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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.2 by root, Sun Jul 10 18:16:49 2005 UTC vs.
Revision 1.64 by root, Mon Oct 23 23:54:41 2006 UTC

1	#define PERL_NO_GET_CONTEXT	1	#if __linux
		2	# define _GNU_SOURCE
		3	#endif
		4
		5	#define _REENTRANT 1
		6
		7	#include <errno.h>
2		8
3	#include "EXTERN.h"	9	#include "EXTERN.h"
4	#include "perl.h"	10	#include "perl.h"
5	#include "XSUB.h"	11	#include "XSUB.h"
6		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>
7	#include <sys/types.h>	21	#include <sys/types.h>
8	#include <sys/stat.h>	22	#include <sys/stat.h>
		23	#include <limits.h>
9	#include <unistd.h>	24	#include <unistd.h>
10	#include <fcntl.h>	25	#include <fcntl.h>
11	#include <signal.h>	26	#include <signal.h>
12	#include <sched.h>	27	#include <sched.h>
13	#include <endian.h>
14		28
15	#include <pthread.h>	29	#if HAVE_SENDFILE
		30	# if __linux
		31	# include <sys/sendfile.h>
		32	# elif __freebsd
16	#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
17		43
18	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	44	/* used for struct dirent, AIX doesn't provide it */
19	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	45	#ifndef NAME_MAX
20	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	46	# define NAME_MAX 4096
		47	#endif
21		48
22	#if __i386 || __amd64
23	# define STACKSIZE ( 256 * sizeof (long))
24	#elif __ia64	49	#if __ia64
25	# define STACKSIZE (8192 * sizeof (long))	50	# define STACKSIZE 65536
26	#else	51	#else
27	# define STACKSIZE ( 512 * sizeof (long))	52	# define STACKSIZE 8192
28	#endif	53	#endif
29		54
30	enum {	55	enum {
31	REQ_QUIT,	56	REQ_QUIT,
32	REQ_OPEN, REQ_CLOSE,	57	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,	58	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		59	REQ_SENDFILE,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	60	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35	REQ_FSYNC, REQ_FDATASYNC,	61	REQ_FSYNC, REQ_FDATASYNC,
		62	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
		63	REQ_READDIR,
		64	REQ_LINK, REQ_SYMLINK,
		65	REQ_GROUP, REQ_NOP,
		66	REQ_SLEEP,
36	};	67	};
37		68
		69	#define AIO_REQ_KLASS "IO::AIO::REQ"
		70	#define AIO_GRP_KLASS "IO::AIO::GRP"
		71
38	typedef struct aio_cb {	72	typedef struct aio_cb
		73	{
39	struct aio_cb *next;	74	struct aio_cb *volatile next;
40		75
41	int type;	76	SV *data, *callback;
42		77	SV *fh, *fh2;
43	int fd;	78	void *dataptr, *data2ptr;
		79	Stat_t *statdata;
44	off_t offset;	80	off_t offset;
45	size_t length;	81	size_t length;
46	ssize_t result;	82	ssize_t result;
		83
		84	STRLEN dataoffset;
		85	int type;
		86	int fd, fd2;
		87	int errorno;
47	mode_t mode; /* open */	88	mode_t mode; /* open */
48	int errorno;
49	SV *data, *callback;
50	void *dataptr;
51	STRLEN dataoffset;
52		89
53	Stat_t *statdata;	90	unsigned char flags;
		91	unsigned char pri;
		92
		93	SV *self; /* the perl counterpart of this request, if any */
		94	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
54	} aio_cb;	95	} aio_cb;
55		96
		97	enum {
		98	FLAG_CANCELLED = 0x01,
		99	};
		100
56	typedef aio_cb *aio_req;	101	typedef aio_cb *aio_req;
		102	typedef aio_cb *aio_req_ornot;
57		103
		104	enum {
		105	PRI_MIN = -4,
		106	PRI_MAX = 4,
		107
		108	DEFAULT_PRI = 0,
		109	PRI_BIAS = -PRI_MIN,
		110	};
		111
		112	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		113
58	static int started;	114	static int started, wanted;
59	static int nreqs;	115	static volatile int nreqs;
		116	static int max_outstanding = 1<<30;
60	static int reqpipe[2], respipe[2];	117	static int respipe [2];
61		118
		119	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		120	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		121	#else
		122	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
		123	#endif
		124
		125	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
		126	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
		127	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
		128
62	static aio_req qs, qe; /* queue start, queue end */	129	static volatile aio_req reqs, reqe; /* queue start, queue end */
		130	static volatile aio_req ress, rese; /* queue start, queue end */
63		131
64	static void *aio_proc(void *arg);	132	static void req_invoke (aio_req req);
		133	static void req_free (aio_req req);
65		134
66	static void	135	/* must be called at most once */
67	start_thread (void)	136	static SV *req_sv (aio_req req, const char *klass)
68	{	137	{
69	sigset_t fullsigset, oldsigset;	138	if (!req->self)
70	pthread_t tid;
71	pthread_attr_t attr;
72
73	pthread_attr_init (&attr);
74	pthread_attr_setstacksize (&attr, STACKSIZE);
75	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
76
77	sigfillset (&fullsigset);
78	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
79
80	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
81	started++;
82
83	sigprocmask (SIG_SETMASK, &oldsigset, 0);
84	}
85
86	static void
87	send_reqs (void)
88	{
89	/* this write is atomic */
90	while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs)
91	{	139	{
92	qs = qs->next;	140	req->self = (SV *)newHV ();
93	if (!qs) qe = 0;	141	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
94	}	142	}
95	}
96		143
97	static void	144	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
98	send_req (aio_req req)	145	}
99	{
100	nreqs++;
101	req->next = 0;
102		146
103	if (qe)	147	static aio_req SvAIO_REQ (SV *sv)
104	{	148	{
105	qe->next = req;	149	MAGIC *mg;
106	qe = req;	150
		151	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		152	croak ("object of class " AIO_REQ_KLASS " expected");
		153
		154	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		155
		156	return mg ? (aio_req)mg->mg_ptr : 0;
		157	}
		158
		159	static void aio_grp_feed (aio_req grp)
		160	{
		161	while (grp->length < grp->fd2 && !(grp->flags & FLAG_CANCELLED))
107	}	162	{
108	else	163	int old_len = grp->length;
109	qe = qs = req;
110		164
111	send_reqs ();	165	if (grp->fh2 && SvOK (grp->fh2))
112	}	166	{
		167	dSP;
113		168
114	static void	169	ENTER;
115	end_thread (void)	170	SAVETMPS;
116	{	171	PUSHMARK (SP);
117	aio_req req;	172	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
118	New (0, req, 1, aio_cb);	173	PUTBACK;
119	req->type = REQ_QUIT;	174	call_sv (grp->fh2, G_VOID | G_EVAL);
		175	SPAGAIN;
		176	FREETMPS;
		177	LEAVE;
		178	}
120		179
121	send_req (req);	180	/* stop if no progress has been made */
122	}	181	if (old_len == grp->length)
123		182	{
124	static void	183	SvREFCNT_dec (grp->fh2);
125	read_write (pTHX_	184	grp->fh2 = 0;
126	int dowrite, int fd, off_t offset, size_t length,	185	break;
127	SV *data, STRLEN dataoffset, SV *callback)	186	}
128	{
129	aio_req req;
130	STRLEN svlen;
131	char *svptr = SvPV (data, svlen);
132
133	SvUPGRADE (data, SVt_PV);
134	SvPOK_on (data);
135
136	if (dataoffset < 0)
137	dataoffset += svlen;
138
139	if (dataoffset < 0 || dataoffset > svlen)
140	croak ("data offset outside of string");
141
142	if (dowrite)
143	{	187	}
144	/* write: check length and adjust. */	188	}
145	if (length < 0 || length + dataoffset > svlen)	189
146	length = svlen - dataoffset;	190	static void aio_grp_dec (aio_req grp)
		191	{
		192	--grp->length;
		193
		194	/* call feeder, if applicable */
		195	aio_grp_feed (grp);
		196
		197	/* finish, if done */
		198	if (!grp->length && grp->fd)
147	}	199	{
148	else	200	req_invoke (grp);
		201	req_free (grp);
149	{	202	}
150	/* read: grow scalar as necessary */
151	svptr = SvGROW (data, length + dataoffset);
152	}
153
154	if (length < 0)
155	croak ("length must not be negative");
156
157	Newz (0, req, 1, aio_cb);
158
159	if (!req)
160	croak ("out of memory during aio_req allocation");
161
162	req->type = dowrite ? REQ_WRITE : REQ_READ;
163	req->fd = fd;
164	req->offset = offset;
165	req->length = length;
166	req->data = SvREFCNT_inc (data);
167	req->dataptr = (char *)svptr + dataoffset;
168	req->callback = SvREFCNT_inc (callback);
169
170	send_req (req);
171	}	203	}
172		204
173	static void	205	static void poll_wait ()
174	poll_wait ()
175	{	206	{
176	fd_set rfd;	207	fd_set rfd;
		208
		209	while (nreqs)
		210	{
		211	aio_req req;
		212	#if !(__x86 || __x86_64) /* safe without sempahore on this archs */
		213	pthread_mutex_lock (&reslock);
		214	#endif
		215	req = ress;
		216	#if !(__x86 || __x86_64) /* safe without sempahore on this archs */
		217	pthread_mutex_unlock (&reslock);
		218	#endif
		219
		220	if (req)
		221	return;
		222
177	FD_ZERO(&rfd);	223	FD_ZERO(&rfd);
178	FD_SET(respipe[0], &rfd);	224	FD_SET(respipe [0], &rfd);
179		225
180	select (respipe[0] + 1, &rfd, 0, 0, 0);	226	select (respipe [0] + 1, &rfd, 0, 0, 0);
		227	}
181	}	228	}
182		229
183	static int	230	static void req_invoke (aio_req req)
184	poll_cb (pTHX)	231	{
		232	dSP;
		233	int errorno = errno;
		234
		235	if (req->flags & FLAG_CANCELLED || !SvOK (req->callback))
		236	return;
		237
		238	errno = req->errorno;
		239
		240	ENTER;
		241	SAVETMPS;
		242	PUSHMARK (SP);
		243	EXTEND (SP, 1);
		244
		245	switch (req->type)
		246	{
		247	case REQ_READDIR:
		248	{
		249	SV *rv = &PL_sv_undef;
		250
		251	if (req->result >= 0)
		252	{
		253	char *buf = req->data2ptr;
		254	AV *av = newAV ();
		255
		256	while (req->result)
		257	{
		258	SV *sv = newSVpv (buf, 0);
		259
		260	av_push (av, sv);
		261	buf += SvCUR (sv) + 1;
		262	req->result--;
		263	}
		264
		265	rv = sv_2mortal (newRV_noinc ((SV *)av));
		266	}
		267
		268	PUSHs (rv);
		269	}
		270	break;
		271
		272	case REQ_OPEN:
		273	{
		274	/* convert fd to fh */
		275	SV *fh;
		276
		277	PUSHs (sv_2mortal (newSViv (req->result)));
		278	PUTBACK;
		279	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		280	SPAGAIN;
		281
		282	fh = SvREFCNT_inc (POPs);
		283
		284	PUSHMARK (SP);
		285	XPUSHs (sv_2mortal (fh));
		286	}
		287	break;
		288
		289	case REQ_GROUP:
		290	req->fd = 2; /* mark group as finished */
		291
		292	if (req->data)
		293	{
		294	int i;
		295	AV *av = (AV *)req->data;
		296
		297	EXTEND (SP, AvFILL (av) + 1);
		298	for (i = 0; i <= AvFILL (av); ++i)
		299	PUSHs (*av_fetch (av, i, 0));
		300	}
		301	break;
		302
		303	case REQ_NOP:
		304	case REQ_SLEEP:
		305	break;
		306
		307	default:
		308	PUSHs (sv_2mortal (newSViv (req->result)));
		309	break;
		310	}
		311
		312
		313	PUTBACK;
		314	call_sv (req->callback, G_VOID | G_EVAL);
		315	SPAGAIN;
		316
		317	FREETMPS;
		318	LEAVE;
		319
		320	errno = errorno;
		321
		322	if (SvTRUE (ERRSV))
		323	{
		324	req_free (req);
		325	croak (0);
		326	}
		327	}
		328
		329	static void req_free (aio_req req)
		330	{
		331	if (req->grp)
		332	{
		333	aio_req grp = req->grp;
		334
		335	/* unlink request */
		336	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		337	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		338
		339	if (grp->grp_first == req)
		340	grp->grp_first = req->grp_next;
		341
		342	aio_grp_dec (grp);
		343	}
		344
		345	if (req->self)
		346	{
		347	sv_unmagic (req->self, PERL_MAGIC_ext);
		348	SvREFCNT_dec (req->self);
		349	}
		350
		351	SvREFCNT_dec (req->data);
		352	SvREFCNT_dec (req->fh);
		353	SvREFCNT_dec (req->fh2);
		354	SvREFCNT_dec (req->callback);
		355	Safefree (req->statdata);
		356
		357	if (req->type == REQ_READDIR && req->result >= 0)
		358	free (req->data2ptr);
		359
		360	Safefree (req);
		361	}
		362
		363	static void req_cancel (aio_req req)
		364	{
		365	req->flags |= FLAG_CANCELLED;
		366
		367	if (req->type == REQ_GROUP)
		368	{
		369	aio_req sub;
		370
		371	for (sub = req->grp_first; sub; sub = sub->grp_next)
		372	req_cancel (sub);
		373	}
		374	}
		375
		376	static int poll_cb ()
185	{	377	{
186	dSP;	378	dSP;
187	int count = 0;	379	int count = 0;
		380	int do_croak = 0;
188	aio_req req;	381	aio_req req;
189		382
190	while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))	383	for (;;)
191	{	384	{
		385	pthread_mutex_lock (&reslock);
		386	req = ress;
		387
		388	if (req)
		389	{
		390	ress = req->next;
		391
		392	if (!ress)
		393	{
		394	/* read any signals sent by the worker threads */
		395	char buf [32];
		396	while (read (respipe [0], buf, 32) == 32)
		397	;
		398
		399	rese = 0;
		400	}
		401	}
		402
		403	pthread_mutex_unlock (&reslock);
		404
		405	if (!req)
		406	break;
		407
192	nreqs--;	408	--nreqs;
193		409
194	if (req->type == REQ_QUIT)	410	if (req->type == REQ_QUIT)
195	started--;	411	started--;
		412	else if (req->type == REQ_GROUP && req->length)
		413	{
		414	req->fd = 1; /* mark request as delayed */
		415	continue;
		416	}
196	else	417	else
197	{	418	{
198	int errorno = errno;
199	errno = req->errorno;
200
201	if (req->type == REQ_READ)	419	if (req->type == REQ_READ)
202	SvCUR_set (req->data, req->dataoffset	420	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
203	+ req->result > 0 ? req->result : 0);
204		421
		422	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		423	SvREADONLY_off (req->data);
		424
205	if (req->data)	425	if (req->statdata)
206	SvREFCNT_dec (req->data);
207
208	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
209	{	426	{
210	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	427	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
211	PL_laststatval = req->result;	428	PL_laststatval = req->result;
212	PL_statcache = *(req->statdata);	429	PL_statcache = *(req->statdata);
213
214	Safefree (req->statdata);
215	}	430	}
216		431
217	PUSHMARK (SP);	432	req_invoke (req);
218	XPUSHs (sv_2mortal (newSViv (req->result)));
219		433
220	if (req->type == REQ_OPEN)
221	{
222	/* convert fd to fh */
223	SV *fh;
224
225	PUTBACK;
226	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
227	SPAGAIN;
228
229	fh = POPs;
230
231	PUSHMARK (SP);
232	XPUSHs (fh);
233	}
234
235	PUTBACK;
236	call_sv (req->callback, G_VOID | G_EVAL);
237	SPAGAIN;
238
239	if (req->callback)
240	SvREFCNT_dec (req->callback);
241
242	errno = errorno;
243	count++;	434	count++;
244	}	435	}
245		436
246	Safefree (req);	437	req_free (req);
247	}	438	}
248
249	if (qs)
250	send_reqs ();
251		439
252	return count;	440	return count;
253	}	441	}
254		442
255	static void *	443	static void *aio_proc(void *arg);
256	aio_proc (void *thr_arg)	444
		445	static void start_thread (void)
		446	{
		447	sigset_t fullsigset, oldsigset;
		448	pthread_t tid;
		449	pthread_attr_t attr;
		450
		451	pthread_attr_init (&attr);
		452	pthread_attr_setstacksize (&attr, STACKSIZE);
		453	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		454
		455	sigfillset (&fullsigset);
		456	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
		457
		458	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
		459	started++;
		460
		461	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		462	}
		463
		464	static void req_send (aio_req req)
		465	{
		466	while (started < wanted && nreqs >= started)
		467	start_thread ();
		468
		469	++nreqs;
		470
		471	pthread_mutex_lock (&reqlock);
		472
		473	req->next = 0;
		474
		475	if (reqe)
		476	{
		477	reqe->next = req;
		478	reqe = req;
		479	}
		480	else
		481	reqe = reqs = req;
		482
		483	pthread_cond_signal (&reqwait);
		484	pthread_mutex_unlock (&reqlock);
		485
		486	if (nreqs > max_outstanding)
		487	for (;;)
		488	{
		489	poll_cb ();
		490
		491	if (nreqs <= max_outstanding)
		492	break;
		493
		494	poll_wait ();
		495	}
		496	}
		497
		498	static void end_thread (void)
257	{	499	{
258	aio_req req;	500	aio_req req;
		501	Newz (0, req, 1, aio_cb);
		502	req->type = REQ_QUIT;
259		503
260	/* then loop */	504	req_send (req);
261	while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))	505	}
		506
		507	static void min_parallel (int nthreads)
		508	{
		509	if (wanted < nthreads)
		510	wanted = nthreads;
		511	}
		512
		513	static void max_parallel (int nthreads)
		514	{
		515	int cur = started;
		516
		517	if (wanted > nthreads)
		518	wanted = nthreads;
		519
		520	while (cur > wanted)
		521	{
		522	end_thread ();
		523	cur--;
262	{	524	}
		525
		526	while (started > wanted)
		527	{
		528	poll_wait ();
		529	poll_cb ();
		530	}
		531	}
		532
		533	static void create_pipe ()
		534	{
		535	if (pipe (respipe))
		536	croak ("unable to initialize result pipe");
		537
		538	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
		539	croak ("cannot set result pipe to nonblocking mode");
		540
		541	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		542	croak ("cannot set result pipe to nonblocking mode");
		543	}
		544
		545	/*****************************************************************************/
		546	/* work around various missing functions */
		547
		548	#if !HAVE_PREADWRITE
		549	# define pread aio_pread
		550	# define pwrite aio_pwrite
		551
		552	/*
		553	* make our pread/pwrite safe against themselves, but not against
		554	* normal read/write by using a mutex. slows down execution a lot,
		555	* but that's your problem, not mine.
		556	*/
		557	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
		558
		559	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		560	{
		561	ssize_t res;
		562	off_t ooffset;
		563
		564	pthread_mutex_lock (&preadwritelock);
		565	ooffset = lseek (fd, 0, SEEK_CUR);
		566	lseek (fd, offset, SEEK_SET);
		567	res = read (fd, buf, count);
		568	lseek (fd, ooffset, SEEK_SET);
		569	pthread_mutex_unlock (&preadwritelock);
		570
		571	return res;
		572	}
		573
		574	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		575	{
		576	ssize_t res;
		577	off_t ooffset;
		578
		579	pthread_mutex_lock (&preadwritelock);
		580	ooffset = lseek (fd, 0, SEEK_CUR);
		581	lseek (fd, offset, SEEK_SET);
		582	res = write (fd, buf, count);
		583	lseek (fd, offset, SEEK_SET);
		584	pthread_mutex_unlock (&preadwritelock);
		585
		586	return res;
		587	}
		588	#endif
		589
		590	#if !HAVE_FDATASYNC
		591	# define fdatasync fsync
		592	#endif
		593
		594	#if !HAVE_READAHEAD
		595	# define readahead aio_readahead
		596
		597	static ssize_t readahead (int fd, off_t offset, size_t count)
		598	{
		599	char readahead_buf[4096];
		600
		601	while (count > 0)
		602	{
		603	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);
		604
		605	pread (fd, readahead_buf, len, offset);
		606	offset += len;
		607	count -= len;
		608	}
		609
		610	errno = 0;
		611	}
		612	#endif
		613
		614	#if !HAVE_READDIR_R
		615	# define readdir_r aio_readdir_r
		616
		617	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		618
		619	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		620	{
		621	struct dirent *e;
		622	int errorno;
		623
		624	pthread_mutex_lock (&readdirlock);
		625
		626	e = readdir (dirp);
		627	errorno = errno;
		628
		629	if (e)
		630	{
		631	*res = ent;
		632	strcpy (ent->d_name, e->d_name);
		633	}
		634	else
		635	*res = 0;
		636
		637	pthread_mutex_unlock (&readdirlock);
		638
		639	errno = errorno;
		640	return e ? 0 : -1;
		641	}
		642	#endif
		643
		644	/* sendfile always needs emulation */
		645	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count)
		646	{
		647	ssize_t res;
		648
		649	if (!count)
		650	return 0;
		651
		652	#if HAVE_SENDFILE
		653	# if __linux
		654	res = sendfile (ofd, ifd, &offset, count);
		655
		656	# elif __freebsd
		657	/*
		658	* Of course, the freebsd sendfile is a dire hack with no thoughts
		659	* wasted on making it similar to other I/O functions.
		660	*/
		661	{
		662	off_t sbytes;
		663	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		664
		665	if (res < 0 && sbytes)
		666	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
		667	res = sbytes;
		668	}
		669
		670	# elif __hpux
		671	res = sendfile (ofd, ifd, offset, count, 0, 0);
		672
		673	# elif __solaris
		674	{
		675	struct sendfilevec vec;
		676	size_t sbytes;
		677
		678	vec.sfv_fd = ifd;
		679	vec.sfv_flag = 0;
		680	vec.sfv_off = offset;
		681	vec.sfv_len = count;
		682
		683	res = sendfilev (ofd, &vec, 1, &sbytes);
		684
		685	if (res < 0 && sbytes)
		686	res = sbytes;
		687	}
		688
		689	# endif
		690	#else
		691	res = -1;
		692	errno = ENOSYS;
		693	#endif
		694
		695	if (res < 0
		696	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		697	#if __solaris
		698	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		699	#endif
		700	)
		701	)
		702	{
		703	/* emulate sendfile. this is a major pain in the ass */
		704	char buf[4096];
		705	res = 0;
		706
		707	while (count)
		708	{
		709	ssize_t cnt;
		710
		711	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);
		712
		713	if (cnt <= 0)
		714	{
		715	if (cnt && !res) res = -1;
		716	break;
		717	}
		718
		719	cnt = write (ofd, buf, cnt);
		720
		721	if (cnt <= 0)
		722	{
		723	if (cnt && !res) res = -1;
		724	break;
		725	}
		726
		727	offset += cnt;
		728	res += cnt;
		729	count -= cnt;
		730	}
		731	}
		732
		733	return res;
		734	}
		735
		736	/* read a full directory */
		737	static int scandir_ (const char *path, void **namesp)
		738	{
		739	DIR *dirp = opendir (path);
		740	union
		741	{
		742	struct dirent d;
		743	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		744	} u;
		745	struct dirent *entp;
		746	char *name, *names;
		747	int memlen = 4096;
		748	int memofs = 0;
		749	int res = 0;
		750	int errorno;
		751
		752	if (!dirp)
		753	return -1;
		754
		755	names = malloc (memlen);
		756
		757	for (;;)
		758	{
		759	errno = 0, readdir_r (dirp, &u.d, &entp);
		760
		761	if (!entp)
		762	break;
		763
		764	name = entp->d_name;
		765
		766	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		767	{
		768	int len = strlen (name) + 1;
		769
		770	res++;
		771
		772	while (memofs + len > memlen)
		773	{
		774	memlen *= 2;
		775	names = realloc (names, memlen);
		776	if (!names)
		777	break;
		778	}
		779
		780	memcpy (names + memofs, name, len);
		781	memofs += len;
		782	}
		783	}
		784
		785	errorno = errno;
		786	closedir (dirp);
		787
		788	if (errorno)
		789	{
		790	free (names);
		791	errno = errorno;
		792	res = -1;
		793	}
		794
		795	*namesp = (void *)names;
		796	return res;
		797	}
		798
		799	/*****************************************************************************/
		800
		801	static void *aio_proc (void *thr_arg)
		802	{
		803	aio_req req;
		804	int type;
		805
		806	do
		807	{
		808	pthread_mutex_lock (&reqlock);
		809
		810	for (;;)
		811	{
		812	req = reqs;
		813
		814	if (reqs)
		815	{
		816	reqs = reqs->next;
		817	if (!reqs) reqe = 0;
		818	}
		819
		820	if (req)
		821	break;
		822
		823	pthread_cond_wait (&reqwait, &reqlock);
		824	}
		825
		826	pthread_mutex_unlock (&reqlock);
		827
263	errno = 0; /* strictly unnecessary */	828	errno = 0; /* strictly unnecessary */
		829	type = req->type; /* remember type for QUIT check */
264		830
		831	if (!(req->flags & FLAG_CANCELLED))
265	switch (req->type)	832	switch (type)
		833	{
		834	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
		835	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
		836
		837	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
		838	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
		839
		840	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
		841	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
		842	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
		843
		844	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
		845	case REQ_CLOSE: req->result = close (req->fd); break;
		846	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
		847	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		848	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		849	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
		850	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
		851
		852	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
		853	case REQ_FSYNC: req->result = fsync (req->fd); break;
		854	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
		855
		856	case REQ_SLEEP:
		857	{
		858	struct timeval tv;
		859
		860	tv.tv_sec = req->fd;
		861	tv.tv_usec = req->fd2;
		862
		863	req->result = select (0, 0, 0, 0, &tv);
		864	}
		865
		866	case REQ_GROUP:
		867	case REQ_NOP:
		868	case REQ_QUIT:
		869	break;
		870
		871	default:
		872	req->result = ENOSYS;
		873	break;
		874	}
		875
		876	req->errorno = errno;
		877
		878	pthread_mutex_lock (&reslock);
		879
		880	req->next = 0;
		881
		882	if (rese)
266	{	883	{
267	case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break;	884	rese->next = req;
268	case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break;	885	rese = req;
269	#if SYS_readahead
270	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
271	#else
272	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
273	#endif
274
275	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
276	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
277	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
278
279	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
280	case REQ_CLOSE: req->result = close (req->fd); break;
281	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
282
283	case REQ_FSYNC: req->result = fsync (req->fd); break;
284	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
285
286	case REQ_QUIT:
287	write (respipe[1], (void *)&req, sizeof (req));
288	return 0;
289
290	default:
291	req->result = ENOSYS;
292	break;
293	}	886	}
		887	else
		888	{
		889	rese = ress = req;
294		890
295	req->errorno = errno;	891	/* write a dummy byte to the pipe so fh becomes ready */
296	write (respipe[1], (void *)&req, sizeof (req));	892	write (respipe [1], &respipe, 1);
		893	}
		894
		895	pthread_mutex_unlock (&reslock);
297	}	896	}
		897	while (type != REQ_QUIT);
298		898
299	return 0;	899	return 0;
300	}	900	}
301		901
		902	/*****************************************************************************/
		903
		904	static void atfork_prepare (void)
		905	{
		906	pthread_mutex_lock (&reqlock);
		907	pthread_mutex_lock (&reslock);
		908	#if !HAVE_PREADWRITE
		909	pthread_mutex_lock (&preadwritelock);
		910	#endif
		911	#if !HAVE_READDIR_R
		912	pthread_mutex_lock (&readdirlock);
		913	#endif
		914	}
		915
		916	static void atfork_parent (void)
		917	{
		918	#if !HAVE_READDIR_R
		919	pthread_mutex_unlock (&readdirlock);
		920	#endif
		921	#if !HAVE_PREADWRITE
		922	pthread_mutex_unlock (&preadwritelock);
		923	#endif
		924	pthread_mutex_unlock (&reslock);
		925	pthread_mutex_unlock (&reqlock);
		926	}
		927
		928	static void atfork_child (void)
		929	{
		930	aio_req prv;
		931
		932	started = 0;
		933
		934	while (reqs)
		935	{
		936	prv = reqs;
		937	reqs = prv->next;
		938	req_free (prv);
		939	}
		940
		941	reqs = reqe = 0;
		942
		943	while (ress)
		944	{
		945	prv = ress;
		946	ress = prv->next;
		947	req_free (prv);
		948	}
		949
		950	ress = rese = 0;
		951
		952	close (respipe [0]);
		953	close (respipe [1]);
		954	create_pipe ();
		955
		956	atfork_parent ();
		957	}
		958
		959	#define dREQ \
		960	aio_req req; \
		961	int req_pri = next_pri; \
		962	next_pri = DEFAULT_PRI + PRI_BIAS; \
		963	\
		964	if (SvOK (callback) && !SvROK (callback)) \
		965	croak ("callback must be undef or of reference type"); \
		966	\
		967	Newz (0, req, 1, aio_cb); \
		968	if (!req) \
		969	croak ("out of memory during aio_req allocation"); \
		970	\
		971	req->callback = newSVsv (callback); \
		972	req->pri = req_pri
		973
		974	#define REQ_SEND \
		975	req_send (req); \
		976	\
		977	if (GIMME_V != G_VOID) \
		978	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		979
302	MODULE = IO::AIO PACKAGE = IO::AIO	980	MODULE = IO::AIO PACKAGE = IO::AIO
303		981
		982	PROTOTYPES: ENABLE
		983
304	BOOT:	984	BOOT:
305	{	985	{
306	if (pipe (reqpipe) || pipe (respipe))	986	HV *stash = gv_stashpv ("IO::AIO", 1);
307	croak ("unable to initialize request or result pipe");	987	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		988	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		989	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
308		990
309	if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK))	991	create_pipe ();
310	croak ("cannot set result pipe to nonblocking mode");	992	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
311
312	if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
313	croak ("cannot set result pipe to nonblocking mode");
314	}	993	}
315		994
316	void	995	void
317	min_parallel(nthreads)	996	min_parallel (nthreads)
318	int nthreads	997	int nthreads
319	PROTOTYPE: $	998	PROTOTYPE: $
320	CODE:
321	while (nthreads > started)
322	start_thread ();
323		999
324	void	1000	void
325	max_parallel(nthreads)	1001	max_parallel (nthreads)
326	int nthreads	1002	int nthreads
327	PROTOTYPE: $	1003	PROTOTYPE: $
		1004
		1005	int
		1006	max_outstanding (nreqs)
		1007	int nreqs
		1008	PROTOTYPE: $
328	CODE:	1009	CODE:
329	{	1010	RETVAL = max_outstanding;
330	int cur = started;	1011	max_outstanding = nreqs;
331	while (cur > nthreads)
332	{
333	end_thread ();
334	cur--;
335	}
336		1012
337	while (started > nthreads)
338	{
339	poll_wait ();
340	poll_cb (aTHX);
341	}
342	}
343
344	void	1013	void
345	aio_open(pathname,flags,mode,callback)	1014	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
346	SV * pathname	1015	SV * pathname
347	int flags	1016	int flags
348	int mode	1017	int mode
349	SV * callback	1018	SV * callback
350	PROTOTYPE: $$$$	1019	PROTOTYPE: $$$;$
351	CODE:	1020	PPCODE:
352	{	1021	{
353	aio_req req;	1022	dREQ;
354
355	Newz (0, req, 1, aio_cb);
356
357	if (!req)
358	croak ("out of memory during aio_req allocation");
359		1023
360	req->type = REQ_OPEN;	1024	req->type = REQ_OPEN;
361	req->data = newSVsv (pathname);	1025	req->data = newSVsv (pathname);
362	req->dataptr = SvPV_nolen (req->data);	1026	req->dataptr = SvPVbyte_nolen (req->data);
363	req->fd = flags;	1027	req->fd = flags;
364	req->mode = mode;	1028	req->mode = mode;
365	req->callback = SvREFCNT_inc (callback);
366		1029
367	send_req (req);	1030	REQ_SEND;
368	}	1031	}
369		1032
370	void	1033	void
371	aio_close(fh,callback)	1034	aio_close (fh,callback=&PL_sv_undef)
372	InputStream fh	1035	SV * fh
373	SV * callback	1036	SV * callback
374	PROTOTYPE: $$	1037	PROTOTYPE: $;$
375	ALIAS:	1038	ALIAS:
376	aio_close = REQ_CLOSE	1039	aio_close = REQ_CLOSE
377	aio_fsync = REQ_FSYNC	1040	aio_fsync = REQ_FSYNC
378	aio_fdatasync = REQ_FDATASYNC	1041	aio_fdatasync = REQ_FDATASYNC
379	CODE:	1042	PPCODE:
		1043	{
		1044	dREQ;
		1045
		1046	req->type = ix;
		1047	req->fh = newSVsv (fh);
		1048	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
		1049
		1050	REQ_SEND (req);
		1051	}
		1052
		1053	void
		1054	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
		1055	SV * fh
		1056	UV offset
		1057	UV length
		1058	SV * data
		1059	UV dataoffset
		1060	SV * callback
		1061	ALIAS:
		1062	aio_read = REQ_READ
		1063	aio_write = REQ_WRITE
		1064	PROTOTYPE: $$$$$;$
		1065	PPCODE:
380	{	1066	{
381	aio_req req;	1067	aio_req req;
		1068	STRLEN svlen;
		1069	char *svptr = SvPVbyte (data, svlen);
382		1070
383	Newz (0, req, 1, aio_cb);	1071	SvUPGRADE (data, SVt_PV);
		1072	SvPOK_on (data);
384		1073
385	if (!req)	1074	if (dataoffset < 0)
386	croak ("out of memory during aio_req allocation");	1075	dataoffset += svlen;
387		1076
388	req->type = ix;	1077	if (dataoffset < 0 || dataoffset > svlen)
389	req->fd = PerlIO_fileno (fh);	1078	croak ("data offset outside of string");
390	req->callback = SvREFCNT_inc (callback);
391		1079
392	send_req (req);	1080	if (ix == REQ_WRITE)
393	}	1081	{
394		1082	/* write: check length and adjust. */
395	void	1083	if (length < 0 || length + dataoffset > svlen)
396	aio_read(fh,offset,length,data,dataoffset,callback)	1084	length = svlen - dataoffset;
397	InputStream fh	1085	}
398	UV offset	1086	else
399	IV length	1087	{
400	SV * data	1088	/* read: grow scalar as necessary */
401	IV dataoffset	1089	svptr = SvGROW (data, length + dataoffset);
402	SV * callback	1090	}
403	PROTOTYPE: $$$$$$
404	CODE:
405	read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
406
407	void
408	aio_write(fh,offset,length,data,dataoffset,callback)
409	OutputStream fh
410	UV offset
411	IV length
412	SV * data
413	IV dataoffset
414	SV * callback
415	PROTOTYPE: $$$$$$
416	CODE:
417	read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
418
419	void
420	aio_readahead(fh,offset,length,callback)
421	InputStream fh
422	UV offset
423	IV length
424	SV * callback
425	PROTOTYPE: $$$$
426	CODE:
427	{
428	aio_req req;
429		1091
430	if (length < 0)	1092	if (length < 0)
431	croak ("length must not be negative");	1093	croak ("length must not be negative");
432		1094
433	Newz (0, req, 1, aio_cb);	1095	{
		1096	dREQ;
434		1097
435	if (!req)	1098	req->type = ix;
436	croak ("out of memory during aio_req allocation");	1099	req->fh = newSVsv (fh);
		1100	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
		1101	: IoOFP (sv_2io (fh)));
		1102	req->offset = offset;
		1103	req->length = length;
		1104	req->data = SvREFCNT_inc (data);
		1105	req->dataptr = (char *)svptr + dataoffset;
		1106
		1107	if (!SvREADONLY (data))
		1108	{
		1109	SvREADONLY_on (data);
		1110	req->data2ptr = (void *)data;
		1111	}
		1112
		1113	REQ_SEND;
		1114	}
		1115	}
		1116
		1117	void
		1118	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1119	SV * out_fh
		1120	SV * in_fh
		1121	UV in_offset
		1122	UV length
		1123	SV * callback
		1124	PROTOTYPE: $$$$;$
		1125	PPCODE:
		1126	{
		1127	dREQ;
		1128
		1129	req->type = REQ_SENDFILE;
		1130	req->fh = newSVsv (out_fh);
		1131	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1132	req->fh2 = newSVsv (in_fh);
		1133	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1134	req->offset = in_offset;
		1135	req->length = length;
		1136
		1137	REQ_SEND;
		1138	}
		1139
		1140	void
		1141	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
		1142	SV * fh
		1143	UV offset
		1144	IV length
		1145	SV * callback
		1146	PROTOTYPE: $$$;$
		1147	PPCODE:
		1148	{
		1149	dREQ;
437		1150
438	req->type = REQ_READAHEAD;	1151	req->type = REQ_READAHEAD;
		1152	req->fh = newSVsv (fh);
439	req->fd = PerlIO_fileno (fh);	1153	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
440	req->offset = offset;	1154	req->offset = offset;
441	req->length = length;	1155	req->length = length;
442	req->callback = SvREFCNT_inc (callback);
443		1156
444	send_req (req);	1157	REQ_SEND;
445	}	1158	}
446		1159
447	void	1160	void
448	aio_stat(fh_or_path,callback)	1161	aio_stat (fh_or_path,callback=&PL_sv_undef)
449	SV * fh_or_path	1162	SV * fh_or_path
450	SV * callback	1163	SV * callback
451	PROTOTYPE: $$
452	ALIAS:	1164	ALIAS:
		1165	aio_stat = REQ_STAT
453	aio_lstat = 1	1166	aio_lstat = REQ_LSTAT
454	CODE:	1167	PPCODE:
455	{	1168	{
456	aio_req req;	1169	dREQ;
457
458	Newz (0, req, 1, aio_cb);
459
460	if (!req)
461	croak ("out of memory during aio_req allocation");
462		1170
463	New (0, req->statdata, 1, Stat_t);	1171	New (0, req->statdata, 1, Stat_t);
464
465	if (!req->statdata)	1172	if (!req->statdata)
		1173	{
		1174	req_free (req);
466	croak ("out of memory during aio_req->statdata allocation");	1175	croak ("out of memory during aio_req->statdata allocation");
		1176	}
467		1177
468	if (SvPOK (fh_or_path))	1178	if (SvPOK (fh_or_path))
469	{	1179	{
470	req->type = ix ? REQ_LSTAT : REQ_STAT;	1180	req->type = ix;
471	req->data = newSVsv (fh_or_path);	1181	req->data = newSVsv (fh_or_path);
472	req->dataptr = SvPV_nolen (req->data);	1182	req->dataptr = SvPVbyte_nolen (req->data);
473	}	1183	}
474	else	1184	else
475	{	1185	{
476	req->type = REQ_FSTAT;	1186	req->type = REQ_FSTAT;
		1187	req->fh = newSVsv (fh_or_path);
477	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1188	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
478	}	1189	}
479		1190
480	req->callback = SvREFCNT_inc (callback);	1191	REQ_SEND;
481
482	send_req (req);
483	}	1192	}
484		1193
485	void	1194	void
486	aio_unlink(pathname,callback)	1195	aio_unlink (pathname,callback=&PL_sv_undef)
487	SV * pathname	1196	SV * pathname
488	SV * callback	1197	SV * callback
		1198	ALIAS:
		1199	aio_unlink = REQ_UNLINK
		1200	aio_rmdir = REQ_RMDIR
		1201	aio_readdir = REQ_READDIR
		1202	PPCODE:
		1203	{
		1204	dREQ;
		1205
		1206	req->type = ix;
		1207	req->data = newSVsv (pathname);
		1208	req->dataptr = SvPVbyte_nolen (req->data);
		1209
		1210	REQ_SEND;
		1211	}
		1212
		1213	void
		1214	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1215	SV * oldpath
		1216	SV * newpath
		1217	SV * callback
		1218	ALIAS:
		1219	aio_link = REQ_LINK
		1220	aio_symlink = REQ_SYMLINK
		1221	aio_rename = REQ_RENAME
		1222	PPCODE:
		1223	{
		1224	dREQ;
		1225
		1226	req->type = ix;
		1227	req->fh = newSVsv (oldpath);
		1228	req->data2ptr = SvPVbyte_nolen (req->fh);
		1229	req->data = newSVsv (newpath);
		1230	req->dataptr = SvPVbyte_nolen (req->data);
		1231
		1232	REQ_SEND;
		1233	}
		1234
		1235	void
		1236	aio_sleep (delay,callback=&PL_sv_undef)
		1237	double delay
		1238	SV * callback
		1239	PPCODE:
		1240	{
		1241	dREQ;
		1242
		1243	req->type = REQ_SLEEP;
		1244	req->fd = delay < 0. ? 0 : delay;
		1245	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1246
		1247	REQ_SEND;
		1248	}
		1249
		1250	void
		1251	aio_group (callback=&PL_sv_undef)
		1252	SV * callback
489	PROTOTYPE: $$	1253	PROTOTYPE: ;$
		1254	PPCODE:
		1255	{
		1256	dREQ;
		1257
		1258	req->type = REQ_GROUP;
		1259	req_send (req);
		1260
		1261	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1262	}
		1263
		1264	void
		1265	aio_nop (callback=&PL_sv_undef)
		1266	SV * callback
		1267	PPCODE:
		1268	{
		1269	dREQ;
		1270
		1271	req->type = REQ_NOP;
		1272
		1273	REQ_SEND;
		1274	}
		1275
		1276	#if 0
		1277
		1278	void
		1279	aio_pri (int pri = DEFAULT_PRI)
490	CODE:	1280	CODE:
491	{	1281	if (pri < PRI_MIN) pri = PRI_MIN;
492	aio_req req;	1282	if (pri > PRI_MAX) pri = PRI_MAX;
493		1283	next_pri = pri + PRI_BIAS;
494	Newz (0, req, 1, aio_cb);	1284
495		1285	#endif
496	if (!req)	1286
497	croak ("out of memory during aio_req allocation");	1287	void
498		1288	flush ()
499	req->type = REQ_UNLINK;	1289	PROTOTYPE:
500	req->data = newSVsv (pathname);	1290	CODE:
501	req->dataptr = SvPV_nolen (req->data);	1291	while (nreqs)
502	req->callback = SvREFCNT_inc (callback);	1292	{
503		1293	poll_wait ();
504	send_req (req);	1294	poll_cb ();
505	}	1295	}
		1296
		1297	void
		1298	poll()
		1299	PROTOTYPE:
		1300	CODE:
		1301	if (nreqs)
		1302	{
		1303	poll_wait ();
		1304	poll_cb ();
		1305	}
506		1306
507	int	1307	int
508	poll_fileno()	1308	poll_fileno()
509	PROTOTYPE:	1309	PROTOTYPE:
510	CODE:	1310	CODE:
511	RETVAL = respipe[0];	1311	RETVAL = respipe [0];
512	OUTPUT:	1312	OUTPUT:
513	RETVAL	1313	RETVAL
514		1314
515	int	1315	int
516	poll_cb(...)	1316	poll_cb(...)
517	PROTOTYPE:	1317	PROTOTYPE:
518	CODE:	1318	CODE:
519	RETVAL = poll_cb (aTHX);	1319	RETVAL = poll_cb ();
520	OUTPUT:	1320	OUTPUT:
521	RETVAL	1321	RETVAL
522		1322
523	void	1323	void
524	poll_wait()	1324	poll_wait()
525	PROTOTYPE:	1325	PROTOTYPE:
526	CODE:	1326	CODE:
		1327	if (nreqs)
527	poll_wait ();	1328	poll_wait ();
528		1329
529	int	1330	int
530	nreqs()	1331	nreqs()
531	PROTOTYPE:	1332	PROTOTYPE:
532	CODE:	1333	CODE:
533	RETVAL = nreqs;	1334	RETVAL = nreqs;
534	OUTPUT:	1335	OUTPUT:
535	RETVAL	1336	RETVAL
536		1337
		1338	PROTOTYPES: DISABLE
		1339
		1340	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1341
		1342	void
		1343	cancel (aio_req_ornot req)
		1344	PROTOTYPE:
		1345	CODE:
		1346	req_cancel (req);
		1347
		1348	void
		1349	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1350	CODE:
		1351	SvREFCNT_dec (req->callback);
		1352	req->callback = newSVsv (callback);
		1353
		1354	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1355
		1356	void
		1357	add (aio_req grp, ...)
		1358	PPCODE:
		1359	{
		1360	int i;
		1361	aio_req req;
		1362
		1363	if (grp->fd == 2)
		1364	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1365
		1366	for (i = 1; i < items; ++i )
		1367	{
		1368	if (GIMME_V != G_VOID)
		1369	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1370
		1371	req = SvAIO_REQ (ST (i));
		1372
		1373	if (req)
		1374	{
		1375	++grp->length;
		1376	req->grp = grp;
		1377
		1378	req->grp_prev = 0;
		1379	req->grp_next = grp->grp_first;
		1380
		1381	if (grp->grp_first)
		1382	grp->grp_first->grp_prev = req;
		1383
		1384	grp->grp_first = req;
		1385	}
		1386	}
		1387	}
		1388
		1389	void
		1390	result (aio_req grp, ...)
		1391	CODE:
		1392	{
		1393	int i;
		1394	AV *av = newAV ();
		1395
		1396	for (i = 1; i < items; ++i )
		1397	av_push (av, newSVsv (ST (i)));
		1398
		1399	SvREFCNT_dec (grp->data);
		1400	grp->data = (SV *)av;
		1401	}
		1402
		1403	void
		1404	feed_limit (aio_req grp, int limit)
		1405	CODE:
		1406	grp->fd2 = limit;
		1407	aio_grp_feed (grp);
		1408
		1409	void
		1410	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1411	CODE:
		1412	{
		1413	SvREFCNT_dec (grp->fh2);
		1414	grp->fh2 = newSVsv (callback);
		1415
		1416	if (grp->fd2 <= 0)
		1417	grp->fd2 = 2;
		1418
		1419	aio_grp_feed (grp);
		1420	}
		1421

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