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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.10 by root, Wed Jul 13 00:13:09 2005 UTC vs.
Revision 1.71 by root, Tue Oct 24 16:35:04 2006 UTC

		1	/* solaris */
		2	#define _POSIX_PTHREAD_SEMANTICS 1
		3
		4	#if __linux
		5	# define _GNU_SOURCE
		6	#endif
		7
		8	#define _REENTRANT 1
		9
		10	#include <errno.h>
		11
1	#include "EXTERN.h"	12	#include "EXTERN.h"
2	#include "perl.h"	13	#include "perl.h"
3	#include "XSUB.h"	14	#include "XSUB.h"
4		15
5	#define _XOPEN_SOURCE 500	16	#include "autoconf/config.h"
6		17
		18	#include <pthread.h>
		19
		20	#include <stddef.h>
		21	#include <errno.h>
		22	#include <sys/time.h>
		23	#include <sys/select.h>
7	#include <sys/types.h>	24	#include <sys/types.h>
8	#include <sys/stat.h>	25	#include <sys/stat.h>
9		26	#include <limits.h>
10	#include <unistd.h>	27	#include <unistd.h>
11	#include <fcntl.h>	28	#include <fcntl.h>
12	#include <signal.h>	29	#include <signal.h>
13	#include <sched.h>	30	#include <sched.h>
		31
		32	#if HAVE_SENDFILE
14	#if __linux	33	# if __linux
		34	# include <sys/sendfile.h>
		35	# elif __freebsd
15	#include <sys/syscall.h>	36	# include <sys/socket.h>
		37	# include <sys/uio.h>
		38	# elif __hpux
		39	# include <sys/socket.h>
		40	# elif __solaris /* not yet */
		41	# include <sys/sendfile.h>
		42	# else
		43	# error sendfile support requested but not available
16	#endif	44	# endif
		45	#endif
17		46
18	#include <pthread.h>	47	/* used for struct dirent, AIX doesn't provide it */
19		48	#ifndef NAME_MAX
20	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	49	# define NAME_MAX 4096
21	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	50	#endif
22	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
23		51
24	#if __ia64	52	#if __ia64
25	# define STACKSIZE 65536	53	# define STACKSIZE 65536
		54	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		55	# define STACKSIZE PTHREAD_STACK_MIN
26	#else	56	#else
27	# define STACKSIZE 4096	57	# define STACKSIZE 16384
28	#endif	58	#endif
		59
		60	/* buffer size for various temporary buffers */
		61	#define AIO_BUFSIZE 65536
		62
		63	#define dBUF \
		64	char *aio_buf; \
		65	LOCK (wrklock); \
		66	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		67	UNLOCK (wrklock); \
		68	if (!aio_buf) \
		69	return -1;
29		70
30	enum {	71	enum {
31	REQ_QUIT,	72	REQ_QUIT,
32	REQ_OPEN, REQ_CLOSE,	73	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,	74	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		75	REQ_SENDFILE,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	76	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35	REQ_FSYNC, REQ_FDATASYNC,	77	REQ_FSYNC, REQ_FDATASYNC,
		78	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
		79	REQ_READDIR,
		80	REQ_LINK, REQ_SYMLINK,
		81	REQ_GROUP, REQ_NOP,
		82	REQ_BUSY,
36	};	83	};
37		84
		85	#define AIO_REQ_KLASS "IO::AIO::REQ"
		86	#define AIO_GRP_KLASS "IO::AIO::GRP"
		87
38	typedef struct aio_cb {	88	typedef struct aio_cb
		89	{
39	struct aio_cb *volatile next;	90	struct aio_cb *volatile next;
40		91
41	int type;	92	SV *data, *callback;
42		93	SV *fh, *fh2;
43	int fd;	94	void *dataptr, *data2ptr;
		95	Stat_t *statdata;
44	off_t offset;	96	off_t offset;
45	size_t length;	97	size_t length;
46	ssize_t result;	98	ssize_t result;
		99
		100	STRLEN dataoffset;
		101	int type;
		102	int fd, fd2;
		103	int errorno;
47	mode_t mode; /* open */	104	mode_t mode; /* open */
48	int errorno;
49	SV *data, *callback;
50	void *dataptr;
51	STRLEN dataoffset;
52		105
53	Stat_t *statdata;	106	unsigned char flags;
		107	unsigned char pri;
		108
		109	SV *self; /* the perl counterpart of this request, if any */
		110	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
54	} aio_cb;	111	} aio_cb;
55		112
		113	enum {
		114	FLAG_CANCELLED = 0x01,
		115	};
		116
56	typedef aio_cb *aio_req;	117	typedef aio_cb *aio_req;
		118	typedef aio_cb *aio_req_ornot;
57		119
		120	enum {
		121	PRI_MIN = -4,
		122	PRI_MAX = 4,
		123
		124	DEFAULT_PRI = 0,
		125	PRI_BIAS = -PRI_MIN,
		126	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		127	};
		128
		129	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		130
58	static int started;	131	static int started, wanted;
59	static int nreqs;	132	static volatile int nreqs;
60	static int max_outstanding = 1<<30;	133	static int max_outstanding = 1<<30;
61	static int respipe [2];	134	static int respipe [2];
62		135
		136	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		137	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		138	#else
		139	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
		140	#endif
		141
		142	#define LOCK(mutex) pthread_mutex_lock (&(mutex))
		143	#define UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
		144
		145	/* worker threasd management */
		146	static pthread_mutex_t wrklock = AIO_MUTEX_INIT;
		147
		148	typedef struct worker {
		149	/* locked by wrklock */
		150	struct worker *prev, *next;
		151
		152	pthread_t tid;
		153
		154	/* locked by reslock, reqlock or wrklock */
		155	aio_req req; /* currently processed request */
		156	void *dbuf;
		157	DIR *dirp;
		158	} worker;
		159
		160	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		161
		162	static void worker_clear (worker *wrk)
		163	{
		164	if (wrk->dirp)
		165	{
		166	closedir (wrk->dirp);
		167	wrk->dirp = 0;
		168	}
		169
		170	if (wrk->dbuf)
		171	{
		172	free (wrk->dbuf);
		173	wrk->dbuf = 0;
		174	}
		175	}
		176
		177	static void worker_free (worker *wrk)
		178	{
		179	wrk->next->prev = wrk->prev;
		180	wrk->prev->next = wrk->next;
		181
		182	free (wrk);
		183	}
		184
63	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	185	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
64	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	186	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
65	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	187	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
66		188
67	static volatile aio_req reqs, reqe; /* queue start, queue end */	189	/*
68	static volatile aio_req ress, rese; /* queue start, queue end */	190	* a somewhat faster data structure might be nice, but
		191	* with 8 priorities this actually needs <20 insns
		192	* per shift, the most expensive operation.
		193	*/
		194	typedef struct {
		195	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		196	int size;
		197	} reqq;
69		198
70	static void	199	static reqq req_queue;
71	poll_wait ()	200	static reqq res_queue;
		201
		202	int reqq_push (reqq *q, aio_req req)
72	{	203	{
73	if (!nreqs)	204	int pri = req->pri;
		205	req->next = 0;
		206
		207	if (q->qe[pri])
		208	{
		209	q->qe[pri]->next = req;
		210	q->qe[pri] = req;
		211	}
		212	else
		213	q->qe[pri] = q->qs[pri] = req;
		214
		215	return q->size++;
		216	}
		217
		218	aio_req reqq_shift (reqq *q)
		219	{
		220	int pri;
		221
		222	if (!q->size)
74	return;	223	return 0;
75		224
		225	--q->size;
		226
		227	for (pri = NUM_PRI; pri--; )
		228	{
		229	aio_req req = q->qs[pri];
		230
		231	if (req)
		232	{
		233	if (!(q->qs[pri] = req->next))
		234	q->qe[pri] = 0;
		235
		236	return req;
		237	}
		238	}
		239
		240	abort ();
		241	}
		242
		243	static void req_invoke (aio_req req);
		244	static void req_free (aio_req req);
		245
		246	/* must be called at most once */
		247	static SV *req_sv (aio_req req, const char *klass)
		248	{
		249	if (!req->self)
		250	{
		251	req->self = (SV *)newHV ();
		252	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		253	}
		254
		255	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		256	}
		257
		258	static aio_req SvAIO_REQ (SV *sv)
		259	{
		260	MAGIC *mg;
		261
		262	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		263	croak ("object of class " AIO_REQ_KLASS " expected");
		264
		265	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		266
		267	return mg ? (aio_req)mg->mg_ptr : 0;
		268	}
		269
		270	static void aio_grp_feed (aio_req grp)
		271	{
		272	while (grp->length < grp->fd2 && !(grp->flags & FLAG_CANCELLED))
		273	{
		274	int old_len = grp->length;
		275
		276	if (grp->fh2 && SvOK (grp->fh2))
		277	{
		278	dSP;
		279
		280	ENTER;
		281	SAVETMPS;
		282	PUSHMARK (SP);
		283	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		284	PUTBACK;
		285	call_sv (grp->fh2, G_VOID | G_EVAL | G_KEEPERR);
		286	SPAGAIN;
		287	FREETMPS;
		288	LEAVE;
		289	}
		290
		291	/* stop if no progress has been made */
		292	if (old_len == grp->length)
		293	{
		294	SvREFCNT_dec (grp->fh2);
		295	grp->fh2 = 0;
		296	break;
		297	}
		298	}
		299	}
		300
		301	static void aio_grp_dec (aio_req grp)
		302	{
		303	--grp->length;
		304
		305	/* call feeder, if applicable */
		306	aio_grp_feed (grp);
		307
		308	/* finish, if done */
		309	if (!grp->length && grp->fd)
		310	{
		311	req_invoke (grp);
		312	req_free (grp);
		313	}
		314	}
		315
		316	static void poll_wait ()
		317	{
76	fd_set rfd;	318	fd_set rfd;
		319
		320	while (nreqs)
		321	{
		322	int size;
		323	#if !(__i386 || __x86_64) /* safe without sempahore on these archs */
		324	LOCK (reslock);
		325	#endif
		326	size = res_queue.size;
		327	#if !(__i386 || __x86_64) /* safe without sempahore on these archs */
		328	UNLOCK (reslock);
		329	#endif
		330
		331	if (size)
		332	return;
		333
77	FD_ZERO(&rfd);	334	FD_ZERO(&rfd);
78	FD_SET(respipe [0], &rfd);	335	FD_SET(respipe [0], &rfd);
79		336
80	select (respipe [0] + 1, &rfd, 0, 0, 0);	337	select (respipe [0] + 1, &rfd, 0, 0, 0);
		338	}
81	}	339	}
82		340
83	static int	341	static void req_invoke (aio_req req)
84	poll_cb ()	342	{
		343	dSP;
		344
		345	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		346	{
		347	errno = req->errorno;
		348
		349	ENTER;
		350	SAVETMPS;
		351	PUSHMARK (SP);
		352	EXTEND (SP, 1);
		353
		354	switch (req->type)
		355	{
		356	case REQ_READDIR:
		357	{
		358	SV *rv = &PL_sv_undef;
		359
		360	if (req->result >= 0)
		361	{
		362	int i;
		363	char *buf = req->data2ptr;
		364	AV *av = newAV ();
		365
		366	av_extend (av, req->result - 1);
		367
		368	for (i = 0; i < req->result; ++i)
		369	{
		370	SV *sv = newSVpv (buf, 0);
		371
		372	av_store (av, i, sv);
		373	buf += SvCUR (sv) + 1;
		374	}
		375
		376	rv = sv_2mortal (newRV_noinc ((SV *)av));
		377	}
		378
		379	PUSHs (rv);
		380	}
		381	break;
		382
		383	case REQ_OPEN:
		384	{
		385	/* convert fd to fh */
		386	SV *fh;
		387
		388	PUSHs (sv_2mortal (newSViv (req->result)));
		389	PUTBACK;
		390	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		391	SPAGAIN;
		392
		393	fh = SvREFCNT_inc (POPs);
		394
		395	PUSHMARK (SP);
		396	XPUSHs (sv_2mortal (fh));
		397	}
		398	break;
		399
		400	case REQ_GROUP:
		401	req->fd = 2; /* mark group as finished */
		402
		403	if (req->data)
		404	{
		405	int i;
		406	AV *av = (AV *)req->data;
		407
		408	EXTEND (SP, AvFILL (av) + 1);
		409	for (i = 0; i <= AvFILL (av); ++i)
		410	PUSHs (*av_fetch (av, i, 0));
		411	}
		412	break;
		413
		414	case REQ_NOP:
		415	case REQ_BUSY:
		416	break;
		417
		418	default:
		419	PUSHs (sv_2mortal (newSViv (req->result)));
		420	break;
		421	}
		422
		423
		424	PUTBACK;
		425	call_sv (req->callback, G_VOID | G_EVAL);
		426	SPAGAIN;
		427
		428	FREETMPS;
		429	LEAVE;
		430	}
		431
		432	if (req->grp)
		433	{
		434	aio_req grp = req->grp;
		435
		436	/* unlink request */
		437	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		438	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		439
		440	if (grp->grp_first == req)
		441	grp->grp_first = req->grp_next;
		442
		443	aio_grp_dec (grp);
		444	}
		445
		446	if (SvTRUE (ERRSV))
		447	{
		448	req_free (req);
		449	croak (0);
		450	}
		451	}
		452
		453	static void req_free (aio_req req)
		454	{
		455	if (req->self)
		456	{
		457	sv_unmagic (req->self, PERL_MAGIC_ext);
		458	SvREFCNT_dec (req->self);
		459	}
		460
		461	SvREFCNT_dec (req->data);
		462	SvREFCNT_dec (req->fh);
		463	SvREFCNT_dec (req->fh2);
		464	SvREFCNT_dec (req->callback);
		465	Safefree (req->statdata);
		466
		467	if (req->type == REQ_READDIR)
		468	free (req->data2ptr);
		469
		470	Safefree (req);
		471	}
		472
		473	static void req_cancel (aio_req req)
		474	{
		475	req->flags |= FLAG_CANCELLED;
		476
		477	if (req->type == REQ_GROUP)
		478	{
		479	aio_req sub;
		480
		481	for (sub = req->grp_first; sub; sub = sub->grp_next)
		482	req_cancel (sub);
		483	}
		484	}
		485
		486	static int poll_cb ()
85	{	487	{
86	dSP;	488	dSP;
87	int count = 0;	489	int count = 0;
		490	int do_croak = 0;
88	aio_req req;	491	aio_req req;
89
90	{
91	/* read and signals sent by the worker threads */
92	char buf [32];
93	while (read (respipe [0], buf, 32) > 0)
94	;
95	}
96		492
97	for (;;)	493	for (;;)
98	{	494	{
99	pthread_mutex_lock (&reslock);	495	LOCK (reslock);
		496	req = reqq_shift (&res_queue);
100		497
101	req = ress;
102
103	if (ress)	498	if (req)
104	{	499	{
105	ress = ress->next;	500	if (!res_queue.size)
106	if (!ress) rese = 0;	501	{
		502	/* read any signals sent by the worker threads */
		503	char buf [32];
		504	while (read (respipe [0], buf, 32) == 32)
		505	;
		506	}
107	}	507	}
108		508
109	pthread_mutex_unlock (&reslock);	509	UNLOCK (reslock);
110		510
111	if (!req)	511	if (!req)
112	break;	512	break;
113		513
114	nreqs--;	514	--nreqs;
115		515
116	if (req->type == REQ_QUIT)	516	if (req->type == REQ_QUIT)
117	started--;	517	started--;
		518	else if (req->type == REQ_GROUP && req->length)
		519	{
		520	req->fd = 1; /* mark request as delayed */
		521	continue;
		522	}
118	else	523	else
119	{	524	{
120	int errorno = errno;
121	errno = req->errorno;
122
123	if (req->type == REQ_READ)	525	if (req->type == REQ_READ)
124	SvCUR_set (req->data, req->dataoffset	526	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
125	+ req->result > 0 ? req->result : 0);
126		527
		528	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		529	SvREADONLY_off (req->data);
		530
127	if (req->data)	531	if (req->statdata)
128	SvREFCNT_dec (req->data);
129
130	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
131	{	532	{
132	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	533	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
133	PL_laststatval = req->result;	534	PL_laststatval = req->result;
134	PL_statcache = *(req->statdata);	535	PL_statcache = *(req->statdata);
135
136	Safefree (req->statdata);
137	}	536	}
138		537
139	PUSHMARK (SP);	538	req_invoke (req);
140	XPUSHs (sv_2mortal (newSViv (req->result)));
141		539
142	if (req->type == REQ_OPEN)
143	{
144	/* convert fd to fh */
145	SV *fh;
146
147	PUTBACK;
148	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
149	SPAGAIN;
150
151	fh = POPs;
152
153	PUSHMARK (SP);
154	XPUSHs (fh);
155	}
156
157	if (SvOK (req->callback))
158	{
159	PUTBACK;
160	call_sv (req->callback, G_VOID | G_EVAL);
161	SPAGAIN;
162	}
163
164	if (req->callback)
165	SvREFCNT_dec (req->callback);
166
167	errno = errorno;
168	count++;	540	count++;
169	}	541	}
170		542
171	Safefree (req);	543	req_free (req);
172	}	544	}
173		545
174	return count;	546	return count;
175	}	547	}
176		548
177	static void *aio_proc(void *arg);	549	static void *aio_proc(void *arg);
178		550
179	static void
180	start_thread (void)	551	static void start_thread (void)
181	{	552	{
		553	worker *wrk = calloc (1, sizeof (worker));
		554
		555	if (!wrk)
		556	croak ("unable to allocate worker thread data");
		557
182	sigset_t fullsigset, oldsigset;	558	sigset_t fullsigset, oldsigset;
183	pthread_t tid;
184	pthread_attr_t attr;	559	pthread_attr_t attr;
185		560
186	pthread_attr_init (&attr);	561	pthread_attr_init (&attr);
187	pthread_attr_setstacksize (&attr, STACKSIZE);	562	pthread_attr_setstacksize (&attr, STACKSIZE);
188	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);	563	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
189		564
190	sigfillset (&fullsigset);	565	sigfillset (&fullsigset);
		566
		567	LOCK (wrklock);
191	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	568	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
192		569
193	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)	570	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
		571	{
		572	wrk->prev = &wrk_first;
		573	wrk->next = wrk_first.next;
		574	wrk_first.next->prev = wrk;
		575	wrk_first.next = wrk;
194	started++;	576	started++;
		577	}
		578	else
		579	free (wrk);
195		580
196	sigprocmask (SIG_SETMASK, &oldsigset, 0);	581	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		582	UNLOCK (wrklock);
197	}	583	}
198		584
199	static void	585	static void req_send (aio_req req)
200	send_req (aio_req req)
201	{	586	{
		587	while (started < wanted && nreqs >= started)
		588	start_thread ();
		589
202	nreqs++;	590	++nreqs;
203		591
204	pthread_mutex_lock (&reqlock);	592	LOCK (reqlock);
205		593	reqq_push (&req_queue, req);
206	req->next = 0;
207
208	if (reqe)
209	{
210	reqe->next = req;
211	reqe = req;
212	}
213	else
214	reqe = reqs = req;
215
216	pthread_cond_signal (&reqwait);	594	pthread_cond_signal (&reqwait);
217	pthread_mutex_unlock (&reqlock);	595	UNLOCK (reqlock);
218		596
219	while (nreqs > max_outstanding)	597	if (nreqs > max_outstanding)
		598	for (;;)
		599	{
		600	poll_cb ();
		601
		602	if (nreqs <= max_outstanding)
		603	break;
		604
		605	poll_wait ();
		606	}
		607	}
		608
		609	static void end_thread (void)
		610	{
		611	aio_req req;
		612
		613	Newz (0, req, 1, aio_cb);
		614
		615	req->type = REQ_QUIT;
		616	req->pri = PRI_MAX + PRI_BIAS;
		617
		618	req_send (req);
		619	}
		620
		621	static void min_parallel (int nthreads)
		622	{
		623	if (wanted < nthreads)
		624	wanted = nthreads;
		625	}
		626
		627	static void max_parallel (int nthreads)
		628	{
		629	int cur = started;
		630
		631	if (wanted > nthreads)
		632	wanted = nthreads;
		633
		634	while (cur > wanted)
		635	{
		636	end_thread ();
		637	cur--;
		638	}
		639
		640	while (started > wanted)
220	{	641	{
221	poll_wait ();	642	poll_wait ();
222	poll_cb ();	643	poll_cb ();
223	}	644	}
224	}	645	}
225		646
226	static void	647	static void create_pipe ()
227	end_thread (void)
228	{	648	{
229	aio_req req;	649	if (pipe (respipe))
230	New (0, req, 1, aio_cb);	650	croak ("unable to initialize result pipe");
231	req->type = REQ_QUIT;
232		651
233	send_req (req);	652	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
234	}	653	croak ("cannot set result pipe to nonblocking mode");
235		654
236	static void	655	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
237	read_write (int dowrite, int fd, off_t offset, size_t length,	656	croak ("cannot set result pipe to nonblocking mode");
238	SV *data, STRLEN dataoffset, SV *callback)	657	}
239	{
240	aio_req req;
241	STRLEN svlen;
242	char *svptr = SvPV (data, svlen);
243		658
244	SvUPGRADE (data, SVt_PV);	659	/*****************************************************************************/
245	SvPOK_on (data);	660	/* work around various missing functions */
246		661
247	if (dataoffset < 0)	662	#if !HAVE_PREADWRITE
		663	# define pread aio_pread
		664	# define pwrite aio_pwrite
		665
		666	/*
		667	* make our pread/pwrite safe against themselves, but not against
		668	* normal read/write by using a mutex. slows down execution a lot,
		669	* but that's your problem, not mine.
		670	*/
		671	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
		672
		673	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		674	{
		675	ssize_t res;
		676	off_t ooffset;
		677
		678	LOCK (preadwritelock);
		679	ooffset = lseek (fd, 0, SEEK_CUR);
		680	lseek (fd, offset, SEEK_SET);
		681	res = read (fd, buf, count);
		682	lseek (fd, ooffset, SEEK_SET);
		683	UNLOCK (preadwritelock);
		684
		685	return res;
		686	}
		687
		688	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		689	{
		690	ssize_t res;
		691	off_t ooffset;
		692
		693	LOCK (preadwritelock);
		694	ooffset = lseek (fd, 0, SEEK_CUR);
		695	lseek (fd, offset, SEEK_SET);
		696	res = write (fd, buf, count);
		697	lseek (fd, offset, SEEK_SET);
		698	UNLOCK (preadwritelock);
		699
		700	return res;
		701	}
		702	#endif
		703
		704	#if !HAVE_FDATASYNC
		705	# define fdatasync fsync
		706	#endif
		707
		708	#if !HAVE_READAHEAD
		709	# define readahead aio_readahead
		710
		711	static ssize_t readahead (int fd, off_t offset, size_t count)
		712	{
		713	dBUF;
		714
		715	while (count > 0)
		716	{
		717	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
		718
		719	pread (fd, aio_buf, len, offset);
248	dataoffset += svlen;	720	offset += len;
249		721	count -= len;
250	if (dataoffset < 0 || dataoffset > svlen)
251	croak ("data offset outside of string");
252
253	if (dowrite)
254	{	722	}
255	/* write: check length and adjust. */	723
256	if (length < 0 || length + dataoffset > svlen)	724	errno = 0;
257	length = svlen - dataoffset;	725	}
		726	#endif
		727
		728	#if !HAVE_READDIR_R
		729	# define readdir_r aio_readdir_r
		730
		731	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		732
		733	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		734	{
		735	struct dirent *e;
		736	int errorno;
		737
		738	LOCK (readdirlock);
		739
		740	e = readdir (dirp);
		741	errorno = errno;
		742
		743	if (e)
		744	{
		745	*res = ent;
		746	strcpy (ent->d_name, e->d_name);
258	}	747	}
259	else	748	else
		749	*res = 0;
		750
		751	UNLOCK (readdirlock);
		752
		753	errno = errorno;
		754	return e ? 0 : -1;
		755	}
		756	#endif
		757
		758	/* sendfile always needs emulation */
		759	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
		760	{
		761	ssize_t res;
		762
		763	if (!count)
		764	return 0;
		765
		766	#if HAVE_SENDFILE
		767	# if __linux
		768	res = sendfile (ofd, ifd, &offset, count);
		769
		770	# elif __freebsd
		771	/*
		772	* Of course, the freebsd sendfile is a dire hack with no thoughts
		773	* wasted on making it similar to other I/O functions.
		774	*/
		775	{
		776	off_t sbytes;
		777	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		778
		779	if (res < 0 && sbytes)
		780	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */
		781	res = sbytes;
		782	}
		783
		784	# elif __hpux
		785	res = sendfile (ofd, ifd, offset, count, 0, 0);
		786
		787	# elif __solaris
		788	{
		789	struct sendfilevec vec;
		790	size_t sbytes;
		791
		792	vec.sfv_fd = ifd;
		793	vec.sfv_flag = 0;
		794	vec.sfv_off = offset;
		795	vec.sfv_len = count;
		796
		797	res = sendfilev (ofd, &vec, 1, &sbytes);
		798
		799	if (res < 0 && sbytes)
		800	res = sbytes;
		801	}
		802
		803	# endif
		804	#else
		805	res = -1;
		806	errno = ENOSYS;
		807	#endif
		808
		809	if (res < 0
		810	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		811	#if __solaris
		812	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		813	#endif
		814	)
		815	)
		816	{
		817	/* emulate sendfile. this is a major pain in the ass */
		818	dBUF;
		819
		820	res = 0;
		821
		822	while (count)
		823	{
		824	ssize_t cnt;
		825
		826	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
		827
		828	if (cnt <= 0)
		829	{
		830	if (cnt && !res) res = -1;
		831	break;
		832	}
		833
		834	cnt = write (ofd, aio_buf, cnt);
		835
		836	if (cnt <= 0)
		837	{
		838	if (cnt && !res) res = -1;
		839	break;
		840	}
		841
		842	offset += cnt;
		843	res += cnt;
		844	count -= cnt;
		845	}
		846	}
		847
		848	return res;
		849	}
		850
		851	/* read a full directory */
		852	static void scandir_ (aio_req req, worker *self)
		853	{
		854	DIR *dirp;
		855	union
		856	{
		857	struct dirent d;
		858	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		859	} *u;
		860	struct dirent *entp;
		861	char *name, *names;
		862	int memlen = 4096;
		863	int memofs = 0;
		864	int res = 0;
		865	int errorno;
		866
		867	LOCK (wrklock);
		868	self->dirp = dirp = opendir (req->dataptr);
		869	self->dbuf = u = malloc (sizeof (*u));
		870	UNLOCK (wrklock);
		871
		872	req->data2ptr = names = malloc (memlen);
		873
		874	if (dirp && u && names)
		875	for (;;)
260	{	876	{
261	/* read: grow scalar as necessary */	877	errno = 0;
262	svptr = SvGROW (data, length + dataoffset);	878	readdir_r (dirp, &u->d, &entp);
		879
		880	if (!entp)
		881	break;
		882
		883	name = entp->d_name;
		884
		885	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		886	{
		887	int len = strlen (name) + 1;
		888
		889	res++;
		890
		891	while (memofs + len > memlen)
		892	{
		893	memlen *= 2;
		894	LOCK (wrklock);
		895	req->data2ptr = names = realloc (names, memlen);
		896	UNLOCK (wrklock);
		897
		898	if (!names)
		899	break;
		900	}
		901
		902	memcpy (names + memofs, name, len);
		903	memofs += len;
		904	}
263	}	905	}
264		906
265	if (length < 0)	907	if (errno)
266	croak ("length must not be negative");	908	res = -1;
267		909
268	Newz (0, req, 1, aio_cb);	910	req->result = res;
269
270	if (!req)
271	croak ("out of memory during aio_req allocation");
272
273	req->type = dowrite ? REQ_WRITE : REQ_READ;
274	req->fd = fd;
275	req->offset = offset;
276	req->length = length;
277	req->data = SvREFCNT_inc (data);
278	req->dataptr = (char *)svptr + dataoffset;
279	req->callback = SvREFCNT_inc (callback);
280
281	send_req (req);
282	}	911	}
283		912
284	static void *	913	/*****************************************************************************/
		914
285	aio_proc (void *thr_arg)	915	static void *aio_proc (void *thr_arg)
286	{	916	{
287	aio_req req;	917	aio_req req;
288	int type;	918	int type;
		919	worker *self = (worker *)thr_arg;
289		920
290	do	921	do
291	{	922	{
292	pthread_mutex_lock (&reqlock);	923	LOCK (reqlock);
293		924
294	for (;;)	925	for (;;)
295	{	926	{
296	req = reqs;	927	self->req = req = reqq_shift (&req_queue);
297
298	if (reqs)
299	{
300	reqs = reqs->next;
301	if (!reqs) reqe = 0;
302	}
303		928
304	if (req)	929	if (req)
305	break;	930	break;
306		931
307	pthread_cond_wait (&reqwait, &reqlock);	932	pthread_cond_wait (&reqwait, &reqlock);
308	}	933	}
309		934
310	pthread_mutex_unlock (&reqlock);	935	UNLOCK (reqlock);
311		936
312	errno = 0; /* strictly unnecessary */	937	errno = 0; /* strictly unnecessary */
		938	type = req->type; /* remember type for QUIT check */
313		939
314	type = req->type;	940	if (!(req->flags & FLAG_CANCELLED))
315
316	switch (type)	941	switch (type)
317	{	942	{
318	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	943	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
319	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	944	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
320	#if SYS_readahead	945
321	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	946	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
322	#else	947	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length, self); break;
323	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
324	#endif
325		948
326	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	949	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
327	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	950	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
328	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	951	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
329		952
330	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	953	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
331	case REQ_CLOSE: req->result = close (req->fd); break;	954	case REQ_CLOSE: req->result = close (req->fd); break;
332	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	955	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
333
334	case REQ_FSYNC: req->result = fsync (req->fd); break;	956	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		957	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		958	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
		959	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
		960
335	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	961	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
		962	case REQ_FSYNC: req->result = fsync (req->fd); break;
		963	case REQ_READDIR: scandir_ (req, self); break;
336		964
		965	case REQ_BUSY:
		966	{
		967	struct timeval tv;
		968
		969	tv.tv_sec = req->fd;
		970	tv.tv_usec = req->fd2;
		971
		972	req->result = select (0, 0, 0, 0, &tv);
		973	}
		974
		975	case REQ_GROUP:
		976	case REQ_NOP:
337	case REQ_QUIT:	977	case REQ_QUIT:
338	break;	978	break;
339		979
340	default:	980	default:
341	req->result = ENOSYS;	981	req->result = ENOSYS;
342	break;	982	break;
343	}	983	}
344		984
345	req->errorno = errno;	985	req->errorno = errno;
346		986
347	pthread_mutex_lock (&reslock);	987	LOCK (reslock);
348		988
349	req->next = 0;	989	if (!reqq_push (&res_queue, req))
350
351	if (rese)
352	{
353	rese->next = req;
354	rese = req;
355	}
356	else
357	{
358	rese = ress = req;
359
360	/* write a dummy byte to the pipe so fh becomes ready */	990	/* write a dummy byte to the pipe so fh becomes ready */
361	write (respipe [1], &respipe, 1);	991	write (respipe [1], &respipe, 1);
362	}
363		992
364	pthread_mutex_unlock (&reslock);	993	self->req = 0;
		994	worker_clear (self);
		995
		996	UNLOCK (reslock);
365	}	997	}
366	while (type != REQ_QUIT);	998	while (type != REQ_QUIT);
367		999
		1000	LOCK (wrklock);
		1001	worker_free (self);
		1002	UNLOCK (wrklock);
		1003
368	return 0;	1004	return 0;
369	}	1005	}
370		1006
		1007	/*****************************************************************************/
		1008
		1009	static void atfork_prepare (void)
		1010	{
		1011	LOCK (wrklock);
		1012	LOCK (reqlock);
		1013	LOCK (reslock);
		1014	#if !HAVE_PREADWRITE
		1015	LOCK (preadwritelock);
		1016	#endif
		1017	#if !HAVE_READDIR_R
		1018	LOCK (readdirlock);
		1019	#endif
		1020	}
		1021
		1022	static void atfork_parent (void)
		1023	{
		1024	#if !HAVE_READDIR_R
		1025	UNLOCK (readdirlock);
		1026	#endif
		1027	#if !HAVE_PREADWRITE
		1028	UNLOCK (preadwritelock);
		1029	#endif
		1030	UNLOCK (reslock);
		1031	UNLOCK (reqlock);
		1032	UNLOCK (wrklock);
		1033	}
		1034
		1035	static void atfork_child (void)
		1036	{
		1037	aio_req prv;
		1038
		1039	while (prv = reqq_shift (&req_queue))
		1040	req_free (prv);
		1041
		1042	while (prv = reqq_shift (&res_queue))
		1043	req_free (prv);
		1044
		1045	while (wrk_first.next != &wrk_first)
		1046	{
		1047	worker *wrk = wrk_first.next;
		1048
		1049	if (wrk->req)
		1050	req_free (wrk->req);
		1051
		1052	worker_clear (wrk);
		1053	worker_free (wrk);
		1054	}
		1055
		1056	started = 0;
		1057	nreqs = 0;
		1058
		1059	close (respipe [0]);
		1060	close (respipe [1]);
		1061	create_pipe ();
		1062
		1063	atfork_parent ();
		1064	}
		1065
		1066	#define dREQ \
		1067	aio_req req; \
		1068	int req_pri = next_pri; \
		1069	next_pri = DEFAULT_PRI + PRI_BIAS; \
		1070	\
		1071	if (SvOK (callback) && !SvROK (callback)) \
		1072	croak ("callback must be undef or of reference type"); \
		1073	\
		1074	Newz (0, req, 1, aio_cb); \
		1075	if (!req) \
		1076	croak ("out of memory during aio_req allocation"); \
		1077	\
		1078	req->callback = newSVsv (callback); \
		1079	req->pri = req_pri
		1080
		1081	#define REQ_SEND \
		1082	req_send (req); \
		1083	\
		1084	if (GIMME_V != G_VOID) \
		1085	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		1086
371	MODULE = IO::AIO PACKAGE = IO::AIO	1087	MODULE = IO::AIO PACKAGE = IO::AIO
372		1088
373	PROTOTYPES: ENABLE	1089	PROTOTYPES: ENABLE
374		1090
375	BOOT:	1091	BOOT:
376	{	1092	{
377	if (pipe (respipe))	1093	HV *stash = gv_stashpv ("IO::AIO", 1);
378	croak ("unable to initialize result pipe");	1094	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		1095	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1096	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
379		1097
380	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	1098	create_pipe ();
381	croak ("cannot set result pipe to nonblocking mode");	1099	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
382
383	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
384	croak ("cannot set result pipe to nonblocking mode");
385	}	1100	}
386		1101
387	void	1102	void
388	min_parallel(nthreads)	1103	min_parallel (nthreads)
389	int nthreads	1104	int nthreads
390	PROTOTYPE: $	1105	PROTOTYPE: $
391	CODE:
392	while (nthreads > started)
393	start_thread ();
394		1106
395	void	1107	void
396	max_parallel(nthreads)	1108	max_parallel (nthreads)
397	int nthreads	1109	int nthreads
398	PROTOTYPE: $	1110	PROTOTYPE: $
399	CODE:
400	{
401	int cur = started;
402	while (cur > nthreads)
403	{
404	end_thread ();
405	cur--;
406	}
407
408	while (started > nthreads)
409	{
410	poll_wait ();
411	poll_cb ();
412	}
413	}
414		1111
415	int	1112	int
416	max_outstanding(nreqs)	1113	max_outstanding (nreqs)
417	int nreqs	1114	int nreqs
418	PROTOTYPE: $	1115	PROTOTYPE: $
419	CODE:	1116	CODE:
420	RETVAL = max_outstanding;	1117	RETVAL = max_outstanding;
421	max_outstanding = nreqs;	1118	max_outstanding = nreqs;
422		1119
423	void	1120	void
424	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1121	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
425	SV * pathname	1122	SV * pathname
426	int flags	1123	int flags
427	int mode	1124	int mode
428	SV * callback	1125	SV * callback
429	PROTOTYPE: $$$;$	1126	PROTOTYPE: $$$;$
430	CODE:	1127	PPCODE:
431	{	1128	{
432	aio_req req;	1129	dREQ;
433
434	Newz (0, req, 1, aio_cb);
435
436	if (!req)
437	croak ("out of memory during aio_req allocation");
438		1130
439	req->type = REQ_OPEN;	1131	req->type = REQ_OPEN;
440	req->data = newSVsv (pathname);	1132	req->data = newSVsv (pathname);
441	req->dataptr = SvPV_nolen (req->data);	1133	req->dataptr = SvPVbyte_nolen (req->data);
442	req->fd = flags;	1134	req->fd = flags;
443	req->mode = mode;	1135	req->mode = mode;
444	req->callback = SvREFCNT_inc (callback);
445		1136
446	send_req (req);	1137	REQ_SEND;
447	}	1138	}
448		1139
449	void	1140	void
450	aio_close(fh,callback=&PL_sv_undef)	1141	aio_close (fh,callback=&PL_sv_undef)
451	InputStream fh	1142	SV * fh
452	SV * callback	1143	SV * callback
453	PROTOTYPE: $;$	1144	PROTOTYPE: $;$
454	ALIAS:	1145	ALIAS:
455	aio_close = REQ_CLOSE	1146	aio_close = REQ_CLOSE
456	aio_fsync = REQ_FSYNC	1147	aio_fsync = REQ_FSYNC
457	aio_fdatasync = REQ_FDATASYNC	1148	aio_fdatasync = REQ_FDATASYNC
458	CODE:	1149	PPCODE:
		1150	{
		1151	dREQ;
		1152
		1153	req->type = ix;
		1154	req->fh = newSVsv (fh);
		1155	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
		1156
		1157	REQ_SEND (req);
		1158	}
		1159
		1160	void
		1161	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
		1162	SV * fh
		1163	UV offset
		1164	UV length
		1165	SV * data
		1166	UV dataoffset
		1167	SV * callback
		1168	ALIAS:
		1169	aio_read = REQ_READ
		1170	aio_write = REQ_WRITE
		1171	PROTOTYPE: $$$$$;$
		1172	PPCODE:
459	{	1173	{
460	aio_req req;	1174	aio_req req;
		1175	STRLEN svlen;
		1176	char *svptr = SvPVbyte (data, svlen);
461		1177
462	Newz (0, req, 1, aio_cb);	1178	SvUPGRADE (data, SVt_PV);
		1179	SvPOK_on (data);
463		1180
464	if (!req)	1181	if (dataoffset < 0)
465	croak ("out of memory during aio_req allocation");	1182	dataoffset += svlen;
466		1183
467	req->type = ix;	1184	if (dataoffset < 0 || dataoffset > svlen)
468	req->fd = PerlIO_fileno (fh);	1185	croak ("data offset outside of string");
469	req->callback = SvREFCNT_inc (callback);
470		1186
471	send_req (req);	1187	if (ix == REQ_WRITE)
472	}	1188	{
473		1189	/* write: check length and adjust. */
474	void	1190	if (length < 0 || length + dataoffset > svlen)
475	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1191	length = svlen - dataoffset;
476	InputStream fh	1192	}
477	UV offset	1193	else
478	IV length	1194	{
479	SV * data	1195	/* read: grow scalar as necessary */
480	IV dataoffset	1196	svptr = SvGROW (data, length + dataoffset);
481	SV * callback	1197	}
482	PROTOTYPE: $$$$$;$
483	CODE:
484	read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
485
486	void
487	aio_write(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
488	OutputStream fh
489	UV offset
490	IV length
491	SV * data
492	IV dataoffset
493	SV * callback
494	PROTOTYPE: $$$$$;$
495	CODE:
496	read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
497
498	void
499	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
500	InputStream fh
501	UV offset
502	IV length
503	SV * callback
504	PROTOTYPE: $$$;$
505	CODE:
506	{
507	aio_req req;
508		1198
509	if (length < 0)	1199	if (length < 0)
510	croak ("length must not be negative");	1200	croak ("length must not be negative");
511		1201
512	Newz (0, req, 1, aio_cb);	1202	{
		1203	dREQ;
513		1204
514	if (!req)	1205	req->type = ix;
515	croak ("out of memory during aio_req allocation");	1206	req->fh = newSVsv (fh);
		1207	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
		1208	: IoOFP (sv_2io (fh)));
		1209	req->offset = offset;
		1210	req->length = length;
		1211	req->data = SvREFCNT_inc (data);
		1212	req->dataptr = (char *)svptr + dataoffset;
		1213
		1214	if (!SvREADONLY (data))
		1215	{
		1216	SvREADONLY_on (data);
		1217	req->data2ptr = (void *)data;
		1218	}
		1219
		1220	REQ_SEND;
		1221	}
		1222	}
		1223
		1224	void
		1225	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1226	SV * out_fh
		1227	SV * in_fh
		1228	UV in_offset
		1229	UV length
		1230	SV * callback
		1231	PROTOTYPE: $$$$;$
		1232	PPCODE:
		1233	{
		1234	dREQ;
		1235
		1236	req->type = REQ_SENDFILE;
		1237	req->fh = newSVsv (out_fh);
		1238	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1239	req->fh2 = newSVsv (in_fh);
		1240	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1241	req->offset = in_offset;
		1242	req->length = length;
		1243
		1244	REQ_SEND;
		1245	}
		1246
		1247	void
		1248	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
		1249	SV * fh
		1250	UV offset
		1251	IV length
		1252	SV * callback
		1253	PROTOTYPE: $$$;$
		1254	PPCODE:
		1255	{
		1256	dREQ;
516		1257
517	req->type = REQ_READAHEAD;	1258	req->type = REQ_READAHEAD;
		1259	req->fh = newSVsv (fh);
518	req->fd = PerlIO_fileno (fh);	1260	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
519	req->offset = offset;	1261	req->offset = offset;
520	req->length = length;	1262	req->length = length;
521	req->callback = SvREFCNT_inc (callback);
522		1263
523	send_req (req);	1264	REQ_SEND;
524	}	1265	}
525		1266
526	void	1267	void
527	aio_stat(fh_or_path,callback=&PL_sv_undef)	1268	aio_stat (fh_or_path,callback=&PL_sv_undef)
528	SV * fh_or_path	1269	SV * fh_or_path
529	SV * callback	1270	SV * callback
530	ALIAS:	1271	ALIAS:
531	aio_stat = REQ_STAT	1272	aio_stat = REQ_STAT
532	aio_lstat = REQ_LSTAT	1273	aio_lstat = REQ_LSTAT
533	CODE:	1274	PPCODE:
534	{	1275	{
535	aio_req req;	1276	dREQ;
536
537	Newz (0, req, 1, aio_cb);
538
539	if (!req)
540	croak ("out of memory during aio_req allocation");
541		1277
542	New (0, req->statdata, 1, Stat_t);	1278	New (0, req->statdata, 1, Stat_t);
543
544	if (!req->statdata)	1279	if (!req->statdata)
		1280	{
		1281	req_free (req);
545	croak ("out of memory during aio_req->statdata allocation");	1282	croak ("out of memory during aio_req->statdata allocation");
		1283	}
546		1284
547	if (SvPOK (fh_or_path))	1285	if (SvPOK (fh_or_path))
548	{	1286	{
549	req->type = ix;	1287	req->type = ix;
550	req->data = newSVsv (fh_or_path);	1288	req->data = newSVsv (fh_or_path);
551	req->dataptr = SvPV_nolen (req->data);	1289	req->dataptr = SvPVbyte_nolen (req->data);
552	}	1290	}
553	else	1291	else
554	{	1292	{
555	req->type = REQ_FSTAT;	1293	req->type = REQ_FSTAT;
		1294	req->fh = newSVsv (fh_or_path);
556	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1295	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
557	}	1296	}
558		1297
559	req->callback = SvREFCNT_inc (callback);	1298	REQ_SEND;
560
561	send_req (req);
562	}	1299	}
563		1300
564	void	1301	void
565	aio_unlink(pathname,callback=&PL_sv_undef)	1302	aio_unlink (pathname,callback=&PL_sv_undef)
566	SV * pathname	1303	SV * pathname
567	SV * callback	1304	SV * callback
		1305	ALIAS:
		1306	aio_unlink = REQ_UNLINK
		1307	aio_rmdir = REQ_RMDIR
		1308	aio_readdir = REQ_READDIR
568	CODE:	1309	PPCODE:
569	{	1310	{
570	aio_req req;	1311	dREQ;
571		1312
572	Newz (0, req, 1, aio_cb);	1313	req->type = ix;
		1314	req->data = newSVsv (pathname);
		1315	req->dataptr = SvPVbyte_nolen (req->data);
573		1316
574	if (!req)	1317	REQ_SEND;
575	croak ("out of memory during aio_req allocation");	1318	}
		1319
		1320	void
		1321	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1322	SV * oldpath
		1323	SV * newpath
		1324	SV * callback
		1325	ALIAS:
		1326	aio_link = REQ_LINK
		1327	aio_symlink = REQ_SYMLINK
		1328	aio_rename = REQ_RENAME
		1329	PPCODE:
		1330	{
		1331	dREQ;
576		1332
577	req->type = REQ_UNLINK;	1333	req->type = ix;
		1334	req->fh = newSVsv (oldpath);
		1335	req->data2ptr = SvPVbyte_nolen (req->fh);
578	req->data = newSVsv (pathname);	1336	req->data = newSVsv (newpath);
579	req->dataptr = SvPV_nolen (req->data);	1337	req->dataptr = SvPVbyte_nolen (req->data);
580	req->callback = SvREFCNT_inc (callback);
581		1338
582	send_req (req);	1339	REQ_SEND;
583	}	1340	}
584		1341
585	void	1342	void
		1343	aio_busy (delay,callback=&PL_sv_undef)
		1344	double delay
		1345	SV * callback
		1346	PPCODE:
		1347	{
		1348	dREQ;
		1349
		1350	req->type = REQ_BUSY;
		1351	req->fd = delay < 0. ? 0 : delay;
		1352	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1353
		1354	REQ_SEND;
		1355	}
		1356
		1357	void
		1358	aio_group (callback=&PL_sv_undef)
		1359	SV * callback
		1360	PROTOTYPE: ;$
		1361	PPCODE:
		1362	{
		1363	dREQ;
		1364
		1365	req->type = REQ_GROUP;
		1366	req_send (req);
		1367
		1368	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1369	}
		1370
		1371	void
		1372	aio_nop (callback=&PL_sv_undef)
		1373	SV * callback
		1374	PPCODE:
		1375	{
		1376	dREQ;
		1377
		1378	req->type = REQ_NOP;
		1379
		1380	REQ_SEND;
		1381	}
		1382
		1383	void
		1384	aioreq_pri (int pri = DEFAULT_PRI)
		1385	CODE:
		1386	if (pri < PRI_MIN) pri = PRI_MIN;
		1387	if (pri > PRI_MAX) pri = PRI_MAX;
		1388	next_pri = pri + PRI_BIAS;
		1389
		1390	void
		1391	aioreq_nice (int nice = 0)
		1392	CODE:
		1393	nice = next_pri - nice;
		1394	if (nice < PRI_MIN) nice = PRI_MIN;
		1395	if (nice > PRI_MAX) nice = PRI_MAX;
		1396	next_pri = nice + PRI_BIAS;
		1397
		1398	void
586	flush()	1399	flush ()
587	PROTOTYPE:	1400	PROTOTYPE:
588	CODE:	1401	CODE:
589	while (nreqs)	1402	while (nreqs)
590	{	1403	{
591	poll_wait ();	1404	poll_wait ();
…		…
631	CODE:	1444	CODE:
632	RETVAL = nreqs;	1445	RETVAL = nreqs;
633	OUTPUT:	1446	OUTPUT:
634	RETVAL	1447	RETVAL
635		1448
		1449	PROTOTYPES: DISABLE
		1450
		1451	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1452
		1453	void
		1454	cancel (aio_req_ornot req)
		1455	CODE:
		1456	req_cancel (req);
		1457
		1458	void
		1459	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1460	CODE:
		1461	SvREFCNT_dec (req->callback);
		1462	req->callback = newSVsv (callback);
		1463
		1464	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1465
		1466	void
		1467	add (aio_req grp, ...)
		1468	PPCODE:
		1469	{
		1470	int i;
		1471	aio_req req;
		1472
		1473	if (grp->fd == 2)
		1474	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1475
		1476	for (i = 1; i < items; ++i )
		1477	{
		1478	if (GIMME_V != G_VOID)
		1479	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1480
		1481	req = SvAIO_REQ (ST (i));
		1482
		1483	if (req)
		1484	{
		1485	++grp->length;
		1486	req->grp = grp;
		1487
		1488	req->grp_prev = 0;
		1489	req->grp_next = grp->grp_first;
		1490
		1491	if (grp->grp_first)
		1492	grp->grp_first->grp_prev = req;
		1493
		1494	grp->grp_first = req;
		1495	}
		1496	}
		1497	}
		1498
		1499	void
		1500	result (aio_req grp, ...)
		1501	CODE:
		1502	{
		1503	int i;
		1504	AV *av = newAV ();
		1505
		1506	for (i = 1; i < items; ++i )
		1507	av_push (av, newSVsv (ST (i)));
		1508
		1509	SvREFCNT_dec (grp->data);
		1510	grp->data = (SV *)av;
		1511	}
		1512
		1513	void
		1514	limit (aio_req grp, int limit)
		1515	CODE:
		1516	grp->fd2 = limit;
		1517	aio_grp_feed (grp);
		1518
		1519	void
		1520	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1521	CODE:
		1522	{
		1523	SvREFCNT_dec (grp->fh2);
		1524	grp->fh2 = newSVsv (callback);
		1525
		1526	if (grp->fd2 <= 0)
		1527	grp->fd2 = 2;
		1528
		1529	aio_grp_feed (grp);
		1530	}
		1531

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