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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.30 by root, Thu Aug 18 16:32:10 2005 UTC vs.
Revision 1.97 by root, Sun Jan 7 22:59:57 2007 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
		19	#include <pthread.h>
		20
		21	#include <stddef.h>
		22	#include <stdlib.h>
		23	#include <errno.h>
		24	#include <sys/time.h>
		25	#include <sys/select.h>
10	#include <sys/types.h>	26	#include <sys/types.h>
11	#include <sys/stat.h>	27	#include <sys/stat.h>
12		28	#include <limits.h>
13	#include <unistd.h>	29	#include <unistd.h>
14	#include <fcntl.h>	30	#include <fcntl.h>
15	#include <signal.h>	31	#include <signal.h>
16	#include <sched.h>	32	#include <sched.h>
17		33
18	#include <pthread.h>	34	#if HAVE_SENDFILE
		35	# if __linux
		36	# include <sys/sendfile.h>
		37	# elif __freebsd
		38	# include <sys/socket.h>
		39	# include <sys/uio.h>
		40	# elif __hpux
		41	# include <sys/socket.h>
		42	# elif __solaris /* not yet */
		43	# include <sys/sendfile.h>
		44	# else
		45	# error sendfile support requested but not available
		46	# endif
		47	#endif
19		48
20	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	49	/* number of seconds after which idle threads exit */
21	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	50	#define IDLE_TIMEOUT 10
22	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	51
		52	/* used for struct dirent, AIX doesn't provide it */
		53	#ifndef NAME_MAX
		54	# define NAME_MAX 4096
		55	#endif
		56
		57	#ifndef PTHREAD_STACK_MIN
		58	/* care for broken platforms, e.g. windows */
		59	# define PTHREAD_STACK_MIN 16384
		60	#endif
23		61
24	#if __ia64	62	#if __ia64
25	# define STACKSIZE 65536	63	# define STACKSIZE 65536
		64	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		65	# define STACKSIZE PTHREAD_STACK_MIN
26	#else	66	#else
27	# define STACKSIZE 4096	67	# define STACKSIZE 16384
28	#endif	68	#endif
		69
		70	/* wether word reads are potentially non-atomic.
		71	* this is conservatice, likely most arches this runs
		72	* on have atomic word read/writes.
		73	*/
		74	#ifndef WORDACCESS_UNSAFE
		75	# if __i386 || __x86_64
		76	# define WORDACCESS_UNSAFE 0
		77	# else
		78	# define WORDACCESS_UNSAFE 1
		79	# endif
		80	#endif
		81
		82	/* buffer size for various temporary buffers */
		83	#define AIO_BUFSIZE 65536
		84
		85	#define dBUF \
		86	char *aio_buf; \
		87	LOCK (wrklock); \
		88	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		89	UNLOCK (wrklock); \
		90	if (!aio_buf) \
		91	return -1;
		92
		93	typedef SV SV8; /* byte-sv, used for argument-checking */
29		94
30	enum {	95	enum {
31	REQ_QUIT,	96	REQ_QUIT,
32	REQ_OPEN, REQ_CLOSE,	97	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,	98	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		99	REQ_SENDFILE,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	100	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35	REQ_FSYNC, REQ_FDATASYNC,	101	REQ_FSYNC, REQ_FDATASYNC,
36	REQ_UNLINK, REQ_RMDIR,	102	REQ_UNLINK, REQ_RMDIR, REQ_MKDIR, REQ_RENAME,
37	REQ_SYMLINK,	103	REQ_MKNOD, REQ_READDIR,
		104	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		105	REQ_GROUP, REQ_NOP,
		106	REQ_BUSY,
38	};	107	};
39		108
		109	#define AIO_REQ_KLASS "IO::AIO::REQ"
		110	#define AIO_GRP_KLASS "IO::AIO::GRP"
		111
40	typedef struct aio_cb {	112	typedef struct aio_cb
		113	{
41	struct aio_cb *volatile next;	114	struct aio_cb *volatile next;
42		115
		116	SV *callback, *fh;
		117	SV *sv1, *sv2;
		118	void *ptr1, *ptr2;
		119	off_t offs;
		120	size_t size;
		121	ssize_t result;
		122
		123	STRLEN stroffset;
43	int type;	124	int type;
44		125	int int1, int2;
45	int fd;	126	int errorno;
46	off_t offset;
47	size_t length;
48	ssize_t result;
49	mode_t mode; /* open */	127	mode_t mode; /* open */
50	int errorno;
51	SV *data, *callback, *fh;
52	void *dataptr, *data2ptr;
53	STRLEN dataoffset;
54		128
55	Stat_t *statdata;	129	unsigned char flags;
		130	unsigned char pri;
		131
		132	SV *self; /* the perl counterpart of this request, if any */
		133	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
56	} aio_cb;	134	} aio_cb;
57		135
		136	enum {
		137	FLAG_CANCELLED = 0x01, /* request was cancelled */
		138	FLAG_SV1_RO_OFF = 0x40, /* data was set readonly */
		139	FLAG_PTR2_FREE = 0x80, /* need to free(ptr2) */
		140	};
		141
58	typedef aio_cb *aio_req;	142	typedef aio_cb *aio_req;
		143	typedef aio_cb *aio_req_ornot;
59		144
		145	enum {
		146	PRI_MIN = -4,
		147	PRI_MAX = 4,
		148
		149	DEFAULT_PRI = 0,
		150	PRI_BIAS = -PRI_MIN,
		151	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		152	};
		153
		154	#define AIO_TICKS ((1000000 + 1023) >> 10)
		155
		156	static unsigned int max_poll_time = 0;
		157	static unsigned int max_poll_reqs = 0;
		158
		159	/* calculcate time difference in ~1/AIO_TICKS of a second */
		160	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		161	{
		162	return (tv2->tv_sec - tv1->tv_sec ) * AIO_TICKS
		163	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		164	}
		165
		166	static pthread_t main_tid;
		167	static int main_sig;
		168	static int block_sig_level;
		169
		170	void block_sig ()
		171	{
		172	sigset_t ss;
		173
		174	if (block_sig_level++)
		175	return;
		176
		177	if (!main_sig)
		178	return;
		179
		180	sigemptyset (&ss);
		181	sigaddset (&ss, main_sig);
		182	pthread_sigmask (SIG_BLOCK, &ss, 0);
		183	}
		184
		185	void unblock_sig ()
		186	{
		187	sigset_t ss;
		188
		189	if (--block_sig_level)
		190	return;
		191
		192	if (!main_sig)
		193	return;
		194
		195	sigemptyset (&ss);
		196	sigaddset (&ss, main_sig);
		197	pthread_sigmask (SIG_UNBLOCK, &ss, 0);
		198	}
		199
		200	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		201
60	static int started, wanted;	202	static unsigned int started, idle, wanted;
61	static volatile int nreqs;	203
62	static int max_outstanding = 1<<30;	204	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		205	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		206	#else
		207	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
		208	#endif
		209
		210	#define LOCK(mutex) pthread_mutex_lock (&(mutex))
		211	#define UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
		212
		213	/* worker threads management */
		214	static pthread_mutex_t wrklock = AIO_MUTEX_INIT;
		215
		216	typedef struct worker {
		217	/* locked by wrklock */
		218	struct worker *prev, *next;
		219
		220	pthread_t tid;
		221
		222	/* locked by reslock, reqlock or wrklock */
		223	aio_req req; /* currently processed request */
		224	void *dbuf;
		225	DIR *dirp;
		226	} worker;
		227
		228	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		229
		230	static void worker_clear (worker *wrk)
		231	{
		232	if (wrk->dirp)
		233	{
		234	closedir (wrk->dirp);
		235	wrk->dirp = 0;
		236	}
		237
		238	if (wrk->dbuf)
		239	{
		240	free (wrk->dbuf);
		241	wrk->dbuf = 0;
		242	}
		243	}
		244
		245	static void worker_free (worker *wrk)
		246	{
		247	wrk->next->prev = wrk->prev;
		248	wrk->prev->next = wrk->next;
		249
		250	free (wrk);
		251	}
		252
		253	static volatile unsigned int nreqs, nready, npending;
		254	static volatile unsigned int max_idle = 4;
		255	static volatile unsigned int max_outstanding = 0xffffffff;
63	static int respipe [2];	256	static int respipe [2];
64		257
65	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	258	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
66	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	259	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
67	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	260	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
68		261
69	static volatile aio_req reqs, reqe; /* queue start, queue end */	262	#if WORDACCESS_UNSAFE
70	static volatile aio_req ress, rese; /* queue start, queue end */
71		263
72	static void free_req (aio_req req)	264	static unsigned int get_nready ()
73	{	265	{
74	if (req->data)	266	unsigned int retval;
75	SvREFCNT_dec (req->data);
76		267
77	if (req->fh)	268	LOCK (reqlock);
78	SvREFCNT_dec (req->fh);	269	retval = nready;
		270	UNLOCK (reqlock);
79		271
80	if (req->statdata)	272	return retval;
81	Safefree (req->statdata);
82
83	if (req->callback)
84	SvREFCNT_dec (req->callback);
85
86	Safefree (req);
87	}	273	}
88		274
89	static void	275	static unsigned int get_npending ()
90	poll_wait ()
91	{	276	{
92	if (nreqs && !ress)	277	unsigned int retval;
		278
		279	LOCK (reslock);
		280	retval = npending;
		281	UNLOCK (reslock);
		282
		283	return retval;
		284	}
		285
		286	static unsigned int get_nthreads ()
		287	{
		288	unsigned int retval;
		289
		290	LOCK (wrklock);
		291	retval = started;
		292	UNLOCK (wrklock);
		293
		294	return retval;
		295	}
		296
		297	#else
		298
		299	# define get_nready() nready
		300	# define get_npending() npending
		301	# define get_nthreads() started
		302
		303	#endif
		304
		305	/*
		306	* a somewhat faster data structure might be nice, but
		307	* with 8 priorities this actually needs <20 insns
		308	* per shift, the most expensive operation.
		309	*/
		310	typedef struct {
		311	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		312	int size;
		313	} reqq;
		314
		315	static reqq req_queue;
		316	static reqq res_queue;
		317
		318	int reqq_push (reqq *q, aio_req req)
		319	{
		320	int pri = req->pri;
		321	req->next = 0;
		322
		323	if (q->qe[pri])
93	{	324	{
94	fd_set rfd;	325	q->qe[pri]->next = req;
95	FD_ZERO(&rfd);	326	q->qe[pri] = req;
96	FD_SET(respipe [0], &rfd);
97
98	select (respipe [0] + 1, &rfd, 0, 0, 0);
99	}	327	}
100	}	328	else
		329	q->qe[pri] = q->qs[pri] = req;
101		330
102	static int	331	return q->size++;
103	poll_cb ()	332	}
104	{
105	dSP;
106	int count = 0;
107	int do_croak = 0;
108	aio_req req;
109		333
110	for (;;)	334	aio_req reqq_shift (reqq *q)
		335	{
		336	int pri;
		337
		338	if (!q->size)
		339	return 0;
		340
		341	--q->size;
		342
		343	for (pri = NUM_PRI; pri--; )
111	{	344	{
112	pthread_mutex_lock (&reslock);	345	aio_req req = q->qs[pri];
113	req = ress;
114		346
115	if (req)	347	if (req)
116	{	348	{
117	ress = req->next;	349	if (!(q->qs[pri] = req->next))
		350	q->qe[pri] = 0;
118		351
119	if (!ress)	352	return req;
		353	}
		354	}
		355
		356	abort ();
		357	}
		358
		359	static int poll_cb ();
		360	static int req_invoke (aio_req req);
		361	static void req_free (aio_req req);
		362	static void req_cancel (aio_req req);
		363
		364	/* must be called at most once */
		365	static SV *req_sv (aio_req req, const char *klass)
		366	{
		367	if (!req->self)
		368	{
		369	req->self = (SV *)newHV ();
		370	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		371	}
		372
		373	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		374	}
		375
		376	static aio_req SvAIO_REQ (SV *sv)
		377	{
		378	MAGIC *mg;
		379
		380	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		381	croak ("object of class " AIO_REQ_KLASS " expected");
		382
		383	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		384
		385	return mg ? (aio_req)mg->mg_ptr : 0;
		386	}
		387
		388	static void aio_grp_feed (aio_req grp)
		389	{
		390	block_sig ();
		391
		392	while (grp->size < grp->int2 && !(grp->flags & FLAG_CANCELLED))
		393	{
		394	int old_len = grp->size;
		395
		396	if (grp->sv2 && SvOK (grp->sv2))
		397	{
		398	dSP;
		399
		400	ENTER;
		401	SAVETMPS;
		402	PUSHMARK (SP);
		403	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		404	PUTBACK;
		405	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		406	SPAGAIN;
		407	FREETMPS;
		408	LEAVE;
		409	}
		410
		411	/* stop if no progress has been made */
		412	if (old_len == grp->size)
		413	{
		414	SvREFCNT_dec (grp->sv2);
		415	grp->sv2 = 0;
		416	break;
		417	}
		418	}
		419
		420	unblock_sig ();
		421	}
		422
		423	static void aio_grp_dec (aio_req grp)
		424	{
		425	--grp->size;
		426
		427	/* call feeder, if applicable */
		428	aio_grp_feed (grp);
		429
		430	/* finish, if done */
		431	if (!grp->size && grp->int1)
		432	{
		433	block_sig ();
		434
		435	if (!req_invoke (grp))
		436	{
		437	req_free (grp);
		438	unblock_sig ();
		439	croak (0);
		440	}
		441
		442	req_free (grp);
		443	unblock_sig ();
		444	}
		445	}
		446
		447	static int req_invoke (aio_req req)
		448	{
		449	dSP;
		450
		451	if (req->flags & FLAG_SV1_RO_OFF)
		452	SvREADONLY_off (req->sv1);
		453
		454	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		455	{
		456	ENTER;
		457	SAVETMPS;
		458	PUSHMARK (SP);
		459	EXTEND (SP, 1);
		460
		461	switch (req->type)
		462	{
		463	case REQ_READDIR:
120	{	464	{
121	/* read any signals sent by the worker threads */	465	SV *rv = &PL_sv_undef;
122	char buf [32];	466
123	while (read (respipe [0], buf, 32) == 32)	467	if (req->result >= 0)
124	;	468	{
		469	int i;
		470	char *buf = req->ptr2;
		471	AV *av = newAV ();
125		472
126	rese = 0;	473	av_extend (av, req->result - 1);
		474
		475	for (i = 0; i < req->result; ++i)
		476	{
		477	SV *sv = newSVpv (buf, 0);
		478
		479	av_store (av, i, sv);
		480	buf += SvCUR (sv) + 1;
		481	}
		482
		483	rv = sv_2mortal (newRV_noinc ((SV *)av));
		484	}
		485
		486	PUSHs (rv);
127	}	487	}
128	}
129
130	pthread_mutex_unlock (&reslock);
131
132	if (!req)
133	break;	488	break;
134		489
135	nreqs--;	490	case REQ_OPEN:
136
137	if (req->type == REQ_QUIT)
138	started--;
139	else
140	{
141	int errorno = errno;
142	errno = req->errorno;
143
144	if (req->type == REQ_READ)
145	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
146
147	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
148	SvREADONLY_off (req->data);
149
150	if (req->statdata)
151	{
152	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
153	PL_laststatval = req->result;
154	PL_statcache = *(req->statdata);
155	}
156
157	ENTER;
158	PUSHMARK (SP);
159	XPUSHs (sv_2mortal (newSViv (req->result)));
160
161	if (req->type == REQ_OPEN)
162	{	491	{
163	/* convert fd to fh */	492	/* convert fd to fh */
164	SV *fh;	493	SV *fh;
165		494
		495	PUSHs (sv_2mortal (newSViv (req->result)));
166	PUTBACK;	496	PUTBACK;
167	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	497	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
168	SPAGAIN;	498	SPAGAIN;
169		499
170	fh = SvREFCNT_inc (POPs);	500	fh = POPs;
171
172	PUSHMARK (SP);	501	PUSHMARK (SP);
173	XPUSHs (sv_2mortal (fh));	502	XPUSHs (fh);
174	}	503	}
		504	break;
175		505
176	if (SvOK (req->callback))	506	case REQ_GROUP:
		507	req->int1 = 2; /* mark group as finished */
		508
		509	if (req->sv1)
		510	{
		511	int i;
		512	AV *av = (AV *)req->sv1;
		513
		514	EXTEND (SP, AvFILL (av) + 1);
		515	for (i = 0; i <= AvFILL (av); ++i)
		516	PUSHs (*av_fetch (av, i, 0));
		517	}
		518	break;
		519
		520	case REQ_NOP:
		521	case REQ_BUSY:
		522	break;
		523
		524	case REQ_READLINK:
		525	if (req->result > 0)
		526	{
		527	SvCUR_set (req->sv1, req->result);
		528	*SvEND (req->sv1) = 0;
		529	PUSHs (req->sv1);
		530	}
		531	break;
		532
		533	case REQ_STAT:
		534	case REQ_LSTAT:
		535	case REQ_FSTAT:
		536	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		537	PL_laststatval = req->result;
		538	PL_statcache = *(Stat_t *)(req->ptr2);
		539	PUSHs (sv_2mortal (newSViv (req->result)));
		540	break;
		541
		542	case REQ_READ:
		543	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		544	*SvEND (req->sv1) = 0;
		545	PUSHs (sv_2mortal (newSViv (req->result)));
		546	break;
		547
		548	default:
		549	PUSHs (sv_2mortal (newSViv (req->result)));
		550	break;
		551	}
		552
		553	errno = req->errorno;
		554
		555	PUTBACK;
		556	call_sv (req->callback, G_VOID | G_EVAL);
		557	SPAGAIN;
		558
		559	FREETMPS;
		560	LEAVE;
		561	}
		562
		563	if (req->grp)
		564	{
		565	aio_req grp = req->grp;
		566
		567	/* unlink request */
		568	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		569	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		570
		571	if (grp->grp_first == req)
		572	grp->grp_first = req->grp_next;
		573
		574	aio_grp_dec (grp);
		575	}
		576
		577	return !SvTRUE (ERRSV);
		578	}
		579
		580	static void req_free (aio_req req)
		581	{
		582	if (req->self)
		583	{
		584	sv_unmagic (req->self, PERL_MAGIC_ext);
		585	SvREFCNT_dec (req->self);
		586	}
		587
		588	SvREFCNT_dec (req->fh);
		589	SvREFCNT_dec (req->sv1);
		590	SvREFCNT_dec (req->sv2);
		591	SvREFCNT_dec (req->callback);
		592
		593	if (req->flags & FLAG_PTR2_FREE)
		594	free (req->ptr2);
		595
		596	Safefree (req);
		597	}
		598
		599	static void req_cancel_subs (aio_req grp)
		600	{
		601	aio_req sub;
		602
		603	if (grp->type != REQ_GROUP)
		604	return;
		605
		606	SvREFCNT_dec (grp->sv2);
		607	grp->sv2 = 0;
		608
		609	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		610	req_cancel (sub);
		611	}
		612
		613	static void req_cancel (aio_req req)
		614	{
		615	req->flags |= FLAG_CANCELLED;
		616
		617	req_cancel_subs (req);
		618	}
		619
		620	static void *aio_proc(void *arg);
		621
		622	static void start_thread (void)
		623	{
		624	sigset_t fullsigset, oldsigset;
		625	pthread_attr_t attr;
		626
		627	worker *wrk = calloc (1, sizeof (worker));
		628
		629	if (!wrk)
		630	croak ("unable to allocate worker thread data");
		631
		632	pthread_attr_init (&attr);
		633	pthread_attr_setstacksize (&attr, STACKSIZE);
		634	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		635	#ifdef PTHREAD_SCOPE_PROCESS
		636	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		637	#endif
		638
		639	sigfillset (&fullsigset);
		640
		641	LOCK (wrklock);
		642	pthread_sigmask (SIG_SETMASK, &fullsigset, &oldsigset);
		643
		644	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
		645	{
		646	wrk->prev = &wrk_first;
		647	wrk->next = wrk_first.next;
		648	wrk_first.next->prev = wrk;
		649	wrk_first.next = wrk;
		650	++started;
		651	}
		652	else
		653	free (wrk);
		654
		655	pthread_sigmask (SIG_SETMASK, &oldsigset, 0);
		656	UNLOCK (wrklock);
		657	}
		658
		659	static void maybe_start_thread ()
		660	{
		661	if (get_nthreads () >= wanted)
		662	return;
		663
		664	/* todo: maybe use idle here, but might be less exact */
		665	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		666	return;
		667
		668	start_thread ();
		669	}
		670
		671	static void req_send (aio_req req)
		672	{
		673	block_sig ();
		674
		675	++nreqs;
		676
		677	LOCK (reqlock);
		678	++nready;
		679	reqq_push (&req_queue, req);
		680	pthread_cond_signal (&reqwait);
		681	UNLOCK (reqlock);
		682
		683	unblock_sig ();
		684
		685	maybe_start_thread ();
		686	}
		687
		688	static void end_thread (void)
		689	{
		690	aio_req req;
		691
		692	Newz (0, req, 1, aio_cb);
		693
		694	req->type = REQ_QUIT;
		695	req->pri = PRI_MAX + PRI_BIAS;
		696
		697	LOCK (reqlock);
		698	reqq_push (&req_queue, req);
		699	pthread_cond_signal (&reqwait);
		700	UNLOCK (reqlock);
		701
		702	LOCK (wrklock);
		703	--started;
		704	UNLOCK (wrklock);
		705	}
		706
		707	static void set_max_idle (int nthreads)
		708	{
		709	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		710	max_idle = nthreads <= 0 ? 1 : nthreads;
		711	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
		712	}
		713
		714	static void min_parallel (int nthreads)
		715	{
		716	if (wanted < nthreads)
		717	wanted = nthreads;
		718	}
		719
		720	static void max_parallel (int nthreads)
		721	{
		722	if (wanted > nthreads)
		723	wanted = nthreads;
		724
		725	while (started > wanted)
		726	end_thread ();
		727	}
		728
		729	static void poll_wait ()
		730	{
		731	fd_set rfd;
		732
		733	while (nreqs)
		734	{
		735	int size;
		736	if (WORDACCESS_UNSAFE) LOCK (reslock);
		737	size = res_queue.size;
		738	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		739
		740	if (size)
		741	return;
		742
		743	maybe_start_thread ();
		744
		745	FD_ZERO(&rfd);
		746	FD_SET(respipe [0], &rfd);
		747
		748	select (respipe [0] + 1, &rfd, 0, 0, 0);
		749	}
		750	}
		751
		752	static int poll_cb ()
		753	{
		754	dSP;
		755	int count = 0;
		756	int maxreqs = max_poll_reqs;
		757	int do_croak = 0;
		758	struct timeval tv_start, tv_now;
		759	aio_req req;
		760
		761	if (max_poll_time)
		762	gettimeofday (&tv_start, 0);
		763
		764	block_sig ();
		765
		766	for (;;)
		767	{
		768	for (;;)
		769	{
		770	maybe_start_thread ();
		771
		772	LOCK (reslock);
		773	req = reqq_shift (&res_queue);
		774
		775	if (req)
177	{	776	{
178	PUTBACK;	777	--npending;
179	call_sv (req->callback, G_VOID | G_EVAL);
180	SPAGAIN;
181		778
182	if (SvTRUE (ERRSV))	779	if (!res_queue.size)
183	{	780	{
		781	/* read any signals sent by the worker threads */
		782	char buf [4];
		783	while (read (respipe [0], buf, 4) == 4)
		784	;
		785	}
		786	}
		787
		788	UNLOCK (reslock);
		789
		790	if (!req)
		791	break;
		792
		793	--nreqs;
		794
		795	if (req->type == REQ_GROUP && req->size)
		796	{
		797	req->int1 = 1; /* mark request as delayed */
		798	continue;
		799	}
		800	else
		801	{
		802	if (!req_invoke (req))
		803	{
184	free_req (req);	804	req_free (req);
		805	unblock_sig ();
185	croak (0);	806	croak (0);
186	}	807	}
		808
		809	count++;
187	}	810	}
188		811
189	LEAVE;	812	req_free (req);
190		813
191	errno = errorno;	814	if (maxreqs && !--maxreqs)
192	count++;	815	break;
		816
		817	if (max_poll_time)
		818	{
		819	gettimeofday (&tv_now, 0);
		820
		821	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
		822	break;
		823	}
193	}	824	}
194		825
195	free_req (req);	826	if (nreqs <= max_outstanding)
		827	break;
		828
		829	poll_wait ();
		830
		831	++maxreqs;
196	}	832	}
197		833
		834	unblock_sig ();
198	return count;	835	return count;
199	}
200
201	static void *aio_proc(void *arg);
202
203	static void
204	start_thread (void)
205	{
206	sigset_t fullsigset, oldsigset;
207	pthread_t tid;
208	pthread_attr_t attr;
209
210	pthread_attr_init (&attr);
211	pthread_attr_setstacksize (&attr, STACKSIZE);
212	// pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
213
214	sigfillset (&fullsigset);
215	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
216
217	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
218	started++;
219
220	sigprocmask (SIG_SETMASK, &oldsigset, 0);
221	}
222
223	static void
224	send_req (aio_req req)
225	{
226	while (started < wanted && nreqs >= started)
227	start_thread ();
228
229	nreqs++;
230
231	pthread_mutex_lock (&reqlock);
232
233	req->next = 0;
234
235	if (reqe)
236	{
237	reqe->next = req;
238	reqe = req;
239	}
240	else
241	reqe = reqs = req;
242
243	pthread_cond_signal (&reqwait);
244	pthread_mutex_unlock (&reqlock);
245
246	if (nreqs > max_outstanding)
247	for (;;)
248	{
249	poll_cb ();
250
251	if (nreqs <= max_outstanding)
252	break;
253
254	poll_wait ();
255	}
256	}
257
258	static void
259	end_thread (void)
260	{
261	aio_req req;
262	Newz (0, req, 1, aio_cb);
263	req->type = REQ_QUIT;
264
265	send_req (req);
266	}
267
268	static void min_parallel (int nthreads)
269	{
270	if (wanted < nthreads)
271	wanted = nthreads;
272	}
273
274	static void max_parallel (int nthreads)
275	{
276	int cur = started;
277
278	if (wanted > nthreads)
279	wanted = nthreads;
280
281	while (cur > wanted)
282	{
283	end_thread ();
284	cur--;
285	}
286
287	while (started > wanted)
288	{
289	poll_wait ();
290	poll_cb ();
291	}
292	}	836	}
293		837
294	static void create_pipe ()	838	static void create_pipe ()
295	{	839	{
296	if (pipe (respipe))	840	if (pipe (respipe))
…		…
299	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	843	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
300	croak ("cannot set result pipe to nonblocking mode");	844	croak ("cannot set result pipe to nonblocking mode");
301		845
302	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	846	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
303	croak ("cannot set result pipe to nonblocking mode");	847	croak ("cannot set result pipe to nonblocking mode");
304	}
305
306	static void atfork_prepare (void)
307	{
308	pthread_mutex_lock (&reqlock);
309	pthread_mutex_lock (&reslock);
310	}
311
312	static void atfork_parent (void)
313	{
314	pthread_mutex_unlock (&reslock);
315	pthread_mutex_unlock (&reqlock);
316	}
317
318	static void atfork_child (void)
319	{
320	aio_req prv;
321
322	started = 0;
323
324	while (reqs)
325	{
326	prv = reqs;
327	reqs = prv->next;
328	free_req (prv);
329	}
330
331	reqs = reqe = 0;
332
333	while (ress)
334	{
335	prv = ress;
336	ress = prv->next;
337	free_req (prv);
338	}
339
340	ress = rese = 0;
341
342	close (respipe [0]);
343	close (respipe [1]);
344	create_pipe ();
345
346	atfork_parent ();
347	}	848	}
348		849
349	/*****************************************************************************/	850	/*****************************************************************************/
350	/* work around various missing functions */	851	/* work around various missing functions */
351		852
…		…
356	/*	857	/*
357	* make our pread/pwrite safe against themselves, but not against	858	* make our pread/pwrite safe against themselves, but not against
358	* normal read/write by using a mutex. slows down execution a lot,	859	* normal read/write by using a mutex. slows down execution a lot,
359	* but that's your problem, not mine.	860	* but that's your problem, not mine.
360	*/	861	*/
361	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	862	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
362		863
363	static ssize_t	864	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
364	pread (int fd, void *buf, size_t count, off_t offset)
365	{	865	{
366	ssize_t res;	866	ssize_t res;
367	off_t ooffset;	867	off_t ooffset;
368		868
369	pthread_mutex_lock (&iolock);	869	LOCK (preadwritelock);
370	ooffset = lseek (fd, 0, SEEK_CUR);	870	ooffset = lseek (fd, 0, SEEK_CUR);
371	lseek (fd, offset, SEEK_SET);	871	lseek (fd, offset, SEEK_SET);
372	res = read (fd, buf, count);	872	res = read (fd, buf, count);
373	lseek (fd, ooffset, SEEK_SET);	873	lseek (fd, ooffset, SEEK_SET);
374	pthread_mutex_unlock (&iolock);	874	UNLOCK (preadwritelock);
375		875
376	return res;	876	return res;
377	}	877	}
378		878
379	static ssize_t
380	pwrite (int fd, void *buf, size_t count, off_t offset)	879	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
381	{	880	{
382	ssize_t res;	881	ssize_t res;
383	off_t ooffset;	882	off_t ooffset;
384		883
385	pthread_mutex_lock (&iolock);	884	LOCK (preadwritelock);
386	ooffset = lseek (fd, 0, SEEK_CUR);	885	ooffset = lseek (fd, 0, SEEK_CUR);
387	lseek (fd, offset, SEEK_SET);	886	lseek (fd, offset, SEEK_SET);
388	res = write (fd, buf, count);	887	res = write (fd, buf, count);
389	lseek (fd, offset, SEEK_SET);	888	lseek (fd, offset, SEEK_SET);
390	pthread_mutex_unlock (&iolock);	889	UNLOCK (preadwritelock);
391		890
392	return res;	891	return res;
393	}	892	}
394	#endif	893	#endif
395		894
396	#if !HAVE_FDATASYNC	895	#if !HAVE_FDATASYNC
397	# define fdatasync fsync	896	# define fdatasync fsync
398	#endif	897	#endif
399		898
400	#if !HAVE_READAHEAD	899	#if !HAVE_READAHEAD
401	# define readahead aio_readahead	900	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
402		901
403	static char readahead_buf[4096];	902	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
404
405	static ssize_t
406	readahead (int fd, off_t offset, size_t count)
407	{	903	{
		904	dBUF;
		905
408	while (count > 0)	906	while (count > 0)
409	{	907	{
410	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	908	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
411		909
412	pread (fd, readahead_buf, len, offset);	910	pread (fd, aio_buf, len, offset);
413	offset += len;	911	offset += len;
414	count -= len;	912	count -= len;
415	}	913	}
416		914
417	errno = 0;	915	errno = 0;
418	}	916	}
		917
419	#endif	918	#endif
420		919
		920	#if !HAVE_READDIR_R
		921	# define readdir_r aio_readdir_r
		922
		923	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		924
		925	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		926	{
		927	struct dirent *e;
		928	int errorno;
		929
		930	LOCK (readdirlock);
		931
		932	e = readdir (dirp);
		933	errorno = errno;
		934
		935	if (e)
		936	{
		937	*res = ent;
		938	strcpy (ent->d_name, e->d_name);
		939	}
		940	else
		941	*res = 0;
		942
		943	UNLOCK (readdirlock);
		944
		945	errno = errorno;
		946	return e ? 0 : -1;
		947	}
		948	#endif
		949
		950	/* sendfile always needs emulation */
		951	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
		952	{
		953	ssize_t res;
		954
		955	if (!count)
		956	return 0;
		957
		958	#if HAVE_SENDFILE
		959	# if __linux
		960	res = sendfile (ofd, ifd, &offset, count);
		961
		962	# elif __freebsd
		963	/*
		964	* Of course, the freebsd sendfile is a dire hack with no thoughts
		965	* wasted on making it similar to other I/O functions.
		966	*/
		967	{
		968	off_t sbytes;
		969	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		970
		971	if (res < 0 && sbytes)
		972	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
		973	res = sbytes;
		974	}
		975
		976	# elif __hpux
		977	res = sendfile (ofd, ifd, offset, count, 0, 0);
		978
		979	# elif __solaris
		980	{
		981	struct sendfilevec vec;
		982	size_t sbytes;
		983
		984	vec.sfv_fd = ifd;
		985	vec.sfv_flag = 0;
		986	vec.sfv_off = offset;
		987	vec.sfv_len = count;
		988
		989	res = sendfilev (ofd, &vec, 1, &sbytes);
		990
		991	if (res < 0 && sbytes)
		992	res = sbytes;
		993	}
		994
		995	# endif
		996	#else
		997	res = -1;
		998	errno = ENOSYS;
		999	#endif
		1000
		1001	if (res < 0
		1002	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		1003	#if __solaris
		1004	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		1005	#endif
		1006	)
		1007	)
		1008	{
		1009	/* emulate sendfile. this is a major pain in the ass */
		1010	dBUF;
		1011
		1012	res = 0;
		1013
		1014	while (count)
		1015	{
		1016	ssize_t cnt;
		1017
		1018	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
		1019
		1020	if (cnt <= 0)
		1021	{
		1022	if (cnt && !res) res = -1;
		1023	break;
		1024	}
		1025
		1026	cnt = write (ofd, aio_buf, cnt);
		1027
		1028	if (cnt <= 0)
		1029	{
		1030	if (cnt && !res) res = -1;
		1031	break;
		1032	}
		1033
		1034	offset += cnt;
		1035	res += cnt;
		1036	count -= cnt;
		1037	}
		1038	}
		1039
		1040	return res;
		1041	}
		1042
		1043	/* read a full directory */
		1044	static void scandir_ (aio_req req, worker *self)
		1045	{
		1046	DIR *dirp;
		1047	union
		1048	{
		1049	struct dirent d;
		1050	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		1051	} *u;
		1052	struct dirent *entp;
		1053	char *name, *names;
		1054	int memlen = 4096;
		1055	int memofs = 0;
		1056	int res = 0;
		1057	int errorno;
		1058
		1059	LOCK (wrklock);
		1060	self->dirp = dirp = opendir (req->ptr1);
		1061	self->dbuf = u = malloc (sizeof (*u));
		1062	req->flags |= FLAG_PTR2_FREE;
		1063	req->ptr2 = names = malloc (memlen);
		1064	UNLOCK (wrklock);
		1065
		1066	if (dirp && u && names)
		1067	for (;;)
		1068	{
		1069	errno = 0;
		1070	readdir_r (dirp, &u->d, &entp);
		1071
		1072	if (!entp)
		1073	break;
		1074
		1075	name = entp->d_name;
		1076
		1077	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1078	{
		1079	int len = strlen (name) + 1;
		1080
		1081	res++;
		1082
		1083	while (memofs + len > memlen)
		1084	{
		1085	memlen *= 2;
		1086	LOCK (wrklock);
		1087	req->ptr2 = names = realloc (names, memlen);
		1088	UNLOCK (wrklock);
		1089
		1090	if (!names)
		1091	break;
		1092	}
		1093
		1094	memcpy (names + memofs, name, len);
		1095	memofs += len;
		1096	}
		1097	}
		1098
		1099	if (errno)
		1100	res = -1;
		1101
		1102	req->result = res;
		1103	}
		1104
421	/*****************************************************************************/	1105	/*****************************************************************************/
422		1106
423	static void *
424	aio_proc (void *thr_arg)	1107	static void *aio_proc (void *thr_arg)
425	{	1108	{
426	aio_req req;	1109	aio_req req;
427	int type;	1110	struct timespec ts;
		1111	worker *self = (worker *)thr_arg;
428		1112
429	do	1113	/* try to distribute timeouts somewhat evenly */
		1114	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1115	* (1000000000UL / 1024UL);
		1116
		1117	for (;;)
430	{	1118	{
431	pthread_mutex_lock (&reqlock);	1119	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1120
		1121	LOCK (reqlock);
432		1122
433	for (;;)	1123	for (;;)
434	{	1124	{
435	req = reqs;	1125	self->req = req = reqq_shift (&req_queue);
436
437	if (reqs)
438	{
439	reqs = reqs->next;
440	if (!reqs) reqe = 0;
441	}
442		1126
443	if (req)	1127	if (req)
444	break;	1128	break;
445		1129
		1130	++idle;
		1131
		1132	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1133	== ETIMEDOUT)
		1134	{
		1135	if (idle > max_idle)
		1136	{
		1137	--idle;
		1138	UNLOCK (reqlock);
		1139	LOCK (wrklock);
		1140	--started;
		1141	UNLOCK (wrklock);
		1142	goto quit;
		1143	}
		1144
		1145	/* we are allowed to idle, so do so without any timeout */
446	pthread_cond_wait (&reqwait, &reqlock);	1146	pthread_cond_wait (&reqwait, &reqlock);
		1147	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1148	}
		1149
		1150	--idle;
447	}	1151	}
448		1152
449	pthread_mutex_unlock (&reqlock);	1153	--nready;
		1154
		1155	UNLOCK (reqlock);
450		1156
451	errno = 0; /* strictly unnecessary */	1157	errno = 0; /* strictly unnecessary */
452		1158
453	type = req->type;	1159	if (!(req->flags & FLAG_CANCELLED))
454
455	switch (type)	1160	switch (req->type)
		1161	{
		1162	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
		1163	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
		1164
		1165	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
		1166	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
		1167
		1168	case REQ_STAT: req->result = stat (req->ptr1, (Stat_t *)req->ptr2); break;
		1169	case REQ_LSTAT: req->result = lstat (req->ptr1, (Stat_t *)req->ptr2); break;
		1170	case REQ_FSTAT: req->result = fstat (req->int1, (Stat_t *)req->ptr2); break;
		1171
		1172	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
		1173	case REQ_CLOSE: req->result = close (req->int1); break;
		1174	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
		1175	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
		1176	case REQ_MKDIR: req->result = mkdir (req->ptr1, req->mode); break;
		1177	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
		1178	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
		1179	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1180	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1181	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
		1182
		1183	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
		1184	case REQ_FSYNC: req->result = fsync (req->int1); break;
		1185	case REQ_READDIR: scandir_ (req, self); break;
		1186
		1187	case REQ_BUSY:
		1188	{
		1189	struct timeval tv;
		1190
		1191	tv.tv_sec = req->int1;
		1192	tv.tv_usec = req->int2;
		1193
		1194	req->result = select (0, 0, 0, 0, &tv);
		1195	}
		1196
		1197	case REQ_GROUP:
		1198	case REQ_NOP:
		1199	break;
		1200
		1201	case REQ_QUIT:
		1202	goto quit;
		1203
		1204	default:
		1205	req->result = ENOSYS;
		1206	break;
		1207	}
		1208
		1209	req->errorno = errno;
		1210
		1211	LOCK (reslock);
		1212
		1213	++npending;
		1214
		1215	if (!reqq_push (&res_queue, req))
456	{	1216	{
457	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
458	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
459
460	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
461
462	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
463	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
464	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
465
466	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
467	case REQ_CLOSE: req->result = close (req->fd); break;
468	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
469	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
470	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
471
472	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
473	case REQ_FSYNC: req->result = fsync (req->fd); break;
474
475	case REQ_QUIT:
476	break;
477
478	default:
479	req->result = ENOSYS;
480	break;
481	}
482
483	req->errorno = errno;
484
485	pthread_mutex_lock (&reslock);
486
487	req->next = 0;
488
489	if (rese)
490	{
491	rese->next = req;
492	rese = req;
493	}
494	else
495	{
496	rese = ress = req;
497
498	/* write a dummy byte to the pipe so fh becomes ready */	1217	/* write a dummy byte to the pipe so fh becomes ready */
499	write (respipe [1], &respipe, 1);	1218	write (respipe [1], &respipe, 1);
		1219
		1220	/* optionally signal the main thread asynchronously */
		1221	if (main_sig)
		1222	pthread_kill (main_tid, main_sig);
500	}	1223	}
501		1224
502	pthread_mutex_unlock (&reslock);	1225	self->req = 0;
		1226	worker_clear (self);
		1227
		1228	UNLOCK (reslock);
503	}	1229	}
504	while (type != REQ_QUIT);	1230
		1231	quit:
		1232	LOCK (wrklock);
		1233	worker_free (self);
		1234	UNLOCK (wrklock);
505		1235
506	return 0;	1236	return 0;
		1237	}
		1238
		1239	/*****************************************************************************/
		1240
		1241	static void atfork_prepare (void)
		1242	{
		1243	LOCK (wrklock);
		1244	LOCK (reqlock);
		1245	LOCK (reslock);
		1246	#if !HAVE_PREADWRITE
		1247	LOCK (preadwritelock);
		1248	#endif
		1249	#if !HAVE_READDIR_R
		1250	LOCK (readdirlock);
		1251	#endif
		1252	}
		1253
		1254	static void atfork_parent (void)
		1255	{
		1256	#if !HAVE_READDIR_R
		1257	UNLOCK (readdirlock);
		1258	#endif
		1259	#if !HAVE_PREADWRITE
		1260	UNLOCK (preadwritelock);
		1261	#endif
		1262	UNLOCK (reslock);
		1263	UNLOCK (reqlock);
		1264	UNLOCK (wrklock);
		1265	}
		1266
		1267	static void atfork_child (void)
		1268	{
		1269	aio_req prv;
		1270
		1271	while (prv = reqq_shift (&req_queue))
		1272	req_free (prv);
		1273
		1274	while (prv = reqq_shift (&res_queue))
		1275	req_free (prv);
		1276
		1277	while (wrk_first.next != &wrk_first)
		1278	{
		1279	worker *wrk = wrk_first.next;
		1280
		1281	if (wrk->req)
		1282	req_free (wrk->req);
		1283
		1284	worker_clear (wrk);
		1285	worker_free (wrk);
		1286	}
		1287
		1288	started = 0;
		1289	idle = 0;
		1290	nreqs = 0;
		1291	nready = 0;
		1292	npending = 0;
		1293
		1294	close (respipe [0]);
		1295	close (respipe [1]);
		1296	create_pipe ();
		1297
		1298	atfork_parent ();
507	}	1299	}
508		1300
509	#define dREQ \	1301	#define dREQ \
510	aio_req req; \	1302	aio_req req; \
		1303	int req_pri = next_pri; \
		1304	next_pri = DEFAULT_PRI + PRI_BIAS; \
511	\	1305	\
512	if (SvOK (callback) && !SvROK (callback)) \	1306	if (SvOK (callback) && !SvROK (callback)) \
513	croak ("clalback must be undef or of reference type"); \	1307	croak ("callback must be undef or of reference type"); \
514	\	1308	\
515	Newz (0, req, 1, aio_cb); \	1309	Newz (0, req, 1, aio_cb); \
516	if (!req) \	1310	if (!req) \
517	croak ("out of memory during aio_req allocation"); \	1311	croak ("out of memory during aio_req allocation"); \
518	\	1312	\
519	req->callback = newSVsv (callback);	1313	req->callback = newSVsv (callback); \
		1314	req->pri = req_pri
		1315
		1316	#define REQ_SEND \
		1317	req_send (req); \
		1318	\
		1319	if (GIMME_V != G_VOID) \
		1320	XPUSHs (req_sv (req, AIO_REQ_KLASS));
520		1321
521	MODULE = IO::AIO PACKAGE = IO::AIO	1322	MODULE = IO::AIO PACKAGE = IO::AIO
522		1323
523	PROTOTYPES: ENABLE	1324	PROTOTYPES: ENABLE
524		1325
525	BOOT:	1326	BOOT:
526	{	1327	{
		1328	HV *stash = gv_stashpv ("IO::AIO", 1);
		1329
		1330	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		1331	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1332	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1333	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1334	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1335	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		1336	newCONSTSUB (stash, "SIGIO", newSViv (SIGIO));
		1337
527	create_pipe ();	1338	create_pipe ();
528	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1339	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
529	}	1340	}
530		1341
531	void	1342	void
532	min_parallel(nthreads)	1343	max_poll_reqs (int nreqs)
533	int nthreads
534	PROTOTYPE: $	1344	PROTOTYPE: $
		1345	CODE:
		1346	max_poll_reqs = nreqs;
535		1347
536	void	1348	void
537	max_parallel(nthreads)	1349	max_poll_time (double nseconds)
538	int nthreads
539	PROTOTYPE: $	1350	PROTOTYPE: $
		1351	CODE:
		1352	max_poll_time = nseconds * AIO_TICKS;
		1353
		1354	void
		1355	min_parallel (int nthreads)
		1356	PROTOTYPE: $
		1357
		1358	void
		1359	max_parallel (int nthreads)
		1360	PROTOTYPE: $
		1361
		1362	void
		1363	max_idle (int nthreads)
		1364	PROTOTYPE: $
		1365	CODE:
		1366	set_max_idle (nthreads);
540		1367
541	int	1368	int
542	max_outstanding(nreqs)	1369	max_outstanding (int maxreqs)
543	int nreqs	1370	PROTOTYPE: $
544	PROTOTYPE: $
545	CODE:	1371	CODE:
546	RETVAL = max_outstanding;	1372	RETVAL = max_outstanding;
547	max_outstanding = nreqs;	1373	max_outstanding = maxreqs;
		1374	OUTPUT:
		1375	RETVAL
548		1376
549	void	1377	void
550	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1378	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
551	SV * pathname	1379	SV8 * pathname
552	int flags	1380	int flags
553	int mode	1381	int mode
554	SV * callback	1382	SV * callback
555	PROTOTYPE: $$$;$	1383	PROTOTYPE: $$$;$
556	CODE:	1384	PPCODE:
557	{	1385	{
558	dREQ;	1386	dREQ;
559		1387
560	req->type = REQ_OPEN;	1388	req->type = REQ_OPEN;
561	req->data = newSVsv (pathname);	1389	req->sv1 = newSVsv (pathname);
562	req->dataptr = SvPVbyte_nolen (req->data);	1390	req->ptr1 = SvPVbyte_nolen (req->sv1);
563	req->fd = flags;	1391	req->int1 = flags;
564	req->mode = mode;	1392	req->mode = mode;
565		1393
566	send_req (req);	1394	REQ_SEND;
567	}	1395	}
568		1396
569	void	1397	void
570	aio_close(fh,callback=&PL_sv_undef)	1398	aio_close (fh,callback=&PL_sv_undef)
571	SV * fh	1399	SV * fh
572	SV * callback	1400	SV * callback
573	PROTOTYPE: $;$	1401	PROTOTYPE: $;$
574	ALIAS:	1402	ALIAS:
575	aio_close = REQ_CLOSE	1403	aio_close = REQ_CLOSE
576	aio_fsync = REQ_FSYNC	1404	aio_fsync = REQ_FSYNC
577	aio_fdatasync = REQ_FDATASYNC	1405	aio_fdatasync = REQ_FDATASYNC
578	CODE:	1406	PPCODE:
579	{	1407	{
580	dREQ;	1408	dREQ;
581		1409
582	req->type = ix;	1410	req->type = ix;
583	req->fh = newSVsv (fh);	1411	req->fh = newSVsv (fh);
584	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1412	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
585		1413
586	send_req (req);	1414	REQ_SEND (req);
587	}	1415	}
588		1416
589	void	1417	void
590	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1418	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
591	SV * fh	1419	SV * fh
592	UV offset	1420	UV offset
593	IV length	1421	UV length
594	SV * data	1422	SV8 * data
595	IV dataoffset	1423	UV dataoffset
596	SV * callback	1424	SV * callback
597	ALIAS:	1425	ALIAS:
598	aio_read = REQ_READ	1426	aio_read = REQ_READ
599	aio_write = REQ_WRITE	1427	aio_write = REQ_WRITE
600	PROTOTYPE: $$$$$;$	1428	PROTOTYPE: $$$$$;$
601	CODE:	1429	PPCODE:
602	{	1430	{
603	aio_req req;
604	STRLEN svlen;	1431	STRLEN svlen;
605	char *svptr = SvPVbyte (data, svlen);	1432	char *svptr = SvPVbyte (data, svlen);
606		1433
607	SvUPGRADE (data, SVt_PV);	1434	SvUPGRADE (data, SVt_PV);
608	SvPOK_on (data);	1435	SvPOK_on (data);
…		…
620	length = svlen - dataoffset;	1447	length = svlen - dataoffset;
621	}	1448	}
622	else	1449	else
623	{	1450	{
624	/* read: grow scalar as necessary */	1451	/* read: grow scalar as necessary */
625	svptr = SvGROW (data, length + dataoffset);	1452	svptr = SvGROW (data, length + dataoffset + 1);
626	}	1453	}
627		1454
628	if (length < 0)	1455	if (length < 0)
629	croak ("length must not be negative");	1456	croak ("length must not be negative");
630		1457
631	{	1458	{
632	dREQ;	1459	dREQ;
633		1460
634	req->type = ix;	1461	req->type = ix;
635	req->fh = newSVsv (fh);	1462	req->fh = newSVsv (fh);
636	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1463	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
637	: IoOFP (sv_2io (fh)));	1464	: IoOFP (sv_2io (fh)));
638	req->offset = offset;	1465	req->offs = offset;
639	req->length = length;	1466	req->size = length;
640	req->data = SvREFCNT_inc (data);	1467	req->sv1 = SvREFCNT_inc (data);
641	req->dataptr = (char *)svptr + dataoffset;	1468	req->ptr1 = (char *)svptr + dataoffset;
		1469	req->stroffset = dataoffset;
642		1470
643	if (!SvREADONLY (data))	1471	if (!SvREADONLY (data))
644	{	1472	{
645	SvREADONLY_on (data);	1473	SvREADONLY_on (data);
646	req->data2ptr = (void *)data;	1474	req->flags |= FLAG_SV1_RO_OFF;
647	}	1475	}
648		1476
649	send_req (req);	1477	REQ_SEND;
650	}	1478	}
651	}	1479	}
652		1480
653	void	1481	void
		1482	aio_readlink (path,callback=&PL_sv_undef)
		1483	SV8 * path
		1484	SV * callback
		1485	PROTOTYPE: $$;$
		1486	PPCODE:
		1487	{
		1488	SV *data;
		1489	dREQ;
		1490
		1491	data = newSV (NAME_MAX);
		1492	SvPOK_on (data);
		1493
		1494	req->type = REQ_READLINK;
		1495	req->fh = newSVsv (path);
		1496	req->ptr2 = SvPVbyte_nolen (req->fh);
		1497	req->sv1 = data;
		1498	req->ptr1 = SvPVbyte_nolen (data);
		1499
		1500	REQ_SEND;
		1501	}
		1502
		1503	void
		1504	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1505	SV * out_fh
		1506	SV * in_fh
		1507	UV in_offset
		1508	UV length
		1509	SV * callback
		1510	PROTOTYPE: $$$$;$
		1511	PPCODE:
		1512	{
		1513	dREQ;
		1514
		1515	req->type = REQ_SENDFILE;
		1516	req->fh = newSVsv (out_fh);
		1517	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1518	req->sv2 = newSVsv (in_fh);
		1519	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1520	req->offs = in_offset;
		1521	req->size = length;
		1522
		1523	REQ_SEND;
		1524	}
		1525
		1526	void
654	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1527	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
655	SV * fh	1528	SV * fh
656	UV offset	1529	UV offset
657	IV length	1530	IV length
658	SV * callback	1531	SV * callback
659	PROTOTYPE: $$$;$	1532	PROTOTYPE: $$$;$
660	CODE:	1533	PPCODE:
661	{	1534	{
662	dREQ;	1535	dREQ;
663		1536
664	req->type = REQ_READAHEAD;	1537	req->type = REQ_READAHEAD;
665	req->fh = newSVsv (fh);	1538	req->fh = newSVsv (fh);
666	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1539	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
667	req->offset = offset;	1540	req->offs = offset;
668	req->length = length;	1541	req->size = length;
669		1542
670	send_req (req);	1543	REQ_SEND;
671	}	1544	}
672		1545
673	void	1546	void
674	aio_stat(fh_or_path,callback=&PL_sv_undef)	1547	aio_stat (fh_or_path,callback=&PL_sv_undef)
675	SV * fh_or_path	1548	SV8 * fh_or_path
676	SV * callback	1549	SV * callback
677	ALIAS:	1550	ALIAS:
678	aio_stat = REQ_STAT	1551	aio_stat = REQ_STAT
679	aio_lstat = REQ_LSTAT	1552	aio_lstat = REQ_LSTAT
680	CODE:	1553	PPCODE:
681	{	1554	{
682	dREQ;	1555	dREQ;
683		1556
684	New (0, req->statdata, 1, Stat_t);	1557	req->ptr2 = malloc (sizeof (Stat_t));
685	if (!req->statdata)	1558	if (!req->ptr2)
686	{	1559	{
687	free_req (req);	1560	req_free (req);
688	croak ("out of memory during aio_req->statdata allocation");	1561	croak ("out of memory during aio_stat statdata allocation");
689	}	1562	}
		1563
		1564	req->flags |= FLAG_PTR2_FREE;
690		1565
691	if (SvPOK (fh_or_path))	1566	if (SvPOK (fh_or_path))
692	{	1567	{
693	req->type = ix;	1568	req->type = ix;
694	req->data = newSVsv (fh_or_path);	1569	req->sv1 = newSVsv (fh_or_path);
695	req->dataptr = SvPVbyte_nolen (req->data);	1570	req->ptr1 = SvPVbyte_nolen (req->sv1);
696	}	1571	}
697	else	1572	else
698	{	1573	{
699	req->type = REQ_FSTAT;	1574	req->type = REQ_FSTAT;
700	req->fh = newSVsv (fh_or_path);	1575	req->fh = newSVsv (fh_or_path);
701	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1576	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
702	}	1577	}
703		1578
704	send_req (req);	1579	REQ_SEND;
705	}	1580	}
706		1581
707	void	1582	void
708	aio_unlink(pathname,callback=&PL_sv_undef)	1583	aio_unlink (pathname,callback=&PL_sv_undef)
709	SV * pathname	1584	SV8 * pathname
710	SV * callback	1585	SV * callback
711	ALIAS:	1586	ALIAS:
712	aio_unlink = REQ_UNLINK	1587	aio_unlink = REQ_UNLINK
713	aio_rmdir = REQ_RMDIR	1588	aio_rmdir = REQ_RMDIR
		1589	aio_readdir = REQ_READDIR
714	CODE:	1590	PPCODE:
715	{	1591	{
716	dREQ;	1592	dREQ;
717		1593
718	req->type = ix;	1594	req->type = ix;
719	req->data = newSVsv (pathname);	1595	req->sv1 = newSVsv (pathname);
720	req->dataptr = SvPVbyte_nolen (req->data);	1596	req->ptr1 = SvPVbyte_nolen (req->sv1);
721
722	send_req (req);
723	}
724		1597
		1598	REQ_SEND;
		1599	}
		1600
725	void	1601	void
726	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1602	aio_mkdir (pathname,mode,callback=&PL_sv_undef)
727	SV * oldpath	1603	SV8 * pathname
728	SV * newpath	1604	UV mode
729	SV * callback	1605	SV * callback
730	CODE:	1606	PPCODE:
731	{	1607	{
732	dREQ;	1608	dREQ;
733		1609
734	req->type = REQ_SYMLINK;	1610	req->type = REQ_MKDIR;
735	req->fh = newSVsv (oldpath);	1611	req->sv1 = newSVsv (pathname);
736	req->data2ptr = SvPVbyte_nolen (req->fh);	1612	req->ptr1 = SvPVbyte_nolen (req->sv1);
737	req->data = newSVsv (newpath);	1613	req->mode = mode;
738	req->dataptr = SvPVbyte_nolen (req->data);	1614
		1615	REQ_SEND;
		1616	}
		1617
		1618	void
		1619	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1620	SV8 * oldpath
		1621	SV8 * newpath
		1622	SV * callback
		1623	ALIAS:
		1624	aio_link = REQ_LINK
		1625	aio_symlink = REQ_SYMLINK
		1626	aio_rename = REQ_RENAME
		1627	PPCODE:
		1628	{
		1629	dREQ;
739		1630
740	send_req (req);	1631	req->type = ix;
		1632	req->fh = newSVsv (oldpath);
		1633	req->ptr2 = SvPVbyte_nolen (req->fh);
		1634	req->sv1 = newSVsv (newpath);
		1635	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1636
		1637	REQ_SEND;
741	}	1638	}
742		1639
743	void	1640	void
		1641	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
		1642	SV8 * pathname
		1643	UV mode
		1644	UV dev
		1645	SV * callback
		1646	PPCODE:
		1647	{
		1648	dREQ;
		1649
		1650	req->type = REQ_MKNOD;
		1651	req->sv1 = newSVsv (pathname);
		1652	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1653	req->mode = (mode_t)mode;
		1654	req->offs = dev;
		1655
		1656	REQ_SEND;
		1657	}
		1658
		1659	void
		1660	aio_busy (delay,callback=&PL_sv_undef)
		1661	double delay
		1662	SV * callback
		1663	PPCODE:
		1664	{
		1665	dREQ;
		1666
		1667	req->type = REQ_BUSY;
		1668	req->int1 = delay < 0. ? 0 : delay;
		1669	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
		1670
		1671	REQ_SEND;
		1672	}
		1673
		1674	void
		1675	aio_group (callback=&PL_sv_undef)
		1676	SV * callback
		1677	PROTOTYPE: ;$
		1678	PPCODE:
		1679	{
		1680	dREQ;
		1681
		1682	req->type = REQ_GROUP;
		1683
		1684	req_send (req);
		1685	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1686	}
		1687
		1688	void
		1689	aio_nop (callback=&PL_sv_undef)
		1690	SV * callback
		1691	PPCODE:
		1692	{
		1693	dREQ;
		1694
		1695	req->type = REQ_NOP;
		1696
		1697	REQ_SEND;
		1698	}
		1699
		1700	int
		1701	aioreq_pri (int pri = 0)
		1702	PROTOTYPE: ;$
		1703	CODE:
		1704	RETVAL = next_pri - PRI_BIAS;
		1705	if (items > 0)
		1706	{
		1707	if (pri < PRI_MIN) pri = PRI_MIN;
		1708	if (pri > PRI_MAX) pri = PRI_MAX;
		1709	next_pri = pri + PRI_BIAS;
		1710	}
		1711	OUTPUT:
		1712	RETVAL
		1713
		1714	void
		1715	aioreq_nice (int nice = 0)
		1716	CODE:
		1717	nice = next_pri - nice;
		1718	if (nice < PRI_MIN) nice = PRI_MIN;
		1719	if (nice > PRI_MAX) nice = PRI_MAX;
		1720	next_pri = nice + PRI_BIAS;
		1721
		1722	void
744	flush()	1723	flush ()
745	PROTOTYPE:	1724	PROTOTYPE:
746	CODE:	1725	CODE:
747	while (nreqs)	1726	while (nreqs)
748	{	1727	{
749	poll_wait ();	1728	poll_wait ();
750	poll_cb ();	1729	poll_cb ();
751	}	1730	}
752		1731
753	void	1732	int
754	poll()	1733	poll()
755	PROTOTYPE:	1734	PROTOTYPE:
756	CODE:	1735	CODE:
757	if (nreqs)
758	{
759	poll_wait ();	1736	poll_wait ();
760	poll_cb ();	1737	RETVAL = poll_cb ();
761	}	1738	OUTPUT:
		1739	RETVAL
762		1740
763	int	1741	int
764	poll_fileno()	1742	poll_fileno()
765	PROTOTYPE:	1743	PROTOTYPE:
766	CODE:	1744	CODE:
…		…
778		1756
779	void	1757	void
780	poll_wait()	1758	poll_wait()
781	PROTOTYPE:	1759	PROTOTYPE:
782	CODE:	1760	CODE:
783	if (nreqs)
784	poll_wait ();	1761	poll_wait ();
		1762
		1763	void
		1764	setsig (int signum = SIGIO)
		1765	PROTOTYPE: ;$
		1766	CODE:
		1767	{
		1768	if (block_sig_level)
		1769	croak ("cannot call IO::AIO::setsig from within aio_block/callback");
		1770
		1771	LOCK (reslock);
		1772	main_tid = pthread_self ();
		1773	main_sig = signum;
		1774	UNLOCK (reslock);
		1775
		1776	if (main_sig && npending)
		1777	pthread_kill (main_tid, main_sig);
		1778	}
		1779
		1780	void
		1781	aio_block (SV *cb)
		1782	PROTOTYPE: &
		1783	PPCODE:
		1784	{
		1785	int count;
		1786
		1787	block_sig ();
		1788	PUSHMARK (SP);
		1789	PUTBACK;
		1790	count = call_sv (cb, GIMME_V | G_NOARGS | G_EVAL);
		1791	SPAGAIN;
		1792	unblock_sig ();
		1793
		1794	if (SvTRUE (ERRSV))
		1795	croak (0);
		1796
		1797	XSRETURN (count);
		1798	}
785		1799
786	int	1800	int
787	nreqs()	1801	nreqs()
788	PROTOTYPE:	1802	PROTOTYPE:
789	CODE:	1803	CODE:
790	RETVAL = nreqs;	1804	RETVAL = nreqs;
791	OUTPUT:	1805	OUTPUT:
792	RETVAL	1806	RETVAL
793		1807
		1808	int
		1809	nready()
		1810	PROTOTYPE:
		1811	CODE:
		1812	RETVAL = get_nready ();
		1813	OUTPUT:
		1814	RETVAL
		1815
		1816	int
		1817	npending()
		1818	PROTOTYPE:
		1819	CODE:
		1820	RETVAL = get_npending ();
		1821	OUTPUT:
		1822	RETVAL
		1823
		1824	int
		1825	nthreads()
		1826	PROTOTYPE:
		1827	CODE:
		1828	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1829	RETVAL = started;
		1830	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1831	OUTPUT:
		1832	RETVAL
		1833
		1834	PROTOTYPES: DISABLE
		1835
		1836	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1837
		1838	void
		1839	cancel (aio_req_ornot req)
		1840	CODE:
		1841	req_cancel (req);
		1842
		1843	void
		1844	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1845	CODE:
		1846	SvREFCNT_dec (req->callback);
		1847	req->callback = newSVsv (callback);
		1848
		1849	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1850
		1851	void
		1852	add (aio_req grp, ...)
		1853	PPCODE:
		1854	{
		1855	int i;
		1856	aio_req req;
		1857
		1858	if (main_sig && !block_sig_level)
		1859	croak ("aio_group->add called outside aio_block/callback context while IO::AIO::setsig is in use");
		1860
		1861	if (grp->int1 == 2)
		1862	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1863
		1864	for (i = 1; i < items; ++i )
		1865	{
		1866	if (GIMME_V != G_VOID)
		1867	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1868
		1869	req = SvAIO_REQ (ST (i));
		1870
		1871	if (req)
		1872	{
		1873	++grp->size;
		1874	req->grp = grp;
		1875
		1876	req->grp_prev = 0;
		1877	req->grp_next = grp->grp_first;
		1878
		1879	if (grp->grp_first)
		1880	grp->grp_first->grp_prev = req;
		1881
		1882	grp->grp_first = req;
		1883	}
		1884	}
		1885	}
		1886
		1887	void
		1888	cancel_subs (aio_req_ornot req)
		1889	CODE:
		1890	req_cancel_subs (req);
		1891
		1892	void
		1893	result (aio_req grp, ...)
		1894	CODE:
		1895	{
		1896	int i;
		1897	AV *av;
		1898
		1899	grp->errorno = errno;
		1900
		1901	av = newAV ();
		1902
		1903	for (i = 1; i < items; ++i )
		1904	av_push (av, newSVsv (ST (i)));
		1905
		1906	SvREFCNT_dec (grp->sv1);
		1907	grp->sv1 = (SV *)av;
		1908	}
		1909
		1910	void
		1911	errno (aio_req grp, int errorno = errno)
		1912	CODE:
		1913	grp->errorno = errorno;
		1914
		1915	void
		1916	limit (aio_req grp, int limit)
		1917	CODE:
		1918	grp->int2 = limit;
		1919	aio_grp_feed (grp);
		1920
		1921	void
		1922	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1923	CODE:
		1924	{
		1925	SvREFCNT_dec (grp->sv2);
		1926	grp->sv2 = newSVsv (callback);
		1927
		1928	if (grp->int2 <= 0)
		1929	grp->int2 = 2;
		1930
		1931	aio_grp_feed (grp);
		1932	}
		1933

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