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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.77 by root, Tue Oct 31 23:55:33 2006 UTC vs.
Revision 1.125 by root, Mon Dec 11 20:54:45 2006 UTC

1	#define PERL_NO_GET_CONTEXT
2
3	#include "libcoro/coro.c"	1	#include "libcoro/coro.c"
4		2
5	#include "EXTERN.h"	3	#include "EXTERN.h"
6	#include "perl.h"	4	#include "perl.h"
7	#include "XSUB.h"	5	#include "XSUB.h"
8		6
9	#include "patchlevel.h"	7	#include "patchlevel.h"
10		8
11	#if PERL_VERSION < 6	9	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	/* the maximum number of idle cctx that will be pooled */
		14	#define MAX_IDLE_CCTX 8
		15
		16	#define PERL_VERSION_ATLEAST(a,b,c) \
		17	(PERL_REVISION > (a) \
		18	|| (PERL_REVISION == (a) \
		19	&& (PERL_VERSION > (b) \
		20	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		21
		22	#if !PERL_VERSION_ATLEAST (5,6,0)
12	# ifndef PL_ppaddr	23	# ifndef PL_ppaddr
13	# define PL_ppaddr ppaddr	24	# define PL_ppaddr ppaddr
14	# endif	25	# endif
15	# ifndef call_sv	26	# ifndef call_sv
16	# define call_sv perl_call_sv	27	# define call_sv perl_call_sv
…		…
27	# ifndef IS_PADCONST	38	# ifndef IS_PADCONST
28	# define IS_PADCONST(v) 0	39	# define IS_PADCONST(v) 0
29	# endif	40	# endif
30	#endif	41	#endif
31		42
		43	/* 5.8.7 */
		44	#ifndef SvRV_set
		45	# define SvRV_set(s,v) SvRV(s) = (v)
		46	#endif
		47
		48	#include <stdio.h>
32	#include <errno.h>	49	#include <errno.h>
		50	#include <assert.h>
		51
		52	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		53	# undef STACKGUARD
		54	#endif
		55
		56	#ifndef STACKGUARD
		57	# define STACKGUARD 0
		58	#endif
33		59
34	#ifdef HAVE_MMAP	60	#ifdef HAVE_MMAP
35	# include <unistd.h>	61	# include <unistd.h>
36	# include <sys/mman.h>	62	# include <sys/mman.h>
37	# ifndef MAP_ANONYMOUS	63	# ifndef MAP_ANONYMOUS
…		…
39	# define MAP_ANONYMOUS MAP_ANON	65	# define MAP_ANONYMOUS MAP_ANON
40	# else	66	# else
41	# undef HAVE_MMAP	67	# undef HAVE_MMAP
42	# endif	68	# endif
43	# endif	69	# endif
		70	# include <limits.h>
		71	# ifndef PAGESIZE
		72	# define PAGESIZE pagesize
		73	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		74	static long pagesize;
		75	# else
		76	# define BOOT_PAGESIZE (void)0
44	#endif	77	# endif
45		78	#else
46	#define SUB_INIT "Coro::State::initialize"	79	# define PAGESIZE 0
47	#define UCORO_STATE "_coro_state"	80	# define BOOT_PAGESIZE (void)0
		81	#endif
48		82
49	/* 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
50	* 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
51	* and should be unique. */	85	* and should be unique. */
		86	#define dSTACKLEVEL int stacklevel
52	#define dSTACKLEVEL void *stacklevel = &stacklevel	87	#define STACKLEVEL ((void *)&stacklevel)
53		88
54	#define IN_DESTRUCT (PL_main_cv == Nullcv)	89	#define IN_DESTRUCT (PL_main_cv == Nullcv)
55		90
56	#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))
57		98
58	#include "CoroAPI.h"	99	#include "CoroAPI.h"
59		100
60	#ifdef USE_ITHREADS	101	#ifdef USE_ITHREADS
61	static perl_mutex coro_mutex;	102	static perl_mutex coro_mutex;
…		…
64	#else	105	#else
65	# define LOCK (void)0	106	# define LOCK (void)0
66	# define UNLOCK (void)0	107	# define UNLOCK (void)0
67	#endif	108	#endif
68		109
		110	struct io_state
		111	{
		112	int errorno;
		113	I32 laststype;
		114	int laststatval;
		115	Stat_t statcache;
		116	};
		117
69	static struct CoroAPI coroapi;	118	static struct CoroAPI coroapi;
70	static AV *main_mainstack; /* used to differentiate between $main and others */	119	static AV *main_mainstack; /* used to differentiate between $main and others */
71	static HV *coro_state_stash;	120	static HV *coro_state_stash, *coro_stash;
72	static SV *ucoro_state_sv;
73	static U32 ucoro_state_hash;
74	static SV *coro_mortal; /* will be freed after next transfer */	121	static SV *coro_mortal; /* will be freed after next transfer */
75		122
76	/* this is actually not only the c stack but also c registers etc... */	123	static struct coro_cctx *cctx_first;
		124	static int cctx_count, cctx_idle;
		125
		126	/* this is a structure representing a c-level coroutine */
77	typedef struct {	127	typedef struct coro_cctx {
78	int refcnt; /* pointer reference counter */	128	struct coro_cctx *next;
79	int usecnt; /* shared by how many coroutines */
80	int gencnt; /* generation counter */
81		129
82	coro_context cctx;	130	/* the stack */
83
84	void *sptr;	131	void *sptr;
85	long ssize; /* positive == mmap, otherwise malloc */	132	long ssize; /* positive == mmap, otherwise malloc */
86	} coro_stack;
87		133
		134	/* cpu state */
		135	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		136	JMPENV *top_env;
		137	coro_context cctx;
		138
		139	int inuse;
		140
		141	#if USE_VALGRIND
		142	int valgrind_id;
		143	#endif
		144	} coro_cctx;
		145
		146	enum {
		147	CF_RUNNING = 0x0001, /* coroutine is running */
		148	CF_READY = 0x0002, /* coroutine is ready */
		149	CF_NEW = 0x0004, /* ahs never been switched to */
		150	};
		151
		152	/* this is a structure representing a perl-level coroutine */
88	struct coro {	153	struct coro {
89	/* the top-level JMPENV for each coroutine, needed to catch dies. */	154	/* the c coroutine allocated to this perl coroutine, if any */
90	JMPENV start_env;	155	coro_cctx *cctx;
91
92	/* the optional C context */
93	coro_stack *stack;
94	void *cursp;
95	int gencnt;
96
97	/* optionally saved, might be zero */
98	AV *defav;
99	SV *defsv;
100	SV *errsv;
101
102	/* saved global state not related to stacks */
103	U8 dowarn;
104	I32 in_eval;
105
106	/* the stacks and related info (callchain etc..) */
107	PERL_SI *curstackinfo;
108	AV *curstack;
109	AV *mainstack;
110	SV **stack_sp;
111	OP *op;
112	SV **curpad;
113	AV *comppad;
114	CV *compcv;
115	SV **stack_base;
116	SV **stack_max;
117	SV **tmps_stack;
118	I32 tmps_floor;
119	I32 tmps_ix;
120	I32 tmps_max;
121	I32 *markstack;
122	I32 *markstack_ptr;
123	I32 *markstack_max;
124	I32 *scopestack;
125	I32 scopestack_ix;
126	I32 scopestack_max;
127	ANY *savestack;
128	I32 savestack_ix;
129	I32 savestack_max;
130	OP **retstack;
131	I32 retstack_ix;
132	I32 retstack_max;
133	PMOP *curpm;
134	COP *curcop;
135	JMPENV *top_env;
136		156
137	/* data associated with this coroutine (initial args) */	157	/* data associated with this coroutine (initial args) */
138	AV *args;	158	AV *args;
		159	int refcnt;
		160	int save; /* CORO_SAVE flags */
		161	int flags; /* CF_ flags */
		162
		163	/* optionally saved, might be zero */
		164	AV *defav; /* @_ */
		165	SV *defsv; /* $_ */
		166	SV *errsv; /* $@ */
		167	SV *irssv; /* $/ */
		168	SV *irssv_sv; /* real $/ cache */
		169
		170	#define VAR(name,type) type name;
		171	# include "state.h"
		172	#undef VAR
		173
		174	/* coro process data */
		175	int prio;
139	};	176	};
140		177
141	typedef struct coro *Coro__State;	178	typedef struct coro *Coro__State;
142	typedef struct coro *Coro__State_or_hashref;	179	typedef struct coro *Coro__State_or_hashref;
143		180
144	static AV *	181	static AV *
145	coro_clone_padlist (pTHX_ CV *cv)	182	coro_clone_padlist (CV *cv)
146	{	183	{
147	AV *padlist = CvPADLIST (cv);	184	AV *padlist = CvPADLIST (cv);
148	AV *newpadlist, *newpad;	185	AV *newpadlist, *newpad;
149		186
150	newpadlist = newAV ();	187	newpadlist = newAV ();
151	AvREAL_off (newpadlist);	188	AvREAL_off (newpadlist);
		189	#if PERL_VERSION_ATLEAST (5,9,0)
		190	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		191	#else
152	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);	192	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		193	#endif
153	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];	194	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
154	--AvFILLp (padlist);	195	--AvFILLp (padlist);
155		196
156	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));	197	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
157	av_store (newpadlist, 1, (SV *)newpad);	198	av_store (newpadlist, 1, (SV *)newpad);
158		199
159	return newpadlist;	200	return newpadlist;
160	}	201	}
161		202
162	static void	203	static void
163	free_padlist (pTHX_ AV *padlist)	204	free_padlist (AV *padlist)
164	{	205	{
165	/* may be during global destruction */	206	/* may be during global destruction */
166	if (SvREFCNT (padlist))	207	if (SvREFCNT (padlist))
167	{	208	{
168	I32 i = AvFILLp (padlist);	209	I32 i = AvFILLp (padlist);
…		…
189	AV *padlist;	230	AV *padlist;
190	AV *av = (AV *)mg->mg_obj;	231	AV *av = (AV *)mg->mg_obj;
191		232
192	/* casting is fun. */	233	/* casting is fun. */
193	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	234	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
194	free_padlist (aTHX_ padlist);	235	free_padlist (padlist);
195		236
196	SvREFCNT_dec (av);	237	SvREFCNT_dec (av);
197		238
198	return 0;	239	return 0;
199	}	240	}
200		241
201	#define PERL_MAGIC_coro PERL_MAGIC_ext	242	#define PERL_MAGIC_coro PERL_MAGIC_ext
202		243
203	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	244	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
204		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
205	/* the next two functions merely cache the padlists */	253	/* the next two functions merely cache the padlists */
206	static void	254	static void
207	get_padlist (pTHX_ CV *cv)	255	get_padlist (CV *cv)
208	{	256	{
209	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	257	MAGIC *mg = CORO_MAGIC (cv);
		258	AV *av;
210		259
211	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	260	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
212	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	261	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
213	else	262	else
214	{	263	{
215	#if 0	264	#if 0
216	/* this should work - but it doesn't :( */	265	/* this is probably cleaner, but also slower? */
217	CV *cp = Perl_cv_clone (aTHX_ cv);	266	CV *cp = Perl_cv_clone (cv);
218	CvPADLIST (cv) = CvPADLIST (cp);	267	CvPADLIST (cv) = CvPADLIST (cp);
219	CvPADLIST (cp) = 0;	268	CvPADLIST (cp) = 0;
220	SvREFCNT_dec (cp);	269	SvREFCNT_dec (cp);
221	#else	270	#else
222	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);	271	CvPADLIST (cv) = coro_clone_padlist (cv);
223	#endif	272	#endif
224	}	273	}
225	}	274	}
226		275
227	static void	276	static void
228	put_padlist (pTHX_ CV *cv)	277	put_padlist (CV *cv)
229	{	278	{
230	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	279	MAGIC *mg = CORO_MAGIC (cv);
		280	AV *av;
231		281
232	if (!mg)	282	if (!mg)
233	{	283	{
234	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	284	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
235	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	285	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
236	mg->mg_virtual = &vtbl_coro;	286	mg->mg_virtual = &vtbl_coro;
237	mg->mg_obj = (SV *)newAV ();	287	mg->mg_obj = (SV *)newAV ();
238	}	288	}
239		289
240	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);
241	}	296	}
242		297
243	#define SB do {	298	#define SB do {
244	#define SE } while (0)	299	#define SE } while (0)
245		300
246	#define LOAD(state) load_state(aTHX_ (state));
247	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
248
249	#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
250		302
251	static void	303	static void
252	load_state(pTHX_ Coro__State c)	304	load_perl (Coro__State c)
253	{	305	{
254	PL_dowarn = c->dowarn;	306	#define VAR(name,type) PL_ ## name = c->name;
255	PL_in_eval = c->in_eval;	307	# include "state.h"
256		308	#undef VAR
257	PL_curstackinfo = c->curstackinfo;
258	PL_curstack = c->curstack;
259	PL_mainstack = c->mainstack;
260	PL_stack_sp = c->stack_sp;
261	PL_op = c->op;
262	PL_curpad = c->curpad;
263	PL_comppad = c->comppad;
264	PL_compcv = c->compcv;
265	PL_stack_base = c->stack_base;
266	PL_stack_max = c->stack_max;
267	PL_tmps_stack = c->tmps_stack;
268	PL_tmps_floor = c->tmps_floor;
269	PL_tmps_ix = c->tmps_ix;
270	PL_tmps_max = c->tmps_max;
271	PL_markstack = c->markstack;
272	PL_markstack_ptr = c->markstack_ptr;
273	PL_markstack_max = c->markstack_max;
274	PL_scopestack = c->scopestack;
275	PL_scopestack_ix = c->scopestack_ix;
276	PL_scopestack_max = c->scopestack_max;
277	PL_savestack = c->savestack;
278	PL_savestack_ix = c->savestack_ix;
279	PL_savestack_max = c->savestack_max;
280	#if PERL_VERSION < 9
281	PL_retstack = c->retstack;
282	PL_retstack_ix = c->retstack_ix;
283	PL_retstack_max = c->retstack_max;
284	#endif
285	PL_curpm = c->curpm;
286	PL_curcop = c->curcop;
287	PL_top_env = c->top_env;
288		309
289	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	310	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
290	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	311	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
291	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	}
292		324
293	{	325	{
294	dSP;	326	dSP;
295	CV *cv;	327	CV *cv;
296		328
297	/* now do the ugly restore mess */	329	/* now do the ugly restore mess */
298	while ((cv = (CV *)POPs))	330	while ((cv = (CV *)POPs))
299	{	331	{
300	AV *padlist = (AV *)POPs;
301
302	if (padlist)
303	{
304	put_padlist (aTHX_ cv); /* mark this padlist as available */	332	put_padlist (cv); /* mark this padlist as available */
305	CvPADLIST(cv) = padlist;	333	CvDEPTH (cv) = PTR2IV (POPs);
306	}	334	CvPADLIST (cv) = (AV *)POPs;
307
308	++CvDEPTH(cv);
309	}	335	}
310		336
311	PUTBACK;	337	PUTBACK;
312	}	338	}
313	}	339	}
314		340
315	static void	341	static void
316	save_state(pTHX_ Coro__State c, int flags)	342	save_perl (Coro__State c)
317	{	343	{
318	{	344	{
319	dSP;	345	dSP;
320	I32 cxix = cxstack_ix;	346	I32 cxix = cxstack_ix;
321	PERL_CONTEXT *ccstk = cxstack;	347	PERL_CONTEXT *ccstk = cxstack;
…		…
332	{	358	{
333	while (cxix >= 0)	359	while (cxix >= 0)
334	{	360	{
335	PERL_CONTEXT *cx = &ccstk[cxix--];	361	PERL_CONTEXT *cx = &ccstk[cxix--];
336		362
337	if (CxTYPE(cx) == CXt_SUB)	363	if (CxTYPE (cx) == CXt_SUB)
338	{	364	{
339	CV *cv = cx->blk_sub.cv;	365	CV *cv = cx->blk_sub.cv;
		366
340	if (CvDEPTH(cv))	367	if (CvDEPTH (cv))
341	{	368	{
342	EXTEND (SP, CvDEPTH(cv)*2);	369	EXTEND (SP, 3);
343		370
344	while (--CvDEPTH(cv))
345	{
346	/* this tells the restore code to increment CvDEPTH */
347	PUSHs (Nullsv);
348	PUSHs ((SV *)cv);
349	}
350
351	PUSHs ((SV *)CvPADLIST(cv));	371	PUSHs ((SV *)CvPADLIST (cv));
		372	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
352	PUSHs ((SV *)cv);	373	PUSHs ((SV *)cv);
353		374
		375	CvDEPTH (cv) = 0;
354	get_padlist (aTHX_ cv);	376	get_padlist (cv);
355	}	377	}
356	}	378	}
357	#ifdef CXt_FORMAT	379	#ifdef CXt_FORMAT
358	else if (CxTYPE(cx) == CXt_FORMAT)	380	else if (CxTYPE (cx) == CXt_FORMAT)
359	{	381	{
360	/* 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? */
361	/* my bold guess is as a simple, plain sub... */	383	/* my bold guess is as a simple, plain sub... */
362	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");
363	}	385	}
…		…
373	}	395	}
374		396
375	PUTBACK;	397	PUTBACK;
376	}	398	}
377		399
378	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;
379	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	401	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
380	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;
381		404
382	c->dowarn = PL_dowarn;	405	#define VAR(name,type)c->name = PL_ ## name;
383	c->in_eval = PL_in_eval;	406	# include "state.h"
384		407	#undef VAR
385	c->curstackinfo = PL_curstackinfo;
386	c->curstack = PL_curstack;
387	c->mainstack = PL_mainstack;
388	c->stack_sp = PL_stack_sp;
389	c->op = PL_op;
390	c->curpad = PL_curpad;
391	c->comppad = PL_comppad;
392	c->compcv = PL_compcv;
393	c->stack_base = PL_stack_base;
394	c->stack_max = PL_stack_max;
395	c->tmps_stack = PL_tmps_stack;
396	c->tmps_floor = PL_tmps_floor;
397	c->tmps_ix = PL_tmps_ix;
398	c->tmps_max = PL_tmps_max;
399	c->markstack = PL_markstack;
400	c->markstack_ptr = PL_markstack_ptr;
401	c->markstack_max = PL_markstack_max;
402	c->scopestack = PL_scopestack;
403	c->scopestack_ix = PL_scopestack_ix;
404	c->scopestack_max = PL_scopestack_max;
405	c->savestack = PL_savestack;
406	c->savestack_ix = PL_savestack_ix;
407	c->savestack_max = PL_savestack_max;
408	#if PERL_VERSION < 9
409	c->retstack = PL_retstack;
410	c->retstack_ix = PL_retstack_ix;
411	c->retstack_max = PL_retstack_max;
412	#endif
413	c->curpm = PL_curpm;
414	c->curcop = PL_curcop;
415	c->top_env = PL_top_env;
416	}	408	}
417		409
418	/*	410	/*
419	* allocate various perl stacks. This is an exact copy	411	* allocate various perl stacks. This is an exact copy
420	* of perl.c:init_stacks, except that it uses less memory	412	* of perl.c:init_stacks, except that it uses less memory
421	* on the (sometimes correct) assumption that coroutines do	413	* on the (sometimes correct) assumption that coroutines do
422	* not usually need a lot of stackspace.	414	* not usually need a lot of stackspace.
423	*/	415	*/
424	static void	416	static void
425	coro_init_stacks (pTHX)	417	coro_init_stacks ()
426	{	418	{
427	LOCK;
428
429	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	419	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
430	PL_curstackinfo->si_type = PERLSI_MAIN;	420	PL_curstackinfo->si_type = PERLSI_MAIN;
431	PL_curstack = PL_curstackinfo->si_stack;	421	PL_curstack = PL_curstackinfo->si_stack;
432	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	422	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
433		423
434	PL_stack_base = AvARRAY(PL_curstack);	424	PL_stack_base = AvARRAY(PL_curstack);
435	PL_stack_sp = PL_stack_base;	425	PL_stack_sp = PL_stack_base;
436	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	426	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
437		427
438	New(50,PL_tmps_stack,96,SV*);	428	New(50,PL_tmps_stack,128,SV*);
439	PL_tmps_floor = -1;	429	PL_tmps_floor = -1;
440	PL_tmps_ix = -1;	430	PL_tmps_ix = -1;
441	PL_tmps_max = 96;	431	PL_tmps_max = 128;
442		432
443	New(54,PL_markstack,16,I32);	433	New(54,PL_markstack,32,I32);
444	PL_markstack_ptr = PL_markstack;	434	PL_markstack_ptr = PL_markstack;
445	PL_markstack_max = PL_markstack + 16;	435	PL_markstack_max = PL_markstack + 32;
446		436
447	#ifdef SET_MARK_OFFSET	437	#ifdef SET_MARK_OFFSET
448	SET_MARK_OFFSET;	438	SET_MARK_OFFSET;
449	#endif	439	#endif
450		440
451	New(54,PL_scopestack,16,I32);	441	New(54,PL_scopestack,32,I32);
452	PL_scopestack_ix = 0;	442	PL_scopestack_ix = 0;
453	PL_scopestack_max = 16;	443	PL_scopestack_max = 32;
454		444
455	New(54,PL_savestack,96,ANY);	445	New(54,PL_savestack,64,ANY);
456	PL_savestack_ix = 0;	446	PL_savestack_ix = 0;
457	PL_savestack_max = 96;	447	PL_savestack_max = 64;
458		448
459	#if PERL_VERSION < 9	449	#if !PERL_VERSION_ATLEAST (5,9,0)
460	New(54,PL_retstack,8,OP*);	450	New(54,PL_retstack,16,OP*);
461	PL_retstack_ix = 0;	451	PL_retstack_ix = 0;
462	PL_retstack_max = 8;	452	PL_retstack_max = 16;
463	#endif	453	#endif
464
465	UNLOCK;
466	}	454	}
467		455
468	/*	456	/*
469	* destroy the stacks, the callchain etc...	457	* destroy the stacks, the callchain etc...
470	*/	458	*/
471	static void	459	static void
472	destroy_stacks(pTHX)	460	coro_destroy_stacks ()
473	{	461	{
474	if (!IN_DESTRUCT)	462	if (!IN_DESTRUCT)
475	{	463	{
476	/* is this ugly, I ask? */	464	/* is this ugly, I ask? */
477	LEAVE_SCOPE (0);	465	LEAVE_SCOPE (0);
…		…
508		496
509	Safefree (PL_tmps_stack);	497	Safefree (PL_tmps_stack);
510	Safefree (PL_markstack);	498	Safefree (PL_markstack);
511	Safefree (PL_scopestack);	499	Safefree (PL_scopestack);
512	Safefree (PL_savestack);	500	Safefree (PL_savestack);
513	#if PERL_VERSION < 9	501	#if !PERL_VERSION_ATLEAST (5,9,0)
514	Safefree (PL_retstack);	502	Safefree (PL_retstack);
515	#endif	503	#endif
516	}	504	}
517		505
518	static void	506	static void
519	allocate_stack (Coro__State ctx, int alloc)	507	setup_coro (struct coro *coro)
520	{
521	coro_stack *stack;
522
523	New (0, stack, 1, coro_stack);
524
525	stack->refcnt = 1;
526	stack->usecnt = 1;
527	stack->gencnt = ctx->gencnt = 0;
528
529	if (alloc)
530	{
531	#if HAVE_MMAP
532	stack->ssize = STACKSIZE * sizeof (long); /* mmap should do allocate-on-write for us */
533	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
534	if (stack->sptr == (void *)-1)
535	#endif
536	{
537	stack->ssize = - (STACKSIZE * (long)sizeof (long));
538	New (0, stack->sptr, STACKSIZE, long);
539	}
540	}
541	else
542	stack->sptr = 0;
543
544	ctx->stack = stack;
545	}
546
547	static void
548	deallocate_stack (Coro__State ctx)
549	{
550	coro_stack *stack = ctx->stack;
551
552	ctx->stack = 0;
553
554	if (stack)
555	{
556	if (!--stack->refcnt)
557	{
558	#ifdef HAVE_MMAP
559	if (stack->ssize > 0 && stack->sptr)
560	munmap (stack->sptr, stack->ssize);
561	else
562	#endif
563	Safefree (stack->sptr);
564
565	Safefree (stack);
566	}
567	else if (ctx->gencnt == stack->gencnt)
568	--stack->usecnt;
569	}
570	}
571
572	static void
573	setup_coro (void *arg)
574	{	508	{
575	/*	509	/*
576	* emulate part of the perl startup here.	510	* emulate part of the perl startup here.
577	*/	511	*/
578	dTHX;	512
		513	coro_init_stacks ();
		514
		515	PL_curcop = &PL_compiling;
		516	PL_in_eval = EVAL_NULL;
		517	PL_curpm = 0;
		518	PL_localizing = 0;
		519	PL_dirty = 0;
		520	PL_restartop = 0;
		521
		522	{
		523	dSP;
		524	LOGOP myop;
		525
		526	SvREFCNT_dec (GvAV (PL_defgv));
		527	GvAV (PL_defgv) = coro->args; coro->args = 0;
		528
		529	Zero (&myop, 1, LOGOP);
		530	myop.op_next = Nullop;
		531	myop.op_flags = OPf_WANT_VOID;
		532
		533	PUSHMARK (SP);
		534	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		535	PUTBACK;
		536	PL_op = (OP *)&myop;
		537	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		538	SPAGAIN;
		539	}
		540
		541	ENTER; /* necessary e.g. for dounwind */
		542	}
		543
		544	static void
		545	free_coro_mortal ()
		546	{
		547	if (coro_mortal)
		548	{
		549	SvREFCNT_dec (coro_mortal);
		550	coro_mortal = 0;
		551	}
		552	}
		553
		554	/* inject a fake call to Coro::State::_cctx_init into the execution */
		555	static void NOINLINE
		556	prepare_cctx (coro_cctx *cctx)
		557	{
579	dSP;	558	dSP;
580	Coro__State ctx = (Coro__State)arg;	559	LOGOP myop;
581	SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
582		560
583	coro_init_stacks (aTHX);	561	Zero (&myop, 1, LOGOP);
584	/*PL_curcop = 0;*/	562	myop.op_next = PL_op;
585	/*PL_in_eval = PL_in_eval;*/ /* inherit */	563	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
586	SvREFCNT_dec (GvAV (PL_defgv));
587	GvAV (PL_defgv) = ctx->args; ctx->args = 0;
588		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);
589	SPAGAIN;	572	SPAGAIN;
590
591	if (ctx->stack)
592	{
593	ctx->cursp = 0;
594
595	PUSHMARK(SP);
596	PUTBACK;
597	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
598
599	if (SvTRUE (ERRSV))
600	croak (NULL);
601	else
602	croak ("FATAL: CCTXT coroutine returned!");
603	}
604	else
605	{
606	UNOP myop;
607
608	PL_op = (OP *)&myop;
609
610	Zero(&myop, 1, UNOP);
611	myop.op_next = Nullop;
612	myop.op_flags = OPf_WANT_VOID;
613
614	PUSHMARK(SP);
615	XPUSHs (sub_init);
616	/*
617	* the next line is slightly wrong, as PL_op->op_next
618	* is actually being executed so we skip the first op.
619	* that doesn't matter, though, since it is only
620	* pp_nextstate and we never return...
621	* ah yes, and I don't care anyways ;)
622	*/
623	PUTBACK;
624	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
625	SPAGAIN;
626
627	ENTER; /* necessary e.g. for dounwind */
628	}
629	}	573	}
630		574
631	static void	575	static void
632	continue_coro (void *arg)	576	coro_run (void *arg)
633	{	577	{
		578	/* coro_run is the alternative tail of transfer(), so unlock here. */
		579	UNLOCK;
		580
634	/*	581	/*
635	* this is a _very_ stripped down perl interpreter ;)	582	* this is a _very_ stripped down perl interpreter ;)
636	*/	583	*/
637	dTHX;
638	Coro__State ctx = (Coro__State)arg;
639
640	PL_top_env = &ctx->start_env;	584	PL_top_env = &PL_start_env;
641		585
642	ctx->cursp = 0;	586	/* inject call to cctx_init */
643	PL_op = PL_op->op_next;	587	prepare_cctx ((coro_cctx *)arg);
644	CALLRUNOPS(aTHX);
645		588
		589	/* somebody will hit me for both perl_run and PL_restartop */
		590	PL_restartop = PL_op;
		591	perl_run (PL_curinterp);
		592
		593	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
646	abort ();	594	abort ();
647	}	595	}
648		596
		597	static coro_cctx *
		598	cctx_new ()
		599	{
		600	coro_cctx *cctx;
		601
		602	++cctx_count;
		603
		604	Newz (0, cctx, 1, coro_cctx);
		605
		606	#if HAVE_MMAP
		607
		608	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		609	/* mmap supposedly does allocate-on-write for us */
		610	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		611
		612	if (cctx->sptr == (void *)-1)
		613	{
		614	perror ("FATAL: unable to mmap stack for coroutine");
		615	_exit (EXIT_FAILURE);
		616	}
		617
		618	# if STACKGUARD
		619	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		620	# endif
		621
		622	#else
		623
		624	cctx->ssize = STACKSIZE * (long)sizeof (long);
		625	New (0, cctx->sptr, STACKSIZE, long);
		626
		627	if (!cctx->sptr)
		628	{
		629	perror ("FATAL: unable to malloc stack for coroutine");
		630	_exit (EXIT_FAILURE);
		631	}
		632
		633	#endif
		634
		635	#if USE_VALGRIND
		636	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		637	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		638	cctx->ssize + (char *)cctx->sptr
		639	);
		640	#endif
		641
		642	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		643
		644	return cctx;
		645	}
		646
649	static void	647	static void
		648	cctx_destroy (coro_cctx *cctx)
		649	{
		650	if (!cctx)
		651	return;
		652
		653	--cctx_count;
		654
		655	#if USE_VALGRIND
		656	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		657	#endif
		658
		659	#if HAVE_MMAP
		660	munmap (cctx->sptr, cctx->ssize);
		661	#else
		662	Safefree (cctx->sptr);
		663	#endif
		664
		665	Safefree (cctx);
		666	}
		667
		668	static coro_cctx *
		669	cctx_get ()
		670	{
		671	coro_cctx *cctx;
		672
		673	if (cctx_first)
		674	{
		675	cctx = cctx_first;
		676	cctx_first = cctx->next;
		677	--cctx_idle;
		678	}
		679	else
		680	{
		681	cctx = cctx_new ();
		682	PL_op = PL_op->op_next;
		683	}
		684
		685	return cctx;
		686	}
		687
		688	static void
		689	cctx_put (coro_cctx *cctx)
		690	{
		691	/* free another cctx if overlimit */
		692	if (cctx_idle >= MAX_IDLE_CCTX)
		693	{
		694	coro_cctx *first = cctx_first;
		695	cctx_first = first->next;
		696	--cctx_idle;
		697
		698	assert (!first->inuse);
		699	cctx_destroy (first);
		700	}
		701
		702	++cctx_idle;
		703	cctx->next = cctx_first;
		704	cctx_first = cctx;
		705	}
		706
		707	/* never call directly, always through the coro_state_transfer global variable */
		708	static void NOINLINE
650	transfer (pTHX_ struct coro *prev, struct coro *next, int flags)	709	transfer (struct coro *prev, struct coro *next)
651	{	710	{
652	dSTACKLEVEL;	711	dSTACKLEVEL;
653		712
		713	/* sometimes transfer is only called to set idle_sp */
		714	if (!next)
		715	{
		716	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		717	assert (((coro_cctx *)prev)->top_env = PL_top_env); /* just for the side effetc when assert is enabled */
		718	}
654	if (prev != next)	719	else if (prev != next)
655	{	720	{
656	if (next->mainstack)	721	coro_cctx *prev__cctx;
		722
		723	if (prev->flags & CF_NEW)
657	{	724	{
658	LOCK;	725	/* create a new empty context */
659	SAVE (prev, flags);	726	Newz (0, prev->cctx, 1, coro_cctx);
660	LOAD (next);	727	prev->cctx->inuse = 1;
661	UNLOCK;	728	prev->flags &= ~CF_NEW;
662		729	prev->flags |= CF_RUNNING;
663	/* mark this state as in-use */
664	next->mainstack = 0;
665	next->tmps_ix = -2;
666
667	/* stacklevel changed? if yes, grab the stack for us! */
668	if (flags & TRANSFER_SAVE_CCTXT)
669	{
670	if (!prev->stack)
671	allocate_stack (prev, 0);
672	else if (prev->cursp != stacklevel
673	&& prev->stack->usecnt > 1)
674	{
675	prev->gencnt = ++prev->stack->gencnt;
676	prev->stack->usecnt = 1;
677	}
678
679	/* has our stack been invalidated? */
680	if (next->stack && next->stack->gencnt != next->gencnt)
681	{
682	deallocate_stack (next);
683	allocate_stack (next, 1);
684	coro_create (&(next->stack->cctx),
685	continue_coro, (void *)next,
686	next->stack->sptr, labs (next->stack->ssize));
687	}
688
689	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
690	prev->cursp = stacklevel;
691	/* don't add any code here */
692	}
693	else
694	next->cursp = stacklevel;
695	}	730	}
696	else if (next->tmps_ix == -2)	731
697	croak ("tried to transfer to running coroutine");	732	/*TODO: must not croak here */
		733	if (!prev->flags & CF_RUNNING)
		734	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		735
		736	if (next->flags & CF_RUNNING)
		737	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		738
		739	prev->flags &= ~CF_RUNNING;
		740	next->flags |= CF_RUNNING;
		741
		742	LOCK;
		743
		744	if (next->flags & CF_NEW)
		745	{
		746	/* need to start coroutine */
		747	next->flags &= ~CF_NEW;
		748	/* first get rid of the old state */
		749	save_perl (prev);
		750	/* setup coroutine call */
		751	setup_coro (next);
		752	/* need a new stack */
		753	assert (!next->cctx);
		754	}
698	else	755	else
699	{	756	{
700	LOCK;	757	/* coroutine already started */
701	SAVE (prev, -1); /* first get rid of the old state */	758	save_perl (prev);
702	UNLOCK;	759	load_perl (next);
703
704	if (flags & TRANSFER_SAVE_CCTXT)
705	{
706	if (!prev->stack)
707	allocate_stack (prev, 0);
708
709	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
710	{
711	PL_top_env = &next->start_env;
712
713	setup_coro (next);
714	next->cursp = stacklevel;
715
716	prev->stack->refcnt++;
717	prev->stack->usecnt++;
718	next->stack = prev->stack;
719	next->gencnt = prev->gencnt;
720	}
721	else
722	{
723	assert (!next->stack);
724	allocate_stack (next, 1);
725	coro_create (&(next->stack->cctx),
726	setup_coro, (void *)next,
727	next->stack->sptr, labs (next->stack->ssize));
728	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
729	prev->cursp = stacklevel;
730	/* don't add any code here */
731	}
732	}
733	else
734	{
735	setup_coro (next);
736	next->cursp = stacklevel;
737	}
738	}	760	}
		761
		762	prev__cctx = prev->cctx;
		763
		764	/* possibly "free" the cctx */
		765	if (prev__cctx->idle_sp == STACKLEVEL)
		766	{
		767	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		768	assert (PL_top_env == prev__cctx->top_env);
		769
		770	prev->cctx = 0;
		771
		772	cctx_put (prev__cctx);
		773	prev__cctx->inuse = 0;
		774	}
		775
		776	if (!next->cctx)
		777	{
		778	next->cctx = cctx_get ();
		779	assert (!next->cctx->inuse);
		780	next->cctx->inuse = 1;
		781	}
		782
		783	if (prev__cctx != next->cctx)
		784	{
		785	prev__cctx->top_env = PL_top_env;
		786	PL_top_env = next->cctx->top_env;
		787	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		788	}
		789
		790	free_coro_mortal ();
		791
		792	UNLOCK;
739	}	793	}
		794	}
740		795
741	LOCK;	796	struct transfer_args
742	if (coro_mortal)	797	{
		798	struct coro *prev, *next;
		799	};
		800
		801	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		802
		803	static void
		804	coro_state_destroy (struct coro *coro)
		805	{
		806	if (coro->refcnt--)
		807	return;
		808
		809	if (coro->mainstack && coro->mainstack != main_mainstack)
743	{	810	{
744	SvREFCNT_dec (coro_mortal);	811	struct coro temp;
		812	Zero (&temp, 1, struct coro);
		813	temp.save = CORO_SAVE_ALL;
		814
		815	if (coro->flags & CF_RUNNING)
		816	croak ("FATAL: tried to destroy currently running coroutine");
		817
		818	save_perl (&temp);
		819	load_perl (coro);
		820
		821	coro_destroy_stacks ();
		822
		823	load_perl (&temp); /* this will get rid of defsv etc.. */
		824
745	coro_mortal = 0;	825	coro->mainstack = 0;
746	}	826	}
747	UNLOCK;
748	}
749		827
750	#define SV_CORO(sv,func) \	828	cctx_destroy (coro->cctx);
751	do { \	829	SvREFCNT_dec (coro->args);
752	if (SvROK (sv)) \	830	Safefree (coro);
753	sv = SvRV (sv); \	831	}
754	\
755	if (SvTYPE (sv) == SVt_PVHV) \
756	{ \
757	HE *he = hv_fetch_ent ((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
758	\
759	if (!he) \
760	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
761	\
762	(sv) = SvRV (HeVAL(he)); \
763	} \
764	\
765	/* must also be changed inside Coro::Cont::yield */ \
766	if (!SvOBJECT (sv) || SvSTASH (sv) != coro_state_stash) \
767	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
768	\
769	} while(0)
770		832
771	#define SvSTATE(sv) INT2PTR (struct coro *, SvIV (sv))
772
773	static void	833	static int
		834	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		835	{
		836	struct coro *coro = (struct coro *)mg->mg_ptr;
		837	mg->mg_ptr = 0;
		838
		839	coro_state_destroy (coro);
		840
		841	return 0;
		842	}
		843
		844	static int
		845	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		846	{
		847	struct coro *coro = (struct coro *)mg->mg_ptr;
		848
		849	++coro->refcnt;
		850
		851	return 0;
		852	}
		853
		854	static MGVTBL coro_state_vtbl = {
		855	0, 0, 0, 0,
		856	coro_state_clear,
		857	0,
		858	#ifdef MGf_DUP
		859	coro_state_dup,
		860	#else
		861	# define MGf_DUP 0
		862	#endif
		863	};
		864
		865	static struct coro *
		866	SvSTATE (SV *coro)
		867	{
		868	HV *stash;
		869	MAGIC *mg;
		870
		871	if (SvROK (coro))
		872	coro = SvRV (coro);
		873
		874	stash = SvSTASH (coro);
		875	if (stash != coro_stash && stash != coro_state_stash)
		876	{
		877	/* very slow, but rare, check */
		878	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		879	croak ("Coro::State object required");
		880	}
		881
		882	mg = SvMAGIC (coro);
		883	assert (mg->mg_type == PERL_MAGIC_ext);
		884	return (struct coro *)mg->mg_ptr;
		885	}
		886
		887	static void
		888	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		889	{
		890	ta->prev = SvSTATE (prev_sv);
		891	ta->next = SvSTATE (next_sv);
		892	}
		893
		894	static void
774	api_transfer(pTHX_ SV *prev, SV *next, int flags)	895	api_transfer (SV *prev_sv, SV *next_sv)
775	{	896	{
776	SV_CORO (prev, "Coro::transfer");	897	struct transfer_args ta;
777	SV_CORO (next, "Coro::transfer");
778		898
779	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	899	prepare_transfer (&ta, prev_sv, next_sv);
		900	TRANSFER (ta);
		901	}
		902
		903	static int
		904	api_save (SV *coro_sv, int new_save)
		905	{
		906	struct coro *coro = SvSTATE (coro_sv);
		907	int old_save = coro->save;
		908
		909	if (new_save >= 0)
		910	coro->save = new_save;
		911
		912	return old_save;
780	}	913	}
781		914
782	/** Coro ********************************************************************/	915	/** Coro ********************************************************************/
783		916
784	#define PRIO_MAX 3	917	#define PRIO_MAX 3
…		…
787	#define PRIO_LOW -1	920	#define PRIO_LOW -1
788	#define PRIO_IDLE -3	921	#define PRIO_IDLE -3
789	#define PRIO_MIN -4	922	#define PRIO_MIN -4
790		923
791	/* for Coro.pm */	924	/* for Coro.pm */
792	static GV *coro_current, *coro_idle;	925	static SV *coro_current;
793	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];	926	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
794	static int coro_nready;	927	static int coro_nready;
795		928
796	static void	929	static void
797	coro_enq (pTHX_ SV *sv)	930	coro_enq (SV *coro_sv)
798	{	931	{
799	SV **xprio;
800	int prio;
801
802	if (SvTYPE (sv) != SVt_PVHV)
803	croak ("Coro::ready tried to enqueue something that is not a coroutine");
804
805	xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
806	prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
807
808	prio = prio > PRIO_MAX ? PRIO_MAX
809	: prio < PRIO_MIN ? PRIO_MIN
810	: prio;
811
812	av_push (coro_ready [prio - PRIO_MIN], sv);	932	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
813	coro_nready++;	933	coro_nready++;
814	}	934	}
815		935
816	static SV *	936	static SV *
817	coro_deq (pTHX_ int min_prio)	937	coro_deq (int min_prio)
818	{	938	{
819	int prio = PRIO_MAX - PRIO_MIN;	939	int prio = PRIO_MAX - PRIO_MIN;
820		940
821	min_prio -= PRIO_MIN;	941	min_prio -= PRIO_MIN;
822	if (min_prio < 0)	942	if (min_prio < 0)
823	min_prio = 0;	943	min_prio = 0;
824		944
825	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	945	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
826	if (av_len (coro_ready[prio]) >= 0)	946	if (AvFILLp (coro_ready [prio]) >= 0)
827	{	947	{
828	coro_nready--;	948	coro_nready--;
829	return av_shift (coro_ready[prio]);	949	return av_shift (coro_ready [prio]);
830	}	950	}
831		951
832	return 0;	952	return 0;
833	}	953	}
834		954
835	static void	955	static int
836	api_ready (SV *coro)	956	api_ready (SV *coro_sv)
837	{	957	{
838	dTHX;	958	struct coro *coro;
839		959
840	if (SvROK (coro))	960	if (SvROK (coro_sv))
841	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;
842		974
843	LOCK;	975	LOCK;
844	coro_enq (aTHX_ SvREFCNT_inc (coro));	976	coro_enq (SvREFCNT_inc (coro_sv));
845	UNLOCK;	977	UNLOCK;
		978
		979	return 1;
		980	}
		981
		982	static int
		983	api_is_ready (SV *coro_sv)
		984	{
		985	return !!SvSTATE (coro_sv)->flags & CF_READY;
		986	}
		987
		988	static void
		989	prepare_schedule (struct transfer_args *ta)
		990	{
		991	SV *prev, *next;
		992
		993	for (;;)
		994	{
		995	LOCK;
		996	next = coro_deq (PRIO_MIN);
		997	UNLOCK;
		998
		999	if (next)
		1000	break;
		1001
		1002	{
		1003	dSP;
		1004
		1005	ENTER;
		1006	SAVETMPS;
		1007
		1008	PUSHMARK (SP);
		1009	PUTBACK;
		1010	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1011
		1012	FREETMPS;
		1013	LEAVE;
		1014	}
		1015	}
		1016
		1017	prev = SvRV (coro_current);
		1018	SvRV_set (coro_current, next);
		1019
		1020	/* free this only after the transfer */
		1021	LOCK;
		1022	free_coro_mortal ();
		1023	UNLOCK;
		1024	coro_mortal = prev;
		1025
		1026	assert (!SvROK(prev));//D
		1027	assert (!SvROK(next));//D
		1028
		1029	ta->prev = SvSTATE (prev);
		1030	ta->next = SvSTATE (next);
		1031
		1032	assert (ta->next->flags & CF_READY);
		1033	ta->next->flags &= ~CF_READY;
		1034	}
		1035
		1036	static void
		1037	prepare_cede (struct transfer_args *ta)
		1038	{
		1039	api_ready (coro_current);
		1040
		1041	prepare_schedule (ta);
846	}	1042	}
847		1043
848	static void	1044	static void
849	api_schedule (void)	1045	api_schedule (void)
850	{	1046	{
851	dTHX;	1047	struct transfer_args ta;
852		1048
853	SV *prev, *next;	1049	prepare_schedule (&ta);
854		1050	TRANSFER (ta);
855	LOCK;
856
857	prev = SvRV (GvSV (coro_current));
858	next = coro_deq (aTHX_ PRIO_MIN);
859
860	if (!next)
861	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
862
863	/* free this only after the transfer */
864	coro_mortal = prev;
865	SV_CORO (prev, "Coro::schedule");
866
867	SvRV (GvSV (coro_current)) = next;
868
869	SV_CORO (next, "Coro::schedule");
870
871	UNLOCK;
872
873	transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
874	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
875	}	1051	}
876		1052
877	static void	1053	static void
878	api_cede (void)	1054	api_cede (void)
879	{	1055	{
880	dTHX;	1056	struct transfer_args ta;
881		1057
882	LOCK;	1058	prepare_cede (&ta);
883	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));	1059	TRANSFER (ta);
884	UNLOCK;
885
886	api_schedule ();
887	}	1060	}
888		1061
889	MODULE = Coro::State PACKAGE = Coro::State	1062	MODULE = Coro::State PACKAGE = Coro::State
890		1063
891	PROTOTYPES: ENABLE	1064	PROTOTYPES: DISABLE
892		1065
893	BOOT:	1066	BOOT:
894	{ /* {} necessary for stoopid perl-5.6.x */	1067	{
895	#ifdef USE_ITHREADS	1068	#ifdef USE_ITHREADS
896	MUTEX_INIT (&coro_mutex);	1069	MUTEX_INIT (&coro_mutex);
897	#endif	1070	#endif
		1071	BOOT_PAGESIZE;
898		1072
899	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);
900	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);
901	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1073	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
902		1074
903	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1075	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
904	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1076	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
905	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));
906	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1079	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
907		1080
908	main_mainstack = PL_mainstack;	1081	main_mainstack = PL_mainstack;
909		1082
910	coroapi.ver = CORO_API_VERSION;	1083	coroapi.ver = CORO_API_VERSION;
911	coroapi.transfer = api_transfer;	1084	coroapi.transfer = api_transfer;
912	}
913		1085
914	Coro::State	1086	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
915	_newprocess(args)	1087	}
916	SV * args	1088
917	PROTOTYPE: $	1089	SV *
		1090	new (char *klass, ...)
918	CODE:	1091	CODE:
919	Coro__State coro;	1092	{
		1093	struct coro *coro;
		1094	HV *hv;
		1095	int i;
920		1096
921	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
922	croak ("Coro::State::_newprocess expects an arrayref");
923
924	Newz (0, coro, 1, struct coro);	1097	Newz (0, coro, 1, struct coro);
		1098	coro->args = newAV ();
		1099	coro->save = CORO_SAVE_ALL;
		1100	coro->flags = CF_NEW;
925		1101
926	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1102	hv = newHV ();
927	/*coro->mainstack = 0; *//*actual work is done inside transfer */	1103	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
928	/*coro->stack = 0;*/	1104	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
929		1105
930	/* same as JMPENV_BOOTSTRAP */	1106	for (i = 1; i < items; i++)
931	/* we might be able to recycle start_env, but safe is safe */	1107	av_push (coro->args, newSVsv (ST (i)));
932	/*Zero(&coro->start_env, 1, JMPENV);*/	1108	}
933	coro->start_env.je_ret = -1;
934	coro->start_env.je_mustcatch = TRUE;
935
936	RETVAL = coro;
937	OUTPUT:	1109	OUTPUT:
938	RETVAL	1110	RETVAL
939		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
940	void	1119	void
941	transfer(prev, next, flags)	1120	_set_stacklevel (...)
942	SV *prev	1121	ALIAS:
943	SV *next	1122	Coro::State::transfer = 1
944	int flags	1123	Coro::schedule = 2
945	PROTOTYPE: @	1124	Coro::cede = 3
946	CODE:	1125	CODE:
947	PUTBACK;	1126	{
948	SV_CORO (next, "Coro::transfer");	1127	struct transfer_args ta;
949	SV_CORO (prev, "Coro::transfer");	1128
950	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1129	switch (ix)
951	SPAGAIN;	1130	{
		1131	case 0:
		1132	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1133	ta.next = 0;
		1134	break;
		1135
		1136	case 1:
		1137	if (items != 2)
		1138	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1139
		1140	prepare_transfer (&ta, ST (0), ST (1));
		1141	break;
		1142
		1143	case 2:
		1144	prepare_schedule (&ta);
		1145	break;
		1146
		1147	case 3:
		1148	prepare_cede (&ta);
		1149	break;
		1150	}
		1151
		1152	TRANSFER (ta);
		1153	}
952		1154
953	void	1155	void
954	DESTROY(coro)	1156	_clone_state_from (SV *dst, SV *src)
955	Coro::State coro	1157	CODE:
956	CODE:	1158	{
		1159	struct coro *coro_src = SvSTATE (src);
957		1160
958	if (coro->mainstack && coro->mainstack != main_mainstack)	1161	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
959	{
960	struct coro temp;
961		1162
962	PUTBACK;	1163	++coro_src->refcnt;
963	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);	1164	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
964	LOAD (aTHX_ coro);	1165	}
965	SPAGAIN;
966
967	destroy_stacks (aTHX);
968
969	LOAD ((&temp)); /* this will get rid of defsv etc.. */
970	SPAGAIN;
971
972	coro->mainstack = 0;
973	}
974
975	deallocate_stack (coro);
976	SvREFCNT_dec (coro->args);
977	Safefree (coro);
978		1166
979	void	1167	void
980	_exit(code)	1168	_exit (code)
981	int code	1169	int code
982	PROTOTYPE: $	1170	PROTOTYPE: $
983	CODE:	1171	CODE:
984	_exit (code);	1172	_exit (code);
985		1173
986	MODULE = Coro::State PACKAGE = Coro::Cont	1174	int
		1175	cctx_count ()
		1176	CODE:
		1177	RETVAL = cctx_count;
		1178	OUTPUT:
		1179	RETVAL
987		1180
988	# this is slightly dirty (should expose a c-level api)	1181	int
989		1182	cctx_idle ()
990	void	1183	CODE:
991	yield(...)	1184	RETVAL = cctx_idle;
992	PROTOTYPE: @	1185	OUTPUT:
993	CODE:	1186	RETVAL
994	SV *yieldstack;
995	SV *sv;
996	AV *defav = GvAV (PL_defgv);
997	struct coro *prev, *next;
998
999	yieldstack = *hv_fetch (
1000	(HV *)SvRV (GvSV (coro_current)),
1001	"yieldstack", sizeof ("yieldstack") - 1,
1002	0
1003	);
1004
1005	/* set up @_ -- ugly */
1006	av_clear (defav);
1007	av_fill (defav, items - 1);
1008	while (items--)
1009	av_store (defav, items, SvREFCNT_inc (ST(items)));
1010
1011	sv = av_pop ((AV *)SvRV (yieldstack));
1012	prev = INT2PTR (struct coro *, SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0))));
1013	next = INT2PTR (struct coro *, SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0))));
1014	SvREFCNT_dec (sv);
1015
1016	transfer (aTHX_ prev, next, 0);
1017		1187
1018	MODULE = Coro::State PACKAGE = Coro	1188	MODULE = Coro::State PACKAGE = Coro
1019		1189
1020	# this is slightly dirty (should expose a c-level api)
1021
1022	BOOT:	1190	BOOT:
1023	{	1191	{
1024	int i;	1192	int i;
		1193
1025	HV *stash = gv_stashpv ("Coro", TRUE);	1194	coro_stash = gv_stashpv ("Coro", TRUE);
1026		1195
1027	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1196	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1028	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1197	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1029	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1198	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1030	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1199	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1031	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1200	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1032	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1201	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1033		1202
1034	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1203	coro_current = get_sv ("Coro::current", FALSE);
1035	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1204	SvREADONLY_on (coro_current);
1036		1205
1037	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1206	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1038	coro_ready[i] = newAV ();	1207	coro_ready[i] = newAV ();
1039		1208
1040	{	1209	{
1041	SV *sv = perl_get_sv("Coro::API", 1);	1210	SV *sv = perl_get_sv("Coro::API", 1);
1042		1211
1043	coroapi.schedule = api_schedule;	1212	coroapi.schedule = api_schedule;
		1213	coroapi.save = api_save;
1044	coroapi.cede = api_cede;	1214	coroapi.cede = api_cede;
1045	coroapi.ready = api_ready;	1215	coroapi.ready = api_ready;
		1216	coroapi.is_ready = api_is_ready;
1046	coroapi.nready = &coro_nready;	1217	coroapi.nready = &coro_nready;
1047	coroapi.current = coro_current;	1218	coroapi.current = coro_current;
1048		1219
1049	GCoroAPI = &coroapi;	1220	GCoroAPI = &coroapi;
1050	sv_setiv(sv, (IV)&coroapi);	1221	sv_setiv (sv, (IV)&coroapi);
1051	SvREADONLY_on(sv);	1222	SvREADONLY_on (sv);
1052	}	1223	}
1053	}	1224	}
1054		1225
1055	#if !PERL_MICRO
1056
1057	void	1226	void
1058	ready(self)	1227	_set_current (SV *current)
1059	SV * self
1060	PROTOTYPE: $	1228	PROTOTYPE: $
1061	CODE:	1229	CODE:
1062	api_ready (self);	1230	SvREFCNT_dec (SvRV (coro_current));
1063		1231	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1064	#endif
1065		1232
1066	int	1233	int
		1234	prio (Coro::State coro, int newprio = 0)
		1235	ALIAS:
		1236	nice = 1
		1237	CODE:
		1238	{
		1239	RETVAL = coro->prio;
		1240
		1241	if (items > 1)
		1242	{
		1243	if (ix)
		1244	newprio += coro->prio;
		1245
		1246	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1247	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1248
		1249	coro->prio = newprio;
		1250	}
		1251	}
		1252
		1253	SV *
		1254	ready (SV *self)
		1255	PROTOTYPE: $
		1256	CODE:
		1257	RETVAL = boolSV (api_ready (self));
		1258	OUTPUT:
		1259	RETVAL
		1260
		1261	SV *
		1262	is_ready (SV *self)
		1263	PROTOTYPE: $
		1264	CODE:
		1265	RETVAL = boolSV (api_is_ready (self));
		1266	OUTPUT:
		1267	RETVAL
		1268
		1269	int
1067	nready(...)	1270	nready (...)
1068	PROTOTYPE:	1271	PROTOTYPE:
1069	CODE:	1272	CODE:
1070	RETVAL = coro_nready;	1273	RETVAL = coro_nready;
1071	OUTPUT:	1274	OUTPUT:
1072	RETVAL	1275	RETVAL
1073		1276
1074	void	1277	MODULE = Coro::State PACKAGE = Coro::AIO
1075	schedule(...)	1278
1076	PROTOTYPE:	1279	SV *
		1280	_get_state ()
1077	CODE:	1281	CODE:
1078	api_schedule ();
1079
1080	void
1081	cede(...)
1082	PROTOTYPE:
1083	CODE:
1084	api_cede ();
1085
1086	# and these are hacks
1087	SV *
1088	_aio_get_state ()
1089	CODE:
1090	{	1282	{
1091	struct {	1283	struct io_state *data;
1092	int errorno;
1093	int laststype;
1094	int laststatval;
1095	Stat_t statcache;
1096	} data;
1097		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
1098	data.errorno = errno;	1290	data->errorno = errno;
1099	data.laststype = PL_laststype;	1291	data->laststype = PL_laststype;
1100	data.laststatval = PL_laststatval;	1292	data->laststatval = PL_laststatval;
1101	data.statcache = PL_statcache;	1293	data->statcache = PL_statcache;
1102
1103	RETVAL = newSVpvn ((char *)&data, sizeof data);
1104	}	1294	}
1105	OUTPUT:	1295	OUTPUT:
1106	RETVAL	1296	RETVAL
1107		1297
1108	void	1298	void
1109	_aio_set_state (char *data_)	1299	_set_state (char *data_)
1110	PROTOTYPE: $	1300	PROTOTYPE: $
1111	CODE:	1301	CODE:
1112	{	1302	{
1113	struct {	1303	struct io_state *data = (void *)data_;
1114	int errorno;
1115	int laststype;
1116	int laststatval;
1117	Stat_t statcache;
1118	} *data = (void *)data_;
1119		1304
1120	errno = data->errorno;	1305	errno = data->errorno;
1121	PL_laststype = data->laststype;	1306	PL_laststype = data->laststype;
1122	PL_laststatval = data->laststatval;	1307	PL_laststatval = data->laststatval;
1123	PL_statcache = data->statcache;	1308	PL_statcache = data->statcache;
1124	}	1309	}
		1310

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