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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 1.56 by root, Mon Oct 23 14:49:51 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_GROUP, REQ_NOP,
		61	REQ_SLEEP,
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_NOP:
		265	case REQ_SLEEP:
		266	break;
		267
		268	default:
		269	PUSHs (sv_2mortal (newSViv (req->result)));
		270	break;
		271	}
		272
		273
		274	PUTBACK;
		275	call_sv (req->callback, G_VOID | G_EVAL);
		276	SPAGAIN;
		277
		278	FREETMPS;
		279	LEAVE;
		280
		281	errno = errorno;
		282
		283	if (SvTRUE (ERRSV))
		284	{
		285	req_free (req);
		286	croak (0);
		287	}
		288	}
		289
		290	static void req_free (aio_req req)
		291	{
		292	if (req->grp)
		293	{
		294	aio_req grp = req->grp;
		295
		296	/* unlink request */
		297	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		298	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		299
		300	if (grp->grp_first == req)
		301	grp->grp_first = req->grp_next;
		302
		303	aio_grp_dec (grp);
		304	}
		305
		306	if (req->self)
		307	{
		308	sv_unmagic (req->self, PERL_MAGIC_ext);
		309	SvREFCNT_dec (req->self);
		310	}
		311
		312	SvREFCNT_dec (req->data);
		313	SvREFCNT_dec (req->fh);
		314	SvREFCNT_dec (req->fh2);
		315	SvREFCNT_dec (req->callback);
		316	Safefree (req->statdata);
		317
		318	if (req->type == REQ_READDIR && req->result >= 0)
		319	free (req->data2ptr);
		320
		321	Safefree (req);
		322	}
		323
		324	static void req_cancel (aio_req req)
		325	{
		326	req->cancelled = 1;
		327
		328	if (req->type == REQ_GROUP)
		329	{
		330	aio_req sub;
		331
		332	for (sub = req->grp_first; sub; sub = sub->grp_next)
		333	req_cancel (sub);
		334	}
		335	}
		336
		337	static int poll_cb ()
88	{	338	{
89	dSP;	339	dSP;
90	int count = 0;	340	int count = 0;
91	int do_croak = 0;	341	int do_croak = 0;
92	aio_req req, prv;	342	aio_req req;
93		343
		344	for (;;)
		345	{
94	pthread_mutex_lock (&reslock);	346	pthread_mutex_lock (&reslock);
		347	req = ress;
95		348
96	{	349	if (req)
		350	{
		351	ress = req->next;
		352
		353	if (!ress)
		354	{
97	/* read any signals sent by the worker threads */	355	/* read any signals sent by the worker threads */
98	char buf [32];	356	char buf [32];
99	while (read (respipe [0], buf, 32) == 32)	357	while (read (respipe [0], buf, 32) == 32)
		358	;
		359
		360	rese = 0;
		361	}
100	;	362	}
101	}
102		363
103	req = ress;
104	ress = rese = 0;
105
106	pthread_mutex_unlock (&reslock);	364	pthread_mutex_unlock (&reslock);
107		365
108	while (req)	366	if (!req)
109	{	367	break;
		368
110	nreqs--;	369	--nreqs;
111		370
112	if (req->type == REQ_QUIT)	371	if (req->type == REQ_QUIT)
113	started--;	372	started--;
		373	else if (req->type == REQ_GROUP && req->length)
		374	{
		375	req->fd = 1; /* mark request as delayed */
		376	continue;
		377	}
114	else	378	else
115	{	379	{
116	int errorno = errno;
117	errno = req->errorno;
118
119	if (req->type == REQ_READ)	380	if (req->type == REQ_READ)
120	SvCUR_set (req->data, req->dataoffset	381	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
121	+ req->result > 0 ? req->result : 0);
122		382
		383	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		384	SvREADONLY_off (req->data);
		385
123	if (req->data)	386	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	{	387	{
131	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	388	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
132	PL_laststatval = req->result;	389	PL_laststatval = req->result;
133	PL_statcache = *(req->statdata);	390	PL_statcache = *(req->statdata);
134
135	Safefree (req->statdata);
136	}	391	}
137		392
138	ENTER;	393	req_invoke (req);
139	PUSHMARK (SP);
140	XPUSHs (sv_2mortal (newSViv (req->result)));
141		394
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++;	395	count++;
173	}	396	}
174		397
175	prv = req;
176	req = req->next;
177	Safefree (prv);	398	req_free (req);
178
179	if (do_croak)
180	croak (0);
181	}	399	}
182		400
183	return count;	401	return count;
184	}	402	}
185		403
186	static void *aio_proc(void *arg);	404	static void *aio_proc(void *arg);
187		405
188	static void
189	start_thread (void)	406	static void start_thread (void)
190	{	407	{
191	sigset_t fullsigset, oldsigset;	408	sigset_t fullsigset, oldsigset;
192	pthread_t tid;	409	pthread_t tid;
193	pthread_attr_t attr;	410	pthread_attr_t attr;
194		411
…		…
203	started++;	420	started++;
204		421
205	sigprocmask (SIG_SETMASK, &oldsigset, 0);	422	sigprocmask (SIG_SETMASK, &oldsigset, 0);
206	}	423	}
207		424
208	static void	425	static void req_send (aio_req req)
209	send_req (aio_req req)
210	{	426	{
		427	while (started < wanted && nreqs >= started)
		428	start_thread ();
		429
211	nreqs++;	430	++nreqs;
212		431
213	pthread_mutex_lock (&reqlock);	432	pthread_mutex_lock (&reqlock);
214		433
215	req->next = 0;	434	req->next = 0;
216		435
…		…
223	reqe = reqs = req;	442	reqe = reqs = req;
224		443
225	pthread_cond_signal (&reqwait);	444	pthread_cond_signal (&reqwait);
226	pthread_mutex_unlock (&reqlock);	445	pthread_mutex_unlock (&reqlock);
227		446
228	while (nreqs > max_outstanding)	447	if (nreqs > max_outstanding)
		448	for (;;)
		449	{
		450	poll_cb ();
		451
		452	if (nreqs <= max_outstanding)
		453	break;
		454
		455	poll_wait ();
		456	}
		457	}
		458
		459	static void end_thread (void)
		460	{
		461	aio_req req;
		462	Newz (0, req, 1, aio_cb);
		463	req->type = REQ_QUIT;
		464
		465	req_send (req);
		466	}
		467
		468	static void min_parallel (int nthreads)
		469	{
		470	if (wanted < nthreads)
		471	wanted = nthreads;
		472	}
		473
		474	static void max_parallel (int nthreads)
		475	{
		476	int cur = started;
		477
		478	if (wanted > nthreads)
		479	wanted = nthreads;
		480
		481	while (cur > wanted)
		482	{
		483	end_thread ();
		484	cur--;
		485	}
		486
		487	while (started > wanted)
229	{	488	{
230	poll_wait ();	489	poll_wait ();
231	poll_cb ();	490	poll_cb ();
232	}	491	}
233	}	492	}
234		493
235	static void	494	static void create_pipe ()
236	end_thread (void)
237	{	495	{
238	aio_req req;	496	if (pipe (respipe))
239	New (0, req, 1, aio_cb);	497	croak ("unable to initialize result pipe");
240	req->type = REQ_QUIT;
241		498
242	send_req (req);	499	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
243	}	500	croak ("cannot set result pipe to nonblocking mode");
244		501
245		502	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
246	static void min_parallel (int nthreads)	503	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	}	504	}
317		505
318	/*****************************************************************************/	506	/*****************************************************************************/
319	/* work around various missing functions */	507	/* work around various missing functions */
320		508
…		…
325	/*	513	/*
326	* make our pread/pwrite safe against themselves, but not against	514	* make our pread/pwrite safe against themselves, but not against
327	* normal read/write by using a mutex. slows down execution a lot,	515	* normal read/write by using a mutex. slows down execution a lot,
328	* but that's your problem, not mine.	516	* but that's your problem, not mine.
329	*/	517	*/
330	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	518	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
331		519
332	static ssize_t	520	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	{	521	{
335	ssize_t res;	522	ssize_t res;
336	off_t ooffset;	523	off_t ooffset;
337		524
338	pthread_mutex_lock (&iolock);	525	pthread_mutex_lock (&preadwritelock);
339	ooffset = lseek (fd, 0, SEEK_CUR);	526	ooffset = lseek (fd, 0, SEEK_CUR);
340	lseek (fd, offset, SEEK_SET);	527	lseek (fd, offset, SEEK_SET);
341	res = read (fd, buf, count);	528	res = read (fd, buf, count);
342	lseek (fd, ooffset, SEEK_SET);	529	lseek (fd, ooffset, SEEK_SET);
343	pthread_mutex_unlock (&iolock);	530	pthread_mutex_unlock (&preadwritelock);
344		531
345	return res;	532	return res;
346	}	533	}
347		534
348	static ssize_t
349	pwrite (int fd, void *buf, size_t count, off_t offset)	535	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
350	{	536	{
351	ssize_t res;	537	ssize_t res;
352	off_t ooffset;	538	off_t ooffset;
353		539
354	pthread_mutex_lock (&iolock);	540	pthread_mutex_lock (&preadwritelock);
355	ooffset = lseek (fd, 0, SEEK_CUR);	541	ooffset = lseek (fd, 0, SEEK_CUR);
356	lseek (fd, offset, SEEK_SET);	542	lseek (fd, offset, SEEK_SET);
357	res = write (fd, buf, count);	543	res = write (fd, buf, count);
358	lseek (fd, offset, SEEK_SET);	544	lseek (fd, offset, SEEK_SET);
359	pthread_mutex_unlock (&iolock);	545	pthread_mutex_unlock (&preadwritelock);
360		546
361	return res;	547	return res;
362	}	548	}
363	#endif	549	#endif
364		550
…		…
367	#endif	553	#endif
368		554
369	#if !HAVE_READAHEAD	555	#if !HAVE_READAHEAD
370	# define readahead aio_readahead	556	# define readahead aio_readahead
371		557
		558	static ssize_t readahead (int fd, off_t offset, size_t count)
		559	{
372	static char readahead_buf[4096];	560	char readahead_buf[4096];
373		561
374	static ssize_t
375	readahead (int fd, off_t offset, size_t count)
376	{
377	while (count > 0)	562	while (count > 0)
378	{	563	{
379	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	564	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
380		565
381	pread (fd, readahead_buf, len, offset);	566	pread (fd, readahead_buf, len, offset);
…		…
385		570
386	errno = 0;	571	errno = 0;
387	}	572	}
388	#endif	573	#endif
389		574
		575	#if !HAVE_READDIR_R
		576	# define readdir_r aio_readdir_r
		577
		578	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		579
		580	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		581	{
		582	struct dirent *e;
		583	int errorno;
		584
		585	pthread_mutex_lock (&readdirlock);
		586
		587	e = readdir (dirp);
		588	errorno = errno;
		589
		590	if (e)
		591	{
		592	*res = ent;
		593	strcpy (ent->d_name, e->d_name);
		594	}
		595	else
		596	*res = 0;
		597
		598	pthread_mutex_unlock (&readdirlock);
		599
		600	errno = errorno;
		601	return e ? 0 : -1;
		602	}
		603	#endif
		604
		605	/* sendfile always needs emulation */
		606	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
		607	{
		608	ssize_t res;
		609
		610	if (!count)
		611	return 0;
		612
		613	#if HAVE_SENDFILE
		614	# if __linux
		615	res = sendfile (ofd, ifd, &offset, count);
		616
		617	# elif __freebsd
		618	/*
		619	* Of course, the freebsd sendfile is a dire hack with no thoughts
		620	* wasted on making it similar to other I/O functions.
		621	*/
		622	{
		623	off_t sbytes;
		624	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		625
		626	if (res < 0 && sbytes)
		627	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
		628	res = sbytes;
		629	}
		630
		631	# elif __hpux
		632	res = sendfile (ofd, ifd, offset, count, 0, 0);
		633
		634	# elif __solaris
		635	{
		636	struct sendfilevec vec;
		637	size_t sbytes;
		638
		639	vec.sfv_fd = ifd;
		640	vec.sfv_flag = 0;
		641	vec.sfv_off = offset;
		642	vec.sfv_len = count;
		643
		644	res = sendfilev (ofd, &vec, 1, &sbytes);
		645
		646	if (res < 0 && sbytes)
		647	res = sbytes;
		648	}
		649
		650	# endif
		651	#else
		652	res = -1;
		653	errno = ENOSYS;
		654	#endif
		655
		656	if (res < 0
		657	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		658	#if __solaris
		659	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		660	#endif
		661	)
		662	)
		663	{
		664	/* emulate sendfile. this is a major pain in the ass */
		665	char buf[4096];
		666	res = 0;
		667
		668	while (count)
		669	{
		670	ssize_t cnt;
		671
		672	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
		673
		674	if (cnt <= 0)
		675	{
		676	if (cnt && !res) res = -1;
		677	break;
		678	}
		679
		680	cnt = write (ofd, buf, cnt);
		681
		682	if (cnt <= 0)
		683	{
		684	if (cnt && !res) res = -1;
		685	break;
		686	}
		687
		688	offset += cnt;
		689	res += cnt;
		690	count -= cnt;
		691	}
		692	}
		693
		694	return res;
		695	}
		696
		697	/* read a full directory */
		698	static int scandir_ (const char *path, void **namesp)
		699	{
		700	DIR *dirp = opendir (path);
		701	union
		702	{
		703	struct dirent d;
		704	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		705	} u;
		706	struct dirent *entp;
		707	char *name, *names;
		708	int memlen = 4096;
		709	int memofs = 0;
		710	int res = 0;
		711	int errorno;
		712
		713	if (!dirp)
		714	return -1;
		715
		716	names = malloc (memlen);
		717
		718	for (;;)
		719	{
		720	errno = 0, readdir_r (dirp, &u.d, &entp);
		721
		722	if (!entp)
		723	break;
		724
		725	name = entp->d_name;
		726
		727	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		728	{
		729	int len = strlen (name) + 1;
		730
		731	res++;
		732
		733	while (memofs + len > memlen)
		734	{
		735	memlen *= 2;
		736	names = realloc (names, memlen);
		737	if (!names)
		738	break;
		739	}
		740
		741	memcpy (names + memofs, name, len);
		742	memofs += len;
		743	}
		744	}
		745
		746	errorno = errno;
		747	closedir (dirp);
		748
		749	if (errorno)
		750	{
		751	free (names);
		752	errno = errorno;
		753	res = -1;
		754	}
		755
		756	*namesp = (void *)names;
		757	return res;
		758	}
		759
390	/*****************************************************************************/	760	/*****************************************************************************/
391		761
392	static void *
393	aio_proc (void *thr_arg)	762	static void *aio_proc (void *thr_arg)
394	{	763	{
395	aio_req req;	764	aio_req req;
396	int type;	765	int type;
397		766
398	do	767	do
…		…
417		786
418	pthread_mutex_unlock (&reqlock);	787	pthread_mutex_unlock (&reqlock);
419		788
420	errno = 0; /* strictly unnecessary */	789	errno = 0; /* strictly unnecessary */
421		790
422	type = req->type;	791	if (!req->cancelled)
423		792	switch (type = req->type) /* remember type for QUIT check */
424	switch (type)
425	{	793	{
426	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	794	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;	795	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
428		796
429	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	797	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
		798	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
430		799
431	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	800	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
432	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	801	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
433	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	802	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
434		803
435	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	804	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
436	case REQ_CLOSE: req->result = close (req->fd); break;	805	case REQ_CLOSE: req->result = close (req->fd); break;
437	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	806	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
438	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	807	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		808	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		809	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
439	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	810	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
440		811
441	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	812	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
442	case REQ_FSYNC: req->result = fsync (req->fd); break;	813	case REQ_FSYNC: req->result = fsync (req->fd); break;
		814	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
443		815
		816	case REQ_SLEEP:
		817	{
		818	struct timeval tv;
		819
		820	tv.tv_sec = req->fd;
		821	tv.tv_usec = req->fd2;
		822
		823	req->result = select (0, 0, 0, 0, &tv);
		824	}
		825
		826	case REQ_GROUP:
		827	case REQ_NOP:
444	case REQ_QUIT:	828	case REQ_QUIT:
445	break;	829	break;
446		830
447	default:	831	default:
448	req->result = ENOSYS;	832	req->result = ENOSYS;
449	break;	833	break;
450	}	834	}
451		835
452	req->errorno = errno;	836	req->errorno = errno;
453		837
454	pthread_mutex_lock (&reslock);	838	pthread_mutex_lock (&reslock);
455		839
…		…
473	while (type != REQ_QUIT);	857	while (type != REQ_QUIT);
474		858
475	return 0;	859	return 0;
476	}	860	}
477		861
		862	/*****************************************************************************/
		863
		864	static void atfork_prepare (void)
		865	{
		866	pthread_mutex_lock (&reqlock);
		867	pthread_mutex_lock (&reslock);
		868	#if !HAVE_PREADWRITE
		869	pthread_mutex_lock (&preadwritelock);
		870	#endif
		871	#if !HAVE_READDIR_R
		872	pthread_mutex_lock (&readdirlock);
		873	#endif
		874	}
		875
		876	static void atfork_parent (void)
		877	{
		878	#if !HAVE_READDIR_R
		879	pthread_mutex_unlock (&readdirlock);
		880	#endif
		881	#if !HAVE_PREADWRITE
		882	pthread_mutex_unlock (&preadwritelock);
		883	#endif
		884	pthread_mutex_unlock (&reslock);
		885	pthread_mutex_unlock (&reqlock);
		886	}
		887
		888	static void atfork_child (void)
		889	{
		890	aio_req prv;
		891
		892	started = 0;
		893
		894	while (reqs)
		895	{
		896	prv = reqs;
		897	reqs = prv->next;
		898	req_free (prv);
		899	}
		900
		901	reqs = reqe = 0;
		902
		903	while (ress)
		904	{
		905	prv = ress;
		906	ress = prv->next;
		907	req_free (prv);
		908	}
		909
		910	ress = rese = 0;
		911
		912	close (respipe [0]);
		913	close (respipe [1]);
		914	create_pipe ();
		915
		916	atfork_parent ();
		917	}
		918
478	#define dREQ \	919	#define dREQ \
479	aio_req req; \	920	aio_req req; \
480	\	921	\
481	if (SvOK (callback) && !SvROK (callback)) \	922	if (SvOK (callback) && !SvROK (callback)) \
482	croak ("clalback must be undef or of reference type"); \	923	croak ("callback must be undef or of reference type"); \
483	\	924	\
484	Newz (0, req, 1, aio_cb); \	925	Newz (0, req, 1, aio_cb); \
485	if (!req) \	926	if (!req) \
486	croak ("out of memory during aio_req allocation"); \	927	croak ("out of memory during aio_req allocation"); \
487	\	928	\
488	req->callback = SvREFCNT_inc (callback);	929	req->callback = newSVsv (callback)
		930
		931	#define REQ_SEND \
		932	req_send (req); \
		933	\
		934	if (GIMME_V != G_VOID) \
		935	XPUSHs (req_sv (req, AIO_REQ_KLASS));
489		936
490	MODULE = IO::AIO PACKAGE = IO::AIO	937	MODULE = IO::AIO PACKAGE = IO::AIO
491		938
492	PROTOTYPES: ENABLE	939	PROTOTYPES: ENABLE
493		940
494	BOOT:	941	BOOT:
495	{	942	{
496	if (pipe (respipe))	943	HV *stash = gv_stashpv ("IO::AIO", 1);
497	croak ("unable to initialize result pipe");	944	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		945	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		946	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
498		947
499	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	948	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);	949	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
506	}	950	}
507		951
508	void	952	void
509	min_parallel(nthreads)	953	min_parallel (nthreads)
510	int nthreads	954	int nthreads
511	PROTOTYPE: $	955	PROTOTYPE: $
512		956
513	void	957	void
514	max_parallel(nthreads)	958	max_parallel (nthreads)
515	int nthreads	959	int nthreads
516	PROTOTYPE: $	960	PROTOTYPE: $
517		961
518	int	962	int
519	max_outstanding(nreqs)	963	max_outstanding (nreqs)
520	int nreqs	964	int nreqs
521	PROTOTYPE: $	965	PROTOTYPE: $
522	CODE:	966	CODE:
523	RETVAL = max_outstanding;	967	RETVAL = max_outstanding;
524	max_outstanding = nreqs;	968	max_outstanding = nreqs;
525		969
526	void	970	void
527	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	971	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
528	SV * pathname	972	SV * pathname
529	int flags	973	int flags
530	int mode	974	int mode
531	SV * callback	975	SV * callback
532	PROTOTYPE: $$$;$	976	PROTOTYPE: $$$;$
533	CODE:	977	PPCODE:
534	{	978	{
535	dREQ;	979	dREQ;
536		980
537	req->type = REQ_OPEN;	981	req->type = REQ_OPEN;
538	req->data = newSVsv (pathname);	982	req->data = newSVsv (pathname);
539	req->dataptr = SvPVbyte_nolen (req->data);	983	req->dataptr = SvPVbyte_nolen (req->data);
540	req->fd = flags;	984	req->fd = flags;
541	req->mode = mode;	985	req->mode = mode;
542		986
543	send_req (req);	987	REQ_SEND;
544	}	988	}
545		989
546	void	990	void
547	aio_close(fh,callback=&PL_sv_undef)	991	aio_close (fh,callback=&PL_sv_undef)
548	SV * fh	992	SV * fh
549	SV * callback	993	SV * callback
550	PROTOTYPE: $;$	994	PROTOTYPE: $;$
551	ALIAS:	995	ALIAS:
552	aio_close = REQ_CLOSE	996	aio_close = REQ_CLOSE
553	aio_fsync = REQ_FSYNC	997	aio_fsync = REQ_FSYNC
554	aio_fdatasync = REQ_FDATASYNC	998	aio_fdatasync = REQ_FDATASYNC
555	CODE:	999	PPCODE:
556	{	1000	{
557	dREQ;	1001	dREQ;
558		1002
559	req->type = ix;	1003	req->type = ix;
560	req->fh = newSVsv (fh);	1004	req->fh = newSVsv (fh);
561	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1005	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
562		1006
563	send_req (req);	1007	REQ_SEND (req);
564	}	1008	}
565		1009
566	void	1010	void
567	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1011	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
568	SV * fh	1012	SV * fh
569	UV offset	1013	UV offset
570	IV length	1014	UV length
571	SV * data	1015	SV * data
572	IV dataoffset	1016	UV dataoffset
573	SV * callback	1017	SV * callback
574	ALIAS:	1018	ALIAS:
575	aio_read = REQ_READ	1019	aio_read = REQ_READ
576	aio_write = REQ_WRITE	1020	aio_write = REQ_WRITE
577	PROTOTYPE: $$$$$;$	1021	PROTOTYPE: $$$$$;$
578	CODE:	1022	PPCODE:
579	{	1023	{
580	aio_req req;	1024	aio_req req;
581	STRLEN svlen;	1025	STRLEN svlen;
582	char *svptr = SvPVbyte (data, svlen);	1026	char *svptr = SvPVbyte (data, svlen);
583		1027
…		…
614	: IoOFP (sv_2io (fh)));	1058	: IoOFP (sv_2io (fh)));
615	req->offset = offset;	1059	req->offset = offset;
616	req->length = length;	1060	req->length = length;
617	req->data = SvREFCNT_inc (data);	1061	req->data = SvREFCNT_inc (data);
618	req->dataptr = (char *)svptr + dataoffset;	1062	req->dataptr = (char *)svptr + dataoffset;
619	req->callback = SvREFCNT_inc (callback);
620		1063
621	send_req (req);	1064	if (!SvREADONLY (data))
		1065	{
		1066	SvREADONLY_on (data);
		1067	req->data2ptr = (void *)data;
		1068	}
		1069
		1070	REQ_SEND;
622	}	1071	}
623	}	1072	}
624		1073
625	void	1074	void
		1075	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1076	SV * out_fh
		1077	SV * in_fh
		1078	UV in_offset
		1079	UV length
		1080	SV * callback
		1081	PROTOTYPE: $$$$;$
		1082	PPCODE:
		1083	{
		1084	dREQ;
		1085
		1086	req->type = REQ_SENDFILE;
		1087	req->fh = newSVsv (out_fh);
		1088	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1089	req->fh2 = newSVsv (in_fh);
		1090	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1091	req->offset = in_offset;
		1092	req->length = length;
		1093
		1094	REQ_SEND;
		1095	}
		1096
		1097	void
626	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1098	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
627	SV * fh	1099	SV * fh
628	UV offset	1100	UV offset
629	IV length	1101	IV length
630	SV * callback	1102	SV * callback
631	PROTOTYPE: $$$;$	1103	PROTOTYPE: $$$;$
632	CODE:	1104	PPCODE:
633	{	1105	{
634	dREQ;	1106	dREQ;
635		1107
636	req->type = REQ_READAHEAD;	1108	req->type = REQ_READAHEAD;
637	req->fh = newSVsv (fh);	1109	req->fh = newSVsv (fh);
638	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1110	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
639	req->offset = offset;	1111	req->offset = offset;
640	req->length = length;	1112	req->length = length;
641		1113
642	send_req (req);	1114	REQ_SEND;
643	}	1115	}
644		1116
645	void	1117	void
646	aio_stat(fh_or_path,callback=&PL_sv_undef)	1118	aio_stat (fh_or_path,callback=&PL_sv_undef)
647	SV * fh_or_path	1119	SV * fh_or_path
648	SV * callback	1120	SV * callback
649	ALIAS:	1121	ALIAS:
650	aio_stat = REQ_STAT	1122	aio_stat = REQ_STAT
651	aio_lstat = REQ_LSTAT	1123	aio_lstat = REQ_LSTAT
652	CODE:	1124	PPCODE:
653	{	1125	{
654	dREQ;	1126	dREQ;
655		1127
656	New (0, req->statdata, 1, Stat_t);	1128	New (0, req->statdata, 1, Stat_t);
657	if (!req->statdata)	1129	if (!req->statdata)
		1130	{
		1131	req_free (req);
658	croak ("out of memory during aio_req->statdata allocation (sorry, i just leaked memory, too)");	1132	croak ("out of memory during aio_req->statdata allocation");
		1133	}
659		1134
660	if (SvPOK (fh_or_path))	1135	if (SvPOK (fh_or_path))
661	{	1136	{
662	req->type = ix;	1137	req->type = ix;
663	req->data = newSVsv (fh_or_path);	1138	req->data = newSVsv (fh_or_path);
…		…
668	req->type = REQ_FSTAT;	1143	req->type = REQ_FSTAT;
669	req->fh = newSVsv (fh_or_path);	1144	req->fh = newSVsv (fh_or_path);
670	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1145	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
671	}	1146	}
672		1147
673	send_req (req);	1148	REQ_SEND;
674	}	1149	}
675		1150
676	void	1151	void
677	aio_unlink(pathname,callback=&PL_sv_undef)	1152	aio_unlink (pathname,callback=&PL_sv_undef)
678	SV * pathname	1153	SV * pathname
679	SV * callback	1154	SV * callback
680	ALIAS:	1155	ALIAS:
681	aio_unlink = REQ_UNLINK	1156	aio_unlink = REQ_UNLINK
682	aio_rmdir = REQ_RMDIR	1157	aio_rmdir = REQ_RMDIR
		1158	aio_readdir = REQ_READDIR
683	CODE:	1159	PPCODE:
684	{	1160	{
685	dREQ;	1161	dREQ;
686		1162
687	req->type = ix;	1163	req->type = ix;
688	req->data = newSVsv (pathname);	1164	req->data = newSVsv (pathname);
689	req->dataptr = SvPVbyte_nolen (req->data);	1165	req->dataptr = SvPVbyte_nolen (req->data);
690		1166
691	send_req (req);	1167	REQ_SEND;
692	}	1168	}
693		1169
694	void	1170	void
695	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1171	aio_link (oldpath,newpath,callback=&PL_sv_undef)
696	SV * oldpath	1172	SV * oldpath
697	SV * newpath	1173	SV * newpath
698	SV * callback	1174	SV * callback
		1175	ALIAS:
		1176	aio_link = REQ_LINK
		1177	aio_symlink = REQ_SYMLINK
		1178	aio_rename = REQ_RENAME
699	CODE:	1179	PPCODE:
700	{	1180	{
701	dREQ;	1181	dREQ;
702		1182
703	req->type = REQ_SYMLINK;	1183	req->type = ix;
704	req->fh = newSVsv (oldpath);	1184	req->fh = newSVsv (oldpath);
705	req->data2ptr = SvPVbyte_nolen (req->fh);	1185	req->data2ptr = SvPVbyte_nolen (req->fh);
706	req->data = newSVsv (newpath);	1186	req->data = newSVsv (newpath);
707	req->dataptr = SvPVbyte_nolen (req->data);	1187	req->dataptr = SvPVbyte_nolen (req->data);
708		1188
709	send_req (req);	1189	REQ_SEND;
710	}	1190	}
711		1191
712	void	1192	void
		1193	aio_sleep (delay,callback=&PL_sv_undef)
		1194	double delay
		1195	SV * callback
		1196	PPCODE:
		1197	{
		1198	dREQ;
		1199
		1200	req->type = REQ_SLEEP;
		1201	req->fd = delay < 0. ? 0 : delay;
		1202	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1203
		1204	REQ_SEND;
		1205	}
		1206
		1207	void
		1208	aio_group (callback=&PL_sv_undef)
		1209	SV * callback
		1210	PROTOTYPE: ;$
		1211	PPCODE:
		1212	{
		1213	dREQ;
		1214	req->type = REQ_GROUP;
		1215	req_send (req);
		1216	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1217	}
		1218
		1219	void
		1220	aio_nop (callback=&PL_sv_undef)
		1221	SV * callback
		1222	PPCODE:
		1223	{
		1224	dREQ;
		1225
		1226	req->type = REQ_NOP;
		1227
		1228	REQ_SEND;
		1229	}
		1230
		1231	void
713	flush()	1232	flush ()
714	PROTOTYPE:	1233	PROTOTYPE:
715	CODE:	1234	CODE:
716	while (nreqs)	1235	while (nreqs)
717	{	1236	{
718	poll_wait ();	1237	poll_wait ();
…		…
758	CODE:	1277	CODE:
759	RETVAL = nreqs;	1278	RETVAL = nreqs;
760	OUTPUT:	1279	OUTPUT:
761	RETVAL	1280	RETVAL
762		1281
		1282	PROTOTYPES: DISABLE
		1283
		1284	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1285
		1286	void
		1287	cancel (aio_req_ornot req)
		1288	PROTOTYPE:
		1289	CODE:
		1290	req_cancel (req);
		1291
		1292	void
		1293	cb (aio_req req, SV *callback=&PL_sv_undef)
		1294	CODE:
		1295	SvREFCNT_dec (req->callback);
		1296	req->callback = newSVsv (callback);
		1297
		1298	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1299
		1300	void
		1301	add (aio_req grp, ...)
		1302	PPCODE:
		1303	{
		1304	int i;
		1305	aio_req req;
		1306
		1307	if (grp->fd == 2)
		1308	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1309
		1310	for (i = 1; i < items; ++i )
		1311	{
		1312	if (GIMME_V != G_VOID)
		1313	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1314
		1315	req = SvAIO_REQ (ST (i));
		1316
		1317	if (req)
		1318	{
		1319	++grp->length;
		1320	req->grp = grp;
		1321
		1322	req->grp_prev = 0;
		1323	req->grp_next = grp->grp_first;
		1324
		1325	if (grp->grp_first)
		1326	grp->grp_first->grp_prev = req;
		1327
		1328	grp->grp_first = req;
		1329	}
		1330	}
		1331	}
		1332
		1333	void
		1334	result (aio_req grp, ...)
		1335	CODE:
		1336	{
		1337	int i;
		1338	AV *av = newAV ();
		1339
		1340	for (i = 1; i < items; ++i )
		1341	av_push (av, newSVsv (ST (i)));
		1342
		1343	SvREFCNT_dec (grp->data);
		1344	grp->data = (SV *)av;
		1345	}
		1346
		1347	void
		1348	feed_limit (aio_req grp, int limit)
		1349	CODE:
		1350	grp->fd2 = limit;
		1351	aio_grp_feed (grp);
		1352
		1353	void
		1354	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1355	CODE:
		1356	{
		1357	SvREFCNT_dec (grp->fh2);
		1358	grp->fh2 = newSVsv (callback);
		1359
		1360	if (grp->fd2 <= 0)
		1361	grp->fd2 = 2;
		1362
		1363	aio_grp_feed (grp);
		1364	}
		1365

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