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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.8 by root, Mon Jul 11 02:53:59 2005 UTC vs.
Revision 1.49 by root, Sun Oct 22 13:33:28 2006 UTC

		1	#define _REENTRANT 1
		2	#include <errno.h>
		3
1	#include "EXTERN.h"	4	#include "EXTERN.h"
2	#include "perl.h"	5	#include "perl.h"
3	#include "XSUB.h"	6	#include "XSUB.h"
4		7
		8	#include "autoconf/config.h"
		9
		10	#include <pthread.h>
		11
		12	#include <stddef.h>
		13	#include <errno.h>
		14	#include <sys/time.h>
		15	#include <sys/select.h>
5	#include <sys/types.h>	16	#include <sys/types.h>
6	#include <sys/stat.h>	17	#include <sys/stat.h>
		18	#include <limits.h>
7	#include <unistd.h>	19	#include <unistd.h>
8	#include <fcntl.h>	20	#include <fcntl.h>
9	#include <signal.h>	21	#include <signal.h>
10	#include <sched.h>	22	#include <sched.h>
11	#include <endian.h>
12		23
13	#include <pthread.h>	24	#if HAVE_SENDFILE
		25	# if __linux
		26	# include <sys/sendfile.h>
		27	# elif __freebsd
14	#include <sys/syscall.h>	28	# include <sys/socket.h>
		29	# include <sys/uio.h>
		30	# elif __hpux
		31	# include <sys/socket.h>
		32	# elif __solaris /* not yet */
		33	# include <sys/sendfile.h>
		34	# else
		35	# error sendfile support requested but not available
		36	# endif
		37	#endif
15		38
16	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	39	/* used for struct dirent, AIX doesn't provide it */
17	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	40	#ifndef NAME_MAX
18	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	41	# define NAME_MAX 4096
		42	#endif
19		43
20	#if __ia64	44	#if __ia64
21	# define STACKSIZE 65536	45	# define STACKSIZE 65536
22	#else	46	#else
23	# define STACKSIZE 4096	47	# define STACKSIZE 8192
24	#endif	48	#endif
25		49
26	enum {	50	enum {
27	REQ_QUIT,	51	REQ_QUIT,
28	REQ_OPEN, REQ_CLOSE,	52	REQ_OPEN, REQ_CLOSE,
29	REQ_READ, REQ_WRITE, REQ_READAHEAD,	53	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		54	REQ_SENDFILE,
30	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
31	REQ_FSYNC, REQ_FDATASYNC,	56	REQ_FSYNC, REQ_FDATASYNC,
		57	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
		58	REQ_READDIR,
		59	REQ_LINK, REQ_SYMLINK,
		60	REQ_SLEEP,
		61	REQ_GROUP,
32	};	62	};
33		63
		64	#define AIO_REQ_KLASS "IO::AIO::REQ"
		65	#define AIO_GRP_KLASS "IO::AIO::GRP"
		66
34	typedef struct aio_cb {	67	typedef struct aio_cb
		68	{
35	struct aio_cb *volatile next;	69	struct aio_cb *volatile next;
36		70
37	int type;	71	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
38		72
39	int fd;	73	SV *self; /* the perl counterpart of this request, if any */
		74
		75	SV *data, *callback;
		76	SV *fh, *fh2;
		77	void *dataptr, *data2ptr;
		78	Stat_t *statdata;
40	off_t offset;	79	off_t offset;
41	size_t length;	80	size_t length;
42	ssize_t result;	81	ssize_t result;
		82
		83	int type;
		84	int fd, fd2;
		85	int errorno;
		86	STRLEN dataoffset;
43	mode_t mode; /* open */	87	mode_t mode; /* open */
44	int errorno;	88	unsigned char cancelled;
45	SV *data, *callback;
46	void *dataptr;
47	STRLEN dataoffset;
48
49	Stat_t *statdata;
50	} aio_cb;	89	} aio_cb;
51		90
52	typedef aio_cb *aio_req;	91	typedef aio_cb *aio_req;
		92	typedef aio_cb *aio_req_ornot;
53		93
54	static int started;	94	static int started, wanted;
55	static int nreqs;	95	static volatile int nreqs;
56	static int max_outstanding = 1<<30;	96	static int max_outstanding = 1<<30;
57	static int respipe [2];	97	static int respipe [2];
58		98
59	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	99	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
60	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	100	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
61	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	101	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
62		102
63	static volatile aio_req reqs, reqe; /* queue start, queue end */	103	static volatile aio_req reqs, reqe; /* queue start, queue end */
64	static volatile aio_req ress, rese; /* queue start, queue end */	104	static volatile aio_req ress, rese; /* queue start, queue end */
65		105
66	static void	106	static void req_free (aio_req req);
67	poll_wait ()	107
		108	/* must be called at most once */
		109	static SV *req_sv (aio_req req, const char *klass)
68	{	110	{
69	if (!nreqs)	111	if (!req->self)
		112	{
		113	req->self = (SV *)newHV ();
		114	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		115	}
		116
		117	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		118	}
		119
		120	static aio_req SvAIO_REQ (SV *sv)
		121	{
		122	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		123	croak ("object of class " AIO_REQ_KLASS " expected");
		124
		125	MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		126
		127	return mg ? (aio_req)mg->mg_ptr : 0;
		128	}
		129
		130	static void aio_grp_feed (aio_req grp)
		131	{
		132	while (grp->length < grp->fd2)
		133	{
		134	int old_len = grp->length;
		135
		136	if (grp->fh2 && SvOK (grp->fh2))
		137	{
		138	dSP;
		139
		140	ENTER;
		141	SAVETMPS;
		142	PUSHMARK (SP);
		143	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		144	PUTBACK;
		145	call_sv (grp->fh2, G_VOID | G_EVAL);
		146	SPAGAIN;
		147	FREETMPS;
		148	LEAVE;
		149	}
		150
		151	/* stop if no progress has been made */
		152	if (old_len == grp->length)
		153	{
		154	SvREFCNT_dec (grp->fh2);
		155	grp->fh2 = 0;
		156	break;
		157	}
		158	}
		159	}
		160
		161	static void poll_wait ()
		162	{
		163	if (nreqs && !ress)
		164	{
		165	fd_set rfd;
		166	FD_ZERO(&rfd);
		167	FD_SET(respipe [0], &rfd);
		168
		169	select (respipe [0] + 1, &rfd, 0, 0, 0);
		170	}
		171	}
		172
		173	static void req_invoke (aio_req req)
		174	{
		175	dSP;
		176	int errorno = errno;
		177
		178	if (req->cancelled || !SvOK (req->callback))
70	return;	179	return;
71		180
72	fd_set rfd;	181	errno = req->errorno;
73	FD_ZERO(&rfd);
74	FD_SET(respipe [0], &rfd);
75		182
76	select (respipe [0] + 1, &rfd, 0, 0, 0);	183	ENTER;
77	}	184	SAVETMPS;
		185	PUSHMARK (SP);
		186	EXTEND (SP, 1);
78		187
79	static int	188	switch (req->type)
80	poll_cb ()	189	{
		190	case REQ_READDIR:
		191	{
		192	SV *rv = &PL_sv_undef;
		193
		194	if (req->result >= 0)
		195	{
		196	char *buf = req->data2ptr;
		197	AV *av = newAV ();
		198
		199	while (req->result)
		200	{
		201	SV *sv = newSVpv (buf, 0);
		202
		203	av_push (av, sv);
		204	buf += SvCUR (sv) + 1;
		205	req->result--;
		206	}
		207
		208	rv = sv_2mortal (newRV_noinc ((SV *)av));
		209	}
		210
		211	PUSHs (rv);
		212	}
		213	break;
		214
		215	case REQ_OPEN:
		216	{
		217	/* convert fd to fh */
		218	SV *fh;
		219
		220	PUSHs (sv_2mortal (newSViv (req->result)));
		221	PUTBACK;
		222	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		223	SPAGAIN;
		224
		225	fh = SvREFCNT_inc (POPs);
		226
		227	PUSHMARK (SP);
		228	XPUSHs (sv_2mortal (fh));
		229	}
		230	break;
		231
		232	case REQ_GROUP:
		233	req->fd = 2; /* mark group as finished */
		234
		235	if (req->data)
		236	{
		237	int i;
		238	AV *av = (AV *)req->data;
		239
		240	EXTEND (SP, AvFILL (av) + 1);
		241	for (i = 0; i <= AvFILL (av); ++i)
		242	PUSHs (*av_fetch (av, i, 0));
		243	}
		244	break;
		245
		246	case REQ_SLEEP:
		247	break;
		248
		249	default:
		250	PUSHs (sv_2mortal (newSViv (req->result)));
		251	break;
		252	}
		253
		254
		255	PUTBACK;
		256	call_sv (req->callback, G_VOID | G_EVAL);
		257	SPAGAIN;
		258
		259	if (SvTRUE (ERRSV))
		260	{
		261	req_free (req);
		262	croak (0);
		263	}
		264
		265	FREETMPS;
		266	LEAVE;
		267
		268	errno = errorno;
		269	}
		270
		271	static void req_free (aio_req req)
		272	{
		273	if (req->grp)
		274	{
		275	aio_req grp = req->grp;
		276
		277	/* unlink request */
		278	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		279	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		280
		281	if (grp->grp_first == req)
		282	grp->grp_first = req->grp_next;
		283
		284	--grp->length;
		285
		286	/* call feeder, if applicable */
		287	aio_grp_feed (grp);
		288
		289	/* finish, if done */
		290	if (!grp->length && grp->fd)
		291	{
		292	req_invoke (grp);
		293	req_free (grp);
		294	}
		295	}
		296
		297	if (req->self)
		298	{
		299	sv_unmagic (req->self, PERL_MAGIC_ext);
		300	SvREFCNT_dec (req->self);
		301	}
		302
		303	SvREFCNT_dec (req->data);
		304	SvREFCNT_dec (req->fh);
		305	SvREFCNT_dec (req->fh2);
		306	SvREFCNT_dec (req->callback);
		307	Safefree (req->statdata);
		308
		309	if (req->type == REQ_READDIR && req->result >= 0)
		310	free (req->data2ptr);
		311
		312	Safefree (req);
		313	}
		314
		315	static void req_cancel (aio_req req)
		316	{
		317	req->cancelled = 1;
		318
		319	if (req->type == REQ_GROUP)
		320	{
		321	aio_req sub;
		322
		323	for (sub = req->grp_first; sub; sub = sub->grp_next)
		324	req_cancel (sub);
		325	}
		326	}
		327
		328	static int poll_cb ()
81	{	329	{
82	dSP;	330	dSP;
83	int count = 0;	331	int count = 0;
		332	int do_croak = 0;
84	aio_req req;	333	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		334
93	for (;;)	335	for (;;)
94	{	336	{
95	pthread_mutex_lock (&reslock);	337	pthread_mutex_lock (&reslock);
96
97	req = ress;	338	req = ress;
98		339
99	if (ress)	340	if (req)
100	{	341	{
101	ress = ress->next;	342	ress = req->next;
		343
102	if (!ress) rese = 0;	344	if (!ress)
		345	{
		346	/* read any signals sent by the worker threads */
		347	char buf [32];
		348	while (read (respipe [0], buf, 32) == 32)
		349	;
		350
		351	rese = 0;
		352	}
103	}	353	}
104		354
105	pthread_mutex_unlock (&reslock);	355	pthread_mutex_unlock (&reslock);
106		356
107	if (!req)	357	if (!req)
…		…
109		359
110	nreqs--;	360	nreqs--;
111		361
112	if (req->type == REQ_QUIT)	362	if (req->type == REQ_QUIT)
113	started--;	363	started--;
		364	else if (req->type == REQ_GROUP && req->length)
		365	{
		366	req->fd = 1; /* mark request as delayed */
		367	continue;
		368	}
114	else	369	else
115	{	370	{
116	int errorno = errno;
117	errno = req->errorno;
118
119	if (req->type == REQ_READ)	371	if (req->type == REQ_READ)
120	SvCUR_set (req->data, req->dataoffset	372	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
121	+ req->result > 0 ? req->result : 0);
122		373
		374	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		375	SvREADONLY_off (req->data);
		376
123	if (req->data)	377	if (req->statdata)
124	SvREFCNT_dec (req->data);
125
126	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
127	{	378	{
128	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	379	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
129	PL_laststatval = req->result;	380	PL_laststatval = req->result;
130	PL_statcache = *(req->statdata);	381	PL_statcache = *(req->statdata);
131
132	Safefree (req->statdata);
133	}	382	}
134		383
135	PUSHMARK (SP);	384	req_invoke (req);
136	XPUSHs (sv_2mortal (newSViv (req->result)));
137		385
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	if (SvOK (req->callback))
154	{
155	PUTBACK;
156	call_sv (req->callback, G_VOID | G_EVAL);
157	SPAGAIN;
158	}
159
160	if (req->callback)
161	SvREFCNT_dec (req->callback);
162
163	errno = errorno;
164	count++;	386	count++;
165	}	387	}
166		388
167	Safefree (req);	389	req_free (req);
168	}	390	}
169		391
170	return count;	392	return count;
171	}	393	}
172		394
173	static void *aio_proc(void *arg);	395	static void *aio_proc(void *arg);
174		396
175	static void
176	start_thread (void)	397	static void start_thread (void)
177	{	398	{
178	sigset_t fullsigset, oldsigset;	399	sigset_t fullsigset, oldsigset;
179	pthread_t tid;	400	pthread_t tid;
180	pthread_attr_t attr;	401	pthread_attr_t attr;
181		402
…		…
190	started++;	411	started++;
191		412
192	sigprocmask (SIG_SETMASK, &oldsigset, 0);	413	sigprocmask (SIG_SETMASK, &oldsigset, 0);
193	}	414	}
194		415
195	static void	416	static void req_send (aio_req req)
196	send_req (aio_req req)
197	{	417	{
		418	while (started < wanted && nreqs >= started)
		419	start_thread ();
		420
198	nreqs++;	421	nreqs++;
199		422
200	pthread_mutex_lock (&reqlock);	423	pthread_mutex_lock (&reqlock);
201		424
202	req->next = 0;	425	req->next = 0;
…		…
210	reqe = reqs = req;	433	reqe = reqs = req;
211		434
212	pthread_cond_signal (&reqwait);	435	pthread_cond_signal (&reqwait);
213	pthread_mutex_unlock (&reqlock);	436	pthread_mutex_unlock (&reqlock);
214		437
215	while (nreqs > max_outstanding)	438	if (nreqs > max_outstanding)
		439	for (;;)
		440	{
		441	poll_cb ();
		442
		443	if (nreqs <= max_outstanding)
		444	break;
		445
		446	poll_wait ();
		447	}
		448	}
		449
		450	static void end_thread (void)
		451	{
		452	aio_req req;
		453	Newz (0, req, 1, aio_cb);
		454	req->type = REQ_QUIT;
		455
		456	req_send (req);
		457	}
		458
		459	static void min_parallel (int nthreads)
		460	{
		461	if (wanted < nthreads)
		462	wanted = nthreads;
		463	}
		464
		465	static void max_parallel (int nthreads)
		466	{
		467	int cur = started;
		468
		469	if (wanted > nthreads)
		470	wanted = nthreads;
		471
		472	while (cur > wanted)
		473	{
		474	end_thread ();
		475	cur--;
		476	}
		477
		478	while (started > wanted)
216	{	479	{
217	poll_wait ();	480	poll_wait ();
218	poll_cb ();	481	poll_cb ();
219	}	482	}
220	}	483	}
221		484
222	static void	485	static void create_pipe ()
223	end_thread (void)
224	{	486	{
225	aio_req req;	487	if (pipe (respipe))
226	New (0, req, 1, aio_cb);	488	croak ("unable to initialize result pipe");
227	req->type = REQ_QUIT;
228		489
229	send_req (req);	490	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
230	}	491	croak ("cannot set result pipe to nonblocking mode");
231		492
232	static void	493	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
233	read_write (int dowrite, int fd, off_t offset, size_t length,	494	croak ("cannot set result pipe to nonblocking mode");
234	SV *data, STRLEN dataoffset, SV *callback)	495	}
235	{
236	aio_req req;
237	STRLEN svlen;
238	char *svptr = SvPV (data, svlen);
239		496
240	SvUPGRADE (data, SVt_PV);	497	/*****************************************************************************/
241	SvPOK_on (data);	498	/* work around various missing functions */
242		499
243	if (dataoffset < 0)	500	#if !HAVE_PREADWRITE
		501	# define pread aio_pread
		502	# define pwrite aio_pwrite
		503
		504	/*
		505	* make our pread/pwrite safe against themselves, but not against
		506	* normal read/write by using a mutex. slows down execution a lot,
		507	* but that's your problem, not mine.
		508	*/
		509	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
		510
		511	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		512	{
		513	ssize_t res;
		514	off_t ooffset;
		515
		516	pthread_mutex_lock (&preadwritelock);
		517	ooffset = lseek (fd, 0, SEEK_CUR);
		518	lseek (fd, offset, SEEK_SET);
		519	res = read (fd, buf, count);
		520	lseek (fd, ooffset, SEEK_SET);
		521	pthread_mutex_unlock (&preadwritelock);
		522
		523	return res;
		524	}
		525
		526	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		527	{
		528	ssize_t res;
		529	off_t ooffset;
		530
		531	pthread_mutex_lock (&preadwritelock);
		532	ooffset = lseek (fd, 0, SEEK_CUR);
		533	lseek (fd, offset, SEEK_SET);
		534	res = write (fd, buf, count);
		535	lseek (fd, offset, SEEK_SET);
		536	pthread_mutex_unlock (&preadwritelock);
		537
		538	return res;
		539	}
		540	#endif
		541
		542	#if !HAVE_FDATASYNC
		543	# define fdatasync fsync
		544	#endif
		545
		546	#if !HAVE_READAHEAD
		547	# define readahead aio_readahead
		548
		549	static ssize_t readahead (int fd, off_t offset, size_t count)
		550	{
		551	char readahead_buf[4096];
		552
		553	while (count > 0)
		554	{
		555	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
		556
		557	pread (fd, readahead_buf, len, offset);
244	dataoffset += svlen;	558	offset += len;
245		559	count -= len;
246	if (dataoffset < 0 || dataoffset > svlen)
247	croak ("data offset outside of string");
248
249	if (dowrite)
250	{	560	}
251	/* write: check length and adjust. */	561
252	if (length < 0 || length + dataoffset > svlen)	562	errno = 0;
253	length = svlen - dataoffset;	563	}
		564	#endif
		565
		566	#if !HAVE_READDIR_R
		567	# define readdir_r aio_readdir_r
		568
		569	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		570
		571	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		572	{
		573	struct dirent *e;
		574	int errorno;
		575
		576	pthread_mutex_lock (&readdirlock);
		577
		578	e = readdir (dirp);
		579	errorno = errno;
		580
		581	if (e)
		582	{
		583	*res = ent;
		584	strcpy (ent->d_name, e->d_name);
254	}	585	}
255	else	586	else
		587	*res = 0;
		588
		589	pthread_mutex_unlock (&readdirlock);
		590
		591	errno = errorno;
		592	return e ? 0 : -1;
		593	}
		594	#endif
		595
		596	/* sendfile always needs emulation */
		597	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
		598	{
		599	ssize_t res;
		600
		601	if (!count)
		602	return 0;
		603
		604	#if HAVE_SENDFILE
		605	# if __linux
		606	res = sendfile (ofd, ifd, &offset, count);
		607
		608	# elif __freebsd
		609	/*
		610	* Of course, the freebsd sendfile is a dire hack with no thoughts
		611	* wasted on making it similar to other I/O functions.
		612	*/
256	{	613	{
257	/* read: grow scalar as necessary */	614	off_t sbytes;
258	svptr = SvGROW (data, length + dataoffset);	615	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		616
		617	if (res < 0 && sbytes)
		618	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
		619	res = sbytes;
		620	}
		621
		622	# elif __hpux
		623	res = sendfile (ofd, ifd, offset, count, 0, 0);
		624
		625	# elif __solaris
		626	{
		627	struct sendfilevec vec;
		628	size_t sbytes;
		629
		630	vec.sfv_fd = ifd;
		631	vec.sfv_flag = 0;
		632	vec.sfv_off = offset;
		633	vec.sfv_len = count;
		634
		635	res = sendfilev (ofd, &vec, 1, &sbytes);
		636
		637	if (res < 0 && sbytes)
		638	res = sbytes;
		639	}
		640
		641	# endif
		642	#else
		643	res = -1;
		644	errno = ENOSYS;
		645	#endif
		646
		647	if (res < 0
		648	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		649	#if __solaris
		650	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		651	#endif
		652	)
		653	)
259	}	654	{
		655	/* emulate sendfile. this is a major pain in the ass */
		656	char buf[4096];
		657	res = 0;
260		658
261	if (length < 0)	659	while (count)
262	croak ("length must not be negative");	660	{
		661	ssize_t cnt;
		662
		663	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
263		664
264	Newz (0, req, 1, aio_cb);	665	if (cnt <= 0)
		666	{
		667	if (cnt && !res) res = -1;
		668	break;
		669	}
265		670
		671	cnt = write (ofd, buf, cnt);
		672
		673	if (cnt <= 0)
		674	{
		675	if (cnt && !res) res = -1;
		676	break;
		677	}
		678
		679	offset += cnt;
		680	res += cnt;
		681	count -= cnt;
		682	}
		683	}
		684
		685	return res;
		686	}
		687
		688	/* read a full directory */
		689	static int scandir_ (const char *path, void **namesp)
		690	{
		691	DIR *dirp = opendir (path);
		692	union
		693	{
		694	struct dirent d;
		695	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		696	} u;
		697	struct dirent *entp;
		698	char *name, *names;
		699	int memlen = 4096;
		700	int memofs = 0;
		701	int res = 0;
		702	int errorno;
		703
266	if (!req)	704	if (!dirp)
267	croak ("out of memory during aio_req allocation");	705	return -1;
268		706
269	req->type = dowrite ? REQ_WRITE : REQ_READ;	707	names = malloc (memlen);
270	req->fd = fd;
271	req->offset = offset;
272	req->length = length;
273	req->data = SvREFCNT_inc (data);
274	req->dataptr = (char *)svptr + dataoffset;
275	req->callback = SvREFCNT_inc (callback);
276		708
277	send_req (req);	709	for (;;)
278	}	710	{
		711	errno = 0, readdir_r (dirp, &u.d, &entp);
279		712
280	static void *	713	if (!entp)
		714	break;
		715
		716	name = entp->d_name;
		717
		718	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		719	{
		720	int len = strlen (name) + 1;
		721
		722	res++;
		723
		724	while (memofs + len > memlen)
		725	{
		726	memlen *= 2;
		727	names = realloc (names, memlen);
		728	if (!names)
		729	break;
		730	}
		731
		732	memcpy (names + memofs, name, len);
		733	memofs += len;
		734	}
		735	}
		736
		737	errorno = errno;
		738	closedir (dirp);
		739
		740	if (errorno)
		741	{
		742	free (names);
		743	errno = errorno;
		744	res = -1;
		745	}
		746
		747	*namesp = (void *)names;
		748	return res;
		749	}
		750
		751	/*****************************************************************************/
		752
281	aio_proc (void *thr_arg)	753	static void *aio_proc (void *thr_arg)
282	{	754	{
283	aio_req req;	755	aio_req req;
284	int type;	756	int type;
285		757
286	do	758	do
…		…
305		777
306	pthread_mutex_unlock (&reqlock);	778	pthread_mutex_unlock (&reqlock);
307		779
308	errno = 0; /* strictly unnecessary */	780	errno = 0; /* strictly unnecessary */
309		781
310	type = req->type;	782	if (!req->cancelled)
311
312	switch (type)	783	switch (req->type)
313	{	784	{
314	case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break;	785	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
315	case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break;	786	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
316	#if SYS_readahead	787
317	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	788	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
318	#else	789	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
319	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
320	#endif
321		790
322	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	791	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
323	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	792	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
324	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	793	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
325		794
326	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	795	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
327	case REQ_CLOSE: req->result = close (req->fd); break;	796	case REQ_CLOSE: req->result = close (req->fd); break;
328	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	797	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
329
330	case REQ_FSYNC: req->result = fsync (req->fd); break;	798	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		799	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		800	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
		801	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
		802
331	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	803	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
		804	case REQ_FSYNC: req->result = fsync (req->fd); break;
		805	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
332		806
		807	case REQ_SLEEP:
		808	{
		809	struct timeval tv;
		810
		811	tv.tv_sec = req->fd;
		812	tv.tv_usec = req->fd2;
		813
		814	req->result = select (0, 0, 0, 0, &tv);
		815	}
		816
333	case REQ_QUIT:	817	case REQ_QUIT:
334	break;	818	break;
335		819
336	default:	820	default:
337	req->result = ENOSYS;	821	req->result = ENOSYS;
338	break;	822	break;
339	}	823	}
340		824
341	req->errorno = errno;	825	req->errorno = errno;
342		826
343	pthread_mutex_lock (&reslock);	827	pthread_mutex_lock (&reslock);
344		828
…		…
362	while (type != REQ_QUIT);	846	while (type != REQ_QUIT);
363		847
364	return 0;	848	return 0;
365	}	849	}
366		850
		851	/*****************************************************************************/
		852
		853	static void atfork_prepare (void)
		854	{
		855	pthread_mutex_lock (&reqlock);
		856	pthread_mutex_lock (&reslock);
		857	#if !HAVE_PREADWRITE
		858	pthread_mutex_lock (&preadwritelock);
		859	#endif
		860	#if !HAVE_READDIR_R
		861	pthread_mutex_lock (&readdirlock);
		862	#endif
		863	}
		864
		865	static void atfork_parent (void)
		866	{
		867	#if !HAVE_READDIR_R
		868	pthread_mutex_unlock (&readdirlock);
		869	#endif
		870	#if !HAVE_PREADWRITE
		871	pthread_mutex_unlock (&preadwritelock);
		872	#endif
		873	pthread_mutex_unlock (&reslock);
		874	pthread_mutex_unlock (&reqlock);
		875	}
		876
		877	static void atfork_child (void)
		878	{
		879	aio_req prv;
		880
		881	started = 0;
		882
		883	while (reqs)
		884	{
		885	prv = reqs;
		886	reqs = prv->next;
		887	req_free (prv);
		888	}
		889
		890	reqs = reqe = 0;
		891
		892	while (ress)
		893	{
		894	prv = ress;
		895	ress = prv->next;
		896	req_free (prv);
		897	}
		898
		899	ress = rese = 0;
		900
		901	close (respipe [0]);
		902	close (respipe [1]);
		903	create_pipe ();
		904
		905	atfork_parent ();
		906	}
		907
		908	#define dREQ \
		909	aio_req req; \
		910	\
		911	if (SvOK (callback) && !SvROK (callback)) \
		912	croak ("callback must be undef or of reference type"); \
		913	\
		914	Newz (0, req, 1, aio_cb); \
		915	if (!req) \
		916	croak ("out of memory during aio_req allocation"); \
		917	\
		918	req->callback = newSVsv (callback)
		919
		920	#define REQ_SEND \
		921	req_send (req); \
		922	\
		923	if (GIMME_V != G_VOID) \
		924	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		925
367	MODULE = IO::AIO PACKAGE = IO::AIO	926	MODULE = IO::AIO PACKAGE = IO::AIO
368		927
369	PROTOTYPES: ENABLE	928	PROTOTYPES: ENABLE
370		929
371	BOOT:	930	BOOT:
372	{	931	{
373	if (pipe (respipe))	932	HV *stash = gv_stashpv ("IO::AIO", 1);
374	croak ("unable to initialize result pipe");	933	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		934	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		935	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
375		936
376	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	937	create_pipe ();
377	croak ("cannot set result pipe to nonblocking mode");	938	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
378
379	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
380	croak ("cannot set result pipe to nonblocking mode");
381	}	939	}
382		940
383	void	941	void
384	min_parallel(nthreads)	942	min_parallel (nthreads)
385	int nthreads	943	int nthreads
386	PROTOTYPE: $	944	PROTOTYPE: $
387	CODE:
388	while (nthreads > started)
389	start_thread ();
390		945
391	void	946	void
392	max_parallel(nthreads)	947	max_parallel (nthreads)
393	int nthreads	948	int nthreads
394	PROTOTYPE: $	949	PROTOTYPE: $
395	CODE:
396	{
397	int cur = started;
398	while (cur > nthreads)
399	{
400	end_thread ();
401	cur--;
402	}
403
404	while (started > nthreads)
405	{
406	poll_wait ();
407	poll_cb ();
408	}
409	}
410		950
411	int	951	int
412	max_outstanding(nreqs)	952	max_outstanding (nreqs)
413	int nreqs	953	int nreqs
414	PROTOTYPE: $	954	PROTOTYPE: $
415	CODE:	955	CODE:
416	RETVAL = max_outstanding;	956	RETVAL = max_outstanding;
417	max_outstanding = nreqs;	957	max_outstanding = nreqs;
418		958
419	void	959	void
420	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	960	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
421	SV * pathname	961	SV * pathname
422	int flags	962	int flags
423	int mode	963	int mode
424	SV * callback	964	SV * callback
425	PROTOTYPE: $$$;$	965	PROTOTYPE: $$$;$
426	CODE:	966	PPCODE:
427	{	967	{
428	aio_req req;	968	dREQ;
429
430	Newz (0, req, 1, aio_cb);
431
432	if (!req)
433	croak ("out of memory during aio_req allocation");
434		969
435	req->type = REQ_OPEN;	970	req->type = REQ_OPEN;
436	req->data = newSVsv (pathname);	971	req->data = newSVsv (pathname);
437	req->dataptr = SvPV_nolen (req->data);	972	req->dataptr = SvPVbyte_nolen (req->data);
438	req->fd = flags;	973	req->fd = flags;
439	req->mode = mode;	974	req->mode = mode;
440	req->callback = SvREFCNT_inc (callback);
441		975
442	send_req (req);	976	REQ_SEND;
443	}	977	}
444		978
445	void	979	void
446	aio_close(fh,callback=&PL_sv_undef)	980	aio_close (fh,callback=&PL_sv_undef)
447	InputStream fh	981	SV * fh
448	SV * callback	982	SV * callback
449	PROTOTYPE: $;$	983	PROTOTYPE: $;$
450	ALIAS:	984	ALIAS:
451	aio_close = REQ_CLOSE	985	aio_close = REQ_CLOSE
452	aio_fsync = REQ_FSYNC	986	aio_fsync = REQ_FSYNC
453	aio_fdatasync = REQ_FDATASYNC	987	aio_fdatasync = REQ_FDATASYNC
454	CODE:	988	PPCODE:
		989	{
		990	dREQ;
		991
		992	req->type = ix;
		993	req->fh = newSVsv (fh);
		994	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
		995
		996	REQ_SEND (req);
		997	}
		998
		999	void
		1000	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
		1001	SV * fh
		1002	UV offset
		1003	UV length
		1004	SV * data
		1005	UV dataoffset
		1006	SV * callback
		1007	ALIAS:
		1008	aio_read = REQ_READ
		1009	aio_write = REQ_WRITE
		1010	PROTOTYPE: $$$$$;$
		1011	PPCODE:
455	{	1012	{
456	aio_req req;	1013	aio_req req;
		1014	STRLEN svlen;
		1015	char *svptr = SvPVbyte (data, svlen);
457		1016
458	Newz (0, req, 1, aio_cb);	1017	SvUPGRADE (data, SVt_PV);
		1018	SvPOK_on (data);
459		1019
460	if (!req)	1020	if (dataoffset < 0)
461	croak ("out of memory during aio_req allocation");	1021	dataoffset += svlen;
462		1022
463	req->type = ix;	1023	if (dataoffset < 0 || dataoffset > svlen)
464	req->fd = PerlIO_fileno (fh);	1024	croak ("data offset outside of string");
465	req->callback = SvREFCNT_inc (callback);
466		1025
467	send_req (req);	1026	if (ix == REQ_WRITE)
468	}	1027	{
469		1028	/* write: check length and adjust. */
470	void	1029	if (length < 0 || length + dataoffset > svlen)
471	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1030	length = svlen - dataoffset;
472	InputStream fh	1031	}
473	UV offset	1032	else
474	IV length	1033	{
475	SV * data	1034	/* read: grow scalar as necessary */
476	IV dataoffset	1035	svptr = SvGROW (data, length + dataoffset);
477	SV * callback	1036	}
478	PROTOTYPE: $$$$$;$
479	CODE:
480	read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
481
482	void
483	aio_write(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
484	OutputStream fh
485	UV offset
486	IV length
487	SV * data
488	IV dataoffset
489	SV * callback
490	PROTOTYPE: $$$$$;$
491	CODE:
492	read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
493
494	void
495	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
496	InputStream fh
497	UV offset
498	IV length
499	SV * callback
500	PROTOTYPE: $$$;$
501	CODE:
502	{
503	aio_req req;
504		1037
505	if (length < 0)	1038	if (length < 0)
506	croak ("length must not be negative");	1039	croak ("length must not be negative");
507		1040
508	Newz (0, req, 1, aio_cb);	1041	{
		1042	dREQ;
509		1043
510	if (!req)	1044	req->type = ix;
511	croak ("out of memory during aio_req allocation");	1045	req->fh = newSVsv (fh);
		1046	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
		1047	: IoOFP (sv_2io (fh)));
		1048	req->offset = offset;
		1049	req->length = length;
		1050	req->data = SvREFCNT_inc (data);
		1051	req->dataptr = (char *)svptr + dataoffset;
		1052
		1053	if (!SvREADONLY (data))
		1054	{
		1055	SvREADONLY_on (data);
		1056	req->data2ptr = (void *)data;
		1057	}
		1058
		1059	REQ_SEND;
		1060	}
		1061	}
		1062
		1063	void
		1064	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1065	SV * out_fh
		1066	SV * in_fh
		1067	UV in_offset
		1068	UV length
		1069	SV * callback
		1070	PROTOTYPE: $$$$;$
		1071	PPCODE:
		1072	{
		1073	dREQ;
		1074
		1075	req->type = REQ_SENDFILE;
		1076	req->fh = newSVsv (out_fh);
		1077	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1078	req->fh2 = newSVsv (in_fh);
		1079	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1080	req->offset = in_offset;
		1081	req->length = length;
		1082
		1083	REQ_SEND;
		1084	}
		1085
		1086	void
		1087	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
		1088	SV * fh
		1089	UV offset
		1090	IV length
		1091	SV * callback
		1092	PROTOTYPE: $$$;$
		1093	PPCODE:
		1094	{
		1095	dREQ;
512		1096
513	req->type = REQ_READAHEAD;	1097	req->type = REQ_READAHEAD;
		1098	req->fh = newSVsv (fh);
514	req->fd = PerlIO_fileno (fh);	1099	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
515	req->offset = offset;	1100	req->offset = offset;
516	req->length = length;	1101	req->length = length;
517	req->callback = SvREFCNT_inc (callback);
518		1102
519	send_req (req);	1103	REQ_SEND;
520	}	1104	}
521		1105
522	void	1106	void
523	aio_stat(fh_or_path,callback=&PL_sv_undef)	1107	aio_stat (fh_or_path,callback=&PL_sv_undef)
524	SV * fh_or_path	1108	SV * fh_or_path
525	SV * callback	1109	SV * callback
526	ALIAS:	1110	ALIAS:
527	aio_stat = REQ_STAT	1111	aio_stat = REQ_STAT
528	aio_lstat = REQ_LSTAT	1112	aio_lstat = REQ_LSTAT
529	CODE:	1113	PPCODE:
530	{	1114	{
531	aio_req req;	1115	dREQ;
532
533	Newz (0, req, 1, aio_cb);
534
535	if (!req)
536	croak ("out of memory during aio_req allocation");
537		1116
538	New (0, req->statdata, 1, Stat_t);	1117	New (0, req->statdata, 1, Stat_t);
539
540	if (!req->statdata)	1118	if (!req->statdata)
		1119	{
		1120	req_free (req);
541	croak ("out of memory during aio_req->statdata allocation");	1121	croak ("out of memory during aio_req->statdata allocation");
		1122	}
542		1123
543	if (SvPOK (fh_or_path))	1124	if (SvPOK (fh_or_path))
544	{	1125	{
545	req->type = ix;	1126	req->type = ix;
546	req->data = newSVsv (fh_or_path);	1127	req->data = newSVsv (fh_or_path);
547	req->dataptr = SvPV_nolen (req->data);	1128	req->dataptr = SvPVbyte_nolen (req->data);
548	}	1129	}
549	else	1130	else
550	{	1131	{
551	req->type = REQ_FSTAT;	1132	req->type = REQ_FSTAT;
		1133	req->fh = newSVsv (fh_or_path);
552	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1134	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
553	}	1135	}
554		1136
555	req->callback = SvREFCNT_inc (callback);	1137	REQ_SEND;
556
557	send_req (req);
558	}	1138	}
559		1139
560	void	1140	void
561	aio_unlink(pathname,callback=&PL_sv_undef)	1141	aio_unlink (pathname,callback=&PL_sv_undef)
562	SV * pathname	1142	SV * pathname
563	SV * callback	1143	SV * callback
		1144	ALIAS:
		1145	aio_unlink = REQ_UNLINK
		1146	aio_rmdir = REQ_RMDIR
		1147	aio_readdir = REQ_READDIR
564	CODE:	1148	PPCODE:
565	{	1149	{
566	aio_req req;	1150	dREQ;
567		1151
568	Newz (0, req, 1, aio_cb);	1152	req->type = ix;
		1153	req->data = newSVsv (pathname);
		1154	req->dataptr = SvPVbyte_nolen (req->data);
569		1155
570	if (!req)	1156	REQ_SEND;
571	croak ("out of memory during aio_req allocation");	1157	}
		1158
		1159	void
		1160	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1161	SV * oldpath
		1162	SV * newpath
		1163	SV * callback
		1164	ALIAS:
		1165	aio_link = REQ_LINK
		1166	aio_symlink = REQ_SYMLINK
		1167	aio_rename = REQ_RENAME
		1168	PPCODE:
		1169	{
		1170	dREQ;
572		1171
573	req->type = REQ_UNLINK;	1172	req->type = ix;
		1173	req->fh = newSVsv (oldpath);
		1174	req->data2ptr = SvPVbyte_nolen (req->fh);
574	req->data = newSVsv (pathname);	1175	req->data = newSVsv (newpath);
575	req->dataptr = SvPV_nolen (req->data);	1176	req->dataptr = SvPVbyte_nolen (req->data);
576	req->callback = SvREFCNT_inc (callback);
577		1177
578	send_req (req);	1178	REQ_SEND;
579	}	1179	}
580		1180
581	void	1181	void
		1182	aio_sleep (delay,callback=&PL_sv_undef)
		1183	double delay
		1184	SV * callback
		1185	PPCODE:
		1186	{
		1187	dREQ;
		1188
		1189	req->type = REQ_SLEEP;
		1190	req->fd = delay < 0. ? 0 : delay;
		1191	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1192
		1193	REQ_SEND;
		1194	}
		1195
		1196	void
		1197	aio_group (callback=&PL_sv_undef)
		1198	SV * callback
		1199	PROTOTYPE: ;$
		1200	PPCODE:
		1201	{
		1202	dREQ;
		1203	req->type = REQ_GROUP;
		1204	req_send (req);
		1205	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1206	}
		1207
		1208	void
582	flush()	1209	flush ()
583	PROTOTYPE:	1210	PROTOTYPE:
584	CODE:	1211	CODE:
585	while (nreqs)	1212	while (nreqs)
586	{	1213	{
587	poll_wait ();	1214	poll_wait ();
…		…
627	CODE:	1254	CODE:
628	RETVAL = nreqs;	1255	RETVAL = nreqs;
629	OUTPUT:	1256	OUTPUT:
630	RETVAL	1257	RETVAL
631		1258
		1259	PROTOTYPES: DISABLE
		1260
		1261	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1262
		1263	void
		1264	cancel (aio_req_ornot req)
		1265	PROTOTYPE:
		1266	CODE:
		1267	req_cancel (req);
		1268
		1269	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1270
		1271	void
		1272	add (aio_req grp, ...)
		1273	PPCODE:
		1274	{
		1275	int i;
		1276
		1277	if (grp->fd == 2)
		1278	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1279
		1280	for (i = 1; i < items; ++i )
		1281	{
		1282	if (GIMME_V != G_VOID)
		1283	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1284
		1285	aio_req req = SvAIO_REQ (ST (i));
		1286
		1287	if (req)
		1288	{
		1289	++grp->length;
		1290	req->grp = grp;
		1291
		1292	req->grp_prev = 0;
		1293	req->grp_next = grp->grp_first;
		1294
		1295	if (grp->grp_first)
		1296	grp->grp_first->grp_prev = req;
		1297
		1298	grp->grp_first = req;
		1299	}
		1300	}
		1301	}
		1302
		1303	void
		1304	result (aio_req grp, ...)
		1305	CODE:
		1306	{
		1307	int i;
		1308	AV *av = newAV ();
		1309
		1310	for (i = 1; i < items; ++i )
		1311	av_push (av, newSVsv (ST (i)));
		1312
		1313	SvREFCNT_dec (grp->data);
		1314	grp->data = (SV *)av;
		1315	}
		1316
		1317	void
		1318	feeder_limit (aio_req grp, int limit)
		1319	CODE:
		1320	grp->fd2 = limit;
		1321	aio_grp_feed (grp);
		1322
		1323	void
		1324	set_feeder (aio_req grp, SV *callback=&PL_sv_undef)
		1325	CODE:
		1326	{
		1327	SvREFCNT_dec (grp->fh2);
		1328	grp->fh2 = newSVsv (callback);
		1329
		1330	if (grp->fd2 <= 0)
		1331	grp->fd2 = 2;
		1332
		1333	aio_grp_feed (grp);
		1334	}
		1335

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