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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.35 by root, Tue Aug 23 01:16:50 2005 UTC vs.
Revision 1.92 by root, Wed Nov 8 01:59:59 2006 UTC

		1	/* solaris */
		2	#define _POSIX_PTHREAD_SEMANTICS 1
		3
		4	#if __linux && !defined(_GNU_SOURCE)
		5	# define _GNU_SOURCE
		6	#endif
		7
		8	/* just in case */
1	#define _REENTRANT 1	9	#define _REENTRANT 1
		10
2	#include <errno.h>	11	#include <errno.h>
3		12
4	#include "EXTERN.h"	13	#include "EXTERN.h"
5	#include "perl.h"	14	#include "perl.h"
6	#include "XSUB.h"	15	#include "XSUB.h"
7		16
8	#include "autoconf/config.h"	17	#include "autoconf/config.h"
9		18
10	#include <pthread.h>	19	#include <pthread.h>
11		20
		21	#include <stddef.h>
		22	#include <errno.h>
		23	#include <sys/time.h>
		24	#include <sys/select.h>
12	#include <sys/types.h>	25	#include <sys/types.h>
13	#include <sys/stat.h>	26	#include <sys/stat.h>
14		27	#include <limits.h>
15	#include <unistd.h>	28	#include <unistd.h>
16	#include <fcntl.h>	29	#include <fcntl.h>
17	#include <signal.h>	30	#include <signal.h>
18	#include <sched.h>	31	#include <sched.h>
19		32
…		…
30	# else	43	# else
31	# error sendfile support requested but not available	44	# error sendfile support requested but not available
32	# endif	45	# endif
33	#endif	46	#endif
34		47
		48	/* number of seconds after which idle threads exit */
		49	#define IDLE_TIMEOUT 10
		50
		51	/* used for struct dirent, AIX doesn't provide it */
		52	#ifndef NAME_MAX
		53	# define NAME_MAX 4096
		54	#endif
		55
		56	#ifndef PTHREAD_STACK_MIN
		57	/* care for broken platforms, e.g. windows */
		58	# define PTHREAD_STACK_MIN 16384
		59	#endif
		60
35	#if __ia64	61	#if __ia64
36	# define STACKSIZE 65536	62	# define STACKSIZE 65536
		63	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		64	# define STACKSIZE PTHREAD_STACK_MIN
37	#else	65	#else
38	# define STACKSIZE 4096	66	# define STACKSIZE 16384
39	#endif	67	#endif
		68
		69	/* wether word reads are potentially non-atomic.
		70	* this is conservatice, likely most arches this runs
		71	* on have atomic word read/writes.
		72	*/
		73	#ifndef WORDACCESS_UNSAFE
		74	# if __i386 || __x86_64
		75	# define WORDACCESS_UNSAFE 0
		76	# else
		77	# define WORDACCESS_UNSAFE 1
		78	# endif
		79	#endif
		80
		81	/* buffer size for various temporary buffers */
		82	#define AIO_BUFSIZE 65536
		83
		84	#define dBUF \
		85	char *aio_buf; \
		86	LOCK (wrklock); \
		87	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		88	UNLOCK (wrklock); \
		89	if (!aio_buf) \
		90	return -1;
		91
		92	typedef SV SV8; /* byte-sv, used for argument-checking */
40		93
41	enum {	94	enum {
42	REQ_QUIT,	95	REQ_QUIT,
43	REQ_OPEN, REQ_CLOSE,	96	REQ_OPEN, REQ_CLOSE,
44	REQ_READ, REQ_WRITE, REQ_READAHEAD,	97	REQ_READ, REQ_WRITE, REQ_READAHEAD,
45	REQ_SENDFILE,	98	REQ_SENDFILE,
46	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	99	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
47	REQ_FSYNC, REQ_FDATASYNC,	100	REQ_FSYNC, REQ_FDATASYNC,
48	REQ_UNLINK, REQ_RMDIR,	101	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
49	REQ_SYMLINK,	102	REQ_MKNOD, REQ_READDIR,
		103	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		104	REQ_GROUP, REQ_NOP,
		105	REQ_BUSY,
50	};	106	};
51		107
		108	#define AIO_REQ_KLASS "IO::AIO::REQ"
		109	#define AIO_GRP_KLASS "IO::AIO::GRP"
		110
52	typedef struct aio_cb {	111	typedef struct aio_cb
		112	{
53	struct aio_cb *volatile next;	113	struct aio_cb *volatile next;
54		114
		115	SV *callback, *fh;
		116	SV *sv1, *sv2;
		117	void *ptr1, *ptr2;
		118	off_t offs;
		119	size_t size;
		120	ssize_t result;
		121
		122	STRLEN stroffset;
55	int type;	123	int type;
56		124	int int1, int2;
57	int fd, fd2;	125	int errorno;
58	off_t offset;
59	size_t length;
60	ssize_t result;
61	mode_t mode; /* open */	126	mode_t mode; /* open */
62	int errorno;
63	SV *data, *callback;
64	SV *fh, *fh2;
65	void *dataptr, *data2ptr;
66	STRLEN dataoffset;
67		127
68	Stat_t *statdata;	128	unsigned char flags;
		129	unsigned char pri;
		130
		131	SV *self; /* the perl counterpart of this request, if any */
		132	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
69	} aio_cb;	133	} aio_cb;
70		134
		135	enum {
		136	FLAG_CANCELLED = 0x01, /* request was cancelled */
		137	FLAG_SV1_RO_OFF = 0x40, /* data was set readonly */
		138	FLAG_PTR2_FREE = 0x80, /* need to free(ptr2) */
		139	};
		140
71	typedef aio_cb *aio_req;	141	typedef aio_cb *aio_req;
		142	typedef aio_cb *aio_req_ornot;
72		143
		144	enum {
		145	PRI_MIN = -4,
		146	PRI_MAX = 4,
		147
		148	DEFAULT_PRI = 0,
		149	PRI_BIAS = -PRI_MIN,
		150	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		151	};
		152
		153	#define AIO_TICKS ((1000000 + 1023) >> 10)
		154
		155	static unsigned int max_poll_time = 0;
		156	static unsigned int max_poll_reqs = 0;
		157
		158	/* calculcate time difference in ~1/AIO_TICKS of a second */
		159	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		160	{
		161	return (tv2->tv_sec - tv1->tv_sec ) * AIO_TICKS
		162	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		163	}
		164
		165	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		166
73	static int started, wanted;	167	static unsigned int started, idle, wanted;
74	static volatile int nreqs;	168
75	static int max_outstanding = 1<<30;	169	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		170	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		171	#else
		172	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
		173	#endif
		174
		175	#define LOCK(mutex) pthread_mutex_lock (&(mutex))
		176	#define UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
		177
		178	/* worker threads management */
		179	static pthread_mutex_t wrklock = AIO_MUTEX_INIT;
		180
		181	typedef struct worker {
		182	/* locked by wrklock */
		183	struct worker *prev, *next;
		184
		185	pthread_t tid;
		186
		187	/* locked by reslock, reqlock or wrklock */
		188	aio_req req; /* currently processed request */
		189	void *dbuf;
		190	DIR *dirp;
		191	} worker;
		192
		193	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		194
		195	static void worker_clear (worker *wrk)
		196	{
		197	if (wrk->dirp)
		198	{
		199	closedir (wrk->dirp);
		200	wrk->dirp = 0;
		201	}
		202
		203	if (wrk->dbuf)
		204	{
		205	free (wrk->dbuf);
		206	wrk->dbuf = 0;
		207	}
		208	}
		209
		210	static void worker_free (worker *wrk)
		211	{
		212	wrk->next->prev = wrk->prev;
		213	wrk->prev->next = wrk->next;
		214
		215	free (wrk);
		216	}
		217
		218	static volatile unsigned int nreqs, nready, npending;
		219	static volatile unsigned int max_idle = 4;
		220	static volatile unsigned int max_outstanding = 0xffffffff;
76	static int respipe [2];	221	static int respipe [2];
77		222
78	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	223	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
79	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	224	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
80	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	225	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
81		226
82	static volatile aio_req reqs, reqe; /* queue start, queue end */	227	#if WORDACCESS_UNSAFE
83	static volatile aio_req ress, rese; /* queue start, queue end */
84		228
85	static void free_req (aio_req req)	229	static unsigned int get_nready ()
86	{	230	{
87	if (req->data)	231	unsigned int retval;
88	SvREFCNT_dec (req->data);
89		232
90	if (req->fh)	233	LOCK (reqlock);
91	SvREFCNT_dec (req->fh);	234	retval = nready;
		235	UNLOCK (reqlock);
92		236
93	if (req->fh2)	237	return retval;
94	SvREFCNT_dec (req->fh2);
95
96	if (req->statdata)
97	Safefree (req->statdata);
98
99	if (req->callback)
100	SvREFCNT_dec (req->callback);
101
102	Safefree (req);
103	}	238	}
104		239
105	static void	240	static unsigned int get_npending ()
106	poll_wait ()
107	{	241	{
108	if (nreqs && !ress)	242	unsigned int retval;
		243
		244	LOCK (reslock);
		245	retval = npending;
		246	UNLOCK (reslock);
		247
		248	return retval;
		249	}
		250
		251	static unsigned int get_nthreads ()
		252	{
		253	unsigned int retval;
		254
		255	LOCK (wrklock);
		256	retval = started;
		257	UNLOCK (wrklock);
		258
		259	return retval;
		260	}
		261
		262	#else
		263
		264	# define get_nready() nready
		265	# define get_npending() npending
		266	# define get_nthreads() started
		267
		268	#endif
		269
		270	/*
		271	* a somewhat faster data structure might be nice, but
		272	* with 8 priorities this actually needs <20 insns
		273	* per shift, the most expensive operation.
		274	*/
		275	typedef struct {
		276	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		277	int size;
		278	} reqq;
		279
		280	static reqq req_queue;
		281	static reqq res_queue;
		282
		283	int reqq_push (reqq *q, aio_req req)
		284	{
		285	int pri = req->pri;
		286	req->next = 0;
		287
		288	if (q->qe[pri])
109	{	289	{
110	fd_set rfd;	290	q->qe[pri]->next = req;
111	FD_ZERO(&rfd);	291	q->qe[pri] = req;
112	FD_SET(respipe [0], &rfd);
113
114	select (respipe [0] + 1, &rfd, 0, 0, 0);
115	}	292	}
116	}	293	else
		294	q->qe[pri] = q->qs[pri] = req;
117		295
118	static int	296	return q->size++;
119	poll_cb ()	297	}
120	{
121	dSP;
122	int count = 0;
123	int do_croak = 0;
124	aio_req req;
125		298
126	for (;;)	299	aio_req reqq_shift (reqq *q)
		300	{
		301	int pri;
		302
		303	if (!q->size)
		304	return 0;
		305
		306	--q->size;
		307
		308	for (pri = NUM_PRI; pri--; )
127	{	309	{
128	pthread_mutex_lock (&reslock);	310	aio_req req = q->qs[pri];
129	req = ress;
130		311
131	if (req)	312	if (req)
132	{	313	{
133	ress = req->next;	314	if (!(q->qs[pri] = req->next))
		315	q->qe[pri] = 0;
134		316
135	if (!ress)	317	return req;
		318	}
		319	}
		320
		321	abort ();
		322	}
		323
		324	static int poll_cb ();
		325	static void req_invoke (aio_req req);
		326	static void req_free (aio_req req);
		327	static void req_cancel (aio_req req);
		328
		329	/* must be called at most once */
		330	static SV *req_sv (aio_req req, const char *klass)
		331	{
		332	if (!req->self)
		333	{
		334	req->self = (SV *)newHV ();
		335	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		336	}
		337
		338	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		339	}
		340
		341	static aio_req SvAIO_REQ (SV *sv)
		342	{
		343	MAGIC *mg;
		344
		345	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		346	croak ("object of class " AIO_REQ_KLASS " expected");
		347
		348	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		349
		350	return mg ? (aio_req)mg->mg_ptr : 0;
		351	}
		352
		353	static void aio_grp_feed (aio_req grp)
		354	{
		355	while (grp->size < grp->int2 && !(grp->flags & FLAG_CANCELLED))
		356	{
		357	int old_len = grp->size;
		358
		359	if (grp->sv2 && SvOK (grp->sv2))
		360	{
		361	dSP;
		362
		363	ENTER;
		364	SAVETMPS;
		365	PUSHMARK (SP);
		366	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		367	PUTBACK;
		368	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		369	SPAGAIN;
		370	FREETMPS;
		371	LEAVE;
		372	}
		373
		374	/* stop if no progress has been made */
		375	if (old_len == grp->size)
		376	{
		377	SvREFCNT_dec (grp->sv2);
		378	grp->sv2 = 0;
		379	break;
		380	}
		381	}
		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	req_invoke (grp);
		395	req_free (grp);
		396	}
		397	}
		398
		399	static void req_invoke (aio_req req)
		400	{
		401	dSP;
		402
		403	if (req->flags & FLAG_SV1_RO_OFF)
		404	SvREADONLY_off (req->sv1);
		405
		406	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		407	{
		408	ENTER;
		409	SAVETMPS;
		410	PUSHMARK (SP);
		411	EXTEND (SP, 1);
		412
		413	switch (req->type)
		414	{
		415	case REQ_READDIR:
136	{	416	{
137	/* read any signals sent by the worker threads */	417	SV *rv = &PL_sv_undef;
138	char buf [32];	418
139	while (read (respipe [0], buf, 32) == 32)	419	if (req->result >= 0)
140	;	420	{
		421	int i;
		422	char *buf = req->ptr2;
		423	AV *av = newAV ();
141		424
142	rese = 0;	425	av_extend (av, req->result - 1);
		426
		427	for (i = 0; i < req->result; ++i)
		428	{
		429	SV *sv = newSVpv (buf, 0);
		430
		431	av_store (av, i, sv);
		432	buf += SvCUR (sv) + 1;
		433	}
		434
		435	rv = sv_2mortal (newRV_noinc ((SV *)av));
		436	}
		437
		438	PUSHs (rv);
143	}	439	}
144	}
145
146	pthread_mutex_unlock (&reslock);
147
148	if (!req)
149	break;	440	break;
150		441
151	nreqs--;	442	case REQ_OPEN:
152
153	if (req->type == REQ_QUIT)
154	started--;
155	else
156	{
157	int errorno = errno;
158	errno = req->errorno;
159
160	if (req->type == REQ_READ)
161	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
162
163	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
164	SvREADONLY_off (req->data);
165
166	if (req->statdata)
167	{
168	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
169	PL_laststatval = req->result;
170	PL_statcache = *(req->statdata);
171	}
172
173	ENTER;
174	PUSHMARK (SP);
175	XPUSHs (sv_2mortal (newSViv (req->result)));
176
177	if (req->type == REQ_OPEN)
178	{	443	{
179	/* convert fd to fh */	444	/* convert fd to fh */
180	SV *fh;	445	SV *fh;
181		446
		447	PUSHs (sv_2mortal (newSViv (req->result)));
182	PUTBACK;	448	PUTBACK;
183	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	449	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
184	SPAGAIN;	450	SPAGAIN;
185		451
186	fh = SvREFCNT_inc (POPs);	452	fh = SvREFCNT_inc (POPs);
187		453
188	PUSHMARK (SP);	454	PUSHMARK (SP);
189	XPUSHs (sv_2mortal (fh));	455	XPUSHs (sv_2mortal (fh));
190	}	456	}
191
192	if (SvOK (req->callback))
193	{	457	break;
194	PUTBACK;
195	call_sv (req->callback, G_VOID | G_EVAL);
196	SPAGAIN;
197		458
198	if (SvTRUE (ERRSV))	459	case REQ_GROUP:
		460	req->int1 = 2; /* mark group as finished */
		461
		462	if (req->sv1)
199	{	463	{
200	free_req (req);	464	int i;
201	croak (0);	465	AV *av = (AV *)req->sv1;
		466
		467	EXTEND (SP, AvFILL (av) + 1);
		468	for (i = 0; i <= AvFILL (av); ++i)
		469	PUSHs (*av_fetch (av, i, 0));
202	}	470	}
		471	break;
		472
		473	case REQ_NOP:
		474	case REQ_BUSY:
		475	break;
		476
		477	case REQ_READLINK:
		478	if (req->result > 0)
		479	{
		480	SvCUR_set (req->sv1, req->result);
		481	*SvEND (req->sv1) = 0;
		482	PUSHs (req->sv1);
203	}	483	}
		484	break;
204		485
205	LEAVE;	486	case REQ_STAT:
		487	case REQ_LSTAT:
		488	case REQ_FSTAT:
		489	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		490	PL_laststatval = req->result;
		491	PL_statcache = *(Stat_t *)(req->ptr2);
		492	PUSHs (sv_2mortal (newSViv (req->result)));
		493	break;
206		494
207	errno = errorno;	495	case REQ_READ:
208	count++;	496	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		497	*SvEND (req->sv1) = 0;
		498	PUSHs (sv_2mortal (newSViv (req->result)));
		499	break;
		500
		501	default:
		502	PUSHs (sv_2mortal (newSViv (req->result)));
		503	break;
209	}	504	}
210		505
211	free_req (req);	506	errno = req->errorno;
		507
		508	PUTBACK;
		509	call_sv (req->callback, G_VOID | G_EVAL);
		510	SPAGAIN;
		511
		512	FREETMPS;
		513	LEAVE;
212	}	514	}
213		515
214	return count;	516	if (req->grp)
		517	{
		518	aio_req grp = req->grp;
		519
		520	/* unlink request */
		521	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		522	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		523
		524	if (grp->grp_first == req)
		525	grp->grp_first = req->grp_next;
		526
		527	aio_grp_dec (grp);
		528	}
		529
		530	if (SvTRUE (ERRSV))
		531	{
		532	req_free (req);
		533	croak (0);
		534	}
		535	}
		536
		537	static void req_free (aio_req req)
		538	{
		539	if (req->self)
		540	{
		541	sv_unmagic (req->self, PERL_MAGIC_ext);
		542	SvREFCNT_dec (req->self);
		543	}
		544
		545	SvREFCNT_dec (req->fh);
		546	SvREFCNT_dec (req->sv1);
		547	SvREFCNT_dec (req->sv2);
		548	SvREFCNT_dec (req->callback);
		549
		550	if (req->flags & FLAG_PTR2_FREE)
		551	free (req->ptr2);
		552
		553	Safefree (req);
		554	}
		555
		556	static void req_cancel_subs (aio_req grp)
		557	{
		558	aio_req sub;
		559
		560	if (grp->type != REQ_GROUP)
		561	return;
		562
		563	SvREFCNT_dec (grp->sv2);
		564	grp->sv2 = 0;
		565
		566	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		567	req_cancel (sub);
		568	}
		569
		570	static void req_cancel (aio_req req)
		571	{
		572	req->flags |= FLAG_CANCELLED;
		573
		574	req_cancel_subs (req);
215	}	575	}
216		576
217	static void *aio_proc(void *arg);	577	static void *aio_proc(void *arg);
218		578
219	static void
220	start_thread (void)	579	static void start_thread (void)
221	{	580	{
222	sigset_t fullsigset, oldsigset;	581	sigset_t fullsigset, oldsigset;
223	pthread_t tid;
224	pthread_attr_t attr;	582	pthread_attr_t attr;
		583
		584	worker *wrk = calloc (1, sizeof (worker));
		585
		586	if (!wrk)
		587	croak ("unable to allocate worker thread data");
225		588
226	pthread_attr_init (&attr);	589	pthread_attr_init (&attr);
227	pthread_attr_setstacksize (&attr, STACKSIZE);	590	pthread_attr_setstacksize (&attr, STACKSIZE);
228	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);	591	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		592	#ifdef PTHREAD_SCOPE_PROCESS
		593	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		594	#endif
229		595
230	sigfillset (&fullsigset);	596	sigfillset (&fullsigset);
		597
		598	LOCK (wrklock);
231	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	599	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
232		600
233	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)	601	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
234	started++;
235
236	sigprocmask (SIG_SETMASK, &oldsigset, 0);
237	}
238
239	static void
240	send_req (aio_req req)
241	{
242	while (started < wanted && nreqs >= started)
243	start_thread ();
244
245	nreqs++;
246
247	pthread_mutex_lock (&reqlock);
248
249	req->next = 0;
250
251	if (reqe)
252	{	602	{
253	reqe->next = req;	603	wrk->prev = &wrk_first;
254	reqe = req;	604	wrk->next = wrk_first.next;
		605	wrk_first.next->prev = wrk;
		606	wrk_first.next = wrk;
		607	++started;
255	}	608	}
256	else	609	else
257	reqe = reqs = req;	610	free (wrk);
258		611
		612	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		613	UNLOCK (wrklock);
		614	}
		615
		616	static void maybe_start_thread ()
		617	{
		618	if (get_nthreads () >= wanted)
		619	return;
		620
		621	/* todo: maybe use idle here, but might be less exact */
		622	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		623	return;
		624
		625	start_thread ();
		626	}
		627
		628	static void req_send (aio_req req)
		629	{
		630	++nreqs;
		631
		632	LOCK (reqlock);
		633	++nready;
		634	reqq_push (&req_queue, req);
259	pthread_cond_signal (&reqwait);	635	pthread_cond_signal (&reqwait);
260	pthread_mutex_unlock (&reqlock);	636	UNLOCK (reqlock);
261		637
262	if (nreqs > max_outstanding)	638	maybe_start_thread ();
263	for (;;)
264	{
265	poll_cb ();
266
267	if (nreqs <= max_outstanding)
268	break;
269
270	poll_wait ();
271	}
272	}	639	}
273		640
274	static void	641	static void end_thread (void)
275	end_thread (void)
276	{	642	{
277	aio_req req;	643	aio_req req;
		644
278	Newz (0, req, 1, aio_cb);	645	Newz (0, req, 1, aio_cb);
		646
279	req->type = REQ_QUIT;	647	req->type = REQ_QUIT;
		648	req->pri = PRI_MAX + PRI_BIAS;
280		649
281	send_req (req);	650	LOCK (reqlock);
		651	reqq_push (&req_queue, req);
		652	pthread_cond_signal (&reqwait);
		653	UNLOCK (reqlock);
		654
		655	LOCK (wrklock);
		656	--started;
		657	UNLOCK (wrklock);
		658	}
		659
		660	static void set_max_idle (int nthreads)
		661	{
		662	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		663	max_idle = nthreads <= 0 ? 1 : nthreads;
		664	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
282	}	665	}
283		666
284	static void min_parallel (int nthreads)	667	static void min_parallel (int nthreads)
285	{	668	{
286	if (wanted < nthreads)	669	if (wanted < nthreads)
287	wanted = nthreads;	670	wanted = nthreads;
288	}	671	}
289		672
290	static void max_parallel (int nthreads)	673	static void max_parallel (int nthreads)
291	{	674	{
292	int cur = started;
293
294	if (wanted > nthreads)	675	if (wanted > nthreads)
295	wanted = nthreads;	676	wanted = nthreads;
296		677
297	while (cur > wanted)	678	while (started > wanted)
		679	end_thread ();
		680	}
		681
		682	static void poll_wait ()
		683	{
		684	fd_set rfd;
		685
		686	while (nreqs)
298	{	687	{
		688	int size;
		689	if (WORDACCESS_UNSAFE) LOCK (reslock);
		690	size = res_queue.size;
		691	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		692
		693	if (size)
		694	return;
		695
299	end_thread ();	696	maybe_start_thread ();
300	cur--;	697
		698	FD_ZERO(&rfd);
		699	FD_SET(respipe [0], &rfd);
		700
		701	select (respipe [0] + 1, &rfd, 0, 0, 0);
301	}	702	}
		703	}
302		704
303	while (started > wanted)	705	static int poll_cb ()
		706	{
		707	dSP;
		708	int count = 0;
		709	int maxreqs = max_poll_reqs;
		710	int do_croak = 0;
		711	struct timeval tv_start, tv_now;
		712	aio_req req;
		713
		714	if (max_poll_time)
		715	gettimeofday (&tv_start, 0);
		716
		717	for (;;)
304	{	718	{
		719	for (;;)
		720	{
		721	maybe_start_thread ();
		722
		723	LOCK (reslock);
		724	req = reqq_shift (&res_queue);
		725
		726	if (req)
		727	{
		728	--npending;
		729
		730	if (!res_queue.size)
		731	{
		732	/* read any signals sent by the worker threads */
		733	char buf [32];
		734	while (read (respipe [0], buf, 32) == 32)
		735	;
		736	}
		737	}
		738
		739	UNLOCK (reslock);
		740
		741	if (!req)
		742	break;
		743
		744	--nreqs;
		745
		746	if (req->type == REQ_GROUP && req->size)
		747	{
		748	req->int1 = 1; /* mark request as delayed */
		749	continue;
		750	}
		751	else
		752	{
		753	req_invoke (req);
		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
305	poll_wait ();	775	poll_wait ();
306	poll_cb ();	776
		777	++maxreqs;
307	}	778	}
		779
		780	return count;
308	}	781	}
309		782
310	static void create_pipe ()	783	static void create_pipe ()
311	{	784	{
312	if (pipe (respipe))	785	if (pipe (respipe))
…		…
316	croak ("cannot set result pipe to nonblocking mode");	789	croak ("cannot set result pipe to nonblocking mode");
317		790
318	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	791	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
319	croak ("cannot set result pipe to nonblocking mode");	792	croak ("cannot set result pipe to nonblocking mode");
320	}	793	}
321
322	static void atfork_prepare (void)
323	{
324	pthread_mutex_lock (&reqlock);
325	pthread_mutex_lock (&reslock);
326	}
327
328	static void atfork_parent (void)
329	{
330	pthread_mutex_unlock (&reslock);
331	pthread_mutex_unlock (&reqlock);
332	}
333
334	static void atfork_child (void)
335	{
336	aio_req prv;
337
338	started = 0;
339
340	while (reqs)
341	{
342	prv = reqs;
343	reqs = prv->next;
344	free_req (prv);
345	}
346
347	reqs = reqe = 0;
348
349	while (ress)
350	{
351	prv = ress;
352	ress = prv->next;
353	free_req (prv);
354	}
355
356	ress = rese = 0;
357
358	close (respipe [0]);
359	close (respipe [1]);
360	create_pipe ();
361
362	atfork_parent ();
363	}
364
365	/* currently noops */
366	#define LOCK_FD(fd) do { } while (0)
367	#define UNLOCK_FD(fd) do { } while (0)
368		794
369	/*****************************************************************************/	795	/*****************************************************************************/
370	/* work around various missing functions */	796	/* work around various missing functions */
371		797
372	#if !HAVE_PREADWRITE	798	#if !HAVE_PREADWRITE
…		…
376	/*	802	/*
377	* make our pread/pwrite safe against themselves, but not against	803	* make our pread/pwrite safe against themselves, but not against
378	* normal read/write by using a mutex. slows down execution a lot,	804	* normal read/write by using a mutex. slows down execution a lot,
379	* but that's your problem, not mine.	805	* but that's your problem, not mine.
380	*/	806	*/
381	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	807	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
382		808
383	static ssize_t	809	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
384	pread (int fd, void *buf, size_t count, off_t offset)
385	{	810	{
386	ssize_t res;	811	ssize_t res;
387	off_t ooffset;	812	off_t ooffset;
388		813
389	LOCK_FD (fd);	814	LOCK (preadwritelock);
390	pthread_mutex_lock (&iolock); /* replace by LOCK_FD and private buffer */
391	ooffset = lseek (fd, 0, SEEK_CUR);	815	ooffset = lseek (fd, 0, SEEK_CUR);
392	lseek (fd, offset, SEEK_SET);	816	lseek (fd, offset, SEEK_SET);
393	res = read (fd, buf, count);	817	res = read (fd, buf, count);
394	lseek (fd, ooffset, SEEK_SET);	818	lseek (fd, ooffset, SEEK_SET);
395	pthread_mutex_unlock (&iolock);	819	UNLOCK (preadwritelock);
396	UNLOCK_FD (d);
397		820
398	return res;	821	return res;
399	}	822	}
400		823
401	static ssize_t
402	pwrite (int fd, void *buf, size_t count, off_t offset)	824	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
403	{	825	{
404	ssize_t res;	826	ssize_t res;
405	off_t ooffset;	827	off_t ooffset;
406		828
407	LOCK_FD (fd);	829	LOCK (preadwritelock);
408	pthread_mutex_lock (&iolock); /* replace by LOCK_FD and private buffer */
409	ooffset = lseek (fd, 0, SEEK_CUR);	830	ooffset = lseek (fd, 0, SEEK_CUR);
410	lseek (fd, offset, SEEK_SET);	831	lseek (fd, offset, SEEK_SET);
411	res = write (fd, buf, count);	832	res = write (fd, buf, count);
412	lseek (fd, offset, SEEK_SET);	833	lseek (fd, offset, SEEK_SET);
413	pthread_mutex_unlock (&iolock);	834	UNLOCK (preadwritelock);
414	UNLOCK_FD (d);
415		835
416	return res;	836	return res;
417	}	837	}
418	#endif	838	#endif
419		839
420	#if !HAVE_FDATASYNC	840	#if !HAVE_FDATASYNC
421	# define fdatasync fsync	841	# define fdatasync fsync
422	#endif	842	#endif
423		843
424	#if !HAVE_READAHEAD	844	#if !HAVE_READAHEAD
425	# define readahead aio_readahead	845	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
426		846
427	static char readahead_buf[4096];	847	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
428
429	static ssize_t
430	readahead (int fd, off_t offset, size_t count)
431	{	848	{
		849	dBUF;
		850
432	while (count > 0)	851	while (count > 0)
433	{	852	{
434	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	853	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
435		854
436	pread (fd, readahead_buf, len, offset);	855	pread (fd, aio_buf, len, offset);
437	offset += len;	856	offset += len;
438	count -= len;	857	count -= len;
439	}	858	}
440		859
441	errno = 0;	860	errno = 0;
442	}	861	}
		862
443	#endif	863	#endif
444		864
		865	#if !HAVE_READDIR_R
		866	# define readdir_r aio_readdir_r
		867
		868	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		869
		870	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		871	{
		872	struct dirent *e;
		873	int errorno;
		874
		875	LOCK (readdirlock);
		876
		877	e = readdir (dirp);
		878	errorno = errno;
		879
		880	if (e)
		881	{
		882	*res = ent;
		883	strcpy (ent->d_name, e->d_name);
		884	}
		885	else
		886	*res = 0;
		887
		888	UNLOCK (readdirlock);
		889
		890	errno = errorno;
		891	return e ? 0 : -1;
		892	}
		893	#endif
		894
445	/* sendfile always needs emulation */	895	/* sendfile always needs emulation */
446	static ssize_t
447	sendfile_ (int ofd, int ifd, off_t offset, size_t count)	896	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
448	{	897	{
449	ssize_t res;	898	ssize_t res;
450		899
451	if (!count)	900	if (!count)
452	return 0;	901	return 0;
453
454	LOCK_FD (ofd);
455		902
456	#if HAVE_SENDFILE	903	#if HAVE_SENDFILE
457	# if __linux	904	# if __linux
458	res = sendfile (ofd, ifd, &offset, count);	905	res = sendfile (ofd, ifd, &offset, count);
459		906
460	# elif __freebsd	907	# elif __freebsd
461	/*	908	/*
462	* Of course, the freebsd sendfile is a dire hack with no thoughts	909	* Of course, the freebsd sendfile is a dire hack with no thoughts
463	* wasted on making it similar to other I/O functions.	910	* wasted on making it similar to other I/O functions.
464	*/	911	*/
465	{	912	{
466	off_t sbytes;	913	off_t sbytes;
467	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	914	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
468		915
469	if (res < 0 && sbytes)	916	if (res < 0 && sbytes)
470	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	917	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
471	res = sbytes;	918	res = sbytes;
472	}	919	}
473		920
474	# elif __hpux	921	# elif __hpux
475	res = sendfile (ofd, ifd, offset, count, 0, 0);	922	res = sendfile (ofd, ifd, offset, count, 0, 0);
476		923
477	# elif __solaris	924	# elif __solaris
478	{	925	{
479	struct sendfilevec vec;	926	struct sendfilevec vec;
480	size_t sbytes;	927	size_t sbytes;
481		928
482	vec.sfv_fd = ifd;	929	vec.sfv_fd = ifd;
483	vec.sfv_flag = 0;	930	vec.sfv_flag = 0;
484	vec.sfv_off = offset;	931	vec.sfv_off = offset;
485	vec.sfv_len = count;	932	vec.sfv_len = count;
486		933
487	res = sendfilev (ofd, &vec, 1, &sbytes);	934	res = sendfilev (ofd, &vec, 1, &sbytes);
488		935
489	if (res < 0 && sbytes)	936	if (res < 0 && sbytes)
490	res = sbytes;	937	res = sbytes;
491	}	938	}
492		939
493	# else
494	res = -1;
495	errno = ENOSYS;
496	# endif	940	# endif
		941	#else
		942	res = -1;
		943	errno = ENOSYS;
497	#endif	944	#endif
498		945
499	if (res < 0	946	if (res < 0
500	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK	947	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
501	#if __solaris	948	#if __solaris
502	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE	949	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
503	#endif	950	#endif
504	)	951	)
505	)	952	)
506	{	953	{
507	/* emulate sendfile. this is a major pain in the ass */	954	/* emulate sendfile. this is a major pain in the ass */
508	char *buf = malloc (4096);	955	dBUF;
		956
509	res = 0;	957	res = 0;
510		958
511	for (;;)	959	while (count)
512	{	960	{
513	ssize_t cnt;	961	ssize_t cnt;
514		962
515	cnt = pread (ifd, buf, 4096, offset);	963	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
516		964
517	if (cnt <= 0)	965	if (cnt <= 0)
518	{	966	{
519	if (cnt && !res) res = -1;	967	if (cnt && !res) res = -1;
520	break;	968	break;
521	}	969	}
522		970
523	cnt = write (ofd, buf, cnt);	971	cnt = write (ofd, aio_buf, cnt);
524		972
525	if (cnt <= 0)	973	if (cnt <= 0)
526	{	974	{
527	if (cnt && !res) res = -1;	975	if (cnt && !res) res = -1;
528	break;	976	break;
529	}	977	}
530		978
531	offset += cnt;	979	offset += cnt;
532	res += cnt;	980	res += cnt;
		981	count -= cnt;
533	}	982	}
534
535	{
536	int errorno = errno;
537	free (buf);
538	errno = errorno;
539	}
540	}	983	}
541		984
542	UNLOCK_FD (ofd);
543
544	return res;	985	return res;
		986	}
		987
		988	/* read a full directory */
		989	static void scandir_ (aio_req req, worker *self)
		990	{
		991	DIR *dirp;
		992	union
		993	{
		994	struct dirent d;
		995	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		996	} *u;
		997	struct dirent *entp;
		998	char *name, *names;
		999	int memlen = 4096;
		1000	int memofs = 0;
		1001	int res = 0;
		1002	int errorno;
		1003
		1004	LOCK (wrklock);
		1005	self->dirp = dirp = opendir (req->ptr1);
		1006	self->dbuf = u = malloc (sizeof (*u));
		1007	req->flags |= FLAG_PTR2_FREE;
		1008	req->ptr2 = names = malloc (memlen);
		1009	UNLOCK (wrklock);
		1010
		1011	if (dirp && u && names)
		1012	for (;;)
		1013	{
		1014	errno = 0;
		1015	readdir_r (dirp, &u->d, &entp);
		1016
		1017	if (!entp)
		1018	break;
		1019
		1020	name = entp->d_name;
		1021
		1022	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1023	{
		1024	int len = strlen (name) + 1;
		1025
		1026	res++;
		1027
		1028	while (memofs + len > memlen)
		1029	{
		1030	memlen *= 2;
		1031	LOCK (wrklock);
		1032	req->ptr2 = names = realloc (names, memlen);
		1033	UNLOCK (wrklock);
		1034
		1035	if (!names)
		1036	break;
		1037	}
		1038
		1039	memcpy (names + memofs, name, len);
		1040	memofs += len;
		1041	}
		1042	}
		1043
		1044	if (errno)
		1045	res = -1;
		1046
		1047	req->result = res;
545	}	1048	}
546		1049
547	/*****************************************************************************/	1050	/*****************************************************************************/
548		1051
549	static void *
550	aio_proc (void *thr_arg)	1052	static void *aio_proc (void *thr_arg)
551	{	1053	{
552	aio_req req;	1054	aio_req req;
553	int type;	1055	struct timespec ts;
		1056	worker *self = (worker *)thr_arg;
554		1057
555	do	1058	/* try to distribute timeouts somewhat evenly */
		1059	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1060	* (1000000000UL / 1024UL);
		1061
		1062	for (;;)
556	{	1063	{
557	pthread_mutex_lock (&reqlock);	1064	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1065
		1066	LOCK (reqlock);
558		1067
559	for (;;)	1068	for (;;)
560	{	1069	{
561	req = reqs;	1070	self->req = req = reqq_shift (&req_queue);
562
563	if (reqs)
564	{
565	reqs = reqs->next;
566	if (!reqs) reqe = 0;
567	}
568		1071
569	if (req)	1072	if (req)
570	break;	1073	break;
571		1074
		1075	++idle;
		1076
		1077	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1078	== ETIMEDOUT)
		1079	{
		1080	if (idle > max_idle)
		1081	{
		1082	--idle;
		1083	UNLOCK (reqlock);
		1084	LOCK (wrklock);
		1085	--started;
		1086	UNLOCK (wrklock);
		1087	goto quit;
		1088	}
		1089
		1090	/* we are allowed to idle, so do so without any timeout */
572	pthread_cond_wait (&reqwait, &reqlock);	1091	pthread_cond_wait (&reqwait, &reqlock);
		1092	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1093	}
		1094
		1095	--idle;
573	}	1096	}
574		1097
575	pthread_mutex_unlock (&reqlock);	1098	--nready;
		1099
		1100	UNLOCK (reqlock);
576		1101
577	errno = 0; /* strictly unnecessary */	1102	errno = 0; /* strictly unnecessary */
578		1103
579	type = req->type;	1104	if (!(req->flags & FLAG_CANCELLED))
580
581	switch (type)	1105	switch (req->type)
582	{	1106	{
583	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	1107	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
584	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	1108	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
585		1109
586	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	1110	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
587	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;	1111	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
588		1112
589	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1113	case REQ_STAT: req->result = stat (req->ptr1, (Stat_t *)req->ptr2); break;
590	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1114	case REQ_LSTAT: req->result = lstat (req->ptr1, (Stat_t *)req->ptr2); break;
591	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1115	case REQ_FSTAT: req->result = fstat (req->int1, (Stat_t *)req->ptr2); break;
592		1116
593	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	1117	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
594	case REQ_CLOSE: req->result = close (req->fd); break;	1118	case REQ_CLOSE: req->result = close (req->int1); break;
595	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1119	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
596	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1120	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
		1121	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
		1122	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
597	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	1123	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1124	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1125	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
598		1126
599	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1127	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
600	case REQ_FSYNC: req->result = fsync (req->fd); break;	1128	case REQ_FSYNC: req->result = fsync (req->int1); break;
		1129	case REQ_READDIR: scandir_ (req, self); break;
601		1130
		1131	case REQ_BUSY:
		1132	{
		1133	struct timeval tv;
		1134
		1135	tv.tv_sec = req->int1;
		1136	tv.tv_usec = req->int2;
		1137
		1138	req->result = select (0, 0, 0, 0, &tv);
		1139	}
		1140
		1141	case REQ_GROUP:
		1142	case REQ_NOP:
		1143	break;
		1144
602	case REQ_QUIT:	1145	case REQ_QUIT:
603	break;	1146	goto quit;
604		1147
605	default:	1148	default:
606	req->result = ENOSYS;	1149	req->result = ENOSYS;
607	break;	1150	break;
608	}	1151	}
609		1152
610	req->errorno = errno;	1153	req->errorno = errno;
611		1154
612	pthread_mutex_lock (&reslock);	1155	LOCK (reslock);
613		1156
614	req->next = 0;	1157	++npending;
615		1158
616	if (rese)	1159	if (!reqq_push (&res_queue, req))
617	{
618	rese->next = req;
619	rese = req;
620	}
621	else
622	{
623	rese = ress = req;
624
625	/* write a dummy byte to the pipe so fh becomes ready */	1160	/* write a dummy byte to the pipe so fh becomes ready */
626	write (respipe [1], &respipe, 1);	1161	write (respipe [1], &respipe, 1);
627	}
628		1162
629	pthread_mutex_unlock (&reslock);	1163	self->req = 0;
		1164	worker_clear (self);
		1165
		1166	UNLOCK (reslock);
630	}	1167	}
631	while (type != REQ_QUIT);	1168
		1169	quit:
		1170	LOCK (wrklock);
		1171	worker_free (self);
		1172	UNLOCK (wrklock);
632		1173
633	return 0;	1174	return 0;
		1175	}
		1176
		1177	/*****************************************************************************/
		1178
		1179	static void atfork_prepare (void)
		1180	{
		1181	LOCK (wrklock);
		1182	LOCK (reqlock);
		1183	LOCK (reslock);
		1184	#if !HAVE_PREADWRITE
		1185	LOCK (preadwritelock);
		1186	#endif
		1187	#if !HAVE_READDIR_R
		1188	LOCK (readdirlock);
		1189	#endif
		1190	}
		1191
		1192	static void atfork_parent (void)
		1193	{
		1194	#if !HAVE_READDIR_R
		1195	UNLOCK (readdirlock);
		1196	#endif
		1197	#if !HAVE_PREADWRITE
		1198	UNLOCK (preadwritelock);
		1199	#endif
		1200	UNLOCK (reslock);
		1201	UNLOCK (reqlock);
		1202	UNLOCK (wrklock);
		1203	}
		1204
		1205	static void atfork_child (void)
		1206	{
		1207	aio_req prv;
		1208
		1209	while (prv = reqq_shift (&req_queue))
		1210	req_free (prv);
		1211
		1212	while (prv = reqq_shift (&res_queue))
		1213	req_free (prv);
		1214
		1215	while (wrk_first.next != &wrk_first)
		1216	{
		1217	worker *wrk = wrk_first.next;
		1218
		1219	if (wrk->req)
		1220	req_free (wrk->req);
		1221
		1222	worker_clear (wrk);
		1223	worker_free (wrk);
		1224	}
		1225
		1226	started = 0;
		1227	idle = 0;
		1228	nreqs = 0;
		1229	nready = 0;
		1230	npending = 0;
		1231
		1232	close (respipe [0]);
		1233	close (respipe [1]);
		1234	create_pipe ();
		1235
		1236	atfork_parent ();
634	}	1237	}
635		1238
636	#define dREQ \	1239	#define dREQ \
637	aio_req req; \	1240	aio_req req; \
		1241	int req_pri = next_pri; \
		1242	next_pri = DEFAULT_PRI + PRI_BIAS; \
638	\	1243	\
639	if (SvOK (callback) && !SvROK (callback)) \	1244	if (SvOK (callback) && !SvROK (callback)) \
640	croak ("clalback must be undef or of reference type"); \	1245	croak ("callback must be undef or of reference type"); \
641	\	1246	\
642	Newz (0, req, 1, aio_cb); \	1247	Newz (0, req, 1, aio_cb); \
643	if (!req) \	1248	if (!req) \
644	croak ("out of memory during aio_req allocation"); \	1249	croak ("out of memory during aio_req allocation"); \
645	\	1250	\
646	req->callback = newSVsv (callback);	1251	req->callback = newSVsv (callback); \
		1252	req->pri = req_pri
		1253
		1254	#define REQ_SEND \
		1255	req_send (req); \
		1256	\
		1257	if (GIMME_V != G_VOID) \
		1258	XPUSHs (req_sv (req, AIO_REQ_KLASS));
647		1259
648	MODULE = IO::AIO PACKAGE = IO::AIO	1260	MODULE = IO::AIO PACKAGE = IO::AIO
649		1261
650	PROTOTYPES: ENABLE	1262	PROTOTYPES: ENABLE
651		1263
652	BOOT:	1264	BOOT:
653	{	1265	{
		1266	HV *stash = gv_stashpv ("IO::AIO", 1);
		1267
		1268	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		1269	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1270	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1271	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1272	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1273	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		1274
654	create_pipe ();	1275	create_pipe ();
655	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1276	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
656	}	1277	}
657		1278
658	void	1279	void
659	min_parallel(nthreads)	1280	max_poll_reqs (int nreqs)
660	int nthreads
661	PROTOTYPE: $	1281	PROTOTYPE: $
		1282	CODE:
		1283	max_poll_reqs = nreqs;
662		1284
663	void	1285	void
664	max_parallel(nthreads)	1286	max_poll_time (double nseconds)
665	int nthreads
666	PROTOTYPE: $	1287	PROTOTYPE: $
		1288	CODE:
		1289	max_poll_time = nseconds * AIO_TICKS;
		1290
		1291	void
		1292	min_parallel (int nthreads)
		1293	PROTOTYPE: $
		1294
		1295	void
		1296	max_parallel (int nthreads)
		1297	PROTOTYPE: $
		1298
		1299	void
		1300	max_idle (int nthreads)
		1301	PROTOTYPE: $
		1302	CODE:
		1303	set_max_idle (nthreads);
667		1304
668	int	1305	int
669	max_outstanding(nreqs)	1306	max_outstanding (int maxreqs)
670	int nreqs	1307	PROTOTYPE: $
671	PROTOTYPE: $
672	CODE:	1308	CODE:
673	RETVAL = max_outstanding;	1309	RETVAL = max_outstanding;
674	max_outstanding = nreqs;	1310	max_outstanding = maxreqs;
		1311	OUTPUT:
		1312	RETVAL
675		1313
676	void	1314	void
677	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1315	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
678	SV * pathname	1316	SV8 * pathname
679	int flags	1317	int flags
680	int mode	1318	int mode
681	SV * callback	1319	SV * callback
682	PROTOTYPE: $$$;$	1320	PROTOTYPE: $$$;$
683	CODE:	1321	PPCODE:
684	{	1322	{
685	dREQ;	1323	dREQ;
686		1324
687	req->type = REQ_OPEN;	1325	req->type = REQ_OPEN;
688	req->data = newSVsv (pathname);	1326	req->sv1 = newSVsv (pathname);
689	req->dataptr = SvPVbyte_nolen (req->data);	1327	req->ptr1 = SvPVbyte_nolen (req->sv1);
690	req->fd = flags;	1328	req->int1 = flags;
691	req->mode = mode;	1329	req->mode = mode;
692		1330
693	send_req (req);	1331	REQ_SEND;
694	}	1332	}
695		1333
696	void	1334	void
697	aio_close(fh,callback=&PL_sv_undef)	1335	aio_close (fh,callback=&PL_sv_undef)
698	SV * fh	1336	SV * fh
699	SV * callback	1337	SV * callback
700	PROTOTYPE: $;$	1338	PROTOTYPE: $;$
701	ALIAS:	1339	ALIAS:
702	aio_close = REQ_CLOSE	1340	aio_close = REQ_CLOSE
703	aio_fsync = REQ_FSYNC	1341	aio_fsync = REQ_FSYNC
704	aio_fdatasync = REQ_FDATASYNC	1342	aio_fdatasync = REQ_FDATASYNC
705	CODE:	1343	PPCODE:
706	{	1344	{
707	dREQ;	1345	dREQ;
708		1346
709	req->type = ix;	1347	req->type = ix;
710	req->fh = newSVsv (fh);	1348	req->fh = newSVsv (fh);
711	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1349	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
712		1350
713	send_req (req);	1351	REQ_SEND (req);
714	}	1352	}
715		1353
716	void	1354	void
717	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1355	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
718	SV * fh	1356	SV * fh
719	UV offset	1357	UV offset
720	UV length	1358	UV length
721	SV * data	1359	SV8 * data
722	UV dataoffset	1360	UV dataoffset
723	SV * callback	1361	SV * callback
724	ALIAS:	1362	ALIAS:
725	aio_read = REQ_READ	1363	aio_read = REQ_READ
726	aio_write = REQ_WRITE	1364	aio_write = REQ_WRITE
727	PROTOTYPE: $$$$$;$	1365	PROTOTYPE: $$$$$;$
728	CODE:	1366	PPCODE:
729	{	1367	{
730	aio_req req;
731	STRLEN svlen;	1368	STRLEN svlen;
732	char *svptr = SvPVbyte (data, svlen);	1369	char *svptr = SvPVbyte (data, svlen);
733		1370
734	SvUPGRADE (data, SVt_PV);	1371	SvUPGRADE (data, SVt_PV);
735	SvPOK_on (data);	1372	SvPOK_on (data);
…		…
757		1394
758	{	1395	{
759	dREQ;	1396	dREQ;
760		1397
761	req->type = ix;	1398	req->type = ix;
762	req->fh = newSVsv (fh);	1399	req->fh = newSVsv (fh);
763	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1400	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
764	: IoOFP (sv_2io (fh)));	1401	: IoOFP (sv_2io (fh)));
765	req->offset = offset;	1402	req->offs = offset;
766	req->length = length;	1403	req->size = length;
767	req->data = SvREFCNT_inc (data);	1404	req->sv1 = SvREFCNT_inc (data);
768	req->dataptr = (char *)svptr + dataoffset;	1405	req->ptr1 = (char *)svptr + dataoffset;
		1406	req->stroffset = dataoffset;
769		1407
770	if (!SvREADONLY (data))	1408	if (!SvREADONLY (data))
771	{	1409	{
772	SvREADONLY_on (data);	1410	SvREADONLY_on (data);
773	req->data2ptr = (void *)data;	1411	req->flags |= FLAG_SV1_RO_OFF;
774	}	1412	}
775		1413
776	send_req (req);	1414	REQ_SEND;
777	}	1415	}
778	}	1416	}
779		1417
780	void	1418	void
		1419	aio_readlink (path,callback=&PL_sv_undef)
		1420	SV8 * path
		1421	SV * callback
		1422	PROTOTYPE: $$;$
		1423	PPCODE:
		1424	{
		1425	SV *data;
		1426	dREQ;
		1427
		1428	data = newSV (NAME_MAX);
		1429	SvPOK_on (data);
		1430
		1431	req->type = REQ_READLINK;
		1432	req->fh = newSVsv (path);
		1433	req->ptr2 = SvPVbyte_nolen (req->fh);
		1434	req->sv1 = data;
		1435	req->ptr1 = SvPVbyte_nolen (data);
		1436
		1437	REQ_SEND;
		1438	}
		1439
		1440	void
781	aio_sendfile(out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	1441	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
782	SV * out_fh	1442	SV * out_fh
783	SV * in_fh	1443	SV * in_fh
784	UV in_offset	1444	UV in_offset
785	UV length	1445	UV length
786	SV * callback	1446	SV * callback
787	PROTOTYPE: $$$$;$	1447	PROTOTYPE: $$$$;$
788	CODE:	1448	PPCODE:
789	{	1449	{
790	dREQ;	1450	dREQ;
791		1451
792	req->type = REQ_SENDFILE;	1452	req->type = REQ_SENDFILE;
793	req->fh = newSVsv (out_fh);	1453	req->fh = newSVsv (out_fh);
794	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1454	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
795	req->fh2 = newSVsv (in_fh);	1455	req->sv2 = newSVsv (in_fh);
796	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1456	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
797	req->offset = in_offset;	1457	req->offs = in_offset;
798	req->length = length;	1458	req->size = length;
799		1459
800	send_req (req);	1460	REQ_SEND;
801	}	1461	}
802		1462
803	void	1463	void
804	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1464	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
805	SV * fh	1465	SV * fh
806	UV offset	1466	UV offset
807	IV length	1467	IV length
808	SV * callback	1468	SV * callback
809	PROTOTYPE: $$$;$	1469	PROTOTYPE: $$$;$
810	CODE:	1470	PPCODE:
811	{	1471	{
812	dREQ;	1472	dREQ;
813		1473
814	req->type = REQ_READAHEAD;	1474	req->type = REQ_READAHEAD;
815	req->fh = newSVsv (fh);	1475	req->fh = newSVsv (fh);
816	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1476	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
817	req->offset = offset;	1477	req->offs = offset;
818	req->length = length;	1478	req->size = length;
819		1479
820	send_req (req);	1480	REQ_SEND;
821	}	1481	}
822		1482
823	void	1483	void
824	aio_stat(fh_or_path,callback=&PL_sv_undef)	1484	aio_stat (fh_or_path,callback=&PL_sv_undef)
825	SV * fh_or_path	1485	SV8 * fh_or_path
826	SV * callback	1486	SV * callback
827	ALIAS:	1487	ALIAS:
828	aio_stat = REQ_STAT	1488	aio_stat = REQ_STAT
829	aio_lstat = REQ_LSTAT	1489	aio_lstat = REQ_LSTAT
830	CODE:	1490	PPCODE:
831	{	1491	{
832	dREQ;	1492	dREQ;
833		1493
834	New (0, req->statdata, 1, Stat_t);	1494	req->ptr2 = malloc (sizeof (Stat_t));
835	if (!req->statdata)	1495	if (!req->ptr2)
836	{	1496	{
837	free_req (req);	1497	req_free (req);
838	croak ("out of memory during aio_req->statdata allocation");	1498	croak ("out of memory during aio_stat statdata allocation");
839	}	1499	}
		1500
		1501	req->flags |= FLAG_PTR2_FREE;
840		1502
841	if (SvPOK (fh_or_path))	1503	if (SvPOK (fh_or_path))
842	{	1504	{
843	req->type = ix;	1505	req->type = ix;
844	req->data = newSVsv (fh_or_path);	1506	req->sv1 = newSVsv (fh_or_path);
845	req->dataptr = SvPVbyte_nolen (req->data);	1507	req->ptr1 = SvPVbyte_nolen (req->sv1);
846	}	1508	}
847	else	1509	else
848	{	1510	{
849	req->type = REQ_FSTAT;	1511	req->type = REQ_FSTAT;
850	req->fh = newSVsv (fh_or_path);	1512	req->fh = newSVsv (fh_or_path);
851	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1513	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
852	}	1514	}
853		1515
854	send_req (req);	1516	REQ_SEND;
855	}	1517	}
856		1518
857	void	1519	void
858	aio_unlink(pathname,callback=&PL_sv_undef)	1520	aio_unlink (pathname,callback=&PL_sv_undef)
859	SV * pathname	1521	SV8 * pathname
860	SV * callback	1522	SV * callback
861	ALIAS:	1523	ALIAS:
862	aio_unlink = REQ_UNLINK	1524	aio_unlink = REQ_UNLINK
863	aio_rmdir = REQ_RMDIR	1525	aio_rmdir = REQ_RMDIR
		1526	aio_readdir = REQ_READDIR
864	CODE:	1527	PPCODE:
865	{	1528	{
866	dREQ;	1529	dREQ;
867		1530
868	req->type = ix;	1531	req->type = ix;
869	req->data = newSVsv (pathname);	1532	req->sv1 = newSVsv (pathname);
870	req->dataptr = SvPVbyte_nolen (req->data);	1533	req->ptr1 = SvPVbyte_nolen (req->sv1);
871
872	send_req (req);
873	}
874		1534
		1535	REQ_SEND;
		1536	}
		1537
875	void	1538	void
876	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1539	aio_link (oldpath,newpath,callback=&PL_sv_undef)
877	SV * oldpath	1540	SV8 * oldpath
878	SV * newpath	1541	SV8 * newpath
879	SV * callback	1542	SV * callback
		1543	ALIAS:
		1544	aio_link = REQ_LINK
		1545	aio_symlink = REQ_SYMLINK
		1546	aio_rename = REQ_RENAME
880	CODE:	1547	PPCODE:
881	{	1548	{
882	dREQ;	1549	dREQ;
883		1550
884	req->type = REQ_SYMLINK;	1551	req->type = ix;
885	req->fh = newSVsv (oldpath);	1552	req->fh = newSVsv (oldpath);
886	req->data2ptr = SvPVbyte_nolen (req->fh);	1553	req->ptr2 = SvPVbyte_nolen (req->fh);
887	req->data = newSVsv (newpath);	1554	req->sv1 = newSVsv (newpath);
888	req->dataptr = SvPVbyte_nolen (req->data);	1555	req->ptr1 = SvPVbyte_nolen (req->sv1);
889		1556
890	send_req (req);	1557	REQ_SEND;
891	}	1558	}
892		1559
893	void	1560	void
		1561	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
		1562	SV8 * pathname
		1563	SV * callback
		1564	UV mode
		1565	UV dev
		1566	PPCODE:
		1567	{
		1568	dREQ;
		1569
		1570	req->type = REQ_MKNOD;
		1571	req->sv1 = newSVsv (pathname);
		1572	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1573	req->mode = (mode_t)mode;
		1574	req->offs = dev;
		1575
		1576	REQ_SEND;
		1577	}
		1578
		1579	void
		1580	aio_busy (delay,callback=&PL_sv_undef)
		1581	double delay
		1582	SV * callback
		1583	PPCODE:
		1584	{
		1585	dREQ;
		1586
		1587	req->type = REQ_BUSY;
		1588	req->int1 = delay < 0. ? 0 : delay;
		1589	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
		1590
		1591	REQ_SEND;
		1592	}
		1593
		1594	void
		1595	aio_group (callback=&PL_sv_undef)
		1596	SV * callback
		1597	PROTOTYPE: ;$
		1598	PPCODE:
		1599	{
		1600	dREQ;
		1601
		1602	req->type = REQ_GROUP;
		1603
		1604	req_send (req);
		1605	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1606	}
		1607
		1608	void
		1609	aio_nop (callback=&PL_sv_undef)
		1610	SV * callback
		1611	PPCODE:
		1612	{
		1613	dREQ;
		1614
		1615	req->type = REQ_NOP;
		1616
		1617	REQ_SEND;
		1618	}
		1619
		1620	int
		1621	aioreq_pri (int pri = 0)
		1622	PROTOTYPE: ;$
		1623	CODE:
		1624	RETVAL = next_pri - PRI_BIAS;
		1625	if (items > 0)
		1626	{
		1627	if (pri < PRI_MIN) pri = PRI_MIN;
		1628	if (pri > PRI_MAX) pri = PRI_MAX;
		1629	next_pri = pri + PRI_BIAS;
		1630	}
		1631	OUTPUT:
		1632	RETVAL
		1633
		1634	void
		1635	aioreq_nice (int nice = 0)
		1636	CODE:
		1637	nice = next_pri - nice;
		1638	if (nice < PRI_MIN) nice = PRI_MIN;
		1639	if (nice > PRI_MAX) nice = PRI_MAX;
		1640	next_pri = nice + PRI_BIAS;
		1641
		1642	void
894	flush()	1643	flush ()
895	PROTOTYPE:	1644	PROTOTYPE:
896	CODE:	1645	CODE:
897	while (nreqs)	1646	while (nreqs)
898	{	1647	{
899	poll_wait ();	1648	poll_wait ();
900	poll_cb ();	1649	poll_cb ();
901	}	1650	}
902		1651
903	void	1652	int
904	poll()	1653	poll()
905	PROTOTYPE:	1654	PROTOTYPE:
906	CODE:	1655	CODE:
907	if (nreqs)
908	{
909	poll_wait ();	1656	poll_wait ();
910	poll_cb ();	1657	RETVAL = poll_cb ();
911	}	1658	OUTPUT:
		1659	RETVAL
912		1660
913	int	1661	int
914	poll_fileno()	1662	poll_fileno()
915	PROTOTYPE:	1663	PROTOTYPE:
916	CODE:	1664	CODE:
…		…
928		1676
929	void	1677	void
930	poll_wait()	1678	poll_wait()
931	PROTOTYPE:	1679	PROTOTYPE:
932	CODE:	1680	CODE:
933	if (nreqs)
934	poll_wait ();	1681	poll_wait ();
935		1682
936	int	1683	int
937	nreqs()	1684	nreqs()
938	PROTOTYPE:	1685	PROTOTYPE:
939	CODE:	1686	CODE:
940	RETVAL = nreqs;	1687	RETVAL = nreqs;
941	OUTPUT:	1688	OUTPUT:
942	RETVAL	1689	RETVAL
943		1690
		1691	int
		1692	nready()
		1693	PROTOTYPE:
		1694	CODE:
		1695	RETVAL = get_nready ();
		1696	OUTPUT:
		1697	RETVAL
		1698
		1699	int
		1700	npending()
		1701	PROTOTYPE:
		1702	CODE:
		1703	RETVAL = get_npending ();
		1704	OUTPUT:
		1705	RETVAL
		1706
		1707	int
		1708	nthreads()
		1709	PROTOTYPE:
		1710	CODE:
		1711	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1712	RETVAL = started;
		1713	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1714	OUTPUT:
		1715	RETVAL
		1716
		1717	PROTOTYPES: DISABLE
		1718
		1719	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1720
		1721	void
		1722	cancel (aio_req_ornot req)
		1723	CODE:
		1724	req_cancel (req);
		1725
		1726	void
		1727	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1728	CODE:
		1729	SvREFCNT_dec (req->callback);
		1730	req->callback = newSVsv (callback);
		1731
		1732	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1733
		1734	void
		1735	add (aio_req grp, ...)
		1736	PPCODE:
		1737	{
		1738	int i;
		1739	aio_req req;
		1740
		1741	if (grp->int1 == 2)
		1742	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1743
		1744	for (i = 1; i < items; ++i )
		1745	{
		1746	if (GIMME_V != G_VOID)
		1747	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1748
		1749	req = SvAIO_REQ (ST (i));
		1750
		1751	if (req)
		1752	{
		1753	++grp->size;
		1754	req->grp = grp;
		1755
		1756	req->grp_prev = 0;
		1757	req->grp_next = grp->grp_first;
		1758
		1759	if (grp->grp_first)
		1760	grp->grp_first->grp_prev = req;
		1761
		1762	grp->grp_first = req;
		1763	}
		1764	}
		1765	}
		1766
		1767	void
		1768	cancel_subs (aio_req_ornot req)
		1769	CODE:
		1770	req_cancel_subs (req);
		1771
		1772	void
		1773	result (aio_req grp, ...)
		1774	CODE:
		1775	{
		1776	int i;
		1777	AV *av;
		1778
		1779	grp->errorno = errno;
		1780
		1781	av = newAV ();
		1782
		1783	for (i = 1; i < items; ++i )
		1784	av_push (av, newSVsv (ST (i)));
		1785
		1786	SvREFCNT_dec (grp->sv1);
		1787	grp->sv1 = (SV *)av;
		1788	}
		1789
		1790	void
		1791	errno (aio_req grp, int errorno = errno)
		1792	CODE:
		1793	grp->errorno = errorno;
		1794
		1795	void
		1796	limit (aio_req grp, int limit)
		1797	CODE:
		1798	grp->int2 = limit;
		1799	aio_grp_feed (grp);
		1800
		1801	void
		1802	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1803	CODE:
		1804	{
		1805	SvREFCNT_dec (grp->sv2);
		1806	grp->sv2 = newSVsv (callback);
		1807
		1808	if (grp->int2 <= 0)
		1809	grp->int2 = 2;
		1810
		1811	aio_grp_feed (grp);
		1812	}
		1813

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