_cctx *next;
94		129
95	/* the stack */	130	/* the stack */
96	void *sptr;	131	void *sptr;
97	long ssize; /* positive == mmap, otherwise malloc */	132	long ssize; /* positive == mmap, otherwise malloc */
98		133
99	/* cpu state */	134	/* cpu state */
100	void *idle_sp; /* original stacklevel when coroutine was created */	135	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
101	JMPENV *top_env;	136	JMPENV *top_env;
102	coro_context cctx;	137	coro_context cctx;
103	} coro_stack;
104		138
105	/* the (fake) coro_stack representing the main program */	139	int inuse;
106	static coro_stack *main_stack;	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	};
107		151
108	/* this is a structure representing a perl-level coroutine */	152	/* this is a structure representing a perl-level coroutine */
109	struct coro {	153	struct coro {
110	/* the c coroutine allocated to this perl coroutine, if any */	154	/* the c coroutine allocated to this perl coroutine, if any */
111	coro_stack *stack;	155	coro_cctx *cctx;
112		156
113	/* data associated with this coroutine (initial args) */	157	/* data associated with this coroutine (initial args) */
114	AV *args;	158	AV *args;
115	int refcnt;	159	int refcnt;
		160	int save; /* CORO_SAVE flags */
		161	int flags; /* CF_ flags */
116		162
117	/* optionally saved, might be zero */	163	/* optionally saved, might be zero */
118	AV *defav;	164	AV *defav; /* @_ */
119	SV *defsv;	165	SV *defsv; /* $_ */
120	SV *errsv;	166	SV *errsv; /* $@ */
		167	SV *irssv; /* $/ */
		168	SV *irssv_sv; /* real $/ cache */
121		169
122	/* saved global state not related to stacks */	170	#define VAR(name,type) type name;
123	U8 dowarn;	171	# include "state.h"
124	I32 in_eval;	172	#undef VAR
125
126	/* the stacks and related info (callchain etc..) */
127	PERL_SI *curstackinfo;
128	AV *curstack;
129	AV *mainstack;
130	SV **stack_sp;
131	OP *op;
132	SV **curpad;
133	AV *comppad;
134	CV *compcv;
135	SV **stack_base;
136	SV **stack_max;
137	SV **tmps_stack;
138	I32 tmps_floor;
139	I32 tmps_ix;
140	I32 tmps_max;
141	I32 *markstack;
142	I32 *markstack_ptr;
143	I32 *markstack_max;
144	I32 *scopestack;
145	I32 scopestack_ix;
146	I32 scopestack_max;
147	ANY *savestack;
148	I32 savestack_ix;
149	I32 savestack_max;
150	OP **retstack;
151	I32 retstack_ix;
152	I32 retstack_max;
153	PMOP *curpm;
154	COP *curcop;
155		173
156	/* coro process data */	174	/* coro process data */
157	int prio;	175	int prio;
158	};	176	};
159		177
160	typedef struct coro *Coro__State;	178	typedef struct coro *Coro__State;
161	typedef struct coro *Coro__State_or_hashref;	179	typedef struct coro *Coro__State_or_hashref;
162		180
163	static AV *	181	static AV *
164	coro_clone_padlist (pTHX_ CV *cv)	182	coro_clone_padlist (CV *cv)
165	{	183	{
166	AV *padlist = CvPADLIST (cv);	184	AV *padlist = CvPADLIST (cv);
167	AV *newpadlist, *newpad;	185	AV *newpadlist, *newpad;
168		186
169	newpadlist = newAV ();	187	newpadlist = newAV ();
170	AvREAL_off (newpadlist);	188	AvREAL_off (newpadlist);
171	#if PERL_VERSION < 9	189	#if PERL_VERSION_ATLEAST (5,9,0)
		190	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		191	#else
172	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);	192	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
173	#else
174	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
175	#endif	193	#endif
176	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];	194	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
177	--AvFILLp (padlist);	195	--AvFILLp (padlist);
178		196
179	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));	197	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
…		…
181		199
182	return newpadlist;	200	return newpadlist;
183	}	201	}
184		202
185	static void	203	static void
186	free_padlist (pTHX_ AV *padlist)	204	free_padlist (AV *padlist)
187	{	205	{
188	/* may be during global destruction */	206	/* may be during global destruction */
189	if (SvREFCNT (padlist))	207	if (SvREFCNT (padlist))
190	{	208	{
191	I32 i = AvFILLp (padlist);	209	I32 i = AvFILLp (padlist);
…		…
212	AV *padlist;	230	AV *padlist;
213	AV *av = (AV *)mg->mg_obj;	231	AV *av = (AV *)mg->mg_obj;
214		232
215	/* casting is fun. */	233	/* casting is fun. */
216	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	234	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
217	free_padlist (aTHX_ padlist);	235	free_padlist (padlist);
218		236
219	SvREFCNT_dec (av);	237	SvREFCNT_dec (av);
220		238
221	return 0;	239	return 0;
222	}	240	}
223		241
224	#define PERL_MAGIC_coro PERL_MAGIC_ext	242	#define PERL_MAGIC_coro PERL_MAGIC_ext
225		243
226	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	244	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
227		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
228	/* the next two functions merely cache the padlists */	253	/* the next two functions merely cache the padlists */
229	static void	254	static void
230	get_padlist (pTHX_ CV *cv)	255	get_padlist (CV *cv)
231	{	256	{
232	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	257	MAGIC *mg = CORO_MAGIC (cv);
		258	AV *av;
233		259
234	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	260	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
235	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	261	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
236	else	262	else
237	{	263	{
238	#if 0	264	#if 0
239	/* this should work - but it doesn't :( */	265	/* this is probably cleaner, but also slower? */
240	CV *cp = Perl_cv_clone (aTHX_ cv);	266	CV *cp = Perl_cv_clone (cv);
241	CvPADLIST (cv) = CvPADLIST (cp);	267	CvPADLIST (cv) = CvPADLIST (cp);
242	CvPADLIST (cp) = 0;	268	CvPADLIST (cp) = 0;
243	SvREFCNT_dec (cp);	269	SvREFCNT_dec (cp);
244	#else	270	#else
245	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);	271	CvPADLIST (cv) = coro_clone_padlist (cv);
246	#endif	272	#endif
247	}	273	}
248	}	274	}
249		275
250	static void	276	static void
251	put_padlist (pTHX_ CV *cv)	277	put_padlist (CV *cv)
252	{	278	{
253	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	279	MAGIC *mg = CORO_MAGIC (cv);
		280	AV *av;
254		281
255	if (!mg)	282	if (!mg)
256	{	283	{
257	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	284	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
258	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	285	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
259	mg->mg_virtual = &vtbl_coro;	286	mg->mg_virtual = &vtbl_coro;
260	mg->mg_obj = (SV *)newAV ();	287	mg->mg_obj = (SV *)newAV ();
261	}	288	}
262		289
263	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);
264	}	296	}
265		297
266	#define SB do {	298	#define SB do {
267	#define SE } while (0)	299	#define SE } while (0)
268		300
269	#define LOAD(state) load_state(aTHX_ (state));
270	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
271
272	#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
273		302
274	static void	303	static void
275	load_state(pTHX_ Coro__State c)	304	load_perl (Coro__State c)
276	{	305	{
277	PL_dowarn = c->dowarn;	306	#define VAR(name,type) PL_ ## name = c->name;
278	PL_in_eval = c->in_eval;	307	# include "state.h"
279		308	#undef VAR
280	PL_curstackinfo = c->curstackinfo;
281	PL_curstack = c->curstack;
282	PL_mainstack = c->mainstack;
283	PL_stack_sp = c->stack_sp;
284	PL_op = c->op;
285	PL_curpad = c->curpad;
286	PL_comppad = c->comppad;
287	PL_compcv = c->compcv;
288	PL_stack_base = c->stack_base;
289	PL_stack_max = c->stack_max;
290	PL_tmps_stack = c->tmps_stack;
291	PL_tmps_floor = c->tmps_floor;
292	PL_tmps_ix = c->tmps_ix;
293	PL_tmps_max = c->tmps_max;
294	PL_markstack = c->markstack;
295	PL_markstack_ptr = c->markstack_ptr;
296	PL_markstack_max = c->markstack_max;
297	PL_scopestack = c->scopestack;
298	PL_scopestack_ix = c->scopestack_ix;
299	PL_scopestack_max = c->scopestack_max;
300	PL_savestack = c->savestack;
301	PL_savestack_ix = c->savestack_ix;
302	PL_savestack_max = c->savestack_max;
303	#if PERL_VERSION < 9
304	PL_retstack = c->retstack;
305	PL_retstack_ix = c->retstack_ix;
306	PL_retstack_max = c->retstack_max;
307	#endif
308	PL_curpm = c->curpm;
309	PL_curcop = c->curcop;
310		309
311	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	310	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
312	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	311	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
313	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	}
314		324
315	{	325	{
316	dSP;	326	dSP;
317	CV *cv;	327	CV *cv;
318		328
319	/* now do the ugly restore mess */	329	/* now do the ugly restore mess */
320	while ((cv = (CV *)POPs))	330	while ((cv = (CV *)POPs))
321	{	331	{
322	AV *padlist = (AV *)POPs;
323
324	if (padlist)
325	{
326	put_padlist (aTHX_ cv); /* mark this padlist as available */	332	put_padlist (cv); /* mark this padlist as available */
327	CvPADLIST(cv) = padlist;	333	CvDEPTH (cv) = PTR2IV (POPs);
328	}	334	CvPADLIST (cv) = (AV *)POPs;
329
330	++CvDEPTH(cv);
331	}	335	}
332		336
333	PUTBACK;	337	PUTBACK;
334	}	338	}
335	}	339	}
336		340
337	static void	341	static void
338	save_state(pTHX_ Coro__State c, int flags)	342	save_perl (Coro__State c)
339	{	343	{
340	{	344	{
341	dSP;	345	dSP;
342	I32 cxix = cxstack_ix;	346	I32 cxix = cxstack_ix;
343	PERL_CONTEXT *ccstk = cxstack;	347	PERL_CONTEXT *ccstk = cxstack;
…		…
354	{	358	{
355	while (cxix >= 0)	359	while (cxix >= 0)
356	{	360	{
357	PERL_CONTEXT *cx = &ccstk[cxix--];	361	PERL_CONTEXT *cx = &ccstk[cxix--];
358		362
359	if (CxTYPE(cx) == CXt_SUB)	363	if (CxTYPE (cx) == CXt_SUB)
360	{	364	{
361	CV *cv = cx->blk_sub.cv;	365	CV *cv = cx->blk_sub.cv;
		366
362	if (CvDEPTH(cv))	367	if (CvDEPTH (cv))
363	{	368	{
364	EXTEND (SP, CvDEPTH(cv)*2);	369	EXTEND (SP, 3);
365		370
366	while (--CvDEPTH(cv))
367	{
368	/* this tells the restore code to increment CvDEPTH */
369	PUSHs (Nullsv);
370	PUSHs ((SV *)cv);
371	}
372
373	PUSHs ((SV *)CvPADLIST(cv));	371	PUSHs ((SV *)CvPADLIST (cv));
		372	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
374	PUSHs ((SV *)cv);	373	PUSHs ((SV *)cv);
375		374
		375	CvDEPTH (cv) = 0;
376	get_padlist (aTHX_ cv);	376	get_padlist (cv);
377	}	377	}
378	}	378	}
379	#ifdef CXt_FORMAT	379	#ifdef CXt_FORMAT
380	else if (CxTYPE(cx) == CXt_FORMAT)	380	else if (CxTYPE (cx) == CXt_FORMAT)
381	{	381	{
382	/* 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? */
383	/* my bold guess is as a simple, plain sub... */	383	/* my bold guess is as a simple, plain sub... */
384	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");
385	}	385	}
…		…
395	}	395	}
396		396
397	PUTBACK;	397	PUTBACK;
398	}	398	}
399		399
400	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;
401	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	401	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
402	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;
403		404
404	c->dowarn = PL_dowarn;	405	#define VAR(name,type)c->name = PL_ ## name;
405	c->in_eval = PL_in_eval;	406	# include "state.h"
406		407	#undef VAR
407	c->curstackinfo = PL_curstackinfo;
408	c->curstack = PL_curstack;
409	c->mainstack = PL_mainstack;
410	c->stack_sp = PL_stack_sp;
411	c->op = PL_op;
412	c->curpad = PL_curpad;
413	c->comppad = PL_comppad;
414	c->compcv = PL_compcv;
415	c->stack_base = PL_stack_base;
416	c->stack_max = PL_stack_max;
417	c->tmps_stack = PL_tmps_stack;
418	c->tmps_floor = PL_tmps_floor;
419	c->tmps_ix = PL_tmps_ix;
420	c->tmps_max = PL_tmps_max;
421	c->markstack = PL_markstack;
422	c->markstack_ptr = PL_markstack_ptr;
423	c->markstack_max = PL_markstack_max;
424	c->scopestack = PL_scopestack;
425	c->scopestack_ix = PL_scopestack_ix;
426	c->scopestack_max = PL_scopestack_max;
427	c->savestack = PL_savestack;
428	c->savestack_ix = PL_savestack_ix;
429	c->savestack_max = PL_savestack_max;
430	#if PERL_VERSION < 9
431	c->retstack = PL_retstack;
432	c->retstack_ix = PL_retstack_ix;
433	c->retstack_max = PL_retstack_max;
434	#endif
435	c->curpm = PL_curpm;
436	c->curcop = PL_curcop;
437	}	408	}
438		409
439	/*	410	/*
440	* allocate various perl stacks. This is an exact copy	411	* allocate various perl stacks. This is an exact copy
441	* of perl.c:init_stacks, except that it uses less memory	412	* of perl.c:init_stacks, except that it uses less memory
442	* on the (sometimes correct) assumption that coroutines do	413	* on the (sometimes correct) assumption that coroutines do
443	* not usually need a lot of stackspace.	414	* not usually need a lot of stackspace.
444	*/	415	*/
445	static void	416	static void
446	coro_init_stacks (pTHX)	417	coro_init_stacks ()
447	{	418	{
448	LOCK;
449
450	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	419	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
451	PL_curstackinfo->si_type = PERLSI_MAIN;	420	PL_curstackinfo->si_type = PERLSI_MAIN;
452	PL_curstack = PL_curstackinfo->si_stack;	421	PL_curstack = PL_curstackinfo->si_stack;
453	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	422	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
454		423
455	PL_stack_base = AvARRAY(PL_curstack);	424	PL_stack_base = AvARRAY(PL_curstack);
456	PL_stack_sp = PL_stack_base;	425	PL_stack_sp = PL_stack_base;
457	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	426	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
458		427
459	New(50,PL_tmps_stack,96,SV*);	428	New(50,PL_tmps_stack,128,SV*);
460	PL_tmps_floor = -1;	429	PL_tmps_floor = -1;
461	PL_tmps_ix = -1;	430	PL_tmps_ix = -1;
462	PL_tmps_max = 96;	431	PL_tmps_max = 128;
463		432
464	New(54,PL_markstack,16,I32);	433	New(54,PL_markstack,32,I32);
465	PL_markstack_ptr = PL_markstack;	434	PL_markstack_ptr = PL_markstack;
466	PL_markstack_max = PL_markstack + 16;	435	PL_markstack_max = PL_markstack + 32;
467		436
468	#ifdef SET_MARK_OFFSET	437	#ifdef SET_MARK_OFFSET
469	SET_MARK_OFFSET;	438	SET_MARK_OFFSET;
470	#endif	439	#endif
471		440
472	New(54,PL_scopestack,16,I32);	441	New(54,PL_scopestack,32,I32);
473	PL_scopestack_ix = 0;	442	PL_scopestack_ix = 0;
474	PL_scopestack_max = 16;	443	PL_scopestack_max = 32;
475		444
476	New(54,PL_savestack,96,ANY);	445	New(54,PL_savestack,64,ANY);
477	PL_savestack_ix = 0;	446	PL_savestack_ix = 0;
478	PL_savestack_max = 96;	447	PL_savestack_max = 64;
479		448
480	#if PERL_VERSION < 9	449	#if !PERL_VERSION_ATLEAST (5,9,0)
481	New(54,PL_retstack,8,OP*);	450	New(54,PL_retstack,16,OP*);
482	PL_retstack_ix = 0;	451	PL_retstack_ix = 0;
483	PL_retstack_max = 8;	452	PL_retstack_max = 16;
484	#endif	453	#endif
485
486	UNLOCK;
487	}	454	}
488		455
489	/*	456	/*
490	* destroy the stacks, the callchain etc...	457	* destroy the stacks, the callchain etc...
491	*/	458	*/
492	static void	459	static void
493	destroy_stacks(pTHX)	460	coro_destroy_stacks ()
494	{	461	{
495	if (!IN_DESTRUCT)	462	if (!IN_DESTRUCT)
496	{	463	{
497	/* is this ugly, I ask? */	464	/* is this ugly, I ask? */
498	LEAVE_SCOPE (0);	465	LEAVE_SCOPE (0);
…		…
529		496
530	Safefree (PL_tmps_stack);	497	Safefree (PL_tmps_stack);
531	Safefree (PL_markstack);	498	Safefree (PL_markstack);
532	Safefree (PL_scopestack);	499	Safefree (PL_scopestack);
533	Safefree (PL_savestack);	500	Safefree (PL_savestack);
534	#if PERL_VERSION < 9	501	#if !PERL_VERSION_ATLEAST (5,9,0)
535	Safefree (PL_retstack);	502	Safefree (PL_retstack);
536	#endif	503	#endif
537	}	504	}
538		505
539	static void	506	static void
540	setup_coro (struct coro *coro)	507	setup_coro (struct coro *coro)
541	{	508	{
542	/*	509	/*
543	* emulate part of the perl startup here.	510	* emulate part of the perl startup here.
544	*/	511	*/
545	dTHX;
546	dSP;
547	UNOP myop;
548	SV *sub_init = (SV *)get_cv ("Coro::State::coro_init", FALSE);
549		512
550	coro_init_stacks (aTHX);	513	coro_init_stacks ();
551	/*PL_curcop = 0;*/	514
552	/*PL_in_eval = PL_in_eval;*/ /* inherit */	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
553	SvREFCNT_dec (GvAV (PL_defgv));	526	SvREFCNT_dec (GvAV (PL_defgv));
554	GvAV (PL_defgv) = coro->args; coro->args = 0;	527	GvAV (PL_defgv) = coro->args; coro->args = 0;
555		528
556	SPAGAIN;
557
558	Zero (&myop, 1, UNOP);	529	Zero (&myop, 1, LOGOP);
559	myop.op_next = Nullop;	530	myop.op_next = Nullop;
560	myop.op_flags = OPf_WANT_VOID;	531	myop.op_flags = OPf_WANT_VOID;
561		532
		533	PUSHMARK (SP);
		534	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		535	PUTBACK;
562	PL_op = (OP *)&myop;	536	PL_op = (OP *)&myop;
563
564	PUSHMARK(SP);
565	XPUSHs (sub_init);
566	PUTBACK;
567	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	537	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
568	SPAGAIN;	538	SPAGAIN;
		539	}
569		540
570	ENTER; /* necessary e.g. for dounwind */	541	ENTER; /* necessary e.g. for dounwind */
571	}	542	}
572		543
573	static void	544	static void
…		…
578	SvREFCNT_dec (coro_mortal);	549	SvREFCNT_dec (coro_mortal);
579	coro_mortal = 0;	550	coro_mortal = 0;
580	}	551	}
581	}	552	}
582		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	{
		558	dSP;
		559	LOGOP myop;
		560
		561	Zero (&myop, 1, LOGOP);
		562	myop.op_next = PL_op;
		563	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		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);
		572	SPAGAIN;
		573	}
		574
583	static void	575	static void
584	coro_run (void *arg)	576	coro_run (void *arg)
585	{	577	{
		578	/* coro_run is the alternative tail of transfer(), so unlock here. */
		579	UNLOCK;
		580
586	/*	581	/*
587	* this is a _very_ stripped down perl interpreter ;)	582	* this is a _very_ stripped down perl interpreter ;)
588	*/	583	*/
589	dTHX;
590
591	UNLOCK;
592
593	PL_top_env = &PL_start_env;	584	PL_top_env = &PL_start_env;
594		585
595	sv_setiv (get_sv ("Coro::State::cctx_stack", FALSE), PTR2IV ((coro_stack *)arg));	586	/* inject call to cctx_init */
596	sv_setiv (get_sv ("Coro::State::cctx_restartop", FALSE), PTR2IV (PL_op));	587	prepare_cctx ((coro_cctx *)arg);
597		588
598	/* continue at cctx_init, without entersub */
599	PL_restartop = CvSTART (get_cv ("Coro::State::cctx_init", FALSE));
600
601	/* somebody will hit me for both perl_run and PL_restart_op */	589	/* somebody will hit me for both perl_run and PL_restartop */
602	perl_run (aTHX_ PERL_GET_CONTEXT);	590	PL_restartop = PL_op;
		591	perl_run (PL_curinterp);
603		592
		593	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
604	abort ();	594	abort ();
605	}	595	}
606		596
607	static coro_stack *	597	static coro_cctx *
608	stack_new ()	598	cctx_new ()
609	{	599	{
610	coro_stack *stack;	600	coro_cctx *cctx;
611		601
		602	++cctx_count;
		603
612	New (0, stack, 1, coro_stack);	604	Newz (0, cctx, 1, coro_cctx);
613		605
614	#if HAVE_MMAP	606	#if HAVE_MMAP
615		607
616	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE; /* mmap should do allocate-on-write for us */	608	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		609	/* mmap supposedly does allocate-on-write for us */
617	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);	610	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
618		611
619	if (stack->sptr == (void *)-1)	612	if (cctx->sptr == (void *)-1)
620	{	613	{
621	perror ("FATAL: unable to mmap stack for coroutine");	614	perror ("FATAL: unable to mmap stack for coroutine");
622	_exit (EXIT_FAILURE);	615	_exit (EXIT_FAILURE);
623	}	616	}
624		617
		618	# if STACKGUARD
625	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);	619	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		620	# endif
626		621
627	#else	622	#else
628		623
629	stack->ssize = STACKSIZE * (long)sizeof (long);	624	cctx->ssize = STACKSIZE * (long)sizeof (long);
630	New (0, stack->sptr, STACKSIZE, long);	625	New (0, cctx->sptr, STACKSIZE, long);
631		626
632	if (!stack->sptr)	627	if (!cctx->sptr)
633	{	628	{
634	perror (stderr, "FATAL: unable to malloc stack for coroutine");	629	perror ("FATAL: unable to malloc stack for coroutine");
635	_exit (EXIT_FAILURE);	630	_exit (EXIT_FAILURE);
636	}	631	}
637		632
638	#endif	633	#endif
639		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
640	coro_create (&stack->cctx, coro_run, (void *)stack, stack->sptr, stack->ssize);	642	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
641		643
642	return stack;	644	return cctx;
643	}	645	}
644		646
645	static void	647	static void
646	stack_free (coro_stack *stack)	648	cctx_destroy (coro_cctx *cctx)
647	{	649	{
648	if (!stack || stack == main_stack)	650	if (!cctx)
649	return;	651	return;
650		652
		653	--cctx_count;
		654
		655	#if USE_VALGRIND
		656	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		657	#endif
		658
651	#if HAVE_MMAP	659	#if HAVE_MMAP
652	munmap (stack->sptr, stack->ssize);	660	munmap (cctx->sptr, cctx->ssize);
653	#else	661	#else
654	Safefree (stack->sptr);	662	Safefree (cctx->sptr);
655	#endif	663	#endif
656		664
657	Safefree (stack);	665	Safefree (cctx);
658	}	666	}
659		667
660	static coro_stack *stack_first;
661
662	static coro_stack *	668	static coro_cctx *
663	stack_get ()	669	cctx_get ()
664	{	670	{
665	coro_stack *stack;	671	coro_cctx *cctx;
666		672
667	if (stack_first)	673	if (cctx_first)
668	{	674	{
669	stack = stack_first;	675	cctx = cctx_first;
670	stack_first = stack->next;	676	cctx_first = cctx->next;
		677	--cctx_idle;
671	}	678	}
672	else	679	else
673	{	680	{
674	stack = stack_new ();	681	cctx = cctx_new ();
675	PL_op = PL_op->op_next;	682	PL_op = PL_op->op_next;
676	}	683	}
677		684
678	return stack;	685	return cctx;
679	}	686	}
680		687
681	static void	688	static void
682	stack_put (coro_stack *stack)	689	cctx_put (coro_cctx *cctx)
683	{	690	{
684	stack->next = stack_first;	691	/* free another cctx if overlimit */
685	stack_first = stack;	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;
686	}	705	}
687		706
688	/* never call directly, always through the coro_state_transfer global variable */	707	/* never call directly, always through the coro_state_transfer global variable */
689	static void	708	static void NOINLINE
690	transfer_impl (pTHX_ struct coro *prev, struct coro *next, int flags)	709	transfer (struct coro *prev, struct coro *next)
691	{	710	{
692	dSTACKLEVEL;	711	dSTACKLEVEL;
693		712
694	/* sometimes transfer is only called to set idle_sp */	713	/* sometimes transfer is only called to set idle_sp */
695	if (flags == TRANSFER_SET_STACKLEVEL)	714	if (!next)
		715	{
696	((coro_stack *)prev)->idle_sp = STACKLEVEL;	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	}
697	else if (prev != next)	719	else if (prev != next)
698	{	720	{
699	coro_stack *prev__stack;	721	coro_cctx *prev__cctx;
		722
		723	if (prev->flags & CF_NEW)
		724	{
		725	/* create a new empty context */
		726	Newz (0, prev->cctx, 1, coro_cctx);
		727	prev->cctx->inuse = 1;
		728	prev->flags &= ~CF_NEW;
		729	prev->flags |= CF_RUNNING;
		730	}
		731
		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;
700		741
701	LOCK;	742	LOCK;
702		743
703	if (next->mainstack)	744	if (next->flags & CF_NEW)
704	{	745	{
705	/* coroutine already started */	746	/* need to start coroutine */
706	SAVE (prev, flags);	747	next->flags &= ~CF_NEW;
707	LOAD (next);	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);
708	}	754	}
709	else	755	else
710	{	756	{
711	/* need to start coroutine */	757	/* coroutine already started */
712	/* first get rid of the old state */	758	save_perl (prev);
713	SAVE (prev, -1);	759	load_perl (next);
714	/* setup coroutine call */
715	setup_coro (next);
716	/* need a stack */
717	next->stack = 0;
718	}	760	}
719		761
720	prev__stack = prev->stack;	762	prev__cctx = prev->cctx;
721		763
722	/* possibly "free" the stack */	764	/* possibly "free" the cctx */
723	if (prev__stack->idle_sp == STACKLEVEL)	765	if (prev__cctx->idle_sp == STACKLEVEL)
724	{	766	{
725	stack_put (prev__stack);	767	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		768	assert (PL_top_env == prev__cctx->top_env);
		769
726	prev->stack = 0;	770	prev->cctx = 0;
		771
		772	cctx_put (prev__cctx);
		773	prev__cctx->inuse = 0;
727	}	774	}
728		775
729	if (!next->stack)	776	if (!next->cctx)
730	next->stack = stack_get ();
731
732	if (prev__stack != next->stack)
733	{	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	{
734	prev__stack->top_env = PL_top_env;	785	prev__cctx->top_env = PL_top_env;
735	PL_top_env = next->stack->top_env;	786	PL_top_env = next->cctx->top_env;
736	coro_transfer (&prev__stack->cctx, &next->stack->cctx);	787	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
737	}	788	}
738		789
739	free_coro_mortal ();	790	free_coro_mortal ();
740		791
741	UNLOCK;	792	UNLOCK;
742	}	793	}
743	}	794	}
744		795
745	/* use this function pointer to call the above function */
746	/* this is done to increase chances of the compiler not inlining the call */
747	/* not static to make it even harder for the compiler (and theoretically impossible in most cases */
748	void (*coro_state_transfer)(pTHX_ struct coro *prev, struct coro *next, int flags) = transfer_impl;
749
750	struct transfer_args	796	struct transfer_args
751	{	797	{
752	struct coro *prev, *next;	798	struct coro *prev, *next;
753	int flags;
754	};	799	};
755		800
756	#define TRANSFER(ta) coro_state_transfer ((ta).prev, (ta).next, (ta).flags)	801	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
757		802
758	static void	803	static void
759	coro_state_destroy (struct coro *coro)	804	coro_state_destroy (struct coro *coro)
760	{	805	{
761	if (coro->refcnt--)	806	if (coro->refcnt--)
762	return;	807	return;
763		808
764	if (coro->mainstack && coro->mainstack != main_mainstack)	809	if (coro->mainstack && coro->mainstack != main_mainstack)
765	{	810	{
766	struct coro temp;	811	struct coro temp;
		812	Zero (&temp, 1, struct coro);
		813	temp.save = CORO_SAVE_ALL;
767		814
768	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);	815	if (coro->flags & CF_RUNNING)
769	LOAD (aTHX_ coro);	816	croak ("FATAL: tried to destroy currently running coroutine");
770		817
		818	save_perl (&temp);
		819	load_perl (coro);
		820
771	destroy_stacks (aTHX);	821	coro_destroy_stacks ();
772		822
773	LOAD ((&temp)); /* this will get rid of defsv etc.. */	823	load_perl (&temp); /* this will get rid of defsv etc.. */
774		824
775	coro->mainstack = 0;	825	coro->mainstack = 0;
776	}	826	}
777		827
778	stack_free (coro->stack);	828	cctx_destroy (coro->cctx);
779	SvREFCNT_dec (coro->args);	829	SvREFCNT_dec (coro->args);
780	Safefree (coro);	830	Safefree (coro);
781	}	831	}
782		832
783	static int	833	static int
784	coro_state_clear (SV *sv, MAGIC *mg)	834	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
785	{	835	{
786	struct coro *coro = (struct coro *)mg->mg_ptr;	836	struct coro *coro = (struct coro *)mg->mg_ptr;
787	mg->mg_ptr = 0;	837	mg->mg_ptr = 0;
788		838
789	coro_state_destroy (coro);	839	coro_state_destroy (coro);
790		840
791	return 0;	841	return 0;
792	}	842	}
793		843
794	static int	844	static int
795	coro_state_dup (MAGIC *mg, CLONE_PARAMS *params)	845	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
796	{	846	{
797	struct coro *coro = (struct coro *)mg->mg_ptr;	847	struct coro *coro = (struct coro *)mg->mg_ptr;
798		848
799	++coro->refcnt;	849	++coro->refcnt;
800		850
801	return 0;	851	return 0;
802	}	852	}
803		853
804	static MGVTBL coro_state_vtbl = { 0, 0, 0, 0, coro_state_clear, 0, coro_state_dup, 0 };	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	};
805		864
806	static struct coro *	865	static struct coro *
807	SvSTATE (SV *coro)	866	SvSTATE (SV *coro)
808	{	867	{
809	HV *stash;	868	HV *stash;
…		…
824	assert (mg->mg_type == PERL_MAGIC_ext);	883	assert (mg->mg_type == PERL_MAGIC_ext);
825	return (struct coro *)mg->mg_ptr;	884	return (struct coro *)mg->mg_ptr;
826	}	885	}
827		886
828	static void	887	static void
829	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev, SV *next, int flags)	888	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
830	{	889	{
831	ta->prev = SvSTATE (prev);	890	ta->prev = SvSTATE (prev_sv);
832	ta->next = SvSTATE (next);	891	ta->next = SvSTATE (next_sv);
833	ta->flags = flags;
834	}	892	}
835		893
836	static void	894	static void
837	api_transfer (SV *prev, SV *next, int flags)	895	api_transfer (SV *prev_sv, SV *next_sv)
838	{	896	{
839	dTHX;
840	struct transfer_args ta;	897	struct transfer_args ta;
841		898
842	prepare_transfer (aTHX_ &ta, prev, next, flags);	899	prepare_transfer (&ta, prev_sv, next_sv);
843	TRANSFER (ta);	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;
844	}	913	}
845		914
846	/** Coro ********************************************************************/	915	/** Coro ********************************************************************/
847		916
848	#define PRIO_MAX 3	917	#define PRIO_MAX 3
…		…
851	#define PRIO_LOW -1	920	#define PRIO_LOW -1
852	#define PRIO_IDLE -3	921	#define PRIO_IDLE -3
853	#define PRIO_MIN -4	922	#define PRIO_MIN -4
854		923
855	/* for Coro.pm */	924	/* for Coro.pm */
856	static GV *coro_current, *coro_idle;	925	static SV *coro_current;
857	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];	926	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
858	static int coro_nready;	927	static int coro_nready;
859		928
860	static void	929	static void
861	coro_enq (pTHX_ SV *sv)	930	coro_enq (SV *coro_sv)
862	{	931	{
863	int prio;
864
865	if (SvTYPE (sv) != SVt_PVHV)
866	croak ("Coro::ready tried to enqueue something that is not a coroutine");
867
868	prio = SvSTATE (sv)->prio;
869
870	av_push (coro_ready [prio - PRIO_MIN], sv);	932	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
871	coro_nready++;	933	coro_nready++;
872	}	934	}
873		935
874	static SV *	936	static SV *
875	coro_deq (pTHX_ int min_prio)	937	coro_deq (int min_prio)
876	{	938	{
877	int prio = PRIO_MAX - PRIO_MIN;	939	int prio = PRIO_MAX - PRIO_MIN;
878		940
879	min_prio -= PRIO_MIN;	941	min_prio -= PRIO_MIN;
880	if (min_prio < 0)	942	if (min_prio < 0)
…		…
888	}	950	}
889		951
890	return 0;	952	return 0;
891	}	953	}
892		954
893	static void	955	static int
894	api_ready (SV *coro)	956	api_ready (SV *coro_sv)
895	{	957	{
896	dTHX;	958	struct coro *coro;
897		959
898	if (SvROK (coro))	960	if (SvROK (coro_sv))
899	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;
900		974
901	LOCK;	975	LOCK;
902	coro_enq (aTHX_ SvREFCNT_inc (coro));	976	coro_enq (SvREFCNT_inc (coro_sv));
903	UNLOCK;	977	UNLOCK;
904	}
905		978
		979	return 1;
		980	}
		981
906	static void	982	static int
		983	api_is_ready (SV *coro_sv)
		984	{
		985	return !!SvSTATE (coro_sv)->flags & CF_READY;
		986	}
		987
		988	static void
907	prepare_schedule (aTHX_ struct transfer_args *ta)	989	prepare_schedule (struct transfer_args *ta)
908	{	990	{
909	SV *current, *prev, *next;	991	SV *prev, *next;
910
911	LOCK;
912
913	current = GvSV (coro_current);
914		992
915	for (;;)	993	for (;;)
916	{	994	{
917	LOCK;	995	LOCK;
918
919	next = coro_deq (aTHX_ PRIO_MIN);	996	next = coro_deq (PRIO_MIN);
		997	UNLOCK;
920		998
921	if (next)	999	if (next)
922	break;	1000	break;
923		1001
924	UNLOCK;
925
926	{	1002	{
927	dSP;	1003	dSP;
928		1004
929	ENTER;	1005	ENTER;
930	SAVETMPS;	1006	SAVETMPS;
931		1007
932	PUSHMARK (SP);	1008	PUSHMARK (SP);
933	PUTBACK;	1009	PUTBACK;
934	call_sv (GvSV (coro_idle), G_DISCARD);	1010	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
935		1011
936	FREETMPS;	1012	FREETMPS;
937	LEAVE;	1013	LEAVE;
938	}	1014	}
939	}	1015	}
940		1016
941	prev = SvRV (current);	1017	prev = SvRV (coro_current);
942	SvRV (current) = next;	1018	SvRV_set (coro_current, next);
943		1019
944	/* free this only after the transfer */	1020	/* free this only after the transfer */
		1021	LOCK;
945	free_coro_mortal ();	1022	free_coro_mortal ();
		1023	UNLOCK;
946	coro_mortal = prev;	1024	coro_mortal = prev;
947		1025
		1026	assert (!SvROK(prev));//D
		1027	assert (!SvROK(next));//D
		1028
948	ta->prev = SvSTATE (prev);	1029	ta->prev = SvSTATE (prev);
949	ta->next = SvSTATE (next);	1030	ta->next = SvSTATE (next);
950	ta->flags = TRANSFER_SAVE_ALL;
951		1031
952	UNLOCK;	1032	assert (ta->next->flags & CF_READY);
		1033	ta->next->flags &= ~CF_READY;
953	}	1034	}
954		1035
955	static void	1036	static void
956	prepare_cede (aTHX_ struct transfer_args *ta)	1037	prepare_cede (struct transfer_args *ta)
957	{	1038	{
958	LOCK;	1039	api_ready (coro_current);
959	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));
960	UNLOCK;
961		1040
962	prepare_schedule (ta);	1041	prepare_schedule (ta);
963	}	1042	}
964		1043
965	static void	1044	static void
966	api_schedule (void)	1045	api_schedule (void)
967	{	1046	{
968	dTHX;
969	struct transfer_args ta;	1047	struct transfer_args ta;
970		1048
971	prepare_schedule (&ta);	1049	prepare_schedule (&ta);
972	TRANSFER (ta);	1050	TRANSFER (ta);
973	}	1051	}
974		1052
975	static void	1053	static void
976	api_cede (void)	1054	api_cede (void)
977	{	1055	{
978	dTHX;
979	struct transfer_args ta;	1056	struct transfer_args ta;
980		1057
981	prepare_cede (&ta);	1058	prepare_cede (&ta);
982	TRANSFER (ta);	1059	TRANSFER (ta);
983	}	1060	}
…		…
993	#endif	1070	#endif
994	BOOT_PAGESIZE;	1071	BOOT_PAGESIZE;
995		1072
996	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1073	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
997		1074
998	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1075	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
999	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1076	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
1000	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));
		1079	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
1001		1080
1002	main_mainstack = PL_mainstack;	1081	main_mainstack = PL_mainstack;
1003		1082
1004	coroapi.ver = CORO_API_VERSION;	1083	coroapi.ver = CORO_API_VERSION;
1005	coroapi.transfer = api_transfer;	1084	coroapi.transfer = api_transfer;
1006
1007	Newz (0, main_stack, 1, coro_stack);
1008	main_stack->idle_sp = (void *)-1;
1009		1085
1010	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));	1086	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
1011	}	1087	}
1012		1088
1013	SV *	1089	SV *
…		…
1018	HV *hv;	1094	HV *hv;
1019	int i;	1095	int i;
1020		1096
1021	Newz (0, coro, 1, struct coro);	1097	Newz (0, coro, 1, struct coro);
1022	coro->args = newAV ();	1098	coro->args = newAV ();
		1099	coro->save = CORO_SAVE_ALL;
		1100	coro->flags = CF_NEW;
1023		1101
1024	hv = newHV ();	1102	hv = newHV ();
1025	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;	1103	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
1026	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));	1104	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
1027		1105
1028	for (i = 1; i < items; i++)	1106	for (i = 1; i < items; i++)
1029	av_push (coro->args, newSVsv (ST (i)));	1107	av_push (coro->args, newSVsv (ST (i)));
1030
1031	coro->stack = main_stack;
1032	/*coro->mainstack = 0; *//*actual work is done inside transfer */
1033	/*coro->stack = 0;*/
1034	}	1108	}
1035	OUTPUT:	1109	OUTPUT:
1036	RETVAL	1110	RETVAL
1037		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
1038	void	1119	void
1039	transfer (...)	1120	_set_stacklevel (...)
1040	ALIAS:	1121	ALIAS:
1041	Coro::schedule = 1	1122	Coro::State::transfer = 1
1042	Coro::cede = 2	1123	Coro::schedule = 2
1043	_set_stacklevel = 3	1124	Coro::cede = 3
1044	CODE:	1125	CODE:
1045	{	1126	{
1046	struct transfer_args ta;	1127	struct transfer_args ta;
1047		1128
1048	switch (ix)	1129	switch (ix)
1049	{	1130	{
1050	case 0:	1131	case 0:
1051	if (items != 3)	1132	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
1052	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);	1133	ta.next = 0;
1053
1054	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
1055	break;	1134	break;
1056		1135
1057	case 1:	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:
1058	prepare_schedule (&ta);	1144	prepare_schedule (&ta);
1059	break;	1145	break;
1060		1146
1061	case 2:	1147	case 3:
1062	prepare_cede (&ta);	1148	prepare_cede (&ta);
1063	break;
1064
1065	case 3:
1066	ta.prev = (struct coro *)INT2PTR (coro_stack *, SvIV (ST (0)));
1067	ta.next = 0;
1068	ta.flags = TRANSFER_SET_STACKLEVEL;
1069	break;	1149	break;
1070	}	1150	}
1071		1151
1072	TRANSFER (ta);	1152	TRANSFER (ta);
1073	}	1153	}
…		…
1081	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);	1161	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
1082		1162
1083	++coro_src->refcnt;	1163	++coro_src->refcnt;
1084	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;	1164	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
1085	}	1165	}
1086
1087	void
1088	_nonlocal_goto (IV nextop)
1089	CODE:
1090	/* uuh, somebody will kill me again for this */
1091	PL_op->op_next = INT2PTR (OP *, nextop);
1092		1166
1093	void	1167	void
1094	_exit (code)	1168	_exit (code)
1095	int code	1169	int code
1096	PROTOTYPE: $	1170	PROTOTYPE: $
1097	CODE:	1171	CODE:
1098	_exit (code);	1172	_exit (code);
1099		1173
1100	MODULE = Coro::State PACKAGE = Coro::Cont	1174	int
		1175	cctx_count ()
		1176	CODE:
		1177	RETVAL = cctx_count;
		1178	OUTPUT:
		1179	RETVAL
1101		1180
1102	void	1181	int
1103	yield (...)	1182	cctx_idle ()
1104	PROTOTYPE: @	1183	CODE:
1105	CODE:	1184	RETVAL = cctx_idle;
1106	{	1185	OUTPUT:
1107	SV *yieldstack;	1186	RETVAL
1108	SV *sv;
1109	AV *defav = GvAV (PL_defgv);
1110	struct coro *prev, *next;
1111
1112	yieldstack = *hv_fetch (
1113	(HV *)SvRV (GvSV (coro_current)),
1114	"yieldstack", sizeof ("yieldstack") - 1,
1115	0
1116	);
1117
1118	/* set up @_ -- ugly */
1119	av_clear (defav);
1120	av_fill (defav, items - 1);
1121	while (items--)
1122	av_store (defav, items, SvREFCNT_inc (ST(items)));
1123
1124	sv = av_pop ((AV *)SvRV (yieldstack));
1125	prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
1126	next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
1127	SvREFCNT_dec (sv);
1128
1129	coro_state_transfer (aTHX_ prev, next, 0);
1130	}
1131		1187
1132	MODULE = Coro::State PACKAGE = Coro	1188	MODULE = Coro::State PACKAGE = Coro
1133		1189
1134	BOOT:	1190	BOOT:
1135	{	1191	{
…		…
1142	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1198	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1143	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));	1199	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1144	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1200	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1145	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));	1201	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1146		1202
1147	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1203	coro_current = get_sv ("Coro::current", FALSE);
1148	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1204	SvREADONLY_on (coro_current);
1149		1205
1150	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1206	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1151	coro_ready[i] = newAV ();	1207	coro_ready[i] = newAV ();
1152		1208
1153	{	1209	{
1154	SV *sv = perl_get_sv("Coro::API", 1);	1210	SV *sv = perl_get_sv("Coro::API", 1);
1155		1211
1156	coroapi.schedule = api_schedule;	1212	coroapi.schedule = api_schedule;
		1213	coroapi.save = api_save;
1157	coroapi.cede = api_cede;	1214	coroapi.cede = api_cede;
1158	coroapi.ready = api_ready;	1215	coroapi.ready = api_ready;
		1216	coroapi.is_ready = api_is_ready;
1159	coroapi.nready = &coro_nready;	1217	coroapi.nready = &coro_nready;
1160	coroapi.current = coro_current;	1218	coroapi.current = coro_current;
1161		1219
1162	GCoroAPI = &coroapi;	1220	GCoroAPI = &coroapi;
1163	sv_setiv (sv, (IV)&coroapi);	1221	sv_setiv (sv, (IV)&coroapi);
1164	SvREADONLY_on (sv);	1222	SvREADONLY_on (sv);
1165	}	1223	}
1166	}	1224	}
		1225
		1226	void
		1227	_set_current (SV *current)
		1228	PROTOTYPE: $
		1229	CODE:
		1230	SvREFCNT_dec (SvRV (coro_current));
		1231	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1167		1232
1168	int	1233	int
1169	prio (Coro::State coro, int newprio = 0)	1234	prio (Coro::State coro, int newprio = 0)
1170	ALIAS:	1235	ALIAS:
1171	nice = 1	1236	nice = 1
…		…
1183		1248
1184	coro->prio = newprio;	1249	coro->prio = newprio;
1185	}	1250	}
1186	}	1251	}
1187		1252
1188	void	1253	SV *
1189	ready (SV *self)	1254	ready (SV *self)
1190	PROTOTYPE: $	1255	PROTOTYPE: $
1191	CODE:	1256	CODE:
1192	api_ready (self);	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
1193		1268
1194	int	1269	int
1195	nready (...)	1270	nready (...)
1196	PROTOTYPE:	1271	PROTOTYPE:
1197	CODE:	1272	CODE:
…		…
1203		1278
1204	SV *	1279	SV *
1205	_get_state ()	1280	_get_state ()
1206	CODE:	1281	CODE:
1207	{	1282	{
1208	struct {	1283	struct io_state *data;
1209	int errorno;
1210	int laststype;
1211	int laststatval;
1212	Stat_t statcache;
1213	} data;
1214		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
1215	data.errorno = errno;	1290	data->errorno = errno;
1216	data.laststype = PL_laststype;	1291	data->laststype = PL_laststype;
1217	data.laststatval = PL_laststatval;	1292	data->laststatval = PL_laststatval;
1218	data.statcache = PL_statcache;	1293	data->statcache = PL_statcache;
1219
1220	RETVAL = newSVpvn ((char *)&data, sizeof data);
1221	}	1294	}
1222	OUTPUT:	1295	OUTPUT:
1223	RETVAL	1296	RETVAL
1224		1297
1225	void	1298	void
1226	_set_state (char *data_)	1299	_set_state (char *data_)
1227	PROTOTYPE: $	1300	PROTOTYPE: $
1228	CODE:	1301	CODE:
1229	{	1302	{
1230	struct {	1303	struct io_state *data = (void *)data_;
1231	int errorno;
1232	int laststype;
1233	int laststatval;
1234	Stat_t statcache;
1235	} *data = (void *)data_;
1236		1304
1237	errno = data->errorno;	1305	errno = data->errorno;
1238	PL_laststype = data->laststype;	1306	PL_laststype = data->laststype;
1239	PL_laststatval = data->laststatval;	1307	PL_laststatval = data->laststatval;
1240	PL_statcache = data->statcache;	1308	PL_statcache = data->statcache;
1241	}	1309	}
		1310

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