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/cvs/Coro/Coro/State.xs

Comparing Coro/Coro/State.xs (file contents):
Revision 1.85 by root, Fri Nov 24 00:32:04 2006 UTC vs.
Revision 1.198 by root, Sun Oct 7 03:58:37 2007 UTC

		1	#include "libcoro/coro.c"
		2
1	#define PERL_NO_GET_CONTEXT	3	#define PERL_NO_GET_CONTEXT
2		4	#define PERL_EXT
3	#include "libcoro/coro.c"
4		5
5	#include "EXTERN.h"	6	#include "EXTERN.h"
6	#include "perl.h"	7	#include "perl.h"
7	#include "XSUB.h"	8	#include "XSUB.h"
8		9
9	#include "patchlevel.h"	10	#include "patchlevel.h"
10		11
11	#if PERL_VERSION < 6	12	#include <stdio.h>
		13	#include <errno.h>
		14	#include <assert.h>
		15
		16	#ifdef HAVE_MMAP
		17	# include <unistd.h>
		18	# include <sys/mman.h>
		19	# ifndef MAP_ANONYMOUS
		20	# ifdef MAP_ANON
		21	# define MAP_ANONYMOUS MAP_ANON
		22	# else
		23	# undef HAVE_MMAP
		24	# endif
		25	# endif
		26	# include <limits.h>
		27	# ifndef PAGESIZE
		28	# define PAGESIZE pagesize
		29	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		30	static long pagesize;
		31	# else
		32	# define BOOT_PAGESIZE (void)0
		33	# endif
		34	#else
		35	# define PAGESIZE 0
		36	# define BOOT_PAGESIZE (void)0
		37	#endif
		38
		39	#if CORO_USE_VALGRIND
		40	# include <valgrind/valgrind.h>
		41	# define REGISTER_STACK(cctx,start,end) (cctx)->valgrind_id = VALGRIND_STACK_REGISTER ((start), (end))
		42	#else
		43	# define REGISTER_STACK(cctx,start,end)
		44	#endif
		45
		46	/* the maximum number of idle cctx that will be pooled */
		47	#define MAX_IDLE_CCTX 8
		48
		49	#define PERL_VERSION_ATLEAST(a,b,c) \
		50	(PERL_REVISION > (a) \
		51	|| (PERL_REVISION == (a) \
		52	&& (PERL_VERSION > (b) \
		53	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		54
		55	#if !PERL_VERSION_ATLEAST (5,6,0)
12	# ifndef PL_ppaddr	56	# ifndef PL_ppaddr
13	# define PL_ppaddr ppaddr	57	# define PL_ppaddr ppaddr
14	# endif	58	# endif
15	# ifndef call_sv	59	# ifndef call_sv
16	# define call_sv perl_call_sv	60	# define call_sv perl_call_sv
…		…
27	# ifndef IS_PADCONST	71	# ifndef IS_PADCONST
28	# define IS_PADCONST(v) 0	72	# define IS_PADCONST(v) 0
29	# endif	73	# endif
30	#endif	74	#endif
31		75
32	#include <errno.h>	76	/* 5.8.7 */
		77	#ifndef SvRV_set
		78	# define SvRV_set(s,v) SvRV(s) = (v)
		79	#endif
		80
		81	/* 5.8.8 */
		82	#ifndef GV_NOTQUAL
		83	# define GV_NOTQUAL 0
		84	#endif
		85	#ifndef newSV
		86	# define newSV(l) NEWSV(0,l)
		87	#endif
33		88
34	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64	89	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
35	# undef STACKGUARD	90	# undef CORO_STACKGUARD
36	#endif
37
38	#ifndef STACKGUARD
39	# define STACKGUARD 0
40	#endif
41
42	#ifdef HAVE_MMAP
43	# include <unistd.h>
44	# include <sys/mman.h>
45	# ifndef MAP_ANONYMOUS
46	# ifdef MAP_ANON
47	# define MAP_ANONYMOUS MAP_ANON
48	# else
49	# undef HAVE_MMAP
50	# endif
51	# endif	91	#endif
52	# include <limits.h>	92
53	# ifndef PAGESIZE	93	#ifndef CORO_STACKGUARD
54	# define PAGESIZE pagesize	94	# define CORO_STACKGUARD 0
55	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
56	static long pagesize;
57	# else
58	# define BOOT_PAGESIZE
59	# endif	95	#endif
60	#endif
61		96
62	#define SUB_INIT "Coro::State::initialize"	97	/* prefer perl internal functions over our own? */
63	#define UCORO_STATE "_coro_state"	98	#ifndef CORO_PREFER_PERL_FUNCTIONS
		99	# define CORO_PREFER_PERL_FUNCTIONS 0
		100	#endif
64		101
65	/* The next macro should declare a variable stacklevel that contains and approximation	102	/* The next macros try to return the current stack pointer, in an as
66	* to the current C stack pointer. Its property is that it changes with each call	103	* portable way as possible. */
67	* and should be unique. */	104	#define dSTACKLEVEL volatile char stacklevel
68	#define dSTACKLEVEL void *stacklevel = &stacklevel	105	#define STACKLEVEL ((void *)&stacklevel)
69		106
70	#define IN_DESTRUCT (PL_main_cv == Nullcv)	107	#define IN_DESTRUCT (PL_main_cv == Nullcv)
71		108
72	#define labs(l) ((l) >= 0 ? (l) : -(l))	109	#if __GNUC__ >= 3
		110	# define attribute(x) __attribute__(x)
		111	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		112	# define expect(expr,value) __builtin_expect ((expr),(value))
		113	#else
		114	# define attribute(x)
		115	# define BARRIER
		116	# define expect(expr,value) (expr)
		117	#endif
		118
		119	#define expect_false(expr) expect ((expr) != 0, 0)
		120	#define expect_true(expr) expect ((expr) != 0, 1)
		121
		122	#define NOINLINE attribute ((noinline))
73		123
74	#include "CoroAPI.h"	124	#include "CoroAPI.h"
75		125
76	#ifdef USE_ITHREADS	126	#ifdef USE_ITHREADS
77	static perl_mutex coro_mutex;	127	static perl_mutex coro_mutex;
…		…
80	#else	130	#else
81	# define LOCK (void)0	131	# define LOCK (void)0
82	# define UNLOCK (void)0	132	# define UNLOCK (void)0
83	#endif	133	#endif
84		134
		135	/* helper storage struct for Coro::AIO */
		136	struct io_state
		137	{
		138	int errorno;
		139	I32 laststype;
		140	int laststatval;
		141	Stat_t statcache;
		142	};
		143
		144	static size_t coro_stacksize = CORO_STACKSIZE;
85	static struct CoroAPI coroapi;	145	static struct CoroAPI coroapi;
86	static AV *main_mainstack; /* used to differentiate between $main and others */	146	static AV *main_mainstack; /* used to differentiate between $main and others */
		147	static JMPENV *main_top_env;
87	static HV *coro_state_stash;	148	static HV *coro_state_stash, *coro_stash;
88	static SV *ucoro_state_sv;
89	static U32 ucoro_state_hash;
90	static SV *coro_mortal; /* will be freed after next transfer */	149	static SV *coro_mortal; /* will be freed after next transfer */
91		150
92	/* this is actually not only the c stack but also c registers etc... */	151	static GV *irsgv; /* $/ */
		152	static GV *stdoutgv; /* *STDOUT */
		153
		154	/* async_pool helper stuff */
		155	static SV *sv_pool_rss;
		156	static SV *sv_pool_size;
		157	static AV *av_async_pool;
		158
		159	static struct coro_cctx *cctx_first;
		160	static int cctx_count, cctx_idle;
		161
		162	enum {
		163	CC_MAPPED = 0x01,
		164	CC_NOREUSE = 0x02, /* throw this away after tracing */
		165	CC_TRACE = 0x04,
		166	CC_TRACE_SUB = 0x08, /* trace sub calls */
		167	CC_TRACE_LINE = 0x10, /* trace each statement */
		168	CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
		169	};
		170
		171	/* this is a structure representing a c-level coroutine */
		172	typedef struct coro_cctx {
		173	struct coro_cctx *next;
		174
		175	/* the stack */
		176	void *sptr;
		177	size_t ssize;
		178
		179	/* cpu state */
		180	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		181	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
		182	JMPENV *top_env;
		183	coro_context cctx;
		184
		185	#if CORO_USE_VALGRIND
		186	int valgrind_id;
		187	#endif
		188	unsigned char flags;
		189	} coro_cctx;
		190
		191	enum {
		192	CF_RUNNING = 0x0001, /* coroutine is running */
		193	CF_READY = 0x0002, /* coroutine is ready */
		194	CF_NEW = 0x0004, /* has never been switched to */
		195	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
		196	};
		197
		198	/* the structure where most of the perl state is stored, overlaid on the cxstack */
93	typedef struct {	199	typedef struct {
94	int refcnt; /* pointer reference counter */	200	SV *defsv;
95	int usecnt; /* shared by how many coroutines */	201	AV *defav;
96	int gencnt; /* generation counter */	202	SV *errsv;
		203	SV *irsgv;
		204	#define VAR(name,type) type name;
		205	# include "state.h"
		206	#undef VAR
		207	} perl_slots;
97		208
98	coro_context cctx;	209	#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
99		210
100	void *sptr;	211	/* this is a structure representing a perl-level coroutine */
101	long ssize; /* positive == mmap, otherwise malloc */
102	} coro_stack;
103
104	struct coro {	212	struct coro {
105	/* the optional C context */	213	/* the c coroutine allocated to this perl coroutine, if any */
106	coro_stack *stack;	214	coro_cctx *cctx;
107	void *cursp;
108	int gencnt;
109		215
110	/* optionally saved, might be zero */	216	/* process data */
111	AV *defav;
112	SV *defsv;
113	SV *errsv;
114
115	/* saved global state not related to stacks */
116	U8 dowarn;
117	I32 in_eval;
118
119	/* the stacks and related info (callchain etc..) */
120	PERL_SI *curstackinfo;
121	AV *curstack;
122	AV *mainstack;	217	AV *mainstack;
123	SV **stack_sp;	218	perl_slots *slot; /* basically the saved sp */
124	OP *op;
125	SV **curpad;
126	AV *comppad;
127	CV *compcv;
128	SV **stack_base;
129	SV **stack_max;
130	SV **tmps_stack;
131	I32 tmps_floor;
132	I32 tmps_ix;
133	I32 tmps_max;
134	I32 *markstack;
135	I32 *markstack_ptr;
136	I32 *markstack_max;
137	I32 *scopestack;
138	I32 scopestack_ix;
139	I32 scopestack_max;
140	ANY *savestack;
141	I32 savestack_ix;
142	I32 savestack_max;
143	OP **retstack;
144	I32 retstack_ix;
145	I32 retstack_max;
146	PMOP *curpm;
147	COP *curcop;
148	JMPENV *top_env;
149		219
150	/* data associated with this coroutine (initial args) */	220	/* data associated with this coroutine (initial args) */
151	AV *args;	221	AV *args;
		222	int refcnt;
		223	int flags; /* CF_ flags */
		224
		225	/* statistics */
		226	int usecount; /* number of transfers to this coro */
		227
		228	/* coro process data */
		229	int prio;
		230	SV *throw;
		231
		232	/* async_pool */
		233	SV *saved_deffh;
		234
		235	/* linked list */
		236	struct coro *next, *prev;
		237	HV *hv; /* the perl hash associated with this coro, if any */
152	};	238	};
153		239
154	typedef struct coro *Coro__State;	240	typedef struct coro *Coro__State;
155	typedef struct coro *Coro__State_or_hashref;	241	typedef struct coro *Coro__State_or_hashref;
156		242
		243	/** Coro ********************************************************************/
		244
		245	#define PRIO_MAX 3
		246	#define PRIO_HIGH 1
		247	#define PRIO_NORMAL 0
		248	#define PRIO_LOW -1
		249	#define PRIO_IDLE -3
		250	#define PRIO_MIN -4
		251
		252	/* for Coro.pm */
		253	static SV *coro_current;
		254	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		255	static int coro_nready;
		256	static struct coro *coro_first;
		257
		258	/** lowlevel stuff **********************************************************/
		259
157	static AV *	260	static AV *
158	coro_clone_padlist (pTHX_ CV *cv)	261	coro_clone_padlist (pTHX_ CV *cv)
159	{	262	{
160	AV *padlist = CvPADLIST (cv);	263	AV *padlist = CvPADLIST (cv);
161	AV *newpadlist, *newpad;	264	AV *newpadlist, *newpad;
162		265
163	newpadlist = newAV ();	266	newpadlist = newAV ();
164	AvREAL_off (newpadlist);	267	AvREAL_off (newpadlist);
165	#if PERL_VERSION < 9	268	#if PERL_VERSION_ATLEAST (5,9,0)
		269	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		270	#else
166	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);	271	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
167	#else
168	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
169	#endif	272	#endif
170	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];	273	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
171	--AvFILLp (padlist);	274	--AvFILLp (padlist);
172		275
173	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));	276	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
…		…
217		320
218	#define PERL_MAGIC_coro PERL_MAGIC_ext	321	#define PERL_MAGIC_coro PERL_MAGIC_ext
219		322
220	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};	323	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
221		324
		325	#define CORO_MAGIC(cv) \
		326	SvMAGIC (cv) \
		327	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		328	? SvMAGIC (cv) \
		329	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		330	: 0
		331
		332	static struct coro *
		333	SvSTATE_ (pTHX_ SV *coro)
		334	{
		335	HV *stash;
		336	MAGIC *mg;
		337
		338	if (SvROK (coro))
		339	coro = SvRV (coro);
		340
		341	if (expect_false (SvTYPE (coro) != SVt_PVHV))
		342	croak ("Coro::State object required");
		343
		344	stash = SvSTASH (coro);
		345	if (expect_false (stash != coro_stash && stash != coro_state_stash))
		346	{
		347	/* very slow, but rare, check */
		348	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		349	croak ("Coro::State object required");
		350	}
		351
		352	mg = CORO_MAGIC (coro);
		353	return (struct coro *)mg->mg_ptr;
		354	}
		355
		356	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
		357
222	/* the next two functions merely cache the padlists */	358	/* the next two functions merely cache the padlists */
223	static void	359	static void
224	get_padlist (pTHX_ CV *cv)	360	get_padlist (pTHX_ CV *cv)
225	{	361	{
226	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	362	MAGIC *mg = CORO_MAGIC (cv);
		363	AV *av;
227		364
228	if (mg && AvFILLp ((AV *)mg->mg_obj) >= 0)	365	if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
229	CvPADLIST (cv) = (AV *)av_pop ((AV *)mg->mg_obj);	366	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
230	else	367	else
231	{	368	{
232	#if 0	369	#if CORO_PREFER_PERL_FUNCTIONS
233	/* this should work - but it doesn't :( */	370	/* this is probably cleaner, but also slower? */
234	CV *cp = Perl_cv_clone (aTHX_ cv);	371	CV *cp = Perl_cv_clone (cv);
235	CvPADLIST (cv) = CvPADLIST (cp);	372	CvPADLIST (cv) = CvPADLIST (cp);
236	CvPADLIST (cp) = 0;	373	CvPADLIST (cp) = 0;
237	SvREFCNT_dec (cp);	374	SvREFCNT_dec (cp);
238	#else	375	#else
239	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);	376	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
…		…
242	}	379	}
243		380
244	static void	381	static void
245	put_padlist (pTHX_ CV *cv)	382	put_padlist (pTHX_ CV *cv)
246	{	383	{
247	MAGIC *mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	384	MAGIC *mg = CORO_MAGIC (cv);
		385	AV *av;
248		386
249	if (!mg)	387	if (expect_false (!mg))
250	{	388	{
251	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);	389	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
252	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);	390	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
253	mg->mg_virtual = &vtbl_coro;	391	mg->mg_virtual = &vtbl_coro;
254	mg->mg_obj = (SV *)newAV ();	392	mg->mg_obj = (SV *)newAV ();
255	}	393	}
256		394
257	av_push ((AV *)mg->mg_obj, (SV *)CvPADLIST (cv));	395	av = (AV *)mg->mg_obj;
258	}
259		396
260	#define SB do {	397	if (expect_false (AvFILLp (av) >= AvMAX (av)))
261	#define SE } while (0)	398	av_extend (av, AvMAX (av) + 1);
262		399
263	#define LOAD(state) load_state(aTHX_ (state));	400	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
264	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));	401	}
265		402
266	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); (val) = 0; SE	403	/** load & save, init *******************************************************/
267		404
268	static void	405	static void
269	load_state(pTHX_ Coro__State c)	406	load_perl (pTHX_ Coro__State c)
270	{	407	{
271	PL_dowarn = c->dowarn;	408	perl_slots *slot = c->slot;
272	PL_in_eval = c->in_eval;	409	c->slot = 0;
273		410
274	PL_curstackinfo = c->curstackinfo;
275	PL_curstack = c->curstack;
276	PL_mainstack = c->mainstack;	411	PL_mainstack = c->mainstack;
277	PL_stack_sp = c->stack_sp;
278	PL_op = c->op;
279	PL_curpad = c->curpad;
280	PL_comppad = c->comppad;
281	PL_compcv = c->compcv;
282	PL_stack_base = c->stack_base;
283	PL_stack_max = c->stack_max;
284	PL_tmps_stack = c->tmps_stack;
285	PL_tmps_floor = c->tmps_floor;
286	PL_tmps_ix = c->tmps_ix;
287	PL_tmps_max = c->tmps_max;
288	PL_markstack = c->markstack;
289	PL_markstack_ptr = c->markstack_ptr;
290	PL_markstack_max = c->markstack_max;
291	PL_scopestack = c->scopestack;
292	PL_scopestack_ix = c->scopestack_ix;
293	PL_scopestack_max = c->scopestack_max;
294	PL_savestack = c->savestack;
295	PL_savestack_ix = c->savestack_ix;
296	PL_savestack_max = c->savestack_max;
297	#if PERL_VERSION < 9
298	PL_retstack = c->retstack;
299	PL_retstack_ix = c->retstack_ix;
300	PL_retstack_max = c->retstack_max;
301	#endif
302	PL_curpm = c->curpm;
303	PL_curcop = c->curcop;
304	PL_top_env = c->top_env;
305		412
306	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	413	GvSV (PL_defgv) = slot->defsv;
307	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	414	GvAV (PL_defgv) = slot->defav;
308	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	415	GvSV (PL_errgv) = slot->errsv;
		416	GvSV (irsgv) = slot->irsgv;
		417
		418	#define VAR(name,type) PL_ ## name = slot->name;
		419	# include "state.h"
		420	#undef VAR
309		421
310	{	422	{
311	dSP;	423	dSP;
		424
312	CV *cv;	425	CV *cv;
313		426
314	/* now do the ugly restore mess */	427	/* now do the ugly restore mess */
315	while ((cv = (CV *)POPs))	428	while (expect_true (cv = (CV *)POPs))
316	{	429	{
317	AV *padlist = (AV *)POPs;
318
319	if (padlist)
320	{
321	put_padlist (aTHX_ cv); /* mark this padlist as available */	430	put_padlist (aTHX_ cv); /* mark this padlist as available */
322	CvPADLIST(cv) = padlist;	431	CvDEPTH (cv) = PTR2IV (POPs);
323	}	432	CvPADLIST (cv) = (AV *)POPs;
324
325	++CvDEPTH(cv);
326	}	433	}
327		434
328	PUTBACK;	435	PUTBACK;
329	}	436	}
330	}	437	}
331		438
332	static void	439	static void
333	save_state(pTHX_ Coro__State c, int flags)	440	save_perl (pTHX_ Coro__State c)
334	{	441	{
335	{	442	{
336	dSP;	443	dSP;
337	I32 cxix = cxstack_ix;	444	I32 cxix = cxstack_ix;
338	PERL_CONTEXT *ccstk = cxstack;	445	PERL_CONTEXT *ccstk = cxstack;
…		…
341	/*	448	/*
342	* the worst thing you can imagine happens first - we have to save	449	* the worst thing you can imagine happens first - we have to save
343	* (and reinitialize) all cv's in the whole callchain :(	450	* (and reinitialize) all cv's in the whole callchain :(
344	*/	451	*/
345		452
346	PUSHs (Nullsv);	453	XPUSHs (Nullsv);
347	/* this loop was inspired by pp_caller */	454	/* this loop was inspired by pp_caller */
348	for (;;)	455	for (;;)
349	{	456	{
350	while (cxix >= 0)	457	while (expect_true (cxix >= 0))
351	{	458	{
352	PERL_CONTEXT *cx = &ccstk[cxix--];	459	PERL_CONTEXT *cx = &ccstk[cxix--];
353		460
354	if (CxTYPE(cx) == CXt_SUB)	461	if (expect_true (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT))
355	{	462	{
356	CV *cv = cx->blk_sub.cv;	463	CV *cv = cx->blk_sub.cv;
		464
357	if (CvDEPTH(cv))	465	if (expect_true (CvDEPTH (cv)))
358	{	466	{
359	EXTEND (SP, CvDEPTH(cv)*2);	467	EXTEND (SP, 3);
360
361	while (--CvDEPTH(cv))
362	{
363	/* this tells the restore code to increment CvDEPTH */
364	PUSHs (Nullsv);
365	PUSHs ((SV *)cv);
366	}
367
368	PUSHs ((SV *)CvPADLIST(cv));	468	PUSHs ((SV *)CvPADLIST (cv));
		469	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
369	PUSHs ((SV *)cv);	470	PUSHs ((SV *)cv);
370		471
		472	CvDEPTH (cv) = 0;
371	get_padlist (aTHX_ cv);	473	get_padlist (aTHX_ cv);
372	}	474	}
373	}	475	}
374	#ifdef CXt_FORMAT
375	else if (CxTYPE(cx) == CXt_FORMAT)
376	{
377	/* I never used formats, so how should I know how these are implemented? */
378	/* my bold guess is as a simple, plain sub... */
379	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
380	}
381	#endif
382	}	476	}
383		477
384	if (top_si->si_type == PERLSI_MAIN)	478	if (expect_true (top_si->si_type == PERLSI_MAIN))
385	break;	479	break;
386		480
387	top_si = top_si->si_prev;	481	top_si = top_si->si_prev;
388	ccstk = top_si->si_cxstack;	482	ccstk = top_si->si_cxstack;
389	cxix = top_si->si_cxix;	483	cxix = top_si->si_cxix;
390	}	484	}
391		485
392	PUTBACK;	486	PUTBACK;
393	}	487	}
394		488
395	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	489	/* allocate some space on the context stack for our purposes */
396	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	490	{
397	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	491	/* we manually unroll here, as usually 2 slots is enough */
		492	int i;
		493	if (SLOT_COUNT >= 1) CXINC;
		494	if (SLOT_COUNT >= 2) CXINC;
		495	if (SLOT_COUNT >= 3) CXINC;
		496	for (i = 3; i < SLOT_COUNT; ++i)
		497	CXINC;
398		498
399	c->dowarn = PL_dowarn;	499	cxstack_ix -= SLOT_COUNT; /* undo allocation */
400	c->in_eval = PL_in_eval;	500	}
401		501
402	c->curstackinfo = PL_curstackinfo;
403	c->curstack = PL_curstack;
404	c->mainstack = PL_mainstack;	502	c->mainstack = PL_mainstack;
405	c->stack_sp = PL_stack_sp;	503
406	c->op = PL_op;	504	{
407	c->curpad = PL_curpad;	505	perl_slots *slot = c->slot = (perl_slots *)(cxstack + cxstack_ix + 1);
408	c->comppad = PL_comppad;	506
409	c->compcv = PL_compcv;	507	slot->defav = GvAV (PL_defgv);
410	c->stack_base = PL_stack_base;	508	slot->defsv = DEFSV;
411	c->stack_max = PL_stack_max;	509	slot->errsv = ERRSV;
412	c->tmps_stack = PL_tmps_stack;	510	slot->irsgv = GvSV (irsgv);
413	c->tmps_floor = PL_tmps_floor;	511
414	c->tmps_ix = PL_tmps_ix;	512	#define VAR(name,type) slot->name = PL_ ## name;
415	c->tmps_max = PL_tmps_max;	513	# include "state.h"
416	c->markstack = PL_markstack;	514	#undef VAR
417	c->markstack_ptr = PL_markstack_ptr;	515	}
418	c->markstack_max = PL_markstack_max;
419	c->scopestack = PL_scopestack;
420	c->scopestack_ix = PL_scopestack_ix;
421	c->scopestack_max = PL_scopestack_max;
422	c->savestack = PL_savestack;
423	c->savestack_ix = PL_savestack_ix;
424	c->savestack_max = PL_savestack_max;
425	#if PERL_VERSION < 9
426	c->retstack = PL_retstack;
427	c->retstack_ix = PL_retstack_ix;
428	c->retstack_max = PL_retstack_max;
429	#endif
430	c->curpm = PL_curpm;
431	c->curcop = PL_curcop;
432	c->top_env = PL_top_env;
433	}	516	}
434		517
435	/*	518	/*
436	* allocate various perl stacks. This is an exact copy	519	* allocate various perl stacks. This is an exact copy
437	* of perl.c:init_stacks, except that it uses less memory	520	* of perl.c:init_stacks, except that it uses less memory
438	* on the (sometimes correct) assumption that coroutines do	521	* on the (sometimes correct) assumption that coroutines do
439	* not usually need a lot of stackspace.	522	* not usually need a lot of stackspace.
440	*/	523	*/
		524	#if CORO_PREFER_PERL_FUNCTIONS
		525	# define coro_init_stacks init_stacks
		526	#else
441	static void	527	static void
442	coro_init_stacks (pTHX)	528	coro_init_stacks (pTHX)
443	{	529	{
444	LOCK;	530	PL_curstackinfo = new_stackinfo(32, 8);
445
446	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);
447	PL_curstackinfo->si_type = PERLSI_MAIN;	531	PL_curstackinfo->si_type = PERLSI_MAIN;
448	PL_curstack = PL_curstackinfo->si_stack;	532	PL_curstack = PL_curstackinfo->si_stack;
449	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	533	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
450		534
451	PL_stack_base = AvARRAY(PL_curstack);	535	PL_stack_base = AvARRAY(PL_curstack);
452	PL_stack_sp = PL_stack_base;	536	PL_stack_sp = PL_stack_base;
453	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	537	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
454		538
455	New(50,PL_tmps_stack,96,SV*);	539	New(50,PL_tmps_stack,32,SV*);
456	PL_tmps_floor = -1;	540	PL_tmps_floor = -1;
457	PL_tmps_ix = -1;	541	PL_tmps_ix = -1;
458	PL_tmps_max = 96;	542	PL_tmps_max = 32;
459		543
460	New(54,PL_markstack,16,I32);	544	New(54,PL_markstack,16,I32);
461	PL_markstack_ptr = PL_markstack;	545	PL_markstack_ptr = PL_markstack;
462	PL_markstack_max = PL_markstack + 16;	546	PL_markstack_max = PL_markstack + 16;
463		547
464	#ifdef SET_MARK_OFFSET	548	#ifdef SET_MARK_OFFSET
465	SET_MARK_OFFSET;	549	SET_MARK_OFFSET;
466	#endif	550	#endif
467		551
468	New(54,PL_scopestack,16,I32);	552	New(54,PL_scopestack,8,I32);
469	PL_scopestack_ix = 0;	553	PL_scopestack_ix = 0;
470	PL_scopestack_max = 16;	554	PL_scopestack_max = 8;
471		555
472	New(54,PL_savestack,96,ANY);	556	New(54,PL_savestack,24,ANY);
473	PL_savestack_ix = 0;	557	PL_savestack_ix = 0;
474	PL_savestack_max = 96;	558	PL_savestack_max = 24;
475		559
476	#if PERL_VERSION < 9	560	#if !PERL_VERSION_ATLEAST (5,9,0)
477	New(54,PL_retstack,8,OP*);	561	New(54,PL_retstack,4,OP*);
478	PL_retstack_ix = 0;	562	PL_retstack_ix = 0;
479	PL_retstack_max = 8;	563	PL_retstack_max = 4;
480	#endif	564	#endif
481
482	UNLOCK;
483	}	565	}
		566	#endif
484		567
485	/*	568	/*
486	* destroy the stacks, the callchain etc...	569	* destroy the stacks, the callchain etc...
487	*/	570	*/
488	static void	571	static void
489	destroy_stacks(pTHX)	572	coro_destroy_stacks (pTHX)
490	{	573	{
491	if (!IN_DESTRUCT)
492	{
493	/* is this ugly, I ask? */
494	LEAVE_SCOPE (0);
495
496	/* sure it is, but more important: is it correct?? :/ */
497	FREETMPS;
498
499	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
500	}
501
502	while (PL_curstackinfo->si_next)	574	while (PL_curstackinfo->si_next)
503	PL_curstackinfo = PL_curstackinfo->si_next;	575	PL_curstackinfo = PL_curstackinfo->si_next;
504		576
505	while (PL_curstackinfo)	577	while (PL_curstackinfo)
506	{	578	{
507	PERL_SI *p = PL_curstackinfo->si_prev;	579	PERL_SI *p = PL_curstackinfo->si_prev;
508		580
509	{ /*D*//*remove*/
510	dSP;
511	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
512	PUTBACK; /* possibly superfluous */
513	}
514
515	if (!IN_DESTRUCT)	581	if (!IN_DESTRUCT)
516	{
517	dounwind (-1);/*D*//*remove*/
518	SvREFCNT_dec (PL_curstackinfo->si_stack);	582	SvREFCNT_dec (PL_curstackinfo->si_stack);
519	}
520		583
521	Safefree (PL_curstackinfo->si_cxstack);	584	Safefree (PL_curstackinfo->si_cxstack);
522	Safefree (PL_curstackinfo);	585	Safefree (PL_curstackinfo);
523	PL_curstackinfo = p;	586	PL_curstackinfo = p;
524	}	587	}
525		588
526	Safefree (PL_tmps_stack);	589	Safefree (PL_tmps_stack);
527	Safefree (PL_markstack);	590	Safefree (PL_markstack);
528	Safefree (PL_scopestack);	591	Safefree (PL_scopestack);
529	Safefree (PL_savestack);	592	Safefree (PL_savestack);
530	#if PERL_VERSION < 9	593	#if !PERL_VERSION_ATLEAST (5,9,0)
531	Safefree (PL_retstack);	594	Safefree (PL_retstack);
532	#endif	595	#endif
533	}	596	}
534		597
535	static void	598	static size_t
536	allocate_stack (Coro__State ctx, int alloc)	599	coro_rss (pTHX_ struct coro *coro)
537	{	600	{
538	coro_stack *stack;	601	size_t rss = sizeof (*coro);
539		602
540	New (0, stack, 1, coro_stack);	603	if (coro->mainstack)
541
542	stack->refcnt = 1;
543	stack->usecnt = 1;
544	stack->gencnt = ctx->gencnt = 0;
545
546	if (alloc)
547	{	604	{
548	#if HAVE_MMAP	605	perl_slots tmp_slot;
549	stack->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE; /* mmap should do allocate-on-write for us */	606	perl_slots *slot;
550	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);	607
551	if (stack->sptr != (void *)-1)	608	if (coro->flags & CF_RUNNING)
552	{	609	{
553	# if STACKGUARD	610	slot = &tmp_slot;
554	mprotect (stack->sptr, STACKGUARD * PAGESIZE, PROT_NONE);	611
555	# endif	612	#define VAR(name,type) slot->name = PL_ ## name;
		613	# include "state.h"
		614	#undef VAR
556	}	615	}
557	else	616	else
558	#endif	617	slot = coro->slot;
559	{
560	stack->ssize = - (STACKSIZE * (long)sizeof (long));
561	New (0, stack->sptr, STACKSIZE, long);
562	}
563	}
564	else
565	stack->sptr = 0;
566		618
567	ctx->stack = stack;	619	rss += sizeof (slot->curstackinfo);
568	}	620	rss += (slot->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
		621	rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (slot->curstack)) * sizeof (SV *);
		622	rss += slot->tmps_max * sizeof (SV *);
		623	rss += (slot->markstack_max - slot->markstack_ptr) * sizeof (I32);
		624	rss += slot->scopestack_max * sizeof (I32);
		625	rss += slot->savestack_max * sizeof (ANY);
569		626
570	static void	627	#if !PERL_VERSION_ATLEAST (5,9,0)
571	deallocate_stack (Coro__State ctx)	628	rss += slot->retstack_max * sizeof (OP *);
572	{	629	#endif
573	coro_stack *stack = ctx->stack;
574
575	ctx->stack = 0;
576
577	if (stack)
578	{	630	}
579	if (!--stack->refcnt)
580	{
581	#ifdef HAVE_MMAP
582	if (stack->ssize > 0 && stack->sptr)
583	munmap (stack->sptr, stack->ssize);
584	else
585	#endif
586	Safefree (stack->sptr);
587		631
588	Safefree (stack);	632	return rss;
589	}
590	else if (ctx->gencnt == stack->gencnt)
591	--stack->usecnt;
592	}
593	}	633	}
594		634
		635	/** coroutine stack handling ************************************************/
		636
595	static void	637	static void
596	setup_coro (void *arg)	638	coro_setup (pTHX_ struct coro *coro)
597	{	639	{
598	/*	640	/*
599	* emulate part of the perl startup here.	641	* emulate part of the perl startup here.
600	*/	642	*/
		643	coro_init_stacks (aTHX);
		644
		645	PL_runops = RUNOPS_DEFAULT;
		646	PL_curcop = &PL_compiling;
		647	PL_in_eval = EVAL_NULL;
		648	PL_comppad = 0;
		649	PL_curpm = 0;
		650	PL_curpad = 0;
		651	PL_localizing = 0;
		652	PL_dirty = 0;
		653	PL_restartop = 0;
		654	PL_diehook = 0;
		655	PL_warnhook = 0;
		656
		657	GvSV (PL_defgv) = newSV (0);
		658	GvAV (PL_defgv) = coro->args; coro->args = 0;
		659	GvSV (PL_errgv) = newSV (0);
		660	GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
		661	PL_rs = newSVsv (GvSV (irsgv));
		662	PL_defoutgv = (GV *)SvREFCNT_inc (stdoutgv);
		663
		664	{
		665	dSP;
		666	LOGOP myop;
		667
		668	Zero (&myop, 1, LOGOP);
		669	myop.op_next = Nullop;
		670	myop.op_flags = OPf_WANT_VOID;
		671
		672	PUSHMARK (SP);
		673	XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));
		674	PUTBACK;
		675	PL_op = (OP *)&myop;
		676	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		677	SPAGAIN;
		678	}
		679
		680	ENTER; /* necessary e.g. for dounwind and to balance the xsub-entersub */
		681	}
		682
		683	static void
		684	coro_destroy (pTHX_ struct coro *coro)
		685	{
		686	if (!IN_DESTRUCT)
		687	{
		688	/* restore all saved variables and stuff */
		689	LEAVE_SCOPE (0);
		690	assert (PL_tmps_floor == -1);
		691
		692	/* free all temporaries */
		693	FREETMPS;
		694	assert (PL_tmps_ix == -1);
		695
		696	/* unwind all extra stacks */
		697	POPSTACK_TO (PL_mainstack);
		698
		699	/* unwind main stack */
		700	dounwind (-1);
		701	}
		702
		703	SvREFCNT_dec (GvSV (PL_defgv));
		704	SvREFCNT_dec (GvAV (PL_defgv));
		705	SvREFCNT_dec (GvSV (PL_errgv));
		706	SvREFCNT_dec (PL_defoutgv);
		707	SvREFCNT_dec (PL_rs);
		708	SvREFCNT_dec (GvSV (irsgv));
		709
		710	SvREFCNT_dec (PL_diehook);
		711	SvREFCNT_dec (PL_warnhook);
		712
		713	SvREFCNT_dec (coro->saved_deffh);
		714	SvREFCNT_dec (coro->throw);
		715
		716	coro_destroy_stacks (aTHX);
		717	}
		718
		719	static void
		720	free_coro_mortal (pTHX)
		721	{
		722	if (expect_true (coro_mortal))
		723	{
		724	SvREFCNT_dec (coro_mortal);
		725	coro_mortal = 0;
		726	}
		727	}
		728
		729	static int
		730	runops_trace (pTHX)
		731	{
		732	COP *oldcop = 0;
		733	int oldcxix = -2;
		734	struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */
		735	coro_cctx *cctx = coro->cctx;
		736
		737	while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
		738	{
		739	PERL_ASYNC_CHECK ();
		740
		741	if (cctx->flags & CC_TRACE_ALL)
		742	{
		743	if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
		744	{
		745	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
		746	SV **bot, **top;
		747	AV *av = newAV (); /* return values */
		748	SV **cb;
		749	dSP;
		750
		751	GV *gv = CvGV (cx->blk_sub.cv);
		752	SV *fullname = sv_2mortal (newSV (0));
		753	if (isGV (gv))
		754	gv_efullname3 (fullname, gv, 0);
		755
		756	bot = PL_stack_base + cx->blk_oldsp + 1;
		757	top = cx->blk_gimme == G_ARRAY ? SP + 1
		758	: cx->blk_gimme == G_SCALAR ? bot + 1
		759	: bot;
		760
		761	av_extend (av, top - bot);
		762	while (bot < top)
		763	av_push (av, SvREFCNT_inc (*bot++));
		764
		765	PL_runops = RUNOPS_DEFAULT;
		766	ENTER;
		767	SAVETMPS;
		768	EXTEND (SP, 3);
		769	PUSHMARK (SP);
		770	PUSHs (&PL_sv_no);
		771	PUSHs (fullname);
		772	PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
		773	PUTBACK;
		774	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		775	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		776	SPAGAIN;
		777	FREETMPS;
		778	LEAVE;
		779	PL_runops = runops_trace;
		780	}
		781
		782	if (oldcop != PL_curcop)
		783	{
		784	oldcop = PL_curcop;
		785
		786	if (PL_curcop != &PL_compiling)
		787	{
		788	SV **cb;
		789
		790	if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
		791	{
		792	PERL_CONTEXT *cx = &cxstack[cxstack_ix];
		793
		794	if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
		795	{
		796	runops_proc_t old_runops = PL_runops;
		797	dSP;
		798	GV *gv = CvGV (cx->blk_sub.cv);
		799	SV *fullname = sv_2mortal (newSV (0));
		800
		801	if (isGV (gv))
		802	gv_efullname3 (fullname, gv, 0);
		803
		804	PL_runops = RUNOPS_DEFAULT;
		805	ENTER;
		806	SAVETMPS;
		807	EXTEND (SP, 3);
		808	PUSHMARK (SP);
		809	PUSHs (&PL_sv_yes);
		810	PUSHs (fullname);
		811	PUSHs (cx->blk_sub.hasargs ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
		812	PUTBACK;
		813	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
		814	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		815	SPAGAIN;
		816	FREETMPS;
		817	LEAVE;
		818	PL_runops = runops_trace;
		819	}
		820
		821	oldcxix = cxstack_ix;
		822	}
		823
		824	if (cctx->flags & CC_TRACE_LINE)
		825	{
		826	dSP;
		827
		828	PL_runops = RUNOPS_DEFAULT;
		829	ENTER;
		830	SAVETMPS;
		831	EXTEND (SP, 3);
		832	PL_runops = RUNOPS_DEFAULT;
		833	PUSHMARK (SP);
		834	PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
		835	PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
		836	PUTBACK;
		837	cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
		838	if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		839	SPAGAIN;
		840	FREETMPS;
		841	LEAVE;
		842	PL_runops = runops_trace;
		843	}
		844	}
		845	}
		846	}
		847	}
		848
		849	TAINT_NOT;
		850	return 0;
		851	}
		852
		853	/* inject a fake call to Coro::State::_cctx_init into the execution */
		854	/* _cctx_init should be careful, as it could be called at almost any time */
		855	/* during execution of a perl program */
		856	static void NOINLINE
		857	prepare_cctx (pTHX_ coro_cctx *cctx)
		858	{
		859	dSP;
		860	LOGOP myop;
		861
		862	PL_top_env = &PL_start_env;
		863
		864	if (cctx->flags & CC_TRACE)
		865	PL_runops = runops_trace;
		866
		867	Zero (&myop, 1, LOGOP);
		868	myop.op_next = PL_op;
		869	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		870
		871	PUSHMARK (SP);
		872	EXTEND (SP, 2);
		873	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		874	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		875	PUTBACK;
		876	PL_op = (OP *)&myop;
		877	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		878	SPAGAIN;
		879	}
		880
		881	/*
		882	* this is a _very_ stripped down perl interpreter ;)
		883	*/
		884	static void
		885	coro_run (void *arg)
		886	{
601	dTHX;	887	dTHX;
602	dSP;
603	Coro__State ctx = (Coro__State)arg;
604	SV *sub_init = (SV *)get_cv (SUB_INIT, FALSE);
605		888
606	coro_init_stacks (aTHX);	889	/* coro_run is the alternative tail of transfer(), so unlock here. */
607	/*PL_curcop = 0;*/	890	UNLOCK;
608	/*PL_in_eval = PL_in_eval;*/ /* inherit */
609	SvREFCNT_dec (GvAV (PL_defgv));
610	GvAV (PL_defgv) = ctx->args; ctx->args = 0;
611		891
612	SPAGAIN;	892	/* we now skip the entersub that lead to transfer() */
		893	PL_op = PL_op->op_next;
613		894
614	if (ctx->stack)	895	/* inject a fake subroutine call to cctx_init */
615	{	896	prepare_cctx (aTHX_ (coro_cctx *)arg);
616	ctx->cursp = 0;
617		897
618	PUSHMARK(SP);	898	/* somebody or something will hit me for both perl_run and PL_restartop */
619	PUTBACK;	899	PL_restartop = PL_op;
620	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);	900	perl_run (PL_curinterp);
621		901
622	if (SvTRUE (ERRSV))	902	/*
623	croak (NULL);	903	* If perl-run returns we assume exit() was being called or the coro
624	else	904	* fell off the end, which seems to be the only valid (non-bug)
625	croak ("FATAL: CCTXT coroutine returned!");	905	* reason for perl_run to return. We try to exit by jumping to the
		906	* bootstrap-time "top" top_env, as we cannot restore the "main"
		907	* coroutine as Coro has no such concept
		908	*/
		909	PL_top_env = main_top_env;
		910	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
		911	}
		912
		913	static coro_cctx *
		914	cctx_new ()
		915	{
		916	coro_cctx *cctx;
		917	void *stack_start;
		918	size_t stack_size;
		919
		920	++cctx_count;
		921
		922	Newz (0, cctx, 1, coro_cctx);
		923
		924	#if HAVE_MMAP
		925
		926	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
		927	/* mmap supposedly does allocate-on-write for us */
		928	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		929
		930	if (cctx->sptr != (void *)-1)
		931	{
		932	# if CORO_STACKGUARD
		933	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
		934	# endif
		935	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
		936	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
		937	cctx->flags |= CC_MAPPED;
626	}	938	}
627	else	939	else
628	{	940	#endif
629	UNOP myop;
630
631	Zero(&myop, 1, UNOP);
632	myop.op_next = Nullop;
633	myop.op_flags = OPf_WANT_VOID;
634
635	PL_op = (OP *)&myop;
636
637	PUSHMARK(SP);
638	XPUSHs (sub_init);
639	/*
640	* the next line is slightly wrong, as PL_op->op_next
641	* is actually being executed so we skip the first op.
642	* that doesn't matter, though, since it is only
643	* pp_nextstate and we never return...
644	* ah yes, and I don't care anyways ;)
645	*/
646	PUTBACK;
647	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
648	SPAGAIN;
649
650	ENTER; /* necessary e.g. for dounwind */
651	}	941	{
652	}	942	cctx->ssize = coro_stacksize * (long)sizeof (long);
		943	New (0, cctx->sptr, coro_stacksize, long);
653		944
654	static void	945	if (!cctx->sptr)
655	continue_coro (void *arg)	946	{
656	{	947	perror ("FATAL: unable to allocate stack for coroutine");
657	/*	948	_exit (EXIT_FAILURE);
658	* this is a _very_ stripped down perl interpreter ;)	949	}
659	*/
660	dTHX;
661	Coro__State ctx = (Coro__State)arg;
662		950
663	PL_top_env = &PL_start_env;	951	stack_start = cctx->sptr;
		952	stack_size = cctx->ssize;
		953	}
664		954
665	ctx->cursp = 0;	955	REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);
666	PL_op = PL_op->op_next;	956	coro_create (&cctx->cctx, coro_run, (void *)cctx, stack_start, stack_size);
667	CALLRUNOPS(aTHX);
668		957
669	abort ();	958	return cctx;
670	}	959	}
671		960
672	/* never call directly, always through the coro_state_transfer global variable */
673	static void	961	static void
		962	cctx_destroy (coro_cctx *cctx)
		963	{
		964	if (!cctx)
		965	return;
		966
		967	--cctx_count;
		968
		969	#if CORO_USE_VALGRIND
		970	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		971	#endif
		972
		973	#if HAVE_MMAP
		974	if (cctx->flags & CC_MAPPED)
		975	munmap (cctx->sptr, cctx->ssize);
		976	else
		977	#endif
		978	Safefree (cctx->sptr);
		979
		980	Safefree (cctx);
		981	}
		982
		983	/* wether this cctx should be destructed */
		984	#define CCTX_EXPIRED(cctx) ((cctx)->ssize < coro_stacksize || ((cctx)->flags & CC_NOREUSE))
		985
		986	static coro_cctx *
		987	cctx_get (pTHX)
		988	{
		989	while (expect_true (cctx_first))
		990	{
		991	coro_cctx *cctx = cctx_first;
		992	cctx_first = cctx->next;
		993	--cctx_idle;
		994
		995	if (expect_true (!CCTX_EXPIRED (cctx)))
		996	return cctx;
		997
		998	cctx_destroy (cctx);
		999	}
		1000
		1001	return cctx_new ();
		1002	}
		1003
		1004	static void
		1005	cctx_put (coro_cctx *cctx)
		1006	{
		1007	/* free another cctx if overlimit */
		1008	if (expect_false (cctx_idle >= MAX_IDLE_CCTX))
		1009	{
		1010	coro_cctx *first = cctx_first;
		1011	cctx_first = first->next;
		1012	--cctx_idle;
		1013
		1014	cctx_destroy (first);
		1015	}
		1016
		1017	++cctx_idle;
		1018	cctx->next = cctx_first;
		1019	cctx_first = cctx;
		1020	}
		1021
		1022	/** coroutine switching *****************************************************/
		1023
		1024	static void
		1025	transfer_check (pTHX_ struct coro *prev, struct coro *next)
		1026	{
		1027	if (expect_true (prev != next))
		1028	{
		1029	if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
		1030	croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states");
		1031
		1032	if (expect_false (next->flags & CF_RUNNING))
		1033	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		1034
		1035	if (expect_false (next->flags & CF_DESTROYED))
		1036	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		1037
		1038	if (
		1039	#if PERL_VERSION_ATLEAST (5,9,0)
		1040	expect_false (PL_parser)
		1041	#else
		1042	expect_false (PL_lex_state != LEX_NOTPARSING)
		1043	#endif
		1044	)
		1045	croak ("Coro::State::transfer called while parsing, but this is not supported");
		1046	}
		1047	}
		1048
		1049	/* always use the TRANSFER macro */
		1050	static void NOINLINE
674	transfer_impl (pTHX_ struct coro *prev, struct coro *next, int flags)	1051	transfer (pTHX_ struct coro *prev, struct coro *next)
675	{	1052	{
676	dSTACKLEVEL;	1053	dSTACKLEVEL;
677		1054
678	if (prev != next)	1055	/* sometimes transfer is only called to set idle_sp */
		1056	if (expect_false (!next))
		1057	{
		1058	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		1059	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
679	{	1060	}
680	/* has this coro been created yet? */	1061	else if (expect_true (prev != next))
681	if (next->mainstack)	1062	{
		1063	coro_cctx *prev__cctx;
		1064
		1065	if (expect_false (prev->flags & CF_NEW))
682	{	1066	{
683	LOCK;	1067	/* create a new empty context */
684	SAVE (prev, flags);	1068	Newz (0, prev->cctx, 1, coro_cctx);
685	LOAD (next);	1069	prev->flags &= ~CF_NEW;
686	UNLOCK;	1070	prev->flags |= CF_RUNNING;
687
688	/* mark this state as in-use */
689	next->mainstack = 0;
690	next->tmps_ix = -2;
691
692	/* stacklevel changed? if yes, grab the stack for us! */
693	if (flags & TRANSFER_SAVE_CCTXT)
694	{
695	if (!prev->stack)
696	allocate_stack (prev, 0);
697	else if (prev->cursp != stacklevel
698	&& prev->stack->usecnt > 1)
699	{
700	prev->gencnt = ++prev->stack->gencnt;
701	prev->stack->usecnt = 1;
702	}
703
704	/* has our stack been invalidated? */
705	if (next->stack && next->stack->gencnt != next->gencnt)
706	{
707	deallocate_stack (next);
708	allocate_stack (next, 1);
709	coro_create (&(next->stack->cctx),
710	continue_coro, (void *)next,
711	next->stack->sptr, labs (next->stack->ssize));
712	}
713
714	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
715	prev->cursp = stacklevel;
716	/* don't add any code here */
717	}
718	else
719	next->cursp = stacklevel;
720	}	1071	}
721	else if (next->tmps_ix == -2)	1072
722	croak ("tried to transfer to running coroutine");	1073	prev->flags &= ~CF_RUNNING;
		1074	next->flags |= CF_RUNNING;
		1075
		1076	LOCK;
		1077
		1078	if (expect_false (next->flags & CF_NEW))
		1079	{
		1080	/* need to start coroutine */
		1081	next->flags &= ~CF_NEW;
		1082	/* first get rid of the old state */
		1083	save_perl (aTHX_ prev);
		1084	/* setup coroutine call */
		1085	coro_setup (aTHX_ next);
		1086	}
723	else	1087	else
724	{	1088	{
725	LOCK;	1089	/* coroutine already started */
726	SAVE (prev, -1); /* first get rid of the old state */	1090	save_perl (aTHX_ prev);
		1091	load_perl (aTHX_ next);
		1092	}
		1093
		1094	prev__cctx = prev->cctx;
		1095
		1096	/* possibly "free" the cctx */
		1097	if (expect_true (prev__cctx->idle_sp == STACKLEVEL && !(prev__cctx->flags & CC_TRACE)))
		1098	{
		1099	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		1100	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
		1101
		1102	prev->cctx = 0;
		1103
		1104	/* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
		1105	/* without this the next cctx_get might destroy the prev__cctx while still in use */
		1106	if (expect_false (CCTX_EXPIRED (prev__cctx)))
		1107	next->cctx = cctx_get (aTHX);
		1108
		1109	cctx_put (prev__cctx);
		1110	}
		1111
		1112	++next->usecount;
		1113
		1114	if (expect_true (!next->cctx))
		1115	next->cctx = cctx_get (aTHX);
		1116
		1117	if (expect_false (prev__cctx != next->cctx))
		1118	{
		1119	prev__cctx->top_env = PL_top_env;
		1120	PL_top_env = next->cctx->top_env;
		1121	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		1122	}
		1123
		1124	free_coro_mortal (aTHX);
727	UNLOCK;	1125	UNLOCK;
728		1126
729	/* create the coroutine for the first time */	1127	if (expect_false (prev->throw || next->throw))
730	if (flags & TRANSFER_SAVE_CCTXT)	1128	{
		1129	struct coro *coro = SvSTATE (coro_current);
		1130
		1131	if (coro->throw)
731	{	1132	{
732	if (!prev->stack)	1133	SV *exception = coro->throw;
733	allocate_stack (prev, 0);	1134	coro->throw = 0;
734		1135	sv_setsv (ERRSV, exception);
735	/* the new coroutine starts with start_env again */
736	PL_top_env = &PL_start_env;
737
738	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
739	{
740	setup_coro (next);
741	next->cursp = stacklevel;
742
743	prev->stack->refcnt++;
744	prev->stack->usecnt++;
745	next->stack = prev->stack;
746	next->gencnt = prev->gencnt;
747	}
748	else
749	{
750	assert (!next->stack);
751	allocate_stack (next, 1);
752	coro_create (&(next->stack->cctx),
753	setup_coro, (void *)next,
754	next->stack->sptr, labs (next->stack->ssize));
755	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
756	prev->cursp = stacklevel;
757	/* don't add any code here */
758	}
759	}
760	else
761	{
762	setup_coro (next);	1136	croak (0);
763	next->cursp = stacklevel;
764	}	1137	}
765	}	1138	}
766	}	1139	}
		1140	}
767		1141
768	LOCK;	1142	struct transfer_args
769	if (coro_mortal)	1143	{
770	{	1144	struct coro *prev, *next;
771	SvREFCNT_dec (coro_mortal);	1145	};
772	coro_mortal = 0;	1146
		1147	#define TRANSFER(ta) transfer (aTHX_ (ta).prev, (ta).next)
		1148	#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
		1149
		1150	/** high level stuff ********************************************************/
		1151
		1152	static int
		1153	coro_state_destroy (pTHX_ struct coro *coro)
		1154	{
		1155	if (coro->flags & CF_DESTROYED)
		1156	return 0;
		1157
		1158	coro->flags |= CF_DESTROYED;
		1159
		1160	if (coro->flags & CF_READY)
773	}	1161	{
		1162	/* reduce nready, as destroying a ready coro effectively unreadies it */
		1163	/* alternative: look through all ready queues and remove the coro */
		1164	LOCK;
		1165	--coro_nready;
774	UNLOCK;	1166	UNLOCK;
775	}	1167	}
		1168	else
		1169	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
776		1170
777	/* use this function pointer to call the above function */	1171	if (coro->mainstack && coro->mainstack != main_mainstack)
778	/* this is done to increase chances of the compiler not inlining the call */	1172	{
779	void (*coro_state_transfer)(pTHX_ struct coro *prev, struct coro *next, int flags) = transfer_impl;	1173	struct coro temp;
780		1174
781	#define SV_CORO(sv,func) \	1175	if (coro->flags & CF_RUNNING)
782	do { \	1176	croak ("FATAL: tried to destroy currently running coroutine");
783	if (SvROK (sv)) \
784	sv = SvRV (sv); \
785	\
786	if (SvTYPE (sv) == SVt_PVHV) \
787	{ \
788	HE *he = hv_fetch_ent ((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
789	\
790	if (!he) \
791	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
792	\
793	(sv) = SvRV (HeVAL(he)); \
794	} \
795	\
796	/* must also be changed inside Coro::Cont::yield */ \
797	if (!SvOBJECT (sv) || SvSTASH (sv) != coro_state_stash) \
798	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
799	\
800	} while(0)
801		1177
802	#define SvSTATE(sv) INT2PTR (struct coro *, SvIVX (sv))	1178	save_perl (aTHX_ &temp);
		1179	load_perl (aTHX_ coro);
803		1180
		1181	coro_destroy (aTHX_ coro);
		1182
		1183	load_perl (aTHX_ &temp);
		1184
		1185	coro->slot = 0;
		1186	}
		1187
		1188	cctx_destroy (coro->cctx);
		1189	SvREFCNT_dec (coro->args);
		1190
		1191	if (coro->next) coro->next->prev = coro->prev;
		1192	if (coro->prev) coro->prev->next = coro->next;
		1193	if (coro == coro_first) coro_first = coro->next;
		1194
		1195	return 1;
		1196	}
		1197
804	static void	1198	static int
		1199	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
		1200	{
		1201	struct coro *coro = (struct coro *)mg->mg_ptr;
		1202	mg->mg_ptr = 0;
		1203
		1204	coro->hv = 0;
		1205
		1206	if (--coro->refcnt < 0)
		1207	{
		1208	coro_state_destroy (aTHX_ coro);
		1209	Safefree (coro);
		1210	}
		1211
		1212	return 0;
		1213	}
		1214
		1215	static int
		1216	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		1217	{
		1218	struct coro *coro = (struct coro *)mg->mg_ptr;
		1219
		1220	++coro->refcnt;
		1221
		1222	return 0;
		1223	}
		1224
		1225	static MGVTBL coro_state_vtbl = {
		1226	0, 0, 0, 0,
		1227	coro_state_free,
		1228	0,
		1229	#ifdef MGf_DUP
		1230	coro_state_dup,
		1231	#else
		1232	# define MGf_DUP 0
		1233	#endif
		1234	};
		1235
		1236	static void
		1237	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		1238	{
		1239	ta->prev = SvSTATE (prev_sv);
		1240	ta->next = SvSTATE (next_sv);
		1241	TRANSFER_CHECK (*ta);
		1242	}
		1243
		1244	static void
805	api_transfer (pTHX_ SV *prev, SV *next, int flags)	1245	api_transfer (SV *prev_sv, SV *next_sv)
806	{	1246	{
807	SV_CORO (prev, "Coro::transfer");	1247	dTHX;
808	SV_CORO (next, "Coro::transfer");	1248	struct transfer_args ta;
809		1249
810	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1250	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
		1251	TRANSFER (ta);
811	}	1252	}
812		1253
813	/** Coro ********************************************************************/	1254	/** Coro ********************************************************************/
814		1255
815	#define PRIO_MAX 3
816	#define PRIO_HIGH 1
817	#define PRIO_NORMAL 0
818	#define PRIO_LOW -1
819	#define PRIO_IDLE -3
820	#define PRIO_MIN -4
821
822	/* for Coro.pm */
823	static GV *coro_current, *coro_idle;
824	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
825	static int coro_nready;
826
827	static void	1256	static void
828	coro_enq (pTHX_ SV *sv)	1257	coro_enq (pTHX_ SV *coro_sv)
829	{	1258	{
830	SV **xprio;
831	int prio;
832
833	if (SvTYPE (sv) != SVt_PVHV)
834	croak ("Coro::ready tried to enqueue something that is not a coroutine");
835
836	xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
837	prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
838
839	prio = prio > PRIO_MAX ? PRIO_MAX
840	: prio < PRIO_MIN ? PRIO_MIN
841	: prio;
842
843	av_push (coro_ready [prio - PRIO_MIN], sv);	1259	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
844	coro_nready++;
845	}	1260	}
846		1261
847	static SV *	1262	static SV *
848	coro_deq (pTHX_ int min_prio)	1263	coro_deq (pTHX_ int min_prio)
849	{	1264	{
…		…
853	if (min_prio < 0)	1268	if (min_prio < 0)
854	min_prio = 0;	1269	min_prio = 0;
855		1270
856	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	1271	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
857	if (AvFILLp (coro_ready [prio]) >= 0)	1272	if (AvFILLp (coro_ready [prio]) >= 0)
858	{
859	coro_nready--;
860	return av_shift (coro_ready [prio]);	1273	return av_shift (coro_ready [prio]);
861	}
862		1274
863	return 0;	1275	return 0;
864	}	1276	}
865		1277
866	static void	1278	static int
867	api_ready (SV *coro)	1279	api_ready (SV *coro_sv)
868	{	1280	{
869	dTHX;	1281	dTHX;
		1282	struct coro *coro;
870		1283
871	if (SvROK (coro))	1284	if (SvROK (coro_sv))
872	coro = SvRV (coro);	1285	coro_sv = SvRV (coro_sv);
		1286
		1287	coro = SvSTATE (coro_sv);
		1288
		1289	if (coro->flags & CF_READY)
		1290	return 0;
		1291
		1292	coro->flags |= CF_READY;
873		1293
874	LOCK;	1294	LOCK;
875	coro_enq (aTHX_ SvREFCNT_inc (coro));	1295	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
		1296	++coro_nready;
876	UNLOCK;	1297	UNLOCK;
		1298
		1299	return 1;
		1300	}
		1301
		1302	static int
		1303	api_is_ready (SV *coro_sv)
		1304	{
		1305	dTHX;
		1306	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		1307	}
		1308
		1309	static void
		1310	prepare_schedule (pTHX_ struct transfer_args *ta)
		1311	{
		1312	SV *prev_sv, *next_sv;
		1313
		1314	for (;;)
		1315	{
		1316	LOCK;
		1317	next_sv = coro_deq (aTHX_ PRIO_MIN);
		1318
		1319	/* nothing to schedule: call the idle handler */
		1320	if (expect_false (!next_sv))
		1321	{
		1322	dSP;
		1323	UNLOCK;
		1324
		1325	ENTER;
		1326	SAVETMPS;
		1327
		1328	PUSHMARK (SP);
		1329	PUTBACK;
		1330	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1331
		1332	FREETMPS;
		1333	LEAVE;
		1334	continue;
		1335	}
		1336
		1337	ta->next = SvSTATE (next_sv);
		1338
		1339	/* cannot transfer to destroyed coros, skip and look for next */
		1340	if (expect_false (ta->next->flags & CF_DESTROYED))
		1341	{
		1342	UNLOCK;
		1343	SvREFCNT_dec (next_sv);
		1344	/* coro_nready is already taken care of by destroy */
		1345	continue;
		1346	}
		1347
		1348	--coro_nready;
		1349	UNLOCK;
		1350	break;
		1351	}
		1352
		1353	/* free this only after the transfer */
		1354	prev_sv = SvRV (coro_current);
		1355	ta->prev = SvSTATE (prev_sv);
		1356	TRANSFER_CHECK (*ta);
		1357	assert (ta->next->flags & CF_READY);
		1358	ta->next->flags &= ~CF_READY;
		1359	SvRV_set (coro_current, next_sv);
		1360
		1361	LOCK;
		1362	free_coro_mortal (aTHX);
		1363	coro_mortal = prev_sv;
		1364	UNLOCK;
		1365	}
		1366
		1367	static void
		1368	prepare_cede (pTHX_ struct transfer_args *ta)
		1369	{
		1370	api_ready (coro_current);
		1371	prepare_schedule (aTHX_ ta);
		1372	}
		1373
		1374	static int
		1375	prepare_cede_notself (pTHX_ struct transfer_args *ta)
		1376	{
		1377	if (coro_nready)
		1378	{
		1379	SV *prev = SvRV (coro_current);
		1380	prepare_schedule (aTHX_ ta);
		1381	api_ready (prev);
		1382	return 1;
		1383	}
		1384	else
		1385	return 0;
877	}	1386	}
878		1387
879	static void	1388	static void
880	api_schedule (void)	1389	api_schedule (void)
881	{	1390	{
882	dTHX;	1391	dTHX;
		1392	struct transfer_args ta;
883		1393
884	SV *prev, *next;	1394	prepare_schedule (aTHX_ &ta);
885		1395	TRANSFER (ta);
886	LOCK;
887
888	prev = SvRV (GvSV (coro_current));
889	next = coro_deq (aTHX_ PRIO_MIN);
890
891	if (!next)
892	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
893
894	/* free this only after the transfer */
895	coro_mortal = prev;
896	SV_CORO (prev, "Coro::schedule");
897
898	SvRV (GvSV (coro_current)) = next;
899
900	SV_CORO (next, "Coro::schedule");
901
902	UNLOCK;
903
904	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
905	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
906	}	1396	}
907		1397
908	static void	1398	static int
909	api_cede (void)	1399	api_cede (void)
910	{	1400	{
911	dTHX;	1401	dTHX;
		1402	struct transfer_args ta;
912		1403
913	LOCK;	1404	prepare_cede (aTHX_ &ta);
914	coro_enq (aTHX_ SvREFCNT_inc (SvRV (GvSV (coro_current))));
915	UNLOCK;
916		1405
917	api_schedule ();	1406	if (expect_true (ta.prev != ta.next))
		1407	{
		1408	TRANSFER (ta);
		1409	return 1;
		1410	}
		1411	else
		1412	return 0;
918	}	1413	}
919		1414
		1415	static int
		1416	api_cede_notself (void)
		1417	{
		1418	dTHX;
		1419	struct transfer_args ta;
		1420
		1421	if (prepare_cede_notself (aTHX_ &ta))
		1422	{
		1423	TRANSFER (ta);
		1424	return 1;
		1425	}
		1426	else
		1427	return 0;
		1428	}
		1429
		1430	static void
		1431	api_trace (SV *coro_sv, int flags)
		1432	{
		1433	dTHX;
		1434	struct coro *coro = SvSTATE (coro_sv);
		1435
		1436	if (flags & CC_TRACE)
		1437	{
		1438	if (!coro->cctx)
		1439	coro->cctx = cctx_new ();
		1440	else if (!(coro->cctx->flags & CC_TRACE))
		1441	croak ("cannot enable tracing on coroutine with custom stack");
		1442
		1443	coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
		1444	}
		1445	else if (coro->cctx && coro->cctx->flags & CC_TRACE)
		1446	{
		1447	coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
		1448
		1449	if (coro->flags & CF_RUNNING)
		1450	PL_runops = RUNOPS_DEFAULT;
		1451	else
		1452	coro->slot->runops = RUNOPS_DEFAULT;
		1453	}
		1454	}
		1455
920	MODULE = Coro::State PACKAGE = Coro::State	1456	MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
921		1457
922	PROTOTYPES: ENABLE	1458	PROTOTYPES: DISABLE
923		1459
924	BOOT:	1460	BOOT:
925	{ /* {} necessary for stoopid perl-5.6.x */	1461	{
926	#ifdef USE_ITHREADS	1462	#ifdef USE_ITHREADS
927	MUTEX_INIT (&coro_mutex);	1463	MUTEX_INIT (&coro_mutex);
928	#endif	1464	#endif
929	BOOT_PAGESIZE;	1465	BOOT_PAGESIZE;
930		1466
931	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1467	irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
932	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1468	stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
		1469
933	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1470	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
934		1471
935	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1472	newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
936	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1473	newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
937	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1474	newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
938	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1475	newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
939		1476
940	main_mainstack = PL_mainstack;	1477	main_mainstack = PL_mainstack;
		1478	main_top_env = PL_top_env;
		1479
		1480	while (main_top_env->je_prev)
		1481	main_top_env = main_top_env->je_prev;
941		1482
942	coroapi.ver = CORO_API_VERSION;	1483	coroapi.ver = CORO_API_VERSION;
943	coroapi.transfer = api_transfer;	1484	coroapi.transfer = api_transfer;
944	}
945		1485
946	Coro::State	1486	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
947	_newprocess(args)	1487	}
948	SV * args	1488
949	PROTOTYPE: $	1489	SV *
		1490	new (char *klass, ...)
950	CODE:	1491	CODE:
951	Coro__State coro;	1492	{
		1493	struct coro *coro;
		1494	HV *hv;
		1495	int i;
952		1496
953	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
954	croak ("Coro::State::_newprocess expects an arrayref");
955
956	Newz (0, coro, 1, struct coro);	1497	Newz (0, coro, 1, struct coro);
		1498	coro->args = newAV ();
		1499	coro->flags = CF_NEW;
957		1500
958	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1501	if (coro_first) coro_first->prev = coro;
959	/*coro->mainstack = 0; *//*actual work is done inside transfer */	1502	coro->next = coro_first;
960	/*coro->stack = 0;*/	1503	coro_first = coro;
961		1504
962	RETVAL = coro;	1505	coro->hv = hv = newHV ();
		1506	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
		1507	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		1508
		1509	av_extend (coro->args, items - 1);
		1510	for (i = 1; i < items; i++)
		1511	av_push (coro->args, newSVsv (ST (i)));
		1512	}
963	OUTPUT:	1513	OUTPUT:
964	RETVAL	1514	RETVAL
965		1515
		1516	# these not obviously related functions are all rolled into the same xs
		1517	# function to increase chances that they all will call transfer with the same
		1518	# stack offset
966	void	1519	void
967	transfer(prev, next, flags)	1520	_set_stacklevel (...)
968	SV *prev	1521	ALIAS:
969	SV *next	1522	Coro::State::transfer = 1
970	int flags	1523	Coro::schedule = 2
971	PROTOTYPE: @	1524	Coro::cede = 3
		1525	Coro::cede_notself = 4
972	CODE:	1526	CODE:
973	PUTBACK;	1527	{
974	SV_CORO (next, "Coro::transfer");	1528	struct transfer_args ta;
975	SV_CORO (prev, "Coro::transfer");	1529
976	coro_state_transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1530	switch (ix)
977	SPAGAIN;	1531	{
		1532	case 0:
		1533	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1534	ta.next = 0;
		1535	break;
		1536
		1537	case 1:
		1538	if (items != 2)
		1539	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1540
		1541	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
		1542	break;
		1543
		1544	case 2:
		1545	prepare_schedule (aTHX_ &ta);
		1546	break;
		1547
		1548	case 3:
		1549	prepare_cede (aTHX_ &ta);
		1550	break;
		1551
		1552	case 4:
		1553	if (!prepare_cede_notself (aTHX_ &ta))
		1554	XSRETURN_EMPTY;
		1555
		1556	break;
		1557	}
		1558
		1559	BARRIER;
		1560	TRANSFER (ta);
		1561
		1562	if (expect_false (GIMME_V != G_VOID && ta.next != ta.prev))
		1563	XSRETURN_YES;
		1564	}
		1565
		1566	bool
		1567	_destroy (SV *coro_sv)
		1568	CODE:
		1569	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
		1570	OUTPUT:
		1571	RETVAL
978		1572
979	void	1573	void
980	DESTROY(coro)
981	Coro::State coro
982	CODE:
983
984	if (coro->mainstack && coro->mainstack != main_mainstack)
985	{
986	struct coro temp;
987
988	PUTBACK;
989	SAVE (aTHX_ (&temp), TRANSFER_SAVE_ALL);
990	LOAD (aTHX_ coro);
991	SPAGAIN;
992
993	destroy_stacks (aTHX);
994
995	LOAD ((&temp)); /* this will get rid of defsv etc.. */
996	SPAGAIN;
997
998	coro->mainstack = 0;
999	}
1000
1001	deallocate_stack (coro);
1002	SvREFCNT_dec (coro->args);
1003	Safefree (coro);
1004
1005	void
1006	_exit(code)	1574	_exit (code)
1007	int code	1575	int code
1008	PROTOTYPE: $	1576	PROTOTYPE: $
1009	CODE:	1577	CODE:
1010	_exit (code);	1578	_exit (code);
1011		1579
1012	MODULE = Coro::State PACKAGE = Coro::Cont	1580	int
		1581	cctx_stacksize (int new_stacksize = 0)
		1582	CODE:
		1583	RETVAL = coro_stacksize;
		1584	if (new_stacksize)
		1585	coro_stacksize = new_stacksize;
		1586	OUTPUT:
		1587	RETVAL
		1588
		1589	int
		1590	cctx_count ()
		1591	CODE:
		1592	RETVAL = cctx_count;
		1593	OUTPUT:
		1594	RETVAL
		1595
		1596	int
		1597	cctx_idle ()
		1598	CODE:
		1599	RETVAL = cctx_idle;
		1600	OUTPUT:
		1601	RETVAL
1013		1602
1014	void	1603	void
1015	yield(...)	1604	list ()
1016	PROTOTYPE: @	1605	PPCODE:
		1606	{
		1607	struct coro *coro;
		1608	for (coro = coro_first; coro; coro = coro->next)
		1609	if (coro->hv)
		1610	XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
		1611	}
		1612
		1613	void
		1614	call (Coro::State coro, SV *coderef)
		1615	ALIAS:
		1616	eval = 1
		1617	CODE:
		1618	{
		1619	if (coro->mainstack)
		1620	{
		1621	struct coro temp;
		1622
		1623	if (!(coro->flags & CF_RUNNING))
		1624	{
		1625	save_perl (aTHX_ &temp);
		1626	load_perl (aTHX_ coro);
		1627	}
		1628
		1629	{
		1630	dSP;
		1631	ENTER;
		1632	SAVETMPS;
		1633	PUSHMARK (SP);
		1634	PUTBACK;
		1635
		1636	if (ix)
		1637	eval_sv (coderef, 0);
		1638	else
		1639	call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		1640
		1641	SPAGAIN;
		1642	FREETMPS;
		1643	LEAVE;
		1644	PUTBACK;
		1645	}
		1646
		1647	if (!(coro->flags & CF_RUNNING))
		1648	{
		1649	save_perl (aTHX_ coro);
		1650	load_perl (aTHX_ &temp);
		1651	}
		1652	}
		1653	}
		1654
		1655	SV *
		1656	is_ready (Coro::State coro)
		1657	PROTOTYPE: $
		1658	ALIAS:
		1659	is_ready = CF_READY
		1660	is_running = CF_RUNNING
		1661	is_new = CF_NEW
		1662	is_destroyed = CF_DESTROYED
		1663	CODE:
		1664	RETVAL = boolSV (coro->flags & ix);
		1665	OUTPUT:
		1666	RETVAL
		1667
		1668	void
		1669	api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
		1670
		1671	SV *
		1672	has_stack (Coro::State coro)
		1673	PROTOTYPE: $
		1674	CODE:
		1675	RETVAL = boolSV (!!coro->cctx);
		1676	OUTPUT:
		1677	RETVAL
		1678
		1679	int
		1680	is_traced (Coro::State coro)
		1681	PROTOTYPE: $
		1682	CODE:
		1683	RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
		1684	OUTPUT:
		1685	RETVAL
		1686
		1687	IV
		1688	rss (Coro::State coro)
		1689	PROTOTYPE: $
		1690	ALIAS:
		1691	usecount = 1
1017	CODE:	1692	CODE:
1018	SV *yieldstack;	1693	switch (ix)
1019	SV *sv;	1694	{
1020	AV *defav = GvAV (PL_defgv);	1695	case 0: RETVAL = coro_rss (aTHX_ coro); break;
1021	struct coro *prev, *next;	1696	case 1: RETVAL = coro->usecount; break;
1022
1023	yieldstack = *hv_fetch (
1024	(HV *)SvRV (GvSV (coro_current)),
1025	"yieldstack", sizeof ("yieldstack") - 1,
1026	0	1697	}
1027	);	1698	OUTPUT:
		1699	RETVAL
1028		1700
1029	/* set up @_ -- ugly */
1030	av_clear (defav);
1031	av_fill (defav, items - 1);
1032	while (items--)
1033	av_store (defav, items, SvREFCNT_inc (ST(items)));
1034
1035	sv = av_pop ((AV *)SvRV (yieldstack));
1036	prev = SvSTATE ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
1037	next = SvSTATE ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
1038	SvREFCNT_dec (sv);
1039
1040	coro_state_transfer (aTHX_ prev, next, 0);
1041		1701
1042	MODULE = Coro::State PACKAGE = Coro	1702	MODULE = Coro::State PACKAGE = Coro
1043		1703
1044	BOOT:	1704	BOOT:
1045	{	1705	{
1046	int i;	1706	int i;
		1707
		1708	sv_pool_rss = get_sv ("Coro::POOL_RSS" , TRUE);
		1709	get_sv ("Coro::POOL_RSS" , TRUE); /* silence stupid 5.10 warning */
		1710	sv_pool_size = get_sv ("Coro::POOL_SIZE" , TRUE);
		1711	get_sv ("Coro::POOL_SIZE" , TRUE); /* silence stupid 5.10 warning */
		1712	av_async_pool = get_av ("Coro::async_pool", TRUE);
		1713	get_av ("Coro::async_pool", TRUE); /* silence stupid 5.10 warning */
		1714
		1715	coro_current = get_sv ("Coro::current", FALSE);
		1716	SvREADONLY_on (coro_current);
		1717
1047	HV *stash = gv_stashpv ("Coro", TRUE);	1718	coro_stash = gv_stashpv ("Coro", TRUE);
1048		1719
1049	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1720	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1050	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1721	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1051	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1722	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1052	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1723	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1053	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1724	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1054	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1725	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1055
1056	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1057	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1058		1726
1059	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1727	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1060	coro_ready[i] = newAV ();	1728	coro_ready[i] = newAV ();
1061		1729
1062	{	1730	{
1063	SV *sv = perl_get_sv("Coro::API", 1);	1731	SV *sv = perl_get_sv ("Coro::API", TRUE);
		1732	perl_get_sv ("Coro::API", TRUE); /* silence 5.10 warning */
1064		1733
1065	coroapi.schedule = api_schedule;	1734	coroapi.schedule = api_schedule;
1066	coroapi.cede = api_cede;	1735	coroapi.cede = api_cede;
		1736	coroapi.cede_notself = api_cede_notself;
1067	coroapi.ready = api_ready;	1737	coroapi.ready = api_ready;
		1738	coroapi.is_ready = api_is_ready;
1068	coroapi.nready = &coro_nready;	1739	coroapi.nready = &coro_nready;
1069	coroapi.current = coro_current;	1740	coroapi.current = coro_current;
1070		1741
1071	GCoroAPI = &coroapi;	1742	GCoroAPI = &coroapi;
1072	sv_setiv (sv, (IV)&coroapi);	1743	sv_setiv (sv, (IV)&coroapi);
1073	SvREADONLY_on (sv);	1744	SvREADONLY_on (sv);
1074	}	1745	}
1075	}	1746	}
1076		1747
1077	#if !PERL_MICRO
1078
1079	void	1748	void
1080	ready(self)	1749	_set_current (SV *current)
1081	SV * self
1082	PROTOTYPE: $	1750	PROTOTYPE: $
1083	CODE:	1751	CODE:
1084	api_ready (self);	1752	SvREFCNT_dec (SvRV (coro_current));
1085		1753	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1086	#endif
1087		1754
1088	int	1755	int
		1756	prio (Coro::State coro, int newprio = 0)
		1757	ALIAS:
		1758	nice = 1
		1759	CODE:
		1760	{
		1761	RETVAL = coro->prio;
		1762
		1763	if (items > 1)
		1764	{
		1765	if (ix)
		1766	newprio = coro->prio - newprio;
		1767
		1768	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1769	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1770
		1771	coro->prio = newprio;
		1772	}
		1773	}
		1774	OUTPUT:
		1775	RETVAL
		1776
		1777	SV *
		1778	ready (SV *self)
		1779	PROTOTYPE: $
		1780	CODE:
		1781	RETVAL = boolSV (api_ready (self));
		1782	OUTPUT:
		1783	RETVAL
		1784
		1785	int
1089	nready(...)	1786	nready (...)
1090	PROTOTYPE:	1787	PROTOTYPE:
1091	CODE:	1788	CODE:
1092	RETVAL = coro_nready;	1789	RETVAL = coro_nready;
1093	OUTPUT:	1790	OUTPUT:
1094	RETVAL	1791	RETVAL
1095		1792
1096	void	1793	void
1097	schedule(...)	1794	throw (Coro::State self, SV *throw = &PL_sv_undef)
1098	PROTOTYPE:	1795	PROTOTYPE: $;$
		1796	CODE:
		1797	SvREFCNT_dec (self->throw);
		1798	self->throw = SvOK (throw) ? newSVsv (throw) : 0;
		1799
		1800	# for async_pool speedup
		1801	void
		1802	_pool_1 (SV *cb)
1099	CODE:	1803	CODE:
1100	api_schedule ();	1804	{
		1805	struct coro *coro = SvSTATE (coro_current);
		1806	HV *hv = (HV *)SvRV (coro_current);
		1807	AV *defav = GvAV (PL_defgv);
		1808	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
		1809	AV *invoke_av;
		1810	int i, len;
		1811
		1812	if (!invoke)
		1813	croak ("\3async_pool terminate\2\n");
		1814
		1815	SvREFCNT_dec (coro->saved_deffh);
		1816	coro->saved_deffh = SvREFCNT_inc ((SV *)PL_defoutgv);
		1817
		1818	hv_store (hv, "desc", sizeof ("desc") - 1,
		1819	newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
		1820
		1821	invoke_av = (AV *)SvRV (invoke);
		1822	len = av_len (invoke_av);
		1823
		1824	sv_setsv (cb, AvARRAY (invoke_av)[0]);
		1825
		1826	if (len > 0)
		1827	{
		1828	av_fill (defav, len - 1);
		1829	for (i = 0; i < len; ++i)
		1830	av_store (defav, i, SvREFCNT_inc (AvARRAY (invoke_av)[i + 1]));
		1831	}
		1832
		1833	SvREFCNT_dec (invoke);
		1834	}
1101		1835
1102	void	1836	void
1103	cede(...)	1837	_pool_2 (SV *cb)
1104	PROTOTYPE:
1105	CODE:	1838	CODE:
1106	api_cede ();	1839	{
		1840	struct coro *coro = SvSTATE (coro_current);
1107		1841
1108	# and these are hacks	1842	sv_setsv (cb, &PL_sv_undef);
		1843
		1844	SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
		1845	coro->saved_deffh = 0;
		1846
		1847	if (coro_rss (aTHX_ coro) > SvIV (sv_pool_rss)
		1848	|| av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
		1849	croak ("\3async_pool terminate\2\n");
		1850
		1851	av_clear (GvAV (PL_defgv));
		1852	hv_store ((HV *)SvRV (coro_current), "desc", sizeof ("desc") - 1,
		1853	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
		1854
		1855	coro->prio = 0;
		1856
		1857	if (coro->cctx && (coro->cctx->flags & CC_TRACE))
		1858	api_trace (coro_current, 0);
		1859
		1860	av_push (av_async_pool, newSVsv (coro_current));
		1861	}
		1862
		1863
		1864	MODULE = Coro::State PACKAGE = Coro::AIO
		1865
1109	SV *	1866	SV *
1110	_aio_get_state ()	1867	_get_state ()
1111	CODE:	1868	CODE:
1112	{	1869	{
1113	struct {	1870	struct io_state *data;
1114	int errorno;
1115	int laststype;
1116	int laststatval;
1117	Stat_t statcache;
1118	} data;
1119		1871
		1872	RETVAL = newSV (sizeof (struct io_state));
		1873	data = (struct io_state *)SvPVX (RETVAL);
		1874	SvCUR_set (RETVAL, sizeof (struct io_state));
		1875	SvPOK_only (RETVAL);
		1876
1120	data.errorno = errno;	1877	data->errorno = errno;
1121	data.laststype = PL_laststype;	1878	data->laststype = PL_laststype;
1122	data.laststatval = PL_laststatval;	1879	data->laststatval = PL_laststatval;
1123	data.statcache = PL_statcache;	1880	data->statcache = PL_statcache;
1124
1125	RETVAL = newSVpvn ((char *)&data, sizeof data);
1126	}	1881	}
1127	OUTPUT:	1882	OUTPUT:
1128	RETVAL	1883	RETVAL
1129		1884
1130	void	1885	void
1131	_aio_set_state (char *data_)	1886	_set_state (char *data_)
1132	PROTOTYPE: $	1887	PROTOTYPE: $
1133	CODE:	1888	CODE:
1134	{	1889	{
1135	struct {	1890	struct io_state *data = (void *)data_;
1136	int errorno;
1137	int laststype;
1138	int laststatval;
1139	Stat_t statcache;
1140	} *data = (void *)data_;
1141		1891
1142	errno = data->errorno;	1892	errno = data->errorno;
1143	PL_laststype = data->laststype;	1893	PL_laststype = data->laststype;
1144	PL_laststatval = data->laststatval;	1894	PL_laststatval = data->laststatval;
1145	PL_statcache = data->statcache;	1895	PL_statcache = data->statcache;
1146	}	1896	}
		1897

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