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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.10 by root, Wed Jul 13 00:13:09 2005 UTC vs.
Revision 1.53 by root, Mon Oct 23 00:17:07 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
5	#define _XOPEN_SOURCE 500	8	#include "autoconf/config.h"
6		9
		10	#include <pthread.h>
		11
		12	#include <stddef.h>
		13	#include <errno.h>
		14	#include <sys/time.h>
		15	#include <sys/select.h>
7	#include <sys/types.h>	16	#include <sys/types.h>
8	#include <sys/stat.h>	17	#include <sys/stat.h>
9		18	#include <limits.h>
10	#include <unistd.h>	19	#include <unistd.h>
11	#include <fcntl.h>	20	#include <fcntl.h>
12	#include <signal.h>	21	#include <signal.h>
13	#include <sched.h>	22	#include <sched.h>
		23
		24	#if HAVE_SENDFILE
14	#if __linux	25	# if __linux
		26	# include <sys/sendfile.h>
		27	# elif __freebsd
15	#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
16	#endif	37	#endif
17		38
18	#include <pthread.h>	39	/* used for struct dirent, AIX doesn't provide it */
19		40	#ifndef NAME_MAX
20	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	41	# define NAME_MAX 4096
21	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	42	#endif
22	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
23		43
24	#if __ia64	44	#if __ia64
25	# define STACKSIZE 65536	45	# define STACKSIZE 65536
26	#else	46	#else
27	# define STACKSIZE 4096	47	# define STACKSIZE 8192
28	#endif	48	#endif
29		49
30	enum {	50	enum {
31	REQ_QUIT,	51	REQ_QUIT,
32	REQ_OPEN, REQ_CLOSE,	52	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,	53	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		54	REQ_SENDFILE,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35	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,
36	};	62	};
37		63
		64	#define AIO_REQ_KLASS "IO::AIO::REQ"
		65	#define AIO_GRP_KLASS "IO::AIO::GRP"
		66
38	typedef struct aio_cb {	67	typedef struct aio_cb
		68	{
39	struct aio_cb *volatile next;	69	struct aio_cb *volatile next;
40		70
41	int type;	71	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
42		72
43	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;
44	off_t offset;	79	off_t offset;
45	size_t length;	80	size_t length;
46	ssize_t result;	81	ssize_t result;
		82
		83	int type;
		84	int fd, fd2;
		85	int errorno;
		86	STRLEN dataoffset;
47	mode_t mode; /* open */	87	mode_t mode; /* open */
48	int errorno;	88	unsigned char cancelled;
49	SV *data, *callback;
50	void *dataptr;
51	STRLEN dataoffset;
52
53	Stat_t *statdata;
54	} aio_cb;	89	} aio_cb;
55		90
56	typedef aio_cb *aio_req;	91	typedef aio_cb *aio_req;
		92	typedef aio_cb *aio_req_ornot;
57		93
58	static int started;	94	static int started, wanted;
59	static int nreqs;	95	static volatile int nreqs;
60	static int max_outstanding = 1<<30;	96	static int max_outstanding = 1<<30;
61	static int respipe [2];	97	static int respipe [2];
62		98
63	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	99	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
64	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	100	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
65	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	101	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
66		102
67	static volatile aio_req reqs, reqe; /* queue start, queue end */	103	static volatile aio_req reqs, reqe; /* queue start, queue end */
68	static volatile aio_req ress, rese; /* queue start, queue end */	104	static volatile aio_req ress, rese; /* queue start, queue end */
69		105
70	static void	106	static void req_invoke (aio_req req);
71	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)
72	{	111	{
73	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	MAGIC *mg;
		124
		125	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		126	croak ("object of class " AIO_REQ_KLASS " expected");
		127
		128	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		129
		130	return mg ? (aio_req)mg->mg_ptr : 0;
		131	}
		132
		133	static void aio_grp_feed (aio_req grp)
		134	{
		135	while (grp->length < grp->fd2)
		136	{
		137	int old_len = grp->length;
		138
		139	if (grp->fh2 && SvOK (grp->fh2))
		140	{
		141	dSP;
		142
		143	ENTER;
		144	SAVETMPS;
		145	PUSHMARK (SP);
		146	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		147	PUTBACK;
		148	call_sv (grp->fh2, G_VOID | G_EVAL);
		149	SPAGAIN;
		150	FREETMPS;
		151	LEAVE;
		152	}
		153
		154	/* stop if no progress has been made */
		155	if (old_len == grp->length)
		156	{
		157	SvREFCNT_dec (grp->fh2);
		158	grp->fh2 = 0;
		159	break;
		160	}
		161	}
		162	}
		163
		164	static void aio_grp_dec (aio_req grp)
		165	{
		166	--grp->length;
		167
		168	/* call feeder, if applicable */
		169	aio_grp_feed (grp);
		170
		171	/* finish, if done */
		172	if (!grp->length && grp->fd)
		173	{
		174	req_invoke (grp);
		175	req_free (grp);
		176	}
		177	}
		178
		179	static void poll_wait ()
		180	{
		181	if (nreqs && !ress)
		182	{
		183	fd_set rfd;
		184	FD_ZERO(&rfd);
		185	FD_SET(respipe [0], &rfd);
		186
		187	select (respipe [0] + 1, &rfd, 0, 0, 0);
		188	}
		189	}
		190
		191	static void req_invoke (aio_req req)
		192	{
		193	dSP;
		194	int errorno = errno;
		195
		196	if (req->cancelled || !SvOK (req->callback))
74	return;	197	return;
75		198
76	fd_set rfd;	199	errno = req->errorno;
77	FD_ZERO(&rfd);
78	FD_SET(respipe [0], &rfd);
79		200
80	select (respipe [0] + 1, &rfd, 0, 0, 0);	201	ENTER;
81	}	202	SAVETMPS;
		203	PUSHMARK (SP);
		204	EXTEND (SP, 1);
82		205
83	static int	206	switch (req->type)
84	poll_cb ()	207	{
		208	case REQ_READDIR:
		209	{
		210	SV *rv = &PL_sv_undef;
		211
		212	if (req->result >= 0)
		213	{
		214	char *buf = req->data2ptr;
		215	AV *av = newAV ();
		216
		217	while (req->result)
		218	{
		219	SV *sv = newSVpv (buf, 0);
		220
		221	av_push (av, sv);
		222	buf += SvCUR (sv) + 1;
		223	req->result--;
		224	}
		225
		226	rv = sv_2mortal (newRV_noinc ((SV *)av));
		227	}
		228
		229	PUSHs (rv);
		230	}
		231	break;
		232
		233	case REQ_OPEN:
		234	{
		235	/* convert fd to fh */
		236	SV *fh;
		237
		238	PUSHs (sv_2mortal (newSViv (req->result)));
		239	PUTBACK;
		240	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		241	SPAGAIN;
		242
		243	fh = SvREFCNT_inc (POPs);
		244
		245	PUSHMARK (SP);
		246	XPUSHs (sv_2mortal (fh));
		247	}
		248	break;
		249
		250	case REQ_GROUP:
		251	req->fd = 2; /* mark group as finished */
		252
		253	if (req->data)
		254	{
		255	int i;
		256	AV *av = (AV *)req->data;
		257
		258	EXTEND (SP, AvFILL (av) + 1);
		259	for (i = 0; i <= AvFILL (av); ++i)
		260	PUSHs (*av_fetch (av, i, 0));
		261	}
		262	break;
		263
		264	case REQ_SLEEP:
		265	break;
		266
		267	default:
		268	PUSHs (sv_2mortal (newSViv (req->result)));
		269	break;
		270	}
		271
		272
		273	PUTBACK;
		274	call_sv (req->callback, G_VOID | G_EVAL);
		275	SPAGAIN;
		276
		277	FREETMPS;
		278	LEAVE;
		279
		280	errno = errorno;
		281
		282	if (SvTRUE (ERRSV))
		283	{
		284	req_free (req);
		285	croak (0);
		286	}
		287	}
		288
		289	static void req_free (aio_req req)
		290	{
		291	if (req->grp)
		292	{
		293	aio_req grp = req->grp;
		294
		295	/* unlink request */
		296	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		297	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		298
		299	if (grp->grp_first == req)
		300	grp->grp_first = req->grp_next;
		301
		302	aio_grp_dec (grp);
		303	}
		304
		305	if (req->self)
		306	{
		307	sv_unmagic (req->self, PERL_MAGIC_ext);
		308	SvREFCNT_dec (req->self);
		309	}
		310
		311	SvREFCNT_dec (req->data);
		312	SvREFCNT_dec (req->fh);
		313	SvREFCNT_dec (req->fh2);
		314	SvREFCNT_dec (req->callback);
		315	Safefree (req->statdata);
		316
		317	if (req->type == REQ_READDIR && req->result >= 0)
		318	free (req->data2ptr);
		319
		320	Safefree (req);
		321	}
		322
		323	static void req_cancel (aio_req req)
		324	{
		325	req->cancelled = 1;
		326
		327	if (req->type == REQ_GROUP)
		328	{
		329	aio_req sub;
		330
		331	for (sub = req->grp_first; sub; sub = sub->grp_next)
		332	req_cancel (sub);
		333	}
		334	}
		335
		336	static int poll_cb ()
85	{	337	{
86	dSP;	338	dSP;
87	int count = 0;	339	int count = 0;
		340	int do_croak = 0;
88	aio_req req;	341	aio_req req;
89
90	{
91	/* read and signals sent by the worker threads */
92	char buf [32];
93	while (read (respipe [0], buf, 32) > 0)
94	;
95	}
96		342
97	for (;;)	343	for (;;)
98	{	344	{
99	pthread_mutex_lock (&reslock);	345	pthread_mutex_lock (&reslock);
100
101	req = ress;	346	req = ress;
102		347
103	if (ress)	348	if (req)
104	{	349	{
105	ress = ress->next;	350	ress = req->next;
		351
106	if (!ress) rese = 0;	352	if (!ress)
		353	{
		354	/* read any signals sent by the worker threads */
		355	char buf [32];
		356	while (read (respipe [0], buf, 32) == 32)
		357	;
		358
		359	rese = 0;
		360	}
107	}	361	}
108		362
109	pthread_mutex_unlock (&reslock);	363	pthread_mutex_unlock (&reslock);
110		364
111	if (!req)	365	if (!req)
112	break;	366	break;
113		367
114	nreqs--;	368	--nreqs;
115		369
116	if (req->type == REQ_QUIT)	370	if (req->type == REQ_QUIT)
117	started--;	371	started--;
		372	else if (req->type == REQ_GROUP && req->length)
		373	{
		374	req->fd = 1; /* mark request as delayed */
		375	continue;
		376	}
118	else	377	else
119	{	378	{
120	int errorno = errno;
121	errno = req->errorno;
122
123	if (req->type == REQ_READ)	379	if (req->type == REQ_READ)
124	SvCUR_set (req->data, req->dataoffset	380	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
125	+ req->result > 0 ? req->result : 0);
126		381
		382	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		383	SvREADONLY_off (req->data);
		384
127	if (req->data)	385	if (req->statdata)
128	SvREFCNT_dec (req->data);
129
130	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
131	{	386	{
132	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	387	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
133	PL_laststatval = req->result;	388	PL_laststatval = req->result;
134	PL_statcache = *(req->statdata);	389	PL_statcache = *(req->statdata);
135
136	Safefree (req->statdata);
137	}	390	}
138		391
139	PUSHMARK (SP);	392	req_invoke (req);
140	XPUSHs (sv_2mortal (newSViv (req->result)));
141		393
142	if (req->type == REQ_OPEN)
143	{
144	/* convert fd to fh */
145	SV *fh;
146
147	PUTBACK;
148	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
149	SPAGAIN;
150
151	fh = POPs;
152
153	PUSHMARK (SP);
154	XPUSHs (fh);
155	}
156
157	if (SvOK (req->callback))
158	{
159	PUTBACK;
160	call_sv (req->callback, G_VOID | G_EVAL);
161	SPAGAIN;
162	}
163
164	if (req->callback)
165	SvREFCNT_dec (req->callback);
166
167	errno = errorno;
168	count++;	394	count++;
169	}	395	}
170		396
171	Safefree (req);	397	req_free (req);
172	}	398	}
173		399
174	return count;	400	return count;
175	}	401	}
176		402
177	static void *aio_proc(void *arg);	403	static void *aio_proc(void *arg);
178		404
179	static void
180	start_thread (void)	405	static void start_thread (void)
181	{	406	{
182	sigset_t fullsigset, oldsigset;	407	sigset_t fullsigset, oldsigset;
183	pthread_t tid;	408	pthread_t tid;
184	pthread_attr_t attr;	409	pthread_attr_t attr;
185		410
…		…
194	started++;	419	started++;
195		420
196	sigprocmask (SIG_SETMASK, &oldsigset, 0);	421	sigprocmask (SIG_SETMASK, &oldsigset, 0);
197	}	422	}
198		423
199	static void	424	static void req_send (aio_req req)
200	send_req (aio_req req)
201	{	425	{
		426	while (started < wanted && nreqs >= started)
		427	start_thread ();
		428
202	nreqs++;	429	++nreqs;
203		430
204	pthread_mutex_lock (&reqlock);	431	pthread_mutex_lock (&reqlock);
205		432
206	req->next = 0;	433	req->next = 0;
207		434
…		…
214	reqe = reqs = req;	441	reqe = reqs = req;
215		442
216	pthread_cond_signal (&reqwait);	443	pthread_cond_signal (&reqwait);
217	pthread_mutex_unlock (&reqlock);	444	pthread_mutex_unlock (&reqlock);
218		445
219	while (nreqs > max_outstanding)	446	if (nreqs > max_outstanding)
		447	for (;;)
		448	{
		449	poll_cb ();
		450
		451	if (nreqs <= max_outstanding)
		452	break;
		453
		454	poll_wait ();
		455	}
		456	}
		457
		458	static void end_thread (void)
		459	{
		460	aio_req req;
		461	Newz (0, req, 1, aio_cb);
		462	req->type = REQ_QUIT;
		463
		464	req_send (req);
		465	}
		466
		467	static void min_parallel (int nthreads)
		468	{
		469	if (wanted < nthreads)
		470	wanted = nthreads;
		471	}
		472
		473	static void max_parallel (int nthreads)
		474	{
		475	int cur = started;
		476
		477	if (wanted > nthreads)
		478	wanted = nthreads;
		479
		480	while (cur > wanted)
		481	{
		482	end_thread ();
		483	cur--;
		484	}
		485
		486	while (started > wanted)
220	{	487	{
221	poll_wait ();	488	poll_wait ();
222	poll_cb ();	489	poll_cb ();
223	}	490	}
224	}	491	}
225		492
226	static void	493	static void create_pipe ()
227	end_thread (void)
228	{	494	{
229	aio_req req;	495	if (pipe (respipe))
230	New (0, req, 1, aio_cb);	496	croak ("unable to initialize result pipe");
231	req->type = REQ_QUIT;
232		497
233	send_req (req);	498	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
234	}	499	croak ("cannot set result pipe to nonblocking mode");
235		500
236	static void	501	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
237	read_write (int dowrite, int fd, off_t offset, size_t length,	502	croak ("cannot set result pipe to nonblocking mode");
238	SV *data, STRLEN dataoffset, SV *callback)	503	}
239	{
240	aio_req req;
241	STRLEN svlen;
242	char *svptr = SvPV (data, svlen);
243		504
244	SvUPGRADE (data, SVt_PV);	505	/*****************************************************************************/
245	SvPOK_on (data);	506	/* work around various missing functions */
246		507
247	if (dataoffset < 0)	508	#if !HAVE_PREADWRITE
		509	# define pread aio_pread
		510	# define pwrite aio_pwrite
		511
		512	/*
		513	* make our pread/pwrite safe against themselves, but not against
		514	* normal read/write by using a mutex. slows down execution a lot,
		515	* but that's your problem, not mine.
		516	*/
		517	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
		518
		519	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		520	{
		521	ssize_t res;
		522	off_t ooffset;
		523
		524	pthread_mutex_lock (&preadwritelock);
		525	ooffset = lseek (fd, 0, SEEK_CUR);
		526	lseek (fd, offset, SEEK_SET);
		527	res = read (fd, buf, count);
		528	lseek (fd, ooffset, SEEK_SET);
		529	pthread_mutex_unlock (&preadwritelock);
		530
		531	return res;
		532	}
		533
		534	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		535	{
		536	ssize_t res;
		537	off_t ooffset;
		538
		539	pthread_mutex_lock (&preadwritelock);
		540	ooffset = lseek (fd, 0, SEEK_CUR);
		541	lseek (fd, offset, SEEK_SET);
		542	res = write (fd, buf, count);
		543	lseek (fd, offset, SEEK_SET);
		544	pthread_mutex_unlock (&preadwritelock);
		545
		546	return res;
		547	}
		548	#endif
		549
		550	#if !HAVE_FDATASYNC
		551	# define fdatasync fsync
		552	#endif
		553
		554	#if !HAVE_READAHEAD
		555	# define readahead aio_readahead
		556
		557	static ssize_t readahead (int fd, off_t offset, size_t count)
		558	{
		559	char readahead_buf[4096];
		560
		561	while (count > 0)
		562	{
		563	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
		564
		565	pread (fd, readahead_buf, len, offset);
248	dataoffset += svlen;	566	offset += len;
249		567	count -= len;
250	if (dataoffset < 0 || dataoffset > svlen)
251	croak ("data offset outside of string");
252
253	if (dowrite)
254	{	568	}
255	/* write: check length and adjust. */	569
256	if (length < 0 || length + dataoffset > svlen)	570	errno = 0;
257	length = svlen - dataoffset;	571	}
		572	#endif
		573
		574	#if !HAVE_READDIR_R
		575	# define readdir_r aio_readdir_r
		576
		577	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		578
		579	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		580	{
		581	struct dirent *e;
		582	int errorno;
		583
		584	pthread_mutex_lock (&readdirlock);
		585
		586	e = readdir (dirp);
		587	errorno = errno;
		588
		589	if (e)
		590	{
		591	*res = ent;
		592	strcpy (ent->d_name, e->d_name);
258	}	593	}
259	else	594	else
		595	*res = 0;
		596
		597	pthread_mutex_unlock (&readdirlock);
		598
		599	errno = errorno;
		600	return e ? 0 : -1;
		601	}
		602	#endif
		603
		604	/* sendfile always needs emulation */
		605	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
		606	{
		607	ssize_t res;
		608
		609	if (!count)
		610	return 0;
		611
		612	#if HAVE_SENDFILE
		613	# if __linux
		614	res = sendfile (ofd, ifd, &offset, count);
		615
		616	# elif __freebsd
		617	/*
		618	* Of course, the freebsd sendfile is a dire hack with no thoughts
		619	* wasted on making it similar to other I/O functions.
		620	*/
260	{	621	{
261	/* read: grow scalar as necessary */	622	off_t sbytes;
262	svptr = SvGROW (data, length + dataoffset);	623	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		624
		625	if (res < 0 && sbytes)
		626	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
		627	res = sbytes;
		628	}
		629
		630	# elif __hpux
		631	res = sendfile (ofd, ifd, offset, count, 0, 0);
		632
		633	# elif __solaris
		634	{
		635	struct sendfilevec vec;
		636	size_t sbytes;
		637
		638	vec.sfv_fd = ifd;
		639	vec.sfv_flag = 0;
		640	vec.sfv_off = offset;
		641	vec.sfv_len = count;
		642
		643	res = sendfilev (ofd, &vec, 1, &sbytes);
		644
		645	if (res < 0 && sbytes)
		646	res = sbytes;
		647	}
		648
		649	# endif
		650	#else
		651	res = -1;
		652	errno = ENOSYS;
		653	#endif
		654
		655	if (res < 0
		656	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		657	#if __solaris
		658	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		659	#endif
		660	)
		661	)
263	}	662	{
		663	/* emulate sendfile. this is a major pain in the ass */
		664	char buf[4096];
		665	res = 0;
264		666
265	if (length < 0)	667	while (count)
266	croak ("length must not be negative");	668	{
		669	ssize_t cnt;
		670
		671	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
267		672
268	Newz (0, req, 1, aio_cb);	673	if (cnt <= 0)
		674	{
		675	if (cnt && !res) res = -1;
		676	break;
		677	}
269		678
		679	cnt = write (ofd, buf, cnt);
		680
		681	if (cnt <= 0)
		682	{
		683	if (cnt && !res) res = -1;
		684	break;
		685	}
		686
		687	offset += cnt;
		688	res += cnt;
		689	count -= cnt;
		690	}
		691	}
		692
		693	return res;
		694	}
		695
		696	/* read a full directory */
		697	static int scandir_ (const char *path, void **namesp)
		698	{
		699	DIR *dirp = opendir (path);
		700	union
		701	{
		702	struct dirent d;
		703	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		704	} u;
		705	struct dirent *entp;
		706	char *name, *names;
		707	int memlen = 4096;
		708	int memofs = 0;
		709	int res = 0;
		710	int errorno;
		711
270	if (!req)	712	if (!dirp)
271	croak ("out of memory during aio_req allocation");	713	return -1;
272		714
273	req->type = dowrite ? REQ_WRITE : REQ_READ;	715	names = malloc (memlen);
274	req->fd = fd;
275	req->offset = offset;
276	req->length = length;
277	req->data = SvREFCNT_inc (data);
278	req->dataptr = (char *)svptr + dataoffset;
279	req->callback = SvREFCNT_inc (callback);
280		716
281	send_req (req);	717	for (;;)
282	}	718	{
		719	errno = 0, readdir_r (dirp, &u.d, &entp);
283		720
284	static void *	721	if (!entp)
		722	break;
		723
		724	name = entp->d_name;
		725
		726	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		727	{
		728	int len = strlen (name) + 1;
		729
		730	res++;
		731
		732	while (memofs + len > memlen)
		733	{
		734	memlen *= 2;
		735	names = realloc (names, memlen);
		736	if (!names)
		737	break;
		738	}
		739
		740	memcpy (names + memofs, name, len);
		741	memofs += len;
		742	}
		743	}
		744
		745	errorno = errno;
		746	closedir (dirp);
		747
		748	if (errorno)
		749	{
		750	free (names);
		751	errno = errorno;
		752	res = -1;
		753	}
		754
		755	*namesp = (void *)names;
		756	return res;
		757	}
		758
		759	/*****************************************************************************/
		760
285	aio_proc (void *thr_arg)	761	static void *aio_proc (void *thr_arg)
286	{	762	{
287	aio_req req;	763	aio_req req;
288	int type;	764	int type;
289		765
290	do	766	do
…		…
309		785
310	pthread_mutex_unlock (&reqlock);	786	pthread_mutex_unlock (&reqlock);
311		787
312	errno = 0; /* strictly unnecessary */	788	errno = 0; /* strictly unnecessary */
313		789
314	type = req->type;	790	if (!req->cancelled)
315		791	switch (type = req->type) /* remember type for QUIT check */
316	switch (type)
317	{	792	{
318	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	793	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
319	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	794	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
320	#if SYS_readahead	795
321	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	796	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
322	#else	797	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
323	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
324	#endif
325		798
326	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	799	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
327	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	800	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
328	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	801	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
329		802
330	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	803	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
331	case REQ_CLOSE: req->result = close (req->fd); break;	804	case REQ_CLOSE: req->result = close (req->fd); break;
332	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	805	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
333
334	case REQ_FSYNC: req->result = fsync (req->fd); break;	806	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		807	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		808	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
		809	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
		810
335	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	811	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
		812	case REQ_FSYNC: req->result = fsync (req->fd); break;
		813	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
336		814
		815	case REQ_SLEEP:
		816	{
		817	struct timeval tv;
		818
		819	tv.tv_sec = req->fd;
		820	tv.tv_usec = req->fd2;
		821
		822	req->result = select (0, 0, 0, 0, &tv);
		823	}
		824
337	case REQ_QUIT:	825	case REQ_QUIT:
338	break;	826	break;
339		827
340	default:	828	default:
341	req->result = ENOSYS;	829	req->result = ENOSYS;
342	break;	830	break;
343	}	831	}
344		832
345	req->errorno = errno;	833	req->errorno = errno;
346		834
347	pthread_mutex_lock (&reslock);	835	pthread_mutex_lock (&reslock);
348		836
…		…
366	while (type != REQ_QUIT);	854	while (type != REQ_QUIT);
367		855
368	return 0;	856	return 0;
369	}	857	}
370		858
		859	/*****************************************************************************/
		860
		861	static void atfork_prepare (void)
		862	{
		863	pthread_mutex_lock (&reqlock);
		864	pthread_mutex_lock (&reslock);
		865	#if !HAVE_PREADWRITE
		866	pthread_mutex_lock (&preadwritelock);
		867	#endif
		868	#if !HAVE_READDIR_R
		869	pthread_mutex_lock (&readdirlock);
		870	#endif
		871	}
		872
		873	static void atfork_parent (void)
		874	{
		875	#if !HAVE_READDIR_R
		876	pthread_mutex_unlock (&readdirlock);
		877	#endif
		878	#if !HAVE_PREADWRITE
		879	pthread_mutex_unlock (&preadwritelock);
		880	#endif
		881	pthread_mutex_unlock (&reslock);
		882	pthread_mutex_unlock (&reqlock);
		883	}
		884
		885	static void atfork_child (void)
		886	{
		887	aio_req prv;
		888
		889	started = 0;
		890
		891	while (reqs)
		892	{
		893	prv = reqs;
		894	reqs = prv->next;
		895	req_free (prv);
		896	}
		897
		898	reqs = reqe = 0;
		899
		900	while (ress)
		901	{
		902	prv = ress;
		903	ress = prv->next;
		904	req_free (prv);
		905	}
		906
		907	ress = rese = 0;
		908
		909	close (respipe [0]);
		910	close (respipe [1]);
		911	create_pipe ();
		912
		913	atfork_parent ();
		914	}
		915
		916	#define dREQ \
		917	aio_req req; \
		918	\
		919	if (SvOK (callback) && !SvROK (callback)) \
		920	croak ("callback must be undef or of reference type"); \
		921	\
		922	Newz (0, req, 1, aio_cb); \
		923	if (!req) \
		924	croak ("out of memory during aio_req allocation"); \
		925	\
		926	req->callback = newSVsv (callback)
		927
		928	#define REQ_SEND \
		929	req_send (req); \
		930	\
		931	if (GIMME_V != G_VOID) \
		932	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		933
371	MODULE = IO::AIO PACKAGE = IO::AIO	934	MODULE = IO::AIO PACKAGE = IO::AIO
372		935
373	PROTOTYPES: ENABLE	936	PROTOTYPES: ENABLE
374		937
375	BOOT:	938	BOOT:
376	{	939	{
377	if (pipe (respipe))	940	HV *stash = gv_stashpv ("IO::AIO", 1);
378	croak ("unable to initialize result pipe");	941	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		942	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		943	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
379		944
380	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	945	create_pipe ();
381	croak ("cannot set result pipe to nonblocking mode");	946	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
382
383	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
384	croak ("cannot set result pipe to nonblocking mode");
385	}	947	}
386		948
387	void	949	void
388	min_parallel(nthreads)	950	min_parallel (nthreads)
389	int nthreads	951	int nthreads
390	PROTOTYPE: $	952	PROTOTYPE: $
391	CODE:
392	while (nthreads > started)
393	start_thread ();
394		953
395	void	954	void
396	max_parallel(nthreads)	955	max_parallel (nthreads)
397	int nthreads	956	int nthreads
398	PROTOTYPE: $	957	PROTOTYPE: $
399	CODE:
400	{
401	int cur = started;
402	while (cur > nthreads)
403	{
404	end_thread ();
405	cur--;
406	}
407
408	while (started > nthreads)
409	{
410	poll_wait ();
411	poll_cb ();
412	}
413	}
414		958
415	int	959	int
416	max_outstanding(nreqs)	960	max_outstanding (nreqs)
417	int nreqs	961	int nreqs
418	PROTOTYPE: $	962	PROTOTYPE: $
419	CODE:	963	CODE:
420	RETVAL = max_outstanding;	964	RETVAL = max_outstanding;
421	max_outstanding = nreqs;	965	max_outstanding = nreqs;
422		966
423	void	967	void
424	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	968	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
425	SV * pathname	969	SV * pathname
426	int flags	970	int flags
427	int mode	971	int mode
428	SV * callback	972	SV * callback
429	PROTOTYPE: $$$;$	973	PROTOTYPE: $$$;$
430	CODE:	974	PPCODE:
431	{	975	{
432	aio_req req;	976	dREQ;
433
434	Newz (0, req, 1, aio_cb);
435
436	if (!req)
437	croak ("out of memory during aio_req allocation");
438		977
439	req->type = REQ_OPEN;	978	req->type = REQ_OPEN;
440	req->data = newSVsv (pathname);	979	req->data = newSVsv (pathname);
441	req->dataptr = SvPV_nolen (req->data);	980	req->dataptr = SvPVbyte_nolen (req->data);
442	req->fd = flags;	981	req->fd = flags;
443	req->mode = mode;	982	req->mode = mode;
444	req->callback = SvREFCNT_inc (callback);
445		983
446	send_req (req);	984	REQ_SEND;
447	}	985	}
448		986
449	void	987	void
450	aio_close(fh,callback=&PL_sv_undef)	988	aio_close (fh,callback=&PL_sv_undef)
451	InputStream fh	989	SV * fh
452	SV * callback	990	SV * callback
453	PROTOTYPE: $;$	991	PROTOTYPE: $;$
454	ALIAS:	992	ALIAS:
455	aio_close = REQ_CLOSE	993	aio_close = REQ_CLOSE
456	aio_fsync = REQ_FSYNC	994	aio_fsync = REQ_FSYNC
457	aio_fdatasync = REQ_FDATASYNC	995	aio_fdatasync = REQ_FDATASYNC
458	CODE:	996	PPCODE:
		997	{
		998	dREQ;
		999
		1000	req->type = ix;
		1001	req->fh = newSVsv (fh);
		1002	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
		1003
		1004	REQ_SEND (req);
		1005	}
		1006
		1007	void
		1008	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
		1009	SV * fh
		1010	UV offset
		1011	UV length
		1012	SV * data
		1013	UV dataoffset
		1014	SV * callback
		1015	ALIAS:
		1016	aio_read = REQ_READ
		1017	aio_write = REQ_WRITE
		1018	PROTOTYPE: $$$$$;$
		1019	PPCODE:
459	{	1020	{
460	aio_req req;	1021	aio_req req;
		1022	STRLEN svlen;
		1023	char *svptr = SvPVbyte (data, svlen);
461		1024
462	Newz (0, req, 1, aio_cb);	1025	SvUPGRADE (data, SVt_PV);
		1026	SvPOK_on (data);
463		1027
464	if (!req)	1028	if (dataoffset < 0)
465	croak ("out of memory during aio_req allocation");	1029	dataoffset += svlen;
466		1030
467	req->type = ix;	1031	if (dataoffset < 0 || dataoffset > svlen)
468	req->fd = PerlIO_fileno (fh);	1032	croak ("data offset outside of string");
469	req->callback = SvREFCNT_inc (callback);
470		1033
471	send_req (req);	1034	if (ix == REQ_WRITE)
472	}	1035	{
473		1036	/* write: check length and adjust. */
474	void	1037	if (length < 0 || length + dataoffset > svlen)
475	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1038	length = svlen - dataoffset;
476	InputStream fh	1039	}
477	UV offset	1040	else
478	IV length	1041	{
479	SV * data	1042	/* read: grow scalar as necessary */
480	IV dataoffset	1043	svptr = SvGROW (data, length + dataoffset);
481	SV * callback	1044	}
482	PROTOTYPE: $$$$$;$
483	CODE:
484	read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
485
486	void
487	aio_write(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
488	OutputStream fh
489	UV offset
490	IV length
491	SV * data
492	IV dataoffset
493	SV * callback
494	PROTOTYPE: $$$$$;$
495	CODE:
496	read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
497
498	void
499	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
500	InputStream fh
501	UV offset
502	IV length
503	SV * callback
504	PROTOTYPE: $$$;$
505	CODE:
506	{
507	aio_req req;
508		1045
509	if (length < 0)	1046	if (length < 0)
510	croak ("length must not be negative");	1047	croak ("length must not be negative");
511		1048
512	Newz (0, req, 1, aio_cb);	1049	{
		1050	dREQ;
513		1051
514	if (!req)	1052	req->type = ix;
515	croak ("out of memory during aio_req allocation");	1053	req->fh = newSVsv (fh);
		1054	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
		1055	: IoOFP (sv_2io (fh)));
		1056	req->offset = offset;
		1057	req->length = length;
		1058	req->data = SvREFCNT_inc (data);
		1059	req->dataptr = (char *)svptr + dataoffset;
		1060
		1061	if (!SvREADONLY (data))
		1062	{
		1063	SvREADONLY_on (data);
		1064	req->data2ptr = (void *)data;
		1065	}
		1066
		1067	REQ_SEND;
		1068	}
		1069	}
		1070
		1071	void
		1072	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1073	SV * out_fh
		1074	SV * in_fh
		1075	UV in_offset
		1076	UV length
		1077	SV * callback
		1078	PROTOTYPE: $$$$;$
		1079	PPCODE:
		1080	{
		1081	dREQ;
		1082
		1083	req->type = REQ_SENDFILE;
		1084	req->fh = newSVsv (out_fh);
		1085	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1086	req->fh2 = newSVsv (in_fh);
		1087	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1088	req->offset = in_offset;
		1089	req->length = length;
		1090
		1091	REQ_SEND;
		1092	}
		1093
		1094	void
		1095	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
		1096	SV * fh
		1097	UV offset
		1098	IV length
		1099	SV * callback
		1100	PROTOTYPE: $$$;$
		1101	PPCODE:
		1102	{
		1103	dREQ;
516		1104
517	req->type = REQ_READAHEAD;	1105	req->type = REQ_READAHEAD;
		1106	req->fh = newSVsv (fh);
518	req->fd = PerlIO_fileno (fh);	1107	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
519	req->offset = offset;	1108	req->offset = offset;
520	req->length = length;	1109	req->length = length;
521	req->callback = SvREFCNT_inc (callback);
522		1110
523	send_req (req);	1111	REQ_SEND;
524	}	1112	}
525		1113
526	void	1114	void
527	aio_stat(fh_or_path,callback=&PL_sv_undef)	1115	aio_stat (fh_or_path,callback=&PL_sv_undef)
528	SV * fh_or_path	1116	SV * fh_or_path
529	SV * callback	1117	SV * callback
530	ALIAS:	1118	ALIAS:
531	aio_stat = REQ_STAT	1119	aio_stat = REQ_STAT
532	aio_lstat = REQ_LSTAT	1120	aio_lstat = REQ_LSTAT
533	CODE:	1121	PPCODE:
534	{	1122	{
535	aio_req req;	1123	dREQ;
536
537	Newz (0, req, 1, aio_cb);
538
539	if (!req)
540	croak ("out of memory during aio_req allocation");
541		1124
542	New (0, req->statdata, 1, Stat_t);	1125	New (0, req->statdata, 1, Stat_t);
543
544	if (!req->statdata)	1126	if (!req->statdata)
		1127	{
		1128	req_free (req);
545	croak ("out of memory during aio_req->statdata allocation");	1129	croak ("out of memory during aio_req->statdata allocation");
		1130	}
546		1131
547	if (SvPOK (fh_or_path))	1132	if (SvPOK (fh_or_path))
548	{	1133	{
549	req->type = ix;	1134	req->type = ix;
550	req->data = newSVsv (fh_or_path);	1135	req->data = newSVsv (fh_or_path);
551	req->dataptr = SvPV_nolen (req->data);	1136	req->dataptr = SvPVbyte_nolen (req->data);
552	}	1137	}
553	else	1138	else
554	{	1139	{
555	req->type = REQ_FSTAT;	1140	req->type = REQ_FSTAT;
		1141	req->fh = newSVsv (fh_or_path);
556	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1142	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
557	}	1143	}
558		1144
559	req->callback = SvREFCNT_inc (callback);	1145	REQ_SEND;
560
561	send_req (req);
562	}	1146	}
563		1147
564	void	1148	void
565	aio_unlink(pathname,callback=&PL_sv_undef)	1149	aio_unlink (pathname,callback=&PL_sv_undef)
566	SV * pathname	1150	SV * pathname
567	SV * callback	1151	SV * callback
		1152	ALIAS:
		1153	aio_unlink = REQ_UNLINK
		1154	aio_rmdir = REQ_RMDIR
		1155	aio_readdir = REQ_READDIR
568	CODE:	1156	PPCODE:
569	{	1157	{
570	aio_req req;	1158	dREQ;
571		1159
572	Newz (0, req, 1, aio_cb);	1160	req->type = ix;
		1161	req->data = newSVsv (pathname);
		1162	req->dataptr = SvPVbyte_nolen (req->data);
573		1163
574	if (!req)	1164	REQ_SEND;
575	croak ("out of memory during aio_req allocation");	1165	}
		1166
		1167	void
		1168	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1169	SV * oldpath
		1170	SV * newpath
		1171	SV * callback
		1172	ALIAS:
		1173	aio_link = REQ_LINK
		1174	aio_symlink = REQ_SYMLINK
		1175	aio_rename = REQ_RENAME
		1176	PPCODE:
		1177	{
		1178	dREQ;
576		1179
577	req->type = REQ_UNLINK;	1180	req->type = ix;
		1181	req->fh = newSVsv (oldpath);
		1182	req->data2ptr = SvPVbyte_nolen (req->fh);
578	req->data = newSVsv (pathname);	1183	req->data = newSVsv (newpath);
579	req->dataptr = SvPV_nolen (req->data);	1184	req->dataptr = SvPVbyte_nolen (req->data);
580	req->callback = SvREFCNT_inc (callback);
581		1185
582	send_req (req);	1186	REQ_SEND;
583	}	1187	}
584		1188
585	void	1189	void
		1190	aio_sleep (delay,callback=&PL_sv_undef)
		1191	double delay
		1192	SV * callback
		1193	PPCODE:
		1194	{
		1195	dREQ;
		1196
		1197	req->type = REQ_SLEEP;
		1198	req->fd = delay < 0. ? 0 : delay;
		1199	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1200
		1201	REQ_SEND;
		1202	}
		1203
		1204	void
		1205	aio_group (callback=&PL_sv_undef)
		1206	SV * callback
		1207	PROTOTYPE: ;$
		1208	PPCODE:
		1209	{
		1210	dREQ;
		1211	req->type = REQ_GROUP;
		1212	req_send (req);
		1213	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1214	}
		1215
		1216	void
586	flush()	1217	flush ()
587	PROTOTYPE:	1218	PROTOTYPE:
588	CODE:	1219	CODE:
589	while (nreqs)	1220	while (nreqs)
590	{	1221	{
591	poll_wait ();	1222	poll_wait ();
…		…
631	CODE:	1262	CODE:
632	RETVAL = nreqs;	1263	RETVAL = nreqs;
633	OUTPUT:	1264	OUTPUT:
634	RETVAL	1265	RETVAL
635		1266
		1267	PROTOTYPES: DISABLE
		1268
		1269	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1270
		1271	void
		1272	cancel (aio_req_ornot req)
		1273	PROTOTYPE:
		1274	CODE:
		1275	req_cancel (req);
		1276
		1277	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1278
		1279	void
		1280	add (aio_req grp, ...)
		1281	PPCODE:
		1282	{
		1283	int i;
		1284	aio_req req;
		1285
		1286	if (grp->fd == 2)
		1287	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1288
		1289	for (i = 1; i < items; ++i )
		1290	{
		1291	if (GIMME_V != G_VOID)
		1292	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1293
		1294	req = SvAIO_REQ (ST (i));
		1295
		1296	if (req)
		1297	{
		1298	++grp->length;
		1299	req->grp = grp;
		1300
		1301	req->grp_prev = 0;
		1302	req->grp_next = grp->grp_first;
		1303
		1304	if (grp->grp_first)
		1305	grp->grp_first->grp_prev = req;
		1306
		1307	grp->grp_first = req;
		1308	}
		1309	}
		1310	}
		1311
		1312	void
		1313	result (aio_req grp, ...)
		1314	CODE:
		1315	{
		1316	int i;
		1317	AV *av = newAV ();
		1318
		1319	for (i = 1; i < items; ++i )
		1320	av_push (av, newSVsv (ST (i)));
		1321
		1322	SvREFCNT_dec (grp->data);
		1323	grp->data = (SV *)av;
		1324	}
		1325
		1326	void
		1327	lock (aio_req grp)
		1328	CODE:
		1329	++grp->length;
		1330
		1331	void
		1332	unlock (aio_req grp)
		1333	CODE:
		1334	aio_grp_dec (grp);
		1335
		1336	void
		1337	feeder_limit (aio_req grp, int limit)
		1338	CODE:
		1339	grp->fd2 = limit;
		1340	aio_grp_feed (grp);
		1341
		1342	void
		1343	set_feeder (aio_req grp, SV *callback=&PL_sv_undef)
		1344	CODE:
		1345	{
		1346	SvREFCNT_dec (grp->fh2);
		1347	grp->fh2 = newSVsv (callback);
		1348
		1349	if (grp->fd2 <= 0)
		1350	grp->fd2 = 2;
		1351
		1352	aio_grp_feed (grp);
		1353	}
		1354

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