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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 1.86 by root, Mon Oct 30 23:30:00 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;
47		91
48	enum {	92	enum {
49	REQ_QUIT,	93	REQ_QUIT,
50	REQ_OPEN, REQ_CLOSE,	94	REQ_OPEN, REQ_CLOSE,
51	REQ_READ, REQ_WRITE, REQ_READAHEAD,	95	REQ_READ, REQ_WRITE, REQ_READAHEAD,
52	REQ_SENDFILE,	96	REQ_SENDFILE,
53	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	97	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
54	REQ_FSYNC, REQ_FDATASYNC,	98	REQ_FSYNC, REQ_FDATASYNC,
55	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,	99	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
56	REQ_READDIR,	100	REQ_MKNOD, REQ_READDIR,
57	REQ_LINK, REQ_SYMLINK,	101	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		102	REQ_GROUP, REQ_NOP,
		103	REQ_BUSY,
58	};	104	};
59		105
		106	#define AIO_REQ_KLASS "IO::AIO::REQ"
		107	#define AIO_GRP_KLASS "IO::AIO::GRP"
		108
60	typedef struct aio_cb {	109	typedef struct aio_cb
		110	{
61	struct aio_cb *volatile next;	111	struct aio_cb *volatile next;
62		112
		113	SV *callback, *fh;
		114	SV *sv1, *sv2;
		115	void *ptr1, *ptr2;
		116	Stat_t *statdata;
		117	off_t offs;
		118	size_t size;
		119	ssize_t result;
		120
		121	STRLEN stroffset;
63	int type;	122	int type;
64		123	int int1, int2;
65	/* should receive a cleanup, with unions */	124	int errorno;
66	int fd, fd2;
67	off_t offset;
68	size_t length;
69	ssize_t result;
70	mode_t mode; /* open */	125	mode_t mode; /* open */
71	int errorno;
72	SV *data, *callback;
73	SV *fh, *fh2;
74	void *dataptr, *data2ptr;
75	STRLEN dataoffset;
76		126
77	Stat_t *statdata;	127	unsigned char flags;
		128	unsigned char pri;
		129
		130	SV *self; /* the perl counterpart of this request, if any */
		131	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
78	} aio_cb;	132	} aio_cb;
79		133
		134	enum {
		135	FLAG_CANCELLED = 0x01,
		136	FLAG_DATA_RO_OFF = 0x80, /* data was set readonly */
		137	};
		138
80	typedef aio_cb *aio_req;	139	typedef aio_cb *aio_req;
		140	typedef aio_cb *aio_req_ornot;
81		141
		142	enum {
		143	PRI_MIN = -4,
		144	PRI_MAX = 4,
		145
		146	DEFAULT_PRI = 0,
		147	PRI_BIAS = -PRI_MIN,
		148	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		149	};
		150
		151	#define AIO_TICKS ((1000000 + 1023) >> 10)
		152
		153	static unsigned int max_poll_time = 0;
		154	static unsigned int max_poll_reqs = 0;
		155
		156	/* calculcate time difference in ~1/AIO_TICKS of a second */
		157	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		158	{
		159	return (tv2->tv_sec - tv1->tv_sec ) * AIO_TICKS
		160	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		161	}
		162
		163	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		164
82	static int started, wanted;	165	static unsigned int started, idle, wanted;
83	static volatile int nreqs;	166
84	static int max_outstanding = 1<<30;	167	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		168	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		169	#else
		170	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
		171	#endif
		172
		173	#define LOCK(mutex) pthread_mutex_lock (&(mutex))
		174	#define UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
		175
		176	/* worker threads management */
		177	static pthread_mutex_t wrklock = AIO_MUTEX_INIT;
		178
		179	typedef struct worker {
		180	/* locked by wrklock */
		181	struct worker *prev, *next;
		182
		183	pthread_t tid;
		184
		185	/* locked by reslock, reqlock or wrklock */
		186	aio_req req; /* currently processed request */
		187	void *dbuf;
		188	DIR *dirp;
		189	} worker;
		190
		191	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		192
		193	static void worker_clear (worker *wrk)
		194	{
		195	if (wrk->dirp)
		196	{
		197	closedir (wrk->dirp);
		198	wrk->dirp = 0;
		199	}
		200
		201	if (wrk->dbuf)
		202	{
		203	free (wrk->dbuf);
		204	wrk->dbuf = 0;
		205	}
		206	}
		207
		208	static void worker_free (worker *wrk)
		209	{
		210	wrk->next->prev = wrk->prev;
		211	wrk->prev->next = wrk->next;
		212
		213	free (wrk);
		214	}
		215
		216	static volatile unsigned int nreqs, nready, npending;
		217	static volatile unsigned int max_idle = 4;
		218	static volatile unsigned int max_outstanding = 0xffffffff;
85	static int respipe [2];	219	static int respipe [2];
86		220
87	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	221	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
88	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	222	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
89	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	223	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
90		224
91	static volatile aio_req reqs, reqe; /* queue start, queue end */	225	#if WORDACCESS_UNSAFE
92	static volatile aio_req ress, rese; /* queue start, queue end */
93		226
		227	static unsigned int get_nready ()
		228	{
		229	unsigned int retval;
		230
		231	LOCK (reqlock);
		232	retval = nready;
		233	UNLOCK (reqlock);
		234
		235	return retval;
		236	}
		237
		238	static unsigned int get_npending ()
		239	{
		240	unsigned int retval;
		241
		242	LOCK (reslock);
		243	retval = npending;
		244	UNLOCK (reslock);
		245
		246	return retval;
		247	}
		248
		249	static unsigned int get_nthreads ()
		250	{
		251	unsigned int retval;
		252
		253	LOCK (wrklock);
		254	retval = started;
		255	UNLOCK (wrklock);
		256
		257	return retval;
		258	}
		259
		260	#else
		261
		262	# define get_nready() nready
		263	# define get_npending() npending
		264	# define get_nthreads() started
		265
		266	#endif
		267
		268	/*
		269	* a somewhat faster data structure might be nice, but
		270	* with 8 priorities this actually needs <20 insns
		271	* per shift, the most expensive operation.
		272	*/
		273	typedef struct {
		274	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		275	int size;
		276	} reqq;
		277
		278	static reqq req_queue;
		279	static reqq res_queue;
		280
		281	int reqq_push (reqq *q, aio_req req)
		282	{
		283	int pri = req->pri;
		284	req->next = 0;
		285
		286	if (q->qe[pri])
		287	{
		288	q->qe[pri]->next = req;
		289	q->qe[pri] = req;
		290	}
		291	else
		292	q->qe[pri] = q->qs[pri] = req;
		293
		294	return q->size++;
		295	}
		296
		297	aio_req reqq_shift (reqq *q)
		298	{
		299	int pri;
		300
		301	if (!q->size)
		302	return 0;
		303
		304	--q->size;
		305
		306	for (pri = NUM_PRI; pri--; )
		307	{
		308	aio_req req = q->qs[pri];
		309
		310	if (req)
		311	{
		312	if (!(q->qs[pri] = req->next))
		313	q->qe[pri] = 0;
		314
		315	return req;
		316	}
		317	}
		318
		319	abort ();
		320	}
		321
		322	static int poll_cb ();
		323	static void req_invoke (aio_req req);
94	static void free_req (aio_req req)	324	static void req_free (aio_req req);
95	{	325	static void req_cancel (aio_req req);
96	if (req->data)
97	SvREFCNT_dec (req->data);
98		326
		327	/* must be called at most once */
		328	static SV *req_sv (aio_req req, const char *klass)
		329	{
99	if (req->fh)	330	if (!req->self)
100	SvREFCNT_dec (req->fh);	331	{
		332	req->self = (SV *)newHV ();
		333	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		334	}
101		335
102	if (req->fh2)	336	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		337	}
		338
		339	static aio_req SvAIO_REQ (SV *sv)
		340	{
		341	MAGIC *mg;
		342
		343	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		344	croak ("object of class " AIO_REQ_KLASS " expected");
		345
		346	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		347
		348	return mg ? (aio_req)mg->mg_ptr : 0;
		349	}
		350
		351	static void aio_grp_feed (aio_req grp)
		352	{
		353	while (grp->size < grp->int2 && !(grp->flags & FLAG_CANCELLED))
		354	{
		355	int old_len = grp->size;
		356
		357	if (grp->sv2 && SvOK (grp->sv2))
		358	{
		359	dSP;
		360
		361	ENTER;
		362	SAVETMPS;
		363	PUSHMARK (SP);
		364	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		365	PUTBACK;
		366	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		367	SPAGAIN;
		368	FREETMPS;
		369	LEAVE;
		370	}
		371
		372	/* stop if no progress has been made */
		373	if (old_len == grp->size)
		374	{
103	SvREFCNT_dec (req->fh2);	375	SvREFCNT_dec (grp->sv2);
		376	grp->sv2 = 0;
		377	break;
		378	}
		379	}
		380	}
		381
		382	static void aio_grp_dec (aio_req grp)
		383	{
		384	--grp->size;
		385
		386	/* call feeder, if applicable */
		387	aio_grp_feed (grp);
		388
		389	/* finish, if done */
		390	if (!grp->size && grp->int1)
		391	{
		392	req_invoke (grp);
		393	req_free (grp);
		394	}
		395	}
		396
		397	static void req_invoke (aio_req req)
		398	{
		399	dSP;
		400
		401	if (req->flags & FLAG_DATA_RO_OFF)
		402	SvREADONLY_off (req->sv1);
104		403
105	if (req->statdata)	404	if (req->statdata)
106	Safefree (req->statdata);	405	{
		406	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		407	PL_laststatval = req->result;
		408	PL_statcache = *(req->statdata);
		409	}
107		410
108	if (req->callback)	411	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		412	{
		413	ENTER;
		414	SAVETMPS;
		415	PUSHMARK (SP);
		416	EXTEND (SP, 1);
		417
		418	switch (req->type)
		419	{
		420	case REQ_READDIR:
		421	{
		422	SV *rv = &PL_sv_undef;
		423
		424	if (req->result >= 0)
		425	{
		426	int i;
		427	char *buf = req->ptr2;
		428	AV *av = newAV ();
		429
		430	av_extend (av, req->result - 1);
		431
		432	for (i = 0; i < req->result; ++i)
		433	{
		434	SV *sv = newSVpv (buf, 0);
		435
		436	av_store (av, i, sv);
		437	buf += SvCUR (sv) + 1;
		438	}
		439
		440	rv = sv_2mortal (newRV_noinc ((SV *)av));
		441	}
		442
		443	PUSHs (rv);
		444	}
		445	break;
		446
		447	case REQ_OPEN:
		448	{
		449	/* convert fd to fh */
		450	SV *fh;
		451
		452	PUSHs (sv_2mortal (newSViv (req->result)));
		453	PUTBACK;
		454	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		455	SPAGAIN;
		456
		457	fh = SvREFCNT_inc (POPs);
		458
		459	PUSHMARK (SP);
		460	XPUSHs (sv_2mortal (fh));
		461	}
		462	break;
		463
		464	case REQ_GROUP:
		465	req->int1 = 2; /* mark group as finished */
		466
		467	if (req->sv1)
		468	{
		469	int i;
		470	AV *av = (AV *)req->sv1;
		471
		472	EXTEND (SP, AvFILL (av) + 1);
		473	for (i = 0; i <= AvFILL (av); ++i)
		474	PUSHs (*av_fetch (av, i, 0));
		475	}
		476	break;
		477
		478	case REQ_NOP:
		479	case REQ_BUSY:
		480	break;
		481
		482	case REQ_READLINK:
		483	if (req->result > 0)
		484	{
		485	SvCUR_set (req->sv1, req->result);
		486	*SvEND (req->sv1) = 0;
		487	PUSHs (req->sv1);
		488	}
		489	break;
		490
		491	case REQ_READ:
		492	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		493	*SvEND (req->sv1) = 0;
		494	/* fall through */
		495	default:
		496	PUSHs (sv_2mortal (newSViv (req->result)));
		497	break;
		498	}
		499
		500	errno = req->errorno;
		501
		502	PUTBACK;
		503	call_sv (req->callback, G_VOID | G_EVAL);
		504	SPAGAIN;
		505
		506	FREETMPS;
		507	LEAVE;
		508	}
		509
		510	if (req->grp)
		511	{
		512	aio_req grp = req->grp;
		513
		514	/* unlink request */
		515	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		516	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		517
		518	if (grp->grp_first == req)
		519	grp->grp_first = req->grp_next;
		520
		521	aio_grp_dec (grp);
		522	}
		523
		524	if (SvTRUE (ERRSV))
		525	{
		526	req_free (req);
		527	croak (0);
		528	}
		529	}
		530
		531	static void req_free (aio_req req)
		532	{
		533	if (req->self)
		534	{
		535	sv_unmagic (req->self, PERL_MAGIC_ext);
		536	SvREFCNT_dec (req->self);
		537	}
		538
		539	SvREFCNT_dec (req->fh);
		540	SvREFCNT_dec (req->sv1);
		541	SvREFCNT_dec (req->sv2);
109	SvREFCNT_dec (req->callback);	542	SvREFCNT_dec (req->callback);
		543	Safefree (req->statdata);
110		544
111	if (req->type == REQ_READDIR && req->result >= 0)	545	if (req->type == REQ_READDIR)
112	free (req->data2ptr);	546	free (req->ptr2);
113		547
114	Safefree (req);	548	Safefree (req);
115	}	549	}
116		550
117	static void	551	static void req_cancel_subs (aio_req grp)
118	poll_wait ()
119	{	552	{
120	if (nreqs && !ress)	553	aio_req sub;
		554
		555	if (grp->type != REQ_GROUP)
		556	return;
		557
		558	SvREFCNT_dec (grp->sv2);
		559	grp->sv2 = 0;
		560
		561	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		562	req_cancel (sub);
		563	}
		564
		565	static void req_cancel (aio_req req)
		566	{
		567	req->flags |= FLAG_CANCELLED;
		568
		569	req_cancel_subs (req);
		570	}
		571
		572	static void *aio_proc(void *arg);
		573
		574	static void start_thread (void)
		575	{
		576	sigset_t fullsigset, oldsigset;
		577	pthread_attr_t attr;
		578
		579	worker *wrk = calloc (1, sizeof (worker));
		580
		581	if (!wrk)
		582	croak ("unable to allocate worker thread data");
		583
		584	pthread_attr_init (&attr);
		585	pthread_attr_setstacksize (&attr, STACKSIZE);
		586	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		587	#ifdef PTHREAD_SCOPE_PROCESS
		588	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		589	#endif
		590
		591	sigfillset (&fullsigset);
		592
		593	LOCK (wrklock);
		594	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
		595
		596	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
		597	{
		598	wrk->prev = &wrk_first;
		599	wrk->next = wrk_first.next;
		600	wrk_first.next->prev = wrk;
		601	wrk_first.next = wrk;
		602	++started;
121	{	603	}
		604	else
		605	free (wrk);
		606
		607	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		608	UNLOCK (wrklock);
		609	}
		610
		611	static void maybe_start_thread ()
		612	{
		613	if (get_nthreads () >= wanted)
		614	return;
		615
		616	/* todo: maybe use idle here, but might be less exact */
		617	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		618	return;
		619
		620	start_thread ();
		621	}
		622
		623	static void req_send (aio_req req)
		624	{
		625	++nreqs;
		626
		627	LOCK (reqlock);
		628	++nready;
		629	reqq_push (&req_queue, req);
		630	pthread_cond_signal (&reqwait);
		631	UNLOCK (reqlock);
		632
		633	maybe_start_thread ();
		634	}
		635
		636	static void end_thread (void)
		637	{
		638	aio_req req;
		639
		640	Newz (0, req, 1, aio_cb);
		641
		642	req->type = REQ_QUIT;
		643	req->pri = PRI_MAX + PRI_BIAS;
		644
		645	LOCK (reqlock);
		646	reqq_push (&req_queue, req);
		647	pthread_cond_signal (&reqwait);
		648	UNLOCK (reqlock);
		649
		650	LOCK (wrklock);
		651	--started;
		652	UNLOCK (wrklock);
		653	}
		654
		655	static void set_max_idle (int nthreads)
		656	{
		657	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		658	max_idle = nthreads <= 0 ? 1 : nthreads;
		659	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
		660	}
		661
		662	static void min_parallel (int nthreads)
		663	{
		664	if (wanted < nthreads)
		665	wanted = nthreads;
		666	}
		667
		668	static void max_parallel (int nthreads)
		669	{
		670	if (wanted > nthreads)
		671	wanted = nthreads;
		672
		673	while (started > wanted)
		674	end_thread ();
		675	}
		676
		677	static void poll_wait ()
		678	{
122	fd_set rfd;	679	fd_set rfd;
		680
		681	while (nreqs)
		682	{
		683	int size;
		684	if (WORDACCESS_UNSAFE) LOCK (reslock);
		685	size = res_queue.size;
		686	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		687
		688	if (size)
		689	return;
		690
		691	maybe_start_thread ();
		692
123	FD_ZERO(&rfd);	693	FD_ZERO(&rfd);
124	FD_SET(respipe [0], &rfd);	694	FD_SET(respipe [0], &rfd);
125		695
126	select (respipe [0] + 1, &rfd, 0, 0, 0);	696	select (respipe [0] + 1, &rfd, 0, 0, 0);
127	}	697	}
128	}	698	}
129		699
130	static int	700	static int poll_cb ()
131	poll_cb ()
132	{	701	{
133	dSP;	702	dSP;
134	int count = 0;	703	int count = 0;
		704	int maxreqs = max_poll_reqs;
135	int do_croak = 0;	705	int do_croak = 0;
		706	struct timeval tv_start, tv_now;
136	aio_req req;	707	aio_req req;
137		708
		709	if (max_poll_time)
		710	gettimeofday (&tv_start, 0);
		711
138	for (;;)	712	for (;;)
139	{	713	{
140	pthread_mutex_lock (&reslock);	714	for (;;)
141	req = ress;
142
143	if (req)
144	{	715	{
145	ress = req->next;	716	maybe_start_thread ();
146		717
		718	LOCK (reslock);
		719	req = reqq_shift (&res_queue);
		720
147	if (!ress)	721	if (req)
148	{	722	{
		723	--npending;
		724
		725	if (!res_queue.size)
		726	{
149	/* read any signals sent by the worker threads */	727	/* read any signals sent by the worker threads */
150	char buf [32];	728	char buf [32];
151	while (read (respipe [0], buf, 32) == 32)	729	while (read (respipe [0], buf, 32) == 32)
		730	;
152	;	731	}
153
154	rese = 0;
155	}	732	}
156	}
157		733
158	pthread_mutex_unlock (&reslock);	734	UNLOCK (reslock);
159		735
160	if (!req)	736	if (!req)
161	break;	737	break;
162		738
163	nreqs--;	739	--nreqs;
164		740
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)	741	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	{	742	{
180	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	743	req->int1 = 1; /* mark request as delayed */
181	PL_laststatval = req->result;	744	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	}	745	}
211	else	746	else
212	{	747	{
213	XPUSHs (sv_2mortal (newSViv (req->result)));	748	req_invoke (req);
214		749
215	if (req->type == REQ_OPEN)	750	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	}	751	}
230		752
231	if (SvOK (req->callback))	753	req_free (req);
		754
		755	if (maxreqs && !--maxreqs)
		756	break;
		757
		758	if (max_poll_time)
232	{	759	{
233	PUTBACK;	760	gettimeofday (&tv_now, 0);
234	call_sv (req->callback, G_VOID | G_EVAL);
235	SPAGAIN;
236		761
237	if (SvTRUE (ERRSV))	762	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
238	{	763	break;
239	free_req (req);
240	croak (0);
241	}
242	}	764	}
243
244	LEAVE;
245
246	errno = errorno;
247	count++;
248	}	765	}
249		766
250	free_req (req);	767	if (nreqs <= max_outstanding)
		768	break;
		769
		770	poll_wait ();
		771
		772	++maxreqs;
251	}	773	}
252		774
253	return count;	775	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	}	776	}
348		777
349	static void create_pipe ()	778	static void create_pipe ()
350	{	779	{
351	if (pipe (respipe))	780	if (pipe (respipe))
…		…
370	* normal read/write by using a mutex. slows down execution a lot,	799	* normal read/write by using a mutex. slows down execution a lot,
371	* but that's your problem, not mine.	800	* but that's your problem, not mine.
372	*/	801	*/
373	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;	802	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
374		803
375	static ssize_t	804	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	{	805	{
378	ssize_t res;	806	ssize_t res;
379	off_t ooffset;	807	off_t ooffset;
380		808
381	pthread_mutex_lock (&preadwritelock);	809	LOCK (preadwritelock);
382	ooffset = lseek (fd, 0, SEEK_CUR);	810	ooffset = lseek (fd, 0, SEEK_CUR);
383	lseek (fd, offset, SEEK_SET);	811	lseek (fd, offset, SEEK_SET);
384	res = read (fd, buf, count);	812	res = read (fd, buf, count);
385	lseek (fd, ooffset, SEEK_SET);	813	lseek (fd, ooffset, SEEK_SET);
386	pthread_mutex_unlock (&preadwritelock);	814	UNLOCK (preadwritelock);
387		815
388	return res;	816	return res;
389	}	817	}
390		818
391	static ssize_t
392	pwrite (int fd, void *buf, size_t count, off_t offset)	819	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
393	{	820	{
394	ssize_t res;	821	ssize_t res;
395	off_t ooffset;	822	off_t ooffset;
396		823
397	pthread_mutex_lock (&preadwritelock);	824	LOCK (preadwritelock);
398	ooffset = lseek (fd, 0, SEEK_CUR);	825	ooffset = lseek (fd, 0, SEEK_CUR);
399	lseek (fd, offset, SEEK_SET);	826	lseek (fd, offset, SEEK_SET);
400	res = write (fd, buf, count);	827	res = write (fd, buf, count);
401	lseek (fd, offset, SEEK_SET);	828	lseek (fd, offset, SEEK_SET);
402	pthread_mutex_unlock (&preadwritelock);	829	UNLOCK (preadwritelock);
403		830
404	return res;	831	return res;
405	}	832	}
406	#endif	833	#endif
407		834
408	#if !HAVE_FDATASYNC	835	#if !HAVE_FDATASYNC
409	# define fdatasync fsync	836	# define fdatasync fsync
410	#endif	837	#endif
411		838
412	#if !HAVE_READAHEAD	839	#if !HAVE_READAHEAD
413	# define readahead aio_readahead	840	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
414		841
415	static ssize_t	842	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	{	843	{
418	char readahead_buf[4096];	844	dBUF;
419		845
420	while (count > 0)	846	while (count > 0)
421	{	847	{
422	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	848	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
423		849
424	pread (fd, readahead_buf, len, offset);	850	pread (fd, aio_buf, len, offset);
425	offset += len;	851	offset += len;
426	count -= len;	852	count -= len;
427	}	853	}
428		854
429	errno = 0;	855	errno = 0;
430	}	856	}
		857
431	#endif	858	#endif
432		859
433	#if !HAVE_READDIR_R	860	#if !HAVE_READDIR_R
434	# define readdir_r aio_readdir_r	861	# define readdir_r aio_readdir_r
435		862
436	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;	863	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
437		864
438	static int
439	readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)	865	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
440	{	866	{
441	struct dirent *e;	867	struct dirent *e;
442	int errorno;	868	int errorno;
443		869
444	pthread_mutex_lock (&readdirlock);	870	LOCK (readdirlock);
445		871
446	e = readdir (dirp);	872	e = readdir (dirp);
447	errorno = errno;	873	errorno = errno;
448		874
449	if (e)	875	if (e)
…		…
452	strcpy (ent->d_name, e->d_name);	878	strcpy (ent->d_name, e->d_name);
453	}	879	}
454	else	880	else
455	*res = 0;	881	*res = 0;
456		882
457	pthread_mutex_unlock (&readdirlock);	883	UNLOCK (readdirlock);
458		884
459	errno = errorno;	885	errno = errorno;
460	return e ? 0 : -1;	886	return e ? 0 : -1;
461	}	887	}
462	#endif	888	#endif
463		889
464	/* sendfile always needs emulation */	890	/* sendfile always needs emulation */
465	static ssize_t
466	sendfile_ (int ofd, int ifd, off_t offset, size_t count)	891	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
467	{	892	{
468	ssize_t res;	893	ssize_t res;
469		894
470	if (!count)	895	if (!count)
471	return 0;	896	return 0;
…		…
482	{	907	{
483	off_t sbytes;	908	off_t sbytes;
484	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	909	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
485		910
486	if (res < 0 && sbytes)	911	if (res < 0 && sbytes)
487	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	912	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
488	res = sbytes;	913	res = sbytes;
489	}	914	}
490		915
491	# elif __hpux	916	# elif __hpux
492	res = sendfile (ofd, ifd, offset, count, 0, 0);	917	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
520	#endif	945	#endif
521	)	946	)
522	)	947	)
523	{	948	{
524	/* emulate sendfile. this is a major pain in the ass */	949	/* emulate sendfile. this is a major pain in the ass */
525	char buf[4096];	950	dBUF;
		951
526	res = 0;	952	res = 0;
527		953
528	while (count)	954	while (count)
529	{	955	{
530	ssize_t cnt;	956	ssize_t cnt;
531		957
532	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	958	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
533		959
534	if (cnt <= 0)	960	if (cnt <= 0)
535	{	961	{
536	if (cnt && !res) res = -1;	962	if (cnt && !res) res = -1;
537	break;	963	break;
538	}	964	}
539		965
540	cnt = write (ofd, buf, cnt);	966	cnt = write (ofd, aio_buf, cnt);
541		967
542	if (cnt <= 0)	968	if (cnt <= 0)
543	{	969	{
544	if (cnt && !res) res = -1;	970	if (cnt && !res) res = -1;
545	break;	971	break;
…		…
553		979
554	return res;	980	return res;
555	}	981	}
556		982
557	/* read a full directory */	983	/* read a full directory */
558	static int	984	static void scandir_ (aio_req req, worker *self)
559	scandir_ (const char *path, void **namesp)
560	{	985	{
561	DIR *dirp = opendir (path);	986	DIR *dirp;
562	union	987	union
563	{	988	{
564	struct dirent d;	989	struct dirent d;
565	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	990	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
566	} u;	991	} *u;
567	struct dirent *entp;	992	struct dirent *entp;
568	char *name, *names;	993	char *name, *names;
569	int memlen = 4096;	994	int memlen = 4096;
570	int memofs = 0;	995	int memofs = 0;
571	int res = 0;	996	int res = 0;
572	int errorno;	997	int errorno;
573		998
574	if (!dirp)	999	LOCK (wrklock);
575	return -1;	1000	self->dirp = dirp = opendir (req->ptr1);
576		1001	self->dbuf = u = malloc (sizeof (*u));
577	names = malloc (memlen);	1002	req->ptr2 = names = malloc (memlen);
		1003	UNLOCK (wrklock);
		1004
		1005	if (dirp && u && names)
		1006	for (;;)
		1007	{
		1008	errno = 0;
		1009	readdir_r (dirp, &u->d, &entp);
		1010
		1011	if (!entp)
		1012	break;
		1013
		1014	name = entp->d_name;
		1015
		1016	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1017	{
		1018	int len = strlen (name) + 1;
		1019
		1020	res++;
		1021
		1022	while (memofs + len > memlen)
		1023	{
		1024	memlen *= 2;
		1025	LOCK (wrklock);
		1026	req->ptr2 = names = realloc (names, memlen);
		1027	UNLOCK (wrklock);
		1028
		1029	if (!names)
		1030	break;
		1031	}
		1032
		1033	memcpy (names + memofs, name, len);
		1034	memofs += len;
		1035	}
		1036	}
		1037
		1038	if (errno)
		1039	res = -1;
		1040
		1041	req->result = res;
		1042	}
		1043
		1044	/*****************************************************************************/
		1045
		1046	static void *aio_proc (void *thr_arg)
		1047	{
		1048	aio_req req;
		1049	struct timespec ts;
		1050	worker *self = (worker *)thr_arg;
		1051
		1052	/* try to distribute timeouts somewhat evenly */
		1053	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1054	* (1000000000UL / 1024UL);
578		1055
579	for (;;)	1056	for (;;)
580	{	1057	{
581	errno = 0, readdir_r (dirp, &u.d, &entp);	1058	ts.tv_sec = time (0) + IDLE_TIMEOUT;
582		1059
583	if (!entp)	1060	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		1061
633	for (;;)	1062	for (;;)
634	{	1063	{
635	req = reqs;	1064	self->req = req = reqq_shift (&req_queue);
636
637	if (reqs)
638	{
639	reqs = reqs->next;
640	if (!reqs) reqe = 0;
641	}
642		1065
643	if (req)	1066	if (req)
644	break;	1067	break;
645		1068
		1069	++idle;
		1070
		1071	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1072	== ETIMEDOUT)
		1073	{
		1074	if (idle > max_idle)
		1075	{
		1076	--idle;
		1077	UNLOCK (reqlock);
		1078	LOCK (wrklock);
		1079	--started;
		1080	UNLOCK (wrklock);
		1081	goto quit;
		1082	}
		1083
		1084	/* we are allowed to idle, so do so without any timeout */
646	pthread_cond_wait (&reqwait, &reqlock);	1085	pthread_cond_wait (&reqwait, &reqlock);
		1086	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1087	}
		1088
		1089	--idle;
647	}	1090	}
648		1091
649	pthread_mutex_unlock (&reqlock);	1092	--nready;
		1093
		1094	UNLOCK (reqlock);
650		1095
651	errno = 0; /* strictly unnecessary */	1096	errno = 0; /* strictly unnecessary */
652		1097
653	type = req->type;	1098	if (!(req->flags & FLAG_CANCELLED))
654
655	switch (type)	1099	switch (req->type)
656	{	1100	{
657	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	1101	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;	1102	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
659		1103
660	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	1104	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;	1105	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
662		1106
663	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1107	case REQ_STAT: req->result = stat (req->ptr1, req->statdata); break;
664	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1108	case REQ_LSTAT: req->result = lstat (req->ptr1, req->statdata); break;
665	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1109	case REQ_FSTAT: req->result = fstat (req->int1, req->statdata); break;
666		1110
667	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	1111	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
668	case REQ_CLOSE: req->result = close (req->fd); break;	1112	case REQ_CLOSE: req->result = close (req->int1); break;
669	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1113	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
670	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1114	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
671	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;	1115	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
672	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;	1116	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
673	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	1117	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1118	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1119	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
674		1120
675	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1121	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
676	case REQ_FSYNC: req->result = fsync (req->fd); break;	1122	case REQ_FSYNC: req->result = fsync (req->int1); break;
677	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;	1123	case REQ_READDIR: scandir_ (req, self); break;
678		1124
		1125	case REQ_BUSY:
		1126	{
		1127	struct timeval tv;
		1128
		1129	tv.tv_sec = req->int1;
		1130	tv.tv_usec = req->int2;
		1131
		1132	req->result = select (0, 0, 0, 0, &tv);
		1133	}
		1134
		1135	case REQ_GROUP:
		1136	case REQ_NOP:
		1137	break;
		1138
679	case REQ_QUIT:	1139	case REQ_QUIT:
680	break;	1140	goto quit;
681		1141
682	default:	1142	default:
683	req->result = ENOSYS;	1143	req->result = ENOSYS;
684	break;	1144	break;
685	}	1145	}
686		1146
687	req->errorno = errno;	1147	req->errorno = errno;
688		1148
689	pthread_mutex_lock (&reslock);	1149	LOCK (reslock);
690		1150
691	req->next = 0;	1151	++npending;
692		1152
693	if (rese)	1153	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 */	1154	/* write a dummy byte to the pipe so fh becomes ready */
703	write (respipe [1], &respipe, 1);	1155	write (respipe [1], &respipe, 1);
704	}
705		1156
706	pthread_mutex_unlock (&reslock);	1157	self->req = 0;
		1158	worker_clear (self);
		1159
		1160	UNLOCK (reslock);
707	}	1161	}
708	while (type != REQ_QUIT);	1162
		1163	quit:
		1164	LOCK (wrklock);
		1165	worker_free (self);
		1166	UNLOCK (wrklock);
709		1167
710	return 0;	1168	return 0;
711	}	1169	}
712		1170
713	/*****************************************************************************/	1171	/*****************************************************************************/
714		1172
715	static void atfork_prepare (void)	1173	static void atfork_prepare (void)
716	{	1174	{
717	pthread_mutex_lock (&reqlock);	1175	LOCK (wrklock);
718	pthread_mutex_lock (&reslock);	1176	LOCK (reqlock);
		1177	LOCK (reslock);
719	#if !HAVE_PREADWRITE	1178	#if !HAVE_PREADWRITE
720	pthread_mutex_lock (&preadwritelock);	1179	LOCK (preadwritelock);
721	#endif	1180	#endif
722	#if !HAVE_READDIR_R	1181	#if !HAVE_READDIR_R
723	pthread_mutex_lock (&readdirlock);	1182	LOCK (readdirlock);
724	#endif	1183	#endif
725	}	1184	}
726		1185
727	static void atfork_parent (void)	1186	static void atfork_parent (void)
728	{	1187	{
729	#if !HAVE_READDIR_R	1188	#if !HAVE_READDIR_R
730	pthread_mutex_unlock (&readdirlock);	1189	UNLOCK (readdirlock);
731	#endif	1190	#endif
732	#if !HAVE_PREADWRITE	1191	#if !HAVE_PREADWRITE
733	pthread_mutex_unlock (&preadwritelock);	1192	UNLOCK (preadwritelock);
734	#endif	1193	#endif
735	pthread_mutex_unlock (&reslock);	1194	UNLOCK (reslock);
736	pthread_mutex_unlock (&reqlock);	1195	UNLOCK (reqlock);
		1196	UNLOCK (wrklock);
737	}	1197	}
738		1198
739	static void atfork_child (void)	1199	static void atfork_child (void)
740	{	1200	{
741	aio_req prv;	1201	aio_req prv;
742		1202
		1203	while (prv = reqq_shift (&req_queue))
		1204	req_free (prv);
		1205
		1206	while (prv = reqq_shift (&res_queue))
		1207	req_free (prv);
		1208
		1209	while (wrk_first.next != &wrk_first)
		1210	{
		1211	worker *wrk = wrk_first.next;
		1212
		1213	if (wrk->req)
		1214	req_free (wrk->req);
		1215
		1216	worker_clear (wrk);
		1217	worker_free (wrk);
		1218	}
		1219
743	started = 0;	1220	started = 0;
744		1221	idle = 0;
745	while (reqs)	1222	nreqs = 0;
746	{	1223	nready = 0;
747	prv = reqs;	1224	npending = 0;
748	reqs = prv->next;
749	free_req (prv);
750	}
751
752	reqs = reqe = 0;
753
754	while (ress)
755	{
756	prv = ress;
757	ress = prv->next;
758	free_req (prv);
759	}
760
761	ress = rese = 0;
762		1225
763	close (respipe [0]);	1226	close (respipe [0]);
764	close (respipe [1]);	1227	close (respipe [1]);
765	create_pipe ();	1228	create_pipe ();
766		1229
767	atfork_parent ();	1230	atfork_parent ();
768	}	1231	}
769		1232
770	#define dREQ \	1233	#define dREQ \
771	aio_req req; \	1234	aio_req req; \
		1235	int req_pri = next_pri; \
		1236	next_pri = DEFAULT_PRI + PRI_BIAS; \
772	\	1237	\
773	if (SvOK (callback) && !SvROK (callback)) \	1238	if (SvOK (callback) && !SvROK (callback)) \
774	croak ("clalback must be undef or of reference type"); \	1239	croak ("callback must be undef or of reference type"); \
775	\	1240	\
776	Newz (0, req, 1, aio_cb); \	1241	Newz (0, req, 1, aio_cb); \
777	if (!req) \	1242	if (!req) \
778	croak ("out of memory during aio_req allocation"); \	1243	croak ("out of memory during aio_req allocation"); \
779	\	1244	\
780	req->callback = newSVsv (callback);	1245	req->callback = newSVsv (callback); \
		1246	req->pri = req_pri
		1247
		1248	#define REQ_SEND \
		1249	req_send (req); \
		1250	\
		1251	if (GIMME_V != G_VOID) \
		1252	XPUSHs (req_sv (req, AIO_REQ_KLASS));
781		1253
782	MODULE = IO::AIO PACKAGE = IO::AIO	1254	MODULE = IO::AIO PACKAGE = IO::AIO
783		1255
784	PROTOTYPES: ENABLE	1256	PROTOTYPES: ENABLE
785		1257
786	BOOT:	1258	BOOT:
787	{	1259	{
788	HV *stash = gv_stashpv ("IO::AIO", 1);	1260	HV *stash = gv_stashpv ("IO::AIO", 1);
		1261
789	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));	1262	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
790	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));	1263	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
791	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));	1264	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1265	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1266	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1267	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
792		1268
793	create_pipe ();	1269	create_pipe ();
794	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1270	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
795	}	1271	}
796		1272
797	void	1273	void
798	min_parallel (nthreads)	1274	max_poll_reqs (int nreqs)
799	int nthreads
800	PROTOTYPE: $	1275	PROTOTYPE: $
		1276	CODE:
		1277	max_poll_reqs = nreqs;
801		1278
802	void	1279	void
803	max_parallel (nthreads)	1280	max_poll_time (double nseconds)
804	int nthreads
805	PROTOTYPE: $	1281	PROTOTYPE: $
		1282	CODE:
		1283	max_poll_time = nseconds * AIO_TICKS;
		1284
		1285	void
		1286	min_parallel (int nthreads)
		1287	PROTOTYPE: $
		1288
		1289	void
		1290	max_parallel (int nthreads)
		1291	PROTOTYPE: $
		1292
		1293	void
		1294	max_idle (int nthreads)
		1295	PROTOTYPE: $
		1296	CODE:
		1297	set_max_idle (nthreads);
806		1298
807	int	1299	int
808	max_outstanding (nreqs)	1300	max_outstanding (int maxreqs)
809	int nreqs	1301	PROTOTYPE: $
810	PROTOTYPE: $
811	CODE:	1302	CODE:
812	RETVAL = max_outstanding;	1303	RETVAL = max_outstanding;
813	max_outstanding = nreqs;	1304	max_outstanding = maxreqs;
		1305	OUTPUT:
		1306	RETVAL
814		1307
815	void	1308	void
816	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	1309	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
817	SV * pathname	1310	SV * pathname
818	int flags	1311	int flags
819	int mode	1312	int mode
820	SV * callback	1313	SV * callback
821	PROTOTYPE: $$$;$	1314	PROTOTYPE: $$$;$
822	CODE:	1315	PPCODE:
823	{	1316	{
824	dREQ;	1317	dREQ;
825		1318
826	req->type = REQ_OPEN;	1319	req->type = REQ_OPEN;
827	req->data = newSVsv (pathname);	1320	req->sv1 = newSVsv (pathname);
828	req->dataptr = SvPVbyte_nolen (req->data);	1321	req->ptr1 = SvPVbyte_nolen (pathname);
829	req->fd = flags;	1322	req->int1 = flags;
830	req->mode = mode;	1323	req->mode = mode;
831		1324
832	send_req (req);	1325	REQ_SEND;
833	}	1326	}
834		1327
835	void	1328	void
836	aio_close (fh,callback=&PL_sv_undef)	1329	aio_close (fh,callback=&PL_sv_undef)
837	SV * fh	1330	SV * fh
…		…
839	PROTOTYPE: $;$	1332	PROTOTYPE: $;$
840	ALIAS:	1333	ALIAS:
841	aio_close = REQ_CLOSE	1334	aio_close = REQ_CLOSE
842	aio_fsync = REQ_FSYNC	1335	aio_fsync = REQ_FSYNC
843	aio_fdatasync = REQ_FDATASYNC	1336	aio_fdatasync = REQ_FDATASYNC
844	CODE:	1337	PPCODE:
845	{	1338	{
846	dREQ;	1339	dREQ;
847		1340
848	req->type = ix;	1341	req->type = ix;
849	req->fh = newSVsv (fh);	1342	req->fh = newSVsv (fh);
850	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1343	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
851		1344
852	send_req (req);	1345	REQ_SEND (req);
853	}	1346	}
854		1347
855	void	1348	void
856	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1349	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
857	SV * fh	1350	SV * fh
…		…
862	SV * callback	1355	SV * callback
863	ALIAS:	1356	ALIAS:
864	aio_read = REQ_READ	1357	aio_read = REQ_READ
865	aio_write = REQ_WRITE	1358	aio_write = REQ_WRITE
866	PROTOTYPE: $$$$$;$	1359	PROTOTYPE: $$$$$;$
867	CODE:	1360	PPCODE:
868	{	1361	{
869	aio_req req;
870	STRLEN svlen;	1362	STRLEN svlen;
871	char *svptr = SvPVbyte (data, svlen);	1363	char *svptr = SvPVbyte (data, svlen);
872		1364
873	SvUPGRADE (data, SVt_PV);	1365	SvUPGRADE (data, SVt_PV);
874	SvPOK_on (data);	1366	SvPOK_on (data);
…		…
896		1388
897	{	1389	{
898	dREQ;	1390	dREQ;
899		1391
900	req->type = ix;	1392	req->type = ix;
901	req->fh = newSVsv (fh);	1393	req->fh = newSVsv (fh);
902	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1394	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
903	: IoOFP (sv_2io (fh)));	1395	: IoOFP (sv_2io (fh)));
904	req->offset = offset;	1396	req->offs = offset;
905	req->length = length;	1397	req->size = length;
906	req->data = SvREFCNT_inc (data);	1398	req->sv1 = SvREFCNT_inc (data);
907	req->dataptr = (char *)svptr + dataoffset;	1399	req->ptr1 = (char *)svptr + dataoffset;
		1400	req->stroffset = dataoffset;
908		1401
909	if (!SvREADONLY (data))	1402	if (!SvREADONLY (data))
910	{	1403	{
911	SvREADONLY_on (data);	1404	SvREADONLY_on (data);
912	req->data2ptr = (void *)data;	1405	req->flags |= FLAG_DATA_RO_OFF;
913	}	1406	}
914		1407
915	send_req (req);	1408	REQ_SEND;
916	}	1409	}
		1410	}
		1411
		1412	void
		1413	aio_readlink (path,callback=&PL_sv_undef)
		1414	SV * path
		1415	SV * callback
		1416	PROTOTYPE: $$;$
		1417	PPCODE:
		1418	{
		1419	SV *data;
		1420	dREQ;
		1421
		1422	data = newSV (NAME_MAX);
		1423	SvPOK_on (data);
		1424
		1425	req->type = REQ_READLINK;
		1426	req->fh = newSVsv (path);
		1427	req->ptr2 = SvPVbyte_nolen (path);
		1428	req->sv1 = data;
		1429	req->ptr1 = SvPVbyte_nolen (data);
		1430
		1431	REQ_SEND;
917	}	1432	}
918		1433
919	void	1434	void
920	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	1435	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
921	SV * out_fh	1436	SV * out_fh
922	SV * in_fh	1437	SV * in_fh
923	UV in_offset	1438	UV in_offset
924	UV length	1439	UV length
925	SV * callback	1440	SV * callback
926	PROTOTYPE: $$$$;$	1441	PROTOTYPE: $$$$;$
927	CODE:	1442	PPCODE:
928	{	1443	{
929	dREQ;	1444	dREQ;
930		1445
931	req->type = REQ_SENDFILE;	1446	req->type = REQ_SENDFILE;
932	req->fh = newSVsv (out_fh);	1447	req->fh = newSVsv (out_fh);
933	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1448	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
934	req->fh2 = newSVsv (in_fh);	1449	req->sv2 = newSVsv (in_fh);
935	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1450	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
936	req->offset = in_offset;	1451	req->offs = in_offset;
937	req->length = length;	1452	req->size = length;
938		1453
939	send_req (req);	1454	REQ_SEND;
940	}	1455	}
941		1456
942	void	1457	void
943	aio_readahead (fh,offset,length,callback=&PL_sv_undef)	1458	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
944	SV * fh	1459	SV * fh
945	UV offset	1460	UV offset
946	IV length	1461	IV length
947	SV * callback	1462	SV * callback
948	PROTOTYPE: $$$;$	1463	PROTOTYPE: $$$;$
949	CODE:	1464	PPCODE:
950	{	1465	{
951	dREQ;	1466	dREQ;
952		1467
953	req->type = REQ_READAHEAD;	1468	req->type = REQ_READAHEAD;
954	req->fh = newSVsv (fh);	1469	req->fh = newSVsv (fh);
955	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1470	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
956	req->offset = offset;	1471	req->offs = offset;
957	req->length = length;	1472	req->size = length;
958		1473
959	send_req (req);	1474	REQ_SEND;
960	}	1475	}
961		1476
962	void	1477	void
963	aio_stat (fh_or_path,callback=&PL_sv_undef)	1478	aio_stat (fh_or_path,callback=&PL_sv_undef)
964	SV * fh_or_path	1479	SV * fh_or_path
965	SV * callback	1480	SV * callback
966	ALIAS:	1481	ALIAS:
967	aio_stat = REQ_STAT	1482	aio_stat = REQ_STAT
968	aio_lstat = REQ_LSTAT	1483	aio_lstat = REQ_LSTAT
969	CODE:	1484	PPCODE:
970	{	1485	{
971	dREQ;	1486	dREQ;
972		1487
973	New (0, req->statdata, 1, Stat_t);	1488	New (0, req->statdata, 1, Stat_t);
974	if (!req->statdata)	1489	if (!req->statdata)
975	{	1490	{
976	free_req (req);	1491	req_free (req);
977	croak ("out of memory during aio_req->statdata allocation");	1492	croak ("out of memory during aio_req->statdata allocation");
978	}	1493	}
979		1494
980	if (SvPOK (fh_or_path))	1495	if (SvPOK (fh_or_path))
981	{	1496	{
982	req->type = ix;	1497	req->type = ix;
983	req->data = newSVsv (fh_or_path);	1498	req->sv1 = newSVsv (fh_or_path);
984	req->dataptr = SvPVbyte_nolen (req->data);	1499	req->ptr1 = SvPVbyte_nolen (fh_or_path);
985	}	1500	}
986	else	1501	else
987	{	1502	{
988	req->type = REQ_FSTAT;	1503	req->type = REQ_FSTAT;
989	req->fh = newSVsv (fh_or_path);	1504	req->fh = newSVsv (fh_or_path);
990	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1505	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
991	}	1506	}
992		1507
993	send_req (req);	1508	REQ_SEND;
994	}	1509	}
995		1510
996	void	1511	void
997	aio_unlink (pathname,callback=&PL_sv_undef)	1512	aio_unlink (pathname,callback=&PL_sv_undef)
998	SV * pathname	1513	SV * pathname
999	SV * callback	1514	SV * callback
1000	ALIAS:	1515	ALIAS:
1001	aio_unlink = REQ_UNLINK	1516	aio_unlink = REQ_UNLINK
1002	aio_rmdir = REQ_RMDIR	1517	aio_rmdir = REQ_RMDIR
1003	aio_readdir = REQ_READDIR	1518	aio_readdir = REQ_READDIR
1004	CODE:	1519	PPCODE:
1005	{	1520	{
1006	dREQ;	1521	dREQ;
1007		1522
1008	req->type = ix;	1523	req->type = ix;
1009	req->data = newSVsv (pathname);	1524	req->sv1 = newSVsv (pathname);
1010	req->dataptr = SvPVbyte_nolen (req->data);	1525	req->ptr1 = SvPVbyte_nolen (pathname);
1011		1526
1012	send_req (req);	1527	REQ_SEND;
1013	}	1528	}
1014		1529
1015	void	1530	void
1016	aio_link (oldpath,newpath,callback=&PL_sv_undef)	1531	aio_link (oldpath,newpath,callback=&PL_sv_undef)
1017	SV * oldpath	1532	SV * oldpath
1018	SV * newpath	1533	SV * newpath
1019	SV * callback	1534	SV * callback
1020	ALIAS:	1535	ALIAS:
1021	aio_link = REQ_LINK	1536	aio_link = REQ_LINK
1022	aio_symlink = REQ_SYMLINK	1537	aio_symlink = REQ_SYMLINK
1023	aio_rename = REQ_RENAME	1538	aio_rename = REQ_RENAME
1024	CODE:	1539	PPCODE:
1025	{	1540	{
1026	dREQ;	1541	dREQ;
1027		1542
1028	req->type = ix;	1543	req->type = ix;
1029	req->fh = newSVsv (oldpath);	1544	req->fh = newSVsv (oldpath);
1030	req->data2ptr = SvPVbyte_nolen (req->fh);	1545	req->ptr2 = SvPVbyte_nolen (req->fh);
1031	req->data = newSVsv (newpath);	1546	req->sv1 = newSVsv (newpath);
1032	req->dataptr = SvPVbyte_nolen (req->data);	1547	req->ptr1 = SvPVbyte_nolen (newpath);
1033		1548
1034	send_req (req);	1549	REQ_SEND;
1035	}	1550	}
1036		1551
1037	#if 0
1038
1039	# undocumented, because it does not cancel active requests
1040	void	1552	void
1041	cancel_most_requests ()	1553	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
		1554	SV * pathname
		1555	SV * callback
		1556	UV mode
		1557	UV dev
		1558	PPCODE:
		1559	{
		1560	dREQ;
		1561
		1562	req->type = REQ_MKNOD;
		1563	req->sv1 = newSVsv (pathname);
		1564	req->ptr1 = SvPVbyte_nolen (pathname);
		1565	req->mode = (mode_t)mode;
		1566	req->offs = dev;
		1567
		1568	REQ_SEND;
		1569	}
		1570
		1571	void
		1572	aio_busy (delay,callback=&PL_sv_undef)
		1573	double delay
		1574	SV * callback
		1575	PPCODE:
		1576	{
		1577	dREQ;
		1578
		1579	req->type = REQ_BUSY;
		1580	req->int1 = delay < 0. ? 0 : delay;
		1581	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
		1582
		1583	REQ_SEND;
		1584	}
		1585
		1586	void
		1587	aio_group (callback=&PL_sv_undef)
		1588	SV * callback
1042	PROTOTYPE:	1589	PROTOTYPE: ;$
1043	CODE:	1590	PPCODE:
1044	{	1591	{
1045	aio_req *req;	1592	dREQ;
1046		1593
1047	pthread_mutex_lock (&reqlock);	1594	req->type = REQ_GROUP;
1048	for (req = reqs; req; req = req->next)
1049	req->flags |= 1;
1050	pthread_mutex_unlock (&reqlock);
1051		1595
1052	pthread_mutex_lock (&reslock);	1596	req_send (req);
1053	for (req = ress; req; req = req->next)	1597	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1054	req->flags |= 1;
1055	pthread_mutex_unlock (&reslock);
1056	}	1598	}
1057		1599
1058	#endif	1600	void
		1601	aio_nop (callback=&PL_sv_undef)
		1602	SV * callback
		1603	PPCODE:
		1604	{
		1605	dREQ;
		1606
		1607	req->type = REQ_NOP;
		1608
		1609	REQ_SEND;
		1610	}
		1611
		1612	int
		1613	aioreq_pri (int pri = 0)
		1614	PROTOTYPE: ;$
		1615	CODE:
		1616	RETVAL = next_pri - PRI_BIAS;
		1617	if (items > 0)
		1618	{
		1619	if (pri < PRI_MIN) pri = PRI_MIN;
		1620	if (pri > PRI_MAX) pri = PRI_MAX;
		1621	next_pri = pri + PRI_BIAS;
		1622	}
		1623	OUTPUT:
		1624	RETVAL
		1625
		1626	void
		1627	aioreq_nice (int nice = 0)
		1628	CODE:
		1629	nice = next_pri - nice;
		1630	if (nice < PRI_MIN) nice = PRI_MIN;
		1631	if (nice > PRI_MAX) nice = PRI_MAX;
		1632	next_pri = nice + PRI_BIAS;
1059		1633
1060	void	1634	void
1061	flush ()	1635	flush ()
1062	PROTOTYPE:	1636	PROTOTYPE:
1063	CODE:	1637	CODE:
1064	while (nreqs)	1638	while (nreqs)
1065	{	1639	{
1066	poll_wait ();	1640	poll_wait ();
1067	poll_cb ();	1641	poll_cb (0);
1068	}	1642	}
1069		1643
1070	void	1644	void
1071	poll()	1645	poll()
1072	PROTOTYPE:	1646	PROTOTYPE:
1073	CODE:	1647	CODE:
1074	if (nreqs)	1648	if (nreqs)
1075	{	1649	{
1076	poll_wait ();	1650	poll_wait ();
1077	poll_cb ();	1651	poll_cb (0);
1078	}	1652	}
1079		1653
1080	int	1654	int
1081	poll_fileno()	1655	poll_fileno()
1082	PROTOTYPE:	1656	PROTOTYPE:
…		…
1106	CODE:	1680	CODE:
1107	RETVAL = nreqs;	1681	RETVAL = nreqs;
1108	OUTPUT:	1682	OUTPUT:
1109	RETVAL	1683	RETVAL
1110		1684
		1685	int
		1686	nready()
		1687	PROTOTYPE:
		1688	CODE:
		1689	RETVAL = get_nready ();
		1690	OUTPUT:
		1691	RETVAL
		1692
		1693	int
		1694	npending()
		1695	PROTOTYPE:
		1696	CODE:
		1697	RETVAL = get_npending ();
		1698	OUTPUT:
		1699	RETVAL
		1700
		1701	int
		1702	nthreads()
		1703	PROTOTYPE:
		1704	CODE:
		1705	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1706	RETVAL = started;
		1707	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1708	OUTPUT:
		1709	RETVAL
		1710
		1711	PROTOTYPES: DISABLE
		1712
		1713	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1714
		1715	void
		1716	cancel (aio_req_ornot req)
		1717	CODE:
		1718	req_cancel (req);
		1719
		1720	void
		1721	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1722	CODE:
		1723	SvREFCNT_dec (req->callback);
		1724	req->callback = newSVsv (callback);
		1725
		1726	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1727
		1728	void
		1729	add (aio_req grp, ...)
		1730	PPCODE:
		1731	{
		1732	int i;
		1733	aio_req req;
		1734
		1735	if (grp->int1 == 2)
		1736	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1737
		1738	for (i = 1; i < items; ++i )
		1739	{
		1740	if (GIMME_V != G_VOID)
		1741	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1742
		1743	req = SvAIO_REQ (ST (i));
		1744
		1745	if (req)
		1746	{
		1747	++grp->size;
		1748	req->grp = grp;
		1749
		1750	req->grp_prev = 0;
		1751	req->grp_next = grp->grp_first;
		1752
		1753	if (grp->grp_first)
		1754	grp->grp_first->grp_prev = req;
		1755
		1756	grp->grp_first = req;
		1757	}
		1758	}
		1759	}
		1760
		1761	void
		1762	cancel_subs (aio_req_ornot req)
		1763	CODE:
		1764	req_cancel_subs (req);
		1765
		1766	void
		1767	result (aio_req grp, ...)
		1768	CODE:
		1769	{
		1770	int i;
		1771	AV *av;
		1772
		1773	grp->errorno = errno;
		1774
		1775	av = newAV ();
		1776
		1777	for (i = 1; i < items; ++i )
		1778	av_push (av, newSVsv (ST (i)));
		1779
		1780	SvREFCNT_dec (grp->sv1);
		1781	grp->sv1 = (SV *)av;
		1782	}
		1783
		1784	void
		1785	errno (aio_req grp, int errorno = errno)
		1786	CODE:
		1787	grp->errorno = errorno;
		1788
		1789	void
		1790	limit (aio_req grp, int limit)
		1791	CODE:
		1792	grp->int2 = limit;
		1793	aio_grp_feed (grp);
		1794
		1795	void
		1796	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1797	CODE:
		1798	{
		1799	SvREFCNT_dec (grp->sv2);
		1800	grp->sv2 = newSVsv (callback);
		1801
		1802	if (grp->int2 <= 0)
		1803	grp->int2 = 2;
		1804
		1805	aio_grp_feed (grp);
		1806	}
		1807

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