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Comparing Coro/Coro/State.xs (file contents):
Revision 1.16 by root, Wed Jul 25 04:26:55 2001 UTC vs.
Revision 1.126 by root, Tue Dec 12 04:19:56 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	#if USE_VALGRIND
		10	# include <valgrind/valgrind.h>
		11	#endif
		12
		13	/* the maximum number of idle cctx that will be pooled */
		14	#define MAX_IDLE_CCTX 8
		15
		16	#define PERL_VERSION_ATLEAST(a,b,c) \
		17	(PERL_REVISION > (a) \
		18	|| (PERL_REVISION == (a) \
		19	&& (PERL_VERSION > (b) \
		20	|| (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
		21
		22	#if !PERL_VERSION_ATLEAST (5,6,0)
		23	# ifndef PL_ppaddr
		24	# define PL_ppaddr ppaddr
		25	# endif
		26	# ifndef call_sv
		27	# define call_sv perl_call_sv
		28	# endif
		29	# ifndef get_sv
		30	# define get_sv perl_get_sv
		31	# endif
		32	# ifndef get_cv
		33	# define get_cv perl_get_cv
		34	# endif
		35	# ifndef IS_PADGV
		36	# define IS_PADGV(v) 0
		37	# endif
		38	# ifndef IS_PADCONST
		39	# define IS_PADCONST(v) 0
		40	# endif
		41	#endif
		42
		43	/* 5.8.7 */
		44	#ifndef SvRV_set
		45	# define SvRV_set(s,v) SvRV(s) = (v)
		46	#endif
		47
		48	#include <stdio.h>
		49	#include <errno.h>
		50	#include <assert.h>
		51
		52	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		53	# undef STACKGUARD
		54	#endif
		55
		56	#ifndef STACKGUARD
		57	# define STACKGUARD 0
		58	#endif
6		59
7	#ifdef HAVE_MMAP	60	#ifdef HAVE_MMAP
8	# include <unistd.h>	61	# include <unistd.h>
9	# include <sys/mman.h>	62	# include <sys/mman.h>
10	# ifndef MAP_ANON
11	# ifdef MAP_ANONYMOUS	63	# ifndef MAP_ANONYMOUS
12	# define MAP_ANON MAP_ANONYMOUS	64	# ifdef MAP_ANON
		65	# define MAP_ANONYMOUS MAP_ANON
13	# else	66	# else
14	# undef HAVE_MMAP	67	# undef HAVE_MMAP
15	# endif	68	# endif
16	# endif	69	# endif
		70	# include <limits.h>
		71	# ifndef PAGESIZE
		72	# define PAGESIZE pagesize
		73	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		74	static long pagesize;
		75	# else
		76	# define BOOT_PAGESIZE (void)0
17	#endif	77	# 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	78	#else
30	# define TRANSFER_LAZY_STACK 0x00000000	79	# define PAGESIZE 0
		80	# define BOOT_PAGESIZE (void)0
31	#endif	81	#endif
32		82
33	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \
34	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)
35
36	#define SUB_INIT "Coro::State::initialize"
37	#define UCORO_STATE "_coro_state"
38
39	/* The next macro should delcare a variable stacklevel that contains and approximation	83	/* 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	84	* to the current C stack pointer. Its property is that it changes with each call
41	* and should be unique. */	85	* and should be unique. */
		86	#define dSTACKLEVEL int stacklevel
42	#define dSTACKLEVEL void *stacklevel = &stacklevel	87	#define STACKLEVEL ((void *)&stacklevel)
43		88
44	#define labs(l) ((l) >= 0 ? (l) : -(l))	89	#define IN_DESTRUCT (PL_main_cv == Nullcv)
45		90
46	/* this is actually not only the c stack but also c registers etc... */	91	#if __GNUC__ >= 3
		92	# define attribute(x) __attribute__(x)
		93	#else
		94	# define attribute(x)
		95	#endif
		96
		97	#define NOINLINE attribute ((noinline))
		98
		99	#include "CoroAPI.h"
		100
		101	#ifdef USE_ITHREADS
		102	static perl_mutex coro_mutex;
		103	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		104	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		105	#else
		106	# define LOCK (void)0
		107	# define UNLOCK (void)0
		108	#endif
		109
		110	struct io_state
		111	{
		112	int errorno;
		113	I32 laststype;
		114	int laststatval;
		115	Stat_t statcache;
		116	};
		117
		118	static struct CoroAPI coroapi;
		119	static AV *main_mainstack; /* used to differentiate between $main and others */
		120	static HV *coro_state_stash, *coro_stash;
		121	static SV *coro_mortal; /* will be freed after next transfer */
		122
		123	static struct coro_cctx *cctx_first;
		124	static int cctx_count, cctx_idle;
		125
		126	/* this is a structure representing a c-level coroutine */
47	typedef struct {	127	typedef struct coro_cctx {
48	int refcnt; /* pointer reference counter */	128	struct coro_cctx *next;
49	int usecnt; /* shared by how many coroutines */
50	int gencnt; /* generation counter */
51		129
52	coro_context cctx;	130	/* the stack */
53
54	void *sptr;	131	void *sptr;
55	long ssize; /* positive == mmap, otherwise malloc */	132	long ssize; /* positive == mmap, otherwise malloc */
56	} coro_stack;
57		133
58	static coro_stack main_stack = { 1, 0, 0 };	134	/* cpu state */
		135	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		136	JMPENV *top_env;
		137	coro_context cctx;
59		138
		139	int inuse;
		140
		141	#if USE_VALGRIND
		142	int valgrind_id;
		143	#endif
		144	} coro_cctx;
		145
		146	enum {
		147	CF_RUNNING = 0x0001, /* coroutine is running */
		148	CF_READY = 0x0002, /* coroutine is ready */
		149	CF_NEW = 0x0004, /* ahs never been switched to */
		150	};
		151
		152	/* this is a structure representing a perl-level coroutine */
60	struct coro {	153	struct coro {
61	/* the optional C context */	154	/* the c coroutine allocated to this perl coroutine, if any */
62	coro_stack *stack;	155	coro_cctx *cctx;
63	void *cursp;
64	int gencnt;
65
66	/* optionally saved, might be zero */
67	AV *defav;
68	SV *defsv;
69	SV *errsv;
70
71	/* saved global state not related to stacks */
72	U8 dowarn;
73
74	/* the stacks and related info (callchain etc..) */
75	PERL_SI *curstackinfo;
76	AV *curstack;
77	AV *mainstack;
78	SV **stack_sp;
79	OP *op;
80	SV **curpad;
81	SV **stack_base;
82	SV **stack_max;
83	SV **tmps_stack;
84	I32 tmps_floor;
85	I32 tmps_ix;
86	I32 tmps_max;
87	I32 *markstack;
88	I32 *markstack_ptr;
89	I32 *markstack_max;
90	I32 *scopestack;
91	I32 scopestack_ix;
92	I32 scopestack_max;
93	ANY *savestack;
94	I32 savestack_ix;
95	I32 savestack_max;
96	OP **retstack;
97	I32 retstack_ix;
98	I32 retstack_max;
99	COP *curcop;
100	JMPENV start_env;
101	JMPENV *top_env;
102		156
103	/* data associated with this coroutine (initial args) */	157	/* data associated with this coroutine (initial args) */
104	AV *args;	158	AV *args;
		159	int refcnt;
		160	int save; /* CORO_SAVE flags */
		161	int flags; /* CF_ flags */
		162
		163	/* optionally saved, might be zero */
		164	AV *defav; /* @_ */
		165	SV *defsv; /* $_ */
		166	SV *errsv; /* $@ */
		167	SV *irssv; /* $/ */
		168	SV *irssv_sv; /* real $/ cache */
		169
		170	#define VAR(name,type) type name;
		171	# include "state.h"
		172	#undef VAR
		173
		174	/* coro process data */
		175	int prio;
105	};	176	};
106		177
107	typedef struct coro *Coro__State;	178	typedef struct coro *Coro__State;
108	typedef struct coro *Coro__State_or_hashref;	179	typedef struct coro *Coro__State_or_hashref;
109		180
110	static AV *main_mainstack; /* used to differentiate between $main and others */	181	static AV *
111	static HV *coro_state_stash;	182	coro_clone_padlist (CV *cv)
112	static SV *ucoro_state_sv;
113	static U32 ucoro_state_hash;
114	static HV *padlist_cache;
115
116	/* mostly copied from op.c:cv_clone2 */
117	STATIC AV *
118	clone_padlist (AV *protopadlist)
119	{	183	{
120	AV *av;	184	AV *padlist = CvPADLIST (cv);
121	I32 ix;
122	AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE);
123	AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE);
124	SV **pname = AvARRAY (protopad_name);
125	SV **ppad = AvARRAY (protopad);
126	I32 fname = AvFILLp (protopad_name);
127	I32 fpad = AvFILLp (protopad);
128	AV *newpadlist, *newpad_name, *newpad;	185	AV *newpadlist, *newpad;
129	SV **npad;
130
131	newpad_name = newAV ();
132	for (ix = fname; ix >= 0; ix--)
133	av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
134
135	newpad = newAV ();
136	av_fill (newpad, AvFILLp (protopad));
137	npad = AvARRAY (newpad);
138		186
139	newpadlist = newAV ();	187	newpadlist = newAV ();
140	AvREAL_off (newpadlist);	188	AvREAL_off (newpadlist);
141	av_store (newpadlist, 0, (SV *) newpad_name);	189	#if PERL_VERSION_ATLEAST (5,9,0)
		190	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		191	#else
		192	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		193	#endif
		194	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		195	--AvFILLp (padlist);
		196
		197	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
142	av_store (newpadlist, 1, (SV *) newpad);	198	av_store (newpadlist, 1, (SV *)newpad);
143		199
144	av = newAV (); /* will be @_ */	200	return newpadlist;
145	av_extend (av, 0);	201	}
146	av_store (newpad, 0, (SV *) av);
147	AvFLAGS (av) = AVf_REIFY;
148		202
149	for (ix = fpad; ix > 0; ix--)	203	static void
		204	free_padlist (AV *padlist)
		205	{
		206	/* may be during global destruction */
		207	if (SvREFCNT (padlist))
150	{	208	{
151	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	209	I32 i = AvFILLp (padlist);
152	if (namesv && namesv != &PL_sv_undef)	210	while (i >= 0)
153	{	211	{
154	char *name = SvPVX (namesv); /* XXX */	212	SV **svp = av_fetch (padlist, i--, FALSE);
155	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	213	if (svp)
156	{ /* lexical from outside? */
157	npad[ix] = SvREFCNT_inc (ppad[ix]);
158	}	214	{
159	else
160	{ /* our own lexical */
161	SV *sv;	215	SV *sv;
162	if (*name == '&')	216	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
163	sv = SvREFCNT_inc (ppad[ix]);	217	SvREFCNT_dec (sv);
164	else if (*name == '@')	218
165	sv = (SV *) newAV ();	219	SvREFCNT_dec (*svp);
166	else if (*name == '%')
167	sv = (SV *) newHV ();
168	else
169	sv = NEWSV (0, 0);
170	if (!SvPADBUSY (sv))
171	SvPADMY_on (sv);
172	npad[ix] = sv;
173	}	220	}
174	}	221	}
175	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	222
176	{	223	SvREFCNT_dec ((SV*)padlist);
177	npad[ix] = SvREFCNT_inc (ppad[ix]);
178	}
179	else
180	{
181	SV *sv = NEWSV (0, 0);
182	SvPADTMP_on (sv);
183	npad[ix] = sv;
184	}
185	}	224	}
		225	}
186		226
187	#if 0 /* return -ENOTUNDERSTOOD */	227	static int
188	/* Now that vars are all in place, clone nested closures. */	228	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		229	{
		230	AV *padlist;
		231	AV *av = (AV *)mg->mg_obj;
189		232
190	for (ix = fpad; ix > 0; ix--) {	233	/* casting is fun. */
191	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	234	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
192	if (namesv	235	free_padlist (padlist);
193	&& namesv != &PL_sv_undef	236
194	&& !(SvFLAGS(namesv) & SVf_FAKE)	237	SvREFCNT_dec (av);
195	&& *SvPVX(namesv) == '&'	238
196	&& CvCLONE(ppad[ix]))	239	return 0;
197	{	240	}
198	CV *kid = cv_clone((CV*)ppad[ix]);	241
199	SvREFCNT_dec(ppad[ix]);	242	#define PERL_MAGIC_coro PERL_MAGIC_ext
200	CvCLONE_on(kid);	243
201	SvPADMY_on(kid);	244	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
202	npad[ix] = (SV*)kid;	245
203	}	246	#define CORO_MAGIC(cv) \
		247	SvMAGIC (cv) \
		248	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		249	? SvMAGIC (cv) \
		250	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		251	: 0
		252
		253	/* the next two functions merely cache the padlists */
		254	static void
		255	get_padlist (CV *cv)
		256	{
		257	MAGIC *mg = CORO_MAGIC (cv);
		258	AV *av;
		259
		260	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		261	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		262	else
		263	{
		264	#if 0
		265	/* this is probably cleaner, but also slower? */
		266	CV *cp = Perl_cv_clone (cv);
		267	CvPADLIST (cv) = CvPADLIST (cp);
		268	CvPADLIST (cp) = 0;
		269	SvREFCNT_dec (cp);
		270	#else
		271	CvPADLIST (cv) = coro_clone_padlist (cv);
		272	#endif
		273	}
		274	}
		275
		276	static void
		277	put_padlist (CV *cv)
		278	{
		279	MAGIC *mg = CORO_MAGIC (cv);
		280	AV *av;
		281
		282	if (!mg)
		283	{
		284	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		285	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		286	mg->mg_virtual = &vtbl_coro;
		287	mg->mg_obj = (SV *)newAV ();
204	}	288	}
205	#endif
206		289
207	return newpadlist;	290	av = (AV *)mg->mg_obj;
208	}
209		291
210	#ifdef MAY_FLUSH	292	if (AvFILLp (av) >= AvMAX (av))
211	STATIC AV *	293	av_extend (av, AvMAX (av) + 1);
212	free_padlist (AV *padlist)
213	{
214	/* may be during global destruction */
215	if (SvREFCNT(padlist))
216	{
217	I32 i = AvFILLp(padlist);
218	while (i >= 0)
219	{
220	SV **svp = av_fetch(padlist, i--, FALSE);
221	SV *sv = svp ? *svp : Nullsv;
222	if (sv)
223	SvREFCNT_dec(sv);
224	}
225		294
226	SvREFCNT_dec((SV*)padlist);	295	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
227	}
228	}	296	}
229	#endif
230
231	/* the next two functions merely cache the padlists */
232	STATIC void
233	get_padlist (CV *cv)
234	{
235	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0);
236
237	if (he && AvFILLp ((AV *)*he) >= 0)
238	CvPADLIST (cv) = (AV *)av_pop ((AV *)*he);
239	else
240	CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
241	}
242
243	STATIC void
244	put_padlist (CV *cv)
245	{
246	SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
247
248	if (SvTYPE (*he) != SVt_PVAV)
249	{
250	SvREFCNT_dec (*he);
251	*he = (SV *)newAV ();
252	}
253
254	av_push ((AV *)*he, (SV *)CvPADLIST (cv));
255	}
256
257	#ifdef MAY_FLUSH
258	STATIC void
259	flush_padlist_cache ()
260	{
261	HV *hv = padlist_cache;
262	padlist_cache = newHV ();
263
264	if (hv_iterinit (hv))
265	{
266	HE *he;
267	AV *padlist;
268
269	while (!!(he = hv_iternext (hv)))
270	{
271	AV *av = (AV *)HeVAL(he);
272
273	/* casting is fun. */
274	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
275	free_padlist (padlist);
276	}
277	}
278
279	SvREFCNT_dec (hv);
280	}
281	#endif
282		297
283	#define SB do {	298	#define SB do {
284	#define SE } while (0)	299	#define SE } while (0)
285		300
286	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE
287	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE
288
289	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	301	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
290		302
291	static void	303	static void
292	load_state(pTHX_ Coro__State c)	304	load_perl (Coro__State c)
293	{	305	{
294	PL_dowarn = c->dowarn;	306	#define VAR(name,type) PL_ ## name = c->name;
295		307	# include "state.h"
296	PL_curstackinfo = c->curstackinfo;	308	#undef VAR
297	PL_curstack = c->curstack;
298	PL_mainstack = c->mainstack;
299	PL_stack_sp = c->stack_sp;
300	PL_op = c->op;
301	PL_curpad = c->curpad;
302	PL_stack_base = c->stack_base;
303	PL_stack_max = c->stack_max;
304	PL_tmps_stack = c->tmps_stack;
305	PL_tmps_floor = c->tmps_floor;
306	PL_tmps_ix = c->tmps_ix;
307	PL_tmps_max = c->tmps_max;
308	PL_markstack = c->markstack;
309	PL_markstack_ptr = c->markstack_ptr;
310	PL_markstack_max = c->markstack_max;
311	PL_scopestack = c->scopestack;
312	PL_scopestack_ix = c->scopestack_ix;
313	PL_scopestack_max = c->scopestack_max;
314	PL_savestack = c->savestack;
315	PL_savestack_ix = c->savestack_ix;
316	PL_savestack_max = c->savestack_max;
317	PL_retstack = c->retstack;
318	PL_retstack_ix = c->retstack_ix;
319	PL_retstack_max = c->retstack_max;
320	PL_curcop = c->curcop;
321	PL_start_env = c->start_env;
322	PL_top_env = c->top_env;
323		309
324	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	310	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
325	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	311	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
326	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	312	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		313	if (c->irssv)
		314	{
		315	if (c->irssv == PL_rs || sv_eq (PL_rs, c->irssv))
		316	SvREFCNT_dec (c->irssv);
		317	else
		318	{
		319	REPLACE_SV (PL_rs, c->irssv);
		320	if (!c->irssv_sv) c->irssv_sv = get_sv ("/", 0);
		321	sv_setsv (c->irssv_sv, PL_rs);
		322	}
		323	}
327		324
328	{	325	{
329	dSP;	326	dSP;
330	CV *cv;	327	CV *cv;
331		328
332	/* now do the ugly restore mess */	329	/* now do the ugly restore mess */
333	while ((cv = (CV *)POPs))	330	while ((cv = (CV *)POPs))
334	{	331	{
335	AV *padlist = (AV *)POPs;
336
337	if (padlist)
338	{
339	put_padlist (cv); /* mark this padlist as available */	332	put_padlist (cv); /* mark this padlist as available */
340	CvPADLIST(cv) = padlist;	333	CvDEPTH (cv) = PTR2IV (POPs);
341	#ifdef USE_THREADS	334	CvPADLIST (cv) = (AV *)POPs;
342	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
343	#endif
344	}
345
346	++CvDEPTH(cv);
347	}	335	}
348		336
349	PUTBACK;	337	PUTBACK;
350	}	338	}
351	}	339	}
352		340
353	static void	341	static void
354	save_state(pTHX_ Coro__State c, int flags)	342	save_perl (Coro__State c)
355	{	343	{
356	{	344	{
357	dSP;	345	dSP;
358	I32 cxix = cxstack_ix;	346	I32 cxix = cxstack_ix;
359	PERL_CONTEXT *ccstk = cxstack;	347	PERL_CONTEXT *ccstk = cxstack;
…		…
362	/*	350	/*
363	* the worst thing you can imagine happens first - we have to save	351	* the worst thing you can imagine happens first - we have to save
364	* (and reinitialize) all cv's in the whole callchain :(	352	* (and reinitialize) all cv's in the whole callchain :(
365	*/	353	*/
366		354
		355	EXTEND (SP, 3 + 1);
367	PUSHs (Nullsv);	356	PUSHs (Nullsv);
368	/* this loop was inspired by pp_caller */	357	/* this loop was inspired by pp_caller */
369	for (;;)	358	for (;;)
370	{	359	{
371	do	360	while (cxix >= 0)
372	{	361	{
373	PERL_CONTEXT *cx = &ccstk[cxix--];	362	PERL_CONTEXT *cx = &ccstk[cxix--];
374		363
375	if (CxTYPE(cx) == CXt_SUB)	364	if (CxTYPE (cx) == CXt_SUB)
376	{	365	{
377	CV *cv = cx->blk_sub.cv;	366	CV *cv = cx->blk_sub.cv;
		367
378	if (CvDEPTH(cv))	368	if (CvDEPTH (cv))
379	{	369	{
380	#ifdef USE_THREADS
381	/*XPUSHs ((SV *)CvOWNER(cv));*/
382	/*CvOWNER(cv) = 0;*/
383	/*error must unlock this cv etc.. etc...*/
384	#endif
385	EXTEND (SP, CvDEPTH(cv)*2);	370	EXTEND (SP, 3);
386
387	while (--CvDEPTH(cv))
388	{
389	/* this tells the restore code to increment CvDEPTH */
390	PUSHs (Nullsv);
391	PUSHs ((SV *)cv);
392	}
393
394	PUSHs ((SV *)CvPADLIST(cv));	371	PUSHs ((SV *)CvPADLIST (cv));
		372	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
395	PUSHs ((SV *)cv);	373	PUSHs ((SV *)cv);
396		374
		375	CvDEPTH (cv) = 0;
397	get_padlist (cv); /* this is a monster */	376	get_padlist (cv);
398	}	377	}
399	}	378	}
400	else if (CxTYPE(cx) == CXt_FORMAT)
401	{
402	/* I never used formats, so how should I know how these are implemented? */
403	/* my bold guess is as a simple, plain sub... */
404	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
405	}
406	}	379	}
407	while (cxix >= 0);
408		380
409	if (top_si->si_type == PERLSI_MAIN)	381	if (top_si->si_type == PERLSI_MAIN)
410	break;	382	break;
411		383
412	top_si = top_si->si_prev;	384	top_si = top_si->si_prev;
…		…
415	}	387	}
416		388
417	PUTBACK;	389	PUTBACK;
418	}	390	}
419		391
420	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	392	c->defav = c->save & CORO_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
421	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	393	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
422	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	394	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		395	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
423		396
424	/* I have not the slightest idea of why av_reify is necessary */	397	#define VAR(name,type)c->name = PL_ ## name;
425	/* but if it's missing the defav contents magically get replaced sometimes */	398	# include "state.h"
426	if (c->defav)	399	#undef VAR
427	av_reify (c->defav);
428
429	c->dowarn = PL_dowarn;
430
431	c->curstackinfo = PL_curstackinfo;
432	c->curstack = PL_curstack;
433	c->mainstack = PL_mainstack;
434	c->stack_sp = PL_stack_sp;
435	c->op = PL_op;
436	c->curpad = PL_curpad;
437	c->stack_base = PL_stack_base;
438	c->stack_max = PL_stack_max;
439	c->tmps_stack = PL_tmps_stack;
440	c->tmps_floor = PL_tmps_floor;
441	c->tmps_ix = PL_tmps_ix;
442	c->tmps_max = PL_tmps_max;
443	c->markstack = PL_markstack;
444	c->markstack_ptr = PL_markstack_ptr;
445	c->markstack_max = PL_markstack_max;
446	c->scopestack = PL_scopestack;
447	c->scopestack_ix = PL_scopestack_ix;
448	c->scopestack_max = PL_scopestack_max;
449	c->savestack = PL_savestack;
450	c->savestack_ix = PL_savestack_ix;
451	c->savestack_max = PL_savestack_max;
452	c->retstack = PL_retstack;
453	c->retstack_ix = PL_retstack_ix;
454	c->retstack_max = PL_retstack_max;
455	c->curcop = PL_curcop;
456	c->start_env = PL_start_env;
457	c->top_env = PL_top_env;
458	}	400	}
459		401
460	/*	402	/*
461	* allocate various perl stacks. This is an exact copy	403	* allocate various perl stacks. This is an exact copy
462	* of perl.c:init_stacks, except that it uses less memory	404	* of perl.c:init_stacks, except that it uses less memory
463	* on the assumption that coroutines do not usually need	405	* on the (sometimes correct) assumption that coroutines do
464	* a lot of stackspace.	406	* not usually need a lot of stackspace.
465	*/	407	*/
466	STATIC void	408	#if USE_PERL_INIT_STACKS
		409	# define coro_init_stacks init_stacks
		410	#else
		411
		412	static void
467	coro_init_stacks (pTHX)	413	coro_init_stacks ()
468	{	414	{
469	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	415	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
470	PL_curstackinfo->si_type = PERLSI_MAIN;	416	PL_curstackinfo->si_type = PERLSI_MAIN;
471	PL_curstack = PL_curstackinfo->si_stack;	417	PL_curstack = PL_curstackinfo->si_stack;
472	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	418	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
473		419
474	PL_stack_base = AvARRAY(PL_curstack);	420	PL_stack_base = AvARRAY(PL_curstack);
475	PL_stack_sp = PL_stack_base;	421	PL_stack_sp = PL_stack_base;
476	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	422	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
477		423
478	New(50,PL_tmps_stack,96,SV*);	424	New(50,PL_tmps_stack,128,SV*);
479	PL_tmps_floor = -1;	425	PL_tmps_floor = -1;
480	PL_tmps_ix = -1;	426	PL_tmps_ix = -1;
481	PL_tmps_max = 96;	427	PL_tmps_max = 128;
482		428
483	New(54,PL_markstack,16,I32);	429	New(54,PL_markstack,32,I32);
484	PL_markstack_ptr = PL_markstack;	430	PL_markstack_ptr = PL_markstack;
485	PL_markstack_max = PL_markstack + 16;	431	PL_markstack_max = PL_markstack + 32;
486		432
		433	#ifdef SET_MARK_OFFSET
487	SET_MARK_OFFSET;	434	SET_MARK_OFFSET;
		435	#endif
488		436
489	New(54,PL_scopestack,16,I32);	437	New(54,PL_scopestack,32,I32);
490	PL_scopestack_ix = 0;	438	PL_scopestack_ix = 0;
491	PL_scopestack_max = 16;	439	PL_scopestack_max = 32;
492		440
493	New(54,PL_savestack,96,ANY);	441	New(54,PL_savestack,64,ANY);
494	PL_savestack_ix = 0;	442	PL_savestack_ix = 0;
495	PL_savestack_max = 96;	443	PL_savestack_max = 64;
496		444
		445	#if !PERL_VERSION_ATLEAST (5,9,0)
497	New(54,PL_retstack,8,OP*);	446	New(54,PL_retstack,16,OP*);
498	PL_retstack_ix = 0;	447	PL_retstack_ix = 0;
499	PL_retstack_max = 8;	448	PL_retstack_max = 16;
		449	#endif
500	}	450	}
501		451
502	/*	452	/*
503	* destroy the stacks, the callchain etc...	453	* destroy the stacks, the callchain etc...
504	* still there is a memleak of 128 bytes...
505	*/	454	*/
506	STATIC void	455	static void
507	destroy_stacks(pTHX)	456	coro_destroy_stacks ()
508	{	457	{
509	/* is this ugly, I ask? */	458	if (!IN_DESTRUCT)
510	while (PL_scopestack_ix)	459	{
511	LEAVE;	460	/* restore all saved variables and stuff */
		461	LEAVE_SCOPE (0);
		462	assert (PL_tmps_floor == -1);
512		463
513	/* sure it is, but more important: is it correct?? :/ */	464	/* free all temporaries */
514	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
515	FREETMPS;	465	FREETMPS;
		466	assert (PL_tmps_ix == -1);
		467
		468	POPSTACK_TO (PL_mainstack);
		469	}
516		470
517	while (PL_curstackinfo->si_next)	471	while (PL_curstackinfo->si_next)
518	PL_curstackinfo = PL_curstackinfo->si_next;	472	PL_curstackinfo = PL_curstackinfo->si_next;
519		473
520	while (PL_curstackinfo)	474	while (PL_curstackinfo)
521	{	475	{
522	PERL_SI *p = PL_curstackinfo->si_prev;	476	PERL_SI *p = PL_curstackinfo->si_prev;
523		477
524	{	478	if (!IN_DESTRUCT)
525	dSP;
526	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
527	PUTBACK; /* possibly superfluous */
528	}
529
530	dounwind(-1);
531
532	SvREFCNT_dec(PL_curstackinfo->si_stack);	479	SvREFCNT_dec (PL_curstackinfo->si_stack);
		480
533	Safefree(PL_curstackinfo->si_cxstack);	481	Safefree (PL_curstackinfo->si_cxstack);
534	Safefree(PL_curstackinfo);	482	Safefree (PL_curstackinfo);
535	PL_curstackinfo = p;	483	PL_curstackinfo = p;
536	}	484	}
537		485
538	Safefree(PL_tmps_stack);	486	Safefree (PL_tmps_stack);
539	Safefree(PL_markstack);	487	Safefree (PL_markstack);
540	Safefree(PL_scopestack);	488	Safefree (PL_scopestack);
541	Safefree(PL_savestack);	489	Safefree (PL_savestack);
		490	#if !PERL_VERSION_ATLEAST (5,9,0)
542	Safefree(PL_retstack);	491	Safefree (PL_retstack);
543	}
544
545	static void
546	allocate_stack (Coro__State ctx, int alloc)
547	{
548	coro_stack *stack;
549
550	New (0, stack, 1, coro_stack);
551
552	stack->refcnt = 1;
553	stack->usecnt = 1;
554	stack->gencnt = ctx->gencnt = 0;
555	if (alloc)
556	{
557	#ifdef HAVE_MMAP
558	stack->ssize = 128 * 1024 * sizeof (long); /* mmap should do allocate-on-write */
559	stack->sptr = mmap (0, stack->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, 0, 0);
560	if (stack->sptr == (void *)-1)
561	#endif	492	#endif
562	{
563	/*FIXME*//*D*//* reasonable stack size! */
564	stack->ssize = -4096 * sizeof (long);
565	New (0, stack->sptr, 4096, long);
566	}
567	}
568	else
569	stack->sptr = 0;
570
571	ctx->stack = stack;
572	}	493	}
573
574	static void
575	deallocate_stack (Coro__State ctx)
576	{
577	coro_stack *stack = ctx->stack;
578
579	ctx->stack = 0;
580
581	if (stack)
582	{
583	if (!--stack->refcnt)
584	{
585	#ifdef HAVE_MMAP
586	if (stack->ssize > 0 && stack->sptr)
587	munmap (stack->sptr, stack->ssize);
588	else
589	#else
590	Safefree (stack->sptr);
591	#endif	494	#endif
592	Safefree (stack);
593	}
594	else if (ctx->gencnt == stack->gencnt)
595	--stack->usecnt;
596	}
597	}
598		495
599	static void	496	static void
600	setup_coro (void *arg)	497	setup_coro (struct coro *coro)
601	{	498	{
602	/*	499	/*
603	* emulate part of the perl startup here.	500	* emulate part of the perl startup here.
604	*/	501	*/
		502
		503	coro_init_stacks ();
		504
		505	PL_curcop = &PL_compiling;
		506	PL_in_eval = EVAL_NULL;
		507	PL_curpm = 0;
		508	PL_localizing = 0;
		509	PL_dirty = 0;
		510	PL_restartop = 0;
		511
		512	{
		513	dSP;
		514	LOGOP myop;
		515
		516	SvREFCNT_dec (GvAV (PL_defgv));
		517	GvAV (PL_defgv) = coro->args; coro->args = 0;
		518
		519	Zero (&myop, 1, LOGOP);
		520	myop.op_next = Nullop;
		521	myop.op_flags = OPf_WANT_VOID;
		522
		523	PUSHMARK (SP);
		524	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		525	PUTBACK;
		526	PL_op = (OP *)&myop;
		527	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		528	SPAGAIN;
		529	}
		530
		531	ENTER; /* necessary e.g. for dounwind */
		532	}
		533
		534	static void
		535	free_coro_mortal ()
		536	{
		537	if (coro_mortal)
		538	{
		539	SvREFCNT_dec (coro_mortal);
		540	coro_mortal = 0;
		541	}
		542	}
		543
		544	/* inject a fake call to Coro::State::_cctx_init into the execution */
		545	static void NOINLINE
		546	prepare_cctx (coro_cctx *cctx)
		547	{
605	dSP;	548	dSP;
606	Coro__State ctx = (Coro__State)arg;	549	LOGOP myop;
607	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
608		550
609	coro_init_stacks (aTHX);	551	Zero (&myop, 1, LOGOP);
610	JMPENV_BOOTSTRAP;	552	myop.op_next = PL_op;
		553	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		554
		555	PUSHMARK (SP);
		556	EXTEND (SP, 2);
		557	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		558	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		559	PUTBACK;
		560	PL_op = (OP *)&myop;
		561	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
611	SPAGAIN;	562	SPAGAIN;
612
613	/*PL_curcop = 0;*/
614	SvREFCNT_dec (GvAV (PL_defgv));
615	GvAV (PL_defgv) = ctx->args;
616
617	if (ctx->stack)
618	{
619	ctx->cursp = 0;
620
621	PUSHMARK(SP);
622	PUTBACK;
623	(void) call_sv (sub_init, G_VOID|G_NOARGS);
624	croak ("FATAL: CCTXT coroutine returned!");
625	}
626	else
627	{
628	UNOP myop;
629
630	PL_op = (OP *)&myop;
631
632	Zero(&myop, 1, UNOP);
633	myop.op_next = Nullop;
634	myop.op_flags = OPf_WANT_VOID;
635
636	PUSHMARK(SP);
637	XPUSHs (sub_init);
638	/*
639	* the next line is slightly wrong, as PL_op->op_next
640	* is actually being executed so we skip the first op.
641	* that doesn't matter, though, since it is only
642	* pp_nextstate and we never return...
643	* ah yes, and I don't care anyways ;)
644	*/
645	PUTBACK;
646	PL_op = pp_entersub();
647	SPAGAIN;
648
649	ENTER; /* necessary e.g. for dounwind */
650	}
651	}	563	}
652		564
653	static void	565	static void
654	continue_coro (void *arg)	566	coro_run (void *arg)
655	{	567	{
		568	/* coro_run is the alternative tail of transfer(), so unlock here. */
		569	UNLOCK;
		570
656	/*	571	/*
657	* this is a _very_ stripped down perl interpreter ;)	572	* this is a _very_ stripped down perl interpreter ;)
658	*/	573	*/
659	Coro__State ctx = (Coro__State)arg;	574	PL_top_env = &PL_start_env;
660		575
661	ctx->cursp = 0;	576	/* inject call to cctx_init */
662	PL_op = PL_op->op_next;	577	prepare_cctx ((coro_cctx *)arg);
663	CALLRUNOPS(aTHX);	578
664	/*NORETURN*/	579	/* somebody will hit me for both perl_run and PL_restartop */
		580	PL_restartop = PL_op;
		581	perl_run (PL_curinterp);
		582
		583	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
665	abort ();	584	abort ();
666	}	585	}
667		586
668	STATIC void	587	static coro_cctx *
		588	cctx_new ()
		589	{
		590	coro_cctx *cctx;
		591
		592	++cctx_count;
		593
		594	Newz (0, cctx, 1, coro_cctx);
		595
		596	#if HAVE_MMAP
		597
		598	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		599	/* mmap supposedly does allocate-on-write for us */
		600	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		601
		602	if (cctx->sptr == (void *)-1)
		603	{
		604	perror ("FATAL: unable to mmap stack for coroutine");
		605	_exit (EXIT_FAILURE);
		606	}
		607
		608	# if STACKGUARD
		609	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		610	# endif
		611
		612	#else
		613
		614	cctx->ssize = STACKSIZE * (long)sizeof (long);
		615	New (0, cctx->sptr, STACKSIZE, long);
		616
		617	if (!cctx->sptr)
		618	{
		619	perror ("FATAL: unable to malloc stack for coroutine");
		620	_exit (EXIT_FAILURE);
		621	}
		622
		623	#endif
		624
		625	#if USE_VALGRIND
		626	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		627	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		628	cctx->ssize + (char *)cctx->sptr
		629	);
		630	#endif
		631
		632	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		633
		634	return cctx;
		635	}
		636
		637	static void
		638	cctx_destroy (coro_cctx *cctx)
		639	{
		640	if (!cctx)
		641	return;
		642
		643	--cctx_count;
		644
		645	#if USE_VALGRIND
		646	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		647	#endif
		648
		649	#if HAVE_MMAP
		650	munmap (cctx->sptr, cctx->ssize);
		651	#else
		652	Safefree (cctx->sptr);
		653	#endif
		654
		655	Safefree (cctx);
		656	}
		657
		658	static coro_cctx *
		659	cctx_get ()
		660	{
		661	coro_cctx *cctx;
		662
		663	if (cctx_first)
		664	{
		665	cctx = cctx_first;
		666	cctx_first = cctx->next;
		667	--cctx_idle;
		668	}
		669	else
		670	{
		671	cctx = cctx_new ();
		672	PL_op = PL_op->op_next;
		673	}
		674
		675	return cctx;
		676	}
		677
		678	static void
		679	cctx_put (coro_cctx *cctx)
		680	{
		681	/* free another cctx if overlimit */
		682	if (cctx_idle >= MAX_IDLE_CCTX)
		683	{
		684	coro_cctx *first = cctx_first;
		685	cctx_first = first->next;
		686	--cctx_idle;
		687
		688	assert (!first->inuse);
		689	cctx_destroy (first);
		690	}
		691
		692	++cctx_idle;
		693	cctx->next = cctx_first;
		694	cctx_first = cctx;
		695	}
		696
		697	/* never call directly, always through the coro_state_transfer global variable */
		698	static void NOINLINE
669	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	699	transfer (struct coro *prev, struct coro *next)
670	{	700	{
671	dSP;
672	dSTACKLEVEL;	701	dSTACKLEVEL;
673		702
		703	/* sometimes transfer is only called to set idle_sp */
		704	if (!next)
		705	{
		706	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
		707	assert (((coro_cctx *)prev)->top_env = PL_top_env); /* just for the side effetc when assert is enabled */
		708	}
674	if (prev != next)	709	else if (prev != next)
675	{	710	{
676	if (next->mainstack)	711	coro_cctx *prev__cctx;
		712
		713	if (prev->flags & CF_NEW)
677	{	714	{
678	SAVE (prev, flags);	715	/* create a new empty context */
679	LOAD (next);	716	Newz (0, prev->cctx, 1, coro_cctx);
680		717	prev->cctx->inuse = 1;
681	/* mark this state as in-use */	718	prev->flags &= ~CF_NEW;
682	next->mainstack = 0;	719	prev->flags |= CF_RUNNING;
683	next->tmps_ix = -2;
684
685	/* stacklevel changed? if yes, grab the stack for us! */
686	if (flags & TRANSFER_SAVE_CCTXT)
687	{
688	if (!prev->stack)
689	allocate_stack (prev, 0);
690	else if (prev->cursp != stacklevel
691	&& prev->stack->usecnt > 1)
692	{
693	prev->gencnt = ++prev->stack->gencnt;
694	prev->stack->usecnt = 1;
695	}
696
697	/* has our stack been invalidated? */
698	if (next->stack && next->stack->gencnt != next->gencnt)
699	{
700	deallocate_stack (next);
701	allocate_stack (next, 1);
702	coro_create (&(next->stack->cctx),
703	continue_coro, (void *)next,
704	next->stack->sptr, labs (next->stack->ssize));
705	}
706
707	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
708	}
709
710	}	720	}
711	else if (next->tmps_ix == -2)	721
712	croak ("tried to transfer to running coroutine");	722	/*TODO: must not croak here */
		723	if (!prev->flags & CF_RUNNING)
		724	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		725
		726	if (next->flags & CF_RUNNING)
		727	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		728
		729	prev->flags &= ~CF_RUNNING;
		730	next->flags |= CF_RUNNING;
		731
		732	LOCK;
		733
		734	if (next->flags & CF_NEW)
		735	{
		736	/* need to start coroutine */
		737	next->flags &= ~CF_NEW;
		738	/* first get rid of the old state */
		739	save_perl (prev);
		740	/* setup coroutine call */
		741	setup_coro (next);
		742	/* need a new stack */
		743	assert (!next->cctx);
		744	}
713	else	745	else
714	{	746	{
715	SAVE (prev, -1); /* first get rid of the old state */	747	/* coroutine already started */
716		748	save_perl (prev);
717	if (flags & TRANSFER_SAVE_CCTXT)	749	load_perl (next);
718	{
719	if (!prev->stack)
720	allocate_stack (prev, 0);
721
722	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
723	{
724	setup_coro (next);
725
726	prev->stack->refcnt++;
727	prev->stack->usecnt++;
728	next->stack = prev->stack;
729	next->gencnt = prev->gencnt;
730	}
731	else
732	{
733	allocate_stack (next, 1);
734	coro_create (&(next->stack->cctx),
735	setup_coro, (void *)next,
736	next->stack->sptr, labs (next->stack->ssize));
737	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
738	}
739	}
740	else
741	setup_coro (next);
742	}	750	}
		751
		752	prev__cctx = prev->cctx;
		753
		754	/* possibly "free" the cctx */
		755	if (prev__cctx->idle_sp == STACKLEVEL)
		756	{
		757	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		758	assert (PL_top_env == prev__cctx->top_env);
		759
		760	prev->cctx = 0;
		761
		762	cctx_put (prev__cctx);
		763	prev__cctx->inuse = 0;
		764	}
		765
		766	if (!next->cctx)
		767	{
		768	next->cctx = cctx_get ();
		769	assert (!next->cctx->inuse);
		770	next->cctx->inuse = 1;
		771	}
		772
		773	if (prev__cctx != next->cctx)
		774	{
		775	prev__cctx->top_env = PL_top_env;
		776	PL_top_env = next->cctx->top_env;
		777	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		778	}
		779
		780	free_coro_mortal ();
		781
		782	UNLOCK;
743	}	783	}
		784	}
744		785
745	next->cursp = stacklevel;	786	struct transfer_args
		787	{
		788	struct coro *prev, *next;
		789	};
		790
		791	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		792
		793	static void
		794	coro_state_destroy (struct coro *coro)
		795	{
		796	if (coro->refcnt--)
		797	return;
		798
		799	if (coro->mainstack && coro->mainstack != main_mainstack)
		800	{
		801	struct coro temp;
		802	Zero (&temp, 1, struct coro);
		803	temp.save = CORO_SAVE_ALL;
		804
		805	if (coro->flags & CF_RUNNING)
		806	croak ("FATAL: tried to destroy currently running coroutine");
		807
		808	save_perl (&temp);
		809	load_perl (coro);
		810
		811	coro_destroy_stacks ();
		812
		813	load_perl (&temp); /* this will get rid of defsv etc.. */
		814
		815	coro->mainstack = 0;
		816	}
		817
		818	cctx_destroy (coro->cctx);
		819	SvREFCNT_dec (coro->args);
		820	Safefree (coro);
		821	}
		822
		823	static int
		824	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		825	{
		826	struct coro *coro = (struct coro *)mg->mg_ptr;
		827	mg->mg_ptr = 0;
		828
		829	coro_state_destroy (coro);
		830
		831	return 0;
		832	}
		833
		834	static int
		835	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		836	{
		837	struct coro *coro = (struct coro *)mg->mg_ptr;
		838
		839	++coro->refcnt;
		840
		841	return 0;
		842	}
		843
		844	static MGVTBL coro_state_vtbl = {
		845	0, 0, 0, 0,
		846	coro_state_clear,
		847	0,
		848	#ifdef MGf_DUP
		849	coro_state_dup,
		850	#else
		851	# define MGf_DUP 0
		852	#endif
		853	};
		854
		855	static struct coro *
		856	SvSTATE (SV *coro)
		857	{
		858	HV *stash;
		859	MAGIC *mg;
		860
		861	if (SvROK (coro))
		862	coro = SvRV (coro);
		863
		864	stash = SvSTASH (coro);
		865	if (stash != coro_stash && stash != coro_state_stash)
		866	{
		867	/* very slow, but rare, check */
		868	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		869	croak ("Coro::State object required");
		870	}
		871
		872	mg = SvMAGIC (coro);
		873	assert (mg->mg_type == PERL_MAGIC_ext);
		874	return (struct coro *)mg->mg_ptr;
		875	}
		876
		877	static void
		878	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		879	{
		880	ta->prev = SvSTATE (prev_sv);
		881	ta->next = SvSTATE (next_sv);
		882	}
		883
		884	static void
		885	api_transfer (SV *prev_sv, SV *next_sv)
		886	{
		887	struct transfer_args ta;
		888
		889	prepare_transfer (&ta, prev_sv, next_sv);
		890	TRANSFER (ta);
		891	}
		892
		893	static int
		894	api_save (SV *coro_sv, int new_save)
		895	{
		896	struct coro *coro = SvSTATE (coro_sv);
		897	int old_save = coro->save;
		898
		899	if (new_save >= 0)
		900	coro->save = new_save;
		901
		902	return old_save;
		903	}
		904
		905	/** Coro ********************************************************************/
		906
		907	#define PRIO_MAX 3
		908	#define PRIO_HIGH 1
		909	#define PRIO_NORMAL 0
		910	#define PRIO_LOW -1
		911	#define PRIO_IDLE -3
		912	#define PRIO_MIN -4
		913
		914	/* for Coro.pm */
		915	static SV *coro_current;
		916	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		917	static int coro_nready;
		918
		919	static void
		920	coro_enq (SV *coro_sv)
		921	{
		922	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		923	coro_nready++;
		924	}
		925
		926	static SV *
		927	coro_deq (int min_prio)
		928	{
		929	int prio = PRIO_MAX - PRIO_MIN;
		930
		931	min_prio -= PRIO_MIN;
		932	if (min_prio < 0)
		933	min_prio = 0;
		934
		935	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		936	if (AvFILLp (coro_ready [prio]) >= 0)
		937	{
		938	coro_nready--;
		939	return av_shift (coro_ready [prio]);
		940	}
		941
		942	return 0;
		943	}
		944
		945	static int
		946	api_ready (SV *coro_sv)
		947	{
		948	struct coro *coro;
		949
		950	if (SvROK (coro_sv))
		951	coro_sv = SvRV (coro_sv);
		952
		953	coro = SvSTATE (coro_sv);
		954
		955	if (coro->flags & CF_READY)
		956	return 0;
		957
		958	#if 0 /* this is actually harmless */
		959	if (coro->flags & CF_RUNNING)
		960	croak ("Coro::ready called on currently running coroutine");
		961	#endif
		962
		963	coro->flags |= CF_READY;
		964
		965	LOCK;
		966	coro_enq (SvREFCNT_inc (coro_sv));
		967	UNLOCK;
		968
		969	return 1;
		970	}
		971
		972	static int
		973	api_is_ready (SV *coro_sv)
		974	{
		975	return !!SvSTATE (coro_sv)->flags & CF_READY;
		976	}
		977
		978	static void
		979	prepare_schedule (struct transfer_args *ta)
		980	{
		981	SV *prev, *next;
		982
		983	for (;;)
		984	{
		985	LOCK;
		986	next = coro_deq (PRIO_MIN);
		987	UNLOCK;
		988
		989	if (next)
		990	break;
		991
		992	{
		993	dSP;
		994
		995	ENTER;
		996	SAVETMPS;
		997
		998	PUSHMARK (SP);
		999	PUTBACK;
		1000	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		1001
		1002	FREETMPS;
		1003	LEAVE;
		1004	}
		1005	}
		1006
		1007	prev = SvRV (coro_current);
		1008	SvRV_set (coro_current, next);
		1009
		1010	/* free this only after the transfer */
		1011	LOCK;
		1012	free_coro_mortal ();
		1013	UNLOCK;
		1014	coro_mortal = prev;
		1015
		1016	assert (!SvROK(prev));//D
		1017	assert (!SvROK(next));//D
		1018
		1019	ta->prev = SvSTATE (prev);
		1020	ta->next = SvSTATE (next);
		1021
		1022	assert (ta->next->flags & CF_READY);
		1023	ta->next->flags &= ~CF_READY;
		1024	}
		1025
		1026	static void
		1027	prepare_cede (struct transfer_args *ta)
		1028	{
		1029	api_ready (coro_current);
		1030
		1031	prepare_schedule (ta);
		1032	}
		1033
		1034	static void
		1035	api_schedule (void)
		1036	{
		1037	struct transfer_args ta;
		1038
		1039	prepare_schedule (&ta);
		1040	TRANSFER (ta);
		1041	}
		1042
		1043	static void
		1044	api_cede (void)
		1045	{
		1046	struct transfer_args ta;
		1047
		1048	prepare_cede (&ta);
		1049	TRANSFER (ta);
746	}	1050	}
747		1051
748	MODULE = Coro::State PACKAGE = Coro::State	1052	MODULE = Coro::State PACKAGE = Coro::State
749		1053
750	PROTOTYPES: ENABLE	1054	PROTOTYPES: DISABLE
751		1055
752	BOOT:	1056	BOOT:
753	{ /* {} necessary for stoopid perl-5.6.x */	1057	{
754	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1058	#ifdef USE_ITHREADS
755	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1059	MUTEX_INIT (&coro_mutex);
		1060	#endif
		1061	BOOT_PAGESIZE;
		1062
756	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1063	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
757		1064
758	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1065	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
759	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1066	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
760	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1067	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1068	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
761	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1069	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
762
763	if (!padlist_cache)
764	padlist_cache = newHV ();
765		1070
766	main_mainstack = PL_mainstack;	1071	main_mainstack = PL_mainstack;
767	}
768		1072
769	Coro::State	1073	coroapi.ver = CORO_API_VERSION;
770	_newprocess(args)	1074	coroapi.transfer = api_transfer;
771	SV * args	1075
772	PROTOTYPE: $	1076	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1077	}
		1078
		1079	SV *
		1080	new (char *klass, ...)
773	CODE:	1081	CODE:
774	Coro__State coro;	1082	{
		1083	struct coro *coro;
		1084	HV *hv;
		1085	int i;
775		1086
776	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
777	croak ("Coro::State::_newprocess expects an arrayref");
778
779	New (0, coro, 1, struct coro);	1087	Newz (0, coro, 1, struct coro);
		1088	coro->args = newAV ();
		1089	coro->save = CORO_SAVE_ALL;
		1090	coro->flags = CF_NEW;
780		1091
781	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1092	hv = newHV ();
782	coro->mainstack = 0; /* actual work is done inside transfer */	1093	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
783	coro->stack = 0;	1094	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
784		1095
785	RETVAL = coro;	1096	for (i = 1; i < items; i++)
		1097	av_push (coro->args, newSVsv (ST (i)));
		1098	}
786	OUTPUT:	1099	OUTPUT:
787	RETVAL	1100	RETVAL
788		1101
		1102	int
		1103	save (SV *coro, int new_save = -1)
		1104	CODE:
		1105	RETVAL = api_save (coro, new_save);
		1106	OUTPUT:
		1107	RETVAL
		1108
789	void	1109	void
790	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1110	_set_stacklevel (...)
791	Coro::State_or_hashref prev	1111	ALIAS:
792	Coro::State_or_hashref next	1112	Coro::State::transfer = 1
793	int flags	1113	Coro::schedule = 2
794	PROTOTYPE: @	1114	Coro::cede = 3
795	CODE:	1115	CODE:
796	transfer (aTHX_ prev, next, flags);	1116	{
		1117	struct transfer_args ta;
		1118
		1119	switch (ix)
		1120	{
		1121	case 0:
		1122	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1123	ta.next = 0;
		1124	break;
		1125
		1126	case 1:
		1127	if (items != 2)
		1128	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1129
		1130	prepare_transfer (&ta, ST (0), ST (1));
		1131	break;
		1132
		1133	case 2:
		1134	prepare_schedule (&ta);
		1135	break;
		1136
		1137	case 3:
		1138	prepare_cede (&ta);
		1139	break;
		1140	}
		1141
		1142	TRANSFER (ta);
		1143	}
797		1144
798	void	1145	void
799	DESTROY(coro)	1146	_clone_state_from (SV *dst, SV *src)
800	Coro::State coro	1147	CODE:
		1148	{
		1149	struct coro *coro_src = SvSTATE (src);
		1150
		1151	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1152
		1153	++coro_src->refcnt;
		1154	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1155	}
		1156
		1157	void
		1158	_exit (code)
		1159	int code
		1160	PROTOTYPE: $
		1161	CODE:
		1162	_exit (code);
		1163
		1164	int
		1165	cctx_count ()
		1166	CODE:
		1167	RETVAL = cctx_count;
		1168	OUTPUT:
		1169	RETVAL
		1170
		1171	int
		1172	cctx_idle ()
		1173	CODE:
		1174	RETVAL = cctx_idle;
		1175	OUTPUT:
		1176	RETVAL
		1177
		1178	MODULE = Coro::State PACKAGE = Coro
		1179
		1180	BOOT:
		1181	{
		1182	int i;
		1183
		1184	coro_stash = gv_stashpv ("Coro", TRUE);
		1185
		1186	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1187	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1188	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1189	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1190	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1191	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1192
		1193	coro_current = get_sv ("Coro::current", FALSE);
		1194	SvREADONLY_on (coro_current);
		1195
		1196	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1197	coro_ready[i] = newAV ();
		1198
		1199	{
		1200	SV *sv = perl_get_sv("Coro::API", 1);
		1201
		1202	coroapi.schedule = api_schedule;
		1203	coroapi.save = api_save;
		1204	coroapi.cede = api_cede;
		1205	coroapi.ready = api_ready;
		1206	coroapi.is_ready = api_is_ready;
		1207	coroapi.nready = &coro_nready;
		1208	coroapi.current = coro_current;
		1209
		1210	GCoroAPI = &coroapi;
		1211	sv_setiv (sv, (IV)&coroapi);
		1212	SvREADONLY_on (sv);
		1213	}
		1214	}
		1215
		1216	void
		1217	_set_current (SV *current)
		1218	PROTOTYPE: $
		1219	CODE:
		1220	SvREFCNT_dec (SvRV (coro_current));
		1221	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1222
		1223	int
		1224	prio (Coro::State coro, int newprio = 0)
		1225	ALIAS:
		1226	nice = 1
801	CODE:	1227	CODE:
		1228	{
		1229	RETVAL = coro->prio;
802		1230
803	if (coro->mainstack && coro->mainstack != main_mainstack)	1231	if (items > 1)
804	{	1232	{
805	struct coro temp;	1233	if (ix)
		1234	newprio += coro->prio;
806		1235
807	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1236	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
808	LOAD(aTHX_ coro);	1237	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
809		1238
810	destroy_stacks (aTHX);	1239	coro->prio = newprio;
811
812	LOAD((&temp)); /* this will get rid of defsv etc.. */
813
814	coro->mainstack = 0;
815	}	1240	}
		1241	}
816		1242
817	deallocate_stack (coro);	1243	SV *
		1244	ready (SV *self)
		1245	PROTOTYPE: $
		1246	CODE:
		1247	RETVAL = boolSV (api_ready (self));
		1248	OUTPUT:
		1249	RETVAL
818		1250
819	Safefree (coro);	1251	SV *
		1252	is_ready (SV *self)
		1253	PROTOTYPE: $
		1254	CODE:
		1255	RETVAL = boolSV (api_is_ready (self));
		1256	OUTPUT:
		1257	RETVAL
		1258
		1259	int
		1260	nready (...)
		1261	PROTOTYPE:
		1262	CODE:
		1263	RETVAL = coro_nready;
		1264	OUTPUT:
		1265	RETVAL
		1266
		1267	MODULE = Coro::State PACKAGE = Coro::AIO
		1268
		1269	SV *
		1270	_get_state ()
		1271	CODE:
		1272	{
		1273	struct io_state *data;
		1274
		1275	RETVAL = newSV (sizeof (struct io_state));
		1276	data = (struct io_state *)SvPVX (RETVAL);
		1277	SvCUR_set (RETVAL, sizeof (struct io_state));
		1278	SvPOK_only (RETVAL);
		1279
		1280	data->errorno = errno;
		1281	data->laststype = PL_laststype;
		1282	data->laststatval = PL_laststatval;
		1283	data->statcache = PL_statcache;
		1284	}
		1285	OUTPUT:
		1286	RETVAL
820		1287
821	void	1288	void
822	flush()	1289	_set_state (char *data_)
		1290	PROTOTYPE: $
823	CODE:	1291	CODE:
824	#ifdef MAY_FLUSH	1292	{
825	flush_padlist_cache ();	1293	struct io_state *data = (void *)data_;
826	#endif
827		1294
828	MODULE = Coro::State PACKAGE = Coro::Cont	1295	errno = data->errorno;
		1296	PL_laststype = data->laststype;
		1297	PL_laststatval = data->laststatval;
		1298	PL_statcache = data->statcache;
		1299	}
829		1300
830	# this is slightly dirty
831
832	void
833	yield(...)
834	PROTOTYPE: @
835	CODE:
836	static SV *returnstk;
837	SV *sv;
838	AV *defav = GvAV (PL_defgv);
839	struct coro *prev, *next;
840
841	if (!returnstk)
842	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
843
844	/* set up @_ -- ugly */
845	av_clear (defav);
846	av_fill (defav, items - 1);
847	while (items--)
848	av_store (defav, items, SvREFCNT_inc (ST(items)));
849
850	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
851	sv = av_pop ((AV *)SvRV (returnstk));
852	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
853	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
854	SvREFCNT_dec (sv);
855
856	transfer(aTHX_ prev, next, 0);
857

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