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Comparing libev/ev.c (file contents):
Revision 1.4 by root, Tue Oct 30 23:10:33 2007 UTC vs.
Revision 1.76 by root, Wed Nov 7 18:47:26 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#ifndef EV_STANDALONE
		32	# include "config.h"
		33
		34	# if HAVE_CLOCK_GETTIME
		35	# define EV_USE_MONOTONIC 1
		36	# define EV_USE_REALTIME 1
		37	# endif
		38
		39	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		40	# define EV_USE_SELECT 1
		41	# endif
		42
		43	# if HAVE_POLL && HAVE_POLL_H
		44	# define EV_USE_POLL 1
		45	# endif
		46
		47	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		48	# define EV_USE_EPOLL 1
		49	# endif
		50
		51	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		52	# define EV_USE_KQUEUE 1
		53	# endif
		54
		55	#endif
		56
1	#include <math.h>	57	#include <math.h>
2	#include <stdlib.h>	58	#include <stdlib.h>
		59	#include <fcntl.h>
		60	#include <stddef.h>
3		61
4	#include <stdio.h>	62	#include <stdio.h>
5		63
6	#include <assert.h>	64	#include <assert.h>
7	#include <errno.h>	65	#include <errno.h>
8	#include <sys/time.h>	66	#include <sys/types.h>
9	#include <time.h>	67	#include <time.h>
10		68
		69	#include <signal.h>
		70
		71	#ifndef WIN32
		72	# include <unistd.h>
		73	# include <sys/time.h>
		74	# include <sys/wait.h>
		75	#endif
		76	/**/
		77
		78	#ifndef EV_USE_MONOTONIC
		79	# define EV_USE_MONOTONIC 1
		80	#endif
		81
		82	#ifndef EV_USE_SELECT
		83	# define EV_USE_SELECT 1
		84	#endif
		85
		86	#ifndef EV_USE_POLL
		87	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		88	#endif
		89
		90	#ifndef EV_USE_EPOLL
		91	# define EV_USE_EPOLL 0
		92	#endif
		93
		94	#ifndef EV_USE_KQUEUE
		95	# define EV_USE_KQUEUE 0
		96	#endif
		97
		98	#ifndef EV_USE_WIN32
		99	# ifdef WIN32
		100	# define EV_USE_WIN32 0 /* it does not exist, use select */
		101	# undef EV_USE_SELECT
		102	# define EV_USE_SELECT 1
		103	# else
		104	# define EV_USE_WIN32 0
		105	# endif
		106	#endif
		107
		108	#ifndef EV_USE_REALTIME
		109	# define EV_USE_REALTIME 1
		110	#endif
		111
		112	/**/
		113
11	#ifdef CLOCK_MONOTONIC	114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	116	# define EV_USE_MONOTONIC 0
13	#endif	117	#endif
14		118
15	#define HAVE_EPOLL 1	119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
16	#define HAVE_REALTIME 1	121	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 0	122	#endif
		123
		124	/**/
18		125
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	126	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	127	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		128	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		129	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
21		130
22	#include "ev.h"	131	#include "ev.h"
23		132
		133	#if __GNUC__ >= 3
		134	# define expect(expr,value) __builtin_expect ((expr),(value))
		135	# define inline inline
		136	#else
		137	# define expect(expr,value) (expr)
		138	# define inline static
		139	#endif
		140
		141	#define expect_false(expr) expect ((expr) != 0, 0)
		142	#define expect_true(expr) expect ((expr) != 0, 1)
		143
		144	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		145	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		146
24	struct ev_watcher {	147	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);	148	typedef struct ev_watcher_list *WL;
		149	typedef struct ev_watcher_time *WT;
		150
		151	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		152
		153	#include "ev_win32.c"
		154
		155	/*****************************************************************************/
		156
		157	static void (*syserr_cb)(const char *msg);
		158
		159	void ev_set_syserr_cb (void (*cb)(const char *msg))
		160	{
		161	syserr_cb = cb;
		162	}
		163
		164	static void
		165	syserr (const char *msg)
		166	{
		167	if (!msg)
		168	msg = "(libev) system error";
		169
		170	if (syserr_cb)
		171	syserr_cb (msg);
		172	else
		173	{
		174	perror (msg);
		175	abort ();
		176	}
		177	}
		178
		179	static void *(*alloc)(void *ptr, long size);
		180
		181	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		182	{
		183	alloc = cb;
		184	}
		185
		186	static void *
		187	ev_realloc (void *ptr, long size)
		188	{
		189	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		190
		191	if (!ptr && size)
		192	{
		193	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		194	abort ();
		195	}
		196
		197	return ptr;
		198	}
		199
		200	#define ev_malloc(size) ev_realloc (0, (size))
		201	#define ev_free(ptr) ev_realloc ((ptr), 0)
		202
		203	/*****************************************************************************/
		204
		205	typedef struct
		206	{
		207	WL head;
		208	unsigned char events;
		209	unsigned char reify;
		210	} ANFD;
		211
		212	typedef struct
		213	{
		214	W w;
		215	int events;
		216	} ANPENDING;
		217
		218	#if EV_MULTIPLICITY
		219
		220	struct ev_loop
		221	{
		222	# define VAR(name,decl) decl;
		223	# include "ev_vars.h"
26	};	224	};
		225	# undef VAR
		226	# include "ev_wrap.h"
27		227
28	struct ev_watcher_list {	228	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		229
32	static ev_tstamp now, diff; /* monotonic clock */	230	# define VAR(name,decl) static decl;
33	ev_tstamp ev_now;	231	# include "ev_vars.h"
34	int ev_method;	232	# undef VAR
35		233
36	static int have_monotonic; /* runtime */	234	#endif
37		235
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	236	/*****************************************************************************/
39	static void (*method_reify)(void);
40	static void (*method_poll)(ev_tstamp timeout);
41		237
42	ev_tstamp	238	inline ev_tstamp
43	ev_time (void)	239	ev_time (void)
44	{	240	{
45	#if HAVE_REALTIME	241	#if EV_USE_REALTIME
46	struct timespec ts;	242	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	243	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	244	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	245	#else
50	struct timeval tv;	246	struct timeval tv;
51	gettimeofday (&tv, 0);	247	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	248	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	249	#endif
54	}	250	}
55		251
56	static ev_tstamp	252	inline ev_tstamp
57	get_clock (void)	253	get_clock (void)
58	{	254	{
59	#if HAVE_MONOTONIC	255	#if EV_USE_MONOTONIC
60	if (have_monotonic)	256	if (expect_true (have_monotonic))
61	{	257	{
62	struct timespec ts;	258	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	259	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	260	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	261	}
66	#endif	262	#endif
67		263
68	return ev_time ();	264	return ev_time ();
69	}	265	}
70		266
		267	ev_tstamp
		268	ev_now (EV_P)
		269	{
		270	return rt_now;
		271	}
		272
		273	#define array_roundsize(type,n) ((n) | 4 & ~3)
		274
71	#define array_needsize(base,cur,cnt,init) \	275	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	276	if (expect_false ((cnt) > cur)) \
73	{ \	277	{ \
74	int newcnt = cur ? cur << 1 : 16; \	278	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	279	do \
		280	{ \
		281	newcnt = array_roundsize (type, newcnt << 1); \
		282	} \
		283	while ((cnt) > newcnt); \
		284	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	285	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
77	init (base + cur, newcnt - cur); \	286	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	287	cur = newcnt; \
79	}	288	}
80		289
81	typedef struct	290	#define array_slim(type,stem) \
82	{	291	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	292	{ \
84	unsigned char wev, rev; /* want, received event set */	293	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	294	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		295	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		296	}
86		297
87	static ANFD *anfds;	298	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
88	static int anfdmax;	299	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		300	#define array_free_microshit(stem) \
		301	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
89		302
90	static int *fdchanges;	303	#define array_free(stem, idx) \
91	static int fdchangemax, fdchangecnt;	304	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		305
		306	/*****************************************************************************/
92		307
93	static void	308	static void
94	anfds_init (ANFD *base, int count)	309	anfds_init (ANFD *base, int count)
95	{	310	{
96	while (count--)	311	while (count--)
97	{	312	{
98	base->head = 0;	313	base->head = 0;
99	base->wev = base->rev = EV_NONE;	314	base->events = EV_NONE;
		315	base->reify = 0;
		316
100	++base;	317	++base;
101	}	318	}
102	}	319	}
103		320
104	typedef struct
105	{
106	struct ev_watcher *w;
107	int events;
108	} ANPENDING;
109
110	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;
112
113	static void	321	static void
114	event (struct ev_watcher *w, int events)	322	event (EV_P_ W w, int events)
115	{	323	{
		324	if (w->pending)
		325	{
		326	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		327	return;
		328	}
		329
116	w->pending = ++pendingcnt;	330	w->pending = ++pendingcnt [ABSPRI (w)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	331	array_needsize (ANPENDING, pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], (void));
118	pendings [pendingcnt - 1].w = w;	332	pendings [ABSPRI (w)][w->pending - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	333	pendings [ABSPRI (w)][w->pending - 1].events = events;
120	}	334	}
121		335
122	static void	336	static void
		337	queue_events (EV_P_ W *events, int eventcnt, int type)
		338	{
		339	int i;
		340
		341	for (i = 0; i < eventcnt; ++i)
		342	event (EV_A_ events [i], type);
		343	}
		344
		345	static void
123	fd_event (int fd, int events)	346	fd_event (EV_P_ int fd, int events)
124	{	347	{
125	ANFD *anfd = anfds + fd;	348	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	349	struct ev_io *w;
127		350
128	for (w = anfd->head; w; w = w->next)	351	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	352	{
130	int ev = w->events & events;	353	int ev = w->events & events;
131		354
132	if (ev)	355	if (ev)
133	event ((struct ev_watcher *)w, ev);	356	event (EV_A_ (W)w, ev);
		357	}
		358	}
		359
		360	/*****************************************************************************/
		361
		362	static void
		363	fd_reify (EV_P)
		364	{
		365	int i;
		366
		367	for (i = 0; i < fdchangecnt; ++i)
		368	{
		369	int fd = fdchanges [i];
		370	ANFD *anfd = anfds + fd;
		371	struct ev_io *w;
		372
		373	int events = 0;
		374
		375	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		376	events |= w->events;
		377
		378	anfd->reify = 0;
		379
		380	method_modify (EV_A_ fd, anfd->events, events);
		381	anfd->events = events;
		382	}
		383
		384	fdchangecnt = 0;
		385	}
		386
		387	static void
		388	fd_change (EV_P_ int fd)
		389	{
		390	if (anfds [fd].reify)
		391	return;
		392
		393	anfds [fd].reify = 1;
		394
		395	++fdchangecnt;
		396	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		397	fdchanges [fdchangecnt - 1] = fd;
		398	}
		399
		400	static void
		401	fd_kill (EV_P_ int fd)
		402	{
		403	struct ev_io *w;
		404
		405	while ((w = (struct ev_io *)anfds [fd].head))
		406	{
		407	ev_io_stop (EV_A_ w);
		408	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		409	}
		410	}
		411
		412	static int
		413	fd_valid (int fd)
		414	{
		415	#ifdef WIN32
		416	return !!win32_get_osfhandle (fd);
		417	#else
		418	return fcntl (fd, F_GETFD) != -1;
		419	#endif
		420	}
		421
		422	/* called on EBADF to verify fds */
		423	static void
		424	fd_ebadf (EV_P)
		425	{
		426	int fd;
		427
		428	for (fd = 0; fd < anfdmax; ++fd)
		429	if (anfds [fd].events)
		430	if (!fd_valid (fd) == -1 && errno == EBADF)
		431	fd_kill (EV_A_ fd);
		432	}
		433
		434	/* called on ENOMEM in select/poll to kill some fds and retry */
		435	static void
		436	fd_enomem (EV_P)
		437	{
		438	int fd;
		439
		440	for (fd = anfdmax; fd--; )
		441	if (anfds [fd].events)
		442	{
		443	fd_kill (EV_A_ fd);
		444	return;
134	}	445	}
135	}	446	}
136		447
137	static struct ev_timer **atimers;	448	/* usually called after fork if method needs to re-arm all fds from scratch */
138	static int atimermax, atimercnt;
139
140	static struct ev_timer **rtimers;
141	static int rtimermax, rtimercnt;
142
143	static void	449	static void
144	upheap (struct ev_timer **timers, int k)	450	fd_rearm_all (EV_P)
145	{	451	{
146	struct ev_timer *w = timers [k];	452	int fd;
147		453
		454	/* this should be highly optimised to not do anything but set a flag */
		455	for (fd = 0; fd < anfdmax; ++fd)
		456	if (anfds [fd].events)
		457	{
		458	anfds [fd].events = 0;
		459	fd_change (EV_A_ fd);
		460	}
		461	}
		462
		463	/*****************************************************************************/
		464
		465	static void
		466	upheap (WT *heap, int k)
		467	{
		468	WT w = heap [k];
		469
148	while (k && timers [k >> 1]->at > w->at)	470	while (k && heap [k >> 1]->at > w->at)
149	{	471	{
150	timers [k] = timers [k >> 1];	472	heap [k] = heap [k >> 1];
151	timers [k]->active = k + 1;	473	((W)heap [k])->active = k + 1;
152	k >>= 1;	474	k >>= 1;
153	}	475	}
154		476
155	timers [k] = w;	477	heap [k] = w;
156	timers [k]->active = k + 1;	478	((W)heap [k])->active = k + 1;
157		479
158	}	480	}
159		481
160	static void	482	static void
161	downheap (struct ev_timer **timers, int N, int k)	483	downheap (WT *heap, int N, int k)
162	{	484	{
163	struct ev_timer *w = timers [k];	485	WT w = heap [k];
164		486
165	while (k < (N >> 1))	487	while (k < (N >> 1))
166	{	488	{
167	int j = k << 1;	489	int j = k << 1;
168		490
169	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	491	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
170	++j;	492	++j;
171		493
172	if (w->at <= timers [j]->at)	494	if (w->at <= heap [j]->at)
173	break;	495	break;
174		496
175	timers [k] = timers [j];	497	heap [k] = heap [j];
176	timers [k]->active = k + 1;	498	((W)heap [k])->active = k + 1;
177	k = j;	499	k = j;
178	}	500	}
179		501
180	timers [k] = w;	502	heap [k] = w;
181	timers [k]->active = k + 1;	503	((W)heap [k])->active = k + 1;
182	}	504	}
183		505
184	static struct ev_signal **signals;	506	/*****************************************************************************/
		507
		508	typedef struct
		509	{
		510	WL head;
		511	sig_atomic_t volatile gotsig;
		512	} ANSIG;
		513
		514	static ANSIG *signals;
185	static int signalmax;	515	static int signalmax;
186		516
		517	static int sigpipe [2];
		518	static sig_atomic_t volatile gotsig;
		519	static struct ev_io sigev;
		520
187	static void	521	static void
188	signals_init (struct ev_signal **base, int count)	522	signals_init (ANSIG *base, int count)
189	{	523	{
190	while (count--)	524	while (count--)
191	*base++ = 0;	525	{
192	}	526	base->head = 0;
		527	base->gotsig = 0;
193		528
		529	++base;
		530	}
		531	}
		532
		533	static void
		534	sighandler (int signum)
		535	{
		536	#if WIN32
		537	signal (signum, sighandler);
		538	#endif
		539
		540	signals [signum - 1].gotsig = 1;
		541
		542	if (!gotsig)
		543	{
		544	int old_errno = errno;
		545	gotsig = 1;
		546	#ifdef WIN32
		547	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		548	#else
		549	write (sigpipe [1], &signum, 1);
		550	#endif
		551	errno = old_errno;
		552	}
		553	}
		554
		555	static void
		556	sigcb (EV_P_ struct ev_io *iow, int revents)
		557	{
		558	WL w;
		559	int signum;
		560
		561	#ifdef WIN32
		562	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		563	#else
		564	read (sigpipe [0], &revents, 1);
		565	#endif
		566	gotsig = 0;
		567
		568	for (signum = signalmax; signum--; )
		569	if (signals [signum].gotsig)
		570	{
		571	signals [signum].gotsig = 0;
		572
		573	for (w = signals [signum].head; w; w = w->next)
		574	event (EV_A_ (W)w, EV_SIGNAL);
		575	}
		576	}
		577
		578	static void
		579	siginit (EV_P)
		580	{
		581	#ifndef WIN32
		582	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		583	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		584
		585	/* rather than sort out wether we really need nb, set it */
		586	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		587	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		588	#endif
		589
		590	ev_io_set (&sigev, sigpipe [0], EV_READ);
		591	ev_io_start (EV_A_ &sigev);
		592	ev_unref (EV_A); /* child watcher should not keep loop alive */
		593	}
		594
		595	/*****************************************************************************/
		596
		597	static struct ev_child *childs [PID_HASHSIZE];
		598
		599	#ifndef WIN32
		600
		601	static struct ev_signal childev;
		602
		603	#ifndef WCONTINUED
		604	# define WCONTINUED 0
		605	#endif
		606
		607	static void
		608	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		609	{
		610	struct ev_child *w;
		611
		612	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		613	if (w->pid == pid || !w->pid)
		614	{
		615	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		616	w->rpid = pid;
		617	w->rstatus = status;
		618	event (EV_A_ (W)w, EV_CHILD);
		619	}
		620	}
		621
		622	static void
		623	childcb (EV_P_ struct ev_signal *sw, int revents)
		624	{
		625	int pid, status;
		626
		627	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		628	{
		629	/* make sure we are called again until all childs have been reaped */
		630	event (EV_A_ (W)sw, EV_SIGNAL);
		631
		632	child_reap (EV_A_ sw, pid, pid, status);
		633	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		634	}
		635	}
		636
		637	#endif
		638
		639	/*****************************************************************************/
		640
		641	#if EV_USE_KQUEUE
		642	# include "ev_kqueue.c"
		643	#endif
194	#if HAVE_EPOLL	644	#if EV_USE_EPOLL
195	# include "ev_epoll.c"	645	# include "ev_epoll.c"
196	#endif	646	#endif
		647	#if EV_USE_POLL
		648	# include "ev_poll.c"
		649	#endif
197	#if HAVE_SELECT	650	#if EV_USE_SELECT
198	# include "ev_select.c"	651	# include "ev_select.c"
199	#endif	652	#endif
200		653
201	int ev_init (int flags)	654	int
		655	ev_version_major (void)
202	{	656	{
		657	return EV_VERSION_MAJOR;
		658	}
		659
		660	int
		661	ev_version_minor (void)
		662	{
		663	return EV_VERSION_MINOR;
		664	}
		665
		666	/* return true if we are running with elevated privileges and should ignore env variables */
		667	static int
		668	enable_secure (void)
		669	{
		670	#ifdef WIN32
		671	return 0;
		672	#else
		673	return getuid () != geteuid ()
		674	|| getgid () != getegid ();
		675	#endif
		676	}
		677
		678	int
		679	ev_method (EV_P)
		680	{
		681	return method;
		682	}
		683
		684	static void
		685	loop_init (EV_P_ int methods)
		686	{
		687	if (!method)
		688	{
203	#if HAVE_MONOTONIC	689	#if EV_USE_MONOTONIC
204	{	690	{
205	struct timespec ts;	691	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	692	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;	693	have_monotonic = 1;
208	}	694	}
209	#endif	695	#endif
210		696
211	ev_now = ev_time ();	697	rt_now = ev_time ();
212	now = get_clock ();	698	mn_now = get_clock ();
213	diff = ev_now - now;	699	now_floor = mn_now;
		700	rtmn_diff = rt_now - mn_now;
214		701
		702	if (methods == EVMETHOD_AUTO)
		703	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		704	methods = atoi (getenv ("LIBEV_METHODS"));
		705	else
		706	methods = EVMETHOD_ANY;
		707
		708	method = 0;
		709	#if EV_USE_WIN32
		710	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		711	#endif
		712	#if EV_USE_KQUEUE
		713	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		714	#endif
215	#if HAVE_EPOLL	715	#if EV_USE_EPOLL
216	if (epoll_init (flags))	716	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
217	return ev_method;
218	#endif	717	#endif
		718	#if EV_USE_POLL
		719	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		720	#endif
219	#if HAVE_SELECT	721	#if EV_USE_SELECT
220	if (select_init (flags))	722	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
221	return ev_method;
222	#endif	723	#endif
223		724
224	ev_method = EVMETHOD_NONE;	725	ev_watcher_init (&sigev, sigcb);
225	return ev_method;	726	ev_set_priority (&sigev, EV_MAXPRI);
		727	}
226	}	728	}
227		729
228	void ev_prefork (void)	730	void
229	{	731	loop_destroy (EV_P)
230	}
231
232	void ev_postfork_parent (void)
233	{
234	}
235
236	void ev_postfork_child (void)
237	{
238	#if HAVE_EPOLL
239	epoll_postfork_child ();
240	#endif
241	}
242
243	static void
244	call_pending ()
245	{	732	{
246	int i;	733	int i;
247		734
248	for (i = 0; i < pendingcnt; ++i)	735	#if EV_USE_WIN32
		736	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		737	#endif
		738	#if EV_USE_KQUEUE
		739	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		740	#endif
		741	#if EV_USE_EPOLL
		742	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		743	#endif
		744	#if EV_USE_POLL
		745	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		746	#endif
		747	#if EV_USE_SELECT
		748	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		749	#endif
		750
		751	for (i = NUMPRI; i--; )
		752	array_free (pending, [i]);
		753
		754	/* have to use the microsoft-never-gets-it-right macro */
		755	array_free_microshit (fdchange);
		756	array_free_microshit (timer);
		757	array_free_microshit (periodic);
		758	array_free_microshit (idle);
		759	array_free_microshit (prepare);
		760	array_free_microshit (check);
		761
		762	method = 0;
		763	}
		764
		765	static void
		766	loop_fork (EV_P)
		767	{
		768	#if EV_USE_EPOLL
		769	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		770	#endif
		771	#if EV_USE_KQUEUE
		772	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		773	#endif
		774
		775	if (ev_is_active (&sigev))
		776	{
		777	/* default loop */
		778
		779	ev_ref (EV_A);
		780	ev_io_stop (EV_A_ &sigev);
		781	close (sigpipe [0]);
		782	close (sigpipe [1]);
		783
		784	while (pipe (sigpipe))
		785	syserr ("(libev) error creating pipe");
		786
		787	siginit (EV_A);
249	{	788	}
250	ANPENDING *p = pendings + i;
251		789
252	if (p->w)	790	postfork = 0;
		791	}
		792
		793	#if EV_MULTIPLICITY
		794	struct ev_loop *
		795	ev_loop_new (int methods)
		796	{
		797	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		798
		799	memset (loop, 0, sizeof (struct ev_loop));
		800
		801	loop_init (EV_A_ methods);
		802
		803	if (ev_method (EV_A))
		804	return loop;
		805
		806	return 0;
		807	}
		808
		809	void
		810	ev_loop_destroy (EV_P)
		811	{
		812	loop_destroy (EV_A);
		813	ev_free (loop);
		814	}
		815
		816	void
		817	ev_loop_fork (EV_P)
		818	{
		819	postfork = 1;
		820	}
		821
		822	#endif
		823
		824	#if EV_MULTIPLICITY
		825	struct ev_loop default_loop_struct;
		826	static struct ev_loop *default_loop;
		827
		828	struct ev_loop *
		829	#else
		830	static int default_loop;
		831
		832	int
		833	#endif
		834	ev_default_loop (int methods)
		835	{
		836	if (sigpipe [0] == sigpipe [1])
		837	if (pipe (sigpipe))
		838	return 0;
		839
		840	if (!default_loop)
		841	{
		842	#if EV_MULTIPLICITY
		843	struct ev_loop *loop = default_loop = &default_loop_struct;
		844	#else
		845	default_loop = 1;
		846	#endif
		847
		848	loop_init (EV_A_ methods);
		849
		850	if (ev_method (EV_A))
253	{	851	{
254	p->w->pending = 0;	852	siginit (EV_A);
255	p->w->cb (p->w, p->events);	853
		854	#ifndef WIN32
		855	ev_signal_init (&childev, childcb, SIGCHLD);
		856	ev_set_priority (&childev, EV_MAXPRI);
		857	ev_signal_start (EV_A_ &childev);
		858	ev_unref (EV_A); /* child watcher should not keep loop alive */
		859	#endif
256	}	860	}
		861	else
		862	default_loop = 0;
		863	}
		864
		865	return default_loop;
		866	}
		867
		868	void
		869	ev_default_destroy (void)
		870	{
		871	#if EV_MULTIPLICITY
		872	struct ev_loop *loop = default_loop;
		873	#endif
		874
		875	#ifndef WIN32
		876	ev_ref (EV_A); /* child watcher */
		877	ev_signal_stop (EV_A_ &childev);
		878	#endif
		879
		880	ev_ref (EV_A); /* signal watcher */
		881	ev_io_stop (EV_A_ &sigev);
		882
		883	close (sigpipe [0]); sigpipe [0] = 0;
		884	close (sigpipe [1]); sigpipe [1] = 0;
		885
		886	loop_destroy (EV_A);
		887	}
		888
		889	void
		890	ev_default_fork (void)
		891	{
		892	#if EV_MULTIPLICITY
		893	struct ev_loop *loop = default_loop;
		894	#endif
		895
		896	if (method)
		897	postfork = 1;
		898	}
		899
		900	/*****************************************************************************/
		901
		902	static int
		903	any_pending (EV_P)
		904	{
		905	int pri;
		906
		907	for (pri = NUMPRI; pri--; )
		908	if (pendingcnt [pri])
		909	return 1;
		910
		911	return 0;
		912	}
		913
		914	static void
		915	call_pending (EV_P)
		916	{
		917	int pri;
		918
		919	for (pri = NUMPRI; pri--; )
		920	while (pendingcnt [pri])
		921	{
		922	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		923
		924	if (p->w)
		925	{
		926	p->w->pending = 0;
		927	p->w->cb (EV_A_ p->w, p->events);
		928	}
257	}	929	}
258
259	pendingcnt = 0;
260	}	930	}
261		931
262	static void	932	static void
263	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	933	timers_reify (EV_P)
264	{	934	{
265	while (timercnt && timers [0]->at <= now)	935	while (timercnt && ((WT)timers [0])->at <= mn_now)
266	{	936	{
267	struct ev_timer *w = timers [0];	937	struct ev_timer *w = timers [0];
		938
		939	assert (("inactive timer on timer heap detected", ev_is_active (w)));
268		940
269	/* first reschedule or stop timer */	941	/* first reschedule or stop timer */
270	if (w->repeat)	942	if (w->repeat)
271	{	943	{
272	if (w->is_abs)	944	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
273	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
274	else
275	w->at = now + w->repeat;	945	((WT)w)->at = mn_now + w->repeat;
276
277	assert (w->at > now);
278
279	downheap (timers, timercnt, 0);	946	downheap ((WT *)timers, timercnt, 0);
280	}	947	}
281	else	948	else
		949	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		950
		951	event (EV_A_ (W)w, EV_TIMEOUT);
		952	}
		953	}
		954
		955	static void
		956	periodics_reify (EV_P)
		957	{
		958	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		959	{
		960	struct ev_periodic *w = periodics [0];
		961
		962	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		963
		964	/* first reschedule or stop timer */
		965	if (w->interval)
282	{	966	{
283	evtimer_stop (w); /* nonrepeating: stop timer */	967	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
284	--timercnt; /* maybe pass by reference instead? */	968	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		969	downheap ((WT *)periodics, periodiccnt, 0);
285	}	970	}
		971	else
		972	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
286		973
287	event ((struct ev_watcher *)w, EV_TIMEOUT);	974	event (EV_A_ (W)w, EV_PERIODIC);
288	}	975	}
289	}	976	}
290		977
291	static void	978	static void
292	time_update ()	979	periodics_reschedule (EV_P)
293	{	980	{
294	int i;	981	int i;
295	ev_now = ev_time ();
296		982
297	if (have_monotonic)	983	/* adjust periodics after time jump */
		984	for (i = 0; i < periodiccnt; ++i)
298	{	985	{
299	ev_tstamp odiff = diff;	986	struct ev_periodic *w = periodics [i];
300		987
301	/* detecting time jumps is much more difficult */	988	if (w->interval)
302	for (i = 2; --i; ) /* loop a few times, before making important decisions */
303	{	989	{
304	now = get_clock ();	990	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
305	diff = ev_now - now;
306		991
307	if (fabs (odiff - diff) < MIN_TIMEJUMP)	992	if (fabs (diff) >= 1e-4)
308	return; /* all is well */	993	{
		994	ev_periodic_stop (EV_A_ w);
		995	ev_periodic_start (EV_A_ w);
309		996
310	ev_now = ev_time ();	997	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		998	}
311	}	999	}
		1000	}
		1001	}
312		1002
313	/* time jump detected, reschedule atimers */	1003	inline int
314	for (i = 0; i < atimercnt; ++i)	1004	time_update_monotonic (EV_P)
		1005	{
		1006	mn_now = get_clock ();
		1007
		1008	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1009	{
		1010	rt_now = rtmn_diff + mn_now;
		1011	return 0;
		1012	}
		1013	else
		1014	{
		1015	now_floor = mn_now;
		1016	rt_now = ev_time ();
		1017	return 1;
		1018	}
		1019	}
		1020
		1021	static void
		1022	time_update (EV_P)
		1023	{
		1024	int i;
		1025
		1026	#if EV_USE_MONOTONIC
		1027	if (expect_true (have_monotonic))
		1028	{
		1029	if (time_update_monotonic (EV_A))
315	{	1030	{
316	struct ev_timer *w = atimers [i];	1031	ev_tstamp odiff = rtmn_diff;
317	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1032
		1033	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1034	{
		1035	rtmn_diff = rt_now - mn_now;
		1036
		1037	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1038	return; /* all is well */
		1039
		1040	rt_now = ev_time ();
		1041	mn_now = get_clock ();
		1042	now_floor = mn_now;
		1043	}
		1044
		1045	periodics_reschedule (EV_A);
		1046	/* no timer adjustment, as the monotonic clock doesn't jump */
		1047	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
318	}	1048	}
319	}	1049	}
320	else	1050	else
		1051	#endif
321	{	1052	{
322	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1053	rt_now = ev_time ();
323	/* time jump detected, adjust rtimers */	1054
		1055	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1056	{
		1057	periodics_reschedule (EV_A);
		1058
		1059	/* adjust timers. this is easy, as the offset is the same for all */
324	for (i = 0; i < rtimercnt; ++i)	1060	for (i = 0; i < timercnt; ++i)
325	rtimers [i]->at += ev_now - now;	1061	((WT)timers [i])->at += rt_now - mn_now;
		1062	}
326		1063
327	now = ev_now;	1064	mn_now = rt_now;
328	}	1065	}
329	}	1066	}
330		1067
331	int ev_loop_done;	1068	void
		1069	ev_ref (EV_P)
		1070	{
		1071	++activecnt;
		1072	}
332		1073
		1074	void
		1075	ev_unref (EV_P)
		1076	{
		1077	--activecnt;
		1078	}
		1079
		1080	static int loop_done;
		1081
		1082	void
333	void ev_loop (int flags)	1083	ev_loop (EV_P_ int flags)
334	{	1084	{
335	double block;	1085	double block;
336	ev_loop_done = flags & EVLOOP_ONESHOT;	1086	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
337		1087
338	do	1088	do
339	{	1089	{
		1090	/* queue check watchers (and execute them) */
		1091	if (expect_false (preparecnt))
		1092	{
		1093	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1094	call_pending (EV_A);
		1095	}
		1096
		1097	/* we might have forked, so reify kernel state if necessary */
		1098	if (expect_false (postfork))
		1099	loop_fork (EV_A);
		1100
340	/* update fd-related kernel structures */	1101	/* update fd-related kernel structures */
341	method_reify (); fdchangecnt = 0;	1102	fd_reify (EV_A);
342		1103
343	/* calculate blocking time */	1104	/* calculate blocking time */
		1105
		1106	/* we only need this for !monotonic clock or timers, but as we basically
		1107	always have timers, we just calculate it always */
		1108	#if EV_USE_MONOTONIC
		1109	if (expect_true (have_monotonic))
		1110	time_update_monotonic (EV_A);
		1111	else
		1112	#endif
		1113	{
		1114	rt_now = ev_time ();
		1115	mn_now = rt_now;
		1116	}
		1117
344	if (flags & EVLOOP_NONBLOCK)	1118	if (flags & EVLOOP_NONBLOCK || idlecnt)
345	block = 0.;	1119	block = 0.;
346	else	1120	else
347	{	1121	{
348	block = MAX_BLOCKTIME;	1122	block = MAX_BLOCKTIME;
349		1123
350	if (rtimercnt)	1124	if (timercnt)
351	{	1125	{
352	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1126	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
353	if (block > to) block = to;	1127	if (block > to) block = to;
354	}	1128	}
355		1129
356	if (atimercnt)	1130	if (periodiccnt)
357	{	1131	{
358	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1132	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
359	if (block > to) block = to;	1133	if (block > to) block = to;
360	}	1134	}
361		1135
362	if (block < 0.) block = 0.;	1136	if (block < 0.) block = 0.;
363	}	1137	}
364		1138
365	method_poll (block);	1139	method_poll (EV_A_ block);
366		1140
367	/* update ev_now, do magic */	1141	/* update rt_now, do magic */
368	time_update ();	1142	time_update (EV_A);
369		1143
370	/* put pending timers into pendign queue and reschedule them */	1144	/* queue pending timers and reschedule them */
371	/* absolute timers first */	1145	timers_reify (EV_A); /* relative timers called last */
372	timers_reify (atimers, atimercnt, ev_now);	1146	periodics_reify (EV_A); /* absolute timers called first */
373	/* relative timers second */
374	timers_reify (rtimers, rtimercnt, now);
375		1147
		1148	/* queue idle watchers unless io or timers are pending */
		1149	if (idlecnt && !any_pending (EV_A))
		1150	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1151
		1152	/* queue check watchers, to be executed first */
		1153	if (checkcnt)
		1154	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1155
376	call_pending ();	1156	call_pending (EV_A);
377	}	1157	}
378	while (!ev_loop_done);	1158	while (activecnt && !loop_done);
379	}
380		1159
381	static void	1160	if (loop_done != 2)
382	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1161	loop_done = 0;
		1162	}
		1163
		1164	void
		1165	ev_unloop (EV_P_ int how)
		1166	{
		1167	loop_done = how;
		1168	}
		1169
		1170	/*****************************************************************************/
		1171
		1172	inline void
		1173	wlist_add (WL *head, WL elem)
383	{	1174	{
384	elem->next = *head;	1175	elem->next = *head;
385	*head = elem;	1176	*head = elem;
386	}	1177	}
387		1178
388	static void	1179	inline void
389	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1180	wlist_del (WL *head, WL elem)
390	{	1181	{
391	while (*head)	1182	while (*head)
392	{	1183	{
393	if (*head == elem)	1184	if (*head == elem)
394	{	1185	{
…		…
398		1189
399	head = &(*head)->next;	1190	head = &(*head)->next;
400	}	1191	}
401	}	1192	}
402		1193
403	static void	1194	inline void
404	ev_start (struct ev_watcher *w, int active)	1195	ev_clear_pending (EV_P_ W w)
405	{	1196	{
		1197	if (w->pending)
		1198	{
		1199	pendings [ABSPRI (w)][w->pending - 1].w = 0;
406	w->pending = 0;	1200	w->pending = 0;
		1201	}
		1202	}
		1203
		1204	inline void
		1205	ev_start (EV_P_ W w, int active)
		1206	{
		1207	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1208	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1209
407	w->active = active;	1210	w->active = active;
		1211	ev_ref (EV_A);
408	}	1212	}
409		1213
410	static void	1214	inline void
411	ev_stop (struct ev_watcher *w)	1215	ev_stop (EV_P_ W w)
412	{	1216	{
413	if (w->pending)	1217	ev_unref (EV_A);
414	pendings [w->pending - 1].w = 0;
415
416	w->active = 0;	1218	w->active = 0;
417	/* nop */
418	}	1219	}
419		1220
		1221	/*****************************************************************************/
		1222
420	void	1223	void
421	evio_start (struct ev_io *w)	1224	ev_io_start (EV_P_ struct ev_io *w)
422	{	1225	{
		1226	int fd = w->fd;
		1227
423	if (ev_is_active (w))	1228	if (ev_is_active (w))
424	return;	1229	return;
425		1230
426	int fd = w->fd;	1231	assert (("ev_io_start called with negative fd", fd >= 0));
427		1232
428	ev_start ((struct ev_watcher *)w, 1);	1233	ev_start (EV_A_ (W)w, 1);
429	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1234	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
430	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1235	wlist_add ((WL *)&anfds[fd].head, (WL)w);
431		1236
432	++fdchangecnt;	1237	fd_change (EV_A_ fd);
433	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
434	fdchanges [fdchangecnt - 1] = fd;
435	}	1238	}
436		1239
437	void	1240	void
438	evio_stop (struct ev_io *w)	1241	ev_io_stop (EV_P_ struct ev_io *w)
439	{	1242	{
		1243	ev_clear_pending (EV_A_ (W)w);
440	if (!ev_is_active (w))	1244	if (!ev_is_active (w))
441	return;	1245	return;
442		1246
443	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1247	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
444	ev_stop ((struct ev_watcher *)w);	1248	ev_stop (EV_A_ (W)w);
445		1249
446	++fdchangecnt;	1250	fd_change (EV_A_ w->fd);
447	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
448	fdchanges [fdchangecnt - 1] = w->fd;
449	}	1251	}
450		1252
451	void	1253	void
452	evtimer_start (struct ev_timer *w)	1254	ev_timer_start (EV_P_ struct ev_timer *w)
453	{	1255	{
454	if (ev_is_active (w))	1256	if (ev_is_active (w))
455	return;	1257	return;
456		1258
457	if (w->is_abs)	1259	((WT)w)->at += mn_now;
		1260
		1261	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1262
		1263	ev_start (EV_A_ (W)w, ++timercnt);
		1264	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1265	timers [timercnt - 1] = w;
		1266	upheap ((WT *)timers, timercnt - 1);
		1267
		1268	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1269	}
		1270
		1271	void
		1272	ev_timer_stop (EV_P_ struct ev_timer *w)
		1273	{
		1274	ev_clear_pending (EV_A_ (W)w);
		1275	if (!ev_is_active (w))
		1276	return;
		1277
		1278	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1279
		1280	if (((W)w)->active < timercnt--)
		1281	{
		1282	timers [((W)w)->active - 1] = timers [timercnt];
		1283	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
458	{	1284	}
459	/* this formula differs from the one in timer_reify becuse we do not round up */	1285
		1286	((WT)w)->at = w->repeat;
		1287
		1288	ev_stop (EV_A_ (W)w);
		1289	}
		1290
		1291	void
		1292	ev_timer_again (EV_P_ struct ev_timer *w)
		1293	{
		1294	if (ev_is_active (w))
		1295	{
460	if (w->repeat)	1296	if (w->repeat)
461	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1297	{
		1298	((WT)w)->at = mn_now + w->repeat;
		1299	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1300	}
		1301	else
		1302	ev_timer_stop (EV_A_ w);
		1303	}
		1304	else if (w->repeat)
		1305	ev_timer_start (EV_A_ w);
		1306	}
462		1307
463	ev_start ((struct ev_watcher *)w, ++atimercnt);	1308	void
464	array_needsize (atimers, atimermax, atimercnt, );	1309	ev_periodic_start (EV_P_ struct ev_periodic *w)
465	atimers [atimercnt - 1] = w;	1310	{
466	upheap (atimers, atimercnt - 1);	1311	if (ev_is_active (w))
		1312	return;
		1313
		1314	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1315
		1316	/* this formula differs from the one in periodic_reify because we do not always round up */
		1317	if (w->interval)
		1318	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1319
		1320	ev_start (EV_A_ (W)w, ++periodiccnt);
		1321	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1322	periodics [periodiccnt - 1] = w;
		1323	upheap ((WT *)periodics, periodiccnt - 1);
		1324
		1325	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1326	}
		1327
		1328	void
		1329	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1330	{
		1331	ev_clear_pending (EV_A_ (W)w);
		1332	if (!ev_is_active (w))
		1333	return;
		1334
		1335	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1336
		1337	if (((W)w)->active < periodiccnt--)
467	}	1338	{
		1339	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1340	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1341	}
		1342
		1343	ev_stop (EV_A_ (W)w);
		1344	}
		1345
		1346	void
		1347	ev_idle_start (EV_P_ struct ev_idle *w)
		1348	{
		1349	if (ev_is_active (w))
		1350	return;
		1351
		1352	ev_start (EV_A_ (W)w, ++idlecnt);
		1353	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1354	idles [idlecnt - 1] = w;
		1355	}
		1356
		1357	void
		1358	ev_idle_stop (EV_P_ struct ev_idle *w)
		1359	{
		1360	ev_clear_pending (EV_A_ (W)w);
		1361	if (ev_is_active (w))
		1362	return;
		1363
		1364	idles [((W)w)->active - 1] = idles [--idlecnt];
		1365	ev_stop (EV_A_ (W)w);
		1366	}
		1367
		1368	void
		1369	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1370	{
		1371	if (ev_is_active (w))
		1372	return;
		1373
		1374	ev_start (EV_A_ (W)w, ++preparecnt);
		1375	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1376	prepares [preparecnt - 1] = w;
		1377	}
		1378
		1379	void
		1380	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1381	{
		1382	ev_clear_pending (EV_A_ (W)w);
		1383	if (ev_is_active (w))
		1384	return;
		1385
		1386	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1387	ev_stop (EV_A_ (W)w);
		1388	}
		1389
		1390	void
		1391	ev_check_start (EV_P_ struct ev_check *w)
		1392	{
		1393	if (ev_is_active (w))
		1394	return;
		1395
		1396	ev_start (EV_A_ (W)w, ++checkcnt);
		1397	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1398	checks [checkcnt - 1] = w;
		1399	}
		1400
		1401	void
		1402	ev_check_stop (EV_P_ struct ev_check *w)
		1403	{
		1404	ev_clear_pending (EV_A_ (W)w);
		1405	if (ev_is_active (w))
		1406	return;
		1407
		1408	checks [((W)w)->active - 1] = checks [--checkcnt];
		1409	ev_stop (EV_A_ (W)w);
		1410	}
		1411
		1412	#ifndef SA_RESTART
		1413	# define SA_RESTART 0
		1414	#endif
		1415
		1416	void
		1417	ev_signal_start (EV_P_ struct ev_signal *w)
		1418	{
		1419	#if EV_MULTIPLICITY
		1420	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1421	#endif
		1422	if (ev_is_active (w))
		1423	return;
		1424
		1425	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1426
		1427	ev_start (EV_A_ (W)w, 1);
		1428	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1429	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1430
		1431	if (!((WL)w)->next)
		1432	{
		1433	#if WIN32
		1434	signal (w->signum, sighandler);
		1435	#else
		1436	struct sigaction sa;
		1437	sa.sa_handler = sighandler;
		1438	sigfillset (&sa.sa_mask);
		1439	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1440	sigaction (w->signum, &sa, 0);
		1441	#endif
		1442	}
		1443	}
		1444
		1445	void
		1446	ev_signal_stop (EV_P_ struct ev_signal *w)
		1447	{
		1448	ev_clear_pending (EV_A_ (W)w);
		1449	if (!ev_is_active (w))
		1450	return;
		1451
		1452	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1453	ev_stop (EV_A_ (W)w);
		1454
		1455	if (!signals [w->signum - 1].head)
		1456	signal (w->signum, SIG_DFL);
		1457	}
		1458
		1459	void
		1460	ev_child_start (EV_P_ struct ev_child *w)
		1461	{
		1462	#if EV_MULTIPLICITY
		1463	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1464	#endif
		1465	if (ev_is_active (w))
		1466	return;
		1467
		1468	ev_start (EV_A_ (W)w, 1);
		1469	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1470	}
		1471
		1472	void
		1473	ev_child_stop (EV_P_ struct ev_child *w)
		1474	{
		1475	ev_clear_pending (EV_A_ (W)w);
		1476	if (ev_is_active (w))
		1477	return;
		1478
		1479	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1480	ev_stop (EV_A_ (W)w);
		1481	}
		1482
		1483	/*****************************************************************************/
		1484
		1485	struct ev_once
		1486	{
		1487	struct ev_io io;
		1488	struct ev_timer to;
		1489	void (*cb)(int revents, void *arg);
		1490	void *arg;
		1491	};
		1492
		1493	static void
		1494	once_cb (EV_P_ struct ev_once *once, int revents)
		1495	{
		1496	void (*cb)(int revents, void *arg) = once->cb;
		1497	void *arg = once->arg;
		1498
		1499	ev_io_stop (EV_A_ &once->io);
		1500	ev_timer_stop (EV_A_ &once->to);
		1501	ev_free (once);
		1502
		1503	cb (revents, arg);
		1504	}
		1505
		1506	static void
		1507	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1508	{
		1509	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1510	}
		1511
		1512	static void
		1513	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1514	{
		1515	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1516	}
		1517
		1518	void
		1519	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1520	{
		1521	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1522
		1523	if (!once)
		1524	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
468	else	1525	else
469	{	1526	{
470	w->at += now;	1527	once->cb = cb;
		1528	once->arg = arg;
471		1529
472	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1530	ev_watcher_init (&once->io, once_cb_io);
473	array_needsize (rtimers, rtimermax, rtimercnt, );	1531	if (fd >= 0)
474	rtimers [rtimercnt - 1] = w;
475	upheap (rtimers, rtimercnt - 1);
476	}
477
478	}
479
480	void
481	evtimer_stop (struct ev_timer *w)
482	{
483	if (!ev_is_active (w))
484	return;
485
486	if (w->is_abs)
487	{
488	if (w->active < atimercnt--)
489	{	1532	{
490	atimers [w->active - 1] = atimers [atimercnt];	1533	ev_io_set (&once->io, fd, events);
491	downheap (atimers, atimercnt, w->active - 1);	1534	ev_io_start (EV_A_ &once->io);
492	}	1535	}
493	}	1536
494	else	1537	ev_watcher_init (&once->to, once_cb_to);
495	{	1538	if (timeout >= 0.)
496	if (w->active < rtimercnt--)
497	{	1539	{
498	rtimers [w->active - 1] = rtimers [rtimercnt];	1540	ev_timer_set (&once->to, timeout, 0.);
499	downheap (rtimers, rtimercnt, w->active - 1);	1541	ev_timer_start (EV_A_ &once->to);
500	}	1542	}
501	}	1543	}
502
503	ev_stop ((struct ev_watcher *)w);
504	}	1544	}
505		1545
506	void
507	evsignal_start (struct ev_signal *w)
508	{
509	if (ev_is_active (w))
510	return;
511
512	ev_start ((struct ev_watcher *)w, 1);
513	array_needsize (signals, signalmax, w->signum, signals_init);
514	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
515	}
516
517	void
518	evsignal_stop (struct ev_signal *w)
519	{
520	if (!ev_is_active (w))
521	return;
522
523	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
524	ev_stop ((struct ev_watcher *)w);
525	}
526
527	/*****************************************************************************/
528	#if 1
529
530	static void
531	sin_cb (struct ev_io *w, int revents)
532	{
533	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
534	}
535
536	static void
537	ocb (struct ev_timer *w, int revents)
538	{
539	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
540	evtimer_stop (w);
541	evtimer_start (w);
542	}
543
544	int main (void)
545	{
546	struct ev_io sin;
547
548	ev_init (0);
549
550	evw_init (&sin, sin_cb, 55);
551	evio_set (&sin, 0, EV_READ);
552	evio_start (&sin);
553
554	struct ev_timer t[10000];
555
556	#if 1
557	int i;
558	for (i = 0; i < 10000; ++i)
559	{
560	struct ev_timer *w = t + i;
561	evw_init (w, ocb, i);
562	evtimer_set_abs (w, drand48 (), 0.99775533);
563	evtimer_start (w);
564	if (drand48 () < 0.5)
565	evtimer_stop (w);
566	}
567	#endif
568
569	struct ev_timer t1;
570	evw_init (&t1, ocb, 0);
571	evtimer_set_abs (&t1, 5, 10);
572	evtimer_start (&t1);
573
574	ev_loop (0);
575
576	return 0;
577	}
578
579	#endif
580
581
582
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