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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.43 by root, Sat Oct 21 23:06:04 2006 UTC vs.
Revision 1.86 by root, Mon Oct 30 23:30:00 2006 UTC

		1	/* solaris */
		2	#define _POSIX_PTHREAD_SEMANTICS 1
		3
		4	#if __linux && !defined(_GNU_SOURCE)
		5	# define _GNU_SOURCE
		6	#endif
		7
		8	/* just in case */
1	#define _REENTRANT 1	9	#define _REENTRANT 1
		10
2	#include <errno.h>	11	#include <errno.h>
3		12
4	#include "EXTERN.h"	13	#include "EXTERN.h"
5	#include "perl.h"	14	#include "perl.h"
6	#include "XSUB.h"	15	#include "XSUB.h"
…		…
9		18
10	#include <pthread.h>	19	#include <pthread.h>
11		20
12	#include <stddef.h>	21	#include <stddef.h>
13	#include <errno.h>	22	#include <errno.h>
		23	#include <sys/time.h>
		24	#include <sys/select.h>
14	#include <sys/types.h>	25	#include <sys/types.h>
15	#include <sys/stat.h>	26	#include <sys/stat.h>
16	#include <limits.h>	27	#include <limits.h>
17	#include <unistd.h>	28	#include <unistd.h>
18	#include <fcntl.h>	29	#include <fcntl.h>
…		…
32	# else	43	# else
33	# error sendfile support requested but not available	44	# error sendfile support requested but not available
34	# endif	45	# endif
35	#endif	46	#endif
36		47
		48	/* number of seconds after which idle threads exit */
		49	#define IDLE_TIMEOUT 10
		50
37	/* used for struct dirent, AIX doesn't provide it */	51	/* used for struct dirent, AIX doesn't provide it */
38	#ifndef NAME_MAX	52	#ifndef NAME_MAX
39	# define NAME_MAX 4096	53	# define NAME_MAX 4096
40	#endif	54	#endif
41		55
		56	#ifndef PTHREAD_STACK_MIN
		57	/* care for broken platforms, e.g. windows */
		58	# define PTHREAD_STACK_MIN 16384
		59	#endif
		60
42	#if __ia64	61	#if __ia64
43	# define STACKSIZE 65536	62	# define STACKSIZE 65536
		63	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		64	# define STACKSIZE PTHREAD_STACK_MIN
44	#else	65	#else
45	# define STACKSIZE 8192	66	# define STACKSIZE 16384
46	#endif	67	#endif
		68
		69	/* wether word reads are potentially non-atomic.
		70	* this is conservatice, likely most arches this runs
		71	* on have atomic word read/writes.
		72	*/
		73	#ifndef WORDACCESS_UNSAFE
		74	# if __i386 || __x86_64
		75	# define WORDACCESS_UNSAFE 0
		76	# else
		77	# define WORDACCESS_UNSAFE 1
		78	# endif
		79	#endif
		80
		81	/* buffer size for various temporary buffers */
		82	#define AIO_BUFSIZE 65536
		83
		84	#define dBUF \
		85	char *aio_buf; \
		86	LOCK (wrklock); \
		87	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		88	UNLOCK (wrklock); \
		89	if (!aio_buf) \
		90	return -1;
47		91
48	enum {	92	enum {
49	REQ_QUIT,	93	REQ_QUIT,
50	REQ_OPEN, REQ_CLOSE,	94	REQ_OPEN, REQ_CLOSE,
51	REQ_READ, REQ_WRITE, REQ_READAHEAD,	95	REQ_READ, REQ_WRITE, REQ_READAHEAD,
52	REQ_SENDFILE,	96	REQ_SENDFILE,
53	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	97	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
54	REQ_FSYNC, REQ_FDATASYNC,	98	REQ_FSYNC, REQ_FDATASYNC,
55	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,	99	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
56	REQ_READDIR,	100	REQ_MKNOD, REQ_READDIR,
57	REQ_LINK, REQ_SYMLINK,	101	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		102	REQ_GROUP, REQ_NOP,
		103	REQ_BUSY,
58	};	104	};
59		105
60	#define AIO_CB_KLASS "IO::AIO::CB"	106	#define AIO_REQ_KLASS "IO::AIO::REQ"
		107	#define AIO_GRP_KLASS "IO::AIO::GRP"
61		108
62	typedef struct aio_cb	109	typedef struct aio_cb
63	{	110	{
64	struct aio_cb *grp_prev, *grp_next;
65	struct aio_grp *grp;
66
67	struct aio_cb *volatile next;	111	struct aio_cb *volatile next;
68		112
		113	SV *callback, *fh;
		114	SV *sv1, *sv2;
		115	void *ptr1, *ptr2;
		116	Stat_t *statdata;
		117	off_t offs;
		118	size_t size;
		119	ssize_t result;
		120
		121	STRLEN stroffset;
		122	int type;
		123	int int1, int2;
		124	int errorno;
		125	mode_t mode; /* open */
		126
		127	unsigned char flags;
		128	unsigned char pri;
		129
69	SV *self; /* the perl counterpart of this request, if any */	130	SV *self; /* the perl counterpart of this request, if any */
70		131	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
71	SV *data, *callback;
72	SV *fh, *fh2;
73	void *dataptr, *data2ptr;
74	Stat_t *statdata;
75	off_t offset;
76	size_t length;
77	ssize_t result;
78
79	int type;
80	int fd, fd2;
81	int errorno;
82	STRLEN dataoffset;
83	mode_t mode; /* open */
84	unsigned char cancelled;
85	} aio_cb;	132	} aio_cb;
		133
		134	enum {
		135	FLAG_CANCELLED = 0x01,
		136	FLAG_DATA_RO_OFF = 0x80, /* data was set readonly */
		137	};
86		138
87	typedef aio_cb *aio_req;	139	typedef aio_cb *aio_req;
88	typedef aio_cb *aio_req_ornot;	140	typedef aio_cb *aio_req_ornot;
89		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
90	static int started, wanted;	165	static unsigned int started, idle, wanted;
91	static volatile int nreqs;	166
92	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;
93	static int respipe [2];	219	static int respipe [2];
94		220
95	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	221	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
96	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	222	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
97	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	223	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
98		224
99	static volatile aio_req reqs, reqe; /* queue start, queue end */	225	#if WORDACCESS_UNSAFE
100	static volatile aio_req ress, rese; /* queue start, queue end */
101		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	*/
102	typedef struct aio_grp	273	typedef struct {
103	{	274	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
104	struct aio_cb *first, *last;	275	int size;
105	SV *callback;	276	} reqq;
106	int busycount;
107	} aio_grp;
108		277
109	static void aio_grp_begin (aio_grp *grp)	278	static reqq req_queue;
110	{	279	static reqq res_queue;
111	++grp->busycount;
112	}
113		280
114	static void aio_grp_end (aio_grp *grp)	281	int reqq_push (reqq *q, aio_req req)
115	{	282	{
116	--grp->busycount;	283	int pri = req->pri;
		284	req->next = 0;
117		285
118	if (grp->busycount)	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)
119	return;	302	return 0;
120		303
121	SvREFCNT_dec (grp->callback);	304	--q->size;
122	grp->callback = 0;
123	}
124		305
125	static aio_grp *aio_grp_new ()	306	for (pri = NUM_PRI; pri--; )
126	{	307	{
127	aio_grp *grp;	308	aio_req req = q->qs[pri];
128		309
129	Newz (0, grp, 1, aio_grp);	310	if (req)
130	aio_grp_begin (grp);	311	{
		312	if (!(q->qs[pri] = req->next))
		313	q->qe[pri] = 0;
131		314
132	return grp;	315	return req;
		316	}
		317	}
		318
		319	abort ();
133	}	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);
134		326
135	/* must be called at most once */	327	/* must be called at most once */
136	static SV *req_sv (aio_req req)	328	static SV *req_sv (aio_req req, const char *klass)
137	{	329	{
		330	if (!req->self)
		331	{
138	req->self = (SV *)newHV ();	332	req->self = (SV *)newHV ();
139	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);	333	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		334	}
140		335
141	return sv_bless (newRV_noinc (req->self), gv_stashpv (AIO_CB_KLASS, 1));	336	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
142	}	337	}
143		338
144	static aio_req SvAIO_REQ (SV *sv)	339	static aio_req SvAIO_REQ (SV *sv)
145	{	340	{
		341	MAGIC *mg;
		342
146	if (!sv_derived_from (sv, AIO_CB_KLASS) || !SvROK (sv))	343	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
147	croak ("object of class " AIO_CB_KLASS " expected");	344	croak ("object of class " AIO_REQ_KLASS " expected");
148		345
149	MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext);	346	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
150		347
151	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_DATA_RO_OFF)
		402	SvREADONLY_off (req->sv1);
		403
		404	if (req->statdata)
		405	{
		406	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		407	PL_laststatval = req->result;
		408	PL_statcache = *(req->statdata);
		409	}
		410
		411	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		412	{
		413	ENTER;
		414	SAVETMPS;
		415	PUSHMARK (SP);
		416	EXTEND (SP, 1);
		417
		418	switch (req->type)
		419	{
		420	case REQ_READDIR:
		421	{
		422	SV *rv = &PL_sv_undef;
		423
		424	if (req->result >= 0)
		425	{
		426	int i;
		427	char *buf = req->ptr2;
		428	AV *av = newAV ();
		429
		430	av_extend (av, req->result - 1);
		431
		432	for (i = 0; i < req->result; ++i)
		433	{
		434	SV *sv = newSVpv (buf, 0);
		435
		436	av_store (av, i, sv);
		437	buf += SvCUR (sv) + 1;
		438	}
		439
		440	rv = sv_2mortal (newRV_noinc ((SV *)av));
		441	}
		442
		443	PUSHs (rv);
		444	}
		445	break;
		446
		447	case REQ_OPEN:
		448	{
		449	/* convert fd to fh */
		450	SV *fh;
		451
		452	PUSHs (sv_2mortal (newSViv (req->result)));
		453	PUTBACK;
		454	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		455	SPAGAIN;
		456
		457	fh = SvREFCNT_inc (POPs);
		458
		459	PUSHMARK (SP);
		460	XPUSHs (sv_2mortal (fh));
		461	}
		462	break;
		463
		464	case REQ_GROUP:
		465	req->int1 = 2; /* mark group as finished */
		466
		467	if (req->sv1)
		468	{
		469	int i;
		470	AV *av = (AV *)req->sv1;
		471
		472	EXTEND (SP, AvFILL (av) + 1);
		473	for (i = 0; i <= AvFILL (av); ++i)
		474	PUSHs (*av_fetch (av, i, 0));
		475	}
		476	break;
		477
		478	case REQ_NOP:
		479	case REQ_BUSY:
		480	break;
		481
		482	case REQ_READLINK:
		483	if (req->result > 0)
		484	{
		485	SvCUR_set (req->sv1, req->result);
		486	*SvEND (req->sv1) = 0;
		487	PUSHs (req->sv1);
		488	}
		489	break;
		490
		491	case REQ_READ:
		492	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		493	*SvEND (req->sv1) = 0;
		494	/* fall through */
		495	default:
		496	PUSHs (sv_2mortal (newSViv (req->result)));
		497	break;
		498	}
		499
		500	errno = req->errorno;
		501
		502	PUTBACK;
		503	call_sv (req->callback, G_VOID | G_EVAL);
		504	SPAGAIN;
		505
		506	FREETMPS;
		507	LEAVE;
		508	}
		509
		510	if (req->grp)
		511	{
		512	aio_req grp = req->grp;
		513
		514	/* unlink request */
		515	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		516	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		517
		518	if (grp->grp_first == req)
		519	grp->grp_first = req->grp_next;
		520
		521	aio_grp_dec (grp);
		522	}
		523
		524	if (SvTRUE (ERRSV))
		525	{
		526	req_free (req);
		527	croak (0);
		528	}
152	}	529	}
153		530
154	static void req_free (aio_req req)	531	static void req_free (aio_req req)
155	{	532	{
156	if (req->self)	533	if (req->self)
157	{	534	{
158	sv_unmagic (req->self, PERL_MAGIC_ext);	535	sv_unmagic (req->self, PERL_MAGIC_ext);
159	SvREFCNT_dec (req->self);	536	SvREFCNT_dec (req->self);
160	}	537	}
161		538
162	if (req->data)
163	SvREFCNT_dec (req->data);
164
165	if (req->fh)
166	SvREFCNT_dec (req->fh);	539	SvREFCNT_dec (req->fh);
167		540	SvREFCNT_dec (req->sv1);
168	if (req->fh2)
169	SvREFCNT_dec (req->fh2);	541	SvREFCNT_dec (req->sv2);
170
171	if (req->statdata)
172	Safefree (req->statdata);
173
174	if (req->callback)
175	SvREFCNT_dec (req->callback);	542	SvREFCNT_dec (req->callback);
		543	Safefree (req->statdata);
176		544
177	if (req->type == REQ_READDIR && req->result >= 0)	545	if (req->type == REQ_READDIR)
178	free (req->data2ptr);	546	free (req->ptr2);
179		547
180	Safefree (req);	548	Safefree (req);
181	}	549	}
182		550
183	static void	551	static void req_cancel_subs (aio_req grp)
184	poll_wait ()
185	{	552	{
186	if (nreqs && !ress)	553	aio_req sub;
		554
		555	if (grp->type != REQ_GROUP)
		556	return;
		557
		558	SvREFCNT_dec (grp->sv2);
		559	grp->sv2 = 0;
		560
		561	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		562	req_cancel (sub);
		563	}
		564
		565	static void req_cancel (aio_req req)
		566	{
		567	req->flags |= FLAG_CANCELLED;
		568
		569	req_cancel_subs (req);
		570	}
		571
		572	static void *aio_proc(void *arg);
		573
		574	static void start_thread (void)
		575	{
		576	sigset_t fullsigset, oldsigset;
		577	pthread_attr_t attr;
		578
		579	worker *wrk = calloc (1, sizeof (worker));
		580
		581	if (!wrk)
		582	croak ("unable to allocate worker thread data");
		583
		584	pthread_attr_init (&attr);
		585	pthread_attr_setstacksize (&attr, STACKSIZE);
		586	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		587	#ifdef PTHREAD_SCOPE_PROCESS
		588	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		589	#endif
		590
		591	sigfillset (&fullsigset);
		592
		593	LOCK (wrklock);
		594	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
		595
		596	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
		597	{
		598	wrk->prev = &wrk_first;
		599	wrk->next = wrk_first.next;
		600	wrk_first.next->prev = wrk;
		601	wrk_first.next = wrk;
		602	++started;
187	{	603	}
		604	else
		605	free (wrk);
		606
		607	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		608	UNLOCK (wrklock);
		609	}
		610
		611	static void maybe_start_thread ()
		612	{
		613	if (get_nthreads () >= wanted)
		614	return;
		615
		616	/* todo: maybe use idle here, but might be less exact */
		617	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		618	return;
		619
		620	start_thread ();
		621	}
		622
		623	static void req_send (aio_req req)
		624	{
		625	++nreqs;
		626
		627	LOCK (reqlock);
		628	++nready;
		629	reqq_push (&req_queue, req);
		630	pthread_cond_signal (&reqwait);
		631	UNLOCK (reqlock);
		632
		633	maybe_start_thread ();
		634	}
		635
		636	static void end_thread (void)
		637	{
		638	aio_req req;
		639
		640	Newz (0, req, 1, aio_cb);
		641
		642	req->type = REQ_QUIT;
		643	req->pri = PRI_MAX + PRI_BIAS;
		644
		645	LOCK (reqlock);
		646	reqq_push (&req_queue, req);
		647	pthread_cond_signal (&reqwait);
		648	UNLOCK (reqlock);
		649
		650	LOCK (wrklock);
		651	--started;
		652	UNLOCK (wrklock);
		653	}
		654
		655	static void set_max_idle (int nthreads)
		656	{
		657	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		658	max_idle = nthreads <= 0 ? 1 : nthreads;
		659	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
		660	}
		661
		662	static void min_parallel (int nthreads)
		663	{
		664	if (wanted < nthreads)
		665	wanted = nthreads;
		666	}
		667
		668	static void max_parallel (int nthreads)
		669	{
		670	if (wanted > nthreads)
		671	wanted = nthreads;
		672
		673	while (started > wanted)
		674	end_thread ();
		675	}
		676
		677	static void poll_wait ()
		678	{
188	fd_set rfd;	679	fd_set rfd;
		680
		681	while (nreqs)
		682	{
		683	int size;
		684	if (WORDACCESS_UNSAFE) LOCK (reslock);
		685	size = res_queue.size;
		686	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		687
		688	if (size)
		689	return;
		690
		691	maybe_start_thread ();
		692
189	FD_ZERO(&rfd);	693	FD_ZERO(&rfd);
190	FD_SET(respipe [0], &rfd);	694	FD_SET(respipe [0], &rfd);
191		695
192	select (respipe [0] + 1, &rfd, 0, 0, 0);	696	select (respipe [0] + 1, &rfd, 0, 0, 0);
193	}	697	}
194	}	698	}
195		699
196	static int	700	static int poll_cb ()
197	poll_cb ()
198	{	701	{
199	dSP;	702	dSP;
200	int count = 0;	703	int count = 0;
		704	int maxreqs = max_poll_reqs;
201	int do_croak = 0;	705	int do_croak = 0;
		706	struct timeval tv_start, tv_now;
202	aio_req req;	707	aio_req req;
203		708
		709	if (max_poll_time)
		710	gettimeofday (&tv_start, 0);
		711
204	for (;;)	712	for (;;)
205	{	713	{
206	pthread_mutex_lock (&reslock);	714	for (;;)
207	req = ress;
208
209	if (req)
210	{	715	{
211	ress = req->next;	716	maybe_start_thread ();
212		717
		718	LOCK (reslock);
		719	req = reqq_shift (&res_queue);
		720
213	if (!ress)	721	if (req)
214	{	722	{
		723	--npending;
		724
		725	if (!res_queue.size)
		726	{
215	/* read any signals sent by the worker threads */	727	/* read any signals sent by the worker threads */
216	char buf [32];	728	char buf [32];
217	while (read (respipe [0], buf, 32) == 32)	729	while (read (respipe [0], buf, 32) == 32)
		730	;
218	;	731	}
219
220	rese = 0;
221	}	732	}
222	}
223		733
224	pthread_mutex_unlock (&reslock);	734	UNLOCK (reslock);
225		735
226	if (!req)	736	if (!req)
227	break;	737	break;
228		738
229	nreqs--;	739	--nreqs;
230		740
231	if (req->type == REQ_QUIT)
232	started--;
233	else
234	{
235	int errorno = errno;
236	errno = req->errorno;
237
238	if (req->type == REQ_READ)	741	if (req->type == REQ_GROUP && req->size)
239	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
240
241	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
242	SvREADONLY_off (req->data);
243
244	if (req->statdata)
245	{	742	{
246	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	743	req->int1 = 1; /* mark request as delayed */
247	PL_laststatval = req->result;	744	continue;
248	PL_statcache = *(req->statdata);
249	}
250
251	ENTER;
252	PUSHMARK (SP);
253
254	if (req->type == REQ_READDIR)
255	{
256	SV *rv = &PL_sv_undef;
257
258	if (req->result >= 0)
259	{
260	char *buf = req->data2ptr;
261	AV *av = newAV ();
262
263	while (req->result)
264	{
265	SV *sv = newSVpv (buf, 0);
266
267	av_push (av, sv);
268	buf += SvCUR (sv) + 1;
269	req->result--;
270	}
271
272	rv = sv_2mortal (newRV_noinc ((SV *)av));
273	}
274
275	XPUSHs (rv);
276	}	745	}
277	else	746	else
278	{	747	{
279	XPUSHs (sv_2mortal (newSViv (req->result)));	748	req_invoke (req);
280		749
281	if (req->type == REQ_OPEN)	750	count++;
282	{
283	/* convert fd to fh */
284	SV *fh;
285
286	PUTBACK;
287	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
288	SPAGAIN;
289
290	fh = SvREFCNT_inc (POPs);
291
292	PUSHMARK (SP);
293	XPUSHs (sv_2mortal (fh));
294	}
295	}	751	}
296		752
297	if (SvOK (req->callback) && !req->cancelled)	753	req_free (req);
		754
		755	if (maxreqs && !--maxreqs)
		756	break;
		757
		758	if (max_poll_time)
298	{	759	{
299	PUTBACK;	760	gettimeofday (&tv_now, 0);
300	call_sv (req->callback, G_VOID | G_EVAL);
301	SPAGAIN;
302		761
303	if (SvTRUE (ERRSV))	762	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
304	{	763	break;
305	req_free (req);
306	croak (0);
307	}
308	}	764	}
309
310	LEAVE;
311
312	errno = errorno;
313	count++;
314	}	765	}
315		766
316	req_free (req);	767	if (nreqs <= max_outstanding)
		768	break;
		769
		770	poll_wait ();
		771
		772	++maxreqs;
317	}	773	}
318		774
319	return count;	775	return count;
320	}
321
322	static void *aio_proc(void *arg);
323
324	static void
325	start_thread (void)
326	{
327	sigset_t fullsigset, oldsigset;
328	pthread_t tid;
329	pthread_attr_t attr;
330
331	pthread_attr_init (&attr);
332	pthread_attr_setstacksize (&attr, STACKSIZE);
333	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
334
335	sigfillset (&fullsigset);
336	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
337
338	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
339	started++;
340
341	sigprocmask (SIG_SETMASK, &oldsigset, 0);
342	}
343
344	static void
345	req_send (aio_req req)
346	{
347	while (started < wanted && nreqs >= started)
348	start_thread ();
349
350	nreqs++;
351
352	pthread_mutex_lock (&reqlock);
353
354	req->next = 0;
355
356	if (reqe)
357	{
358	reqe->next = req;
359	reqe = req;
360	}
361	else
362	reqe = reqs = req;
363
364	pthread_cond_signal (&reqwait);
365	pthread_mutex_unlock (&reqlock);
366
367	if (nreqs > max_outstanding)
368	for (;;)
369	{
370	poll_cb ();
371
372	if (nreqs <= max_outstanding)
373	break;
374
375	poll_wait ();
376	}
377	}
378
379	static void
380	end_thread (void)
381	{
382	aio_req req;
383	Newz (0, req, 1, aio_cb);
384	req->type = REQ_QUIT;
385
386	req_send (req);
387	}
388
389	static void min_parallel (int nthreads)
390	{
391	if (wanted < nthreads)
392	wanted = nthreads;
393	}
394
395	static void max_parallel (int nthreads)
396	{
397	int cur = started;
398
399	if (wanted > nthreads)
400	wanted = nthreads;
401
402	while (cur > wanted)
403	{
404	end_thread ();
405	cur--;
406	}
407
408	while (started > wanted)
409	{
410	poll_wait ();
411	poll_cb ();
412	}
413	}	776	}
414		777
415	static void create_pipe ()	778	static void create_pipe ()
416	{	779	{
417	if (pipe (respipe))	780	if (pipe (respipe))
…		…
436	* normal read/write by using a mutex. slows down execution a lot,	799	* normal read/write by using a mutex. slows down execution a lot,
437	* but that's your problem, not mine.	800	* but that's your problem, not mine.
438	*/	801	*/
439	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;	802	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
440		803
441	static ssize_t	804	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
442	pread (int fd, void *buf, size_t count, off_t offset)
443	{	805	{
444	ssize_t res;	806	ssize_t res;
445	off_t ooffset;	807	off_t ooffset;
446		808
447	pthread_mutex_lock (&preadwritelock);	809	LOCK (preadwritelock);
448	ooffset = lseek (fd, 0, SEEK_CUR);	810	ooffset = lseek (fd, 0, SEEK_CUR);
449	lseek (fd, offset, SEEK_SET);	811	lseek (fd, offset, SEEK_SET);
450	res = read (fd, buf, count);	812	res = read (fd, buf, count);
451	lseek (fd, ooffset, SEEK_SET);	813	lseek (fd, ooffset, SEEK_SET);
452	pthread_mutex_unlock (&preadwritelock);	814	UNLOCK (preadwritelock);
453		815
454	return res;	816	return res;
455	}	817	}
456		818
457	static ssize_t
458	pwrite (int fd, void *buf, size_t count, off_t offset)	819	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
459	{	820	{
460	ssize_t res;	821	ssize_t res;
461	off_t ooffset;	822	off_t ooffset;
462		823
463	pthread_mutex_lock (&preadwritelock);	824	LOCK (preadwritelock);
464	ooffset = lseek (fd, 0, SEEK_CUR);	825	ooffset = lseek (fd, 0, SEEK_CUR);
465	lseek (fd, offset, SEEK_SET);	826	lseek (fd, offset, SEEK_SET);
466	res = write (fd, buf, count);	827	res = write (fd, buf, count);
467	lseek (fd, offset, SEEK_SET);	828	lseek (fd, offset, SEEK_SET);
468	pthread_mutex_unlock (&preadwritelock);	829	UNLOCK (preadwritelock);
469		830
470	return res;	831	return res;
471	}	832	}
472	#endif	833	#endif
473		834
474	#if !HAVE_FDATASYNC	835	#if !HAVE_FDATASYNC
475	# define fdatasync fsync	836	# define fdatasync fsync
476	#endif	837	#endif
477		838
478	#if !HAVE_READAHEAD	839	#if !HAVE_READAHEAD
479	# define readahead aio_readahead	840	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
480		841
481	static ssize_t	842	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
482	readahead (int fd, off_t offset, size_t count)
483	{	843	{
484	char readahead_buf[4096];	844	dBUF;
485		845
486	while (count > 0)	846	while (count > 0)
487	{	847	{
488	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	848	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
489		849
490	pread (fd, readahead_buf, len, offset);	850	pread (fd, aio_buf, len, offset);
491	offset += len;	851	offset += len;
492	count -= len;	852	count -= len;
493	}	853	}
494		854
495	errno = 0;	855	errno = 0;
496	}	856	}
		857
497	#endif	858	#endif
498		859
499	#if !HAVE_READDIR_R	860	#if !HAVE_READDIR_R
500	# define readdir_r aio_readdir_r	861	# define readdir_r aio_readdir_r
501		862
502	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;	863	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
503		864
504	static int
505	readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)	865	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
506	{	866	{
507	struct dirent *e;	867	struct dirent *e;
508	int errorno;	868	int errorno;
509		869
510	pthread_mutex_lock (&readdirlock);	870	LOCK (readdirlock);
511		871
512	e = readdir (dirp);	872	e = readdir (dirp);
513	errorno = errno;	873	errorno = errno;
514		874
515	if (e)	875	if (e)
…		…
518	strcpy (ent->d_name, e->d_name);	878	strcpy (ent->d_name, e->d_name);
519	}	879	}
520	else	880	else
521	*res = 0;	881	*res = 0;
522		882
523	pthread_mutex_unlock (&readdirlock);	883	UNLOCK (readdirlock);
524		884
525	errno = errorno;	885	errno = errorno;
526	return e ? 0 : -1;	886	return e ? 0 : -1;
527	}	887	}
528	#endif	888	#endif
529		889
530	/* sendfile always needs emulation */	890	/* sendfile always needs emulation */
531	static ssize_t
532	sendfile_ (int ofd, int ifd, off_t offset, size_t count)	891	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
533	{	892	{
534	ssize_t res;	893	ssize_t res;
535		894
536	if (!count)	895	if (!count)
537	return 0;	896	return 0;
…		…
548	{	907	{
549	off_t sbytes;	908	off_t sbytes;
550	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	909	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
551		910
552	if (res < 0 && sbytes)	911	if (res < 0 && sbytes)
553	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	912	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
554	res = sbytes;	913	res = sbytes;
555	}	914	}
556		915
557	# elif __hpux	916	# elif __hpux
558	res = sendfile (ofd, ifd, offset, count, 0, 0);	917	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
586	#endif	945	#endif
587	)	946	)
588	)	947	)
589	{	948	{
590	/* emulate sendfile. this is a major pain in the ass */	949	/* emulate sendfile. this is a major pain in the ass */
591	char buf[4096];	950	dBUF;
		951
592	res = 0;	952	res = 0;
593		953
594	while (count)	954	while (count)
595	{	955	{
596	ssize_t cnt;	956	ssize_t cnt;
597		957
598	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	958	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
599		959
600	if (cnt <= 0)	960	if (cnt <= 0)
601	{	961	{
602	if (cnt && !res) res = -1;	962	if (cnt && !res) res = -1;
603	break;	963	break;
604	}	964	}
605		965
606	cnt = write (ofd, buf, cnt);	966	cnt = write (ofd, aio_buf, cnt);
607		967
608	if (cnt <= 0)	968	if (cnt <= 0)
609	{	969	{
610	if (cnt && !res) res = -1;	970	if (cnt && !res) res = -1;
611	break;	971	break;
…		…
619		979
620	return res;	980	return res;
621	}	981	}
622		982
623	/* read a full directory */	983	/* read a full directory */
624	static int	984	static void scandir_ (aio_req req, worker *self)
625	scandir_ (const char *path, void **namesp)
626	{	985	{
627	DIR *dirp = opendir (path);	986	DIR *dirp;
628	union	987	union
629	{	988	{
630	struct dirent d;	989	struct dirent d;
631	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	990	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
632	} u;	991	} *u;
633	struct dirent *entp;	992	struct dirent *entp;
634	char *name, *names;	993	char *name, *names;
635	int memlen = 4096;	994	int memlen = 4096;
636	int memofs = 0;	995	int memofs = 0;
637	int res = 0;	996	int res = 0;
638	int errorno;	997	int errorno;
639		998
640	if (!dirp)	999	LOCK (wrklock);
641	return -1;	1000	self->dirp = dirp = opendir (req->ptr1);
642		1001	self->dbuf = u = malloc (sizeof (*u));
643	names = malloc (memlen);	1002	req->ptr2 = names = malloc (memlen);
		1003	UNLOCK (wrklock);
		1004
		1005	if (dirp && u && names)
		1006	for (;;)
		1007	{
		1008	errno = 0;
		1009	readdir_r (dirp, &u->d, &entp);
		1010
		1011	if (!entp)
		1012	break;
		1013
		1014	name = entp->d_name;
		1015
		1016	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1017	{
		1018	int len = strlen (name) + 1;
		1019
		1020	res++;
		1021
		1022	while (memofs + len > memlen)
		1023	{
		1024	memlen *= 2;
		1025	LOCK (wrklock);
		1026	req->ptr2 = names = realloc (names, memlen);
		1027	UNLOCK (wrklock);
		1028
		1029	if (!names)
		1030	break;
		1031	}
		1032
		1033	memcpy (names + memofs, name, len);
		1034	memofs += len;
		1035	}
		1036	}
		1037
		1038	if (errno)
		1039	res = -1;
		1040
		1041	req->result = res;
		1042	}
		1043
		1044	/*****************************************************************************/
		1045
		1046	static void *aio_proc (void *thr_arg)
		1047	{
		1048	aio_req req;
		1049	struct timespec ts;
		1050	worker *self = (worker *)thr_arg;
		1051
		1052	/* try to distribute timeouts somewhat evenly */
		1053	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1054	* (1000000000UL / 1024UL);
644		1055
645	for (;;)	1056	for (;;)
646	{	1057	{
647	errno = 0, readdir_r (dirp, &u.d, &entp);	1058	ts.tv_sec = time (0) + IDLE_TIMEOUT;
648		1059
649	if (!entp)	1060	LOCK (reqlock);
650	break;
651
652	name = entp->d_name;
653
654	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
655	{
656	int len = strlen (name) + 1;
657
658	res++;
659
660	while (memofs + len > memlen)
661	{
662	memlen *= 2;
663	names = realloc (names, memlen);
664	if (!names)
665	break;
666	}
667
668	memcpy (names + memofs, name, len);
669	memofs += len;
670	}
671	}
672
673	errorno = errno;
674	closedir (dirp);
675
676	if (errorno)
677	{
678	free (names);
679	errno = errorno;
680	res = -1;
681	}
682
683	*namesp = (void *)names;
684	return res;
685	}
686
687	/*****************************************************************************/
688
689	static void *
690	aio_proc (void *thr_arg)
691	{
692	aio_req req;
693	int type;
694
695	do
696	{
697	pthread_mutex_lock (&reqlock);
698		1061
699	for (;;)	1062	for (;;)
700	{	1063	{
701	req = reqs;	1064	self->req = req = reqq_shift (&req_queue);
702
703	if (reqs)
704	{
705	reqs = reqs->next;
706	if (!reqs) reqe = 0;
707	}
708		1065
709	if (req)	1066	if (req)
710	break;	1067	break;
711		1068
		1069	++idle;
		1070
		1071	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1072	== ETIMEDOUT)
		1073	{
		1074	if (idle > max_idle)
		1075	{
		1076	--idle;
		1077	UNLOCK (reqlock);
		1078	LOCK (wrklock);
		1079	--started;
		1080	UNLOCK (wrklock);
		1081	goto quit;
		1082	}
		1083
		1084	/* we are allowed to idle, so do so without any timeout */
712	pthread_cond_wait (&reqwait, &reqlock);	1085	pthread_cond_wait (&reqwait, &reqlock);
		1086	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1087	}
		1088
		1089	--idle;
713	}	1090	}
714		1091
715	pthread_mutex_unlock (&reqlock);	1092	--nready;
		1093
		1094	UNLOCK (reqlock);
716		1095
717	errno = 0; /* strictly unnecessary */	1096	errno = 0; /* strictly unnecessary */
718		1097
719	if (!req->cancelled)	1098	if (!(req->flags & FLAG_CANCELLED))
720	switch (req->type)	1099	switch (req->type)
721	{	1100	{
722	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	1101	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
723	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	1102	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
724		1103
725	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	1104	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
726	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;	1105	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
727		1106
728	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1107	case REQ_STAT: req->result = stat (req->ptr1, req->statdata); break;
729	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1108	case REQ_LSTAT: req->result = lstat (req->ptr1, req->statdata); break;
730	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1109	case REQ_FSTAT: req->result = fstat (req->int1, req->statdata); break;
731		1110
732	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	1111	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
733	case REQ_CLOSE: req->result = close (req->fd); break;	1112	case REQ_CLOSE: req->result = close (req->int1); break;
734	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1113	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
735	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1114	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
736	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;	1115	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
737	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;	1116	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
738	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	1117	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1118	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1119	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
739		1120
740	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1121	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
741	case REQ_FSYNC: req->result = fsync (req->fd); break;	1122	case REQ_FSYNC: req->result = fsync (req->int1); break;
742	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;	1123	case REQ_READDIR: scandir_ (req, self); break;
		1124
		1125	case REQ_BUSY:
		1126	{
		1127	struct timeval tv;
		1128
		1129	tv.tv_sec = req->int1;
		1130	tv.tv_usec = req->int2;
		1131
		1132	req->result = select (0, 0, 0, 0, &tv);
		1133	}
		1134
		1135	case REQ_GROUP:
		1136	case REQ_NOP:
		1137	break;
743		1138
744	case REQ_QUIT:	1139	case REQ_QUIT:
745	break;	1140	goto quit;
746		1141
747	default:	1142	default:
748	req->result = ENOSYS;	1143	req->result = ENOSYS;
749	break;	1144	break;
750	}	1145	}
751		1146
752	req->errorno = errno;	1147	req->errorno = errno;
753		1148
754	pthread_mutex_lock (&reslock);	1149	LOCK (reslock);
755		1150
756	req->next = 0;	1151	++npending;
757		1152
758	if (rese)	1153	if (!reqq_push (&res_queue, req))
759	{
760	rese->next = req;
761	rese = req;
762	}
763	else
764	{
765	rese = ress = req;
766
767	/* write a dummy byte to the pipe so fh becomes ready */	1154	/* write a dummy byte to the pipe so fh becomes ready */
768	write (respipe [1], &respipe, 1);	1155	write (respipe [1], &respipe, 1);
769	}
770		1156
771	pthread_mutex_unlock (&reslock);	1157	self->req = 0;
		1158	worker_clear (self);
		1159
		1160	UNLOCK (reslock);
772	}	1161	}
773	while (type != REQ_QUIT);	1162
		1163	quit:
		1164	LOCK (wrklock);
		1165	worker_free (self);
		1166	UNLOCK (wrklock);
774		1167
775	return 0;	1168	return 0;
776	}	1169	}
777		1170
778	/*****************************************************************************/	1171	/*****************************************************************************/
779		1172
780	static void atfork_prepare (void)	1173	static void atfork_prepare (void)
781	{	1174	{
782	pthread_mutex_lock (&reqlock);	1175	LOCK (wrklock);
783	pthread_mutex_lock (&reslock);	1176	LOCK (reqlock);
		1177	LOCK (reslock);
784	#if !HAVE_PREADWRITE	1178	#if !HAVE_PREADWRITE
785	pthread_mutex_lock (&preadwritelock);	1179	LOCK (preadwritelock);
786	#endif	1180	#endif
787	#if !HAVE_READDIR_R	1181	#if !HAVE_READDIR_R
788	pthread_mutex_lock (&readdirlock);	1182	LOCK (readdirlock);
789	#endif	1183	#endif
790	}	1184	}
791		1185
792	static void atfork_parent (void)	1186	static void atfork_parent (void)
793	{	1187	{
794	#if !HAVE_READDIR_R	1188	#if !HAVE_READDIR_R
795	pthread_mutex_unlock (&readdirlock);	1189	UNLOCK (readdirlock);
796	#endif	1190	#endif
797	#if !HAVE_PREADWRITE	1191	#if !HAVE_PREADWRITE
798	pthread_mutex_unlock (&preadwritelock);	1192	UNLOCK (preadwritelock);
799	#endif	1193	#endif
800	pthread_mutex_unlock (&reslock);	1194	UNLOCK (reslock);
801	pthread_mutex_unlock (&reqlock);	1195	UNLOCK (reqlock);
		1196	UNLOCK (wrklock);
802	}	1197	}
803		1198
804	static void atfork_child (void)	1199	static void atfork_child (void)
805	{	1200	{
806	aio_req prv;	1201	aio_req prv;
807		1202
		1203	while (prv = reqq_shift (&req_queue))
		1204	req_free (prv);
		1205
		1206	while (prv = reqq_shift (&res_queue))
		1207	req_free (prv);
		1208
		1209	while (wrk_first.next != &wrk_first)
		1210	{
		1211	worker *wrk = wrk_first.next;
		1212
		1213	if (wrk->req)
		1214	req_free (wrk->req);
		1215
		1216	worker_clear (wrk);
		1217	worker_free (wrk);
		1218	}
		1219
808	started = 0;	1220	started = 0;
809		1221	idle = 0;
810	while (reqs)	1222	nreqs = 0;
811	{	1223	nready = 0;
812	prv = reqs;	1224	npending = 0;
813	reqs = prv->next;
814	req_free (prv);
815	}
816
817	reqs = reqe = 0;
818
819	while (ress)
820	{
821	prv = ress;
822	ress = prv->next;
823	req_free (prv);
824	}
825
826	ress = rese = 0;
827		1225
828	close (respipe [0]);	1226	close (respipe [0]);
829	close (respipe [1]);	1227	close (respipe [1]);
830	create_pipe ();	1228	create_pipe ();
831		1229
832	atfork_parent ();	1230	atfork_parent ();
833	}	1231	}
834		1232
835	#define dREQ \	1233	#define dREQ \
836	aio_req req; \	1234	aio_req req; \
		1235	int req_pri = next_pri; \
		1236	next_pri = DEFAULT_PRI + PRI_BIAS; \
837	\	1237	\
838	if (SvOK (callback) && !SvROK (callback)) \	1238	if (SvOK (callback) && !SvROK (callback)) \
839	croak ("callback must be undef or of reference type"); \	1239	croak ("callback must be undef or of reference type"); \
840	\	1240	\
841	Newz (0, req, 1, aio_cb); \	1241	Newz (0, req, 1, aio_cb); \
842	if (!req) \	1242	if (!req) \
843	croak ("out of memory during aio_req allocation"); \	1243	croak ("out of memory during aio_req allocation"); \
844	\	1244	\
845	req->callback = newSVsv (callback)	1245	req->callback = newSVsv (callback); \
		1246	req->pri = req_pri
846		1247
847	#define REQ_SEND \	1248	#define REQ_SEND \
848	req_send (req); \	1249	req_send (req); \
849	\	1250	\
850	if (GIMME_V != G_VOID) \	1251	if (GIMME_V != G_VOID) \
851	XPUSHs (req_sv (req));	1252	XPUSHs (req_sv (req, AIO_REQ_KLASS));
852		1253
853	MODULE = IO::AIO PACKAGE = IO::AIO	1254	MODULE = IO::AIO PACKAGE = IO::AIO
854		1255
855	PROTOTYPES: ENABLE	1256	PROTOTYPES: ENABLE
856		1257
857	BOOT:	1258	BOOT:
858	{	1259	{
859	HV *stash = gv_stashpv ("IO::AIO", 1);	1260	HV *stash = gv_stashpv ("IO::AIO", 1);
		1261
860	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));	1262	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
861	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));	1263	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
862	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));	1264	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1265	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1266	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1267	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
863		1268
864	create_pipe ();	1269	create_pipe ();
865	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1270	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
866	}	1271	}
867		1272
868	void	1273	void
869	min_parallel (nthreads)	1274	max_poll_reqs (int nreqs)
870	int nthreads
871	PROTOTYPE: $	1275	PROTOTYPE: $
		1276	CODE:
		1277	max_poll_reqs = nreqs;
872		1278
873	void	1279	void
874	max_parallel (nthreads)	1280	max_poll_time (double nseconds)
875	int nthreads
876	PROTOTYPE: $	1281	PROTOTYPE: $
		1282	CODE:
		1283	max_poll_time = nseconds * AIO_TICKS;
		1284
		1285	void
		1286	min_parallel (int nthreads)
		1287	PROTOTYPE: $
		1288
		1289	void
		1290	max_parallel (int nthreads)
		1291	PROTOTYPE: $
		1292
		1293	void
		1294	max_idle (int nthreads)
		1295	PROTOTYPE: $
		1296	CODE:
		1297	set_max_idle (nthreads);
877		1298
878	int	1299	int
879	max_outstanding (nreqs)	1300	max_outstanding (int maxreqs)
880	int nreqs	1301	PROTOTYPE: $
881	PROTOTYPE: $
882	CODE:	1302	CODE:
883	RETVAL = max_outstanding;	1303	RETVAL = max_outstanding;
884	max_outstanding = nreqs;	1304	max_outstanding = maxreqs;
		1305	OUTPUT:
		1306	RETVAL
885		1307
886	void	1308	void
887	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	1309	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
888	SV * pathname	1310	SV * pathname
889	int flags	1311	int flags
…		…
893	PPCODE:	1315	PPCODE:
894	{	1316	{
895	dREQ;	1317	dREQ;
896		1318
897	req->type = REQ_OPEN;	1319	req->type = REQ_OPEN;
898	req->data = newSVsv (pathname);	1320	req->sv1 = newSVsv (pathname);
899	req->dataptr = SvPVbyte_nolen (req->data);	1321	req->ptr1 = SvPVbyte_nolen (pathname);
900	req->fd = flags;	1322	req->int1 = flags;
901	req->mode = mode;	1323	req->mode = mode;
902		1324
903	REQ_SEND;	1325	REQ_SEND;
904	}	1326	}
905		1327
…		…
915	PPCODE:	1337	PPCODE:
916	{	1338	{
917	dREQ;	1339	dREQ;
918		1340
919	req->type = ix;	1341	req->type = ix;
920	req->fh = newSVsv (fh);	1342	req->fh = newSVsv (fh);
921	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1343	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
922		1344
923	REQ_SEND (req);	1345	REQ_SEND (req);
924	}	1346	}
925		1347
926	void	1348	void
…		…
935	aio_read = REQ_READ	1357	aio_read = REQ_READ
936	aio_write = REQ_WRITE	1358	aio_write = REQ_WRITE
937	PROTOTYPE: $$$$$;$	1359	PROTOTYPE: $$$$$;$
938	PPCODE:	1360	PPCODE:
939	{	1361	{
940	aio_req req;
941	STRLEN svlen;	1362	STRLEN svlen;
942	char *svptr = SvPVbyte (data, svlen);	1363	char *svptr = SvPVbyte (data, svlen);
943		1364
944	SvUPGRADE (data, SVt_PV);	1365	SvUPGRADE (data, SVt_PV);
945	SvPOK_on (data);	1366	SvPOK_on (data);
…		…
967		1388
968	{	1389	{
969	dREQ;	1390	dREQ;
970		1391
971	req->type = ix;	1392	req->type = ix;
972	req->fh = newSVsv (fh);	1393	req->fh = newSVsv (fh);
973	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1394	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
974	: IoOFP (sv_2io (fh)));	1395	: IoOFP (sv_2io (fh)));
975	req->offset = offset;	1396	req->offs = offset;
976	req->length = length;	1397	req->size = length;
977	req->data = SvREFCNT_inc (data);	1398	req->sv1 = SvREFCNT_inc (data);
978	req->dataptr = (char *)svptr + dataoffset;	1399	req->ptr1 = (char *)svptr + dataoffset;
		1400	req->stroffset = dataoffset;
979		1401
980	if (!SvREADONLY (data))	1402	if (!SvREADONLY (data))
981	{	1403	{
982	SvREADONLY_on (data);	1404	SvREADONLY_on (data);
983	req->data2ptr = (void *)data;	1405	req->flags |= FLAG_DATA_RO_OFF;
984	}	1406	}
985		1407
986	REQ_SEND;	1408	REQ_SEND;
987	}	1409	}
		1410	}
		1411
		1412	void
		1413	aio_readlink (path,callback=&PL_sv_undef)
		1414	SV * path
		1415	SV * callback
		1416	PROTOTYPE: $$;$
		1417	PPCODE:
		1418	{
		1419	SV *data;
		1420	dREQ;
		1421
		1422	data = newSV (NAME_MAX);
		1423	SvPOK_on (data);
		1424
		1425	req->type = REQ_READLINK;
		1426	req->fh = newSVsv (path);
		1427	req->ptr2 = SvPVbyte_nolen (path);
		1428	req->sv1 = data;
		1429	req->ptr1 = SvPVbyte_nolen (data);
		1430
		1431	REQ_SEND;
988	}	1432	}
989		1433
990	void	1434	void
991	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	1435	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
992	SV * out_fh	1436	SV * out_fh
…		…
998	PPCODE:	1442	PPCODE:
999	{	1443	{
1000	dREQ;	1444	dREQ;
1001		1445
1002	req->type = REQ_SENDFILE;	1446	req->type = REQ_SENDFILE;
1003	req->fh = newSVsv (out_fh);	1447	req->fh = newSVsv (out_fh);
1004	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1448	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
1005	req->fh2 = newSVsv (in_fh);	1449	req->sv2 = newSVsv (in_fh);
1006	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1450	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
1007	req->offset = in_offset;	1451	req->offs = in_offset;
1008	req->length = length;	1452	req->size = length;
1009		1453
1010	REQ_SEND;	1454	REQ_SEND;
1011	}	1455	}
1012		1456
1013	void	1457	void
…		…
1020	PPCODE:	1464	PPCODE:
1021	{	1465	{
1022	dREQ;	1466	dREQ;
1023		1467
1024	req->type = REQ_READAHEAD;	1468	req->type = REQ_READAHEAD;
1025	req->fh = newSVsv (fh);	1469	req->fh = newSVsv (fh);
1026	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1470	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
1027	req->offset = offset;	1471	req->offs = offset;
1028	req->length = length;	1472	req->size = length;
1029		1473
1030	REQ_SEND;	1474	REQ_SEND;
1031	}	1475	}
1032		1476
1033	void	1477	void
…		…
1049	}	1493	}
1050		1494
1051	if (SvPOK (fh_or_path))	1495	if (SvPOK (fh_or_path))
1052	{	1496	{
1053	req->type = ix;	1497	req->type = ix;
1054	req->data = newSVsv (fh_or_path);	1498	req->sv1 = newSVsv (fh_or_path);
1055	req->dataptr = SvPVbyte_nolen (req->data);	1499	req->ptr1 = SvPVbyte_nolen (fh_or_path);
1056	}	1500	}
1057	else	1501	else
1058	{	1502	{
1059	req->type = REQ_FSTAT;	1503	req->type = REQ_FSTAT;
1060	req->fh = newSVsv (fh_or_path);	1504	req->fh = newSVsv (fh_or_path);
1061	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1505	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1062	}	1506	}
1063		1507
1064	REQ_SEND;	1508	REQ_SEND;
1065	}	1509	}
1066		1510
1067	void	1511	void
1068	aio_unlink (pathname,callback=&PL_sv_undef)	1512	aio_unlink (pathname,callback=&PL_sv_undef)
1069	SV * pathname	1513	SV * pathname
1070	SV * callback	1514	SV * callback
1071	ALIAS:	1515	ALIAS:
1072	aio_unlink = REQ_UNLINK	1516	aio_unlink = REQ_UNLINK
1073	aio_rmdir = REQ_RMDIR	1517	aio_rmdir = REQ_RMDIR
1074	aio_readdir = REQ_READDIR	1518	aio_readdir = REQ_READDIR
1075	PPCODE:	1519	PPCODE:
1076	{	1520	{
1077	dREQ;	1521	dREQ;
1078		1522
1079	req->type = ix;	1523	req->type = ix;
1080	req->data = newSVsv (pathname);	1524	req->sv1 = newSVsv (pathname);
1081	req->dataptr = SvPVbyte_nolen (req->data);	1525	req->ptr1 = SvPVbyte_nolen (pathname);
1082		1526
1083	REQ_SEND;	1527	REQ_SEND;
1084	}	1528	}
1085		1529
1086	void	1530	void
1087	aio_link (oldpath,newpath,callback=&PL_sv_undef)	1531	aio_link (oldpath,newpath,callback=&PL_sv_undef)
1088	SV * oldpath	1532	SV * oldpath
1089	SV * newpath	1533	SV * newpath
1090	SV * callback	1534	SV * callback
1091	ALIAS:	1535	ALIAS:
1092	aio_link = REQ_LINK	1536	aio_link = REQ_LINK
1093	aio_symlink = REQ_SYMLINK	1537	aio_symlink = REQ_SYMLINK
1094	aio_rename = REQ_RENAME	1538	aio_rename = REQ_RENAME
1095	PPCODE:	1539	PPCODE:
1096	{	1540	{
1097	dREQ;	1541	dREQ;
1098		1542
1099	req->type = ix;	1543	req->type = ix;
1100	req->fh = newSVsv (oldpath);	1544	req->fh = newSVsv (oldpath);
1101	req->data2ptr = SvPVbyte_nolen (req->fh);	1545	req->ptr2 = SvPVbyte_nolen (req->fh);
1102	req->data = newSVsv (newpath);	1546	req->sv1 = newSVsv (newpath);
1103	req->dataptr = SvPVbyte_nolen (req->data);	1547	req->ptr1 = SvPVbyte_nolen (newpath);
1104		1548
1105	REQ_SEND;	1549	REQ_SEND;
1106	}	1550	}
1107		1551
1108	#if 0
1109
1110	# undocumented, because it does not cancel active requests
1111	void	1552	void
1112	cancel_most_requests ()	1553	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
		1554	SV * pathname
		1555	SV * callback
		1556	UV mode
		1557	UV dev
		1558	PPCODE:
		1559	{
		1560	dREQ;
		1561
		1562	req->type = REQ_MKNOD;
		1563	req->sv1 = newSVsv (pathname);
		1564	req->ptr1 = SvPVbyte_nolen (pathname);
		1565	req->mode = (mode_t)mode;
		1566	req->offs = dev;
		1567
		1568	REQ_SEND;
		1569	}
		1570
		1571	void
		1572	aio_busy (delay,callback=&PL_sv_undef)
		1573	double delay
		1574	SV * callback
		1575	PPCODE:
		1576	{
		1577	dREQ;
		1578
		1579	req->type = REQ_BUSY;
		1580	req->int1 = delay < 0. ? 0 : delay;
		1581	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
		1582
		1583	REQ_SEND;
		1584	}
		1585
		1586	void
		1587	aio_group (callback=&PL_sv_undef)
		1588	SV * callback
1113	PROTOTYPE:	1589	PROTOTYPE: ;$
1114	CODE:	1590	PPCODE:
1115	{	1591	{
1116	aio_req *req;	1592	dREQ;
1117		1593
1118	pthread_mutex_lock (&reqlock);	1594	req->type = REQ_GROUP;
1119	for (req = reqs; req; req = req->next)
1120	req->flags |= 1;
1121	pthread_mutex_unlock (&reqlock);
1122		1595
1123	pthread_mutex_lock (&reslock);	1596	req_send (req);
1124	for (req = ress; req; req = req->next)	1597	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1125	req->flags |= 1;
1126	pthread_mutex_unlock (&reslock);
1127	}	1598	}
1128		1599
1129	#endif	1600	void
		1601	aio_nop (callback=&PL_sv_undef)
		1602	SV * callback
		1603	PPCODE:
		1604	{
		1605	dREQ;
		1606
		1607	req->type = REQ_NOP;
		1608
		1609	REQ_SEND;
		1610	}
		1611
		1612	int
		1613	aioreq_pri (int pri = 0)
		1614	PROTOTYPE: ;$
		1615	CODE:
		1616	RETVAL = next_pri - PRI_BIAS;
		1617	if (items > 0)
		1618	{
		1619	if (pri < PRI_MIN) pri = PRI_MIN;
		1620	if (pri > PRI_MAX) pri = PRI_MAX;
		1621	next_pri = pri + PRI_BIAS;
		1622	}
		1623	OUTPUT:
		1624	RETVAL
		1625
		1626	void
		1627	aioreq_nice (int nice = 0)
		1628	CODE:
		1629	nice = next_pri - nice;
		1630	if (nice < PRI_MIN) nice = PRI_MIN;
		1631	if (nice > PRI_MAX) nice = PRI_MAX;
		1632	next_pri = nice + PRI_BIAS;
1130		1633
1131	void	1634	void
1132	flush ()	1635	flush ()
1133	PROTOTYPE:	1636	PROTOTYPE:
1134	CODE:	1637	CODE:
1135	while (nreqs)	1638	while (nreqs)
1136	{	1639	{
1137	poll_wait ();	1640	poll_wait ();
1138	poll_cb ();	1641	poll_cb (0);
1139	}	1642	}
1140		1643
1141	void	1644	void
1142	poll()	1645	poll()
1143	PROTOTYPE:	1646	PROTOTYPE:
1144	CODE:	1647	CODE:
1145	if (nreqs)	1648	if (nreqs)
1146	{	1649	{
1147	poll_wait ();	1650	poll_wait ();
1148	poll_cb ();	1651	poll_cb (0);
1149	}	1652	}
1150		1653
1151	int	1654	int
1152	poll_fileno()	1655	poll_fileno()
1153	PROTOTYPE:	1656	PROTOTYPE:
…		…
1177	CODE:	1680	CODE:
1178	RETVAL = nreqs;	1681	RETVAL = nreqs;
1179	OUTPUT:	1682	OUTPUT:
1180	RETVAL	1683	RETVAL
1181		1684
1182	MODULE = IO::AIO PACKAGE = IO::AIO::CB	1685	int
1183		1686	nready()
1184	void
1185	cancel (aio_req_ornot req)
1186	PROTOTYPE:	1687	PROTOTYPE:
1187	CODE:	1688	CODE:
1188	req->cancelled = 1;	1689	RETVAL = get_nready ();
		1690	OUTPUT:
		1691	RETVAL
1189		1692
		1693	int
		1694	npending()
		1695	PROTOTYPE:
		1696	CODE:
		1697	RETVAL = get_npending ();
		1698	OUTPUT:
		1699	RETVAL
		1700
		1701	int
		1702	nthreads()
		1703	PROTOTYPE:
		1704	CODE:
		1705	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1706	RETVAL = started;
		1707	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1708	OUTPUT:
		1709	RETVAL
		1710
		1711	PROTOTYPES: DISABLE
		1712
		1713	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1714
		1715	void
		1716	cancel (aio_req_ornot req)
		1717	CODE:
		1718	req_cancel (req);
		1719
		1720	void
		1721	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1722	CODE:
		1723	SvREFCNT_dec (req->callback);
		1724	req->callback = newSVsv (callback);
		1725
		1726	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1727
		1728	void
		1729	add (aio_req grp, ...)
		1730	PPCODE:
		1731	{
		1732	int i;
		1733	aio_req req;
		1734
		1735	if (grp->int1 == 2)
		1736	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1737
		1738	for (i = 1; i < items; ++i )
		1739	{
		1740	if (GIMME_V != G_VOID)
		1741	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1742
		1743	req = SvAIO_REQ (ST (i));
		1744
		1745	if (req)
		1746	{
		1747	++grp->size;
		1748	req->grp = grp;
		1749
		1750	req->grp_prev = 0;
		1751	req->grp_next = grp->grp_first;
		1752
		1753	if (grp->grp_first)
		1754	grp->grp_first->grp_prev = req;
		1755
		1756	grp->grp_first = req;
		1757	}
		1758	}
		1759	}
		1760
		1761	void
		1762	cancel_subs (aio_req_ornot req)
		1763	CODE:
		1764	req_cancel_subs (req);
		1765
		1766	void
		1767	result (aio_req grp, ...)
		1768	CODE:
		1769	{
		1770	int i;
		1771	AV *av;
		1772
		1773	grp->errorno = errno;
		1774
		1775	av = newAV ();
		1776
		1777	for (i = 1; i < items; ++i )
		1778	av_push (av, newSVsv (ST (i)));
		1779
		1780	SvREFCNT_dec (grp->sv1);
		1781	grp->sv1 = (SV *)av;
		1782	}
		1783
		1784	void
		1785	errno (aio_req grp, int errorno = errno)
		1786	CODE:
		1787	grp->errorno = errorno;
		1788
		1789	void
		1790	limit (aio_req grp, int limit)
		1791	CODE:
		1792	grp->int2 = limit;
		1793	aio_grp_feed (grp);
		1794
		1795	void
		1796	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1797	CODE:
		1798	{
		1799	SvREFCNT_dec (grp->sv2);
		1800	grp->sv2 = newSVsv (callback);
		1801
		1802	if (grp->int2 <= 0)
		1803	grp->int2 = 2;
		1804
		1805	aio_grp_feed (grp);
		1806	}
		1807

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