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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.12 by root, Wed Jul 20 21:57:04 2005 UTC vs.
Revision 1.52 by root, Sun Oct 22 22:14:54 2006 UTC

1	#define _XOPEN_SOURCE 500	1	#define _REENTRANT 1
		2	#include <errno.h>
2		3
3	#include "EXTERN.h"	4	#include "EXTERN.h"
4	#include "perl.h"	5	#include "perl.h"
5	#include "XSUB.h"	6	#include "XSUB.h"
6		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>
7	#include <sys/types.h>	16	#include <sys/types.h>
8	#include <sys/stat.h>	17	#include <sys/stat.h>
9		18	#include <limits.h>
10	#include <unistd.h>	19	#include <unistd.h>
11	#include <fcntl.h>	20	#include <fcntl.h>
12	#include <signal.h>	21	#include <signal.h>
13	#include <sched.h>	22	#include <sched.h>
		23
		24	#if HAVE_SENDFILE
14	#if __linux	25	# if __linux
		26	# include <sys/sendfile.h>
		27	# elif __freebsd
15	#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
16	#endif	37	#endif
17		38
18	#include <pthread.h>	39	/* used for struct dirent, AIX doesn't provide it */
19		40	#ifndef NAME_MAX
20	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	41	# define NAME_MAX 4096
21	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	42	#endif
22	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
23		43
24	#if __ia64	44	#if __ia64
25	# define STACKSIZE 65536	45	# define STACKSIZE 65536
26	#else	46	#else
27	# define STACKSIZE 4096	47	# define STACKSIZE 8192
28	#endif	48	#endif
29		49
30	enum {	50	enum {
31	REQ_QUIT,	51	REQ_QUIT,
32	REQ_OPEN, REQ_CLOSE,	52	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,	53	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		54	REQ_SENDFILE,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35	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,
36	};	62	};
37		63
		64	#define AIO_REQ_KLASS "IO::AIO::REQ"
		65	#define AIO_GRP_KLASS "IO::AIO::GRP"
		66
38	typedef struct aio_cb {	67	typedef struct aio_cb
		68	{
39	struct aio_cb *volatile next;	69	struct aio_cb *volatile next;
40		70
41	int type;	71	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
42		72
43	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;
44	off_t offset;	79	off_t offset;
45	size_t length;	80	size_t length;
46	ssize_t result;	81	ssize_t result;
		82
		83	int type;
		84	int fd, fd2;
		85	int errorno;
		86	STRLEN dataoffset;
47	mode_t mode; /* open */	87	mode_t mode; /* open */
48	int errorno;	88	unsigned char cancelled;
49	SV *data, *callback;
50	void *dataptr;
51	STRLEN dataoffset;
52
53	Stat_t *statdata;
54	} aio_cb;	89	} aio_cb;
55		90
56	typedef aio_cb *aio_req;	91	typedef aio_cb *aio_req;
		92	typedef aio_cb *aio_req_ornot;
57		93
58	static int started;	94	static int started, wanted;
59	static volatile int nreqs;	95	static volatile int nreqs;
60	static int max_outstanding = 1<<30;	96	static int max_outstanding = 1<<30;
61	static int respipe [2];	97	static int respipe [2];
62		98
63	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	99	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
…		…
65	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	101	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
66		102
67	static volatile aio_req reqs, reqe; /* queue start, queue end */	103	static volatile aio_req reqs, reqe; /* queue start, queue end */
68	static volatile aio_req ress, rese; /* queue start, queue end */	104	static volatile aio_req ress, rese; /* queue start, queue end */
69		105
70	static void	106	static void req_invoke (aio_req req);
71	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	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		124	croak ("object of class " AIO_REQ_KLASS " expected");
		125
		126	MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		127
		128	return mg ? (aio_req)mg->mg_ptr : 0;
		129	}
		130
		131	static void aio_grp_feed (aio_req grp)
		132	{
		133	while (grp->length < grp->fd2)
		134	{
		135	int old_len = grp->length;
		136
		137	if (grp->fh2 && SvOK (grp->fh2))
		138	{
		139	dSP;
		140
		141	ENTER;
		142	SAVETMPS;
		143	PUSHMARK (SP);
		144	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		145	PUTBACK;
		146	call_sv (grp->fh2, G_VOID | G_EVAL);
		147	SPAGAIN;
		148	FREETMPS;
		149	LEAVE;
		150	}
		151
		152	/* stop if no progress has been made */
		153	if (old_len == grp->length)
		154	{
		155	SvREFCNT_dec (grp->fh2);
		156	grp->fh2 = 0;
		157	break;
		158	}
		159	}
		160	}
		161
		162	static void aio_grp_dec (aio_req grp)
		163	{
		164	--grp->length;
		165
		166	/* call feeder, if applicable */
		167	aio_grp_feed (grp);
		168
		169	/* finish, if done */
		170	if (!grp->length && grp->fd)
		171	{
		172	req_invoke (grp);
		173	req_free (grp);
		174	}
		175	}
		176
		177	static void poll_wait ()
72	{	178	{
73	if (nreqs && !ress)	179	if (nreqs && !ress)
74	{	180	{
75	fd_set rfd;	181	fd_set rfd;
76	FD_ZERO(&rfd);	182	FD_ZERO(&rfd);
…		…
78		184
79	select (respipe [0] + 1, &rfd, 0, 0, 0);	185	select (respipe [0] + 1, &rfd, 0, 0, 0);
80	}	186	}
81	}	187	}
82		188
83	static int	189	static void req_invoke (aio_req req)
84	poll_cb ()	190	{
		191	dSP;
		192	int errorno = errno;
		193
		194	if (req->cancelled || !SvOK (req->callback))
		195	return;
		196
		197	errno = req->errorno;
		198
		199	ENTER;
		200	SAVETMPS;
		201	PUSHMARK (SP);
		202	EXTEND (SP, 1);
		203
		204	switch (req->type)
		205	{
		206	case REQ_READDIR:
		207	{
		208	SV *rv = &PL_sv_undef;
		209
		210	if (req->result >= 0)
		211	{
		212	char *buf = req->data2ptr;
		213	AV *av = newAV ();
		214
		215	while (req->result)
		216	{
		217	SV *sv = newSVpv (buf, 0);
		218
		219	av_push (av, sv);
		220	buf += SvCUR (sv) + 1;
		221	req->result--;
		222	}
		223
		224	rv = sv_2mortal (newRV_noinc ((SV *)av));
		225	}
		226
		227	PUSHs (rv);
		228	}
		229	break;
		230
		231	case REQ_OPEN:
		232	{
		233	/* convert fd to fh */
		234	SV *fh;
		235
		236	PUSHs (sv_2mortal (newSViv (req->result)));
		237	PUTBACK;
		238	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		239	SPAGAIN;
		240
		241	fh = SvREFCNT_inc (POPs);
		242
		243	PUSHMARK (SP);
		244	XPUSHs (sv_2mortal (fh));
		245	}
		246	break;
		247
		248	case REQ_GROUP:
		249	req->fd = 2; /* mark group as finished */
		250
		251	if (req->data)
		252	{
		253	int i;
		254	AV *av = (AV *)req->data;
		255
		256	EXTEND (SP, AvFILL (av) + 1);
		257	for (i = 0; i <= AvFILL (av); ++i)
		258	PUSHs (*av_fetch (av, i, 0));
		259	}
		260	break;
		261
		262	case REQ_SLEEP:
		263	break;
		264
		265	default:
		266	PUSHs (sv_2mortal (newSViv (req->result)));
		267	break;
		268	}
		269
		270
		271	PUTBACK;
		272	call_sv (req->callback, G_VOID | G_EVAL);
		273	SPAGAIN;
		274
		275	FREETMPS;
		276	LEAVE;
		277
		278	errno = errorno;
		279
		280	if (SvTRUE (ERRSV))
		281	{
		282	req_free (req);
		283	croak (0);
		284	}
		285	}
		286
		287	static void req_free (aio_req req)
		288	{
		289	if (req->grp)
		290	{
		291	aio_req grp = req->grp;
		292
		293	/* unlink request */
		294	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		295	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		296
		297	if (grp->grp_first == req)
		298	grp->grp_first = req->grp_next;
		299
		300	aio_grp_dec (grp);
		301	}
		302
		303	if (req->self)
		304	{
		305	sv_unmagic (req->self, PERL_MAGIC_ext);
		306	SvREFCNT_dec (req->self);
		307	}
		308
		309	SvREFCNT_dec (req->data);
		310	SvREFCNT_dec (req->fh);
		311	SvREFCNT_dec (req->fh2);
		312	SvREFCNT_dec (req->callback);
		313	Safefree (req->statdata);
		314
		315	if (req->type == REQ_READDIR && req->result >= 0)
		316	free (req->data2ptr);
		317
		318	Safefree (req);
		319	}
		320
		321	static void req_cancel (aio_req req)
		322	{
		323	req->cancelled = 1;
		324
		325	if (req->type == REQ_GROUP)
		326	{
		327	aio_req sub;
		328
		329	for (sub = req->grp_first; sub; sub = sub->grp_next)
		330	req_cancel (sub);
		331	}
		332	}
		333
		334	static int poll_cb ()
85	{	335	{
86	dSP;	336	dSP;
87	int count = 0;	337	int count = 0;
		338	int do_croak = 0;
88	aio_req req, prv;	339	aio_req req;
89		340
		341	for (;;)
		342	{
90	pthread_mutex_lock (&reslock);	343	pthread_mutex_lock (&reslock);
		344	req = ress;
91		345
92	{	346	if (req)
		347	{
		348	ress = req->next;
		349
		350	if (!ress)
		351	{
93	/* read any signals sent by the worker threads */	352	/* read any signals sent by the worker threads */
94	char buf [32];	353	char buf [32];
95	while (read (respipe [0], buf, 32) > 0)	354	while (read (respipe [0], buf, 32) == 32)
		355	;
		356
		357	rese = 0;
		358	}
96	;	359	}
97	}
98		360
99	req = ress;
100	ress = rese = 0;
101
102	pthread_mutex_unlock (&reslock);	361	pthread_mutex_unlock (&reslock);
103		362
104	while (req)	363	if (!req)
105	{	364	break;
		365
106	nreqs--;	366	--nreqs;
107		367
108	if (req->type == REQ_QUIT)	368	if (req->type == REQ_QUIT)
109	started--;	369	started--;
		370	else if (req->type == REQ_GROUP && req->length)
		371	{
		372	req->fd = 1; /* mark request as delayed */
		373	continue;
		374	}
110	else	375	else
111	{	376	{
112	int errorno = errno;
113	errno = req->errorno;
114
115	if (req->type == REQ_READ)	377	if (req->type == REQ_READ)
116	SvCUR_set (req->data, req->dataoffset	378	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
117	+ req->result > 0 ? req->result : 0);
118		379
		380	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		381	SvREADONLY_off (req->data);
		382
119	if (req->data)	383	if (req->statdata)
120	SvREFCNT_dec (req->data);
121
122	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
123	{	384	{
124	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	385	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
125	PL_laststatval = req->result;	386	PL_laststatval = req->result;
126	PL_statcache = *(req->statdata);	387	PL_statcache = *(req->statdata);
127
128	Safefree (req->statdata);
129	}	388	}
130		389
131	PUSHMARK (SP);	390	req_invoke (req);
132	XPUSHs (sv_2mortal (newSViv (req->result)));
133		391
134	if (req->type == REQ_OPEN)
135	{
136	/* convert fd to fh */
137	SV *fh;
138
139	PUTBACK;
140	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
141	SPAGAIN;
142
143	fh = POPs;
144
145	PUSHMARK (SP);
146	XPUSHs (fh);
147	}
148
149	if (SvOK (req->callback))
150	{
151	PUTBACK;
152	call_sv (req->callback, G_VOID | G_EVAL);
153	SPAGAIN;
154	}
155
156	if (req->callback)
157	SvREFCNT_dec (req->callback);
158
159	errno = errorno;
160	count++;	392	count++;
161	}	393	}
162		394
163	prv = req;
164	req = req->next;
165	Safefree (prv);	395	req_free (req);
166
167	/* TODO: croak on errors? */
168	}	396	}
169		397
170	return count;	398	return count;
171	}	399	}
172		400
173	static void *aio_proc(void *arg);	401	static void *aio_proc(void *arg);
174		402
175	static void
176	start_thread (void)	403	static void start_thread (void)
177	{	404	{
178	sigset_t fullsigset, oldsigset;	405	sigset_t fullsigset, oldsigset;
179	pthread_t tid;	406	pthread_t tid;
180	pthread_attr_t attr;	407	pthread_attr_t attr;
181		408
…		…
190	started++;	417	started++;
191		418
192	sigprocmask (SIG_SETMASK, &oldsigset, 0);	419	sigprocmask (SIG_SETMASK, &oldsigset, 0);
193	}	420	}
194		421
195	static void	422	static void req_send (aio_req req)
196	send_req (aio_req req)
197	{	423	{
		424	while (started < wanted && nreqs >= started)
		425	start_thread ();
		426
198	nreqs++;	427	++nreqs;
199		428
200	pthread_mutex_lock (&reqlock);	429	pthread_mutex_lock (&reqlock);
201		430
202	req->next = 0;	431	req->next = 0;
203		432
…		…
210	reqe = reqs = req;	439	reqe = reqs = req;
211		440
212	pthread_cond_signal (&reqwait);	441	pthread_cond_signal (&reqwait);
213	pthread_mutex_unlock (&reqlock);	442	pthread_mutex_unlock (&reqlock);
214		443
215	while (nreqs > max_outstanding)	444	if (nreqs > max_outstanding)
		445	for (;;)
		446	{
		447	poll_cb ();
		448
		449	if (nreqs <= max_outstanding)
		450	break;
		451
		452	poll_wait ();
		453	}
		454	}
		455
		456	static void end_thread (void)
		457	{
		458	aio_req req;
		459	Newz (0, req, 1, aio_cb);
		460	req->type = REQ_QUIT;
		461
		462	req_send (req);
		463	}
		464
		465	static void min_parallel (int nthreads)
		466	{
		467	if (wanted < nthreads)
		468	wanted = nthreads;
		469	}
		470
		471	static void max_parallel (int nthreads)
		472	{
		473	int cur = started;
		474
		475	if (wanted > nthreads)
		476	wanted = nthreads;
		477
		478	while (cur > wanted)
		479	{
		480	end_thread ();
		481	cur--;
		482	}
		483
		484	while (started > wanted)
216	{	485	{
217	poll_wait ();	486	poll_wait ();
218	poll_cb ();	487	poll_cb ();
219	}	488	}
220	}	489	}
221		490
222	static void	491	static void create_pipe ()
223	end_thread (void)
224	{	492	{
225	aio_req req;	493	if (pipe (respipe))
226	New (0, req, 1, aio_cb);	494	croak ("unable to initialize result pipe");
227	req->type = REQ_QUIT;
228		495
229	send_req (req);	496	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
230	}	497	croak ("cannot set result pipe to nonblocking mode");
231		498
232	static void	499	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
233	read_write (int dowrite, int fd, off_t offset, size_t length,	500	croak ("cannot set result pipe to nonblocking mode");
234	SV *data, STRLEN dataoffset, SV *callback)	501	}
235	{
236	aio_req req;
237	STRLEN svlen;
238	char *svptr = SvPV (data, svlen);
239		502
240	SvUPGRADE (data, SVt_PV);	503	/*****************************************************************************/
241	SvPOK_on (data);	504	/* work around various missing functions */
242		505
243	if (dataoffset < 0)	506	#if !HAVE_PREADWRITE
		507	# define pread aio_pread
		508	# define pwrite aio_pwrite
		509
		510	/*
		511	* make our pread/pwrite safe against themselves, but not against
		512	* normal read/write by using a mutex. slows down execution a lot,
		513	* but that's your problem, not mine.
		514	*/
		515	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
		516
		517	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		518	{
		519	ssize_t res;
		520	off_t ooffset;
		521
		522	pthread_mutex_lock (&preadwritelock);
		523	ooffset = lseek (fd, 0, SEEK_CUR);
		524	lseek (fd, offset, SEEK_SET);
		525	res = read (fd, buf, count);
		526	lseek (fd, ooffset, SEEK_SET);
		527	pthread_mutex_unlock (&preadwritelock);
		528
		529	return res;
		530	}
		531
		532	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		533	{
		534	ssize_t res;
		535	off_t ooffset;
		536
		537	pthread_mutex_lock (&preadwritelock);
		538	ooffset = lseek (fd, 0, SEEK_CUR);
		539	lseek (fd, offset, SEEK_SET);
		540	res = write (fd, buf, count);
		541	lseek (fd, offset, SEEK_SET);
		542	pthread_mutex_unlock (&preadwritelock);
		543
		544	return res;
		545	}
		546	#endif
		547
		548	#if !HAVE_FDATASYNC
		549	# define fdatasync fsync
		550	#endif
		551
		552	#if !HAVE_READAHEAD
		553	# define readahead aio_readahead
		554
		555	static ssize_t readahead (int fd, off_t offset, size_t count)
		556	{
		557	char readahead_buf[4096];
		558
		559	while (count > 0)
		560	{
		561	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
		562
		563	pread (fd, readahead_buf, len, offset);
244	dataoffset += svlen;	564	offset += len;
245		565	count -= len;
246	if (dataoffset < 0 || dataoffset > svlen)
247	croak ("data offset outside of string");
248
249	if (dowrite)
250	{	566	}
251	/* write: check length and adjust. */	567
252	if (length < 0 || length + dataoffset > svlen)	568	errno = 0;
253	length = svlen - dataoffset;	569	}
		570	#endif
		571
		572	#if !HAVE_READDIR_R
		573	# define readdir_r aio_readdir_r
		574
		575	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		576
		577	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		578	{
		579	struct dirent *e;
		580	int errorno;
		581
		582	pthread_mutex_lock (&readdirlock);
		583
		584	e = readdir (dirp);
		585	errorno = errno;
		586
		587	if (e)
		588	{
		589	*res = ent;
		590	strcpy (ent->d_name, e->d_name);
254	}	591	}
255	else	592	else
		593	*res = 0;
		594
		595	pthread_mutex_unlock (&readdirlock);
		596
		597	errno = errorno;
		598	return e ? 0 : -1;
		599	}
		600	#endif
		601
		602	/* sendfile always needs emulation */
		603	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
		604	{
		605	ssize_t res;
		606
		607	if (!count)
		608	return 0;
		609
		610	#if HAVE_SENDFILE
		611	# if __linux
		612	res = sendfile (ofd, ifd, &offset, count);
		613
		614	# elif __freebsd
		615	/*
		616	* Of course, the freebsd sendfile is a dire hack with no thoughts
		617	* wasted on making it similar to other I/O functions.
		618	*/
256	{	619	{
257	/* read: grow scalar as necessary */	620	off_t sbytes;
258	svptr = SvGROW (data, length + dataoffset);	621	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		622
		623	if (res < 0 && sbytes)
		624	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
		625	res = sbytes;
		626	}
		627
		628	# elif __hpux
		629	res = sendfile (ofd, ifd, offset, count, 0, 0);
		630
		631	# elif __solaris
		632	{
		633	struct sendfilevec vec;
		634	size_t sbytes;
		635
		636	vec.sfv_fd = ifd;
		637	vec.sfv_flag = 0;
		638	vec.sfv_off = offset;
		639	vec.sfv_len = count;
		640
		641	res = sendfilev (ofd, &vec, 1, &sbytes);
		642
		643	if (res < 0 && sbytes)
		644	res = sbytes;
		645	}
		646
		647	# endif
		648	#else
		649	res = -1;
		650	errno = ENOSYS;
		651	#endif
		652
		653	if (res < 0
		654	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		655	#if __solaris
		656	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		657	#endif
		658	)
		659	)
259	}	660	{
		661	/* emulate sendfile. this is a major pain in the ass */
		662	char buf[4096];
		663	res = 0;
260		664
261	if (length < 0)	665	while (count)
262	croak ("length must not be negative");	666	{
		667	ssize_t cnt;
		668
		669	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
263		670
264	Newz (0, req, 1, aio_cb);	671	if (cnt <= 0)
		672	{
		673	if (cnt && !res) res = -1;
		674	break;
		675	}
265		676
		677	cnt = write (ofd, buf, cnt);
		678
		679	if (cnt <= 0)
		680	{
		681	if (cnt && !res) res = -1;
		682	break;
		683	}
		684
		685	offset += cnt;
		686	res += cnt;
		687	count -= cnt;
		688	}
		689	}
		690
		691	return res;
		692	}
		693
		694	/* read a full directory */
		695	static int scandir_ (const char *path, void **namesp)
		696	{
		697	DIR *dirp = opendir (path);
		698	union
		699	{
		700	struct dirent d;
		701	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		702	} u;
		703	struct dirent *entp;
		704	char *name, *names;
		705	int memlen = 4096;
		706	int memofs = 0;
		707	int res = 0;
		708	int errorno;
		709
266	if (!req)	710	if (!dirp)
267	croak ("out of memory during aio_req allocation");	711	return -1;
268		712
269	req->type = dowrite ? REQ_WRITE : REQ_READ;	713	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		714
277	send_req (req);	715	for (;;)
278	}	716	{
		717	errno = 0, readdir_r (dirp, &u.d, &entp);
279		718
280	static void *	719	if (!entp)
		720	break;
		721
		722	name = entp->d_name;
		723
		724	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		725	{
		726	int len = strlen (name) + 1;
		727
		728	res++;
		729
		730	while (memofs + len > memlen)
		731	{
		732	memlen *= 2;
		733	names = realloc (names, memlen);
		734	if (!names)
		735	break;
		736	}
		737
		738	memcpy (names + memofs, name, len);
		739	memofs += len;
		740	}
		741	}
		742
		743	errorno = errno;
		744	closedir (dirp);
		745
		746	if (errorno)
		747	{
		748	free (names);
		749	errno = errorno;
		750	res = -1;
		751	}
		752
		753	*namesp = (void *)names;
		754	return res;
		755	}
		756
		757	/*****************************************************************************/
		758
281	aio_proc (void *thr_arg)	759	static void *aio_proc (void *thr_arg)
282	{	760	{
283	aio_req req;	761	aio_req req;
284	int type;	762	int type;
285		763
286	do	764	do
…		…
305		783
306	pthread_mutex_unlock (&reqlock);	784	pthread_mutex_unlock (&reqlock);
307		785
308	errno = 0; /* strictly unnecessary */	786	errno = 0; /* strictly unnecessary */
309		787
310	type = req->type;	788	if (!req->cancelled)
311		789	switch (type = req->type) /* remember type for QUIT check */
312	switch (type)
313	{	790	{
314	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	791	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
315	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	792	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
316	#if SYS_readahead	793
317	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	794	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
318	#else	795	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		796
322	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	797	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
323	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	798	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
324	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	799	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
325		800
326	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	801	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
327	case REQ_CLOSE: req->result = close (req->fd); break;	802	case REQ_CLOSE: req->result = close (req->fd); break;
328	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	803	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
329
330	case REQ_FSYNC: req->result = fsync (req->fd); break;	804	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		805	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		806	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
		807	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
		808
331	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	809	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
		810	case REQ_FSYNC: req->result = fsync (req->fd); break;
		811	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
332		812
		813	case REQ_SLEEP:
		814	{
		815	struct timeval tv;
		816
		817	tv.tv_sec = req->fd;
		818	tv.tv_usec = req->fd2;
		819
		820	req->result = select (0, 0, 0, 0, &tv);
		821	}
		822
333	case REQ_QUIT:	823	case REQ_QUIT:
334	break;	824	break;
335		825
336	default:	826	default:
337	req->result = ENOSYS;	827	req->result = ENOSYS;
338	break;	828	break;
339	}	829	}
340		830
341	req->errorno = errno;	831	req->errorno = errno;
342		832
343	pthread_mutex_lock (&reslock);	833	pthread_mutex_lock (&reslock);
344		834
…		…
362	while (type != REQ_QUIT);	852	while (type != REQ_QUIT);
363		853
364	return 0;	854	return 0;
365	}	855	}
366		856
		857	/*****************************************************************************/
		858
		859	static void atfork_prepare (void)
		860	{
		861	pthread_mutex_lock (&reqlock);
		862	pthread_mutex_lock (&reslock);
		863	#if !HAVE_PREADWRITE
		864	pthread_mutex_lock (&preadwritelock);
		865	#endif
		866	#if !HAVE_READDIR_R
		867	pthread_mutex_lock (&readdirlock);
		868	#endif
		869	}
		870
		871	static void atfork_parent (void)
		872	{
		873	#if !HAVE_READDIR_R
		874	pthread_mutex_unlock (&readdirlock);
		875	#endif
		876	#if !HAVE_PREADWRITE
		877	pthread_mutex_unlock (&preadwritelock);
		878	#endif
		879	pthread_mutex_unlock (&reslock);
		880	pthread_mutex_unlock (&reqlock);
		881	}
		882
		883	static void atfork_child (void)
		884	{
		885	aio_req prv;
		886
		887	started = 0;
		888
		889	while (reqs)
		890	{
		891	prv = reqs;
		892	reqs = prv->next;
		893	req_free (prv);
		894	}
		895
		896	reqs = reqe = 0;
		897
		898	while (ress)
		899	{
		900	prv = ress;
		901	ress = prv->next;
		902	req_free (prv);
		903	}
		904
		905	ress = rese = 0;
		906
		907	close (respipe [0]);
		908	close (respipe [1]);
		909	create_pipe ();
		910
		911	atfork_parent ();
		912	}
		913
		914	#define dREQ \
		915	aio_req req; \
		916	\
		917	if (SvOK (callback) && !SvROK (callback)) \
		918	croak ("callback must be undef or of reference type"); \
		919	\
		920	Newz (0, req, 1, aio_cb); \
		921	if (!req) \
		922	croak ("out of memory during aio_req allocation"); \
		923	\
		924	req->callback = newSVsv (callback)
		925
		926	#define REQ_SEND \
		927	req_send (req); \
		928	\
		929	if (GIMME_V != G_VOID) \
		930	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		931
367	MODULE = IO::AIO PACKAGE = IO::AIO	932	MODULE = IO::AIO PACKAGE = IO::AIO
368		933
369	PROTOTYPES: ENABLE	934	PROTOTYPES: ENABLE
370		935
371	BOOT:	936	BOOT:
372	{	937	{
373	if (pipe (respipe))	938	HV *stash = gv_stashpv ("IO::AIO", 1);
374	croak ("unable to initialize result pipe");	939	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		940	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		941	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
375		942
376	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	943	create_pipe ();
377	croak ("cannot set result pipe to nonblocking mode");	944	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	}	945	}
382		946
383	void	947	void
384	min_parallel(nthreads)	948	min_parallel (nthreads)
385	int nthreads	949	int nthreads
386	PROTOTYPE: $	950	PROTOTYPE: $
387	CODE:
388	while (nthreads > started)
389	start_thread ();
390		951
391	void	952	void
392	max_parallel(nthreads)	953	max_parallel (nthreads)
393	int nthreads	954	int nthreads
394	PROTOTYPE: $	955	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		956
411	int	957	int
412	max_outstanding(nreqs)	958	max_outstanding (nreqs)
413	int nreqs	959	int nreqs
414	PROTOTYPE: $	960	PROTOTYPE: $
415	CODE:	961	CODE:
416	RETVAL = max_outstanding;	962	RETVAL = max_outstanding;
417	max_outstanding = nreqs;	963	max_outstanding = nreqs;
418		964
419	void	965	void
420	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	966	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
421	SV * pathname	967	SV * pathname
422	int flags	968	int flags
423	int mode	969	int mode
424	SV * callback	970	SV * callback
425	PROTOTYPE: $$$;$	971	PROTOTYPE: $$$;$
426	CODE:	972	PPCODE:
427	{	973	{
428	aio_req req;	974	dREQ;
429
430	Newz (0, req, 1, aio_cb);
431
432	if (!req)
433	croak ("out of memory during aio_req allocation");
434		975
435	req->type = REQ_OPEN;	976	req->type = REQ_OPEN;
436	req->data = newSVsv (pathname);	977	req->data = newSVsv (pathname);
437	req->dataptr = SvPV_nolen (req->data);	978	req->dataptr = SvPVbyte_nolen (req->data);
438	req->fd = flags;	979	req->fd = flags;
439	req->mode = mode;	980	req->mode = mode;
440	req->callback = SvREFCNT_inc (callback);
441		981
442	send_req (req);	982	REQ_SEND;
443	}	983	}
444		984
445	void	985	void
446	aio_close(fh,callback=&PL_sv_undef)	986	aio_close (fh,callback=&PL_sv_undef)
447	InputStream fh	987	SV * fh
448	SV * callback	988	SV * callback
449	PROTOTYPE: $;$	989	PROTOTYPE: $;$
450	ALIAS:	990	ALIAS:
451	aio_close = REQ_CLOSE	991	aio_close = REQ_CLOSE
452	aio_fsync = REQ_FSYNC	992	aio_fsync = REQ_FSYNC
453	aio_fdatasync = REQ_FDATASYNC	993	aio_fdatasync = REQ_FDATASYNC
454	CODE:	994	PPCODE:
		995	{
		996	dREQ;
		997
		998	req->type = ix;
		999	req->fh = newSVsv (fh);
		1000	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
		1001
		1002	REQ_SEND (req);
		1003	}
		1004
		1005	void
		1006	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
		1007	SV * fh
		1008	UV offset
		1009	UV length
		1010	SV * data
		1011	UV dataoffset
		1012	SV * callback
		1013	ALIAS:
		1014	aio_read = REQ_READ
		1015	aio_write = REQ_WRITE
		1016	PROTOTYPE: $$$$$;$
		1017	PPCODE:
455	{	1018	{
456	aio_req req;	1019	aio_req req;
		1020	STRLEN svlen;
		1021	char *svptr = SvPVbyte (data, svlen);
457		1022
458	Newz (0, req, 1, aio_cb);	1023	SvUPGRADE (data, SVt_PV);
		1024	SvPOK_on (data);
459		1025
460	if (!req)	1026	if (dataoffset < 0)
461	croak ("out of memory during aio_req allocation");	1027	dataoffset += svlen;
462		1028
463	req->type = ix;	1029	if (dataoffset < 0 || dataoffset > svlen)
464	req->fd = PerlIO_fileno (fh);	1030	croak ("data offset outside of string");
465	req->callback = SvREFCNT_inc (callback);
466		1031
467	send_req (req);	1032	if (ix == REQ_WRITE)
468	}	1033	{
469		1034	/* write: check length and adjust. */
470	void	1035	if (length < 0 || length + dataoffset > svlen)
471	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1036	length = svlen - dataoffset;
472	InputStream fh	1037	}
473	UV offset	1038	else
474	IV length	1039	{
475	SV * data	1040	/* read: grow scalar as necessary */
476	IV dataoffset	1041	svptr = SvGROW (data, length + dataoffset);
477	SV * callback	1042	}
478	PROTOTYPE: $$$$$;$
479	CODE:
480	read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
481
482	void
483	aio_write(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
484	OutputStream fh
485	UV offset
486	IV length
487	SV * data
488	IV dataoffset
489	SV * callback
490	PROTOTYPE: $$$$$;$
491	CODE:
492	read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
493
494	void
495	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
496	InputStream fh
497	UV offset
498	IV length
499	SV * callback
500	PROTOTYPE: $$$;$
501	CODE:
502	{
503	aio_req req;
504		1043
505	if (length < 0)	1044	if (length < 0)
506	croak ("length must not be negative");	1045	croak ("length must not be negative");
507		1046
508	Newz (0, req, 1, aio_cb);	1047	{
		1048	dREQ;
509		1049
510	if (!req)	1050	req->type = ix;
511	croak ("out of memory during aio_req allocation");	1051	req->fh = newSVsv (fh);
		1052	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
		1053	: IoOFP (sv_2io (fh)));
		1054	req->offset = offset;
		1055	req->length = length;
		1056	req->data = SvREFCNT_inc (data);
		1057	req->dataptr = (char *)svptr + dataoffset;
		1058
		1059	if (!SvREADONLY (data))
		1060	{
		1061	SvREADONLY_on (data);
		1062	req->data2ptr = (void *)data;
		1063	}
		1064
		1065	REQ_SEND;
		1066	}
		1067	}
		1068
		1069	void
		1070	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1071	SV * out_fh
		1072	SV * in_fh
		1073	UV in_offset
		1074	UV length
		1075	SV * callback
		1076	PROTOTYPE: $$$$;$
		1077	PPCODE:
		1078	{
		1079	dREQ;
		1080
		1081	req->type = REQ_SENDFILE;
		1082	req->fh = newSVsv (out_fh);
		1083	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1084	req->fh2 = newSVsv (in_fh);
		1085	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1086	req->offset = in_offset;
		1087	req->length = length;
		1088
		1089	REQ_SEND;
		1090	}
		1091
		1092	void
		1093	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
		1094	SV * fh
		1095	UV offset
		1096	IV length
		1097	SV * callback
		1098	PROTOTYPE: $$$;$
		1099	PPCODE:
		1100	{
		1101	dREQ;
512		1102
513	req->type = REQ_READAHEAD;	1103	req->type = REQ_READAHEAD;
		1104	req->fh = newSVsv (fh);
514	req->fd = PerlIO_fileno (fh);	1105	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
515	req->offset = offset;	1106	req->offset = offset;
516	req->length = length;	1107	req->length = length;
517	req->callback = SvREFCNT_inc (callback);
518		1108
519	send_req (req);	1109	REQ_SEND;
520	}	1110	}
521		1111
522	void	1112	void
523	aio_stat(fh_or_path,callback=&PL_sv_undef)	1113	aio_stat (fh_or_path,callback=&PL_sv_undef)
524	SV * fh_or_path	1114	SV * fh_or_path
525	SV * callback	1115	SV * callback
526	ALIAS:	1116	ALIAS:
527	aio_stat = REQ_STAT	1117	aio_stat = REQ_STAT
528	aio_lstat = REQ_LSTAT	1118	aio_lstat = REQ_LSTAT
529	CODE:	1119	PPCODE:
530	{	1120	{
531	aio_req req;	1121	dREQ;
532
533	Newz (0, req, 1, aio_cb);
534
535	if (!req)
536	croak ("out of memory during aio_req allocation");
537		1122
538	New (0, req->statdata, 1, Stat_t);	1123	New (0, req->statdata, 1, Stat_t);
539
540	if (!req->statdata)	1124	if (!req->statdata)
		1125	{
		1126	req_free (req);
541	croak ("out of memory during aio_req->statdata allocation");	1127	croak ("out of memory during aio_req->statdata allocation");
		1128	}
542		1129
543	if (SvPOK (fh_or_path))	1130	if (SvPOK (fh_or_path))
544	{	1131	{
545	req->type = ix;	1132	req->type = ix;
546	req->data = newSVsv (fh_or_path);	1133	req->data = newSVsv (fh_or_path);
547	req->dataptr = SvPV_nolen (req->data);	1134	req->dataptr = SvPVbyte_nolen (req->data);
548	}	1135	}
549	else	1136	else
550	{	1137	{
551	req->type = REQ_FSTAT;	1138	req->type = REQ_FSTAT;
		1139	req->fh = newSVsv (fh_or_path);
552	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1140	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
553	}	1141	}
554		1142
555	req->callback = SvREFCNT_inc (callback);	1143	REQ_SEND;
556
557	send_req (req);
558	}	1144	}
559		1145
560	void	1146	void
561	aio_unlink(pathname,callback=&PL_sv_undef)	1147	aio_unlink (pathname,callback=&PL_sv_undef)
562	SV * pathname	1148	SV * pathname
563	SV * callback	1149	SV * callback
		1150	ALIAS:
		1151	aio_unlink = REQ_UNLINK
		1152	aio_rmdir = REQ_RMDIR
		1153	aio_readdir = REQ_READDIR
564	CODE:	1154	PPCODE:
565	{	1155	{
566	aio_req req;	1156	dREQ;
567		1157
568	Newz (0, req, 1, aio_cb);	1158	req->type = ix;
		1159	req->data = newSVsv (pathname);
		1160	req->dataptr = SvPVbyte_nolen (req->data);
569		1161
570	if (!req)	1162	REQ_SEND;
571	croak ("out of memory during aio_req allocation");	1163	}
		1164
		1165	void
		1166	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1167	SV * oldpath
		1168	SV * newpath
		1169	SV * callback
		1170	ALIAS:
		1171	aio_link = REQ_LINK
		1172	aio_symlink = REQ_SYMLINK
		1173	aio_rename = REQ_RENAME
		1174	PPCODE:
		1175	{
		1176	dREQ;
572		1177
573	req->type = REQ_UNLINK;	1178	req->type = ix;
		1179	req->fh = newSVsv (oldpath);
		1180	req->data2ptr = SvPVbyte_nolen (req->fh);
574	req->data = newSVsv (pathname);	1181	req->data = newSVsv (newpath);
575	req->dataptr = SvPV_nolen (req->data);	1182	req->dataptr = SvPVbyte_nolen (req->data);
576	req->callback = SvREFCNT_inc (callback);
577		1183
578	send_req (req);	1184	REQ_SEND;
579	}	1185	}
580		1186
581	void	1187	void
		1188	aio_sleep (delay,callback=&PL_sv_undef)
		1189	double delay
		1190	SV * callback
		1191	PPCODE:
		1192	{
		1193	dREQ;
		1194
		1195	req->type = REQ_SLEEP;
		1196	req->fd = delay < 0. ? 0 : delay;
		1197	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1198
		1199	REQ_SEND;
		1200	}
		1201
		1202	void
		1203	aio_group (callback=&PL_sv_undef)
		1204	SV * callback
		1205	PROTOTYPE: ;$
		1206	PPCODE:
		1207	{
		1208	dREQ;
		1209	req->type = REQ_GROUP;
		1210	req_send (req);
		1211	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1212	}
		1213
		1214	void
582	flush()	1215	flush ()
583	PROTOTYPE:	1216	PROTOTYPE:
584	CODE:	1217	CODE:
585	while (nreqs)	1218	while (nreqs)
586	{	1219	{
587	poll_wait ();	1220	poll_wait ();
…		…
627	CODE:	1260	CODE:
628	RETVAL = nreqs;	1261	RETVAL = nreqs;
629	OUTPUT:	1262	OUTPUT:
630	RETVAL	1263	RETVAL
631		1264
		1265	PROTOTYPES: DISABLE
		1266
		1267	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1268
		1269	void
		1270	cancel (aio_req_ornot req)
		1271	PROTOTYPE:
		1272	CODE:
		1273	req_cancel (req);
		1274
		1275	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1276
		1277	void
		1278	add (aio_req grp, ...)
		1279	PPCODE:
		1280	{
		1281	int i;
		1282
		1283	if (grp->fd == 2)
		1284	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1285
		1286	for (i = 1; i < items; ++i )
		1287	{
		1288	if (GIMME_V != G_VOID)
		1289	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1290
		1291	aio_req req = SvAIO_REQ (ST (i));
		1292
		1293	if (req)
		1294	{
		1295	++grp->length;
		1296	req->grp = grp;
		1297
		1298	req->grp_prev = 0;
		1299	req->grp_next = grp->grp_first;
		1300
		1301	if (grp->grp_first)
		1302	grp->grp_first->grp_prev = req;
		1303
		1304	grp->grp_first = req;
		1305	}
		1306	}
		1307	}
		1308
		1309	void
		1310	result (aio_req grp, ...)
		1311	CODE:
		1312	{
		1313	int i;
		1314	AV *av = newAV ();
		1315
		1316	for (i = 1; i < items; ++i )
		1317	av_push (av, newSVsv (ST (i)));
		1318
		1319	SvREFCNT_dec (grp->data);
		1320	grp->data = (SV *)av;
		1321	}
		1322
		1323	void
		1324	lock (aio_req grp)
		1325	CODE:
		1326	++grp->length;
		1327
		1328	void
		1329	unlock (aio_req grp)
		1330	CODE:
		1331	aio_grp_dec (grp);
		1332
		1333	void
		1334	feeder_limit (aio_req grp, int limit)
		1335	CODE:
		1336	grp->fd2 = limit;
		1337	aio_grp_feed (grp);
		1338
		1339	void
		1340	set_feeder (aio_req grp, SV *callback=&PL_sv_undef)
		1341	CODE:
		1342	{
		1343	SvREFCNT_dec (grp->fh2);
		1344	grp->fh2 = newSVsv (callback);
		1345
		1346	if (grp->fd2 <= 0)
		1347	grp->fd2 = 2;
		1348
		1349	aio_grp_feed (grp);
		1350	}
		1351

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