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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.29 by root, Wed Aug 17 06:12:10 2005 UTC vs.
Revision 1.185 by root, Thu Jul 7 22:36:18 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
		11	#include <stddef.h>
		12	#include <stdlib.h>
		13	#include <errno.h>
10	#include <sys/types.h>	14	#include <sys/types.h>
11	#include <sys/stat.h>	15	#include <sys/stat.h>
12		16	#include <sys/statvfs.h>
13	#include <unistd.h>	17	#include <limits.h>
14	#include <fcntl.h>	18	#include <fcntl.h>
15	#include <signal.h>
16	#include <sched.h>	19	#include <sched.h>
17		20
18	#include <pthread.h>	21	#if _POSIX_MEMLOCK || _POSIX_MEMLOCK_RANGE || _POSIX_MAPPED_FILES
		22	# include <sys/mman.h>
		23	#endif
19		24
20	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	25	/* perl namespace pollution */
21	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	26	#undef VERSION
22	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
23		27
24	#if __ia64	28	#ifdef _WIN32
25	# define STACKSIZE 65536	29
		30	# define EIO_STRUCT_DIRENT Direntry_t
		31	# undef malloc
		32	# undef free
		33
		34	// perl overrides all those nice win32 functions
		35	# undef open
		36	# undef read
		37	# undef write
		38	# undef send
		39	# undef recv
		40	# undef stat
		41	# undef fstat
		42	# define lstat stat
		43	# undef truncate
		44	# undef ftruncate
		45	# undef open
		46	# undef close
		47	# undef unlink
		48	# undef rmdir
		49	# undef rename
		50	# undef lseek
		51
		52	# define chown(a,b,c) (errno = ENOSYS, -1)
		53	# define fchown(a,b,c) (errno = ENOSYS, -1)
		54	# define fchmod(a,b) (errno = ENOSYS, -1)
		55	# define symlink(a,b) (errno = ENOSYS, -1)
		56	# define readlink(a,b,c) (errno = ENOSYS, -1)
		57	# define mknod(a,b,c) (errno = ENOSYS, -1)
		58	# define truncate(a,b) (errno = ENOSYS, -1)
		59	# define ftruncate(fd,o) chsize ((fd), (o))
		60	# define fsync(fd) _commit (fd)
		61	# define opendir(fd) (errno = ENOSYS, 0)
		62	# define readdir(fd) (errno = ENOSYS, -1)
		63	# define closedir(fd) (errno = ENOSYS, -1)
		64	# define mkdir(a,b) mkdir (a)
		65
26	#else	66	#else
27	# define STACKSIZE 4096	67
		68	# include <sys/time.h>
		69	# include <sys/select.h>
		70	# include <unistd.h>
		71	# include <utime.h>
		72	# include <signal.h>
		73	# define EIO_STRUCT_DIRENT struct dirent
		74
		75	#endif
		76
		77	/* perl stupidly overrides readdir and maybe others */
		78	/* with thread-unsafe versions, imagine that :( */
		79	#undef readdir
		80	#undef opendir
		81	#undef closedir
		82
		83	#define EIO_STRUCT_STAT Stat_t
		84
		85	/* use NV for 32 bit perls as it allows larger offsets */
		86	#if IVSIZE >= 8
		87	# define VAL64 IV
		88	# define SvVAL64 SvIV
		89	# define newSVval64 newSViv
		90	#else
		91	# define VAL64 NV
		92	# define SvVAL64 SvNV
		93	# define newSVval64 newSVnv
		94	#endif
		95
		96	/*****************************************************************************/
		97
		98	#if __GNUC__ >= 3
		99	# define expect(expr,value) __builtin_expect ((expr),(value))
		100	#else
		101	# define expect(expr,value) (expr)
		102	#endif
		103
		104	#define expect_false(expr) expect ((expr) != 0, 0)
		105	#define expect_true(expr) expect ((expr) != 0, 1)
		106
		107	/*****************************************************************************/
		108
		109	typedef SV SV8; /* byte-sv, used for argument-checking */
		110	typedef int aio_rfd; /* read file desriptor */
		111	typedef int aio_wfd; /* write file descriptor */
		112
		113	static HV *aio_stash, *aio_req_stash, *aio_grp_stash;
		114
		115	#define EIO_REQ_MEMBERS \
		116	SV *callback; \
		117	SV *sv1, *sv2; \
		118	STRLEN stroffset; \
		119	SV *self;
		120
		121	#define EIO_NO_WRAPPERS 1
		122
		123	#include "libeio/config.h"
		124	#include "libeio/eio.h"
		125
		126	/* Linux/others */
		127	#ifndef O_ASYNC
		128	# define O_ASYNC 0
		129	#endif
		130	#ifndef O_DIRECT
		131	# define O_DIRECT 0
		132	#endif
		133	#ifndef O_NOATIME
		134	# define O_NOATIME 0
		135	#endif
		136
		137	/* POSIX */
		138	#ifndef O_CLOEXEC
		139	# define O_CLOEXEC 0
		140	#endif
		141	#ifndef O_NOFOLLOW
		142	# define O_NOFOLLOW 0
		143	#endif
		144	#ifndef O_NOCTTY
		145	# define O_NOCTTY 0
		146	#endif
		147	#ifndef O_NONBLOCK
		148	# define O_NONBLOCK 0
		149	#endif
		150	#ifndef O_EXEC
		151	# define O_EXEC 0
		152	#endif
		153	#ifndef O_SEARCH
		154	# define O_SEARCH 0
		155	#endif
		156	#ifndef O_DIRECTORY
		157	# define O_DIRECTORY 0
		158	#endif
		159	#ifndef O_DSYNC
		160	# define O_DSYNC 0
		161	#endif
		162	#ifndef O_RSYNC
		163	# define O_RSYNC 0
		164	#endif
		165	#ifndef O_SYNC
		166	# define O_SYNC 0
		167	#endif
		168	#ifndef O_TTY_INIT
		169	# define O_TTY_INIT 0
		170	#endif
		171
		172	#ifndef POSIX_FADV_NORMAL
		173	# define POSIX_FADV_NORMAL 0
		174	#endif
		175	#ifndef POSIX_FADV_SEQUENTIAL
		176	# define POSIX_FADV_SEQUENTIAL 0
		177	#endif
		178	#ifndef POSIX_FADV_RANDOM
		179	# define POSIX_FADV_RANDOM 0
		180	#endif
		181	#ifndef POSIX_FADV_NOREUSE
		182	# define POSIX_FADV_NOREUSE 0
		183	#endif
		184	#ifndef POSIX_FADV_WILLNEED
		185	# define POSIX_FADV_WILLNEED 0
		186	#endif
		187	#ifndef POSIX_FADV_DONTNEED
		188	# define POSIX_FADV_DONTNEED 0
		189	#endif
		190
		191	#if !HAVE_POSIX_FADVISE
		192	# define posix_fadvise(a,b,c,d) errno = ENOSYS /* also return ENOSYS */
		193	#endif
		194
		195	#ifndef POSIX_MADV_NORMAL
		196	# define POSIX_MADV_NORMAL 0
		197	#endif
		198	#ifndef POSIX_MADV_SEQUENTIAL
		199	# define POSIX_MADV_SEQUENTIAL 0
		200	#endif
		201	#ifndef POSIX_MADV_RANDOM
		202	# define POSIX_MADV_RANDOM 0
		203	#endif
		204	#ifndef POSIX_MADV_WILLNEED
		205	# define POSIX_MADV_WILLNEED 0
		206	#endif
		207	#ifndef POSIX_MADV_DONTNEED
		208	# define POSIX_MADV_DONTNEED 0
		209	#endif
		210
		211	#if !HAVE_POSIX_MADVISE
		212	# define posix_madvise(a,b,c) errno = ENOSYS /* also return ENOSYS */
		213	#endif
		214
		215	#ifndef PROT_NONE
		216	# define PROT_NONE 0
		217	#endif
		218	#ifndef PROT_READ
		219	# define PROT_READ 0
		220	#endif
		221	#ifndef PROT_WRITE
		222	# define PROT_READ 0
		223	#endif
		224	#ifndef PROT_EXEC
		225	# define PROT_EXEC 0
		226	#endif
		227
		228	#ifndef ST_NODEV
		229	# define ST_NODEV 0
		230	#endif
		231	#ifndef ST_NOEXEC
		232	# define ST_NOEXEC 0
		233	#endif
		234	#ifndef ST_SYNCHRONOUS
		235	# define ST_SYNCHRONOUS 0
		236	#endif
		237	#ifndef ST_MANDLOCK
		238	# define ST_MANDLOCK 0
		239	#endif
		240	#ifndef ST_WRITE
		241	# define ST_WRITE 0
		242	#endif
		243	#ifndef ST_APPEND
		244	# define ST_APPEND 0
		245	#endif
		246	#ifndef ST_IMMUTABLE
		247	# define ST_IMMUTABLE 0
		248	#endif
		249	#ifndef ST_NOATIME
		250	# define ST_NOATIME 0
		251	#endif
		252	#ifndef ST_NODIRATIME
		253	# define ST_NODIRATIME 0
		254	#endif
		255	#ifndef ST_RELATIME
		256	# define ST_RELATIME 0
		257	#endif
		258
		259	#ifndef S_IFIFO
		260	# define S_IFIFO 0
		261	#endif
		262	#ifndef S_IFCHR
		263	# define S_IFCHR 0
		264	#endif
		265	#ifndef S_IFBLK
		266	# define S_IFBLK 0
		267	#endif
		268	#ifndef S_IFLNK
		269	# define S_IFLNK 0
		270	#endif
		271	#ifndef S_IFREG
		272	# define S_IFREG 0
		273	#endif
		274	#ifndef S_IFDIR
		275	# define S_IFDIR 0
		276	#endif
		277	#ifndef S_IFWHT
		278	# define S_IFWHT 0
		279	#endif
		280	#ifndef S_IFSOCK
		281	# define S_IFSOCK 0
		282	#endif
		283
		284	#ifndef MAP_ANONYMOUS
		285	# ifdef MAP_ANON
		286	# define MAP_ANONYMOUS MAP_ANON
		287	# else
		288	# define MAP_ANONYMOUS MAP_FIXED /* and hope this fails */
28	#endif	289	# endif
		290	#endif
		291	#ifndef MAP_HUGETLB
		292	# define MAP_HUGETLB 0
		293	#endif
		294	#ifndef MAP_LOCKED
		295	# define MAP_LOCKED 0
		296	#endif
		297	#ifndef MAP_NORESERVE
		298	# define MAP_NORESERVE 0
		299	#endif
		300	#ifndef MAP_POPULATE
		301	# define MAP_POPULATE 0
		302	#endif
		303	#ifndef MAP_NONBLOCK
		304	# define MAP_NONBLOCK 0
		305	#endif
		306
		307	#ifndef makedev
		308	# define makedev(maj,min) (((maj) << 8) | (min))
		309	#endif
		310	#ifndef major
		311	# define major(dev) ((dev) >> 8)
		312	#endif
		313	#ifndef minor
		314	# define minor(dev) ((dev) & 0xff)
		315	#endif
		316
		317	#ifndef PAGESIZE
		318	# define PAGESIZE sysconf (_SC_PAGESIZE)
		319	#endif
		320
		321	static int req_invoke (eio_req *req);
		322	#define EIO_FINISH(req) req_invoke (req)
		323	static void req_destroy (eio_req *grp);
		324	#define EIO_DESTROY(req) req_destroy (req)
29		325
30	enum {	326	enum {
31	REQ_QUIT,	327	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
32	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35	REQ_FSYNC, REQ_FDATASYNC,
36	REQ_UNLINK, REQ_RMDIR,
37	REQ_SYMLINK,
38	};	328	};
39		329
40	typedef struct aio_cb {	330	#include "libeio/eio.c"
41	struct aio_cb *volatile next;
42		331
43	int type;
44
45	int fd;
46	off_t offset;
47	size_t length;
48	ssize_t result;
49	mode_t mode; /* open */
50	int errorno;
51	SV *data, *callback, *fh;
52	void *dataptr, *data2ptr;
53	STRLEN dataoffset;
54
55	Stat_t *statdata;
56	} aio_cb;
57
58	typedef aio_cb *aio_req;	332	typedef eio_req *aio_req;
		333	typedef eio_req *aio_req_ornot;
59		334
60	static int started;	335	static SV *on_next_submit;
61	static volatile int nreqs;	336	static int next_pri = EIO_PRI_DEFAULT;
62	static int max_outstanding = 1<<30;	337	static int max_outstanding;
63	static int respipe [2];
64		338
65	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	339	static s_epipe respipe;
66	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
67	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
68		340
69	static volatile aio_req reqs, reqe; /* queue start, queue end */	341	static void req_destroy (aio_req req);
70	static volatile aio_req ress, rese; /* queue start, queue end */
71
72	static void free_req (aio_req req)	342	static void req_cancel (aio_req req);
73	{
74	if (req->data)
75	SvREFCNT_dec (req->data);
76		343
		344	static void want_poll (void)
		345	{
		346	/* write a dummy byte to the pipe so fh becomes ready */
		347	s_epipe_signal (&respipe);
		348	}
		349
		350	static void done_poll (void)
		351	{
		352	/* read any signals sent by the worker threads */
		353	s_epipe_drain (&respipe);
		354	}
		355
		356	/* must be called at most once */
		357	static SV *req_sv (aio_req req, HV *stash)
		358	{
77	if (req->fh)	359	if (!req->self)
78	SvREFCNT_dec (req->fh);
79
80	if (req->statdata)
81	Safefree (req->statdata);
82
83	if (req->callback)
84	SvREFCNT_dec (req->callback);
85
86	Safefree (req);
87	}
88
89	static void
90	poll_wait ()
91	{
92	if (nreqs && !ress)
93	{	360	{
94	fd_set rfd;	361	req->self = (SV *)newHV ();
95	FD_ZERO(&rfd);	362	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
96	FD_SET(respipe [0], &rfd);
97
98	select (respipe [0] + 1, &rfd, 0, 0, 0);
99	}	363	}
100	}
101		364
102	static int	365	return sv_2mortal (sv_bless (newRV_inc (req->self), stash));
103	poll_cb ()	366	}
104	{
105	dSP;
106	int count = 0;
107	int do_croak = 0;
108	aio_req req;
109		367
110	for (;;)	368	static aio_req SvAIO_REQ (SV *sv)
		369	{
		370	MAGIC *mg;
		371
		372	if (!SvROK (sv)
		373	|| (SvSTASH (SvRV (sv)) != aio_grp_stash
		374	&& SvSTASH (SvRV (sv)) != aio_req_stash
		375	&& !sv_derived_from (sv, "IO::AIO::REQ")))
		376	croak ("object of class IO::AIO::REQ expected");
		377
		378	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		379
		380	return mg ? (aio_req)mg->mg_ptr : 0;
		381	}
		382
		383	static void aio_grp_feed (aio_req grp)
		384	{
		385	if (grp->sv2 && SvOK (grp->sv2))
111	{	386	{
112	pthread_mutex_lock (&reslock);	387	dSP;
113	req = ress;
114		388
115	if (req)	389	ENTER;
		390	SAVETMPS;
		391	PUSHMARK (SP);
		392	XPUSHs (req_sv (grp, aio_grp_stash));
		393	PUTBACK;
		394	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		395	SPAGAIN;
		396	FREETMPS;
		397	LEAVE;
		398	}
		399	}
		400
		401	static void req_submit (eio_req *req)
		402	{
		403	eio_submit (req);
		404
		405	if (expect_false (on_next_submit))
		406	{
		407	dSP;
		408	SV *cb = sv_2mortal (on_next_submit);
		409
		410	on_next_submit = 0;
		411
		412	PUSHMARK (SP);
		413	PUTBACK;
		414	call_sv (cb, G_DISCARD | G_EVAL);
		415	}
		416	}
		417
		418	static int req_invoke (eio_req *req)
		419	{
		420	if (req->flags & FLAG_SV2_RO_OFF)
		421	SvREADONLY_off (req->sv2);
		422
		423	if (!EIO_CANCELLED (req) && req->callback)
		424	{
		425	dSP;
		426	static SV *sv_result_cache; /* caches the result integer SV */
		427	SV *sv_result;
		428
		429	ENTER;
		430	SAVETMPS;
		431	PUSHMARK (SP);
		432	EXTEND (SP, 1);
		433
		434	/* do not recreate the result IV from scratch each time */
		435	if (expect_true (sv_result_cache))
116	{	436	{
117	ress = req->next;	437	sv_result = sv_result_cache; sv_result_cache = 0;
118		438	SvIV_set (sv_result, req->result);
119	if (!ress)	439	SvIOK_only (sv_result);
120	{
121	rese = 0;
122
123	/* read any signals sent by the worker threads */
124	char buf [32];
125	while (read (respipe [0], buf, 32) == 32)
126	;
127	}
128	}
129
130	pthread_mutex_unlock (&reslock);
131
132	if (!req)
133	break;
134
135	nreqs--;
136
137	if (req->type == REQ_QUIT)
138	started--;
139	else
140	{
141	int errorno = errno;
142	errno = req->errorno;
143
144	if (req->type == REQ_READ)
145	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
146
147	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
148	SvREADONLY_off (req->data);
149
150	if (req->statdata)
151	{
152	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
153	PL_laststatval = req->result;
154	PL_statcache = *(req->statdata);
155	}
156
157	ENTER;
158	PUSHMARK (SP);
159	XPUSHs (sv_2mortal (newSViv (req->result)));
160
161	if (req->type == REQ_OPEN)
162	{
163	/* convert fd to fh */
164	SV *fh;
165
166	PUTBACK;
167	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
168	SPAGAIN;
169
170	fh = SvREFCNT_inc (POPs);
171
172	PUSHMARK (SP);
173	XPUSHs (sv_2mortal (fh));
174	}
175
176	if (SvOK (req->callback))
177	{
178	PUTBACK;
179	call_sv (req->callback, G_VOID | G_EVAL);
180	SPAGAIN;
181
182	if (SvTRUE (ERRSV))
183	{
184	free_req (req);
185	croak (0);
186	}
187	}
188
189	LEAVE;
190
191	errno = errorno;
192	count++;
193	}
194
195	free_req (req);
196	}
197
198	return count;
199	}
200
201	static void *aio_proc(void *arg);
202
203	static void
204	start_thread (void)
205	{
206	sigset_t fullsigset, oldsigset;
207	pthread_t tid;
208	pthread_attr_t attr;
209
210	pthread_attr_init (&attr);
211	pthread_attr_setstacksize (&attr, STACKSIZE);
212	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
213
214	sigfillset (&fullsigset);
215	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
216
217	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
218	started++;
219
220	sigprocmask (SIG_SETMASK, &oldsigset, 0);
221	}
222
223	static void
224	send_req (aio_req req)
225	{
226	nreqs++;
227
228	pthread_mutex_lock (&reqlock);
229
230	req->next = 0;
231
232	if (reqe)
233	{
234	reqe->next = req;
235	reqe = req;
236	}
237	else
238	reqe = reqs = req;
239
240	pthread_cond_signal (&reqwait);
241	pthread_mutex_unlock (&reqlock);
242
243	if (nreqs > max_outstanding)
244	for (;;)
245	{
246	poll_cb ();
247
248	if (nreqs <= max_outstanding)
249	break;
250
251	poll_wait ();
252	}
253	}
254
255	static void
256	end_thread (void)
257	{
258	aio_req req;
259	Newz (0, req, 1, aio_cb);
260	req->type = REQ_QUIT;
261
262	send_req (req);
263	}
264
265	static void min_parallel (int nthreads)
266	{
267	while (nthreads > started)
268	start_thread ();
269	}
270
271	static void max_parallel (int nthreads)
272	{
273	int cur = started;
274
275	while (cur > nthreads)
276	{
277	end_thread ();
278	cur--;
279	}
280
281	while (started > nthreads)
282	{
283	poll_wait ();
284	poll_cb ();
285	}
286	}
287
288	static void create_pipe ()
289	{
290	if (pipe (respipe))
291	croak ("unable to initialize result pipe");
292
293	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
294	croak ("cannot set result pipe to nonblocking mode");
295
296	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
297	croak ("cannot set result pipe to nonblocking mode");
298	}
299
300	static void atfork_prepare (void)
301	{
302	pthread_mutex_lock (&reqlock);
303	pthread_mutex_lock (&reslock);
304	}
305
306	static void atfork_parent (void)
307	{
308	pthread_mutex_unlock (&reslock);
309	pthread_mutex_unlock (&reqlock);
310	}
311
312	static void atfork_child (void)
313	{
314	aio_req prv;
315
316	int restart = started;
317	started = 0;
318
319	while (reqs)
320	{
321	prv = reqs;
322	reqs = prv->next;
323	free_req (prv);
324	}
325
326	reqs = reqe = 0;
327
328	while (ress)
329	{
330	prv = ress;
331	ress = prv->next;
332	free_req (prv);
333	}
334
335	ress = rese = 0;
336
337	close (respipe [0]);
338	close (respipe [1]);
339	create_pipe ();
340
341	atfork_parent ();
342
343	min_parallel (restart);
344	}
345
346	/*****************************************************************************/
347	/* work around various missing functions */
348
349	#if !HAVE_PREADWRITE
350	# define pread aio_pread
351	# define pwrite aio_pwrite
352
353	/*
354	* make our pread/pwrite safe against themselves, but not against
355	* normal read/write by using a mutex. slows down execution a lot,
356	* but that's your problem, not mine.
357	*/
358	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;
359
360	static ssize_t
361	pread (int fd, void *buf, size_t count, off_t offset)
362	{
363	ssize_t res;
364	off_t ooffset;
365
366	pthread_mutex_lock (&iolock);
367	ooffset = lseek (fd, 0, SEEK_CUR);
368	lseek (fd, offset, SEEK_SET);
369	res = read (fd, buf, count);
370	lseek (fd, ooffset, SEEK_SET);
371	pthread_mutex_unlock (&iolock);
372
373	return res;
374	}
375
376	static ssize_t
377	pwrite (int fd, void *buf, size_t count, off_t offset)
378	{
379	ssize_t res;
380	off_t ooffset;
381
382	pthread_mutex_lock (&iolock);
383	ooffset = lseek (fd, 0, SEEK_CUR);
384	lseek (fd, offset, SEEK_SET);
385	res = write (fd, buf, count);
386	lseek (fd, offset, SEEK_SET);
387	pthread_mutex_unlock (&iolock);
388
389	return res;
390	}
391	#endif
392
393	#if !HAVE_FDATASYNC
394	# define fdatasync fsync
395	#endif
396
397	#if !HAVE_READAHEAD
398	# define readahead aio_readahead
399
400	static char readahead_buf[4096];
401
402	static ssize_t
403	readahead (int fd, off_t offset, size_t count)
404	{
405	while (count > 0)
406	{
407	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
408
409	pread (fd, readahead_buf, len, offset);
410	offset += len;
411	count -= len;
412	}
413
414	errno = 0;
415	}
416	#endif
417
418	/*****************************************************************************/
419
420	static void *
421	aio_proc (void *thr_arg)
422	{
423	aio_req req;
424	int type;
425
426	do
427	{
428	pthread_mutex_lock (&reqlock);
429
430	for (;;)
431	{
432	req = reqs;
433
434	if (reqs)
435	{
436	reqs = reqs->next;
437	if (!reqs) reqe = 0;
438	}
439
440	if (req)
441	break;
442
443	pthread_cond_wait (&reqwait, &reqlock);
444	}
445
446	pthread_mutex_unlock (&reqlock);
447
448	errno = 0; /* strictly unnecessary */
449
450	type = req->type;
451
452	switch (type)
453	{
454	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
455	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
456
457	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
458
459	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
460	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
461	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
462
463	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
464	case REQ_CLOSE: req->result = close (req->fd); break;
465	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
466	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
467	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
468
469	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
470	case REQ_FSYNC: req->result = fsync (req->fd); break;
471
472	case REQ_QUIT:
473	break;
474
475	default:
476	req->result = ENOSYS;
477	break;
478	}
479
480	req->errorno = errno;
481
482	pthread_mutex_lock (&reslock);
483
484	req->next = 0;
485
486	if (rese)
487	{
488	rese->next = req;
489	rese = req;
490	}	440	}
491	else	441	else
492	{	442	{
493	rese = ress = req;	443	sv_result = newSViv (req->result);
494		444	SvREADONLY_on (sv_result);
495	/* write a dummy byte to the pipe so fh becomes ready */
496	write (respipe [1], &respipe, 1);
497	}	445	}
498		446
499	pthread_mutex_unlock (&reslock);	447	switch (req->type)
		448	{
		449	case EIO_READDIR:
		450	{
		451	SV *rv = &PL_sv_undef;
		452
		453	if (req->result >= 0)
		454	{
		455	int i;
		456	char *names = (char *)req->ptr2;
		457	eio_dirent *ent = (eio_dirent *)req->ptr1; /* might be 0 */
		458	AV *av = newAV ();
		459
		460	av_extend (av, req->result - 1);
		461
		462	for (i = 0; i < req->result; ++i)
		463	{
		464	if (req->int1 & EIO_READDIR_DENTS)
		465	{
		466	SV *namesv = newSVpvn (names + ent->nameofs, ent->namelen);
		467
		468	if (req->int1 & EIO_READDIR_CUSTOM2)
		469	{
		470	static SV *sv_type [EIO_DT_MAX + 1]; /* type sv cache */
		471	AV *avent = newAV ();
		472
		473	av_extend (avent, 2);
		474
		475	if (!sv_type [ent->type])
		476	{
		477	sv_type [ent->type] = newSViv (ent->type);
		478	SvREADONLY_on (sv_type [ent->type]);
		479	}
		480
		481	av_store (avent, 0, namesv);
		482	av_store (avent, 1, SvREFCNT_inc (sv_type [ent->type]));
		483	av_store (avent, 2, IVSIZE >= 8 ? newSVuv (ent->inode) : newSVnv (ent->inode));
		484
		485	av_store (av, i, newRV_noinc ((SV *)avent));
		486	}
		487	else
		488	av_store (av, i, namesv);
		489
		490	++ent;
		491	}
		492	else
		493	{
		494	SV *name = newSVpv (names, 0);
		495	av_store (av, i, name);
		496	names += SvCUR (name) + 1;
		497	}
		498	}
		499
		500	rv = sv_2mortal (newRV_noinc ((SV *)av));
		501	}
		502
		503	PUSHs (rv);
		504
		505	if (req->int1 & EIO_READDIR_CUSTOM1)
		506	XPUSHs (sv_2mortal (newSViv (req->int1 & ~(EIO_READDIR_CUSTOM1 | EIO_READDIR_CUSTOM2))));
		507	}
		508	break;
		509
		510	case EIO_OPEN:
		511	{
		512	/* convert fd to fh */
		513	SV *fh = &PL_sv_undef;
		514
		515	if (req->result >= 0)
		516	{
		517	GV *gv = (GV *)sv_newmortal ();
		518	int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
		519	char sym [64];
		520	int symlen;
		521
		522	symlen = snprintf (sym, sizeof (sym), "fd#%d", (int)req->result);
		523	gv_init (gv, aio_stash, sym, symlen, 0);
		524
		525	symlen = snprintf (
		526	sym,
		527	sizeof (sym),
		528	"%s&=%d",
		529	flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
		530	(int)req->result
		531	);
		532
		533	if (do_open (gv, sym, symlen, 0, 0, 0, 0))
		534	fh = (SV *)gv;
		535	}
		536
		537	PUSHs (fh);
		538	}
		539	break;
		540
		541	case EIO_STATVFS:
		542	case EIO_FSTATVFS:
		543	{
		544	SV *rv = &PL_sv_undef;
		545
		546	if (req->result >= 0)
		547	{
		548	EIO_STRUCT_STATVFS *f = EIO_STATVFS_BUF (req);
		549	HV *hv = newHV ();
		550
		551	rv = sv_2mortal (newRV_noinc ((SV *)hv));
		552
		553	hv_store (hv, "bsize" , sizeof ("bsize" ) - 1, newSVval64 (f->f_bsize ), 0);
		554	hv_store (hv, "frsize" , sizeof ("frsize" ) - 1, newSVval64 (f->f_frsize ), 0);
		555	hv_store (hv, "blocks" , sizeof ("blocks" ) - 1, newSVval64 (f->f_blocks ), 0);
		556	hv_store (hv, "bfree" , sizeof ("bfree" ) - 1, newSVval64 (f->f_bfree ), 0);
		557	hv_store (hv, "bavail" , sizeof ("bavail" ) - 1, newSVval64 (f->f_bavail ), 0);
		558	hv_store (hv, "files" , sizeof ("files" ) - 1, newSVval64 (f->f_files ), 0);
		559	hv_store (hv, "ffree" , sizeof ("ffree" ) - 1, newSVval64 (f->f_ffree ), 0);
		560	hv_store (hv, "favail" , sizeof ("favail" ) - 1, newSVval64 (f->f_favail ), 0);
		561	hv_store (hv, "fsid" , sizeof ("fsid" ) - 1, newSVval64 (f->f_fsid ), 0);
		562	hv_store (hv, "flag" , sizeof ("flag" ) - 1, newSVval64 (f->f_flag ), 0);
		563	hv_store (hv, "namemax", sizeof ("namemax") - 1, newSVval64 (f->f_namemax), 0);
		564	}
		565
		566	PUSHs (rv);
		567	}
		568
		569	break;
		570
		571	case EIO_GROUP:
		572	req->int1 = 2; /* mark group as finished */
		573
		574	if (req->sv1)
		575	{
		576	int i;
		577	AV *av = (AV *)req->sv1;
		578
		579	EXTEND (SP, AvFILL (av) + 1);
		580	for (i = 0; i <= AvFILL (av); ++i)
		581	PUSHs (*av_fetch (av, i, 0));
		582	}
		583	break;
		584
		585	case EIO_NOP:
		586	case EIO_BUSY:
		587	break;
		588
		589	case EIO_READLINK:
		590	case EIO_REALPATH:
		591	if (req->result > 0)
		592	PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
		593	break;
		594
		595	case EIO_STAT:
		596	case EIO_LSTAT:
		597	case EIO_FSTAT:
		598	PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
		599	PL_laststatval = req->result;
		600	PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
		601	PUSHs (sv_result);
		602	break;
		603
		604	case EIO_READ:
		605	{
		606	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		607	*SvEND (req->sv2) = 0;
		608	SvPOK_only (req->sv2);
		609	SvSETMAGIC (req->sv2);
		610	PUSHs (sv_result);
		611	}
		612	break;
		613
		614	case EIO_DUP2: /* EIO_DUP2 actually means aio_close(), so fudge result value */
		615	if (req->result > 0)
		616	SvIV_set (sv_result, 0);
		617	/* FALLTHROUGH */
		618
		619	default:
		620	PUSHs (sv_result);
		621	break;
		622	}
		623
		624	errno = req->errorno;
		625
		626	PUTBACK;
		627	call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
		628	SPAGAIN;
		629
		630	if (expect_false (SvREFCNT (sv_result) != 1 || sv_result_cache))
		631	SvREFCNT_dec (sv_result);
		632	else
		633	sv_result_cache = sv_result;
		634
		635	FREETMPS;
		636	LEAVE;
		637
		638	PUTBACK;
500	}	639	}
501	while (type != REQ_QUIT);	640
		641	return !!SvTRUE (ERRSV);
		642	}
		643
		644	static void req_destroy (aio_req req)
		645	{
		646	if (req->self)
		647	{
		648	sv_unmagic (req->self, PERL_MAGIC_ext);
		649	SvREFCNT_dec (req->self);
		650	}
		651
		652	SvREFCNT_dec (req->sv1);
		653	SvREFCNT_dec (req->sv2);
		654	SvREFCNT_dec (req->callback);
		655
		656	Safefree (req);
		657	}
		658
		659	static void req_cancel_subs (aio_req grp)
		660	{
		661	aio_req sub;
		662
		663	if (grp->type != EIO_GROUP)
		664	return;
		665
		666	SvREFCNT_dec (grp->sv2);
		667	grp->sv2 = 0;
		668
		669	eio_grp_cancel (grp);
		670	}
		671
		672	static void create_respipe (void)
		673	{
		674	if (s_epipe_renew (&respipe))
		675	croak ("IO::AIO: unable to initialize result pipe");
		676	}
		677
		678	static void poll_wait (void)
		679	{
		680	while (eio_nreqs ())
		681	{
		682	int size;
		683
		684	X_LOCK (reslock);
		685	size = res_queue.size;
		686	X_UNLOCK (reslock);
		687
		688	if (size)
		689	return;
		690
		691	etp_maybe_start_thread ();
		692
		693	s_epipe_wait (&respipe);
		694	}
		695	}
		696
		697	static int poll_cb (void)
		698	{
		699	for (;;)
		700	{
		701	int res = eio_poll ();
		702
		703	if (res > 0)
		704	croak (0);
		705
		706	if (!max_outstanding || max_outstanding > eio_nreqs ())
		707	return res;
		708
		709	poll_wait ();
		710	}
		711	}
		712
		713	static void atfork_child (void)
		714	{
		715	create_respipe ();
		716	}
		717
		718	/*****************************************************************************/
		719
		720	#if !_POSIX_MAPPED_FILES
		721	# define mmap(addr,length,prot,flags,fd,offs) (errno = ENOSYS, -1)
		722	# define munmap(addr,length) (errno = ENOSYS, -1)
		723	#endif
		724
		725	#if !_POSIX_MEMORY_PROTECTION
		726	# define mprotect(addr,len,prot) (errno = ENOSYS, -1)
		727	# define PROT_NONE 0
		728	# define PROT_WRITE 0
		729	# define MAP_PRIVATE 0
		730	# define MAP_SHARED 0
		731	# define MAP_FIXED 0
		732	#endif
		733
		734	#define MMAP_MAGIC PERL_MAGIC_ext
		735
		736	static int mmap_free (pTHX_ SV *sv, MAGIC *mg)
		737	{
		738	int old_errno = errno;
		739	munmap (mg->mg_ptr, (size_t)mg->mg_obj);
		740	errno = old_errno;
		741
		742	mg->mg_obj = 0; /* just in case */
		743
		744	SvREADONLY_off (sv);
		745
		746	if (SvPVX (sv) != mg->mg_ptr)
		747	croak ("ERROR: IO::AIO::mmap-mapped scalar changed location, detected");
		748
		749	SvCUR_set (sv, 0);
		750	SvPVX (sv) = 0;
		751	SvOK_off (sv);
502		752
503	return 0;	753	return 0;
504	}	754	}
505		755
		756	static MGVTBL mmap_vtbl = {
		757	0, 0, 0, 0, mmap_free
		758	};
		759
		760	/*****************************************************************************/
		761
		762	static SV * get_cb (SV *cb_sv)
		763	{
		764	SvGETMAGIC (cb_sv);
		765	return SvOK (cb_sv) ? s_get_cv_croak (cb_sv) : 0;
		766	}
		767
506	#define dREQ \	768	#define dREQ \
		769	SV *cb_cv; \
507	aio_req req; \	770	aio_req req; \
		771	int req_pri = next_pri; \
		772	next_pri = EIO_PRI_DEFAULT; \
508	\	773	\
509	if (SvOK (callback) && !SvROK (callback)) \	774	cb_cv = get_cb (callback); \
510	croak ("clalback must be undef or of reference type"); \
511	\	775	\
512	Newz (0, req, 1, aio_cb); \	776	Newz (0, req, 1, eio_req); \
513	if (!req) \	777	if (!req) \
514	croak ("out of memory during aio_req allocation"); \	778	croak ("out of memory during eio_req allocation"); \
515	\	779	\
516	req->callback = newSVsv (callback);	780	req->callback = SvREFCNT_inc (cb_cv); \
517		781	req->pri = req_pri
		782
		783	#define REQ_SEND \
		784	PUTBACK; \
		785	req_submit (req); \
		786	SPAGAIN; \
		787	\
		788	if (GIMME_V != G_VOID) \
		789	XPUSHs (req_sv (req, aio_req_stash));
		790
518	MODULE = IO::AIO PACKAGE = IO::AIO	791	MODULE = IO::AIO PACKAGE = IO::AIO
519		792
520	PROTOTYPES: ENABLE	793	PROTOTYPES: ENABLE
521		794
522	BOOT:	795	BOOT:
523	{	796	{
		797	static const struct {
		798	const char *name;
		799	IV iv;
		800	} *civ, const_iv[] = {
		801	# define const_niv(name, value) { # name, (IV) value },
		802	# define const_iv(name) { # name, (IV) name },
		803	# define const_eio(name) { # name, (IV) EIO_ ## name },
		804	const_iv (EXDEV)
		805	const_iv (ENOSYS)
		806	const_iv (O_RDONLY)
		807	const_iv (O_WRONLY)
		808	const_iv (O_RDWR)
		809	const_iv (O_CREAT)
		810	const_iv (O_TRUNC)
		811	const_iv (O_EXCL)
		812	const_iv (O_APPEND)
		813
		814	const_iv (O_ASYNC)
		815	const_iv (O_DIRECT)
		816	const_iv (O_NOATIME)
		817
		818	const_iv (O_CLOEXEC)
		819	const_iv (O_NOCTTY)
		820	const_iv (O_NOFOLLOW)
		821	const_iv (O_NONBLOCK)
		822	const_iv (O_EXEC)
		823	const_iv (O_SEARCH)
		824	const_iv (O_DIRECTORY)
		825	const_iv (O_DSYNC)
		826	const_iv (O_RSYNC)
		827	const_iv (O_SYNC)
		828	const_iv (O_TTY_INIT)
		829
		830	const_iv (S_IFIFO)
		831	const_iv (S_IFCHR)
		832	const_iv (S_IFBLK)
		833	const_iv (S_IFLNK)
		834	const_iv (S_IFREG)
		835	const_iv (S_IFDIR)
		836	const_iv (S_IFWHT)
		837	const_iv (S_IFSOCK)
		838	const_iv (S_IFMT)
		839
		840	const_niv (FADV_NORMAL , POSIX_FADV_NORMAL)
		841	const_niv (FADV_SEQUENTIAL, POSIX_FADV_SEQUENTIAL)
		842	const_niv (FADV_RANDOM , POSIX_FADV_RANDOM)
		843	const_niv (FADV_NOREUSE , POSIX_FADV_NOREUSE)
		844	const_niv (FADV_WILLNEED , POSIX_FADV_WILLNEED)
		845	const_niv (FADV_DONTNEED , POSIX_FADV_DONTNEED)
		846
		847	const_niv (MADV_NORMAL , POSIX_MADV_NORMAL)
		848	const_niv (MADV_SEQUENTIAL, POSIX_MADV_SEQUENTIAL)
		849	const_niv (MADV_RANDOM , POSIX_MADV_RANDOM)
		850	const_niv (MADV_WILLNEED , POSIX_MADV_WILLNEED)
		851	const_niv (MADV_DONTNEED , POSIX_MADV_DONTNEED)
		852
		853	const_iv (ST_RDONLY)
		854	const_iv (ST_NOSUID)
		855	const_iv (ST_NODEV)
		856	const_iv (ST_NOEXEC)
		857	const_iv (ST_SYNCHRONOUS)
		858	const_iv (ST_MANDLOCK)
		859	const_iv (ST_WRITE)
		860	const_iv (ST_APPEND)
		861	const_iv (ST_IMMUTABLE)
		862	const_iv (ST_NOATIME)
		863	const_iv (ST_NODIRATIME)
		864	const_iv (ST_RELATIME)
		865
		866	const_iv (PROT_NONE)
		867	const_iv (PROT_EXEC)
		868	const_iv (PROT_READ)
		869	const_iv (PROT_WRITE)
		870
		871	/*const_iv (MAP_FIXED)*/
		872	const_iv (MAP_PRIVATE)
		873	const_iv (MAP_SHARED)
		874	const_iv (MAP_ANONYMOUS)
		875
		876	/* linuxish */
		877	const_iv (MAP_HUGETLB)
		878	const_iv (MAP_LOCKED)
		879	const_iv (MAP_NORESERVE)
		880	const_iv (MAP_POPULATE)
		881	const_iv (MAP_NONBLOCK)
		882
		883	const_eio (MCL_FUTURE)
		884	const_eio (MCL_CURRENT)
		885
		886	const_eio (MS_ASYNC)
		887	const_eio (MS_INVALIDATE)
		888	const_eio (MS_SYNC)
		889
		890	const_eio (MT_MODIFY)
		891
		892	const_eio (SYNC_FILE_RANGE_WAIT_BEFORE)
		893	const_eio (SYNC_FILE_RANGE_WRITE)
		894	const_eio (SYNC_FILE_RANGE_WAIT_AFTER)
		895
		896	const_eio (FALLOC_FL_KEEP_SIZE)
		897
		898	const_eio (READDIR_DENTS)
		899	const_eio (READDIR_DIRS_FIRST)
		900	const_eio (READDIR_STAT_ORDER)
		901	const_eio (READDIR_FOUND_UNKNOWN)
		902
		903	const_eio (DT_UNKNOWN)
		904	const_eio (DT_FIFO)
		905	const_eio (DT_CHR)
		906	const_eio (DT_DIR)
		907	const_eio (DT_BLK)
		908	const_eio (DT_REG)
		909	const_eio (DT_LNK)
		910	const_eio (DT_SOCK)
		911	const_eio (DT_WHT)
		912	};
		913
		914	aio_stash = gv_stashpv ("IO::AIO" , 1);
		915	aio_req_stash = gv_stashpv ("IO::AIO::REQ", 1);
		916	aio_grp_stash = gv_stashpv ("IO::AIO::GRP", 1);
		917
		918	for (civ = const_iv + sizeof (const_iv) / sizeof (const_iv [0]); civ-- > const_iv; )
		919	newCONSTSUB (aio_stash, (char *)civ->name, newSViv (civ->iv));
		920
		921	newCONSTSUB (aio_stash, "PAGESIZE", newSViv (PAGESIZE));
		922
524	create_pipe ();	923	create_respipe ();
525	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
526	}
527		924
		925	if (eio_init (want_poll, done_poll) < 0)
		926	croak ("IO::AIO: unable to initialise eio library");
		927
		928	/* atfork child called in fifo order, so before eio's handler */
		929	X_THREAD_ATFORK (0, 0, atfork_child);
		930	}
		931
528	void	932	void
529	min_parallel(nthreads)	933	max_poll_reqs (unsigned int nreqs)
530	int nthreads
531	PROTOTYPE: $	934	PROTOTYPE: $
		935	CODE:
		936	eio_set_max_poll_reqs (nreqs);
532		937
533	void	938	void
534	max_parallel(nthreads)	939	max_poll_time (double nseconds)
535	int nthreads
536	PROTOTYPE: $	940	PROTOTYPE: $
537
538	int
539	max_outstanding(nreqs)
540	int nreqs
541	PROTOTYPE: $
542	CODE:	941	CODE:
543	RETVAL = max_outstanding;	942	eio_set_max_poll_time (nseconds);
		943
		944	void
		945	min_parallel (unsigned int nthreads)
		946	PROTOTYPE: $
		947	CODE:
		948	eio_set_min_parallel (nthreads);
		949
		950	void
		951	max_parallel (unsigned int nthreads)
		952	PROTOTYPE: $
		953	CODE:
		954	eio_set_max_parallel (nthreads);
		955
		956	void
		957	max_idle (unsigned int nthreads)
		958	PROTOTYPE: $
		959	CODE:
		960	eio_set_max_idle (nthreads);
		961
		962	void
		963	idle_timeout (unsigned int seconds)
		964	PROTOTYPE: $
		965	CODE:
		966	eio_set_idle_timeout (seconds);
		967
		968	void
		969	max_outstanding (unsigned int maxreqs)
		970	PROTOTYPE: $
		971	CODE:
544	max_outstanding = nreqs;	972	max_outstanding = maxreqs;
545		973
546	void	974	void
547	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	975	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
548	SV * pathname
549	int flags
550	int mode
551	SV * callback
552	PROTOTYPE: $$$;$
553	CODE:	976	PPCODE:
554	{	977	{
555	dREQ;	978	dREQ;
556		979
557	req->type = REQ_OPEN;	980	req->type = EIO_OPEN;
558	req->data = newSVsv (pathname);	981	req->sv1 = newSVsv (pathname);
559	req->dataptr = SvPVbyte_nolen (req->data);	982	req->ptr1 = SvPVbyte_nolen (req->sv1);
560	req->fd = flags;	983	req->int1 = flags;
561	req->mode = mode;	984	req->int2 = mode;
562		985
563	send_req (req);	986	REQ_SEND;
564	}	987	}
565		988
566	void	989	void
567	aio_close(fh,callback=&PL_sv_undef)	990	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
568	SV * fh
569	SV * callback
570	PROTOTYPE: $;$
571	ALIAS:	991	ALIAS:
572	aio_close = REQ_CLOSE
573	aio_fsync = REQ_FSYNC	992	aio_fsync = EIO_FSYNC
574	aio_fdatasync = REQ_FDATASYNC	993	aio_fdatasync = EIO_FDATASYNC
575	CODE:	994	PPCODE:
576	{	995	{
		996	int fd = s_fileno_croak (fh, 0);
577	dREQ;	997	dREQ;
578		998
579	req->type = ix;	999	req->type = ix;
580	req->fh = newSVsv (fh);	1000	req->sv1 = newSVsv (fh);
581	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1001	req->int1 = fd;
582		1002
583	send_req (req);	1003	REQ_SEND (req);
584	}	1004	}
585		1005
586	void	1006	void
		1007	aio_sync_file_range (SV *fh, off_t offset, size_t nbytes, UV flags, SV *callback=&PL_sv_undef)
		1008	PPCODE:
		1009	{
		1010	int fd = s_fileno_croak (fh, 0);
		1011	dREQ;
		1012
		1013	req->type = EIO_SYNC_FILE_RANGE;
		1014	req->sv1 = newSVsv (fh);
		1015	req->int1 = fd;
		1016	req->offs = offset;
		1017	req->size = nbytes;
		1018	req->int2 = flags;
		1019
		1020	REQ_SEND (req);
		1021	}
		1022
		1023	void
		1024	aio_fallocate (SV *fh, int mode, off_t offset, size_t len, SV *callback=&PL_sv_undef)
		1025	PPCODE:
		1026	{
		1027	int fd = s_fileno_croak (fh, 0);
		1028	dREQ;
		1029
		1030	req->type = EIO_FALLOCATE;
		1031	req->sv1 = newSVsv (fh);
		1032	req->int1 = fd;
		1033	req->int2 = mode;
		1034	req->offs = offset;
		1035	req->size = len;
		1036
		1037	REQ_SEND (req);
		1038	}
		1039
		1040	void
		1041	aio_close (SV *fh, SV *callback=&PL_sv_undef)
		1042	PPCODE:
		1043	{
		1044	static int close_pipe = -1; /* dummy fd to close fds via dup2 */
		1045	int fd = s_fileno_croak (fh, 0);
		1046	dREQ;
		1047
		1048	if (close_pipe < 0)
		1049	{
		1050	int pipefd [2];
		1051
		1052	if (pipe (pipefd) < 0
		1053	|| close (pipefd [1]) < 0
		1054	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
		1055	abort (); /*D*/
		1056
		1057	close_pipe = pipefd [0];
		1058	}
		1059
		1060	req->type = EIO_DUP2;
		1061	req->int1 = close_pipe;
		1062	req->sv2 = newSVsv (fh);
		1063	req->int2 = fd;
		1064
		1065	REQ_SEND (req);
		1066	}
		1067
		1068	void
587	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1069	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
588	SV * fh
589	UV offset
590	IV length
591	SV * data
592	IV dataoffset
593	SV * callback
594	ALIAS:	1070	ALIAS:
595	aio_read = REQ_READ	1071	aio_read = EIO_READ
596	aio_write = REQ_WRITE	1072	aio_write = EIO_WRITE
597	PROTOTYPE: $$$$$;$
598	CODE:	1073	PPCODE:
599	{	1074	{
600	aio_req req;
601	STRLEN svlen;	1075	STRLEN svlen;
		1076	int fd = s_fileno_croak (fh, ix == EIO_WRITE);
602	char *svptr = SvPVbyte (data, svlen);	1077	char *svptr = SvPVbyte (data, svlen);
603		1078	UV len = SvUV (length);
604	SvUPGRADE (data, SVt_PV);
605	SvPOK_on (data);
606		1079
607	if (dataoffset < 0)	1080	if (dataoffset < 0)
608	dataoffset += svlen;	1081	dataoffset += svlen;
609		1082
610	if (dataoffset < 0 || dataoffset > svlen)	1083	if (dataoffset < 0 || dataoffset > svlen)
611	croak ("data offset outside of string");	1084	croak ("dataoffset outside of data scalar");
612		1085
613	if (ix == REQ_WRITE)	1086	if (ix == EIO_WRITE)
614	{	1087	{
615	/* write: check length and adjust. */	1088	/* write: check length and adjust. */
616	if (length < 0 || length + dataoffset > svlen)	1089	if (!SvOK (length) || len + dataoffset > svlen)
617	length = svlen - dataoffset;	1090	len = svlen - dataoffset;
618	}	1091	}
619	else	1092	else
620	{	1093	{
621	/* read: grow scalar as necessary */	1094	/* read: check type and grow scalar as necessary */
		1095	SvUPGRADE (data, SVt_PV);
622	svptr = SvGROW (data, length + dataoffset);	1096	svptr = SvGROW (data, len + dataoffset + 1);
623	}	1097	}
624
625	if (length < 0)
626	croak ("length must not be negative");
627		1098
628	{	1099	{
629	dREQ;	1100	dREQ;
630		1101
631	req->type = ix;	1102	req->type = ix;
632	req->fh = newSVsv (fh);	1103	req->sv1 = newSVsv (fh);
633	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1104	req->int1 = fd;
634	: IoOFP (sv_2io (fh)));	1105	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
635	req->offset = offset;	1106	req->size = len;
636	req->length = length;
637	req->data = SvREFCNT_inc (data);	1107	req->sv2 = SvREFCNT_inc (data);
638	req->dataptr = (char *)svptr + dataoffset;	1108	req->ptr2 = (char *)svptr + dataoffset;
		1109	req->stroffset = dataoffset;
639		1110
640	if (!SvREADONLY (data))	1111	if (!SvREADONLY (data))
641	{	1112	{
642	SvREADONLY_on (data);	1113	SvREADONLY_on (data);
643	req->data2ptr = (void *)data;	1114	req->flags |= FLAG_SV2_RO_OFF;
644	}	1115	}
645		1116
646	send_req (req);	1117	REQ_SEND;
647	}	1118	}
648	}	1119	}
649		1120
650	void	1121	void
651	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1122	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
652	SV * fh	1123	ALIAS:
653	UV offset	1124	aio_readlink = EIO_READLINK
654	IV length	1125	aio_realpath = EIO_REALPATH
655	SV * callback
656	PROTOTYPE: $$$;$
657	CODE:	1126	PPCODE:
658	{	1127	{
		1128	SV *data;
		1129	dREQ;
		1130
		1131	req->type = ix;
		1132	req->sv1 = newSVsv (path);
		1133	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1134
		1135	REQ_SEND;
		1136	}
		1137
		1138	void
		1139	aio_sendfile (SV *out_fh, SV *in_fh, off_t in_offset, size_t length, SV *callback=&PL_sv_undef)
		1140	PPCODE:
		1141	{
		1142	int ifd = s_fileno_croak (in_fh , 0);
		1143	int ofd = s_fileno_croak (out_fh, 1);
659	dREQ;	1144	dREQ;
660		1145
		1146	req->type = EIO_SENDFILE;
		1147	req->sv1 = newSVsv (out_fh);
		1148	req->int1 = ofd;
		1149	req->sv2 = newSVsv (in_fh);
		1150	req->int2 = ifd;
		1151	req->offs = in_offset;
		1152	req->size = length;
		1153
		1154	REQ_SEND;
		1155	}
		1156
		1157	void
		1158	aio_readahead (SV *fh, off_t offset, size_t length, SV *callback=&PL_sv_undef)
		1159	PPCODE:
		1160	{
		1161	int fd = s_fileno_croak (fh, 0);
		1162	dREQ;
		1163
661	req->type = REQ_READAHEAD;	1164	req->type = EIO_READAHEAD;
662	req->fh = newSVsv (fh);	1165	req->sv1 = newSVsv (fh);
663	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1166	req->int1 = fd;
664	req->offset = offset;	1167	req->offs = offset;
665	req->length = length;	1168	req->size = length;
666		1169
667	send_req (req);	1170	REQ_SEND;
668	}	1171	}
669		1172
670	void	1173	void
671	aio_stat(fh_or_path,callback=&PL_sv_undef)	1174	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
672	SV * fh_or_path
673	SV * callback
674	ALIAS:	1175	ALIAS:
675	aio_stat = REQ_STAT	1176	aio_stat = EIO_STAT
676	aio_lstat = REQ_LSTAT	1177	aio_lstat = EIO_LSTAT
		1178	aio_statvfs = EIO_STATVFS
677	CODE:	1179	PPCODE:
678	{	1180	{
679	dREQ;	1181	dREQ;
680		1182
681	New (0, req->statdata, 1, Stat_t);	1183	req->sv1 = newSVsv (fh_or_path);
682	if (!req->statdata)
683	{
684	free_req (req);
685	croak ("out of memory during aio_req->statdata allocation");
686	}
687		1184
688	if (SvPOK (fh_or_path))	1185	if (SvPOK (req->sv1))
689	{	1186	{
690	req->type = ix;	1187	req->type = ix;
691	req->data = newSVsv (fh_or_path);
692	req->dataptr = SvPVbyte_nolen (req->data);	1188	req->ptr1 = SvPVbyte_nolen (req->sv1);
693	}	1189	}
694	else	1190	else
695	{	1191	{
696	req->type = REQ_FSTAT;	1192	req->type = ix == EIO_STATVFS ? EIO_FSTATVFS : EIO_FSTAT;
697	req->fh = newSVsv (fh_or_path);
698	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1193	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
699	}	1194	}
700		1195
701	send_req (req);	1196	REQ_SEND;
702	}	1197	}
703		1198
		1199	UV
		1200	major (UV dev)
		1201	ALIAS:
		1202	minor = 1
		1203	CODE:
		1204	RETVAL = ix ? major (dev) : minor (dev);
		1205	OUTPUT:
		1206	RETVAL
		1207
		1208	UV
		1209	makedev (UV maj, UV min)
		1210	CODE:
		1211	RETVAL = makedev (maj, min);
		1212	OUTPUT:
		1213	RETVAL
		1214
704	void	1215	void
		1216	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		1217	PPCODE:
		1218	{
		1219	dREQ;
		1220
		1221	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		1222	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		1223	req->sv1 = newSVsv (fh_or_path);
		1224
		1225	if (SvPOK (req->sv1))
		1226	{
		1227	req->type = EIO_UTIME;
		1228	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1229	}
		1230	else
		1231	{
		1232	req->type = EIO_FUTIME;
		1233	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1234	}
		1235
		1236	REQ_SEND;
		1237	}
		1238
		1239	void
		1240	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		1241	PPCODE:
		1242	{
		1243	dREQ;
		1244
		1245	req->sv1 = newSVsv (fh_or_path);
		1246	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		1247
		1248	if (SvPOK (req->sv1))
		1249	{
		1250	req->type = EIO_TRUNCATE;
		1251	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1252	}
		1253	else
		1254	{
		1255	req->type = EIO_FTRUNCATE;
		1256	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1257	}
		1258
		1259	REQ_SEND;
		1260	}
		1261
		1262	void
		1263	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		1264	ALIAS:
		1265	aio_chmod = EIO_CHMOD
		1266	aio_mkdir = EIO_MKDIR
		1267	PPCODE:
		1268	{
		1269	dREQ;
		1270
		1271	req->int2 = mode;
		1272	req->sv1 = newSVsv (fh_or_path);
		1273
		1274	if (SvPOK (req->sv1))
		1275	{
		1276	req->type = ix;
		1277	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1278	}
		1279	else
		1280	{
		1281	req->type = EIO_FCHMOD;
		1282	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1283	}
		1284
		1285	REQ_SEND;
		1286	}
		1287
		1288	void
		1289	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		1290	PPCODE:
		1291	{
		1292	dREQ;
		1293
		1294	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		1295	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		1296	req->sv1 = newSVsv (fh_or_path);
		1297
		1298	if (SvPOK (req->sv1))
		1299	{
		1300	req->type = EIO_CHOWN;
		1301	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1302	}
		1303	else
		1304	{
		1305	req->type = EIO_FCHOWN;
		1306	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1307	}
		1308
		1309	REQ_SEND;
		1310	}
		1311
		1312	void
		1313	aio_readdirx (SV8 *pathname, IV flags, SV *callback=&PL_sv_undef)
		1314	PPCODE:
		1315	{
		1316	dREQ;
		1317
		1318	req->type = EIO_READDIR;
		1319	req->sv1 = newSVsv (pathname);
		1320	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1321	req->int1 = flags | EIO_READDIR_DENTS | EIO_READDIR_CUSTOM1;
		1322
		1323	if (flags & EIO_READDIR_DENTS)
		1324	req->int1 |= EIO_READDIR_CUSTOM2;
		1325
		1326	REQ_SEND;
		1327	}
		1328
		1329	void
705	aio_unlink(pathname,callback=&PL_sv_undef)	1330	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
706	SV * pathname
707	SV * callback
708	ALIAS:	1331	ALIAS:
709	aio_unlink = REQ_UNLINK	1332	aio_unlink = EIO_UNLINK
710	aio_rmdir = REQ_RMDIR	1333	aio_rmdir = EIO_RMDIR
		1334	aio_readdir = EIO_READDIR
711	CODE:	1335	PPCODE:
712	{	1336	{
713	dREQ;	1337	dREQ;
714		1338
715	req->type = ix;	1339	req->type = ix;
716	req->data = newSVsv (pathname);	1340	req->sv1 = newSVsv (pathname);
717	req->dataptr = SvPVbyte_nolen (req->data);	1341	req->ptr1 = SvPVbyte_nolen (req->sv1);
718
719	send_req (req);
720	}
721		1342
		1343	REQ_SEND;
		1344	}
		1345
722	void	1346	void
723	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1347	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
724	SV * oldpath	1348	ALIAS:
725	SV * newpath	1349	aio_link = EIO_LINK
726	SV * callback	1350	aio_symlink = EIO_SYMLINK
		1351	aio_rename = EIO_RENAME
727	CODE:	1352	PPCODE:
728	{	1353	{
729	dREQ;	1354	dREQ;
730		1355
731	req->type = REQ_SYMLINK;	1356	req->type = ix;
732	req->fh = newSVsv (oldpath);	1357	req->sv1 = newSVsv (oldpath);
733	req->data2ptr = SvPVbyte_nolen (req->fh);	1358	req->ptr1 = SvPVbyte_nolen (req->sv1);
734	req->data = newSVsv (newpath);	1359	req->sv2 = newSVsv (newpath);
735	req->dataptr = SvPVbyte_nolen (req->data);	1360	req->ptr2 = SvPVbyte_nolen (req->sv2);
736		1361
737	send_req (req);	1362	REQ_SEND;
738	}	1363	}
739		1364
740	void	1365	void
741	flush()	1366	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
742	PROTOTYPE:	1367	PPCODE:
		1368	{
		1369	dREQ;
		1370
		1371	req->type = EIO_MKNOD;
		1372	req->sv1 = newSVsv (pathname);
		1373	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1374	req->int2 = (mode_t)mode;
		1375	req->offs = dev;
		1376
		1377	REQ_SEND;
		1378	}
		1379
		1380	void
		1381	aio_mtouch (SV8 *data, IV offset = 0, SV *length = &PL_sv_undef, int flags = 0, SV *callback=&PL_sv_undef)
		1382	ALIAS:
		1383	aio_mtouch = EIO_MTOUCH
		1384	aio_msync = EIO_MSYNC
		1385	PPCODE:
		1386	{
		1387	STRLEN svlen;
		1388	char *svptr = SvPVbyte (data, svlen);
		1389	UV len = SvUV (length);
		1390
		1391	if (offset < 0)
		1392	offset += svlen;
		1393
		1394	if (offset < 0 || offset > svlen)
		1395	croak ("offset outside of scalar");
		1396
		1397	if (!SvOK (length) || len + offset > svlen)
		1398	len = svlen - offset;
		1399
		1400	{
		1401	dREQ;
		1402
		1403	req->type = ix;
		1404	req->sv2 = SvREFCNT_inc (data);
		1405	req->ptr2 = (char *)svptr + offset;
		1406	req->size = len;
		1407	req->int1 = flags;
		1408
		1409	REQ_SEND;
		1410	}
		1411	}
		1412
		1413	void
		1414	aio_mlock (SV8 *data, IV offset = 0, SV *length = &PL_sv_undef, SV *callback=&PL_sv_undef)
		1415	PPCODE:
		1416	{
		1417	STRLEN svlen;
		1418	char *svptr = SvPVbyte (data, svlen);
		1419	UV len = SvUV (length);
		1420
		1421	if (offset < 0)
		1422	offset += svlen;
		1423
		1424	if (offset < 0 || offset > svlen)
		1425	croak ("offset outside of scalar");
		1426
		1427	if (!SvOK (length) || len + offset > svlen)
		1428	len = svlen - offset;
		1429
		1430	{
		1431	dREQ;
		1432
		1433	req->type = EIO_MLOCK;
		1434	req->sv2 = SvREFCNT_inc (data);
		1435	req->ptr2 = (char *)svptr + offset;
		1436	req->size = len;
		1437
		1438	REQ_SEND;
		1439	}
		1440	}
		1441
		1442	void
		1443	aio_mlockall (IV flags, SV *callback=&PL_sv_undef)
		1444	PPCODE:
		1445	{
		1446	dREQ;
		1447
		1448	req->type = EIO_MLOCKALL;
		1449	req->int1 = flags;
		1450
		1451	REQ_SEND;
		1452	}
		1453
		1454	void
		1455	aio_busy (double delay, SV *callback=&PL_sv_undef)
		1456	PPCODE:
		1457	{
		1458	dREQ;
		1459
		1460	req->type = EIO_BUSY;
		1461	req->nv1 = delay < 0. ? 0. : delay;
		1462
		1463	REQ_SEND;
		1464	}
		1465
		1466	void
		1467	aio_group (SV *callback=&PL_sv_undef)
		1468	PPCODE:
		1469	{
		1470	dREQ;
		1471
		1472	req->type = EIO_GROUP;
		1473
		1474	req_submit (req);
		1475	XPUSHs (req_sv (req, aio_grp_stash));
		1476	}
		1477
		1478	void
		1479	aio_nop (SV *callback=&PL_sv_undef)
		1480	ALIAS:
		1481	aio_nop = EIO_NOP
		1482	aio_sync = EIO_SYNC
		1483	PPCODE:
		1484	{
		1485	dREQ;
		1486
		1487	req->type = ix;
		1488
		1489	REQ_SEND;
		1490	}
		1491
		1492	int
		1493	aioreq_pri (int pri = 0)
743	CODE:	1494	CODE:
		1495	RETVAL = next_pri;
		1496	if (items > 0)
		1497	{
		1498	if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
		1499	if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
		1500	next_pri = pri;
		1501	}
		1502	OUTPUT:
		1503	RETVAL
		1504
		1505	void
		1506	aioreq_nice (int nice = 0)
		1507	CODE:
		1508	nice = next_pri - nice;
		1509	if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
		1510	if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
		1511	next_pri = nice;
		1512
		1513	void
		1514	flush ()
		1515	CODE:
744	while (nreqs)	1516	while (eio_nreqs ())
745	{	1517	{
746	poll_wait ();	1518	poll_wait ();
747	poll_cb ();	1519	poll_cb ();
748	}	1520	}
749		1521
750	void	1522	int
751	poll()	1523	poll ()
752	PROTOTYPE:
753	CODE:	1524	CODE:
754	if (nreqs)
755	{
756	poll_wait ();	1525	poll_wait ();
757	poll_cb ();	1526	RETVAL = poll_cb ();
758	}
759
760	int
761	poll_fileno()
762	PROTOTYPE:
763	CODE:
764	RETVAL = respipe [0];
765	OUTPUT:	1527	OUTPUT:
766	RETVAL	1528	RETVAL
767		1529
768	int	1530	int
		1531	poll_fileno ()
		1532	CODE:
		1533	RETVAL = s_epipe_fd (&respipe);
		1534	OUTPUT:
		1535	RETVAL
		1536
		1537	int
769	poll_cb(...)	1538	poll_cb (...)
770	PROTOTYPE:	1539	PROTOTYPE:
771	CODE:	1540	CODE:
772	RETVAL = poll_cb ();	1541	RETVAL = poll_cb ();
773	OUTPUT:	1542	OUTPUT:
774	RETVAL	1543	RETVAL
775		1544
776	void	1545	void
777	poll_wait()	1546	poll_wait ()
778	PROTOTYPE:
779	CODE:	1547	CODE:
780	if (nreqs)
781	poll_wait ();	1548	poll_wait ();
782		1549
783	int	1550	int
784	nreqs()	1551	nreqs ()
785	PROTOTYPE:
786	CODE:	1552	CODE:
787	RETVAL = nreqs;	1553	RETVAL = eio_nreqs ();
788	OUTPUT:	1554	OUTPUT:
789	RETVAL	1555	RETVAL
790		1556
		1557	int
		1558	nready ()
		1559	CODE:
		1560	RETVAL = eio_nready ();
		1561	OUTPUT:
		1562	RETVAL
		1563
		1564	int
		1565	npending ()
		1566	CODE:
		1567	RETVAL = eio_npending ();
		1568	OUTPUT:
		1569	RETVAL
		1570
		1571	int
		1572	nthreads ()
		1573	CODE:
		1574	RETVAL = eio_nthreads ();
		1575	OUTPUT:
		1576	RETVAL
		1577
		1578	int
		1579	fadvise (aio_rfd fh, off_t offset, off_t length, IV advice)
		1580	CODE:
		1581	RETVAL = posix_fadvise (fh, offset, length, advice);
		1582	OUTPUT:
		1583	RETVAL
		1584
		1585	ssize_t
		1586	sendfile (aio_wfd ofh, aio_rfd ifh, off_t offset, size_t count)
		1587	CODE:
		1588	RETVAL = eio_sendfile_sync (ofh, ifh, offset, count);
		1589	OUTPUT:
		1590	RETVAL
		1591
		1592	void
		1593	mmap (SV *scalar, size_t length, int prot, int flags, SV *fh, off_t offset = 0)
		1594	PPCODE:
		1595	sv_unmagic (scalar, MMAP_MAGIC);
		1596	{
		1597	int fd = SvOK (fh) ? s_fileno_croak (fh, flags & PROT_WRITE) : -1;
		1598	void *addr = (void *)mmap (0, length, prot, flags, fd, offset);
		1599	if (addr == (void *)-1)
		1600	XSRETURN_NO;
		1601
		1602	sv_force_normal (scalar);
		1603
		1604	/* we store the length in mg_obj, as namlen is I32 :/ */
		1605	sv_magicext (scalar, 0, MMAP_MAGIC, &mmap_vtbl, (char *)addr, 0)
		1606	->mg_obj = (SV *)length;
		1607
		1608	SvUPGRADE (scalar, SVt_PV); /* nop... */
		1609
		1610	if (!(prot & PROT_WRITE))
		1611	SvREADONLY_on (scalar);
		1612
		1613	if (SvLEN (scalar))
		1614	Safefree (SvPVX (scalar));
		1615
		1616	SvPVX (scalar) = (char *)addr;
		1617	SvCUR_set (scalar, length);
		1618	SvLEN_set (scalar, 0);
		1619	SvPOK_only (scalar);
		1620
		1621	XSRETURN_YES;
		1622	}
		1623
		1624	void
		1625	munmap (SV *scalar)
		1626	CODE:
		1627	sv_unmagic (scalar, MMAP_MAGIC);
		1628
		1629	int
		1630	madvise (SV *scalar, off_t offset = 0, SV *length = &PL_sv_undef, IV advice_or_prot)
		1631	ALIAS:
		1632	mprotect = 1
		1633	CODE:
		1634	{
		1635	STRLEN svlen;
		1636	void *addr = SvPVbyte (scalar, svlen);
		1637	size_t len = SvUV (length);
		1638
		1639	if (offset < 0)
		1640	offset += svlen;
		1641
		1642	if (offset < 0 || offset > svlen)
		1643	croak ("offset outside of scalar");
		1644
		1645	if (!SvOK (length) || len + offset > svlen)
		1646	len = svlen - offset;
		1647
		1648	addr = (void *)(((intptr_t)addr) + offset);
		1649	eio_page_align (&addr, &len);
		1650
		1651	switch (ix)
		1652	{
		1653	case 0: RETVAL = posix_madvise (addr, len, advice_or_prot); break;
		1654	case 1: RETVAL = mprotect (addr, len, advice_or_prot); break;
		1655	}
		1656	}
		1657	OUTPUT:
		1658	RETVAL
		1659
		1660	int
		1661	munlock (SV *scalar, off_t offset = 0, SV *length = &PL_sv_undef)
		1662	CODE:
		1663	{
		1664	STRLEN svlen;
		1665	void *addr = SvPVbyte (scalar, svlen);
		1666	size_t len = SvUV (length);
		1667
		1668	if (offset < 0)
		1669	offset += svlen;
		1670
		1671	if (offset < 0 || offset > svlen)
		1672	croak ("offset outside of scalar");
		1673
		1674	if (!SvOK (length) || len + offset > svlen)
		1675	len = svlen - offset;
		1676
		1677	addr = (void *)(((intptr_t)addr) + offset);
		1678	eio_page_align (&addr, &len);
		1679	#if _POSIX_MEMLOCK_RANGE
		1680	RETVAL = munlock (addr, len);
		1681	#else
		1682	RETVAL = ((errno = ENOSYS), -1);
		1683	#endif
		1684	}
		1685	OUTPUT:
		1686	RETVAL
		1687
		1688	int
		1689	munlockall ()
		1690	CODE:
		1691	#if _POSIX_MEMLOCK
		1692	munlockall ();
		1693	#else
		1694	RETVAL = -1;
		1695	errno = ENOSYS;
		1696	#endif
		1697	OUTPUT:
		1698	RETVAL
		1699
		1700	void _on_next_submit (SV *cb)
		1701	CODE:
		1702	SvREFCNT_dec (on_next_submit);
		1703	on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
		1704
		1705	PROTOTYPES: DISABLE
		1706
		1707	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1708
		1709	void
		1710	cancel (aio_req_ornot req)
		1711	CODE:
		1712	eio_cancel (req);
		1713
		1714	void
		1715	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1716	PPCODE:
		1717	{
		1718	if (GIMME_V != G_VOID)
		1719	XPUSHs (req->callback ? sv_2mortal (newRV_inc (req->callback)) : &PL_sv_undef);
		1720
		1721	if (items > 1)
		1722	{
		1723	SV *cb_cv =get_cb (callback);
		1724
		1725	SvREFCNT_dec (req->callback);
		1726	req->callback = SvREFCNT_inc (cb_cv);
		1727	}
		1728	}
		1729
		1730	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1731
		1732	void
		1733	add (aio_req grp, ...)
		1734	PPCODE:
		1735	{
		1736	int i;
		1737
		1738	if (grp->int1 == 2)
		1739	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1740
		1741	for (i = 1; i < items; ++i )
		1742	{
		1743	aio_req req;
		1744
		1745	if (GIMME_V != G_VOID)
		1746	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1747
		1748	req = SvAIO_REQ (ST (i));
		1749
		1750	if (req)
		1751	eio_grp_add (grp, req);
		1752	}
		1753	}
		1754
		1755	void
		1756	cancel_subs (aio_req_ornot req)
		1757	CODE:
		1758	req_cancel_subs (req);
		1759
		1760	void
		1761	result (aio_req grp, ...)
		1762	CODE:
		1763	{
		1764	int i;
		1765	AV *av;
		1766
		1767	grp->errorno = errno;
		1768
		1769	av = newAV ();
		1770	av_extend (av, items - 1);
		1771
		1772	for (i = 1; i < items; ++i )
		1773	av_push (av, newSVsv (ST (i)));
		1774
		1775	SvREFCNT_dec (grp->sv1);
		1776	grp->sv1 = (SV *)av;
		1777	}
		1778
		1779	void
		1780	errno (aio_req grp, int errorno = errno)
		1781	CODE:
		1782	grp->errorno = errorno;
		1783
		1784	void
		1785	limit (aio_req grp, int limit)
		1786	CODE:
		1787	eio_grp_limit (grp, limit);
		1788
		1789	void
		1790	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1791	CODE:
		1792	{
		1793	SvREFCNT_dec (grp->sv2);
		1794	grp->sv2 = newSVsv (callback);
		1795	grp->feed = aio_grp_feed;
		1796
		1797	if (grp->int2 <= 0)
		1798	grp->int2 = 2;
		1799
		1800	eio_grp_limit (grp, grp->int2);
		1801	}
		1802

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