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Comparing libev/ev.c (file contents):
Revision 1.3 by root, Tue Oct 30 21:45:00 2007 UTC vs.
Revision 1.77 by root, Thu Nov 8 00:44:17 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
		64	#include <assert.h>
6	#include <errno.h>	65	#include <errno.h>
7	#include <sys/time.h>	66	#include <sys/types.h>
8	#include <time.h>	67	#include <time.h>
9		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
10	#ifdef CLOCK_MONOTONIC	114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	116	# define EV_USE_MONOTONIC 0
12	#endif	117	#endif
13		118
14	#define HAVE_EPOLL 1	119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	121	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	122	#endif
17		123
18	#define MAX_BLOCKTIME 60.	124	/**/
		125
		126	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		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 */
19		130
20	#include "ev.h"	131	#include "ev.h"
21		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
22	struct ev_watcher {	147	typedef struct ev_watcher *W;
23	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"
24	};	224	};
		225	# undef VAR
		226	# include "ev_wrap.h"
25		227
26	struct ev_watcher_list {	228	#else
27	EV_WATCHER_LIST (ev_watcher_list);
28	};
29		229
30	ev_tstamp ev_now;	230	# define VAR(name,decl) static decl;
31	int ev_method;	231	# include "ev_vars.h"
		232	# undef VAR
32		233
33	static int have_monotonic; /* runtime */	234	#endif
34		235
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	236	/*****************************************************************************/
36	static void (*method_reify)(void);
37	static void (*method_poll)(ev_tstamp timeout);
38		237
39	ev_tstamp	238	inline ev_tstamp
40	ev_time (void)	239	ev_time (void)
41	{	240	{
42	#if HAVE_REALTIME	241	#if EV_USE_REALTIME
43	struct timespec ts;	242	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	243	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	244	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	245	#else
47	struct timeval tv;	246	struct timeval tv;
48	gettimeofday (&tv, 0);	247	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	248	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	249	#endif
51	}	250	}
52		251
53	static ev_tstamp	252	inline ev_tstamp
54	get_clock (void)	253	get_clock (void)
55	{	254	{
56	#if HAVE_MONOTONIC	255	#if EV_USE_MONOTONIC
57	if (have_monotonic)	256	if (expect_true (have_monotonic))
58	{	257	{
59	struct timespec ts;	258	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	259	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	260	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	261	}
63	#endif	262	#endif
64		263
65	return ev_time ();	264	return ev_time ();
66	}	265	}
67		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
68	#define array_needsize(base,cur,cnt,init) \	275	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	276	if (expect_false ((cnt) > cur)) \
70	{ \	277	{ \
71	int newcnt = cur ? cur << 1 : 16; \	278	int newcnt = cur; \
72	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	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	285	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
74	init (base + cur, newcnt - cur); \	286	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	287	cur = newcnt; \
76	}	288	}
77		289
78	typedef struct	290	#define array_slim(type,stem) \
79	{	291	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
80	struct ev_io *head;	292	{ \
81	unsigned char wev, rev; /* want, received event set */	293	stem ## max = array_roundsize (stem ## cnt >> 1); \
82	} ANFD;	294	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		295	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		296	}
83		297
84	static ANFD *anfds;	298	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
85	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;
86		302
87	static int *fdchanges;	303	#define array_free(stem, idx) \
88	static int fdchangemax, fdchangecnt;	304	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		305
		306	/*****************************************************************************/
89		307
90	static void	308	static void
91	anfds_init (ANFD *base, int count)	309	anfds_init (ANFD *base, int count)
92	{	310	{
93	while (count--)	311	while (count--)
94	{	312	{
95	base->head = 0;	313	base->head = 0;
96	base->wev = base->rev = EV_NONE;	314	base->events = EV_NONE;
		315	base->reify = 0;
		316
97	++base;	317	++base;
98	}	318	}
99	}	319	}
100		320
101	typedef struct
102	{
103	struct ev_watcher *w;
104	int events;
105	} ANPENDING;
106
107	static ANPENDING *pendings;
108	static int pendingmax, pendingcnt;
109
110	static void	321	static void
111	event (struct ev_watcher *w, int events)	322	event (EV_P_ W w, int events)
112	{	323	{
		324	if (w->pending)
		325	{
		326	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		327	return;
		328	}
		329
113	w->pending = ++pendingcnt;	330	w->pending = ++pendingcnt [ABSPRI (w)];
114	array_needsize (pendings, pendingmax, pendingcnt, );	331	array_needsize (ANPENDING, pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], (void));
115	pendings [pendingcnt - 1].w = w;	332	pendings [ABSPRI (w)][w->pending - 1].w = w;
116	pendings [pendingcnt - 1].events = events;	333	pendings [ABSPRI (w)][w->pending - 1].events = events;
117	}	334	}
118		335
119	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
120	fd_event (int fd, int events)	346	fd_event (EV_P_ int fd, int events)
121	{	347	{
122	ANFD *anfd = anfds + fd;	348	ANFD *anfd = anfds + fd;
123	struct ev_io *w;	349	struct ev_io *w;
124		350
125	for (w = anfd->head; w; w = w->next)	351	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
126	{	352	{
127	int ev = w->events & events;	353	int ev = w->events & events;
128		354
129	if (ev)	355	if (ev)
130	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;
131	}	445	}
132	}	446	}
133		447
134	static struct ev_timer **timers;	448	/* usually called after fork if method needs to re-arm all fds from scratch */
135	static int timermax, timercnt;
136
137	static void	449	static void
138	upheap (int k)	450	fd_rearm_all (EV_P)
139	{	451	{
140	struct ev_timer *w = timers [k];	452	int fd;
141		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
142	while (k && timers [k >> 1]->at > w->at)	470	while (k && heap [k >> 1]->at > w->at)
143	{	471	{
144	timers [k] = timers [k >> 1];	472	heap [k] = heap [k >> 1];
145	timers [k]->active = k + 1;	473	((W)heap [k])->active = k + 1;
146	k >>= 1;	474	k >>= 1;
147	}	475	}
148		476
149	timers [k] = w;	477	heap [k] = w;
150	timers [k]->active = k + 1;	478	((W)heap [k])->active = k + 1;
151		479
152	}	480	}
153		481
154	static void	482	static void
155	downheap (int k)	483	downheap (WT *heap, int N, int k)
156	{	484	{
157	struct ev_timer *w = timers [k];	485	WT w = heap [k];
158		486
159	while (k < (timercnt >> 1))	487	while (k < (N >> 1))
160	{	488	{
161	int j = k << 1;	489	int j = k << 1;
162		490
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)	491	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
164	++j;	492	++j;
165		493
166	if (w->at <= timers [j]->at)	494	if (w->at <= heap [j]->at)
167	break;	495	break;
168		496
169	timers [k] = timers [j];	497	heap [k] = heap [j];
170	timers [k]->active = k + 1;	498	((W)heap [k])->active = k + 1;
171	k = j;	499	k = j;
172	}	500	}
173		501
174	timers [k] = w;	502	heap [k] = w;
175	timers [k]->active = k + 1;	503	((W)heap [k])->active = k + 1;
176	}	504	}
177		505
178	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;
179	static int signalmax, signalcnt;	515	static int signalmax;
180		516
		517	static int sigpipe [2];
		518	static sig_atomic_t volatile gotsig;
		519	static struct ev_io sigev;
		520
181	static void	521	static void
182	signals_init (struct ev_signal **base, int count)	522	signals_init (ANSIG *base, int count)
183	{	523	{
184	while (count--)	524	while (count--)
185	*base++ = 0;	525	{
186	}	526	base->head = 0;
		527	base->gotsig = 0;
187		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
188	#if HAVE_EPOLL	644	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	645	# include "ev_epoll.c"
190	#endif	646	#endif
		647	#if EV_USE_POLL
		648	# include "ev_poll.c"
		649	#endif
191	#if HAVE_SELECT	650	#if EV_USE_SELECT
192	# include "ev_select.c"	651	# include "ev_select.c"
193	#endif	652	#endif
194		653
195	int ev_init (int flags)	654	int
		655	ev_version_major (void)
196	{	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	{
197	#if HAVE_MONOTONIC	689	#if EV_USE_MONOTONIC
198	{	690	{
199	struct timespec ts;	691	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	692	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	693	have_monotonic = 1;
202	}	694	}
203	#endif	695	#endif
204		696
205	ev_now = ev_time ();	697	rt_now = ev_time ();
		698	mn_now = get_clock ();
		699	now_floor = mn_now;
		700	rtmn_diff = rt_now - mn_now;
206		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
207	#if HAVE_EPOLL	715	#if EV_USE_EPOLL
208	if (epoll_init (flags))	716	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
209	return ev_method;
210	#endif	717	#endif
		718	#if EV_USE_POLL
		719	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		720	#endif
211	#if HAVE_SELECT	721	#if EV_USE_SELECT
212	if (select_init (flags))	722	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
213	return ev_method;
214	#endif	723	#endif
215		724
216	ev_method = EVMETHOD_NONE;	725	ev_watcher_init (&sigev, sigcb);
217	return ev_method;	726	ev_set_priority (&sigev, EV_MAXPRI);
		727	}
218	}	728	}
219		729
220	void ev_prefork (void)	730	void
221	{	731	loop_destroy (EV_P)
222	}
223
224	void ev_postfork_parent (void)
225	{
226	}
227
228	void ev_postfork_child (void)
229	{
230	#if HAVE_EPOLL
231	epoll_postfork_child ();
232	#endif
233	}
234
235	static void
236	call_pending ()
237	{	732	{
238	int i;	733	int i;
239		734
240	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);
241	{	788	}
242	ANPENDING *p = pendings + i;
243		789
244	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))
245	{	851	{
246	p->w->pending = 0;	852	siginit (EV_A);
247	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
248	}	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	}
249	}	929	}
250
251	pendingcnt = 0;
252	}	930	}
253		931
254	static void	932	static void
255	timer_reify (void)	933	timers_reify (EV_P)
256	{	934	{
257	while (timercnt && timers [0]->at <= ev_now)	935	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	936	{
259	struct ev_timer *w = timers [0];	937	struct ev_timer *w = timers [0];
260		938
		939	assert (("inactive timer on timer heap detected", ev_is_active (w)));
		940
261	/* first reschedule timer */	941	/* first reschedule or stop timer */
262	if (w->repeat)	942	if (w->repeat)
263	{	943	{
264	if (w->is_abs)	944	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
265	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;
266	else
267	w->at = ev_now + w->repeat;	945	((WT)w)->at = mn_now + w->repeat;
268		946	downheap ((WT *)timers, timercnt, 0);
269	downheap (0);
270	}	947	}
271	else	948	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	949	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		950
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	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)
275	}	959	{
276	}	960	struct ev_periodic *w = periodics [0];
277		961
278	int ev_loop_done;	962	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
279		963
		964	/* first reschedule or stop timer */
		965	if (w->reschedule_cb)
		966	{
		967	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, rt_now + 0.0001);
		968
		969	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > rt_now));
		970	downheap ((WT *)periodics, periodiccnt, 0);
		971	}
		972	else if (w->interval)
		973	{
		974	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		975	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		976	downheap ((WT *)periodics, periodiccnt, 0);
		977	}
		978	else
		979	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		980
		981	event (EV_A_ (W)w, EV_PERIODIC);
		982	}
		983	}
		984
		985	static void
		986	periodics_reschedule (EV_P)
		987	{
		988	int i;
		989
		990	/* adjust periodics after time jump */
		991	for (i = 0; i < periodiccnt; ++i)
		992	{
		993	struct ev_periodic *w = periodics [i];
		994
		995	if (w->reschedule_cb)
		996	((WT)w)->at = w->reschedule_cb (w, rt_now);
		997	else if (w->interval)
		998	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		999	}
		1000
		1001	/* now rebuild the heap */
		1002	for (i = periodiccnt >> 1; i--; )
		1003	downheap ((WT *)periodics, periodiccnt, i);
		1004	}
		1005
		1006	inline int
		1007	time_update_monotonic (EV_P)
		1008	{
		1009	mn_now = get_clock ();
		1010
		1011	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1012	{
		1013	rt_now = rtmn_diff + mn_now;
		1014	return 0;
		1015	}
		1016	else
		1017	{
		1018	now_floor = mn_now;
		1019	rt_now = ev_time ();
		1020	return 1;
		1021	}
		1022	}
		1023
		1024	static void
		1025	time_update (EV_P)
		1026	{
		1027	int i;
		1028
		1029	#if EV_USE_MONOTONIC
		1030	if (expect_true (have_monotonic))
		1031	{
		1032	if (time_update_monotonic (EV_A))
		1033	{
		1034	ev_tstamp odiff = rtmn_diff;
		1035
		1036	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1037	{
		1038	rtmn_diff = rt_now - mn_now;
		1039
		1040	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1041	return; /* all is well */
		1042
		1043	rt_now = ev_time ();
		1044	mn_now = get_clock ();
		1045	now_floor = mn_now;
		1046	}
		1047
		1048	periodics_reschedule (EV_A);
		1049	/* no timer adjustment, as the monotonic clock doesn't jump */
		1050	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1051	}
		1052	}
		1053	else
		1054	#endif
		1055	{
		1056	rt_now = ev_time ();
		1057
		1058	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1059	{
		1060	periodics_reschedule (EV_A);
		1061
		1062	/* adjust timers. this is easy, as the offset is the same for all */
		1063	for (i = 0; i < timercnt; ++i)
		1064	((WT)timers [i])->at += rt_now - mn_now;
		1065	}
		1066
		1067	mn_now = rt_now;
		1068	}
		1069	}
		1070
		1071	void
		1072	ev_ref (EV_P)
		1073	{
		1074	++activecnt;
		1075	}
		1076
		1077	void
		1078	ev_unref (EV_P)
		1079	{
		1080	--activecnt;
		1081	}
		1082
		1083	static int loop_done;
		1084
		1085	void
280	int ev_loop (int flags)	1086	ev_loop (EV_P_ int flags)
281	{	1087	{
282	double block;	1088	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;	1089	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
284		1090
285	do	1091	do
286	{	1092	{
		1093	/* queue check watchers (and execute them) */
		1094	if (expect_false (preparecnt))
		1095	{
		1096	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1097	call_pending (EV_A);
		1098	}
		1099
		1100	/* we might have forked, so reify kernel state if necessary */
		1101	if (expect_false (postfork))
		1102	loop_fork (EV_A);
		1103
287	/* update fd-related kernel structures */	1104	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1105	fd_reify (EV_A);
289		1106
290	/* calculate blocking time */	1107	/* calculate blocking time */
		1108
		1109	/* we only need this for !monotonic clock or timers, but as we basically
		1110	always have timers, we just calculate it always */
		1111	#if EV_USE_MONOTONIC
		1112	if (expect_true (have_monotonic))
		1113	time_update_monotonic (EV_A);
		1114	else
		1115	#endif
		1116	{
291	ev_now = ev_time ();	1117	rt_now = ev_time ();
		1118	mn_now = rt_now;
		1119	}
292		1120
293	if (flags & EVLOOP_NONBLOCK)	1121	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	1122	block = 0.;
295	else if (!timercnt)
296	block = MAX_BLOCKTIME;
297	else	1123	else
298	{	1124	{
		1125	block = MAX_BLOCKTIME;
		1126
		1127	if (timercnt)
		1128	{
299	block = timers [0]->at - ev_now + method_fudge;	1129	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
		1130	if (block > to) block = to;
		1131	}
		1132
		1133	if (periodiccnt)
		1134	{
		1135	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
		1136	if (block > to) block = to;
		1137	}
		1138
300	if (block < 0.) block = 0.;	1139	if (block < 0.) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	1140	}
303		1141
304	method_poll (block);	1142	method_poll (EV_A_ block);
305		1143
		1144	/* update rt_now, do magic */
		1145	time_update (EV_A);
		1146
306	/* put pending timers into pendign queue and reschedule them */	1147	/* queue pending timers and reschedule them */
307	timer_reify ();	1148	timers_reify (EV_A); /* relative timers called last */
		1149	periodics_reify (EV_A); /* absolute timers called first */
308		1150
309	ev_now = ev_time ();	1151	/* queue idle watchers unless io or timers are pending */
		1152	if (idlecnt && !any_pending (EV_A))
		1153	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1154
		1155	/* queue check watchers, to be executed first */
		1156	if (checkcnt)
		1157	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1158
310	call_pending ();	1159	call_pending (EV_A);
311	}	1160	}
312	while (!ev_loop_done);	1161	while (activecnt && !loop_done);
313	}
314		1162
315	static void	1163	if (loop_done != 2)
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1164	loop_done = 0;
		1165	}
		1166
		1167	void
		1168	ev_unloop (EV_P_ int how)
		1169	{
		1170	loop_done = how;
		1171	}
		1172
		1173	/*****************************************************************************/
		1174
		1175	inline void
		1176	wlist_add (WL *head, WL elem)
317	{	1177	{
318	elem->next = *head;	1178	elem->next = *head;
319	*head = elem;	1179	*head = elem;
320	}	1180	}
321		1181
322	static void	1182	inline void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1183	wlist_del (WL *head, WL elem)
324	{	1184	{
325	while (*head)	1185	while (*head)
326	{	1186	{
327	if (*head == elem)	1187	if (*head == elem)
328	{	1188	{
…		…
332		1192
333	head = &(*head)->next;	1193	head = &(*head)->next;
334	}	1194	}
335	}	1195	}
336		1196
337	static void	1197	inline void
338	ev_start (struct ev_watcher *w, int active)	1198	ev_clear_pending (EV_P_ W w)
339	{	1199	{
		1200	if (w->pending)
		1201	{
		1202	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	1203	w->pending = 0;
		1204	}
		1205	}
		1206
		1207	inline void
		1208	ev_start (EV_P_ W w, int active)
		1209	{
		1210	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1211	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1212
341	w->active = active;	1213	w->active = active;
		1214	ev_ref (EV_A);
342	}	1215	}
343		1216
344	static void	1217	inline void
345	ev_stop (struct ev_watcher *w)	1218	ev_stop (EV_P_ W w)
346	{	1219	{
347	if (w->pending)	1220	ev_unref (EV_A);
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	1221	w->active = 0;
351	/* nop */
352	}	1222	}
353		1223
		1224	/*****************************************************************************/
		1225
354	void	1226	void
355	evio_start (struct ev_io *w)	1227	ev_io_start (EV_P_ struct ev_io *w)
356	{	1228	{
		1229	int fd = w->fd;
		1230
357	if (ev_is_active (w))	1231	if (ev_is_active (w))
358	return;	1232	return;
359		1233
360	int fd = w->fd;	1234	assert (("ev_io_start called with negative fd", fd >= 0));
361		1235
362	ev_start ((struct ev_watcher *)w, 1);	1236	ev_start (EV_A_ (W)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1237	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1238	wlist_add ((WL *)&anfds[fd].head, (WL)w);
365		1239
366	++fdchangecnt;	1240	fd_change (EV_A_ fd);
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}	1241	}
370		1242
371	void	1243	void
372	evio_stop (struct ev_io *w)	1244	ev_io_stop (EV_P_ struct ev_io *w)
373	{	1245	{
		1246	ev_clear_pending (EV_A_ (W)w);
374	if (!ev_is_active (w))	1247	if (!ev_is_active (w))
375	return;	1248	return;
376		1249
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1250	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
378	ev_stop ((struct ev_watcher *)w);	1251	ev_stop (EV_A_ (W)w);
379		1252
380	++fdchangecnt;	1253	fd_change (EV_A_ w->fd);
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}	1254	}
384		1255
385	void	1256	void
386	evtimer_start (struct ev_timer *w)	1257	ev_timer_start (EV_P_ struct ev_timer *w)
387	{	1258	{
388	if (ev_is_active (w))	1259	if (ev_is_active (w))
389	return;	1260	return;
390		1261
391	if (w->is_abs)	1262	((WT)w)->at += mn_now;
		1263
		1264	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1265
		1266	ev_start (EV_A_ (W)w, ++timercnt);
		1267	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1268	timers [timercnt - 1] = w;
		1269	upheap ((WT *)timers, timercnt - 1);
		1270
		1271	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1272	}
		1273
		1274	void
		1275	ev_timer_stop (EV_P_ struct ev_timer *w)
		1276	{
		1277	ev_clear_pending (EV_A_ (W)w);
		1278	if (!ev_is_active (w))
		1279	return;
		1280
		1281	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1282
		1283	if (((W)w)->active < timercnt--)
		1284	{
		1285	timers [((W)w)->active - 1] = timers [timercnt];
		1286	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
392	{	1287	}
393	/* this formula differs from the one in timer_reify becuse we do not round up */	1288
		1289	((WT)w)->at = w->repeat;
		1290
		1291	ev_stop (EV_A_ (W)w);
		1292	}
		1293
		1294	void
		1295	ev_timer_again (EV_P_ struct ev_timer *w)
		1296	{
		1297	if (ev_is_active (w))
		1298	{
394	if (w->repeat)	1299	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1300	{
		1301	((WT)w)->at = mn_now + w->repeat;
		1302	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1303	}
		1304	else
		1305	ev_timer_stop (EV_A_ w);
		1306	}
		1307	else if (w->repeat)
		1308	ev_timer_start (EV_A_ w);
		1309	}
		1310
		1311	void
		1312	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1313	{
		1314	if (ev_is_active (w))
		1315	return;
		1316
		1317	if (w->reschedule_cb)
		1318	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1319	else if (w->interval)
396	}	1320	{
		1321	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1322	/* this formula differs from the one in periodic_reify because we do not always round up */
		1323	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1324	}
		1325
		1326	ev_start (EV_A_ (W)w, ++periodiccnt);
		1327	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1328	periodics [periodiccnt - 1] = w;
		1329	upheap ((WT *)periodics, periodiccnt - 1);
		1330
		1331	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1332	}
		1333
		1334	void
		1335	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1336	{
		1337	ev_clear_pending (EV_A_ (W)w);
		1338	if (!ev_is_active (w))
		1339	return;
		1340
		1341	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1342
		1343	if (((W)w)->active < periodiccnt--)
		1344	{
		1345	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1346	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1347	}
		1348
		1349	ev_stop (EV_A_ (W)w);
		1350	}
		1351
		1352	void
		1353	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1354	{
		1355	ev_periodic_stop (EV_A_ w);
		1356	ev_periodic_start (EV_A_ w);
		1357	}
		1358
		1359	void
		1360	ev_idle_start (EV_P_ struct ev_idle *w)
		1361	{
		1362	if (ev_is_active (w))
		1363	return;
		1364
		1365	ev_start (EV_A_ (W)w, ++idlecnt);
		1366	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1367	idles [idlecnt - 1] = w;
		1368	}
		1369
		1370	void
		1371	ev_idle_stop (EV_P_ struct ev_idle *w)
		1372	{
		1373	ev_clear_pending (EV_A_ (W)w);
		1374	if (ev_is_active (w))
		1375	return;
		1376
		1377	idles [((W)w)->active - 1] = idles [--idlecnt];
		1378	ev_stop (EV_A_ (W)w);
		1379	}
		1380
		1381	void
		1382	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1383	{
		1384	if (ev_is_active (w))
		1385	return;
		1386
		1387	ev_start (EV_A_ (W)w, ++preparecnt);
		1388	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1389	prepares [preparecnt - 1] = w;
		1390	}
		1391
		1392	void
		1393	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1394	{
		1395	ev_clear_pending (EV_A_ (W)w);
		1396	if (ev_is_active (w))
		1397	return;
		1398
		1399	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1400	ev_stop (EV_A_ (W)w);
		1401	}
		1402
		1403	void
		1404	ev_check_start (EV_P_ struct ev_check *w)
		1405	{
		1406	if (ev_is_active (w))
		1407	return;
		1408
		1409	ev_start (EV_A_ (W)w, ++checkcnt);
		1410	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1411	checks [checkcnt - 1] = w;
		1412	}
		1413
		1414	void
		1415	ev_check_stop (EV_P_ struct ev_check *w)
		1416	{
		1417	ev_clear_pending (EV_A_ (W)w);
		1418	if (ev_is_active (w))
		1419	return;
		1420
		1421	checks [((W)w)->active - 1] = checks [--checkcnt];
		1422	ev_stop (EV_A_ (W)w);
		1423	}
		1424
		1425	#ifndef SA_RESTART
		1426	# define SA_RESTART 0
		1427	#endif
		1428
		1429	void
		1430	ev_signal_start (EV_P_ struct ev_signal *w)
		1431	{
		1432	#if EV_MULTIPLICITY
		1433	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1434	#endif
		1435	if (ev_is_active (w))
		1436	return;
		1437
		1438	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1439
		1440	ev_start (EV_A_ (W)w, 1);
		1441	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1442	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1443
		1444	if (!((WL)w)->next)
		1445	{
		1446	#if WIN32
		1447	signal (w->signum, sighandler);
		1448	#else
		1449	struct sigaction sa;
		1450	sa.sa_handler = sighandler;
		1451	sigfillset (&sa.sa_mask);
		1452	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1453	sigaction (w->signum, &sa, 0);
		1454	#endif
		1455	}
		1456	}
		1457
		1458	void
		1459	ev_signal_stop (EV_P_ struct ev_signal *w)
		1460	{
		1461	ev_clear_pending (EV_A_ (W)w);
		1462	if (!ev_is_active (w))
		1463	return;
		1464
		1465	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1466	ev_stop (EV_A_ (W)w);
		1467
		1468	if (!signals [w->signum - 1].head)
		1469	signal (w->signum, SIG_DFL);
		1470	}
		1471
		1472	void
		1473	ev_child_start (EV_P_ struct ev_child *w)
		1474	{
		1475	#if EV_MULTIPLICITY
		1476	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1477	#endif
		1478	if (ev_is_active (w))
		1479	return;
		1480
		1481	ev_start (EV_A_ (W)w, 1);
		1482	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1483	}
		1484
		1485	void
		1486	ev_child_stop (EV_P_ struct ev_child *w)
		1487	{
		1488	ev_clear_pending (EV_A_ (W)w);
		1489	if (ev_is_active (w))
		1490	return;
		1491
		1492	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1493	ev_stop (EV_A_ (W)w);
		1494	}
		1495
		1496	/*****************************************************************************/
		1497
		1498	struct ev_once
		1499	{
		1500	struct ev_io io;
		1501	struct ev_timer to;
		1502	void (*cb)(int revents, void *arg);
		1503	void *arg;
		1504	};
		1505
		1506	static void
		1507	once_cb (EV_P_ struct ev_once *once, int revents)
		1508	{
		1509	void (*cb)(int revents, void *arg) = once->cb;
		1510	void *arg = once->arg;
		1511
		1512	ev_io_stop (EV_A_ &once->io);
		1513	ev_timer_stop (EV_A_ &once->to);
		1514	ev_free (once);
		1515
		1516	cb (revents, arg);
		1517	}
		1518
		1519	static void
		1520	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1521	{
		1522	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1523	}
		1524
		1525	static void
		1526	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1527	{
		1528	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1529	}
		1530
		1531	void
		1532	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1533	{
		1534	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1535
		1536	if (!once)
		1537	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
397	else	1538	else
398	w->at += ev_now;
399
400	ev_start ((struct ev_watcher *)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);
404	}
405
406	void
407	evtimer_stop (struct ev_timer *w)
408	{
409	if (!ev_is_active (w))
410	return;
411
412	if (w->active < timercnt--)
413	{
414	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);
416	}	1539	{
		1540	once->cb = cb;
		1541	once->arg = arg;
417		1542
418	ev_stop ((struct ev_watcher *)w);	1543	ev_watcher_init (&once->io, once_cb_io);
419	}	1544	if (fd >= 0)
		1545	{
		1546	ev_io_set (&once->io, fd, events);
		1547	ev_io_start (EV_A_ &once->io);
		1548	}
420		1549
421	void	1550	ev_watcher_init (&once->to, once_cb_to);
422	evsignal_start (struct ev_signal *w)	1551	if (timeout >= 0.)
423	{	1552	{
424	if (ev_is_active (w))	1553	ev_timer_set (&once->to, timeout, 0.);
425	return;	1554	ev_timer_start (EV_A_ &once->to);
426		1555	}
427	ev_start ((struct ev_watcher *)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
430	}
431
432	void
433	evsignal_stop (struct ev_signal *w)
434	{
435	if (!ev_is_active (w))
436	return;
437
438	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
439	ev_stop ((struct ev_watcher *)w);
440	}
441
442	/*****************************************************************************/
443	#if 1
444
445	static void
446	sin_cb (struct ev_io *w, int revents)
447	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
449	}
450
451	static void
452	ocb (struct ev_timer *w, int revents)
453	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
455	}
456
457	int main (void)
458	{
459	struct ev_io sin;
460
461	ev_init (0);
462
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);
465	evio_start (&sin);
466
467	struct ev_timer t[1000];
468
469	int i;
470	for (i = 0; i < 1000; ++i)
471	{	1556	}
472	struct ev_timer *w = t + i;
473	evw_init (w, ocb, i);
474	evtimer_set_rel (w, drand48 (), 0);
475	evtimer_start (w);
476	if (drand48 () < 0.5)
477	evtimer_stop (w);
478	}
479
480	ev_loop (0);
481
482	return 0;
483	}	1557	}
484		1558
485	#endif
486
487
488
489

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