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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.16 by root, Sun Jul 31 18:20:07 2005 UTC vs.
Revision 1.102 by root, Sun Jun 3 09:44:17 2007 UTC

		1	#include "xthread.h"
		2
		3	#include <errno.h>
		4
1	#include "EXTERN.h"	5	#include "EXTERN.h"
2	#include "perl.h"	6	#include "perl.h"
3	#include "XSUB.h"	7	#include "XSUB.h"
4		8
5	#include "autoconf/config.h"	9	#include "autoconf/config.h"
6		10
		11	#include <stddef.h>
		12	#include <stdlib.h>
		13	#include <errno.h>
		14	#include <sys/time.h>
		15	#include <sys/select.h>
7	#include <sys/types.h>	16	#include <sys/types.h>
8	#include <sys/stat.h>	17	#include <sys/stat.h>
9		18	#include <limits.h>
10	#include <unistd.h>	19	#include <unistd.h>
11	#include <fcntl.h>	20	#include <fcntl.h>
12	#include <signal.h>	21	#include <signal.h>
13	#include <sched.h>	22	#include <sched.h>
14
15	#include <pthread.h>	23	#include <utime.h>
16		24
17	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	25	#if HAVE_SENDFILE
18	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	26	# if __linux
19	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	27	# include <sys/sendfile.h>
		28	# elif __freebsd
		29	# include <sys/socket.h>
		30	# include <sys/uio.h>
		31	# elif __hpux
		32	# include <sys/socket.h>
		33	# elif __solaris /* not yet */
		34	# include <sys/sendfile.h>
		35	# else
		36	# error sendfile support requested but not available
		37	# endif
		38	#endif
20		39
21	#if __ia64	40	/* number of seconds after which idle threads exit */
		41	#define IDLE_TIMEOUT 10
		42
		43	/* used for struct dirent, AIX doesn't provide it */
		44	#ifndef NAME_MAX
		45	# define NAME_MAX 4096
		46	#endif
		47
		48	/* buffer size for various temporary buffers */
22	# define STACKSIZE 65536	49	#define AIO_BUFSIZE 65536
		50
		51	/* use NV for 32 bit perls as it allows larger offsets */
		52	#if IVSIZE >= 8
		53	# define SvVAL64 SvIV
23	#else	54	#else
24	# define STACKSIZE 4096	55	# define SvVAL64 SvNV
25	#endif	56	#endif
		57
		58	#define dBUF \
		59	char *aio_buf; \
		60	LOCK (wrklock); \
		61	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		62	UNLOCK (wrklock); \
		63	if (!aio_buf) \
		64	return -1;
		65
		66	typedef SV SV8; /* byte-sv, used for argument-checking */
26		67
27	enum {	68	enum {
28	REQ_QUIT,	69	REQ_QUIT,
29	REQ_OPEN, REQ_CLOSE,	70	REQ_OPEN, REQ_CLOSE,
30	REQ_READ, REQ_WRITE, REQ_READAHEAD,	71	REQ_READ, REQ_WRITE,
		72	REQ_READAHEAD, REQ_SENDFILE,
31	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	73	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
		74	REQ_UTIME, REQ_FUTIME,
		75	REQ_CHMOD, REQ_FCHMOD,
		76	REQ_CHOWN, REQ_FCHOWN,
32	REQ_FSYNC, REQ_FDATASYNC,	77	REQ_FSYNC, REQ_FDATASYNC,
		78	REQ_UNLINK, REQ_RMDIR, REQ_MKDIR, REQ_RENAME,
		79	REQ_MKNOD, REQ_READDIR,
		80	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		81	REQ_GROUP, REQ_NOP,
		82	REQ_BUSY,
33	};	83	};
34		84
		85	#define AIO_REQ_KLASS "IO::AIO::REQ"
		86	#define AIO_GRP_KLASS "IO::AIO::GRP"
		87
35	typedef struct aio_cb {	88	typedef struct aio_cb
		89	{
36	struct aio_cb *volatile next;	90	struct aio_cb *volatile next;
37		91
		92	SV *callback;
		93	SV *sv1, *sv2;
		94	void *ptr1, *ptr2;
		95	off_t offs;
		96	size_t size;
		97	ssize_t result;
		98	double nv1, nv2;
		99
		100	STRLEN stroffset;
38	int type;	101	int type;
39		102	int int1, int2, int3;
40	int fd;	103	int errorno;
41	off_t offset;
42	size_t length;
43	ssize_t result;
44	mode_t mode; /* open */	104	mode_t mode; /* open */
45	int errorno;
46	SV *data, *callback, *fh;
47	void *dataptr;
48	STRLEN dataoffset;
49		105
50	Stat_t *statdata;	106	unsigned char flags;
		107	unsigned char pri;
		108
		109	SV *self; /* the perl counterpart of this request, if any */
		110	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
51	} aio_cb;	111	} aio_cb;
52		112
		113	enum {
		114	FLAG_CANCELLED = 0x01, /* request was cancelled */
		115	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
		116	FLAG_PTR2_FREE = 0x80, /* need to free(ptr2) */
		117	};
		118
53	typedef aio_cb *aio_req;	119	typedef aio_cb *aio_req;
		120	typedef aio_cb *aio_req_ornot;
54		121
55	static int started;	122	enum {
56	static volatile int nreqs;	123	PRI_MIN = -4,
57	static int max_outstanding = 1<<30;	124	PRI_MAX = 4,
		125
		126	DEFAULT_PRI = 0,
		127	PRI_BIAS = -PRI_MIN,
		128	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		129	};
		130
		131	#define AIO_TICKS ((1000000 + 1023) >> 10)
		132
		133	static unsigned int max_poll_time = 0;
		134	static unsigned int max_poll_reqs = 0;
		135
		136	/* calculcate time difference in ~1/AIO_TICKS of a second */
		137	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		138	{
		139	return (tv2->tv_sec - tv1->tv_sec ) * AIO_TICKS
		140	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		141	}
		142
		143	static thread_t main_tid;
		144	static int main_sig;
		145	static int block_sig_level;
		146
		147	void block_sig ()
		148	{
		149	sigset_t ss;
		150
		151	if (block_sig_level++)
		152	return;
		153
		154	if (!main_sig)
		155	return;
		156
		157	sigemptyset (&ss);
		158	sigaddset (&ss, main_sig);
		159	pthread_sigmask (SIG_BLOCK, &ss, 0);
		160	}
		161
		162	void unblock_sig ()
		163	{
		164	sigset_t ss;
		165
		166	if (--block_sig_level)
		167	return;
		168
		169	if (!main_sig)
		170	return;
		171
		172	sigemptyset (&ss);
		173	sigaddset (&ss, main_sig);
		174	pthread_sigmask (SIG_UNBLOCK, &ss, 0);
		175	}
		176
		177	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		178
		179	static unsigned int started, idle, wanted;
		180
		181	/* worker threads management */
		182	static mutex_t wrklock = MUTEX_INIT;
		183
		184	typedef struct worker {
		185	/* locked by wrklock */
		186	struct worker *prev, *next;
		187
		188	thread_t tid;
		189
		190	/* locked by reslock, reqlock or wrklock */
		191	aio_req req; /* currently processed request */
		192	void *dbuf;
		193	DIR *dirp;
		194	} worker;
		195
		196	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		197
		198	static void worker_clear (worker *wrk)
		199	{
		200	if (wrk->dirp)
		201	{
		202	closedir (wrk->dirp);
		203	wrk->dirp = 0;
		204	}
		205
		206	if (wrk->dbuf)
		207	{
		208	free (wrk->dbuf);
		209	wrk->dbuf = 0;
		210	}
		211	}
		212
		213	static void worker_free (worker *wrk)
		214	{
		215	wrk->next->prev = wrk->prev;
		216	wrk->prev->next = wrk->next;
		217
		218	free (wrk);
		219	}
		220
		221	static volatile unsigned int nreqs, nready, npending;
		222	static volatile unsigned int max_idle = 4;
		223	static volatile unsigned int max_outstanding = 0xffffffff;
58	static int respipe [2];	224	static int respipe [2];
59		225
60	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	226	static mutex_t reslock = MUTEX_INIT;
61	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	227	static mutex_t reqlock = MUTEX_INIT;
62	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	228	static cond_t reqwait = COND_INIT;
63		229
64	static volatile aio_req reqs, reqe; /* queue start, queue end */	230	#if WORDACCESS_UNSAFE
65	static volatile aio_req ress, rese; /* queue start, queue end */
66		231
67	static void	232	static unsigned int get_nready ()
68	poll_wait ()
69	{	233	{
70	if (nreqs && !ress)	234	unsigned int retval;
		235
		236	LOCK (reqlock);
		237	retval = nready;
		238	UNLOCK (reqlock);
		239
		240	return retval;
		241	}
		242
		243	static unsigned int get_npending ()
		244	{
		245	unsigned int retval;
		246
		247	LOCK (reslock);
		248	retval = npending;
		249	UNLOCK (reslock);
		250
		251	return retval;
		252	}
		253
		254	static unsigned int get_nthreads ()
		255	{
		256	unsigned int retval;
		257
		258	LOCK (wrklock);
		259	retval = started;
		260	UNLOCK (wrklock);
		261
		262	return retval;
		263	}
		264
		265	#else
		266
		267	# define get_nready() nready
		268	# define get_npending() npending
		269	# define get_nthreads() started
		270
		271	#endif
		272
		273	/*
		274	* a somewhat faster data structure might be nice, but
		275	* with 8 priorities this actually needs <20 insns
		276	* per shift, the most expensive operation.
		277	*/
		278	typedef struct {
		279	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		280	int size;
		281	} reqq;
		282
		283	static reqq req_queue;
		284	static reqq res_queue;
		285
		286	int reqq_push (reqq *q, aio_req req)
		287	{
		288	int pri = req->pri;
		289	req->next = 0;
		290
		291	if (q->qe[pri])
71	{	292	{
72	fd_set rfd;	293	q->qe[pri]->next = req;
73	FD_ZERO(&rfd);	294	q->qe[pri] = req;
74	FD_SET(respipe [0], &rfd);
75
76	select (respipe [0] + 1, &rfd, 0, 0, 0);
77	}	295	}
78	}	296	else
		297	q->qe[pri] = q->qs[pri] = req;
79		298
80	static int	299	return q->size++;
81	poll_cb ()	300	}
		301
		302	aio_req reqq_shift (reqq *q)
		303	{
		304	int pri;
		305
		306	if (!q->size)
		307	return 0;
		308
		309	--q->size;
		310
		311	for (pri = NUM_PRI; pri--; )
		312	{
		313	aio_req req = q->qs[pri];
		314
		315	if (req)
		316	{
		317	if (!(q->qs[pri] = req->next))
		318	q->qe[pri] = 0;
		319
		320	return req;
		321	}
		322	}
		323
		324	abort ();
		325	}
		326
		327	static int poll_cb ();
		328	static int req_invoke (aio_req req);
		329	static void req_destroy (aio_req req);
		330	static void req_cancel (aio_req req);
		331
		332	/* must be called at most once */
		333	static SV *req_sv (aio_req req, const char *klass)
		334	{
		335	if (!req->self)
		336	{
		337	req->self = (SV *)newHV ();
		338	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		339	}
		340
		341	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		342	}
		343
		344	static aio_req SvAIO_REQ (SV *sv)
		345	{
		346	MAGIC *mg;
		347
		348	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		349	croak ("object of class " AIO_REQ_KLASS " expected");
		350
		351	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		352
		353	return mg ? (aio_req)mg->mg_ptr : 0;
		354	}
		355
		356	static void aio_grp_feed (aio_req grp)
		357	{
		358	block_sig ();
		359
		360	while (grp->size < grp->int2 && !(grp->flags & FLAG_CANCELLED))
		361	{
		362	int old_len = grp->size;
		363
		364	if (grp->sv2 && SvOK (grp->sv2))
		365	{
		366	dSP;
		367
		368	ENTER;
		369	SAVETMPS;
		370	PUSHMARK (SP);
		371	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		372	PUTBACK;
		373	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		374	SPAGAIN;
		375	FREETMPS;
		376	LEAVE;
		377	}
		378
		379	/* stop if no progress has been made */
		380	if (old_len == grp->size)
		381	{
		382	SvREFCNT_dec (grp->sv2);
		383	grp->sv2 = 0;
		384	break;
		385	}
		386	}
		387
		388	unblock_sig ();
		389	}
		390
		391	static void aio_grp_dec (aio_req grp)
		392	{
		393	--grp->size;
		394
		395	/* call feeder, if applicable */
		396	aio_grp_feed (grp);
		397
		398	/* finish, if done */
		399	if (!grp->size && grp->int1)
		400	{
		401	block_sig ();
		402
		403	if (!req_invoke (grp))
		404	{
		405	req_destroy (grp);
		406	unblock_sig ();
		407	croak (0);
		408	}
		409
		410	req_destroy (grp);
		411	unblock_sig ();
		412	}
		413	}
		414
		415	static int req_invoke (aio_req req)
82	{	416	{
83	dSP;	417	dSP;
84	int count = 0;
85	aio_req req, prv;
86		418
87	pthread_mutex_lock (&reslock);	419	if (req->flags & FLAG_SV2_RO_OFF)
		420	SvREADONLY_off (req->sv2);
88		421
89	{	422	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
90	/* read any signals sent by the worker threads */
91	char buf [32];
92	while (read (respipe [0], buf, 32) > 0)
93	;
94	}
95
96	req = ress;
97	ress = rese = 0;
98
99	pthread_mutex_unlock (&reslock);
100
101	while (req)
102	{	423	{
103	nreqs--;	424	ENTER;
		425	SAVETMPS;
		426	PUSHMARK (SP);
		427	EXTEND (SP, 1);
104		428
105	if (req->type == REQ_QUIT)	429	switch (req->type)
106	started--;
107	else
108	{	430	{
109	int errorno = errno;	431	case REQ_READDIR:
110	errno = req->errorno;
111
112	if (req->type == REQ_READ)
113	SvCUR_set (req->data, req->dataoffset
114	+ req->result > 0 ? req->result : 0);
115
116	if (req->data)
117	SvREFCNT_dec (req->data);
118
119	if (req->fh)
120	SvREFCNT_dec (req->fh);
121
122	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
123	{	432	{
124	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	433	SV *rv = &PL_sv_undef;
125	PL_laststatval = req->result;
126	PL_statcache = *(req->statdata);
127		434
128	Safefree (req->statdata);	435	if (req->result >= 0)
		436	{
		437	int i;
		438	char *buf = req->ptr2;
		439	AV *av = newAV ();
		440
		441	av_extend (av, req->result - 1);
		442
		443	for (i = 0; i < req->result; ++i)
		444	{
		445	SV *sv = newSVpv (buf, 0);
		446
		447	av_store (av, i, sv);
		448	buf += SvCUR (sv) + 1;
		449	}
		450
		451	rv = sv_2mortal (newRV_noinc ((SV *)av));
		452	}
		453
		454	PUSHs (rv);
129	}	455	}
		456	break;
130		457
131	ENTER;	458	case REQ_OPEN:
132	PUSHMARK (SP);
133	XPUSHs (sv_2mortal (newSViv (req->result)));
134
135	if (req->type == REQ_OPEN)
136	{	459	{
137	/* convert fd to fh */	460	/* convert fd to fh */
138	SV *fh;	461	SV *fh;
139		462
		463	PUSHs (sv_2mortal (newSViv (req->result)));
140	PUTBACK;	464	PUTBACK;
141	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	465	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
142	SPAGAIN;	466	SPAGAIN;
143		467
144	fh = SvREFCNT_inc (POPs);	468	fh = POPs;
145
146	PUSHMARK (SP);	469	PUSHMARK (SP);
147	XPUSHs (sv_2mortal (fh));	470	XPUSHs (fh);
148	}	471	}
		472	break;
149		473
150	if (SvOK (req->callback))	474	case REQ_GROUP:
		475	req->int1 = 2; /* mark group as finished */
		476
		477	if (req->sv1)
151	{	478	{
152	PUTBACK;	479	int i;
153	call_sv (req->callback, G_VOID | G_EVAL);	480	AV *av = (AV *)req->sv1;
154	SPAGAIN;	481
		482	EXTEND (SP, AvFILL (av) + 1);
		483	for (i = 0; i <= AvFILL (av); ++i)
		484	PUSHs (*av_fetch (av, i, 0));
155	}	485	}
		486	break;
156		487
157	LEAVE;	488	case REQ_NOP:
		489	case REQ_BUSY:
		490	break;
		491
		492	case REQ_READLINK:
		493	if (req->result > 0)
158		494	{
159	if (req->callback)	495	SvCUR_set (req->sv2, req->result);
160	SvREFCNT_dec (req->callback);	496	*SvEND (req->sv2) = 0;
		497	PUSHs (req->sv2);
		498	}
		499	break;
161		500
162	errno = errorno;	501	case REQ_STAT:
163	count++;	502	case REQ_LSTAT:
		503	case REQ_FSTAT:
		504	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		505	PL_laststatval = req->result;
		506	PL_statcache = *(Stat_t *)(req->ptr2);
		507	PUSHs (sv_2mortal (newSViv (req->result)));
		508	break;
		509
		510	case REQ_READ:
		511	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		512	*SvEND (req->sv2) = 0;
		513	PUSHs (sv_2mortal (newSViv (req->result)));
		514	break;
		515
		516	default:
		517	PUSHs (sv_2mortal (newSViv (req->result)));
		518	break;
164	}	519	}
165		520
166	prv = req;	521	errno = req->errorno;
167	req = req->next;
168	Safefree (prv);
169		522
170	/* TODO: croak on errors? */	523	PUTBACK;
		524	call_sv (req->callback, G_VOID | G_EVAL);
		525	SPAGAIN;
		526
		527	FREETMPS;
		528	LEAVE;
171	}	529	}
172		530
173	return count;
174	}
175
176	static void *aio_proc(void *arg);
177
178	static void
179	start_thread (void)
180	{
181	sigset_t fullsigset, oldsigset;
182	pthread_t tid;
183	pthread_attr_t attr;
184
185	pthread_attr_init (&attr);
186	pthread_attr_setstacksize (&attr, STACKSIZE);
187	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
188
189	sigfillset (&fullsigset);
190	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
191
192	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
193	started++;
194
195	sigprocmask (SIG_SETMASK, &oldsigset, 0);
196	}
197
198	static void
199	send_req (aio_req req)
200	{
201	nreqs++;
202
203	pthread_mutex_lock (&reqlock);
204
205	req->next = 0;
206
207	if (reqe)	531	if (req->grp)
208	{	532	{
209	reqe->next = req;	533	aio_req grp = req->grp;
210	reqe = req;	534
		535	/* unlink request */
		536	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		537	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		538
		539	if (grp->grp_first == req)
		540	grp->grp_first = req->grp_next;
		541
		542	aio_grp_dec (grp);
		543	}
		544
		545	return !SvTRUE (ERRSV);
		546	}
		547
		548	static void req_destroy (aio_req req)
		549	{
		550	if (req->self)
		551	{
		552	sv_unmagic (req->self, PERL_MAGIC_ext);
		553	SvREFCNT_dec (req->self);
		554	}
		555
		556	SvREFCNT_dec (req->sv1);
		557	SvREFCNT_dec (req->sv2);
		558	SvREFCNT_dec (req->callback);
		559
		560	if (req->flags & FLAG_PTR2_FREE)
		561	free (req->ptr2);
		562
		563	Safefree (req);
		564	}
		565
		566	static void req_cancel_subs (aio_req grp)
		567	{
		568	aio_req sub;
		569
		570	if (grp->type != REQ_GROUP)
		571	return;
		572
		573	SvREFCNT_dec (grp->sv2);
		574	grp->sv2 = 0;
		575
		576	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		577	req_cancel (sub);
		578	}
		579
		580	static void req_cancel (aio_req req)
		581	{
		582	req->flags |= FLAG_CANCELLED;
		583
		584	req_cancel_subs (req);
		585	}
		586
		587	static void *aio_proc (void *arg);
		588
		589	static void start_thread (void)
		590	{
		591	worker *wrk = calloc (1, sizeof (worker));
		592
		593	if (!wrk)
		594	croak ("unable to allocate worker thread data");
		595
		596	LOCK (wrklock);
		597
		598	if (thread_create (&wrk->tid, aio_proc, (void *)wrk))
		599	{
		600	wrk->prev = &wrk_first;
		601	wrk->next = wrk_first.next;
		602	wrk_first.next->prev = wrk;
		603	wrk_first.next = wrk;
		604	++started;
211	}	605	}
212	else	606	else
213	reqe = reqs = req;	607	free (wrk);
214		608
215	pthread_cond_signal (&reqwait);	609	UNLOCK (wrklock);
216	pthread_mutex_unlock (&reqlock);	610	}
217		611
218	while (nreqs > max_outstanding)	612	static void maybe_start_thread ()
		613	{
		614	if (get_nthreads () >= wanted)
		615	return;
		616
		617	/* todo: maybe use idle here, but might be less exact */
		618	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		619	return;
		620
		621	start_thread ();
		622	}
		623
		624	static void req_send (aio_req req)
		625	{
		626	block_sig ();
		627
		628	++nreqs;
		629
		630	LOCK (reqlock);
		631	++nready;
		632	reqq_push (&req_queue, req);
		633	COND_SIGNAL (reqwait);
		634	UNLOCK (reqlock);
		635
		636	unblock_sig ();
		637
		638	maybe_start_thread ();
		639	}
		640
		641	static void end_thread (void)
		642	{
		643	aio_req req;
		644
		645	Newz (0, req, 1, aio_cb);
		646
		647	req->type = REQ_QUIT;
		648	req->pri = PRI_MAX + PRI_BIAS;
		649
		650	LOCK (reqlock);
		651	reqq_push (&req_queue, req);
		652	COND_SIGNAL (reqwait);
		653	UNLOCK (reqlock);
		654
		655	LOCK (wrklock);
		656	--started;
		657	UNLOCK (wrklock);
		658	}
		659
		660	static void set_max_idle (int nthreads)
		661	{
		662	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		663	max_idle = nthreads <= 0 ? 1 : nthreads;
		664	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
		665	}
		666
		667	static void min_parallel (int nthreads)
		668	{
		669	if (wanted < nthreads)
		670	wanted = nthreads;
		671	}
		672
		673	static void max_parallel (int nthreads)
		674	{
		675	if (wanted > nthreads)
		676	wanted = nthreads;
		677
		678	while (started > wanted)
		679	end_thread ();
		680	}
		681
		682	static void poll_wait ()
		683	{
		684	fd_set rfd;
		685
		686	while (nreqs)
219	{	687	{
220	poll_wait ();	688	int size;
221	poll_cb ();	689	if (WORDACCESS_UNSAFE) LOCK (reslock);
		690	size = res_queue.size;
		691	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		692
		693	if (size)
		694	return;
		695
		696	maybe_start_thread ();
		697
		698	FD_ZERO(&rfd);
		699	FD_SET(respipe [0], &rfd);
		700
		701	select (respipe [0] + 1, &rfd, 0, 0, 0);
222	}	702	}
223	}	703	}
224		704
225	static void	705	static int poll_cb ()
226	end_thread (void)
227	{	706	{
		707	dSP;
		708	int count = 0;
		709	int maxreqs = max_poll_reqs;
		710	int do_croak = 0;
		711	struct timeval tv_start, tv_now;
228	aio_req req;	712	aio_req req;
229	New (0, req, 1, aio_cb);
230	req->type = REQ_QUIT;
231		713
232	send_req (req);	714	if (max_poll_time)
233	}	715	gettimeofday (&tv_start, 0);
234		716
235	static void *	717	block_sig ();
236	aio_proc (void *thr_arg)
237	{
238	aio_req req;
239	int type;
240		718
241	do	719	for (;;)
242	{	720	{
243	pthread_mutex_lock (&reqlock);
244
245	for (;;)	721	for (;;)
246	{	722	{
247	req = reqs;	723	maybe_start_thread ();
248		724
		725	LOCK (reslock);
		726	req = reqq_shift (&res_queue);
		727
249	if (reqs)	728	if (req)
250	{	729	{
251	reqs = reqs->next;	730	--npending;
252	if (!reqs) reqe = 0;	731
		732	if (!res_queue.size)
		733	{
		734	/* read any signals sent by the worker threads */
		735	char buf [4];
		736	while (read (respipe [0], buf, 4) == 4)
		737	;
		738	}
253	}	739	}
		740
		741	UNLOCK (reslock);
		742
		743	if (!req)
		744	break;
		745
		746	--nreqs;
		747
		748	if (req->type == REQ_GROUP && req->size)
		749	{
		750	req->int1 = 1; /* mark request as delayed */
		751	continue;
		752	}
		753	else
		754	{
		755	if (!req_invoke (req))
		756	{
		757	req_destroy (req);
		758	unblock_sig ();
		759	croak (0);
		760	}
		761
		762	count++;
		763	}
		764
		765	req_destroy (req);
		766
		767	if (maxreqs && !--maxreqs)
		768	break;
		769
		770	if (max_poll_time)
		771	{
		772	gettimeofday (&tv_now, 0);
		773
		774	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
		775	break;
		776	}
		777	}
		778
		779	if (nreqs <= max_outstanding)
		780	break;
		781
		782	poll_wait ();
		783
		784	++maxreqs;
		785	}
		786
		787	unblock_sig ();
		788	return count;
		789	}
		790
		791	static void create_pipe ()
		792	{
		793	if (pipe (respipe))
		794	croak ("unable to initialize result pipe");
		795
		796	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
		797	croak ("cannot set result pipe to nonblocking mode");
		798
		799	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		800	croak ("cannot set result pipe to nonblocking mode");
		801	}
		802
		803	/*****************************************************************************/
		804	/* work around various missing functions */
		805
		806	#if !HAVE_PREADWRITE
		807	# define pread aio_pread
		808	# define pwrite aio_pwrite
		809
		810	/*
		811	* make our pread/pwrite safe against themselves, but not against
		812	* normal read/write by using a mutex. slows down execution a lot,
		813	* but that's your problem, not mine.
		814	*/
		815	static mutex_t preadwritelock = MUTEX_INIT;
		816
		817	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		818	{
		819	ssize_t res;
		820	off_t ooffset;
		821
		822	LOCK (preadwritelock);
		823	ooffset = lseek (fd, 0, SEEK_CUR);
		824	lseek (fd, offset, SEEK_SET);
		825	res = read (fd, buf, count);
		826	lseek (fd, ooffset, SEEK_SET);
		827	UNLOCK (preadwritelock);
		828
		829	return res;
		830	}
		831
		832	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		833	{
		834	ssize_t res;
		835	off_t ooffset;
		836
		837	LOCK (preadwritelock);
		838	ooffset = lseek (fd, 0, SEEK_CUR);
		839	lseek (fd, offset, SEEK_SET);
		840	res = write (fd, buf, count);
		841	lseek (fd, offset, SEEK_SET);
		842	UNLOCK (preadwritelock);
		843
		844	return res;
		845	}
		846	#endif
		847
		848	#ifndef HAVE_FUTIMES
		849
		850	# define utimes(path,times) aio_utimes (path, times)
		851	# define futimes(fd,times) aio_futimes (fd, times)
		852
		853	int aio_utimes (const char *filename, const struct timeval times[2])
		854	{
		855	if (times)
		856	{
		857	struct utimbuf buf;
		858
		859	buf.actime = times[0].tv_sec;
		860	buf.modtime = times[1].tv_sec;
		861
		862	return utime (filename, &buf);
		863	}
		864	else
		865	return utime (filename, 0);
		866	}
		867
		868	int aio_futimes (int fd, const struct timeval tv[2])
		869	{
		870	errno = ENOSYS;
		871	return -1;
		872	}
		873
		874	#endif
		875
		876	#if !HAVE_FDATASYNC
		877	# define fdatasync fsync
		878	#endif
		879
		880	#if !HAVE_READAHEAD
		881	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
		882
		883	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
		884	{
		885	dBUF;
		886
		887	while (count > 0)
		888	{
		889	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
		890
		891	pread (fd, aio_buf, len, offset);
		892	offset += len;
		893	count -= len;
		894	}
		895
		896	errno = 0;
		897	}
		898
		899	#endif
		900
		901	#if !HAVE_READDIR_R
		902	# define readdir_r aio_readdir_r
		903
		904	static mutex_t readdirlock = MUTEX_INIT;
		905
		906	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		907	{
		908	struct dirent *e;
		909	int errorno;
		910
		911	LOCK (readdirlock);
		912
		913	e = readdir (dirp);
		914	errorno = errno;
		915
		916	if (e)
		917	{
		918	*res = ent;
		919	strcpy (ent->d_name, e->d_name);
		920	}
		921	else
		922	*res = 0;
		923
		924	UNLOCK (readdirlock);
		925
		926	errno = errorno;
		927	return e ? 0 : -1;
		928	}
		929	#endif
		930
		931	/* sendfile always needs emulation */
		932	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
		933	{
		934	ssize_t res;
		935
		936	if (!count)
		937	return 0;
		938
		939	#if HAVE_SENDFILE
		940	# if __linux
		941	res = sendfile (ofd, ifd, &offset, count);
		942
		943	# elif __freebsd
		944	/*
		945	* Of course, the freebsd sendfile is a dire hack with no thoughts
		946	* wasted on making it similar to other I/O functions.
		947	*/
		948	{
		949	off_t sbytes;
		950	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		951
		952	if (res < 0 && sbytes)
		953	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
		954	res = sbytes;
		955	}
		956
		957	# elif __hpux
		958	res = sendfile (ofd, ifd, offset, count, 0, 0);
		959
		960	# elif __solaris
		961	{
		962	struct sendfilevec vec;
		963	size_t sbytes;
		964
		965	vec.sfv_fd = ifd;
		966	vec.sfv_flag = 0;
		967	vec.sfv_off = offset;
		968	vec.sfv_len = count;
		969
		970	res = sendfilev (ofd, &vec, 1, &sbytes);
		971
		972	if (res < 0 && sbytes)
		973	res = sbytes;
		974	}
		975
		976	# endif
		977	#else
		978	res = -1;
		979	errno = ENOSYS;
		980	#endif
		981
		982	if (res < 0
		983	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		984	#if __solaris
		985	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		986	#endif
		987	)
		988	)
		989	{
		990	/* emulate sendfile. this is a major pain in the ass */
		991	dBUF;
		992
		993	res = 0;
		994
		995	while (count)
		996	{
		997	ssize_t cnt;
		998
		999	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
		1000
		1001	if (cnt <= 0)
		1002	{
		1003	if (cnt && !res) res = -1;
		1004	break;
		1005	}
		1006
		1007	cnt = write (ofd, aio_buf, cnt);
		1008
		1009	if (cnt <= 0)
		1010	{
		1011	if (cnt && !res) res = -1;
		1012	break;
		1013	}
		1014
		1015	offset += cnt;
		1016	res += cnt;
		1017	count -= cnt;
		1018	}
		1019	}
		1020
		1021	return res;
		1022	}
		1023
		1024	/* read a full directory */
		1025	static void scandir_ (aio_req req, worker *self)
		1026	{
		1027	DIR *dirp;
		1028	union
		1029	{
		1030	struct dirent d;
		1031	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		1032	} *u;
		1033	struct dirent *entp;
		1034	char *name, *names;
		1035	int memlen = 4096;
		1036	int memofs = 0;
		1037	int res = 0;
		1038	int errorno;
		1039
		1040	LOCK (wrklock);
		1041	self->dirp = dirp = opendir (req->ptr1);
		1042	self->dbuf = u = malloc (sizeof (*u));
		1043	req->flags |= FLAG_PTR2_FREE;
		1044	req->ptr2 = names = malloc (memlen);
		1045	UNLOCK (wrklock);
		1046
		1047	if (dirp && u && names)
		1048	for (;;)
		1049	{
		1050	errno = 0;
		1051	readdir_r (dirp, &u->d, &entp);
		1052
		1053	if (!entp)
		1054	break;
		1055
		1056	name = entp->d_name;
		1057
		1058	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1059	{
		1060	int len = strlen (name) + 1;
		1061
		1062	res++;
		1063
		1064	while (memofs + len > memlen)
		1065	{
		1066	memlen *= 2;
		1067	LOCK (wrklock);
		1068	req->ptr2 = names = realloc (names, memlen);
		1069	UNLOCK (wrklock);
		1070
		1071	if (!names)
		1072	break;
		1073	}
		1074
		1075	memcpy (names + memofs, name, len);
		1076	memofs += len;
		1077	}
		1078	}
		1079
		1080	if (errno)
		1081	res = -1;
		1082
		1083	req->result = res;
		1084	}
		1085
		1086	/*****************************************************************************/
		1087
		1088	static void *aio_proc (void *thr_arg)
		1089	{
		1090	aio_req req;
		1091	struct timespec ts;
		1092	worker *self = (worker *)thr_arg;
		1093
		1094	/* try to distribute timeouts somewhat evenly */
		1095	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1096	* (1000000000UL / 1024UL);
		1097
		1098	for (;;)
		1099	{
		1100	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1101
		1102	LOCK (reqlock);
		1103
		1104	for (;;)
		1105	{
		1106	self->req = req = reqq_shift (&req_queue);
254		1107
255	if (req)	1108	if (req)
256	break;	1109	break;
257		1110
258	pthread_cond_wait (&reqwait, &reqlock);	1111	++idle;
		1112
		1113	if (COND_TIMEDWAIT (reqwait, reqlock, ts)
		1114	== ETIMEDOUT)
		1115	{
		1116	if (idle > max_idle)
		1117	{
		1118	--idle;
		1119	UNLOCK (reqlock);
		1120	LOCK (wrklock);
		1121	--started;
		1122	UNLOCK (wrklock);
		1123	goto quit;
		1124	}
		1125
		1126	/* we are allowed to idle, so do so without any timeout */
		1127	COND_WAIT (reqwait, reqlock);
		1128	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1129	}
		1130
		1131	--idle;
259	}	1132	}
260		1133
261	pthread_mutex_unlock (&reqlock);	1134	--nready;
		1135
		1136	UNLOCK (reqlock);
262		1137
263	errno = 0; /* strictly unnecessary */	1138	errno = 0; /* strictly unnecessary */
264		1139
265	type = req->type;	1140	if (!(req->flags & FLAG_CANCELLED))
266
267	switch (type)	1141	switch (req->type)
		1142	{
		1143	case REQ_READ: req->result = req->offs >= 0
		1144	? pread (req->int1, req->ptr1, req->size, req->offs)
		1145	: read (req->int1, req->ptr1, req->size); break;
		1146	case REQ_WRITE: req->result = req->offs >= 0
		1147	? pwrite (req->int1, req->ptr1, req->size, req->offs)
		1148	: write (req->int1, req->ptr1, req->size); break;
		1149
		1150	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
		1151	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
		1152
		1153	case REQ_STAT: req->result = stat (req->ptr1, (Stat_t *)req->ptr2); break;
		1154	case REQ_LSTAT: req->result = lstat (req->ptr1, (Stat_t *)req->ptr2); break;
		1155	case REQ_FSTAT: req->result = fstat (req->int1, (Stat_t *)req->ptr2); break;
		1156
		1157	case REQ_CHOWN: req->result = chown (req->ptr1, req->int2, req->int3); break;
		1158	case REQ_FCHOWN: req->result = fchown (req->int1, req->int2, req->int3); break;
		1159	case REQ_CHMOD: req->result = chmod (req->ptr1, req->mode); break;
		1160	case REQ_FCHMOD: req->result = fchmod (req->int1, req->mode); break;
		1161
		1162	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
		1163	case REQ_CLOSE: req->result = close (req->int1); break;
		1164	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
		1165	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
		1166	case REQ_MKDIR: req->result = mkdir (req->ptr1, req->mode); break;
		1167	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
		1168	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
		1169	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1170	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1171	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
		1172
		1173	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
		1174	case REQ_FSYNC: req->result = fsync (req->int1); break;
		1175	case REQ_READDIR: scandir_ (req, self); break;
		1176
		1177	case REQ_BUSY:
		1178	{
		1179	struct timeval tv;
		1180
		1181	tv.tv_sec = req->nv1;
		1182	tv.tv_usec = (req->nv1 - tv.tv_usec) * 1000000.;
		1183
		1184	req->result = select (0, 0, 0, 0, &tv);
		1185	}
		1186
		1187	case REQ_UTIME:
		1188	case REQ_FUTIME:
		1189	{
		1190	struct timeval tv[2];
		1191	struct timeval *times;
		1192
		1193	if (req->nv1 != -1. || req->nv2 != -1.)
		1194	{
		1195	tv[0].tv_sec = req->nv1;
		1196	tv[0].tv_usec = (req->nv1 - tv[0].tv_sec) * 1000000.;
		1197	tv[1].tv_sec = req->nv2;
		1198	tv[1].tv_usec = (req->nv2 - tv[1].tv_sec) * 1000000.;
		1199
		1200	times = tv;
		1201	}
		1202	else
		1203	times = 0;
		1204
		1205
		1206	req->result = req->type == REQ_FUTIME
		1207	? futimes (req->int1, times)
		1208	: utimes (req->ptr1, times);
		1209	}
		1210
		1211	case REQ_GROUP:
		1212	case REQ_NOP:
		1213	break;
		1214
		1215	case REQ_QUIT:
		1216	goto quit;
		1217
		1218	default:
		1219	req->result = -1;
		1220	break;
		1221	}
		1222
		1223	req->errorno = errno;
		1224
		1225	LOCK (reslock);
		1226
		1227	++npending;
		1228
		1229	if (!reqq_push (&res_queue, req))
268	{	1230	{
269	#if HAVE_PREADWRITE
270	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
271	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
272	#else
273	# error "pread/pwrite cannot be emulated, fix your os"
274	#endif
275
276	#if HAVE_READAHEAD
277	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
278	#else
279	// TODO: emulate
280	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
281	#endif
282
283	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
284	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
285	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
286
287	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
288	case REQ_CLOSE: req->result = close (req->fd); break;
289	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
290
291	case REQ_FDATASYNC:
292	#if HAVE_FDATASYNC
293	req->result = fdatasync (req->fd); break;
294	#endif
295	case REQ_FSYNC: req->result = fsync (req->fd); break;
296
297	case REQ_QUIT:
298	break;
299
300	default:
301	req->result = ENOSYS;
302	break;
303	}
304
305	req->errorno = errno;
306
307	pthread_mutex_lock (&reslock);
308
309	req->next = 0;
310
311	if (rese)
312	{
313	rese->next = req;
314	rese = req;
315	}
316	else
317	{
318	rese = ress = req;
319
320	/* write a dummy byte to the pipe so fh becomes ready */	1231	/* write a dummy byte to the pipe so fh becomes ready */
321	write (respipe [1], &respipe, 1);	1232	write (respipe [1], &respipe, 1);
		1233
		1234	/* optionally signal the main thread asynchronously */
		1235	if (main_sig)
		1236	pthread_kill (main_tid, main_sig);
322	}	1237	}
323		1238
324	pthread_mutex_unlock (&reslock);	1239	self->req = 0;
		1240	worker_clear (self);
		1241
		1242	UNLOCK (reslock);
325	}	1243	}
326	while (type != REQ_QUIT);	1244
		1245	quit:
		1246	LOCK (wrklock);
		1247	worker_free (self);
		1248	UNLOCK (wrklock);
327		1249
328	return 0;	1250	return 0;
329	}	1251	}
330		1252
		1253	/*****************************************************************************/
		1254
		1255	static void atfork_prepare (void)
		1256	{
		1257	LOCK (wrklock);
		1258	LOCK (reqlock);
		1259	LOCK (reslock);
		1260	#if !HAVE_PREADWRITE
		1261	LOCK (preadwritelock);
		1262	#endif
		1263	#if !HAVE_READDIR_R
		1264	LOCK (readdirlock);
		1265	#endif
		1266	}
		1267
		1268	static void atfork_parent (void)
		1269	{
		1270	#if !HAVE_READDIR_R
		1271	UNLOCK (readdirlock);
		1272	#endif
		1273	#if !HAVE_PREADWRITE
		1274	UNLOCK (preadwritelock);
		1275	#endif
		1276	UNLOCK (reslock);
		1277	UNLOCK (reqlock);
		1278	UNLOCK (wrklock);
		1279	}
		1280
		1281	static void atfork_child (void)
		1282	{
		1283	aio_req prv;
		1284
		1285	while (prv = reqq_shift (&req_queue))
		1286	req_destroy (prv);
		1287
		1288	while (prv = reqq_shift (&res_queue))
		1289	req_destroy (prv);
		1290
		1291	while (wrk_first.next != &wrk_first)
		1292	{
		1293	worker *wrk = wrk_first.next;
		1294
		1295	if (wrk->req)
		1296	req_destroy (wrk->req);
		1297
		1298	worker_clear (wrk);
		1299	worker_free (wrk);
		1300	}
		1301
		1302	started = 0;
		1303	idle = 0;
		1304	nreqs = 0;
		1305	nready = 0;
		1306	npending = 0;
		1307
		1308	close (respipe [0]);
		1309	close (respipe [1]);
		1310	create_pipe ();
		1311
		1312	atfork_parent ();
		1313	}
		1314
		1315	#define dREQ \
		1316	aio_req req; \
		1317	int req_pri = next_pri; \
		1318	next_pri = DEFAULT_PRI + PRI_BIAS; \
		1319	\
		1320	if (SvOK (callback) && !SvROK (callback)) \
		1321	croak ("callback must be undef or of reference type"); \
		1322	\
		1323	Newz (0, req, 1, aio_cb); \
		1324	if (!req) \
		1325	croak ("out of memory during aio_req allocation"); \
		1326	\
		1327	req->callback = newSVsv (callback); \
		1328	req->pri = req_pri
		1329
		1330	#define REQ_SEND \
		1331	req_send (req); \
		1332	\
		1333	if (GIMME_V != G_VOID) \
		1334	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		1335
331	MODULE = IO::AIO PACKAGE = IO::AIO	1336	MODULE = IO::AIO PACKAGE = IO::AIO
332		1337
333	PROTOTYPES: ENABLE	1338	PROTOTYPES: ENABLE
334		1339
335	BOOT:	1340	BOOT:
336	{	1341	{
337	if (pipe (respipe))	1342	HV *stash = gv_stashpv ("IO::AIO", 1);
338	croak ("unable to initialize result pipe");
339		1343
340	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	1344	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
341	croak ("cannot set result pipe to nonblocking mode");	1345	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1346	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1347	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1348	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1349	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		1350	newCONSTSUB (stash, "SIGIO", newSViv (SIGIO));
342		1351
343	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	1352	create_pipe ();
344	croak ("cannot set result pipe to nonblocking mode");	1353	ATFORK (atfork_prepare, atfork_parent, atfork_child);
345	}	1354	}
346		1355
347	void	1356	void
348	min_parallel(nthreads)	1357	max_poll_reqs (int nreqs)
349	int nthreads
350	PROTOTYPE: $	1358	PROTOTYPE: $
351	CODE:	1359	CODE:
352	while (nthreads > started)	1360	max_poll_reqs = nreqs;
353	start_thread ();
354		1361
355	void	1362	void
356	max_parallel(nthreads)	1363	max_poll_time (double nseconds)
357	int nthreads
358	PROTOTYPE: $	1364	PROTOTYPE: $
359	CODE:	1365	CODE:
360	{	1366	max_poll_time = nseconds * AIO_TICKS;
361	int cur = started;
362	while (cur > nthreads)
363	{
364	end_thread ();
365	cur--;
366	}
367		1367
368	while (started > nthreads)	1368	void
369	{	1369	min_parallel (int nthreads)
370	poll_wait ();	1370	PROTOTYPE: $
371	poll_cb ();	1371
372	}	1372	void
373	}	1373	max_parallel (int nthreads)
		1374	PROTOTYPE: $
		1375
		1376	void
		1377	max_idle (int nthreads)
		1378	PROTOTYPE: $
		1379	CODE:
		1380	set_max_idle (nthreads);
374		1381
375	int	1382	int
376	max_outstanding(nreqs)	1383	max_outstanding (int maxreqs)
377	int nreqs	1384	PROTOTYPE: $
378	PROTOTYPE: $
379	CODE:	1385	CODE:
380	RETVAL = max_outstanding;	1386	RETVAL = max_outstanding;
381	max_outstanding = nreqs;	1387	max_outstanding = maxreqs;
		1388	OUTPUT:
		1389	RETVAL
382		1390
383	void	1391	void
384	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1392	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
385	SV * pathname
386	int flags
387	int mode
388	SV * callback
389	PROTOTYPE: $$$;$	1393	PROTOTYPE: $$$;$
390	CODE:	1394	PPCODE:
391	{	1395	{
392	aio_req req;	1396	dREQ;
393
394	Newz (0, req, 1, aio_cb);
395
396	if (!req)
397	croak ("out of memory during aio_req allocation");
398		1397
399	req->type = REQ_OPEN;	1398	req->type = REQ_OPEN;
400	req->data = newSVsv (pathname);	1399	req->sv1 = newSVsv (pathname);
401	req->dataptr = SvPV_nolen (req->data);	1400	req->ptr1 = SvPVbyte_nolen (req->sv1);
402	req->fd = flags;	1401	req->int1 = flags;
403	req->mode = mode;	1402	req->mode = mode;
404	req->callback = SvREFCNT_inc (callback);
405		1403
406	send_req (req);	1404	REQ_SEND;
407	}	1405	}
408		1406
409	void	1407	void
410	aio_close(fh,callback=&PL_sv_undef)	1408	aio_close (SV *fh, SV *callback=&PL_sv_undef)
411	SV * fh
412	SV * callback
413	PROTOTYPE: $;$	1409	PROTOTYPE: $;$
414	ALIAS:	1410	ALIAS:
415	aio_close = REQ_CLOSE	1411	aio_close = REQ_CLOSE
416	aio_fsync = REQ_FSYNC	1412	aio_fsync = REQ_FSYNC
417	aio_fdatasync = REQ_FDATASYNC	1413	aio_fdatasync = REQ_FDATASYNC
418	CODE:	1414	PPCODE:
419	{	1415	{
420	aio_req req;	1416	dREQ;
421
422	Newz (0, req, 1, aio_cb);
423
424	if (!req)
425	croak ("out of memory during aio_req allocation");
426		1417
427	req->type = ix;	1418	req->type = ix;
428	req->fh = newSVsv (fh);	1419	req->sv1 = newSVsv (fh);
429	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1420	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
430	req->callback = SvREFCNT_inc (callback);
431		1421
432	send_req (req);	1422	REQ_SEND (req);
433	}	1423	}
434		1424
435	void	1425	void
436	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1426	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
437	SV * fh
438	UV offset
439	IV length
440	SV * data
441	IV dataoffset
442	SV * callback
443	ALIAS:	1427	ALIAS:
444	aio_read = REQ_READ	1428	aio_read = REQ_READ
445	aio_write = REQ_WRITE	1429	aio_write = REQ_WRITE
446	PROTOTYPE: $$$$$;$	1430	PROTOTYPE: $$$$$;$
447	CODE:	1431	PPCODE:
448	{	1432	{
449	aio_req req;
450	STRLEN svlen;	1433	STRLEN svlen;
451	char *svptr = SvPV (data, svlen);	1434	char *svptr = SvPVbyte (data, svlen);
		1435	UV len = SvUV (length);
452		1436
453	SvUPGRADE (data, SVt_PV);	1437	SvUPGRADE (data, SVt_PV);
454	SvPOK_on (data);	1438	SvPOK_on (data);
455		1439
456	if (dataoffset < 0)	1440	if (dataoffset < 0)
457	dataoffset += svlen;	1441	dataoffset += svlen;
458		1442
459	if (dataoffset < 0 || dataoffset > svlen)	1443	if (dataoffset < 0 || dataoffset > svlen)
460	croak ("data offset outside of string");	1444	croak ("dataoffset outside of data scalar");
461		1445
462	if (ix == REQ_WRITE)	1446	if (ix == REQ_WRITE)
463	{	1447	{
464	/* write: check length and adjust. */	1448	/* write: check length and adjust. */
465	if (length < 0 || length + dataoffset > svlen)	1449	if (!SvOK (length) || len + dataoffset > svlen)
466	length = svlen - dataoffset;	1450	len = svlen - dataoffset;
467	}	1451	}
468	else	1452	else
469	{	1453	{
470	/* read: grow scalar as necessary */	1454	/* read: grow scalar as necessary */
471	svptr = SvGROW (data, length + dataoffset);	1455	svptr = SvGROW (data, len + dataoffset + 1);
472	}	1456	}
473		1457
474	if (length < 0)	1458	if (len < 0)
475	croak ("length must not be negative");	1459	croak ("length must not be negative");
476		1460
477	Newz (0, req, 1, aio_cb);	1461	{
		1462	dREQ;
478		1463
479	if (!req)
480	croak ("out of memory during aio_req allocation");
481
482	req->type = ix;	1464	req->type = ix;
483	req->fh = newSVsv (fh);	1465	req->sv1 = newSVsv (fh);
484	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1466	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
485	: IoOFP (sv_2io (fh)));	1467	: IoOFP (sv_2io (fh)));
486	req->offset = offset;	1468	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
487	req->length = length;	1469	req->size = len;
488	req->data = SvREFCNT_inc (data);	1470	req->sv2 = SvREFCNT_inc (data);
489	req->dataptr = (char *)svptr + dataoffset;	1471	req->ptr1 = (char *)svptr + dataoffset;
490	req->callback = SvREFCNT_inc (callback);	1472	req->stroffset = dataoffset;
491		1473
492	send_req (req);	1474	if (!SvREADONLY (data))
493	}	1475	{
		1476	SvREADONLY_on (data);
		1477	req->flags |= FLAG_SV2_RO_OFF;
		1478	}
494		1479
		1480	REQ_SEND;
		1481	}
		1482	}
		1483
495	void	1484	void
		1485	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		1486	PROTOTYPE: $$;$
		1487	PPCODE:
		1488	{
		1489	SV *data;
		1490	dREQ;
		1491
		1492	data = newSV (NAME_MAX);
		1493	SvPOK_on (data);
		1494
		1495	req->type = REQ_READLINK;
		1496	req->sv1 = newSVsv (path);
		1497	req->ptr2 = SvPVbyte_nolen (req->sv1);
		1498	req->sv2 = data;
		1499	req->ptr1 = SvPVbyte_nolen (data);
		1500
		1501	REQ_SEND;
		1502	}
		1503
		1504	void
		1505	aio_sendfile (SV *out_fh, SV *in_fh, SV *in_offset, UV length, SV *callback=&PL_sv_undef)
		1506	PROTOTYPE: $$$$;$
		1507	PPCODE:
		1508	{
		1509	dREQ;
		1510
		1511	req->type = REQ_SENDFILE;
		1512	req->sv1 = newSVsv (out_fh);
		1513	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1514	req->sv2 = newSVsv (in_fh);
		1515	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1516	req->offs = SvVAL64 (in_offset);
		1517	req->size = length;
		1518
		1519	REQ_SEND;
		1520	}
		1521
		1522	void
496	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1523	aio_readahead (SV *fh, SV *offset, IV length, SV *callback=&PL_sv_undef)
497	SV * fh
498	UV offset
499	IV length
500	SV * callback
501	PROTOTYPE: $$$;$	1524	PROTOTYPE: $$$;$
502	CODE:	1525	PPCODE:
503	{	1526	{
504	aio_req req;	1527	dREQ;
505
506	if (length < 0)
507	croak ("length must not be negative");
508
509	Newz (0, req, 1, aio_cb);
510
511	if (!req)
512	croak ("out of memory during aio_req allocation");
513		1528
514	req->type = REQ_READAHEAD;	1529	req->type = REQ_READAHEAD;
515	req->fh = newSVsv (fh);	1530	req->sv1 = newSVsv (fh);
516	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1531	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
517	req->offset = offset;	1532	req->offs = SvVAL64 (offset);
518	req->length = length;	1533	req->size = length;
519	req->callback = SvREFCNT_inc (callback);
520		1534
521	send_req (req);	1535	REQ_SEND;
522	}	1536	}
523		1537
524	void	1538	void
525	aio_stat(fh_or_path,callback=&PL_sv_undef)	1539	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
526	SV * fh_or_path
527	SV * callback
528	ALIAS:	1540	ALIAS:
529	aio_stat = REQ_STAT	1541	aio_stat = REQ_STAT
530	aio_lstat = REQ_LSTAT	1542	aio_lstat = REQ_LSTAT
531	CODE:	1543	PPCODE:
532	{	1544	{
533	aio_req req;	1545	dREQ;
534		1546
535	Newz (0, req, 1, aio_cb);	1547	req->ptr2 = malloc (sizeof (Stat_t));
536
537	if (!req)	1548	if (!req->ptr2)
538	croak ("out of memory during aio_req allocation");	1549	{
539		1550	req_destroy (req);
540	New (0, req->statdata, 1, Stat_t);
541
542	if (!req->statdata)
543	croak ("out of memory during aio_req->statdata allocation");	1551	croak ("out of memory during aio_stat statdata allocation");
		1552	}
		1553
		1554	req->flags |= FLAG_PTR2_FREE;
		1555	req->sv1 = newSVsv (fh_or_path);
544		1556
545	if (SvPOK (fh_or_path))	1557	if (SvPOK (fh_or_path))
546	{	1558	{
547	req->type = ix;	1559	req->type = ix;
548	req->data = newSVsv (fh_or_path);
549	req->dataptr = SvPV_nolen (req->data);	1560	req->ptr1 = SvPVbyte_nolen (req->sv1);
550	}	1561	}
551	else	1562	else
552	{	1563	{
553	req->type = REQ_FSTAT;	1564	req->type = REQ_FSTAT;
554	req->fh = newSVsv (fh_or_path);
555	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1565	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
556	}	1566	}
557		1567
558	req->callback = SvREFCNT_inc (callback);	1568	REQ_SEND;
559
560	send_req (req);
561	}	1569	}
562		1570
563	void	1571	void
		1572	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		1573	PPCODE:
		1574	{
		1575	dREQ;
		1576
		1577	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		1578	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		1579	req->sv1 = newSVsv (fh_or_path);
		1580
		1581	if (SvPOK (fh_or_path))
		1582	{
		1583	req->type = REQ_UTIME;
		1584	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1585	}
		1586	else
		1587	{
		1588	req->type = REQ_FUTIME;
		1589	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1590	}
		1591
		1592	REQ_SEND;
		1593	}
		1594
		1595	void
		1596	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		1597	PPCODE:
		1598	{
		1599	dREQ;
		1600
		1601	req->mode = mode;
		1602	req->sv1 = newSVsv (fh_or_path);
		1603
		1604	if (SvPOK (fh_or_path))
		1605	{
		1606	req->type = REQ_CHMOD;
		1607	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1608	}
		1609	else
		1610	{
		1611	req->type = REQ_FCHMOD;
		1612	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1613	}
		1614
		1615	REQ_SEND;
		1616	}
		1617
		1618	void
		1619	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		1620	PPCODE:
		1621	{
		1622	dREQ;
		1623
		1624	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		1625	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		1626	req->sv1 = newSVsv (fh_or_path);
		1627
		1628	if (SvPOK (fh_or_path))
		1629	{
		1630	req->type = REQ_CHOWN;
		1631	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1632	}
		1633	else
		1634	{
		1635	req->type = REQ_FCHOWN;
		1636	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1637	}
		1638
		1639	REQ_SEND;
		1640	}
		1641
		1642	void
564	aio_unlink(pathname,callback=&PL_sv_undef)	1643	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
565	SV * pathname	1644	ALIAS:
566	SV * callback	1645	aio_unlink = REQ_UNLINK
		1646	aio_rmdir = REQ_RMDIR
		1647	aio_readdir = REQ_READDIR
		1648	PPCODE:
		1649	{
		1650	dREQ;
		1651
		1652	req->type = ix;
		1653	req->sv1 = newSVsv (pathname);
		1654	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1655
		1656	REQ_SEND;
		1657	}
		1658
		1659	void
		1660	aio_mkdir (SV8 *pathname, int mode, SV *callback=&PL_sv_undef)
		1661	PPCODE:
		1662	{
		1663	dREQ;
		1664
		1665	req->type = REQ_MKDIR;
		1666	req->sv1 = newSVsv (pathname);
		1667	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1668	req->mode = mode;
		1669
		1670	REQ_SEND;
		1671	}
		1672
		1673	void
		1674	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
		1675	ALIAS:
		1676	aio_link = REQ_LINK
		1677	aio_symlink = REQ_SYMLINK
		1678	aio_rename = REQ_RENAME
		1679	PPCODE:
		1680	{
		1681	dREQ;
		1682
		1683	req->type = ix;
		1684	req->sv2 = newSVsv (oldpath);
		1685	req->ptr2 = SvPVbyte_nolen (req->sv2);
		1686	req->sv1 = newSVsv (newpath);
		1687	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1688
		1689	REQ_SEND;
		1690	}
		1691
		1692	void
		1693	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
		1694	PPCODE:
		1695	{
		1696	dREQ;
		1697
		1698	req->type = REQ_MKNOD;
		1699	req->sv1 = newSVsv (pathname);
		1700	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1701	req->mode = (mode_t)mode;
		1702	req->offs = dev;
		1703
		1704	REQ_SEND;
		1705	}
		1706
		1707	void
		1708	aio_busy (double delay, SV *callback=&PL_sv_undef)
		1709	PPCODE:
		1710	{
		1711	dREQ;
		1712
		1713	req->type = REQ_BUSY;
		1714	req->nv1 = delay < 0. ? 0. : delay;
		1715
		1716	REQ_SEND;
		1717	}
		1718
		1719	void
		1720	aio_group (SV *callback=&PL_sv_undef)
		1721	PROTOTYPE: ;$
		1722	PPCODE:
		1723	{
		1724	dREQ;
		1725
		1726	req->type = REQ_GROUP;
		1727
		1728	req_send (req);
		1729	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1730	}
		1731
		1732	void
		1733	aio_nop (SV *callback=&PL_sv_undef)
		1734	PPCODE:
		1735	{
		1736	dREQ;
		1737
		1738	req->type = REQ_NOP;
		1739
		1740	REQ_SEND;
		1741	}
		1742
		1743	int
		1744	aioreq_pri (int pri = 0)
		1745	PROTOTYPE: ;$
567	CODE:	1746	CODE:
568	{	1747	RETVAL = next_pri - PRI_BIAS;
569	aio_req req;	1748	if (items > 0)
570		1749	{
571	Newz (0, req, 1, aio_cb);	1750	if (pri < PRI_MIN) pri = PRI_MIN;
572		1751	if (pri > PRI_MAX) pri = PRI_MAX;
573	if (!req)	1752	next_pri = pri + PRI_BIAS;
574	croak ("out of memory during aio_req allocation");	1753	}
575		1754	OUTPUT:
576	req->type = REQ_UNLINK;	1755	RETVAL
577	req->data = newSVsv (pathname);
578	req->dataptr = SvPV_nolen (req->data);
579	req->callback = SvREFCNT_inc (callback);
580
581	send_req (req);
582	}
583		1756
584	void	1757	void
		1758	aioreq_nice (int nice = 0)
		1759	CODE:
		1760	nice = next_pri - nice;
		1761	if (nice < PRI_MIN) nice = PRI_MIN;
		1762	if (nice > PRI_MAX) nice = PRI_MAX;
		1763	next_pri = nice + PRI_BIAS;
		1764
		1765	void
585	flush()	1766	flush ()
586	PROTOTYPE:	1767	PROTOTYPE:
587	CODE:	1768	CODE:
588	while (nreqs)	1769	while (nreqs)
589	{	1770	{
590	poll_wait ();	1771	poll_wait ();
591	poll_cb ();	1772	poll_cb ();
592	}	1773	}
593		1774
594	void	1775	int
595	poll()	1776	poll()
596	PROTOTYPE:	1777	PROTOTYPE:
597	CODE:	1778	CODE:
598	if (nreqs)
599	{
600	poll_wait ();	1779	poll_wait ();
601	poll_cb ();	1780	RETVAL = poll_cb ();
602	}	1781	OUTPUT:
		1782	RETVAL
603		1783
604	int	1784	int
605	poll_fileno()	1785	poll_fileno()
606	PROTOTYPE:	1786	PROTOTYPE:
607	CODE:	1787	CODE:
…		…
619		1799
620	void	1800	void
621	poll_wait()	1801	poll_wait()
622	PROTOTYPE:	1802	PROTOTYPE:
623	CODE:	1803	CODE:
624	if (nreqs)
625	poll_wait ();	1804	poll_wait ();
		1805
		1806	void
		1807	setsig (int signum = SIGIO)
		1808	PROTOTYPE: ;$
		1809	CODE:
		1810	{
		1811	if (block_sig_level)
		1812	croak ("cannot call IO::AIO::setsig from within aio_block/callback");
		1813
		1814	LOCK (reslock);
		1815	main_tid = pthread_self ();
		1816	main_sig = signum;
		1817	UNLOCK (reslock);
		1818
		1819	if (main_sig && npending)
		1820	pthread_kill (main_tid, main_sig);
		1821	}
		1822
		1823	void
		1824	aio_block (SV *cb)
		1825	PROTOTYPE: &
		1826	PPCODE:
		1827	{
		1828	int count;
		1829
		1830	block_sig ();
		1831	PUSHMARK (SP);
		1832	PUTBACK;
		1833	count = call_sv (cb, GIMME_V | G_NOARGS | G_EVAL);
		1834	SPAGAIN;
		1835	unblock_sig ();
		1836
		1837	if (SvTRUE (ERRSV))
		1838	croak (0);
		1839
		1840	XSRETURN (count);
		1841	}
626		1842
627	int	1843	int
628	nreqs()	1844	nreqs()
629	PROTOTYPE:	1845	PROTOTYPE:
630	CODE:	1846	CODE:
631	RETVAL = nreqs;	1847	RETVAL = nreqs;
632	OUTPUT:	1848	OUTPUT:
633	RETVAL	1849	RETVAL
634		1850
		1851	int
		1852	nready()
		1853	PROTOTYPE:
		1854	CODE:
		1855	RETVAL = get_nready ();
		1856	OUTPUT:
		1857	RETVAL
		1858
		1859	int
		1860	npending()
		1861	PROTOTYPE:
		1862	CODE:
		1863	RETVAL = get_npending ();
		1864	OUTPUT:
		1865	RETVAL
		1866
		1867	int
		1868	nthreads()
		1869	PROTOTYPE:
		1870	CODE:
		1871	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1872	RETVAL = started;
		1873	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1874	OUTPUT:
		1875	RETVAL
		1876
		1877	PROTOTYPES: DISABLE
		1878
		1879	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1880
		1881	void
		1882	cancel (aio_req_ornot req)
		1883	CODE:
		1884	req_cancel (req);
		1885
		1886	void
		1887	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1888	CODE:
		1889	SvREFCNT_dec (req->callback);
		1890	req->callback = newSVsv (callback);
		1891
		1892	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1893
		1894	void
		1895	add (aio_req grp, ...)
		1896	PPCODE:
		1897	{
		1898	int i;
		1899	aio_req req;
		1900
		1901	if (main_sig && !block_sig_level)
		1902	croak ("aio_group->add called outside aio_block/callback context while IO::AIO::setsig is in use");
		1903
		1904	if (grp->int1 == 2)
		1905	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1906
		1907	for (i = 1; i < items; ++i )
		1908	{
		1909	if (GIMME_V != G_VOID)
		1910	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1911
		1912	req = SvAIO_REQ (ST (i));
		1913
		1914	if (req)
		1915	{
		1916	++grp->size;
		1917	req->grp = grp;
		1918
		1919	req->grp_prev = 0;
		1920	req->grp_next = grp->grp_first;
		1921
		1922	if (grp->grp_first)
		1923	grp->grp_first->grp_prev = req;
		1924
		1925	grp->grp_first = req;
		1926	}
		1927	}
		1928	}
		1929
		1930	void
		1931	cancel_subs (aio_req_ornot req)
		1932	CODE:
		1933	req_cancel_subs (req);
		1934
		1935	void
		1936	result (aio_req grp, ...)
		1937	CODE:
		1938	{
		1939	int i;
		1940	AV *av;
		1941
		1942	grp->errorno = errno;
		1943
		1944	av = newAV ();
		1945
		1946	for (i = 1; i < items; ++i )
		1947	av_push (av, newSVsv (ST (i)));
		1948
		1949	SvREFCNT_dec (grp->sv1);
		1950	grp->sv1 = (SV *)av;
		1951	}
		1952
		1953	void
		1954	errno (aio_req grp, int errorno = errno)
		1955	CODE:
		1956	grp->errorno = errorno;
		1957
		1958	void
		1959	limit (aio_req grp, int limit)
		1960	CODE:
		1961	grp->int2 = limit;
		1962	aio_grp_feed (grp);
		1963
		1964	void
		1965	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1966	CODE:
		1967	{
		1968	SvREFCNT_dec (grp->sv2);
		1969	grp->sv2 = newSVsv (callback);
		1970
		1971	if (grp->int2 <= 0)
		1972	grp->int2 = 2;
		1973
		1974	aio_grp_feed (grp);
		1975	}
		1976

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