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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.15 by root, Sat Jul 23 18:19:56 2005 UTC vs.
Revision 1.148 by root, Wed Jun 17 01:14:48 2009 UTC

		1	#include "libeio/xthread.h"
		2
		3	#include <errno.h>
		4
1	#include "EXTERN.h"	5	#include "EXTERN.h"
2	#include "perl.h"	6	#include "perl.h"
3	#include "XSUB.h"	7	#include "XSUB.h"
4		8
		9	#include <stddef.h>
		10	#include <stdlib.h>
		11	#include <errno.h>
5	#include <sys/types.h>	12	#include <sys/types.h>
6	#include <sys/stat.h>	13	#include <sys/stat.h>
7
8	#include <unistd.h>	14	#include <limits.h>
9	#include <fcntl.h>	15	#include <fcntl.h>
10	#include <signal.h>
11	#include <sched.h>	16	#include <sched.h>
12	#if __linux	17
		18	/* perl namespace pollution */
		19	#undef VERSION
		20
		21	#ifdef _WIN32
		22
		23	# define EIO_STRUCT_DIRENT Direntry_t
		24	# undef malloc
		25	# undef free
		26
		27	// perl overrides all those nice win32 functions
		28	# undef open
		29	# undef read
		30	# undef write
		31	# undef send
		32	# undef recv
		33	# undef stat
		34	# undef fstat
		35	# define lstat stat
		36	# undef truncate
		37	# undef ftruncate
		38	# undef open
		39	# undef close
		40	# undef unlink
		41	# undef rmdir
		42	# undef rename
		43	# undef lseek
		44
		45	# define chown(a,b,c) (errno = ENOSYS, -1)
		46	# define fchown(a,b,c) (errno = ENOSYS, -1)
		47	# define fchmod(a,b) (errno = ENOSYS, -1)
		48	# define symlink(a,b) (errno = ENOSYS, -1)
		49	# define readlink(a,b,c) (errno = ENOSYS, -1)
		50	# define mknod(a,b,c) (errno = ENOSYS, -1)
		51	# define truncate(a,b) (errno = ENOSYS, -1)
		52	# define ftruncate(fd,o) chsize ((fd), (o))
		53	# define fsync(fd) _commit (fd)
		54	# define opendir(fd) (errno = ENOSYS, 0)
		55	# define readdir(fd) (errno = ENOSYS, -1)
		56	# define closedir(fd) (errno = ENOSYS, -1)
		57	# define mkdir(a,b) mkdir (a)
		58
		59	#else
		60
		61	# include <sys/time.h>
13	#include <sys/syscall.h>	62	# include <sys/select.h>
		63	# include <unistd.h>
		64	# include <utime.h>
		65	# include <signal.h>
		66	# define EIO_STRUCT_DIRENT struct dirent
		67
14	#endif	68	#endif
15		69
16	#include <pthread.h>	70	/* perl stupidly overrides readdir and maybe others */
		71	/* with thread-unsafe versions, imagine that :( */
		72	#undef readdir
		73	#undef opendir
		74	#undef closedir
17		75
18	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	76	#define EIO_STRUCT_STAT Stat_t
19	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */
20	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
21		77
22	#if __ia64	78	/* use NV for 32 bit perls as it allows larger offsets */
23	# define STACKSIZE 65536	79	#if IVSIZE >= 8
		80	# define VAL64 IV
		81	# define SvVAL64 SvIV
		82	# define newSVval64 newSViv
24	#else	83	#else
25	# define STACKSIZE 4096	84	# define VAL64 NV
		85	# define SvVAL64 SvNV
		86	# define newSVval64 newSVnv
26	#endif	87	#endif
27		88
		89	/*****************************************************************************/
		90
		91	#if __GNUC__ >= 3
		92	# define expect(expr,value) __builtin_expect ((expr),(value))
		93	#else
		94	# define expect(expr,value) (expr)
		95	#endif
		96
		97	#define expect_false(expr) expect ((expr) != 0, 0)
		98	#define expect_true(expr) expect ((expr) != 0, 1)
		99
		100	/*****************************************************************************/
		101
		102	static HV *stash;
		103	typedef SV SV8; /* byte-sv, used for argument-checking */
		104	typedef int aio_rfd; /* read file desriptor */
		105	typedef int aio_wfd; /* write file descriptor */
		106
		107	#define AIO_REQ_KLASS "IO::AIO::REQ"
		108	#define AIO_GRP_KLASS "IO::AIO::GRP"
		109
		110	#define EIO_REQ_MEMBERS \
		111	SV *callback; \
		112	SV *sv1, *sv2; \
		113	STRLEN stroffset; \
		114	SV *self;
		115
		116	#define EIO_NO_WRAPPERS 1
		117
		118	#include "libeio/eio.h"
		119
		120	#ifndef POSIX_FADV_NORMAL
		121	# define POSIX_FADV_NORMAL 0
		122	#endif
		123
		124	#ifndef POSIX_FADV_SEQUENTIAL
		125	# define POSIX_FADV_SEQUENTIAL 0
		126	#endif
		127
		128	#ifndef POSIX_FADV_RANDOM
		129	# define POSIX_FADV_RANDOM 0
		130	#endif
		131
		132	#ifndef POSIX_FADV_NOREUSE
		133	# define POSIX_FADV_NOREUSE 0
		134	#endif
		135
		136	#ifndef POSIX_FADV_WILLNEED
		137	# define POSIX_FADV_WILLNEED 0
		138	#endif
		139
		140	#ifndef POSIX_FADV_DONTNEED
		141	# define POSIX_FADV_DONTNEED 0
		142	#endif
		143
		144	static int req_invoke (eio_req *req);
		145	#define EIO_FINISH(req) req_invoke (req)
		146	static void req_destroy (eio_req *grp);
		147	#define EIO_DESTROY(req) req_destroy (req)
		148
28	enum {	149	enum {
29	REQ_QUIT,	150	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
30	REQ_OPEN, REQ_CLOSE,
31	REQ_READ, REQ_WRITE, REQ_READAHEAD,
32	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,
33	REQ_FSYNC, REQ_FDATASYNC,
34	};	151	};
35		152
36	typedef struct aio_cb {	153	#include "libeio/eio.c"
37	struct aio_cb *volatile next;
38		154
39	int type;
40
41	int fd;
42	off_t offset;
43	size_t length;
44	ssize_t result;
45	mode_t mode; /* open */
46	int errorno;
47	SV *data, *callback, *fh;
48	void *dataptr;
49	STRLEN dataoffset;
50
51	Stat_t *statdata;
52	} aio_cb;
53
54	typedef aio_cb *aio_req;	155	typedef eio_req *aio_req;
		156	typedef eio_req *aio_req_ornot;
55		157
56	static int started;	158	static SV *on_next_submit;
57	static volatile int nreqs;	159	static int next_pri = EIO_PRI_DEFAULT;
58	static int max_outstanding = 1<<30;	160	static int max_outstanding;
59	static int respipe [2];
60		161
61	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	162	static int respipe_osf [2], respipe [2] = { -1, -1 };
62	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
63	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
64		163
65	static volatile aio_req reqs, reqe; /* queue start, queue end */	164	static void req_destroy (aio_req req);
66	static volatile aio_req ress, rese; /* queue start, queue end */	165	static void req_cancel (aio_req req);
67		166
68	static void	167	static void want_poll (void)
69	poll_wait ()
70	{	168	{
71	if (nreqs && !ress)	169	/* write a dummy byte to the pipe so fh becomes ready */
		170	respipe_write (respipe_osf [1], (const void *)&respipe_osf, 1);
		171	}
		172
		173	static void done_poll (void)
		174	{
		175	/* read any signals sent by the worker threads */
		176	char buf [4];
		177	while (respipe_read (respipe [0], buf, 4) == 4)
		178	;
		179	}
		180
		181	/* must be called at most once */
		182	static SV *req_sv (aio_req req, const char *klass)
		183	{
		184	if (!req->self)
72	{	185	{
73	fd_set rfd;	186	req->self = (SV *)newHV ();
74	FD_ZERO(&rfd);	187	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
75	FD_SET(respipe [0], &rfd);
76
77	select (respipe [0] + 1, &rfd, 0, 0, 0);
78	}	188	}
79	}
80		189
81	static int	190	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
82	poll_cb ()	191	}
		192
		193	static aio_req SvAIO_REQ (SV *sv)
		194	{
		195	MAGIC *mg;
		196
		197	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		198	croak ("object of class " AIO_REQ_KLASS " expected");
		199
		200	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		201
		202	return mg ? (aio_req)mg->mg_ptr : 0;
		203	}
		204
		205	static void aio_grp_feed (aio_req grp)
		206	{
		207	if (grp->sv2 && SvOK (grp->sv2))
		208	{
		209	dSP;
		210
		211	ENTER;
		212	SAVETMPS;
		213	PUSHMARK (SP);
		214	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		215	PUTBACK;
		216	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		217	SPAGAIN;
		218	FREETMPS;
		219	LEAVE;
		220	}
		221	}
		222
		223	static void req_submit (eio_req *req)
		224	{
		225	eio_submit (req);
		226
		227	if (expect_false (on_next_submit))
		228	{
		229	dSP;
		230	SV *cb = sv_2mortal (on_next_submit);
		231
		232	on_next_submit = 0;
		233
		234	PUSHMARK (SP);
		235	PUTBACK;
		236	call_sv (cb, G_DISCARD | G_EVAL);
		237	}
		238	}
		239
		240	static int req_invoke (eio_req *req)
83	{	241	{
84	dSP;	242	dSP;
85	int count = 0;
86	aio_req req, prv;
87		243
88	pthread_mutex_lock (&reslock);	244	if (req->flags & FLAG_SV2_RO_OFF)
		245	SvREADONLY_off (req->sv2);
89		246
90	{	247	if (!EIO_CANCELLED (req) && req->callback)
91	/* read any signals sent by the worker threads */
92	char buf [32];
93	while (read (respipe [0], buf, 32) > 0)
94	;
95	}
96
97	req = ress;
98	ress = rese = 0;
99
100	pthread_mutex_unlock (&reslock);
101
102	while (req)
103	{	248	{
104	nreqs--;	249	ENTER;
		250	SAVETMPS;
		251	PUSHMARK (SP);
		252	EXTEND (SP, 1);
105		253
106	if (req->type == REQ_QUIT)	254	switch (req->type)
107	started--;
108	else
109	{	255	{
110	int errorno = errno;	256	case EIO_READDIR:
111	errno = req->errorno;
112
113	if (req->type == REQ_READ)
114	SvCUR_set (req->data, req->dataoffset
115	+ req->result > 0 ? req->result : 0);
116
117	if (req->data)
118	SvREFCNT_dec (req->data);
119
120	if (req->fh)
121	SvREFCNT_dec (req->fh);
122
123	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
124	{	257	{
125	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	258	SV *rv = &PL_sv_undef;
126	PL_laststatval = req->result;
127	PL_statcache = *(req->statdata);
128		259
129	Safefree (req->statdata);	260	if (req->result >= 0)
		261	{
		262	int i;
		263	char *names = (char *)req->ptr2;
		264	eio_dirent *ent = (eio_dirent *)req->ptr1; /* might be 0 */
		265	AV *av = newAV ();
		266
		267	av_extend (av, req->result - 1);
		268
		269	for (i = 0; i < req->result; ++i)
		270	{
		271	if (req->int1 & EIO_READDIR_DENTS)
		272	{
		273	SV *namesv = newSVpvn (names + ent->nameofs, ent->namelen);
		274
		275	if (req->int1 & EIO_READDIR_CUSTOM2)
		276	{
		277	static SV *sv_type [EIO_DT_MAX + 1]; /* type sv cache */
		278	AV *avent = newAV ();
		279
		280	av_extend (avent, 2);
		281
		282	if (!sv_type [ent->type])
		283	{
		284	sv_type [ent->type] = newSViv (ent->type);
		285	SvREADONLY_on (sv_type [ent->type]);
		286	}
		287
		288	av_store (avent, 0, namesv);
		289	av_store (avent, 1, SvREFCNT_inc (sv_type [ent->type]));
		290	av_store (avent, 2, IVSIZE >= 8 ? newSVuv (ent->inode) : newSVnv (ent->inode));
		291
		292	av_store (av, i, newRV_noinc ((SV *)avent));
		293	}
		294	else
		295	av_store (av, i, namesv);
		296
		297	++ent;
		298	}
		299	else
		300	{
		301	SV *name = newSVpv (names, 0);
		302	av_store (av, i, name);
		303	names += SvCUR (name) + 1;
		304	}
		305	}
		306
		307	rv = sv_2mortal (newRV_noinc ((SV *)av));
		308	}
		309
		310	PUSHs (rv);
		311
		312	if (req->int1 & EIO_READDIR_CUSTOM1)
		313	XPUSHs (sv_2mortal (newSViv (req->int1 & ~(EIO_READDIR_CUSTOM1 | EIO_READDIR_CUSTOM2))));
130	}	314	}
		315	break;
131		316
132	ENTER;	317	case EIO_OPEN:
133	PUSHMARK (SP);
134	XPUSHs (sv_2mortal (newSViv (req->result)));
135
136	if (req->type == REQ_OPEN)
137	{	318	{
138	/* convert fd to fh */	319	/* convert fd to fh */
139	SV *fh;	320	SV *fh = &PL_sv_undef;
140		321
141	PUTBACK;	322	if (req->result >= 0)
142	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	323	{
143	SPAGAIN;	324	GV *gv = (GV *)sv_newmortal ();
		325	int flags = req->int1 & (O_RDONLY | O_WRONLY | O_RDWR);
		326	char sym [64];
		327	int symlen;
		328
		329	symlen = snprintf (sym, sizeof (sym), "fd#%d", (int)req->result);
		330	gv_init (gv, stash, sym, symlen, 0);
144		331
145	fh = SvREFCNT_inc (POPs);	332	symlen = snprintf (
		333	sym,
		334	sizeof (sym),
		335	"%s&=%d",
		336	flags == O_RDONLY ? "<" : flags == O_WRONLY ? ">" : "+<",
		337	(int)req->result
		338	);
146		339
		340	if (do_open (gv, sym, symlen, 0, 0, 0, 0))
		341	fh = (SV *)gv;
		342	}
		343
147	PUSHMARK (SP);	344	PUSHs (fh);
148	XPUSHs (sv_2mortal (fh));
149	}	345	}
		346	break;
150		347
151	if (SvOK (req->callback))	348	case EIO_GROUP:
		349	req->int1 = 2; /* mark group as finished */
		350
		351	if (req->sv1)
		352	{
		353	int i;
		354	AV *av = (AV *)req->sv1;
		355
		356	EXTEND (SP, AvFILL (av) + 1);
		357	for (i = 0; i <= AvFILL (av); ++i)
		358	PUSHs (*av_fetch (av, i, 0));
		359	}
		360	break;
		361
		362	case EIO_NOP:
		363	case EIO_BUSY:
		364	break;
		365
		366	case EIO_READLINK:
		367	if (req->result > 0)
		368	PUSHs (sv_2mortal (newSVpvn (req->ptr2, req->result)));
		369	break;
		370
		371	case EIO_STAT:
		372	case EIO_LSTAT:
		373	case EIO_FSTAT:
		374	PL_laststype = req->type == EIO_LSTAT ? OP_LSTAT : OP_STAT;
		375	PL_laststatval = req->result;
		376	PL_statcache = *(EIO_STRUCT_STAT *)(req->ptr2);
		377	PUSHs (sv_2mortal (newSViv (req->result)));
		378	break;
		379
		380	case EIO_READ:
152	{	381	{
153	PUTBACK;	382	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
154	call_sv (req->callback, G_VOID | G_EVAL);	383	*SvEND (req->sv2) = 0;
155	SPAGAIN;	384	SvPOK_only (req->sv2);
		385	SvSETMAGIC (req->sv2);
		386	PUSHs (sv_2mortal (newSViv (req->result)));
156	}	387	}
157
158	LEAVE;
159
160	if (req->callback)
161	SvREFCNT_dec (req->callback);
162
163	errno = errorno;
164	count++;
165	}
166
167	prv = req;
168	req = req->next;
169	Safefree (prv);
170
171	/* TODO: croak on errors? */
172	}
173
174	return count;
175	}
176
177	static void *aio_proc(void *arg);
178
179	static void
180	start_thread (void)
181	{
182	sigset_t fullsigset, oldsigset;
183	pthread_t tid;
184	pthread_attr_t attr;
185
186	pthread_attr_init (&attr);
187	pthread_attr_setstacksize (&attr, STACKSIZE);
188	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
189
190	sigfillset (&fullsigset);
191	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
192
193	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
194	started++;
195
196	sigprocmask (SIG_SETMASK, &oldsigset, 0);
197	}
198
199	static void
200	send_req (aio_req req)
201	{
202	nreqs++;
203
204	pthread_mutex_lock (&reqlock);
205
206	req->next = 0;
207
208	if (reqe)
209	{
210	reqe->next = req;
211	reqe = req;
212	}
213	else
214	reqe = reqs = req;
215
216	pthread_cond_signal (&reqwait);
217	pthread_mutex_unlock (&reqlock);
218
219	while (nreqs > max_outstanding)
220	{
221	poll_wait ();
222	poll_cb ();
223	}
224	}
225
226	static void
227	end_thread (void)
228	{
229	aio_req req;
230	New (0, req, 1, aio_cb);
231	req->type = REQ_QUIT;
232
233	send_req (req);
234	}
235
236	static void *
237	aio_proc (void *thr_arg)
238	{
239	aio_req req;
240	int type;
241
242	do
243	{
244	pthread_mutex_lock (&reqlock);
245
246	for (;;)
247	{
248	req = reqs;
249
250	if (reqs)
251	{
252	reqs = reqs->next;
253	if (!reqs) reqe = 0;
254	}
255
256	if (req)
257	break;	388	break;
258		389
259	pthread_cond_wait (&reqwait, &reqlock);
260	}
261
262	pthread_mutex_unlock (&reqlock);
263
264	errno = 0; /* strictly unnecessary */
265
266	type = req->type;
267
268	switch (type)
269	{
270	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
271	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
272	#if SYS_readahead
273	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
274	#else
275	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
276	#endif
277
278	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
279	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
280	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
281
282	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
283	case REQ_CLOSE: req->result = close (req->fd); break;
284	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
285
286	case REQ_FSYNC: req->result = fsync (req->fd); break;
287	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
288
289	case REQ_QUIT:	390	case EIO_DUP2:
290	break;	391	if (req->result > 0)
		392	req->result = 0;
		393	/* FALLTHROUGH */
291		394
292	default:	395	default:
293	req->result = ENOSYS;	396	PUSHs (sv_2mortal (newSViv (req->result)));
294	break;	397	break;
295	}	398	}
296		399
297	req->errorno = errno;	400	errno = req->errorno;
298		401
299	pthread_mutex_lock (&reslock);	402	PUTBACK;
		403	call_sv (req->callback, G_VOID | G_EVAL | G_DISCARD);
		404	SPAGAIN;
300		405
301	req->next = 0;	406	FREETMPS;
		407	LEAVE;
302		408
303	if (rese)	409	PUTBACK;
304	{
305	rese->next = req;
306	rese = req;
307	}
308	else
309	{
310	rese = ress = req;
311
312	/* write a dummy byte to the pipe so fh becomes ready */
313	write (respipe [1], &respipe, 1);
314	}
315
316	pthread_mutex_unlock (&reslock);
317	}	410	}
318	while (type != REQ_QUIT);
319		411
		412	return !!SvTRUE (ERRSV);
		413	}
		414
		415	static void req_destroy (aio_req req)
		416	{
		417	if (req->self)
		418	{
		419	sv_unmagic (req->self, PERL_MAGIC_ext);
		420	SvREFCNT_dec (req->self);
		421	}
		422
		423	SvREFCNT_dec (req->sv1);
		424	SvREFCNT_dec (req->sv2);
		425	SvREFCNT_dec (req->callback);
		426
		427	Safefree (req);
		428	}
		429
		430	static void req_cancel_subs (aio_req grp)
		431	{
		432	aio_req sub;
		433
		434	if (grp->type != EIO_GROUP)
		435	return;
		436
		437	SvREFCNT_dec (grp->sv2);
		438	grp->sv2 = 0;
		439
		440	eio_grp_cancel (grp);
		441	}
		442
		443	#ifdef USE_SOCKETS_AS_HANDLES
		444	# define TO_SOCKET(x) (win32_get_osfhandle (x))
		445	#else
		446	# define TO_SOCKET(x) (x)
		447	#endif
		448
		449	static void
		450	create_respipe (void)
		451	{
		452	int old_readfd = respipe [0];
		453
		454	if (respipe [1] >= 0)
		455	respipe_close (TO_SOCKET (respipe [1]));
		456
		457	#ifdef _WIN32
		458	if (PerlSock_socketpair (AF_UNIX, SOCK_STREAM, 0, respipe))
		459	#else
		460	if (pipe (respipe))
		461	#endif
		462	croak ("unable to initialize result pipe");
		463
		464	if (old_readfd >= 0)
		465	{
		466	if (dup2 (TO_SOCKET (respipe [0]), TO_SOCKET (old_readfd)) < 0)
		467	croak ("unable to initialize result pipe(2)");
		468
		469	respipe_close (respipe [0]);
		470	respipe [0] = old_readfd;
		471	}
		472
		473	#ifdef _WIN32
		474	int arg = 1;
		475	if (ioctlsocket (TO_SOCKET (respipe [0]), FIONBIO, &arg)
		476	|| ioctlsocket (TO_SOCKET (respipe [1]), FIONBIO, &arg))
		477	#else
		478	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK)
		479	|| fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		480	#endif
		481	croak ("unable to initialize result pipe(3)");
		482
		483	respipe_osf [0] = TO_SOCKET (respipe [0]);
		484	respipe_osf [1] = TO_SOCKET (respipe [1]);
		485	}
		486
		487	static void poll_wait (void)
		488	{
		489	fd_set rfd;
		490
		491	while (eio_nreqs ())
		492	{
		493	int size;
		494
		495	X_LOCK (reslock);
		496	size = res_queue.size;
		497	X_UNLOCK (reslock);
		498
		499	if (size)
		500	return;
		501
		502	etp_maybe_start_thread ();
		503
		504	FD_ZERO (&rfd);
		505	FD_SET (respipe [0], &rfd);
		506
		507	PerlSock_select (respipe [0] + 1, &rfd, 0, 0, 0);
		508	}
		509	}
		510
		511	static int poll_cb (void)
		512	{
		513	for (;;)
		514	{
		515	int res = eio_poll ();
		516
		517	if (res > 0)
		518	croak (0);
		519
		520	if (!max_outstanding || max_outstanding > eio_nreqs ())
		521	return res;
		522
		523	poll_wait ();
		524	}
		525	}
		526
		527	static void atfork_child (void)
		528	{
		529	create_respipe ();
		530	}
		531
		532	static SV *
		533	get_cb (SV *cb_sv)
		534	{
		535	HV *st;
		536	GV *gvp;
		537	CV *cv;
		538
		539	if (!SvOK (cb_sv))
320	return 0;	540	return 0;
		541
		542	cv = sv_2cv (cb_sv, &st, &gvp, 0);
		543
		544	if (!cv)
		545	croak ("IO::AIO callback must be undef or a CODE reference");
		546
		547	return (SV *)cv;
		548	}
		549
		550	#define dREQ \
		551	SV *cb_cv; \
		552	aio_req req; \
		553	int req_pri = next_pri; \
		554	next_pri = EIO_PRI_DEFAULT; \
		555	\
		556	cb_cv = get_cb (callback); \
		557	\
		558	Newz (0, req, 1, eio_req); \
		559	if (!req) \
		560	croak ("out of memory during eio_req allocation"); \
		561	\
		562	req->callback = SvREFCNT_inc (cb_cv); \
		563	req->pri = req_pri
		564
		565	#define REQ_SEND \
		566	PUTBACK; \
		567	req_submit (req); \
		568	SPAGAIN; \
		569	\
		570	if (GIMME_V != G_VOID) \
		571	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		572
		573	static int
		574	extract_fd (SV *fh, int wr)
		575	{
		576	int fd = PerlIO_fileno (wr ? IoOFP (sv_2io (fh)) : IoIFP (sv_2io (fh)));
		577
		578	if (fd < 0)
		579	croak ("illegal fh argument, either not an OS file or read/write mode mismatch");
		580
		581	return fd;
321	}	582	}
322		583
323	MODULE = IO::AIO PACKAGE = IO::AIO	584	MODULE = IO::AIO PACKAGE = IO::AIO
324		585
325	PROTOTYPES: ENABLE	586	PROTOTYPES: ENABLE
326		587
327	BOOT:	588	BOOT:
328	{	589	{
329	if (pipe (respipe))	590	static const struct {
330	croak ("unable to initialize result pipe");	591	const char *name;
		592	IV iv;
		593	} *civ, const_iv[] = {
		594	# define const_iv(name, value) { # name, (IV) value },
		595	# define const_eio(name) { # name, (IV) EIO_ ## name },
		596	const_iv (EXDEV , EXDEV)
		597	const_iv (ENOSYS , ENOSYS)
		598	const_iv (O_RDONLY, O_RDONLY)
		599	const_iv (O_WRONLY, O_WRONLY)
		600	const_iv (O_CREAT , O_CREAT)
		601	const_iv (O_TRUNC , O_TRUNC)
		602	#ifndef _WIN32
		603	const_iv (S_IFIFO , S_IFIFO)
		604	#endif
		605	const_iv (FADV_NORMAL , POSIX_FADV_NORMAL)
		606	const_iv (FADV_SEQUENTIAL, POSIX_FADV_SEQUENTIAL)
		607	const_iv (FADV_RANDOM , POSIX_FADV_RANDOM)
		608	const_iv (FADV_NOREUSE , POSIX_FADV_NOREUSE)
		609	const_iv (FADV_WILLNEED , POSIX_FADV_WILLNEED)
		610	const_iv (FADV_DONTNEED , POSIX_FADV_DONTNEED)
331		611
332	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	612	const_eio (SYNC_FILE_RANGE_WAIT_BEFORE)
333	croak ("cannot set result pipe to nonblocking mode");	613	const_eio (SYNC_FILE_RANGE_WRITE)
		614	const_eio (SYNC_FILE_RANGE_WAIT_AFTER)
334		615
335	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	616	const_eio (READDIR_DENTS)
336	croak ("cannot set result pipe to nonblocking mode");	617	const_eio (READDIR_DIRS_FIRST)
337	}	618	const_eio (READDIR_STAT_ORDER)
		619	const_eio (READDIR_FOUND_UNKNOWN)
338		620
		621	const_eio (DT_UNKNOWN)
		622	const_eio (DT_FIFO)
		623	const_eio (DT_CHR)
		624	const_eio (DT_DIR)
		625	const_eio (DT_BLK)
		626	const_eio (DT_REG)
		627	const_eio (DT_LNK)
		628	const_eio (DT_SOCK)
		629	const_eio (DT_WHT)
		630	};
		631
		632	stash = gv_stashpv ("IO::AIO", 1);
		633
		634	for (civ = const_iv + sizeof (const_iv) / sizeof (const_iv [0]); civ-- > const_iv; )
		635	newCONSTSUB (stash, (char *)civ->name, newSViv (civ->iv));
		636
		637	create_respipe ();
		638
		639	if (eio_init (want_poll, done_poll) < 0)
		640	croak ("IO::AIO: unable to initialise eio library");
		641
		642	/* atfork child called in fifo order, so before eio's handler */
		643	X_THREAD_ATFORK (0, 0, atfork_child);
		644	}
		645
339	void	646	void
340	min_parallel(nthreads)	647	max_poll_reqs (int nreqs)
341	int nthreads
342	PROTOTYPE: $	648	PROTOTYPE: $
343	CODE:	649	CODE:
344	while (nthreads > started)	650	eio_set_max_poll_reqs (nreqs);
345	start_thread ();
346		651
347	void	652	void
348	max_parallel(nthreads)	653	max_poll_time (double nseconds)
349	int nthreads
350	PROTOTYPE: $	654	PROTOTYPE: $
351	CODE:	655	CODE:
		656	eio_set_max_poll_time (nseconds);
		657
		658	void
		659	min_parallel (int nthreads)
		660	PROTOTYPE: $
		661	CODE:
		662	eio_set_min_parallel (nthreads);
		663
		664	void
		665	max_parallel (int nthreads)
		666	PROTOTYPE: $
		667	CODE:
		668	eio_set_max_parallel (nthreads);
		669
		670	void
		671	max_idle (int nthreads)
		672	PROTOTYPE: $
		673	CODE:
		674	eio_set_max_idle (nthreads);
		675
		676	void
		677	max_outstanding (int maxreqs)
		678	PROTOTYPE: $
		679	CODE:
		680	max_outstanding = maxreqs;
		681
		682	void
		683	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
		684	PROTOTYPE: $$$;$
		685	PPCODE:
352	{	686	{
353	int cur = started;	687	dREQ;
354	while (cur > nthreads)	688
355	{	689	req->type = EIO_OPEN;
356	end_thread ();	690	req->sv1 = newSVsv (pathname);
		691	req->ptr1 = SvPVbyte_nolen (req->sv1);
		692	req->int1 = flags;
		693	req->int2 = mode;
		694
		695	REQ_SEND;
		696	}
		697
		698	void
		699	aio_fsync (SV *fh, SV *callback=&PL_sv_undef)
		700	PROTOTYPE: $;$
		701	ALIAS:
		702	aio_fsync = EIO_FSYNC
		703	aio_fdatasync = EIO_FDATASYNC
		704	PPCODE:
		705	{
		706	int fd = extract_fd (fh, 0);
		707	dREQ;
		708
		709	req->type = ix;
		710	req->sv1 = newSVsv (fh);
		711	req->int1 = fd;
		712
		713	REQ_SEND (req);
		714	}
		715
		716	void
		717	aio_sync_file_range (SV *fh, off_t offset, size_t nbytes, UV flags, SV *callback=&PL_sv_undef)
		718	PROTOTYPE: $$$$;$
		719	PPCODE:
		720	{
		721	int fd = extract_fd (fh, 0);
		722	dREQ;
		723
		724	req->type = EIO_SYNC_FILE_RANGE;
		725	req->sv1 = newSVsv (fh);
		726	req->int1 = fd;
		727	req->offs = offset;
		728	req->size = nbytes;
		729	req->int2 = flags;
		730
		731	REQ_SEND (req);
		732	}
		733
		734	void
		735	aio_close (SV *fh, SV *callback=&PL_sv_undef)
		736	PROTOTYPE: $;$
		737	PPCODE:
		738	{
		739	static int close_pipe = -1; /* dummy fd to close fds via dup2 */
		740	int fd = extract_fd (fh, 0);
		741	dREQ;
		742
		743	if (close_pipe < 0)
		744	{
		745	int pipefd [2];
		746
		747	if (pipe (pipefd) < 0
		748	|| close (pipefd [1]) < 0
		749	|| fcntl (pipefd [0], F_SETFD, FD_CLOEXEC) < 0)
		750	abort (); /*D*/
		751
		752	close_pipe = pipefd [0];
		753	}
		754
		755	req->type = EIO_DUP2;
		756	req->int1 = close_pipe;
		757	req->sv2 = newSVsv (fh);
		758	req->int2 = fd;
		759
		760	REQ_SEND (req);
		761	}
		762
		763	void
		764	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
		765	ALIAS:
		766	aio_read = EIO_READ
		767	aio_write = EIO_WRITE
		768	PROTOTYPE: $$$$$;$
		769	PPCODE:
		770	{
		771	STRLEN svlen;
		772	int fd = extract_fd (fh, ix == EIO_WRITE);
		773	char *svptr = SvPVbyte (data, svlen);
		774	UV len = SvUV (length);
		775
		776	if (dataoffset < 0)
		777	dataoffset += svlen;
		778
		779	if (dataoffset < 0 || dataoffset > svlen)
		780	croak ("dataoffset outside of data scalar");
		781
		782	if (ix == EIO_WRITE)
		783	{
		784	/* write: check length and adjust. */
		785	if (!SvOK (length) || len + dataoffset > svlen)
		786	len = svlen - dataoffset;
		787	}
		788	else
		789	{
		790	/* read: check type and grow scalar as necessary */
		791	SvUPGRADE (data, SVt_PV);
		792	svptr = SvGROW (data, len + dataoffset + 1);
		793	}
		794
		795	{
		796	dREQ;
		797
		798	req->type = ix;
		799	req->sv1 = newSVsv (fh);
		800	req->int1 = fd;
		801	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		802	req->size = len;
		803	req->sv2 = SvREFCNT_inc (data);
		804	req->ptr2 = (char *)svptr + dataoffset;
		805	req->stroffset = dataoffset;
		806
		807	if (!SvREADONLY (data))
357	cur--;	808	{
		809	SvREADONLY_on (data);
		810	req->flags |= FLAG_SV2_RO_OFF;
358	}	811	}
359		812
360	while (started > nthreads)	813	REQ_SEND;
		814	}
		815	}
		816
		817	void
		818	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		819	PROTOTYPE: $$;$
		820	PPCODE:
		821	{
		822	SV *data;
		823	dREQ;
		824
		825	req->type = EIO_READLINK;
		826	req->sv1 = newSVsv (path);
		827	req->ptr1 = SvPVbyte_nolen (req->sv1);
		828
		829	REQ_SEND;
		830	}
		831
		832	void
		833	aio_sendfile (SV *out_fh, SV *in_fh, off_t in_offset, size_t length, SV *callback=&PL_sv_undef)
		834	PROTOTYPE: $$$$;$
		835	PPCODE:
		836	{
		837	int ifd = extract_fd (in_fh , 0);
		838	int ofd = extract_fd (out_fh, 0);
		839	dREQ;
		840
		841	req->type = EIO_SENDFILE;
		842	req->sv1 = newSVsv (out_fh);
		843	req->int1 = ofd;
		844	req->sv2 = newSVsv (in_fh);
		845	req->int2 = ifd;
		846	req->offs = in_offset;
		847	req->size = length;
		848
		849	REQ_SEND;
		850	}
		851
		852	void
		853	aio_readahead (SV *fh, off_t offset, size_t length, SV *callback=&PL_sv_undef)
		854	PROTOTYPE: $$$;$
		855	PPCODE:
		856	{
		857	int fd = extract_fd (fh, 0);
		858	dREQ;
		859
		860	req->type = EIO_READAHEAD;
		861	req->sv1 = newSVsv (fh);
		862	req->int1 = fd;
		863	req->offs = offset;
		864	req->size = length;
		865
		866	REQ_SEND;
		867	}
		868
		869	void
		870	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
		871	ALIAS:
		872	aio_stat = EIO_STAT
		873	aio_lstat = EIO_LSTAT
		874	PPCODE:
		875	{
		876	dREQ;
		877
		878	req->sv1 = newSVsv (fh_or_path);
		879
		880	if (SvPOK (req->sv1))
		881	{
		882	req->type = ix;
		883	req->ptr1 = SvPVbyte_nolen (req->sv1);
		884	}
		885	else
		886	{
		887	req->type = EIO_FSTAT;
		888	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		889	}
		890
		891	REQ_SEND;
		892	}
		893
		894	void
		895	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		896	PPCODE:
		897	{
		898	dREQ;
		899
		900	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		901	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		902	req->sv1 = newSVsv (fh_or_path);
		903
		904	if (SvPOK (req->sv1))
		905	{
		906	req->type = EIO_UTIME;
		907	req->ptr1 = SvPVbyte_nolen (req->sv1);
		908	}
		909	else
		910	{
		911	req->type = EIO_FUTIME;
		912	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		913	}
		914
		915	REQ_SEND;
		916	}
		917
		918	void
		919	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		920	PPCODE:
		921	{
		922	dREQ;
		923
		924	req->sv1 = newSVsv (fh_or_path);
		925	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		926
		927	if (SvPOK (req->sv1))
		928	{
		929	req->type = EIO_TRUNCATE;
		930	req->ptr1 = SvPVbyte_nolen (req->sv1);
		931	}
		932	else
		933	{
		934	req->type = EIO_FTRUNCATE;
		935	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		936	}
		937
		938	REQ_SEND;
		939	}
		940
		941	void
		942	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		943	ALIAS:
		944	aio_chmod = EIO_CHMOD
		945	aio_mkdir = EIO_MKDIR
		946	PPCODE:
		947	{
		948	dREQ;
		949
		950	req->int2 = mode;
		951	req->sv1 = newSVsv (fh_or_path);
		952
		953	if (SvPOK (req->sv1))
		954	{
		955	req->type = ix;
		956	req->ptr1 = SvPVbyte_nolen (req->sv1);
		957	}
		958	else
		959	{
		960	req->type = EIO_FCHMOD;
		961	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		962	}
		963
		964	REQ_SEND;
		965	}
		966
		967	void
		968	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		969	PPCODE:
		970	{
		971	dREQ;
		972
		973	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		974	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		975	req->sv1 = newSVsv (fh_or_path);
		976
		977	if (SvPOK (req->sv1))
		978	{
		979	req->type = EIO_CHOWN;
		980	req->ptr1 = SvPVbyte_nolen (req->sv1);
		981	}
		982	else
		983	{
		984	req->type = EIO_FCHOWN;
		985	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		986	}
		987
		988	REQ_SEND;
		989	}
		990
		991	void
		992	aio_readdirx (SV8 *pathname, IV flags, SV *callback=&PL_sv_undef)
		993	PPCODE:
		994	{
		995	dREQ;
		996
		997	req->type = EIO_READDIR;
		998	req->sv1 = newSVsv (pathname);
		999	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1000	req->int1 = flags | EIO_READDIR_DENTS | EIO_READDIR_CUSTOM1;
		1001
		1002	if (flags & EIO_READDIR_DENTS)
		1003	req->int1 |= EIO_READDIR_CUSTOM2;
		1004
		1005	REQ_SEND;
		1006	}
		1007
		1008	void
		1009	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
		1010	ALIAS:
		1011	aio_unlink = EIO_UNLINK
		1012	aio_rmdir = EIO_RMDIR
		1013	aio_readdir = EIO_READDIR
		1014	PPCODE:
		1015	{
		1016	dREQ;
		1017
		1018	req->type = ix;
		1019	req->sv1 = newSVsv (pathname);
		1020	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1021
		1022	REQ_SEND;
		1023	}
		1024
		1025	void
		1026	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
		1027	ALIAS:
		1028	aio_link = EIO_LINK
		1029	aio_symlink = EIO_SYMLINK
		1030	aio_rename = EIO_RENAME
		1031	PPCODE:
		1032	{
		1033	dREQ;
		1034
		1035	req->type = ix;
		1036	req->sv1 = newSVsv (oldpath);
		1037	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1038	req->sv2 = newSVsv (newpath);
		1039	req->ptr2 = SvPVbyte_nolen (req->sv2);
		1040
		1041	REQ_SEND;
		1042	}
		1043
		1044	void
		1045	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
		1046	PPCODE:
		1047	{
		1048	dREQ;
		1049
		1050	req->type = EIO_MKNOD;
		1051	req->sv1 = newSVsv (pathname);
		1052	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1053	req->int2 = (mode_t)mode;
		1054	req->offs = dev;
		1055
		1056	REQ_SEND;
		1057	}
		1058
		1059	void
		1060	aio_busy (double delay, SV *callback=&PL_sv_undef)
		1061	PPCODE:
		1062	{
		1063	dREQ;
		1064
		1065	req->type = EIO_BUSY;
		1066	req->nv1 = delay < 0. ? 0. : delay;
		1067
		1068	REQ_SEND;
		1069	}
		1070
		1071	void
		1072	aio_group (SV *callback=&PL_sv_undef)
		1073	PROTOTYPE: ;$
		1074	PPCODE:
		1075	{
		1076	dREQ;
		1077
		1078	req->type = EIO_GROUP;
		1079
		1080	req_submit (req);
		1081	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1082	}
		1083
		1084	void
		1085	aio_nop (SV *callback=&PL_sv_undef)
		1086	ALIAS:
		1087	aio_nop = EIO_NOP
		1088	aio_sync = EIO_SYNC
		1089	PPCODE:
		1090	{
		1091	dREQ;
		1092
		1093	req->type = ix;
		1094
		1095	REQ_SEND;
		1096	}
		1097
		1098	int
		1099	aioreq_pri (int pri = 0)
		1100	PROTOTYPE: ;$
		1101	CODE:
		1102	RETVAL = next_pri;
		1103	if (items > 0)
		1104	{
		1105	if (pri < EIO_PRI_MIN) pri = EIO_PRI_MIN;
		1106	if (pri > EIO_PRI_MAX) pri = EIO_PRI_MAX;
		1107	next_pri = pri;
		1108	}
		1109	OUTPUT:
		1110	RETVAL
		1111
		1112	void
		1113	aioreq_nice (int nice = 0)
		1114	CODE:
		1115	nice = next_pri - nice;
		1116	if (nice < EIO_PRI_MIN) nice = EIO_PRI_MIN;
		1117	if (nice > EIO_PRI_MAX) nice = EIO_PRI_MAX;
		1118	next_pri = nice;
		1119
		1120	void
		1121	flush ()
		1122	PROTOTYPE:
		1123	CODE:
		1124	while (eio_nreqs ())
361	{	1125	{
362	poll_wait ();	1126	poll_wait ();
363	poll_cb ();	1127	poll_cb ();
364	}	1128	}
365	}
366		1129
367	int	1130	int
368	max_outstanding(nreqs)
369	int nreqs
370	PROTOTYPE: $
371	CODE:
372	RETVAL = max_outstanding;
373	max_outstanding = nreqs;
374
375	void
376	aio_open(pathname,flags,mode,callback=&PL_sv_undef)
377	SV * pathname
378	int flags
379	int mode
380	SV * callback
381	PROTOTYPE: $$$;$
382	CODE:
383	{
384	aio_req req;
385
386	Newz (0, req, 1, aio_cb);
387
388	if (!req)
389	croak ("out of memory during aio_req allocation");
390
391	req->type = REQ_OPEN;
392	req->data = newSVsv (pathname);
393	req->dataptr = SvPV_nolen (req->data);
394	req->fd = flags;
395	req->mode = mode;
396	req->callback = SvREFCNT_inc (callback);
397
398	send_req (req);
399	}
400
401	void
402	aio_close(fh,callback=&PL_sv_undef)
403	SV * fh
404	SV * callback
405	PROTOTYPE: $;$
406	ALIAS:
407	aio_close = REQ_CLOSE
408	aio_fsync = REQ_FSYNC
409	aio_fdatasync = REQ_FDATASYNC
410	CODE:
411	{
412	aio_req req;
413
414	Newz (0, req, 1, aio_cb);
415
416	if (!req)
417	croak ("out of memory during aio_req allocation");
418
419	req->type = ix;
420	req->fh = newSVsv (fh);
421	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
422	req->callback = SvREFCNT_inc (callback);
423
424	send_req (req);
425	}
426
427	void
428	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
429	SV * fh
430	UV offset
431	IV length
432	SV * data
433	IV dataoffset
434	SV * callback
435	ALIAS:
436	aio_read = REQ_READ
437	aio_write = REQ_WRITE
438	PROTOTYPE: $$$$$;$
439	CODE:
440	{
441	aio_req req;
442	STRLEN svlen;
443	char *svptr = SvPV (data, svlen);
444
445	SvUPGRADE (data, SVt_PV);
446	SvPOK_on (data);
447
448	if (dataoffset < 0)
449	dataoffset += svlen;
450
451	if (dataoffset < 0 || dataoffset > svlen)
452	croak ("data offset outside of string");
453
454	if (ix == REQ_WRITE)
455	{
456	/* write: check length and adjust. */
457	if (length < 0 || length + dataoffset > svlen)
458	length = svlen - dataoffset;
459	}
460	else
461	{
462	/* read: grow scalar as necessary */
463	svptr = SvGROW (data, length + dataoffset);
464	}
465
466	if (length < 0)
467	croak ("length must not be negative");
468
469	Newz (0, req, 1, aio_cb);
470
471	if (!req)
472	croak ("out of memory during aio_req allocation");
473
474	req->type = ix;
475	req->fh = newSVsv (fh);
476	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
477	: IoOFP (sv_2io (fh)));
478	req->offset = offset;
479	req->length = length;
480	req->data = SvREFCNT_inc (data);
481	req->dataptr = (char *)svptr + dataoffset;
482	req->callback = SvREFCNT_inc (callback);
483
484	send_req (req);
485	}
486
487	void
488	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
489	SV * fh
490	UV offset
491	IV length
492	SV * callback
493	PROTOTYPE: $$$;$
494	CODE:
495	{
496	aio_req req;
497
498	if (length < 0)
499	croak ("length must not be negative");
500
501	Newz (0, req, 1, aio_cb);
502
503	if (!req)
504	croak ("out of memory during aio_req allocation");
505
506	req->type = REQ_READAHEAD;
507	req->fh = newSVsv (fh);
508	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
509	req->offset = offset;
510	req->length = length;
511	req->callback = SvREFCNT_inc (callback);
512
513	send_req (req);
514	}
515
516	void
517	aio_stat(fh_or_path,callback=&PL_sv_undef)
518	SV * fh_or_path
519	SV * callback
520	ALIAS:
521	aio_stat = REQ_STAT
522	aio_lstat = REQ_LSTAT
523	CODE:
524	{
525	aio_req req;
526
527	Newz (0, req, 1, aio_cb);
528
529	if (!req)
530	croak ("out of memory during aio_req allocation");
531
532	New (0, req->statdata, 1, Stat_t);
533
534	if (!req->statdata)
535	croak ("out of memory during aio_req->statdata allocation");
536
537	if (SvPOK (fh_or_path))
538	{
539	req->type = ix;
540	req->data = newSVsv (fh_or_path);
541	req->dataptr = SvPV_nolen (req->data);
542	}
543	else
544	{
545	req->type = REQ_FSTAT;
546	req->fh = newSVsv (fh_or_path);
547	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
548	}
549
550	req->callback = SvREFCNT_inc (callback);
551
552	send_req (req);
553	}
554
555	void
556	aio_unlink(pathname,callback=&PL_sv_undef)
557	SV * pathname
558	SV * callback
559	CODE:
560	{
561	aio_req req;
562
563	Newz (0, req, 1, aio_cb);
564
565	if (!req)
566	croak ("out of memory during aio_req allocation");
567
568	req->type = REQ_UNLINK;
569	req->data = newSVsv (pathname);
570	req->dataptr = SvPV_nolen (req->data);
571	req->callback = SvREFCNT_inc (callback);
572
573	send_req (req);
574	}
575
576	void
577	flush()
578	PROTOTYPE:
579	CODE:
580	while (nreqs)
581	{
582	poll_wait ();
583	poll_cb ();
584	}
585
586	void
587	poll()	1131	poll()
588	PROTOTYPE:	1132	PROTOTYPE:
589	CODE:	1133	CODE:
590	if (nreqs)
591	{
592	poll_wait ();	1134	poll_wait ();
593	poll_cb ();	1135	RETVAL = poll_cb ();
594	}	1136	OUTPUT:
		1137	RETVAL
595		1138
596	int	1139	int
597	poll_fileno()	1140	poll_fileno()
598	PROTOTYPE:	1141	PROTOTYPE:
599	CODE:	1142	CODE:
…		…
611		1154
612	void	1155	void
613	poll_wait()	1156	poll_wait()
614	PROTOTYPE:	1157	PROTOTYPE:
615	CODE:	1158	CODE:
616	if (nreqs)
617	poll_wait ();	1159	poll_wait ();
618		1160
619	int	1161	int
620	nreqs()	1162	nreqs()
621	PROTOTYPE:	1163	PROTOTYPE:
622	CODE:	1164	CODE:
623	RETVAL = nreqs;	1165	RETVAL = eio_nreqs ();
624	OUTPUT:	1166	OUTPUT:
625	RETVAL	1167	RETVAL
626		1168
		1169	int
		1170	nready()
		1171	PROTOTYPE:
		1172	CODE:
		1173	RETVAL = eio_nready ();
		1174	OUTPUT:
		1175	RETVAL
		1176
		1177	int
		1178	npending()
		1179	PROTOTYPE:
		1180	CODE:
		1181	RETVAL = eio_npending ();
		1182	OUTPUT:
		1183	RETVAL
		1184
		1185	int
		1186	nthreads()
		1187	PROTOTYPE:
		1188	CODE:
		1189	RETVAL = eio_nthreads ();
		1190	OUTPUT:
		1191	RETVAL
		1192
		1193	int
		1194	fadvise (aio_rfd fh, off_t offset, off_t length, IV advice)
		1195	PROTOTYPE: $$$$
		1196	CODE:
		1197	{
		1198	#if _XOPEN_SOURCE >= 600
		1199	RETVAL = posix_fadvise (fh, offset, length, advice);
		1200	#else
		1201	RETVAL = errno = ENOSYS;
		1202	#endif
		1203	}
		1204	OUTPUT:
		1205	RETVAL
		1206
		1207	ssize_t
		1208	sendfile (aio_wfd ofh, aio_rfd ifh, off_t offset, size_t count)
		1209	PROTOTYPE: $$$$
		1210	CODE:
		1211	eio_sendfile_sync (ofh, ifh, offset, count);
		1212
		1213	void _on_next_submit (SV *cb)
		1214	CODE:
		1215	SvREFCNT_dec (on_next_submit);
		1216	on_next_submit = SvOK (cb) ? newSVsv (cb) : 0;
		1217
		1218	PROTOTYPES: DISABLE
		1219
		1220	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1221
		1222	void
		1223	cancel (aio_req_ornot req)
		1224	CODE:
		1225	eio_cancel (req);
		1226
		1227	void
		1228	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1229	PPCODE:
		1230	{
		1231	if (GIMME_V != G_VOID)
		1232	XPUSHs (req->callback ? sv_2mortal (newRV_inc (req->callback)) : &PL_sv_undef);
		1233
		1234	if (items > 1)
		1235	{
		1236	SV *cb_cv = get_cb (callback);
		1237
		1238	SvREFCNT_dec (req->callback);
		1239	req->callback = SvREFCNT_inc (cb_cv);
		1240	}
		1241	}
		1242
		1243	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1244
		1245	void
		1246	add (aio_req grp, ...)
		1247	PPCODE:
		1248	{
		1249	int i;
		1250
		1251	if (grp->int1 == 2)
		1252	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1253
		1254	for (i = 1; i < items; ++i )
		1255	{
		1256	aio_req req;
		1257
		1258	if (GIMME_V != G_VOID)
		1259	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1260
		1261	req = SvAIO_REQ (ST (i));
		1262
		1263	if (req)
		1264	eio_grp_add (grp, req);
		1265	}
		1266	}
		1267
		1268	void
		1269	cancel_subs (aio_req_ornot req)
		1270	CODE:
		1271	req_cancel_subs (req);
		1272
		1273	void
		1274	result (aio_req grp, ...)
		1275	CODE:
		1276	{
		1277	int i;
		1278	AV *av;
		1279
		1280	grp->errorno = errno;
		1281
		1282	av = newAV ();
		1283	av_extend (av, items - 1);
		1284
		1285	for (i = 1; i < items; ++i )
		1286	av_push (av, newSVsv (ST (i)));
		1287
		1288	SvREFCNT_dec (grp->sv1);
		1289	grp->sv1 = (SV *)av;
		1290	}
		1291
		1292	void
		1293	errno (aio_req grp, int errorno = errno)
		1294	CODE:
		1295	grp->errorno = errorno;
		1296
		1297	void
		1298	limit (aio_req grp, int limit)
		1299	CODE:
		1300	eio_grp_limit (grp, limit);
		1301
		1302	void
		1303	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1304	CODE:
		1305	{
		1306	SvREFCNT_dec (grp->sv2);
		1307	grp->sv2 = newSVsv (callback);
		1308	grp->feed = aio_grp_feed;
		1309
		1310	if (grp->int2 <= 0)
		1311	grp->int2 = 2;
		1312
		1313	eio_grp_limit (grp, grp->int2);
		1314	}
		1315

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