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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 1.62 by root, Mon Oct 23 22:45:18 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	{
73	fd_set rfd;	196	fd_set rfd;
		197
		198	while (nreqs)
		199	{
		200	aio_req req;
		201	pthread_mutex_lock (&reslock);
		202	req = ress;
		203	pthread_mutex_unlock (&reslock);
		204
		205	if (req)
		206	return;
		207
74	FD_ZERO(&rfd);	208	FD_ZERO(&rfd);
75	FD_SET(respipe [0], &rfd);	209	FD_SET(respipe [0], &rfd);
76		210
77	select (respipe [0] + 1, &rfd, 0, 0, 0);	211	select (respipe [0] + 1, &rfd, 0, 0, 0);
78	}	212	}
79	}	213	}
80		214
81	static int	215	static void req_invoke (aio_req req)
82	poll_cb ()	216	{
		217	dSP;
		218	int errorno = errno;
		219
		220	if (req->flags & FLAG_CANCELLED || !SvOK (req->callback))
		221	return;
		222
		223	errno = req->errorno;
		224
		225	ENTER;
		226	SAVETMPS;
		227	PUSHMARK (SP);
		228	EXTEND (SP, 1);
		229
		230	switch (req->type)
		231	{
		232	case REQ_READDIR:
		233	{
		234	SV *rv = &PL_sv_undef;
		235
		236	if (req->result >= 0)
		237	{
		238	char *buf = req->data2ptr;
		239	AV *av = newAV ();
		240
		241	while (req->result)
		242	{
		243	SV *sv = newSVpv (buf, 0);
		244
		245	av_push (av, sv);
		246	buf += SvCUR (sv) + 1;
		247	req->result--;
		248	}
		249
		250	rv = sv_2mortal (newRV_noinc ((SV *)av));
		251	}
		252
		253	PUSHs (rv);
		254	}
		255	break;
		256
		257	case REQ_OPEN:
		258	{
		259	/* convert fd to fh */
		260	SV *fh;
		261
		262	PUSHs (sv_2mortal (newSViv (req->result)));
		263	PUTBACK;
		264	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		265	SPAGAIN;
		266
		267	fh = SvREFCNT_inc (POPs);
		268
		269	PUSHMARK (SP);
		270	XPUSHs (sv_2mortal (fh));
		271	}
		272	break;
		273
		274	case REQ_GROUP:
		275	req->fd = 2; /* mark group as finished */
		276
		277	if (req->data)
		278	{
		279	int i;
		280	AV *av = (AV *)req->data;
		281
		282	EXTEND (SP, AvFILL (av) + 1);
		283	for (i = 0; i <= AvFILL (av); ++i)
		284	PUSHs (*av_fetch (av, i, 0));
		285	}
		286	break;
		287
		288	case REQ_NOP:
		289	case REQ_SLEEP:
		290	break;
		291
		292	default:
		293	PUSHs (sv_2mortal (newSViv (req->result)));
		294	break;
		295	}
		296
		297
		298	PUTBACK;
		299	call_sv (req->callback, G_VOID | G_EVAL);
		300	SPAGAIN;
		301
		302	FREETMPS;
		303	LEAVE;
		304
		305	errno = errorno;
		306
		307	if (SvTRUE (ERRSV))
		308	{
		309	req_free (req);
		310	croak (0);
		311	}
		312	}
		313
		314	static void req_free (aio_req req)
		315	{
		316	if (req->grp)
		317	{
		318	aio_req grp = req->grp;
		319
		320	/* unlink request */
		321	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		322	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		323
		324	if (grp->grp_first == req)
		325	grp->grp_first = req->grp_next;
		326
		327	aio_grp_dec (grp);
		328	}
		329
		330	if (req->self)
		331	{
		332	sv_unmagic (req->self, PERL_MAGIC_ext);
		333	SvREFCNT_dec (req->self);
		334	}
		335
		336	SvREFCNT_dec (req->data);
		337	SvREFCNT_dec (req->fh);
		338	SvREFCNT_dec (req->fh2);
		339	SvREFCNT_dec (req->callback);
		340	Safefree (req->statdata);
		341
		342	if (req->type == REQ_READDIR && req->result >= 0)
		343	free (req->data2ptr);
		344
		345	Safefree (req);
		346	}
		347
		348	static void req_cancel (aio_req req)
		349	{
		350	req->flags |= FLAG_CANCELLED;
		351
		352	if (req->type == REQ_GROUP)
		353	{
		354	aio_req sub;
		355
		356	for (sub = req->grp_first; sub; sub = sub->grp_next)
		357	req_cancel (sub);
		358	}
		359	}
		360
		361	static int poll_cb ()
83	{	362	{
84	dSP;	363	dSP;
85	int count = 0;	364	int count = 0;
		365	int do_croak = 0;
86	aio_req req, prv;	366	aio_req req;
87		367
		368	for (;;)
		369	{
88	pthread_mutex_lock (&reslock);	370	pthread_mutex_lock (&reslock);
		371	req = ress;
89		372
90	{	373	if (req)
		374	{
		375	ress = req->next;
		376
		377	if (!ress)
		378	{
91	/* read any signals sent by the worker threads */	379	/* read any signals sent by the worker threads */
92	char buf [32];	380	char buf [32];
93	while (read (respipe [0], buf, 32) > 0)	381	while (read (respipe [0], buf, 32) == 32)
		382	;
		383
		384	rese = 0;
		385	}
94	;	386	}
95	}
96		387
97	req = ress;
98	ress = rese = 0;
99
100	pthread_mutex_unlock (&reslock);	388	pthread_mutex_unlock (&reslock);
101		389
102	while (req)	390	if (!req)
103	{	391	break;
		392
104	nreqs--;	393	--nreqs;
105		394
106	if (req->type == REQ_QUIT)	395	if (req->type == REQ_QUIT)
107	started--;	396	started--;
		397	else if (req->type == REQ_GROUP && req->length)
		398	{
		399	req->fd = 1; /* mark request as delayed */
		400	continue;
		401	}
108	else	402	else
109	{	403	{
110	int errorno = errno;
111	errno = req->errorno;
112
113	if (req->type == REQ_READ)	404	if (req->type == REQ_READ)
114	SvCUR_set (req->data, req->dataoffset	405	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
115	+ req->result > 0 ? req->result : 0);
116		406
		407	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		408	SvREADONLY_off (req->data);
		409
117	if (req->data)	410	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	{	411	{
125	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	412	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
126	PL_laststatval = req->result;	413	PL_laststatval = req->result;
127	PL_statcache = *(req->statdata);	414	PL_statcache = *(req->statdata);
128
129	Safefree (req->statdata);
130	}	415	}
131		416
132	ENTER;	417	req_invoke (req);
133	PUSHMARK (SP);
134	XPUSHs (sv_2mortal (newSViv (req->result)));
135		418
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++;	419	count++;
165	}	420	}
166		421
167	prv = req;
168	req = req->next;
169	Safefree (prv);	422	req_free (req);
170
171	/* TODO: croak on errors? */
172	}	423	}
173		424
174	return count;	425	return count;
175	}	426	}
176		427
177	static void *aio_proc(void *arg);	428	static void *aio_proc(void *arg);
178		429
179	static void
180	start_thread (void)	430	static void start_thread (void)
181	{	431	{
182	sigset_t fullsigset, oldsigset;	432	sigset_t fullsigset, oldsigset;
183	pthread_t tid;	433	pthread_t tid;
184	pthread_attr_t attr;	434	pthread_attr_t attr;
185		435
…		…
194	started++;	444	started++;
195		445
196	sigprocmask (SIG_SETMASK, &oldsigset, 0);	446	sigprocmask (SIG_SETMASK, &oldsigset, 0);
197	}	447	}
198		448
199	static void	449	static void req_send (aio_req req)
200	send_req (aio_req req)
201	{	450	{
		451	while (started < wanted && nreqs >= started)
		452	start_thread ();
		453
202	nreqs++;	454	++nreqs;
203		455
204	pthread_mutex_lock (&reqlock);	456	pthread_mutex_lock (&reqlock);
205		457
206	req->next = 0;	458	req->next = 0;
207		459
…		…
214	reqe = reqs = req;	466	reqe = reqs = req;
215		467
216	pthread_cond_signal (&reqwait);	468	pthread_cond_signal (&reqwait);
217	pthread_mutex_unlock (&reqlock);	469	pthread_mutex_unlock (&reqlock);
218		470
219	while (nreqs > max_outstanding)	471	if (nreqs > max_outstanding)
		472	for (;;)
		473	{
		474	poll_cb ();
		475
		476	if (nreqs <= max_outstanding)
		477	break;
		478
		479	poll_wait ();
		480	}
		481	}
		482
		483	static void end_thread (void)
		484	{
		485	aio_req req;
		486	Newz (0, req, 1, aio_cb);
		487	req->type = REQ_QUIT;
		488
		489	req_send (req);
		490	}
		491
		492	static void min_parallel (int nthreads)
		493	{
		494	if (wanted < nthreads)
		495	wanted = nthreads;
		496	}
		497
		498	static void max_parallel (int nthreads)
		499	{
		500	int cur = started;
		501
		502	if (wanted > nthreads)
		503	wanted = nthreads;
		504
		505	while (cur > wanted)
		506	{
		507	end_thread ();
		508	cur--;
		509	}
		510
		511	while (started > wanted)
220	{	512	{
221	poll_wait ();	513	poll_wait ();
222	poll_cb ();	514	poll_cb ();
223	}	515	}
224	}	516	}
225		517
226	static void	518	static void create_pipe ()
227	end_thread (void)
228	{	519	{
229	aio_req req;	520	if (pipe (respipe))
230	New (0, req, 1, aio_cb);	521	croak ("unable to initialize result pipe");
231	req->type = REQ_QUIT;
232		522
233	send_req (req);	523	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
234	}	524	croak ("cannot set result pipe to nonblocking mode");
235		525
236	static void *	526	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		527	croak ("cannot set result pipe to nonblocking mode");
		528	}
		529
		530	/*****************************************************************************/
		531	/* work around various missing functions */
		532
		533	#if !HAVE_PREADWRITE
		534	# define pread aio_pread
		535	# define pwrite aio_pwrite
		536
		537	/*
		538	* make our pread/pwrite safe against themselves, but not against
		539	* normal read/write by using a mutex. slows down execution a lot,
		540	* but that's your problem, not mine.
		541	*/
		542	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
		543
		544	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		545	{
		546	ssize_t res;
		547	off_t ooffset;
		548
		549	pthread_mutex_lock (&preadwritelock);
		550	ooffset = lseek (fd, 0, SEEK_CUR);
		551	lseek (fd, offset, SEEK_SET);
		552	res = read (fd, buf, count);
		553	lseek (fd, ooffset, SEEK_SET);
		554	pthread_mutex_unlock (&preadwritelock);
		555
		556	return res;
		557	}
		558
		559	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		560	{
		561	ssize_t res;
		562	off_t ooffset;
		563
		564	pthread_mutex_lock (&preadwritelock);
		565	ooffset = lseek (fd, 0, SEEK_CUR);
		566	lseek (fd, offset, SEEK_SET);
		567	res = write (fd, buf, count);
		568	lseek (fd, offset, SEEK_SET);
		569	pthread_mutex_unlock (&preadwritelock);
		570
		571	return res;
		572	}
		573	#endif
		574
		575	#if !HAVE_FDATASYNC
		576	# define fdatasync fsync
		577	#endif
		578
		579	#if !HAVE_READAHEAD
		580	# define readahead aio_readahead
		581
		582	static ssize_t readahead (int fd, off_t offset, size_t count)
		583	{
		584	char readahead_buf[4096];
		585
		586	while (count > 0)
		587	{
		588	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
		589
		590	pread (fd, readahead_buf, len, offset);
		591	offset += len;
		592	count -= len;
		593	}
		594
		595	errno = 0;
		596	}
		597	#endif
		598
		599	#if !HAVE_READDIR_R
		600	# define readdir_r aio_readdir_r
		601
		602	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		603
		604	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		605	{
		606	struct dirent *e;
		607	int errorno;
		608
		609	pthread_mutex_lock (&readdirlock);
		610
		611	e = readdir (dirp);
		612	errorno = errno;
		613
		614	if (e)
		615	{
		616	*res = ent;
		617	strcpy (ent->d_name, e->d_name);
		618	}
		619	else
		620	*res = 0;
		621
		622	pthread_mutex_unlock (&readdirlock);
		623
		624	errno = errorno;
		625	return e ? 0 : -1;
		626	}
		627	#endif
		628
		629	/* sendfile always needs emulation */
		630	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
		631	{
		632	ssize_t res;
		633
		634	if (!count)
		635	return 0;
		636
		637	#if HAVE_SENDFILE
		638	# if __linux
		639	res = sendfile (ofd, ifd, &offset, count);
		640
		641	# elif __freebsd
		642	/*
		643	* Of course, the freebsd sendfile is a dire hack with no thoughts
		644	* wasted on making it similar to other I/O functions.
		645	*/
		646	{
		647	off_t sbytes;
		648	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		649
		650	if (res < 0 && sbytes)
		651	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
		652	res = sbytes;
		653	}
		654
		655	# elif __hpux
		656	res = sendfile (ofd, ifd, offset, count, 0, 0);
		657
		658	# elif __solaris
		659	{
		660	struct sendfilevec vec;
		661	size_t sbytes;
		662
		663	vec.sfv_fd = ifd;
		664	vec.sfv_flag = 0;
		665	vec.sfv_off = offset;
		666	vec.sfv_len = count;
		667
		668	res = sendfilev (ofd, &vec, 1, &sbytes);
		669
		670	if (res < 0 && sbytes)
		671	res = sbytes;
		672	}
		673
		674	# endif
		675	#else
		676	res = -1;
		677	errno = ENOSYS;
		678	#endif
		679
		680	if (res < 0
		681	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		682	#if __solaris
		683	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		684	#endif
		685	)
		686	)
		687	{
		688	/* emulate sendfile. this is a major pain in the ass */
		689	char buf[4096];
		690	res = 0;
		691
		692	while (count)
		693	{
		694	ssize_t cnt;
		695
		696	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
		697
		698	if (cnt <= 0)
		699	{
		700	if (cnt && !res) res = -1;
		701	break;
		702	}
		703
		704	cnt = write (ofd, buf, cnt);
		705
		706	if (cnt <= 0)
		707	{
		708	if (cnt && !res) res = -1;
		709	break;
		710	}
		711
		712	offset += cnt;
		713	res += cnt;
		714	count -= cnt;
		715	}
		716	}
		717
		718	return res;
		719	}
		720
		721	/* read a full directory */
		722	static int scandir_ (const char *path, void **namesp)
		723	{
		724	DIR *dirp = opendir (path);
		725	union
		726	{
		727	struct dirent d;
		728	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		729	} u;
		730	struct dirent *entp;
		731	char *name, *names;
		732	int memlen = 4096;
		733	int memofs = 0;
		734	int res = 0;
		735	int errorno;
		736
		737	if (!dirp)
		738	return -1;
		739
		740	names = malloc (memlen);
		741
		742	for (;;)
		743	{
		744	errno = 0, readdir_r (dirp, &u.d, &entp);
		745
		746	if (!entp)
		747	break;
		748
		749	name = entp->d_name;
		750
		751	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		752	{
		753	int len = strlen (name) + 1;
		754
		755	res++;
		756
		757	while (memofs + len > memlen)
		758	{
		759	memlen *= 2;
		760	names = realloc (names, memlen);
		761	if (!names)
		762	break;
		763	}
		764
		765	memcpy (names + memofs, name, len);
		766	memofs += len;
		767	}
		768	}
		769
		770	errorno = errno;
		771	closedir (dirp);
		772
		773	if (errorno)
		774	{
		775	free (names);
		776	errno = errorno;
		777	res = -1;
		778	}
		779
		780	*namesp = (void *)names;
		781	return res;
		782	}
		783
		784	/*****************************************************************************/
		785
237	aio_proc (void *thr_arg)	786	static void *aio_proc (void *thr_arg)
238	{	787	{
239	aio_req req;	788	aio_req req;
240	int type;	789	int type;
241		790
242	do	791	do
…		…
260	}	809	}
261		810
262	pthread_mutex_unlock (&reqlock);	811	pthread_mutex_unlock (&reqlock);
263		812
264	errno = 0; /* strictly unnecessary */	813	errno = 0; /* strictly unnecessary */
		814	type = req->type; /* remember type for QUIT check */
265		815
266	type = req->type;	816	if (!(req->flags & FLAG_CANCELLED))
267
268	switch (type)	817	switch (type)
269	{	818	{
270	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	819	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;	820	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
272	#if SYS_readahead	821
273	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	822	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
274	#else	823	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		824
278	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	825	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
279	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	826	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
280	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	827	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
281		828
282	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	829	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
283	case REQ_CLOSE: req->result = close (req->fd); break;	830	case REQ_CLOSE: req->result = close (req->fd); break;
284	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	831	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
285
286	case REQ_FSYNC: req->result = fsync (req->fd); break;	832	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		833	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		834	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
		835	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
		836
287	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	837	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
		838	case REQ_FSYNC: req->result = fsync (req->fd); break;
		839	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
288		840
		841	case REQ_SLEEP:
		842	{
		843	struct timeval tv;
		844
		845	tv.tv_sec = req->fd;
		846	tv.tv_usec = req->fd2;
		847
		848	req->result = select (0, 0, 0, 0, &tv);
		849	}
		850
		851	case REQ_GROUP:
		852	case REQ_NOP:
289	case REQ_QUIT:	853	case REQ_QUIT:
290	break;	854	break;
291		855
292	default:	856	default:
293	req->result = ENOSYS;	857	req->result = ENOSYS;
294	break;	858	break;
295	}	859	}
296		860
297	req->errorno = errno;	861	req->errorno = errno;
298		862
299	pthread_mutex_lock (&reslock);	863	pthread_mutex_lock (&reslock);
300		864
…		…
318	while (type != REQ_QUIT);	882	while (type != REQ_QUIT);
319		883
320	return 0;	884	return 0;
321	}	885	}
322		886
		887	/*****************************************************************************/
		888
		889	static void atfork_prepare (void)
		890	{
		891	pthread_mutex_lock (&reqlock);
		892	pthread_mutex_lock (&reslock);
		893	#if !HAVE_PREADWRITE
		894	pthread_mutex_lock (&preadwritelock);
		895	#endif
		896	#if !HAVE_READDIR_R
		897	pthread_mutex_lock (&readdirlock);
		898	#endif
		899	}
		900
		901	static void atfork_parent (void)
		902	{
		903	#if !HAVE_READDIR_R
		904	pthread_mutex_unlock (&readdirlock);
		905	#endif
		906	#if !HAVE_PREADWRITE
		907	pthread_mutex_unlock (&preadwritelock);
		908	#endif
		909	pthread_mutex_unlock (&reslock);
		910	pthread_mutex_unlock (&reqlock);
		911	}
		912
		913	static void atfork_child (void)
		914	{
		915	aio_req prv;
		916
		917	started = 0;
		918
		919	while (reqs)
		920	{
		921	prv = reqs;
		922	reqs = prv->next;
		923	req_free (prv);
		924	}
		925
		926	reqs = reqe = 0;
		927
		928	while (ress)
		929	{
		930	prv = ress;
		931	ress = prv->next;
		932	req_free (prv);
		933	}
		934
		935	ress = rese = 0;
		936
		937	close (respipe [0]);
		938	close (respipe [1]);
		939	create_pipe ();
		940
		941	atfork_parent ();
		942	}
		943
		944	#define dREQ \
		945	aio_req req; \
		946	int req_pri = next_pri; \
		947	next_pri = DEFAULT_PRI + PRI_BIAS; \
		948	\
		949	if (SvOK (callback) && !SvROK (callback)) \
		950	croak ("callback must be undef or of reference type"); \
		951	\
		952	Newz (0, req, 1, aio_cb); \
		953	if (!req) \
		954	croak ("out of memory during aio_req allocation"); \
		955	\
		956	req->callback = newSVsv (callback); \
		957	req->pri = req_pri
		958
		959	#define REQ_SEND \
		960	req_send (req); \
		961	\
		962	if (GIMME_V != G_VOID) \
		963	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		964
323	MODULE = IO::AIO PACKAGE = IO::AIO	965	MODULE = IO::AIO PACKAGE = IO::AIO
324		966
325	PROTOTYPES: ENABLE	967	PROTOTYPES: ENABLE
326		968
327	BOOT:	969	BOOT:
328	{	970	{
329	if (pipe (respipe))	971	HV *stash = gv_stashpv ("IO::AIO", 1);
330	croak ("unable to initialize result pipe");	972	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		973	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		974	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
331		975
332	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	976	create_pipe ();
333	croak ("cannot set result pipe to nonblocking mode");	977	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	}	978	}
338		979
339	void	980	void
340	min_parallel(nthreads)	981	min_parallel (nthreads)
341	int nthreads	982	int nthreads
342	PROTOTYPE: $	983	PROTOTYPE: $
343	CODE:
344	while (nthreads > started)
345	start_thread ();
346		984
347	void	985	void
348	max_parallel(nthreads)	986	max_parallel (nthreads)
349	int nthreads	987	int nthreads
350	PROTOTYPE: $	988	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		989
367	int	990	int
368	max_outstanding(nreqs)	991	max_outstanding (nreqs)
369	int nreqs	992	int nreqs
370	PROTOTYPE: $	993	PROTOTYPE: $
371	CODE:	994	CODE:
372	RETVAL = max_outstanding;	995	RETVAL = max_outstanding;
373	max_outstanding = nreqs;	996	max_outstanding = nreqs;
374		997
375	void	998	void
376	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	999	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
377	SV * pathname	1000	SV * pathname
378	int flags	1001	int flags
379	int mode	1002	int mode
380	SV * callback	1003	SV * callback
381	PROTOTYPE: $$$;$	1004	PROTOTYPE: $$$;$
382	CODE:	1005	PPCODE:
383	{	1006	{
384	aio_req req;	1007	dREQ;
385
386	Newz (0, req, 1, aio_cb);
387
388	if (!req)
389	croak ("out of memory during aio_req allocation");
390		1008
391	req->type = REQ_OPEN;	1009	req->type = REQ_OPEN;
392	req->data = newSVsv (pathname);	1010	req->data = newSVsv (pathname);
393	req->dataptr = SvPV_nolen (req->data);	1011	req->dataptr = SvPVbyte_nolen (req->data);
394	req->fd = flags;	1012	req->fd = flags;
395	req->mode = mode;	1013	req->mode = mode;
396	req->callback = SvREFCNT_inc (callback);
397		1014
398	send_req (req);	1015	REQ_SEND;
399	}	1016	}
400		1017
401	void	1018	void
402	aio_close(fh,callback=&PL_sv_undef)	1019	aio_close (fh,callback=&PL_sv_undef)
403	SV * fh	1020	SV * fh
404	SV * callback	1021	SV * callback
405	PROTOTYPE: $;$	1022	PROTOTYPE: $;$
406	ALIAS:	1023	ALIAS:
407	aio_close = REQ_CLOSE	1024	aio_close = REQ_CLOSE
408	aio_fsync = REQ_FSYNC	1025	aio_fsync = REQ_FSYNC
409	aio_fdatasync = REQ_FDATASYNC	1026	aio_fdatasync = REQ_FDATASYNC
410	CODE:	1027	PPCODE:
411	{	1028	{
412	aio_req req;	1029	dREQ;
413
414	Newz (0, req, 1, aio_cb);
415
416	if (!req)
417	croak ("out of memory during aio_req allocation");
418		1030
419	req->type = ix;	1031	req->type = ix;
420	req->fh = newSVsv (fh);	1032	req->fh = newSVsv (fh);
421	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1033	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
422	req->callback = SvREFCNT_inc (callback);
423		1034
424	send_req (req);	1035	REQ_SEND (req);
425	}	1036	}
426		1037
427	void	1038	void
428	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1039	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
429	SV * fh	1040	SV * fh
430	UV offset	1041	UV offset
431	IV length	1042	UV length
432	SV * data	1043	SV * data
433	IV dataoffset	1044	UV dataoffset
434	SV * callback	1045	SV * callback
435	ALIAS:	1046	ALIAS:
436	aio_read = REQ_READ	1047	aio_read = REQ_READ
437	aio_write = REQ_WRITE	1048	aio_write = REQ_WRITE
438	PROTOTYPE: $$$$$;$	1049	PROTOTYPE: $$$$$;$
439	CODE:	1050	PPCODE:
440	{	1051	{
441	aio_req req;	1052	aio_req req;
442	STRLEN svlen;	1053	STRLEN svlen;
443	char *svptr = SvPV (data, svlen);	1054	char *svptr = SvPVbyte (data, svlen);
444		1055
445	SvUPGRADE (data, SVt_PV);	1056	SvUPGRADE (data, SVt_PV);
446	SvPOK_on (data);	1057	SvPOK_on (data);
447		1058
448	if (dataoffset < 0)	1059	if (dataoffset < 0)
…		…
464	}	1075	}
465		1076
466	if (length < 0)	1077	if (length < 0)
467	croak ("length must not be negative");	1078	croak ("length must not be negative");
468		1079
469	Newz (0, req, 1, aio_cb);	1080	{
		1081	dREQ;
470		1082
471	if (!req)
472	croak ("out of memory during aio_req allocation");
473
474	req->type = ix;	1083	req->type = ix;
475	req->fh = newSVsv (fh);	1084	req->fh = newSVsv (fh);
476	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1085	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
477	: IoOFP (sv_2io (fh)));	1086	: IoOFP (sv_2io (fh)));
478	req->offset = offset;	1087	req->offset = offset;
		1088	req->length = length;
		1089	req->data = SvREFCNT_inc (data);
		1090	req->dataptr = (char *)svptr + dataoffset;
		1091
		1092	if (!SvREADONLY (data))
		1093	{
		1094	SvREADONLY_on (data);
		1095	req->data2ptr = (void *)data;
		1096	}
		1097
		1098	REQ_SEND;
		1099	}
		1100	}
		1101
		1102	void
		1103	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1104	SV * out_fh
		1105	SV * in_fh
		1106	UV in_offset
		1107	UV length
		1108	SV * callback
		1109	PROTOTYPE: $$$$;$
		1110	PPCODE:
		1111	{
		1112	dREQ;
		1113
		1114	req->type = REQ_SENDFILE;
		1115	req->fh = newSVsv (out_fh);
		1116	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1117	req->fh2 = newSVsv (in_fh);
		1118	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1119	req->offset = in_offset;
479	req->length = length;	1120	req->length = length;
480	req->data = SvREFCNT_inc (data);
481	req->dataptr = (char *)svptr + dataoffset;
482	req->callback = SvREFCNT_inc (callback);
483		1121
484	send_req (req);	1122	REQ_SEND;
485	}	1123	}
486		1124
487	void	1125	void
488	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1126	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
489	SV * fh	1127	SV * fh
490	UV offset	1128	UV offset
491	IV length	1129	IV length
492	SV * callback	1130	SV * callback
493	PROTOTYPE: $$$;$	1131	PROTOTYPE: $$$;$
494	CODE:	1132	PPCODE:
495	{	1133	{
496	aio_req req;	1134	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		1135
506	req->type = REQ_READAHEAD;	1136	req->type = REQ_READAHEAD;
507	req->fh = newSVsv (fh);	1137	req->fh = newSVsv (fh);
508	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1138	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
509	req->offset = offset;	1139	req->offset = offset;
510	req->length = length;	1140	req->length = length;
511	req->callback = SvREFCNT_inc (callback);
512		1141
513	send_req (req);	1142	REQ_SEND;
514	}	1143	}
515		1144
516	void	1145	void
517	aio_stat(fh_or_path,callback=&PL_sv_undef)	1146	aio_stat (fh_or_path,callback=&PL_sv_undef)
518	SV * fh_or_path	1147	SV * fh_or_path
519	SV * callback	1148	SV * callback
520	ALIAS:	1149	ALIAS:
521	aio_stat = REQ_STAT	1150	aio_stat = REQ_STAT
522	aio_lstat = REQ_LSTAT	1151	aio_lstat = REQ_LSTAT
523	CODE:	1152	PPCODE:
524	{	1153	{
525	aio_req req;	1154	dREQ;
526
527	Newz (0, req, 1, aio_cb);
528
529	if (!req)
530	croak ("out of memory during aio_req allocation");
531		1155
532	New (0, req->statdata, 1, Stat_t);	1156	New (0, req->statdata, 1, Stat_t);
533
534	if (!req->statdata)	1157	if (!req->statdata)
		1158	{
		1159	req_free (req);
535	croak ("out of memory during aio_req->statdata allocation");	1160	croak ("out of memory during aio_req->statdata allocation");
		1161	}
536		1162
537	if (SvPOK (fh_or_path))	1163	if (SvPOK (fh_or_path))
538	{	1164	{
539	req->type = ix;	1165	req->type = ix;
540	req->data = newSVsv (fh_or_path);	1166	req->data = newSVsv (fh_or_path);
541	req->dataptr = SvPV_nolen (req->data);	1167	req->dataptr = SvPVbyte_nolen (req->data);
542	}	1168	}
543	else	1169	else
544	{	1170	{
545	req->type = REQ_FSTAT;	1171	req->type = REQ_FSTAT;
546	req->fh = newSVsv (fh_or_path);	1172	req->fh = newSVsv (fh_or_path);
547	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1173	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
548	}	1174	}
549		1175
550	req->callback = SvREFCNT_inc (callback);	1176	REQ_SEND;
551
552	send_req (req);
553	}	1177	}
554		1178
555	void	1179	void
556	aio_unlink(pathname,callback=&PL_sv_undef)	1180	aio_unlink (pathname,callback=&PL_sv_undef)
557	SV * pathname	1181	SV * pathname
558	SV * callback	1182	SV * callback
		1183	ALIAS:
		1184	aio_unlink = REQ_UNLINK
		1185	aio_rmdir = REQ_RMDIR
		1186	aio_readdir = REQ_READDIR
		1187	PPCODE:
		1188	{
		1189	dREQ;
		1190
		1191	req->type = ix;
		1192	req->data = newSVsv (pathname);
		1193	req->dataptr = SvPVbyte_nolen (req->data);
		1194
		1195	REQ_SEND;
		1196	}
		1197
		1198	void
		1199	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1200	SV * oldpath
		1201	SV * newpath
		1202	SV * callback
		1203	ALIAS:
		1204	aio_link = REQ_LINK
		1205	aio_symlink = REQ_SYMLINK
		1206	aio_rename = REQ_RENAME
		1207	PPCODE:
		1208	{
		1209	dREQ;
		1210
		1211	req->type = ix;
		1212	req->fh = newSVsv (oldpath);
		1213	req->data2ptr = SvPVbyte_nolen (req->fh);
		1214	req->data = newSVsv (newpath);
		1215	req->dataptr = SvPVbyte_nolen (req->data);
		1216
		1217	REQ_SEND;
		1218	}
		1219
		1220	void
		1221	aio_sleep (delay,callback=&PL_sv_undef)
		1222	double delay
		1223	SV * callback
		1224	PPCODE:
		1225	{
		1226	dREQ;
		1227
		1228	req->type = REQ_SLEEP;
		1229	req->fd = delay < 0. ? 0 : delay;
		1230	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1231
		1232	REQ_SEND;
		1233	}
		1234
		1235	void
		1236	aio_group (callback=&PL_sv_undef)
		1237	SV * callback
		1238	PROTOTYPE: ;$
		1239	PPCODE:
		1240	{
		1241	dREQ;
		1242
		1243	req->type = REQ_GROUP;
		1244	req_send (req);
		1245
		1246	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1247	}
		1248
		1249	void
		1250	aio_nop (callback=&PL_sv_undef)
		1251	SV * callback
		1252	PPCODE:
		1253	{
		1254	dREQ;
		1255
		1256	req->type = REQ_NOP;
		1257
		1258	REQ_SEND;
		1259	}
		1260
		1261	#if 0
		1262
		1263	void
		1264	aio_pri (int pri = DEFAULT_PRI)
559	CODE:	1265	CODE:
560	{	1266	if (pri < PRI_MIN) pri = PRI_MIN;
561	aio_req req;	1267	if (pri > PRI_MAX) pri = PRI_MAX;
562		1268	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		1269
		1270	#endif
		1271
576	void	1272	void
577	flush()	1273	flush ()
578	PROTOTYPE:	1274	PROTOTYPE:
579	CODE:	1275	CODE:
580	while (nreqs)	1276	while (nreqs)
581	{	1277	{
582	poll_wait ();	1278	poll_wait ();
…		…
622	CODE:	1318	CODE:
623	RETVAL = nreqs;	1319	RETVAL = nreqs;
624	OUTPUT:	1320	OUTPUT:
625	RETVAL	1321	RETVAL
626		1322
		1323	PROTOTYPES: DISABLE
		1324
		1325	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1326
		1327	void
		1328	cancel (aio_req_ornot req)
		1329	PROTOTYPE:
		1330	CODE:
		1331	req_cancel (req);
		1332
		1333	void
		1334	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1335	CODE:
		1336	SvREFCNT_dec (req->callback);
		1337	req->callback = newSVsv (callback);
		1338
		1339	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1340
		1341	void
		1342	add (aio_req grp, ...)
		1343	PPCODE:
		1344	{
		1345	int i;
		1346	aio_req req;
		1347
		1348	if (grp->fd == 2)
		1349	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1350
		1351	for (i = 1; i < items; ++i )
		1352	{
		1353	if (GIMME_V != G_VOID)
		1354	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1355
		1356	req = SvAIO_REQ (ST (i));
		1357
		1358	if (req)
		1359	{
		1360	++grp->length;
		1361	req->grp = grp;
		1362
		1363	req->grp_prev = 0;
		1364	req->grp_next = grp->grp_first;
		1365
		1366	if (grp->grp_first)
		1367	grp->grp_first->grp_prev = req;
		1368
		1369	grp->grp_first = req;
		1370	}
		1371	}
		1372	}
		1373
		1374	void
		1375	result (aio_req grp, ...)
		1376	CODE:
		1377	{
		1378	int i;
		1379	AV *av = newAV ();
		1380
		1381	for (i = 1; i < items; ++i )
		1382	av_push (av, newSVsv (ST (i)));
		1383
		1384	SvREFCNT_dec (grp->data);
		1385	grp->data = (SV *)av;
		1386	}
		1387
		1388	void
		1389	feed_limit (aio_req grp, int limit)
		1390	CODE:
		1391	grp->fd2 = limit;
		1392	aio_grp_feed (grp);
		1393
		1394	void
		1395	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1396	CODE:
		1397	{
		1398	SvREFCNT_dec (grp->fh2);
		1399	grp->fh2 = newSVsv (callback);
		1400
		1401	if (grp->fd2 <= 0)
		1402	grp->fd2 = 2;
		1403
		1404	aio_grp_feed (grp);
		1405	}
		1406

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