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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 1.126 by root, Thu Sep 25 07:56:07 2008 UTC

		1	#include "libeio/xthread.h"
		2
		3	#include <errno.h>
		4
1	#include "EXTERN.h"	5	#include "EXTERN.h"
2	#include "perl.h"	6	#include "perl.h"
3	#include "XSUB.h"	7	#include "XSUB.h"
4		8
		9	#include <stddef.h>
		10	#include <stdlib.h>
		11	#include <errno.h>
5	#include <sys/types.h>	12	#include <sys/types.h>
6	#include <sys/stat.h>	13	#include <sys/stat.h>
7
8	#include <unistd.h>	14	#include <limits.h>
9	#include <fcntl.h>	15	#include <fcntl.h>
10	#include <signal.h>
11	#include <sched.h>	16	#include <sched.h>
12	#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>
13	#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
14	#endif	68	#endif
15		69
16	#include <pthread.h>	70	/* perl stupidly overrides readdir and maybe others */
		71	/* with thread-unsafe versions, imagine that :( */
		72	#undef readdir
		73	#undef opendir
		74	#undef closedir
17		75
18	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	76	#define EIO_STRUCT_STAT Stat_t
19	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */
20	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
21		77
22	#if __ia64	78	/* use NV for 32 bit perls as it allows larger offsets */
23	# define STACKSIZE 65536	79	#if IVSIZE >= 8
		80	# define SvVAL64 SvIV
24	#else	81	#else
25	# define STACKSIZE 4096	82	# define SvVAL64 SvNV
26	#endif	83	#endif
27		84
		85	static HV *stash;
		86	typedef SV SV8; /* byte-sv, used for argument-checking */
		87
		88	#define AIO_REQ_KLASS "IO::AIO::REQ"
		89	#define AIO_GRP_KLASS "IO::AIO::GRP"
		90
		91	#define EIO_REQ_MEMBERS \
		92	SV *callback; \
		93	SV *sv1, *sv2; \
		94	STRLEN stroffset; \
		95	SV *self;
		96
		97	#define EIO_NO_WRAPPERS 1
		98
		99	#include "libeio/eio.h"
		100
		101	static int req_invoke (eio_req *req);
		102	#define EIO_FINISH(req) req_invoke (req)
		103	static void aio_grp_feed (eio_req *grp);
		104	#define EIO_FEED(req) aio_grp_feed (req)
		105	static void req_destroy (eio_req *grp);
		106	#define EIO_DESTROY(req) req_destroy (req)
		107
28	enum {	108	enum {
29	REQ_QUIT,	109	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
30	REQ_OPEN, REQ_CLOSE,
31	REQ_READ, REQ_WRITE, REQ_READAHEAD,
32	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,
33	REQ_FSYNC, REQ_FDATASYNC,
34	};	110	};
35		111
36	typedef struct aio_cb {	112	#include "libeio/eio.c"
37	struct aio_cb *volatile next;
38		113
39	int type;
40
41	int fd;
42	off_t offset;
43	size_t length;
44	ssize_t result;
45	mode_t mode; /* open */
46	int errorno;
47	SV *data, *callback, *fh;
48	void *dataptr;
49	STRLEN dataoffset;
50
51	Stat_t *statdata;
52	} aio_cb;
53
54	typedef aio_cb *aio_req;	114	typedef eio_req *aio_req;
		115	typedef eio_req *aio_req_ornot;
55		116
56	static int started;	117	static SV *on_next_submit;
57	static volatile int nreqs;	118	static int next_pri = EIO_PRI_DEFAULT;
58	static int max_outstanding = 1<<30;	119	static int max_outstanding;
59	static int respipe [2];
60		120
61	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	121	static int respipe_osf [2], respipe [2] = { -1, -1 };
62	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
63	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
64		122
65	static volatile aio_req reqs, reqe; /* queue start, queue end */	123	static void req_destroy (aio_req req);
66	static volatile aio_req ress, rese; /* queue start, queue end */	124	static void req_cancel (aio_req req);
67		125
68	static void	126	static void want_poll (void)
69	poll_wait ()
70	{	127	{
71	if (nreqs && !ress)	128	/* write a dummy byte to the pipe so fh becomes ready */
		129	respipe_write (respipe_osf [1], (const void *)&respipe_osf, 1);
		130	}
		131
		132	static void done_poll (void)
		133	{
		134	/* read any signals sent by the worker threads */
		135	char buf [4];
		136	while (respipe_read (respipe [0], buf, 4) == 4)
		137	;
		138	}
		139
		140	/* must be called at most once */
		141	static SV *req_sv (aio_req req, const char *klass)
		142	{
		143	if (!req->self)
72	{	144	{
73	fd_set rfd;	145	req->self = (SV *)newHV ();
74	FD_ZERO(&rfd);	146	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
75	FD_SET(respipe [0], &rfd);
76
77	select (respipe [0] + 1, &rfd, 0, 0, 0);
78	}	147	}
79	}
80		148
81	static int	149	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
82	poll_cb ()	150	}
		151
		152	static aio_req SvAIO_REQ (SV *sv)
		153	{
		154	MAGIC *mg;
		155
		156	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		157	croak ("object of class " AIO_REQ_KLASS " expected");
		158
		159	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		160
		161	return mg ? (aio_req)mg->mg_ptr : 0;
		162	}
		163
		164	static void aio_grp_feed (aio_req grp)
		165	{
		166	if (grp->sv2 && SvOK (grp->sv2))
		167	{
		168	dSP;
		169
		170	ENTER;
		171	SAVETMPS;
		172	PUSHMARK (SP);
		173	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		174	PUTBACK;
		175	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		176	SPAGAIN;
		177	FREETMPS;
		178	LEAVE;
		179	}
		180	}
		181
		182	static void req_submit (eio_req *req)
		183	{
		184	eio_submit (req);
		185
		186	if (on_next_submit)
		187	{
		188	dSP;
		189	SV *cb = sv_2mortal (on_next_submit);
		190
		191	on_next_submit = 0;
		192
		193	PUSHMARK (SP);
		194	PUTBACK;
		195	call_sv (cb, G_DISCARD | G_EVAL);
		196	}
		197	}
		198
		199	static int req_invoke (eio_req *req)
83	{	200	{
84	dSP;	201	dSP;
85	int count = 0;
86	aio_req req, prv;
87		202
88	pthread_mutex_lock (&reslock);	203	if (req->flags & FLAG_SV2_RO_OFF)
		204	SvREADONLY_off (req->sv2);
89		205
90	{	206	if (!EIO_CANCELLED (req) && SvOK (req->callback))
91	/* read any signals sent by the worker threads */
92	char buf [32];
93	while (read (respipe [0], buf, 32) > 0)
94	;
95	}
96
97	req = ress;
98	ress = rese = 0;
99
100	pthread_mutex_unlock (&reslock);
101
102	while (req)
103	{	207	{
104	nreqs--;	208	ENTER;
		209	SAVETMPS;
		210	PUSHMARK (SP);
		211	EXTEND (SP, 1);
105		212
106	if (req->type == REQ_QUIT)	213	switch (req->type)
107	started--;
108	else
109	{	214	{
110	int errorno = errno;	215	case EIO_READDIR:
111	errno = req->errorno;
112
113	if (req->type == REQ_READ)
114	SvCUR_set (req->data, req->dataoffset
115	+ req->result > 0 ? req->result : 0);
116
117	if (req->data)
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	{	216	{
125	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	217	SV *rv = &PL_sv_undef;
126	PL_laststatval = req->result;
127	PL_statcache = *(req->statdata);
128		218
129	Safefree (req->statdata);	219	if (req->result >= 0)
		220	{
		221	int i;
		222	char *buf = req->ptr2;
		223	AV *av = newAV ();
		224
		225	av_extend (av, req->result - 1);
		226
		227	for (i = 0; i < req->result; ++i)
		228	{
		229	SV *sv = newSVpv (buf, 0);
		230
		231	av_store (av, i, sv);
		232	buf += SvCUR (sv) + 1;
		233	}
		234
		235	rv = sv_2mortal (newRV_noinc ((SV *)av));
		236	}
		237
		238	PUSHs (rv);
130	}	239	}
		240	break;
131		241
132	ENTER;	242	case EIO_OPEN:
133	PUSHMARK (SP);
134	XPUSHs (sv_2mortal (newSViv (req->result)));
135
136	if (req->type == REQ_OPEN)
137	{	243	{
138	/* convert fd to fh */	244	/* convert fd to fh */
139	SV *fh;	245	SV *fh = &PL_sv_undef;
140		246
141	PUTBACK;	247	if (req->result >= 0)
142	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	248	{
143	SPAGAIN;	249	GV *gv = (GV *)sv_newmortal ();
		250	int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
		251	char sym [64];
		252	int symlen;
		253
		254	symlen = snprintf (sym, sizeof (sym), "fd#%d", req->result);
		255	gv_init (gv, stash, sym, symlen, 0);
144		256
145	fh = SvREFCNT_inc (POPs);	257	symlen = snprintf (
		258	sym,
		259	sizeof (sym),
		260	"%s&=%d",
		261	flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
		262	req->result
		263	);
146		264
		265	if (do_open (gv, sym, symlen, 0, 0, 0, 0))
		266	fh = (SV *)gv;
		267	}
		268
147	PUSHMARK (SP);	269	PUSHs (fh);
148	XPUSHs (sv_2mortal (fh));
149	}	270	}
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++;
165	}
166
167	prv = req;
168	req = req->next;
169	Safefree (prv);
170
171	/* TODO: croak on errors? */
172	}
173
174	return count;
175	}
176
177	static void *aio_proc(void *arg);
178
179	static void
180	start_thread (void)
181	{
182	sigset_t fullsigset, oldsigset;
183	pthread_t tid;
184	pthread_attr_t attr;
185
186	pthread_attr_init (&attr);
187	pthread_attr_setstacksize (&attr, STACKSIZE);
188	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
189
190	sigfillset (&fullsigset);
191	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
192
193	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
194	started++;
195
196	sigprocmask (SIG_SETMASK, &oldsigset, 0);
197	}
198
199	static void
200	send_req (aio_req req)
201	{
202	nreqs++;
203
204	pthread_mutex_lock (&reqlock);
205
206	req->next = 0;
207
208	if (reqe)
209	{
210	reqe->next = req;
211	reqe = req;
212	}
213	else
214	reqe = reqs = req;
215
216	pthread_cond_signal (&reqwait);
217	pthread_mutex_unlock (&reqlock);
218
219	while (nreqs > max_outstanding)
220	{
221	poll_wait ();
222	poll_cb ();
223	}
224	}
225
226	static void
227	end_thread (void)
228	{
229	aio_req req;
230	New (0, req, 1, aio_cb);
231	req->type = REQ_QUIT;
232
233	send_req (req);
234	}
235
236	static void *
237	aio_proc (void *thr_arg)
238	{
239	aio_req req;
240	int type;
241
242	do
243	{
244	pthread_mutex_lock (&reqlock);
245
246	for (;;)
247	{
248	req = reqs;
249
250	if (reqs)
251	{
252	reqs = reqs->next;
253	if (!reqs) reqe = 0;
254	}
255
256	if (req)
257	break;	271	break;
258		272
259	pthread_cond_wait (&reqwait, &reqlock);	273	case EIO_GROUP:
260	}	274	req->int1 = 2; /* mark group as finished */
261		275
262	pthread_mutex_unlock (&reqlock);	276	if (req->sv1)
263
264	errno = 0; /* strictly unnecessary */
265
266	type = req->type;
267
268	switch (type)
269	{	277	{
270	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	278	int i;
271	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	279	AV *av = (AV *)req->sv1;
272	#if SYS_readahead
273	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
274	#else
275	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
276	#endif
277		280
278	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	281	EXTEND (SP, AvFILL (av) + 1);
279	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	282	for (i = 0; i <= AvFILL (av); ++i)
280	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	283	PUSHs (*av_fetch (av, i, 0));
281		284	}
282	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
283	case REQ_CLOSE: req->result = close (req->fd); break;
284	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
285
286	case REQ_FSYNC: req->result = fsync (req->fd); break;
287	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
288
289	case REQ_QUIT:
290	break;	285	break;
291		286
		287	case EIO_NOP:
		288	case EIO_BUSY:
		289	break;
		290
		291	case EIO_READLINK:
		292	if (req->result > 0)
		293	PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
		294	break;
		295
		296	case EIO_STAT:
		297	case EIO_LSTAT:
		298	case EIO_FSTAT:
		299	PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
		300	PL_laststatval = req->result;
		301	PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
		302	PUSHs (sv_2mortal (newSViv (req->result)));
		303	break;
		304
		305	case EIO_READ:
		306	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		307	*SvEND (req->sv2) = 0;
		308	PUSHs (sv_2mortal (newSViv (req->result)));
		309	break;
		310
		311	case EIO_DUP2:
		312	if (req->result > 0)
		313	req->result = 0;
		314	/* FALLTHROUGH */
		315
292	default:	316	default:
293	req->result = ENOSYS;	317	PUSHs (sv_2mortal (newSViv (req->result)));
294	break;	318	break;
295	}	319	}
296		320
297	req->errorno = errno;	321	errno = req->errorno;
298		322
299	pthread_mutex_lock (&reslock);	323	PUTBACK;
		324	call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
		325	SPAGAIN;
300		326
301	req->next = 0;	327	FREETMPS;
		328	LEAVE;
302		329
303	if (rese)	330	PUTBACK;
304	{
305	rese->next = req;
306	rese = req;
307	}
308	else
309	{
310	rese = ress = req;
311
312	/* write a dummy byte to the pipe so fh becomes ready */
313	write (respipe [1], &respipe, 1);
314	}
315
316	pthread_mutex_unlock (&reslock);
317	}	331	}
318	while (type != REQ_QUIT);
319		332
		333	return !!SvTRUE (ERRSV);
		334	}
		335
		336	static void req_destroy (aio_req req)
		337	{
		338	if (req->self)
		339	{
		340	sv_unmagic (req->self, PERL_MAGIC_ext);
		341	SvREFCNT_dec (req->self);
		342	}
		343
		344	SvREFCNT_dec (req->sv1);
		345	SvREFCNT_dec (req->sv2);
		346	SvREFCNT_dec (req->callback);
		347
		348	Safefree (req);
		349	}
		350
		351	static void req_cancel_subs (aio_req grp)
		352	{
		353	aio_req sub;
		354
		355	if (grp->type != EIO_GROUP)
320	return 0;	356	return;
321	}
322		357
		358	SvREFCNT_dec (grp->sv2);
		359	grp->sv2 = 0;
		360
		361	eio_grp_cancel (grp);
		362	}
		363
		364	#ifdef USE_SOCKETS_AS_HANDLES
		365	# define TO_SOCKET(x) (win32_get_osfhandle (x))
		366	#else
		367	# define TO_SOCKET(x) (x)
		368	#endif
		369
		370	static void
		371	create_respipe (void)
		372	{
		373	int old_readfd = respipe [0];
		374
		375	if (respipe [1] >= 0)
		376	respipe_close (TO_SOCKET (respipe [1]));
		377
		378	#ifdef _WIN32
		379	if (PerlSock_socketpair (AF_UNIX, SOCK_STREAM, 0, respipe))
		380	#else
		381	if (pipe (respipe))
		382	#endif
		383	croak ("unable to initialize result pipe");
		384
		385	if (old_readfd >= 0)
		386	{
		387	if (dup2 (TO_SOCKET (respipe [0]), TO_SOCKET (old_readfd)) < 0)
		388	croak ("unable to initialize result pipe(2)");
		389
		390	respipe_close (respipe [0]);
		391	respipe [0] = old_readfd;
		392	}
		393
		394	#ifdef _WIN32
		395	int arg = 1;
		396	if (ioctlsocket (TO_SOCKET (respipe [0]), FIONBIO, &arg)
		397	|| ioctlsocket (TO_SOCKET (respipe [1]), FIONBIO, &arg))
		398	#else
		399	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)
		400	|| fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		401	#endif
		402	croak ("unable to initialize result pipe(3)");
		403
		404	respipe_osf [0] = TO_SOCKET (respipe [0]);
		405	respipe_osf [1] = TO_SOCKET (respipe [1]);
		406	}
		407
		408	static void poll_wait (void)
		409	{
		410	fd_set rfd;
		411
		412	while (eio_nreqs ())
		413	{
		414	int size;
		415
		416	X_LOCK (reslock);
		417	size = res_queue.size;
		418	X_UNLOCK (reslock);
		419
		420	if (size)
		421	return;
		422
		423	etp_maybe_start_thread ();
		424
		425	FD_ZERO (&rfd);
		426	FD_SET (respipe [0], &rfd);
		427
		428	PerlSock_select (respipe [0] + 1, &rfd, 0, 0, 0);
		429	}
		430	}
		431
		432	static int poll_cb (void)
		433	{
		434	for (;;)
		435	{
		436	int res = eio_poll ();
		437
		438	if (res > 0)
		439	croak (0);
		440
		441	if (!max_outstanding || max_outstanding > eio_nreqs ())
		442	return res;
		443
		444	poll_wait ();
		445	}
		446	}
		447
		448	static void atfork_child (void)
		449	{
		450	create_respipe ();
		451	}
		452
		453	#define dREQ \
		454	aio_req req; \
		455	int req_pri = next_pri; \
		456	next_pri = EIO_PRI_DEFAULT; \
		457	\
		458	if (SvOK (callback) && !SvROK (callback)) \
		459	croak ("callback must be undef or of reference type"); \
		460	\
		461	Newz (0, req, 1, eio_req); \
		462	if (!req) \
		463	croak ("out of memory during eio_req allocation"); \
		464	\
		465	req->callback = newSVsv (callback); \
		466	req->pri = req_pri
		467
		468	#define REQ_SEND \
		469	PUTBACK; \
		470	req_submit (req); \
		471	SPAGAIN; \
		472	\
		473	if (GIMME_V != G_VOID) \
		474	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		475
323	MODULE = IO::AIO PACKAGE = IO::AIO	476	MODULE = IO::AIO PACKAGE = IO::AIO
324		477
325	PROTOTYPES: ENABLE	478	PROTOTYPES: ENABLE
326		479
327	BOOT:	480	BOOT:
328	{	481	{
329	if (pipe (respipe))	482	stash = gv_stashpv ("IO::AIO", 1);
330	croak ("unable to initialize result pipe");
331		483
332	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	484	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
333	croak ("cannot set result pipe to nonblocking mode");	485	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		486	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		487	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		488	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		489	#ifndef _WIN32
		490	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		491	#endif
334		492
335	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	493	create_respipe ();
336	croak ("cannot set result pipe to nonblocking mode");
337	}
338		494
		495	if (eio_init (want_poll, done_poll) < 0)
		496	croak ("IO::AIO: unable to initialise eio library");
		497
		498	/* atfork child called in fifo order, so before eio's handler */
		499	X_THREAD_ATFORK (0, 0, atfork_child);
		500	}
		501
339	void	502	void
340	min_parallel(nthreads)	503	max_poll_reqs (int nreqs)
341	int nthreads
342	PROTOTYPE: $	504	PROTOTYPE: $
343	CODE:	505	CODE:
344	while (nthreads > started)	506	eio_set_max_poll_reqs (nreqs);
345	start_thread ();
346		507
347	void	508	void
348	max_parallel(nthreads)	509	max_poll_time (double nseconds)
349	int nthreads
350	PROTOTYPE: $	510	PROTOTYPE: $
351	CODE:	511	CODE:
		512	eio_set_max_poll_time (nseconds);
		513
		514	void
		515	min_parallel (int nthreads)
		516	PROTOTYPE: $
		517	CODE:
		518	eio_set_min_parallel (nthreads);
		519
		520	void
		521	max_parallel (int nthreads)
		522	PROTOTYPE: $
		523	CODE:
		524	eio_set_max_parallel (nthreads);
		525
		526	void
		527	max_idle (int nthreads)
		528	PROTOTYPE: $
		529	CODE:
		530	eio_set_max_idle (nthreads);
		531
		532	void
		533	max_outstanding (int maxreqs)
		534	PROTOTYPE: $
		535	CODE:
		536	max_outstanding = maxreqs;
		537
		538	void
		539	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
		540	PROTOTYPE: $$$;$
		541	PPCODE:
352	{	542	{
353	int cur = started;	543	dREQ;
354	while (cur > nthreads)	544
355	{	545	req->type = EIO_OPEN;
356	end_thread ();	546	req->sv1 = newSVsv (pathname);
		547	req->ptr1 = SvPVbyte_nolen (req->sv1);
		548	req->int1 = flags;
		549	req->int2 = mode;
		550
		551	REQ_SEND;
		552	}
		553
		554	void
		555	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
		556	PROTOTYPE: $;$
		557	ALIAS:
		558	aio_fsync = EIO_FSYNC
		559	aio_fdatasync = EIO_FDATASYNC
		560	PPCODE:
		561	{
		562	dREQ;
		563
		564	req->type = ix;
		565	req->sv1 = newSVsv (fh);
		566	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		567
		568	REQ_SEND (req);
		569	}
		570
		571	void
		572	aio_close (SV *fh, SV *callback=&PL_sv_undef)
		573	PROTOTYPE: $;$
		574	PPCODE:
		575	{
		576	static int close_pipe = -1; /* dummy fd to close fds via dup2 */
		577	dREQ;
		578
		579	if (close_pipe < 0)
		580	{
		581	int pipefd [2];
		582
		583	if (pipe (pipefd) < 0
		584	|| close (pipefd [1]) < 0
		585	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
		586	abort (); /*D*/
		587
		588	close_pipe = pipefd [0];
		589	}
		590
		591	req->type = EIO_DUP2;
		592	req->int1 = close_pipe;
		593	req->sv2 = newSVsv (fh);
		594	req->int2 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		595
		596	REQ_SEND (req);
		597	}
		598
		599	void
		600	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
		601	ALIAS:
		602	aio_read = EIO_READ
		603	aio_write = EIO_WRITE
		604	PROTOTYPE: $$$$$;$
		605	PPCODE:
		606	{
		607	STRLEN svlen;
		608	char *svptr = SvPVbyte (data, svlen);
		609	UV len = SvUV (length);
		610
		611	SvUPGRADE (data, SVt_PV);
		612	SvPOK_on (data);
		613
		614	if (dataoffset < 0)
		615	dataoffset += svlen;
		616
		617	if (dataoffset < 0 || dataoffset > svlen)
		618	croak ("dataoffset outside of data scalar");
		619
		620	if (ix == EIO_WRITE)
		621	{
		622	/* write: check length and adjust. */
		623	if (!SvOK (length) || len + dataoffset > svlen)
		624	len = svlen - dataoffset;
		625	}
		626	else
		627	{
		628	/* read: grow scalar as necessary */
		629	svptr = SvGROW (data, len + dataoffset + 1);
		630	}
		631
		632	if (len < 0)
		633	croak ("length must not be negative");
		634
		635	{
		636	dREQ;
		637
		638	req->type = ix;
		639	req->sv1 = newSVsv (fh);
		640	req->int1 = PerlIO_fileno (ix == EIO_READ ? IoIFP (sv_2io (fh))
		641	: IoOFP (sv_2io (fh)));
		642	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		643	req->size = len;
		644	req->sv2 = SvREFCNT_inc (data);
		645	req->ptr2 = (char *)svptr + dataoffset;
		646	req->stroffset = dataoffset;
		647
		648	if (!SvREADONLY (data))
357	cur--;	649	{
		650	SvREADONLY_on (data);
		651	req->flags |= FLAG_SV2_RO_OFF;
358	}	652	}
359		653
360	while (started > nthreads)	654	REQ_SEND;
		655	}
		656	}
		657
		658	void
		659	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		660	PROTOTYPE: $$;$
		661	PPCODE:
		662	{
		663	SV *data;
		664	dREQ;
		665
		666	req->type = EIO_READLINK;
		667	req->sv1 = newSVsv (path);
		668	req->ptr1 = SvPVbyte_nolen (req->sv1);
		669
		670	REQ_SEND;
		671	}
		672
		673	void
		674	aio_sendfile (SV *out_fh, SV *in_fh, SV *in_offset, UV length, SV *callback=&PL_sv_undef)
		675	PROTOTYPE: $$$$;$
		676	PPCODE:
		677	{
		678	dREQ;
		679
		680	req->type = EIO_SENDFILE;
		681	req->sv1 = newSVsv (out_fh);
		682	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		683	req->sv2 = newSVsv (in_fh);
		684	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		685	req->offs = SvVAL64 (in_offset);
		686	req->size = length;
		687
		688	REQ_SEND;
		689	}
		690
		691	void
		692	aio_readahead (SV *fh, SV *offset, IV length, SV *callback=&PL_sv_undef)
		693	PROTOTYPE: $$$;$
		694	PPCODE:
		695	{
		696	dREQ;
		697
		698	req->type = EIO_READAHEAD;
		699	req->sv1 = newSVsv (fh);
		700	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		701	req->offs = SvVAL64 (offset);
		702	req->size = length;
		703
		704	REQ_SEND;
		705	}
		706
		707	void
		708	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
		709	ALIAS:
		710	aio_stat = EIO_STAT
		711	aio_lstat = EIO_LSTAT
		712	PPCODE:
		713	{
		714	dREQ;
		715
		716	req->sv1 = newSVsv (fh_or_path);
		717
		718	if (SvPOK (req->sv1))
		719	{
		720	req->type = ix;
		721	req->ptr1 = SvPVbyte_nolen (req->sv1);
		722	}
		723	else
		724	{
		725	req->type = EIO_FSTAT;
		726	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		727	}
		728
		729	REQ_SEND;
		730	}
		731
		732	void
		733	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		734	PPCODE:
		735	{
		736	dREQ;
		737
		738	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		739	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		740	req->sv1 = newSVsv (fh_or_path);
		741
		742	if (SvPOK (req->sv1))
		743	{
		744	req->type = EIO_UTIME;
		745	req->ptr1 = SvPVbyte_nolen (req->sv1);
		746	}
		747	else
		748	{
		749	req->type = EIO_FUTIME;
		750	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		751	}
		752
		753	REQ_SEND;
		754	}
		755
		756	void
		757	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		758	PPCODE:
		759	{
		760	dREQ;
		761
		762	req->sv1 = newSVsv (fh_or_path);
		763	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		764
		765	if (SvPOK (req->sv1))
		766	{
		767	req->type = EIO_TRUNCATE;
		768	req->ptr1 = SvPVbyte_nolen (req->sv1);
		769	}
		770	else
		771	{
		772	req->type = EIO_FTRUNCATE;
		773	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		774	}
		775
		776	REQ_SEND;
		777	}
		778
		779	void
		780	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		781	ALIAS:
		782	aio_chmod = EIO_CHMOD
		783	aio_mkdir = EIO_MKDIR
		784	PPCODE:
		785	{
		786	dREQ;
		787
		788	req->int2 = mode;
		789	req->sv1 = newSVsv (fh_or_path);
		790
		791	if (SvPOK (req->sv1))
		792	{
		793	req->type = ix;
		794	req->ptr1 = SvPVbyte_nolen (req->sv1);
		795	}
		796	else
		797	{
		798	req->type = EIO_FCHMOD;
		799	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		800	}
		801
		802	REQ_SEND;
		803	}
		804
		805	void
		806	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		807	PPCODE:
		808	{
		809	dREQ;
		810
		811	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		812	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		813	req->sv1 = newSVsv (fh_or_path);
		814
		815	if (SvPOK (req->sv1))
		816	{
		817	req->type = EIO_CHOWN;
		818	req->ptr1 = SvPVbyte_nolen (req->sv1);
		819	}
		820	else
		821	{
		822	req->type = EIO_FCHOWN;
		823	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		824	}
		825
		826	REQ_SEND;
		827	}
		828
		829	void
		830	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
		831	ALIAS:
		832	aio_unlink = EIO_UNLINK
		833	aio_rmdir = EIO_RMDIR
		834	aio_readdir = EIO_READDIR
		835	PPCODE:
		836	{
		837	dREQ;
		838
		839	req->type = ix;
		840	req->sv1 = newSVsv (pathname);
		841	req->ptr1 = SvPVbyte_nolen (req->sv1);
		842
		843	REQ_SEND;
		844	}
		845
		846	void
		847	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
		848	ALIAS:
		849	aio_link = EIO_LINK
		850	aio_symlink = EIO_SYMLINK
		851	aio_rename = EIO_RENAME
		852	PPCODE:
		853	{
		854	dREQ;
		855
		856	req->type = ix;
		857	req->sv1 = newSVsv (oldpath);
		858	req->ptr1 = SvPVbyte_nolen (req->sv1);
		859	req->sv2 = newSVsv (newpath);
		860	req->ptr2 = SvPVbyte_nolen (req->sv2);
		861
		862	REQ_SEND;
		863	}
		864
		865	void
		866	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
		867	PPCODE:
		868	{
		869	dREQ;
		870
		871	req->type = EIO_MKNOD;
		872	req->sv1 = newSVsv (pathname);
		873	req->ptr1 = SvPVbyte_nolen (req->sv1);
		874	req->int2 = (mode_t)mode;
		875	req->offs = dev;
		876
		877	REQ_SEND;
		878	}
		879
		880	void
		881	aio_busy (double delay, SV *callback=&PL_sv_undef)
		882	PPCODE:
		883	{
		884	dREQ;
		885
		886	req->type = EIO_BUSY;
		887	req->nv1 = delay < 0. ? 0. : delay;
		888
		889	REQ_SEND;
		890	}
		891
		892	void
		893	aio_group (SV *callback=&PL_sv_undef)
		894	PROTOTYPE: ;$
		895	PPCODE:
		896	{
		897	dREQ;
		898
		899	req->type = EIO_GROUP;
		900
		901	eio_submit (req);
		902	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		903	}
		904
		905	void
		906	aio_nop (SV *callback=&PL_sv_undef)
		907	ALIAS:
		908	aio_nop = EIO_NOP
		909	aio_sync = EIO_SYNC
		910	PPCODE:
		911	{
		912	dREQ;
		913
		914	req->type = ix;
		915
		916	REQ_SEND;
		917	}
		918
		919	int
		920	aioreq_pri (int pri = 0)
		921	PROTOTYPE: ;$
		922	CODE:
		923	RETVAL = next_pri;
		924	if (items > 0)
		925	{
		926	if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
		927	if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
		928	next_pri = pri;
		929	}
		930	OUTPUT:
		931	RETVAL
		932
		933	void
		934	aioreq_nice (int nice = 0)
		935	CODE:
		936	nice = next_pri - nice;
		937	if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
		938	if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
		939	next_pri = nice;
		940
		941	void
		942	flush ()
		943	PROTOTYPE:
		944	CODE:
		945	while (eio_nreqs ())
361	{	946	{
362	poll_wait ();	947	poll_wait ();
363	poll_cb ();	948	poll_cb ();
364	}	949	}
365	}
366		950
367	int	951	int
368	max_outstanding(nreqs)
369	int nreqs
370	PROTOTYPE: $
371	CODE:
372	RETVAL = max_outstanding;
373	max_outstanding = nreqs;
374
375	void
376	aio_open(pathname,flags,mode,callback=&PL_sv_undef)
377	SV * pathname
378	int flags
379	int mode
380	SV * callback
381	PROTOTYPE: $$$;$
382	CODE:
383	{
384	aio_req req;
385
386	Newz (0, req, 1, aio_cb);
387
388	if (!req)
389	croak ("out of memory during aio_req allocation");
390
391	req->type = REQ_OPEN;
392	req->data = newSVsv (pathname);
393	req->dataptr = SvPV_nolen (req->data);
394	req->fd = flags;
395	req->mode = mode;
396	req->callback = SvREFCNT_inc (callback);
397
398	send_req (req);
399	}
400
401	void
402	aio_close(fh,callback=&PL_sv_undef)
403	SV * fh
404	SV * callback
405	PROTOTYPE: $;$
406	ALIAS:
407	aio_close = REQ_CLOSE
408	aio_fsync = REQ_FSYNC
409	aio_fdatasync = REQ_FDATASYNC
410	CODE:
411	{
412	aio_req req;
413
414	Newz (0, req, 1, aio_cb);
415
416	if (!req)
417	croak ("out of memory during aio_req allocation");
418
419	req->type = ix;
420	req->fh = newSVsv (fh);
421	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
422	req->callback = SvREFCNT_inc (callback);
423
424	send_req (req);
425	}
426
427	void
428	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
429	SV * fh
430	UV offset
431	IV length
432	SV * data
433	IV dataoffset
434	SV * callback
435	ALIAS:
436	aio_read = REQ_READ
437	aio_write = REQ_WRITE
438	PROTOTYPE: $$$$$;$
439	CODE:
440	{
441	aio_req req;
442	STRLEN svlen;
443	char *svptr = SvPV (data, svlen);
444
445	SvUPGRADE (data, SVt_PV);
446	SvPOK_on (data);
447
448	if (dataoffset < 0)
449	dataoffset += svlen;
450
451	if (dataoffset < 0 || dataoffset > svlen)
452	croak ("data offset outside of string");
453
454	if (ix == REQ_WRITE)
455	{
456	/* write: check length and adjust. */
457	if (length < 0 || length + dataoffset > svlen)
458	length = svlen - dataoffset;
459	}
460	else
461	{
462	/* read: grow scalar as necessary */
463	svptr = SvGROW (data, length + dataoffset);
464	}
465
466	if (length < 0)
467	croak ("length must not be negative");
468
469	Newz (0, req, 1, aio_cb);
470
471	if (!req)
472	croak ("out of memory during aio_req allocation");
473
474	req->type = ix;
475	req->fh = newSVsv (fh);
476	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
477	: IoOFP (sv_2io (fh)));
478	req->offset = offset;
479	req->length = length;
480	req->data = SvREFCNT_inc (data);
481	req->dataptr = (char *)svptr + dataoffset;
482	req->callback = SvREFCNT_inc (callback);
483
484	send_req (req);
485	}
486
487	void
488	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
489	SV * fh
490	UV offset
491	IV length
492	SV * callback
493	PROTOTYPE: $$$;$
494	CODE:
495	{
496	aio_req req;
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
506	req->type = REQ_READAHEAD;
507	req->fh = newSVsv (fh);
508	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
509	req->offset = offset;
510	req->length = length;
511	req->callback = SvREFCNT_inc (callback);
512
513	send_req (req);
514	}
515
516	void
517	aio_stat(fh_or_path,callback=&PL_sv_undef)
518	SV * fh_or_path
519	SV * callback
520	ALIAS:
521	aio_stat = REQ_STAT
522	aio_lstat = REQ_LSTAT
523	CODE:
524	{
525	aio_req req;
526
527	Newz (0, req, 1, aio_cb);
528
529	if (!req)
530	croak ("out of memory during aio_req allocation");
531
532	New (0, req->statdata, 1, Stat_t);
533
534	if (!req->statdata)
535	croak ("out of memory during aio_req->statdata allocation");
536
537	if (SvPOK (fh_or_path))
538	{
539	req->type = ix;
540	req->data = newSVsv (fh_or_path);
541	req->dataptr = SvPV_nolen (req->data);
542	}
543	else
544	{
545	req->type = REQ_FSTAT;
546	req->fh = newSVsv (fh_or_path);
547	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
548	}
549
550	req->callback = SvREFCNT_inc (callback);
551
552	send_req (req);
553	}
554
555	void
556	aio_unlink(pathname,callback=&PL_sv_undef)
557	SV * pathname
558	SV * callback
559	CODE:
560	{
561	aio_req req;
562
563	Newz (0, req, 1, aio_cb);
564
565	if (!req)
566	croak ("out of memory during aio_req allocation");
567
568	req->type = REQ_UNLINK;
569	req->data = newSVsv (pathname);
570	req->dataptr = SvPV_nolen (req->data);
571	req->callback = SvREFCNT_inc (callback);
572
573	send_req (req);
574	}
575
576	void
577	flush()
578	PROTOTYPE:
579	CODE:
580	while (nreqs)
581	{
582	poll_wait ();
583	poll_cb ();
584	}
585
586	void
587	poll()	952	poll()
588	PROTOTYPE:	953	PROTOTYPE:
589	CODE:	954	CODE:
590	if (nreqs)
591	{
592	poll_wait ();	955	poll_wait ();
593	poll_cb ();	956	RETVAL = poll_cb ();
594	}	957	OUTPUT:
		958	RETVAL
595		959
596	int	960	int
597	poll_fileno()	961	poll_fileno()
598	PROTOTYPE:	962	PROTOTYPE:
599	CODE:	963	CODE:
…		…
611		975
612	void	976	void
613	poll_wait()	977	poll_wait()
614	PROTOTYPE:	978	PROTOTYPE:
615	CODE:	979	CODE:
616	if (nreqs)
617	poll_wait ();	980	poll_wait ();
618		981
619	int	982	int
620	nreqs()	983	nreqs()
621	PROTOTYPE:	984	PROTOTYPE:
622	CODE:	985	CODE:
623	RETVAL = nreqs;	986	RETVAL = eio_nreqs ();
624	OUTPUT:	987	OUTPUT:
625	RETVAL	988	RETVAL
626		989
		990	int
		991	nready()
		992	PROTOTYPE:
		993	CODE:
		994	RETVAL = eio_nready ();
		995	OUTPUT:
		996	RETVAL
		997
		998	int
		999	npending()
		1000	PROTOTYPE:
		1001	CODE:
		1002	RETVAL = eio_npending ();
		1003	OUTPUT:
		1004	RETVAL
		1005
		1006	int
		1007	nthreads()
		1008	PROTOTYPE:
		1009	CODE:
		1010	RETVAL = eio_nthreads ();
		1011	OUTPUT:
		1012	RETVAL
		1013
		1014	void _on_next_submit (SV *cb)
		1015	CODE:
		1016	SvREFCNT_dec (on_next_submit);
		1017	on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
		1018
		1019	PROTOTYPES: DISABLE
		1020
		1021	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1022
		1023	void
		1024	cancel (aio_req_ornot req)
		1025	CODE:
		1026	eio_cancel (req);
		1027
		1028	void
		1029	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1030	CODE:
		1031	SvREFCNT_dec (req->callback);
		1032	req->callback = newSVsv (callback);
		1033
		1034	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1035
		1036	void
		1037	add (aio_req grp, ...)
		1038	PPCODE:
		1039	{
		1040	int i;
		1041
		1042	if (grp->int1 == 2)
		1043	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1044
		1045	for (i = 1; i < items; ++i )
		1046	{
		1047	aio_req req;
		1048
		1049	if (GIMME_V != G_VOID)
		1050	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1051
		1052	req = SvAIO_REQ (ST (i));
		1053
		1054	if (req)
		1055	eio_grp_add (grp, req);
		1056	}
		1057	}
		1058
		1059	void
		1060	cancel_subs (aio_req_ornot req)
		1061	CODE:
		1062	req_cancel_subs (req);
		1063
		1064	void
		1065	result (aio_req grp, ...)
		1066	CODE:
		1067	{
		1068	int i;
		1069	AV *av;
		1070
		1071	grp->errorno = errno;
		1072
		1073	av = newAV ();
		1074
		1075	for (i = 1; i < items; ++i )
		1076	av_push (av, newSVsv (ST (i)));
		1077
		1078	SvREFCNT_dec (grp->sv1);
		1079	grp->sv1 = (SV *)av;
		1080	}
		1081
		1082	void
		1083	errno (aio_req grp, int errorno = errno)
		1084	CODE:
		1085	grp->errorno = errorno;
		1086
		1087	void
		1088	limit (aio_req grp, int limit)
		1089	CODE:
		1090	eio_grp_limit (grp, limit);
		1091
		1092	void
		1093	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1094	CODE:
		1095	{
		1096	SvREFCNT_dec (grp->sv2);
		1097	grp->sv2 = newSVsv (callback);
		1098
		1099	if (grp->int2 <= 0)
		1100	grp->int2 = 2;
		1101
		1102	eio_grp_limit (grp, grp->int2);
		1103	}
		1104

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