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Comparing Coro/Coro/State.xs (file contents):
Revision 1.44 by root, Sat Mar 22 18:50:32 2003 UTC vs.
Revision 1.162 by root, Sun Sep 23 21:49:58 2007 UTC

		1	#include "libcoro/coro.c"
		2
		3	#define PERL_NO_GET_CONTEXT
		4
1	#include "EXTERN.h"	5	#include "EXTERN.h"
2	#include "perl.h"	6	#include "perl.h"
3	#include "XSUB.h"	7	#include "XSUB.h"
4		8
5	#include "libcoro/coro.c"	9	#include "patchlevel.h"
6		10
7	#include <signal.h>	11	#include <stdio.h>
		12	#include <errno.h>
		13	#include <assert.h>
8		14
9	#ifdef HAVE_MMAP	15	#ifdef HAVE_MMAP
10	# include <unistd.h>	16	# include <unistd.h>
11	# include <sys/mman.h>	17	# include <sys/mman.h>
12	# ifndef MAP_ANONYMOUS	18	# ifndef MAP_ANONYMOUS
…		…
14	# define MAP_ANONYMOUS MAP_ANON	20	# define MAP_ANONYMOUS MAP_ANON
15	# else	21	# else
16	# undef HAVE_MMAP	22	# undef HAVE_MMAP
17	# endif	23	# endif
18	# endif	24	# endif
		25	# include <limits.h>
		26	# ifndef PAGESIZE
		27	# define PAGESIZE pagesize
		28	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		29	static long pagesize;
		30	# else
		31	# define BOOT_PAGESIZE (void)0
19	#endif	32	# endif
		33	#else
		34	# define PAGESIZE 0
		35	# define BOOT_PAGESIZE (void)0
		36	#endif
20		37
21	#define MAY_FLUSH /* increases codesize and is rarely used */	38	#if CORO_USE_VALGRIND
		39	# include <valgrind/valgrind.h>
		40	# define REGISTER_STACK(cctx,start,end) (cctx)->valgrind_id = VALGRIND_STACK_REGISTER ((start), (end))
		41	#else
		42	# define REGISTER_STACK(cctx,start,end)
		43	#endif
22		44
23	#define SUB_INIT "Coro::State::initialize"	45	/* the maximum number of idle cctx that will be pooled */
24	#define UCORO_STATE "_coro_state"	46	#define MAX_IDLE_CCTX 8
25		47
26	/* The next macro should declare a variable stacklevel that contains and approximation	48	#define PERL_VERSION_ATLEAST(a,b,c) \
27	* to the current C stack pointer. Its property is that it changes with each call	49	(PERL_REVISION > (a) \
28	* and should be unique. */	50	|| (PERL_REVISION == (a) \
		51	&& (PERL_VERSION > (b) \
		52	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		53
		54	#if !PERL_VERSION_ATLEAST (5,6,0)
		55	# ifndef PL_ppaddr
		56	# define PL_ppaddr ppaddr
		57	# endif
		58	# ifndef call_sv
		59	# define call_sv perl_call_sv
		60	# endif
		61	# ifndef get_sv
		62	# define get_sv perl_get_sv
		63	# endif
		64	# ifndef get_cv
		65	# define get_cv perl_get_cv
		66	# endif
		67	# ifndef IS_PADGV
		68	# define IS_PADGV(v) 0
		69	# endif
		70	# ifndef IS_PADCONST
		71	# define IS_PADCONST(v) 0
		72	# endif
		73	#endif
		74
		75	/* 5.8.7 */
		76	#ifndef SvRV_set
		77	# define SvRV_set(s,v) SvRV(s) = (v)
		78	#endif
		79
		80	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		81	# undef CORO_STACKGUARD
		82	#endif
		83
		84	#ifndef CORO_STACKGUARD
		85	# define CORO_STACKGUARD 0
		86	#endif
		87
		88	/* prefer perl internal functions over our own? */
		89	#ifndef CORO_PREFER_PERL_FUNCTIONS
		90	# define CORO_PREFER_PERL_FUNCTIONS 0
		91	#endif
		92
		93	/* The next macros try to return the current stack pointer, in an as
		94	* portable way as possible. */
		95	#define dSTACKLEVEL volatile char stacklevel
29	#define dSTACKLEVEL void *stacklevel = &stacklevel	96	#define STACKLEVEL ((void *)&stacklevel)
30		97
31	#define IN_DESTRUCT (PL_main_cv == Nullcv)	98	#define IN_DESTRUCT (PL_main_cv == Nullcv)
32		99
33	#define labs(l) ((l) >= 0 ? (l) : -(l))	100	#if __GNUC__ >= 3
		101	# define attribute(x) __attribute__(x)
		102	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		103	#else
		104	# define attribute(x)
		105	# define BARRIER
		106	#endif
		107
		108	#define NOINLINE attribute ((noinline))
34		109
35	#include "CoroAPI.h"	110	#include "CoroAPI.h"
36		111
		112	#ifdef USE_ITHREADS
		113	static perl_mutex coro_mutex;
		114	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		115	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		116	#else
		117	# define LOCK (void)0
		118	# define UNLOCK (void)0
		119	#endif
		120
		121	/* helper storage struct for Coro::AIO */
		122	struct io_state
		123	{
		124	int errorno;
		125	I32 laststype;
		126	int laststatval;
		127	Stat_t statcache;
		128	};
		129
		130	static size_t coro_stacksize = CORO_STACKSIZE;
37	static struct CoroAPI coroapi;	131	static struct CoroAPI coroapi;
		132	static AV *main_mainstack; /* used to differentiate between $main and others */
		133	static JMPENV *main_top_env;
		134	static HV *coro_state_stash, *coro_stash;
		135	static SV *coro_mortal; /* will be freed after next transfer */
38		136
39	/* this is actually not only the c stack but also c registers etc... */	137	/* async_pool helper stuff */
		138	static SV *sv_pool_rss;
		139	static SV *sv_pool_size;
		140	static AV *av_async_pool;
		141
		142	static struct coro_cctx *cctx_first;
		143	static int cctx_count, cctx_idle;
		144
		145	/* this is a structure representing a c-level coroutine */
40	typedef struct {	146	typedef struct coro_cctx {
41	int refcnt; /* pointer reference counter */	147	struct coro_cctx *next;
42	int usecnt; /* shared by how many coroutines */
43	int gencnt; /* generation counter */
44		148
		149	/* the stack */
		150	void *sptr;
		151	size_t ssize;
		152
		153	/* cpu state */
		154	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		155	JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
		156	JMPENV *top_env;
45	coro_context cctx;	157	coro_context cctx;
46		158
47	void *sptr;	159	#if CORO_USE_VALGRIND
48	long ssize; /* positive == mmap, otherwise malloc */	160	int valgrind_id;
49	} coro_stack;	161	#endif
		162	char inuse, mapped;
		163	} coro_cctx;
50		164
		165	enum {
		166	CF_RUNNING = 0x0001, /* coroutine is running */
		167	CF_READY = 0x0002, /* coroutine is ready */
		168	CF_NEW = 0x0004, /* has never been switched to */
		169	CF_DESTROYED = 0x0008, /* coroutine data has been freed */
		170	};
		171
		172	/* this is a structure representing a perl-level coroutine */
51	struct coro {	173	struct coro {
52	/* the optional C context */	174	/* the c coroutine allocated to this perl coroutine, if any */
53	coro_stack *stack;	175	coro_cctx *cctx;
54	void *cursp;
55	int gencnt;
56
57	/* optionally saved, might be zero */
58	AV *defav;
59	SV *defsv;
60	SV *errsv;
61
62	/* saved global state not related to stacks */
63	U8 dowarn;
64	I32 in_eval;
65
66	/* the stacks and related info (callchain etc..) */
67	PERL_SI *curstackinfo;
68	AV *curstack;
69	AV *mainstack;
70	SV **stack_sp;
71	OP *op;
72	SV **curpad;
73	AV *comppad;
74	SV **stack_base;
75	SV **stack_max;
76	SV **tmps_stack;
77	I32 tmps_floor;
78	I32 tmps_ix;
79	I32 tmps_max;
80	I32 *markstack;
81	I32 *markstack_ptr;
82	I32 *markstack_max;
83	I32 *scopestack;
84	I32 scopestack_ix;
85	I32 scopestack_max;
86	ANY *savestack;
87	I32 savestack_ix;
88	I32 savestack_max;
89	OP **retstack;
90	I32 retstack_ix;
91	I32 retstack_max;
92	COP *curcop;
93	JMPENV *top_env;
94		176
95	/* data associated with this coroutine (initial args) */	177	/* data associated with this coroutine (initial args) */
96	AV *args;	178	AV *args;
		179	int refcnt;
		180	int save; /* CORO_SAVE flags */
		181	int flags; /* CF_ flags */
		182
		183	/* optionally saved, might be zero */
		184	AV *defav; /* @_ */
		185	SV *defsv; /* $_ */
		186	SV *errsv; /* $@ */
		187	GV *deffh; /* default filehandle */
		188	SV *irssv; /* $/ */
		189	SV *irssv_sv; /* real $/ cache */
		190
		191	#define VAR(name,type) type name;
		192	# include "state.h"
		193	#undef VAR
		194
		195	/* coro process data */
		196	int prio;
		197
		198	/* linked list */
		199	struct coro *next, *prev;
		200	HV *hv; /* the perl hash associated with this coro, if any */
97	};	201	};
98		202
99	typedef struct coro *Coro__State;	203	typedef struct coro *Coro__State;
100	typedef struct coro *Coro__State_or_hashref;	204	typedef struct coro *Coro__State_or_hashref;
101		205
102	static AV *main_mainstack; /* used to differentiate between $main and others */	206	/** Coro ********************************************************************/
103	static HV *coro_state_stash;
104	static SV *ucoro_state_sv;
105	static U32 ucoro_state_hash;
106	static HV *padlist_cache;
107	static SV *coro_mortal; /* will be freed after next transfer */
108		207
109	/* mostly copied from op.c:cv_clone2 */	208	#define PRIO_MAX 3
110	STATIC AV *	209	#define PRIO_HIGH 1
111	clone_padlist (AV *protopadlist)	210	#define PRIO_NORMAL 0
		211	#define PRIO_LOW -1
		212	#define PRIO_IDLE -3
		213	#define PRIO_MIN -4
		214
		215	/* for Coro.pm */
		216	static SV *coro_current;
		217	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		218	static int coro_nready;
		219	static struct coro *coro_first;
		220
		221	/** lowlevel stuff **********************************************************/
		222
		223	static AV *
		224	coro_clone_padlist (pTHX_ CV *cv)
112	{	225	{
113	AV *av;	226	AV *padlist = CvPADLIST (cv);
114	I32 ix;
115	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
116	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
117	SV **pname = AvARRAY (protopad_name);
118	SV **ppad = AvARRAY (protopad);
119	I32 fname = AvFILLp (protopad_name);
120	I32 fpad = AvFILLp (protopad);
121	AV *newpadlist, *newpad_name, *newpad;	227	AV *newpadlist, *newpad;
122	SV **npad;
123
124	newpad_name = newAV ();
125	for (ix = fname; ix >= 0; ix--)
126	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
127
128	newpad = newAV ();
129	av_fill (newpad, AvFILLp (protopad));
130	npad = AvARRAY (newpad);
131		228
132	newpadlist = newAV ();	229	newpadlist = newAV ();
133	AvREAL_off (newpadlist);	230	AvREAL_off (newpadlist);
134	av_store (newpadlist, 0, (SV *) newpad_name);	231	#if PERL_VERSION_ATLEAST (5,9,0)
		232	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		233	#else
		234	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		235	#endif
		236	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		237	--AvFILLp (padlist);
		238
		239	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
135	av_store (newpadlist, 1, (SV *) newpad);	240	av_store (newpadlist, 1, (SV *)newpad);
136		241
137	av = newAV (); /* will be @_ */	242	return newpadlist;
138	av_extend (av, 0);	243	}
139	av_store (newpad, 0, (SV *) av);
140	AvFLAGS (av) = AVf_REIFY;
141		244
142	for (ix = fpad; ix > 0; ix--)	245	static void
		246	free_padlist (pTHX_ AV *padlist)
		247	{
		248	/* may be during global destruction */
		249	if (SvREFCNT (padlist))
143	{	250	{
144	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	251	I32 i = AvFILLp (padlist);
145	if (namesv && namesv != &PL_sv_undef)	252	while (i >= 0)
146	{	253	{
147	char *name = SvPVX (namesv); /* XXX */	254	SV **svp = av_fetch (padlist, i--, FALSE);
148	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	255	if (svp)
149	{ /* lexical from outside? */
150	npad[ix] = SvREFCNT_inc (ppad[ix]);
151	}	256	{
152	else
153	{ /* our own lexical */
154	SV *sv;	257	SV *sv;
155	if (*name == '&')	258	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
156	sv = SvREFCNT_inc (ppad[ix]);	259	SvREFCNT_dec (sv);
157	else if (*name == '@')	260
158	sv = (SV *) newAV ();	261	SvREFCNT_dec (*svp);
159	else if (*name == '%')
160	sv = (SV *) newHV ();
161	else
162	sv = NEWSV (0, 0);
163	if (!SvPADBUSY (sv))
164	SvPADMY_on (sv);
165	npad[ix] = sv;
166	}	262	}
167	}	263	}
168	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	264
		265	SvREFCNT_dec ((SV*)padlist);
		266	}
		267	}
		268
		269	static int
		270	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		271	{
		272	AV *padlist;
		273	AV *av = (AV *)mg->mg_obj;
		274
		275	/* casting is fun. */
		276	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
		277	free_padlist (aTHX_ padlist);
		278
		279	SvREFCNT_dec (av);
		280
		281	return 0;
		282	}
		283
		284	#define PERL_MAGIC_coro PERL_MAGIC_ext
		285
		286	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
		287
		288	#define CORO_MAGIC(cv) \
		289	SvMAGIC (cv) \
		290	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		291	? SvMAGIC (cv) \
		292	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		293	: 0
		294
		295	/* the next two functions merely cache the padlists */
		296	static void
		297	get_padlist (pTHX_ CV *cv)
		298	{
		299	MAGIC *mg = CORO_MAGIC (cv);
		300	AV *av;
		301
		302	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		303	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		304	else
		305	{
		306	#if CORO_PREFER_PERL_FUNCTIONS
		307	/* this is probably cleaner, but also slower? */
		308	CV *cp = Perl_cv_clone (cv);
		309	CvPADLIST (cv) = CvPADLIST (cp);
		310	CvPADLIST (cp) = 0;
		311	SvREFCNT_dec (cp);
		312	#else
		313	CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
		314	#endif
		315	}
		316	}
		317
		318	static void
		319	put_padlist (pTHX_ CV *cv)
		320	{
		321	MAGIC *mg = CORO_MAGIC (cv);
		322	AV *av;
		323
		324	if (!mg)
		325	{
		326	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		327	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		328	mg->mg_virtual = &vtbl_coro;
		329	mg->mg_obj = (SV *)newAV ();
		330	}
		331
		332	av = (AV *)mg->mg_obj;
		333
		334	if (AvFILLp (av) >= AvMAX (av))
		335	av_extend (av, AvMAX (av) + 1);
		336
		337	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
		338	}
		339
		340	/** load & save, init *******************************************************/
		341
		342	#define SB do {
		343	#define SE } while (0)
		344
		345	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
		346
		347	static void
		348	load_perl (pTHX_ Coro__State c)
		349	{
		350	#define VAR(name,type) PL_ ## name = c->name;
		351	# include "state.h"
		352	#undef VAR
		353
		354	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
		355	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
		356	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		357	if (c->deffh) REPLACE_SV (PL_defoutgv , c->deffh);
		358
		359	if (c->irssv)
		360	{
		361	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
169	{	362	{
170	npad[ix] = SvREFCNT_inc (ppad[ix]);	363	SvREFCNT_dec (c->irssv);
		364	c->irssv = 0;
171	}	365	}
172	else	366	else
173	{	367	{
174	SV *sv = NEWSV (0, 0);	368	REPLACE_SV (PL_rs, c->irssv);
175	SvPADTMP_on (sv);	369	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
176	npad[ix] = sv;	370	sv_setsv (c->irssv_sv, PL_rs);
177	}	371	}
178	}	372	}
179
180	#if 0 /* return -ENOTUNDERSTOOD */
181	/* Now that vars are all in place, clone nested closures. */
182
183	for (ix = fpad; ix > 0; ix--) {
184	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
185	if (namesv
186	&& namesv != &PL_sv_undef
187	&& !(SvFLAGS(namesv) & SVf_FAKE)
188	&& *SvPVX(namesv) == '&'
189	&& CvCLONE(ppad[ix]))
190	{
191	CV *kid = cv_clone((CV*)ppad[ix]);
192	SvREFCNT_dec(ppad[ix]);
193	CvCLONE_on(kid);
194	SvPADMY_on(kid);
195	npad[ix] = (SV*)kid;
196	}
197	}
198	#endif
199
200	return newpadlist;
201	}
202
203	#ifdef MAY_FLUSH
204	STATIC void
205	free_padlist (AV *padlist)
206	{
207	/* may be during global destruction */
208	if (SvREFCNT(padlist))
209	{
210	I32 i = AvFILLp(padlist);
211	while (i >= 0)
212	{
213	SV **svp = av_fetch(padlist, i--, FALSE);
214	SV *sv = svp ? *svp : Nullsv;
215	if (sv)
216	SvREFCNT_dec(sv);
217	}
218
219	SvREFCNT_dec((SV*)padlist);
220	}
221	}
222	#endif
223
224	/* the next two functions merely cache the padlists */
225	STATIC void
226	get_padlist (CV *cv)
227	{
228	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
229
230	if (he && AvFILLp ((AV *)*he) >= 0)
231	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
232	else
233	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
234	}
235
236	STATIC void
237	put_padlist (CV *cv)
238	{
239	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
240
241	if (SvTYPE (*he) != SVt_PVAV)
242	{
243	SvREFCNT_dec (*he);
244	*he = (SV *)newAV ();
245	}
246
247	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
248	}
249
250	#ifdef MAY_FLUSH
251	STATIC void
252	flush_padlist_cache ()
253	{
254	HV *hv = padlist_cache;
255	padlist_cache = newHV ();
256
257	if (hv_iterinit (hv))
258	{
259	HE *he;
260	AV *padlist;
261
262	while (!!(he = hv_iternext (hv)))
263	{
264	AV *av = (AV *)HeVAL(he);
265
266	/* casting is fun. */
267	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
268	free_padlist (padlist);
269	}
270	}
271
272	SvREFCNT_dec (hv);
273	}
274	#endif
275
276	#define SB do {
277	#define SE } while (0)
278
279	#define LOAD(state) load_state(aTHX_ (state));
280	#define SAVE(state,flags) save_state(aTHX_ (state),(flags));
281
282	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE
283
284	static void
285	load_state(pTHX_ Coro__State c)
286	{
287	PL_dowarn = c->dowarn;
288	PL_in_eval = c->in_eval;
289
290	PL_curstackinfo = c->curstackinfo;
291	PL_curstack = c->curstack;
292	PL_mainstack = c->mainstack;
293	PL_stack_sp = c->stack_sp;
294	PL_op = c->op;
295	PL_curpad = c->curpad;
296	PL_comppad = c->comppad;
297	PL_stack_base = c->stack_base;
298	PL_stack_max = c->stack_max;
299	PL_tmps_stack = c->tmps_stack;
300	PL_tmps_floor = c->tmps_floor;
301	PL_tmps_ix = c->tmps_ix;
302	PL_tmps_max = c->tmps_max;
303	PL_markstack = c->markstack;
304	PL_markstack_ptr = c->markstack_ptr;
305	PL_markstack_max = c->markstack_max;
306	PL_scopestack = c->scopestack;
307	PL_scopestack_ix = c->scopestack_ix;
308	PL_scopestack_max = c->scopestack_max;
309	PL_savestack = c->savestack;
310	PL_savestack_ix = c->savestack_ix;
311	PL_savestack_max = c->savestack_max;
312	PL_retstack = c->retstack;
313	PL_retstack_ix = c->retstack_ix;
314	PL_retstack_max = c->retstack_max;
315	PL_curcop = c->curcop;
316	PL_top_env = c->top_env;
317
318	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
319	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
320	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
321		373
322	{	374	{
323	dSP;	375	dSP;
324	CV *cv;	376	CV *cv;
325		377
326	/* now do the ugly restore mess */	378	/* now do the ugly restore mess */
327	while ((cv = (CV *)POPs))	379	while ((cv = (CV *)POPs))
328	{	380	{
329	AV *padlist = (AV *)POPs;
330
331	if (padlist)
332	{
333	put_padlist (cv); /* mark this padlist as available */	381	put_padlist (aTHX_ cv); /* mark this padlist as available */
334	CvPADLIST(cv) = padlist;	382	CvDEPTH (cv) = PTR2IV (POPs);
335	#ifdef USE_THREADS	383	CvPADLIST (cv) = (AV *)POPs;
336	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
337	#endif
338	}
339
340	++CvDEPTH(cv);
341	}	384	}
342		385
343	PUTBACK;	386	PUTBACK;
344	}	387	}
345	}	388	}
346		389
347	static void	390	static void
348	save_state(pTHX_ Coro__State c, int flags)	391	save_perl (pTHX_ Coro__State c)
349	{	392	{
350	{	393	{
351	dSP;	394	dSP;
352	I32 cxix = cxstack_ix;	395	I32 cxix = cxstack_ix;
353	PERL_CONTEXT *ccstk = cxstack;	396	PERL_CONTEXT *ccstk = cxstack;
…		…
356	/*	399	/*
357	* the worst thing you can imagine happens first - we have to save	400	* the worst thing you can imagine happens first - we have to save
358	* (and reinitialize) all cv's in the whole callchain :(	401	* (and reinitialize) all cv's in the whole callchain :(
359	*/	402	*/
360		403
361	PUSHs (Nullsv);	404	XPUSHs (Nullsv);
362	/* this loop was inspired by pp_caller */	405	/* this loop was inspired by pp_caller */
363	for (;;)	406	for (;;)
364	{	407	{
365	while (cxix >= 0)	408	while (cxix >= 0)
366	{	409	{
367	PERL_CONTEXT *cx = &ccstk[cxix--];	410	PERL_CONTEXT *cx = &ccstk[cxix--];
368		411
369	if (CxTYPE(cx) == CXt_SUB)	412	if (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT)
370	{	413	{
371	CV *cv = cx->blk_sub.cv;	414	CV *cv = cx->blk_sub.cv;
		415
372	if (CvDEPTH(cv))	416	if (CvDEPTH (cv))
373	{	417	{
374	#ifdef USE_THREADS
375	/*XPUSHs ((SV *)CvOWNER(cv));*/
376	/*CvOWNER(cv) = 0;*/
377	/*error must unlock this cv etc.. etc...*/
378	#endif
379	EXTEND (SP, CvDEPTH(cv)*2);	418	EXTEND (SP, 3);
380
381	while (--CvDEPTH(cv))
382	{
383	/* this tells the restore code to increment CvDEPTH */
384	PUSHs (Nullsv);
385	PUSHs ((SV *)cv);
386	}
387
388	PUSHs ((SV *)CvPADLIST(cv));	419	PUSHs ((SV *)CvPADLIST (cv));
		420	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
389	PUSHs ((SV *)cv);	421	PUSHs ((SV *)cv);
390		422
391	get_padlist (cv); /* this is a monster */	423	CvDEPTH (cv) = 0;
		424	get_padlist (aTHX_ cv);
392	}	425	}
393	}	426	}
394	else if (CxTYPE(cx) == CXt_FORMAT)
395	{
396	/* I never used formats, so how should I know how these are implemented? */
397	/* my bold guess is as a simple, plain sub... */
398	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
399	}
400	}	427	}
401		428
402	if (top_si->si_type == PERLSI_MAIN)	429	if (top_si->si_type == PERLSI_MAIN)
403	break;	430	break;
404		431
405	top_si = top_si->si_prev;	432	top_si = top_si->si_prev;
406	ccstk = top_si->si_cxstack;	433	ccstk = top_si->si_cxstack;
407	cxix = top_si->si_cxix;	434	cxix = top_si->si_cxix;
408	}	435	}
409		436
410	PUTBACK;	437	PUTBACK;
411	}	438	}
412		439
413	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	440	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
414	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	441	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
415	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	442	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		443	c->deffh = c->save & CORO_SAVE_DEFFH ? (GV *)SvREFCNT_inc (PL_defoutgv) : 0;
		444	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
416		445
417	c->dowarn = PL_dowarn;	446	#define VAR(name,type)c->name = PL_ ## name;
418	c->in_eval = PL_in_eval;	447	# include "state.h"
419		448	#undef VAR
420	c->curstackinfo = PL_curstackinfo;
421	c->curstack = PL_curstack;
422	c->mainstack = PL_mainstack;
423	c->stack_sp = PL_stack_sp;
424	c->op = PL_op;
425	c->curpad = PL_curpad;
426	c->comppad = PL_comppad;
427	c->stack_base = PL_stack_base;
428	c->stack_max = PL_stack_max;
429	c->tmps_stack = PL_tmps_stack;
430	c->tmps_floor = PL_tmps_floor;
431	c->tmps_ix = PL_tmps_ix;
432	c->tmps_max = PL_tmps_max;
433	c->markstack = PL_markstack;
434	c->markstack_ptr = PL_markstack_ptr;
435	c->markstack_max = PL_markstack_max;
436	c->scopestack = PL_scopestack;
437	c->scopestack_ix = PL_scopestack_ix;
438	c->scopestack_max = PL_scopestack_max;
439	c->savestack = PL_savestack;
440	c->savestack_ix = PL_savestack_ix;
441	c->savestack_max = PL_savestack_max;
442	c->retstack = PL_retstack;
443	c->retstack_ix = PL_retstack_ix;
444	c->retstack_max = PL_retstack_max;
445	c->curcop = PL_curcop;
446	c->top_env = PL_top_env;
447	}	449	}
448		450
449	/*	451	/*
450	* allocate various perl stacks. This is an exact copy	452	* allocate various perl stacks. This is an exact copy
451	* of perl.c:init_stacks, except that it uses less memory	453	* of perl.c:init_stacks, except that it uses less memory
452	* on the assumption that coroutines do not usually need	454	* on the (sometimes correct) assumption that coroutines do
453	* a lot of stackspace.	455	* not usually need a lot of stackspace.
454	*/	456	*/
455	STATIC void	457	#if CORO_PREFER_PERL_FUNCTIONS
		458	# define coro_init_stacks init_stacks
		459	#else
		460	static void
456	coro_init_stacks (pTHX)	461	coro_init_stacks (pTHX)
457	{	462	{
458	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	463	PL_curstackinfo = new_stackinfo(64, 6);
459	PL_curstackinfo->si_type = PERLSI_MAIN;	464	PL_curstackinfo->si_type = PERLSI_MAIN;
460	PL_curstack = PL_curstackinfo->si_stack;	465	PL_curstack = PL_curstackinfo->si_stack;
461	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	466	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
462		467
463	PL_stack_base = AvARRAY(PL_curstack);	468	PL_stack_base = AvARRAY(PL_curstack);
464	PL_stack_sp = PL_stack_base;	469	PL_stack_sp = PL_stack_base;
465	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	470	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
466		471
467	New(50,PL_tmps_stack,96,SV*);	472	New(50,PL_tmps_stack,64,SV*);
468	PL_tmps_floor = -1;	473	PL_tmps_floor = -1;
469	PL_tmps_ix = -1;	474	PL_tmps_ix = -1;
470	PL_tmps_max = 96;	475	PL_tmps_max = 64;
471		476
472	New(54,PL_markstack,16,I32);	477	New(54,PL_markstack,16,I32);
473	PL_markstack_ptr = PL_markstack;	478	PL_markstack_ptr = PL_markstack;
474	PL_markstack_max = PL_markstack + 16;	479	PL_markstack_max = PL_markstack + 16;
475		480
		481	#ifdef SET_MARK_OFFSET
476	SET_MARK_OFFSET;	482	SET_MARK_OFFSET;
		483	#endif
477		484
478	New(54,PL_scopestack,16,I32);	485	New(54,PL_scopestack,16,I32);
479	PL_scopestack_ix = 0;	486	PL_scopestack_ix = 0;
480	PL_scopestack_max = 16;	487	PL_scopestack_max = 16;
481		488
482	New(54,PL_savestack,96,ANY);	489	New(54,PL_savestack,64,ANY);
483	PL_savestack_ix = 0;	490	PL_savestack_ix = 0;
484	PL_savestack_max = 96;	491	PL_savestack_max = 64;
485		492
		493	#if !PERL_VERSION_ATLEAST (5,9,0)
486	New(54,PL_retstack,8,OP*);	494	New(54,PL_retstack,4,OP*);
487	PL_retstack_ix = 0;	495	PL_retstack_ix = 0;
488	PL_retstack_max = 8;	496	PL_retstack_max = 4;
		497	#endif
489	}	498	}
		499	#endif
490		500
491	/*	501	/*
492	* destroy the stacks, the callchain etc...	502	* destroy the stacks, the callchain etc...
493	* still there is a memleak of 128 bytes...
494	*/	503	*/
495	STATIC void	504	static void
496	destroy_stacks(pTHX)	505	coro_destroy_stacks (pTHX)
497	{	506	{
498	if (!IN_DESTRUCT)	507	if (!IN_DESTRUCT)
499	{	508	{
500	/* is this ugly, I ask? */	509	/* restore all saved variables and stuff */
501	while (PL_scopestack_ix)	510	LEAVE_SCOPE (0);
502	LEAVE;	511	assert (PL_tmps_floor == -1);
503		512
504	/* sure it is, but more important: is it correct?? :/ */	513	/* free all temporaries */
505	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
506	FREETMPS;	514	FREETMPS;
		515	assert (PL_tmps_ix == -1);
		516
		517	/* unwind all extra stacks */
		518	POPSTACK_TO (PL_mainstack);
		519
		520	/* unwind main stack */
		521	dounwind (-1);
507	}	522	}
508		523
509	while (PL_curstackinfo->si_next)	524	while (PL_curstackinfo->si_next)
510	PL_curstackinfo = PL_curstackinfo->si_next;	525	PL_curstackinfo = PL_curstackinfo->si_next;
511		526
512	while (PL_curstackinfo)	527	while (PL_curstackinfo)
513	{	528	{
514	PERL_SI *p = PL_curstackinfo->si_prev;	529	PERL_SI *p = PL_curstackinfo->si_prev;
515		530
516	{
517	dSP;
518	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
519	PUTBACK; /* possibly superfluous */
520	}
521
522	if (!IN_DESTRUCT)	531	if (!IN_DESTRUCT)
523	{
524	dounwind(-1);
525	SvREFCNT_dec(PL_curstackinfo->si_stack);	532	SvREFCNT_dec (PL_curstackinfo->si_stack);
526	}
527		533
528	Safefree(PL_curstackinfo->si_cxstack);	534	Safefree (PL_curstackinfo->si_cxstack);
529	Safefree(PL_curstackinfo);	535	Safefree (PL_curstackinfo);
530	PL_curstackinfo = p;	536	PL_curstackinfo = p;
531	}	537	}
532		538
533	Safefree(PL_tmps_stack);	539	Safefree (PL_tmps_stack);
534	Safefree(PL_markstack);	540	Safefree (PL_markstack);
535	Safefree(PL_scopestack);	541	Safefree (PL_scopestack);
536	Safefree(PL_savestack);	542	Safefree (PL_savestack);
		543	#if !PERL_VERSION_ATLEAST (5,9,0)
537	Safefree(PL_retstack);	544	Safefree (PL_retstack);
538	}
539
540	static void
541	allocate_stack (Coro__State ctx, int alloc)
542	{
543	coro_stack *stack;
544
545	New (0, stack, 1, coro_stack);
546
547	stack->refcnt = 1;
548	stack->usecnt = 1;
549	stack->gencnt = ctx->gencnt = 0;
550	if (alloc)
551	{
552	#if HAVE_MMAP
553	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
554	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
555	if (stack->sptr == (void *)-1)
556	#endif	545	#endif
		546	}
		547
		548	static size_t
		549	coro_rss (struct coro *coro)
		550	{
		551	size_t rss = sizeof (coro);
		552
		553	if (coro->mainstack)
		554	{
		555	if (coro->flags & CF_RUNNING)
557	{	556	{
558	/*FIXME*//*D*//* reasonable stack size! */	557	#define VAR(name,type)coro->name = PL_ ## name;
559	stack->ssize = -4096 * sizeof (long);	558	# include "state.h"
560	New (0, stack->sptr, 4096, long);	559	#undef VAR
561	}	560	}
562	}
563	else
564	stack->sptr = 0;
565		561
566	ctx->stack = stack;	562	rss += sizeof (coro->curstackinfo);
567	}	563	rss += sizeof (struct xpvav) + (1 + AvFILL (coro->curstackinfo->si_stack)) * sizeof (SV *);
		564	rss += (coro->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
		565	rss += sizeof (struct xpvav) + (1 + AvFILL (coro->curstack)) * sizeof (SV *);
		566	rss += coro->tmps_max * sizeof (SV *);
		567	rss += (coro->markstack_max - coro->markstack_ptr) * sizeof (I32);
		568	rss += coro->scopestack_max * sizeof (I32);
		569	rss += coro->savestack_max * sizeof (ANY);
568		570
569	static void	571	#if !PERL_VERSION_ATLEAST (5,9,0)
570	deallocate_stack (Coro__State ctx)	572	rss += coro->retstack_max * sizeof (OP *);
571	{	573	#endif
572	coro_stack *stack = ctx->stack;
573
574	ctx->stack = 0;
575
576	if (stack)
577	{	574	}
578	if (!--stack->refcnt)
579	{
580	#ifdef HAVE_MMAP
581	if (stack->ssize > 0 && stack->sptr)
582	munmap (stack->sptr, stack->ssize);
583	else
584	#else
585	Safefree (stack->sptr);
586	#endif
587	Safefree (stack);
588	}
589	else if (ctx->gencnt == stack->gencnt)
590	--stack->usecnt;
591	}
592	}
593		575
		576	return rss;
		577	}
		578
		579	/** coroutine stack handling ************************************************/
		580
594	static void	581	static void
595	setup_coro (void *arg)	582	setup_coro (pTHX_ struct coro *coro)
596	{	583	{
597	/*	584	/*
598	* emulate part of the perl startup here.	585	* emulate part of the perl startup here.
599	*/	586	*/
		587	coro_init_stacks (aTHX);
		588
		589	PL_curcop = &PL_compiling;
		590	PL_in_eval = EVAL_NULL;
		591	PL_comppad = 0;
		592	PL_curpm = 0;
		593	PL_localizing = 0;
		594	PL_dirty = 0;
		595	PL_restartop = 0;
		596
		597	{
		598	dSP;
		599	LOGOP myop;
		600
		601	SvREFCNT_dec (GvAV (PL_defgv));
		602	GvAV (PL_defgv) = coro->args; coro->args = 0;
		603
		604	Zero (&myop, 1, LOGOP);
		605	myop.op_next = Nullop;
		606	myop.op_flags = OPf_WANT_VOID;
		607
		608	PUSHMARK (SP);
		609	XPUSHs (av_shift (GvAV (PL_defgv)));
		610	PUTBACK;
		611	PL_op = (OP *)&myop;
		612	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		613	SPAGAIN;
		614	}
		615
		616	ENTER; /* necessary e.g. for dounwind */
		617	}
		618
		619	static void
		620	free_coro_mortal (pTHX)
		621	{
		622	if (coro_mortal)
		623	{
		624	SvREFCNT_dec (coro_mortal);
		625	coro_mortal = 0;
		626	}
		627	}
		628
		629	/* inject a fake call to Coro::State::_cctx_init into the execution */
		630	/* _cctx_init should be careful, as it could be called at almost any time */
		631	/* during execution of a perl program */
		632	static void NOINLINE
		633	prepare_cctx (pTHX_ coro_cctx *cctx)
		634	{
600	dSP;	635	dSP;
601	Coro__State ctx = (Coro__State)arg;	636	LOGOP myop;
602	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
603		637
604	coro_init_stacks (aTHX);	638	Zero (&myop, 1, LOGOP);
605	/*PL_curcop = 0;*/	639	myop.op_next = PL_op;
606	/*PL_in_eval = PL_in_eval;*/ /* inherit */	640	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
607	SvREFCNT_dec (GvAV (PL_defgv));
608	GvAV (PL_defgv) = ctx->args;
609		641
		642	PUSHMARK (SP);
		643	EXTEND (SP, 2);
		644	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		645	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		646	PUTBACK;
		647	PL_op = (OP *)&myop;
		648	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
610	SPAGAIN;	649	SPAGAIN;
		650	}
611		651
612	if (ctx->stack)	652	/*
613	{	653	* this is a _very_ stripped down perl interpreter ;)
614	ctx->cursp = 0;	654	*/
		655	static void
		656	coro_run (void *arg)
		657	{
		658	dTHX;
615		659
616	PUSHMARK(SP);	660	/* coro_run is the alternative tail of transfer(), so unlock here. */
617	PUTBACK;	661	UNLOCK;
618	(void) call_sv (sub_init, G_VOID|G_NOARGS|G_EVAL);
619		662
620	if (SvTRUE (ERRSV))	663	PL_top_env = &PL_start_env;
621	croak (NULL);	664
622	else	665	/* inject a fake subroutine call to cctx_init */
623	croak ("FATAL: CCTXT coroutine returned!");	666	prepare_cctx (aTHX_ (coro_cctx *)arg);
		667
		668	/* somebody or something will hit me for both perl_run and PL_restartop */
		669	PL_restartop = PL_op;
		670	perl_run (PL_curinterp);
		671
		672	/*
		673	* If perl-run returns we assume exit() was being called or the coro
		674	* fell off the end, which seems to be the only valid (non-bug)
		675	* reason for perl_run to return. We try to exit by jumping to the
		676	* bootstrap-time "top" top_env, as we cannot restore the "main"
		677	* coroutine as Coro has no such concept
		678	*/
		679	PL_top_env = main_top_env;
		680	JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
		681	}
		682
		683	static coro_cctx *
		684	cctx_new ()
		685	{
		686	coro_cctx *cctx;
		687	void *stack_start;
		688	size_t stack_size;
		689
		690	++cctx_count;
		691
		692	Newz (0, cctx, 1, coro_cctx);
		693
		694	#if HAVE_MMAP
		695
		696	cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
		697	/* mmap supposedly does allocate-on-write for us */
		698	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		699
		700	if (cctx->sptr != (void *)-1)
		701	{
		702	# if CORO_STACKGUARD
		703	mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
		704	# endif
		705	stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
		706	stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
		707	cctx->mapped = 1;
624	}	708	}
625	else	709	else
626	{	710	#endif
627	UNOP myop;
628
629	PL_op = (OP *)&myop;
630
631	Zero(&myop, 1, UNOP);
632	myop.op_next = Nullop;
633	myop.op_flags = OPf_WANT_VOID;
634
635	PUSHMARK(SP);
636	XPUSHs (sub_init);
637	/*
638	* the next line is slightly wrong, as PL_op->op_next
639	* is actually being executed so we skip the first op.
640	* that doesn't matter, though, since it is only
641	* pp_nextstate and we never return...
642	* ah yes, and I don't care anyways ;)
643	*/
644	PUTBACK;
645	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
646	SPAGAIN;
647
648	ENTER; /* necessary e.g. for dounwind */
649	}	711	{
650	}	712	cctx->ssize = coro_stacksize * (long)sizeof (long);
		713	New (0, cctx->sptr, coro_stacksize, long);
651		714
652	static void	715	if (!cctx->sptr)
653	continue_coro (void *arg)	716	{
654	{	717	perror ("FATAL: unable to allocate stack for coroutine");
655	/*	718	_exit (EXIT_FAILURE);
656	* this is a _very_ stripped down perl interpreter ;)	719	}
657	*/
658	Coro__State ctx = (Coro__State)arg;
659	JMPENV coro_start_env;
660		720
661	/* same as JMPENV_BOOTSTRAP */	721	stack_start = cctx->sptr;
662	Zero(&coro_start_env, 1, JMPENV);	722	stack_size = cctx->ssize;
663	coro_start_env.je_ret = -1;	723	}
664	coro_start_env.je_mustcatch = TRUE;
665	PL_top_env = &coro_start_env;
666		724
667	ctx->cursp = 0;	725	REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);
		726	coro_create (&cctx->cctx, coro_run, (void *)cctx, stack_start, stack_size);
		727
		728	return cctx;
		729	}
		730
		731	static void
		732	cctx_destroy (coro_cctx *cctx)
		733	{
		734	if (!cctx)
		735	return;
		736
		737	--cctx_count;
		738
		739	#if CORO_USE_VALGRIND
		740	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		741	#endif
		742
		743	#if HAVE_MMAP
		744	if (cctx->mapped)
		745	munmap (cctx->sptr, cctx->ssize);
		746	else
		747	#endif
		748	Safefree (cctx->sptr);
		749
		750	Safefree (cctx);
		751	}
		752
		753	static coro_cctx *
		754	cctx_get (pTHX)
		755	{
		756	while (cctx_first)
		757	{
		758	coro_cctx *cctx = cctx_first;
		759	cctx_first = cctx->next;
		760	--cctx_idle;
		761
		762	if (cctx->ssize >= coro_stacksize)
		763	return cctx;
		764
		765	cctx_destroy (cctx);
		766	}
		767
668	PL_op = PL_op->op_next;	768	PL_op = PL_op->op_next;
669	CALLRUNOPS(aTHX);	769	return cctx_new ();
670
671	abort ();
672	}	770	}
673		771
674	STATIC void	772	static void
		773	cctx_put (coro_cctx *cctx)
		774	{
		775	/* free another cctx if overlimit */
		776	if (cctx_idle >= MAX_IDLE_CCTX)
		777	{
		778	coro_cctx *first = cctx_first;
		779	cctx_first = first->next;
		780	--cctx_idle;
		781
		782	assert (!first->inuse);
		783	cctx_destroy (first);
		784	}
		785
		786	++cctx_idle;
		787	cctx->next = cctx_first;
		788	cctx_first = cctx;
		789	}
		790
		791	/** coroutine switching *****************************************************/
		792
		793	/* never call directly, always through the coro_state_transfer global variable */
		794	static void NOINLINE
675	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	795	transfer (pTHX_ struct coro *prev, struct coro *next)
676	{	796	{
677	dSTACKLEVEL;	797	dSTACKLEVEL;
678	static struct coro *xnext;
679		798
		799	/* sometimes transfer is only called to set idle_sp */
		800	if (!next)
		801	{
		802	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		803	assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
		804	}
680	if (prev != next)	805	else if (prev != next)
681	{	806	{
682	xnext = next;	807	coro_cctx *prev__cctx;
683		808
684	if (next->mainstack)	809	if (prev->flags & CF_NEW)
685	{	810	{
686	SAVE (prev, flags);	811	/* create a new empty context */
687	LOAD (next);	812	Newz (0, prev->cctx, 1, coro_cctx);
688		813	prev->cctx->inuse = 1;
689	/* mark this state as in-use */	814	prev->flags &= ~CF_NEW;
690	next->mainstack = 0;	815	prev->flags |= CF_RUNNING;
691	next->tmps_ix = -2;
692
693	/* stacklevel changed? if yes, grab the stack for us! */
694	if (flags & TRANSFER_SAVE_CCTXT)
695	{
696	if (!prev->stack)
697	allocate_stack (prev, 0);
698	else if (prev->cursp != stacklevel
699	&& prev->stack->usecnt > 1)
700	{
701	prev->gencnt = ++prev->stack->gencnt;
702	prev->stack->usecnt = 1;
703	}
704
705	/* has our stack been invalidated? */
706	if (next->stack && next->stack->gencnt != next->gencnt)
707	{
708	deallocate_stack (next);
709	allocate_stack (next, 1);
710	coro_create (&(next->stack->cctx),
711	continue_coro, (void *)next,
712	next->stack->sptr, labs (next->stack->ssize));
713	}
714
715	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
716	/* don't add any code here */
717	}
718
719	}	816	}
720	else if (next->tmps_ix == -2)	817
721	croak ("tried to transfer to running coroutine");	818	/*TODO: must not croak here */
		819	if (!prev->flags & CF_RUNNING)
		820	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		821
		822	if (next->flags & CF_RUNNING)
		823	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		824
		825	if (next->flags & CF_DESTROYED)
		826	croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
		827
		828	prev->flags &= ~CF_RUNNING;
		829	next->flags |= CF_RUNNING;
		830
		831	LOCK;
		832
		833	if (next->flags & CF_NEW)
		834	{
		835	/* need to start coroutine */
		836	next->flags &= ~CF_NEW;
		837	/* first get rid of the old state */
		838	save_perl (aTHX_ prev);
		839	/* setup coroutine call */
		840	setup_coro (aTHX_ next);
		841	/* need a new stack */
		842	assert (!next->cctx);
		843	}
722	else	844	else
723	{	845	{
724	SAVE (prev, -1); /* first get rid of the old state */	846	/* coroutine already started */
725		847	save_perl (aTHX_ prev);
726	if (flags & TRANSFER_SAVE_CCTXT)	848	load_perl (aTHX_ next);
727	{
728	if (!prev->stack)
729	allocate_stack (prev, 0);
730
731	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
732	{
733	setup_coro (next);
734
735	prev->stack->refcnt++;
736	prev->stack->usecnt++;
737	next->stack = prev->stack;
738	next->gencnt = prev->gencnt;
739	}
740	else
741	{
742	allocate_stack (next, 1);
743	coro_create (&(next->stack->cctx),
744	setup_coro, (void *)next,
745	next->stack->sptr, labs (next->stack->ssize));
746	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
747	/* don't add any code here */
748	}
749	}
750	else
751	setup_coro (next);
752	}	849	}
753		850
754	/*	851	prev__cctx = prev->cctx;
755	* xnext is now either prev or next, depending on wether	852
756	* we switched the c stack or not. that's why I use a global	853	/* possibly "free" the cctx */
757	* variable, that should become thread-specific at one point.	854	if (prev__cctx->idle_sp == STACKLEVEL)
758	*/	855	{
759	xnext->cursp = stacklevel;	856	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
760	}	857	assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
761		858
762	if (coro_mortal)	859	prev->cctx = 0;
		860
		861	cctx_put (prev__cctx);
		862	prev__cctx->inuse = 0;
		863	}
		864
		865	if (!next->cctx)
		866	{
		867	next->cctx = cctx_get (aTHX);
		868	assert (!next->cctx->inuse);
		869	next->cctx->inuse = 1;
		870	}
		871
		872	if (prev__cctx != next->cctx)
		873	{
		874	prev__cctx->top_env = PL_top_env;
		875	PL_top_env = next->cctx->top_env;
		876	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		877	}
		878
		879	free_coro_mortal (aTHX);
		880	UNLOCK;
763	{	881	}
764	SvREFCNT_dec (coro_mortal);	882	}
765	coro_mortal = 0;	883
		884	struct transfer_args
		885	{
		886	struct coro *prev, *next;
		887	};
		888
		889	#define TRANSFER(ta) transfer (aTHX_ (ta).prev, (ta).next)
		890
		891	/** high level stuff ********************************************************/
		892
		893	static int
		894	coro_state_destroy (pTHX_ struct coro *coro)
		895	{
		896	if (coro->flags & CF_DESTROYED)
		897	return 0;
		898
		899	coro->flags |= CF_DESTROYED;
		900
		901	if (coro->flags & CF_READY)
766	}	902	{
767	}	903	/* reduce nready, as destroying a ready coro effectively unreadies it */
		904	/* alternative: look through all ready queues and remove the coro */
		905	LOCK;
		906	--coro_nready;
		907	UNLOCK;
		908	}
		909	else
		910	coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
768		911
769	#define SV_CORO(sv,func) \	912	if (coro->mainstack && coro->mainstack != main_mainstack)
770	do { \	913	{
771	if (SvROK (sv)) \	914	struct coro temp;
772	sv = SvRV (sv); \
773	\
774	if (SvTYPE(sv) == SVt_PVHV) \
775	{ \
776	HE *he = hv_fetch_ent((HV *)sv, ucoro_state_sv, 0, ucoro_state_hash); \
777	\
778	if (!he) \
779	croak ("%s() -- %s is a hashref but lacks the " UCORO_STATE " key", func, # sv); \
780	\
781	(sv) = SvRV (HeVAL(he)); \
782	} \
783	\
784	/* must also be changed inside Coro::Cont::yield */ \
785	if (!SvOBJECT(sv) || SvSTASH(sv) != coro_state_stash) \
786	croak ("%s() -- %s is not (and contains not) a Coro::State object", func, # sv); \
787	\
788	} while(0)
789		915
790	#define SvSTATE(sv) (struct coro *)SvIV (sv)	916	assert (!(coro->flags & CF_RUNNING));
791		917
		918	Zero (&temp, 1, struct coro);
		919	temp.save = CORO_SAVE_ALL;
		920
		921	if (coro->flags & CF_RUNNING)
		922	croak ("FATAL: tried to destroy currently running coroutine");
		923
		924	save_perl (aTHX_ &temp);
		925	load_perl (aTHX_ coro);
		926
		927	coro_destroy_stacks (aTHX);
		928
		929	load_perl (aTHX_ &temp); /* this will get rid of defsv etc.. */
		930
		931	coro->mainstack = 0;
		932	}
		933
		934	cctx_destroy (coro->cctx);
		935	SvREFCNT_dec (coro->args);
		936
		937	if (coro->next) coro->next->prev = coro->prev;
		938	if (coro->prev) coro->prev->next = coro->next;
		939	if (coro == coro_first) coro_first = coro->next;
		940
		941	return 1;
		942	}
		943
792	static void	944	static int
		945	coro_state_free (pTHX_ SV *sv, MAGIC *mg)
		946	{
		947	struct coro *coro = (struct coro *)mg->mg_ptr;
		948	mg->mg_ptr = 0;
		949
		950	coro->hv = 0;
		951
		952	if (--coro->refcnt < 0)
		953	{
		954	coro_state_destroy (aTHX_ coro);
		955	Safefree (coro);
		956	}
		957
		958	return 0;
		959	}
		960
		961	static int
		962	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		963	{
		964	struct coro *coro = (struct coro *)mg->mg_ptr;
		965
		966	++coro->refcnt;
		967
		968	return 0;
		969	}
		970
		971	static MGVTBL coro_state_vtbl = {
		972	0, 0, 0, 0,
		973	coro_state_free,
		974	0,
		975	#ifdef MGf_DUP
		976	coro_state_dup,
		977	#else
		978	# define MGf_DUP 0
		979	#endif
		980	};
		981
		982	static struct coro *
		983	SvSTATE_ (pTHX_ SV *coro)
		984	{
		985	HV *stash;
		986	MAGIC *mg;
		987
		988	if (SvROK (coro))
		989	coro = SvRV (coro);
		990
		991	stash = SvSTASH (coro);
		992	if (stash != coro_stash && stash != coro_state_stash)
		993	{
		994	/* very slow, but rare, check */
		995	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		996	croak ("Coro::State object required");
		997	}
		998
		999	mg = CORO_MAGIC (coro);
		1000	return (struct coro *)mg->mg_ptr;
		1001	}
		1002
		1003	#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
		1004
		1005	static void
		1006	prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		1007	{
		1008	ta->prev = SvSTATE (prev_sv);
		1009	ta->next = SvSTATE (next_sv);
		1010	}
		1011
		1012	static void
793	api_transfer(pTHX_ SV *prev, SV *next, int flags)	1013	api_transfer (SV *prev_sv, SV *next_sv)
794	{	1014	{
795	SV_CORO (prev, "Coro::transfer");	1015	dTHX;
796	SV_CORO (next, "Coro::transfer");	1016	struct transfer_args ta;
797		1017
798	transfer(aTHX_ SvSTATE(prev), SvSTATE(next), flags);	1018	prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
		1019	TRANSFER (ta);
		1020	}
		1021
		1022	static int
		1023	api_save (SV *coro_sv, int new_save)
		1024	{
		1025	dTHX;
		1026	struct coro *coro = SvSTATE (coro_sv);
		1027	int old_save = coro->save;
		1028
		1029	if (new_save >= 0)
		1030	coro->save = new_save;
		1031
		1032	return old_save;
799	}	1033	}
800		1034
801	/** Coro ********************************************************************/	1035	/** Coro ********************************************************************/
802		1036
803	#define PRIO_MAX 3
804	#define PRIO_HIGH 1
805	#define PRIO_NORMAL 0
806	#define PRIO_LOW -1
807	#define PRIO_IDLE -3
808	#define PRIO_MIN -4
809
810	/* for Coro.pm */
811	static GV *coro_current, *coro_idle;
812	static AV *coro_ready[PRIO_MAX-PRIO_MIN+1];
813	static int coro_nready;
814
815	static void	1037	static void
816	coro_enq (SV *sv)	1038	coro_enq (pTHX_ SV *coro_sv)
817	{	1039	{
818	if (SvTYPE (sv) == SVt_PVHV)
819	{
820	SV **xprio = hv_fetch ((HV *)sv, "prio", 4, 0);
821	int prio = xprio ? SvIV (*xprio) : PRIO_NORMAL;
822
823	prio = prio > PRIO_MAX ? PRIO_MAX
824	: prio < PRIO_MIN ? PRIO_MIN
825	: prio;
826
827	av_push (coro_ready [prio - PRIO_MIN], sv);	1040	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
828	coro_nready++;
829
830	return;
831	}
832
833	croak ("Coro::ready tried to enqueue something that is not a coroutine");
834	}	1041	}
835		1042
836	static SV *	1043	static SV *
837	coro_deq (int min_prio)	1044	coro_deq (pTHX_ int min_prio)
838	{	1045	{
839	int prio = PRIO_MAX - PRIO_MIN;	1046	int prio = PRIO_MAX - PRIO_MIN;
840		1047
841	min_prio -= PRIO_MIN;	1048	min_prio -= PRIO_MIN;
842	if (min_prio < 0)	1049	if (min_prio < 0)
843	min_prio = 0;	1050	min_prio = 0;
844		1051
845	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )	1052	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
846	if (av_len (coro_ready[prio]) >= 0)	1053	if (AvFILLp (coro_ready [prio]) >= 0)
847	{
848	coro_nready--;
849	return av_shift (coro_ready[prio]);	1054	return av_shift (coro_ready [prio]);
850	}
851		1055
852	return 0;	1056	return 0;
853	}	1057	}
854		1058
855	static void	1059	static int
856	api_ready (SV *coro)	1060	api_ready (SV *coro_sv)
857	{	1061	{
		1062	dTHX;
		1063	struct coro *coro;
		1064
858	if (SvROK (coro))	1065	if (SvROK (coro_sv))
859	coro = SvRV (coro);	1066	coro_sv = SvRV (coro_sv);
860		1067
		1068	coro = SvSTATE (coro_sv);
		1069
		1070	if (coro->flags & CF_READY)
		1071	return 0;
		1072
		1073	coro->flags |= CF_READY;
		1074
		1075	LOCK;
861	coro_enq (SvREFCNT_inc (coro));	1076	coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
		1077	++coro_nready;
		1078	UNLOCK;
		1079
		1080	return 1;
		1081	}
		1082
		1083	static int
		1084	api_is_ready (SV *coro_sv)
		1085	{
		1086	dTHX;
		1087	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		1088	}
		1089
		1090	static void
		1091	prepare_schedule (pTHX_ struct transfer_args *ta)
		1092	{
		1093	SV *prev_sv, *next_sv;
		1094
		1095	for (;;)
		1096	{
		1097	LOCK;
		1098	next_sv = coro_deq (aTHX_ PRIO_MIN);
		1099
		1100	/* nothing to schedule: call the idle handler */
		1101	if (!next_sv)
		1102	{
		1103	dSP;
		1104	UNLOCK;
		1105
		1106	ENTER;
		1107	SAVETMPS;
		1108
		1109	PUSHMARK (SP);
		1110	PUTBACK;
		1111	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1112
		1113	FREETMPS;
		1114	LEAVE;
		1115	continue;
		1116	}
		1117
		1118	ta->next = SvSTATE (next_sv);
		1119
		1120	/* cannot transfer to destroyed coros, skip and look for next */
		1121	if (ta->next->flags & CF_DESTROYED)
		1122	{
		1123	UNLOCK;
		1124	SvREFCNT_dec (next_sv);
		1125	/* coro_nready is already taken care of by destroy */
		1126	continue;
		1127	}
		1128
		1129	--coro_nready;
		1130	UNLOCK;
		1131	break;
		1132	}
		1133
		1134	/* free this only after the transfer */
		1135	prev_sv = SvRV (coro_current);
		1136	SvRV_set (coro_current, next_sv);
		1137	ta->prev = SvSTATE (prev_sv);
		1138
		1139	assert (ta->next->flags & CF_READY);
		1140	ta->next->flags &= ~CF_READY;
		1141
		1142	LOCK;
		1143	free_coro_mortal (aTHX);
		1144	coro_mortal = prev_sv;
		1145	UNLOCK;
		1146	}
		1147
		1148	static void
		1149	prepare_cede (pTHX_ struct transfer_args *ta)
		1150	{
		1151	api_ready (coro_current);
		1152	prepare_schedule (aTHX_ ta);
		1153	}
		1154
		1155	static int
		1156	prepare_cede_notself (pTHX_ struct transfer_args *ta)
		1157	{
		1158	if (coro_nready)
		1159	{
		1160	SV *prev = SvRV (coro_current);
		1161	prepare_schedule (aTHX_ ta);
		1162	api_ready (prev);
		1163	return 1;
		1164	}
		1165	else
		1166	return 0;
862	}	1167	}
863		1168
864	static void	1169	static void
865	api_schedule (void)	1170	api_schedule (void)
866	{	1171	{
867	SV *prev, *next;	1172	dTHX;
		1173	struct transfer_args ta;
868		1174
869	prev = SvRV (GvSV (coro_current));	1175	prepare_schedule (aTHX_ &ta);
870	next = coro_deq (PRIO_MIN);	1176	TRANSFER (ta);
871
872	if (!next)
873	next = SvREFCNT_inc (SvRV (GvSV (coro_idle)));
874
875	/* free this only after the transfer */
876	coro_mortal = prev;
877	SV_CORO (prev, "Coro::schedule");
878
879	SvRV (GvSV (coro_current)) = next;
880
881	SV_CORO (next, "Coro::schedule");
882
883	transfer (aTHX_ SvSTATE (prev), SvSTATE (next),
884	TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK);
885	}	1177	}
886		1178
887	static void	1179	static int
888	api_cede (void)	1180	api_cede (void)
889	{	1181	{
890	coro_enq (SvREFCNT_inc (SvRV (GvSV (coro_current))));	1182	dTHX;
		1183	struct transfer_args ta;
891		1184
892	api_schedule ();	1185	prepare_cede (aTHX_ &ta);
		1186
		1187	if (ta.prev != ta.next)
		1188	{
		1189	TRANSFER (ta);
		1190	return 1;
		1191	}
		1192	else
		1193	return 0;
		1194	}
		1195
		1196	static int
		1197	api_cede_notself (void)
		1198	{
		1199	dTHX;
		1200	struct transfer_args ta;
		1201
		1202	if (prepare_cede_notself (aTHX_ &ta))
		1203	{
		1204	TRANSFER (ta);
		1205	return 1;
		1206	}
		1207	else
		1208	return 0;
893	}	1209	}
894		1210
895	MODULE = Coro::State PACKAGE = Coro::State	1211	MODULE = Coro::State PACKAGE = Coro::State
896		1212
897	PROTOTYPES: ENABLE	1213	PROTOTYPES: DISABLE
898		1214
899	BOOT:	1215	BOOT:
900	{ /* {} necessary for stoopid perl-5.6.x */	1216	{
901	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1217	#ifdef USE_ITHREADS
902	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1218	MUTEX_INIT (&coro_mutex);
		1219	#endif
		1220	BOOT_PAGESIZE;
		1221
903	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1222	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
904		1223
905	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1224	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
906	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1225	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
907	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1226	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1227	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
		1228	newCONSTSUB (coro_state_stash, "SAVE_DEFFH", newSViv (CORO_SAVE_DEFFH));
908	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1229	newCONSTSUB (coro_state_stash, "SAVE_DEF", newSViv (CORO_SAVE_DEF));
909		1230	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
910	if (!padlist_cache)
911	padlist_cache = newHV ();
912		1231
913	main_mainstack = PL_mainstack;	1232	main_mainstack = PL_mainstack;
		1233	main_top_env = PL_top_env;
		1234
		1235	while (main_top_env->je_prev)
		1236	main_top_env = main_top_env->je_prev;
914		1237
915	coroapi.ver = CORO_API_VERSION;	1238	coroapi.ver = CORO_API_VERSION;
916	coroapi.transfer = api_transfer;	1239	coroapi.transfer = api_transfer;
917	}
918		1240
919	Coro::State	1241	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
920	_newprocess(args)	1242	}
921	SV * args	1243
922	PROTOTYPE: $	1244	SV *
		1245	new (char *klass, ...)
923	CODE:	1246	CODE:
924	Coro__State coro;	1247	{
		1248	struct coro *coro;
		1249	HV *hv;
		1250	int i;
925		1251
926	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
927	croak ("Coro::State::_newprocess expects an arrayref");
928
929	New (0, coro, 1, struct coro);	1252	Newz (0, coro, 1, struct coro);
		1253	coro->args = newAV ();
		1254	coro->save = CORO_SAVE_DEF;
		1255	coro->flags = CF_NEW;
930		1256
931	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1257	if (coro_first) coro_first->prev = coro;
932	coro->mainstack = 0; /* actual work is done inside transfer */	1258	coro->next = coro_first;
933	coro->stack = 0;	1259	coro_first = coro;
934		1260
935	RETVAL = coro;	1261	coro->hv = hv = newHV ();
		1262	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
		1263	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
		1264
		1265	for (i = 1; i < items; i++)
		1266	av_push (coro->args, newSVsv (ST (i)));
		1267	}
936	OUTPUT:	1268	OUTPUT:
937	RETVAL	1269	RETVAL
938		1270
		1271	int
		1272	save (SV *coro, int new_save = -1)
		1273	CODE:
		1274	RETVAL = api_save (coro, new_save);
		1275	OUTPUT:
		1276	RETVAL
		1277
		1278	int
		1279	save_also (SV *coro_sv, int save_also)
		1280	CODE:
		1281	{
		1282	struct coro *coro = SvSTATE (coro_sv);
		1283	RETVAL = coro->save;
		1284	coro->save |= save_also;
		1285	}
		1286	OUTPUT:
		1287	RETVAL
		1288
939	void	1289	void
940	transfer(prev, next, flags)	1290	_set_stacklevel (...)
941	SV *prev	1291	ALIAS:
942	SV *next	1292	Coro::State::transfer = 1
943	int flags	1293	Coro::schedule = 2
944	PROTOTYPE: @	1294	Coro::cede = 3
		1295	Coro::cede_notself = 4
945	CODE:	1296	CODE:
946	PUTBACK;	1297	{
947	SV_CORO (next, "Coro::transfer");	1298	struct transfer_args ta;
948	SV_CORO (prev, "Coro::transfer");	1299
949	transfer (aTHX_ SvSTATE (prev), SvSTATE (next), flags);	1300	switch (ix)
950	SPAGAIN;	1301	{
		1302	case 0:
		1303	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1304	ta.next = 0;
		1305	break;
		1306
		1307	case 1:
		1308	if (items != 2)
		1309	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1310
		1311	prepare_transfer (aTHX_ &ta, ST (0), ST (1));
		1312	break;
		1313
		1314	case 2:
		1315	prepare_schedule (aTHX_ &ta);
		1316	break;
		1317
		1318	case 3:
		1319	prepare_cede (aTHX_ &ta);
		1320	break;
		1321
		1322	case 4:
		1323	if (!prepare_cede_notself (aTHX_ &ta))
		1324	XSRETURN_EMPTY;
		1325
		1326	break;
		1327	}
		1328
		1329	BARRIER;
		1330	TRANSFER (ta);
		1331
		1332	if (GIMME_V != G_VOID && ta.next != ta.prev)
		1333	XSRETURN_YES;
		1334	}
		1335
		1336	bool
		1337	_destroy (SV *coro_sv)
		1338	CODE:
		1339	RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
		1340	OUTPUT:
		1341	RETVAL
951		1342
952	void	1343	void
953	DESTROY(coro)
954	Coro::State coro
955	CODE:
956
957	if (coro->mainstack && coro->mainstack != main_mainstack)
958	{
959	struct coro temp;
960
961	PUTBACK;
962	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);
963	LOAD(aTHX_ coro);
964	SPAGAIN;
965
966	destroy_stacks (aTHX);
967
968	LOAD((&temp)); /* this will get rid of defsv etc.. */
969	SPAGAIN;
970
971	coro->mainstack = 0;
972	}
973
974	deallocate_stack (coro);
975
976	Safefree (coro);
977
978	void
979	flush()
980	CODE:
981	#ifdef MAY_FLUSH
982	flush_padlist_cache ();
983	#endif
984
985	void
986	_exit(code)	1344	_exit (code)
987	int code	1345	int code
988	PROTOTYPE: $	1346	PROTOTYPE: $
989	CODE:	1347	CODE:
990	#if defined(__GLIBC__) || _POSIX_C_SOURCE
991	_exit (code);	1348	_exit (code);
992	#else
993	signal (SIGTERM, SIG_DFL);
994	raise (SIGTERM);
995	exit (code);
996	#endif
997		1349
998	MODULE = Coro::State PACKAGE = Coro::Cont	1350	int
		1351	cctx_stacksize (int new_stacksize = 0)
		1352	CODE:
		1353	RETVAL = coro_stacksize;
		1354	if (new_stacksize)
		1355	coro_stacksize = new_stacksize;
		1356	OUTPUT:
		1357	RETVAL
999		1358
1000	# this is slightly dirty (should expose a c-level api)	1359	int
		1360	cctx_count ()
		1361	CODE:
		1362	RETVAL = cctx_count;
		1363	OUTPUT:
		1364	RETVAL
		1365
		1366	int
		1367	cctx_idle ()
		1368	CODE:
		1369	RETVAL = cctx_idle;
		1370	OUTPUT:
		1371	RETVAL
1001		1372
1002	void	1373	void
1003	yield(...)	1374	list ()
1004	PROTOTYPE: @	1375	PPCODE:
		1376	{
		1377	struct coro *coro;
		1378	for (coro = coro_first; coro; coro = coro->next)
		1379	if (coro->hv)
		1380	XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
		1381	}
		1382
		1383	void
		1384	_eval (Coro::State coro, SV *coderef)
		1385	CODE:
		1386	{
		1387	if (coro->mainstack)
		1388	{
		1389	struct coro temp;
		1390	Zero (&temp, 1, struct coro);
		1391	temp.save = CORO_SAVE_ALL;
		1392
		1393	if (!(coro->flags & CF_RUNNING))
		1394	{
		1395	save_perl (aTHX_ &temp);
		1396	load_perl (aTHX_ coro);
		1397	}
		1398
		1399	{
		1400	dSP;
		1401	ENTER;
		1402	SAVETMPS;
		1403	PUSHMARK (SP);
		1404	PUTBACK;
		1405	call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
		1406	SPAGAIN;
		1407	FREETMPS;
		1408	LEAVE;
		1409	PUTBACK;
		1410	}
		1411
		1412	if (!(coro->flags & CF_RUNNING))
		1413	{
		1414	save_perl (aTHX_ coro);
		1415	load_perl (aTHX_ &temp);
		1416	}
		1417	}
		1418	}
		1419
		1420	SV *
		1421	is_ready (Coro::State coro)
		1422	PROTOTYPE: $
		1423	ALIAS:
		1424	is_ready = CF_READY
		1425	is_running = CF_RUNNING
		1426	is_new = CF_NEW
		1427	is_destroyed = CF_DESTROYED
		1428	CODE:
		1429	RETVAL = boolSV (coro->flags & ix);
		1430	OUTPUT:
		1431	RETVAL
		1432
		1433	SV *
		1434	has_stack (Coro::State coro)
		1435	PROTOTYPE: $
		1436	CODE:
		1437	RETVAL = boolSV (!!coro->cctx);
		1438	OUTPUT:
		1439	RETVAL
		1440
		1441	IV
		1442	rss (Coro::State coro)
		1443	PROTOTYPE: $
1005	CODE:	1444	CODE:
1006	static SV *returnstk;	1445	RETVAL = coro_rss (coro);
1007	SV *sv;	1446	OUTPUT:
1008	AV *defav = GvAV (PL_defgv);	1447	RETVAL
1009	struct coro *prev, *next;
1010		1448
1011	if (!returnstk)
1012	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
1013
1014	/* set up @_ -- ugly */
1015	av_clear (defav);
1016	av_fill (defav, items - 1);
1017	while (items--)
1018	av_store (defav, items, SvREFCNT_inc (ST(items)));
1019
1020	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
1021	sv = av_pop ((AV *)SvRV (returnstk));
1022	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
1023	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
1024	SvREFCNT_dec (sv);
1025
1026	transfer(aTHX_ prev, next, 0);
1027		1449
1028	MODULE = Coro::State PACKAGE = Coro	1450	MODULE = Coro::State PACKAGE = Coro
1029		1451
1030	# this is slightly dirty (should expose a c-level api)
1031
1032	BOOT:	1452	BOOT:
1033	{	1453	{
1034	int i;	1454	int i;
		1455
		1456	sv_pool_rss = get_sv ("Coro::POOL_RSS" , TRUE);
		1457	sv_pool_size = get_sv ("Coro::POOL_SIZE" , TRUE);
		1458	av_async_pool = get_av ("Coro::async_pool", TRUE);
		1459
		1460	coro_current = get_sv ("Coro::current", FALSE);
		1461	SvREADONLY_on (coro_current);
		1462
1035	HV *stash = gv_stashpv ("Coro", TRUE);	1463	coro_stash = gv_stashpv ("Coro", TRUE);
1036		1464
1037	newCONSTSUB (stash, "PRIO_MAX", newSViv (PRIO_MAX));	1465	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
1038	newCONSTSUB (stash, "PRIO_HIGH", newSViv (PRIO_HIGH));	1466	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
1039	newCONSTSUB (stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));	1467	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
1040	newCONSTSUB (stash, "PRIO_LOW", newSViv (PRIO_LOW));	1468	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
1041	newCONSTSUB (stash, "PRIO_IDLE", newSViv (PRIO_IDLE));	1469	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1042	newCONSTSUB (stash, "PRIO_MIN", newSViv (PRIO_MIN));	1470	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
1043
1044	coro_current = gv_fetchpv ("Coro::current", TRUE, SVt_PV);
1045	coro_idle = gv_fetchpv ("Coro::idle" , TRUE, SVt_PV);
1046		1471
1047	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )	1472	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1048	coro_ready[i] = newAV ();	1473	coro_ready[i] = newAV ();
1049		1474
1050	{	1475	{
1051	SV *sv = perl_get_sv("Coro::API", 1);	1476	SV *sv = perl_get_sv("Coro::API", 1);
1052		1477
1053	coroapi.schedule = api_schedule;	1478	coroapi.schedule = api_schedule;
		1479	coroapi.save = api_save;
1054	coroapi.cede = api_cede;	1480	coroapi.cede = api_cede;
		1481	coroapi.cede_notself = api_cede_notself;
1055	coroapi.ready = api_ready;	1482	coroapi.ready = api_ready;
		1483	coroapi.is_ready = api_is_ready;
1056	coroapi.nready = &coro_nready;	1484	coroapi.nready = &coro_nready;
1057	coroapi.current = coro_current;	1485	coroapi.current = coro_current;
1058		1486
1059	GCoroAPI = &coroapi;	1487	GCoroAPI = &coroapi;
1060	sv_setiv(sv, (IV)&coroapi);	1488	sv_setiv (sv, (IV)&coroapi);
1061	SvREADONLY_on(sv);	1489	SvREADONLY_on (sv);
1062	}	1490	}
1063	}	1491	}
1064		1492
1065	void	1493	void
1066	ready(self)	1494	_set_current (SV *current)
1067	SV * self
1068	PROTOTYPE: $	1495	PROTOTYPE: $
1069	CODE:	1496	CODE:
1070	api_ready (self);	1497	SvREFCNT_dec (SvRV (coro_current));
		1498	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1071		1499
1072	int	1500	int
		1501	prio (Coro::State coro, int newprio = 0)
		1502	ALIAS:
		1503	nice = 1
		1504	CODE:
		1505	{
		1506	RETVAL = coro->prio;
		1507
		1508	if (items > 1)
		1509	{
		1510	if (ix)
		1511	newprio = coro->prio - newprio;
		1512
		1513	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1514	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1515
		1516	coro->prio = newprio;
		1517	}
		1518	}
		1519	OUTPUT:
		1520	RETVAL
		1521
		1522	SV *
		1523	ready (SV *self)
		1524	PROTOTYPE: $
		1525	CODE:
		1526	RETVAL = boolSV (api_ready (self));
		1527	OUTPUT:
		1528	RETVAL
		1529
		1530	int
1073	nready(...)	1531	nready (...)
1074	PROTOTYPE:	1532	PROTOTYPE:
1075	CODE:	1533	CODE:
1076	RETVAL = coro_nready;	1534	RETVAL = coro_nready;
1077	OUTPUT:	1535	OUTPUT:
1078	RETVAL	1536	RETVAL
1079		1537
		1538	# for async_pool speedup
1080	void	1539	void
1081	schedule(...)	1540	_pool_1 (SV *cb)
1082	PROTOTYPE:
1083	CODE:	1541	CODE:
1084	api_schedule ();	1542	{
		1543	int i, len;
		1544	HV *hv = (HV *)SvRV (coro_current);
		1545	AV *defav = GvAV (PL_defgv);
		1546	SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
		1547	AV *invoke_av;
		1548
		1549	if (!invoke)
		1550	croak ("\3terminate\2\n");
		1551
		1552	hv_store (hv, "desc", sizeof ("desc") - 1,
		1553	newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
		1554
		1555	invoke_av = (AV *)SvRV (invoke);
		1556	len = av_len (invoke_av);
		1557
		1558	sv_setsv (cb, AvARRAY (invoke_av)[0]);
		1559
		1560	if (len > 0)
		1561	{
		1562	av_fill (defav, len - 1);
		1563	for (i = 0; i < len; ++i)
		1564	av_store (defav, i, SvREFCNT_inc (AvARRAY (invoke_av)[i + 1]));
		1565	}
		1566
		1567	SvREFCNT_dec (invoke);
		1568	}
1085		1569
1086	void	1570	void
1087	cede(...)	1571	_pool_2 (SV *cb)
1088	PROTOTYPE:
1089	CODE:	1572	CODE:
1090	api_cede ();	1573	{
		1574	struct coro *coro = SvSTATE (coro_current);
1091		1575
		1576	sv_setsv (cb, &PL_sv_undef);
		1577
		1578	if (coro_rss (coro) > SvIV (sv_pool_rss)
		1579	|| av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
		1580	croak ("\3terminate\2\n");
		1581
		1582	av_clear (GvAV (PL_defgv));
		1583	hv_store (SvRV (coro_current), "desc", sizeof ("desc") - 1,
		1584	newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
		1585	coro->save = CORO_SAVE_DEF;
		1586	coro->prio = 0;
		1587	av_push (av_async_pool, newSVsv (coro_current));
		1588	}
		1589
		1590
		1591	MODULE = Coro::State PACKAGE = Coro::AIO
		1592
		1593	SV *
		1594	_get_state ()
		1595	CODE:
		1596	{
		1597	struct io_state *data;
		1598
		1599	RETVAL = newSV (sizeof (struct io_state));
		1600	data = (struct io_state *)SvPVX (RETVAL);
		1601	SvCUR_set (RETVAL, sizeof (struct io_state));
		1602	SvPOK_only (RETVAL);
		1603
		1604	data->errorno = errno;
		1605	data->laststype = PL_laststype;
		1606	data->laststatval = PL_laststatval;
		1607	data->statcache = PL_statcache;
		1608	}
		1609	OUTPUT:
		1610	RETVAL
		1611
		1612	void
		1613	_set_state (char *data_)
		1614	PROTOTYPE: $
		1615	CODE:
		1616	{
		1617	struct io_state *data = (void *)data_;
		1618
		1619	errno = data->errorno;
		1620	PL_laststype = data->laststype;
		1621	PL_laststatval = data->laststatval;
		1622	PL_statcache = data->statcache;
		1623	}
		1624

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