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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.14 by root, Sat Jul 23 18:15:36 2005 UTC vs.
Revision 1.127 by root, Tue Sep 30 13:17:32 2008 UTC

		1	#include "libeio/xthread.h"
		2
		3	#include <errno.h>
		4
		5	#include "EXTERN.h"
1	#include "perl.h"	6	#include "perl.h"
2	#include "XSUB.h"	7	#include "XSUB.h"
3		8
		9	#include <stddef.h>
		10	#include <stdlib.h>
		11	#include <errno.h>
4	#include <sys/types.h>	12	#include <sys/types.h>
5	#include <sys/stat.h>	13	#include <sys/stat.h>
6
7	#include <unistd.h>	14	#include <limits.h>
8	#include <fcntl.h>	15	#include <fcntl.h>
9	#include <signal.h>
10	#include <sched.h>	16	#include <sched.h>
11	#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>
12	#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
13	#endif	68	#endif
14		69
15	#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
16		75
17	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	76	#define EIO_STRUCT_STAT Stat_t
18	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */
19	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
20		77
21	#if __ia64	78	/* use NV for 32 bit perls as it allows larger offsets */
22	# define STACKSIZE 65536	79	#if IVSIZE >= 8
		80	# define SvVAL64 SvIV
23	#else	81	#else
24	# define STACKSIZE 4096	82	# define SvVAL64 SvNV
25	#endif	83	#endif
26		84
		85	/*****************************************************************************/
		86
		87	#if __GNUC__ >= 3
		88	# define expect(expr,value) __builtin_expect ((expr),(value))
		89	#else
		90	# define expect(expr,value) (expr)
		91	#endif
		92
		93	#define expect_false(expr) expect ((expr) != 0, 0)
		94	#define expect_true(expr) expect ((expr) != 0, 1)
		95
		96	/*****************************************************************************/
		97
		98	static HV *stash;
		99	typedef SV SV8; /* byte-sv, used for argument-checking */
		100
		101	#define AIO_REQ_KLASS "IO::AIO::REQ"
		102	#define AIO_GRP_KLASS "IO::AIO::GRP"
		103
		104	#define EIO_REQ_MEMBERS \
		105	SV *callback; \
		106	SV *sv1, *sv2; \
		107	STRLEN stroffset; \
		108	SV *self;
		109
		110	#define EIO_NO_WRAPPERS 1
		111
		112	#include "libeio/eio.h"
		113
		114	static int req_invoke (eio_req *req);
		115	#define EIO_FINISH(req) req_invoke (req)
		116	static void aio_grp_feed (eio_req *grp);
		117	#define EIO_FEED(req) aio_grp_feed (req)
		118	static void req_destroy (eio_req *grp);
		119	#define EIO_DESTROY(req) req_destroy (req)
		120
27	enum {	121	enum {
28	REQ_QUIT,	122	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
29	REQ_OPEN, REQ_CLOSE,
30	REQ_READ, REQ_WRITE, REQ_READAHEAD,
31	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,
32	REQ_FSYNC, REQ_FDATASYNC,
33	};	123	};
34		124
35	typedef struct aio_cb {	125	#include "libeio/eio.c"
36	struct aio_cb *volatile next;
37		126
38	int type;
39
40	int fd;
41	off_t offset;
42	size_t length;
43	ssize_t result;
44	mode_t mode; /* open */
45	int errorno;
46	SV *data, *callback, *fh;
47	void *dataptr;
48	STRLEN dataoffset;
49
50	Stat_t *statdata;
51	} aio_cb;
52
53	typedef aio_cb *aio_req;	127	typedef eio_req *aio_req;
		128	typedef eio_req *aio_req_ornot;
54		129
55	static int started;	130	static SV *on_next_submit;
56	static volatile int nreqs;	131	static int next_pri = EIO_PRI_DEFAULT;
57	static int max_outstanding = 1<<30;	132	static int max_outstanding;
58	static int respipe [2];
59		133
60	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	134	static int respipe_osf [2], respipe [2] = { -1, -1 };
61	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
62	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
63		135
64	static volatile aio_req reqs, reqe; /* queue start, queue end */	136	static void req_destroy (aio_req req);
65	static volatile aio_req ress, rese; /* queue start, queue end */	137	static void req_cancel (aio_req req);
66		138
67	static void	139	static void want_poll (void)
68	poll_wait ()
69	{	140	{
70	if (nreqs && !ress)	141	/* write a dummy byte to the pipe so fh becomes ready */
		142	respipe_write (respipe_osf [1], (const void *)&respipe_osf, 1);
		143	}
		144
		145	static void done_poll (void)
		146	{
		147	/* read any signals sent by the worker threads */
		148	char buf [4];
		149	while (respipe_read (respipe [0], buf, 4) == 4)
		150	;
		151	}
		152
		153	/* must be called at most once */
		154	static SV *req_sv (aio_req req, const char *klass)
		155	{
		156	if (!req->self)
71	{	157	{
72	fd_set rfd;	158	req->self = (SV *)newHV ();
73	FD_ZERO(&rfd);	159	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
74	FD_SET(respipe [0], &rfd);
75
76	select (respipe [0] + 1, &rfd, 0, 0, 0);
77	}	160	}
78	}
79		161
80	static int	162	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
81	poll_cb ()	163	}
		164
		165	static aio_req SvAIO_REQ (SV *sv)
		166	{
		167	MAGIC *mg;
		168
		169	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		170	croak ("object of class " AIO_REQ_KLASS " expected");
		171
		172	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		173
		174	return mg ? (aio_req)mg->mg_ptr : 0;
		175	}
		176
		177	static void aio_grp_feed (aio_req grp)
		178	{
		179	if (grp->sv2 && SvOK (grp->sv2))
		180	{
		181	dSP;
		182
		183	ENTER;
		184	SAVETMPS;
		185	PUSHMARK (SP);
		186	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		187	PUTBACK;
		188	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		189	SPAGAIN;
		190	FREETMPS;
		191	LEAVE;
		192	}
		193	}
		194
		195	static void req_submit (eio_req *req)
		196	{
		197	eio_submit (req);
		198
		199	if (expect_false (on_next_submit))
		200	{
		201	dSP;
		202	SV *cb = sv_2mortal (on_next_submit);
		203
		204	on_next_submit = 0;
		205
		206	PUSHMARK (SP);
		207	PUTBACK;
		208	call_sv (cb, G_DISCARD | G_EVAL);
		209	}
		210	}
		211
		212	static int req_invoke (eio_req *req)
82	{	213	{
83	dSP;	214	dSP;
84	int count = 0;
85	aio_req req, prv;
86		215
87	pthread_mutex_lock (&reslock);	216	if (req->flags & FLAG_SV2_RO_OFF)
		217	SvREADONLY_off (req->sv2);
88		218
89	{	219	if (!EIO_CANCELLED (req) && SvOK (req->callback))
90	/* read any signals sent by the worker threads */
91	char buf [32];
92	while (read (respipe [0], buf, 32) > 0)
93	;
94	}
95
96	req = ress;
97	ress = rese = 0;
98
99	pthread_mutex_unlock (&reslock);
100
101	while (req)
102	{	220	{
103	nreqs--;	221	ENTER;
		222	SAVETMPS;
		223	PUSHMARK (SP);
		224	EXTEND (SP, 1);
104		225
105	if (req->type == REQ_QUIT)	226	switch (req->type)
106	started--;
107	else
108	{	227	{
109	int errorno = errno;	228	case EIO_READDIR:
110	errno = req->errorno;
111
112	if (req->type == REQ_READ)
113	SvCUR_set (req->data, req->dataoffset
114	+ req->result > 0 ? req->result : 0);
115
116	if (req->data)
117	SvREFCNT_dec (req->data);
118
119	if (req->fh)
120	SvREFCNT_dec (req->fh);
121
122	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
123	{	229	{
124	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	230	SV *rv = &PL_sv_undef;
125	PL_laststatval = req->result;
126	PL_statcache = *(req->statdata);
127		231
128	Safefree (req->statdata);	232	if (req->result >= 0)
		233	{
		234	int i;
		235	char *buf = req->ptr2;
		236	AV *av = newAV ();
		237
		238	av_extend (av, req->result - 1);
		239
		240	for (i = 0; i < req->result; ++i)
		241	{
		242	SV *sv = newSVpv (buf, 0);
		243
		244	av_store (av, i, sv);
		245	buf += SvCUR (sv) + 1;
		246	}
		247
		248	rv = sv_2mortal (newRV_noinc ((SV *)av));
		249	}
		250
		251	PUSHs (rv);
129	}	252	}
		253	break;
130		254
131	ENTER;	255	case EIO_OPEN:
132	PUSHMARK (SP);
133	XPUSHs (sv_2mortal (newSViv (req->result)));
134
135	if (req->type == REQ_OPEN)
136	{	256	{
137	/* convert fd to fh */	257	/* convert fd to fh */
138	SV *fh;	258	SV *fh = &PL_sv_undef;
139		259
140	PUTBACK;	260	if (req->result >= 0)
141	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	261	{
142	SPAGAIN;	262	GV *gv = (GV *)sv_newmortal ();
		263	int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
		264	char sym [64];
		265	int symlen;
		266
		267	symlen = snprintf (sym, sizeof (sym), "fd#%d", req->result);
		268	gv_init (gv, stash, sym, symlen, 0);
143		269
144	fh = SvREFCNT_inc (POPs);	270	symlen = snprintf (
		271	sym,
		272	sizeof (sym),
		273	"%s&=%d",
		274	flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
		275	req->result
		276	);
145		277
		278	if (do_open (gv, sym, symlen, 0, 0, 0, 0))
		279	fh = (SV *)gv;
		280	}
		281
146	PUSHMARK (SP);	282	PUSHs (fh);
147	XPUSHs (sv_2mortal (fh));
148	}	283	}
149
150	if (SvOK (req->callback))
151	{
152	PUTBACK;
153	call_sv (req->callback, G_VOID | G_EVAL);
154	SPAGAIN;
155	}
156
157	LEAVE;
158
159	if (req->callback)
160	SvREFCNT_dec (req->callback);
161
162	errno = errorno;
163	count++;
164	}
165
166	prv = req;
167	req = req->next;
168	Safefree (prv);
169
170	/* TODO: croak on errors? */
171	}
172
173	return count;
174	}
175
176	static void *aio_proc(void *arg);
177
178	static void
179	start_thread (void)
180	{
181	sigset_t fullsigset, oldsigset;
182	pthread_t tid;
183	pthread_attr_t attr;
184
185	pthread_attr_init (&attr);
186	pthread_attr_setstacksize (&attr, STACKSIZE);
187	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
188
189	sigfillset (&fullsigset);
190	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
191
192	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
193	started++;
194
195	sigprocmask (SIG_SETMASK, &oldsigset, 0);
196	}
197
198	static void
199	send_req (aio_req req)
200	{
201	nreqs++;
202
203	pthread_mutex_lock (&reqlock);
204
205	req->next = 0;
206
207	if (reqe)
208	{
209	reqe->next = req;
210	reqe = req;
211	}
212	else
213	reqe = reqs = req;
214
215	pthread_cond_signal (&reqwait);
216	pthread_mutex_unlock (&reqlock);
217
218	while (nreqs > max_outstanding)
219	{
220	poll_wait ();
221	poll_cb ();
222	}
223	}
224
225	static void
226	end_thread (void)
227	{
228	aio_req req;
229	New (0, req, 1, aio_cb);
230	req->type = REQ_QUIT;
231
232	send_req (req);
233	}
234
235	static void *
236	aio_proc (void *thr_arg)
237	{
238	aio_req req;
239	int type;
240
241	do
242	{
243	pthread_mutex_lock (&reqlock);
244
245	for (;;)
246	{
247	req = reqs;
248
249	if (reqs)
250	{
251	reqs = reqs->next;
252	if (!reqs) reqe = 0;
253	}
254
255	if (req)
256	break;	284	break;
257		285
258	pthread_cond_wait (&reqwait, &reqlock);	286	case EIO_GROUP:
259	}	287	req->int1 = 2; /* mark group as finished */
260		288
261	pthread_mutex_unlock (&reqlock);	289	if (req->sv1)
262
263	errno = 0; /* strictly unnecessary */
264
265	type = req->type;
266
267	switch (type)
268	{	290	{
269	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	291	int i;
270	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	292	AV *av = (AV *)req->sv1;
271	#if SYS_readahead
272	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
273	#else
274	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
275	#endif
276		293
277	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	294	EXTEND (SP, AvFILL (av) + 1);
278	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	295	for (i = 0; i <= AvFILL (av); ++i)
279	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	296	PUSHs (*av_fetch (av, i, 0));
280		297	}
281	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
282	case REQ_CLOSE: req->result = close (req->fd); break;
283	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
284
285	case REQ_FSYNC: req->result = fsync (req->fd); break;
286	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
287
288	case REQ_QUIT:
289	break;	298	break;
290		299
		300	case EIO_NOP:
		301	case EIO_BUSY:
		302	break;
		303
		304	case EIO_READLINK:
		305	if (req->result > 0)
		306	PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
		307	break;
		308
		309	case EIO_STAT:
		310	case EIO_LSTAT:
		311	case EIO_FSTAT:
		312	PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
		313	PL_laststatval = req->result;
		314	PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
		315	PUSHs (sv_2mortal (newSViv (req->result)));
		316	break;
		317
		318	case EIO_READ:
		319	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		320	*SvEND (req->sv2) = 0;
		321	PUSHs (sv_2mortal (newSViv (req->result)));
		322	break;
		323
		324	case EIO_DUP2:
		325	if (req->result > 0)
		326	req->result = 0;
		327	/* FALLTHROUGH */
		328
291	default:	329	default:
292	req->result = ENOSYS;	330	PUSHs (sv_2mortal (newSViv (req->result)));
293	break;	331	break;
294	}	332	}
295		333
296	req->errorno = errno;	334	errno = req->errorno;
297		335
298	pthread_mutex_lock (&reslock);	336	PUTBACK;
		337	call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
		338	SPAGAIN;
299		339
300	req->next = 0;	340	FREETMPS;
		341	LEAVE;
301		342
302	if (rese)	343	PUTBACK;
303	{
304	rese->next = req;
305	rese = req;
306	}
307	else
308	{
309	rese = ress = req;
310
311	/* write a dummy byte to the pipe so fh becomes ready */
312	write (respipe [1], &respipe, 1);
313	}
314
315	pthread_mutex_unlock (&reslock);
316	}	344	}
317	while (type != REQ_QUIT);
318		345
		346	return !!SvTRUE (ERRSV);
		347	}
		348
		349	static void req_destroy (aio_req req)
		350	{
		351	if (req->self)
		352	{
		353	sv_unmagic (req->self, PERL_MAGIC_ext);
		354	SvREFCNT_dec (req->self);
		355	}
		356
		357	SvREFCNT_dec (req->sv1);
		358	SvREFCNT_dec (req->sv2);
		359	SvREFCNT_dec (req->callback);
		360
		361	Safefree (req);
		362	}
		363
		364	static void req_cancel_subs (aio_req grp)
		365	{
		366	aio_req sub;
		367
		368	if (grp->type != EIO_GROUP)
319	return 0;	369	return;
320	}
321		370
		371	SvREFCNT_dec (grp->sv2);
		372	grp->sv2 = 0;
		373
		374	eio_grp_cancel (grp);
		375	}
		376
		377	#ifdef USE_SOCKETS_AS_HANDLES
		378	# define TO_SOCKET(x) (win32_get_osfhandle (x))
		379	#else
		380	# define TO_SOCKET(x) (x)
		381	#endif
		382
		383	static void
		384	create_respipe (void)
		385	{
		386	int old_readfd = respipe [0];
		387
		388	if (respipe [1] >= 0)
		389	respipe_close (TO_SOCKET (respipe [1]));
		390
		391	#ifdef _WIN32
		392	if (PerlSock_socketpair (AF_UNIX, SOCK_STREAM, 0, respipe))
		393	#else
		394	if (pipe (respipe))
		395	#endif
		396	croak ("unable to initialize result pipe");
		397
		398	if (old_readfd >= 0)
		399	{
		400	if (dup2 (TO_SOCKET (respipe [0]), TO_SOCKET (old_readfd)) < 0)
		401	croak ("unable to initialize result pipe(2)");
		402
		403	respipe_close (respipe [0]);
		404	respipe [0] = old_readfd;
		405	}
		406
		407	#ifdef _WIN32
		408	int arg = 1;
		409	if (ioctlsocket (TO_SOCKET (respipe [0]), FIONBIO, &arg)
		410	|| ioctlsocket (TO_SOCKET (respipe [1]), FIONBIO, &arg))
		411	#else
		412	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)
		413	|| fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		414	#endif
		415	croak ("unable to initialize result pipe(3)");
		416
		417	respipe_osf [0] = TO_SOCKET (respipe [0]);
		418	respipe_osf [1] = TO_SOCKET (respipe [1]);
		419	}
		420
		421	static void poll_wait (void)
		422	{
		423	fd_set rfd;
		424
		425	while (eio_nreqs ())
		426	{
		427	int size;
		428
		429	X_LOCK (reslock);
		430	size = res_queue.size;
		431	X_UNLOCK (reslock);
		432
		433	if (size)
		434	return;
		435
		436	etp_maybe_start_thread ();
		437
		438	FD_ZERO (&rfd);
		439	FD_SET (respipe [0], &rfd);
		440
		441	PerlSock_select (respipe [0] + 1, &rfd, 0, 0, 0);
		442	}
		443	}
		444
		445	static int poll_cb (void)
		446	{
		447	for (;;)
		448	{
		449	int res = eio_poll ();
		450
		451	if (res > 0)
		452	croak (0);
		453
		454	if (!max_outstanding || max_outstanding > eio_nreqs ())
		455	return res;
		456
		457	poll_wait ();
		458	}
		459	}
		460
		461	static void atfork_child (void)
		462	{
		463	create_respipe ();
		464	}
		465
		466	#define dREQ \
		467	aio_req req; \
		468	int req_pri = next_pri; \
		469	next_pri = EIO_PRI_DEFAULT; \
		470	\
		471	if (SvOK (callback) && !SvROK (callback)) \
		472	croak ("callback must be undef or of reference type"); \
		473	\
		474	Newz (0, req, 1, eio_req); \
		475	if (!req) \
		476	croak ("out of memory during eio_req allocation"); \
		477	\
		478	req->callback = newSVsv (callback); \
		479	req->pri = req_pri
		480
		481	#define REQ_SEND \
		482	PUTBACK; \
		483	req_submit (req); \
		484	SPAGAIN; \
		485	\
		486	if (GIMME_V != G_VOID) \
		487	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		488
322	MODULE = IO::AIO PACKAGE = IO::AIO	489	MODULE = IO::AIO PACKAGE = IO::AIO
323		490
324	PROTOTYPES: ENABLE	491	PROTOTYPES: ENABLE
325		492
326	BOOT:	493	BOOT:
327	{	494	{
328	if (pipe (respipe))	495	stash = gv_stashpv ("IO::AIO", 1);
329	croak ("unable to initialize result pipe");
330		496
331	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	497	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
332	croak ("cannot set result pipe to nonblocking mode");	498	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		499	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		500	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		501	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		502	#ifndef _WIN32
		503	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		504	#endif
333		505
334	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	506	create_respipe ();
335	croak ("cannot set result pipe to nonblocking mode");
336	}
337		507
		508	if (eio_init (want_poll, done_poll) < 0)
		509	croak ("IO::AIO: unable to initialise eio library");
		510
		511	/* atfork child called in fifo order, so before eio's handler */
		512	X_THREAD_ATFORK (0, 0, atfork_child);
		513	}
		514
338	void	515	void
339	min_parallel(nthreads)	516	max_poll_reqs (int nreqs)
340	int nthreads
341	PROTOTYPE: $	517	PROTOTYPE: $
342	CODE:	518	CODE:
343	while (nthreads > started)	519	eio_set_max_poll_reqs (nreqs);
344	start_thread ();
345		520
346	void	521	void
347	max_parallel(nthreads)	522	max_poll_time (double nseconds)
348	int nthreads
349	PROTOTYPE: $	523	PROTOTYPE: $
350	CODE:	524	CODE:
		525	eio_set_max_poll_time (nseconds);
		526
		527	void
		528	min_parallel (int nthreads)
		529	PROTOTYPE: $
		530	CODE:
		531	eio_set_min_parallel (nthreads);
		532
		533	void
		534	max_parallel (int nthreads)
		535	PROTOTYPE: $
		536	CODE:
		537	eio_set_max_parallel (nthreads);
		538
		539	void
		540	max_idle (int nthreads)
		541	PROTOTYPE: $
		542	CODE:
		543	eio_set_max_idle (nthreads);
		544
		545	void
		546	max_outstanding (int maxreqs)
		547	PROTOTYPE: $
		548	CODE:
		549	max_outstanding = maxreqs;
		550
		551	void
		552	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
		553	PROTOTYPE: $$$;$
		554	PPCODE:
351	{	555	{
352	int cur = started;	556	dREQ;
353	while (cur > nthreads)	557
354	{	558	req->type = EIO_OPEN;
355	end_thread ();	559	req->sv1 = newSVsv (pathname);
		560	req->ptr1 = SvPVbyte_nolen (req->sv1);
		561	req->int1 = flags;
		562	req->int2 = mode;
		563
		564	REQ_SEND;
		565	}
		566
		567	void
		568	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
		569	PROTOTYPE: $;$
		570	ALIAS:
		571	aio_fsync = EIO_FSYNC
		572	aio_fdatasync = EIO_FDATASYNC
		573	PPCODE:
		574	{
		575	dREQ;
		576
		577	req->type = ix;
		578	req->sv1 = newSVsv (fh);
		579	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		580
		581	REQ_SEND (req);
		582	}
		583
		584	void
		585	aio_close (SV *fh, SV *callback=&PL_sv_undef)
		586	PROTOTYPE: $;$
		587	PPCODE:
		588	{
		589	static int close_pipe = -1; /* dummy fd to close fds via dup2 */
		590	dREQ;
		591
		592	if (close_pipe < 0)
		593	{
		594	int pipefd [2];
		595
		596	if (pipe (pipefd) < 0
		597	|| close (pipefd [1]) < 0
		598	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
		599	abort (); /*D*/
		600
		601	close_pipe = pipefd [0];
		602	}
		603
		604	req->type = EIO_DUP2;
		605	req->int1 = close_pipe;
		606	req->sv2 = newSVsv (fh);
		607	req->int2 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		608
		609	REQ_SEND (req);
		610	}
		611
		612	void
		613	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
		614	ALIAS:
		615	aio_read = EIO_READ
		616	aio_write = EIO_WRITE
		617	PROTOTYPE: $$$$$;$
		618	PPCODE:
		619	{
		620	STRLEN svlen;
		621	char *svptr = SvPVbyte (data, svlen);
		622	UV len = SvUV (length);
		623
		624	SvUPGRADE (data, SVt_PV);
		625	SvPOK_on (data);
		626
		627	if (dataoffset < 0)
		628	dataoffset += svlen;
		629
		630	if (dataoffset < 0 || dataoffset > svlen)
		631	croak ("dataoffset outside of data scalar");
		632
		633	if (ix == EIO_WRITE)
		634	{
		635	/* write: check length and adjust. */
		636	if (!SvOK (length) || len + dataoffset > svlen)
		637	len = svlen - dataoffset;
		638	}
		639	else
		640	{
		641	/* read: grow scalar as necessary */
		642	svptr = SvGROW (data, len + dataoffset + 1);
		643	}
		644
		645	if (len < 0)
		646	croak ("length must not be negative");
		647
		648	{
		649	dREQ;
		650
		651	req->type = ix;
		652	req->sv1 = newSVsv (fh);
		653	req->int1 = PerlIO_fileno (ix == EIO_READ ? IoIFP (sv_2io (fh))
		654	: IoOFP (sv_2io (fh)));
		655	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		656	req->size = len;
		657	req->sv2 = SvREFCNT_inc (data);
		658	req->ptr2 = (char *)svptr + dataoffset;
		659	req->stroffset = dataoffset;
		660
		661	if (!SvREADONLY (data))
356	cur--;	662	{
		663	SvREADONLY_on (data);
		664	req->flags |= FLAG_SV2_RO_OFF;
357	}	665	}
358		666
359	while (started > nthreads)	667	REQ_SEND;
		668	}
		669	}
		670
		671	void
		672	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		673	PROTOTYPE: $$;$
		674	PPCODE:
		675	{
		676	SV *data;
		677	dREQ;
		678
		679	req->type = EIO_READLINK;
		680	req->sv1 = newSVsv (path);
		681	req->ptr1 = SvPVbyte_nolen (req->sv1);
		682
		683	REQ_SEND;
		684	}
		685
		686	void
		687	aio_sendfile (SV *out_fh, SV *in_fh, SV *in_offset, UV length, SV *callback=&PL_sv_undef)
		688	PROTOTYPE: $$$$;$
		689	PPCODE:
		690	{
		691	dREQ;
		692
		693	req->type = EIO_SENDFILE;
		694	req->sv1 = newSVsv (out_fh);
		695	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		696	req->sv2 = newSVsv (in_fh);
		697	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		698	req->offs = SvVAL64 (in_offset);
		699	req->size = length;
		700
		701	REQ_SEND;
		702	}
		703
		704	void
		705	aio_readahead (SV *fh, SV *offset, IV length, SV *callback=&PL_sv_undef)
		706	PROTOTYPE: $$$;$
		707	PPCODE:
		708	{
		709	dREQ;
		710
		711	req->type = EIO_READAHEAD;
		712	req->sv1 = newSVsv (fh);
		713	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		714	req->offs = SvVAL64 (offset);
		715	req->size = length;
		716
		717	REQ_SEND;
		718	}
		719
		720	void
		721	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
		722	ALIAS:
		723	aio_stat = EIO_STAT
		724	aio_lstat = EIO_LSTAT
		725	PPCODE:
		726	{
		727	dREQ;
		728
		729	req->sv1 = newSVsv (fh_or_path);
		730
		731	if (SvPOK (req->sv1))
		732	{
		733	req->type = ix;
		734	req->ptr1 = SvPVbyte_nolen (req->sv1);
		735	}
		736	else
		737	{
		738	req->type = EIO_FSTAT;
		739	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		740	}
		741
		742	REQ_SEND;
		743	}
		744
		745	void
		746	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		747	PPCODE:
		748	{
		749	dREQ;
		750
		751	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		752	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		753	req->sv1 = newSVsv (fh_or_path);
		754
		755	if (SvPOK (req->sv1))
		756	{
		757	req->type = EIO_UTIME;
		758	req->ptr1 = SvPVbyte_nolen (req->sv1);
		759	}
		760	else
		761	{
		762	req->type = EIO_FUTIME;
		763	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		764	}
		765
		766	REQ_SEND;
		767	}
		768
		769	void
		770	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		771	PPCODE:
		772	{
		773	dREQ;
		774
		775	req->sv1 = newSVsv (fh_or_path);
		776	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		777
		778	if (SvPOK (req->sv1))
		779	{
		780	req->type = EIO_TRUNCATE;
		781	req->ptr1 = SvPVbyte_nolen (req->sv1);
		782	}
		783	else
		784	{
		785	req->type = EIO_FTRUNCATE;
		786	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		787	}
		788
		789	REQ_SEND;
		790	}
		791
		792	void
		793	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		794	ALIAS:
		795	aio_chmod = EIO_CHMOD
		796	aio_mkdir = EIO_MKDIR
		797	PPCODE:
		798	{
		799	dREQ;
		800
		801	req->int2 = mode;
		802	req->sv1 = newSVsv (fh_or_path);
		803
		804	if (SvPOK (req->sv1))
		805	{
		806	req->type = ix;
		807	req->ptr1 = SvPVbyte_nolen (req->sv1);
		808	}
		809	else
		810	{
		811	req->type = EIO_FCHMOD;
		812	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		813	}
		814
		815	REQ_SEND;
		816	}
		817
		818	void
		819	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		820	PPCODE:
		821	{
		822	dREQ;
		823
		824	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		825	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		826	req->sv1 = newSVsv (fh_or_path);
		827
		828	if (SvPOK (req->sv1))
		829	{
		830	req->type = EIO_CHOWN;
		831	req->ptr1 = SvPVbyte_nolen (req->sv1);
		832	}
		833	else
		834	{
		835	req->type = EIO_FCHOWN;
		836	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		837	}
		838
		839	REQ_SEND;
		840	}
		841
		842	void
		843	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
		844	ALIAS:
		845	aio_unlink = EIO_UNLINK
		846	aio_rmdir = EIO_RMDIR
		847	aio_readdir = EIO_READDIR
		848	PPCODE:
		849	{
		850	dREQ;
		851
		852	req->type = ix;
		853	req->sv1 = newSVsv (pathname);
		854	req->ptr1 = SvPVbyte_nolen (req->sv1);
		855
		856	REQ_SEND;
		857	}
		858
		859	void
		860	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
		861	ALIAS:
		862	aio_link = EIO_LINK
		863	aio_symlink = EIO_SYMLINK
		864	aio_rename = EIO_RENAME
		865	PPCODE:
		866	{
		867	dREQ;
		868
		869	req->type = ix;
		870	req->sv1 = newSVsv (oldpath);
		871	req->ptr1 = SvPVbyte_nolen (req->sv1);
		872	req->sv2 = newSVsv (newpath);
		873	req->ptr2 = SvPVbyte_nolen (req->sv2);
		874
		875	REQ_SEND;
		876	}
		877
		878	void
		879	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
		880	PPCODE:
		881	{
		882	dREQ;
		883
		884	req->type = EIO_MKNOD;
		885	req->sv1 = newSVsv (pathname);
		886	req->ptr1 = SvPVbyte_nolen (req->sv1);
		887	req->int2 = (mode_t)mode;
		888	req->offs = dev;
		889
		890	REQ_SEND;
		891	}
		892
		893	void
		894	aio_busy (double delay, SV *callback=&PL_sv_undef)
		895	PPCODE:
		896	{
		897	dREQ;
		898
		899	req->type = EIO_BUSY;
		900	req->nv1 = delay < 0. ? 0. : delay;
		901
		902	REQ_SEND;
		903	}
		904
		905	void
		906	aio_group (SV *callback=&PL_sv_undef)
		907	PROTOTYPE: ;$
		908	PPCODE:
		909	{
		910	dREQ;
		911
		912	req->type = EIO_GROUP;
		913
		914	req_submit (req);
		915	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		916	}
		917
		918	void
		919	aio_nop (SV *callback=&PL_sv_undef)
		920	ALIAS:
		921	aio_nop = EIO_NOP
		922	aio_sync = EIO_SYNC
		923	PPCODE:
		924	{
		925	dREQ;
		926
		927	req->type = ix;
		928
		929	REQ_SEND;
		930	}
		931
		932	int
		933	aioreq_pri (int pri = 0)
		934	PROTOTYPE: ;$
		935	CODE:
		936	RETVAL = next_pri;
		937	if (items > 0)
		938	{
		939	if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
		940	if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
		941	next_pri = pri;
		942	}
		943	OUTPUT:
		944	RETVAL
		945
		946	void
		947	aioreq_nice (int nice = 0)
		948	CODE:
		949	nice = next_pri - nice;
		950	if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
		951	if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
		952	next_pri = nice;
		953
		954	void
		955	flush ()
		956	PROTOTYPE:
		957	CODE:
		958	while (eio_nreqs ())
360	{	959	{
361	poll_wait ();	960	poll_wait ();
362	poll_cb ();	961	poll_cb ();
363	}	962	}
364	}
365		963
366	int	964	int
367	max_outstanding(nreqs)
368	int nreqs
369	PROTOTYPE: $
370	CODE:
371	RETVAL = max_outstanding;
372	max_outstanding = nreqs;
373
374	void
375	aio_open(pathname,flags,mode,callback=&PL_sv_undef)
376	SV * pathname
377	int flags
378	int mode
379	SV * callback
380	PROTOTYPE: $$$;$
381	CODE:
382	{
383	aio_req req;
384
385	Newz (0, req, 1, aio_cb);
386
387	if (!req)
388	croak ("out of memory during aio_req allocation");
389
390	req->type = REQ_OPEN;
391	req->data = newSVsv (pathname);
392	req->dataptr = SvPV_nolen (req->data);
393	req->fd = flags;
394	req->mode = mode;
395	req->callback = SvREFCNT_inc (callback);
396
397	send_req (req);
398	}
399
400	void
401	aio_close(fh,callback=&PL_sv_undef)
402	SV * fh
403	SV * callback
404	PROTOTYPE: $;$
405	ALIAS:
406	aio_close = REQ_CLOSE
407	aio_fsync = REQ_FSYNC
408	aio_fdatasync = REQ_FDATASYNC
409	CODE:
410	{
411	aio_req req;
412
413	Newz (0, req, 1, aio_cb);
414
415	if (!req)
416	croak ("out of memory during aio_req allocation");
417
418	req->type = ix;
419	req->fh = newSVsv (fh);
420	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
421	req->callback = SvREFCNT_inc (callback);
422
423	send_req (req);
424	}
425
426	void
427	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
428	SV * fh
429	UV offset
430	IV length
431	SV * data
432	IV dataoffset
433	SV * callback
434	ALIAS:
435	aio_read = REQ_READ
436	aio_write = REQ_WRITE
437	PROTOTYPE: $$$$$;$
438	CODE:
439	{
440	aio_req req;
441	STRLEN svlen;
442	char *svptr = SvPV (data, svlen);
443
444	SvUPGRADE (data, SVt_PV);
445	SvPOK_on (data);
446
447	if (dataoffset < 0)
448	dataoffset += svlen;
449
450	if (dataoffset < 0 || dataoffset > svlen)
451	croak ("data offset outside of string");
452
453	if (ix == REQ_WRITE)
454	{
455	/* write: check length and adjust. */
456	if (length < 0 || length + dataoffset > svlen)
457	length = svlen - dataoffset;
458	}
459	else
460	{
461	/* read: grow scalar as necessary */
462	svptr = SvGROW (data, length + dataoffset);
463	}
464
465	if (length < 0)
466	croak ("length must not be negative");
467
468	Newz (0, req, 1, aio_cb);
469
470	if (!req)
471	croak ("out of memory during aio_req allocation");
472
473	req->type = ix;
474	req->fh = newSVsv (fh);
475	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
476	: IoOFP (sv_2io (fh)));
477	req->offset = offset;
478	req->length = length;
479	req->data = SvREFCNT_inc (data);
480	req->dataptr = (char *)svptr + dataoffset;
481	req->callback = SvREFCNT_inc (callback);
482
483	send_req (req);
484	}
485
486	void
487	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
488	SV * fh
489	UV offset
490	IV length
491	SV * callback
492	PROTOTYPE: $$$;$
493	CODE:
494	{
495	aio_req req;
496
497	if (length < 0)
498	croak ("length must not be negative");
499
500	Newz (0, req, 1, aio_cb);
501
502	if (!req)
503	croak ("out of memory during aio_req allocation");
504
505	req->type = REQ_READAHEAD;
506	req->fh = newSVsv (fh);
507	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
508	req->offset = offset;
509	req->length = length;
510	req->callback = SvREFCNT_inc (callback);
511
512	send_req (req);
513	}
514
515	void
516	aio_stat(fh_or_path,callback=&PL_sv_undef)
517	SV * fh_or_path
518	SV * callback
519	ALIAS:
520	aio_stat = REQ_STAT
521	aio_lstat = REQ_LSTAT
522	CODE:
523	{
524	aio_req req;
525
526	Newz (0, req, 1, aio_cb);
527
528	if (!req)
529	croak ("out of memory during aio_req allocation");
530
531	New (0, req->statdata, 1, Stat_t);
532
533	if (!req->statdata)
534	croak ("out of memory during aio_req->statdata allocation");
535
536	if (SvPOK (fh_or_path))
537	{
538	req->type = ix;
539	req->data = newSVsv (fh_or_path);
540	req->dataptr = SvPV_nolen (req->data);
541	}
542	else
543	{
544	req->type = REQ_FSTAT;
545	req->fh = newSVsv (fh_or_path);
546	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
547	}
548
549	req->callback = SvREFCNT_inc (callback);
550
551	send_req (req);
552	}
553
554	void
555	aio_unlink(pathname,callback=&PL_sv_undef)
556	SV * pathname
557	SV * callback
558	CODE:
559	{
560	aio_req req;
561
562	Newz (0, req, 1, aio_cb);
563
564	if (!req)
565	croak ("out of memory during aio_req allocation");
566
567	req->type = REQ_UNLINK;
568	req->data = newSVsv (pathname);
569	req->dataptr = SvPV_nolen (req->data);
570	req->callback = SvREFCNT_inc (callback);
571
572	send_req (req);
573	}
574
575	void
576	flush()
577	PROTOTYPE:
578	CODE:
579	while (nreqs)
580	{
581	poll_wait ();
582	poll_cb ();
583	}
584
585	void
586	poll()	965	poll()
587	PROTOTYPE:	966	PROTOTYPE:
588	CODE:	967	CODE:
589	if (nreqs)
590	{
591	poll_wait ();	968	poll_wait ();
592	poll_cb ();	969	RETVAL = poll_cb ();
593	}	970	OUTPUT:
		971	RETVAL
594		972
595	int	973	int
596	poll_fileno()	974	poll_fileno()
597	PROTOTYPE:	975	PROTOTYPE:
598	CODE:	976	CODE:
…		…
610		988
611	void	989	void
612	poll_wait()	990	poll_wait()
613	PROTOTYPE:	991	PROTOTYPE:
614	CODE:	992	CODE:
615	if (nreqs)
616	poll_wait ();	993	poll_wait ();
617		994
618	int	995	int
619	nreqs()	996	nreqs()
620	PROTOTYPE:	997	PROTOTYPE:
621	CODE:	998	CODE:
622	RETVAL = nreqs;	999	RETVAL = eio_nreqs ();
623	OUTPUT:	1000	OUTPUT:
624	RETVAL	1001	RETVAL
625		1002
		1003	int
		1004	nready()
		1005	PROTOTYPE:
		1006	CODE:
		1007	RETVAL = eio_nready ();
		1008	OUTPUT:
		1009	RETVAL
		1010
		1011	int
		1012	npending()
		1013	PROTOTYPE:
		1014	CODE:
		1015	RETVAL = eio_npending ();
		1016	OUTPUT:
		1017	RETVAL
		1018
		1019	int
		1020	nthreads()
		1021	PROTOTYPE:
		1022	CODE:
		1023	RETVAL = eio_nthreads ();
		1024	OUTPUT:
		1025	RETVAL
		1026
		1027	void _on_next_submit (SV *cb)
		1028	CODE:
		1029	SvREFCNT_dec (on_next_submit);
		1030	on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
		1031
		1032	PROTOTYPES: DISABLE
		1033
		1034	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1035
		1036	void
		1037	cancel (aio_req_ornot req)
		1038	CODE:
		1039	eio_cancel (req);
		1040
		1041	void
		1042	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1043	CODE:
		1044	SvREFCNT_dec (req->callback);
		1045	req->callback = newSVsv (callback);
		1046
		1047	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1048
		1049	void
		1050	add (aio_req grp, ...)
		1051	PPCODE:
		1052	{
		1053	int i;
		1054
		1055	if (grp->int1 == 2)
		1056	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1057
		1058	for (i = 1; i < items; ++i )
		1059	{
		1060	aio_req req;
		1061
		1062	if (GIMME_V != G_VOID)
		1063	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1064
		1065	req = SvAIO_REQ (ST (i));
		1066
		1067	if (req)
		1068	eio_grp_add (grp, req);
		1069	}
		1070	}
		1071
		1072	void
		1073	cancel_subs (aio_req_ornot req)
		1074	CODE:
		1075	req_cancel_subs (req);
		1076
		1077	void
		1078	result (aio_req grp, ...)
		1079	CODE:
		1080	{
		1081	int i;
		1082	AV *av;
		1083
		1084	grp->errorno = errno;
		1085
		1086	av = newAV ();
		1087
		1088	for (i = 1; i < items; ++i )
		1089	av_push (av, newSVsv (ST (i)));
		1090
		1091	SvREFCNT_dec (grp->sv1);
		1092	grp->sv1 = (SV *)av;
		1093	}
		1094
		1095	void
		1096	errno (aio_req grp, int errorno = errno)
		1097	CODE:
		1098	grp->errorno = errorno;
		1099
		1100	void
		1101	limit (aio_req grp, int limit)
		1102	CODE:
		1103	eio_grp_limit (grp, limit);
		1104
		1105	void
		1106	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1107	CODE:
		1108	{
		1109	SvREFCNT_dec (grp->sv2);
		1110	grp->sv2 = newSVsv (callback);
		1111
		1112	if (grp->int2 <= 0)
		1113	grp->int2 = 2;
		1114
		1115	eio_grp_limit (grp, grp->int2);
		1116	}
		1117

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