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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.7 by root, Mon Jul 11 01:49:14 2005 UTC vs.
Revision 1.51 by root, Sun Oct 22 22:14:33 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	#include <endian.h>
12		23
13	#include <pthread.h>	24	#if HAVE_SENDFILE
		25	# if __linux
		26	# include <sys/sendfile.h>
		27	# elif __freebsd
14	#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
15		38
16	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	39	/* used for struct dirent, AIX doesn't provide it */
17	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	40	#ifndef NAME_MAX
18	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	41	# define NAME_MAX 4096
		42	#endif
19		43
20	#if __ia64	44	#if __ia64
21	# define STACKSIZE 65536	45	# define STACKSIZE 65536
22	#else	46	#else
23	# define STACKSIZE 4096	47	# define STACKSIZE 8192
24	#endif	48	#endif
25		49
26	enum {	50	enum {
27	REQ_QUIT,	51	REQ_QUIT,
28	REQ_OPEN, REQ_CLOSE,	52	REQ_OPEN, REQ_CLOSE,
29	REQ_READ, REQ_WRITE, REQ_READAHEAD,	53	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		54	REQ_SENDFILE,
30	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
31	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,
32	};	62	};
33		63
		64	#define AIO_REQ_KLASS "IO::AIO::REQ"
		65	#define AIO_GRP_KLASS "IO::AIO::GRP"
		66
34	typedef struct aio_cb {	67	typedef struct aio_cb
		68	{
35	struct aio_cb *volatile next;	69	struct aio_cb *volatile next;
36		70
37	int type;	71	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
38		72
39	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;
40	off_t offset;	79	off_t offset;
41	size_t length;	80	size_t length;
42	ssize_t result;	81	ssize_t result;
		82
		83	int type;
		84	int fd, fd2;
		85	int errorno;
		86	STRLEN dataoffset;
43	mode_t mode; /* open */	87	mode_t mode; /* open */
44	int errorno;	88	unsigned char cancelled;
45	SV *data, *callback;
46	void *dataptr;
47	STRLEN dataoffset;
48
49	Stat_t *statdata;
50	} aio_cb;	89	} aio_cb;
51		90
52	typedef aio_cb *aio_req;	91	typedef aio_cb *aio_req;
		92	typedef aio_cb *aio_req_ornot;
53		93
54	static int started;	94	static int started, wanted;
55	static int nreqs;	95	static volatile int nreqs;
56	static int max_outstanding = 1<<30;	96	static int max_outstanding = 1<<30;
57	static int respipe [2];	97	static int respipe [2];
58		98
59	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	99	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
60	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	100	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
61	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	101	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
62		102
63	static volatile aio_req reqs, reqe; /* queue start, queue end */	103	static volatile aio_req reqs, reqe; /* queue start, queue end */
64	static volatile aio_req ress, rese; /* queue start, queue end */	104	static volatile aio_req ress, rese; /* queue start, queue end */
65		105
66	static void	106	static void req_invoke (aio_req req);
67	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)
68	{	111	{
69	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))
70	return;	195	return;
71		196
72	fd_set rfd;	197	errno = req->errorno;
73	FD_ZERO(&rfd);
74	FD_SET(respipe [0], &rfd);
75		198
76	select (respipe [0] + 1, &rfd, 0, 0, 0);	199	ENTER;
77	}	200	SAVETMPS;
		201	PUSHMARK (SP);
		202	EXTEND (SP, 1);
78		203
79	static int	204	switch (req->type)
80	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 ()
81	{	335	{
82	dSP;	336	dSP;
83	int count = 0;	337	int count = 0;
		338	int do_croak = 0;
84	aio_req req;	339	aio_req req;
85
86	{
87	/* read and signals sent by the worker threads */
88	char buf [32];
89	while (read (respipe [0], buf, 32) > 0)
90	;
91	}
92		340
93	for (;;)	341	for (;;)
94	{	342	{
95	pthread_mutex_lock (&reslock);	343	pthread_mutex_lock (&reslock);
96
97	req = ress;	344	req = ress;
98		345
99	if (ress)	346	if (req)
100	{	347	{
101	ress = ress->next;	348	ress = req->next;
		349
102	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	}
103	}	359	}
104		360
105	pthread_mutex_unlock (&reslock);	361	pthread_mutex_unlock (&reslock);
106		362
107	if (!req)	363	if (!req)
108	break;	364	break;
109		365
110	nreqs--;	366	--nreqs;
111		367
112	if (req->type == REQ_QUIT)	368	if (req->type == REQ_QUIT)
113	started--;	369	started--;
		370	else if (req->type == REQ_GROUP && req->length)
		371	{
		372	req->fd = 1; /* mark request as delayed */
		373	continue;
		374	}
114	else	375	else
115	{	376	{
116	int errorno = errno;
117	errno = req->errorno;
118
119	if (req->type == REQ_READ)	377	if (req->type == REQ_READ)
120	SvCUR_set (req->data, req->dataoffset	378	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
121	+ req->result > 0 ? req->result : 0);
122		379
		380	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		381	SvREADONLY_off (req->data);
		382
123	if (req->data)	383	if (req->statdata)
124	SvREFCNT_dec (req->data);
125
126	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
127	{	384	{
128	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	385	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
129	PL_laststatval = req->result;	386	PL_laststatval = req->result;
130	PL_statcache = *(req->statdata);	387	PL_statcache = *(req->statdata);
131
132	Safefree (req->statdata);
133	}	388	}
134		389
135	PUSHMARK (SP);	390	req_invoke (req);
136	XPUSHs (sv_2mortal (newSViv (req->result)));
137		391
138	if (req->type == REQ_OPEN)
139	{
140	/* convert fd to fh */
141	SV *fh;
142
143	PUTBACK;
144	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
145	SPAGAIN;
146
147	fh = POPs;
148
149	PUSHMARK (SP);
150	XPUSHs (fh);
151	}
152
153	PUTBACK;
154	call_sv (req->callback, G_VOID | G_EVAL);
155	SPAGAIN;
156
157	if (req->callback)
158	SvREFCNT_dec (req->callback);
159
160	errno = errorno;
161	count++;	392	count++;
162	}	393	}
163		394
164	Safefree (req);	395	req_free (req);
165	}	396	}
166		397
167	return count;	398	return count;
168	}	399	}
169		400
170	static void *aio_proc(void *arg);	401	static void *aio_proc(void *arg);
171		402
172	static void
173	start_thread (void)	403	static void start_thread (void)
174	{	404	{
175	sigset_t fullsigset, oldsigset;	405	sigset_t fullsigset, oldsigset;
176	pthread_t tid;	406	pthread_t tid;
177	pthread_attr_t attr;	407	pthread_attr_t attr;
178		408
…		…
187	started++;	417	started++;
188		418
189	sigprocmask (SIG_SETMASK, &oldsigset, 0);	419	sigprocmask (SIG_SETMASK, &oldsigset, 0);
190	}	420	}
191		421
192	static void	422	static void req_send (aio_req req)
193	send_req (aio_req req)
194	{	423	{
		424	while (started < wanted && nreqs >= started)
		425	start_thread ();
		426
195	nreqs++;	427	++nreqs;
196		428
197	pthread_mutex_lock (&reqlock);	429	pthread_mutex_lock (&reqlock);
198		430
199	req->next = 0;	431	req->next = 0;
200		432
…		…
207	reqe = reqs = req;	439	reqe = reqs = req;
208		440
209	pthread_cond_signal (&reqwait);	441	pthread_cond_signal (&reqwait);
210	pthread_mutex_unlock (&reqlock);	442	pthread_mutex_unlock (&reqlock);
211		443
212	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)
213	{	485	{
214	poll_wait ();	486	poll_wait ();
215	poll_cb ();	487	poll_cb ();
216	}	488	}
217	}	489	}
218		490
219	static void	491	static void create_pipe ()
220	end_thread (void)
221	{	492	{
222	aio_req req;	493	if (pipe (respipe))
223	New (0, req, 1, aio_cb);	494	croak ("unable to initialize result pipe");
224	req->type = REQ_QUIT;
225		495
226	send_req (req);	496	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
227	}	497	croak ("cannot set result pipe to nonblocking mode");
228		498
229	static void	499	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
230	read_write (int dowrite, int fd, off_t offset, size_t length,	500	croak ("cannot set result pipe to nonblocking mode");
231	SV *data, STRLEN dataoffset, SV *callback)	501	}
232	{
233	aio_req req;
234	STRLEN svlen;
235	char *svptr = SvPV (data, svlen);
236		502
237	SvUPGRADE (data, SVt_PV);	503	/*****************************************************************************/
238	SvPOK_on (data);	504	/* work around various missing functions */
239		505
240	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);
241	dataoffset += svlen;	564	offset += len;
242		565	count -= len;
243	if (dataoffset < 0 || dataoffset > svlen)
244	croak ("data offset outside of string");
245
246	if (dowrite)
247	{	566	}
248	/* write: check length and adjust. */	567
249	if (length < 0 || length + dataoffset > svlen)	568	errno = 0;
250	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);
251	}	591	}
252	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	*/
253	{	619	{
254	/* read: grow scalar as necessary */	620	off_t sbytes;
255	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	)
256	}	660	{
		661	/* emulate sendfile. this is a major pain in the ass */
		662	char buf[4096];
		663	res = 0;
257		664
258	if (length < 0)	665	while (count)
259	croak ("length must not be negative");	666	{
		667	ssize_t cnt;
		668
		669	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
260		670
261	Newz (0, req, 1, aio_cb);	671	if (cnt <= 0)
		672	{
		673	if (cnt && !res) res = -1;
		674	break;
		675	}
262		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
263	if (!req)	710	if (!dirp)
264	croak ("out of memory during aio_req allocation");	711	return -1;
265		712
266	req->type = dowrite ? REQ_WRITE : REQ_READ;	713	names = malloc (memlen);
267	req->fd = fd;
268	req->offset = offset;
269	req->length = length;
270	req->data = SvREFCNT_inc (data);
271	req->dataptr = (char *)svptr + dataoffset;
272	req->callback = SvREFCNT_inc (callback);
273		714
274	send_req (req);	715	for (;;)
275	}	716	{
		717	errno = 0, readdir_r (dirp, &u.d, &entp);
276		718
277	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
278	aio_proc (void *thr_arg)	759	static void *aio_proc (void *thr_arg)
279	{	760	{
280	aio_req req;	761	aio_req req;
281	int type;	762	int type;
282		763
283	do	764	do
…		…
302		783
303	pthread_mutex_unlock (&reqlock);	784	pthread_mutex_unlock (&reqlock);
304		785
305	errno = 0; /* strictly unnecessary */	786	errno = 0; /* strictly unnecessary */
306		787
307	type = req->type;	788	if (!req->cancelled)
308		789	switch (type = req->type) /* remember type for QUIT check */
309	switch (type)
310	{	790	{
311	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;
312	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;
313	#if SYS_readahead	793
314	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;
315	#else	795	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
316	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
317	#endif
318		796
319	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	797	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
320	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	798	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
321	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	799	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
322		800
323	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;
324	case REQ_CLOSE: req->result = close (req->fd); break;	802	case REQ_CLOSE: req->result = close (req->fd); break;
325	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	803	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
326
327	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
328	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;
329		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
330	case REQ_QUIT:	823	case REQ_QUIT:
331	break;	824	break;
332		825
333	default:	826	default:
334	req->result = ENOSYS;	827	req->result = ENOSYS;
335	break;	828	break;
336	}	829	}
337		830
338	req->errorno = errno;	831	req->errorno = errno;
339		832
340	pthread_mutex_lock (&reslock);	833	pthread_mutex_lock (&reslock);
341		834
342	req->next = 0;	835	req->next = 0;
343		836
		837	printf ("queue rese %p\n", rese);//D
344	if (rese)	838	if (rese)
345	{	839	{
346	rese->next = req;	840	rese->next = req;
347	rese = req;	841	rese = req;
348	}	842	}
…		…
359	while (type != REQ_QUIT);	853	while (type != REQ_QUIT);
360		854
361	return 0;	855	return 0;
362	}	856	}
363		857
		858	/*****************************************************************************/
		859
		860	static void atfork_prepare (void)
		861	{
		862	pthread_mutex_lock (&reqlock);
		863	pthread_mutex_lock (&reslock);
		864	#if !HAVE_PREADWRITE
		865	pthread_mutex_lock (&preadwritelock);
		866	#endif
		867	#if !HAVE_READDIR_R
		868	pthread_mutex_lock (&readdirlock);
		869	#endif
		870	}
		871
		872	static void atfork_parent (void)
		873	{
		874	#if !HAVE_READDIR_R
		875	pthread_mutex_unlock (&readdirlock);
		876	#endif
		877	#if !HAVE_PREADWRITE
		878	pthread_mutex_unlock (&preadwritelock);
		879	#endif
		880	pthread_mutex_unlock (&reslock);
		881	pthread_mutex_unlock (&reqlock);
		882	}
		883
		884	static void atfork_child (void)
		885	{
		886	aio_req prv;
		887
		888	started = 0;
		889
		890	while (reqs)
		891	{
		892	prv = reqs;
		893	reqs = prv->next;
		894	req_free (prv);
		895	}
		896
		897	reqs = reqe = 0;
		898
		899	while (ress)
		900	{
		901	prv = ress;
		902	ress = prv->next;
		903	req_free (prv);
		904	}
		905
		906	ress = rese = 0;
		907
		908	close (respipe [0]);
		909	close (respipe [1]);
		910	create_pipe ();
		911
		912	atfork_parent ();
		913	}
		914
		915	#define dREQ \
		916	aio_req req; \
		917	\
		918	if (SvOK (callback) && !SvROK (callback)) \
		919	croak ("callback must be undef or of reference type"); \
		920	\
		921	Newz (0, req, 1, aio_cb); \
		922	if (!req) \
		923	croak ("out of memory during aio_req allocation"); \
		924	\
		925	req->callback = newSVsv (callback)
		926
		927	#define REQ_SEND \
		928	req_send (req); \
		929	\
		930	if (GIMME_V != G_VOID) \
		931	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		932
364	MODULE = IO::AIO PACKAGE = IO::AIO	933	MODULE = IO::AIO PACKAGE = IO::AIO
365		934
		935	PROTOTYPES: ENABLE
		936
366	BOOT:	937	BOOT:
367	{	938	{
368	if (pipe (respipe))	939	HV *stash = gv_stashpv ("IO::AIO", 1);
369	croak ("unable to initialize result pipe");	940	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		941	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		942	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
370		943
371	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	944	create_pipe ();
372	croak ("cannot set result pipe to nonblocking mode");	945	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
373
374	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
375	croak ("cannot set result pipe to nonblocking mode");
376	}	946	}
377		947
378	void	948	void
379	min_parallel(nthreads)	949	min_parallel (nthreads)
380	int nthreads	950	int nthreads
381	PROTOTYPE: $	951	PROTOTYPE: $
382	CODE:
383	while (nthreads > started)
384	start_thread ();
385		952
386	void	953	void
387	max_parallel(nthreads)	954	max_parallel (nthreads)
388	int nthreads	955	int nthreads
389	PROTOTYPE: $	956	PROTOTYPE: $
390	CODE:
391	{
392	int cur = started;
393	while (cur > nthreads)
394	{
395	end_thread ();
396	cur--;
397	}
398
399	while (started > nthreads)
400	{
401	poll_wait ();
402	poll_cb ();
403	}
404	}
405		957
406	int	958	int
407	max_outstanding(nreqs)	959	max_outstanding (nreqs)
408	int nreqs	960	int nreqs
409	PROTOTYPE: $	961	PROTOTYPE: $
410	CODE:	962	CODE:
411	RETVAL = max_outstanding;	963	RETVAL = max_outstanding;
412	max_outstanding = nreqs;	964	max_outstanding = nreqs;
413		965
414	void	966	void
415	aio_open(pathname,flags,mode,callback)	967	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
416	SV * pathname	968	SV * pathname
417	int flags	969	int flags
418	int mode	970	int mode
419	SV * callback	971	SV * callback
420	PROTOTYPE: $$$$	972	PROTOTYPE: $$$;$
421	CODE:	973	PPCODE:
422	{	974	{
423	aio_req req;	975	dREQ;
424
425	Newz (0, req, 1, aio_cb);
426
427	if (!req)
428	croak ("out of memory during aio_req allocation");
429		976
430	req->type = REQ_OPEN;	977	req->type = REQ_OPEN;
431	req->data = newSVsv (pathname);	978	req->data = newSVsv (pathname);
432	req->dataptr = SvPV_nolen (req->data);	979	req->dataptr = SvPVbyte_nolen (req->data);
433	req->fd = flags;	980	req->fd = flags;
434	req->mode = mode;	981	req->mode = mode;
435	req->callback = SvREFCNT_inc (callback);
436		982
437	send_req (req);	983	REQ_SEND;
438	}	984	}
439		985
440	void	986	void
441	aio_close(fh,callback)	987	aio_close (fh,callback=&PL_sv_undef)
442	InputStream fh	988	SV * fh
443	SV * callback	989	SV * callback
444	PROTOTYPE: $$	990	PROTOTYPE: $;$
445	ALIAS:	991	ALIAS:
446	aio_close = REQ_CLOSE	992	aio_close = REQ_CLOSE
447	aio_fsync = REQ_FSYNC	993	aio_fsync = REQ_FSYNC
448	aio_fdatasync = REQ_FDATASYNC	994	aio_fdatasync = REQ_FDATASYNC
449	CODE:	995	PPCODE:
		996	{
		997	dREQ;
		998
		999	req->type = ix;
		1000	req->fh = newSVsv (fh);
		1001	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
		1002
		1003	REQ_SEND (req);
		1004	}
		1005
		1006	void
		1007	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
		1008	SV * fh
		1009	UV offset
		1010	UV length
		1011	SV * data
		1012	UV dataoffset
		1013	SV * callback
		1014	ALIAS:
		1015	aio_read = REQ_READ
		1016	aio_write = REQ_WRITE
		1017	PROTOTYPE: $$$$$;$
		1018	PPCODE:
450	{	1019	{
451	aio_req req;	1020	aio_req req;
		1021	STRLEN svlen;
		1022	char *svptr = SvPVbyte (data, svlen);
452		1023
453	Newz (0, req, 1, aio_cb);	1024	SvUPGRADE (data, SVt_PV);
		1025	SvPOK_on (data);
454		1026
455	if (!req)	1027	if (dataoffset < 0)
456	croak ("out of memory during aio_req allocation");	1028	dataoffset += svlen;
457		1029
458	req->type = ix;	1030	if (dataoffset < 0 || dataoffset > svlen)
459	req->fd = PerlIO_fileno (fh);	1031	croak ("data offset outside of string");
460	req->callback = SvREFCNT_inc (callback);
461		1032
462	send_req (req);	1033	if (ix == REQ_WRITE)
463	}	1034	{
464		1035	/* write: check length and adjust. */
465	void	1036	if (length < 0 || length + dataoffset > svlen)
466	aio_read(fh,offset,length,data,dataoffset,callback)	1037	length = svlen - dataoffset;
467	InputStream fh	1038	}
468	UV offset	1039	else
469	IV length	1040	{
470	SV * data	1041	/* read: grow scalar as necessary */
471	IV dataoffset	1042	svptr = SvGROW (data, length + dataoffset);
472	SV * callback	1043	}
473	PROTOTYPE: $$$$$$
474	CODE:
475	read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
476
477	void
478	aio_write(fh,offset,length,data,dataoffset,callback)
479	OutputStream fh
480	UV offset
481	IV length
482	SV * data
483	IV dataoffset
484	SV * callback
485	PROTOTYPE: $$$$$$
486	CODE:
487	read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
488
489	void
490	aio_readahead(fh,offset,length,callback)
491	InputStream fh
492	UV offset
493	IV length
494	SV * callback
495	PROTOTYPE: $$$$
496	CODE:
497	{
498	aio_req req;
499		1044
500	if (length < 0)	1045	if (length < 0)
501	croak ("length must not be negative");	1046	croak ("length must not be negative");
502		1047
503	Newz (0, req, 1, aio_cb);	1048	{
		1049	dREQ;
504		1050
505	if (!req)	1051	req->type = ix;
506	croak ("out of memory during aio_req allocation");	1052	req->fh = newSVsv (fh);
		1053	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
		1054	: IoOFP (sv_2io (fh)));
		1055	req->offset = offset;
		1056	req->length = length;
		1057	req->data = SvREFCNT_inc (data);
		1058	req->dataptr = (char *)svptr + dataoffset;
		1059
		1060	if (!SvREADONLY (data))
		1061	{
		1062	SvREADONLY_on (data);
		1063	req->data2ptr = (void *)data;
		1064	}
		1065
		1066	REQ_SEND;
		1067	}
		1068	}
		1069
		1070	void
		1071	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1072	SV * out_fh
		1073	SV * in_fh
		1074	UV in_offset
		1075	UV length
		1076	SV * callback
		1077	PROTOTYPE: $$$$;$
		1078	PPCODE:
		1079	{
		1080	dREQ;
		1081
		1082	req->type = REQ_SENDFILE;
		1083	req->fh = newSVsv (out_fh);
		1084	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1085	req->fh2 = newSVsv (in_fh);
		1086	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1087	req->offset = in_offset;
		1088	req->length = length;
		1089
		1090	REQ_SEND;
		1091	}
		1092
		1093	void
		1094	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
		1095	SV * fh
		1096	UV offset
		1097	IV length
		1098	SV * callback
		1099	PROTOTYPE: $$$;$
		1100	PPCODE:
		1101	{
		1102	dREQ;
507		1103
508	req->type = REQ_READAHEAD;	1104	req->type = REQ_READAHEAD;
		1105	req->fh = newSVsv (fh);
509	req->fd = PerlIO_fileno (fh);	1106	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
510	req->offset = offset;	1107	req->offset = offset;
511	req->length = length;	1108	req->length = length;
512	req->callback = SvREFCNT_inc (callback);
513		1109
514	send_req (req);	1110	REQ_SEND;
515	}	1111	}
516		1112
517	void	1113	void
518	aio_stat(fh_or_path,callback)	1114	aio_stat (fh_or_path,callback=&PL_sv_undef)
519	SV * fh_or_path	1115	SV * fh_or_path
520	SV * callback	1116	SV * callback
521	PROTOTYPE: $$
522	ALIAS:	1117	ALIAS:
		1118	aio_stat = REQ_STAT
523	aio_lstat = 1	1119	aio_lstat = REQ_LSTAT
524	CODE:	1120	PPCODE:
525	{	1121	{
526	aio_req req;	1122	dREQ;
527
528	Newz (0, req, 1, aio_cb);
529
530	if (!req)
531	croak ("out of memory during aio_req allocation");
532		1123
533	New (0, req->statdata, 1, Stat_t);	1124	New (0, req->statdata, 1, Stat_t);
534
535	if (!req->statdata)	1125	if (!req->statdata)
		1126	{
		1127	req_free (req);
536	croak ("out of memory during aio_req->statdata allocation");	1128	croak ("out of memory during aio_req->statdata allocation");
		1129	}
537		1130
538	if (SvPOK (fh_or_path))	1131	if (SvPOK (fh_or_path))
539	{	1132	{
540	req->type = ix ? REQ_LSTAT : REQ_STAT;	1133	req->type = ix;
541	req->data = newSVsv (fh_or_path);	1134	req->data = newSVsv (fh_or_path);
542	req->dataptr = SvPV_nolen (req->data);	1135	req->dataptr = SvPVbyte_nolen (req->data);
543	}	1136	}
544	else	1137	else
545	{	1138	{
546	req->type = REQ_FSTAT;	1139	req->type = REQ_FSTAT;
		1140	req->fh = newSVsv (fh_or_path);
547	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1141	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
548	}	1142	}
549		1143
550	req->callback = SvREFCNT_inc (callback);	1144	REQ_SEND;
551
552	send_req (req);
553	}	1145	}
554		1146
555	void	1147	void
556	aio_unlink(pathname,callback)	1148	aio_unlink (pathname,callback=&PL_sv_undef)
557	SV * pathname	1149	SV * pathname
558	SV * callback	1150	SV * callback
559	PROTOTYPE: $$	1151	ALIAS:
		1152	aio_unlink = REQ_UNLINK
		1153	aio_rmdir = REQ_RMDIR
		1154	aio_readdir = REQ_READDIR
560	CODE:	1155	PPCODE:
561	{	1156	{
562	aio_req req;	1157	dREQ;
563		1158
564	Newz (0, req, 1, aio_cb);	1159	req->type = ix;
		1160	req->data = newSVsv (pathname);
		1161	req->dataptr = SvPVbyte_nolen (req->data);
565		1162
566	if (!req)	1163	REQ_SEND;
567	croak ("out of memory during aio_req allocation");	1164	}
		1165
		1166	void
		1167	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1168	SV * oldpath
		1169	SV * newpath
		1170	SV * callback
		1171	ALIAS:
		1172	aio_link = REQ_LINK
		1173	aio_symlink = REQ_SYMLINK
		1174	aio_rename = REQ_RENAME
		1175	PPCODE:
		1176	{
		1177	dREQ;
568		1178
569	req->type = REQ_UNLINK;	1179	req->type = ix;
		1180	req->fh = newSVsv (oldpath);
		1181	req->data2ptr = SvPVbyte_nolen (req->fh);
570	req->data = newSVsv (pathname);	1182	req->data = newSVsv (newpath);
571	req->dataptr = SvPV_nolen (req->data);	1183	req->dataptr = SvPVbyte_nolen (req->data);
572	req->callback = SvREFCNT_inc (callback);
573		1184
574	send_req (req);	1185	REQ_SEND;
575	}	1186	}
576		1187
577	void	1188	void
		1189	aio_sleep (delay,callback=&PL_sv_undef)
		1190	double delay
		1191	SV * callback
		1192	PPCODE:
		1193	{
		1194	dREQ;
		1195
		1196	req->type = REQ_SLEEP;
		1197	req->fd = delay < 0. ? 0 : delay;
		1198	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1199
		1200	REQ_SEND;
		1201	}
		1202
		1203	void
		1204	aio_group (callback=&PL_sv_undef)
		1205	SV * callback
		1206	PROTOTYPE: ;$
		1207	PPCODE:
		1208	{
		1209	dREQ;
		1210	req->type = REQ_GROUP;
		1211	req_send (req);
		1212	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1213	}
		1214
		1215	void
578	flush()	1216	flush ()
579	PROTOTYPE:	1217	PROTOTYPE:
580	CODE:	1218	CODE:
581	while (nreqs)	1219	while (nreqs)
582	{	1220	{
583	poll_wait ();	1221	poll_wait ();
…		…
623	CODE:	1261	CODE:
624	RETVAL = nreqs;	1262	RETVAL = nreqs;
625	OUTPUT:	1263	OUTPUT:
626	RETVAL	1264	RETVAL
627		1265
		1266	PROTOTYPES: DISABLE
		1267
		1268	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1269
		1270	void
		1271	cancel (aio_req_ornot req)
		1272	PROTOTYPE:
		1273	CODE:
		1274	req_cancel (req);
		1275
		1276	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1277
		1278	void
		1279	add (aio_req grp, ...)
		1280	PPCODE:
		1281	{
		1282	int i;
		1283
		1284	if (grp->fd == 2)
		1285	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1286
		1287	for (i = 1; i < items; ++i )
		1288	{
		1289	if (GIMME_V != G_VOID)
		1290	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1291
		1292	aio_req req = SvAIO_REQ (ST (i));
		1293
		1294	if (req)
		1295	{
		1296	++grp->length;
		1297	req->grp = grp;
		1298
		1299	req->grp_prev = 0;
		1300	req->grp_next = grp->grp_first;
		1301
		1302	if (grp->grp_first)
		1303	grp->grp_first->grp_prev = req;
		1304
		1305	grp->grp_first = req;
		1306	}
		1307	}
		1308	}
		1309
		1310	void
		1311	result (aio_req grp, ...)
		1312	CODE:
		1313	{
		1314	int i;
		1315	AV *av = newAV ();
		1316
		1317	for (i = 1; i < items; ++i )
		1318	av_push (av, newSVsv (ST (i)));
		1319
		1320	SvREFCNT_dec (grp->data);
		1321	grp->data = (SV *)av;
		1322	}
		1323
		1324	void
		1325	lock (aio_req grp)
		1326	CODE:
		1327	++grp->length;
		1328
		1329	void
		1330	unlock (aio_req grp)
		1331	CODE:
		1332	aio_grp_dec (grp);
		1333
		1334	void
		1335	feeder_limit (aio_req grp, int limit)
		1336	CODE:
		1337	grp->fd2 = limit;
		1338	aio_grp_feed (grp);
		1339
		1340	void
		1341	set_feeder (aio_req grp, SV *callback=&PL_sv_undef)
		1342	CODE:
		1343	{
		1344	SvREFCNT_dec (grp->fh2);
		1345	grp->fh2 = newSVsv (callback);
		1346
		1347	if (grp->fd2 <= 0)
		1348	grp->fd2 = 2;
		1349
		1350	aio_grp_feed (grp);
		1351	}
		1352

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