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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.15 by root, Sat Jul 23 18:19:56 2005 UTC vs.
Revision 1.60 by root, Mon Oct 23 20:05:27 2006 UTC

		1	#define _REENTRANT 1
		2	#include <errno.h>
		3
1	#include "EXTERN.h"	4	#include "EXTERN.h"
2	#include "perl.h"	5	#include "perl.h"
3	#include "XSUB.h"	6	#include "XSUB.h"
4		7
		8	#include "autoconf/config.h"
		9
		10	#include <pthread.h>
		11
		12	#include <stddef.h>
		13	#include <errno.h>
		14	#include <sys/time.h>
		15	#include <sys/select.h>
5	#include <sys/types.h>	16	#include <sys/types.h>
6	#include <sys/stat.h>	17	#include <sys/stat.h>
7		18	#include <limits.h>
8	#include <unistd.h>	19	#include <unistd.h>
9	#include <fcntl.h>	20	#include <fcntl.h>
10	#include <signal.h>	21	#include <signal.h>
11	#include <sched.h>	22	#include <sched.h>
		23
		24	#if HAVE_SENDFILE
12	#if __linux	25	# if __linux
		26	# include <sys/sendfile.h>
		27	# elif __freebsd
13	#include <sys/syscall.h>	28	# include <sys/socket.h>
		29	# include <sys/uio.h>
		30	# elif __hpux
		31	# include <sys/socket.h>
		32	# elif __solaris /* not yet */
		33	# include <sys/sendfile.h>
		34	# else
		35	# error sendfile support requested but not available
		36	# endif
14	#endif	37	#endif
15		38
16	#include <pthread.h>	39	/* used for struct dirent, AIX doesn't provide it */
17		40	#ifndef NAME_MAX
18	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	41	# define NAME_MAX 4096
19	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	42	#endif
20	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
21		43
22	#if __ia64	44	#if __ia64
23	# define STACKSIZE 65536	45	# define STACKSIZE 65536
24	#else	46	#else
25	# define STACKSIZE 4096	47	# define STACKSIZE 8192
26	#endif	48	#endif
27		49
28	enum {	50	enum {
29	REQ_QUIT,	51	REQ_QUIT,
30	REQ_OPEN, REQ_CLOSE,	52	REQ_OPEN, REQ_CLOSE,
31	REQ_READ, REQ_WRITE, REQ_READAHEAD,	53	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		54	REQ_SENDFILE,
32	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
33	REQ_FSYNC, REQ_FDATASYNC,	56	REQ_FSYNC, REQ_FDATASYNC,
		57	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
		58	REQ_READDIR,
		59	REQ_LINK, REQ_SYMLINK,
		60	REQ_GROUP, REQ_NOP,
		61	REQ_SLEEP,
34	};	62	};
35		63
		64	#define AIO_REQ_KLASS "IO::AIO::REQ"
		65	#define AIO_GRP_KLASS "IO::AIO::GRP"
		66
36	typedef struct aio_cb {	67	typedef struct aio_cb
		68	{
37	struct aio_cb *volatile next;	69	struct aio_cb *volatile next;
38		70
39	int type;	71	SV *data, *callback;
40		72	SV *fh, *fh2;
41	int fd;	73	void *dataptr, *data2ptr;
		74	Stat_t *statdata;
42	off_t offset;	75	off_t offset;
43	size_t length;	76	size_t length;
44	ssize_t result;	77	ssize_t result;
		78
		79	STRLEN dataoffset;
		80	int type;
		81	int fd, fd2;
		82	int errorno;
45	mode_t mode; /* open */	83	mode_t mode; /* open */
46	int errorno;
47	SV *data, *callback, *fh;
48	void *dataptr;
49	STRLEN dataoffset;
50		84
51	Stat_t *statdata;	85	unsigned char flags;
		86	unsigned char pri;
		87
		88	SV *self; /* the perl counterpart of this request, if any */
		89	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
52	} aio_cb;	90	} aio_cb;
53		91
		92	enum {
		93	FLAG_CANCELLED = 0x01,
		94	};
		95
54	typedef aio_cb *aio_req;	96	typedef aio_cb *aio_req;
		97	typedef aio_cb *aio_req_ornot;
55		98
		99	enum {
		100	PRI_MIN = 4,
		101	PRI_MAX = -4,
		102
		103	DEFAULT_PRI = 0,
		104	PRI_BIAS = PRI_MIN,
		105	};
		106
		107	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		108
56	static int started;	109	static int started, wanted;
57	static volatile int nreqs;	110	static volatile int nreqs;
58	static int max_outstanding = 1<<30;	111	static int max_outstanding = 1<<30;
59	static int respipe [2];	112	static int respipe [2];
60		113
61	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	114	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
…		…
63	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	116	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
64		117
65	static volatile aio_req reqs, reqe; /* queue start, queue end */	118	static volatile aio_req reqs, reqe; /* queue start, queue end */
66	static volatile aio_req ress, rese; /* queue start, queue end */	119	static volatile aio_req ress, rese; /* queue start, queue end */
67		120
68	static void	121	static void req_invoke (aio_req req);
69	poll_wait ()	122	static void req_free (aio_req req);
		123
		124	/* must be called at most once */
		125	static SV *req_sv (aio_req req, const char *klass)
70	{	126	{
71	if (nreqs && !ress)	127	if (!req->self)
		128	{
		129	req->self = (SV *)newHV ();
		130	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
72	{	131	}
		132
		133	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		134	}
		135
		136	static aio_req SvAIO_REQ (SV *sv)
		137	{
		138	MAGIC *mg;
		139
		140	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		141	croak ("object of class " AIO_REQ_KLASS " expected");
		142
		143	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		144
		145	return mg ? (aio_req)mg->mg_ptr : 0;
		146	}
		147
		148	static void aio_grp_feed (aio_req grp)
		149	{
		150	while (grp->length < grp->fd2 && !(grp->flags & FLAG_CANCELLED))
		151	{
		152	int old_len = grp->length;
		153
		154	if (grp->fh2 && SvOK (grp->fh2))
		155	{
		156	dSP;
		157
		158	ENTER;
		159	SAVETMPS;
		160	PUSHMARK (SP);
		161	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		162	PUTBACK;
		163	call_sv (grp->fh2, G_VOID | G_EVAL);
		164	SPAGAIN;
		165	FREETMPS;
		166	LEAVE;
		167	}
		168
		169	/* stop if no progress has been made */
		170	if (old_len == grp->length)
		171	{
		172	SvREFCNT_dec (grp->fh2);
		173	grp->fh2 = 0;
		174	break;
		175	}
		176	}
		177	}
		178
		179	static void aio_grp_dec (aio_req grp)
		180	{
		181	--grp->length;
		182
		183	/* call feeder, if applicable */
		184	aio_grp_feed (grp);
		185
		186	/* finish, if done */
		187	if (!grp->length && grp->fd)
		188	{
		189	req_invoke (grp);
		190	req_free (grp);
		191	}
		192	}
		193
		194	static void poll_wait ()
		195	{
		196	while (nreqs)
		197	{
		198	aio_req req;
		199	pthread_mutex_lock (&reslock);
		200	req = ress;
		201	pthread_mutex_unlock (&reslock);
		202
		203	if (req)
		204	return;
		205
73	fd_set rfd;	206	fd_set rfd;
74	FD_ZERO(&rfd);	207	FD_ZERO(&rfd);
75	FD_SET(respipe [0], &rfd);	208	FD_SET(respipe [0], &rfd);
76		209
77	select (respipe [0] + 1, &rfd, 0, 0, 0);	210	select (respipe [0] + 1, &rfd, 0, 0, 0);
78	}	211	}
79	}	212	}
80		213
81	static int	214	static void req_invoke (aio_req req)
82	poll_cb ()	215	{
		216	dSP;
		217	int errorno = errno;
		218
		219	if (req->flags & FLAG_CANCELLED || !SvOK (req->callback))
		220	return;
		221
		222	errno = req->errorno;
		223
		224	ENTER;
		225	SAVETMPS;
		226	PUSHMARK (SP);
		227	EXTEND (SP, 1);
		228
		229	switch (req->type)
		230	{
		231	case REQ_READDIR:
		232	{
		233	SV *rv = &PL_sv_undef;
		234
		235	if (req->result >= 0)
		236	{
		237	char *buf = req->data2ptr;
		238	AV *av = newAV ();
		239
		240	while (req->result)
		241	{
		242	SV *sv = newSVpv (buf, 0);
		243
		244	av_push (av, sv);
		245	buf += SvCUR (sv) + 1;
		246	req->result--;
		247	}
		248
		249	rv = sv_2mortal (newRV_noinc ((SV *)av));
		250	}
		251
		252	PUSHs (rv);
		253	}
		254	break;
		255
		256	case REQ_OPEN:
		257	{
		258	/* convert fd to fh */
		259	SV *fh;
		260
		261	PUSHs (sv_2mortal (newSViv (req->result)));
		262	PUTBACK;
		263	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		264	SPAGAIN;
		265
		266	fh = SvREFCNT_inc (POPs);
		267
		268	PUSHMARK (SP);
		269	XPUSHs (sv_2mortal (fh));
		270	}
		271	break;
		272
		273	case REQ_GROUP:
		274	req->fd = 2; /* mark group as finished */
		275
		276	if (req->data)
		277	{
		278	int i;
		279	AV *av = (AV *)req->data;
		280
		281	EXTEND (SP, AvFILL (av) + 1);
		282	for (i = 0; i <= AvFILL (av); ++i)
		283	PUSHs (*av_fetch (av, i, 0));
		284	}
		285	break;
		286
		287	case REQ_NOP:
		288	case REQ_SLEEP:
		289	break;
		290
		291	default:
		292	PUSHs (sv_2mortal (newSViv (req->result)));
		293	break;
		294	}
		295
		296
		297	PUTBACK;
		298	call_sv (req->callback, G_VOID | G_EVAL);
		299	SPAGAIN;
		300
		301	FREETMPS;
		302	LEAVE;
		303
		304	errno = errorno;
		305
		306	if (SvTRUE (ERRSV))
		307	{
		308	req_free (req);
		309	croak (0);
		310	}
		311	}
		312
		313	static void req_free (aio_req req)
		314	{
		315	if (req->grp)
		316	{
		317	aio_req grp = req->grp;
		318
		319	/* unlink request */
		320	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		321	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		322
		323	if (grp->grp_first == req)
		324	grp->grp_first = req->grp_next;
		325
		326	aio_grp_dec (grp);
		327	}
		328
		329	if (req->self)
		330	{
		331	sv_unmagic (req->self, PERL_MAGIC_ext);
		332	SvREFCNT_dec (req->self);
		333	}
		334
		335	SvREFCNT_dec (req->data);
		336	SvREFCNT_dec (req->fh);
		337	SvREFCNT_dec (req->fh2);
		338	SvREFCNT_dec (req->callback);
		339	Safefree (req->statdata);
		340
		341	if (req->type == REQ_READDIR && req->result >= 0)
		342	free (req->data2ptr);
		343
		344	Safefree (req);
		345	}
		346
		347	static void req_cancel (aio_req req)
		348	{
		349	req->flags |= FLAG_CANCELLED;
		350
		351	if (req->type == REQ_GROUP)
		352	{
		353	aio_req sub;
		354
		355	for (sub = req->grp_first; sub; sub = sub->grp_next)
		356	req_cancel (sub);
		357	}
		358	}
		359
		360	static int poll_cb ()
83	{	361	{
84	dSP;	362	dSP;
85	int count = 0;	363	int count = 0;
		364	int do_croak = 0;
86	aio_req req, prv;	365	aio_req req;
87		366
		367	for (;;)
		368	{
88	pthread_mutex_lock (&reslock);	369	pthread_mutex_lock (&reslock);
		370	req = ress;
89		371
90	{	372	if (req)
		373	{
		374	ress = req->next;
		375
		376	if (!ress)
		377	{
91	/* read any signals sent by the worker threads */	378	/* read any signals sent by the worker threads */
92	char buf [32];	379	char buf [32];
93	while (read (respipe [0], buf, 32) > 0)	380	while (read (respipe [0], buf, 32) == 32)
		381	;
		382
		383	rese = 0;
		384	}
94	;	385	}
95	}
96		386
97	req = ress;
98	ress = rese = 0;
99
100	pthread_mutex_unlock (&reslock);	387	pthread_mutex_unlock (&reslock);
101		388
102	while (req)	389	if (!req)
103	{	390	break;
		391
104	nreqs--;	392	--nreqs;
105		393
106	if (req->type == REQ_QUIT)	394	if (req->type == REQ_QUIT)
107	started--;	395	started--;
		396	else if (req->type == REQ_GROUP && req->length)
		397	{
		398	req->fd = 1; /* mark request as delayed */
		399	continue;
		400	}
108	else	401	else
109	{	402	{
110	int errorno = errno;
111	errno = req->errorno;
112
113	if (req->type == REQ_READ)	403	if (req->type == REQ_READ)
114	SvCUR_set (req->data, req->dataoffset	404	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
115	+ req->result > 0 ? req->result : 0);
116		405
		406	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		407	SvREADONLY_off (req->data);
		408
117	if (req->data)	409	if (req->statdata)
118	SvREFCNT_dec (req->data);
119
120	if (req->fh)
121	SvREFCNT_dec (req->fh);
122
123	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
124	{	410	{
125	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	411	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
126	PL_laststatval = req->result;	412	PL_laststatval = req->result;
127	PL_statcache = *(req->statdata);	413	PL_statcache = *(req->statdata);
128
129	Safefree (req->statdata);
130	}	414	}
131		415
132	ENTER;	416	req_invoke (req);
133	PUSHMARK (SP);
134	XPUSHs (sv_2mortal (newSViv (req->result)));
135		417
136	if (req->type == REQ_OPEN)
137	{
138	/* convert fd to fh */
139	SV *fh;
140
141	PUTBACK;
142	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
143	SPAGAIN;
144
145	fh = SvREFCNT_inc (POPs);
146
147	PUSHMARK (SP);
148	XPUSHs (sv_2mortal (fh));
149	}
150
151	if (SvOK (req->callback))
152	{
153	PUTBACK;
154	call_sv (req->callback, G_VOID | G_EVAL);
155	SPAGAIN;
156	}
157
158	LEAVE;
159
160	if (req->callback)
161	SvREFCNT_dec (req->callback);
162
163	errno = errorno;
164	count++;	418	count++;
165	}	419	}
166		420
167	prv = req;
168	req = req->next;
169	Safefree (prv);	421	req_free (req);
170
171	/* TODO: croak on errors? */
172	}	422	}
173		423
174	return count;	424	return count;
175	}	425	}
176		426
177	static void *aio_proc(void *arg);	427	static void *aio_proc(void *arg);
178		428
179	static void
180	start_thread (void)	429	static void start_thread (void)
181	{	430	{
182	sigset_t fullsigset, oldsigset;	431	sigset_t fullsigset, oldsigset;
183	pthread_t tid;	432	pthread_t tid;
184	pthread_attr_t attr;	433	pthread_attr_t attr;
185		434
…		…
194	started++;	443	started++;
195		444
196	sigprocmask (SIG_SETMASK, &oldsigset, 0);	445	sigprocmask (SIG_SETMASK, &oldsigset, 0);
197	}	446	}
198		447
199	static void	448	static void req_send (aio_req req)
200	send_req (aio_req req)
201	{	449	{
		450	while (started < wanted && nreqs >= started)
		451	start_thread ();
		452
202	nreqs++;	453	++nreqs;
203		454
204	pthread_mutex_lock (&reqlock);	455	pthread_mutex_lock (&reqlock);
205		456
206	req->next = 0;	457	req->next = 0;
207		458
…		…
214	reqe = reqs = req;	465	reqe = reqs = req;
215		466
216	pthread_cond_signal (&reqwait);	467	pthread_cond_signal (&reqwait);
217	pthread_mutex_unlock (&reqlock);	468	pthread_mutex_unlock (&reqlock);
218		469
219	while (nreqs > max_outstanding)	470	if (nreqs > max_outstanding)
		471	for (;;)
		472	{
		473	poll_cb ();
		474
		475	if (nreqs <= max_outstanding)
		476	break;
		477
		478	poll_wait ();
		479	}
		480	}
		481
		482	static void end_thread (void)
		483	{
		484	aio_req req;
		485	Newz (0, req, 1, aio_cb);
		486	req->type = REQ_QUIT;
		487
		488	req_send (req);
		489	}
		490
		491	static void min_parallel (int nthreads)
		492	{
		493	if (wanted < nthreads)
		494	wanted = nthreads;
		495	}
		496
		497	static void max_parallel (int nthreads)
		498	{
		499	int cur = started;
		500
		501	if (wanted > nthreads)
		502	wanted = nthreads;
		503
		504	while (cur > wanted)
		505	{
		506	end_thread ();
		507	cur--;
		508	}
		509
		510	while (started > wanted)
220	{	511	{
221	poll_wait ();	512	poll_wait ();
222	poll_cb ();	513	poll_cb ();
223	}	514	}
224	}	515	}
225		516
226	static void	517	static void create_pipe ()
227	end_thread (void)
228	{	518	{
229	aio_req req;	519	if (pipe (respipe))
230	New (0, req, 1, aio_cb);	520	croak ("unable to initialize result pipe");
231	req->type = REQ_QUIT;
232		521
233	send_req (req);	522	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
234	}	523	croak ("cannot set result pipe to nonblocking mode");
235		524
236	static void *	525	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		526	croak ("cannot set result pipe to nonblocking mode");
		527	}
		528
		529	/*****************************************************************************/
		530	/* work around various missing functions */
		531
		532	#if !HAVE_PREADWRITE
		533	# define pread aio_pread
		534	# define pwrite aio_pwrite
		535
		536	/*
		537	* make our pread/pwrite safe against themselves, but not against
		538	* normal read/write by using a mutex. slows down execution a lot,
		539	* but that's your problem, not mine.
		540	*/
		541	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
		542
		543	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		544	{
		545	ssize_t res;
		546	off_t ooffset;
		547
		548	pthread_mutex_lock (&preadwritelock);
		549	ooffset = lseek (fd, 0, SEEK_CUR);
		550	lseek (fd, offset, SEEK_SET);
		551	res = read (fd, buf, count);
		552	lseek (fd, ooffset, SEEK_SET);
		553	pthread_mutex_unlock (&preadwritelock);
		554
		555	return res;
		556	}
		557
		558	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		559	{
		560	ssize_t res;
		561	off_t ooffset;
		562
		563	pthread_mutex_lock (&preadwritelock);
		564	ooffset = lseek (fd, 0, SEEK_CUR);
		565	lseek (fd, offset, SEEK_SET);
		566	res = write (fd, buf, count);
		567	lseek (fd, offset, SEEK_SET);
		568	pthread_mutex_unlock (&preadwritelock);
		569
		570	return res;
		571	}
		572	#endif
		573
		574	#if !HAVE_FDATASYNC
		575	# define fdatasync fsync
		576	#endif
		577
		578	#if !HAVE_READAHEAD
		579	# define readahead aio_readahead
		580
		581	static ssize_t readahead (int fd, off_t offset, size_t count)
		582	{
		583	char readahead_buf[4096];
		584
		585	while (count > 0)
		586	{
		587	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
		588
		589	pread (fd, readahead_buf, len, offset);
		590	offset += len;
		591	count -= len;
		592	}
		593
		594	errno = 0;
		595	}
		596	#endif
		597
		598	#if !HAVE_READDIR_R
		599	# define readdir_r aio_readdir_r
		600
		601	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		602
		603	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		604	{
		605	struct dirent *e;
		606	int errorno;
		607
		608	pthread_mutex_lock (&readdirlock);
		609
		610	e = readdir (dirp);
		611	errorno = errno;
		612
		613	if (e)
		614	{
		615	*res = ent;
		616	strcpy (ent->d_name, e->d_name);
		617	}
		618	else
		619	*res = 0;
		620
		621	pthread_mutex_unlock (&readdirlock);
		622
		623	errno = errorno;
		624	return e ? 0 : -1;
		625	}
		626	#endif
		627
		628	/* sendfile always needs emulation */
		629	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
		630	{
		631	ssize_t res;
		632
		633	if (!count)
		634	return 0;
		635
		636	#if HAVE_SENDFILE
		637	# if __linux
		638	res = sendfile (ofd, ifd, &offset, count);
		639
		640	# elif __freebsd
		641	/*
		642	* Of course, the freebsd sendfile is a dire hack with no thoughts
		643	* wasted on making it similar to other I/O functions.
		644	*/
		645	{
		646	off_t sbytes;
		647	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		648
		649	if (res < 0 && sbytes)
		650	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
		651	res = sbytes;
		652	}
		653
		654	# elif __hpux
		655	res = sendfile (ofd, ifd, offset, count, 0, 0);
		656
		657	# elif __solaris
		658	{
		659	struct sendfilevec vec;
		660	size_t sbytes;
		661
		662	vec.sfv_fd = ifd;
		663	vec.sfv_flag = 0;
		664	vec.sfv_off = offset;
		665	vec.sfv_len = count;
		666
		667	res = sendfilev (ofd, &vec, 1, &sbytes);
		668
		669	if (res < 0 && sbytes)
		670	res = sbytes;
		671	}
		672
		673	# endif
		674	#else
		675	res = -1;
		676	errno = ENOSYS;
		677	#endif
		678
		679	if (res < 0
		680	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		681	#if __solaris
		682	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		683	#endif
		684	)
		685	)
		686	{
		687	/* emulate sendfile. this is a major pain in the ass */
		688	char buf[4096];
		689	res = 0;
		690
		691	while (count)
		692	{
		693	ssize_t cnt;
		694
		695	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
		696
		697	if (cnt <= 0)
		698	{
		699	if (cnt && !res) res = -1;
		700	break;
		701	}
		702
		703	cnt = write (ofd, buf, cnt);
		704
		705	if (cnt <= 0)
		706	{
		707	if (cnt && !res) res = -1;
		708	break;
		709	}
		710
		711	offset += cnt;
		712	res += cnt;
		713	count -= cnt;
		714	}
		715	}
		716
		717	return res;
		718	}
		719
		720	/* read a full directory */
		721	static int scandir_ (const char *path, void **namesp)
		722	{
		723	DIR *dirp = opendir (path);
		724	union
		725	{
		726	struct dirent d;
		727	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		728	} u;
		729	struct dirent *entp;
		730	char *name, *names;
		731	int memlen = 4096;
		732	int memofs = 0;
		733	int res = 0;
		734	int errorno;
		735
		736	if (!dirp)
		737	return -1;
		738
		739	names = malloc (memlen);
		740
		741	for (;;)
		742	{
		743	errno = 0, readdir_r (dirp, &u.d, &entp);
		744
		745	if (!entp)
		746	break;
		747
		748	name = entp->d_name;
		749
		750	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		751	{
		752	int len = strlen (name) + 1;
		753
		754	res++;
		755
		756	while (memofs + len > memlen)
		757	{
		758	memlen *= 2;
		759	names = realloc (names, memlen);
		760	if (!names)
		761	break;
		762	}
		763
		764	memcpy (names + memofs, name, len);
		765	memofs += len;
		766	}
		767	}
		768
		769	errorno = errno;
		770	closedir (dirp);
		771
		772	if (errorno)
		773	{
		774	free (names);
		775	errno = errorno;
		776	res = -1;
		777	}
		778
		779	*namesp = (void *)names;
		780	return res;
		781	}
		782
		783	/*****************************************************************************/
		784
237	aio_proc (void *thr_arg)	785	static void *aio_proc (void *thr_arg)
238	{	786	{
239	aio_req req;	787	aio_req req;
240	int type;	788	int type;
241		789
242	do	790	do
…		…
260	}	808	}
261		809
262	pthread_mutex_unlock (&reqlock);	810	pthread_mutex_unlock (&reqlock);
263		811
264	errno = 0; /* strictly unnecessary */	812	errno = 0; /* strictly unnecessary */
		813	type = req->type; /* remember type for QUIT check */
265		814
266	type = req->type;	815	if (!(req->flags & FLAG_CANCELLED))
267
268	switch (type)	816	switch (type)
269	{	817	{
270	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	818	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;	819	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
272	#if SYS_readahead	820
273	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	821	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
274	#else	822	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
275	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
276	#endif
277		823
278	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	824	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
279	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	825	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
280	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	826	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
281		827
282	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	828	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
283	case REQ_CLOSE: req->result = close (req->fd); break;	829	case REQ_CLOSE: req->result = close (req->fd); break;
284	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	830	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
285
286	case REQ_FSYNC: req->result = fsync (req->fd); break;	831	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		832	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		833	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
		834	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
		835
287	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	836	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
		837	case REQ_FSYNC: req->result = fsync (req->fd); break;
		838	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
288		839
		840	case REQ_SLEEP:
		841	{
		842	struct timeval tv;
		843
		844	tv.tv_sec = req->fd;
		845	tv.tv_usec = req->fd2;
		846
		847	req->result = select (0, 0, 0, 0, &tv);
		848	}
		849
		850	case REQ_GROUP:
		851	case REQ_NOP:
289	case REQ_QUIT:	852	case REQ_QUIT:
290	break;	853	break;
291		854
292	default:	855	default:
293	req->result = ENOSYS;	856	req->result = ENOSYS;
294	break;	857	break;
295	}	858	}
296		859
297	req->errorno = errno;	860	req->errorno = errno;
298		861
299	pthread_mutex_lock (&reslock);	862	pthread_mutex_lock (&reslock);
300		863
…		…
318	while (type != REQ_QUIT);	881	while (type != REQ_QUIT);
319		882
320	return 0;	883	return 0;
321	}	884	}
322		885
		886	/*****************************************************************************/
		887
		888	static void atfork_prepare (void)
		889	{
		890	pthread_mutex_lock (&reqlock);
		891	pthread_mutex_lock (&reslock);
		892	#if !HAVE_PREADWRITE
		893	pthread_mutex_lock (&preadwritelock);
		894	#endif
		895	#if !HAVE_READDIR_R
		896	pthread_mutex_lock (&readdirlock);
		897	#endif
		898	}
		899
		900	static void atfork_parent (void)
		901	{
		902	#if !HAVE_READDIR_R
		903	pthread_mutex_unlock (&readdirlock);
		904	#endif
		905	#if !HAVE_PREADWRITE
		906	pthread_mutex_unlock (&preadwritelock);
		907	#endif
		908	pthread_mutex_unlock (&reslock);
		909	pthread_mutex_unlock (&reqlock);
		910	}
		911
		912	static void atfork_child (void)
		913	{
		914	aio_req prv;
		915
		916	started = 0;
		917
		918	while (reqs)
		919	{
		920	prv = reqs;
		921	reqs = prv->next;
		922	req_free (prv);
		923	}
		924
		925	reqs = reqe = 0;
		926
		927	while (ress)
		928	{
		929	prv = ress;
		930	ress = prv->next;
		931	req_free (prv);
		932	}
		933
		934	ress = rese = 0;
		935
		936	close (respipe [0]);
		937	close (respipe [1]);
		938	create_pipe ();
		939
		940	atfork_parent ();
		941	}
		942
		943	#define dREQ \
		944	aio_req req; \
		945	int req_pri = next_pri; \
		946	next_pri = DEFAULT_PRI + PRI_BIAS; \
		947	\
		948	if (SvOK (callback) && !SvROK (callback)) \
		949	croak ("callback must be undef or of reference type"); \
		950	\
		951	Newz (0, req, 1, aio_cb); \
		952	if (!req) \
		953	croak ("out of memory during aio_req allocation"); \
		954	\
		955	req->callback = newSVsv (callback); \
		956	req->pri = req_pri
		957
		958	#define REQ_SEND \
		959	req_send (req); \
		960	\
		961	if (GIMME_V != G_VOID) \
		962	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		963
323	MODULE = IO::AIO PACKAGE = IO::AIO	964	MODULE = IO::AIO PACKAGE = IO::AIO
324		965
325	PROTOTYPES: ENABLE	966	PROTOTYPES: ENABLE
326		967
327	BOOT:	968	BOOT:
328	{	969	{
329	if (pipe (respipe))	970	HV *stash = gv_stashpv ("IO::AIO", 1);
330	croak ("unable to initialize result pipe");	971	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		972	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		973	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
331		974
332	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	975	create_pipe ();
333	croak ("cannot set result pipe to nonblocking mode");	976	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
334
335	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
336	croak ("cannot set result pipe to nonblocking mode");
337	}	977	}
338		978
339	void	979	void
340	min_parallel(nthreads)	980	min_parallel (nthreads)
341	int nthreads	981	int nthreads
342	PROTOTYPE: $	982	PROTOTYPE: $
343	CODE:
344	while (nthreads > started)
345	start_thread ();
346		983
347	void	984	void
348	max_parallel(nthreads)	985	max_parallel (nthreads)
349	int nthreads	986	int nthreads
350	PROTOTYPE: $	987	PROTOTYPE: $
351	CODE:
352	{
353	int cur = started;
354	while (cur > nthreads)
355	{
356	end_thread ();
357	cur--;
358	}
359
360	while (started > nthreads)
361	{
362	poll_wait ();
363	poll_cb ();
364	}
365	}
366		988
367	int	989	int
368	max_outstanding(nreqs)	990	max_outstanding (nreqs)
369	int nreqs	991	int nreqs
370	PROTOTYPE: $	992	PROTOTYPE: $
371	CODE:	993	CODE:
372	RETVAL = max_outstanding;	994	RETVAL = max_outstanding;
373	max_outstanding = nreqs;	995	max_outstanding = nreqs;
374		996
375	void	997	void
376	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	998	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
377	SV * pathname	999	SV * pathname
378	int flags	1000	int flags
379	int mode	1001	int mode
380	SV * callback	1002	SV * callback
381	PROTOTYPE: $$$;$	1003	PROTOTYPE: $$$;$
382	CODE:	1004	PPCODE:
383	{	1005	{
384	aio_req req;	1006	dREQ;
385
386	Newz (0, req, 1, aio_cb);
387
388	if (!req)
389	croak ("out of memory during aio_req allocation");
390		1007
391	req->type = REQ_OPEN;	1008	req->type = REQ_OPEN;
392	req->data = newSVsv (pathname);	1009	req->data = newSVsv (pathname);
393	req->dataptr = SvPV_nolen (req->data);	1010	req->dataptr = SvPVbyte_nolen (req->data);
394	req->fd = flags;	1011	req->fd = flags;
395	req->mode = mode;	1012	req->mode = mode;
396	req->callback = SvREFCNT_inc (callback);
397		1013
398	send_req (req);	1014	REQ_SEND;
399	}	1015	}
400		1016
401	void	1017	void
402	aio_close(fh,callback=&PL_sv_undef)	1018	aio_close (fh,callback=&PL_sv_undef)
403	SV * fh	1019	SV * fh
404	SV * callback	1020	SV * callback
405	PROTOTYPE: $;$	1021	PROTOTYPE: $;$
406	ALIAS:	1022	ALIAS:
407	aio_close = REQ_CLOSE	1023	aio_close = REQ_CLOSE
408	aio_fsync = REQ_FSYNC	1024	aio_fsync = REQ_FSYNC
409	aio_fdatasync = REQ_FDATASYNC	1025	aio_fdatasync = REQ_FDATASYNC
410	CODE:	1026	PPCODE:
411	{	1027	{
412	aio_req req;	1028	dREQ;
413
414	Newz (0, req, 1, aio_cb);
415
416	if (!req)
417	croak ("out of memory during aio_req allocation");
418		1029
419	req->type = ix;	1030	req->type = ix;
420	req->fh = newSVsv (fh);	1031	req->fh = newSVsv (fh);
421	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1032	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
422	req->callback = SvREFCNT_inc (callback);
423		1033
424	send_req (req);	1034	REQ_SEND (req);
425	}	1035	}
426		1036
427	void	1037	void
428	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1038	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
429	SV * fh	1039	SV * fh
430	UV offset	1040	UV offset
431	IV length	1041	UV length
432	SV * data	1042	SV * data
433	IV dataoffset	1043	UV dataoffset
434	SV * callback	1044	SV * callback
435	ALIAS:	1045	ALIAS:
436	aio_read = REQ_READ	1046	aio_read = REQ_READ
437	aio_write = REQ_WRITE	1047	aio_write = REQ_WRITE
438	PROTOTYPE: $$$$$;$	1048	PROTOTYPE: $$$$$;$
439	CODE:	1049	PPCODE:
440	{	1050	{
441	aio_req req;	1051	aio_req req;
442	STRLEN svlen;	1052	STRLEN svlen;
443	char *svptr = SvPV (data, svlen);	1053	char *svptr = SvPVbyte (data, svlen);
444		1054
445	SvUPGRADE (data, SVt_PV);	1055	SvUPGRADE (data, SVt_PV);
446	SvPOK_on (data);	1056	SvPOK_on (data);
447		1057
448	if (dataoffset < 0)	1058	if (dataoffset < 0)
…		…
464	}	1074	}
465		1075
466	if (length < 0)	1076	if (length < 0)
467	croak ("length must not be negative");	1077	croak ("length must not be negative");
468		1078
469	Newz (0, req, 1, aio_cb);	1079	{
		1080	dREQ;
470		1081
471	if (!req)
472	croak ("out of memory during aio_req allocation");
473
474	req->type = ix;	1082	req->type = ix;
475	req->fh = newSVsv (fh);	1083	req->fh = newSVsv (fh);
476	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1084	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
477	: IoOFP (sv_2io (fh)));	1085	: IoOFP (sv_2io (fh)));
478	req->offset = offset;	1086	req->offset = offset;
		1087	req->length = length;
		1088	req->data = SvREFCNT_inc (data);
		1089	req->dataptr = (char *)svptr + dataoffset;
		1090
		1091	if (!SvREADONLY (data))
		1092	{
		1093	SvREADONLY_on (data);
		1094	req->data2ptr = (void *)data;
		1095	}
		1096
		1097	REQ_SEND;
		1098	}
		1099	}
		1100
		1101	void
		1102	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1103	SV * out_fh
		1104	SV * in_fh
		1105	UV in_offset
		1106	UV length
		1107	SV * callback
		1108	PROTOTYPE: $$$$;$
		1109	PPCODE:
		1110	{
		1111	dREQ;
		1112
		1113	req->type = REQ_SENDFILE;
		1114	req->fh = newSVsv (out_fh);
		1115	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1116	req->fh2 = newSVsv (in_fh);
		1117	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1118	req->offset = in_offset;
479	req->length = length;	1119	req->length = length;
480	req->data = SvREFCNT_inc (data);
481	req->dataptr = (char *)svptr + dataoffset;
482	req->callback = SvREFCNT_inc (callback);
483		1120
484	send_req (req);	1121	REQ_SEND;
485	}	1122	}
486		1123
487	void	1124	void
488	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1125	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
489	SV * fh	1126	SV * fh
490	UV offset	1127	UV offset
491	IV length	1128	IV length
492	SV * callback	1129	SV * callback
493	PROTOTYPE: $$$;$	1130	PROTOTYPE: $$$;$
494	CODE:	1131	PPCODE:
495	{	1132	{
496	aio_req req;	1133	dREQ;
497
498	if (length < 0)
499	croak ("length must not be negative");
500
501	Newz (0, req, 1, aio_cb);
502
503	if (!req)
504	croak ("out of memory during aio_req allocation");
505		1134
506	req->type = REQ_READAHEAD;	1135	req->type = REQ_READAHEAD;
507	req->fh = newSVsv (fh);	1136	req->fh = newSVsv (fh);
508	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1137	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
509	req->offset = offset;	1138	req->offset = offset;
510	req->length = length;	1139	req->length = length;
511	req->callback = SvREFCNT_inc (callback);
512		1140
513	send_req (req);	1141	REQ_SEND;
514	}	1142	}
515		1143
516	void	1144	void
517	aio_stat(fh_or_path,callback=&PL_sv_undef)	1145	aio_stat (fh_or_path,callback=&PL_sv_undef)
518	SV * fh_or_path	1146	SV * fh_or_path
519	SV * callback	1147	SV * callback
520	ALIAS:	1148	ALIAS:
521	aio_stat = REQ_STAT	1149	aio_stat = REQ_STAT
522	aio_lstat = REQ_LSTAT	1150	aio_lstat = REQ_LSTAT
523	CODE:	1151	PPCODE:
524	{	1152	{
525	aio_req req;	1153	dREQ;
526
527	Newz (0, req, 1, aio_cb);
528
529	if (!req)
530	croak ("out of memory during aio_req allocation");
531		1154
532	New (0, req->statdata, 1, Stat_t);	1155	New (0, req->statdata, 1, Stat_t);
533
534	if (!req->statdata)	1156	if (!req->statdata)
		1157	{
		1158	req_free (req);
535	croak ("out of memory during aio_req->statdata allocation");	1159	croak ("out of memory during aio_req->statdata allocation");
		1160	}
536		1161
537	if (SvPOK (fh_or_path))	1162	if (SvPOK (fh_or_path))
538	{	1163	{
539	req->type = ix;	1164	req->type = ix;
540	req->data = newSVsv (fh_or_path);	1165	req->data = newSVsv (fh_or_path);
541	req->dataptr = SvPV_nolen (req->data);	1166	req->dataptr = SvPVbyte_nolen (req->data);
542	}	1167	}
543	else	1168	else
544	{	1169	{
545	req->type = REQ_FSTAT;	1170	req->type = REQ_FSTAT;
546	req->fh = newSVsv (fh_or_path);	1171	req->fh = newSVsv (fh_or_path);
547	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1172	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
548	}	1173	}
549		1174
550	req->callback = SvREFCNT_inc (callback);	1175	REQ_SEND;
551
552	send_req (req);
553	}	1176	}
554		1177
555	void	1178	void
556	aio_unlink(pathname,callback=&PL_sv_undef)	1179	aio_unlink (pathname,callback=&PL_sv_undef)
557	SV * pathname	1180	SV * pathname
558	SV * callback	1181	SV * callback
		1182	ALIAS:
		1183	aio_unlink = REQ_UNLINK
		1184	aio_rmdir = REQ_RMDIR
		1185	aio_readdir = REQ_READDIR
		1186	PPCODE:
		1187	{
		1188	dREQ;
		1189
		1190	req->type = ix;
		1191	req->data = newSVsv (pathname);
		1192	req->dataptr = SvPVbyte_nolen (req->data);
		1193
		1194	REQ_SEND;
		1195	}
		1196
		1197	void
		1198	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1199	SV * oldpath
		1200	SV * newpath
		1201	SV * callback
		1202	ALIAS:
		1203	aio_link = REQ_LINK
		1204	aio_symlink = REQ_SYMLINK
		1205	aio_rename = REQ_RENAME
		1206	PPCODE:
		1207	{
		1208	dREQ;
		1209
		1210	req->type = ix;
		1211	req->fh = newSVsv (oldpath);
		1212	req->data2ptr = SvPVbyte_nolen (req->fh);
		1213	req->data = newSVsv (newpath);
		1214	req->dataptr = SvPVbyte_nolen (req->data);
		1215
		1216	REQ_SEND;
		1217	}
		1218
		1219	void
		1220	aio_sleep (delay,callback=&PL_sv_undef)
		1221	double delay
		1222	SV * callback
		1223	PPCODE:
		1224	{
		1225	dREQ;
		1226
		1227	req->type = REQ_SLEEP;
		1228	req->fd = delay < 0. ? 0 : delay;
		1229	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1230
		1231	REQ_SEND;
		1232	}
		1233
		1234	void
		1235	aio_group (callback=&PL_sv_undef)
		1236	SV * callback
		1237	PROTOTYPE: ;$
		1238	PPCODE:
		1239	{
		1240	dREQ;
		1241
		1242	req->type = REQ_GROUP;
		1243	req_send (req);
		1244
		1245	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1246	}
		1247
		1248	void
		1249	aio_nop (callback=&PL_sv_undef)
		1250	SV * callback
		1251	PPCODE:
		1252	{
		1253	dREQ;
		1254
		1255	req->type = REQ_NOP;
		1256
		1257	REQ_SEND;
		1258	}
		1259
		1260	#if 0
		1261
		1262	void
		1263	aio_pri (int pri = DEFAULT_PRI)
559	CODE:	1264	CODE:
560	{	1265	if (pri > PRI_MIN) pri = PRI_MIN;
561	aio_req req;	1266	if (pri < PRI_MAX) pri = PRI_MAX;
562		1267	next_pri = pri + PRI_BIAS;
563	Newz (0, req, 1, aio_cb);
564
565	if (!req)
566	croak ("out of memory during aio_req allocation");
567
568	req->type = REQ_UNLINK;
569	req->data = newSVsv (pathname);
570	req->dataptr = SvPV_nolen (req->data);
571	req->callback = SvREFCNT_inc (callback);
572
573	send_req (req);
574	}
575		1268
		1269	#endif
		1270
576	void	1271	void
577	flush()	1272	flush ()
578	PROTOTYPE:	1273	PROTOTYPE:
579	CODE:	1274	CODE:
580	while (nreqs)	1275	while (nreqs)
581	{	1276	{
582	poll_wait ();	1277	poll_wait ();
…		…
622	CODE:	1317	CODE:
623	RETVAL = nreqs;	1318	RETVAL = nreqs;
624	OUTPUT:	1319	OUTPUT:
625	RETVAL	1320	RETVAL
626		1321
		1322	PROTOTYPES: DISABLE
		1323
		1324	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1325
		1326	void
		1327	cancel (aio_req_ornot req)
		1328	PROTOTYPE:
		1329	CODE:
		1330	req_cancel (req);
		1331
		1332	void
		1333	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1334	CODE:
		1335	SvREFCNT_dec (req->callback);
		1336	req->callback = newSVsv (callback);
		1337
		1338	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1339
		1340	void
		1341	add (aio_req grp, ...)
		1342	PPCODE:
		1343	{
		1344	int i;
		1345	aio_req req;
		1346
		1347	if (grp->fd == 2)
		1348	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1349
		1350	for (i = 1; i < items; ++i )
		1351	{
		1352	if (GIMME_V != G_VOID)
		1353	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1354
		1355	req = SvAIO_REQ (ST (i));
		1356
		1357	if (req)
		1358	{
		1359	++grp->length;
		1360	req->grp = grp;
		1361
		1362	req->grp_prev = 0;
		1363	req->grp_next = grp->grp_first;
		1364
		1365	if (grp->grp_first)
		1366	grp->grp_first->grp_prev = req;
		1367
		1368	grp->grp_first = req;
		1369	}
		1370	}
		1371	}
		1372
		1373	void
		1374	result (aio_req grp, ...)
		1375	CODE:
		1376	{
		1377	int i;
		1378	AV *av = newAV ();
		1379
		1380	for (i = 1; i < items; ++i )
		1381	av_push (av, newSVsv (ST (i)));
		1382
		1383	SvREFCNT_dec (grp->data);
		1384	grp->data = (SV *)av;
		1385	}
		1386
		1387	void
		1388	feed_limit (aio_req grp, int limit)
		1389	CODE:
		1390	grp->fd2 = limit;
		1391	aio_grp_feed (grp);
		1392
		1393	void
		1394	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1395	CODE:
		1396	{
		1397	SvREFCNT_dec (grp->fh2);
		1398	grp->fh2 = newSVsv (callback);
		1399
		1400	if (grp->fd2 <= 0)
		1401	grp->fd2 = 2;
		1402
		1403	aio_grp_feed (grp);
		1404	}
		1405

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