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Comparing libev/ev.c (file contents):
Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.62 by root, Sun Nov 4 20:38:07 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 <unistd.h>
		60	#include <fcntl.h>
		61	#include <signal.h>
		62	#include <stddef.h>
3		63
4	#include <stdio.h>	64	#include <stdio.h>
5		65
6	#include <assert.h>	66	#include <assert.h>
7	#include <errno.h>	67	#include <errno.h>
		68	#include <sys/types.h>
		69	#ifndef WIN32
		70	# include <sys/wait.h>
		71	#endif
8	#include <sys/time.h>	72	#include <sys/time.h>
9	#include <time.h>	73	#include <time.h>
10		74
		75	/**/
		76
		77	#ifndef EV_USE_MONOTONIC
		78	# define EV_USE_MONOTONIC 1
		79	#endif
		80
		81	#ifndef EV_USE_SELECT
		82	# define EV_USE_SELECT 1
		83	#endif
		84
		85	#ifndef EV_USE_POLL
		86	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		87	#endif
		88
		89	#ifndef EV_USE_EPOLL
		90	# define EV_USE_EPOLL 0
		91	#endif
		92
		93	#ifndef EV_USE_KQUEUE
		94	# define EV_USE_KQUEUE 0
		95	#endif
		96
		97	#ifndef EV_USE_WIN32
		98	# ifdef WIN32
		99	# define EV_USE_WIN32 1
		100	# else
		101	# define EV_USE_WIN32 0
		102	# endif
		103	#endif
		104
		105	#ifndef EV_USE_REALTIME
		106	# define EV_USE_REALTIME 1
		107	#endif
		108
		109	/**/
		110
11	#ifdef CLOCK_MONOTONIC	111	#ifndef CLOCK_MONOTONIC
		112	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	113	# define EV_USE_MONOTONIC 0
13	#endif	114	#endif
14		115
15	#define HAVE_EPOLL 1	116	#ifndef CLOCK_REALTIME
		117	# undef EV_USE_REALTIME
16	#define HAVE_REALTIME 1	118	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 1	119	#endif
		120
		121	/**/
18		122
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	123	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	124	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		125	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		126	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
21		127
22	#include "ev.h"	128	#include "ev.h"
23		129
		130	#if __GNUC__ >= 3
		131	# define expect(expr,value) __builtin_expect ((expr),(value))
		132	# define inline inline
		133	#else
		134	# define expect(expr,value) (expr)
		135	# define inline static
		136	#endif
		137
		138	#define expect_false(expr) expect ((expr) != 0, 0)
		139	#define expect_true(expr) expect ((expr) != 0, 1)
		140
		141	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		142	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		143
24	struct ev_watcher {	144	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);	145	typedef struct ev_watcher_list *WL;
		146	typedef struct ev_watcher_time *WT;
		147
		148	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		149
		150	/*****************************************************************************/
		151
		152	typedef struct
		153	{
		154	struct ev_watcher_list *head;
		155	unsigned char events;
		156	unsigned char reify;
		157	} ANFD;
		158
		159	typedef struct
		160	{
		161	W w;
		162	int events;
		163	} ANPENDING;
		164
		165	#if EV_MULTIPLICITY
		166
		167	struct ev_loop
		168	{
		169	# define VAR(name,decl) decl;
		170	# include "ev_vars.h"
26	};	171	};
		172	# undef VAR
		173	# include "ev_wrap.h"
27		174
28	struct ev_watcher_list {	175	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		176
32	static ev_tstamp now, diff; /* monotonic clock */	177	# define VAR(name,decl) static decl;
33	ev_tstamp ev_now;	178	# include "ev_vars.h"
34	int ev_method;	179	# undef VAR
35		180
36	static int have_monotonic; /* runtime */	181	#endif
37		182
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	183	/*****************************************************************************/
39	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);
41		184
42	ev_tstamp	185	inline ev_tstamp
43	ev_time (void)	186	ev_time (void)
44	{	187	{
45	#if HAVE_REALTIME	188	#if EV_USE_REALTIME
46	struct timespec ts;	189	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	190	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	191	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	192	#else
50	struct timeval tv;	193	struct timeval tv;
51	gettimeofday (&tv, 0);	194	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	195	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	196	#endif
54	}	197	}
55		198
56	static ev_tstamp	199	inline ev_tstamp
57	get_clock (void)	200	get_clock (void)
58	{	201	{
59	#if HAVE_MONOTONIC	202	#if EV_USE_MONOTONIC
60	if (have_monotonic)	203	if (expect_true (have_monotonic))
61	{	204	{
62	struct timespec ts;	205	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	206	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	207	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	208	}
66	#endif	209	#endif
67		210
68	return ev_time ();	211	return ev_time ();
69	}	212	}
70		213
		214	ev_tstamp
		215	ev_now (EV_P)
		216	{
		217	return rt_now;
		218	}
		219
		220	#define array_roundsize(base,n) ((n) | 4 & ~3)
		221
71	#define array_needsize(base,cur,cnt,init) \	222	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	223	if (expect_false ((cnt) > cur)) \
73	{ \	224	{ \
74	int newcnt = cur ? cur << 1 : 16; \	225	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	226	do \
		227	{ \
		228	newcnt = array_roundsize (base, newcnt << 1); \
		229	} \
		230	while ((cnt) > newcnt); \
		231	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	232	base = realloc (base, sizeof (*base) * (newcnt)); \
77	init (base + cur, newcnt - cur); \	233	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	234	cur = newcnt; \
79	}	235	}
80		236
81	typedef struct	237	/*****************************************************************************/
82	{
83	struct ev_io *head;
84	unsigned char wev, rev; /* want, received event set */
85	} ANFD;
86
87	static ANFD *anfds;
88	static int anfdmax;
89
90	static int *fdchanges;
91	static int fdchangemax, fdchangecnt;
92		238
93	static void	239	static void
94	anfds_init (ANFD *base, int count)	240	anfds_init (ANFD *base, int count)
95	{	241	{
96	while (count--)	242	while (count--)
97	{	243	{
98	base->head = 0;	244	base->head = 0;
99	base->wev = base->rev = EV_NONE;	245	base->events = EV_NONE;
		246	base->reify = 0;
		247
100	++base;	248	++base;
101	}	249	}
102	}	250	}
103		251
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	252	static void
114	event (struct ev_watcher *w, int events)	253	event (EV_P_ W w, int events)
115	{	254	{
		255	if (w->pending)
		256	{
		257	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		258	return;
		259	}
		260
116	w->pending = ++pendingcnt;	261	w->pending = ++pendingcnt [ABSPRI (w)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	262	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
118	pendings [pendingcnt - 1].w = w;	263	pendings [ABSPRI (w)][w->pending - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	264	pendings [ABSPRI (w)][w->pending - 1].events = events;
120	}	265	}
121		266
122	static void	267	static void
		268	queue_events (EV_P_ W *events, int eventcnt, int type)
		269	{
		270	int i;
		271
		272	for (i = 0; i < eventcnt; ++i)
		273	event (EV_A_ events [i], type);
		274	}
		275
		276	static void
123	fd_event (int fd, int events)	277	fd_event (EV_P_ int fd, int events)
124	{	278	{
125	ANFD *anfd = anfds + fd;	279	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	280	struct ev_io *w;
127		281
128	for (w = anfd->head; w; w = w->next)	282	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	283	{
130	int ev = w->events & events;	284	int ev = w->events & events;
131		285
132	if (ev)	286	if (ev)
133	event ((struct ev_watcher *)w, ev);	287	event (EV_A_ (W)w, ev);
134	}
135	}
136
137	static struct ev_timer **atimers;
138	static int atimermax, atimercnt;
139
140	static struct ev_timer **rtimers;
141	static int rtimermax, rtimercnt;
142
143	static void
144	upheap (struct ev_timer **timers, int k)
145	{
146	struct ev_timer *w = timers [k];
147
148	while (k && timers [k >> 1]->at > w->at)
149	{	288	}
150	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;
152	k >>= 1;
153	}
154
155	timers [k] = w;
156	timers [k]->active = k + 1;
157
158	}	289	}
159		290
160	static void	291	/*****************************************************************************/
161	downheap (struct ev_timer **timers, int N, int k)
162	{
163	struct ev_timer *w = timers [k];
164		292
165	while (k < (N >> 1))
166	{
167	int j = k << 1;
168
169	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
170	++j;
171
172	if (w->at <= timers [j]->at)
173	break;
174
175	timers [k] = timers [j];
176	timers [k]->active = k + 1;
177	k = j;
178	}
179
180	timers [k] = w;
181	timers [k]->active = k + 1;
182	}
183
184	static struct ev_signal **signals;
185	static int signalmax;
186
187	static void	293	static void
188	signals_init (struct ev_signal **base, int count)	294	fd_reify (EV_P)
189	{
190	while (count--)
191	*base++ = 0;
192	}
193
194	#if HAVE_EPOLL
195	# include "ev_epoll.c"
196	#endif
197	#if HAVE_SELECT
198	# include "ev_select.c"
199	#endif
200
201	int ev_init (int flags)
202	{
203	#if HAVE_MONOTONIC
204	{
205	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;
208	}
209	#endif
210
211	ev_now = ev_time ();
212	now = get_clock ();
213	diff = ev_now - now;
214
215	#if HAVE_EPOLL
216	if (epoll_init (flags))
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223
224	ev_method = EVMETHOD_NONE;
225	return ev_method;
226	}
227
228	void ev_prefork (void)
229	{
230	}
231
232	void ev_postfork_parent (void)
233	{
234	}
235
236	void ev_postfork_child (void)
237	{
238	#if HAVE_EPOLL
239	if (ev_method == EVMETHOD_EPOLL)
240	epoll_postfork_child ();
241	#endif
242	}
243
244	static void
245	fd_reify (void)
246	{	295	{
247	int i;	296	int i;
248		297
249	for (i = 0; i < fdchangecnt; ++i)	298	for (i = 0; i < fdchangecnt; ++i)
250	{	299	{
251	int fd = fdchanges [i];	300	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	301	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	302	struct ev_io *w;
254		303
255	int wev = 0;	304	int events = 0;
256		305
257	for (w = anfd->head; w; w = w->next)	306	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	307	events |= w->events;
259		308
		309	anfd->reify = 0;
		310
260	if (anfd->wev != wev)	311	if (anfd->events != events)
261	{	312	{
262	method_modify (fd, anfd->wev, wev);	313	method_modify (EV_A_ fd, anfd->events, events);
263	anfd->wev = wev;	314	anfd->events = events;
264	}	315	}
265	}	316	}
266		317
267	fdchangecnt = 0;	318	fdchangecnt = 0;
268	}	319	}
269		320
270	static void	321	static void
271	call_pending ()	322	fd_change (EV_P_ int fd)
272	{	323	{
		324	if (anfds [fd].reify || fdchangecnt < 0)
		325	return;
		326
		327	anfds [fd].reify = 1;
		328
		329	++fdchangecnt;
		330	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		331	fdchanges [fdchangecnt - 1] = fd;
		332	}
		333
		334	static void
		335	fd_kill (EV_P_ int fd)
		336	{
		337	struct ev_io *w;
		338
		339	while ((w = (struct ev_io *)anfds [fd].head))
		340	{
		341	ev_io_stop (EV_A_ w);
		342	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		343	}
		344	}
		345
		346	/* called on EBADF to verify fds */
		347	static void
		348	fd_ebadf (EV_P)
		349	{
273	int i;	350	int fd;
274		351
275	for (i = 0; i < pendingcnt; ++i)	352	for (fd = 0; fd < anfdmax; ++fd)
		353	if (anfds [fd].events)
		354	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		355	fd_kill (EV_A_ fd);
		356	}
		357
		358	/* called on ENOMEM in select/poll to kill some fds and retry */
		359	static void
		360	fd_enomem (EV_P)
		361	{
		362	int fd;
		363
		364	for (fd = anfdmax; fd--; )
		365	if (anfds [fd].events)
276	{	366	{
277	ANPENDING *p = pendings + i;	367	close (fd);
		368	fd_kill (EV_A_ fd);
		369	return;
		370	}
		371	}
278		372
279	if (p->w)	373	/* susually called after fork if method needs to re-arm all fds from scratch */
		374	static void
		375	fd_rearm_all (EV_P)
		376	{
		377	int fd;
		378
		379	/* this should be highly optimised to not do anything but set a flag */
		380	for (fd = 0; fd < anfdmax; ++fd)
		381	if (anfds [fd].events)
		382	{
		383	anfds [fd].events = 0;
		384	fd_change (EV_A_ fd);
		385	}
		386	}
		387
		388	/*****************************************************************************/
		389
		390	static void
		391	upheap (WT *heap, int k)
		392	{
		393	WT w = heap [k];
		394
		395	while (k && heap [k >> 1]->at > w->at)
		396	{
		397	heap [k] = heap [k >> 1];
		398	((W)heap [k])->active = k + 1;
		399	k >>= 1;
		400	}
		401
		402	heap [k] = w;
		403	((W)heap [k])->active = k + 1;
		404
		405	}
		406
		407	static void
		408	downheap (WT *heap, int N, int k)
		409	{
		410	WT w = heap [k];
		411
		412	while (k < (N >> 1))
		413	{
		414	int j = k << 1;
		415
		416	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		417	++j;
		418
		419	if (w->at <= heap [j]->at)
		420	break;
		421
		422	heap [k] = heap [j];
		423	((W)heap [k])->active = k + 1;
		424	k = j;
		425	}
		426
		427	heap [k] = w;
		428	((W)heap [k])->active = k + 1;
		429	}
		430
		431	/*****************************************************************************/
		432
		433	typedef struct
		434	{
		435	struct ev_watcher_list *head;
		436	sig_atomic_t volatile gotsig;
		437	} ANSIG;
		438
		439	static ANSIG *signals;
		440	static int signalmax;
		441
		442	static int sigpipe [2];
		443	static sig_atomic_t volatile gotsig;
		444	static struct ev_io sigev;
		445
		446	static void
		447	signals_init (ANSIG *base, int count)
		448	{
		449	while (count--)
		450	{
		451	base->head = 0;
		452	base->gotsig = 0;
		453
		454	++base;
		455	}
		456	}
		457
		458	static void
		459	sighandler (int signum)
		460	{
		461	signals [signum - 1].gotsig = 1;
		462
		463	if (!gotsig)
		464	{
		465	int old_errno = errno;
		466	gotsig = 1;
		467	write (sigpipe [1], &signum, 1);
		468	errno = old_errno;
		469	}
		470	}
		471
		472	static void
		473	sigcb (EV_P_ struct ev_io *iow, int revents)
		474	{
		475	struct ev_watcher_list *w;
		476	int signum;
		477
		478	read (sigpipe [0], &revents, 1);
		479	gotsig = 0;
		480
		481	for (signum = signalmax; signum--; )
		482	if (signals [signum].gotsig)
		483	{
		484	signals [signum].gotsig = 0;
		485
		486	for (w = signals [signum].head; w; w = w->next)
		487	event (EV_A_ (W)w, EV_SIGNAL);
		488	}
		489	}
		490
		491	static void
		492	siginit (EV_P)
		493	{
		494	#ifndef WIN32
		495	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		496	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		497
		498	/* rather than sort out wether we really need nb, set it */
		499	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		500	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		501	#endif
		502
		503	ev_io_set (&sigev, sigpipe [0], EV_READ);
		504	ev_io_start (EV_A_ &sigev);
		505	ev_unref (EV_A); /* child watcher should not keep loop alive */
		506	}
		507
		508	/*****************************************************************************/
		509
		510	#ifndef WIN32
		511
		512	static struct ev_child *childs [PID_HASHSIZE];
		513	static struct ev_signal childev;
		514
		515	#ifndef WCONTINUED
		516	# define WCONTINUED 0
		517	#endif
		518
		519	static void
		520	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		521	{
		522	struct ev_child *w;
		523
		524	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		525	if (w->pid == pid || !w->pid)
		526	{
		527	w->priority = sw->priority; /* need to do it *now* */
		528	w->rpid = pid;
		529	w->rstatus = status;
		530	event (EV_A_ (W)w, EV_CHILD);
		531	}
		532	}
		533
		534	static void
		535	childcb (EV_P_ struct ev_signal *sw, int revents)
		536	{
		537	int pid, status;
		538
		539	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		540	{
		541	/* make sure we are called again until all childs have been reaped */
		542	event (EV_A_ (W)sw, EV_SIGNAL);
		543
		544	child_reap (EV_A_ sw, pid, pid, status);
		545	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		546	}
		547	}
		548
		549	#endif
		550
		551	/*****************************************************************************/
		552
		553	#if EV_USE_KQUEUE
		554	# include "ev_kqueue.c"
		555	#endif
		556	#if EV_USE_EPOLL
		557	# include "ev_epoll.c"
		558	#endif
		559	#if EV_USE_POLL
		560	# include "ev_poll.c"
		561	#endif
		562	#if EV_USE_SELECT
		563	# include "ev_select.c"
		564	#endif
		565
		566	int
		567	ev_version_major (void)
		568	{
		569	return EV_VERSION_MAJOR;
		570	}
		571
		572	int
		573	ev_version_minor (void)
		574	{
		575	return EV_VERSION_MINOR;
		576	}
		577
		578	/* return true if we are running with elevated privileges and should ignore env variables */
		579	static int
		580	enable_secure (void)
		581	{
		582	#ifdef WIN32
		583	return 0;
		584	#else
		585	return getuid () != geteuid ()
		586	|| getgid () != getegid ();
		587	#endif
		588	}
		589
		590	int
		591	ev_method (EV_P)
		592	{
		593	return method;
		594	}
		595
		596	static void
		597	loop_init (EV_P_ int methods)
		598	{
		599	if (!method)
		600	{
		601	#if EV_USE_MONOTONIC
		602	{
		603	struct timespec ts;
		604	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		605	have_monotonic = 1;
		606	}
		607	#endif
		608
		609	rt_now = ev_time ();
		610	mn_now = get_clock ();
		611	now_floor = mn_now;
		612	rtmn_diff = rt_now - mn_now;
		613
		614	if (methods == EVMETHOD_AUTO)
		615	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		616	methods = atoi (getenv ("LIBEV_METHODS"));
		617	else
		618	methods = EVMETHOD_ANY;
		619
		620	method = 0;
		621	#if EV_USE_WIN32
		622	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		623	#endif
		624	#if EV_USE_KQUEUE
		625	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		626	#endif
		627	#if EV_USE_EPOLL
		628	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		629	#endif
		630	#if EV_USE_POLL
		631	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		632	#endif
		633	#if EV_USE_SELECT
		634	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		635	#endif
		636	}
		637	}
		638
		639	void
		640	loop_destroy (EV_P)
		641	{
		642	#if EV_USE_WIN32
		643	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		644	#endif
		645	#if EV_USE_KQUEUE
		646	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		647	#endif
		648	#if EV_USE_EPOLL
		649	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		650	#endif
		651	#if EV_USE_POLL
		652	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		653	#endif
		654	#if EV_USE_SELECT
		655	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		656	#endif
		657
		658	method = 0;
		659	/*TODO*/
		660	}
		661
		662	void
		663	loop_fork (EV_P)
		664	{
		665	/*TODO*/
		666	#if EV_USE_EPOLL
		667	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		668	#endif
		669	#if EV_USE_KQUEUE
		670	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		671	#endif
		672	}
		673
		674	#if EV_MULTIPLICITY
		675	struct ev_loop *
		676	ev_loop_new (int methods)
		677	{
		678	struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop));
		679
		680	loop_init (EV_A_ methods);
		681
		682	if (ev_method (EV_A))
		683	return loop;
		684
		685	return 0;
		686	}
		687
		688	void
		689	ev_loop_destroy (EV_P)
		690	{
		691	loop_destroy (EV_A);
		692	free (loop);
		693	}
		694
		695	void
		696	ev_loop_fork (EV_P)
		697	{
		698	loop_fork (EV_A);
		699	}
		700
		701	#endif
		702
		703	#if EV_MULTIPLICITY
		704	struct ev_loop default_loop_struct;
		705	static struct ev_loop *default_loop;
		706
		707	struct ev_loop *
		708	#else
		709	static int default_loop;
		710
		711	int
		712	#endif
		713	ev_default_loop (int methods)
		714	{
		715	if (sigpipe [0] == sigpipe [1])
		716	if (pipe (sigpipe))
		717	return 0;
		718
		719	if (!default_loop)
		720	{
		721	#if EV_MULTIPLICITY
		722	struct ev_loop *loop = default_loop = &default_loop_struct;
		723	#else
		724	default_loop = 1;
		725	#endif
		726
		727	loop_init (EV_A_ methods);
		728
		729	if (ev_method (EV_A))
280	{	730	{
281	p->w->pending = 0;	731	ev_watcher_init (&sigev, sigcb);
282	p->w->cb (p->w, p->events);	732	ev_set_priority (&sigev, EV_MAXPRI);
		733	siginit (EV_A);
		734
		735	#ifndef WIN32
		736	ev_signal_init (&childev, childcb, SIGCHLD);
		737	ev_set_priority (&childev, EV_MAXPRI);
		738	ev_signal_start (EV_A_ &childev);
		739	ev_unref (EV_A); /* child watcher should not keep loop alive */
		740	#endif
283	}	741	}
		742	else
		743	default_loop = 0;
		744	}
		745
		746	return default_loop;
		747	}
		748
		749	void
		750	ev_default_destroy (void)
		751	{
		752	#if EV_MULTIPLICITY
		753	struct ev_loop *loop = default_loop;
		754	#endif
		755
		756	ev_ref (EV_A); /* child watcher */
		757	ev_signal_stop (EV_A_ &childev);
		758
		759	ev_ref (EV_A); /* signal watcher */
		760	ev_io_stop (EV_A_ &sigev);
		761
		762	close (sigpipe [0]); sigpipe [0] = 0;
		763	close (sigpipe [1]); sigpipe [1] = 0;
		764
		765	loop_destroy (EV_A);
		766	}
		767
		768	void
		769	ev_default_fork (void)
		770	{
		771	#if EV_MULTIPLICITY
		772	struct ev_loop *loop = default_loop;
		773	#endif
		774
		775	loop_fork (EV_A);
		776
		777	ev_io_stop (EV_A_ &sigev);
		778	close (sigpipe [0]);
		779	close (sigpipe [1]);
		780	pipe (sigpipe);
		781
		782	ev_ref (EV_A); /* signal watcher */
		783	siginit (EV_A);
		784	}
		785
		786	/*****************************************************************************/
		787
		788	static void
		789	call_pending (EV_P)
		790	{
		791	int pri;
		792
		793	for (pri = NUMPRI; pri--; )
		794	while (pendingcnt [pri])
		795	{
		796	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		797
		798	if (p->w)
		799	{
		800	p->w->pending = 0;
		801	p->w->cb (EV_A_ p->w, p->events);
		802	}
284	}	803	}
285
286	pendingcnt = 0;
287	}	804	}
288		805
289	static void	806	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	807	timers_reify (EV_P)
291	{	808	{
292	while (timercnt && timers [0]->at <= now)	809	while (timercnt && timers [0]->at <= mn_now)
293	{	810	{
294	struct ev_timer *w = timers [0];	811	struct ev_timer *w = timers [0];
		812
		813	assert (("inactive timer on timer heap detected", ev_is_active (w)));
295		814
296	/* first reschedule or stop timer */	815	/* first reschedule or stop timer */
297	if (w->repeat)	816	if (w->repeat)
298	{	817	{
299	if (w->is_abs)	818	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
300	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
301	else
302	w->at = now + w->repeat;	819	w->at = mn_now + w->repeat;
303
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	820	downheap ((WT *)timers, timercnt, 0);
307	}	821	}
308	else	822	else
		823	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		824
		825	event (EV_A_ (W)w, EV_TIMEOUT);
		826	}
		827	}
		828
		829	static void
		830	periodics_reify (EV_P)
		831	{
		832	while (periodiccnt && periodics [0]->at <= rt_now)
		833	{
		834	struct ev_periodic *w = periodics [0];
		835
		836	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		837
		838	/* first reschedule or stop timer */
		839	if (w->interval)
309	{	840	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	841	w->at += floor ((rt_now - w->at) / w->interval + 1.) * w->interval;
311	--timercnt; /* maybe pass by reference instead? */	842	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > rt_now));
		843	downheap ((WT *)periodics, periodiccnt, 0);
312	}	844	}
		845	else
		846	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		847
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	848	event (EV_A_ (W)w, EV_PERIODIC);
315	}	849	}
316	}	850	}
317		851
318	static void	852	static void
319	time_update ()	853	periodics_reschedule (EV_P)
320	{	854	{
321	int i;	855	int i;
322	ev_now = ev_time ();
323		856
324	if (have_monotonic)	857	/* adjust periodics after time jump */
		858	for (i = 0; i < periodiccnt; ++i)
325	{	859	{
326	ev_tstamp odiff = diff;	860	struct ev_periodic *w = periodics [i];
327		861
328	/* detecting time jumps is much more difficult */	862	if (w->interval)
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */
330	{	863	{
331	now = get_clock ();	864	ev_tstamp diff = ceil ((rt_now - w->at) / w->interval) * w->interval;
332	diff = ev_now - now;
333		865
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	866	if (fabs (diff) >= 1e-4)
335	return; /* all is well */	867	{
		868	ev_periodic_stop (EV_A_ w);
		869	ev_periodic_start (EV_A_ w);
336		870
337	ev_now = ev_time ();	871	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		872	}
338	}	873	}
		874	}
		875	}
339		876
340	/* time jump detected, reschedule atimers */	877	inline int
341	for (i = 0; i < atimercnt; ++i)	878	time_update_monotonic (EV_P)
		879	{
		880	mn_now = get_clock ();
		881
		882	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		883	{
		884	rt_now = rtmn_diff + mn_now;
		885	return 0;
		886	}
		887	else
		888	{
		889	now_floor = mn_now;
		890	rt_now = ev_time ();
		891	return 1;
		892	}
		893	}
		894
		895	static void
		896	time_update (EV_P)
		897	{
		898	int i;
		899
		900	#if EV_USE_MONOTONIC
		901	if (expect_true (have_monotonic))
		902	{
		903	if (time_update_monotonic (EV_A))
342	{	904	{
343	struct ev_timer *w = atimers [i];	905	ev_tstamp odiff = rtmn_diff;
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	906
		907	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		908	{
		909	rtmn_diff = rt_now - mn_now;
		910
		911	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		912	return; /* all is well */
		913
		914	rt_now = ev_time ();
		915	mn_now = get_clock ();
		916	now_floor = mn_now;
		917	}
		918
		919	periodics_reschedule (EV_A);
		920	/* no timer adjustment, as the monotonic clock doesn't jump */
		921	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
345	}	922	}
346	}	923	}
347	else	924	else
		925	#endif
348	{	926	{
349	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	927	rt_now = ev_time ();
350	/* time jump detected, adjust rtimers */	928
		929	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		930	{
		931	periodics_reschedule (EV_A);
		932
		933	/* adjust timers. this is easy, as the offset is the same for all */
351	for (i = 0; i < rtimercnt; ++i)	934	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	935	timers [i]->at += rt_now - mn_now;
		936	}
353		937
354	now = ev_now;	938	mn_now = rt_now;
355	}	939	}
356	}	940	}
357		941
358	int ev_loop_done;	942	void
		943	ev_ref (EV_P)
		944	{
		945	++activecnt;
		946	}
359		947
		948	void
		949	ev_unref (EV_P)
		950	{
		951	--activecnt;
		952	}
		953
		954	static int loop_done;
		955
		956	void
360	void ev_loop (int flags)	957	ev_loop (EV_P_ int flags)
361	{	958	{
362	double block;	959	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	960	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		961
365	do	962	do
366	{	963	{
		964	/* queue check watchers (and execute them) */
		965	if (expect_false (preparecnt))
		966	{
		967	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		968	call_pending (EV_A);
		969	}
		970
367	/* update fd-related kernel structures */	971	/* update fd-related kernel structures */
368	fd_reify ();	972	fd_reify (EV_A);
369		973
370	/* calculate blocking time */	974	/* calculate blocking time */
		975
		976	/* we only need this for !monotonic clockor timers, but as we basically
		977	always have timers, we just calculate it always */
		978	#if EV_USE_MONOTONIC
		979	if (expect_true (have_monotonic))
		980	time_update_monotonic (EV_A);
		981	else
		982	#endif
		983	{
		984	rt_now = ev_time ();
		985	mn_now = rt_now;
		986	}
		987
371	if (flags & EVLOOP_NONBLOCK)	988	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	989	block = 0.;
373	else	990	else
374	{	991	{
375	block = MAX_BLOCKTIME;	992	block = MAX_BLOCKTIME;
376		993
377	if (rtimercnt)	994	if (timercnt)
378	{	995	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	996	ev_tstamp to = timers [0]->at - mn_now + method_fudge;
380	if (block > to) block = to;	997	if (block > to) block = to;
381	}	998	}
382		999
383	if (atimercnt)	1000	if (periodiccnt)
384	{	1001	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1002	ev_tstamp to = periodics [0]->at - rt_now + method_fudge;
386	if (block > to) block = to;	1003	if (block > to) block = to;
387	}	1004	}
388		1005
389	if (block < 0.) block = 0.;	1006	if (block < 0.) block = 0.;
390	}	1007	}
391		1008
392	method_poll (block);	1009	method_poll (EV_A_ block);
393		1010
394	/* update ev_now, do magic */	1011	/* update rt_now, do magic */
395	time_update ();	1012	time_update (EV_A);
396		1013
397	/* put pending timers into pendign queue and reschedule them */	1014	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1015	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1016	periodics_reify (EV_A); /* absolute timers called first */
400	/* relative timers second */
401	timers_reify (rtimers, rtimercnt, now);
402		1017
		1018	/* queue idle watchers unless io or timers are pending */
		1019	if (!pendingcnt)
		1020	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1021
		1022	/* queue check watchers, to be executed first */
		1023	if (checkcnt)
		1024	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1025
403	call_pending ();	1026	call_pending (EV_A);
404	}	1027	}
405	while (!ev_loop_done);	1028	while (activecnt && !loop_done);
406	}
407		1029
408	static void	1030	if (loop_done != 2)
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1031	loop_done = 0;
		1032	}
		1033
		1034	void
		1035	ev_unloop (EV_P_ int how)
		1036	{
		1037	loop_done = how;
		1038	}
		1039
		1040	/*****************************************************************************/
		1041
		1042	inline void
		1043	wlist_add (WL *head, WL elem)
410	{	1044	{
411	elem->next = *head;	1045	elem->next = *head;
412	*head = elem;	1046	*head = elem;
413	}	1047	}
414		1048
415	static void	1049	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1050	wlist_del (WL *head, WL elem)
417	{	1051	{
418	while (*head)	1052	while (*head)
419	{	1053	{
420	if (*head == elem)	1054	if (*head == elem)
421	{	1055	{
…		…
425		1059
426	head = &(*head)->next;	1060	head = &(*head)->next;
427	}	1061	}
428	}	1062	}
429		1063
430	static void	1064	inline void
431	ev_start (struct ev_watcher *w, int active)	1065	ev_clear_pending (EV_P_ W w)
432	{	1066	{
		1067	if (w->pending)
		1068	{
		1069	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1070	w->pending = 0;
		1071	}
		1072	}
		1073
		1074	inline void
		1075	ev_start (EV_P_ W w, int active)
		1076	{
		1077	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1078	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1079
434	w->active = active;	1080	w->active = active;
		1081	ev_ref (EV_A);
435	}	1082	}
436		1083
437	static void	1084	inline void
438	ev_stop (struct ev_watcher *w)	1085	ev_stop (EV_P_ W w)
439	{	1086	{
440	if (w->pending)	1087	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1088	w->active = 0;
444	/* nop */
445	}	1089	}
446		1090
		1091	/*****************************************************************************/
		1092
447	void	1093	void
448	evio_start (struct ev_io *w)	1094	ev_io_start (EV_P_ struct ev_io *w)
449	{	1095	{
		1096	int fd = w->fd;
		1097
450	if (ev_is_active (w))	1098	if (ev_is_active (w))
451	return;	1099	return;
452		1100
453	int fd = w->fd;	1101	assert (("ev_io_start called with negative fd", fd >= 0));
454		1102
455	ev_start ((struct ev_watcher *)w, 1);	1103	ev_start (EV_A_ (W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1104	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1105	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		1106
459	++fdchangecnt;	1107	fd_change (EV_A_ fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1108	}
463		1109
464	void	1110	void
465	evio_stop (struct ev_io *w)	1111	ev_io_stop (EV_P_ struct ev_io *w)
466	{	1112	{
		1113	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1114	if (!ev_is_active (w))
468	return;	1115	return;
469		1116
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1117	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	1118	ev_stop (EV_A_ (W)w);
472		1119
473	++fdchangecnt;	1120	fd_change (EV_A_ w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	1121	}
477		1122
478	void	1123	void
479	evtimer_start (struct ev_timer *w)	1124	ev_timer_start (EV_P_ struct ev_timer *w)
480	{	1125	{
481	if (ev_is_active (w))	1126	if (ev_is_active (w))
482	return;	1127	return;
483		1128
484	if (w->is_abs)	1129	w->at += mn_now;
		1130
		1131	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1132
		1133	ev_start (EV_A_ (W)w, ++timercnt);
		1134	array_needsize (timers, timermax, timercnt, );
		1135	timers [timercnt - 1] = w;
		1136	upheap ((WT *)timers, timercnt - 1);
		1137
		1138	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1139	}
		1140
		1141	void
		1142	ev_timer_stop (EV_P_ struct ev_timer *w)
		1143	{
		1144	ev_clear_pending (EV_A_ (W)w);
		1145	if (!ev_is_active (w))
		1146	return;
		1147
		1148	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1149
		1150	if (((W)w)->active < timercnt--)
		1151	{
		1152	timers [((W)w)->active - 1] = timers [timercnt];
		1153	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
485	{	1154	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1155
		1156	w->at = w->repeat;
		1157
		1158	ev_stop (EV_A_ (W)w);
		1159	}
		1160
		1161	void
		1162	ev_timer_again (EV_P_ struct ev_timer *w)
		1163	{
		1164	if (ev_is_active (w))
		1165	{
487	if (w->repeat)	1166	if (w->repeat)
		1167	{
		1168	w->at = mn_now + w->repeat;
		1169	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1170	}
		1171	else
		1172	ev_timer_stop (EV_A_ w);
		1173	}
		1174	else if (w->repeat)
		1175	ev_timer_start (EV_A_ w);
		1176	}
		1177
		1178	void
		1179	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1180	{
		1181	if (ev_is_active (w))
		1182	return;
		1183
		1184	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1185
		1186	/* this formula differs from the one in periodic_reify because we do not always round up */
		1187	if (w->interval)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1188	w->at += ceil ((rt_now - w->at) / w->interval) * w->interval;
489		1189
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	1190	ev_start (EV_A_ (W)w, ++periodiccnt);
491	array_needsize (atimers, atimermax, atimercnt, );	1191	array_needsize (periodics, periodicmax, periodiccnt, );
492	atimers [atimercnt - 1] = w;	1192	periodics [periodiccnt - 1] = w;
493	upheap (atimers, atimercnt - 1);	1193	upheap ((WT *)periodics, periodiccnt - 1);
		1194
		1195	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1196	}
		1197
		1198	void
		1199	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1200	{
		1201	ev_clear_pending (EV_A_ (W)w);
		1202	if (!ev_is_active (w))
		1203	return;
		1204
		1205	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1206
		1207	if (((W)w)->active < periodiccnt--)
494	}	1208	{
		1209	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1210	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1211	}
		1212
		1213	ev_stop (EV_A_ (W)w);
		1214	}
		1215
		1216	void
		1217	ev_idle_start (EV_P_ struct ev_idle *w)
		1218	{
		1219	if (ev_is_active (w))
		1220	return;
		1221
		1222	ev_start (EV_A_ (W)w, ++idlecnt);
		1223	array_needsize (idles, idlemax, idlecnt, );
		1224	idles [idlecnt - 1] = w;
		1225	}
		1226
		1227	void
		1228	ev_idle_stop (EV_P_ struct ev_idle *w)
		1229	{
		1230	ev_clear_pending (EV_A_ (W)w);
		1231	if (ev_is_active (w))
		1232	return;
		1233
		1234	idles [((W)w)->active - 1] = idles [--idlecnt];
		1235	ev_stop (EV_A_ (W)w);
		1236	}
		1237
		1238	void
		1239	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1240	{
		1241	if (ev_is_active (w))
		1242	return;
		1243
		1244	ev_start (EV_A_ (W)w, ++preparecnt);
		1245	array_needsize (prepares, preparemax, preparecnt, );
		1246	prepares [preparecnt - 1] = w;
		1247	}
		1248
		1249	void
		1250	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1251	{
		1252	ev_clear_pending (EV_A_ (W)w);
		1253	if (ev_is_active (w))
		1254	return;
		1255
		1256	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1257	ev_stop (EV_A_ (W)w);
		1258	}
		1259
		1260	void
		1261	ev_check_start (EV_P_ struct ev_check *w)
		1262	{
		1263	if (ev_is_active (w))
		1264	return;
		1265
		1266	ev_start (EV_A_ (W)w, ++checkcnt);
		1267	array_needsize (checks, checkmax, checkcnt, );
		1268	checks [checkcnt - 1] = w;
		1269	}
		1270
		1271	void
		1272	ev_check_stop (EV_P_ struct ev_check *w)
		1273	{
		1274	ev_clear_pending (EV_A_ (W)w);
		1275	if (ev_is_active (w))
		1276	return;
		1277
		1278	checks [((W)w)->active - 1] = checks [--checkcnt];
		1279	ev_stop (EV_A_ (W)w);
		1280	}
		1281
		1282	#ifndef SA_RESTART
		1283	# define SA_RESTART 0
		1284	#endif
		1285
		1286	void
		1287	ev_signal_start (EV_P_ struct ev_signal *w)
		1288	{
		1289	#if EV_MULTIPLICITY
		1290	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1291	#endif
		1292	if (ev_is_active (w))
		1293	return;
		1294
		1295	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1296
		1297	ev_start (EV_A_ (W)w, 1);
		1298	array_needsize (signals, signalmax, w->signum, signals_init);
		1299	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1300
		1301	if (!w->next)
		1302	{
		1303	struct sigaction sa;
		1304	sa.sa_handler = sighandler;
		1305	sigfillset (&sa.sa_mask);
		1306	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1307	sigaction (w->signum, &sa, 0);
		1308	}
		1309	}
		1310
		1311	void
		1312	ev_signal_stop (EV_P_ struct ev_signal *w)
		1313	{
		1314	ev_clear_pending (EV_A_ (W)w);
		1315	if (!ev_is_active (w))
		1316	return;
		1317
		1318	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1319	ev_stop (EV_A_ (W)w);
		1320
		1321	if (!signals [w->signum - 1].head)
		1322	signal (w->signum, SIG_DFL);
		1323	}
		1324
		1325	void
		1326	ev_child_start (EV_P_ struct ev_child *w)
		1327	{
		1328	#if EV_MULTIPLICITY
		1329	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1330	#endif
		1331	if (ev_is_active (w))
		1332	return;
		1333
		1334	ev_start (EV_A_ (W)w, 1);
		1335	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1336	}
		1337
		1338	void
		1339	ev_child_stop (EV_P_ struct ev_child *w)
		1340	{
		1341	ev_clear_pending (EV_A_ (W)w);
		1342	if (ev_is_active (w))
		1343	return;
		1344
		1345	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1346	ev_stop (EV_A_ (W)w);
		1347	}
		1348
		1349	/*****************************************************************************/
		1350
		1351	struct ev_once
		1352	{
		1353	struct ev_io io;
		1354	struct ev_timer to;
		1355	void (*cb)(int revents, void *arg);
		1356	void *arg;
		1357	};
		1358
		1359	static void
		1360	once_cb (EV_P_ struct ev_once *once, int revents)
		1361	{
		1362	void (*cb)(int revents, void *arg) = once->cb;
		1363	void *arg = once->arg;
		1364
		1365	ev_io_stop (EV_A_ &once->io);
		1366	ev_timer_stop (EV_A_ &once->to);
		1367	free (once);
		1368
		1369	cb (revents, arg);
		1370	}
		1371
		1372	static void
		1373	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1374	{
		1375	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1376	}
		1377
		1378	static void
		1379	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1380	{
		1381	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1382	}
		1383
		1384	void
		1385	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1386	{
		1387	struct ev_once *once = malloc (sizeof (struct ev_once));
		1388
		1389	if (!once)
		1390	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
495	else	1391	else
496	{	1392	{
497	w->at += now;	1393	once->cb = cb;
		1394	once->arg = arg;
498		1395
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1396	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1397	if (fd >= 0)
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}
504
505	}
506
507	void
508	evtimer_stop (struct ev_timer *w)
509	{
510	if (!ev_is_active (w))
511	return;
512
513	if (w->is_abs)
514	{
515	if (w->active < atimercnt--)
516	{	1398	{
517	atimers [w->active - 1] = atimers [atimercnt];	1399	ev_io_set (&once->io, fd, events);
518	downheap (atimers, atimercnt, w->active - 1);	1400	ev_io_start (EV_A_ &once->io);
519	}	1401	}
520	}	1402
521	else	1403	ev_watcher_init (&once->to, once_cb_to);
522	{	1404	if (timeout >= 0.)
523	if (w->active < rtimercnt--)
524	{	1405	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1406	ev_timer_set (&once->to, timeout, 0.);
526	downheap (rtimers, rtimercnt, w->active - 1);	1407	ev_timer_start (EV_A_ &once->to);
527	}	1408	}
528	}	1409	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1410	}
532		1411
533	void
534	evsignal_start (struct ev_signal *w)
535	{
536	if (ev_is_active (w))
537	return;
538
539	ev_start ((struct ev_watcher *)w, 1);
540	array_needsize (signals, signalmax, w->signum, signals_init);
541	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
542	}
543
544	void
545	evsignal_stop (struct ev_signal *w)
546	{
547	if (!ev_is_active (w))
548	return;
549
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
551	ev_stop ((struct ev_watcher *)w);
552	}
553
554	/*****************************************************************************/
555	#if 1
556
557	static void
558	sin_cb (struct ev_io *w, int revents)
559	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
561	}
562
563	static void
564	ocb (struct ev_timer *w, int revents)
565	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
567	evtimer_stop (w);
568	evtimer_start (w);
569	}
570
571	int main (void)
572	{
573	struct ev_io sin;
574
575	ev_init (0);
576
577	evw_init (&sin, sin_cb, 55);
578	evio_set (&sin, 0, EV_READ);
579	evio_start (&sin);
580
581	struct ev_timer t[10000];
582
583	#if 1
584	int i;
585	for (i = 0; i < 10000; ++i)
586	{
587	struct ev_timer *w = t + i;
588	evw_init (w, ocb, i);
589	evtimer_set_abs (w, drand48 (), 0.99775533);
590	evtimer_start (w);
591	if (drand48 () < 0.5)
592	evtimer_stop (w);
593	}
594	#endif
595
596	struct ev_timer t1;
597	evw_init (&t1, ocb, 0);
598	evtimer_set_abs (&t1, 5, 10);
599	evtimer_start (&t1);
600
601	ev_loop (0);
602
603	return 0;
604	}
605
606	#endif
607
608
609
610

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