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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.27 by root, Wed Aug 17 04:47:02 2005 UTC vs.
Revision 1.65 by root, Tue Oct 24 00:26:32 2006 UTC

		1	#if __linux
		2	# define _GNU_SOURCE
		3	#endif
		4
1	#define _REENTRANT 1	5	#define _REENTRANT 1
		6
2	#include <errno.h>	7	#include <errno.h>
3		8
4	#include "EXTERN.h"	9	#include "EXTERN.h"
5	#include "perl.h"	10	#include "perl.h"
6	#include "XSUB.h"	11	#include "XSUB.h"
7		12
8	#include "autoconf/config.h"	13	#include "autoconf/config.h"
9		14
		15	#include <pthread.h>
		16
		17	#include <stddef.h>
		18	#include <errno.h>
		19	#include <sys/time.h>
		20	#include <sys/select.h>
10	#include <sys/types.h>	21	#include <sys/types.h>
11	#include <sys/stat.h>	22	#include <sys/stat.h>
12		23	#include <limits.h>
13	#include <unistd.h>	24	#include <unistd.h>
14	#include <fcntl.h>	25	#include <fcntl.h>
15	#include <signal.h>	26	#include <signal.h>
16	#include <sched.h>	27	#include <sched.h>
17		28
18	#include <pthread.h>	29	#if HAVE_SENDFILE
		30	# if __linux
		31	# include <sys/sendfile.h>
		32	# elif __freebsd
		33	# include <sys/socket.h>
		34	# include <sys/uio.h>
		35	# elif __hpux
		36	# include <sys/socket.h>
		37	# elif __solaris /* not yet */
		38	# include <sys/sendfile.h>
		39	# else
		40	# error sendfile support requested but not available
		41	# endif
		42	#endif
19		43
20	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	44	/* used for struct dirent, AIX doesn't provide it */
21	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	45	#ifndef NAME_MAX
22	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	46	# define NAME_MAX 4096
		47	#endif
23		48
24	#if __ia64	49	#if __ia64
25	# define STACKSIZE 65536	50	# define STACKSIZE 65536
		51	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		52	# define STACKSIZE PTHREAD_STACK_MIN
26	#else	53	#else
27	# define STACKSIZE 4096	54	# define STACKSIZE 16384
28	#endif	55	#endif
		56
		57	/* buffer size for various temporary buffers */
		58	#define AIO_BUFSIZE 65536
		59
		60	#define dBUF \
		61	char *aio_buf = malloc (AIO_BUFSIZE); \
		62	if (!aio_buf) \
		63	return -1;
		64
		65	#define fBUF free (aio_buf)
29		66
30	enum {	67	enum {
31	REQ_QUIT,	68	REQ_QUIT,
32	REQ_OPEN, REQ_CLOSE,	69	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,	70	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		71	REQ_SENDFILE,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	72	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35	REQ_FSYNC, REQ_FDATASYNC,	73	REQ_FSYNC, REQ_FDATASYNC,
36	REQ_UNLINK, REQ_RMDIR,	74	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
37	REQ_SYMLINK,	75	REQ_READDIR,
		76	REQ_LINK, REQ_SYMLINK,
		77	REQ_GROUP, REQ_NOP,
		78	REQ_SLEEP,
38	};	79	};
39		80
		81	#define AIO_REQ_KLASS "IO::AIO::REQ"
		82	#define AIO_GRP_KLASS "IO::AIO::GRP"
		83
40	typedef struct aio_cb {	84	typedef struct aio_cb
		85	{
41	struct aio_cb *volatile next;	86	struct aio_cb *volatile next;
42		87
43	int type;	88	SV *data, *callback;
44		89	SV *fh, *fh2;
45	int fd;	90	void *dataptr, *data2ptr;
		91	Stat_t *statdata;
46	off_t offset;	92	off_t offset;
47	size_t length;	93	size_t length;
48	ssize_t result;	94	ssize_t result;
		95
		96	STRLEN dataoffset;
		97	int type;
		98	int fd, fd2;
		99	int errorno;
49	mode_t mode; /* open */	100	mode_t mode; /* open */
50	int errorno;
51	SV *data, *callback, *fh;
52	void *dataptr, *data2ptr;
53	STRLEN dataoffset;
54		101
55	Stat_t *statdata;	102	unsigned char flags;
		103	unsigned char pri;
		104
		105	SV *self; /* the perl counterpart of this request, if any */
		106	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
56	} aio_cb;	107	} aio_cb;
57		108
		109	enum {
		110	FLAG_CANCELLED = 0x01,
		111	};
		112
58	typedef aio_cb *aio_req;	113	typedef aio_cb *aio_req;
		114	typedef aio_cb *aio_req_ornot;
59		115
		116	enum {
		117	PRI_MIN = -4,
		118	PRI_MAX = 4,
		119
		120	DEFAULT_PRI = 0,
		121	PRI_BIAS = -PRI_MIN,
		122	};
		123
		124	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		125
60	static int started;	126	static int started, wanted;
61	static volatile int nreqs;	127	static volatile int nreqs;
62	static int max_outstanding = 1<<30;	128	static int max_outstanding = 1<<30;
63	static int respipe [2];	129	static int respipe [2];
64		130
		131	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		132	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		133	#else
		134	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
		135	#endif
		136
65	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	137	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
66	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	138	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
67	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	139	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
68		140
69	static volatile aio_req reqs, reqe; /* queue start, queue end */	141	static volatile aio_req reqs, reqe; /* queue start, queue end */
70	static volatile aio_req ress, rese; /* queue start, queue end */	142	static volatile aio_req ress, rese; /* queue start, queue end */
71		143
		144	static void req_invoke (aio_req req);
72	static void free_req (aio_req req)	145	static void req_free (aio_req req);
73	{
74	if (req->data)
75	SvREFCNT_dec (req->data);
76		146
		147	/* must be called at most once */
		148	static SV *req_sv (aio_req req, const char *klass)
		149	{
77	if (req->fh)	150	if (!req->self)
		151	{
		152	req->self = (SV *)newHV ();
		153	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		154	}
		155
		156	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		157	}
		158
		159	static aio_req SvAIO_REQ (SV *sv)
		160	{
		161	MAGIC *mg;
		162
		163	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		164	croak ("object of class " AIO_REQ_KLASS " expected");
		165
		166	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		167
		168	return mg ? (aio_req)mg->mg_ptr : 0;
		169	}
		170
		171	static void aio_grp_feed (aio_req grp)
		172	{
		173	while (grp->length < grp->fd2 && !(grp->flags & FLAG_CANCELLED))
		174	{
		175	int old_len = grp->length;
		176
		177	if (grp->fh2 && SvOK (grp->fh2))
		178	{
		179	dSP;
		180
		181	ENTER;
		182	SAVETMPS;
		183	PUSHMARK (SP);
		184	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		185	PUTBACK;
		186	call_sv (grp->fh2, G_VOID | G_EVAL);
		187	SPAGAIN;
		188	FREETMPS;
		189	LEAVE;
		190	}
		191
		192	/* stop if no progress has been made */
		193	if (old_len == grp->length)
		194	{
78	SvREFCNT_dec (req->fh);	195	SvREFCNT_dec (grp->fh2);
79		196	grp->fh2 = 0;
80	if (req->statdata)	197	break;
81	Safefree (req->statdata);	198	}
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	{	199	}
		200	}
		201
		202	static void aio_grp_dec (aio_req grp)
		203	{
		204	--grp->length;
		205
		206	/* call feeder, if applicable */
		207	aio_grp_feed (grp);
		208
		209	/* finish, if done */
		210	if (!grp->length && grp->fd)
		211	{
		212	req_invoke (grp);
		213	req_free (grp);
		214	}
		215	}
		216
		217	static void poll_wait ()
		218	{
94	fd_set rfd;	219	fd_set rfd;
		220
		221	while (nreqs)
		222	{
		223	aio_req req;
		224	#if !(__i386 || __x86_64) /* safe without sempahore on this archs */
		225	pthread_mutex_lock (&reslock);
		226	#endif
		227	req = ress;
		228	#if !(__i386 || __x86_64) /* safe without sempahore on this archs */
		229	pthread_mutex_unlock (&reslock);
		230	#endif
		231
		232	if (req)
		233	return;
		234
95	FD_ZERO(&rfd);	235	FD_ZERO(&rfd);
96	FD_SET(respipe [0], &rfd);	236	FD_SET(respipe [0], &rfd);
97		237
98	select (respipe [0] + 1, &rfd, 0, 0, 0);	238	select (respipe [0] + 1, &rfd, 0, 0, 0);
99	}	239	}
100	}	240	}
101		241
102	static int	242	static void req_invoke (aio_req req)
103	poll_cb ()	243	{
		244	dSP;
		245	int errorno = errno;
		246
		247	if (req->flags & FLAG_CANCELLED || !SvOK (req->callback))
		248	return;
		249
		250	errno = req->errorno;
		251
		252	ENTER;
		253	SAVETMPS;
		254	PUSHMARK (SP);
		255	EXTEND (SP, 1);
		256
		257	switch (req->type)
		258	{
		259	case REQ_READDIR:
		260	{
		261	SV *rv = &PL_sv_undef;
		262
		263	if (req->result >= 0)
		264	{
		265	char *buf = req->data2ptr;
		266	AV *av = newAV ();
		267
		268	while (req->result)
		269	{
		270	SV *sv = newSVpv (buf, 0);
		271
		272	av_push (av, sv);
		273	buf += SvCUR (sv) + 1;
		274	req->result--;
		275	}
		276
		277	rv = sv_2mortal (newRV_noinc ((SV *)av));
		278	}
		279
		280	PUSHs (rv);
		281	}
		282	break;
		283
		284	case REQ_OPEN:
		285	{
		286	/* convert fd to fh */
		287	SV *fh;
		288
		289	PUSHs (sv_2mortal (newSViv (req->result)));
		290	PUTBACK;
		291	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		292	SPAGAIN;
		293
		294	fh = SvREFCNT_inc (POPs);
		295
		296	PUSHMARK (SP);
		297	XPUSHs (sv_2mortal (fh));
		298	}
		299	break;
		300
		301	case REQ_GROUP:
		302	req->fd = 2; /* mark group as finished */
		303
		304	if (req->data)
		305	{
		306	int i;
		307	AV *av = (AV *)req->data;
		308
		309	EXTEND (SP, AvFILL (av) + 1);
		310	for (i = 0; i <= AvFILL (av); ++i)
		311	PUSHs (*av_fetch (av, i, 0));
		312	}
		313	break;
		314
		315	case REQ_NOP:
		316	case REQ_SLEEP:
		317	break;
		318
		319	default:
		320	PUSHs (sv_2mortal (newSViv (req->result)));
		321	break;
		322	}
		323
		324
		325	PUTBACK;
		326	call_sv (req->callback, G_VOID | G_EVAL);
		327	SPAGAIN;
		328
		329	FREETMPS;
		330	LEAVE;
		331
		332	errno = errorno;
		333
		334	if (SvTRUE (ERRSV))
		335	{
		336	req_free (req);
		337	croak (0);
		338	}
		339	}
		340
		341	static void req_free (aio_req req)
		342	{
		343	if (req->grp)
		344	{
		345	aio_req grp = req->grp;
		346
		347	/* unlink request */
		348	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		349	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		350
		351	if (grp->grp_first == req)
		352	grp->grp_first = req->grp_next;
		353
		354	aio_grp_dec (grp);
		355	}
		356
		357	if (req->self)
		358	{
		359	sv_unmagic (req->self, PERL_MAGIC_ext);
		360	SvREFCNT_dec (req->self);
		361	}
		362
		363	SvREFCNT_dec (req->data);
		364	SvREFCNT_dec (req->fh);
		365	SvREFCNT_dec (req->fh2);
		366	SvREFCNT_dec (req->callback);
		367	Safefree (req->statdata);
		368
		369	if (req->type == REQ_READDIR && req->result >= 0)
		370	free (req->data2ptr);
		371
		372	Safefree (req);
		373	}
		374
		375	static void req_cancel (aio_req req)
		376	{
		377	req->flags |= FLAG_CANCELLED;
		378
		379	if (req->type == REQ_GROUP)
		380	{
		381	aio_req sub;
		382
		383	for (sub = req->grp_first; sub; sub = sub->grp_next)
		384	req_cancel (sub);
		385	}
		386	}
		387
		388	static int poll_cb ()
104	{	389	{
105	dSP;	390	dSP;
106	int count = 0;	391	int count = 0;
107	int do_croak = 0;	392	int do_croak = 0;
108	aio_req req;	393	aio_req req;
…		…
116	{	401	{
117	ress = req->next;	402	ress = req->next;
118		403
119	if (!ress)	404	if (!ress)
120	{	405	{
121	rese = 0;
122
123	/* read any signals sent by the worker threads */	406	/* read any signals sent by the worker threads */
124	char buf [32];	407	char buf [32];
125	while (read (respipe [0], buf, 32) == 32)	408	while (read (respipe [0], buf, 32) == 32)
126	;	409	;
		410
		411	rese = 0;
127	}	412	}
128	}	413	}
129		414
130	pthread_mutex_unlock (&reslock);	415	pthread_mutex_unlock (&reslock);
131		416
132	if (!req)	417	if (!req)
133	break;	418	break;
134		419
135	nreqs--;	420	--nreqs;
136		421
137	if (req->type == REQ_QUIT)	422	if (req->type == REQ_QUIT)
138	started--;	423	started--;
		424	else if (req->type == REQ_GROUP && req->length)
		425	{
		426	req->fd = 1; /* mark request as delayed */
		427	continue;
		428	}
139	else	429	else
140	{	430	{
141	int errorno = errno;
142	errno = req->errorno;
143
144	if (req->type == REQ_READ)	431	if (req->type == REQ_READ)
145	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));	432	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
		433
		434	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		435	SvREADONLY_off (req->data);
146		436
147	if (req->statdata)	437	if (req->statdata)
148	{	438	{
149	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	439	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
150	PL_laststatval = req->result;	440	PL_laststatval = req->result;
151	PL_statcache = *(req->statdata);	441	PL_statcache = *(req->statdata);
152	}	442	}
153		443
154	ENTER;	444	req_invoke (req);
155	PUSHMARK (SP);
156	XPUSHs (sv_2mortal (newSViv (req->result)));
157		445
158	if (req->type == REQ_OPEN)
159	{
160	/* convert fd to fh */
161	SV *fh;
162
163	PUTBACK;
164	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
165	SPAGAIN;
166
167	fh = SvREFCNT_inc (POPs);
168
169	PUSHMARK (SP);
170	XPUSHs (sv_2mortal (fh));
171	}
172
173	if (SvOK (req->callback))
174	{
175	PUTBACK;
176	call_sv (req->callback, G_VOID | G_EVAL);
177	SPAGAIN;
178
179	if (SvTRUE (ERRSV))
180	{
181	free_req (req);
182	croak (0);
183	}
184	}
185
186	LEAVE;
187
188	errno = errorno;
189	count++;	446	count++;
190	}	447	}
191		448
192	free_req (req);	449	req_free (req);
193	}	450	}
194		451
195	return count;	452	return count;
196	}	453	}
197		454
198	static void *aio_proc(void *arg);	455	static void *aio_proc(void *arg);
199		456
200	static void
201	start_thread (void)	457	static void start_thread (void)
202	{	458	{
203	sigset_t fullsigset, oldsigset;	459	sigset_t fullsigset, oldsigset;
204	pthread_t tid;	460	pthread_t tid;
205	pthread_attr_t attr;	461	pthread_attr_t attr;
206		462
…		…
215	started++;	471	started++;
216		472
217	sigprocmask (SIG_SETMASK, &oldsigset, 0);	473	sigprocmask (SIG_SETMASK, &oldsigset, 0);
218	}	474	}
219		475
220	static void	476	static void req_send (aio_req req)
221	send_req (aio_req req)
222	{	477	{
		478	while (started < wanted && nreqs >= started)
		479	start_thread ();
		480
223	nreqs++;	481	++nreqs;
224		482
225	pthread_mutex_lock (&reqlock);	483	pthread_mutex_lock (&reqlock);
226		484
227	req->next = 0;	485	req->next = 0;
228		486
…		…
247		505
248	poll_wait ();	506	poll_wait ();
249	}	507	}
250	}	508	}
251		509
252	static void	510	static void end_thread (void)
253	end_thread (void)
254	{	511	{
255	aio_req req;	512	aio_req req;
256	Newz (0, req, 1, aio_cb);	513	Newz (0, req, 1, aio_cb);
257	req->type = REQ_QUIT;	514	req->type = REQ_QUIT;
258		515
259	send_req (req);	516	req_send (req);
260	}	517	}
261		518
262	static void min_parallel (int nthreads)	519	static void min_parallel (int nthreads)
263	{	520	{
264	while (nthreads > started)	521	if (wanted < nthreads)
265	start_thread ();	522	wanted = nthreads;
266	}	523	}
267		524
268	static void max_parallel (int nthreads)	525	static void max_parallel (int nthreads)
269	{	526	{
270	int cur = started;	527	int cur = started;
271		528
		529	if (wanted > nthreads)
		530	wanted = nthreads;
		531
272	while (cur > nthreads)	532	while (cur > wanted)
273	{	533	{
274	end_thread ();	534	end_thread ();
275	cur--;	535	cur--;
276	}	536	}
277		537
278	while (started > nthreads)	538	while (started > wanted)
279	{	539	{
280	poll_wait ();	540	poll_wait ();
281	poll_cb ();	541	poll_cb ();
282	}	542	}
283	}	543	}
…		…
290	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	550	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
291	croak ("cannot set result pipe to nonblocking mode");	551	croak ("cannot set result pipe to nonblocking mode");
292		552
293	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	553	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
294	croak ("cannot set result pipe to nonblocking mode");	554	croak ("cannot set result pipe to nonblocking mode");
295	}
296
297	static void atfork_prepare (void)
298	{
299	for (;;) {
300
301	for (;;)
302	{
303	poll_cb ();
304
305	if (!nreqs)
306	break;
307
308	poll_wait ();
309	}
310
311	pthread_mutex_lock (&reqlock);
312
313	if (!nreqs)
314	break;
315
316	pthread_mutex_unlock (&reqlock);
317	}
318
319	pthread_mutex_lock (&reslock);
320
321	assert (!nreqs && !reqs && !ress);
322	}
323
324	static void atfork_parent (void)
325	{
326	pthread_mutex_unlock (&reslock);
327	pthread_mutex_unlock (&reqlock);
328	}
329
330	static void atfork_child (void)
331	{
332	int restart = started;
333	started = 0;
334
335	atfork_parent ();
336
337	min_parallel (restart);
338	}	555	}
339		556
340	/*****************************************************************************/	557	/*****************************************************************************/
341	/* work around various missing functions */	558	/* work around various missing functions */
342		559
…		…
347	/*	564	/*
348	* make our pread/pwrite safe against themselves, but not against	565	* make our pread/pwrite safe against themselves, but not against
349	* normal read/write by using a mutex. slows down execution a lot,	566	* normal read/write by using a mutex. slows down execution a lot,
350	* but that's your problem, not mine.	567	* but that's your problem, not mine.
351	*/	568	*/
352	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	569	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
353		570
354	static ssize_t	571	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
355	pread (int fd, void *buf, size_t count, off_t offset)
356	{	572	{
357	ssize_t res;	573	ssize_t res;
358	off_t ooffset;	574	off_t ooffset;
359		575
360	pthread_mutex_lock (&iolock);	576	pthread_mutex_lock (&preadwritelock);
361	ooffset = lseek (fd, 0, SEEK_CUR);	577	ooffset = lseek (fd, 0, SEEK_CUR);
362	lseek (fd, offset, SEEK_SET);	578	lseek (fd, offset, SEEK_SET);
363	res = read (fd, buf, count);	579	res = read (fd, buf, count);
364	lseek (fd, ooffset, SEEK_SET);	580	lseek (fd, ooffset, SEEK_SET);
365	pthread_mutex_unlock (&iolock);	581	pthread_mutex_unlock (&preadwritelock);
366		582
367	return res;	583	return res;
368	}	584	}
369		585
370	static ssize_t
371	pwrite (int fd, void *buf, size_t count, off_t offset)	586	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
372	{	587	{
373	ssize_t res;	588	ssize_t res;
374	off_t ooffset;	589	off_t ooffset;
375		590
376	pthread_mutex_lock (&iolock);	591	pthread_mutex_lock (&preadwritelock);
377	ooffset = lseek (fd, 0, SEEK_CUR);	592	ooffset = lseek (fd, 0, SEEK_CUR);
378	lseek (fd, offset, SEEK_SET);	593	lseek (fd, offset, SEEK_SET);
379	res = write (fd, buf, count);	594	res = write (fd, buf, count);
380	lseek (fd, offset, SEEK_SET);	595	lseek (fd, offset, SEEK_SET);
381	pthread_mutex_unlock (&iolock);	596	pthread_mutex_unlock (&preadwritelock);
382		597
383	return res;	598	return res;
384	}	599	}
385	#endif	600	#endif
386		601
…		…
389	#endif	604	#endif
390		605
391	#if !HAVE_READAHEAD	606	#if !HAVE_READAHEAD
392	# define readahead aio_readahead	607	# define readahead aio_readahead
393		608
394	static char readahead_buf[4096];
395
396	static ssize_t
397	readahead (int fd, off_t offset, size_t count)	609	static ssize_t readahead (int fd, off_t offset, size_t count)
398	{	610	{
		611	dBUF;
		612
399	while (count > 0)	613	while (count > 0)
400	{	614	{
401	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	615	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
402		616
403	pread (fd, readahead_buf, len, offset);	617	pread (fd, aio_buf, len, offset);
404	offset += len;	618	offset += len;
405	count -= len;	619	count -= len;
406	}	620	}
407		621
		622	fBUF;
		623
408	errno = 0;	624	errno = 0;
409	}	625	}
410	#endif	626	#endif
411		627
		628	#if !HAVE_READDIR_R
		629	# define readdir_r aio_readdir_r
		630
		631	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		632
		633	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		634	{
		635	struct dirent *e;
		636	int errorno;
		637
		638	pthread_mutex_lock (&readdirlock);
		639
		640	e = readdir (dirp);
		641	errorno = errno;
		642
		643	if (e)
		644	{
		645	*res = ent;
		646	strcpy (ent->d_name, e->d_name);
		647	}
		648	else
		649	*res = 0;
		650
		651	pthread_mutex_unlock (&readdirlock);
		652
		653	errno = errorno;
		654	return e ? 0 : -1;
		655	}
		656	#endif
		657
		658	/* sendfile always needs emulation */
		659	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
		660	{
		661	ssize_t res;
		662
		663	if (!count)
		664	return 0;
		665
		666	#if HAVE_SENDFILE
		667	# if __linux
		668	res = sendfile (ofd, ifd, &offset, count);
		669
		670	# elif __freebsd
		671	/*
		672	* Of course, the freebsd sendfile is a dire hack with no thoughts
		673	* wasted on making it similar to other I/O functions.
		674	*/
		675	{
		676	off_t sbytes;
		677	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		678
		679	if (res < 0 && sbytes)
		680	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
		681	res = sbytes;
		682	}
		683
		684	# elif __hpux
		685	res = sendfile (ofd, ifd, offset, count, 0, 0);
		686
		687	# elif __solaris
		688	{
		689	struct sendfilevec vec;
		690	size_t sbytes;
		691
		692	vec.sfv_fd = ifd;
		693	vec.sfv_flag = 0;
		694	vec.sfv_off = offset;
		695	vec.sfv_len = count;
		696
		697	res = sendfilev (ofd, &vec, 1, &sbytes);
		698
		699	if (res < 0 && sbytes)
		700	res = sbytes;
		701	}
		702
		703	# endif
		704	#else
		705	res = -1;
		706	errno = ENOSYS;
		707	#endif
		708
		709	if (res < 0
		710	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		711	#if __solaris
		712	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		713	#endif
		714	)
		715	)
		716	{
		717	/* emulate sendfile. this is a major pain in the ass */
		718	dBUF;
		719
		720	res = 0;
		721
		722	while (count)
		723	{
		724	ssize_t cnt;
		725
		726	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
		727
		728	if (cnt <= 0)
		729	{
		730	if (cnt && !res) res = -1;
		731	break;
		732	}
		733
		734	cnt = write (ofd, aio_buf, cnt);
		735
		736	if (cnt <= 0)
		737	{
		738	if (cnt && !res) res = -1;
		739	break;
		740	}
		741
		742	offset += cnt;
		743	res += cnt;
		744	count -= cnt;
		745	}
		746
		747	fBUF;
		748	}
		749
		750	return res;
		751	}
		752
		753	/* read a full directory */
		754	static int scandir_ (const char *path, void **namesp)
		755	{
		756	DIR *dirp;
		757	union
		758	{
		759	struct dirent d;
		760	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		761	} *u;
		762	struct dirent *entp;
		763	char *name, *names;
		764	int memlen = 4096;
		765	int memofs = 0;
		766	int res = 0;
		767	int errorno;
		768
		769	dirp = opendir (path);
		770	if (!dirp)
		771	return -1;
		772
		773	u = malloc (sizeof (*u));
		774	names = malloc (memlen);
		775
		776	if (u && names)
		777	for (;;)
		778	{
		779	errno = 0;
		780	readdir_r (dirp, &u->d, &entp);
		781
		782	if (!entp)
		783	break;
		784
		785	name = entp->d_name;
		786
		787	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		788	{
		789	int len = strlen (name) + 1;
		790
		791	res++;
		792
		793	while (memofs + len > memlen)
		794	{
		795	memlen *= 2;
		796	names = realloc (names, memlen);
		797	if (!names)
		798	break;
		799	}
		800
		801	memcpy (names + memofs, name, len);
		802	memofs += len;
		803	}
		804	}
		805
		806	errorno = errno;
		807	free (u);
		808	closedir (dirp);
		809
		810	if (errorno)
		811	{
		812	free (names);
		813	errno = errorno;
		814	res = -1;
		815	}
		816
		817	*namesp = (void *)names;
		818	return res;
		819	}
		820
412	/*****************************************************************************/	821	/*****************************************************************************/
413		822
414	static void *
415	aio_proc (void *thr_arg)	823	static void *aio_proc (void *thr_arg)
416	{	824	{
417	aio_req req;	825	aio_req req;
418	int type;	826	int type;
419		827
420	do	828	do
…		…
438	}	846	}
439		847
440	pthread_mutex_unlock (&reqlock);	848	pthread_mutex_unlock (&reqlock);
441		849
442	errno = 0; /* strictly unnecessary */	850	errno = 0; /* strictly unnecessary */
		851	type = req->type; /* remember type for QUIT check */
443		852
444	type = req->type;	853	if (!(req->flags & FLAG_CANCELLED))
445
446	switch (type)	854	switch (type)
447	{	855	{
448	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	856	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
449	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	857	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
450		858
451	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	859	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
		860	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
452		861
453	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	862	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
454	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	863	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
455	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	864	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
456		865
457	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	866	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
458	case REQ_CLOSE: req->result = close (req->fd); break;	867	case REQ_CLOSE: req->result = close (req->fd); break;
459	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	868	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
460	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	869	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		870	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		871	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
461	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	872	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
462		873
463	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	874	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
464	case REQ_FSYNC: req->result = fsync (req->fd); break;	875	case REQ_FSYNC: req->result = fsync (req->fd); break;
		876	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
465		877
		878	case REQ_SLEEP:
		879	{
		880	struct timeval tv;
		881
		882	tv.tv_sec = req->fd;
		883	tv.tv_usec = req->fd2;
		884
		885	req->result = select (0, 0, 0, 0, &tv);
		886	}
		887
		888	case REQ_GROUP:
		889	case REQ_NOP:
466	case REQ_QUIT:	890	case REQ_QUIT:
467	break;	891	break;
468		892
469	default:	893	default:
470	req->result = ENOSYS;	894	req->result = ENOSYS;
471	break;	895	break;
472	}	896	}
473		897
474	req->errorno = errno;	898	req->errorno = errno;
475		899
476	pthread_mutex_lock (&reslock);	900	pthread_mutex_lock (&reslock);
477		901
…		…
495	while (type != REQ_QUIT);	919	while (type != REQ_QUIT);
496		920
497	return 0;	921	return 0;
498	}	922	}
499		923
		924	/*****************************************************************************/
		925
		926	static void atfork_prepare (void)
		927	{
		928	pthread_mutex_lock (&reqlock);
		929	pthread_mutex_lock (&reslock);
		930	#if !HAVE_PREADWRITE
		931	pthread_mutex_lock (&preadwritelock);
		932	#endif
		933	#if !HAVE_READDIR_R
		934	pthread_mutex_lock (&readdirlock);
		935	#endif
		936	}
		937
		938	static void atfork_parent (void)
		939	{
		940	#if !HAVE_READDIR_R
		941	pthread_mutex_unlock (&readdirlock);
		942	#endif
		943	#if !HAVE_PREADWRITE
		944	pthread_mutex_unlock (&preadwritelock);
		945	#endif
		946	pthread_mutex_unlock (&reslock);
		947	pthread_mutex_unlock (&reqlock);
		948	}
		949
		950	static void atfork_child (void)
		951	{
		952	aio_req prv;
		953
		954	started = 0;
		955
		956	while (reqs)
		957	{
		958	prv = reqs;
		959	reqs = prv->next;
		960	req_free (prv);
		961	}
		962
		963	reqs = reqe = 0;
		964
		965	while (ress)
		966	{
		967	prv = ress;
		968	ress = prv->next;
		969	req_free (prv);
		970	}
		971
		972	ress = rese = 0;
		973
		974	close (respipe [0]);
		975	close (respipe [1]);
		976	create_pipe ();
		977
		978	atfork_parent ();
		979	}
		980
500	#define dREQ \	981	#define dREQ \
501	aio_req req; \	982	aio_req req; \
		983	int req_pri = next_pri; \
		984	next_pri = DEFAULT_PRI + PRI_BIAS; \
502	\	985	\
503	if (SvOK (callback) && !SvROK (callback)) \	986	if (SvOK (callback) && !SvROK (callback)) \
504	croak ("clalback must be undef or of reference type"); \	987	croak ("callback must be undef or of reference type"); \
505	\	988	\
506	Newz (0, req, 1, aio_cb); \	989	Newz (0, req, 1, aio_cb); \
507	if (!req) \	990	if (!req) \
508	croak ("out of memory during aio_req allocation"); \	991	croak ("out of memory during aio_req allocation"); \
509	\	992	\
510	req->callback = newSVsv (callback);	993	req->callback = newSVsv (callback); \
		994	req->pri = req_pri
		995
		996	#define REQ_SEND \
		997	req_send (req); \
		998	\
		999	if (GIMME_V != G_VOID) \
		1000	XPUSHs (req_sv (req, AIO_REQ_KLASS));
511		1001
512	MODULE = IO::AIO PACKAGE = IO::AIO	1002	MODULE = IO::AIO PACKAGE = IO::AIO
513		1003
514	PROTOTYPES: ENABLE	1004	PROTOTYPES: ENABLE
515		1005
516	BOOT:	1006	BOOT:
517	{	1007	{
		1008	HV *stash = gv_stashpv ("IO::AIO", 1);
		1009	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		1010	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1011	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1012
518	create_pipe ();	1013	create_pipe ();
519	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1014	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
520	}	1015	}
521		1016
522	void	1017	void
523	min_parallel(nthreads)	1018	min_parallel (nthreads)
524	int nthreads	1019	int nthreads
525	PROTOTYPE: $	1020	PROTOTYPE: $
526		1021
527	void	1022	void
528	max_parallel(nthreads)	1023	max_parallel (nthreads)
529	int nthreads	1024	int nthreads
530	PROTOTYPE: $	1025	PROTOTYPE: $
531		1026
532	int	1027	int
533	max_outstanding(nreqs)	1028	max_outstanding (nreqs)
534	int nreqs	1029	int nreqs
535	PROTOTYPE: $	1030	PROTOTYPE: $
536	CODE:	1031	CODE:
537	RETVAL = max_outstanding;	1032	RETVAL = max_outstanding;
538	max_outstanding = nreqs;	1033	max_outstanding = nreqs;
539		1034
540	void	1035	void
541	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1036	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
542	SV * pathname	1037	SV * pathname
543	int flags	1038	int flags
544	int mode	1039	int mode
545	SV * callback	1040	SV * callback
546	PROTOTYPE: $$$;$	1041	PROTOTYPE: $$$;$
547	CODE:	1042	PPCODE:
548	{	1043	{
549	dREQ;	1044	dREQ;
550		1045
551	req->type = REQ_OPEN;	1046	req->type = REQ_OPEN;
552	req->data = newSVsv (pathname);	1047	req->data = newSVsv (pathname);
553	req->dataptr = SvPVbyte_nolen (req->data);	1048	req->dataptr = SvPVbyte_nolen (req->data);
554	req->fd = flags;	1049	req->fd = flags;
555	req->mode = mode;	1050	req->mode = mode;
556		1051
557	send_req (req);	1052	REQ_SEND;
558	}	1053	}
559		1054
560	void	1055	void
561	aio_close(fh,callback=&PL_sv_undef)	1056	aio_close (fh,callback=&PL_sv_undef)
562	SV * fh	1057	SV * fh
563	SV * callback	1058	SV * callback
564	PROTOTYPE: $;$	1059	PROTOTYPE: $;$
565	ALIAS:	1060	ALIAS:
566	aio_close = REQ_CLOSE	1061	aio_close = REQ_CLOSE
567	aio_fsync = REQ_FSYNC	1062	aio_fsync = REQ_FSYNC
568	aio_fdatasync = REQ_FDATASYNC	1063	aio_fdatasync = REQ_FDATASYNC
569	CODE:	1064	PPCODE:
570	{	1065	{
571	dREQ;	1066	dREQ;
572		1067
573	req->type = ix;	1068	req->type = ix;
574	req->fh = newSVsv (fh);	1069	req->fh = newSVsv (fh);
575	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1070	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
576		1071
577	send_req (req);	1072	REQ_SEND (req);
578	}	1073	}
579		1074
580	void	1075	void
581	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1076	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
582	SV * fh	1077	SV * fh
583	UV offset	1078	UV offset
584	IV length	1079	UV length
585	SV * data	1080	SV * data
586	IV dataoffset	1081	UV dataoffset
587	SV * callback	1082	SV * callback
588	ALIAS:	1083	ALIAS:
589	aio_read = REQ_READ	1084	aio_read = REQ_READ
590	aio_write = REQ_WRITE	1085	aio_write = REQ_WRITE
591	PROTOTYPE: $$$$$;$	1086	PROTOTYPE: $$$$$;$
592	CODE:	1087	PPCODE:
593	{	1088	{
594	aio_req req;	1089	aio_req req;
595	STRLEN svlen;	1090	STRLEN svlen;
596	char *svptr = SvPVbyte (data, svlen);	1091	char *svptr = SvPVbyte (data, svlen);
597		1092
…		…
629	req->offset = offset;	1124	req->offset = offset;
630	req->length = length;	1125	req->length = length;
631	req->data = SvREFCNT_inc (data);	1126	req->data = SvREFCNT_inc (data);
632	req->dataptr = (char *)svptr + dataoffset;	1127	req->dataptr = (char *)svptr + dataoffset;
633		1128
634	send_req (req);	1129	if (!SvREADONLY (data))
		1130	{
		1131	SvREADONLY_on (data);
		1132	req->data2ptr = (void *)data;
		1133	}
		1134
		1135	REQ_SEND;
635	}	1136	}
636	}	1137	}
637		1138
638	void	1139	void
		1140	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1141	SV * out_fh
		1142	SV * in_fh
		1143	UV in_offset
		1144	UV length
		1145	SV * callback
		1146	PROTOTYPE: $$$$;$
		1147	PPCODE:
		1148	{
		1149	dREQ;
		1150
		1151	req->type = REQ_SENDFILE;
		1152	req->fh = newSVsv (out_fh);
		1153	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1154	req->fh2 = newSVsv (in_fh);
		1155	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1156	req->offset = in_offset;
		1157	req->length = length;
		1158
		1159	REQ_SEND;
		1160	}
		1161
		1162	void
639	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1163	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
640	SV * fh	1164	SV * fh
641	UV offset	1165	UV offset
642	IV length	1166	IV length
643	SV * callback	1167	SV * callback
644	PROTOTYPE: $$$;$	1168	PROTOTYPE: $$$;$
645	CODE:	1169	PPCODE:
646	{	1170	{
647	dREQ;	1171	dREQ;
648		1172
649	req->type = REQ_READAHEAD;	1173	req->type = REQ_READAHEAD;
650	req->fh = newSVsv (fh);	1174	req->fh = newSVsv (fh);
651	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1175	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
652	req->offset = offset;	1176	req->offset = offset;
653	req->length = length;	1177	req->length = length;
654		1178
655	send_req (req);	1179	REQ_SEND;
656	}	1180	}
657		1181
658	void	1182	void
659	aio_stat(fh_or_path,callback=&PL_sv_undef)	1183	aio_stat (fh_or_path,callback=&PL_sv_undef)
660	SV * fh_or_path	1184	SV * fh_or_path
661	SV * callback	1185	SV * callback
662	ALIAS:	1186	ALIAS:
663	aio_stat = REQ_STAT	1187	aio_stat = REQ_STAT
664	aio_lstat = REQ_LSTAT	1188	aio_lstat = REQ_LSTAT
665	CODE:	1189	PPCODE:
666	{	1190	{
667	dREQ;	1191	dREQ;
668		1192
669	New (0, req->statdata, 1, Stat_t);	1193	New (0, req->statdata, 1, Stat_t);
670	if (!req->statdata)	1194	if (!req->statdata)
671	{	1195	{
672	free_req (req);	1196	req_free (req);
673	croak ("out of memory during aio_req->statdata allocation");	1197	croak ("out of memory during aio_req->statdata allocation");
674	}	1198	}
675		1199
676	if (SvPOK (fh_or_path))	1200	if (SvPOK (fh_or_path))
677	{	1201	{
…		…
684	req->type = REQ_FSTAT;	1208	req->type = REQ_FSTAT;
685	req->fh = newSVsv (fh_or_path);	1209	req->fh = newSVsv (fh_or_path);
686	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1210	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
687	}	1211	}
688		1212
689	send_req (req);	1213	REQ_SEND;
690	}	1214	}
691		1215
692	void	1216	void
693	aio_unlink(pathname,callback=&PL_sv_undef)	1217	aio_unlink (pathname,callback=&PL_sv_undef)
694	SV * pathname	1218	SV * pathname
695	SV * callback	1219	SV * callback
696	ALIAS:	1220	ALIAS:
697	aio_unlink = REQ_UNLINK	1221	aio_unlink = REQ_UNLINK
698	aio_rmdir = REQ_RMDIR	1222	aio_rmdir = REQ_RMDIR
		1223	aio_readdir = REQ_READDIR
699	CODE:	1224	PPCODE:
700	{	1225	{
701	dREQ;	1226	dREQ;
702		1227
703	req->type = ix;	1228	req->type = ix;
704	req->data = newSVsv (pathname);	1229	req->data = newSVsv (pathname);
705	req->dataptr = SvPVbyte_nolen (req->data);	1230	req->dataptr = SvPVbyte_nolen (req->data);
706		1231
707	send_req (req);	1232	REQ_SEND;
708	}	1233	}
709		1234
710	void	1235	void
711	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1236	aio_link (oldpath,newpath,callback=&PL_sv_undef)
712	SV * oldpath	1237	SV * oldpath
713	SV * newpath	1238	SV * newpath
714	SV * callback	1239	SV * callback
		1240	ALIAS:
		1241	aio_link = REQ_LINK
		1242	aio_symlink = REQ_SYMLINK
		1243	aio_rename = REQ_RENAME
715	CODE:	1244	PPCODE:
716	{	1245	{
717	dREQ;	1246	dREQ;
718		1247
719	req->type = REQ_SYMLINK;	1248	req->type = ix;
720	req->fh = newSVsv (oldpath);	1249	req->fh = newSVsv (oldpath);
721	req->data2ptr = SvPVbyte_nolen (req->fh);	1250	req->data2ptr = SvPVbyte_nolen (req->fh);
722	req->data = newSVsv (newpath);	1251	req->data = newSVsv (newpath);
723	req->dataptr = SvPVbyte_nolen (req->data);	1252	req->dataptr = SvPVbyte_nolen (req->data);
724		1253
725	send_req (req);	1254	REQ_SEND;
726	}	1255	}
727		1256
728	void	1257	void
		1258	aio_sleep (delay,callback=&PL_sv_undef)
		1259	double delay
		1260	SV * callback
		1261	PPCODE:
		1262	{
		1263	dREQ;
		1264
		1265	req->type = REQ_SLEEP;
		1266	req->fd = delay < 0. ? 0 : delay;
		1267	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1268
		1269	REQ_SEND;
		1270	}
		1271
		1272	void
		1273	aio_group (callback=&PL_sv_undef)
		1274	SV * callback
		1275	PROTOTYPE: ;$
		1276	PPCODE:
		1277	{
		1278	dREQ;
		1279
		1280	req->type = REQ_GROUP;
		1281	req_send (req);
		1282
		1283	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1284	}
		1285
		1286	void
		1287	aio_nop (callback=&PL_sv_undef)
		1288	SV * callback
		1289	PPCODE:
		1290	{
		1291	dREQ;
		1292
		1293	req->type = REQ_NOP;
		1294
		1295	REQ_SEND;
		1296	}
		1297
		1298	#if 0
		1299
		1300	void
		1301	aio_pri (int pri = DEFAULT_PRI)
		1302	CODE:
		1303	if (pri < PRI_MIN) pri = PRI_MIN;
		1304	if (pri > PRI_MAX) pri = PRI_MAX;
		1305	next_pri = pri + PRI_BIAS;
		1306
		1307	#endif
		1308
		1309	void
729	flush()	1310	flush ()
730	PROTOTYPE:	1311	PROTOTYPE:
731	CODE:	1312	CODE:
732	while (nreqs)	1313	while (nreqs)
733	{	1314	{
734	poll_wait ();	1315	poll_wait ();
…		…
774	CODE:	1355	CODE:
775	RETVAL = nreqs;	1356	RETVAL = nreqs;
776	OUTPUT:	1357	OUTPUT:
777	RETVAL	1358	RETVAL
778		1359
		1360	PROTOTYPES: DISABLE
		1361
		1362	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1363
		1364	void
		1365	cancel (aio_req_ornot req)
		1366	PROTOTYPE:
		1367	CODE:
		1368	req_cancel (req);
		1369
		1370	void
		1371	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1372	CODE:
		1373	SvREFCNT_dec (req->callback);
		1374	req->callback = newSVsv (callback);
		1375
		1376	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1377
		1378	void
		1379	add (aio_req grp, ...)
		1380	PPCODE:
		1381	{
		1382	int i;
		1383	aio_req req;
		1384
		1385	if (grp->fd == 2)
		1386	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1387
		1388	for (i = 1; i < items; ++i )
		1389	{
		1390	if (GIMME_V != G_VOID)
		1391	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1392
		1393	req = SvAIO_REQ (ST (i));
		1394
		1395	if (req)
		1396	{
		1397	++grp->length;
		1398	req->grp = grp;
		1399
		1400	req->grp_prev = 0;
		1401	req->grp_next = grp->grp_first;
		1402
		1403	if (grp->grp_first)
		1404	grp->grp_first->grp_prev = req;
		1405
		1406	grp->grp_first = req;
		1407	}
		1408	}
		1409	}
		1410
		1411	void
		1412	result (aio_req grp, ...)
		1413	CODE:
		1414	{
		1415	int i;
		1416	AV *av = newAV ();
		1417
		1418	for (i = 1; i < items; ++i )
		1419	av_push (av, newSVsv (ST (i)));
		1420
		1421	SvREFCNT_dec (grp->data);
		1422	grp->data = (SV *)av;
		1423	}
		1424
		1425	void
		1426	feed_limit (aio_req grp, int limit)
		1427	CODE:
		1428	grp->fd2 = limit;
		1429	aio_grp_feed (grp);
		1430
		1431	void
		1432	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1433	CODE:
		1434	{
		1435	SvREFCNT_dec (grp->fh2);
		1436	grp->fh2 = newSVsv (callback);
		1437
		1438	if (grp->fd2 <= 0)
		1439	grp->fd2 = 2;
		1440
		1441	aio_grp_feed (grp);
		1442	}
		1443

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