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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.2 by root, Sun Jul 10 18:16:49 2005 UTC vs.
Revision 1.84 by root, Sat Oct 28 01:24:19 2006 UTC

1	#define PERL_NO_GET_CONTEXT	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 */
		9	#define _REENTRANT 1
		10
		11	#include <errno.h>
2		12
3	#include "EXTERN.h"	13	#include "EXTERN.h"
4	#include "perl.h"	14	#include "perl.h"
5	#include "XSUB.h"	15	#include "XSUB.h"
6		16
		17	#include "autoconf/config.h"
		18
		19	#include <pthread.h>
		20
		21	#include <stddef.h>
		22	#include <errno.h>
		23	#include <sys/time.h>
		24	#include <sys/select.h>
7	#include <sys/types.h>	25	#include <sys/types.h>
8	#include <sys/stat.h>	26	#include <sys/stat.h>
		27	#include <limits.h>
9	#include <unistd.h>	28	#include <unistd.h>
10	#include <fcntl.h>	29	#include <fcntl.h>
11	#include <signal.h>	30	#include <signal.h>
12	#include <sched.h>	31	#include <sched.h>
13	#include <endian.h>
14		32
15	#include <pthread.h>	33	#if HAVE_SENDFILE
		34	# if __linux
		35	# include <sys/sendfile.h>
		36	# elif __freebsd
16	#include <sys/syscall.h>	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
17		47
18	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	48	/* number of seconds after which idle threads exit */
19	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	49	#define IDLE_TIMEOUT 10
20	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
21		50
22	#if __i386 || __amd64	51	/* used for struct dirent, AIX doesn't provide it */
23	# define STACKSIZE ( 256 * sizeof (long))	52	#ifndef NAME_MAX
		53	# define NAME_MAX 4096
		54	#endif
		55
		56	#ifndef PTHREAD_STACK_MIN
		57	/* care for broken platforms, e.g. windows */
		58	# define PTHREAD_STACK_MIN 16384
		59	#endif
		60
24	#elif __ia64	61	#if __ia64
25	# define STACKSIZE (8192 * sizeof (long))	62	# define STACKSIZE 65536
		63	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		64	# define STACKSIZE PTHREAD_STACK_MIN
26	#else	65	#else
27	# define STACKSIZE ( 512 * sizeof (long))	66	# define STACKSIZE 16384
		67	#endif
		68
		69	/* wether word reads are potentially non-atomic.
		70	* this is conservatice, likely most arches this runs
		71	* on have atomic word read/writes.
		72	*/
		73	#ifndef WORDREAD_UNSAFE
		74	# if __i386 || __x86_64
		75	# define WORDREAD_UNSAFE 0
		76	# else
		77	# define WORDREAD_UNSAFE 1
28	#endif	78	# endif
		79	#endif
		80
		81	/* buffer size for various temporary buffers */
		82	#define AIO_BUFSIZE 65536
		83
		84	#define dBUF \
		85	char *aio_buf; \
		86	LOCK (wrklock); \
		87	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		88	UNLOCK (wrklock); \
		89	if (!aio_buf) \
		90	return -1;
29		91
30	enum {	92	enum {
31	REQ_QUIT,	93	REQ_QUIT,
32	REQ_OPEN, REQ_CLOSE,	94	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,	95	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		96	REQ_SENDFILE,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	97	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35	REQ_FSYNC, REQ_FDATASYNC,	98	REQ_FSYNC, REQ_FDATASYNC,
		99	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
		100	REQ_MKNOD, REQ_READDIR,
		101	REQ_LINK, REQ_SYMLINK,
		102	REQ_GROUP, REQ_NOP,
		103	REQ_BUSY,
36	};	104	};
37		105
		106	#define AIO_REQ_KLASS "IO::AIO::REQ"
		107	#define AIO_GRP_KLASS "IO::AIO::GRP"
		108
38	typedef struct aio_cb {	109	typedef struct aio_cb
		110	{
39	struct aio_cb *next;	111	struct aio_cb *volatile next;
40		112
41	int type;	113	SV *data, *callback;
42		114	SV *fh, *fh2;
43	int fd;	115	void *dataptr, *data2ptr;
		116	Stat_t *statdata;
44	off_t offset;	117	off_t offset;
45	size_t length;	118	size_t length;
46	ssize_t result;	119	ssize_t result;
		120
		121	STRLEN dataoffset;
		122	int type;
		123	int fd, fd2;
		124	int errorno;
47	mode_t mode; /* open */	125	mode_t mode; /* open */
48	int errorno;
49	SV *data, *callback;
50	void *dataptr;
51	STRLEN dataoffset;
52		126
53	Stat_t *statdata;	127	unsigned char flags;
		128	unsigned char pri;
		129
		130	SV *self; /* the perl counterpart of this request, if any */
		131	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
54	} aio_cb;	132	} aio_cb;
55		133
		134	enum {
		135	FLAG_CANCELLED = 0x01,
		136	};
		137
56	typedef aio_cb *aio_req;	138	typedef aio_cb *aio_req;
		139	typedef aio_cb *aio_req_ornot;
57		140
58	static int started;	141	enum {
59	static int nreqs;	142	PRI_MIN = -4,
		143	PRI_MAX = 4,
		144
		145	DEFAULT_PRI = 0,
		146	PRI_BIAS = -PRI_MIN,
		147	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		148	};
		149
		150	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		151
		152	static unsigned int started, idle, wanted;
		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
		203	static volatile unsigned int nreqs, nready, npending;
		204	static volatile unsigned int max_idle = 4;
		205	static volatile unsigned int max_outstanding = 0xffffffff;
60	static int reqpipe[2], respipe[2];	206	static int respipe [2];
61		207
62	static aio_req qs, qe; /* queue start, queue end */	208	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
		209	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
		210	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
		211
		212	#if WORDREAD_UNSAFE
		213
		214	static unsigned int get_nready ()
		215	{
		216	unsigned int retval;
		217
		218	LOCK (reqlock);
		219	retval = nready;
		220	UNLOCK (reqlock);
		221
		222	return retval;
		223	}
		224
		225	static unsigned int get_npending ()
		226	{
		227	unsigned int retval;
		228
		229	LOCK (reslock);
		230	retval = npending;
		231	UNLOCK (reslock);
		232
		233	return retval;
		234	}
		235
		236	#else
		237
		238	# define get_nready() nready
		239	# define get_npending() npending
		240
		241	#endif
		242
		243	/*
		244	* a somewhat faster data structure might be nice, but
		245	* with 8 priorities this actually needs <20 insns
		246	* per shift, the most expensive operation.
		247	*/
		248	typedef struct {
		249	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		250	int size;
		251	} reqq;
		252
		253	static reqq req_queue;
		254	static reqq res_queue;
		255
		256	int reqq_push (reqq *q, aio_req req)
		257	{
		258	int pri = req->pri;
		259	req->next = 0;
		260
		261	if (q->qe[pri])
		262	{
		263	q->qe[pri]->next = req;
		264	q->qe[pri] = req;
		265	}
		266	else
		267	q->qe[pri] = q->qs[pri] = req;
		268
		269	return q->size++;
		270	}
		271
		272	aio_req reqq_shift (reqq *q)
		273	{
		274	int pri;
		275
		276	if (!q->size)
		277	return 0;
		278
		279	--q->size;
		280
		281	for (pri = NUM_PRI; pri--; )
		282	{
		283	aio_req req = q->qs[pri];
		284
		285	if (req)
		286	{
		287	if (!(q->qs[pri] = req->next))
		288	q->qe[pri] = 0;
		289
		290	return req;
		291	}
		292	}
		293
		294	abort ();
		295	}
		296
		297	static int poll_cb (int max);
		298	static void req_invoke (aio_req req);
		299	static void req_free (aio_req req);
		300	static void req_cancel (aio_req req);
		301
		302	/* must be called at most once */
		303	static SV *req_sv (aio_req req, const char *klass)
		304	{
		305	if (!req->self)
		306	{
		307	req->self = (SV *)newHV ();
		308	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		309	}
		310
		311	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		312	}
		313
		314	static aio_req SvAIO_REQ (SV *sv)
		315	{
		316	MAGIC *mg;
		317
		318	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		319	croak ("object of class " AIO_REQ_KLASS " expected");
		320
		321	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		322
		323	return mg ? (aio_req)mg->mg_ptr : 0;
		324	}
		325
		326	static void aio_grp_feed (aio_req grp)
		327	{
		328	while (grp->length < grp->fd2 && !(grp->flags & FLAG_CANCELLED))
		329	{
		330	int old_len = grp->length;
		331
		332	if (grp->fh2 && SvOK (grp->fh2))
		333	{
		334	dSP;
		335
		336	ENTER;
		337	SAVETMPS;
		338	PUSHMARK (SP);
		339	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		340	PUTBACK;
		341	call_sv (grp->fh2, G_VOID | G_EVAL | G_KEEPERR);
		342	SPAGAIN;
		343	FREETMPS;
		344	LEAVE;
		345	}
		346
		347	/* stop if no progress has been made */
		348	if (old_len == grp->length)
		349	{
		350	SvREFCNT_dec (grp->fh2);
		351	grp->fh2 = 0;
		352	break;
		353	}
		354	}
		355	}
		356
		357	static void aio_grp_dec (aio_req grp)
		358	{
		359	--grp->length;
		360
		361	/* call feeder, if applicable */
		362	aio_grp_feed (grp);
		363
		364	/* finish, if done */
		365	if (!grp->length && grp->fd)
		366	{
		367	req_invoke (grp);
		368	req_free (grp);
		369	}
		370	}
		371
		372	static void req_invoke (aio_req req)
		373	{
		374	dSP;
		375
		376	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		377	{
		378	ENTER;
		379	SAVETMPS;
		380	PUSHMARK (SP);
		381	EXTEND (SP, 1);
		382
		383	switch (req->type)
		384	{
		385	case REQ_READDIR:
		386	{
		387	SV *rv = &PL_sv_undef;
		388
		389	if (req->result >= 0)
		390	{
		391	int i;
		392	char *buf = req->data2ptr;
		393	AV *av = newAV ();
		394
		395	av_extend (av, req->result - 1);
		396
		397	for (i = 0; i < req->result; ++i)
		398	{
		399	SV *sv = newSVpv (buf, 0);
		400
		401	av_store (av, i, sv);
		402	buf += SvCUR (sv) + 1;
		403	}
		404
		405	rv = sv_2mortal (newRV_noinc ((SV *)av));
		406	}
		407
		408	PUSHs (rv);
		409	}
		410	break;
		411
		412	case REQ_OPEN:
		413	{
		414	/* convert fd to fh */
		415	SV *fh;
		416
		417	PUSHs (sv_2mortal (newSViv (req->result)));
		418	PUTBACK;
		419	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		420	SPAGAIN;
		421
		422	fh = SvREFCNT_inc (POPs);
		423
		424	PUSHMARK (SP);
		425	XPUSHs (sv_2mortal (fh));
		426	}
		427	break;
		428
		429	case REQ_GROUP:
		430	req->fd = 2; /* mark group as finished */
		431
		432	if (req->data)
		433	{
		434	int i;
		435	AV *av = (AV *)req->data;
		436
		437	EXTEND (SP, AvFILL (av) + 1);
		438	for (i = 0; i <= AvFILL (av); ++i)
		439	PUSHs (*av_fetch (av, i, 0));
		440	}
		441	break;
		442
		443	case REQ_NOP:
		444	case REQ_BUSY:
		445	break;
		446
		447	default:
		448	PUSHs (sv_2mortal (newSViv (req->result)));
		449	break;
		450	}
		451
		452	errno = req->errorno;
		453
		454	PUTBACK;
		455	call_sv (req->callback, G_VOID | G_EVAL);
		456	SPAGAIN;
		457
		458	FREETMPS;
		459	LEAVE;
		460	}
		461
		462	if (req->grp)
		463	{
		464	aio_req grp = req->grp;
		465
		466	/* unlink request */
		467	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		468	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		469
		470	if (grp->grp_first == req)
		471	grp->grp_first = req->grp_next;
		472
		473	aio_grp_dec (grp);
		474	}
		475
		476	if (SvTRUE (ERRSV))
		477	{
		478	req_free (req);
		479	croak (0);
		480	}
		481	}
		482
		483	static void req_free (aio_req req)
		484	{
		485	if (req->self)
		486	{
		487	sv_unmagic (req->self, PERL_MAGIC_ext);
		488	SvREFCNT_dec (req->self);
		489	}
		490
		491	SvREFCNT_dec (req->data);
		492	SvREFCNT_dec (req->fh);
		493	SvREFCNT_dec (req->fh2);
		494	SvREFCNT_dec (req->callback);
		495	Safefree (req->statdata);
		496
		497	if (req->type == REQ_READDIR)
		498	free (req->data2ptr);
		499
		500	Safefree (req);
		501	}
		502
		503	static void req_cancel_subs (aio_req grp)
		504	{
		505	aio_req sub;
		506
		507	if (grp->type != REQ_GROUP)
		508	return;
		509
		510	SvREFCNT_dec (grp->fh2);
		511	grp->fh2 = 0;
		512
		513	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		514	req_cancel (sub);
		515	}
		516
		517	static void req_cancel (aio_req req)
		518	{
		519	req->flags |= FLAG_CANCELLED;
		520
		521	req_cancel_subs (req);
		522	}
63		523
64	static void *aio_proc(void *arg);	524	static void *aio_proc(void *arg);
65		525
66	static void
67	start_thread (void)	526	static void start_thread (void)
68	{	527	{
69	sigset_t fullsigset, oldsigset;	528	sigset_t fullsigset, oldsigset;
70	pthread_t tid;
71	pthread_attr_t attr;	529	pthread_attr_t attr;
		530
		531	worker *wrk = calloc (1, sizeof (worker));
		532
		533	if (!wrk)
		534	croak ("unable to allocate worker thread data");
72		535
73	pthread_attr_init (&attr);	536	pthread_attr_init (&attr);
74	pthread_attr_setstacksize (&attr, STACKSIZE);	537	pthread_attr_setstacksize (&attr, STACKSIZE);
75	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);	538	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		539	#ifdef PTHREAD_SCOPE_PROCESS
		540	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		541	#endif
76		542
77	sigfillset (&fullsigset);	543	sigfillset (&fullsigset);
		544
		545	LOCK (wrklock);
78	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	546	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
79		547
80	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)	548	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
		549	{
		550	wrk->prev = &wrk_first;
		551	wrk->next = wrk_first.next;
		552	wrk_first.next->prev = wrk;
		553	wrk_first.next = wrk;
81	started++;	554	++started;
		555	}
		556	else
		557	free (wrk);
82		558
83	sigprocmask (SIG_SETMASK, &oldsigset, 0);	559	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		560	UNLOCK (wrklock);
84	}	561	}
85		562
86	static void	563	static void maybe_start_thread ()
87	send_reqs (void)
88	{	564	{
89	/* this write is atomic */	565	if (started >= wanted)
90	while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs)	566	return;
91	{	567
92	qs = qs->next;	568	/* todo: maybe use idle here, but might be less exact */
93	if (!qs) qe = 0;	569	if ((int)nready <= (int)started - (int)(nreqs - get_nready () - get_npending ()))
94	}	570	return;
95	}
96		571
97	static void	572	start_thread ();
98	send_req (aio_req req)	573	}
		574
		575	static void req_send (aio_req req)
99	{	576	{
100	nreqs++;	577	++nreqs;
101	req->next = 0;
102		578
103	if (qe)	579	LOCK (reqlock);
104	{	580	++nready;
105	qe->next = req;	581	reqq_push (&req_queue, req);
106	qe = req;	582	pthread_cond_signal (&reqwait);
107	}	583	UNLOCK (reqlock);
108	else
109	qe = qs = req;
110		584
111	send_reqs ();	585	maybe_start_thread ();
112	}	586	}
113		587
114	static void	588	static void end_thread (void)
115	end_thread (void)
116	{	589	{
117	aio_req req;	590	aio_req req;
		591
118	New (0, req, 1, aio_cb);	592	Newz (0, req, 1, aio_cb);
		593
119	req->type = REQ_QUIT;	594	req->type = REQ_QUIT;
		595	req->pri = PRI_MAX + PRI_BIAS;
120		596
121	send_req (req);	597	LOCK (reqlock);
122	}	598	reqq_push (&req_queue, req);
		599	pthread_cond_signal (&reqwait);
		600	UNLOCK (reqlock);
123		601
124	static void	602	LOCK (wrklock);
125	read_write (pTHX_	603	--started;
126	int dowrite, int fd, off_t offset, size_t length,	604	UNLOCK (wrklock);
127	SV *data, STRLEN dataoffset, SV *callback)
128	{
129	aio_req req;
130	STRLEN svlen;
131	char *svptr = SvPV (data, svlen);
132
133	SvUPGRADE (data, SVt_PV);
134	SvPOK_on (data);
135
136	if (dataoffset < 0)
137	dataoffset += svlen;
138
139	if (dataoffset < 0 || dataoffset > svlen)
140	croak ("data offset outside of string");
141
142	if (dowrite)
143	{
144	/* write: check length and adjust. */
145	if (length < 0 || length + dataoffset > svlen)
146	length = svlen - dataoffset;
147	}
148	else
149	{
150	/* read: grow scalar as necessary */
151	svptr = SvGROW (data, length + dataoffset);
152	}
153
154	if (length < 0)
155	croak ("length must not be negative");
156
157	Newz (0, req, 1, aio_cb);
158
159	if (!req)
160	croak ("out of memory during aio_req allocation");
161
162	req->type = dowrite ? REQ_WRITE : REQ_READ;
163	req->fd = fd;
164	req->offset = offset;
165	req->length = length;
166	req->data = SvREFCNT_inc (data);
167	req->dataptr = (char *)svptr + dataoffset;
168	req->callback = SvREFCNT_inc (callback);
169
170	send_req (req);
171	}	605	}
172		606
173	static void	607	static void min_parallel (int nthreads)
174	poll_wait ()	608	{
		609	if (wanted < nthreads)
		610	wanted = nthreads;
		611	}
		612
		613	static void max_parallel (int nthreads)
		614	{
		615	if (wanted > nthreads)
		616	wanted = nthreads;
		617
		618	while (started > wanted)
		619	end_thread ();
		620	}
		621
		622	static void poll_wait ()
175	{	623	{
176	fd_set rfd;	624	fd_set rfd;
		625
		626	while (nreqs)
		627	{
		628	int size;
		629	if (WORDREAD_UNSAFE) LOCK (reslock);
		630	size = res_queue.size;
		631	if (WORDREAD_UNSAFE) UNLOCK (reslock);
		632
		633	if (size)
		634	return;
		635
		636	maybe_start_thread ();
		637
177	FD_ZERO(&rfd);	638	FD_ZERO(&rfd);
178	FD_SET(respipe[0], &rfd);	639	FD_SET(respipe [0], &rfd);
179		640
180	select (respipe[0] + 1, &rfd, 0, 0, 0);	641	select (respipe [0] + 1, &rfd, 0, 0, 0);
		642	}
181	}	643	}
182		644
183	static int	645	static int poll_cb (int max)
184	poll_cb (pTHX)
185	{	646	{
186	dSP;	647	dSP;
187	int count = 0;	648	int count = 0;
		649	int do_croak = 0;
188	aio_req req;	650	aio_req req;
189		651
190	while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))	652	for (;;)
191	{	653	{
192	nreqs--;	654	while (max <= 0 || count < max)
193
194	if (req->type == REQ_QUIT)
195	started--;
196	else
197	{	655	{
198	int errorno = errno;	656	maybe_start_thread ();
199	errno = req->errorno;
200		657
201	if (req->type == REQ_READ)	658	LOCK (reslock);
202	SvCUR_set (req->data, req->dataoffset	659	req = reqq_shift (&res_queue);
203	+ req->result > 0 ? req->result : 0);
204		660
205	if (req->data)	661	if (req)
206	SvREFCNT_dec (req->data);
207
208	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
209	{	662	{
210	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	663	--npending;
211	PL_laststatval = req->result;
212	PL_statcache = *(req->statdata);
213		664
214	Safefree (req->statdata);	665	if (!res_queue.size)
		666	{
		667	/* read any signals sent by the worker threads */
		668	char buf [32];
		669	while (read (respipe [0], buf, 32) == 32)
		670	;
		671	}
215	}	672	}
216		673
217	PUSHMARK (SP);	674	UNLOCK (reslock);
218	XPUSHs (sv_2mortal (newSViv (req->result)));
219		675
		676	if (!req)
		677	break;
		678
		679	--nreqs;
		680
220	if (req->type == REQ_OPEN)	681	if (req->type == REQ_GROUP && req->length)
221	{	682	{
222	/* convert fd to fh */	683	req->fd = 1; /* mark request as delayed */
223	SV *fh;	684	continue;
224
225	PUTBACK;
226	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
227	SPAGAIN;
228
229	fh = POPs;
230
231	PUSHMARK (SP);
232	XPUSHs (fh);
233	}	685	}
		686	else
		687	{
		688	if (req->type == REQ_READ)
		689	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
234		690
235	PUTBACK;	691	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
236	call_sv (req->callback, G_VOID | G_EVAL);	692	SvREADONLY_off (req->data);
237	SPAGAIN;	693
		694	if (req->statdata)
		695	{
		696	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		697	PL_laststatval = req->result;
		698	PL_statcache = *(req->statdata);
		699	}
		700
		701	req_invoke (req);
		702
		703	count++;
		704	}
		705
		706	req_free (req);
		707	}
		708
		709	if (nreqs <= max_outstanding)
		710	break;
		711
		712	poll_wait ();
		713
		714	max = 0;
		715	}
		716
		717	return count;
		718	}
		719
		720	static void create_pipe ()
		721	{
		722	if (pipe (respipe))
		723	croak ("unable to initialize result pipe");
		724
		725	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
		726	croak ("cannot set result pipe to nonblocking mode");
		727
		728	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
		729	croak ("cannot set result pipe to nonblocking mode");
		730	}
		731
		732	/*****************************************************************************/
		733	/* work around various missing functions */
		734
		735	#if !HAVE_PREADWRITE
		736	# define pread aio_pread
		737	# define pwrite aio_pwrite
		738
		739	/*
		740	* make our pread/pwrite safe against themselves, but not against
		741	* normal read/write by using a mutex. slows down execution a lot,
		742	* but that's your problem, not mine.
		743	*/
		744	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
		745
		746	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
		747	{
		748	ssize_t res;
		749	off_t ooffset;
		750
		751	LOCK (preadwritelock);
		752	ooffset = lseek (fd, 0, SEEK_CUR);
		753	lseek (fd, offset, SEEK_SET);
		754	res = read (fd, buf, count);
		755	lseek (fd, ooffset, SEEK_SET);
		756	UNLOCK (preadwritelock);
		757
		758	return res;
		759	}
		760
		761	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
		762	{
		763	ssize_t res;
		764	off_t ooffset;
		765
		766	LOCK (preadwritelock);
		767	ooffset = lseek (fd, 0, SEEK_CUR);
		768	lseek (fd, offset, SEEK_SET);
		769	res = write (fd, buf, count);
		770	lseek (fd, offset, SEEK_SET);
		771	UNLOCK (preadwritelock);
		772
		773	return res;
		774	}
		775	#endif
		776
		777	#if !HAVE_FDATASYNC
		778	# define fdatasync fsync
		779	#endif
		780
		781	#if !HAVE_READAHEAD
		782	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
		783
		784	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
		785	{
		786	dBUF;
		787
		788	while (count > 0)
		789	{
		790	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
		791
		792	pread (fd, aio_buf, len, offset);
		793	offset += len;
		794	count -= len;
		795	}
		796
		797	errno = 0;
		798	}
		799
		800	#endif
		801
		802	#if !HAVE_READDIR_R
		803	# define readdir_r aio_readdir_r
		804
		805	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		806
		807	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		808	{
		809	struct dirent *e;
		810	int errorno;
		811
		812	LOCK (readdirlock);
		813
		814	e = readdir (dirp);
		815	errorno = errno;
		816
		817	if (e)
		818	{
		819	*res = ent;
		820	strcpy (ent->d_name, e->d_name);
		821	}
		822	else
		823	*res = 0;
		824
		825	UNLOCK (readdirlock);
		826
		827	errno = errorno;
		828	return e ? 0 : -1;
		829	}
		830	#endif
		831
		832	/* sendfile always needs emulation */
		833	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
		834	{
		835	ssize_t res;
		836
		837	if (!count)
		838	return 0;
		839
		840	#if HAVE_SENDFILE
		841	# if __linux
		842	res = sendfile (ofd, ifd, &offset, count);
		843
		844	# elif __freebsd
		845	/*
		846	* Of course, the freebsd sendfile is a dire hack with no thoughts
		847	* wasted on making it similar to other I/O functions.
		848	*/
		849	{
		850	off_t sbytes;
		851	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		852
		853	if (res < 0 && sbytes)
		854	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
		855	res = sbytes;
		856	}
		857
		858	# elif __hpux
		859	res = sendfile (ofd, ifd, offset, count, 0, 0);
		860
		861	# elif __solaris
		862	{
		863	struct sendfilevec vec;
		864	size_t sbytes;
		865
		866	vec.sfv_fd = ifd;
		867	vec.sfv_flag = 0;
		868	vec.sfv_off = offset;
		869	vec.sfv_len = count;
		870
		871	res = sendfilev (ofd, &vec, 1, &sbytes);
		872
		873	if (res < 0 && sbytes)
		874	res = sbytes;
		875	}
		876
		877	# endif
		878	#else
		879	res = -1;
		880	errno = ENOSYS;
		881	#endif
		882
		883	if (res < 0
		884	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		885	#if __solaris
		886	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		887	#endif
		888	)
		889	)
		890	{
		891	/* emulate sendfile. this is a major pain in the ass */
		892	dBUF;
		893
		894	res = 0;
		895
		896	while (count)
		897	{
		898	ssize_t cnt;
238		899
239	if (req->callback)	900	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
240	SvREFCNT_dec (req->callback);
241		901
242	errno = errorno;	902	if (cnt <= 0)
		903	{
		904	if (cnt && !res) res = -1;
		905	break;
		906	}
		907
		908	cnt = write (ofd, aio_buf, cnt);
		909
		910	if (cnt <= 0)
		911	{
		912	if (cnt && !res) res = -1;
		913	break;
		914	}
		915
		916	offset += cnt;
		917	res += cnt;
243	count++;	918	count -= cnt;
244	}	919	}
		920	}
245		921
246	Safefree (req);	922	return res;
		923	}
		924
		925	/* read a full directory */
		926	static void scandir_ (aio_req req, worker *self)
		927	{
		928	DIR *dirp;
		929	union
		930	{
		931	struct dirent d;
		932	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		933	} *u;
		934	struct dirent *entp;
		935	char *name, *names;
		936	int memlen = 4096;
		937	int memofs = 0;
		938	int res = 0;
		939	int errorno;
		940
		941	LOCK (wrklock);
		942	self->dirp = dirp = opendir (req->dataptr);
		943	self->dbuf = u = malloc (sizeof (*u));
		944	req->data2ptr = names = malloc (memlen);
		945	UNLOCK (wrklock);
		946
		947	if (dirp && u && names)
		948	for (;;)
		949	{
		950	errno = 0;
		951	readdir_r (dirp, &u->d, &entp);
		952
		953	if (!entp)
		954	break;
		955
		956	name = entp->d_name;
		957
		958	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		959	{
		960	int len = strlen (name) + 1;
		961
		962	res++;
		963
		964	while (memofs + len > memlen)
		965	{
		966	memlen *= 2;
		967	LOCK (wrklock);
		968	req->data2ptr = names = realloc (names, memlen);
		969	UNLOCK (wrklock);
		970
		971	if (!names)
		972	break;
		973	}
		974
		975	memcpy (names + memofs, name, len);
		976	memofs += len;
		977	}
247	}	978	}
248		979
249	if (qs)	980	if (errno)
250	send_reqs ();	981	res = -1;
251		982
252	return count;	983	req->result = res;
253	}	984	}
254		985
255	static void *	986	/*****************************************************************************/
		987
256	aio_proc (void *thr_arg)	988	static void *aio_proc (void *thr_arg)
257	{	989	{
258	aio_req req;	990	aio_req req;
		991	struct timespec ts;
		992	worker *self = (worker *)thr_arg;
259		993
260	/* then loop */	994	/* try to distribute timeouts somewhat evenly */
261	while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))	995	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		996	* (1000000000UL / 1024UL);
		997
		998	for (;;)
		999	{
		1000	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1001
		1002	LOCK (reqlock);
		1003
		1004	for (;;)
		1005	{
		1006	self->req = req = reqq_shift (&req_queue);
		1007
		1008	if (req)
		1009	break;
		1010
		1011	++idle;
		1012
		1013	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1014	== ETIMEDOUT)
		1015	{
		1016	if (idle > max_idle)
		1017	{
		1018	--idle;
		1019	UNLOCK (reqlock);
		1020	LOCK (wrklock);
		1021	--started;
		1022	UNLOCK (wrklock);
		1023	goto quit;
		1024	}
		1025
		1026	/* we are allowed to idle, so do so without any timeout */
		1027	pthread_cond_wait (&reqwait, &reqlock);
		1028	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1029	}
		1030
		1031	--idle;
		1032	}
		1033
		1034	--nready;
		1035
		1036	UNLOCK (reqlock);
262	{	1037
263	errno = 0; /* strictly unnecessary */	1038	errno = 0; /* strictly unnecessary */
264		1039
		1040	if (!(req->flags & FLAG_CANCELLED))
265	switch (req->type)	1041	switch (req->type)
266	{	1042	{
267	case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break;	1043	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
268	case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break;	1044	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
269	#if SYS_readahead	1045
270	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	1046	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
271	#else	1047	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length, self); break;
272	case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
273	#endif
274		1048
275	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1049	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
276	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1050	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
277	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1051	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
278		1052
279	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	1053	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
280	case REQ_CLOSE: req->result = close (req->fd); break;	1054	case REQ_CLOSE: req->result = close (req->fd); break;
281	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1055	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
282
283	case REQ_FSYNC: req->result = fsync (req->fd); break;	1056	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
		1057	case REQ_RENAME: req->result = rename (req->data2ptr, req->dataptr); break;
		1058	case REQ_LINK: req->result = link (req->data2ptr, req->dataptr); break;
		1059	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
		1060	case REQ_MKNOD: req->result = mknod (req->data2ptr, req->mode, (dev_t)req->offset); break;
		1061
284	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1062	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
		1063	case REQ_FSYNC: req->result = fsync (req->fd); break;
		1064	case REQ_READDIR: scandir_ (req, self); break;
285		1065
		1066	case REQ_BUSY:
		1067	{
		1068	struct timeval tv;
		1069
		1070	tv.tv_sec = req->fd;
		1071	tv.tv_usec = req->fd2;
		1072
		1073	req->result = select (0, 0, 0, 0, &tv);
		1074	}
		1075
		1076	case REQ_GROUP:
		1077	case REQ_NOP:
		1078	break;
		1079
286	case REQ_QUIT:	1080	case REQ_QUIT:
287	write (respipe[1], (void *)&req, sizeof (req));	1081	goto quit;
288	return 0;
289		1082
290	default:	1083	default:
291	req->result = ENOSYS;	1084	req->result = ENOSYS;
292	break;	1085	break;
293	}	1086	}
294		1087
295	req->errorno = errno;	1088	req->errorno = errno;
296	write (respipe[1], (void *)&req, sizeof (req));	1089
		1090	LOCK (reslock);
		1091
		1092	++npending;
		1093
		1094	if (!reqq_push (&res_queue, req))
		1095	/* write a dummy byte to the pipe so fh becomes ready */
		1096	write (respipe [1], &respipe, 1);
		1097
		1098	self->req = 0;
		1099	worker_clear (self);
		1100
		1101	UNLOCK (reslock);
297	}	1102	}
		1103
		1104	quit:
		1105	LOCK (wrklock);
		1106	worker_free (self);
		1107	UNLOCK (wrklock);
298		1108
299	return 0;	1109	return 0;
300	}	1110	}
301		1111
		1112	/*****************************************************************************/
		1113
		1114	static void atfork_prepare (void)
		1115	{
		1116	LOCK (wrklock);
		1117	LOCK (reqlock);
		1118	LOCK (reslock);
		1119	#if !HAVE_PREADWRITE
		1120	LOCK (preadwritelock);
		1121	#endif
		1122	#if !HAVE_READDIR_R
		1123	LOCK (readdirlock);
		1124	#endif
		1125	}
		1126
		1127	static void atfork_parent (void)
		1128	{
		1129	#if !HAVE_READDIR_R
		1130	UNLOCK (readdirlock);
		1131	#endif
		1132	#if !HAVE_PREADWRITE
		1133	UNLOCK (preadwritelock);
		1134	#endif
		1135	UNLOCK (reslock);
		1136	UNLOCK (reqlock);
		1137	UNLOCK (wrklock);
		1138	}
		1139
		1140	static void atfork_child (void)
		1141	{
		1142	aio_req prv;
		1143
		1144	while (prv = reqq_shift (&req_queue))
		1145	req_free (prv);
		1146
		1147	while (prv = reqq_shift (&res_queue))
		1148	req_free (prv);
		1149
		1150	while (wrk_first.next != &wrk_first)
		1151	{
		1152	worker *wrk = wrk_first.next;
		1153
		1154	if (wrk->req)
		1155	req_free (wrk->req);
		1156
		1157	worker_clear (wrk);
		1158	worker_free (wrk);
		1159	}
		1160
		1161	started = 0;
		1162	idle = 0;
		1163	nreqs = 0;
		1164	nready = 0;
		1165	npending = 0;
		1166
		1167	close (respipe [0]);
		1168	close (respipe [1]);
		1169	create_pipe ();
		1170
		1171	atfork_parent ();
		1172	}
		1173
		1174	#define dREQ \
		1175	aio_req req; \
		1176	int req_pri = next_pri; \
		1177	next_pri = DEFAULT_PRI + PRI_BIAS; \
		1178	\
		1179	if (SvOK (callback) && !SvROK (callback)) \
		1180	croak ("callback must be undef or of reference type"); \
		1181	\
		1182	Newz (0, req, 1, aio_cb); \
		1183	if (!req) \
		1184	croak ("out of memory during aio_req allocation"); \
		1185	\
		1186	req->callback = newSVsv (callback); \
		1187	req->pri = req_pri
		1188
		1189	#define REQ_SEND \
		1190	req_send (req); \
		1191	\
		1192	if (GIMME_V != G_VOID) \
		1193	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		1194
302	MODULE = IO::AIO PACKAGE = IO::AIO	1195	MODULE = IO::AIO PACKAGE = IO::AIO
303		1196
		1197	PROTOTYPES: ENABLE
		1198
304	BOOT:	1199	BOOT:
305	{	1200	{
306	if (pipe (reqpipe) || pipe (respipe))	1201	HV *stash = gv_stashpv ("IO::AIO", 1);
307	croak ("unable to initialize request or result pipe");
308		1202
309	if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK))	1203	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
310	croak ("cannot set result pipe to nonblocking mode");	1204	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1205	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1206	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1207	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1208	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
311		1209
312	if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))	1210	create_pipe ();
313	croak ("cannot set result pipe to nonblocking mode");	1211	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
314	}	1212	}
315		1213
316	void	1214	void
317	min_parallel(nthreads)	1215	min_parallel (int nthreads)
318	int nthreads	1216	PROTOTYPE: $
		1217
		1218	void
		1219	max_parallel (int nthreads)
		1220	PROTOTYPE: $
		1221
		1222	int
		1223	max_outstanding (int maxreqs)
319	PROTOTYPE: $	1224	PROTOTYPE: $
320	CODE:	1225	CODE:
321	while (nthreads > started)	1226	RETVAL = max_outstanding;
322	start_thread ();	1227	max_outstanding = maxreqs;
		1228	OUTPUT:
		1229	RETVAL
323		1230
324	void	1231	void
325	max_parallel(nthreads)
326	int nthreads
327	PROTOTYPE: $
328	CODE:
329	{
330	int cur = started;
331	while (cur > nthreads)
332	{
333	end_thread ();
334	cur--;
335	}
336
337	while (started > nthreads)
338	{
339	poll_wait ();
340	poll_cb (aTHX);
341	}
342	}
343
344	void
345	aio_open(pathname,flags,mode,callback)	1232	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
346	SV * pathname	1233	SV * pathname
347	int flags	1234	int flags
348	int mode	1235	int mode
349	SV * callback	1236	SV * callback
350	PROTOTYPE: $$$$	1237	PROTOTYPE: $$$;$
351	CODE:	1238	PPCODE:
352	{	1239	{
353	aio_req req;	1240	dREQ;
354
355	Newz (0, req, 1, aio_cb);
356
357	if (!req)
358	croak ("out of memory during aio_req allocation");
359		1241
360	req->type = REQ_OPEN;	1242	req->type = REQ_OPEN;
361	req->data = newSVsv (pathname);	1243	req->data = newSVsv (pathname);
362	req->dataptr = SvPV_nolen (req->data);	1244	req->dataptr = SvPVbyte_nolen (req->data);
363	req->fd = flags;	1245	req->fd = flags;
364	req->mode = mode;	1246	req->mode = mode;
365	req->callback = SvREFCNT_inc (callback);
366		1247
367	send_req (req);	1248	REQ_SEND;
368	}	1249	}
369		1250
370	void	1251	void
371	aio_close(fh,callback)	1252	aio_close (fh,callback=&PL_sv_undef)
372	InputStream fh	1253	SV * fh
373	SV * callback	1254	SV * callback
374	PROTOTYPE: $$	1255	PROTOTYPE: $;$
375	ALIAS:	1256	ALIAS:
376	aio_close = REQ_CLOSE	1257	aio_close = REQ_CLOSE
377	aio_fsync = REQ_FSYNC	1258	aio_fsync = REQ_FSYNC
378	aio_fdatasync = REQ_FDATASYNC	1259	aio_fdatasync = REQ_FDATASYNC
379	CODE:	1260	PPCODE:
		1261	{
		1262	dREQ;
		1263
		1264	req->type = ix;
		1265	req->fh = newSVsv (fh);
		1266	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
		1267
		1268	REQ_SEND (req);
		1269	}
		1270
		1271	void
		1272	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
		1273	SV * fh
		1274	UV offset
		1275	UV length
		1276	SV * data
		1277	UV dataoffset
		1278	SV * callback
		1279	ALIAS:
		1280	aio_read = REQ_READ
		1281	aio_write = REQ_WRITE
		1282	PROTOTYPE: $$$$$;$
		1283	PPCODE:
380	{	1284	{
381	aio_req req;	1285	aio_req req;
		1286	STRLEN svlen;
		1287	char *svptr = SvPVbyte (data, svlen);
382		1288
383	Newz (0, req, 1, aio_cb);	1289	SvUPGRADE (data, SVt_PV);
		1290	SvPOK_on (data);
384		1291
385	if (!req)	1292	if (dataoffset < 0)
386	croak ("out of memory during aio_req allocation");	1293	dataoffset += svlen;
387		1294
388	req->type = ix;	1295	if (dataoffset < 0 || dataoffset > svlen)
389	req->fd = PerlIO_fileno (fh);	1296	croak ("data offset outside of string");
390	req->callback = SvREFCNT_inc (callback);
391		1297
392	send_req (req);	1298	if (ix == REQ_WRITE)
393	}	1299	{
394		1300	/* write: check length and adjust. */
395	void	1301	if (length < 0 || length + dataoffset > svlen)
396	aio_read(fh,offset,length,data,dataoffset,callback)	1302	length = svlen - dataoffset;
397	InputStream fh	1303	}
398	UV offset	1304	else
399	IV length	1305	{
400	SV * data	1306	/* read: grow scalar as necessary */
401	IV dataoffset	1307	svptr = SvGROW (data, length + dataoffset);
402	SV * callback	1308	}
403	PROTOTYPE: $$$$$$
404	CODE:
405	read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
406
407	void
408	aio_write(fh,offset,length,data,dataoffset,callback)
409	OutputStream fh
410	UV offset
411	IV length
412	SV * data
413	IV dataoffset
414	SV * callback
415	PROTOTYPE: $$$$$$
416	CODE:
417	read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
418
419	void
420	aio_readahead(fh,offset,length,callback)
421	InputStream fh
422	UV offset
423	IV length
424	SV * callback
425	PROTOTYPE: $$$$
426	CODE:
427	{
428	aio_req req;
429		1309
430	if (length < 0)	1310	if (length < 0)
431	croak ("length must not be negative");	1311	croak ("length must not be negative");
432		1312
433	Newz (0, req, 1, aio_cb);	1313	{
		1314	dREQ;
434		1315
435	if (!req)	1316	req->type = ix;
436	croak ("out of memory during aio_req allocation");	1317	req->fh = newSVsv (fh);
		1318	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
		1319	: IoOFP (sv_2io (fh)));
		1320	req->offset = offset;
		1321	req->length = length;
		1322	req->data = SvREFCNT_inc (data);
		1323	req->dataptr = (char *)svptr + dataoffset;
		1324
		1325	if (!SvREADONLY (data))
		1326	{
		1327	SvREADONLY_on (data);
		1328	req->data2ptr = (void *)data;
		1329	}
		1330
		1331	REQ_SEND;
		1332	}
		1333	}
		1334
		1335	void
		1336	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1337	SV * out_fh
		1338	SV * in_fh
		1339	UV in_offset
		1340	UV length
		1341	SV * callback
		1342	PROTOTYPE: $$$$;$
		1343	PPCODE:
		1344	{
		1345	dREQ;
		1346
		1347	req->type = REQ_SENDFILE;
		1348	req->fh = newSVsv (out_fh);
		1349	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1350	req->fh2 = newSVsv (in_fh);
		1351	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1352	req->offset = in_offset;
		1353	req->length = length;
		1354
		1355	REQ_SEND;
		1356	}
		1357
		1358	void
		1359	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
		1360	SV * fh
		1361	UV offset
		1362	IV length
		1363	SV * callback
		1364	PROTOTYPE: $$$;$
		1365	PPCODE:
		1366	{
		1367	dREQ;
437		1368
438	req->type = REQ_READAHEAD;	1369	req->type = REQ_READAHEAD;
		1370	req->fh = newSVsv (fh);
439	req->fd = PerlIO_fileno (fh);	1371	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));
440	req->offset = offset;	1372	req->offset = offset;
441	req->length = length;	1373	req->length = length;
442	req->callback = SvREFCNT_inc (callback);
443		1374
444	send_req (req);	1375	REQ_SEND;
445	}	1376	}
446		1377
447	void	1378	void
448	aio_stat(fh_or_path,callback)	1379	aio_stat (fh_or_path,callback=&PL_sv_undef)
449	SV * fh_or_path	1380	SV * fh_or_path
450	SV * callback	1381	SV * callback
451	PROTOTYPE: $$
452	ALIAS:	1382	ALIAS:
		1383	aio_stat = REQ_STAT
453	aio_lstat = 1	1384	aio_lstat = REQ_LSTAT
454	CODE:	1385	PPCODE:
455	{	1386	{
456	aio_req req;	1387	dREQ;
457
458	Newz (0, req, 1, aio_cb);
459
460	if (!req)
461	croak ("out of memory during aio_req allocation");
462		1388
463	New (0, req->statdata, 1, Stat_t);	1389	New (0, req->statdata, 1, Stat_t);
464
465	if (!req->statdata)	1390	if (!req->statdata)
		1391	{
		1392	req_free (req);
466	croak ("out of memory during aio_req->statdata allocation");	1393	croak ("out of memory during aio_req->statdata allocation");
		1394	}
467		1395
468	if (SvPOK (fh_or_path))	1396	if (SvPOK (fh_or_path))
469	{	1397	{
470	req->type = ix ? REQ_LSTAT : REQ_STAT;	1398	req->type = ix;
471	req->data = newSVsv (fh_or_path);	1399	req->data = newSVsv (fh_or_path);
472	req->dataptr = SvPV_nolen (req->data);	1400	req->dataptr = SvPVbyte_nolen (req->data);
473	}	1401	}
474	else	1402	else
475	{	1403	{
476	req->type = REQ_FSTAT;	1404	req->type = REQ_FSTAT;
		1405	req->fh = newSVsv (fh_or_path);
477	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1406	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
478	}	1407	}
479		1408
480	req->callback = SvREFCNT_inc (callback);	1409	REQ_SEND;
481
482	send_req (req);
483	}	1410	}
484		1411
485	void	1412	void
486	aio_unlink(pathname,callback)	1413	aio_unlink (pathname,callback=&PL_sv_undef)
487	SV * pathname	1414	SV * pathname
488	SV * callback	1415	SV * callback
		1416	ALIAS:
		1417	aio_unlink = REQ_UNLINK
		1418	aio_rmdir = REQ_RMDIR
		1419	aio_readdir = REQ_READDIR
		1420	PPCODE:
		1421	{
		1422	dREQ;
		1423
		1424	req->type = ix;
		1425	req->data = newSVsv (pathname);
		1426	req->dataptr = SvPVbyte_nolen (req->data);
		1427
		1428	REQ_SEND;
		1429	}
		1430
		1431	void
		1432	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1433	SV * oldpath
		1434	SV * newpath
		1435	SV * callback
		1436	ALIAS:
		1437	aio_link = REQ_LINK
		1438	aio_symlink = REQ_SYMLINK
		1439	aio_rename = REQ_RENAME
		1440	PPCODE:
		1441	{
		1442	dREQ;
		1443
		1444	req->type = ix;
		1445	req->fh = newSVsv (oldpath);
		1446	req->data2ptr = SvPVbyte_nolen (req->fh);
		1447	req->data = newSVsv (newpath);
		1448	req->dataptr = SvPVbyte_nolen (req->data);
		1449
		1450	REQ_SEND;
		1451	}
		1452
		1453	void
		1454	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
		1455	SV * pathname
		1456	SV * callback
		1457	UV mode
		1458	UV dev
		1459	PPCODE:
		1460	{
		1461	dREQ;
		1462
		1463	req->type = REQ_MKNOD;
		1464	req->data = newSVsv (pathname);
		1465	req->dataptr = SvPVbyte_nolen (req->data);
		1466	req->mode = (mode_t)mode;
		1467	req->offset = dev;
		1468
		1469	REQ_SEND;
		1470	}
		1471
		1472	void
		1473	aio_busy (delay,callback=&PL_sv_undef)
		1474	double delay
		1475	SV * callback
		1476	PPCODE:
		1477	{
		1478	dREQ;
		1479
		1480	req->type = REQ_BUSY;
		1481	req->fd = delay < 0. ? 0 : delay;
		1482	req->fd2 = delay < 0. ? 0 : 1000. * (delay - req->fd);
		1483
		1484	REQ_SEND;
		1485	}
		1486
		1487	void
		1488	aio_group (callback=&PL_sv_undef)
		1489	SV * callback
489	PROTOTYPE: $$	1490	PROTOTYPE: ;$
		1491	PPCODE:
		1492	{
		1493	dREQ;
		1494
		1495	req->type = REQ_GROUP;
		1496	req_send (req);
		1497
		1498	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1499	}
		1500
		1501	void
		1502	aio_nop (callback=&PL_sv_undef)
		1503	SV * callback
		1504	PPCODE:
		1505	{
		1506	dREQ;
		1507
		1508	req->type = REQ_NOP;
		1509
		1510	REQ_SEND;
		1511	}
		1512
		1513	int
		1514	aioreq_pri (int pri = 0)
		1515	PROTOTYPE: ;$
490	CODE:	1516	CODE:
491	{	1517	RETVAL = next_pri - PRI_BIAS;
492	aio_req req;	1518	if (items > 0)
493		1519	{
494	Newz (0, req, 1, aio_cb);	1520	if (pri < PRI_MIN) pri = PRI_MIN;
495		1521	if (pri > PRI_MAX) pri = PRI_MAX;
496	if (!req)	1522	next_pri = pri + PRI_BIAS;
497	croak ("out of memory during aio_req allocation");	1523	}
498		1524	OUTPUT:
499	req->type = REQ_UNLINK;	1525	RETVAL
500	req->data = newSVsv (pathname);	1526
501	req->dataptr = SvPV_nolen (req->data);	1527	void
502	req->callback = SvREFCNT_inc (callback);	1528	aioreq_nice (int nice = 0)
503		1529	CODE:
504	send_req (req);	1530	nice = next_pri - nice;
505	}	1531	if (nice < PRI_MIN) nice = PRI_MIN;
		1532	if (nice > PRI_MAX) nice = PRI_MAX;
		1533	next_pri = nice + PRI_BIAS;
		1534
		1535	void
		1536	flush ()
		1537	PROTOTYPE:
		1538	CODE:
		1539	while (nreqs)
		1540	{
		1541	poll_wait ();
		1542	poll_cb (0);
		1543	}
		1544
		1545	void
		1546	poll()
		1547	PROTOTYPE:
		1548	CODE:
		1549	if (nreqs)
		1550	{
		1551	poll_wait ();
		1552	poll_cb (0);
		1553	}
506		1554
507	int	1555	int
508	poll_fileno()	1556	poll_fileno()
509	PROTOTYPE:	1557	PROTOTYPE:
510	CODE:	1558	CODE:
511	RETVAL = respipe[0];	1559	RETVAL = respipe [0];
512	OUTPUT:	1560	OUTPUT:
513	RETVAL	1561	RETVAL
514		1562
515	int	1563	int
516	poll_cb(...)	1564	poll_cb(...)
517	PROTOTYPE:	1565	PROTOTYPE:
518	CODE:	1566	CODE:
		1567	RETVAL = poll_cb (0);
		1568	OUTPUT:
		1569	RETVAL
		1570
		1571	int
		1572	poll_some(int max = 0)
		1573	PROTOTYPE: $
		1574	CODE:
519	RETVAL = poll_cb (aTHX);	1575	RETVAL = poll_cb (max);
520	OUTPUT:	1576	OUTPUT:
521	RETVAL	1577	RETVAL
522		1578
523	void	1579	void
524	poll_wait()	1580	poll_wait()
525	PROTOTYPE:	1581	PROTOTYPE:
526	CODE:	1582	CODE:
		1583	if (nreqs)
527	poll_wait ();	1584	poll_wait ();
528		1585
529	int	1586	int
530	nreqs()	1587	nreqs()
531	PROTOTYPE:	1588	PROTOTYPE:
532	CODE:	1589	CODE:
533	RETVAL = nreqs;	1590	RETVAL = nreqs;
534	OUTPUT:	1591	OUTPUT:
535	RETVAL	1592	RETVAL
536		1593
		1594	int
		1595	nready()
		1596	PROTOTYPE:
		1597	CODE:
		1598	RETVAL = get_nready ();
		1599	OUTPUT:
		1600	RETVAL
		1601
		1602	int
		1603	npending()
		1604	PROTOTYPE:
		1605	CODE:
		1606	RETVAL = get_npending ();
		1607	OUTPUT:
		1608	RETVAL
		1609
		1610	PROTOTYPES: DISABLE
		1611
		1612	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1613
		1614	void
		1615	cancel (aio_req_ornot req)
		1616	CODE:
		1617	req_cancel (req);
		1618
		1619	void
		1620	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1621	CODE:
		1622	SvREFCNT_dec (req->callback);
		1623	req->callback = newSVsv (callback);
		1624
		1625	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1626
		1627	void
		1628	add (aio_req grp, ...)
		1629	PPCODE:
		1630	{
		1631	int i;
		1632	aio_req req;
		1633
		1634	if (grp->fd == 2)
		1635	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1636
		1637	for (i = 1; i < items; ++i )
		1638	{
		1639	if (GIMME_V != G_VOID)
		1640	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1641
		1642	req = SvAIO_REQ (ST (i));
		1643
		1644	if (req)
		1645	{
		1646	++grp->length;
		1647	req->grp = grp;
		1648
		1649	req->grp_prev = 0;
		1650	req->grp_next = grp->grp_first;
		1651
		1652	if (grp->grp_first)
		1653	grp->grp_first->grp_prev = req;
		1654
		1655	grp->grp_first = req;
		1656	}
		1657	}
		1658	}
		1659
		1660	void
		1661	cancel_subs (aio_req_ornot req)
		1662	CODE:
		1663	req_cancel_subs (req);
		1664
		1665	void
		1666	result (aio_req grp, ...)
		1667	CODE:
		1668	{
		1669	int i;
		1670	AV *av;
		1671
		1672	grp->errorno = errno;
		1673
		1674	av = newAV ();
		1675
		1676	for (i = 1; i < items; ++i )
		1677	av_push (av, newSVsv (ST (i)));
		1678
		1679	SvREFCNT_dec (grp->data);
		1680	grp->data = (SV *)av;
		1681	}
		1682
		1683	void
		1684	errno (aio_req grp, int errorno = errno)
		1685	CODE:
		1686	grp->errorno = errorno;
		1687
		1688	void
		1689	limit (aio_req grp, int limit)
		1690	CODE:
		1691	grp->fd2 = limit;
		1692	aio_grp_feed (grp);
		1693
		1694	void
		1695	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1696	CODE:
		1697	{
		1698	SvREFCNT_dec (grp->fh2);
		1699	grp->fh2 = newSVsv (callback);
		1700
		1701	if (grp->fd2 <= 0)
		1702	grp->fd2 = 2;
		1703
		1704	aio_grp_feed (grp);
		1705	}
		1706

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