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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.39 by root, Mon Feb 6 23:54:12 2006 UTC vs.
Revision 1.165 by root, Sun May 9 20:42:55 2010 UTC

1	#define _REENTRANT 1	1	#include "libeio/xthread.h"
		2
2	#include <errno.h>	3	#include <errno.h>
3		4
4	#include "EXTERN.h"	5	#include "EXTERN.h"
5	#include "perl.h"	6	#include "perl.h"
6	#include "XSUB.h"	7	#include "XSUB.h"
7		8
8	#include "autoconf/config.h"	9	#include "schmorp.h"
9
10	#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>
		16	#include <sys/statvfs.h>
15	#include <limits.h>	17	#include <limits.h>
16	#include <unistd.h>
17	#include <fcntl.h>	18	#include <fcntl.h>
18	#include <signal.h>
19	#include <sched.h>	19	#include <sched.h>
20		20
21	#if HAVE_SENDFILE	21	#if _POSIX_MEMLOCK || _POSIX_MAPPED_FILES
22	# if __linux
23	# include <sys/sendfile.h>	22	# include <sys/mman.h>
24	# elif __freebsd	23	#endif
25	# 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
26	# include <sys/uio.h>	68	# include <sys/time.h>
27	# elif __hpux
28	# include <sys/socket.h>
29	# elif __solaris /* not yet */
30	# 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/eio.h"
		124
		125	#ifndef POSIX_FADV_NORMAL
		126	# define POSIX_FADV_NORMAL 0
		127	# define NO_FADVISE 1
		128	#endif
		129	#ifndef POSIX_FADV_SEQUENTIAL
		130	# define POSIX_FADV_SEQUENTIAL 0
		131	#endif
		132	#ifndef POSIX_FADV_RANDOM
		133	# define POSIX_FADV_RANDOM 0
		134	#endif
		135	#ifndef POSIX_FADV_NOREUSE
		136	# define POSIX_FADV_NOREUSE 0
		137	#endif
		138	#ifndef POSIX_FADV_WILLNEED
		139	# define POSIX_FADV_WILLNEED 0
		140	#endif
		141	#ifndef POSIX_FADV_DONTNEED
		142	# define POSIX_FADV_DONTNEED 0
		143	#endif
		144
		145	#ifndef ST_NODEV
		146	# define ST_NODEV 0
		147	#endif
		148	#ifndef ST_NOEXEC
		149	# define ST_NOEXEC 0
		150	#endif
		151	#ifndef ST_SYNCHRONOUS
		152	# define ST_SYNCHRONOUS 0
		153	#endif
		154	#ifndef ST_MANDLOCK
		155	# define ST_MANDLOCK 0
		156	#endif
		157	#ifndef ST_WRITE
		158	# define ST_WRITE 0
		159	#endif
		160	#ifndef ST_APPEND
		161	# define ST_APPEND 0
		162	#endif
		163	#ifndef ST_IMMUTABLE
		164	# define ST_IMMUTABLE 0
		165	#endif
		166	#ifndef ST_NOATIME
		167	# define ST_NOATIME 0
		168	#endif
		169	#ifndef ST_NODIRATIME
		170	# define ST_NODIRATIME 0
		171	#endif
		172	#ifndef ST_RELATIME
		173	# define ST_RELATIME 0
		174	#endif
		175
		176	#ifndef MCL_CURRENT
		177	# define MCL_CURRENT 0
		178	#endif
		179	#ifndef MCL_FUTURE
		180	# define MCL_FUTURE 0
		181	#endif
		182
		183	#ifndef MAP_ANONYMOUS
		184	# ifdef MAP_ANON
		185	# define MAP_ANONYMOUS MAP_ANON
31	# else	186	# else
32	# error sendfile support requested but not available	187	# define MAP_ANONYMOUS MAP_FIXED /* and hope this fails */
33	# endif	188	# endif
34	#endif	189	#endif
35		190	#ifndef MAP_HUGETLB
36	/* used for struct dirent, AIX doesn't provide it */	191	# define MAP_HUGETLB 0
37	#ifndef NAME_MAX
38	# define NAME_MAX 4096
39	#endif	192	#endif
40		193	#ifndef MAP_LOCKED
41	#if __ia64	194	# define MAP_LOCKED 0
42	# define STACKSIZE 65536
43	#else
44	# define STACKSIZE 8192
45	#endif	195	#endif
		196	#ifndef MAP_NORESERVE
		197	# define MAP_NORESERVE 0
		198	#endif
		199	#ifndef MAP_POPULATE
		200	# define MAP_POPULATE 0
		201	#endif
		202	#ifndef MAP_NONBLOCK
		203	# define MAP_NONBLOCK 0
		204	#endif
		205
		206	#ifndef PAGESIZE
		207	# define PAGESIZE sysconf (_SC_PAGESIZE)
		208	#endif
		209
		210	static int req_invoke (eio_req *req);
		211	#define EIO_FINISH(req) req_invoke (req)
		212	static void req_destroy (eio_req *grp);
		213	#define EIO_DESTROY(req) req_destroy (req)
46		214
47	enum {	215	enum {
48	REQ_QUIT,	216	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
49	REQ_OPEN, REQ_CLOSE,
50	REQ_READ, REQ_WRITE, REQ_READAHEAD,
51	REQ_SENDFILE,
52	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
53	REQ_FSYNC, REQ_FDATASYNC,
54	REQ_UNLINK, REQ_RMDIR,
55	REQ_READDIR,
56	REQ_SYMLINK,
57	};	217	};
58		218
59	typedef struct aio_cb {	219	#include "libeio/eio.c"
60	struct aio_cb *volatile next;
61		220
62	int type;
63
64	/* should receive a cleanup, with unions */
65	int fd, fd2;
66	off_t offset;
67	size_t length;
68	ssize_t result;
69	mode_t mode; /* open */
70	int errorno;
71	SV *data, *callback;
72	SV *fh, *fh2;
73	void *dataptr, *data2ptr;
74	STRLEN dataoffset;
75
76	Stat_t *statdata;
77	} aio_cb;
78
79	typedef aio_cb *aio_req;	221	typedef eio_req *aio_req;
		222	typedef eio_req *aio_req_ornot;
80		223
81	static int started, wanted;	224	static SV *on_next_submit;
82	static volatile int nreqs;	225	static int next_pri = EIO_PRI_DEFAULT;
83	static int max_outstanding = 1<<30;	226	static int max_outstanding;
84	static int respipe [2];
85		227
86	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	228	static s_epipe respipe;
87	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
88	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
89		229
90	static volatile aio_req reqs, reqe; /* queue start, queue end */	230	static void req_destroy (aio_req req);
91	static volatile aio_req ress, rese; /* queue start, queue end */
92
93	static void free_req (aio_req req)	231	static void req_cancel (aio_req req);
94	{
95	if (req->data)
96	SvREFCNT_dec (req->data);
97		232
		233	static void want_poll (void)
		234	{
		235	/* write a dummy byte to the pipe so fh becomes ready */
		236	s_epipe_signal (&respipe);
		237	}
		238
		239	static void done_poll (void)
		240	{
		241	/* read any signals sent by the worker threads */
		242	s_epipe_drain (&respipe);
		243	}
		244
		245	/* must be called at most once */
		246	static SV *req_sv (aio_req req, HV *stash)
		247	{
98	if (req->fh)	248	if (!req->self)
99	SvREFCNT_dec (req->fh);
100
101	if (req->fh2)
102	SvREFCNT_dec (req->fh2);
103
104	if (req->statdata)
105	Safefree (req->statdata);
106
107	if (req->callback)
108	SvREFCNT_dec (req->callback);
109
110	if (req->type == REQ_READDIR && req->result >= 0)
111	free (req->data2ptr);
112
113	Safefree (req);
114	}
115
116	static void
117	poll_wait ()
118	{
119	if (nreqs && !ress)
120	{	249	{
121	fd_set rfd;	250	req->self = (SV *)newHV ();
122	FD_ZERO(&rfd);	251	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
123	FD_SET(respipe [0], &rfd);
124
125	select (respipe [0] + 1, &rfd, 0, 0, 0);
126	}	252	}
127	}
128		253
129	static int	254	return sv_2mortal (sv_bless (newRV_inc (req->self), stash));
130	poll_cb ()	255	}
		256
		257	static aio_req SvAIO_REQ (SV *sv)
		258	{
		259	MAGIC *mg;
		260
		261	if (!SvROK (sv)
		262	|| (SvSTASH (SvRV (sv)) != aio_grp_stash
		263	&& SvSTASH (SvRV (sv)) != aio_req_stash
		264	&& !sv_derived_from (sv, "IO::AIO::REQ")))
		265	croak ("object of class IO::AIO::REQ expected");
		266
		267	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		268
		269	return mg ? (aio_req)mg->mg_ptr : 0;
		270	}
		271
		272	static void aio_grp_feed (aio_req grp)
		273	{
		274	if (grp->sv2 && SvOK (grp->sv2))
		275	{
		276	dSP;
		277
		278	ENTER;
		279	SAVETMPS;
		280	PUSHMARK (SP);
		281	XPUSHs (req_sv (grp, aio_grp_stash));
		282	PUTBACK;
		283	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		284	SPAGAIN;
		285	FREETMPS;
		286	LEAVE;
		287	}
		288	}
		289
		290	static void req_submit (eio_req *req)
		291	{
		292	eio_submit (req);
		293
		294	if (expect_false (on_next_submit))
		295	{
		296	dSP;
		297	SV *cb = sv_2mortal (on_next_submit);
		298
		299	on_next_submit = 0;
		300
		301	PUSHMARK (SP);
		302	PUTBACK;
		303	call_sv (cb, G_DISCARD | G_EVAL);
		304	}
		305	}
		306
		307	static int req_invoke (eio_req *req)
131	{	308	{
132	dSP;	309	dSP;
133	int count = 0;
134	int do_croak = 0;
135	aio_req req;
136		310
137	for (;;)	311	if (req->flags & FLAG_SV2_RO_OFF)
		312	SvREADONLY_off (req->sv2);
		313
		314	if (!EIO_CANCELLED (req) && req->callback)
138	{	315	{
139	pthread_mutex_lock (&reslock);	316	static SV *sv_result_cache; /* caches the result integer SV */
140	req = ress;	317	SV *sv_result;
141		318
142	if (req)	319	ENTER;
		320	SAVETMPS;
		321	PUSHMARK (SP);
		322	EXTEND (SP, 1);
		323
		324	/* do not recreate the result IV from scratch each time */
		325	if (expect_true (sv_result_cache))
143	{	326	{
144	ress = req->next;	327	sv_result = sv_result_cache; sv_result_cache = 0;
145		328	SvIV_set (sv_result, req->result);
146	if (!ress)
147	{
148	/* read any signals sent by the worker threads */
149	char buf [32];
150	while (read (respipe [0], buf, 32) == 32)
151	;
152
153	rese = 0;
154	}
155	}
156
157	pthread_mutex_unlock (&reslock);
158
159	if (!req)
160	break;
161
162	nreqs--;
163
164	if (req->type == REQ_QUIT)
165	started--;
166	else
167	{
168	int errorno = errno;
169	errno = req->errorno;
170
171	if (req->type == REQ_READ)
172	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
173
174	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
175	SvREADONLY_off (req->data);
176
177	if (req->statdata)
178	{
179	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
180	PL_laststatval = req->result;
181	PL_statcache = *(req->statdata);
182	}
183
184	ENTER;
185	PUSHMARK (SP);
186
187	if (req->type == REQ_READDIR)
188	{
189	SV *rv = &PL_sv_undef;
190
191	if (req->result >= 0)
192	{
193	char *buf = req->data2ptr;
194	AV *av = newAV ();
195
196	while (req->result)
197	{
198	SV *sv = newSVpv (buf, 0);
199
200	av_push (av, sv);
201	buf += SvCUR (sv) + 1;
202	req->result--;
203	}
204
205	rv = sv_2mortal (newRV_noinc ((SV *)av));
206	}
207
208	XPUSHs (rv);
209	}
210	else
211	{
212	XPUSHs (sv_2mortal (newSViv (req->result)));
213
214	if (req->type == REQ_OPEN)
215	{
216	/* convert fd to fh */
217	SV *fh;
218
219	PUTBACK;
220	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
221	SPAGAIN;
222
223	fh = SvREFCNT_inc (POPs);
224
225	PUSHMARK (SP);
226	XPUSHs (sv_2mortal (fh));
227	}
228	}
229
230	if (SvOK (req->callback))
231	{
232	PUTBACK;
233	call_sv (req->callback, G_VOID | G_EVAL);
234	SPAGAIN;
235
236	if (SvTRUE (ERRSV))
237	{
238	free_req (req);
239	croak (0);
240	}
241	}
242
243	LEAVE;
244
245	errno = errorno;
246	count++;
247	}
248
249	free_req (req);
250	}
251
252	return count;
253	}
254
255	static void *aio_proc(void *arg);
256
257	static void
258	start_thread (void)
259	{
260	sigset_t fullsigset, oldsigset;
261	pthread_t tid;
262	pthread_attr_t attr;
263
264	pthread_attr_init (&attr);
265	pthread_attr_setstacksize (&attr, STACKSIZE);
266	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
267
268	sigfillset (&fullsigset);
269	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
270
271	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
272	started++;
273
274	sigprocmask (SIG_SETMASK, &oldsigset, 0);
275	}
276
277	static void
278	send_req (aio_req req)
279	{
280	while (started < wanted && nreqs >= started)
281	start_thread ();
282
283	nreqs++;
284
285	pthread_mutex_lock (&reqlock);
286
287	req->next = 0;
288
289	if (reqe)
290	{
291	reqe->next = req;
292	reqe = req;
293	}
294	else
295	reqe = reqs = req;
296
297	pthread_cond_signal (&reqwait);
298	pthread_mutex_unlock (&reqlock);
299
300	if (nreqs > max_outstanding)
301	for (;;)
302	{
303	poll_cb ();
304
305	if (nreqs <= max_outstanding)
306	break;
307
308	poll_wait ();
309	}
310	}
311
312	static void
313	end_thread (void)
314	{
315	aio_req req;
316	Newz (0, req, 1, aio_cb);
317	req->type = REQ_QUIT;
318
319	send_req (req);
320	}
321
322	static void min_parallel (int nthreads)
323	{
324	if (wanted < nthreads)
325	wanted = nthreads;
326	}
327
328	static void max_parallel (int nthreads)
329	{
330	int cur = started;
331
332	if (wanted > nthreads)
333	wanted = nthreads;
334
335	while (cur > wanted)
336	{
337	end_thread ();
338	cur--;
339	}
340
341	while (started > wanted)
342	{
343	poll_wait ();
344	poll_cb ();
345	}
346	}
347
348	static void create_pipe ()
349	{
350	if (pipe (respipe))
351	croak ("unable to initialize result pipe");
352
353	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
354	croak ("cannot set result pipe to nonblocking mode");
355
356	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
357	croak ("cannot set result pipe to nonblocking mode");
358	}
359
360	/*****************************************************************************/
361	/* work around various missing functions */
362
363	#if !HAVE_PREADWRITE
364	# define pread aio_pread
365	# define pwrite aio_pwrite
366
367	/*
368	* make our pread/pwrite safe against themselves, but not against
369	* normal read/write by using a mutex. slows down execution a lot,
370	* but that's your problem, not mine.
371	*/
372	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
373
374	static ssize_t
375	pread (int fd, void *buf, size_t count, off_t offset)
376	{
377	ssize_t res;
378	off_t ooffset;
379
380	pthread_mutex_lock (&preadwritelock);
381	ooffset = lseek (fd, 0, SEEK_CUR);
382	lseek (fd, offset, SEEK_SET);
383	res = read (fd, buf, count);
384	lseek (fd, ooffset, SEEK_SET);
385	pthread_mutex_unlock (&preadwritelock);
386
387	return res;
388	}
389
390	static ssize_t
391	pwrite (int fd, void *buf, size_t count, off_t offset)
392	{
393	ssize_t res;
394	off_t ooffset;
395
396	pthread_mutex_lock (&preadwritelock);
397	ooffset = lseek (fd, 0, SEEK_CUR);
398	lseek (fd, offset, SEEK_SET);
399	res = write (fd, buf, count);
400	lseek (fd, offset, SEEK_SET);
401	pthread_mutex_unlock (&preadwritelock);
402
403	return res;
404	}
405	#endif
406
407	#if !HAVE_FDATASYNC
408	# define fdatasync fsync
409	#endif
410
411	#if !HAVE_READAHEAD
412	# define readahead aio_readahead
413
414	static ssize_t
415	readahead (int fd, off_t offset, size_t count)
416	{
417	char readahead_buf[4096];
418
419	while (count > 0)
420	{
421	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
422
423	pread (fd, readahead_buf, len, offset);
424	offset += len;
425	count -= len;
426	}
427
428	errno = 0;
429	}
430	#endif
431
432	#if !HAVE_READDIR_R
433	# define readdir_r aio_readdir_r
434
435	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
436
437	static int
438	readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
439	{
440	struct dirent *e;
441	int errorno;
442
443	pthread_mutex_lock (&readdirlock);
444
445	e = readdir (dirp);
446	errorno = errno;
447
448	if (e)
449	{
450	*res = ent;
451	strcpy (ent->d_name, e->d_name);
452	}
453	else
454	*res = 0;
455
456	pthread_mutex_unlock (&readdirlock);
457
458	errno = errorno;
459	return e ? 0 : -1;
460	}
461	#endif
462
463	/* sendfile always needs emulation */
464	static ssize_t
465	sendfile_ (int ofd, int ifd, off_t offset, size_t count)
466	{
467	ssize_t res;
468
469	if (!count)
470	return 0;
471
472	#if HAVE_SENDFILE
473	# if __linux
474	res = sendfile (ofd, ifd, &offset, count);
475
476	# elif __freebsd
477	/*
478	* Of course, the freebsd sendfile is a dire hack with no thoughts
479	* wasted on making it similar to other I/O functions.
480	*/
481	{
482	off_t sbytes;
483	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
484
485	if (res < 0 && sbytes)
486	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
487	res = sbytes;
488	}
489
490	# elif __hpux
491	res = sendfile (ofd, ifd, offset, count, 0, 0);
492
493	# elif __solaris
494	{
495	struct sendfilevec vec;
496	size_t sbytes;
497
498	vec.sfv_fd = ifd;
499	vec.sfv_flag = 0;
500	vec.sfv_off = offset;
501	vec.sfv_len = count;
502
503	res = sendfilev (ofd, &vec, 1, &sbytes);
504
505	if (res < 0 && sbytes)
506	res = sbytes;
507	}
508
509	# endif
510	#else
511	res = -1;
512	errno = ENOSYS;
513	#endif
514
515	if (res < 0
516	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
517	#if __solaris
518	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
519	#endif
520	)
521	)
522	{
523	/* emulate sendfile. this is a major pain in the ass */
524	char buf[4096];
525	res = 0;
526
527	while (count)
528	{
529	ssize_t cnt;
530
531	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
532
533	if (cnt <= 0)
534	{
535	if (cnt && !res) res = -1;
536	break;
537	}
538
539	cnt = write (ofd, buf, cnt);
540
541	if (cnt <= 0)
542	{
543	if (cnt && !res) res = -1;
544	break;
545	}
546
547	offset += cnt;
548	res += cnt;
549	count -= cnt;
550	}
551	}
552
553	return res;
554	}
555
556	/* read a full directory */
557	static int
558	scandir_ (const char *path, void **namesp)
559	{
560	DIR *dirp = opendir (path);
561	union
562	{
563	struct dirent d;
564	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
565	} u;
566	struct dirent *entp;
567	char *name, *names;
568	int memlen = 4096;
569	int memofs = 0;
570	int res = 0;
571	int errorno;
572
573	if (!dirp)
574	return -1;
575
576	names = malloc (memlen);
577
578	for (;;)
579	{
580	errno = 0, readdir_r (dirp, &u.d, &entp);
581
582	if (!entp)
583	break;
584
585	name = entp->d_name;
586
587	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
588	{
589	int len = strlen (name) + 1;
590
591	res++;
592
593	while (memofs + len > memlen)
594	{
595	memlen *= 2;
596	names = realloc (names, memlen);
597	if (!names)
598	break;
599	}
600
601	memcpy (names + memofs, name, len);
602	memofs += len;
603	}
604	}
605
606	errorno = errno;
607	closedir (dirp);
608
609	if (errorno)
610	{
611	free (names);
612	errno = errorno;
613	res = -1;
614	}
615
616	*namesp = (void *)names;
617	return res;
618	}
619
620	/*****************************************************************************/
621
622	static void *
623	aio_proc (void *thr_arg)
624	{
625	aio_req req;
626	int type;
627
628	do
629	{
630	pthread_mutex_lock (&reqlock);
631
632	for (;;)
633	{
634	req = reqs;
635
636	if (reqs)
637	{
638	reqs = reqs->next;
639	if (!reqs) reqe = 0;
640	}
641
642	if (req)
643	break;
644
645	pthread_cond_wait (&reqwait, &reqlock);
646	}
647
648	pthread_mutex_unlock (&reqlock);
649
650	errno = 0; /* strictly unnecessary */
651
652	type = req->type;
653
654	switch (type)
655	{
656	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
657	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
658
659	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
660	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
661
662	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
663	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
664	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
665
666	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
667	case REQ_CLOSE: req->result = close (req->fd); break;
668	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
669	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
670	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
671
672	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
673	case REQ_FSYNC: req->result = fsync (req->fd); break;
674	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
675
676	case REQ_QUIT:
677	break;
678
679	default:
680	req->result = ENOSYS;
681	break;
682	}
683
684	req->errorno = errno;
685
686	pthread_mutex_lock (&reslock);
687
688	req->next = 0;
689
690	if (rese)
691	{
692	rese->next = req;
693	rese = req;
694	}	329	}
695	else	330	else
696	{	331	{
697	rese = ress = req;	332	sv_result = newSViv (req->result);
698		333	SvREADONLY_on (sv_result);
699	/* write a dummy byte to the pipe so fh becomes ready */
700	write (respipe [1], &respipe, 1);
701	}	334	}
702		335
703	pthread_mutex_unlock (&reslock);	336	switch (req->type)
		337	{
		338	case EIO_READDIR:
		339	{
		340	SV *rv = &PL_sv_undef;
		341
		342	if (req->result >= 0)
		343	{
		344	int i;
		345	char *names = (char *)req->ptr2;
		346	eio_dirent *ent = (eio_dirent *)req->ptr1; /* might be 0 */
		347	AV *av = newAV ();
		348
		349	av_extend (av, req->result - 1);
		350
		351	for (i = 0; i < req->result; ++i)
		352	{
		353	if (req->int1 & EIO_READDIR_DENTS)
		354	{
		355	SV *namesv = newSVpvn (names + ent->nameofs, ent->namelen);
		356
		357	if (req->int1 & EIO_READDIR_CUSTOM2)
		358	{
		359	static SV *sv_type [EIO_DT_MAX + 1]; /* type sv cache */
		360	AV *avent = newAV ();
		361
		362	av_extend (avent, 2);
		363
		364	if (!sv_type [ent->type])
		365	{
		366	sv_type [ent->type] = newSViv (ent->type);
		367	SvREADONLY_on (sv_type [ent->type]);
		368	}
		369
		370	av_store (avent, 0, namesv);
		371	av_store (avent, 1, SvREFCNT_inc (sv_type [ent->type]));
		372	av_store (avent, 2, IVSIZE >= 8 ? newSVuv (ent->inode) : newSVnv (ent->inode));
		373
		374	av_store (av, i, newRV_noinc ((SV *)avent));
		375	}
		376	else
		377	av_store (av, i, namesv);
		378
		379	++ent;
		380	}
		381	else
		382	{
		383	SV *name = newSVpv (names, 0);
		384	av_store (av, i, name);
		385	names += SvCUR (name) + 1;
		386	}
		387	}
		388
		389	rv = sv_2mortal (newRV_noinc ((SV *)av));
		390	}
		391
		392	PUSHs (rv);
		393
		394	if (req->int1 & EIO_READDIR_CUSTOM1)
		395	XPUSHs (sv_2mortal (newSViv (req->int1 & ~(EIO_READDIR_CUSTOM1 | EIO_READDIR_CUSTOM2))));
		396	}
		397	break;
		398
		399	case EIO_OPEN:
		400	{
		401	/* convert fd to fh */
		402	SV *fh = &PL_sv_undef;
		403
		404	if (req->result >= 0)
		405	{
		406	GV *gv = (GV *)sv_newmortal ();
		407	int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
		408	char sym [64];
		409	int symlen;
		410
		411	symlen = snprintf (sym, sizeof (sym), "fd#%d", (int)req->result);
		412	gv_init (gv, aio_stash, sym, symlen, 0);
		413
		414	symlen = snprintf (
		415	sym,
		416	sizeof (sym),
		417	"%s&=%d",
		418	flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
		419	(int)req->result
		420	);
		421
		422	if (do_open (gv, sym, symlen, 0, 0, 0, 0))
		423	fh = (SV *)gv;
		424	}
		425
		426	PUSHs (fh);
		427	}
		428	break;
		429
		430	case EIO_STATVFS:
		431	case EIO_FSTATVFS:
		432	{
		433	SV *rv = &PL_sv_undef;
		434
		435	if (req->result >= 0)
		436	{
		437	EIO_STRUCT_STATVFS *f = EIO_STATVFS_BUF (req);
		438	HV *hv = newHV ();
		439
		440	rv = sv_2mortal (newRV_noinc ((SV *)hv));
		441
		442	hv_store (hv, "bsize" , sizeof ("bsize" ) - 1, newSVval64 (f->f_bsize ), 0);
		443	hv_store (hv, "frsize" , sizeof ("frsize" ) - 1, newSVval64 (f->f_frsize ), 0);
		444	hv_store (hv, "blocks" , sizeof ("blocks" ) - 1, newSVval64 (f->f_blocks ), 0);
		445	hv_store (hv, "bfree" , sizeof ("bfree" ) - 1, newSVval64 (f->f_bfree ), 0);
		446	hv_store (hv, "bavail" , sizeof ("bavail" ) - 1, newSVval64 (f->f_bavail ), 0);
		447	hv_store (hv, "files" , sizeof ("files" ) - 1, newSVval64 (f->f_files ), 0);
		448	hv_store (hv, "ffree" , sizeof ("ffree" ) - 1, newSVval64 (f->f_ffree ), 0);
		449	hv_store (hv, "favail" , sizeof ("favail" ) - 1, newSVval64 (f->f_favail ), 0);
		450	hv_store (hv, "fsid" , sizeof ("fsid" ) - 1, newSVval64 (f->f_fsid ), 0);
		451	hv_store (hv, "flag" , sizeof ("flag" ) - 1, newSVval64 (f->f_flag ), 0);
		452	hv_store (hv, "namemax", sizeof ("namemax") - 1, newSVval64 (f->f_namemax), 0);
		453	}
		454
		455	PUSHs (rv);
		456	}
		457
		458	break;
		459
		460	case EIO_GROUP:
		461	req->int1 = 2; /* mark group as finished */
		462
		463	if (req->sv1)
		464	{
		465	int i;
		466	AV *av = (AV *)req->sv1;
		467
		468	EXTEND (SP, AvFILL (av) + 1);
		469	for (i = 0; i <= AvFILL (av); ++i)
		470	PUSHs (*av_fetch (av, i, 0));
		471	}
		472	break;
		473
		474	case EIO_NOP:
		475	case EIO_BUSY:
		476	break;
		477
		478	case EIO_READLINK:
		479	if (req->result > 0)
		480	PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
		481	break;
		482
		483	case EIO_STAT:
		484	case EIO_LSTAT:
		485	case EIO_FSTAT:
		486	PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
		487	PL_laststatval = req->result;
		488	PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
		489	PUSHs (sv_result);
		490	break;
		491
		492	case EIO_READ:
		493	{
		494	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		495	*SvEND (req->sv2) = 0;
		496	SvPOK_only (req->sv2);
		497	SvSETMAGIC (req->sv2);
		498	PUSHs (sv_result);
		499	}
		500	break;
		501
		502	case EIO_DUP2:
		503	if (req->result > 0)
		504	SvIV_set (sv_result, 0);
		505	/* FALLTHROUGH */
		506
		507	default:
		508	PUSHs (sv_result);
		509	break;
		510	}
		511
		512	errno = req->errorno;
		513
		514	PUTBACK;
		515	call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
		516	SPAGAIN;
		517
		518	if (expect_false (SvREFCNT (sv_result) != 1 || sv_result_cache))
		519	SvREFCNT_dec (sv_result);
		520	else
		521	sv_result_cache = sv_result;
		522
		523	FREETMPS;
		524	LEAVE;
		525
		526	PUTBACK;
704	}	527	}
705	while (type != REQ_QUIT);	528
		529	return !!SvTRUE (ERRSV);
		530	}
		531
		532	static void req_destroy (aio_req req)
		533	{
		534	if (req->self)
		535	{
		536	sv_unmagic (req->self, PERL_MAGIC_ext);
		537	SvREFCNT_dec (req->self);
		538	}
		539
		540	SvREFCNT_dec (req->sv1);
		541	SvREFCNT_dec (req->sv2);
		542	SvREFCNT_dec (req->callback);
		543
		544	Safefree (req);
		545	}
		546
		547	static void req_cancel_subs (aio_req grp)
		548	{
		549	aio_req sub;
		550
		551	if (grp->type != EIO_GROUP)
		552	return;
		553
		554	SvREFCNT_dec (grp->sv2);
		555	grp->sv2 = 0;
		556
		557	eio_grp_cancel (grp);
		558	}
		559
		560	static void
		561	create_respipe (void)
		562	{
		563	if (s_epipe_renew (&respipe))
		564	croak ("IO::AIO: unable to initialize result pipe");
		565	}
		566
		567	static void poll_wait (void)
		568	{
		569	while (eio_nreqs ())
		570	{
		571	int size;
		572
		573	X_LOCK (reslock);
		574	size = res_queue.size;
		575	X_UNLOCK (reslock);
		576
		577	if (size)
		578	return;
		579
		580	etp_maybe_start_thread ();
		581
		582	s_epipe_wait (&respipe);
		583	}
		584	}
		585
		586	static int poll_cb (void)
		587	{
		588	for (;;)
		589	{
		590	int res = eio_poll ();
		591
		592	if (res > 0)
		593	croak (0);
		594
		595	if (!max_outstanding || max_outstanding > eio_nreqs ())
		596	return res;
		597
		598	poll_wait ();
		599	}
		600	}
		601
		602	static void atfork_child (void)
		603	{
		604	create_respipe ();
		605	}
		606
		607	/*****************************************************************************/
		608
		609	#if !_POSIX_MAPPED_FILES
		610	# define mmap(addr,length,prot,flags,fd,offs) (errno = ENOSYS, -1)
		611	# define munmap(addr,length) (errno = ENOSYS, -1)
		612	#endif
		613
		614	#define MMAP_MAGIC PERL_MAGIC_ext
		615
		616	static int
		617	mmap_free (pTHX_ SV *sv, MAGIC *mg)
		618	{
		619	int old_errno = errno;
		620	munmap (mg->mg_ptr, (size_t)mg->mg_obj);
		621	errno = old_errno;
		622
		623	mg->mg_obj = 0; /* just in case */
		624
		625	SvREADONLY_off (sv);
		626	SvCUR_set (sv, 0);
		627	SvLEN_set (sv, 0);
		628	SvPVX (sv) = 0;
		629	SvOK_off (sv);
706		630
707	return 0;	631	return 0;
708	}	632	}
709		633
		634	static MGVTBL mmap_vtbl = {
		635	0, 0, 0, 0, mmap_free
		636	};
		637
710	/*****************************************************************************/	638	/*****************************************************************************/
711		639
712	static void atfork_prepare (void)	640	static SV *
		641	get_cb (SV *cb_sv)
713	{	642	{
714	pthread_mutex_lock (&reqlock);	643	SvGETMAGIC (cb_sv);
715	pthread_mutex_lock (&reslock);	644	return SvOK (cb_sv) ? s_get_cv_croak (cb_sv) : 0;
716	#if !HAVE_PREADWRITE
717	pthread_mutex_lock (&preadwritelock);
718	#endif
719	#if !HAVE_READDIR_R
720	pthread_mutex_lock (&readdirlock);
721	#endif
722	}
723
724	static void atfork_parent (void)
725	{
726	#if !HAVE_READDIR_R
727	pthread_mutex_unlock (&readdirlock);
728	#endif
729	#if !HAVE_PREADWRITE
730	pthread_mutex_unlock (&preadwritelock);
731	#endif
732	pthread_mutex_unlock (&reslock);
733	pthread_mutex_unlock (&reqlock);
734	}
735
736	static void atfork_child (void)
737	{
738	aio_req prv;
739
740	started = 0;
741
742	while (reqs)
743	{
744	prv = reqs;
745	reqs = prv->next;
746	free_req (prv);
747	}
748
749	reqs = reqe = 0;
750
751	while (ress)
752	{
753	prv = ress;
754	ress = prv->next;
755	free_req (prv);
756	}
757
758	ress = rese = 0;
759
760	close (respipe [0]);
761	close (respipe [1]);
762	create_pipe ();
763
764	atfork_parent ();
765	}	645	}
766		646
767	#define dREQ \	647	#define dREQ \
		648	SV *cb_cv; \
768	aio_req req; \	649	aio_req req; \
		650	int req_pri = next_pri; \
		651	next_pri = EIO_PRI_DEFAULT; \
769	\	652	\
770	if (SvOK (callback) && !SvROK (callback)) \	653	cb_cv = get_cb (callback); \
771	croak ("clalback must be undef or of reference type"); \
772	\	654	\
773	Newz (0, req, 1, aio_cb); \	655	Newz (0, req, 1, eio_req); \
774	if (!req) \	656	if (!req) \
775	croak ("out of memory during aio_req allocation"); \	657	croak ("out of memory during eio_req allocation"); \
776	\	658	\
777	req->callback = newSVsv (callback);	659	req->callback = SvREFCNT_inc (cb_cv); \
778		660	req->pri = req_pri
		661
		662	#define REQ_SEND \
		663	PUTBACK; \
		664	req_submit (req); \
		665	SPAGAIN; \
		666	\
		667	if (GIMME_V != G_VOID) \
		668	XPUSHs (req_sv (req, aio_req_stash));
		669
779	MODULE = IO::AIO PACKAGE = IO::AIO	670	MODULE = IO::AIO PACKAGE = IO::AIO
780		671
781	PROTOTYPES: ENABLE	672	PROTOTYPES: ENABLE
782		673
783	BOOT:	674	BOOT:
784	{	675	{
		676	static const struct {
		677	const char *name;
		678	IV iv;
		679	} *civ, const_iv[] = {
		680	# define const_niv(name, value) { # name, (IV) value },
		681	# define const_iv(name) { # name, (IV) name },
		682	# define const_eio(name) { # name, (IV) EIO_ ## name },
		683	const_iv (EXDEV)
		684	const_iv (ENOSYS)
		685	const_iv (O_RDONLY)
		686	const_iv (O_WRONLY)
		687	const_iv (O_RDWR)
		688	const_iv (O_CREAT)
		689	const_iv (O_TRUNC)
		690	const_iv (O_EXCL)
		691	const_iv (O_APPEND)
		692	#ifndef _WIN32
		693	const_iv (S_IFIFO)
		694	#endif
		695	const_niv (FADV_NORMAL , POSIX_FADV_NORMAL)
		696	const_niv (FADV_SEQUENTIAL, POSIX_FADV_SEQUENTIAL)
		697	const_niv (FADV_RANDOM , POSIX_FADV_RANDOM)
		698	const_niv (FADV_NOREUSE , POSIX_FADV_NOREUSE)
		699	const_niv (FADV_WILLNEED , POSIX_FADV_WILLNEED)
		700	const_niv (FADV_DONTNEED , POSIX_FADV_DONTNEED)
		701
		702	const_iv (ST_RDONLY)
		703	const_iv (ST_NOSUID)
		704	const_iv (ST_NODEV)
		705	const_iv (ST_NOEXEC)
		706	const_iv (ST_SYNCHRONOUS)
		707	const_iv (ST_MANDLOCK)
		708	const_iv (ST_WRITE)
		709	const_iv (ST_APPEND)
		710	const_iv (ST_IMMUTABLE)
		711	const_iv (ST_NOATIME)
		712	const_iv (ST_NODIRATIME)
		713	const_iv (ST_RELATIME)
		714
		715	const_iv (PROT_EXEC)
		716	const_iv (PROT_NONE)
		717	const_iv (PROT_READ)
		718	const_iv (PROT_WRITE)
		719
		720	/*const_iv (MAP_FIXED)*/
		721	const_iv (MAP_PRIVATE)
		722	const_iv (MAP_SHARED)
		723	const_iv (MAP_ANONYMOUS)
		724
		725	/* linuxish */
		726	const_iv (MAP_HUGETLB)
		727	const_iv (MAP_LOCKED)
		728	const_iv (MAP_NORESERVE)
		729	const_iv (MAP_POPULATE)
		730	const_iv (MAP_NONBLOCK)
		731
		732	const_iv (MCL_FUTURE)
		733	const_iv (MCL_CURRENT)
		734
		735	const_eio (MS_ASYNC)
		736	const_eio (MS_INVALIDATE)
		737	const_eio (MS_SYNC)
		738
		739	const_eio (MT_MODIFY)
		740
		741	const_eio (SYNC_FILE_RANGE_WAIT_BEFORE)
		742	const_eio (SYNC_FILE_RANGE_WRITE)
		743	const_eio (SYNC_FILE_RANGE_WAIT_AFTER)
		744
		745	const_eio (READDIR_DENTS)
		746	const_eio (READDIR_DIRS_FIRST)
		747	const_eio (READDIR_STAT_ORDER)
		748	const_eio (READDIR_FOUND_UNKNOWN)
		749
		750	const_eio (DT_UNKNOWN)
		751	const_eio (DT_FIFO)
		752	const_eio (DT_CHR)
		753	const_eio (DT_DIR)
		754	const_eio (DT_BLK)
		755	const_eio (DT_REG)
		756	const_eio (DT_LNK)
		757	const_eio (DT_SOCK)
		758	const_eio (DT_WHT)
		759	};
		760
		761	aio_stash = gv_stashpv ("IO::AIO" , 1);
		762	aio_req_stash = gv_stashpv ("IO::AIO::REQ", 1);
		763	aio_grp_stash = gv_stashpv ("IO::AIO::GRP", 1);
		764
		765	for (civ = const_iv + sizeof (const_iv) / sizeof (const_iv [0]); civ-- > const_iv; )
		766	newCONSTSUB (aio_stash, (char *)civ->name, newSViv (civ->iv));
		767
		768	newCONSTSUB (aio_stash, "PAGESIZE", newSViv (PAGESIZE));
		769
785	create_pipe ();	770	create_respipe ();
786	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
787	}
788		771
		772	if (eio_init (want_poll, done_poll) < 0)
		773	croak ("IO::AIO: unable to initialise eio library");
		774
		775	/* atfork child called in fifo order, so before eio's handler */
		776	X_THREAD_ATFORK (0, 0, atfork_child);
		777	}
		778
789	void	779	void
790	min_parallel(nthreads)	780	max_poll_reqs (int nreqs)
791	int nthreads
792	PROTOTYPE: $	781	PROTOTYPE: $
		782	CODE:
		783	eio_set_max_poll_reqs (nreqs);
793		784
794	void	785	void
795	max_parallel(nthreads)	786	max_poll_time (double nseconds)
796	int nthreads
797	PROTOTYPE: $	787	PROTOTYPE: $
798
799	int
800	max_outstanding(nreqs)
801	int nreqs
802	PROTOTYPE: $
803	CODE:	788	CODE:
804	RETVAL = max_outstanding;	789	eio_set_max_poll_time (nseconds);
		790
		791	void
		792	min_parallel (int nthreads)
		793	PROTOTYPE: $
		794	CODE:
		795	eio_set_min_parallel (nthreads);
		796
		797	void
		798	max_parallel (int nthreads)
		799	PROTOTYPE: $
		800	CODE:
		801	eio_set_max_parallel (nthreads);
		802
		803	void
		804	max_idle (int nthreads)
		805	PROTOTYPE: $
		806	CODE:
		807	eio_set_max_idle (nthreads);
		808
		809	void
		810	max_outstanding (int maxreqs)
		811	PROTOTYPE: $
		812	CODE:
805	max_outstanding = nreqs;	813	max_outstanding = maxreqs;
806		814
807	void	815	void
808	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	816	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
809	SV * pathname
810	int flags
811	int mode
812	SV * callback
813	PROTOTYPE: $$$;$	817	PROTOTYPE: $$$;$
814	CODE:	818	PPCODE:
815	{	819	{
816	dREQ;	820	dREQ;
817		821
818	req->type = REQ_OPEN;	822	req->type = EIO_OPEN;
819	req->data = newSVsv (pathname);	823	req->sv1 = newSVsv (pathname);
820	req->dataptr = SvPVbyte_nolen (req->data);	824	req->ptr1 = SvPVbyte_nolen (req->sv1);
821	req->fd = flags;	825	req->int1 = flags;
822	req->mode = mode;	826	req->int2 = mode;
823		827
824	send_req (req);	828	REQ_SEND;
825	}	829	}
826		830
827	void	831	void
828	aio_close(fh,callback=&PL_sv_undef)	832	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
829	SV * fh
830	SV * callback
831	PROTOTYPE: $;$	833	PROTOTYPE: $;$
832	ALIAS:	834	ALIAS:
833	aio_close = REQ_CLOSE
834	aio_fsync = REQ_FSYNC	835	aio_fsync = EIO_FSYNC
835	aio_fdatasync = REQ_FDATASYNC	836	aio_fdatasync = EIO_FDATASYNC
836	CODE:	837	PPCODE:
837	{	838	{
		839	int fd = s_fileno_croak (fh, 0);
838	dREQ;	840	dREQ;
839		841
840	req->type = ix;	842	req->type = ix;
841	req->fh = newSVsv (fh);	843	req->sv1 = newSVsv (fh);
842	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	844	req->int1 = fd;
843		845
844	send_req (req);	846	REQ_SEND (req);
845	}	847	}
846		848
847	void	849	void
		850	aio_sync_file_range (SV *fh, off_t offset, size_t nbytes, UV flags, SV *callback=&PL_sv_undef)
		851	PROTOTYPE: $$$$;$
		852	PPCODE:
		853	{
		854	int fd = s_fileno_croak (fh, 0);
		855	dREQ;
		856
		857	req->type = EIO_SYNC_FILE_RANGE;
		858	req->sv1 = newSVsv (fh);
		859	req->int1 = fd;
		860	req->offs = offset;
		861	req->size = nbytes;
		862	req->int2 = flags;
		863
		864	REQ_SEND (req);
		865	}
		866
		867	void
		868	aio_close (SV *fh, SV *callback=&PL_sv_undef)
		869	PROTOTYPE: $;$
		870	PPCODE:
		871	{
		872	static int close_pipe = -1; /* dummy fd to close fds via dup2 */
		873	int fd = s_fileno_croak (fh, 0);
		874	dREQ;
		875
		876	if (close_pipe < 0)
		877	{
		878	int pipefd [2];
		879
		880	if (pipe (pipefd) < 0
		881	|| close (pipefd [1]) < 0
		882	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
		883	abort (); /*D*/
		884
		885	close_pipe = pipefd [0];
		886	}
		887
		888	req->type = EIO_DUP2;
		889	req->int1 = close_pipe;
		890	req->sv2 = newSVsv (fh);
		891	req->int2 = fd;
		892
		893	REQ_SEND (req);
		894	}
		895
		896	void
848	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	897	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
849	SV * fh
850	UV offset
851	UV length
852	SV * data
853	UV dataoffset
854	SV * callback
855	ALIAS:	898	ALIAS:
856	aio_read = REQ_READ	899	aio_read = EIO_READ
857	aio_write = REQ_WRITE	900	aio_write = EIO_WRITE
858	PROTOTYPE: $$$$$;$	901	PROTOTYPE: $$$$$;$
859	CODE:	902	PPCODE:
860	{	903	{
861	aio_req req;
862	STRLEN svlen;	904	STRLEN svlen;
		905	int fd = s_fileno_croak (fh, ix == EIO_WRITE);
863	char *svptr = SvPVbyte (data, svlen);	906	char *svptr = SvPVbyte (data, svlen);
864		907	UV len = SvUV (length);
865	SvUPGRADE (data, SVt_PV);
866	SvPOK_on (data);
867		908
868	if (dataoffset < 0)	909	if (dataoffset < 0)
869	dataoffset += svlen;	910	dataoffset += svlen;
870		911
871	if (dataoffset < 0 || dataoffset > svlen)	912	if (dataoffset < 0 || dataoffset > svlen)
872	croak ("data offset outside of string");	913	croak ("dataoffset outside of data scalar");
873		914
874	if (ix == REQ_WRITE)	915	if (ix == EIO_WRITE)
875	{	916	{
876	/* write: check length and adjust. */	917	/* write: check length and adjust. */
877	if (length < 0 || length + dataoffset > svlen)	918	if (!SvOK (length) || len + dataoffset > svlen)
878	length = svlen - dataoffset;	919	len = svlen - dataoffset;
879	}	920	}
880	else	921	else
881	{	922	{
882	/* read: grow scalar as necessary */	923	/* read: check type and grow scalar as necessary */
		924	SvUPGRADE (data, SVt_PV);
883	svptr = SvGROW (data, length + dataoffset);	925	svptr = SvGROW (data, len + dataoffset + 1);
884	}	926	}
885
886	if (length < 0)
887	croak ("length must not be negative");
888		927
889	{	928	{
890	dREQ;	929	dREQ;
891		930
892	req->type = ix;	931	req->type = ix;
893	req->fh = newSVsv (fh);	932	req->sv1 = newSVsv (fh);
894	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	933	req->int1 = fd;
895	: IoOFP (sv_2io (fh)));	934	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
896	req->offset = offset;	935	req->size = len;
897	req->length = length;
898	req->data = SvREFCNT_inc (data);	936	req->sv2 = SvREFCNT_inc (data);
899	req->dataptr = (char *)svptr + dataoffset;	937	req->ptr2 = (char *)svptr + dataoffset;
		938	req->stroffset = dataoffset;
900		939
901	if (!SvREADONLY (data))	940	if (!SvREADONLY (data))
902	{	941	{
903	SvREADONLY_on (data);	942	SvREADONLY_on (data);
904	req->data2ptr = (void *)data;	943	req->flags |= FLAG_SV2_RO_OFF;
905	}	944	}
906		945
907	send_req (req);	946	REQ_SEND;
908	}	947	}
909	}	948	}
910		949
911	void	950	void
		951	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		952	PROTOTYPE: $$;$
		953	PPCODE:
		954	{
		955	SV *data;
		956	dREQ;
		957
		958	req->type = EIO_READLINK;
		959	req->sv1 = newSVsv (path);
		960	req->ptr1 = SvPVbyte_nolen (req->sv1);
		961
		962	REQ_SEND;
		963	}
		964
		965	void
912	aio_sendfile(out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	966	aio_sendfile (SV *out_fh, SV *in_fh, off_t in_offset, size_t length, SV *callback=&PL_sv_undef)
913	SV * out_fh
914	SV * in_fh
915	UV in_offset
916	UV length
917	SV * callback
918	PROTOTYPE: $$$$;$	967	PROTOTYPE: $$$$;$
919	CODE:	968	PPCODE:
920	{	969	{
		970	int ifd = s_fileno_croak (in_fh , 0);
		971	int ofd = s_fileno_croak (out_fh, 1);
921	dREQ;	972	dREQ;
922		973
923	req->type = REQ_SENDFILE;	974	req->type = EIO_SENDFILE;
924	req->fh = newSVsv (out_fh);	975	req->sv1 = newSVsv (out_fh);
925	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	976	req->int1 = ofd;
926	req->fh2 = newSVsv (in_fh);	977	req->sv2 = newSVsv (in_fh);
927	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	978	req->int2 = ifd;
928	req->offset = in_offset;	979	req->offs = in_offset;
929	req->length = length;	980	req->size = length;
930		981
931	send_req (req);	982	REQ_SEND;
932	}	983	}
933		984
934	void	985	void
935	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	986	aio_readahead (SV *fh, off_t offset, size_t length, SV *callback=&PL_sv_undef)
936	SV * fh
937	UV offset
938	IV length
939	SV * callback
940	PROTOTYPE: $$$;$	987	PROTOTYPE: $$$;$
941	CODE:	988	PPCODE:
942	{	989	{
		990	int fd = s_fileno_croak (fh, 0);
943	dREQ;	991	dREQ;
944		992
945	req->type = REQ_READAHEAD;	993	req->type = EIO_READAHEAD;
946	req->fh = newSVsv (fh);	994	req->sv1 = newSVsv (fh);
947	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	995	req->int1 = fd;
948	req->offset = offset;	996	req->offs = offset;
949	req->length = length;	997	req->size = length;
950		998
951	send_req (req);	999	REQ_SEND;
952	}	1000	}
953		1001
954	void	1002	void
955	aio_stat(fh_or_path,callback=&PL_sv_undef)	1003	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
956	SV * fh_or_path
957	SV * callback
958	ALIAS:	1004	ALIAS:
959	aio_stat = REQ_STAT	1005	aio_stat = EIO_STAT
960	aio_lstat = REQ_LSTAT	1006	aio_lstat = EIO_LSTAT
		1007	aio_statvfs = EIO_STATVFS
961	CODE:	1008	PPCODE:
962	{	1009	{
963	dREQ;	1010	dREQ;
964		1011
965	New (0, req->statdata, 1, Stat_t);	1012	req->sv1 = newSVsv (fh_or_path);
966	if (!req->statdata)
967	{
968	free_req (req);
969	croak ("out of memory during aio_req->statdata allocation");
970	}
971		1013
972	if (SvPOK (fh_or_path))	1014	if (SvPOK (req->sv1))
973	{	1015	{
974	req->type = ix;	1016	req->type = ix;
975	req->data = newSVsv (fh_or_path);
976	req->dataptr = SvPVbyte_nolen (req->data);	1017	req->ptr1 = SvPVbyte_nolen (req->sv1);
977	}	1018	}
978	else	1019	else
979	{	1020	{
980	req->type = REQ_FSTAT;	1021	req->type = ix == EIO_STATVFS ? EIO_FSTATVFS : EIO_FSTAT;
981	req->fh = newSVsv (fh_or_path);
982	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1022	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
983	}	1023	}
984		1024
985	send_req (req);	1025	REQ_SEND;
986	}	1026	}
987		1027
988	void	1028	void
		1029	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		1030	PPCODE:
		1031	{
		1032	dREQ;
		1033
		1034	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		1035	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		1036	req->sv1 = newSVsv (fh_or_path);
		1037
		1038	if (SvPOK (req->sv1))
		1039	{
		1040	req->type = EIO_UTIME;
		1041	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1042	}
		1043	else
		1044	{
		1045	req->type = EIO_FUTIME;
		1046	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1047	}
		1048
		1049	REQ_SEND;
		1050	}
		1051
		1052	void
		1053	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		1054	PPCODE:
		1055	{
		1056	dREQ;
		1057
		1058	req->sv1 = newSVsv (fh_or_path);
		1059	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		1060
		1061	if (SvPOK (req->sv1))
		1062	{
		1063	req->type = EIO_TRUNCATE;
		1064	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1065	}
		1066	else
		1067	{
		1068	req->type = EIO_FTRUNCATE;
		1069	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1070	}
		1071
		1072	REQ_SEND;
		1073	}
		1074
		1075	void
		1076	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		1077	ALIAS:
		1078	aio_chmod = EIO_CHMOD
		1079	aio_mkdir = EIO_MKDIR
		1080	PPCODE:
		1081	{
		1082	dREQ;
		1083
		1084	req->int2 = mode;
		1085	req->sv1 = newSVsv (fh_or_path);
		1086
		1087	if (SvPOK (req->sv1))
		1088	{
		1089	req->type = ix;
		1090	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1091	}
		1092	else
		1093	{
		1094	req->type = EIO_FCHMOD;
		1095	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1096	}
		1097
		1098	REQ_SEND;
		1099	}
		1100
		1101	void
		1102	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		1103	PPCODE:
		1104	{
		1105	dREQ;
		1106
		1107	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		1108	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		1109	req->sv1 = newSVsv (fh_or_path);
		1110
		1111	if (SvPOK (req->sv1))
		1112	{
		1113	req->type = EIO_CHOWN;
		1114	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1115	}
		1116	else
		1117	{
		1118	req->type = EIO_FCHOWN;
		1119	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1120	}
		1121
		1122	REQ_SEND;
		1123	}
		1124
		1125	void
		1126	aio_readdirx (SV8 *pathname, IV flags, SV *callback=&PL_sv_undef)
		1127	PPCODE:
		1128	{
		1129	dREQ;
		1130
		1131	req->type = EIO_READDIR;
		1132	req->sv1 = newSVsv (pathname);
		1133	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1134	req->int1 = flags | EIO_READDIR_DENTS | EIO_READDIR_CUSTOM1;
		1135
		1136	if (flags & EIO_READDIR_DENTS)
		1137	req->int1 |= EIO_READDIR_CUSTOM2;
		1138
		1139	REQ_SEND;
		1140	}
		1141
		1142	void
989	aio_unlink(pathname,callback=&PL_sv_undef)	1143	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
990	SV * pathname
991	SV * callback
992	ALIAS:	1144	ALIAS:
993	aio_unlink = REQ_UNLINK	1145	aio_unlink = EIO_UNLINK
994	aio_rmdir = REQ_RMDIR	1146	aio_rmdir = EIO_RMDIR
		1147	aio_readdir = EIO_READDIR
995	CODE:	1148	PPCODE:
996	{	1149	{
997	dREQ;	1150	dREQ;
998		1151
999	req->type = ix;	1152	req->type = ix;
1000	req->data = newSVsv (pathname);	1153	req->sv1 = newSVsv (pathname);
1001	req->dataptr = SvPVbyte_nolen (req->data);	1154	req->ptr1 = SvPVbyte_nolen (req->sv1);
1002
1003	send_req (req);
1004	}
1005		1155
		1156	REQ_SEND;
		1157	}
		1158
1006	void	1159	void
1007	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1160	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
1008	SV * oldpath	1161	ALIAS:
1009	SV * newpath	1162	aio_link = EIO_LINK
1010	SV * callback	1163	aio_symlink = EIO_SYMLINK
		1164	aio_rename = EIO_RENAME
1011	CODE:	1165	PPCODE:
1012	{	1166	{
1013	dREQ;	1167	dREQ;
1014		1168
1015	req->type = REQ_SYMLINK;	1169	req->type = ix;
1016	req->fh = newSVsv (oldpath);	1170	req->sv1 = newSVsv (oldpath);
1017	req->data2ptr = SvPVbyte_nolen (req->fh);	1171	req->ptr1 = SvPVbyte_nolen (req->sv1);
1018	req->data = newSVsv (newpath);	1172	req->sv2 = newSVsv (newpath);
1019	req->dataptr = SvPVbyte_nolen (req->data);	1173	req->ptr2 = SvPVbyte_nolen (req->sv2);
1020		1174
1021	send_req (req);	1175	REQ_SEND;
1022	}	1176	}
1023		1177
1024	void	1178	void
1025	aio_readdir(pathname,callback=&PL_sv_undef)	1179	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
1026	SV * pathname
1027	SV * callback
1028	CODE:	1180	PPCODE:
1029	{	1181	{
1030	dREQ;	1182	dREQ;
1031		1183
1032	req->type = REQ_READDIR;	1184	req->type = EIO_MKNOD;
1033	req->data = newSVsv (pathname);	1185	req->sv1 = newSVsv (pathname);
1034	req->dataptr = SvPVbyte_nolen (req->data);	1186	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1187	req->int2 = (mode_t)mode;
		1188	req->offs = dev;
1035		1189
1036	send_req (req);	1190	REQ_SEND;
1037	}	1191	}
1038		1192
1039	void	1193	void
		1194	aio_mtouch (SV8 *data, IV offset = 0, SV *length = &PL_sv_undef, int flags = 0, SV *callback=&PL_sv_undef)
		1195	ALIAS:
		1196	aio_mtouch = EIO_MTOUCH
		1197	aio_msync = EIO_MSYNC
		1198	PROTOTYPE: $$$$;$
		1199	PPCODE:
		1200	{
		1201	STRLEN svlen;
		1202	UV len = SvUV (length);
		1203	char *svptr = SvPVbyte (data, svlen);
		1204
		1205	if (offset < 0)
		1206	offset += svlen;
		1207
		1208	if (offset < 0 || offset > svlen)
		1209	croak ("offset outside of scalar");
		1210
		1211	if (!SvOK (length) || len + offset > svlen)
		1212	len = svlen - offset;
		1213
		1214	{
		1215	dREQ;
		1216
		1217	req->type = ix;
		1218	req->size = len;
		1219	req->sv2 = SvREFCNT_inc (data);
		1220	req->ptr2 = (char *)svptr + offset;
		1221	req->int1 = flags;
		1222
		1223	REQ_SEND;
		1224	}
		1225	}
		1226
		1227	void
		1228	aio_busy (double delay, SV *callback=&PL_sv_undef)
		1229	PPCODE:
		1230	{
		1231	dREQ;
		1232
		1233	req->type = EIO_BUSY;
		1234	req->nv1 = delay < 0. ? 0. : delay;
		1235
		1236	REQ_SEND;
		1237	}
		1238
		1239	void
		1240	aio_group (SV *callback=&PL_sv_undef)
		1241	PROTOTYPE: ;$
		1242	PPCODE:
		1243	{
		1244	dREQ;
		1245
		1246	req->type = EIO_GROUP;
		1247
		1248	req_submit (req);
		1249	XPUSHs (req_sv (req, aio_grp_stash));
		1250	}
		1251
		1252	void
		1253	aio_nop (SV *callback=&PL_sv_undef)
		1254	ALIAS:
		1255	aio_nop = EIO_NOP
		1256	aio_sync = EIO_SYNC
		1257	PPCODE:
		1258	{
		1259	dREQ;
		1260
		1261	req->type = ix;
		1262
		1263	REQ_SEND;
		1264	}
		1265
		1266	int
		1267	aioreq_pri (int pri = 0)
		1268	PROTOTYPE: ;$
		1269	CODE:
		1270	RETVAL = next_pri;
		1271	if (items > 0)
		1272	{
		1273	if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
		1274	if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
		1275	next_pri = pri;
		1276	}
		1277	OUTPUT:
		1278	RETVAL
		1279
		1280	void
		1281	aioreq_nice (int nice = 0)
		1282	CODE:
		1283	nice = next_pri - nice;
		1284	if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
		1285	if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
		1286	next_pri = nice;
		1287
		1288	void
1040	flush()	1289	flush ()
1041	PROTOTYPE:	1290	PROTOTYPE:
1042	CODE:	1291	CODE:
1043	while (nreqs)	1292	while (eio_nreqs ())
1044	{	1293	{
1045	poll_wait ();	1294	poll_wait ();
1046	poll_cb ();	1295	poll_cb ();
1047	}	1296	}
1048		1297
1049	void	1298	int
1050	poll()	1299	poll()
1051	PROTOTYPE:	1300	PROTOTYPE:
1052	CODE:	1301	CODE:
1053	if (nreqs)
1054	{
1055	poll_wait ();	1302	poll_wait ();
1056	poll_cb ();	1303	RETVAL = poll_cb ();
1057	}	1304	OUTPUT:
		1305	RETVAL
1058		1306
1059	int	1307	int
1060	poll_fileno()	1308	poll_fileno()
1061	PROTOTYPE:	1309	PROTOTYPE:
1062	CODE:	1310	CODE:
1063	RETVAL = respipe [0];	1311	RETVAL = s_epipe_fd (&respipe);
1064	OUTPUT:	1312	OUTPUT:
1065	RETVAL	1313	RETVAL
1066		1314
1067	int	1315	int
1068	poll_cb(...)	1316	poll_cb(...)
…		…
1074		1322
1075	void	1323	void
1076	poll_wait()	1324	poll_wait()
1077	PROTOTYPE:	1325	PROTOTYPE:
1078	CODE:	1326	CODE:
1079	if (nreqs)
1080	poll_wait ();	1327	poll_wait ();
1081		1328
1082	int	1329	int
1083	nreqs()	1330	nreqs()
1084	PROTOTYPE:	1331	PROTOTYPE:
1085	CODE:	1332	CODE:
1086	RETVAL = nreqs;	1333	RETVAL = eio_nreqs ();
1087	OUTPUT:	1334	OUTPUT:
1088	RETVAL	1335	RETVAL
1089		1336
		1337	int
		1338	nready()
		1339	PROTOTYPE:
		1340	CODE:
		1341	RETVAL = eio_nready ();
		1342	OUTPUT:
		1343	RETVAL
		1344
		1345	int
		1346	npending()
		1347	PROTOTYPE:
		1348	CODE:
		1349	RETVAL = eio_npending ();
		1350	OUTPUT:
		1351	RETVAL
		1352
		1353	int
		1354	nthreads()
		1355	PROTOTYPE:
		1356	CODE:
		1357	RETVAL = eio_nthreads ();
		1358	OUTPUT:
		1359	RETVAL
		1360
		1361	int
		1362	fadvise (aio_rfd fh, off_t offset, off_t length, IV advice)
		1363	PROTOTYPE: $$$$
		1364	CODE:
		1365	#if _XOPEN_SOURCE >= 600 && !NO_FADVISE
		1366	RETVAL = posix_fadvise (fh, offset, length, advice);
		1367	#else
		1368	RETVAL = errno = ENOSYS; /* yes, this is actually correct */
		1369	#endif
		1370	OUTPUT:
		1371	RETVAL
		1372
		1373	ssize_t
		1374	sendfile (aio_wfd ofh, aio_rfd ifh, off_t offset, size_t count)
		1375	PROTOTYPE: $$$$
		1376	CODE:
		1377	RETVAL = eio_sendfile_sync (ofh, ifh, offset, count);
		1378	OUTPUT:
		1379	RETVAL
		1380
		1381	void
		1382	mmap (SV *scalar, size_t length, int prot, int flags, SV *fh, off_t offset = 0)
		1383	PROTOTYPE: $$$$$;$
		1384	PPCODE:
		1385	sv_unmagic (scalar, MMAP_MAGIC);
		1386	{
		1387	int fd = SvOK (fh) ? s_fileno_croak (fh, flags & PROT_WRITE) : -1;
		1388	void *addr = (void *)mmap (0, length, prot, flags, fd, offset);
		1389	if (addr == (void *)-1)
		1390	XSRETURN_NO;
		1391
		1392	/* we store the length in mg_obj, as namlen is I32 :/ */
		1393	sv_magicext (scalar, 0, MMAP_MAGIC, &mmap_vtbl, (char *)addr, 0)
		1394	->mg_obj = (SV *)length;
		1395
		1396	SvUPGRADE (scalar, SVt_PV); /* nop... */
		1397	if (!(prot & PROT_WRITE))
		1398	SvREADONLY_on (scalar);
		1399
		1400	SvPVX (scalar) = (char *)addr;
		1401	SvCUR_set (scalar, length);
		1402	SvLEN_set (scalar, 0);
		1403	SvPOK_only (scalar);
		1404
		1405	XSRETURN_YES;
		1406	}
		1407
		1408	void
		1409	munmap (SV *scalar)
		1410	PROTOTYPE: $
		1411	CODE:
		1412	sv_unmagic (scalar, MMAP_MAGIC);
		1413
		1414	int
		1415	mlockall (int flags)
		1416	PROTOTYPE: $
		1417	CODE:
		1418	#if _POSIX_MEMLOCK
		1419	#if __GLIBC__ == 2 && __GLIBC_MINOR__ <= 7
		1420	extern int mallopt (int, int);
		1421	mallopt (-6, 238); /* http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=473812 */
		1422	#endif
		1423	mlockall (flags);
		1424	#else
		1425	RETVAL = -1;
		1426	errno = ENOSYS;
		1427	#endif
		1428	OUTPUT:
		1429	RETVAL
		1430
		1431	int
		1432	munlockall ()
		1433	PROTOTYPE:
		1434	CODE:
		1435	#if _POSIX_MEMLOCK
		1436	munlockall ();
		1437	#else
		1438	RETVAL = -1;
		1439	errno = ENOSYS;
		1440	#endif
		1441	OUTPUT:
		1442	RETVAL
		1443
		1444	void _on_next_submit (SV *cb)
		1445	CODE:
		1446	SvREFCNT_dec (on_next_submit);
		1447	on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
		1448
		1449	PROTOTYPES: DISABLE
		1450
		1451	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1452
		1453	void
		1454	cancel (aio_req_ornot req)
		1455	CODE:
		1456	eio_cancel (req);
		1457
		1458	void
		1459	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1460	PPCODE:
		1461	{
		1462	if (GIMME_V != G_VOID)
		1463	XPUSHs (req->callback ? sv_2mortal (newRV_inc (req->callback)) : &PL_sv_undef);
		1464
		1465	if (items > 1)
		1466	{
		1467	SV *cb_cv =get_cb (callback);
		1468
		1469	SvREFCNT_dec (req->callback);
		1470	req->callback = SvREFCNT_inc (cb_cv);
		1471	}
		1472	}
		1473
		1474	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1475
		1476	void
		1477	add (aio_req grp, ...)
		1478	PPCODE:
		1479	{
		1480	int i;
		1481
		1482	if (grp->int1 == 2)
		1483	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1484
		1485	for (i = 1; i < items; ++i )
		1486	{
		1487	aio_req req;
		1488
		1489	if (GIMME_V != G_VOID)
		1490	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1491
		1492	req = SvAIO_REQ (ST (i));
		1493
		1494	if (req)
		1495	eio_grp_add (grp, req);
		1496	}
		1497	}
		1498
		1499	void
		1500	cancel_subs (aio_req_ornot req)
		1501	CODE:
		1502	req_cancel_subs (req);
		1503
		1504	void
		1505	result (aio_req grp, ...)
		1506	CODE:
		1507	{
		1508	int i;
		1509	AV *av;
		1510
		1511	grp->errorno = errno;
		1512
		1513	av = newAV ();
		1514	av_extend (av, items - 1);
		1515
		1516	for (i = 1; i < items; ++i )
		1517	av_push (av, newSVsv (ST (i)));
		1518
		1519	SvREFCNT_dec (grp->sv1);
		1520	grp->sv1 = (SV *)av;
		1521	}
		1522
		1523	void
		1524	errno (aio_req grp, int errorno = errno)
		1525	CODE:
		1526	grp->errorno = errorno;
		1527
		1528	void
		1529	limit (aio_req grp, int limit)
		1530	CODE:
		1531	eio_grp_limit (grp, limit);
		1532
		1533	void
		1534	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1535	CODE:
		1536	{
		1537	SvREFCNT_dec (grp->sv2);
		1538	grp->sv2 = newSVsv (callback);
		1539	grp->feed = aio_grp_feed;
		1540
		1541	if (grp->int2 <= 0)
		1542	grp->int2 = 2;
		1543
		1544	eio_grp_limit (grp, grp->int2);
		1545	}
		1546

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