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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.25 by root, Wed Aug 17 03:16:56 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_mutex_t frklock = PTHREAD_MUTEX_INITIALIZER;
68	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
69		260
70	static volatile aio_req reqs, reqe; /* queue start, queue end */	261	static void req_destroy (aio_req req);
71	static volatile aio_req ress, rese; /* queue start, queue end */	262	static void req_cancel (aio_req req);
72		263
73	static void	264	static void want_poll (void)
74	poll_wait ()
75	{	265	{
76	if (nreqs && !ress)	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	{
		279	if (!req->self)
77	{	280	{
78	fd_set rfd;	281	req->self = (SV *)newHV ();
79	FD_ZERO(&rfd);	282	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
80	FD_SET(respipe [0], &rfd);
81
82	select (respipe [0] + 1, &rfd, 0, 0, 0);
83	}	283	}
84	}
85		284
86	static int	285	return sv_2mortal (sv_bless (newRV_inc (req->self), stash));
87	poll_cb ()	286	}
88	{
89	dSP;
90	int count = 0;
91	int do_croak = 0;
92	aio_req req, prv;
93		287
94	pthread_mutex_lock (&reslock);	288	static aio_req SvAIO_REQ (SV *sv)
		289	{
		290	MAGIC *mg;
95		291
96	{	292	if (!SvROK (sv)
97	/* read any signals sent by the worker threads */	293	|| (SvSTASH (SvRV (sv)) != aio_grp_stash
98	char buf [32];	294	&& SvSTASH (SvRV (sv)) != aio_req_stash
99	while (read (respipe [0], buf, 32) == 32)	295	&& !sv_derived_from (sv, "IO::AIO::REQ")))
100	;	296	croak ("object of class IO::AIO::REQ expected");
101	}
102		297
103	req = ress;	298	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
104	ress = rese = 0;
105		299
106	pthread_mutex_unlock (&reslock);	300	return mg ? (aio_req)mg->mg_ptr : 0;
		301	}
107		302
108	while (req)	303	static void aio_grp_feed (aio_req grp)
		304	{
		305	if (grp->sv2 && SvOK (grp->sv2))
109	{	306	{
110	nreqs--;	307	dSP;
111		308
112	if (req->type == REQ_QUIT)	309	ENTER;
113	started--;	310	SAVETMPS;
114	else	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))
115	{	356	{
116	int errorno = errno;	357	sv_result = sv_result_cache; sv_result_cache = 0;
117	errno = req->errorno;	358	SvIV_set (sv_result, req->result);
118
119	if (req->type == REQ_READ)
120	SvCUR_set (req->data, req->dataoffset
121	+ req->result > 0 ? req->result : 0);
122
123	if (req->data)
124	SvREFCNT_dec (req->data);
125
126	if (req->fh)
127	SvREFCNT_dec (req->fh);
128
129	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
130	{
131	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
132	PL_laststatval = req->result;
133	PL_statcache = *(req->statdata);
134
135	Safefree (req->statdata);
136	}
137
138	ENTER;
139	PUSHMARK (SP);
140	XPUSHs (sv_2mortal (newSViv (req->result)));
141
142	if (req->type == REQ_OPEN)
143	{
144	/* convert fd to fh */
145	SV *fh;
146
147	PUTBACK;
148	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
149	SPAGAIN;
150
151	fh = SvREFCNT_inc (POPs);
152
153	PUSHMARK (SP);
154	XPUSHs (sv_2mortal (fh));
155	}
156
157	if (SvOK (req->callback))
158	{
159	PUTBACK;
160	call_sv (req->callback, G_VOID | G_EVAL);
161	SPAGAIN;
162	}
163
164	do_croak = SvTRUE (ERRSV);
165
166	LEAVE;
167
168	if (req->callback)
169	SvREFCNT_dec (req->callback);
170
171	errno = errorno;
172	count++;
173	}
174
175	prv = req;
176	req = req->next;
177	Safefree (prv);
178
179	if (do_croak)
180	croak (0);
181	}
182
183	return count;
184	}
185
186	static void *aio_proc(void *arg);
187
188	static void
189	start_thread (void)
190	{
191	sigset_t fullsigset, oldsigset;
192	pthread_t tid;
193	pthread_attr_t attr;
194
195	pthread_attr_init (&attr);
196	pthread_attr_setstacksize (&attr, STACKSIZE);
197	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
198
199	sigfillset (&fullsigset);
200	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
201
202	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
203	started++;
204
205	sigprocmask (SIG_SETMASK, &oldsigset, 0);
206	}
207
208	static void
209	send_req (aio_req req)
210	{
211	nreqs++;
212
213	pthread_mutex_lock (&reqlock);
214
215	req->next = 0;
216
217	if (reqe)
218	{
219	reqe->next = req;
220	reqe = req;
221	}
222	else
223	reqe = reqs = req;
224
225	pthread_cond_signal (&reqwait);
226	pthread_mutex_unlock (&reqlock);
227
228	while (nreqs > max_outstanding)
229	{
230	poll_wait ();
231	poll_cb ();
232	}
233	}
234
235	static void
236	end_thread (void)
237	{
238	aio_req req;
239	New (0, req, 1, aio_cb);
240	req->type = REQ_QUIT;
241
242	send_req (req);
243	}
244
245
246	static void min_parallel (int nthreads)
247	{
248	while (nthreads > started)
249	start_thread ();
250	}
251
252	static void max_parallel (int nthreads)
253	{
254	int cur = started;
255	while (cur > nthreads)
256	{
257	end_thread ();
258	cur--;
259	}
260
261	while (started > nthreads)
262	{
263	poll_wait ();
264	poll_cb ();
265	}
266	}
267
268	static int fork_started;
269
270	static void atfork_prepare (void)
271	{
272	int nstarted;
273
274	for (;;) {
275	while (nreqs)
276	{
277	poll_wait ();
278	poll_cb ();
279	}
280
281	nstarted = started;
282	max_parallel (0);
283
284	pthread_mutex_lock (&reqlock);
285
286	if (!nreqs && !started)
287	break;
288
289	pthread_mutex_unlock (&reqlock);
290
291	min_parallel (fork_started);
292	}
293
294	pthread_mutex_lock (&frklock);
295	fork_started = nstarted;
296	pthread_mutex_lock (&reslock);
297
298	assert (!started);
299	assert (!nreqs);
300	assert (!reqs && !reqe);
301	assert (!ress && !rese);
302	}
303
304	static void atfork_parent (void)
305	{
306	pthread_mutex_unlock (&reslock);
307	pthread_mutex_unlock (&frklock);
308	pthread_mutex_unlock (&reqlock);
309
310	min_parallel (fork_started);
311	}
312
313	#define atfork_child atfork_parent
314
315	/*****************************************************************************/
316	/* work around various missing functions */
317
318	#if !HAVE_PREADWRITE
319	# define pread aio_pread
320	# define pwrite aio_pwrite
321
322	/*
323	* make our pread/pwrite safe against themselves, but not against
324	* normal read/write by using a mutex. slows down execution a lot,
325	* but that's your problem, not mine.
326	*/
327	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;
328
329	static ssize_t
330	pread (int fd, void *buf, size_t count, off_t offset)
331	{
332	ssize_t res;
333	off_t ooffset;
334
335	pthread_mutex_lock (&iolock);
336	ooffset = lseek (fd, 0, SEEK_CUR);
337	lseek (fd, offset, SEEK_SET);
338	res = read (fd, buf, count);
339	lseek (fd, ooffset, SEEK_SET);
340	pthread_mutex_unlock (&iolock);
341
342	return res;
343	}
344
345	static ssize_t
346	pwrite (int fd, void *buf, size_t count, off_t offset)
347	{
348	ssize_t res;
349	off_t ooffset;
350
351	pthread_mutex_lock (&iolock);
352	ooffset = lseek (fd, 0, SEEK_CUR);
353	lseek (fd, offset, SEEK_SET);
354	res = write (fd, buf, count);
355	lseek (fd, offset, SEEK_SET);
356	pthread_mutex_unlock (&iolock);
357
358	return res;
359	}
360	#endif
361
362	#if !HAVE_FDATASYNC
363	# define fdatasync fsync
364	#endif
365
366	#if !HAVE_READAHEAD
367	# define readahead aio_readahead
368
369	static char readahead_buf[4096];
370
371	static ssize_t
372	readahead (int fd, off_t offset, size_t count)
373	{
374	while (count > 0)
375	{
376	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
377
378	pread (fd, readahead_buf, len, offset);
379	offset += len;
380	count -= len;
381	}
382
383	errno = 0;
384	}
385	#endif
386
387	/*****************************************************************************/
388
389	static void *
390	aio_proc (void *thr_arg)
391	{
392	aio_req req;
393	int type;
394
395	do
396	{
397	pthread_mutex_lock (&reqlock);
398
399	for (;;)
400	{
401	req = reqs;
402
403	if (reqs)
404	{
405	reqs = reqs->next;
406	if (!reqs) reqe = 0;
407	}
408
409	if (req)
410	break;
411
412	pthread_cond_wait (&reqwait, &reqlock);
413	}
414
415	pthread_mutex_unlock (&reqlock);
416
417	errno = 0; /* strictly unnecessary */
418
419	type = req->type;
420
421	switch (type)
422	{
423	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
424	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
425
426	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
427
428	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
429	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
430	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
431
432	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
433	case REQ_CLOSE: req->result = close (req->fd); break;
434	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
435	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
436	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
437
438	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
439	case REQ_FSYNC: req->result = fsync (req->fd); break;
440
441	case REQ_QUIT:
442	break;
443
444	default:
445	req->result = ENOSYS;
446	break;
447	}
448
449	req->errorno = errno;
450
451	pthread_mutex_lock (&reslock);
452
453	req->next = 0;
454
455	if (rese)
456	{
457	rese->next = req;
458	rese = req;
459	}	359	}
460	else	360	else
461	{	361	{
462	rese = ress = req;	362	sv_result = newSViv (req->result);
463		363	SvREADONLY_on (sv_result);
464	/* write a dummy byte to the pipe so fh becomes ready */
465	write (respipe [1], &respipe, 1);
466	}	364	}
467		365
468	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;
469	}	557	}
470	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);
471		664
472	return 0;	665	return 0;
473	}	666	}
474		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
475	#define dREQ \	681	#define dREQ \
		682	SV *cb_cv; \
476	aio_req req; \	683	aio_req req; \
		684	int req_pri = next_pri; \
		685	next_pri = EIO_PRI_DEFAULT; \
477	\	686	\
478	if (SvOK (callback) && !SvROK (callback)) \	687	cb_cv = get_cb (callback); \
479	croak ("clalback must be undef or of reference type"); \
480	\	688	\
481	Newz (0, req, 1, aio_cb); \	689	Newz (0, req, 1, eio_req); \
482	if (!req) \	690	if (!req) \
483	croak ("out of memory during aio_req allocation"); \	691	croak ("out of memory during eio_req allocation"); \
484	\	692	\
485	req->callback = SvREFCNT_inc (callback);	693	req->callback = SvREFCNT_inc (cb_cv); \
486		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
487	MODULE = IO::AIO PACKAGE = IO::AIO	704	MODULE = IO::AIO PACKAGE = IO::AIO
488		705
489	PROTOTYPES: ENABLE	706	PROTOTYPES: ENABLE
490		707
491	BOOT:	708	BOOT:
492	{	709	{
493	if (pipe (respipe))	710	static const struct {
494	croak ("unable to initialize result pipe");	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)
495		735
496	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	736	const_niv (MADV_NORMAL , POSIX_MADV_NORMAL)
497	croak ("cannot set result pipe to nonblocking mode");	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)
498		741
499	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	742	const_iv (ST_RDONLY)
500	croak ("cannot set result pipe to nonblocking mode");	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)
501		754
502	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	755	const_iv (PROT_NONE)
503	}	756	const_iv (PROT_EXEC)
		757	const_iv (PROT_READ)
		758	const_iv (PROT_WRITE)
504		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
		810	create_respipe ();
		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
505	void	819	void
506	min_parallel(nthreads)	820	max_poll_reqs (int nreqs)
507	int nthreads
508	PROTOTYPE: $	821	PROTOTYPE: $
		822	CODE:
		823	eio_set_max_poll_reqs (nreqs);
509		824
510	void	825	void
511	max_parallel(nthreads)	826	max_poll_time (double nseconds)
512	int nthreads
513	PROTOTYPE: $	827	PROTOTYPE: $
514
515	int
516	max_outstanding(nreqs)
517	int nreqs
518	PROTOTYPE: $
519	CODE:	828	CODE:
520	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:
521	max_outstanding = nreqs;	853	max_outstanding = maxreqs;
522		854
523	void	855	void
524	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	856	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
525	SV * pathname
526	int flags
527	int mode
528	SV * callback
529	PROTOTYPE: $$$;$
530	CODE:	857	PPCODE:
531	{	858	{
532	dREQ;	859	dREQ;
533		860
534	req->type = REQ_OPEN;	861	req->type = EIO_OPEN;
535	req->data = newSVsv (pathname);	862	req->sv1 = newSVsv (pathname);
536	req->dataptr = SvPVbyte_nolen (req->data);	863	req->ptr1 = SvPVbyte_nolen (req->sv1);
537	req->fd = flags;	864	req->int1 = flags;
538	req->mode = mode;	865	req->int2 = mode;
539		866
540	send_req (req);	867	REQ_SEND;
541	}	868	}
542		869
543	void	870	void
544	aio_close(fh,callback=&PL_sv_undef)	871	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
545	SV * fh
546	SV * callback
547	PROTOTYPE: $;$
548	ALIAS:	872	ALIAS:
549	aio_close = REQ_CLOSE
550	aio_fsync = REQ_FSYNC	873	aio_fsync = EIO_FSYNC
551	aio_fdatasync = REQ_FDATASYNC	874	aio_fdatasync = EIO_FDATASYNC
552	CODE:	875	PPCODE:
553	{	876	{
		877	int fd = s_fileno_croak (fh, 0);
554	dREQ;	878	dREQ;
555		879
556	req->type = ix;	880	req->type = ix;
557	req->fh = newSVsv (fh);	881	req->sv1 = newSVsv (fh);
558	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	882	req->int1 = fd;
559		883
560	send_req (req);	884	REQ_SEND (req);
561	}	885	}
562		886
563	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
564	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)
565	SV * fh
566	UV offset
567	IV length
568	SV * data
569	IV dataoffset
570	SV * callback
571	ALIAS:	934	ALIAS:
572	aio_read = REQ_READ	935	aio_read = EIO_READ
573	aio_write = REQ_WRITE	936	aio_write = EIO_WRITE
574	PROTOTYPE: $$$$$;$
575	CODE:	937	PPCODE:
576	{	938	{
577	aio_req req;
578	STRLEN svlen;	939	STRLEN svlen;
		940	int fd = s_fileno_croak (fh, ix == EIO_WRITE);
579	char *svptr = SvPVbyte (data, svlen);	941	char *svptr = SvPVbyte (data, svlen);
580		942	UV len = SvUV (length);
581	SvUPGRADE (data, SVt_PV);
582	SvPOK_on (data);
583		943
584	if (dataoffset < 0)	944	if (dataoffset < 0)
585	dataoffset += svlen;	945	dataoffset += svlen;
586		946
587	if (dataoffset < 0 || dataoffset > svlen)	947	if (dataoffset < 0 || dataoffset > svlen)
588	croak ("data offset outside of string");	948	croak ("dataoffset outside of data scalar");
589		949
590	if (ix == REQ_WRITE)	950	if (ix == EIO_WRITE)
591	{	951	{
592	/* write: check length and adjust. */	952	/* write: check length and adjust. */
593	if (length < 0 || length + dataoffset > svlen)	953	if (!SvOK (length) || len + dataoffset > svlen)
594	length = svlen - dataoffset;	954	len = svlen - dataoffset;
595	}	955	}
596	else	956	else
597	{	957	{
598	/* read: grow scalar as necessary */	958	/* read: check type and grow scalar as necessary */
		959	SvUPGRADE (data, SVt_PV);
599	svptr = SvGROW (data, length + dataoffset);	960	svptr = SvGROW (data, len + dataoffset + 1);
600	}	961	}
601
602	if (length < 0)
603	croak ("length must not be negative");
604		962
605	{	963	{
606	dREQ;	964	dREQ;
607		965
608	req->type = ix;	966	req->type = ix;
609	req->fh = newSVsv (fh);	967	req->sv1 = newSVsv (fh);
610	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	968	req->int1 = fd;
611	: IoOFP (sv_2io (fh)));	969	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
612	req->offset = offset;	970	req->size = len;
613	req->length = length;
614	req->data = SvREFCNT_inc (data);	971	req->sv2 = SvREFCNT_inc (data);
615	req->dataptr = (char *)svptr + dataoffset;	972	req->ptr2 = (char *)svptr + dataoffset;
616	req->callback = SvREFCNT_inc (callback);	973	req->stroffset = dataoffset;
617		974
618	send_req (req);	975	if (!SvREADONLY (data))
		976	{
		977	SvREADONLY_on (data);
		978	req->flags |= FLAG_SV2_RO_OFF;
		979	}
		980
		981	REQ_SEND;
619	}	982	}
620	}	983	}
621		984
622	void	985	void
623	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	986	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
624	SV * fh
625	UV offset
626	IV length
627	SV * callback
628	PROTOTYPE: $$$;$
629	CODE:	987	PPCODE:
630	{	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);
631	dREQ;	1005	dREQ;
632		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
633	req->type = REQ_READAHEAD;	1025	req->type = EIO_READAHEAD;
634	req->fh = newSVsv (fh);	1026	req->sv1 = newSVsv (fh);
635	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1027	req->int1 = fd;
636	req->offset = offset;	1028	req->offs = offset;
637	req->length = length;	1029	req->size = length;
638		1030
639	send_req (req);	1031	REQ_SEND;
640	}	1032	}
641		1033
642	void	1034	void
643	aio_stat(fh_or_path,callback=&PL_sv_undef)	1035	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
644	SV * fh_or_path
645	SV * callback
646	ALIAS:	1036	ALIAS:
647	aio_stat = REQ_STAT	1037	aio_stat = EIO_STAT
648	aio_lstat = REQ_LSTAT	1038	aio_lstat = EIO_LSTAT
		1039	aio_statvfs = EIO_STATVFS
649	CODE:	1040	PPCODE:
650	{	1041	{
651	dREQ;	1042	dREQ;
652		1043
653	New (0, req->statdata, 1, Stat_t);	1044	req->sv1 = newSVsv (fh_or_path);
654	if (!req->statdata)
655	croak ("out of memory during aio_req->statdata allocation (sorry, i just leaked memory, too)");
656		1045
657	if (SvPOK (fh_or_path))	1046	if (SvPOK (req->sv1))
658	{	1047	{
659	req->type = ix;	1048	req->type = ix;
660	req->data = newSVsv (fh_or_path);
661	req->dataptr = SvPVbyte_nolen (req->data);	1049	req->ptr1 = SvPVbyte_nolen (req->sv1);
662	}	1050	}
663	else	1051	else
664	{	1052	{
665	req->type = REQ_FSTAT;	1053	req->type = ix == EIO_STATVFS ? EIO_FSTATVFS : EIO_FSTAT;
666	req->fh = newSVsv (fh_or_path);
667	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1054	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
668	}	1055	}
669		1056
670	send_req (req);	1057	REQ_SEND;
671	}	1058	}
672		1059
673	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
674	aio_unlink(pathname,callback=&PL_sv_undef)	1175	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
675	SV * pathname
676	SV * callback
677	ALIAS:	1176	ALIAS:
678	aio_unlink = REQ_UNLINK	1177	aio_unlink = EIO_UNLINK
679	aio_rmdir = REQ_RMDIR	1178	aio_rmdir = EIO_RMDIR
		1179	aio_readdir = EIO_READDIR
680	CODE:	1180	PPCODE:
681	{	1181	{
682	dREQ;	1182	dREQ;
683		1183
684	req->type = ix;	1184	req->type = ix;
685	req->data = newSVsv (pathname);	1185	req->sv1 = newSVsv (pathname);
686	req->dataptr = SvPVbyte_nolen (req->data);	1186	req->ptr1 = SvPVbyte_nolen (req->sv1);
687
688	send_req (req);
689	}
690		1187
		1188	REQ_SEND;
		1189	}
		1190
691	void	1191	void
692	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1192	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
693	SV * oldpath	1193	ALIAS:
694	SV * newpath	1194	aio_link = EIO_LINK
695	SV * callback	1195	aio_symlink = EIO_SYMLINK
		1196	aio_rename = EIO_RENAME
696	CODE:	1197	PPCODE:
697	{	1198	{
698	dREQ;	1199	dREQ;
699		1200
700	req->type = REQ_SYMLINK;	1201	req->type = ix;
701	req->fh = newSVsv (oldpath);	1202	req->sv1 = newSVsv (oldpath);
702	req->data2ptr = SvPVbyte_nolen (req->fh);	1203	req->ptr1 = SvPVbyte_nolen (req->sv1);
703	req->data = newSVsv (newpath);	1204	req->sv2 = newSVsv (newpath);
704	req->dataptr = SvPVbyte_nolen (req->data);	1205	req->ptr2 = SvPVbyte_nolen (req->sv2);
705		1206
706	send_req (req);	1207	REQ_SEND;
707	}	1208	}
708		1209
709	void	1210	void
710	flush()	1211	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
711	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)
712	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:
713	while (nreqs)	1361	while (eio_nreqs ())
714	{	1362	{
715	poll_wait ();	1363	poll_wait ();
716	poll_cb ();	1364	poll_cb ();
717	}	1365	}
718		1366
719	void	1367	int
720	poll()	1368	poll ()
721	PROTOTYPE:
722	CODE:	1369	CODE:
723	if (nreqs)
724	{
725	poll_wait ();	1370	poll_wait ();
726	poll_cb ();	1371	RETVAL = poll_cb ();
727	}
728
729	int
730	poll_fileno()
731	PROTOTYPE:
732	CODE:
733	RETVAL = respipe [0];
734	OUTPUT:	1372	OUTPUT:
735	RETVAL	1373	RETVAL
736		1374
737	int	1375	int
		1376	poll_fileno ()
		1377	CODE:
		1378	RETVAL = s_epipe_fd (&respipe);
		1379	OUTPUT:
		1380	RETVAL
		1381
		1382	int
738	poll_cb(...)	1383	poll_cb (...)
739	PROTOTYPE:	1384	PROTOTYPE:
740	CODE:	1385	CODE:
741	RETVAL = poll_cb ();	1386	RETVAL = poll_cb ();
742	OUTPUT:	1387	OUTPUT:
743	RETVAL	1388	RETVAL
744		1389
745	void	1390	void
746	poll_wait()	1391	poll_wait ()
747	PROTOTYPE:
748	CODE:	1392	CODE:
749	if (nreqs)
750	poll_wait ();	1393	poll_wait ();
751		1394
752	int	1395	int
753	nreqs()	1396	nreqs ()
754	PROTOTYPE:
755	CODE:	1397	CODE:
756	RETVAL = nreqs;	1398	RETVAL = eio_nreqs ();
757	OUTPUT:	1399	OUTPUT:
758	RETVAL	1400	RETVAL
759		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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