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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.99 by root, Sun Nov 26 23:53:20 2006 UTC vs.
Revision 1.136 by root, Fri Jan 12 01:05:55 2007 UTC

…		…
4	#include "perl.h"	4	#include "perl.h"
5	#include "XSUB.h"	5	#include "XSUB.h"
6		6
7	#include "patchlevel.h"	7	#include "patchlevel.h"
8		8
9	#if PERL_VERSION < 6	9	#include <stdio.h>
		10	#include <errno.h>
		11	#include <assert.h>
		12
		13	#ifdef HAVE_MMAP
		14	# include <unistd.h>
		15	# include <sys/mman.h>
		16	# ifndef MAP_ANONYMOUS
		17	# ifdef MAP_ANON
		18	# define MAP_ANONYMOUS MAP_ANON
		19	# else
		20	# undef HAVE_MMAP
		21	# endif
		22	# endif
		23	# include <limits.h>
		24	# ifndef PAGESIZE
		25	# define PAGESIZE pagesize
		26	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		27	static long pagesize;
		28	# else
		29	# define BOOT_PAGESIZE (void)0
		30	# endif
		31	#else
		32	# define PAGESIZE 0
		33	# define BOOT_PAGESIZE (void)0
		34	#endif
		35
		36	#if USE_VALGRIND
		37	# include <valgrind/valgrind.h>
		38	#endif
		39
		40	/* the maximum number of idle cctx that will be pooled */
		41	#define MAX_IDLE_CCTX 8
		42
		43	#define PERL_VERSION_ATLEAST(a,b,c) \
		44	(PERL_REVISION > (a) \
		45	|| (PERL_REVISION == (a) \
		46	&& (PERL_VERSION > (b) \
		47	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		48
		49	#if !PERL_VERSION_ATLEAST (5,6,0)
10	# ifndef PL_ppaddr	50	# ifndef PL_ppaddr
11	# define PL_ppaddr ppaddr	51	# define PL_ppaddr ppaddr
12	# endif	52	# endif
13	# ifndef call_sv	53	# ifndef call_sv
14	# define call_sv perl_call_sv	54	# define call_sv perl_call_sv
…		…
25	# ifndef IS_PADCONST	65	# ifndef IS_PADCONST
26	# define IS_PADCONST(v) 0	66	# define IS_PADCONST(v) 0
27	# endif	67	# endif
28	#endif	68	#endif
29		69
30	#include <stdio.h>	70	/* 5.8.7 */
31	#include <errno.h>	71	#ifndef SvRV_set
		72	# define SvRV_set(s,v) SvRV(s) = (v)
		73	#endif
32		74
33	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64	75	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
34	# undef STACKGUARD	76	# undef STACKGUARD
35	#endif	77	#endif
36		78
37	#ifndef STACKGUARD	79	#ifndef STACKGUARD
38	# define STACKGUARD 0	80	# define STACKGUARD 0
39	#endif	81	#endif
40		82
41	#ifdef HAVE_MMAP	83	/* prefer perl internal functions over our own? */
42	# include <unistd.h>	84	#ifndef PREFER_PERL_FUNCTIONS
43	# include <sys/mman.h>	85	# define PREFER_PERL_FUNCTIONS 0
44	# ifndef MAP_ANONYMOUS
45	# ifdef MAP_ANON
46	# define MAP_ANONYMOUS MAP_ANON
47	# else
48	# undef HAVE_MMAP
49	# endif
50	# endif
51	# include <limits.h>
52	# ifndef PAGESIZE
53	# define PAGESIZE pagesize
54	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
55	static long pagesize;
56	# else
57	# define BOOT_PAGESIZE
58	# endif
59	#endif	86	#endif
60		87
61	/* The next macro should declare a variable stacklevel that contains and approximation	88	/* The next macro should declare a variable stacklevel that contains and approximation
62	* to the current C stack pointer. Its property is that it changes with each call	89	* to the current C stack pointer. Its property is that it changes with each call
63	* and should be unique. */	90	* and should be unique. */
64	#define dSTACKLEVEL int stacklevel	91	#define dSTACKLEVEL int stacklevel
65	#define STACKLEVEL ((void *)&stacklevel)	92	#define STACKLEVEL ((void *)&stacklevel)
66		93
67	#define IN_DESTRUCT (PL_main_cv == Nullcv)	94	#define IN_DESTRUCT (PL_main_cv == Nullcv)
68		95
		96	#if __GNUC__ >= 3
		97	# define attribute(x) __attribute__(x)
		98	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		99	#else
		100	# define attribute(x)
		101	# define BARRIER
		102	#endif
		103
		104	#define NOINLINE attribute ((noinline))
		105
69	#include "CoroAPI.h"	106	#include "CoroAPI.h"
70
71	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
72		107
73	#ifdef USE_ITHREADS	108	#ifdef USE_ITHREADS
74	static perl_mutex coro_mutex;	109	static perl_mutex coro_mutex;
75	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)	110	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
76	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)	111	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
77	#else	112	#else
78	# define LOCK (void)0	113	# define LOCK (void)0
79	# define UNLOCK (void)0	114	# define UNLOCK (void)0
80	#endif	115	#endif
81		116
		117	/* helper storage struct for Coro::AIO */
		118	struct io_state
		119	{
		120	int errorno;
		121	I32 laststype;
		122	int laststatval;
		123	Stat_t statcache;
		124	};
		125
82	static struct CoroAPI coroapi;	126	static struct CoroAPI coroapi;
83	static AV *main_mainstack; /* used to differentiate between $main and others */	127	static AV *main_mainstack; /* used to differentiate between $main and others */
84	static HV *coro_state_stash, *coro_stash;	128	static HV *coro_state_stash, *coro_stash;
85	static SV *coro_mortal; /* will be freed after next transfer */	129	static SV *coro_mortal; /* will be freed after next transfer */
86		130
		131	static struct coro_cctx *cctx_first;
		132	static int cctx_count, cctx_idle;
		133
87	/* this is a structure representing a c-level coroutine */	134	/* this is a structure representing a c-level coroutine */
88	typedef struct coro_stack {	135	typedef struct coro_cctx {
89	struct coro_stack *next;	136	struct coro_cctx *next;
90		137
91	/* the stack */	138	/* the stack */
92	void *sptr;	139	void *sptr;
93	long ssize; /* positive == mmap, otherwise malloc */	140	long ssize; /* positive == mmap, otherwise malloc */
94		141
95	/* cpu state */	142	/* cpu state */
96	void *idle_sp; /* sp of top-level transfer/schedule/cede call */	143	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		144	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
97	JMPENV *top_env;	145	JMPENV *top_env;
98	coro_context cctx;	146	coro_context cctx;
99	} coro_stack;	147
		148	int inuse;
		149
		150	#if USE_VALGRIND
		151	int valgrind_id;
		152	#endif
		153	} coro_cctx;
		154
		155	enum {
		156	CF_RUNNING = 0x0001, /* coroutine is running */
		157	CF_READY = 0x0002, /* coroutine is ready */
		158	CF_NEW = 0x0004, /* has never been switched to */
		159	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
		160	};
100		161
101	/* this is a structure representing a perl-level coroutine */	162	/* this is a structure representing a perl-level coroutine */
102	struct coro {	163	struct coro {
103	/* the c coroutine allocated to this perl coroutine, if any */	164	/* the c coroutine allocated to this perl coroutine, if any */
104	coro_stack *stack;	165	coro_cctx *cctx;
105		166
106	/* data associated with this coroutine (initial args) */	167	/* data associated with this coroutine (initial args) */
107	AV *args;	168	AV *args;
108	int refcnt;	169	int refcnt;
		170	int save; /* CORO_SAVE flags */
		171	int flags; /* CF_ flags */
109		172
110	/* optionally saved, might be zero */	173	/* optionally saved, might be zero */
111	AV *defav;	174	AV *defav; /* @_ */
112	SV *defsv;	175	SV *defsv; /* $_ */
113	SV *errsv;	176	SV *errsv; /* $@ */
		177	SV *irssv; /* $/ */
		178	SV *irssv_sv; /* real $/ cache */
114		179
115	/* saved global state not related to stacks */	180	#define VAR(name,type) type name;
116	U8 dowarn;	181	# include "state.h"
117	I32 in_eval;	182	#undef VAR
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		183
149	/* coro process data */	184	/* coro process data */
150	int prio;	185	int prio;
151	};	186	};
152		187
…		…
159	AV *padlist = CvPADLIST (cv);	194	AV *padlist = CvPADLIST (cv);
160	AV *newpadlist, *newpad;	195	AV *newpadlist, *newpad;
161		196
162	newpadlist = newAV ();	197	newpadlist = newAV ();
163	AvREAL_off (newpadlist);	198	AvREAL_off (newpadlist);
164	#if PERL_VERSION < 9	199	#if PERL_VERSION_ATLEAST (5,9,0)
		200	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		201	#else
165	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);	202	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
166	#else
167	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
168	#endif	203	#endif
169	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];	204	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
170	--AvFILLp (padlist);	205	--AvFILLp (padlist);
171		206
172	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));	207	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
…		…
216		251
217	#define PERL_MAGIC_coro PERL_MAGIC_ext	252	#define PERL_MAGIC_coro PERL_MAGIC_ext
218		253
219	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	254	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
220		255
		256	#define CORO_MAGIC(cv) \
		257	SvMAGIC (cv) \
		258	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		259	? SvMAGIC (cv) \
		260	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		261	: 0
		262
221	/* the next two functions merely cache the padlists */	263	/* the next two functions merely cache the padlists */
222	static void	264	static void
223	get_padlist (CV *cv)	265	get_padlist (CV *cv)
224	{	266	{
225	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	267	MAGIC *mg = CORO_MAGIC (cv);
		268	AV *av;
226		269
227	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	270	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
228	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	271	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
229	else	272	else
230	{	273	{
231	#if 0	274	#if PREFER_PERL_FUNCTIONS
232	/* this is probably cleaner, but also slower? */	275	/* this is probably cleaner, but also slower? */
233	CV *cp = Perl_cv_clone (cv);	276	CV *cp = Perl_cv_clone (cv);
234	CvPADLIST (cv) = CvPADLIST (cp);	277	CvPADLIST (cv) = CvPADLIST (cp);
235	CvPADLIST (cp) = 0;	278	CvPADLIST (cp) = 0;
236	SvREFCNT_dec (cp);	279	SvREFCNT_dec (cp);
…		…
241	}	284	}
242		285
243	static void	286	static void
244	put_padlist (CV *cv)	287	put_padlist (CV *cv)
245	{	288	{
246	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	289	MAGIC *mg = CORO_MAGIC (cv);
		290	AV *av;
247		291
248	if (!mg)	292	if (!mg)
249	{	293	{
250	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	294	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
251	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	295	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
252	mg->mg_virtual = &vtbl_coro;	296	mg->mg_virtual = &vtbl_coro;
253	mg->mg_obj = (SV *)newAV ();	297	mg->mg_obj = (SV *)newAV ();
254	}	298	}
255		299
256	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));	300	av = (AV *)mg->mg_obj;
		301
		302	if (AvFILLp (av) >= AvMAX (av))
		303	av_extend (av, AvMAX (av) + 1);
		304
		305	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
257	}	306	}
258		307
259	#define SB do {	308	#define SB do {
260	#define SE } while (0)	309	#define SE } while (0)
261		310
262	#define LOAD(state) load_state((state));
263	#define SAVE(state,flags) save_state((state),(flags));
264
265	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	311	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
266		312
267	static void	313	static void
268	load_state(Coro__State c)	314	load_perl (Coro__State c)
269	{	315	{
270	PL_dowarn = c->dowarn;	316	#define VAR(name,type) PL_ ## name = c->name;
271	PL_in_eval = c->in_eval;	317	# include "state.h"
272		318	#undef VAR
273	PL_curstackinfo = c->curstackinfo;
274	PL_curstack = c->curstack;
275	PL_mainstack = c->mainstack;
276	PL_stack_sp = c->stack_sp;
277	PL_op = c->op;
278	PL_curpad = c->curpad;
279	PL_comppad = c->comppad;
280	PL_compcv = c->compcv;
281	PL_stack_base = c->stack_base;
282	PL_stack_max = c->stack_max;
283	PL_tmps_stack = c->tmps_stack;
284	PL_tmps_floor = c->tmps_floor;
285	PL_tmps_ix = c->tmps_ix;
286	PL_tmps_max = c->tmps_max;
287	PL_markstack = c->markstack;
288	PL_markstack_ptr = c->markstack_ptr;
289	PL_markstack_max = c->markstack_max;
290	PL_scopestack = c->scopestack;
291	PL_scopestack_ix = c->scopestack_ix;
292	PL_scopestack_max = c->scopestack_max;
293	PL_savestack = c->savestack;
294	PL_savestack_ix = c->savestack_ix;
295	PL_savestack_max = c->savestack_max;
296	#if PERL_VERSION < 9
297	PL_retstack = c->retstack;
298	PL_retstack_ix = c->retstack_ix;
299	PL_retstack_max = c->retstack_max;
300	#endif
301	PL_curpm = c->curpm;
302	PL_curcop = c->curcop;
303		319
304	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	320	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
305	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	321	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
306	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	322	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		323	if (c->irssv)
		324	{
		325	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		326	SvREFCNT_dec (c->irssv);
		327	else
		328	{
		329	REPLACE_SV (PL_rs, c->irssv);
		330	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		331	sv_setsv (c->irssv_sv, PL_rs);
		332	}
		333	}
307		334
308	{	335	{
309	dSP;	336	dSP;
310	CV *cv;	337	CV *cv;
311		338
312	/* now do the ugly restore mess */	339	/* now do the ugly restore mess */
313	while ((cv = (CV *)POPs))	340	while ((cv = (CV *)POPs))
314	{	341	{
315	AV *padlist = (AV *)POPs;
316
317	if (padlist)
318	{
319	put_padlist (cv); /* mark this padlist as available */	342	put_padlist (cv); /* mark this padlist as available */
320	CvPADLIST(cv) = padlist;	343	CvDEPTH (cv) = PTR2IV (POPs);
321	}	344	CvPADLIST (cv) = (AV *)POPs;
322
323	++CvDEPTH(cv);
324	}	345	}
325		346
326	PUTBACK;	347	PUTBACK;
327	}	348	}
328	}	349	}
329		350
330	static void	351	static void
331	save_state(Coro__State c, int flags)	352	save_perl (Coro__State c)
332	{	353	{
333	{	354	{
334	dSP;	355	dSP;
335	I32 cxix = cxstack_ix;	356	I32 cxix = cxstack_ix;
336	PERL_CONTEXT *ccstk = cxstack;	357	PERL_CONTEXT *ccstk = cxstack;
…		…
339	/*	360	/*
340	* the worst thing you can imagine happens first - we have to save	361	* the worst thing you can imagine happens first - we have to save
341	* (and reinitialize) all cv's in the whole callchain :(	362	* (and reinitialize) all cv's in the whole callchain :(
342	*/	363	*/
343		364
		365	EXTEND (SP, 3 + 1);
344	PUSHs (Nullsv);	366	PUSHs (Nullsv);
345	/* this loop was inspired by pp_caller */	367	/* this loop was inspired by pp_caller */
346	for (;;)	368	for (;;)
347	{	369	{
348	while (cxix >= 0)	370	while (cxix >= 0)
349	{	371	{
350	PERL_CONTEXT *cx = &ccstk[cxix--];	372	PERL_CONTEXT *cx = &ccstk[cxix--];
351		373
352	if (CxTYPE(cx) == CXt_SUB)	374	if (CxTYPE (cx) == CXt_SUB)
353	{	375	{
354	CV *cv = cx->blk_sub.cv;	376	CV *cv = cx->blk_sub.cv;
		377
355	if (CvDEPTH(cv))	378	if (CvDEPTH (cv))
356	{	379	{
357	EXTEND (SP, CvDEPTH(cv)*2);	380	EXTEND (SP, 3);
358
359	while (--CvDEPTH(cv))
360	{
361	/* this tells the restore code to increment CvDEPTH */
362	PUSHs (Nullsv);
363	PUSHs ((SV *)cv);
364	}
365
366	PUSHs ((SV *)CvPADLIST(cv));	381	PUSHs ((SV *)CvPADLIST (cv));
		382	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
367	PUSHs ((SV *)cv);	383	PUSHs ((SV *)cv);
368		384
		385	CvDEPTH (cv) = 0;
369	get_padlist (cv);	386	get_padlist (cv);
370	}	387	}
371	}	388	}
372	#ifdef CXt_FORMAT
373	else if (CxTYPE(cx) == CXt_FORMAT)
374	{
375	/* I never used formats, so how should I know how these are implemented? */
376	/* my bold guess is as a simple, plain sub... */
377	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
378	}
379	#endif
380	}	389	}
381		390
382	if (top_si->si_type == PERLSI_MAIN)	391	if (top_si->si_type == PERLSI_MAIN)
383	break;	392	break;
384		393
…		…
388	}	397	}
389		398
390	PUTBACK;	399	PUTBACK;
391	}	400	}
392		401
393	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	402	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
394	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	403	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
395	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	404	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		405	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
396		406
397	c->dowarn = PL_dowarn;	407	#define VAR(name,type)c->name = PL_ ## name;
398	c->in_eval = PL_in_eval;	408	# include "state.h"
399		409	#undef VAR
400	c->curstackinfo = PL_curstackinfo;
401	c->curstack = PL_curstack;
402	c->mainstack = PL_mainstack;
403	c->stack_sp = PL_stack_sp;
404	c->op = PL_op;
405	c->curpad = PL_curpad;
406	c->comppad = PL_comppad;
407	c->compcv = PL_compcv;
408	c->stack_base = PL_stack_base;
409	c->stack_max = PL_stack_max;
410	c->tmps_stack = PL_tmps_stack;
411	c->tmps_floor = PL_tmps_floor;
412	c->tmps_ix = PL_tmps_ix;
413	c->tmps_max = PL_tmps_max;
414	c->markstack = PL_markstack;
415	c->markstack_ptr = PL_markstack_ptr;
416	c->markstack_max = PL_markstack_max;
417	c->scopestack = PL_scopestack;
418	c->scopestack_ix = PL_scopestack_ix;
419	c->scopestack_max = PL_scopestack_max;
420	c->savestack = PL_savestack;
421	c->savestack_ix = PL_savestack_ix;
422	c->savestack_max = PL_savestack_max;
423	#if PERL_VERSION < 9
424	c->retstack = PL_retstack;
425	c->retstack_ix = PL_retstack_ix;
426	c->retstack_max = PL_retstack_max;
427	#endif
428	c->curpm = PL_curpm;
429	c->curcop = PL_curcop;
430	}	410	}
431		411
432	/*	412	/*
433	* allocate various perl stacks. This is an exact copy	413	* allocate various perl stacks. This is an exact copy
434	* of perl.c:init_stacks, except that it uses less memory	414	* of perl.c:init_stacks, except that it uses less memory
435	* on the (sometimes correct) assumption that coroutines do	415	* on the (sometimes correct) assumption that coroutines do
436	* not usually need a lot of stackspace.	416	* not usually need a lot of stackspace.
437	*/	417	*/
		418	#if PREFER_PERL_FUNCTIONS
		419	# define coro_init_stacks init_stacks
		420	#else
438	static void	421	static void
439	coro_init_stacks ()	422	coro_init_stacks ()
440	{	423	{
441	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	424	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
442	PL_curstackinfo->si_type = PERLSI_MAIN;	425	PL_curstackinfo->si_type = PERLSI_MAIN;
443	PL_curstack = PL_curstackinfo->si_stack;	426	PL_curstack = PL_curstackinfo->si_stack;
444	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	427	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
445		428
446	PL_stack_base = AvARRAY(PL_curstack);	429	PL_stack_base = AvARRAY(PL_curstack);
447	PL_stack_sp = PL_stack_base;	430	PL_stack_sp = PL_stack_base;
448	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	431	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
449		432
450	New(50,PL_tmps_stack,96,SV*);	433	New(50,PL_tmps_stack,128,SV*);
451	PL_tmps_floor = -1;	434	PL_tmps_floor = -1;
452	PL_tmps_ix = -1;	435	PL_tmps_ix = -1;
453	PL_tmps_max = 96;	436	PL_tmps_max = 128;
454		437
455	New(54,PL_markstack,16,I32);	438	New(54,PL_markstack,32,I32);
456	PL_markstack_ptr = PL_markstack;	439	PL_markstack_ptr = PL_markstack;
457	PL_markstack_max = PL_markstack + 16;	440	PL_markstack_max = PL_markstack + 32;
458		441
459	#ifdef SET_MARK_OFFSET	442	#ifdef SET_MARK_OFFSET
460	SET_MARK_OFFSET;	443	SET_MARK_OFFSET;
461	#endif	444	#endif
462		445
463	New(54,PL_scopestack,16,I32);	446	New(54,PL_scopestack,32,I32);
464	PL_scopestack_ix = 0;	447	PL_scopestack_ix = 0;
465	PL_scopestack_max = 16;	448	PL_scopestack_max = 32;
466		449
467	New(54,PL_savestack,96,ANY);	450	New(54,PL_savestack,64,ANY);
468	PL_savestack_ix = 0;	451	PL_savestack_ix = 0;
469	PL_savestack_max = 96;	452	PL_savestack_max = 64;
470		453
471	#if PERL_VERSION < 9	454	#if !PERL_VERSION_ATLEAST (5,9,0)
472	New(54,PL_retstack,8,OP*);	455	New(54,PL_retstack,16,OP*);
473	PL_retstack_ix = 0;	456	PL_retstack_ix = 0;
474	PL_retstack_max = 8;	457	PL_retstack_max = 16;
475	#endif	458	#endif
476	}	459	}
		460	#endif
477		461
478	/*	462	/*
479	* destroy the stacks, the callchain etc...	463	* destroy the stacks, the callchain etc...
480	*/	464	*/
481	static void	465	static void
482	destroy_stacks()	466	coro_destroy_stacks ()
483	{	467	{
484	if (!IN_DESTRUCT)	468	if (!IN_DESTRUCT)
485	{	469	{
486	/* is this ugly, I ask? */	470	/* restore all saved variables and stuff */
487	LEAVE_SCOPE (0);	471	LEAVE_SCOPE (0);
		472	assert (PL_tmps_floor == -1);
488		473
489	/* sure it is, but more important: is it correct?? :/ */	474	/* free all temporaries */
490	FREETMPS;	475	FREETMPS;
		476	assert (PL_tmps_ix == -1);
491		477
		478	/* unwind all extra stacks */
492	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/	479	POPSTACK_TO (PL_mainstack);
		480
		481	/* unwind main stack */
		482	dounwind (-1);
493	}	483	}
494		484
495	while (PL_curstackinfo->si_next)	485	while (PL_curstackinfo->si_next)
496	PL_curstackinfo = PL_curstackinfo->si_next;	486	PL_curstackinfo = PL_curstackinfo->si_next;
497		487
498	while (PL_curstackinfo)	488	while (PL_curstackinfo)
499	{	489	{
500	PERL_SI *p = PL_curstackinfo->si_prev;	490	PERL_SI *p = PL_curstackinfo->si_prev;
501		491
502	{ /*D*//*remove*/
503	dSP;
504	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
505	PUTBACK; /* possibly superfluous */
506	}
507
508	if (!IN_DESTRUCT)	492	if (!IN_DESTRUCT)
509	{
510	dounwind (-1);/*D*//*remove*/
511	SvREFCNT_dec (PL_curstackinfo->si_stack);	493	SvREFCNT_dec (PL_curstackinfo->si_stack);
512	}
513		494
514	Safefree (PL_curstackinfo->si_cxstack);	495	Safefree (PL_curstackinfo->si_cxstack);
515	Safefree (PL_curstackinfo);	496	Safefree (PL_curstackinfo);
516	PL_curstackinfo = p;	497	PL_curstackinfo = p;
517	}	498	}
518		499
519	Safefree (PL_tmps_stack);	500	Safefree (PL_tmps_stack);
520	Safefree (PL_markstack);	501	Safefree (PL_markstack);
521	Safefree (PL_scopestack);	502	Safefree (PL_scopestack);
522	Safefree (PL_savestack);	503	Safefree (PL_savestack);
523	#if PERL_VERSION < 9	504	#if !PERL_VERSION_ATLEAST (5,9,0)
524	Safefree (PL_retstack);	505	Safefree (PL_retstack);
525	#endif	506	#endif
526	}	507	}
527		508
528	static void	509	static void
529	setup_coro (struct coro *coro)	510	setup_coro (struct coro *coro)
530	{	511	{
531	/*	512	/*
532	* emulate part of the perl startup here.	513	* emulate part of the perl startup here.
533	*/	514	*/
534	dTHX;	515
		516	coro_init_stacks ();
		517
		518	PL_curcop = &PL_compiling;
		519	PL_in_eval = EVAL_NULL;
		520	PL_curpm = 0;
		521	PL_localizing = 0;
		522	PL_dirty = 0;
		523	PL_restartop = 0;
		524
		525	{
		526	dSP;
		527	LOGOP myop;
		528
		529	SvREFCNT_dec (GvAV (PL_defgv));
		530	GvAV (PL_defgv) = coro->args; coro->args = 0;
		531
		532	Zero (&myop, 1, LOGOP);
		533	myop.op_next = Nullop;
		534	myop.op_flags = OPf_WANT_VOID;
		535
		536	PUSHMARK (SP);
		537	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		538	PUTBACK;
		539	PL_op = (OP *)&myop;
		540	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		541	SPAGAIN;
		542	}
		543
		544	ENTER; /* necessary e.g. for dounwind */
		545	}
		546
		547	static void
		548	free_coro_mortal ()
		549	{
		550	if (coro_mortal)
		551	{
		552	SvREFCNT_dec (coro_mortal);
		553	coro_mortal = 0;
		554	}
		555	}
		556
		557	/* inject a fake call to Coro::State::_cctx_init into the execution */
		558	static void NOINLINE
		559	prepare_cctx (coro_cctx *cctx)
		560	{
535	dSP;	561	dSP;
536	UNOP myop;	562	LOGOP myop;
537	SV *sub_init = (SV *)get_cv ("Coro::State::coro_init", FALSE);
538		563
539	coro_init_stacks ();
540	/*PL_curcop = 0;*/
541	/*PL_in_eval = PL_in_eval;*/ /* inherit */
542	SvREFCNT_dec (GvAV (PL_defgv));
543	GvAV (PL_defgv) = coro->args; coro->args = 0;
544
545	SPAGAIN;
546
547	Zero (&myop, 1, UNOP);	564	Zero (&myop, 1, LOGOP);
548	myop.op_next = Nullop;	565	myop.op_next = PL_op;
549	myop.op_flags = OPf_WANT_VOID;	566	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
550		567
		568	PUSHMARK (SP);
		569	EXTEND (SP, 2);
		570	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		571	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		572	PUTBACK;
551	PL_op = (OP *)&myop;	573	PL_op = (OP *)&myop;
552
553	PUSHMARK(SP);
554	XPUSHs (sub_init);
555	PUTBACK;
556	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	574	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
557	SPAGAIN;	575	SPAGAIN;
558
559	ENTER; /* necessary e.g. for dounwind */
560	}
561
562	static void
563	free_coro_mortal ()
564	{
565	if (coro_mortal)
566	{
567	SvREFCNT_dec (coro_mortal);
568	coro_mortal = 0;
569	}
570	}
571
572	static void
573	prepare_cctx (coro_stack *cctx)
574	{
575	dSP;
576	UNOP myop;
577
578	Zero (&myop, 1, UNOP);
579	myop.op_next = PL_op;
580	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
581
582	PUSHMARK(SP);
583	EXTEND (SP, 2);
584	PUSHs (newSViv (PTR2IV (cctx)));
585	PUSHs ((SV *)get_cv ("Coro::State::cctx_init", FALSE));
586	PUTBACK;
587	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
588	SPAGAIN;
589	}	576	}
590		577
591	static void	578	static void
592	coro_run (void *arg)	579	coro_run (void *arg)
593	{	580	{
		581	/* coro_run is the alternative tail of transfer(), so unlock here. */
		582	UNLOCK;
		583
594	/*	584	/*
595	* this is a _very_ stripped down perl interpreter ;)	585	* this is a _very_ stripped down perl interpreter ;)
596	*/	586	*/
597	UNLOCK;
598
599	PL_top_env = &PL_start_env;	587	PL_top_env = &PL_start_env;
		588
		589	/* inject call to cctx_init */
600	prepare_cctx ((coro_stack *)arg);	590	prepare_cctx ((coro_cctx *)arg);
601		591
602	/* somebody will hit me for both perl_run and PL_restartop */	592	/* somebody will hit me for both perl_run and PL_restartop */
603	perl_run (PERL_GET_CONTEXT);	593	PL_restartop = PL_op;
		594	perl_run (PL_curinterp);
604		595
605	fputs ("FATAL: C coroutine fell over the edge of the world, aborting.\n", stderr);	596	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
606	abort ();	597	abort ();
607	}	598	}
608		599
609	static coro_stack *	600	static coro_cctx *
610	stack_new ()	601	cctx_new ()
611	{	602	{
612	coro_stack *stack;	603	coro_cctx *cctx;
613		604
		605	++cctx_count;
		606
614	New (0, stack, 1, coro_stack);	607	Newz (0, cctx, 1, coro_cctx);
615		608
616	#if HAVE_MMAP	609	#if HAVE_MMAP
617		610
618	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;	611	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
619	/* mmap suppsedly does allocate-on-write for us */	612	/* mmap supposedly does allocate-on-write for us */
620	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);	613	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
621		614
622	if (stack->sptr == (void *)-1)	615	if (cctx->sptr == (void *)-1)
623	{	616	{
624	perror ("FATAL: unable to mmap stack for coroutine");	617	perror ("FATAL: unable to mmap stack for coroutine");
625	_exit (EXIT_FAILURE);	618	_exit (EXIT_FAILURE);
626	}	619	}
627		620
628	# if STACKGUARD	621	# if STACKGUARD
629	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);	622	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
630	# endif	623	# endif
631		624
632	#else	625	#else
633		626
634	stack->ssize = STACKSIZE * (long)sizeof (long);	627	cctx->ssize = STACKSIZE * (long)sizeof (long);
635	New (0, stack->sptr, STACKSIZE, long);	628	New (0, cctx->sptr, STACKSIZE, long);
636		629
637	if (!stack->sptr)	630	if (!cctx->sptr)
638	{	631	{
639	perror (stderr, "FATAL: unable to malloc stack for coroutine");	632	perror ("FATAL: unable to malloc stack for coroutine");
640	_exit (EXIT_FAILURE);	633	_exit (EXIT_FAILURE);
641	}	634	}
642		635
643	#endif	636	#endif
644		637
		638	#if USE_VALGRIND
		639	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		640	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		641	cctx->ssize + (char *)cctx->sptr
		642	);
		643	#endif
		644
645	coro_create (&stack->cctx, coro_run, (void *)stack, stack->sptr, stack->ssize);	645	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
646		646
647	return stack;	647	return cctx;
648	}	648	}
649		649
650	static void	650	static void
651	stack_free (coro_stack *stack)	651	cctx_destroy (coro_cctx *cctx)
652	{	652	{
653	if (!stack)	653	if (!cctx)
654	return;	654	return;
655		655
		656	--cctx_count;
		657
		658	#if USE_VALGRIND
		659	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		660	#endif
		661
656	#if HAVE_MMAP	662	#if HAVE_MMAP
657	munmap (stack->sptr, stack->ssize);	663	munmap (cctx->sptr, cctx->ssize);
658	#else	664	#else
659	Safefree (stack->sptr);	665	Safefree (cctx->sptr);
660	#endif	666	#endif
661		667
662	Safefree (stack);	668	Safefree (cctx);
663	}	669	}
664		670
665	static coro_stack *stack_first;
666
667	static coro_stack *	671	static coro_cctx *
668	stack_get ()	672	cctx_get ()
669	{	673	{
670	coro_stack *stack;	674	coro_cctx *cctx;
671		675
672	if (stack_first)	676	if (cctx_first)
673	{	677	{
674	stack = stack_first;	678	cctx = cctx_first;
675	stack_first = stack->next;	679	cctx_first = cctx->next;
		680	--cctx_idle;
676	}	681	}
677	else	682	else
678	{	683	{
679	stack = stack_new ();	684	cctx = cctx_new ();
680	PL_op = PL_op->op_next;	685	PL_op = PL_op->op_next;
681	}	686	}
682		687
683	return stack;	688	return cctx;
684	}	689	}
685		690
686	static void	691	static void
687	stack_put (coro_stack *stack)	692	cctx_put (coro_cctx *cctx)
688	{	693	{
689	stack->next = stack_first;	694	/* free another cctx if overlimit */
690	stack_first = stack;	695	if (cctx_idle >= MAX_IDLE_CCTX)
		696	{
		697	coro_cctx *first = cctx_first;
		698	cctx_first = first->next;
		699	--cctx_idle;
		700
		701	assert (!first->inuse);
		702	cctx_destroy (first);
		703	}
		704
		705	++cctx_idle;
		706	cctx->next = cctx_first;
		707	cctx_first = cctx;
691	}	708	}
692		709
693	/* never call directly, always through the coro_state_transfer global variable */	710	/* never call directly, always through the coro_state_transfer global variable */
694	static void	711	static void NOINLINE
695	transfer_impl (struct coro *prev, struct coro *next, int flags)	712	transfer (struct coro *prev, struct coro *next)
696	{	713	{
697	dSTACKLEVEL;	714	dSTACKLEVEL;
698		715
699	/* sometimes transfer is only called to set idle_sp */	716	/* sometimes transfer is only called to set idle_sp */
700	if (flags == TRANSFER_SET_STACKLEVEL)	717	if (!next)
		718	{
701	((coro_stack *)prev)->idle_sp = STACKLEVEL;	719	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		720	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
		721	}
702	else if (prev != next)	722	else if (prev != next)
703	{	723	{
704	coro_stack *prev__stack;	724	coro_cctx *prev__cctx;
		725
		726	if (prev->flags & CF_NEW)
		727	{
		728	/* create a new empty context */
		729	Newz (0, prev->cctx, 1, coro_cctx);
		730	prev->cctx->inuse = 1;
		731	prev->flags &= ~CF_NEW;
		732	prev->flags |= CF_RUNNING;
		733	}
		734
		735	/*TODO: must not croak here */
		736	if (!prev->flags & CF_RUNNING)
		737	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		738
		739	if (next->flags & CF_RUNNING)
		740	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		741
		742	if (next->flags & CF_DESTROYED)
		743	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		744
		745	prev->flags &= ~CF_RUNNING;
		746	next->flags |= CF_RUNNING;
705		747
706	LOCK;	748	LOCK;
707		749
708	if (next->mainstack)	750	if (next->flags & CF_NEW)
709	{	751	{
710	/* coroutine already started */	752	/* need to start coroutine */
711	SAVE (prev, flags);	753	next->flags &= ~CF_NEW;
712	LOAD (next);	754	/* first get rid of the old state */
		755	save_perl (prev);
		756	/* setup coroutine call */
		757	setup_coro (next);
		758	/* need a new stack */
		759	assert (!next->cctx);
713	}	760	}
714	else	761	else
715	{	762	{
716	/* need to start coroutine */	763	/* coroutine already started */
717	/* first get rid of the old state */	764	save_perl (prev);
718	SAVE (prev, -1);	765	load_perl (next);
719	/* setup coroutine call */
720	setup_coro (next);
721	/* need a stack */
722	next->stack = 0;
723	}	766	}
724		767
725	if (!prev->stack)
726	/* create a new empty context */
727	Newz (0, prev->stack, 1, coro_stack);
728
729	prev__stack = prev->stack;	768	prev__cctx = prev->cctx;
730		769
731	/* possibly "free" the stack */	770	/* possibly "free" the cctx */
732	if (prev__stack->idle_sp == STACKLEVEL)	771	if (prev__cctx->idle_sp == STACKLEVEL)
733	{	772	{
734	stack_put (prev__stack);	773	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		774	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		775
735	prev->stack = 0;	776	prev->cctx = 0;
		777
		778	cctx_put (prev__cctx);
		779	prev__cctx->inuse = 0;
736	}	780	}
737		781
738	if (!next->stack)	782	if (!next->cctx)
739	next->stack = stack_get ();
740
741	if (prev__stack != next->stack)
742	{	783	{
743	prev__stack->top_env = PL_top_env;	784	next->cctx = cctx_get ();
744	PL_top_env = next->stack->top_env;	785	assert (!next->cctx->inuse);
745	coro_transfer (&prev__stack->cctx, &next->stack->cctx);	786	next->cctx->inuse = 1;
746	}	787	}
747		788
		789	if (prev__cctx != next->cctx)
		790	{
		791	prev__cctx->top_env = PL_top_env;
		792	PL_top_env = next->cctx->top_env;
		793	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		794	}
		795
748	free_coro_mortal ();	796	free_coro_mortal ();
749
750	UNLOCK;	797	UNLOCK;
751	}	798	}
752	}	799	}
753		800
754	/* use this function pointer to call the above function */
755	/* this is done to increase chances of the compiler not inlining the call */
756	/* not static to make it even harder for the compiler (and theoretically impossible in most cases */
757	void (*coro_state_transfer)(struct coro *prev, struct coro *next, int flags) = transfer_impl;
758
759	struct transfer_args	801	struct transfer_args
760	{	802	{
761	struct coro *prev, *next;	803	struct coro *prev, *next;
762	int flags;
763	};	804	};
764		805
765	#define TRANSFER(ta) coro_state_transfer ((ta).prev, (ta).next, (ta).flags)	806	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
766		807
767	static void	808	static int
768	coro_state_destroy (struct coro *coro)	809	coro_state_destroy (struct coro *coro)
769	{	810	{
770	if (coro->refcnt--)	811	if (coro->flags & CF_DESTROYED)
771	return;	812	return 0;
		813
		814	coro->flags |= CF_DESTROYED;
772		815
773	if (coro->mainstack && coro->mainstack != main_mainstack)	816	if (coro->mainstack && coro->mainstack != main_mainstack)
774	{	817	{
		818	assert (!(coro->flags & CF_RUNNING));
		819
775	struct coro temp;	820	struct coro temp;
		821	Zero (&temp, 1, struct coro);
		822	temp.save = CORO_SAVE_ALL;
776		823
777	SAVE ((&temp), TRANSFER_SAVE_ALL);	824	if (coro->flags & CF_RUNNING)
778	LOAD (coro);	825	croak ("FATAL: tried to destroy currently running coroutine");
779		826
		827	save_perl (&temp);
		828	load_perl (coro);
		829
780	destroy_stacks ();	830	coro_destroy_stacks ();
781		831
782	LOAD ((&temp)); /* this will get rid of defsv etc.. */	832	load_perl (&temp); /* this will get rid of defsv etc.. */
783		833
784	coro->mainstack = 0;	834	coro->mainstack = 0;
785	}	835	}
786		836
787	stack_free (coro->stack);	837	cctx_destroy (coro->cctx);
788	SvREFCNT_dec (coro->args);	838	SvREFCNT_dec (coro->args);
789	Safefree (coro);	839
		840	return 1;
790	}	841	}
791		842
792	static int	843	static int
793	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)	844	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
794	{	845	{
795	struct coro *coro = (struct coro *)mg->mg_ptr;	846	struct coro *coro = (struct coro *)mg->mg_ptr;
796	mg->mg_ptr = 0;	847	mg->mg_ptr = 0;
797		848
		849	if (--coro->refcnt < 0)
		850	{
798	coro_state_destroy (coro);	851	coro_state_destroy (coro);
		852	Safefree (coro);
		853	}
799		854
800	return 0;	855	return 0;
801	}	856	}
802		857
803	static int	858	static int
…		…
808	++coro->refcnt;	863	++coro->refcnt;
809		864
810	return 0;	865	return 0;
811	}	866	}
812		867
813	static MGVTBL coro_state_vtbl = { 0, 0, 0, 0, coro_state_clear, 0, coro_state_dup, 0 };	868	static MGVTBL coro_state_vtbl = {
		869	0, 0, 0, 0,
		870	coro_state_free,
		871	0,
		872	#ifdef MGf_DUP
		873	coro_state_dup,
		874	#else
		875	# define MGf_DUP 0
		876	#endif
		877	};
814		878
815	static struct coro *	879	static struct coro *
816	SvSTATE (SV *coro)	880	SvSTATE (SV *coro)
817	{	881	{
818	HV *stash;	882	HV *stash;
…		…
833	assert (mg->mg_type == PERL_MAGIC_ext);	897	assert (mg->mg_type == PERL_MAGIC_ext);
834	return (struct coro *)mg->mg_ptr;	898	return (struct coro *)mg->mg_ptr;
835	}	899	}
836		900
837	static void	901	static void
838	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)	902	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
839	{	903	{
840	ta->prev = SvSTATE (prev);	904	ta->prev = SvSTATE (prev_sv);
841	ta->next = SvSTATE (next);	905	ta->next = SvSTATE (next_sv);
842	ta->flags = flags;
843	}	906	}
844		907
845	static void	908	static void
846	api_transfer (SV *prev, SV *next, int flags)	909	api_transfer (SV *prev_sv, SV *next_sv)
847	{	910	{
848	dTHX;
849	struct transfer_args ta;	911	struct transfer_args ta;
850		912
851	prepare_transfer (&ta, prev, next, flags);	913	prepare_transfer (&ta, prev_sv, next_sv);
852	TRANSFER (ta);	914	TRANSFER (ta);
		915	}
		916
		917	static int
		918	api_save (SV *coro_sv, int new_save)
		919	{
		920	struct coro *coro = SvSTATE (coro_sv);
		921	int old_save = coro->save;
		922
		923	if (new_save >= 0)
		924	coro->save = new_save;
		925
		926	return old_save;
853	}	927	}
854		928
855	/** Coro ********************************************************************/	929	/** Coro ********************************************************************/
856		930
857	#define PRIO_MAX 3	931	#define PRIO_MAX 3
…		…
860	#define PRIO_LOW -1	934	#define PRIO_LOW -1
861	#define PRIO_IDLE -3	935	#define PRIO_IDLE -3
862	#define PRIO_MIN -4	936	#define PRIO_MIN -4
863		937
864	/* for Coro.pm */	938	/* for Coro.pm */
865	static GV *coro_current, *coro_idle;	939	static SV *coro_current;
866	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];	940	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
867	static int coro_nready;	941	static int coro_nready;
868		942
869	static void	943	static void
870	coro_enq (SV *sv)	944	coro_enq (SV *coro_sv)
871	{	945	{
872	int prio;
873
874	if (SvTYPE (sv) != SVt_PVHV)
875	croak ("Coro::ready tried to enqueue something that is not a coroutine");
876
877	prio = SvSTATE (sv)->prio;
878
879	av_push (coro_ready [prio - PRIO_MIN], sv);	946	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
880	coro_nready++;	947	coro_nready++;
881	}	948	}
882		949
883	static SV *	950	static SV *
884	coro_deq (int min_prio)	951	coro_deq (int min_prio)
…		…
897	}	964	}
898		965
899	return 0;	966	return 0;
900	}	967	}
901		968
902	static void	969	static int
903	api_ready (SV *coro)	970	api_ready (SV *coro_sv)
904	{	971	{
905	dTHX;	972	struct coro *coro;
906		973
907	if (SvROK (coro))	974	if (SvROK (coro_sv))
908	coro = SvRV (coro);	975	coro_sv = SvRV (coro_sv);
		976
		977	coro = SvSTATE (coro_sv);
		978
		979	if (coro->flags & CF_READY)
		980	return 0;
		981
		982	coro->flags |= CF_READY;
909		983
910	LOCK;	984	LOCK;
911	coro_enq (SvREFCNT_inc (coro));	985	coro_enq (SvREFCNT_inc (coro_sv));
912	UNLOCK;	986	UNLOCK;
		987
		988	return 1;
		989	}
		990
		991	static int
		992	api_is_ready (SV *coro_sv)
		993	{
		994	return !!(SvSTATE (coro_sv)->flags & CF_READY);
913	}	995	}
914		996
915	static void	997	static void
916	prepare_schedule (struct transfer_args *ta)	998	prepare_schedule (struct transfer_args *ta)
917	{	999	{
918	SV *current, *prev, *next;	1000	SV *prev_sv, *next_sv;
919
920	current = GvSV (coro_current);
921		1001
922	for (;;)	1002	for (;;)
923	{	1003	{
924	LOCK;	1004	LOCK;
925	next = coro_deq (PRIO_MIN);	1005	next_sv = coro_deq (PRIO_MIN);
926	UNLOCK;	1006	UNLOCK;
927		1007
		1008	/* nothing to schedule: call the idle handler */
928	if (next)	1009	if (!next_sv)
929	break;
930
931	{	1010	{
932	dSP;	1011	dSP;
933		1012
934	ENTER;	1013	ENTER;
935	SAVETMPS;	1014	SAVETMPS;
936		1015
937	PUSHMARK (SP);	1016	PUSHMARK (SP);
938	PUTBACK;	1017	PUTBACK;
939	call_sv (GvSV (coro_idle), G_DISCARD);	1018	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
940		1019
941	FREETMPS;	1020	FREETMPS;
942	LEAVE;	1021	LEAVE;
		1022	continue;
943	}	1023	}
944	}
945		1024
946	prev = SvRV (current);	1025	ta->next = SvSTATE (next_sv);
947	SvRV (current) = next;	1026
		1027	/* cannot transfer to destroyed coros, skip and look for next */
		1028	if (ta->next->flags & CF_DESTROYED)
		1029	{
		1030	SvREFCNT_dec (next_sv);
		1031	continue;
		1032	}
		1033
		1034	break;
		1035	}
948		1036
949	/* free this only after the transfer */	1037	/* free this only after the transfer */
		1038	prev_sv = SvRV (coro_current);
		1039	SvRV_set (coro_current, next_sv);
		1040	ta->prev = SvSTATE (prev_sv);
		1041
		1042	assert (ta->next->flags & CF_READY);
		1043	ta->next->flags &= ~CF_READY;
		1044
950	LOCK;	1045	LOCK;
951	free_coro_mortal ();	1046	free_coro_mortal ();
		1047	coro_mortal = prev_sv;
952	UNLOCK;	1048	UNLOCK;
953	coro_mortal = prev;
954
955	ta->prev = SvSTATE (prev);
956	ta->next = SvSTATE (next);
957	ta->flags = TRANSFER_SAVE_ALL;
958	}	1049	}
959		1050
960	static void	1051	static void
961	prepare_cede (struct transfer_args *ta)	1052	prepare_cede (struct transfer_args *ta)
962	{	1053	{
963	LOCK;	1054	api_ready (coro_current);
964	coro_enq (SvREFCNT_inc (SvRV (GvSV (coro_current))));
965	UNLOCK;
966
967	prepare_schedule (ta);	1055	prepare_schedule (ta);
968	}	1056	}
969		1057
		1058	static int
		1059	prepare_cede_notself (struct transfer_args *ta)
		1060	{
		1061	if (coro_nready)
		1062	{
		1063	SV *prev = SvRV (coro_current);
		1064	prepare_schedule (ta);
		1065	api_ready (prev);
		1066	return 1;
		1067	}
		1068	else
		1069	return 0;
		1070	}
		1071
970	static void	1072	static void
971	api_schedule (void)	1073	api_schedule (void)
972	{	1074	{
973	dTHX;
974	struct transfer_args ta;	1075	struct transfer_args ta;
975		1076
976	prepare_schedule (&ta);	1077	prepare_schedule (&ta);
977	TRANSFER (ta);	1078	TRANSFER (ta);
978	}	1079	}
979		1080
980	static void	1081	static int
981	api_cede (void)	1082	api_cede (void)
982	{	1083	{
983	dTHX;
984	struct transfer_args ta;	1084	struct transfer_args ta;
985		1085
986	prepare_cede (&ta);	1086	prepare_cede (&ta);
		1087
		1088	if (ta.prev != ta.next)
		1089	{
987	TRANSFER (ta);	1090	TRANSFER (ta);
		1091	return 1;
		1092	}
		1093	else
		1094	return 0;
		1095	}
		1096
		1097	static int
		1098	api_cede_notself (void)
		1099	{
		1100	struct transfer_args ta;
		1101
		1102	if (prepare_cede_notself (&ta))
		1103	{
		1104	TRANSFER (ta);
		1105	return 1;
		1106	}
		1107	else
		1108	return 0;
988	}	1109	}
989		1110
990	MODULE = Coro::State PACKAGE = Coro::State	1111	MODULE = Coro::State PACKAGE = Coro::State
991		1112
992	PROTOTYPES: DISABLE	1113	PROTOTYPES: DISABLE
…		…
998	#endif	1119	#endif
999	BOOT_PAGESIZE;	1120	BOOT_PAGESIZE;
1000		1121
1001	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1122	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
1002		1123
1003	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1124	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
1004	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1125	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
1005	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1126	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1127	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
		1128	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
1006		1129
1007	main_mainstack = PL_mainstack;	1130	main_mainstack = PL_mainstack;
1008		1131
1009	coroapi.ver = CORO_API_VERSION;	1132	coroapi.ver = CORO_API_VERSION;
1010	coroapi.transfer = api_transfer;	1133	coroapi.transfer = api_transfer;
…		…
1020	HV *hv;	1143	HV *hv;
1021	int i;	1144	int i;
1022		1145
1023	Newz (0, coro, 1, struct coro);	1146	Newz (0, coro, 1, struct coro);
1024	coro->args = newAV ();	1147	coro->args = newAV ();
		1148	coro->save = CORO_SAVE_ALL;
		1149	coro->flags = CF_NEW;
1025		1150
1026	hv = newHV ();	1151	hv = newHV ();
1027	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;	1152	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
1028	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));	1153	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
1029		1154
1030	for (i = 1; i < items; i++)	1155	for (i = 1; i < items; i++)
1031	av_push (coro->args, newSVsv (ST (i)));	1156	av_push (coro->args, newSVsv (ST (i)));
1032
1033	/*coro->mainstack = 0; *//*actual work is done inside transfer */
1034	/*coro->stack = 0;*/
1035	}	1157	}
1036	OUTPUT:	1158	OUTPUT:
		1159	RETVAL
		1160
		1161	int
		1162	save (SV *coro, int new_save = -1)
		1163	CODE:
		1164	RETVAL = api_save (coro, new_save);
		1165	OUTPUT:
1037	RETVAL	1166	RETVAL
1038		1167
1039	void	1168	void
1040	_set_stacklevel (...)	1169	_set_stacklevel (...)
1041	ALIAS:	1170	ALIAS:
1042	Coro::State::transfer = 1	1171	Coro::State::transfer = 1
1043	Coro::schedule = 2	1172	Coro::schedule = 2
1044	Coro::cede = 3	1173	Coro::cede = 3
1045	Coro::Cont::yield = 4	1174	Coro::cede_notself = 4
1046	CODE:	1175	CODE:
1047	{	1176	{
1048	struct transfer_args ta;	1177	struct transfer_args ta;
1049		1178
1050	switch (ix)	1179	switch (ix)
1051	{	1180	{
1052	case 0:	1181	case 0:
1053	ta.prev = (struct coro *)INT2PTR (coro_stack *, SvIV (ST (0)));	1182	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
1054	ta.next = 0;	1183	ta.next = 0;
1055	ta.flags = TRANSFER_SET_STACKLEVEL;
1056	break;	1184	break;
1057		1185
1058	case 1:	1186	case 1:
1059	if (items != 3)	1187	if (items != 2)
1060	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);	1188	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
1061		1189
1062	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));	1190	prepare_transfer (&ta, ST (0), ST (1));
1063	break;	1191	break;
1064		1192
1065	case 2:	1193	case 2:
1066	prepare_schedule (&ta);	1194	prepare_schedule (&ta);
1067	break;	1195	break;
…		…
1069	case 3:	1197	case 3:
1070	prepare_cede (&ta);	1198	prepare_cede (&ta);
1071	break;	1199	break;
1072		1200
1073	case 4:	1201	case 4:
1074	{	1202	if (!prepare_cede_notself (&ta))
1075	SV *yieldstack;	1203	XSRETURN_EMPTY;
1076	SV *sv;
1077	AV *defav = GvAV (PL_defgv);
1078		1204
1079	yieldstack = *hv_fetch (
1080	(HV *)SvRV (GvSV (coro_current)),
1081	"yieldstack", sizeof ("yieldstack") - 1,
1082	0
1083	);
1084
1085	/* set up @_ -- ugly */
1086	av_clear (defav);
1087	av_fill (defav, items - 1);
1088	while (items--)
1089	av_store (defav, items, SvREFCNT_inc (ST(items)));
1090
1091	sv = av_pop ((AV *)SvRV (yieldstack));
1092	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
1093	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
1094	ta.flags = 0;
1095	SvREFCNT_dec (sv);
1096	}
1097	break;	1205	break;
1098
1099	}	1206	}
1100		1207
		1208	BARRIER;
1101	TRANSFER (ta);	1209	TRANSFER (ta);
1102	}
1103		1210
1104	void	1211	if (GIMME_V != G_VOID && ta.next != ta.prev)
1105	_clone_state_from (SV *dst, SV *src)	1212	XSRETURN_YES;
		1213	}
		1214
		1215	bool
		1216	_destroy (SV *coro_sv)
1106	CODE:	1217	CODE:
1107	{	1218	RETVAL = coro_state_destroy (SvSTATE (coro_sv));
1108	struct coro *coro_src = SvSTATE (src);	1219	OUTPUT:
1109		1220	RETVAL
1110	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
1111
1112	++coro_src->refcnt;
1113	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
1114	}
1115
1116	void
1117	_nonlocal_goto (IV nextop)
1118	CODE:
1119	/* uuh, somebody will kill me again for this */
1120	PL_op->op_next = INT2PTR (OP *, nextop);
1121		1221
1122	void	1222	void
1123	_exit (code)	1223	_exit (code)
1124	int code	1224	int code
1125	PROTOTYPE: $	1225	PROTOTYPE: $
1126	CODE:	1226	CODE:
1127	_exit (code);	1227	_exit (code);
1128		1228
		1229	int
		1230	cctx_count ()
		1231	CODE:
		1232	RETVAL = cctx_count;
		1233	OUTPUT:
		1234	RETVAL
		1235
		1236	int
		1237	cctx_idle ()
		1238	CODE:
		1239	RETVAL = cctx_idle;
		1240	OUTPUT:
		1241	RETVAL
		1242
1129	MODULE = Coro::State PACKAGE = Coro	1243	MODULE = Coro::State PACKAGE = Coro
1130		1244
1131	BOOT:	1245	BOOT:
1132	{	1246	{
1133	int i;	1247	int i;
…		…
1139	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1253	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1140	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));	1254	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1141	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1255	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1142	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));	1256	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1143		1257
1144	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1258	coro_current = get_sv ("Coro::current", FALSE);
1145	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1259	SvREADONLY_on (coro_current);
1146		1260
1147	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1261	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1148	coro_ready[i] = newAV ();	1262	coro_ready[i] = newAV ();
1149		1263
1150	{	1264	{
1151	SV *sv = perl_get_sv("Coro::API", 1);	1265	SV *sv = perl_get_sv("Coro::API", 1);
1152		1266
1153	coroapi.schedule = api_schedule;	1267	coroapi.schedule = api_schedule;
		1268	coroapi.save = api_save;
1154	coroapi.cede = api_cede;	1269	coroapi.cede = api_cede;
		1270	coroapi.cede_notself = api_cede_notself;
1155	coroapi.ready = api_ready;	1271	coroapi.ready = api_ready;
		1272	coroapi.is_ready = api_is_ready;
1156	coroapi.nready = &coro_nready;	1273	coroapi.nready = &coro_nready;
1157	coroapi.current = coro_current;	1274	coroapi.current = coro_current;
1158		1275
1159	GCoroAPI = &coroapi;	1276	GCoroAPI = &coroapi;
1160	sv_setiv (sv, (IV)&coroapi);	1277	sv_setiv (sv, (IV)&coroapi);
1161	SvREADONLY_on (sv);	1278	SvREADONLY_on (sv);
1162	}	1279	}
1163	}	1280	}
		1281
		1282	void
		1283	_set_current (SV *current)
		1284	PROTOTYPE: $
		1285	CODE:
		1286	SvREFCNT_dec (SvRV (coro_current));
		1287	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1164		1288
1165	int	1289	int
1166	prio (Coro::State coro, int newprio = 0)	1290	prio (Coro::State coro, int newprio = 0)
1167	ALIAS:	1291	ALIAS:
1168	nice = 1	1292	nice = 1
…		…
1171	RETVAL = coro->prio;	1295	RETVAL = coro->prio;
1172		1296
1173	if (items > 1)	1297	if (items > 1)
1174	{	1298	{
1175	if (ix)	1299	if (ix)
1176	newprio += coro->prio;	1300	newprio = coro->prio - newprio;
1177		1301
1178	if (newprio < PRIO_MIN) newprio = PRIO_MIN;	1302	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
1179	if (newprio > PRIO_MAX) newprio = PRIO_MAX;	1303	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
1180		1304
1181	coro->prio = newprio;	1305	coro->prio = newprio;
1182	}	1306	}
1183	}	1307	}
		1308	OUTPUT:
		1309	RETVAL
1184		1310
1185	void	1311	SV *
1186	ready (SV *self)	1312	ready (SV *self)
1187	PROTOTYPE: $	1313	PROTOTYPE: $
1188	CODE:	1314	CODE:
1189	api_ready (self);	1315	RETVAL = boolSV (api_ready (self));
		1316	OUTPUT:
		1317	RETVAL
		1318
		1319	SV *
		1320	is_ready (SV *self)
		1321	PROTOTYPE: $
		1322	CODE:
		1323	RETVAL = boolSV (api_is_ready (self));
		1324	OUTPUT:
		1325	RETVAL
1190		1326
1191	int	1327	int
1192	nready (...)	1328	nready (...)
1193	PROTOTYPE:	1329	PROTOTYPE:
1194	CODE:	1330	CODE:
…		…
1200		1336
1201	SV *	1337	SV *
1202	_get_state ()	1338	_get_state ()
1203	CODE:	1339	CODE:
1204	{	1340	{
1205	struct {	1341	struct io_state *data;
1206	int errorno;
1207	int laststype;
1208	int laststatval;
1209	Stat_t statcache;
1210	} data;
1211		1342
		1343	RETVAL = newSV (sizeof (struct io_state));
		1344	data = (struct io_state *)SvPVX (RETVAL);
		1345	SvCUR_set (RETVAL, sizeof (struct io_state));
		1346	SvPOK_only (RETVAL);
		1347
1212	data.errorno = errno;	1348	data->errorno = errno;
1213	data.laststype = PL_laststype;	1349	data->laststype = PL_laststype;
1214	data.laststatval = PL_laststatval;	1350	data->laststatval = PL_laststatval;
1215	data.statcache = PL_statcache;	1351	data->statcache = PL_statcache;
1216
1217	RETVAL = newSVpvn ((char *)&data, sizeof data);
1218	}	1352	}
1219	OUTPUT:	1353	OUTPUT:
1220	RETVAL	1354	RETVAL
1221		1355
1222	void	1356	void
1223	_set_state (char *data_)	1357	_set_state (char *data_)
1224	PROTOTYPE: $	1358	PROTOTYPE: $
1225	CODE:	1359	CODE:
1226	{	1360	{
1227	struct {	1361	struct io_state *data = (void *)data_;
1228	int errorno;
1229	int laststype;
1230	int laststatval;
1231	Stat_t statcache;
1232	} *data = (void *)data_;
1233		1362
1234	errno = data->errorno;	1363	errno = data->errorno;
1235	PL_laststype = data->laststype;	1364	PL_laststype = data->laststype;
1236	PL_laststatval = data->laststatval;	1365	PL_laststatval = data->laststatval;
1237	PL_statcache = data->statcache;	1366	PL_statcache = data->statcache;
1238	}	1367	}
		1368

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