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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.24 by root, Wed Aug 17 03:01:56 2005 UTC vs.
Revision 1.53 by root, Mon Oct 23 00:17:07 2006 UTC

…		…
5	#include "perl.h"	5	#include "perl.h"
6	#include "XSUB.h"	6	#include "XSUB.h"
7		7
8	#include "autoconf/config.h"	8	#include "autoconf/config.h"
9		9
		10	#include <pthread.h>
		11
		12	#include <stddef.h>
		13	#include <errno.h>
		14	#include <sys/time.h>
		15	#include <sys/select.h>
10	#include <sys/types.h>	16	#include <sys/types.h>
11	#include <sys/stat.h>	17	#include <sys/stat.h>
12		18	#include <limits.h>
13	#include <unistd.h>	19	#include <unistd.h>
14	#include <fcntl.h>	20	#include <fcntl.h>
15	#include <signal.h>	21	#include <signal.h>
16	#include <sched.h>	22	#include <sched.h>
17		23
18	#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
19		38
20	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	39	/* used for struct dirent, AIX doesn't provide it */
21	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	40	#ifndef NAME_MAX
22	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	41	# define NAME_MAX 4096
		42	#endif
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,	55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35	REQ_FSYNC, REQ_FDATASYNC,	56	REQ_FSYNC, REQ_FDATASYNC,
36	REQ_UNLINK, REQ_RMDIR,	57	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
37	REQ_SYMLINK,	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, *data2ptr;
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;
66	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	100	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
67	static pthread_mutex_t frklock = PTHREAD_MUTEX_INITIALIZER;
68	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	101	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
69		102
70	static volatile aio_req reqs, reqe; /* queue start, queue end */	103	static volatile aio_req reqs, reqe; /* queue start, queue end */
71	static volatile aio_req ress, rese; /* queue start, queue end */	104	static volatile aio_req ress, rese; /* queue start, queue end */
72		105
73	static void	106	static void req_invoke (aio_req req);
74	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	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 ()
75	{	180	{
76	if (nreqs && !ress)	181	if (nreqs && !ress)
77	{	182	{
78	fd_set rfd;	183	fd_set rfd;
79	FD_ZERO(&rfd);	184	FD_ZERO(&rfd);
…		…
81		186
82	select (respipe [0] + 1, &rfd, 0, 0, 0);	187	select (respipe [0] + 1, &rfd, 0, 0, 0);
83	}	188	}
84	}	189	}
85		190
86	static int	191	static void req_invoke (aio_req req)
87	poll_cb ()	192	{
		193	dSP;
		194	int errorno = errno;
		195
		196	if (req->cancelled || !SvOK (req->callback))
		197	return;
		198
		199	errno = req->errorno;
		200
		201	ENTER;
		202	SAVETMPS;
		203	PUSHMARK (SP);
		204	EXTEND (SP, 1);
		205
		206	switch (req->type)
		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 ()
88	{	337	{
89	dSP;	338	dSP;
90	int count = 0;	339	int count = 0;
91	int do_croak = 0;	340	int do_croak = 0;
92	aio_req req, prv;	341	aio_req req;
93		342
		343	for (;;)
		344	{
94	pthread_mutex_lock (&reslock);	345	pthread_mutex_lock (&reslock);
		346	req = ress;
95		347
96	{	348	if (req)
		349	{
		350	ress = req->next;
		351
		352	if (!ress)
		353	{
97	/* read any signals sent by the worker threads */	354	/* read any signals sent by the worker threads */
98	char buf [32];	355	char buf [32];
99	while (read (respipe [0], buf, 32) == 32)	356	while (read (respipe [0], buf, 32) == 32)
		357	;
		358
		359	rese = 0;
		360	}
100	;	361	}
101	}
102		362
103	req = ress;
104	ress = rese = 0;
105
106	pthread_mutex_unlock (&reslock);	363	pthread_mutex_unlock (&reslock);
107		364
108	while (req)	365	if (!req)
109	{	366	break;
		367
110	nreqs--;	368	--nreqs;
111		369
112	if (req->type == REQ_QUIT)	370	if (req->type == REQ_QUIT)
113	started--;	371	started--;
		372	else if (req->type == REQ_GROUP && req->length)
		373	{
		374	req->fd = 1; /* mark request as delayed */
		375	continue;
		376	}
114	else	377	else
115	{	378	{
116	int errorno = errno;
117	errno = req->errorno;
118
119	if (req->type == REQ_READ)	379	if (req->type == REQ_READ)
120	SvCUR_set (req->data, req->dataoffset	380	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
121	+ req->result > 0 ? req->result : 0);
122		381
		382	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		383	SvREADONLY_off (req->data);
		384
123	if (req->data)	385	if (req->statdata)
124	SvREFCNT_dec (req->data);
125
126	if (req->fh)
127	SvREFCNT_dec (req->fh);
128
129	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
130	{	386	{
131	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	387	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
132	PL_laststatval = req->result;	388	PL_laststatval = req->result;
133	PL_statcache = *(req->statdata);	389	PL_statcache = *(req->statdata);
134
135	Safefree (req->statdata);
136	}	390	}
137		391
138	ENTER;	392	req_invoke (req);
139	PUSHMARK (SP);
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 = SvREFCNT_inc (POPs);
152
153	PUSHMARK (SP);
154	XPUSHs (sv_2mortal (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	do_croak = SvTRUE (ERRSV);
165
166	LEAVE;
167
168	if (req->callback)
169	SvREFCNT_dec (req->callback);
170
171	errno = errorno;
172	count++;	394	count++;
173	}	395	}
174		396
175	prv = req;
176	req = req->next;
177	Safefree (prv);	397	req_free (req);
178
179	if (do_croak)
180	croak (0);
181	}	398	}
182		399
183	return count;	400	return count;
184	}	401	}
185		402
186	static void *aio_proc(void *arg);	403	static void *aio_proc(void *arg);
187		404
188	static void
189	start_thread (void)	405	static void start_thread (void)
190	{	406	{
191	sigset_t fullsigset, oldsigset;	407	sigset_t fullsigset, oldsigset;
192	pthread_t tid;	408	pthread_t tid;
193	pthread_attr_t attr;	409	pthread_attr_t attr;
194		410
…		…
203	started++;	419	started++;
204		420
205	sigprocmask (SIG_SETMASK, &oldsigset, 0);	421	sigprocmask (SIG_SETMASK, &oldsigset, 0);
206	}	422	}
207		423
208	static void	424	static void req_send (aio_req req)
209	send_req (aio_req req)
210	{	425	{
		426	while (started < wanted && nreqs >= started)
		427	start_thread ();
		428
211	nreqs++;	429	++nreqs;
212		430
213	pthread_mutex_lock (&reqlock);	431	pthread_mutex_lock (&reqlock);
214		432
215	req->next = 0;	433	req->next = 0;
216		434
…		…
223	reqe = reqs = req;	441	reqe = reqs = req;
224		442
225	pthread_cond_signal (&reqwait);	443	pthread_cond_signal (&reqwait);
226	pthread_mutex_unlock (&reqlock);	444	pthread_mutex_unlock (&reqlock);
227		445
228	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)
229	{	487	{
230	poll_wait ();	488	poll_wait ();
231	poll_cb ();	489	poll_cb ();
232	}	490	}
233	}	491	}
234		492
235	static void	493	static void create_pipe ()
236	end_thread (void)
237	{	494	{
238	aio_req req;	495	if (pipe (respipe))
239	New (0, req, 1, aio_cb);	496	croak ("unable to initialize result pipe");
240	req->type = REQ_QUIT;
241		497
242	send_req (req);	498	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
243	}	499	croak ("cannot set result pipe to nonblocking mode");
244		500
245		501	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
246	static void min_parallel (int nthreads)	502	croak ("cannot set result pipe to nonblocking mode");
247	{
248	while (nthreads > started)
249	start_thread ();
250	}
251
252	static void max_parallel (int nthreads)
253	{
254	int cur = started;
255	while (cur > nthreads)
256	{
257	end_thread ();
258	cur--;
259	}
260
261	while (started > nthreads)
262	{
263	poll_wait ();
264	poll_cb ();
265	}
266	}
267
268	static int fork_started;
269
270	static void atfork_prepare (void)
271	{
272	pthread_mutex_lock (&frklock);
273
274	fork_started = started;
275
276	for (;;) {
277	while (nreqs)
278	{
279	poll_wait ();
280	poll_cb ();
281	}
282
283	max_parallel (0);
284
285	pthread_mutex_lock (&reqlock);
286
287	if (!nreqs && !started)
288	break;
289
290	pthread_mutex_unlock (&reqlock);
291
292	min_parallel (fork_started);
293	}
294
295	pthread_mutex_lock (&reslock);
296
297	assert (!started);
298	assert (!nreqs);
299	assert (!reqs && !reqe);
300	assert (!ress && !rese);
301	}
302
303	static void atfork_parent (void)
304	{
305	pthread_mutex_unlock (&reslock);
306	min_parallel (fork_started);
307	pthread_mutex_unlock (&reqlock);
308	pthread_mutex_unlock (&frklock);
309	}
310
311	static void atfork_child (void)
312	{
313	reqs = reqe = 0;
314
315	atfork_parent ();
316	}	503	}
317		504
318	/*****************************************************************************/	505	/*****************************************************************************/
319	/* work around various missing functions */	506	/* work around various missing functions */
320		507
…		…
325	/*	512	/*
326	* make our pread/pwrite safe against themselves, but not against	513	* make our pread/pwrite safe against themselves, but not against
327	* normal read/write by using a mutex. slows down execution a lot,	514	* normal read/write by using a mutex. slows down execution a lot,
328	* but that's your problem, not mine.	515	* but that's your problem, not mine.
329	*/	516	*/
330	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	517	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
331		518
332	static ssize_t	519	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
333	pread (int fd, void *buf, size_t count, off_t offset)
334	{	520	{
335	ssize_t res;	521	ssize_t res;
336	off_t ooffset;	522	off_t ooffset;
337		523
338	pthread_mutex_lock (&iolock);	524	pthread_mutex_lock (&preadwritelock);
339	ooffset = lseek (fd, 0, SEEK_CUR);	525	ooffset = lseek (fd, 0, SEEK_CUR);
340	lseek (fd, offset, SEEK_SET);	526	lseek (fd, offset, SEEK_SET);
341	res = read (fd, buf, count);	527	res = read (fd, buf, count);
342	lseek (fd, ooffset, SEEK_SET);	528	lseek (fd, ooffset, SEEK_SET);
343	pthread_mutex_unlock (&iolock);	529	pthread_mutex_unlock (&preadwritelock);
344		530
345	return res;	531	return res;
346	}	532	}
347		533
348	static ssize_t
349	pwrite (int fd, void *buf, size_t count, off_t offset)	534	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
350	{	535	{
351	ssize_t res;	536	ssize_t res;
352	off_t ooffset;	537	off_t ooffset;
353		538
354	pthread_mutex_lock (&iolock);	539	pthread_mutex_lock (&preadwritelock);
355	ooffset = lseek (fd, 0, SEEK_CUR);	540	ooffset = lseek (fd, 0, SEEK_CUR);
356	lseek (fd, offset, SEEK_SET);	541	lseek (fd, offset, SEEK_SET);
357	res = write (fd, buf, count);	542	res = write (fd, buf, count);
358	lseek (fd, offset, SEEK_SET);	543	lseek (fd, offset, SEEK_SET);
359	pthread_mutex_unlock (&iolock);	544	pthread_mutex_unlock (&preadwritelock);
360		545
361	return res;	546	return res;
362	}	547	}
363	#endif	548	#endif
364		549
…		…
367	#endif	552	#endif
368		553
369	#if !HAVE_READAHEAD	554	#if !HAVE_READAHEAD
370	# define readahead aio_readahead	555	# define readahead aio_readahead
371		556
		557	static ssize_t readahead (int fd, off_t offset, size_t count)
		558	{
372	static char readahead_buf[4096];	559	char readahead_buf[4096];
373		560
374	static ssize_t
375	readahead (int fd, off_t offset, size_t count)
376	{
377	while (count > 0)	561	while (count > 0)
378	{	562	{
379	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	563	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
380		564
381	pread (fd, readahead_buf, len, offset);	565	pread (fd, readahead_buf, len, offset);
…		…
385		569
386	errno = 0;	570	errno = 0;
387	}	571	}
388	#endif	572	#endif
389		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);
		593	}
		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	*/
		621	{
		622	off_t sbytes;
		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	)
		662	{
		663	/* emulate sendfile. this is a major pain in the ass */
		664	char buf[4096];
		665	res = 0;
		666
		667	while (count)
		668	{
		669	ssize_t cnt;
		670
		671	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
		672
		673	if (cnt <= 0)
		674	{
		675	if (cnt && !res) res = -1;
		676	break;
		677	}
		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
		712	if (!dirp)
		713	return -1;
		714
		715	names = malloc (memlen);
		716
		717	for (;;)
		718	{
		719	errno = 0, readdir_r (dirp, &u.d, &entp);
		720
		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
390	/*****************************************************************************/	759	/*****************************************************************************/
391		760
392	static void *
393	aio_proc (void *thr_arg)	761	static void *aio_proc (void *thr_arg)
394	{	762	{
395	aio_req req;	763	aio_req req;
396	int type;	764	int type;
397		765
398	do	766	do
…		…
417		785
418	pthread_mutex_unlock (&reqlock);	786	pthread_mutex_unlock (&reqlock);
419		787
420	errno = 0; /* strictly unnecessary */	788	errno = 0; /* strictly unnecessary */
421		789
422	type = req->type;	790	if (!req->cancelled)
423		791	switch (type = req->type) /* remember type for QUIT check */
424	switch (type)
425	{	792	{
426	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;
427	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;
428		795
429	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;
		797	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
430		798
431	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	799	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
432	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	800	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
433	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	801	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
434		802
435	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;
436	case REQ_CLOSE: req->result = close (req->fd); break;	804	case REQ_CLOSE: req->result = close (req->fd); break;
437	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	805	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
438	case REQ_RMDIR: req->result = rmdir (req->dataptr); 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;
439	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	809	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
440		810
441	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	811	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
442	case REQ_FSYNC: req->result = fsync (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;
443		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
444	case REQ_QUIT:	825	case REQ_QUIT:
445	break;	826	break;
446		827
447	default:	828	default:
448	req->result = ENOSYS;	829	req->result = ENOSYS;
449	break;	830	break;
450	}	831	}
451		832
452	req->errorno = errno;	833	req->errorno = errno;
453		834
454	pthread_mutex_lock (&reslock);	835	pthread_mutex_lock (&reslock);
455		836
…		…
473	while (type != REQ_QUIT);	854	while (type != REQ_QUIT);
474		855
475	return 0;	856	return 0;
476	}	857	}
477		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
478	#define dREQ \	916	#define dREQ \
479	aio_req req; \	917	aio_req req; \
480	\	918	\
481	if (SvOK (callback) && !SvROK (callback)) \	919	if (SvOK (callback) && !SvROK (callback)) \
482	croak ("clalback must be undef or of reference type"); \	920	croak ("callback must be undef or of reference type"); \
483	\	921	\
484	Newz (0, req, 1, aio_cb); \	922	Newz (0, req, 1, aio_cb); \
485	if (!req) \	923	if (!req) \
486	croak ("out of memory during aio_req allocation"); \	924	croak ("out of memory during aio_req allocation"); \
487	\	925	\
488	req->callback = SvREFCNT_inc (callback);	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));
489		933
490	MODULE = IO::AIO PACKAGE = IO::AIO	934	MODULE = IO::AIO PACKAGE = IO::AIO
491		935
492	PROTOTYPES: ENABLE	936	PROTOTYPES: ENABLE
493		937
494	BOOT:	938	BOOT:
495	{	939	{
496	if (pipe (respipe))	940	HV *stash = gv_stashpv ("IO::AIO", 1);
497	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));
498		944
499	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	945	create_pipe ();
500	croak ("cannot set result pipe to nonblocking mode");
501
502	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
503	croak ("cannot set result pipe to nonblocking mode");
504
505	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	946	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
506	}	947	}
507		948
508	void	949	void
509	min_parallel(nthreads)	950	min_parallel (nthreads)
510	int nthreads	951	int nthreads
511	PROTOTYPE: $	952	PROTOTYPE: $
512		953
513	void	954	void
514	max_parallel(nthreads)	955	max_parallel (nthreads)
515	int nthreads	956	int nthreads
516	PROTOTYPE: $	957	PROTOTYPE: $
517		958
518	int	959	int
519	max_outstanding(nreqs)	960	max_outstanding (nreqs)
520	int nreqs	961	int nreqs
521	PROTOTYPE: $	962	PROTOTYPE: $
522	CODE:	963	CODE:
523	RETVAL = max_outstanding;	964	RETVAL = max_outstanding;
524	max_outstanding = nreqs;	965	max_outstanding = nreqs;
525		966
526	void	967	void
527	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	968	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
528	SV * pathname	969	SV * pathname
529	int flags	970	int flags
530	int mode	971	int mode
531	SV * callback	972	SV * callback
532	PROTOTYPE: $$$;$	973	PROTOTYPE: $$$;$
533	CODE:	974	PPCODE:
534	{	975	{
535	dREQ;	976	dREQ;
536		977
537	req->type = REQ_OPEN;	978	req->type = REQ_OPEN;
538	req->data = newSVsv (pathname);	979	req->data = newSVsv (pathname);
539	req->dataptr = SvPVbyte_nolen (req->data);	980	req->dataptr = SvPVbyte_nolen (req->data);
540	req->fd = flags;	981	req->fd = flags;
541	req->mode = mode;	982	req->mode = mode;
542		983
543	send_req (req);	984	REQ_SEND;
544	}	985	}
545		986
546	void	987	void
547	aio_close(fh,callback=&PL_sv_undef)	988	aio_close (fh,callback=&PL_sv_undef)
548	SV * fh	989	SV * fh
549	SV * callback	990	SV * callback
550	PROTOTYPE: $;$	991	PROTOTYPE: $;$
551	ALIAS:	992	ALIAS:
552	aio_close = REQ_CLOSE	993	aio_close = REQ_CLOSE
553	aio_fsync = REQ_FSYNC	994	aio_fsync = REQ_FSYNC
554	aio_fdatasync = REQ_FDATASYNC	995	aio_fdatasync = REQ_FDATASYNC
555	CODE:	996	PPCODE:
556	{	997	{
557	dREQ;	998	dREQ;
558		999
559	req->type = ix;	1000	req->type = ix;
560	req->fh = newSVsv (fh);	1001	req->fh = newSVsv (fh);
561	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1002	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
562		1003
563	send_req (req);	1004	REQ_SEND (req);
564	}	1005	}
565		1006
566	void	1007	void
567	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1008	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
568	SV * fh	1009	SV * fh
569	UV offset	1010	UV offset
570	IV length	1011	UV length
571	SV * data	1012	SV * data
572	IV dataoffset	1013	UV dataoffset
573	SV * callback	1014	SV * callback
574	ALIAS:	1015	ALIAS:
575	aio_read = REQ_READ	1016	aio_read = REQ_READ
576	aio_write = REQ_WRITE	1017	aio_write = REQ_WRITE
577	PROTOTYPE: $$$$$;$	1018	PROTOTYPE: $$$$$;$
578	CODE:	1019	PPCODE:
579	{	1020	{
580	aio_req req;	1021	aio_req req;
581	STRLEN svlen;	1022	STRLEN svlen;
582	char *svptr = SvPVbyte (data, svlen);	1023	char *svptr = SvPVbyte (data, svlen);
583		1024
…		…
614	: IoOFP (sv_2io (fh)));	1055	: IoOFP (sv_2io (fh)));
615	req->offset = offset;	1056	req->offset = offset;
616	req->length = length;	1057	req->length = length;
617	req->data = SvREFCNT_inc (data);	1058	req->data = SvREFCNT_inc (data);
618	req->dataptr = (char *)svptr + dataoffset;	1059	req->dataptr = (char *)svptr + dataoffset;
619	req->callback = SvREFCNT_inc (callback);
620		1060
621	send_req (req);	1061	if (!SvREADONLY (data))
		1062	{
		1063	SvREADONLY_on (data);
		1064	req->data2ptr = (void *)data;
		1065	}
		1066
		1067	REQ_SEND;
622	}	1068	}
623	}	1069	}
624		1070
625	void	1071	void
		1072	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1073	SV * out_fh
		1074	SV * in_fh
		1075	UV in_offset
		1076	UV length
		1077	SV * callback
		1078	PROTOTYPE: $$$$;$
		1079	PPCODE:
		1080	{
		1081	dREQ;
		1082
		1083	req->type = REQ_SENDFILE;
		1084	req->fh = newSVsv (out_fh);
		1085	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1086	req->fh2 = newSVsv (in_fh);
		1087	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1088	req->offset = in_offset;
		1089	req->length = length;
		1090
		1091	REQ_SEND;
		1092	}
		1093
		1094	void
626	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1095	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
627	SV * fh	1096	SV * fh
628	UV offset	1097	UV offset
629	IV length	1098	IV length
630	SV * callback	1099	SV * callback
631	PROTOTYPE: $$$;$	1100	PROTOTYPE: $$$;$
632	CODE:	1101	PPCODE:
633	{	1102	{
634	dREQ;	1103	dREQ;
635		1104
636	req->type = REQ_READAHEAD;	1105	req->type = REQ_READAHEAD;
637	req->fh = newSVsv (fh);	1106	req->fh = newSVsv (fh);
638	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1107	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
639	req->offset = offset;	1108	req->offset = offset;
640	req->length = length;	1109	req->length = length;
641		1110
642	send_req (req);	1111	REQ_SEND;
643	}	1112	}
644		1113
645	void	1114	void
646	aio_stat(fh_or_path,callback=&PL_sv_undef)	1115	aio_stat (fh_or_path,callback=&PL_sv_undef)
647	SV * fh_or_path	1116	SV * fh_or_path
648	SV * callback	1117	SV * callback
649	ALIAS:	1118	ALIAS:
650	aio_stat = REQ_STAT	1119	aio_stat = REQ_STAT
651	aio_lstat = REQ_LSTAT	1120	aio_lstat = REQ_LSTAT
652	CODE:	1121	PPCODE:
653	{	1122	{
654	dREQ;	1123	dREQ;
655		1124
656	New (0, req->statdata, 1, Stat_t);	1125	New (0, req->statdata, 1, Stat_t);
657	if (!req->statdata)	1126	if (!req->statdata)
		1127	{
		1128	req_free (req);
658	croak ("out of memory during aio_req->statdata allocation (sorry, i just leaked memory, too)");	1129	croak ("out of memory during aio_req->statdata allocation");
		1130	}
659		1131
660	if (SvPOK (fh_or_path))	1132	if (SvPOK (fh_or_path))
661	{	1133	{
662	req->type = ix;	1134	req->type = ix;
663	req->data = newSVsv (fh_or_path);	1135	req->data = newSVsv (fh_or_path);
…		…
668	req->type = REQ_FSTAT;	1140	req->type = REQ_FSTAT;
669	req->fh = newSVsv (fh_or_path);	1141	req->fh = newSVsv (fh_or_path);
670	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1142	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
671	}	1143	}
672		1144
673	send_req (req);	1145	REQ_SEND;
674	}	1146	}
675		1147
676	void	1148	void
677	aio_unlink(pathname,callback=&PL_sv_undef)	1149	aio_unlink (pathname,callback=&PL_sv_undef)
678	SV * pathname	1150	SV * pathname
679	SV * callback	1151	SV * callback
680	ALIAS:	1152	ALIAS:
681	aio_unlink = REQ_UNLINK	1153	aio_unlink = REQ_UNLINK
682	aio_rmdir = REQ_RMDIR	1154	aio_rmdir = REQ_RMDIR
		1155	aio_readdir = REQ_READDIR
683	CODE:	1156	PPCODE:
684	{	1157	{
685	dREQ;	1158	dREQ;
686		1159
687	req->type = ix;	1160	req->type = ix;
688	req->data = newSVsv (pathname);	1161	req->data = newSVsv (pathname);
689	req->dataptr = SvPVbyte_nolen (req->data);	1162	req->dataptr = SvPVbyte_nolen (req->data);
690		1163
691	send_req (req);	1164	REQ_SEND;
692	}	1165	}
693		1166
694	void	1167	void
695	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1168	aio_link (oldpath,newpath,callback=&PL_sv_undef)
696	SV * oldpath	1169	SV * oldpath
697	SV * newpath	1170	SV * newpath
698	SV * callback	1171	SV * callback
		1172	ALIAS:
		1173	aio_link = REQ_LINK
		1174	aio_symlink = REQ_SYMLINK
		1175	aio_rename = REQ_RENAME
699	CODE:	1176	PPCODE:
700	{	1177	{
701	dREQ;	1178	dREQ;
702		1179
703	req->type = REQ_SYMLINK;	1180	req->type = ix;
704	req->fh = newSVsv (oldpath);	1181	req->fh = newSVsv (oldpath);
705	req->data2ptr = SvPVbyte_nolen (req->fh);	1182	req->data2ptr = SvPVbyte_nolen (req->fh);
706	req->data = newSVsv (newpath);	1183	req->data = newSVsv (newpath);
707	req->dataptr = SvPVbyte_nolen (req->data);	1184	req->dataptr = SvPVbyte_nolen (req->data);
708		1185
709	send_req (req);	1186	REQ_SEND;
710	}	1187	}
711		1188
712	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
713	flush()	1217	flush ()
714	PROTOTYPE:	1218	PROTOTYPE:
715	CODE:	1219	CODE:
716	while (nreqs)	1220	while (nreqs)
717	{	1221	{
718	poll_wait ();	1222	poll_wait ();
…		…
758	CODE:	1262	CODE:
759	RETVAL = nreqs;	1263	RETVAL = nreqs;
760	OUTPUT:	1264	OUTPUT:
761	RETVAL	1265	RETVAL
762		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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