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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.15 by root, Sat Jul 23 18:19:56 2005 UTC vs.
Revision 1.54 by root, Mon Oct 23 00:34:36 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>
7		18	#include <limits.h>
8	#include <unistd.h>	19	#include <unistd.h>
9	#include <fcntl.h>	20	#include <fcntl.h>
10	#include <signal.h>	21	#include <signal.h>
11	#include <sched.h>	22	#include <sched.h>
		23
		24	#if HAVE_SENDFILE
12	#if __linux	25	# if __linux
		26	# include <sys/sendfile.h>
		27	# elif __freebsd
13	#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
14	#endif	37	#endif
15		38
16	#include <pthread.h>	39	/* used for struct dirent, AIX doesn't provide it */
17		40	#ifndef NAME_MAX
18	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	41	# define NAME_MAX 4096
19	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	42	#endif
20	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
21		43
22	#if __ia64	44	#if __ia64
23	# define STACKSIZE 65536	45	# define STACKSIZE 65536
24	#else	46	#else
25	# define STACKSIZE 4096	47	# define STACKSIZE 8192
26	#endif	48	#endif
27		49
28	enum {	50	enum {
29	REQ_QUIT,	51	REQ_QUIT,
30	REQ_OPEN, REQ_CLOSE,	52	REQ_OPEN, REQ_CLOSE,
31	REQ_READ, REQ_WRITE, REQ_READAHEAD,	53	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		54	REQ_SENDFILE,
32	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
33	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,
34	};	62	};
35		63
		64	#define AIO_REQ_KLASS "IO::AIO::REQ"
		65	#define AIO_GRP_KLASS "IO::AIO::GRP"
		66
36	typedef struct aio_cb {	67	typedef struct aio_cb
		68	{
37	struct aio_cb *volatile next;	69	struct aio_cb *volatile next;
38		70
39	int type;	71	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
40		72
41	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;
42	off_t offset;	79	off_t offset;
43	size_t length;	80	size_t length;
44	ssize_t result;	81	ssize_t result;
		82
		83	int type;
		84	int fd, fd2;
		85	int errorno;
		86	STRLEN dataoffset;
45	mode_t mode; /* open */	87	mode_t mode; /* open */
46	int errorno;	88	unsigned char cancelled;
47	SV *data, *callback, *fh;
48	void *dataptr;
49	STRLEN dataoffset;
50
51	Stat_t *statdata;
52	} aio_cb;	89	} aio_cb;
53		90
54	typedef aio_cb *aio_req;	91	typedef aio_cb *aio_req;
		92	typedef aio_cb *aio_req_ornot;
55		93
56	static int started;	94	static int started, wanted;
57	static volatile int nreqs;	95	static volatile int nreqs;
58	static int max_outstanding = 1<<30;	96	static int max_outstanding = 1<<30;
59	static int respipe [2];	97	static int respipe [2];
60		98
61	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	99	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
…		…
63	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	101	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
64		102
65	static volatile aio_req reqs, reqe; /* queue start, queue end */	103	static volatile aio_req reqs, reqe; /* queue start, queue end */
66	static volatile aio_req ress, rese; /* queue start, queue end */	104	static volatile aio_req ress, rese; /* queue start, queue end */
67		105
68	static void	106	static void req_invoke (aio_req req);
69	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 ()
70	{	180	{
71	if (nreqs && !ress)	181	if (nreqs && !ress)
72	{	182	{
73	fd_set rfd;	183	fd_set rfd;
74	FD_ZERO(&rfd);	184	FD_ZERO(&rfd);
…		…
76		186
77	select (respipe [0] + 1, &rfd, 0, 0, 0);	187	select (respipe [0] + 1, &rfd, 0, 0, 0);
78	}	188	}
79	}	189	}
80		190
81	static int	191	static void req_invoke (aio_req req)
82	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 ()
83	{	338	{
84	dSP;	339	dSP;
85	int count = 0;	340	int count = 0;
		341	int do_croak = 0;
86	aio_req req, prv;	342	aio_req req;
87		343
		344	for (;;)
		345	{
88	pthread_mutex_lock (&reslock);	346	pthread_mutex_lock (&reslock);
		347	req = ress;
89		348
90	{	349	if (req)
		350	{
		351	ress = req->next;
		352
		353	if (!ress)
		354	{
91	/* read any signals sent by the worker threads */	355	/* read any signals sent by the worker threads */
92	char buf [32];	356	char buf [32];
93	while (read (respipe [0], buf, 32) > 0)	357	while (read (respipe [0], buf, 32) == 32)
		358	;
		359
		360	rese = 0;
		361	}
94	;	362	}
95	}
96		363
97	req = ress;
98	ress = rese = 0;
99
100	pthread_mutex_unlock (&reslock);	364	pthread_mutex_unlock (&reslock);
101		365
102	while (req)	366	if (!req)
103	{	367	break;
		368
104	nreqs--;	369	--nreqs;
105		370
106	if (req->type == REQ_QUIT)	371	if (req->type == REQ_QUIT)
107	started--;	372	started--;
		373	else if (req->type == REQ_GROUP && req->length)
		374	{
		375	req->fd = 1; /* mark request as delayed */
		376	continue;
		377	}
108	else	378	else
109	{	379	{
110	int errorno = errno;
111	errno = req->errorno;
112
113	if (req->type == REQ_READ)	380	if (req->type == REQ_READ)
114	SvCUR_set (req->data, req->dataoffset	381	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
115	+ req->result > 0 ? req->result : 0);
116		382
		383	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		384	SvREADONLY_off (req->data);
		385
117	if (req->data)	386	if (req->statdata)
118	SvREFCNT_dec (req->data);
119
120	if (req->fh)
121	SvREFCNT_dec (req->fh);
122
123	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
124	{	387	{
125	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	388	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
126	PL_laststatval = req->result;	389	PL_laststatval = req->result;
127	PL_statcache = *(req->statdata);	390	PL_statcache = *(req->statdata);
128
129	Safefree (req->statdata);
130	}	391	}
131		392
132	ENTER;	393	req_invoke (req);
133	PUSHMARK (SP);
134	XPUSHs (sv_2mortal (newSViv (req->result)));
135		394
136	if (req->type == REQ_OPEN)
137	{
138	/* convert fd to fh */
139	SV *fh;
140
141	PUTBACK;
142	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
143	SPAGAIN;
144
145	fh = SvREFCNT_inc (POPs);
146
147	PUSHMARK (SP);
148	XPUSHs (sv_2mortal (fh));
149	}
150
151	if (SvOK (req->callback))
152	{
153	PUTBACK;
154	call_sv (req->callback, G_VOID | G_EVAL);
155	SPAGAIN;
156	}
157
158	LEAVE;
159
160	if (req->callback)
161	SvREFCNT_dec (req->callback);
162
163	errno = errorno;
164	count++;	395	count++;
165	}	396	}
166		397
167	prv = req;
168	req = req->next;
169	Safefree (prv);	398	req_free (req);
170
171	/* TODO: croak on errors? */
172	}	399	}
173		400
174	return count;	401	return count;
175	}	402	}
176		403
177	static void *aio_proc(void *arg);	404	static void *aio_proc(void *arg);
178		405
179	static void
180	start_thread (void)	406	static void start_thread (void)
181	{	407	{
182	sigset_t fullsigset, oldsigset;	408	sigset_t fullsigset, oldsigset;
183	pthread_t tid;	409	pthread_t tid;
184	pthread_attr_t attr;	410	pthread_attr_t attr;
185		411
…		…
194	started++;	420	started++;
195		421
196	sigprocmask (SIG_SETMASK, &oldsigset, 0);	422	sigprocmask (SIG_SETMASK, &oldsigset, 0);
197	}	423	}
198		424
199	static void	425	static void req_send (aio_req req)
200	send_req (aio_req req)
201	{	426	{
		427	while (started < wanted && nreqs >= started)
		428	start_thread ();
		429
202	nreqs++;	430	++nreqs;
203		431
204	pthread_mutex_lock (&reqlock);	432	pthread_mutex_lock (&reqlock);
205		433
206	req->next = 0;	434	req->next = 0;
207		435
…		…
214	reqe = reqs = req;	442	reqe = reqs = req;
215		443
216	pthread_cond_signal (&reqwait);	444	pthread_cond_signal (&reqwait);
217	pthread_mutex_unlock (&reqlock);	445	pthread_mutex_unlock (&reqlock);
218		446
219	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)
220	{	488	{
221	poll_wait ();	489	poll_wait ();
222	poll_cb ();	490	poll_cb ();
223	}	491	}
224	}	492	}
225		493
226	static void	494	static void create_pipe ()
227	end_thread (void)
228	{	495	{
229	aio_req req;	496	if (pipe (respipe))
230	New (0, req, 1, aio_cb);	497	croak ("unable to initialize result pipe");
231	req->type = REQ_QUIT;
232		498
233	send_req (req);	499	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
234	}	500	croak ("cannot set result pipe to nonblocking mode");
235		501
236	static void *	502	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		503	croak ("cannot set result pipe to nonblocking mode");
		504	}
		505
		506	/*****************************************************************************/
		507	/* work around various missing functions */
		508
		509	#if !HAVE_PREADWRITE
		510	# define pread aio_pread
		511	# define pwrite aio_pwrite
		512
		513	/*
		514	* make our pread/pwrite safe against themselves, but not against
		515	* normal read/write by using a mutex. slows down execution a lot,
		516	* but that's your problem, not mine.
		517	*/
		518	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
		519
		520	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		521	{
		522	ssize_t res;
		523	off_t ooffset;
		524
		525	pthread_mutex_lock (&preadwritelock);
		526	ooffset = lseek (fd, 0, SEEK_CUR);
		527	lseek (fd, offset, SEEK_SET);
		528	res = read (fd, buf, count);
		529	lseek (fd, ooffset, SEEK_SET);
		530	pthread_mutex_unlock (&preadwritelock);
		531
		532	return res;
		533	}
		534
		535	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		536	{
		537	ssize_t res;
		538	off_t ooffset;
		539
		540	pthread_mutex_lock (&preadwritelock);
		541	ooffset = lseek (fd, 0, SEEK_CUR);
		542	lseek (fd, offset, SEEK_SET);
		543	res = write (fd, buf, count);
		544	lseek (fd, offset, SEEK_SET);
		545	pthread_mutex_unlock (&preadwritelock);
		546
		547	return res;
		548	}
		549	#endif
		550
		551	#if !HAVE_FDATASYNC
		552	# define fdatasync fsync
		553	#endif
		554
		555	#if !HAVE_READAHEAD
		556	# define readahead aio_readahead
		557
		558	static ssize_t readahead (int fd, off_t offset, size_t count)
		559	{
		560	char readahead_buf[4096];
		561
		562	while (count > 0)
		563	{
		564	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
		565
		566	pread (fd, readahead_buf, len, offset);
		567	offset += len;
		568	count -= len;
		569	}
		570
		571	errno = 0;
		572	}
		573	#endif
		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
		760	/*****************************************************************************/
		761
237	aio_proc (void *thr_arg)	762	static void *aio_proc (void *thr_arg)
238	{	763	{
239	aio_req req;	764	aio_req req;
240	int type;	765	int type;
241		766
242	do	767	do
…		…
261		786
262	pthread_mutex_unlock (&reqlock);	787	pthread_mutex_unlock (&reqlock);
263		788
264	errno = 0; /* strictly unnecessary */	789	errno = 0; /* strictly unnecessary */
265		790
266	type = req->type;	791	if (!req->cancelled)
267		792	switch (type = req->type) /* remember type for QUIT check */
268	switch (type)
269	{	793	{
270	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;
271	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;
272	#if SYS_readahead	796
273	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;
274	#else	798	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
275	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
276	#endif
277		799
278	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	800	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
279	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	801	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
280	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	802	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
281		803
282	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;
283	case REQ_CLOSE: req->result = close (req->fd); break;	805	case REQ_CLOSE: req->result = close (req->fd); break;
284	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	806	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
285
286	case REQ_FSYNC: req->result = fsync (req->fd); 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;
		810	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
		811
287	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	812	case REQ_FDATASYNC: req->result = fdatasync (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;
288		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: /*TODO: should not be handled here */
		827	case REQ_NOP: /*TODO: should not be handled here */
289	case REQ_QUIT:	828	case REQ_QUIT:
290	break;	829	break;
291		830
292	default:	831	default:
293	req->result = ENOSYS;	832	req->result = ENOSYS;
294	break;	833	break;
295	}	834	}
296		835
297	req->errorno = errno;	836	req->errorno = errno;
298		837
299	pthread_mutex_lock (&reslock);	838	pthread_mutex_lock (&reslock);
300		839
…		…
318	while (type != REQ_QUIT);	857	while (type != REQ_QUIT);
319		858
320	return 0;	859	return 0;
321	}	860	}
322		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
		919	#define dREQ \
		920	aio_req req; \
		921	\
		922	if (SvOK (callback) && !SvROK (callback)) \
		923	croak ("callback must be undef or of reference type"); \
		924	\
		925	Newz (0, req, 1, aio_cb); \
		926	if (!req) \
		927	croak ("out of memory during aio_req allocation"); \
		928	\
		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));
		936
323	MODULE = IO::AIO PACKAGE = IO::AIO	937	MODULE = IO::AIO PACKAGE = IO::AIO
324		938
325	PROTOTYPES: ENABLE	939	PROTOTYPES: ENABLE
326		940
327	BOOT:	941	BOOT:
328	{	942	{
329	if (pipe (respipe))	943	HV *stash = gv_stashpv ("IO::AIO", 1);
330	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));
331		947
332	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	948	create_pipe ();
333	croak ("cannot set result pipe to nonblocking mode");	949	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
334
335	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
336	croak ("cannot set result pipe to nonblocking mode");
337	}	950	}
338		951
339	void	952	void
340	min_parallel(nthreads)	953	min_parallel (nthreads)
341	int nthreads	954	int nthreads
342	PROTOTYPE: $	955	PROTOTYPE: $
343	CODE:
344	while (nthreads > started)
345	start_thread ();
346		956
347	void	957	void
348	max_parallel(nthreads)	958	max_parallel (nthreads)
349	int nthreads	959	int nthreads
350	PROTOTYPE: $	960	PROTOTYPE: $
351	CODE:
352	{
353	int cur = started;
354	while (cur > nthreads)
355	{
356	end_thread ();
357	cur--;
358	}
359
360	while (started > nthreads)
361	{
362	poll_wait ();
363	poll_cb ();
364	}
365	}
366		961
367	int	962	int
368	max_outstanding(nreqs)	963	max_outstanding (nreqs)
369	int nreqs	964	int nreqs
370	PROTOTYPE: $	965	PROTOTYPE: $
371	CODE:	966	CODE:
372	RETVAL = max_outstanding;	967	RETVAL = max_outstanding;
373	max_outstanding = nreqs;	968	max_outstanding = nreqs;
374		969
375	void	970	void
376	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	971	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
377	SV * pathname	972	SV * pathname
378	int flags	973	int flags
379	int mode	974	int mode
380	SV * callback	975	SV * callback
381	PROTOTYPE: $$$;$	976	PROTOTYPE: $$$;$
382	CODE:	977	PPCODE:
383	{	978	{
384	aio_req req;	979	dREQ;
385
386	Newz (0, req, 1, aio_cb);
387
388	if (!req)
389	croak ("out of memory during aio_req allocation");
390		980
391	req->type = REQ_OPEN;	981	req->type = REQ_OPEN;
392	req->data = newSVsv (pathname);	982	req->data = newSVsv (pathname);
393	req->dataptr = SvPV_nolen (req->data);	983	req->dataptr = SvPVbyte_nolen (req->data);
394	req->fd = flags;	984	req->fd = flags;
395	req->mode = mode;	985	req->mode = mode;
396	req->callback = SvREFCNT_inc (callback);
397		986
398	send_req (req);	987	REQ_SEND;
399	}	988	}
400		989
401	void	990	void
402	aio_close(fh,callback=&PL_sv_undef)	991	aio_close (fh,callback=&PL_sv_undef)
403	SV * fh	992	SV * fh
404	SV * callback	993	SV * callback
405	PROTOTYPE: $;$	994	PROTOTYPE: $;$
406	ALIAS:	995	ALIAS:
407	aio_close = REQ_CLOSE	996	aio_close = REQ_CLOSE
408	aio_fsync = REQ_FSYNC	997	aio_fsync = REQ_FSYNC
409	aio_fdatasync = REQ_FDATASYNC	998	aio_fdatasync = REQ_FDATASYNC
410	CODE:	999	PPCODE:
411	{	1000	{
412	aio_req req;	1001	dREQ;
413
414	Newz (0, req, 1, aio_cb);
415
416	if (!req)
417	croak ("out of memory during aio_req allocation");
418		1002
419	req->type = ix;	1003	req->type = ix;
420	req->fh = newSVsv (fh);	1004	req->fh = newSVsv (fh);
421	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1005	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
422	req->callback = SvREFCNT_inc (callback);
423		1006
424	send_req (req);	1007	REQ_SEND (req);
425	}	1008	}
426		1009
427	void	1010	void
428	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1011	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
429	SV * fh	1012	SV * fh
430	UV offset	1013	UV offset
431	IV length	1014	UV length
432	SV * data	1015	SV * data
433	IV dataoffset	1016	UV dataoffset
434	SV * callback	1017	SV * callback
435	ALIAS:	1018	ALIAS:
436	aio_read = REQ_READ	1019	aio_read = REQ_READ
437	aio_write = REQ_WRITE	1020	aio_write = REQ_WRITE
438	PROTOTYPE: $$$$$;$	1021	PROTOTYPE: $$$$$;$
439	CODE:	1022	PPCODE:
440	{	1023	{
441	aio_req req;	1024	aio_req req;
442	STRLEN svlen;	1025	STRLEN svlen;
443	char *svptr = SvPV (data, svlen);	1026	char *svptr = SvPVbyte (data, svlen);
444		1027
445	SvUPGRADE (data, SVt_PV);	1028	SvUPGRADE (data, SVt_PV);
446	SvPOK_on (data);	1029	SvPOK_on (data);
447		1030
448	if (dataoffset < 0)	1031	if (dataoffset < 0)
…		…
464	}	1047	}
465		1048
466	if (length < 0)	1049	if (length < 0)
467	croak ("length must not be negative");	1050	croak ("length must not be negative");
468		1051
469	Newz (0, req, 1, aio_cb);	1052	{
		1053	dREQ;
470		1054
471	if (!req)
472	croak ("out of memory during aio_req allocation");
473
474	req->type = ix;	1055	req->type = ix;
475	req->fh = newSVsv (fh);	1056	req->fh = newSVsv (fh);
476	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1057	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
477	: IoOFP (sv_2io (fh)));	1058	: IoOFP (sv_2io (fh)));
478	req->offset = offset;	1059	req->offset = offset;
		1060	req->length = length;
		1061	req->data = SvREFCNT_inc (data);
		1062	req->dataptr = (char *)svptr + dataoffset;
		1063
		1064	if (!SvREADONLY (data))
		1065	{
		1066	SvREADONLY_on (data);
		1067	req->data2ptr = (void *)data;
		1068	}
		1069
		1070	REQ_SEND;
		1071	}
		1072	}
		1073
		1074	void
		1075	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1076	SV * out_fh
		1077	SV * in_fh
		1078	UV in_offset
		1079	UV length
		1080	SV * callback
		1081	PROTOTYPE: $$$$;$
		1082	PPCODE:
		1083	{
		1084	dREQ;
		1085
		1086	req->type = REQ_SENDFILE;
		1087	req->fh = newSVsv (out_fh);
		1088	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1089	req->fh2 = newSVsv (in_fh);
		1090	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1091	req->offset = in_offset;
479	req->length = length;	1092	req->length = length;
480	req->data = SvREFCNT_inc (data);
481	req->dataptr = (char *)svptr + dataoffset;
482	req->callback = SvREFCNT_inc (callback);
483		1093
484	send_req (req);	1094	REQ_SEND;
485	}	1095	}
486		1096
487	void	1097	void
488	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1098	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
489	SV * fh	1099	SV * fh
490	UV offset	1100	UV offset
491	IV length	1101	IV length
492	SV * callback	1102	SV * callback
493	PROTOTYPE: $$$;$	1103	PROTOTYPE: $$$;$
494	CODE:	1104	PPCODE:
495	{	1105	{
496	aio_req req;	1106	dREQ;
497
498	if (length < 0)
499	croak ("length must not be negative");
500
501	Newz (0, req, 1, aio_cb);
502
503	if (!req)
504	croak ("out of memory during aio_req allocation");
505		1107
506	req->type = REQ_READAHEAD;	1108	req->type = REQ_READAHEAD;
507	req->fh = newSVsv (fh);	1109	req->fh = newSVsv (fh);
508	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1110	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
509	req->offset = offset;	1111	req->offset = offset;
510	req->length = length;	1112	req->length = length;
511	req->callback = SvREFCNT_inc (callback);
512		1113
513	send_req (req);	1114	REQ_SEND;
514	}	1115	}
515		1116
516	void	1117	void
517	aio_stat(fh_or_path,callback=&PL_sv_undef)	1118	aio_stat (fh_or_path,callback=&PL_sv_undef)
518	SV * fh_or_path	1119	SV * fh_or_path
519	SV * callback	1120	SV * callback
520	ALIAS:	1121	ALIAS:
521	aio_stat = REQ_STAT	1122	aio_stat = REQ_STAT
522	aio_lstat = REQ_LSTAT	1123	aio_lstat = REQ_LSTAT
523	CODE:	1124	PPCODE:
524	{	1125	{
525	aio_req req;	1126	dREQ;
526
527	Newz (0, req, 1, aio_cb);
528
529	if (!req)
530	croak ("out of memory during aio_req allocation");
531		1127
532	New (0, req->statdata, 1, Stat_t);	1128	New (0, req->statdata, 1, Stat_t);
533
534	if (!req->statdata)	1129	if (!req->statdata)
		1130	{
		1131	req_free (req);
535	croak ("out of memory during aio_req->statdata allocation");	1132	croak ("out of memory during aio_req->statdata allocation");
		1133	}
536		1134
537	if (SvPOK (fh_or_path))	1135	if (SvPOK (fh_or_path))
538	{	1136	{
539	req->type = ix;	1137	req->type = ix;
540	req->data = newSVsv (fh_or_path);	1138	req->data = newSVsv (fh_or_path);
541	req->dataptr = SvPV_nolen (req->data);	1139	req->dataptr = SvPVbyte_nolen (req->data);
542	}	1140	}
543	else	1141	else
544	{	1142	{
545	req->type = REQ_FSTAT;	1143	req->type = REQ_FSTAT;
546	req->fh = newSVsv (fh_or_path);	1144	req->fh = newSVsv (fh_or_path);
547	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1145	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
548	}	1146	}
549		1147
550	req->callback = SvREFCNT_inc (callback);	1148	REQ_SEND;
551
552	send_req (req);
553	}	1149	}
554		1150
555	void	1151	void
556	aio_unlink(pathname,callback=&PL_sv_undef)	1152	aio_unlink (pathname,callback=&PL_sv_undef)
557	SV * pathname	1153	SV * pathname
558	SV * callback	1154	SV * callback
		1155	ALIAS:
		1156	aio_unlink = REQ_UNLINK
		1157	aio_rmdir = REQ_RMDIR
		1158	aio_readdir = REQ_READDIR
559	CODE:	1159	PPCODE:
560	{	1160	{
561	aio_req req;	1161	dREQ;
562		1162
563	Newz (0, req, 1, aio_cb);	1163	req->type = ix;
		1164	req->data = newSVsv (pathname);
		1165	req->dataptr = SvPVbyte_nolen (req->data);
564		1166
565	if (!req)	1167	REQ_SEND;
566	croak ("out of memory during aio_req allocation");	1168	}
		1169
		1170	void
		1171	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1172	SV * oldpath
		1173	SV * newpath
		1174	SV * callback
		1175	ALIAS:
		1176	aio_link = REQ_LINK
		1177	aio_symlink = REQ_SYMLINK
		1178	aio_rename = REQ_RENAME
		1179	PPCODE:
		1180	{
		1181	dREQ;
567		1182
568	req->type = REQ_UNLINK;	1183	req->type = ix;
		1184	req->fh = newSVsv (oldpath);
		1185	req->data2ptr = SvPVbyte_nolen (req->fh);
569	req->data = newSVsv (pathname);	1186	req->data = newSVsv (newpath);
570	req->dataptr = SvPV_nolen (req->data);	1187	req->dataptr = SvPVbyte_nolen (req->data);
571	req->callback = SvREFCNT_inc (callback);
572		1188
573	send_req (req);	1189	REQ_SEND;
574	}	1190	}
575		1191
576	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
577	flush()	1232	flush ()
578	PROTOTYPE:	1233	PROTOTYPE:
579	CODE:	1234	CODE:
580	while (nreqs)	1235	while (nreqs)
581	{	1236	{
582	poll_wait ();	1237	poll_wait ();
…		…
622	CODE:	1277	CODE:
623	RETVAL = nreqs;	1278	RETVAL = nreqs;
624	OUTPUT:	1279	OUTPUT:
625	RETVAL	1280	RETVAL
626		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	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1293
		1294	void
		1295	add (aio_req grp, ...)
		1296	PPCODE:
		1297	{
		1298	int i;
		1299	aio_req req;
		1300
		1301	if (grp->fd == 2)
		1302	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1303
		1304	for (i = 1; i < items; ++i )
		1305	{
		1306	if (GIMME_V != G_VOID)
		1307	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1308
		1309	req = SvAIO_REQ (ST (i));
		1310
		1311	if (req)
		1312	{
		1313	++grp->length;
		1314	req->grp = grp;
		1315
		1316	req->grp_prev = 0;
		1317	req->grp_next = grp->grp_first;
		1318
		1319	if (grp->grp_first)
		1320	grp->grp_first->grp_prev = req;
		1321
		1322	grp->grp_first = req;
		1323	}
		1324	}
		1325	}
		1326
		1327	void
		1328	result (aio_req grp, ...)
		1329	CODE:
		1330	{
		1331	int i;
		1332	AV *av = newAV ();
		1333
		1334	for (i = 1; i < items; ++i )
		1335	av_push (av, newSVsv (ST (i)));
		1336
		1337	SvREFCNT_dec (grp->data);
		1338	grp->data = (SV *)av;
		1339	}
		1340
		1341	void
		1342	lock (aio_req grp)
		1343	CODE:
		1344	++grp->length;
		1345
		1346	void
		1347	unlock (aio_req grp)
		1348	CODE:
		1349	aio_grp_dec (grp);
		1350
		1351	void
		1352	feeder_limit (aio_req grp, int limit)
		1353	CODE:
		1354	grp->fd2 = limit;
		1355	aio_grp_feed (grp);
		1356
		1357	void
		1358	set_feeder (aio_req grp, SV *callback=&PL_sv_undef)
		1359	CODE:
		1360	{
		1361	SvREFCNT_dec (grp->fh2);
		1362	grp->fh2 = newSVsv (callback);
		1363
		1364	if (grp->fd2 <= 0)
		1365	grp->fd2 = 2;
		1366
		1367	aio_grp_feed (grp);
		1368	}
		1369

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