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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.48 by root, Sun Oct 22 10:33:19 2006 UTC vs.
Revision 1.148 by root, Wed Jun 17 01:14:48 2009 UTC

1	#define _REENTRANT 1	1	#include "libeio/xthread.h"
		2
2	#include <errno.h>	3	#include <errno.h>
3		4
4	#include "EXTERN.h"	5	#include "EXTERN.h"
5	#include "perl.h"	6	#include "perl.h"
6	#include "XSUB.h"	7	#include "XSUB.h"
7		8
8	#include "autoconf/config.h"
9
10	#include <pthread.h>
11
12	#include <stddef.h>	9	#include <stddef.h>
		10	#include <stdlib.h>
13	#include <errno.h>	11	#include <errno.h>
14	#include <sys/time.h>
15	#include <sys/select.h>
16	#include <sys/types.h>	12	#include <sys/types.h>
17	#include <sys/stat.h>	13	#include <sys/stat.h>
18	#include <limits.h>	14	#include <limits.h>
19	#include <unistd.h>
20	#include <fcntl.h>	15	#include <fcntl.h>
21	#include <signal.h>
22	#include <sched.h>	16	#include <sched.h>
23		17
24	#if HAVE_SENDFILE	18	/* perl namespace pollution */
25	# if __linux	19	#undef VERSION
26	# include <sys/sendfile.h>	20
27	# elif __freebsd	21	#ifdef _WIN32
28	# include <sys/socket.h>	22
29	# include <sys/uio.h>	23	# define EIO_STRUCT_DIRENT Direntry_t
30	# elif __hpux	24	# undef malloc
31	# include <sys/socket.h>	25	# undef free
32	# elif __solaris /* not yet */	26
33	# include <sys/sendfile.h>	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
34	# else	59	#else
35	# error sendfile support requested but not available	60
36	# endif	61	# include <sys/time.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
37	#endif	68	#endif
38		69
39	/* used for struct dirent, AIX doesn't provide it */	70	/* perl stupidly overrides readdir and maybe others */
40	#ifndef NAME_MAX	71	/* with thread-unsafe versions, imagine that :( */
41	# define NAME_MAX 4096	72	#undef readdir
		73	#undef opendir
		74	#undef closedir
		75
		76	#define EIO_STRUCT_STAT Stat_t
		77
		78	/* use NV for 32 bit perls as it allows larger offsets */
		79	#if IVSIZE >= 8
		80	# define VAL64 IV
		81	# define SvVAL64 SvIV
		82	# define newSVval64 newSViv
		83	#else
		84	# define VAL64 NV
		85	# define SvVAL64 SvNV
		86	# define newSVval64 newSVnv
42	#endif	87	#endif
43		88
44	#if __ia64	89	/*****************************************************************************/
45	# define STACKSIZE 65536	90
		91	#if __GNUC__ >= 3
		92	# define expect(expr,value) __builtin_expect ((expr),(value))
46	#else	93	#else
47	# define STACKSIZE 8192	94	# define expect(expr,value) (expr)
48	#endif	95	#endif
49		96
50	enum {	97	#define expect_false(expr) expect ((expr) != 0, 0)
51	REQ_QUIT,	98	#define expect_true(expr) expect ((expr) != 0, 1)
52	REQ_OPEN, REQ_CLOSE,	99
53	REQ_READ, REQ_WRITE, REQ_READAHEAD,	100	/*****************************************************************************/
54	REQ_SENDFILE,	101
55	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	102	static HV *stash;
56	REQ_FSYNC, REQ_FDATASYNC,	103	typedef SV SV8; /* byte-sv, used for argument-checking */
57	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,	104	typedef int aio_rfd; /* read file desriptor */
58	REQ_READDIR,	105	typedef int aio_wfd; /* write file descriptor */
59	REQ_LINK, REQ_SYMLINK,
60	REQ_SLEEP,
61	REQ_GROUP,
62	};
63		106
64	#define AIO_REQ_KLASS "IO::AIO::REQ"	107	#define AIO_REQ_KLASS "IO::AIO::REQ"
65	#define AIO_GRP_KLASS "IO::AIO::GRP"	108	#define AIO_GRP_KLASS "IO::AIO::GRP"
66		109
67	typedef struct aio_cb	110	#define EIO_REQ_MEMBERS \
68	{
69	struct aio_cb *grp, *grp_prev, *grp_next;
70
71	struct aio_cb *volatile next;
72
73	SV *self; /* the perl counterpart of this request, if any */
74
75	SV *data, *callback;	111	SV *callback; \
76	SV *fh, *fh2;	112	SV *sv1, *sv2; \
77	void *dataptr, *data2ptr;
78	Stat_t *statdata;
79	off_t offset;
80	size_t length;
81	ssize_t result;
82
83	int type;
84	int fd, fd2;
85	int errorno;
86	STRLEN dataoffset;	113	STRLEN stroffset; \
87	mode_t mode; /* open */	114	SV *self;
88	unsigned char cancelled;
89	} aio_cb;
90		115
		116	#define EIO_NO_WRAPPERS 1
		117
		118	#include "libeio/eio.h"
		119
		120	#ifndef POSIX_FADV_NORMAL
		121	# define POSIX_FADV_NORMAL 0
		122	#endif
		123
		124	#ifndef POSIX_FADV_SEQUENTIAL
		125	# define POSIX_FADV_SEQUENTIAL 0
		126	#endif
		127
		128	#ifndef POSIX_FADV_RANDOM
		129	# define POSIX_FADV_RANDOM 0
		130	#endif
		131
		132	#ifndef POSIX_FADV_NOREUSE
		133	# define POSIX_FADV_NOREUSE 0
		134	#endif
		135
		136	#ifndef POSIX_FADV_WILLNEED
		137	# define POSIX_FADV_WILLNEED 0
		138	#endif
		139
		140	#ifndef POSIX_FADV_DONTNEED
		141	# define POSIX_FADV_DONTNEED 0
		142	#endif
		143
		144	static int req_invoke (eio_req *req);
		145	#define EIO_FINISH(req) req_invoke (req)
		146	static void req_destroy (eio_req *grp);
		147	#define EIO_DESTROY(req) req_destroy (req)
		148
		149	enum {
		150	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
		151	};
		152
		153	#include "libeio/eio.c"
		154
91	typedef aio_cb *aio_req;	155	typedef eio_req *aio_req;
92	typedef aio_cb *aio_req_ornot;	156	typedef eio_req *aio_req_ornot;
93		157
94	static int started, wanted;	158	static SV *on_next_submit;
95	static volatile int nreqs;	159	static int next_pri = EIO_PRI_DEFAULT;
96	static int max_outstanding = 1<<30;	160	static int max_outstanding;
97	static int respipe [2];
98		161
99	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	162	static int respipe_osf [2], respipe [2] = { -1, -1 };
100	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
101	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
102		163
103	static volatile aio_req reqs, reqe; /* queue start, queue end */	164	static void req_destroy (aio_req req);
104	static volatile aio_req ress, rese; /* queue start, queue end */
105
106	static void req_free (aio_req req);	165	static void req_cancel (aio_req req);
		166
		167	static void want_poll (void)
		168	{
		169	/* write a dummy byte to the pipe so fh becomes ready */
		170	respipe_write (respipe_osf [1], (const void *)&respipe_osf, 1);
		171	}
		172
		173	static void done_poll (void)
		174	{
		175	/* read any signals sent by the worker threads */
		176	char buf [4];
		177	while (respipe_read (respipe [0], buf, 4) == 4)
		178	;
		179	}
107		180
108	/* must be called at most once */	181	/* must be called at most once */
109	static SV *req_sv (aio_req req, const char *klass)	182	static SV *req_sv (aio_req req, const char *klass)
110	{	183	{
		184	if (!req->self)
		185	{
111	req->self = (SV *)newHV ();	186	req->self = (SV *)newHV ();
112	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);	187	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		188	}
113		189
114	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));	190	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
115	}	191	}
116		192
117	static aio_req SvAIO_REQ (SV *sv)	193	static aio_req SvAIO_REQ (SV *sv)
118	{	194	{
		195	MAGIC *mg;
		196
119	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))	197	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
120	croak ("object of class " AIO_REQ_KLASS " expected");	198	croak ("object of class " AIO_REQ_KLASS " expected");
121		199
122	MAGIC *mg = mg_find (SvRV (sv), PERL_MAGIC_ext);	200	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
123		201
124	return mg ? (aio_req)mg->mg_ptr : 0;	202	return mg ? (aio_req)mg->mg_ptr : 0;
125	}	203	}
126		204
127	static void poll_wait ()	205	static void aio_grp_feed (aio_req grp)
128	{	206	{
129	if (nreqs && !ress)	207	if (grp->sv2 && SvOK (grp->sv2))
130	{	208	{
131	fd_set rfd;	209	dSP;
132	FD_ZERO(&rfd);
133	FD_SET(respipe [0], &rfd);
134		210
135	select (respipe [0] + 1, &rfd, 0, 0, 0);	211	ENTER;
		212	SAVETMPS;
		213	PUSHMARK (SP);
		214	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		215	PUTBACK;
		216	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		217	SPAGAIN;
		218	FREETMPS;
		219	LEAVE;
136	}	220	}
137	}	221	}
138		222
		223	static void req_submit (eio_req *req)
		224	{
		225	eio_submit (req);
		226
		227	if (expect_false (on_next_submit))
		228	{
		229	dSP;
		230	SV *cb = sv_2mortal (on_next_submit);
		231
		232	on_next_submit = 0;
		233
		234	PUSHMARK (SP);
		235	PUTBACK;
		236	call_sv (cb, G_DISCARD | G_EVAL);
		237	}
		238	}
		239
139	static void req_invoke (aio_req req)	240	static int req_invoke (eio_req *req)
140	{	241	{
141	dSP;	242	dSP;
142	int errorno = errno;
143		243
144	if (req->cancelled || !SvOK (req->callback))	244	if (req->flags & FLAG_SV2_RO_OFF)
145	return;	245	SvREADONLY_off (req->sv2);
146		246
147	errno = req->errorno;	247	if (!EIO_CANCELLED (req) && req->callback)
148
149	ENTER;
150	PUSHMARK (SP);
151	EXTEND (SP, 1);
152
153	switch (req->type)
154	{	248	{
155	case REQ_READDIR:	249	ENTER;
		250	SAVETMPS;
		251	PUSHMARK (SP);
		252	EXTEND (SP, 1);
		253
		254	switch (req->type)
156	{	255	{
157	SV *rv = &PL_sv_undef;	256	case EIO_READDIR:
158
159	if (req->result >= 0)
160	{	257	{
161	char *buf = req->data2ptr;	258	SV *rv = &PL_sv_undef;
162	AV *av = newAV ();
163		259
164	while (req->result)	260	if (req->result >= 0)
165	{	261	{
		262	int i;
		263	char *names = (char *)req->ptr2;
		264	eio_dirent *ent = (eio_dirent *)req->ptr1; /* might be 0 */
166	SV *sv = newSVpv (buf, 0);	265	AV *av = newAV ();
167		266
168	av_push (av, sv);	267	av_extend (av, req->result - 1);
		268
		269	for (i = 0; i < req->result; ++i)
		270	{
		271	if (req->int1 & EIO_READDIR_DENTS)
		272	{
		273	SV *namesv = newSVpvn (names + ent->nameofs, ent->namelen);
		274
		275	if (req->int1 & EIO_READDIR_CUSTOM2)
		276	{
		277	static SV *sv_type [EIO_DT_MAX + 1]; /* type sv cache */
		278	AV *avent = newAV ();
		279
		280	av_extend (avent, 2);
		281
		282	if (!sv_type [ent->type])
		283	{
		284	sv_type [ent->type] = newSViv (ent->type);
		285	SvREADONLY_on (sv_type [ent->type]);
		286	}
		287
		288	av_store (avent, 0, namesv);
		289	av_store (avent, 1, SvREFCNT_inc (sv_type [ent->type]));
		290	av_store (avent, 2, IVSIZE >= 8 ? newSVuv (ent->inode) : newSVnv (ent->inode));
		291
		292	av_store (av, i, newRV_noinc ((SV *)avent));
		293	}
		294	else
		295	av_store (av, i, namesv);
		296
		297	++ent;
		298	}
		299	else
		300	{
		301	SV *name = newSVpv (names, 0);
		302	av_store (av, i, name);
169	buf += SvCUR (sv) + 1;	303	names += SvCUR (name) + 1;
170	req->result--;	304	}
		305	}
		306
		307	rv = sv_2mortal (newRV_noinc ((SV *)av));
171	}	308	}
172		309
173	rv = sv_2mortal (newRV_noinc ((SV *)av));	310	PUSHs (rv);
		311
		312	if (req->int1 & EIO_READDIR_CUSTOM1)
		313	XPUSHs (sv_2mortal (newSViv (req->int1 & ~(EIO_READDIR_CUSTOM1 | EIO_READDIR_CUSTOM2))));
174	}	314	}
		315	break;
175		316
		317	case EIO_OPEN:
		318	{
		319	/* convert fd to fh */
		320	SV *fh = &PL_sv_undef;
		321
		322	if (req->result >= 0)
		323	{
		324	GV *gv = (GV *)sv_newmortal ();
		325	int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
		326	char sym [64];
		327	int symlen;
		328
		329	symlen = snprintf (sym, sizeof (sym), "fd#%d", (int)req->result);
		330	gv_init (gv, stash, sym, symlen, 0);
		331
		332	symlen = snprintf (
		333	sym,
		334	sizeof (sym),
		335	"%s&=%d",
		336	flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
		337	(int)req->result
		338	);
		339
		340	if (do_open (gv, sym, symlen, 0, 0, 0, 0))
		341	fh = (SV *)gv;
		342	}
		343
176	PUSHs (rv);	344	PUSHs (fh);
		345	}
		346	break;
		347
		348	case EIO_GROUP:
		349	req->int1 = 2; /* mark group as finished */
		350
		351	if (req->sv1)
		352	{
		353	int i;
		354	AV *av = (AV *)req->sv1;
		355
		356	EXTEND (SP, AvFILL (av) + 1);
		357	for (i = 0; i <= AvFILL (av); ++i)
		358	PUSHs (*av_fetch (av, i, 0));
		359	}
		360	break;
		361
		362	case EIO_NOP:
		363	case EIO_BUSY:
		364	break;
		365
		366	case EIO_READLINK:
		367	if (req->result > 0)
		368	PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
		369	break;
		370
		371	case EIO_STAT:
		372	case EIO_LSTAT:
		373	case EIO_FSTAT:
		374	PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
		375	PL_laststatval = req->result;
		376	PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
		377	PUSHs (sv_2mortal (newSViv (req->result)));
		378	break;
		379
		380	case EIO_READ:
		381	{
		382	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		383	*SvEND (req->sv2) = 0;
		384	SvPOK_only (req->sv2);
		385	SvSETMAGIC (req->sv2);
		386	PUSHs (sv_2mortal (newSViv (req->result)));
		387	}
		388	break;
		389
		390	case EIO_DUP2:
		391	if (req->result > 0)
		392	req->result = 0;
		393	/* FALLTHROUGH */
		394
		395	default:
		396	PUSHs (sv_2mortal (newSViv (req->result)));
		397	break;
177	}	398	}
178	break;
179		399
180	case REQ_OPEN:	400	errno = req->errorno;
181	{
182	/* convert fd to fh */
183	SV *fh;
184		401
185	PUSHs (sv_2mortal (newSViv (req->result)));
186	PUTBACK;	402	PUTBACK;
187	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	403	call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
188	SPAGAIN;	404	SPAGAIN;
189		405
190	fh = SvREFCNT_inc (POPs);	406	FREETMPS;
		407	LEAVE;
191		408
192	PUSHMARK (SP);	409	PUTBACK;
193	XPUSHs (sv_2mortal (fh));
194	}
195	break;
196
197	case REQ_GROUP:
198	if (req->data)
199	{
200	int i;
201	AV *av = (AV *)req->data;
202
203	EXTEND (SP, AvFILL (av) + 1);
204	for (i = 0; i <= AvFILL (av); ++i)
205	PUSHs (*av_fetch (av, i, 0));
206	}
207	break;
208
209	case REQ_SLEEP:
210	break;
211
212	default:
213	PUSHs (sv_2mortal (newSViv (req->result)));
214	break;
215	}	410	}
216		411
217		412	return !!SvTRUE (ERRSV);
218	PUTBACK;
219	call_sv (req->callback, G_VOID | G_EVAL);
220	SPAGAIN;
221
222	if (SvTRUE (ERRSV))
223	{
224	req_free (req);
225	croak (0);
226	}
227
228	LEAVE;
229
230	errno = errorno;
231	}	413	}
232		414
233	static void req_free (aio_req req)	415	static void req_destroy (aio_req req)
234	{	416	{
235	if (req->grp)
236	{
237	aio_req grp = req->grp;
238
239	/* unlink request */
240	req->grp_next->grp_prev = req->grp_prev;
241	req->grp_prev->grp_next = req->grp_next;
242
243	if (grp->grp_next == grp && grp->fd)
244	{
245	req_invoke (grp);
246	req_free (grp);
247	}
248	}
249
250	if (req->self)	417	if (req->self)
251	{	418	{
252	sv_unmagic (req->self, PERL_MAGIC_ext);	419	sv_unmagic (req->self, PERL_MAGIC_ext);
253	SvREFCNT_dec (req->self);	420	SvREFCNT_dec (req->self);
254	}	421	}
255		422
256	if (req->data)
257	SvREFCNT_dec (req->data);
258
259	if (req->fh)
260	SvREFCNT_dec (req->fh);	423	SvREFCNT_dec (req->sv1);
261
262	if (req->fh2)
263	SvREFCNT_dec (req->fh2);	424	SvREFCNT_dec (req->sv2);
264
265	if (req->statdata)
266	Safefree (req->statdata);
267
268	if (req->callback)
269	SvREFCNT_dec (req->callback);	425	SvREFCNT_dec (req->callback);
270
271	if (req->type == REQ_READDIR && req->result >= 0)
272	free (req->data2ptr);
273		426
274	Safefree (req);	427	Safefree (req);
275	}	428	}
276		429
277	static void req_cancel (aio_req req)	430	static void req_cancel_subs (aio_req grp)
278	{	431	{
279	req->cancelled = 1;	432	aio_req sub;
280		433
281	if (req->type == REQ_GROUP)	434	if (grp->type != EIO_GROUP)
		435	return;
		436
		437	SvREFCNT_dec (grp->sv2);
		438	grp->sv2 = 0;
		439
		440	eio_grp_cancel (grp);
		441	}
		442
		443	#ifdef USE_SOCKETS_AS_HANDLES
		444	# define TO_SOCKET(x) (win32_get_osfhandle (x))
		445	#else
		446	# define TO_SOCKET(x) (x)
		447	#endif
		448
		449	static void
		450	create_respipe (void)
		451	{
		452	int old_readfd = respipe [0];
		453
		454	if (respipe [1] >= 0)
		455	respipe_close (TO_SOCKET (respipe [1]));
		456
		457	#ifdef _WIN32
		458	if (PerlSock_socketpair (AF_UNIX, SOCK_STREAM, 0, respipe))
		459	#else
		460	if (pipe (respipe))
		461	#endif
		462	croak ("unable to initialize result pipe");
		463
		464	if (old_readfd >= 0)
282	{	465	{
283	aio_req sub;	466	if (dup2 (TO_SOCKET (respipe [0]), TO_SOCKET (old_readfd)) < 0)
		467	croak ("unable to initialize result pipe(2)");
284		468
285	for (sub = req->grp_next; sub != req; sub = sub->grp_next)	469	respipe_close (respipe [0]);
286	req_cancel (sub);	470	respipe [0] = old_readfd;
287	}	471	}
288	}
289		472
		473	#ifdef _WIN32
		474	int arg = 1;
		475	if (ioctlsocket (TO_SOCKET (respipe [0]), FIONBIO, &arg)
		476	|| ioctlsocket (TO_SOCKET (respipe [1]), FIONBIO, &arg))
		477	#else
		478	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)
		479	|| fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		480	#endif
		481	croak ("unable to initialize result pipe(3)");
		482
		483	respipe_osf [0] = TO_SOCKET (respipe [0]);
		484	respipe_osf [1] = TO_SOCKET (respipe [1]);
		485	}
		486
		487	static void poll_wait (void)
		488	{
		489	fd_set rfd;
		490
		491	while (eio_nreqs ())
		492	{
		493	int size;
		494
		495	X_LOCK (reslock);
		496	size = res_queue.size;
		497	X_UNLOCK (reslock);
		498
		499	if (size)
		500	return;
		501
		502	etp_maybe_start_thread ();
		503
		504	FD_ZERO (&rfd);
		505	FD_SET (respipe [0], &rfd);
		506
		507	PerlSock_select (respipe [0] + 1, &rfd, 0, 0, 0);
		508	}
		509	}
		510
290	static int poll_cb ()	511	static int poll_cb (void)
291	{	512	{
292	dSP;
293	int count = 0;
294	int do_croak = 0;
295	aio_req req;
296
297	for (;;)	513	for (;;)
298	{	514	{
299	pthread_mutex_lock (&reslock);	515	int res = eio_poll ();
300	req = ress;
301		516
302	if (req)	517	if (res > 0)
303	{
304	ress = req->next;
305
306	if (!ress)
307	{
308	/* read any signals sent by the worker threads */
309	char buf [32];
310	while (read (respipe [0], buf, 32) == 32)
311	;
312
313	rese = 0;
314	}
315	}
316
317	pthread_mutex_unlock (&reslock);
318
319	if (!req)
320	break;	518	croak (0);
321		519
322	nreqs--;	520	if (!max_outstanding || max_outstanding > eio_nreqs ())
		521	return res;
323		522
324	if (req->type == REQ_QUIT)	523	poll_wait ();
325	started--;
326	else if (req->type == REQ_GROUP && req->grp_next != req)
327	{
328	req->fd = 1; /* mark request as delayed */
329	continue;
330	}
331	else
332	{
333	if (req->type == REQ_READ)
334	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
335
336	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
337	SvREADONLY_off (req->data);
338
339	if (req->statdata)
340	{
341	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
342	PL_laststatval = req->result;
343	PL_statcache = *(req->statdata);
344	}
345
346	req_invoke (req);
347
348	count++;
349	}
350
351	req_free (req);
352	}	524	}
353
354	return count;
355	}	525	}
356		526
357	static void *aio_proc(void *arg);
358
359	static void start_thread (void)	527	static void atfork_child (void)
360	{	528	{
361	sigset_t fullsigset, oldsigset;	529	create_respipe ();
362	pthread_t tid;
363	pthread_attr_t attr;
364
365	pthread_attr_init (&attr);
366	pthread_attr_setstacksize (&attr, STACKSIZE);
367	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
368
369	sigfillset (&fullsigset);
370	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
371
372	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
373	started++;
374
375	sigprocmask (SIG_SETMASK, &oldsigset, 0);
376	}	530	}
377		531
378	static void req_send (aio_req req)	532	static SV *
		533	get_cb (SV *cb_sv)
379	{	534	{
380	while (started < wanted && nreqs >= started)	535	HV *st;
381	start_thread ();	536	GV *gvp;
		537	CV *cv;
382		538
383	nreqs++;	539	if (!SvOK (cb_sv))
384
385	pthread_mutex_lock (&reqlock);
386
387	req->next = 0;
388
389	if (reqe)
390	{
391	reqe->next = req;
392	reqe = req;
393	}
394	else
395	reqe = reqs = req;
396
397	pthread_cond_signal (&reqwait);
398	pthread_mutex_unlock (&reqlock);
399
400	if (nreqs > max_outstanding)
401	for (;;)
402	{
403	poll_cb ();
404
405	if (nreqs <= max_outstanding)
406	break;
407
408	poll_wait ();
409	}
410	}
411
412	static void end_thread (void)
413	{
414	aio_req req;
415	Newz (0, req, 1, aio_cb);
416	req->type = REQ_QUIT;
417
418	req_send (req);
419	}
420
421	static void min_parallel (int nthreads)
422	{
423	if (wanted < nthreads)
424	wanted = nthreads;
425	}
426
427	static void max_parallel (int nthreads)
428	{
429	int cur = started;
430
431	if (wanted > nthreads)
432	wanted = nthreads;
433
434	while (cur > wanted)
435	{
436	end_thread ();
437	cur--;
438	}
439
440	while (started > wanted)
441	{
442	poll_wait ();
443	poll_cb ();
444	}
445	}
446
447	static void create_pipe ()
448	{
449	if (pipe (respipe))
450	croak ("unable to initialize result pipe");
451
452	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
453	croak ("cannot set result pipe to nonblocking mode");
454
455	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
456	croak ("cannot set result pipe to nonblocking mode");
457	}
458
459	/*****************************************************************************/
460	/* work around various missing functions */
461
462	#if !HAVE_PREADWRITE
463	# define pread aio_pread
464	# define pwrite aio_pwrite
465
466	/*
467	* make our pread/pwrite safe against themselves, but not against
468	* normal read/write by using a mutex. slows down execution a lot,
469	* but that's your problem, not mine.
470	*/
471	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
472
473	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
474	{
475	ssize_t res;
476	off_t ooffset;
477
478	pthread_mutex_lock (&preadwritelock);
479	ooffset = lseek (fd, 0, SEEK_CUR);
480	lseek (fd, offset, SEEK_SET);
481	res = read (fd, buf, count);
482	lseek (fd, ooffset, SEEK_SET);
483	pthread_mutex_unlock (&preadwritelock);
484
485	return res;
486	}
487
488	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
489	{
490	ssize_t res;
491	off_t ooffset;
492
493	pthread_mutex_lock (&preadwritelock);
494	ooffset = lseek (fd, 0, SEEK_CUR);
495	lseek (fd, offset, SEEK_SET);
496	res = write (fd, buf, count);
497	lseek (fd, offset, SEEK_SET);
498	pthread_mutex_unlock (&preadwritelock);
499
500	return res;
501	}
502	#endif
503
504	#if !HAVE_FDATASYNC
505	# define fdatasync fsync
506	#endif
507
508	#if !HAVE_READAHEAD
509	# define readahead aio_readahead
510
511	static ssize_t readahead (int fd, off_t offset, size_t count)
512	{
513	char readahead_buf[4096];
514
515	while (count > 0)
516	{
517	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
518
519	pread (fd, readahead_buf, len, offset);
520	offset += len;
521	count -= len;
522	}
523
524	errno = 0;
525	}
526	#endif
527
528	#if !HAVE_READDIR_R
529	# define readdir_r aio_readdir_r
530
531	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
532
533	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
534	{
535	struct dirent *e;
536	int errorno;
537
538	pthread_mutex_lock (&readdirlock);
539
540	e = readdir (dirp);
541	errorno = errno;
542
543	if (e)
544	{
545	*res = ent;
546	strcpy (ent->d_name, e->d_name);
547	}
548	else
549	*res = 0;
550
551	pthread_mutex_unlock (&readdirlock);
552
553	errno = errorno;
554	return e ? 0 : -1;
555	}
556	#endif
557
558	/* sendfile always needs emulation */
559	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
560	{
561	ssize_t res;
562
563	if (!count)
564	return 0;	540	return 0;
565		541
566	#if HAVE_SENDFILE	542	cv = sv_2cv (cb_sv, &st, &gvp, 0);
567	# if __linux
568	res = sendfile (ofd, ifd, &offset, count);
569		543
570	# elif __freebsd	544	if (!cv)
571	/*	545	croak ("IO::AIO callback must be undef or a CODE reference");
572	* Of course, the freebsd sendfile is a dire hack with no thoughts
573	* wasted on making it similar to other I/O functions.
574	*/
575	{
576	off_t sbytes;
577	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
578		546
579	if (res < 0 && sbytes)	547	return (SV *)cv;
580	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
581	res = sbytes;
582	}
583
584	# elif __hpux
585	res = sendfile (ofd, ifd, offset, count, 0, 0);
586
587	# elif __solaris
588	{
589	struct sendfilevec vec;
590	size_t sbytes;
591
592	vec.sfv_fd = ifd;
593	vec.sfv_flag = 0;
594	vec.sfv_off = offset;
595	vec.sfv_len = count;
596
597	res = sendfilev (ofd, &vec, 1, &sbytes);
598
599	if (res < 0 && sbytes)
600	res = sbytes;
601	}
602
603	# endif
604	#else
605	res = -1;
606	errno = ENOSYS;
607	#endif
608
609	if (res < 0
610	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
611	#if __solaris
612	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
613	#endif
614	)
615	)
616	{
617	/* emulate sendfile. this is a major pain in the ass */
618	char buf[4096];
619	res = 0;
620
621	while (count)
622	{
623	ssize_t cnt;
624
625	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
626
627	if (cnt <= 0)
628	{
629	if (cnt && !res) res = -1;
630	break;
631	}
632
633	cnt = write (ofd, buf, cnt);
634
635	if (cnt <= 0)
636	{
637	if (cnt && !res) res = -1;
638	break;
639	}
640
641	offset += cnt;
642	res += cnt;
643	count -= cnt;
644	}
645	}
646
647	return res;
648	}
649
650	/* read a full directory */
651	static int scandir_ (const char *path, void **namesp)
652	{
653	DIR *dirp = opendir (path);
654	union
655	{
656	struct dirent d;
657	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
658	} u;
659	struct dirent *entp;
660	char *name, *names;
661	int memlen = 4096;
662	int memofs = 0;
663	int res = 0;
664	int errorno;
665
666	if (!dirp)
667	return -1;
668
669	names = malloc (memlen);
670
671	for (;;)
672	{
673	errno = 0, readdir_r (dirp, &u.d, &entp);
674
675	if (!entp)
676	break;
677
678	name = entp->d_name;
679
680	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
681	{
682	int len = strlen (name) + 1;
683
684	res++;
685
686	while (memofs + len > memlen)
687	{
688	memlen *= 2;
689	names = realloc (names, memlen);
690	if (!names)
691	break;
692	}
693
694	memcpy (names + memofs, name, len);
695	memofs += len;
696	}
697	}
698
699	errorno = errno;
700	closedir (dirp);
701
702	if (errorno)
703	{
704	free (names);
705	errno = errorno;
706	res = -1;
707	}
708
709	*namesp = (void *)names;
710	return res;
711	}
712
713	/*****************************************************************************/
714
715	static void *aio_proc (void *thr_arg)
716	{
717	aio_req req;
718	int type;
719
720	do
721	{
722	pthread_mutex_lock (&reqlock);
723
724	for (;;)
725	{
726	req = reqs;
727
728	if (reqs)
729	{
730	reqs = reqs->next;
731	if (!reqs) reqe = 0;
732	}
733
734	if (req)
735	break;
736
737	pthread_cond_wait (&reqwait, &reqlock);
738	}
739
740	pthread_mutex_unlock (&reqlock);
741
742	errno = 0; /* strictly unnecessary */
743
744	if (!req->cancelled)
745	switch (req->type)
746	{
747	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
748	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
749
750	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
751	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
752
753	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
754	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
755	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
756
757	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
758	case REQ_CLOSE: req->result = close (req->fd); break;
759	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
760	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
761	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
762	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
763	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
764
765	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
766	case REQ_FSYNC: req->result = fsync (req->fd); break;
767	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
768
769	case REQ_SLEEP:
770	{
771	struct timeval tv;
772
773	tv.tv_sec = req->fd;
774	tv.tv_usec = req->fd2;
775
776	req->result = select (0, 0, 0, 0, &tv);
777	}
778
779	case REQ_QUIT:
780	break;
781
782	default:
783	req->result = ENOSYS;
784	break;
785	}
786
787	req->errorno = errno;
788
789	pthread_mutex_lock (&reslock);
790
791	req->next = 0;
792
793	if (rese)
794	{
795	rese->next = req;
796	rese = req;
797	}
798	else
799	{
800	rese = ress = req;
801
802	/* write a dummy byte to the pipe so fh becomes ready */
803	write (respipe [1], &respipe, 1);
804	}
805
806	pthread_mutex_unlock (&reslock);
807	}
808	while (type != REQ_QUIT);
809
810	return 0;
811	}
812
813	/*****************************************************************************/
814
815	static void atfork_prepare (void)
816	{
817	pthread_mutex_lock (&reqlock);
818	pthread_mutex_lock (&reslock);
819	#if !HAVE_PREADWRITE
820	pthread_mutex_lock (&preadwritelock);
821	#endif
822	#if !HAVE_READDIR_R
823	pthread_mutex_lock (&readdirlock);
824	#endif
825	}
826
827	static void atfork_parent (void)
828	{
829	#if !HAVE_READDIR_R
830	pthread_mutex_unlock (&readdirlock);
831	#endif
832	#if !HAVE_PREADWRITE
833	pthread_mutex_unlock (&preadwritelock);
834	#endif
835	pthread_mutex_unlock (&reslock);
836	pthread_mutex_unlock (&reqlock);
837	}
838
839	static void atfork_child (void)
840	{
841	aio_req prv;
842
843	started = 0;
844
845	while (reqs)
846	{
847	prv = reqs;
848	reqs = prv->next;
849	req_free (prv);
850	}
851
852	reqs = reqe = 0;
853
854	while (ress)
855	{
856	prv = ress;
857	ress = prv->next;
858	req_free (prv);
859	}
860
861	ress = rese = 0;
862
863	close (respipe [0]);
864	close (respipe [1]);
865	create_pipe ();
866
867	atfork_parent ();
868	}	548	}
869		549
870	#define dREQ \	550	#define dREQ \
		551	SV *cb_cv; \
871	aio_req req; \	552	aio_req req; \
		553	int req_pri = next_pri; \
		554	next_pri = EIO_PRI_DEFAULT; \
872	\	555	\
873	if (SvOK (callback) && !SvROK (callback)) \	556	cb_cv = get_cb (callback); \
874	croak ("callback must be undef or of reference type"); \
875	\	557	\
876	Newz (0, req, 1, aio_cb); \	558	Newz (0, req, 1, eio_req); \
877	if (!req) \	559	if (!req) \
878	croak ("out of memory during aio_req allocation"); \	560	croak ("out of memory during eio_req allocation"); \
879	\	561	\
880	req->callback = newSVsv (callback)	562	req->callback = SvREFCNT_inc (cb_cv); \
		563	req->pri = req_pri
881		564
882	#define REQ_SEND \	565	#define REQ_SEND \
		566	PUTBACK; \
883	req_send (req); \	567	req_submit (req); \
		568	SPAGAIN; \
884	\	569	\
885	if (GIMME_V != G_VOID) \	570	if (GIMME_V != G_VOID) \
886	XPUSHs (req_sv (req, AIO_REQ_KLASS));	571	XPUSHs (req_sv (req, AIO_REQ_KLASS));
887		572
		573	static int
		574	extract_fd (SV *fh, int wr)
		575	{
		576	int fd = PerlIO_fileno (wr ? IoOFP (sv_2io (fh)) : IoIFP (sv_2io (fh)));
		577
		578	if (fd < 0)
		579	croak ("illegal fh argument, either not an OS file or read/write mode mismatch");
		580
		581	return fd;
		582	}
		583
888	MODULE = IO::AIO PACKAGE = IO::AIO	584	MODULE = IO::AIO PACKAGE = IO::AIO
889		585
890	PROTOTYPES: ENABLE	586	PROTOTYPES: ENABLE
891		587
892	BOOT:	588	BOOT:
893	{	589	{
		590	static const struct {
		591	const char *name;
		592	IV iv;
		593	} *civ, const_iv[] = {
		594	# define const_iv(name, value) { # name, (IV) value },
		595	# define const_eio(name) { # name, (IV) EIO_ ## name },
		596	const_iv (EXDEV , EXDEV)
		597	const_iv (ENOSYS , ENOSYS)
		598	const_iv (O_RDONLY, O_RDONLY)
		599	const_iv (O_WRONLY, O_WRONLY)
		600	const_iv (O_CREAT , O_CREAT)
		601	const_iv (O_TRUNC , O_TRUNC)
		602	#ifndef _WIN32
		603	const_iv (S_IFIFO , S_IFIFO)
		604	#endif
		605	const_iv (FADV_NORMAL , POSIX_FADV_NORMAL)
		606	const_iv (FADV_SEQUENTIAL, POSIX_FADV_SEQUENTIAL)
		607	const_iv (FADV_RANDOM , POSIX_FADV_RANDOM)
		608	const_iv (FADV_NOREUSE , POSIX_FADV_NOREUSE)
		609	const_iv (FADV_WILLNEED , POSIX_FADV_WILLNEED)
		610	const_iv (FADV_DONTNEED , POSIX_FADV_DONTNEED)
		611
		612	const_eio (SYNC_FILE_RANGE_WAIT_BEFORE)
		613	const_eio (SYNC_FILE_RANGE_WRITE)
		614	const_eio (SYNC_FILE_RANGE_WAIT_AFTER)
		615
		616	const_eio (READDIR_DENTS)
		617	const_eio (READDIR_DIRS_FIRST)
		618	const_eio (READDIR_STAT_ORDER)
		619	const_eio (READDIR_FOUND_UNKNOWN)
		620
		621	const_eio (DT_UNKNOWN)
		622	const_eio (DT_FIFO)
		623	const_eio (DT_CHR)
		624	const_eio (DT_DIR)
		625	const_eio (DT_BLK)
		626	const_eio (DT_REG)
		627	const_eio (DT_LNK)
		628	const_eio (DT_SOCK)
		629	const_eio (DT_WHT)
		630	};
		631
894	HV *stash = gv_stashpv ("IO::AIO", 1);	632	stash = gv_stashpv ("IO::AIO", 1);
895	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
896	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
897	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
898		633
		634	for (civ = const_iv + sizeof (const_iv) / sizeof (const_iv [0]); civ-- > const_iv; )
		635	newCONSTSUB (stash, (char *)civ->name, newSViv (civ->iv));
		636
899	create_pipe ();	637	create_respipe ();
900	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
901	}
902		638
		639	if (eio_init (want_poll, done_poll) < 0)
		640	croak ("IO::AIO: unable to initialise eio library");
		641
		642	/* atfork child called in fifo order, so before eio's handler */
		643	X_THREAD_ATFORK (0, 0, atfork_child);
		644	}
		645
903	void	646	void
904	min_parallel (nthreads)	647	max_poll_reqs (int nreqs)
905	int nthreads
906	PROTOTYPE: $	648	PROTOTYPE: $
		649	CODE:
		650	eio_set_max_poll_reqs (nreqs);
907		651
908	void	652	void
909	max_parallel (nthreads)	653	max_poll_time (double nseconds)
910	int nthreads
911	PROTOTYPE: $	654	PROTOTYPE: $
912
913	int
914	max_outstanding (nreqs)
915	int nreqs
916	PROTOTYPE: $
917	CODE:	655	CODE:
918	RETVAL = max_outstanding;	656	eio_set_max_poll_time (nseconds);
		657
		658	void
		659	min_parallel (int nthreads)
		660	PROTOTYPE: $
		661	CODE:
		662	eio_set_min_parallel (nthreads);
		663
		664	void
		665	max_parallel (int nthreads)
		666	PROTOTYPE: $
		667	CODE:
		668	eio_set_max_parallel (nthreads);
		669
		670	void
		671	max_idle (int nthreads)
		672	PROTOTYPE: $
		673	CODE:
		674	eio_set_max_idle (nthreads);
		675
		676	void
		677	max_outstanding (int maxreqs)
		678	PROTOTYPE: $
		679	CODE:
919	max_outstanding = nreqs;	680	max_outstanding = maxreqs;
920		681
921	void	682	void
922	aio_open (pathname,flags,mode,callback=&PL_sv_undef)	683	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
923	SV * pathname
924	int flags
925	int mode
926	SV * callback
927	PROTOTYPE: $$$;$	684	PROTOTYPE: $$$;$
928	PPCODE:	685	PPCODE:
929	{	686	{
930	dREQ;	687	dREQ;
931		688
932	req->type = REQ_OPEN;	689	req->type = EIO_OPEN;
933	req->data = newSVsv (pathname);	690	req->sv1 = newSVsv (pathname);
934	req->dataptr = SvPVbyte_nolen (req->data);	691	req->ptr1 = SvPVbyte_nolen (req->sv1);
935	req->fd = flags;	692	req->int1 = flags;
936	req->mode = mode;	693	req->int2 = mode;
937		694
938	REQ_SEND;	695	REQ_SEND;
939	}	696	}
940		697
941	void	698	void
942	aio_close (fh,callback=&PL_sv_undef)	699	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
943	SV * fh
944	SV * callback
945	PROTOTYPE: $;$	700	PROTOTYPE: $;$
946	ALIAS:	701	ALIAS:
947	aio_close = REQ_CLOSE
948	aio_fsync = REQ_FSYNC	702	aio_fsync = EIO_FSYNC
949	aio_fdatasync = REQ_FDATASYNC	703	aio_fdatasync = EIO_FDATASYNC
950	PPCODE:	704	PPCODE:
951	{	705	{
		706	int fd = extract_fd (fh, 0);
952	dREQ;	707	dREQ;
953		708
954	req->type = ix;	709	req->type = ix;
955	req->fh = newSVsv (fh);	710	req->sv1 = newSVsv (fh);
956	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	711	req->int1 = fd;
957		712
958	REQ_SEND (req);	713	REQ_SEND (req);
959	}	714	}
960		715
961	void	716	void
		717	aio_sync_file_range (SV *fh, off_t offset, size_t nbytes, UV flags, SV *callback=&PL_sv_undef)
		718	PROTOTYPE: $$$$;$
		719	PPCODE:
		720	{
		721	int fd = extract_fd (fh, 0);
		722	dREQ;
		723
		724	req->type = EIO_SYNC_FILE_RANGE;
		725	req->sv1 = newSVsv (fh);
		726	req->int1 = fd;
		727	req->offs = offset;
		728	req->size = nbytes;
		729	req->int2 = flags;
		730
		731	REQ_SEND (req);
		732	}
		733
		734	void
		735	aio_close (SV *fh, SV *callback=&PL_sv_undef)
		736	PROTOTYPE: $;$
		737	PPCODE:
		738	{
		739	static int close_pipe = -1; /* dummy fd to close fds via dup2 */
		740	int fd = extract_fd (fh, 0);
		741	dREQ;
		742
		743	if (close_pipe < 0)
		744	{
		745	int pipefd [2];
		746
		747	if (pipe (pipefd) < 0
		748	|| close (pipefd [1]) < 0
		749	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
		750	abort (); /*D*/
		751
		752	close_pipe = pipefd [0];
		753	}
		754
		755	req->type = EIO_DUP2;
		756	req->int1 = close_pipe;
		757	req->sv2 = newSVsv (fh);
		758	req->int2 = fd;
		759
		760	REQ_SEND (req);
		761	}
		762
		763	void
962	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	764	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
963	SV * fh
964	UV offset
965	UV length
966	SV * data
967	UV dataoffset
968	SV * callback
969	ALIAS:	765	ALIAS:
970	aio_read = REQ_READ	766	aio_read = EIO_READ
971	aio_write = REQ_WRITE	767	aio_write = EIO_WRITE
972	PROTOTYPE: $$$$$;$	768	PROTOTYPE: $$$$$;$
973	PPCODE:	769	PPCODE:
974	{	770	{
975	aio_req req;
976	STRLEN svlen;	771	STRLEN svlen;
		772	int fd = extract_fd (fh, ix == EIO_WRITE);
977	char *svptr = SvPVbyte (data, svlen);	773	char *svptr = SvPVbyte (data, svlen);
978		774	UV len = SvUV (length);
979	SvUPGRADE (data, SVt_PV);
980	SvPOK_on (data);
981		775
982	if (dataoffset < 0)	776	if (dataoffset < 0)
983	dataoffset += svlen;	777	dataoffset += svlen;
984		778
985	if (dataoffset < 0 || dataoffset > svlen)	779	if (dataoffset < 0 || dataoffset > svlen)
986	croak ("data offset outside of string");	780	croak ("dataoffset outside of data scalar");
987		781
988	if (ix == REQ_WRITE)	782	if (ix == EIO_WRITE)
989	{	783	{
990	/* write: check length and adjust. */	784	/* write: check length and adjust. */
991	if (length < 0 || length + dataoffset > svlen)	785	if (!SvOK (length) || len + dataoffset > svlen)
992	length = svlen - dataoffset;	786	len = svlen - dataoffset;
993	}	787	}
994	else	788	else
995	{	789	{
996	/* read: grow scalar as necessary */	790	/* read: check type and grow scalar as necessary */
		791	SvUPGRADE (data, SVt_PV);
997	svptr = SvGROW (data, length + dataoffset);	792	svptr = SvGROW (data, len + dataoffset + 1);
998	}	793	}
999
1000	if (length < 0)
1001	croak ("length must not be negative");
1002		794
1003	{	795	{
1004	dREQ;	796	dREQ;
1005		797
1006	req->type = ix;	798	req->type = ix;
1007	req->fh = newSVsv (fh);	799	req->sv1 = newSVsv (fh);
1008	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	800	req->int1 = fd;
1009	: IoOFP (sv_2io (fh)));	801	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
1010	req->offset = offset;	802	req->size = len;
1011	req->length = length;
1012	req->data = SvREFCNT_inc (data);	803	req->sv2 = SvREFCNT_inc (data);
1013	req->dataptr = (char *)svptr + dataoffset;	804	req->ptr2 = (char *)svptr + dataoffset;
		805	req->stroffset = dataoffset;
1014		806
1015	if (!SvREADONLY (data))	807	if (!SvREADONLY (data))
1016	{	808	{
1017	SvREADONLY_on (data);	809	SvREADONLY_on (data);
1018	req->data2ptr = (void *)data;	810	req->flags |= FLAG_SV2_RO_OFF;
1019	}	811	}
1020		812
1021	REQ_SEND;	813	REQ_SEND;
1022	}	814	}
1023	}	815	}
1024		816
1025	void	817	void
		818	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		819	PROTOTYPE: $$;$
		820	PPCODE:
		821	{
		822	SV *data;
		823	dREQ;
		824
		825	req->type = EIO_READLINK;
		826	req->sv1 = newSVsv (path);
		827	req->ptr1 = SvPVbyte_nolen (req->sv1);
		828
		829	REQ_SEND;
		830	}
		831
		832	void
1026	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	833	aio_sendfile (SV *out_fh, SV *in_fh, off_t in_offset, size_t length, SV *callback=&PL_sv_undef)
1027	SV * out_fh
1028	SV * in_fh
1029	UV in_offset
1030	UV length
1031	SV * callback
1032	PROTOTYPE: $$$$;$	834	PROTOTYPE: $$$$;$
1033	PPCODE:	835	PPCODE:
1034	{	836	{
		837	int ifd = extract_fd (in_fh , 0);
		838	int ofd = extract_fd (out_fh, 0);
1035	dREQ;	839	dREQ;
1036		840
1037	req->type = REQ_SENDFILE;	841	req->type = EIO_SENDFILE;
1038	req->fh = newSVsv (out_fh);	842	req->sv1 = newSVsv (out_fh);
1039	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	843	req->int1 = ofd;
1040	req->fh2 = newSVsv (in_fh);	844	req->sv2 = newSVsv (in_fh);
1041	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	845	req->int2 = ifd;
1042	req->offset = in_offset;	846	req->offs = in_offset;
1043	req->length = length;	847	req->size = length;
1044		848
1045	REQ_SEND;	849	REQ_SEND;
1046	}	850	}
1047		851
1048	void	852	void
1049	aio_readahead (fh,offset,length,callback=&PL_sv_undef)	853	aio_readahead (SV *fh, off_t offset, size_t length, SV *callback=&PL_sv_undef)
1050	SV * fh
1051	UV offset
1052	IV length
1053	SV * callback
1054	PROTOTYPE: $$$;$	854	PROTOTYPE: $$$;$
1055	PPCODE:	855	PPCODE:
1056	{	856	{
		857	int fd = extract_fd (fh, 0);
1057	dREQ;	858	dREQ;
1058		859
1059	req->type = REQ_READAHEAD;	860	req->type = EIO_READAHEAD;
1060	req->fh = newSVsv (fh);	861	req->sv1 = newSVsv (fh);
1061	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	862	req->int1 = fd;
1062	req->offset = offset;	863	req->offs = offset;
1063	req->length = length;	864	req->size = length;
1064		865
1065	REQ_SEND;	866	REQ_SEND;
1066	}	867	}
1067		868
1068	void	869	void
1069	aio_stat (fh_or_path,callback=&PL_sv_undef)	870	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
1070	SV * fh_or_path
1071	SV * callback
1072	ALIAS:	871	ALIAS:
1073	aio_stat = REQ_STAT	872	aio_stat = EIO_STAT
1074	aio_lstat = REQ_LSTAT	873	aio_lstat = EIO_LSTAT
1075	PPCODE:	874	PPCODE:
1076	{	875	{
1077	dREQ;	876	dREQ;
1078		877
1079	New (0, req->statdata, 1, Stat_t);	878	req->sv1 = newSVsv (fh_or_path);
1080	if (!req->statdata)
1081	{
1082	req_free (req);
1083	croak ("out of memory during aio_req->statdata allocation");
1084	}
1085		879
1086	if (SvPOK (fh_or_path))	880	if (SvPOK (req->sv1))
1087	{	881	{
1088	req->type = ix;	882	req->type = ix;
1089	req->data = newSVsv (fh_or_path);
1090	req->dataptr = SvPVbyte_nolen (req->data);	883	req->ptr1 = SvPVbyte_nolen (req->sv1);
1091	}	884	}
1092	else	885	else
1093	{	886	{
1094	req->type = REQ_FSTAT;	887	req->type = EIO_FSTAT;
1095	req->fh = newSVsv (fh_or_path);
1096	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	888	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
1097	}	889	}
1098		890
1099	REQ_SEND;	891	REQ_SEND;
1100	}	892	}
1101		893
1102	void	894	void
		895	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		896	PPCODE:
		897	{
		898	dREQ;
		899
		900	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		901	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		902	req->sv1 = newSVsv (fh_or_path);
		903
		904	if (SvPOK (req->sv1))
		905	{
		906	req->type = EIO_UTIME;
		907	req->ptr1 = SvPVbyte_nolen (req->sv1);
		908	}
		909	else
		910	{
		911	req->type = EIO_FUTIME;
		912	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		913	}
		914
		915	REQ_SEND;
		916	}
		917
		918	void
		919	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		920	PPCODE:
		921	{
		922	dREQ;
		923
		924	req->sv1 = newSVsv (fh_or_path);
		925	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		926
		927	if (SvPOK (req->sv1))
		928	{
		929	req->type = EIO_TRUNCATE;
		930	req->ptr1 = SvPVbyte_nolen (req->sv1);
		931	}
		932	else
		933	{
		934	req->type = EIO_FTRUNCATE;
		935	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		936	}
		937
		938	REQ_SEND;
		939	}
		940
		941	void
		942	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		943	ALIAS:
		944	aio_chmod = EIO_CHMOD
		945	aio_mkdir = EIO_MKDIR
		946	PPCODE:
		947	{
		948	dREQ;
		949
		950	req->int2 = mode;
		951	req->sv1 = newSVsv (fh_or_path);
		952
		953	if (SvPOK (req->sv1))
		954	{
		955	req->type = ix;
		956	req->ptr1 = SvPVbyte_nolen (req->sv1);
		957	}
		958	else
		959	{
		960	req->type = EIO_FCHMOD;
		961	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		962	}
		963
		964	REQ_SEND;
		965	}
		966
		967	void
		968	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		969	PPCODE:
		970	{
		971	dREQ;
		972
		973	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		974	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		975	req->sv1 = newSVsv (fh_or_path);
		976
		977	if (SvPOK (req->sv1))
		978	{
		979	req->type = EIO_CHOWN;
		980	req->ptr1 = SvPVbyte_nolen (req->sv1);
		981	}
		982	else
		983	{
		984	req->type = EIO_FCHOWN;
		985	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		986	}
		987
		988	REQ_SEND;
		989	}
		990
		991	void
		992	aio_readdirx (SV8 *pathname, IV flags, SV *callback=&PL_sv_undef)
		993	PPCODE:
		994	{
		995	dREQ;
		996
		997	req->type = EIO_READDIR;
		998	req->sv1 = newSVsv (pathname);
		999	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1000	req->int1 = flags | EIO_READDIR_DENTS | EIO_READDIR_CUSTOM1;
		1001
		1002	if (flags & EIO_READDIR_DENTS)
		1003	req->int1 |= EIO_READDIR_CUSTOM2;
		1004
		1005	REQ_SEND;
		1006	}
		1007
		1008	void
1103	aio_unlink (pathname,callback=&PL_sv_undef)	1009	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
1104	SV * pathname
1105	SV * callback
1106	ALIAS:	1010	ALIAS:
1107	aio_unlink = REQ_UNLINK	1011	aio_unlink = EIO_UNLINK
1108	aio_rmdir = REQ_RMDIR	1012	aio_rmdir = EIO_RMDIR
1109	aio_readdir = REQ_READDIR	1013	aio_readdir = EIO_READDIR
1110	PPCODE:	1014	PPCODE:
1111	{	1015	{
1112	dREQ;	1016	dREQ;
1113		1017
1114	req->type = ix;	1018	req->type = ix;
1115	req->data = newSVsv (pathname);	1019	req->sv1 = newSVsv (pathname);
1116	req->dataptr = SvPVbyte_nolen (req->data);	1020	req->ptr1 = SvPVbyte_nolen (req->sv1);
1117		1021
1118	REQ_SEND;	1022	REQ_SEND;
1119	}	1023	}
1120		1024
1121	void	1025	void
1122	aio_link (oldpath,newpath,callback=&PL_sv_undef)	1026	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
1123	SV * oldpath
1124	SV * newpath
1125	SV * callback
1126	ALIAS:	1027	ALIAS:
1127	aio_link = REQ_LINK	1028	aio_link = EIO_LINK
1128	aio_symlink = REQ_SYMLINK	1029	aio_symlink = EIO_SYMLINK
1129	aio_rename = REQ_RENAME	1030	aio_rename = EIO_RENAME
1130	PPCODE:	1031	PPCODE:
1131	{	1032	{
1132	dREQ;	1033	dREQ;
1133		1034
1134	req->type = ix;	1035	req->type = ix;
1135	req->fh = newSVsv (oldpath);	1036	req->sv1 = newSVsv (oldpath);
1136	req->data2ptr = SvPVbyte_nolen (req->fh);	1037	req->ptr1 = SvPVbyte_nolen (req->sv1);
1137	req->data = newSVsv (newpath);	1038	req->sv2 = newSVsv (newpath);
1138	req->dataptr = SvPVbyte_nolen (req->data);	1039	req->ptr2 = SvPVbyte_nolen (req->sv2);
1139		1040
1140	REQ_SEND;	1041	REQ_SEND;
1141	}	1042	}
1142		1043
1143	void	1044	void
1144	aio_sleep (delay,callback=&PL_sv_undef)	1045	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
1145	double delay
1146	SV * callback
1147	PPCODE:	1046	PPCODE:
1148	{	1047	{
1149	dREQ;	1048	dREQ;
1150		1049
1151	req->type = REQ_SLEEP;	1050	req->type = EIO_MKNOD;
1152	req->fd = delay < 0. ? 0 : delay;	1051	req->sv1 = newSVsv (pathname);
1153	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);	1052	req->ptr1 = SvPVbyte_nolen (req->sv1);
1154		1053	req->int2 = (mode_t)mode;
		1054	req->offs = dev;
		1055
1155	REQ_SEND;	1056	REQ_SEND;
1156	}	1057	}
1157		1058
1158	void	1059	void
		1060	aio_busy (double delay, SV *callback=&PL_sv_undef)
		1061	PPCODE:
		1062	{
		1063	dREQ;
		1064
		1065	req->type = EIO_BUSY;
		1066	req->nv1 = delay < 0. ? 0. : delay;
		1067
		1068	REQ_SEND;
		1069	}
		1070
		1071	void
1159	aio_group (callback=&PL_sv_undef)	1072	aio_group (SV *callback=&PL_sv_undef)
1160	SV * callback
1161	PROTOTYPE: ;$	1073	PROTOTYPE: ;$
1162	PPCODE:	1074	PPCODE:
1163	{	1075	{
1164	dREQ;	1076	dREQ;
		1077
1165	req->type = REQ_GROUP;	1078	req->type = EIO_GROUP;
1166	req->grp_next = req;
1167	req->grp_prev = req;
1168		1079
1169	req_send (req);	1080	req_submit (req);
1170	XPUSHs (req_sv (req, AIO_GRP_KLASS));	1081	XPUSHs (req_sv (req, AIO_GRP_KLASS));
1171	}	1082	}
		1083
		1084	void
		1085	aio_nop (SV *callback=&PL_sv_undef)
		1086	ALIAS:
		1087	aio_nop = EIO_NOP
		1088	aio_sync = EIO_SYNC
		1089	PPCODE:
		1090	{
		1091	dREQ;
		1092
		1093	req->type = ix;
		1094
		1095	REQ_SEND;
		1096	}
		1097
		1098	int
		1099	aioreq_pri (int pri = 0)
		1100	PROTOTYPE: ;$
		1101	CODE:
		1102	RETVAL = next_pri;
		1103	if (items > 0)
		1104	{
		1105	if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
		1106	if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
		1107	next_pri = pri;
		1108	}
		1109	OUTPUT:
		1110	RETVAL
		1111
		1112	void
		1113	aioreq_nice (int nice = 0)
		1114	CODE:
		1115	nice = next_pri - nice;
		1116	if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
		1117	if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
		1118	next_pri = nice;
1172		1119
1173	void	1120	void
1174	flush ()	1121	flush ()
1175	PROTOTYPE:	1122	PROTOTYPE:
1176	CODE:	1123	CODE:
1177	while (nreqs)	1124	while (eio_nreqs ())
1178	{	1125	{
1179	poll_wait ();	1126	poll_wait ();
1180	poll_cb ();	1127	poll_cb ();
1181	}	1128	}
1182		1129
1183	void	1130	int
1184	poll()	1131	poll()
1185	PROTOTYPE:	1132	PROTOTYPE:
1186	CODE:	1133	CODE:
1187	if (nreqs)
1188	{
1189	poll_wait ();	1134	poll_wait ();
1190	poll_cb ();	1135	RETVAL = poll_cb ();
1191	}	1136	OUTPUT:
		1137	RETVAL
1192		1138
1193	int	1139	int
1194	poll_fileno()	1140	poll_fileno()
1195	PROTOTYPE:	1141	PROTOTYPE:
1196	CODE:	1142	CODE:
…		…
1208		1154
1209	void	1155	void
1210	poll_wait()	1156	poll_wait()
1211	PROTOTYPE:	1157	PROTOTYPE:
1212	CODE:	1158	CODE:
1213	if (nreqs)
1214	poll_wait ();	1159	poll_wait ();
1215		1160
1216	int	1161	int
1217	nreqs()	1162	nreqs()
1218	PROTOTYPE:	1163	PROTOTYPE:
1219	CODE:	1164	CODE:
1220	RETVAL = nreqs;	1165	RETVAL = eio_nreqs ();
1221	OUTPUT:	1166	OUTPUT:
1222	RETVAL	1167	RETVAL
1223		1168
		1169	int
		1170	nready()
		1171	PROTOTYPE:
		1172	CODE:
		1173	RETVAL = eio_nready ();
		1174	OUTPUT:
		1175	RETVAL
		1176
		1177	int
		1178	npending()
		1179	PROTOTYPE:
		1180	CODE:
		1181	RETVAL = eio_npending ();
		1182	OUTPUT:
		1183	RETVAL
		1184
		1185	int
		1186	nthreads()
		1187	PROTOTYPE:
		1188	CODE:
		1189	RETVAL = eio_nthreads ();
		1190	OUTPUT:
		1191	RETVAL
		1192
		1193	int
		1194	fadvise (aio_rfd fh, off_t offset, off_t length, IV advice)
		1195	PROTOTYPE: $$$$
		1196	CODE:
		1197	{
		1198	#if _XOPEN_SOURCE >= 600
		1199	RETVAL = posix_fadvise (fh, offset, length, advice);
		1200	#else
		1201	RETVAL = errno = ENOSYS;
		1202	#endif
		1203	}
		1204	OUTPUT:
		1205	RETVAL
		1206
		1207	ssize_t
		1208	sendfile (aio_wfd ofh, aio_rfd ifh, off_t offset, size_t count)
		1209	PROTOTYPE: $$$$
		1210	CODE:
		1211	eio_sendfile_sync (ofh, ifh, offset, count);
		1212
		1213	void _on_next_submit (SV *cb)
		1214	CODE:
		1215	SvREFCNT_dec (on_next_submit);
		1216	on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
		1217
1224	PROTOTYPES: DISABLE	1218	PROTOTYPES: DISABLE
1225		1219
1226	MODULE = IO::AIO PACKAGE = IO::AIO::REQ	1220	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
1227		1221
1228	void	1222	void
1229	cancel (aio_req_ornot req)	1223	cancel (aio_req_ornot req)
1230	PROTOTYPE:
1231	CODE:	1224	CODE:
1232	req_cancel (req);	1225	eio_cancel (req);
		1226
		1227	void
		1228	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1229	PPCODE:
		1230	{
		1231	if (GIMME_V != G_VOID)
		1232	XPUSHs (req->callback ? sv_2mortal (newRV_inc (req->callback)) : &PL_sv_undef);
		1233
		1234	if (items > 1)
		1235	{
		1236	SV *cb_cv = get_cb (callback);
		1237
		1238	SvREFCNT_dec (req->callback);
		1239	req->callback = SvREFCNT_inc (cb_cv);
		1240	}
		1241	}
1233		1242
1234	MODULE = IO::AIO PACKAGE = IO::AIO::GRP	1243	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
1235		1244
1236	void	1245	void
1237	add (aio_req grp, ...)	1246	add (aio_req grp, ...)
1238	PPCODE:	1247	PPCODE:
1239	{	1248	{
1240	int i;	1249	int i;
1241		1250
		1251	if (grp->int1 == 2)
		1252	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1253
1242	for (i = 1; i < items; ++i )	1254	for (i = 1; i < items; ++i )
1243	{	1255	{
		1256	aio_req req;
		1257
1244	if (GIMME_V != G_VOID)	1258	if (GIMME_V != G_VOID)
1245	XPUSHs (sv_2mortal (newSVsv (ST (i))));	1259	XPUSHs (sv_2mortal (newSVsv (ST (i))));
1246		1260
1247	aio_req req = SvAIO_REQ (ST (i));	1261	req = SvAIO_REQ (ST (i));
1248		1262
1249	if (req)	1263	if (req)
1250	{	1264	eio_grp_add (grp, req);
1251	req->grp_prev = grp;
1252	req->grp_next = grp->grp_next;
1253	grp->grp_next->grp_prev = req;
1254	grp->grp_next = req;
1255
1256	req->grp = grp;
1257	}	1265	}
1258	}
1259	}	1266	}
		1267
		1268	void
		1269	cancel_subs (aio_req_ornot req)
		1270	CODE:
		1271	req_cancel_subs (req);
1260		1272
1261	void	1273	void
1262	result (aio_req grp, ...)	1274	result (aio_req grp, ...)
1263	CODE:	1275	CODE:
1264	{	1276	{
1265	int i;	1277	int i;
1266	AV *av = newAV ();	1278	AV *av;
1267		1279
1268	if (grp->data)	1280	grp->errorno = errno;
1269	SvREFCNT_dec (grp->data);
1270		1281
		1282	av = newAV ();
		1283	av_extend (av, items - 1);
		1284
1271	for (i = 1; i < items; ++i )	1285	for (i = 1; i < items; ++i )
1272	av_push (av, newSVsv (ST (i)));	1286	av_push (av, newSVsv (ST (i)));
1273		1287
		1288	SvREFCNT_dec (grp->sv1);
1274	grp->data = (SV *)av;	1289	grp->sv1 = (SV *)av;
1275	}	1290	}
1276		1291
		1292	void
		1293	errno (aio_req grp, int errorno = errno)
		1294	CODE:
		1295	grp->errorno = errorno;
		1296
		1297	void
		1298	limit (aio_req grp, int limit)
		1299	CODE:
		1300	eio_grp_limit (grp, limit);
		1301
		1302	void
		1303	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1304	CODE:
		1305	{
		1306	SvREFCNT_dec (grp->sv2);
		1307	grp->sv2 = newSVsv (callback);
		1308	grp->feed = aio_grp_feed;
		1309
		1310	if (grp->int2 <= 0)
		1311	grp->int2 = 2;
		1312
		1313	eio_grp_limit (grp, grp->int2);
		1314	}
		1315

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