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Comparing IO-AIO/AIO.xs (file contents):
Revision 1.39 by root, Mon Feb 6 23:54:12 2006 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
12	#include <stddef.h>	11	#include <stddef.h>
		12	#include <stdlib.h>
		13	#include <errno.h>
		14	#include <sys/time.h>
		15	#include <sys/select.h>
13	#include <sys/types.h>	16	#include <sys/types.h>
14	#include <sys/stat.h>	17	#include <sys/stat.h>
15	#include <limits.h>	18	#include <limits.h>
16	#include <unistd.h>	19	#include <unistd.h>
17	#include <fcntl.h>	20	#include <fcntl.h>
…		…
31	# else	34	# else
32	# error sendfile support requested but not available	35	# error sendfile support requested but not available
33	# endif	36	# endif
34	#endif	37	#endif
35		38
		39	/* number of seconds after which idle threads exit */
		40	#define IDLE_TIMEOUT 10
		41
36	/* used for struct dirent, AIX doesn't provide it */	42	/* used for struct dirent, AIX doesn't provide it */
37	#ifndef NAME_MAX	43	#ifndef NAME_MAX
38	# define NAME_MAX 4096	44	# define NAME_MAX 4096
39	#endif	45	#endif
40		46
41	#if __ia64	47	/* buffer size for various temporary buffers */
42	# define STACKSIZE 65536	48	#define AIO_BUFSIZE 65536
43	#else	49
44	# define STACKSIZE 8192	50	#define dBUF \
45	#endif	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 */
46		59
47	enum {	60	enum {
48	REQ_QUIT,	61	REQ_QUIT,
49	REQ_OPEN, REQ_CLOSE,	62	REQ_OPEN, REQ_CLOSE,
50	REQ_READ, REQ_WRITE, REQ_READAHEAD,	63	REQ_READ, REQ_WRITE, REQ_READAHEAD,
51	REQ_SENDFILE,	64	REQ_SENDFILE,
52	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	65	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
53	REQ_FSYNC, REQ_FDATASYNC,	66	REQ_FSYNC, REQ_FDATASYNC,
54	REQ_UNLINK, REQ_RMDIR,	67	REQ_UNLINK, REQ_RMDIR, REQ_MKDIR, REQ_RENAME,
55	REQ_READDIR,	68	REQ_MKNOD, REQ_READDIR,
56	REQ_SYMLINK,	69	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		70	REQ_GROUP, REQ_NOP,
		71	REQ_BUSY,
57	};	72	};
58		73
		74	#define AIO_REQ_KLASS "IO::AIO::REQ"
		75	#define AIO_GRP_KLASS "IO::AIO::GRP"
		76
59	typedef struct aio_cb {	77	typedef struct aio_cb
		78	{
60	struct aio_cb *volatile next;	79	struct aio_cb *volatile next;
61		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;
62	int type;	89	int type;
63		90	int int1, int2;
64	/* should receive a cleanup, with unions */	91	int errorno;
65	int fd, fd2;
66	off_t offset;
67	size_t length;
68	ssize_t result;
69	mode_t mode; /* open */	92	mode_t mode; /* open */
70	int errorno;
71	SV *data, *callback;
72	SV *fh, *fh2;
73	void *dataptr, *data2ptr;
74	STRLEN dataoffset;
75		93
76	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;
77	} aio_cb;	99	} aio_cb;
78		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
79	typedef aio_cb *aio_req;	107	typedef aio_cb *aio_req;
		108	typedef aio_cb *aio_req_ornot;
80		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
81	static int started, wanted;	167	static unsigned int started, idle, wanted;
82	static volatile int nreqs;	168
83	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;
84	static int respipe [2];	212	static int respipe [2];
85		213
86	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	214	static mutex_t reslock = MUTEX_INIT;
87	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	215	static mutex_t reqlock = MUTEX_INIT;
88	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	216	static cond_t reqwait = COND_INIT;
89		217
90	static volatile aio_req reqs, reqe; /* queue start, queue end */	218	#if WORDACCESS_UNSAFE
91	static volatile aio_req ress, rese; /* queue start, queue end */
92		219
		220	static unsigned int get_nready ()
		221	{
		222	unsigned int retval;
		223
		224	LOCK (reqlock);
		225	retval = nready;
		226	UNLOCK (reqlock);
		227
		228	return retval;
		229	}
		230
		231	static unsigned int get_npending ()
		232	{
		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])
		280	{
		281	q->qe[pri]->next = req;
		282	q->qe[pri] = req;
		283	}
		284	else
		285	q->qe[pri] = q->qs[pri] = req;
		286
		287	return q->size++;
		288	}
		289
		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--; )
		300	{
		301	aio_req req = q->qs[pri];
		302
		303	if (req)
		304	{
		305	if (!(q->qs[pri] = req->next))
		306	q->qe[pri] = 0;
		307
		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:
		420	{
		421	SV *rv = &PL_sv_undef;
		422
		423	if (req->result >= 0)
		424	{
		425	int i;
		426	char *buf = req->ptr2;
		427	AV *av = newAV ();
		428
		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);
		443	}
		444	break;
		445
		446	case REQ_OPEN:
		447	{
		448	/* convert fd to fh */
		449	SV *fh;
		450
		451	PUSHs (sv_2mortal (newSViv (req->result)));
		452	PUTBACK;
		453	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
		454	SPAGAIN;
		455
		456	fh = POPs;
		457	PUSHMARK (SP);
		458	XPUSHs (fh);
		459	}
		460	break;
		461
		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
93	static void free_req (aio_req req)	536	static void req_free (aio_req req)
94	{	537	{
95	if (req->data)
96	SvREFCNT_dec (req->data);
97
98	if (req->fh)	538	if (req->self)
		539	{
		540	sv_unmagic (req->self, PERL_MAGIC_ext);
		541	SvREFCNT_dec (req->self);
		542	}
		543
99	SvREFCNT_dec (req->fh);	544	SvREFCNT_dec (req->fh);
100		545	SvREFCNT_dec (req->sv1);
101	if (req->fh2)
102	SvREFCNT_dec (req->fh2);	546	SvREFCNT_dec (req->sv2);
103
104	if (req->statdata)
105	Safefree (req->statdata);
106
107	if (req->callback)
108	SvREFCNT_dec (req->callback);	547	SvREFCNT_dec (req->callback);
109		548
110	if (req->type == REQ_READDIR && req->result >= 0)	549	if (req->flags & FLAG_PTR2_FREE)
111	free (req->data2ptr);	550	free (req->ptr2);
112		551
113	Safefree (req);	552	Safefree (req);
114	}	553	}
115		554
116	static void	555	static void req_cancel_subs (aio_req grp)
117	poll_wait ()
118	{	556	{
119	if (nreqs && !ress)	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))
120	{	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	{
121	fd_set rfd;	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
122	FD_ZERO(&rfd);	687	FD_ZERO(&rfd);
123	FD_SET(respipe [0], &rfd);	688	FD_SET(respipe [0], &rfd);
124		689
125	select (respipe [0] + 1, &rfd, 0, 0, 0);	690	select (respipe [0] + 1, &rfd, 0, 0, 0);
126	}	691	}
127	}	692	}
128		693
129	static int	694	static int poll_cb ()
130	poll_cb ()
131	{	695	{
132	dSP;	696	dSP;
133	int count = 0;	697	int count = 0;
		698	int maxreqs = max_poll_reqs;
134	int do_croak = 0;	699	int do_croak = 0;
		700	struct timeval tv_start, tv_now;
135	aio_req req;	701	aio_req req;
		702
		703	if (max_poll_time)
		704	gettimeofday (&tv_start, 0);
		705
		706	block_sig ();
136		707
137	for (;;)	708	for (;;)
138	{	709	{
139	pthread_mutex_lock (&reslock);	710	for (;;)
140	req = ress;
141
142	if (req)
143	{	711	{
144	ress = req->next;	712	maybe_start_thread ();
145		713
		714	LOCK (reslock);
		715	req = reqq_shift (&res_queue);
		716
146	if (!ress)	717	if (req)
147	{	718	{
		719	--npending;
		720
		721	if (!res_queue.size)
		722	{
148	/* read any signals sent by the worker threads */	723	/* read any signals sent by the worker threads */
149	char buf [32];	724	char buf [4];
150	while (read (respipe [0], buf, 32) == 32)	725	while (read (respipe [0], buf, 4) == 4)
		726	;
151	;	727	}
152
153	rese = 0;
154	}	728	}
155	}
156		729
157	pthread_mutex_unlock (&reslock);	730	UNLOCK (reslock);
158		731
159	if (!req)	732	if (!req)
160	break;	733	break;
161		734
162	nreqs--;	735	--nreqs;
163		736
164	if (req->type == REQ_QUIT)
165	started--;
166	else
167	{
168	int errorno = errno;
169	errno = req->errorno;
170
171	if (req->type == REQ_READ)	737	if (req->type == REQ_GROUP && req->size)
172	SvCUR_set (req->data, req->dataoffset + (req->result > 0 ? req->result : 0));
173
174	if (req->data2ptr && (req->type == REQ_READ || req->type == REQ_WRITE))
175	SvREADONLY_off (req->data);
176
177	if (req->statdata)
178	{	738	{
179	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	739	req->int1 = 1; /* mark request as delayed */
180	PL_laststatval = req->result;	740	continue;
181	PL_statcache = *(req->statdata);
182	}
183
184	ENTER;
185	PUSHMARK (SP);
186
187	if (req->type == REQ_READDIR)
188	{
189	SV *rv = &PL_sv_undef;
190
191	if (req->result >= 0)
192	{
193	char *buf = req->data2ptr;
194	AV *av = newAV ();
195
196	while (req->result)
197	{
198	SV *sv = newSVpv (buf, 0);
199
200	av_push (av, sv);
201	buf += SvCUR (sv) + 1;
202	req->result--;
203	}
204
205	rv = sv_2mortal (newRV_noinc ((SV *)av));
206	}
207
208	XPUSHs (rv);
209	}	741	}
210	else	742	else
211	{	743	{
212	XPUSHs (sv_2mortal (newSViv (req->result)));	744	if (!req_invoke (req))
213
214	if (req->type == REQ_OPEN)
215	{	745	{
216	/* convert fd to fh */
217	SV *fh;
218
219	PUTBACK;
220	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
221	SPAGAIN;
222
223	fh = SvREFCNT_inc (POPs);
224
225	PUSHMARK (SP);
226	XPUSHs (sv_2mortal (fh));
227	}
228	}
229
230	if (SvOK (req->callback))
231	{
232	PUTBACK;
233	call_sv (req->callback, G_VOID | G_EVAL);
234	SPAGAIN;
235
236	if (SvTRUE (ERRSV))
237	{
238	free_req (req);	746	req_free (req);
		747	unblock_sig ();
239	croak (0);	748	croak (0);
240	}	749	}
		750
		751	count++;
241	}	752	}
242		753
243	LEAVE;	754	req_free (req);
244		755
245	errno = errorno;	756	if (maxreqs && !--maxreqs)
246	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	}
247	}	766	}
248		767
249	free_req (req);	768	if (nreqs <= max_outstanding)
		769	break;
		770
		771	poll_wait ();
		772
		773	++maxreqs;
250	}	774	}
251		775
		776	unblock_sig ();
252	return count;	777	return count;
253	}
254
255	static void *aio_proc(void *arg);
256
257	static void
258	start_thread (void)
259	{
260	sigset_t fullsigset, oldsigset;
261	pthread_t tid;
262	pthread_attr_t attr;
263
264	pthread_attr_init (&attr);
265	pthread_attr_setstacksize (&attr, STACKSIZE);
266	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
267
268	sigfillset (&fullsigset);
269	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
270
271	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
272	started++;
273
274	sigprocmask (SIG_SETMASK, &oldsigset, 0);
275	}
276
277	static void
278	send_req (aio_req req)
279	{
280	while (started < wanted && nreqs >= started)
281	start_thread ();
282
283	nreqs++;
284
285	pthread_mutex_lock (&reqlock);
286
287	req->next = 0;
288
289	if (reqe)
290	{
291	reqe->next = req;
292	reqe = req;
293	}
294	else
295	reqe = reqs = req;
296
297	pthread_cond_signal (&reqwait);
298	pthread_mutex_unlock (&reqlock);
299
300	if (nreqs > max_outstanding)
301	for (;;)
302	{
303	poll_cb ();
304
305	if (nreqs <= max_outstanding)
306	break;
307
308	poll_wait ();
309	}
310	}
311
312	static void
313	end_thread (void)
314	{
315	aio_req req;
316	Newz (0, req, 1, aio_cb);
317	req->type = REQ_QUIT;
318
319	send_req (req);
320	}
321
322	static void min_parallel (int nthreads)
323	{
324	if (wanted < nthreads)
325	wanted = nthreads;
326	}
327
328	static void max_parallel (int nthreads)
329	{
330	int cur = started;
331
332	if (wanted > nthreads)
333	wanted = nthreads;
334
335	while (cur > wanted)
336	{
337	end_thread ();
338	cur--;
339	}
340
341	while (started > wanted)
342	{
343	poll_wait ();
344	poll_cb ();
345	}
346	}	778	}
347		779
348	static void create_pipe ()	780	static void create_pipe ()
349	{	781	{
350	if (pipe (respipe))	782	if (pipe (respipe))
…		…
367	/*	799	/*
368	* make our pread/pwrite safe against themselves, but not against	800	* make our pread/pwrite safe against themselves, but not against
369	* 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,
370	* but that's your problem, not mine.	802	* but that's your problem, not mine.
371	*/	803	*/
372	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;	804	static mutex_t preadwritelock = MUTEX_INIT;
373		805
374	static ssize_t	806	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
375	pread (int fd, void *buf, size_t count, off_t offset)
376	{	807	{
377	ssize_t res;	808	ssize_t res;
378	off_t ooffset;	809	off_t ooffset;
379		810
380	pthread_mutex_lock (&preadwritelock);	811	LOCK (preadwritelock);
381	ooffset = lseek (fd, 0, SEEK_CUR);	812	ooffset = lseek (fd, 0, SEEK_CUR);
382	lseek (fd, offset, SEEK_SET);	813	lseek (fd, offset, SEEK_SET);
383	res = read (fd, buf, count);	814	res = read (fd, buf, count);
384	lseek (fd, ooffset, SEEK_SET);	815	lseek (fd, ooffset, SEEK_SET);
385	pthread_mutex_unlock (&preadwritelock);	816	UNLOCK (preadwritelock);
386		817
387	return res;	818	return res;
388	}	819	}
389		820
390	static ssize_t
391	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)
392	{	822	{
393	ssize_t res;	823	ssize_t res;
394	off_t ooffset;	824	off_t ooffset;
395		825
396	pthread_mutex_lock (&preadwritelock);	826	LOCK (preadwritelock);
397	ooffset = lseek (fd, 0, SEEK_CUR);	827	ooffset = lseek (fd, 0, SEEK_CUR);
398	lseek (fd, offset, SEEK_SET);	828	lseek (fd, offset, SEEK_SET);
399	res = write (fd, buf, count);	829	res = write (fd, buf, count);
400	lseek (fd, offset, SEEK_SET);	830	lseek (fd, offset, SEEK_SET);
401	pthread_mutex_unlock (&preadwritelock);	831	UNLOCK (preadwritelock);
402		832
403	return res;	833	return res;
404	}	834	}
405	#endif	835	#endif
406		836
407	#if !HAVE_FDATASYNC	837	#if !HAVE_FDATASYNC
408	# define fdatasync fsync	838	# define fdatasync fsync
409	#endif	839	#endif
410		840
411	#if !HAVE_READAHEAD	841	#if !HAVE_READAHEAD
412	# define readahead aio_readahead	842	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
413		843
414	static ssize_t	844	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
415	readahead (int fd, off_t offset, size_t count)
416	{	845	{
417	char readahead_buf[4096];	846	dBUF;
418		847
419	while (count > 0)	848	while (count > 0)
420	{	849	{
421	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	850	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
422		851
423	pread (fd, readahead_buf, len, offset);	852	pread (fd, aio_buf, len, offset);
424	offset += len;	853	offset += len;
425	count -= len;	854	count -= len;
426	}	855	}
427		856
428	errno = 0;	857	errno = 0;
429	}	858	}
		859
430	#endif	860	#endif
431		861
432	#if !HAVE_READDIR_R	862	#if !HAVE_READDIR_R
433	# define readdir_r aio_readdir_r	863	# define readdir_r aio_readdir_r
434		864
435	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;	865	static mutex_t readdirlock = MUTEX_INIT;
436		866
437	static int
438	readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)	867	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
439	{	868	{
440	struct dirent *e;	869	struct dirent *e;
441	int errorno;	870	int errorno;
442		871
443	pthread_mutex_lock (&readdirlock);	872	LOCK (readdirlock);
444		873
445	e = readdir (dirp);	874	e = readdir (dirp);
446	errorno = errno;	875	errorno = errno;
447		876
448	if (e)	877	if (e)
…		…
451	strcpy (ent->d_name, e->d_name);	880	strcpy (ent->d_name, e->d_name);
452	}	881	}
453	else	882	else
454	*res = 0;	883	*res = 0;
455		884
456	pthread_mutex_unlock (&readdirlock);	885	UNLOCK (readdirlock);
457		886
458	errno = errorno;	887	errno = errorno;
459	return e ? 0 : -1;	888	return e ? 0 : -1;
460	}	889	}
461	#endif	890	#endif
462		891
463	/* sendfile always needs emulation */	892	/* sendfile always needs emulation */
464	static ssize_t
465	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)
466	{	894	{
467	ssize_t res;	895	ssize_t res;
468		896
469	if (!count)	897	if (!count)
470	return 0;	898	return 0;
…		…
481	{	909	{
482	off_t sbytes;	910	off_t sbytes;
483	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	911	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
484		912
485	if (res < 0 && sbytes)	913	if (res < 0 && sbytes)
486	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	914	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
487	res = sbytes;	915	res = sbytes;
488	}	916	}
489		917
490	# elif __hpux	918	# elif __hpux
491	res = sendfile (ofd, ifd, offset, count, 0, 0);	919	res = sendfile (ofd, ifd, offset, count, 0, 0);
…		…
519	#endif	947	#endif
520	)	948	)
521	)	949	)
522	{	950	{
523	/* emulate sendfile. this is a major pain in the ass */	951	/* emulate sendfile. this is a major pain in the ass */
524	char buf[4096];	952	dBUF;
		953
525	res = 0;	954	res = 0;
526		955
527	while (count)	956	while (count)
528	{	957	{
529	ssize_t cnt;	958	ssize_t cnt;
530		959
531	cnt = pread (ifd, buf, count > 4096 ? 4096 : count, offset);	960	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
532		961
533	if (cnt <= 0)	962	if (cnt <= 0)
534	{	963	{
535	if (cnt && !res) res = -1;	964	if (cnt && !res) res = -1;
536	break;	965	break;
537	}	966	}
538		967
539	cnt = write (ofd, buf, cnt);	968	cnt = write (ofd, aio_buf, cnt);
540		969
541	if (cnt <= 0)	970	if (cnt <= 0)
542	{	971	{
543	if (cnt && !res) res = -1;	972	if (cnt && !res) res = -1;
544	break;	973	break;
…		…
552		981
553	return res;	982	return res;
554	}	983	}
555		984
556	/* read a full directory */	985	/* read a full directory */
557	static int	986	static void scandir_ (aio_req req, worker *self)
558	scandir_ (const char *path, void **namesp)
559	{	987	{
560	DIR *dirp = opendir (path);	988	DIR *dirp;
561	union	989	union
562	{	990	{
563	struct dirent d;	991	struct dirent d;
564	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];	992	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
565	} u;	993	} *u;
566	struct dirent *entp;	994	struct dirent *entp;
567	char *name, *names;	995	char *name, *names;
568	int memlen = 4096;	996	int memlen = 4096;
569	int memofs = 0;	997	int memofs = 0;
570	int res = 0;	998	int res = 0;
571	int errorno;	999	int errorno;
572		1000
573	if (!dirp)	1001	LOCK (wrklock);
574	return -1;	1002	self->dirp = dirp = opendir (req->ptr1);
575		1003	self->dbuf = u = malloc (sizeof (*u));
		1004	req->flags |= FLAG_PTR2_FREE;
576	names = malloc (memlen);	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;
		1045	}
		1046
		1047	/*****************************************************************************/
		1048
		1049	static void *aio_proc (void *thr_arg)
		1050	{
		1051	aio_req req;
		1052	struct timespec ts;
		1053	worker *self = (worker *)thr_arg;
		1054
		1055	/* try to distribute timeouts somewhat evenly */
		1056	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1057	* (1000000000UL / 1024UL);
577		1058
578	for (;;)	1059	for (;;)
579	{	1060	{
580	errno = 0, readdir_r (dirp, &u.d, &entp);	1061	ts.tv_sec = time (0) + IDLE_TIMEOUT;
581		1062
582	if (!entp)	1063	LOCK (reqlock);
583	break;
584
585	name = entp->d_name;
586
587	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
588	{
589	int len = strlen (name) + 1;
590
591	res++;
592
593	while (memofs + len > memlen)
594	{
595	memlen *= 2;
596	names = realloc (names, memlen);
597	if (!names)
598	break;
599	}
600
601	memcpy (names + memofs, name, len);
602	memofs += len;
603	}
604	}
605
606	errorno = errno;
607	closedir (dirp);
608
609	if (errorno)
610	{
611	free (names);
612	errno = errorno;
613	res = -1;
614	}
615
616	*namesp = (void *)names;
617	return res;
618	}
619
620	/*****************************************************************************/
621
622	static void *
623	aio_proc (void *thr_arg)
624	{
625	aio_req req;
626	int type;
627
628	do
629	{
630	pthread_mutex_lock (&reqlock);
631		1064
632	for (;;)	1065	for (;;)
633	{	1066	{
634	req = reqs;	1067	self->req = req = reqq_shift (&req_queue);
635
636	if (reqs)
637	{
638	reqs = reqs->next;
639	if (!reqs) reqe = 0;
640	}
641		1068
642	if (req)	1069	if (req)
643	break;	1070	break;
644		1071
645	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;
646	}	1093	}
647		1094
648	pthread_mutex_unlock (&reqlock);	1095	--nready;
		1096
		1097	UNLOCK (reqlock);
649		1098
650	errno = 0; /* strictly unnecessary */	1099	errno = 0; /* strictly unnecessary */
651		1100
652	type = req->type;	1101	if (!(req->flags & FLAG_CANCELLED))
653
654	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))
655	{	1158	{
656	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
657	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
658
659	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
660	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;
661
662	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
663	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
664	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
665
666	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
667	case REQ_CLOSE: req->result = close (req->fd); break;
668	case REQ_UNLINK: req->result = unlink (req->dataptr); break;
669	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;
670	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;
671
672	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
673	case REQ_FSYNC: req->result = fsync (req->fd); break;
674	case REQ_READDIR: req->result = scandir_ (req->dataptr, &req->data2ptr); break;
675
676	case REQ_QUIT:
677	break;
678
679	default:
680	req->result = ENOSYS;
681	break;
682	}
683
684	req->errorno = errno;
685
686	pthread_mutex_lock (&reslock);
687
688	req->next = 0;
689
690	if (rese)
691	{
692	rese->next = req;
693	rese = req;
694	}
695	else
696	{
697	rese = ress = req;
698
699	/* write a dummy byte to the pipe so fh becomes ready */	1159	/* write a dummy byte to the pipe so fh becomes ready */
700	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);
701	}	1165	}
702		1166
703	pthread_mutex_unlock (&reslock);	1167	self->req = 0;
		1168	worker_clear (self);
		1169
		1170	UNLOCK (reslock);
704	}	1171	}
705	while (type != REQ_QUIT);	1172
		1173	quit:
		1174	LOCK (wrklock);
		1175	worker_free (self);
		1176	UNLOCK (wrklock);
706		1177
707	return 0;	1178	return 0;
708	}	1179	}
709		1180
710	/*****************************************************************************/	1181	/*****************************************************************************/
711		1182
712	static void atfork_prepare (void)	1183	static void atfork_prepare (void)
713	{	1184	{
714	pthread_mutex_lock (&reqlock);	1185	LOCK (wrklock);
715	pthread_mutex_lock (&reslock);	1186	LOCK (reqlock);
		1187	LOCK (reslock);
716	#if !HAVE_PREADWRITE	1188	#if !HAVE_PREADWRITE
717	pthread_mutex_lock (&preadwritelock);	1189	LOCK (preadwritelock);
718	#endif	1190	#endif
719	#if !HAVE_READDIR_R	1191	#if !HAVE_READDIR_R
720	pthread_mutex_lock (&readdirlock);	1192	LOCK (readdirlock);
721	#endif	1193	#endif
722	}	1194	}
723		1195
724	static void atfork_parent (void)	1196	static void atfork_parent (void)
725	{	1197	{
726	#if !HAVE_READDIR_R	1198	#if !HAVE_READDIR_R
727	pthread_mutex_unlock (&readdirlock);	1199	UNLOCK (readdirlock);
728	#endif	1200	#endif
729	#if !HAVE_PREADWRITE	1201	#if !HAVE_PREADWRITE
730	pthread_mutex_unlock (&preadwritelock);	1202	UNLOCK (preadwritelock);
731	#endif	1203	#endif
732	pthread_mutex_unlock (&reslock);	1204	UNLOCK (reslock);
733	pthread_mutex_unlock (&reqlock);	1205	UNLOCK (reqlock);
		1206	UNLOCK (wrklock);
734	}	1207	}
735		1208
736	static void atfork_child (void)	1209	static void atfork_child (void)
737	{	1210	{
738	aio_req prv;	1211	aio_req prv;
739		1212
740	started = 0;	1213	while (prv = reqq_shift (&req_queue))
		1214	req_free (prv);
741		1215
742	while (reqs)	1216	while (prv = reqq_shift (&res_queue))
		1217	req_free (prv);
		1218
		1219	while (wrk_first.next != &wrk_first)
743	{	1220	{
744	prv = reqs;	1221	worker *wrk = wrk_first.next;
745	reqs = prv->next;	1222
746	free_req (prv);	1223	if (wrk->req)
		1224	req_free (wrk->req);
		1225
		1226	worker_clear (wrk);
		1227	worker_free (wrk);
747	}	1228	}
748		1229
749	reqs = reqe = 0;	1230	started = 0;
750		1231	idle = 0;
751	while (ress)	1232	nreqs = 0;
752	{	1233	nready = 0;
753	prv = ress;	1234	npending = 0;
754	ress = prv->next;
755	free_req (prv);
756	}
757
758	ress = rese = 0;
759		1235
760	close (respipe [0]);	1236	close (respipe [0]);
761	close (respipe [1]);	1237	close (respipe [1]);
762	create_pipe ();	1238	create_pipe ();
763		1239
764	atfork_parent ();	1240	atfork_parent ();
765	}	1241	}
766		1242
767	#define dREQ \	1243	#define dREQ \
768	aio_req req; \	1244	aio_req req; \
		1245	int req_pri = next_pri; \
		1246	next_pri = DEFAULT_PRI + PRI_BIAS; \
769	\	1247	\
770	if (SvOK (callback) && !SvROK (callback)) \	1248	if (SvOK (callback) && !SvROK (callback)) \
771	croak ("clalback must be undef or of reference type"); \	1249	croak ("callback must be undef or of reference type"); \
772	\	1250	\
773	Newz (0, req, 1, aio_cb); \	1251	Newz (0, req, 1, aio_cb); \
774	if (!req) \	1252	if (!req) \
775	croak ("out of memory during aio_req allocation"); \	1253	croak ("out of memory during aio_req allocation"); \
776	\	1254	\
777	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));
778		1263
779	MODULE = IO::AIO PACKAGE = IO::AIO	1264	MODULE = IO::AIO PACKAGE = IO::AIO
780		1265
781	PROTOTYPES: ENABLE	1266	PROTOTYPES: ENABLE
782		1267
783	BOOT:	1268	BOOT:
784	{	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
785	create_pipe ();	1280	create_pipe ();
786	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1281	ATFORK (atfork_prepare, atfork_parent, atfork_child);
787	}	1282	}
788		1283
789	void	1284	void
790	min_parallel(nthreads)	1285	max_poll_reqs (int nreqs)
791	int nthreads
792	PROTOTYPE: $	1286	PROTOTYPE: $
		1287	CODE:
		1288	max_poll_reqs = nreqs;
793		1289
794	void	1290	void
795	max_parallel(nthreads)	1291	max_poll_time (double nseconds)
796	int nthreads
797	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);
798		1309
799	int	1310	int
800	max_outstanding(nreqs)	1311	max_outstanding (int maxreqs)
801	int nreqs	1312	PROTOTYPE: $
802	PROTOTYPE: $
803	CODE:	1313	CODE:
804	RETVAL = max_outstanding;	1314	RETVAL = max_outstanding;
805	max_outstanding = nreqs;	1315	max_outstanding = maxreqs;
		1316	OUTPUT:
		1317	RETVAL
806		1318
807	void	1319	void
808	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1320	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
809	SV * pathname	1321	SV8 * pathname
810	int flags	1322	int flags
811	int mode	1323	int mode
812	SV * callback	1324	SV * callback
813	PROTOTYPE: $$$;$	1325	PROTOTYPE: $$$;$
814	CODE:	1326	PPCODE:
815	{	1327	{
816	dREQ;	1328	dREQ;
817		1329
818	req->type = REQ_OPEN;	1330	req->type = REQ_OPEN;
819	req->data = newSVsv (pathname);	1331	req->sv1 = newSVsv (pathname);
820	req->dataptr = SvPVbyte_nolen (req->data);	1332	req->ptr1 = SvPVbyte_nolen (req->sv1);
821	req->fd = flags;	1333	req->int1 = flags;
822	req->mode = mode;	1334	req->mode = mode;
823		1335
824	send_req (req);	1336	REQ_SEND;
825	}	1337	}
826		1338
827	void	1339	void
828	aio_close(fh,callback=&PL_sv_undef)	1340	aio_close (fh,callback=&PL_sv_undef)
829	SV * fh	1341	SV * fh
830	SV * callback	1342	SV * callback
831	PROTOTYPE: $;$	1343	PROTOTYPE: $;$
832	ALIAS:	1344	ALIAS:
833	aio_close = REQ_CLOSE	1345	aio_close = REQ_CLOSE
834	aio_fsync = REQ_FSYNC	1346	aio_fsync = REQ_FSYNC
835	aio_fdatasync = REQ_FDATASYNC	1347	aio_fdatasync = REQ_FDATASYNC
836	CODE:	1348	PPCODE:
837	{	1349	{
838	dREQ;	1350	dREQ;
839		1351
840	req->type = ix;	1352	req->type = ix;
841	req->fh = newSVsv (fh);	1353	req->fh = newSVsv (fh);
842	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1354	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
843		1355
844	send_req (req);	1356	REQ_SEND (req);
845	}	1357	}
846		1358
847	void	1359	void
848	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1360	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
849	SV * fh	1361	SV * fh
850	UV offset	1362	UV offset
851	UV length	1363	UV length
852	SV * data	1364	SV8 * data
853	UV dataoffset	1365	UV dataoffset
854	SV * callback	1366	SV * callback
855	ALIAS:	1367	ALIAS:
856	aio_read = REQ_READ	1368	aio_read = REQ_READ
857	aio_write = REQ_WRITE	1369	aio_write = REQ_WRITE
858	PROTOTYPE: $$$$$;$	1370	PROTOTYPE: $$$$$;$
859	CODE:	1371	PPCODE:
860	{	1372	{
861	aio_req req;
862	STRLEN svlen;	1373	STRLEN svlen;
863	char *svptr = SvPVbyte (data, svlen);	1374	char *svptr = SvPVbyte (data, svlen);
864		1375
865	SvUPGRADE (data, SVt_PV);	1376	SvUPGRADE (data, SVt_PV);
866	SvPOK_on (data);	1377	SvPOK_on (data);
…		…
878	length = svlen - dataoffset;	1389	length = svlen - dataoffset;
879	}	1390	}
880	else	1391	else
881	{	1392	{
882	/* read: grow scalar as necessary */	1393	/* read: grow scalar as necessary */
883	svptr = SvGROW (data, length + dataoffset);	1394	svptr = SvGROW (data, length + dataoffset + 1);
884	}	1395	}
885		1396
886	if (length < 0)	1397	if (length < 0)
887	croak ("length must not be negative");	1398	croak ("length must not be negative");
888		1399
889	{	1400	{
890	dREQ;	1401	dREQ;
891		1402
892	req->type = ix;	1403	req->type = ix;
893	req->fh = newSVsv (fh);	1404	req->fh = newSVsv (fh);
894	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1405	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
895	: IoOFP (sv_2io (fh)));	1406	: IoOFP (sv_2io (fh)));
896	req->offset = offset;	1407	req->offs = offset;
897	req->length = length;	1408	req->size = length;
898	req->data = SvREFCNT_inc (data);	1409	req->sv1 = SvREFCNT_inc (data);
899	req->dataptr = (char *)svptr + dataoffset;	1410	req->ptr1 = (char *)svptr + dataoffset;
		1411	req->stroffset = dataoffset;
900		1412
901	if (!SvREADONLY (data))	1413	if (!SvREADONLY (data))
902	{	1414	{
903	SvREADONLY_on (data);	1415	SvREADONLY_on (data);
904	req->data2ptr = (void *)data;	1416	req->flags |= FLAG_SV1_RO_OFF;
905	}	1417	}
906		1418
907	send_req (req);	1419	REQ_SEND;
908	}	1420	}
909	}	1421	}
910		1422
911	void	1423	void
		1424	aio_readlink (path,callback=&PL_sv_undef)
		1425	SV8 * path
		1426	SV * callback
		1427	PROTOTYPE: $$;$
		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
912	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)
913	SV * out_fh	1447	SV * out_fh
914	SV * in_fh	1448	SV * in_fh
915	UV in_offset	1449	UV in_offset
916	UV length	1450	UV length
917	SV * callback	1451	SV * callback
918	PROTOTYPE: $$$$;$	1452	PROTOTYPE: $$$$;$
919	CODE:	1453	PPCODE:
920	{	1454	{
921	dREQ;	1455	dREQ;
922		1456
923	req->type = REQ_SENDFILE;	1457	req->type = REQ_SENDFILE;
924	req->fh = newSVsv (out_fh);	1458	req->fh = newSVsv (out_fh);
925	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1459	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
926	req->fh2 = newSVsv (in_fh);	1460	req->sv2 = newSVsv (in_fh);
927	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1461	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
928	req->offset = in_offset;	1462	req->offs = in_offset;
929	req->length = length;	1463	req->size = length;
930		1464
931	send_req (req);	1465	REQ_SEND;
932	}	1466	}
933		1467
934	void	1468	void
935	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1469	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
936	SV * fh	1470	SV * fh
937	UV offset	1471	UV offset
938	IV length	1472	IV length
939	SV * callback	1473	SV * callback
940	PROTOTYPE: $$$;$	1474	PROTOTYPE: $$$;$
941	CODE:	1475	PPCODE:
942	{	1476	{
943	dREQ;	1477	dREQ;
944		1478
945	req->type = REQ_READAHEAD;	1479	req->type = REQ_READAHEAD;
946	req->fh = newSVsv (fh);	1480	req->fh = newSVsv (fh);
947	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1481	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
948	req->offset = offset;	1482	req->offs = offset;
949	req->length = length;	1483	req->size = length;
950		1484
951	send_req (req);	1485	REQ_SEND;
952	}	1486	}
953		1487
954	void	1488	void
955	aio_stat(fh_or_path,callback=&PL_sv_undef)	1489	aio_stat (fh_or_path,callback=&PL_sv_undef)
956	SV * fh_or_path	1490	SV8 * fh_or_path
957	SV * callback	1491	SV * callback
958	ALIAS:	1492	ALIAS:
959	aio_stat = REQ_STAT	1493	aio_stat = REQ_STAT
960	aio_lstat = REQ_LSTAT	1494	aio_lstat = REQ_LSTAT
961	CODE:	1495	PPCODE:
962	{	1496	{
963	dREQ;	1497	dREQ;
964		1498
965	New (0, req->statdata, 1, Stat_t);	1499	req->ptr2 = malloc (sizeof (Stat_t));
966	if (!req->statdata)	1500	if (!req->ptr2)
967	{	1501	{
968	free_req (req);	1502	req_free (req);
969	croak ("out of memory during aio_req->statdata allocation");	1503	croak ("out of memory during aio_stat statdata allocation");
970	}	1504	}
		1505
		1506	req->flags |= FLAG_PTR2_FREE;
971		1507
972	if (SvPOK (fh_or_path))	1508	if (SvPOK (fh_or_path))
973	{	1509	{
974	req->type = ix;	1510	req->type = ix;
975	req->data = newSVsv (fh_or_path);	1511	req->sv1 = newSVsv (fh_or_path);
976	req->dataptr = SvPVbyte_nolen (req->data);	1512	req->ptr1 = SvPVbyte_nolen (req->sv1);
977	}	1513	}
978	else	1514	else
979	{	1515	{
980	req->type = REQ_FSTAT;	1516	req->type = REQ_FSTAT;
981	req->fh = newSVsv (fh_or_path);	1517	req->fh = newSVsv (fh_or_path);
982	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1518	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
983	}	1519	}
984		1520
985	send_req (req);	1521	REQ_SEND;
986	}	1522	}
987		1523
988	void	1524	void
989	aio_unlink(pathname,callback=&PL_sv_undef)	1525	aio_unlink (pathname,callback=&PL_sv_undef)
990	SV * pathname	1526	SV8 * pathname
991	SV * callback	1527	SV * callback
992	ALIAS:	1528	ALIAS:
993	aio_unlink = REQ_UNLINK	1529	aio_unlink = REQ_UNLINK
994	aio_rmdir = REQ_RMDIR	1530	aio_rmdir = REQ_RMDIR
		1531	aio_readdir = REQ_READDIR
995	CODE:	1532	PPCODE:
996	{	1533	{
997	dREQ;	1534	dREQ;
998		1535
999	req->type = ix;	1536	req->type = ix;
1000	req->data = newSVsv (pathname);	1537	req->sv1 = newSVsv (pathname);
1001	req->dataptr = SvPVbyte_nolen (req->data);	1538	req->ptr1 = SvPVbyte_nolen (req->sv1);
1002
1003	send_req (req);
1004	}
1005		1539
		1540	REQ_SEND;
		1541	}
		1542
1006	void	1543	void
1007	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1544	aio_mkdir (pathname,mode,callback=&PL_sv_undef)
1008	SV * oldpath	1545	SV8 * pathname
1009	SV * newpath	1546	UV mode
1010	SV * callback	1547	SV * callback
1011	CODE:	1548	PPCODE:
1012	{	1549	{
1013	dREQ;	1550	dREQ;
1014		1551
1015	req->type = REQ_SYMLINK;	1552	req->type = REQ_MKDIR;
1016	req->fh = newSVsv (oldpath);	1553	req->sv1 = newSVsv (pathname);
1017	req->data2ptr = SvPVbyte_nolen (req->fh);	1554	req->ptr1 = SvPVbyte_nolen (req->sv1);
1018	req->data = newSVsv (newpath);	1555	req->mode = mode;
1019	req->dataptr = SvPVbyte_nolen (req->data);
1020
1021	send_req (req);
1022	}
1023		1556
		1557	REQ_SEND;
		1558	}
		1559
1024	void	1560	void
1025	aio_readdir(pathname,callback=&PL_sv_undef)	1561	aio_link (oldpath,newpath,callback=&PL_sv_undef)
1026	SV * pathname	1562	SV8 * oldpath
		1563	SV8 * newpath
1027	SV * callback	1564	SV * callback
		1565	ALIAS:
		1566	aio_link = REQ_LINK
		1567	aio_symlink = REQ_SYMLINK
		1568	aio_rename = REQ_RENAME
1028	CODE:	1569	PPCODE:
1029	{	1570	{
1030	dREQ;	1571	dREQ;
1031		1572
1032	req->type = REQ_READDIR;	1573	req->type = ix;
1033	req->data = newSVsv (pathname);	1574	req->fh = newSVsv (oldpath);
1034	req->dataptr = SvPVbyte_nolen (req->data);	1575	req->ptr2 = SvPVbyte_nolen (req->fh);
		1576	req->sv1 = newSVsv (newpath);
		1577	req->ptr1 = SvPVbyte_nolen (req->sv1);
1035		1578
1036	send_req (req);	1579	REQ_SEND;
1037	}	1580	}
1038		1581
1039	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
1040	flush()	1665	flush ()
1041	PROTOTYPE:	1666	PROTOTYPE:
1042	CODE:	1667	CODE:
1043	while (nreqs)	1668	while (nreqs)
1044	{	1669	{
1045	poll_wait ();	1670	poll_wait ();
1046	poll_cb ();	1671	poll_cb ();
1047	}	1672	}
1048		1673
1049	void	1674	int
1050	poll()	1675	poll()
1051	PROTOTYPE:	1676	PROTOTYPE:
1052	CODE:	1677	CODE:
1053	if (nreqs)
1054	{
1055	poll_wait ();	1678	poll_wait ();
1056	poll_cb ();	1679	RETVAL = poll_cb ();
1057	}	1680	OUTPUT:
		1681	RETVAL
1058		1682
1059	int	1683	int
1060	poll_fileno()	1684	poll_fileno()
1061	PROTOTYPE:	1685	PROTOTYPE:
1062	CODE:	1686	CODE:
…		…
1074		1698
1075	void	1699	void
1076	poll_wait()	1700	poll_wait()
1077	PROTOTYPE:	1701	PROTOTYPE:
1078	CODE:	1702	CODE:
1079	if (nreqs)
1080	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	}
1081		1741
1082	int	1742	int
1083	nreqs()	1743	nreqs()
1084	PROTOTYPE:	1744	PROTOTYPE:
1085	CODE:	1745	CODE:
1086	RETVAL = nreqs;	1746	RETVAL = nreqs;
1087	OUTPUT:	1747	OUTPUT:
1088	RETVAL	1748	RETVAL
1089		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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