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Comparing Coro/Coro/State.xs (file contents):
Revision 1.17 by root, Wed Jul 25 14:01:46 2001 UTC vs.
Revision 1.122 by root, Mon Dec 4 13:47:56 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	#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
6		53
7	#ifdef HAVE_MMAP	54	#ifdef HAVE_MMAP
8	# include <unistd.h>	55	# include <unistd.h>
9	# include <sys/mman.h>	56	# include <sys/mman.h>
10	# ifndef MAP_ANON
11	# ifdef MAP_ANONYMOUS	57	# ifndef MAP_ANONYMOUS
12	# define MAP_ANON MAP_ANONYMOUS	58	# ifdef MAP_ANON
		59	# define MAP_ANONYMOUS MAP_ANON
13	# else	60	# else
14	# undef HAVE_MMAP	61	# undef HAVE_MMAP
15	# endif	62	# endif
16	# 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
17	#endif	71	# 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	72	#else
30	# define TRANSFER_LAZY_STACK 0x00000000	73	# define PAGESIZE 0
		74	# define BOOT_PAGESIZE (void)0
31	#endif	75	#endif
32		76
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	77	/* 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	78	* to the current C stack pointer. Its property is that it changes with each call
41	* and should be unique. */	79	* and should be unique. */
		80	#define dSTACKLEVEL int stacklevel
42	#define dSTACKLEVEL void *stacklevel = &stacklevel	81	#define STACKLEVEL ((void *)&stacklevel)
43		82
44	#define labs(l) ((l) >= 0 ? (l) : -(l))	83	#define IN_DESTRUCT (PL_main_cv == Nullcv)
45		84
46	/* 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	#ifdef USE_ITHREADS
		96	static perl_mutex coro_mutex;
		97	# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
		98	# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
		99	#else
		100	# define LOCK (void)0
		101	# define UNLOCK (void)0
		102	#endif
		103
		104	struct io_state
		105	{
		106	int errorno;
		107	I32 laststype;
		108	int laststatval;
		109	Stat_t statcache;
		110	};
		111
		112	static struct CoroAPI coroapi;
		113	static AV *main_mainstack; /* used to differentiate between $main and others */
		114	static HV *coro_state_stash, *coro_stash;
		115	static SV *coro_mortal; /* will be freed after next transfer */
		116
		117	static struct coro_cctx *cctx_first;
		118	static int cctx_count, cctx_idle;
		119
		120	/* this is a structure representing a c-level coroutine */
47	typedef struct {	121	typedef struct coro_cctx {
48	int refcnt; /* pointer reference counter */	122	struct coro_cctx *next;
49	int usecnt; /* shared by how many coroutines */
50	int gencnt; /* generation counter */
51		123
52	coro_context cctx;	124	/* the stack */
53
54	void *sptr;	125	void *sptr;
55	long ssize; /* positive == mmap, otherwise malloc */	126	long ssize; /* positive == mmap, otherwise malloc */
56	} coro_stack;
57		127
58	static coro_stack main_stack = { 1, 0, 0 };	128	/* cpu state */
		129	void *idle_sp; /* sp of top-level transfer/schedule/cede call */
		130	JMPENV *top_env;
		131	coro_context cctx;
59		132
		133	int inuse;
		134
		135	#if USE_VALGRIND
		136	int valgrind_id;
		137	#endif
		138	} coro_cctx;
		139
		140	enum {
		141	CF_RUNNING = 0x0001, /* coroutine is running */
		142	CF_READY = 0x0002, /* coroutine is ready */
		143	CF_NEW = 0x0004, /* ahs never been switched to */
		144	};
		145
		146	/* this is a structure representing a perl-level coroutine */
60	struct coro {	147	struct coro {
61	/* the optional C context */	148	/* the c coroutine allocated to this perl coroutine, if any */
62	coro_stack *stack;	149	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		150
103	/* data associated with this coroutine (initial args) */	151	/* data associated with this coroutine (initial args) */
104	AV *args;	152	AV *args;
		153	int refcnt;
		154	int save; /* CORO_SAVE flags */
		155	int flags; /* CF_ flags */
		156
		157	/* optionally saved, might be zero */
		158	AV *defav; /* @_ */
		159	SV *defsv; /* $_ */
		160	SV *errsv; /* $@ */
		161	SV *irssv; /* $/ */
		162
		163	#define VAR(name,type) type name;
		164	# include "state.h"
		165	#undef VAR
		166
		167	/* coro process data */
		168	int prio;
105	};	169	};
106		170
107	typedef struct coro *Coro__State;	171	typedef struct coro *Coro__State;
108	typedef struct coro *Coro__State_or_hashref;	172	typedef struct coro *Coro__State_or_hashref;
109		173
110	static AV *main_mainstack; /* used to differentiate between $main and others */	174	static AV *
111	static HV *coro_state_stash;	175	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	{	176	{
120	AV *av;	177	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;	178	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		179
139	newpadlist = newAV ();	180	newpadlist = newAV ();
140	AvREAL_off (newpadlist);	181	AvREAL_off (newpadlist);
141	av_store (newpadlist, 0, (SV *) newpad_name);	182	#if PERL_VERSION_ATLEAST (5,9,0)
		183	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
		184	#else
		185	Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
		186	#endif
		187	newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
		188	--AvFILLp (padlist);
		189
		190	av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
142	av_store (newpadlist, 1, (SV *) newpad);	191	av_store (newpadlist, 1, (SV *)newpad);
143		192
144	av = newAV (); /* will be @_ */	193	return newpadlist;
145	av_extend (av, 0);	194	}
146	av_store (newpad, 0, (SV *) av);
147	AvFLAGS (av) = AVf_REIFY;
148		195
149	for (ix = fpad; ix > 0; ix--)	196	static void
		197	free_padlist (AV *padlist)
		198	{
		199	/* may be during global destruction */
		200	if (SvREFCNT (padlist))
150	{	201	{
151	SV *namesv = (ix <= fname) ? pname[ix] : Nullsv;	202	I32 i = AvFILLp (padlist);
152	if (namesv && namesv != &PL_sv_undef)	203	while (i >= 0)
153	{	204	{
154	char *name = SvPVX (namesv); /* XXX */	205	SV **svp = av_fetch (padlist, i--, FALSE);
155	if (SvFLAGS (namesv) & SVf_FAKE || *name == '&')	206	if (svp)
156	{ /* lexical from outside? */
157	npad[ix] = SvREFCNT_inc (ppad[ix]);
158	}	207	{
159	else
160	{ /* our own lexical */
161	SV *sv;	208	SV *sv;
162	if (*name == '&')	209	while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
163	sv = SvREFCNT_inc (ppad[ix]);	210	SvREFCNT_dec (sv);
164	else if (*name == '@')	211
165	sv = (SV *) newAV ();	212	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	}	213	}
174	}	214	}
175	else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))	215
176	{	216	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	}	217	}
		218	}
186		219
187	#if 0 /* return -ENOTUNDERSTOOD */	220	static int
188	/* Now that vars are all in place, clone nested closures. */	221	coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
		222	{
		223	AV *padlist;
		224	AV *av = (AV *)mg->mg_obj;
189		225
190	for (ix = fpad; ix > 0; ix--) {	226	/* casting is fun. */
191	SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;	227	while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
192	if (namesv	228	free_padlist (padlist);
193	&& namesv != &PL_sv_undef	229
194	&& !(SvFLAGS(namesv) & SVf_FAKE)	230	SvREFCNT_dec (av);
195	&& *SvPVX(namesv) == '&'	231
196	&& CvCLONE(ppad[ix]))	232	return 0;
197	{	233	}
198	CV *kid = cv_clone((CV*)ppad[ix]);	234
199	SvREFCNT_dec(ppad[ix]);	235	#define PERL_MAGIC_coro PERL_MAGIC_ext
200	CvCLONE_on(kid);	236
201	SvPADMY_on(kid);	237	static MGVTBL vtbl_coro = {0, 0, 0, 0, coro_cv_free};
202	npad[ix] = (SV*)kid;	238
203	}	239	#define CORO_MAGIC(cv) \
		240	SvMAGIC (cv) \
		241	? SvMAGIC (cv)->mg_type == PERL_MAGIC_coro \
		242	? SvMAGIC (cv) \
		243	: mg_find ((SV *)cv, PERL_MAGIC_coro) \
		244	: 0
		245
		246	/* the next two functions merely cache the padlists */
		247	static void
		248	get_padlist (CV *cv)
		249	{
		250	MAGIC *mg = CORO_MAGIC (cv);
		251	AV *av;
		252
		253	if (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0)
		254	CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
		255	else
		256	{
		257	#if 0
		258	/* this is probably cleaner, but also slower? */
		259	CV *cp = Perl_cv_clone (cv);
		260	CvPADLIST (cv) = CvPADLIST (cp);
		261	CvPADLIST (cp) = 0;
		262	SvREFCNT_dec (cp);
		263	#else
		264	CvPADLIST (cv) = coro_clone_padlist (cv);
		265	#endif
		266	}
		267	}
		268
		269	static void
		270	put_padlist (CV *cv)
		271	{
		272	MAGIC *mg = CORO_MAGIC (cv);
		273	AV *av;
		274
		275	if (!mg)
		276	{
		277	sv_magic ((SV *)cv, 0, PERL_MAGIC_coro, 0, 0);
		278	mg = mg_find ((SV *)cv, PERL_MAGIC_coro);
		279	mg->mg_virtual = &vtbl_coro;
		280	mg->mg_obj = (SV *)newAV ();
204	}	281	}
205	#endif
206		282
207	return newpadlist;	283	av = (AV *)mg->mg_obj;
208	}
209		284
210	#ifdef MAY_FLUSH	285	if (AvFILLp (av) >= AvMAX (av))
211	STATIC AV *	286	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		287
226	SvREFCNT_dec((SV*)padlist);	288	AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
227	}
228	}	289	}
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		290
283	#define SB do {	291	#define SB do {
284	#define SE } while (0)	292	#define SE } while (0)
285		293
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	294	#define REPLACE_SV(sv,val) SB SvREFCNT_dec (sv); (sv) = (val); (val) = 0; SE
290		295
291	static void	296	static void
292	load_state(pTHX_ Coro__State c)	297	load_perl (Coro__State c)
293	{	298	{
294	PL_dowarn = c->dowarn;	299	#define VAR(name,type) PL_ ## name = c->name;
295		300	# include "state.h"
296	PL_curstackinfo = c->curstackinfo;	301	#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		302
324	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);	303	if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav);
325	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);	304	if (c->defsv) REPLACE_SV (DEFSV , c->defsv);
326	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);	305	if (c->errsv) REPLACE_SV (ERRSV , c->errsv);
		306	if (c->irssv) REPLACE_SV (PL_rs , c->irssv);
327		307
328	{	308	{
329	dSP;	309	dSP;
330	CV *cv;	310	CV *cv;
331		311
332	/* now do the ugly restore mess */	312	/* now do the ugly restore mess */
333	while ((cv = (CV *)POPs))	313	while ((cv = (CV *)POPs))
334	{	314	{
335	AV *padlist = (AV *)POPs;
336
337	if (padlist)
338	{
339	put_padlist (cv); /* mark this padlist as available */	315	put_padlist (cv); /* mark this padlist as available */
340	CvPADLIST(cv) = padlist;	316	CvDEPTH (cv) = PTR2IV (POPs);
341	#ifdef USE_THREADS	317	CvPADLIST (cv) = (AV *)POPs;
342	/*CvOWNER(cv) = (struct perl_thread *)POPs;*/
343	#endif
344	}
345
346	++CvDEPTH(cv);
347	}	318	}
348		319
349	PUTBACK;	320	PUTBACK;
350	}	321	}
351	}	322	}
352		323
353	static void	324	static void
354	save_state(pTHX_ Coro__State c, int flags)	325	save_perl (Coro__State c)
355	{	326	{
356	{	327	{
357	dSP;	328	dSP;
358	I32 cxix = cxstack_ix;	329	I32 cxix = cxstack_ix;
359	PERL_CONTEXT *ccstk = cxstack;	330	PERL_CONTEXT *ccstk = cxstack;
…		…
366		337
367	PUSHs (Nullsv);	338	PUSHs (Nullsv);
368	/* this loop was inspired by pp_caller */	339	/* this loop was inspired by pp_caller */
369	for (;;)	340	for (;;)
370	{	341	{
371	do	342	while (cxix >= 0)
372	{	343	{
373	PERL_CONTEXT *cx = &ccstk[cxix--];	344	PERL_CONTEXT *cx = &ccstk[cxix--];
374		345
375	if (CxTYPE(cx) == CXt_SUB)	346	if (CxTYPE (cx) == CXt_SUB)
376	{	347	{
377	CV *cv = cx->blk_sub.cv;	348	CV *cv = cx->blk_sub.cv;
		349
378	if (CvDEPTH(cv))	350	if (CvDEPTH (cv))
379	{	351	{
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);	352	EXTEND (SP, 3);
386		353
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));	354	PUSHs ((SV *)CvPADLIST (cv));
		355	PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
395	PUSHs ((SV *)cv);	356	PUSHs ((SV *)cv);
396		357
		358	CvDEPTH (cv) = 0;
397	get_padlist (cv); /* this is a monster */	359	get_padlist (cv);
398	}	360	}
399	}	361	}
		362	#ifdef CXt_FORMAT
400	else if (CxTYPE(cx) == CXt_FORMAT)	363	else if (CxTYPE (cx) == CXt_FORMAT)
401	{	364	{
402	/* I never used formats, so how should I know how these are implemented? */	365	/* I never used formats, so how should I know how these are implemented? */
403	/* my bold guess is as a simple, plain sub... */	366	/* my bold guess is as a simple, plain sub... */
404	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");	367	croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats");
405	}	368	}
		369	#endif
406	}	370	}
407	while (cxix >= 0);
408		371
409	if (top_si->si_type == PERLSI_MAIN)	372	if (top_si->si_type == PERLSI_MAIN)
410	break;	373	break;
411		374
412	top_si = top_si->si_prev;	375	top_si = top_si->si_prev;
…		…
415	}	378	}
416		379
417	PUTBACK;	380	PUTBACK;
418	}	381	}
419		382
420	c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0;	383	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;	384	c->defsv = c->save & CORO_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
422	c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;	385	c->errsv = c->save & CORO_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
		386	c->irssv = c->save & CORO_SAVE_IRSSV ? SvREFCNT_inc (PL_rs) : 0;
423		387
424	/* I have not the slightest idea of why av_reify is necessary */	388	#define VAR(name,type)c->name = PL_ ## name;
425	/* but if it's missing the defav contents magically get replaced sometimes */	389	# include "state.h"
426	if (c->defav)	390	#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	}	391	}
459		392
460	/*	393	/*
461	* allocate various perl stacks. This is an exact copy	394	* allocate various perl stacks. This is an exact copy
462	* of perl.c:init_stacks, except that it uses less memory	395	* of perl.c:init_stacks, except that it uses less memory
463	* on the assumption that coroutines do not usually need	396	* on the (sometimes correct) assumption that coroutines do
464	* a lot of stackspace.	397	* not usually need a lot of stackspace.
465	*/	398	*/
466	STATIC void	399	static void
467	coro_init_stacks (pTHX)	400	coro_init_stacks ()
468	{	401	{
469	PL_curstackinfo = new_stackinfo(96, 1024/sizeof(PERL_CONTEXT) - 1);	402	PL_curstackinfo = new_stackinfo(128, 1024/sizeof(PERL_CONTEXT));
470	PL_curstackinfo->si_type = PERLSI_MAIN;	403	PL_curstackinfo->si_type = PERLSI_MAIN;
471	PL_curstack = PL_curstackinfo->si_stack;	404	PL_curstack = PL_curstackinfo->si_stack;
472	PL_mainstack = PL_curstack; /* remember in case we switch stacks */	405	PL_mainstack = PL_curstack; /* remember in case we switch stacks */
473		406
474	PL_stack_base = AvARRAY(PL_curstack);	407	PL_stack_base = AvARRAY(PL_curstack);
475	PL_stack_sp = PL_stack_base;	408	PL_stack_sp = PL_stack_base;
476	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);	409	PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
477		410
478	New(50,PL_tmps_stack,96,SV*);	411	New(50,PL_tmps_stack,128,SV*);
479	PL_tmps_floor = -1;	412	PL_tmps_floor = -1;
480	PL_tmps_ix = -1;	413	PL_tmps_ix = -1;
481	PL_tmps_max = 96;	414	PL_tmps_max = 128;
482		415
483	New(54,PL_markstack,16,I32);	416	New(54,PL_markstack,32,I32);
484	PL_markstack_ptr = PL_markstack;	417	PL_markstack_ptr = PL_markstack;
485	PL_markstack_max = PL_markstack + 16;	418	PL_markstack_max = PL_markstack + 32;
486		419
		420	#ifdef SET_MARK_OFFSET
487	SET_MARK_OFFSET;	421	SET_MARK_OFFSET;
		422	#endif
488		423
489	New(54,PL_scopestack,16,I32);	424	New(54,PL_scopestack,32,I32);
490	PL_scopestack_ix = 0;	425	PL_scopestack_ix = 0;
491	PL_scopestack_max = 16;	426	PL_scopestack_max = 32;
492		427
493	New(54,PL_savestack,96,ANY);	428	New(54,PL_savestack,64,ANY);
494	PL_savestack_ix = 0;	429	PL_savestack_ix = 0;
495	PL_savestack_max = 96;	430	PL_savestack_max = 64;
496		431
		432	#if !PERL_VERSION_ATLEAST (5,9,0)
497	New(54,PL_retstack,8,OP*);	433	New(54,PL_retstack,16,OP*);
498	PL_retstack_ix = 0;	434	PL_retstack_ix = 0;
499	PL_retstack_max = 8;	435	PL_retstack_max = 16;
		436	#endif
500	}	437	}
501		438
502	/*	439	/*
503	* destroy the stacks, the callchain etc...	440	* destroy the stacks, the callchain etc...
504	* still there is a memleak of 128 bytes...
505	*/	441	*/
506	STATIC void	442	static void
507	destroy_stacks(pTHX)	443	coro_destroy_stacks ()
508	{	444	{
		445	if (!IN_DESTRUCT)
		446	{
509	/* is this ugly, I ask? */	447	/* is this ugly, I ask? */
510	while (PL_scopestack_ix)	448	LEAVE_SCOPE (0);
511	LEAVE;
512		449
513	/* sure it is, but more important: is it correct?? :/ */	450	/* 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;	451	FREETMPS;
		452
		453	/*POPSTACK_TO (PL_mainstack);*//*D*//*use*/
		454	}
516		455
517	while (PL_curstackinfo->si_next)	456	while (PL_curstackinfo->si_next)
518	PL_curstackinfo = PL_curstackinfo->si_next;	457	PL_curstackinfo = PL_curstackinfo->si_next;
519		458
520	while (PL_curstackinfo)	459	while (PL_curstackinfo)
521	{	460	{
522	PERL_SI *p = PL_curstackinfo->si_prev;	461	PERL_SI *p = PL_curstackinfo->si_prev;
523		462
524	{	463	{ /*D*//*remove*/
525	dSP;	464	dSP;
526	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);	465	SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack);
527	PUTBACK; /* possibly superfluous */	466	PUTBACK; /* possibly superfluous */
528	}	467	}
529		468
530	dounwind(-1);	469	if (!IN_DESTRUCT)
531		470	{
		471	dounwind (-1);/*D*//*remove*/
532	SvREFCNT_dec(PL_curstackinfo->si_stack);	472	SvREFCNT_dec (PL_curstackinfo->si_stack);
		473	}
		474
533	Safefree(PL_curstackinfo->si_cxstack);	475	Safefree (PL_curstackinfo->si_cxstack);
534	Safefree(PL_curstackinfo);	476	Safefree (PL_curstackinfo);
535	PL_curstackinfo = p;	477	PL_curstackinfo = p;
536	}	478	}
537		479
538	Safefree(PL_tmps_stack);	480	Safefree (PL_tmps_stack);
539	Safefree(PL_markstack);	481	Safefree (PL_markstack);
540	Safefree(PL_scopestack);	482	Safefree (PL_scopestack);
541	Safefree(PL_savestack);	483	Safefree (PL_savestack);
		484	#if !PERL_VERSION_ATLEAST (5,9,0)
542	Safefree(PL_retstack);	485	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	486	#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	}	487	}
573		488
574	static void	489	static void
575	deallocate_stack (Coro__State ctx)	490	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	{	491	{
602	/*	492	/*
603	* emulate part of the perl startup here.	493	* emulate part of the perl startup here.
604	*/	494	*/
		495
		496	coro_init_stacks ();
		497
		498	PL_curcop = &PL_compiling;
		499	PL_in_eval = EVAL_NULL;
		500	PL_curpm = 0;
		501	PL_localizing = 0;
		502	PL_dirty = 0;
		503	PL_restartop = 0;
		504
		505	{
		506	dSP;
		507	LOGOP myop;
		508
		509	SvREFCNT_dec (GvAV (PL_defgv));
		510	GvAV (PL_defgv) = coro->args; coro->args = 0;
		511
		512	Zero (&myop, 1, LOGOP);
		513	myop.op_next = Nullop;
		514	myop.op_flags = OPf_WANT_VOID;
		515
		516	PUSHMARK (SP);
		517	XPUSHs ((SV *)get_cv ("Coro::State::_coro_init", FALSE));
		518	PUTBACK;
		519	PL_op = (OP *)&myop;
		520	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
		521	SPAGAIN;
		522	}
		523
		524	ENTER; /* necessary e.g. for dounwind */
		525	}
		526
		527	static void
		528	free_coro_mortal ()
		529	{
		530	if (coro_mortal)
		531	{
		532	SvREFCNT_dec (coro_mortal);
		533	coro_mortal = 0;
		534	}
		535	}
		536
		537	/* inject a fake call to Coro::State::_cctx_init into the execution */
		538	static void NOINLINE
		539	prepare_cctx (coro_cctx *cctx)
		540	{
605	dSP;	541	dSP;
606	Coro__State ctx = (Coro__State)arg;	542	LOGOP myop;
607	SV *sub_init = (SV*)get_cv(SUB_INIT, FALSE);
608		543
609	coro_init_stacks (aTHX);	544	Zero (&myop, 1, LOGOP);
610	JMPENV_BOOTSTRAP;	545	myop.op_next = PL_op;
		546	myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
		547
		548	PUSHMARK (SP);
		549	EXTEND (SP, 2);
		550	PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
		551	PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
		552	PUTBACK;
		553	PL_op = (OP *)&myop;
		554	PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
611	SPAGAIN;	555	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	}	556	}
652		557
653	static void	558	static void
654	continue_coro (void *arg)	559	coro_run (void *arg)
655	{	560	{
		561	/* coro_run is the alternative tail of transfer(), so unlock here. */
		562	UNLOCK;
		563
656	/*	564	/*
657	* this is a _very_ stripped down perl interpreter ;)	565	* this is a _very_ stripped down perl interpreter ;)
658	*/	566	*/
659	Coro__State ctx = (Coro__State)arg;	567	PL_top_env = &PL_start_env;
660		568
661	ctx->cursp = 0;	569	/* inject call to cctx_init */
662	PL_op = PL_op->op_next;	570	prepare_cctx ((coro_cctx *)arg);
663	CALLRUNOPS(aTHX);	571
664	/*NORETURN*/	572	/* somebody will hit me for both perl_run and PL_restartop */
		573	PL_restartop = PL_op;
		574	perl_run (PL_curinterp);
		575
		576	fputs ("FATAL: C coroutine fell over the edge of the world, aborting. Did you call exit in a coroutine?\n", stderr);
665	abort ();	577	abort ();
666	}	578	}
667		579
668	STATIC void	580	static coro_cctx *
		581	cctx_new ()
		582	{
		583	coro_cctx *cctx;
		584
		585	++cctx_count;
		586
		587	New (0, cctx, 1, coro_cctx);
		588
		589	#if HAVE_MMAP
		590
		591	cctx->ssize = ((STACKSIZE * sizeof (long) + PAGESIZE - 1) / PAGESIZE + STACKGUARD) * PAGESIZE;
		592	/* mmap supposedly does allocate-on-write for us */
		593	cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
		594
		595	if (cctx->sptr == (void *)-1)
		596	{
		597	perror ("FATAL: unable to mmap stack for coroutine");
		598	_exit (EXIT_FAILURE);
		599	}
		600
		601	# if STACKGUARD
		602	mprotect (cctx->sptr, STACKGUARD * PAGESIZE, PROT_NONE);
		603	# endif
		604
		605	#else
		606
		607	cctx->ssize = STACKSIZE * (long)sizeof (long);
		608	New (0, cctx->sptr, STACKSIZE, long);
		609
		610	if (!cctx->sptr)
		611	{
		612	perror ("FATAL: unable to malloc stack for coroutine");
		613	_exit (EXIT_FAILURE);
		614	}
		615
		616	#endif
		617
		618	#if USE_VALGRIND
		619	cctx->valgrind_id = VALGRIND_STACK_REGISTER (
		620	STACKGUARD * PAGESIZE + (char *)cctx->sptr,
		621	cctx->ssize + (char *)cctx->sptr
		622	);
		623	#endif
		624
		625	coro_create (&cctx->cctx, coro_run, (void *)cctx, cctx->sptr, cctx->ssize);
		626
		627	return cctx;
		628	}
		629
		630	static void
		631	cctx_destroy (coro_cctx *cctx)
		632	{
		633	if (!cctx)
		634	return;
		635
		636	--cctx_count;
		637
		638	#if USE_VALGRIND
		639	VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
		640	#endif
		641
		642	#if HAVE_MMAP
		643	munmap (cctx->sptr, cctx->ssize);
		644	#else
		645	Safefree (cctx->sptr);
		646	#endif
		647
		648	Safefree (cctx);
		649	}
		650
		651	static coro_cctx *
		652	cctx_get ()
		653	{
		654	coro_cctx *cctx;
		655
		656	if (cctx_first)
		657	{
		658	cctx = cctx_first;
		659	cctx_first = cctx->next;
		660	--cctx_idle;
		661	}
		662	else
		663	{
		664	cctx = cctx_new ();
		665	PL_op = PL_op->op_next;
		666	}
		667
		668	return cctx;
		669	}
		670
		671	static void
		672	cctx_put (coro_cctx *cctx)
		673	{
		674	/* free another cctx if overlimit */
		675	if (cctx_idle >= MAX_IDLE_CCTX)
		676	{
		677	coro_cctx *first = cctx_first;
		678	cctx_first = first->next;
		679	--cctx_idle;
		680
		681	assert (!first->inuse);
		682	cctx_destroy (first);
		683	}
		684
		685	++cctx_idle;
		686	cctx->next = cctx_first;
		687	cctx_first = cctx;
		688	}
		689
		690	/* never call directly, always through the coro_state_transfer global variable */
		691	static void NOINLINE
669	transfer(pTHX_ struct coro *prev, struct coro *next, int flags)	692	transfer (struct coro *prev, struct coro *next)
670	{	693	{
671	dSP;
672	dSTACKLEVEL;	694	dSTACKLEVEL;
673		695
		696	/* sometimes transfer is only called to set idle_sp */
		697	if (!next)
		698	((coro_cctx *)prev)->idle_sp = STACKLEVEL;
674	if (prev != next)	699	else if (prev != next)
675	{	700	{
676	if (next->mainstack)	701	coro_cctx *prev__cctx;
		702
		703	if (prev->flags & CF_NEW)
677	{	704	{
678	SAVE (prev, flags);	705	/* create a new empty context */
679	LOAD (next);	706	Newz (0, prev->cctx, 1, coro_cctx);
680		707	prev->cctx->inuse = 1;
681	/* mark this state as in-use */	708	prev->flags &= ~CF_NEW;
682	next->mainstack = 0;	709	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	}	710	}
711	else if (next->tmps_ix == -2)	711
712	croak ("tried to transfer to running coroutine");	712	/*TODO: must not croak here */
		713	if (!prev->flags & CF_RUNNING)
		714	croak ("Coro::State::transfer called with non-running prev Coro::State, but can only transfer from running states");
		715
		716	if (next->flags & CF_RUNNING)
		717	croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
		718
		719	prev->flags &= ~CF_RUNNING;
		720	next->flags |= CF_RUNNING;
		721
		722	LOCK;
		723
		724	if (next->flags & CF_NEW)
		725	{
		726	/* need to start coroutine */
		727	next->flags &= ~CF_NEW;
		728	/* first get rid of the old state */
		729	save_perl (prev);
		730	/* setup coroutine call */
		731	setup_coro (next);
		732	/* need a new stack */
		733	assert (!next->stack);
		734	}
713	else	735	else
714	{	736	{
715	SAVE (prev, -1); /* first get rid of the old state */	737	/* coroutine already started */
716		738	save_perl (prev);
717	if (flags & TRANSFER_SAVE_CCTXT)	739	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	}	740	}
		741
		742	prev__cctx = prev->cctx;
		743
		744	/* possibly "free" the cctx */
		745	if (prev__cctx->idle_sp == STACKLEVEL)
		746	{
		747	/* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
		748	assert (PL_top_env == prev__cctx->top_env);
		749
		750	prev->cctx = 0;
		751
		752	cctx_put (prev__cctx);
		753	prev__cctx->inuse = 0;
		754	}
		755
		756	if (!next->cctx)
		757	{
		758	next->cctx = cctx_get ();
		759	assert (!next->cctx->inuse);
		760	next->cctx->inuse = 1;
		761	}
		762
		763	if (prev__cctx != next->cctx)
		764	{
		765	prev__cctx->top_env = PL_top_env;
		766	PL_top_env = next->cctx->top_env;
		767	coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
		768	}
		769
		770	free_coro_mortal ();
		771
		772	UNLOCK;
743	}	773	}
		774	}
744		775
745	next->cursp = stacklevel;	776	struct transfer_args
		777	{
		778	struct coro *prev, *next;
		779	};
		780
		781	#define TRANSFER(ta) transfer ((ta).prev, (ta).next)
		782
		783	static void
		784	coro_state_destroy (struct coro *coro)
		785	{
		786	if (coro->refcnt--)
		787	return;
		788
		789	if (coro->mainstack && coro->mainstack != main_mainstack)
		790	{
		791	struct coro temp;
		792	Zero (&temp, 1, struct coro);
		793	temp.save = CORO_SAVE_ALL;
		794
		795	if (coro->flags & CF_RUNNING)
		796	croak ("FATAL: tried to destroy currently running coroutine");
		797
		798	save_perl (&temp);
		799	load_perl (coro);
		800
		801	coro_destroy_stacks ();
		802
		803	load_perl (&temp); /* this will get rid of defsv etc.. */
		804
		805	coro->mainstack = 0;
		806	}
		807
		808	cctx_destroy (coro->cctx);
		809	SvREFCNT_dec (coro->args);
		810	Safefree (coro);
		811	}
		812
		813	static int
		814	coro_state_clear (pTHX_ SV *sv, MAGIC *mg)
		815	{
		816	struct coro *coro = (struct coro *)mg->mg_ptr;
		817	mg->mg_ptr = 0;
		818
		819	coro_state_destroy (coro);
		820
		821	return 0;
		822	}
		823
		824	static int
		825	coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
		826	{
		827	struct coro *coro = (struct coro *)mg->mg_ptr;
		828
		829	++coro->refcnt;
		830
		831	return 0;
		832	}
		833
		834	static MGVTBL coro_state_vtbl = {
		835	0, 0, 0, 0,
		836	coro_state_clear,
		837	0,
		838	#ifdef MGf_DUP
		839	coro_state_dup,
		840	#else
		841	# define MGf_DUP 0
		842	#endif
		843	};
		844
		845	static struct coro *
		846	SvSTATE (SV *coro)
		847	{
		848	HV *stash;
		849	MAGIC *mg;
		850
		851	if (SvROK (coro))
		852	coro = SvRV (coro);
		853
		854	stash = SvSTASH (coro);
		855	if (stash != coro_stash && stash != coro_state_stash)
		856	{
		857	/* very slow, but rare, check */
		858	if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
		859	croak ("Coro::State object required");
		860	}
		861
		862	mg = SvMAGIC (coro);
		863	assert (mg->mg_type == PERL_MAGIC_ext);
		864	return (struct coro *)mg->mg_ptr;
		865	}
		866
		867	static void
		868	prepare_transfer (struct transfer_args *ta, SV *prev_sv, SV *next_sv)
		869	{
		870	ta->prev = SvSTATE (prev_sv);
		871	ta->next = SvSTATE (next_sv);
		872	}
		873
		874	static void
		875	api_transfer (SV *prev_sv, SV *next_sv)
		876	{
		877	struct transfer_args ta;
		878
		879	prepare_transfer (&ta, prev_sv, next_sv);
		880	TRANSFER (ta);
		881	}
		882
		883	static int
		884	api_save (SV *coro_sv, int new_save)
		885	{
		886	struct coro *coro = SvSTATE (coro_sv);
		887	int old_save = coro->save;
		888
		889	if (new_save >= 0)
		890	coro->save = new_save;
		891
		892	return old_save;
		893	}
		894
		895	/** Coro ********************************************************************/
		896
		897	#define PRIO_MAX 3
		898	#define PRIO_HIGH 1
		899	#define PRIO_NORMAL 0
		900	#define PRIO_LOW -1
		901	#define PRIO_IDLE -3
		902	#define PRIO_MIN -4
		903
		904	/* for Coro.pm */
		905	static SV *coro_current;
		906	static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
		907	static int coro_nready;
		908
		909	static void
		910	coro_enq (SV *coro_sv)
		911	{
		912	av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
		913	coro_nready++;
		914	}
		915
		916	static SV *
		917	coro_deq (int min_prio)
		918	{
		919	int prio = PRIO_MAX - PRIO_MIN;
		920
		921	min_prio -= PRIO_MIN;
		922	if (min_prio < 0)
		923	min_prio = 0;
		924
		925	for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= min_prio; )
		926	if (AvFILLp (coro_ready [prio]) >= 0)
		927	{
		928	coro_nready--;
		929	return av_shift (coro_ready [prio]);
		930	}
		931
		932	return 0;
		933	}
		934
		935	static int
		936	api_ready (SV *coro_sv)
		937	{
		938	struct coro *coro;
		939
		940	if (SvROK (coro_sv))
		941	coro_sv = SvRV (coro_sv);
		942
		943	coro = SvSTATE (coro_sv);
		944
		945	if (coro->flags & CF_READY)
		946	return 0;
		947
		948	#if 0 /* this is actually harmless */
		949	if (coro->flags & CF_RUNNING)
		950	croak ("Coro::ready called on currently running coroutine");
		951	#endif
		952
		953	coro->flags |= CF_READY;
		954
		955	LOCK;
		956	coro_enq (SvREFCNT_inc (coro_sv));
		957	UNLOCK;
		958
		959	return 1;
		960	}
		961
		962	static int
		963	api_is_ready (SV *coro_sv)
		964	{
		965	return !!SvSTATE (coro_sv)->flags & CF_READY;
		966	}
		967
		968	static void
		969	prepare_schedule (struct transfer_args *ta)
		970	{
		971	SV *prev, *next;
		972
		973	for (;;)
		974	{
		975	LOCK;
		976	next = coro_deq (PRIO_MIN);
		977	UNLOCK;
		978
		979	if (next)
		980	break;
		981
		982	{
		983	dSP;
		984
		985	ENTER;
		986	SAVETMPS;
		987
		988	PUSHMARK (SP);
		989	PUTBACK;
		990	call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
		991
		992	FREETMPS;
		993	LEAVE;
		994	}
		995	}
		996
		997	prev = SvRV (coro_current);
		998	SvRV_set (coro_current, next);
		999
		1000	/* free this only after the transfer */
		1001	LOCK;
		1002	free_coro_mortal ();
		1003	UNLOCK;
		1004	coro_mortal = prev;
		1005
		1006	assert (!SvROK(prev));//D
		1007	assert (!SvROK(next));//D
		1008
		1009	ta->prev = SvSTATE (prev);
		1010	ta->next = SvSTATE (next);
		1011
		1012	assert (ta->next->flags & CF_READY);
		1013	ta->next->flags &= ~CF_READY;
		1014	}
		1015
		1016	static void
		1017	prepare_cede (struct transfer_args *ta)
		1018	{
		1019	api_ready (coro_current);
		1020
		1021	prepare_schedule (ta);
		1022	}
		1023
		1024	static void
		1025	api_schedule (void)
		1026	{
		1027	struct transfer_args ta;
		1028
		1029	prepare_schedule (&ta);
		1030	TRANSFER (ta);
		1031	}
		1032
		1033	static void
		1034	api_cede (void)
		1035	{
		1036	struct transfer_args ta;
		1037
		1038	prepare_cede (&ta);
		1039	TRANSFER (ta);
746	}	1040	}
747		1041
748	MODULE = Coro::State PACKAGE = Coro::State	1042	MODULE = Coro::State PACKAGE = Coro::State
749		1043
750	PROTOTYPES: ENABLE	1044	PROTOTYPES: DISABLE
751		1045
752	BOOT:	1046	BOOT:
753	{ /* {} necessary for stoopid perl-5.6.x */	1047	{
754	ucoro_state_sv = newSVpv (UCORO_STATE, sizeof(UCORO_STATE) - 1);	1048	#ifdef USE_ITHREADS
755	PERL_HASH(ucoro_state_hash, UCORO_STATE, sizeof(UCORO_STATE) - 1);	1049	MUTEX_INIT (&coro_mutex);
		1050	#endif
		1051	BOOT_PAGESIZE;
		1052
756	coro_state_stash = gv_stashpv ("Coro::State", TRUE);	1053	coro_state_stash = gv_stashpv ("Coro::State", TRUE);
757		1054
758	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));	1055	newCONSTSUB (coro_state_stash, "SAVE_DEFAV", newSViv (CORO_SAVE_DEFAV));
759	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));	1056	newCONSTSUB (coro_state_stash, "SAVE_DEFSV", newSViv (CORO_SAVE_DEFSV));
760	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));	1057	newCONSTSUB (coro_state_stash, "SAVE_ERRSV", newSViv (CORO_SAVE_ERRSV));
		1058	newCONSTSUB (coro_state_stash, "SAVE_IRSSV", newSViv (CORO_SAVE_IRSSV));
761	newCONSTSUB (coro_state_stash, "SAVE_CCTXT", newSViv (TRANSFER_SAVE_CCTXT));	1059	newCONSTSUB (coro_state_stash, "SAVE_ALL", newSViv (CORO_SAVE_ALL));
762
763	if (!padlist_cache)
764	padlist_cache = newHV ();
765		1060
766	main_mainstack = PL_mainstack;	1061	main_mainstack = PL_mainstack;
767	}
768		1062
769	Coro::State	1063	coroapi.ver = CORO_API_VERSION;
770	_newprocess(args)	1064	coroapi.transfer = api_transfer;
771	SV * args	1065
772	PROTOTYPE: $	1066	assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
		1067	}
		1068
		1069	SV *
		1070	new (char *klass, ...)
773	CODE:	1071	CODE:
774	Coro__State coro;	1072	{
		1073	struct coro *coro;
		1074	HV *hv;
		1075	int i;
775		1076
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);	1077	Newz (0, coro, 1, struct coro);
		1078	coro->args = newAV ();
		1079	coro->save = CORO_SAVE_ALL;
		1080	coro->flags = CF_NEW;
780		1081
781	coro->args = (AV *)SvREFCNT_inc (SvRV (args));	1082	hv = newHV ();
782	coro->mainstack = 0; /* actual work is done inside transfer */	1083	sv_magicext ((SV *)hv, 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro, 0)->mg_flags |= MGf_DUP;
783	coro->stack = 0;	1084	RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
784		1085
785	RETVAL = coro;	1086	for (i = 1; i < items; i++)
		1087	av_push (coro->args, newSVsv (ST (i)));
		1088	}
786	OUTPUT:	1089	OUTPUT:
787	RETVAL	1090	RETVAL
788		1091
		1092	int
		1093	save (SV *coro, int new_save = -1)
		1094	CODE:
		1095	RETVAL = api_save (coro, new_save);
		1096	OUTPUT:
		1097	RETVAL
		1098
789	void	1099	void
790	transfer(prev, next, flags = TRANSFER_SAVE_ALL | TRANSFER_LAZY_STACK)	1100	_set_stacklevel (...)
791	Coro::State_or_hashref prev	1101	ALIAS:
792	Coro::State_or_hashref next	1102	Coro::State::transfer = 1
793	int flags	1103	Coro::schedule = 2
794	PROTOTYPE: @	1104	Coro::cede = 3
795	CODE:	1105	CODE:
796	transfer (aTHX_ prev, next, flags);	1106	{
		1107	struct transfer_args ta;
		1108
		1109	switch (ix)
		1110	{
		1111	case 0:
		1112	ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
		1113	ta.next = 0;
		1114	break;
		1115
		1116	case 1:
		1117	if (items != 2)
		1118	croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
		1119
		1120	prepare_transfer (&ta, ST (0), ST (1));
		1121	break;
		1122
		1123	case 2:
		1124	prepare_schedule (&ta);
		1125	break;
		1126
		1127	case 3:
		1128	prepare_cede (&ta);
		1129	break;
		1130	}
		1131
		1132	TRANSFER (ta);
		1133	}
797		1134
798	void	1135	void
799	DESTROY(coro)	1136	_clone_state_from (SV *dst, SV *src)
800	Coro::State coro	1137	CODE:
		1138	{
		1139	struct coro *coro_src = SvSTATE (src);
		1140
		1141	sv_unmagic (SvRV (dst), PERL_MAGIC_ext);
		1142
		1143	++coro_src->refcnt;
		1144	sv_magicext (SvRV (dst), 0, PERL_MAGIC_ext, &coro_state_vtbl, (char *)coro_src, 0)->mg_flags |= MGf_DUP;
		1145	}
		1146
		1147	void
		1148	_exit (code)
		1149	int code
		1150	PROTOTYPE: $
		1151	CODE:
		1152	_exit (code);
		1153
		1154	int
		1155	cctx_count ()
		1156	CODE:
		1157	RETVAL = cctx_count;
		1158	OUTPUT:
		1159	RETVAL
		1160
		1161	int
		1162	cctx_idle ()
		1163	CODE:
		1164	RETVAL = cctx_idle;
		1165	OUTPUT:
		1166	RETVAL
		1167
		1168	MODULE = Coro::State PACKAGE = Coro
		1169
		1170	BOOT:
		1171	{
		1172	int i;
		1173
		1174	coro_stash = gv_stashpv ("Coro", TRUE);
		1175
		1176	newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
		1177	newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
		1178	newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
		1179	newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
		1180	newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
		1181	newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
		1182
		1183	coro_current = get_sv ("Coro::current", FALSE);
		1184	SvREADONLY_on (coro_current);
		1185
		1186	for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
		1187	coro_ready[i] = newAV ();
		1188
		1189	{
		1190	SV *sv = perl_get_sv("Coro::API", 1);
		1191
		1192	coroapi.schedule = api_schedule;
		1193	coroapi.save = api_save;
		1194	coroapi.cede = api_cede;
		1195	coroapi.ready = api_ready;
		1196	coroapi.is_ready = api_is_ready;
		1197	coroapi.nready = &coro_nready;
		1198	coroapi.current = coro_current;
		1199
		1200	GCoroAPI = &coroapi;
		1201	sv_setiv (sv, (IV)&coroapi);
		1202	SvREADONLY_on (sv);
		1203	}
		1204	}
		1205
		1206	void
		1207	_set_current (SV *current)
		1208	PROTOTYPE: $
		1209	CODE:
		1210	SvREFCNT_dec (SvRV (coro_current));
		1211	SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
		1212
		1213	int
		1214	prio (Coro::State coro, int newprio = 0)
		1215	ALIAS:
		1216	nice = 1
801	CODE:	1217	CODE:
		1218	{
		1219	RETVAL = coro->prio;
802		1220
803	if (coro->mainstack && coro->mainstack != main_mainstack)	1221	if (items > 1)
804	{	1222	{
805	struct coro temp;	1223	if (ix)
		1224	newprio += coro->prio;
806		1225
807	SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);	1226	if (newprio < PRIO_MIN) newprio = PRIO_MIN;
808	LOAD(aTHX_ coro);	1227	if (newprio > PRIO_MAX) newprio = PRIO_MAX;
809		1228
810	destroy_stacks (aTHX);	1229	coro->prio = newprio;
811
812	LOAD((&temp)); /* this will get rid of defsv etc.. */
813
814	coro->mainstack = 0;
815	}	1230	}
		1231	}
816		1232
817	deallocate_stack (coro);	1233	SV *
		1234	ready (SV *self)
		1235	PROTOTYPE: $
		1236	CODE:
		1237	RETVAL = boolSV (api_ready (self));
		1238	OUTPUT:
		1239	RETVAL
818		1240
819	Safefree (coro);	1241	SV *
		1242	is_ready (SV *self)
		1243	PROTOTYPE: $
		1244	CODE:
		1245	RETVAL = boolSV (api_is_ready (self));
		1246	OUTPUT:
		1247	RETVAL
		1248
		1249	int
		1250	nready (...)
		1251	PROTOTYPE:
		1252	CODE:
		1253	RETVAL = coro_nready;
		1254	OUTPUT:
		1255	RETVAL
		1256
		1257	MODULE = Coro::State PACKAGE = Coro::AIO
		1258
		1259	SV *
		1260	_get_state ()
		1261	CODE:
		1262	{
		1263	struct io_state *data;
		1264
		1265	RETVAL = newSV (sizeof (struct io_state));
		1266	data = (struct io_state *)SvPVX (RETVAL);
		1267	SvCUR_set (RETVAL, sizeof (struct io_state));
		1268	SvPOK_only (RETVAL);
		1269
		1270	data->errorno = errno;
		1271	data->laststype = PL_laststype;
		1272	data->laststatval = PL_laststatval;
		1273	data->statcache = PL_statcache;
		1274	}
		1275	OUTPUT:
		1276	RETVAL
820		1277
821	void	1278	void
822	flush()	1279	_set_state (char *data_)
		1280	PROTOTYPE: $
823	CODE:	1281	CODE:
824	#ifdef MAY_FLUSH	1282	{
825	flush_padlist_cache ();	1283	struct io_state *data = (void *)data_;
826	#endif
827		1284
828	MODULE = Coro::State PACKAGE = Coro::Cont	1285	errno = data->errorno;
		1286	PL_laststype = data->laststype;
		1287	PL_laststatval = data->laststatval;
		1288	PL_statcache = data->statcache;
		1289	}
829		1290
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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