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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.7 by root, Mon Jul 11 01:49:14 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
		13	#include "autoconf/config.h"
		14
		15	#include <pthread.h>
		16
		17	#include <stddef.h>
		18	#include <errno.h>
		19	#include <sys/time.h>
		20	#include <sys/select.h>
5	#include <sys/types.h>	21	#include <sys/types.h>
6	#include <sys/stat.h>	22	#include <sys/stat.h>
		23	#include <limits.h>
7	#include <unistd.h>	24	#include <unistd.h>
8	#include <fcntl.h>	25	#include <fcntl.h>
9	#include <signal.h>	26	#include <signal.h>
10	#include <sched.h>	27	#include <sched.h>
11	#include <endian.h>
12		28
13	#include <pthread.h>	29	#if HAVE_SENDFILE
		30	# if __linux
		31	# include <sys/sendfile.h>
		32	# elif __freebsd
14	#include <sys/syscall.h>	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
15		43
16	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	44	/* used for struct dirent, AIX doesn't provide it */
17	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	45	#ifndef NAME_MAX
18	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	46	# define NAME_MAX 4096
		47	#endif
19		48
20	#if __ia64	49	#if __ia64
21	# define STACKSIZE 65536	50	# define STACKSIZE 65536
		51	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		52	# define STACKSIZE PTHREAD_STACK_MIN
22	#else	53	#else
23	# define STACKSIZE 4096	54	# define STACKSIZE 16384
24	#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)
25		66
26	enum {	67	enum {
27	REQ_QUIT,	68	REQ_QUIT,
28	REQ_OPEN, REQ_CLOSE,	69	REQ_OPEN, REQ_CLOSE,
29	REQ_READ, REQ_WRITE, REQ_READAHEAD,	70	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		71	REQ_SENDFILE,
30	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	72	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
31	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,
32	};	79	};
33		80
		81	#define AIO_REQ_KLASS "IO::AIO::REQ"
		82	#define AIO_GRP_KLASS "IO::AIO::GRP"
		83
34	typedef struct aio_cb {	84	typedef struct aio_cb
		85	{
35	struct aio_cb *volatile next;	86	struct aio_cb *volatile next;
36		87
37	int type;	88	SV *data, *callback;
38		89	SV *fh, *fh2;
39	int fd;	90	void *dataptr, *data2ptr;
		91	Stat_t *statdata;
40	off_t offset;	92	off_t offset;
41	size_t length;	93	size_t length;
42	ssize_t result;	94	ssize_t result;
		95
		96	STRLEN dataoffset;
		97	int type;
		98	int fd, fd2;
		99	int errorno;
43	mode_t mode; /* open */	100	mode_t mode; /* open */
44	int errorno;
45	SV *data, *callback;
46	void *dataptr;
47	STRLEN dataoffset;
48		101
49	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;
50	} aio_cb;	107	} aio_cb;
51		108
		109	enum {
		110	FLAG_CANCELLED = 0x01,
		111	};
		112
52	typedef aio_cb *aio_req;	113	typedef aio_cb *aio_req;
		114	typedef aio_cb *aio_req_ornot;
53		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
54	static int started;	126	static int started, wanted;
55	static int nreqs;	127	static volatile int nreqs;
56	static int max_outstanding = 1<<30;	128	static int max_outstanding = 1<<30;
57	static int respipe [2];	129	static int respipe [2];
58		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
59	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	137	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
60	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	138	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
61	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	139	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
62		140
63	static volatile aio_req reqs, reqe; /* queue start, queue end */	141	static volatile aio_req reqs, reqe; /* queue start, queue end */
64	static volatile aio_req ress, rese; /* queue start, queue end */	142	static volatile aio_req ress, rese; /* queue start, queue end */
65		143
66	static void	144	static void req_invoke (aio_req req);
67	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)
68	{	149	{
69	if (!nreqs)	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	{
		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	{
		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
		235	FD_ZERO(&rfd);
		236	FD_SET(respipe [0], &rfd);
		237
		238	select (respipe [0] + 1, &rfd, 0, 0, 0);
		239	}
		240	}
		241
		242	static void req_invoke (aio_req req)
		243	{
		244	dSP;
		245	int errorno = errno;
		246
		247	if (req->flags & FLAG_CANCELLED || !SvOK (req->callback))
70	return;	248	return;
71		249
72	fd_set rfd;	250	errno = req->errorno;
73	FD_ZERO(&rfd);
74	FD_SET(respipe [0], &rfd);
75		251
76	select (respipe [0] + 1, &rfd, 0, 0, 0);	252	ENTER;
77	}	253	SAVETMPS;
		254	PUSHMARK (SP);
		255	EXTEND (SP, 1);
78		256
79	static int	257	switch (req->type)
80	poll_cb ()	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 ()
81	{	389	{
82	dSP;	390	dSP;
83	int count = 0;	391	int count = 0;
		392	int do_croak = 0;
84	aio_req req;	393	aio_req req;
85
86	{
87	/* read and signals sent by the worker threads */
88	char buf [32];
89	while (read (respipe [0], buf, 32) > 0)
90	;
91	}
92		394
93	for (;;)	395	for (;;)
94	{	396	{
95	pthread_mutex_lock (&reslock);	397	pthread_mutex_lock (&reslock);
96
97	req = ress;	398	req = ress;
98		399
99	if (ress)	400	if (req)
100	{	401	{
101	ress = ress->next;	402	ress = req->next;
		403
102	if (!ress) rese = 0;	404	if (!ress)
		405	{
		406	/* read any signals sent by the worker threads */
		407	char buf [32];
		408	while (read (respipe [0], buf, 32) == 32)
		409	;
		410
		411	rese = 0;
		412	}
103	}	413	}
104		414
105	pthread_mutex_unlock (&reslock);	415	pthread_mutex_unlock (&reslock);
106		416
107	if (!req)	417	if (!req)
108	break;	418	break;
109		419
110	nreqs--;	420	--nreqs;
111		421
112	if (req->type == REQ_QUIT)	422	if (req->type == REQ_QUIT)
113	started--;	423	started--;
		424	else if (req->type == REQ_GROUP && req->length)
		425	{
		426	req->fd = 1; /* mark request as delayed */
		427	continue;
		428	}
114	else	429	else
115	{	430	{
116	int errorno = errno;
117	errno = req->errorno;
118
119	if (req->type == REQ_READ)	431	if (req->type == REQ_READ)
120	SvCUR_set (req->data, req->dataoffset	432	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
121	+ req->result > 0 ? req->result : 0);
122		433
		434	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		435	SvREADONLY_off (req->data);
		436
123	if (req->data)	437	if (req->statdata)
124	SvREFCNT_dec (req->data);
125
126	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
127	{	438	{
128	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	439	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
129	PL_laststatval = req->result;	440	PL_laststatval = req->result;
130	PL_statcache = *(req->statdata);	441	PL_statcache = *(req->statdata);
131
132	Safefree (req->statdata);
133	}	442	}
134		443
135	PUSHMARK (SP);	444	req_invoke (req);
136	XPUSHs (sv_2mortal (newSViv (req->result)));
137		445
138	if (req->type == REQ_OPEN)
139	{
140	/* convert fd to fh */
141	SV *fh;
142
143	PUTBACK;
144	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
145	SPAGAIN;
146
147	fh = POPs;
148
149	PUSHMARK (SP);
150	XPUSHs (fh);
151	}
152
153	PUTBACK;
154	call_sv (req->callback, G_VOID | G_EVAL);
155	SPAGAIN;
156
157	if (req->callback)
158	SvREFCNT_dec (req->callback);
159
160	errno = errorno;
161	count++;	446	count++;
162	}	447	}
163		448
164	Safefree (req);	449	req_free (req);
165	}	450	}
166		451
167	return count;	452	return count;
168	}	453	}
169		454
170	static void *aio_proc(void *arg);	455	static void *aio_proc(void *arg);
171		456
172	static void
173	start_thread (void)	457	static void start_thread (void)
174	{	458	{
175	sigset_t fullsigset, oldsigset;	459	sigset_t fullsigset, oldsigset;
176	pthread_t tid;	460	pthread_t tid;
177	pthread_attr_t attr;	461	pthread_attr_t attr;
178		462
…		…
187	started++;	471	started++;
188		472
189	sigprocmask (SIG_SETMASK, &oldsigset, 0);	473	sigprocmask (SIG_SETMASK, &oldsigset, 0);
190	}	474	}
191		475
192	static void	476	static void req_send (aio_req req)
193	send_req (aio_req req)
194	{	477	{
		478	while (started < wanted && nreqs >= started)
		479	start_thread ();
		480
195	nreqs++;	481	++nreqs;
196		482
197	pthread_mutex_lock (&reqlock);	483	pthread_mutex_lock (&reqlock);
198		484
199	req->next = 0;	485	req->next = 0;
200		486
…		…
207	reqe = reqs = req;	493	reqe = reqs = req;
208		494
209	pthread_cond_signal (&reqwait);	495	pthread_cond_signal (&reqwait);
210	pthread_mutex_unlock (&reqlock);	496	pthread_mutex_unlock (&reqlock);
211		497
212	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)
213	{	539	{
214	poll_wait ();	540	poll_wait ();
215	poll_cb ();	541	poll_cb ();
216	}	542	}
217	}	543	}
218		544
219	static void	545	static void create_pipe ()
220	end_thread (void)
221	{	546	{
222	aio_req req;	547	if (pipe (respipe))
223	New (0, req, 1, aio_cb);	548	croak ("unable to initialize result pipe");
224	req->type = REQ_QUIT;
225		549
226	send_req (req);	550	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
227	}	551	croak ("cannot set result pipe to nonblocking mode");
228		552
229	static void	553	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
230	read_write (int dowrite, int fd, off_t offset, size_t length,	554	croak ("cannot set result pipe to nonblocking mode");
231	SV *data, STRLEN dataoffset, SV *callback)	555	}
232	{
233	aio_req req;
234	STRLEN svlen;
235	char *svptr = SvPV (data, svlen);
236		556
237	SvUPGRADE (data, SVt_PV);	557	/*****************************************************************************/
238	SvPOK_on (data);	558	/* work around various missing functions */
239		559
240	if (dataoffset < 0)	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);
241	dataoffset += svlen;	618	offset += len;
242		619	count -= len;
243	if (dataoffset < 0 || dataoffset > svlen)
244	croak ("data offset outside of string");
245
246	if (dowrite)
247	{	620	}
248	/* write: check length and adjust. */	621
249	if (length < 0 || length + dataoffset > svlen)	622	fBUF;
250	length = svlen - dataoffset;	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);
251	}	647	}
252	else	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 (;;)
253	{	778	{
254	/* read: grow scalar as necessary */	779	errno = 0;
255	svptr = SvGROW (data, length + dataoffset);	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	}
256	}	804	}
257		805
258	if (length < 0)	806	errorno = errno;
259	croak ("length must not be negative");	807	free (u);
		808	closedir (dirp);
260		809
261	Newz (0, req, 1, aio_cb);	810	if (errorno)
		811	{
		812	free (names);
		813	errno = errorno;
		814	res = -1;
		815	}
262		816
263	if (!req)	817	*namesp = (void *)names;
264	croak ("out of memory during aio_req allocation");	818	return res;
265
266	req->type = dowrite ? REQ_WRITE : REQ_READ;
267	req->fd = fd;
268	req->offset = offset;
269	req->length = length;
270	req->data = SvREFCNT_inc (data);
271	req->dataptr = (char *)svptr + dataoffset;
272	req->callback = SvREFCNT_inc (callback);
273
274	send_req (req);
275	}	819	}
276		820
277	static void *	821	/*****************************************************************************/
		822
278	aio_proc (void *thr_arg)	823	static void *aio_proc (void *thr_arg)
279	{	824	{
280	aio_req req;	825	aio_req req;
281	int type;	826	int type;
282		827
283	do	828	do
…		…
301	}	846	}
302		847
303	pthread_mutex_unlock (&reqlock);	848	pthread_mutex_unlock (&reqlock);
304		849
305	errno = 0; /* strictly unnecessary */	850	errno = 0; /* strictly unnecessary */
		851	type = req->type; /* remember type for QUIT check */
306		852
307	type = req->type;	853	if (!(req->flags & FLAG_CANCELLED))
308
309	switch (type)	854	switch (type)
310	{	855	{
311	case REQ_READ: req->result = pread64 (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;
312	case REQ_WRITE: req->result = pwrite64 (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;
313	#if SYS_readahead	858
314	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;
315	#else	860	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
316	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
317	#endif
318		861
319	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	862	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
320	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	863	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
321	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	864	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
322		865
323	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;
324	case REQ_CLOSE: req->result = close (req->fd); break;	867	case REQ_CLOSE: req->result = close (req->fd); break;
325	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	868	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
326
327	case REQ_FSYNC: req->result = fsync (req->fd); 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;
		873
328	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	874	case REQ_FDATASYNC: req->result = fdatasync (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;
329		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:
330	case REQ_QUIT:	890	case REQ_QUIT:
331	break;	891	break;
332		892
333	default:	893	default:
334	req->result = ENOSYS;	894	req->result = ENOSYS;
335	break;	895	break;
336	}	896	}
337		897
338	req->errorno = errno;	898	req->errorno = errno;
339		899
340	pthread_mutex_lock (&reslock);	900	pthread_mutex_lock (&reslock);
341		901
…		…
359	while (type != REQ_QUIT);	919	while (type != REQ_QUIT);
360		920
361	return 0;	921	return 0;
362	}	922	}
363		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
364	MODULE = IO::AIO PACKAGE = IO::AIO	1002	MODULE = IO::AIO PACKAGE = IO::AIO
365		1003
		1004	PROTOTYPES: ENABLE
		1005
366	BOOT:	1006	BOOT:
367	{	1007	{
368	if (pipe (respipe))	1008	HV *stash = gv_stashpv ("IO::AIO", 1);
369	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));
370		1012
371	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	1013	create_pipe ();
372	croak ("cannot set result pipe to nonblocking mode");	1014	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
373
374	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
375	croak ("cannot set result pipe to nonblocking mode");
376	}	1015	}
377		1016
378	void	1017	void
379	min_parallel(nthreads)	1018	min_parallel (nthreads)
380	int nthreads	1019	int nthreads
381	PROTOTYPE: $	1020	PROTOTYPE: $
382	CODE:
383	while (nthreads > started)
384	start_thread ();
385		1021
386	void	1022	void
387	max_parallel(nthreads)	1023	max_parallel (nthreads)
388	int nthreads	1024	int nthreads
389	PROTOTYPE: $	1025	PROTOTYPE: $
390	CODE:
391	{
392	int cur = started;
393	while (cur > nthreads)
394	{
395	end_thread ();
396	cur--;
397	}
398
399	while (started > nthreads)
400	{
401	poll_wait ();
402	poll_cb ();
403	}
404	}
405		1026
406	int	1027	int
407	max_outstanding(nreqs)	1028	max_outstanding (nreqs)
408	int nreqs	1029	int nreqs
409	PROTOTYPE: $	1030	PROTOTYPE: $
410	CODE:	1031	CODE:
411	RETVAL = max_outstanding;	1032	RETVAL = max_outstanding;
412	max_outstanding = nreqs;	1033	max_outstanding = nreqs;
413		1034
414	void	1035	void
415	aio_open(pathname,flags,mode,callback)	1036	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
416	SV * pathname	1037	SV * pathname
417	int flags	1038	int flags
418	int mode	1039	int mode
419	SV * callback	1040	SV * callback
420	PROTOTYPE: $$$$	1041	PROTOTYPE: $$$;$
421	CODE:	1042	PPCODE:
422	{	1043	{
423	aio_req req;	1044	dREQ;
424
425	Newz (0, req, 1, aio_cb);
426
427	if (!req)
428	croak ("out of memory during aio_req allocation");
429		1045
430	req->type = REQ_OPEN;	1046	req->type = REQ_OPEN;
431	req->data = newSVsv (pathname);	1047	req->data = newSVsv (pathname);
432	req->dataptr = SvPV_nolen (req->data);	1048	req->dataptr = SvPVbyte_nolen (req->data);
433	req->fd = flags;	1049	req->fd = flags;
434	req->mode = mode;	1050	req->mode = mode;
435	req->callback = SvREFCNT_inc (callback);
436		1051
437	send_req (req);	1052	REQ_SEND;
438	}	1053	}
439		1054
440	void	1055	void
441	aio_close(fh,callback)	1056	aio_close (fh,callback=&PL_sv_undef)
442	InputStream fh	1057	SV * fh
443	SV * callback	1058	SV * callback
444	PROTOTYPE: $$	1059	PROTOTYPE: $;$
445	ALIAS:	1060	ALIAS:
446	aio_close = REQ_CLOSE	1061	aio_close = REQ_CLOSE
447	aio_fsync = REQ_FSYNC	1062	aio_fsync = REQ_FSYNC
448	aio_fdatasync = REQ_FDATASYNC	1063	aio_fdatasync = REQ_FDATASYNC
449	CODE:	1064	PPCODE:
		1065	{
		1066	dREQ;
		1067
		1068	req->type = ix;
		1069	req->fh = newSVsv (fh);
		1070	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
		1071
		1072	REQ_SEND (req);
		1073	}
		1074
		1075	void
		1076	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
		1077	SV * fh
		1078	UV offset
		1079	UV length
		1080	SV * data
		1081	UV dataoffset
		1082	SV * callback
		1083	ALIAS:
		1084	aio_read = REQ_READ
		1085	aio_write = REQ_WRITE
		1086	PROTOTYPE: $$$$$;$
		1087	PPCODE:
450	{	1088	{
451	aio_req req;	1089	aio_req req;
		1090	STRLEN svlen;
		1091	char *svptr = SvPVbyte (data, svlen);
452		1092
453	Newz (0, req, 1, aio_cb);	1093	SvUPGRADE (data, SVt_PV);
		1094	SvPOK_on (data);
454		1095
455	if (!req)	1096	if (dataoffset < 0)
456	croak ("out of memory during aio_req allocation");	1097	dataoffset += svlen;
457		1098
458	req->type = ix;	1099	if (dataoffset < 0 || dataoffset > svlen)
459	req->fd = PerlIO_fileno (fh);	1100	croak ("data offset outside of string");
460	req->callback = SvREFCNT_inc (callback);
461		1101
462	send_req (req);	1102	if (ix == REQ_WRITE)
463	}	1103	{
464		1104	/* write: check length and adjust. */
465	void	1105	if (length < 0 || length + dataoffset > svlen)
466	aio_read(fh,offset,length,data,dataoffset,callback)	1106	length = svlen - dataoffset;
467	InputStream fh	1107	}
468	UV offset	1108	else
469	IV length	1109	{
470	SV * data	1110	/* read: grow scalar as necessary */
471	IV dataoffset	1111	svptr = SvGROW (data, length + dataoffset);
472	SV * callback	1112	}
473	PROTOTYPE: $$$$$$
474	CODE:
475	read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
476
477	void
478	aio_write(fh,offset,length,data,dataoffset,callback)
479	OutputStream fh
480	UV offset
481	IV length
482	SV * data
483	IV dataoffset
484	SV * callback
485	PROTOTYPE: $$$$$$
486	CODE:
487	read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
488
489	void
490	aio_readahead(fh,offset,length,callback)
491	InputStream fh
492	UV offset
493	IV length
494	SV * callback
495	PROTOTYPE: $$$$
496	CODE:
497	{
498	aio_req req;
499		1113
500	if (length < 0)	1114	if (length < 0)
501	croak ("length must not be negative");	1115	croak ("length must not be negative");
502		1116
503	Newz (0, req, 1, aio_cb);	1117	{
		1118	dREQ;
504		1119
505	if (!req)	1120	req->type = ix;
506	croak ("out of memory during aio_req allocation");	1121	req->fh = newSVsv (fh);
		1122	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
		1123	: IoOFP (sv_2io (fh)));
		1124	req->offset = offset;
		1125	req->length = length;
		1126	req->data = SvREFCNT_inc (data);
		1127	req->dataptr = (char *)svptr + dataoffset;
		1128
		1129	if (!SvREADONLY (data))
		1130	{
		1131	SvREADONLY_on (data);
		1132	req->data2ptr = (void *)data;
		1133	}
		1134
		1135	REQ_SEND;
		1136	}
		1137	}
		1138
		1139	void
		1140	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1141	SV * out_fh
		1142	SV * in_fh
		1143	UV in_offset
		1144	UV length
		1145	SV * callback
		1146	PROTOTYPE: $$$$;$
		1147	PPCODE:
		1148	{
		1149	dREQ;
		1150
		1151	req->type = REQ_SENDFILE;
		1152	req->fh = newSVsv (out_fh);
		1153	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1154	req->fh2 = newSVsv (in_fh);
		1155	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1156	req->offset = in_offset;
		1157	req->length = length;
		1158
		1159	REQ_SEND;
		1160	}
		1161
		1162	void
		1163	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
		1164	SV * fh
		1165	UV offset
		1166	IV length
		1167	SV * callback
		1168	PROTOTYPE: $$$;$
		1169	PPCODE:
		1170	{
		1171	dREQ;
507		1172
508	req->type = REQ_READAHEAD;	1173	req->type = REQ_READAHEAD;
		1174	req->fh = newSVsv (fh);
509	req->fd = PerlIO_fileno (fh);	1175	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
510	req->offset = offset;	1176	req->offset = offset;
511	req->length = length;	1177	req->length = length;
512	req->callback = SvREFCNT_inc (callback);
513		1178
514	send_req (req);	1179	REQ_SEND;
515	}	1180	}
516		1181
517	void	1182	void
518	aio_stat(fh_or_path,callback)	1183	aio_stat (fh_or_path,callback=&PL_sv_undef)
519	SV * fh_or_path	1184	SV * fh_or_path
520	SV * callback	1185	SV * callback
521	PROTOTYPE: $$
522	ALIAS:	1186	ALIAS:
		1187	aio_stat = REQ_STAT
523	aio_lstat = 1	1188	aio_lstat = REQ_LSTAT
524	CODE:	1189	PPCODE:
525	{	1190	{
526	aio_req req;	1191	dREQ;
527
528	Newz (0, req, 1, aio_cb);
529
530	if (!req)
531	croak ("out of memory during aio_req allocation");
532		1192
533	New (0, req->statdata, 1, Stat_t);	1193	New (0, req->statdata, 1, Stat_t);
534
535	if (!req->statdata)	1194	if (!req->statdata)
		1195	{
		1196	req_free (req);
536	croak ("out of memory during aio_req->statdata allocation");	1197	croak ("out of memory during aio_req->statdata allocation");
		1198	}
537		1199
538	if (SvPOK (fh_or_path))	1200	if (SvPOK (fh_or_path))
539	{	1201	{
540	req->type = ix ? REQ_LSTAT : REQ_STAT;	1202	req->type = ix;
541	req->data = newSVsv (fh_or_path);	1203	req->data = newSVsv (fh_or_path);
542	req->dataptr = SvPV_nolen (req->data);	1204	req->dataptr = SvPVbyte_nolen (req->data);
543	}	1205	}
544	else	1206	else
545	{	1207	{
546	req->type = REQ_FSTAT;	1208	req->type = REQ_FSTAT;
		1209	req->fh = newSVsv (fh_or_path);
547	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1210	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
548	}	1211	}
549		1212
550	req->callback = SvREFCNT_inc (callback);	1213	REQ_SEND;
551
552	send_req (req);
553	}	1214	}
554		1215
555	void	1216	void
556	aio_unlink(pathname,callback)	1217	aio_unlink (pathname,callback=&PL_sv_undef)
557	SV * pathname	1218	SV * pathname
558	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
559	PROTOTYPE: $$	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)
560	CODE:	1302	CODE:
561	{	1303	if (pri < PRI_MIN) pri = PRI_MIN;
562	aio_req req;	1304	if (pri > PRI_MAX) pri = PRI_MAX;
563		1305	next_pri = pri + PRI_BIAS;
564	Newz (0, req, 1, aio_cb);
565
566	if (!req)
567	croak ("out of memory during aio_req allocation");
568
569	req->type = REQ_UNLINK;
570	req->data = newSVsv (pathname);
571	req->dataptr = SvPV_nolen (req->data);
572	req->callback = SvREFCNT_inc (callback);
573
574	send_req (req);
575	}
576		1306
		1307	#endif
		1308
577	void	1309	void
578	flush()	1310	flush ()
579	PROTOTYPE:	1311	PROTOTYPE:
580	CODE:	1312	CODE:
581	while (nreqs)	1313	while (nreqs)
582	{	1314	{
583	poll_wait ();	1315	poll_wait ();
…		…
623	CODE:	1355	CODE:
624	RETVAL = nreqs;	1356	RETVAL = nreqs;
625	OUTPUT:	1357	OUTPUT:
626	RETVAL	1358	RETVAL
627		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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