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/cvs/IO-AIO/AIO.xs

Comparing IO-AIO/AIO.xs (file contents):
Revision 1.25 by root, Wed Aug 17 03:16:56 2005 UTC vs.
Revision 1.87 by root, Mon Oct 30 23:42:27 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
		19	#include <pthread.h>
		20
		21	#include <stddef.h>
		22	#include <errno.h>
		23	#include <sys/time.h>
		24	#include <sys/select.h>
10	#include <sys/types.h>	25	#include <sys/types.h>
11	#include <sys/stat.h>	26	#include <sys/stat.h>
12		27	#include <limits.h>
13	#include <unistd.h>	28	#include <unistd.h>
14	#include <fcntl.h>	29	#include <fcntl.h>
15	#include <signal.h>	30	#include <signal.h>
16	#include <sched.h>	31	#include <sched.h>
17		32
18	#include <pthread.h>	33	#if HAVE_SENDFILE
		34	# if __linux
		35	# include <sys/sendfile.h>
		36	# elif __freebsd
		37	# include <sys/socket.h>
		38	# include <sys/uio.h>
		39	# elif __hpux
		40	# include <sys/socket.h>
		41	# elif __solaris /* not yet */
		42	# include <sys/sendfile.h>
		43	# else
		44	# error sendfile support requested but not available
		45	# endif
		46	#endif
19		47
20	typedef void *InputStream; /* hack, but 5.6.1 is simply toooo old ;) */	48	/* number of seconds after which idle threads exit */
21	typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */	49	#define IDLE_TIMEOUT 10
22	typedef void *InOutStream; /* hack, but 5.6.1 is simply toooo old ;) */	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
23		60
24	#if __ia64	61	#if __ia64
25	# define STACKSIZE 65536	62	# define STACKSIZE 65536
		63	#elif __i386 || __x86_64 /* 16k is unreasonably high :( */
		64	# define STACKSIZE PTHREAD_STACK_MIN
26	#else	65	#else
27	# define STACKSIZE 4096	66	# define STACKSIZE 16384
28	#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;
29		91
30	enum {	92	enum {
31	REQ_QUIT,	93	REQ_QUIT,
32	REQ_OPEN, REQ_CLOSE,	94	REQ_OPEN, REQ_CLOSE,
33	REQ_READ, REQ_WRITE, REQ_READAHEAD,	95	REQ_READ, REQ_WRITE, REQ_READAHEAD,
		96	REQ_SENDFILE,
34	REQ_STAT, REQ_LSTAT, REQ_FSTAT,	97	REQ_STAT, REQ_LSTAT, REQ_FSTAT,
35	REQ_FSYNC, REQ_FDATASYNC,	98	REQ_FSYNC, REQ_FDATASYNC,
36	REQ_UNLINK, REQ_RMDIR,	99	REQ_UNLINK, REQ_RMDIR, REQ_RENAME,
37	REQ_SYMLINK,	100	REQ_MKNOD, REQ_READDIR,
		101	REQ_LINK, REQ_SYMLINK, REQ_READLINK,
		102	REQ_GROUP, REQ_NOP,
		103	REQ_BUSY,
38	};	104	};
39		105
		106	#define AIO_REQ_KLASS "IO::AIO::REQ"
		107	#define AIO_GRP_KLASS "IO::AIO::GRP"
		108
40	typedef struct aio_cb {	109	typedef struct aio_cb
		110	{
41	struct aio_cb *volatile next;	111	struct aio_cb *volatile next;
42		112
		113	SV *callback, *fh;
		114	SV *sv1, *sv2;
		115	void *ptr1, *ptr2;
		116	off_t offs;
		117	size_t size;
		118	ssize_t result;
		119
		120	STRLEN stroffset;
43	int type;	121	int type;
44		122	int int1, int2;
45	int fd;	123	int errorno;
46	off_t offset;
47	size_t length;
48	ssize_t result;
49	mode_t mode; /* open */	124	mode_t mode; /* open */
50	int errorno;
51	SV *data, *callback, *fh;
52	void *dataptr, *data2ptr;
53	STRLEN dataoffset;
54		125
55	Stat_t *statdata;	126	unsigned char flags;
		127	unsigned char pri;
		128
		129	SV *self; /* the perl counterpart of this request, if any */
		130	struct aio_cb *grp, *grp_prev, *grp_next, *grp_first;
56	} aio_cb;	131	} aio_cb;
57		132
		133	enum {
		134	FLAG_CANCELLED = 0x01,
		135	FLAG_SV1_RO_OFF = 0x40, /* data was set readonly */
		136	FLAG_PTR2_FREE = 0x80, /* need free(ptr2) */
		137	};
		138
58	typedef aio_cb *aio_req;	139	typedef aio_cb *aio_req;
		140	typedef aio_cb *aio_req_ornot;
59		141
60	static int started;	142	enum {
61	static volatile int nreqs;	143	PRI_MIN = -4,
62	static int max_outstanding = 1<<30;	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
		165	static unsigned int started, idle, wanted;
		166
		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;
63	static int respipe [2];	219	static int respipe [2];
64		220
65	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;	221	static pthread_mutex_t reslock = AIO_MUTEX_INIT;
66	static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;	222	static pthread_mutex_t reqlock = AIO_MUTEX_INIT;
67	static pthread_mutex_t frklock = PTHREAD_MUTEX_INITIALIZER;
68	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;	223	static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
69		224
70	static volatile aio_req reqs, reqe; /* queue start, queue end */	225	#if WORDACCESS_UNSAFE
71	static volatile aio_req ress, rese; /* queue start, queue end */
72		226
73	static void	227	static unsigned int get_nready ()
74	poll_wait ()
75	{	228	{
76	if (nreqs && !ress)	229	unsigned int retval;
		230
		231	LOCK (reqlock);
		232	retval = nready;
		233	UNLOCK (reqlock);
		234
		235	return retval;
		236	}
		237
		238	static unsigned int get_npending ()
		239	{
		240	unsigned int retval;
		241
		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])
77	{	287	{
78	fd_set rfd;	288	q->qe[pri]->next = req;
79	FD_ZERO(&rfd);	289	q->qe[pri] = req;
80	FD_SET(respipe [0], &rfd);
81
82	select (respipe [0] + 1, &rfd, 0, 0, 0);
83	}	290	}
84	}	291	else
		292	q->qe[pri] = q->qs[pri] = req;
85		293
86	static int	294	return q->size++;
87	poll_cb ()	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];
		309
		310	if (req)
		311	{
		312	if (!(q->qs[pri] = req->next))
		313	q->qe[pri] = 0;
		314
		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)
88	{	398	{
89	dSP;	399	dSP;
90	int count = 0;
91	int do_croak = 0;
92	aio_req req, prv;
93		400
94	pthread_mutex_lock (&reslock);	401	if (req->flags & FLAG_SV1_RO_OFF)
		402	SvREADONLY_off (req->sv1);
95		403
96	{	404	if (!(req->flags & FLAG_CANCELLED) && SvOK (req->callback))
97	/* read any signals sent by the worker threads */
98	char buf [32];
99	while (read (respipe [0], buf, 32) == 32)
100	;
101	}
102
103	req = ress;
104	ress = rese = 0;
105
106	pthread_mutex_unlock (&reslock);
107
108	while (req)
109	{	405	{
110	nreqs--;	406	ENTER;
		407	SAVETMPS;
		408	PUSHMARK (SP);
		409	EXTEND (SP, 1);
111		410
112	if (req->type == REQ_QUIT)	411	switch (req->type)
113	started--;
114	else
115	{	412	{
116	int errorno = errno;	413	case REQ_READDIR:
117	errno = req->errorno;
118
119	if (req->type == REQ_READ)
120	SvCUR_set (req->data, req->dataoffset
121	+ req->result > 0 ? req->result : 0);
122
123	if (req->data)
124	SvREFCNT_dec (req->data);
125
126	if (req->fh)
127	SvREFCNT_dec (req->fh);
128
129	if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
130	{	414	{
131	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;	415	SV *rv = &PL_sv_undef;
132	PL_laststatval = req->result;
133	PL_statcache = *(req->statdata);
134		416
135	Safefree (req->statdata);	417	if (req->result >= 0)
		418	{
		419	int i;
		420	char *buf = req->ptr2;
		421	AV *av = newAV ();
		422
		423	av_extend (av, req->result - 1);
		424
		425	for (i = 0; i < req->result; ++i)
		426	{
		427	SV *sv = newSVpv (buf, 0);
		428
		429	av_store (av, i, sv);
		430	buf += SvCUR (sv) + 1;
		431	}
		432
		433	rv = sv_2mortal (newRV_noinc ((SV *)av));
		434	}
		435
		436	PUSHs (rv);
136	}	437	}
		438	break;
137		439
138	ENTER;	440	case REQ_OPEN:
139	PUSHMARK (SP);
140	XPUSHs (sv_2mortal (newSViv (req->result)));
141
142	if (req->type == REQ_OPEN)
143	{	441	{
144	/* convert fd to fh */	442	/* convert fd to fh */
145	SV *fh;	443	SV *fh;
146		444
		445	PUSHs (sv_2mortal (newSViv (req->result)));
147	PUTBACK;	446	PUTBACK;
148	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);	447	call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
149	SPAGAIN;	448	SPAGAIN;
150		449
151	fh = SvREFCNT_inc (POPs);	450	fh = SvREFCNT_inc (POPs);
152		451
153	PUSHMARK (SP);	452	PUSHMARK (SP);
154	XPUSHs (sv_2mortal (fh));	453	XPUSHs (sv_2mortal (fh));
155	}	454	}
		455	break;
156		456
157	if (SvOK (req->callback))	457	case REQ_GROUP:
		458	req->int1 = 2; /* mark group as finished */
		459
		460	if (req->sv1)
158	{	461	{
159	PUTBACK;	462	int i;
160	call_sv (req->callback, G_VOID | G_EVAL);	463	AV *av = (AV *)req->sv1;
161	SPAGAIN;	464
		465	EXTEND (SP, AvFILL (av) + 1);
		466	for (i = 0; i <= AvFILL (av); ++i)
		467	PUSHs (*av_fetch (av, i, 0));
162	}	468	}
		469	break;
163		470
164	do_croak = SvTRUE (ERRSV);	471	case REQ_NOP:
		472	case REQ_BUSY:
		473	break;
165		474
166	LEAVE;	475	case REQ_READLINK:
		476	if (req->result > 0)
167		477	{
168	if (req->callback)	478	SvCUR_set (req->sv1, req->result);
169	SvREFCNT_dec (req->callback);	479	*SvEND (req->sv1) = 0;
		480	PUSHs (req->sv1);
		481	}
		482	break;
170		483
171	errno = errorno;	484	case REQ_STAT:
172	count++;	485	case REQ_LSTAT:
		486	case REQ_FSTAT:
		487	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
		488	PL_laststatval = req->result;
		489	PL_statcache = *(Stat_t *)(req->ptr2);
		490	PUSHs (sv_2mortal (newSViv (req->result)));
		491	break;
		492
		493	case REQ_READ:
		494	SvCUR_set (req->sv1, req->stroffset + (req->result > 0 ? req->result : 0));
		495	*SvEND (req->sv1) = 0;
		496	PUSHs (sv_2mortal (newSViv (req->result)));
		497	break;
		498
		499	default:
		500	PUSHs (sv_2mortal (newSViv (req->result)));
		501	break;
173	}	502	}
174		503
175	prv = req;	504	errno = req->errorno;
176	req = req->next;
177	Safefree (prv);
178		505
179	if (do_croak)	506	PUTBACK;
180	croak (0);	507	call_sv (req->callback, G_VOID | G_EVAL);
		508	SPAGAIN;
		509
		510	FREETMPS;
		511	LEAVE;
181	}	512	}
182		513
183	return count;	514	if (req->grp)
		515	{
		516	aio_req grp = req->grp;
		517
		518	/* unlink request */
		519	if (req->grp_next) req->grp_next->grp_prev = req->grp_prev;
		520	if (req->grp_prev) req->grp_prev->grp_next = req->grp_next;
		521
		522	if (grp->grp_first == req)
		523	grp->grp_first = req->grp_next;
		524
		525	aio_grp_dec (grp);
		526	}
		527
		528	if (SvTRUE (ERRSV))
		529	{
		530	req_free (req);
		531	croak (0);
		532	}
		533	}
		534
		535	static void req_free (aio_req req)
		536	{
		537	if (req->self)
		538	{
		539	sv_unmagic (req->self, PERL_MAGIC_ext);
		540	SvREFCNT_dec (req->self);
		541	}
		542
		543	SvREFCNT_dec (req->fh);
		544	SvREFCNT_dec (req->sv1);
		545	SvREFCNT_dec (req->sv2);
		546	SvREFCNT_dec (req->callback);
		547
		548	if (req->flags & FLAG_PTR2_FREE)
		549	free (req->ptr2);
		550
		551	Safefree (req);
		552	}
		553
		554	static void req_cancel_subs (aio_req grp)
		555	{
		556	aio_req sub;
		557
		558	if (grp->type != REQ_GROUP)
		559	return;
		560
		561	SvREFCNT_dec (grp->sv2);
		562	grp->sv2 = 0;
		563
		564	for (sub = grp->grp_first; sub; sub = sub->grp_next)
		565	req_cancel (sub);
		566	}
		567
		568	static void req_cancel (aio_req req)
		569	{
		570	req->flags |= FLAG_CANCELLED;
		571
		572	req_cancel_subs (req);
184	}	573	}
185		574
186	static void *aio_proc(void *arg);	575	static void *aio_proc(void *arg);
187		576
188	static void
189	start_thread (void)	577	static void start_thread (void)
190	{	578	{
191	sigset_t fullsigset, oldsigset;	579	sigset_t fullsigset, oldsigset;
192	pthread_t tid;
193	pthread_attr_t attr;	580	pthread_attr_t attr;
		581
		582	worker *wrk = calloc (1, sizeof (worker));
		583
		584	if (!wrk)
		585	croak ("unable to allocate worker thread data");
194		586
195	pthread_attr_init (&attr);	587	pthread_attr_init (&attr);
196	pthread_attr_setstacksize (&attr, STACKSIZE);	588	pthread_attr_setstacksize (&attr, STACKSIZE);
197	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);	589	pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
		590	#ifdef PTHREAD_SCOPE_PROCESS
		591	pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
		592	#endif
198		593
199	sigfillset (&fullsigset);	594	sigfillset (&fullsigset);
		595
		596	LOCK (wrklock);
200	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);	597	sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
201		598
202	if (pthread_create (&tid, &attr, aio_proc, 0) == 0)	599	if (pthread_create (&wrk->tid, &attr, aio_proc, (void *)wrk) == 0)
203	started++;
204
205	sigprocmask (SIG_SETMASK, &oldsigset, 0);
206	}
207
208	static void
209	send_req (aio_req req)
210	{
211	nreqs++;
212
213	pthread_mutex_lock (&reqlock);
214
215	req->next = 0;
216
217	if (reqe)
218	{	600	{
219	reqe->next = req;	601	wrk->prev = &wrk_first;
220	reqe = req;	602	wrk->next = wrk_first.next;
		603	wrk_first.next->prev = wrk;
		604	wrk_first.next = wrk;
		605	++started;
221	}	606	}
222	else	607	else
223	reqe = reqs = req;	608	free (wrk);
224		609
		610	sigprocmask (SIG_SETMASK, &oldsigset, 0);
		611	UNLOCK (wrklock);
		612	}
		613
		614	static void maybe_start_thread ()
		615	{
		616	if (get_nthreads () >= wanted)
		617	return;
		618
		619	/* todo: maybe use idle here, but might be less exact */
		620	if (0 <= (int)get_nthreads () + (int)get_npending () - (int)nreqs)
		621	return;
		622
		623	start_thread ();
		624	}
		625
		626	static void req_send (aio_req req)
		627	{
		628	++nreqs;
		629
		630	LOCK (reqlock);
		631	++nready;
		632	reqq_push (&req_queue, req);
225	pthread_cond_signal (&reqwait);	633	pthread_cond_signal (&reqwait);
226	pthread_mutex_unlock (&reqlock);	634	UNLOCK (reqlock);
227		635
228	while (nreqs > max_outstanding)	636	maybe_start_thread ();
		637	}
		638
		639	static void end_thread (void)
		640	{
		641	aio_req req;
		642
		643	Newz (0, req, 1, aio_cb);
		644
		645	req->type = REQ_QUIT;
		646	req->pri = PRI_MAX + PRI_BIAS;
		647
		648	LOCK (reqlock);
		649	reqq_push (&req_queue, req);
		650	pthread_cond_signal (&reqwait);
		651	UNLOCK (reqlock);
		652
		653	LOCK (wrklock);
		654	--started;
		655	UNLOCK (wrklock);
		656	}
		657
		658	static void set_max_idle (int nthreads)
		659	{
		660	if (WORDACCESS_UNSAFE) LOCK (reqlock);
		661	max_idle = nthreads <= 0 ? 1 : nthreads;
		662	if (WORDACCESS_UNSAFE) UNLOCK (reqlock);
		663	}
		664
		665	static void min_parallel (int nthreads)
		666	{
		667	if (wanted < nthreads)
		668	wanted = nthreads;
		669	}
		670
		671	static void max_parallel (int nthreads)
		672	{
		673	if (wanted > nthreads)
		674	wanted = nthreads;
		675
		676	while (started > wanted)
		677	end_thread ();
		678	}
		679
		680	static void poll_wait ()
		681	{
		682	fd_set rfd;
		683
		684	while (nreqs)
229	{	685	{
		686	int size;
		687	if (WORDACCESS_UNSAFE) LOCK (reslock);
		688	size = res_queue.size;
		689	if (WORDACCESS_UNSAFE) UNLOCK (reslock);
		690
		691	if (size)
		692	return;
		693
		694	maybe_start_thread ();
		695
		696	FD_ZERO(&rfd);
		697	FD_SET(respipe [0], &rfd);
		698
		699	select (respipe [0] + 1, &rfd, 0, 0, 0);
		700	}
		701	}
		702
		703	static int poll_cb ()
		704	{
		705	dSP;
		706	int count = 0;
		707	int maxreqs = max_poll_reqs;
		708	int do_croak = 0;
		709	struct timeval tv_start, tv_now;
		710	aio_req req;
		711
		712	if (max_poll_time)
		713	gettimeofday (&tv_start, 0);
		714
		715	for (;;)
		716	{
		717	for (;;)
		718	{
		719	maybe_start_thread ();
		720
		721	LOCK (reslock);
		722	req = reqq_shift (&res_queue);
		723
		724	if (req)
		725	{
		726	--npending;
		727
		728	if (!res_queue.size)
		729	{
		730	/* read any signals sent by the worker threads */
		731	char buf [32];
		732	while (read (respipe [0], buf, 32) == 32)
		733	;
		734	}
		735	}
		736
		737	UNLOCK (reslock);
		738
		739	if (!req)
		740	break;
		741
		742	--nreqs;
		743
		744	if (req->type == REQ_GROUP && req->size)
		745	{
		746	req->int1 = 1; /* mark request as delayed */
		747	continue;
		748	}
		749	else
		750	{
		751	req_invoke (req);
		752
		753	count++;
		754	}
		755
		756	req_free (req);
		757
		758	if (maxreqs && !--maxreqs)
		759	break;
		760
		761	if (max_poll_time)
		762	{
		763	gettimeofday (&tv_now, 0);
		764
		765	if (tvdiff (&tv_start, &tv_now) >= max_poll_time)
		766	break;
		767	}
		768	}
		769
		770	if (nreqs <= max_outstanding)
		771	break;
		772
230	poll_wait ();	773	poll_wait ();
231	poll_cb ();	774
		775	++maxreqs;
232	}	776	}
233	}
234		777
235	static void	778	return count;
236	end_thread (void)
237	{
238	aio_req req;
239	New (0, req, 1, aio_cb);
240	req->type = REQ_QUIT;
241
242	send_req (req);
243	}	779	}
244		780
245		781	static void create_pipe ()
246	static void min_parallel (int nthreads)
247	{	782	{
248	while (nthreads > started)	783	if (pipe (respipe))
249	start_thread ();	784	croak ("unable to initialize result pipe");
250	}
251		785
252	static void max_parallel (int nthreads)	786	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
253	{	787	croak ("cannot set result pipe to nonblocking mode");
254	int cur = started;
255	while (cur > nthreads)
256	{
257	end_thread ();
258	cur--;
259	}
260		788
261	while (started > nthreads)	789	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
262	{	790	croak ("cannot set result pipe to nonblocking mode");
263	poll_wait ();
264	poll_cb ();
265	}
266	}	791	}
267
268	static int fork_started;
269
270	static void atfork_prepare (void)
271	{
272	int nstarted;
273
274	for (;;) {
275	while (nreqs)
276	{
277	poll_wait ();
278	poll_cb ();
279	}
280
281	nstarted = started;
282	max_parallel (0);
283
284	pthread_mutex_lock (&reqlock);
285
286	if (!nreqs && !started)
287	break;
288
289	pthread_mutex_unlock (&reqlock);
290
291	min_parallel (fork_started);
292	}
293
294	pthread_mutex_lock (&frklock);
295	fork_started = nstarted;
296	pthread_mutex_lock (&reslock);
297
298	assert (!started);
299	assert (!nreqs);
300	assert (!reqs && !reqe);
301	assert (!ress && !rese);
302	}
303
304	static void atfork_parent (void)
305	{
306	pthread_mutex_unlock (&reslock);
307	pthread_mutex_unlock (&frklock);
308	pthread_mutex_unlock (&reqlock);
309
310	min_parallel (fork_started);
311	}
312
313	#define atfork_child atfork_parent
314		792
315	/*****************************************************************************/	793	/*****************************************************************************/
316	/* work around various missing functions */	794	/* work around various missing functions */
317		795
318	#if !HAVE_PREADWRITE	796	#if !HAVE_PREADWRITE
…		…
322	/*	800	/*
323	* make our pread/pwrite safe against themselves, but not against	801	* make our pread/pwrite safe against themselves, but not against
324	* normal read/write by using a mutex. slows down execution a lot,	802	* normal read/write by using a mutex. slows down execution a lot,
325	* but that's your problem, not mine.	803	* but that's your problem, not mine.
326	*/	804	*/
327	static pthread_mutex_t iolock = PTHREAD_MUTEX_INITIALIZER;	805	static pthread_mutex_t preadwritelock = PTHREAD_MUTEX_INITIALIZER;
328		806
329	static ssize_t	807	static ssize_t pread (int fd, void *buf, size_t count, off_t offset)
330	pread (int fd, void *buf, size_t count, off_t offset)
331	{	808	{
332	ssize_t res;	809	ssize_t res;
333	off_t ooffset;	810	off_t ooffset;
334		811
335	pthread_mutex_lock (&iolock);	812	LOCK (preadwritelock);
336	ooffset = lseek (fd, 0, SEEK_CUR);	813	ooffset = lseek (fd, 0, SEEK_CUR);
337	lseek (fd, offset, SEEK_SET);	814	lseek (fd, offset, SEEK_SET);
338	res = read (fd, buf, count);	815	res = read (fd, buf, count);
339	lseek (fd, ooffset, SEEK_SET);	816	lseek (fd, ooffset, SEEK_SET);
340	pthread_mutex_unlock (&iolock);	817	UNLOCK (preadwritelock);
341		818
342	return res;	819	return res;
343	}	820	}
344		821
345	static ssize_t
346	pwrite (int fd, void *buf, size_t count, off_t offset)	822	static ssize_t pwrite (int fd, void *buf, size_t count, off_t offset)
347	{	823	{
348	ssize_t res;	824	ssize_t res;
349	off_t ooffset;	825	off_t ooffset;
350		826
351	pthread_mutex_lock (&iolock);	827	LOCK (preadwritelock);
352	ooffset = lseek (fd, 0, SEEK_CUR);	828	ooffset = lseek (fd, 0, SEEK_CUR);
353	lseek (fd, offset, SEEK_SET);	829	lseek (fd, offset, SEEK_SET);
354	res = write (fd, buf, count);	830	res = write (fd, buf, count);
355	lseek (fd, offset, SEEK_SET);	831	lseek (fd, offset, SEEK_SET);
356	pthread_mutex_unlock (&iolock);	832	UNLOCK (preadwritelock);
357		833
358	return res;	834	return res;
359	}	835	}
360	#endif	836	#endif
361		837
362	#if !HAVE_FDATASYNC	838	#if !HAVE_FDATASYNC
363	# define fdatasync fsync	839	# define fdatasync fsync
364	#endif	840	#endif
365		841
366	#if !HAVE_READAHEAD	842	#if !HAVE_READAHEAD
367	# define readahead aio_readahead	843	# define readahead(fd,offset,count) aio_readahead (fd, offset, count, self)
368		844
369	static char readahead_buf[4096];	845	static ssize_t aio_readahead (int fd, off_t offset, size_t count, worker *self)
370
371	static ssize_t
372	readahead (int fd, off_t offset, size_t count)
373	{	846	{
		847	dBUF;
		848
374	while (count > 0)	849	while (count > 0)
375	{	850	{
376	size_t len = count < sizeof (readahead_buf) ? count : sizeof (readahead_buf);	851	size_t len = count < AIO_BUFSIZE ? count : AIO_BUFSIZE;
377		852
378	pread (fd, readahead_buf, len, offset);	853	pread (fd, aio_buf, len, offset);
379	offset += len;	854	offset += len;
380	count -= len;	855	count -= len;
381	}	856	}
382		857
383	errno = 0;	858	errno = 0;
384	}	859	}
		860
385	#endif	861	#endif
386		862
		863	#if !HAVE_READDIR_R
		864	# define readdir_r aio_readdir_r
		865
		866	static pthread_mutex_t readdirlock = PTHREAD_MUTEX_INITIALIZER;
		867
		868	static int readdir_r (DIR *dirp, struct dirent *ent, struct dirent **res)
		869	{
		870	struct dirent *e;
		871	int errorno;
		872
		873	LOCK (readdirlock);
		874
		875	e = readdir (dirp);
		876	errorno = errno;
		877
		878	if (e)
		879	{
		880	*res = ent;
		881	strcpy (ent->d_name, e->d_name);
		882	}
		883	else
		884	*res = 0;
		885
		886	UNLOCK (readdirlock);
		887
		888	errno = errorno;
		889	return e ? 0 : -1;
		890	}
		891	#endif
		892
		893	/* sendfile always needs emulation */
		894	static ssize_t sendfile_ (int ofd, int ifd, off_t offset, size_t count, worker *self)
		895	{
		896	ssize_t res;
		897
		898	if (!count)
		899	return 0;
		900
		901	#if HAVE_SENDFILE
		902	# if __linux
		903	res = sendfile (ofd, ifd, &offset, count);
		904
		905	# elif __freebsd
		906	/*
		907	* Of course, the freebsd sendfile is a dire hack with no thoughts
		908	* wasted on making it similar to other I/O functions.
		909	*/
		910	{
		911	off_t sbytes;
		912	res = sendfile (ifd, ofd, offset, count, 0, &sbytes, 0);
		913
		914	if (res < 0 && sbytes)
		915	/* maybe only on EAGAIN: as usual, the manpage leaves you guessing */
		916	res = sbytes;
		917	}
		918
		919	# elif __hpux
		920	res = sendfile (ofd, ifd, offset, count, 0, 0);
		921
		922	# elif __solaris
		923	{
		924	struct sendfilevec vec;
		925	size_t sbytes;
		926
		927	vec.sfv_fd = ifd;
		928	vec.sfv_flag = 0;
		929	vec.sfv_off = offset;
		930	vec.sfv_len = count;
		931
		932	res = sendfilev (ofd, &vec, 1, &sbytes);
		933
		934	if (res < 0 && sbytes)
		935	res = sbytes;
		936	}
		937
		938	# endif
		939	#else
		940	res = -1;
		941	errno = ENOSYS;
		942	#endif
		943
		944	if (res < 0
		945	&& (errno == ENOSYS || errno == EINVAL || errno == ENOTSOCK
		946	#if __solaris
		947	|| errno == EAFNOSUPPORT || errno == EPROTOTYPE
		948	#endif
		949	)
		950	)
		951	{
		952	/* emulate sendfile. this is a major pain in the ass */
		953	dBUF;
		954
		955	res = 0;
		956
		957	while (count)
		958	{
		959	ssize_t cnt;
		960
		961	cnt = pread (ifd, aio_buf, count > AIO_BUFSIZE ? AIO_BUFSIZE : count, offset);
		962
		963	if (cnt <= 0)
		964	{
		965	if (cnt && !res) res = -1;
		966	break;
		967	}
		968
		969	cnt = write (ofd, aio_buf, cnt);
		970
		971	if (cnt <= 0)
		972	{
		973	if (cnt && !res) res = -1;
		974	break;
		975	}
		976
		977	offset += cnt;
		978	res += cnt;
		979	count -= cnt;
		980	}
		981	}
		982
		983	return res;
		984	}
		985
		986	/* read a full directory */
		987	static void scandir_ (aio_req req, worker *self)
		988	{
		989	DIR *dirp;
		990	union
		991	{
		992	struct dirent d;
		993	char b [offsetof (struct dirent, d_name) + NAME_MAX + 1];
		994	} *u;
		995	struct dirent *entp;
		996	char *name, *names;
		997	int memlen = 4096;
		998	int memofs = 0;
		999	int res = 0;
		1000	int errorno;
		1001
		1002	LOCK (wrklock);
		1003	self->dirp = dirp = opendir (req->ptr1);
		1004	self->dbuf = u = malloc (sizeof (*u));
		1005	req->flags |= FLAG_PTR2_FREE;
		1006	req->ptr2 = names = malloc (memlen);
		1007	UNLOCK (wrklock);
		1008
		1009	if (dirp && u && names)
		1010	for (;;)
		1011	{
		1012	errno = 0;
		1013	readdir_r (dirp, &u->d, &entp);
		1014
		1015	if (!entp)
		1016	break;
		1017
		1018	name = entp->d_name;
		1019
		1020	if (name [0] != '.' || (name [1] && (name [1] != '.' || name [2])))
		1021	{
		1022	int len = strlen (name) + 1;
		1023
		1024	res++;
		1025
		1026	while (memofs + len > memlen)
		1027	{
		1028	memlen *= 2;
		1029	LOCK (wrklock);
		1030	req->ptr2 = names = realloc (names, memlen);
		1031	UNLOCK (wrklock);
		1032
		1033	if (!names)
		1034	break;
		1035	}
		1036
		1037	memcpy (names + memofs, name, len);
		1038	memofs += len;
		1039	}
		1040	}
		1041
		1042	if (errno)
		1043	res = -1;
		1044
		1045	req->result = res;
		1046	}
		1047
387	/*****************************************************************************/	1048	/*****************************************************************************/
388		1049
389	static void *
390	aio_proc (void *thr_arg)	1050	static void *aio_proc (void *thr_arg)
391	{	1051	{
392	aio_req req;	1052	aio_req req;
393	int type;	1053	struct timespec ts;
		1054	worker *self = (worker *)thr_arg;
394		1055
395	do	1056	/* try to distribute timeouts somewhat evenly */
		1057	ts.tv_nsec = (((unsigned long)self + (unsigned long)ts.tv_sec) & 1023UL)
		1058	* (1000000000UL / 1024UL);
		1059
		1060	for (;;)
396	{	1061	{
397	pthread_mutex_lock (&reqlock);	1062	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1063
		1064	LOCK (reqlock);
398		1065
399	for (;;)	1066	for (;;)
400	{	1067	{
401	req = reqs;	1068	self->req = req = reqq_shift (&req_queue);
402
403	if (reqs)
404	{
405	reqs = reqs->next;
406	if (!reqs) reqe = 0;
407	}
408		1069
409	if (req)	1070	if (req)
410	break;	1071	break;
411		1072
		1073	++idle;
		1074
		1075	if (pthread_cond_timedwait (&reqwait, &reqlock, &ts)
		1076	== ETIMEDOUT)
		1077	{
		1078	if (idle > max_idle)
		1079	{
		1080	--idle;
		1081	UNLOCK (reqlock);
		1082	LOCK (wrklock);
		1083	--started;
		1084	UNLOCK (wrklock);
		1085	goto quit;
		1086	}
		1087
		1088	/* we are allowed to idle, so do so without any timeout */
412	pthread_cond_wait (&reqwait, &reqlock);	1089	pthread_cond_wait (&reqwait, &reqlock);
		1090	ts.tv_sec = time (0) + IDLE_TIMEOUT;
		1091	}
		1092
		1093	--idle;
413	}	1094	}
414		1095
415	pthread_mutex_unlock (&reqlock);	1096	--nready;
		1097
		1098	UNLOCK (reqlock);
416		1099
417	errno = 0; /* strictly unnecessary */	1100	errno = 0; /* strictly unnecessary */
418		1101
419	type = req->type;	1102	if (!(req->flags & FLAG_CANCELLED))
420
421	switch (type)	1103	switch (req->type)
422	{	1104	{
423	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;	1105	case REQ_READ: req->result = pread (req->int1, req->ptr1, req->size, req->offs); break;
424	case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;	1106	case REQ_WRITE: req->result = pwrite (req->int1, req->ptr1, req->size, req->offs); break;
425		1107
426	case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;	1108	case REQ_READAHEAD: req->result = readahead (req->int1, req->offs, req->size); break;
		1109	case REQ_SENDFILE: req->result = sendfile_ (req->int1, req->int2, req->offs, req->size, self); break;
427		1110
428	case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;	1111	case REQ_STAT: req->result = stat (req->ptr1, (Stat_t *)req->ptr2); break;
429	case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;	1112	case REQ_LSTAT: req->result = lstat (req->ptr1, (Stat_t *)req->ptr2); break;
430	case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;	1113	case REQ_FSTAT: req->result = fstat (req->int1, (Stat_t *)req->ptr2); break;
431		1114
432	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;	1115	case REQ_OPEN: req->result = open (req->ptr1, req->int1, req->mode); break;
433	case REQ_CLOSE: req->result = close (req->fd); break;	1116	case REQ_CLOSE: req->result = close (req->int1); break;
434	case REQ_UNLINK: req->result = unlink (req->dataptr); break;	1117	case REQ_UNLINK: req->result = unlink (req->ptr1); break;
435	case REQ_RMDIR: req->result = rmdir (req->dataptr); break;	1118	case REQ_RMDIR: req->result = rmdir (req->ptr1); 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;
436	case REQ_SYMLINK: req->result = symlink (req->data2ptr, req->dataptr); 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;
437		1124
438	case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;	1125	case REQ_FDATASYNC: req->result = fdatasync (req->int1); break;
439	case REQ_FSYNC: req->result = fsync (req->fd); break;	1126	case REQ_FSYNC: req->result = fsync (req->int1); break;
		1127	case REQ_READDIR: scandir_ (req, self); break;
440		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
441	case REQ_QUIT:	1143	case REQ_QUIT:
442	break;	1144	goto quit;
443		1145
444	default:	1146	default:
445	req->result = ENOSYS;	1147	req->result = ENOSYS;
446	break;	1148	break;
447	}	1149	}
448		1150
449	req->errorno = errno;	1151	req->errorno = errno;
450		1152
451	pthread_mutex_lock (&reslock);	1153	LOCK (reslock);
452		1154
453	req->next = 0;	1155	++npending;
454		1156
455	if (rese)	1157	if (!reqq_push (&res_queue, req))
456	{
457	rese->next = req;
458	rese = req;
459	}
460	else
461	{
462	rese = ress = req;
463
464	/* write a dummy byte to the pipe so fh becomes ready */	1158	/* write a dummy byte to the pipe so fh becomes ready */
465	write (respipe [1], &respipe, 1);	1159	write (respipe [1], &respipe, 1);
466	}
467		1160
468	pthread_mutex_unlock (&reslock);	1161	self->req = 0;
		1162	worker_clear (self);
		1163
		1164	UNLOCK (reslock);
469	}	1165	}
470	while (type != REQ_QUIT);	1166
		1167	quit:
		1168	LOCK (wrklock);
		1169	worker_free (self);
		1170	UNLOCK (wrklock);
471		1171
472	return 0;	1172	return 0;
		1173	}
		1174
		1175	/*****************************************************************************/
		1176
		1177	static void atfork_prepare (void)
		1178	{
		1179	LOCK (wrklock);
		1180	LOCK (reqlock);
		1181	LOCK (reslock);
		1182	#if !HAVE_PREADWRITE
		1183	LOCK (preadwritelock);
		1184	#endif
		1185	#if !HAVE_READDIR_R
		1186	LOCK (readdirlock);
		1187	#endif
		1188	}
		1189
		1190	static void atfork_parent (void)
		1191	{
		1192	#if !HAVE_READDIR_R
		1193	UNLOCK (readdirlock);
		1194	#endif
		1195	#if !HAVE_PREADWRITE
		1196	UNLOCK (preadwritelock);
		1197	#endif
		1198	UNLOCK (reslock);
		1199	UNLOCK (reqlock);
		1200	UNLOCK (wrklock);
		1201	}
		1202
		1203	static void atfork_child (void)
		1204	{
		1205	aio_req prv;
		1206
		1207	while (prv = reqq_shift (&req_queue))
		1208	req_free (prv);
		1209
		1210	while (prv = reqq_shift (&res_queue))
		1211	req_free (prv);
		1212
		1213	while (wrk_first.next != &wrk_first)
		1214	{
		1215	worker *wrk = wrk_first.next;
		1216
		1217	if (wrk->req)
		1218	req_free (wrk->req);
		1219
		1220	worker_clear (wrk);
		1221	worker_free (wrk);
		1222	}
		1223
		1224	started = 0;
		1225	idle = 0;
		1226	nreqs = 0;
		1227	nready = 0;
		1228	npending = 0;
		1229
		1230	close (respipe [0]);
		1231	close (respipe [1]);
		1232	create_pipe ();
		1233
		1234	atfork_parent ();
473	}	1235	}
474		1236
475	#define dREQ \	1237	#define dREQ \
476	aio_req req; \	1238	aio_req req; \
		1239	int req_pri = next_pri; \
		1240	next_pri = DEFAULT_PRI + PRI_BIAS; \
477	\	1241	\
478	if (SvOK (callback) && !SvROK (callback)) \	1242	if (SvOK (callback) && !SvROK (callback)) \
479	croak ("clalback must be undef or of reference type"); \	1243	croak ("callback must be undef or of reference type"); \
480	\	1244	\
481	Newz (0, req, 1, aio_cb); \	1245	Newz (0, req, 1, aio_cb); \
482	if (!req) \	1246	if (!req) \
483	croak ("out of memory during aio_req allocation"); \	1247	croak ("out of memory during aio_req allocation"); \
484	\	1248	\
485	req->callback = SvREFCNT_inc (callback);	1249	req->callback = newSVsv (callback); \
		1250	req->pri = req_pri
		1251
		1252	#define REQ_SEND \
		1253	req_send (req); \
		1254	\
		1255	if (GIMME_V != G_VOID) \
		1256	XPUSHs (req_sv (req, AIO_REQ_KLASS));
486		1257
487	MODULE = IO::AIO PACKAGE = IO::AIO	1258	MODULE = IO::AIO PACKAGE = IO::AIO
488		1259
489	PROTOTYPES: ENABLE	1260	PROTOTYPES: ENABLE
490		1261
491	BOOT:	1262	BOOT:
492	{	1263	{
493	if (pipe (respipe))	1264	HV *stash = gv_stashpv ("IO::AIO", 1);
494	croak ("unable to initialize result pipe");
495		1265
496	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))	1266	newCONSTSUB (stash, "EXDEV", newSViv (EXDEV));
497	croak ("cannot set result pipe to nonblocking mode");	1267	newCONSTSUB (stash, "O_RDONLY", newSViv (O_RDONLY));
		1268	newCONSTSUB (stash, "O_WRONLY", newSViv (O_WRONLY));
		1269	newCONSTSUB (stash, "O_CREAT", newSViv (O_CREAT));
		1270	newCONSTSUB (stash, "O_TRUNC", newSViv (O_TRUNC));
		1271	newCONSTSUB (stash, "S_IFIFO", newSViv (S_IFIFO));
498		1272
499	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))	1273	create_pipe ();
500	croak ("cannot set result pipe to nonblocking mode");
501
502	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);	1274	pthread_atfork (atfork_prepare, atfork_parent, atfork_child);
503	}	1275	}
504		1276
505	void	1277	void
506	min_parallel(nthreads)	1278	max_poll_reqs (int nreqs)
507	int nthreads
508	PROTOTYPE: $	1279	PROTOTYPE: $
		1280	CODE:
		1281	max_poll_reqs = nreqs;
509		1282
510	void	1283	void
511	max_parallel(nthreads)	1284	max_poll_time (double nseconds)
512	int nthreads
513	PROTOTYPE: $	1285	PROTOTYPE: $
		1286	CODE:
		1287	max_poll_time = nseconds * AIO_TICKS;
		1288
		1289	void
		1290	min_parallel (int nthreads)
		1291	PROTOTYPE: $
		1292
		1293	void
		1294	max_parallel (int nthreads)
		1295	PROTOTYPE: $
		1296
		1297	void
		1298	max_idle (int nthreads)
		1299	PROTOTYPE: $
		1300	CODE:
		1301	set_max_idle (nthreads);
514		1302
515	int	1303	int
516	max_outstanding(nreqs)	1304	max_outstanding (int maxreqs)
517	int nreqs	1305	PROTOTYPE: $
518	PROTOTYPE: $
519	CODE:	1306	CODE:
520	RETVAL = max_outstanding;	1307	RETVAL = max_outstanding;
521	max_outstanding = nreqs;	1308	max_outstanding = maxreqs;
		1309	OUTPUT:
		1310	RETVAL
522		1311
523	void	1312	void
524	aio_open(pathname,flags,mode,callback=&PL_sv_undef)	1313	aio_open (pathname,flags,mode,callback=&PL_sv_undef)
525	SV * pathname	1314	SV * pathname
526	int flags	1315	int flags
527	int mode	1316	int mode
528	SV * callback	1317	SV * callback
529	PROTOTYPE: $$$;$	1318	PROTOTYPE: $$$;$
530	CODE:	1319	PPCODE:
531	{	1320	{
532	dREQ;	1321	dREQ;
533		1322
534	req->type = REQ_OPEN;	1323	req->type = REQ_OPEN;
535	req->data = newSVsv (pathname);	1324	req->sv1 = newSVsv (pathname);
536	req->dataptr = SvPVbyte_nolen (req->data);	1325	req->ptr1 = SvPVbyte_nolen (pathname);
537	req->fd = flags;	1326	req->int1 = flags;
538	req->mode = mode;	1327	req->mode = mode;
539		1328
540	send_req (req);	1329	REQ_SEND;
541	}	1330	}
542		1331
543	void	1332	void
544	aio_close(fh,callback=&PL_sv_undef)	1333	aio_close (fh,callback=&PL_sv_undef)
545	SV * fh	1334	SV * fh
546	SV * callback	1335	SV * callback
547	PROTOTYPE: $;$	1336	PROTOTYPE: $;$
548	ALIAS:	1337	ALIAS:
549	aio_close = REQ_CLOSE	1338	aio_close = REQ_CLOSE
550	aio_fsync = REQ_FSYNC	1339	aio_fsync = REQ_FSYNC
551	aio_fdatasync = REQ_FDATASYNC	1340	aio_fdatasync = REQ_FDATASYNC
552	CODE:	1341	PPCODE:
553	{	1342	{
554	dREQ;	1343	dREQ;
555		1344
556	req->type = ix;	1345	req->type = ix;
557	req->fh = newSVsv (fh);	1346	req->fh = newSVsv (fh);
558	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1347	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
559		1348
560	send_req (req);	1349	REQ_SEND (req);
561	}	1350	}
562		1351
563	void	1352	void
564	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)	1353	aio_read (fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
565	SV * fh	1354	SV * fh
566	UV offset	1355	UV offset
567	IV length	1356	UV length
568	SV * data	1357	SV * data
569	IV dataoffset	1358	UV dataoffset
570	SV * callback	1359	SV * callback
571	ALIAS:	1360	ALIAS:
572	aio_read = REQ_READ	1361	aio_read = REQ_READ
573	aio_write = REQ_WRITE	1362	aio_write = REQ_WRITE
574	PROTOTYPE: $$$$$;$	1363	PROTOTYPE: $$$$$;$
575	CODE:	1364	PPCODE:
576	{	1365	{
577	aio_req req;
578	STRLEN svlen;	1366	STRLEN svlen;
579	char *svptr = SvPVbyte (data, svlen);	1367	char *svptr = SvPVbyte (data, svlen);
580		1368
581	SvUPGRADE (data, SVt_PV);	1369	SvUPGRADE (data, SVt_PV);
582	SvPOK_on (data);	1370	SvPOK_on (data);
…		…
604		1392
605	{	1393	{
606	dREQ;	1394	dREQ;
607		1395
608	req->type = ix;	1396	req->type = ix;
609	req->fh = newSVsv (fh);	1397	req->fh = newSVsv (fh);
610	req->fd = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))	1398	req->int1 = PerlIO_fileno (ix == REQ_READ ? IoIFP (sv_2io (fh))
611	: IoOFP (sv_2io (fh)));	1399	: IoOFP (sv_2io (fh)));
612	req->offset = offset;	1400	req->offs = offset;
613	req->length = length;	1401	req->size = length;
614	req->data = SvREFCNT_inc (data);	1402	req->sv1 = SvREFCNT_inc (data);
615	req->dataptr = (char *)svptr + dataoffset;	1403	req->ptr1 = (char *)svptr + dataoffset;
616	req->callback = SvREFCNT_inc (callback);	1404	req->stroffset = dataoffset;
617		1405
618	send_req (req);	1406	if (!SvREADONLY (data))
		1407	{
		1408	SvREADONLY_on (data);
		1409	req->flags |= FLAG_SV1_RO_OFF;
		1410	}
		1411
		1412	REQ_SEND;
619	}	1413	}
620	}	1414	}
621		1415
622	void	1416	void
		1417	aio_readlink (path,callback=&PL_sv_undef)
		1418	SV * path
		1419	SV * callback
		1420	PROTOTYPE: $$;$
		1421	PPCODE:
		1422	{
		1423	SV *data;
		1424	dREQ;
		1425
		1426	data = newSV (NAME_MAX);
		1427	SvPOK_on (data);
		1428
		1429	req->type = REQ_READLINK;
		1430	req->fh = newSVsv (path);
		1431	req->ptr2 = SvPVbyte_nolen (path);
		1432	req->sv1 = data;
		1433	req->ptr1 = SvPVbyte_nolen (data);
		1434
		1435	REQ_SEND;
		1436	}
		1437
		1438	void
		1439	aio_sendfile (out_fh,in_fh,in_offset,length,callback=&PL_sv_undef)
		1440	SV * out_fh
		1441	SV * in_fh
		1442	UV in_offset
		1443	UV length
		1444	SV * callback
		1445	PROTOTYPE: $$$$;$
		1446	PPCODE:
		1447	{
		1448	dREQ;
		1449
		1450	req->type = REQ_SENDFILE;
		1451	req->fh = newSVsv (out_fh);
		1452	req->int1 = PerlIO_fileno (IoIFP (sv_2io (out_fh)));
		1453	req->sv2 = newSVsv (in_fh);
		1454	req->int2 = PerlIO_fileno (IoIFP (sv_2io (in_fh)));
		1455	req->offs = in_offset;
		1456	req->size = length;
		1457
		1458	REQ_SEND;
		1459	}
		1460
		1461	void
623	aio_readahead(fh,offset,length,callback=&PL_sv_undef)	1462	aio_readahead (fh,offset,length,callback=&PL_sv_undef)
624	SV * fh	1463	SV * fh
625	UV offset	1464	UV offset
626	IV length	1465	IV length
627	SV * callback	1466	SV * callback
628	PROTOTYPE: $$$;$	1467	PROTOTYPE: $$$;$
629	CODE:	1468	PPCODE:
630	{	1469	{
631	dREQ;	1470	dREQ;
632		1471
633	req->type = REQ_READAHEAD;	1472	req->type = REQ_READAHEAD;
634	req->fh = newSVsv (fh);	1473	req->fh = newSVsv (fh);
635	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh)));	1474	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh)));
636	req->offset = offset;	1475	req->offs = offset;
637	req->length = length;	1476	req->size = length;
638		1477
639	send_req (req);	1478	REQ_SEND;
640	}	1479	}
641		1480
642	void	1481	void
643	aio_stat(fh_or_path,callback=&PL_sv_undef)	1482	aio_stat (fh_or_path,callback=&PL_sv_undef)
644	SV * fh_or_path	1483	SV * fh_or_path
645	SV * callback	1484	SV * callback
646	ALIAS:	1485	ALIAS:
647	aio_stat = REQ_STAT	1486	aio_stat = REQ_STAT
648	aio_lstat = REQ_LSTAT	1487	aio_lstat = REQ_LSTAT
649	CODE:	1488	PPCODE:
650	{	1489	{
651	dREQ;	1490	dREQ;
652		1491
653	New (0, req->statdata, 1, Stat_t);	1492	req->ptr2 = malloc (sizeof (Stat_t));
654	if (!req->statdata)	1493	if (!req->ptr2)
		1494	{
		1495	req_free (req);
655	croak ("out of memory during aio_req->statdata allocation (sorry, i just leaked memory, too)");	1496	croak ("out of memory during aio_req statdata allocation");
		1497	}
		1498
		1499	req->flags |= FLAG_PTR2_FREE;
656		1500
657	if (SvPOK (fh_or_path))	1501	if (SvPOK (fh_or_path))
658	{	1502	{
659	req->type = ix;	1503	req->type = ix;
660	req->data = newSVsv (fh_or_path);	1504	req->sv1 = newSVsv (fh_or_path);
661	req->dataptr = SvPVbyte_nolen (req->data);	1505	req->ptr1 = SvPVbyte_nolen (fh_or_path);
662	}	1506	}
663	else	1507	else
664	{	1508	{
665	req->type = REQ_FSTAT;	1509	req->type = REQ_FSTAT;
666	req->fh = newSVsv (fh_or_path);	1510	req->fh = newSVsv (fh_or_path);
667	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));	1511	req->int1 = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
668	}	1512	}
669		1513
670	send_req (req);	1514	REQ_SEND;
671	}	1515	}
672		1516
673	void	1517	void
674	aio_unlink(pathname,callback=&PL_sv_undef)	1518	aio_unlink (pathname,callback=&PL_sv_undef)
675	SV * pathname	1519	SV * pathname
676	SV * callback	1520	SV * callback
677	ALIAS:	1521	ALIAS:
678	aio_unlink = REQ_UNLINK	1522	aio_unlink = REQ_UNLINK
679	aio_rmdir = REQ_RMDIR	1523	aio_rmdir = REQ_RMDIR
		1524	aio_readdir = REQ_READDIR
680	CODE:	1525	PPCODE:
681	{	1526	{
682	dREQ;	1527	dREQ;
683		1528
684	req->type = ix;	1529	req->type = ix;
685	req->data = newSVsv (pathname);	1530	req->sv1 = newSVsv (pathname);
686	req->dataptr = SvPVbyte_nolen (req->data);	1531	req->ptr1 = SvPVbyte_nolen (pathname);
687
688	send_req (req);
689	}
690		1532
		1533	REQ_SEND;
		1534	}
		1535
691	void	1536	void
692	aio_symlink(oldpath,newpath,callback=&PL_sv_undef)	1537	aio_link (oldpath,newpath,callback=&PL_sv_undef)
693	SV * oldpath	1538	SV * oldpath
694	SV * newpath	1539	SV * newpath
695	SV * callback	1540	SV * callback
		1541	ALIAS:
		1542	aio_link = REQ_LINK
		1543	aio_symlink = REQ_SYMLINK
		1544	aio_rename = REQ_RENAME
696	CODE:	1545	PPCODE:
697	{	1546	{
698	dREQ;	1547	dREQ;
699		1548
700	req->type = REQ_SYMLINK;	1549	req->type = ix;
701	req->fh = newSVsv (oldpath);	1550	req->fh = newSVsv (oldpath);
702	req->data2ptr = SvPVbyte_nolen (req->fh);	1551	req->ptr2 = SvPVbyte_nolen (req->fh);
703	req->data = newSVsv (newpath);	1552	req->sv1 = newSVsv (newpath);
704	req->dataptr = SvPVbyte_nolen (req->data);	1553	req->ptr1 = SvPVbyte_nolen (newpath);
705		1554
706	send_req (req);	1555	REQ_SEND;
707	}	1556	}
708		1557
709	void	1558	void
		1559	aio_mknod (pathname,mode,dev,callback=&PL_sv_undef)
		1560	SV * pathname
		1561	SV * callback
		1562	UV mode
		1563	UV dev
		1564	PPCODE:
		1565	{
		1566	dREQ;
		1567
		1568	req->type = REQ_MKNOD;
		1569	req->sv1 = newSVsv (pathname);
		1570	req->ptr1 = SvPVbyte_nolen (pathname);
		1571	req->mode = (mode_t)mode;
		1572	req->offs = dev;
		1573
		1574	REQ_SEND;
		1575	}
		1576
		1577	void
		1578	aio_busy (delay,callback=&PL_sv_undef)
		1579	double delay
		1580	SV * callback
		1581	PPCODE:
		1582	{
		1583	dREQ;
		1584
		1585	req->type = REQ_BUSY;
		1586	req->int1 = delay < 0. ? 0 : delay;
		1587	req->int2 = delay < 0. ? 0 : 1000. * (delay - req->int1);
		1588
		1589	REQ_SEND;
		1590	}
		1591
		1592	void
		1593	aio_group (callback=&PL_sv_undef)
		1594	SV * callback
		1595	PROTOTYPE: ;$
		1596	PPCODE:
		1597	{
		1598	dREQ;
		1599
		1600	req->type = REQ_GROUP;
		1601
		1602	req_send (req);
		1603	XPUSHs (req_sv (req, AIO_GRP_KLASS));
		1604	}
		1605
		1606	void
		1607	aio_nop (callback=&PL_sv_undef)
		1608	SV * callback
		1609	PPCODE:
		1610	{
		1611	dREQ;
		1612
		1613	req->type = REQ_NOP;
		1614
		1615	REQ_SEND;
		1616	}
		1617
		1618	int
		1619	aioreq_pri (int pri = 0)
		1620	PROTOTYPE: ;$
		1621	CODE:
		1622	RETVAL = next_pri - PRI_BIAS;
		1623	if (items > 0)
		1624	{
		1625	if (pri < PRI_MIN) pri = PRI_MIN;
		1626	if (pri > PRI_MAX) pri = PRI_MAX;
		1627	next_pri = pri + PRI_BIAS;
		1628	}
		1629	OUTPUT:
		1630	RETVAL
		1631
		1632	void
		1633	aioreq_nice (int nice = 0)
		1634	CODE:
		1635	nice = next_pri - nice;
		1636	if (nice < PRI_MIN) nice = PRI_MIN;
		1637	if (nice > PRI_MAX) nice = PRI_MAX;
		1638	next_pri = nice + PRI_BIAS;
		1639
		1640	void
710	flush()	1641	flush ()
711	PROTOTYPE:	1642	PROTOTYPE:
712	CODE:	1643	CODE:
713	while (nreqs)	1644	while (nreqs)
714	{	1645	{
715	poll_wait ();	1646	poll_wait ();
716	poll_cb ();	1647	poll_cb (0);
717	}	1648	}
718		1649
719	void	1650	void
720	poll()	1651	poll()
721	PROTOTYPE:	1652	PROTOTYPE:
722	CODE:	1653	CODE:
723	if (nreqs)	1654	if (nreqs)
724	{	1655	{
725	poll_wait ();	1656	poll_wait ();
726	poll_cb ();	1657	poll_cb (0);
727	}	1658	}
728		1659
729	int	1660	int
730	poll_fileno()	1661	poll_fileno()
731	PROTOTYPE:	1662	PROTOTYPE:
…		…
755	CODE:	1686	CODE:
756	RETVAL = nreqs;	1687	RETVAL = nreqs;
757	OUTPUT:	1688	OUTPUT:
758	RETVAL	1689	RETVAL
759		1690
		1691	int
		1692	nready()
		1693	PROTOTYPE:
		1694	CODE:
		1695	RETVAL = get_nready ();
		1696	OUTPUT:
		1697	RETVAL
		1698
		1699	int
		1700	npending()
		1701	PROTOTYPE:
		1702	CODE:
		1703	RETVAL = get_npending ();
		1704	OUTPUT:
		1705	RETVAL
		1706
		1707	int
		1708	nthreads()
		1709	PROTOTYPE:
		1710	CODE:
		1711	if (WORDACCESS_UNSAFE) LOCK (wrklock);
		1712	RETVAL = started;
		1713	if (WORDACCESS_UNSAFE) UNLOCK (wrklock);
		1714	OUTPUT:
		1715	RETVAL
		1716
		1717	PROTOTYPES: DISABLE
		1718
		1719	MODULE = IO::AIO PACKAGE = IO::AIO::REQ
		1720
		1721	void
		1722	cancel (aio_req_ornot req)
		1723	CODE:
		1724	req_cancel (req);
		1725
		1726	void
		1727	cb (aio_req_ornot req, SV *callback=&PL_sv_undef)
		1728	CODE:
		1729	SvREFCNT_dec (req->callback);
		1730	req->callback = newSVsv (callback);
		1731
		1732	MODULE = IO::AIO PACKAGE = IO::AIO::GRP
		1733
		1734	void
		1735	add (aio_req grp, ...)
		1736	PPCODE:
		1737	{
		1738	int i;
		1739	aio_req req;
		1740
		1741	if (grp->int1 == 2)
		1742	croak ("cannot add requests to IO::AIO::GRP after the group finished");
		1743
		1744	for (i = 1; i < items; ++i )
		1745	{
		1746	if (GIMME_V != G_VOID)
		1747	XPUSHs (sv_2mortal (newSVsv (ST (i))));
		1748
		1749	req = SvAIO_REQ (ST (i));
		1750
		1751	if (req)
		1752	{
		1753	++grp->size;
		1754	req->grp = grp;
		1755
		1756	req->grp_prev = 0;
		1757	req->grp_next = grp->grp_first;
		1758
		1759	if (grp->grp_first)
		1760	grp->grp_first->grp_prev = req;
		1761
		1762	grp->grp_first = req;
		1763	}
		1764	}
		1765	}
		1766
		1767	void
		1768	cancel_subs (aio_req_ornot req)
		1769	CODE:
		1770	req_cancel_subs (req);
		1771
		1772	void
		1773	result (aio_req grp, ...)
		1774	CODE:
		1775	{
		1776	int i;
		1777	AV *av;
		1778
		1779	grp->errorno = errno;
		1780
		1781	av = newAV ();
		1782
		1783	for (i = 1; i < items; ++i )
		1784	av_push (av, newSVsv (ST (i)));
		1785
		1786	SvREFCNT_dec (grp->sv1);
		1787	grp->sv1 = (SV *)av;
		1788	}
		1789
		1790	void
		1791	errno (aio_req grp, int errorno = errno)
		1792	CODE:
		1793	grp->errorno = errorno;
		1794
		1795	void
		1796	limit (aio_req grp, int limit)
		1797	CODE:
		1798	grp->int2 = limit;
		1799	aio_grp_feed (grp);
		1800
		1801	void
		1802	feed (aio_req grp, SV *callback=&PL_sv_undef)
		1803	CODE:
		1804	{
		1805	SvREFCNT_dec (grp->sv2);
		1806	grp->sv2 = newSVsv (callback);
		1807
		1808	if (grp->int2 <= 0)
		1809	grp->int2 = 2;
		1810
		1811	aio_grp_feed (grp);
		1812	}
		1813

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