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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.42 by root, Fri Jul 21 07:35:31 2006 UTC vs.
Revision 1.92 by root, Wed Nov 8 01:59:59 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,
		104	REQ_GROUP, REQ_NOP,
		105	REQ_BUSY,
58	};	106	};
59		107
		108	#define AIO_REQ_KLASS "IO::AIO::REQ"
		109	#define AIO_GRP_KLASS "IO::AIO::GRP"
		110
60	typedef struct aio_cb {	111	typedef struct aio_cb
		112	{
61	struct aio_cb *volatile next;	113	struct aio_cb *volatile next;
62		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;
63	int type;	123	int type;
64		124	int int1, int2;
65	/* should receive a cleanup, with unions */	125	int errorno;
66	int fd, fd2;
67	off_t offset;
68	size_t length;
69	ssize_t result;
70	mode_t mode; /* open */	126	mode_t mode; /* open */
71	int errorno;
72	SV *data, *callback;
73	SV *fh, *fh2;
74	void *dataptr, *data2ptr;
75	STRLEN dataoffset;
76		127
77	Stat_t *statdata;	128	unsigned char flags;
		129	unsigned char pri;
		130
		131	SV *self; /* the perl counterpart of this request, if any */
		132	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
78	} aio_cb;	133	} aio_cb;
79		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	};
		140
80	typedef aio_cb *aio_req;	141	typedef aio_cb *aio_req;
		142	typedef aio_cb *aio_req_ornot;
81		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
82	static int started, wanted;	167	static unsigned int started, idle, wanted;
83	static volatile int nreqs;	168
84	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;
85	static int respipe [2];	221	static int respipe [2];
86		222
87	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	223	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
88	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	224	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
89	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	225	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
90		226
91	static volatile aio_req reqs, reqe; /* queue start, queue end */	227	#if WORDACCESS_UNSAFE
92	static volatile aio_req ress, rese; /* queue start, queue end */
93		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);
		328
		329	/* must be called at most once */
		330	static SV *req_sv (aio_req req, const char *klass)
		331	{
		332	if (!req->self)
		333	{
		334	req->self = (SV *)newHV ();
		335	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		336	}
		337
		338	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		339	}
		340
		341	static aio_req SvAIO_REQ (SV *sv)
		342	{
		343	MAGIC *mg;
		344
		345	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		346	croak ("object of class " AIO_REQ_KLASS " expected");
		347
		348	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		349
		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	}
		535	}
		536
94	static void free_req (aio_req req)	537	static void req_free (aio_req req)
95	{	538	{
96	if (req->data)
97	SvREFCNT_dec (req->data);
98
99	if (req->fh)	539	if (req->self)
		540	{
		541	sv_unmagic (req->self, PERL_MAGIC_ext);
		542	SvREFCNT_dec (req->self);
		543	}
		544
100	SvREFCNT_dec (req->fh);	545	SvREFCNT_dec (req->fh);
101		546	SvREFCNT_dec (req->sv1);
102	if (req->fh2)
103	SvREFCNT_dec (req->fh2);	547	SvREFCNT_dec (req->sv2);
104
105	if (req->statdata)
106	Safefree (req->statdata);
107
108	if (req->callback)
109	SvREFCNT_dec (req->callback);	548	SvREFCNT_dec (req->callback);
110		549
111	if (req->type == REQ_READDIR && req->result >= 0)	550	if (req->flags & FLAG_PTR2_FREE)
112	free (req->data2ptr);	551	free (req->ptr2);
113		552
114	Safefree (req);	553	Safefree (req);
115	}	554	}
116		555
117	static void	556	static void req_cancel_subs (aio_req grp)
118	poll_wait ()
119	{	557	{
120	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)
121	{	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	{
122	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
123	FD_ZERO(&rfd);	698	FD_ZERO(&rfd);
124	FD_SET(respipe [0], &rfd);	699	FD_SET(respipe [0], &rfd);
125		700
126	select (respipe [0] + 1, &rfd, 0, 0, 0);	701	select (respipe [0] + 1, &rfd, 0, 0, 0);
127	}	702	}
128	}	703	}
129		704
130	static int	705	static int poll_cb ()
131	poll_cb ()
132	{	706	{
133	dSP;	707	dSP;
134	int count = 0;	708	int count = 0;
		709	int maxreqs = max_poll_reqs;
135	int do_croak = 0;	710	int do_croak = 0;
		711	struct timeval tv_start, tv_now;
136	aio_req req;	712	aio_req req;
		713
		714	if (max_poll_time)
		715	gettimeofday (&tv_start, 0);
137		716
138	for (;;)	717	for (;;)
139	{	718	{
140	pthread_mutex_lock (&reslock);	719	for (;;)
141	req = ress;
142
143	if (req)
144	{	720	{
145	ress = req->next;	721	maybe_start_thread ();
146		722
		723	LOCK (reslock);
		724	req = reqq_shift (&res_queue);
		725
147	if (!ress)	726	if (req)
148	{	727	{
		728	--npending;
		729
		730	if (!res_queue.size)
		731	{
149	/* read any signals sent by the worker threads */	732	/* read any signals sent by the worker threads */
150	char buf [32];	733	char buf [32];
151	while (read (respipe [0], buf, 32) == 32)	734	while (read (respipe [0], buf, 32) == 32)
		735	;
152	;	736	}
153
154	rese = 0;
155	}	737	}
156	}
157		738
158	pthread_mutex_unlock (&reslock);	739	UNLOCK (reslock);
159		740
160	if (!req)	741	if (!req)
161	break;	742	break;
162		743
163	nreqs--;	744	--nreqs;
164		745
165	if (req->type == REQ_QUIT)
166	started--;
167	else
168	{
169	int errorno = errno;
170	errno = req->errorno;
171
172	if (req->type == REQ_READ)	746	if (req->type == REQ_GROUP && req->size)
173	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
174
175	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
176	SvREADONLY_off (req->data);
177
178	if (req->statdata)
179	{	747	{
180	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	748	req->int1 = 1; /* mark request as delayed */
181	PL_laststatval = req->result;	749	continue;
182	PL_statcache = *(req->statdata);
183	}
184
185	ENTER;
186	PUSHMARK (SP);
187
188	if (req->type == REQ_READDIR)
189	{
190	SV *rv = &PL_sv_undef;
191
192	if (req->result >= 0)
193	{
194	char *buf = req->data2ptr;
195	AV *av = newAV ();
196
197	while (req->result)
198	{
199	SV *sv = newSVpv (buf, 0);
200
201	av_push (av, sv);
202	buf += SvCUR (sv) + 1;
203	req->result--;
204	}
205
206	rv = sv_2mortal (newRV_noinc ((SV *)av));
207	}
208
209	XPUSHs (rv);
210	}	750	}
211	else	751	else
212	{	752	{
213	XPUSHs (sv_2mortal (newSViv (req->result)));	753	req_invoke (req);
214		754
215	if (req->type == REQ_OPEN)	755	count++;
216	{
217	/* convert fd to fh */
218	SV *fh;
219
220	PUTBACK;
221	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
222	SPAGAIN;
223
224	fh = SvREFCNT_inc (POPs);
225
226	PUSHMARK (SP);
227	XPUSHs (sv_2mortal (fh));
228	}
229	}	756	}
230		757
231	if (SvOK (req->callback))	758	req_free (req);
		759
		760	if (maxreqs && !--maxreqs)
		761	break;
		762
		763	if (max_poll_time)
232	{	764	{
233	PUTBACK;	765	gettimeofday (&tv_now, 0);
234	call_sv (req->callback, G_VOID | G_EVAL);
235	SPAGAIN;
236		766
237	if (SvTRUE (ERRSV))	767	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
238	{	768	break;
239	free_req (req);
240	croak (0);
241	}
242	}	769	}
243
244	LEAVE;
245
246	errno = errorno;
247	count++;
248	}	770	}
249		771
250	free_req (req);	772	if (nreqs <= max_outstanding)
		773	break;
		774
		775	poll_wait ();
		776
		777	++maxreqs;
251	}	778	}
252		779
253	return count;	780	return count;
254	}
255
256	static void *aio_proc(void *arg);
257
258	static void
259	start_thread (void)
260	{
261	sigset_t fullsigset, oldsigset;
262	pthread_t tid;
263	pthread_attr_t attr;
264
265	pthread_attr_init (&attr);
266	pthread_attr_setstacksize (&attr, STACKSIZE);
267	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
268
269	sigfillset (&fullsigset);
270	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
271
272	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
273	started++;
274
275	sigprocmask (SIG_SETMASK, &oldsigset, 0);
276	}
277
278	static void
279	send_req (aio_req req)
280	{
281	while (started < wanted && nreqs >= started)
282	start_thread ();
283
284	nreqs++;
285
286	pthread_mutex_lock (&reqlock);
287
288	req->next = 0;
289
290	if (reqe)
291	{
292	reqe->next = req;
293	reqe = req;
294	}
295	else
296	reqe = reqs = req;
297
298	pthread_cond_signal (&reqwait);
299	pthread_mutex_unlock (&reqlock);
300
301	if (nreqs > max_outstanding)
302	for (;;)
303	{
304	poll_cb ();
305
306	if (nreqs <= max_outstanding)
307	break;
308
309	poll_wait ();
310	}
311	}
312
313	static void
314	end_thread (void)
315	{
316	aio_req req;
317	Newz (0, req, 1, aio_cb);
318	req->type = REQ_QUIT;
319
320	send_req (req);
321	}
322
323	static void min_parallel (int nthreads)
324	{
325	if (wanted < nthreads)
326	wanted = nthreads;
327	}
328
329	static void max_parallel (int nthreads)
330	{
331	int cur = started;
332
333	if (wanted > nthreads)
334	wanted = nthreads;
335
336	while (cur > wanted)
337	{
338	end_thread ();
339	cur--;
340	}
341
342	while (started > wanted)
343	{
344	poll_wait ();
345	poll_cb ();
346	}
347	}	781	}
348		782
349	static void create_pipe ()	783	static void create_pipe ()
350	{	784	{
351	if (pipe (respipe))	785	if (pipe (respipe))
…		…
370	* 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,
371	* but that's your problem, not mine.	805	* but that's your problem, not mine.
372	*/	806	*/
373	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;	807	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
374		808
375	static ssize_t	809	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
376	pread (int fd, void *buf, size_t count, off_t offset)
377	{	810	{
378	ssize_t res;	811	ssize_t res;
379	off_t ooffset;	812	off_t ooffset;
380		813
381	pthread_mutex_lock (&preadwritelock);	814	LOCK (preadwritelock);
382	ooffset = lseek (fd, 0, SEEK_CUR);	815	ooffset = lseek (fd, 0, SEEK_CUR);
383	lseek (fd, offset, SEEK_SET);	816	lseek (fd, offset, SEEK_SET);
384	res = read (fd, buf, count);	817	res = read (fd, buf, count);
385	lseek (fd, ooffset, SEEK_SET);	818	lseek (fd, ooffset, SEEK_SET);
386	pthread_mutex_unlock (&preadwritelock);	819	UNLOCK (preadwritelock);
387		820
388	return res;	821	return res;
389	}	822	}
390		823
391	static ssize_t
392	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)
393	{	825	{
394	ssize_t res;	826	ssize_t res;
395	off_t ooffset;	827	off_t ooffset;
396		828
397	pthread_mutex_lock (&preadwritelock);	829	LOCK (preadwritelock);
398	ooffset = lseek (fd, 0, SEEK_CUR);	830	ooffset = lseek (fd, 0, SEEK_CUR);
399	lseek (fd, offset, SEEK_SET);	831	lseek (fd, offset, SEEK_SET);
400	res = write (fd, buf, count);	832	res = write (fd, buf, count);
401	lseek (fd, offset, SEEK_SET);	833	lseek (fd, offset, SEEK_SET);
402	pthread_mutex_unlock (&preadwritelock);	834	UNLOCK (preadwritelock);
403		835
404	return res;	836	return res;
405	}	837	}
406	#endif	838	#endif
407		839
408	#if !HAVE_FDATASYNC	840	#if !HAVE_FDATASYNC
409	# define fdatasync fsync	841	# define fdatasync fsync
410	#endif	842	#endif
411		843
412	#if !HAVE_READAHEAD	844	#if !HAVE_READAHEAD
413	# define readahead aio_readahead	845	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
414		846
415	static ssize_t	847	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
416	readahead (int fd, off_t offset, size_t count)
417	{	848	{
418	char readahead_buf[4096];	849	dBUF;
419		850
420	while (count > 0)	851	while (count > 0)
421	{	852	{
422	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	853	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
423		854
424	pread (fd, readahead_buf, len, offset);	855	pread (fd, aio_buf, len, offset);
425	offset += len;	856	offset += len;
426	count -= len;	857	count -= len;
427	}	858	}
428		859
429	errno = 0;	860	errno = 0;
430	}	861	}
		862
431	#endif	863	#endif
432		864
433	#if !HAVE_READDIR_R	865	#if !HAVE_READDIR_R
434	# define readdir_r aio_readdir_r	866	# define readdir_r aio_readdir_r
435		867
436	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;	868	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
437		869
438	static int
439	readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)	870	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
440	{	871	{
441	struct dirent *e;	872	struct dirent *e;
442	int errorno;	873	int errorno;
443		874
444	pthread_mutex_lock (&readdirlock);	875	LOCK (readdirlock);
445		876
446	e = readdir (dirp);	877	e = readdir (dirp);
447	errorno = errno;	878	errorno = errno;
448		879
449	if (e)	880	if (e)
…		…
452	strcpy (ent->d_name, e->d_name);	883	strcpy (ent->d_name, e->d_name);
453	}	884	}
454	else	885	else
455	*res = 0;	886	*res = 0;
456		887
457	pthread_mutex_unlock (&readdirlock);	888	UNLOCK (readdirlock);
458		889
459	errno = errorno;	890	errno = errorno;
460	return e ? 0 : -1;	891	return e ? 0 : -1;
461	}	892	}
462	#endif	893	#endif
463		894
464	/* sendfile always needs emulation */	895	/* sendfile always needs emulation */
465	static ssize_t
466	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)
467	{	897	{
468	ssize_t res;	898	ssize_t res;
469		899
470	if (!count)	900	if (!count)
471	return 0;	901	return 0;
…		…
482	{	912	{
483	off_t sbytes;	913	off_t sbytes;
484	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	914	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
485		915
486	if (res < 0 && sbytes)	916	if (res < 0 && sbytes)
487	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	917	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
488	res = sbytes;	918	res = sbytes;
489	}	919	}
490		920
491	# elif __hpux	921	# elif __hpux
492	res = sendfile (ofd, ifd, offset, count, 0, 0);	922	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
520	#endif	950	#endif
521	)	951	)
522	)	952	)
523	{	953	{
524	/* emulate sendfile. this is a major pain in the ass */	954	/* emulate sendfile. this is a major pain in the ass */
525	char buf[4096];	955	dBUF;
		956
526	res = 0;	957	res = 0;
527		958
528	while (count)	959	while (count)
529	{	960	{
530	ssize_t cnt;	961	ssize_t cnt;
531		962
532	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	963	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
533		964
534	if (cnt <= 0)	965	if (cnt <= 0)
535	{	966	{
536	if (cnt && !res) res = -1;	967	if (cnt && !res) res = -1;
537	break;	968	break;
538	}	969	}
539		970
540	cnt = write (ofd, buf, cnt);	971	cnt = write (ofd, aio_buf, cnt);
541		972
542	if (cnt <= 0)	973	if (cnt <= 0)
543	{	974	{
544	if (cnt && !res) res = -1;	975	if (cnt && !res) res = -1;
545	break;	976	break;
…		…
553		984
554	return res;	985	return res;
555	}	986	}
556		987
557	/* read a full directory */	988	/* read a full directory */
558	static int	989	static void scandir_ (aio_req req, worker *self)
559	scandir_ (const char *path, void **namesp)
560	{	990	{
561	DIR *dirp = opendir (path);	991	DIR *dirp;
562	union	992	union
563	{	993	{
564	struct dirent d;	994	struct dirent d;
565	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	995	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
566	} u;	996	} *u;
567	struct dirent *entp;	997	struct dirent *entp;
568	char *name, *names;	998	char *name, *names;
569	int memlen = 4096;	999	int memlen = 4096;
570	int memofs = 0;	1000	int memofs = 0;
571	int res = 0;	1001	int res = 0;
572	int errorno;	1002	int errorno;
573		1003
574	if (!dirp)	1004	LOCK (wrklock);
575	return -1;	1005	self->dirp = dirp = opendir (req->ptr1);
576		1006	self->dbuf = u = malloc (sizeof (*u));
		1007	req->flags |= FLAG_PTR2_FREE;
577	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);
578		1061
579	for (;;)	1062	for (;;)
580	{	1063	{
581	errno = 0, readdir_r (dirp, &u.d, &entp);	1064	ts.tv_sec = time (0) + IDLE_TIMEOUT;
582		1065
583	if (!entp)	1066	LOCK (reqlock);
584	break;
585
586	name = entp->d_name;
587
588	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
589	{
590	int len = strlen (name) + 1;
591
592	res++;
593
594	while (memofs + len > memlen)
595	{
596	memlen *= 2;
597	names = realloc (names, memlen);
598	if (!names)
599	break;
600	}
601
602	memcpy (names + memofs, name, len);
603	memofs += len;
604	}
605	}
606
607	errorno = errno;
608	closedir (dirp);
609
610	if (errorno)
611	{
612	free (names);
613	errno = errorno;
614	res = -1;
615	}
616
617	*namesp = (void *)names;
618	return res;
619	}
620
621	/*****************************************************************************/
622
623	static void *
624	aio_proc (void *thr_arg)
625	{
626	aio_req req;
627	int type;
628
629	do
630	{
631	pthread_mutex_lock (&reqlock);
632		1067
633	for (;;)	1068	for (;;)
634	{	1069	{
635	req = reqs;	1070	self->req = req = reqq_shift (&req_queue);
636
637	if (reqs)
638	{
639	reqs = reqs->next;
640	if (!reqs) reqe = 0;
641	}
642		1071
643	if (req)	1072	if (req)
644	break;	1073	break;
645		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 */
646	pthread_cond_wait (&reqwait, &reqlock);	1091	pthread_cond_wait (&reqwait, &reqlock);
		1092	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1093	}
		1094
		1095	--idle;
647	}	1096	}
648		1097
649	pthread_mutex_unlock (&reqlock);	1098	--nready;
		1099
		1100	UNLOCK (reqlock);
650		1101
651	errno = 0; /* strictly unnecessary */	1102	errno = 0; /* strictly unnecessary */
652		1103
653	type = req->type;	1104	if (!(req->flags & FLAG_CANCELLED))
654
655	switch (type)	1105	switch (req->type)
656	{	1106	{
657	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;
658	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;
659		1109
660	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;
661	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;
662		1112
663	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;
664	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;
665	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;
666		1116
667	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;
668	case REQ_CLOSE: req->result = close (req->fd); break;	1118	case REQ_CLOSE: req->result = close (req->int1); break;
669	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1119	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
670	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1120	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
671	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;	1121	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
672	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;	1122	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
673	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;
674		1126
675	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1127	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
676	case REQ_FSYNC: req->result = fsync (req->fd); break;	1128	case REQ_FSYNC: req->result = fsync (req->int1); break;
677	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;	1129	case REQ_READDIR: scandir_ (req, self); break;
678		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;
		1144
679	case REQ_QUIT:	1145	case REQ_QUIT:
680	break;	1146	goto quit;
681		1147
682	default:	1148	default:
683	req->result = ENOSYS;	1149	req->result = ENOSYS;
684	break;	1150	break;
685	}	1151	}
686		1152
687	req->errorno = errno;	1153	req->errorno = errno;
688		1154
689	pthread_mutex_lock (&reslock);	1155	LOCK (reslock);
690		1156
691	req->next = 0;	1157	++npending;
692		1158
693	if (rese)	1159	if (!reqq_push (&res_queue, req))
694	{
695	rese->next = req;
696	rese = req;
697	}
698	else
699	{
700	rese = ress = req;
701
702	/* write a dummy byte to the pipe so fh becomes ready */	1160	/* write a dummy byte to the pipe so fh becomes ready */
703	write (respipe [1], &respipe, 1);	1161	write (respipe [1], &respipe, 1);
704	}
705		1162
706	pthread_mutex_unlock (&reslock);	1163	self->req = 0;
		1164	worker_clear (self);
		1165
		1166	UNLOCK (reslock);
707	}	1167	}
708	while (type != REQ_QUIT);	1168
		1169	quit:
		1170	LOCK (wrklock);
		1171	worker_free (self);
		1172	UNLOCK (wrklock);
709		1173
710	return 0;	1174	return 0;
711	}	1175	}
712		1176
713	/*****************************************************************************/	1177	/*****************************************************************************/
714		1178
715	static void atfork_prepare (void)	1179	static void atfork_prepare (void)
716	{	1180	{
717	pthread_mutex_lock (&reqlock);	1181	LOCK (wrklock);
718	pthread_mutex_lock (&reslock);	1182	LOCK (reqlock);
		1183	LOCK (reslock);
719	#if !HAVE_PREADWRITE	1184	#if !HAVE_PREADWRITE
720	pthread_mutex_lock (&preadwritelock);	1185	LOCK (preadwritelock);
721	#endif	1186	#endif
722	#if !HAVE_READDIR_R	1187	#if !HAVE_READDIR_R
723	pthread_mutex_lock (&readdirlock);	1188	LOCK (readdirlock);
724	#endif	1189	#endif
725	}	1190	}
726		1191
727	static void atfork_parent (void)	1192	static void atfork_parent (void)
728	{	1193	{
729	#if !HAVE_READDIR_R	1194	#if !HAVE_READDIR_R
730	pthread_mutex_unlock (&readdirlock);	1195	UNLOCK (readdirlock);
731	#endif	1196	#endif
732	#if !HAVE_PREADWRITE	1197	#if !HAVE_PREADWRITE
733	pthread_mutex_unlock (&preadwritelock);	1198	UNLOCK (preadwritelock);
734	#endif	1199	#endif
735	pthread_mutex_unlock (&reslock);	1200	UNLOCK (reslock);
736	pthread_mutex_unlock (&reqlock);	1201	UNLOCK (reqlock);
		1202	UNLOCK (wrklock);
737	}	1203	}
738		1204
739	static void atfork_child (void)	1205	static void atfork_child (void)
740	{	1206	{
741	aio_req prv;	1207	aio_req prv;
742		1208
743	started = 0;	1209	while (prv = reqq_shift (&req_queue))
		1210	req_free (prv);
744		1211
745	while (reqs)	1212	while (prv = reqq_shift (&res_queue))
		1213	req_free (prv);
		1214
		1215	while (wrk_first.next != &wrk_first)
746	{	1216	{
747	prv = reqs;	1217	worker *wrk = wrk_first.next;
748	reqs = prv->next;	1218
749	free_req (prv);	1219	if (wrk->req)
		1220	req_free (wrk->req);
		1221
		1222	worker_clear (wrk);
		1223	worker_free (wrk);
750	}	1224	}
751		1225
752	reqs = reqe = 0;	1226	started = 0;
753		1227	idle = 0;
754	while (ress)	1228	nreqs = 0;
755	{	1229	nready = 0;
756	prv = ress;	1230	npending = 0;
757	ress = prv->next;
758	free_req (prv);
759	}
760
761	ress = rese = 0;
762		1231
763	close (respipe [0]);	1232	close (respipe [0]);
764	close (respipe [1]);	1233	close (respipe [1]);
765	create_pipe ();	1234	create_pipe ();
766		1235
767	atfork_parent ();	1236	atfork_parent ();
768	}	1237	}
769		1238
770	#define dREQ \	1239	#define dREQ \
771	aio_req req; \	1240	aio_req req; \
		1241	int req_pri = next_pri; \
		1242	next_pri = DEFAULT_PRI + PRI_BIAS; \
772	\	1243	\
773	if (SvOK (callback) && !SvROK (callback)) \	1244	if (SvOK (callback) && !SvROK (callback)) \
774	croak ("clalback must be undef or of reference type"); \	1245	croak ("callback must be undef or of reference type"); \
775	\	1246	\
776	Newz (0, req, 1, aio_cb); \	1247	Newz (0, req, 1, aio_cb); \
777	if (!req) \	1248	if (!req) \
778	croak ("out of memory during aio_req allocation"); \	1249	croak ("out of memory during aio_req allocation"); \
779	\	1250	\
780	req->callback = newSVsv (callback);	1251	req->callback = newSVsv (callback); \
		1252	req->pri = req_pri
		1253
		1254	#define REQ_SEND \
		1255	req_send (req); \
		1256	\
		1257	if (GIMME_V != G_VOID) \
		1258	XPUSHs (req_sv (req, AIO_REQ_KLASS));
781		1259
782	MODULE = IO::AIO PACKAGE = IO::AIO	1260	MODULE = IO::AIO PACKAGE = IO::AIO
783		1261
784	PROTOTYPES: ENABLE	1262	PROTOTYPES: ENABLE
785		1263
786	BOOT:	1264	BOOT:
787	{	1265	{
788	HV *stash = gv_stashpv ("IO::AIO", 1);	1266	HV *stash = gv_stashpv ("IO::AIO", 1);
		1267
789	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));	1268	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
790	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));	1269	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
791	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));
792		1274
793	create_pipe ();	1275	create_pipe ();
794	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1276	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
795	}	1277	}
796		1278
797	void	1279	void
798	min_parallel (nthreads)	1280	max_poll_reqs (int nreqs)
799	int nthreads
800	PROTOTYPE: $	1281	PROTOTYPE: $
		1282	CODE:
		1283	max_poll_reqs = nreqs;
801		1284
802	void	1285	void
803	max_parallel (nthreads)	1286	max_poll_time (double nseconds)
804	int nthreads
805	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);
806		1304
807	int	1305	int
808	max_outstanding (nreqs)	1306	max_outstanding (int maxreqs)
809	int nreqs	1307	PROTOTYPE: $
810	PROTOTYPE: $
811	CODE:	1308	CODE:
812	RETVAL = max_outstanding;	1309	RETVAL = max_outstanding;
813	max_outstanding = nreqs;	1310	max_outstanding = maxreqs;
		1311	OUTPUT:
		1312	RETVAL
814		1313
815	void	1314	void
816	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	1315	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
817	SV * pathname	1316	SV8 * pathname
818	int flags	1317	int flags
819	int mode	1318	int mode
820	SV * callback	1319	SV * callback
821	PROTOTYPE: $$$;$	1320	PROTOTYPE: $$$;$
822	CODE:	1321	PPCODE:
823	{	1322	{
824	dREQ;	1323	dREQ;
825		1324
826	req->type = REQ_OPEN;	1325	req->type = REQ_OPEN;
827	req->data = newSVsv (pathname);	1326	req->sv1 = newSVsv (pathname);
828	req->dataptr = SvPVbyte_nolen (req->data);	1327	req->ptr1 = SvPVbyte_nolen (req->sv1);
829	req->fd = flags;	1328	req->int1 = flags;
830	req->mode = mode;	1329	req->mode = mode;
831		1330
832	send_req (req);	1331	REQ_SEND;
833	}	1332	}
834		1333
835	void	1334	void
836	aio_close (fh,callback=&PL_sv_undef)	1335	aio_close (fh,callback=&PL_sv_undef)
837	SV * fh	1336	SV * fh
…		…
839	PROTOTYPE: $;$	1338	PROTOTYPE: $;$
840	ALIAS:	1339	ALIAS:
841	aio_close = REQ_CLOSE	1340	aio_close = REQ_CLOSE
842	aio_fsync = REQ_FSYNC	1341	aio_fsync = REQ_FSYNC
843	aio_fdatasync = REQ_FDATASYNC	1342	aio_fdatasync = REQ_FDATASYNC
844	CODE:	1343	PPCODE:
845	{	1344	{
846	dREQ;	1345	dREQ;
847		1346
848	req->type = ix;	1347	req->type = ix;
849	req->fh = newSVsv (fh);	1348	req->fh = newSVsv (fh);
850	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1349	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
851		1350
852	send_req (req);	1351	REQ_SEND (req);
853	}	1352	}
854		1353
855	void	1354	void
856	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1355	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
857	SV * fh	1356	SV * fh
858	UV offset	1357	UV offset
859	UV length	1358	UV length
860	SV * data	1359	SV8 * data
861	UV dataoffset	1360	UV dataoffset
862	SV * callback	1361	SV * callback
863	ALIAS:	1362	ALIAS:
864	aio_read = REQ_READ	1363	aio_read = REQ_READ
865	aio_write = REQ_WRITE	1364	aio_write = REQ_WRITE
866	PROTOTYPE: $$$$$;$	1365	PROTOTYPE: $$$$$;$
867	CODE:	1366	PPCODE:
868	{	1367	{
869	aio_req req;
870	STRLEN svlen;	1368	STRLEN svlen;
871	char *svptr = SvPVbyte (data, svlen);	1369	char *svptr = SvPVbyte (data, svlen);
872		1370
873	SvUPGRADE (data, SVt_PV);	1371	SvUPGRADE (data, SVt_PV);
874	SvPOK_on (data);	1372	SvPOK_on (data);
…		…
896		1394
897	{	1395	{
898	dREQ;	1396	dREQ;
899		1397
900	req->type = ix;	1398	req->type = ix;
901	req->fh = newSVsv (fh);	1399	req->fh = newSVsv (fh);
902	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1400	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
903	: IoOFP (sv_2io (fh)));	1401	: IoOFP (sv_2io (fh)));
904	req->offset = offset;	1402	req->offs = offset;
905	req->length = length;	1403	req->size = length;
906	req->data = SvREFCNT_inc (data);	1404	req->sv1 = SvREFCNT_inc (data);
907	req->dataptr = (char *)svptr + dataoffset;	1405	req->ptr1 = (char *)svptr + dataoffset;
		1406	req->stroffset = dataoffset;
908		1407
909	if (!SvREADONLY (data))	1408	if (!SvREADONLY (data))
910	{	1409	{
911	SvREADONLY_on (data);	1410	SvREADONLY_on (data);
912	req->data2ptr = (void *)data;	1411	req->flags |= FLAG_SV1_RO_OFF;
913	}	1412	}
914		1413
915	send_req (req);	1414	REQ_SEND;
916	}	1415	}
		1416	}
		1417
		1418	void
		1419	aio_readlink (path,callback=&PL_sv_undef)
		1420	SV8 * path
		1421	SV * callback
		1422	PROTOTYPE: $$;$
		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;
917	}	1438	}
918		1439
919	void	1440	void
920	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)
921	SV * out_fh	1442	SV * out_fh
922	SV * in_fh	1443	SV * in_fh
923	UV in_offset	1444	UV in_offset
924	UV length	1445	UV length
925	SV * callback	1446	SV * callback
926	PROTOTYPE: $$$$;$	1447	PROTOTYPE: $$$$;$
927	CODE:	1448	PPCODE:
928	{	1449	{
929	dREQ;	1450	dREQ;
930		1451
931	req->type = REQ_SENDFILE;	1452	req->type = REQ_SENDFILE;
932	req->fh = newSVsv (out_fh);	1453	req->fh = newSVsv (out_fh);
933	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1454	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
934	req->fh2 = newSVsv (in_fh);	1455	req->sv2 = newSVsv (in_fh);
935	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1456	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
936	req->offset = in_offset;	1457	req->offs = in_offset;
937	req->length = length;	1458	req->size = length;
938		1459
939	send_req (req);	1460	REQ_SEND;
940	}	1461	}
941		1462
942	void	1463	void
943	aio_readahead (fh,offset,length,callback=&PL_sv_undef)	1464	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
944	SV * fh	1465	SV * fh
945	UV offset	1466	UV offset
946	IV length	1467	IV length
947	SV * callback	1468	SV * callback
948	PROTOTYPE: $$$;$	1469	PROTOTYPE: $$$;$
949	CODE:	1470	PPCODE:
950	{	1471	{
951	dREQ;	1472	dREQ;
952		1473
953	req->type = REQ_READAHEAD;	1474	req->type = REQ_READAHEAD;
954	req->fh = newSVsv (fh);	1475	req->fh = newSVsv (fh);
955	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1476	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
956	req->offset = offset;	1477	req->offs = offset;
957	req->length = length;	1478	req->size = length;
958		1479
959	send_req (req);	1480	REQ_SEND;
960	}	1481	}
961		1482
962	void	1483	void
963	aio_stat (fh_or_path,callback=&PL_sv_undef)	1484	aio_stat (fh_or_path,callback=&PL_sv_undef)
964	SV * fh_or_path	1485	SV8 * fh_or_path
965	SV * callback	1486	SV * callback
966	ALIAS:	1487	ALIAS:
967	aio_stat = REQ_STAT	1488	aio_stat = REQ_STAT
968	aio_lstat = REQ_LSTAT	1489	aio_lstat = REQ_LSTAT
969	CODE:	1490	PPCODE:
970	{	1491	{
971	dREQ;	1492	dREQ;
972		1493
973	New (0, req->statdata, 1, Stat_t);	1494	req->ptr2 = malloc (sizeof (Stat_t));
974	if (!req->statdata)	1495	if (!req->ptr2)
975	{	1496	{
976	free_req (req);	1497	req_free (req);
977	croak ("out of memory during aio_req->statdata allocation");	1498	croak ("out of memory during aio_stat statdata allocation");
978	}	1499	}
		1500
		1501	req->flags |= FLAG_PTR2_FREE;
979		1502
980	if (SvPOK (fh_or_path))	1503	if (SvPOK (fh_or_path))
981	{	1504	{
982	req->type = ix;	1505	req->type = ix;
983	req->data = newSVsv (fh_or_path);	1506	req->sv1 = newSVsv (fh_or_path);
984	req->dataptr = SvPVbyte_nolen (req->data);	1507	req->ptr1 = SvPVbyte_nolen (req->sv1);
985	}	1508	}
986	else	1509	else
987	{	1510	{
988	req->type = REQ_FSTAT;	1511	req->type = REQ_FSTAT;
989	req->fh = newSVsv (fh_or_path);	1512	req->fh = newSVsv (fh_or_path);
990	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1513	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
991	}	1514	}
992		1515
993	send_req (req);	1516	REQ_SEND;
994	}	1517	}
995		1518
996	void	1519	void
997	aio_unlink (pathname,callback=&PL_sv_undef)	1520	aio_unlink (pathname,callback=&PL_sv_undef)
998	SV * pathname	1521	SV8 * pathname
999	SV * callback	1522	SV * callback
1000	ALIAS:	1523	ALIAS:
1001	aio_unlink = REQ_UNLINK	1524	aio_unlink = REQ_UNLINK
1002	aio_rmdir = REQ_RMDIR	1525	aio_rmdir = REQ_RMDIR
1003	aio_readdir = REQ_READDIR	1526	aio_readdir = REQ_READDIR
1004	CODE:	1527	PPCODE:
1005	{	1528	{
1006	dREQ;	1529	dREQ;
1007		1530
1008	req->type = ix;	1531	req->type = ix;
1009	req->data = newSVsv (pathname);	1532	req->sv1 = newSVsv (pathname);
1010	req->dataptr = SvPVbyte_nolen (req->data);	1533	req->ptr1 = SvPVbyte_nolen (req->sv1);
1011		1534
1012	send_req (req);	1535	REQ_SEND;
1013	}	1536	}
1014		1537
1015	void	1538	void
1016	aio_link (oldpath,newpath,callback=&PL_sv_undef)	1539	aio_link (oldpath,newpath,callback=&PL_sv_undef)
1017	SV * oldpath	1540	SV8 * oldpath
1018	SV * newpath	1541	SV8 * newpath
1019	SV * callback	1542	SV * callback
1020	ALIAS:	1543	ALIAS:
1021	aio_link = REQ_LINK	1544	aio_link = REQ_LINK
1022	aio_symlink = REQ_SYMLINK	1545	aio_symlink = REQ_SYMLINK
1023	aio_rename = REQ_RENAME	1546	aio_rename = REQ_RENAME
1024	CODE:	1547	PPCODE:
1025	{	1548	{
1026	dREQ;	1549	dREQ;
1027		1550
1028	req->type = ix;	1551	req->type = ix;
1029	req->fh = newSVsv (oldpath);	1552	req->fh = newSVsv (oldpath);
1030	req->data2ptr = SvPVbyte_nolen (req->fh);	1553	req->ptr2 = SvPVbyte_nolen (req->fh);
1031	req->data = newSVsv (newpath);	1554	req->sv1 = newSVsv (newpath);
1032	req->dataptr = SvPVbyte_nolen (req->data);	1555	req->ptr1 = SvPVbyte_nolen (req->sv1);
1033		1556
1034	send_req (req);	1557	REQ_SEND;
1035	}	1558	}
1036		1559
1037	#if 0
1038
1039	# undocumented, because it does not cancel active requests
1040	void	1560	void
1041	cancel_most_requests ()	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
		1595	aio_group (callback=&PL_sv_undef)
		1596	SV * callback
1042	PROTOTYPE:	1597	PROTOTYPE: ;$
1043	CODE:	1598	PPCODE:
1044	{	1599	{
1045	aio_req *req;	1600	dREQ;
1046		1601
1047	pthread_mutex_lock (&reqlock);	1602	req->type = REQ_GROUP;
1048	for (req = reqs; req; req = req->next)
1049	req->flags |= 1;
1050	pthread_mutex_unlock (&reqlock);
1051		1603
1052	pthread_mutex_lock (&reslock);	1604	req_send (req);
1053	for (req = ress; req; req = req->next)	1605	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1054	req->flags |= 1;
1055	pthread_mutex_unlock (&reslock);
1056	}	1606	}
1057		1607
1058	#endif	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;
1059		1641
1060	void	1642	void
1061	flush ()	1643	flush ()
1062	PROTOTYPE:	1644	PROTOTYPE:
1063	CODE:	1645	CODE:
…		…
1065	{	1647	{
1066	poll_wait ();	1648	poll_wait ();
1067	poll_cb ();	1649	poll_cb ();
1068	}	1650	}
1069		1651
1070	void	1652	int
1071	poll()	1653	poll()
1072	PROTOTYPE:	1654	PROTOTYPE:
1073	CODE:	1655	CODE:
1074	if (nreqs)
1075	{
1076	poll_wait ();	1656	poll_wait ();
1077	poll_cb ();	1657	RETVAL = poll_cb ();
1078	}	1658	OUTPUT:
		1659	RETVAL
1079		1660
1080	int	1661	int
1081	poll_fileno()	1662	poll_fileno()
1082	PROTOTYPE:	1663	PROTOTYPE:
1083	CODE:	1664	CODE:
…		…
1095		1676
1096	void	1677	void
1097	poll_wait()	1678	poll_wait()
1098	PROTOTYPE:	1679	PROTOTYPE:
1099	CODE:	1680	CODE:
1100	if (nreqs)
1101	poll_wait ();	1681	poll_wait ();
1102		1682
1103	int	1683	int
1104	nreqs()	1684	nreqs()
1105	PROTOTYPE:	1685	PROTOTYPE:
1106	CODE:	1686	CODE:
1107	RETVAL = nreqs;	1687	RETVAL = nreqs;
1108	OUTPUT:	1688	OUTPUT:
1109	RETVAL	1689	RETVAL
1110		1690
		1691	int
		1692	nready()
		1693	PROTOTYPE:
		1694	CODE:
		1695	RETVAL = get_nready ();
		1696	OUTPUT:
		1697	RETVAL
		1698
		1699	int
		1700	npending()
		1701	PROTOTYPE:
		1702	CODE:
		1703	RETVAL = get_npending ();
		1704	OUTPUT:
		1705	RETVAL
		1706
		1707	int
		1708	nthreads()
		1709	PROTOTYPE:
		1710	CODE:
		1711	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1712	RETVAL = started;
		1713	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1714	OUTPUT:
		1715	RETVAL
		1716
		1717	PROTOTYPES: DISABLE
		1718
		1719	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1720
		1721	void
		1722	cancel (aio_req_ornot req)
		1723	CODE:
		1724	req_cancel (req);
		1725
		1726	void
		1727	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1728	CODE:
		1729	SvREFCNT_dec (req->callback);
		1730	req->callback = newSVsv (callback);
		1731
		1732	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1733
		1734	void
		1735	add (aio_req grp, ...)
		1736	PPCODE:
		1737	{
		1738	int i;
		1739	aio_req req;
		1740
		1741	if (grp->int1 == 2)
		1742	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1743
		1744	for (i = 1; i < items; ++i )
		1745	{
		1746	if (GIMME_V != G_VOID)
		1747	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1748
		1749	req = SvAIO_REQ (ST (i));
		1750
		1751	if (req)
		1752	{
		1753	++grp->size;
		1754	req->grp = grp;
		1755
		1756	req->grp_prev = 0;
		1757	req->grp_next = grp->grp_first;
		1758
		1759	if (grp->grp_first)
		1760	grp->grp_first->grp_prev = req;
		1761
		1762	grp->grp_first = req;
		1763	}
		1764	}
		1765	}
		1766
		1767	void
		1768	cancel_subs (aio_req_ornot req)
		1769	CODE:
		1770	req_cancel_subs (req);
		1771
		1772	void
		1773	result (aio_req grp, ...)
		1774	CODE:
		1775	{
		1776	int i;
		1777	AV *av;
		1778
		1779	grp->errorno = errno;
		1780
		1781	av = newAV ();
		1782
		1783	for (i = 1; i < items; ++i )
		1784	av_push (av, newSVsv (ST (i)));
		1785
		1786	SvREFCNT_dec (grp->sv1);
		1787	grp->sv1 = (SV *)av;
		1788	}
		1789
		1790	void
		1791	errno (aio_req grp, int errorno = errno)
		1792	CODE:
		1793	grp->errorno = errorno;
		1794
		1795	void
		1796	limit (aio_req grp, int limit)
		1797	CODE:
		1798	grp->int2 = limit;
		1799	aio_grp_feed (grp);
		1800
		1801	void
		1802	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1803	CODE:
		1804	{
		1805	SvREFCNT_dec (grp->sv2);
		1806	grp->sv2 = newSVsv (callback);
		1807
		1808	if (grp->int2 <= 0)
		1809	grp->int2 = 2;
		1810
		1811	aio_grp_feed (grp);
		1812	}
		1813

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