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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.19 by root, Sun Jul 31 19:04:45 2005 UTC vs.
Revision 1.52 by root, Sun Oct 22 22:14:54 2006 UTC

1	#ifndef _REENTRANT
2	# define _REENTRANT 1	1	#define _REENTRANT 1
3	#endif
4	#include <errno.h>	2	#include <errno.h>
5		3
6	#include "EXTERN.h"	4	#include "EXTERN.h"
7	#include "perl.h"	5	#include "perl.h"
8	#include "XSUB.h"	6	#include "XSUB.h"
9		7
10	#include "autoconf/config.h"	8	#include "autoconf/config.h"
11		9
		10	#include <pthread.h>
		11
		12	#include <stddef.h>
		13	#include <errno.h>
		14	#include <sys/time.h>
		15	#include <sys/select.h>
12	#include <sys/types.h>	16	#include <sys/types.h>
13	#include <sys/stat.h>	17	#include <sys/stat.h>
14		18	#include <limits.h>
15	#include <unistd.h>	19	#include <unistd.h>
16	#include <fcntl.h>	20	#include <fcntl.h>
17	#include <signal.h>	21	#include <signal.h>
18	#include <sched.h>	22	#include <sched.h>
19		23
20	#include <pthread.h>	24	#if HAVE_SENDFILE
		25	# if __linux
		26	# include <sys/sendfile.h>
		27	# elif __freebsd
		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
21		38
22	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	39	/* used for struct dirent, AIX doesn't provide it */
23	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	40	#ifndef NAME_MAX
24	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	41	# define NAME_MAX 4096
		42	#endif
25		43
26	#if __ia64	44	#if __ia64
27	# define STACKSIZE 65536	45	# define STACKSIZE 65536
28	#else	46	#else
29	# define STACKSIZE 4096	47	# define STACKSIZE 8192
30	#endif	48	#endif
31		49
32	enum {	50	enum {
33	REQ_QUIT,	51	REQ_QUIT,
34	REQ_OPEN, REQ_CLOSE,	52	REQ_OPEN, REQ_CLOSE,
35	REQ_READ, REQ_WRITE, REQ_READAHEAD,	53	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		54	REQ_SENDFILE,
36	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
37	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,
38	};	62	};
39		63
		64	#define AIO_REQ_KLASS "IO::AIO::REQ"
		65	#define AIO_GRP_KLASS "IO::AIO::GRP"
		66
40	typedef struct aio_cb {	67	typedef struct aio_cb
		68	{
41	struct aio_cb *volatile next;	69	struct aio_cb *volatile next;
42		70
43	int type;	71	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
44		72
45	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;
46	off_t offset;	79	off_t offset;
47	size_t length;	80	size_t length;
48	ssize_t result;	81	ssize_t result;
		82
		83	int type;
		84	int fd, fd2;
		85	int errorno;
		86	STRLEN dataoffset;
49	mode_t mode; /* open */	87	mode_t mode; /* open */
50	int errorno;	88	unsigned char cancelled;
51	SV *data, *callback, *fh;
52	void *dataptr;
53	STRLEN dataoffset;
54
55	Stat_t *statdata;
56	} aio_cb;	89	} aio_cb;
57		90
58	typedef aio_cb *aio_req;	91	typedef aio_cb *aio_req;
		92	typedef aio_cb *aio_req_ornot;
59		93
60	static int started;	94	static int started, wanted;
61	static volatile int nreqs;	95	static volatile int nreqs;
62	static int max_outstanding = 1<<30;	96	static int max_outstanding = 1<<30;
63	static int respipe [2];	97	static int respipe [2];
64		98
65	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	99	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
…		…
67	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	101	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
68		102
69	static volatile aio_req reqs, reqe; /* queue start, queue end */	103	static volatile aio_req reqs, reqe; /* queue start, queue end */
70	static volatile aio_req ress, rese; /* queue start, queue end */	104	static volatile aio_req ress, rese; /* queue start, queue end */
71		105
72	static void	106	static void req_invoke (aio_req req);
73	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)
		111	{
		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 ()
74	{	178	{
75	if (nreqs && !ress)	179	if (nreqs && !ress)
76	{	180	{
77	fd_set rfd;	181	fd_set rfd;
78	FD_ZERO(&rfd);	182	FD_ZERO(&rfd);
…		…
80		184
81	select (respipe [0] + 1, &rfd, 0, 0, 0);	185	select (respipe [0] + 1, &rfd, 0, 0, 0);
82	}	186	}
83	}	187	}
84		188
85	static int	189	static void req_invoke (aio_req req)
86	poll_cb ()	190	{
		191	dSP;
		192	int errorno = errno;
		193
		194	if (req->cancelled || !SvOK (req->callback))
		195	return;
		196
		197	errno = req->errorno;
		198
		199	ENTER;
		200	SAVETMPS;
		201	PUSHMARK (SP);
		202	EXTEND (SP, 1);
		203
		204	switch (req->type)
		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 ()
87	{	335	{
88	dSP;	336	dSP;
89	int count = 0;	337	int count = 0;
		338	int do_croak = 0;
90	aio_req req, prv;	339	aio_req req;
91		340
		341	for (;;)
		342	{
92	pthread_mutex_lock (&reslock);	343	pthread_mutex_lock (&reslock);
		344	req = ress;
93		345
94	{	346	if (req)
		347	{
		348	ress = req->next;
		349
		350	if (!ress)
		351	{
95	/* read any signals sent by the worker threads */	352	/* read any signals sent by the worker threads */
96	char buf [32];	353	char buf [32];
97	while (read (respipe [0], buf, 32) > 0)	354	while (read (respipe [0], buf, 32) == 32)
		355	;
		356
		357	rese = 0;
		358	}
98	;	359	}
99	}
100		360
101	req = ress;
102	ress = rese = 0;
103
104	pthread_mutex_unlock (&reslock);	361	pthread_mutex_unlock (&reslock);
105		362
106	while (req)	363	if (!req)
107	{	364	break;
		365
108	nreqs--;	366	--nreqs;
109		367
110	if (req->type == REQ_QUIT)	368	if (req->type == REQ_QUIT)
111	started--;	369	started--;
		370	else if (req->type == REQ_GROUP && req->length)
		371	{
		372	req->fd = 1; /* mark request as delayed */
		373	continue;
		374	}
112	else	375	else
113	{	376	{
114	int errorno = errno;
115	errno = req->errorno;
116
117	if (req->type == REQ_READ)	377	if (req->type == REQ_READ)
118	SvCUR_set (req->data, req->dataoffset	378	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
119	+ req->result > 0 ? req->result : 0);
120		379
		380	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		381	SvREADONLY_off (req->data);
		382
121	if (req->data)	383	if (req->statdata)
122	SvREFCNT_dec (req->data);
123
124	if (req->fh)
125	SvREFCNT_dec (req->fh);
126
127	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
128	{	384	{
129	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	385	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
130	PL_laststatval = req->result;	386	PL_laststatval = req->result;
131	PL_statcache = *(req->statdata);	387	PL_statcache = *(req->statdata);
132
133	Safefree (req->statdata);
134	}	388	}
135		389
136	ENTER;	390	req_invoke (req);
137	PUSHMARK (SP);
138	XPUSHs (sv_2mortal (newSViv (req->result)));
139		391
140	if (req->type == REQ_OPEN)
141	{
142	/* convert fd to fh */
143	SV *fh;
144
145	PUTBACK;
146	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
147	SPAGAIN;
148
149	fh = SvREFCNT_inc (POPs);
150
151	PUSHMARK (SP);
152	XPUSHs (sv_2mortal (fh));
153	}
154
155	if (SvOK (req->callback))
156	{
157	PUTBACK;
158	call_sv (req->callback, G_VOID | G_EVAL);
159	SPAGAIN;
160	}
161
162	LEAVE;
163
164	if (req->callback)
165	SvREFCNT_dec (req->callback);
166
167	errno = errorno;
168	count++;	392	count++;
169	}	393	}
170		394
171	prv = req;
172	req = req->next;
173	Safefree (prv);	395	req_free (req);
174
175	/* TODO: croak on errors? */
176	}	396	}
177		397
178	return count;	398	return count;
179	}	399	}
180		400
181	static void *aio_proc(void *arg);	401	static void *aio_proc(void *arg);
182		402
183	static void
184	start_thread (void)	403	static void start_thread (void)
185	{	404	{
186	sigset_t fullsigset, oldsigset;	405	sigset_t fullsigset, oldsigset;
187	pthread_t tid;	406	pthread_t tid;
188	pthread_attr_t attr;	407	pthread_attr_t attr;
189		408
…		…
198	started++;	417	started++;
199		418
200	sigprocmask (SIG_SETMASK, &oldsigset, 0);	419	sigprocmask (SIG_SETMASK, &oldsigset, 0);
201	}	420	}
202		421
203	static void	422	static void req_send (aio_req req)
204	send_req (aio_req req)
205	{	423	{
		424	while (started < wanted && nreqs >= started)
		425	start_thread ();
		426
206	nreqs++;	427	++nreqs;
207		428
208	pthread_mutex_lock (&reqlock);	429	pthread_mutex_lock (&reqlock);
209		430
210	req->next = 0;	431	req->next = 0;
211		432
…		…
218	reqe = reqs = req;	439	reqe = reqs = req;
219		440
220	pthread_cond_signal (&reqwait);	441	pthread_cond_signal (&reqwait);
221	pthread_mutex_unlock (&reqlock);	442	pthread_mutex_unlock (&reqlock);
222		443
223	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)
224	{	485	{
225	poll_wait ();	486	poll_wait ();
226	poll_cb ();	487	poll_cb ();
227	}	488	}
228	}	489	}
229		490
230	static void	491	static void create_pipe ()
231	end_thread (void)
232	{	492	{
233	aio_req req;	493	if (pipe (respipe))
234	New (0, req, 1, aio_cb);	494	croak ("unable to initialize result pipe");
235	req->type = REQ_QUIT;
236		495
237	send_req (req);	496	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
238	}	497	croak ("cannot set result pipe to nonblocking mode");
239		498
		499	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		500	croak ("cannot set result pipe to nonblocking mode");
		501	}
		502
		503	/*****************************************************************************/
240	/* work around various missing functions */	504	/* work around various missing functions */
241		505
242	#if !HAVE_PREADWRITE	506	#if !HAVE_PREADWRITE
243	# define pread aio_pread	507	# define pread aio_pread
244	# define pwrite aio_pwrite	508	# define pwrite aio_pwrite
…		…
246	/*	510	/*
247	* make our pread/pwrite safe against themselves, but not against	511	* make our pread/pwrite safe against themselves, but not against
248	* normal read/write by using a mutex. slows down execution a lot,	512	* normal read/write by using a mutex. slows down execution a lot,
249	* but that's your problem, not mine.	513	* but that's your problem, not mine.
250	*/	514	*/
251	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	515	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
252		516
253	static ssize_t	517	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
254	pread (int fd, void *buf, size_t count, off_t offset)
255	{	518	{
256	ssize_t res;	519	ssize_t res;
257	off_t ooffset;	520	off_t ooffset;
258		521
259	pthread_mutex_lock (&iolock);	522	pthread_mutex_lock (&preadwritelock);
260	ooffset = lseek (fd, 0, SEEK_CUR);	523	ooffset = lseek (fd, 0, SEEK_CUR);
261	lseek (fd, offset, SEEK_SET);	524	lseek (fd, offset, SEEK_SET);
262	res = read (fd, buf, count);	525	res = read (fd, buf, count);
263	lseek (fd, ooffset, SEEK_SET);	526	lseek (fd, ooffset, SEEK_SET);
264	pthread_mutex_unlock (&iolock);	527	pthread_mutex_unlock (&preadwritelock);
265		528
266	return res;	529	return res;
267	}	530	}
268		531
269	static ssize_t
270	pwrite (int fd, void *buf, size_t count, off_t offset)	532	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
271	{	533	{
272	ssize_t res;	534	ssize_t res;
273	off_t ooffset;	535	off_t ooffset;
274		536
275	pthread_mutex_lock (&iolock);	537	pthread_mutex_lock (&preadwritelock);
276	ooffset = lseek (fd, 0, SEEK_CUR);	538	ooffset = lseek (fd, 0, SEEK_CUR);
277	lseek (fd, offset, SEEK_SET);	539	lseek (fd, offset, SEEK_SET);
278	res = write (fd, buf, count);	540	res = write (fd, buf, count);
279	lseek (fd, offset, SEEK_SET);	541	lseek (fd, offset, SEEK_SET);
280	pthread_mutex_unlock (&iolock);	542	pthread_mutex_unlock (&preadwritelock);
281		543
282	return res;	544	return res;
283	}	545	}
284	#endif	546	#endif
285		547
…		…
288	#endif	550	#endif
289		551
290	#if !HAVE_READAHEAD	552	#if !HAVE_READAHEAD
291	# define readahead aio_readahead	553	# define readahead aio_readahead
292		554
		555	static ssize_t readahead (int fd, off_t offset, size_t count)
		556	{
293	static char readahead_buf[4096];	557	char readahead_buf[4096];
294		558
295	static ssize_t
296	readahead (int fd, off_t offset, size_t count)
297	{
298	while (count > 0)	559	while (count > 0)
299	{	560	{
300	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	561	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
301		562
302	pread (fd, readahead_buf, len, offset);	563	pread (fd, readahead_buf, len, offset);
…		…
306		567
307	errno = 0;	568	errno = 0;
308	}	569	}
309	#endif	570	#endif
310		571
311	static void *	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);
		591	}
		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	*/
		619	{
		620	off_t sbytes;
		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	)
		660	{
		661	/* emulate sendfile. this is a major pain in the ass */
		662	char buf[4096];
		663	res = 0;
		664
		665	while (count)
		666	{
		667	ssize_t cnt;
		668
		669	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
		670
		671	if (cnt <= 0)
		672	{
		673	if (cnt && !res) res = -1;
		674	break;
		675	}
		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
		710	if (!dirp)
		711	return -1;
		712
		713	names = malloc (memlen);
		714
		715	for (;;)
		716	{
		717	errno = 0, readdir_r (dirp, &u.d, &entp);
		718
		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
312	aio_proc (void *thr_arg)	759	static void *aio_proc (void *thr_arg)
313	{	760	{
314	aio_req req;	761	aio_req req;
315	int type;	762	int type;
316		763
317	do	764	do
…		…
336		783
337	pthread_mutex_unlock (&reqlock);	784	pthread_mutex_unlock (&reqlock);
338		785
339	errno = 0; /* strictly unnecessary */	786	errno = 0; /* strictly unnecessary */
340		787
341	type = req->type;	788	if (!req->cancelled)
342		789	switch (type = req->type) /* remember type for QUIT check */
343	switch (type)
344	{	790	{
345	case REQ_READ: req->result = pread (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;
346	case REQ_WRITE: req->result = pwrite (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;
347		793
348	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;
		795	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
349		796
350	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	797	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
351	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	798	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
352	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	799	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
353		800
354	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;
355	case REQ_CLOSE: req->result = close (req->fd); break;	802	case REQ_CLOSE: req->result = close (req->fd); break;
356	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	803	case REQ_UNLINK: req->result = unlink (req->dataptr); 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;
357		808
358	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	809	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
359	case REQ_FSYNC: req->result = fsync (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;
360		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
361	case REQ_QUIT:	823	case REQ_QUIT:
362	break;	824	break;
363		825
364	default:	826	default:
365	req->result = ENOSYS;	827	req->result = ENOSYS;
366	break;	828	break;
367	}	829	}
368		830
369	req->errorno = errno;	831	req->errorno = errno;
370		832
371	pthread_mutex_lock (&reslock);	833	pthread_mutex_lock (&reslock);
372		834
…		…
390	while (type != REQ_QUIT);	852	while (type != REQ_QUIT);
391		853
392	return 0;	854	return 0;
393	}	855	}
394		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
395	MODULE = IO::AIO PACKAGE = IO::AIO	932	MODULE = IO::AIO PACKAGE = IO::AIO
396		933
397	PROTOTYPES: ENABLE	934	PROTOTYPES: ENABLE
398		935
399	BOOT:	936	BOOT:
400	{	937	{
401	if (pipe (respipe))	938	HV *stash = gv_stashpv ("IO::AIO", 1);
402	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));
403		942
404	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	943	create_pipe ();
405	croak ("cannot set result pipe to nonblocking mode");	944	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
406
407	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
408	croak ("cannot set result pipe to nonblocking mode");
409	}	945	}
410		946
411	void	947	void
412	min_parallel(nthreads)	948	min_parallel (nthreads)
413	int nthreads	949	int nthreads
414	PROTOTYPE: $	950	PROTOTYPE: $
415	CODE:
416	while (nthreads > started)
417	start_thread ();
418		951
419	void	952	void
420	max_parallel(nthreads)	953	max_parallel (nthreads)
421	int nthreads	954	int nthreads
422	PROTOTYPE: $	955	PROTOTYPE: $
423	CODE:
424	{
425	int cur = started;
426	while (cur > nthreads)
427	{
428	end_thread ();
429	cur--;
430	}
431
432	while (started > nthreads)
433	{
434	poll_wait ();
435	poll_cb ();
436	}
437	}
438		956
439	int	957	int
440	max_outstanding(nreqs)	958	max_outstanding (nreqs)
441	int nreqs	959	int nreqs
442	PROTOTYPE: $	960	PROTOTYPE: $
443	CODE:	961	CODE:
444	RETVAL = max_outstanding;	962	RETVAL = max_outstanding;
445	max_outstanding = nreqs;	963	max_outstanding = nreqs;
446		964
447	void	965	void
448	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	966	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
449	SV * pathname	967	SV * pathname
450	int flags	968	int flags
451	int mode	969	int mode
452	SV * callback	970	SV * callback
453	PROTOTYPE: $$$;$	971	PROTOTYPE: $$$;$
454	CODE:	972	PPCODE:
455	{	973	{
456	aio_req req;	974	dREQ;
457
458	Newz (0, req, 1, aio_cb);
459
460	if (!req)
461	croak ("out of memory during aio_req allocation");
462		975
463	req->type = REQ_OPEN;	976	req->type = REQ_OPEN;
464	req->data = newSVsv (pathname);	977	req->data = newSVsv (pathname);
465	req->dataptr = SvPV_nolen (req->data);	978	req->dataptr = SvPVbyte_nolen (req->data);
466	req->fd = flags;	979	req->fd = flags;
467	req->mode = mode;	980	req->mode = mode;
468	req->callback = SvREFCNT_inc (callback);
469		981
470	send_req (req);	982	REQ_SEND;
471	}	983	}
472		984
473	void	985	void
474	aio_close(fh,callback=&PL_sv_undef)	986	aio_close (fh,callback=&PL_sv_undef)
475	SV * fh	987	SV * fh
476	SV * callback	988	SV * callback
477	PROTOTYPE: $;$	989	PROTOTYPE: $;$
478	ALIAS:	990	ALIAS:
479	aio_close = REQ_CLOSE	991	aio_close = REQ_CLOSE
480	aio_fsync = REQ_FSYNC	992	aio_fsync = REQ_FSYNC
481	aio_fdatasync = REQ_FDATASYNC	993	aio_fdatasync = REQ_FDATASYNC
482	CODE:	994	PPCODE:
483	{	995	{
484	aio_req req;	996	dREQ;
485
486	Newz (0, req, 1, aio_cb);
487
488	if (!req)
489	croak ("out of memory during aio_req allocation");
490		997
491	req->type = ix;	998	req->type = ix;
492	req->fh = newSVsv (fh);	999	req->fh = newSVsv (fh);
493	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1000	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
494	req->callback = SvREFCNT_inc (callback);
495		1001
496	send_req (req);	1002	REQ_SEND (req);
497	}	1003	}
498		1004
499	void	1005	void
500	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1006	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
501	SV * fh	1007	SV * fh
502	UV offset	1008	UV offset
503	IV length	1009	UV length
504	SV * data	1010	SV * data
505	IV dataoffset	1011	UV dataoffset
506	SV * callback	1012	SV * callback
507	ALIAS:	1013	ALIAS:
508	aio_read = REQ_READ	1014	aio_read = REQ_READ
509	aio_write = REQ_WRITE	1015	aio_write = REQ_WRITE
510	PROTOTYPE: $$$$$;$	1016	PROTOTYPE: $$$$$;$
511	CODE:	1017	PPCODE:
512	{	1018	{
513	aio_req req;	1019	aio_req req;
514	STRLEN svlen;	1020	STRLEN svlen;
515	char *svptr = SvPV (data, svlen);	1021	char *svptr = SvPVbyte (data, svlen);
516		1022
517	SvUPGRADE (data, SVt_PV);	1023	SvUPGRADE (data, SVt_PV);
518	SvPOK_on (data);	1024	SvPOK_on (data);
519		1025
520	if (dataoffset < 0)	1026	if (dataoffset < 0)
…		…
536	}	1042	}
537		1043
538	if (length < 0)	1044	if (length < 0)
539	croak ("length must not be negative");	1045	croak ("length must not be negative");
540		1046
541	Newz (0, req, 1, aio_cb);	1047	{
		1048	dREQ;
542		1049
543	if (!req)
544	croak ("out of memory during aio_req allocation");
545
546	req->type = ix;	1050	req->type = ix;
547	req->fh = newSVsv (fh);	1051	req->fh = newSVsv (fh);
548	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1052	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
549	: IoOFP (sv_2io (fh)));	1053	: IoOFP (sv_2io (fh)));
550	req->offset = offset;	1054	req->offset = offset;
		1055	req->length = length;
		1056	req->data = SvREFCNT_inc (data);
		1057	req->dataptr = (char *)svptr + dataoffset;
		1058
		1059	if (!SvREADONLY (data))
		1060	{
		1061	SvREADONLY_on (data);
		1062	req->data2ptr = (void *)data;
		1063	}
		1064
		1065	REQ_SEND;
		1066	}
		1067	}
		1068
		1069	void
		1070	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1071	SV * out_fh
		1072	SV * in_fh
		1073	UV in_offset
		1074	UV length
		1075	SV * callback
		1076	PROTOTYPE: $$$$;$
		1077	PPCODE:
		1078	{
		1079	dREQ;
		1080
		1081	req->type = REQ_SENDFILE;
		1082	req->fh = newSVsv (out_fh);
		1083	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1084	req->fh2 = newSVsv (in_fh);
		1085	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1086	req->offset = in_offset;
551	req->length = length;	1087	req->length = length;
552	req->data = SvREFCNT_inc (data);
553	req->dataptr = (char *)svptr + dataoffset;
554	req->callback = SvREFCNT_inc (callback);
555		1088
556	send_req (req);	1089	REQ_SEND;
557	}	1090	}
558		1091
559	void	1092	void
560	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1093	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
561	SV * fh	1094	SV * fh
562	UV offset	1095	UV offset
563	IV length	1096	IV length
564	SV * callback	1097	SV * callback
565	PROTOTYPE: $$$;$	1098	PROTOTYPE: $$$;$
566	CODE:	1099	PPCODE:
567	{	1100	{
568	aio_req req;	1101	dREQ;
569
570	if (length < 0)
571	croak ("length must not be negative");
572
573	Newz (0, req, 1, aio_cb);
574
575	if (!req)
576	croak ("out of memory during aio_req allocation");
577		1102
578	req->type = REQ_READAHEAD;	1103	req->type = REQ_READAHEAD;
579	req->fh = newSVsv (fh);	1104	req->fh = newSVsv (fh);
580	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1105	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
581	req->offset = offset;	1106	req->offset = offset;
582	req->length = length;	1107	req->length = length;
583	req->callback = SvREFCNT_inc (callback);
584		1108
585	send_req (req);	1109	REQ_SEND;
586	}	1110	}
587		1111
588	void	1112	void
589	aio_stat(fh_or_path,callback=&PL_sv_undef)	1113	aio_stat (fh_or_path,callback=&PL_sv_undef)
590	SV * fh_or_path	1114	SV * fh_or_path
591	SV * callback	1115	SV * callback
592	ALIAS:	1116	ALIAS:
593	aio_stat = REQ_STAT	1117	aio_stat = REQ_STAT
594	aio_lstat = REQ_LSTAT	1118	aio_lstat = REQ_LSTAT
595	CODE:	1119	PPCODE:
596	{	1120	{
597	aio_req req;	1121	dREQ;
598
599	Newz (0, req, 1, aio_cb);
600
601	if (!req)
602	croak ("out of memory during aio_req allocation");
603		1122
604	New (0, req->statdata, 1, Stat_t);	1123	New (0, req->statdata, 1, Stat_t);
605
606	if (!req->statdata)	1124	if (!req->statdata)
		1125	{
		1126	req_free (req);
607	croak ("out of memory during aio_req->statdata allocation");	1127	croak ("out of memory during aio_req->statdata allocation");
		1128	}
608		1129
609	if (SvPOK (fh_or_path))	1130	if (SvPOK (fh_or_path))
610	{	1131	{
611	req->type = ix;	1132	req->type = ix;
612	req->data = newSVsv (fh_or_path);	1133	req->data = newSVsv (fh_or_path);
613	req->dataptr = SvPV_nolen (req->data);	1134	req->dataptr = SvPVbyte_nolen (req->data);
614	}	1135	}
615	else	1136	else
616	{	1137	{
617	req->type = REQ_FSTAT;	1138	req->type = REQ_FSTAT;
618	req->fh = newSVsv (fh_or_path);	1139	req->fh = newSVsv (fh_or_path);
619	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1140	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
620	}	1141	}
621		1142
622	req->callback = SvREFCNT_inc (callback);	1143	REQ_SEND;
623
624	send_req (req);
625	}	1144	}
626		1145
627	void	1146	void
628	aio_unlink(pathname,callback=&PL_sv_undef)	1147	aio_unlink (pathname,callback=&PL_sv_undef)
629	SV * pathname	1148	SV * pathname
630	SV * callback	1149	SV * callback
		1150	ALIAS:
		1151	aio_unlink = REQ_UNLINK
		1152	aio_rmdir = REQ_RMDIR
		1153	aio_readdir = REQ_READDIR
631	CODE:	1154	PPCODE:
632	{	1155	{
633	aio_req req;	1156	dREQ;
634		1157
635	Newz (0, req, 1, aio_cb);	1158	req->type = ix;
		1159	req->data = newSVsv (pathname);
		1160	req->dataptr = SvPVbyte_nolen (req->data);
636		1161
637	if (!req)	1162	REQ_SEND;
638	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;
639		1177
640	req->type = REQ_UNLINK;	1178	req->type = ix;
		1179	req->fh = newSVsv (oldpath);
		1180	req->data2ptr = SvPVbyte_nolen (req->fh);
641	req->data = newSVsv (pathname);	1181	req->data = newSVsv (newpath);
642	req->dataptr = SvPV_nolen (req->data);	1182	req->dataptr = SvPVbyte_nolen (req->data);
643	req->callback = SvREFCNT_inc (callback);
644		1183
645	send_req (req);	1184	REQ_SEND;
646	}	1185	}
647		1186
648	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
649	flush()	1215	flush ()
650	PROTOTYPE:	1216	PROTOTYPE:
651	CODE:	1217	CODE:
652	while (nreqs)	1218	while (nreqs)
653	{	1219	{
654	poll_wait ();	1220	poll_wait ();
…		…
694	CODE:	1260	CODE:
695	RETVAL = nreqs;	1261	RETVAL = nreqs;
696	OUTPUT:	1262	OUTPUT:
697	RETVAL	1263	RETVAL
698		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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