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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.44 by root, Sat Oct 21 23:20:29 2006 UTC vs.
Revision 1.88 by root, Mon Oct 30 23:43:17 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,
58	REQ_GROUP,	102	REQ_GROUP, REQ_NOP,
		103	REQ_BUSY,
59	};	104	};
60		105
61	#define AIO_REQ_KLASS "IO::AIO::REQ"	106	#define AIO_REQ_KLASS "IO::AIO::REQ"
62	#define AIO_GRP_KLASS "IO::AIO::GRP"	107	#define AIO_GRP_KLASS "IO::AIO::GRP"
63		108
64	typedef struct aio_cb	109	typedef struct aio_cb
65	{	110	{
66	struct aio_cb *grp, *grp_prev, *grp_next;
67
68	struct aio_cb *volatile next;	111	struct aio_cb *volatile next;
69		112
		113	SV *callback, *fh;
		114	SV *sv1, *sv2;
		115	void *ptr1, *ptr2;
		116	off_t offs;
		117	size_t size;
		118	ssize_t result;
		119
		120	STRLEN stroffset;
		121	int type;
		122	int int1, int2;
		123	int errorno;
		124	mode_t mode; /* open */
		125
		126	unsigned char flags;
		127	unsigned char pri;
		128
70	SV *self; /* the perl counterpart of this request, if any */	129	SV *self; /* the perl counterpart of this request, if any */
71		130	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
72	SV *data, *callback;
73	SV *fh, *fh2;
74	void *dataptr, *data2ptr;
75	Stat_t *statdata;
76	off_t offset;
77	size_t length;
78	ssize_t result;
79
80	int type;
81	int fd, fd2;
82	int errorno;
83	STRLEN dataoffset;
84	mode_t mode; /* open */
85	unsigned char cancelled;
86	} aio_cb;	131	} aio_cb;
		132
		133	enum {
		134	FLAG_CANCELLED = 0x01,
		135	FLAG_SV1_RO_OFF = 0x40, /* data was set readonly */
		136	FLAG_PTR2_FREE = 0x80, /* need free(ptr2) */
		137	};
87		138
88	typedef aio_cb *aio_req;	139	typedef aio_cb *aio_req;
89	typedef aio_cb *aio_req_ornot;	140	typedef aio_cb *aio_req_ornot;
90	typedef aio_cb *aio_group;
91		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
92	static int started, wanted;	165	static unsigned int started, idle, wanted;
93	static volatile int nreqs;	166
94	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;
95	static int respipe [2];	219	static int respipe [2];
96		220
97	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	221	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
98	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	222	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
99	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	223	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
100		224
101	static volatile aio_req reqs, reqe; /* queue start, queue end */	225	#if WORDACCESS_UNSAFE
102	static volatile aio_req ress, rese; /* queue start, queue end */	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);
		324	static void req_free (aio_req req);
		325	static void req_cancel (aio_req req);
103		326
104	/* must be called at most once */	327	/* must be called at most once */
105	static SV *req_sv (aio_req req, const char *klass)	328	static SV *req_sv (aio_req req, const char *klass)
106	{	329	{
		330	if (!req->self)
		331	{
107	req->self = (SV *)newHV ();	332	req->self = (SV *)newHV ();
108	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);	333	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		334	}
109		335
110	return sv_2mortal (sv_bless (newRV_noinc (req->self), gv_stashpv (klass, 1)));	336	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
111	}	337	}
112		338
113	static aio_req SvAIO_REQ (SV *sv, const char *klass)	339	static aio_req SvAIO_REQ (SV *sv)
114	{	340	{
		341	MAGIC *mg;
		342
115	if (!sv_derived_from (sv, klass) || !SvROK (sv))	343	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
116	croak ("object of class %s expected", klass);	344	croak ("object of class " AIO_REQ_KLASS " expected");
117		345
118	MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext);	346	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
119		347
120	return mg ? (aio_req)mg->mg_ptr : 0;	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	{
		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_SV1_RO_OFF)
		402	SvREADONLY_off (req->sv1);
		403
		404	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		405	{
		406	ENTER;
		407	SAVETMPS;
		408	PUSHMARK (SP);
		409	EXTEND (SP, 1);
		410
		411	switch (req->type)
		412	{
		413	case REQ_READDIR:
		414	{
		415	SV *rv = &PL_sv_undef;
		416
		417	if (req->result >= 0)
		418	{
		419	int i;
		420	char *buf = req->ptr2;
		421	AV *av = newAV ();
		422
		423	av_extend (av, req->result - 1);
		424
		425	for (i = 0; i < req->result; ++i)
		426	{
		427	SV *sv = newSVpv (buf, 0);
		428
		429	av_store (av, i, sv);
		430	buf += SvCUR (sv) + 1;
		431	}
		432
		433	rv = sv_2mortal (newRV_noinc ((SV *)av));
		434	}
		435
		436	PUSHs (rv);
		437	}
		438	break;
		439
		440	case REQ_OPEN:
		441	{
		442	/* convert fd to fh */
		443	SV *fh;
		444
		445	PUSHs (sv_2mortal (newSViv (req->result)));
		446	PUTBACK;
		447	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		448	SPAGAIN;
		449
		450	fh = SvREFCNT_inc (POPs);
		451
		452	PUSHMARK (SP);
		453	XPUSHs (sv_2mortal (fh));
		454	}
		455	break;
		456
		457	case REQ_GROUP:
		458	req->int1 = 2; /* mark group as finished */
		459
		460	if (req->sv1)
		461	{
		462	int i;
		463	AV *av = (AV *)req->sv1;
		464
		465	EXTEND (SP, AvFILL (av) + 1);
		466	for (i = 0; i <= AvFILL (av); ++i)
		467	PUSHs (*av_fetch (av, i, 0));
		468	}
		469	break;
		470
		471	case REQ_NOP:
		472	case REQ_BUSY:
		473	break;
		474
		475	case REQ_READLINK:
		476	if (req->result > 0)
		477	{
		478	SvCUR_set (req->sv1, req->result);
		479	*SvEND (req->sv1) = 0;
		480	PUSHs (req->sv1);
		481	}
		482	break;
		483
		484	case REQ_STAT:
		485	case REQ_LSTAT:
		486	case REQ_FSTAT:
		487	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		488	PL_laststatval = req->result;
		489	PL_statcache = *(Stat_t *)(req->ptr2);
		490	PUSHs (sv_2mortal (newSViv (req->result)));
		491	break;
		492
		493	case REQ_READ:
		494	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		495	*SvEND (req->sv1) = 0;
		496	PUSHs (sv_2mortal (newSViv (req->result)));
		497	break;
		498
		499	default:
		500	PUSHs (sv_2mortal (newSViv (req->result)));
		501	break;
		502	}
		503
		504	errno = req->errorno;
		505
		506	PUTBACK;
		507	call_sv (req->callback, G_VOID | G_EVAL);
		508	SPAGAIN;
		509
		510	FREETMPS;
		511	LEAVE;
		512	}
		513
		514	if (req->grp)
		515	{
		516	aio_req grp = req->grp;
		517
		518	/* unlink request */
		519	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		520	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		521
		522	if (grp->grp_first == req)
		523	grp->grp_first = req->grp_next;
		524
		525	aio_grp_dec (grp);
		526	}
		527
		528	if (SvTRUE (ERRSV))
		529	{
		530	req_free (req);
		531	croak (0);
		532	}
121	}	533	}
122		534
123	static void req_free (aio_req req)	535	static void req_free (aio_req req)
124	{	536	{
125	if (req->self)	537	if (req->self)
126	{	538	{
127	sv_unmagic (req->self, PERL_MAGIC_ext);	539	sv_unmagic (req->self, PERL_MAGIC_ext);
128	SvREFCNT_dec (req->self);	540	SvREFCNT_dec (req->self);
129	}	541	}
130		542
131	if (req->data)
132	SvREFCNT_dec (req->data);
133
134	if (req->fh)
135	SvREFCNT_dec (req->fh);	543	SvREFCNT_dec (req->fh);
136		544	SvREFCNT_dec (req->sv1);
137	if (req->fh2)
138	SvREFCNT_dec (req->fh2);	545	SvREFCNT_dec (req->sv2);
139
140	if (req->statdata)
141	Safefree (req->statdata);
142
143	if (req->callback)
144	SvREFCNT_dec (req->callback);	546	SvREFCNT_dec (req->callback);
145		547
146	if (req->type == REQ_READDIR && req->result >= 0)	548	if (req->flags & FLAG_PTR2_FREE)
147	free (req->data2ptr);	549	free (req->ptr2);
148		550
149	Safefree (req);	551	Safefree (req);
150	}	552	}
151		553
152	static void	554	static void req_cancel_subs (aio_req grp)
153	poll_wait ()
154	{	555	{
155	if (nreqs && !ress)	556	aio_req sub;
		557
		558	if (grp->type != REQ_GROUP)
		559	return;
		560
		561	SvREFCNT_dec (grp->sv2);
		562	grp->sv2 = 0;
		563
		564	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		565	req_cancel (sub);
		566	}
		567
		568	static void req_cancel (aio_req req)
		569	{
		570	req->flags |= FLAG_CANCELLED;
		571
		572	req_cancel_subs (req);
		573	}
		574
		575	static void *aio_proc(void *arg);
		576
		577	static void start_thread (void)
		578	{
		579	sigset_t fullsigset, oldsigset;
		580	pthread_attr_t attr;
		581
		582	worker *wrk = calloc (1, sizeof (worker));
		583
		584	if (!wrk)
		585	croak ("unable to allocate worker thread data");
		586
		587	pthread_attr_init (&attr);
		588	pthread_attr_setstacksize (&attr, STACKSIZE);
		589	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		590	#ifdef PTHREAD_SCOPE_PROCESS
		591	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		592	#endif
		593
		594	sigfillset (&fullsigset);
		595
		596	LOCK (wrklock);
		597	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
		598
		599	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
156	{	600	{
		601	wrk->prev = &wrk_first;
		602	wrk->next = wrk_first.next;
		603	wrk_first.next->prev = wrk;
		604	wrk_first.next = wrk;
		605	++started;
		606	}
		607	else
		608	free (wrk);
		609
		610	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		611	UNLOCK (wrklock);
		612	}
		613
		614	static void maybe_start_thread ()
		615	{
		616	if (get_nthreads () >= wanted)
		617	return;
		618
		619	/* todo: maybe use idle here, but might be less exact */
		620	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		621	return;
		622
		623	start_thread ();
		624	}
		625
		626	static void req_send (aio_req req)
		627	{
		628	++nreqs;
		629
		630	LOCK (reqlock);
		631	++nready;
		632	reqq_push (&req_queue, req);
		633	pthread_cond_signal (&reqwait);
		634	UNLOCK (reqlock);
		635
		636	maybe_start_thread ();
		637	}
		638
		639	static void end_thread (void)
		640	{
		641	aio_req req;
		642
		643	Newz (0, req, 1, aio_cb);
		644
		645	req->type = REQ_QUIT;
		646	req->pri = PRI_MAX + PRI_BIAS;
		647
		648	LOCK (reqlock);
		649	reqq_push (&req_queue, req);
		650	pthread_cond_signal (&reqwait);
		651	UNLOCK (reqlock);
		652
		653	LOCK (wrklock);
		654	--started;
		655	UNLOCK (wrklock);
		656	}
		657
		658	static void set_max_idle (int nthreads)
		659	{
		660	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		661	max_idle = nthreads <= 0 ? 1 : nthreads;
		662	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
		663	}
		664
		665	static void min_parallel (int nthreads)
		666	{
		667	if (wanted < nthreads)
		668	wanted = nthreads;
		669	}
		670
		671	static void max_parallel (int nthreads)
		672	{
		673	if (wanted > nthreads)
		674	wanted = nthreads;
		675
		676	while (started > wanted)
		677	end_thread ();
		678	}
		679
		680	static void poll_wait ()
		681	{
157	fd_set rfd;	682	fd_set rfd;
		683
		684	while (nreqs)
		685	{
		686	int size;
		687	if (WORDACCESS_UNSAFE) LOCK (reslock);
		688	size = res_queue.size;
		689	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		690
		691	if (size)
		692	return;
		693
		694	maybe_start_thread ();
		695
158	FD_ZERO(&rfd);	696	FD_ZERO(&rfd);
159	FD_SET(respipe [0], &rfd);	697	FD_SET(respipe [0], &rfd);
160		698
161	select (respipe [0] + 1, &rfd, 0, 0, 0);	699	select (respipe [0] + 1, &rfd, 0, 0, 0);
162	}	700	}
163	}	701	}
164		702
165	static int	703	static int poll_cb ()
166	poll_cb ()
167	{	704	{
168	dSP;	705	dSP;
169	int count = 0;	706	int count = 0;
		707	int maxreqs = max_poll_reqs;
170	int do_croak = 0;	708	int do_croak = 0;
		709	struct timeval tv_start, tv_now;
171	aio_req req;	710	aio_req req;
		711
		712	if (max_poll_time)
		713	gettimeofday (&tv_start, 0);
172		714
173	for (;;)	715	for (;;)
174	{	716	{
175	pthread_mutex_lock (&reslock);	717	for (;;)
176	req = ress;
177
178	if (req)
179	{	718	{
180	ress = req->next;	719	maybe_start_thread ();
181		720
		721	LOCK (reslock);
		722	req = reqq_shift (&res_queue);
		723
182	if (!ress)	724	if (req)
183	{	725	{
		726	--npending;
		727
		728	if (!res_queue.size)
		729	{
184	/* read any signals sent by the worker threads */	730	/* read any signals sent by the worker threads */
185	char buf [32];	731	char buf [32];
186	while (read (respipe [0], buf, 32) == 32)	732	while (read (respipe [0], buf, 32) == 32)
		733	;
187	;	734	}
188
189	rese = 0;
190	}	735	}
191	}
192		736
193	pthread_mutex_unlock (&reslock);	737	UNLOCK (reslock);
194		738
195	if (!req)	739	if (!req)
196	break;	740	break;
197		741
198	nreqs--;	742	--nreqs;
199		743
200	if (req->type == REQ_QUIT)
201	started--;
202	else
203	{
204	int errorno = errno;
205	errno = req->errorno;
206
207	if (req->type == REQ_READ)	744	if (req->type == REQ_GROUP && req->size)
208	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
209
210	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
211	SvREADONLY_off (req->data);
212
213	if (req->statdata)
214	{	745	{
215	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	746	req->int1 = 1; /* mark request as delayed */
216	PL_laststatval = req->result;	747	continue;
217	PL_statcache = *(req->statdata);
218	}
219
220	ENTER;
221	PUSHMARK (SP);
222
223	if (req->type == REQ_READDIR)
224	{
225	SV *rv = &PL_sv_undef;
226
227	if (req->result >= 0)
228	{
229	char *buf = req->data2ptr;
230	AV *av = newAV ();
231
232	while (req->result)
233	{
234	SV *sv = newSVpv (buf, 0);
235
236	av_push (av, sv);
237	buf += SvCUR (sv) + 1;
238	req->result--;
239	}
240
241	rv = sv_2mortal (newRV_noinc ((SV *)av));
242	}
243
244	XPUSHs (rv);
245	}	748	}
246	else	749	else
247	{	750	{
248	XPUSHs (sv_2mortal (newSViv (req->result)));	751	req_invoke (req);
249		752
250	if (req->type == REQ_OPEN)	753	count++;
251	{
252	/* convert fd to fh */
253	SV *fh;
254
255	PUTBACK;
256	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
257	SPAGAIN;
258
259	fh = SvREFCNT_inc (POPs);
260
261	PUSHMARK (SP);
262	XPUSHs (sv_2mortal (fh));
263	}
264	}	754	}
265		755
266	if (SvOK (req->callback) && !req->cancelled)	756	req_free (req);
		757
		758	if (maxreqs && !--maxreqs)
		759	break;
		760
		761	if (max_poll_time)
267	{	762	{
268	PUTBACK;	763	gettimeofday (&tv_now, 0);
269	call_sv (req->callback, G_VOID | G_EVAL);
270	SPAGAIN;
271		764
272	if (SvTRUE (ERRSV))	765	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
273	{	766	break;
274	req_free (req);
275	croak (0);
276	}
277	}	767	}
278
279	LEAVE;
280
281	errno = errorno;
282	count++;
283	}	768	}
284		769
285	req_free (req);	770	if (nreqs <= max_outstanding)
		771	break;
		772
		773	poll_wait ();
		774
		775	++maxreqs;
286	}	776	}
287		777
288	return count;	778	return count;
289	}
290
291	static void *aio_proc(void *arg);
292
293	static void
294	start_thread (void)
295	{
296	sigset_t fullsigset, oldsigset;
297	pthread_t tid;
298	pthread_attr_t attr;
299
300	pthread_attr_init (&attr);
301	pthread_attr_setstacksize (&attr, STACKSIZE);
302	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
303
304	sigfillset (&fullsigset);
305	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
306
307	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
308	started++;
309
310	sigprocmask (SIG_SETMASK, &oldsigset, 0);
311	}
312
313	static void
314	req_send (aio_req req)
315	{
316	while (started < wanted && nreqs >= started)
317	start_thread ();
318
319	nreqs++;
320
321	pthread_mutex_lock (&reqlock);
322
323	req->next = 0;
324
325	if (reqe)
326	{
327	reqe->next = req;
328	reqe = req;
329	}
330	else
331	reqe = reqs = req;
332
333	pthread_cond_signal (&reqwait);
334	pthread_mutex_unlock (&reqlock);
335
336	if (nreqs > max_outstanding)
337	for (;;)
338	{
339	poll_cb ();
340
341	if (nreqs <= max_outstanding)
342	break;
343
344	poll_wait ();
345	}
346	}
347
348	static void
349	end_thread (void)
350	{
351	aio_req req;
352	Newz (0, req, 1, aio_cb);
353	req->type = REQ_QUIT;
354
355	req_send (req);
356	}
357
358	static void min_parallel (int nthreads)
359	{
360	if (wanted < nthreads)
361	wanted = nthreads;
362	}
363
364	static void max_parallel (int nthreads)
365	{
366	int cur = started;
367
368	if (wanted > nthreads)
369	wanted = nthreads;
370
371	while (cur > wanted)
372	{
373	end_thread ();
374	cur--;
375	}
376
377	while (started > wanted)
378	{
379	poll_wait ();
380	poll_cb ();
381	}
382	}	779	}
383		780
384	static void create_pipe ()	781	static void create_pipe ()
385	{	782	{
386	if (pipe (respipe))	783	if (pipe (respipe))
…		…
405	* normal read/write by using a mutex. slows down execution a lot,	802	* normal read/write by using a mutex. slows down execution a lot,
406	* but that's your problem, not mine.	803	* but that's your problem, not mine.
407	*/	804	*/
408	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;	805	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
409		806
410	static ssize_t	807	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
411	pread (int fd, void *buf, size_t count, off_t offset)
412	{	808	{
413	ssize_t res;	809	ssize_t res;
414	off_t ooffset;	810	off_t ooffset;
415		811
416	pthread_mutex_lock (&preadwritelock);	812	LOCK (preadwritelock);
417	ooffset = lseek (fd, 0, SEEK_CUR);	813	ooffset = lseek (fd, 0, SEEK_CUR);
418	lseek (fd, offset, SEEK_SET);	814	lseek (fd, offset, SEEK_SET);
419	res = read (fd, buf, count);	815	res = read (fd, buf, count);
420	lseek (fd, ooffset, SEEK_SET);	816	lseek (fd, ooffset, SEEK_SET);
421	pthread_mutex_unlock (&preadwritelock);	817	UNLOCK (preadwritelock);
422		818
423	return res;	819	return res;
424	}	820	}
425		821
426	static ssize_t
427	pwrite (int fd, void *buf, size_t count, off_t offset)	822	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
428	{	823	{
429	ssize_t res;	824	ssize_t res;
430	off_t ooffset;	825	off_t ooffset;
431		826
432	pthread_mutex_lock (&preadwritelock);	827	LOCK (preadwritelock);
433	ooffset = lseek (fd, 0, SEEK_CUR);	828	ooffset = lseek (fd, 0, SEEK_CUR);
434	lseek (fd, offset, SEEK_SET);	829	lseek (fd, offset, SEEK_SET);
435	res = write (fd, buf, count);	830	res = write (fd, buf, count);
436	lseek (fd, offset, SEEK_SET);	831	lseek (fd, offset, SEEK_SET);
437	pthread_mutex_unlock (&preadwritelock);	832	UNLOCK (preadwritelock);
438		833
439	return res;	834	return res;
440	}	835	}
441	#endif	836	#endif
442		837
443	#if !HAVE_FDATASYNC	838	#if !HAVE_FDATASYNC
444	# define fdatasync fsync	839	# define fdatasync fsync
445	#endif	840	#endif
446		841
447	#if !HAVE_READAHEAD	842	#if !HAVE_READAHEAD
448	# define readahead aio_readahead	843	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
449		844
450	static ssize_t	845	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
451	readahead (int fd, off_t offset, size_t count)
452	{	846	{
453	char readahead_buf[4096];	847	dBUF;
454		848
455	while (count > 0)	849	while (count > 0)
456	{	850	{
457	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	851	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
458		852
459	pread (fd, readahead_buf, len, offset);	853	pread (fd, aio_buf, len, offset);
460	offset += len;	854	offset += len;
461	count -= len;	855	count -= len;
462	}	856	}
463		857
464	errno = 0;	858	errno = 0;
465	}	859	}
		860
466	#endif	861	#endif
467		862
468	#if !HAVE_READDIR_R	863	#if !HAVE_READDIR_R
469	# define readdir_r aio_readdir_r	864	# define readdir_r aio_readdir_r
470		865
471	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;	866	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
472		867
473	static int
474	readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)	868	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
475	{	869	{
476	struct dirent *e;	870	struct dirent *e;
477	int errorno;	871	int errorno;
478		872
479	pthread_mutex_lock (&readdirlock);	873	LOCK (readdirlock);
480		874
481	e = readdir (dirp);	875	e = readdir (dirp);
482	errorno = errno;	876	errorno = errno;
483		877
484	if (e)	878	if (e)
…		…
487	strcpy (ent->d_name, e->d_name);	881	strcpy (ent->d_name, e->d_name);
488	}	882	}
489	else	883	else
490	*res = 0;	884	*res = 0;
491		885
492	pthread_mutex_unlock (&readdirlock);	886	UNLOCK (readdirlock);
493		887
494	errno = errorno;	888	errno = errorno;
495	return e ? 0 : -1;	889	return e ? 0 : -1;
496	}	890	}
497	#endif	891	#endif
498		892
499	/* sendfile always needs emulation */	893	/* sendfile always needs emulation */
500	static ssize_t
501	sendfile_ (int ofd, int ifd, off_t offset, size_t count)	894	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
502	{	895	{
503	ssize_t res;	896	ssize_t res;
504		897
505	if (!count)	898	if (!count)
506	return 0;	899	return 0;
…		…
517	{	910	{
518	off_t sbytes;	911	off_t sbytes;
519	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	912	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
520		913
521	if (res < 0 && sbytes)	914	if (res < 0 && sbytes)
522	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	915	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
523	res = sbytes;	916	res = sbytes;
524	}	917	}
525		918
526	# elif __hpux	919	# elif __hpux
527	res = sendfile (ofd, ifd, offset, count, 0, 0);	920	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
555	#endif	948	#endif
556	)	949	)
557	)	950	)
558	{	951	{
559	/* emulate sendfile. this is a major pain in the ass */	952	/* emulate sendfile. this is a major pain in the ass */
560	char buf[4096];	953	dBUF;
		954
561	res = 0;	955	res = 0;
562		956
563	while (count)	957	while (count)
564	{	958	{
565	ssize_t cnt;	959	ssize_t cnt;
566		960
567	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	961	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
568		962
569	if (cnt <= 0)	963	if (cnt <= 0)
570	{	964	{
571	if (cnt && !res) res = -1;	965	if (cnt && !res) res = -1;
572	break;	966	break;
573	}	967	}
574		968
575	cnt = write (ofd, buf, cnt);	969	cnt = write (ofd, aio_buf, cnt);
576		970
577	if (cnt <= 0)	971	if (cnt <= 0)
578	{	972	{
579	if (cnt && !res) res = -1;	973	if (cnt && !res) res = -1;
580	break;	974	break;
…		…
588		982
589	return res;	983	return res;
590	}	984	}
591		985
592	/* read a full directory */	986	/* read a full directory */
593	static int	987	static void scandir_ (aio_req req, worker *self)
594	scandir_ (const char *path, void **namesp)
595	{	988	{
596	DIR *dirp = opendir (path);	989	DIR *dirp;
597	union	990	union
598	{	991	{
599	struct dirent d;	992	struct dirent d;
600	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	993	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
601	} u;	994	} *u;
602	struct dirent *entp;	995	struct dirent *entp;
603	char *name, *names;	996	char *name, *names;
604	int memlen = 4096;	997	int memlen = 4096;
605	int memofs = 0;	998	int memofs = 0;
606	int res = 0;	999	int res = 0;
607	int errorno;	1000	int errorno;
608		1001
609	if (!dirp)	1002	LOCK (wrklock);
610	return -1;	1003	self->dirp = dirp = opendir (req->ptr1);
611		1004	self->dbuf = u = malloc (sizeof (*u));
		1005	req->flags |= FLAG_PTR2_FREE;
612	names = malloc (memlen);	1006	req->ptr2 = names = malloc (memlen);
		1007	UNLOCK (wrklock);
		1008
		1009	if (dirp && u && names)
		1010	for (;;)
		1011	{
		1012	errno = 0;
		1013	readdir_r (dirp, &u->d, &entp);
		1014
		1015	if (!entp)
		1016	break;
		1017
		1018	name = entp->d_name;
		1019
		1020	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1021	{
		1022	int len = strlen (name) + 1;
		1023
		1024	res++;
		1025
		1026	while (memofs + len > memlen)
		1027	{
		1028	memlen *= 2;
		1029	LOCK (wrklock);
		1030	req->ptr2 = names = realloc (names, memlen);
		1031	UNLOCK (wrklock);
		1032
		1033	if (!names)
		1034	break;
		1035	}
		1036
		1037	memcpy (names + memofs, name, len);
		1038	memofs += len;
		1039	}
		1040	}
		1041
		1042	if (errno)
		1043	res = -1;
		1044
		1045	req->result = res;
		1046	}
		1047
		1048	/*****************************************************************************/
		1049
		1050	static void *aio_proc (void *thr_arg)
		1051	{
		1052	aio_req req;
		1053	struct timespec ts;
		1054	worker *self = (worker *)thr_arg;
		1055
		1056	/* try to distribute timeouts somewhat evenly */
		1057	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1058	* (1000000000UL / 1024UL);
613		1059
614	for (;;)	1060	for (;;)
615	{	1061	{
616	errno = 0, readdir_r (dirp, &u.d, &entp);	1062	ts.tv_sec = time (0) + IDLE_TIMEOUT;
617		1063
618	if (!entp)	1064	LOCK (reqlock);
619	break;
620
621	name = entp->d_name;
622
623	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
624	{
625	int len = strlen (name) + 1;
626
627	res++;
628
629	while (memofs + len > memlen)
630	{
631	memlen *= 2;
632	names = realloc (names, memlen);
633	if (!names)
634	break;
635	}
636
637	memcpy (names + memofs, name, len);
638	memofs += len;
639	}
640	}
641
642	errorno = errno;
643	closedir (dirp);
644
645	if (errorno)
646	{
647	free (names);
648	errno = errorno;
649	res = -1;
650	}
651
652	*namesp = (void *)names;
653	return res;
654	}
655
656	/*****************************************************************************/
657
658	static void *
659	aio_proc (void *thr_arg)
660	{
661	aio_req req;
662	int type;
663
664	do
665	{
666	pthread_mutex_lock (&reqlock);
667		1065
668	for (;;)	1066	for (;;)
669	{	1067	{
670	req = reqs;	1068	self->req = req = reqq_shift (&req_queue);
671
672	if (reqs)
673	{
674	reqs = reqs->next;
675	if (!reqs) reqe = 0;
676	}
677		1069
678	if (req)	1070	if (req)
679	break;	1071	break;
680		1072
		1073	++idle;
		1074
		1075	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1076	== ETIMEDOUT)
		1077	{
		1078	if (idle > max_idle)
		1079	{
		1080	--idle;
		1081	UNLOCK (reqlock);
		1082	LOCK (wrklock);
		1083	--started;
		1084	UNLOCK (wrklock);
		1085	goto quit;
		1086	}
		1087
		1088	/* we are allowed to idle, so do so without any timeout */
681	pthread_cond_wait (&reqwait, &reqlock);	1089	pthread_cond_wait (&reqwait, &reqlock);
		1090	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1091	}
		1092
		1093	--idle;
682	}	1094	}
683		1095
684	pthread_mutex_unlock (&reqlock);	1096	--nready;
		1097
		1098	UNLOCK (reqlock);
685		1099
686	errno = 0; /* strictly unnecessary */	1100	errno = 0; /* strictly unnecessary */
687		1101
688	if (!req->cancelled)	1102	if (!(req->flags & FLAG_CANCELLED))
689	switch (req->type)	1103	switch (req->type)
690	{	1104	{
691	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	1105	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
692	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	1106	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
693		1107
694	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	1108	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
695	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;	1109	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
696		1110
697	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1111	case REQ_STAT: req->result = stat (req->ptr1, (Stat_t *)req->ptr2); break;
698	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1112	case REQ_LSTAT: req->result = lstat (req->ptr1, (Stat_t *)req->ptr2); break;
699	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1113	case REQ_FSTAT: req->result = fstat (req->int1, (Stat_t *)req->ptr2); break;
700		1114
701	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	1115	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
702	case REQ_CLOSE: req->result = close (req->fd); break;	1116	case REQ_CLOSE: req->result = close (req->int1); break;
703	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1117	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
704	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1118	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
705	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;	1119	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
706	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;	1120	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
707	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	1121	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1122	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1123	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
708		1124
709	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1125	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
710	case REQ_FSYNC: req->result = fsync (req->fd); break;	1126	case REQ_FSYNC: req->result = fsync (req->int1); break;
711	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;	1127	case REQ_READDIR: scandir_ (req, self); break;
		1128
		1129	case REQ_BUSY:
		1130	{
		1131	struct timeval tv;
		1132
		1133	tv.tv_sec = req->int1;
		1134	tv.tv_usec = req->int2;
		1135
		1136	req->result = select (0, 0, 0, 0, &tv);
		1137	}
		1138
		1139	case REQ_GROUP:
		1140	case REQ_NOP:
		1141	break;
712		1142
713	case REQ_QUIT:	1143	case REQ_QUIT:
714	break;	1144	goto quit;
715		1145
716	default:	1146	default:
717	req->result = ENOSYS;	1147	req->result = ENOSYS;
718	break;	1148	break;
719	}	1149	}
720		1150
721	req->errorno = errno;	1151	req->errorno = errno;
722		1152
723	pthread_mutex_lock (&reslock);	1153	LOCK (reslock);
724		1154
725	req->next = 0;	1155	++npending;
726		1156
727	if (rese)	1157	if (!reqq_push (&res_queue, req))
728	{
729	rese->next = req;
730	rese = req;
731	}
732	else
733	{
734	rese = ress = req;
735
736	/* write a dummy byte to the pipe so fh becomes ready */	1158	/* write a dummy byte to the pipe so fh becomes ready */
737	write (respipe [1], &respipe, 1);	1159	write (respipe [1], &respipe, 1);
738	}
739		1160
740	pthread_mutex_unlock (&reslock);	1161	self->req = 0;
		1162	worker_clear (self);
		1163
		1164	UNLOCK (reslock);
741	}	1165	}
742	while (type != REQ_QUIT);	1166
		1167	quit:
		1168	LOCK (wrklock);
		1169	worker_free (self);
		1170	UNLOCK (wrklock);
743		1171
744	return 0;	1172	return 0;
745	}	1173	}
746		1174
747	/*****************************************************************************/	1175	/*****************************************************************************/
748		1176
749	static void atfork_prepare (void)	1177	static void atfork_prepare (void)
750	{	1178	{
751	pthread_mutex_lock (&reqlock);	1179	LOCK (wrklock);
752	pthread_mutex_lock (&reslock);	1180	LOCK (reqlock);
		1181	LOCK (reslock);
753	#if !HAVE_PREADWRITE	1182	#if !HAVE_PREADWRITE
754	pthread_mutex_lock (&preadwritelock);	1183	LOCK (preadwritelock);
755	#endif	1184	#endif
756	#if !HAVE_READDIR_R	1185	#if !HAVE_READDIR_R
757	pthread_mutex_lock (&readdirlock);	1186	LOCK (readdirlock);
758	#endif	1187	#endif
759	}	1188	}
760		1189
761	static void atfork_parent (void)	1190	static void atfork_parent (void)
762	{	1191	{
763	#if !HAVE_READDIR_R	1192	#if !HAVE_READDIR_R
764	pthread_mutex_unlock (&readdirlock);	1193	UNLOCK (readdirlock);
765	#endif	1194	#endif
766	#if !HAVE_PREADWRITE	1195	#if !HAVE_PREADWRITE
767	pthread_mutex_unlock (&preadwritelock);	1196	UNLOCK (preadwritelock);
768	#endif	1197	#endif
769	pthread_mutex_unlock (&reslock);	1198	UNLOCK (reslock);
770	pthread_mutex_unlock (&reqlock);	1199	UNLOCK (reqlock);
		1200	UNLOCK (wrklock);
771	}	1201	}
772		1202
773	static void atfork_child (void)	1203	static void atfork_child (void)
774	{	1204	{
775	aio_req prv;	1205	aio_req prv;
776		1206
777	started = 0;	1207	while (prv = reqq_shift (&req_queue))
		1208	req_free (prv);
778		1209
779	while (reqs)	1210	while (prv = reqq_shift (&res_queue))
		1211	req_free (prv);
		1212
		1213	while (wrk_first.next != &wrk_first)
780	{	1214	{
781	prv = reqs;	1215	worker *wrk = wrk_first.next;
782	reqs = prv->next;	1216
		1217	if (wrk->req)
		1218	req_free (wrk->req);
		1219
		1220	worker_clear (wrk);
783	req_free (prv);	1221	worker_free (wrk);
784	}	1222	}
785		1223
786	reqs = reqe = 0;	1224	started = 0;
787		1225	idle = 0;
788	while (ress)	1226	nreqs = 0;
789	{	1227	nready = 0;
790	prv = ress;	1228	npending = 0;
791	ress = prv->next;
792	req_free (prv);
793	}
794
795	ress = rese = 0;
796		1229
797	close (respipe [0]);	1230	close (respipe [0]);
798	close (respipe [1]);	1231	close (respipe [1]);
799	create_pipe ();	1232	create_pipe ();
800		1233
801	atfork_parent ();	1234	atfork_parent ();
802	}	1235	}
803		1236
804	#define dREQ \	1237	#define dREQ \
805	aio_req req; \	1238	aio_req req; \
		1239	int req_pri = next_pri; \
		1240	next_pri = DEFAULT_PRI + PRI_BIAS; \
806	\	1241	\
807	if (SvOK (callback) && !SvROK (callback)) \	1242	if (SvOK (callback) && !SvROK (callback)) \
808	croak ("callback must be undef or of reference type"); \	1243	croak ("callback must be undef or of reference type"); \
809	\	1244	\
810	Newz (0, req, 1, aio_cb); \	1245	Newz (0, req, 1, aio_cb); \
811	if (!req) \	1246	if (!req) \
812	croak ("out of memory during aio_req allocation"); \	1247	croak ("out of memory during aio_req allocation"); \
813	\	1248	\
814	req->callback = newSVsv (callback)	1249	req->callback = newSVsv (callback); \
		1250	req->pri = req_pri
815		1251
816	#define REQ_SEND \	1252	#define REQ_SEND \
817	req_send (req); \	1253	req_send (req); \
818	\	1254	\
819	if (GIMME_V != G_VOID) \	1255	if (GIMME_V != G_VOID) \
…		…
824	PROTOTYPES: ENABLE	1260	PROTOTYPES: ENABLE
825		1261
826	BOOT:	1262	BOOT:
827	{	1263	{
828	HV *stash = gv_stashpv ("IO::AIO", 1);	1264	HV *stash = gv_stashpv ("IO::AIO", 1);
		1265
829	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));	1266	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
830	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));	1267	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
831	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));	1268	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1269	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1270	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1271	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
832		1272
833	create_pipe ();	1273	create_pipe ();
834	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1274	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
835	}	1275	}
836		1276
837	void	1277	void
838	min_parallel (nthreads)	1278	max_poll_reqs (int nreqs)
839	int nthreads
840	PROTOTYPE: $	1279	PROTOTYPE: $
		1280	CODE:
		1281	max_poll_reqs = nreqs;
841		1282
842	void	1283	void
843	max_parallel (nthreads)	1284	max_poll_time (double nseconds)
844	int nthreads
845	PROTOTYPE: $	1285	PROTOTYPE: $
		1286	CODE:
		1287	max_poll_time = nseconds * AIO_TICKS;
		1288
		1289	void
		1290	min_parallel (int nthreads)
		1291	PROTOTYPE: $
		1292
		1293	void
		1294	max_parallel (int nthreads)
		1295	PROTOTYPE: $
		1296
		1297	void
		1298	max_idle (int nthreads)
		1299	PROTOTYPE: $
		1300	CODE:
		1301	set_max_idle (nthreads);
846		1302
847	int	1303	int
848	max_outstanding (nreqs)	1304	max_outstanding (int maxreqs)
849	int nreqs	1305	PROTOTYPE: $
850	PROTOTYPE: $
851	CODE:	1306	CODE:
852	RETVAL = max_outstanding;	1307	RETVAL = max_outstanding;
853	max_outstanding = nreqs;	1308	max_outstanding = maxreqs;
		1309	OUTPUT:
		1310	RETVAL
854		1311
855	void	1312	void
856	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	1313	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
857	SV * pathname	1314	SV * pathname
858	int flags	1315	int flags
…		…
862	PPCODE:	1319	PPCODE:
863	{	1320	{
864	dREQ;	1321	dREQ;
865		1322
866	req->type = REQ_OPEN;	1323	req->type = REQ_OPEN;
867	req->data = newSVsv (pathname);	1324	req->sv1 = newSVsv (pathname);
868	req->dataptr = SvPVbyte_nolen (req->data);	1325	req->ptr1 = SvPVbyte_nolen (pathname);
869	req->fd = flags;	1326	req->int1 = flags;
870	req->mode = mode;	1327	req->mode = mode;
871		1328
872	REQ_SEND;	1329	REQ_SEND;
873	}	1330	}
874		1331
…		…
884	PPCODE:	1341	PPCODE:
885	{	1342	{
886	dREQ;	1343	dREQ;
887		1344
888	req->type = ix;	1345	req->type = ix;
889	req->fh = newSVsv (fh);	1346	req->fh = newSVsv (fh);
890	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1347	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
891		1348
892	REQ_SEND (req);	1349	REQ_SEND (req);
893	}	1350	}
894		1351
895	void	1352	void
…		…
904	aio_read = REQ_READ	1361	aio_read = REQ_READ
905	aio_write = REQ_WRITE	1362	aio_write = REQ_WRITE
906	PROTOTYPE: $$$$$;$	1363	PROTOTYPE: $$$$$;$
907	PPCODE:	1364	PPCODE:
908	{	1365	{
909	aio_req req;
910	STRLEN svlen;	1366	STRLEN svlen;
911	char *svptr = SvPVbyte (data, svlen);	1367	char *svptr = SvPVbyte (data, svlen);
912		1368
913	SvUPGRADE (data, SVt_PV);	1369	SvUPGRADE (data, SVt_PV);
914	SvPOK_on (data);	1370	SvPOK_on (data);
…		…
936		1392
937	{	1393	{
938	dREQ;	1394	dREQ;
939		1395
940	req->type = ix;	1396	req->type = ix;
941	req->fh = newSVsv (fh);	1397	req->fh = newSVsv (fh);
942	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1398	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
943	: IoOFP (sv_2io (fh)));	1399	: IoOFP (sv_2io (fh)));
944	req->offset = offset;	1400	req->offs = offset;
945	req->length = length;	1401	req->size = length;
946	req->data = SvREFCNT_inc (data);	1402	req->sv1 = SvREFCNT_inc (data);
947	req->dataptr = (char *)svptr + dataoffset;	1403	req->ptr1 = (char *)svptr + dataoffset;
		1404	req->stroffset = dataoffset;
948		1405
949	if (!SvREADONLY (data))	1406	if (!SvREADONLY (data))
950	{	1407	{
951	SvREADONLY_on (data);	1408	SvREADONLY_on (data);
952	req->data2ptr = (void *)data;	1409	req->flags |= FLAG_SV1_RO_OFF;
953	}	1410	}
954		1411
955	REQ_SEND;	1412	REQ_SEND;
956	}	1413	}
		1414	}
		1415
		1416	void
		1417	aio_readlink (path,callback=&PL_sv_undef)
		1418	SV * path
		1419	SV * callback
		1420	PROTOTYPE: $$;$
		1421	PPCODE:
		1422	{
		1423	SV *data;
		1424	dREQ;
		1425
		1426	data = newSV (NAME_MAX);
		1427	SvPOK_on (data);
		1428
		1429	req->type = REQ_READLINK;
		1430	req->fh = newSVsv (path);
		1431	req->ptr2 = SvPVbyte_nolen (path);
		1432	req->sv1 = data;
		1433	req->ptr1 = SvPVbyte_nolen (data);
		1434
		1435	REQ_SEND;
957	}	1436	}
958		1437
959	void	1438	void
960	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	1439	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
961	SV * out_fh	1440	SV * out_fh
…		…
967	PPCODE:	1446	PPCODE:
968	{	1447	{
969	dREQ;	1448	dREQ;
970		1449
971	req->type = REQ_SENDFILE;	1450	req->type = REQ_SENDFILE;
972	req->fh = newSVsv (out_fh);	1451	req->fh = newSVsv (out_fh);
973	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1452	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
974	req->fh2 = newSVsv (in_fh);	1453	req->sv2 = newSVsv (in_fh);
975	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1454	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
976	req->offset = in_offset;	1455	req->offs = in_offset;
977	req->length = length;	1456	req->size = length;
978		1457
979	REQ_SEND;	1458	REQ_SEND;
980	}	1459	}
981		1460
982	void	1461	void
…		…
989	PPCODE:	1468	PPCODE:
990	{	1469	{
991	dREQ;	1470	dREQ;
992		1471
993	req->type = REQ_READAHEAD;	1472	req->type = REQ_READAHEAD;
994	req->fh = newSVsv (fh);	1473	req->fh = newSVsv (fh);
995	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1474	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
996	req->offset = offset;	1475	req->offs = offset;
997	req->length = length;	1476	req->size = length;
998		1477
999	REQ_SEND;	1478	REQ_SEND;
1000	}	1479	}
1001		1480
1002	void	1481	void
…		…
1008	aio_lstat = REQ_LSTAT	1487	aio_lstat = REQ_LSTAT
1009	PPCODE:	1488	PPCODE:
1010	{	1489	{
1011	dREQ;	1490	dREQ;
1012		1491
1013	New (0, req->statdata, 1, Stat_t);	1492	req->ptr2 = malloc (sizeof (Stat_t));
1014	if (!req->statdata)	1493	if (!req->ptr2)
1015	{	1494	{
1016	req_free (req);	1495	req_free (req);
1017	croak ("out of memory during aio_req->statdata allocation");	1496	croak ("out of memory during aio_stat statdata allocation");
1018	}	1497	}
		1498
		1499	req->flags |= FLAG_PTR2_FREE;
1019		1500
1020	if (SvPOK (fh_or_path))	1501	if (SvPOK (fh_or_path))
1021	{	1502	{
1022	req->type = ix;	1503	req->type = ix;
1023	req->data = newSVsv (fh_or_path);	1504	req->sv1 = newSVsv (fh_or_path);
1024	req->dataptr = SvPVbyte_nolen (req->data);	1505	req->ptr1 = SvPVbyte_nolen (fh_or_path);
1025	}	1506	}
1026	else	1507	else
1027	{	1508	{
1028	req->type = REQ_FSTAT;	1509	req->type = REQ_FSTAT;
1029	req->fh = newSVsv (fh_or_path);	1510	req->fh = newSVsv (fh_or_path);
1030	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1511	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1031	}	1512	}
1032		1513
1033	REQ_SEND;	1514	REQ_SEND;
1034	}	1515	}
1035		1516
1036	void	1517	void
1037	aio_unlink (pathname,callback=&PL_sv_undef)	1518	aio_unlink (pathname,callback=&PL_sv_undef)
1038	SV * pathname	1519	SV * pathname
1039	SV * callback	1520	SV * callback
1040	ALIAS:	1521	ALIAS:
1041	aio_unlink = REQ_UNLINK	1522	aio_unlink = REQ_UNLINK
1042	aio_rmdir = REQ_RMDIR	1523	aio_rmdir = REQ_RMDIR
1043	aio_readdir = REQ_READDIR	1524	aio_readdir = REQ_READDIR
1044	PPCODE:	1525	PPCODE:
1045	{	1526	{
1046	dREQ;	1527	dREQ;
1047		1528
1048	req->type = ix;	1529	req->type = ix;
1049	req->data = newSVsv (pathname);	1530	req->sv1 = newSVsv (pathname);
1050	req->dataptr = SvPVbyte_nolen (req->data);	1531	req->ptr1 = SvPVbyte_nolen (pathname);
1051		1532
1052	REQ_SEND;	1533	REQ_SEND;
1053	}	1534	}
1054		1535
1055	void	1536	void
1056	aio_link (oldpath,newpath,callback=&PL_sv_undef)	1537	aio_link (oldpath,newpath,callback=&PL_sv_undef)
1057	SV * oldpath	1538	SV * oldpath
1058	SV * newpath	1539	SV * newpath
1059	SV * callback	1540	SV * callback
1060	ALIAS:	1541	ALIAS:
1061	aio_link = REQ_LINK	1542	aio_link = REQ_LINK
1062	aio_symlink = REQ_SYMLINK	1543	aio_symlink = REQ_SYMLINK
1063	aio_rename = REQ_RENAME	1544	aio_rename = REQ_RENAME
1064	PPCODE:	1545	PPCODE:
1065	{	1546	{
1066	dREQ;	1547	dREQ;
1067		1548
1068	req->type = ix;	1549	req->type = ix;
1069	req->fh = newSVsv (oldpath);	1550	req->fh = newSVsv (oldpath);
1070	req->data2ptr = SvPVbyte_nolen (req->fh);	1551	req->ptr2 = SvPVbyte_nolen (req->fh);
1071	req->data = newSVsv (newpath);	1552	req->sv1 = newSVsv (newpath);
1072	req->dataptr = SvPVbyte_nolen (req->data);	1553	req->ptr1 = SvPVbyte_nolen (newpath);
1073		1554
1074	REQ_SEND;	1555	REQ_SEND;
1075	}	1556	}
1076		1557
1077	void	1558	void
		1559	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
		1560	SV * pathname
		1561	SV * callback
		1562	UV mode
		1563	UV dev
		1564	PPCODE:
		1565	{
		1566	dREQ;
		1567
		1568	req->type = REQ_MKNOD;
		1569	req->sv1 = newSVsv (pathname);
		1570	req->ptr1 = SvPVbyte_nolen (pathname);
		1571	req->mode = (mode_t)mode;
		1572	req->offs = dev;
		1573
		1574	REQ_SEND;
		1575	}
		1576
		1577	void
		1578	aio_busy (delay,callback=&PL_sv_undef)
		1579	double delay
		1580	SV * callback
		1581	PPCODE:
		1582	{
		1583	dREQ;
		1584
		1585	req->type = REQ_BUSY;
		1586	req->int1 = delay < 0. ? 0 : delay;
		1587	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
		1588
		1589	REQ_SEND;
		1590	}
		1591
		1592	void
1078	aio_group (callback=&PL_sv_undef)	1593	aio_group (callback=&PL_sv_undef)
1079	SV * callback	1594	SV * callback
1080	PROTOTYPE: ;&	1595	PROTOTYPE: ;$
1081	PPCODE:	1596	PPCODE:
1082	{	1597	{
1083	dREQ;	1598	dREQ;
		1599
1084	req->type = REQ_GROUP;	1600	req->type = REQ_GROUP;
		1601
		1602	req_send (req);
1085	XPUSHs (req_sv (req, AIO_GRP_KLASS));	1603	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1086	}	1604	}
		1605
		1606	void
		1607	aio_nop (callback=&PL_sv_undef)
		1608	SV * callback
		1609	PPCODE:
		1610	{
		1611	dREQ;
		1612
		1613	req->type = REQ_NOP;
		1614
		1615	REQ_SEND;
		1616	}
		1617
		1618	int
		1619	aioreq_pri (int pri = 0)
		1620	PROTOTYPE: ;$
		1621	CODE:
		1622	RETVAL = next_pri - PRI_BIAS;
		1623	if (items > 0)
		1624	{
		1625	if (pri < PRI_MIN) pri = PRI_MIN;
		1626	if (pri > PRI_MAX) pri = PRI_MAX;
		1627	next_pri = pri + PRI_BIAS;
		1628	}
		1629	OUTPUT:
		1630	RETVAL
		1631
		1632	void
		1633	aioreq_nice (int nice = 0)
		1634	CODE:
		1635	nice = next_pri - nice;
		1636	if (nice < PRI_MIN) nice = PRI_MIN;
		1637	if (nice > PRI_MAX) nice = PRI_MAX;
		1638	next_pri = nice + PRI_BIAS;
1087		1639
1088	void	1640	void
1089	flush ()	1641	flush ()
1090	PROTOTYPE:	1642	PROTOTYPE:
1091	CODE:	1643	CODE:
1092	while (nreqs)	1644	while (nreqs)
1093	{	1645	{
1094	poll_wait ();	1646	poll_wait ();
1095	poll_cb ();	1647	poll_cb (0);
1096	}	1648	}
1097		1649
1098	void	1650	void
1099	poll()	1651	poll()
1100	PROTOTYPE:	1652	PROTOTYPE:
1101	CODE:	1653	CODE:
1102	if (nreqs)	1654	if (nreqs)
1103	{	1655	{
1104	poll_wait ();	1656	poll_wait ();
1105	poll_cb ();	1657	poll_cb (0);
1106	}	1658	}
1107		1659
1108	int	1660	int
1109	poll_fileno()	1661	poll_fileno()
1110	PROTOTYPE:	1662	PROTOTYPE:
…		…
1134	CODE:	1686	CODE:
1135	RETVAL = nreqs;	1687	RETVAL = nreqs;
1136	OUTPUT:	1688	OUTPUT:
1137	RETVAL	1689	RETVAL
1138		1690
1139	MODULE = IO::AIO PACKAGE = IO::AIO::REQ	1691	int
1140		1692	nready()
1141	void
1142	cancel (aio_req_ornot req)
1143	PROTOTYPE:	1693	PROTOTYPE:
1144	CODE:	1694	CODE:
1145	req->cancelled = 1;	1695	RETVAL = get_nready ();
		1696	OUTPUT:
		1697	RETVAL
1146		1698
		1699	int
		1700	npending()
		1701	PROTOTYPE:
		1702	CODE:
		1703	RETVAL = get_npending ();
		1704	OUTPUT:
		1705	RETVAL
		1706
		1707	int
		1708	nthreads()
		1709	PROTOTYPE:
		1710	CODE:
		1711	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1712	RETVAL = started;
		1713	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1714	OUTPUT:
		1715	RETVAL
		1716
		1717	PROTOTYPES: DISABLE
		1718
		1719	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1720
		1721	void
		1722	cancel (aio_req_ornot req)
		1723	CODE:
		1724	req_cancel (req);
		1725
		1726	void
		1727	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1728	CODE:
		1729	SvREFCNT_dec (req->callback);
		1730	req->callback = newSVsv (callback);
		1731
		1732	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1733
		1734	void
		1735	add (aio_req grp, ...)
		1736	PPCODE:
		1737	{
		1738	int i;
		1739	aio_req req;
		1740
		1741	if (grp->int1 == 2)
		1742	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1743
		1744	for (i = 1; i < items; ++i )
		1745	{
		1746	if (GIMME_V != G_VOID)
		1747	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1748
		1749	req = SvAIO_REQ (ST (i));
		1750
		1751	if (req)
		1752	{
		1753	++grp->size;
		1754	req->grp = grp;
		1755
		1756	req->grp_prev = 0;
		1757	req->grp_next = grp->grp_first;
		1758
		1759	if (grp->grp_first)
		1760	grp->grp_first->grp_prev = req;
		1761
		1762	grp->grp_first = req;
		1763	}
		1764	}
		1765	}
		1766
		1767	void
		1768	cancel_subs (aio_req_ornot req)
		1769	CODE:
		1770	req_cancel_subs (req);
		1771
		1772	void
		1773	result (aio_req grp, ...)
		1774	CODE:
		1775	{
		1776	int i;
		1777	AV *av;
		1778
		1779	grp->errorno = errno;
		1780
		1781	av = newAV ();
		1782
		1783	for (i = 1; i < items; ++i )
		1784	av_push (av, newSVsv (ST (i)));
		1785
		1786	SvREFCNT_dec (grp->sv1);
		1787	grp->sv1 = (SV *)av;
		1788	}
		1789
		1790	void
		1791	errno (aio_req grp, int errorno = errno)
		1792	CODE:
		1793	grp->errorno = errorno;
		1794
		1795	void
		1796	limit (aio_req grp, int limit)
		1797	CODE:
		1798	grp->int2 = limit;
		1799	aio_grp_feed (grp);
		1800
		1801	void
		1802	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1803	CODE:
		1804	{
		1805	SvREFCNT_dec (grp->sv2);
		1806	grp->sv2 = newSVsv (callback);
		1807
		1808	if (grp->int2 <= 0)
		1809	grp->int2 = 2;
		1810
		1811	aio_grp_feed (grp);
		1812	}
		1813

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