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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.16 by root, Sun Jul 31 18:20:07 2005 UTC vs.
Revision 1.66 by root, Tue Oct 24 00:34:47 2006 UTC

		1	#if __linux
		2	# define _GNU_SOURCE
		3	#endif
		4
		5	#define _REENTRANT 1
		6
		7	#include <errno.h>
		8
1	#include "EXTERN.h"	9	#include "EXTERN.h"
2	#include "perl.h"	10	#include "perl.h"
3	#include "XSUB.h"	11	#include "XSUB.h"
4		12
5	#include "autoconf/config.h"	13	#include "autoconf/config.h"
6		14
		15	#include <pthread.h>
		16
		17	#include <stddef.h>
		18	#include <errno.h>
		19	#include <sys/time.h>
		20	#include <sys/select.h>
7	#include <sys/types.h>	21	#include <sys/types.h>
8	#include <sys/stat.h>	22	#include <sys/stat.h>
9		23	#include <limits.h>
10	#include <unistd.h>	24	#include <unistd.h>
11	#include <fcntl.h>	25	#include <fcntl.h>
12	#include <signal.h>	26	#include <signal.h>
13	#include <sched.h>	27	#include <sched.h>
14		28
15	#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
16		43
17	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	44	/* used for struct dirent, AIX doesn't provide it */
18	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	45	#ifndef NAME_MAX
19	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	46	# define NAME_MAX 4096
		47	#endif
20		48
21	#if __ia64	49	#if __ia64
22	# define STACKSIZE 65536	50	# define STACKSIZE 65536
		51	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		52	# define STACKSIZE PTHREAD_STACK_MIN
23	#else	53	#else
24	# define STACKSIZE 4096	54	# define STACKSIZE 16384
25	#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)
26		66
27	enum {	67	enum {
28	REQ_QUIT,	68	REQ_QUIT,
29	REQ_OPEN, REQ_CLOSE,	69	REQ_OPEN, REQ_CLOSE,
30	REQ_READ, REQ_WRITE, REQ_READAHEAD,	70	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		71	REQ_SENDFILE,
31	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	72	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
32	REQ_FSYNC, REQ_FDATASYNC,	73	REQ_FSYNC, REQ_FDATASYNC,
		74	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
		75	REQ_READDIR,
		76	REQ_LINK, REQ_SYMLINK,
		77	REQ_GROUP, REQ_NOP,
		78	REQ_SLEEP,
33	};	79	};
34		80
		81	#define AIO_REQ_KLASS "IO::AIO::REQ"
		82	#define AIO_GRP_KLASS "IO::AIO::GRP"
		83
35	typedef struct aio_cb {	84	typedef struct aio_cb
		85	{
36	struct aio_cb *volatile next;	86	struct aio_cb *volatile next;
37		87
38	int type;	88	SV *data, *callback;
39		89	SV *fh, *fh2;
40	int fd;	90	void *dataptr, *data2ptr;
		91	Stat_t *statdata;
41	off_t offset;	92	off_t offset;
42	size_t length;	93	size_t length;
43	ssize_t result;	94	ssize_t result;
		95
		96	STRLEN dataoffset;
		97	int type;
		98	int fd, fd2;
		99	int errorno;
44	mode_t mode; /* open */	100	mode_t mode; /* open */
45	int errorno;
46	SV *data, *callback, *fh;
47	void *dataptr;
48	STRLEN dataoffset;
49		101
50	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;
51	} aio_cb;	107	} aio_cb;
52		108
		109	enum {
		110	FLAG_CANCELLED = 0x01,
		111	};
		112
53	typedef aio_cb *aio_req;	113	typedef aio_cb *aio_req;
		114	typedef aio_cb *aio_req_ornot;
54		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
55	static int started;	126	static int started, wanted;
56	static volatile int nreqs;	127	static volatile int nreqs;
57	static int max_outstanding = 1<<30;	128	static int max_outstanding = 1<<30;
58	static int respipe [2];	129	static int respipe [2];
59		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
60	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	137	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
61	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	138	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
62	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	139	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
63		140
64	static volatile aio_req reqs, reqe; /* queue start, queue end */	141	static volatile aio_req reqs, reqe; /* queue start, queue end */
65	static volatile aio_req ress, rese; /* queue start, queue end */	142	static volatile aio_req ress, rese; /* queue start, queue end */
66		143
67	static void	144	static void req_invoke (aio_req req);
68	poll_wait ()	145	static void req_free (aio_req req);
		146
		147	/* must be called at most once */
		148	static SV *req_sv (aio_req req, const char *klass)
69	{	149	{
70	if (nreqs && !ress)	150	if (!req->self)
		151	{
		152	req->self = (SV *)newHV ();
		153	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
71	{	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	{
		195	SvREFCNT_dec (grp->fh2);
		196	grp->fh2 = 0;
		197	break;
		198	}
		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	{
72	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
73	FD_ZERO(&rfd);	235	FD_ZERO(&rfd);
74	FD_SET(respipe [0], &rfd);	236	FD_SET(respipe [0], &rfd);
75		237
76	select (respipe [0] + 1, &rfd, 0, 0, 0);	238	select (respipe [0] + 1, &rfd, 0, 0, 0);
77	}	239	}
78	}	240	}
79		241
80	static int	242	static void req_invoke (aio_req req)
81	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 ()
82	{	389	{
83	dSP;	390	dSP;
84	int count = 0;	391	int count = 0;
		392	int do_croak = 0;
85	aio_req req, prv;	393	aio_req req;
86		394
		395	for (;;)
		396	{
87	pthread_mutex_lock (&reslock);	397	pthread_mutex_lock (&reslock);
		398	req = ress;
88		399
89	{	400	if (req)
		401	{
		402	ress = req->next;
		403
		404	if (!ress)
		405	{
90	/* read any signals sent by the worker threads */	406	/* read any signals sent by the worker threads */
91	char buf [32];	407	char buf [32];
92	while (read (respipe [0], buf, 32) > 0)	408	while (read (respipe [0], buf, 32) == 32)
		409	;
		410
		411	rese = 0;
		412	}
93	;	413	}
94	}
95		414
96	req = ress;
97	ress = rese = 0;
98
99	pthread_mutex_unlock (&reslock);	415	pthread_mutex_unlock (&reslock);
100		416
101	while (req)	417	if (!req)
102	{	418	break;
		419
103	nreqs--;	420	--nreqs;
104		421
105	if (req->type == REQ_QUIT)	422	if (req->type == REQ_QUIT)
106	started--;	423	started--;
		424	else if (req->type == REQ_GROUP && req->length)
		425	{
		426	req->fd = 1; /* mark request as delayed */
		427	continue;
		428	}
107	else	429	else
108	{	430	{
109	int errorno = errno;
110	errno = req->errorno;
111
112	if (req->type == REQ_READ)	431	if (req->type == REQ_READ)
113	SvCUR_set (req->data, req->dataoffset	432	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
114	+ req->result > 0 ? req->result : 0);
115		433
		434	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		435	SvREADONLY_off (req->data);
		436
116	if (req->data)	437	if (req->statdata)
117	SvREFCNT_dec (req->data);
118
119	if (req->fh)
120	SvREFCNT_dec (req->fh);
121
122	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
123	{	438	{
124	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	439	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
125	PL_laststatval = req->result;	440	PL_laststatval = req->result;
126	PL_statcache = *(req->statdata);	441	PL_statcache = *(req->statdata);
127
128	Safefree (req->statdata);
129	}	442	}
130		443
131	ENTER;	444	req_invoke (req);
132	PUSHMARK (SP);
133	XPUSHs (sv_2mortal (newSViv (req->result)));
134		445
135	if (req->type == REQ_OPEN)
136	{
137	/* convert fd to fh */
138	SV *fh;
139
140	PUTBACK;
141	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
142	SPAGAIN;
143
144	fh = SvREFCNT_inc (POPs);
145
146	PUSHMARK (SP);
147	XPUSHs (sv_2mortal (fh));
148	}
149
150	if (SvOK (req->callback))
151	{
152	PUTBACK;
153	call_sv (req->callback, G_VOID | G_EVAL);
154	SPAGAIN;
155	}
156
157	LEAVE;
158
159	if (req->callback)
160	SvREFCNT_dec (req->callback);
161
162	errno = errorno;
163	count++;	446	count++;
164	}	447	}
165		448
166	prv = req;
167	req = req->next;
168	Safefree (prv);	449	req_free (req);
169
170	/* TODO: croak on errors? */
171	}	450	}
172		451
173	return count;	452	return count;
174	}	453	}
175		454
176	static void *aio_proc(void *arg);	455	static void *aio_proc(void *arg);
177		456
178	static void
179	start_thread (void)	457	static void start_thread (void)
180	{	458	{
181	sigset_t fullsigset, oldsigset;	459	sigset_t fullsigset, oldsigset;
182	pthread_t tid;	460	pthread_t tid;
183	pthread_attr_t attr;	461	pthread_attr_t attr;
184		462
…		…
193	started++;	471	started++;
194		472
195	sigprocmask (SIG_SETMASK, &oldsigset, 0);	473	sigprocmask (SIG_SETMASK, &oldsigset, 0);
196	}	474	}
197		475
198	static void	476	static void req_send (aio_req req)
199	send_req (aio_req req)
200	{	477	{
		478	while (started < wanted && nreqs >= started)
		479	start_thread ();
		480
201	nreqs++;	481	++nreqs;
202		482
203	pthread_mutex_lock (&reqlock);	483	pthread_mutex_lock (&reqlock);
204		484
205	req->next = 0;	485	req->next = 0;
206		486
…		…
213	reqe = reqs = req;	493	reqe = reqs = req;
214		494
215	pthread_cond_signal (&reqwait);	495	pthread_cond_signal (&reqwait);
216	pthread_mutex_unlock (&reqlock);	496	pthread_mutex_unlock (&reqlock);
217		497
218	while (nreqs > max_outstanding)	498	if (nreqs > max_outstanding)
		499	for (;;)
		500	{
		501	poll_cb ();
		502
		503	if (nreqs <= max_outstanding)
		504	break;
		505
		506	poll_wait ();
		507	}
		508	}
		509
		510	static void end_thread (void)
		511	{
		512	aio_req req;
		513	Newz (0, req, 1, aio_cb);
		514	req->type = REQ_QUIT;
		515
		516	req_send (req);
		517	}
		518
		519	static void min_parallel (int nthreads)
		520	{
		521	if (wanted < nthreads)
		522	wanted = nthreads;
		523	}
		524
		525	static void max_parallel (int nthreads)
		526	{
		527	int cur = started;
		528
		529	if (wanted > nthreads)
		530	wanted = nthreads;
		531
		532	while (cur > wanted)
		533	{
		534	end_thread ();
		535	cur--;
		536	}
		537
		538	while (started > wanted)
219	{	539	{
220	poll_wait ();	540	poll_wait ();
221	poll_cb ();	541	poll_cb ();
222	}	542	}
223	}	543	}
224		544
225	static void	545	static void create_pipe ()
226	end_thread (void)
227	{	546	{
228	aio_req req;	547	if (pipe (respipe))
229	New (0, req, 1, aio_cb);	548	croak ("unable to initialize result pipe");
230	req->type = REQ_QUIT;
231		549
232	send_req (req);	550	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
233	}	551	croak ("cannot set result pipe to nonblocking mode");
234		552
235	static void *	553	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		554	croak ("cannot set result pipe to nonblocking mode");
		555	}
		556
		557	/*****************************************************************************/
		558	/* work around various missing functions */
		559
		560	#if !HAVE_PREADWRITE
		561	# define pread aio_pread
		562	# define pwrite aio_pwrite
		563
		564	/*
		565	* make our pread/pwrite safe against themselves, but not against
		566	* normal read/write by using a mutex. slows down execution a lot,
		567	* but that's your problem, not mine.
		568	*/
		569	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
		570
		571	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		572	{
		573	ssize_t res;
		574	off_t ooffset;
		575
		576	pthread_mutex_lock (&preadwritelock);
		577	ooffset = lseek (fd, 0, SEEK_CUR);
		578	lseek (fd, offset, SEEK_SET);
		579	res = read (fd, buf, count);
		580	lseek (fd, ooffset, SEEK_SET);
		581	pthread_mutex_unlock (&preadwritelock);
		582
		583	return res;
		584	}
		585
		586	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		587	{
		588	ssize_t res;
		589	off_t ooffset;
		590
		591	pthread_mutex_lock (&preadwritelock);
		592	ooffset = lseek (fd, 0, SEEK_CUR);
		593	lseek (fd, offset, SEEK_SET);
		594	res = write (fd, buf, count);
		595	lseek (fd, offset, SEEK_SET);
		596	pthread_mutex_unlock (&preadwritelock);
		597
		598	return res;
		599	}
		600	#endif
		601
		602	#if !HAVE_FDATASYNC
		603	# define fdatasync fsync
		604	#endif
		605
		606	#if !HAVE_READAHEAD
		607	# define readahead aio_readahead
		608
		609	static ssize_t readahead (int fd, off_t offset, size_t count)
		610	{
		611	dBUF;
		612
		613	while (count > 0)
		614	{
		615	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
		616
		617	pread (fd, aio_buf, len, offset);
		618	offset += len;
		619	count -= len;
		620	}
		621
		622	fBUF;
		623
		624	errno = 0;
		625	}
		626	#endif
		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
		821	/*****************************************************************************/
		822
236	aio_proc (void *thr_arg)	823	static void *aio_proc (void *thr_arg)
237	{	824	{
238	aio_req req;	825	aio_req req;
239	int type;	826	int type;
240		827
241	do	828	do
…		…
259	}	846	}
260		847
261	pthread_mutex_unlock (&reqlock);	848	pthread_mutex_unlock (&reqlock);
262		849
263	errno = 0; /* strictly unnecessary */	850	errno = 0; /* strictly unnecessary */
		851	type = req->type; /* remember type for QUIT check */
264		852
265	type = req->type;	853	if (!(req->flags & FLAG_CANCELLED))
266
267	switch (type)	854	switch (type)
268	{	855	{
269	#if HAVE_PREADWRITE
270	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;
271	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;
272	#else
273	# error "pread/pwrite cannot be emulated, fix your os"
274	#endif
275		858
276	#if HAVE_READAHEAD
277	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;
278	#else	860	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
279	// TODO: emulate
280	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
281	#endif
282		861
283	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	862	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
284	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	863	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
285	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	864	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
286		865
287	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;
288	case REQ_CLOSE: req->result = close (req->fd); break;	867	case REQ_CLOSE: req->result = close (req->fd); break;
289	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	868	case REQ_UNLINK: req->result = unlink (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;
		872	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
290		873
291	case REQ_FDATASYNC:
292	#if HAVE_FDATASYNC
293	req->result = fdatasync (req->fd); break;	874	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
294	#endif
295	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;
296		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:
297	case REQ_QUIT:	890	case REQ_QUIT:
298	break;	891	break;
299		892
300	default:	893	default:
301	req->result = ENOSYS;	894	req->result = ENOSYS;
302	break;	895	break;
303	}	896	}
304		897
305	req->errorno = errno;	898	req->errorno = errno;
306		899
307	pthread_mutex_lock (&reslock);	900	pthread_mutex_lock (&reslock);
308		901
…		…
326	while (type != REQ_QUIT);	919	while (type != REQ_QUIT);
327		920
328	return 0;	921	return 0;
329	}	922	}
330		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
		981	#define dREQ \
		982	aio_req req; \
		983	int req_pri = next_pri; \
		984	next_pri = DEFAULT_PRI + PRI_BIAS; \
		985	\
		986	if (SvOK (callback) && !SvROK (callback)) \
		987	croak ("callback must be undef or of reference type"); \
		988	\
		989	Newz (0, req, 1, aio_cb); \
		990	if (!req) \
		991	croak ("out of memory during aio_req allocation"); \
		992	\
		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));
		1001
331	MODULE = IO::AIO PACKAGE = IO::AIO	1002	MODULE = IO::AIO PACKAGE = IO::AIO
332		1003
333	PROTOTYPES: ENABLE	1004	PROTOTYPES: ENABLE
334		1005
335	BOOT:	1006	BOOT:
336	{	1007	{
337	if (pipe (respipe))	1008	HV *stash = gv_stashpv ("IO::AIO", 1);
338	croak ("unable to initialize result pipe");	1009	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		1010	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1011	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
339		1012
340	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	1013	create_pipe ();
341	croak ("cannot set result pipe to nonblocking mode");	1014	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
342
343	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
344	croak ("cannot set result pipe to nonblocking mode");
345	}	1015	}
346		1016
347	void	1017	void
348	min_parallel(nthreads)	1018	min_parallel (nthreads)
349	int nthreads	1019	int nthreads
350	PROTOTYPE: $	1020	PROTOTYPE: $
351	CODE:
352	while (nthreads > started)
353	start_thread ();
354		1021
355	void	1022	void
356	max_parallel(nthreads)	1023	max_parallel (nthreads)
357	int nthreads	1024	int nthreads
358	PROTOTYPE: $	1025	PROTOTYPE: $
359	CODE:
360	{
361	int cur = started;
362	while (cur > nthreads)
363	{
364	end_thread ();
365	cur--;
366	}
367
368	while (started > nthreads)
369	{
370	poll_wait ();
371	poll_cb ();
372	}
373	}
374		1026
375	int	1027	int
376	max_outstanding(nreqs)	1028	max_outstanding (nreqs)
377	int nreqs	1029	int nreqs
378	PROTOTYPE: $	1030	PROTOTYPE: $
379	CODE:	1031	CODE:
380	RETVAL = max_outstanding;	1032	RETVAL = max_outstanding;
381	max_outstanding = nreqs;	1033	max_outstanding = nreqs;
382		1034
383	void	1035	void
384	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1036	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
385	SV * pathname	1037	SV * pathname
386	int flags	1038	int flags
387	int mode	1039	int mode
388	SV * callback	1040	SV * callback
389	PROTOTYPE: $$$;$	1041	PROTOTYPE: $$$;$
390	CODE:	1042	PPCODE:
391	{	1043	{
392	aio_req req;	1044	dREQ;
393
394	Newz (0, req, 1, aio_cb);
395
396	if (!req)
397	croak ("out of memory during aio_req allocation");
398		1045
399	req->type = REQ_OPEN;	1046	req->type = REQ_OPEN;
400	req->data = newSVsv (pathname);	1047	req->data = newSVsv (pathname);
401	req->dataptr = SvPV_nolen (req->data);	1048	req->dataptr = SvPVbyte_nolen (req->data);
402	req->fd = flags;	1049	req->fd = flags;
403	req->mode = mode;	1050	req->mode = mode;
404	req->callback = SvREFCNT_inc (callback);
405		1051
406	send_req (req);	1052	REQ_SEND;
407	}	1053	}
408		1054
409	void	1055	void
410	aio_close(fh,callback=&PL_sv_undef)	1056	aio_close (fh,callback=&PL_sv_undef)
411	SV * fh	1057	SV * fh
412	SV * callback	1058	SV * callback
413	PROTOTYPE: $;$	1059	PROTOTYPE: $;$
414	ALIAS:	1060	ALIAS:
415	aio_close = REQ_CLOSE	1061	aio_close = REQ_CLOSE
416	aio_fsync = REQ_FSYNC	1062	aio_fsync = REQ_FSYNC
417	aio_fdatasync = REQ_FDATASYNC	1063	aio_fdatasync = REQ_FDATASYNC
418	CODE:	1064	PPCODE:
419	{	1065	{
420	aio_req req;	1066	dREQ;
421
422	Newz (0, req, 1, aio_cb);
423
424	if (!req)
425	croak ("out of memory during aio_req allocation");
426		1067
427	req->type = ix;	1068	req->type = ix;
428	req->fh = newSVsv (fh);	1069	req->fh = newSVsv (fh);
429	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1070	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
430	req->callback = SvREFCNT_inc (callback);
431		1071
432	send_req (req);	1072	REQ_SEND (req);
433	}	1073	}
434		1074
435	void	1075	void
436	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1076	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
437	SV * fh	1077	SV * fh
438	UV offset	1078	UV offset
439	IV length	1079	UV length
440	SV * data	1080	SV * data
441	IV dataoffset	1081	UV dataoffset
442	SV * callback	1082	SV * callback
443	ALIAS:	1083	ALIAS:
444	aio_read = REQ_READ	1084	aio_read = REQ_READ
445	aio_write = REQ_WRITE	1085	aio_write = REQ_WRITE
446	PROTOTYPE: $$$$$;$	1086	PROTOTYPE: $$$$$;$
447	CODE:	1087	PPCODE:
448	{	1088	{
449	aio_req req;	1089	aio_req req;
450	STRLEN svlen;	1090	STRLEN svlen;
451	char *svptr = SvPV (data, svlen);	1091	char *svptr = SvPVbyte (data, svlen);
452		1092
453	SvUPGRADE (data, SVt_PV);	1093	SvUPGRADE (data, SVt_PV);
454	SvPOK_on (data);	1094	SvPOK_on (data);
455		1095
456	if (dataoffset < 0)	1096	if (dataoffset < 0)
…		…
472	}	1112	}
473		1113
474	if (length < 0)	1114	if (length < 0)
475	croak ("length must not be negative");	1115	croak ("length must not be negative");
476		1116
477	Newz (0, req, 1, aio_cb);	1117	{
		1118	dREQ;
478		1119
479	if (!req)
480	croak ("out of memory during aio_req allocation");
481
482	req->type = ix;	1120	req->type = ix;
483	req->fh = newSVsv (fh);	1121	req->fh = newSVsv (fh);
484	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1122	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
485	: IoOFP (sv_2io (fh)));	1123	: IoOFP (sv_2io (fh)));
486	req->offset = offset;	1124	req->offset = offset;
		1125	req->length = length;
		1126	req->data = SvREFCNT_inc (data);
		1127	req->dataptr = (char *)svptr + dataoffset;
		1128
		1129	if (!SvREADONLY (data))
		1130	{
		1131	SvREADONLY_on (data);
		1132	req->data2ptr = (void *)data;
		1133	}
		1134
		1135	REQ_SEND;
		1136	}
		1137	}
		1138
		1139	void
		1140	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1141	SV * out_fh
		1142	SV * in_fh
		1143	UV in_offset
		1144	UV length
		1145	SV * callback
		1146	PROTOTYPE: $$$$;$
		1147	PPCODE:
		1148	{
		1149	dREQ;
		1150
		1151	req->type = REQ_SENDFILE;
		1152	req->fh = newSVsv (out_fh);
		1153	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1154	req->fh2 = newSVsv (in_fh);
		1155	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1156	req->offset = in_offset;
487	req->length = length;	1157	req->length = length;
488	req->data = SvREFCNT_inc (data);
489	req->dataptr = (char *)svptr + dataoffset;
490	req->callback = SvREFCNT_inc (callback);
491		1158
492	send_req (req);	1159	REQ_SEND;
493	}	1160	}
494		1161
495	void	1162	void
496	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1163	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
497	SV * fh	1164	SV * fh
498	UV offset	1165	UV offset
499	IV length	1166	IV length
500	SV * callback	1167	SV * callback
501	PROTOTYPE: $$$;$	1168	PROTOTYPE: $$$;$
502	CODE:	1169	PPCODE:
503	{	1170	{
504	aio_req req;	1171	dREQ;
505
506	if (length < 0)
507	croak ("length must not be negative");
508
509	Newz (0, req, 1, aio_cb);
510
511	if (!req)
512	croak ("out of memory during aio_req allocation");
513		1172
514	req->type = REQ_READAHEAD;	1173	req->type = REQ_READAHEAD;
515	req->fh = newSVsv (fh);	1174	req->fh = newSVsv (fh);
516	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1175	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
517	req->offset = offset;	1176	req->offset = offset;
518	req->length = length;	1177	req->length = length;
519	req->callback = SvREFCNT_inc (callback);
520		1178
521	send_req (req);	1179	REQ_SEND;
522	}	1180	}
523		1181
524	void	1182	void
525	aio_stat(fh_or_path,callback=&PL_sv_undef)	1183	aio_stat (fh_or_path,callback=&PL_sv_undef)
526	SV * fh_or_path	1184	SV * fh_or_path
527	SV * callback	1185	SV * callback
528	ALIAS:	1186	ALIAS:
529	aio_stat = REQ_STAT	1187	aio_stat = REQ_STAT
530	aio_lstat = REQ_LSTAT	1188	aio_lstat = REQ_LSTAT
531	CODE:	1189	PPCODE:
532	{	1190	{
533	aio_req req;	1191	dREQ;
534
535	Newz (0, req, 1, aio_cb);
536
537	if (!req)
538	croak ("out of memory during aio_req allocation");
539		1192
540	New (0, req->statdata, 1, Stat_t);	1193	New (0, req->statdata, 1, Stat_t);
541
542	if (!req->statdata)	1194	if (!req->statdata)
		1195	{
		1196	req_free (req);
543	croak ("out of memory during aio_req->statdata allocation");	1197	croak ("out of memory during aio_req->statdata allocation");
		1198	}
544		1199
545	if (SvPOK (fh_or_path))	1200	if (SvPOK (fh_or_path))
546	{	1201	{
547	req->type = ix;	1202	req->type = ix;
548	req->data = newSVsv (fh_or_path);	1203	req->data = newSVsv (fh_or_path);
549	req->dataptr = SvPV_nolen (req->data);	1204	req->dataptr = SvPVbyte_nolen (req->data);
550	}	1205	}
551	else	1206	else
552	{	1207	{
553	req->type = REQ_FSTAT;	1208	req->type = REQ_FSTAT;
554	req->fh = newSVsv (fh_or_path);	1209	req->fh = newSVsv (fh_or_path);
555	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1210	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
556	}	1211	}
557		1212
558	req->callback = SvREFCNT_inc (callback);	1213	REQ_SEND;
559
560	send_req (req);
561	}	1214	}
562		1215
563	void	1216	void
564	aio_unlink(pathname,callback=&PL_sv_undef)	1217	aio_unlink (pathname,callback=&PL_sv_undef)
565	SV * pathname	1218	SV * pathname
566	SV * callback	1219	SV * callback
		1220	ALIAS:
		1221	aio_unlink = REQ_UNLINK
		1222	aio_rmdir = REQ_RMDIR
		1223	aio_readdir = REQ_READDIR
		1224	PPCODE:
		1225	{
		1226	dREQ;
		1227
		1228	req->type = ix;
		1229	req->data = newSVsv (pathname);
		1230	req->dataptr = SvPVbyte_nolen (req->data);
		1231
		1232	REQ_SEND;
		1233	}
		1234
		1235	void
		1236	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1237	SV * oldpath
		1238	SV * newpath
		1239	SV * callback
		1240	ALIAS:
		1241	aio_link = REQ_LINK
		1242	aio_symlink = REQ_SYMLINK
		1243	aio_rename = REQ_RENAME
		1244	PPCODE:
		1245	{
		1246	dREQ;
		1247
		1248	req->type = ix;
		1249	req->fh = newSVsv (oldpath);
		1250	req->data2ptr = SvPVbyte_nolen (req->fh);
		1251	req->data = newSVsv (newpath);
		1252	req->dataptr = SvPVbyte_nolen (req->data);
		1253
		1254	REQ_SEND;
		1255	}
		1256
		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)
567	CODE:	1302	CODE:
568	{	1303	if (pri < PRI_MIN) pri = PRI_MIN;
569	aio_req req;	1304	if (pri > PRI_MAX) pri = PRI_MAX;
570		1305	next_pri = pri + PRI_BIAS;
571	Newz (0, req, 1, aio_cb);
572
573	if (!req)
574	croak ("out of memory during aio_req allocation");
575
576	req->type = REQ_UNLINK;
577	req->data = newSVsv (pathname);
578	req->dataptr = SvPV_nolen (req->data);
579	req->callback = SvREFCNT_inc (callback);
580
581	send_req (req);
582	}
583		1306
		1307	#endif
		1308
584	void	1309	void
585	flush()	1310	flush ()
586	PROTOTYPE:	1311	PROTOTYPE:
587	CODE:	1312	CODE:
588	while (nreqs)	1313	while (nreqs)
589	{	1314	{
590	poll_wait ();	1315	poll_wait ();
…		…
630	CODE:	1355	CODE:
631	RETVAL = nreqs;	1356	RETVAL = nreqs;
632	OUTPUT:	1357	OUTPUT:
633	RETVAL	1358	RETVAL
634		1359
		1360	PROTOTYPES: DISABLE
		1361
		1362	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1363
		1364	void
		1365	cancel (aio_req_ornot req)
		1366	CODE:
		1367	req_cancel (req);
		1368
		1369	void
		1370	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1371	CODE:
		1372	SvREFCNT_dec (req->callback);
		1373	req->callback = newSVsv (callback);
		1374
		1375	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1376
		1377	void
		1378	add (aio_req grp, ...)
		1379	PPCODE:
		1380	{
		1381	int i;
		1382	aio_req req;
		1383
		1384	if (grp->fd == 2)
		1385	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1386
		1387	for (i = 1; i < items; ++i )
		1388	{
		1389	if (GIMME_V != G_VOID)
		1390	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1391
		1392	req = SvAIO_REQ (ST (i));
		1393
		1394	if (req)
		1395	{
		1396	++grp->length;
		1397	req->grp = grp;
		1398
		1399	req->grp_prev = 0;
		1400	req->grp_next = grp->grp_first;
		1401
		1402	if (grp->grp_first)
		1403	grp->grp_first->grp_prev = req;
		1404
		1405	grp->grp_first = req;
		1406	}
		1407	}
		1408	}
		1409
		1410	void
		1411	result (aio_req grp, ...)
		1412	CODE:
		1413	{
		1414	int i;
		1415	AV *av = newAV ();
		1416
		1417	for (i = 1; i < items; ++i )
		1418	av_push (av, newSVsv (ST (i)));
		1419
		1420	SvREFCNT_dec (grp->data);
		1421	grp->data = (SV *)av;
		1422	}
		1423
		1424	void
		1425	feed_limit (aio_req grp, int limit)
		1426	CODE:
		1427	grp->fd2 = limit;
		1428	aio_grp_feed (grp);
		1429
		1430	void
		1431	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1432	CODE:
		1433	{
		1434	SvREFCNT_dec (grp->fh2);
		1435	grp->fh2 = newSVsv (callback);
		1436
		1437	if (grp->fd2 <= 0)
		1438	grp->fd2 = 2;
		1439
		1440	aio_grp_feed (grp);
		1441	}
		1442

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