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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.27 by root, Wed Aug 17 04:47:02 2005 UTC vs.
Revision 1.173 by root, Mon Sep 13 01:59:05 2010 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	#include "schmorp.h"
9		10
		11	#include <stddef.h>
		12	#include <stdlib.h>
		13	#include <errno.h>
10	#include <sys/types.h>	14	#include <sys/types.h>
11	#include <sys/stat.h>	15	#include <sys/stat.h>
12		16	#include <sys/statvfs.h>
13	#include <unistd.h>	17	#include <limits.h>
14	#include <fcntl.h>	18	#include <fcntl.h>
15	#include <signal.h>
16	#include <sched.h>	19	#include <sched.h>
17		20
18	#include <pthread.h>	21	#if _POSIX_MEMLOCK || _POSIX_MAPPED_FILES
		22	# include <sys/mman.h>
		23	#endif
19		24
20	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	25	/* perl namespace pollution */
21	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	26	#undef VERSION
22	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
23		27
24	#if __ia64	28	#ifdef _WIN32
25	# define STACKSIZE 65536	29
		30	# define EIO_STRUCT_DIRENT Direntry_t
		31	# undef malloc
		32	# undef free
		33
		34	// perl overrides all those nice win32 functions
		35	# undef open
		36	# undef read
		37	# undef write
		38	# undef send
		39	# undef recv
		40	# undef stat
		41	# undef fstat
		42	# define lstat stat
		43	# undef truncate
		44	# undef ftruncate
		45	# undef open
		46	# undef close
		47	# undef unlink
		48	# undef rmdir
		49	# undef rename
		50	# undef lseek
		51
		52	# define chown(a,b,c) (errno = ENOSYS, -1)
		53	# define fchown(a,b,c) (errno = ENOSYS, -1)
		54	# define fchmod(a,b) (errno = ENOSYS, -1)
		55	# define symlink(a,b) (errno = ENOSYS, -1)
		56	# define readlink(a,b,c) (errno = ENOSYS, -1)
		57	# define mknod(a,b,c) (errno = ENOSYS, -1)
		58	# define truncate(a,b) (errno = ENOSYS, -1)
		59	# define ftruncate(fd,o) chsize ((fd), (o))
		60	# define fsync(fd) _commit (fd)
		61	# define opendir(fd) (errno = ENOSYS, 0)
		62	# define readdir(fd) (errno = ENOSYS, -1)
		63	# define closedir(fd) (errno = ENOSYS, -1)
		64	# define mkdir(a,b) mkdir (a)
		65
26	#else	66	#else
27	# define STACKSIZE 4096	67
		68	# include <sys/time.h>
		69	# include <sys/select.h>
		70	# include <unistd.h>
		71	# include <utime.h>
		72	# include <signal.h>
		73	# define EIO_STRUCT_DIRENT struct dirent
		74
		75	#endif
		76
		77	/* perl stupidly overrides readdir and maybe others */
		78	/* with thread-unsafe versions, imagine that :( */
		79	#undef readdir
		80	#undef opendir
		81	#undef closedir
		82
		83	#define EIO_STRUCT_STAT Stat_t
		84
		85	/* use NV for 32 bit perls as it allows larger offsets */
		86	#if IVSIZE >= 8
		87	# define VAL64 IV
		88	# define SvVAL64 SvIV
		89	# define newSVval64 newSViv
		90	#else
		91	# define VAL64 NV
		92	# define SvVAL64 SvNV
		93	# define newSVval64 newSVnv
		94	#endif
		95
		96	/*****************************************************************************/
		97
		98	#if __GNUC__ >= 3
		99	# define expect(expr,value) __builtin_expect ((expr),(value))
		100	#else
		101	# define expect(expr,value) (expr)
		102	#endif
		103
		104	#define expect_false(expr) expect ((expr) != 0, 0)
		105	#define expect_true(expr) expect ((expr) != 0, 1)
		106
		107	/*****************************************************************************/
		108
		109	typedef SV SV8; /* byte-sv, used for argument-checking */
		110	typedef int aio_rfd; /* read file desriptor */
		111	typedef int aio_wfd; /* write file descriptor */
		112
		113	static HV *aio_stash, *aio_req_stash, *aio_grp_stash;
		114
		115	#define EIO_REQ_MEMBERS \
		116	SV *callback; \
		117	SV *sv1, *sv2; \
		118	STRLEN stroffset; \
		119	SV *self;
		120
		121	#define EIO_NO_WRAPPERS 1
		122
		123	#include "libeio/eio.h"
		124
		125	#ifndef POSIX_FADV_NORMAL
		126	# define POSIX_FADV_NORMAL 0
		127	# define NO_FADVISE 1
		128	#endif
		129	#ifndef POSIX_FADV_SEQUENTIAL
		130	# define POSIX_FADV_SEQUENTIAL 0
		131	#endif
		132	#ifndef POSIX_FADV_RANDOM
		133	# define POSIX_FADV_RANDOM 0
		134	#endif
		135	#ifndef POSIX_FADV_NOREUSE
		136	# define POSIX_FADV_NOREUSE 0
		137	#endif
		138	#ifndef POSIX_FADV_WILLNEED
		139	# define POSIX_FADV_WILLNEED 0
		140	#endif
		141	#ifndef POSIX_FADV_DONTNEED
		142	# define POSIX_FADV_DONTNEED 0
		143	#endif
		144
		145	#if _XOPEN_SOURCE < 600 || NO_FADVISE
		146	# define posix_fadvise(a,b,c,d) errno = ENOSYS /* also return ENOSYS */
		147	#endif
		148
		149	#ifndef POSIX_MADV_NORMAL
		150	# define POSIX_MADV_NORMAL 0
		151	# define NO_MADVISE 1
		152	#endif
		153	#ifndef POSIX_MADV_SEQUENTIAL
		154	# define POSIX_MADV_SEQUENTIAL 0
		155	#endif
		156	#ifndef POSIX_MADV_RANDOM
		157	# define POSIX_MADV_RANDOM 0
		158	#endif
		159	#ifndef POSIX_MADV_WILLNEED
		160	# define POSIX_MADV_WILLNEED 0
		161	#endif
		162	#ifndef POSIX_MADV_DONTNEED
		163	# define POSIX_MADV_DONTNEED 0
		164	#endif
		165
		166	#if _XOPEN_SOURCE < 600 || NO_MADVISE
		167	# define posix_madvise(a,b,c) errno = ENOSYS /* also return ENOSYS */
		168	#endif
		169
		170	#ifndef PROT_NONE
		171	# define PROT_NONE 0
		172	#endif
		173	#ifndef PROT_READ
		174	# define PROT_READ 0
		175	#endif
		176	#ifndef PROT_WRITE
		177	# define PROT_READ 0
		178	#endif
		179	#ifndef PROT_EXEC
		180	# define PROT_EXEC 0
		181	#endif
		182
		183	#ifndef ST_NODEV
		184	# define ST_NODEV 0
		185	#endif
		186	#ifndef ST_NOEXEC
		187	# define ST_NOEXEC 0
		188	#endif
		189	#ifndef ST_SYNCHRONOUS
		190	# define ST_SYNCHRONOUS 0
		191	#endif
		192	#ifndef ST_MANDLOCK
		193	# define ST_MANDLOCK 0
		194	#endif
		195	#ifndef ST_WRITE
		196	# define ST_WRITE 0
		197	#endif
		198	#ifndef ST_APPEND
		199	# define ST_APPEND 0
		200	#endif
		201	#ifndef ST_IMMUTABLE
		202	# define ST_IMMUTABLE 0
		203	#endif
		204	#ifndef ST_NOATIME
		205	# define ST_NOATIME 0
		206	#endif
		207	#ifndef ST_NODIRATIME
		208	# define ST_NODIRATIME 0
		209	#endif
		210	#ifndef ST_RELATIME
		211	# define ST_RELATIME 0
		212	#endif
		213
		214	#ifndef MAP_ANONYMOUS
		215	# ifdef MAP_ANON
		216	# define MAP_ANONYMOUS MAP_ANON
		217	# else
		218	# define MAP_ANONYMOUS MAP_FIXED /* and hope this fails */
28	#endif	219	# endif
		220	#endif
		221	#ifndef MAP_HUGETLB
		222	# define MAP_HUGETLB 0
		223	#endif
		224	#ifndef MAP_LOCKED
		225	# define MAP_LOCKED 0
		226	#endif
		227	#ifndef MAP_NORESERVE
		228	# define MAP_NORESERVE 0
		229	#endif
		230	#ifndef MAP_POPULATE
		231	# define MAP_POPULATE 0
		232	#endif
		233	#ifndef MAP_NONBLOCK
		234	# define MAP_NONBLOCK 0
		235	#endif
		236
		237	#ifndef PAGESIZE
		238	# define PAGESIZE sysconf (_SC_PAGESIZE)
		239	#endif
		240
		241	static int req_invoke (eio_req *req);
		242	#define EIO_FINISH(req) req_invoke (req)
		243	static void req_destroy (eio_req *grp);
		244	#define EIO_DESTROY(req) req_destroy (req)
29		245
30	enum {	246	enum {
31	REQ_QUIT,	247	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
32	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35	REQ_FSYNC, REQ_FDATASYNC,
36	REQ_UNLINK, REQ_RMDIR,
37	REQ_SYMLINK,
38	};	248	};
39		249
40	typedef struct aio_cb {	250	#include "libeio/eio.c"
41	struct aio_cb *volatile next;
42		251
43	int type;
44
45	int fd;
46	off_t offset;
47	size_t length;
48	ssize_t result;
49	mode_t mode; /* open */
50	int errorno;
51	SV *data, *callback, *fh;
52	void *dataptr, *data2ptr;
53	STRLEN dataoffset;
54
55	Stat_t *statdata;
56	} aio_cb;
57
58	typedef aio_cb *aio_req;	252	typedef eio_req *aio_req;
		253	typedef eio_req *aio_req_ornot;
59		254
60	static int started;	255	static SV *on_next_submit;
61	static volatile int nreqs;	256	static int next_pri = EIO_PRI_DEFAULT;
62	static int max_outstanding = 1<<30;	257	static int max_outstanding;
63	static int respipe [2];
64		258
65	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	259	static s_epipe respipe;
66	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
67	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
68		260
69	static volatile aio_req reqs, reqe; /* queue start, queue end */	261	static void req_destroy (aio_req req);
70	static volatile aio_req ress, rese; /* queue start, queue end */
71
72	static void free_req (aio_req req)	262	static void req_cancel (aio_req req);
73	{
74	if (req->data)
75	SvREFCNT_dec (req->data);
76		263
		264	static void want_poll (void)
		265	{
		266	/* write a dummy byte to the pipe so fh becomes ready */
		267	s_epipe_signal (&respipe);
		268	}
		269
		270	static void done_poll (void)
		271	{
		272	/* read any signals sent by the worker threads */
		273	s_epipe_drain (&respipe);
		274	}
		275
		276	/* must be called at most once */
		277	static SV *req_sv (aio_req req, HV *stash)
		278	{
77	if (req->fh)	279	if (!req->self)
78	SvREFCNT_dec (req->fh);
79
80	if (req->statdata)
81	Safefree (req->statdata);
82
83	if (req->callback)
84	SvREFCNT_dec (req->callback);
85
86	Safefree (req);
87	}
88
89	static void
90	poll_wait ()
91	{
92	if (nreqs && !ress)
93	{	280	{
94	fd_set rfd;	281	req->self = (SV *)newHV ();
95	FD_ZERO(&rfd);	282	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
96	FD_SET(respipe [0], &rfd);
97
98	select (respipe [0] + 1, &rfd, 0, 0, 0);
99	}	283	}
100	}
101		284
102	static int	285	return sv_2mortal (sv_bless (newRV_inc (req->self), stash));
103	poll_cb ()	286	}
104	{
105	dSP;
106	int count = 0;
107	int do_croak = 0;
108	aio_req req;
109		287
110	for (;;)	288	static aio_req SvAIO_REQ (SV *sv)
		289	{
		290	MAGIC *mg;
		291
		292	if (!SvROK (sv)
		293	|| (SvSTASH (SvRV (sv)) != aio_grp_stash
		294	&& SvSTASH (SvRV (sv)) != aio_req_stash
		295	&& !sv_derived_from (sv, "IO::AIO::REQ")))
		296	croak ("object of class IO::AIO::REQ expected");
		297
		298	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		299
		300	return mg ? (aio_req)mg->mg_ptr : 0;
		301	}
		302
		303	static void aio_grp_feed (aio_req grp)
		304	{
		305	if (grp->sv2 && SvOK (grp->sv2))
111	{	306	{
112	pthread_mutex_lock (&reslock);	307	dSP;
113	req = ress;
114		308
115	if (req)	309	ENTER;
		310	SAVETMPS;
		311	PUSHMARK (SP);
		312	XPUSHs (req_sv (grp, aio_grp_stash));
		313	PUTBACK;
		314	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		315	SPAGAIN;
		316	FREETMPS;
		317	LEAVE;
		318	}
		319	}
		320
		321	static void req_submit (eio_req *req)
		322	{
		323	eio_submit (req);
		324
		325	if (expect_false (on_next_submit))
		326	{
		327	dSP;
		328	SV *cb = sv_2mortal (on_next_submit);
		329
		330	on_next_submit = 0;
		331
		332	PUSHMARK (SP);
		333	PUTBACK;
		334	call_sv (cb, G_DISCARD | G_EVAL);
		335	}
		336	}
		337
		338	static int req_invoke (eio_req *req)
		339	{
		340	if (req->flags & FLAG_SV2_RO_OFF)
		341	SvREADONLY_off (req->sv2);
		342
		343	if (!EIO_CANCELLED (req) && req->callback)
		344	{
		345	dSP;
		346	static SV *sv_result_cache; /* caches the result integer SV */
		347	SV *sv_result;
		348
		349	ENTER;
		350	SAVETMPS;
		351	PUSHMARK (SP);
		352	EXTEND (SP, 1);
		353
		354	/* do not recreate the result IV from scratch each time */
		355	if (expect_true (sv_result_cache))
116	{	356	{
117	ress = req->next;	357	sv_result = sv_result_cache; sv_result_cache = 0;
118		358	SvIV_set (sv_result, req->result);
119	if (!ress)
120	{
121	rese = 0;
122
123	/* read any signals sent by the worker threads */
124	char buf [32];
125	while (read (respipe [0], buf, 32) == 32)
126	;
127	}
128	}
129
130	pthread_mutex_unlock (&reslock);
131
132	if (!req)
133	break;
134
135	nreqs--;
136
137	if (req->type == REQ_QUIT)
138	started--;
139	else
140	{
141	int errorno = errno;
142	errno = req->errorno;
143
144	if (req->type == REQ_READ)
145	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
146
147	if (req->statdata)
148	{
149	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
150	PL_laststatval = req->result;
151	PL_statcache = *(req->statdata);
152	}
153
154	ENTER;
155	PUSHMARK (SP);
156	XPUSHs (sv_2mortal (newSViv (req->result)));
157
158	if (req->type == REQ_OPEN)
159	{
160	/* convert fd to fh */
161	SV *fh;
162
163	PUTBACK;
164	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
165	SPAGAIN;
166
167	fh = SvREFCNT_inc (POPs);
168
169	PUSHMARK (SP);
170	XPUSHs (sv_2mortal (fh));
171	}
172
173	if (SvOK (req->callback))
174	{
175	PUTBACK;
176	call_sv (req->callback, G_VOID | G_EVAL);
177	SPAGAIN;
178
179	if (SvTRUE (ERRSV))
180	{
181	free_req (req);
182	croak (0);
183	}
184	}
185
186	LEAVE;
187
188	errno = errorno;
189	count++;
190	}
191
192	free_req (req);
193	}
194
195	return count;
196	}
197
198	static void *aio_proc(void *arg);
199
200	static void
201	start_thread (void)
202	{
203	sigset_t fullsigset, oldsigset;
204	pthread_t tid;
205	pthread_attr_t attr;
206
207	pthread_attr_init (&attr);
208	pthread_attr_setstacksize (&attr, STACKSIZE);
209	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
210
211	sigfillset (&fullsigset);
212	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
213
214	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
215	started++;
216
217	sigprocmask (SIG_SETMASK, &oldsigset, 0);
218	}
219
220	static void
221	send_req (aio_req req)
222	{
223	nreqs++;
224
225	pthread_mutex_lock (&reqlock);
226
227	req->next = 0;
228
229	if (reqe)
230	{
231	reqe->next = req;
232	reqe = req;
233	}
234	else
235	reqe = reqs = req;
236
237	pthread_cond_signal (&reqwait);
238	pthread_mutex_unlock (&reqlock);
239
240	if (nreqs > max_outstanding)
241	for (;;)
242	{
243	poll_cb ();
244
245	if (nreqs <= max_outstanding)
246	break;
247
248	poll_wait ();
249	}
250	}
251
252	static void
253	end_thread (void)
254	{
255	aio_req req;
256	Newz (0, req, 1, aio_cb);
257	req->type = REQ_QUIT;
258
259	send_req (req);
260	}
261
262	static void min_parallel (int nthreads)
263	{
264	while (nthreads > started)
265	start_thread ();
266	}
267
268	static void max_parallel (int nthreads)
269	{
270	int cur = started;
271
272	while (cur > nthreads)
273	{
274	end_thread ();
275	cur--;
276	}
277
278	while (started > nthreads)
279	{
280	poll_wait ();
281	poll_cb ();
282	}
283	}
284
285	static void create_pipe ()
286	{
287	if (pipe (respipe))
288	croak ("unable to initialize result pipe");
289
290	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
291	croak ("cannot set result pipe to nonblocking mode");
292
293	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
294	croak ("cannot set result pipe to nonblocking mode");
295	}
296
297	static void atfork_prepare (void)
298	{
299	for (;;) {
300
301	for (;;)
302	{
303	poll_cb ();
304
305	if (!nreqs)
306	break;
307
308	poll_wait ();
309	}
310
311	pthread_mutex_lock (&reqlock);
312
313	if (!nreqs)
314	break;
315
316	pthread_mutex_unlock (&reqlock);
317	}
318
319	pthread_mutex_lock (&reslock);
320
321	assert (!nreqs && !reqs && !ress);
322	}
323
324	static void atfork_parent (void)
325	{
326	pthread_mutex_unlock (&reslock);
327	pthread_mutex_unlock (&reqlock);
328	}
329
330	static void atfork_child (void)
331	{
332	int restart = started;
333	started = 0;
334
335	atfork_parent ();
336
337	min_parallel (restart);
338	}
339
340	/*****************************************************************************/
341	/* work around various missing functions */
342
343	#if !HAVE_PREADWRITE
344	# define pread aio_pread
345	# define pwrite aio_pwrite
346
347	/*
348	* make our pread/pwrite safe against themselves, but not against
349	* normal read/write by using a mutex. slows down execution a lot,
350	* but that's your problem, not mine.
351	*/
352	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;
353
354	static ssize_t
355	pread (int fd, void *buf, size_t count, off_t offset)
356	{
357	ssize_t res;
358	off_t ooffset;
359
360	pthread_mutex_lock (&iolock);
361	ooffset = lseek (fd, 0, SEEK_CUR);
362	lseek (fd, offset, SEEK_SET);
363	res = read (fd, buf, count);
364	lseek (fd, ooffset, SEEK_SET);
365	pthread_mutex_unlock (&iolock);
366
367	return res;
368	}
369
370	static ssize_t
371	pwrite (int fd, void *buf, size_t count, off_t offset)
372	{
373	ssize_t res;
374	off_t ooffset;
375
376	pthread_mutex_lock (&iolock);
377	ooffset = lseek (fd, 0, SEEK_CUR);
378	lseek (fd, offset, SEEK_SET);
379	res = write (fd, buf, count);
380	lseek (fd, offset, SEEK_SET);
381	pthread_mutex_unlock (&iolock);
382
383	return res;
384	}
385	#endif
386
387	#if !HAVE_FDATASYNC
388	# define fdatasync fsync
389	#endif
390
391	#if !HAVE_READAHEAD
392	# define readahead aio_readahead
393
394	static char readahead_buf[4096];
395
396	static ssize_t
397	readahead (int fd, off_t offset, size_t count)
398	{
399	while (count > 0)
400	{
401	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
402
403	pread (fd, readahead_buf, len, offset);
404	offset += len;
405	count -= len;
406	}
407
408	errno = 0;
409	}
410	#endif
411
412	/*****************************************************************************/
413
414	static void *
415	aio_proc (void *thr_arg)
416	{
417	aio_req req;
418	int type;
419
420	do
421	{
422	pthread_mutex_lock (&reqlock);
423
424	for (;;)
425	{
426	req = reqs;
427
428	if (reqs)
429	{
430	reqs = reqs->next;
431	if (!reqs) reqe = 0;
432	}
433
434	if (req)
435	break;
436
437	pthread_cond_wait (&reqwait, &reqlock);
438	}
439
440	pthread_mutex_unlock (&reqlock);
441
442	errno = 0; /* strictly unnecessary */
443
444	type = req->type;
445
446	switch (type)
447	{
448	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
449	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
450
451	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
452
453	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
454	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
455	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
456
457	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
458	case REQ_CLOSE: req->result = close (req->fd); break;
459	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
460	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
461	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
462
463	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
464	case REQ_FSYNC: req->result = fsync (req->fd); break;
465
466	case REQ_QUIT:
467	break;
468
469	default:
470	req->result = ENOSYS;
471	break;
472	}
473
474	req->errorno = errno;
475
476	pthread_mutex_lock (&reslock);
477
478	req->next = 0;
479
480	if (rese)
481	{
482	rese->next = req;
483	rese = req;
484	}	359	}
485	else	360	else
486	{	361	{
487	rese = ress = req;	362	sv_result = newSViv (req->result);
488		363	SvREADONLY_on (sv_result);
489	/* write a dummy byte to the pipe so fh becomes ready */
490	write (respipe [1], &respipe, 1);
491	}	364	}
492		365
493	pthread_mutex_unlock (&reslock);	366	switch (req->type)
		367	{
		368	case EIO_READDIR:
		369	{
		370	SV *rv = &PL_sv_undef;
		371
		372	if (req->result >= 0)
		373	{
		374	int i;
		375	char *names = (char *)req->ptr2;
		376	eio_dirent *ent = (eio_dirent *)req->ptr1; /* might be 0 */
		377	AV *av = newAV ();
		378
		379	av_extend (av, req->result - 1);
		380
		381	for (i = 0; i < req->result; ++i)
		382	{
		383	if (req->int1 & EIO_READDIR_DENTS)
		384	{
		385	SV *namesv = newSVpvn (names + ent->nameofs, ent->namelen);
		386
		387	if (req->int1 & EIO_READDIR_CUSTOM2)
		388	{
		389	static SV *sv_type [EIO_DT_MAX + 1]; /* type sv cache */
		390	AV *avent = newAV ();
		391
		392	av_extend (avent, 2);
		393
		394	if (!sv_type [ent->type])
		395	{
		396	sv_type [ent->type] = newSViv (ent->type);
		397	SvREADONLY_on (sv_type [ent->type]);
		398	}
		399
		400	av_store (avent, 0, namesv);
		401	av_store (avent, 1, SvREFCNT_inc (sv_type [ent->type]));
		402	av_store (avent, 2, IVSIZE >= 8 ? newSVuv (ent->inode) : newSVnv (ent->inode));
		403
		404	av_store (av, i, newRV_noinc ((SV *)avent));
		405	}
		406	else
		407	av_store (av, i, namesv);
		408
		409	++ent;
		410	}
		411	else
		412	{
		413	SV *name = newSVpv (names, 0);
		414	av_store (av, i, name);
		415	names += SvCUR (name) + 1;
		416	}
		417	}
		418
		419	rv = sv_2mortal (newRV_noinc ((SV *)av));
		420	}
		421
		422	PUSHs (rv);
		423
		424	if (req->int1 & EIO_READDIR_CUSTOM1)
		425	XPUSHs (sv_2mortal (newSViv (req->int1 & ~(EIO_READDIR_CUSTOM1 | EIO_READDIR_CUSTOM2))));
		426	}
		427	break;
		428
		429	case EIO_OPEN:
		430	{
		431	/* convert fd to fh */
		432	SV *fh = &PL_sv_undef;
		433
		434	if (req->result >= 0)
		435	{
		436	GV *gv = (GV *)sv_newmortal ();
		437	int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
		438	char sym [64];
		439	int symlen;
		440
		441	symlen = snprintf (sym, sizeof (sym), "fd#%d", (int)req->result);
		442	gv_init (gv, aio_stash, sym, symlen, 0);
		443
		444	symlen = snprintf (
		445	sym,
		446	sizeof (sym),
		447	"%s&=%d",
		448	flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
		449	(int)req->result
		450	);
		451
		452	if (do_open (gv, sym, symlen, 0, 0, 0, 0))
		453	fh = (SV *)gv;
		454	}
		455
		456	PUSHs (fh);
		457	}
		458	break;
		459
		460	case EIO_STATVFS:
		461	case EIO_FSTATVFS:
		462	{
		463	SV *rv = &PL_sv_undef;
		464
		465	if (req->result >= 0)
		466	{
		467	EIO_STRUCT_STATVFS *f = EIO_STATVFS_BUF (req);
		468	HV *hv = newHV ();
		469
		470	rv = sv_2mortal (newRV_noinc ((SV *)hv));
		471
		472	hv_store (hv, "bsize" , sizeof ("bsize" ) - 1, newSVval64 (f->f_bsize ), 0);
		473	hv_store (hv, "frsize" , sizeof ("frsize" ) - 1, newSVval64 (f->f_frsize ), 0);
		474	hv_store (hv, "blocks" , sizeof ("blocks" ) - 1, newSVval64 (f->f_blocks ), 0);
		475	hv_store (hv, "bfree" , sizeof ("bfree" ) - 1, newSVval64 (f->f_bfree ), 0);
		476	hv_store (hv, "bavail" , sizeof ("bavail" ) - 1, newSVval64 (f->f_bavail ), 0);
		477	hv_store (hv, "files" , sizeof ("files" ) - 1, newSVval64 (f->f_files ), 0);
		478	hv_store (hv, "ffree" , sizeof ("ffree" ) - 1, newSVval64 (f->f_ffree ), 0);
		479	hv_store (hv, "favail" , sizeof ("favail" ) - 1, newSVval64 (f->f_favail ), 0);
		480	hv_store (hv, "fsid" , sizeof ("fsid" ) - 1, newSVval64 (f->f_fsid ), 0);
		481	hv_store (hv, "flag" , sizeof ("flag" ) - 1, newSVval64 (f->f_flag ), 0);
		482	hv_store (hv, "namemax", sizeof ("namemax") - 1, newSVval64 (f->f_namemax), 0);
		483	}
		484
		485	PUSHs (rv);
		486	}
		487
		488	break;
		489
		490	case EIO_GROUP:
		491	req->int1 = 2; /* mark group as finished */
		492
		493	if (req->sv1)
		494	{
		495	int i;
		496	AV *av = (AV *)req->sv1;
		497
		498	EXTEND (SP, AvFILL (av) + 1);
		499	for (i = 0; i <= AvFILL (av); ++i)
		500	PUSHs (*av_fetch (av, i, 0));
		501	}
		502	break;
		503
		504	case EIO_NOP:
		505	case EIO_BUSY:
		506	break;
		507
		508	case EIO_READLINK:
		509	if (req->result > 0)
		510	PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
		511	break;
		512
		513	case EIO_STAT:
		514	case EIO_LSTAT:
		515	case EIO_FSTAT:
		516	PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
		517	PL_laststatval = req->result;
		518	PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
		519	PUSHs (sv_result);
		520	break;
		521
		522	case EIO_READ:
		523	{
		524	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		525	*SvEND (req->sv2) = 0;
		526	SvPOK_only (req->sv2);
		527	SvSETMAGIC (req->sv2);
		528	PUSHs (sv_result);
		529	}
		530	break;
		531
		532	case EIO_DUP2: /* EIO_DUP2 actually means aio_close(), su fudge result value */
		533	if (req->result > 0)
		534	SvIV_set (sv_result, 0);
		535	/* FALLTHROUGH */
		536
		537	default:
		538	PUSHs (sv_result);
		539	break;
		540	}
		541
		542	errno = req->errorno;
		543
		544	PUTBACK;
		545	call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
		546	SPAGAIN;
		547
		548	if (expect_false (SvREFCNT (sv_result) != 1 || sv_result_cache))
		549	SvREFCNT_dec (sv_result);
		550	else
		551	sv_result_cache = sv_result;
		552
		553	FREETMPS;
		554	LEAVE;
		555
		556	PUTBACK;
494	}	557	}
495	while (type != REQ_QUIT);	558
		559	return !!SvTRUE (ERRSV);
		560	}
		561
		562	static void req_destroy (aio_req req)
		563	{
		564	if (req->self)
		565	{
		566	sv_unmagic (req->self, PERL_MAGIC_ext);
		567	SvREFCNT_dec (req->self);
		568	}
		569
		570	SvREFCNT_dec (req->sv1);
		571	SvREFCNT_dec (req->sv2);
		572	SvREFCNT_dec (req->callback);
		573
		574	Safefree (req);
		575	}
		576
		577	static void req_cancel_subs (aio_req grp)
		578	{
		579	aio_req sub;
		580
		581	if (grp->type != EIO_GROUP)
		582	return;
		583
		584	SvREFCNT_dec (grp->sv2);
		585	grp->sv2 = 0;
		586
		587	eio_grp_cancel (grp);
		588	}
		589
		590	static void
		591	create_respipe (void)
		592	{
		593	if (s_epipe_renew (&respipe))
		594	croak ("IO::AIO: unable to initialize result pipe");
		595	}
		596
		597	static void poll_wait (void)
		598	{
		599	while (eio_nreqs ())
		600	{
		601	int size;
		602
		603	X_LOCK (reslock);
		604	size = res_queue.size;
		605	X_UNLOCK (reslock);
		606
		607	if (size)
		608	return;
		609
		610	etp_maybe_start_thread ();
		611
		612	s_epipe_wait (&respipe);
		613	}
		614	}
		615
		616	static int poll_cb (void)
		617	{
		618	for (;;)
		619	{
		620	int res = eio_poll ();
		621
		622	if (res > 0)
		623	croak (0);
		624
		625	if (!max_outstanding || max_outstanding > eio_nreqs ())
		626	return res;
		627
		628	poll_wait ();
		629	}
		630	}
		631
		632	static void atfork_child (void)
		633	{
		634	create_respipe ();
		635	}
		636
		637	/*****************************************************************************/
		638
		639	#if !_POSIX_MAPPED_FILES
		640	# define mmap(addr,length,prot,flags,fd,offs) (errno = ENOSYS, -1)
		641	# define munmap(addr,length) (errno = ENOSYS, -1)
		642	# define mprotect(addr,len,prot) (errno = ENOSYS, -1)
		643	#endif
		644
		645	#define MMAP_MAGIC PERL_MAGIC_ext
		646
		647	static int
		648	mmap_free (pTHX_ SV *sv, MAGIC *mg)
		649	{
		650	int old_errno = errno;
		651	munmap (mg->mg_ptr, (size_t)mg->mg_obj);
		652	errno = old_errno;
		653
		654	mg->mg_obj = 0; /* just in case */
		655
		656	SvREADONLY_off (sv);
		657
		658	if (SvPVX (sv) != mg->mg_ptr)
		659	croak ("ERROR: IO::AIO::mmap-mapped scalar changed location, detected");
		660
		661	SvCUR_set (sv, 0);
		662	SvPVX (sv) = 0;
		663	SvOK_off (sv);
496		664
497	return 0;	665	return 0;
498	}	666	}
499		667
		668	static MGVTBL mmap_vtbl = {
		669	0, 0, 0, 0, mmap_free
		670	};
		671
		672	/*****************************************************************************/
		673
		674	static SV *
		675	get_cb (SV *cb_sv)
		676	{
		677	SvGETMAGIC (cb_sv);
		678	return SvOK (cb_sv) ? s_get_cv_croak (cb_sv) : 0;
		679	}
		680
500	#define dREQ \	681	#define dREQ \
		682	SV *cb_cv; \
501	aio_req req; \	683	aio_req req; \
		684	int req_pri = next_pri; \
		685	next_pri = EIO_PRI_DEFAULT; \
502	\	686	\
503	if (SvOK (callback) && !SvROK (callback)) \	687	cb_cv = get_cb (callback); \
504	croak ("clalback must be undef or of reference type"); \
505	\	688	\
506	Newz (0, req, 1, aio_cb); \	689	Newz (0, req, 1, eio_req); \
507	if (!req) \	690	if (!req) \
508	croak ("out of memory during aio_req allocation"); \	691	croak ("out of memory during eio_req allocation"); \
509	\	692	\
510	req->callback = newSVsv (callback);	693	req->callback = SvREFCNT_inc (cb_cv); \
511		694	req->pri = req_pri
		695
		696	#define REQ_SEND \
		697	PUTBACK; \
		698	req_submit (req); \
		699	SPAGAIN; \
		700	\
		701	if (GIMME_V != G_VOID) \
		702	XPUSHs (req_sv (req, aio_req_stash));
		703
512	MODULE = IO::AIO PACKAGE = IO::AIO	704	MODULE = IO::AIO PACKAGE = IO::AIO
513		705
514	PROTOTYPES: ENABLE	706	PROTOTYPES: ENABLE
515		707
516	BOOT:	708	BOOT:
517	{	709	{
		710	static const struct {
		711	const char *name;
		712	IV iv;
		713	} *civ, const_iv[] = {
		714	# define const_niv(name, value) { # name, (IV) value },
		715	# define const_iv(name) { # name, (IV) name },
		716	# define const_eio(name) { # name, (IV) EIO_ ## name },
		717	const_iv (EXDEV)
		718	const_iv (ENOSYS)
		719	const_iv (O_RDONLY)
		720	const_iv (O_WRONLY)
		721	const_iv (O_RDWR)
		722	const_iv (O_CREAT)
		723	const_iv (O_TRUNC)
		724	const_iv (O_EXCL)
		725	const_iv (O_APPEND)
		726	#ifndef _WIN32
		727	const_iv (S_IFIFO)
		728	#endif
		729	const_niv (FADV_NORMAL , POSIX_FADV_NORMAL)
		730	const_niv (FADV_SEQUENTIAL, POSIX_FADV_SEQUENTIAL)
		731	const_niv (FADV_RANDOM , POSIX_FADV_RANDOM)
		732	const_niv (FADV_NOREUSE , POSIX_FADV_NOREUSE)
		733	const_niv (FADV_WILLNEED , POSIX_FADV_WILLNEED)
		734	const_niv (FADV_DONTNEED , POSIX_FADV_DONTNEED)
		735
		736	const_niv (MADV_NORMAL , POSIX_MADV_NORMAL)
		737	const_niv (MADV_SEQUENTIAL, POSIX_MADV_SEQUENTIAL)
		738	const_niv (MADV_RANDOM , POSIX_MADV_RANDOM)
		739	const_niv (MADV_WILLNEED , POSIX_MADV_WILLNEED)
		740	const_niv (MADV_DONTNEED , POSIX_MADV_DONTNEED)
		741
		742	const_iv (ST_RDONLY)
		743	const_iv (ST_NOSUID)
		744	const_iv (ST_NODEV)
		745	const_iv (ST_NOEXEC)
		746	const_iv (ST_SYNCHRONOUS)
		747	const_iv (ST_MANDLOCK)
		748	const_iv (ST_WRITE)
		749	const_iv (ST_APPEND)
		750	const_iv (ST_IMMUTABLE)
		751	const_iv (ST_NOATIME)
		752	const_iv (ST_NODIRATIME)
		753	const_iv (ST_RELATIME)
		754
		755	const_iv (PROT_NONE)
		756	const_iv (PROT_EXEC)
		757	const_iv (PROT_READ)
		758	const_iv (PROT_WRITE)
		759
		760	/*const_iv (MAP_FIXED)*/
		761	const_iv (MAP_PRIVATE)
		762	const_iv (MAP_SHARED)
		763	const_iv (MAP_ANONYMOUS)
		764
		765	/* linuxish */
		766	const_iv (MAP_HUGETLB)
		767	const_iv (MAP_LOCKED)
		768	const_iv (MAP_NORESERVE)
		769	const_iv (MAP_POPULATE)
		770	const_iv (MAP_NONBLOCK)
		771
		772	const_eio (MCL_FUTURE)
		773	const_eio (MCL_CURRENT)
		774
		775	const_eio (MS_ASYNC)
		776	const_eio (MS_INVALIDATE)
		777	const_eio (MS_SYNC)
		778
		779	const_eio (MT_MODIFY)
		780
		781	const_eio (SYNC_FILE_RANGE_WAIT_BEFORE)
		782	const_eio (SYNC_FILE_RANGE_WRITE)
		783	const_eio (SYNC_FILE_RANGE_WAIT_AFTER)
		784
		785	const_eio (READDIR_DENTS)
		786	const_eio (READDIR_DIRS_FIRST)
		787	const_eio (READDIR_STAT_ORDER)
		788	const_eio (READDIR_FOUND_UNKNOWN)
		789
		790	const_eio (DT_UNKNOWN)
		791	const_eio (DT_FIFO)
		792	const_eio (DT_CHR)
		793	const_eio (DT_DIR)
		794	const_eio (DT_BLK)
		795	const_eio (DT_REG)
		796	const_eio (DT_LNK)
		797	const_eio (DT_SOCK)
		798	const_eio (DT_WHT)
		799	};
		800
		801	aio_stash = gv_stashpv ("IO::AIO" , 1);
		802	aio_req_stash = gv_stashpv ("IO::AIO::REQ", 1);
		803	aio_grp_stash = gv_stashpv ("IO::AIO::GRP", 1);
		804
		805	for (civ = const_iv + sizeof (const_iv) / sizeof (const_iv [0]); civ-- > const_iv; )
		806	newCONSTSUB (aio_stash, (char *)civ->name, newSViv (civ->iv));
		807
		808	newCONSTSUB (aio_stash, "PAGESIZE", newSViv (PAGESIZE));
		809
518	create_pipe ();	810	create_respipe ();
519	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
520	}
521		811
		812	if (eio_init (want_poll, done_poll) < 0)
		813	croak ("IO::AIO: unable to initialise eio library");
		814
		815	/* atfork child called in fifo order, so before eio's handler */
		816	X_THREAD_ATFORK (0, 0, atfork_child);
		817	}
		818
522	void	819	void
523	min_parallel(nthreads)	820	max_poll_reqs (int nreqs)
524	int nthreads
525	PROTOTYPE: $	821	PROTOTYPE: $
		822	CODE:
		823	eio_set_max_poll_reqs (nreqs);
526		824
527	void	825	void
528	max_parallel(nthreads)	826	max_poll_time (double nseconds)
529	int nthreads
530	PROTOTYPE: $	827	PROTOTYPE: $
531
532	int
533	max_outstanding(nreqs)
534	int nreqs
535	PROTOTYPE: $
536	CODE:	828	CODE:
537	RETVAL = max_outstanding;	829	eio_set_max_poll_time (nseconds);
		830
		831	void
		832	min_parallel (int nthreads)
		833	PROTOTYPE: $
		834	CODE:
		835	eio_set_min_parallel (nthreads);
		836
		837	void
		838	max_parallel (int nthreads)
		839	PROTOTYPE: $
		840	CODE:
		841	eio_set_max_parallel (nthreads);
		842
		843	void
		844	max_idle (int nthreads)
		845	PROTOTYPE: $
		846	CODE:
		847	eio_set_max_idle (nthreads);
		848
		849	void
		850	max_outstanding (int maxreqs)
		851	PROTOTYPE: $
		852	CODE:
538	max_outstanding = nreqs;	853	max_outstanding = maxreqs;
539		854
540	void	855	void
541	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	856	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
542	SV * pathname
543	int flags
544	int mode
545	SV * callback
546	PROTOTYPE: $$$;$
547	CODE:	857	PPCODE:
548	{	858	{
549	dREQ;	859	dREQ;
550		860
551	req->type = REQ_OPEN;	861	req->type = EIO_OPEN;
552	req->data = newSVsv (pathname);	862	req->sv1 = newSVsv (pathname);
553	req->dataptr = SvPVbyte_nolen (req->data);	863	req->ptr1 = SvPVbyte_nolen (req->sv1);
554	req->fd = flags;	864	req->int1 = flags;
555	req->mode = mode;	865	req->int2 = mode;
556		866
557	send_req (req);	867	REQ_SEND;
558	}	868	}
559		869
560	void	870	void
561	aio_close(fh,callback=&PL_sv_undef)	871	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
562	SV * fh
563	SV * callback
564	PROTOTYPE: $;$
565	ALIAS:	872	ALIAS:
566	aio_close = REQ_CLOSE
567	aio_fsync = REQ_FSYNC	873	aio_fsync = EIO_FSYNC
568	aio_fdatasync = REQ_FDATASYNC	874	aio_fdatasync = EIO_FDATASYNC
569	CODE:	875	PPCODE:
570	{	876	{
		877	int fd = s_fileno_croak (fh, 0);
571	dREQ;	878	dREQ;
572		879
573	req->type = ix;	880	req->type = ix;
574	req->fh = newSVsv (fh);	881	req->sv1 = newSVsv (fh);
575	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	882	req->int1 = fd;
576		883
577	send_req (req);	884	REQ_SEND (req);
578	}	885	}
579		886
580	void	887	void
		888	aio_sync_file_range (SV *fh, off_t offset, size_t nbytes, UV flags, SV *callback=&PL_sv_undef)
		889	PPCODE:
		890	{
		891	int fd = s_fileno_croak (fh, 0);
		892	dREQ;
		893
		894	req->type = EIO_SYNC_FILE_RANGE;
		895	req->sv1 = newSVsv (fh);
		896	req->int1 = fd;
		897	req->offs = offset;
		898	req->size = nbytes;
		899	req->int2 = flags;
		900
		901	REQ_SEND (req);
		902	}
		903
		904	void
		905	aio_close (SV *fh, SV *callback=&PL_sv_undef)
		906	PPCODE:
		907	{
		908	static int close_pipe = -1; /* dummy fd to close fds via dup2 */
		909	int fd = s_fileno_croak (fh, 0);
		910	dREQ;
		911
		912	if (close_pipe < 0)
		913	{
		914	int pipefd [2];
		915
		916	if (pipe (pipefd) < 0
		917	|| close (pipefd [1]) < 0
		918	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
		919	abort (); /*D*/
		920
		921	close_pipe = pipefd [0];
		922	}
		923
		924	req->type = EIO_DUP2;
		925	req->int1 = close_pipe;
		926	req->sv2 = newSVsv (fh);
		927	req->int2 = fd;
		928
		929	REQ_SEND (req);
		930	}
		931
		932	void
581	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	933	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
582	SV * fh
583	UV offset
584	IV length
585	SV * data
586	IV dataoffset
587	SV * callback
588	ALIAS:	934	ALIAS:
589	aio_read = REQ_READ	935	aio_read = EIO_READ
590	aio_write = REQ_WRITE	936	aio_write = EIO_WRITE
591	PROTOTYPE: $$$$$;$
592	CODE:	937	PPCODE:
593	{	938	{
594	aio_req req;
595	STRLEN svlen;	939	STRLEN svlen;
		940	int fd = s_fileno_croak (fh, ix == EIO_WRITE);
596	char *svptr = SvPVbyte (data, svlen);	941	char *svptr = SvPVbyte (data, svlen);
597		942	UV len = SvUV (length);
598	SvUPGRADE (data, SVt_PV);
599	SvPOK_on (data);
600		943
601	if (dataoffset < 0)	944	if (dataoffset < 0)
602	dataoffset += svlen;	945	dataoffset += svlen;
603		946
604	if (dataoffset < 0 || dataoffset > svlen)	947	if (dataoffset < 0 || dataoffset > svlen)
605	croak ("data offset outside of string");	948	croak ("dataoffset outside of data scalar");
606		949
607	if (ix == REQ_WRITE)	950	if (ix == EIO_WRITE)
608	{	951	{
609	/* write: check length and adjust. */	952	/* write: check length and adjust. */
610	if (length < 0 || length + dataoffset > svlen)	953	if (!SvOK (length) || len + dataoffset > svlen)
611	length = svlen - dataoffset;	954	len = svlen - dataoffset;
612	}	955	}
613	else	956	else
614	{	957	{
615	/* read: grow scalar as necessary */	958	/* read: check type and grow scalar as necessary */
		959	SvUPGRADE (data, SVt_PV);
616	svptr = SvGROW (data, length + dataoffset);	960	svptr = SvGROW (data, len + dataoffset + 1);
617	}	961	}
618
619	if (length < 0)
620	croak ("length must not be negative");
621		962
622	{	963	{
623	dREQ;	964	dREQ;
624		965
625	req->type = ix;	966	req->type = ix;
626	req->fh = newSVsv (fh);	967	req->sv1 = newSVsv (fh);
627	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	968	req->int1 = fd;
628	: IoOFP (sv_2io (fh)));	969	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
629	req->offset = offset;	970	req->size = len;
630	req->length = length;
631	req->data = SvREFCNT_inc (data);	971	req->sv2 = SvREFCNT_inc (data);
632	req->dataptr = (char *)svptr + dataoffset;	972	req->ptr2 = (char *)svptr + dataoffset;
		973	req->stroffset = dataoffset;
633		974
634	send_req (req);	975	if (!SvREADONLY (data))
		976	{
		977	SvREADONLY_on (data);
		978	req->flags |= FLAG_SV2_RO_OFF;
		979	}
		980
		981	REQ_SEND;
635	}	982	}
636	}	983	}
637		984
638	void	985	void
639	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	986	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
640	SV * fh
641	UV offset
642	IV length
643	SV * callback
644	PROTOTYPE: $$$;$
645	CODE:	987	PPCODE:
646	{	988	{
		989	SV *data;
		990	dREQ;
		991
		992	req->type = EIO_READLINK;
		993	req->sv1 = newSVsv (path);
		994	req->ptr1 = SvPVbyte_nolen (req->sv1);
		995
		996	REQ_SEND;
		997	}
		998
		999	void
		1000	aio_sendfile (SV *out_fh, SV *in_fh, off_t in_offset, size_t length, SV *callback=&PL_sv_undef)
		1001	PPCODE:
		1002	{
		1003	int ifd = s_fileno_croak (in_fh , 0);
		1004	int ofd = s_fileno_croak (out_fh, 1);
647	dREQ;	1005	dREQ;
648		1006
		1007	req->type = EIO_SENDFILE;
		1008	req->sv1 = newSVsv (out_fh);
		1009	req->int1 = ofd;
		1010	req->sv2 = newSVsv (in_fh);
		1011	req->int2 = ifd;
		1012	req->offs = in_offset;
		1013	req->size = length;
		1014
		1015	REQ_SEND;
		1016	}
		1017
		1018	void
		1019	aio_readahead (SV *fh, off_t offset, size_t length, SV *callback=&PL_sv_undef)
		1020	PPCODE:
		1021	{
		1022	int fd = s_fileno_croak (fh, 0);
		1023	dREQ;
		1024
649	req->type = REQ_READAHEAD;	1025	req->type = EIO_READAHEAD;
650	req->fh = newSVsv (fh);	1026	req->sv1 = newSVsv (fh);
651	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1027	req->int1 = fd;
652	req->offset = offset;	1028	req->offs = offset;
653	req->length = length;	1029	req->size = length;
654		1030
655	send_req (req);	1031	REQ_SEND;
656	}	1032	}
657		1033
658	void	1034	void
659	aio_stat(fh_or_path,callback=&PL_sv_undef)	1035	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
660	SV * fh_or_path
661	SV * callback
662	ALIAS:	1036	ALIAS:
663	aio_stat = REQ_STAT	1037	aio_stat = EIO_STAT
664	aio_lstat = REQ_LSTAT	1038	aio_lstat = EIO_LSTAT
		1039	aio_statvfs = EIO_STATVFS
665	CODE:	1040	PPCODE:
666	{	1041	{
667	dREQ;	1042	dREQ;
668		1043
669	New (0, req->statdata, 1, Stat_t);	1044	req->sv1 = newSVsv (fh_or_path);
670	if (!req->statdata)
671	{
672	free_req (req);
673	croak ("out of memory during aio_req->statdata allocation");
674	}
675		1045
676	if (SvPOK (fh_or_path))	1046	if (SvPOK (req->sv1))
677	{	1047	{
678	req->type = ix;	1048	req->type = ix;
679	req->data = newSVsv (fh_or_path);
680	req->dataptr = SvPVbyte_nolen (req->data);	1049	req->ptr1 = SvPVbyte_nolen (req->sv1);
681	}	1050	}
682	else	1051	else
683	{	1052	{
684	req->type = REQ_FSTAT;	1053	req->type = ix == EIO_STATVFS ? EIO_FSTATVFS : EIO_FSTAT;
685	req->fh = newSVsv (fh_or_path);
686	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1054	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
687	}	1055	}
688		1056
689	send_req (req);	1057	REQ_SEND;
690	}	1058	}
691		1059
692	void	1060	void
		1061	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		1062	PPCODE:
		1063	{
		1064	dREQ;
		1065
		1066	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		1067	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		1068	req->sv1 = newSVsv (fh_or_path);
		1069
		1070	if (SvPOK (req->sv1))
		1071	{
		1072	req->type = EIO_UTIME;
		1073	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1074	}
		1075	else
		1076	{
		1077	req->type = EIO_FUTIME;
		1078	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1079	}
		1080
		1081	REQ_SEND;
		1082	}
		1083
		1084	void
		1085	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		1086	PPCODE:
		1087	{
		1088	dREQ;
		1089
		1090	req->sv1 = newSVsv (fh_or_path);
		1091	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		1092
		1093	if (SvPOK (req->sv1))
		1094	{
		1095	req->type = EIO_TRUNCATE;
		1096	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1097	}
		1098	else
		1099	{
		1100	req->type = EIO_FTRUNCATE;
		1101	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1102	}
		1103
		1104	REQ_SEND;
		1105	}
		1106
		1107	void
		1108	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		1109	ALIAS:
		1110	aio_chmod = EIO_CHMOD
		1111	aio_mkdir = EIO_MKDIR
		1112	PPCODE:
		1113	{
		1114	dREQ;
		1115
		1116	req->int2 = mode;
		1117	req->sv1 = newSVsv (fh_or_path);
		1118
		1119	if (SvPOK (req->sv1))
		1120	{
		1121	req->type = ix;
		1122	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1123	}
		1124	else
		1125	{
		1126	req->type = EIO_FCHMOD;
		1127	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1128	}
		1129
		1130	REQ_SEND;
		1131	}
		1132
		1133	void
		1134	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		1135	PPCODE:
		1136	{
		1137	dREQ;
		1138
		1139	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		1140	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		1141	req->sv1 = newSVsv (fh_or_path);
		1142
		1143	if (SvPOK (req->sv1))
		1144	{
		1145	req->type = EIO_CHOWN;
		1146	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1147	}
		1148	else
		1149	{
		1150	req->type = EIO_FCHOWN;
		1151	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1152	}
		1153
		1154	REQ_SEND;
		1155	}
		1156
		1157	void
		1158	aio_readdirx (SV8 *pathname, IV flags, SV *callback=&PL_sv_undef)
		1159	PPCODE:
		1160	{
		1161	dREQ;
		1162
		1163	req->type = EIO_READDIR;
		1164	req->sv1 = newSVsv (pathname);
		1165	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1166	req->int1 = flags | EIO_READDIR_DENTS | EIO_READDIR_CUSTOM1;
		1167
		1168	if (flags & EIO_READDIR_DENTS)
		1169	req->int1 |= EIO_READDIR_CUSTOM2;
		1170
		1171	REQ_SEND;
		1172	}
		1173
		1174	void
693	aio_unlink(pathname,callback=&PL_sv_undef)	1175	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
694	SV * pathname
695	SV * callback
696	ALIAS:	1176	ALIAS:
697	aio_unlink = REQ_UNLINK	1177	aio_unlink = EIO_UNLINK
698	aio_rmdir = REQ_RMDIR	1178	aio_rmdir = EIO_RMDIR
		1179	aio_readdir = EIO_READDIR
699	CODE:	1180	PPCODE:
700	{	1181	{
701	dREQ;	1182	dREQ;
702		1183
703	req->type = ix;	1184	req->type = ix;
704	req->data = newSVsv (pathname);	1185	req->sv1 = newSVsv (pathname);
705	req->dataptr = SvPVbyte_nolen (req->data);	1186	req->ptr1 = SvPVbyte_nolen (req->sv1);
706
707	send_req (req);
708	}
709		1187
		1188	REQ_SEND;
		1189	}
		1190
710	void	1191	void
711	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1192	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
712	SV * oldpath	1193	ALIAS:
713	SV * newpath	1194	aio_link = EIO_LINK
714	SV * callback	1195	aio_symlink = EIO_SYMLINK
		1196	aio_rename = EIO_RENAME
715	CODE:	1197	PPCODE:
716	{	1198	{
717	dREQ;	1199	dREQ;
718		1200
719	req->type = REQ_SYMLINK;	1201	req->type = ix;
720	req->fh = newSVsv (oldpath);	1202	req->sv1 = newSVsv (oldpath);
721	req->data2ptr = SvPVbyte_nolen (req->fh);	1203	req->ptr1 = SvPVbyte_nolen (req->sv1);
722	req->data = newSVsv (newpath);	1204	req->sv2 = newSVsv (newpath);
723	req->dataptr = SvPVbyte_nolen (req->data);	1205	req->ptr2 = SvPVbyte_nolen (req->sv2);
724		1206
725	send_req (req);	1207	REQ_SEND;
726	}	1208	}
727		1209
728	void	1210	void
729	flush()	1211	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
730	PROTOTYPE:	1212	PPCODE:
		1213	{
		1214	dREQ;
		1215
		1216	req->type = EIO_MKNOD;
		1217	req->sv1 = newSVsv (pathname);
		1218	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1219	req->int2 = (mode_t)mode;
		1220	req->offs = dev;
		1221
		1222	REQ_SEND;
		1223	}
		1224
		1225	void
		1226	aio_mtouch (SV8 *data, IV offset = 0, SV *length = &PL_sv_undef, int flags = 0, SV *callback=&PL_sv_undef)
		1227	ALIAS:
		1228	aio_mtouch = EIO_MTOUCH
		1229	aio_msync = EIO_MSYNC
		1230	PPCODE:
		1231	{
		1232	STRLEN svlen;
		1233	char *svptr = SvPVbyte (data, svlen);
		1234	UV len = SvUV (length);
		1235
		1236	if (offset < 0)
		1237	offset += svlen;
		1238
		1239	if (offset < 0 || offset > svlen)
		1240	croak ("offset outside of scalar");
		1241
		1242	if (!SvOK (length) || len + offset > svlen)
		1243	len = svlen - offset;
		1244
		1245	{
		1246	dREQ;
		1247
		1248	req->type = ix;
		1249	req->sv2 = SvREFCNT_inc (data);
		1250	req->ptr2 = (char *)svptr + offset;
		1251	req->size = len;
		1252	req->int1 = flags;
		1253
		1254	REQ_SEND;
		1255	}
		1256	}
		1257
		1258	void
		1259	aio_mlock (SV8 *data, IV offset = 0, SV *length = &PL_sv_undef, SV *callback=&PL_sv_undef)
		1260	PPCODE:
		1261	{
		1262	STRLEN svlen;
		1263	char *svptr = SvPVbyte (data, svlen);
		1264	UV len = SvUV (length);
		1265
		1266	if (offset < 0)
		1267	offset += svlen;
		1268
		1269	if (offset < 0 || offset > svlen)
		1270	croak ("offset outside of scalar");
		1271
		1272	if (!SvOK (length) || len + offset > svlen)
		1273	len = svlen - offset;
		1274
		1275	{
		1276	dREQ;
		1277
		1278	req->type = EIO_MLOCK;
		1279	req->sv2 = SvREFCNT_inc (data);
		1280	req->ptr2 = (char *)svptr + offset;
		1281	req->size = len;
		1282
		1283	REQ_SEND;
		1284	}
		1285	}
		1286
		1287	void
		1288	aio_mlockall (IV flags, SV *callback=&PL_sv_undef)
		1289	PPCODE:
		1290	{
		1291	dREQ;
		1292
		1293	req->type = EIO_MLOCKALL;
		1294	req->int1 = flags;
		1295
		1296	REQ_SEND;
		1297	}
		1298
		1299	void
		1300	aio_busy (double delay, SV *callback=&PL_sv_undef)
		1301	PPCODE:
		1302	{
		1303	dREQ;
		1304
		1305	req->type = EIO_BUSY;
		1306	req->nv1 = delay < 0. ? 0. : delay;
		1307
		1308	REQ_SEND;
		1309	}
		1310
		1311	void
		1312	aio_group (SV *callback=&PL_sv_undef)
		1313	PPCODE:
		1314	{
		1315	dREQ;
		1316
		1317	req->type = EIO_GROUP;
		1318
		1319	req_submit (req);
		1320	XPUSHs (req_sv (req, aio_grp_stash));
		1321	}
		1322
		1323	void
		1324	aio_nop (SV *callback=&PL_sv_undef)
		1325	ALIAS:
		1326	aio_nop = EIO_NOP
		1327	aio_sync = EIO_SYNC
		1328	PPCODE:
		1329	{
		1330	dREQ;
		1331
		1332	req->type = ix;
		1333
		1334	REQ_SEND;
		1335	}
		1336
		1337	int
		1338	aioreq_pri (int pri = 0)
731	CODE:	1339	CODE:
		1340	RETVAL = next_pri;
		1341	if (items > 0)
		1342	{
		1343	if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
		1344	if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
		1345	next_pri = pri;
		1346	}
		1347	OUTPUT:
		1348	RETVAL
		1349
		1350	void
		1351	aioreq_nice (int nice = 0)
		1352	CODE:
		1353	nice = next_pri - nice;
		1354	if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
		1355	if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
		1356	next_pri = nice;
		1357
		1358	void
		1359	flush ()
		1360	CODE:
732	while (nreqs)	1361	while (eio_nreqs ())
733	{	1362	{
734	poll_wait ();	1363	poll_wait ();
735	poll_cb ();	1364	poll_cb ();
736	}	1365	}
737		1366
738	void	1367	int
739	poll()	1368	poll ()
740	PROTOTYPE:
741	CODE:	1369	CODE:
742	if (nreqs)
743	{
744	poll_wait ();	1370	poll_wait ();
745	poll_cb ();	1371	RETVAL = poll_cb ();
746	}
747
748	int
749	poll_fileno()
750	PROTOTYPE:
751	CODE:
752	RETVAL = respipe [0];
753	OUTPUT:	1372	OUTPUT:
754	RETVAL	1373	RETVAL
755		1374
756	int	1375	int
		1376	poll_fileno ()
		1377	CODE:
		1378	RETVAL = s_epipe_fd (&respipe);
		1379	OUTPUT:
		1380	RETVAL
		1381
		1382	int
757	poll_cb(...)	1383	poll_cb (...)
758	PROTOTYPE:	1384	PROTOTYPE:
759	CODE:	1385	CODE:
760	RETVAL = poll_cb ();	1386	RETVAL = poll_cb ();
761	OUTPUT:	1387	OUTPUT:
762	RETVAL	1388	RETVAL
763		1389
764	void	1390	void
765	poll_wait()	1391	poll_wait ()
766	PROTOTYPE:
767	CODE:	1392	CODE:
768	if (nreqs)
769	poll_wait ();	1393	poll_wait ();
770		1394
771	int	1395	int
772	nreqs()	1396	nreqs ()
773	PROTOTYPE:
774	CODE:	1397	CODE:
775	RETVAL = nreqs;	1398	RETVAL = eio_nreqs ();
776	OUTPUT:	1399	OUTPUT:
777	RETVAL	1400	RETVAL
778		1401
		1402	int
		1403	nready ()
		1404	CODE:
		1405	RETVAL = eio_nready ();
		1406	OUTPUT:
		1407	RETVAL
		1408
		1409	int
		1410	npending ()
		1411	CODE:
		1412	RETVAL = eio_npending ();
		1413	OUTPUT:
		1414	RETVAL
		1415
		1416	int
		1417	nthreads ()
		1418	CODE:
		1419	RETVAL = eio_nthreads ();
		1420	OUTPUT:
		1421	RETVAL
		1422
		1423	int
		1424	fadvise (aio_rfd fh, off_t offset, off_t length, IV advice)
		1425	CODE:
		1426	RETVAL = posix_fadvise (fh, offset, length, advice);
		1427	OUTPUT:
		1428	RETVAL
		1429
		1430	ssize_t
		1431	sendfile (aio_wfd ofh, aio_rfd ifh, off_t offset, size_t count)
		1432	CODE:
		1433	RETVAL = eio_sendfile_sync (ofh, ifh, offset, count);
		1434	OUTPUT:
		1435	RETVAL
		1436
		1437	void
		1438	mmap (SV *scalar, size_t length, int prot, int flags, SV *fh, off_t offset = 0)
		1439	PPCODE:
		1440	sv_unmagic (scalar, MMAP_MAGIC);
		1441	{
		1442	int fd = SvOK (fh) ? s_fileno_croak (fh, flags & PROT_WRITE) : -1;
		1443	void *addr = (void *)mmap (0, length, prot, flags, fd, offset);
		1444	if (addr == (void *)-1)
		1445	XSRETURN_NO;
		1446
		1447	sv_force_normal (scalar);
		1448
		1449	/* we store the length in mg_obj, as namlen is I32 :/ */
		1450	sv_magicext (scalar, 0, MMAP_MAGIC, &mmap_vtbl, (char *)addr, 0)
		1451	->mg_obj = (SV *)length;
		1452
		1453	SvUPGRADE (scalar, SVt_PV); /* nop... */
		1454
		1455	if (!(prot & PROT_WRITE))
		1456	SvREADONLY_on (scalar);
		1457
		1458	if (SvLEN (scalar))
		1459	Safefree (SvPVX (scalar));
		1460
		1461	SvPVX (scalar) = (char *)addr;
		1462	SvCUR_set (scalar, length);
		1463	SvLEN_set (scalar, 0);
		1464	SvPOK_only (scalar);
		1465
		1466	XSRETURN_YES;
		1467	}
		1468
		1469	void
		1470	munmap (SV *scalar)
		1471	CODE:
		1472	sv_unmagic (scalar, MMAP_MAGIC);
		1473
		1474	int
		1475	madvise (SV *scalar, off_t offset = 0, SV *length = &PL_sv_undef, IV advice_or_prot)
		1476	ALIAS:
		1477	mprotect = 1
		1478	CODE:
		1479	{
		1480	STRLEN svlen;
		1481	void *addr = SvPVbyte (scalar, svlen);
		1482	size_t len = SvUV (length);
		1483
		1484	if (offset < 0)
		1485	offset += svlen;
		1486
		1487	if (offset < 0 || offset > svlen)
		1488	croak ("offset outside of scalar");
		1489
		1490	if (!SvOK (length) || len + offset > svlen)
		1491	len = svlen - offset;
		1492
		1493	addr = (void *)(((intptr_t)addr) + offset);
		1494	eio_page_align (&addr, &len);
		1495
		1496	switch (ix)
		1497	{
		1498	case 0: RETVAL = posix_madvise (addr, len, advice_or_prot); break;
		1499	case 1: RETVAL = mprotect (addr, len, advice_or_prot); break;
		1500	}
		1501	}
		1502	OUTPUT:
		1503	RETVAL
		1504
		1505	int
		1506	munlock (SV *scalar, off_t offset = 0, SV *length = &PL_sv_undef)
		1507	CODE:
		1508	{
		1509	STRLEN svlen;
		1510	void *addr = SvPVbyte (scalar, svlen);
		1511	size_t len = SvUV (length);
		1512
		1513	if (offset < 0)
		1514	offset += svlen;
		1515
		1516	if (offset < 0 || offset > svlen)
		1517	croak ("offset outside of scalar");
		1518
		1519	if (!SvOK (length) || len + offset > svlen)
		1520	len = svlen - offset;
		1521
		1522	addr = (void *)(((intptr_t)addr) + offset);
		1523	eio_page_align (&addr, &len);
		1524	#if _POSIX_MEMLOCK
		1525	RETVAL = munlock (addr, len);
		1526	#else
		1527	RETVAL = ((errno = ENOSYS), -1);
		1528	#endif
		1529	}
		1530	OUTPUT:
		1531	RETVAL
		1532
		1533	int
		1534	munlockall ()
		1535	CODE:
		1536	#if _POSIX_MEMLOCK
		1537	munlockall ();
		1538	#else
		1539	RETVAL = -1;
		1540	errno = ENOSYS;
		1541	#endif
		1542	OUTPUT:
		1543	RETVAL
		1544
		1545	void _on_next_submit (SV *cb)
		1546	CODE:
		1547	SvREFCNT_dec (on_next_submit);
		1548	on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
		1549
		1550	PROTOTYPES: DISABLE
		1551
		1552	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1553
		1554	void
		1555	cancel (aio_req_ornot req)
		1556	CODE:
		1557	eio_cancel (req);
		1558
		1559	void
		1560	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1561	PPCODE:
		1562	{
		1563	if (GIMME_V != G_VOID)
		1564	XPUSHs (req->callback ? sv_2mortal (newRV_inc (req->callback)) : &PL_sv_undef);
		1565
		1566	if (items > 1)
		1567	{
		1568	SV *cb_cv =get_cb (callback);
		1569
		1570	SvREFCNT_dec (req->callback);
		1571	req->callback = SvREFCNT_inc (cb_cv);
		1572	}
		1573	}
		1574
		1575	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1576
		1577	void
		1578	add (aio_req grp, ...)
		1579	PPCODE:
		1580	{
		1581	int i;
		1582
		1583	if (grp->int1 == 2)
		1584	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1585
		1586	for (i = 1; i < items; ++i )
		1587	{
		1588	aio_req req;
		1589
		1590	if (GIMME_V != G_VOID)
		1591	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1592
		1593	req = SvAIO_REQ (ST (i));
		1594
		1595	if (req)
		1596	eio_grp_add (grp, req);
		1597	}
		1598	}
		1599
		1600	void
		1601	cancel_subs (aio_req_ornot req)
		1602	CODE:
		1603	req_cancel_subs (req);
		1604
		1605	void
		1606	result (aio_req grp, ...)
		1607	CODE:
		1608	{
		1609	int i;
		1610	AV *av;
		1611
		1612	grp->errorno = errno;
		1613
		1614	av = newAV ();
		1615	av_extend (av, items - 1);
		1616
		1617	for (i = 1; i < items; ++i )
		1618	av_push (av, newSVsv (ST (i)));
		1619
		1620	SvREFCNT_dec (grp->sv1);
		1621	grp->sv1 = (SV *)av;
		1622	}
		1623
		1624	void
		1625	errno (aio_req grp, int errorno = errno)
		1626	CODE:
		1627	grp->errorno = errorno;
		1628
		1629	void
		1630	limit (aio_req grp, int limit)
		1631	CODE:
		1632	eio_grp_limit (grp, limit);
		1633
		1634	void
		1635	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1636	CODE:
		1637	{
		1638	SvREFCNT_dec (grp->sv2);
		1639	grp->sv2 = newSVsv (callback);
		1640	grp->feed = aio_grp_feed;
		1641
		1642	if (grp->int2 <= 0)
		1643	grp->int2 = 2;
		1644
		1645	eio_grp_limit (grp, grp->int2);
		1646	}
		1647

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