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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.36 by root, Tue Aug 23 01:18:04 2005 UTC vs.
Revision 1.178 by root, Fri Jan 7 21:45:42 2011 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
10	#include <pthread.h>	11	#include <stddef.h>
11		12	#include <stdlib.h>
		13	#include <errno.h>
12	#include <sys/types.h>	14	#include <sys/types.h>
13	#include <sys/stat.h>	15	#include <sys/stat.h>
14		16	#include <sys/statvfs.h>
15	#include <unistd.h>	17	#include <limits.h>
16	#include <fcntl.h>	18	#include <fcntl.h>
17	#include <signal.h>
18	#include <sched.h>	19	#include <sched.h>
19		20
20	#if HAVE_SENDFILE	21	#if _POSIX_MEMLOCK || _POSIX_MEMLOCK_RANGE || _POSIX_MAPPED_FILES
21	# if __linux
22	# include <sys/sendfile.h>	22	# include <sys/mman.h>
23	# elif __freebsd	23	#endif
24	# include <sys/socket.h>	24
		25	/* perl namespace pollution */
		26	#undef VERSION
		27
		28	#ifdef _WIN32
		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
		66	#else
		67
25	# include <sys/uio.h>	68	# include <sys/time.h>
26	# elif __hpux
27	# include <sys/socket.h>
28	# elif __solaris /* not yet */
29	# include <sys/sendfile.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/config.h"
		124	#include "libeio/eio.h"
		125
		126	#ifndef POSIX_FADV_NORMAL
		127	# define POSIX_FADV_NORMAL 0
		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 !HAVE_POSIX_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	#endif
		152	#ifndef POSIX_MADV_SEQUENTIAL
		153	# define POSIX_MADV_SEQUENTIAL 0
		154	#endif
		155	#ifndef POSIX_MADV_RANDOM
		156	# define POSIX_MADV_RANDOM 0
		157	#endif
		158	#ifndef POSIX_MADV_WILLNEED
		159	# define POSIX_MADV_WILLNEED 0
		160	#endif
		161	#ifndef POSIX_MADV_DONTNEED
		162	# define POSIX_MADV_DONTNEED 0
		163	#endif
		164
		165	#if !HAVE_POSIX_MADVISE
		166	# define posix_madvise(a,b,c) errno = ENOSYS /* also return ENOSYS */
		167	#endif
		168
		169	#ifndef PROT_NONE
		170	# define PROT_NONE 0
		171	#endif
		172	#ifndef PROT_READ
		173	# define PROT_READ 0
		174	#endif
		175	#ifndef PROT_WRITE
		176	# define PROT_READ 0
		177	#endif
		178	#ifndef PROT_EXEC
		179	# define PROT_EXEC 0
		180	#endif
		181
		182	#ifndef ST_NODEV
		183	# define ST_NODEV 0
		184	#endif
		185	#ifndef ST_NOEXEC
		186	# define ST_NOEXEC 0
		187	#endif
		188	#ifndef ST_SYNCHRONOUS
		189	# define ST_SYNCHRONOUS 0
		190	#endif
		191	#ifndef ST_MANDLOCK
		192	# define ST_MANDLOCK 0
		193	#endif
		194	#ifndef ST_WRITE
		195	# define ST_WRITE 0
		196	#endif
		197	#ifndef ST_APPEND
		198	# define ST_APPEND 0
		199	#endif
		200	#ifndef ST_IMMUTABLE
		201	# define ST_IMMUTABLE 0
		202	#endif
		203	#ifndef ST_NOATIME
		204	# define ST_NOATIME 0
		205	#endif
		206	#ifndef ST_NODIRATIME
		207	# define ST_NODIRATIME 0
		208	#endif
		209	#ifndef ST_RELATIME
		210	# define ST_RELATIME 0
		211	#endif
		212
		213	#ifndef MAP_ANONYMOUS
		214	# ifdef MAP_ANON
		215	# define MAP_ANONYMOUS MAP_ANON
30	# else	216	# else
31	# error sendfile support requested but not available	217	# define MAP_ANONYMOUS MAP_FIXED /* and hope this fails */
32	# endif	218	# endif
33	#endif	219	#endif
34		220	#ifndef MAP_HUGETLB
35	#if __ia64	221	# define MAP_HUGETLB 0
36	# define STACKSIZE 65536
37	#else
38	# define STACKSIZE 4096
39	#endif	222	#endif
		223	#ifndef MAP_LOCKED
		224	# define MAP_LOCKED 0
		225	#endif
		226	#ifndef MAP_NORESERVE
		227	# define MAP_NORESERVE 0
		228	#endif
		229	#ifndef MAP_POPULATE
		230	# define MAP_POPULATE 0
		231	#endif
		232	#ifndef MAP_NONBLOCK
		233	# define MAP_NONBLOCK 0
		234	#endif
		235
		236	#ifndef PAGESIZE
		237	# define PAGESIZE sysconf (_SC_PAGESIZE)
		238	#endif
		239
		240	static int req_invoke (eio_req *req);
		241	#define EIO_FINISH(req) req_invoke (req)
		242	static void req_destroy (eio_req *grp);
		243	#define EIO_DESTROY(req) req_destroy (req)
40		244
41	enum {	245	enum {
42	REQ_QUIT,	246	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
43	REQ_OPEN, REQ_CLOSE,
44	REQ_READ, REQ_WRITE, REQ_READAHEAD,
45	REQ_SENDFILE,
46	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
47	REQ_FSYNC, REQ_FDATASYNC,
48	REQ_UNLINK, REQ_RMDIR,
49	REQ_SYMLINK,
50	};	247	};
51		248
52	typedef struct aio_cb {	249	#include "libeio/eio.c"
53	struct aio_cb *volatile next;
54		250
55	int type;
56
57	int fd, fd2;
58	off_t offset;
59	size_t length;
60	ssize_t result;
61	mode_t mode; /* open */
62	int errorno;
63	SV *data, *callback;
64	SV *fh, *fh2;
65	void *dataptr, *data2ptr;
66	STRLEN dataoffset;
67
68	Stat_t *statdata;
69	} aio_cb;
70
71	typedef aio_cb *aio_req;	251	typedef eio_req *aio_req;
		252	typedef eio_req *aio_req_ornot;
72		253
73	static int started, wanted;	254	static SV *on_next_submit;
74	static volatile int nreqs;	255	static int next_pri = EIO_PRI_DEFAULT;
75	static int max_outstanding = 1<<30;	256	static int max_outstanding;
76	static int respipe [2];
77		257
78	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	258	static s_epipe respipe;
79	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
80	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
81		259
82	static volatile aio_req reqs, reqe; /* queue start, queue end */	260	static void req_destroy (aio_req req);
83	static volatile aio_req ress, rese; /* queue start, queue end */
84
85	static void free_req (aio_req req)	261	static void req_cancel (aio_req req);
86	{
87	if (req->data)
88	SvREFCNT_dec (req->data);
89		262
		263	static void want_poll (void)
		264	{
		265	/* write a dummy byte to the pipe so fh becomes ready */
		266	s_epipe_signal (&respipe);
		267	}
		268
		269	static void done_poll (void)
		270	{
		271	/* read any signals sent by the worker threads */
		272	s_epipe_drain (&respipe);
		273	}
		274
		275	/* must be called at most once */
		276	static SV *req_sv (aio_req req, HV *stash)
		277	{
90	if (req->fh)	278	if (!req->self)
91	SvREFCNT_dec (req->fh);
92
93	if (req->fh2)
94	SvREFCNT_dec (req->fh2);
95
96	if (req->statdata)
97	Safefree (req->statdata);
98
99	if (req->callback)
100	SvREFCNT_dec (req->callback);
101
102	Safefree (req);
103	}
104
105	static void
106	poll_wait ()
107	{
108	if (nreqs && !ress)
109	{	279	{
110	fd_set rfd;	280	req->self = (SV *)newHV ();
111	FD_ZERO(&rfd);	281	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
112	FD_SET(respipe [0], &rfd);
113
114	select (respipe [0] + 1, &rfd, 0, 0, 0);
115	}	282	}
116	}
117		283
118	static int	284	return sv_2mortal (sv_bless (newRV_inc (req->self), stash));
119	poll_cb ()	285	}
120	{
121	dSP;
122	int count = 0;
123	int do_croak = 0;
124	aio_req req;
125		286
126	for (;;)	287	static aio_req SvAIO_REQ (SV *sv)
		288	{
		289	MAGIC *mg;
		290
		291	if (!SvROK (sv)
		292	|| (SvSTASH (SvRV (sv)) != aio_grp_stash
		293	&& SvSTASH (SvRV (sv)) != aio_req_stash
		294	&& !sv_derived_from (sv, "IO::AIO::REQ")))
		295	croak ("object of class IO::AIO::REQ expected");
		296
		297	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		298
		299	return mg ? (aio_req)mg->mg_ptr : 0;
		300	}
		301
		302	static void aio_grp_feed (aio_req grp)
		303	{
		304	if (grp->sv2 && SvOK (grp->sv2))
127	{	305	{
128	pthread_mutex_lock (&reslock);	306	dSP;
129	req = ress;
130		307
131	if (req)	308	ENTER;
		309	SAVETMPS;
		310	PUSHMARK (SP);
		311	XPUSHs (req_sv (grp, aio_grp_stash));
		312	PUTBACK;
		313	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		314	SPAGAIN;
		315	FREETMPS;
		316	LEAVE;
		317	}
		318	}
		319
		320	static void req_submit (eio_req *req)
		321	{
		322	eio_submit (req);
		323
		324	if (expect_false (on_next_submit))
		325	{
		326	dSP;
		327	SV *cb = sv_2mortal (on_next_submit);
		328
		329	on_next_submit = 0;
		330
		331	PUSHMARK (SP);
		332	PUTBACK;
		333	call_sv (cb, G_DISCARD | G_EVAL);
		334	}
		335	}
		336
		337	static int req_invoke (eio_req *req)
		338	{
		339	if (req->flags & FLAG_SV2_RO_OFF)
		340	SvREADONLY_off (req->sv2);
		341
		342	if (!EIO_CANCELLED (req) && req->callback)
		343	{
		344	dSP;
		345	static SV *sv_result_cache; /* caches the result integer SV */
		346	SV *sv_result;
		347
		348	ENTER;
		349	SAVETMPS;
		350	PUSHMARK (SP);
		351	EXTEND (SP, 1);
		352
		353	/* do not recreate the result IV from scratch each time */
		354	if (expect_true (sv_result_cache))
132	{	355	{
133	ress = req->next;	356	sv_result = sv_result_cache; sv_result_cache = 0;
134		357	SvIV_set (sv_result, req->result);
135	if (!ress)	358	SvIOK_only (sv_result);
136	{
137	/* read any signals sent by the worker threads */
138	char buf [32];
139	while (read (respipe [0], buf, 32) == 32)
140	;
141
142	rese = 0;
143	}
144	}
145
146	pthread_mutex_unlock (&reslock);
147
148	if (!req)
149	break;
150
151	nreqs--;
152
153	if (req->type == REQ_QUIT)
154	started--;
155	else
156	{
157	int errorno = errno;
158	errno = req->errorno;
159
160	if (req->type == REQ_READ)
161	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
162
163	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
164	SvREADONLY_off (req->data);
165
166	if (req->statdata)
167	{
168	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
169	PL_laststatval = req->result;
170	PL_statcache = *(req->statdata);
171	}
172
173	ENTER;
174	PUSHMARK (SP);
175	XPUSHs (sv_2mortal (newSViv (req->result)));
176
177	if (req->type == REQ_OPEN)
178	{
179	/* convert fd to fh */
180	SV *fh;
181
182	PUTBACK;
183	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
184	SPAGAIN;
185
186	fh = SvREFCNT_inc (POPs);
187
188	PUSHMARK (SP);
189	XPUSHs (sv_2mortal (fh));
190	}
191
192	if (SvOK (req->callback))
193	{
194	PUTBACK;
195	call_sv (req->callback, G_VOID | G_EVAL);
196	SPAGAIN;
197
198	if (SvTRUE (ERRSV))
199	{
200	free_req (req);
201	croak (0);
202	}
203	}
204
205	LEAVE;
206
207	errno = errorno;
208	count++;
209	}
210
211	free_req (req);
212	}
213
214	return count;
215	}
216
217	static void *aio_proc(void *arg);
218
219	static void
220	start_thread (void)
221	{
222	sigset_t fullsigset, oldsigset;
223	pthread_t tid;
224	pthread_attr_t attr;
225
226	pthread_attr_init (&attr);
227	pthread_attr_setstacksize (&attr, STACKSIZE);
228	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
229
230	sigfillset (&fullsigset);
231	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
232
233	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
234	started++;
235
236	sigprocmask (SIG_SETMASK, &oldsigset, 0);
237	}
238
239	static void
240	send_req (aio_req req)
241	{
242	while (started < wanted && nreqs >= started)
243	start_thread ();
244
245	nreqs++;
246
247	pthread_mutex_lock (&reqlock);
248
249	req->next = 0;
250
251	if (reqe)
252	{
253	reqe->next = req;
254	reqe = req;
255	}
256	else
257	reqe = reqs = req;
258
259	pthread_cond_signal (&reqwait);
260	pthread_mutex_unlock (&reqlock);
261
262	if (nreqs > max_outstanding)
263	for (;;)
264	{
265	poll_cb ();
266
267	if (nreqs <= max_outstanding)
268	break;
269
270	poll_wait ();
271	}
272	}
273
274	static void
275	end_thread (void)
276	{
277	aio_req req;
278	Newz (0, req, 1, aio_cb);
279	req->type = REQ_QUIT;
280
281	send_req (req);
282	}
283
284	static void min_parallel (int nthreads)
285	{
286	if (wanted < nthreads)
287	wanted = nthreads;
288	}
289
290	static void max_parallel (int nthreads)
291	{
292	int cur = started;
293
294	if (wanted > nthreads)
295	wanted = nthreads;
296
297	while (cur > wanted)
298	{
299	end_thread ();
300	cur--;
301	}
302
303	while (started > wanted)
304	{
305	poll_wait ();
306	poll_cb ();
307	}
308	}
309
310	static void create_pipe ()
311	{
312	if (pipe (respipe))
313	croak ("unable to initialize result pipe");
314
315	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
316	croak ("cannot set result pipe to nonblocking mode");
317
318	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
319	croak ("cannot set result pipe to nonblocking mode");
320	}
321
322	static void atfork_prepare (void)
323	{
324	pthread_mutex_lock (&reqlock);
325	pthread_mutex_lock (&reslock);
326	}
327
328	static void atfork_parent (void)
329	{
330	pthread_mutex_unlock (&reslock);
331	pthread_mutex_unlock (&reqlock);
332	}
333
334	static void atfork_child (void)
335	{
336	aio_req prv;
337
338	started = 0;
339
340	while (reqs)
341	{
342	prv = reqs;
343	reqs = prv->next;
344	free_req (prv);
345	}
346
347	reqs = reqe = 0;
348
349	while (ress)
350	{
351	prv = ress;
352	ress = prv->next;
353	free_req (prv);
354	}
355
356	ress = rese = 0;
357
358	close (respipe [0]);
359	close (respipe [1]);
360	create_pipe ();
361
362	atfork_parent ();
363	}
364
365	/*****************************************************************************/
366	/* work around various missing functions */
367
368	#if !HAVE_PREADWRITE
369	# define pread aio_pread
370	# define pwrite aio_pwrite
371
372	/*
373	* make our pread/pwrite safe against themselves, but not against
374	* normal read/write by using a mutex. slows down execution a lot,
375	* but that's your problem, not mine.
376	*/
377	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;
378
379	static ssize_t
380	pread (int fd, void *buf, size_t count, off_t offset)
381	{
382	ssize_t res;
383	off_t ooffset;
384
385	pthread_mutex_lock (&iolock);
386	ooffset = lseek (fd, 0, SEEK_CUR);
387	lseek (fd, offset, SEEK_SET);
388	res = read (fd, buf, count);
389	lseek (fd, ooffset, SEEK_SET);
390	pthread_mutex_unlock (&iolock);
391
392	return res;
393	}
394
395	static ssize_t
396	pwrite (int fd, void *buf, size_t count, off_t offset)
397	{
398	ssize_t res;
399	off_t ooffset;
400
401	pthread_mutex_lock (&iolock);
402	ooffset = lseek (fd, 0, SEEK_CUR);
403	lseek (fd, offset, SEEK_SET);
404	res = write (fd, buf, count);
405	lseek (fd, offset, SEEK_SET);
406	pthread_mutex_unlock (&iolock);
407
408	return res;
409	}
410	#endif
411
412	#if !HAVE_FDATASYNC
413	# define fdatasync fsync
414	#endif
415
416	#if !HAVE_READAHEAD
417	# define readahead aio_readahead
418
419	static char readahead_buf[4096];
420
421	static ssize_t
422	readahead (int fd, off_t offset, size_t count)
423	{
424	while (count > 0)
425	{
426	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
427
428	pread (fd, readahead_buf, len, offset);
429	offset += len;
430	count -= len;
431	}
432
433	errno = 0;
434	}
435	#endif
436
437	/* sendfile always needs emulation */
438	static ssize_t
439	sendfile_ (int ofd, int ifd, off_t offset, size_t count)
440	{
441	ssize_t res;
442
443	if (!count)
444	return 0;
445
446	#if HAVE_SENDFILE
447	# if __linux
448	res = sendfile (ofd, ifd, &offset, count);
449
450	# elif __freebsd
451	/*
452	* Of course, the freebsd sendfile is a dire hack with no thoughts
453	* wasted on making it similar to other I/O functions.
454	*/
455	{
456	off_t sbytes;
457	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
458
459	if (res < 0 && sbytes)
460	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
461	res = sbytes;
462	}
463
464	# elif __hpux
465	res = sendfile (ofd, ifd, offset, count, 0, 0);
466
467	# elif __solaris
468	{
469	struct sendfilevec vec;
470	size_t sbytes;
471
472	vec.sfv_fd = ifd;
473	vec.sfv_flag = 0;
474	vec.sfv_off = offset;
475	vec.sfv_len = count;
476
477	res = sendfilev (ofd, &vec, 1, &sbytes);
478
479	if (res < 0 && sbytes)
480	res = sbytes;
481	}
482
483	# else
484	res = -1;
485	errno = ENOSYS;
486	# endif
487	#endif
488
489	if (res < 0
490	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
491	#if __solaris
492	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
493	#endif
494	)
495	)
496	{
497	/* emulate sendfile. this is a major pain in the ass */
498	char *buf = malloc (4096);
499	res = 0;
500
501	for (;;)
502	{
503	ssize_t cnt;
504
505	cnt = pread (ifd, buf, 4096, offset);
506
507	if (cnt <= 0)
508	{
509	if (cnt && !res) res = -1;
510	break;
511	}
512
513	cnt = write (ofd, buf, cnt);
514
515	if (cnt <= 0)
516	{
517	if (cnt && !res) res = -1;
518	break;
519	}
520
521	offset += cnt;
522	res += cnt;
523	}
524
525	{
526	int errorno = errno;
527	free (buf);
528	errno = errorno;
529	}
530	}
531
532	return res;
533	}
534
535	/*****************************************************************************/
536
537	static void *
538	aio_proc (void *thr_arg)
539	{
540	aio_req req;
541	int type;
542
543	do
544	{
545	pthread_mutex_lock (&reqlock);
546
547	for (;;)
548	{
549	req = reqs;
550
551	if (reqs)
552	{
553	reqs = reqs->next;
554	if (!reqs) reqe = 0;
555	}
556
557	if (req)
558	break;
559
560	pthread_cond_wait (&reqwait, &reqlock);
561	}
562
563	pthread_mutex_unlock (&reqlock);
564
565	errno = 0; /* strictly unnecessary */
566
567	type = req->type;
568
569	switch (type)
570	{
571	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
572	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
573
574	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
575	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
576
577	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
578	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
579	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
580
581	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
582	case REQ_CLOSE: req->result = close (req->fd); break;
583	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
584	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
585	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
586
587	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
588	case REQ_FSYNC: req->result = fsync (req->fd); break;
589
590	case REQ_QUIT:
591	break;
592
593	default:
594	req->result = ENOSYS;
595	break;
596	}
597
598	req->errorno = errno;
599
600	pthread_mutex_lock (&reslock);
601
602	req->next = 0;
603
604	if (rese)
605	{
606	rese->next = req;
607	rese = req;
608	}	359	}
609	else	360	else
610	{	361	{
611	rese = ress = req;	362	sv_result = newSViv (req->result);
612		363	SvREADONLY_on (sv_result);
613	/* write a dummy byte to the pipe so fh becomes ready */
614	write (respipe [1], &respipe, 1);
615	}	364	}
616		365
617	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(), so 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;
618	}	557	}
619	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	# define PROT_NONE 0
		644	# define PROT_WRITE 0
		645	# define MAP_PRIVATE 0
		646	# define MAP_SHARED 0
		647	# define MAP_FIXED 0
		648	#endif
		649
		650	#define MMAP_MAGIC PERL_MAGIC_ext
		651
		652	static int
		653	mmap_free (pTHX_ SV *sv, MAGIC *mg)
		654	{
		655	int old_errno = errno;
		656	munmap (mg->mg_ptr, (size_t)mg->mg_obj);
		657	errno = old_errno;
		658
		659	mg->mg_obj = 0; /* just in case */
		660
		661	SvREADONLY_off (sv);
		662
		663	if (SvPVX (sv) != mg->mg_ptr)
		664	croak ("ERROR: IO::AIO::mmap-mapped scalar changed location, detected");
		665
		666	SvCUR_set (sv, 0);
		667	SvPVX (sv) = 0;
		668	SvOK_off (sv);
620		669
621	return 0;	670	return 0;
622	}	671	}
623		672
		673	static MGVTBL mmap_vtbl = {
		674	0, 0, 0, 0, mmap_free
		675	};
		676
		677	/*****************************************************************************/
		678
		679	static SV *
		680	get_cb (SV *cb_sv)
		681	{
		682	SvGETMAGIC (cb_sv);
		683	return SvOK (cb_sv) ? s_get_cv_croak (cb_sv) : 0;
		684	}
		685
624	#define dREQ \	686	#define dREQ \
		687	SV *cb_cv; \
625	aio_req req; \	688	aio_req req; \
		689	int req_pri = next_pri; \
		690	next_pri = EIO_PRI_DEFAULT; \
626	\	691	\
627	if (SvOK (callback) && !SvROK (callback)) \	692	cb_cv = get_cb (callback); \
628	croak ("clalback must be undef or of reference type"); \
629	\	693	\
630	Newz (0, req, 1, aio_cb); \	694	Newz (0, req, 1, eio_req); \
631	if (!req) \	695	if (!req) \
632	croak ("out of memory during aio_req allocation"); \	696	croak ("out of memory during eio_req allocation"); \
633	\	697	\
634	req->callback = newSVsv (callback);	698	req->callback = SvREFCNT_inc (cb_cv); \
635		699	req->pri = req_pri
		700
		701	#define REQ_SEND \
		702	PUTBACK; \
		703	req_submit (req); \
		704	SPAGAIN; \
		705	\
		706	if (GIMME_V != G_VOID) \
		707	XPUSHs (req_sv (req, aio_req_stash));
		708
636	MODULE = IO::AIO PACKAGE = IO::AIO	709	MODULE = IO::AIO PACKAGE = IO::AIO
637		710
638	PROTOTYPES: ENABLE	711	PROTOTYPES: ENABLE
639		712
640	BOOT:	713	BOOT:
641	{	714	{
		715	static const struct {
		716	const char *name;
		717	IV iv;
		718	} *civ, const_iv[] = {
		719	# define const_niv(name, value) { # name, (IV) value },
		720	# define const_iv(name) { # name, (IV) name },
		721	# define const_eio(name) { # name, (IV) EIO_ ## name },
		722	const_iv (EXDEV)
		723	const_iv (ENOSYS)
		724	const_iv (O_RDONLY)
		725	const_iv (O_WRONLY)
		726	const_iv (O_RDWR)
		727	const_iv (O_CREAT)
		728	const_iv (O_TRUNC)
		729	const_iv (O_EXCL)
		730	const_iv (O_APPEND)
		731	#ifndef _WIN32
		732	const_iv (S_IFIFO)
		733	#endif
		734	const_niv (FADV_NORMAL , POSIX_FADV_NORMAL)
		735	const_niv (FADV_SEQUENTIAL, POSIX_FADV_SEQUENTIAL)
		736	const_niv (FADV_RANDOM , POSIX_FADV_RANDOM)
		737	const_niv (FADV_NOREUSE , POSIX_FADV_NOREUSE)
		738	const_niv (FADV_WILLNEED , POSIX_FADV_WILLNEED)
		739	const_niv (FADV_DONTNEED , POSIX_FADV_DONTNEED)
		740
		741	const_niv (MADV_NORMAL , POSIX_MADV_NORMAL)
		742	const_niv (MADV_SEQUENTIAL, POSIX_MADV_SEQUENTIAL)
		743	const_niv (MADV_RANDOM , POSIX_MADV_RANDOM)
		744	const_niv (MADV_WILLNEED , POSIX_MADV_WILLNEED)
		745	const_niv (MADV_DONTNEED , POSIX_MADV_DONTNEED)
		746
		747	const_iv (ST_RDONLY)
		748	const_iv (ST_NOSUID)
		749	const_iv (ST_NODEV)
		750	const_iv (ST_NOEXEC)
		751	const_iv (ST_SYNCHRONOUS)
		752	const_iv (ST_MANDLOCK)
		753	const_iv (ST_WRITE)
		754	const_iv (ST_APPEND)
		755	const_iv (ST_IMMUTABLE)
		756	const_iv (ST_NOATIME)
		757	const_iv (ST_NODIRATIME)
		758	const_iv (ST_RELATIME)
		759
		760	const_iv (PROT_NONE)
		761	const_iv (PROT_EXEC)
		762	const_iv (PROT_READ)
		763	const_iv (PROT_WRITE)
		764
		765	/*const_iv (MAP_FIXED)*/
		766	const_iv (MAP_PRIVATE)
		767	const_iv (MAP_SHARED)
		768	const_iv (MAP_ANONYMOUS)
		769
		770	/* linuxish */
		771	const_iv (MAP_HUGETLB)
		772	const_iv (MAP_LOCKED)
		773	const_iv (MAP_NORESERVE)
		774	const_iv (MAP_POPULATE)
		775	const_iv (MAP_NONBLOCK)
		776
		777	const_eio (MCL_FUTURE)
		778	const_eio (MCL_CURRENT)
		779
		780	const_eio (MS_ASYNC)
		781	const_eio (MS_INVALIDATE)
		782	const_eio (MS_SYNC)
		783
		784	const_eio (MT_MODIFY)
		785
		786	const_eio (SYNC_FILE_RANGE_WAIT_BEFORE)
		787	const_eio (SYNC_FILE_RANGE_WRITE)
		788	const_eio (SYNC_FILE_RANGE_WAIT_AFTER)
		789
		790	const_eio (READDIR_DENTS)
		791	const_eio (READDIR_DIRS_FIRST)
		792	const_eio (READDIR_STAT_ORDER)
		793	const_eio (READDIR_FOUND_UNKNOWN)
		794
		795	const_eio (DT_UNKNOWN)
		796	const_eio (DT_FIFO)
		797	const_eio (DT_CHR)
		798	const_eio (DT_DIR)
		799	const_eio (DT_BLK)
		800	const_eio (DT_REG)
		801	const_eio (DT_LNK)
		802	const_eio (DT_SOCK)
		803	const_eio (DT_WHT)
		804	};
		805
		806	aio_stash = gv_stashpv ("IO::AIO" , 1);
		807	aio_req_stash = gv_stashpv ("IO::AIO::REQ", 1);
		808	aio_grp_stash = gv_stashpv ("IO::AIO::GRP", 1);
		809
		810	for (civ = const_iv + sizeof (const_iv) / sizeof (const_iv [0]); civ-- > const_iv; )
		811	newCONSTSUB (aio_stash, (char *)civ->name, newSViv (civ->iv));
		812
		813	newCONSTSUB (aio_stash, "PAGESIZE", newSViv (PAGESIZE));
		814
642	create_pipe ();	815	create_respipe ();
643	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
644	}
645		816
		817	if (eio_init (want_poll, done_poll) < 0)
		818	croak ("IO::AIO: unable to initialise eio library");
		819
		820	/* atfork child called in fifo order, so before eio's handler */
		821	X_THREAD_ATFORK (0, 0, atfork_child);
		822	}
		823
646	void	824	void
647	min_parallel(nthreads)	825	max_poll_reqs (int nreqs)
648	int nthreads
649	PROTOTYPE: $	826	PROTOTYPE: $
		827	CODE:
		828	eio_set_max_poll_reqs (nreqs);
650		829
651	void	830	void
652	max_parallel(nthreads)	831	max_poll_time (double nseconds)
653	int nthreads
654	PROTOTYPE: $	832	PROTOTYPE: $
655
656	int
657	max_outstanding(nreqs)
658	int nreqs
659	PROTOTYPE: $
660	CODE:	833	CODE:
661	RETVAL = max_outstanding;	834	eio_set_max_poll_time (nseconds);
		835
		836	void
		837	min_parallel (int nthreads)
		838	PROTOTYPE: $
		839	CODE:
		840	eio_set_min_parallel (nthreads);
		841
		842	void
		843	max_parallel (int nthreads)
		844	PROTOTYPE: $
		845	CODE:
		846	eio_set_max_parallel (nthreads);
		847
		848	void
		849	max_idle (int nthreads)
		850	PROTOTYPE: $
		851	CODE:
		852	eio_set_max_idle (nthreads);
		853
		854	void
		855	max_outstanding (int maxreqs)
		856	PROTOTYPE: $
		857	CODE:
662	max_outstanding = nreqs;	858	max_outstanding = maxreqs;
663		859
664	void	860	void
665	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	861	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
666	SV * pathname
667	int flags
668	int mode
669	SV * callback
670	PROTOTYPE: $$$;$
671	CODE:	862	PPCODE:
672	{	863	{
673	dREQ;	864	dREQ;
674		865
675	req->type = REQ_OPEN;	866	req->type = EIO_OPEN;
676	req->data = newSVsv (pathname);	867	req->sv1 = newSVsv (pathname);
677	req->dataptr = SvPVbyte_nolen (req->data);	868	req->ptr1 = SvPVbyte_nolen (req->sv1);
678	req->fd = flags;	869	req->int1 = flags;
679	req->mode = mode;	870	req->int2 = mode;
680		871
681	send_req (req);	872	REQ_SEND;
682	}	873	}
683		874
684	void	875	void
685	aio_close(fh,callback=&PL_sv_undef)	876	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
686	SV * fh
687	SV * callback
688	PROTOTYPE: $;$
689	ALIAS:	877	ALIAS:
690	aio_close = REQ_CLOSE
691	aio_fsync = REQ_FSYNC	878	aio_fsync = EIO_FSYNC
692	aio_fdatasync = REQ_FDATASYNC	879	aio_fdatasync = EIO_FDATASYNC
693	CODE:	880	PPCODE:
694	{	881	{
		882	int fd = s_fileno_croak (fh, 0);
695	dREQ;	883	dREQ;
696		884
697	req->type = ix;	885	req->type = ix;
698	req->fh = newSVsv (fh);	886	req->sv1 = newSVsv (fh);
699	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	887	req->int1 = fd;
700		888
701	send_req (req);	889	REQ_SEND (req);
702	}	890	}
703		891
704	void	892	void
		893	aio_sync_file_range (SV *fh, off_t offset, size_t nbytes, UV flags, SV *callback=&PL_sv_undef)
		894	PPCODE:
		895	{
		896	int fd = s_fileno_croak (fh, 0);
		897	dREQ;
		898
		899	req->type = EIO_SYNC_FILE_RANGE;
		900	req->sv1 = newSVsv (fh);
		901	req->int1 = fd;
		902	req->offs = offset;
		903	req->size = nbytes;
		904	req->int2 = flags;
		905
		906	REQ_SEND (req);
		907	}
		908
		909	void
		910	aio_close (SV *fh, SV *callback=&PL_sv_undef)
		911	PPCODE:
		912	{
		913	static int close_pipe = -1; /* dummy fd to close fds via dup2 */
		914	int fd = s_fileno_croak (fh, 0);
		915	dREQ;
		916
		917	if (close_pipe < 0)
		918	{
		919	int pipefd [2];
		920
		921	if (pipe (pipefd) < 0
		922	|| close (pipefd [1]) < 0
		923	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
		924	abort (); /*D*/
		925
		926	close_pipe = pipefd [0];
		927	}
		928
		929	req->type = EIO_DUP2;
		930	req->int1 = close_pipe;
		931	req->sv2 = newSVsv (fh);
		932	req->int2 = fd;
		933
		934	REQ_SEND (req);
		935	}
		936
		937	void
705	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	938	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
706	SV * fh
707	UV offset
708	UV length
709	SV * data
710	UV dataoffset
711	SV * callback
712	ALIAS:	939	ALIAS:
713	aio_read = REQ_READ	940	aio_read = EIO_READ
714	aio_write = REQ_WRITE	941	aio_write = EIO_WRITE
715	PROTOTYPE: $$$$$;$
716	CODE:	942	PPCODE:
717	{	943	{
718	aio_req req;
719	STRLEN svlen;	944	STRLEN svlen;
		945	int fd = s_fileno_croak (fh, ix == EIO_WRITE);
720	char *svptr = SvPVbyte (data, svlen);	946	char *svptr = SvPVbyte (data, svlen);
721		947	UV len = SvUV (length);
722	SvUPGRADE (data, SVt_PV);
723	SvPOK_on (data);
724		948
725	if (dataoffset < 0)	949	if (dataoffset < 0)
726	dataoffset += svlen;	950	dataoffset += svlen;
727		951
728	if (dataoffset < 0 || dataoffset > svlen)	952	if (dataoffset < 0 || dataoffset > svlen)
729	croak ("data offset outside of string");	953	croak ("dataoffset outside of data scalar");
730		954
731	if (ix == REQ_WRITE)	955	if (ix == EIO_WRITE)
732	{	956	{
733	/* write: check length and adjust. */	957	/* write: check length and adjust. */
734	if (length < 0 || length + dataoffset > svlen)	958	if (!SvOK (length) || len + dataoffset > svlen)
735	length = svlen - dataoffset;	959	len = svlen - dataoffset;
736	}	960	}
737	else	961	else
738	{	962	{
739	/* read: grow scalar as necessary */	963	/* read: check type and grow scalar as necessary */
		964	SvUPGRADE (data, SVt_PV);
740	svptr = SvGROW (data, length + dataoffset);	965	svptr = SvGROW (data, len + dataoffset + 1);
741	}	966	}
742
743	if (length < 0)
744	croak ("length must not be negative");
745		967
746	{	968	{
747	dREQ;	969	dREQ;
748		970
749	req->type = ix;	971	req->type = ix;
750	req->fh = newSVsv (fh);	972	req->sv1 = newSVsv (fh);
751	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	973	req->int1 = fd;
752	: IoOFP (sv_2io (fh)));	974	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
753	req->offset = offset;	975	req->size = len;
754	req->length = length;
755	req->data = SvREFCNT_inc (data);	976	req->sv2 = SvREFCNT_inc (data);
756	req->dataptr = (char *)svptr + dataoffset;	977	req->ptr2 = (char *)svptr + dataoffset;
		978	req->stroffset = dataoffset;
757		979
758	if (!SvREADONLY (data))	980	if (!SvREADONLY (data))
759	{	981	{
760	SvREADONLY_on (data);	982	SvREADONLY_on (data);
761	req->data2ptr = (void *)data;	983	req->flags |= FLAG_SV2_RO_OFF;
762	}	984	}
763		985
764	send_req (req);	986	REQ_SEND;
765	}	987	}
766	}	988	}
767		989
768	void	990	void
769	aio_sendfile(out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	991	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
770	SV * out_fh
771	SV * in_fh
772	UV in_offset
773	UV length
774	SV * callback
775	PROTOTYPE: $$$$;$
776	CODE:	992	PPCODE:
777	{	993	{
		994	SV *data;
		995	dREQ;
		996
		997	req->type = EIO_READLINK;
		998	req->sv1 = newSVsv (path);
		999	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1000
		1001	REQ_SEND;
		1002	}
		1003
		1004	void
		1005	aio_sendfile (SV *out_fh, SV *in_fh, off_t in_offset, size_t length, SV *callback=&PL_sv_undef)
		1006	PPCODE:
		1007	{
		1008	int ifd = s_fileno_croak (in_fh , 0);
		1009	int ofd = s_fileno_croak (out_fh, 1);
778	dREQ;	1010	dREQ;
779		1011
780	req->type = REQ_SENDFILE;	1012	req->type = EIO_SENDFILE;
781	req->fh = newSVsv (out_fh);	1013	req->sv1 = newSVsv (out_fh);
782	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1014	req->int1 = ofd;
783	req->fh2 = newSVsv (in_fh);	1015	req->sv2 = newSVsv (in_fh);
784	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1016	req->int2 = ifd;
785	req->offset = in_offset;	1017	req->offs = in_offset;
786	req->length = length;	1018	req->size = length;
787		1019
788	send_req (req);	1020	REQ_SEND;
789	}	1021	}
790		1022
791	void	1023	void
792	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1024	aio_readahead (SV *fh, off_t offset, size_t length, SV *callback=&PL_sv_undef)
793	SV * fh
794	UV offset
795	IV length
796	SV * callback
797	PROTOTYPE: $$$;$
798	CODE:	1025	PPCODE:
799	{	1026	{
		1027	int fd = s_fileno_croak (fh, 0);
800	dREQ;	1028	dREQ;
801		1029
802	req->type = REQ_READAHEAD;	1030	req->type = EIO_READAHEAD;
803	req->fh = newSVsv (fh);	1031	req->sv1 = newSVsv (fh);
804	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1032	req->int1 = fd;
805	req->offset = offset;	1033	req->offs = offset;
806	req->length = length;	1034	req->size = length;
807		1035
808	send_req (req);	1036	REQ_SEND;
809	}	1037	}
810		1038
811	void	1039	void
812	aio_stat(fh_or_path,callback=&PL_sv_undef)	1040	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
813	SV * fh_or_path
814	SV * callback
815	ALIAS:	1041	ALIAS:
816	aio_stat = REQ_STAT	1042	aio_stat = EIO_STAT
817	aio_lstat = REQ_LSTAT	1043	aio_lstat = EIO_LSTAT
		1044	aio_statvfs = EIO_STATVFS
818	CODE:	1045	PPCODE:
819	{	1046	{
820	dREQ;	1047	dREQ;
821		1048
822	New (0, req->statdata, 1, Stat_t);	1049	req->sv1 = newSVsv (fh_or_path);
823	if (!req->statdata)
824	{
825	free_req (req);
826	croak ("out of memory during aio_req->statdata allocation");
827	}
828		1050
829	if (SvPOK (fh_or_path))	1051	if (SvPOK (req->sv1))
830	{	1052	{
831	req->type = ix;	1053	req->type = ix;
832	req->data = newSVsv (fh_or_path);
833	req->dataptr = SvPVbyte_nolen (req->data);	1054	req->ptr1 = SvPVbyte_nolen (req->sv1);
834	}	1055	}
835	else	1056	else
836	{	1057	{
837	req->type = REQ_FSTAT;	1058	req->type = ix == EIO_STATVFS ? EIO_FSTATVFS : EIO_FSTAT;
838	req->fh = newSVsv (fh_or_path);
839	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1059	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
840	}	1060	}
841		1061
842	send_req (req);	1062	REQ_SEND;
843	}	1063	}
844		1064
845	void	1065	void
		1066	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		1067	PPCODE:
		1068	{
		1069	dREQ;
		1070
		1071	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		1072	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		1073	req->sv1 = newSVsv (fh_or_path);
		1074
		1075	if (SvPOK (req->sv1))
		1076	{
		1077	req->type = EIO_UTIME;
		1078	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1079	}
		1080	else
		1081	{
		1082	req->type = EIO_FUTIME;
		1083	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1084	}
		1085
		1086	REQ_SEND;
		1087	}
		1088
		1089	void
		1090	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		1091	PPCODE:
		1092	{
		1093	dREQ;
		1094
		1095	req->sv1 = newSVsv (fh_or_path);
		1096	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		1097
		1098	if (SvPOK (req->sv1))
		1099	{
		1100	req->type = EIO_TRUNCATE;
		1101	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1102	}
		1103	else
		1104	{
		1105	req->type = EIO_FTRUNCATE;
		1106	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1107	}
		1108
		1109	REQ_SEND;
		1110	}
		1111
		1112	void
		1113	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		1114	ALIAS:
		1115	aio_chmod = EIO_CHMOD
		1116	aio_mkdir = EIO_MKDIR
		1117	PPCODE:
		1118	{
		1119	dREQ;
		1120
		1121	req->int2 = mode;
		1122	req->sv1 = newSVsv (fh_or_path);
		1123
		1124	if (SvPOK (req->sv1))
		1125	{
		1126	req->type = ix;
		1127	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1128	}
		1129	else
		1130	{
		1131	req->type = EIO_FCHMOD;
		1132	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1133	}
		1134
		1135	REQ_SEND;
		1136	}
		1137
		1138	void
		1139	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		1140	PPCODE:
		1141	{
		1142	dREQ;
		1143
		1144	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		1145	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		1146	req->sv1 = newSVsv (fh_or_path);
		1147
		1148	if (SvPOK (req->sv1))
		1149	{
		1150	req->type = EIO_CHOWN;
		1151	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1152	}
		1153	else
		1154	{
		1155	req->type = EIO_FCHOWN;
		1156	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1157	}
		1158
		1159	REQ_SEND;
		1160	}
		1161
		1162	void
		1163	aio_readdirx (SV8 *pathname, IV flags, SV *callback=&PL_sv_undef)
		1164	PPCODE:
		1165	{
		1166	dREQ;
		1167
		1168	req->type = EIO_READDIR;
		1169	req->sv1 = newSVsv (pathname);
		1170	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1171	req->int1 = flags | EIO_READDIR_DENTS | EIO_READDIR_CUSTOM1;
		1172
		1173	if (flags & EIO_READDIR_DENTS)
		1174	req->int1 |= EIO_READDIR_CUSTOM2;
		1175
		1176	REQ_SEND;
		1177	}
		1178
		1179	void
846	aio_unlink(pathname,callback=&PL_sv_undef)	1180	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
847	SV * pathname
848	SV * callback
849	ALIAS:	1181	ALIAS:
850	aio_unlink = REQ_UNLINK	1182	aio_unlink = EIO_UNLINK
851	aio_rmdir = REQ_RMDIR	1183	aio_rmdir = EIO_RMDIR
		1184	aio_readdir = EIO_READDIR
852	CODE:	1185	PPCODE:
853	{	1186	{
854	dREQ;	1187	dREQ;
855		1188
856	req->type = ix;	1189	req->type = ix;
857	req->data = newSVsv (pathname);	1190	req->sv1 = newSVsv (pathname);
858	req->dataptr = SvPVbyte_nolen (req->data);	1191	req->ptr1 = SvPVbyte_nolen (req->sv1);
859
860	send_req (req);
861	}
862		1192
		1193	REQ_SEND;
		1194	}
		1195
863	void	1196	void
864	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1197	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
865	SV * oldpath	1198	ALIAS:
866	SV * newpath	1199	aio_link = EIO_LINK
867	SV * callback	1200	aio_symlink = EIO_SYMLINK
		1201	aio_rename = EIO_RENAME
868	CODE:	1202	PPCODE:
869	{	1203	{
870	dREQ;	1204	dREQ;
871		1205
872	req->type = REQ_SYMLINK;	1206	req->type = ix;
873	req->fh = newSVsv (oldpath);	1207	req->sv1 = newSVsv (oldpath);
874	req->data2ptr = SvPVbyte_nolen (req->fh);	1208	req->ptr1 = SvPVbyte_nolen (req->sv1);
875	req->data = newSVsv (newpath);	1209	req->sv2 = newSVsv (newpath);
876	req->dataptr = SvPVbyte_nolen (req->data);	1210	req->ptr2 = SvPVbyte_nolen (req->sv2);
877		1211
878	send_req (req);	1212	REQ_SEND;
879	}	1213	}
880		1214
881	void	1215	void
882	flush()	1216	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
883	PROTOTYPE:	1217	PPCODE:
		1218	{
		1219	dREQ;
		1220
		1221	req->type = EIO_MKNOD;
		1222	req->sv1 = newSVsv (pathname);
		1223	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1224	req->int2 = (mode_t)mode;
		1225	req->offs = dev;
		1226
		1227	REQ_SEND;
		1228	}
		1229
		1230	void
		1231	aio_mtouch (SV8 *data, IV offset = 0, SV *length = &PL_sv_undef, int flags = 0, SV *callback=&PL_sv_undef)
		1232	ALIAS:
		1233	aio_mtouch = EIO_MTOUCH
		1234	aio_msync = EIO_MSYNC
		1235	PPCODE:
		1236	{
		1237	STRLEN svlen;
		1238	char *svptr = SvPVbyte (data, svlen);
		1239	UV len = SvUV (length);
		1240
		1241	if (offset < 0)
		1242	offset += svlen;
		1243
		1244	if (offset < 0 || offset > svlen)
		1245	croak ("offset outside of scalar");
		1246
		1247	if (!SvOK (length) || len + offset > svlen)
		1248	len = svlen - offset;
		1249
		1250	{
		1251	dREQ;
		1252
		1253	req->type = ix;
		1254	req->sv2 = SvREFCNT_inc (data);
		1255	req->ptr2 = (char *)svptr + offset;
		1256	req->size = len;
		1257	req->int1 = flags;
		1258
		1259	REQ_SEND;
		1260	}
		1261	}
		1262
		1263	void
		1264	aio_mlock (SV8 *data, IV offset = 0, SV *length = &PL_sv_undef, SV *callback=&PL_sv_undef)
		1265	PPCODE:
		1266	{
		1267	STRLEN svlen;
		1268	char *svptr = SvPVbyte (data, svlen);
		1269	UV len = SvUV (length);
		1270
		1271	if (offset < 0)
		1272	offset += svlen;
		1273
		1274	if (offset < 0 || offset > svlen)
		1275	croak ("offset outside of scalar");
		1276
		1277	if (!SvOK (length) || len + offset > svlen)
		1278	len = svlen - offset;
		1279
		1280	{
		1281	dREQ;
		1282
		1283	req->type = EIO_MLOCK;
		1284	req->sv2 = SvREFCNT_inc (data);
		1285	req->ptr2 = (char *)svptr + offset;
		1286	req->size = len;
		1287
		1288	REQ_SEND;
		1289	}
		1290	}
		1291
		1292	void
		1293	aio_mlockall (IV flags, SV *callback=&PL_sv_undef)
		1294	PPCODE:
		1295	{
		1296	dREQ;
		1297
		1298	req->type = EIO_MLOCKALL;
		1299	req->int1 = flags;
		1300
		1301	REQ_SEND;
		1302	}
		1303
		1304	void
		1305	aio_busy (double delay, SV *callback=&PL_sv_undef)
		1306	PPCODE:
		1307	{
		1308	dREQ;
		1309
		1310	req->type = EIO_BUSY;
		1311	req->nv1 = delay < 0. ? 0. : delay;
		1312
		1313	REQ_SEND;
		1314	}
		1315
		1316	void
		1317	aio_group (SV *callback=&PL_sv_undef)
		1318	PPCODE:
		1319	{
		1320	dREQ;
		1321
		1322	req->type = EIO_GROUP;
		1323
		1324	req_submit (req);
		1325	XPUSHs (req_sv (req, aio_grp_stash));
		1326	}
		1327
		1328	void
		1329	aio_nop (SV *callback=&PL_sv_undef)
		1330	ALIAS:
		1331	aio_nop = EIO_NOP
		1332	aio_sync = EIO_SYNC
		1333	PPCODE:
		1334	{
		1335	dREQ;
		1336
		1337	req->type = ix;
		1338
		1339	REQ_SEND;
		1340	}
		1341
		1342	int
		1343	aioreq_pri (int pri = 0)
884	CODE:	1344	CODE:
		1345	RETVAL = next_pri;
		1346	if (items > 0)
		1347	{
		1348	if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
		1349	if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
		1350	next_pri = pri;
		1351	}
		1352	OUTPUT:
		1353	RETVAL
		1354
		1355	void
		1356	aioreq_nice (int nice = 0)
		1357	CODE:
		1358	nice = next_pri - nice;
		1359	if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
		1360	if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
		1361	next_pri = nice;
		1362
		1363	void
		1364	flush ()
		1365	CODE:
885	while (nreqs)	1366	while (eio_nreqs ())
886	{	1367	{
887	poll_wait ();	1368	poll_wait ();
888	poll_cb ();	1369	poll_cb ();
889	}	1370	}
890		1371
891	void	1372	int
892	poll()	1373	poll ()
893	PROTOTYPE:
894	CODE:	1374	CODE:
895	if (nreqs)
896	{
897	poll_wait ();	1375	poll_wait ();
898	poll_cb ();	1376	RETVAL = poll_cb ();
899	}
900
901	int
902	poll_fileno()
903	PROTOTYPE:
904	CODE:
905	RETVAL = respipe [0];
906	OUTPUT:	1377	OUTPUT:
907	RETVAL	1378	RETVAL
908		1379
909	int	1380	int
		1381	poll_fileno ()
		1382	CODE:
		1383	RETVAL = s_epipe_fd (&respipe);
		1384	OUTPUT:
		1385	RETVAL
		1386
		1387	int
910	poll_cb(...)	1388	poll_cb (...)
911	PROTOTYPE:	1389	PROTOTYPE:
912	CODE:	1390	CODE:
913	RETVAL = poll_cb ();	1391	RETVAL = poll_cb ();
914	OUTPUT:	1392	OUTPUT:
915	RETVAL	1393	RETVAL
916		1394
917	void	1395	void
918	poll_wait()	1396	poll_wait ()
919	PROTOTYPE:
920	CODE:	1397	CODE:
921	if (nreqs)
922	poll_wait ();	1398	poll_wait ();
923		1399
924	int	1400	int
925	nreqs()	1401	nreqs ()
926	PROTOTYPE:
927	CODE:	1402	CODE:
928	RETVAL = nreqs;	1403	RETVAL = eio_nreqs ();
929	OUTPUT:	1404	OUTPUT:
930	RETVAL	1405	RETVAL
931		1406
		1407	int
		1408	nready ()
		1409	CODE:
		1410	RETVAL = eio_nready ();
		1411	OUTPUT:
		1412	RETVAL
		1413
		1414	int
		1415	npending ()
		1416	CODE:
		1417	RETVAL = eio_npending ();
		1418	OUTPUT:
		1419	RETVAL
		1420
		1421	int
		1422	nthreads ()
		1423	CODE:
		1424	RETVAL = eio_nthreads ();
		1425	OUTPUT:
		1426	RETVAL
		1427
		1428	int
		1429	fadvise (aio_rfd fh, off_t offset, off_t length, IV advice)
		1430	CODE:
		1431	RETVAL = posix_fadvise (fh, offset, length, advice);
		1432	OUTPUT:
		1433	RETVAL
		1434
		1435	ssize_t
		1436	sendfile (aio_wfd ofh, aio_rfd ifh, off_t offset, size_t count)
		1437	CODE:
		1438	RETVAL = eio_sendfile_sync (ofh, ifh, offset, count);
		1439	OUTPUT:
		1440	RETVAL
		1441
		1442	void
		1443	mmap (SV *scalar, size_t length, int prot, int flags, SV *fh, off_t offset = 0)
		1444	PPCODE:
		1445	sv_unmagic (scalar, MMAP_MAGIC);
		1446	{
		1447	int fd = SvOK (fh) ? s_fileno_croak (fh, flags & PROT_WRITE) : -1;
		1448	void *addr = (void *)mmap (0, length, prot, flags, fd, offset);
		1449	if (addr == (void *)-1)
		1450	XSRETURN_NO;
		1451
		1452	sv_force_normal (scalar);
		1453
		1454	/* we store the length in mg_obj, as namlen is I32 :/ */
		1455	sv_magicext (scalar, 0, MMAP_MAGIC, &mmap_vtbl, (char *)addr, 0)
		1456	->mg_obj = (SV *)length;
		1457
		1458	SvUPGRADE (scalar, SVt_PV); /* nop... */
		1459
		1460	if (!(prot & PROT_WRITE))
		1461	SvREADONLY_on (scalar);
		1462
		1463	if (SvLEN (scalar))
		1464	Safefree (SvPVX (scalar));
		1465
		1466	SvPVX (scalar) = (char *)addr;
		1467	SvCUR_set (scalar, length);
		1468	SvLEN_set (scalar, 0);
		1469	SvPOK_only (scalar);
		1470
		1471	XSRETURN_YES;
		1472	}
		1473
		1474	void
		1475	munmap (SV *scalar)
		1476	CODE:
		1477	sv_unmagic (scalar, MMAP_MAGIC);
		1478
		1479	int
		1480	madvise (SV *scalar, off_t offset = 0, SV *length = &PL_sv_undef, IV advice_or_prot)
		1481	ALIAS:
		1482	mprotect = 1
		1483	CODE:
		1484	{
		1485	STRLEN svlen;
		1486	void *addr = SvPVbyte (scalar, svlen);
		1487	size_t len = SvUV (length);
		1488
		1489	if (offset < 0)
		1490	offset += svlen;
		1491
		1492	if (offset < 0 || offset > svlen)
		1493	croak ("offset outside of scalar");
		1494
		1495	if (!SvOK (length) || len + offset > svlen)
		1496	len = svlen - offset;
		1497
		1498	addr = (void *)(((intptr_t)addr) + offset);
		1499	eio_page_align (&addr, &len);
		1500
		1501	switch (ix)
		1502	{
		1503	case 0: RETVAL = posix_madvise (addr, len, advice_or_prot); break;
		1504	case 1: RETVAL = mprotect (addr, len, advice_or_prot); break;
		1505	}
		1506	}
		1507	OUTPUT:
		1508	RETVAL
		1509
		1510	int
		1511	munlock (SV *scalar, off_t offset = 0, SV *length = &PL_sv_undef)
		1512	CODE:
		1513	{
		1514	STRLEN svlen;
		1515	void *addr = SvPVbyte (scalar, svlen);
		1516	size_t len = SvUV (length);
		1517
		1518	if (offset < 0)
		1519	offset += svlen;
		1520
		1521	if (offset < 0 || offset > svlen)
		1522	croak ("offset outside of scalar");
		1523
		1524	if (!SvOK (length) || len + offset > svlen)
		1525	len = svlen - offset;
		1526
		1527	addr = (void *)(((intptr_t)addr) + offset);
		1528	eio_page_align (&addr, &len);
		1529	#if _POSIX_MEMLOCK_RANGE
		1530	RETVAL = munlock (addr, len);
		1531	#else
		1532	RETVAL = ((errno = ENOSYS), -1);
		1533	#endif
		1534	}
		1535	OUTPUT:
		1536	RETVAL
		1537
		1538	int
		1539	munlockall ()
		1540	CODE:
		1541	#if _POSIX_MEMLOCK
		1542	munlockall ();
		1543	#else
		1544	RETVAL = -1;
		1545	errno = ENOSYS;
		1546	#endif
		1547	OUTPUT:
		1548	RETVAL
		1549
		1550	void _on_next_submit (SV *cb)
		1551	CODE:
		1552	SvREFCNT_dec (on_next_submit);
		1553	on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
		1554
		1555	PROTOTYPES: DISABLE
		1556
		1557	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1558
		1559	void
		1560	cancel (aio_req_ornot req)
		1561	CODE:
		1562	eio_cancel (req);
		1563
		1564	void
		1565	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1566	PPCODE:
		1567	{
		1568	if (GIMME_V != G_VOID)
		1569	XPUSHs (req->callback ? sv_2mortal (newRV_inc (req->callback)) : &PL_sv_undef);
		1570
		1571	if (items > 1)
		1572	{
		1573	SV *cb_cv =get_cb (callback);
		1574
		1575	SvREFCNT_dec (req->callback);
		1576	req->callback = SvREFCNT_inc (cb_cv);
		1577	}
		1578	}
		1579
		1580	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1581
		1582	void
		1583	add (aio_req grp, ...)
		1584	PPCODE:
		1585	{
		1586	int i;
		1587
		1588	if (grp->int1 == 2)
		1589	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1590
		1591	for (i = 1; i < items; ++i )
		1592	{
		1593	aio_req req;
		1594
		1595	if (GIMME_V != G_VOID)
		1596	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1597
		1598	req = SvAIO_REQ (ST (i));
		1599
		1600	if (req)
		1601	eio_grp_add (grp, req);
		1602	}
		1603	}
		1604
		1605	void
		1606	cancel_subs (aio_req_ornot req)
		1607	CODE:
		1608	req_cancel_subs (req);
		1609
		1610	void
		1611	result (aio_req grp, ...)
		1612	CODE:
		1613	{
		1614	int i;
		1615	AV *av;
		1616
		1617	grp->errorno = errno;
		1618
		1619	av = newAV ();
		1620	av_extend (av, items - 1);
		1621
		1622	for (i = 1; i < items; ++i )
		1623	av_push (av, newSVsv (ST (i)));
		1624
		1625	SvREFCNT_dec (grp->sv1);
		1626	grp->sv1 = (SV *)av;
		1627	}
		1628
		1629	void
		1630	errno (aio_req grp, int errorno = errno)
		1631	CODE:
		1632	grp->errorno = errorno;
		1633
		1634	void
		1635	limit (aio_req grp, int limit)
		1636	CODE:
		1637	eio_grp_limit (grp, limit);
		1638
		1639	void
		1640	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1641	CODE:
		1642	{
		1643	SvREFCNT_dec (grp->sv2);
		1644	grp->sv2 = newSVsv (callback);
		1645	grp->feed = aio_grp_feed;
		1646
		1647	if (grp->int2 <= 0)
		1648	grp->int2 = 2;
		1649
		1650	eio_grp_limit (grp, grp->int2);
		1651	}
		1652

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