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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.92 by root, Sun Nov 26 02:16:19 2006 UTC vs.
Revision 1.125 by root, Mon Dec 11 20:54:45 2006 UTC

1	#define PERL_NO_GET_CONTEXT
2
3	#include "libcoro/coro.c"	1	#include "libcoro/coro.c"
4		2
5	#include "EXTERN.h"	3	#include "EXTERN.h"
6	#include "perl.h"	4	#include "perl.h"
7	#include "XSUB.h"	5	#include "XSUB.h"
8		6
9	#include "patchlevel.h"	7	#include "patchlevel.h"
10		8
11	#if PERL_VERSION < 6	9	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	/* the maximum number of idle cctx that will be pooled */
		14	#define MAX_IDLE_CCTX 8
		15
		16	#define PERL_VERSION_ATLEAST(a,b,c) \
		17	(PERL_REVISION > (a) \
		18	|| (PERL_REVISION == (a) \
		19	&& (PERL_VERSION > (b) \
		20	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		21
		22	#if !PERL_VERSION_ATLEAST (5,6,0)
12	# ifndef PL_ppaddr	23	# ifndef PL_ppaddr
13	# define PL_ppaddr ppaddr	24	# define PL_ppaddr ppaddr
14	# endif	25	# endif
15	# ifndef call_sv	26	# ifndef call_sv
16	# define call_sv perl_call_sv	27	# define call_sv perl_call_sv
…		…
27	# ifndef IS_PADCONST	38	# ifndef IS_PADCONST
28	# define IS_PADCONST(v) 0	39	# define IS_PADCONST(v) 0
29	# endif	40	# endif
30	#endif	41	#endif
31		42
		43	/* 5.8.7 */
		44	#ifndef SvRV_set
		45	# define SvRV_set(s,v) SvRV(s) = (v)
		46	#endif
		47
32	#include <stdio.h>	48	#include <stdio.h>
33	#include <errno.h>	49	#include <errno.h>
		50	#include <assert.h>
34		51
35	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64	52	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
36	# undef STACKGUARD	53	# undef STACKGUARD
37	#endif	54	#endif
38		55
…		…
54	# ifndef PAGESIZE	71	# ifndef PAGESIZE
55	# define PAGESIZE pagesize	72	# define PAGESIZE pagesize
56	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)	73	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
57	static long pagesize;	74	static long pagesize;
58	# else	75	# else
59	# define BOOT_PAGESIZE	76	# define BOOT_PAGESIZE (void)0
60	# endif	77	# endif
		78	#else
		79	# define PAGESIZE 0
		80	# define BOOT_PAGESIZE (void)0
61	#endif	81	#endif
62		82
63	/* The next macro should declare a variable stacklevel that contains and approximation	83	/* The next macro should declare a variable stacklevel that contains and approximation
64	* to the current C stack pointer. Its property is that it changes with each call	84	* to the current C stack pointer. Its property is that it changes with each call
65	* and should be unique. */	85	* and should be unique. */
66	#define dSTACKLEVEL int stacklevel	86	#define dSTACKLEVEL int stacklevel
67	#define STACKLEVEL ((void *)&stacklevel)	87	#define STACKLEVEL ((void *)&stacklevel)
68		88
69	#define IN_DESTRUCT (PL_main_cv == Nullcv)	89	#define IN_DESTRUCT (PL_main_cv == Nullcv)
70		90
71	#define labs(l) ((l) >= 0 ? (l) : -(l))	91	#if __GNUC__ >= 3
		92	# define attribute(x) __attribute__(x)
		93	#else
		94	# define attribute(x)
		95	#endif
		96
		97	#define NOINLINE attribute ((noinline))
72		98
73	#include "CoroAPI.h"	99	#include "CoroAPI.h"
74
75	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
76		100
77	#ifdef USE_ITHREADS	101	#ifdef USE_ITHREADS
78	static perl_mutex coro_mutex;	102	static perl_mutex coro_mutex;
79	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)	103	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
80	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)	104	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
81	#else	105	#else
82	# define LOCK (void)0	106	# define LOCK (void)0
83	# define UNLOCK (void)0	107	# define UNLOCK (void)0
84	#endif	108	#endif
85		109
		110	struct io_state
		111	{
		112	int errorno;
		113	I32 laststype;
		114	int laststatval;
		115	Stat_t statcache;
		116	};
		117
86	static struct CoroAPI coroapi;	118	static struct CoroAPI coroapi;
87	static AV *main_mainstack; /* used to differentiate between $main and others */	119	static AV *main_mainstack; /* used to differentiate between $main and others */
88	static HV *coro_state_stash, *coro_stash;	120	static HV *coro_state_stash, *coro_stash;
89	static SV *coro_mortal; /* will be freed after next transfer */	121	static SV *coro_mortal; /* will be freed after next transfer */
90		122
		123	static struct coro_cctx *cctx_first;
		124	static int cctx_count, cctx_idle;
		125
91	/* this is a structure representing a c-level coroutine */	126	/* this is a structure representing a c-level coroutine */
92	typedef struct coro_stack {	127	typedef struct coro_cctx {
93	struct coro_stack *next;	128	struct coro_cctx *next;
94		129
95	void *idle_sp; /* original stacklevel when coroutine was created */	130	/* the stack */
96	void *sptr;	131	void *sptr;
97	long ssize; /* positive == mmap, otherwise malloc */	132	long ssize; /* positive == mmap, otherwise malloc */
98		133
99	/* cpu state */	134	/* cpu state */
		135	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		136	JMPENV *top_env;
100	coro_context cctx;	137	coro_context cctx;
101	JMPENV *top_env;
102	} coro_stack;
103		138
104	/* the (fake) coro_stack representing the main program */	139	int inuse;
105	static coro_stack *main_stack;	140
		141	#if USE_VALGRIND
		142	int valgrind_id;
		143	#endif
		144	} coro_cctx;
		145
		146	enum {
		147	CF_RUNNING = 0x0001, /* coroutine is running */
		148	CF_READY = 0x0002, /* coroutine is ready */
		149	CF_NEW = 0x0004, /* ahs never been switched to */
		150	};
106		151
107	/* this is a structure representing a perl-level coroutine */	152	/* this is a structure representing a perl-level coroutine */
108	struct coro {	153	struct coro {
109	/* the c coroutine allocated to this perl coroutine, if any */	154	/* the c coroutine allocated to this perl coroutine, if any */
110	coro_stack *stack;	155	coro_cctx *cctx;
111		156
112	/* data associated with this coroutine (initial args) */	157	/* data associated with this coroutine (initial args) */
113	AV *args;	158	AV *args;
114	int refcnt;	159	int refcnt;
		160	int save; /* CORO_SAVE flags */
		161	int flags; /* CF_ flags */
115		162
116	/* optionally saved, might be zero */	163	/* optionally saved, might be zero */
117	AV *defav;	164	AV *defav; /* @_ */
118	SV *defsv;	165	SV *defsv; /* $_ */
119	SV *errsv;	166	SV *errsv; /* $@ */
		167	SV *irssv; /* $/ */
		168	SV *irssv_sv; /* real $/ cache */
120		169
121	/* saved global state not related to stacks */	170	#define VAR(name,type) type name;
122	U8 dowarn;	171	# include "state.h"
123	I32 in_eval;	172	#undef VAR
124
125	/* the stacks and related info (callchain etc..) */
126	PERL_SI *curstackinfo;
127	AV *curstack;
128	AV *mainstack;
129	SV **stack_sp;
130	OP *op;
131	SV **curpad;
132	AV *comppad;
133	CV *compcv;
134	SV **stack_base;
135	SV **stack_max;
136	SV **tmps_stack;
137	I32 tmps_floor;
138	I32 tmps_ix;
139	I32 tmps_max;
140	I32 *markstack;
141	I32 *markstack_ptr;
142	I32 *markstack_max;
143	I32 *scopestack;
144	I32 scopestack_ix;
145	I32 scopestack_max;
146	ANY *savestack;
147	I32 savestack_ix;
148	I32 savestack_max;
149	OP **retstack;
150	I32 retstack_ix;
151	I32 retstack_max;
152	PMOP *curpm;
153	COP *curcop;
154		173
155	/* coro process data */	174	/* coro process data */
156	int prio;	175	int prio;
157	};	176	};
158		177
159	typedef struct coro *Coro__State;	178	typedef struct coro *Coro__State;
160	typedef struct coro *Coro__State_or_hashref;	179	typedef struct coro *Coro__State_or_hashref;
161		180
162	static AV *	181	static AV *
163	coro_clone_padlist (pTHX_ CV *cv)	182	coro_clone_padlist (CV *cv)
164	{	183	{
165	AV *padlist = CvPADLIST (cv);	184	AV *padlist = CvPADLIST (cv);
166	AV *newpadlist, *newpad;	185	AV *newpadlist, *newpad;
167		186
168	newpadlist = newAV ();	187	newpadlist = newAV ();
169	AvREAL_off (newpadlist);	188	AvREAL_off (newpadlist);
170	#if PERL_VERSION < 9	189	#if PERL_VERSION_ATLEAST (5,9,0)
		190	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		191	#else
171	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);	192	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
172	#else
173	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
174	#endif	193	#endif
175	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];	194	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
176	--AvFILLp (padlist);	195	--AvFILLp (padlist);
177		196
178	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));	197	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
…		…
180		199
181	return newpadlist;	200	return newpadlist;
182	}	201	}
183		202
184	static void	203	static void
185	free_padlist (pTHX_ AV *padlist)	204	free_padlist (AV *padlist)
186	{	205	{
187	/* may be during global destruction */	206	/* may be during global destruction */
188	if (SvREFCNT (padlist))	207	if (SvREFCNT (padlist))
189	{	208	{
190	I32 i = AvFILLp (padlist);	209	I32 i = AvFILLp (padlist);
…		…
211	AV *padlist;	230	AV *padlist;
212	AV *av = (AV *)mg->mg_obj;	231	AV *av = (AV *)mg->mg_obj;
213		232
214	/* casting is fun. */	233	/* casting is fun. */
215	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	234	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
216	free_padlist (aTHX_ padlist);	235	free_padlist (padlist);
217		236
218	SvREFCNT_dec (av);	237	SvREFCNT_dec (av);
219		238
220	return 0;	239	return 0;
221	}	240	}
222		241
223	#define PERL_MAGIC_coro PERL_MAGIC_ext	242	#define PERL_MAGIC_coro PERL_MAGIC_ext
224		243
225	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	244	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
226		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
227	/* the next two functions merely cache the padlists */	253	/* the next two functions merely cache the padlists */
228	static void	254	static void
229	get_padlist (pTHX_ CV *cv)	255	get_padlist (CV *cv)
230	{	256	{
231	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	257	MAGIC *mg = CORO_MAGIC (cv);
		258	AV *av;
232		259
233	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	260	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
234	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	261	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
235	else	262	else
236	{	263	{
237	#if 0	264	#if 0
238	/* this should work - but it doesn't :( */	265	/* this is probably cleaner, but also slower? */
239	CV *cp = Perl_cv_clone (aTHX_ cv);	266	CV *cp = Perl_cv_clone (cv);
240	CvPADLIST (cv) = CvPADLIST (cp);	267	CvPADLIST (cv) = CvPADLIST (cp);
241	CvPADLIST (cp) = 0;	268	CvPADLIST (cp) = 0;
242	SvREFCNT_dec (cp);	269	SvREFCNT_dec (cp);
243	#else	270	#else
244	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);	271	CvPADLIST (cv) = coro_clone_padlist (cv);
245	#endif	272	#endif
246	}	273	}
247	}	274	}
248		275
249	static void	276	static void
250	put_padlist (pTHX_ CV *cv)	277	put_padlist (CV *cv)
251	{	278	{
252	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	279	MAGIC *mg = CORO_MAGIC (cv);
		280	AV *av;
253		281
254	if (!mg)	282	if (!mg)
255	{	283	{
256	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	284	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
257	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	285	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
258	mg->mg_virtual = &vtbl_coro;	286	mg->mg_virtual = &vtbl_coro;
259	mg->mg_obj = (SV *)newAV ();	287	mg->mg_obj = (SV *)newAV ();
260	}	288	}
261		289
262	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);
263	}	296	}
264		297
265	#define SB do {	298	#define SB do {
266	#define SE } while (0)	299	#define SE } while (0)
267		300
268	#define LOAD(state) load_state(aTHX_ (state));
269	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
270
271	#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
272		302
273	static void	303	static void
274	load_state(pTHX_ Coro__State c)	304	load_perl (Coro__State c)
275	{	305	{
276	PL_dowarn = c->dowarn;	306	#define VAR(name,type) PL_ ## name = c->name;
277	PL_in_eval = c->in_eval;	307	# include "state.h"
278		308	#undef VAR
279	PL_curstackinfo = c->curstackinfo;
280	PL_curstack = c->curstack;
281	PL_mainstack = c->mainstack;
282	PL_stack_sp = c->stack_sp;
283	PL_op = c->op;
284	PL_curpad = c->curpad;
285	PL_comppad = c->comppad;
286	PL_compcv = c->compcv;
287	PL_stack_base = c->stack_base;
288	PL_stack_max = c->stack_max;
289	PL_tmps_stack = c->tmps_stack;
290	PL_tmps_floor = c->tmps_floor;
291	PL_tmps_ix = c->tmps_ix;
292	PL_tmps_max = c->tmps_max;
293	PL_markstack = c->markstack;
294	PL_markstack_ptr = c->markstack_ptr;
295	PL_markstack_max = c->markstack_max;
296	PL_scopestack = c->scopestack;
297	PL_scopestack_ix = c->scopestack_ix;
298	PL_scopestack_max = c->scopestack_max;
299	PL_savestack = c->savestack;
300	PL_savestack_ix = c->savestack_ix;
301	PL_savestack_max = c->savestack_max;
302	#if PERL_VERSION < 9
303	PL_retstack = c->retstack;
304	PL_retstack_ix = c->retstack_ix;
305	PL_retstack_max = c->retstack_max;
306	#endif
307	PL_curpm = c->curpm;
308	PL_curcop = c->curcop;
309		309
310	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	310	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
311	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	311	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
312	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	}
313		324
314	{	325	{
315	dSP;	326	dSP;
316	CV *cv;	327	CV *cv;
317		328
318	/* now do the ugly restore mess */	329	/* now do the ugly restore mess */
319	while ((cv = (CV *)POPs))	330	while ((cv = (CV *)POPs))
320	{	331	{
321	AV *padlist = (AV *)POPs;
322
323	if (padlist)
324	{
325	put_padlist (aTHX_ cv); /* mark this padlist as available */	332	put_padlist (cv); /* mark this padlist as available */
326	CvPADLIST(cv) = padlist;	333	CvDEPTH (cv) = PTR2IV (POPs);
327	}	334	CvPADLIST (cv) = (AV *)POPs;
328
329	++CvDEPTH(cv);
330	}	335	}
331		336
332	PUTBACK;	337	PUTBACK;
333	}	338	}
334	}	339	}
335		340
336	static void	341	static void
337	save_state(pTHX_ Coro__State c, int flags)	342	save_perl (Coro__State c)
338	{	343	{
339	{	344	{
340	dSP;	345	dSP;
341	I32 cxix = cxstack_ix;	346	I32 cxix = cxstack_ix;
342	PERL_CONTEXT *ccstk = cxstack;	347	PERL_CONTEXT *ccstk = cxstack;
…		…
353	{	358	{
354	while (cxix >= 0)	359	while (cxix >= 0)
355	{	360	{
356	PERL_CONTEXT *cx = &ccstk[cxix--];	361	PERL_CONTEXT *cx = &ccstk[cxix--];
357		362
358	if (CxTYPE(cx) == CXt_SUB)	363	if (CxTYPE (cx) == CXt_SUB)
359	{	364	{
360	CV *cv = cx->blk_sub.cv;	365	CV *cv = cx->blk_sub.cv;
		366
361	if (CvDEPTH(cv))	367	if (CvDEPTH (cv))
362	{	368	{
363	EXTEND (SP, CvDEPTH(cv)*2);	369	EXTEND (SP, 3);
364		370
365	while (--CvDEPTH(cv))
366	{
367	/* this tells the restore code to increment CvDEPTH */
368	PUSHs (Nullsv);
369	PUSHs ((SV *)cv);
370	}
371
372	PUSHs ((SV *)CvPADLIST(cv));	371	PUSHs ((SV *)CvPADLIST (cv));
		372	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
373	PUSHs ((SV *)cv);	373	PUSHs ((SV *)cv);
374		374
		375	CvDEPTH (cv) = 0;
375	get_padlist (aTHX_ cv);	376	get_padlist (cv);
376	}	377	}
377	}	378	}
378	#ifdef CXt_FORMAT	379	#ifdef CXt_FORMAT
379	else if (CxTYPE(cx) == CXt_FORMAT)	380	else if (CxTYPE (cx) == CXt_FORMAT)
380	{	381	{
381	/* 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? */
382	/* my bold guess is as a simple, plain sub... */	383	/* my bold guess is as a simple, plain sub... */
383	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");
384	}	385	}
…		…
394	}	395	}
395		396
396	PUTBACK;	397	PUTBACK;
397	}	398	}
398		399
399	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;
400	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	401	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
401	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;
402		404
403	c->dowarn = PL_dowarn;	405	#define VAR(name,type)c->name = PL_ ## name;
404	c->in_eval = PL_in_eval;	406	# include "state.h"
405		407	#undef VAR
406	c->curstackinfo = PL_curstackinfo;
407	c->curstack = PL_curstack;
408	c->mainstack = PL_mainstack;
409	c->stack_sp = PL_stack_sp;
410	c->op = PL_op;
411	c->curpad = PL_curpad;
412	c->comppad = PL_comppad;
413	c->compcv = PL_compcv;
414	c->stack_base = PL_stack_base;
415	c->stack_max = PL_stack_max;
416	c->tmps_stack = PL_tmps_stack;
417	c->tmps_floor = PL_tmps_floor;
418	c->tmps_ix = PL_tmps_ix;
419	c->tmps_max = PL_tmps_max;
420	c->markstack = PL_markstack;
421	c->markstack_ptr = PL_markstack_ptr;
422	c->markstack_max = PL_markstack_max;
423	c->scopestack = PL_scopestack;
424	c->scopestack_ix = PL_scopestack_ix;
425	c->scopestack_max = PL_scopestack_max;
426	c->savestack = PL_savestack;
427	c->savestack_ix = PL_savestack_ix;
428	c->savestack_max = PL_savestack_max;
429	#if PERL_VERSION < 9
430	c->retstack = PL_retstack;
431	c->retstack_ix = PL_retstack_ix;
432	c->retstack_max = PL_retstack_max;
433	#endif
434	c->curpm = PL_curpm;
435	c->curcop = PL_curcop;
436	}	408	}
437		409
438	/*	410	/*
439	* allocate various perl stacks. This is an exact copy	411	* allocate various perl stacks. This is an exact copy
440	* of perl.c:init_stacks, except that it uses less memory	412	* of perl.c:init_stacks, except that it uses less memory
441	* on the (sometimes correct) assumption that coroutines do	413	* on the (sometimes correct) assumption that coroutines do
442	* not usually need a lot of stackspace.	414	* not usually need a lot of stackspace.
443	*/	415	*/
444	static void	416	static void
445	coro_init_stacks (pTHX)	417	coro_init_stacks ()
446	{	418	{
447	LOCK;
448
449	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	419	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
450	PL_curstackinfo->si_type = PERLSI_MAIN;	420	PL_curstackinfo->si_type = PERLSI_MAIN;
451	PL_curstack = PL_curstackinfo->si_stack;	421	PL_curstack = PL_curstackinfo->si_stack;
452	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	422	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
453		423
454	PL_stack_base = AvARRAY(PL_curstack);	424	PL_stack_base = AvARRAY(PL_curstack);
455	PL_stack_sp = PL_stack_base;	425	PL_stack_sp = PL_stack_base;
456	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	426	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
457		427
458	New(50,PL_tmps_stack,96,SV*);	428	New(50,PL_tmps_stack,128,SV*);
459	PL_tmps_floor = -1;	429	PL_tmps_floor = -1;
460	PL_tmps_ix = -1;	430	PL_tmps_ix = -1;
461	PL_tmps_max = 96;	431	PL_tmps_max = 128;
462		432
463	New(54,PL_markstack,16,I32);	433	New(54,PL_markstack,32,I32);
464	PL_markstack_ptr = PL_markstack;	434	PL_markstack_ptr = PL_markstack;
465	PL_markstack_max = PL_markstack + 16;	435	PL_markstack_max = PL_markstack + 32;
466		436
467	#ifdef SET_MARK_OFFSET	437	#ifdef SET_MARK_OFFSET
468	SET_MARK_OFFSET;	438	SET_MARK_OFFSET;
469	#endif	439	#endif
470		440
471	New(54,PL_scopestack,16,I32);	441	New(54,PL_scopestack,32,I32);
472	PL_scopestack_ix = 0;	442	PL_scopestack_ix = 0;
473	PL_scopestack_max = 16;	443	PL_scopestack_max = 32;
474		444
475	New(54,PL_savestack,96,ANY);	445	New(54,PL_savestack,64,ANY);
476	PL_savestack_ix = 0;	446	PL_savestack_ix = 0;
477	PL_savestack_max = 96;	447	PL_savestack_max = 64;
478		448
479	#if PERL_VERSION < 9	449	#if !PERL_VERSION_ATLEAST (5,9,0)
480	New(54,PL_retstack,8,OP*);	450	New(54,PL_retstack,16,OP*);
481	PL_retstack_ix = 0;	451	PL_retstack_ix = 0;
482	PL_retstack_max = 8;	452	PL_retstack_max = 16;
483	#endif	453	#endif
484
485	UNLOCK;
486	}	454	}
487		455
488	/*	456	/*
489	* destroy the stacks, the callchain etc...	457	* destroy the stacks, the callchain etc...
490	*/	458	*/
491	static void	459	static void
492	destroy_stacks(pTHX)	460	coro_destroy_stacks ()
493	{	461	{
494	if (!IN_DESTRUCT)	462	if (!IN_DESTRUCT)
495	{	463	{
496	/* is this ugly, I ask? */	464	/* is this ugly, I ask? */
497	LEAVE_SCOPE (0);	465	LEAVE_SCOPE (0);
…		…
528		496
529	Safefree (PL_tmps_stack);	497	Safefree (PL_tmps_stack);
530	Safefree (PL_markstack);	498	Safefree (PL_markstack);
531	Safefree (PL_scopestack);	499	Safefree (PL_scopestack);
532	Safefree (PL_savestack);	500	Safefree (PL_savestack);
533	#if PERL_VERSION < 9	501	#if !PERL_VERSION_ATLEAST (5,9,0)
534	Safefree (PL_retstack);	502	Safefree (PL_retstack);
535	#endif	503	#endif
536	}	504	}
537		505
538	static void	506	static void
539	setup_coro (struct coro *coro)	507	setup_coro (struct coro *coro)
540	{	508	{
541	/*	509	/*
542	* emulate part of the perl startup here.	510	* emulate part of the perl startup here.
543	*/	511	*/
544	dTHX;
545	dSP;
546	UNOP myop;
547	SV *sub_init = (SV *)get_cv ("Coro::State::coro_init", FALSE);
548		512
549	coro_init_stacks (aTHX);	513	coro_init_stacks ();
550	/*PL_curcop = 0;*/	514
551	/*PL_in_eval = PL_in_eval;*/ /* inherit */	515	PL_curcop = &PL_compiling;
		516	PL_in_eval = EVAL_NULL;
		517	PL_curpm = 0;
		518	PL_localizing = 0;
		519	PL_dirty = 0;
		520	PL_restartop = 0;
		521
		522	{
		523	dSP;
		524	LOGOP myop;
		525
552	SvREFCNT_dec (GvAV (PL_defgv));	526	SvREFCNT_dec (GvAV (PL_defgv));
553	GvAV (PL_defgv) = coro->args; coro->args = 0;	527	GvAV (PL_defgv) = coro->args; coro->args = 0;
554		528
555	SPAGAIN;
556
557	Zero (&myop, 1, UNOP);	529	Zero (&myop, 1, LOGOP);
558	myop.op_next = Nullop;	530	myop.op_next = Nullop;
559	myop.op_flags = OPf_WANT_VOID;	531	myop.op_flags = OPf_WANT_VOID;
560		532
		533	PUSHMARK (SP);
		534	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		535	PUTBACK;
561	PL_op = (OP *)&myop;	536	PL_op = (OP *)&myop;
562
563	PUSHMARK(SP);
564	XPUSHs (sub_init);
565	PUTBACK;
566	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);	537	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
567	SPAGAIN;	538	SPAGAIN;
		539	}
568		540
569	ENTER; /* necessary e.g. for dounwind */	541	ENTER; /* necessary e.g. for dounwind */
570	}	542	}
571		543
572	static void	544	static void
…		…
577	SvREFCNT_dec (coro_mortal);	549	SvREFCNT_dec (coro_mortal);
578	coro_mortal = 0;	550	coro_mortal = 0;
579	}	551	}
580	}	552	}
581		553
		554	/* inject a fake call to Coro::State::_cctx_init into the execution */
		555	static void NOINLINE
		556	prepare_cctx (coro_cctx *cctx)
		557	{
		558	dSP;
		559	LOGOP myop;
		560
		561	Zero (&myop, 1, LOGOP);
		562	myop.op_next = PL_op;
		563	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		564
		565	PUSHMARK (SP);
		566	EXTEND (SP, 2);
		567	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		568	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		569	PUTBACK;
		570	PL_op = (OP *)&myop;
		571	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		572	SPAGAIN;
		573	}
		574
582	static void	575	static void
583	coro_run (void *arg)	576	coro_run (void *arg)
584	{	577	{
		578	/* coro_run is the alternative tail of transfer(), so unlock here. */
		579	UNLOCK;
		580
585	/*	581	/*
586	* this is a _very_ stripped down perl interpreter ;)	582	* this is a _very_ stripped down perl interpreter ;)
587	*/	583	*/
588	dTHX;
589	PL_top_env = &PL_start_env;	584	PL_top_env = &PL_start_env;
590		585
591	UNLOCK;	586	/* inject call to cctx_init */
		587	prepare_cctx ((coro_cctx *)arg);
592		588
593	sv_setiv (get_sv ("Coro::State::cctx_stack", FALSE), PTR2IV ((coro_stack *)arg));
594	sv_setiv (get_sv ("Coro::State::cctx_restartop", FALSE), PTR2IV (PL_op));
595	PL_restartop = CvSTART (get_cv ("Coro::State::cctx_init", FALSE));
596
597	/* somebody will hit me for both perl_run and PL_restart_op */	589	/* somebody will hit me for both perl_run and PL_restartop */
598	perl_run (aTHX_ PERL_GET_CONTEXT);	590	PL_restartop = PL_op;
		591	perl_run (PL_curinterp);
599		592
		593	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
600	abort ();	594	abort ();
601	}	595	}
602		596
603	static coro_stack *	597	static coro_cctx *
604	stack_new ()	598	cctx_new ()
605	{	599	{
606	coro_stack *stack;	600	coro_cctx *cctx;
607		601
		602	++cctx_count;
		603
608	New (0, stack, 1, coro_stack);	604	Newz (0, cctx, 1, coro_cctx);
609		605
610	#if HAVE_MMAP	606	#if HAVE_MMAP
611		607
612	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE; /* mmap should do allocate-on-write for us */	608	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		609	/* mmap supposedly does allocate-on-write for us */
613	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);	610	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
614		611
615	if (stack->sptr == (void *)-1)	612	if (cctx->sptr == (void *)-1)
616	{	613	{
617	perror ("FATAL: unable to mmap stack for coroutine");	614	perror ("FATAL: unable to mmap stack for coroutine");
618	_exit (EXIT_FAILURE);	615	_exit (EXIT_FAILURE);
619	}	616	}
620		617
		618	# if STACKGUARD
621	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);	619	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		620	# endif
622		621
623	#else	622	#else
624		623
625	stack->ssize = STACKSIZE * (long)sizeof (long);	624	cctx->ssize = STACKSIZE * (long)sizeof (long);
626	New (0, stack->sptr, STACKSIZE, long);	625	New (0, cctx->sptr, STACKSIZE, long);
627		626
628	if (!stack->sptr)	627	if (!cctx->sptr)
629	{	628	{
630	perror (stderr, "FATAL: unable to malloc stack for coroutine");	629	perror ("FATAL: unable to malloc stack for coroutine");
631	_exit (EXIT_FAILURE);	630	_exit (EXIT_FAILURE);
632	}	631	}
633		632
634	#endif	633	#endif
635		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
636	coro_create (&stack->cctx, coro_run, (void *)stack, stack->sptr, stack->ssize);	642	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
637		643
638	return stack;	644	return cctx;
639	}	645	}
640		646
641	static void	647	static void
642	stack_free (coro_stack *stack)	648	cctx_destroy (coro_cctx *cctx)
643	{	649	{
644	if (!stack || stack == main_stack)	650	if (!cctx)
645	return;	651	return;
646		652
		653	--cctx_count;
		654
		655	#if USE_VALGRIND
		656	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		657	#endif
		658
647	#if HAVE_MMAP	659	#if HAVE_MMAP
648	munmap (stack->sptr, stack->ssize);	660	munmap (cctx->sptr, cctx->ssize);
649	#else	661	#else
650	Safefree (stack->sptr);	662	Safefree (cctx->sptr);
651	#endif	663	#endif
652		664
653	Safefree (stack);	665	Safefree (cctx);
654	}	666	}
655		667
656	static coro_stack *stack_first;
657
658	static coro_stack *	668	static coro_cctx *
659	stack_get ()	669	cctx_get ()
660	{	670	{
661	coro_stack *stack;	671	coro_cctx *cctx;
662		672
663	if (stack_first)	673	if (cctx_first)
664	{	674	{
665	stack = stack_first;	675	cctx = cctx_first;
666	stack_first = stack->next;	676	cctx_first = cctx->next;
		677	--cctx_idle;
667	}	678	}
668	else	679	else
669	{	680	{
670	stack = stack_new ();	681	cctx = cctx_new ();
671	PL_op = PL_op->op_next;	682	PL_op = PL_op->op_next;
672	}	683	}
673		684
674	return stack;	685	return cctx;
675	}	686	}
676		687
677	static void	688	static void
678	stack_put (coro_stack *stack)	689	cctx_put (coro_cctx *cctx)
679	{	690	{
680	stack->next = stack_first;	691	/* free another cctx if overlimit */
681	stack_first = stack;	692	if (cctx_idle >= MAX_IDLE_CCTX)
		693	{
		694	coro_cctx *first = cctx_first;
		695	cctx_first = first->next;
		696	--cctx_idle;
		697
		698	assert (!first->inuse);
		699	cctx_destroy (first);
		700	}
		701
		702	++cctx_idle;
		703	cctx->next = cctx_first;
		704	cctx_first = cctx;
682	}	705	}
683		706
684	/* never call directly, always through the coro_state_transfer global variable */	707	/* never call directly, always through the coro_state_transfer global variable */
685	static void	708	static void NOINLINE
686	transfer_impl (pTHX_ struct coro *prev, struct coro *next, int flags)	709	transfer (struct coro *prev, struct coro *next)
687	{	710	{
688	dSTACKLEVEL;	711	dSTACKLEVEL;
689		712
690	/* sometimes transfer is only called to set idle_sp */	713	/* sometimes transfer is only called to set idle_sp */
691	if (flags == TRANSFER_SET_STACKLEVEL)	714	if (!next)
		715	{
692	((coro_stack *)prev)->idle_sp = STACKLEVEL;	716	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		717	assert (((coro_cctx *)prev)->top_env = PL_top_env); /* just for the side effetc when assert is enabled */
		718	}
693	else if (prev != next)	719	else if (prev != next)
694	{	720	{
695	coro_stack *prev__stack;	721	coro_cctx *prev__cctx;
		722
		723	if (prev->flags & CF_NEW)
		724	{
		725	/* create a new empty context */
		726	Newz (0, prev->cctx, 1, coro_cctx);
		727	prev->cctx->inuse = 1;
		728	prev->flags &= ~CF_NEW;
		729	prev->flags |= CF_RUNNING;
		730	}
		731
		732	/*TODO: must not croak here */
		733	if (!prev->flags & CF_RUNNING)
		734	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		735
		736	if (next->flags & CF_RUNNING)
		737	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		738
		739	prev->flags &= ~CF_RUNNING;
		740	next->flags |= CF_RUNNING;
696		741
697	LOCK;	742	LOCK;
698		743
699	if (next->mainstack)	744	if (next->flags & CF_NEW)
700	{	745	{
701	/* coroutine already started */	746	/* need to start coroutine */
702	SAVE (prev, flags);	747	next->flags &= ~CF_NEW;
703	LOAD (next);	748	/* first get rid of the old state */
		749	save_perl (prev);
		750	/* setup coroutine call */
		751	setup_coro (next);
		752	/* need a new stack */
		753	assert (!next->cctx);
704	}	754	}
705	else	755	else
706	{	756	{
707	/* need to start coroutine */	757	/* coroutine already started */
708	/* first get rid of the old state */	758	save_perl (prev);
709	SAVE (prev, -1);	759	load_perl (next);
710	/* setup coroutine call */
711	setup_coro (next);
712	/* need a stack */
713	next->stack = 0;
714	}	760	}
715		761
716	prev__stack = prev->stack;	762	prev__cctx = prev->cctx;
717		763
718	/* possibly "free" the stack */	764	/* possibly "free" the cctx */
719	if (prev__stack->idle_sp == STACKLEVEL)	765	if (prev__cctx->idle_sp == STACKLEVEL)
720	{	766	{
721	stack_put (prev__stack);	767	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		768	assert (PL_top_env == prev__cctx->top_env);
		769
722	prev->stack = 0;	770	prev->cctx = 0;
		771
		772	cctx_put (prev__cctx);
		773	prev__cctx->inuse = 0;
723	}	774	}
724		775
725	if (!next->stack)	776	if (!next->cctx)
726	next->stack = stack_get ();
727
728	if (prev__stack != next->stack)
729	{	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	{
730	prev__stack->top_env = PL_top_env;	785	prev__cctx->top_env = PL_top_env;
731	PL_top_env = next->stack->top_env;	786	PL_top_env = next->cctx->top_env;
732	coro_transfer (&prev__stack->cctx, &next->stack->cctx);	787	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
733	}	788	}
734		789
735	free_coro_mortal ();	790	free_coro_mortal ();
736		791
737	UNLOCK;	792	UNLOCK;
738	}	793	}
739	}	794	}
740		795
741	/* use this function pointer to call the above function */
742	/* this is done to increase chances of the compiler not inlining the call */
743	/* not static to make it even harder for the compiler (and theoretically impossible in most cases */
744	void (*coro_state_transfer)(pTHX_ struct coro *prev, struct coro *next, int flags) = transfer_impl;
745
746	struct transfer_args	796	struct transfer_args
747	{	797	{
748	struct coro *prev, *next;	798	struct coro *prev, *next;
749	int flags;
750	};	799	};
751		800
752	#define TRANSFER(ta) coro_state_transfer ((ta).prev, (ta).next, (ta).flags)	801	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
753		802
754	static void	803	static void
755	coro_state_destroy (struct coro *coro)	804	coro_state_destroy (struct coro *coro)
756	{	805	{
757	if (coro->refcnt--)	806	if (coro->refcnt--)
758	return;	807	return;
759		808
760	if (coro->mainstack && coro->mainstack != main_mainstack)	809	if (coro->mainstack && coro->mainstack != main_mainstack)
761	{	810	{
762	struct coro temp;	811	struct coro temp;
		812	Zero (&temp, 1, struct coro);
		813	temp.save = CORO_SAVE_ALL;
763		814
764	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);	815	if (coro->flags & CF_RUNNING)
765	LOAD (aTHX_ coro);	816	croak ("FATAL: tried to destroy currently running coroutine");
766		817
		818	save_perl (&temp);
		819	load_perl (coro);
		820
767	destroy_stacks (aTHX);	821	coro_destroy_stacks ();
768		822
769	LOAD ((&temp)); /* this will get rid of defsv etc.. */	823	load_perl (&temp); /* this will get rid of defsv etc.. */
770		824
771	coro->mainstack = 0;	825	coro->mainstack = 0;
772	}	826	}
773		827
774	stack_free (coro->stack);	828	cctx_destroy (coro->cctx);
775	SvREFCNT_dec (coro->args);	829	SvREFCNT_dec (coro->args);
776	Safefree (coro);	830	Safefree (coro);
777	}	831	}
778		832
779	static int	833	static int
780	coro_state_clear (SV *sv, MAGIC *mg)	834	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
781	{	835	{
782	struct coro *coro = (struct coro *)mg->mg_ptr;	836	struct coro *coro = (struct coro *)mg->mg_ptr;
783	mg->mg_ptr = 0;	837	mg->mg_ptr = 0;
784		838
785	coro_state_destroy (coro);	839	coro_state_destroy (coro);
786		840
787	return 0;	841	return 0;
788	}	842	}
789		843
790	static int	844	static int
791	coro_state_dup (MAGIC *mg, CLONE_PARAMS *params)	845	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
792	{	846	{
793	struct coro *coro = (struct coro *)mg->mg_ptr;	847	struct coro *coro = (struct coro *)mg->mg_ptr;
794		848
795	++coro->refcnt;	849	++coro->refcnt;
796		850
797	return 0;	851	return 0;
798	}	852	}
799		853
800	static MGVTBL coro_state_vtbl = { 0, 0, 0, 0, coro_state_clear, 0, coro_state_dup, 0 };	854	static MGVTBL coro_state_vtbl = {
		855	0, 0, 0, 0,
		856	coro_state_clear,
		857	0,
		858	#ifdef MGf_DUP
		859	coro_state_dup,
		860	#else
		861	# define MGf_DUP 0
		862	#endif
		863	};
801		864
802	static struct coro *	865	static struct coro *
803	SvSTATE (SV *coro)	866	SvSTATE (SV *coro)
804	{	867	{
805	HV *stash;	868	HV *stash;
…		…
820	assert (mg->mg_type == PERL_MAGIC_ext);	883	assert (mg->mg_type == PERL_MAGIC_ext);
821	return (struct coro *)mg->mg_ptr;	884	return (struct coro *)mg->mg_ptr;
822	}	885	}
823		886
824	static void	887	static void
825	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev, SV *next, int flags)	888	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
826	{	889	{
827	ta->prev = SvSTATE (prev);	890	ta->prev = SvSTATE (prev_sv);
828	ta->next = SvSTATE (next);	891	ta->next = SvSTATE (next_sv);
829	ta->flags = flags;
830	}	892	}
831		893
832	static void	894	static void
833	api_transfer (SV *prev, SV *next, int flags)	895	api_transfer (SV *prev_sv, SV *next_sv)
834	{	896	{
835	dTHX;
836	struct transfer_args ta;	897	struct transfer_args ta;
837		898
838	prepare_transfer (aTHX_ &ta, prev, next, flags);	899	prepare_transfer (&ta, prev_sv, next_sv);
839	TRANSFER (ta);	900	TRANSFER (ta);
		901	}
		902
		903	static int
		904	api_save (SV *coro_sv, int new_save)
		905	{
		906	struct coro *coro = SvSTATE (coro_sv);
		907	int old_save = coro->save;
		908
		909	if (new_save >= 0)
		910	coro->save = new_save;
		911
		912	return old_save;
840	}	913	}
841		914
842	/** Coro ********************************************************************/	915	/** Coro ********************************************************************/
843		916
844	#define PRIO_MAX 3	917	#define PRIO_MAX 3
…		…
847	#define PRIO_LOW -1	920	#define PRIO_LOW -1
848	#define PRIO_IDLE -3	921	#define PRIO_IDLE -3
849	#define PRIO_MIN -4	922	#define PRIO_MIN -4
850		923
851	/* for Coro.pm */	924	/* for Coro.pm */
852	static GV *coro_current, *coro_idle;	925	static SV *coro_current;
853	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];	926	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
854	static int coro_nready;	927	static int coro_nready;
855		928
856	static void	929	static void
857	coro_enq (pTHX_ SV *sv)	930	coro_enq (SV *coro_sv)
858	{	931	{
859	int prio;
860
861	if (SvTYPE (sv) != SVt_PVHV)
862	croak ("Coro::ready tried to enqueue something that is not a coroutine");
863
864	prio = SvSTATE (sv)->prio;
865
866	av_push (coro_ready [prio - PRIO_MIN], sv);	932	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
867	coro_nready++;	933	coro_nready++;
868	}	934	}
869		935
870	static SV *	936	static SV *
871	coro_deq (pTHX_ int min_prio)	937	coro_deq (int min_prio)
872	{	938	{
873	int prio = PRIO_MAX - PRIO_MIN;	939	int prio = PRIO_MAX - PRIO_MIN;
874		940
875	min_prio -= PRIO_MIN;	941	min_prio -= PRIO_MIN;
876	if (min_prio < 0)	942	if (min_prio < 0)
…		…
884	}	950	}
885		951
886	return 0;	952	return 0;
887	}	953	}
888		954
889	static void	955	static int
890	api_ready (SV *coro)	956	api_ready (SV *coro_sv)
891	{	957	{
892	dTHX;	958	struct coro *coro;
893		959
894	if (SvROK (coro))	960	if (SvROK (coro_sv))
895	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;
896		974
897	LOCK;	975	LOCK;
898	coro_enq (aTHX_ SvREFCNT_inc (coro));	976	coro_enq (SvREFCNT_inc (coro_sv));
899	UNLOCK;	977	UNLOCK;
900	}
901		978
		979	return 1;
		980	}
		981
902	static void	982	static int
		983	api_is_ready (SV *coro_sv)
		984	{
		985	return !!SvSTATE (coro_sv)->flags & CF_READY;
		986	}
		987
		988	static void
903	prepare_schedule (aTHX_ struct transfer_args *ta)	989	prepare_schedule (struct transfer_args *ta)
904	{	990	{
905	SV *current, *prev, *next;	991	SV *prev, *next;
906
907	LOCK;
908
909	current = GvSV (coro_current);
910		992
911	for (;;)	993	for (;;)
912	{	994	{
913	LOCK;	995	LOCK;
914
915	next = coro_deq (aTHX_ PRIO_MIN);	996	next = coro_deq (PRIO_MIN);
		997	UNLOCK;
916		998
917	if (next)	999	if (next)
918	break;	1000	break;
919		1001
920	UNLOCK;
921
922	{	1002	{
923	dSP;	1003	dSP;
924		1004
925	ENTER;	1005	ENTER;
926	SAVETMPS;	1006	SAVETMPS;
927		1007
928	PUSHMARK (SP);	1008	PUSHMARK (SP);
929	PUTBACK;	1009	PUTBACK;
930	call_sv (GvSV (coro_idle), G_DISCARD);	1010	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
931		1011
932	FREETMPS;	1012	FREETMPS;
933	LEAVE;	1013	LEAVE;
934	}	1014	}
935	}	1015	}
936		1016
937	prev = SvRV (current);	1017	prev = SvRV (coro_current);
938	SvRV (current) = next;	1018	SvRV_set (coro_current, next);
939		1019
940	/* free this only after the transfer */	1020	/* free this only after the transfer */
		1021	LOCK;
941	free_coro_mortal ();	1022	free_coro_mortal ();
		1023	UNLOCK;
942	coro_mortal = prev;	1024	coro_mortal = prev;
943		1025
		1026	assert (!SvROK(prev));//D
		1027	assert (!SvROK(next));//D
		1028
944	ta->prev = SvSTATE (prev);	1029	ta->prev = SvSTATE (prev);
945	ta->next = SvSTATE (next);	1030	ta->next = SvSTATE (next);
946	ta->flags = TRANSFER_SAVE_ALL;
947		1031
948	UNLOCK;	1032	assert (ta->next->flags & CF_READY);
		1033	ta->next->flags &= ~CF_READY;
949	}	1034	}
950		1035
951	static void	1036	static void
952	prepare_cede (aTHX_ struct transfer_args *ta)	1037	prepare_cede (struct transfer_args *ta)
953	{	1038	{
954	LOCK;	1039	api_ready (coro_current);
955	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));
956	UNLOCK;
957		1040
958	prepare_schedule (ta);	1041	prepare_schedule (ta);
959	}	1042	}
960		1043
961	static void	1044	static void
962	api_schedule (void)	1045	api_schedule (void)
963	{	1046	{
964	dTHX;
965	struct transfer_args ta;	1047	struct transfer_args ta;
966		1048
967	prepare_schedule (&ta);	1049	prepare_schedule (&ta);
968	TRANSFER (ta);	1050	TRANSFER (ta);
969	}	1051	}
970		1052
971	static void	1053	static void
972	api_cede (void)	1054	api_cede (void)
973	{	1055	{
974	dTHX;
975	struct transfer_args ta;	1056	struct transfer_args ta;
976		1057
977	prepare_cede (&ta);	1058	prepare_cede (&ta);
978	TRANSFER (ta);	1059	TRANSFER (ta);
979	}	1060	}
…		…
989	#endif	1070	#endif
990	BOOT_PAGESIZE;	1071	BOOT_PAGESIZE;
991		1072
992	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1073	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
993		1074
994	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1075	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
995	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1076	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
996	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1077	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1078	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
		1079	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
997		1080
998	main_mainstack = PL_mainstack;	1081	main_mainstack = PL_mainstack;
999		1082
1000	coroapi.ver = CORO_API_VERSION;	1083	coroapi.ver = CORO_API_VERSION;
1001	coroapi.transfer = api_transfer;	1084	coroapi.transfer = api_transfer;
1002
1003	Newz (0, main_stack, 1, coro_stack);
1004	main_stack->idle_sp = (void *)-1;
1005		1085
1006	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));	1086	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
1007	}	1087	}
1008		1088
1009	SV *	1089	SV *
…		…
1014	HV *hv;	1094	HV *hv;
1015	int i;	1095	int i;
1016		1096
1017	Newz (0, coro, 1, struct coro);	1097	Newz (0, coro, 1, struct coro);
1018	coro->args = newAV ();	1098	coro->args = newAV ();
		1099	coro->save = CORO_SAVE_ALL;
		1100	coro->flags = CF_NEW;
1019		1101
1020	hv = newHV ();	1102	hv = newHV ();
1021	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;	1103	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
1022	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));	1104	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
1023		1105
1024	for (i = 1; i < items; i++)	1106	for (i = 1; i < items; i++)
1025	av_push (coro->args, newSVsv (ST (i)));	1107	av_push (coro->args, newSVsv (ST (i)));
1026
1027	coro->stack = main_stack;
1028	/*coro->mainstack = 0; *//*actual work is done inside transfer */
1029	/*coro->stack = 0;*/
1030	}	1108	}
1031	OUTPUT:	1109	OUTPUT:
1032	RETVAL	1110	RETVAL
1033		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
1034	void	1119	void
1035	transfer (...)	1120	_set_stacklevel (...)
1036	ALIAS:	1121	ALIAS:
1037	Coro::schedule = 1	1122	Coro::State::transfer = 1
1038	Coro::cede = 2	1123	Coro::schedule = 2
1039	_set_stacklevel = 3	1124	Coro::cede = 3
1040	CODE:	1125	CODE:
1041	{	1126	{
1042	struct transfer_args ta;	1127	struct transfer_args ta;
1043		1128
1044	switch (ix)	1129	switch (ix)
1045	{	1130	{
1046	case 0:	1131	case 0:
1047	if (items != 3)	1132	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
1048	croak ("Coro::State::transfer(prev,next,flags) expects three arguments, not %d", items);	1133	ta.next = 0;
1049
1050	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
1051	break;	1134	break;
1052		1135
1053	case 1:	1136	case 1:
		1137	if (items != 2)
		1138	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1139
		1140	prepare_transfer (&ta, ST (0), ST (1));
		1141	break;
		1142
		1143	case 2:
1054	prepare_schedule (&ta);	1144	prepare_schedule (&ta);
1055	break;	1145	break;
1056		1146
1057	case 2:	1147	case 3:
1058	prepare_cede (&ta);	1148	prepare_cede (&ta);
1059	break;
1060
1061	case 3:
1062	ta.prev = (struct coro *)INT2PTR (coro_stack *, SvIV (ST (0)));
1063	ta.next = 0;
1064	ta.flags = TRANSFER_SET_STACKLEVEL;
1065	break;	1149	break;
1066	}	1150	}
1067		1151
1068	TRANSFER (ta);	1152	TRANSFER (ta);
1069	}	1153	}
…		…
1077	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);	1161	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
1078		1162
1079	++coro_src->refcnt;	1163	++coro_src->refcnt;
1080	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;	1164	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
1081	}	1165	}
1082
1083	void
1084	_nonlocal_goto (IV nextop)
1085	CODE:
1086	/* uuh, somebody will kill me again for this */
1087	PL_op->op_next = INT2PTR (OP *, nextop);
1088		1166
1089	void	1167	void
1090	_exit (code)	1168	_exit (code)
1091	int code	1169	int code
1092	PROTOTYPE: $	1170	PROTOTYPE: $
1093	CODE:	1171	CODE:
1094	_exit (code);	1172	_exit (code);
1095		1173
1096	MODULE = Coro::State PACKAGE = Coro::Cont	1174	int
		1175	cctx_count ()
		1176	CODE:
		1177	RETVAL = cctx_count;
		1178	OUTPUT:
		1179	RETVAL
1097		1180
1098	void	1181	int
1099	yield (...)	1182	cctx_idle ()
1100	PROTOTYPE: @	1183	CODE:
1101	CODE:	1184	RETVAL = cctx_idle;
1102	{	1185	OUTPUT:
1103	SV *yieldstack;	1186	RETVAL
1104	SV *sv;
1105	AV *defav = GvAV (PL_defgv);
1106	struct coro *prev, *next;
1107
1108	yieldstack = *hv_fetch (
1109	(HV *)SvRV (GvSV (coro_current)),
1110	"yieldstack", sizeof ("yieldstack") - 1,
1111	0
1112	);
1113
1114	/* set up @_ -- ugly */
1115	av_clear (defav);
1116	av_fill (defav, items - 1);
1117	while (items--)
1118	av_store (defav, items, SvREFCNT_inc (ST(items)));
1119
1120	sv = av_pop ((AV *)SvRV (yieldstack));
1121	prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
1122	next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
1123	SvREFCNT_dec (sv);
1124
1125	coro_state_transfer (aTHX_ prev, next, 0);
1126	}
1127		1187
1128	MODULE = Coro::State PACKAGE = Coro	1188	MODULE = Coro::State PACKAGE = Coro
1129		1189
1130	BOOT:	1190	BOOT:
1131	{	1191	{
…		…
1138	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1198	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1139	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));	1199	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1140	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1200	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1141	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));	1201	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1142		1202
1143	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);	1203	coro_current = get_sv ("Coro::current", FALSE);
1144	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);	1204	SvREADONLY_on (coro_current);
1145		1205
1146	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1206	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1147	coro_ready[i] = newAV ();	1207	coro_ready[i] = newAV ();
1148		1208
1149	{	1209	{
1150	SV *sv = perl_get_sv("Coro::API", 1);	1210	SV *sv = perl_get_sv("Coro::API", 1);
1151		1211
1152	coroapi.schedule = api_schedule;	1212	coroapi.schedule = api_schedule;
		1213	coroapi.save = api_save;
1153	coroapi.cede = api_cede;	1214	coroapi.cede = api_cede;
1154	coroapi.ready = api_ready;	1215	coroapi.ready = api_ready;
		1216	coroapi.is_ready = api_is_ready;
1155	coroapi.nready = &coro_nready;	1217	coroapi.nready = &coro_nready;
1156	coroapi.current = coro_current;	1218	coroapi.current = coro_current;
1157		1219
1158	GCoroAPI = &coroapi;	1220	GCoroAPI = &coroapi;
1159	sv_setiv (sv, (IV)&coroapi);	1221	sv_setiv (sv, (IV)&coroapi);
1160	SvREADONLY_on (sv);	1222	SvREADONLY_on (sv);
1161	}	1223	}
1162	}	1224	}
		1225
		1226	void
		1227	_set_current (SV *current)
		1228	PROTOTYPE: $
		1229	CODE:
		1230	SvREFCNT_dec (SvRV (coro_current));
		1231	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1163		1232
1164	int	1233	int
1165	prio (Coro::State coro, int newprio = 0)	1234	prio (Coro::State coro, int newprio = 0)
1166	ALIAS:	1235	ALIAS:
1167	nice = 1	1236	nice = 1
…		…
1179		1248
1180	coro->prio = newprio;	1249	coro->prio = newprio;
1181	}	1250	}
1182	}	1251	}
1183		1252
1184	void	1253	SV *
1185	ready (SV *self)	1254	ready (SV *self)
1186	PROTOTYPE: $	1255	PROTOTYPE: $
1187	CODE:	1256	CODE:
1188	api_ready (self);	1257	RETVAL = boolSV (api_ready (self));
		1258	OUTPUT:
		1259	RETVAL
		1260
		1261	SV *
		1262	is_ready (SV *self)
		1263	PROTOTYPE: $
		1264	CODE:
		1265	RETVAL = boolSV (api_is_ready (self));
		1266	OUTPUT:
		1267	RETVAL
1189		1268
1190	int	1269	int
1191	nready (...)	1270	nready (...)
1192	PROTOTYPE:	1271	PROTOTYPE:
1193	CODE:	1272	CODE:
…		…
1199		1278
1200	SV *	1279	SV *
1201	_get_state ()	1280	_get_state ()
1202	CODE:	1281	CODE:
1203	{	1282	{
1204	struct {	1283	struct io_state *data;
1205	int errorno;
1206	int laststype;
1207	int laststatval;
1208	Stat_t statcache;
1209	} data;
1210		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
1211	data.errorno = errno;	1290	data->errorno = errno;
1212	data.laststype = PL_laststype;	1291	data->laststype = PL_laststype;
1213	data.laststatval = PL_laststatval;	1292	data->laststatval = PL_laststatval;
1214	data.statcache = PL_statcache;	1293	data->statcache = PL_statcache;
1215
1216	RETVAL = newSVpvn ((char *)&data, sizeof data);
1217	}	1294	}
1218	OUTPUT:	1295	OUTPUT:
1219	RETVAL	1296	RETVAL
1220		1297
1221	void	1298	void
1222	_set_state (char *data_)	1299	_set_state (char *data_)
1223	PROTOTYPE: $	1300	PROTOTYPE: $
1224	CODE:	1301	CODE:
1225	{	1302	{
1226	struct {	1303	struct io_state *data = (void *)data_;
1227	int errorno;
1228	int laststype;
1229	int laststatval;
1230	Stat_t statcache;
1231	} *data = (void *)data_;
1232		1304
1233	errno = data->errorno;	1305	errno = data->errorno;
1234	PL_laststype = data->laststype;	1306	PL_laststype = data->laststype;
1235	PL_laststatval = data->laststatval;	1307	PL_laststatval = data->laststatval;
1236	PL_statcache = data->statcache;	1308	PL_statcache = data->statcache;
1237	}	1309	}
		1310

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