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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.21 by root, Sun Aug 7 03:26:10 2005 UTC vs.
Revision 1.79 by root, Thu Oct 26 16:28:33 2006 UTC

		1	/* solaris */
		2	#define _POSIX_PTHREAD_SEMANTICS 1
		3
		4	#if __linux && !defined(_GNU_SOURCE)
		5	# define _GNU_SOURCE
		6	#endif
		7
		8	/* just in case */
1	#define _REENTRANT 1	9	#define _REENTRANT 1
		10
2	#include <errno.h>	11	#include <errno.h>
3		12
4	#include "EXTERN.h"	13	#include "EXTERN.h"
5	#include "perl.h"	14	#include "perl.h"
6	#include "XSUB.h"	15	#include "XSUB.h"
7		16
8	#include "autoconf/config.h"	17	#include "autoconf/config.h"
9		18
		19	#include <pthread.h>
		20
		21	#include <stddef.h>
		22	#include <errno.h>
		23	#include <sys/time.h>
		24	#include <sys/select.h>
10	#include <sys/types.h>	25	#include <sys/types.h>
11	#include <sys/stat.h>	26	#include <sys/stat.h>
12		27	#include <limits.h>
13	#include <unistd.h>	28	#include <unistd.h>
14	#include <fcntl.h>	29	#include <fcntl.h>
15	#include <signal.h>	30	#include <signal.h>
16	#include <sched.h>	31	#include <sched.h>
17		32
18	#include <pthread.h>	33	#if HAVE_SENDFILE
		34	# if __linux
		35	# include <sys/sendfile.h>
		36	# elif __freebsd
		37	# include <sys/socket.h>
		38	# include <sys/uio.h>
		39	# elif __hpux
		40	# include <sys/socket.h>
		41	# elif __solaris /* not yet */
		42	# include <sys/sendfile.h>
		43	# else
		44	# error sendfile support requested but not available
		45	# endif
		46	#endif
19		47
20	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	48	/* used for struct dirent, AIX doesn't provide it */
21	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	49	#ifndef NAME_MAX
22	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	50	# define NAME_MAX 4096
		51	#endif
		52
		53	#ifndef PTHREAD_STACK_MIN
		54	/* care for broken platforms, e.g. windows */
		55	# define PTHREAD_STACK_MIN 16384
		56	#endif
23		57
24	#if __ia64	58	#if __ia64
25	# define STACKSIZE 65536	59	# define STACKSIZE 65536
		60	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		61	# define STACKSIZE PTHREAD_STACK_MIN
26	#else	62	#else
27	# define STACKSIZE 4096	63	# define STACKSIZE 16384
28	#endif	64	#endif
		65
		66	/* wether word reads are potentially non-atomic.
		67	* this is conservatice, likely most arches this runs
		68	* on have atomic word read/writes.
		69	*/
		70	#ifndef WORDREAD_UNSAFE
		71	# if __i386 || __x86_64
		72	# define WORDREAD_UNSAFE 0
		73	# else
		74	# define WORDREAD_UNSAFE 1
		75	# endif
		76	#endif
		77
		78	/* buffer size for various temporary buffers */
		79	#define AIO_BUFSIZE 65536
		80
		81	#define dBUF \
		82	char *aio_buf; \
		83	LOCK (wrklock); \
		84	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		85	UNLOCK (wrklock); \
		86	if (!aio_buf) \
		87	return -1;
29		88
30	enum {	89	enum {
31	REQ_QUIT,	90	REQ_QUIT,
32	REQ_OPEN, REQ_CLOSE,	91	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,	92	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		93	REQ_SENDFILE,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	94	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35	REQ_FSYNC, REQ_FDATASYNC,	95	REQ_FSYNC, REQ_FDATASYNC,
		96	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
		97	REQ_READDIR,
		98	REQ_LINK, REQ_SYMLINK,
		99	REQ_GROUP, REQ_NOP,
		100	REQ_BUSY,
36	};	101	};
37		102
		103	#define AIO_REQ_KLASS "IO::AIO::REQ"
		104	#define AIO_GRP_KLASS "IO::AIO::GRP"
		105
38	typedef struct aio_cb {	106	typedef struct aio_cb
		107	{
39	struct aio_cb *volatile next;	108	struct aio_cb *volatile next;
40		109
41	int type;	110	SV *data, *callback;
42		111	SV *fh, *fh2;
43	int fd;	112	void *dataptr, *data2ptr;
		113	Stat_t *statdata;
44	off_t offset;	114	off_t offset;
45	size_t length;	115	size_t length;
46	ssize_t result;	116	ssize_t result;
		117
		118	STRLEN dataoffset;
		119	int type;
		120	int fd, fd2;
		121	int errorno;
47	mode_t mode; /* open */	122	mode_t mode; /* open */
48	int errorno;
49	SV *data, *callback, *fh;
50	void *dataptr;
51	STRLEN dataoffset;
52		123
53	Stat_t *statdata;	124	unsigned char flags;
		125	unsigned char pri;
		126
		127	SV *self; /* the perl counterpart of this request, if any */
		128	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
54	} aio_cb;	129	} aio_cb;
55		130
		131	enum {
		132	FLAG_CANCELLED = 0x01,
		133	};
		134
56	typedef aio_cb *aio_req;	135	typedef aio_cb *aio_req;
		136	typedef aio_cb *aio_req_ornot;
57		137
58	static int started;	138	enum {
59	static volatile int nreqs;	139	PRI_MIN = -4,
60	static int max_outstanding = 1<<30;	140	PRI_MAX = 4,
		141
		142	DEFAULT_PRI = 0,
		143	PRI_BIAS = -PRI_MIN,
		144	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		145	};
		146
		147	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		148
		149	static unsigned int started, wanted;
		150	static volatile unsigned int nreqs, nready, npending;
		151	static volatile unsigned int max_outstanding = 0xffffffff;
61	static int respipe [2];	152	static int respipe [2];
62		153
		154	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		155	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		156	#else
		157	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
		158	#endif
		159
		160	#define LOCK(mutex) pthread_mutex_lock (&(mutex))
		161	#define UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
		162
		163	/* worker threads management */
		164	static pthread_mutex_t wrklock = AIO_MUTEX_INIT;
		165
		166	typedef struct worker {
		167	/* locked by wrklock */
		168	struct worker *prev, *next;
		169
		170	pthread_t tid;
		171
		172	/* locked by reslock, reqlock or wrklock */
		173	aio_req req; /* currently processed request */
		174	void *dbuf;
		175	DIR *dirp;
		176	} worker;
		177
		178	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		179
		180	static void worker_clear (worker *wrk)
		181	{
		182	if (wrk->dirp)
		183	{
		184	closedir (wrk->dirp);
		185	wrk->dirp = 0;
		186	}
		187
		188	if (wrk->dbuf)
		189	{
		190	free (wrk->dbuf);
		191	wrk->dbuf = 0;
		192	}
		193	}
		194
		195	static void worker_free (worker *wrk)
		196	{
		197	wrk->next->prev = wrk->prev;
		198	wrk->prev->next = wrk->next;
		199
		200	free (wrk);
		201	}
		202
63	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	203	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
64	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	204	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
65	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	205	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
66		206
67	static volatile aio_req reqs, reqe; /* queue start, queue end */	207	/*
68	static volatile aio_req ress, rese; /* queue start, queue end */	208	* a somewhat faster data structure might be nice, but
		209	* with 8 priorities this actually needs <20 insns
		210	* per shift, the most expensive operation.
		211	*/
		212	typedef struct {
		213	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		214	int size;
		215	} reqq;
69		216
70	static void	217	static reqq req_queue;
71	poll_wait ()	218	static reqq res_queue;
		219
		220	int reqq_push (reqq *q, aio_req req)
72	{	221	{
73	if (nreqs && !ress)	222	int pri = req->pri;
		223	req->next = 0;
		224
		225	if (q->qe[pri])
		226	{
		227	q->qe[pri]->next = req;
		228	q->qe[pri] = req;
74	{	229	}
		230	else
		231	q->qe[pri] = q->qs[pri] = req;
		232
		233	return q->size++;
		234	}
		235
		236	aio_req reqq_shift (reqq *q)
		237	{
		238	int pri;
		239
		240	if (!q->size)
		241	return 0;
		242
		243	--q->size;
		244
		245	for (pri = NUM_PRI; pri--; )
		246	{
		247	aio_req req = q->qs[pri];
		248
		249	if (req)
		250	{
		251	if (!(q->qs[pri] = req->next))
		252	q->qe[pri] = 0;
		253
		254	return req;
		255	}
		256	}
		257
		258	abort ();
		259	}
		260
		261	static int poll_cb (int max);
		262	static void req_invoke (aio_req req);
		263	static void req_free (aio_req req);
		264	static void req_cancel (aio_req req);
		265
		266	/* must be called at most once */
		267	static SV *req_sv (aio_req req, const char *klass)
		268	{
		269	if (!req->self)
		270	{
		271	req->self = (SV *)newHV ();
		272	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		273	}
		274
		275	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		276	}
		277
		278	static aio_req SvAIO_REQ (SV *sv)
		279	{
		280	MAGIC *mg;
		281
		282	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		283	croak ("object of class " AIO_REQ_KLASS " expected");
		284
		285	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		286
		287	return mg ? (aio_req)mg->mg_ptr : 0;
		288	}
		289
		290	static void aio_grp_feed (aio_req grp)
		291	{
		292	while (grp->length < grp->fd2 && !(grp->flags & FLAG_CANCELLED))
		293	{
		294	int old_len = grp->length;
		295
		296	if (grp->fh2 && SvOK (grp->fh2))
		297	{
		298	dSP;
		299
		300	ENTER;
		301	SAVETMPS;
		302	PUSHMARK (SP);
		303	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		304	PUTBACK;
		305	call_sv (grp->fh2, G_VOID | G_EVAL | G_KEEPERR);
		306	SPAGAIN;
		307	FREETMPS;
		308	LEAVE;
		309	}
		310
		311	/* stop if no progress has been made */
		312	if (old_len == grp->length)
		313	{
		314	SvREFCNT_dec (grp->fh2);
		315	grp->fh2 = 0;
		316	break;
		317	}
		318	}
		319	}
		320
		321	static void aio_grp_dec (aio_req grp)
		322	{
		323	--grp->length;
		324
		325	/* call feeder, if applicable */
		326	aio_grp_feed (grp);
		327
		328	/* finish, if done */
		329	if (!grp->length && grp->fd)
		330	{
		331	req_invoke (grp);
		332	req_free (grp);
		333	}
		334	}
		335
		336	static void poll_wait ()
		337	{
75	fd_set rfd;	338	fd_set rfd;
		339
		340	while (nreqs)
		341	{
		342	int size;
		343	if (WORDREAD_UNSAFE) LOCK (reslock);
		344	size = res_queue.size;
		345	if (WORDREAD_UNSAFE) UNLOCK (reslock);
		346
		347	if (size)
		348	return;
		349
76	FD_ZERO(&rfd);	350	FD_ZERO(&rfd);
77	FD_SET(respipe [0], &rfd);	351	FD_SET(respipe [0], &rfd);
78		352
79	select (respipe [0] + 1, &rfd, 0, 0, 0);	353	select (respipe [0] + 1, &rfd, 0, 0, 0);
80	}	354	}
81	}	355	}
82		356
83	static int	357	static void req_invoke (aio_req req)
84	poll_cb ()
85	{	358	{
86	dSP;	359	dSP;
87	int count = 0;
88	aio_req req, prv;
89		360
90	pthread_mutex_lock (&reslock);	361	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
91
92	{	362	{
93	/* read any signals sent by the worker threads */	363	ENTER;
94	char buf [32];	364	SAVETMPS;
95	while (read (respipe [0], buf, 32) > 0)	365	PUSHMARK (SP);
96	;	366	EXTEND (SP, 1);
97	}
98		367
99	req = ress;	368	switch (req->type)
100	ress = rese = 0;
101
102	pthread_mutex_unlock (&reslock);
103
104	while (req)
105	{
106	nreqs--;
107
108	if (req->type == REQ_QUIT)
109	started--;
110	else
111	{	369	{
112	int errorno = errno;	370	case REQ_READDIR:
113	errno = req->errorno;
114
115	if (req->type == REQ_READ)
116	SvCUR_set (req->data, req->dataoffset
117	+ req->result > 0 ? req->result : 0);
118
119	if (req->data)
120	SvREFCNT_dec (req->data);
121
122	if (req->fh)
123	SvREFCNT_dec (req->fh);
124
125	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
126	{	371	{
127	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	372	SV *rv = &PL_sv_undef;
128	PL_laststatval = req->result;
129	PL_statcache = *(req->statdata);
130		373
131	Safefree (req->statdata);	374	if (req->result >= 0)
		375	{
		376	int i;
		377	char *buf = req->data2ptr;
		378	AV *av = newAV ();
		379
		380	av_extend (av, req->result - 1);
		381
		382	for (i = 0; i < req->result; ++i)
		383	{
		384	SV *sv = newSVpv (buf, 0);
		385
		386	av_store (av, i, sv);
		387	buf += SvCUR (sv) + 1;
		388	}
		389
		390	rv = sv_2mortal (newRV_noinc ((SV *)av));
		391	}
		392
		393	PUSHs (rv);
132	}	394	}
		395	break;
133		396
134	ENTER;	397	case REQ_OPEN:
135	PUSHMARK (SP);
136	XPUSHs (sv_2mortal (newSViv (req->result)));
137
138	if (req->type == REQ_OPEN)
139	{	398	{
140	/* convert fd to fh */	399	/* convert fd to fh */
141	SV *fh;	400	SV *fh;
142		401
		402	PUSHs (sv_2mortal (newSViv (req->result)));
143	PUTBACK;	403	PUTBACK;
144	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	404	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
145	SPAGAIN;	405	SPAGAIN;
146		406
147	fh = SvREFCNT_inc (POPs);	407	fh = SvREFCNT_inc (POPs);
148		408
149	PUSHMARK (SP);	409	PUSHMARK (SP);
150	XPUSHs (sv_2mortal (fh));	410	XPUSHs (sv_2mortal (fh));
151	}	411	}
		412	break;
152		413
153	if (SvOK (req->callback))	414	case REQ_GROUP:
		415	req->fd = 2; /* mark group as finished */
		416
		417	if (req->data)
		418	{
		419	int i;
		420	AV *av = (AV *)req->data;
		421
		422	EXTEND (SP, AvFILL (av) + 1);
		423	for (i = 0; i <= AvFILL (av); ++i)
		424	PUSHs (*av_fetch (av, i, 0));
		425	}
		426	break;
		427
		428	case REQ_NOP:
		429	case REQ_BUSY:
		430	break;
		431
		432	default:
		433	PUSHs (sv_2mortal (newSViv (req->result)));
		434	break;
		435	}
		436
		437	errno = req->errorno;
		438
		439	PUTBACK;
		440	call_sv (req->callback, G_VOID | G_EVAL);
		441	SPAGAIN;
		442
		443	FREETMPS;
		444	LEAVE;
		445	}
		446
		447	if (req->grp)
		448	{
		449	aio_req grp = req->grp;
		450
		451	/* unlink request */
		452	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		453	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		454
		455	if (grp->grp_first == req)
		456	grp->grp_first = req->grp_next;
		457
		458	aio_grp_dec (grp);
		459	}
		460
		461	if (SvTRUE (ERRSV))
		462	{
		463	req_free (req);
		464	croak (0);
		465	}
		466	}
		467
		468	static void req_free (aio_req req)
		469	{
		470	if (req->self)
		471	{
		472	sv_unmagic (req->self, PERL_MAGIC_ext);
		473	SvREFCNT_dec (req->self);
		474	}
		475
		476	SvREFCNT_dec (req->data);
		477	SvREFCNT_dec (req->fh);
		478	SvREFCNT_dec (req->fh2);
		479	SvREFCNT_dec (req->callback);
		480	Safefree (req->statdata);
		481
		482	if (req->type == REQ_READDIR)
		483	free (req->data2ptr);
		484
		485	Safefree (req);
		486	}
		487
		488	static void req_cancel_subs (aio_req grp)
		489	{
		490	aio_req sub;
		491
		492	if (grp->type != REQ_GROUP)
		493	return;
		494
		495	SvREFCNT_dec (grp->fh2);
		496	grp->fh2 = 0;
		497
		498	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		499	req_cancel (sub);
		500	}
		501
		502	static void req_cancel (aio_req req)
		503	{
		504	req->flags |= FLAG_CANCELLED;
		505
		506	req_cancel_subs (req);
		507	}
		508
		509	static int poll_cb (int max)
		510	{
		511	dSP;
		512	int count = 0;
		513	int do_croak = 0;
		514	aio_req req;
		515
		516	for (;;)
		517	{
		518	while (max <= 0 || count < max)
		519	{
		520	LOCK (reslock);
		521	req = reqq_shift (&res_queue);
		522
		523	if (req)
154	{	524	{
155	PUTBACK;	525	--npending;
156	call_sv (req->callback, G_VOID | G_EVAL);	526
157	SPAGAIN;	527	if (!res_queue.size)
		528	{
		529	/* read any signals sent by the worker threads */
		530	char buf [32];
		531	while (read (respipe [0], buf, 32) == 32)
		532	;
		533	}
158	}	534	}
159		535
160	LEAVE;	536	UNLOCK (reslock);
		537
		538	if (!req)
		539	break;
		540
		541	--nreqs;
		542
		543	if (req->type == REQ_QUIT)
		544	--started;
		545	else if (req->type == REQ_GROUP && req->length)
161		546	{
162	if (req->callback)	547	req->fd = 1; /* mark request as delayed */
163	SvREFCNT_dec (req->callback);	548	continue;
		549	}
		550	else
		551	{
		552	if (req->type == REQ_READ)
		553	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
164		554
165	errno = errorno;	555	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
		556	SvREADONLY_off (req->data);
		557
		558	if (req->statdata)
		559	{
		560	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		561	PL_laststatval = req->result;
		562	PL_statcache = *(req->statdata);
		563	}
		564
		565	req_invoke (req);
		566
166	count++;	567	count++;
		568	}
		569
		570	req_free (req);
167	}	571	}
168		572
169	prv = req;	573	if (nreqs <= max_outstanding)
170	req = req->next;	574	break;
171	Safefree (prv);
172		575
173	/* TODO: croak on errors? */	576	poll_wait ();
		577
		578	max = 0;
174	}	579	}
175		580
176	return count;	581	return count;
177	}	582	}
178		583
179	static void *aio_proc(void *arg);	584	static void *aio_proc(void *arg);
180		585
181	static void
182	start_thread (void)	586	static void start_thread (void)
183	{	587	{
184	sigset_t fullsigset, oldsigset;	588	sigset_t fullsigset, oldsigset;
185	pthread_t tid;
186	pthread_attr_t attr;	589	pthread_attr_t attr;
		590
		591	worker *wrk = calloc (1, sizeof (worker));
		592
		593	if (!wrk)
		594	croak ("unable to allocate worker thread data");
187		595
188	pthread_attr_init (&attr);	596	pthread_attr_init (&attr);
189	pthread_attr_setstacksize (&attr, STACKSIZE);	597	pthread_attr_setstacksize (&attr, STACKSIZE);
190	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);	598	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
191		599
192	sigfillset (&fullsigset);	600	sigfillset (&fullsigset);
		601
		602	LOCK (wrklock);
193	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	603	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
194		604
195	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)	605	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
		606	{
		607	wrk->prev = &wrk_first;
		608	wrk->next = wrk_first.next;
		609	wrk_first.next->prev = wrk;
		610	wrk_first.next = wrk;
196	started++;	611	++started;
		612	}
		613	else
		614	free (wrk);
197		615
198	sigprocmask (SIG_SETMASK, &oldsigset, 0);	616	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		617	UNLOCK (wrklock);
199	}	618	}
200		619
201	static void	620	static void req_send (aio_req req)
202	send_req (aio_req req)
203	{	621	{
		622	while (started < wanted && nreqs >= started)
		623	start_thread ();
		624
204	nreqs++;	625	++nreqs;
205		626
206	pthread_mutex_lock (&reqlock);	627	LOCK (reqlock);
207		628	++nready;
208	req->next = 0;	629	reqq_push (&req_queue, req);
209
210	if (reqe)
211	{
212	reqe->next = req;
213	reqe = req;
214	}
215	else
216	reqe = reqs = req;
217
218	pthread_cond_signal (&reqwait);	630	pthread_cond_signal (&reqwait);
219	pthread_mutex_unlock (&reqlock);	631	UNLOCK (reqlock);
		632	}
220		633
221	while (nreqs > max_outstanding)	634	static void end_thread (void)
		635	{
		636	aio_req req;
		637
		638	Newz (0, req, 1, aio_cb);
		639
		640	req->type = REQ_QUIT;
		641	req->pri = PRI_MAX + PRI_BIAS;
		642
		643	req_send (req);
		644	}
		645
		646	static void min_parallel (int nthreads)
		647	{
		648	if (wanted < nthreads)
		649	wanted = nthreads;
		650	}
		651
		652	static void max_parallel (int nthreads)
		653	{
		654	int cur = started;
		655
		656	if (wanted > nthreads)
		657	wanted = nthreads;
		658
		659	while (cur > wanted)
		660	{
		661	end_thread ();
		662	cur--;
		663	}
		664
		665	while (started > wanted)
222	{	666	{
223	poll_wait ();	667	poll_wait ();
224	poll_cb ();	668	poll_cb (0);
225	}	669	}
226	}	670	}
227		671
228	static void	672	static void create_pipe ()
229	end_thread (void)
230	{	673	{
231	aio_req req;	674	if (pipe (respipe))
232	New (0, req, 1, aio_cb);	675	croak ("unable to initialize result pipe");
233	req->type = REQ_QUIT;
234		676
235	send_req (req);	677	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
236	}	678	croak ("cannot set result pipe to nonblocking mode");
237		679
		680	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		681	croak ("cannot set result pipe to nonblocking mode");
		682	}
		683
		684	/*****************************************************************************/
238	/* work around various missing functions */	685	/* work around various missing functions */
239		686
240	#if !HAVE_PREADWRITE	687	#if !HAVE_PREADWRITE
241	# define pread aio_pread	688	# define pread aio_pread
242	# define pwrite aio_pwrite	689	# define pwrite aio_pwrite
…		…
244	/*	691	/*
245	* make our pread/pwrite safe against themselves, but not against	692	* make our pread/pwrite safe against themselves, but not against
246	* normal read/write by using a mutex. slows down execution a lot,	693	* normal read/write by using a mutex. slows down execution a lot,
247	* but that's your problem, not mine.	694	* but that's your problem, not mine.
248	*/	695	*/
249	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	696	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
250		697
251	static ssize_t	698	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
252	pread (int fd, void *buf, size_t count, off_t offset)
253	{	699	{
254	ssize_t res;	700	ssize_t res;
255	off_t ooffset;	701	off_t ooffset;
256		702
257	pthread_mutex_lock (&iolock);	703	LOCK (preadwritelock);
258	ooffset = lseek (fd, 0, SEEK_CUR);	704	ooffset = lseek (fd, 0, SEEK_CUR);
259	lseek (fd, offset, SEEK_SET);	705	lseek (fd, offset, SEEK_SET);
260	res = read (fd, buf, count);	706	res = read (fd, buf, count);
261	lseek (fd, ooffset, SEEK_SET);	707	lseek (fd, ooffset, SEEK_SET);
262	pthread_mutex_unlock (&iolock);	708	UNLOCK (preadwritelock);
263		709
264	return res;	710	return res;
265	}	711	}
266		712
267	static ssize_t
268	pwrite (int fd, void *buf, size_t count, off_t offset)	713	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
269	{	714	{
270	ssize_t res;	715	ssize_t res;
271	off_t ooffset;	716	off_t ooffset;
272		717
273	pthread_mutex_lock (&iolock);	718	LOCK (preadwritelock);
274	ooffset = lseek (fd, 0, SEEK_CUR);	719	ooffset = lseek (fd, 0, SEEK_CUR);
275	lseek (fd, offset, SEEK_SET);	720	lseek (fd, offset, SEEK_SET);
276	res = write (fd, buf, count);	721	res = write (fd, buf, count);
277	lseek (fd, offset, SEEK_SET);	722	lseek (fd, offset, SEEK_SET);
278	pthread_mutex_unlock (&iolock);	723	UNLOCK (preadwritelock);
279		724
280	return res;	725	return res;
281	}	726	}
282	#endif	727	#endif
283		728
284	#if !HAVE_FDATASYNC	729	#if !HAVE_FDATASYNC
285	# define fdatasync fsync	730	# define fdatasync fsync
286	#endif	731	#endif
287		732
288	#if !HAVE_READAHEAD	733	#if !HAVE_READAHEAD
289	# define readahead aio_readahead	734	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
290		735
291	static char readahead_buf[4096];	736	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
292
293	static ssize_t
294	readahead (int fd, off_t offset, size_t count)
295	{	737	{
		738	dBUF;
		739
296	while (count > 0)	740	while (count > 0)
297	{	741	{
298	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	742	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
299		743
300	pread (fd, readahead_buf, len, offset);	744	pread (fd, aio_buf, len, offset);
301	offset += len;	745	offset += len;
302	count -= len;	746	count -= len;
303	}	747	}
304		748
305	errno = 0;	749	errno = 0;
306	}	750	}
		751
307	#endif	752	#endif
308		753
309	static void *	754	#if !HAVE_READDIR_R
		755	# define readdir_r aio_readdir_r
		756
		757	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		758
		759	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		760	{
		761	struct dirent *e;
		762	int errorno;
		763
		764	LOCK (readdirlock);
		765
		766	e = readdir (dirp);
		767	errorno = errno;
		768
		769	if (e)
		770	{
		771	*res = ent;
		772	strcpy (ent->d_name, e->d_name);
		773	}
		774	else
		775	*res = 0;
		776
		777	UNLOCK (readdirlock);
		778
		779	errno = errorno;
		780	return e ? 0 : -1;
		781	}
		782	#endif
		783
		784	/* sendfile always needs emulation */
		785	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
		786	{
		787	ssize_t res;
		788
		789	if (!count)
		790	return 0;
		791
		792	#if HAVE_SENDFILE
		793	# if __linux
		794	res = sendfile (ofd, ifd, &offset, count);
		795
		796	# elif __freebsd
		797	/*
		798	* Of course, the freebsd sendfile is a dire hack with no thoughts
		799	* wasted on making it similar to other I/O functions.
		800	*/
		801	{
		802	off_t sbytes;
		803	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		804
		805	if (res < 0 && sbytes)
		806	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
		807	res = sbytes;
		808	}
		809
		810	# elif __hpux
		811	res = sendfile (ofd, ifd, offset, count, 0, 0);
		812
		813	# elif __solaris
		814	{
		815	struct sendfilevec vec;
		816	size_t sbytes;
		817
		818	vec.sfv_fd = ifd;
		819	vec.sfv_flag = 0;
		820	vec.sfv_off = offset;
		821	vec.sfv_len = count;
		822
		823	res = sendfilev (ofd, &vec, 1, &sbytes);
		824
		825	if (res < 0 && sbytes)
		826	res = sbytes;
		827	}
		828
		829	# endif
		830	#else
		831	res = -1;
		832	errno = ENOSYS;
		833	#endif
		834
		835	if (res < 0
		836	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		837	#if __solaris
		838	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		839	#endif
		840	)
		841	)
		842	{
		843	/* emulate sendfile. this is a major pain in the ass */
		844	dBUF;
		845
		846	res = 0;
		847
		848	while (count)
		849	{
		850	ssize_t cnt;
		851
		852	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
		853
		854	if (cnt <= 0)
		855	{
		856	if (cnt && !res) res = -1;
		857	break;
		858	}
		859
		860	cnt = write (ofd, aio_buf, cnt);
		861
		862	if (cnt <= 0)
		863	{
		864	if (cnt && !res) res = -1;
		865	break;
		866	}
		867
		868	offset += cnt;
		869	res += cnt;
		870	count -= cnt;
		871	}
		872	}
		873
		874	return res;
		875	}
		876
		877	/* read a full directory */
		878	static void scandir_ (aio_req req, worker *self)
		879	{
		880	DIR *dirp;
		881	union
		882	{
		883	struct dirent d;
		884	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		885	} *u;
		886	struct dirent *entp;
		887	char *name, *names;
		888	int memlen = 4096;
		889	int memofs = 0;
		890	int res = 0;
		891	int errorno;
		892
		893	LOCK (wrklock);
		894	self->dirp = dirp = opendir (req->dataptr);
		895	self->dbuf = u = malloc (sizeof (*u));
		896	req->data2ptr = names = malloc (memlen);
		897	UNLOCK (wrklock);
		898
		899	if (dirp && u && names)
		900	for (;;)
		901	{
		902	errno = 0;
		903	readdir_r (dirp, &u->d, &entp);
		904
		905	if (!entp)
		906	break;
		907
		908	name = entp->d_name;
		909
		910	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		911	{
		912	int len = strlen (name) + 1;
		913
		914	res++;
		915
		916	while (memofs + len > memlen)
		917	{
		918	memlen *= 2;
		919	LOCK (wrklock);
		920	req->data2ptr = names = realloc (names, memlen);
		921	UNLOCK (wrklock);
		922
		923	if (!names)
		924	break;
		925	}
		926
		927	memcpy (names + memofs, name, len);
		928	memofs += len;
		929	}
		930	}
		931
		932	if (errno)
		933	res = -1;
		934
		935	req->result = res;
		936	}
		937
		938	/*****************************************************************************/
		939
310	aio_proc (void *thr_arg)	940	static void *aio_proc (void *thr_arg)
311	{	941	{
312	aio_req req;	942	aio_req req;
313	int type;	943	int type;
		944	worker *self = (worker *)thr_arg;
314		945
315	do	946	do
316	{	947	{
317	pthread_mutex_lock (&reqlock);	948	LOCK (reqlock);
318		949
319	for (;;)	950	for (;;)
320	{	951	{
321	req = reqs;	952	self->req = req = reqq_shift (&req_queue);
322
323	if (reqs)
324	{
325	reqs = reqs->next;
326	if (!reqs) reqe = 0;
327	}
328		953
329	if (req)	954	if (req)
330	break;	955	break;
331		956
332	pthread_cond_wait (&reqwait, &reqlock);	957	pthread_cond_wait (&reqwait, &reqlock);
333	}	958	}
334		959
335	pthread_mutex_unlock (&reqlock);	960	--nready;
		961
		962	UNLOCK (reqlock);
336		963
337	errno = 0; /* strictly unnecessary */	964	errno = 0; /* strictly unnecessary */
		965	type = req->type; /* remember type for QUIT check */
338		966
339	type = req->type;	967	if (!(req->flags & FLAG_CANCELLED))
340
341	switch (type)	968	switch (type)
342	{	969	{
343	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	970	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
344	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	971	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
345		972
346	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	973	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
		974	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length, self); break;
347		975
348	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	976	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
349	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	977	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
350	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	978	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
351		979
352	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	980	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
353	case REQ_CLOSE: req->result = close (req->fd); break;	981	case REQ_CLOSE: req->result = close (req->fd); break;
354	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	982	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
		983	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		984	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		985	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
		986	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
355		987
356	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	988	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
357	case REQ_FSYNC: req->result = fsync (req->fd); break;	989	case REQ_FSYNC: req->result = fsync (req->fd); break;
		990	case REQ_READDIR: scandir_ (req, self); break;
358		991
		992	case REQ_BUSY:
		993	{
		994	struct timeval tv;
		995
		996	tv.tv_sec = req->fd;
		997	tv.tv_usec = req->fd2;
		998
		999	req->result = select (0, 0, 0, 0, &tv);
		1000	}
		1001
		1002	case REQ_GROUP:
		1003	case REQ_NOP:
359	case REQ_QUIT:	1004	case REQ_QUIT:
360	break;	1005	break;
361		1006
362	default:	1007	default:
363	req->result = ENOSYS;	1008	req->result = ENOSYS;
364	break;	1009	break;
365	}	1010	}
366		1011
367	req->errorno = errno;	1012	req->errorno = errno;
368		1013
369	pthread_mutex_lock (&reslock);	1014	LOCK (reslock);
370		1015
371	req->next = 0;	1016	++npending;
372		1017
373	if (rese)	1018	if (!reqq_push (&res_queue, req))
374	{
375	rese->next = req;
376	rese = req;
377	}
378	else
379	{
380	rese = ress = req;
381
382	/* write a dummy byte to the pipe so fh becomes ready */	1019	/* write a dummy byte to the pipe so fh becomes ready */
383	write (respipe [1], &respipe, 1);	1020	write (respipe [1], &respipe, 1);
384	}
385		1021
386	pthread_mutex_unlock (&reslock);	1022	self->req = 0;
		1023	worker_clear (self);
		1024
		1025	UNLOCK (reslock);
387	}	1026	}
388	while (type != REQ_QUIT);	1027	while (type != REQ_QUIT);
389		1028
		1029	LOCK (wrklock);
		1030	worker_free (self);
		1031	UNLOCK (wrklock);
		1032
390	return 0;	1033	return 0;
391	}	1034	}
392		1035
		1036	/*****************************************************************************/
		1037
		1038	static void atfork_prepare (void)
		1039	{
		1040	LOCK (wrklock);
		1041	LOCK (reqlock);
		1042	LOCK (reslock);
		1043	#if !HAVE_PREADWRITE
		1044	LOCK (preadwritelock);
		1045	#endif
		1046	#if !HAVE_READDIR_R
		1047	LOCK (readdirlock);
		1048	#endif
		1049	}
		1050
		1051	static void atfork_parent (void)
		1052	{
		1053	#if !HAVE_READDIR_R
		1054	UNLOCK (readdirlock);
		1055	#endif
		1056	#if !HAVE_PREADWRITE
		1057	UNLOCK (preadwritelock);
		1058	#endif
		1059	UNLOCK (reslock);
		1060	UNLOCK (reqlock);
		1061	UNLOCK (wrklock);
		1062	}
		1063
		1064	static void atfork_child (void)
		1065	{
		1066	aio_req prv;
		1067
		1068	while (prv = reqq_shift (&req_queue))
		1069	req_free (prv);
		1070
		1071	while (prv = reqq_shift (&res_queue))
		1072	req_free (prv);
		1073
		1074	while (wrk_first.next != &wrk_first)
		1075	{
		1076	worker *wrk = wrk_first.next;
		1077
		1078	if (wrk->req)
		1079	req_free (wrk->req);
		1080
		1081	worker_clear (wrk);
		1082	worker_free (wrk);
		1083	}
		1084
		1085	started = 0;
		1086	nreqs = 0;
		1087
		1088	close (respipe [0]);
		1089	close (respipe [1]);
		1090	create_pipe ();
		1091
		1092	atfork_parent ();
		1093	}
		1094
		1095	#define dREQ \
		1096	aio_req req; \
		1097	int req_pri = next_pri; \
		1098	next_pri = DEFAULT_PRI + PRI_BIAS; \
		1099	\
		1100	if (SvOK (callback) && !SvROK (callback)) \
		1101	croak ("callback must be undef or of reference type"); \
		1102	\
		1103	Newz (0, req, 1, aio_cb); \
		1104	if (!req) \
		1105	croak ("out of memory during aio_req allocation"); \
		1106	\
		1107	req->callback = newSVsv (callback); \
		1108	req->pri = req_pri
		1109
		1110	#define REQ_SEND \
		1111	req_send (req); \
		1112	\
		1113	if (GIMME_V != G_VOID) \
		1114	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		1115
393	MODULE = IO::AIO PACKAGE = IO::AIO	1116	MODULE = IO::AIO PACKAGE = IO::AIO
394		1117
395	PROTOTYPES: ENABLE	1118	PROTOTYPES: ENABLE
396		1119
397	BOOT:	1120	BOOT:
398	{	1121	{
399	if (pipe (respipe))	1122	HV *stash = gv_stashpv ("IO::AIO", 1);
400	croak ("unable to initialize result pipe");	1123	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		1124	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1125	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
401		1126
402	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	1127	create_pipe ();
403	croak ("cannot set result pipe to nonblocking mode");	1128	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
404
405	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
406	croak ("cannot set result pipe to nonblocking mode");
407	}	1129	}
408		1130
409	void	1131	void
410	min_parallel(nthreads)	1132	min_parallel (int nthreads)
411	int nthreads	1133	PROTOTYPE: $
		1134
		1135	void
		1136	max_parallel (int nthreads)
		1137	PROTOTYPE: $
		1138
		1139	int
		1140	max_outstanding (int maxreqs)
412	PROTOTYPE: $	1141	PROTOTYPE: $
413	CODE:	1142	CODE:
414	while (nthreads > started)
415	start_thread ();
416
417	void
418	max_parallel(nthreads)
419	int nthreads
420	PROTOTYPE: $
421	CODE:
422	{
423	int cur = started;
424	while (cur > nthreads)
425	{
426	end_thread ();
427	cur--;
428	}
429
430	while (started > nthreads)
431	{
432	poll_wait ();
433	poll_cb ();
434	}
435	}
436
437	int
438	max_outstanding(nreqs)
439	int nreqs
440	PROTOTYPE: $
441	CODE:
442	RETVAL = max_outstanding;	1143	RETVAL = max_outstanding;
443	max_outstanding = nreqs;	1144	max_outstanding = maxreqs;
		1145	OUTPUT:
		1146	RETVAL
444		1147
445	void	1148	void
446	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1149	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
447	SV * pathname	1150	SV * pathname
448	int flags	1151	int flags
449	int mode	1152	int mode
450	SV * callback	1153	SV * callback
451	PROTOTYPE: $$$;$	1154	PROTOTYPE: $$$;$
452	CODE:	1155	PPCODE:
453	{	1156	{
454	aio_req req;	1157	dREQ;
455
456	Newz (0, req, 1, aio_cb);
457
458	if (!req)
459	croak ("out of memory during aio_req allocation");
460		1158
461	req->type = REQ_OPEN;	1159	req->type = REQ_OPEN;
462	req->data = newSVsv (pathname);	1160	req->data = newSVsv (pathname);
463	req->dataptr = SvPV_nolen (req->data);	1161	req->dataptr = SvPVbyte_nolen (req->data);
464	req->fd = flags;	1162	req->fd = flags;
465	req->mode = mode;	1163	req->mode = mode;
466	req->callback = SvREFCNT_inc (callback);
467		1164
468	send_req (req);	1165	REQ_SEND;
469	}	1166	}
470		1167
471	void	1168	void
472	aio_close(fh,callback=&PL_sv_undef)	1169	aio_close (fh,callback=&PL_sv_undef)
473	SV * fh	1170	SV * fh
474	SV * callback	1171	SV * callback
475	PROTOTYPE: $;$	1172	PROTOTYPE: $;$
476	ALIAS:	1173	ALIAS:
477	aio_close = REQ_CLOSE	1174	aio_close = REQ_CLOSE
478	aio_fsync = REQ_FSYNC	1175	aio_fsync = REQ_FSYNC
479	aio_fdatasync = REQ_FDATASYNC	1176	aio_fdatasync = REQ_FDATASYNC
480	CODE:	1177	PPCODE:
481	{	1178	{
482	aio_req req;	1179	dREQ;
483
484	Newz (0, req, 1, aio_cb);
485
486	if (!req)
487	croak ("out of memory during aio_req allocation");
488		1180
489	req->type = ix;	1181	req->type = ix;
490	req->fh = newSVsv (fh);	1182	req->fh = newSVsv (fh);
491	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1183	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
492	req->callback = SvREFCNT_inc (callback);
493		1184
494	send_req (req);	1185	REQ_SEND (req);
495	}	1186	}
496		1187
497	void	1188	void
498	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1189	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
499	SV * fh	1190	SV * fh
500	UV offset	1191	UV offset
501	IV length	1192	UV length
502	SV * data	1193	SV * data
503	IV dataoffset	1194	UV dataoffset
504	SV * callback	1195	SV * callback
505	ALIAS:	1196	ALIAS:
506	aio_read = REQ_READ	1197	aio_read = REQ_READ
507	aio_write = REQ_WRITE	1198	aio_write = REQ_WRITE
508	PROTOTYPE: $$$$$;$	1199	PROTOTYPE: $$$$$;$
509	CODE:	1200	PPCODE:
510	{	1201	{
511	aio_req req;	1202	aio_req req;
512	STRLEN svlen;	1203	STRLEN svlen;
513	char *svptr = SvPVbyte (data, svlen);	1204	char *svptr = SvPVbyte (data, svlen);
514		1205
…		…
534	}	1225	}
535		1226
536	if (length < 0)	1227	if (length < 0)
537	croak ("length must not be negative");	1228	croak ("length must not be negative");
538		1229
539	Newz (0, req, 1, aio_cb);	1230	{
		1231	dREQ;
540		1232
541	if (!req)
542	croak ("out of memory during aio_req allocation");
543
544	req->type = ix;	1233	req->type = ix;
545	req->fh = newSVsv (fh);	1234	req->fh = newSVsv (fh);
546	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1235	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
547	: IoOFP (sv_2io (fh)));	1236	: IoOFP (sv_2io (fh)));
548	req->offset = offset;	1237	req->offset = offset;
		1238	req->length = length;
		1239	req->data = SvREFCNT_inc (data);
		1240	req->dataptr = (char *)svptr + dataoffset;
		1241
		1242	if (!SvREADONLY (data))
		1243	{
		1244	SvREADONLY_on (data);
		1245	req->data2ptr = (void *)data;
		1246	}
		1247
		1248	REQ_SEND;
		1249	}
		1250	}
		1251
		1252	void
		1253	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1254	SV * out_fh
		1255	SV * in_fh
		1256	UV in_offset
		1257	UV length
		1258	SV * callback
		1259	PROTOTYPE: $$$$;$
		1260	PPCODE:
		1261	{
		1262	dREQ;
		1263
		1264	req->type = REQ_SENDFILE;
		1265	req->fh = newSVsv (out_fh);
		1266	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1267	req->fh2 = newSVsv (in_fh);
		1268	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1269	req->offset = in_offset;
549	req->length = length;	1270	req->length = length;
550	req->data = SvREFCNT_inc (data);
551	req->dataptr = (char *)svptr + dataoffset;
552	req->callback = SvREFCNT_inc (callback);
553		1271
554	send_req (req);	1272	REQ_SEND;
555	}	1273	}
556		1274
557	void	1275	void
558	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1276	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
559	SV * fh	1277	SV * fh
560	UV offset	1278	UV offset
561	IV length	1279	IV length
562	SV * callback	1280	SV * callback
563	PROTOTYPE: $$$;$	1281	PROTOTYPE: $$$;$
564	CODE:	1282	PPCODE:
565	{	1283	{
566	aio_req req;	1284	dREQ;
567
568	if (length < 0)
569	croak ("length must not be negative");
570
571	Newz (0, req, 1, aio_cb);
572
573	if (!req)
574	croak ("out of memory during aio_req allocation");
575		1285
576	req->type = REQ_READAHEAD;	1286	req->type = REQ_READAHEAD;
577	req->fh = newSVsv (fh);	1287	req->fh = newSVsv (fh);
578	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1288	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
579	req->offset = offset;	1289	req->offset = offset;
580	req->length = length;	1290	req->length = length;
581	req->callback = SvREFCNT_inc (callback);
582		1291
583	send_req (req);	1292	REQ_SEND;
584	}	1293	}
585		1294
586	void	1295	void
587	aio_stat(fh_or_path,callback=&PL_sv_undef)	1296	aio_stat (fh_or_path,callback=&PL_sv_undef)
588	SV * fh_or_path	1297	SV * fh_or_path
589	SV * callback	1298	SV * callback
590	ALIAS:	1299	ALIAS:
591	aio_stat = REQ_STAT	1300	aio_stat = REQ_STAT
592	aio_lstat = REQ_LSTAT	1301	aio_lstat = REQ_LSTAT
593	CODE:	1302	PPCODE:
594	{	1303	{
595	aio_req req;	1304	dREQ;
596
597	Newz (0, req, 1, aio_cb);
598
599	if (!req)
600	croak ("out of memory during aio_req allocation");
601		1305
602	New (0, req->statdata, 1, Stat_t);	1306	New (0, req->statdata, 1, Stat_t);
603
604	if (!req->statdata)	1307	if (!req->statdata)
		1308	{
		1309	req_free (req);
605	croak ("out of memory during aio_req->statdata allocation");	1310	croak ("out of memory during aio_req->statdata allocation");
		1311	}
606		1312
607	if (SvPOK (fh_or_path))	1313	if (SvPOK (fh_or_path))
608	{	1314	{
609	req->type = ix;	1315	req->type = ix;
610	req->data = newSVsv (fh_or_path);	1316	req->data = newSVsv (fh_or_path);
611	req->dataptr = SvPV_nolen (req->data);	1317	req->dataptr = SvPVbyte_nolen (req->data);
612	}	1318	}
613	else	1319	else
614	{	1320	{
615	req->type = REQ_FSTAT;	1321	req->type = REQ_FSTAT;
616	req->fh = newSVsv (fh_or_path);	1322	req->fh = newSVsv (fh_or_path);
617	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1323	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
618	}	1324	}
619		1325
620	req->callback = SvREFCNT_inc (callback);	1326	REQ_SEND;
621
622	send_req (req);
623	}	1327	}
624		1328
625	void	1329	void
626	aio_unlink(pathname,callback=&PL_sv_undef)	1330	aio_unlink (pathname,callback=&PL_sv_undef)
627	SV * pathname	1331	SV * pathname
628	SV * callback	1332	SV * callback
		1333	ALIAS:
		1334	aio_unlink = REQ_UNLINK
		1335	aio_rmdir = REQ_RMDIR
		1336	aio_readdir = REQ_READDIR
		1337	PPCODE:
		1338	{
		1339	dREQ;
		1340
		1341	req->type = ix;
		1342	req->data = newSVsv (pathname);
		1343	req->dataptr = SvPVbyte_nolen (req->data);
		1344
		1345	REQ_SEND;
		1346	}
		1347
		1348	void
		1349	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1350	SV * oldpath
		1351	SV * newpath
		1352	SV * callback
		1353	ALIAS:
		1354	aio_link = REQ_LINK
		1355	aio_symlink = REQ_SYMLINK
		1356	aio_rename = REQ_RENAME
		1357	PPCODE:
		1358	{
		1359	dREQ;
		1360
		1361	req->type = ix;
		1362	req->fh = newSVsv (oldpath);
		1363	req->data2ptr = SvPVbyte_nolen (req->fh);
		1364	req->data = newSVsv (newpath);
		1365	req->dataptr = SvPVbyte_nolen (req->data);
		1366
		1367	REQ_SEND;
		1368	}
		1369
		1370	void
		1371	aio_busy (delay,callback=&PL_sv_undef)
		1372	double delay
		1373	SV * callback
		1374	PPCODE:
		1375	{
		1376	dREQ;
		1377
		1378	req->type = REQ_BUSY;
		1379	req->fd = delay < 0. ? 0 : delay;
		1380	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1381
		1382	REQ_SEND;
		1383	}
		1384
		1385	void
		1386	aio_group (callback=&PL_sv_undef)
		1387	SV * callback
		1388	PROTOTYPE: ;$
		1389	PPCODE:
		1390	{
		1391	dREQ;
		1392
		1393	req->type = REQ_GROUP;
		1394	req_send (req);
		1395
		1396	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1397	}
		1398
		1399	void
		1400	aio_nop (callback=&PL_sv_undef)
		1401	SV * callback
		1402	PPCODE:
		1403	{
		1404	dREQ;
		1405
		1406	req->type = REQ_NOP;
		1407
		1408	REQ_SEND;
		1409	}
		1410
		1411	int
		1412	aioreq_pri (int pri = 0)
		1413	PROTOTYPE: ;$
629	CODE:	1414	CODE:
630	{	1415	RETVAL = next_pri - PRI_BIAS;
631	aio_req req;	1416	if (items > 0)
632		1417	{
633	Newz (0, req, 1, aio_cb);	1418	if (pri < PRI_MIN) pri = PRI_MIN;
634		1419	if (pri > PRI_MAX) pri = PRI_MAX;
635	if (!req)	1420	next_pri = pri + PRI_BIAS;
636	croak ("out of memory during aio_req allocation");	1421	}
637		1422	OUTPUT:
638	req->type = REQ_UNLINK;	1423	RETVAL
639	req->data = newSVsv (pathname);
640	req->dataptr = SvPV_nolen (req->data);
641	req->callback = SvREFCNT_inc (callback);
642
643	send_req (req);
644	}
645		1424
646	void	1425	void
		1426	aioreq_nice (int nice = 0)
		1427	CODE:
		1428	nice = next_pri - nice;
		1429	if (nice < PRI_MIN) nice = PRI_MIN;
		1430	if (nice > PRI_MAX) nice = PRI_MAX;
		1431	next_pri = nice + PRI_BIAS;
		1432
		1433	void
647	flush()	1434	flush ()
648	PROTOTYPE:	1435	PROTOTYPE:
649	CODE:	1436	CODE:
650	while (nreqs)	1437	while (nreqs)
651	{	1438	{
652	poll_wait ();	1439	poll_wait ();
653	poll_cb ();	1440	poll_cb (0);
654	}	1441	}
655		1442
656	void	1443	void
657	poll()	1444	poll()
658	PROTOTYPE:	1445	PROTOTYPE:
659	CODE:	1446	CODE:
660	if (nreqs)	1447	if (nreqs)
661	{	1448	{
662	poll_wait ();	1449	poll_wait ();
663	poll_cb ();	1450	poll_cb (0);
664	}	1451	}
665		1452
666	int	1453	int
667	poll_fileno()	1454	poll_fileno()
668	PROTOTYPE:	1455	PROTOTYPE:
…		…
673		1460
674	int	1461	int
675	poll_cb(...)	1462	poll_cb(...)
676	PROTOTYPE:	1463	PROTOTYPE:
677	CODE:	1464	CODE:
678	RETVAL = poll_cb ();	1465	RETVAL = poll_cb (0);
		1466	OUTPUT:
		1467	RETVAL
		1468
		1469	int
		1470	poll_some(int max = 0)
		1471	PROTOTYPE: $
		1472	CODE:
		1473	RETVAL = poll_cb (max);
679	OUTPUT:	1474	OUTPUT:
680	RETVAL	1475	RETVAL
681		1476
682	void	1477	void
683	poll_wait()	1478	poll_wait()
…		…
692	CODE:	1487	CODE:
693	RETVAL = nreqs;	1488	RETVAL = nreqs;
694	OUTPUT:	1489	OUTPUT:
695	RETVAL	1490	RETVAL
696		1491
		1492	int
		1493	nready()
		1494	PROTOTYPE:
		1495	CODE:
		1496	if (WORDREAD_UNSAFE) LOCK (reqlock);
		1497	RETVAL = nready;
		1498	if (WORDREAD_UNSAFE) UNLOCK (reqlock);
		1499	OUTPUT:
		1500	RETVAL
		1501
		1502	int
		1503	npending()
		1504	PROTOTYPE:
		1505	CODE:
		1506	if (WORDREAD_UNSAFE) LOCK (reslock);
		1507	RETVAL = npending;
		1508	if (WORDREAD_UNSAFE) UNLOCK (reslock);
		1509	OUTPUT:
		1510	RETVAL
		1511
		1512	PROTOTYPES: DISABLE
		1513
		1514	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1515
		1516	void
		1517	cancel (aio_req_ornot req)
		1518	CODE:
		1519	req_cancel (req);
		1520
		1521	void
		1522	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1523	CODE:
		1524	SvREFCNT_dec (req->callback);
		1525	req->callback = newSVsv (callback);
		1526
		1527	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1528
		1529	void
		1530	add (aio_req grp, ...)
		1531	PPCODE:
		1532	{
		1533	int i;
		1534	aio_req req;
		1535
		1536	if (grp->fd == 2)
		1537	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1538
		1539	for (i = 1; i < items; ++i )
		1540	{
		1541	if (GIMME_V != G_VOID)
		1542	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1543
		1544	req = SvAIO_REQ (ST (i));
		1545
		1546	if (req)
		1547	{
		1548	++grp->length;
		1549	req->grp = grp;
		1550
		1551	req->grp_prev = 0;
		1552	req->grp_next = grp->grp_first;
		1553
		1554	if (grp->grp_first)
		1555	grp->grp_first->grp_prev = req;
		1556
		1557	grp->grp_first = req;
		1558	}
		1559	}
		1560	}
		1561
		1562	void
		1563	cancel_subs (aio_req_ornot req)
		1564	CODE:
		1565	req_cancel_subs (req);
		1566
		1567	void
		1568	result (aio_req grp, ...)
		1569	CODE:
		1570	{
		1571	int i;
		1572	AV *av;
		1573
		1574	grp->errorno = errno;
		1575
		1576	av = newAV ();
		1577
		1578	for (i = 1; i < items; ++i )
		1579	av_push (av, newSVsv (ST (i)));
		1580
		1581	SvREFCNT_dec (grp->data);
		1582	grp->data = (SV *)av;
		1583	}
		1584
		1585	void
		1586	errno (aio_req grp, int errorno = errno)
		1587	CODE:
		1588	grp->errorno = errorno;
		1589
		1590	void
		1591	limit (aio_req grp, int limit)
		1592	CODE:
		1593	grp->fd2 = limit;
		1594	aio_grp_feed (grp);
		1595
		1596	void
		1597	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1598	CODE:
		1599	{
		1600	SvREFCNT_dec (grp->fh2);
		1601	grp->fh2 = newSVsv (callback);
		1602
		1603	if (grp->fd2 <= 0)
		1604	grp->fd2 = 2;
		1605
		1606	aio_grp_feed (grp);
		1607	}
		1608

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