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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.9 by root, Tue Jul 12 11:02:54 2005 UTC vs.
Revision 1.52 by root, Sun Oct 22 22:14:54 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>
		18	#include <limits.h>
7	#include <unistd.h>	19	#include <unistd.h>
8	#include <fcntl.h>	20	#include <fcntl.h>
9	#include <signal.h>	21	#include <signal.h>
10	#include <sched.h>	22	#include <sched.h>
11		23
12	#include <pthread.h>	24	#if HAVE_SENDFILE
		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
		37	#endif
14		38
15	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	39	/* used for struct dirent, AIX doesn't provide it */
16	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	40	#ifndef NAME_MAX
17	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	41	# define NAME_MAX 4096
		42	#endif
18		43
19	#if __ia64	44	#if __ia64
20	# define STACKSIZE 65536	45	# define STACKSIZE 65536
21	#else	46	#else
22	# define STACKSIZE 4096	47	# define STACKSIZE 8192
23	#endif	48	#endif
24		49
25	enum {	50	enum {
26	REQ_QUIT,	51	REQ_QUIT,
27	REQ_OPEN, REQ_CLOSE,	52	REQ_OPEN, REQ_CLOSE,
28	REQ_READ, REQ_WRITE, REQ_READAHEAD,	53	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		54	REQ_SENDFILE,
29	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
30	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_SLEEP,
		61	REQ_GROUP,
31	};	62	};
32		63
		64	#define AIO_REQ_KLASS "IO::AIO::REQ"
		65	#define AIO_GRP_KLASS "IO::AIO::GRP"
		66
33	typedef struct aio_cb {	67	typedef struct aio_cb
		68	{
34	struct aio_cb *volatile next;	69	struct aio_cb *volatile next;
35		70
36	int type;	71	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
37		72
38	int fd;	73	SV *self; /* the perl counterpart of this request, if any */
		74
		75	SV *data, *callback;
		76	SV *fh, *fh2;
		77	void *dataptr, *data2ptr;
		78	Stat_t *statdata;
39	off_t offset;	79	off_t offset;
40	size_t length;	80	size_t length;
41	ssize_t result;	81	ssize_t result;
		82
		83	int type;
		84	int fd, fd2;
		85	int errorno;
		86	STRLEN dataoffset;
42	mode_t mode; /* open */	87	mode_t mode; /* open */
43	int errorno;	88	unsigned char cancelled;
44	SV *data, *callback;
45	void *dataptr;
46	STRLEN dataoffset;
47
48	Stat_t *statdata;
49	} aio_cb;	89	} aio_cb;
50		90
51	typedef aio_cb *aio_req;	91	typedef aio_cb *aio_req;
		92	typedef aio_cb *aio_req_ornot;
52		93
53	static int started;	94	static int started, wanted;
54	static int nreqs;	95	static volatile int nreqs;
55	static int max_outstanding = 1<<30;	96	static int max_outstanding = 1<<30;
56	static int respipe [2];	97	static int respipe [2];
57		98
58	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	99	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
59	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	100	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
60	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	101	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
61		102
62	static volatile aio_req reqs, reqe; /* queue start, queue end */	103	static volatile aio_req reqs, reqe; /* queue start, queue end */
63	static volatile aio_req ress, rese; /* queue start, queue end */	104	static volatile aio_req ress, rese; /* queue start, queue end */
64		105
65	static void	106	static void req_invoke (aio_req req);
66	poll_wait ()	107	static void req_free (aio_req req);
		108
		109	/* must be called at most once */
		110	static SV *req_sv (aio_req req, const char *klass)
67	{	111	{
68	if (!nreqs)	112	if (!req->self)
		113	{
		114	req->self = (SV *)newHV ();
		115	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		116	}
		117
		118	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		119	}
		120
		121	static aio_req SvAIO_REQ (SV *sv)
		122	{
		123	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		124	croak ("object of class " AIO_REQ_KLASS " expected");
		125
		126	MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		127
		128	return mg ? (aio_req)mg->mg_ptr : 0;
		129	}
		130
		131	static void aio_grp_feed (aio_req grp)
		132	{
		133	while (grp->length < grp->fd2)
		134	{
		135	int old_len = grp->length;
		136
		137	if (grp->fh2 && SvOK (grp->fh2))
		138	{
		139	dSP;
		140
		141	ENTER;
		142	SAVETMPS;
		143	PUSHMARK (SP);
		144	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		145	PUTBACK;
		146	call_sv (grp->fh2, G_VOID | G_EVAL);
		147	SPAGAIN;
		148	FREETMPS;
		149	LEAVE;
		150	}
		151
		152	/* stop if no progress has been made */
		153	if (old_len == grp->length)
		154	{
		155	SvREFCNT_dec (grp->fh2);
		156	grp->fh2 = 0;
		157	break;
		158	}
		159	}
		160	}
		161
		162	static void aio_grp_dec (aio_req grp)
		163	{
		164	--grp->length;
		165
		166	/* call feeder, if applicable */
		167	aio_grp_feed (grp);
		168
		169	/* finish, if done */
		170	if (!grp->length && grp->fd)
		171	{
		172	req_invoke (grp);
		173	req_free (grp);
		174	}
		175	}
		176
		177	static void poll_wait ()
		178	{
		179	if (nreqs && !ress)
		180	{
		181	fd_set rfd;
		182	FD_ZERO(&rfd);
		183	FD_SET(respipe [0], &rfd);
		184
		185	select (respipe [0] + 1, &rfd, 0, 0, 0);
		186	}
		187	}
		188
		189	static void req_invoke (aio_req req)
		190	{
		191	dSP;
		192	int errorno = errno;
		193
		194	if (req->cancelled || !SvOK (req->callback))
69	return;	195	return;
70		196
71	fd_set rfd;	197	errno = req->errorno;
72	FD_ZERO(&rfd);
73	FD_SET(respipe [0], &rfd);
74		198
75	select (respipe [0] + 1, &rfd, 0, 0, 0);	199	ENTER;
76	}	200	SAVETMPS;
		201	PUSHMARK (SP);
		202	EXTEND (SP, 1);
77		203
78	static int	204	switch (req->type)
79	poll_cb ()	205	{
		206	case REQ_READDIR:
		207	{
		208	SV *rv = &PL_sv_undef;
		209
		210	if (req->result >= 0)
		211	{
		212	char *buf = req->data2ptr;
		213	AV *av = newAV ();
		214
		215	while (req->result)
		216	{
		217	SV *sv = newSVpv (buf, 0);
		218
		219	av_push (av, sv);
		220	buf += SvCUR (sv) + 1;
		221	req->result--;
		222	}
		223
		224	rv = sv_2mortal (newRV_noinc ((SV *)av));
		225	}
		226
		227	PUSHs (rv);
		228	}
		229	break;
		230
		231	case REQ_OPEN:
		232	{
		233	/* convert fd to fh */
		234	SV *fh;
		235
		236	PUSHs (sv_2mortal (newSViv (req->result)));
		237	PUTBACK;
		238	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		239	SPAGAIN;
		240
		241	fh = SvREFCNT_inc (POPs);
		242
		243	PUSHMARK (SP);
		244	XPUSHs (sv_2mortal (fh));
		245	}
		246	break;
		247
		248	case REQ_GROUP:
		249	req->fd = 2; /* mark group as finished */
		250
		251	if (req->data)
		252	{
		253	int i;
		254	AV *av = (AV *)req->data;
		255
		256	EXTEND (SP, AvFILL (av) + 1);
		257	for (i = 0; i <= AvFILL (av); ++i)
		258	PUSHs (*av_fetch (av, i, 0));
		259	}
		260	break;
		261
		262	case REQ_SLEEP:
		263	break;
		264
		265	default:
		266	PUSHs (sv_2mortal (newSViv (req->result)));
		267	break;
		268	}
		269
		270
		271	PUTBACK;
		272	call_sv (req->callback, G_VOID | G_EVAL);
		273	SPAGAIN;
		274
		275	FREETMPS;
		276	LEAVE;
		277
		278	errno = errorno;
		279
		280	if (SvTRUE (ERRSV))
		281	{
		282	req_free (req);
		283	croak (0);
		284	}
		285	}
		286
		287	static void req_free (aio_req req)
		288	{
		289	if (req->grp)
		290	{
		291	aio_req grp = req->grp;
		292
		293	/* unlink request */
		294	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		295	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		296
		297	if (grp->grp_first == req)
		298	grp->grp_first = req->grp_next;
		299
		300	aio_grp_dec (grp);
		301	}
		302
		303	if (req->self)
		304	{
		305	sv_unmagic (req->self, PERL_MAGIC_ext);
		306	SvREFCNT_dec (req->self);
		307	}
		308
		309	SvREFCNT_dec (req->data);
		310	SvREFCNT_dec (req->fh);
		311	SvREFCNT_dec (req->fh2);
		312	SvREFCNT_dec (req->callback);
		313	Safefree (req->statdata);
		314
		315	if (req->type == REQ_READDIR && req->result >= 0)
		316	free (req->data2ptr);
		317
		318	Safefree (req);
		319	}
		320
		321	static void req_cancel (aio_req req)
		322	{
		323	req->cancelled = 1;
		324
		325	if (req->type == REQ_GROUP)
		326	{
		327	aio_req sub;
		328
		329	for (sub = req->grp_first; sub; sub = sub->grp_next)
		330	req_cancel (sub);
		331	}
		332	}
		333
		334	static int poll_cb ()
80	{	335	{
81	dSP;	336	dSP;
82	int count = 0;	337	int count = 0;
		338	int do_croak = 0;
83	aio_req req;	339	aio_req req;
84
85	{
86	/* read and signals sent by the worker threads */
87	char buf [32];
88	while (read (respipe [0], buf, 32) > 0)
89	;
90	}
91		340
92	for (;;)	341	for (;;)
93	{	342	{
94	pthread_mutex_lock (&reslock);	343	pthread_mutex_lock (&reslock);
95
96	req = ress;	344	req = ress;
97		345
98	if (ress)	346	if (req)
99	{	347	{
100	ress = ress->next;	348	ress = req->next;
		349
101	if (!ress) rese = 0;	350	if (!ress)
		351	{
		352	/* read any signals sent by the worker threads */
		353	char buf [32];
		354	while (read (respipe [0], buf, 32) == 32)
		355	;
		356
		357	rese = 0;
		358	}
102	}	359	}
103		360
104	pthread_mutex_unlock (&reslock);	361	pthread_mutex_unlock (&reslock);
105		362
106	if (!req)	363	if (!req)
107	break;	364	break;
108		365
109	nreqs--;	366	--nreqs;
110		367
111	if (req->type == REQ_QUIT)	368	if (req->type == REQ_QUIT)
112	started--;	369	started--;
		370	else if (req->type == REQ_GROUP && req->length)
		371	{
		372	req->fd = 1; /* mark request as delayed */
		373	continue;
		374	}
113	else	375	else
114	{	376	{
115	int errorno = errno;
116	errno = req->errorno;
117
118	if (req->type == REQ_READ)	377	if (req->type == REQ_READ)
119	SvCUR_set (req->data, req->dataoffset	378	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
120	+ req->result > 0 ? req->result : 0);
121		379
		380	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		381	SvREADONLY_off (req->data);
		382
122	if (req->data)	383	if (req->statdata)
123	SvREFCNT_dec (req->data);
124
125	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
126	{	384	{
127	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	385	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
128	PL_laststatval = req->result;	386	PL_laststatval = req->result;
129	PL_statcache = *(req->statdata);	387	PL_statcache = *(req->statdata);
130
131	Safefree (req->statdata);
132	}	388	}
133		389
134	PUSHMARK (SP);	390	req_invoke (req);
135	XPUSHs (sv_2mortal (newSViv (req->result)));
136		391
137	if (req->type == REQ_OPEN)
138	{
139	/* convert fd to fh */
140	SV *fh;
141
142	PUTBACK;
143	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
144	SPAGAIN;
145
146	fh = POPs;
147
148	PUSHMARK (SP);
149	XPUSHs (fh);
150	}
151
152	if (SvOK (req->callback))
153	{
154	PUTBACK;
155	call_sv (req->callback, G_VOID | G_EVAL);
156	SPAGAIN;
157	}
158
159	if (req->callback)
160	SvREFCNT_dec (req->callback);
161
162	errno = errorno;
163	count++;	392	count++;
164	}	393	}
165		394
166	Safefree (req);	395	req_free (req);
167	}	396	}
168		397
169	return count;	398	return count;
170	}	399	}
171		400
172	static void *aio_proc(void *arg);	401	static void *aio_proc(void *arg);
173		402
174	static void
175	start_thread (void)	403	static void start_thread (void)
176	{	404	{
177	sigset_t fullsigset, oldsigset;	405	sigset_t fullsigset, oldsigset;
178	pthread_t tid;	406	pthread_t tid;
179	pthread_attr_t attr;	407	pthread_attr_t attr;
180		408
…		…
189	started++;	417	started++;
190		418
191	sigprocmask (SIG_SETMASK, &oldsigset, 0);	419	sigprocmask (SIG_SETMASK, &oldsigset, 0);
192	}	420	}
193		421
194	static void	422	static void req_send (aio_req req)
195	send_req (aio_req req)
196	{	423	{
		424	while (started < wanted && nreqs >= started)
		425	start_thread ();
		426
197	nreqs++;	427	++nreqs;
198		428
199	pthread_mutex_lock (&reqlock);	429	pthread_mutex_lock (&reqlock);
200		430
201	req->next = 0;	431	req->next = 0;
202		432
…		…
209	reqe = reqs = req;	439	reqe = reqs = req;
210		440
211	pthread_cond_signal (&reqwait);	441	pthread_cond_signal (&reqwait);
212	pthread_mutex_unlock (&reqlock);	442	pthread_mutex_unlock (&reqlock);
213		443
214	while (nreqs > max_outstanding)	444	if (nreqs > max_outstanding)
		445	for (;;)
		446	{
		447	poll_cb ();
		448
		449	if (nreqs <= max_outstanding)
		450	break;
		451
		452	poll_wait ();
		453	}
		454	}
		455
		456	static void end_thread (void)
		457	{
		458	aio_req req;
		459	Newz (0, req, 1, aio_cb);
		460	req->type = REQ_QUIT;
		461
		462	req_send (req);
		463	}
		464
		465	static void min_parallel (int nthreads)
		466	{
		467	if (wanted < nthreads)
		468	wanted = nthreads;
		469	}
		470
		471	static void max_parallel (int nthreads)
		472	{
		473	int cur = started;
		474
		475	if (wanted > nthreads)
		476	wanted = nthreads;
		477
		478	while (cur > wanted)
		479	{
		480	end_thread ();
		481	cur--;
		482	}
		483
		484	while (started > wanted)
215	{	485	{
216	poll_wait ();	486	poll_wait ();
217	poll_cb ();	487	poll_cb ();
218	}	488	}
219	}	489	}
220		490
221	static void	491	static void create_pipe ()
222	end_thread (void)
223	{	492	{
224	aio_req req;	493	if (pipe (respipe))
225	New (0, req, 1, aio_cb);	494	croak ("unable to initialize result pipe");
226	req->type = REQ_QUIT;
227		495
228	send_req (req);	496	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
229	}	497	croak ("cannot set result pipe to nonblocking mode");
230		498
231	static void	499	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
232	read_write (int dowrite, int fd, off_t offset, size_t length,	500	croak ("cannot set result pipe to nonblocking mode");
233	SV *data, STRLEN dataoffset, SV *callback)	501	}
234	{
235	aio_req req;
236	STRLEN svlen;
237	char *svptr = SvPV (data, svlen);
238		502
239	SvUPGRADE (data, SVt_PV);	503	/*****************************************************************************/
240	SvPOK_on (data);	504	/* work around various missing functions */
241		505
242	if (dataoffset < 0)	506	#if !HAVE_PREADWRITE
		507	# define pread aio_pread
		508	# define pwrite aio_pwrite
		509
		510	/*
		511	* make our pread/pwrite safe against themselves, but not against
		512	* normal read/write by using a mutex. slows down execution a lot,
		513	* but that's your problem, not mine.
		514	*/
		515	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
		516
		517	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		518	{
		519	ssize_t res;
		520	off_t ooffset;
		521
		522	pthread_mutex_lock (&preadwritelock);
		523	ooffset = lseek (fd, 0, SEEK_CUR);
		524	lseek (fd, offset, SEEK_SET);
		525	res = read (fd, buf, count);
		526	lseek (fd, ooffset, SEEK_SET);
		527	pthread_mutex_unlock (&preadwritelock);
		528
		529	return res;
		530	}
		531
		532	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		533	{
		534	ssize_t res;
		535	off_t ooffset;
		536
		537	pthread_mutex_lock (&preadwritelock);
		538	ooffset = lseek (fd, 0, SEEK_CUR);
		539	lseek (fd, offset, SEEK_SET);
		540	res = write (fd, buf, count);
		541	lseek (fd, offset, SEEK_SET);
		542	pthread_mutex_unlock (&preadwritelock);
		543
		544	return res;
		545	}
		546	#endif
		547
		548	#if !HAVE_FDATASYNC
		549	# define fdatasync fsync
		550	#endif
		551
		552	#if !HAVE_READAHEAD
		553	# define readahead aio_readahead
		554
		555	static ssize_t readahead (int fd, off_t offset, size_t count)
		556	{
		557	char readahead_buf[4096];
		558
		559	while (count > 0)
		560	{
		561	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
		562
		563	pread (fd, readahead_buf, len, offset);
243	dataoffset += svlen;	564	offset += len;
244		565	count -= len;
245	if (dataoffset < 0 || dataoffset > svlen)
246	croak ("data offset outside of string");
247
248	if (dowrite)
249	{	566	}
250	/* write: check length and adjust. */	567
251	if (length < 0 || length + dataoffset > svlen)	568	errno = 0;
252	length = svlen - dataoffset;	569	}
		570	#endif
		571
		572	#if !HAVE_READDIR_R
		573	# define readdir_r aio_readdir_r
		574
		575	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		576
		577	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		578	{
		579	struct dirent *e;
		580	int errorno;
		581
		582	pthread_mutex_lock (&readdirlock);
		583
		584	e = readdir (dirp);
		585	errorno = errno;
		586
		587	if (e)
		588	{
		589	*res = ent;
		590	strcpy (ent->d_name, e->d_name);
253	}	591	}
254	else	592	else
		593	*res = 0;
		594
		595	pthread_mutex_unlock (&readdirlock);
		596
		597	errno = errorno;
		598	return e ? 0 : -1;
		599	}
		600	#endif
		601
		602	/* sendfile always needs emulation */
		603	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
		604	{
		605	ssize_t res;
		606
		607	if (!count)
		608	return 0;
		609
		610	#if HAVE_SENDFILE
		611	# if __linux
		612	res = sendfile (ofd, ifd, &offset, count);
		613
		614	# elif __freebsd
		615	/*
		616	* Of course, the freebsd sendfile is a dire hack with no thoughts
		617	* wasted on making it similar to other I/O functions.
		618	*/
255	{	619	{
256	/* read: grow scalar as necessary */	620	off_t sbytes;
257	svptr = SvGROW (data, length + dataoffset);	621	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		622
		623	if (res < 0 && sbytes)
		624	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
		625	res = sbytes;
		626	}
		627
		628	# elif __hpux
		629	res = sendfile (ofd, ifd, offset, count, 0, 0);
		630
		631	# elif __solaris
		632	{
		633	struct sendfilevec vec;
		634	size_t sbytes;
		635
		636	vec.sfv_fd = ifd;
		637	vec.sfv_flag = 0;
		638	vec.sfv_off = offset;
		639	vec.sfv_len = count;
		640
		641	res = sendfilev (ofd, &vec, 1, &sbytes);
		642
		643	if (res < 0 && sbytes)
		644	res = sbytes;
		645	}
		646
		647	# endif
		648	#else
		649	res = -1;
		650	errno = ENOSYS;
		651	#endif
		652
		653	if (res < 0
		654	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		655	#if __solaris
		656	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		657	#endif
		658	)
		659	)
258	}	660	{
		661	/* emulate sendfile. this is a major pain in the ass */
		662	char buf[4096];
		663	res = 0;
259		664
260	if (length < 0)	665	while (count)
261	croak ("length must not be negative");	666	{
		667	ssize_t cnt;
		668
		669	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
262		670
263	Newz (0, req, 1, aio_cb);	671	if (cnt <= 0)
		672	{
		673	if (cnt && !res) res = -1;
		674	break;
		675	}
264		676
		677	cnt = write (ofd, buf, cnt);
		678
		679	if (cnt <= 0)
		680	{
		681	if (cnt && !res) res = -1;
		682	break;
		683	}
		684
		685	offset += cnt;
		686	res += cnt;
		687	count -= cnt;
		688	}
		689	}
		690
		691	return res;
		692	}
		693
		694	/* read a full directory */
		695	static int scandir_ (const char *path, void **namesp)
		696	{
		697	DIR *dirp = opendir (path);
		698	union
		699	{
		700	struct dirent d;
		701	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		702	} u;
		703	struct dirent *entp;
		704	char *name, *names;
		705	int memlen = 4096;
		706	int memofs = 0;
		707	int res = 0;
		708	int errorno;
		709
265	if (!req)	710	if (!dirp)
266	croak ("out of memory during aio_req allocation");	711	return -1;
267		712
268	req->type = dowrite ? REQ_WRITE : REQ_READ;	713	names = malloc (memlen);
269	req->fd = fd;
270	req->offset = offset;
271	req->length = length;
272	req->data = SvREFCNT_inc (data);
273	req->dataptr = (char *)svptr + dataoffset;
274	req->callback = SvREFCNT_inc (callback);
275		714
276	send_req (req);	715	for (;;)
277	}	716	{
		717	errno = 0, readdir_r (dirp, &u.d, &entp);
278		718
279	static void *	719	if (!entp)
		720	break;
		721
		722	name = entp->d_name;
		723
		724	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		725	{
		726	int len = strlen (name) + 1;
		727
		728	res++;
		729
		730	while (memofs + len > memlen)
		731	{
		732	memlen *= 2;
		733	names = realloc (names, memlen);
		734	if (!names)
		735	break;
		736	}
		737
		738	memcpy (names + memofs, name, len);
		739	memofs += len;
		740	}
		741	}
		742
		743	errorno = errno;
		744	closedir (dirp);
		745
		746	if (errorno)
		747	{
		748	free (names);
		749	errno = errorno;
		750	res = -1;
		751	}
		752
		753	*namesp = (void *)names;
		754	return res;
		755	}
		756
		757	/*****************************************************************************/
		758
280	aio_proc (void *thr_arg)	759	static void *aio_proc (void *thr_arg)
281	{	760	{
282	aio_req req;	761	aio_req req;
283	int type;	762	int type;
284		763
285	do	764	do
…		…
304		783
305	pthread_mutex_unlock (&reqlock);	784	pthread_mutex_unlock (&reqlock);
306		785
307	errno = 0; /* strictly unnecessary */	786	errno = 0; /* strictly unnecessary */
308		787
309	type = req->type;	788	if (!req->cancelled)
310		789	switch (type = req->type) /* remember type for QUIT check */
311	switch (type)
312	{	790	{
313	case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break;	791	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
314	case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break;	792	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
315	#if SYS_readahead	793
316	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	794	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
317	#else	795	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
318	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
319	#endif
320		796
321	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	797	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
322	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	798	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
323	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	799	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
324		800
325	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	801	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
326	case REQ_CLOSE: req->result = close (req->fd); break;	802	case REQ_CLOSE: req->result = close (req->fd); break;
327	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	803	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
328
329	case REQ_FSYNC: req->result = fsync (req->fd); break;	804	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		805	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		806	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
		807	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
		808
330	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	809	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
		810	case REQ_FSYNC: req->result = fsync (req->fd); break;
		811	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
331		812
		813	case REQ_SLEEP:
		814	{
		815	struct timeval tv;
		816
		817	tv.tv_sec = req->fd;
		818	tv.tv_usec = req->fd2;
		819
		820	req->result = select (0, 0, 0, 0, &tv);
		821	}
		822
332	case REQ_QUIT:	823	case REQ_QUIT:
333	break;	824	break;
334		825
335	default:	826	default:
336	req->result = ENOSYS;	827	req->result = ENOSYS;
337	break;	828	break;
338	}	829	}
339		830
340	req->errorno = errno;	831	req->errorno = errno;
341		832
342	pthread_mutex_lock (&reslock);	833	pthread_mutex_lock (&reslock);
343		834
…		…
361	while (type != REQ_QUIT);	852	while (type != REQ_QUIT);
362		853
363	return 0;	854	return 0;
364	}	855	}
365		856
		857	/*****************************************************************************/
		858
		859	static void atfork_prepare (void)
		860	{
		861	pthread_mutex_lock (&reqlock);
		862	pthread_mutex_lock (&reslock);
		863	#if !HAVE_PREADWRITE
		864	pthread_mutex_lock (&preadwritelock);
		865	#endif
		866	#if !HAVE_READDIR_R
		867	pthread_mutex_lock (&readdirlock);
		868	#endif
		869	}
		870
		871	static void atfork_parent (void)
		872	{
		873	#if !HAVE_READDIR_R
		874	pthread_mutex_unlock (&readdirlock);
		875	#endif
		876	#if !HAVE_PREADWRITE
		877	pthread_mutex_unlock (&preadwritelock);
		878	#endif
		879	pthread_mutex_unlock (&reslock);
		880	pthread_mutex_unlock (&reqlock);
		881	}
		882
		883	static void atfork_child (void)
		884	{
		885	aio_req prv;
		886
		887	started = 0;
		888
		889	while (reqs)
		890	{
		891	prv = reqs;
		892	reqs = prv->next;
		893	req_free (prv);
		894	}
		895
		896	reqs = reqe = 0;
		897
		898	while (ress)
		899	{
		900	prv = ress;
		901	ress = prv->next;
		902	req_free (prv);
		903	}
		904
		905	ress = rese = 0;
		906
		907	close (respipe [0]);
		908	close (respipe [1]);
		909	create_pipe ();
		910
		911	atfork_parent ();
		912	}
		913
		914	#define dREQ \
		915	aio_req req; \
		916	\
		917	if (SvOK (callback) && !SvROK (callback)) \
		918	croak ("callback must be undef or of reference type"); \
		919	\
		920	Newz (0, req, 1, aio_cb); \
		921	if (!req) \
		922	croak ("out of memory during aio_req allocation"); \
		923	\
		924	req->callback = newSVsv (callback)
		925
		926	#define REQ_SEND \
		927	req_send (req); \
		928	\
		929	if (GIMME_V != G_VOID) \
		930	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		931
366	MODULE = IO::AIO PACKAGE = IO::AIO	932	MODULE = IO::AIO PACKAGE = IO::AIO
367		933
368	PROTOTYPES: ENABLE	934	PROTOTYPES: ENABLE
369		935
370	BOOT:	936	BOOT:
371	{	937	{
372	if (pipe (respipe))	938	HV *stash = gv_stashpv ("IO::AIO", 1);
373	croak ("unable to initialize result pipe");	939	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		940	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		941	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
374		942
375	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	943	create_pipe ();
376	croak ("cannot set result pipe to nonblocking mode");	944	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
377
378	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
379	croak ("cannot set result pipe to nonblocking mode");
380	}	945	}
381		946
382	void	947	void
383	min_parallel(nthreads)	948	min_parallel (nthreads)
384	int nthreads	949	int nthreads
385	PROTOTYPE: $	950	PROTOTYPE: $
386	CODE:
387	while (nthreads > started)
388	start_thread ();
389		951
390	void	952	void
391	max_parallel(nthreads)	953	max_parallel (nthreads)
392	int nthreads	954	int nthreads
393	PROTOTYPE: $	955	PROTOTYPE: $
394	CODE:
395	{
396	int cur = started;
397	while (cur > nthreads)
398	{
399	end_thread ();
400	cur--;
401	}
402
403	while (started > nthreads)
404	{
405	poll_wait ();
406	poll_cb ();
407	}
408	}
409		956
410	int	957	int
411	max_outstanding(nreqs)	958	max_outstanding (nreqs)
412	int nreqs	959	int nreqs
413	PROTOTYPE: $	960	PROTOTYPE: $
414	CODE:	961	CODE:
415	RETVAL = max_outstanding;	962	RETVAL = max_outstanding;
416	max_outstanding = nreqs;	963	max_outstanding = nreqs;
417		964
418	void	965	void
419	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	966	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
420	SV * pathname	967	SV * pathname
421	int flags	968	int flags
422	int mode	969	int mode
423	SV * callback	970	SV * callback
424	PROTOTYPE: $$$;$	971	PROTOTYPE: $$$;$
425	CODE:	972	PPCODE:
426	{	973	{
427	aio_req req;	974	dREQ;
428
429	Newz (0, req, 1, aio_cb);
430
431	if (!req)
432	croak ("out of memory during aio_req allocation");
433		975
434	req->type = REQ_OPEN;	976	req->type = REQ_OPEN;
435	req->data = newSVsv (pathname);	977	req->data = newSVsv (pathname);
436	req->dataptr = SvPV_nolen (req->data);	978	req->dataptr = SvPVbyte_nolen (req->data);
437	req->fd = flags;	979	req->fd = flags;
438	req->mode = mode;	980	req->mode = mode;
439	req->callback = SvREFCNT_inc (callback);
440		981
441	send_req (req);	982	REQ_SEND;
442	}	983	}
443		984
444	void	985	void
445	aio_close(fh,callback=&PL_sv_undef)	986	aio_close (fh,callback=&PL_sv_undef)
446	InputStream fh	987	SV * fh
447	SV * callback	988	SV * callback
448	PROTOTYPE: $;$	989	PROTOTYPE: $;$
449	ALIAS:	990	ALIAS:
450	aio_close = REQ_CLOSE	991	aio_close = REQ_CLOSE
451	aio_fsync = REQ_FSYNC	992	aio_fsync = REQ_FSYNC
452	aio_fdatasync = REQ_FDATASYNC	993	aio_fdatasync = REQ_FDATASYNC
453	CODE:	994	PPCODE:
		995	{
		996	dREQ;
		997
		998	req->type = ix;
		999	req->fh = newSVsv (fh);
		1000	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
		1001
		1002	REQ_SEND (req);
		1003	}
		1004
		1005	void
		1006	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
		1007	SV * fh
		1008	UV offset
		1009	UV length
		1010	SV * data
		1011	UV dataoffset
		1012	SV * callback
		1013	ALIAS:
		1014	aio_read = REQ_READ
		1015	aio_write = REQ_WRITE
		1016	PROTOTYPE: $$$$$;$
		1017	PPCODE:
454	{	1018	{
455	aio_req req;	1019	aio_req req;
		1020	STRLEN svlen;
		1021	char *svptr = SvPVbyte (data, svlen);
456		1022
457	Newz (0, req, 1, aio_cb);	1023	SvUPGRADE (data, SVt_PV);
		1024	SvPOK_on (data);
458		1025
459	if (!req)	1026	if (dataoffset < 0)
460	croak ("out of memory during aio_req allocation");	1027	dataoffset += svlen;
461		1028
462	req->type = ix;	1029	if (dataoffset < 0 || dataoffset > svlen)
463	req->fd = PerlIO_fileno (fh);	1030	croak ("data offset outside of string");
464	req->callback = SvREFCNT_inc (callback);
465		1031
466	send_req (req);	1032	if (ix == REQ_WRITE)
467	}	1033	{
468		1034	/* write: check length and adjust. */
469	void	1035	if (length < 0 || length + dataoffset > svlen)
470	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1036	length = svlen - dataoffset;
471	InputStream fh	1037	}
472	UV offset	1038	else
473	IV length	1039	{
474	SV * data	1040	/* read: grow scalar as necessary */
475	IV dataoffset	1041	svptr = SvGROW (data, length + dataoffset);
476	SV * callback	1042	}
477	PROTOTYPE: $$$$$;$
478	CODE:
479	read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
480
481	void
482	aio_write(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
483	OutputStream fh
484	UV offset
485	IV length
486	SV * data
487	IV dataoffset
488	SV * callback
489	PROTOTYPE: $$$$$;$
490	CODE:
491	read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
492
493	void
494	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
495	InputStream fh
496	UV offset
497	IV length
498	SV * callback
499	PROTOTYPE: $$$;$
500	CODE:
501	{
502	aio_req req;
503		1043
504	if (length < 0)	1044	if (length < 0)
505	croak ("length must not be negative");	1045	croak ("length must not be negative");
506		1046
507	Newz (0, req, 1, aio_cb);	1047	{
		1048	dREQ;
508		1049
509	if (!req)	1050	req->type = ix;
510	croak ("out of memory during aio_req allocation");	1051	req->fh = newSVsv (fh);
		1052	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
		1053	: IoOFP (sv_2io (fh)));
		1054	req->offset = offset;
		1055	req->length = length;
		1056	req->data = SvREFCNT_inc (data);
		1057	req->dataptr = (char *)svptr + dataoffset;
		1058
		1059	if (!SvREADONLY (data))
		1060	{
		1061	SvREADONLY_on (data);
		1062	req->data2ptr = (void *)data;
		1063	}
		1064
		1065	REQ_SEND;
		1066	}
		1067	}
		1068
		1069	void
		1070	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1071	SV * out_fh
		1072	SV * in_fh
		1073	UV in_offset
		1074	UV length
		1075	SV * callback
		1076	PROTOTYPE: $$$$;$
		1077	PPCODE:
		1078	{
		1079	dREQ;
		1080
		1081	req->type = REQ_SENDFILE;
		1082	req->fh = newSVsv (out_fh);
		1083	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1084	req->fh2 = newSVsv (in_fh);
		1085	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1086	req->offset = in_offset;
		1087	req->length = length;
		1088
		1089	REQ_SEND;
		1090	}
		1091
		1092	void
		1093	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
		1094	SV * fh
		1095	UV offset
		1096	IV length
		1097	SV * callback
		1098	PROTOTYPE: $$$;$
		1099	PPCODE:
		1100	{
		1101	dREQ;
511		1102
512	req->type = REQ_READAHEAD;	1103	req->type = REQ_READAHEAD;
		1104	req->fh = newSVsv (fh);
513	req->fd = PerlIO_fileno (fh);	1105	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
514	req->offset = offset;	1106	req->offset = offset;
515	req->length = length;	1107	req->length = length;
516	req->callback = SvREFCNT_inc (callback);
517		1108
518	send_req (req);	1109	REQ_SEND;
519	}	1110	}
520		1111
521	void	1112	void
522	aio_stat(fh_or_path,callback=&PL_sv_undef)	1113	aio_stat (fh_or_path,callback=&PL_sv_undef)
523	SV * fh_or_path	1114	SV * fh_or_path
524	SV * callback	1115	SV * callback
525	ALIAS:	1116	ALIAS:
526	aio_stat = REQ_STAT	1117	aio_stat = REQ_STAT
527	aio_lstat = REQ_LSTAT	1118	aio_lstat = REQ_LSTAT
528	CODE:	1119	PPCODE:
529	{	1120	{
530	aio_req req;	1121	dREQ;
531
532	Newz (0, req, 1, aio_cb);
533
534	if (!req)
535	croak ("out of memory during aio_req allocation");
536		1122
537	New (0, req->statdata, 1, Stat_t);	1123	New (0, req->statdata, 1, Stat_t);
538
539	if (!req->statdata)	1124	if (!req->statdata)
		1125	{
		1126	req_free (req);
540	croak ("out of memory during aio_req->statdata allocation");	1127	croak ("out of memory during aio_req->statdata allocation");
		1128	}
541		1129
542	if (SvPOK (fh_or_path))	1130	if (SvPOK (fh_or_path))
543	{	1131	{
544	req->type = ix;	1132	req->type = ix;
545	req->data = newSVsv (fh_or_path);	1133	req->data = newSVsv (fh_or_path);
546	req->dataptr = SvPV_nolen (req->data);	1134	req->dataptr = SvPVbyte_nolen (req->data);
547	}	1135	}
548	else	1136	else
549	{	1137	{
550	req->type = REQ_FSTAT;	1138	req->type = REQ_FSTAT;
		1139	req->fh = newSVsv (fh_or_path);
551	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1140	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
552	}	1141	}
553		1142
554	req->callback = SvREFCNT_inc (callback);	1143	REQ_SEND;
555
556	send_req (req);
557	}	1144	}
558		1145
559	void	1146	void
560	aio_unlink(pathname,callback=&PL_sv_undef)	1147	aio_unlink (pathname,callback=&PL_sv_undef)
561	SV * pathname	1148	SV * pathname
562	SV * callback	1149	SV * callback
		1150	ALIAS:
		1151	aio_unlink = REQ_UNLINK
		1152	aio_rmdir = REQ_RMDIR
		1153	aio_readdir = REQ_READDIR
563	CODE:	1154	PPCODE:
564	{	1155	{
565	aio_req req;	1156	dREQ;
566		1157
567	Newz (0, req, 1, aio_cb);	1158	req->type = ix;
		1159	req->data = newSVsv (pathname);
		1160	req->dataptr = SvPVbyte_nolen (req->data);
568		1161
569	if (!req)	1162	REQ_SEND;
570	croak ("out of memory during aio_req allocation");	1163	}
		1164
		1165	void
		1166	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1167	SV * oldpath
		1168	SV * newpath
		1169	SV * callback
		1170	ALIAS:
		1171	aio_link = REQ_LINK
		1172	aio_symlink = REQ_SYMLINK
		1173	aio_rename = REQ_RENAME
		1174	PPCODE:
		1175	{
		1176	dREQ;
571		1177
572	req->type = REQ_UNLINK;	1178	req->type = ix;
		1179	req->fh = newSVsv (oldpath);
		1180	req->data2ptr = SvPVbyte_nolen (req->fh);
573	req->data = newSVsv (pathname);	1181	req->data = newSVsv (newpath);
574	req->dataptr = SvPV_nolen (req->data);	1182	req->dataptr = SvPVbyte_nolen (req->data);
575	req->callback = SvREFCNT_inc (callback);
576		1183
577	send_req (req);	1184	REQ_SEND;
578	}	1185	}
579		1186
580	void	1187	void
		1188	aio_sleep (delay,callback=&PL_sv_undef)
		1189	double delay
		1190	SV * callback
		1191	PPCODE:
		1192	{
		1193	dREQ;
		1194
		1195	req->type = REQ_SLEEP;
		1196	req->fd = delay < 0. ? 0 : delay;
		1197	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1198
		1199	REQ_SEND;
		1200	}
		1201
		1202	void
		1203	aio_group (callback=&PL_sv_undef)
		1204	SV * callback
		1205	PROTOTYPE: ;$
		1206	PPCODE:
		1207	{
		1208	dREQ;
		1209	req->type = REQ_GROUP;
		1210	req_send (req);
		1211	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1212	}
		1213
		1214	void
581	flush()	1215	flush ()
582	PROTOTYPE:	1216	PROTOTYPE:
583	CODE:	1217	CODE:
584	while (nreqs)	1218	while (nreqs)
585	{	1219	{
586	poll_wait ();	1220	poll_wait ();
…		…
626	CODE:	1260	CODE:
627	RETVAL = nreqs;	1261	RETVAL = nreqs;
628	OUTPUT:	1262	OUTPUT:
629	RETVAL	1263	RETVAL
630		1264
		1265	PROTOTYPES: DISABLE
		1266
		1267	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1268
		1269	void
		1270	cancel (aio_req_ornot req)
		1271	PROTOTYPE:
		1272	CODE:
		1273	req_cancel (req);
		1274
		1275	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1276
		1277	void
		1278	add (aio_req grp, ...)
		1279	PPCODE:
		1280	{
		1281	int i;
		1282
		1283	if (grp->fd == 2)
		1284	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1285
		1286	for (i = 1; i < items; ++i )
		1287	{
		1288	if (GIMME_V != G_VOID)
		1289	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1290
		1291	aio_req req = SvAIO_REQ (ST (i));
		1292
		1293	if (req)
		1294	{
		1295	++grp->length;
		1296	req->grp = grp;
		1297
		1298	req->grp_prev = 0;
		1299	req->grp_next = grp->grp_first;
		1300
		1301	if (grp->grp_first)
		1302	grp->grp_first->grp_prev = req;
		1303
		1304	grp->grp_first = req;
		1305	}
		1306	}
		1307	}
		1308
		1309	void
		1310	result (aio_req grp, ...)
		1311	CODE:
		1312	{
		1313	int i;
		1314	AV *av = newAV ();
		1315
		1316	for (i = 1; i < items; ++i )
		1317	av_push (av, newSVsv (ST (i)));
		1318
		1319	SvREFCNT_dec (grp->data);
		1320	grp->data = (SV *)av;
		1321	}
		1322
		1323	void
		1324	lock (aio_req grp)
		1325	CODE:
		1326	++grp->length;
		1327
		1328	void
		1329	unlock (aio_req grp)
		1330	CODE:
		1331	aio_grp_dec (grp);
		1332
		1333	void
		1334	feeder_limit (aio_req grp, int limit)
		1335	CODE:
		1336	grp->fd2 = limit;
		1337	aio_grp_feed (grp);
		1338
		1339	void
		1340	set_feeder (aio_req grp, SV *callback=&PL_sv_undef)
		1341	CODE:
		1342	{
		1343	SvREFCNT_dec (grp->fh2);
		1344	grp->fh2 = newSVsv (callback);
		1345
		1346	if (grp->fd2 <= 0)
		1347	grp->fd2 = 2;
		1348
		1349	aio_grp_feed (grp);
		1350	}
		1351

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