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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.11 by root, Wed Jul 20 21:55:27 2005 UTC vs.
Revision 1.124 by root, Thu May 29 03:20:40 2008 UTC

1	#define _XOPEN_SOURCE 500	1	#include "libeio/xthread.h"
		2
		3	#include <errno.h>
2		4
3	#include "EXTERN.h"	5	#include "EXTERN.h"
4	#include "perl.h"	6	#include "perl.h"
5	#include "XSUB.h"	7	#include "XSUB.h"
6		8
		9	#include <stddef.h>
		10	#include <stdlib.h>
		11	#include <errno.h>
7	#include <sys/types.h>	12	#include <sys/types.h>
8	#include <sys/stat.h>	13	#include <sys/stat.h>
9
10	#include <unistd.h>	14	#include <limits.h>
11	#include <fcntl.h>	15	#include <fcntl.h>
12	#include <signal.h>
13	#include <sched.h>	16	#include <sched.h>
14	#if __linux	17
		18	/* perl namespace pollution */
		19	#undef VERSION
		20
		21	#ifdef _WIN32
		22
		23	# define EIO_STRUCT_DIRENT Direntry_t
		24	# undef malloc
		25	# undef free
		26
		27	// perl overrides all those nice win32 functions
		28	# undef open
		29	# undef read
		30	# undef write
		31	# undef send
		32	# undef recv
		33	# undef stat
		34	# undef fstat
		35	# define lstat stat
		36	# undef truncate
		37	# undef ftruncate
		38	# undef open
		39	# undef close
		40	# undef unlink
		41	# undef rmdir
		42	# undef rename
		43	# undef lseek
		44
		45	# define chown(a,b,c) (errno = ENOSYS, -1)
		46	# define fchown(a,b,c) (errno = ENOSYS, -1)
		47	# define fchmod(a,b) (errno = ENOSYS, -1)
		48	# define symlink(a,b) (errno = ENOSYS, -1)
		49	# define readlink(a,b,c) (errno = ENOSYS, -1)
		50	# define mknod(a,b,c) (errno = ENOSYS, -1)
		51	# define truncate(a,b) (errno = ENOSYS, -1)
		52	# define ftruncate(fd,o) chsize ((fd), (o))
		53	# define fsync(fd) _commit (fd)
		54	# define opendir(fd) (errno = ENOSYS, 0)
		55	# define readdir(fd) (errno = ENOSYS, -1)
		56	# define closedir(fd) (errno = ENOSYS, -1)
		57	# define mkdir(a,b) mkdir (a)
		58
		59	#else
		60
		61	# include <sys/time.h>
15	#include <sys/syscall.h>	62	# include <sys/select.h>
		63	# include <unistd.h>
		64	# include <utime.h>
		65	# include <signal.h>
		66	# define EIO_STRUCT_DIRENT struct dirent
		67
16	#endif	68	#endif
17		69
18	#include <pthread.h>	70	#define EIO_STRUCT_STAT Stat_t
19		71
20	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	72	/* use NV for 32 bit perls as it allows larger offsets */
21	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	73	#if IVSIZE >= 8
22	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	74	# define SvVAL64 SvIV
23
24	#if __ia64
25	# define STACKSIZE 65536
26	#else	75	#else
27	# define STACKSIZE 4096	76	# define SvVAL64 SvNV
28	#endif	77	#endif
29		78
		79	static HV *stash;
		80	typedef SV SV8; /* byte-sv, used for argument-checking */
		81
		82	#define AIO_REQ_KLASS "IO::AIO::REQ"
		83	#define AIO_GRP_KLASS "IO::AIO::GRP"
		84
		85	#define EIO_REQ_MEMBERS \
		86	SV *callback; \
		87	SV *sv1, *sv2; \
		88	STRLEN stroffset; \
		89	SV *self;
		90
		91	#define EIO_NO_WRAPPERS 1
		92
		93	#include "libeio/eio.h"
		94
		95	static int req_invoke (eio_req *req);
		96	#define EIO_FINISH(req) req_invoke (req)
		97	static void aio_grp_feed (eio_req *grp);
		98	#define EIO_FEED(req) aio_grp_feed (req)
		99	static void req_destroy (eio_req *grp);
		100	#define EIO_DESTROY(req) req_destroy (req)
		101
30	enum {	102	enum {
31	REQ_QUIT,	103	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
32	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,
35	REQ_FSYNC, REQ_FDATASYNC,
36	};	104	};
37		105
38	typedef struct aio_cb {	106	#include "libeio/eio.c"
39	struct aio_cb *volatile next;
40		107
41	int type;
42
43	int fd;
44	off_t offset;
45	size_t length;
46	ssize_t result;
47	mode_t mode; /* open */
48	int errorno;
49	SV *data, *callback;
50	void *dataptr;
51	STRLEN dataoffset;
52
53	Stat_t *statdata;
54	} aio_cb;
55
56	typedef aio_cb *aio_req;	108	typedef eio_req *aio_req;
		109	typedef eio_req *aio_req_ornot;
57		110
58	static int started;	111	static SV *on_next_submit;
59	static volatile int nreqs;	112	static int next_pri = EIO_PRI_DEFAULT;
60	static int max_outstanding = 1<<30;	113	static int max_outstanding;
61	static int respipe [2];
62		114
63	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	115	static int respipe_osf [2], respipe [2] = { -1, -1 };
64	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
65	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
66		116
67	static volatile aio_req reqs, reqe; /* queue start, queue end */	117	static void req_destroy (aio_req req);
68	static volatile aio_req ress, rese; /* queue start, queue end */	118	static void req_cancel (aio_req req);
69		119
70	static void	120	static void want_poll (void)
71	poll_wait ()
72	{	121	{
73	if (nreqs && !ress)	122	/* write a dummy byte to the pipe so fh becomes ready */
		123	respipe_write (respipe_osf [1], (const void *)&respipe_osf, 1);
		124	}
		125
		126	static void done_poll (void)
		127	{
		128	/* read any signals sent by the worker threads */
		129	char buf [4];
		130	while (respipe_read (respipe [0], buf, 4) == 4)
		131	;
		132	}
		133
		134	/* must be called at most once */
		135	static SV *req_sv (aio_req req, const char *klass)
		136	{
		137	if (!req->self)
74	{	138	{
75	fd_set rfd;	139	req->self = (SV *)newHV ();
76	FD_ZERO(&rfd);	140	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
77	FD_SET(respipe [0], &rfd);
78
79	select (respipe [0] + 1, &rfd, 0, 0, 0);
80	}	141	}
81	}
82		142
83	static int	143	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
84	poll_cb ()	144	}
		145
		146	static aio_req SvAIO_REQ (SV *sv)
		147	{
		148	MAGIC *mg;
		149
		150	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		151	croak ("object of class " AIO_REQ_KLASS " expected");
		152
		153	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		154
		155	return mg ? (aio_req)mg->mg_ptr : 0;
		156	}
		157
		158	static void aio_grp_feed (aio_req grp)
		159	{
		160	if (grp->sv2 && SvOK (grp->sv2))
		161	{
		162	dSP;
		163
		164	ENTER;
		165	SAVETMPS;
		166	PUSHMARK (SP);
		167	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		168	PUTBACK;
		169	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		170	SPAGAIN;
		171	FREETMPS;
		172	LEAVE;
		173	}
		174	}
		175
		176	static void req_submit (eio_req *req)
		177	{
		178	eio_submit (req);
		179
		180	if (on_next_submit)
		181	{
		182	dSP;
		183	SV *cb = sv_2mortal (on_next_submit);
		184
		185	on_next_submit = 0;
		186
		187	PUSHMARK (SP);
		188	PUTBACK;
		189	call_sv (cb, G_DISCARD | G_EVAL);
		190	}
		191	}
		192
		193	static int req_invoke (eio_req *req)
85	{	194	{
86	dSP;	195	dSP;
87	int count = 0;
88	aio_req req, prv;
89		196
90	static int rl;//D	197	if (req->flags & FLAG_SV2_RO_OFF)
91	//printf ("%d ENTER\n", ++rl);//D	198	SvREADONLY_off (req->sv2);
92		199
93	pthread_mutex_lock (&reslock);	200	if (!EIO_CANCELLED (req) && SvOK (req->callback))
94
95	{
96	/* read any signals sent by the worker threads */
97	char buf [32];
98	while (read (respipe [0], buf, 32) > 0)
99	;
100	}
101
102	req = ress;
103	ress = rese = 0;
104
105	pthread_mutex_unlock (&reslock);
106
107	while (req)
108	{	201	{
109	nreqs--;	202	ENTER;
110	//printf ("%d count %d %p->%p\n", rl, count, req, req->next);//D	203	SAVETMPS;
		204	PUSHMARK (SP);
		205	EXTEND (SP, 1);
111		206
112	if (req->type == REQ_QUIT)	207	switch (req->type)
113	started--;
114	else
115	{	208	{
116	int errorno = errno;	209	case EIO_READDIR:
117	errno = req->errorno;
118
119	if (req->type == REQ_READ)
120	SvCUR_set (req->data, req->dataoffset
121	+ req->result > 0 ? req->result : 0);
122
123	if (req->data)
124	SvREFCNT_dec (req->data);
125
126	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
127	{	210	{
128	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	211	SV *rv = &PL_sv_undef;
129	PL_laststatval = req->result;
130	PL_statcache = *(req->statdata);
131		212
132	Safefree (req->statdata);	213	if (req->result >= 0)
		214	{
		215	int i;
		216	char *buf = req->ptr2;
		217	AV *av = newAV ();
		218
		219	av_extend (av, req->result - 1);
		220
		221	for (i = 0; i < req->result; ++i)
		222	{
		223	SV *sv = newSVpv (buf, 0);
		224
		225	av_store (av, i, sv);
		226	buf += SvCUR (sv) + 1;
		227	}
		228
		229	rv = sv_2mortal (newRV_noinc ((SV *)av));
		230	}
		231
		232	PUSHs (rv);
133	}	233	}
		234	break;
134		235
135	PUSHMARK (SP);	236	case EIO_OPEN:
136	XPUSHs (sv_2mortal (newSViv (req->result)));
137
138	if (req->type == REQ_OPEN)
139	{	237	{
140	/* convert fd to fh */	238	/* convert fd to fh */
141	SV *fh;	239	SV *fh = &PL_sv_undef;
142		240
143	PUTBACK;	241	if (req->result >= 0)
144	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	242	{
145	SPAGAIN;	243	GV *gv = (GV *)sv_newmortal ();
		244	int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
		245	char sym [64];
		246	int symlen;
		247
		248	symlen = snprintf (sym, sizeof (sym), "fd#%d", req->result);
		249	gv_init (gv, stash, sym, symlen, 0);
146		250
147	fh = POPs;	251	symlen = snprintf (
		252	sym,
		253	sizeof (sym),
		254	"%s&=%d",
		255	flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
		256	req->result
		257	);
148		258
149	PUSHMARK (SP);	259	if (do_open (gv, sym, symlen, 0, 0, 0, 0))
		260	fh = (SV *)gv;
		261	}
		262
150	XPUSHs (fh);	263	PUSHs (fh);
151	}	264	}
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++;
165	}
166
167	prv = req;
168	req = req->next;
169	Safefree (prv);
170
171	/* TODO: croak on errors? */
172	}
173
174	//printf ("%d LEAVE %p %p\n", rl--, ress, rese);//D
175	return count;
176	}
177
178	static void *aio_proc(void *arg);
179
180	static void
181	start_thread (void)
182	{
183	sigset_t fullsigset, oldsigset;
184	pthread_t tid;
185	pthread_attr_t attr;
186
187	pthread_attr_init (&attr);
188	pthread_attr_setstacksize (&attr, STACKSIZE);
189	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
190
191	sigfillset (&fullsigset);
192	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
193
194	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
195	started++;
196
197	sigprocmask (SIG_SETMASK, &oldsigset, 0);
198	}
199
200	static void
201	send_req (aio_req req)
202	{
203	nreqs++;
204
205	pthread_mutex_lock (&reqlock);
206
207	req->next = 0;
208
209	if (reqe)
210	{
211	reqe->next = req;
212	reqe = req;
213	}
214	else
215	reqe = reqs = req;
216
217	pthread_cond_signal (&reqwait);
218	pthread_mutex_unlock (&reqlock);
219
220	while (nreqs > max_outstanding)
221	{
222	poll_wait ();
223	poll_cb ();
224	}
225	}
226
227	static void
228	end_thread (void)
229	{
230	aio_req req;
231	New (0, req, 1, aio_cb);
232	req->type = REQ_QUIT;
233
234	send_req (req);
235	}
236
237	static void
238	read_write (int dowrite, int fd, off_t offset, size_t length,
239	SV *data, STRLEN dataoffset, SV *callback)
240	{
241	aio_req req;
242	STRLEN svlen;
243	char *svptr = SvPV (data, svlen);
244
245	SvUPGRADE (data, SVt_PV);
246	SvPOK_on (data);
247
248	if (dataoffset < 0)
249	dataoffset += svlen;
250
251	if (dataoffset < 0 || dataoffset > svlen)
252	croak ("data offset outside of string");
253
254	if (dowrite)
255	{
256	/* write: check length and adjust. */
257	if (length < 0 || length + dataoffset > svlen)
258	length = svlen - dataoffset;
259	}
260	else
261	{
262	/* read: grow scalar as necessary */
263	svptr = SvGROW (data, length + dataoffset);
264	}
265
266	if (length < 0)
267	croak ("length must not be negative");
268
269	Newz (0, req, 1, aio_cb);
270
271	if (!req)
272	croak ("out of memory during aio_req allocation");
273
274	req->type = dowrite ? REQ_WRITE : REQ_READ;
275	req->fd = fd;
276	req->offset = offset;
277	req->length = length;
278	req->data = SvREFCNT_inc (data);
279	req->dataptr = (char *)svptr + dataoffset;
280	req->callback = SvREFCNT_inc (callback);
281
282	send_req (req);
283	}
284
285	static void *
286	aio_proc (void *thr_arg)
287	{
288	aio_req req;
289	int type;
290
291	do
292	{
293	pthread_mutex_lock (&reqlock);
294
295	for (;;)
296	{
297	req = reqs;
298
299	if (reqs)
300	{
301	reqs = reqs->next;
302	if (!reqs) reqe = 0;
303	}
304
305	if (req)
306	break;	265	break;
307		266
308	pthread_cond_wait (&reqwait, &reqlock);	267	case EIO_GROUP:
309	}	268	req->int1 = 2; /* mark group as finished */
310		269
311	pthread_mutex_unlock (&reqlock);	270	if (req->sv1)
312
313	errno = 0; /* strictly unnecessary */
314
315	type = req->type;
316
317	switch (type)
318	{	271	{
319	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	272	int i;
320	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	273	AV *av = (AV *)req->sv1;
321	#if SYS_readahead
322	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
323	#else
324	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
325	#endif
326		274
327	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	275	EXTEND (SP, AvFILL (av) + 1);
328	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	276	for (i = 0; i <= AvFILL (av); ++i)
329	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	277	PUSHs (*av_fetch (av, i, 0));
330		278	}
331	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
332	case REQ_CLOSE: req->result = close (req->fd); break;
333	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
334
335	case REQ_FSYNC: req->result = fsync (req->fd); break;
336	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
337
338	case REQ_QUIT:
339	break;	279	break;
340		280
		281	case EIO_NOP:
		282	case EIO_BUSY:
		283	break;
		284
		285	case EIO_READLINK:
		286	if (req->result > 0)
		287	PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
		288	break;
		289
		290	case EIO_STAT:
		291	case EIO_LSTAT:
		292	case EIO_FSTAT:
		293	PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
		294	PL_laststatval = req->result;
		295	PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
		296	PUSHs (sv_2mortal (newSViv (req->result)));
		297	break;
		298
		299	case EIO_READ:
		300	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		301	*SvEND (req->sv2) = 0;
		302	PUSHs (sv_2mortal (newSViv (req->result)));
		303	break;
		304
		305	case EIO_DUP2:
		306	if (req->result > 0)
		307	req->result = 0;
		308	/* FALLTHROUGH */
		309
341	default:	310	default:
342	req->result = ENOSYS;	311	PUSHs (sv_2mortal (newSViv (req->result)));
343	break;	312	break;
344	}	313	}
345		314
346	req->errorno = errno;	315	errno = req->errorno;
347		316
348	pthread_mutex_lock (&reslock);	317	PUTBACK;
		318	call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
		319	SPAGAIN;
349		320
350	req->next = 0;	321	FREETMPS;
		322	LEAVE;
351		323
352	if (rese)	324	PUTBACK;
353	{
354	rese->next = req;
355	rese = req;
356	}
357	else
358	{
359	rese = ress = req;
360
361	/* write a dummy byte to the pipe so fh becomes ready */
362	write (respipe [1], &respipe, 1);
363	}
364
365	pthread_mutex_unlock (&reslock);
366	}	325	}
367	while (type != REQ_QUIT);
368		326
		327	return !!SvTRUE (ERRSV);
		328	}
		329
		330	static void req_destroy (aio_req req)
		331	{
		332	if (req->self)
		333	{
		334	sv_unmagic (req->self, PERL_MAGIC_ext);
		335	SvREFCNT_dec (req->self);
		336	}
		337
		338	SvREFCNT_dec (req->sv1);
		339	SvREFCNT_dec (req->sv2);
		340	SvREFCNT_dec (req->callback);
		341
		342	Safefree (req);
		343	}
		344
		345	static void req_cancel_subs (aio_req grp)
		346	{
		347	aio_req sub;
		348
		349	if (grp->type != EIO_GROUP)
369	return 0;	350	return;
370	}
371		351
		352	SvREFCNT_dec (grp->sv2);
		353	grp->sv2 = 0;
		354
		355	eio_grp_cancel (grp);
		356	}
		357
		358	#ifdef USE_SOCKETS_AS_HANDLES
		359	# define TO_SOCKET(x) (win32_get_osfhandle (x))
		360	#else
		361	# define TO_SOCKET(x) (x)
		362	#endif
		363
		364	static void
		365	create_respipe (void)
		366	{
		367	int old_readfd = respipe [0];
		368
		369	if (respipe [1] >= 0)
		370	respipe_close (TO_SOCKET (respipe [1]));
		371
		372	#ifdef _WIN32
		373	if (PerlSock_socketpair (AF_UNIX, SOCK_STREAM, 0, respipe))
		374	#else
		375	if (pipe (respipe))
		376	#endif
		377	croak ("unable to initialize result pipe");
		378
		379	if (old_readfd >= 0)
		380	{
		381	if (dup2 (TO_SOCKET (respipe [0]), TO_SOCKET (old_readfd)) < 0)
		382	croak ("unable to initialize result pipe(2)");
		383
		384	respipe_close (respipe [0]);
		385	respipe [0] = old_readfd;
		386	}
		387
		388	#ifdef _WIN32
		389	int arg = 1;
		390	if (ioctlsocket (TO_SOCKET (respipe [0]), FIONBIO, &arg)
		391	|| ioctlsocket (TO_SOCKET (respipe [1]), FIONBIO, &arg))
		392	#else
		393	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)
		394	|| fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		395	#endif
		396	croak ("unable to initialize result pipe(3)");
		397
		398	respipe_osf [0] = TO_SOCKET (respipe [0]);
		399	respipe_osf [1] = TO_SOCKET (respipe [1]);
		400	}
		401
		402	static void poll_wait (void)
		403	{
		404	fd_set rfd;
		405
		406	while (eio_nreqs ())
		407	{
		408	int size;
		409
		410	X_LOCK (reslock);
		411	size = res_queue.size;
		412	X_UNLOCK (reslock);
		413
		414	if (size)
		415	return;
		416
		417	etp_maybe_start_thread ();
		418
		419	FD_ZERO (&rfd);
		420	FD_SET (respipe [0], &rfd);
		421
		422	PerlSock_select (respipe [0] + 1, &rfd, 0, 0, 0);
		423	}
		424	}
		425
		426	static int poll_cb (void)
		427	{
		428	for (;;)
		429	{
		430	int res = eio_poll ();
		431
		432	if (res > 0)
		433	croak (0);
		434
		435	if (!max_outstanding || max_outstanding > eio_nreqs ())
		436	return res;
		437
		438	poll_wait ();
		439	}
		440	}
		441
		442	static void atfork_child (void)
		443	{
		444	create_respipe ();
		445	}
		446
		447	#define dREQ \
		448	aio_req req; \
		449	int req_pri = next_pri; \
		450	next_pri = EIO_PRI_DEFAULT; \
		451	\
		452	if (SvOK (callback) && !SvROK (callback)) \
		453	croak ("callback must be undef or of reference type"); \
		454	\
		455	Newz (0, req, 1, eio_req); \
		456	if (!req) \
		457	croak ("out of memory during eio_req allocation"); \
		458	\
		459	req->callback = newSVsv (callback); \
		460	req->pri = req_pri
		461
		462	#define REQ_SEND \
		463	req_submit (req); \
		464	\
		465	if (GIMME_V != G_VOID) \
		466	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		467
372	MODULE = IO::AIO PACKAGE = IO::AIO	468	MODULE = IO::AIO PACKAGE = IO::AIO
373		469
374	PROTOTYPES: ENABLE	470	PROTOTYPES: ENABLE
375		471
376	BOOT:	472	BOOT:
377	{	473	{
378	if (pipe (respipe))	474	stash = gv_stashpv ("IO::AIO", 1);
379	croak ("unable to initialize result pipe");
380		475
381	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	476	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
382	croak ("cannot set result pipe to nonblocking mode");	477	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		478	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		479	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		480	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		481	#ifndef _WIN32
		482	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		483	#endif
383		484
384	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	485	create_respipe ();
385	croak ("cannot set result pipe to nonblocking mode");
386	}
387		486
		487	if (eio_init (want_poll, done_poll) < 0)
		488	croak ("IO::AIO: unable to initialise eio library");
		489
		490	/* atfork child called in fifo order, so before eio's handler */
		491	X_THREAD_ATFORK (0, 0, atfork_child);
		492	}
		493
388	void	494	void
389	min_parallel(nthreads)	495	max_poll_reqs (int nreqs)
390	int nthreads
391	PROTOTYPE: $	496	PROTOTYPE: $
392	CODE:	497	CODE:
393	while (nthreads > started)	498	eio_set_max_poll_reqs (nreqs);
394	start_thread ();
395		499
396	void	500	void
397	max_parallel(nthreads)	501	max_poll_time (double nseconds)
398	int nthreads
399	PROTOTYPE: $	502	PROTOTYPE: $
400	CODE:	503	CODE:
		504	eio_set_max_poll_time (nseconds);
		505
		506	void
		507	min_parallel (int nthreads)
		508	PROTOTYPE: $
		509	CODE:
		510	eio_set_min_parallel (nthreads);
		511
		512	void
		513	max_parallel (int nthreads)
		514	PROTOTYPE: $
		515	CODE:
		516	eio_set_max_parallel (nthreads);
		517
		518	void
		519	max_idle (int nthreads)
		520	PROTOTYPE: $
		521	CODE:
		522	eio_set_max_idle (nthreads);
		523
		524	void
		525	max_outstanding (int maxreqs)
		526	PROTOTYPE: $
		527	CODE:
		528	max_outstanding = maxreqs;
		529
		530	void
		531	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
		532	PROTOTYPE: $$$;$
		533	PPCODE:
401	{	534	{
402	int cur = started;	535	dREQ;
403	while (cur > nthreads)	536
404	{	537	req->type = EIO_OPEN;
405	end_thread ();	538	req->sv1 = newSVsv (pathname);
		539	req->ptr1 = SvPVbyte_nolen (req->sv1);
		540	req->int1 = flags;
		541	req->int2 = mode;
		542
		543	REQ_SEND;
		544	}
		545
		546	void
		547	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
		548	PROTOTYPE: $;$
		549	ALIAS:
		550	aio_fsync = EIO_FSYNC
		551	aio_fdatasync = EIO_FDATASYNC
		552	PPCODE:
		553	{
		554	dREQ;
		555
		556	req->type = ix;
		557	req->sv1 = newSVsv (fh);
		558	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		559
		560	REQ_SEND (req);
		561	}
		562
		563	void
		564	aio_close (SV *fh, SV *callback=&PL_sv_undef)
		565	PROTOTYPE: $;$
		566	PPCODE:
		567	{
		568	static int close_pipe = -1; /* dummy fd to close fds via dup2 */
		569	dREQ;
		570
		571	if (close_pipe < 0)
		572	{
		573	int pipefd [2];
		574
		575	if (pipe (pipefd) < 0
		576	|| close (pipefd [1]) < 0
		577	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
		578	abort (); /*D*/
		579
		580	close_pipe = pipefd [0];
		581	}
		582
		583	req->type = EIO_DUP2;
		584	req->int1 = close_pipe;
		585	req->sv2 = newSVsv (fh);
		586	req->int2 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		587
		588	REQ_SEND (req);
		589	}
		590
		591	void
		592	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
		593	ALIAS:
		594	aio_read = EIO_READ
		595	aio_write = EIO_WRITE
		596	PROTOTYPE: $$$$$;$
		597	PPCODE:
		598	{
		599	STRLEN svlen;
		600	char *svptr = SvPVbyte (data, svlen);
		601	UV len = SvUV (length);
		602
		603	SvUPGRADE (data, SVt_PV);
		604	SvPOK_on (data);
		605
		606	if (dataoffset < 0)
		607	dataoffset += svlen;
		608
		609	if (dataoffset < 0 || dataoffset > svlen)
		610	croak ("dataoffset outside of data scalar");
		611
		612	if (ix == EIO_WRITE)
		613	{
		614	/* write: check length and adjust. */
		615	if (!SvOK (length) || len + dataoffset > svlen)
		616	len = svlen - dataoffset;
		617	}
		618	else
		619	{
		620	/* read: grow scalar as necessary */
		621	svptr = SvGROW (data, len + dataoffset + 1);
		622	}
		623
		624	if (len < 0)
		625	croak ("length must not be negative");
		626
		627	{
		628	dREQ;
		629
		630	req->type = ix;
		631	req->sv1 = newSVsv (fh);
		632	req->int1 = PerlIO_fileno (ix == EIO_READ ? IoIFP (sv_2io (fh))
		633	: IoOFP (sv_2io (fh)));
		634	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		635	req->size = len;
		636	req->sv2 = SvREFCNT_inc (data);
		637	req->ptr2 = (char *)svptr + dataoffset;
		638	req->stroffset = dataoffset;
		639
		640	if (!SvREADONLY (data))
406	cur--;	641	{
		642	SvREADONLY_on (data);
		643	req->flags |= FLAG_SV2_RO_OFF;
407	}	644	}
408		645
409	while (started > nthreads)	646	REQ_SEND;
		647	}
		648	}
		649
		650	void
		651	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		652	PROTOTYPE: $$;$
		653	PPCODE:
		654	{
		655	SV *data;
		656	dREQ;
		657
		658	req->type = EIO_READLINK;
		659	req->sv1 = newSVsv (path);
		660	req->ptr1 = SvPVbyte_nolen (req->sv1);
		661
		662	REQ_SEND;
		663	}
		664
		665	void
		666	aio_sendfile (SV *out_fh, SV *in_fh, SV *in_offset, UV length, SV *callback=&PL_sv_undef)
		667	PROTOTYPE: $$$$;$
		668	PPCODE:
		669	{
		670	dREQ;
		671
		672	req->type = EIO_SENDFILE;
		673	req->sv1 = newSVsv (out_fh);
		674	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		675	req->sv2 = newSVsv (in_fh);
		676	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		677	req->offs = SvVAL64 (in_offset);
		678	req->size = length;
		679
		680	REQ_SEND;
		681	}
		682
		683	void
		684	aio_readahead (SV *fh, SV *offset, IV length, SV *callback=&PL_sv_undef)
		685	PROTOTYPE: $$$;$
		686	PPCODE:
		687	{
		688	dREQ;
		689
		690	req->type = EIO_READAHEAD;
		691	req->sv1 = newSVsv (fh);
		692	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		693	req->offs = SvVAL64 (offset);
		694	req->size = length;
		695
		696	REQ_SEND;
		697	}
		698
		699	void
		700	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
		701	ALIAS:
		702	aio_stat = EIO_STAT
		703	aio_lstat = EIO_LSTAT
		704	PPCODE:
		705	{
		706	dREQ;
		707
		708	req->sv1 = newSVsv (fh_or_path);
		709
		710	if (SvPOK (req->sv1))
		711	{
		712	req->type = ix;
		713	req->ptr1 = SvPVbyte_nolen (req->sv1);
		714	}
		715	else
		716	{
		717	req->type = EIO_FSTAT;
		718	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		719	}
		720
		721	REQ_SEND;
		722	}
		723
		724	void
		725	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		726	PPCODE:
		727	{
		728	dREQ;
		729
		730	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		731	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		732	req->sv1 = newSVsv (fh_or_path);
		733
		734	if (SvPOK (req->sv1))
		735	{
		736	req->type = EIO_UTIME;
		737	req->ptr1 = SvPVbyte_nolen (req->sv1);
		738	}
		739	else
		740	{
		741	req->type = EIO_FUTIME;
		742	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		743	}
		744
		745	REQ_SEND;
		746	}
		747
		748	void
		749	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		750	PPCODE:
		751	{
		752	dREQ;
		753
		754	req->sv1 = newSVsv (fh_or_path);
		755	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		756
		757	if (SvPOK (req->sv1))
		758	{
		759	req->type = EIO_TRUNCATE;
		760	req->ptr1 = SvPVbyte_nolen (req->sv1);
		761	}
		762	else
		763	{
		764	req->type = EIO_FTRUNCATE;
		765	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		766	}
		767
		768	REQ_SEND;
		769	}
		770
		771	void
		772	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		773	ALIAS:
		774	aio_chmod = EIO_CHMOD
		775	aio_mkdir = EIO_MKDIR
		776	PPCODE:
		777	{
		778	dREQ;
		779
		780	req->int2 = mode;
		781	req->sv1 = newSVsv (fh_or_path);
		782
		783	if (SvPOK (req->sv1))
		784	{
		785	req->type = ix;
		786	req->ptr1 = SvPVbyte_nolen (req->sv1);
		787	}
		788	else
		789	{
		790	req->type = EIO_FCHMOD;
		791	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		792	}
		793
		794	REQ_SEND;
		795	}
		796
		797	void
		798	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		799	PPCODE:
		800	{
		801	dREQ;
		802
		803	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		804	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		805	req->sv1 = newSVsv (fh_or_path);
		806
		807	if (SvPOK (req->sv1))
		808	{
		809	req->type = EIO_CHOWN;
		810	req->ptr1 = SvPVbyte_nolen (req->sv1);
		811	}
		812	else
		813	{
		814	req->type = EIO_FCHOWN;
		815	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		816	}
		817
		818	REQ_SEND;
		819	}
		820
		821	void
		822	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
		823	ALIAS:
		824	aio_unlink = EIO_UNLINK
		825	aio_rmdir = EIO_RMDIR
		826	aio_readdir = EIO_READDIR
		827	PPCODE:
		828	{
		829	dREQ;
		830
		831	req->type = ix;
		832	req->sv1 = newSVsv (pathname);
		833	req->ptr1 = SvPVbyte_nolen (req->sv1);
		834
		835	REQ_SEND;
		836	}
		837
		838	void
		839	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
		840	ALIAS:
		841	aio_link = EIO_LINK
		842	aio_symlink = EIO_SYMLINK
		843	aio_rename = EIO_RENAME
		844	PPCODE:
		845	{
		846	dREQ;
		847
		848	req->type = ix;
		849	req->sv1 = newSVsv (oldpath);
		850	req->ptr1 = SvPVbyte_nolen (req->sv1);
		851	req->sv2 = newSVsv (newpath);
		852	req->ptr2 = SvPVbyte_nolen (req->sv2);
		853
		854	REQ_SEND;
		855	}
		856
		857	void
		858	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
		859	PPCODE:
		860	{
		861	dREQ;
		862
		863	req->type = EIO_MKNOD;
		864	req->sv1 = newSVsv (pathname);
		865	req->ptr1 = SvPVbyte_nolen (req->sv1);
		866	req->int2 = (mode_t)mode;
		867	req->offs = dev;
		868
		869	REQ_SEND;
		870	}
		871
		872	void
		873	aio_busy (double delay, SV *callback=&PL_sv_undef)
		874	PPCODE:
		875	{
		876	dREQ;
		877
		878	req->type = EIO_BUSY;
		879	req->nv1 = delay < 0. ? 0. : delay;
		880
		881	REQ_SEND;
		882	}
		883
		884	void
		885	aio_group (SV *callback=&PL_sv_undef)
		886	PROTOTYPE: ;$
		887	PPCODE:
		888	{
		889	dREQ;
		890
		891	req->type = EIO_GROUP;
		892
		893	eio_submit (req);
		894	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		895	}
		896
		897	void
		898	aio_nop (SV *callback=&PL_sv_undef)
		899	ALIAS:
		900	aio_nop = EIO_NOP
		901	aio_sync = EIO_SYNC
		902	PPCODE:
		903	{
		904	dREQ;
		905
		906	req->type = ix;
		907
		908	REQ_SEND;
		909	}
		910
		911	int
		912	aioreq_pri (int pri = 0)
		913	PROTOTYPE: ;$
		914	CODE:
		915	RETVAL = next_pri;
		916	if (items > 0)
		917	{
		918	if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
		919	if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
		920	next_pri = pri;
		921	}
		922	OUTPUT:
		923	RETVAL
		924
		925	void
		926	aioreq_nice (int nice = 0)
		927	CODE:
		928	nice = next_pri - nice;
		929	if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
		930	if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
		931	next_pri = nice;
		932
		933	void
		934	flush ()
		935	PROTOTYPE:
		936	CODE:
		937	while (eio_nreqs ())
410	{	938	{
411	poll_wait ();	939	poll_wait ();
412	poll_cb ();	940	poll_cb ();
413	}	941	}
414	}
415		942
416	int	943	int
417	max_outstanding(nreqs)
418	int nreqs
419	PROTOTYPE: $
420	CODE:
421	RETVAL = max_outstanding;
422	max_outstanding = nreqs;
423
424	void
425	aio_open(pathname,flags,mode,callback=&PL_sv_undef)
426	SV * pathname
427	int flags
428	int mode
429	SV * callback
430	PROTOTYPE: $$$;$
431	CODE:
432	{
433	aio_req req;
434
435	Newz (0, req, 1, aio_cb);
436
437	if (!req)
438	croak ("out of memory during aio_req allocation");
439
440	req->type = REQ_OPEN;
441	req->data = newSVsv (pathname);
442	req->dataptr = SvPV_nolen (req->data);
443	req->fd = flags;
444	req->mode = mode;
445	req->callback = SvREFCNT_inc (callback);
446
447	send_req (req);
448	}
449
450	void
451	aio_close(fh,callback=&PL_sv_undef)
452	InputStream fh
453	SV * callback
454	PROTOTYPE: $;$
455	ALIAS:
456	aio_close = REQ_CLOSE
457	aio_fsync = REQ_FSYNC
458	aio_fdatasync = REQ_FDATASYNC
459	CODE:
460	{
461	aio_req req;
462
463	Newz (0, req, 1, aio_cb);
464
465	if (!req)
466	croak ("out of memory during aio_req allocation");
467
468	req->type = ix;
469	req->fd = PerlIO_fileno (fh);
470	req->callback = SvREFCNT_inc (callback);
471
472	send_req (req);
473	}
474
475	void
476	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
477	InputStream fh
478	UV offset
479	IV length
480	SV * data
481	IV dataoffset
482	SV * callback
483	PROTOTYPE: $$$$$;$
484	CODE:
485	read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
486
487	void
488	aio_write(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
489	OutputStream fh
490	UV offset
491	IV length
492	SV * data
493	IV dataoffset
494	SV * callback
495	PROTOTYPE: $$$$$;$
496	CODE:
497	read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
498
499	void
500	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
501	InputStream fh
502	UV offset
503	IV length
504	SV * callback
505	PROTOTYPE: $$$;$
506	CODE:
507	{
508	aio_req req;
509
510	if (length < 0)
511	croak ("length must not be negative");
512
513	Newz (0, req, 1, aio_cb);
514
515	if (!req)
516	croak ("out of memory during aio_req allocation");
517
518	req->type = REQ_READAHEAD;
519	req->fd = PerlIO_fileno (fh);
520	req->offset = offset;
521	req->length = length;
522	req->callback = SvREFCNT_inc (callback);
523
524	send_req (req);
525	}
526
527	void
528	aio_stat(fh_or_path,callback=&PL_sv_undef)
529	SV * fh_or_path
530	SV * callback
531	ALIAS:
532	aio_stat = REQ_STAT
533	aio_lstat = REQ_LSTAT
534	CODE:
535	{
536	aio_req req;
537
538	Newz (0, req, 1, aio_cb);
539
540	if (!req)
541	croak ("out of memory during aio_req allocation");
542
543	New (0, req->statdata, 1, Stat_t);
544
545	if (!req->statdata)
546	croak ("out of memory during aio_req->statdata allocation");
547
548	if (SvPOK (fh_or_path))
549	{
550	req->type = ix;
551	req->data = newSVsv (fh_or_path);
552	req->dataptr = SvPV_nolen (req->data);
553	}
554	else
555	{
556	req->type = REQ_FSTAT;
557	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
558	}
559
560	req->callback = SvREFCNT_inc (callback);
561
562	send_req (req);
563	}
564
565	void
566	aio_unlink(pathname,callback=&PL_sv_undef)
567	SV * pathname
568	SV * callback
569	CODE:
570	{
571	aio_req req;
572
573	Newz (0, req, 1, aio_cb);
574
575	if (!req)
576	croak ("out of memory during aio_req allocation");
577
578	req->type = REQ_UNLINK;
579	req->data = newSVsv (pathname);
580	req->dataptr = SvPV_nolen (req->data);
581	req->callback = SvREFCNT_inc (callback);
582
583	send_req (req);
584	}
585
586	void
587	flush()
588	PROTOTYPE:
589	CODE:
590	while (nreqs)
591	{
592	poll_wait ();
593	poll_cb ();
594	}
595
596	void
597	poll()	944	poll()
598	PROTOTYPE:	945	PROTOTYPE:
599	CODE:	946	CODE:
600	if (nreqs)
601	{
602	poll_wait ();	947	poll_wait ();
603	poll_cb ();	948	RETVAL = poll_cb ();
604	}	949	OUTPUT:
		950	RETVAL
605		951
606	int	952	int
607	poll_fileno()	953	poll_fileno()
608	PROTOTYPE:	954	PROTOTYPE:
609	CODE:	955	CODE:
…		…
621		967
622	void	968	void
623	poll_wait()	969	poll_wait()
624	PROTOTYPE:	970	PROTOTYPE:
625	CODE:	971	CODE:
626	if (nreqs)
627	poll_wait ();	972	poll_wait ();
628		973
629	int	974	int
630	nreqs()	975	nreqs()
631	PROTOTYPE:	976	PROTOTYPE:
632	CODE:	977	CODE:
633	RETVAL = nreqs;	978	RETVAL = eio_nreqs ();
634	OUTPUT:	979	OUTPUT:
635	RETVAL	980	RETVAL
636		981
		982	int
		983	nready()
		984	PROTOTYPE:
		985	CODE:
		986	RETVAL = eio_nready ();
		987	OUTPUT:
		988	RETVAL
		989
		990	int
		991	npending()
		992	PROTOTYPE:
		993	CODE:
		994	RETVAL = eio_npending ();
		995	OUTPUT:
		996	RETVAL
		997
		998	int
		999	nthreads()
		1000	PROTOTYPE:
		1001	CODE:
		1002	RETVAL = eio_nthreads ();
		1003	OUTPUT:
		1004	RETVAL
		1005
		1006	void _on_next_submit (SV *cb)
		1007	CODE:
		1008	SvREFCNT_dec (on_next_submit);
		1009	on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
		1010
		1011	PROTOTYPES: DISABLE
		1012
		1013	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1014
		1015	void
		1016	cancel (aio_req_ornot req)
		1017	CODE:
		1018	eio_cancel (req);
		1019
		1020	void
		1021	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1022	CODE:
		1023	SvREFCNT_dec (req->callback);
		1024	req->callback = newSVsv (callback);
		1025
		1026	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1027
		1028	void
		1029	add (aio_req grp, ...)
		1030	PPCODE:
		1031	{
		1032	int i;
		1033
		1034	if (grp->int1 == 2)
		1035	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1036
		1037	for (i = 1; i < items; ++i )
		1038	{
		1039	aio_req req;
		1040
		1041	if (GIMME_V != G_VOID)
		1042	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1043
		1044	req = SvAIO_REQ (ST (i));
		1045
		1046	if (req)
		1047	eio_grp_add (grp, req);
		1048	}
		1049	}
		1050
		1051	void
		1052	cancel_subs (aio_req_ornot req)
		1053	CODE:
		1054	req_cancel_subs (req);
		1055
		1056	void
		1057	result (aio_req grp, ...)
		1058	CODE:
		1059	{
		1060	int i;
		1061	AV *av;
		1062
		1063	grp->errorno = errno;
		1064
		1065	av = newAV ();
		1066
		1067	for (i = 1; i < items; ++i )
		1068	av_push (av, newSVsv (ST (i)));
		1069
		1070	SvREFCNT_dec (grp->sv1);
		1071	grp->sv1 = (SV *)av;
		1072	}
		1073
		1074	void
		1075	errno (aio_req grp, int errorno = errno)
		1076	CODE:
		1077	grp->errorno = errorno;
		1078
		1079	void
		1080	limit (aio_req grp, int limit)
		1081	CODE:
		1082	eio_grp_limit (grp, limit);
		1083
		1084	void
		1085	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1086	CODE:
		1087	{
		1088	SvREFCNT_dec (grp->sv2);
		1089	grp->sv2 = newSVsv (callback);
		1090
		1091	if (grp->int2 <= 0)
		1092	grp->int2 = 2;
		1093
		1094	eio_grp_limit (grp, grp->int2);
		1095	}
		1096

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