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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.1 by root, Sun Jul 10 17:07:44 2005 UTC vs.
Revision 1.43 by root, Sat Oct 21 23:06:04 2006 UTC

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

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