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Comparing Coro/Coro/State.xs (file contents):
Revision 1.20 by root, Fri Aug 3 12:51:56 2001 UTC vs.
Revision 1.117 by root, Fri Dec 1 19:41:06 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"
6		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
7	#include <signal.h>	43	#include <stdio.h>
		44	#include <errno.h>
		45
		46	#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
		47	# undef STACKGUARD
		48	#endif
		49
		50	#ifndef STACKGUARD
		51	# define STACKGUARD 0
		52	#endif
8		53
9	#ifdef HAVE_MMAP	54	#ifdef HAVE_MMAP
10	# include <unistd.h>	55	# include <unistd.h>
11	# include <sys/mman.h>	56	# include <sys/mman.h>
12	# ifndef MAP_ANON
13	# ifdef MAP_ANONYMOUS	57	# ifndef MAP_ANONYMOUS
14	# define MAP_ANON MAP_ANONYMOUS	58	# ifdef MAP_ANON
		59	# define MAP_ANONYMOUS MAP_ANON
15	# else	60	# else
16	# undef HAVE_MMAP	61	# undef HAVE_MMAP
17	# endif	62	# endif
18	# endif	63	# endif
		64	# include <limits.h>
		65	# ifndef PAGESIZE
		66	# define PAGESIZE pagesize
		67	# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
		68	static long pagesize;
		69	# else
		70	# define BOOT_PAGESIZE (void)0
19	#endif	71	# endif
20
21	#define MAY_FLUSH /* increases codesize */
22
23	/* perl-related */
24	#define TRANSFER_SAVE_DEFAV 0x00000001
25	#define TRANSFER_SAVE_DEFSV 0x00000002
26	#define TRANSFER_SAVE_ERRSV 0x00000004
27	/* c-related */
28	#define TRANSFER_SAVE_CCTXT 0x00000008
29	#ifdef CORO_LAZY_STACK
30	# define TRANSFER_LAZY_STACK 0x00000010
31	#else	72	#else
32	# define TRANSFER_LAZY_STACK 0x00000000	73	# define PAGESIZE 0
		74	# define BOOT_PAGESIZE (void)0
33	#endif	75	#endif
34		76
35	#define TRANSFER_SAVE_ALL (TRANSFER_SAVE_DEFAV|TRANSFER_SAVE_DEFSV \
36	|TRANSFER_SAVE_ERRSV|TRANSFER_SAVE_CCTXT)
37
38	#define SUB_INIT "Coro::State::initialize"
39	#define UCORO_STATE "_coro_state"
40
41	/* The next macro should delcare a variable stacklevel that contains and approximation	77	/* The next macro should declare a variable stacklevel that contains and approximation
42	* to the current C stack pointer. It's property is that it changes with each call	78	* to the current C stack pointer. Its property is that it changes with each call
43	* and should be unique. */	79	* and should be unique. */
		80	#define dSTACKLEVEL int stacklevel
44	#define dSTACKLEVEL void *stacklevel = &stacklevel	81	#define STACKLEVEL ((void *)&stacklevel)
45		82
46	#define labs(l) ((l) >= 0 ? (l) : -(l))	83	#define IN_DESTRUCT (PL_main_cv == Nullcv)
47		84
48	/* this is actually not only the c stack but also c registers etc... */	85	#if __GNUC__ >= 3
		86	# define attribute(x) __attribute__(x)
		87	#else
		88	# define attribute(x)
		89	#endif
		90
		91	#define NOINLINE attribute ((noinline))
		92
		93	#include "CoroAPI.h"
		94
		95	#define TRANSFER_SET_STACKLEVEL 0x8bfbfbfb /* magic cookie */
		96
		97	#ifdef USE_ITHREADS
		98	static perl_mutex coro_mutex;
		99	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		100	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		101	#else
		102	# define LOCK (void)0
		103	# define UNLOCK (void)0
		104	#endif
		105
		106	static struct CoroAPI coroapi;
		107	static AV *main_mainstack; /* used to differentiate between $main and others */
		108	static HV *coro_state_stash, *coro_stash;
		109	static SV *coro_mortal; /* will be freed after next transfer */
		110
		111	static struct coro_cctx *cctx_first;
		112	static int cctx_count, cctx_idle;
		113
		114	/* this is a structure representing a c-level coroutine */
49	typedef struct {	115	typedef struct coro_cctx {
50	int refcnt; /* pointer reference counter */	116	struct coro_cctx *next;
51	int usecnt; /* shared by how many coroutines */
52	int gencnt; /* generation counter */
53		117
54	coro_context cctx;	118	/* the stack */
55
56	void *sptr;	119	void *sptr;
57	long ssize; /* positive == mmap, otherwise malloc */	120	long ssize; /* positive == mmap, otherwise malloc */
58	} coro_stack;
59		121
		122	/* cpu state */
		123	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		124	JMPENV *top_env;
		125	coro_context cctx;
		126
		127	int inuse;
		128
		129	#if USE_VALGRIND
		130	int valgrind_id;
		131	#endif
		132	} coro_cctx;
		133
		134	enum {
		135	CF_RUNNING = 0x0001, /* coroutine is running */
		136	CF_READY = 0x0002, /* coroutine is ready */
		137	CF_NEW = 0x0004, /* ahs never been switched to */
		138	};
		139
		140	/* this is a structure representing a perl-level coroutine */
60	struct coro {	141	struct coro {
61	/* the optional C context */	142	/* the c coroutine allocated to this perl coroutine, if any */
62	coro_stack *stack;	143	coro_cctx *cctx;
63	void *cursp;	144
		145	/* data associated with this coroutine (initial args) */
		146	AV *args;
64	int gencnt;	147	int refcnt;
		148	int flags;
65		149
66	/* optionally saved, might be zero */	150	/* optionally saved, might be zero */
67	AV *defav;	151	AV *defav;
68	SV *defsv;	152	SV *defsv;
69	SV *errsv;	153	SV *errsv;
70		154
71	/* saved global state not related to stacks */	155	#define VAR(name,type) type name;
72	U8 dowarn;	156	# include "state.h"
73	I32 in_eval;	157	#undef VAR
74		158
75	/* the stacks and related info (callchain etc..) */	159	/* coro process data */
76	PERL_SI *curstackinfo;	160	int prio;
77	AV *curstack;
78	AV *mainstack;
79	SV **stack_sp;
80	OP *op;
81	SV **curpad;
82	SV **stack_base;
83	SV **stack_max;
84	SV **tmps_stack;
85	I32 tmps_floor;
86	I32 tmps_ix;
87	I32 tmps_max;
88	I32 *markstack;
89	I32 *markstack_ptr;
90	I32 *markstack_max;
91	I32 *scopestack;
92	I32 scopestack_ix;
93	I32 scopestack_max;
94	ANY *savestack;
95	I32 savestack_ix;
96	I32 savestack_max;
97	OP **retstack;
98	I32 retstack_ix;
99	I32 retstack_max;
100	COP *curcop;
101	JMPENV *top_env;
102
103	/* data associated with this coroutine (initial args) */
104	AV *args;
105	};	161	};
106		162
107	typedef struct coro *Coro__State;	163	typedef struct coro *Coro__State;
108	typedef struct coro *Coro__State_or_hashref;	164	typedef struct coro *Coro__State_or_hashref;
109		165
110	static AV *main_mainstack; /* used to differentiate between $main and others */	166	static AV *
111	static HV *coro_state_stash;	167	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	{	168	{
120	AV *av;	169	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;	170	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		171
139	newpadlist = newAV ();	172	newpadlist = newAV ();
140	AvREAL_off (newpadlist);	173	AvREAL_off (newpadlist);
141	av_store (newpadlist, 0, (SV *) newpad_name);	174	#if PERL_VERSION_ATLEAST (5,9,0)
		175	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		176	#else
		177	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		178	#endif
		179	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		180	--AvFILLp (padlist);
		181
		182	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
142	av_store (newpadlist, 1, (SV *) newpad);	183	av_store (newpadlist, 1, (SV *)newpad);
143		184
144	av = newAV (); /* will be @_ */	185	return newpadlist;
145	av_extend (av, 0);	186	}
146	av_store (newpad, 0, (SV *) av);
147	AvFLAGS (av) = AVf_REIFY;
148		187
149	for (ix = fpad; ix > 0; ix--)	188	static void
		189	free_padlist (AV *padlist)
		190	{
		191	/* may be during global destruction */
		192	if (SvREFCNT (padlist))
150	{	193	{
151	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	194	I32 i = AvFILLp (padlist);
152	if (namesv && namesv != &PL_sv_undef)	195	while (i >= 0)
153	{	196	{
154	char *name = SvPVX (namesv); /* XXX */	197	SV **svp = av_fetch (padlist, i--, FALSE);
155	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	198	if (svp)
156	{ /* lexical from outside? */
157	npad[ix] = SvREFCNT_inc (ppad[ix]);
158	}	199	{
159	else
160	{ /* our own lexical */
161	SV *sv;	200	SV *sv;
162	if (*name == '&')	201	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
163	sv = SvREFCNT_inc (ppad[ix]);	202	SvREFCNT_dec (sv);
164	else if (*name == '@')	203
165	sv = (SV *) newAV ();	204	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	}	205	}
174	}	206	}
175	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	207
176	{	208	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	}	209	}
		210	}
186		211
187	#if 0 /* return -ENOTUNDERSTOOD */	212	static int
188	/* Now that vars are all in place, clone nested closures. */	213	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		214	{
		215	AV *padlist;
		216	AV *av = (AV *)mg->mg_obj;
189		217
190	for (ix = fpad; ix > 0; ix--) {	218	/* casting is fun. */
191	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	219	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
192	if (namesv	220	free_padlist (padlist);
193	&& namesv != &PL_sv_undef	221
194	&& !(SvFLAGS(namesv) & SVf_FAKE)	222	SvREFCNT_dec (av);
195	&& *SvPVX(namesv) == '&'	223
196	&& CvCLONE(ppad[ix]))	224	return 0;
197	{	225	}
198	CV *kid = cv_clone((CV*)ppad[ix]);	226
199	SvREFCNT_dec(ppad[ix]);	227	#define PERL_MAGIC_coro PERL_MAGIC_ext
200	CvCLONE_on(kid);	228
201	SvPADMY_on(kid);	229	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
202	npad[ix] = (SV*)kid;	230
203	}	231	#define CORO_MAGIC(cv) \
		232	SvMAGIC (cv) \
		233	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		234	? SvMAGIC (cv) \
		235	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		236	: 0
		237
		238	/* the next two functions merely cache the padlists */
		239	static void
		240	get_padlist (CV *cv)
		241	{
		242	MAGIC *mg = CORO_MAGIC (cv);
		243	AV *av;
		244
		245	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		246	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		247	else
		248	{
		249	#if 0
		250	/* this is probably cleaner, but also slower? */
		251	CV *cp = Perl_cv_clone (cv);
		252	CvPADLIST (cv) = CvPADLIST (cp);
		253	CvPADLIST (cp) = 0;
		254	SvREFCNT_dec (cp);
		255	#else
		256	CvPADLIST (cv) = coro_clone_padlist (cv);
		257	#endif
		258	}
		259	}
		260
		261	static void
		262	put_padlist (CV *cv)
		263	{
		264	MAGIC *mg = CORO_MAGIC (cv);
		265	AV *av;
		266
		267	if (!mg)
		268	{
		269	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		270	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		271	mg->mg_virtual = &vtbl_coro;
		272	mg->mg_obj = (SV *)newAV ();
204	}	273	}
205	#endif
206		274
207	return newpadlist;	275	av = (AV *)mg->mg_obj;
208	}
209		276
210	#ifdef MAY_FLUSH	277	if (AvFILLp (av) >= AvMAX (av))
211	STATIC AV *	278	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		279
226	SvREFCNT_dec((SV*)padlist);	280	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
227	}
228	}	281	}
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		282
283	#define SB do {	283	#define SB do {
284	#define SE } while (0)	284	#define SE } while (0)
285		285
286	#define LOAD(state) SB load_state(aTHX_ (state)); SPAGAIN; SE	286	#define LOAD(state) load_state ((state))
287	#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ (state),(flags)); SE	287	#define SAVE(state,flags) save_state ((state),(flags))
288		288
289	#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE	289	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
290		290
291	static void	291	static void
292	load_state(pTHX_ Coro__State c)	292	load_state (Coro__State c)
293	{	293	{
294	PL_dowarn = c->dowarn;	294	#define VAR(name,type) PL_ ## name = c->name;
295	PL_in_eval = c->in_eval;	295	# include "state.h"
296		296	#undef VAR
297	PL_curstackinfo = c->curstackinfo;
298	PL_curstack = c->curstack;
299	PL_mainstack = c->mainstack;
300	PL_stack_sp = c->stack_sp;
301	PL_op = c->op;
302	PL_curpad = c->curpad;
303	PL_stack_base = c->stack_base;
304	PL_stack_max = c->stack_max;
305	PL_tmps_stack = c->tmps_stack;
306	PL_tmps_floor = c->tmps_floor;
307	PL_tmps_ix = c->tmps_ix;
308	PL_tmps_max = c->tmps_max;
309	PL_markstack = c->markstack;
310	PL_markstack_ptr = c->markstack_ptr;
311	PL_markstack_max = c->markstack_max;
312	PL_scopestack = c->scopestack;
313	PL_scopestack_ix = c->scopestack_ix;
314	PL_scopestack_max = c->scopestack_max;
315	PL_savestack = c->savestack;
316	PL_savestack_ix = c->savestack_ix;
317	PL_savestack_max = c->savestack_max;
318	PL_retstack = c->retstack;
319	PL_retstack_ix = c->retstack_ix;
320	PL_retstack_max = c->retstack_max;
321	PL_curcop = c->curcop;
322	PL_top_env = c->top_env;
323		297
324	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	298	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
325	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	299	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
326	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	300	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
327		301
…		…
330	CV *cv;	304	CV *cv;
331		305
332	/* now do the ugly restore mess */	306	/* now do the ugly restore mess */
333	while ((cv = (CV *)POPs))	307	while ((cv = (CV *)POPs))
334	{	308	{
335	AV *padlist = (AV *)POPs;
336
337	if (padlist)
338	{
339	put_padlist (cv); /* mark this padlist as available */	309	put_padlist (cv); /* mark this padlist as available */
340	CvPADLIST(cv) = padlist;	310	CvDEPTH (cv) = PTR2IV (POPs);
341	#ifdef USE_THREADS	311	CvPADLIST (cv) = (AV *)POPs;
342	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
343	#endif
344	}
345
346	++CvDEPTH(cv);
347	}	312	}
348		313
349	PUTBACK;	314	PUTBACK;
350	}	315	}
351	}	316	}
352		317
353	static void	318	static void
354	save_state(pTHX_ Coro__State c, int flags)	319	save_state (Coro__State c, int flags)
355	{	320	{
356	{	321	{
357	dSP;	322	dSP;
358	I32 cxix = cxstack_ix;	323	I32 cxix = cxstack_ix;
359	PERL_CONTEXT *ccstk = cxstack;	324	PERL_CONTEXT *ccstk = cxstack;
…		…
366		331
367	PUSHs (Nullsv);	332	PUSHs (Nullsv);
368	/* this loop was inspired by pp_caller */	333	/* this loop was inspired by pp_caller */
369	for (;;)	334	for (;;)
370	{	335	{
371	do	336	while (cxix >= 0)
372	{	337	{
373	PERL_CONTEXT *cx = &ccstk[cxix--];	338	PERL_CONTEXT *cx = &ccstk[cxix--];
374		339
375	if (CxTYPE(cx) == CXt_SUB)	340	if (CxTYPE (cx) == CXt_SUB)
376	{	341	{
377	CV *cv = cx->blk_sub.cv;	342	CV *cv = cx->blk_sub.cv;
		343
378	if (CvDEPTH(cv))	344	if (CvDEPTH (cv))
379	{	345	{
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);	346	EXTEND (SP, 3);
386		347
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));	348	PUSHs ((SV *)CvPADLIST (cv));
		349	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
395	PUSHs ((SV *)cv);	350	PUSHs ((SV *)cv);
396		351
		352	CvDEPTH (cv) = 0;
397	get_padlist (cv); /* this is a monster */	353	get_padlist (cv);
398	}	354	}
399	}	355	}
		356	#ifdef CXt_FORMAT
400	else if (CxTYPE(cx) == CXt_FORMAT)	357	else if (CxTYPE (cx) == CXt_FORMAT)
401	{	358	{
402	/* I never used formats, so how should I know how these are implemented? */	359	/* I never used formats, so how should I know how these are implemented? */
403	/* my bold guess is as a simple, plain sub... */	360	/* my bold guess is as a simple, plain sub... */
404	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	361	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
405	}	362	}
		363	#endif
406	}	364	}
407	while (cxix >= 0);
408		365
409	if (top_si->si_type == PERLSI_MAIN)	366	if (top_si->si_type == PERLSI_MAIN)
410	break;	367	break;
411		368
412	top_si = top_si->si_prev;	369	top_si = top_si->si_prev;
…		…
419		376
420	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	377	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;
421	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;	378	c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
422	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	379	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
423		380
424	/* I have not the slightest idea of why av_reify is necessary */	381	#define VAR(name,type)c->name = PL_ ## name;
425	/* but if it's missing the defav contents magically get replaced sometimes */	382	# include "state.h"
426	if (c->defav)	383	#undef VAR
427	av_reify (c->defav);
428
429	c->dowarn = PL_dowarn;
430	c->in_eval = PL_in_eval;
431
432	c->curstackinfo = PL_curstackinfo;
433	c->curstack = PL_curstack;
434	c->mainstack = PL_mainstack;
435	c->stack_sp = PL_stack_sp;
436	c->op = PL_op;
437	c->curpad = PL_curpad;
438	c->stack_base = PL_stack_base;
439	c->stack_max = PL_stack_max;
440	c->tmps_stack = PL_tmps_stack;
441	c->tmps_floor = PL_tmps_floor;
442	c->tmps_ix = PL_tmps_ix;
443	c->tmps_max = PL_tmps_max;
444	c->markstack = PL_markstack;
445	c->markstack_ptr = PL_markstack_ptr;
446	c->markstack_max = PL_markstack_max;
447	c->scopestack = PL_scopestack;
448	c->scopestack_ix = PL_scopestack_ix;
449	c->scopestack_max = PL_scopestack_max;
450	c->savestack = PL_savestack;
451	c->savestack_ix = PL_savestack_ix;
452	c->savestack_max = PL_savestack_max;
453	c->retstack = PL_retstack;
454	c->retstack_ix = PL_retstack_ix;
455	c->retstack_max = PL_retstack_max;
456	c->curcop = PL_curcop;
457	c->top_env = PL_top_env;
458	}	384	}
459		385
460	/*	386	/*
461	* allocate various perl stacks. This is an exact copy	387	* allocate various perl stacks. This is an exact copy
462	* of perl.c:init_stacks, except that it uses less memory	388	* of perl.c:init_stacks, except that it uses less memory
463	* on the assumption that coroutines do not usually need	389	* on the (sometimes correct) assumption that coroutines do
464	* a lot of stackspace.	390	* not usually need a lot of stackspace.
465	*/	391	*/
466	STATIC void	392	static void
467	coro_init_stacks (pTHX)	393	coro_init_stacks ()
468	{	394	{
469	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	395	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
470	PL_curstackinfo->si_type = PERLSI_MAIN;	396	PL_curstackinfo->si_type = PERLSI_MAIN;
471	PL_curstack = PL_curstackinfo->si_stack;	397	PL_curstack = PL_curstackinfo->si_stack;
472	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	398	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
473		399
474	PL_stack_base = AvARRAY(PL_curstack);	400	PL_stack_base = AvARRAY(PL_curstack);
475	PL_stack_sp = PL_stack_base;	401	PL_stack_sp = PL_stack_base;
476	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	402	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
477		403
478	New(50,PL_tmps_stack,96,SV*);	404	New(50,PL_tmps_stack,128,SV*);
479	PL_tmps_floor = -1;	405	PL_tmps_floor = -1;
480	PL_tmps_ix = -1;	406	PL_tmps_ix = -1;
481	PL_tmps_max = 96;	407	PL_tmps_max = 128;
482		408
483	New(54,PL_markstack,16,I32);	409	New(54,PL_markstack,32,I32);
484	PL_markstack_ptr = PL_markstack;	410	PL_markstack_ptr = PL_markstack;
485	PL_markstack_max = PL_markstack + 16;	411	PL_markstack_max = PL_markstack + 32;
486		412
		413	#ifdef SET_MARK_OFFSET
487	SET_MARK_OFFSET;	414	SET_MARK_OFFSET;
		415	#endif
488		416
489	New(54,PL_scopestack,16,I32);	417	New(54,PL_scopestack,32,I32);
490	PL_scopestack_ix = 0;	418	PL_scopestack_ix = 0;
491	PL_scopestack_max = 16;	419	PL_scopestack_max = 32;
492		420
493	New(54,PL_savestack,96,ANY);	421	New(54,PL_savestack,64,ANY);
494	PL_savestack_ix = 0;	422	PL_savestack_ix = 0;
495	PL_savestack_max = 96;	423	PL_savestack_max = 64;
496		424
		425	#if !PERL_VERSION_ATLEAST (5,9,0)
497	New(54,PL_retstack,8,OP*);	426	New(54,PL_retstack,16,OP*);
498	PL_retstack_ix = 0;	427	PL_retstack_ix = 0;
499	PL_retstack_max = 8;	428	PL_retstack_max = 16;
		429	#endif
500	}	430	}
501		431
502	/*	432	/*
503	* destroy the stacks, the callchain etc...	433	* destroy the stacks, the callchain etc...
504	* still there is a memleak of 128 bytes...
505	*/	434	*/
506	STATIC void	435	static void
507	destroy_stacks(pTHX)	436	coro_destroy_stacks ()
508	{	437	{
		438	if (!IN_DESTRUCT)
		439	{
509	/* is this ugly, I ask? */	440	/* is this ugly, I ask? */
510	while (PL_scopestack_ix)	441	LEAVE_SCOPE (0);
511	LEAVE;
512		442
513	/* sure it is, but more important: is it correct?? :/ */	443	/* sure it is, but more important: is it correct?? :/ */
514	while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */
515	FREETMPS;	444	FREETMPS;
		445
		446	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		447	}
516		448
517	while (PL_curstackinfo->si_next)	449	while (PL_curstackinfo->si_next)
518	PL_curstackinfo = PL_curstackinfo->si_next;	450	PL_curstackinfo = PL_curstackinfo->si_next;
519		451
520	while (PL_curstackinfo)	452	while (PL_curstackinfo)
521	{	453	{
522	PERL_SI *p = PL_curstackinfo->si_prev;	454	PERL_SI *p = PL_curstackinfo->si_prev;
523		455
524	{	456	{ /*D*//*remove*/
525	dSP;	457	dSP;
526	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	458	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
527	PUTBACK; /* possibly superfluous */	459	PUTBACK; /* possibly superfluous */
528	}	460	}
529		461
530	dounwind(-1);	462	if (!IN_DESTRUCT)
531		463	{
		464	dounwind (-1);/*D*//*remove*/
532	SvREFCNT_dec(PL_curstackinfo->si_stack);	465	SvREFCNT_dec (PL_curstackinfo->si_stack);
		466	}
		467
533	Safefree(PL_curstackinfo->si_cxstack);	468	Safefree (PL_curstackinfo->si_cxstack);
534	Safefree(PL_curstackinfo);	469	Safefree (PL_curstackinfo);
535	PL_curstackinfo = p;	470	PL_curstackinfo = p;
536	}	471	}
537		472
538	Safefree(PL_tmps_stack);	473	Safefree (PL_tmps_stack);
539	Safefree(PL_markstack);	474	Safefree (PL_markstack);
540	Safefree(PL_scopestack);	475	Safefree (PL_scopestack);
541	Safefree(PL_savestack);	476	Safefree (PL_savestack);
		477	#if !PERL_VERSION_ATLEAST (5,9,0)
542	Safefree(PL_retstack);	478	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 for us */
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	479	#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	}	480	}
573		481
574	static void	482	static void
575	deallocate_stack (Coro__State ctx)	483	setup_coro (struct coro *coro)
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
592	Safefree (stack);
593	}
594	else if (ctx->gencnt == stack->gencnt)
595	--stack->usecnt;
596	}
597	}
598
599	static void
600	setup_coro (void *arg)
601	{	484	{
602	/*	485	/*
603	* emulate part of the perl startup here.	486	* emulate part of the perl startup here.
604	*/	487	*/
		488
		489	coro_init_stacks ();
		490
		491	PL_curcop = &PL_compiling;
		492	PL_in_eval = EVAL_NULL;
		493	PL_curpm = 0;
		494	PL_localizing = 0;
		495	PL_dirty = 0;
		496	PL_restartop = 0;
		497
		498	{
		499	dSP;
		500	LOGOP myop;
		501
		502	/* I have no idea why this is needed, but it is */
		503	PUSHMARK (SP);
		504
		505	SvREFCNT_dec (GvAV (PL_defgv));
		506	GvAV (PL_defgv) = coro->args; coro->args = 0;
		507
		508	Zero (&myop, 1, LOGOP);
		509	myop.op_next = Nullop;
		510	myop.op_flags = OPf_WANT_VOID;
		511
		512	PL_op = (OP *)&myop;
		513
		514	PUSHMARK (SP);
		515	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		516	PUTBACK;
		517	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		518	SPAGAIN;
		519	}
		520
		521	ENTER; /* necessary e.g. for dounwind */
		522	}
		523
		524	static void
		525	free_coro_mortal ()
		526	{
		527	if (coro_mortal)
		528	{
		529	SvREFCNT_dec (coro_mortal);
		530	coro_mortal = 0;
		531	}
		532	}
		533
		534	static void NOINLINE
		535	prepare_cctx (coro_cctx *cctx)
		536	{
605	dSP;	537	dSP;
606	Coro__State ctx = (Coro__State)arg;	538	LOGOP myop;
607	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
608		539
609	coro_init_stacks (aTHX);	540	Zero (&myop, 1, LOGOP);
610	/*PL_curcop = 0;*/	541	myop.op_next = PL_op;
611	/*PL_in_eval = PL_in_eval;*/ /* inherit */	542	myop.op_flags = OPf_WANT_VOID;
612	SvREFCNT_dec (GvAV (PL_defgv));
613	GvAV (PL_defgv) = ctx->args;
614		543
		544	sv_setiv (get_sv ("Coro::State::_cctx", FALSE), PTR2IV (cctx));
		545
		546	PUSHMARK (SP);
		547	XPUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		548	PUTBACK;
		549	PL_restartop = PL_ppaddr[OP_ENTERSUB](aTHX);
615	SPAGAIN;	550	SPAGAIN;
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|G_EVAL);
624
625	if (SvTRUE (ERRSV))
626	croak (NULL);
627	else
628	croak ("FATAL: CCTXT coroutine returned!");
629	}
630	else
631	{
632	UNOP myop;
633
634	PL_op = (OP *)&myop;
635
636	Zero(&myop, 1, UNOP);
637	myop.op_next = Nullop;
638	myop.op_flags = OPf_WANT_VOID;
639
640	PUSHMARK(SP);
641	XPUSHs (sub_init);
642	/*
643	* the next line is slightly wrong, as PL_op->op_next
644	* is actually being executed so we skip the first op.
645	* that doesn't matter, though, since it is only
646	* pp_nextstate and we never return...
647	* ah yes, and I don't care anyways ;)
648	*/
649	PUTBACK;
650	PL_op = pp_entersub();
651	SPAGAIN;
652
653	ENTER; /* necessary e.g. for dounwind */
654	}
655	}	551	}
656		552
657	static void	553	static void
658	continue_coro (void *arg)	554	coro_run (void *arg)
659	{	555	{
		556	/* coro_run is the alternative epilogue of transfer() */
		557	UNLOCK;
		558
660	/*	559	/*
661	* this is a _very_ stripped down perl interpreter ;)	560	* this is a _very_ stripped down perl interpreter ;)
662	*/	561	*/
663	Coro__State ctx = (Coro__State)arg;	562	PL_top_env = &PL_start_env;
664		563
665	/*FIXME*//* must set up top_env here */	564	/* inject call to cctx_init */
666	ctx->cursp = 0;	565	prepare_cctx ((coro_cctx *)arg);
667	PL_op = PL_op->op_next;
668	CALLRUNOPS(aTHX);
669		566
		567	/* somebody will hit me for both perl_run and PL_restartop */
		568	perl_run (PL_curinterp);
		569
		570	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
670	abort ();	571	abort ();
671	}	572	}
672		573
673	STATIC void	574	static coro_cctx *
		575	cctx_new ()
		576	{
		577	coro_cctx *cctx;
		578
		579	++cctx_count;
		580
		581	New (0, cctx, 1, coro_cctx);
		582
		583	#if HAVE_MMAP
		584
		585	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		586	/* mmap suppsedly does allocate-on-write for us */
		587	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		588
		589	if (cctx->sptr == (void *)-1)
		590	{
		591	perror ("FATAL: unable to mmap stack for coroutine");
		592	_exit (EXIT_FAILURE);
		593	}
		594
		595	# if STACKGUARD
		596	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		597	# endif
		598
		599	#else
		600
		601	cctx->ssize = STACKSIZE * (long)sizeof (long);
		602	New (0, cctx->sptr, STACKSIZE, long);
		603
		604	if (!cctx->sptr)
		605	{
		606	perror ("FATAL: unable to malloc stack for coroutine");
		607	_exit (EXIT_FAILURE);
		608	}
		609
		610	#endif
		611
		612	#if USE_VALGRIND
		613	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		614	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		615	cctx->ssize + (char *)cctx->sptr
		616	);
		617	#endif
		618
		619	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		620
		621	return cctx;
		622	}
		623
		624	static void
		625	cctx_destroy (coro_cctx *cctx)
		626	{
		627	if (!cctx)
		628	return;
		629
		630	--cctx_count;
		631
		632	#if USE_VALGRIND
		633	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		634	#endif
		635
		636	#if HAVE_MMAP
		637	munmap (cctx->sptr, cctx->ssize);
		638	#else
		639	Safefree (cctx->sptr);
		640	#endif
		641
		642	Safefree (cctx);
		643	}
		644
		645	static coro_cctx *
		646	cctx_get ()
		647	{
		648	coro_cctx *cctx;
		649
		650	if (cctx_first)
		651	{
		652	cctx = cctx_first;
		653	cctx_first = cctx->next;
		654	--cctx_idle;
		655	}
		656	else
		657	{
		658	cctx = cctx_new ();
		659	PL_op = PL_op->op_next;
		660	}
		661
		662	return cctx;
		663	}
		664
		665	static void
		666	cctx_put (coro_cctx *cctx)
		667	{
		668	/* free another cctx if overlimit */
		669	if (cctx_idle >= MAX_IDLE_CCTX)
		670	{
		671	coro_cctx *first = cctx_first;
		672	cctx_first = first->next;
		673	--cctx_idle;
		674
		675	assert (!first->inuse);
		676	cctx_destroy (first);
		677	}
		678
		679	++cctx_idle;
		680	cctx->next = cctx_first;
		681	cctx_first = cctx;
		682	}
		683
		684	/* never call directly, always through the coro_state_transfer global variable */
		685	static void NOINLINE
674	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	686	transfer (struct coro *prev, struct coro *next, int flags)
675	{	687	{
676	dSP;
677	dSTACKLEVEL;	688	dSTACKLEVEL;
678		689
		690	/* sometimes transfer is only called to set idle_sp */
		691	if (flags == TRANSFER_SET_STACKLEVEL)
		692	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
679	if (prev != next)	693	else if (prev != next)
680	{	694	{
		695	coro_cctx *prev__cctx;
		696
		697	if (prev->flags & CF_NEW)
		698	{
		699	/* create a new empty context */
		700	Newz (0, prev->cctx, 1, coro_cctx);
		701	prev->cctx->inuse = 1;
		702	prev->flags &= ~CF_NEW;
		703	prev->flags |= CF_RUNNING;
		704	}
		705
		706	/*TODO: must not croak here */
		707	if (!prev->flags & CF_RUNNING)
		708	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		709
		710	if (next->flags & CF_RUNNING)
		711	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		712
		713	prev->flags &= ~CF_RUNNING;
		714	next->flags |= CF_RUNNING;
		715
		716	LOCK;
		717
681	if (next->mainstack)	718	if (next->mainstack)
682	{	719	{
		720	/* coroutine already started */
683	SAVE (prev, flags);	721	SAVE (prev, flags);
684	LOAD (next);	722	LOAD (next);
685
686	/* mark this state as in-use */
687	next->mainstack = 0;
688	next->tmps_ix = -2;
689
690	/* stacklevel changed? if yes, grab the stack for us! */
691	if (flags & TRANSFER_SAVE_CCTXT)
692	{
693	if (!prev->stack)
694	allocate_stack (prev, 0);
695	else if (prev->cursp != stacklevel
696	&& prev->stack->usecnt > 1)
697	{
698	prev->gencnt = ++prev->stack->gencnt;
699	prev->stack->usecnt = 1;
700	}
701
702	/* has our stack been invalidated? */
703	if (next->stack && next->stack->gencnt != next->gencnt)
704	{
705	deallocate_stack (next);
706	allocate_stack (next, 1);
707	coro_create (&(next->stack->cctx),
708	continue_coro, (void *)next,
709	next->stack->sptr, labs (next->stack->ssize));
710	}
711
712	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
713	}
714
715	}	723	}
716	else if (next->tmps_ix == -2)
717	croak ("tried to transfer to running coroutine");
718	else	724	else
719	{	725	{
		726	/* need to start coroutine */
		727	assert (next->flags & CF_NEW);
		728	next->flags &= ~CF_NEW;
720	SAVE (prev, -1); /* first get rid of the old state */	729	/* first get rid of the old state */
721		730	SAVE (prev, -1);
722	if (flags & TRANSFER_SAVE_CCTXT)	731	/* setup coroutine call */
723	{
724	if (!prev->stack)
725	allocate_stack (prev, 0);
726
727	if (prev->stack->sptr && flags & TRANSFER_LAZY_STACK)
728	{
729	setup_coro (next);
730
731	prev->stack->refcnt++;
732	prev->stack->usecnt++;
733	next->stack = prev->stack;
734	next->gencnt = prev->gencnt;
735	}
736	else
737	{
738	allocate_stack (next, 1);
739	coro_create (&(next->stack->cctx),
740	setup_coro, (void *)next,
741	next->stack->sptr, labs (next->stack->ssize));
742	coro_transfer (&(prev->stack->cctx), &(next->stack->cctx));
743	}
744	}
745	else
746	setup_coro (next);	732	setup_coro (next);
		733	/* need a new stack */
		734	assert (!next->stack);
747	}	735	}
		736
		737	prev__cctx = prev->cctx;
		738
		739	/* possibly "free" the cctx */
		740	if (prev__cctx->idle_sp == STACKLEVEL && 0)
		741	{
		742	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		743	assert (PL_top_env == prev__cctx->top_env);
		744
		745	prev->cctx = 0;
		746
		747	cctx_put (prev__cctx);
		748	prev__cctx->inuse = 0;
		749	}
		750
		751	if (!next->cctx)
		752	{
		753	next->cctx = cctx_get ();
		754	assert (!next->cctx->inuse);
		755	next->cctx->inuse = 1;
		756	}
		757
		758	if (prev__cctx != next->cctx)
		759	{
		760	prev__cctx->top_env = PL_top_env;
		761	PL_top_env = next->cctx->top_env;
		762	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		763	}
		764
		765	free_coro_mortal ();
		766
		767	UNLOCK;
748	}	768	}
		769	}
749		770
750	next->cursp = stacklevel;	771	struct transfer_args
		772	{
		773	struct coro *prev, *next;
		774	int flags;
		775	};
		776
		777	#define TRANSFER(ta) transfer ((ta).prev, (ta).next, (ta).flags)
		778
		779	static void
		780	coro_state_destroy (struct coro *coro)
		781	{
		782	if (coro->refcnt--)
		783	return;
		784
		785	if (coro->mainstack && coro->mainstack != main_mainstack)
		786	{
		787	struct coro temp;
		788
		789	if (coro->flags & CF_RUNNING)
		790	croak ("FATAL: tried to destroy currently running coroutine");
		791
		792	SAVE ((&temp), TRANSFER_SAVE_ALL);
		793	LOAD (coro);
		794
		795	coro_destroy_stacks ();
		796
		797	LOAD ((&temp)); /* this will get rid of defsv etc.. */
		798
		799	coro->mainstack = 0;
		800	}
		801
		802	cctx_destroy (coro->cctx);
		803	SvREFCNT_dec (coro->args);
		804	Safefree (coro);
		805	}
		806
		807	static int
		808	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		809	{
		810	struct coro *coro = (struct coro *)mg->mg_ptr;
		811	mg->mg_ptr = 0;
		812
		813	coro_state_destroy (coro);
		814
		815	return 0;
		816	}
		817
		818	static int
		819	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		820	{
		821	struct coro *coro = (struct coro *)mg->mg_ptr;
		822
		823	++coro->refcnt;
		824
		825	return 0;
		826	}
		827
		828	static MGVTBL coro_state_vtbl = {
		829	0, 0, 0, 0,
		830	coro_state_clear,
		831	0,
		832	#ifdef MGf_DUP
		833	coro_state_dup,
		834	#else
		835	# define MGf_DUP 0
		836	#endif
		837	};
		838
		839	static struct coro *
		840	SvSTATE (SV *coro)
		841	{
		842	HV *stash;
		843	MAGIC *mg;
		844
		845	if (SvROK (coro))
		846	coro = SvRV (coro);
		847
		848	stash = SvSTASH (coro);
		849	if (stash != coro_stash && stash != coro_state_stash)
		850	{
		851	/* very slow, but rare, check */
		852	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		853	croak ("Coro::State object required");
		854	}
		855
		856	mg = SvMAGIC (coro);
		857	assert (mg->mg_type == PERL_MAGIC_ext);
		858	return (struct coro *)mg->mg_ptr;
		859	}
		860
		861	static void
		862	prepare_transfer (struct transfer_args *ta, SV *prev, SV *next, int flags)
		863	{
		864	ta->prev = SvSTATE (prev);
		865	ta->next = SvSTATE (next);
		866	ta->flags = flags;
		867	}
		868
		869	static void
		870	api_transfer (SV *prev, SV *next, int flags)
		871	{
		872	struct transfer_args ta;
		873
		874	prepare_transfer (&ta, prev, next, flags);
		875	TRANSFER (ta);
		876	}
		877
		878	/** Coro ********************************************************************/
		879
		880	#define PRIO_MAX 3
		881	#define PRIO_HIGH 1
		882	#define PRIO_NORMAL 0
		883	#define PRIO_LOW -1
		884	#define PRIO_IDLE -3
		885	#define PRIO_MIN -4
		886
		887	/* for Coro.pm */
		888	static SV *coro_current;
		889	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		890	static int coro_nready;
		891
		892	static void
		893	coro_enq (SV *coro_sv)
		894	{
		895	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		896	coro_nready++;
		897	}
		898
		899	static SV *
		900	coro_deq (int min_prio)
		901	{
		902	int prio = PRIO_MAX - PRIO_MIN;
		903
		904	min_prio -= PRIO_MIN;
		905	if (min_prio < 0)
		906	min_prio = 0;
		907
		908	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		909	if (AvFILLp (coro_ready [prio]) >= 0)
		910	{
		911	coro_nready--;
		912	return av_shift (coro_ready [prio]);
		913	}
		914
		915	return 0;
		916	}
		917
		918	static int
		919	api_ready (SV *coro_sv)
		920	{
		921	struct coro *coro;
		922
		923	if (SvROK (coro_sv))
		924	coro_sv = SvRV (coro_sv);
		925
		926	coro = SvSTATE (coro_sv);
		927
		928	if (coro->flags & CF_READY)
		929	return 0;
		930
		931	#if 0 /* this is actually harmless */
		932	if (coro->flags & CF_RUNNING)
		933	croak ("Coro::ready called on currently running coroutine");
		934	#endif
		935
		936	coro->flags |= CF_READY;
		937
		938	LOCK;
		939	coro_enq (SvREFCNT_inc (coro_sv));
		940	UNLOCK;
		941
		942	return 1;
		943	}
		944
		945	static int
		946	api_is_ready (SV *coro_sv)
		947	{
		948	return !!SvSTATE (coro_sv)->flags & CF_READY;
		949	}
		950
		951	static void
		952	prepare_schedule (struct transfer_args *ta)
		953	{
		954	SV *prev, *next;
		955
		956	for (;;)
		957	{
		958	LOCK;
		959	next = coro_deq (PRIO_MIN);
		960	UNLOCK;
		961
		962	if (next)
		963	break;
		964
		965	{
		966	dSP;
		967
		968	ENTER;
		969	SAVETMPS;
		970
		971	PUSHMARK (SP);
		972	PUTBACK;
		973	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		974
		975	FREETMPS;
		976	LEAVE;
		977	}
		978	}
		979
		980	prev = SvRV (coro_current);
		981	SvRV_set (coro_current, next);
		982
		983	/* free this only after the transfer */
		984	LOCK;
		985	free_coro_mortal ();
		986	UNLOCK;
		987	coro_mortal = prev;
		988
		989	assert (!SvROK(prev));//D
		990	assert (!SvROK(next));//D
		991
		992	ta->prev = SvSTATE (prev);
		993	ta->next = SvSTATE (next);
		994	ta->flags = TRANSFER_SAVE_ALL;
		995
		996	assert (ta->flags & CF_READY);
		997	ta->next->flags &= ~CF_READY;
		998	}
		999
		1000	static void
		1001	prepare_cede (struct transfer_args *ta)
		1002	{
		1003	api_ready (coro_current);
		1004
		1005	prepare_schedule (ta);
		1006	}
		1007
		1008	static void
		1009	api_schedule (void)
		1010	{
		1011	struct transfer_args ta;
		1012
		1013	prepare_schedule (&ta);
		1014	TRANSFER (ta);
		1015	}
		1016
		1017	static void
		1018	api_cede (void)
		1019	{
		1020	struct transfer_args ta;
		1021
		1022	prepare_cede (&ta);
		1023	TRANSFER (ta);
751	}	1024	}
752		1025
753	MODULE = Coro::State PACKAGE = Coro::State	1026	MODULE = Coro::State PACKAGE = Coro::State
754		1027
755	PROTOTYPES: ENABLE	1028	PROTOTYPES: DISABLE
756		1029
757	BOOT:	1030	BOOT:
758	{ /* {} necessary for stoopid perl-5.6.x */	1031	{
759	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1032	#ifdef USE_ITHREADS
760	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1033	MUTEX_INIT (&coro_mutex);
		1034	#endif
		1035	BOOT_PAGESIZE;
		1036
761	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1037	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
762		1038
763	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1039	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
764	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1040	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
765	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1041	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
766	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));
767
768	if (!padlist_cache)
769	padlist_cache = newHV ();
770		1042
771	main_mainstack = PL_mainstack;	1043	main_mainstack = PL_mainstack;
772	}
773		1044
774	Coro::State	1045	coroapi.ver = CORO_API_VERSION;
775	_newprocess(args)	1046	coroapi.transfer = api_transfer;
776	SV * args	1047
777	PROTOTYPE: $	1048	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1049	}
		1050
		1051	SV *
		1052	new (char *klass, ...)
778	CODE:	1053	CODE:
779	Coro__State coro;	1054	{
		1055	struct coro *coro;
		1056	HV *hv;
		1057	int i;
780		1058
781	if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
782	croak ("Coro::State::_newprocess expects an arrayref");
783
784	New (0, coro, 1, struct coro);	1059	Newz (0, coro, 1, struct coro);
		1060	coro->args = newAV ();
		1061	coro->flags = CF_NEW;
785		1062
786	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1063	hv = newHV ();
787	coro->mainstack = 0; /* actual work is done inside transfer */	1064	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
788	coro->stack = 0;	1065	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
789		1066
790	RETVAL = coro;	1067	for (i = 1; i < items; i++)
		1068	av_push (coro->args, newSVsv (ST (i)));
		1069	}
791	OUTPUT:	1070	OUTPUT:
792	RETVAL	1071	RETVAL
793		1072
794	void	1073	void
795	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1074	_set_stacklevel (...)
796	Coro::State_or_hashref prev	1075	ALIAS:
797	Coro::State_or_hashref next	1076	Coro::State::transfer = 1
798	int flags	1077	Coro::schedule = 2
799	PROTOTYPE: @	1078	Coro::cede = 3
		1079	Coro::Cont::yield = 4
800	CODE:	1080	CODE:
801	PUTBACK;	1081	{
802	transfer (aTHX_ prev, next, flags);	1082	struct transfer_args ta;
803	SPAGAIN;	1083
		1084	switch (ix)
		1085	{
		1086	case 0:
		1087	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1088	ta.next = 0;
		1089	ta.flags = TRANSFER_SET_STACKLEVEL;
		1090	break;
		1091
		1092	case 1:
		1093	if (items != 3)
		1094	croak ("Coro::State::transfer (prev,next,flags) expects three arguments, not %d", items);
		1095
		1096	prepare_transfer (&ta, ST (0), ST (1), SvIV (ST (2)));
		1097	break;
		1098
		1099	case 2:
		1100	prepare_schedule (&ta);
		1101	break;
		1102
		1103	case 3:
		1104	prepare_cede (&ta);
		1105	break;
		1106
		1107	case 4:
		1108	{
		1109	SV *yieldstack;
		1110	SV *sv;
		1111	AV *defav = GvAV (PL_defgv);
		1112
		1113	yieldstack = *hv_fetch (
		1114	(HV *)SvRV (coro_current),
		1115	"yieldstack", sizeof ("yieldstack") - 1,
		1116	0
		1117	);
		1118
		1119	/* set up @_ -- ugly */
		1120	av_clear (defav);
		1121	av_fill (defav, items - 1);
		1122	while (items--)
		1123	av_store (defav, items, SvREFCNT_inc (ST(items)));
		1124
		1125	sv = av_pop ((AV *)SvRV (yieldstack));
		1126	ta.prev = SvSTATE (*av_fetch ((AV *)SvRV (sv), 0, 0));
		1127	ta.next = SvSTATE (*av_fetch ((AV *)SvRV (sv), 1, 0));
		1128	ta.flags = 0;
		1129	SvREFCNT_dec (sv);
		1130	}
		1131	break;
		1132
		1133	}
		1134
		1135	TRANSFER (ta);
		1136	}
804		1137
805	void	1138	void
806	DESTROY(coro)	1139	_clone_state_from (SV *dst, SV *src)
807	Coro::State coro	1140	CODE:
808	CODE:	1141	{
		1142	struct coro *coro_src = SvSTATE (src);
809		1143
810	if (coro->mainstack && coro->mainstack != main_mainstack)	1144	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
811	{
812	struct coro temp;
813		1145
814	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1146	++coro_src->refcnt;
815	LOAD(aTHX_ coro);	1147	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
816		1148	}
817	destroy_stacks (aTHX);
818
819	LOAD((&temp)); /* this will get rid of defsv etc.. */
820
821	coro->mainstack = 0;
822	}
823
824	deallocate_stack (coro);
825
826	Safefree (coro);
827		1149
828	void	1150	void
829	flush()
830	CODE:
831	#ifdef MAY_FLUSH
832	flush_padlist_cache ();
833	#endif
834
835	void
836	_exit(code)	1151	_exit (code)
837	int code	1152	int code
838	PROTOTYPE: $	1153	PROTOTYPE: $
839	CODE:	1154	CODE:
840	#if defined(__GLIBC__) || _POSIX_C_SOURCE
841	_exit (code);	1155	_exit (code);
842	#else
843	signal (SIGTERM, SIG_DFL);
844	raise (SIGTERM);
845	exit (code);
846	#endif
847		1156
		1157	int
		1158	cctx_count ()
		1159	CODE:
		1160	RETVAL = cctx_count;
		1161	OUTPUT:
		1162	RETVAL
		1163
		1164	int
		1165	cctx_idle ()
		1166	CODE:
		1167	RETVAL = cctx_idle;
		1168	OUTPUT:
		1169	RETVAL
		1170
848	MODULE = Coro::State PACKAGE = Coro::Cont	1171	MODULE = Coro::State PACKAGE = Coro
849		1172
850	# this is slightly dirty	1173	BOOT:
		1174	{
		1175	int i;
		1176
		1177	coro_stash = gv_stashpv ("Coro", TRUE);
		1178
		1179	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1180	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1181	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1182	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1183	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1184	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1185
		1186	coro_current = get_sv ("Coro::current", FALSE);
		1187	SvREADONLY_on (coro_current);
		1188
		1189	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1190	coro_ready[i] = newAV ();
		1191
		1192	{
		1193	SV *sv = perl_get_sv("Coro::API", 1);
		1194
		1195	coroapi.schedule = api_schedule;
		1196	coroapi.cede = api_cede;
		1197	coroapi.ready = api_ready;
		1198	coroapi.is_ready = api_is_ready;
		1199	coroapi.nready = &coro_nready;
		1200	coroapi.current = coro_current;
		1201
		1202	GCoroAPI = &coroapi;
		1203	sv_setiv (sv, (IV)&coroapi);
		1204	SvREADONLY_on (sv);
		1205	}
		1206	}
		1207
		1208	int
		1209	prio (Coro::State coro, int newprio = 0)
		1210	ALIAS:
		1211	nice = 1
		1212	CODE:
		1213	{
		1214	RETVAL = coro->prio;
		1215
		1216	if (items > 1)
		1217	{
		1218	if (ix)
		1219	newprio += coro->prio;
		1220
		1221	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
		1222	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
		1223
		1224	coro->prio = newprio;
		1225	}
		1226	}
		1227
		1228	SV *
		1229	ready (SV *self)
		1230	PROTOTYPE: $
		1231	CODE:
		1232	RETVAL = boolSV (api_ready (self));
		1233	OUTPUT:
		1234	RETVAL
		1235
		1236	SV *
		1237	is_ready (SV *self)
		1238	PROTOTYPE: $
		1239	CODE:
		1240	RETVAL = boolSV (api_is_ready (self));
		1241	OUTPUT:
		1242	RETVAL
		1243
		1244	int
		1245	nready (...)
		1246	PROTOTYPE:
		1247	CODE:
		1248	RETVAL = coro_nready;
		1249	OUTPUT:
		1250	RETVAL
851		1251
852	void	1252	void
853	yield(...)	1253	_set_current (SV *current)
		1254	PROTOTYPE: $
		1255	CODE:
		1256	SvREFCNT_dec (SvRV (coro_current));
		1257	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1258
		1259	MODULE = Coro::State PACKAGE = Coro::AIO
		1260
		1261	SV *
		1262	_get_state ()
		1263	CODE:
		1264	{
		1265	struct {
		1266	int errorno;
		1267	int laststype;
		1268	int laststatval;
		1269	Stat_t statcache;
		1270	} data;
		1271
		1272	data.errorno = errno;
		1273	data.laststype = PL_laststype;
		1274	data.laststatval = PL_laststatval;
		1275	data.statcache = PL_statcache;
		1276
		1277	RETVAL = newSVpvn ((char *)&data, sizeof data);
		1278	}
		1279	OUTPUT:
		1280	RETVAL
		1281
		1282	void
		1283	_set_state (char *data_)
854	PROTOTYPE: @	1284	PROTOTYPE: $
855	CODE:	1285	CODE:
856	static SV *returnstk;	1286	{
857	SV *sv;	1287	struct {
858	AV *defav = GvAV (PL_defgv);	1288	int errorno;
859	struct coro *prev, *next;	1289	int laststype;
		1290	int laststatval;
		1291	Stat_t statcache;
		1292	} *data = (void *)data_;
860		1293
861	if (!returnstk)	1294	errno = data->errorno;
862	returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));	1295	PL_laststype = data->laststype;
863		1296	PL_laststatval = data->laststatval;
864	/* set up @_ -- ugly */	1297	PL_statcache = data->statcache;
865	av_clear (defav);	1298	}
866	av_fill (defav, items - 1);
867	while (items--)
868	av_store (defav, items, SvREFCNT_inc (ST(items)));
869
870	mg_get (returnstk); /* isn't documentation wrong for mg_get? */
871	sv = av_pop ((AV *)SvRV (returnstk));
872	prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
873	next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
874	SvREFCNT_dec (sv);
875
876	transfer(aTHX_ prev, next, 0);
877

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