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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 1.116 by root, Sat May 10 19:25:33 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	#ifdef _WIN32
		19
		20	# define EIO_STRUCT_DIRENT Direntry_t
		21	# undef malloc
		22	# undef free
		23
		24	// perl overrides all those nice win32 functions
		25	# undef open
		26	# undef read
		27	# undef write
		28	# undef send
		29	# undef recv
		30	# undef stat
		31	# undef fstat
		32	# define lstat stat
		33	# undef truncate
		34	# undef ftruncate
		35	# undef open
		36	# undef close
		37	# undef unlink
		38	# undef rmdir
		39	# undef rename
		40	# undef lseek
		41
		42	# define chown(a,b,c) (errno = ENOSYS, -1)
		43	# define fchown(a,b,c) (errno = ENOSYS, -1)
		44	# define fchmod(a,b) (errno = ENOSYS, -1)
		45	# define symlink(a,b) (errno = ENOSYS, -1)
		46	# define readlink(a,b,c) (errno = ENOSYS, -1)
		47	# define mknod(a,b,c) (errno = ENOSYS, -1)
		48	# define truncate(a,b) (errno = ENOSYS, -1)
		49	# define ftruncate(fd,o) chsize ((fd), (o))
		50	# define fsync(fd) _commit (fd)
		51	# define opendir(fd) (errno = ENOSYS, 0)
		52	# define readdir(fd) (errno = ENOSYS, -1)
		53	# define closedir(fd) (errno = ENOSYS, -1)
		54	# define mkdir(a,b) mkdir (a)
		55
		56	#else
		57
		58	# include <sys/time.h>
12	#include <sys/syscall.h>	59	# include <sys/select.h>
		60	# include <unistd.h>
		61	# include <utime.h>
		62	# include <signal.h>
		63	# define EIO_STRUCT_DIRENT struct dirent
		64
13	#endif	65	#endif
14		66
15	#include <pthread.h>	67	#define EIO_STRUCT_STAT Stat_t
16		68
17	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	69	/* use NV for 32 bit perls as it allows larger offsets */
18	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	70	#if IVSIZE >= 8
19	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	71	# define SvVAL64 SvIV
20
21	#if __ia64
22	# define STACKSIZE 65536
23	#else	72	#else
24	# define STACKSIZE 4096	73	# define SvVAL64 SvNV
25	#endif	74	#endif
26		75
		76	static HV *stash;
		77	typedef SV SV8; /* byte-sv, used for argument-checking */
		78
		79	#define AIO_REQ_KLASS "IO::AIO::REQ"
		80	#define AIO_GRP_KLASS "IO::AIO::GRP"
		81
		82	#define EIO_COMMON \
		83	SV *callback; \
		84	SV *sv1, *sv2; \
		85	STRLEN stroffset; \
		86	SV *self
		87
		88	#include "libeio/eio.h"
		89
		90	static int req_invoke (eio_req *req);
		91	#define EIO_FINISH(req) req_invoke (req)
		92	static void aio_grp_feed (eio_req *grp);
		93	#define EIO_FEED(req) aio_grp_feed (req)
		94	static void req_destroy (eio_req *grp);
		95	#define EIO_DESTROY(req) req_destroy (req)
		96
27	enum {	97	enum {
28	REQ_QUIT,	98	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	};	99	};
34		100
35	typedef struct aio_cb {	101	#include "libeio/eio.c"
36	struct aio_cb *volatile next;
37		102
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;	103	typedef eio_req *aio_req;
		104	typedef eio_req *aio_req_ornot;
54		105
55	static int started;
56	static volatile int nreqs;
57	static int max_outstanding = 1<<30;	106	static int max_outstanding = 0;
58	static int respipe [2];
59		107
60	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	108	static int next_pri = EIO_DEFAULT_PRI + EIO_PRI_BIAS;
61	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
62	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
63		109
64	static volatile aio_req reqs, reqe; /* queue start, queue end */	110	static int respipe_osf [2], respipe [2] = { -1, -1 };
65	static volatile aio_req ress, rese; /* queue start, queue end */
66		111
67	static void	112	static void req_destroy (aio_req req);
68	poll_wait ()	113	static void req_cancel (aio_req req);
		114
		115	static void want_poll (void)
69	{	116	{
70	if (nreqs && !ress)	117	/* write a dummy byte to the pipe so fh becomes ready */
		118	respipe_write (respipe_osf [1], (const void *)&respipe_osf, 1);
		119	}
		120
		121	static void done_poll (void)
		122	{
		123	/* read any signals sent by the worker threads */
		124	char buf [4];
		125	while (respipe_read (respipe [0], buf, 4) == 4)
		126	;
		127	}
		128
		129	/* must be called at most once */
		130	static SV *req_sv (aio_req req, const char *klass)
		131	{
		132	if (!req->self)
71	{	133	{
72	fd_set rfd;	134	req->self = (SV *)newHV ();
73	FD_ZERO(&rfd);	135	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	}	136	}
78	}
79		137
80	static int	138	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
81	poll_cb ()	139	}
		140
		141	static aio_req SvAIO_REQ (SV *sv)
		142	{
		143	MAGIC *mg;
		144
		145	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		146	croak ("object of class " AIO_REQ_KLASS " expected");
		147
		148	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		149
		150	return mg ? (aio_req)mg->mg_ptr : 0;
		151	}
		152
		153	static void aio_grp_feed (aio_req grp)
		154	{
		155	if (grp->sv2 && SvOK (grp->sv2))
		156	{
		157	dSP;
		158
		159	ENTER;
		160	SAVETMPS;
		161	PUSHMARK (SP);
		162	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		163	PUTBACK;
		164	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		165	SPAGAIN;
		166	FREETMPS;
		167	LEAVE;
		168	}
		169	}
		170
		171	static int req_invoke (eio_req *req)
82	{	172	{
83	dSP;	173	dSP;
84	int count = 0;
85	aio_req req, prv;
86		174
87	pthread_mutex_lock (&reslock);	175	if (req->flags & FLAG_SV2_RO_OFF)
		176	SvREADONLY_off (req->sv2);
88		177
89	{	178	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	{	179	{
103	nreqs--;	180	ENTER;
		181	SAVETMPS;
		182	PUSHMARK (SP);
		183	EXTEND (SP, 1);
104		184
105	if (req->type == REQ_QUIT)	185	switch (req->type)
106	started--;
107	else
108	{	186	{
109	int errorno = errno;	187	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	{	188	{
124	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	189	SV *rv = &PL_sv_undef;
125	PL_laststatval = req->result;
126	PL_statcache = *(req->statdata);
127		190
128	Safefree (req->statdata);	191	if (req->result >= 0)
		192	{
		193	int i;
		194	char *buf = req->ptr2;
		195	AV *av = newAV ();
		196
		197	av_extend (av, req->result - 1);
		198
		199	for (i = 0; i < req->result; ++i)
		200	{
		201	SV *sv = newSVpv (buf, 0);
		202
		203	av_store (av, i, sv);
		204	buf += SvCUR (sv) + 1;
		205	}
		206
		207	rv = sv_2mortal (newRV_noinc ((SV *)av));
		208	}
		209
		210	PUSHs (rv);
129	}	211	}
		212	break;
130		213
131	ENTER;	214	case EIO_OPEN:
132	PUSHMARK (SP);
133	XPUSHs (sv_2mortal (newSViv (req->result)));
134
135	if (req->type == REQ_OPEN)
136	{	215	{
137	/* convert fd to fh */	216	/* convert fd to fh */
138	SV *fh;	217	SV *fh = &PL_sv_undef;
139		218
140	PUTBACK;	219	if (req->result >= 0)
141	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	220	{
142	SPAGAIN;	221	GV *gv = (GV *)sv_newmortal ();
		222	int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
		223	char sym [64];
		224	int symlen;
		225
		226	symlen = snprintf (sym, sizeof (sym), "fd#%d", req->result);
		227	gv_init (gv, stash, sym, symlen, 0);
143		228
144	fh = SvREFCNT_inc (POPs);	229	symlen = snprintf (
		230	sym,
		231	sizeof (sym),
		232	"%s&=%d",
		233	flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
		234	req->result
		235	);
145		236
		237	if (do_open (gv, sym, symlen, 0, 0, 0, 0))
		238	fh = (SV *)gv;
		239	}
		240
146	PUSHMARK (SP);	241	PUSHs (fh);
147	XPUSHs (sv_2mortal (fh));
148	}	242	}
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;	243	break;
257		244
258	pthread_cond_wait (&reqwait, &reqlock);	245	case EIO_GROUP:
259	}	246	req->int1 = 2; /* mark group as finished */
260		247
261	pthread_mutex_unlock (&reqlock);	248	if (req->sv1)
262
263	errno = 0; /* strictly unnecessary */
264
265	type = req->type;
266
267	switch (type)
268	{	249	{
269	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	250	int i;
270	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	251	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		252
277	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	253	EXTEND (SP, AvFILL (av) + 1);
278	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	254	for (i = 0; i <= AvFILL (av); ++i)
279	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	255	PUSHs (*av_fetch (av, i, 0));
280		256	}
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;	257	break;
290		258
		259	case EIO_NOP:
		260	case EIO_BUSY:
		261	break;
		262
		263	case EIO_READLINK:
		264	if (req->result > 0)
		265	{
		266	SvCUR_set (req->sv2, req->result);
		267	*SvEND (req->sv2) = 0;
		268	PUSHs (req->sv2);
		269	}
		270	break;
		271
		272	case EIO_STAT:
		273	case EIO_LSTAT:
		274	case EIO_FSTAT:
		275	PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
		276	PL_laststatval = req->result;
		277	PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
		278	PUSHs (sv_2mortal (newSViv (req->result)));
		279	break;
		280
		281	case EIO_READ:
		282	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		283	*SvEND (req->sv2) = 0;
		284	PUSHs (sv_2mortal (newSViv (req->result)));
		285	break;
		286
		287	case EIO_DUP2:
		288	if (req->result > 0)
		289	req->result = 0;
		290	/* FALLTHROUGH */
		291
291	default:	292	default:
292	req->result = ENOSYS;	293	PUSHs (sv_2mortal (newSViv (req->result)));
293	break;	294	break;
294	}	295	}
295		296
296	req->errorno = errno;	297	errno = req->errorno;
297		298
298	pthread_mutex_lock (&reslock);	299	PUTBACK;
		300	call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
		301	SPAGAIN;
299		302
300	req->next = 0;	303	FREETMPS;
		304	LEAVE;
301		305
302	if (rese)	306	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	}	307	}
317	while (type != REQ_QUIT);
318		308
		309	return !!SvTRUE (ERRSV);
		310	}
		311
		312	static void req_destroy (aio_req req)
		313	{
		314	if (req->self)
		315	{
		316	sv_unmagic (req->self, PERL_MAGIC_ext);
		317	SvREFCNT_dec (req->self);
		318	}
		319
		320	SvREFCNT_dec (req->sv1);
		321	SvREFCNT_dec (req->sv2);
		322	SvREFCNT_dec (req->callback);
		323
		324	Safefree (req);
		325	}
		326
		327	static void req_cancel_subs (aio_req grp)
		328	{
		329	aio_req sub;
		330
		331	if (grp->type != EIO_GROUP)
		332	return;
		333
		334	SvREFCNT_dec (grp->sv2);
		335	grp->sv2 = 0;
		336
		337	eio_grp_cancel (grp);
		338	}
		339
		340	#ifdef USE_SOCKETS_AS_HANDLES
		341	# define TO_SOCKET(x) (win32_get_osfhandle (x))
		342	#else
		343	# define TO_SOCKET(x) (x)
		344	#endif
		345
		346	static void
		347	create_respipe (void)
		348	{
		349	int old_readfd = respipe [0];
		350
		351	if (respipe [1] >= 0)
		352	respipe_close (TO_SOCKET (respipe [1]));
		353
		354	#ifdef _WIN32
		355	if (PerlSock_socketpair (AF_UNIX, SOCK_STREAM, 0, respipe))
		356	#else
		357	if (pipe (respipe))
		358	#endif
		359	croak ("unable to initialize result pipe");
		360
		361	if (old_readfd >= 0)
		362	{
		363	if (dup2 (TO_SOCKET (respipe [0]), TO_SOCKET (old_readfd)) < 0)
		364	croak ("unable to initialize result pipe(2)");
		365
		366	respipe_close (respipe [0]);
		367	respipe [0] = old_readfd;
		368	}
		369
		370	#ifdef _WIN32
		371	int arg = 1;
		372	if (ioctlsocket (TO_SOCKET (respipe [0]), FIONBIO, &arg)
		373	|| ioctlsocket (TO_SOCKET (respipe [1]), FIONBIO, &arg))
		374	#else
		375	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)
		376	|| fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		377	#endif
		378	croak ("unable to initialize result pipe(3)");
		379
		380	respipe_osf [0] = TO_SOCKET (respipe [0]);
		381	respipe_osf [1] = TO_SOCKET (respipe [1]);
		382	}
		383
		384	static void poll_wait (void)
		385	{
		386	fd_set rfd;
		387
		388	while (eio_nreqs ())
		389	{
		390	int size;
		391
		392	X_LOCK (reslock);
		393	size = res_queue.size;
		394	X_UNLOCK (reslock);
		395
		396	if (size)
		397	return;
		398
		399	maybe_start_thread ();
		400
		401	FD_ZERO (&rfd);
		402	FD_SET (respipe [0], &rfd);
		403
		404	PerlSock_select (respipe [0] + 1, &rfd, 0, 0, 0);
		405	}
		406	}
		407
		408	static int poll_cb (void)
		409	{
		410	int res;
		411
		412	do
		413	{
		414	res = eio_poll ();
		415
		416	if (res > 0)
		417	croak (0);
		418	}
		419	while (max_outstanding && max_outstanding <= eio_nreqs ());
		420
319	return 0;	421	return res;
320	}	422	}
321		423
		424	static void atfork_child (void)
		425	{
		426	create_respipe ();
		427	}
		428
		429	#define dREQ \
		430	aio_req req; \
		431	int req_pri = next_pri; \
		432	next_pri = EIO_DEFAULT_PRI + EIO_PRI_BIAS; \
		433	\
		434	if (SvOK (callback) && !SvROK (callback)) \
		435	croak ("callback must be undef or of reference type"); \
		436	\
		437	Newz (0, req, 1, eio_req); \
		438	if (!req) \
		439	croak ("out of memory during eio_req allocation"); \
		440	\
		441	req->callback = newSVsv (callback); \
		442	req->pri = req_pri
		443
		444	#define REQ_SEND \
		445	eio_submit (req); \
		446	\
		447	if (GIMME_V != G_VOID) \
		448	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		449
322	MODULE = IO::AIO PACKAGE = IO::AIO	450	MODULE = IO::AIO PACKAGE = IO::AIO
323		451
324	PROTOTYPES: ENABLE	452	PROTOTYPES: ENABLE
325		453
326	BOOT:	454	BOOT:
327	{	455	{
328	if (pipe (respipe))	456	stash = gv_stashpv ("IO::AIO", 1);
329	croak ("unable to initialize result pipe");
330		457
331	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	458	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
332	croak ("cannot set result pipe to nonblocking mode");	459	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		460	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		461	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		462	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		463	#ifdef _WIN32
		464	X_MUTEX_CHECK (wrklock);
		465	X_MUTEX_CHECK (reslock);
		466	X_MUTEX_CHECK (reqlock);
		467	X_MUTEX_CHECK (reqwait);
		468	X_MUTEX_CHECK (preadwritelock);
		469	X_MUTEX_CHECK (readdirlock);
333		470
334	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	471	X_COND_CHECK (reqwait);
335	croak ("cannot set result pipe to nonblocking mode");	472	#else
336	}	473	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		474	#endif
337		475
		476	create_respipe ();
		477
		478	if (eio_init (want_poll, done_poll) < 0)
		479	croak ("IO::AIO: unable to initialise eio library");
		480
		481	/* atfork child called in fifo order, so before eio's handler */
		482	X_THREAD_ATFORK (0, 0, atfork_child);
		483	}
		484
338	void	485	void
339	min_parallel(nthreads)	486	max_poll_reqs (int nreqs)
340	int nthreads
341	PROTOTYPE: $	487	PROTOTYPE: $
342	CODE:	488	CODE:
343	while (nthreads > started)	489	eio_set_max_poll_reqs (nreqs);
344	start_thread ();
345		490
346	void	491	void
347	max_parallel(nthreads)	492	max_poll_time (double nseconds)
348	int nthreads
349	PROTOTYPE: $	493	PROTOTYPE: $
350	CODE:	494	CODE:
		495	eio_set_max_poll_time (nseconds);
		496
		497	void
		498	min_parallel (int nthreads)
		499	PROTOTYPE: $
		500	CODE:
		501	eio_set_min_parallel (nthreads);
		502
		503	void
		504	max_parallel (int nthreads)
		505	PROTOTYPE: $
		506	CODE:
		507	eio_set_max_parallel (nthreads);
		508
		509	void
		510	max_idle (int nthreads)
		511	PROTOTYPE: $
		512	CODE:
		513	eio_set_max_idle (nthreads);
		514
		515	void
		516	max_outstanding (int maxreqs)
		517	PROTOTYPE: $
		518	CODE:
		519	max_outstanding = maxreqs;
		520
		521	void
		522	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
		523	PROTOTYPE: $$$;$
		524	PPCODE:
351	{	525	{
352	int cur = started;	526	dREQ;
353	while (cur > nthreads)	527
354	{	528	req->type = EIO_OPEN;
355	end_thread ();	529	req->sv1 = newSVsv (pathname);
		530	req->ptr1 = SvPVbyte_nolen (req->sv1);
		531	req->int1 = flags;
		532	req->int2 = mode;
		533
		534	REQ_SEND;
		535	}
		536
		537	void
		538	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
		539	PROTOTYPE: $;$
		540	ALIAS:
		541	aio_fsync = EIO_FSYNC
		542	aio_fdatasync = EIO_FDATASYNC
		543	PPCODE:
		544	{
		545	dREQ;
		546
		547	req->type = ix;
		548	req->sv1 = newSVsv (fh);
		549	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		550
		551	REQ_SEND (req);
		552	}
		553
		554	void
		555	aio_close (SV *fh, SV *callback=&PL_sv_undef)
		556	PROTOTYPE: $;$
		557	PPCODE:
		558	{
		559	static int close_pipe = -1; /* dummy fd to close fds via dup2 */
		560	dREQ;
		561
		562	if (close_pipe < 0)
		563	{
		564	int pipefd [2];
		565
		566	if (pipe (pipefd) < 0
		567	|| close (pipefd [1]) < 0
		568	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
		569	abort (); /*D*/
		570
		571	close_pipe = pipefd [0];
		572	}
		573
		574	req->type = EIO_DUP2;
		575	req->int1 = close_pipe;
		576	req->sv2 = newSVsv (fh);
		577	req->int2 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		578
		579	REQ_SEND (req);
		580	}
		581
		582	void
		583	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
		584	ALIAS:
		585	aio_read = EIO_READ
		586	aio_write = EIO_WRITE
		587	PROTOTYPE: $$$$$;$
		588	PPCODE:
		589	{
		590	STRLEN svlen;
		591	char *svptr = SvPVbyte (data, svlen);
		592	UV len = SvUV (length);
		593
		594	SvUPGRADE (data, SVt_PV);
		595	SvPOK_on (data);
		596
		597	if (dataoffset < 0)
		598	dataoffset += svlen;
		599
		600	if (dataoffset < 0 || dataoffset > svlen)
		601	croak ("dataoffset outside of data scalar");
		602
		603	if (ix == EIO_WRITE)
		604	{
		605	/* write: check length and adjust. */
		606	if (!SvOK (length) || len + dataoffset > svlen)
		607	len = svlen - dataoffset;
		608	}
		609	else
		610	{
		611	/* read: grow scalar as necessary */
		612	svptr = SvGROW (data, len + dataoffset + 1);
		613	}
		614
		615	if (len < 0)
		616	croak ("length must not be negative");
		617
		618	{
		619	dREQ;
		620
		621	req->type = ix;
		622	req->sv1 = newSVsv (fh);
		623	req->int1 = PerlIO_fileno (ix == EIO_READ ? IoIFP (sv_2io (fh))
		624	: IoOFP (sv_2io (fh)));
		625	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		626	req->size = len;
		627	req->sv2 = SvREFCNT_inc (data);
		628	req->ptr2 = (char *)svptr + dataoffset;
		629	req->stroffset = dataoffset;
		630
		631	if (!SvREADONLY (data))
356	cur--;	632	{
		633	SvREADONLY_on (data);
		634	req->flags |= FLAG_SV2_RO_OFF;
357	}	635	}
358		636
359	while (started > nthreads)	637	REQ_SEND;
		638	}
		639	}
		640
		641	void
		642	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		643	PROTOTYPE: $$;$
		644	PPCODE:
		645	{
		646	SV *data;
		647	dREQ;
		648
		649	data = newSV (NAME_MAX);
		650	SvPOK_on (data);
		651
		652	req->type = EIO_READLINK;
		653	req->sv1 = newSVsv (path);
		654	req->ptr1 = SvPVbyte_nolen (req->sv1);
		655	req->sv2 = data;
		656	req->ptr2 = SvPVbyte_nolen (data);
		657
		658	REQ_SEND;
		659	}
		660
		661	void
		662	aio_sendfile (SV *out_fh, SV *in_fh, SV *in_offset, UV length, SV *callback=&PL_sv_undef)
		663	PROTOTYPE: $$$$;$
		664	PPCODE:
		665	{
		666	dREQ;
		667
		668	req->type = EIO_SENDFILE;
		669	req->sv1 = newSVsv (out_fh);
		670	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		671	req->sv2 = newSVsv (in_fh);
		672	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		673	req->offs = SvVAL64 (in_offset);
		674	req->size = length;
		675
		676	REQ_SEND;
		677	}
		678
		679	void
		680	aio_readahead (SV *fh, SV *offset, IV length, SV *callback=&PL_sv_undef)
		681	PROTOTYPE: $$$;$
		682	PPCODE:
		683	{
		684	dREQ;
		685
		686	req->type = EIO_READAHEAD;
		687	req->sv1 = newSVsv (fh);
		688	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
		689	req->offs = SvVAL64 (offset);
		690	req->size = length;
		691
		692	REQ_SEND;
		693	}
		694
		695	void
		696	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
		697	ALIAS:
		698	aio_stat = EIO_STAT
		699	aio_lstat = EIO_LSTAT
		700	PPCODE:
		701	{
		702	dREQ;
		703
		704	req->ptr2 = malloc (sizeof (EIO_STRUCT_STAT));
		705	if (!req->ptr2)
		706	{
		707	req_destroy (req);
		708	croak ("out of memory during aio_stat statdata allocation");
		709	}
		710
		711	req->flags |= EIO_FLAG_PTR2_FREE;
		712	req->sv1 = newSVsv (fh_or_path);
		713
		714	if (SvPOK (fh_or_path))
		715	{
		716	req->type = ix;
		717	req->ptr1 = SvPVbyte_nolen (req->sv1);
		718	}
		719	else
		720	{
		721	req->type = EIO_FSTAT;
		722	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		723	}
		724
		725	REQ_SEND;
		726	}
		727
		728	void
		729	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		730	PPCODE:
		731	{
		732	dREQ;
		733
		734	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		735	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		736	req->sv1 = newSVsv (fh_or_path);
		737
		738	if (SvPOK (fh_or_path))
		739	{
		740	req->type = EIO_UTIME;
		741	req->ptr1 = SvPVbyte_nolen (req->sv1);
		742	}
		743	else
		744	{
		745	req->type = EIO_FUTIME;
		746	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		747	}
		748
		749	REQ_SEND;
		750	}
		751
		752	void
		753	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		754	PPCODE:
		755	{
		756	dREQ;
		757
		758	req->sv1 = newSVsv (fh_or_path);
		759	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		760
		761	if (SvPOK (fh_or_path))
		762	{
		763	req->type = EIO_TRUNCATE;
		764	req->ptr1 = SvPVbyte_nolen (req->sv1);
		765	}
		766	else
		767	{
		768	req->type = EIO_FTRUNCATE;
		769	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		770	}
		771
		772	REQ_SEND;
		773	}
		774
		775	void
		776	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		777	ALIAS:
		778	aio_chmod = EIO_CHMOD
		779	aio_fchmod = EIO_FCHMOD
		780	aio_mkdir = EIO_MKDIR
		781	PPCODE:
		782	{
		783	dREQ;
		784
		785	req->type = ix;
		786	req->int2 = mode;
		787	req->sv1 = newSVsv (fh_or_path);
		788
		789	if (ix == EIO_FCHMOD)
		790	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		791	else
		792	req->ptr1 = SvPVbyte_nolen (req->sv1);
		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 (fh_or_path))
		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 - EIO_PRI_BIAS;
		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 + EIO_PRI_BIAS;
		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 + EIO_PRI_BIAS;
		932
		933	void
		934	flush ()
		935	PROTOTYPE:
		936	CODE:
		937	while (eio_nreqs ())
360	{	938	{
361	poll_wait ();	939	poll_wait ();
362	poll_cb ();	940	poll_cb ();
363	}	941	}
364	}
365		942
366	int	943	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()	944	poll()
587	PROTOTYPE:	945	PROTOTYPE:
588	CODE:	946	CODE:
589	if (nreqs)
590	{
591	poll_wait ();	947	poll_wait ();
592	poll_cb ();	948	RETVAL = poll_cb ();
593	}	949	OUTPUT:
		950	RETVAL
594		951
595	int	952	int
596	poll_fileno()	953	poll_fileno()
597	PROTOTYPE:	954	PROTOTYPE:
598	CODE:	955	CODE:
…		…
610		967
611	void	968	void
612	poll_wait()	969	poll_wait()
613	PROTOTYPE:	970	PROTOTYPE:
614	CODE:	971	CODE:
615	if (nreqs)
616	poll_wait ();	972	poll_wait ();
617		973
618	int	974	int
619	nreqs()	975	nreqs()
620	PROTOTYPE:	976	PROTOTYPE:
621	CODE:	977	CODE:
622	RETVAL = nreqs;	978	RETVAL = eio_nreqs ();
623	OUTPUT:	979	OUTPUT:
624	RETVAL	980	RETVAL
625		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	if (WORDACCESS_UNSAFE) X_LOCK (wrklock);
		1003	RETVAL = started;
		1004	if (WORDACCESS_UNSAFE) X_UNLOCK (wrklock);
		1005	OUTPUT:
		1006	RETVAL
		1007
		1008	PROTOTYPES: DISABLE
		1009
		1010	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1011
		1012	void
		1013	cancel (aio_req_ornot req)
		1014	CODE:
		1015	eio_cancel (req);
		1016
		1017	void
		1018	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1019	CODE:
		1020	SvREFCNT_dec (req->callback);
		1021	req->callback = newSVsv (callback);
		1022
		1023	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1024
		1025	void
		1026	add (aio_req grp, ...)
		1027	PPCODE:
		1028	{
		1029	int i;
		1030
		1031	if (grp->int1 == 2)
		1032	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1033
		1034	for (i = 1; i < items; ++i )
		1035	{
		1036	aio_req req;
		1037
		1038	if (GIMME_V != G_VOID)
		1039	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1040
		1041	req = SvAIO_REQ (ST (i));
		1042
		1043	if (req)
		1044	eio_grp_add (grp, req);
		1045	}
		1046	}
		1047
		1048	void
		1049	cancel_subs (aio_req_ornot req)
		1050	CODE:
		1051	req_cancel_subs (req);
		1052
		1053	void
		1054	result (aio_req grp, ...)
		1055	CODE:
		1056	{
		1057	int i;
		1058	AV *av;
		1059
		1060	grp->errorno = errno;
		1061
		1062	av = newAV ();
		1063
		1064	for (i = 1; i < items; ++i )
		1065	av_push (av, newSVsv (ST (i)));
		1066
		1067	SvREFCNT_dec (grp->sv1);
		1068	grp->sv1 = (SV *)av;
		1069	}
		1070
		1071	void
		1072	errno (aio_req grp, int errorno = errno)
		1073	CODE:
		1074	grp->errorno = errorno;
		1075
		1076	void
		1077	limit (aio_req grp, int limit)
		1078	CODE:
		1079	eio_grp_limit (grp, limit);
		1080
		1081	void
		1082	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1083	CODE:
		1084	{
		1085	SvREFCNT_dec (grp->sv2);
		1086	grp->sv2 = newSVsv (callback);
		1087
		1088	if (grp->int2 <= 0)
		1089	grp->int2 = 2;
		1090
		1091	eio_grp_limit (grp, grp->int2);
		1092	}
		1093

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