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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.18 by root, Sun Jul 31 19:00:31 2005 UTC vs.
Revision 1.103 by root, Sun Jul 8 09:09:34 2007 UTC

		1	#include "xthread.h"
		2
		3	#include <errno.h>
		4
1	#include "EXTERN.h"	5	#include "EXTERN.h"
2	#include "perl.h"	6	#include "perl.h"
3	#include "XSUB.h"	7	#include "XSUB.h"
4		8
5	#include "autoconf/config.h"	9	#include <stddef.h>
6		10	#include <stdlib.h>
		11	#include <errno.h>
7	#include <sys/types.h>	12	#include <sys/types.h>
8	#include <sys/stat.h>	13	#include <sys/stat.h>
9
10	#include <unistd.h>	14	#include <limits.h>
11	#include <fcntl.h>	15	#include <fcntl.h>
12	#include <signal.h>
13	#include <sched.h>	16	#include <sched.h>
14		17
15	#ifndef _REENTRANT	18	#ifdef _WIN32
16	# define _REENTRANT 1	19
		20	# define SIGIO 0
		21	typedef Direntry_t X_DIRENT;
		22	#undef malloc
		23	#undef free
		24
		25	// perl overrides all those nice win32 functions
		26	# undef open
		27	# undef read
		28	# undef write
		29	# undef stat
		30	# undef fstat
		31	# define lstat stat
		32	# undef truncate
		33	# undef ftruncate
		34	# undef open
		35	# undef close
		36	# undef unlink
		37	# undef rmdir
		38	# undef rename
		39	# undef lseek
		40
		41	# define chown(a,b,c) (errno = ENOSYS, -1)
		42	# define fchown(a,b,c) (errno = ENOSYS, -1)
		43	# define fchmod(a,b) (errno = ENOSYS, -1)
		44	# define symlink(a,b) (errno = ENOSYS, -1)
		45	# define readlink(a,b,c) (errno = ENOSYS, -1)
		46	# define mknod(a,b,c) (errno = ENOSYS, -1)
		47	# define truncate(a,b) (errno = ENOSYS, -1)
		48	# define ftruncate(fd,o) chsize ((fd), (o))
		49	# define fsync(fd) _commit (fd)
		50	# define opendir(fd) (errno = ENOSYS, 0)
		51	# define readdir(fd) (errno = ENOSYS, -1)
		52	# define closedir(fd) (errno = ENOSYS, -1)
		53	# define mkdir(a,b) mkdir (a)
		54
		55	#else
		56
		57	# include "autoconf/config.h"
		58	# include <sys/time.h>
		59	# include <sys/select.h>
		60	# include <unistd.h>
		61	# include <utime.h>
		62	# include <signal.h>
		63	typedef struct dirent X_DIRENT;
		64
17	#endif	65	#endif
18	#include <errno.h>
19		66
20	#include <pthread.h>	67	#if HAVE_SENDFILE
		68	# if __linux
		69	# include <sys/sendfile.h>
		70	# elif __freebsd
		71	# include <sys/socket.h>
		72	# include <sys/uio.h>
		73	# elif __hpux
		74	# include <sys/socket.h>
		75	# elif __solaris /* not yet */
		76	# include <sys/sendfile.h>
		77	# else
		78	# error sendfile support requested but not available
		79	# endif
		80	#endif
21		81
22	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	82	/* number of seconds after which idle threads exit */
23	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	83	#define IDLE_TIMEOUT 10
24	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */
25		84
26	#if __ia64	85	/* used for struct dirent, AIX doesn't provide it */
		86	#ifndef NAME_MAX
		87	# define NAME_MAX 4096
		88	#endif
		89
		90	/* buffer size for various temporary buffers */
27	# define STACKSIZE 65536	91	#define AIO_BUFSIZE 65536
		92
		93	/* use NV for 32 bit perls as it allows larger offsets */
		94	#if IVSIZE >= 8
		95	# define SvVAL64 SvIV
28	#else	96	#else
29	# define STACKSIZE 4096	97	# define SvVAL64 SvNV
30	#endif	98	#endif
		99
		100	#define dBUF \
		101	char *aio_buf; \
		102	X_LOCK (wrklock); \
		103	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		104	X_UNLOCK (wrklock); \
		105	if (!aio_buf) \
		106	return -1;
		107
		108	typedef SV SV8; /* byte-sv, used for argument-checking */
31		109
32	enum {	110	enum {
33	REQ_QUIT,	111	REQ_QUIT,
34	REQ_OPEN, REQ_CLOSE,	112	REQ_OPEN, REQ_CLOSE,
35	REQ_READ, REQ_WRITE, REQ_READAHEAD,	113	REQ_READ, REQ_WRITE,
		114	REQ_READAHEAD, REQ_SENDFILE,
36	REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,	115	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
		116	REQ_TRUNCATE, REQ_FTRUNCATE,
		117	REQ_UTIME, REQ_FUTIME,
		118	REQ_CHMOD, REQ_FCHMOD,
		119	REQ_CHOWN, REQ_FCHOWN,
37	REQ_FSYNC, REQ_FDATASYNC,	120	REQ_FSYNC, REQ_FDATASYNC,
		121	REQ_UNLINK, REQ_RMDIR, REQ_MKDIR, REQ_RENAME,
		122	REQ_MKNOD, REQ_READDIR,
		123	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		124	REQ_GROUP, REQ_NOP,
		125	REQ_BUSY,
38	};	126	};
39		127
		128	#define AIO_REQ_KLASS "IO::AIO::REQ"
		129	#define AIO_GRP_KLASS "IO::AIO::GRP"
		130
40	typedef struct aio_cb {	131	typedef struct aio_cb
		132	{
41	struct aio_cb *volatile next;	133	struct aio_cb *volatile next;
42		134
		135	SV *callback;
		136	SV *sv1, *sv2;
		137	void *ptr1, *ptr2;
		138	off_t offs;
		139	size_t size;
		140	ssize_t result;
		141	double nv1, nv2;
		142
		143	STRLEN stroffset;
43	int type;	144	int type;
44		145	int int1, int2, int3;
45	int fd;	146	int errorno;
46	off_t offset;
47	size_t length;
48	ssize_t result;
49	mode_t mode; /* open */	147	mode_t mode; /* open */
50	int errorno;
51	SV *data, *callback, *fh;
52	void *dataptr;
53	STRLEN dataoffset;
54		148
55	Stat_t *statdata;	149	unsigned char flags;
		150	unsigned char pri;
		151
		152	SV *self; /* the perl counterpart of this request, if any */
		153	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
56	} aio_cb;	154	} aio_cb;
57		155
		156	enum {
		157	FLAG_CANCELLED = 0x01, /* request was cancelled */
		158	FLAG_SV2_RO_OFF = 0x40, /* data was set readonly */
		159	FLAG_PTR2_FREE = 0x80, /* need to free(ptr2) */
		160	};
		161
58	typedef aio_cb *aio_req;	162	typedef aio_cb *aio_req;
		163	typedef aio_cb *aio_req_ornot;
59		164
60	static int started;	165	enum {
61	static volatile int nreqs;	166	PRI_MIN = -4,
62	static int max_outstanding = 1<<30;	167	PRI_MAX = 4,
		168
		169	DEFAULT_PRI = 0,
		170	PRI_BIAS = -PRI_MIN,
		171	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		172	};
		173
		174	#define AIO_TICKS ((1000000 + 1023) >> 10)
		175
		176	static unsigned int max_poll_time = 0;
		177	static unsigned int max_poll_reqs = 0;
		178
		179	/* calculcate time difference in ~1/AIO_TICKS of a second */
		180	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		181	{
		182	return (tv2->tv_sec - tv1->tv_sec ) * AIO_TICKS
		183	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		184	}
		185
		186	static thread_t main_tid;
		187	static int main_sig;
		188	static int block_sig_level;
		189
		190	void block_sig ()
		191	{
		192	sigset_t ss;
		193
		194	if (block_sig_level++)
		195	return;
		196
		197	if (!main_sig)
		198	return;
		199
		200	sigemptyset (&ss);
		201	sigaddset (&ss, main_sig);
		202	pthread_sigmask (SIG_BLOCK, &ss, 0);
		203	}
		204
		205	void unblock_sig ()
		206	{
		207	sigset_t ss;
		208
		209	if (--block_sig_level)
		210	return;
		211
		212	if (!main_sig)
		213	return;
		214
		215	sigemptyset (&ss);
		216	sigaddset (&ss, main_sig);
		217	pthread_sigmask (SIG_UNBLOCK, &ss, 0);
		218	}
		219
		220	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		221
		222	static unsigned int started, idle, wanted;
		223
		224	/* worker threads management */
		225	static mutex_t wrklock = X_MUTEX_INIT;
		226
		227	typedef struct worker {
		228	/* locked by wrklock */
		229	struct worker *prev, *next;
		230
		231	thread_t tid;
		232
		233	/* locked by reslock, reqlock or wrklock */
		234	aio_req req; /* currently processed request */
		235	void *dbuf;
		236	DIR *dirp;
		237	} worker;
		238
		239	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		240
		241	static void worker_clear (worker *wrk)
		242	{
		243	if (wrk->dirp)
		244	{
		245	closedir (wrk->dirp);
		246	wrk->dirp = 0;
		247	}
		248
		249	if (wrk->dbuf)
		250	{
		251	free (wrk->dbuf);
		252	wrk->dbuf = 0;
		253	}
		254	}
		255
		256	static void worker_free (worker *wrk)
		257	{
		258	wrk->next->prev = wrk->prev;
		259	wrk->prev->next = wrk->next;
		260
		261	free (wrk);
		262	}
		263
		264	static volatile unsigned int nreqs, nready, npending;
		265	static volatile unsigned int max_idle = 4;
		266	static volatile unsigned int max_outstanding = 0xffffffff;
63	static int respipe [2];	267	static int respipe [2];
64		268
65	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	269	static mutex_t reslock = X_MUTEX_INIT;
66	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	270	static mutex_t reqlock = X_MUTEX_INIT;
67	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	271	static cond_t reqwait = X_COND_INIT;
68		272
69	static volatile aio_req reqs, reqe; /* queue start, queue end */	273	#if WORDACCESS_UNSAFE
70	static volatile aio_req ress, rese; /* queue start, queue end */
71		274
72	static void	275	static unsigned int get_nready ()
73	poll_wait ()
74	{	276	{
75	if (nreqs && !ress)	277	unsigned int retval;
		278
		279	X_LOCK (reqlock);
		280	retval = nready;
		281	X_UNLOCK (reqlock);
		282
		283	return retval;
		284	}
		285
		286	static unsigned int get_npending ()
		287	{
		288	unsigned int retval;
		289
		290	X_LOCK (reslock);
		291	retval = npending;
		292	X_UNLOCK (reslock);
		293
		294	return retval;
		295	}
		296
		297	static unsigned int get_nthreads ()
		298	{
		299	unsigned int retval;
		300
		301	X_LOCK (wrklock);
		302	retval = started;
		303	X_UNLOCK (wrklock);
		304
		305	return retval;
		306	}
		307
		308	#else
		309
		310	# define get_nready() nready
		311	# define get_npending() npending
		312	# define get_nthreads() started
		313
		314	#endif
		315
		316	/*
		317	* a somewhat faster data structure might be nice, but
		318	* with 8 priorities this actually needs <20 insns
		319	* per shift, the most expensive operation.
		320	*/
		321	typedef struct {
		322	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		323	int size;
		324	} reqq;
		325
		326	static reqq req_queue;
		327	static reqq res_queue;
		328
		329	int reqq_push (reqq *q, aio_req req)
		330	{
		331	int pri = req->pri;
		332	req->next = 0;
		333
		334	if (q->qe[pri])
76	{	335	{
77	fd_set rfd;	336	q->qe[pri]->next = req;
78	FD_ZERO(&rfd);	337	q->qe[pri] = req;
79	FD_SET(respipe [0], &rfd);
80
81	select (respipe [0] + 1, &rfd, 0, 0, 0);
82	}	338	}
83	}	339	else
		340	q->qe[pri] = q->qs[pri] = req;
84		341
85	static int	342	return q->size++;
86	poll_cb ()	343	}
		344
		345	aio_req reqq_shift (reqq *q)
		346	{
		347	int pri;
		348
		349	if (!q->size)
		350	return 0;
		351
		352	--q->size;
		353
		354	for (pri = NUM_PRI; pri--; )
		355	{
		356	aio_req req = q->qs[pri];
		357
		358	if (req)
		359	{
		360	if (!(q->qs[pri] = req->next))
		361	q->qe[pri] = 0;
		362
		363	return req;
		364	}
		365	}
		366
		367	abort ();
		368	}
		369
		370	static int poll_cb ();
		371	static int req_invoke (aio_req req);
		372	static void req_destroy (aio_req req);
		373	static void req_cancel (aio_req req);
		374
		375	/* must be called at most once */
		376	static SV *req_sv (aio_req req, const char *klass)
		377	{
		378	if (!req->self)
		379	{
		380	req->self = (SV *)newHV ();
		381	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		382	}
		383
		384	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		385	}
		386
		387	static aio_req SvAIO_REQ (SV *sv)
		388	{
		389	MAGIC *mg;
		390
		391	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		392	croak ("object of class " AIO_REQ_KLASS " expected");
		393
		394	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		395
		396	return mg ? (aio_req)mg->mg_ptr : 0;
		397	}
		398
		399	static void aio_grp_feed (aio_req grp)
		400	{
		401	block_sig ();
		402
		403	while (grp->size < grp->int2 && !(grp->flags & FLAG_CANCELLED))
		404	{
		405	int old_len = grp->size;
		406
		407	if (grp->sv2 && SvOK (grp->sv2))
		408	{
		409	dSP;
		410
		411	ENTER;
		412	SAVETMPS;
		413	PUSHMARK (SP);
		414	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		415	PUTBACK;
		416	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		417	SPAGAIN;
		418	FREETMPS;
		419	LEAVE;
		420	}
		421
		422	/* stop if no progress has been made */
		423	if (old_len == grp->size)
		424	{
		425	SvREFCNT_dec (grp->sv2);
		426	grp->sv2 = 0;
		427	break;
		428	}
		429	}
		430
		431	unblock_sig ();
		432	}
		433
		434	static void aio_grp_dec (aio_req grp)
		435	{
		436	--grp->size;
		437
		438	/* call feeder, if applicable */
		439	aio_grp_feed (grp);
		440
		441	/* finish, if done */
		442	if (!grp->size && grp->int1)
		443	{
		444	block_sig ();
		445
		446	if (!req_invoke (grp))
		447	{
		448	req_destroy (grp);
		449	unblock_sig ();
		450	croak (0);
		451	}
		452
		453	req_destroy (grp);
		454	unblock_sig ();
		455	}
		456	}
		457
		458	static int req_invoke (aio_req req)
87	{	459	{
88	dSP;	460	dSP;
89	int count = 0;
90	aio_req req, prv;
91		461
92	pthread_mutex_lock (&reslock);	462	if (req->flags & FLAG_SV2_RO_OFF)
		463	SvREADONLY_off (req->sv2);
93		464
94	{	465	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
95	/* read any signals sent by the worker threads */
96	char buf [32];
97	while (read (respipe [0], buf, 32) > 0)
98	;
99	}
100
101	req = ress;
102	ress = rese = 0;
103
104	pthread_mutex_unlock (&reslock);
105
106	while (req)
107	{	466	{
108	nreqs--;	467	ENTER;
		468	SAVETMPS;
		469	PUSHMARK (SP);
		470	EXTEND (SP, 1);
109		471
110	if (req->type == REQ_QUIT)	472	switch (req->type)
111	started--;
112	else
113	{	473	{
114	int errorno = errno;	474	case REQ_READDIR:
115	errno = req->errorno;
116
117	if (req->type == REQ_READ)
118	SvCUR_set (req->data, req->dataoffset
119	+ req->result > 0 ? req->result : 0);
120
121	if (req->data)
122	SvREFCNT_dec (req->data);
123
124	if (req->fh)
125	SvREFCNT_dec (req->fh);
126
127	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
128	{	475	{
129	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	476	SV *rv = &PL_sv_undef;
130	PL_laststatval = req->result;
131	PL_statcache = *(req->statdata);
132		477
133	Safefree (req->statdata);	478	if (req->result >= 0)
		479	{
		480	int i;
		481	char *buf = req->ptr2;
		482	AV *av = newAV ();
		483
		484	av_extend (av, req->result - 1);
		485
		486	for (i = 0; i < req->result; ++i)
		487	{
		488	SV *sv = newSVpv (buf, 0);
		489
		490	av_store (av, i, sv);
		491	buf += SvCUR (sv) + 1;
		492	}
		493
		494	rv = sv_2mortal (newRV_noinc ((SV *)av));
		495	}
		496
		497	PUSHs (rv);
134	}	498	}
		499	break;
135		500
136	ENTER;	501	case REQ_OPEN:
137	PUSHMARK (SP);
138	XPUSHs (sv_2mortal (newSViv (req->result)));
139
140	if (req->type == REQ_OPEN)
141	{	502	{
142	/* convert fd to fh */	503	/* convert fd to fh */
143	SV *fh;	504	SV *fh;
144		505
		506	PUSHs (sv_2mortal (newSViv (req->result)));
145	PUTBACK;	507	PUTBACK;
146	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	508	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
147	SPAGAIN;	509	SPAGAIN;
148		510
149	fh = SvREFCNT_inc (POPs);	511	fh = POPs;
150
151	PUSHMARK (SP);	512	PUSHMARK (SP);
152	XPUSHs (sv_2mortal (fh));	513	XPUSHs (fh);
153	}	514	}
		515	break;
154		516
155	if (SvOK (req->callback))	517	case REQ_GROUP:
		518	req->int1 = 2; /* mark group as finished */
		519
		520	if (req->sv1)
156	{	521	{
157	PUTBACK;	522	int i;
158	call_sv (req->callback, G_VOID | G_EVAL);	523	AV *av = (AV *)req->sv1;
159	SPAGAIN;	524
		525	EXTEND (SP, AvFILL (av) + 1);
		526	for (i = 0; i <= AvFILL (av); ++i)
		527	PUSHs (*av_fetch (av, i, 0));
160	}	528	}
		529	break;
161		530
162	LEAVE;	531	case REQ_NOP:
		532	case REQ_BUSY:
		533	break;
		534
		535	case REQ_READLINK:
		536	if (req->result > 0)
163		537	{
164	if (req->callback)	538	SvCUR_set (req->sv2, req->result);
165	SvREFCNT_dec (req->callback);	539	*SvEND (req->sv2) = 0;
		540	PUSHs (req->sv2);
		541	}
		542	break;
166		543
167	errno = errorno;	544	case REQ_STAT:
168	count++;	545	case REQ_LSTAT:
		546	case REQ_FSTAT:
		547	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		548	PL_laststatval = req->result;
		549	PL_statcache = *(Stat_t *)(req->ptr2);
		550	PUSHs (sv_2mortal (newSViv (req->result)));
		551	break;
		552
		553	case REQ_READ:
		554	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		555	*SvEND (req->sv2) = 0;
		556	PUSHs (sv_2mortal (newSViv (req->result)));
		557	break;
		558
		559	default:
		560	PUSHs (sv_2mortal (newSViv (req->result)));
		561	break;
169	}	562	}
170		563
171	prv = req;	564	errno = req->errorno;
172	req = req->next;
173	Safefree (prv);
174		565
175	/* TODO: croak on errors? */	566	PUTBACK;
		567	call_sv (req->callback, G_VOID | G_EVAL);
		568	SPAGAIN;
		569
		570	FREETMPS;
		571	LEAVE;
176	}	572	}
177		573
178	return count;
179	}
180
181	static void *aio_proc(void *arg);
182
183	static void
184	start_thread (void)
185	{
186	sigset_t fullsigset, oldsigset;
187	pthread_t tid;
188	pthread_attr_t attr;
189
190	pthread_attr_init (&attr);
191	pthread_attr_setstacksize (&attr, STACKSIZE);
192	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
193
194	sigfillset (&fullsigset);
195	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
196
197	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
198	started++;
199
200	sigprocmask (SIG_SETMASK, &oldsigset, 0);
201	}
202
203	static void
204	send_req (aio_req req)
205	{
206	nreqs++;
207
208	pthread_mutex_lock (&reqlock);
209
210	req->next = 0;
211
212	if (reqe)	574	if (req->grp)
213	{	575	{
214	reqe->next = req;	576	aio_req grp = req->grp;
215	reqe = req;	577
		578	/* unlink request */
		579	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		580	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		581
		582	if (grp->grp_first == req)
		583	grp->grp_first = req->grp_next;
		584
		585	aio_grp_dec (grp);
		586	}
		587
		588	return !SvTRUE (ERRSV);
		589	}
		590
		591	static void req_destroy (aio_req req)
		592	{
		593	if (req->self)
		594	{
		595	sv_unmagic (req->self, PERL_MAGIC_ext);
		596	SvREFCNT_dec (req->self);
		597	}
		598
		599	SvREFCNT_dec (req->sv1);
		600	SvREFCNT_dec (req->sv2);
		601	SvREFCNT_dec (req->callback);
		602
		603	if (req->flags & FLAG_PTR2_FREE)
		604	free (req->ptr2);
		605
		606	Safefree (req);
		607	}
		608
		609	static void req_cancel_subs (aio_req grp)
		610	{
		611	aio_req sub;
		612
		613	if (grp->type != REQ_GROUP)
		614	return;
		615
		616	SvREFCNT_dec (grp->sv2);
		617	grp->sv2 = 0;
		618
		619	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		620	req_cancel (sub);
		621	}
		622
		623	static void req_cancel (aio_req req)
		624	{
		625	req->flags |= FLAG_CANCELLED;
		626
		627	req_cancel_subs (req);
		628	}
		629
		630	X_THREAD_PROC (aio_proc);
		631
		632	static void start_thread (void)
		633	{
		634	worker *wrk = calloc (1, sizeof (worker));
		635
		636	if (!wrk)
		637	croak ("unable to allocate worker thread data");
		638
		639	X_LOCK (wrklock);
		640
		641	if (thread_create (&wrk->tid, aio_proc, (void *)wrk))
		642	{
		643	wrk->prev = &wrk_first;
		644	wrk->next = wrk_first.next;
		645	wrk_first.next->prev = wrk;
		646	wrk_first.next = wrk;
		647	++started;
216	}	648	}
217	else	649	else
218	reqe = reqs = req;	650	free (wrk);
219		651
220	pthread_cond_signal (&reqwait);	652	X_UNLOCK (wrklock);
221	pthread_mutex_unlock (&reqlock);	653	}
222		654
223	while (nreqs > max_outstanding)	655	static void maybe_start_thread ()
		656	{
		657	if (get_nthreads () >= wanted)
		658	return;
		659
		660	/* todo: maybe use idle here, but might be less exact */
		661	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		662	return;
		663
		664	start_thread ();
		665	}
		666
		667	static void req_send (aio_req req)
		668	{
		669	block_sig ();
		670
		671	++nreqs;
		672
		673	X_LOCK (reqlock);
		674	++nready;
		675	reqq_push (&req_queue, req);
		676	X_COND_SIGNAL (reqwait);
		677	X_UNLOCK (reqlock);
		678
		679	unblock_sig ();
		680
		681	maybe_start_thread ();
		682	}
		683
		684	static void end_thread (void)
		685	{
		686	aio_req req;
		687
		688	Newz (0, req, 1, aio_cb);
		689
		690	req->type = REQ_QUIT;
		691	req->pri = PRI_MAX + PRI_BIAS;
		692
		693	X_LOCK (reqlock);
		694	reqq_push (&req_queue, req);
		695	X_COND_SIGNAL (reqwait);
		696	X_UNLOCK (reqlock);
		697
		698	X_LOCK (wrklock);
		699	--started;
		700	X_UNLOCK (wrklock);
		701	}
		702
		703	static void set_max_idle (int nthreads)
		704	{
		705	if (WORDACCESS_UNSAFE) X_LOCK (reqlock);
		706	max_idle = nthreads <= 0 ? 1 : nthreads;
		707	if (WORDACCESS_UNSAFE) X_UNLOCK (reqlock);
		708	}
		709
		710	static void min_parallel (int nthreads)
		711	{
		712	if (wanted < nthreads)
		713	wanted = nthreads;
		714	}
		715
		716	static void max_parallel (int nthreads)
		717	{
		718	if (wanted > nthreads)
		719	wanted = nthreads;
		720
		721	while (started > wanted)
		722	end_thread ();
		723	}
		724
		725	static void poll_wait ()
		726	{
		727	fd_set rfd;
		728
		729	while (nreqs)
224	{	730	{
		731	int size;
		732	if (WORDACCESS_UNSAFE) X_LOCK (reslock);
		733	size = res_queue.size;
		734	if (WORDACCESS_UNSAFE) X_UNLOCK (reslock);
		735
		736	if (size)
		737	return;
		738
		739	maybe_start_thread ();
		740
		741	FD_ZERO(&rfd);
		742	FD_SET(respipe [0], &rfd);
		743
		744	select (respipe [0] + 1, &rfd, 0, 0, 0);
		745	}
		746	}
		747
		748	static int poll_cb ()
		749	{
		750	dSP;
		751	int count = 0;
		752	int maxreqs = max_poll_reqs;
		753	int do_croak = 0;
		754	struct timeval tv_start, tv_now;
		755	aio_req req;
		756
		757	if (max_poll_time)
		758	gettimeofday (&tv_start, 0);
		759
		760	block_sig ();
		761
		762	for (;;)
		763	{
		764	for (;;)
		765	{
		766	maybe_start_thread ();
		767
		768	X_LOCK (reslock);
		769	req = reqq_shift (&res_queue);
		770
		771	if (req)
		772	{
		773	--npending;
		774
		775	if (!res_queue.size)
		776	{
		777	/* read any signals sent by the worker threads */
		778	char buf [4];
		779	while (read (respipe [0], buf, 4) == 4)
		780	;
		781	}
		782	}
		783
		784	X_UNLOCK (reslock);
		785
		786	if (!req)
		787	break;
		788
		789	--nreqs;
		790
		791	if (req->type == REQ_GROUP && req->size)
		792	{
		793	req->int1 = 1; /* mark request as delayed */
		794	continue;
		795	}
		796	else
		797	{
		798	if (!req_invoke (req))
		799	{
		800	req_destroy (req);
		801	unblock_sig ();
		802	croak (0);
		803	}
		804
		805	count++;
		806	}
		807
		808	req_destroy (req);
		809
		810	if (maxreqs && !--maxreqs)
		811	break;
		812
		813	if (max_poll_time)
		814	{
		815	gettimeofday (&tv_now, 0);
		816
		817	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
		818	break;
		819	}
		820	}
		821
		822	if (nreqs <= max_outstanding)
		823	break;
		824
225	poll_wait ();	825	poll_wait ();
226	poll_cb ();	826
		827	++maxreqs;
227	}	828	}
228	}
229		829
230	static void	830	unblock_sig ();
231	end_thread (void)	831	return count;
232	{
233	aio_req req;
234	New (0, req, 1, aio_cb);
235	req->type = REQ_QUIT;
236
237	send_req (req);
238	}	832	}
239		833
		834	/*****************************************************************************/
240	/* work around various missing functions */	835	/* work around various missing functions */
241		836
242	#if !HAVE_PREADWRITE	837	#if !HAVE_PREADWRITE
243	# define pread aio_pread	838	# define pread aio_pread
244	# define pwrite aio_pwrite	839	# define pwrite aio_pwrite
…		…
246	/*	841	/*
247	* make our pread/pwrite safe against themselves, but not against	842	* make our pread/pwrite safe against themselves, but not against
248	* normal read/write by using a mutex. slows down execution a lot,	843	* normal read/write by using a mutex. slows down execution a lot,
249	* but that's your problem, not mine.	844	* but that's your problem, not mine.
250	*/	845	*/
251	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	846	static mutex_t preadwritelock = X_MUTEX_INIT;
252		847
253	static ssize_t	848	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
254	pread (int fd, void *buf, size_t count, off_t offset)
255	{	849	{
256	ssize_t res;	850	ssize_t res;
257	off_t ooffset;	851	off_t ooffset;
258		852
259	pthread_mutex_lock (&iolock);	853	X_LOCK (preadwritelock);
260	ooffset = lseek (fd, 0, SEEK_CUR);	854	ooffset = lseek (fd, 0, SEEK_CUR);
261	lseek (fd, offset, SEEK_SET);	855	lseek (fd, offset, SEEK_SET);
262	res = read (fd, buf, count);	856	res = read (fd, buf, count);
263	lseek (fd, ooffset, SEEK_SET);	857	lseek (fd, ooffset, SEEK_SET);
264	pthread_mutex_unlock (&iolock);	858	X_UNLOCK (preadwritelock);
265		859
266	return res;	860	return res;
267	}	861	}
268		862
269	static ssize_t
270	pwrite (int fd, void *buf, size_t count, off_t offset)	863	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
271	{	864	{
272	ssize_t res;	865	ssize_t res;
273	off_t ooffset;	866	off_t ooffset;
274		867
275	pthread_mutex_lock (&iolock);	868	X_LOCK (preadwritelock);
276	ooffset = lseek (fd, 0, SEEK_CUR);	869	ooffset = lseek (fd, 0, SEEK_CUR);
277	lseek (fd, offset, SEEK_SET);	870	lseek (fd, offset, SEEK_SET);
278	res = write (fd, buf, count);	871	res = write (fd, buf, count);
279	lseek (fd, offset, SEEK_SET);	872	lseek (fd, offset, SEEK_SET);
280	pthread_mutex_unlock (&iolock);	873	X_UNLOCK (preadwritelock);
281		874
282	return res;	875	return res;
283	}	876	}
		877	#endif
		878
		879	#ifndef HAVE_FUTIMES
		880
		881	# define utimes(path,times) aio_utimes (path, times)
		882	# define futimes(fd,times) aio_futimes (fd, times)
		883
		884	int aio_utimes (const char *filename, const struct timeval times[2])
		885	{
		886	if (times)
		887	{
		888	struct utimbuf buf;
		889
		890	buf.actime = times[0].tv_sec;
		891	buf.modtime = times[1].tv_sec;
		892
		893	return utime (filename, &buf);
		894	}
		895	else
		896	return utime (filename, 0);
		897	}
		898
		899	int aio_futimes (int fd, const struct timeval tv[2])
		900	{
		901	errno = ENOSYS;
		902	return -1;
		903	}
		904
284	#endif	905	#endif
285		906
286	#if !HAVE_FDATASYNC	907	#if !HAVE_FDATASYNC
287	# define fdatasync fsync	908	# define fdatasync fsync
288	#endif	909	#endif
289		910
290	#if !HAVE_READAHEAD	911	#if !HAVE_READAHEAD
291	# define readahead aio_readahead	912	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
292		913
293	static char readahead_buf[4096];	914	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
294
295	static ssize_t
296	readahead (int fd, off_t offset, size_t count)
297	{	915	{
		916	size_t todo = count;
		917	dBUF;
		918
298	while (count > 0)	919	while (todo > 0)
299	{	920	{
300	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	921	size_t len = todo < AIO_BUFSIZE ? todo : AIO_BUFSIZE;
301		922
302	pread (fd, readahead_buf, len, offset);	923	pread (fd, aio_buf, len, offset);
303	offset += len;	924	offset += len;
304	count -= len;	925	todo -= len;
305	}	926	}
306		927
307	errno = 0;	928	errno = 0;
		929	return count;
308	}	930	}
		931
309	#endif	932	#endif
310		933
311	static void *	934	#if !HAVE_READDIR_R
312	aio_proc (void *thr_arg)	935	# define readdir_r aio_readdir_r
		936
		937	static mutex_t readdirlock = X_MUTEX_INIT;
		938
		939	static int readdir_r (DIR *dirp, X_DIRENT *ent, X_DIRENT **res)
313	{	940	{
		941	X_DIRENT *e;
		942	int errorno;
		943
		944	X_LOCK (readdirlock);
		945
		946	e = readdir (dirp);
		947	errorno = errno;
		948
		949	if (e)
		950	{
		951	*res = ent;
		952	strcpy (ent->d_name, e->d_name);
		953	}
		954	else
		955	*res = 0;
		956
		957	X_UNLOCK (readdirlock);
		958
		959	errno = errorno;
		960	return e ? 0 : -1;
		961	}
		962	#endif
		963
		964	/* sendfile always needs emulation */
		965	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
		966	{
		967	ssize_t res;
		968
		969	if (!count)
		970	return 0;
		971
		972	#if HAVE_SENDFILE
		973	# if __linux
		974	res = sendfile (ofd, ifd, &offset, count);
		975
		976	# elif __freebsd
		977	/*
		978	* Of course, the freebsd sendfile is a dire hack with no thoughts
		979	* wasted on making it similar to other I/O functions.
		980	*/
		981	{
		982	off_t sbytes;
		983	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		984
		985	if (res < 0 && sbytes)
		986	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
		987	res = sbytes;
		988	}
		989
		990	# elif __hpux
		991	res = sendfile (ofd, ifd, offset, count, 0, 0);
		992
		993	# elif __solaris
		994	{
		995	struct sendfilevec vec;
		996	size_t sbytes;
		997
		998	vec.sfv_fd = ifd;
		999	vec.sfv_flag = 0;
		1000	vec.sfv_off = offset;
		1001	vec.sfv_len = count;
		1002
		1003	res = sendfilev (ofd, &vec, 1, &sbytes);
		1004
		1005	if (res < 0 && sbytes)
		1006	res = sbytes;
		1007	}
		1008
		1009	# endif
		1010	#else
		1011	res = -1;
		1012	errno = ENOSYS;
		1013	#endif
		1014
		1015	if (res < 0
		1016	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		1017	#if __solaris
		1018	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		1019	#endif
		1020	)
		1021	)
		1022	{
		1023	/* emulate sendfile. this is a major pain in the ass */
		1024	dBUF;
		1025
		1026	res = 0;
		1027
		1028	while (count)
		1029	{
		1030	ssize_t cnt;
		1031
		1032	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
		1033
		1034	if (cnt <= 0)
		1035	{
		1036	if (cnt && !res) res = -1;
		1037	break;
		1038	}
		1039
		1040	cnt = write (ofd, aio_buf, cnt);
		1041
		1042	if (cnt <= 0)
		1043	{
		1044	if (cnt && !res) res = -1;
		1045	break;
		1046	}
		1047
		1048	offset += cnt;
		1049	res += cnt;
		1050	count -= cnt;
		1051	}
		1052	}
		1053
		1054	return res;
		1055	}
		1056
		1057	/* read a full directory */
		1058	static void scandir_ (aio_req req, worker *self)
		1059	{
		1060	DIR *dirp;
		1061	union
		1062	{
		1063	X_DIRENT d;
		1064	char b [offsetof (X_DIRENT, d_name) + NAME_MAX + 1];
		1065	} *u;
		1066	X_DIRENT *entp;
		1067	char *name, *names;
		1068	int memlen = 4096;
		1069	int memofs = 0;
		1070	int res = 0;
		1071
		1072	X_LOCK (wrklock);
		1073	self->dirp = dirp = opendir (req->ptr1);
		1074	self->dbuf = u = malloc (sizeof (*u));
		1075	req->flags |= FLAG_PTR2_FREE;
		1076	req->ptr2 = names = malloc (memlen);
		1077	X_UNLOCK (wrklock);
		1078
		1079	if (dirp && u && names)
		1080	for (;;)
		1081	{
		1082	errno = 0;
		1083	readdir_r (dirp, &u->d, &entp);
		1084
		1085	if (!entp)
		1086	break;
		1087
		1088	name = entp->d_name;
		1089
		1090	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1091	{
		1092	int len = strlen (name) + 1;
		1093
		1094	res++;
		1095
		1096	while (memofs + len > memlen)
		1097	{
		1098	memlen *= 2;
		1099	X_LOCK (wrklock);
		1100	req->ptr2 = names = realloc (names, memlen);
		1101	X_UNLOCK (wrklock);
		1102
		1103	if (!names)
		1104	break;
		1105	}
		1106
		1107	memcpy (names + memofs, name, len);
		1108	memofs += len;
		1109	}
		1110	}
		1111
		1112	if (errno)
		1113	res = -1;
		1114
		1115	req->result = res;
		1116	}
		1117
		1118	/*****************************************************************************/
		1119
		1120	X_THREAD_PROC (aio_proc)
		1121	{
		1122	{//D
314	aio_req req;	1123	aio_req req;
315	int type;	1124	struct timespec ts;
		1125	worker *self = (worker *)thr_arg;
316		1126
317	do	1127	/* try to distribute timeouts somewhat randomly */
		1128	ts.tv_nsec = ((unsigned long)self & 1023UL) * (1000000000UL / 1024UL);
		1129
		1130	for (;;)
318	{	1131	{
319	pthread_mutex_lock (&reqlock);	1132	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1133
		1134	X_LOCK (reqlock);
320		1135
321	for (;;)	1136	for (;;)
322	{	1137	{
323	req = reqs;	1138	self->req = req = reqq_shift (&req_queue);
324
325	if (reqs)
326	{
327	reqs = reqs->next;
328	if (!reqs) reqe = 0;
329	}
330		1139
331	if (req)	1140	if (req)
332	break;	1141	break;
333		1142
334	pthread_cond_wait (&reqwait, &reqlock);	1143	++idle;
		1144
		1145	if (X_COND_TIMEDWAIT (reqwait, reqlock, ts)
		1146	== ETIMEDOUT)
		1147	{
		1148	if (idle > max_idle)
		1149	{
		1150	--idle;
		1151	X_UNLOCK (reqlock);
		1152	X_LOCK (wrklock);
		1153	--started;
		1154	X_UNLOCK (wrklock);
		1155	goto quit;
		1156	}
		1157
		1158	/* we are allowed to idle, so do so without any timeout */
		1159	X_COND_WAIT (reqwait, reqlock);
		1160	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1161	}
		1162
		1163	--idle;
335	}	1164	}
336		1165
337	pthread_mutex_unlock (&reqlock);	1166	--nready;
		1167
		1168	X_UNLOCK (reqlock);
338		1169
339	errno = 0; /* strictly unnecessary */	1170	errno = 0; /* strictly unnecessary */
340		1171
341	type = req->type;	1172	if (!(req->flags & FLAG_CANCELLED))
342
343	switch (type)	1173	switch (req->type)
		1174	{
		1175	case REQ_READ: req->result = req->offs >= 0
		1176	? pread (req->int1, req->ptr1, req->size, req->offs)
		1177	: read (req->int1, req->ptr1, req->size); break;
		1178	case REQ_WRITE: req->result = req->offs >= 0
		1179	? pwrite (req->int1, req->ptr1, req->size, req->offs)
		1180	: write (req->int1, req->ptr1, req->size); break;
		1181
		1182	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
		1183	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
		1184
		1185	case REQ_STAT: req->result = stat (req->ptr1, (Stat_t *)req->ptr2); break;
		1186	case REQ_LSTAT: req->result = lstat (req->ptr1, (Stat_t *)req->ptr2); break;
		1187	case REQ_FSTAT: req->result = fstat (req->int1, (Stat_t *)req->ptr2); break;
		1188
		1189	case REQ_CHOWN: req->result = chown (req->ptr1, req->int2, req->int3); break;
		1190	case REQ_FCHOWN: req->result = fchown (req->int1, req->int2, req->int3); break;
		1191	case REQ_CHMOD: req->result = chmod (req->ptr1, req->mode); break;
		1192	case REQ_FCHMOD: req->result = fchmod (req->int1, req->mode); break;
		1193	case REQ_TRUNCATE: req->result = truncate (req->ptr1, req->offs); break;
		1194	case REQ_FTRUNCATE: req->result = ftruncate (req->int1, req->offs); break;
		1195
		1196	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
		1197	case REQ_CLOSE: req->result = close (req->int1); break;
		1198	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
		1199	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
		1200	case REQ_MKDIR: req->result = mkdir (req->ptr1, req->mode); break;
		1201	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
		1202	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
		1203	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1204	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1205	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
		1206
		1207	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
		1208	case REQ_FSYNC: req->result = fsync (req->int1); break;
		1209	case REQ_READDIR: scandir_ (req, self); break;
		1210
		1211	case REQ_BUSY:
		1212	#ifdef _WIN32
		1213	Sleep (req->nv1 * 1000.);
		1214	#else
		1215	{
		1216	struct timeval tv;
		1217
		1218	tv.tv_sec = req->nv1;
		1219	tv.tv_usec = (req->nv1 - tv.tv_sec) * 1000000.;
		1220
		1221	req->result = select (0, 0, 0, 0, &tv);
		1222	}
		1223	#endif
		1224	break;
		1225
		1226	case REQ_UTIME:
		1227	case REQ_FUTIME:
		1228	{
		1229	struct timeval tv[2];
		1230	struct timeval *times;
		1231
		1232	if (req->nv1 != -1. || req->nv2 != -1.)
		1233	{
		1234	tv[0].tv_sec = req->nv1;
		1235	tv[0].tv_usec = (req->nv1 - tv[0].tv_sec) * 1000000.;
		1236	tv[1].tv_sec = req->nv2;
		1237	tv[1].tv_usec = (req->nv2 - tv[1].tv_sec) * 1000000.;
		1238
		1239	times = tv;
		1240	}
		1241	else
		1242	times = 0;
		1243
		1244
		1245	req->result = req->type == REQ_FUTIME
		1246	? futimes (req->int1, times)
		1247	: utimes (req->ptr1, times);
		1248	}
		1249
		1250	case REQ_GROUP:
		1251	case REQ_NOP:
		1252	break;
		1253
		1254	case REQ_QUIT:
		1255	goto quit;
		1256
		1257	default:
		1258	req->result = -1;
		1259	break;
		1260	}
		1261
		1262	req->errorno = errno;
		1263
		1264	X_LOCK (reslock);
		1265
		1266	++npending;
		1267
		1268	if (!reqq_push (&res_queue, req))
344	{	1269	{
345	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
346	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
347
348	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
349
350	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
351	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
352	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
353
354	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
355	case REQ_CLOSE: req->result = close (req->fd); break;
356	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
357
358	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
359	case REQ_FSYNC: req->result = fsync (req->fd); break;
360
361	case REQ_QUIT:
362	break;
363
364	default:
365	req->result = ENOSYS;
366	break;
367	}
368
369	req->errorno = errno;
370
371	pthread_mutex_lock (&reslock);
372
373	req->next = 0;
374
375	if (rese)
376	{
377	rese->next = req;
378	rese = req;
379	}
380	else
381	{
382	rese = ress = req;
383
384	/* write a dummy byte to the pipe so fh becomes ready */	1270	/* write a dummy byte to the pipe so fh becomes ready */
385	write (respipe [1], &respipe, 1);	1271	write (respipe [1], &respipe, 1);
		1272
		1273	/* optionally signal the main thread asynchronously */
		1274	if (main_sig)
		1275	pthread_kill (main_tid, main_sig);
386	}	1276	}
387		1277
388	pthread_mutex_unlock (&reslock);	1278	self->req = 0;
		1279	worker_clear (self);
		1280
		1281	X_UNLOCK (reslock);
389	}	1282	}
390	while (type != REQ_QUIT);	1283
		1284	quit:
		1285	X_LOCK (wrklock);
		1286	worker_free (self);
		1287	X_UNLOCK (wrklock);
391		1288
392	return 0;	1289	return 0;
		1290	}//D
393	}	1291	}
394		1292
		1293	/*****************************************************************************/
		1294
		1295	static void atfork_prepare (void)
		1296	{
		1297	X_LOCK (wrklock);
		1298	X_LOCK (reqlock);
		1299	X_LOCK (reslock);
		1300	#if !HAVE_PREADWRITE
		1301	X_LOCK (preadwritelock);
		1302	#endif
		1303	#if !HAVE_READDIR_R
		1304	X_LOCK (readdirlock);
		1305	#endif
		1306	}
		1307
		1308	static void atfork_parent (void)
		1309	{
		1310	#if !HAVE_READDIR_R
		1311	X_UNLOCK (readdirlock);
		1312	#endif
		1313	#if !HAVE_PREADWRITE
		1314	X_UNLOCK (preadwritelock);
		1315	#endif
		1316	X_UNLOCK (reslock);
		1317	X_UNLOCK (reqlock);
		1318	X_UNLOCK (wrklock);
		1319	}
		1320
		1321	static void atfork_child (void)
		1322	{
		1323	aio_req prv;
		1324
		1325	while (prv = reqq_shift (&req_queue))
		1326	req_destroy (prv);
		1327
		1328	while (prv = reqq_shift (&res_queue))
		1329	req_destroy (prv);
		1330
		1331	while (wrk_first.next != &wrk_first)
		1332	{
		1333	worker *wrk = wrk_first.next;
		1334
		1335	if (wrk->req)
		1336	req_destroy (wrk->req);
		1337
		1338	worker_clear (wrk);
		1339	worker_free (wrk);
		1340	}
		1341
		1342	started = 0;
		1343	idle = 0;
		1344	nreqs = 0;
		1345	nready = 0;
		1346	npending = 0;
		1347
		1348	close (respipe [0]);
		1349	close (respipe [1]);
		1350
		1351	if (!create_pipe (respipe))
		1352	croak ("cannot set result pipe to nonblocking mode");
		1353
		1354	atfork_parent ();
		1355	}
		1356
		1357	#define dREQ \
		1358	aio_req req; \
		1359	int req_pri = next_pri; \
		1360	next_pri = DEFAULT_PRI + PRI_BIAS; \
		1361	\
		1362	if (SvOK (callback) && !SvROK (callback)) \
		1363	croak ("callback must be undef or of reference type"); \
		1364	\
		1365	Newz (0, req, 1, aio_cb); \
		1366	if (!req) \
		1367	croak ("out of memory during aio_req allocation"); \
		1368	\
		1369	req->callback = newSVsv (callback); \
		1370	req->pri = req_pri
		1371
		1372	#define REQ_SEND \
		1373	req_send (req); \
		1374	\
		1375	if (GIMME_V != G_VOID) \
		1376	XPUSHs (req_sv (req, AIO_REQ_KLASS));
		1377
395	MODULE = IO::AIO PACKAGE = IO::AIO	1378	MODULE = IO::AIO PACKAGE = IO::AIO
396		1379
397	PROTOTYPES: ENABLE	1380	PROTOTYPES: ENABLE
398		1381
399	BOOT:	1382	BOOT:
400	{	1383	{
		1384	HV *stash = gv_stashpv ("IO::AIO", 1);
		1385
		1386	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		1387	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1388	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1389	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1390	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1391	#ifdef _WIN32
		1392	X_MUTEX_CHECK (wrklock);
		1393	X_MUTEX_CHECK (reslock);
		1394	X_MUTEX_CHECK (reqlock);
		1395	X_MUTEX_CHECK (reqwait);
		1396	X_MUTEX_CHECK (preadwritelock);
		1397	X_MUTEX_CHECK (readdirlock);
		1398	#else
		1399	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		1400	newCONSTSUB (stash, "SIGIO", newSViv (SIGIO));
		1401	#endif
		1402
401	if (pipe (respipe))	1403	if (!create_pipe (respipe))
402	croak ("unable to initialize result pipe");
403
404	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
405	croak ("cannot set result pipe to nonblocking mode");	1404	croak ("cannot set result pipe to nonblocking mode");
406		1405
407	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	1406	X_THREAD_ATFORK (atfork_prepare, atfork_parent, atfork_child);
408	croak ("cannot set result pipe to nonblocking mode");
409	}	1407	}
410		1408
411	void	1409	void
412	min_parallel(nthreads)	1410	max_poll_reqs (int nreqs)
413	int nthreads
414	PROTOTYPE: $	1411	PROTOTYPE: $
415	CODE:	1412	CODE:
416	while (nthreads > started)	1413	max_poll_reqs = nreqs;
417	start_thread ();
418		1414
419	void	1415	void
420	max_parallel(nthreads)	1416	max_poll_time (double nseconds)
421	int nthreads
422	PROTOTYPE: $	1417	PROTOTYPE: $
423	CODE:	1418	CODE:
424	{	1419	max_poll_time = nseconds * AIO_TICKS;
425	int cur = started;
426	while (cur > nthreads)
427	{
428	end_thread ();
429	cur--;
430	}
431		1420
432	while (started > nthreads)	1421	void
433	{	1422	min_parallel (int nthreads)
434	poll_wait ();	1423	PROTOTYPE: $
435	poll_cb ();	1424
436	}	1425	void
437	}	1426	max_parallel (int nthreads)
		1427	PROTOTYPE: $
		1428
		1429	void
		1430	max_idle (int nthreads)
		1431	PROTOTYPE: $
		1432	CODE:
		1433	set_max_idle (nthreads);
438		1434
439	int	1435	int
440	max_outstanding(nreqs)	1436	max_outstanding (int maxreqs)
441	int nreqs	1437	PROTOTYPE: $
442	PROTOTYPE: $
443	CODE:	1438	CODE:
444	RETVAL = max_outstanding;	1439	RETVAL = max_outstanding;
445	max_outstanding = nreqs;	1440	max_outstanding = maxreqs;
		1441	OUTPUT:
		1442	RETVAL
446		1443
447	void	1444	void
448	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1445	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
449	SV * pathname
450	int flags
451	int mode
452	SV * callback
453	PROTOTYPE: $$$;$	1446	PROTOTYPE: $$$;$
454	CODE:	1447	PPCODE:
455	{	1448	{
456	aio_req req;	1449	dREQ;
457
458	Newz (0, req, 1, aio_cb);
459
460	if (!req)
461	croak ("out of memory during aio_req allocation");
462		1450
463	req->type = REQ_OPEN;	1451	req->type = REQ_OPEN;
464	req->data = newSVsv (pathname);	1452	req->sv1 = newSVsv (pathname);
465	req->dataptr = SvPV_nolen (req->data);	1453	req->ptr1 = SvPVbyte_nolen (req->sv1);
466	req->fd = flags;	1454	req->int1 = flags;
467	req->mode = mode;	1455	req->mode = mode;
468	req->callback = SvREFCNT_inc (callback);
469		1456
470	send_req (req);	1457	REQ_SEND;
471	}	1458	}
472		1459
473	void	1460	void
474	aio_close(fh,callback=&PL_sv_undef)	1461	aio_close (SV *fh, SV *callback=&PL_sv_undef)
475	SV * fh
476	SV * callback
477	PROTOTYPE: $;$	1462	PROTOTYPE: $;$
478	ALIAS:	1463	ALIAS:
479	aio_close = REQ_CLOSE	1464	aio_close = REQ_CLOSE
480	aio_fsync = REQ_FSYNC	1465	aio_fsync = REQ_FSYNC
481	aio_fdatasync = REQ_FDATASYNC	1466	aio_fdatasync = REQ_FDATASYNC
482	CODE:	1467	PPCODE:
483	{	1468	{
484	aio_req req;	1469	dREQ;
485
486	Newz (0, req, 1, aio_cb);
487
488	if (!req)
489	croak ("out of memory during aio_req allocation");
490		1470
491	req->type = ix;	1471	req->type = ix;
492	req->fh = newSVsv (fh);	1472	req->sv1 = newSVsv (fh);
493	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1473	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
494	req->callback = SvREFCNT_inc (callback);
495		1474
496	send_req (req);	1475	REQ_SEND (req);
497	}	1476	}
498		1477
499	void	1478	void
500	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1479	aio_read (SV *fh, SV *offset, SV *length, SV8 *data, IV dataoffset, SV *callback=&PL_sv_undef)
501	SV * fh
502	UV offset
503	IV length
504	SV * data
505	IV dataoffset
506	SV * callback
507	ALIAS:	1480	ALIAS:
508	aio_read = REQ_READ	1481	aio_read = REQ_READ
509	aio_write = REQ_WRITE	1482	aio_write = REQ_WRITE
510	PROTOTYPE: $$$$$;$	1483	PROTOTYPE: $$$$$;$
511	CODE:	1484	PPCODE:
512	{	1485	{
513	aio_req req;
514	STRLEN svlen;	1486	STRLEN svlen;
515	char *svptr = SvPV (data, svlen);	1487	char *svptr = SvPVbyte (data, svlen);
		1488	UV len = SvUV (length);
516		1489
517	SvUPGRADE (data, SVt_PV);	1490	SvUPGRADE (data, SVt_PV);
518	SvPOK_on (data);	1491	SvPOK_on (data);
519		1492
520	if (dataoffset < 0)	1493	if (dataoffset < 0)
521	dataoffset += svlen;	1494	dataoffset += svlen;
522		1495
523	if (dataoffset < 0 || dataoffset > svlen)	1496	if (dataoffset < 0 || dataoffset > svlen)
524	croak ("data offset outside of string");	1497	croak ("dataoffset outside of data scalar");
525		1498
526	if (ix == REQ_WRITE)	1499	if (ix == REQ_WRITE)
527	{	1500	{
528	/* write: check length and adjust. */	1501	/* write: check length and adjust. */
529	if (length < 0 || length + dataoffset > svlen)	1502	if (!SvOK (length) || len + dataoffset > svlen)
530	length = svlen - dataoffset;	1503	len = svlen - dataoffset;
531	}	1504	}
532	else	1505	else
533	{	1506	{
534	/* read: grow scalar as necessary */	1507	/* read: grow scalar as necessary */
535	svptr = SvGROW (data, length + dataoffset);	1508	svptr = SvGROW (data, len + dataoffset + 1);
536	}	1509	}
537		1510
538	if (length < 0)	1511	if (len < 0)
539	croak ("length must not be negative");	1512	croak ("length must not be negative");
540		1513
541	Newz (0, req, 1, aio_cb);	1514	{
		1515	dREQ;
542		1516
543	if (!req)
544	croak ("out of memory during aio_req allocation");
545
546	req->type = ix;	1517	req->type = ix;
547	req->fh = newSVsv (fh);	1518	req->sv1 = newSVsv (fh);
548	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1519	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
549	: IoOFP (sv_2io (fh)));	1520	: IoOFP (sv_2io (fh)));
550	req->offset = offset;	1521	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
551	req->length = length;	1522	req->size = len;
552	req->data = SvREFCNT_inc (data);	1523	req->sv2 = SvREFCNT_inc (data);
553	req->dataptr = (char *)svptr + dataoffset;	1524	req->ptr1 = (char *)svptr + dataoffset;
554	req->callback = SvREFCNT_inc (callback);	1525	req->stroffset = dataoffset;
555		1526
556	send_req (req);	1527	if (!SvREADONLY (data))
557	}	1528	{
		1529	SvREADONLY_on (data);
		1530	req->flags |= FLAG_SV2_RO_OFF;
		1531	}
558		1532
		1533	REQ_SEND;
		1534	}
		1535	}
		1536
559	void	1537	void
		1538	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		1539	PROTOTYPE: $$;$
		1540	PPCODE:
		1541	{
		1542	SV *data;
		1543	dREQ;
		1544
		1545	data = newSV (NAME_MAX);
		1546	SvPOK_on (data);
		1547
		1548	req->type = REQ_READLINK;
		1549	req->sv1 = newSVsv (path);
		1550	req->ptr2 = SvPVbyte_nolen (req->sv1);
		1551	req->sv2 = data;
		1552	req->ptr1 = SvPVbyte_nolen (data);
		1553
		1554	REQ_SEND;
		1555	}
		1556
		1557	void
		1558	aio_sendfile (SV *out_fh, SV *in_fh, SV *in_offset, UV length, SV *callback=&PL_sv_undef)
		1559	PROTOTYPE: $$$$;$
		1560	PPCODE:
		1561	{
		1562	dREQ;
		1563
		1564	req->type = REQ_SENDFILE;
		1565	req->sv1 = newSVsv (out_fh);
		1566	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1567	req->sv2 = newSVsv (in_fh);
		1568	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1569	req->offs = SvVAL64 (in_offset);
		1570	req->size = length;
		1571
		1572	REQ_SEND;
		1573	}
		1574
		1575	void
560	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1576	aio_readahead (SV *fh, SV *offset, IV length, SV *callback=&PL_sv_undef)
561	SV * fh
562	UV offset
563	IV length
564	SV * callback
565	PROTOTYPE: $$$;$	1577	PROTOTYPE: $$$;$
566	CODE:	1578	PPCODE:
567	{	1579	{
568	aio_req req;	1580	dREQ;
569
570	if (length < 0)
571	croak ("length must not be negative");
572
573	Newz (0, req, 1, aio_cb);
574
575	if (!req)
576	croak ("out of memory during aio_req allocation");
577		1581
578	req->type = REQ_READAHEAD;	1582	req->type = REQ_READAHEAD;
579	req->fh = newSVsv (fh);	1583	req->sv1 = newSVsv (fh);
580	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1584	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
581	req->offset = offset;	1585	req->offs = SvVAL64 (offset);
582	req->length = length;	1586	req->size = length;
583	req->callback = SvREFCNT_inc (callback);
584		1587
585	send_req (req);	1588	REQ_SEND;
586	}	1589	}
587		1590
588	void	1591	void
589	aio_stat(fh_or_path,callback=&PL_sv_undef)	1592	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
590	SV * fh_or_path
591	SV * callback
592	ALIAS:	1593	ALIAS:
593	aio_stat = REQ_STAT	1594	aio_stat = REQ_STAT
594	aio_lstat = REQ_LSTAT	1595	aio_lstat = REQ_LSTAT
595	CODE:	1596	PPCODE:
596	{	1597	{
597	aio_req req;	1598	dREQ;
598		1599
599	Newz (0, req, 1, aio_cb);	1600	req->ptr2 = malloc (sizeof (Stat_t));
600
601	if (!req)	1601	if (!req->ptr2)
602	croak ("out of memory during aio_req allocation");	1602	{
603		1603	req_destroy (req);
604	New (0, req->statdata, 1, Stat_t);
605
606	if (!req->statdata)
607	croak ("out of memory during aio_req->statdata allocation");	1604	croak ("out of memory during aio_stat statdata allocation");
		1605	}
		1606
		1607	req->flags |= FLAG_PTR2_FREE;
		1608	req->sv1 = newSVsv (fh_or_path);
608		1609
609	if (SvPOK (fh_or_path))	1610	if (SvPOK (fh_or_path))
610	{	1611	{
611	req->type = ix;	1612	req->type = ix;
612	req->data = newSVsv (fh_or_path);
613	req->dataptr = SvPV_nolen (req->data);	1613	req->ptr1 = SvPVbyte_nolen (req->sv1);
614	}	1614	}
615	else	1615	else
616	{	1616	{
617	req->type = REQ_FSTAT;	1617	req->type = REQ_FSTAT;
618	req->fh = newSVsv (fh_or_path);
619	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1618	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
620	}	1619	}
621		1620
622	req->callback = SvREFCNT_inc (callback);	1621	REQ_SEND;
623
624	send_req (req);
625	}	1622	}
626		1623
627	void	1624	void
		1625	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		1626	PPCODE:
		1627	{
		1628	dREQ;
		1629
		1630	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		1631	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		1632	req->sv1 = newSVsv (fh_or_path);
		1633
		1634	if (SvPOK (fh_or_path))
		1635	{
		1636	req->type = REQ_UTIME;
		1637	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1638	}
		1639	else
		1640	{
		1641	req->type = REQ_FUTIME;
		1642	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1643	}
		1644
		1645	REQ_SEND;
		1646	}
		1647
		1648	void
		1649	aio_truncate (SV8 *fh_or_path, SV *offset, SV *callback=&PL_sv_undef)
		1650	PPCODE:
		1651	{
		1652	dREQ;
		1653
		1654	req->sv1 = newSVsv (fh_or_path);
		1655	req->offs = SvOK (offset) ? SvVAL64 (offset) : -1;
		1656
		1657	if (SvPOK (fh_or_path))
		1658	{
		1659	req->type = REQ_TRUNCATE;
		1660	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1661	}
		1662	else
		1663	{
		1664	req->type = REQ_FTRUNCATE;
		1665	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1666	}
		1667
		1668	REQ_SEND;
		1669	}
		1670
		1671	void
		1672	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		1673	PPCODE:
		1674	{
		1675	dREQ;
		1676
		1677	req->mode = mode;
		1678	req->sv1 = newSVsv (fh_or_path);
		1679
		1680	if (SvPOK (fh_or_path))
		1681	{
		1682	req->type = REQ_CHMOD;
		1683	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1684	}
		1685	else
		1686	{
		1687	req->type = REQ_FCHMOD;
		1688	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1689	}
		1690
		1691	REQ_SEND;
		1692	}
		1693
		1694	void
		1695	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		1696	PPCODE:
		1697	{
		1698	dREQ;
		1699
		1700	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		1701	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		1702	req->sv1 = newSVsv (fh_or_path);
		1703
		1704	if (SvPOK (fh_or_path))
		1705	{
		1706	req->type = REQ_CHOWN;
		1707	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1708	}
		1709	else
		1710	{
		1711	req->type = REQ_FCHOWN;
		1712	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1713	}
		1714
		1715	REQ_SEND;
		1716	}
		1717
		1718	void
628	aio_unlink(pathname,callback=&PL_sv_undef)	1719	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
629	SV * pathname	1720	ALIAS:
630	SV * callback	1721	aio_unlink = REQ_UNLINK
		1722	aio_rmdir = REQ_RMDIR
		1723	aio_readdir = REQ_READDIR
		1724	PPCODE:
		1725	{
		1726	dREQ;
		1727
		1728	req->type = ix;
		1729	req->sv1 = newSVsv (pathname);
		1730	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1731
		1732	REQ_SEND;
		1733	}
		1734
		1735	void
		1736	aio_mkdir (SV8 *pathname, int mode, SV *callback=&PL_sv_undef)
		1737	PPCODE:
		1738	{
		1739	dREQ;
		1740
		1741	req->type = REQ_MKDIR;
		1742	req->sv1 = newSVsv (pathname);
		1743	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1744	req->mode = mode;
		1745
		1746	REQ_SEND;
		1747	}
		1748
		1749	void
		1750	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
		1751	ALIAS:
		1752	aio_link = REQ_LINK
		1753	aio_symlink = REQ_SYMLINK
		1754	aio_rename = REQ_RENAME
		1755	PPCODE:
		1756	{
		1757	dREQ;
		1758
		1759	req->type = ix;
		1760	req->sv2 = newSVsv (oldpath);
		1761	req->ptr2 = SvPVbyte_nolen (req->sv2);
		1762	req->sv1 = newSVsv (newpath);
		1763	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1764
		1765	REQ_SEND;
		1766	}
		1767
		1768	void
		1769	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
		1770	PPCODE:
		1771	{
		1772	dREQ;
		1773
		1774	req->type = REQ_MKNOD;
		1775	req->sv1 = newSVsv (pathname);
		1776	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1777	req->mode = (mode_t)mode;
		1778	req->offs = dev;
		1779
		1780	REQ_SEND;
		1781	}
		1782
		1783	void
		1784	aio_busy (double delay, SV *callback=&PL_sv_undef)
		1785	PPCODE:
		1786	{
		1787	dREQ;
		1788
		1789	req->type = REQ_BUSY;
		1790	req->nv1 = delay < 0. ? 0. : delay;
		1791
		1792	REQ_SEND;
		1793	}
		1794
		1795	void
		1796	aio_group (SV *callback=&PL_sv_undef)
		1797	PROTOTYPE: ;$
		1798	PPCODE:
		1799	{
		1800	dREQ;
		1801
		1802	req->type = REQ_GROUP;
		1803
		1804	req_send (req);
		1805	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1806	}
		1807
		1808	void
		1809	aio_nop (SV *callback=&PL_sv_undef)
		1810	PPCODE:
		1811	{
		1812	dREQ;
		1813
		1814	req->type = REQ_NOP;
		1815
		1816	REQ_SEND;
		1817	}
		1818
		1819	int
		1820	aioreq_pri (int pri = 0)
		1821	PROTOTYPE: ;$
631	CODE:	1822	CODE:
632	{	1823	RETVAL = next_pri - PRI_BIAS;
633	aio_req req;	1824	if (items > 0)
634		1825	{
635	Newz (0, req, 1, aio_cb);	1826	if (pri < PRI_MIN) pri = PRI_MIN;
636		1827	if (pri > PRI_MAX) pri = PRI_MAX;
637	if (!req)	1828	next_pri = pri + PRI_BIAS;
638	croak ("out of memory during aio_req allocation");	1829	}
639		1830	OUTPUT:
640	req->type = REQ_UNLINK;	1831	RETVAL
641	req->data = newSVsv (pathname);
642	req->dataptr = SvPV_nolen (req->data);
643	req->callback = SvREFCNT_inc (callback);
644
645	send_req (req);
646	}
647		1832
648	void	1833	void
		1834	aioreq_nice (int nice = 0)
		1835	CODE:
		1836	nice = next_pri - nice;
		1837	if (nice < PRI_MIN) nice = PRI_MIN;
		1838	if (nice > PRI_MAX) nice = PRI_MAX;
		1839	next_pri = nice + PRI_BIAS;
		1840
		1841	void
649	flush()	1842	flush ()
650	PROTOTYPE:	1843	PROTOTYPE:
651	CODE:	1844	CODE:
652	while (nreqs)	1845	while (nreqs)
653	{	1846	{
654	poll_wait ();	1847	poll_wait ();
655	poll_cb ();	1848	poll_cb ();
656	}	1849	}
657		1850
658	void	1851	int
659	poll()	1852	poll()
660	PROTOTYPE:	1853	PROTOTYPE:
661	CODE:	1854	CODE:
662	if (nreqs)
663	{
664	poll_wait ();	1855	poll_wait ();
665	poll_cb ();	1856	RETVAL = poll_cb ();
666	}	1857	OUTPUT:
		1858	RETVAL
667		1859
668	int	1860	int
669	poll_fileno()	1861	poll_fileno()
670	PROTOTYPE:	1862	PROTOTYPE:
671	CODE:	1863	CODE:
…		…
683		1875
684	void	1876	void
685	poll_wait()	1877	poll_wait()
686	PROTOTYPE:	1878	PROTOTYPE:
687	CODE:	1879	CODE:
688	if (nreqs)
689	poll_wait ();	1880	poll_wait ();
		1881
		1882	void
		1883	setsig (int signum = SIGIO)
		1884	PROTOTYPE: ;$
		1885	CODE:
		1886	{
		1887	if (block_sig_level)
		1888	croak ("cannot call IO::AIO::setsig from within aio_block/callback");
		1889
		1890	X_LOCK (reslock);
		1891	main_tid = pthread_self ();
		1892	main_sig = signum;
		1893	X_UNLOCK (reslock);
		1894
		1895	if (main_sig && npending)
		1896	pthread_kill (main_tid, main_sig);
		1897	}
		1898
		1899	void
		1900	aio_block (SV *cb)
		1901	PROTOTYPE: &
		1902	PPCODE:
		1903	{
		1904	int count;
		1905
		1906	block_sig ();
		1907	PUSHMARK (SP);
		1908	PUTBACK;
		1909	count = call_sv (cb, GIMME_V | G_NOARGS | G_EVAL);
		1910	SPAGAIN;
		1911	unblock_sig ();
		1912
		1913	if (SvTRUE (ERRSV))
		1914	croak (0);
		1915
		1916	XSRETURN (count);
		1917	}
690		1918
691	int	1919	int
692	nreqs()	1920	nreqs()
693	PROTOTYPE:	1921	PROTOTYPE:
694	CODE:	1922	CODE:
695	RETVAL = nreqs;	1923	RETVAL = nreqs;
696	OUTPUT:	1924	OUTPUT:
697	RETVAL	1925	RETVAL
698		1926
		1927	int
		1928	nready()
		1929	PROTOTYPE:
		1930	CODE:
		1931	RETVAL = get_nready ();
		1932	OUTPUT:
		1933	RETVAL
		1934
		1935	int
		1936	npending()
		1937	PROTOTYPE:
		1938	CODE:
		1939	RETVAL = get_npending ();
		1940	OUTPUT:
		1941	RETVAL
		1942
		1943	int
		1944	nthreads()
		1945	PROTOTYPE:
		1946	CODE:
		1947	if (WORDACCESS_UNSAFE) X_LOCK (wrklock);
		1948	RETVAL = started;
		1949	if (WORDACCESS_UNSAFE) X_UNLOCK (wrklock);
		1950	OUTPUT:
		1951	RETVAL
		1952
		1953	PROTOTYPES: DISABLE
		1954
		1955	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1956
		1957	void
		1958	cancel (aio_req_ornot req)
		1959	CODE:
		1960	req_cancel (req);
		1961
		1962	void
		1963	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1964	CODE:
		1965	SvREFCNT_dec (req->callback);
		1966	req->callback = newSVsv (callback);
		1967
		1968	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1969
		1970	void
		1971	add (aio_req grp, ...)
		1972	PPCODE:
		1973	{
		1974	int i;
		1975	aio_req req;
		1976
		1977	if (main_sig && !block_sig_level)
		1978	croak ("aio_group->add called outside aio_block/callback context while IO::AIO::setsig is in use");
		1979
		1980	if (grp->int1 == 2)
		1981	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1982
		1983	for (i = 1; i < items; ++i )
		1984	{
		1985	if (GIMME_V != G_VOID)
		1986	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1987
		1988	req = SvAIO_REQ (ST (i));
		1989
		1990	if (req)
		1991	{
		1992	++grp->size;
		1993	req->grp = grp;
		1994
		1995	req->grp_prev = 0;
		1996	req->grp_next = grp->grp_first;
		1997
		1998	if (grp->grp_first)
		1999	grp->grp_first->grp_prev = req;
		2000
		2001	grp->grp_first = req;
		2002	}
		2003	}
		2004	}
		2005
		2006	void
		2007	cancel_subs (aio_req_ornot req)
		2008	CODE:
		2009	req_cancel_subs (req);
		2010
		2011	void
		2012	result (aio_req grp, ...)
		2013	CODE:
		2014	{
		2015	int i;
		2016	AV *av;
		2017
		2018	grp->errorno = errno;
		2019
		2020	av = newAV ();
		2021
		2022	for (i = 1; i < items; ++i )
		2023	av_push (av, newSVsv (ST (i)));
		2024
		2025	SvREFCNT_dec (grp->sv1);
		2026	grp->sv1 = (SV *)av;
		2027	}
		2028
		2029	void
		2030	errno (aio_req grp, int errorno = errno)
		2031	CODE:
		2032	grp->errorno = errorno;
		2033
		2034	void
		2035	limit (aio_req grp, int limit)
		2036	CODE:
		2037	grp->int2 = limit;
		2038	aio_grp_feed (grp);
		2039
		2040	void
		2041	feed (aio_req grp, SV *callback=&PL_sv_undef)
		2042	CODE:
		2043	{
		2044	SvREFCNT_dec (grp->sv2);
		2045	grp->sv2 = newSVsv (callback);
		2046
		2047	if (grp->int2 <= 0)
		2048	grp->int2 = 2;
		2049
		2050	aio_grp_feed (grp);
		2051	}
		2052

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