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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.37 by root, Tue Aug 23 12:37:19 2005 UTC vs.
Revision 1.239 by root, Tue Feb 23 19:42:43 2016 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	#include <pthread.h>
11		10
12	#include <stddef.h>	11	#include <stddef.h>
		12	#include <stdlib.h>
		13	#include <errno.h>
13	#include <sys/types.h>	14	#include <sys/types.h>
14	#include <sys/stat.h>	15	#include <sys/stat.h>
15	#include <limits.h>	16	#include <limits.h>
16	#include <unistd.h>
17	#include <fcntl.h>	17	#include <fcntl.h>
18	#include <signal.h>
19	#include <sched.h>	18	#include <sched.h>
20		19
21	#if HAVE_SENDFILE	20	#if _POSIX_MEMLOCK || _POSIX_MEMLOCK_RANGE || _POSIX_MAPPED_FILES
22	# if __linux
23	# include <sys/sendfile.h>
24	# elif __freebsd
25	# include <sys/socket.h>
26	# include <sys/uio.h>	21	# include <sys/mman.h>
27	# elif __hpux	22	#endif
		23
		24	/* the incompetent fool that created musl keeps __linux__, refuses
		25	* to implement any linux standard apis, and also has no way to test
		26	* for his broken iplementation. on't complain if this fails for you.
		27	*/
		28	#if __linux__ && (defined __GLIBC__ || defined __UCLIBC__)
		29	# include <linux/fs.h>
		30	# ifdef FS_IOC_FIEMAP
		31	# include <linux/types.h>
		32	# include <linux/fiemap.h>
		33	# define HAVE_FIEMAP 1
		34	# endif
		35	#endif
		36
		37	/* perl namespace pollution */
		38	#undef VERSION
		39
		40	/* perl stupidly overrides readdir and maybe others */
		41	/* with thread-unsafe versions, imagine that :( */
		42	#undef readdir
		43	#undef opendir
		44	#undef closedir
		45
		46	#ifdef _WIN32
		47
		48	// perl overrides all those nice libc functions
		49
		50	#undef malloc
		51	#undef free
		52	#undef open
		53	#undef read
		54	#undef write
		55	#undef send
		56	#undef recv
		57	#undef stat
		58	#undef lstat
		59	#undef fstat
		60	#undef truncate
		61	#undef ftruncate
		62	#undef open
		63	#undef link
		64	#undef close
		65	#undef unlink
		66	#undef mkdir
		67	#undef rmdir
		68	#undef rename
		69	#undef lseek
		70	#undef opendir
		71	#undef readdir
		72	#undef closedir
		73	#undef chmod
		74	#undef fchmod
		75	#undef dup
		76	#undef dup2
		77	#undef abort
		78	#undef pipe
		79
		80	#define EIO_STRUCT_STAT struct _stati64
		81	#define EIO_STRUCT_STATI64
		82
		83	#else
		84
28	# include <sys/socket.h>	85	#include <sys/time.h>
29	# elif __solaris /* not yet */
30	# include <sys/sendfile.h>	86	#include <sys/select.h>
		87	#include <unistd.h>
		88	#include <utime.h>
		89	#include <signal.h>
		90
		91	#define EIO_STRUCT_STAT Stat_t
		92
		93	#endif
		94
		95	/*****************************************************************************/
		96
		97	#if __GNUC__ >= 3
		98	# define expect(expr,value) __builtin_expect ((expr),(value))
		99	#else
		100	# define expect(expr,value) (expr)
		101	#endif
		102
		103	#define expect_false(expr) expect ((expr) != 0, 0)
		104	#define expect_true(expr) expect ((expr) != 0, 1)
		105
		106	/*****************************************************************************/
		107
		108	typedef SV SV8; /* byte-sv, used for argument-checking */
		109	typedef int aio_rfd; /* read file desriptor */
		110	typedef int aio_wfd; /* write file descriptor */
		111
		112	static HV *aio_stash, *aio_req_stash, *aio_grp_stash, *aio_wd_stash;
		113
		114	#define EIO_REQ_MEMBERS \
		115	SV *callback; \
		116	SV *sv1, *sv2; \
		117	SV *sv3, *sv4; \
		118	STRLEN stroffset; \
		119	SV *self;
		120
		121	#define EIO_NO_WRAPPERS 1
		122
		123	#include "libeio/config.h"
		124	#include "libeio/eio.h"
		125
		126	static int req_invoke (eio_req *req);
		127	#define EIO_FINISH(req) req_invoke (req)
		128	static void req_destroy (eio_req *grp);
		129	#define EIO_DESTROY(req) req_destroy (req)
		130
		131	#include "libeio/eio.c"
		132
		133	#if !HAVE_POSIX_FADVISE
		134	# define posix_fadvise(a,b,c,d) errno = ENOSYS /* also return ENOSYS */
		135	#endif
		136
		137	#if !HAVE_POSIX_MADVISE
		138	# define posix_madvise(a,b,c) errno = ENOSYS /* also return ENOSYS */
		139	#endif
		140
		141	#ifndef MAP_ANONYMOUS
		142	# ifdef MAP_ANON
		143	# define MAP_ANONYMOUS MAP_ANON
31	# else	144	# else
32	# error sendfile support requested but not available	145	# define MAP_ANONYMOUS MAP_FIXED /* and hope this fails */
33	# endif	146	# endif
34	#endif	147	#endif
35		148
36	#if __ia64	149	/* defines all sorts of constants to 0 unless they are already defined */
37	# define STACKSIZE 65536	150	/* also provides const_iv_ and const_niv_ macros for them */
38	#else	151	#include "def0.h"
39	# define STACKSIZE 8192
40	#endif
41		152
42	enum {	153	#ifndef makedev
43	REQ_QUIT,	154	# define makedev(maj,min) (((maj) << 8) | (min))
44	REQ_OPEN, REQ_CLOSE,	155	#endif
45	REQ_READ, REQ_WRITE, REQ_READAHEAD,	156	#ifndef major
46	REQ_SENDFILE,	157	# define major(dev) ((dev) >> 8)
47	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	158	#endif
48	REQ_FSYNC, REQ_FDATASYNC,	159	#ifndef minor
49	REQ_UNLINK, REQ_RMDIR,	160	# define minor(dev) ((dev) & 0xff)
50	REQ_READDIR,	161	#endif
51	REQ_SYMLINK,
52	};
53		162
54	typedef struct aio_cb {	163	#if PAGESIZE <= 0
55	struct aio_cb *volatile next;	164	# define PAGESIZE sysconf (_SC_PAGESIZE)
		165	#endif
56		166
57	int type;	167	/*****************************************************************************/
58
59	/* should receive a cleanup, with unions */
60	int fd, fd2;
61	off_t offset;
62	size_t length;
63	ssize_t result;
64	mode_t mode; /* open */
65	int errorno;
66	SV *data, *callback;
67	SV *fh, *fh2;
68	void *dataptr, *data2ptr;
69	STRLEN dataoffset;
70
71	Stat_t *statdata;
72	} aio_cb;
73
74	typedef aio_cb *aio_req;
75
76	static int started, wanted;
77	static volatile int nreqs;
78	static int max_outstanding = 1<<30;
79	static int respipe [2];
80
81	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
82	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
83	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
84
85	static volatile aio_req reqs, reqe; /* queue start, queue end */
86	static volatile aio_req ress, rese; /* queue start, queue end */
87
88	static void free_req (aio_req req)
89	{
90	if (req->data)
91	SvREFCNT_dec (req->data);
92
93	if (req->fh)
94	SvREFCNT_dec (req->fh);
95
96	if (req->fh2)
97	SvREFCNT_dec (req->fh2);
98
99	if (req->statdata)
100	Safefree (req->statdata);
101
102	if (req->callback)
103	SvREFCNT_dec (req->callback);
104
105	if (req->type == REQ_READDIR && req->result >= 0)
106	free (req->data2ptr);
107
108	Safefree (req);
109	}
110		168
111	static void	169	static void
112	poll_wait ()	170	fiemap (eio_req *req)
113	{	171	{
114	if (nreqs && !ress)	172	req->result = -1;
115	{
116	fd_set rfd;
117	FD_ZERO(&rfd);
118	FD_SET(respipe [0], &rfd);
119		173
120	select (respipe [0] + 1, &rfd, 0, 0, 0);	174	#if HAVE_FIEMAP
121	}	175	/* assume some c99 */
122	}	176	struct fiemap *fiemap = 0;
		177	size_t end_offset;
		178	int count = req->int3;
123		179
124	static int	180	req->flags |= EIO_FLAG_PTR1_FREE;
125	poll_cb ()	181
126	{	182	/* heuristic: start with 512 bytes (8 extents), and if that isn't enough, */
127	dSP;	183	/* increase in 3.5kb steps */
		184	if (count < 0)
128	int count = 0;	185	count = 8;
129	int do_croak = 0;	186
130	aio_req req;	187	fiemap = malloc (sizeof (*fiemap) + sizeof (struct fiemap_extent) * count);
		188	errno = ENOMEM;
		189	if (!fiemap)
		190	return;
		191
		192	req->ptr1 = fiemap;
		193
		194	fiemap->fm_start = req->offs;
		195	fiemap->fm_length = req->size;
		196	fiemap->fm_flags = req->int2;
		197	fiemap->fm_extent_count = count;
		198
		199	if (ioctl (req->int1, FS_IOC_FIEMAP, fiemap) < 0)
		200	return;
		201
		202	if (req->int3 >= 0 /* not autosizing */
		203	|| !fiemap->fm_mapped_extents /* no more extents */
		204	|| fiemap->fm_extents [fiemap->fm_mapped_extents - 1].fe_flags & FIEMAP_EXTENT_LAST /* hit eof */)
		205	goto done;
		206
		207	/* else we have to loop -
		208	* it would be tempting (actually I tried that first) to just query the
		209	* number of extents needed, but linux often feels like not returning all
		210	* extents, without telling us it left any out. this complicates
		211	* this quite a bit.
		212	*/
		213
		214	end_offset = fiemap->fm_length + (fiemap->fm_length == FIEMAP_MAX_OFFSET ? 0 : fiemap->fm_start);
131		215
132	for (;;)	216	for (;;)
133	{	217	{
134	pthread_mutex_lock (&reslock);	218	/* we go in 54 extent steps - 3kb, in the hope that this fits nicely on the eio stack (normally 16+ kb) */
135	req = ress;	219	char scratch[3072];
		220	struct fiemap *incmap = (struct fiemap *)scratch;
136		221
		222	incmap->fm_start = fiemap->fm_extents [fiemap->fm_mapped_extents - 1].fe_logical
		223	+ fiemap->fm_extents [fiemap->fm_mapped_extents - 1].fe_length;
		224	incmap->fm_length = fiemap->fm_length - (incmap->fm_start - fiemap->fm_start);
		225	incmap->fm_flags = fiemap->fm_flags;
		226	incmap->fm_extent_count = (sizeof (scratch) - sizeof (struct fiemap)) / sizeof (struct fiemap_extent);
		227
		228	if (ioctl (req->int1, FS_IOC_FIEMAP, incmap) < 0)
		229	return;
		230
		231	if (!incmap->fm_mapped_extents)
		232	goto done;
		233
		234	count = fiemap->fm_mapped_extents + incmap->fm_mapped_extents;
		235	fiemap = realloc (fiemap, sizeof (*fiemap) + sizeof (struct fiemap_extent) * count);
		236	errno = ENOMEM;
137	if (req)	237	if (!fiemap)
		238	return;
		239
		240	req->ptr1 = fiemap;
		241
		242	for (count = 0; count < incmap->fm_mapped_extents; ++count)
138	{	243	{
139	ress = req->next;	244	struct fiemap_extent *e = incmap->fm_extents + count;
140		245
141	if (!ress)	246	if (e->fe_logical + e->fe_length >= end_offset)
142	{	247	goto done;
143	/* read any signals sent by the worker threads */
144	char buf [32];
145	while (read (respipe [0], buf, 32) == 32)
146	;
147		248
148	rese = 0;	249	fiemap->fm_extents [fiemap->fm_mapped_extents++] = *e;
149	}
150	}
151		250
152	pthread_mutex_unlock (&reslock);	251	if (e->fe_flags & FIEMAP_EXTENT_LAST)
		252	goto done;
153		253
154	if (!req)
155	break;
156
157	nreqs--;
158
159	if (req->type == REQ_QUIT)
160	started--;
161	else
162	{
163	int errorno = errno;
164	errno = req->errorno;
165
166	if (req->type == REQ_READ)
167	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
168
169	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
170	SvREADONLY_off (req->data);
171
172	if (req->statdata)
173	{
174	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
175	PL_laststatval = req->result;
176	PL_statcache = *(req->statdata);
177	}
178
179	ENTER;
180	PUSHMARK (SP);
181
182	if (req->type == REQ_READDIR)
183	{
184	SV *rv = &PL_sv_undef;
185
186	if (req->result >= 0)
187	{
188	char *buf = req->data2ptr;
189	AV *av = newAV ();
190
191	while (req->result)
192	{
193	SV *sv = newSVpv (buf, 0);
194
195	av_push (av, sv);
196	buf += SvCUR (sv) + 1;
197	req->result--;
198	}
199
200	rv = sv_2mortal (newRV_noinc ((SV *)av));
201	}
202
203	XPUSHs (rv);
204	}
205	else
206	{
207	XPUSHs (sv_2mortal (newSViv (req->result)));
208
209	if (req->type == REQ_OPEN)
210	{
211	/* convert fd to fh */
212	SV *fh;
213
214	PUTBACK;
215	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
216	SPAGAIN;
217
218	fh = SvREFCNT_inc (POPs);
219
220	PUSHMARK (SP);
221	XPUSHs (sv_2mortal (fh));
222	}
223	}
224
225	if (SvOK (req->callback))
226	{
227	PUTBACK;
228	call_sv (req->callback, G_VOID | G_EVAL);
229	SPAGAIN;
230
231	if (SvTRUE (ERRSV))
232	{
233	free_req (req);
234	croak (0);
235	}
236	}
237
238	LEAVE;
239
240	errno = errorno;
241	count++;
242	}
243
244	free_req (req);
245	}
246
247	return count;
248	}
249
250	static void *aio_proc(void *arg);
251
252	static void
253	start_thread (void)
254	{
255	sigset_t fullsigset, oldsigset;
256	pthread_t tid;
257	pthread_attr_t attr;
258
259	pthread_attr_init (&attr);
260	pthread_attr_setstacksize (&attr, STACKSIZE);
261	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
262
263	sigfillset (&fullsigset);
264	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
265
266	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
267	started++;
268
269	sigprocmask (SIG_SETMASK, &oldsigset, 0);
270	}
271
272	static void
273	send_req (aio_req req)
274	{
275	while (started < wanted && nreqs >= started)
276	start_thread ();
277
278	nreqs++;
279
280	pthread_mutex_lock (&reqlock);
281
282	req->next = 0;
283
284	if (reqe)
285	{
286	reqe->next = req;
287	reqe = req;
288	}
289	else
290	reqe = reqs = req;
291
292	pthread_cond_signal (&reqwait);
293	pthread_mutex_unlock (&reqlock);
294
295	if (nreqs > max_outstanding)
296	for (;;)
297	{
298	poll_cb ();
299
300	if (nreqs <= max_outstanding)
301	break;
302
303	poll_wait ();
304	}
305	}
306
307	static void
308	end_thread (void)
309	{
310	aio_req req;
311	Newz (0, req, 1, aio_cb);
312	req->type = REQ_QUIT;
313
314	send_req (req);
315	}
316
317	static void min_parallel (int nthreads)
318	{
319	if (wanted < nthreads)
320	wanted = nthreads;
321	}
322
323	static void max_parallel (int nthreads)
324	{
325	int cur = started;
326
327	if (wanted > nthreads)
328	wanted = nthreads;
329
330	while (cur > wanted)
331	{
332	end_thread ();
333	cur--;
334	}
335
336	while (started > wanted)
337	{
338	poll_wait ();
339	poll_cb ();
340	}
341	}
342
343	static void create_pipe ()
344	{
345	if (pipe (respipe))
346	croak ("unable to initialize result pipe");
347
348	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
349	croak ("cannot set result pipe to nonblocking mode");
350
351	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
352	croak ("cannot set result pipe to nonblocking mode");
353	}
354
355	/*****************************************************************************/
356	/* work around various missing functions */
357
358	#if !HAVE_PREADWRITE
359	# define pread aio_pread
360	# define pwrite aio_pwrite
361
362	/*
363	* make our pread/pwrite safe against themselves, but not against
364	* normal read/write by using a mutex. slows down execution a lot,
365	* but that's your problem, not mine.
366	*/
367	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
368
369	static ssize_t
370	pread (int fd, void *buf, size_t count, off_t offset)
371	{
372	ssize_t res;
373	off_t ooffset;
374
375	pthread_mutex_lock (&preadwritelock);
376	ooffset = lseek (fd, 0, SEEK_CUR);
377	lseek (fd, offset, SEEK_SET);
378	res = read (fd, buf, count);
379	lseek (fd, ooffset, SEEK_SET);
380	pthread_mutex_unlock (&preadwritelock);
381
382	return res;
383	}
384
385	static ssize_t
386	pwrite (int fd, void *buf, size_t count, off_t offset)
387	{
388	ssize_t res;
389	off_t ooffset;
390
391	pthread_mutex_lock (&preadwritelock);
392	ooffset = lseek (fd, 0, SEEK_CUR);
393	lseek (fd, offset, SEEK_SET);
394	res = write (fd, buf, count);
395	lseek (fd, offset, SEEK_SET);
396	pthread_mutex_unlock (&preadwritelock);
397
398	return res;
399	}
400	#endif
401
402	#if !HAVE_FDATASYNC
403	# define fdatasync fsync
404	#endif
405
406	#if !HAVE_READAHEAD
407	# define readahead aio_readahead
408
409	static ssize_t
410	readahead (int fd, off_t offset, size_t count)
411	{
412	char readahead_buf[4096];
413
414	while (count > 0)
415	{
416	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
417
418	pread (fd, readahead_buf, len, offset);
419	offset += len;
420	count -= len;
421	}
422
423	errno = 0;
424	}
425	#endif
426
427	#if !HAVE_READDIR_R
428	# define readdir_r aio_readdir_r
429
430	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
431
432	static int
433	readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
434	{
435	struct dirent *e;
436	int errorno;
437
438	pthread_mutex_lock (&readdirlock);
439
440	e = readdir (dirp);
441	errorno = errno;
442
443	if (e)
444	{
445	*res = ent;
446	strcpy (ent->d_name, e->d_name);
447	}
448	else
449	*res = 0;
450
451	pthread_mutex_unlock (&readdirlock);
452
453	errno = errorno;
454	return e ? 0 : -1;
455	}
456	#endif
457
458	/* sendfile always needs emulation */
459	static ssize_t
460	sendfile_ (int ofd, int ifd, off_t offset, size_t count)
461	{
462	ssize_t res;
463
464	if (!count)
465	return 0;
466
467	#if HAVE_SENDFILE
468	# if __linux
469	res = sendfile (ofd, ifd, &offset, count);
470
471	# elif __freebsd
472	/*
473	* Of course, the freebsd sendfile is a dire hack with no thoughts
474	* wasted on making it similar to other I/O functions.
475	*/
476	{
477	off_t sbytes;
478	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
479
480	if (res < 0 && sbytes)
481	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
482	res = sbytes;
483	}
484
485	# elif __hpux
486	res = sendfile (ofd, ifd, offset, count, 0, 0);
487
488	# elif __solaris
489	{
490	struct sendfilevec vec;
491	size_t sbytes;
492
493	vec.sfv_fd = ifd;
494	vec.sfv_flag = 0;
495	vec.sfv_off = offset;
496	vec.sfv_len = count;
497
498	res = sendfilev (ofd, &vec, 1, &sbytes);
499
500	if (res < 0 && sbytes)
501	res = sbytes;
502	}
503
504	# else
505	res = -1;
506	errno = ENOSYS;
507	# endif
508	#endif
509
510	if (res < 0
511	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
512	#if __solaris
513	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
514	#endif
515	)
516	)
517	{
518	/* emulate sendfile. this is a major pain in the ass */
519	char buf[4096];
520	res = 0;
521
522	for (;;)
523	{
524	ssize_t cnt;
525
526	cnt = pread (ifd, buf, 4096, offset);
527
528	if (cnt <= 0)
529	{
530	if (cnt && !res) res = -1;
531	break;
532	}
533
534	cnt = write (ofd, buf, cnt);
535
536	if (cnt <= 0)
537	{
538	if (cnt && !res) res = -1;
539	break;
540	}
541
542	offset += cnt;
543	res += cnt;
544	}	254	}
545	}	255	}
546		256
547	return res;	257	done:
548	}	258	req->result = 0;
549		259
550	/* read a full directory */	260	#else
		261	errno = ENOSYS;
		262	#endif
		263	}
		264
		265	/*****************************************************************************/
		266
		267	enum {
		268	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
		269	};
		270
		271	typedef eio_req *aio_req;
		272	typedef eio_req *aio_req_ornot;
		273	typedef eio_wd aio_wd;
		274
		275	static SV *on_next_submit;
		276	static int next_pri = EIO_PRI_DEFAULT;
		277	static int max_outstanding;
		278
		279	static s_epipe respipe;
		280
		281	static void req_destroy (aio_req req);
		282	static void req_cancel (aio_req req);
		283
		284	static void
		285	want_poll (void)
		286	{
		287	/* write a dummy byte to the pipe so fh becomes ready */
		288	s_epipe_signal (&respipe);
		289	}
		290
		291	static void
		292	done_poll (void)
		293	{
		294	/* read any signals sent by the worker threads */
		295	s_epipe_drain (&respipe);
		296	}
		297
		298	/* must be called at most once */
		299	static SV *
		300	req_sv (aio_req req, HV *stash)
		301	{
		302	if (!req->self)
		303	{
		304	req->self = (SV *)newHV ();
		305	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		306	}
		307
		308	return sv_2mortal (sv_bless (newRV_inc (req->self), stash));
		309	}
		310
		311	static SV *
		312	newSVaio_wd (aio_wd wd)
		313	{
		314	return sv_bless (newRV_noinc (newSViv ((intptr_t)wd)), aio_wd_stash);
		315	}
		316
		317	static aio_req
		318	SvAIO_REQ (SV *sv)
		319	{
		320	MAGIC *mg;
		321
		322	if (!SvROK (sv)
		323	/* for speed reasons, we do not verify that SvROK actually has a stash ptr */
		324	|| (SvSTASH (SvRV (sv)) != aio_grp_stash
		325	&& SvSTASH (SvRV (sv)) != aio_req_stash
		326	&& !sv_derived_from (sv, "IO::AIO::REQ")))
		327	croak ("object of class IO::AIO::REQ expected");
		328
		329	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		330
		331	return mg ? (aio_req)mg->mg_ptr : 0;
		332	}
		333
		334	static aio_wd
		335	SvAIO_WD (SV *sv)
		336	{
		337	if (!SvROK (sv)
		338	|| SvTYPE (SvRV (sv)) != SVt_PVMG
		339	|| SvSTASH (SvRV (sv)) != aio_wd_stash)
		340	croak ("IO::AIO: expected a working directory object as returned by aio_wd");
		341
		342	return (aio_wd)(long)SvIVX (SvRV (sv));
		343	}
		344
		345	static SV *
		346	newmortalFH (int fd, int flags)
		347	{
		348	if (fd < 0)
		349	return &PL_sv_undef;
		350
		351	GV *gv = (GV *)sv_newmortal ();
		352	char sym[64];
		353	int symlen;
		354
		355	symlen = snprintf (sym, sizeof (sym), "fd#%d", fd);
		356	gv_init (gv, aio_stash, sym, symlen, 0);
		357
		358	symlen = snprintf (
		359	sym,
		360	sizeof (sym),
		361	"%s&=%d",
		362	flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
		363	fd
		364	);
		365
		366	return do_open (gv, sym, symlen, 0, 0, 0, 0)
		367	? (SV *)gv : &PL_sv_undef;
		368	}
		369
		370	static void
		371	aio_grp_feed (aio_req grp)
		372	{
		373	if (grp->sv2 && SvOK (grp->sv2))
		374	{
		375	dSP;
		376
		377	ENTER;
		378	SAVETMPS;
		379	PUSHMARK (SP);
		380	XPUSHs (req_sv (grp, aio_grp_stash));
		381	PUTBACK;
		382	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		383	SPAGAIN;
		384	FREETMPS;
		385	LEAVE;
		386	}
		387	}
		388
		389	static void
		390	req_submit (eio_req *req)
		391	{
		392	eio_submit (req);
		393
		394	if (expect_false (on_next_submit))
		395	{
		396	dSP;
		397	SV *cb = sv_2mortal (on_next_submit);
		398
		399	on_next_submit = 0;
		400
		401	PUSHMARK (SP);
		402	PUTBACK;
		403	call_sv (cb, G_DISCARD | G_EVAL);
		404	}
		405	}
		406
551	static int	407	static int
552	scandir_ (const char *path, void **namesp)	408	req_invoke (eio_req *req)
553	{	409	{
554	DIR *dirp = opendir (path);	410	if (req->flags & FLAG_SV2_RO_OFF)
555	union	411	SvREADONLY_off (req->sv2);
556	{
557	struct dirent d;
558	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
559	} u;
560	struct dirent *entp;
561	char *name, *names;
562	int memlen = 4096;
563	int memofs = 0;
564	int res = 0;
565	int errorno;
566		412
567	if (!dirp)	413	if (!EIO_CANCELLED (req) && req->callback)
568	return -1;
569
570	names = malloc (memlen);
571
572	for (;;)
573	{	414	{
574	errno = 0, readdir_r (dirp, &u.d, &entp);	415	dSP;
		416	static SV *sv_result_cache; /* caches the result integer SV */
		417	SV *sv_result;
575		418
576	if (!entp)	419	ENTER;
577	break;	420	SAVETMPS;
		421	PUSHMARK (SP);
		422	EXTEND (SP, 1);
578		423
579	name = entp->d_name;	424	/* do not recreate the result IV from scratch each time */
580		425	if (expect_true (sv_result_cache))
581	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
582	{	426	{
583	int len = strlen (name) + 1;	427	sv_result = sv_result_cache; sv_result_cache = 0;
584		428	SvIV_set (sv_result, req->result);
585	res++;	429	SvIOK_only (sv_result);
586
587	while (memofs + len > memlen)
588	{
589	memlen *= 2;
590	names = realloc (names, memlen);
591	if (!names)
592	break;
593	}
594
595	memcpy (names + memofs, name, len);
596	memofs += len;
597	}
598	}
599
600	errorno = errno;
601	closedir (dirp);
602
603	if (errorno)
604	{
605	free (names);
606	errno = errorno;
607	res = -1;
608	}
609
610	*namesp = (void *)names;
611	return res;
612	}
613
614	/*****************************************************************************/
615
616	static void *
617	aio_proc (void *thr_arg)
618	{
619	aio_req req;
620	int type;
621
622	do
623	{
624	pthread_mutex_lock (&reqlock);
625
626	for (;;)
627	{
628	req = reqs;
629
630	if (reqs)
631	{
632	reqs = reqs->next;
633	if (!reqs) reqe = 0;
634	}
635
636	if (req)
637	break;
638
639	pthread_cond_wait (&reqwait, &reqlock);
640	}
641
642	pthread_mutex_unlock (&reqlock);
643
644	errno = 0; /* strictly unnecessary */
645
646	type = req->type;
647
648	switch (type)
649	{
650	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
651	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
652
653	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
654	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
655
656	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
657	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
658	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
659
660	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
661	case REQ_CLOSE: req->result = close (req->fd); break;
662	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
663	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
664	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
665
666	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
667	case REQ_FSYNC: req->result = fsync (req->fd); break;
668	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
669
670	case REQ_QUIT:
671	break;
672
673	default:
674	req->result = ENOSYS;
675	break;
676	}
677
678	req->errorno = errno;
679
680	pthread_mutex_lock (&reslock);
681
682	req->next = 0;
683
684	if (rese)
685	{
686	rese->next = req;
687	rese = req;
688	}	430	}
689	else	431	else
690	{	432	{
691	rese = ress = req;	433	sv_result = newSViv (req->result);
692		434	SvREADONLY_on (sv_result);
693	/* write a dummy byte to the pipe so fh becomes ready */
694	write (respipe [1], &respipe, 1);
695	}	435	}
696		436
697	pthread_mutex_unlock (&reslock);	437	switch (req->type)
		438	{
		439	case EIO_WD_OPEN:
		440	PUSHs (req->result ? &PL_sv_undef : sv_2mortal (newSVaio_wd (req->wd)));
		441	break;
		442
		443	case EIO_READDIR:
		444	{
		445	SV *rv = &PL_sv_undef;
		446
		447	if (req->result >= 0)
		448	{
		449	int i;
		450	char *names = (char *)req->ptr2;
		451	eio_dirent *ent = (eio_dirent *)req->ptr1; /* might be 0 */
		452	AV *av = newAV ();
		453
		454	av_extend (av, req->result - 1);
		455
		456	for (i = 0; i < req->result; ++i)
		457	{
		458	if (req->int1 & EIO_READDIR_DENTS)
		459	{
		460	SV *namesv = newSVpvn (names + ent->nameofs, ent->namelen);
		461
		462	if (req->int1 & EIO_READDIR_CUSTOM2)
		463	{
		464	static SV *sv_type [EIO_DT_MAX + 1]; /* type sv cache */
		465	AV *avent = newAV ();
		466
		467	av_extend (avent, 2);
		468
		469	if (!sv_type [ent->type])
		470	{
		471	sv_type [ent->type] = newSViv (ent->type);
		472	SvREADONLY_on (sv_type [ent->type]);
		473	}
		474
		475	av_store (avent, 0, namesv);
		476	av_store (avent, 1, SvREFCNT_inc (sv_type [ent->type]));
		477	av_store (avent, 2, IVSIZE >= 8 ? newSVuv (ent->inode) : newSVnv (ent->inode));
		478
		479	av_store (av, i, newRV_noinc ((SV *)avent));
		480	}
		481	else
		482	av_store (av, i, namesv);
		483
		484	++ent;
		485	}
		486	else
		487	{
		488	SV *name = newSVpv (names, 0);
		489	av_store (av, i, name);
		490	names += SvCUR (name) + 1;
		491	}
		492	}
		493
		494	rv = sv_2mortal (newRV_noinc ((SV *)av));
		495	}
		496
		497	PUSHs (rv);
		498
		499	if (req->int1 & EIO_READDIR_CUSTOM1)
		500	XPUSHs (sv_2mortal (newSViv (req->int1 & ~(EIO_READDIR_CUSTOM1 | EIO_READDIR_CUSTOM2))));
		501	}
		502	break;
		503
		504	case EIO_OPEN:
		505	PUSHs (newmortalFH (req->result, req->int1 & (O_RDONLY | O_WRONLY | O_RDWR)));
		506	break;
		507
		508	case EIO_STATVFS:
		509	case EIO_FSTATVFS:
		510	{
		511	SV *rv = &PL_sv_undef;
		512
		513	#ifndef _WIN32
		514	if (req->result >= 0)
		515	{
		516	EIO_STRUCT_STATVFS *f = EIO_STATVFS_BUF (req);
		517	HV *hv = newHV ();
		518	/* POSIX requires fsid to be unsigned long, but AIX in its infinite wisdom
		519	* chooses to make it a struct.
		520	*/
		521	unsigned long fsid = 0;
		522	memcpy (&fsid, &f->f_fsid, sizeof (unsigned long) < sizeof (f->f_fsid) ? sizeof (unsigned long) : sizeof (f->f_fsid));
		523
		524	rv = sv_2mortal (newRV_noinc ((SV *)hv));
		525
		526	hv_store (hv, "bsize" , sizeof ("bsize" ) - 1, newSVval64 (f->f_bsize ), 0);
		527	hv_store (hv, "frsize" , sizeof ("frsize" ) - 1, newSVval64 (f->f_frsize ), 0);
		528	hv_store (hv, "blocks" , sizeof ("blocks" ) - 1, newSVval64 (f->f_blocks ), 0);
		529	hv_store (hv, "bfree" , sizeof ("bfree" ) - 1, newSVval64 (f->f_bfree ), 0);
		530	hv_store (hv, "bavail" , sizeof ("bavail" ) - 1, newSVval64 (f->f_bavail ), 0);
		531	hv_store (hv, "files" , sizeof ("files" ) - 1, newSVval64 (f->f_files ), 0);
		532	hv_store (hv, "ffree" , sizeof ("ffree" ) - 1, newSVval64 (f->f_ffree ), 0);
		533	hv_store (hv, "favail" , sizeof ("favail" ) - 1, newSVval64 (f->f_favail ), 0);
		534	hv_store (hv, "fsid" , sizeof ("fsid" ) - 1, newSVval64 (fsid ), 0);
		535	hv_store (hv, "flag" , sizeof ("flag" ) - 1, newSVval64 (f->f_flag ), 0);
		536	hv_store (hv, "namemax", sizeof ("namemax") - 1, newSVval64 (f->f_namemax), 0);
		537	}
		538	#endif
		539
		540	PUSHs (rv);
		541	}
		542
		543	break;
		544
		545	case EIO_GROUP:
		546	req->int1 = 2; /* mark group as finished */
		547
		548	if (req->sv1)
		549	{
		550	int i;
		551	AV *av = (AV *)req->sv1;
		552
		553	EXTEND (SP, AvFILL (av) + 1);
		554	for (i = 0; i <= AvFILL (av); ++i)
		555	PUSHs (*av_fetch (av, i, 0));
		556	}
		557	break;
		558
		559	case EIO_NOP:
		560	case EIO_BUSY:
		561	break;
		562
		563	case EIO_READLINK:
		564	case EIO_REALPATH:
		565	if (req->result > 0)
		566	PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
		567	break;
		568
		569	case EIO_STAT:
		570	case EIO_LSTAT:
		571	case EIO_FSTAT:
		572	PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
		573
		574	if (!(PL_laststatval = req->result))
		575	/* if compilation fails here then perl's Stat_t is not struct _stati64 */
		576	PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
		577
		578	PUSHs (sv_result);
		579	break;
		580
		581	case EIO_SEEK:
		582	PUSHs (req->result ? sv_result : sv_2mortal (newSVval64 (req->offs)));
		583	break;
		584
		585	case EIO_READ:
		586	{
		587	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		588	*SvEND (req->sv2) = 0;
		589	SvPOK_only (req->sv2);
		590	SvSETMAGIC (req->sv2);
		591	PUSHs (sv_result);
		592	}
		593	break;
		594
		595	case EIO_CUSTOM:
		596	if (req->feed == fiemap)
		597	{
		598	#if HAVE_FIEMAP
		599	if (!req->result)
		600	{
		601	struct fiemap *fiemap = (struct fiemap *)req->ptr1;
		602
		603	if (fiemap->fm_extent_count)
		604	{
		605	AV *av = newAV ();
		606	int i;
		607
		608	while (fiemap->fm_mapped_extents)
		609	{
		610	struct fiemap_extent *extent = &fiemap->fm_extents [--fiemap->fm_mapped_extents];
		611	AV *ext_av = newAV ();
		612
		613	av_store (ext_av, 3, newSVuv (extent->fe_flags));
		614	av_store (ext_av, 2, newSVval64 (extent->fe_length));
		615	av_store (ext_av, 1, newSVval64 (extent->fe_physical));
		616	av_store (ext_av, 0, newSVval64 (extent->fe_logical));
		617
		618	av_store (av, fiemap->fm_mapped_extents, newRV_noinc ((SV *)ext_av));
		619	}
		620
		621	PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
		622	}
		623	else
		624	{
		625	SvIV_set (sv_result, fiemap->fm_mapped_extents);
		626	PUSHs (sv_result);
		627	}
		628	}
		629	#endif
		630	}
		631	else
		632	PUSHs (sv_result);
		633	break;
		634
		635	case EIO_DUP2: /* EIO_DUP2 actually means aio_close(), so fudge result value */
		636	if (req->result > 0)
		637	SvIV_set (sv_result, 0);
		638	/* FALLTHROUGH */
		639
		640	default:
		641	PUSHs (sv_result);
		642	break;
		643	}
		644
		645	errno = req->errorno;
		646
		647	PUTBACK;
		648	call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
		649	SPAGAIN;
		650
		651	if (expect_false (SvREFCNT (sv_result) != 1 || sv_result_cache))
		652	SvREFCNT_dec (sv_result);
		653	else
		654	sv_result_cache = sv_result;
		655
		656	FREETMPS;
		657	LEAVE;
		658
		659	PUTBACK;
698	}	660	}
699	while (type != REQ_QUIT);	661
		662	return !!SvTRUE (ERRSV);
		663	}
		664
		665	static void
		666	req_destroy (aio_req req)
		667	{
		668	if (req->self)
		669	{
		670	sv_unmagic (req->self, PERL_MAGIC_ext);
		671	SvREFCNT_dec (req->self);
		672	}
		673
		674	SvREFCNT_dec (req->sv1);
		675	SvREFCNT_dec (req->sv2);
		676	SvREFCNT_dec (req->sv3);
		677	SvREFCNT_dec (req->sv4);
		678	SvREFCNT_dec (req->callback);
		679
		680	free (req);
		681	}
		682
		683	static void
		684	req_cancel_subs (aio_req grp)
		685	{
		686	if (grp->type != EIO_GROUP)
		687	return;
		688
		689	SvREFCNT_dec (grp->sv2);
		690	grp->sv2 = 0;
		691
		692	eio_grp_cancel (grp);
		693	}
		694
		695	static void ecb_cold
		696	create_respipe (void)
		697	{
		698	if (s_epipe_renew (&respipe))
		699	croak ("IO::AIO: unable to initialize result pipe");
		700	}
		701
		702	static void
		703	poll_wait (void)
		704	{
		705	while (eio_nreqs ())
		706	{
		707	int size;
		708
		709	X_LOCK (EIO_POOL->reslock);
		710	size = EIO_POOL->res_queue.size;
		711	X_UNLOCK (EIO_POOL->reslock);
		712
		713	if (size)
		714	return;
		715
		716	etp_maybe_start_thread (EIO_POOL);
		717
		718	s_epipe_wait (&respipe);
		719	}
		720	}
		721
		722	static int
		723	poll_cb (void)
		724	{
		725	for (;;)
		726	{
		727	int res = eio_poll ();
		728
		729	if (res > 0)
		730	croak (0);
		731
		732	if (!max_outstanding || max_outstanding > eio_nreqs ())
		733	return res;
		734
		735	poll_wait ();
		736	}
		737	}
		738
		739	static void ecb_cold
		740	reinit (void)
		741	{
		742	create_respipe ();
		743
		744	if (eio_init (want_poll, done_poll) < 0)
		745	croak ("IO::AIO: unable to initialise eio library");
		746	}
		747
		748	/*****************************************************************************/
		749
		750	#if !_POSIX_MAPPED_FILES
		751	# define mmap(addr,length,prot,flags,fd,offs) EIO_ENOSYS ()
		752	# define munmap(addr,length) EIO_ENOSYS ()
		753	#endif
		754
		755	#if !_POSIX_MEMORY_PROTECTION
		756	# define mprotect(addr,len,prot) EIO_ENOSYS ()
		757	#endif
		758
		759	#define MMAP_MAGIC PERL_MAGIC_ext
		760
		761	static int ecb_cold
		762	mmap_free (pTHX_ SV *sv, MAGIC *mg)
		763	{
		764	int old_errno = errno;
		765	munmap (mg->mg_ptr, (size_t)mg->mg_obj);
		766	errno = old_errno;
		767
		768	mg->mg_obj = 0; /* just in case */
		769
		770	SvREADONLY_off (sv);
		771
		772	if (SvPVX (sv) != mg->mg_ptr)
		773	croak ("ERROR: IO::AIO::mmap-mapped scalar changed location, detected");
		774
		775	SvCUR_set (sv, 0);
		776	SvPVX (sv) = 0;
		777	SvOK_off (sv);
700		778
701	return 0;	779	return 0;
702	}	780	}
703		781
		782	static MGVTBL mmap_vtbl = {
		783	0, 0, 0, 0, mmap_free
		784	};
		785
704	/*****************************************************************************/	786	/*****************************************************************************/
705		787
706	static void atfork_prepare (void)	788	static SV *
		789	get_cb (SV *cb_sv)
707	{	790	{
708	pthread_mutex_lock (&reqlock);	791	SvGETMAGIC (cb_sv);
709	pthread_mutex_lock (&reslock);	792	return SvOK (cb_sv) ? s_get_cv_croak (cb_sv) : 0;
710	#if !HAVE_PREADWRITE
711	pthread_mutex_lock (&preadwritelock);
712	#endif
713	#if !HAVE_READDIR_R
714	pthread_mutex_lock (&readdirlock);
715	#endif
716	}	793	}
717		794
718	static void atfork_parent (void)	795	static aio_req ecb_noinline
		796	dreq (SV *callback)
719	{	797	{
720	#if !HAVE_READDIR_R	798	SV *cb_cv;
721	pthread_mutex_unlock (&readdirlock);
722	#endif
723	#if !HAVE_PREADWRITE
724	pthread_mutex_unlock (&preadwritelock);
725	#endif
726	pthread_mutex_unlock (&reslock);
727	pthread_mutex_unlock (&reqlock);
728	}
729
730	static void atfork_child (void)
731	{
732	aio_req prv;	799	aio_req req;
		800	int req_pri = next_pri;
		801	next_pri = EIO_PRI_DEFAULT;
733		802
734	started = 0;	803	cb_cv = get_cb (callback);
735		804
736	while (reqs)	805	req = calloc (sizeof (*req), 1);
		806	if (!req)
		807	croak ("out of memory during eio_req allocation");
		808
		809	req->callback = SvREFCNT_inc (cb_cv);
		810	req->pri = req_pri;
		811
		812	return req;
		813	}
		814
		815	#define dREQ \
		816	aio_req req = dreq (callback); \
		817
		818	#define REQ_SEND \
		819	PUTBACK; \
		820	req_submit (req); \
		821	SPAGAIN; \
		822	\
		823	if (GIMME_V != G_VOID) \
		824	XPUSHs (req_sv (req, aio_req_stash));
		825
		826	ecb_inline void
		827	req_set_path (aio_req req, SV *path, SV **wdsv, SV **pathsv, eio_wd *wd, void **ptr)
		828	{
		829	if (expect_false (SvROK (path)))
737	{	830	{
738	prv = reqs;	831	SV *rv = SvRV (path);
739	reqs = prv->next;	832	SV *wdob;
740	free_req (prv);	833
		834	if (SvTYPE (rv) == SVt_PVAV && AvFILLp (rv) == 1)
		835	{
		836	path = AvARRAY (rv)[1];
		837	wdob = AvARRAY (rv)[0];
		838
		839	if (SvOK (wdob))
		840	{
		841	*wd = SvAIO_WD (wdob);
		842	*wdsv = SvREFCNT_inc_NN (SvRV (wdob));
		843	}
		844	else
		845	*wd = EIO_INVALID_WD;
		846	}
		847	else if (SvTYPE (rv) == SVt_PVMG && SvSTASH (rv) == aio_wd_stash)
		848	{
		849	*wd = (aio_wd)(long)SvIVX (rv);
		850	*wdsv = SvREFCNT_inc_NN (rv);
		851	*ptr = ".";
		852	return; /* path set to "." */
		853	}
		854	else
		855	croak ("IO::AIO: pathname arguments must be specified as a string, an IO::AIO::WD object or a [IO::AIO::WD, path] pair");
741	}	856	}
742		857
743	reqs = reqe = 0;	858	*pathsv = newSVsv (path);
744		859	*ptr = SvPVbyte_nolen (*pathsv);
745	while (ress)	860	}
		861
		862	static void ecb_noinline
		863	req_set_path1 (aio_req req, SV *path)
		864	{
		865	req_set_path (req, path, &req->sv1, &req->sv3, &req->wd, &req->ptr1);
		866	}
		867
		868	static void ecb_noinline
		869	req_set_fh_or_path (aio_req req, int type_path, int type_fh, SV *fh_or_path)
		870	{
		871	SV *rv = SvROK (fh_or_path) ? SvRV (fh_or_path) : fh_or_path;
		872
		873	switch (SvTYPE (rv))
746	{	874	{
747	prv = ress;	875	case SVt_PVIO:
748	ress = prv->next;	876	case SVt_PVLV:
749	free_req (prv);	877	case SVt_PVGV:
		878	req->type = type_fh;
		879	req->sv1 = newSVsv (fh_or_path);
		880	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		881	break;
		882
		883	default:
		884	req->type = type_path;
		885	req_set_path1 (req, fh_or_path);
		886	break;
750	}	887	}
751
752	ress = rese = 0;
753
754	close (respipe [0]);
755	close (respipe [1]);
756	create_pipe ();
757
758	atfork_parent ();
759	}	888	}
760		889
761	#define dREQ \	890	XS(boot_IO__AIO) ecb_cold;
762	aio_req req; \	891
763	\
764	if (SvOK (callback) && !SvROK (callback)) \
765	croak ("clalback must be undef or of reference type"); \
766	\
767	Newz (0, req, 1, aio_cb); \
768	if (!req) \
769	croak ("out of memory during aio_req allocation"); \
770	\
771	req->callback = newSVsv (callback);
772
773	MODULE = IO::AIO PACKAGE = IO::AIO	892	MODULE = IO::AIO PACKAGE = IO::AIO
774		893
775	PROTOTYPES: ENABLE	894	PROTOTYPES: ENABLE
776		895
777	BOOT:	896	BOOT:
778	{	897	{
779	create_pipe ();	898	static const struct {
780	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	899	const char *name;
781	}	900	IV iv;
		901	} *civ, const_iv[] = {
		902	# define const_niv(name, value) { # name, (IV) value },
		903	# define const_iv(name) { # name, (IV) name },
		904	# define const_eio(name) { # name, (IV) EIO_ ## name },
782		905
		906	/* you have to re-run ./gendef0 after adding/removing any constants here */
		907	/* the first block can be undef if missing */
		908	const_iv (ENOSYS)
		909	const_iv (EXDEV)
		910	const_iv (EBADR)
		911
		912	/* for lseek */
		913	const_iv (SEEK_DATA)
		914	const_iv (SEEK_HOLE)
		915
		916	const_niv (FADV_NORMAL , POSIX_FADV_NORMAL)
		917	const_niv (FADV_SEQUENTIAL, POSIX_FADV_SEQUENTIAL)
		918	const_niv (FADV_RANDOM , POSIX_FADV_RANDOM)
		919	const_niv (FADV_NOREUSE , POSIX_FADV_NOREUSE)
		920	const_niv (FADV_WILLNEED , POSIX_FADV_WILLNEED)
		921	const_niv (FADV_DONTNEED , POSIX_FADV_DONTNEED)
		922
		923	const_niv (MADV_NORMAL , POSIX_MADV_NORMAL)
		924	const_niv (MADV_SEQUENTIAL, POSIX_MADV_SEQUENTIAL)
		925	const_niv (MADV_RANDOM , POSIX_MADV_RANDOM)
		926	const_niv (MADV_WILLNEED , POSIX_MADV_WILLNEED)
		927	const_niv (MADV_DONTNEED , POSIX_MADV_DONTNEED)
		928
		929	/* the second block will be 0 when missing */
		930	const_iv (O_RDONLY)
		931	const_iv (O_WRONLY)
		932	const_iv (O_RDWR)
		933	const_iv (O_CREAT)
		934	const_iv (O_TRUNC)
		935	const_iv (O_EXCL)
		936	const_iv (O_APPEND)
		937
		938	const_iv (O_ASYNC)
		939	const_iv (O_DIRECT)
		940	const_iv (O_NOATIME)
		941
		942	const_iv (O_CLOEXEC)
		943	const_iv (O_NOCTTY)
		944	const_iv (O_NOFOLLOW)
		945	const_iv (O_NONBLOCK)
		946	const_iv (O_EXEC)
		947	const_iv (O_SEARCH)
		948	const_iv (O_DIRECTORY)
		949	const_iv (O_DSYNC)
		950	const_iv (O_RSYNC)
		951	const_iv (O_SYNC)
		952	const_iv (O_PATH)
		953	const_iv (O_TMPFILE)
		954	const_iv (O_TTY_INIT)
		955
		956	const_iv (S_IFIFO)
		957	const_iv (S_IFCHR)
		958	const_iv (S_IFBLK)
		959	const_iv (S_IFLNK)
		960	const_iv (S_IFREG)
		961	const_iv (S_IFDIR)
		962	const_iv (S_IFWHT)
		963	const_iv (S_IFSOCK)
		964	const_iv (S_IFMT)
		965
		966	const_iv (ST_RDONLY)
		967	const_iv (ST_NOSUID)
		968	const_iv (ST_NODEV)
		969	const_iv (ST_NOEXEC)
		970	const_iv (ST_SYNCHRONOUS)
		971	const_iv (ST_MANDLOCK)
		972	const_iv (ST_WRITE)
		973	const_iv (ST_APPEND)
		974	const_iv (ST_IMMUTABLE)
		975	const_iv (ST_NOATIME)
		976	const_iv (ST_NODIRATIME)
		977	const_iv (ST_RELATIME)
		978
		979	const_iv (PROT_NONE)
		980	const_iv (PROT_EXEC)
		981	const_iv (PROT_READ)
		982	const_iv (PROT_WRITE)
		983
		984	const_iv (MAP_PRIVATE)
		985	const_iv (MAP_SHARED)
		986	const_iv (MAP_FIXED)
		987	const_iv (MAP_ANONYMOUS)
		988
		989	/* linuxish */
		990	const_iv (MAP_LOCKED)
		991	const_iv (MAP_NORESERVE)
		992	const_iv (MAP_POPULATE)
		993	const_iv (MAP_NONBLOCK)
		994	const_iv (MAP_GROWSDOWN)
		995	const_iv (MAP_32BIT)
		996	const_iv (MAP_HUGETLB)
		997	const_iv (MAP_STACK)
		998
		999	const_iv (FIEMAP_FLAG_SYNC)
		1000	const_iv (FIEMAP_FLAG_XATTR)
		1001	const_iv (FIEMAP_FLAGS_COMPAT)
		1002	const_iv (FIEMAP_EXTENT_LAST)
		1003	const_iv (FIEMAP_EXTENT_UNKNOWN)
		1004	const_iv (FIEMAP_EXTENT_DELALLOC)
		1005	const_iv (FIEMAP_EXTENT_ENCODED)
		1006	const_iv (FIEMAP_EXTENT_DATA_ENCRYPTED)
		1007	const_iv (FIEMAP_EXTENT_NOT_ALIGNED)
		1008	const_iv (FIEMAP_EXTENT_DATA_INLINE)
		1009	const_iv (FIEMAP_EXTENT_DATA_TAIL)
		1010	const_iv (FIEMAP_EXTENT_UNWRITTEN)
		1011	const_iv (FIEMAP_EXTENT_MERGED)
		1012	const_iv (FIEMAP_EXTENT_SHARED)
		1013
		1014	const_iv (SPLICE_F_MOVE)
		1015	const_iv (SPLICE_F_NONBLOCK)
		1016	const_iv (SPLICE_F_MORE)
		1017	const_iv (SPLICE_F_GIFT)
		1018
		1019	/* these are libeio constants, and are independent of gendef0 */
		1020	const_eio (SEEK_SET)
		1021	const_eio (SEEK_CUR)
		1022	const_eio (SEEK_END)
		1023
		1024	const_eio (MCL_FUTURE)
		1025	const_eio (MCL_CURRENT)
		1026
		1027	const_eio (MS_ASYNC)
		1028	const_eio (MS_INVALIDATE)
		1029	const_eio (MS_SYNC)
		1030
		1031	const_eio (MT_MODIFY)
		1032
		1033	const_eio (SYNC_FILE_RANGE_WAIT_BEFORE)
		1034	const_eio (SYNC_FILE_RANGE_WRITE)
		1035	const_eio (SYNC_FILE_RANGE_WAIT_AFTER)
		1036
		1037	const_eio (FALLOC_FL_KEEP_SIZE)
		1038	const_eio (FALLOC_FL_PUNCH_HOLE)
		1039	const_eio (FALLOC_FL_COLLAPSE_RANGE)
		1040	const_eio (FALLOC_FL_ZERO_RANGE)
		1041
		1042	const_eio (READDIR_DENTS)
		1043	const_eio (READDIR_DIRS_FIRST)
		1044	const_eio (READDIR_STAT_ORDER)
		1045	const_eio (READDIR_FOUND_UNKNOWN)
		1046
		1047	const_eio (DT_UNKNOWN)
		1048	const_eio (DT_FIFO)
		1049	const_eio (DT_CHR)
		1050	const_eio (DT_DIR)
		1051	const_eio (DT_BLK)
		1052	const_eio (DT_REG)
		1053	const_eio (DT_LNK)
		1054	const_eio (DT_SOCK)
		1055	const_eio (DT_WHT)
		1056	};
		1057
		1058	aio_stash = gv_stashpv ("IO::AIO" , 1);
		1059	aio_req_stash = gv_stashpv ("IO::AIO::REQ", 1);
		1060	aio_grp_stash = gv_stashpv ("IO::AIO::GRP", 1);
		1061	aio_wd_stash = gv_stashpv ("IO::AIO::WD" , 1);
		1062
		1063	for (civ = const_iv + sizeof (const_iv) / sizeof (const_iv [0]); civ > const_iv; civ--)
		1064	newCONSTSUB (aio_stash, (char *)civ[-1].name, newSViv (civ[-1].iv));
		1065
		1066	newCONSTSUB (aio_stash, "PAGESIZE", newSViv (PAGESIZE));
		1067
		1068	reinit ();
		1069	}
		1070
783	void	1071	void
784	min_parallel(nthreads)	1072	reinit ()
785	int nthreads	1073	PROTOTYPE:
		1074
		1075	void
		1076	max_poll_reqs (unsigned int nreqs)
786	PROTOTYPE: $	1077	PROTOTYPE: $
		1078	CODE:
		1079	eio_set_max_poll_reqs (nreqs);
787		1080
788	void	1081	void
789	max_parallel(nthreads)	1082	max_poll_time (double nseconds)
790	int nthreads
791	PROTOTYPE: $	1083	PROTOTYPE: $
792
793	int
794	max_outstanding(nreqs)
795	int nreqs
796	PROTOTYPE: $
797	CODE:	1084	CODE:
798	RETVAL = max_outstanding;	1085	eio_set_max_poll_time (nseconds);
		1086
		1087	void
		1088	min_parallel (unsigned int nthreads)
		1089	PROTOTYPE: $
		1090	CODE:
		1091	eio_set_min_parallel (nthreads);
		1092
		1093	void
		1094	max_parallel (unsigned int nthreads)
		1095	PROTOTYPE: $
		1096	CODE:
		1097	eio_set_max_parallel (nthreads);
		1098
		1099	void
		1100	max_idle (unsigned int nthreads)
		1101	PROTOTYPE: $
		1102	CODE:
		1103	eio_set_max_idle (nthreads);
		1104
		1105	void
		1106	idle_timeout (unsigned int seconds)
		1107	PROTOTYPE: $
		1108	CODE:
		1109	eio_set_idle_timeout (seconds);
		1110
		1111	void
		1112	max_outstanding (unsigned int maxreqs)
		1113	PROTOTYPE: $
		1114	CODE:
799	max_outstanding = nreqs;	1115	max_outstanding = maxreqs;
800		1116
801	void	1117	void
802	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1118	aio_wd (SV8 *pathname, SV *callback = &PL_sv_undef)
803	SV * pathname
804	int flags
805	int mode
806	SV * callback
807	PROTOTYPE: $$$;$
808	CODE:	1119	PPCODE:
809	{	1120	{
810	dREQ;	1121	dREQ;
811		1122
		1123	req->type = EIO_WD_OPEN;
		1124	req_set_path1 (req, pathname);
		1125
		1126	REQ_SEND;
		1127	}
		1128
		1129	void
		1130	aio_open (SV8 *pathname, int flags, int mode, SV *callback = &PL_sv_undef)
		1131	PPCODE:
		1132	{
		1133	dREQ;
		1134
812	req->type = REQ_OPEN;	1135	req->type = EIO_OPEN;
813	req->data = newSVsv (pathname);	1136	req_set_path1 (req, pathname);
814	req->dataptr = SvPVbyte_nolen (req->data);
815	req->fd = flags;	1137	req->int1 = flags;
816	req->mode = mode;	1138	req->int2 = mode;
817		1139
818	send_req (req);	1140	REQ_SEND;
819	}	1141	}
820		1142
821	void	1143	void
822	aio_close(fh,callback=&PL_sv_undef)	1144	aio_fsync (SV *fh, SV *callback = &PL_sv_undef)
823	SV * fh
824	SV * callback
825	PROTOTYPE: $;$
826	ALIAS:	1145	ALIAS:
827	aio_close = REQ_CLOSE
828	aio_fsync = REQ_FSYNC	1146	aio_fsync = EIO_FSYNC
829	aio_fdatasync = REQ_FDATASYNC	1147	aio_fdatasync = EIO_FDATASYNC
		1148	aio_syncfs = EIO_SYNCFS
830	CODE:	1149	PPCODE:
831	{	1150	{
		1151	int fd = s_fileno_croak (fh, 0);
832	dREQ;	1152	dREQ;
833		1153
834	req->type = ix;	1154	req->type = ix;
835	req->fh = newSVsv (fh);	1155	req->sv1 = newSVsv (fh);
836	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1156	req->int1 = fd;
837		1157
838	send_req (req);	1158	REQ_SEND;
839	}	1159	}
840		1160
841	void	1161	void
		1162	aio_sync_file_range (SV *fh, off_t offset, size_t nbytes, UV flags, SV *callback = &PL_sv_undef)
		1163	PPCODE:
		1164	{
		1165	int fd = s_fileno_croak (fh, 0);
		1166	dREQ;
		1167
		1168	req->type = EIO_SYNC_FILE_RANGE;
		1169	req->sv1 = newSVsv (fh);
		1170	req->int1 = fd;
		1171	req->offs = offset;
		1172	req->size = nbytes;
		1173	req->int2 = flags;
		1174
		1175	REQ_SEND;
		1176	}
		1177
		1178	void
		1179	aio_allocate (SV *fh, int mode, off_t offset, size_t len, SV *callback = &PL_sv_undef)
		1180	PPCODE:
		1181	{
		1182	int fd = s_fileno_croak (fh, 0);
		1183	dREQ;
		1184
		1185	req->type = EIO_FALLOCATE;
		1186	req->sv1 = newSVsv (fh);
		1187	req->int1 = fd;
		1188	req->int2 = mode;
		1189	req->offs = offset;
		1190	req->size = len;
		1191
		1192	REQ_SEND;
		1193	}
		1194
		1195	void
		1196	aio_close (SV *fh, SV *callback = &PL_sv_undef)
		1197	PPCODE:
		1198	{
		1199	static int close_fd = -1; /* dummy fd to close fds via dup2 */
		1200	int fd = s_fileno_croak (fh, 0);
		1201	dREQ;
		1202
		1203	if (expect_false (close_fd < 0))
		1204	{
		1205	int pipefd [2];
		1206
		1207	if (
		1208	#ifdef _WIN32
		1209	_pipe (pipefd, 1, _O_BINARY) < 0
		1210	#else
		1211	pipe (pipefd) < 0
		1212	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0
		1213	#endif
		1214	|| close (pipefd [1]) < 0
		1215	)
		1216	abort (); /*D*/
		1217
		1218	close_fd = pipefd [0];
		1219	}
		1220
		1221	req->type = EIO_DUP2;
		1222	req->int1 = close_fd;
		1223	req->sv2 = newSVsv (fh);
		1224	req->int2 = fd;
		1225
		1226	REQ_SEND;
		1227	}
		1228
		1229	void
		1230	aio_seek (SV *fh, SV *offset, int whence, SV *callback = &PL_sv_undef)
		1231	PPCODE:
		1232	{
		1233	int fd = s_fileno_croak (fh, 0);
		1234	dREQ;
		1235
		1236	req->type = EIO_SEEK;
		1237	req->sv1 = newSVsv (fh);
		1238	req->int1 = fd;
		1239	req->offs = SvVAL64 (offset);
		1240	req->int2 = whence;
		1241
		1242	REQ_SEND;
		1243	}
		1244
		1245	void
842	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1246	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback = &PL_sv_undef)
843	SV * fh
844	UV offset
845	UV length
846	SV * data
847	UV dataoffset
848	SV * callback
849	ALIAS:	1247	ALIAS:
850	aio_read = REQ_READ	1248	aio_read = EIO_READ
851	aio_write = REQ_WRITE	1249	aio_write = EIO_WRITE
852	PROTOTYPE: $$$$$;$
853	CODE:	1250	PPCODE:
854	{	1251	{
855	aio_req req;
856	STRLEN svlen;	1252	STRLEN svlen;
		1253	int fd = s_fileno_croak (fh, ix == EIO_WRITE);
857	char *svptr = SvPVbyte (data, svlen);	1254	char *svptr = SvPVbyte (data, svlen);
858		1255	UV len = SvUV (length);
859	SvUPGRADE (data, SVt_PV);
860	SvPOK_on (data);
861		1256
862	if (dataoffset < 0)	1257	if (dataoffset < 0)
863	dataoffset += svlen;	1258	dataoffset += svlen;
864		1259
865	if (dataoffset < 0 || dataoffset > svlen)	1260	if (dataoffset < 0 || dataoffset > svlen)
866	croak ("data offset outside of string");	1261	croak ("dataoffset outside of data scalar");
867		1262
868	if (ix == REQ_WRITE)	1263	if (ix == EIO_WRITE)
869	{	1264	{
870	/* write: check length and adjust. */	1265	/* write: check length and adjust. */
871	if (length < 0 || length + dataoffset > svlen)	1266	if (!SvOK (length) || len + dataoffset > svlen)
872	length = svlen - dataoffset;	1267	len = svlen - dataoffset;
873	}	1268	}
874	else	1269	else
875	{	1270	{
876	/* read: grow scalar as necessary */	1271	/* read: check type and grow scalar as necessary */
		1272	if (!SvPOK (data) || SvLEN (data) >= SvCUR (data))
877	svptr = SvGROW (data, length + dataoffset);	1273	svptr = sv_grow (data, len + dataoffset + 1);
		1274	else if (SvCUR (data) < len + dataoffset)
		1275	croak ("length + dataoffset outside of scalar, and cannot grow");
878	}	1276	}
879
880	if (length < 0)
881	croak ("length must not be negative");
882		1277
883	{	1278	{
884	dREQ;	1279	dREQ;
885		1280
886	req->type = ix;	1281	req->type = ix;
887	req->fh = newSVsv (fh);	1282	req->sv1 = newSVsv (fh);
888	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1283	req->int1 = fd;
889	: IoOFP (sv_2io (fh)));	1284	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
890	req->offset = offset;	1285	req->size = len;
891	req->length = length;
892	req->data = SvREFCNT_inc (data);	1286	req->sv2 = SvREFCNT_inc (data);
893	req->dataptr = (char *)svptr + dataoffset;	1287	req->ptr2 = (char *)svptr + dataoffset;
		1288	req->stroffset = dataoffset;
894		1289
895	if (!SvREADONLY (data))	1290	if (!SvREADONLY (data))
896	{	1291	{
897	SvREADONLY_on (data);	1292	SvREADONLY_on (data);
898	req->data2ptr = (void *)data;	1293	req->flags |= FLAG_SV2_RO_OFF;
899	}	1294	}
900		1295
901	send_req (req);	1296	REQ_SEND;
902	}	1297	}
903	}	1298	}
904		1299
905	void	1300	void
906	aio_sendfile(out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	1301	aio_ioctl (SV *fh, unsigned long request, SV8 *arg, SV *callback = &PL_sv_undef)
907	SV * out_fh
908	SV * in_fh
909	UV in_offset
910	UV length
911	SV * callback
912	PROTOTYPE: $$$$;$
913	CODE:
914	{
915	dREQ;
916
917	req->type = REQ_SENDFILE;
918	req->fh = newSVsv (out_fh);
919	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
920	req->fh2 = newSVsv (in_fh);
921	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
922	req->offset = in_offset;
923	req->length = length;
924
925	send_req (req);
926	}
927
928	void
929	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
930	SV * fh
931	UV offset
932	IV length
933	SV * callback
934	PROTOTYPE: $$$;$
935	CODE:
936	{
937	dREQ;
938
939	req->type = REQ_READAHEAD;
940	req->fh = newSVsv (fh);
941	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
942	req->offset = offset;
943	req->length = length;
944
945	send_req (req);
946	}
947
948	void
949	aio_stat(fh_or_path,callback=&PL_sv_undef)
950	SV * fh_or_path
951	SV * callback
952	ALIAS:	1302	ALIAS:
953	aio_stat = REQ_STAT	1303	aio_ioctl = EIO_IOCTL
954	aio_lstat = REQ_LSTAT	1304	aio_fcntl = EIO_FCNTL
955	CODE:	1305	PPCODE:
956	{	1306	{
957	dREQ;	1307	int fd = s_fileno_croak (fh, 0);
		1308	char *svptr;
958		1309
959	New (0, req->statdata, 1, Stat_t);	1310	if (SvPOK (arg) || !SvNIOK (arg))
960	if (!req->statdata)
961	{	1311	{
962	free_req (req);	1312	STRLEN svlen;
963	croak ("out of memory during aio_req->statdata allocation");	1313	/* perl uses IOCPARM_LEN for fcntl, so we do, too */
964	}	1314	#ifdef IOCPARM_LEN
		1315	STRLEN need = IOCPARM_LEN (request);
		1316	#else
		1317	STRLEN need = 256;
		1318	#endif
965		1319
966	if (SvPOK (fh_or_path))	1320	if (svlen < need)
967	{	1321	svptr = SvGROW (arg, need + 1);
968	req->type = ix;
969	req->data = newSVsv (fh_or_path);
970	req->dataptr = SvPVbyte_nolen (req->data);
971	}	1322	}
972	else	1323	else
		1324	svptr = (char *)SvIV (arg);
		1325
973	{	1326	{
		1327	dREQ;
		1328
974	req->type = REQ_FSTAT;	1329	req->type = ix;
975	req->fh = newSVsv (fh_or_path);	1330	req->sv1 = newSVsv (fh);
976	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1331	req->int1 = fd;
		1332	req->int2 = (long)request;
		1333	req->sv2 = SvREFCNT_inc (arg);
		1334	req->ptr2 = svptr;
		1335
		1336	REQ_SEND;
977	}	1337	}
978
979	send_req (req);
980	}	1338	}
981		1339
982	void	1340	void
983	aio_unlink(pathname,callback=&PL_sv_undef)	1341	aio_readlink (SV8 *pathname, SV *callback = &PL_sv_undef)
984	SV * pathname
985	SV * callback
986	ALIAS:	1342	ALIAS:
987	aio_unlink = REQ_UNLINK	1343	aio_readlink = EIO_READLINK
988	aio_rmdir = REQ_RMDIR	1344	aio_realpath = EIO_REALPATH
		1345	PPCODE:
		1346	{
		1347	dREQ;
		1348
		1349	req->type = ix;
		1350	req_set_path1 (req, pathname);
		1351
		1352	REQ_SEND;
		1353	}
		1354
		1355	void
		1356	aio_sendfile (SV *out_fh, SV *in_fh, off_t in_offset, size_t length, SV *callback = &PL_sv_undef)
		1357	PPCODE:
		1358	{
		1359	int ifd = s_fileno_croak (in_fh , 0);
		1360	int ofd = s_fileno_croak (out_fh, 1);
		1361	dREQ;
		1362
		1363	req->type = EIO_SENDFILE;
		1364	req->sv1 = newSVsv (out_fh);
		1365	req->int1 = ofd;
		1366	req->sv2 = newSVsv (in_fh);
		1367	req->int2 = ifd;
		1368	req->offs = in_offset;
		1369	req->size = length;
		1370
		1371	REQ_SEND;
		1372	}
		1373
		1374	void
		1375	aio_readahead (SV *fh, off_t offset, size_t length, SV *callback = &PL_sv_undef)
		1376	PPCODE:
		1377	{
		1378	int fd = s_fileno_croak (fh, 0);
		1379	dREQ;
		1380
		1381	req->type = EIO_READAHEAD;
		1382	req->sv1 = newSVsv (fh);
		1383	req->int1 = fd;
		1384	req->offs = offset;
		1385	req->size = length;
		1386
		1387	REQ_SEND;
		1388	}
		1389
		1390	void
		1391	aio_stat (SV8 *fh_or_path, SV *callback = &PL_sv_undef)
		1392	ALIAS:
		1393	aio_stat = EIO_STAT
		1394	aio_lstat = EIO_LSTAT
		1395	aio_statvfs = EIO_STATVFS
		1396	PPCODE:
		1397	{
		1398	dREQ;
		1399
		1400	req_set_fh_or_path (req, ix, ix == EIO_STATVFS ? EIO_FSTATVFS : EIO_FSTAT, fh_or_path);
		1401
		1402	REQ_SEND;
		1403	}
		1404
		1405	UV
		1406	major (UV dev)
		1407	ALIAS:
		1408	minor = 1
989	CODE:	1409	CODE:
		1410	RETVAL = ix ? major (dev) : minor (dev);
		1411	OUTPUT:
		1412	RETVAL
		1413
		1414	UV
		1415	makedev (UV maj, UV min)
		1416	CODE:
		1417	RETVAL = makedev (maj, min);
		1418	OUTPUT:
		1419	RETVAL
		1420
		1421	void
		1422	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback = &PL_sv_undef)
		1423	PPCODE:
		1424	{
		1425	dREQ;
		1426
		1427	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		1428	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		1429	req_set_fh_or_path (req, EIO_UTIME, EIO_FUTIME, fh_or_path);
		1430
		1431	REQ_SEND;
		1432	}
		1433
		1434	void
		1435	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback = &PL_sv_undef)
		1436	PPCODE:
		1437	{
		1438	dREQ;
		1439
		1440	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		1441	req_set_fh_or_path (req, EIO_TRUNCATE, EIO_FTRUNCATE, fh_or_path);
		1442
		1443	REQ_SEND;
		1444	}
		1445
		1446	void
		1447	aio_chmod (SV8 *fh_or_path, int mode, SV *callback = &PL_sv_undef)
		1448	PPCODE:
		1449	{
		1450	dREQ;
		1451
		1452	req->int2 = mode;
		1453	req_set_fh_or_path (req, EIO_CHMOD, EIO_FCHMOD, fh_or_path);
		1454
		1455	REQ_SEND;
		1456	}
		1457
		1458	void
		1459	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback = &PL_sv_undef)
		1460	PPCODE:
		1461	{
		1462	dREQ;
		1463
		1464	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		1465	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		1466	req_set_fh_or_path (req, EIO_CHOWN, EIO_FCHOWN, fh_or_path);
		1467
		1468	REQ_SEND;
		1469	}
		1470
		1471	void
		1472	aio_readdirx (SV8 *pathname, IV flags, SV *callback = &PL_sv_undef)
		1473	PPCODE:
		1474	{
		1475	dREQ;
		1476
		1477	req->type = EIO_READDIR;
		1478	req->int1 = flags | EIO_READDIR_DENTS | EIO_READDIR_CUSTOM1;
		1479
		1480	if (flags & EIO_READDIR_DENTS)
		1481	req->int1 |= EIO_READDIR_CUSTOM2;
		1482
		1483	req_set_path1 (req, pathname);
		1484
		1485	REQ_SEND;
		1486	}
		1487
		1488	void
		1489	aio_mkdir (SV8 *pathname, int mode, SV *callback = &PL_sv_undef)
		1490	PPCODE:
		1491	{
		1492	dREQ;
		1493
		1494	req->type = EIO_MKDIR;
		1495	req->int2 = mode;
		1496	req_set_path1 (req, pathname);
		1497
		1498	REQ_SEND;
		1499	}
		1500
		1501	void
		1502	aio_unlink (SV8 *pathname, SV *callback = &PL_sv_undef)
		1503	ALIAS:
		1504	aio_unlink = EIO_UNLINK
		1505	aio_rmdir = EIO_RMDIR
		1506	aio_readdir = EIO_READDIR
		1507	PPCODE:
990	{	1508	{
991	dREQ;	1509	dREQ;
992		1510
993	req->type = ix;	1511	req->type = ix;
994	req->data = newSVsv (pathname);	1512	req_set_path1 (req, pathname);
995	req->dataptr = SvPVbyte_nolen (req->data);
996
997	send_req (req);
998	}
999		1513
		1514	REQ_SEND;
		1515	}
		1516
1000	void	1517	void
1001	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1518	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback = &PL_sv_undef)
1002	SV * oldpath	1519	ALIAS:
1003	SV * newpath	1520	aio_link = EIO_LINK
1004	SV * callback	1521	aio_symlink = EIO_SYMLINK
		1522	aio_rename = EIO_RENAME
1005	CODE:	1523	PPCODE:
1006	{	1524	{
		1525	eio_wd wd2 = 0;
1007	dREQ;	1526	dREQ;
1008		1527
1009	req->type = REQ_SYMLINK;	1528	req->type = ix;
1010	req->fh = newSVsv (oldpath);	1529	req_set_path1 (req, oldpath);
1011	req->data2ptr = SvPVbyte_nolen (req->fh);	1530	req_set_path (req, newpath, &req->sv2, &req->sv4, &wd2, &req->ptr2);
1012	req->data = newSVsv (newpath);	1531	req->int3 = (long)wd2;
1013	req->dataptr = SvPVbyte_nolen (req->data);
1014		1532
1015	send_req (req);	1533	REQ_SEND;
1016	}	1534	}
1017		1535
1018	void	1536	void
1019	aio_readdir(pathname,callback=&PL_sv_undef)	1537	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback = &PL_sv_undef)
1020	SV * pathname
1021	SV * callback
1022	CODE:	1538	PPCODE:
1023	{	1539	{
1024	dREQ;	1540	dREQ;
1025		1541
1026	req->type = REQ_READDIR;	1542	req->type = EIO_MKNOD;
1027	req->data = newSVsv (pathname);	1543	req->int2 = (mode_t)mode;
1028	req->dataptr = SvPVbyte_nolen (req->data);	1544	req->offs = dev;
		1545	req_set_path1 (req, pathname);
1029		1546
1030	send_req (req);	1547	REQ_SEND;
1031	}	1548	}
1032		1549
1033	void	1550	void
1034	flush()	1551	aio_mtouch (SV8 *data, IV offset = 0, SV *length = &PL_sv_undef, int flags = 0, SV *callback = &PL_sv_undef)
1035	PROTOTYPE:	1552	ALIAS:
		1553	aio_mtouch = EIO_MTOUCH
		1554	aio_msync = EIO_MSYNC
		1555	PPCODE:
		1556	{
		1557	STRLEN svlen;
		1558	char *svptr = SvPVbyte (data, svlen);
		1559	UV len = SvUV (length);
		1560
		1561	if (offset < 0)
		1562	offset += svlen;
		1563
		1564	if (offset < 0 || offset > svlen)
		1565	croak ("offset outside of scalar");
		1566
		1567	if (!SvOK (length) || len + offset > svlen)
		1568	len = svlen - offset;
		1569
		1570	{
		1571	dREQ;
		1572
		1573	req->type = ix;
		1574	req->sv2 = SvREFCNT_inc (data);
		1575	req->ptr2 = (char *)svptr + offset;
		1576	req->size = len;
		1577	req->int1 = flags;
		1578
		1579	REQ_SEND;
		1580	}
		1581	}
		1582
		1583	void
		1584	aio_mlock (SV8 *data, IV offset = 0, SV *length = &PL_sv_undef, SV *callback = &PL_sv_undef)
		1585	PPCODE:
		1586	{
		1587	STRLEN svlen;
		1588	char *svptr = SvPVbyte (data, svlen);
		1589	UV len = SvUV (length);
		1590
		1591	if (offset < 0)
		1592	offset += svlen;
		1593
		1594	if (offset < 0 || offset > svlen)
		1595	croak ("offset outside of scalar");
		1596
		1597	if (!SvOK (length) || len + offset > svlen)
		1598	len = svlen - offset;
		1599
		1600	{
		1601	dREQ;
		1602
		1603	req->type = EIO_MLOCK;
		1604	req->sv2 = SvREFCNT_inc (data);
		1605	req->ptr2 = (char *)svptr + offset;
		1606	req->size = len;
		1607
		1608	REQ_SEND;
		1609	}
		1610	}
		1611
		1612	void
		1613	aio_mlockall (IV flags, SV *callback = &PL_sv_undef)
		1614	PPCODE:
		1615	{
		1616	dREQ;
		1617
		1618	req->type = EIO_MLOCKALL;
		1619	req->int1 = flags;
		1620
		1621	REQ_SEND;
		1622	}
		1623
		1624	void
		1625	aio_fiemap (SV *fh, off_t start, SV *length, U32 flags, SV *count, SV *callback = &PL_sv_undef)
		1626	PPCODE:
		1627	{
		1628	int fd = s_fileno_croak (fh, 0);
		1629	dREQ;
		1630
		1631	req->type = EIO_CUSTOM;
		1632	req->sv1 = newSVsv (fh);
		1633	req->int1 = fd;
		1634
		1635	req->feed = fiemap;
		1636	#if HAVE_FIEMAP
		1637	/* keep our fingers crossed that the next two types are 64 bit */
		1638	req->offs = start;
		1639	req->size = SvOK (length) ? SvVAL64 (length) : ~0ULL;
		1640	req->int2 = flags;
		1641	req->int3 = SvOK (count) ? SvIV (count) : -1;
		1642	#endif
		1643
		1644	REQ_SEND;
		1645	}
		1646
		1647	void
		1648	aio_busy (double delay, SV *callback = &PL_sv_undef)
		1649	PPCODE:
		1650	{
		1651	dREQ;
		1652
		1653	req->type = EIO_BUSY;
		1654	req->nv1 = delay < 0. ? 0. : delay;
		1655
		1656	REQ_SEND;
		1657	}
		1658
		1659	void
		1660	aio_group (SV *callback = &PL_sv_undef)
		1661	PPCODE:
		1662	{
		1663	dREQ;
		1664
		1665	req->type = EIO_GROUP;
		1666
		1667	PUTBACK;
		1668	req_submit (req);
		1669	SPAGAIN;
		1670
		1671	XPUSHs (req_sv (req, aio_grp_stash));
		1672	}
		1673
		1674	void
		1675	aio_nop (SV *callback = &PL_sv_undef)
		1676	ALIAS:
		1677	aio_nop = EIO_NOP
		1678	aio_sync = EIO_SYNC
		1679	PPCODE:
		1680	{
		1681	dREQ;
		1682
		1683	req->type = ix;
		1684
		1685	REQ_SEND;
		1686	}
		1687
		1688	int
		1689	aioreq_pri (int pri = NO_INIT)
1036	CODE:	1690	CODE:
		1691	RETVAL = next_pri;
		1692	if (items > 0)
		1693	{
		1694	if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
		1695	if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
		1696	next_pri = pri;
		1697	}
		1698	OUTPUT:
		1699	RETVAL
		1700
		1701	void
		1702	aioreq_nice (int nice = 0)
		1703	CODE:
		1704	nice = next_pri - nice;
		1705	if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
		1706	if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
		1707	next_pri = nice;
		1708
		1709	void
		1710	flush ()
		1711	CODE:
1037	while (nreqs)	1712	while (eio_nreqs ())
1038	{	1713	{
1039	poll_wait ();	1714	poll_wait ();
1040	poll_cb ();	1715	poll_cb ();
1041	}	1716	}
1042		1717
1043	void	1718	int
1044	poll()	1719	poll ()
1045	PROTOTYPE:
1046	CODE:	1720	CODE:
1047	if (nreqs)
1048	{
1049	poll_wait ();	1721	poll_wait ();
1050	poll_cb ();	1722	RETVAL = poll_cb ();
1051	}
1052
1053	int
1054	poll_fileno()
1055	PROTOTYPE:
1056	CODE:
1057	RETVAL = respipe [0];
1058	OUTPUT:	1723	OUTPUT:
1059	RETVAL	1724	RETVAL
1060		1725
1061	int	1726	int
		1727	poll_fileno ()
		1728	CODE:
		1729	RETVAL = s_epipe_fd (&respipe);
		1730	OUTPUT:
		1731	RETVAL
		1732
		1733	int
1062	poll_cb(...)	1734	poll_cb (...)
1063	PROTOTYPE:	1735	PROTOTYPE:
1064	CODE:	1736	CODE:
1065	RETVAL = poll_cb ();	1737	RETVAL = poll_cb ();
1066	OUTPUT:	1738	OUTPUT:
1067	RETVAL	1739	RETVAL
1068		1740
1069	void	1741	void
1070	poll_wait()	1742	poll_wait ()
1071	PROTOTYPE:
1072	CODE:	1743	CODE:
1073	if (nreqs)
1074	poll_wait ();	1744	poll_wait ();
1075		1745
1076	int	1746	int
1077	nreqs()	1747	nreqs ()
1078	PROTOTYPE:
1079	CODE:	1748	CODE:
1080	RETVAL = nreqs;	1749	RETVAL = eio_nreqs ();
1081	OUTPUT:	1750	OUTPUT:
1082	RETVAL	1751	RETVAL
1083		1752
		1753	int
		1754	nready ()
		1755	CODE:
		1756	RETVAL = eio_nready ();
		1757	OUTPUT:
		1758	RETVAL
		1759
		1760	int
		1761	npending ()
		1762	CODE:
		1763	RETVAL = eio_npending ();
		1764	OUTPUT:
		1765	RETVAL
		1766
		1767	int
		1768	nthreads ()
		1769	CODE:
		1770	RETVAL = eio_nthreads ();
		1771	OUTPUT:
		1772	RETVAL
		1773
		1774	int
		1775	fadvise (aio_rfd fh, off_t offset, off_t length, IV advice)
		1776	CODE:
		1777	RETVAL = posix_fadvise (fh, offset, length, advice);
		1778	OUTPUT:
		1779	RETVAL
		1780
		1781	IV
		1782	sendfile (aio_wfd ofh, aio_rfd ifh, off_t offset, size_t count)
		1783	CODE:
		1784	RETVAL = eio_sendfile_sync (ofh, ifh, offset, count);
		1785	OUTPUT:
		1786	RETVAL
		1787
		1788	void
		1789	mmap (SV *scalar, STRLEN length, int prot, int flags, SV *fh = &PL_sv_undef, off_t offset = 0)
		1790	PPCODE:
		1791	sv_unmagic (scalar, MMAP_MAGIC);
		1792	{
		1793	int fd = SvOK (fh) ? s_fileno_croak (fh, flags & PROT_WRITE) : -1;
		1794	void *addr = (void *)mmap (0, length, prot, flags, fd, offset);
		1795	if (addr == (void *)-1)
		1796	XSRETURN_NO;
		1797
		1798	sv_force_normal (scalar);
		1799
		1800	/* we store the length in mg_obj, as namlen is I32 :/ */
		1801	sv_magicext (scalar, 0, MMAP_MAGIC, &mmap_vtbl, (char *)addr, 0)
		1802	->mg_obj = (SV *)length;
		1803
		1804	SvUPGRADE (scalar, SVt_PV); /* nop... */
		1805
		1806	if (!(prot & PROT_WRITE))
		1807	SvREADONLY_on (scalar);
		1808
		1809	if (SvLEN (scalar))
		1810	Safefree (SvPVX (scalar));
		1811
		1812	SvPVX (scalar) = (char *)addr;
		1813	SvCUR_set (scalar, length);
		1814	SvLEN_set (scalar, 0);
		1815	SvPOK_only (scalar);
		1816
		1817	XSRETURN_YES;
		1818	}
		1819
		1820	void
		1821	munmap (SV *scalar)
		1822	CODE:
		1823	sv_unmagic (scalar, MMAP_MAGIC);
		1824
		1825	int
		1826	madvise (SV *scalar, STRLEN offset = 0, SV *length = &PL_sv_undef, IV advice_or_prot)
		1827	ALIAS:
		1828	mprotect = 1
		1829	CODE:
		1830	{
		1831	STRLEN svlen;
		1832	void *addr = SvPVbyte (scalar, svlen);
		1833	STRLEN len = SvUV (length);
		1834
		1835	if (offset < 0)
		1836	offset += svlen;
		1837
		1838	if (offset < 0 || offset > svlen)
		1839	croak ("offset outside of scalar");
		1840
		1841	if (!SvOK (length) || len + offset > svlen)
		1842	len = svlen - offset;
		1843
		1844	addr = (void *)(((intptr_t)addr) + offset);
		1845	eio_page_align (&addr, &len);
		1846
		1847	switch (ix)
		1848	{
		1849	case 0: RETVAL = posix_madvise (addr, len, advice_or_prot); break;
		1850	case 1: RETVAL = mprotect (addr, len, advice_or_prot); break;
		1851	}
		1852	}
		1853	OUTPUT:
		1854	RETVAL
		1855
		1856	int
		1857	munlock (SV *scalar, STRLEN offset = 0, SV *length = &PL_sv_undef)
		1858	CODE:
		1859	{
		1860	STRLEN svlen;
		1861	void *addr = SvPVbyte (scalar, svlen);
		1862	size_t len = SvUV (length);
		1863
		1864	if (offset < 0)
		1865	offset += svlen;
		1866
		1867	if (offset < 0 || offset > svlen)
		1868	croak ("offset outside of scalar");
		1869
		1870	if (!SvOK (length) || len + offset > svlen)
		1871	len = svlen - offset;
		1872
		1873	addr = (void *)(((intptr_t)addr) + offset);
		1874	eio_page_align (&addr, &len);
		1875	#if _POSIX_MEMLOCK_RANGE
		1876	RETVAL = munlock (addr, len);
		1877	#else
		1878	RETVAL = EIO_ENOSYS ();
		1879	#endif
		1880	}
		1881	OUTPUT:
		1882	RETVAL
		1883
		1884	int
		1885	munlockall ()
		1886	CODE:
		1887	#if _POSIX_MEMLOCK
		1888	munlockall ();
		1889	#else
		1890	RETVAL = EIO_ENOSYS ();
		1891	#endif
		1892	OUTPUT:
		1893	RETVAL
		1894
		1895	int
		1896	splice (aio_rfd rfh, SV *off_in, aio_wfd wfh, SV *off_out, size_t length, unsigned int flags)
		1897	CODE:
		1898	{
		1899	#if HAVE_LINUX_SPLICE
		1900	loff_t off_in_, off_out_;
		1901	RETVAL = splice (
		1902	rfh, SvOK (off_in ) ? (off_in_ = SvVAL64 (off_in )), &off_in_ : 0,
		1903	wfh, SvOK (off_out) ? (off_out_ = SvVAL64 (off_out)), &off_out_ : 0,
		1904	length, flags
		1905	);
		1906	#else
		1907	RETVAL = EIO_ENOSYS ();
		1908	#endif
		1909	}
		1910	OUTPUT:
		1911	RETVAL
		1912
		1913	int
		1914	tee (aio_rfd rfh, aio_wfd wfh, size_t length, unsigned int flags)
		1915	CODE:
		1916	#if HAVE_LINUX_SPLICE
		1917	RETVAL = tee (rfh, wfh, length, flags);
		1918	#else
		1919	RETVAL = EIO_ENOSYS ();
		1920	#endif
		1921	OUTPUT:
		1922	RETVAL
		1923
		1924	int
		1925	pipesize (aio_rfd rfh, int new_size = -1)
		1926	PROTOTYPE: $;$
		1927	CODE:
		1928	#if defined(F_SETPIPE_SZ) && defined(F_GETPIPE_SZ)
		1929	if (new_size >= 0)
		1930	RETVAL = fcntl (rfh, F_SETPIPE_SZ, new_size);
		1931	else
		1932	RETVAL = fcntl (rfh, F_GETPIPE_SZ);
		1933	#else
		1934	errno = ENOSYS;
		1935	RETVAL = -1;
		1936	#endif
		1937	OUTPUT:
		1938	RETVAL
		1939
		1940	void
		1941	pipe2 (int flags = 0)
		1942	PROTOTYPE: ;$
		1943	PPCODE:
		1944	{
		1945	int fd[2];
		1946	int res;
		1947
		1948	if (flags)
		1949	#if HAVE_PIPE2
		1950	res = pipe2 (fd, flags);
		1951	#else
		1952	res = (errno = ENOSYS, -1);
		1953	#endif
		1954	else
		1955	res = pipe (fd);
		1956
		1957	if (!res)
		1958	{
		1959	EXTEND (SP, 2);
		1960	PUSHs (newmortalFH (fd[0], O_RDONLY));
		1961	PUSHs (newmortalFH (fd[1], O_WRONLY));
		1962	}
		1963	}
		1964
		1965	void _on_next_submit (SV *cb)
		1966	CODE:
		1967	SvREFCNT_dec (on_next_submit);
		1968	on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
		1969
		1970	PROTOTYPES: DISABLE
		1971
		1972	MODULE = IO::AIO PACKAGE = IO::AIO::WD
		1973
		1974	BOOT:
		1975	{
		1976	newCONSTSUB (aio_stash, "CWD" , newSVaio_wd (EIO_CWD ));
		1977	newCONSTSUB (aio_stash, "INVALID_WD", newSVaio_wd (EIO_INVALID_WD));
		1978	}
		1979
		1980	void
		1981	DESTROY (SV *self)
		1982	CODE:
		1983	{
		1984	aio_wd wd = SvAIO_WD (self);
		1985	#if HAVE_AT
		1986	{
		1987	SV *callback = &PL_sv_undef;
		1988	dREQ; /* clobbers next_pri :/ */
		1989	next_pri = req->pri; /* restore next_pri */
		1990	req->pri = EIO_PRI_MAX; /* better use max. priority to conserve fds */
		1991	req->type = EIO_WD_CLOSE;
		1992	req->wd = wd;
		1993	REQ_SEND;
		1994	}
		1995	#else
		1996	eio_wd_close_sync (wd);
		1997	#endif
		1998	}
		1999
		2000	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		2001
		2002	void
		2003	cancel (aio_req_ornot req)
		2004	CODE:
		2005	eio_cancel (req);
		2006
		2007	void
		2008	cb (aio_req_ornot req, SV *callback = NO_INIT)
		2009	PPCODE:
		2010	{
		2011	if (GIMME_V != G_VOID)
		2012	XPUSHs (req->callback ? sv_2mortal (newRV_inc (req->callback)) : &PL_sv_undef);
		2013
		2014	if (items > 1)
		2015	{
		2016	SV *cb_cv = get_cb (callback);
		2017
		2018	SvREFCNT_dec (req->callback);
		2019	req->callback = SvREFCNT_inc (cb_cv);
		2020	}
		2021	}
		2022
		2023	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		2024
		2025	void
		2026	add (aio_req grp, ...)
		2027	PPCODE:
		2028	{
		2029	int i;
		2030
		2031	if (grp->int1 == 2)
		2032	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		2033
		2034	for (i = 1; i < items; ++i )
		2035	{
		2036	aio_req req;
		2037
		2038	if (GIMME_V != G_VOID)
		2039	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		2040
		2041	req = SvAIO_REQ (ST (i));
		2042
		2043	if (req)
		2044	eio_grp_add (grp, req);
		2045	}
		2046	}
		2047
		2048	void
		2049	cancel_subs (aio_req_ornot req)
		2050	CODE:
		2051	req_cancel_subs (req);
		2052
		2053	void
		2054	result (aio_req grp, ...)
		2055	CODE:
		2056	{
		2057	int i;
		2058	AV *av;
		2059
		2060	grp->errorno = errno;
		2061
		2062	av = newAV ();
		2063	av_extend (av, items - 1);
		2064
		2065	for (i = 1; i < items; ++i )
		2066	av_push (av, newSVsv (ST (i)));
		2067
		2068	SvREFCNT_dec (grp->sv1);
		2069	grp->sv1 = (SV *)av;
		2070	}
		2071
		2072	void
		2073	errno (aio_req grp, int errorno = errno)
		2074	CODE:
		2075	grp->errorno = errorno;
		2076
		2077	void
		2078	limit (aio_req grp, int limit)
		2079	CODE:
		2080	eio_grp_limit (grp, limit);
		2081
		2082	void
		2083	feed (aio_req grp, SV *callback = &PL_sv_undef)
		2084	CODE:
		2085	{
		2086	SvREFCNT_dec (grp->sv2);
		2087	grp->sv2 = newSVsv (callback);
		2088	grp->feed = aio_grp_feed;
		2089
		2090	if (grp->int2 <= 0)
		2091	grp->int2 = 2;
		2092
		2093	eio_grp_limit (grp, grp->int2);
		2094	}
		2095

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