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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.36 by root, Tue Aug 23 01:18:04 2005 UTC vs.
Revision 1.86 by root, Mon Oct 30 23:30:00 2006 UTC

		1	/* solaris */
		2	#define _POSIX_PTHREAD_SEMANTICS 1
		3
		4	#if __linux && !defined(_GNU_SOURCE)
		5	# define _GNU_SOURCE
		6	#endif
		7
		8	/* just in case */
1	#define _REENTRANT 1	9	#define _REENTRANT 1
		10
2	#include <errno.h>	11	#include <errno.h>
3		12
4	#include "EXTERN.h"	13	#include "EXTERN.h"
5	#include "perl.h"	14	#include "perl.h"
6	#include "XSUB.h"	15	#include "XSUB.h"
7		16
8	#include "autoconf/config.h"	17	#include "autoconf/config.h"
9		18
10	#include <pthread.h>	19	#include <pthread.h>
11		20
		21	#include <stddef.h>
		22	#include <errno.h>
		23	#include <sys/time.h>
		24	#include <sys/select.h>
12	#include <sys/types.h>	25	#include <sys/types.h>
13	#include <sys/stat.h>	26	#include <sys/stat.h>
14		27	#include <limits.h>
15	#include <unistd.h>	28	#include <unistd.h>
16	#include <fcntl.h>	29	#include <fcntl.h>
17	#include <signal.h>	30	#include <signal.h>
18	#include <sched.h>	31	#include <sched.h>
19		32
…		…
30	# else	43	# else
31	# error sendfile support requested but not available	44	# error sendfile support requested but not available
32	# endif	45	# endif
33	#endif	46	#endif
34		47
		48	/* number of seconds after which idle threads exit */
		49	#define IDLE_TIMEOUT 10
		50
		51	/* used for struct dirent, AIX doesn't provide it */
		52	#ifndef NAME_MAX
		53	# define NAME_MAX 4096
		54	#endif
		55
		56	#ifndef PTHREAD_STACK_MIN
		57	/* care for broken platforms, e.g. windows */
		58	# define PTHREAD_STACK_MIN 16384
		59	#endif
		60
35	#if __ia64	61	#if __ia64
36	# define STACKSIZE 65536	62	# define STACKSIZE 65536
		63	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		64	# define STACKSIZE PTHREAD_STACK_MIN
37	#else	65	#else
38	# define STACKSIZE 4096	66	# define STACKSIZE 16384
39	#endif	67	#endif
		68
		69	/* wether word reads are potentially non-atomic.
		70	* this is conservatice, likely most arches this runs
		71	* on have atomic word read/writes.
		72	*/
		73	#ifndef WORDACCESS_UNSAFE
		74	# if __i386 || __x86_64
		75	# define WORDACCESS_UNSAFE 0
		76	# else
		77	# define WORDACCESS_UNSAFE 1
		78	# endif
		79	#endif
		80
		81	/* buffer size for various temporary buffers */
		82	#define AIO_BUFSIZE 65536
		83
		84	#define dBUF \
		85	char *aio_buf; \
		86	LOCK (wrklock); \
		87	self->dbuf = aio_buf = malloc (AIO_BUFSIZE); \
		88	UNLOCK (wrklock); \
		89	if (!aio_buf) \
		90	return -1;
40		91
41	enum {	92	enum {
42	REQ_QUIT,	93	REQ_QUIT,
43	REQ_OPEN, REQ_CLOSE,	94	REQ_OPEN, REQ_CLOSE,
44	REQ_READ, REQ_WRITE, REQ_READAHEAD,	95	REQ_READ, REQ_WRITE, REQ_READAHEAD,
45	REQ_SENDFILE,	96	REQ_SENDFILE,
46	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	97	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
47	REQ_FSYNC, REQ_FDATASYNC,	98	REQ_FSYNC, REQ_FDATASYNC,
48	REQ_UNLINK, REQ_RMDIR,	99	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
49	REQ_SYMLINK,	100	REQ_MKNOD, REQ_READDIR,
		101	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		102	REQ_GROUP, REQ_NOP,
		103	REQ_BUSY,
50	};	104	};
51		105
		106	#define AIO_REQ_KLASS "IO::AIO::REQ"
		107	#define AIO_GRP_KLASS "IO::AIO::GRP"
		108
52	typedef struct aio_cb {	109	typedef struct aio_cb
		110	{
53	struct aio_cb *volatile next;	111	struct aio_cb *volatile next;
54		112
		113	SV *callback, *fh;
		114	SV *sv1, *sv2;
		115	void *ptr1, *ptr2;
		116	Stat_t *statdata;
		117	off_t offs;
		118	size_t size;
		119	ssize_t result;
		120
		121	STRLEN stroffset;
55	int type;	122	int type;
56		123	int int1, int2;
57	int fd, fd2;	124	int errorno;
58	off_t offset;
59	size_t length;
60	ssize_t result;
61	mode_t mode; /* open */	125	mode_t mode; /* open */
62	int errorno;
63	SV *data, *callback;
64	SV *fh, *fh2;
65	void *dataptr, *data2ptr;
66	STRLEN dataoffset;
67		126
68	Stat_t *statdata;	127	unsigned char flags;
		128	unsigned char pri;
		129
		130	SV *self; /* the perl counterpart of this request, if any */
		131	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
69	} aio_cb;	132	} aio_cb;
70		133
		134	enum {
		135	FLAG_CANCELLED = 0x01,
		136	FLAG_DATA_RO_OFF = 0x80, /* data was set readonly */
		137	};
		138
71	typedef aio_cb *aio_req;	139	typedef aio_cb *aio_req;
		140	typedef aio_cb *aio_req_ornot;
72		141
		142	enum {
		143	PRI_MIN = -4,
		144	PRI_MAX = 4,
		145
		146	DEFAULT_PRI = 0,
		147	PRI_BIAS = -PRI_MIN,
		148	NUM_PRI = PRI_MAX + PRI_BIAS + 1,
		149	};
		150
		151	#define AIO_TICKS ((1000000 + 1023) >> 10)
		152
		153	static unsigned int max_poll_time = 0;
		154	static unsigned int max_poll_reqs = 0;
		155
		156	/* calculcate time difference in ~1/AIO_TICKS of a second */
		157	static int tvdiff (struct timeval *tv1, struct timeval *tv2)
		158	{
		159	return (tv2->tv_sec - tv1->tv_sec ) * AIO_TICKS
		160	+ ((tv2->tv_usec - tv1->tv_usec) >> 10);
		161	}
		162
		163	static int next_pri = DEFAULT_PRI + PRI_BIAS;
		164
73	static int started, wanted;	165	static unsigned int started, idle, wanted;
74	static volatile int nreqs;	166
75	static int max_outstanding = 1<<30;	167	#if __linux && defined (PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP)
		168	# define AIO_MUTEX_INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
		169	#else
		170	# define AIO_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
		171	#endif
		172
		173	#define LOCK(mutex) pthread_mutex_lock (&(mutex))
		174	#define UNLOCK(mutex) pthread_mutex_unlock (&(mutex))
		175
		176	/* worker threads management */
		177	static pthread_mutex_t wrklock = AIO_MUTEX_INIT;
		178
		179	typedef struct worker {
		180	/* locked by wrklock */
		181	struct worker *prev, *next;
		182
		183	pthread_t tid;
		184
		185	/* locked by reslock, reqlock or wrklock */
		186	aio_req req; /* currently processed request */
		187	void *dbuf;
		188	DIR *dirp;
		189	} worker;
		190
		191	static worker wrk_first = { &wrk_first, &wrk_first, 0 };
		192
		193	static void worker_clear (worker *wrk)
		194	{
		195	if (wrk->dirp)
		196	{
		197	closedir (wrk->dirp);
		198	wrk->dirp = 0;
		199	}
		200
		201	if (wrk->dbuf)
		202	{
		203	free (wrk->dbuf);
		204	wrk->dbuf = 0;
		205	}
		206	}
		207
		208	static void worker_free (worker *wrk)
		209	{
		210	wrk->next->prev = wrk->prev;
		211	wrk->prev->next = wrk->next;
		212
		213	free (wrk);
		214	}
		215
		216	static volatile unsigned int nreqs, nready, npending;
		217	static volatile unsigned int max_idle = 4;
		218	static volatile unsigned int max_outstanding = 0xffffffff;
76	static int respipe [2];	219	static int respipe [2];
77		220
78	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	221	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
79	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	222	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
80	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	223	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
81		224
82	static volatile aio_req reqs, reqe; /* queue start, queue end */	225	#if WORDACCESS_UNSAFE
83	static volatile aio_req ress, rese; /* queue start, queue end */
84		226
85	static void free_req (aio_req req)	227	static unsigned int get_nready ()
86	{	228	{
87	if (req->data)	229	unsigned int retval;
88	SvREFCNT_dec (req->data);
89		230
90	if (req->fh)	231	LOCK (reqlock);
91	SvREFCNT_dec (req->fh);	232	retval = nready;
		233	UNLOCK (reqlock);
92		234
93	if (req->fh2)	235	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	}	236	}
104		237
105	static void	238	static unsigned int get_npending ()
106	poll_wait ()
107	{	239	{
108	if (nreqs && !ress)	240	unsigned int retval;
109	{
110	fd_set rfd;
111	FD_ZERO(&rfd);
112	FD_SET(respipe [0], &rfd);
113		241
114	select (respipe [0] + 1, &rfd, 0, 0, 0);	242	LOCK (reslock);
		243	retval = npending;
		244	UNLOCK (reslock);
		245
		246	return retval;
		247	}
		248
		249	static unsigned int get_nthreads ()
		250	{
		251	unsigned int retval;
		252
		253	LOCK (wrklock);
		254	retval = started;
		255	UNLOCK (wrklock);
		256
		257	return retval;
		258	}
		259
		260	#else
		261
		262	# define get_nready() nready
		263	# define get_npending() npending
		264	# define get_nthreads() started
		265
		266	#endif
		267
		268	/*
		269	* a somewhat faster data structure might be nice, but
		270	* with 8 priorities this actually needs <20 insns
		271	* per shift, the most expensive operation.
		272	*/
		273	typedef struct {
		274	aio_req qs[NUM_PRI], qe[NUM_PRI]; /* qstart, qend */
		275	int size;
		276	} reqq;
		277
		278	static reqq req_queue;
		279	static reqq res_queue;
		280
		281	int reqq_push (reqq *q, aio_req req)
		282	{
		283	int pri = req->pri;
		284	req->next = 0;
		285
		286	if (q->qe[pri])
115	}	287	{
116	}	288	q->qe[pri]->next = req;
117		289	q->qe[pri] = req;
118	static int
119	poll_cb ()
120	{
121	dSP;
122	int count = 0;
123	int do_croak = 0;
124	aio_req req;
125
126	for (;;)
127	{	290	}
128	pthread_mutex_lock (&reslock);	291	else
129	req = ress;	292	q->qe[pri] = q->qs[pri] = req;
		293
		294	return q->size++;
		295	}
		296
		297	aio_req reqq_shift (reqq *q)
		298	{
		299	int pri;
		300
		301	if (!q->size)
		302	return 0;
		303
		304	--q->size;
		305
		306	for (pri = NUM_PRI; pri--; )
		307	{
		308	aio_req req = q->qs[pri];
130		309
131	if (req)	310	if (req)
132	{	311	{
133	ress = req->next;	312	if (!(q->qs[pri] = req->next))
		313	q->qe[pri] = 0;
134		314
135	if (!ress)	315	return req;
		316	}
		317	}
		318
		319	abort ();
		320	}
		321
		322	static int poll_cb ();
		323	static void req_invoke (aio_req req);
		324	static void req_free (aio_req req);
		325	static void req_cancel (aio_req req);
		326
		327	/* must be called at most once */
		328	static SV *req_sv (aio_req req, const char *klass)
		329	{
		330	if (!req->self)
		331	{
		332	req->self = (SV *)newHV ();
		333	sv_magic (req->self, 0, PERL_MAGIC_ext, (char *)req, 0);
		334	}
		335
		336	return sv_2mortal (sv_bless (newRV_inc (req->self), gv_stashpv (klass, 1)));
		337	}
		338
		339	static aio_req SvAIO_REQ (SV *sv)
		340	{
		341	MAGIC *mg;
		342
		343	if (!sv_derived_from (sv, AIO_REQ_KLASS) || !SvROK (sv))
		344	croak ("object of class " AIO_REQ_KLASS " expected");
		345
		346	mg = mg_find (SvRV (sv), PERL_MAGIC_ext);
		347
		348	return mg ? (aio_req)mg->mg_ptr : 0;
		349	}
		350
		351	static void aio_grp_feed (aio_req grp)
		352	{
		353	while (grp->size < grp->int2 && !(grp->flags & FLAG_CANCELLED))
		354	{
		355	int old_len = grp->size;
		356
		357	if (grp->sv2 && SvOK (grp->sv2))
		358	{
		359	dSP;
		360
		361	ENTER;
		362	SAVETMPS;
		363	PUSHMARK (SP);
		364	XPUSHs (req_sv (grp, AIO_GRP_KLASS));
		365	PUTBACK;
		366	call_sv (grp->sv2, G_VOID | G_EVAL | G_KEEPERR);
		367	SPAGAIN;
		368	FREETMPS;
		369	LEAVE;
		370	}
		371
		372	/* stop if no progress has been made */
		373	if (old_len == grp->size)
		374	{
		375	SvREFCNT_dec (grp->sv2);
		376	grp->sv2 = 0;
		377	break;
		378	}
		379	}
		380	}
		381
		382	static void aio_grp_dec (aio_req grp)
		383	{
		384	--grp->size;
		385
		386	/* call feeder, if applicable */
		387	aio_grp_feed (grp);
		388
		389	/* finish, if done */
		390	if (!grp->size && grp->int1)
		391	{
		392	req_invoke (grp);
		393	req_free (grp);
		394	}
		395	}
		396
		397	static void req_invoke (aio_req req)
		398	{
		399	dSP;
		400
		401	if (req->flags & FLAG_DATA_RO_OFF)
		402	SvREADONLY_off (req->sv1);
		403
		404	if (req->statdata)
		405	{
		406	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		407	PL_laststatval = req->result;
		408	PL_statcache = *(req->statdata);
		409	}
		410
		411	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
		412	{
		413	ENTER;
		414	SAVETMPS;
		415	PUSHMARK (SP);
		416	EXTEND (SP, 1);
		417
		418	switch (req->type)
		419	{
		420	case REQ_READDIR:
136	{	421	{
137	/* read any signals sent by the worker threads */	422	SV *rv = &PL_sv_undef;
138	char buf [32];	423
139	while (read (respipe [0], buf, 32) == 32)	424	if (req->result >= 0)
140	;	425	{
		426	int i;
		427	char *buf = req->ptr2;
		428	AV *av = newAV ();
141		429
142	rese = 0;	430	av_extend (av, req->result - 1);
		431
		432	for (i = 0; i < req->result; ++i)
		433	{
		434	SV *sv = newSVpv (buf, 0);
		435
		436	av_store (av, i, sv);
		437	buf += SvCUR (sv) + 1;
		438	}
		439
		440	rv = sv_2mortal (newRV_noinc ((SV *)av));
		441	}
		442
		443	PUSHs (rv);
143	}	444	}
144	}
145
146	pthread_mutex_unlock (&reslock);
147
148	if (!req)
149	break;	445	break;
150		446
151	nreqs--;	447	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	{	448	{
179	/* convert fd to fh */	449	/* convert fd to fh */
180	SV *fh;	450	SV *fh;
181		451
		452	PUSHs (sv_2mortal (newSViv (req->result)));
182	PUTBACK;	453	PUTBACK;
183	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	454	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
184	SPAGAIN;	455	SPAGAIN;
185		456
186	fh = SvREFCNT_inc (POPs);	457	fh = SvREFCNT_inc (POPs);
187		458
188	PUSHMARK (SP);	459	PUSHMARK (SP);
189	XPUSHs (sv_2mortal (fh));	460	XPUSHs (sv_2mortal (fh));
190	}	461	}
191
192	if (SvOK (req->callback))
193	{	462	break;
194	PUTBACK;
195	call_sv (req->callback, G_VOID | G_EVAL);
196	SPAGAIN;
197		463
198	if (SvTRUE (ERRSV))	464	case REQ_GROUP:
		465	req->int1 = 2; /* mark group as finished */
		466
		467	if (req->sv1)
199	{	468	{
200	free_req (req);	469	int i;
201	croak (0);	470	AV *av = (AV *)req->sv1;
		471
		472	EXTEND (SP, AvFILL (av) + 1);
		473	for (i = 0; i <= AvFILL (av); ++i)
		474	PUSHs (*av_fetch (av, i, 0));
202	}	475	}
		476	break;
		477
		478	case REQ_NOP:
		479	case REQ_BUSY:
		480	break;
		481
		482	case REQ_READLINK:
		483	if (req->result > 0)
		484	{
		485	SvCUR_set (req->sv1, req->result);
		486	*SvEND (req->sv1) = 0;
		487	PUSHs (req->sv1);
203	}	488	}
		489	break;
204		490
205	LEAVE;	491	case REQ_READ:
206		492	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
207	errno = errorno;	493	*SvEND (req->sv1) = 0;
208	count++;	494	/* fall through */
		495	default:
		496	PUSHs (sv_2mortal (newSViv (req->result)));
		497	break;
209	}	498	}
210		499
		500	errno = req->errorno;
		501
		502	PUTBACK;
		503	call_sv (req->callback, G_VOID | G_EVAL);
		504	SPAGAIN;
		505
		506	FREETMPS;
		507	LEAVE;
		508	}
		509
		510	if (req->grp)
		511	{
		512	aio_req grp = req->grp;
		513
		514	/* unlink request */
		515	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		516	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		517
		518	if (grp->grp_first == req)
		519	grp->grp_first = req->grp_next;
		520
		521	aio_grp_dec (grp);
		522	}
		523
		524	if (SvTRUE (ERRSV))
		525	{
211	free_req (req);	526	req_free (req);
		527	croak (0);
		528	}
		529	}
		530
		531	static void req_free (aio_req req)
		532	{
		533	if (req->self)
212	}	534	{
		535	sv_unmagic (req->self, PERL_MAGIC_ext);
		536	SvREFCNT_dec (req->self);
		537	}
213		538
214	return count;	539	SvREFCNT_dec (req->fh);
		540	SvREFCNT_dec (req->sv1);
		541	SvREFCNT_dec (req->sv2);
		542	SvREFCNT_dec (req->callback);
		543	Safefree (req->statdata);
		544
		545	if (req->type == REQ_READDIR)
		546	free (req->ptr2);
		547
		548	Safefree (req);
		549	}
		550
		551	static void req_cancel_subs (aio_req grp)
		552	{
		553	aio_req sub;
		554
		555	if (grp->type != REQ_GROUP)
		556	return;
		557
		558	SvREFCNT_dec (grp->sv2);
		559	grp->sv2 = 0;
		560
		561	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		562	req_cancel (sub);
		563	}
		564
		565	static void req_cancel (aio_req req)
		566	{
		567	req->flags |= FLAG_CANCELLED;
		568
		569	req_cancel_subs (req);
215	}	570	}
216		571
217	static void *aio_proc(void *arg);	572	static void *aio_proc(void *arg);
218		573
219	static void
220	start_thread (void)	574	static void start_thread (void)
221	{	575	{
222	sigset_t fullsigset, oldsigset;	576	sigset_t fullsigset, oldsigset;
223	pthread_t tid;
224	pthread_attr_t attr;	577	pthread_attr_t attr;
		578
		579	worker *wrk = calloc (1, sizeof (worker));
		580
		581	if (!wrk)
		582	croak ("unable to allocate worker thread data");
225		583
226	pthread_attr_init (&attr);	584	pthread_attr_init (&attr);
227	pthread_attr_setstacksize (&attr, STACKSIZE);	585	pthread_attr_setstacksize (&attr, STACKSIZE);
228	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);	586	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		587	#ifdef PTHREAD_SCOPE_PROCESS
		588	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		589	#endif
229		590
230	sigfillset (&fullsigset);	591	sigfillset (&fullsigset);
		592
		593	LOCK (wrklock);
231	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	594	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
232		595
233	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)	596	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
		597	{
		598	wrk->prev = &wrk_first;
		599	wrk->next = wrk_first.next;
		600	wrk_first.next->prev = wrk;
		601	wrk_first.next = wrk;
234	started++;	602	++started;
		603	}
		604	else
		605	free (wrk);
235		606
236	sigprocmask (SIG_SETMASK, &oldsigset, 0);	607	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		608	UNLOCK (wrklock);
237	}	609	}
238		610
239	static void	611	static void maybe_start_thread ()
240	send_req (aio_req req)
241	{	612	{
242	while (started < wanted && nreqs >= started)	613	if (get_nthreads () >= wanted)
		614	return;
		615
		616	/* todo: maybe use idle here, but might be less exact */
		617	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		618	return;
		619
243	start_thread ();	620	start_thread ();
		621	}
244		622
		623	static void req_send (aio_req req)
		624	{
245	nreqs++;	625	++nreqs;
246		626
247	pthread_mutex_lock (&reqlock);	627	LOCK (reqlock);
248		628	++nready;
249	req->next = 0;	629	reqq_push (&req_queue, req);
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);	630	pthread_cond_signal (&reqwait);
260	pthread_mutex_unlock (&reqlock);	631	UNLOCK (reqlock);
261		632
262	if (nreqs > max_outstanding)	633	maybe_start_thread ();
263	for (;;)
264	{
265	poll_cb ();
266
267	if (nreqs <= max_outstanding)
268	break;
269
270	poll_wait ();
271	}
272	}	634	}
273		635
274	static void	636	static void end_thread (void)
275	end_thread (void)
276	{	637	{
277	aio_req req;	638	aio_req req;
		639
278	Newz (0, req, 1, aio_cb);	640	Newz (0, req, 1, aio_cb);
		641
279	req->type = REQ_QUIT;	642	req->type = REQ_QUIT;
		643	req->pri = PRI_MAX + PRI_BIAS;
280		644
281	send_req (req);	645	LOCK (reqlock);
		646	reqq_push (&req_queue, req);
		647	pthread_cond_signal (&reqwait);
		648	UNLOCK (reqlock);
		649
		650	LOCK (wrklock);
		651	--started;
		652	UNLOCK (wrklock);
		653	}
		654
		655	static void set_max_idle (int nthreads)
		656	{
		657	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		658	max_idle = nthreads <= 0 ? 1 : nthreads;
		659	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
282	}	660	}
283		661
284	static void min_parallel (int nthreads)	662	static void min_parallel (int nthreads)
285	{	663	{
286	if (wanted < nthreads)	664	if (wanted < nthreads)
287	wanted = nthreads;	665	wanted = nthreads;
288	}	666	}
289		667
290	static void max_parallel (int nthreads)	668	static void max_parallel (int nthreads)
291	{	669	{
292	int cur = started;
293
294	if (wanted > nthreads)	670	if (wanted > nthreads)
295	wanted = nthreads;	671	wanted = nthreads;
296		672
297	while (cur > wanted)
298	{
299	end_thread ();
300	cur--;
301	}
302
303	while (started > wanted)	673	while (started > wanted)
		674	end_thread ();
		675	}
		676
		677	static void poll_wait ()
		678	{
		679	fd_set rfd;
		680
		681	while (nreqs)
		682	{
		683	int size;
		684	if (WORDACCESS_UNSAFE) LOCK (reslock);
		685	size = res_queue.size;
		686	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		687
		688	if (size)
		689	return;
		690
		691	maybe_start_thread ();
		692
		693	FD_ZERO(&rfd);
		694	FD_SET(respipe [0], &rfd);
		695
		696	select (respipe [0] + 1, &rfd, 0, 0, 0);
304	{	697	}
		698	}
		699
		700	static int poll_cb ()
		701	{
		702	dSP;
		703	int count = 0;
		704	int maxreqs = max_poll_reqs;
		705	int do_croak = 0;
		706	struct timeval tv_start, tv_now;
		707	aio_req req;
		708
		709	if (max_poll_time)
		710	gettimeofday (&tv_start, 0);
		711
		712	for (;;)
		713	{
		714	for (;;)
		715	{
		716	maybe_start_thread ();
		717
		718	LOCK (reslock);
		719	req = reqq_shift (&res_queue);
		720
		721	if (req)
		722	{
		723	--npending;
		724
		725	if (!res_queue.size)
		726	{
		727	/* read any signals sent by the worker threads */
		728	char buf [32];
		729	while (read (respipe [0], buf, 32) == 32)
		730	;
		731	}
		732	}
		733
		734	UNLOCK (reslock);
		735
		736	if (!req)
		737	break;
		738
		739	--nreqs;
		740
		741	if (req->type == REQ_GROUP && req->size)
		742	{
		743	req->int1 = 1; /* mark request as delayed */
		744	continue;
		745	}
		746	else
		747	{
		748	req_invoke (req);
		749
		750	count++;
		751	}
		752
		753	req_free (req);
		754
		755	if (maxreqs && !--maxreqs)
		756	break;
		757
		758	if (max_poll_time)
		759	{
		760	gettimeofday (&tv_now, 0);
		761
		762	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
		763	break;
		764	}
		765	}
		766
		767	if (nreqs <= max_outstanding)
		768	break;
		769
305	poll_wait ();	770	poll_wait ();
306	poll_cb ();	771
		772	++maxreqs;
307	}	773	}
		774
		775	return count;
308	}	776	}
309		777
310	static void create_pipe ()	778	static void create_pipe ()
311	{	779	{
312	if (pipe (respipe))	780	if (pipe (respipe))
…		…
315	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	783	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
316	croak ("cannot set result pipe to nonblocking mode");	784	croak ("cannot set result pipe to nonblocking mode");
317		785
318	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	786	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
319	croak ("cannot set result pipe to nonblocking mode");	787	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	}	788	}
364		789
365	/*****************************************************************************/	790	/*****************************************************************************/
366	/* work around various missing functions */	791	/* work around various missing functions */
367		792
…		…
372	/*	797	/*
373	* make our pread/pwrite safe against themselves, but not against	798	* make our pread/pwrite safe against themselves, but not against
374	* normal read/write by using a mutex. slows down execution a lot,	799	* normal read/write by using a mutex. slows down execution a lot,
375	* but that's your problem, not mine.	800	* but that's your problem, not mine.
376	*/	801	*/
377	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	802	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
378		803
379	static ssize_t	804	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	{	805	{
382	ssize_t res;	806	ssize_t res;
383	off_t ooffset;	807	off_t ooffset;
384		808
385	pthread_mutex_lock (&iolock);	809	LOCK (preadwritelock);
386	ooffset = lseek (fd, 0, SEEK_CUR);	810	ooffset = lseek (fd, 0, SEEK_CUR);
387	lseek (fd, offset, SEEK_SET);	811	lseek (fd, offset, SEEK_SET);
388	res = read (fd, buf, count);	812	res = read (fd, buf, count);
389	lseek (fd, ooffset, SEEK_SET);	813	lseek (fd, ooffset, SEEK_SET);
390	pthread_mutex_unlock (&iolock);	814	UNLOCK (preadwritelock);
391		815
392	return res;	816	return res;
393	}	817	}
394		818
395	static ssize_t
396	pwrite (int fd, void *buf, size_t count, off_t offset)	819	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
397	{	820	{
398	ssize_t res;	821	ssize_t res;
399	off_t ooffset;	822	off_t ooffset;
400		823
401	pthread_mutex_lock (&iolock);	824	LOCK (preadwritelock);
402	ooffset = lseek (fd, 0, SEEK_CUR);	825	ooffset = lseek (fd, 0, SEEK_CUR);
403	lseek (fd, offset, SEEK_SET);	826	lseek (fd, offset, SEEK_SET);
404	res = write (fd, buf, count);	827	res = write (fd, buf, count);
405	lseek (fd, offset, SEEK_SET);	828	lseek (fd, offset, SEEK_SET);
406	pthread_mutex_unlock (&iolock);	829	UNLOCK (preadwritelock);
407		830
408	return res;	831	return res;
409	}	832	}
410	#endif	833	#endif
411		834
412	#if !HAVE_FDATASYNC	835	#if !HAVE_FDATASYNC
413	# define fdatasync fsync	836	# define fdatasync fsync
414	#endif	837	#endif
415		838
416	#if !HAVE_READAHEAD	839	#if !HAVE_READAHEAD
417	# define readahead aio_readahead	840	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
418		841
419	static char readahead_buf[4096];	842	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	{	843	{
		844	dBUF;
		845
424	while (count > 0)	846	while (count > 0)
425	{	847	{
426	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	848	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
427		849
428	pread (fd, readahead_buf, len, offset);	850	pread (fd, aio_buf, len, offset);
429	offset += len;	851	offset += len;
430	count -= len;	852	count -= len;
431	}	853	}
432		854
433	errno = 0;	855	errno = 0;
434	}	856	}
		857
435	#endif	858	#endif
436		859
		860	#if !HAVE_READDIR_R
		861	# define readdir_r aio_readdir_r
		862
		863	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		864
		865	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		866	{
		867	struct dirent *e;
		868	int errorno;
		869
		870	LOCK (readdirlock);
		871
		872	e = readdir (dirp);
		873	errorno = errno;
		874
		875	if (e)
		876	{
		877	*res = ent;
		878	strcpy (ent->d_name, e->d_name);
		879	}
		880	else
		881	*res = 0;
		882
		883	UNLOCK (readdirlock);
		884
		885	errno = errorno;
		886	return e ? 0 : -1;
		887	}
		888	#endif
		889
437	/* sendfile always needs emulation */	890	/* sendfile always needs emulation */
438	static ssize_t
439	sendfile_ (int ofd, int ifd, off_t offset, size_t count)	891	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
440	{	892	{
441	ssize_t res;	893	ssize_t res;
442		894
443	if (!count)	895	if (!count)
444	return 0;	896	return 0;
445		897
446	#if HAVE_SENDFILE	898	#if HAVE_SENDFILE
447	# if __linux	899	# if __linux
448	res = sendfile (ofd, ifd, &offset, count);	900	res = sendfile (ofd, ifd, &offset, count);
449		901
450	# elif __freebsd	902	# elif __freebsd
451	/*	903	/*
452	* Of course, the freebsd sendfile is a dire hack with no thoughts	904	* Of course, the freebsd sendfile is a dire hack with no thoughts
453	* wasted on making it similar to other I/O functions.	905	* wasted on making it similar to other I/O functions.
454	*/	906	*/
455	{	907	{
456	off_t sbytes;	908	off_t sbytes;
457	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);	909	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
458		910
459	if (res < 0 && sbytes)	911	if (res < 0 && sbytes)
460	/* maybe only on EAGAIN only: as usual, the manpage leaves you guessing */	912	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
461	res = sbytes;	913	res = sbytes;
462	}	914	}
463		915
464	# elif __hpux	916	# elif __hpux
465	res = sendfile (ofd, ifd, offset, count, 0, 0);	917	res = sendfile (ofd, ifd, offset, count, 0, 0);
466		918
467	# elif __solaris	919	# elif __solaris
468	{	920	{
469	struct sendfilevec vec;	921	struct sendfilevec vec;
470	size_t sbytes;	922	size_t sbytes;
471		923
472	vec.sfv_fd = ifd;	924	vec.sfv_fd = ifd;
473	vec.sfv_flag = 0;	925	vec.sfv_flag = 0;
474	vec.sfv_off = offset;	926	vec.sfv_off = offset;
475	vec.sfv_len = count;	927	vec.sfv_len = count;
476		928
477	res = sendfilev (ofd, &vec, 1, &sbytes);	929	res = sendfilev (ofd, &vec, 1, &sbytes);
478		930
479	if (res < 0 && sbytes)	931	if (res < 0 && sbytes)
480	res = sbytes;	932	res = sbytes;
481	}	933	}
482		934
483	# else
484	res = -1;
485	errno = ENOSYS;
486	# endif	935	# endif
		936	#else
		937	res = -1;
		938	errno = ENOSYS;
487	#endif	939	#endif
488		940
489	if (res < 0	941	if (res < 0
490	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK	942	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
491	#if __solaris	943	#if __solaris
492	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE	944	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
493	#endif	945	#endif
494	)	946	)
495	)	947	)
496	{	948	{
497	/* emulate sendfile. this is a major pain in the ass */	949	/* emulate sendfile. this is a major pain in the ass */
498	char *buf = malloc (4096);	950	dBUF;
		951
499	res = 0;	952	res = 0;
500		953
501	for (;;)	954	while (count)
502	{	955	{
503	ssize_t cnt;	956	ssize_t cnt;
504		957
505	cnt = pread (ifd, buf, 4096, offset);	958	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
506		959
507	if (cnt <= 0)	960	if (cnt <= 0)
508	{	961	{
509	if (cnt && !res) res = -1;	962	if (cnt && !res) res = -1;
510	break;	963	break;
511	}	964	}
512		965
513	cnt = write (ofd, buf, cnt);	966	cnt = write (ofd, aio_buf, cnt);
514		967
515	if (cnt <= 0)	968	if (cnt <= 0)
516	{	969	{
517	if (cnt && !res) res = -1;	970	if (cnt && !res) res = -1;
518	break;	971	break;
519	}	972	}
520		973
521	offset += cnt;	974	offset += cnt;
522	res += cnt;	975	res += cnt;
		976	count -= cnt;
523	}	977	}
524
525	{
526	int errorno = errno;
527	free (buf);
528	errno = errorno;
529	}
530	}	978	}
531		979
532	return res;	980	return res;
		981	}
		982
		983	/* read a full directory */
		984	static void scandir_ (aio_req req, worker *self)
		985	{
		986	DIR *dirp;
		987	union
		988	{
		989	struct dirent d;
		990	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		991	} *u;
		992	struct dirent *entp;
		993	char *name, *names;
		994	int memlen = 4096;
		995	int memofs = 0;
		996	int res = 0;
		997	int errorno;
		998
		999	LOCK (wrklock);
		1000	self->dirp = dirp = opendir (req->ptr1);
		1001	self->dbuf = u = malloc (sizeof (*u));
		1002	req->ptr2 = names = malloc (memlen);
		1003	UNLOCK (wrklock);
		1004
		1005	if (dirp && u && names)
		1006	for (;;)
		1007	{
		1008	errno = 0;
		1009	readdir_r (dirp, &u->d, &entp);
		1010
		1011	if (!entp)
		1012	break;
		1013
		1014	name = entp->d_name;
		1015
		1016	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1017	{
		1018	int len = strlen (name) + 1;
		1019
		1020	res++;
		1021
		1022	while (memofs + len > memlen)
		1023	{
		1024	memlen *= 2;
		1025	LOCK (wrklock);
		1026	req->ptr2 = names = realloc (names, memlen);
		1027	UNLOCK (wrklock);
		1028
		1029	if (!names)
		1030	break;
		1031	}
		1032
		1033	memcpy (names + memofs, name, len);
		1034	memofs += len;
		1035	}
		1036	}
		1037
		1038	if (errno)
		1039	res = -1;
		1040
		1041	req->result = res;
533	}	1042	}
534		1043
535	/*****************************************************************************/	1044	/*****************************************************************************/
536		1045
537	static void *
538	aio_proc (void *thr_arg)	1046	static void *aio_proc (void *thr_arg)
539	{	1047	{
540	aio_req req;	1048	aio_req req;
541	int type;	1049	struct timespec ts;
		1050	worker *self = (worker *)thr_arg;
542		1051
543	do	1052	/* try to distribute timeouts somewhat evenly */
		1053	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1054	* (1000000000UL / 1024UL);
		1055
		1056	for (;;)
544	{	1057	{
545	pthread_mutex_lock (&reqlock);	1058	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1059
		1060	LOCK (reqlock);
546		1061
547	for (;;)	1062	for (;;)
548	{	1063	{
549	req = reqs;	1064	self->req = req = reqq_shift (&req_queue);
550
551	if (reqs)
552	{
553	reqs = reqs->next;
554	if (!reqs) reqe = 0;
555	}
556		1065
557	if (req)	1066	if (req)
558	break;	1067	break;
559		1068
		1069	++idle;
		1070
		1071	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1072	== ETIMEDOUT)
		1073	{
		1074	if (idle > max_idle)
		1075	{
		1076	--idle;
		1077	UNLOCK (reqlock);
		1078	LOCK (wrklock);
		1079	--started;
		1080	UNLOCK (wrklock);
		1081	goto quit;
		1082	}
		1083
		1084	/* we are allowed to idle, so do so without any timeout */
560	pthread_cond_wait (&reqwait, &reqlock);	1085	pthread_cond_wait (&reqwait, &reqlock);
		1086	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1087	}
		1088
		1089	--idle;
561	}	1090	}
562		1091
563	pthread_mutex_unlock (&reqlock);	1092	--nready;
		1093
		1094	UNLOCK (reqlock);
564		1095
565	errno = 0; /* strictly unnecessary */	1096	errno = 0; /* strictly unnecessary */
566		1097
567	type = req->type;	1098	if (!(req->flags & FLAG_CANCELLED))
568
569	switch (type)	1099	switch (req->type)
570	{	1100	{
571	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	1101	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
572	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	1102	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
573		1103
574	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	1104	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
575	case REQ_SENDFILE: req->result = sendfile_ (req->fd, req->fd2, req->offset, req->length); break;	1105	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
576		1106
577	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1107	case REQ_STAT: req->result = stat (req->ptr1, req->statdata); break;
578	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1108	case REQ_LSTAT: req->result = lstat (req->ptr1, req->statdata); break;
579	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1109	case REQ_FSTAT: req->result = fstat (req->int1, req->statdata); break;
580		1110
581	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	1111	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
582	case REQ_CLOSE: req->result = close (req->fd); break;	1112	case REQ_CLOSE: req->result = close (req->int1); break;
583	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1113	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
584	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1114	case REQ_RMDIR: req->result = rmdir (req->ptr1); break;
		1115	case REQ_RENAME: req->result = rename (req->ptr2, req->ptr1); break;
		1116	case REQ_LINK: req->result = link (req->ptr2, req->ptr1); break;
585	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); break;	1117	case REQ_SYMLINK: req->result = symlink (req->ptr2, req->ptr1); break;
		1118	case REQ_MKNOD: req->result = mknod (req->ptr2, req->mode, (dev_t)req->offs); break;
		1119	case REQ_READLINK: req->result = readlink (req->ptr2, req->ptr1, NAME_MAX); break;
586		1120
587	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1121	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
588	case REQ_FSYNC: req->result = fsync (req->fd); break;	1122	case REQ_FSYNC: req->result = fsync (req->int1); break;
		1123	case REQ_READDIR: scandir_ (req, self); break;
589		1124
		1125	case REQ_BUSY:
		1126	{
		1127	struct timeval tv;
		1128
		1129	tv.tv_sec = req->int1;
		1130	tv.tv_usec = req->int2;
		1131
		1132	req->result = select (0, 0, 0, 0, &tv);
		1133	}
		1134
		1135	case REQ_GROUP:
		1136	case REQ_NOP:
		1137	break;
		1138
590	case REQ_QUIT:	1139	case REQ_QUIT:
591	break;	1140	goto quit;
592		1141
593	default:	1142	default:
594	req->result = ENOSYS;	1143	req->result = ENOSYS;
595	break;	1144	break;
596	}	1145	}
597		1146
598	req->errorno = errno;	1147	req->errorno = errno;
599		1148
600	pthread_mutex_lock (&reslock);	1149	LOCK (reslock);
601		1150
602	req->next = 0;	1151	++npending;
603		1152
604	if (rese)	1153	if (!reqq_push (&res_queue, req))
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 */	1154	/* write a dummy byte to the pipe so fh becomes ready */
614	write (respipe [1], &respipe, 1);	1155	write (respipe [1], &respipe, 1);
615	}
616		1156
617	pthread_mutex_unlock (&reslock);	1157	self->req = 0;
		1158	worker_clear (self);
		1159
		1160	UNLOCK (reslock);
618	}	1161	}
619	while (type != REQ_QUIT);	1162
		1163	quit:
		1164	LOCK (wrklock);
		1165	worker_free (self);
		1166	UNLOCK (wrklock);
620		1167
621	return 0;	1168	return 0;
		1169	}
		1170
		1171	/*****************************************************************************/
		1172
		1173	static void atfork_prepare (void)
		1174	{
		1175	LOCK (wrklock);
		1176	LOCK (reqlock);
		1177	LOCK (reslock);
		1178	#if !HAVE_PREADWRITE
		1179	LOCK (preadwritelock);
		1180	#endif
		1181	#if !HAVE_READDIR_R
		1182	LOCK (readdirlock);
		1183	#endif
		1184	}
		1185
		1186	static void atfork_parent (void)
		1187	{
		1188	#if !HAVE_READDIR_R
		1189	UNLOCK (readdirlock);
		1190	#endif
		1191	#if !HAVE_PREADWRITE
		1192	UNLOCK (preadwritelock);
		1193	#endif
		1194	UNLOCK (reslock);
		1195	UNLOCK (reqlock);
		1196	UNLOCK (wrklock);
		1197	}
		1198
		1199	static void atfork_child (void)
		1200	{
		1201	aio_req prv;
		1202
		1203	while (prv = reqq_shift (&req_queue))
		1204	req_free (prv);
		1205
		1206	while (prv = reqq_shift (&res_queue))
		1207	req_free (prv);
		1208
		1209	while (wrk_first.next != &wrk_first)
		1210	{
		1211	worker *wrk = wrk_first.next;
		1212
		1213	if (wrk->req)
		1214	req_free (wrk->req);
		1215
		1216	worker_clear (wrk);
		1217	worker_free (wrk);
		1218	}
		1219
		1220	started = 0;
		1221	idle = 0;
		1222	nreqs = 0;
		1223	nready = 0;
		1224	npending = 0;
		1225
		1226	close (respipe [0]);
		1227	close (respipe [1]);
		1228	create_pipe ();
		1229
		1230	atfork_parent ();
622	}	1231	}
623		1232
624	#define dREQ \	1233	#define dREQ \
625	aio_req req; \	1234	aio_req req; \
		1235	int req_pri = next_pri; \
		1236	next_pri = DEFAULT_PRI + PRI_BIAS; \
626	\	1237	\
627	if (SvOK (callback) && !SvROK (callback)) \	1238	if (SvOK (callback) && !SvROK (callback)) \
628	croak ("clalback must be undef or of reference type"); \	1239	croak ("callback must be undef or of reference type"); \
629	\	1240	\
630	Newz (0, req, 1, aio_cb); \	1241	Newz (0, req, 1, aio_cb); \
631	if (!req) \	1242	if (!req) \
632	croak ("out of memory during aio_req allocation"); \	1243	croak ("out of memory during aio_req allocation"); \
633	\	1244	\
634	req->callback = newSVsv (callback);	1245	req->callback = newSVsv (callback); \
		1246	req->pri = req_pri
		1247
		1248	#define REQ_SEND \
		1249	req_send (req); \
		1250	\
		1251	if (GIMME_V != G_VOID) \
		1252	XPUSHs (req_sv (req, AIO_REQ_KLASS));
635		1253
636	MODULE = IO::AIO PACKAGE = IO::AIO	1254	MODULE = IO::AIO PACKAGE = IO::AIO
637		1255
638	PROTOTYPES: ENABLE	1256	PROTOTYPES: ENABLE
639		1257
640	BOOT:	1258	BOOT:
641	{	1259	{
		1260	HV *stash = gv_stashpv ("IO::AIO", 1);
		1261
		1262	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
		1263	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1264	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1265	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1266	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1267	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
		1268
642	create_pipe ();	1269	create_pipe ();
643	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1270	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
644	}	1271	}
645		1272
646	void	1273	void
647	min_parallel(nthreads)	1274	max_poll_reqs (int nreqs)
648	int nthreads
649	PROTOTYPE: $	1275	PROTOTYPE: $
		1276	CODE:
		1277	max_poll_reqs = nreqs;
650		1278
651	void	1279	void
652	max_parallel(nthreads)	1280	max_poll_time (double nseconds)
653	int nthreads
654	PROTOTYPE: $	1281	PROTOTYPE: $
		1282	CODE:
		1283	max_poll_time = nseconds * AIO_TICKS;
		1284
		1285	void
		1286	min_parallel (int nthreads)
		1287	PROTOTYPE: $
		1288
		1289	void
		1290	max_parallel (int nthreads)
		1291	PROTOTYPE: $
		1292
		1293	void
		1294	max_idle (int nthreads)
		1295	PROTOTYPE: $
		1296	CODE:
		1297	set_max_idle (nthreads);
655		1298
656	int	1299	int
657	max_outstanding(nreqs)	1300	max_outstanding (int maxreqs)
658	int nreqs	1301	PROTOTYPE: $
659	PROTOTYPE: $
660	CODE:	1302	CODE:
661	RETVAL = max_outstanding;	1303	RETVAL = max_outstanding;
662	max_outstanding = nreqs;	1304	max_outstanding = maxreqs;
		1305	OUTPUT:
		1306	RETVAL
663		1307
664	void	1308	void
665	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1309	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
666	SV * pathname	1310	SV * pathname
667	int flags	1311	int flags
668	int mode	1312	int mode
669	SV * callback	1313	SV * callback
670	PROTOTYPE: $$$;$	1314	PROTOTYPE: $$$;$
671	CODE:	1315	PPCODE:
672	{	1316	{
673	dREQ;	1317	dREQ;
674		1318
675	req->type = REQ_OPEN;	1319	req->type = REQ_OPEN;
676	req->data = newSVsv (pathname);	1320	req->sv1 = newSVsv (pathname);
677	req->dataptr = SvPVbyte_nolen (req->data);	1321	req->ptr1 = SvPVbyte_nolen (pathname);
678	req->fd = flags;	1322	req->int1 = flags;
679	req->mode = mode;	1323	req->mode = mode;
680		1324
681	send_req (req);	1325	REQ_SEND;
682	}	1326	}
683		1327
684	void	1328	void
685	aio_close(fh,callback=&PL_sv_undef)	1329	aio_close (fh,callback=&PL_sv_undef)
686	SV * fh	1330	SV * fh
687	SV * callback	1331	SV * callback
688	PROTOTYPE: $;$	1332	PROTOTYPE: $;$
689	ALIAS:	1333	ALIAS:
690	aio_close = REQ_CLOSE	1334	aio_close = REQ_CLOSE
691	aio_fsync = REQ_FSYNC	1335	aio_fsync = REQ_FSYNC
692	aio_fdatasync = REQ_FDATASYNC	1336	aio_fdatasync = REQ_FDATASYNC
693	CODE:	1337	PPCODE:
694	{	1338	{
695	dREQ;	1339	dREQ;
696		1340
697	req->type = ix;	1341	req->type = ix;
698	req->fh = newSVsv (fh);	1342	req->fh = newSVsv (fh);
699	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1343	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
700		1344
701	send_req (req);	1345	REQ_SEND (req);
702	}	1346	}
703		1347
704	void	1348	void
705	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1349	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
706	SV * fh	1350	SV * fh
707	UV offset	1351	UV offset
708	UV length	1352	UV length
709	SV * data	1353	SV * data
710	UV dataoffset	1354	UV dataoffset
711	SV * callback	1355	SV * callback
712	ALIAS:	1356	ALIAS:
713	aio_read = REQ_READ	1357	aio_read = REQ_READ
714	aio_write = REQ_WRITE	1358	aio_write = REQ_WRITE
715	PROTOTYPE: $$$$$;$	1359	PROTOTYPE: $$$$$;$
716	CODE:	1360	PPCODE:
717	{	1361	{
718	aio_req req;
719	STRLEN svlen;	1362	STRLEN svlen;
720	char *svptr = SvPVbyte (data, svlen);	1363	char *svptr = SvPVbyte (data, svlen);
721		1364
722	SvUPGRADE (data, SVt_PV);	1365	SvUPGRADE (data, SVt_PV);
723	SvPOK_on (data);	1366	SvPOK_on (data);
…		…
745		1388
746	{	1389	{
747	dREQ;	1390	dREQ;
748		1391
749	req->type = ix;	1392	req->type = ix;
750	req->fh = newSVsv (fh);	1393	req->fh = newSVsv (fh);
751	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1394	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
752	: IoOFP (sv_2io (fh)));	1395	: IoOFP (sv_2io (fh)));
753	req->offset = offset;	1396	req->offs = offset;
754	req->length = length;	1397	req->size = length;
755	req->data = SvREFCNT_inc (data);	1398	req->sv1 = SvREFCNT_inc (data);
756	req->dataptr = (char *)svptr + dataoffset;	1399	req->ptr1 = (char *)svptr + dataoffset;
		1400	req->stroffset = dataoffset;
757		1401
758	if (!SvREADONLY (data))	1402	if (!SvREADONLY (data))
759	{	1403	{
760	SvREADONLY_on (data);	1404	SvREADONLY_on (data);
761	req->data2ptr = (void *)data;	1405	req->flags |= FLAG_DATA_RO_OFF;
762	}	1406	}
763		1407
764	send_req (req);	1408	REQ_SEND;
765	}	1409	}
766	}	1410	}
767		1411
768	void	1412	void
		1413	aio_readlink (path,callback=&PL_sv_undef)
		1414	SV * path
		1415	SV * callback
		1416	PROTOTYPE: $$;$
		1417	PPCODE:
		1418	{
		1419	SV *data;
		1420	dREQ;
		1421
		1422	data = newSV (NAME_MAX);
		1423	SvPOK_on (data);
		1424
		1425	req->type = REQ_READLINK;
		1426	req->fh = newSVsv (path);
		1427	req->ptr2 = SvPVbyte_nolen (path);
		1428	req->sv1 = data;
		1429	req->ptr1 = SvPVbyte_nolen (data);
		1430
		1431	REQ_SEND;
		1432	}
		1433
		1434	void
769	aio_sendfile(out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)	1435	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
770	SV * out_fh	1436	SV * out_fh
771	SV * in_fh	1437	SV * in_fh
772	UV in_offset	1438	UV in_offset
773	UV length	1439	UV length
774	SV * callback	1440	SV * callback
775	PROTOTYPE: $$$$;$	1441	PROTOTYPE: $$$$;$
776	CODE:	1442	PPCODE:
777	{	1443	{
778	dREQ;	1444	dREQ;
779		1445
780	req->type = REQ_SENDFILE;	1446	req->type = REQ_SENDFILE;
781	req->fh = newSVsv (out_fh);	1447	req->fh = newSVsv (out_fh);
782	req->fd = PerlIO_fileno (IoIFP (sv_2io (out_fh)));	1448	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
783	req->fh2 = newSVsv (in_fh);	1449	req->sv2 = newSVsv (in_fh);
784	req->fd2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));	1450	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
785	req->offset = in_offset;	1451	req->offs = in_offset;
786	req->length = length;	1452	req->size = length;
787		1453
788	send_req (req);	1454	REQ_SEND;
789	}	1455	}
790		1456
791	void	1457	void
792	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1458	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
793	SV * fh	1459	SV * fh
794	UV offset	1460	UV offset
795	IV length	1461	IV length
796	SV * callback	1462	SV * callback
797	PROTOTYPE: $$$;$	1463	PROTOTYPE: $$$;$
798	CODE:	1464	PPCODE:
799	{	1465	{
800	dREQ;	1466	dREQ;
801		1467
802	req->type = REQ_READAHEAD;	1468	req->type = REQ_READAHEAD;
803	req->fh = newSVsv (fh);	1469	req->fh = newSVsv (fh);
804	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1470	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
805	req->offset = offset;	1471	req->offs = offset;
806	req->length = length;	1472	req->size = length;
807		1473
808	send_req (req);	1474	REQ_SEND;
809	}	1475	}
810		1476
811	void	1477	void
812	aio_stat(fh_or_path,callback=&PL_sv_undef)	1478	aio_stat (fh_or_path,callback=&PL_sv_undef)
813	SV * fh_or_path	1479	SV * fh_or_path
814	SV * callback	1480	SV * callback
815	ALIAS:	1481	ALIAS:
816	aio_stat = REQ_STAT	1482	aio_stat = REQ_STAT
817	aio_lstat = REQ_LSTAT	1483	aio_lstat = REQ_LSTAT
818	CODE:	1484	PPCODE:
819	{	1485	{
820	dREQ;	1486	dREQ;
821		1487
822	New (0, req->statdata, 1, Stat_t);	1488	New (0, req->statdata, 1, Stat_t);
823	if (!req->statdata)	1489	if (!req->statdata)
824	{	1490	{
825	free_req (req);	1491	req_free (req);
826	croak ("out of memory during aio_req->statdata allocation");	1492	croak ("out of memory during aio_req->statdata allocation");
827	}	1493	}
828		1494
829	if (SvPOK (fh_or_path))	1495	if (SvPOK (fh_or_path))
830	{	1496	{
831	req->type = ix;	1497	req->type = ix;
832	req->data = newSVsv (fh_or_path);	1498	req->sv1 = newSVsv (fh_or_path);
833	req->dataptr = SvPVbyte_nolen (req->data);	1499	req->ptr1 = SvPVbyte_nolen (fh_or_path);
834	}	1500	}
835	else	1501	else
836	{	1502	{
837	req->type = REQ_FSTAT;	1503	req->type = REQ_FSTAT;
838	req->fh = newSVsv (fh_or_path);	1504	req->fh = newSVsv (fh_or_path);
839	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1505	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
840	}	1506	}
841		1507
842	send_req (req);	1508	REQ_SEND;
843	}	1509	}
844		1510
845	void	1511	void
846	aio_unlink(pathname,callback=&PL_sv_undef)	1512	aio_unlink (pathname,callback=&PL_sv_undef)
847	SV * pathname	1513	SV * pathname
848	SV * callback	1514	SV * callback
849	ALIAS:	1515	ALIAS:
850	aio_unlink = REQ_UNLINK	1516	aio_unlink = REQ_UNLINK
851	aio_rmdir = REQ_RMDIR	1517	aio_rmdir = REQ_RMDIR
		1518	aio_readdir = REQ_READDIR
852	CODE:	1519	PPCODE:
853	{	1520	{
854	dREQ;	1521	dREQ;
855		1522
856	req->type = ix;	1523	req->type = ix;
857	req->data = newSVsv (pathname);	1524	req->sv1 = newSVsv (pathname);
858	req->dataptr = SvPVbyte_nolen (req->data);	1525	req->ptr1 = SvPVbyte_nolen (pathname);
859		1526
860	send_req (req);	1527	REQ_SEND;
861	}	1528	}
862		1529
863	void	1530	void
864	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1531	aio_link (oldpath,newpath,callback=&PL_sv_undef)
865	SV * oldpath	1532	SV * oldpath
866	SV * newpath	1533	SV * newpath
867	SV * callback	1534	SV * callback
		1535	ALIAS:
		1536	aio_link = REQ_LINK
		1537	aio_symlink = REQ_SYMLINK
		1538	aio_rename = REQ_RENAME
868	CODE:	1539	PPCODE:
869	{	1540	{
870	dREQ;	1541	dREQ;
871		1542
872	req->type = REQ_SYMLINK;	1543	req->type = ix;
873	req->fh = newSVsv (oldpath);	1544	req->fh = newSVsv (oldpath);
874	req->data2ptr = SvPVbyte_nolen (req->fh);	1545	req->ptr2 = SvPVbyte_nolen (req->fh);
875	req->data = newSVsv (newpath);	1546	req->sv1 = newSVsv (newpath);
876	req->dataptr = SvPVbyte_nolen (req->data);	1547	req->ptr1 = SvPVbyte_nolen (newpath);
877		1548
878	send_req (req);	1549	REQ_SEND;
879	}	1550	}
880		1551
881	void	1552	void
		1553	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
		1554	SV * pathname
		1555	SV * callback
		1556	UV mode
		1557	UV dev
		1558	PPCODE:
		1559	{
		1560	dREQ;
		1561
		1562	req->type = REQ_MKNOD;
		1563	req->sv1 = newSVsv (pathname);
		1564	req->ptr1 = SvPVbyte_nolen (pathname);
		1565	req->mode = (mode_t)mode;
		1566	req->offs = dev;
		1567
		1568	REQ_SEND;
		1569	}
		1570
		1571	void
		1572	aio_busy (delay,callback=&PL_sv_undef)
		1573	double delay
		1574	SV * callback
		1575	PPCODE:
		1576	{
		1577	dREQ;
		1578
		1579	req->type = REQ_BUSY;
		1580	req->int1 = delay < 0. ? 0 : delay;
		1581	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
		1582
		1583	REQ_SEND;
		1584	}
		1585
		1586	void
		1587	aio_group (callback=&PL_sv_undef)
		1588	SV * callback
		1589	PROTOTYPE: ;$
		1590	PPCODE:
		1591	{
		1592	dREQ;
		1593
		1594	req->type = REQ_GROUP;
		1595
		1596	req_send (req);
		1597	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1598	}
		1599
		1600	void
		1601	aio_nop (callback=&PL_sv_undef)
		1602	SV * callback
		1603	PPCODE:
		1604	{
		1605	dREQ;
		1606
		1607	req->type = REQ_NOP;
		1608
		1609	REQ_SEND;
		1610	}
		1611
		1612	int
		1613	aioreq_pri (int pri = 0)
		1614	PROTOTYPE: ;$
		1615	CODE:
		1616	RETVAL = next_pri - PRI_BIAS;
		1617	if (items > 0)
		1618	{
		1619	if (pri < PRI_MIN) pri = PRI_MIN;
		1620	if (pri > PRI_MAX) pri = PRI_MAX;
		1621	next_pri = pri + PRI_BIAS;
		1622	}
		1623	OUTPUT:
		1624	RETVAL
		1625
		1626	void
		1627	aioreq_nice (int nice = 0)
		1628	CODE:
		1629	nice = next_pri - nice;
		1630	if (nice < PRI_MIN) nice = PRI_MIN;
		1631	if (nice > PRI_MAX) nice = PRI_MAX;
		1632	next_pri = nice + PRI_BIAS;
		1633
		1634	void
882	flush()	1635	flush ()
883	PROTOTYPE:	1636	PROTOTYPE:
884	CODE:	1637	CODE:
885	while (nreqs)	1638	while (nreqs)
886	{	1639	{
887	poll_wait ();	1640	poll_wait ();
888	poll_cb ();	1641	poll_cb (0);
889	}	1642	}
890		1643
891	void	1644	void
892	poll()	1645	poll()
893	PROTOTYPE:	1646	PROTOTYPE:
894	CODE:	1647	CODE:
895	if (nreqs)	1648	if (nreqs)
896	{	1649	{
897	poll_wait ();	1650	poll_wait ();
898	poll_cb ();	1651	poll_cb (0);
899	}	1652	}
900		1653
901	int	1654	int
902	poll_fileno()	1655	poll_fileno()
903	PROTOTYPE:	1656	PROTOTYPE:
…		…
927	CODE:	1680	CODE:
928	RETVAL = nreqs;	1681	RETVAL = nreqs;
929	OUTPUT:	1682	OUTPUT:
930	RETVAL	1683	RETVAL
931		1684
		1685	int
		1686	nready()
		1687	PROTOTYPE:
		1688	CODE:
		1689	RETVAL = get_nready ();
		1690	OUTPUT:
		1691	RETVAL
		1692
		1693	int
		1694	npending()
		1695	PROTOTYPE:
		1696	CODE:
		1697	RETVAL = get_npending ();
		1698	OUTPUT:
		1699	RETVAL
		1700
		1701	int
		1702	nthreads()
		1703	PROTOTYPE:
		1704	CODE:
		1705	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1706	RETVAL = started;
		1707	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1708	OUTPUT:
		1709	RETVAL
		1710
		1711	PROTOTYPES: DISABLE
		1712
		1713	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1714
		1715	void
		1716	cancel (aio_req_ornot req)
		1717	CODE:
		1718	req_cancel (req);
		1719
		1720	void
		1721	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1722	CODE:
		1723	SvREFCNT_dec (req->callback);
		1724	req->callback = newSVsv (callback);
		1725
		1726	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1727
		1728	void
		1729	add (aio_req grp, ...)
		1730	PPCODE:
		1731	{
		1732	int i;
		1733	aio_req req;
		1734
		1735	if (grp->int1 == 2)
		1736	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1737
		1738	for (i = 1; i < items; ++i )
		1739	{
		1740	if (GIMME_V != G_VOID)
		1741	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1742
		1743	req = SvAIO_REQ (ST (i));
		1744
		1745	if (req)
		1746	{
		1747	++grp->size;
		1748	req->grp = grp;
		1749
		1750	req->grp_prev = 0;
		1751	req->grp_next = grp->grp_first;
		1752
		1753	if (grp->grp_first)
		1754	grp->grp_first->grp_prev = req;
		1755
		1756	grp->grp_first = req;
		1757	}
		1758	}
		1759	}
		1760
		1761	void
		1762	cancel_subs (aio_req_ornot req)
		1763	CODE:
		1764	req_cancel_subs (req);
		1765
		1766	void
		1767	result (aio_req grp, ...)
		1768	CODE:
		1769	{
		1770	int i;
		1771	AV *av;
		1772
		1773	grp->errorno = errno;
		1774
		1775	av = newAV ();
		1776
		1777	for (i = 1; i < items; ++i )
		1778	av_push (av, newSVsv (ST (i)));
		1779
		1780	SvREFCNT_dec (grp->sv1);
		1781	grp->sv1 = (SV *)av;
		1782	}
		1783
		1784	void
		1785	errno (aio_req grp, int errorno = errno)
		1786	CODE:
		1787	grp->errorno = errorno;
		1788
		1789	void
		1790	limit (aio_req grp, int limit)
		1791	CODE:
		1792	grp->int2 = limit;
		1793	aio_grp_feed (grp);
		1794
		1795	void
		1796	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1797	CODE:
		1798	{
		1799	SvREFCNT_dec (grp->sv2);
		1800	grp->sv2 = newSVsv (callback);
		1801
		1802	if (grp->int2 <= 0)
		1803	grp->int2 = 2;
		1804
		1805	aio_grp_feed (grp);
		1806	}
		1807

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