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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.29 by root, Wed Aug 17 06:12:10 2005 UTC vs.
Revision 1.99 by root, Fri Jun 1 05:51:21 2007 UTC

1	#define _REENTRANT 1	1	#include "xthread.h"
		2
2	#include <errno.h>	3	#include <errno.h>
3		4
4	#include "EXTERN.h"	5	#include "EXTERN.h"
5	#include "perl.h"	6	#include "perl.h"
6	#include "XSUB.h"	7	#include "XSUB.h"
7		8
8	#include "autoconf/config.h"	9	#include "autoconf/config.h"
9		10
		11	#include <stddef.h>
		12	#include <stdlib.h>
		13	#include <errno.h>
		14	#include <sys/time.h>
		15	#include <sys/select.h>
10	#include <sys/types.h>	16	#include <sys/types.h>
11	#include <sys/stat.h>	17	#include <sys/stat.h>
12		18	#include <limits.h>
13	#include <unistd.h>	19	#include <unistd.h>
14	#include <fcntl.h>	20	#include <fcntl.h>
15	#include <signal.h>	21	#include <signal.h>
16	#include <sched.h>	22	#include <sched.h>
17
18	#include <pthread.h>	23	#include <utime.h>
19		24
20	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	25	#if HAVE_SENDFILE
21	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	26	# if __linux
22	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	27	# include <sys/sendfile.h>
23		28	# elif __freebsd
24	#if __ia64	29	# include <sys/socket.h>
25	# define STACKSIZE 65536	30	# include <sys/uio.h>
		31	# elif __hpux
		32	# include <sys/socket.h>
		33	# elif __solaris /* not yet */
		34	# include <sys/sendfile.h>
26	#else	35	# else
27	# define STACKSIZE 4096	36	# error sendfile support requested but not available
		37	# endif
28	#endif	38	#endif
		39
		40	/* number of seconds after which idle threads exit */
		41	#define IDLE_TIMEOUT 10
		42
		43	/* used for struct dirent, AIX doesn't provide it */
		44	#ifndef NAME_MAX
		45	# define NAME_MAX 4096
		46	#endif
		47
		48	/* buffer size for various temporary buffers */
		49	#define AIO_BUFSIZE 65536
		50
		51	#define dBUF \
		52	char *aio_buf; \
		53	LOCK (wrklock); \
		54	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		55	UNLOCK (wrklock); \
		56	if (!aio_buf) \
		57	return -1;
		58
		59	typedef SV SV8; /* byte-sv, used for argument-checking */
29		60
30	enum {	61	enum {
31	REQ_QUIT,	62	REQ_QUIT,
32	REQ_OPEN, REQ_CLOSE,	63	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,	64	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		65	REQ_SENDFILE,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	66	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
		67	REQ_UTIME, REQ_FUTIME, /* must be consecutive */
		68	REQ_CHMOD, REQ_FCHMOD, /* must be consecutive */
		69	REQ_CHOWN, REQ_FCHOWN, /* must be consecutive */
35	REQ_FSYNC, REQ_FDATASYNC,	70	REQ_FSYNC, REQ_FDATASYNC,
36	REQ_UNLINK, REQ_RMDIR,	71	REQ_UNLINK, REQ_RMDIR, REQ_MKDIR, REQ_RENAME,
37	REQ_SYMLINK,	72	REQ_MKNOD, REQ_READDIR,
		73	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		74	REQ_GROUP, REQ_NOP,
		75	REQ_BUSY,
38	};	76	};
39		77
		78	#define AIO_REQ_KLASS "IO::AIO::REQ"
		79	#define AIO_GRP_KLASS "IO::AIO::GRP"
		80
40	typedef struct aio_cb {	81	typedef struct aio_cb
		82	{
41	struct aio_cb *volatile next;	83	struct aio_cb *volatile next;
42		84
		85	SV *callback;
		86	SV *sv1, *sv2;
		87	void *ptr1, *ptr2;
		88	off_t offs;
		89	size_t size;
		90	ssize_t result;
		91	double nv1, nv2;
		92
		93	STRLEN stroffset;
43	int type;	94	int type;
44		95	int int1, int2, int3;
45	int fd;	96	int errorno;
46	off_t offset;
47	size_t length;
48	ssize_t result;
49	mode_t mode; /* open */	97	mode_t mode; /* open */
50	int errorno;
51	SV *data, *callback, *fh;
52	void *dataptr, *data2ptr;
53	STRLEN dataoffset;
54		98
55	Stat_t *statdata;	99	unsigned char flags;
		100	unsigned char pri;
		101
		102	SV *self; /* the perl counterpart of this request, if any */
		103	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
56	} aio_cb;	104	} aio_cb;
57		105
		106	enum {
		107	FLAG_CANCELLED = 0x01, /* request was cancelled */
		108	FLAG_SV1_RO_OFF = 0x40, /* data was set readonly */
		109	FLAG_PTR2_FREE = 0x80, /* need to free(ptr2) */
		110	};
		111
58	typedef aio_cb *aio_req;	112	typedef aio_cb *aio_req;
		113	typedef aio_cb *aio_req_ornot;
59		114
60	static int started;	115	enum {
61	static volatile int nreqs;	116	PRI_MIN = -4,
62	static int max_outstanding = 1<<30;	117	PRI_MAX = 4,
		118
		119	DEFAULT_PRI = 0,
		120	PRI_BIAS = -PRI_MIN,
		121	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		122	};
		123
		124	#define AIO_TICKS ((1000000 + 1023) >> 10)
		125
		126	static unsigned int max_poll_time = 0;
		127	static unsigned int max_poll_reqs = 0;
		128
		129	/* calculcate time difference in ~1/AIO_TICKS of a second */
		130	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		131	{
		132	return (tv2->tv_sec - tv1->tv_sec ) * AIO_TICKS
		133	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		134	}
		135
		136	static thread_t main_tid;
		137	static int main_sig;
		138	static int block_sig_level;
		139
		140	void block_sig ()
		141	{
		142	sigset_t ss;
		143
		144	if (block_sig_level++)
		145	return;
		146
		147	if (!main_sig)
		148	return;
		149
		150	sigemptyset (&ss);
		151	sigaddset (&ss, main_sig);
		152	pthread_sigmask (SIG_BLOCK, &ss, 0);
		153	}
		154
		155	void unblock_sig ()
		156	{
		157	sigset_t ss;
		158
		159	if (--block_sig_level)
		160	return;
		161
		162	if (!main_sig)
		163	return;
		164
		165	sigemptyset (&ss);
		166	sigaddset (&ss, main_sig);
		167	pthread_sigmask (SIG_UNBLOCK, &ss, 0);
		168	}
		169
		170	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		171
		172	static unsigned int started, idle, wanted;
		173
		174	/* worker threads management */
		175	static mutex_t wrklock = MUTEX_INIT;
		176
		177	typedef struct worker {
		178	/* locked by wrklock */
		179	struct worker *prev, *next;
		180
		181	thread_t tid;
		182
		183	/* locked by reslock, reqlock or wrklock */
		184	aio_req req; /* currently processed request */
		185	void *dbuf;
		186	DIR *dirp;
		187	} worker;
		188
		189	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		190
		191	static void worker_clear (worker *wrk)
		192	{
		193	if (wrk->dirp)
		194	{
		195	closedir (wrk->dirp);
		196	wrk->dirp = 0;
		197	}
		198
		199	if (wrk->dbuf)
		200	{
		201	free (wrk->dbuf);
		202	wrk->dbuf = 0;
		203	}
		204	}
		205
		206	static void worker_free (worker *wrk)
		207	{
		208	wrk->next->prev = wrk->prev;
		209	wrk->prev->next = wrk->next;
		210
		211	free (wrk);
		212	}
		213
		214	static volatile unsigned int nreqs, nready, npending;
		215	static volatile unsigned int max_idle = 4;
		216	static volatile unsigned int max_outstanding = 0xffffffff;
63	static int respipe [2];	217	static int respipe [2];
64		218
65	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	219	static mutex_t reslock = MUTEX_INIT;
66	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	220	static mutex_t reqlock = MUTEX_INIT;
67	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	221	static cond_t reqwait = COND_INIT;
68		222
69	static volatile aio_req reqs, reqe; /* queue start, queue end */	223	#if WORDACCESS_UNSAFE
70	static volatile aio_req ress, rese; /* queue start, queue end */
71		224
72	static void free_req (aio_req req)	225	static unsigned int get_nready ()
73	{	226	{
74	if (req->data)	227	unsigned int retval;
75	SvREFCNT_dec (req->data);
76		228
77	if (req->fh)	229	LOCK (reqlock);
78	SvREFCNT_dec (req->fh);	230	retval = nready;
		231	UNLOCK (reqlock);
79		232
80	if (req->statdata)	233	return retval;
81	Safefree (req->statdata);
82
83	if (req->callback)
84	SvREFCNT_dec (req->callback);
85
86	Safefree (req);
87	}	234	}
88		235
89	static void	236	static unsigned int get_npending ()
90	poll_wait ()
91	{	237	{
92	if (nreqs && !ress)	238	unsigned int retval;
		239
		240	LOCK (reslock);
		241	retval = npending;
		242	UNLOCK (reslock);
		243
		244	return retval;
		245	}
		246
		247	static unsigned int get_nthreads ()
		248	{
		249	unsigned int retval;
		250
		251	LOCK (wrklock);
		252	retval = started;
		253	UNLOCK (wrklock);
		254
		255	return retval;
		256	}
		257
		258	#else
		259
		260	# define get_nready() nready
		261	# define get_npending() npending
		262	# define get_nthreads() started
		263
		264	#endif
		265
		266	/*
		267	* a somewhat faster data structure might be nice, but
		268	* with 8 priorities this actually needs <20 insns
		269	* per shift, the most expensive operation.
		270	*/
		271	typedef struct {
		272	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		273	int size;
		274	} reqq;
		275
		276	static reqq req_queue;
		277	static reqq res_queue;
		278
		279	int reqq_push (reqq *q, aio_req req)
		280	{
		281	int pri = req->pri;
		282	req->next = 0;
		283
		284	if (q->qe[pri])
93	{	285	{
94	fd_set rfd;	286	q->qe[pri]->next = req;
95	FD_ZERO(&rfd);	287	q->qe[pri] = req;
96	FD_SET(respipe [0], &rfd);
97
98	select (respipe [0] + 1, &rfd, 0, 0, 0);
99	}	288	}
100	}	289	else
		290	q->qe[pri] = q->qs[pri] = req;
101		291
102	static int	292	return q->size++;
103	poll_cb ()	293	}
104	{
105	dSP;
106	int count = 0;
107	int do_croak = 0;
108	aio_req req;
109		294
110	for (;;)	295	aio_req reqq_shift (reqq *q)
		296	{
		297	int pri;
		298
		299	if (!q->size)
		300	return 0;
		301
		302	--q->size;
		303
		304	for (pri = NUM_PRI; pri--; )
111	{	305	{
112	pthread_mutex_lock (&reslock);	306	aio_req req = q->qs[pri];
113	req = ress;
114		307
115	if (req)	308	if (req)
116	{	309	{
117	ress = req->next;	310	if (!(q->qs[pri] = req->next))
		311	q->qe[pri] = 0;
118		312
119	if (!ress)	313	return req;
		314	}
		315	}
		316
		317	abort ();
		318	}
		319
		320	static int poll_cb ();
		321	static int req_invoke (aio_req req);
		322	static void req_free (aio_req req);
		323	static void req_cancel (aio_req req);
		324
		325	/* must be called at most once */
		326	static SV *req_sv (aio_req req, const char *klass)
		327	{
		328	if (!req->self)
		329	{
		330	req->self = (SV *)newHV ();
		331	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		332	}
		333
		334	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		335	}
		336
		337	static aio_req SvAIO_REQ (SV *sv)
		338	{
		339	MAGIC *mg;
		340
		341	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		342	croak ("object of class " AIO_REQ_KLASS " expected");
		343
		344	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		345
		346	return mg ? (aio_req)mg->mg_ptr : 0;
		347	}
		348
		349	static void aio_grp_feed (aio_req grp)
		350	{
		351	block_sig ();
		352
		353	while (grp->size < grp->int2 && !(grp->flags & FLAG_CANCELLED))
		354	{
		355	int old_len = grp->size;
		356
		357	if (grp->sv2 && SvOK (grp->sv2))
		358	{
		359	dSP;
		360
		361	ENTER;
		362	SAVETMPS;
		363	PUSHMARK (SP);
		364	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		365	PUTBACK;
		366	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		367	SPAGAIN;
		368	FREETMPS;
		369	LEAVE;
		370	}
		371
		372	/* stop if no progress has been made */
		373	if (old_len == grp->size)
		374	{
		375	SvREFCNT_dec (grp->sv2);
		376	grp->sv2 = 0;
		377	break;
		378	}
		379	}
		380
		381	unblock_sig ();
		382	}
		383
		384	static void aio_grp_dec (aio_req grp)
		385	{
		386	--grp->size;
		387
		388	/* call feeder, if applicable */
		389	aio_grp_feed (grp);
		390
		391	/* finish, if done */
		392	if (!grp->size && grp->int1)
		393	{
		394	block_sig ();
		395
		396	if (!req_invoke (grp))
		397	{
		398	req_free (grp);
		399	unblock_sig ();
		400	croak (0);
		401	}
		402
		403	req_free (grp);
		404	unblock_sig ();
		405	}
		406	}
		407
		408	static int req_invoke (aio_req req)
		409	{
		410	dSP;
		411
		412	if (req->flags & FLAG_SV1_RO_OFF)
		413	SvREADONLY_off (req->sv1);
		414
		415	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		416	{
		417	ENTER;
		418	SAVETMPS;
		419	PUSHMARK (SP);
		420	EXTEND (SP, 1);
		421
		422	switch (req->type)
		423	{
		424	case REQ_READDIR:
120	{	425	{
121	rese = 0;	426	SV *rv = &PL_sv_undef;
122		427
123	/* read any signals sent by the worker threads */	428	if (req->result >= 0)
124	char buf [32];
125	while (read (respipe [0], buf, 32) == 32)
126	;	429	{
		430	int i;
		431	char *buf = req->ptr2;
		432	AV *av = newAV ();
		433
		434	av_extend (av, req->result - 1);
		435
		436	for (i = 0; i < req->result; ++i)
		437	{
		438	SV *sv = newSVpv (buf, 0);
		439
		440	av_store (av, i, sv);
		441	buf += SvCUR (sv) + 1;
		442	}
		443
		444	rv = sv_2mortal (newRV_noinc ((SV *)av));
		445	}
		446
		447	PUSHs (rv);
127	}	448	}
128	}
129
130	pthread_mutex_unlock (&reslock);
131
132	if (!req)
133	break;	449	break;
134		450
135	nreqs--;	451	case REQ_OPEN:
136
137	if (req->type == REQ_QUIT)
138	started--;
139	else
140	{
141	int errorno = errno;
142	errno = req->errorno;
143
144	if (req->type == REQ_READ)
145	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
146
147	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
148	SvREADONLY_off (req->data);
149
150	if (req->statdata)
151	{
152	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
153	PL_laststatval = req->result;
154	PL_statcache = *(req->statdata);
155	}
156
157	ENTER;
158	PUSHMARK (SP);
159	XPUSHs (sv_2mortal (newSViv (req->result)));
160
161	if (req->type == REQ_OPEN)
162	{	452	{
163	/* convert fd to fh */	453	/* convert fd to fh */
164	SV *fh;	454	SV *fh;
165		455
		456	PUSHs (sv_2mortal (newSViv (req->result)));
166	PUTBACK;	457	PUTBACK;
167	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	458	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
168	SPAGAIN;	459	SPAGAIN;
169		460
170	fh = SvREFCNT_inc (POPs);	461	fh = POPs;
171
172	PUSHMARK (SP);	462	PUSHMARK (SP);
173	XPUSHs (sv_2mortal (fh));	463	XPUSHs (fh);
174	}	464	}
		465	break;
175		466
176	if (SvOK (req->callback))	467	case REQ_GROUP:
		468	req->int1 = 2; /* mark group as finished */
		469
		470	if (req->sv1)
		471	{
		472	int i;
		473	AV *av = (AV *)req->sv1;
		474
		475	EXTEND (SP, AvFILL (av) + 1);
		476	for (i = 0; i <= AvFILL (av); ++i)
		477	PUSHs (*av_fetch (av, i, 0));
		478	}
		479	break;
		480
		481	case REQ_NOP:
		482	case REQ_BUSY:
		483	break;
		484
		485	case REQ_READLINK:
		486	if (req->result > 0)
		487	{
		488	SvCUR_set (req->sv2, req->result);
		489	*SvEND (req->sv2) = 0;
		490	PUSHs (req->sv2);
		491	}
		492	break;
		493
		494	case REQ_STAT:
		495	case REQ_LSTAT:
		496	case REQ_FSTAT:
		497	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		498	PL_laststatval = req->result;
		499	PL_statcache = *(Stat_t *)(req->ptr2);
		500	PUSHs (sv_2mortal (newSViv (req->result)));
		501	break;
		502
		503	case REQ_READ:
		504	SvCUR_set (req->sv2, req->stroffset + (req->result > 0 ? req->result : 0));
		505	*SvEND (req->sv2) = 0;
		506	PUSHs (sv_2mortal (newSViv (req->result)));
		507	break;
		508
		509	default:
		510	PUSHs (sv_2mortal (newSViv (req->result)));
		511	break;
		512	}
		513
		514	errno = req->errorno;
		515
		516	PUTBACK;
		517	call_sv (req->callback, G_VOID | G_EVAL);
		518	SPAGAIN;
		519
		520	FREETMPS;
		521	LEAVE;
		522	}
		523
		524	if (req->grp)
		525	{
		526	aio_req grp = req->grp;
		527
		528	/* unlink request */
		529	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		530	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		531
		532	if (grp->grp_first == req)
		533	grp->grp_first = req->grp_next;
		534
		535	aio_grp_dec (grp);
		536	}
		537
		538	return !SvTRUE (ERRSV);
		539	}
		540
		541	static void req_free (aio_req req)
		542	{
		543	if (req->self)
		544	{
		545	sv_unmagic (req->self, PERL_MAGIC_ext);
		546	SvREFCNT_dec (req->self);
		547	}
		548
		549	SvREFCNT_dec (req->sv1);
		550	SvREFCNT_dec (req->sv2);
		551	SvREFCNT_dec (req->callback);
		552
		553	if (req->flags & FLAG_PTR2_FREE)
		554	free (req->ptr2);
		555
		556	Safefree (req);
		557	}
		558
		559	static void req_cancel_subs (aio_req grp)
		560	{
		561	aio_req sub;
		562
		563	if (grp->type != REQ_GROUP)
		564	return;
		565
		566	SvREFCNT_dec (grp->sv2);
		567	grp->sv2 = 0;
		568
		569	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		570	req_cancel (sub);
		571	}
		572
		573	static void req_cancel (aio_req req)
		574	{
		575	req->flags |= FLAG_CANCELLED;
		576
		577	req_cancel_subs (req);
		578	}
		579
		580	static void *aio_proc(void *arg);
		581
		582	static void start_thread (void)
		583	{
		584	worker *wrk = calloc (1, sizeof (worker));
		585
		586	if (!wrk)
		587	croak ("unable to allocate worker thread data");
		588
		589	LOCK (wrklock);
		590
		591	if (thread_create (&wrk->tid, aio_proc, (void *)wrk))
		592	{
		593	wrk->prev = &wrk_first;
		594	wrk->next = wrk_first.next;
		595	wrk_first.next->prev = wrk;
		596	wrk_first.next = wrk;
		597	++started;
		598	}
		599	else
		600	free (wrk);
		601
		602	UNLOCK (wrklock);
		603	}
		604
		605	static void maybe_start_thread ()
		606	{
		607	if (get_nthreads () >= wanted)
		608	return;
		609
		610	/* todo: maybe use idle here, but might be less exact */
		611	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		612	return;
		613
		614	start_thread ();
		615	}
		616
		617	static void req_send (aio_req req)
		618	{
		619	block_sig ();
		620
		621	++nreqs;
		622
		623	LOCK (reqlock);
		624	++nready;
		625	reqq_push (&req_queue, req);
		626	COND_SIGNAL (reqwait);
		627	UNLOCK (reqlock);
		628
		629	unblock_sig ();
		630
		631	maybe_start_thread ();
		632	}
		633
		634	static void end_thread (void)
		635	{
		636	aio_req req;
		637
		638	Newz (0, req, 1, aio_cb);
		639
		640	req->type = REQ_QUIT;
		641	req->pri = PRI_MAX + PRI_BIAS;
		642
		643	LOCK (reqlock);
		644	reqq_push (&req_queue, req);
		645	COND_SIGNAL (reqwait);
		646	UNLOCK (reqlock);
		647
		648	LOCK (wrklock);
		649	--started;
		650	UNLOCK (wrklock);
		651	}
		652
		653	static void set_max_idle (int nthreads)
		654	{
		655	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		656	max_idle = nthreads <= 0 ? 1 : nthreads;
		657	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
		658	}
		659
		660	static void min_parallel (int nthreads)
		661	{
		662	if (wanted < nthreads)
		663	wanted = nthreads;
		664	}
		665
		666	static void max_parallel (int nthreads)
		667	{
		668	if (wanted > nthreads)
		669	wanted = nthreads;
		670
		671	while (started > wanted)
		672	end_thread ();
		673	}
		674
		675	static void poll_wait ()
		676	{
		677	fd_set rfd;
		678
		679	while (nreqs)
		680	{
		681	int size;
		682	if (WORDACCESS_UNSAFE) LOCK (reslock);
		683	size = res_queue.size;
		684	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		685
		686	if (size)
		687	return;
		688
		689	maybe_start_thread ();
		690
		691	FD_ZERO(&rfd);
		692	FD_SET(respipe [0], &rfd);
		693
		694	select (respipe [0] + 1, &rfd, 0, 0, 0);
		695	}
		696	}
		697
		698	static int poll_cb ()
		699	{
		700	dSP;
		701	int count = 0;
		702	int maxreqs = max_poll_reqs;
		703	int do_croak = 0;
		704	struct timeval tv_start, tv_now;
		705	aio_req req;
		706
		707	if (max_poll_time)
		708	gettimeofday (&tv_start, 0);
		709
		710	block_sig ();
		711
		712	for (;;)
		713	{
		714	for (;;)
		715	{
		716	maybe_start_thread ();
		717
		718	LOCK (reslock);
		719	req = reqq_shift (&res_queue);
		720
		721	if (req)
177	{	722	{
178	PUTBACK;	723	--npending;
179	call_sv (req->callback, G_VOID | G_EVAL);
180	SPAGAIN;
181		724
182	if (SvTRUE (ERRSV))	725	if (!res_queue.size)
183	{	726	{
		727	/* read any signals sent by the worker threads */
		728	char buf [4];
		729	while (read (respipe [0], buf, 4) == 4)
		730	;
		731	}
		732	}
		733
		734	UNLOCK (reslock);
		735
		736	if (!req)
		737	break;
		738
		739	--nreqs;
		740
		741	if (req->type == REQ_GROUP && req->size)
		742	{
		743	req->int1 = 1; /* mark request as delayed */
		744	continue;
		745	}
		746	else
		747	{
		748	if (!req_invoke (req))
		749	{
184	free_req (req);	750	req_free (req);
		751	unblock_sig ();
185	croak (0);	752	croak (0);
186	}	753	}
		754
		755	count++;
187	}	756	}
188		757
189	LEAVE;	758	req_free (req);
190		759
191	errno = errorno;	760	if (maxreqs && !--maxreqs)
192	count++;	761	break;
		762
		763	if (max_poll_time)
		764	{
		765	gettimeofday (&tv_now, 0);
		766
		767	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
		768	break;
		769	}
193	}	770	}
194		771
195	free_req (req);	772	if (nreqs <= max_outstanding)
		773	break;
		774
		775	poll_wait ();
		776
		777	++maxreqs;
196	}	778	}
197		779
		780	unblock_sig ();
198	return count;	781	return count;
199	}
200
201	static void *aio_proc(void *arg);
202
203	static void
204	start_thread (void)
205	{
206	sigset_t fullsigset, oldsigset;
207	pthread_t tid;
208	pthread_attr_t attr;
209
210	pthread_attr_init (&attr);
211	pthread_attr_setstacksize (&attr, STACKSIZE);
212	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
213
214	sigfillset (&fullsigset);
215	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
216
217	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
218	started++;
219
220	sigprocmask (SIG_SETMASK, &oldsigset, 0);
221	}
222
223	static void
224	send_req (aio_req req)
225	{
226	nreqs++;
227
228	pthread_mutex_lock (&reqlock);
229
230	req->next = 0;
231
232	if (reqe)
233	{
234	reqe->next = req;
235	reqe = req;
236	}
237	else
238	reqe = reqs = req;
239
240	pthread_cond_signal (&reqwait);
241	pthread_mutex_unlock (&reqlock);
242
243	if (nreqs > max_outstanding)
244	for (;;)
245	{
246	poll_cb ();
247
248	if (nreqs <= max_outstanding)
249	break;
250
251	poll_wait ();
252	}
253	}
254
255	static void
256	end_thread (void)
257	{
258	aio_req req;
259	Newz (0, req, 1, aio_cb);
260	req->type = REQ_QUIT;
261
262	send_req (req);
263	}
264
265	static void min_parallel (int nthreads)
266	{
267	while (nthreads > started)
268	start_thread ();
269	}
270
271	static void max_parallel (int nthreads)
272	{
273	int cur = started;
274
275	while (cur > nthreads)
276	{
277	end_thread ();
278	cur--;
279	}
280
281	while (started > nthreads)
282	{
283	poll_wait ();
284	poll_cb ();
285	}
286	}	782	}
287		783
288	static void create_pipe ()	784	static void create_pipe ()
289	{	785	{
290	if (pipe (respipe))	786	if (pipe (respipe))
…		…
293	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	789	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
294	croak ("cannot set result pipe to nonblocking mode");	790	croak ("cannot set result pipe to nonblocking mode");
295		791
296	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	792	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
297	croak ("cannot set result pipe to nonblocking mode");	793	croak ("cannot set result pipe to nonblocking mode");
298	}
299
300	static void atfork_prepare (void)
301	{
302	pthread_mutex_lock (&reqlock);
303	pthread_mutex_lock (&reslock);
304	}
305
306	static void atfork_parent (void)
307	{
308	pthread_mutex_unlock (&reslock);
309	pthread_mutex_unlock (&reqlock);
310	}
311
312	static void atfork_child (void)
313	{
314	aio_req prv;
315
316	int restart = started;
317	started = 0;
318
319	while (reqs)
320	{
321	prv = reqs;
322	reqs = prv->next;
323	free_req (prv);
324	}
325
326	reqs = reqe = 0;
327
328	while (ress)
329	{
330	prv = ress;
331	ress = prv->next;
332	free_req (prv);
333	}
334
335	ress = rese = 0;
336
337	close (respipe [0]);
338	close (respipe [1]);
339	create_pipe ();
340
341	atfork_parent ();
342
343	min_parallel (restart);
344	}	794	}
345		795
346	/*****************************************************************************/	796	/*****************************************************************************/
347	/* work around various missing functions */	797	/* work around various missing functions */
348		798
…		…
353	/*	803	/*
354	* make our pread/pwrite safe against themselves, but not against	804	* make our pread/pwrite safe against themselves, but not against
355	* normal read/write by using a mutex. slows down execution a lot,	805	* normal read/write by using a mutex. slows down execution a lot,
356	* but that's your problem, not mine.	806	* but that's your problem, not mine.
357	*/	807	*/
358	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	808	static mutex_t preadwritelock = MUTEX_INIT;
359		809
360	static ssize_t	810	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
361	pread (int fd, void *buf, size_t count, off_t offset)
362	{	811	{
363	ssize_t res;	812	ssize_t res;
364	off_t ooffset;	813	off_t ooffset;
365		814
366	pthread_mutex_lock (&iolock);	815	LOCK (preadwritelock);
367	ooffset = lseek (fd, 0, SEEK_CUR);	816	ooffset = lseek (fd, 0, SEEK_CUR);
368	lseek (fd, offset, SEEK_SET);	817	lseek (fd, offset, SEEK_SET);
369	res = read (fd, buf, count);	818	res = read (fd, buf, count);
370	lseek (fd, ooffset, SEEK_SET);	819	lseek (fd, ooffset, SEEK_SET);
371	pthread_mutex_unlock (&iolock);	820	UNLOCK (preadwritelock);
372		821
373	return res;	822	return res;
374	}	823	}
375		824
376	static ssize_t
377	pwrite (int fd, void *buf, size_t count, off_t offset)	825	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
378	{	826	{
379	ssize_t res;	827	ssize_t res;
380	off_t ooffset;	828	off_t ooffset;
381		829
382	pthread_mutex_lock (&iolock);	830	LOCK (preadwritelock);
383	ooffset = lseek (fd, 0, SEEK_CUR);	831	ooffset = lseek (fd, 0, SEEK_CUR);
384	lseek (fd, offset, SEEK_SET);	832	lseek (fd, offset, SEEK_SET);
385	res = write (fd, buf, count);	833	res = write (fd, buf, count);
386	lseek (fd, offset, SEEK_SET);	834	lseek (fd, offset, SEEK_SET);
387	pthread_mutex_unlock (&iolock);	835	UNLOCK (preadwritelock);
388		836
389	return res;	837	return res;
390	}	838	}
		839	#endif
		840
		841	#ifndef HAVE_FUTIMES
		842
		843	# define utimes(path,times) aio_utimes (path, times)
		844	# define futimes(fd,times) aio_futimes (fd, times)
		845
		846	int aio_utimes (const char *filename, const struct timeval times[2])
		847	{
		848	if (times)
		849	{
		850	struct utimbuf buf;
		851
		852	buf.actime = times[0].tv_sec;
		853	buf.modtime = times[1].tv_sec;
		854
		855	return utime (filename, &buf);
		856	}
		857	else
		858	return utime (filename, 0);
		859	}
		860
		861	int aio_futimes (int fd, const struct timeval tv[2])
		862	{
		863	errno = ENOSYS;
		864	return -1;
		865	}
		866
391	#endif	867	#endif
392		868
393	#if !HAVE_FDATASYNC	869	#if !HAVE_FDATASYNC
394	# define fdatasync fsync	870	# define fdatasync fsync
395	#endif	871	#endif
396		872
397	#if !HAVE_READAHEAD	873	#if !HAVE_READAHEAD
398	# define readahead aio_readahead	874	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
399		875
400	static char readahead_buf[4096];	876	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
401
402	static ssize_t
403	readahead (int fd, off_t offset, size_t count)
404	{	877	{
		878	dBUF;
		879
405	while (count > 0)	880	while (count > 0)
406	{	881	{
407	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	882	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
408		883
409	pread (fd, readahead_buf, len, offset);	884	pread (fd, aio_buf, len, offset);
410	offset += len;	885	offset += len;
411	count -= len;	886	count -= len;
412	}	887	}
413		888
414	errno = 0;	889	errno = 0;
415	}	890	}
		891
416	#endif	892	#endif
417		893
		894	#if !HAVE_READDIR_R
		895	# define readdir_r aio_readdir_r
		896
		897	static mutex_t readdirlock = MUTEX_INIT;
		898
		899	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		900	{
		901	struct dirent *e;
		902	int errorno;
		903
		904	LOCK (readdirlock);
		905
		906	e = readdir (dirp);
		907	errorno = errno;
		908
		909	if (e)
		910	{
		911	*res = ent;
		912	strcpy (ent->d_name, e->d_name);
		913	}
		914	else
		915	*res = 0;
		916
		917	UNLOCK (readdirlock);
		918
		919	errno = errorno;
		920	return e ? 0 : -1;
		921	}
		922	#endif
		923
		924	/* sendfile always needs emulation */
		925	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
		926	{
		927	ssize_t res;
		928
		929	if (!count)
		930	return 0;
		931
		932	#if HAVE_SENDFILE
		933	# if __linux
		934	res = sendfile (ofd, ifd, &offset, count);
		935
		936	# elif __freebsd
		937	/*
		938	* Of course, the freebsd sendfile is a dire hack with no thoughts
		939	* wasted on making it similar to other I/O functions.
		940	*/
		941	{
		942	off_t sbytes;
		943	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		944
		945	if (res < 0 && sbytes)
		946	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
		947	res = sbytes;
		948	}
		949
		950	# elif __hpux
		951	res = sendfile (ofd, ifd, offset, count, 0, 0);
		952
		953	# elif __solaris
		954	{
		955	struct sendfilevec vec;
		956	size_t sbytes;
		957
		958	vec.sfv_fd = ifd;
		959	vec.sfv_flag = 0;
		960	vec.sfv_off = offset;
		961	vec.sfv_len = count;
		962
		963	res = sendfilev (ofd, &vec, 1, &sbytes);
		964
		965	if (res < 0 && sbytes)
		966	res = sbytes;
		967	}
		968
		969	# endif
		970	#else
		971	res = -1;
		972	errno = ENOSYS;
		973	#endif
		974
		975	if (res < 0
		976	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		977	#if __solaris
		978	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		979	#endif
		980	)
		981	)
		982	{
		983	/* emulate sendfile. this is a major pain in the ass */
		984	dBUF;
		985
		986	res = 0;
		987
		988	while (count)
		989	{
		990	ssize_t cnt;
		991
		992	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
		993
		994	if (cnt <= 0)
		995	{
		996	if (cnt && !res) res = -1;
		997	break;
		998	}
		999
		1000	cnt = write (ofd, aio_buf, cnt);
		1001
		1002	if (cnt <= 0)
		1003	{
		1004	if (cnt && !res) res = -1;
		1005	break;
		1006	}
		1007
		1008	offset += cnt;
		1009	res += cnt;
		1010	count -= cnt;
		1011	}
		1012	}
		1013
		1014	return res;
		1015	}
		1016
		1017	/* read a full directory */
		1018	static void scandir_ (aio_req req, worker *self)
		1019	{
		1020	DIR *dirp;
		1021	union
		1022	{
		1023	struct dirent d;
		1024	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		1025	} *u;
		1026	struct dirent *entp;
		1027	char *name, *names;
		1028	int memlen = 4096;
		1029	int memofs = 0;
		1030	int res = 0;
		1031	int errorno;
		1032
		1033	LOCK (wrklock);
		1034	self->dirp = dirp = opendir (req->ptr1);
		1035	self->dbuf = u = malloc (sizeof (*u));
		1036	req->flags |= FLAG_PTR2_FREE;
		1037	req->ptr2 = names = malloc (memlen);
		1038	UNLOCK (wrklock);
		1039
		1040	if (dirp && u && names)
		1041	for (;;)
		1042	{
		1043	errno = 0;
		1044	readdir_r (dirp, &u->d, &entp);
		1045
		1046	if (!entp)
		1047	break;
		1048
		1049	name = entp->d_name;
		1050
		1051	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1052	{
		1053	int len = strlen (name) + 1;
		1054
		1055	res++;
		1056
		1057	while (memofs + len > memlen)
		1058	{
		1059	memlen *= 2;
		1060	LOCK (wrklock);
		1061	req->ptr2 = names = realloc (names, memlen);
		1062	UNLOCK (wrklock);
		1063
		1064	if (!names)
		1065	break;
		1066	}
		1067
		1068	memcpy (names + memofs, name, len);
		1069	memofs += len;
		1070	}
		1071	}
		1072
		1073	if (errno)
		1074	res = -1;
		1075
		1076	req->result = res;
		1077	}
		1078
418	/*****************************************************************************/	1079	/*****************************************************************************/
419		1080
420	static void *
421	aio_proc (void *thr_arg)	1081	static void *aio_proc (void *thr_arg)
422	{	1082	{
423	aio_req req;	1083	aio_req req;
424	int type;	1084	struct timespec ts;
		1085	worker *self = (worker *)thr_arg;
425		1086
426	do	1087	/* try to distribute timeouts somewhat evenly */
		1088	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1089	* (1000000000UL / 1024UL);
		1090
		1091	for (;;)
427	{	1092	{
428	pthread_mutex_lock (&reqlock);	1093	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1094
		1095	LOCK (reqlock);
429		1096
430	for (;;)	1097	for (;;)
431	{	1098	{
432	req = reqs;	1099	self->req = req = reqq_shift (&req_queue);
433
434	if (reqs)
435	{
436	reqs = reqs->next;
437	if (!reqs) reqe = 0;
438	}
439		1100
440	if (req)	1101	if (req)
441	break;	1102	break;
442		1103
443	pthread_cond_wait (&reqwait, &reqlock);	1104	++idle;
		1105
		1106	if (COND_TIMEDWAIT (reqwait, reqlock, ts)
		1107	== ETIMEDOUT)
		1108	{
		1109	if (idle > max_idle)
		1110	{
		1111	--idle;
		1112	UNLOCK (reqlock);
		1113	LOCK (wrklock);
		1114	--started;
		1115	UNLOCK (wrklock);
		1116	goto quit;
		1117	}
		1118
		1119	/* we are allowed to idle, so do so without any timeout */
		1120	COND_WAIT (reqwait, reqlock);
		1121	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1122	}
		1123
		1124	--idle;
444	}	1125	}
445		1126
446	pthread_mutex_unlock (&reqlock);	1127	--nready;
		1128
		1129	UNLOCK (reqlock);
447		1130
448	errno = 0; /* strictly unnecessary */	1131	errno = 0; /* strictly unnecessary */
449		1132
450	type = req->type;	1133	if (!(req->flags & FLAG_CANCELLED))
451
452	switch (type)	1134	switch (req->type)
		1135	{
		1136	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
		1137	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
		1138
		1139	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
		1140	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
		1141
		1142	case REQ_STAT: req->result = stat (req->ptr1, (Stat_t *)req->ptr2); break;
		1143	case REQ_LSTAT: req->result = lstat (req->ptr1, (Stat_t *)req->ptr2); break;
		1144	case REQ_FSTAT: req->result = fstat (req->int1, (Stat_t *)req->ptr2); break;
		1145
		1146	case REQ_CHOWN: req->result = chown (req->ptr1, req->int2, req->int3); break;
		1147	case REQ_FCHOWN: req->result = fchown (req->int1, req->int2, req->int3); break;
		1148	case REQ_CHMOD: req->result = chmod (req->ptr1, req->mode); break;
		1149	case REQ_FCHMOD: req->result = fchmod (req->int1, req->mode); break;
		1150
		1151	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
		1152	case REQ_CLOSE: req->result = close (req->int1); break;
		1153	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
		1154	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
		1155	case REQ_MKDIR: req->result = mkdir (req->ptr1, req->mode); break;
		1156	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
		1157	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
		1158	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1159	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1160	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
		1161
		1162	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
		1163	case REQ_FSYNC: req->result = fsync (req->int1); break;
		1164	case REQ_READDIR: scandir_ (req, self); break;
		1165
		1166	case REQ_BUSY:
		1167	{
		1168	struct timeval tv;
		1169
		1170	tv.tv_sec = req->nv1;
		1171	tv.tv_usec = (req->nv1 - tv.tv_usec) * 1000000.;
		1172
		1173	req->result = select (0, 0, 0, 0, &tv);
		1174	}
		1175
		1176	case REQ_UTIME:
		1177	case REQ_FUTIME:
		1178	{
		1179	struct timeval tv[2];
		1180	struct timeval *times;
		1181
		1182	if (req->nv1 != -1. || req->nv2 != -1.)
		1183	{
		1184	tv[0].tv_sec = req->nv1;
		1185	tv[0].tv_usec = (req->nv1 - tv[0].tv_sec) * 1000000.;
		1186	tv[1].tv_sec = req->nv2;
		1187	tv[1].tv_usec = (req->nv2 - tv[1].tv_sec) * 1000000.;
		1188
		1189	times = tv;
		1190	}
		1191	else
		1192	times = 0;
		1193
		1194
		1195	req->result = req->type == REQ_FUTIME
		1196	? futimes (req->int1, times)
		1197	: utimes (req->ptr1, times);
		1198	}
		1199
		1200	case REQ_GROUP:
		1201	case REQ_NOP:
		1202	break;
		1203
		1204	case REQ_QUIT:
		1205	goto quit;
		1206
		1207	default:
		1208	req->result = -1;
		1209	break;
		1210	}
		1211
		1212	req->errorno = errno;
		1213
		1214	LOCK (reslock);
		1215
		1216	++npending;
		1217
		1218	if (!reqq_push (&res_queue, req))
453	{	1219	{
454	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
455	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
456
457	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
458
459	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
460	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
461	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
462
463	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
464	case REQ_CLOSE: req->result = close (req->fd); break;
465	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
466	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
467	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
468
469	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
470	case REQ_FSYNC: req->result = fsync (req->fd); break;
471
472	case REQ_QUIT:
473	break;
474
475	default:
476	req->result = ENOSYS;
477	break;
478	}
479
480	req->errorno = errno;
481
482	pthread_mutex_lock (&reslock);
483
484	req->next = 0;
485
486	if (rese)
487	{
488	rese->next = req;
489	rese = req;
490	}
491	else
492	{
493	rese = ress = req;
494
495	/* write a dummy byte to the pipe so fh becomes ready */	1220	/* write a dummy byte to the pipe so fh becomes ready */
496	write (respipe [1], &respipe, 1);	1221	write (respipe [1], &respipe, 1);
		1222
		1223	/* optionally signal the main thread asynchronously */
		1224	if (main_sig)
		1225	pthread_kill (main_tid, main_sig);
497	}	1226	}
498		1227
499	pthread_mutex_unlock (&reslock);	1228	self->req = 0;
		1229	worker_clear (self);
		1230
		1231	UNLOCK (reslock);
500	}	1232	}
501	while (type != REQ_QUIT);	1233
		1234	quit:
		1235	LOCK (wrklock);
		1236	worker_free (self);
		1237	UNLOCK (wrklock);
502		1238
503	return 0;	1239	return 0;
		1240	}
		1241
		1242	/*****************************************************************************/
		1243
		1244	static void atfork_prepare (void)
		1245	{
		1246	LOCK (wrklock);
		1247	LOCK (reqlock);
		1248	LOCK (reslock);
		1249	#if !HAVE_PREADWRITE
		1250	LOCK (preadwritelock);
		1251	#endif
		1252	#if !HAVE_READDIR_R
		1253	LOCK (readdirlock);
		1254	#endif
		1255	}
		1256
		1257	static void atfork_parent (void)
		1258	{
		1259	#if !HAVE_READDIR_R
		1260	UNLOCK (readdirlock);
		1261	#endif
		1262	#if !HAVE_PREADWRITE
		1263	UNLOCK (preadwritelock);
		1264	#endif
		1265	UNLOCK (reslock);
		1266	UNLOCK (reqlock);
		1267	UNLOCK (wrklock);
		1268	}
		1269
		1270	static void atfork_child (void)
		1271	{
		1272	aio_req prv;
		1273
		1274	while (prv = reqq_shift (&req_queue))
		1275	req_free (prv);
		1276
		1277	while (prv = reqq_shift (&res_queue))
		1278	req_free (prv);
		1279
		1280	while (wrk_first.next != &wrk_first)
		1281	{
		1282	worker *wrk = wrk_first.next;
		1283
		1284	if (wrk->req)
		1285	req_free (wrk->req);
		1286
		1287	worker_clear (wrk);
		1288	worker_free (wrk);
		1289	}
		1290
		1291	started = 0;
		1292	idle = 0;
		1293	nreqs = 0;
		1294	nready = 0;
		1295	npending = 0;
		1296
		1297	close (respipe [0]);
		1298	close (respipe [1]);
		1299	create_pipe ();
		1300
		1301	atfork_parent ();
504	}	1302	}
505		1303
506	#define dREQ \	1304	#define dREQ \
507	aio_req req; \	1305	aio_req req; \
		1306	int req_pri = next_pri; \
		1307	next_pri = DEFAULT_PRI + PRI_BIAS; \
508	\	1308	\
509	if (SvOK (callback) && !SvROK (callback)) \	1309	if (SvOK (callback) && !SvROK (callback)) \
510	croak ("clalback must be undef or of reference type"); \	1310	croak ("callback must be undef or of reference type"); \
511	\	1311	\
512	Newz (0, req, 1, aio_cb); \	1312	Newz (0, req, 1, aio_cb); \
513	if (!req) \	1313	if (!req) \
514	croak ("out of memory during aio_req allocation"); \	1314	croak ("out of memory during aio_req allocation"); \
515	\	1315	\
516	req->callback = newSVsv (callback);	1316	req->callback = newSVsv (callback); \
		1317	req->pri = req_pri
		1318
		1319	#define REQ_SEND \
		1320	req_send (req); \
		1321	\
		1322	if (GIMME_V != G_VOID) \
		1323	XPUSHs (req_sv (req, AIO_REQ_KLASS));
517		1324
518	MODULE = IO::AIO PACKAGE = IO::AIO	1325	MODULE = IO::AIO PACKAGE = IO::AIO
519		1326
520	PROTOTYPES: ENABLE	1327	PROTOTYPES: ENABLE
521		1328
522	BOOT:	1329	BOOT:
523	{	1330	{
		1331	HV *stash = gv_stashpv ("IO::AIO", 1);
		1332
		1333	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		1334	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1335	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1336	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1337	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1338	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		1339	newCONSTSUB (stash, "SIGIO", newSViv (SIGIO));
		1340
524	create_pipe ();	1341	create_pipe ();
525	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1342	ATFORK (atfork_prepare, atfork_parent, atfork_child);
526	}	1343	}
527		1344
528	void	1345	void
529	min_parallel(nthreads)	1346	max_poll_reqs (int nreqs)
530	int nthreads
531	PROTOTYPE: $	1347	PROTOTYPE: $
		1348	CODE:
		1349	max_poll_reqs = nreqs;
532		1350
533	void	1351	void
534	max_parallel(nthreads)	1352	max_poll_time (double nseconds)
535	int nthreads
536	PROTOTYPE: $	1353	PROTOTYPE: $
		1354	CODE:
		1355	max_poll_time = nseconds * AIO_TICKS;
		1356
		1357	void
		1358	min_parallel (int nthreads)
		1359	PROTOTYPE: $
		1360
		1361	void
		1362	max_parallel (int nthreads)
		1363	PROTOTYPE: $
		1364
		1365	void
		1366	max_idle (int nthreads)
		1367	PROTOTYPE: $
		1368	CODE:
		1369	set_max_idle (nthreads);
537		1370
538	int	1371	int
539	max_outstanding(nreqs)	1372	max_outstanding (int maxreqs)
540	int nreqs	1373	PROTOTYPE: $
541	PROTOTYPE: $
542	CODE:	1374	CODE:
543	RETVAL = max_outstanding;	1375	RETVAL = max_outstanding;
544	max_outstanding = nreqs;	1376	max_outstanding = maxreqs;
		1377	OUTPUT:
		1378	RETVAL
545		1379
546	void	1380	void
547	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1381	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
548	SV * pathname
549	int flags
550	int mode
551	SV * callback
552	PROTOTYPE: $$$;$	1382	PROTOTYPE: $$$;$
553	CODE:	1383	PPCODE:
554	{	1384	{
555	dREQ;	1385	dREQ;
556		1386
557	req->type = REQ_OPEN;	1387	req->type = REQ_OPEN;
558	req->data = newSVsv (pathname);	1388	req->sv1 = newSVsv (pathname);
559	req->dataptr = SvPVbyte_nolen (req->data);	1389	req->ptr1 = SvPVbyte_nolen (req->sv1);
560	req->fd = flags;	1390	req->int1 = flags;
561	req->mode = mode;	1391	req->mode = mode;
562		1392
563	send_req (req);	1393	REQ_SEND;
564	}	1394	}
565		1395
566	void	1396	void
567	aio_close(fh,callback=&PL_sv_undef)	1397	aio_close (SV *fh, SV *callback=&PL_sv_undef)
568	SV * fh
569	SV * callback
570	PROTOTYPE: $;$	1398	PROTOTYPE: $;$
571	ALIAS:	1399	ALIAS:
572	aio_close = REQ_CLOSE	1400	aio_close = REQ_CLOSE
573	aio_fsync = REQ_FSYNC	1401	aio_fsync = REQ_FSYNC
574	aio_fdatasync = REQ_FDATASYNC	1402	aio_fdatasync = REQ_FDATASYNC
575	CODE:	1403	PPCODE:
576	{	1404	{
577	dREQ;	1405	dREQ;
578		1406
579	req->type = ix;	1407	req->type = ix;
580	req->fh = newSVsv (fh);	1408	req->sv1 = newSVsv (fh);
581	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1409	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
582		1410
583	send_req (req);	1411	REQ_SEND (req);
584	}	1412	}
585		1413
586	void	1414	void
587	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1415	aio_read (SV *fh, UV offset, UV length, SV8 *data, UV dataoffset, SV *callback=&PL_sv_undef)
588	SV * fh
589	UV offset
590	IV length
591	SV * data
592	IV dataoffset
593	SV * callback
594	ALIAS:	1416	ALIAS:
595	aio_read = REQ_READ	1417	aio_read = REQ_READ
596	aio_write = REQ_WRITE	1418	aio_write = REQ_WRITE
597	PROTOTYPE: $$$$$;$	1419	PROTOTYPE: $$$$$;$
598	CODE:	1420	PPCODE:
599	{	1421	{
600	aio_req req;
601	STRLEN svlen;	1422	STRLEN svlen;
602	char *svptr = SvPVbyte (data, svlen);	1423	char *svptr = SvPVbyte (data, svlen);
603		1424
604	SvUPGRADE (data, SVt_PV);	1425	SvUPGRADE (data, SVt_PV);
605	SvPOK_on (data);	1426	SvPOK_on (data);
…		…
617	length = svlen - dataoffset;	1438	length = svlen - dataoffset;
618	}	1439	}
619	else	1440	else
620	{	1441	{
621	/* read: grow scalar as necessary */	1442	/* read: grow scalar as necessary */
622	svptr = SvGROW (data, length + dataoffset);	1443	svptr = SvGROW (data, length + dataoffset + 1);
623	}	1444	}
624		1445
625	if (length < 0)	1446	if (length < 0)
626	croak ("length must not be negative");	1447	croak ("length must not be negative");
627		1448
628	{	1449	{
629	dREQ;	1450	dREQ;
630		1451
631	req->type = ix;	1452	req->type = ix;
632	req->fh = newSVsv (fh);	1453	req->sv1 = newSVsv (fh);
633	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1454	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
634	: IoOFP (sv_2io (fh)));	1455	: IoOFP (sv_2io (fh)));
635	req->offset = offset;	1456	req->offs = offset;
636	req->length = length;	1457	req->size = length;
637	req->data = SvREFCNT_inc (data);	1458	req->sv2 = SvREFCNT_inc (data);
638	req->dataptr = (char *)svptr + dataoffset;	1459	req->ptr1 = (char *)svptr + dataoffset;
		1460	req->stroffset = dataoffset;
639		1461
640	if (!SvREADONLY (data))	1462	if (!SvREADONLY (data))
641	{	1463	{
642	SvREADONLY_on (data);	1464	SvREADONLY_on (data);
643	req->data2ptr = (void *)data;	1465	req->flags |= FLAG_SV1_RO_OFF;
644	}	1466	}
645		1467
646	send_req (req);	1468	REQ_SEND;
647	}	1469	}
648	}	1470	}
649		1471
650	void	1472	void
		1473	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		1474	PROTOTYPE: $$;$
		1475	PPCODE:
		1476	{
		1477	SV *data;
		1478	dREQ;
		1479
		1480	data = newSV (NAME_MAX);
		1481	SvPOK_on (data);
		1482
		1483	req->type = REQ_READLINK;
		1484	req->sv1 = newSVsv (path);
		1485	req->ptr2 = SvPVbyte_nolen (req->sv1);
		1486	req->sv2 = data;
		1487	req->ptr1 = SvPVbyte_nolen (data);
		1488
		1489	REQ_SEND;
		1490	}
		1491
		1492	void
		1493	aio_sendfile (SV *out_fh, SV *in_fh, UV in_offset, UV length, SV *callback=&PL_sv_undef)
		1494	PROTOTYPE: $$$$;$
		1495	PPCODE:
		1496	{
		1497	dREQ;
		1498
		1499	req->type = REQ_SENDFILE;
		1500	req->sv1 = newSVsv (out_fh);
		1501	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1502	req->sv2 = newSVsv (in_fh);
		1503	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1504	req->offs = in_offset;
		1505	req->size = length;
		1506
		1507	REQ_SEND;
		1508	}
		1509
		1510	void
651	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1511	aio_readahead (SV *fh, UV offset, IV length, SV *callback=&PL_sv_undef)
652	SV * fh
653	UV offset
654	IV length
655	SV * callback
656	PROTOTYPE: $$$;$	1512	PROTOTYPE: $$$;$
657	CODE:	1513	PPCODE:
658	{	1514	{
659	dREQ;	1515	dREQ;
660		1516
661	req->type = REQ_READAHEAD;	1517	req->type = REQ_READAHEAD;
662	req->fh = newSVsv (fh);	1518	req->sv1 = newSVsv (fh);
663	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1519	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
664	req->offset = offset;	1520	req->offs = offset;
665	req->length = length;	1521	req->size = length;
666		1522
667	send_req (req);	1523	REQ_SEND;
668	}	1524	}
669		1525
670	void	1526	void
671	aio_stat(fh_or_path,callback=&PL_sv_undef)	1527	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
672	SV * fh_or_path
673	SV * callback
674	ALIAS:	1528	ALIAS:
675	aio_stat = REQ_STAT	1529	aio_stat = REQ_STAT
676	aio_lstat = REQ_LSTAT	1530	aio_lstat = REQ_LSTAT
677	CODE:	1531	PPCODE:
678	{	1532	{
679	dREQ;	1533	dREQ;
680		1534
681	New (0, req->statdata, 1, Stat_t);	1535	req->ptr2 = malloc (sizeof (Stat_t));
682	if (!req->statdata)	1536	if (!req->ptr2)
683	{	1537	{
684	free_req (req);	1538	req_free (req);
685	croak ("out of memory during aio_req->statdata allocation");	1539	croak ("out of memory during aio_stat statdata allocation");
686	}	1540	}
		1541
		1542	req->flags |= FLAG_PTR2_FREE;
		1543	req->sv1 = newSVsv (fh_or_path);
687		1544
688	if (SvPOK (fh_or_path))	1545	if (SvPOK (fh_or_path))
689	{	1546	{
690	req->type = ix;	1547	req->type = ix;
691	req->data = newSVsv (fh_or_path);
692	req->dataptr = SvPVbyte_nolen (req->data);	1548	req->ptr1 = SvPVbyte_nolen (req->sv1);
693	}	1549	}
694	else	1550	else
695	{	1551	{
696	req->type = REQ_FSTAT;	1552	req->type = REQ_FSTAT;
697	req->fh = newSVsv (fh_or_path);
698	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1553	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
699	}	1554	}
700		1555
701	send_req (req);	1556	REQ_SEND;
702	}	1557	}
703		1558
704	void	1559	void
		1560	aio_utime (SV8 *fh_or_path, SV *atime, SV *mtime, SV *callback=&PL_sv_undef)
		1561	PPCODE:
		1562	{
		1563	dREQ;
		1564
		1565	req->nv1 = SvOK (atime) ? SvNV (atime) : -1.;
		1566	req->nv2 = SvOK (mtime) ? SvNV (mtime) : -1.;
		1567	req->sv1 = newSVsv (fh_or_path);
		1568
		1569	if (SvPOK (fh_or_path))
		1570	{
		1571	req->type = REQ_UTIME;
		1572	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1573	}
		1574	else
		1575	{
		1576	req->type = REQ_FUTIME;
		1577	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1578	}
		1579
		1580	REQ_SEND;
		1581	}
		1582
		1583	void
		1584	aio_chmod (SV8 *fh_or_path, int mode, SV *callback=&PL_sv_undef)
		1585	PPCODE:
		1586	{
		1587	dREQ;
		1588
		1589	req->mode = mode;
		1590	req->sv1 = newSVsv (fh_or_path);
		1591
		1592	if (SvPOK (fh_or_path))
		1593	{
		1594	req->type = REQ_CHMOD;
		1595	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1596	}
		1597	else
		1598	{
		1599	req->type = REQ_FCHMOD;
		1600	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1601	}
		1602
		1603	REQ_SEND;
		1604	}
		1605
		1606	void
		1607	aio_chown (SV8 *fh_or_path, SV *uid, SV *gid, SV *callback=&PL_sv_undef)
		1608	PPCODE:
		1609	{
		1610	dREQ;
		1611
		1612	req->int2 = SvOK (uid) ? SvIV (uid) : -1;
		1613	req->int3 = SvOK (gid) ? SvIV (gid) : -1;
		1614	req->sv1 = newSVsv (fh_or_path);
		1615
		1616	if (SvPOK (fh_or_path))
		1617	{
		1618	req->type = REQ_CHOWN;
		1619	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1620	}
		1621	else
		1622	{
		1623	req->type = REQ_FCHOWN;
		1624	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
		1625	}
		1626
		1627	REQ_SEND;
		1628	}
		1629
		1630	void
705	aio_unlink(pathname,callback=&PL_sv_undef)	1631	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
706	SV * pathname
707	SV * callback
708	ALIAS:	1632	ALIAS:
709	aio_unlink = REQ_UNLINK	1633	aio_unlink = REQ_UNLINK
710	aio_rmdir = REQ_RMDIR	1634	aio_rmdir = REQ_RMDIR
		1635	aio_readdir = REQ_READDIR
711	CODE:	1636	PPCODE:
712	{	1637	{
713	dREQ;	1638	dREQ;
714		1639
715	req->type = ix;	1640	req->type = ix;
716	req->data = newSVsv (pathname);	1641	req->sv1 = newSVsv (pathname);
717	req->dataptr = SvPVbyte_nolen (req->data);	1642	req->ptr1 = SvPVbyte_nolen (req->sv1);
718
719	send_req (req);
720	}
721		1643
		1644	REQ_SEND;
		1645	}
		1646
722	void	1647	void
723	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1648	aio_mkdir (SV8 *pathname, int mode, SV *callback=&PL_sv_undef)
724	SV * oldpath
725	SV * newpath
726	SV * callback
727	CODE:	1649	PPCODE:
728	{	1650	{
729	dREQ;	1651	dREQ;
730		1652
731	req->type = REQ_SYMLINK;	1653	req->type = REQ_MKDIR;
732	req->fh = newSVsv (oldpath);	1654	req->sv1 = newSVsv (pathname);
733	req->data2ptr = SvPVbyte_nolen (req->fh);	1655	req->ptr1 = SvPVbyte_nolen (req->sv1);
734	req->data = newSVsv (newpath);	1656	req->mode = mode;
735	req->dataptr = SvPVbyte_nolen (req->data);	1657
		1658	REQ_SEND;
		1659	}
		1660
		1661	void
		1662	aio_link (SV8 *oldpath, SV8 *newpath, SV *callback=&PL_sv_undef)
		1663	ALIAS:
		1664	aio_link = REQ_LINK
		1665	aio_symlink = REQ_SYMLINK
		1666	aio_rename = REQ_RENAME
		1667	PPCODE:
		1668	{
		1669	dREQ;
736		1670
737	send_req (req);	1671	req->type = ix;
		1672	req->sv2 = newSVsv (oldpath);
		1673	req->ptr2 = SvPVbyte_nolen (req->sv2);
		1674	req->sv1 = newSVsv (newpath);
		1675	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1676
		1677	REQ_SEND;
738	}	1678	}
739		1679
740	void	1680	void
		1681	aio_mknod (SV8 *pathname, int mode, UV dev, SV *callback=&PL_sv_undef)
		1682	PPCODE:
		1683	{
		1684	dREQ;
		1685
		1686	req->type = REQ_MKNOD;
		1687	req->sv1 = newSVsv (pathname);
		1688	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1689	req->mode = (mode_t)mode;
		1690	req->offs = dev;
		1691
		1692	REQ_SEND;
		1693	}
		1694
		1695	void
		1696	aio_busy (double delay, SV *callback=&PL_sv_undef)
		1697	PPCODE:
		1698	{
		1699	dREQ;
		1700
		1701	req->type = REQ_BUSY;
		1702	req->nv1 = delay < 0. ? 0. : delay;
		1703
		1704	REQ_SEND;
		1705	}
		1706
		1707	void
		1708	aio_group (SV *callback=&PL_sv_undef)
		1709	PROTOTYPE: ;$
		1710	PPCODE:
		1711	{
		1712	dREQ;
		1713
		1714	req->type = REQ_GROUP;
		1715
		1716	req_send (req);
		1717	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1718	}
		1719
		1720	void
		1721	aio_nop (SV *callback=&PL_sv_undef)
		1722	PPCODE:
		1723	{
		1724	dREQ;
		1725
		1726	req->type = REQ_NOP;
		1727
		1728	REQ_SEND;
		1729	}
		1730
		1731	int
		1732	aioreq_pri (int pri = 0)
		1733	PROTOTYPE: ;$
		1734	CODE:
		1735	RETVAL = next_pri - PRI_BIAS;
		1736	if (items > 0)
		1737	{
		1738	if (pri < PRI_MIN) pri = PRI_MIN;
		1739	if (pri > PRI_MAX) pri = PRI_MAX;
		1740	next_pri = pri + PRI_BIAS;
		1741	}
		1742	OUTPUT:
		1743	RETVAL
		1744
		1745	void
		1746	aioreq_nice (int nice = 0)
		1747	CODE:
		1748	nice = next_pri - nice;
		1749	if (nice < PRI_MIN) nice = PRI_MIN;
		1750	if (nice > PRI_MAX) nice = PRI_MAX;
		1751	next_pri = nice + PRI_BIAS;
		1752
		1753	void
741	flush()	1754	flush ()
742	PROTOTYPE:	1755	PROTOTYPE:
743	CODE:	1756	CODE:
744	while (nreqs)	1757	while (nreqs)
745	{	1758	{
746	poll_wait ();	1759	poll_wait ();
747	poll_cb ();	1760	poll_cb ();
748	}	1761	}
749		1762
750	void	1763	int
751	poll()	1764	poll()
752	PROTOTYPE:	1765	PROTOTYPE:
753	CODE:	1766	CODE:
754	if (nreqs)
755	{
756	poll_wait ();	1767	poll_wait ();
757	poll_cb ();	1768	RETVAL = poll_cb ();
758	}	1769	OUTPUT:
		1770	RETVAL
759		1771
760	int	1772	int
761	poll_fileno()	1773	poll_fileno()
762	PROTOTYPE:	1774	PROTOTYPE:
763	CODE:	1775	CODE:
…		…
775		1787
776	void	1788	void
777	poll_wait()	1789	poll_wait()
778	PROTOTYPE:	1790	PROTOTYPE:
779	CODE:	1791	CODE:
780	if (nreqs)
781	poll_wait ();	1792	poll_wait ();
		1793
		1794	void
		1795	setsig (int signum = SIGIO)
		1796	PROTOTYPE: ;$
		1797	CODE:
		1798	{
		1799	if (block_sig_level)
		1800	croak ("cannot call IO::AIO::setsig from within aio_block/callback");
		1801
		1802	LOCK (reslock);
		1803	main_tid = pthread_self ();
		1804	main_sig = signum;
		1805	UNLOCK (reslock);
		1806
		1807	if (main_sig && npending)
		1808	pthread_kill (main_tid, main_sig);
		1809	}
		1810
		1811	void
		1812	aio_block (SV *cb)
		1813	PROTOTYPE: &
		1814	PPCODE:
		1815	{
		1816	int count;
		1817
		1818	block_sig ();
		1819	PUSHMARK (SP);
		1820	PUTBACK;
		1821	count = call_sv (cb, GIMME_V | G_NOARGS | G_EVAL);
		1822	SPAGAIN;
		1823	unblock_sig ();
		1824
		1825	if (SvTRUE (ERRSV))
		1826	croak (0);
		1827
		1828	XSRETURN (count);
		1829	}
782		1830
783	int	1831	int
784	nreqs()	1832	nreqs()
785	PROTOTYPE:	1833	PROTOTYPE:
786	CODE:	1834	CODE:
787	RETVAL = nreqs;	1835	RETVAL = nreqs;
788	OUTPUT:	1836	OUTPUT:
789	RETVAL	1837	RETVAL
790		1838
		1839	int
		1840	nready()
		1841	PROTOTYPE:
		1842	CODE:
		1843	RETVAL = get_nready ();
		1844	OUTPUT:
		1845	RETVAL
		1846
		1847	int
		1848	npending()
		1849	PROTOTYPE:
		1850	CODE:
		1851	RETVAL = get_npending ();
		1852	OUTPUT:
		1853	RETVAL
		1854
		1855	int
		1856	nthreads()
		1857	PROTOTYPE:
		1858	CODE:
		1859	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1860	RETVAL = started;
		1861	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1862	OUTPUT:
		1863	RETVAL
		1864
		1865	PROTOTYPES: DISABLE
		1866
		1867	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1868
		1869	void
		1870	cancel (aio_req_ornot req)
		1871	CODE:
		1872	req_cancel (req);
		1873
		1874	void
		1875	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1876	CODE:
		1877	SvREFCNT_dec (req->callback);
		1878	req->callback = newSVsv (callback);
		1879
		1880	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1881
		1882	void
		1883	add (aio_req grp, ...)
		1884	PPCODE:
		1885	{
		1886	int i;
		1887	aio_req req;
		1888
		1889	if (main_sig && !block_sig_level)
		1890	croak ("aio_group->add called outside aio_block/callback context while IO::AIO::setsig is in use");
		1891
		1892	if (grp->int1 == 2)
		1893	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1894
		1895	for (i = 1; i < items; ++i )
		1896	{
		1897	if (GIMME_V != G_VOID)
		1898	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1899
		1900	req = SvAIO_REQ (ST (i));
		1901
		1902	if (req)
		1903	{
		1904	++grp->size;
		1905	req->grp = grp;
		1906
		1907	req->grp_prev = 0;
		1908	req->grp_next = grp->grp_first;
		1909
		1910	if (grp->grp_first)
		1911	grp->grp_first->grp_prev = req;
		1912
		1913	grp->grp_first = req;
		1914	}
		1915	}
		1916	}
		1917
		1918	void
		1919	cancel_subs (aio_req_ornot req)
		1920	CODE:
		1921	req_cancel_subs (req);
		1922
		1923	void
		1924	result (aio_req grp, ...)
		1925	CODE:
		1926	{
		1927	int i;
		1928	AV *av;
		1929
		1930	grp->errorno = errno;
		1931
		1932	av = newAV ();
		1933
		1934	for (i = 1; i < items; ++i )
		1935	av_push (av, newSVsv (ST (i)));
		1936
		1937	SvREFCNT_dec (grp->sv1);
		1938	grp->sv1 = (SV *)av;
		1939	}
		1940
		1941	void
		1942	errno (aio_req grp, int errorno = errno)
		1943	CODE:
		1944	grp->errorno = errorno;
		1945
		1946	void
		1947	limit (aio_req grp, int limit)
		1948	CODE:
		1949	grp->int2 = limit;
		1950	aio_grp_feed (grp);
		1951
		1952	void
		1953	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1954	CODE:
		1955	{
		1956	SvREFCNT_dec (grp->sv2);
		1957	grp->sv2 = newSVsv (callback);
		1958
		1959	if (grp->int2 <= 0)
		1960	grp->int2 = 2;
		1961
		1962	aio_grp_feed (grp);
		1963	}
		1964

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