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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.40 by root, Sat Jun 24 16:27:02 2006 UTC vs.
Revision 1.93 by root, Wed Nov 8 02:01:02 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"
…		…
8	#include "autoconf/config.h"	17	#include "autoconf/config.h"
9		18
10	#include <pthread.h>	19	#include <pthread.h>
11		20
12	#include <stddef.h>	21	#include <stddef.h>
		22	#include <errno.h>
		23	#include <sys/time.h>
		24	#include <sys/select.h>
13	#include <sys/types.h>	25	#include <sys/types.h>
14	#include <sys/stat.h>	26	#include <sys/stat.h>
15	#include <limits.h>	27	#include <limits.h>
16	#include <unistd.h>	28	#include <unistd.h>
17	#include <fcntl.h>	29	#include <fcntl.h>
…		…
31	# else	43	# else
32	# error sendfile support requested but not available	44	# error sendfile support requested but not available
33	# endif	45	# endif
34	#endif	46	#endif
35		47
		48	/* number of seconds after which idle threads exit */
		49	#define IDLE_TIMEOUT 10
		50
36	/* used for struct dirent, AIX doesn't provide it */	51	/* used for struct dirent, AIX doesn't provide it */
37	#ifndef NAME_MAX	52	#ifndef NAME_MAX
38	# define NAME_MAX 4096	53	# define NAME_MAX 4096
39	#endif	54	#endif
40		55
		56	#ifndef PTHREAD_STACK_MIN
		57	/* care for broken platforms, e.g. windows */
		58	# define PTHREAD_STACK_MIN 16384
		59	#endif
		60
41	#if __ia64	61	#if __ia64
42	# define STACKSIZE 65536	62	# define STACKSIZE 65536
		63	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		64	# define STACKSIZE PTHREAD_STACK_MIN
43	#else	65	#else
44	# define STACKSIZE 8192	66	# define STACKSIZE 16384
45	#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 */
46		93
47	enum {	94	enum {
48	REQ_QUIT,	95	REQ_QUIT,
49	REQ_OPEN, REQ_CLOSE,	96	REQ_OPEN, REQ_CLOSE,
50	REQ_READ, REQ_WRITE, REQ_READAHEAD,	97	REQ_READ, REQ_WRITE, REQ_READAHEAD,
51	REQ_SENDFILE,	98	REQ_SENDFILE,
52	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	99	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
53	REQ_FSYNC, REQ_FDATASYNC,	100	REQ_FSYNC, REQ_FDATASYNC,
54	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,	101	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
55	REQ_READDIR,	102	REQ_MKNOD, REQ_READDIR,
56	REQ_LINK, REQ_SYMLINK,	103	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		104	REQ_GROUP, REQ_NOP,
		105	REQ_BUSY,
57	};	106	};
58		107
		108	#define AIO_REQ_KLASS "IO::AIO::REQ"
		109	#define AIO_GRP_KLASS "IO::AIO::GRP"
		110
59	typedef struct aio_cb {	111	typedef struct aio_cb
		112	{
60	struct aio_cb *volatile next;	113	struct aio_cb *volatile next;
61		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;
62	int type;	123	int type;
63		124	int int1, int2;
64	/* should receive a cleanup, with unions */	125	int errorno;
65	int fd, fd2;
66	off_t offset;
67	size_t length;
68	ssize_t result;
69	mode_t mode; /* open */	126	mode_t mode; /* open */
70	int errorno;
71	SV *data, *callback;
72	SV *fh, *fh2;
73	void *dataptr, *data2ptr;
74	STRLEN dataoffset;
75		127
76	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;
77	} aio_cb;	133	} aio_cb;
78		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
79	typedef aio_cb *aio_req;	141	typedef aio_cb *aio_req;
		142	typedef aio_cb *aio_req_ornot;
80		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
81	static int started, wanted;	167	static unsigned int started, idle, wanted;
82	static volatile int nreqs;	168
83	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;
84	static int respipe [2];	221	static int respipe [2];
85		222
86	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	223	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
87	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	224	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
88	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	225	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
89		226
90	static volatile aio_req reqs, reqe; /* queue start, queue end */	227	#if WORDACCESS_UNSAFE
91	static volatile aio_req ress, rese; /* queue start, queue end */
92		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 = POPs;
		453	PUSHMARK (SP);
		454	XPUSHs (fh);
		455	}
		456	break;
		457
		458	case REQ_GROUP:
		459	req->int1 = 2; /* mark group as finished */
		460
		461	if (req->sv1)
		462	{
		463	int i;
		464	AV *av = (AV *)req->sv1;
		465
		466	EXTEND (SP, AvFILL (av) + 1);
		467	for (i = 0; i <= AvFILL (av); ++i)
		468	PUSHs (*av_fetch (av, i, 0));
		469	}
		470	break;
		471
		472	case REQ_NOP:
		473	case REQ_BUSY:
		474	break;
		475
		476	case REQ_READLINK:
		477	if (req->result > 0)
		478	{
		479	SvCUR_set (req->sv1, req->result);
		480	*SvEND (req->sv1) = 0;
		481	PUSHs (req->sv1);
		482	}
		483	break;
		484
		485	case REQ_STAT:
		486	case REQ_LSTAT:
		487	case REQ_FSTAT:
		488	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		489	PL_laststatval = req->result;
		490	PL_statcache = *(Stat_t *)(req->ptr2);
		491	PUSHs (sv_2mortal (newSViv (req->result)));
		492	break;
		493
		494	case REQ_READ:
		495	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		496	*SvEND (req->sv1) = 0;
		497	PUSHs (sv_2mortal (newSViv (req->result)));
		498	break;
		499
		500	default:
		501	PUSHs (sv_2mortal (newSViv (req->result)));
		502	break;
		503	}
		504
		505	errno = req->errorno;
		506
		507	PUTBACK;
		508	call_sv (req->callback, G_VOID | G_EVAL);
		509	SPAGAIN;
		510
		511	FREETMPS;
		512	LEAVE;
		513	}
		514
		515	if (req->grp)
		516	{
		517	aio_req grp = req->grp;
		518
		519	/* unlink request */
		520	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		521	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		522
		523	if (grp->grp_first == req)
		524	grp->grp_first = req->grp_next;
		525
		526	aio_grp_dec (grp);
		527	}
		528
		529	if (SvTRUE (ERRSV))
		530	{
		531	req_free (req);
		532	croak (0);
		533	}
		534	}
		535
93	static void free_req (aio_req req)	536	static void req_free (aio_req req)
94	{	537	{
95	if (req->data)
96	SvREFCNT_dec (req->data);
97
98	if (req->fh)	538	if (req->self)
		539	{
		540	sv_unmagic (req->self, PERL_MAGIC_ext);
		541	SvREFCNT_dec (req->self);
		542	}
		543
99	SvREFCNT_dec (req->fh);	544	SvREFCNT_dec (req->fh);
100		545	SvREFCNT_dec (req->sv1);
101	if (req->fh2)
102	SvREFCNT_dec (req->fh2);	546	SvREFCNT_dec (req->sv2);
103
104	if (req->statdata)
105	Safefree (req->statdata);
106
107	if (req->callback)
108	SvREFCNT_dec (req->callback);	547	SvREFCNT_dec (req->callback);
109		548
110	if (req->type == REQ_READDIR && req->result >= 0)	549	if (req->flags & FLAG_PTR2_FREE)
111	free (req->data2ptr);	550	free (req->ptr2);
112		551
113	Safefree (req);	552	Safefree (req);
114	}	553	}
115		554
116	static void	555	static void req_cancel_subs (aio_req grp)
117	poll_wait ()
118	{	556	{
119	if (nreqs && !ress)	557	aio_req sub;
		558
		559	if (grp->type != REQ_GROUP)
		560	return;
		561
		562	SvREFCNT_dec (grp->sv2);
		563	grp->sv2 = 0;
		564
		565	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		566	req_cancel (sub);
		567	}
		568
		569	static void req_cancel (aio_req req)
		570	{
		571	req->flags |= FLAG_CANCELLED;
		572
		573	req_cancel_subs (req);
		574	}
		575
		576	static void *aio_proc(void *arg);
		577
		578	static void start_thread (void)
		579	{
		580	sigset_t fullsigset, oldsigset;
		581	pthread_attr_t attr;
		582
		583	worker *wrk = calloc (1, sizeof (worker));
		584
		585	if (!wrk)
		586	croak ("unable to allocate worker thread data");
		587
		588	pthread_attr_init (&attr);
		589	pthread_attr_setstacksize (&attr, STACKSIZE);
		590	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		591	#ifdef PTHREAD_SCOPE_PROCESS
		592	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		593	#endif
		594
		595	sigfillset (&fullsigset);
		596
		597	LOCK (wrklock);
		598	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
		599
		600	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
120	{	601	{
		602	wrk->prev = &wrk_first;
		603	wrk->next = wrk_first.next;
		604	wrk_first.next->prev = wrk;
		605	wrk_first.next = wrk;
		606	++started;
		607	}
		608	else
		609	free (wrk);
		610
		611	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		612	UNLOCK (wrklock);
		613	}
		614
		615	static void maybe_start_thread ()
		616	{
		617	if (get_nthreads () >= wanted)
		618	return;
		619
		620	/* todo: maybe use idle here, but might be less exact */
		621	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		622	return;
		623
		624	start_thread ();
		625	}
		626
		627	static void req_send (aio_req req)
		628	{
		629	++nreqs;
		630
		631	LOCK (reqlock);
		632	++nready;
		633	reqq_push (&req_queue, req);
		634	pthread_cond_signal (&reqwait);
		635	UNLOCK (reqlock);
		636
		637	maybe_start_thread ();
		638	}
		639
		640	static void end_thread (void)
		641	{
		642	aio_req req;
		643
		644	Newz (0, req, 1, aio_cb);
		645
		646	req->type = REQ_QUIT;
		647	req->pri = PRI_MAX + PRI_BIAS;
		648
		649	LOCK (reqlock);
		650	reqq_push (&req_queue, req);
		651	pthread_cond_signal (&reqwait);
		652	UNLOCK (reqlock);
		653
		654	LOCK (wrklock);
		655	--started;
		656	UNLOCK (wrklock);
		657	}
		658
		659	static void set_max_idle (int nthreads)
		660	{
		661	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		662	max_idle = nthreads <= 0 ? 1 : nthreads;
		663	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
		664	}
		665
		666	static void min_parallel (int nthreads)
		667	{
		668	if (wanted < nthreads)
		669	wanted = nthreads;
		670	}
		671
		672	static void max_parallel (int nthreads)
		673	{
		674	if (wanted > nthreads)
		675	wanted = nthreads;
		676
		677	while (started > wanted)
		678	end_thread ();
		679	}
		680
		681	static void poll_wait ()
		682	{
121	fd_set rfd;	683	fd_set rfd;
		684
		685	while (nreqs)
		686	{
		687	int size;
		688	if (WORDACCESS_UNSAFE) LOCK (reslock);
		689	size = res_queue.size;
		690	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		691
		692	if (size)
		693	return;
		694
		695	maybe_start_thread ();
		696
122	FD_ZERO(&rfd);	697	FD_ZERO(&rfd);
123	FD_SET(respipe [0], &rfd);	698	FD_SET(respipe [0], &rfd);
124		699
125	select (respipe [0] + 1, &rfd, 0, 0, 0);	700	select (respipe [0] + 1, &rfd, 0, 0, 0);
126	}	701	}
127	}	702	}
128		703
129	static int	704	static int poll_cb ()
130	poll_cb ()
131	{	705	{
132	dSP;	706	dSP;
133	int count = 0;	707	int count = 0;
		708	int maxreqs = max_poll_reqs;
134	int do_croak = 0;	709	int do_croak = 0;
		710	struct timeval tv_start, tv_now;
135	aio_req req;	711	aio_req req;
		712
		713	if (max_poll_time)
		714	gettimeofday (&tv_start, 0);
136		715
137	for (;;)	716	for (;;)
138	{	717	{
139	pthread_mutex_lock (&reslock);	718	for (;;)
140	req = ress;
141
142	if (req)
143	{	719	{
144	ress = req->next;	720	maybe_start_thread ();
145		721
		722	LOCK (reslock);
		723	req = reqq_shift (&res_queue);
		724
146	if (!ress)	725	if (req)
147	{	726	{
		727	--npending;
		728
		729	if (!res_queue.size)
		730	{
148	/* read any signals sent by the worker threads */	731	/* read any signals sent by the worker threads */
149	char buf [32];	732	char buf [32];
150	while (read (respipe [0], buf, 32) == 32)	733	while (read (respipe [0], buf, 32) == 32)
		734	;
151	;	735	}
152
153	rese = 0;
154	}	736	}
155	}
156		737
157	pthread_mutex_unlock (&reslock);	738	UNLOCK (reslock);
158		739
159	if (!req)	740	if (!req)
160	break;	741	break;
161		742
162	nreqs--;	743	--nreqs;
163		744
164	if (req->type == REQ_QUIT)
165	started--;
166	else
167	{
168	int errorno = errno;
169	errno = req->errorno;
170
171	if (req->type == REQ_READ)	745	if (req->type == REQ_GROUP && req->size)
172	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
173
174	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
175	SvREADONLY_off (req->data);
176
177	if (req->statdata)
178	{	746	{
179	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	747	req->int1 = 1; /* mark request as delayed */
180	PL_laststatval = req->result;	748	continue;
181	PL_statcache = *(req->statdata);
182	}
183
184	ENTER;
185	PUSHMARK (SP);
186
187	if (req->type == REQ_READDIR)
188	{
189	SV *rv = &PL_sv_undef;
190
191	if (req->result >= 0)
192	{
193	char *buf = req->data2ptr;
194	AV *av = newAV ();
195
196	while (req->result)
197	{
198	SV *sv = newSVpv (buf, 0);
199
200	av_push (av, sv);
201	buf += SvCUR (sv) + 1;
202	req->result--;
203	}
204
205	rv = sv_2mortal (newRV_noinc ((SV *)av));
206	}
207
208	XPUSHs (rv);
209	}	749	}
210	else	750	else
211	{	751	{
212	XPUSHs (sv_2mortal (newSViv (req->result)));	752	req_invoke (req);
213		753
214	if (req->type == REQ_OPEN)	754	count++;
215	{
216	/* convert fd to fh */
217	SV *fh;
218
219	PUTBACK;
220	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
221	SPAGAIN;
222
223	fh = SvREFCNT_inc (POPs);
224
225	PUSHMARK (SP);
226	XPUSHs (sv_2mortal (fh));
227	}
228	}	755	}
229		756
230	if (SvOK (req->callback))	757	req_free (req);
		758
		759	if (maxreqs && !--maxreqs)
		760	break;
		761
		762	if (max_poll_time)
231	{	763	{
232	PUTBACK;	764	gettimeofday (&tv_now, 0);
233	call_sv (req->callback, G_VOID | G_EVAL);
234	SPAGAIN;
235		765
236	if (SvTRUE (ERRSV))	766	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
237	{	767	break;
238	free_req (req);
239	croak (0);
240	}
241	}	768	}
242
243	LEAVE;
244
245	errno = errorno;
246	count++;
247	}	769	}
248		770
249	free_req (req);	771	if (nreqs <= max_outstanding)
		772	break;
		773
		774	poll_wait ();
		775
		776	++maxreqs;
250	}	777	}
251		778
252	return count;	779	return count;
253	}
254
255	static void *aio_proc(void *arg);
256
257	static void
258	start_thread (void)
259	{
260	sigset_t fullsigset, oldsigset;
261	pthread_t tid;
262	pthread_attr_t attr;
263
264	pthread_attr_init (&attr);
265	pthread_attr_setstacksize (&attr, STACKSIZE);
266	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
267
268	sigfillset (&fullsigset);
269	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
270
271	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
272	started++;
273
274	sigprocmask (SIG_SETMASK, &oldsigset, 0);
275	}
276
277	static void
278	send_req (aio_req req)
279	{
280	while (started < wanted && nreqs >= started)
281	start_thread ();
282
283	nreqs++;
284
285	pthread_mutex_lock (&reqlock);
286
287	req->next = 0;
288
289	if (reqe)
290	{
291	reqe->next = req;
292	reqe = req;
293	}
294	else
295	reqe = reqs = req;
296
297	pthread_cond_signal (&reqwait);
298	pthread_mutex_unlock (&reqlock);
299
300	if (nreqs > max_outstanding)
301	for (;;)
302	{
303	poll_cb ();
304
305	if (nreqs <= max_outstanding)
306	break;
307
308	poll_wait ();
309	}
310	}
311
312	static void
313	end_thread (void)
314	{
315	aio_req req;
316	Newz (0, req, 1, aio_cb);
317	req->type = REQ_QUIT;
318
319	send_req (req);
320	}
321
322	static void min_parallel (int nthreads)
323	{
324	if (wanted < nthreads)
325	wanted = nthreads;
326	}
327
328	static void max_parallel (int nthreads)
329	{
330	int cur = started;
331
332	if (wanted > nthreads)
333	wanted = nthreads;
334
335	while (cur > wanted)
336	{
337	end_thread ();
338	cur--;
339	}
340
341	while (started > wanted)
342	{
343	poll_wait ();
344	poll_cb ();
345	}
346	}	780	}
347		781
348	static void create_pipe ()	782	static void create_pipe ()
349	{	783	{
350	if (pipe (respipe))	784	if (pipe (respipe))
…		…
369	* normal read/write by using a mutex. slows down execution a lot,	803	* normal read/write by using a mutex. slows down execution a lot,
370	* but that's your problem, not mine.	804	* but that's your problem, not mine.
371	*/	805	*/
372	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;	806	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
373		807
374	static ssize_t	808	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
375	pread (int fd, void *buf, size_t count, off_t offset)
376	{	809	{
377	ssize_t res;	810	ssize_t res;
378	off_t ooffset;	811	off_t ooffset;
379		812
380	pthread_mutex_lock (&preadwritelock);	813	LOCK (preadwritelock);
381	ooffset = lseek (fd, 0, SEEK_CUR);	814	ooffset = lseek (fd, 0, SEEK_CUR);
382	lseek (fd, offset, SEEK_SET);	815	lseek (fd, offset, SEEK_SET);
383	res = read (fd, buf, count);	816	res = read (fd, buf, count);
384	lseek (fd, ooffset, SEEK_SET);	817	lseek (fd, ooffset, SEEK_SET);
385	pthread_mutex_unlock (&preadwritelock);	818	UNLOCK (preadwritelock);
386		819
387	return res;	820	return res;
388	}	821	}
389		822
390	static ssize_t
391	pwrite (int fd, void *buf, size_t count, off_t offset)	823	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
392	{	824	{
393	ssize_t res;	825	ssize_t res;
394	off_t ooffset;	826	off_t ooffset;
395		827
396	pthread_mutex_lock (&preadwritelock);	828	LOCK (preadwritelock);
397	ooffset = lseek (fd, 0, SEEK_CUR);	829	ooffset = lseek (fd, 0, SEEK_CUR);
398	lseek (fd, offset, SEEK_SET);	830	lseek (fd, offset, SEEK_SET);
399	res = write (fd, buf, count);	831	res = write (fd, buf, count);
400	lseek (fd, offset, SEEK_SET);	832	lseek (fd, offset, SEEK_SET);
401	pthread_mutex_unlock (&preadwritelock);	833	UNLOCK (preadwritelock);
402		834
403	return res;	835	return res;
404	}	836	}
405	#endif	837	#endif
406		838
407	#if !HAVE_FDATASYNC	839	#if !HAVE_FDATASYNC
408	# define fdatasync fsync	840	# define fdatasync fsync
409	#endif	841	#endif
410		842
411	#if !HAVE_READAHEAD	843	#if !HAVE_READAHEAD
412	# define readahead aio_readahead	844	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
413		845
414	static ssize_t	846	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
415	readahead (int fd, off_t offset, size_t count)
416	{	847	{
417	char readahead_buf[4096];	848	dBUF;
418		849
419	while (count > 0)	850	while (count > 0)
420	{	851	{
421	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	852	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
422		853
423	pread (fd, readahead_buf, len, offset);	854	pread (fd, aio_buf, len, offset);
424	offset += len;	855	offset += len;
425	count -= len;	856	count -= len;
426	}	857	}
427		858
428	errno = 0;	859	errno = 0;
429	}	860	}
		861
430	#endif	862	#endif
431		863
432	#if !HAVE_READDIR_R	864	#if !HAVE_READDIR_R
433	# define readdir_r aio_readdir_r	865	# define readdir_r aio_readdir_r
434		866
435	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;	867	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
436		868
437	static int
438	readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)	869	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
439	{	870	{
440	struct dirent *e;	871	struct dirent *e;
441	int errorno;	872	int errorno;
442		873
443	pthread_mutex_lock (&readdirlock);	874	LOCK (readdirlock);
444		875
445	e = readdir (dirp);	876	e = readdir (dirp);
446	errorno = errno;	877	errorno = errno;
447		878
448	if (e)	879	if (e)
…		…
451	strcpy (ent->d_name, e->d_name);	882	strcpy (ent->d_name, e->d_name);
452	}	883	}
453	else	884	else
454	*res = 0;	885	*res = 0;
455		886
456	pthread_mutex_unlock (&readdirlock);	887	UNLOCK (readdirlock);
457		888
458	errno = errorno;	889	errno = errorno;
459	return e ? 0 : -1;	890	return e ? 0 : -1;
460	}	891	}
461	#endif	892	#endif
462		893
463	/* sendfile always needs emulation */	894	/* sendfile always needs emulation */
464	static ssize_t
465	sendfile_ (int ofd, int ifd, off_t offset, size_t count)	895	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
466	{	896	{
467	ssize_t res;	897	ssize_t res;
468		898
469	if (!count)	899	if (!count)
470	return 0;	900	return 0;
…		…
481	{	911	{
482	off_t sbytes;	912	off_t sbytes;
483	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	913	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
484		914
485	if (res < 0 && sbytes)	915	if (res < 0 && sbytes)
486	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	916	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
487	res = sbytes;	917	res = sbytes;
488	}	918	}
489		919
490	# elif __hpux	920	# elif __hpux
491	res = sendfile (ofd, ifd, offset, count, 0, 0);	921	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
519	#endif	949	#endif
520	)	950	)
521	)	951	)
522	{	952	{
523	/* emulate sendfile. this is a major pain in the ass */	953	/* emulate sendfile. this is a major pain in the ass */
524	char buf[4096];	954	dBUF;
		955
525	res = 0;	956	res = 0;
526		957
527	while (count)	958	while (count)
528	{	959	{
529	ssize_t cnt;	960	ssize_t cnt;
530		961
531	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	962	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
532		963
533	if (cnt <= 0)	964	if (cnt <= 0)
534	{	965	{
535	if (cnt && !res) res = -1;	966	if (cnt && !res) res = -1;
536	break;	967	break;
537	}	968	}
538		969
539	cnt = write (ofd, buf, cnt);	970	cnt = write (ofd, aio_buf, cnt);
540		971
541	if (cnt <= 0)	972	if (cnt <= 0)
542	{	973	{
543	if (cnt && !res) res = -1;	974	if (cnt && !res) res = -1;
544	break;	975	break;
…		…
552		983
553	return res;	984	return res;
554	}	985	}
555		986
556	/* read a full directory */	987	/* read a full directory */
557	static int	988	static void scandir_ (aio_req req, worker *self)
558	scandir_ (const char *path, void **namesp)
559	{	989	{
560	DIR *dirp = opendir (path);	990	DIR *dirp;
561	union	991	union
562	{	992	{
563	struct dirent d;	993	struct dirent d;
564	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	994	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
565	} u;	995	} *u;
566	struct dirent *entp;	996	struct dirent *entp;
567	char *name, *names;	997	char *name, *names;
568	int memlen = 4096;	998	int memlen = 4096;
569	int memofs = 0;	999	int memofs = 0;
570	int res = 0;	1000	int res = 0;
571	int errorno;	1001	int errorno;
572		1002
573	if (!dirp)	1003	LOCK (wrklock);
574	return -1;	1004	self->dirp = dirp = opendir (req->ptr1);
575		1005	self->dbuf = u = malloc (sizeof (*u));
		1006	req->flags |= FLAG_PTR2_FREE;
576	names = malloc (memlen);	1007	req->ptr2 = names = malloc (memlen);
		1008	UNLOCK (wrklock);
		1009
		1010	if (dirp && u && names)
		1011	for (;;)
		1012	{
		1013	errno = 0;
		1014	readdir_r (dirp, &u->d, &entp);
		1015
		1016	if (!entp)
		1017	break;
		1018
		1019	name = entp->d_name;
		1020
		1021	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1022	{
		1023	int len = strlen (name) + 1;
		1024
		1025	res++;
		1026
		1027	while (memofs + len > memlen)
		1028	{
		1029	memlen *= 2;
		1030	LOCK (wrklock);
		1031	req->ptr2 = names = realloc (names, memlen);
		1032	UNLOCK (wrklock);
		1033
		1034	if (!names)
		1035	break;
		1036	}
		1037
		1038	memcpy (names + memofs, name, len);
		1039	memofs += len;
		1040	}
		1041	}
		1042
		1043	if (errno)
		1044	res = -1;
		1045
		1046	req->result = res;
		1047	}
		1048
		1049	/*****************************************************************************/
		1050
		1051	static void *aio_proc (void *thr_arg)
		1052	{
		1053	aio_req req;
		1054	struct timespec ts;
		1055	worker *self = (worker *)thr_arg;
		1056
		1057	/* try to distribute timeouts somewhat evenly */
		1058	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1059	* (1000000000UL / 1024UL);
577		1060
578	for (;;)	1061	for (;;)
579	{	1062	{
580	errno = 0, readdir_r (dirp, &u.d, &entp);	1063	ts.tv_sec = time (0) + IDLE_TIMEOUT;
581		1064
582	if (!entp)	1065	LOCK (reqlock);
583	break;
584
585	name = entp->d_name;
586
587	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
588	{
589	int len = strlen (name) + 1;
590
591	res++;
592
593	while (memofs + len > memlen)
594	{
595	memlen *= 2;
596	names = realloc (names, memlen);
597	if (!names)
598	break;
599	}
600
601	memcpy (names + memofs, name, len);
602	memofs += len;
603	}
604	}
605
606	errorno = errno;
607	closedir (dirp);
608
609	if (errorno)
610	{
611	free (names);
612	errno = errorno;
613	res = -1;
614	}
615
616	*namesp = (void *)names;
617	return res;
618	}
619
620	/*****************************************************************************/
621
622	static void *
623	aio_proc (void *thr_arg)
624	{
625	aio_req req;
626	int type;
627
628	do
629	{
630	pthread_mutex_lock (&reqlock);
631		1066
632	for (;;)	1067	for (;;)
633	{	1068	{
634	req = reqs;	1069	self->req = req = reqq_shift (&req_queue);
635
636	if (reqs)
637	{
638	reqs = reqs->next;
639	if (!reqs) reqe = 0;
640	}
641		1070
642	if (req)	1071	if (req)
643	break;	1072	break;
644		1073
		1074	++idle;
		1075
		1076	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1077	== ETIMEDOUT)
		1078	{
		1079	if (idle > max_idle)
		1080	{
		1081	--idle;
		1082	UNLOCK (reqlock);
		1083	LOCK (wrklock);
		1084	--started;
		1085	UNLOCK (wrklock);
		1086	goto quit;
		1087	}
		1088
		1089	/* we are allowed to idle, so do so without any timeout */
645	pthread_cond_wait (&reqwait, &reqlock);	1090	pthread_cond_wait (&reqwait, &reqlock);
		1091	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1092	}
		1093
		1094	--idle;
646	}	1095	}
647		1096
648	pthread_mutex_unlock (&reqlock);	1097	--nready;
		1098
		1099	UNLOCK (reqlock);
649		1100
650	errno = 0; /* strictly unnecessary */	1101	errno = 0; /* strictly unnecessary */
651		1102
652	type = req->type;	1103	if (!(req->flags & FLAG_CANCELLED))
653
654	switch (type)	1104	switch (req->type)
655	{	1105	{
656	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	1106	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
657	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	1107	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
658		1108
659	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	1109	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
660	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;	1110	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
661		1111
662	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1112	case REQ_STAT: req->result = stat (req->ptr1, (Stat_t *)req->ptr2); break;
663	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1113	case REQ_LSTAT: req->result = lstat (req->ptr1, (Stat_t *)req->ptr2); break;
664	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1114	case REQ_FSTAT: req->result = fstat (req->int1, (Stat_t *)req->ptr2); break;
665		1115
666	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	1116	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
667	case REQ_CLOSE: req->result = close (req->fd); break;	1117	case REQ_CLOSE: req->result = close (req->int1); break;
668	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1118	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
669	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1119	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
670	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;	1120	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
671	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;	1121	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
672	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	1122	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1123	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1124	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
673		1125
674	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1126	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
675	case REQ_FSYNC: req->result = fsync (req->fd); break;	1127	case REQ_FSYNC: req->result = fsync (req->int1); break;
676	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;	1128	case REQ_READDIR: scandir_ (req, self); break;
677		1129
		1130	case REQ_BUSY:
		1131	{
		1132	struct timeval tv;
		1133
		1134	tv.tv_sec = req->int1;
		1135	tv.tv_usec = req->int2;
		1136
		1137	req->result = select (0, 0, 0, 0, &tv);
		1138	}
		1139
		1140	case REQ_GROUP:
		1141	case REQ_NOP:
		1142	break;
		1143
678	case REQ_QUIT:	1144	case REQ_QUIT:
679	break;	1145	goto quit;
680		1146
681	default:	1147	default:
682	req->result = ENOSYS;	1148	req->result = ENOSYS;
683	break;	1149	break;
684	}	1150	}
685		1151
686	req->errorno = errno;	1152	req->errorno = errno;
687		1153
688	pthread_mutex_lock (&reslock);	1154	LOCK (reslock);
689		1155
690	req->next = 0;	1156	++npending;
691		1157
692	if (rese)	1158	if (!reqq_push (&res_queue, req))
693	{
694	rese->next = req;
695	rese = req;
696	}
697	else
698	{
699	rese = ress = req;
700
701	/* write a dummy byte to the pipe so fh becomes ready */	1159	/* write a dummy byte to the pipe so fh becomes ready */
702	write (respipe [1], &respipe, 1);	1160	write (respipe [1], &respipe, 1);
703	}
704		1161
705	pthread_mutex_unlock (&reslock);	1162	self->req = 0;
		1163	worker_clear (self);
		1164
		1165	UNLOCK (reslock);
706	}	1166	}
707	while (type != REQ_QUIT);	1167
		1168	quit:
		1169	LOCK (wrklock);
		1170	worker_free (self);
		1171	UNLOCK (wrklock);
708		1172
709	return 0;	1173	return 0;
710	}	1174	}
711		1175
712	/*****************************************************************************/	1176	/*****************************************************************************/
713		1177
714	static void atfork_prepare (void)	1178	static void atfork_prepare (void)
715	{	1179	{
716	pthread_mutex_lock (&reqlock);	1180	LOCK (wrklock);
717	pthread_mutex_lock (&reslock);	1181	LOCK (reqlock);
		1182	LOCK (reslock);
718	#if !HAVE_PREADWRITE	1183	#if !HAVE_PREADWRITE
719	pthread_mutex_lock (&preadwritelock);	1184	LOCK (preadwritelock);
720	#endif	1185	#endif
721	#if !HAVE_READDIR_R	1186	#if !HAVE_READDIR_R
722	pthread_mutex_lock (&readdirlock);	1187	LOCK (readdirlock);
723	#endif	1188	#endif
724	}	1189	}
725		1190
726	static void atfork_parent (void)	1191	static void atfork_parent (void)
727	{	1192	{
728	#if !HAVE_READDIR_R	1193	#if !HAVE_READDIR_R
729	pthread_mutex_unlock (&readdirlock);	1194	UNLOCK (readdirlock);
730	#endif	1195	#endif
731	#if !HAVE_PREADWRITE	1196	#if !HAVE_PREADWRITE
732	pthread_mutex_unlock (&preadwritelock);	1197	UNLOCK (preadwritelock);
733	#endif	1198	#endif
734	pthread_mutex_unlock (&reslock);	1199	UNLOCK (reslock);
735	pthread_mutex_unlock (&reqlock);	1200	UNLOCK (reqlock);
		1201	UNLOCK (wrklock);
736	}	1202	}
737		1203
738	static void atfork_child (void)	1204	static void atfork_child (void)
739	{	1205	{
740	aio_req prv;	1206	aio_req prv;
741		1207
742	started = 0;	1208	while (prv = reqq_shift (&req_queue))
		1209	req_free (prv);
743		1210
744	while (reqs)	1211	while (prv = reqq_shift (&res_queue))
		1212	req_free (prv);
		1213
		1214	while (wrk_first.next != &wrk_first)
745	{	1215	{
746	prv = reqs;	1216	worker *wrk = wrk_first.next;
747	reqs = prv->next;	1217
748	free_req (prv);	1218	if (wrk->req)
		1219	req_free (wrk->req);
		1220
		1221	worker_clear (wrk);
		1222	worker_free (wrk);
749	}	1223	}
750		1224
751	reqs = reqe = 0;	1225	started = 0;
752		1226	idle = 0;
753	while (ress)	1227	nreqs = 0;
754	{	1228	nready = 0;
755	prv = ress;	1229	npending = 0;
756	ress = prv->next;
757	free_req (prv);
758	}
759
760	ress = rese = 0;
761		1230
762	close (respipe [0]);	1231	close (respipe [0]);
763	close (respipe [1]);	1232	close (respipe [1]);
764	create_pipe ();	1233	create_pipe ();
765		1234
766	atfork_parent ();	1235	atfork_parent ();
767	}	1236	}
768		1237
769	#define dREQ \	1238	#define dREQ \
770	aio_req req; \	1239	aio_req req; \
		1240	int req_pri = next_pri; \
		1241	next_pri = DEFAULT_PRI + PRI_BIAS; \
771	\	1242	\
772	if (SvOK (callback) && !SvROK (callback)) \	1243	if (SvOK (callback) && !SvROK (callback)) \
773	croak ("clalback must be undef or of reference type"); \	1244	croak ("callback must be undef or of reference type"); \
774	\	1245	\
775	Newz (0, req, 1, aio_cb); \	1246	Newz (0, req, 1, aio_cb); \
776	if (!req) \	1247	if (!req) \
777	croak ("out of memory during aio_req allocation"); \	1248	croak ("out of memory during aio_req allocation"); \
778	\	1249	\
779	req->callback = newSVsv (callback);	1250	req->callback = newSVsv (callback); \
		1251	req->pri = req_pri
		1252
		1253	#define REQ_SEND \
		1254	req_send (req); \
		1255	\
		1256	if (GIMME_V != G_VOID) \
		1257	XPUSHs (req_sv (req, AIO_REQ_KLASS));
780		1258
781	MODULE = IO::AIO PACKAGE = IO::AIO	1259	MODULE = IO::AIO PACKAGE = IO::AIO
782		1260
783	PROTOTYPES: ENABLE	1261	PROTOTYPES: ENABLE
784		1262
785	BOOT:	1263	BOOT:
786	{	1264	{
		1265	HV *stash = gv_stashpv ("IO::AIO", 1);
		1266
		1267	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		1268	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1269	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1270	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1271	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1272	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		1273
787	create_pipe ();	1274	create_pipe ();
788	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1275	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
789	}	1276	}
790		1277
791	void	1278	void
792	min_parallel (nthreads)	1279	max_poll_reqs (int nreqs)
793	int nthreads
794	PROTOTYPE: $	1280	PROTOTYPE: $
		1281	CODE:
		1282	max_poll_reqs = nreqs;
795		1283
796	void	1284	void
797	max_parallel (nthreads)	1285	max_poll_time (double nseconds)
798	int nthreads
799	PROTOTYPE: $	1286	PROTOTYPE: $
		1287	CODE:
		1288	max_poll_time = nseconds * AIO_TICKS;
		1289
		1290	void
		1291	min_parallel (int nthreads)
		1292	PROTOTYPE: $
		1293
		1294	void
		1295	max_parallel (int nthreads)
		1296	PROTOTYPE: $
		1297
		1298	void
		1299	max_idle (int nthreads)
		1300	PROTOTYPE: $
		1301	CODE:
		1302	set_max_idle (nthreads);
800		1303
801	int	1304	int
802	max_outstanding (nreqs)	1305	max_outstanding (int maxreqs)
803	int nreqs	1306	PROTOTYPE: $
804	PROTOTYPE: $
805	CODE:	1307	CODE:
806	RETVAL = max_outstanding;	1308	RETVAL = max_outstanding;
807	max_outstanding = nreqs;	1309	max_outstanding = maxreqs;
		1310	OUTPUT:
		1311	RETVAL
808		1312
809	void	1313	void
810	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	1314	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
811	SV * pathname	1315	SV8 * pathname
812	int flags	1316	int flags
813	int mode	1317	int mode
814	SV * callback	1318	SV * callback
815	PROTOTYPE: $$$;$	1319	PROTOTYPE: $$$;$
816	CODE:	1320	PPCODE:
817	{	1321	{
818	dREQ;	1322	dREQ;
819		1323
820	req->type = REQ_OPEN;	1324	req->type = REQ_OPEN;
821	req->data = newSVsv (pathname);	1325	req->sv1 = newSVsv (pathname);
822	req->dataptr = SvPVbyte_nolen (req->data);	1326	req->ptr1 = SvPVbyte_nolen (req->sv1);
823	req->fd = flags;	1327	req->int1 = flags;
824	req->mode = mode;	1328	req->mode = mode;
825		1329
826	send_req (req);	1330	REQ_SEND;
827	}	1331	}
828		1332
829	void	1333	void
830	aio_close (fh,callback=&PL_sv_undef)	1334	aio_close (fh,callback=&PL_sv_undef)
831	SV * fh	1335	SV * fh
…		…
833	PROTOTYPE: $;$	1337	PROTOTYPE: $;$
834	ALIAS:	1338	ALIAS:
835	aio_close = REQ_CLOSE	1339	aio_close = REQ_CLOSE
836	aio_fsync = REQ_FSYNC	1340	aio_fsync = REQ_FSYNC
837	aio_fdatasync = REQ_FDATASYNC	1341	aio_fdatasync = REQ_FDATASYNC
838	CODE:	1342	PPCODE:
839	{	1343	{
840	dREQ;	1344	dREQ;
841		1345
842	req->type = ix;	1346	req->type = ix;
843	req->fh = newSVsv (fh);	1347	req->fh = newSVsv (fh);
844	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1348	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
845		1349
846	send_req (req);	1350	REQ_SEND (req);
847	}	1351	}
848		1352
849	void	1353	void
850	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1354	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
851	SV * fh	1355	SV * fh
852	UV offset	1356	UV offset
853	UV length	1357	UV length
854	SV * data	1358	SV8 * data
855	UV dataoffset	1359	UV dataoffset
856	SV * callback	1360	SV * callback
857	ALIAS:	1361	ALIAS:
858	aio_read = REQ_READ	1362	aio_read = REQ_READ
859	aio_write = REQ_WRITE	1363	aio_write = REQ_WRITE
860	PROTOTYPE: $$$$$;$	1364	PROTOTYPE: $$$$$;$
861	CODE:	1365	PPCODE:
862	{	1366	{
863	aio_req req;
864	STRLEN svlen;	1367	STRLEN svlen;
865	char *svptr = SvPVbyte (data, svlen);	1368	char *svptr = SvPVbyte (data, svlen);
866		1369
867	SvUPGRADE (data, SVt_PV);	1370	SvUPGRADE (data, SVt_PV);
868	SvPOK_on (data);	1371	SvPOK_on (data);
…		…
890		1393
891	{	1394	{
892	dREQ;	1395	dREQ;
893		1396
894	req->type = ix;	1397	req->type = ix;
895	req->fh = newSVsv (fh);	1398	req->fh = newSVsv (fh);
896	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1399	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
897	: IoOFP (sv_2io (fh)));	1400	: IoOFP (sv_2io (fh)));
898	req->offset = offset;	1401	req->offs = offset;
899	req->length = length;	1402	req->size = length;
900	req->data = SvREFCNT_inc (data);	1403	req->sv1 = SvREFCNT_inc (data);
901	req->dataptr = (char *)svptr + dataoffset;	1404	req->ptr1 = (char *)svptr + dataoffset;
		1405	req->stroffset = dataoffset;
902		1406
903	if (!SvREADONLY (data))	1407	if (!SvREADONLY (data))
904	{	1408	{
905	SvREADONLY_on (data);	1409	SvREADONLY_on (data);
906	req->data2ptr = (void *)data;	1410	req->flags |= FLAG_SV1_RO_OFF;
907	}	1411	}
908		1412
909	send_req (req);	1413	REQ_SEND;
910	}	1414	}
		1415	}
		1416
		1417	void
		1418	aio_readlink (path,callback=&PL_sv_undef)
		1419	SV8 * path
		1420	SV * callback
		1421	PROTOTYPE: $$;$
		1422	PPCODE:
		1423	{
		1424	SV *data;
		1425	dREQ;
		1426
		1427	data = newSV (NAME_MAX);
		1428	SvPOK_on (data);
		1429
		1430	req->type = REQ_READLINK;
		1431	req->fh = newSVsv (path);
		1432	req->ptr2 = SvPVbyte_nolen (req->fh);
		1433	req->sv1 = data;
		1434	req->ptr1 = SvPVbyte_nolen (data);
		1435
		1436	REQ_SEND;
911	}	1437	}
912		1438
913	void	1439	void
914	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	1440	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
915	SV * out_fh	1441	SV * out_fh
916	SV * in_fh	1442	SV * in_fh
917	UV in_offset	1443	UV in_offset
918	UV length	1444	UV length
919	SV * callback	1445	SV * callback
920	PROTOTYPE: $$$$;$	1446	PROTOTYPE: $$$$;$
921	CODE:	1447	PPCODE:
922	{	1448	{
923	dREQ;	1449	dREQ;
924		1450
925	req->type = REQ_SENDFILE;	1451	req->type = REQ_SENDFILE;
926	req->fh = newSVsv (out_fh);	1452	req->fh = newSVsv (out_fh);
927	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1453	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
928	req->fh2 = newSVsv (in_fh);	1454	req->sv2 = newSVsv (in_fh);
929	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1455	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
930	req->offset = in_offset;	1456	req->offs = in_offset;
931	req->length = length;	1457	req->size = length;
932		1458
933	send_req (req);	1459	REQ_SEND;
934	}	1460	}
935		1461
936	void	1462	void
937	aio_readahead (fh,offset,length,callback=&PL_sv_undef)	1463	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
938	SV * fh	1464	SV * fh
939	UV offset	1465	UV offset
940	IV length	1466	IV length
941	SV * callback	1467	SV * callback
942	PROTOTYPE: $$$;$	1468	PROTOTYPE: $$$;$
943	CODE:	1469	PPCODE:
944	{	1470	{
945	dREQ;	1471	dREQ;
946		1472
947	req->type = REQ_READAHEAD;	1473	req->type = REQ_READAHEAD;
948	req->fh = newSVsv (fh);	1474	req->fh = newSVsv (fh);
949	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1475	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
950	req->offset = offset;	1476	req->offs = offset;
951	req->length = length;	1477	req->size = length;
952		1478
953	send_req (req);	1479	REQ_SEND;
954	}	1480	}
955		1481
956	void	1482	void
957	aio_stat (fh_or_path,callback=&PL_sv_undef)	1483	aio_stat (fh_or_path,callback=&PL_sv_undef)
958	SV * fh_or_path	1484	SV8 * fh_or_path
959	SV * callback	1485	SV * callback
960	ALIAS:	1486	ALIAS:
961	aio_stat = REQ_STAT	1487	aio_stat = REQ_STAT
962	aio_lstat = REQ_LSTAT	1488	aio_lstat = REQ_LSTAT
963	CODE:	1489	PPCODE:
964	{	1490	{
965	dREQ;	1491	dREQ;
966		1492
967	New (0, req->statdata, 1, Stat_t);	1493	req->ptr2 = malloc (sizeof (Stat_t));
968	if (!req->statdata)	1494	if (!req->ptr2)
969	{	1495	{
970	free_req (req);	1496	req_free (req);
971	croak ("out of memory during aio_req->statdata allocation");	1497	croak ("out of memory during aio_stat statdata allocation");
972	}	1498	}
		1499
		1500	req->flags |= FLAG_PTR2_FREE;
973		1501
974	if (SvPOK (fh_or_path))	1502	if (SvPOK (fh_or_path))
975	{	1503	{
976	req->type = ix;	1504	req->type = ix;
977	req->data = newSVsv (fh_or_path);	1505	req->sv1 = newSVsv (fh_or_path);
978	req->dataptr = SvPVbyte_nolen (req->data);	1506	req->ptr1 = SvPVbyte_nolen (req->sv1);
979	}	1507	}
980	else	1508	else
981	{	1509	{
982	req->type = REQ_FSTAT;	1510	req->type = REQ_FSTAT;
983	req->fh = newSVsv (fh_or_path);	1511	req->fh = newSVsv (fh_or_path);
984	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1512	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
985	}	1513	}
986		1514
987	send_req (req);	1515	REQ_SEND;
988	}	1516	}
989		1517
990	void	1518	void
991	aio_unlink (pathname,callback=&PL_sv_undef)	1519	aio_unlink (pathname,callback=&PL_sv_undef)
992	SV * pathname	1520	SV8 * pathname
993	SV * callback	1521	SV * callback
994	ALIAS:	1522	ALIAS:
995	aio_unlink = REQ_UNLINK	1523	aio_unlink = REQ_UNLINK
996	aio_rmdir = REQ_RMDIR	1524	aio_rmdir = REQ_RMDIR
997	aio_readdir = REQ_READDIR	1525	aio_readdir = REQ_READDIR
998	CODE:	1526	PPCODE:
999	{	1527	{
1000	dREQ;	1528	dREQ;
1001		1529
1002	req->type = ix;	1530	req->type = ix;
1003	req->data = newSVsv (pathname);	1531	req->sv1 = newSVsv (pathname);
1004	req->dataptr = SvPVbyte_nolen (req->data);	1532	req->ptr1 = SvPVbyte_nolen (req->sv1);
1005		1533
1006	send_req (req);	1534	REQ_SEND;
1007	}	1535	}
1008		1536
1009	void	1537	void
1010	aio_link (oldpath,newpath,callback=&PL_sv_undef)	1538	aio_link (oldpath,newpath,callback=&PL_sv_undef)
1011	SV * oldpath	1539	SV8 * oldpath
1012	SV * newpath	1540	SV8 * newpath
1013	SV * callback	1541	SV * callback
1014	ALIAS:	1542	ALIAS:
1015	aio_link = REQ_LINK	1543	aio_link = REQ_LINK
1016	aio_symlink = REQ_SYMLINK	1544	aio_symlink = REQ_SYMLINK
1017	aio_rename = REQ_RENAME	1545	aio_rename = REQ_RENAME
1018	CODE:	1546	PPCODE:
1019	{	1547	{
1020	dREQ;	1548	dREQ;
1021		1549
1022	req->type = ix;	1550	req->type = ix;
1023	req->fh = newSVsv (oldpath);	1551	req->fh = newSVsv (oldpath);
1024	req->data2ptr = SvPVbyte_nolen (req->fh);	1552	req->ptr2 = SvPVbyte_nolen (req->fh);
1025	req->data = newSVsv (newpath);	1553	req->sv1 = newSVsv (newpath);
1026	req->dataptr = SvPVbyte_nolen (req->data);	1554	req->ptr1 = SvPVbyte_nolen (req->sv1);
1027		1555
1028	send_req (req);	1556	REQ_SEND;
1029	}	1557	}
		1558
		1559	void
		1560	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
		1561	SV8 * pathname
		1562	SV * callback
		1563	UV mode
		1564	UV dev
		1565	PPCODE:
		1566	{
		1567	dREQ;
		1568
		1569	req->type = REQ_MKNOD;
		1570	req->sv1 = newSVsv (pathname);
		1571	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1572	req->mode = (mode_t)mode;
		1573	req->offs = dev;
		1574
		1575	REQ_SEND;
		1576	}
		1577
		1578	void
		1579	aio_busy (delay,callback=&PL_sv_undef)
		1580	double delay
		1581	SV * callback
		1582	PPCODE:
		1583	{
		1584	dREQ;
		1585
		1586	req->type = REQ_BUSY;
		1587	req->int1 = delay < 0. ? 0 : delay;
		1588	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
		1589
		1590	REQ_SEND;
		1591	}
		1592
		1593	void
		1594	aio_group (callback=&PL_sv_undef)
		1595	SV * callback
		1596	PROTOTYPE: ;$
		1597	PPCODE:
		1598	{
		1599	dREQ;
		1600
		1601	req->type = REQ_GROUP;
		1602
		1603	req_send (req);
		1604	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1605	}
		1606
		1607	void
		1608	aio_nop (callback=&PL_sv_undef)
		1609	SV * callback
		1610	PPCODE:
		1611	{
		1612	dREQ;
		1613
		1614	req->type = REQ_NOP;
		1615
		1616	REQ_SEND;
		1617	}
		1618
		1619	int
		1620	aioreq_pri (int pri = 0)
		1621	PROTOTYPE: ;$
		1622	CODE:
		1623	RETVAL = next_pri - PRI_BIAS;
		1624	if (items > 0)
		1625	{
		1626	if (pri < PRI_MIN) pri = PRI_MIN;
		1627	if (pri > PRI_MAX) pri = PRI_MAX;
		1628	next_pri = pri + PRI_BIAS;
		1629	}
		1630	OUTPUT:
		1631	RETVAL
		1632
		1633	void
		1634	aioreq_nice (int nice = 0)
		1635	CODE:
		1636	nice = next_pri - nice;
		1637	if (nice < PRI_MIN) nice = PRI_MIN;
		1638	if (nice > PRI_MAX) nice = PRI_MAX;
		1639	next_pri = nice + PRI_BIAS;
1030		1640
1031	void	1641	void
1032	flush ()	1642	flush ()
1033	PROTOTYPE:	1643	PROTOTYPE:
1034	CODE:	1644	CODE:
…		…
1036	{	1646	{
1037	poll_wait ();	1647	poll_wait ();
1038	poll_cb ();	1648	poll_cb ();
1039	}	1649	}
1040		1650
1041	void	1651	int
1042	poll()	1652	poll()
1043	PROTOTYPE:	1653	PROTOTYPE:
1044	CODE:	1654	CODE:
1045	if (nreqs)
1046	{
1047	poll_wait ();	1655	poll_wait ();
1048	poll_cb ();	1656	RETVAL = poll_cb ();
1049	}	1657	OUTPUT:
		1658	RETVAL
1050		1659
1051	int	1660	int
1052	poll_fileno()	1661	poll_fileno()
1053	PROTOTYPE:	1662	PROTOTYPE:
1054	CODE:	1663	CODE:
…		…
1066		1675
1067	void	1676	void
1068	poll_wait()	1677	poll_wait()
1069	PROTOTYPE:	1678	PROTOTYPE:
1070	CODE:	1679	CODE:
1071	if (nreqs)
1072	poll_wait ();	1680	poll_wait ();
1073		1681
1074	int	1682	int
1075	nreqs()	1683	nreqs()
1076	PROTOTYPE:	1684	PROTOTYPE:
1077	CODE:	1685	CODE:
1078	RETVAL = nreqs;	1686	RETVAL = nreqs;
1079	OUTPUT:	1687	OUTPUT:
1080	RETVAL	1688	RETVAL
1081		1689
		1690	int
		1691	nready()
		1692	PROTOTYPE:
		1693	CODE:
		1694	RETVAL = get_nready ();
		1695	OUTPUT:
		1696	RETVAL
		1697
		1698	int
		1699	npending()
		1700	PROTOTYPE:
		1701	CODE:
		1702	RETVAL = get_npending ();
		1703	OUTPUT:
		1704	RETVAL
		1705
		1706	int
		1707	nthreads()
		1708	PROTOTYPE:
		1709	CODE:
		1710	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1711	RETVAL = started;
		1712	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1713	OUTPUT:
		1714	RETVAL
		1715
		1716	PROTOTYPES: DISABLE
		1717
		1718	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1719
		1720	void
		1721	cancel (aio_req_ornot req)
		1722	CODE:
		1723	req_cancel (req);
		1724
		1725	void
		1726	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1727	CODE:
		1728	SvREFCNT_dec (req->callback);
		1729	req->callback = newSVsv (callback);
		1730
		1731	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1732
		1733	void
		1734	add (aio_req grp, ...)
		1735	PPCODE:
		1736	{
		1737	int i;
		1738	aio_req req;
		1739
		1740	if (grp->int1 == 2)
		1741	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1742
		1743	for (i = 1; i < items; ++i )
		1744	{
		1745	if (GIMME_V != G_VOID)
		1746	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1747
		1748	req = SvAIO_REQ (ST (i));
		1749
		1750	if (req)
		1751	{
		1752	++grp->size;
		1753	req->grp = grp;
		1754
		1755	req->grp_prev = 0;
		1756	req->grp_next = grp->grp_first;
		1757
		1758	if (grp->grp_first)
		1759	grp->grp_first->grp_prev = req;
		1760
		1761	grp->grp_first = req;
		1762	}
		1763	}
		1764	}
		1765
		1766	void
		1767	cancel_subs (aio_req_ornot req)
		1768	CODE:
		1769	req_cancel_subs (req);
		1770
		1771	void
		1772	result (aio_req grp, ...)
		1773	CODE:
		1774	{
		1775	int i;
		1776	AV *av;
		1777
		1778	grp->errorno = errno;
		1779
		1780	av = newAV ();
		1781
		1782	for (i = 1; i < items; ++i )
		1783	av_push (av, newSVsv (ST (i)));
		1784
		1785	SvREFCNT_dec (grp->sv1);
		1786	grp->sv1 = (SV *)av;
		1787	}
		1788
		1789	void
		1790	errno (aio_req grp, int errorno = errno)
		1791	CODE:
		1792	grp->errorno = errorno;
		1793
		1794	void
		1795	limit (aio_req grp, int limit)
		1796	CODE:
		1797	grp->int2 = limit;
		1798	aio_grp_feed (grp);
		1799
		1800	void
		1801	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1802	CODE:
		1803	{
		1804	SvREFCNT_dec (grp->sv2);
		1805	grp->sv2 = newSVsv (callback);
		1806
		1807	if (grp->int2 <= 0)
		1808	grp->int2 = 2;
		1809
		1810	aio_grp_feed (grp);
		1811	}
		1812

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