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Comparing Coro/Coro/State.xs (file contents):
Revision 1.18 by root, Thu Jul 26 03:46:15 2001 UTC vs.
Revision 1.131 by root, Fri Dec 29 11:37:49 2006 UTC

		1	#include "libcoro/coro.c"
		2
1	#include "EXTERN.h"	3	#include "EXTERN.h"
2	#include "perl.h"	4	#include "perl.h"
3	#include "XSUB.h"	5	#include "XSUB.h"
4		6
5	#include "libcoro/coro.c"	7	#include "patchlevel.h"
		8
		9	#include <stdio.h>
		10	#include <errno.h>
		11	#include <assert.h>
6		12
7	#ifdef HAVE_MMAP	13	#ifdef HAVE_MMAP
8	# include <unistd.h>	14	# include <unistd.h>
9	# include <sys/mman.h>	15	# include <sys/mman.h>
10	# ifndef MAP_ANON
11	# ifdef MAP_ANONYMOUS	16	# ifndef MAP_ANONYMOUS
12	# define MAP_ANON MAP_ANONYMOUS	17	# ifdef MAP_ANON
		18	# define MAP_ANONYMOUS MAP_ANON
13	# else	19	# else
14	# undef HAVE_MMAP	20	# undef HAVE_MMAP
15	# endif	21	# endif
16	# endif	22	# endif
		23	# include <limits.h>
		24	# ifndef PAGESIZE
		25	# define PAGESIZE pagesize
		26	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		27	static long pagesize;
		28	# else
		29	# define BOOT_PAGESIZE (void)0
17	#endif	30	# endif
18
19	#define MAY_FLUSH /* increases codesize */
20
21	/* perl-related */
22	#define TRANSFER_SAVE_DEFAV 0x00000001
23	#define TRANSFER_SAVE_DEFSV 0x00000002
24	#define TRANSFER_SAVE_ERRSV 0x00000004
25	/* c-related */
26	#define TRANSFER_SAVE_CCTXT 0x00000008
27	#ifdef CORO_LAZY_STACK
28	# define TRANSFER_LAZY_STACK 0x00000010
29	#else	31	#else
30	# define TRANSFER_LAZY_STACK 0x00000000	32	# define PAGESIZE 0
		33	# define BOOT_PAGESIZE (void)0
		34	#endif
		35
		36	#if USE_VALGRIND
		37	# include <valgrind/valgrind.h>
		38	#endif
		39
		40	/* the maximum number of idle cctx that will be pooled */
		41	#define MAX_IDLE_CCTX 8
		42
		43	#define PERL_VERSION_ATLEAST(a,b,c) \
		44	(PERL_REVISION > (a) \
		45	|| (PERL_REVISION == (a) \
		46	&& (PERL_VERSION > (b) \
		47	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		48
		49	#if !PERL_VERSION_ATLEAST (5,6,0)
		50	# ifndef PL_ppaddr
		51	# define PL_ppaddr ppaddr
31	#endif	52	# endif
		53	# ifndef call_sv
		54	# define call_sv perl_call_sv
		55	# endif
		56	# ifndef get_sv
		57	# define get_sv perl_get_sv
		58	# endif
		59	# ifndef get_cv
		60	# define get_cv perl_get_cv
		61	# endif
		62	# ifndef IS_PADGV
		63	# define IS_PADGV(v) 0
		64	# endif
		65	# ifndef IS_PADCONST
		66	# define IS_PADCONST(v) 0
		67	# endif
		68	#endif
32		69
33	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \	70	/* 5.8.7 */
34	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)	71	#ifndef SvRV_set
		72	# define SvRV_set(s,v) SvRV(s) = (v)
		73	#endif
35		74
36	#define SUB_INIT "Coro::State::initialize"	75	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
37	#define UCORO_STATE "_coro_state"	76	# undef STACKGUARD
		77	#endif
38		78
		79	#ifndef STACKGUARD
		80	# define STACKGUARD 0
		81	#endif
		82
		83	/* prefer perl internal functions over our own? */
		84	#ifndef PREFER_PERL_FUNCTIONS
		85	# define PREFER_PERL_FUNCTIONS 0
		86	#endif
		87
39	/* The next macro should delcare a variable stacklevel that contains and approximation	88	/* The next macro should declare a variable stacklevel that contains and approximation
40	* to the current C stack pointer. It's property is that it changes with each call	89	* to the current C stack pointer. Its property is that it changes with each call
41	* and should be unique. */	90	* and should be unique. */
		91	#define dSTACKLEVEL int stacklevel
42	#define dSTACKLEVEL void *stacklevel = &stacklevel	92	#define STACKLEVEL ((void *)&stacklevel)
43		93
44	#define labs(l) ((l) >= 0 ? (l) : -(l))	94	#define IN_DESTRUCT (PL_main_cv == Nullcv)
45		95
46	/* this is actually not only the c stack but also c registers etc... */	96	#if __GNUC__ >= 3
		97	# define attribute(x) __attribute__(x)
		98	# define BARRIER __asm__ __volatile__ ("" : : : "memory")
		99	#else
		100	# define attribute(x)
		101	# define BARRIER
		102	#endif
		103
		104	#define NOINLINE attribute ((noinline))
		105
		106	#include "CoroAPI.h"
		107
		108	#ifdef USE_ITHREADS
		109	static perl_mutex coro_mutex;
		110	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		111	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		112	#else
		113	# define LOCK (void)0
		114	# define UNLOCK (void)0
		115	#endif
		116
		117	struct io_state
		118	{
		119	int errorno;
		120	I32 laststype;
		121	int laststatval;
		122	Stat_t statcache;
		123	};
		124
		125	static struct CoroAPI coroapi;
		126	static AV *main_mainstack; /* used to differentiate between $main and others */
		127	static HV *coro_state_stash, *coro_stash;
		128	static SV *coro_mortal; /* will be freed after next transfer */
		129
		130	static struct coro_cctx *cctx_first;
		131	static int cctx_count, cctx_idle;
		132
		133	/* this is a structure representing a c-level coroutine */
47	typedef struct {	134	typedef struct coro_cctx {
48	int refcnt; /* pointer reference counter */	135	struct coro_cctx *next;
49	int usecnt; /* shared by how many coroutines */
50	int gencnt; /* generation counter */
51		136
52	coro_context cctx;	137	/* the stack */
53
54	void *sptr;	138	void *sptr;
55	long ssize; /* positive == mmap, otherwise malloc */	139	long ssize; /* positive == mmap, otherwise malloc */
56	} coro_stack;
57		140
		141	/* cpu state */
		142	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		143	JMPENV *top_env;
		144	coro_context cctx;
		145
		146	int inuse;
		147
		148	#if USE_VALGRIND
		149	int valgrind_id;
		150	#endif
		151	} coro_cctx;
		152
		153	enum {
		154	CF_RUNNING = 0x0001, /* coroutine is running */
		155	CF_READY = 0x0002, /* coroutine is ready */
		156	CF_NEW = 0x0004, /* ahs never been switched to */
		157	};
		158
		159	/* this is a structure representing a perl-level coroutine */
58	struct coro {	160	struct coro {
59	/* the optional C context */	161	/* the c coroutine allocated to this perl coroutine, if any */
60	coro_stack *stack;	162	coro_cctx *cctx;
61	void *cursp;
62	int gencnt;
63
64	/* optionally saved, might be zero */
65	AV *defav;
66	SV *defsv;
67	SV *errsv;
68
69	/* saved global state not related to stacks */
70	U8 dowarn;
71
72	/* the stacks and related info (callchain etc..) */
73	PERL_SI *curstackinfo;
74	AV *curstack;
75	AV *mainstack;
76	SV **stack_sp;
77	OP *op;
78	SV **curpad;
79	SV **stack_base;
80	SV **stack_max;
81	SV **tmps_stack;
82	I32 tmps_floor;
83	I32 tmps_ix;
84	I32 tmps_max;
85	I32 *markstack;
86	I32 *markstack_ptr;
87	I32 *markstack_max;
88	I32 *scopestack;
89	I32 scopestack_ix;
90	I32 scopestack_max;
91	ANY *savestack;
92	I32 savestack_ix;
93	I32 savestack_max;
94	OP **retstack;
95	I32 retstack_ix;
96	I32 retstack_max;
97	COP *curcop;
98	JMPENV start_env;
99	JMPENV *top_env;
100		163
101	/* data associated with this coroutine (initial args) */	164	/* data associated with this coroutine (initial args) */
102	AV *args;	165	AV *args;
		166	int refcnt;
		167	int save; /* CORO_SAVE flags */
		168	int flags; /* CF_ flags */
		169
		170	/* optionally saved, might be zero */
		171	AV *defav; /* @_ */
		172	SV *defsv; /* $_ */
		173	SV *errsv; /* $@ */
		174	SV *irssv; /* $/ */
		175	SV *irssv_sv; /* real $/ cache */
		176
		177	#define VAR(name,type) type name;
		178	# include "state.h"
		179	#undef VAR
		180
		181	/* coro process data */
		182	int prio;
103	};	183	};
104		184
105	typedef struct coro *Coro__State;	185	typedef struct coro *Coro__State;
106	typedef struct coro *Coro__State_or_hashref;	186	typedef struct coro *Coro__State_or_hashref;
107		187
108	static AV *main_mainstack; /* used to differentiate between $main and others */	188	static AV *
109	static HV *coro_state_stash;	189	coro_clone_padlist (CV *cv)
110	static SV *ucoro_state_sv;
111	static U32 ucoro_state_hash;
112	static HV *padlist_cache;
113
114	/* mostly copied from op.c:cv_clone2 */
115	STATIC AV *
116	clone_padlist (AV *protopadlist)
117	{	190	{
118	AV *av;	191	AV *padlist = CvPADLIST (cv);
119	I32 ix;
120	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
121	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
122	SV **pname = AvARRAY (protopad_name);
123	SV **ppad = AvARRAY (protopad);
124	I32 fname = AvFILLp (protopad_name);
125	I32 fpad = AvFILLp (protopad);
126	AV *newpadlist, *newpad_name, *newpad;	192	AV *newpadlist, *newpad;
127	SV **npad;
128
129	newpad_name = newAV ();
130	for (ix = fname; ix >= 0; ix--)
131	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
132
133	newpad = newAV ();
134	av_fill (newpad, AvFILLp (protopad));
135	npad = AvARRAY (newpad);
136		193
137	newpadlist = newAV ();	194	newpadlist = newAV ();
138	AvREAL_off (newpadlist);	195	AvREAL_off (newpadlist);
139	av_store (newpadlist, 0, (SV *) newpad_name);	196	#if PERL_VERSION_ATLEAST (5,9,0)
		197	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		198	#else
		199	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		200	#endif
		201	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		202	--AvFILLp (padlist);
		203
		204	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
140	av_store (newpadlist, 1, (SV *) newpad);	205	av_store (newpadlist, 1, (SV *)newpad);
141		206
142	av = newAV (); /* will be @_ */	207	return newpadlist;
143	av_extend (av, 0);	208	}
144	av_store (newpad, 0, (SV *) av);
145	AvFLAGS (av) = AVf_REIFY;
146		209
147	for (ix = fpad; ix > 0; ix--)	210	static void
		211	free_padlist (AV *padlist)
		212	{
		213	/* may be during global destruction */
		214	if (SvREFCNT (padlist))
148	{	215	{
149	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	216	I32 i = AvFILLp (padlist);
150	if (namesv && namesv != &PL_sv_undef)	217	while (i >= 0)
151	{	218	{
152	char *name = SvPVX (namesv); /* XXX */	219	SV **svp = av_fetch (padlist, i--, FALSE);
153	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	220	if (svp)
154	{ /* lexical from outside? */
155	npad[ix] = SvREFCNT_inc (ppad[ix]);
156	}	221	{
157	else
158	{ /* our own lexical */
159	SV *sv;	222	SV *sv;
160	if (*name == '&')	223	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
161	sv = SvREFCNT_inc (ppad[ix]);	224	SvREFCNT_dec (sv);
162	else if (*name == '@')	225
163	sv = (SV *) newAV ();	226	SvREFCNT_dec (*svp);
164	else if (*name == '%')
165	sv = (SV *) newHV ();
166	else
167	sv = NEWSV (0, 0);
168	if (!SvPADBUSY (sv))
169	SvPADMY_on (sv);
170	npad[ix] = sv;
171	}	227	}
172	}	228	}
173	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
174	{
175	npad[ix] = SvREFCNT_inc (ppad[ix]);
176	}
177	else
178	{
179	SV *sv = NEWSV (0, 0);
180	SvPADTMP_on (sv);
181	npad[ix] = sv;
182	}
183	}
184		229
185	#if 0 /* return -ENOTUNDERSTOOD */
186	/* Now that vars are all in place, clone nested closures. */
187
188	for (ix = fpad; ix > 0; ix--) {
189	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
190	if (namesv
191	&& namesv != &PL_sv_undef
192	&& !(SvFLAGS(namesv) & SVf_FAKE)
193	&& *SvPVX(namesv) == '&'
194	&& CvCLONE(ppad[ix]))
195	{
196	CV *kid = cv_clone((CV*)ppad[ix]);
197	SvREFCNT_dec(ppad[ix]);
198	CvCLONE_on(kid);
199	SvPADMY_on(kid);
200	npad[ix] = (SV*)kid;
201	}
202	}
203	#endif
204
205	return newpadlist;
206	}
207
208	#ifdef MAY_FLUSH
209	STATIC AV *
210	free_padlist (AV *padlist)
211	{
212	/* may be during global destruction */
213	if (SvREFCNT(padlist))
214	{
215	I32 i = AvFILLp(padlist);
216	while (i >= 0)
217	{
218	SV **svp = av_fetch(padlist, i--, FALSE);
219	SV *sv = svp ? *svp : Nullsv;
220	if (sv)
221	SvREFCNT_dec(sv);
222	}
223
224	SvREFCNT_dec((SV*)padlist);	230	SvREFCNT_dec ((SV*)padlist);
225	}	231	}
226	}	232	}
227	#endif	233
		234	static int
		235	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		236	{
		237	AV *padlist;
		238	AV *av = (AV *)mg->mg_obj;
		239
		240	/* casting is fun. */
		241	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
		242	free_padlist (padlist);
		243
		244	SvREFCNT_dec (av);
		245
		246	return 0;
		247	}
		248
		249	#define PERL_MAGIC_coro PERL_MAGIC_ext
		250
		251	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
		252
		253	#define CORO_MAGIC(cv) \
		254	SvMAGIC (cv) \
		255	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		256	? SvMAGIC (cv) \
		257	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		258	: 0
228		259
229	/* the next two functions merely cache the padlists */	260	/* the next two functions merely cache the padlists */
230	STATIC void	261	static void
231	get_padlist (CV *cv)	262	get_padlist (CV *cv)
232	{	263	{
233	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);	264	MAGIC *mg = CORO_MAGIC (cv);
		265	AV *av;
234		266
235	if (he && AvFILLp ((AV *)*he) >= 0)	267	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
236	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);	268	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
237	else	269	else
		270	{
		271	#if PREFER_PERL_FUNCTIONS
		272	/* this is probably cleaner, but also slower? */
		273	CV *cp = Perl_cv_clone (cv);
		274	CvPADLIST (cv) = CvPADLIST (cp);
		275	CvPADLIST (cp) = 0;
		276	SvREFCNT_dec (cp);
		277	#else
238	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));	278	CvPADLIST (cv) = coro_clone_padlist (cv);
		279	#endif
		280	}
239	}	281	}
240		282
241	STATIC void	283	static void
242	put_padlist (CV *cv)	284	put_padlist (CV *cv)
243	{	285	{
244	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);	286	MAGIC *mg = CORO_MAGIC (cv);
		287	AV *av;
245		288
246	if (SvTYPE (*he) != SVt_PVAV)	289	if (!mg)
247	{
248	SvREFCNT_dec (*he);
249	*he = (SV *)newAV ();
250	}	290	{
251		291	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
252	av_push ((AV *)*he, (SV *)CvPADLIST (cv));	292	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
253	}	293	mg->mg_virtual = &vtbl_coro;
254		294	mg->mg_obj = (SV *)newAV ();
255	#ifdef MAY_FLUSH
256	STATIC void
257	flush_padlist_cache ()
258	{
259	HV *hv = padlist_cache;
260	padlist_cache = newHV ();
261
262	if (hv_iterinit (hv))
263	{	295	}
264	HE *he;
265	AV *padlist;
266		296
267	while (!!(he = hv_iternext (hv)))	297	av = (AV *)mg->mg_obj;
268	{
269	AV *av = (AV *)HeVAL(he);
270		298
271	/* casting is fun. */	299	if (AvFILLp (av) >= AvMAX (av))
272	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))	300	av_extend (av, AvMAX (av) + 1);
273	free_padlist (padlist);
274	}
275	}
276		301
277	SvREFCNT_dec (hv);	302	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
278	}	303	}
279	#endif
280		304
281	#define SB do {	305	#define SB do {
282	#define SE } while (0)	306	#define SE } while (0)
283		307
284	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE
285	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
286
287	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	308	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
288		309
289	static void	310	static void
290	load_state(pTHX_ Coro__State c)	311	load_perl (Coro__State c)
291	{	312	{
292	PL_dowarn = c->dowarn;	313	#define VAR(name,type) PL_ ## name = c->name;
293		314	# include "state.h"
294	PL_curstackinfo = c->curstackinfo;	315	#undef VAR
295	PL_curstack = c->curstack;
296	PL_mainstack = c->mainstack;
297	PL_stack_sp = c->stack_sp;
298	PL_op = c->op;
299	PL_curpad = c->curpad;
300	PL_stack_base = c->stack_base;
301	PL_stack_max = c->stack_max;
302	PL_tmps_stack = c->tmps_stack;
303	PL_tmps_floor = c->tmps_floor;
304	PL_tmps_ix = c->tmps_ix;
305	PL_tmps_max = c->tmps_max;
306	PL_markstack = c->markstack;
307	PL_markstack_ptr = c->markstack_ptr;
308	PL_markstack_max = c->markstack_max;
309	PL_scopestack = c->scopestack;
310	PL_scopestack_ix = c->scopestack_ix;
311	PL_scopestack_max = c->scopestack_max;
312	PL_savestack = c->savestack;
313	PL_savestack_ix = c->savestack_ix;
314	PL_savestack_max = c->savestack_max;
315	PL_retstack = c->retstack;
316	PL_retstack_ix = c->retstack_ix;
317	PL_retstack_max = c->retstack_max;
318	PL_curcop = c->curcop;
319	PL_start_env = c->start_env;
320	PL_top_env = c->top_env;
321		316
322	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	317	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
323	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	318	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
324	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	319	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		320	if (c->irssv)
		321	{
		322	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		323	SvREFCNT_dec (c->irssv);
		324	else
		325	{
		326	REPLACE_SV (PL_rs, c->irssv);
		327	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		328	sv_setsv (c->irssv_sv, PL_rs);
		329	}
		330	}
325		331
326	{	332	{
327	dSP;	333	dSP;
328	CV *cv;	334	CV *cv;
329		335
330	/* now do the ugly restore mess */	336	/* now do the ugly restore mess */
331	while ((cv = (CV *)POPs))	337	while ((cv = (CV *)POPs))
332	{	338	{
333	AV *padlist = (AV *)POPs;
334
335	if (padlist)
336	{
337	put_padlist (cv); /* mark this padlist as available */	339	put_padlist (cv); /* mark this padlist as available */
338	CvPADLIST(cv) = padlist;	340	CvDEPTH (cv) = PTR2IV (POPs);
339	#ifdef USE_THREADS	341	CvPADLIST (cv) = (AV *)POPs;
340	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
341	#endif
342	}
343
344	++CvDEPTH(cv);
345	}	342	}
346		343
347	PUTBACK;	344	PUTBACK;
348	}	345	}
349	}	346	}
350		347
351	static void	348	static void
352	save_state(pTHX_ Coro__State c, int flags)	349	save_perl (Coro__State c)
353	{	350	{
354	{	351	{
355	dSP;	352	dSP;
356	I32 cxix = cxstack_ix;	353	I32 cxix = cxstack_ix;
357	PERL_CONTEXT *ccstk = cxstack;	354	PERL_CONTEXT *ccstk = cxstack;
…		…
360	/*	357	/*
361	* the worst thing you can imagine happens first - we have to save	358	* the worst thing you can imagine happens first - we have to save
362	* (and reinitialize) all cv's in the whole callchain :(	359	* (and reinitialize) all cv's in the whole callchain :(
363	*/	360	*/
364		361
		362	EXTEND (SP, 3 + 1);
365	PUSHs (Nullsv);	363	PUSHs (Nullsv);
366	/* this loop was inspired by pp_caller */	364	/* this loop was inspired by pp_caller */
367	for (;;)	365	for (;;)
368	{	366	{
369	do	367	while (cxix >= 0)
370	{	368	{
371	PERL_CONTEXT *cx = &ccstk[cxix--];	369	PERL_CONTEXT *cx = &ccstk[cxix--];
372		370
373	if (CxTYPE(cx) == CXt_SUB)	371	if (CxTYPE (cx) == CXt_SUB)
374	{	372	{
375	CV *cv = cx->blk_sub.cv;	373	CV *cv = cx->blk_sub.cv;
		374
376	if (CvDEPTH(cv))	375	if (CvDEPTH (cv))
377	{	376	{
378	#ifdef USE_THREADS
379	/*XPUSHs ((SV *)CvOWNER(cv));*/
380	/*CvOWNER(cv) = 0;*/
381	/*error must unlock this cv etc.. etc...*/
382	#endif
383	EXTEND (SP, CvDEPTH(cv)*2);	377	EXTEND (SP, 3);
384
385	while (--CvDEPTH(cv))
386	{
387	/* this tells the restore code to increment CvDEPTH */
388	PUSHs (Nullsv);
389	PUSHs ((SV *)cv);
390	}
391
392	PUSHs ((SV *)CvPADLIST(cv));	378	PUSHs ((SV *)CvPADLIST (cv));
		379	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
393	PUSHs ((SV *)cv);	380	PUSHs ((SV *)cv);
394		381
		382	CvDEPTH (cv) = 0;
395	get_padlist (cv); /* this is a monster */	383	get_padlist (cv);
396	}	384	}
397	}	385	}
398	else if (CxTYPE(cx) == CXt_FORMAT)
399	{
400	/* I never used formats, so how should I know how these are implemented? */
401	/* my bold guess is as a simple, plain sub... */
402	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
403	}
404	}	386	}
405	while (cxix >= 0);
406		387
407	if (top_si->si_type == PERLSI_MAIN)	388	if (top_si->si_type == PERLSI_MAIN)
408	break;	389	break;
409		390
410	top_si = top_si->si_prev;	391	top_si = top_si->si_prev;
…		…
413	}	394	}
414		395
415	PUTBACK;	396	PUTBACK;
416	}	397	}
417		398
418	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	399	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
419	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	400	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
420	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	401	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		402	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
421		403
422	/* I have not the slightest idea of why av_reify is necessary */	404	#define VAR(name,type)c->name = PL_ ## name;
423	/* but if it's missing the defav contents magically get replaced sometimes */	405	# include "state.h"
424	if (c->defav)	406	#undef VAR
425	av_reify (c->defav);
426
427	c->dowarn = PL_dowarn;
428
429	c->curstackinfo = PL_curstackinfo;
430	c->curstack = PL_curstack;
431	c->mainstack = PL_mainstack;
432	c->stack_sp = PL_stack_sp;
433	c->op = PL_op;
434	c->curpad = PL_curpad;
435	c->stack_base = PL_stack_base;
436	c->stack_max = PL_stack_max;
437	c->tmps_stack = PL_tmps_stack;
438	c->tmps_floor = PL_tmps_floor;
439	c->tmps_ix = PL_tmps_ix;
440	c->tmps_max = PL_tmps_max;
441	c->markstack = PL_markstack;
442	c->markstack_ptr = PL_markstack_ptr;
443	c->markstack_max = PL_markstack_max;
444	c->scopestack = PL_scopestack;
445	c->scopestack_ix = PL_scopestack_ix;
446	c->scopestack_max = PL_scopestack_max;
447	c->savestack = PL_savestack;
448	c->savestack_ix = PL_savestack_ix;
449	c->savestack_max = PL_savestack_max;
450	c->retstack = PL_retstack;
451	c->retstack_ix = PL_retstack_ix;
452	c->retstack_max = PL_retstack_max;
453	c->curcop = PL_curcop;
454	c->start_env = PL_start_env;
455	c->top_env = PL_top_env;
456	}	407	}
457		408
458	/*	409	/*
459	* allocate various perl stacks. This is an exact copy	410	* allocate various perl stacks. This is an exact copy
460	* of perl.c:init_stacks, except that it uses less memory	411	* of perl.c:init_stacks, except that it uses less memory
461	* on the assumption that coroutines do not usually need	412	* on the (sometimes correct) assumption that coroutines do
462	* a lot of stackspace.	413	* not usually need a lot of stackspace.
463	*/	414	*/
464	STATIC void	415	#if PREFER_PERL_FUNCTIONS
		416	# define coro_init_stacks init_stacks
		417	#else
		418	static void
465	coro_init_stacks (pTHX)	419	coro_init_stacks ()
466	{	420	{
467	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	421	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
468	PL_curstackinfo->si_type = PERLSI_MAIN;	422	PL_curstackinfo->si_type = PERLSI_MAIN;
469	PL_curstack = PL_curstackinfo->si_stack;	423	PL_curstack = PL_curstackinfo->si_stack;
470	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	424	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
471		425
472	PL_stack_base = AvARRAY(PL_curstack);	426	PL_stack_base = AvARRAY(PL_curstack);
473	PL_stack_sp = PL_stack_base;	427	PL_stack_sp = PL_stack_base;
474	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	428	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
475		429
476	New(50,PL_tmps_stack,96,SV*);	430	New(50,PL_tmps_stack,128,SV*);
477	PL_tmps_floor = -1;	431	PL_tmps_floor = -1;
478	PL_tmps_ix = -1;	432	PL_tmps_ix = -1;
479	PL_tmps_max = 96;	433	PL_tmps_max = 128;
480		434
481	New(54,PL_markstack,16,I32);	435	New(54,PL_markstack,32,I32);
482	PL_markstack_ptr = PL_markstack;	436	PL_markstack_ptr = PL_markstack;
483	PL_markstack_max = PL_markstack + 16;	437	PL_markstack_max = PL_markstack + 32;
484		438
		439	#ifdef SET_MARK_OFFSET
485	SET_MARK_OFFSET;	440	SET_MARK_OFFSET;
		441	#endif
486		442
487	New(54,PL_scopestack,16,I32);	443	New(54,PL_scopestack,32,I32);
488	PL_scopestack_ix = 0;	444	PL_scopestack_ix = 0;
489	PL_scopestack_max = 16;	445	PL_scopestack_max = 32;
490		446
491	New(54,PL_savestack,96,ANY);	447	New(54,PL_savestack,64,ANY);
492	PL_savestack_ix = 0;	448	PL_savestack_ix = 0;
493	PL_savestack_max = 96;	449	PL_savestack_max = 64;
494		450
		451	#if !PERL_VERSION_ATLEAST (5,9,0)
495	New(54,PL_retstack,8,OP*);	452	New(54,PL_retstack,16,OP*);
496	PL_retstack_ix = 0;	453	PL_retstack_ix = 0;
497	PL_retstack_max = 8;	454	PL_retstack_max = 16;
		455	#endif
498	}	456	}
		457	#endif
499		458
500	/*	459	/*
501	* destroy the stacks, the callchain etc...	460	* destroy the stacks, the callchain etc...
502	* still there is a memleak of 128 bytes...
503	*/	461	*/
504	STATIC void	462	static void
505	destroy_stacks(pTHX)	463	coro_destroy_stacks ()
506	{	464	{
507	/* is this ugly, I ask? */	465	if (!IN_DESTRUCT)
508	while (PL_scopestack_ix)	466	{
509	LEAVE;	467	/* restore all saved variables and stuff */
		468	LEAVE_SCOPE (0);
		469	assert (PL_tmps_floor == -1);
510		470
511	/* sure it is, but more important: is it correct?? :/ */	471	/* free all temporaries */
512	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
513	FREETMPS;	472	FREETMPS;
		473	assert (PL_tmps_ix == -1);
		474
		475	POPSTACK_TO (PL_mainstack);
		476	}
514		477
515	while (PL_curstackinfo->si_next)	478	while (PL_curstackinfo->si_next)
516	PL_curstackinfo = PL_curstackinfo->si_next;	479	PL_curstackinfo = PL_curstackinfo->si_next;
517		480
518	while (PL_curstackinfo)	481	while (PL_curstackinfo)
519	{	482	{
520	PERL_SI *p = PL_curstackinfo->si_prev;	483	PERL_SI *p = PL_curstackinfo->si_prev;
521		484
522	{	485	if (!IN_DESTRUCT)
523	dSP;
524	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
525	PUTBACK; /* possibly superfluous */
526	}
527
528	dounwind(-1);
529
530	SvREFCNT_dec(PL_curstackinfo->si_stack);	486	SvREFCNT_dec (PL_curstackinfo->si_stack);
		487
531	Safefree(PL_curstackinfo->si_cxstack);	488	Safefree (PL_curstackinfo->si_cxstack);
532	Safefree(PL_curstackinfo);	489	Safefree (PL_curstackinfo);
533	PL_curstackinfo = p;	490	PL_curstackinfo = p;
534	}	491	}
535		492
536	Safefree(PL_tmps_stack);	493	Safefree (PL_tmps_stack);
537	Safefree(PL_markstack);	494	Safefree (PL_markstack);
538	Safefree(PL_scopestack);	495	Safefree (PL_scopestack);
539	Safefree(PL_savestack);	496	Safefree (PL_savestack);
		497	#if !PERL_VERSION_ATLEAST (5,9,0)
540	Safefree(PL_retstack);	498	Safefree (PL_retstack);
541	}
542
543	static void
544	allocate_stack (Coro__State ctx, int alloc)
545	{
546	coro_stack *stack;
547
548	New (0, stack, 1, coro_stack);
549
550	stack->refcnt = 1;
551	stack->usecnt = 1;
552	stack->gencnt = ctx->gencnt = 0;
553	if (alloc)
554	{
555	#ifdef HAVE_MMAP
556	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write for us */
557	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
558	if (stack->sptr == (void *)-1)
559	#endif	499	#endif
560	{
561	/*FIXME*//*D*//* reasonable stack size! */
562	stack->ssize = -4096 * sizeof (long);
563	New (0, stack->sptr, 4096, long);
564	}
565	}
566	else
567	stack->sptr = 0;
568
569	ctx->stack = stack;
570	}	500	}
571		501
572	static void	502	static void
573	deallocate_stack (Coro__State ctx)	503	setup_coro (struct coro *coro)
574	{
575	coro_stack *stack = ctx->stack;
576
577	ctx->stack = 0;
578
579	if (stack)
580	{
581	if (!--stack->refcnt)
582	{
583	#ifdef HAVE_MMAP
584	if (stack->ssize > 0 && stack->sptr)
585	munmap (stack->sptr, stack->ssize);
586	else
587	#else
588	Safefree (stack->sptr);
589	#endif
590	Safefree (stack);
591	}
592	else if (ctx->gencnt == stack->gencnt)
593	--stack->usecnt;
594	}
595	}
596
597	static void
598	setup_coro (void *arg)
599	{	504	{
600	/*	505	/*
601	* emulate part of the perl startup here.	506	* emulate part of the perl startup here.
602	*/	507	*/
		508
		509	coro_init_stacks ();
		510
		511	PL_curcop = &PL_compiling;
		512	PL_in_eval = EVAL_NULL;
		513	PL_curpm = 0;
		514	PL_localizing = 0;
		515	PL_dirty = 0;
		516	PL_restartop = 0;
		517
		518	{
		519	dSP;
		520	LOGOP myop;
		521
		522	SvREFCNT_dec (GvAV (PL_defgv));
		523	GvAV (PL_defgv) = coro->args; coro->args = 0;
		524
		525	Zero (&myop, 1, LOGOP);
		526	myop.op_next = Nullop;
		527	myop.op_flags = OPf_WANT_VOID;
		528
		529	PUSHMARK (SP);
		530	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		531	PUTBACK;
		532	PL_op = (OP *)&myop;
		533	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		534	SPAGAIN;
		535	}
		536
		537	ENTER; /* necessary e.g. for dounwind */
		538	}
		539
		540	static void
		541	free_coro_mortal ()
		542	{
		543	if (coro_mortal)
		544	{
		545	SvREFCNT_dec (coro_mortal);
		546	coro_mortal = 0;
		547	}
		548	}
		549
		550	/* inject a fake call to Coro::State::_cctx_init into the execution */
		551	static void NOINLINE
		552	prepare_cctx (coro_cctx *cctx)
		553	{
603	dSP;	554	dSP;
604	Coro__State ctx = (Coro__State)arg;	555	LOGOP myop;
605	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
606		556
607	coro_init_stacks (aTHX);	557	Zero (&myop, 1, LOGOP);
608	JMPENV_BOOTSTRAP;	558	myop.op_next = PL_op;
		559	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		560
		561	PUSHMARK (SP);
		562	EXTEND (SP, 2);
		563	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		564	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		565	PUTBACK;
		566	PL_op = (OP *)&myop;
		567	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
609	SPAGAIN;	568	SPAGAIN;
610
611	/*PL_curcop = 0;*/
612	SvREFCNT_dec (GvAV (PL_defgv));
613	GvAV (PL_defgv) = ctx->args;
614
615	if (ctx->stack)
616	{
617	ctx->cursp = 0;
618
619	PUSHMARK(SP);
620	PUTBACK;
621	(void) call_sv (sub_init, G_VOID|G_NOARGS);
622	croak ("FATAL: CCTXT coroutine returned!");
623	}
624	else
625	{
626	UNOP myop;
627
628	PL_op = (OP *)&myop;
629
630	Zero(&myop, 1, UNOP);
631	myop.op_next = Nullop;
632	myop.op_flags = OPf_WANT_VOID;
633
634	PUSHMARK(SP);
635	XPUSHs (sub_init);
636	/*
637	* the next line is slightly wrong, as PL_op->op_next
638	* is actually being executed so we skip the first op.
639	* that doesn't matter, though, since it is only
640	* pp_nextstate and we never return...
641	* ah yes, and I don't care anyways ;)
642	*/
643	PUTBACK;
644	PL_op = pp_entersub();
645	SPAGAIN;
646
647	ENTER; /* necessary e.g. for dounwind */
648	}
649	}	569	}
650		570
651	static void	571	static void
652	continue_coro (void *arg)	572	coro_run (void *arg)
653	{	573	{
		574	/* coro_run is the alternative tail of transfer(), so unlock here. */
		575	UNLOCK;
		576
654	/*	577	/*
655	* this is a _very_ stripped down perl interpreter ;)	578	* this is a _very_ stripped down perl interpreter ;)
656	*/	579	*/
657	Coro__State ctx = (Coro__State)arg;	580	PL_top_env = &PL_start_env;
658		581
659	ctx->cursp = 0;	582	/* inject call to cctx_init */
660	PL_op = PL_op->op_next;	583	prepare_cctx ((coro_cctx *)arg);
661	CALLRUNOPS(aTHX);	584
662	/*NORETURN*/	585	/* somebody will hit me for both perl_run and PL_restartop */
		586	PL_restartop = PL_op;
		587	perl_run (PL_curinterp);
		588
		589	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
663	abort ();	590	abort ();
664	}	591	}
665		592
666	STATIC void	593	static coro_cctx *
		594	cctx_new ()
		595	{
		596	coro_cctx *cctx;
		597
		598	++cctx_count;
		599
		600	Newz (0, cctx, 1, coro_cctx);
		601
		602	#if HAVE_MMAP
		603
		604	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		605	/* mmap supposedly does allocate-on-write for us */
		606	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		607
		608	if (cctx->sptr == (void *)-1)
		609	{
		610	perror ("FATAL: unable to mmap stack for coroutine");
		611	_exit (EXIT_FAILURE);
		612	}
		613
		614	# if STACKGUARD
		615	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		616	# endif
		617
		618	#else
		619
		620	cctx->ssize = STACKSIZE * (long)sizeof (long);
		621	New (0, cctx->sptr, STACKSIZE, long);
		622
		623	if (!cctx->sptr)
		624	{
		625	perror ("FATAL: unable to malloc stack for coroutine");
		626	_exit (EXIT_FAILURE);
		627	}
		628
		629	#endif
		630
		631	#if USE_VALGRIND
		632	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		633	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		634	cctx->ssize + (char *)cctx->sptr
		635	);
		636	#endif
		637
		638	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		639
		640	return cctx;
		641	}
		642
		643	static void
		644	cctx_destroy (coro_cctx *cctx)
		645	{
		646	if (!cctx)
		647	return;
		648
		649	--cctx_count;
		650
		651	#if USE_VALGRIND
		652	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		653	#endif
		654
		655	#if HAVE_MMAP
		656	munmap (cctx->sptr, cctx->ssize);
		657	#else
		658	Safefree (cctx->sptr);
		659	#endif
		660
		661	Safefree (cctx);
		662	}
		663
		664	static coro_cctx *
		665	cctx_get ()
		666	{
		667	coro_cctx *cctx;
		668
		669	if (cctx_first)
		670	{
		671	cctx = cctx_first;
		672	cctx_first = cctx->next;
		673	--cctx_idle;
		674	}
		675	else
		676	{
		677	cctx = cctx_new ();
		678	PL_op = PL_op->op_next;
		679	}
		680
		681	return cctx;
		682	}
		683
		684	static void
		685	cctx_put (coro_cctx *cctx)
		686	{
		687	/* free another cctx if overlimit */
		688	if (cctx_idle >= MAX_IDLE_CCTX)
		689	{
		690	coro_cctx *first = cctx_first;
		691	cctx_first = first->next;
		692	--cctx_idle;
		693
		694	assert (!first->inuse);
		695	cctx_destroy (first);
		696	}
		697
		698	++cctx_idle;
		699	cctx->next = cctx_first;
		700	cctx_first = cctx;
		701	}
		702
		703	/* never call directly, always through the coro_state_transfer global variable */
		704	static void NOINLINE
667	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	705	transfer (struct coro *prev, struct coro *next)
668	{	706	{
669	dSP;
670	dSTACKLEVEL;	707	dSTACKLEVEL;
671		708
		709	/* sometimes transfer is only called to set idle_sp */
		710	if (!next)
		711	{
		712	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		713	assert (((coro_cctx *)prev)->top_env = PL_top_env); /* just for the side effetc when assert is enabled */
		714	}
672	if (prev != next)	715	else if (prev != next)
673	{	716	{
674	if (next->mainstack)	717	coro_cctx *prev__cctx;
		718
		719	if (prev->flags & CF_NEW)
675	{	720	{
676	SAVE (prev, flags);	721	/* create a new empty context */
677	LOAD (next);	722	Newz (0, prev->cctx, 1, coro_cctx);
678		723	prev->cctx->inuse = 1;
679	/* mark this state as in-use */	724	prev->flags &= ~CF_NEW;
680	next->mainstack = 0;	725	prev->flags |= CF_RUNNING;
681	next->tmps_ix = -2;
682
683	/* stacklevel changed? if yes, grab the stack for us! */
684	if (flags & TRANSFER_SAVE_CCTXT)
685	{
686	if (!prev->stack)
687	allocate_stack (prev, 0);
688	else if (prev->cursp != stacklevel
689	&& prev->stack->usecnt > 1)
690	{
691	prev->gencnt = ++prev->stack->gencnt;
692	prev->stack->usecnt = 1;
693	}
694
695	/* has our stack been invalidated? */
696	if (next->stack && next->stack->gencnt != next->gencnt)
697	{
698	deallocate_stack (next);
699	allocate_stack (next, 1);
700	coro_create (&(next->stack->cctx),
701	continue_coro, (void *)next,
702	next->stack->sptr, labs (next->stack->ssize));
703	}
704
705	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
706	}
707
708	}	726	}
709	else if (next->tmps_ix == -2)	727
710	croak ("tried to transfer to running coroutine");	728	/*TODO: must not croak here */
		729	if (!prev->flags & CF_RUNNING)
		730	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		731
		732	if (next->flags & CF_RUNNING)
		733	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		734
		735	prev->flags &= ~CF_RUNNING;
		736	next->flags |= CF_RUNNING;
		737
		738	LOCK;
		739
		740	if (next->flags & CF_NEW)
		741	{
		742	/* need to start coroutine */
		743	next->flags &= ~CF_NEW;
		744	/* first get rid of the old state */
		745	save_perl (prev);
		746	/* setup coroutine call */
		747	setup_coro (next);
		748	/* need a new stack */
		749	assert (!next->cctx);
		750	}
711	else	751	else
712	{	752	{
713	SAVE (prev, -1); /* first get rid of the old state */	753	/* coroutine already started */
714		754	save_perl (prev);
715	if (flags & TRANSFER_SAVE_CCTXT)	755	load_perl (next);
716	{
717	if (!prev->stack)
718	allocate_stack (prev, 0);
719
720	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
721	{
722	setup_coro (next);
723
724	prev->stack->refcnt++;
725	prev->stack->usecnt++;
726	next->stack = prev->stack;
727	next->gencnt = prev->gencnt;
728	}
729	else
730	{
731	allocate_stack (next, 1);
732	coro_create (&(next->stack->cctx),
733	setup_coro, (void *)next,
734	next->stack->sptr, labs (next->stack->ssize));
735	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
736	}
737	}
738	else
739	setup_coro (next);
740	}	756	}
		757
		758	prev__cctx = prev->cctx;
		759
		760	/* possibly "free" the cctx */
		761	if (prev__cctx->idle_sp == STACKLEVEL)
		762	{
		763	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		764	assert (PL_top_env == prev__cctx->top_env);
		765
		766	prev->cctx = 0;
		767
		768	cctx_put (prev__cctx);
		769	prev__cctx->inuse = 0;
		770	}
		771
		772	if (!next->cctx)
		773	{
		774	next->cctx = cctx_get ();
		775	assert (!next->cctx->inuse);
		776	next->cctx->inuse = 1;
		777	}
		778
		779	if (prev__cctx != next->cctx)
		780	{
		781	prev__cctx->top_env = PL_top_env;
		782	PL_top_env = next->cctx->top_env;
		783	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		784	}
		785
		786	free_coro_mortal ();
		787
		788	UNLOCK;
		789	}
		790	}
		791
		792	struct transfer_args
		793	{
		794	struct coro *prev, *next;
		795	};
		796
		797	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		798
		799	static void
		800	coro_state_destroy (struct coro *coro)
		801	{
		802	if (coro->refcnt--)
		803	return;
		804
		805	if (coro->mainstack && coro->mainstack != main_mainstack)
		806	{
		807	struct coro temp;
		808	Zero (&temp, 1, struct coro);
		809	temp.save = CORO_SAVE_ALL;
		810
		811	if (coro->flags & CF_RUNNING)
		812	croak ("FATAL: tried to destroy currently running coroutine");
		813
		814	save_perl (&temp);
		815	load_perl (coro);
		816
		817	coro_destroy_stacks ();
		818
		819	load_perl (&temp); /* this will get rid of defsv etc.. */
		820
		821	coro->mainstack = 0;
		822	}
		823
		824	cctx_destroy (coro->cctx);
		825	SvREFCNT_dec (coro->args);
		826	Safefree (coro);
		827	}
		828
		829	static int
		830	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		831	{
		832	struct coro *coro = (struct coro *)mg->mg_ptr;
		833	mg->mg_ptr = 0;
		834
		835	coro_state_destroy (coro);
		836
		837	return 0;
		838	}
		839
		840	static int
		841	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		842	{
		843	struct coro *coro = (struct coro *)mg->mg_ptr;
		844
		845	++coro->refcnt;
		846
		847	return 0;
		848	}
		849
		850	static MGVTBL coro_state_vtbl = {
		851	0, 0, 0, 0,
		852	coro_state_clear,
		853	0,
		854	#ifdef MGf_DUP
		855	coro_state_dup,
		856	#else
		857	# define MGf_DUP 0
		858	#endif
		859	};
		860
		861	static struct coro *
		862	SvSTATE (SV *coro)
		863	{
		864	HV *stash;
		865	MAGIC *mg;
		866
		867	if (SvROK (coro))
		868	coro = SvRV (coro);
		869
		870	stash = SvSTASH (coro);
		871	if (stash != coro_stash && stash != coro_state_stash)
		872	{
		873	/* very slow, but rare, check */
		874	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		875	croak ("Coro::State object required");
		876	}
		877
		878	mg = SvMAGIC (coro);
		879	assert (mg->mg_type == PERL_MAGIC_ext);
		880	return (struct coro *)mg->mg_ptr;
		881	}
		882
		883	static void
		884	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		885	{
		886	ta->prev = SvSTATE (prev_sv);
		887	ta->next = SvSTATE (next_sv);
		888	}
		889
		890	static void
		891	api_transfer (SV *prev_sv, SV *next_sv)
		892	{
		893	struct transfer_args ta;
		894
		895	prepare_transfer (&ta, prev_sv, next_sv);
		896	TRANSFER (ta);
		897	}
		898
		899	static int
		900	api_save (SV *coro_sv, int new_save)
		901	{
		902	struct coro *coro = SvSTATE (coro_sv);
		903	int old_save = coro->save;
		904
		905	if (new_save >= 0)
		906	coro->save = new_save;
		907
		908	return old_save;
		909	}
		910
		911	/** Coro ********************************************************************/
		912
		913	#define PRIO_MAX 3
		914	#define PRIO_HIGH 1
		915	#define PRIO_NORMAL 0
		916	#define PRIO_LOW -1
		917	#define PRIO_IDLE -3
		918	#define PRIO_MIN -4
		919
		920	/* for Coro.pm */
		921	static SV *coro_current;
		922	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		923	static int coro_nready;
		924
		925	static void
		926	coro_enq (SV *coro_sv)
		927	{
		928	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		929	coro_nready++;
		930	}
		931
		932	static SV *
		933	coro_deq (int min_prio)
		934	{
		935	int prio = PRIO_MAX - PRIO_MIN;
		936
		937	min_prio -= PRIO_MIN;
		938	if (min_prio < 0)
		939	min_prio = 0;
		940
		941	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		942	if (AvFILLp (coro_ready [prio]) >= 0)
		943	{
		944	coro_nready--;
		945	return av_shift (coro_ready [prio]);
741	}	946	}
742		947
743	next->cursp = stacklevel;	948	return 0;
		949	}
		950
		951	static int
		952	api_ready (SV *coro_sv)
		953	{
		954	struct coro *coro;
		955
		956	if (SvROK (coro_sv))
		957	coro_sv = SvRV (coro_sv);
		958
		959	coro = SvSTATE (coro_sv);
		960
		961	if (coro->flags & CF_READY)
		962	return 0;
		963
		964	coro->flags |= CF_READY;
		965
		966	LOCK;
		967	coro_enq (SvREFCNT_inc (coro_sv));
		968	UNLOCK;
		969
		970	return 1;
		971	}
		972
		973	static int
		974	api_is_ready (SV *coro_sv)
		975	{
		976	return !!(SvSTATE (coro_sv)->flags & CF_READY);
		977	}
		978
		979	static void
		980	prepare_schedule (struct transfer_args *ta)
		981	{
		982	SV *prev, *next;
		983
		984	for (;;)
		985	{
		986	LOCK;
		987	next = coro_deq (PRIO_MIN);
		988	UNLOCK;
		989
		990	if (next)
		991	break;
		992
		993	{
		994	dSP;
		995
		996	ENTER;
		997	SAVETMPS;
		998
		999	PUSHMARK (SP);
		1000	PUTBACK;
		1001	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1002
		1003	FREETMPS;
		1004	LEAVE;
		1005	}
		1006	}
		1007
		1008	prev = SvRV (coro_current);
		1009	SvRV_set (coro_current, next);
		1010
		1011	/* free this only after the transfer */
		1012	LOCK;
		1013	free_coro_mortal ();
		1014	UNLOCK;
		1015	coro_mortal = prev;
		1016
		1017	assert (!SvROK(prev));//D
		1018	assert (!SvROK(next));//D
		1019
		1020	ta->prev = SvSTATE (prev);
		1021	ta->next = SvSTATE (next);
		1022
		1023	assert (ta->next->flags & CF_READY);
		1024	ta->next->flags &= ~CF_READY;
		1025	}
		1026
		1027	static void
		1028	prepare_cede (struct transfer_args *ta)
		1029	{
		1030	api_ready (coro_current);
		1031	prepare_schedule (ta);
		1032	}
		1033
		1034	static int
		1035	prepare_cede_notself (struct transfer_args *ta)
		1036	{
		1037	if (coro_nready)
		1038	{
		1039	SV *prev = SvRV (coro_current);
		1040	prepare_schedule (ta);
		1041	api_ready (prev);
		1042	return 1;
		1043	}
		1044	else
		1045	return 0;
		1046	}
		1047
		1048	static void
		1049	api_schedule (void)
		1050	{
		1051	struct transfer_args ta;
		1052
		1053	prepare_schedule (&ta);
		1054	TRANSFER (ta);
		1055	}
		1056
		1057	static int
		1058	api_cede (void)
		1059	{
		1060	struct transfer_args ta;
		1061
		1062	prepare_cede (&ta);
		1063
		1064	if (ta.prev != ta.next)
		1065	{
		1066	TRANSFER (ta);
		1067	return 1;
		1068	}
		1069	else
		1070	return 0;
		1071	}
		1072
		1073	static int
		1074	api_cede_notself (void)
		1075	{
		1076	struct transfer_args ta;
		1077
		1078	if (prepare_cede_notself (&ta))
		1079	{
		1080	TRANSFER (ta);
		1081	return 1;
		1082	}
		1083	else
		1084	return 0;
744	}	1085	}
745		1086
746	MODULE = Coro::State PACKAGE = Coro::State	1087	MODULE = Coro::State PACKAGE = Coro::State
747		1088
748	PROTOTYPES: ENABLE	1089	PROTOTYPES: DISABLE
749		1090
750	BOOT:	1091	BOOT:
751	{ /* {} necessary for stoopid perl-5.6.x */	1092	{
752	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1093	#ifdef USE_ITHREADS
753	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1094	MUTEX_INIT (&coro_mutex);
		1095	#endif
		1096	BOOT_PAGESIZE;
		1097
754	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1098	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
755		1099
756	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1100	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
757	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1101	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
758	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1102	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1103	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
759	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1104	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
760
761	if (!padlist_cache)
762	padlist_cache = newHV ();
763		1105
764	main_mainstack = PL_mainstack;	1106	main_mainstack = PL_mainstack;
765	}
766		1107
767	Coro::State	1108	coroapi.ver = CORO_API_VERSION;
768	_newprocess(args)	1109	coroapi.transfer = api_transfer;
769	SV * args	1110
770	PROTOTYPE: $	1111	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1112	}
		1113
		1114	SV *
		1115	new (char *klass, ...)
771	CODE:	1116	CODE:
772	Coro__State coro;	1117	{
		1118	struct coro *coro;
		1119	HV *hv;
		1120	int i;
773		1121
774	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
775	croak ("Coro::State::_newprocess expects an arrayref");
776
777	New (0, coro, 1, struct coro);	1122	Newz (0, coro, 1, struct coro);
		1123	coro->args = newAV ();
		1124	coro->save = CORO_SAVE_ALL;
		1125	coro->flags = CF_NEW;
778		1126
779	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1127	hv = newHV ();
780	coro->mainstack = 0; /* actual work is done inside transfer */	1128	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
781	coro->stack = 0;	1129	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
782		1130
783	RETVAL = coro;	1131	for (i = 1; i < items; i++)
		1132	av_push (coro->args, newSVsv (ST (i)));
		1133	}
784	OUTPUT:	1134	OUTPUT:
785	RETVAL	1135	RETVAL
786		1136
		1137	int
		1138	save (SV *coro, int new_save = -1)
		1139	CODE:
		1140	RETVAL = api_save (coro, new_save);
		1141	OUTPUT:
		1142	RETVAL
		1143
787	void	1144	void
788	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1145	_set_stacklevel (...)
789	Coro::State_or_hashref prev	1146	ALIAS:
790	Coro::State_or_hashref next	1147	Coro::State::transfer = 1
791	int flags	1148	Coro::schedule = 2
792	PROTOTYPE: @	1149	Coro::cede = 3
		1150	Coro::cede_notself = 4
793	CODE:	1151	CODE:
794	transfer (aTHX_ prev, next, flags);	1152	{
		1153	struct transfer_args ta;
		1154
		1155	switch (ix)
		1156	{
		1157	case 0:
		1158	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1159	ta.next = 0;
		1160	break;
		1161
		1162	case 1:
		1163	if (items != 2)
		1164	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1165
		1166	prepare_transfer (&ta, ST (0), ST (1));
		1167	break;
		1168
		1169	case 2:
		1170	prepare_schedule (&ta);
		1171	break;
		1172
		1173	case 3:
		1174	prepare_cede (&ta);
		1175	break;
		1176
		1177	case 4:
		1178	if (!prepare_cede_notself (&ta))
		1179	XSRETURN_EMPTY;
		1180
		1181	break;
		1182	}
		1183
		1184	BARRIER;
		1185	TRANSFER (ta);
		1186	}
795		1187
796	void	1188	void
797	DESTROY(coro)	1189	_clone_state_from (SV *dst, SV *src)
798	Coro::State coro	1190	CODE:
		1191	{
		1192	struct coro *coro_src = SvSTATE (src);
		1193
		1194	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1195
		1196	++coro_src->refcnt;
		1197	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1198	}
		1199
		1200	void
		1201	_exit (code)
		1202	int code
		1203	PROTOTYPE: $
		1204	CODE:
		1205	_exit (code);
		1206
		1207	int
		1208	cctx_count ()
		1209	CODE:
		1210	RETVAL = cctx_count;
		1211	OUTPUT:
		1212	RETVAL
		1213
		1214	int
		1215	cctx_idle ()
		1216	CODE:
		1217	RETVAL = cctx_idle;
		1218	OUTPUT:
		1219	RETVAL
		1220
		1221	MODULE = Coro::State PACKAGE = Coro
		1222
		1223	BOOT:
		1224	{
		1225	int i;
		1226
		1227	coro_stash = gv_stashpv ("Coro", TRUE);
		1228
		1229	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1230	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1231	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1232	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1233	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1234	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1235
		1236	coro_current = get_sv ("Coro::current", FALSE);
		1237	SvREADONLY_on (coro_current);
		1238
		1239	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1240	coro_ready[i] = newAV ();
		1241
		1242	{
		1243	SV *sv = perl_get_sv("Coro::API", 1);
		1244
		1245	coroapi.schedule = api_schedule;
		1246	coroapi.save = api_save;
		1247	coroapi.cede = api_cede;
		1248	coroapi.cede_notself = api_cede_notself;
		1249	coroapi.ready = api_ready;
		1250	coroapi.is_ready = api_is_ready;
		1251	coroapi.nready = &coro_nready;
		1252	coroapi.current = coro_current;
		1253
		1254	GCoroAPI = &coroapi;
		1255	sv_setiv (sv, (IV)&coroapi);
		1256	SvREADONLY_on (sv);
		1257	}
		1258	}
		1259
		1260	void
		1261	_set_current (SV *current)
		1262	PROTOTYPE: $
		1263	CODE:
		1264	SvREFCNT_dec (SvRV (coro_current));
		1265	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1266
		1267	int
		1268	prio (Coro::State coro, int newprio = 0)
		1269	ALIAS:
		1270	nice = 1
799	CODE:	1271	CODE:
		1272	{
		1273	RETVAL = coro->prio;
800		1274
801	if (coro->mainstack && coro->mainstack != main_mainstack)	1275	if (items > 1)
802	{	1276	{
803	struct coro temp;	1277	if (ix)
		1278	newprio = coro->prio - newprio;
804		1279
805	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1280	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
806	LOAD(aTHX_ coro);	1281	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
807		1282
808	destroy_stacks (aTHX);	1283	coro->prio = newprio;
809
810	LOAD((&temp)); /* this will get rid of defsv etc.. */
811
812	coro->mainstack = 0;
813	}	1284	}
		1285	}
		1286	OUTPUT:
		1287	RETVAL
814		1288
815	deallocate_stack (coro);	1289	SV *
		1290	ready (SV *self)
		1291	PROTOTYPE: $
		1292	CODE:
		1293	RETVAL = boolSV (api_ready (self));
		1294	OUTPUT:
		1295	RETVAL
816		1296
817	Safefree (coro);	1297	SV *
		1298	is_ready (SV *self)
		1299	PROTOTYPE: $
		1300	CODE:
		1301	RETVAL = boolSV (api_is_ready (self));
		1302	OUTPUT:
		1303	RETVAL
		1304
		1305	int
		1306	nready (...)
		1307	PROTOTYPE:
		1308	CODE:
		1309	RETVAL = coro_nready;
		1310	OUTPUT:
		1311	RETVAL
		1312
		1313	MODULE = Coro::State PACKAGE = Coro::AIO
		1314
		1315	SV *
		1316	_get_state ()
		1317	CODE:
		1318	{
		1319	struct io_state *data;
		1320
		1321	RETVAL = newSV (sizeof (struct io_state));
		1322	data = (struct io_state *)SvPVX (RETVAL);
		1323	SvCUR_set (RETVAL, sizeof (struct io_state));
		1324	SvPOK_only (RETVAL);
		1325
		1326	data->errorno = errno;
		1327	data->laststype = PL_laststype;
		1328	data->laststatval = PL_laststatval;
		1329	data->statcache = PL_statcache;
		1330	}
		1331	OUTPUT:
		1332	RETVAL
818		1333
819	void	1334	void
820	flush()	1335	_set_state (char *data_)
		1336	PROTOTYPE: $
821	CODE:	1337	CODE:
822	#ifdef MAY_FLUSH	1338	{
823	flush_padlist_cache ();	1339	struct io_state *data = (void *)data_;
824	#endif
825		1340
826	MODULE = Coro::State PACKAGE = Coro::Cont	1341	errno = data->errorno;
		1342	PL_laststype = data->laststype;
		1343	PL_laststatval = data->laststatval;
		1344	PL_statcache = data->statcache;
		1345	}
827		1346
828	# this is slightly dirty
829
830	void
831	yield(...)
832	PROTOTYPE: @
833	CODE:
834	static SV *returnstk;
835	SV *sv;
836	AV *defav = GvAV (PL_defgv);
837	struct coro *prev, *next;
838
839	if (!returnstk)
840	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
841
842	/* set up @_ -- ugly */
843	av_clear (defav);
844	av_fill (defav, items - 1);
845	while (items--)
846	av_store (defav, items, SvREFCNT_inc (ST(items)));
847
848	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
849	sv = av_pop ((AV *)SvRV (returnstk));
850	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
851	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
852	SvREFCNT_dec (sv);
853
854	transfer(aTHX_ prev, next, 0);
855

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