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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.36 by root, Tue Aug 23 01:18:04 2005 UTC vs.
Revision 1.98 by root, Wed May 9 06:45:12 2007 UTC

1	#define _REENTRANT 1	1	#include "xthread.h"
		2
2	#include <errno.h>	3	#include <errno.h>
3		4
4	#include "EXTERN.h"	5	#include "EXTERN.h"
5	#include "perl.h"	6	#include "perl.h"
6	#include "XSUB.h"	7	#include "XSUB.h"
7		8
8	#include "autoconf/config.h"	9	#include "autoconf/config.h"
9		10
10	#include <pthread.h>	11	#include <stddef.h>
11		12	#include <stdlib.h>
		13	#include <errno.h>
		14	#include <sys/time.h>
		15	#include <sys/select.h>
12	#include <sys/types.h>	16	#include <sys/types.h>
13	#include <sys/stat.h>	17	#include <sys/stat.h>
14		18	#include <limits.h>
15	#include <unistd.h>	19	#include <unistd.h>
16	#include <fcntl.h>	20	#include <fcntl.h>
17	#include <signal.h>	21	#include <signal.h>
18	#include <sched.h>	22	#include <sched.h>
19		23
…		…
30	# else	34	# else
31	# error sendfile support requested but not available	35	# error sendfile support requested but not available
32	# endif	36	# endif
33	#endif	37	#endif
34		38
35	#if __ia64	39	/* number of seconds after which idle threads exit */
36	# define STACKSIZE 65536	40	#define IDLE_TIMEOUT 10
37	#else	41
38	# define STACKSIZE 4096	42	/* used for struct dirent, AIX doesn't provide it */
		43	#ifndef NAME_MAX
		44	# define NAME_MAX 4096
39	#endif	45	#endif
		46
		47	/* buffer size for various temporary buffers */
		48	#define AIO_BUFSIZE 65536
		49
		50	#define dBUF \
		51	char *aio_buf; \
		52	LOCK (wrklock); \
		53	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		54	UNLOCK (wrklock); \
		55	if (!aio_buf) \
		56	return -1;
		57
		58	typedef SV SV8; /* byte-sv, used for argument-checking */
40		59
41	enum {	60	enum {
42	REQ_QUIT,	61	REQ_QUIT,
43	REQ_OPEN, REQ_CLOSE,	62	REQ_OPEN, REQ_CLOSE,
44	REQ_READ, REQ_WRITE, REQ_READAHEAD,	63	REQ_READ, REQ_WRITE, REQ_READAHEAD,
45	REQ_SENDFILE,	64	REQ_SENDFILE,
46	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	65	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
47	REQ_FSYNC, REQ_FDATASYNC,	66	REQ_FSYNC, REQ_FDATASYNC,
48	REQ_UNLINK, REQ_RMDIR,	67	REQ_UNLINK, REQ_RMDIR, REQ_MKDIR, REQ_RENAME,
49	REQ_SYMLINK,	68	REQ_MKNOD, REQ_READDIR,
		69	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		70	REQ_GROUP, REQ_NOP,
		71	REQ_BUSY,
50	};	72	};
51		73
		74	#define AIO_REQ_KLASS "IO::AIO::REQ"
		75	#define AIO_GRP_KLASS "IO::AIO::GRP"
		76
52	typedef struct aio_cb {	77	typedef struct aio_cb
		78	{
53	struct aio_cb *volatile next;	79	struct aio_cb *volatile next;
54		80
		81	SV *callback, *fh;
		82	SV *sv1, *sv2;
		83	void *ptr1, *ptr2;
		84	off_t offs;
		85	size_t size;
		86	ssize_t result;
		87
		88	STRLEN stroffset;
55	int type;	89	int type;
56		90	int int1, int2;
57	int fd, fd2;	91	int errorno;
58	off_t offset;
59	size_t length;
60	ssize_t result;
61	mode_t mode; /* open */	92	mode_t mode; /* open */
62	int errorno;
63	SV *data, *callback;
64	SV *fh, *fh2;
65	void *dataptr, *data2ptr;
66	STRLEN dataoffset;
67		93
68	Stat_t *statdata;	94	unsigned char flags;
		95	unsigned char pri;
		96
		97	SV *self; /* the perl counterpart of this request, if any */
		98	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
69	} aio_cb;	99	} aio_cb;
70		100
		101	enum {
		102	FLAG_CANCELLED = 0x01, /* request was cancelled */
		103	FLAG_SV1_RO_OFF = 0x40, /* data was set readonly */
		104	FLAG_PTR2_FREE = 0x80, /* need to free(ptr2) */
		105	};
		106
71	typedef aio_cb *aio_req;	107	typedef aio_cb *aio_req;
		108	typedef aio_cb *aio_req_ornot;
72		109
		110	enum {
		111	PRI_MIN = -4,
		112	PRI_MAX = 4,
		113
		114	DEFAULT_PRI = 0,
		115	PRI_BIAS = -PRI_MIN,
		116	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		117	};
		118
		119	#define AIO_TICKS ((1000000 + 1023) >> 10)
		120
		121	static unsigned int max_poll_time = 0;
		122	static unsigned int max_poll_reqs = 0;
		123
		124	/* calculcate time difference in ~1/AIO_TICKS of a second */
		125	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		126	{
		127	return (tv2->tv_sec - tv1->tv_sec ) * AIO_TICKS
		128	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		129	}
		130
		131	static thread_t main_tid;
		132	static int main_sig;
		133	static int block_sig_level;
		134
		135	void block_sig ()
		136	{
		137	sigset_t ss;
		138
		139	if (block_sig_level++)
		140	return;
		141
		142	if (!main_sig)
		143	return;
		144
		145	sigemptyset (&ss);
		146	sigaddset (&ss, main_sig);
		147	pthread_sigmask (SIG_BLOCK, &ss, 0);
		148	}
		149
		150	void unblock_sig ()
		151	{
		152	sigset_t ss;
		153
		154	if (--block_sig_level)
		155	return;
		156
		157	if (!main_sig)
		158	return;
		159
		160	sigemptyset (&ss);
		161	sigaddset (&ss, main_sig);
		162	pthread_sigmask (SIG_UNBLOCK, &ss, 0);
		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	/* worker threads management */
		170	static mutex_t wrklock = MUTEX_INIT;
		171
		172	typedef struct worker {
		173	/* locked by wrklock */
		174	struct worker *prev, *next;
		175
		176	thread_t tid;
		177
		178	/* locked by reslock, reqlock or wrklock */
		179	aio_req req; /* currently processed request */
		180	void *dbuf;
		181	DIR *dirp;
		182	} worker;
		183
		184	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		185
		186	static void worker_clear (worker *wrk)
		187	{
		188	if (wrk->dirp)
		189	{
		190	closedir (wrk->dirp);
		191	wrk->dirp = 0;
		192	}
		193
		194	if (wrk->dbuf)
		195	{
		196	free (wrk->dbuf);
		197	wrk->dbuf = 0;
		198	}
		199	}
		200
		201	static void worker_free (worker *wrk)
		202	{
		203	wrk->next->prev = wrk->prev;
		204	wrk->prev->next = wrk->next;
		205
		206	free (wrk);
		207	}
		208
		209	static volatile unsigned int nreqs, nready, npending;
		210	static volatile unsigned int max_idle = 4;
		211	static volatile unsigned int max_outstanding = 0xffffffff;
76	static int respipe [2];	212	static int respipe [2];
77		213
78	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	214	static mutex_t reslock = MUTEX_INIT;
79	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	215	static mutex_t reqlock = MUTEX_INIT;
80	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	216	static cond_t reqwait = COND_INIT;
81		217
82	static volatile aio_req reqs, reqe; /* queue start, queue end */	218	#if WORDACCESS_UNSAFE
83	static volatile aio_req ress, rese; /* queue start, queue end */
84		219
85	static void free_req (aio_req req)	220	static unsigned int get_nready ()
86	{	221	{
87	if (req->data)	222	unsigned int retval;
88	SvREFCNT_dec (req->data);
89		223
90	if (req->fh)	224	LOCK (reqlock);
91	SvREFCNT_dec (req->fh);	225	retval = nready;
		226	UNLOCK (reqlock);
92		227
93	if (req->fh2)	228	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	}	229	}
104		230
105	static void	231	static unsigned int get_npending ()
106	poll_wait ()
107	{	232	{
108	if (nreqs && !ress)	233	unsigned int retval;
		234
		235	LOCK (reslock);
		236	retval = npending;
		237	UNLOCK (reslock);
		238
		239	return retval;
		240	}
		241
		242	static unsigned int get_nthreads ()
		243	{
		244	unsigned int retval;
		245
		246	LOCK (wrklock);
		247	retval = started;
		248	UNLOCK (wrklock);
		249
		250	return retval;
		251	}
		252
		253	#else
		254
		255	# define get_nready() nready
		256	# define get_npending() npending
		257	# define get_nthreads() started
		258
		259	#endif
		260
		261	/*
		262	* a somewhat faster data structure might be nice, but
		263	* with 8 priorities this actually needs <20 insns
		264	* per shift, the most expensive operation.
		265	*/
		266	typedef struct {
		267	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		268	int size;
		269	} reqq;
		270
		271	static reqq req_queue;
		272	static reqq res_queue;
		273
		274	int reqq_push (reqq *q, aio_req req)
		275	{
		276	int pri = req->pri;
		277	req->next = 0;
		278
		279	if (q->qe[pri])
109	{	280	{
110	fd_set rfd;	281	q->qe[pri]->next = req;
111	FD_ZERO(&rfd);	282	q->qe[pri] = req;
112	FD_SET(respipe [0], &rfd);
113
114	select (respipe [0] + 1, &rfd, 0, 0, 0);
115	}	283	}
116	}	284	else
		285	q->qe[pri] = q->qs[pri] = req;
117		286
118	static int	287	return q->size++;
119	poll_cb ()	288	}
120	{
121	dSP;
122	int count = 0;
123	int do_croak = 0;
124	aio_req req;
125		289
126	for (;;)	290	aio_req reqq_shift (reqq *q)
		291	{
		292	int pri;
		293
		294	if (!q->size)
		295	return 0;
		296
		297	--q->size;
		298
		299	for (pri = NUM_PRI; pri--; )
127	{	300	{
128	pthread_mutex_lock (&reslock);	301	aio_req req = q->qs[pri];
129	req = ress;
130		302
131	if (req)	303	if (req)
132	{	304	{
133	ress = req->next;	305	if (!(q->qs[pri] = req->next))
		306	q->qe[pri] = 0;
134		307
135	if (!ress)	308	return req;
		309	}
		310	}
		311
		312	abort ();
		313	}
		314
		315	static int poll_cb ();
		316	static int req_invoke (aio_req req);
		317	static void req_free (aio_req req);
		318	static void req_cancel (aio_req req);
		319
		320	/* must be called at most once */
		321	static SV *req_sv (aio_req req, const char *klass)
		322	{
		323	if (!req->self)
		324	{
		325	req->self = (SV *)newHV ();
		326	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		327	}
		328
		329	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		330	}
		331
		332	static aio_req SvAIO_REQ (SV *sv)
		333	{
		334	MAGIC *mg;
		335
		336	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		337	croak ("object of class " AIO_REQ_KLASS " expected");
		338
		339	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		340
		341	return mg ? (aio_req)mg->mg_ptr : 0;
		342	}
		343
		344	static void aio_grp_feed (aio_req grp)
		345	{
		346	block_sig ();
		347
		348	while (grp->size < grp->int2 && !(grp->flags & FLAG_CANCELLED))
		349	{
		350	int old_len = grp->size;
		351
		352	if (grp->sv2 && SvOK (grp->sv2))
		353	{
		354	dSP;
		355
		356	ENTER;
		357	SAVETMPS;
		358	PUSHMARK (SP);
		359	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		360	PUTBACK;
		361	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		362	SPAGAIN;
		363	FREETMPS;
		364	LEAVE;
		365	}
		366
		367	/* stop if no progress has been made */
		368	if (old_len == grp->size)
		369	{
		370	SvREFCNT_dec (grp->sv2);
		371	grp->sv2 = 0;
		372	break;
		373	}
		374	}
		375
		376	unblock_sig ();
		377	}
		378
		379	static void aio_grp_dec (aio_req grp)
		380	{
		381	--grp->size;
		382
		383	/* call feeder, if applicable */
		384	aio_grp_feed (grp);
		385
		386	/* finish, if done */
		387	if (!grp->size && grp->int1)
		388	{
		389	block_sig ();
		390
		391	if (!req_invoke (grp))
		392	{
		393	req_free (grp);
		394	unblock_sig ();
		395	croak (0);
		396	}
		397
		398	req_free (grp);
		399	unblock_sig ();
		400	}
		401	}
		402
		403	static int req_invoke (aio_req req)
		404	{
		405	dSP;
		406
		407	if (req->flags & FLAG_SV1_RO_OFF)
		408	SvREADONLY_off (req->sv1);
		409
		410	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		411	{
		412	ENTER;
		413	SAVETMPS;
		414	PUSHMARK (SP);
		415	EXTEND (SP, 1);
		416
		417	switch (req->type)
		418	{
		419	case REQ_READDIR:
136	{	420	{
137	/* read any signals sent by the worker threads */	421	SV *rv = &PL_sv_undef;
138	char buf [32];	422
139	while (read (respipe [0], buf, 32) == 32)	423	if (req->result >= 0)
140	;	424	{
		425	int i;
		426	char *buf = req->ptr2;
		427	AV *av = newAV ();
141		428
142	rese = 0;	429	av_extend (av, req->result - 1);
		430
		431	for (i = 0; i < req->result; ++i)
		432	{
		433	SV *sv = newSVpv (buf, 0);
		434
		435	av_store (av, i, sv);
		436	buf += SvCUR (sv) + 1;
		437	}
		438
		439	rv = sv_2mortal (newRV_noinc ((SV *)av));
		440	}
		441
		442	PUSHs (rv);
143	}	443	}
144	}
145
146	pthread_mutex_unlock (&reslock);
147
148	if (!req)
149	break;	444	break;
150		445
151	nreqs--;	446	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	{	447	{
179	/* convert fd to fh */	448	/* convert fd to fh */
180	SV *fh;	449	SV *fh;
181		450
		451	PUSHs (sv_2mortal (newSViv (req->result)));
182	PUTBACK;	452	PUTBACK;
183	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	453	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
184	SPAGAIN;	454	SPAGAIN;
185		455
186	fh = SvREFCNT_inc (POPs);	456	fh = POPs;
187
188	PUSHMARK (SP);	457	PUSHMARK (SP);
189	XPUSHs (sv_2mortal (fh));	458	XPUSHs (fh);
190	}	459	}
		460	break;
191		461
192	if (SvOK (req->callback))	462	case REQ_GROUP:
		463	req->int1 = 2; /* mark group as finished */
		464
		465	if (req->sv1)
		466	{
		467	int i;
		468	AV *av = (AV *)req->sv1;
		469
		470	EXTEND (SP, AvFILL (av) + 1);
		471	for (i = 0; i <= AvFILL (av); ++i)
		472	PUSHs (*av_fetch (av, i, 0));
		473	}
		474	break;
		475
		476	case REQ_NOP:
		477	case REQ_BUSY:
		478	break;
		479
		480	case REQ_READLINK:
		481	if (req->result > 0)
		482	{
		483	SvCUR_set (req->sv1, req->result);
		484	*SvEND (req->sv1) = 0;
		485	PUSHs (req->sv1);
		486	}
		487	break;
		488
		489	case REQ_STAT:
		490	case REQ_LSTAT:
		491	case REQ_FSTAT:
		492	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		493	PL_laststatval = req->result;
		494	PL_statcache = *(Stat_t *)(req->ptr2);
		495	PUSHs (sv_2mortal (newSViv (req->result)));
		496	break;
		497
		498	case REQ_READ:
		499	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		500	*SvEND (req->sv1) = 0;
		501	PUSHs (sv_2mortal (newSViv (req->result)));
		502	break;
		503
		504	default:
		505	PUSHs (sv_2mortal (newSViv (req->result)));
		506	break;
		507	}
		508
		509	errno = req->errorno;
		510
		511	PUTBACK;
		512	call_sv (req->callback, G_VOID | G_EVAL);
		513	SPAGAIN;
		514
		515	FREETMPS;
		516	LEAVE;
		517	}
		518
		519	if (req->grp)
		520	{
		521	aio_req grp = req->grp;
		522
		523	/* unlink request */
		524	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		525	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		526
		527	if (grp->grp_first == req)
		528	grp->grp_first = req->grp_next;
		529
		530	aio_grp_dec (grp);
		531	}
		532
		533	return !SvTRUE (ERRSV);
		534	}
		535
		536	static void req_free (aio_req req)
		537	{
		538	if (req->self)
		539	{
		540	sv_unmagic (req->self, PERL_MAGIC_ext);
		541	SvREFCNT_dec (req->self);
		542	}
		543
		544	SvREFCNT_dec (req->fh);
		545	SvREFCNT_dec (req->sv1);
		546	SvREFCNT_dec (req->sv2);
		547	SvREFCNT_dec (req->callback);
		548
		549	if (req->flags & FLAG_PTR2_FREE)
		550	free (req->ptr2);
		551
		552	Safefree (req);
		553	}
		554
		555	static void req_cancel_subs (aio_req grp)
		556	{
		557	aio_req sub;
		558
		559	if (grp->type != REQ_GROUP)
		560	return;
		561
		562	SvREFCNT_dec (grp->sv2);
		563	grp->sv2 = 0;
		564
		565	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		566	req_cancel (sub);
		567	}
		568
		569	static void req_cancel (aio_req req)
		570	{
		571	req->flags |= FLAG_CANCELLED;
		572
		573	req_cancel_subs (req);
		574	}
		575
		576	static void *aio_proc(void *arg);
		577
		578	static void start_thread (void)
		579	{
		580	worker *wrk = calloc (1, sizeof (worker));
		581
		582	if (!wrk)
		583	croak ("unable to allocate worker thread data");
		584
		585	LOCK (wrklock);
		586
		587	if (thread_create (&wrk->tid, aio_proc, (void *)wrk))
		588	{
		589	wrk->prev = &wrk_first;
		590	wrk->next = wrk_first.next;
		591	wrk_first.next->prev = wrk;
		592	wrk_first.next = wrk;
		593	++started;
		594	}
		595	else
		596	free (wrk);
		597
		598	UNLOCK (wrklock);
		599	}
		600
		601	static void maybe_start_thread ()
		602	{
		603	if (get_nthreads () >= wanted)
		604	return;
		605
		606	/* todo: maybe use idle here, but might be less exact */
		607	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		608	return;
		609
		610	start_thread ();
		611	}
		612
		613	static void req_send (aio_req req)
		614	{
		615	block_sig ();
		616
		617	++nreqs;
		618
		619	LOCK (reqlock);
		620	++nready;
		621	reqq_push (&req_queue, req);
		622	COND_SIGNAL (reqwait);
		623	UNLOCK (reqlock);
		624
		625	unblock_sig ();
		626
		627	maybe_start_thread ();
		628	}
		629
		630	static void end_thread (void)
		631	{
		632	aio_req req;
		633
		634	Newz (0, req, 1, aio_cb);
		635
		636	req->type = REQ_QUIT;
		637	req->pri = PRI_MAX + PRI_BIAS;
		638
		639	LOCK (reqlock);
		640	reqq_push (&req_queue, req);
		641	COND_SIGNAL (reqwait);
		642	UNLOCK (reqlock);
		643
		644	LOCK (wrklock);
		645	--started;
		646	UNLOCK (wrklock);
		647	}
		648
		649	static void set_max_idle (int nthreads)
		650	{
		651	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		652	max_idle = nthreads <= 0 ? 1 : nthreads;
		653	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
		654	}
		655
		656	static void min_parallel (int nthreads)
		657	{
		658	if (wanted < nthreads)
		659	wanted = nthreads;
		660	}
		661
		662	static void max_parallel (int nthreads)
		663	{
		664	if (wanted > nthreads)
		665	wanted = nthreads;
		666
		667	while (started > wanted)
		668	end_thread ();
		669	}
		670
		671	static void poll_wait ()
		672	{
		673	fd_set rfd;
		674
		675	while (nreqs)
		676	{
		677	int size;
		678	if (WORDACCESS_UNSAFE) LOCK (reslock);
		679	size = res_queue.size;
		680	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		681
		682	if (size)
		683	return;
		684
		685	maybe_start_thread ();
		686
		687	FD_ZERO(&rfd);
		688	FD_SET(respipe [0], &rfd);
		689
		690	select (respipe [0] + 1, &rfd, 0, 0, 0);
		691	}
		692	}
		693
		694	static int poll_cb ()
		695	{
		696	dSP;
		697	int count = 0;
		698	int maxreqs = max_poll_reqs;
		699	int do_croak = 0;
		700	struct timeval tv_start, tv_now;
		701	aio_req req;
		702
		703	if (max_poll_time)
		704	gettimeofday (&tv_start, 0);
		705
		706	block_sig ();
		707
		708	for (;;)
		709	{
		710	for (;;)
		711	{
		712	maybe_start_thread ();
		713
		714	LOCK (reslock);
		715	req = reqq_shift (&res_queue);
		716
		717	if (req)
193	{	718	{
194	PUTBACK;	719	--npending;
195	call_sv (req->callback, G_VOID | G_EVAL);
196	SPAGAIN;
197		720
198	if (SvTRUE (ERRSV))	721	if (!res_queue.size)
199	{	722	{
		723	/* read any signals sent by the worker threads */
		724	char buf [4];
		725	while (read (respipe [0], buf, 4) == 4)
		726	;
		727	}
		728	}
		729
		730	UNLOCK (reslock);
		731
		732	if (!req)
		733	break;
		734
		735	--nreqs;
		736
		737	if (req->type == REQ_GROUP && req->size)
		738	{
		739	req->int1 = 1; /* mark request as delayed */
		740	continue;
		741	}
		742	else
		743	{
		744	if (!req_invoke (req))
		745	{
200	free_req (req);	746	req_free (req);
		747	unblock_sig ();
201	croak (0);	748	croak (0);
202	}	749	}
		750
		751	count++;
203	}	752	}
204		753
205	LEAVE;	754	req_free (req);
206		755
207	errno = errorno;	756	if (maxreqs && !--maxreqs)
208	count++;	757	break;
		758
		759	if (max_poll_time)
		760	{
		761	gettimeofday (&tv_now, 0);
		762
		763	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
		764	break;
		765	}
209	}	766	}
210		767
211	free_req (req);	768	if (nreqs <= max_outstanding)
		769	break;
		770
		771	poll_wait ();
		772
		773	++maxreqs;
212	}	774	}
213		775
		776	unblock_sig ();
214	return count;	777	return count;
215	}
216
217	static void *aio_proc(void *arg);
218
219	static void
220	start_thread (void)
221	{
222	sigset_t fullsigset, oldsigset;
223	pthread_t tid;
224	pthread_attr_t attr;
225
226	pthread_attr_init (&attr);
227	pthread_attr_setstacksize (&attr, STACKSIZE);
228	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
229
230	sigfillset (&fullsigset);
231	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
232
233	if (pthread_create (&tid, &attr, aio_proc, 0) == 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	{
253	reqe->next = req;
254	reqe = req;
255	}
256	else
257	reqe = reqs = req;
258
259	pthread_cond_signal (&reqwait);
260	pthread_mutex_unlock (&reqlock);
261
262	if (nreqs > max_outstanding)
263	for (;;)
264	{
265	poll_cb ();
266
267	if (nreqs <= max_outstanding)
268	break;
269
270	poll_wait ();
271	}
272	}
273
274	static void
275	end_thread (void)
276	{
277	aio_req req;
278	Newz (0, req, 1, aio_cb);
279	req->type = REQ_QUIT;
280
281	send_req (req);
282	}
283
284	static void min_parallel (int nthreads)
285	{
286	if (wanted < nthreads)
287	wanted = nthreads;
288	}
289
290	static void max_parallel (int nthreads)
291	{
292	int cur = started;
293
294	if (wanted > nthreads)
295	wanted = nthreads;
296
297	while (cur > wanted)
298	{
299	end_thread ();
300	cur--;
301	}
302
303	while (started > wanted)
304	{
305	poll_wait ();
306	poll_cb ();
307	}
308	}	778	}
309		779
310	static void create_pipe ()	780	static void create_pipe ()
311	{	781	{
312	if (pipe (respipe))	782	if (pipe (respipe))
…		…
315	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	785	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
316	croak ("cannot set result pipe to nonblocking mode");	786	croak ("cannot set result pipe to nonblocking mode");
317		787
318	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	788	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
319	croak ("cannot set result pipe to nonblocking mode");	789	croak ("cannot set result pipe to nonblocking mode");
320	}
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	}	790	}
364		791
365	/*****************************************************************************/	792	/*****************************************************************************/
366	/* work around various missing functions */	793	/* work around various missing functions */
367		794
…		…
372	/*	799	/*
373	* make our pread/pwrite safe against themselves, but not against	800	* make our pread/pwrite safe against themselves, but not against
374	* normal read/write by using a mutex. slows down execution a lot,	801	* normal read/write by using a mutex. slows down execution a lot,
375	* but that's your problem, not mine.	802	* but that's your problem, not mine.
376	*/	803	*/
377	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	804	static mutex_t preadwritelock = MUTEX_INIT;
378		805
379	static ssize_t	806	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
380	pread (int fd, void *buf, size_t count, off_t offset)
381	{	807	{
382	ssize_t res;	808	ssize_t res;
383	off_t ooffset;	809	off_t ooffset;
384		810
385	pthread_mutex_lock (&iolock);	811	LOCK (preadwritelock);
386	ooffset = lseek (fd, 0, SEEK_CUR);	812	ooffset = lseek (fd, 0, SEEK_CUR);
387	lseek (fd, offset, SEEK_SET);	813	lseek (fd, offset, SEEK_SET);
388	res = read (fd, buf, count);	814	res = read (fd, buf, count);
389	lseek (fd, ooffset, SEEK_SET);	815	lseek (fd, ooffset, SEEK_SET);
390	pthread_mutex_unlock (&iolock);	816	UNLOCK (preadwritelock);
391		817
392	return res;	818	return res;
393	}	819	}
394		820
395	static ssize_t
396	pwrite (int fd, void *buf, size_t count, off_t offset)	821	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
397	{	822	{
398	ssize_t res;	823	ssize_t res;
399	off_t ooffset;	824	off_t ooffset;
400		825
401	pthread_mutex_lock (&iolock);	826	LOCK (preadwritelock);
402	ooffset = lseek (fd, 0, SEEK_CUR);	827	ooffset = lseek (fd, 0, SEEK_CUR);
403	lseek (fd, offset, SEEK_SET);	828	lseek (fd, offset, SEEK_SET);
404	res = write (fd, buf, count);	829	res = write (fd, buf, count);
405	lseek (fd, offset, SEEK_SET);	830	lseek (fd, offset, SEEK_SET);
406	pthread_mutex_unlock (&iolock);	831	UNLOCK (preadwritelock);
407		832
408	return res;	833	return res;
409	}	834	}
410	#endif	835	#endif
411		836
412	#if !HAVE_FDATASYNC	837	#if !HAVE_FDATASYNC
413	# define fdatasync fsync	838	# define fdatasync fsync
414	#endif	839	#endif
415		840
416	#if !HAVE_READAHEAD	841	#if !HAVE_READAHEAD
417	# define readahead aio_readahead	842	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
418		843
419	static char readahead_buf[4096];	844	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
420
421	static ssize_t
422	readahead (int fd, off_t offset, size_t count)
423	{	845	{
		846	dBUF;
		847
424	while (count > 0)	848	while (count > 0)
425	{	849	{
426	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	850	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
427		851
428	pread (fd, readahead_buf, len, offset);	852	pread (fd, aio_buf, len, offset);
429	offset += len;	853	offset += len;
430	count -= len;	854	count -= len;
431	}	855	}
432		856
433	errno = 0;	857	errno = 0;
434	}	858	}
		859
435	#endif	860	#endif
436		861
		862	#if !HAVE_READDIR_R
		863	# define readdir_r aio_readdir_r
		864
		865	static mutex_t readdirlock = MUTEX_INIT;
		866
		867	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		868	{
		869	struct dirent *e;
		870	int errorno;
		871
		872	LOCK (readdirlock);
		873
		874	e = readdir (dirp);
		875	errorno = errno;
		876
		877	if (e)
		878	{
		879	*res = ent;
		880	strcpy (ent->d_name, e->d_name);
		881	}
		882	else
		883	*res = 0;
		884
		885	UNLOCK (readdirlock);
		886
		887	errno = errorno;
		888	return e ? 0 : -1;
		889	}
		890	#endif
		891
437	/* sendfile always needs emulation */	892	/* sendfile always needs emulation */
438	static ssize_t
439	sendfile_ (int ofd, int ifd, off_t offset, size_t count)	893	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
440	{	894	{
441	ssize_t res;	895	ssize_t res;
442		896
443	if (!count)	897	if (!count)
444	return 0;	898	return 0;
445		899
446	#if HAVE_SENDFILE	900	#if HAVE_SENDFILE
447	# if __linux	901	# if __linux
448	res = sendfile (ofd, ifd, &offset, count);	902	res = sendfile (ofd, ifd, &offset, count);
449		903
450	# elif __freebsd	904	# elif __freebsd
451	/*	905	/*
452	* Of course, the freebsd sendfile is a dire hack with no thoughts	906	* Of course, the freebsd sendfile is a dire hack with no thoughts
453	* wasted on making it similar to other I/O functions.	907	* wasted on making it similar to other I/O functions.
454	*/	908	*/
455	{	909	{
456	off_t sbytes;	910	off_t sbytes;
457	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	911	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
458		912
459	if (res < 0 && sbytes)	913	if (res < 0 && sbytes)
460	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	914	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
461	res = sbytes;	915	res = sbytes;
462	}	916	}
463		917
464	# elif __hpux	918	# elif __hpux
465	res = sendfile (ofd, ifd, offset, count, 0, 0);	919	res = sendfile (ofd, ifd, offset, count, 0, 0);
466		920
467	# elif __solaris	921	# elif __solaris
468	{	922	{
469	struct sendfilevec vec;	923	struct sendfilevec vec;
470	size_t sbytes;	924	size_t sbytes;
471		925
472	vec.sfv_fd = ifd;	926	vec.sfv_fd = ifd;
473	vec.sfv_flag = 0;	927	vec.sfv_flag = 0;
474	vec.sfv_off = offset;	928	vec.sfv_off = offset;
475	vec.sfv_len = count;	929	vec.sfv_len = count;
476		930
477	res = sendfilev (ofd, &vec, 1, &sbytes);	931	res = sendfilev (ofd, &vec, 1, &sbytes);
478		932
479	if (res < 0 && sbytes)	933	if (res < 0 && sbytes)
480	res = sbytes;	934	res = sbytes;
481	}	935	}
482		936
483	# else
484	res = -1;
485	errno = ENOSYS;
486	# endif	937	# endif
		938	#else
		939	res = -1;
		940	errno = ENOSYS;
487	#endif	941	#endif
488		942
489	if (res < 0	943	if (res < 0
490	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK	944	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
491	#if __solaris	945	#if __solaris
492	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE	946	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
493	#endif	947	#endif
494	)	948	)
495	)	949	)
496	{	950	{
497	/* emulate sendfile. this is a major pain in the ass */	951	/* emulate sendfile. this is a major pain in the ass */
498	char *buf = malloc (4096);	952	dBUF;
		953
499	res = 0;	954	res = 0;
500		955
501	for (;;)	956	while (count)
502	{	957	{
503	ssize_t cnt;	958	ssize_t cnt;
504		959
505	cnt = pread (ifd, buf, 4096, offset);	960	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
506		961
507	if (cnt <= 0)	962	if (cnt <= 0)
508	{	963	{
509	if (cnt && !res) res = -1;	964	if (cnt && !res) res = -1;
510	break;	965	break;
511	}	966	}
512		967
513	cnt = write (ofd, buf, cnt);	968	cnt = write (ofd, aio_buf, cnt);
514		969
515	if (cnt <= 0)	970	if (cnt <= 0)
516	{	971	{
517	if (cnt && !res) res = -1;	972	if (cnt && !res) res = -1;
518	break;	973	break;
519	}	974	}
520		975
521	offset += cnt;	976	offset += cnt;
522	res += cnt;	977	res += cnt;
		978	count -= cnt;
523	}	979	}
524
525	{
526	int errorno = errno;
527	free (buf);
528	errno = errorno;
529	}
530	}	980	}
531		981
532	return res;	982	return res;
		983	}
		984
		985	/* read a full directory */
		986	static void scandir_ (aio_req req, worker *self)
		987	{
		988	DIR *dirp;
		989	union
		990	{
		991	struct dirent d;
		992	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		993	} *u;
		994	struct dirent *entp;
		995	char *name, *names;
		996	int memlen = 4096;
		997	int memofs = 0;
		998	int res = 0;
		999	int errorno;
		1000
		1001	LOCK (wrklock);
		1002	self->dirp = dirp = opendir (req->ptr1);
		1003	self->dbuf = u = malloc (sizeof (*u));
		1004	req->flags |= FLAG_PTR2_FREE;
		1005	req->ptr2 = names = malloc (memlen);
		1006	UNLOCK (wrklock);
		1007
		1008	if (dirp && u && names)
		1009	for (;;)
		1010	{
		1011	errno = 0;
		1012	readdir_r (dirp, &u->d, &entp);
		1013
		1014	if (!entp)
		1015	break;
		1016
		1017	name = entp->d_name;
		1018
		1019	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1020	{
		1021	int len = strlen (name) + 1;
		1022
		1023	res++;
		1024
		1025	while (memofs + len > memlen)
		1026	{
		1027	memlen *= 2;
		1028	LOCK (wrklock);
		1029	req->ptr2 = names = realloc (names, memlen);
		1030	UNLOCK (wrklock);
		1031
		1032	if (!names)
		1033	break;
		1034	}
		1035
		1036	memcpy (names + memofs, name, len);
		1037	memofs += len;
		1038	}
		1039	}
		1040
		1041	if (errno)
		1042	res = -1;
		1043
		1044	req->result = res;
533	}	1045	}
534		1046
535	/*****************************************************************************/	1047	/*****************************************************************************/
536		1048
537	static void *
538	aio_proc (void *thr_arg)	1049	static void *aio_proc (void *thr_arg)
539	{	1050	{
540	aio_req req;	1051	aio_req req;
541	int type;	1052	struct timespec ts;
		1053	worker *self = (worker *)thr_arg;
542		1054
543	do	1055	/* try to distribute timeouts somewhat evenly */
		1056	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1057	* (1000000000UL / 1024UL);
		1058
		1059	for (;;)
544	{	1060	{
545	pthread_mutex_lock (&reqlock);	1061	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1062
		1063	LOCK (reqlock);
546		1064
547	for (;;)	1065	for (;;)
548	{	1066	{
549	req = reqs;	1067	self->req = req = reqq_shift (&req_queue);
550
551	if (reqs)
552	{
553	reqs = reqs->next;
554	if (!reqs) reqe = 0;
555	}
556		1068
557	if (req)	1069	if (req)
558	break;	1070	break;
559		1071
560	pthread_cond_wait (&reqwait, &reqlock);	1072	++idle;
		1073
		1074	if (COND_TIMEDWAIT (reqwait, reqlock, ts)
		1075	== ETIMEDOUT)
		1076	{
		1077	if (idle > max_idle)
		1078	{
		1079	--idle;
		1080	UNLOCK (reqlock);
		1081	LOCK (wrklock);
		1082	--started;
		1083	UNLOCK (wrklock);
		1084	goto quit;
		1085	}
		1086
		1087	/* we are allowed to idle, so do so without any timeout */
		1088	COND_WAIT (reqwait, reqlock);
		1089	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1090	}
		1091
		1092	--idle;
561	}	1093	}
562		1094
563	pthread_mutex_unlock (&reqlock);	1095	--nready;
		1096
		1097	UNLOCK (reqlock);
564		1098
565	errno = 0; /* strictly unnecessary */	1099	errno = 0; /* strictly unnecessary */
566		1100
567	type = req->type;	1101	if (!(req->flags & FLAG_CANCELLED))
568
569	switch (type)	1102	switch (req->type)
		1103	{
		1104	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
		1105	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
		1106
		1107	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
		1108	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
		1109
		1110	case REQ_STAT: req->result = stat (req->ptr1, (Stat_t *)req->ptr2); break;
		1111	case REQ_LSTAT: req->result = lstat (req->ptr1, (Stat_t *)req->ptr2); break;
		1112	case REQ_FSTAT: req->result = fstat (req->int1, (Stat_t *)req->ptr2); break;
		1113
		1114	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
		1115	case REQ_CLOSE: req->result = close (req->int1); break;
		1116	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
		1117	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
		1118	case REQ_MKDIR: req->result = mkdir (req->ptr1, req->mode); break;
		1119	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
		1120	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
		1121	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1122	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1123	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
		1124
		1125	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
		1126	case REQ_FSYNC: req->result = fsync (req->int1); break;
		1127	case REQ_READDIR: scandir_ (req, self); break;
		1128
		1129	case REQ_BUSY:
		1130	{
		1131	struct timeval tv;
		1132
		1133	tv.tv_sec = req->int1;
		1134	tv.tv_usec = req->int2;
		1135
		1136	req->result = select (0, 0, 0, 0, &tv);
		1137	}
		1138
		1139	case REQ_GROUP:
		1140	case REQ_NOP:
		1141	break;
		1142
		1143	case REQ_QUIT:
		1144	goto quit;
		1145
		1146	default:
		1147	req->result = ENOSYS;
		1148	break;
		1149	}
		1150
		1151	req->errorno = errno;
		1152
		1153	LOCK (reslock);
		1154
		1155	++npending;
		1156
		1157	if (!reqq_push (&res_queue, req))
570	{	1158	{
571	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
572	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
573
574	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
575	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
576
577	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
578	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
579	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
580
581	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
582	case REQ_CLOSE: req->result = close (req->fd); break;
583	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
584	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
585	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
586
587	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
588	case REQ_FSYNC: req->result = fsync (req->fd); break;
589
590	case REQ_QUIT:
591	break;
592
593	default:
594	req->result = ENOSYS;
595	break;
596	}
597
598	req->errorno = errno;
599
600	pthread_mutex_lock (&reslock);
601
602	req->next = 0;
603
604	if (rese)
605	{
606	rese->next = req;
607	rese = req;
608	}
609	else
610	{
611	rese = ress = req;
612
613	/* write a dummy byte to the pipe so fh becomes ready */	1159	/* write a dummy byte to the pipe so fh becomes ready */
614	write (respipe [1], &respipe, 1);	1160	write (respipe [1], &respipe, 1);
		1161
		1162	/* optionally signal the main thread asynchronously */
		1163	if (main_sig)
		1164	pthread_kill (main_tid, main_sig);
615	}	1165	}
616		1166
617	pthread_mutex_unlock (&reslock);	1167	self->req = 0;
		1168	worker_clear (self);
		1169
		1170	UNLOCK (reslock);
618	}	1171	}
619	while (type != REQ_QUIT);	1172
		1173	quit:
		1174	LOCK (wrklock);
		1175	worker_free (self);
		1176	UNLOCK (wrklock);
620		1177
621	return 0;	1178	return 0;
		1179	}
		1180
		1181	/*****************************************************************************/
		1182
		1183	static void atfork_prepare (void)
		1184	{
		1185	LOCK (wrklock);
		1186	LOCK (reqlock);
		1187	LOCK (reslock);
		1188	#if !HAVE_PREADWRITE
		1189	LOCK (preadwritelock);
		1190	#endif
		1191	#if !HAVE_READDIR_R
		1192	LOCK (readdirlock);
		1193	#endif
		1194	}
		1195
		1196	static void atfork_parent (void)
		1197	{
		1198	#if !HAVE_READDIR_R
		1199	UNLOCK (readdirlock);
		1200	#endif
		1201	#if !HAVE_PREADWRITE
		1202	UNLOCK (preadwritelock);
		1203	#endif
		1204	UNLOCK (reslock);
		1205	UNLOCK (reqlock);
		1206	UNLOCK (wrklock);
		1207	}
		1208
		1209	static void atfork_child (void)
		1210	{
		1211	aio_req prv;
		1212
		1213	while (prv = reqq_shift (&req_queue))
		1214	req_free (prv);
		1215
		1216	while (prv = reqq_shift (&res_queue))
		1217	req_free (prv);
		1218
		1219	while (wrk_first.next != &wrk_first)
		1220	{
		1221	worker *wrk = wrk_first.next;
		1222
		1223	if (wrk->req)
		1224	req_free (wrk->req);
		1225
		1226	worker_clear (wrk);
		1227	worker_free (wrk);
		1228	}
		1229
		1230	started = 0;
		1231	idle = 0;
		1232	nreqs = 0;
		1233	nready = 0;
		1234	npending = 0;
		1235
		1236	close (respipe [0]);
		1237	close (respipe [1]);
		1238	create_pipe ();
		1239
		1240	atfork_parent ();
622	}	1241	}
623		1242
624	#define dREQ \	1243	#define dREQ \
625	aio_req req; \	1244	aio_req req; \
		1245	int req_pri = next_pri; \
		1246	next_pri = DEFAULT_PRI + PRI_BIAS; \
626	\	1247	\
627	if (SvOK (callback) && !SvROK (callback)) \	1248	if (SvOK (callback) && !SvROK (callback)) \
628	croak ("clalback must be undef or of reference type"); \	1249	croak ("callback must be undef or of reference type"); \
629	\	1250	\
630	Newz (0, req, 1, aio_cb); \	1251	Newz (0, req, 1, aio_cb); \
631	if (!req) \	1252	if (!req) \
632	croak ("out of memory during aio_req allocation"); \	1253	croak ("out of memory during aio_req allocation"); \
633	\	1254	\
634	req->callback = newSVsv (callback);	1255	req->callback = newSVsv (callback); \
		1256	req->pri = req_pri
		1257
		1258	#define REQ_SEND \
		1259	req_send (req); \
		1260	\
		1261	if (GIMME_V != G_VOID) \
		1262	XPUSHs (req_sv (req, AIO_REQ_KLASS));
635		1263
636	MODULE = IO::AIO PACKAGE = IO::AIO	1264	MODULE = IO::AIO PACKAGE = IO::AIO
637		1265
638	PROTOTYPES: ENABLE	1266	PROTOTYPES: ENABLE
639		1267
640	BOOT:	1268	BOOT:
641	{	1269	{
		1270	HV *stash = gv_stashpv ("IO::AIO", 1);
		1271
		1272	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		1273	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1274	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1275	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1276	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1277	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		1278	newCONSTSUB (stash, "SIGIO", newSViv (SIGIO));
		1279
642	create_pipe ();	1280	create_pipe ();
643	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1281	ATFORK (atfork_prepare, atfork_parent, atfork_child);
644	}	1282	}
645		1283
646	void	1284	void
647	min_parallel(nthreads)	1285	max_poll_reqs (int nreqs)
648	int nthreads
649	PROTOTYPE: $	1286	PROTOTYPE: $
		1287	CODE:
		1288	max_poll_reqs = nreqs;
650		1289
651	void	1290	void
652	max_parallel(nthreads)	1291	max_poll_time (double nseconds)
653	int nthreads
654	PROTOTYPE: $	1292	PROTOTYPE: $
		1293	CODE:
		1294	max_poll_time = nseconds * AIO_TICKS;
		1295
		1296	void
		1297	min_parallel (int nthreads)
		1298	PROTOTYPE: $
		1299
		1300	void
		1301	max_parallel (int nthreads)
		1302	PROTOTYPE: $
		1303
		1304	void
		1305	max_idle (int nthreads)
		1306	PROTOTYPE: $
		1307	CODE:
		1308	set_max_idle (nthreads);
655		1309
656	int	1310	int
657	max_outstanding(nreqs)	1311	max_outstanding (int maxreqs)
658	int nreqs	1312	PROTOTYPE: $
659	PROTOTYPE: $
660	CODE:	1313	CODE:
661	RETVAL = max_outstanding;	1314	RETVAL = max_outstanding;
662	max_outstanding = nreqs;	1315	max_outstanding = maxreqs;
		1316	OUTPUT:
		1317	RETVAL
663		1318
664	void	1319	void
665	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1320	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
666	SV * pathname	1321	SV8 * pathname
667	int flags	1322	int flags
668	int mode	1323	int mode
669	SV * callback	1324	SV * callback
670	PROTOTYPE: $$$;$	1325	PROTOTYPE: $$$;$
671	CODE:	1326	PPCODE:
672	{	1327	{
673	dREQ;	1328	dREQ;
674		1329
675	req->type = REQ_OPEN;	1330	req->type = REQ_OPEN;
676	req->data = newSVsv (pathname);	1331	req->sv1 = newSVsv (pathname);
677	req->dataptr = SvPVbyte_nolen (req->data);	1332	req->ptr1 = SvPVbyte_nolen (req->sv1);
678	req->fd = flags;	1333	req->int1 = flags;
679	req->mode = mode;	1334	req->mode = mode;
680		1335
681	send_req (req);	1336	REQ_SEND;
682	}	1337	}
683		1338
684	void	1339	void
685	aio_close(fh,callback=&PL_sv_undef)	1340	aio_close (fh,callback=&PL_sv_undef)
686	SV * fh	1341	SV * fh
687	SV * callback	1342	SV * callback
688	PROTOTYPE: $;$	1343	PROTOTYPE: $;$
689	ALIAS:	1344	ALIAS:
690	aio_close = REQ_CLOSE	1345	aio_close = REQ_CLOSE
691	aio_fsync = REQ_FSYNC	1346	aio_fsync = REQ_FSYNC
692	aio_fdatasync = REQ_FDATASYNC	1347	aio_fdatasync = REQ_FDATASYNC
693	CODE:	1348	PPCODE:
694	{	1349	{
695	dREQ;	1350	dREQ;
696		1351
697	req->type = ix;	1352	req->type = ix;
698	req->fh = newSVsv (fh);	1353	req->fh = newSVsv (fh);
699	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1354	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
700		1355
701	send_req (req);	1356	REQ_SEND (req);
702	}	1357	}
703		1358
704	void	1359	void
705	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1360	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
706	SV * fh	1361	SV * fh
707	UV offset	1362	UV offset
708	UV length	1363	UV length
709	SV * data	1364	SV8 * data
710	UV dataoffset	1365	UV dataoffset
711	SV * callback	1366	SV * callback
712	ALIAS:	1367	ALIAS:
713	aio_read = REQ_READ	1368	aio_read = REQ_READ
714	aio_write = REQ_WRITE	1369	aio_write = REQ_WRITE
715	PROTOTYPE: $$$$$;$	1370	PROTOTYPE: $$$$$;$
716	CODE:	1371	PPCODE:
717	{	1372	{
718	aio_req req;
719	STRLEN svlen;	1373	STRLEN svlen;
720	char *svptr = SvPVbyte (data, svlen);	1374	char *svptr = SvPVbyte (data, svlen);
721		1375
722	SvUPGRADE (data, SVt_PV);	1376	SvUPGRADE (data, SVt_PV);
723	SvPOK_on (data);	1377	SvPOK_on (data);
…		…
735	length = svlen - dataoffset;	1389	length = svlen - dataoffset;
736	}	1390	}
737	else	1391	else
738	{	1392	{
739	/* read: grow scalar as necessary */	1393	/* read: grow scalar as necessary */
740	svptr = SvGROW (data, length + dataoffset);	1394	svptr = SvGROW (data, length + dataoffset + 1);
741	}	1395	}
742		1396
743	if (length < 0)	1397	if (length < 0)
744	croak ("length must not be negative");	1398	croak ("length must not be negative");
745		1399
746	{	1400	{
747	dREQ;	1401	dREQ;
748		1402
749	req->type = ix;	1403	req->type = ix;
750	req->fh = newSVsv (fh);	1404	req->fh = newSVsv (fh);
751	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1405	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
752	: IoOFP (sv_2io (fh)));	1406	: IoOFP (sv_2io (fh)));
753	req->offset = offset;	1407	req->offs = offset;
754	req->length = length;	1408	req->size = length;
755	req->data = SvREFCNT_inc (data);	1409	req->sv1 = SvREFCNT_inc (data);
756	req->dataptr = (char *)svptr + dataoffset;	1410	req->ptr1 = (char *)svptr + dataoffset;
		1411	req->stroffset = dataoffset;
757		1412
758	if (!SvREADONLY (data))	1413	if (!SvREADONLY (data))
759	{	1414	{
760	SvREADONLY_on (data);	1415	SvREADONLY_on (data);
761	req->data2ptr = (void *)data;	1416	req->flags |= FLAG_SV1_RO_OFF;
762	}	1417	}
763		1418
764	send_req (req);	1419	REQ_SEND;
765	}	1420	}
766	}	1421	}
767		1422
768	void	1423	void
		1424	aio_readlink (path,callback=&PL_sv_undef)
		1425	SV8 * path
		1426	SV * callback
		1427	PROTOTYPE: $$;$
		1428	PPCODE:
		1429	{
		1430	SV *data;
		1431	dREQ;
		1432
		1433	data = newSV (NAME_MAX);
		1434	SvPOK_on (data);
		1435
		1436	req->type = REQ_READLINK;
		1437	req->fh = newSVsv (path);
		1438	req->ptr2 = SvPVbyte_nolen (req->fh);
		1439	req->sv1 = data;
		1440	req->ptr1 = SvPVbyte_nolen (data);
		1441
		1442	REQ_SEND;
		1443	}
		1444
		1445	void
769	aio_sendfile(out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	1446	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
770	SV * out_fh	1447	SV * out_fh
771	SV * in_fh	1448	SV * in_fh
772	UV in_offset	1449	UV in_offset
773	UV length	1450	UV length
774	SV * callback	1451	SV * callback
775	PROTOTYPE: $$$$;$	1452	PROTOTYPE: $$$$;$
776	CODE:	1453	PPCODE:
777	{	1454	{
778	dREQ;	1455	dREQ;
779		1456
780	req->type = REQ_SENDFILE;	1457	req->type = REQ_SENDFILE;
781	req->fh = newSVsv (out_fh);	1458	req->fh = newSVsv (out_fh);
782	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1459	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
783	req->fh2 = newSVsv (in_fh);	1460	req->sv2 = newSVsv (in_fh);
784	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1461	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
785	req->offset = in_offset;	1462	req->offs = in_offset;
786	req->length = length;	1463	req->size = length;
787		1464
788	send_req (req);	1465	REQ_SEND;
789	}	1466	}
790		1467
791	void	1468	void
792	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1469	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
793	SV * fh	1470	SV * fh
794	UV offset	1471	UV offset
795	IV length	1472	IV length
796	SV * callback	1473	SV * callback
797	PROTOTYPE: $$$;$	1474	PROTOTYPE: $$$;$
798	CODE:	1475	PPCODE:
799	{	1476	{
800	dREQ;	1477	dREQ;
801		1478
802	req->type = REQ_READAHEAD;	1479	req->type = REQ_READAHEAD;
803	req->fh = newSVsv (fh);	1480	req->fh = newSVsv (fh);
804	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1481	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
805	req->offset = offset;	1482	req->offs = offset;
806	req->length = length;	1483	req->size = length;
807		1484
808	send_req (req);	1485	REQ_SEND;
809	}	1486	}
810		1487
811	void	1488	void
812	aio_stat(fh_or_path,callback=&PL_sv_undef)	1489	aio_stat (fh_or_path,callback=&PL_sv_undef)
813	SV * fh_or_path	1490	SV8 * fh_or_path
814	SV * callback	1491	SV * callback
815	ALIAS:	1492	ALIAS:
816	aio_stat = REQ_STAT	1493	aio_stat = REQ_STAT
817	aio_lstat = REQ_LSTAT	1494	aio_lstat = REQ_LSTAT
818	CODE:	1495	PPCODE:
819	{	1496	{
820	dREQ;	1497	dREQ;
821		1498
822	New (0, req->statdata, 1, Stat_t);	1499	req->ptr2 = malloc (sizeof (Stat_t));
823	if (!req->statdata)	1500	if (!req->ptr2)
824	{	1501	{
825	free_req (req);	1502	req_free (req);
826	croak ("out of memory during aio_req->statdata allocation");	1503	croak ("out of memory during aio_stat statdata allocation");
827	}	1504	}
		1505
		1506	req->flags |= FLAG_PTR2_FREE;
828		1507
829	if (SvPOK (fh_or_path))	1508	if (SvPOK (fh_or_path))
830	{	1509	{
831	req->type = ix;	1510	req->type = ix;
832	req->data = newSVsv (fh_or_path);	1511	req->sv1 = newSVsv (fh_or_path);
833	req->dataptr = SvPVbyte_nolen (req->data);	1512	req->ptr1 = SvPVbyte_nolen (req->sv1);
834	}	1513	}
835	else	1514	else
836	{	1515	{
837	req->type = REQ_FSTAT;	1516	req->type = REQ_FSTAT;
838	req->fh = newSVsv (fh_or_path);	1517	req->fh = newSVsv (fh_or_path);
839	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1518	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
840	}	1519	}
841		1520
842	send_req (req);	1521	REQ_SEND;
843	}	1522	}
844		1523
845	void	1524	void
846	aio_unlink(pathname,callback=&PL_sv_undef)	1525	aio_unlink (pathname,callback=&PL_sv_undef)
847	SV * pathname	1526	SV8 * pathname
848	SV * callback	1527	SV * callback
849	ALIAS:	1528	ALIAS:
850	aio_unlink = REQ_UNLINK	1529	aio_unlink = REQ_UNLINK
851	aio_rmdir = REQ_RMDIR	1530	aio_rmdir = REQ_RMDIR
		1531	aio_readdir = REQ_READDIR
852	CODE:	1532	PPCODE:
853	{	1533	{
854	dREQ;	1534	dREQ;
855		1535
856	req->type = ix;	1536	req->type = ix;
857	req->data = newSVsv (pathname);	1537	req->sv1 = newSVsv (pathname);
858	req->dataptr = SvPVbyte_nolen (req->data);	1538	req->ptr1 = SvPVbyte_nolen (req->sv1);
859
860	send_req (req);
861	}
862		1539
		1540	REQ_SEND;
		1541	}
		1542
863	void	1543	void
864	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1544	aio_mkdir (pathname,mode,callback=&PL_sv_undef)
865	SV * oldpath	1545	SV8 * pathname
866	SV * newpath	1546	UV mode
867	SV * callback	1547	SV * callback
868	CODE:	1548	PPCODE:
869	{	1549	{
870	dREQ;	1550	dREQ;
871		1551
872	req->type = REQ_SYMLINK;	1552	req->type = REQ_MKDIR;
873	req->fh = newSVsv (oldpath);	1553	req->sv1 = newSVsv (pathname);
874	req->data2ptr = SvPVbyte_nolen (req->fh);	1554	req->ptr1 = SvPVbyte_nolen (req->sv1);
875	req->data = newSVsv (newpath);	1555	req->mode = mode;
876	req->dataptr = SvPVbyte_nolen (req->data);	1556
		1557	REQ_SEND;
		1558	}
		1559
		1560	void
		1561	aio_link (oldpath,newpath,callback=&PL_sv_undef)
		1562	SV8 * oldpath
		1563	SV8 * newpath
		1564	SV * callback
		1565	ALIAS:
		1566	aio_link = REQ_LINK
		1567	aio_symlink = REQ_SYMLINK
		1568	aio_rename = REQ_RENAME
		1569	PPCODE:
		1570	{
		1571	dREQ;
877		1572
878	send_req (req);	1573	req->type = ix;
		1574	req->fh = newSVsv (oldpath);
		1575	req->ptr2 = SvPVbyte_nolen (req->fh);
		1576	req->sv1 = newSVsv (newpath);
		1577	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1578
		1579	REQ_SEND;
879	}	1580	}
880		1581
881	void	1582	void
		1583	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
		1584	SV8 * pathname
		1585	UV mode
		1586	UV dev
		1587	SV * callback
		1588	PPCODE:
		1589	{
		1590	dREQ;
		1591
		1592	req->type = REQ_MKNOD;
		1593	req->sv1 = newSVsv (pathname);
		1594	req->ptr1 = SvPVbyte_nolen (req->sv1);
		1595	req->mode = (mode_t)mode;
		1596	req->offs = dev;
		1597
		1598	REQ_SEND;
		1599	}
		1600
		1601	void
		1602	aio_busy (delay,callback=&PL_sv_undef)
		1603	double delay
		1604	SV * callback
		1605	PPCODE:
		1606	{
		1607	dREQ;
		1608
		1609	req->type = REQ_BUSY;
		1610	req->int1 = delay < 0. ? 0 : delay;
		1611	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
		1612
		1613	REQ_SEND;
		1614	}
		1615
		1616	void
		1617	aio_group (callback=&PL_sv_undef)
		1618	SV * callback
		1619	PROTOTYPE: ;$
		1620	PPCODE:
		1621	{
		1622	dREQ;
		1623
		1624	req->type = REQ_GROUP;
		1625
		1626	req_send (req);
		1627	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1628	}
		1629
		1630	void
		1631	aio_nop (callback=&PL_sv_undef)
		1632	SV * callback
		1633	PPCODE:
		1634	{
		1635	dREQ;
		1636
		1637	req->type = REQ_NOP;
		1638
		1639	REQ_SEND;
		1640	}
		1641
		1642	int
		1643	aioreq_pri (int pri = 0)
		1644	PROTOTYPE: ;$
		1645	CODE:
		1646	RETVAL = next_pri - PRI_BIAS;
		1647	if (items > 0)
		1648	{
		1649	if (pri < PRI_MIN) pri = PRI_MIN;
		1650	if (pri > PRI_MAX) pri = PRI_MAX;
		1651	next_pri = pri + PRI_BIAS;
		1652	}
		1653	OUTPUT:
		1654	RETVAL
		1655
		1656	void
		1657	aioreq_nice (int nice = 0)
		1658	CODE:
		1659	nice = next_pri - nice;
		1660	if (nice < PRI_MIN) nice = PRI_MIN;
		1661	if (nice > PRI_MAX) nice = PRI_MAX;
		1662	next_pri = nice + PRI_BIAS;
		1663
		1664	void
882	flush()	1665	flush ()
883	PROTOTYPE:	1666	PROTOTYPE:
884	CODE:	1667	CODE:
885	while (nreqs)	1668	while (nreqs)
886	{	1669	{
887	poll_wait ();	1670	poll_wait ();
888	poll_cb ();	1671	poll_cb ();
889	}	1672	}
890		1673
891	void	1674	int
892	poll()	1675	poll()
893	PROTOTYPE:	1676	PROTOTYPE:
894	CODE:	1677	CODE:
895	if (nreqs)
896	{
897	poll_wait ();	1678	poll_wait ();
898	poll_cb ();	1679	RETVAL = poll_cb ();
899	}	1680	OUTPUT:
		1681	RETVAL
900		1682
901	int	1683	int
902	poll_fileno()	1684	poll_fileno()
903	PROTOTYPE:	1685	PROTOTYPE:
904	CODE:	1686	CODE:
…		…
916		1698
917	void	1699	void
918	poll_wait()	1700	poll_wait()
919	PROTOTYPE:	1701	PROTOTYPE:
920	CODE:	1702	CODE:
921	if (nreqs)
922	poll_wait ();	1703	poll_wait ();
		1704
		1705	void
		1706	setsig (int signum = SIGIO)
		1707	PROTOTYPE: ;$
		1708	CODE:
		1709	{
		1710	if (block_sig_level)
		1711	croak ("cannot call IO::AIO::setsig from within aio_block/callback");
		1712
		1713	LOCK (reslock);
		1714	main_tid = pthread_self ();
		1715	main_sig = signum;
		1716	UNLOCK (reslock);
		1717
		1718	if (main_sig && npending)
		1719	pthread_kill (main_tid, main_sig);
		1720	}
		1721
		1722	void
		1723	aio_block (SV *cb)
		1724	PROTOTYPE: &
		1725	PPCODE:
		1726	{
		1727	int count;
		1728
		1729	block_sig ();
		1730	PUSHMARK (SP);
		1731	PUTBACK;
		1732	count = call_sv (cb, GIMME_V | G_NOARGS | G_EVAL);
		1733	SPAGAIN;
		1734	unblock_sig ();
		1735
		1736	if (SvTRUE (ERRSV))
		1737	croak (0);
		1738
		1739	XSRETURN (count);
		1740	}
923		1741
924	int	1742	int
925	nreqs()	1743	nreqs()
926	PROTOTYPE:	1744	PROTOTYPE:
927	CODE:	1745	CODE:
928	RETVAL = nreqs;	1746	RETVAL = nreqs;
929	OUTPUT:	1747	OUTPUT:
930	RETVAL	1748	RETVAL
931		1749
		1750	int
		1751	nready()
		1752	PROTOTYPE:
		1753	CODE:
		1754	RETVAL = get_nready ();
		1755	OUTPUT:
		1756	RETVAL
		1757
		1758	int
		1759	npending()
		1760	PROTOTYPE:
		1761	CODE:
		1762	RETVAL = get_npending ();
		1763	OUTPUT:
		1764	RETVAL
		1765
		1766	int
		1767	nthreads()
		1768	PROTOTYPE:
		1769	CODE:
		1770	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1771	RETVAL = started;
		1772	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1773	OUTPUT:
		1774	RETVAL
		1775
		1776	PROTOTYPES: DISABLE
		1777
		1778	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1779
		1780	void
		1781	cancel (aio_req_ornot req)
		1782	CODE:
		1783	req_cancel (req);
		1784
		1785	void
		1786	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1787	CODE:
		1788	SvREFCNT_dec (req->callback);
		1789	req->callback = newSVsv (callback);
		1790
		1791	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1792
		1793	void
		1794	add (aio_req grp, ...)
		1795	PPCODE:
		1796	{
		1797	int i;
		1798	aio_req req;
		1799
		1800	if (main_sig && !block_sig_level)
		1801	croak ("aio_group->add called outside aio_block/callback context while IO::AIO::setsig is in use");
		1802
		1803	if (grp->int1 == 2)
		1804	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1805
		1806	for (i = 1; i < items; ++i )
		1807	{
		1808	if (GIMME_V != G_VOID)
		1809	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1810
		1811	req = SvAIO_REQ (ST (i));
		1812
		1813	if (req)
		1814	{
		1815	++grp->size;
		1816	req->grp = grp;
		1817
		1818	req->grp_prev = 0;
		1819	req->grp_next = grp->grp_first;
		1820
		1821	if (grp->grp_first)
		1822	grp->grp_first->grp_prev = req;
		1823
		1824	grp->grp_first = req;
		1825	}
		1826	}
		1827	}
		1828
		1829	void
		1830	cancel_subs (aio_req_ornot req)
		1831	CODE:
		1832	req_cancel_subs (req);
		1833
		1834	void
		1835	result (aio_req grp, ...)
		1836	CODE:
		1837	{
		1838	int i;
		1839	AV *av;
		1840
		1841	grp->errorno = errno;
		1842
		1843	av = newAV ();
		1844
		1845	for (i = 1; i < items; ++i )
		1846	av_push (av, newSVsv (ST (i)));
		1847
		1848	SvREFCNT_dec (grp->sv1);
		1849	grp->sv1 = (SV *)av;
		1850	}
		1851
		1852	void
		1853	errno (aio_req grp, int errorno = errno)
		1854	CODE:
		1855	grp->errorno = errorno;
		1856
		1857	void
		1858	limit (aio_req grp, int limit)
		1859	CODE:
		1860	grp->int2 = limit;
		1861	aio_grp_feed (grp);
		1862
		1863	void
		1864	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1865	CODE:
		1866	{
		1867	SvREFCNT_dec (grp->sv2);
		1868	grp->sv2 = newSVsv (callback);
		1869
		1870	if (grp->int2 <= 0)
		1871	grp->int2 = 2;
		1872
		1873	aio_grp_feed (grp);
		1874	}
		1875

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