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

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