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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.6 by root, Mon Jul 11 01:03:17 2005 UTC vs.
Revision 1.58 by root, Mon Oct 23 18:48:08 2006 UTC

		1	#define _REENTRANT 1
		2	#include <errno.h>
		3
1	#include "EXTERN.h"	4	#include "EXTERN.h"
2	#include "perl.h"	5	#include "perl.h"
3	#include "XSUB.h"	6	#include "XSUB.h"
4		7
		8	#include "autoconf/config.h"
		9
		10	#include <pthread.h>
		11
		12	#include <stddef.h>
		13	#include <errno.h>
		14	#include <sys/time.h>
		15	#include <sys/select.h>
5	#include <sys/types.h>	16	#include <sys/types.h>
6	#include <sys/stat.h>	17	#include <sys/stat.h>
		18	#include <limits.h>
7	#include <unistd.h>	19	#include <unistd.h>
8	#include <fcntl.h>	20	#include <fcntl.h>
9	#include <signal.h>	21	#include <signal.h>
10	#include <sched.h>	22	#include <sched.h>
11	#include <endian.h>
12		23
13	#include <pthread.h>	24	#if HAVE_SENDFILE
		25	# if __linux
		26	# include <sys/sendfile.h>
		27	# elif __freebsd
14	#include <sys/syscall.h>	28	# include <sys/socket.h>
		29	# include <sys/uio.h>
		30	# elif __hpux
		31	# include <sys/socket.h>
		32	# elif __solaris /* not yet */
		33	# include <sys/sendfile.h>
		34	# else
		35	# error sendfile support requested but not available
		36	# endif
		37	#endif
15		38
16	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	39	/* used for struct dirent, AIX doesn't provide it */
17	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	40	#ifndef NAME_MAX
18	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	41	# define NAME_MAX 4096
		42	#endif
19		43
20	#if __ia64	44	#if __ia64
21	# define STACKSIZE 65536	45	# define STACKSIZE 65536
22	#else	46	#else
23	# define STACKSIZE 4096	47	# define STACKSIZE 8192
24	#endif	48	#endif
25		49
26	enum {	50	enum {
27	REQ_QUIT,	51	REQ_QUIT,
28	REQ_OPEN, REQ_CLOSE,	52	REQ_OPEN, REQ_CLOSE,
29	REQ_READ, REQ_WRITE, REQ_READAHEAD,	53	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		54	REQ_SENDFILE,
30	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
31	REQ_FSYNC, REQ_FDATASYNC,	56	REQ_FSYNC, REQ_FDATASYNC,
		57	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
		58	REQ_READDIR,
		59	REQ_LINK, REQ_SYMLINK,
		60	REQ_GROUP, REQ_NOP,
		61	REQ_SLEEP,
32	};	62	};
33		63
		64	#define AIO_REQ_KLASS "IO::AIO::REQ"
		65	#define AIO_GRP_KLASS "IO::AIO::GRP"
		66
34	typedef struct aio_cb {	67	typedef struct aio_cb
		68	{
35	struct aio_cb *volatile next;	69	struct aio_cb *volatile next;
36		70
37	int type;	71	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
38		72
39	int fd;	73	SV *self; /* the perl counterpart of this request, if any */
		74
		75	SV *data, *callback;
		76	SV *fh, *fh2;
		77	void *dataptr, *data2ptr;
		78	Stat_t *statdata;
40	off_t offset;	79	off_t offset;
41	size_t length;	80	size_t length;
42	ssize_t result;	81	ssize_t result;
		82
		83	int type;
		84	int fd, fd2;
		85	int errorno;
		86	STRLEN dataoffset;
43	mode_t mode; /* open */	87	mode_t mode; /* open */
44	int errorno;	88	unsigned char pri;
45	SV *data, *callback;	89	unsigned char flags;
46	void *dataptr;
47	STRLEN dataoffset;
48
49	Stat_t *statdata;
50	} aio_cb;	90	} aio_cb;
51		91
		92	enum {
		93	FLAG_CANCELLED = 0x01,
		94	};
		95
52	typedef aio_cb *aio_req;	96	typedef aio_cb *aio_req;
		97	typedef aio_cb *aio_req_ornot;
53		98
54	static int started;	99	static int started, wanted;
55	static int nreqs;	100	static volatile int nreqs;
56	static int max_outstanding = 1<<30;	101	static int max_outstanding = 1<<30;
57	static int respipe [2];	102	static int respipe [2];
58		103
59	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	104	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
60	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	105	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
61	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	106	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
62		107
63	static volatile aio_req reqs, reqe; /* queue start, queue end */	108	static volatile aio_req reqs, reqe; /* queue start, queue end */
64	static volatile aio_req ress, rese; /* queue start, queue end */	109	static volatile aio_req ress, rese; /* queue start, queue end */
65		110
66	static void	111	static void req_invoke (aio_req req);
67	poll_wait ()	112	static void req_free (aio_req req);
		113
		114	/* must be called at most once */
		115	static SV *req_sv (aio_req req, const char *klass)
68	{	116	{
69	if (!nreqs)	117	if (!req->self)
		118	{
		119	req->self = (SV *)newHV ();
		120	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		121	}
		122
		123	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		124	}
		125
		126	static aio_req SvAIO_REQ (SV *sv)
		127	{
		128	MAGIC *mg;
		129
		130	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		131	croak ("object of class " AIO_REQ_KLASS " expected");
		132
		133	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		134
		135	return mg ? (aio_req)mg->mg_ptr : 0;
		136	}
		137
		138	static void aio_grp_feed (aio_req grp)
		139	{
		140	while (grp->length < grp->fd2 && !(grp->flags & FLAG_CANCELLED))
		141	{
		142	int old_len = grp->length;
		143
		144	if (grp->fh2 && SvOK (grp->fh2))
		145	{
		146	dSP;
		147
		148	ENTER;
		149	SAVETMPS;
		150	PUSHMARK (SP);
		151	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		152	PUTBACK;
		153	call_sv (grp->fh2, G_VOID | G_EVAL);
		154	SPAGAIN;
		155	FREETMPS;
		156	LEAVE;
		157	}
		158
		159	/* stop if no progress has been made */
		160	if (old_len == grp->length)
		161	{
		162	SvREFCNT_dec (grp->fh2);
		163	grp->fh2 = 0;
		164	break;
		165	}
		166	}
		167	}
		168
		169	static void aio_grp_dec (aio_req grp)
		170	{
		171	--grp->length;
		172
		173	/* call feeder, if applicable */
		174	aio_grp_feed (grp);
		175
		176	/* finish, if done */
		177	if (!grp->length && grp->fd)
		178	{
		179	req_invoke (grp);
		180	req_free (grp);
		181	}
		182	}
		183
		184	static void poll_wait ()
		185	{
		186	if (nreqs && !ress)
		187	{
		188	fd_set rfd;
		189	FD_ZERO(&rfd);
		190	FD_SET(respipe [0], &rfd);
		191
		192	select (respipe [0] + 1, &rfd, 0, 0, 0);
		193	}
		194	}
		195
		196	static void req_invoke (aio_req req)
		197	{
		198	dSP;
		199	int errorno = errno;
		200
		201	if (req->flags & FLAG_CANCELLED || !SvOK (req->callback))
70	return;	202	return;
71		203
72	fd_set rfd;	204	errno = req->errorno;
73	FD_ZERO(&rfd);
74	FD_SET(respipe [0], &rfd);
75		205
76	select (respipe [0] + 1, &rfd, 0, 0, 0);	206	ENTER;
77	}	207	SAVETMPS;
		208	PUSHMARK (SP);
		209	EXTEND (SP, 1);
78		210
79	static int	211	switch (req->type)
80	poll_cb ()	212	{
		213	case REQ_READDIR:
		214	{
		215	SV *rv = &PL_sv_undef;
		216
		217	if (req->result >= 0)
		218	{
		219	char *buf = req->data2ptr;
		220	AV *av = newAV ();
		221
		222	while (req->result)
		223	{
		224	SV *sv = newSVpv (buf, 0);
		225
		226	av_push (av, sv);
		227	buf += SvCUR (sv) + 1;
		228	req->result--;
		229	}
		230
		231	rv = sv_2mortal (newRV_noinc ((SV *)av));
		232	}
		233
		234	PUSHs (rv);
		235	}
		236	break;
		237
		238	case REQ_OPEN:
		239	{
		240	/* convert fd to fh */
		241	SV *fh;
		242
		243	PUSHs (sv_2mortal (newSViv (req->result)));
		244	PUTBACK;
		245	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		246	SPAGAIN;
		247
		248	fh = SvREFCNT_inc (POPs);
		249
		250	PUSHMARK (SP);
		251	XPUSHs (sv_2mortal (fh));
		252	}
		253	break;
		254
		255	case REQ_GROUP:
		256	req->fd = 2; /* mark group as finished */
		257
		258	if (req->data)
		259	{
		260	int i;
		261	AV *av = (AV *)req->data;
		262
		263	EXTEND (SP, AvFILL (av) + 1);
		264	for (i = 0; i <= AvFILL (av); ++i)
		265	PUSHs (*av_fetch (av, i, 0));
		266	}
		267	break;
		268
		269	case REQ_NOP:
		270	case REQ_SLEEP:
		271	break;
		272
		273	default:
		274	PUSHs (sv_2mortal (newSViv (req->result)));
		275	break;
		276	}
		277
		278
		279	PUTBACK;
		280	call_sv (req->callback, G_VOID | G_EVAL);
		281	SPAGAIN;
		282
		283	FREETMPS;
		284	LEAVE;
		285
		286	errno = errorno;
		287
		288	if (SvTRUE (ERRSV))
		289	{
		290	req_free (req);
		291	croak (0);
		292	}
		293	}
		294
		295	static void req_free (aio_req req)
		296	{
		297	if (req->grp)
		298	{
		299	aio_req grp = req->grp;
		300
		301	/* unlink request */
		302	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		303	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		304
		305	if (grp->grp_first == req)
		306	grp->grp_first = req->grp_next;
		307
		308	aio_grp_dec (grp);
		309	}
		310
		311	if (req->self)
		312	{
		313	sv_unmagic (req->self, PERL_MAGIC_ext);
		314	SvREFCNT_dec (req->self);
		315	}
		316
		317	SvREFCNT_dec (req->data);
		318	SvREFCNT_dec (req->fh);
		319	SvREFCNT_dec (req->fh2);
		320	SvREFCNT_dec (req->callback);
		321	Safefree (req->statdata);
		322
		323	if (req->type == REQ_READDIR && req->result >= 0)
		324	free (req->data2ptr);
		325
		326	Safefree (req);
		327	}
		328
		329	static void req_cancel (aio_req req)
		330	{
		331	req->flags |= FLAG_CANCELLED;
		332
		333	if (req->type == REQ_GROUP)
		334	{
		335	aio_req sub;
		336
		337	for (sub = req->grp_first; sub; sub = sub->grp_next)
		338	req_cancel (sub);
		339	}
		340	}
		341
		342	static int poll_cb ()
81	{	343	{
82	dSP;	344	dSP;
83	int count = 0;	345	int count = 0;
		346	int do_croak = 0;
84	aio_req req;	347	aio_req req;
85
86	{
87	/* read and signals sent by the worker threads */
88	char buf [32];
89	while (read (respipe [0], buf, 32) > 0)
90	;
91	}
92		348
93	for (;;)	349	for (;;)
94	{	350	{
95	pthread_mutex_lock (&reslock);	351	pthread_mutex_lock (&reslock);
96
97	req = ress;	352	req = ress;
98		353
99	if (ress)	354	if (req)
100	{	355	{
101	ress = ress->next;	356	ress = req->next;
		357
102	if (!ress) rese = 0;	358	if (!ress)
		359	{
		360	/* read any signals sent by the worker threads */
		361	char buf [32];
		362	while (read (respipe [0], buf, 32) == 32)
		363	;
		364
		365	rese = 0;
		366	}
103	}	367	}
104		368
105	pthread_mutex_unlock (&reslock);	369	pthread_mutex_unlock (&reslock);
106		370
107	if (!req)	371	if (!req)
108	break;	372	break;
109		373
110	nreqs--;	374	--nreqs;
111		375
112	if (req->type == REQ_QUIT)	376	if (req->type == REQ_QUIT)
113	started--;	377	started--;
		378	else if (req->type == REQ_GROUP && req->length)
		379	{
		380	req->fd = 1; /* mark request as delayed */
		381	continue;
		382	}
114	else	383	else
115	{	384	{
116	int errorno = errno;
117	errno = req->errorno;
118
119	if (req->type == REQ_READ)	385	if (req->type == REQ_READ)
120	SvCUR_set (req->data, req->dataoffset	386	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
121	+ req->result > 0 ? req->result : 0);
122		387
		388	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		389	SvREADONLY_off (req->data);
		390
123	if (req->data)	391	if (req->statdata)
124	SvREFCNT_dec (req->data);
125
126	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
127	{	392	{
128	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	393	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
129	PL_laststatval = req->result;	394	PL_laststatval = req->result;
130	PL_statcache = *(req->statdata);	395	PL_statcache = *(req->statdata);
131
132	Safefree (req->statdata);
133	}	396	}
134		397
135	PUSHMARK (SP);	398	req_invoke (req);
136	XPUSHs (sv_2mortal (newSViv (req->result)));
137		399
138	if (req->type == REQ_OPEN)
139	{
140	/* convert fd to fh */
141	SV *fh;
142
143	PUTBACK;
144	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
145	SPAGAIN;
146
147	fh = POPs;
148
149	PUSHMARK (SP);
150	XPUSHs (fh);
151	}
152
153	PUTBACK;
154	call_sv (req->callback, G_VOID | G_EVAL);
155	SPAGAIN;
156
157	if (req->callback)
158	SvREFCNT_dec (req->callback);
159
160	errno = errorno;
161	count++;	400	count++;
162	}	401	}
163		402
164	Safefree (req);	403	req_free (req);
165	}	404	}
166		405
167	return count;	406	return count;
168	}	407	}
169		408
170	static void *aio_proc(void *arg);	409	static void *aio_proc(void *arg);
171		410
172	static void
173	start_thread (void)	411	static void start_thread (void)
174	{	412	{
175	sigset_t fullsigset, oldsigset;	413	sigset_t fullsigset, oldsigset;
176	pthread_t tid;	414	pthread_t tid;
177	pthread_attr_t attr;	415	pthread_attr_t attr;
178		416
…		…
187	started++;	425	started++;
188		426
189	sigprocmask (SIG_SETMASK, &oldsigset, 0);	427	sigprocmask (SIG_SETMASK, &oldsigset, 0);
190	}	428	}
191		429
192	static void	430	static void req_send (aio_req req)
193	send_req (aio_req req)
194	{	431	{
		432	while (started < wanted && nreqs >= started)
		433	start_thread ();
		434
195	nreqs++;	435	++nreqs;
196		436
197	pthread_mutex_lock (&reqlock);	437	pthread_mutex_lock (&reqlock);
198		438
199	req->next = 0;	439	req->next = 0;
200		440
…		…
207	reqe = reqs = req;	447	reqe = reqs = req;
208		448
209	pthread_cond_signal (&reqwait);	449	pthread_cond_signal (&reqwait);
210	pthread_mutex_unlock (&reqlock);	450	pthread_mutex_unlock (&reqlock);
211		451
212	while (nreqs > max_outstanding)	452	if (nreqs > max_outstanding)
		453	for (;;)
		454	{
		455	poll_cb ();
		456
		457	if (nreqs <= max_outstanding)
		458	break;
		459
		460	poll_wait ();
		461	}
		462	}
		463
		464	static void end_thread (void)
		465	{
		466	aio_req req;
		467	Newz (0, req, 1, aio_cb);
		468	req->type = REQ_QUIT;
		469
		470	req_send (req);
		471	}
		472
		473	static void min_parallel (int nthreads)
		474	{
		475	if (wanted < nthreads)
		476	wanted = nthreads;
		477	}
		478
		479	static void max_parallel (int nthreads)
		480	{
		481	int cur = started;
		482
		483	if (wanted > nthreads)
		484	wanted = nthreads;
		485
		486	while (cur > wanted)
		487	{
		488	end_thread ();
		489	cur--;
		490	}
		491
		492	while (started > wanted)
213	{	493	{
214	poll_wait ();	494	poll_wait ();
215	poll_cb ();	495	poll_cb ();
216	}	496	}
217	}	497	}
218		498
219	static void	499	static void create_pipe ()
220	end_thread (void)
221	{	500	{
222	aio_req req;	501	if (pipe (respipe))
223	New (0, req, 1, aio_cb);	502	croak ("unable to initialize result pipe");
224	req->type = REQ_QUIT;
225		503
226	send_req (req);	504	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
227	}	505	croak ("cannot set result pipe to nonblocking mode");
228		506
229	static void	507	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
230	read_write (int dowrite, int fd, off_t offset, size_t length,	508	croak ("cannot set result pipe to nonblocking mode");
231	SV *data, STRLEN dataoffset, SV *callback)	509	}
232	{
233	aio_req req;
234	STRLEN svlen;
235	char *svptr = SvPV (data, svlen);
236		510
237	SvUPGRADE (data, SVt_PV);	511	/*****************************************************************************/
238	SvPOK_on (data);	512	/* work around various missing functions */
239		513
240	if (dataoffset < 0)	514	#if !HAVE_PREADWRITE
		515	# define pread aio_pread
		516	# define pwrite aio_pwrite
		517
		518	/*
		519	* make our pread/pwrite safe against themselves, but not against
		520	* normal read/write by using a mutex. slows down execution a lot,
		521	* but that's your problem, not mine.
		522	*/
		523	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
		524
		525	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		526	{
		527	ssize_t res;
		528	off_t ooffset;
		529
		530	pthread_mutex_lock (&preadwritelock);
		531	ooffset = lseek (fd, 0, SEEK_CUR);
		532	lseek (fd, offset, SEEK_SET);
		533	res = read (fd, buf, count);
		534	lseek (fd, ooffset, SEEK_SET);
		535	pthread_mutex_unlock (&preadwritelock);
		536
		537	return res;
		538	}
		539
		540	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		541	{
		542	ssize_t res;
		543	off_t ooffset;
		544
		545	pthread_mutex_lock (&preadwritelock);
		546	ooffset = lseek (fd, 0, SEEK_CUR);
		547	lseek (fd, offset, SEEK_SET);
		548	res = write (fd, buf, count);
		549	lseek (fd, offset, SEEK_SET);
		550	pthread_mutex_unlock (&preadwritelock);
		551
		552	return res;
		553	}
		554	#endif
		555
		556	#if !HAVE_FDATASYNC
		557	# define fdatasync fsync
		558	#endif
		559
		560	#if !HAVE_READAHEAD
		561	# define readahead aio_readahead
		562
		563	static ssize_t readahead (int fd, off_t offset, size_t count)
		564	{
		565	char readahead_buf[4096];
		566
		567	while (count > 0)
		568	{
		569	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
		570
		571	pread (fd, readahead_buf, len, offset);
241	dataoffset += svlen;	572	offset += len;
242		573	count -= len;
243	if (dataoffset < 0 || dataoffset > svlen)
244	croak ("data offset outside of string");
245
246	if (dowrite)
247	{	574	}
248	/* write: check length and adjust. */	575
249	if (length < 0 || length + dataoffset > svlen)	576	errno = 0;
250	length = svlen - dataoffset;	577	}
		578	#endif
		579
		580	#if !HAVE_READDIR_R
		581	# define readdir_r aio_readdir_r
		582
		583	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		584
		585	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		586	{
		587	struct dirent *e;
		588	int errorno;
		589
		590	pthread_mutex_lock (&readdirlock);
		591
		592	e = readdir (dirp);
		593	errorno = errno;
		594
		595	if (e)
		596	{
		597	*res = ent;
		598	strcpy (ent->d_name, e->d_name);
251	}	599	}
252	else	600	else
		601	*res = 0;
		602
		603	pthread_mutex_unlock (&readdirlock);
		604
		605	errno = errorno;
		606	return e ? 0 : -1;
		607	}
		608	#endif
		609
		610	/* sendfile always needs emulation */
		611	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
		612	{
		613	ssize_t res;
		614
		615	if (!count)
		616	return 0;
		617
		618	#if HAVE_SENDFILE
		619	# if __linux
		620	res = sendfile (ofd, ifd, &offset, count);
		621
		622	# elif __freebsd
		623	/*
		624	* Of course, the freebsd sendfile is a dire hack with no thoughts
		625	* wasted on making it similar to other I/O functions.
		626	*/
253	{	627	{
254	/* read: grow scalar as necessary */	628	off_t sbytes;
255	svptr = SvGROW (data, length + dataoffset);	629	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		630
		631	if (res < 0 && sbytes)
		632	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
		633	res = sbytes;
		634	}
		635
		636	# elif __hpux
		637	res = sendfile (ofd, ifd, offset, count, 0, 0);
		638
		639	# elif __solaris
		640	{
		641	struct sendfilevec vec;
		642	size_t sbytes;
		643
		644	vec.sfv_fd = ifd;
		645	vec.sfv_flag = 0;
		646	vec.sfv_off = offset;
		647	vec.sfv_len = count;
		648
		649	res = sendfilev (ofd, &vec, 1, &sbytes);
		650
		651	if (res < 0 && sbytes)
		652	res = sbytes;
		653	}
		654
		655	# endif
		656	#else
		657	res = -1;
		658	errno = ENOSYS;
		659	#endif
		660
		661	if (res < 0
		662	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		663	#if __solaris
		664	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		665	#endif
		666	)
		667	)
256	}	668	{
		669	/* emulate sendfile. this is a major pain in the ass */
		670	char buf[4096];
		671	res = 0;
257		672
258	if (length < 0)	673	while (count)
259	croak ("length must not be negative");	674	{
		675	ssize_t cnt;
		676
		677	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
260		678
261	Newz (0, req, 1, aio_cb);	679	if (cnt <= 0)
		680	{
		681	if (cnt && !res) res = -1;
		682	break;
		683	}
262		684
		685	cnt = write (ofd, buf, cnt);
		686
		687	if (cnt <= 0)
		688	{
		689	if (cnt && !res) res = -1;
		690	break;
		691	}
		692
		693	offset += cnt;
		694	res += cnt;
		695	count -= cnt;
		696	}
		697	}
		698
		699	return res;
		700	}
		701
		702	/* read a full directory */
		703	static int scandir_ (const char *path, void **namesp)
		704	{
		705	DIR *dirp = opendir (path);
		706	union
		707	{
		708	struct dirent d;
		709	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		710	} u;
		711	struct dirent *entp;
		712	char *name, *names;
		713	int memlen = 4096;
		714	int memofs = 0;
		715	int res = 0;
		716	int errorno;
		717
263	if (!req)	718	if (!dirp)
264	croak ("out of memory during aio_req allocation");	719	return -1;
265		720
266	req->type = dowrite ? REQ_WRITE : REQ_READ;	721	names = malloc (memlen);
267	req->fd = fd;
268	req->offset = offset;
269	req->length = length;
270	req->data = SvREFCNT_inc (data);
271	req->dataptr = (char *)svptr + dataoffset;
272	req->callback = SvREFCNT_inc (callback);
273		722
274	send_req (req);	723	for (;;)
275	}	724	{
		725	errno = 0, readdir_r (dirp, &u.d, &entp);
276		726
277	static void *	727	if (!entp)
		728	break;
		729
		730	name = entp->d_name;
		731
		732	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		733	{
		734	int len = strlen (name) + 1;
		735
		736	res++;
		737
		738	while (memofs + len > memlen)
		739	{
		740	memlen *= 2;
		741	names = realloc (names, memlen);
		742	if (!names)
		743	break;
		744	}
		745
		746	memcpy (names + memofs, name, len);
		747	memofs += len;
		748	}
		749	}
		750
		751	errorno = errno;
		752	closedir (dirp);
		753
		754	if (errorno)
		755	{
		756	free (names);
		757	errno = errorno;
		758	res = -1;
		759	}
		760
		761	*namesp = (void *)names;
		762	return res;
		763	}
		764
		765	/*****************************************************************************/
		766
278	aio_proc (void *thr_arg)	767	static void *aio_proc (void *thr_arg)
279	{	768	{
280	aio_req req;	769	aio_req req;
281	int type;	770	int type;
282		771
283	do	772	do
…		…
302		791
303	pthread_mutex_unlock (&reqlock);	792	pthread_mutex_unlock (&reqlock);
304		793
305	errno = 0; /* strictly unnecessary */	794	errno = 0; /* strictly unnecessary */
306		795
307	type = req->type;	796	if (!(req->flags & FLAG_CANCELLED))
308		797	switch (type = req->type) /* remember type for QUIT check */
309	switch (type)
310	{	798	{
311	case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break;	799	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
312	case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break;	800	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
313	#if SYS_readahead	801
314	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	802	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
315	#else	803	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
316	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
317	#endif
318		804
319	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	805	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
320	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	806	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
321	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	807	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
322		808
323	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	809	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
324	case REQ_CLOSE: req->result = close (req->fd); break;	810	case REQ_CLOSE: req->result = close (req->fd); break;
325	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	811	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
326
327	case REQ_FSYNC: req->result = fsync (req->fd); break;	812	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		813	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		814	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
		815	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
		816
328	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	817	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
		818	case REQ_FSYNC: req->result = fsync (req->fd); break;
		819	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
329		820
		821	case REQ_SLEEP:
		822	{
		823	struct timeval tv;
		824
		825	tv.tv_sec = req->fd;
		826	tv.tv_usec = req->fd2;
		827
		828	req->result = select (0, 0, 0, 0, &tv);
		829	}
		830
		831	case REQ_GROUP:
		832	case REQ_NOP:
330	case REQ_QUIT:	833	case REQ_QUIT:
331	break;	834	break;
332		835
333	default:	836	default:
334	req->result = ENOSYS;	837	req->result = ENOSYS;
335	break;	838	break;
336	}	839	}
337		840
338	req->errorno = errno;	841	req->errorno = errno;
339		842
340	pthread_mutex_lock (&reslock);	843	pthread_mutex_lock (&reslock);
341		844
…		…
359	while (type != REQ_QUIT);	862	while (type != REQ_QUIT);
360		863
361	return 0;	864	return 0;
362	}	865	}
363		866
		867	/*****************************************************************************/
		868
		869	static void atfork_prepare (void)
		870	{
		871	pthread_mutex_lock (&reqlock);
		872	pthread_mutex_lock (&reslock);
		873	#if !HAVE_PREADWRITE
		874	pthread_mutex_lock (&preadwritelock);
		875	#endif
		876	#if !HAVE_READDIR_R
		877	pthread_mutex_lock (&readdirlock);
		878	#endif
		879	}
		880
		881	static void atfork_parent (void)
		882	{
		883	#if !HAVE_READDIR_R
		884	pthread_mutex_unlock (&readdirlock);
		885	#endif
		886	#if !HAVE_PREADWRITE
		887	pthread_mutex_unlock (&preadwritelock);
		888	#endif
		889	pthread_mutex_unlock (&reslock);
		890	pthread_mutex_unlock (&reqlock);
		891	}
		892
		893	static void atfork_child (void)
		894	{
		895	aio_req prv;
		896
		897	started = 0;
		898
		899	while (reqs)
		900	{
		901	prv = reqs;
		902	reqs = prv->next;
		903	req_free (prv);
		904	}
		905
		906	reqs = reqe = 0;
		907
		908	while (ress)
		909	{
		910	prv = ress;
		911	ress = prv->next;
		912	req_free (prv);
		913	}
		914
		915	ress = rese = 0;
		916
		917	close (respipe [0]);
		918	close (respipe [1]);
		919	create_pipe ();
		920
		921	atfork_parent ();
		922	}
		923
		924	#define dREQ \
		925	aio_req req; \
		926	\
		927	if (SvOK (callback) && !SvROK (callback)) \
		928	croak ("callback must be undef or of reference type"); \
		929	\
		930	Newz (0, req, 1, aio_cb); \
		931	if (!req) \
		932	croak ("out of memory during aio_req allocation"); \
		933	\
		934	req->callback = newSVsv (callback)
		935
		936	#define REQ_SEND \
		937	req_send (req); \
		938	\
		939	if (GIMME_V != G_VOID) \
		940	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		941
364	MODULE = IO::AIO PACKAGE = IO::AIO	942	MODULE = IO::AIO PACKAGE = IO::AIO
365		943
		944	PROTOTYPES: ENABLE
		945
366	BOOT:	946	BOOT:
367	{	947	{
368	if (pipe (respipe))	948	HV *stash = gv_stashpv ("IO::AIO", 1);
369	croak ("unable to initialize result pipe");	949	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		950	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		951	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
370		952
371	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	953	create_pipe ();
372	croak ("cannot set result pipe to nonblocking mode");	954	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
373
374	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
375	croak ("cannot set result pipe to nonblocking mode");
376	}	955	}
377		956
378	void	957	void
379	min_parallel(nthreads)	958	min_parallel (nthreads)
380	int nthreads	959	int nthreads
381	PROTOTYPE: $	960	PROTOTYPE: $
382	CODE:
383	while (nthreads > started)
384	start_thread ();
385		961
386	void	962	void
387	max_parallel(nthreads)	963	max_parallel (nthreads)
388	int nthreads	964	int nthreads
389	PROTOTYPE: $	965	PROTOTYPE: $
390	CODE:
391	{
392	int cur = started;
393	while (cur > nthreads)
394	{
395	end_thread ();
396	cur--;
397	}
398
399	while (started > nthreads)
400	{
401	poll_wait ();
402	poll_cb ();
403	}
404	}
405		966
406	int	967	int
407	max_outstanding(nreqs)	968	max_outstanding (nreqs)
408	int nreqs	969	int nreqs
409	PROTOTYPE: $	970	PROTOTYPE: $
410	CODE:	971	CODE:
411	RETVAL = max_outstanding;	972	RETVAL = max_outstanding;
412	max_outstanding = nreqs;	973	max_outstanding = nreqs;
413		974
414	void	975	void
415	aio_open(pathname,flags,mode,callback)	976	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
416	SV * pathname	977	SV * pathname
417	int flags	978	int flags
418	int mode	979	int mode
419	SV * callback	980	SV * callback
420	PROTOTYPE: $$$$	981	PROTOTYPE: $$$;$
421	CODE:	982	PPCODE:
422	{	983	{
423	aio_req req;	984	dREQ;
424
425	Newz (0, req, 1, aio_cb);
426
427	if (!req)
428	croak ("out of memory during aio_req allocation");
429		985
430	req->type = REQ_OPEN;	986	req->type = REQ_OPEN;
431	req->data = newSVsv (pathname);	987	req->data = newSVsv (pathname);
432	req->dataptr = SvPV_nolen (req->data);	988	req->dataptr = SvPVbyte_nolen (req->data);
433	req->fd = flags;	989	req->fd = flags;
434	req->mode = mode;	990	req->mode = mode;
435	req->callback = SvREFCNT_inc (callback);
436		991
437	send_req (req);	992	REQ_SEND;
438	}	993	}
439		994
440	void	995	void
441	aio_close(fh,callback)	996	aio_close (fh,callback=&PL_sv_undef)
442	InputStream fh	997	SV * fh
443	SV * callback	998	SV * callback
444	PROTOTYPE: $$	999	PROTOTYPE: $;$
445	ALIAS:	1000	ALIAS:
446	aio_close = REQ_CLOSE	1001	aio_close = REQ_CLOSE
447	aio_fsync = REQ_FSYNC	1002	aio_fsync = REQ_FSYNC
448	aio_fdatasync = REQ_FDATASYNC	1003	aio_fdatasync = REQ_FDATASYNC
449	CODE:	1004	PPCODE:
		1005	{
		1006	dREQ;
		1007
		1008	req->type = ix;
		1009	req->fh = newSVsv (fh);
		1010	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
		1011
		1012	REQ_SEND (req);
		1013	}
		1014
		1015	void
		1016	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
		1017	SV * fh
		1018	UV offset
		1019	UV length
		1020	SV * data
		1021	UV dataoffset
		1022	SV * callback
		1023	ALIAS:
		1024	aio_read = REQ_READ
		1025	aio_write = REQ_WRITE
		1026	PROTOTYPE: $$$$$;$
		1027	PPCODE:
450	{	1028	{
451	aio_req req;	1029	aio_req req;
		1030	STRLEN svlen;
		1031	char *svptr = SvPVbyte (data, svlen);
452		1032
453	Newz (0, req, 1, aio_cb);	1033	SvUPGRADE (data, SVt_PV);
		1034	SvPOK_on (data);
454		1035
455	if (!req)	1036	if (dataoffset < 0)
456	croak ("out of memory during aio_req allocation");	1037	dataoffset += svlen;
457		1038
458	req->type = ix;	1039	if (dataoffset < 0 || dataoffset > svlen)
459	req->fd = PerlIO_fileno (fh);	1040	croak ("data offset outside of string");
460	req->callback = SvREFCNT_inc (callback);
461		1041
462	send_req (req);	1042	if (ix == REQ_WRITE)
463	}	1043	{
464		1044	/* write: check length and adjust. */
465	void	1045	if (length < 0 || length + dataoffset > svlen)
466	aio_read(fh,offset,length,data,dataoffset,callback)	1046	length = svlen - dataoffset;
467	InputStream fh	1047	}
468	UV offset	1048	else
469	IV length	1049	{
470	SV * data	1050	/* read: grow scalar as necessary */
471	IV dataoffset	1051	svptr = SvGROW (data, length + dataoffset);
472	SV * callback	1052	}
473	PROTOTYPE: $$$$$$
474	CODE:
475	read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
476
477	void
478	aio_write(fh,offset,length,data,dataoffset,callback)
479	OutputStream fh
480	UV offset
481	IV length
482	SV * data
483	IV dataoffset
484	SV * callback
485	PROTOTYPE: $$$$$$
486	CODE:
487	read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
488
489	void
490	aio_readahead(fh,offset,length,callback)
491	InputStream fh
492	UV offset
493	IV length
494	SV * callback
495	PROTOTYPE: $$$$
496	CODE:
497	{
498	aio_req req;
499		1053
500	if (length < 0)	1054	if (length < 0)
501	croak ("length must not be negative");	1055	croak ("length must not be negative");
502		1056
503	Newz (0, req, 1, aio_cb);	1057	{
		1058	dREQ;
504		1059
505	if (!req)	1060	req->type = ix;
506	croak ("out of memory during aio_req allocation");	1061	req->fh = newSVsv (fh);
		1062	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
		1063	: IoOFP (sv_2io (fh)));
		1064	req->offset = offset;
		1065	req->length = length;
		1066	req->data = SvREFCNT_inc (data);
		1067	req->dataptr = (char *)svptr + dataoffset;
		1068
		1069	if (!SvREADONLY (data))
		1070	{
		1071	SvREADONLY_on (data);
		1072	req->data2ptr = (void *)data;
		1073	}
		1074
		1075	REQ_SEND;
		1076	}
		1077	}
		1078
		1079	void
		1080	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1081	SV * out_fh
		1082	SV * in_fh
		1083	UV in_offset
		1084	UV length
		1085	SV * callback
		1086	PROTOTYPE: $$$$;$
		1087	PPCODE:
		1088	{
		1089	dREQ;
		1090
		1091	req->type = REQ_SENDFILE;
		1092	req->fh = newSVsv (out_fh);
		1093	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1094	req->fh2 = newSVsv (in_fh);
		1095	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1096	req->offset = in_offset;
		1097	req->length = length;
		1098
		1099	REQ_SEND;
		1100	}
		1101
		1102	void
		1103	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
		1104	SV * fh
		1105	UV offset
		1106	IV length
		1107	SV * callback
		1108	PROTOTYPE: $$$;$
		1109	PPCODE:
		1110	{
		1111	dREQ;
507		1112
508	req->type = REQ_READAHEAD;	1113	req->type = REQ_READAHEAD;
		1114	req->fh = newSVsv (fh);
509	req->fd = PerlIO_fileno (fh);	1115	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
510	req->offset = offset;	1116	req->offset = offset;
511	req->length = length;	1117	req->length = length;
512	req->callback = SvREFCNT_inc (callback);
513		1118
514	send_req (req);	1119	REQ_SEND;
515	}	1120	}
516		1121
517	void	1122	void
518	aio_stat(fh_or_path,callback)	1123	aio_stat (fh_or_path,callback=&PL_sv_undef)
519	SV * fh_or_path	1124	SV * fh_or_path
520	SV * callback	1125	SV * callback
521	PROTOTYPE: $$
522	ALIAS:	1126	ALIAS:
		1127	aio_stat = REQ_STAT
523	aio_lstat = 1	1128	aio_lstat = REQ_LSTAT
524	CODE:	1129	PPCODE:
525	{	1130	{
526	aio_req req;	1131	dREQ;
527
528	Newz (0, req, 1, aio_cb);
529
530	if (!req)
531	croak ("out of memory during aio_req allocation");
532		1132
533	New (0, req->statdata, 1, Stat_t);	1133	New (0, req->statdata, 1, Stat_t);
534
535	if (!req->statdata)	1134	if (!req->statdata)
		1135	{
		1136	req_free (req);
536	croak ("out of memory during aio_req->statdata allocation");	1137	croak ("out of memory during aio_req->statdata allocation");
		1138	}
537		1139
538	if (SvPOK (fh_or_path))	1140	if (SvPOK (fh_or_path))
539	{	1141	{
540	req->type = ix ? REQ_LSTAT : REQ_STAT;	1142	req->type = ix;
541	req->data = newSVsv (fh_or_path);	1143	req->data = newSVsv (fh_or_path);
542	req->dataptr = SvPV_nolen (req->data);	1144	req->dataptr = SvPVbyte_nolen (req->data);
543	}	1145	}
544	else	1146	else
545	{	1147	{
546	req->type = REQ_FSTAT;	1148	req->type = REQ_FSTAT;
		1149	req->fh = newSVsv (fh_or_path);
547	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1150	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
548	}	1151	}
549		1152
550	req->callback = SvREFCNT_inc (callback);	1153	REQ_SEND;
551
552	send_req (req);
553	}	1154	}
554		1155
555	void	1156	void
556	aio_unlink(pathname,callback)	1157	aio_unlink (pathname,callback=&PL_sv_undef)
557	SV * pathname	1158	SV * pathname
558	SV * callback	1159	SV * callback
559	PROTOTYPE: $$	1160	ALIAS:
		1161	aio_unlink = REQ_UNLINK
		1162	aio_rmdir = REQ_RMDIR
		1163	aio_readdir = REQ_READDIR
560	CODE:	1164	PPCODE:
561	{	1165	{
562	aio_req req;	1166	dREQ;
563		1167
564	Newz (0, req, 1, aio_cb);	1168	req->type = ix;
		1169	req->data = newSVsv (pathname);
		1170	req->dataptr = SvPVbyte_nolen (req->data);
565		1171
566	if (!req)	1172	REQ_SEND;
567	croak ("out of memory during aio_req allocation");	1173	}
		1174
		1175	void
		1176	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1177	SV * oldpath
		1178	SV * newpath
		1179	SV * callback
		1180	ALIAS:
		1181	aio_link = REQ_LINK
		1182	aio_symlink = REQ_SYMLINK
		1183	aio_rename = REQ_RENAME
		1184	PPCODE:
		1185	{
		1186	dREQ;
568		1187
569	req->type = REQ_UNLINK;	1188	req->type = ix;
		1189	req->fh = newSVsv (oldpath);
		1190	req->data2ptr = SvPVbyte_nolen (req->fh);
570	req->data = newSVsv (pathname);	1191	req->data = newSVsv (newpath);
571	req->dataptr = SvPV_nolen (req->data);	1192	req->dataptr = SvPVbyte_nolen (req->data);
572	req->callback = SvREFCNT_inc (callback);
573		1193
574	send_req (req);	1194	REQ_SEND;
575	}	1195	}
576		1196
577	void	1197	void
		1198	aio_sleep (delay,callback=&PL_sv_undef)
		1199	double delay
		1200	SV * callback
		1201	PPCODE:
		1202	{
		1203	dREQ;
		1204
		1205	req->type = REQ_SLEEP;
		1206	req->fd = delay < 0. ? 0 : delay;
		1207	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1208
		1209	REQ_SEND;
		1210	}
		1211
		1212	void
		1213	aio_group (callback=&PL_sv_undef)
		1214	SV * callback
		1215	PROTOTYPE: ;$
		1216	PPCODE:
		1217	{
		1218	dREQ;
		1219	req->type = REQ_GROUP;
		1220	req_send (req);
		1221	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1222	}
		1223
		1224	void
		1225	aio_nop (callback=&PL_sv_undef)
		1226	SV * callback
		1227	PPCODE:
		1228	{
		1229	dREQ;
		1230
		1231	req->type = REQ_NOP;
		1232
		1233	REQ_SEND;
		1234	}
		1235
		1236	void
578	flush()	1237	flush ()
579	PROTOTYPE:	1238	PROTOTYPE:
580	CODE:	1239	CODE:
581	while (nreqs)	1240	while (nreqs)
582	{	1241	{
583	poll_wait ();	1242	poll_wait ();
584	poll_cb ();	1243	poll_cb ();
585	}	1244	}
586		1245
		1246	void
		1247	poll()
		1248	PROTOTYPE:
		1249	CODE:
		1250	if (nreqs)
		1251	{
		1252	poll_wait ();
		1253	poll_cb ();
		1254	}
		1255
587	int	1256	int
588	poll_fileno()	1257	poll_fileno()
589	PROTOTYPE:	1258	PROTOTYPE:
590	CODE:	1259	CODE:
591	RETVAL = respipe [0];	1260	RETVAL = respipe [0];
…		…
613	CODE:	1282	CODE:
614	RETVAL = nreqs;	1283	RETVAL = nreqs;
615	OUTPUT:	1284	OUTPUT:
616	RETVAL	1285	RETVAL
617		1286
		1287	PROTOTYPES: DISABLE
		1288
		1289	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1290
		1291	void
		1292	cancel (aio_req_ornot req)
		1293	PROTOTYPE:
		1294	CODE:
		1295	req_cancel (req);
		1296
		1297	void
		1298	cb (aio_req req, SV *callback=&PL_sv_undef)
		1299	CODE:
		1300	SvREFCNT_dec (req->callback);
		1301	req->callback = newSVsv (callback);
		1302
		1303	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1304
		1305	void
		1306	add (aio_req grp, ...)
		1307	PPCODE:
		1308	{
		1309	int i;
		1310	aio_req req;
		1311
		1312	if (grp->fd == 2)
		1313	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1314
		1315	for (i = 1; i < items; ++i )
		1316	{
		1317	if (GIMME_V != G_VOID)
		1318	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1319
		1320	req = SvAIO_REQ (ST (i));
		1321
		1322	if (req)
		1323	{
		1324	++grp->length;
		1325	req->grp = grp;
		1326
		1327	req->grp_prev = 0;
		1328	req->grp_next = grp->grp_first;
		1329
		1330	if (grp->grp_first)
		1331	grp->grp_first->grp_prev = req;
		1332
		1333	grp->grp_first = req;
		1334	}
		1335	}
		1336	}
		1337
		1338	void
		1339	result (aio_req grp, ...)
		1340	CODE:
		1341	{
		1342	int i;
		1343	AV *av = newAV ();
		1344
		1345	for (i = 1; i < items; ++i )
		1346	av_push (av, newSVsv (ST (i)));
		1347
		1348	SvREFCNT_dec (grp->data);
		1349	grp->data = (SV *)av;
		1350	}
		1351
		1352	void
		1353	feed_limit (aio_req grp, int limit)
		1354	CODE:
		1355	grp->fd2 = limit;
		1356	aio_grp_feed (grp);
		1357
		1358	void
		1359	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1360	CODE:
		1361	{
		1362	SvREFCNT_dec (grp->fh2);
		1363	grp->fh2 = newSVsv (callback);
		1364
		1365	if (grp->fd2 <= 0)
		1366	grp->fd2 = 2;
		1367
		1368	aio_grp_feed (grp);
		1369	}
		1370

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