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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.24 by root, Wed Aug 17 03:01:56 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_mutex_t frklock = PTHREAD_MUTEX_INITIALIZER;
68	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	221	static cond_t reqwait = COND_INIT;
69		222
70	static volatile aio_req reqs, reqe; /* queue start, queue end */	223	#if WORDACCESS_UNSAFE
71	static volatile aio_req ress, rese; /* queue start, queue end */
72		224
73	static void	225	static unsigned int get_nready ()
74	poll_wait ()
75	{	226	{
76	if (nreqs && !ress)	227	unsigned int retval;
		228
		229	LOCK (reqlock);
		230	retval = nready;
		231	UNLOCK (reqlock);
		232
		233	return retval;
		234	}
		235
		236	static unsigned int get_npending ()
		237	{
		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])
77	{	285	{
78	fd_set rfd;	286	q->qe[pri]->next = req;
79	FD_ZERO(&rfd);	287	q->qe[pri] = req;
80	FD_SET(respipe [0], &rfd);
81
82	select (respipe [0] + 1, &rfd, 0, 0, 0);
83	}	288	}
84	}	289	else
		290	q->qe[pri] = q->qs[pri] = req;
85		291
86	static int	292	return q->size++;
87	poll_cb ()	293	}
		294
		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--; )
		305	{
		306	aio_req req = q->qs[pri];
		307
		308	if (req)
		309	{
		310	if (!(q->qs[pri] = req->next))
		311	q->qe[pri] = 0;
		312
		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)
88	{	409	{
89	dSP;	410	dSP;
90	int count = 0;
91	int do_croak = 0;
92	aio_req req, prv;
93		411
94	pthread_mutex_lock (&reslock);	412	if (req->flags & FLAG_SV1_RO_OFF)
		413	SvREADONLY_off (req->sv1);
95		414
96	{	415	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
97	/* read any signals sent by the worker threads */
98	char buf [32];
99	while (read (respipe [0], buf, 32) == 32)
100	;
101	}
102
103	req = ress;
104	ress = rese = 0;
105
106	pthread_mutex_unlock (&reslock);
107
108	while (req)
109	{	416	{
110	nreqs--;	417	ENTER;
		418	SAVETMPS;
		419	PUSHMARK (SP);
		420	EXTEND (SP, 1);
111		421
112	if (req->type == REQ_QUIT)	422	switch (req->type)
113	started--;
114	else
115	{	423	{
116	int errorno = errno;	424	case REQ_READDIR:
117	errno = req->errorno;
118
119	if (req->type == REQ_READ)
120	SvCUR_set (req->data, req->dataoffset
121	+ req->result > 0 ? req->result : 0);
122
123	if (req->data)
124	SvREFCNT_dec (req->data);
125
126	if (req->fh)
127	SvREFCNT_dec (req->fh);
128
129	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
130	{	425	{
131	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	426	SV *rv = &PL_sv_undef;
132	PL_laststatval = req->result;
133	PL_statcache = *(req->statdata);
134		427
135	Safefree (req->statdata);	428	if (req->result >= 0)
		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);
136	}	448	}
		449	break;
137		450
138	ENTER;	451	case REQ_OPEN:
139	PUSHMARK (SP);
140	XPUSHs (sv_2mortal (newSViv (req->result)));
141
142	if (req->type == REQ_OPEN)
143	{	452	{
144	/* convert fd to fh */	453	/* convert fd to fh */
145	SV *fh;	454	SV *fh;
146		455
		456	PUSHs (sv_2mortal (newSViv (req->result)));
147	PUTBACK;	457	PUTBACK;
148	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	458	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
149	SPAGAIN;	459	SPAGAIN;
150		460
151	fh = SvREFCNT_inc (POPs);	461	fh = POPs;
152
153	PUSHMARK (SP);	462	PUSHMARK (SP);
154	XPUSHs (sv_2mortal (fh));	463	XPUSHs (fh);
155	}	464	}
		465	break;
156		466
157	if (SvOK (req->callback))	467	case REQ_GROUP:
		468	req->int1 = 2; /* mark group as finished */
		469
		470	if (req->sv1)
158	{	471	{
159	PUTBACK;	472	int i;
160	call_sv (req->callback, G_VOID | G_EVAL);	473	AV *av = (AV *)req->sv1;
161	SPAGAIN;	474
		475	EXTEND (SP, AvFILL (av) + 1);
		476	for (i = 0; i <= AvFILL (av); ++i)
		477	PUSHs (*av_fetch (av, i, 0));
162	}	478	}
		479	break;
163		480
164	do_croak = SvTRUE (ERRSV);	481	case REQ_NOP:
		482	case REQ_BUSY:
		483	break;
165		484
166	LEAVE;	485	case REQ_READLINK:
		486	if (req->result > 0)
167		487	{
168	if (req->callback)	488	SvCUR_set (req->sv2, req->result);
169	SvREFCNT_dec (req->callback);	489	*SvEND (req->sv2) = 0;
		490	PUSHs (req->sv2);
		491	}
		492	break;
170		493
171	errno = errorno;	494	case REQ_STAT:
172	count++;	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;
173	}	512	}
174		513
175	prv = req;	514	errno = req->errorno;
176	req = req->next;
177	Safefree (prv);
178		515
179	if (do_croak)	516	PUTBACK;
180	croak (0);	517	call_sv (req->callback, G_VOID | G_EVAL);
		518	SPAGAIN;
		519
		520	FREETMPS;
		521	LEAVE;
181	}	522	}
182		523
183	return count;	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);
184	}	578	}
185		579
186	static void *aio_proc(void *arg);	580	static void *aio_proc(void *arg);
187		581
188	static void
189	start_thread (void)	582	static void start_thread (void)
190	{	583	{
191	sigset_t fullsigset, oldsigset;	584	worker *wrk = calloc (1, sizeof (worker));
192	pthread_t tid;
193	pthread_attr_t attr;
194		585
195	pthread_attr_init (&attr);	586	if (!wrk)
196	pthread_attr_setstacksize (&attr, STACKSIZE);	587	croak ("unable to allocate worker thread data");
197	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
198		588
199	sigfillset (&fullsigset);	589	LOCK (wrklock);
200	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
201		590
202	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)	591	if (thread_create (&wrk->tid, aio_proc, (void *)wrk))
203	started++;
204
205	sigprocmask (SIG_SETMASK, &oldsigset, 0);
206	}
207
208	static void
209	send_req (aio_req req)
210	{
211	nreqs++;
212
213	pthread_mutex_lock (&reqlock);
214
215	req->next = 0;
216
217	if (reqe)
218	{	592	{
219	reqe->next = req;	593	wrk->prev = &wrk_first;
220	reqe = req;	594	wrk->next = wrk_first.next;
		595	wrk_first.next->prev = wrk;
		596	wrk_first.next = wrk;
		597	++started;
221	}	598	}
222	else	599	else
223	reqe = reqs = req;	600	free (wrk);
224		601
225	pthread_cond_signal (&reqwait);	602	UNLOCK (wrklock);
226	pthread_mutex_unlock (&reqlock);	603	}
227		604
228	while (nreqs > max_outstanding)	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)
229	{	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)
		722	{
		723	--npending;
		724
		725	if (!res_queue.size)
		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	{
		750	req_free (req);
		751	unblock_sig ();
		752	croak (0);
		753	}
		754
		755	count++;
		756	}
		757
		758	req_free (req);
		759
		760	if (maxreqs && !--maxreqs)
		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	}
		770	}
		771
		772	if (nreqs <= max_outstanding)
		773	break;
		774
230	poll_wait ();	775	poll_wait ();
231	poll_cb ();	776
		777	++maxreqs;
232	}	778	}
233	}
234		779
235	static void	780	unblock_sig ();
236	end_thread (void)	781	return count;
237	{
238	aio_req req;
239	New (0, req, 1, aio_cb);
240	req->type = REQ_QUIT;
241
242	send_req (req);
243	}	782	}
244		783
245		784	static void create_pipe ()
246	static void min_parallel (int nthreads)
247	{	785	{
248	while (nthreads > started)	786	if (pipe (respipe))
249	start_thread ();	787	croak ("unable to initialize result pipe");
250	}
251		788
252	static void max_parallel (int nthreads)	789	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
253	{	790	croak ("cannot set result pipe to nonblocking mode");
254	int cur = started;
255	while (cur > nthreads)
256	{
257	end_thread ();
258	cur--;
259	}
260		791
261	while (started > nthreads)	792	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
262	{	793	croak ("cannot set result pipe to nonblocking mode");
263	poll_wait ();
264	poll_cb ();
265	}
266	}
267
268	static int fork_started;
269
270	static void atfork_prepare (void)
271	{
272	pthread_mutex_lock (&frklock);
273
274	fork_started = started;
275
276	for (;;) {
277	while (nreqs)
278	{
279	poll_wait ();
280	poll_cb ();
281	}
282
283	max_parallel (0);
284
285	pthread_mutex_lock (&reqlock);
286
287	if (!nreqs && !started)
288	break;
289
290	pthread_mutex_unlock (&reqlock);
291
292	min_parallel (fork_started);
293	}
294
295	pthread_mutex_lock (&reslock);
296
297	assert (!started);
298	assert (!nreqs);
299	assert (!reqs && !reqe);
300	assert (!ress && !rese);
301	}
302
303	static void atfork_parent (void)
304	{
305	pthread_mutex_unlock (&reslock);
306	min_parallel (fork_started);
307	pthread_mutex_unlock (&reqlock);
308	pthread_mutex_unlock (&frklock);
309	}
310
311	static void atfork_child (void)
312	{
313	reqs = reqe = 0;
314
315	atfork_parent ();
316	}	794	}
317		795
318	/*****************************************************************************/	796	/*****************************************************************************/
319	/* work around various missing functions */	797	/* work around various missing functions */
320		798
…		…
325	/*	803	/*
326	* make our pread/pwrite safe against themselves, but not against	804	* make our pread/pwrite safe against themselves, but not against
327	* 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,
328	* but that's your problem, not mine.	806	* but that's your problem, not mine.
329	*/	807	*/
330	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	808	static mutex_t preadwritelock = MUTEX_INIT;
331		809
332	static ssize_t	810	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
333	pread (int fd, void *buf, size_t count, off_t offset)
334	{	811	{
335	ssize_t res;	812	ssize_t res;
336	off_t ooffset;	813	off_t ooffset;
337		814
338	pthread_mutex_lock (&iolock);	815	LOCK (preadwritelock);
339	ooffset = lseek (fd, 0, SEEK_CUR);	816	ooffset = lseek (fd, 0, SEEK_CUR);
340	lseek (fd, offset, SEEK_SET);	817	lseek (fd, offset, SEEK_SET);
341	res = read (fd, buf, count);	818	res = read (fd, buf, count);
342	lseek (fd, ooffset, SEEK_SET);	819	lseek (fd, ooffset, SEEK_SET);
343	pthread_mutex_unlock (&iolock);	820	UNLOCK (preadwritelock);
344		821
345	return res;	822	return res;
346	}	823	}
347		824
348	static ssize_t
349	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)
350	{	826	{
351	ssize_t res;	827	ssize_t res;
352	off_t ooffset;	828	off_t ooffset;
353		829
354	pthread_mutex_lock (&iolock);	830	LOCK (preadwritelock);
355	ooffset = lseek (fd, 0, SEEK_CUR);	831	ooffset = lseek (fd, 0, SEEK_CUR);
356	lseek (fd, offset, SEEK_SET);	832	lseek (fd, offset, SEEK_SET);
357	res = write (fd, buf, count);	833	res = write (fd, buf, count);
358	lseek (fd, offset, SEEK_SET);	834	lseek (fd, offset, SEEK_SET);
359	pthread_mutex_unlock (&iolock);	835	UNLOCK (preadwritelock);
360		836
361	return res;	837	return res;
362	}	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
363	#endif	867	#endif
364		868
365	#if !HAVE_FDATASYNC	869	#if !HAVE_FDATASYNC
366	# define fdatasync fsync	870	# define fdatasync fsync
367	#endif	871	#endif
368		872
369	#if !HAVE_READAHEAD	873	#if !HAVE_READAHEAD
370	# define readahead aio_readahead	874	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
371		875
372	static char readahead_buf[4096];	876	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
373
374	static ssize_t
375	readahead (int fd, off_t offset, size_t count)
376	{	877	{
		878	dBUF;
		879
377	while (count > 0)	880	while (count > 0)
378	{	881	{
379	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	882	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
380		883
381	pread (fd, readahead_buf, len, offset);	884	pread (fd, aio_buf, len, offset);
382	offset += len;	885	offset += len;
383	count -= len;	886	count -= len;
384	}	887	}
385		888
386	errno = 0;	889	errno = 0;
387	}	890	}
		891
388	#endif	892	#endif
389		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
390	/*****************************************************************************/	1079	/*****************************************************************************/
391		1080
392	static void *
393	aio_proc (void *thr_arg)	1081	static void *aio_proc (void *thr_arg)
394	{	1082	{
395	aio_req req;	1083	aio_req req;
396	int type;	1084	struct timespec ts;
		1085	worker *self = (worker *)thr_arg;
397		1086
398	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 (;;)
399	{	1092	{
400	pthread_mutex_lock (&reqlock);	1093	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1094
		1095	LOCK (reqlock);
401		1096
402	for (;;)	1097	for (;;)
403	{	1098	{
404	req = reqs;	1099	self->req = req = reqq_shift (&req_queue);
405
406	if (reqs)
407	{
408	reqs = reqs->next;
409	if (!reqs) reqe = 0;
410	}
411		1100
412	if (req)	1101	if (req)
413	break;	1102	break;
414		1103
415	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;
416	}	1125	}
417		1126
418	pthread_mutex_unlock (&reqlock);	1127	--nready;
		1128
		1129	UNLOCK (reqlock);
419		1130
420	errno = 0; /* strictly unnecessary */	1131	errno = 0; /* strictly unnecessary */
421		1132
422	type = req->type;	1133	if (!(req->flags & FLAG_CANCELLED))
423
424	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))
425	{	1219	{
426	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
427	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
428
429	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
430
431	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
432	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
433	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
434
435	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
436	case REQ_CLOSE: req->result = close (req->fd); break;
437	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
438	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
439	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
440
441	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
442	case REQ_FSYNC: req->result = fsync (req->fd); break;
443
444	case REQ_QUIT:
445	break;
446
447	default:
448	req->result = ENOSYS;
449	break;
450	}
451
452	req->errorno = errno;
453
454	pthread_mutex_lock (&reslock);
455
456	req->next = 0;
457
458	if (rese)
459	{
460	rese->next = req;
461	rese = req;
462	}
463	else
464	{
465	rese = ress = req;
466
467	/* write a dummy byte to the pipe so fh becomes ready */	1220	/* write a dummy byte to the pipe so fh becomes ready */
468	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);
469	}	1226	}
470		1227
471	pthread_mutex_unlock (&reslock);	1228	self->req = 0;
		1229	worker_clear (self);
		1230
		1231	UNLOCK (reslock);
472	}	1232	}
473	while (type != REQ_QUIT);	1233
		1234	quit:
		1235	LOCK (wrklock);
		1236	worker_free (self);
		1237	UNLOCK (wrklock);
474		1238
475	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 ();
476	}	1302	}
477		1303
478	#define dREQ \	1304	#define dREQ \
479	aio_req req; \	1305	aio_req req; \
		1306	int req_pri = next_pri; \
		1307	next_pri = DEFAULT_PRI + PRI_BIAS; \
480	\	1308	\
481	if (SvOK (callback) && !SvROK (callback)) \	1309	if (SvOK (callback) && !SvROK (callback)) \
482	croak ("clalback must be undef or of reference type"); \	1310	croak ("callback must be undef or of reference type"); \
483	\	1311	\
484	Newz (0, req, 1, aio_cb); \	1312	Newz (0, req, 1, aio_cb); \
485	if (!req) \	1313	if (!req) \
486	croak ("out of memory during aio_req allocation"); \	1314	croak ("out of memory during aio_req allocation"); \
487	\	1315	\
488	req->callback = SvREFCNT_inc (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));
489		1324
490	MODULE = IO::AIO PACKAGE = IO::AIO	1325	MODULE = IO::AIO PACKAGE = IO::AIO
491		1326
492	PROTOTYPES: ENABLE	1327	PROTOTYPES: ENABLE
493		1328
494	BOOT:	1329	BOOT:
495	{	1330	{
496	if (pipe (respipe))	1331	HV *stash = gv_stashpv ("IO::AIO", 1);
497	croak ("unable to initialize result pipe");
498		1332
499	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	1333	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
500	croak ("cannot set result pipe to nonblocking mode");	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));
501		1340
502	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	1341	create_pipe ();
503	croak ("cannot set result pipe to nonblocking mode");
504
505	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1342	ATFORK (atfork_prepare, atfork_parent, atfork_child);
506	}	1343	}
507		1344
508	void	1345	void
509	min_parallel(nthreads)	1346	max_poll_reqs (int nreqs)
510	int nthreads
511	PROTOTYPE: $	1347	PROTOTYPE: $
		1348	CODE:
		1349	max_poll_reqs = nreqs;
512		1350
513	void	1351	void
514	max_parallel(nthreads)	1352	max_poll_time (double nseconds)
515	int nthreads
516	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);
517		1370
518	int	1371	int
519	max_outstanding(nreqs)	1372	max_outstanding (int maxreqs)
520	int nreqs	1373	PROTOTYPE: $
521	PROTOTYPE: $
522	CODE:	1374	CODE:
523	RETVAL = max_outstanding;	1375	RETVAL = max_outstanding;
524	max_outstanding = nreqs;	1376	max_outstanding = maxreqs;
		1377	OUTPUT:
		1378	RETVAL
525		1379
526	void	1380	void
527	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1381	aio_open (SV8 *pathname, int flags, int mode, SV *callback=&PL_sv_undef)
528	SV * pathname
529	int flags
530	int mode
531	SV * callback
532	PROTOTYPE: $$$;$	1382	PROTOTYPE: $$$;$
533	CODE:	1383	PPCODE:
534	{	1384	{
535	dREQ;	1385	dREQ;
536		1386
537	req->type = REQ_OPEN;	1387	req->type = REQ_OPEN;
538	req->data = newSVsv (pathname);	1388	req->sv1 = newSVsv (pathname);
539	req->dataptr = SvPVbyte_nolen (req->data);	1389	req->ptr1 = SvPVbyte_nolen (req->sv1);
540	req->fd = flags;	1390	req->int1 = flags;
541	req->mode = mode;	1391	req->mode = mode;
542		1392
543	send_req (req);	1393	REQ_SEND;
544	}	1394	}
545		1395
546	void	1396	void
547	aio_close(fh,callback=&PL_sv_undef)	1397	aio_close (SV *fh, SV *callback=&PL_sv_undef)
548	SV * fh
549	SV * callback
550	PROTOTYPE: $;$	1398	PROTOTYPE: $;$
551	ALIAS:	1399	ALIAS:
552	aio_close = REQ_CLOSE	1400	aio_close = REQ_CLOSE
553	aio_fsync = REQ_FSYNC	1401	aio_fsync = REQ_FSYNC
554	aio_fdatasync = REQ_FDATASYNC	1402	aio_fdatasync = REQ_FDATASYNC
555	CODE:	1403	PPCODE:
556	{	1404	{
557	dREQ;	1405	dREQ;
558		1406
559	req->type = ix;	1407	req->type = ix;
560	req->fh = newSVsv (fh);	1408	req->sv1 = newSVsv (fh);
561	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1409	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
562		1410
563	send_req (req);	1411	REQ_SEND (req);
564	}	1412	}
565		1413
566	void	1414	void
567	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)
568	SV * fh
569	UV offset
570	IV length
571	SV * data
572	IV dataoffset
573	SV * callback
574	ALIAS:	1416	ALIAS:
575	aio_read = REQ_READ	1417	aio_read = REQ_READ
576	aio_write = REQ_WRITE	1418	aio_write = REQ_WRITE
577	PROTOTYPE: $$$$$;$	1419	PROTOTYPE: $$$$$;$
578	CODE:	1420	PPCODE:
579	{	1421	{
580	aio_req req;
581	STRLEN svlen;	1422	STRLEN svlen;
582	char *svptr = SvPVbyte (data, svlen);	1423	char *svptr = SvPVbyte (data, svlen);
583		1424
584	SvUPGRADE (data, SVt_PV);	1425	SvUPGRADE (data, SVt_PV);
585	SvPOK_on (data);	1426	SvPOK_on (data);
…		…
597	length = svlen - dataoffset;	1438	length = svlen - dataoffset;
598	}	1439	}
599	else	1440	else
600	{	1441	{
601	/* read: grow scalar as necessary */	1442	/* read: grow scalar as necessary */
602	svptr = SvGROW (data, length + dataoffset);	1443	svptr = SvGROW (data, length + dataoffset + 1);
603	}	1444	}
604		1445
605	if (length < 0)	1446	if (length < 0)
606	croak ("length must not be negative");	1447	croak ("length must not be negative");
607		1448
608	{	1449	{
609	dREQ;	1450	dREQ;
610		1451
611	req->type = ix;	1452	req->type = ix;
612	req->fh = newSVsv (fh);	1453	req->sv1 = newSVsv (fh);
613	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1454	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
614	: IoOFP (sv_2io (fh)));	1455	: IoOFP (sv_2io (fh)));
615	req->offset = offset;	1456	req->offs = offset;
616	req->length = length;	1457	req->size = length;
617	req->data = SvREFCNT_inc (data);	1458	req->sv2 = SvREFCNT_inc (data);
618	req->dataptr = (char *)svptr + dataoffset;	1459	req->ptr1 = (char *)svptr + dataoffset;
619	req->callback = SvREFCNT_inc (callback);	1460	req->stroffset = dataoffset;
620		1461
621	send_req (req);	1462	if (!SvREADONLY (data))
		1463	{
		1464	SvREADONLY_on (data);
		1465	req->flags |= FLAG_SV1_RO_OFF;
		1466	}
		1467
		1468	REQ_SEND;
622	}	1469	}
623	}	1470	}
624		1471
625	void	1472	void
		1473	aio_readlink (SV8 *path, SV *callback=&PL_sv_undef)
		1474	PROTOTYPE: $$;$
		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: $$$$;$
		1495	PPCODE:
		1496	{
		1497	dREQ;
		1498
		1499	req->type = REQ_SENDFILE;
		1500	req->sv1 = newSVsv (out_fh);
		1501	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1502	req->sv2 = newSVsv (in_fh);
		1503	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1504	req->offs = in_offset;
		1505	req->size = length;
		1506
		1507	REQ_SEND;
		1508	}
		1509
		1510	void
626	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1511	aio_readahead (SV *fh, UV offset, IV length, SV *callback=&PL_sv_undef)
627	SV * fh
628	UV offset
629	IV length
630	SV * callback
631	PROTOTYPE: $$$;$	1512	PROTOTYPE: $$$;$
632	CODE:	1513	PPCODE:
633	{	1514	{
634	dREQ;	1515	dREQ;
635		1516
636	req->type = REQ_READAHEAD;	1517	req->type = REQ_READAHEAD;
637	req->fh = newSVsv (fh);	1518	req->sv1 = newSVsv (fh);
638	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1519	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
639	req->offset = offset;	1520	req->offs = offset;
640	req->length = length;	1521	req->size = length;
641		1522
642	send_req (req);	1523	REQ_SEND;
643	}	1524	}
644		1525
645	void	1526	void
646	aio_stat(fh_or_path,callback=&PL_sv_undef)	1527	aio_stat (SV8 *fh_or_path, SV *callback=&PL_sv_undef)
647	SV * fh_or_path
648	SV * callback
649	ALIAS:	1528	ALIAS:
650	aio_stat = REQ_STAT	1529	aio_stat = REQ_STAT
651	aio_lstat = REQ_LSTAT	1530	aio_lstat = REQ_LSTAT
652	CODE:	1531	PPCODE:
653	{	1532	{
654	dREQ;	1533	dREQ;
655		1534
656	New (0, req->statdata, 1, Stat_t);	1535	req->ptr2 = malloc (sizeof (Stat_t));
657	if (!req->statdata)	1536	if (!req->ptr2)
658	croak ("out of memory during aio_req->statdata allocation (sorry, i just leaked memory, too)");	1537	{
		1538	req_free (req);
		1539	croak ("out of memory during aio_stat statdata allocation");
		1540	}
		1541
		1542	req->flags |= FLAG_PTR2_FREE;
		1543	req->sv1 = newSVsv (fh_or_path);
659		1544
660	if (SvPOK (fh_or_path))	1545	if (SvPOK (fh_or_path))
661	{	1546	{
662	req->type = ix;	1547	req->type = ix;
663	req->data = newSVsv (fh_or_path);
664	req->dataptr = SvPVbyte_nolen (req->data);	1548	req->ptr1 = SvPVbyte_nolen (req->sv1);
665	}	1549	}
666	else	1550	else
667	{	1551	{
668	req->type = REQ_FSTAT;	1552	req->type = REQ_FSTAT;
669	req->fh = newSVsv (fh_or_path);
670	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1553	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
671	}	1554	}
672		1555
673	send_req (req);	1556	REQ_SEND;
674	}	1557	}
675		1558
676	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
677	aio_unlink(pathname,callback=&PL_sv_undef)	1631	aio_unlink (SV8 *pathname, SV *callback=&PL_sv_undef)
678	SV * pathname
679	SV * callback
680	ALIAS:	1632	ALIAS:
681	aio_unlink = REQ_UNLINK	1633	aio_unlink = REQ_UNLINK
682	aio_rmdir = REQ_RMDIR	1634	aio_rmdir = REQ_RMDIR
		1635	aio_readdir = REQ_READDIR
683	CODE:	1636	PPCODE:
684	{	1637	{
685	dREQ;	1638	dREQ;
686		1639
687	req->type = ix;	1640	req->type = ix;
688	req->data = newSVsv (pathname);	1641	req->sv1 = newSVsv (pathname);
689	req->dataptr = SvPVbyte_nolen (req->data);	1642	req->ptr1 = SvPVbyte_nolen (req->sv1);
690
691	send_req (req);
692	}
693		1643
		1644	REQ_SEND;
		1645	}
		1646
694	void	1647	void
695	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1648	aio_mkdir (SV8 *pathname, int mode, SV *callback=&PL_sv_undef)
696	SV * oldpath
697	SV * newpath
698	SV * callback
699	CODE:	1649	PPCODE:
700	{	1650	{
701	dREQ;	1651	dREQ;
702		1652
703	req->type = REQ_SYMLINK;	1653	req->type = REQ_MKDIR;
704	req->fh = newSVsv (oldpath);	1654	req->sv1 = newSVsv (pathname);
705	req->data2ptr = SvPVbyte_nolen (req->fh);	1655	req->ptr1 = SvPVbyte_nolen (req->sv1);
706	req->data = newSVsv (newpath);	1656	req->mode = mode;
707	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;
708		1670
709	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;
710	}	1678	}
711		1679
712	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
713	flush()	1754	flush ()
714	PROTOTYPE:	1755	PROTOTYPE:
715	CODE:	1756	CODE:
716	while (nreqs)	1757	while (nreqs)
717	{	1758	{
718	poll_wait ();	1759	poll_wait ();
719	poll_cb ();	1760	poll_cb ();
720	}	1761	}
721		1762
722	void	1763	int
723	poll()	1764	poll()
724	PROTOTYPE:	1765	PROTOTYPE:
725	CODE:	1766	CODE:
726	if (nreqs)
727	{
728	poll_wait ();	1767	poll_wait ();
729	poll_cb ();	1768	RETVAL = poll_cb ();
730	}	1769	OUTPUT:
		1770	RETVAL
731		1771
732	int	1772	int
733	poll_fileno()	1773	poll_fileno()
734	PROTOTYPE:	1774	PROTOTYPE:
735	CODE:	1775	CODE:
…		…
747		1787
748	void	1788	void
749	poll_wait()	1789	poll_wait()
750	PROTOTYPE:	1790	PROTOTYPE:
751	CODE:	1791	CODE:
752	if (nreqs)
753	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	}
754		1830
755	int	1831	int
756	nreqs()	1832	nreqs()
757	PROTOTYPE:	1833	PROTOTYPE:
758	CODE:	1834	CODE:
759	RETVAL = nreqs;	1835	RETVAL = nreqs;
760	OUTPUT:	1836	OUTPUT:
761	RETVAL	1837	RETVAL
762		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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