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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.44 by root, Sat Oct 21 23:20:29 2006 UTC vs.
Revision 1.90 by root, Tue Oct 31 00:32:19 2006 UTC

		1	/* solaris */
		2	#define _POSIX_PTHREAD_SEMANTICS 1
		3
		4	#if __linux && !defined(_GNU_SOURCE)
		5	# define _GNU_SOURCE
		6	#endif
		7
		8	/* just in case */
1	#define _REENTRANT 1	9	#define _REENTRANT 1
		10
2	#include <errno.h>	11	#include <errno.h>
3		12
4	#include "EXTERN.h"	13	#include "EXTERN.h"
5	#include "perl.h"	14	#include "perl.h"
6	#include "XSUB.h"	15	#include "XSUB.h"
…		…
9		18
10	#include <pthread.h>	19	#include <pthread.h>
11		20
12	#include <stddef.h>	21	#include <stddef.h>
13	#include <errno.h>	22	#include <errno.h>
		23	#include <sys/time.h>
		24	#include <sys/select.h>
14	#include <sys/types.h>	25	#include <sys/types.h>
15	#include <sys/stat.h>	26	#include <sys/stat.h>
16	#include <limits.h>	27	#include <limits.h>
17	#include <unistd.h>	28	#include <unistd.h>
18	#include <fcntl.h>	29	#include <fcntl.h>
…		…
32	# else	43	# else
33	# error sendfile support requested but not available	44	# error sendfile support requested but not available
34	# endif	45	# endif
35	#endif	46	#endif
36		47
		48	/* number of seconds after which idle threads exit */
		49	#define IDLE_TIMEOUT 10
		50
37	/* used for struct dirent, AIX doesn't provide it */	51	/* used for struct dirent, AIX doesn't provide it */
38	#ifndef NAME_MAX	52	#ifndef NAME_MAX
39	# define NAME_MAX 4096	53	# define NAME_MAX 4096
40	#endif	54	#endif
41		55
		56	#ifndef PTHREAD_STACK_MIN
		57	/* care for broken platforms, e.g. windows */
		58	# define PTHREAD_STACK_MIN 16384
		59	#endif
		60
42	#if __ia64	61	#if __ia64
43	# define STACKSIZE 65536	62	# define STACKSIZE 65536
		63	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		64	# define STACKSIZE PTHREAD_STACK_MIN
44	#else	65	#else
45	# define STACKSIZE 8192	66	# define STACKSIZE 16384
46	#endif	67	#endif
		68
		69	/* wether word reads are potentially non-atomic.
		70	* this is conservatice, likely most arches this runs
		71	* on have atomic word read/writes.
		72	*/
		73	#ifndef WORDACCESS_UNSAFE
		74	# if __i386 || __x86_64
		75	# define WORDACCESS_UNSAFE 0
		76	# else
		77	# define WORDACCESS_UNSAFE 1
		78	# endif
		79	#endif
		80
		81	/* buffer size for various temporary buffers */
		82	#define AIO_BUFSIZE 65536
		83
		84	#define dBUF \
		85	char *aio_buf; \
		86	LOCK (wrklock); \
		87	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		88	UNLOCK (wrklock); \
		89	if (!aio_buf) \
		90	return -1;
		91
		92	typedef SV SV8; /* byte-sv, used for argument-checking */
47		93
48	enum {	94	enum {
49	REQ_QUIT,	95	REQ_QUIT,
50	REQ_OPEN, REQ_CLOSE,	96	REQ_OPEN, REQ_CLOSE,
51	REQ_READ, REQ_WRITE, REQ_READAHEAD,	97	REQ_READ, REQ_WRITE, REQ_READAHEAD,
52	REQ_SENDFILE,	98	REQ_SENDFILE,
53	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	99	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
54	REQ_FSYNC, REQ_FDATASYNC,	100	REQ_FSYNC, REQ_FDATASYNC,
55	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,	101	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
56	REQ_READDIR,	102	REQ_MKNOD, REQ_READDIR,
57	REQ_LINK, REQ_SYMLINK,	103	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
58	REQ_GROUP,	104	REQ_GROUP, REQ_NOP,
		105	REQ_BUSY,
59	};	106	};
60		107
61	#define AIO_REQ_KLASS "IO::AIO::REQ"	108	#define AIO_REQ_KLASS "IO::AIO::REQ"
62	#define AIO_GRP_KLASS "IO::AIO::GRP"	109	#define AIO_GRP_KLASS "IO::AIO::GRP"
63		110
64	typedef struct aio_cb	111	typedef struct aio_cb
65	{	112	{
66	struct aio_cb *grp, *grp_prev, *grp_next;
67
68	struct aio_cb *volatile next;	113	struct aio_cb *volatile next;
69		114
		115	SV *callback, *fh;
		116	SV *sv1, *sv2;
		117	void *ptr1, *ptr2;
		118	off_t offs;
		119	size_t size;
		120	ssize_t result;
		121
		122	STRLEN stroffset;
		123	int type;
		124	int int1, int2;
		125	int errorno;
		126	mode_t mode; /* open */
		127
		128	unsigned char flags;
		129	unsigned char pri;
		130
70	SV *self; /* the perl counterpart of this request, if any */	131	SV *self; /* the perl counterpart of this request, if any */
71		132	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
72	SV *data, *callback;
73	SV *fh, *fh2;
74	void *dataptr, *data2ptr;
75	Stat_t *statdata;
76	off_t offset;
77	size_t length;
78	ssize_t result;
79
80	int type;
81	int fd, fd2;
82	int errorno;
83	STRLEN dataoffset;
84	mode_t mode; /* open */
85	unsigned char cancelled;
86	} aio_cb;	133	} aio_cb;
		134
		135	enum {
		136	FLAG_CANCELLED = 0x01, /* request was cancelled */
		137	FLAG_SV1_RO_OFF = 0x40, /* data was set readonly */
		138	FLAG_PTR2_FREE = 0x80, /* need to free(ptr2) */
		139	};
87		140
88	typedef aio_cb *aio_req;	141	typedef aio_cb *aio_req;
89	typedef aio_cb *aio_req_ornot;	142	typedef aio_cb *aio_req_ornot;
90	typedef aio_cb *aio_group;
91		143
		144	enum {
		145	PRI_MIN = -4,
		146	PRI_MAX = 4,
		147
		148	DEFAULT_PRI = 0,
		149	PRI_BIAS = -PRI_MIN,
		150	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		151	};
		152
		153	#define AIO_TICKS ((1000000 + 1023) >> 10)
		154
		155	static unsigned int max_poll_time = 0;
		156	static unsigned int max_poll_reqs = 0;
		157
		158	/* calculcate time difference in ~1/AIO_TICKS of a second */
		159	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		160	{
		161	return (tv2->tv_sec - tv1->tv_sec ) * AIO_TICKS
		162	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		163	}
		164
		165	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		166
92	static int started, wanted;	167	static unsigned int started, idle, wanted;
93	static volatile int nreqs;	168
94	static int max_outstanding = 1<<30;	169	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		170	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		171	#else
		172	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
		173	#endif
		174
		175	#define LOCK(mutex) pthread_mutex_lock (&(mutex))
		176	#define UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
		177
		178	/* worker threads management */
		179	static pthread_mutex_t wrklock = AIO_MUTEX_INIT;
		180
		181	typedef struct worker {
		182	/* locked by wrklock */
		183	struct worker *prev, *next;
		184
		185	pthread_t tid;
		186
		187	/* locked by reslock, reqlock or wrklock */
		188	aio_req req; /* currently processed request */
		189	void *dbuf;
		190	DIR *dirp;
		191	} worker;
		192
		193	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		194
		195	static void worker_clear (worker *wrk)
		196	{
		197	if (wrk->dirp)
		198	{
		199	closedir (wrk->dirp);
		200	wrk->dirp = 0;
		201	}
		202
		203	if (wrk->dbuf)
		204	{
		205	free (wrk->dbuf);
		206	wrk->dbuf = 0;
		207	}
		208	}
		209
		210	static void worker_free (worker *wrk)
		211	{
		212	wrk->next->prev = wrk->prev;
		213	wrk->prev->next = wrk->next;
		214
		215	free (wrk);
		216	}
		217
		218	static volatile unsigned int nreqs, nready, npending;
		219	static volatile unsigned int max_idle = 4;
		220	static volatile unsigned int max_outstanding = 0xffffffff;
95	static int respipe [2];	221	static int respipe [2];
96		222
97	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	223	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
98	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	224	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
99	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	225	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
100		226
101	static volatile aio_req reqs, reqe; /* queue start, queue end */	227	#if WORDACCESS_UNSAFE
102	static volatile aio_req ress, rese; /* queue start, queue end */	228
		229	static unsigned int get_nready ()
		230	{
		231	unsigned int retval;
		232
		233	LOCK (reqlock);
		234	retval = nready;
		235	UNLOCK (reqlock);
		236
		237	return retval;
		238	}
		239
		240	static unsigned int get_npending ()
		241	{
		242	unsigned int retval;
		243
		244	LOCK (reslock);
		245	retval = npending;
		246	UNLOCK (reslock);
		247
		248	return retval;
		249	}
		250
		251	static unsigned int get_nthreads ()
		252	{
		253	unsigned int retval;
		254
		255	LOCK (wrklock);
		256	retval = started;
		257	UNLOCK (wrklock);
		258
		259	return retval;
		260	}
		261
		262	#else
		263
		264	# define get_nready() nready
		265	# define get_npending() npending
		266	# define get_nthreads() started
		267
		268	#endif
		269
		270	/*
		271	* a somewhat faster data structure might be nice, but
		272	* with 8 priorities this actually needs <20 insns
		273	* per shift, the most expensive operation.
		274	*/
		275	typedef struct {
		276	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		277	int size;
		278	} reqq;
		279
		280	static reqq req_queue;
		281	static reqq res_queue;
		282
		283	int reqq_push (reqq *q, aio_req req)
		284	{
		285	int pri = req->pri;
		286	req->next = 0;
		287
		288	if (q->qe[pri])
		289	{
		290	q->qe[pri]->next = req;
		291	q->qe[pri] = req;
		292	}
		293	else
		294	q->qe[pri] = q->qs[pri] = req;
		295
		296	return q->size++;
		297	}
		298
		299	aio_req reqq_shift (reqq *q)
		300	{
		301	int pri;
		302
		303	if (!q->size)
		304	return 0;
		305
		306	--q->size;
		307
		308	for (pri = NUM_PRI; pri--; )
		309	{
		310	aio_req req = q->qs[pri];
		311
		312	if (req)
		313	{
		314	if (!(q->qs[pri] = req->next))
		315	q->qe[pri] = 0;
		316
		317	return req;
		318	}
		319	}
		320
		321	abort ();
		322	}
		323
		324	static int poll_cb ();
		325	static void req_invoke (aio_req req);
		326	static void req_free (aio_req req);
		327	static void req_cancel (aio_req req);
103		328
104	/* must be called at most once */	329	/* must be called at most once */
105	static SV *req_sv (aio_req req, const char *klass)	330	static SV *req_sv (aio_req req, const char *klass)
106	{	331	{
		332	if (!req->self)
		333	{
107	req->self = (SV *)newHV ();	334	req->self = (SV *)newHV ();
108	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);	335	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		336	}
109		337
110	return sv_2mortal (sv_bless (newRV_noinc (req->self), gv_stashpv (klass, 1)));	338	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
111	}	339	}
112		340
113	static aio_req SvAIO_REQ (SV *sv, const char *klass)	341	static aio_req SvAIO_REQ (SV *sv)
114	{	342	{
		343	MAGIC *mg;
		344
115	if (!sv_derived_from (sv, klass) || !SvROK (sv))	345	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
116	croak ("object of class %s expected", klass);	346	croak ("object of class " AIO_REQ_KLASS " expected");
117		347
118	MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext);	348	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
119		349
120	return mg ? (aio_req)mg->mg_ptr : 0;	350	return mg ? (aio_req)mg->mg_ptr : 0;
		351	}
		352
		353	static void aio_grp_feed (aio_req grp)
		354	{
		355	while (grp->size < grp->int2 && !(grp->flags & FLAG_CANCELLED))
		356	{
		357	int old_len = grp->size;
		358
		359	if (grp->sv2 && SvOK (grp->sv2))
		360	{
		361	dSP;
		362
		363	ENTER;
		364	SAVETMPS;
		365	PUSHMARK (SP);
		366	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		367	PUTBACK;
		368	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		369	SPAGAIN;
		370	FREETMPS;
		371	LEAVE;
		372	}
		373
		374	/* stop if no progress has been made */
		375	if (old_len == grp->size)
		376	{
		377	SvREFCNT_dec (grp->sv2);
		378	grp->sv2 = 0;
		379	break;
		380	}
		381	}
		382	}
		383
		384	static void aio_grp_dec (aio_req grp)
		385	{
		386	--grp->size;
		387
		388	/* call feeder, if applicable */
		389	aio_grp_feed (grp);
		390
		391	/* finish, if done */
		392	if (!grp->size && grp->int1)
		393	{
		394	req_invoke (grp);
		395	req_free (grp);
		396	}
		397	}
		398
		399	static void req_invoke (aio_req req)
		400	{
		401	dSP;
		402
		403	if (req->flags & FLAG_SV1_RO_OFF)
		404	SvREADONLY_off (req->sv1);
		405
		406	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		407	{
		408	ENTER;
		409	SAVETMPS;
		410	PUSHMARK (SP);
		411	EXTEND (SP, 1);
		412
		413	switch (req->type)
		414	{
		415	case REQ_READDIR:
		416	{
		417	SV *rv = &PL_sv_undef;
		418
		419	if (req->result >= 0)
		420	{
		421	int i;
		422	char *buf = req->ptr2;
		423	AV *av = newAV ();
		424
		425	av_extend (av, req->result - 1);
		426
		427	for (i = 0; i < req->result; ++i)
		428	{
		429	SV *sv = newSVpv (buf, 0);
		430
		431	av_store (av, i, sv);
		432	buf += SvCUR (sv) + 1;
		433	}
		434
		435	rv = sv_2mortal (newRV_noinc ((SV *)av));
		436	}
		437
		438	PUSHs (rv);
		439	}
		440	break;
		441
		442	case REQ_OPEN:
		443	{
		444	/* convert fd to fh */
		445	SV *fh;
		446
		447	PUSHs (sv_2mortal (newSViv (req->result)));
		448	PUTBACK;
		449	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		450	SPAGAIN;
		451
		452	fh = SvREFCNT_inc (POPs);
		453
		454	PUSHMARK (SP);
		455	XPUSHs (sv_2mortal (fh));
		456	}
		457	break;
		458
		459	case REQ_GROUP:
		460	req->int1 = 2; /* mark group as finished */
		461
		462	if (req->sv1)
		463	{
		464	int i;
		465	AV *av = (AV *)req->sv1;
		466
		467	EXTEND (SP, AvFILL (av) + 1);
		468	for (i = 0; i <= AvFILL (av); ++i)
		469	PUSHs (*av_fetch (av, i, 0));
		470	}
		471	break;
		472
		473	case REQ_NOP:
		474	case REQ_BUSY:
		475	break;
		476
		477	case REQ_READLINK:
		478	if (req->result > 0)
		479	{
		480	SvCUR_set (req->sv1, req->result);
		481	*SvEND (req->sv1) = 0;
		482	PUSHs (req->sv1);
		483	}
		484	break;
		485
		486	case REQ_STAT:
		487	case REQ_LSTAT:
		488	case REQ_FSTAT:
		489	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		490	PL_laststatval = req->result;
		491	PL_statcache = *(Stat_t *)(req->ptr2);
		492	PUSHs (sv_2mortal (newSViv (req->result)));
		493	break;
		494
		495	case REQ_READ:
		496	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		497	*SvEND (req->sv1) = 0;
		498	PUSHs (sv_2mortal (newSViv (req->result)));
		499	break;
		500
		501	default:
		502	PUSHs (sv_2mortal (newSViv (req->result)));
		503	break;
		504	}
		505
		506	errno = req->errorno;
		507
		508	PUTBACK;
		509	call_sv (req->callback, G_VOID | G_EVAL);
		510	SPAGAIN;
		511
		512	FREETMPS;
		513	LEAVE;
		514	}
		515
		516	if (req->grp)
		517	{
		518	aio_req grp = req->grp;
		519
		520	/* unlink request */
		521	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		522	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		523
		524	if (grp->grp_first == req)
		525	grp->grp_first = req->grp_next;
		526
		527	aio_grp_dec (grp);
		528	}
		529
		530	if (SvTRUE (ERRSV))
		531	{
		532	req_free (req);
		533	croak (0);
		534	}
121	}	535	}
122		536
123	static void req_free (aio_req req)	537	static void req_free (aio_req req)
124	{	538	{
125	if (req->self)	539	if (req->self)
126	{	540	{
127	sv_unmagic (req->self, PERL_MAGIC_ext);	541	sv_unmagic (req->self, PERL_MAGIC_ext);
128	SvREFCNT_dec (req->self);	542	SvREFCNT_dec (req->self);
129	}	543	}
130		544
131	if (req->data)
132	SvREFCNT_dec (req->data);
133
134	if (req->fh)
135	SvREFCNT_dec (req->fh);	545	SvREFCNT_dec (req->fh);
136		546	SvREFCNT_dec (req->sv1);
137	if (req->fh2)
138	SvREFCNT_dec (req->fh2);	547	SvREFCNT_dec (req->sv2);
139
140	if (req->statdata)
141	Safefree (req->statdata);
142
143	if (req->callback)
144	SvREFCNT_dec (req->callback);	548	SvREFCNT_dec (req->callback);
145		549
146	if (req->type == REQ_READDIR && req->result >= 0)	550	if (req->flags & FLAG_PTR2_FREE)
147	free (req->data2ptr);	551	free (req->ptr2);
148		552
149	Safefree (req);	553	Safefree (req);
150	}	554	}
151		555
152	static void	556	static void req_cancel_subs (aio_req grp)
153	poll_wait ()
154	{	557	{
155	if (nreqs && !ress)	558	aio_req sub;
		559
		560	if (grp->type != REQ_GROUP)
		561	return;
		562
		563	SvREFCNT_dec (grp->sv2);
		564	grp->sv2 = 0;
		565
		566	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		567	req_cancel (sub);
		568	}
		569
		570	static void req_cancel (aio_req req)
		571	{
		572	req->flags |= FLAG_CANCELLED;
		573
		574	req_cancel_subs (req);
		575	}
		576
		577	static void *aio_proc(void *arg);
		578
		579	static void start_thread (void)
		580	{
		581	sigset_t fullsigset, oldsigset;
		582	pthread_attr_t attr;
		583
		584	worker *wrk = calloc (1, sizeof (worker));
		585
		586	if (!wrk)
		587	croak ("unable to allocate worker thread data");
		588
		589	pthread_attr_init (&attr);
		590	pthread_attr_setstacksize (&attr, STACKSIZE);
		591	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		592	#ifdef PTHREAD_SCOPE_PROCESS
		593	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		594	#endif
		595
		596	sigfillset (&fullsigset);
		597
		598	LOCK (wrklock);
		599	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
		600
		601	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
156	{	602	{
		603	wrk->prev = &wrk_first;
		604	wrk->next = wrk_first.next;
		605	wrk_first.next->prev = wrk;
		606	wrk_first.next = wrk;
		607	++started;
		608	}
		609	else
		610	free (wrk);
		611
		612	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		613	UNLOCK (wrklock);
		614	}
		615
		616	static void maybe_start_thread ()
		617	{
		618	if (get_nthreads () >= wanted)
		619	return;
		620
		621	/* todo: maybe use idle here, but might be less exact */
		622	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		623	return;
		624
		625	start_thread ();
		626	}
		627
		628	static void req_send (aio_req req)
		629	{
		630	++nreqs;
		631
		632	LOCK (reqlock);
		633	++nready;
		634	reqq_push (&req_queue, req);
		635	pthread_cond_signal (&reqwait);
		636	UNLOCK (reqlock);
		637
		638	maybe_start_thread ();
		639	}
		640
		641	static void end_thread (void)
		642	{
		643	aio_req req;
		644
		645	Newz (0, req, 1, aio_cb);
		646
		647	req->type = REQ_QUIT;
		648	req->pri = PRI_MAX + PRI_BIAS;
		649
		650	LOCK (reqlock);
		651	reqq_push (&req_queue, req);
		652	pthread_cond_signal (&reqwait);
		653	UNLOCK (reqlock);
		654
		655	LOCK (wrklock);
		656	--started;
		657	UNLOCK (wrklock);
		658	}
		659
		660	static void set_max_idle (int nthreads)
		661	{
		662	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		663	max_idle = nthreads <= 0 ? 1 : nthreads;
		664	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
		665	}
		666
		667	static void min_parallel (int nthreads)
		668	{
		669	if (wanted < nthreads)
		670	wanted = nthreads;
		671	}
		672
		673	static void max_parallel (int nthreads)
		674	{
		675	if (wanted > nthreads)
		676	wanted = nthreads;
		677
		678	while (started > wanted)
		679	end_thread ();
		680	}
		681
		682	static void poll_wait ()
		683	{
157	fd_set rfd;	684	fd_set rfd;
		685
		686	while (nreqs)
		687	{
		688	int size;
		689	if (WORDACCESS_UNSAFE) LOCK (reslock);
		690	size = res_queue.size;
		691	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		692
		693	if (size)
		694	return;
		695
		696	maybe_start_thread ();
		697
158	FD_ZERO(&rfd);	698	FD_ZERO(&rfd);
159	FD_SET(respipe [0], &rfd);	699	FD_SET(respipe [0], &rfd);
160		700
161	select (respipe [0] + 1, &rfd, 0, 0, 0);	701	select (respipe [0] + 1, &rfd, 0, 0, 0);
162	}	702	}
163	}	703	}
164		704
165	static int	705	static int poll_cb ()
166	poll_cb ()
167	{	706	{
168	dSP;	707	dSP;
169	int count = 0;	708	int count = 0;
		709	int maxreqs = max_poll_reqs;
170	int do_croak = 0;	710	int do_croak = 0;
		711	struct timeval tv_start, tv_now;
171	aio_req req;	712	aio_req req;
		713
		714	if (max_poll_time)
		715	gettimeofday (&tv_start, 0);
172		716
173	for (;;)	717	for (;;)
174	{	718	{
175	pthread_mutex_lock (&reslock);	719	for (;;)
176	req = ress;
177
178	if (req)
179	{	720	{
180	ress = req->next;	721	maybe_start_thread ();
181		722
		723	LOCK (reslock);
		724	req = reqq_shift (&res_queue);
		725
182	if (!ress)	726	if (req)
183	{	727	{
		728	--npending;
		729
		730	if (!res_queue.size)
		731	{
184	/* read any signals sent by the worker threads */	732	/* read any signals sent by the worker threads */
185	char buf [32];	733	char buf [32];
186	while (read (respipe [0], buf, 32) == 32)	734	while (read (respipe [0], buf, 32) == 32)
		735	;
187	;	736	}
188
189	rese = 0;
190	}	737	}
191	}
192		738
193	pthread_mutex_unlock (&reslock);	739	UNLOCK (reslock);
194		740
195	if (!req)	741	if (!req)
196	break;	742	break;
197		743
198	nreqs--;	744	--nreqs;
199		745
200	if (req->type == REQ_QUIT)
201	started--;
202	else
203	{
204	int errorno = errno;
205	errno = req->errorno;
206
207	if (req->type == REQ_READ)	746	if (req->type == REQ_GROUP && req->size)
208	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
209
210	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
211	SvREADONLY_off (req->data);
212
213	if (req->statdata)
214	{	747	{
215	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	748	req->int1 = 1; /* mark request as delayed */
216	PL_laststatval = req->result;	749	continue;
217	PL_statcache = *(req->statdata);
218	}
219
220	ENTER;
221	PUSHMARK (SP);
222
223	if (req->type == REQ_READDIR)
224	{
225	SV *rv = &PL_sv_undef;
226
227	if (req->result >= 0)
228	{
229	char *buf = req->data2ptr;
230	AV *av = newAV ();
231
232	while (req->result)
233	{
234	SV *sv = newSVpv (buf, 0);
235
236	av_push (av, sv);
237	buf += SvCUR (sv) + 1;
238	req->result--;
239	}
240
241	rv = sv_2mortal (newRV_noinc ((SV *)av));
242	}
243
244	XPUSHs (rv);
245	}	750	}
246	else	751	else
247	{	752	{
248	XPUSHs (sv_2mortal (newSViv (req->result)));	753	req_invoke (req);
249		754
250	if (req->type == REQ_OPEN)	755	count++;
251	{
252	/* convert fd to fh */
253	SV *fh;
254
255	PUTBACK;
256	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
257	SPAGAIN;
258
259	fh = SvREFCNT_inc (POPs);
260
261	PUSHMARK (SP);
262	XPUSHs (sv_2mortal (fh));
263	}
264	}	756	}
265		757
266	if (SvOK (req->callback) && !req->cancelled)	758	req_free (req);
		759
		760	if (maxreqs && !--maxreqs)
		761	break;
		762
		763	if (max_poll_time)
267	{	764	{
268	PUTBACK;	765	gettimeofday (&tv_now, 0);
269	call_sv (req->callback, G_VOID | G_EVAL);
270	SPAGAIN;
271		766
272	if (SvTRUE (ERRSV))	767	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
273	{	768	break;
274	req_free (req);
275	croak (0);
276	}
277	}	769	}
278
279	LEAVE;
280
281	errno = errorno;
282	count++;
283	}	770	}
284		771
285	req_free (req);	772	if (nreqs <= max_outstanding)
		773	break;
		774
		775	poll_wait ();
		776
		777	++maxreqs;
286	}	778	}
287		779
288	return count;	780	return count;
289	}
290
291	static void *aio_proc(void *arg);
292
293	static void
294	start_thread (void)
295	{
296	sigset_t fullsigset, oldsigset;
297	pthread_t tid;
298	pthread_attr_t attr;
299
300	pthread_attr_init (&attr);
301	pthread_attr_setstacksize (&attr, STACKSIZE);
302	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
303
304	sigfillset (&fullsigset);
305	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
306
307	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
308	started++;
309
310	sigprocmask (SIG_SETMASK, &oldsigset, 0);
311	}
312
313	static void
314	req_send (aio_req req)
315	{
316	while (started < wanted && nreqs >= started)
317	start_thread ();
318
319	nreqs++;
320
321	pthread_mutex_lock (&reqlock);
322
323	req->next = 0;
324
325	if (reqe)
326	{
327	reqe->next = req;
328	reqe = req;
329	}
330	else
331	reqe = reqs = req;
332
333	pthread_cond_signal (&reqwait);
334	pthread_mutex_unlock (&reqlock);
335
336	if (nreqs > max_outstanding)
337	for (;;)
338	{
339	poll_cb ();
340
341	if (nreqs <= max_outstanding)
342	break;
343
344	poll_wait ();
345	}
346	}
347
348	static void
349	end_thread (void)
350	{
351	aio_req req;
352	Newz (0, req, 1, aio_cb);
353	req->type = REQ_QUIT;
354
355	req_send (req);
356	}
357
358	static void min_parallel (int nthreads)
359	{
360	if (wanted < nthreads)
361	wanted = nthreads;
362	}
363
364	static void max_parallel (int nthreads)
365	{
366	int cur = started;
367
368	if (wanted > nthreads)
369	wanted = nthreads;
370
371	while (cur > wanted)
372	{
373	end_thread ();
374	cur--;
375	}
376
377	while (started > wanted)
378	{
379	poll_wait ();
380	poll_cb ();
381	}
382	}	781	}
383		782
384	static void create_pipe ()	783	static void create_pipe ()
385	{	784	{
386	if (pipe (respipe))	785	if (pipe (respipe))
…		…
405	* normal read/write by using a mutex. slows down execution a lot,	804	* normal read/write by using a mutex. slows down execution a lot,
406	* but that's your problem, not mine.	805	* but that's your problem, not mine.
407	*/	806	*/
408	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;	807	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
409		808
410	static ssize_t	809	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
411	pread (int fd, void *buf, size_t count, off_t offset)
412	{	810	{
413	ssize_t res;	811	ssize_t res;
414	off_t ooffset;	812	off_t ooffset;
415		813
416	pthread_mutex_lock (&preadwritelock);	814	LOCK (preadwritelock);
417	ooffset = lseek (fd, 0, SEEK_CUR);	815	ooffset = lseek (fd, 0, SEEK_CUR);
418	lseek (fd, offset, SEEK_SET);	816	lseek (fd, offset, SEEK_SET);
419	res = read (fd, buf, count);	817	res = read (fd, buf, count);
420	lseek (fd, ooffset, SEEK_SET);	818	lseek (fd, ooffset, SEEK_SET);
421	pthread_mutex_unlock (&preadwritelock);	819	UNLOCK (preadwritelock);
422		820
423	return res;	821	return res;
424	}	822	}
425		823
426	static ssize_t
427	pwrite (int fd, void *buf, size_t count, off_t offset)	824	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
428	{	825	{
429	ssize_t res;	826	ssize_t res;
430	off_t ooffset;	827	off_t ooffset;
431		828
432	pthread_mutex_lock (&preadwritelock);	829	LOCK (preadwritelock);
433	ooffset = lseek (fd, 0, SEEK_CUR);	830	ooffset = lseek (fd, 0, SEEK_CUR);
434	lseek (fd, offset, SEEK_SET);	831	lseek (fd, offset, SEEK_SET);
435	res = write (fd, buf, count);	832	res = write (fd, buf, count);
436	lseek (fd, offset, SEEK_SET);	833	lseek (fd, offset, SEEK_SET);
437	pthread_mutex_unlock (&preadwritelock);	834	UNLOCK (preadwritelock);
438		835
439	return res;	836	return res;
440	}	837	}
441	#endif	838	#endif
442		839
443	#if !HAVE_FDATASYNC	840	#if !HAVE_FDATASYNC
444	# define fdatasync fsync	841	# define fdatasync fsync
445	#endif	842	#endif
446		843
447	#if !HAVE_READAHEAD	844	#if !HAVE_READAHEAD
448	# define readahead aio_readahead	845	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
449		846
450	static ssize_t	847	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
451	readahead (int fd, off_t offset, size_t count)
452	{	848	{
453	char readahead_buf[4096];	849	dBUF;
454		850
455	while (count > 0)	851	while (count > 0)
456	{	852	{
457	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	853	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
458		854
459	pread (fd, readahead_buf, len, offset);	855	pread (fd, aio_buf, len, offset);
460	offset += len;	856	offset += len;
461	count -= len;	857	count -= len;
462	}	858	}
463		859
464	errno = 0;	860	errno = 0;
465	}	861	}
		862
466	#endif	863	#endif
467		864
468	#if !HAVE_READDIR_R	865	#if !HAVE_READDIR_R
469	# define readdir_r aio_readdir_r	866	# define readdir_r aio_readdir_r
470		867
471	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;	868	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
472		869
473	static int
474	readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)	870	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
475	{	871	{
476	struct dirent *e;	872	struct dirent *e;
477	int errorno;	873	int errorno;
478		874
479	pthread_mutex_lock (&readdirlock);	875	LOCK (readdirlock);
480		876
481	e = readdir (dirp);	877	e = readdir (dirp);
482	errorno = errno;	878	errorno = errno;
483		879
484	if (e)	880	if (e)
…		…
487	strcpy (ent->d_name, e->d_name);	883	strcpy (ent->d_name, e->d_name);
488	}	884	}
489	else	885	else
490	*res = 0;	886	*res = 0;
491		887
492	pthread_mutex_unlock (&readdirlock);	888	UNLOCK (readdirlock);
493		889
494	errno = errorno;	890	errno = errorno;
495	return e ? 0 : -1;	891	return e ? 0 : -1;
496	}	892	}
497	#endif	893	#endif
498		894
499	/* sendfile always needs emulation */	895	/* sendfile always needs emulation */
500	static ssize_t
501	sendfile_ (int ofd, int ifd, off_t offset, size_t count)	896	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
502	{	897	{
503	ssize_t res;	898	ssize_t res;
504		899
505	if (!count)	900	if (!count)
506	return 0;	901	return 0;
…		…
517	{	912	{
518	off_t sbytes;	913	off_t sbytes;
519	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	914	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
520		915
521	if (res < 0 && sbytes)	916	if (res < 0 && sbytes)
522	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	917	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
523	res = sbytes;	918	res = sbytes;
524	}	919	}
525		920
526	# elif __hpux	921	# elif __hpux
527	res = sendfile (ofd, ifd, offset, count, 0, 0);	922	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
555	#endif	950	#endif
556	)	951	)
557	)	952	)
558	{	953	{
559	/* emulate sendfile. this is a major pain in the ass */	954	/* emulate sendfile. this is a major pain in the ass */
560	char buf[4096];	955	dBUF;
		956
561	res = 0;	957	res = 0;
562		958
563	while (count)	959	while (count)
564	{	960	{
565	ssize_t cnt;	961	ssize_t cnt;
566		962
567	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	963	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
568		964
569	if (cnt <= 0)	965	if (cnt <= 0)
570	{	966	{
571	if (cnt && !res) res = -1;	967	if (cnt && !res) res = -1;
572	break;	968	break;
573	}	969	}
574		970
575	cnt = write (ofd, buf, cnt);	971	cnt = write (ofd, aio_buf, cnt);
576		972
577	if (cnt <= 0)	973	if (cnt <= 0)
578	{	974	{
579	if (cnt && !res) res = -1;	975	if (cnt && !res) res = -1;
580	break;	976	break;
…		…
588		984
589	return res;	985	return res;
590	}	986	}
591		987
592	/* read a full directory */	988	/* read a full directory */
593	static int	989	static void scandir_ (aio_req req, worker *self)
594	scandir_ (const char *path, void **namesp)
595	{	990	{
596	DIR *dirp = opendir (path);	991	DIR *dirp;
597	union	992	union
598	{	993	{
599	struct dirent d;	994	struct dirent d;
600	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	995	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
601	} u;	996	} *u;
602	struct dirent *entp;	997	struct dirent *entp;
603	char *name, *names;	998	char *name, *names;
604	int memlen = 4096;	999	int memlen = 4096;
605	int memofs = 0;	1000	int memofs = 0;
606	int res = 0;	1001	int res = 0;
607	int errorno;	1002	int errorno;
608		1003
609	if (!dirp)	1004	LOCK (wrklock);
610	return -1;	1005	self->dirp = dirp = opendir (req->ptr1);
611		1006	self->dbuf = u = malloc (sizeof (*u));
		1007	req->flags |= FLAG_PTR2_FREE;
612	names = malloc (memlen);	1008	req->ptr2 = names = malloc (memlen);
		1009	UNLOCK (wrklock);
		1010
		1011	if (dirp && u && names)
		1012	for (;;)
		1013	{
		1014	errno = 0;
		1015	readdir_r (dirp, &u->d, &entp);
		1016
		1017	if (!entp)
		1018	break;
		1019
		1020	name = entp->d_name;
		1021
		1022	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1023	{
		1024	int len = strlen (name) + 1;
		1025
		1026	res++;
		1027
		1028	while (memofs + len > memlen)
		1029	{
		1030	memlen *= 2;
		1031	LOCK (wrklock);
		1032	req->ptr2 = names = realloc (names, memlen);
		1033	UNLOCK (wrklock);
		1034
		1035	if (!names)
		1036	break;
		1037	}
		1038
		1039	memcpy (names + memofs, name, len);
		1040	memofs += len;
		1041	}
		1042	}
		1043
		1044	if (errno)
		1045	res = -1;
		1046
		1047	req->result = res;
		1048	}
		1049
		1050	/*****************************************************************************/
		1051
		1052	static void *aio_proc (void *thr_arg)
		1053	{
		1054	aio_req req;
		1055	struct timespec ts;
		1056	worker *self = (worker *)thr_arg;
		1057
		1058	/* try to distribute timeouts somewhat evenly */
		1059	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1060	* (1000000000UL / 1024UL);
613		1061
614	for (;;)	1062	for (;;)
615	{	1063	{
616	errno = 0, readdir_r (dirp, &u.d, &entp);	1064	ts.tv_sec = time (0) + IDLE_TIMEOUT;
617		1065
618	if (!entp)	1066	LOCK (reqlock);
619	break;
620
621	name = entp->d_name;
622
623	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
624	{
625	int len = strlen (name) + 1;
626
627	res++;
628
629	while (memofs + len > memlen)
630	{
631	memlen *= 2;
632	names = realloc (names, memlen);
633	if (!names)
634	break;
635	}
636
637	memcpy (names + memofs, name, len);
638	memofs += len;
639	}
640	}
641
642	errorno = errno;
643	closedir (dirp);
644
645	if (errorno)
646	{
647	free (names);
648	errno = errorno;
649	res = -1;
650	}
651
652	*namesp = (void *)names;
653	return res;
654	}
655
656	/*****************************************************************************/
657
658	static void *
659	aio_proc (void *thr_arg)
660	{
661	aio_req req;
662	int type;
663
664	do
665	{
666	pthread_mutex_lock (&reqlock);
667		1067
668	for (;;)	1068	for (;;)
669	{	1069	{
670	req = reqs;	1070	self->req = req = reqq_shift (&req_queue);
671
672	if (reqs)
673	{
674	reqs = reqs->next;
675	if (!reqs) reqe = 0;
676	}
677		1071
678	if (req)	1072	if (req)
679	break;	1073	break;
680		1074
		1075	++idle;
		1076
		1077	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1078	== ETIMEDOUT)
		1079	{
		1080	if (idle > max_idle)
		1081	{
		1082	--idle;
		1083	UNLOCK (reqlock);
		1084	LOCK (wrklock);
		1085	--started;
		1086	UNLOCK (wrklock);
		1087	goto quit;
		1088	}
		1089
		1090	/* we are allowed to idle, so do so without any timeout */
681	pthread_cond_wait (&reqwait, &reqlock);	1091	pthread_cond_wait (&reqwait, &reqlock);
		1092	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1093	}
		1094
		1095	--idle;
682	}	1096	}
683		1097
684	pthread_mutex_unlock (&reqlock);	1098	--nready;
		1099
		1100	UNLOCK (reqlock);
685		1101
686	errno = 0; /* strictly unnecessary */	1102	errno = 0; /* strictly unnecessary */
687		1103
688	if (!req->cancelled)	1104	if (!(req->flags & FLAG_CANCELLED))
689	switch (req->type)	1105	switch (req->type)
690	{	1106	{
691	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	1107	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
692	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	1108	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
693		1109
694	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	1110	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
695	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;	1111	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
696		1112
697	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1113	case REQ_STAT: req->result = stat (req->ptr1, (Stat_t *)req->ptr2); break;
698	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1114	case REQ_LSTAT: req->result = lstat (req->ptr1, (Stat_t *)req->ptr2); break;
699	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1115	case REQ_FSTAT: req->result = fstat (req->int1, (Stat_t *)req->ptr2); break;
700		1116
701	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	1117	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
702	case REQ_CLOSE: req->result = close (req->fd); break;	1118	case REQ_CLOSE: req->result = close (req->int1); break;
703	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1119	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
704	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1120	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
705	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;	1121	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
706	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;	1122	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
707	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	1123	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1124	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1125	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
708		1126
709	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1127	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
710	case REQ_FSYNC: req->result = fsync (req->fd); break;	1128	case REQ_FSYNC: req->result = fsync (req->int1); break;
711	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;	1129	case REQ_READDIR: scandir_ (req, self); break;
		1130
		1131	case REQ_BUSY:
		1132	{
		1133	struct timeval tv;
		1134
		1135	tv.tv_sec = req->int1;
		1136	tv.tv_usec = req->int2;
		1137
		1138	req->result = select (0, 0, 0, 0, &tv);
		1139	}
		1140
		1141	case REQ_GROUP:
		1142	case REQ_NOP:
		1143	break;
712		1144
713	case REQ_QUIT:	1145	case REQ_QUIT:
714	break;	1146	goto quit;
715		1147
716	default:	1148	default:
717	req->result = ENOSYS;	1149	req->result = ENOSYS;
718	break;	1150	break;
719	}	1151	}
720		1152
721	req->errorno = errno;	1153	req->errorno = errno;
722		1154
723	pthread_mutex_lock (&reslock);	1155	LOCK (reslock);
724		1156
725	req->next = 0;	1157	++npending;
726		1158
727	if (rese)	1159	if (!reqq_push (&res_queue, req))
728	{
729	rese->next = req;
730	rese = req;
731	}
732	else
733	{
734	rese = ress = req;
735
736	/* write a dummy byte to the pipe so fh becomes ready */	1160	/* write a dummy byte to the pipe so fh becomes ready */
737	write (respipe [1], &respipe, 1);	1161	write (respipe [1], &respipe, 1);
738	}
739		1162
740	pthread_mutex_unlock (&reslock);	1163	self->req = 0;
		1164	worker_clear (self);
		1165
		1166	UNLOCK (reslock);
741	}	1167	}
742	while (type != REQ_QUIT);	1168
		1169	quit:
		1170	LOCK (wrklock);
		1171	worker_free (self);
		1172	UNLOCK (wrklock);
743		1173
744	return 0;	1174	return 0;
745	}	1175	}
746		1176
747	/*****************************************************************************/	1177	/*****************************************************************************/
748		1178
749	static void atfork_prepare (void)	1179	static void atfork_prepare (void)
750	{	1180	{
751	pthread_mutex_lock (&reqlock);	1181	LOCK (wrklock);
752	pthread_mutex_lock (&reslock);	1182	LOCK (reqlock);
		1183	LOCK (reslock);
753	#if !HAVE_PREADWRITE	1184	#if !HAVE_PREADWRITE
754	pthread_mutex_lock (&preadwritelock);	1185	LOCK (preadwritelock);
755	#endif	1186	#endif
756	#if !HAVE_READDIR_R	1187	#if !HAVE_READDIR_R
757	pthread_mutex_lock (&readdirlock);	1188	LOCK (readdirlock);
758	#endif	1189	#endif
759	}	1190	}
760		1191
761	static void atfork_parent (void)	1192	static void atfork_parent (void)
762	{	1193	{
763	#if !HAVE_READDIR_R	1194	#if !HAVE_READDIR_R
764	pthread_mutex_unlock (&readdirlock);	1195	UNLOCK (readdirlock);
765	#endif	1196	#endif
766	#if !HAVE_PREADWRITE	1197	#if !HAVE_PREADWRITE
767	pthread_mutex_unlock (&preadwritelock);	1198	UNLOCK (preadwritelock);
768	#endif	1199	#endif
769	pthread_mutex_unlock (&reslock);	1200	UNLOCK (reslock);
770	pthread_mutex_unlock (&reqlock);	1201	UNLOCK (reqlock);
		1202	UNLOCK (wrklock);
771	}	1203	}
772		1204
773	static void atfork_child (void)	1205	static void atfork_child (void)
774	{	1206	{
775	aio_req prv;	1207	aio_req prv;
776		1208
777	started = 0;	1209	while (prv = reqq_shift (&req_queue))
		1210	req_free (prv);
778		1211
779	while (reqs)	1212	while (prv = reqq_shift (&res_queue))
		1213	req_free (prv);
		1214
		1215	while (wrk_first.next != &wrk_first)
780	{	1216	{
781	prv = reqs;	1217	worker *wrk = wrk_first.next;
782	reqs = prv->next;	1218
		1219	if (wrk->req)
		1220	req_free (wrk->req);
		1221
		1222	worker_clear (wrk);
783	req_free (prv);	1223	worker_free (wrk);
784	}	1224	}
785		1225
786	reqs = reqe = 0;	1226	started = 0;
787		1227	idle = 0;
788	while (ress)	1228	nreqs = 0;
789	{	1229	nready = 0;
790	prv = ress;	1230	npending = 0;
791	ress = prv->next;
792	req_free (prv);
793	}
794
795	ress = rese = 0;
796		1231
797	close (respipe [0]);	1232	close (respipe [0]);
798	close (respipe [1]);	1233	close (respipe [1]);
799	create_pipe ();	1234	create_pipe ();
800		1235
801	atfork_parent ();	1236	atfork_parent ();
802	}	1237	}
803		1238
804	#define dREQ \	1239	#define dREQ \
805	aio_req req; \	1240	aio_req req; \
		1241	int req_pri = next_pri; \
		1242	next_pri = DEFAULT_PRI + PRI_BIAS; \
806	\	1243	\
807	if (SvOK (callback) && !SvROK (callback)) \	1244	if (SvOK (callback) && !SvROK (callback)) \
808	croak ("callback must be undef or of reference type"); \	1245	croak ("callback must be undef or of reference type"); \
809	\	1246	\
810	Newz (0, req, 1, aio_cb); \	1247	Newz (0, req, 1, aio_cb); \
811	if (!req) \	1248	if (!req) \
812	croak ("out of memory during aio_req allocation"); \	1249	croak ("out of memory during aio_req allocation"); \
813	\	1250	\
814	req->callback = newSVsv (callback)	1251	req->callback = newSVsv (callback); \
		1252	req->pri = req_pri
815		1253
816	#define REQ_SEND \	1254	#define REQ_SEND \
817	req_send (req); \	1255	req_send (req); \
818	\	1256	\
819	if (GIMME_V != G_VOID) \	1257	if (GIMME_V != G_VOID) \
…		…
824	PROTOTYPES: ENABLE	1262	PROTOTYPES: ENABLE
825		1263
826	BOOT:	1264	BOOT:
827	{	1265	{
828	HV *stash = gv_stashpv ("IO::AIO", 1);	1266	HV *stash = gv_stashpv ("IO::AIO", 1);
		1267
829	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));	1268	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
830	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));	1269	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
831	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));	1270	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1271	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1272	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1273	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
832		1274
833	create_pipe ();	1275	create_pipe ();
834	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1276	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
835	}	1277	}
836		1278
837	void	1279	void
838	min_parallel (nthreads)	1280	max_poll_reqs (int nreqs)
839	int nthreads
840	PROTOTYPE: $	1281	PROTOTYPE: $
		1282	CODE:
		1283	max_poll_reqs = nreqs;
841		1284
842	void	1285	void
843	max_parallel (nthreads)	1286	max_poll_time (double nseconds)
844	int nthreads
845	PROTOTYPE: $	1287	PROTOTYPE: $
		1288	CODE:
		1289	max_poll_time = nseconds * AIO_TICKS;
		1290
		1291	void
		1292	min_parallel (int nthreads)
		1293	PROTOTYPE: $
		1294
		1295	void
		1296	max_parallel (int nthreads)
		1297	PROTOTYPE: $
		1298
		1299	void
		1300	max_idle (int nthreads)
		1301	PROTOTYPE: $
		1302	CODE:
		1303	set_max_idle (nthreads);
846		1304
847	int	1305	int
848	max_outstanding (nreqs)	1306	max_outstanding (int maxreqs)
849	int nreqs	1307	PROTOTYPE: $
850	PROTOTYPE: $
851	CODE:	1308	CODE:
852	RETVAL = max_outstanding;	1309	RETVAL = max_outstanding;
853	max_outstanding = nreqs;	1310	max_outstanding = maxreqs;
		1311	OUTPUT:
		1312	RETVAL
854		1313
855	void	1314	void
856	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	1315	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
857	SV * pathname	1316	SV8 * pathname
858	int flags	1317	int flags
859	int mode	1318	int mode
860	SV * callback	1319	SV * callback
861	PROTOTYPE: $$$;$	1320	PROTOTYPE: $$$;$
862	PPCODE:	1321	PPCODE:
863	{	1322	{
864	dREQ;	1323	dREQ;
865		1324
866	req->type = REQ_OPEN;	1325	req->type = REQ_OPEN;
867	req->data = newSVsv (pathname);	1326	req->sv1 = newSVsv (pathname);
868	req->dataptr = SvPVbyte_nolen (req->data);	1327	req->ptr1 = SvPVbyte_nolen (req->sv1);
869	req->fd = flags;	1328	req->int1 = flags;
870	req->mode = mode;	1329	req->mode = mode;
871		1330
872	REQ_SEND;	1331	REQ_SEND;
873	}	1332	}
874		1333
…		…
884	PPCODE:	1343	PPCODE:
885	{	1344	{
886	dREQ;	1345	dREQ;
887		1346
888	req->type = ix;	1347	req->type = ix;
889	req->fh = newSVsv (fh);	1348	req->fh = newSVsv (fh);
890	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1349	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
891		1350
892	REQ_SEND (req);	1351	REQ_SEND (req);
893	}	1352	}
894		1353
895	void	1354	void
896	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1355	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
897	SV * fh	1356	SV * fh
898	UV offset	1357	UV offset
899	UV length	1358	UV length
900	SV * data	1359	SV8 * data
901	UV dataoffset	1360	UV dataoffset
902	SV * callback	1361	SV * callback
903	ALIAS:	1362	ALIAS:
904	aio_read = REQ_READ	1363	aio_read = REQ_READ
905	aio_write = REQ_WRITE	1364	aio_write = REQ_WRITE
906	PROTOTYPE: $$$$$;$	1365	PROTOTYPE: $$$$$;$
907	PPCODE:	1366	PPCODE:
908	{	1367	{
909	aio_req req;
910	STRLEN svlen;	1368	STRLEN svlen;
911	char *svptr = SvPVbyte (data, svlen);	1369	char *svptr = SvPVbyte (data, svlen);
912		1370
913	SvUPGRADE (data, SVt_PV);	1371	SvUPGRADE (data, SVt_PV);
914	SvPOK_on (data);	1372	SvPOK_on (data);
…		…
936		1394
937	{	1395	{
938	dREQ;	1396	dREQ;
939		1397
940	req->type = ix;	1398	req->type = ix;
941	req->fh = newSVsv (fh);	1399	req->fh = newSVsv (fh);
942	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1400	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
943	: IoOFP (sv_2io (fh)));	1401	: IoOFP (sv_2io (fh)));
944	req->offset = offset;	1402	req->offs = offset;
945	req->length = length;	1403	req->size = length;
946	req->data = SvREFCNT_inc (data);	1404	req->sv1 = SvREFCNT_inc (data);
947	req->dataptr = (char *)svptr + dataoffset;	1405	req->ptr1 = (char *)svptr + dataoffset;
		1406	req->stroffset = dataoffset;
948		1407
949	if (!SvREADONLY (data))	1408	if (!SvREADONLY (data))
950	{	1409	{
951	SvREADONLY_on (data);	1410	SvREADONLY_on (data);
952	req->data2ptr = (void *)data;	1411	req->flags |= FLAG_SV1_RO_OFF;
953	}	1412	}
954		1413
955	REQ_SEND;	1414	REQ_SEND;
956	}	1415	}
		1416	}
		1417
		1418	void
		1419	aio_readlink (path,callback=&PL_sv_undef)
		1420	SV8 * path
		1421	SV * callback
		1422	PROTOTYPE: $$;$
		1423	PPCODE:
		1424	{
		1425	SV *data;
		1426	dREQ;
		1427
		1428	data = newSV (NAME_MAX);
		1429	SvPOK_on (data);
		1430
		1431	req->type = REQ_READLINK;
		1432	req->fh = newSVsv (path);
		1433	req->ptr2 = SvPVbyte_nolen (req->fh);
		1434	req->sv1 = data;
		1435	req->ptr1 = SvPVbyte_nolen (data);
		1436
		1437	REQ_SEND;
957	}	1438	}
958		1439
959	void	1440	void
960	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	1441	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
961	SV * out_fh	1442	SV * out_fh
…		…
967	PPCODE:	1448	PPCODE:
968	{	1449	{
969	dREQ;	1450	dREQ;
970		1451
971	req->type = REQ_SENDFILE;	1452	req->type = REQ_SENDFILE;
972	req->fh = newSVsv (out_fh);	1453	req->fh = newSVsv (out_fh);
973	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1454	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
974	req->fh2 = newSVsv (in_fh);	1455	req->sv2 = newSVsv (in_fh);
975	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1456	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
976	req->offset = in_offset;	1457	req->offs = in_offset;
977	req->length = length;	1458	req->size = length;
978		1459
979	REQ_SEND;	1460	REQ_SEND;
980	}	1461	}
981		1462
982	void	1463	void
…		…
989	PPCODE:	1470	PPCODE:
990	{	1471	{
991	dREQ;	1472	dREQ;
992		1473
993	req->type = REQ_READAHEAD;	1474	req->type = REQ_READAHEAD;
994	req->fh = newSVsv (fh);	1475	req->fh = newSVsv (fh);
995	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1476	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
996	req->offset = offset;	1477	req->offs = offset;
997	req->length = length;	1478	req->size = length;
998		1479
999	REQ_SEND;	1480	REQ_SEND;
1000	}	1481	}
1001		1482
1002	void	1483	void
1003	aio_stat (fh_or_path,callback=&PL_sv_undef)	1484	aio_stat (fh_or_path,callback=&PL_sv_undef)
1004	SV * fh_or_path	1485	SV8 * fh_or_path
1005	SV * callback	1486	SV * callback
1006	ALIAS:	1487	ALIAS:
1007	aio_stat = REQ_STAT	1488	aio_stat = REQ_STAT
1008	aio_lstat = REQ_LSTAT	1489	aio_lstat = REQ_LSTAT
1009	PPCODE:	1490	PPCODE:
1010	{	1491	{
1011	dREQ;	1492	dREQ;
1012		1493
1013	New (0, req->statdata, 1, Stat_t);	1494	req->ptr2 = malloc (sizeof (Stat_t));
1014	if (!req->statdata)	1495	if (!req->ptr2)
1015	{	1496	{
1016	req_free (req);	1497	req_free (req);
1017	croak ("out of memory during aio_req->statdata allocation");	1498	croak ("out of memory during aio_stat statdata allocation");
1018	}	1499	}
		1500
		1501	req->flags |= FLAG_PTR2_FREE;
1019		1502
1020	if (SvPOK (fh_or_path))	1503	if (SvPOK (fh_or_path))
1021	{	1504	{
1022	req->type = ix;	1505	req->type = ix;
1023	req->data = newSVsv (fh_or_path);	1506	req->sv1 = newSVsv (fh_or_path);
1024	req->dataptr = SvPVbyte_nolen (req->data);	1507	req->ptr1 = SvPVbyte_nolen (req->sv1);
1025	}	1508	}
1026	else	1509	else
1027	{	1510	{
1028	req->type = REQ_FSTAT;	1511	req->type = REQ_FSTAT;
1029	req->fh = newSVsv (fh_or_path);	1512	req->fh = newSVsv (fh_or_path);
1030	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1513	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1031	}	1514	}
1032		1515
1033	REQ_SEND;	1516	REQ_SEND;
1034	}	1517	}
1035		1518
1036	void	1519	void
1037	aio_unlink (pathname,callback=&PL_sv_undef)	1520	aio_unlink (pathname,callback=&PL_sv_undef)
1038	SV * pathname	1521	SV8 * pathname
1039	SV * callback	1522	SV * callback
1040	ALIAS:	1523	ALIAS:
1041	aio_unlink = REQ_UNLINK	1524	aio_unlink = REQ_UNLINK
1042	aio_rmdir = REQ_RMDIR	1525	aio_rmdir = REQ_RMDIR
1043	aio_readdir = REQ_READDIR	1526	aio_readdir = REQ_READDIR
1044	PPCODE:	1527	PPCODE:
1045	{	1528	{
1046	dREQ;	1529	dREQ;
1047		1530
1048	req->type = ix;	1531	req->type = ix;
1049	req->data = newSVsv (pathname);	1532	req->sv1 = newSVsv (pathname);
1050	req->dataptr = SvPVbyte_nolen (req->data);	1533	req->ptr1 = SvPVbyte_nolen (req->sv1);
1051		1534
1052	REQ_SEND;	1535	REQ_SEND;
1053	}	1536	}
1054		1537
1055	void	1538	void
1056	aio_link (oldpath,newpath,callback=&PL_sv_undef)	1539	aio_link (oldpath,newpath,callback=&PL_sv_undef)
1057	SV * oldpath	1540	SV8 * oldpath
1058	SV * newpath	1541	SV8 * newpath
1059	SV * callback	1542	SV * callback
1060	ALIAS:	1543	ALIAS:
1061	aio_link = REQ_LINK	1544	aio_link = REQ_LINK
1062	aio_symlink = REQ_SYMLINK	1545	aio_symlink = REQ_SYMLINK
1063	aio_rename = REQ_RENAME	1546	aio_rename = REQ_RENAME
1064	PPCODE:	1547	PPCODE:
1065	{	1548	{
1066	dREQ;	1549	dREQ;
1067		1550
1068	req->type = ix;	1551	req->type = ix;
1069	req->fh = newSVsv (oldpath);	1552	req->fh = newSVsv (oldpath);
1070	req->data2ptr = SvPVbyte_nolen (req->fh);	1553	req->ptr2 = SvPVbyte_nolen (req->fh);
1071	req->data = newSVsv (newpath);	1554	req->sv1 = newSVsv (newpath);
1072	req->dataptr = SvPVbyte_nolen (req->data);	1555	req->ptr1 = SvPVbyte_nolen (req->sv1);
1073		1556
1074	REQ_SEND;	1557	REQ_SEND;
1075	}	1558	}
1076		1559
1077	void	1560	void
		1561	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
		1562	SV8 * pathname
		1563	SV * callback
		1564	UV mode
		1565	UV dev
		1566	PPCODE:
		1567	{
		1568	dREQ;
		1569
		1570	req->type = REQ_MKNOD;
		1571	req->sv1 = newSVsv (pathname);
		1572	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1573	req->mode = (mode_t)mode;
		1574	req->offs = dev;
		1575
		1576	REQ_SEND;
		1577	}
		1578
		1579	void
		1580	aio_busy (delay,callback=&PL_sv_undef)
		1581	double delay
		1582	SV * callback
		1583	PPCODE:
		1584	{
		1585	dREQ;
		1586
		1587	req->type = REQ_BUSY;
		1588	req->int1 = delay < 0. ? 0 : delay;
		1589	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
		1590
		1591	REQ_SEND;
		1592	}
		1593
		1594	void
1078	aio_group (callback=&PL_sv_undef)	1595	aio_group (callback=&PL_sv_undef)
1079	SV * callback	1596	SV * callback
1080	PROTOTYPE: ;&	1597	PROTOTYPE: ;$
1081	PPCODE:	1598	PPCODE:
1082	{	1599	{
1083	dREQ;	1600	dREQ;
		1601
1084	req->type = REQ_GROUP;	1602	req->type = REQ_GROUP;
		1603
		1604	req_send (req);
1085	XPUSHs (req_sv (req, AIO_GRP_KLASS));	1605	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1086	}	1606	}
		1607
		1608	void
		1609	aio_nop (callback=&PL_sv_undef)
		1610	SV * callback
		1611	PPCODE:
		1612	{
		1613	dREQ;
		1614
		1615	req->type = REQ_NOP;
		1616
		1617	REQ_SEND;
		1618	}
		1619
		1620	int
		1621	aioreq_pri (int pri = 0)
		1622	PROTOTYPE: ;$
		1623	CODE:
		1624	RETVAL = next_pri - PRI_BIAS;
		1625	if (items > 0)
		1626	{
		1627	if (pri < PRI_MIN) pri = PRI_MIN;
		1628	if (pri > PRI_MAX) pri = PRI_MAX;
		1629	next_pri = pri + PRI_BIAS;
		1630	}
		1631	OUTPUT:
		1632	RETVAL
		1633
		1634	void
		1635	aioreq_nice (int nice = 0)
		1636	CODE:
		1637	nice = next_pri - nice;
		1638	if (nice < PRI_MIN) nice = PRI_MIN;
		1639	if (nice > PRI_MAX) nice = PRI_MAX;
		1640	next_pri = nice + PRI_BIAS;
1087		1641
1088	void	1642	void
1089	flush ()	1643	flush ()
1090	PROTOTYPE:	1644	PROTOTYPE:
1091	CODE:	1645	CODE:
1092	while (nreqs)	1646	while (nreqs)
1093	{	1647	{
1094	poll_wait ();	1648	poll_wait ();
1095	poll_cb ();	1649	poll_cb (0);
1096	}	1650	}
1097		1651
1098	void	1652	void
1099	poll()	1653	poll()
1100	PROTOTYPE:	1654	PROTOTYPE:
1101	CODE:	1655	CODE:
1102	if (nreqs)	1656	if (nreqs)
1103	{	1657	{
1104	poll_wait ();	1658	poll_wait ();
1105	poll_cb ();	1659	poll_cb (0);
1106	}	1660	}
1107		1661
1108	int	1662	int
1109	poll_fileno()	1663	poll_fileno()
1110	PROTOTYPE:	1664	PROTOTYPE:
…		…
1134	CODE:	1688	CODE:
1135	RETVAL = nreqs;	1689	RETVAL = nreqs;
1136	OUTPUT:	1690	OUTPUT:
1137	RETVAL	1691	RETVAL
1138		1692
1139	MODULE = IO::AIO PACKAGE = IO::AIO::REQ	1693	int
1140		1694	nready()
1141	void
1142	cancel (aio_req_ornot req)
1143	PROTOTYPE:	1695	PROTOTYPE:
1144	CODE:	1696	CODE:
1145	req->cancelled = 1;	1697	RETVAL = get_nready ();
		1698	OUTPUT:
		1699	RETVAL
1146		1700
		1701	int
		1702	npending()
		1703	PROTOTYPE:
		1704	CODE:
		1705	RETVAL = get_npending ();
		1706	OUTPUT:
		1707	RETVAL
		1708
		1709	int
		1710	nthreads()
		1711	PROTOTYPE:
		1712	CODE:
		1713	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1714	RETVAL = started;
		1715	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1716	OUTPUT:
		1717	RETVAL
		1718
		1719	PROTOTYPES: DISABLE
		1720
		1721	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1722
		1723	void
		1724	cancel (aio_req_ornot req)
		1725	CODE:
		1726	req_cancel (req);
		1727
		1728	void
		1729	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1730	CODE:
		1731	SvREFCNT_dec (req->callback);
		1732	req->callback = newSVsv (callback);
		1733
		1734	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1735
		1736	void
		1737	add (aio_req grp, ...)
		1738	PPCODE:
		1739	{
		1740	int i;
		1741	aio_req req;
		1742
		1743	if (grp->int1 == 2)
		1744	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1745
		1746	for (i = 1; i < items; ++i )
		1747	{
		1748	if (GIMME_V != G_VOID)
		1749	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1750
		1751	req = SvAIO_REQ (ST (i));
		1752
		1753	if (req)
		1754	{
		1755	++grp->size;
		1756	req->grp = grp;
		1757
		1758	req->grp_prev = 0;
		1759	req->grp_next = grp->grp_first;
		1760
		1761	if (grp->grp_first)
		1762	grp->grp_first->grp_prev = req;
		1763
		1764	grp->grp_first = req;
		1765	}
		1766	}
		1767	}
		1768
		1769	void
		1770	cancel_subs (aio_req_ornot req)
		1771	CODE:
		1772	req_cancel_subs (req);
		1773
		1774	void
		1775	result (aio_req grp, ...)
		1776	CODE:
		1777	{
		1778	int i;
		1779	AV *av;
		1780
		1781	grp->errorno = errno;
		1782
		1783	av = newAV ();
		1784
		1785	for (i = 1; i < items; ++i )
		1786	av_push (av, newSVsv (ST (i)));
		1787
		1788	SvREFCNT_dec (grp->sv1);
		1789	grp->sv1 = (SV *)av;
		1790	}
		1791
		1792	void
		1793	errno (aio_req grp, int errorno = errno)
		1794	CODE:
		1795	grp->errorno = errorno;
		1796
		1797	void
		1798	limit (aio_req grp, int limit)
		1799	CODE:
		1800	grp->int2 = limit;
		1801	aio_grp_feed (grp);
		1802
		1803	void
		1804	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1805	CODE:
		1806	{
		1807	SvREFCNT_dec (grp->sv2);
		1808	grp->sv2 = newSVsv (callback);
		1809
		1810	if (grp->int2 <= 0)
		1811	grp->int2 = 2;
		1812
		1813	aio_grp_feed (grp);
		1814	}
		1815

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