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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 1.61 by root, Sun Nov 4 19:45:09 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_REALTIME
		98	# define EV_USE_REALTIME 1
		99	#endif
		100
		101	/**/
		102
11	#ifdef CLOCK_MONOTONIC	103	#ifndef CLOCK_MONOTONIC
		104	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	105	# define EV_USE_MONOTONIC 0
13	#endif	106	#endif
14		107
15	#define HAVE_EPOLL 1	108	#ifndef CLOCK_REALTIME
		109	# undef EV_USE_REALTIME
16	#define HAVE_REALTIME 1	110	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 1	111	#endif
		112
		113	/**/
18		114
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	115	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	116	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		117	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		118	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
21		119
22	#include "ev.h"	120	#include "ev.h"
23		121
		122	#if __GNUC__ >= 3
		123	# define expect(expr,value) __builtin_expect ((expr),(value))
		124	# define inline inline
		125	#else
		126	# define expect(expr,value) (expr)
		127	# define inline static
		128	#endif
		129
		130	#define expect_false(expr) expect ((expr) != 0, 0)
		131	#define expect_true(expr) expect ((expr) != 0, 1)
		132
		133	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		134	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		135
24	struct ev_watcher {	136	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);	137	typedef struct ev_watcher_list *WL;
		138	typedef struct ev_watcher_time *WT;
		139
		140	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		141
		142	/*****************************************************************************/
		143
		144	typedef struct
		145	{
		146	struct ev_watcher_list *head;
		147	unsigned char events;
		148	unsigned char reify;
		149	} ANFD;
		150
		151	typedef struct
		152	{
		153	W w;
		154	int events;
		155	} ANPENDING;
		156
		157	#if EV_MULTIPLICITY
		158
		159	struct ev_loop
		160	{
		161	# define VAR(name,decl) decl;
		162	# include "ev_vars.h"
26	};	163	};
		164	# undef VAR
		165	# include "ev_wrap.h"
27		166
28	struct ev_watcher_list {	167	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		168
32	static ev_tstamp now, diff; /* monotonic clock */	169	# define VAR(name,decl) static decl;
33	ev_tstamp ev_now;	170	# include "ev_vars.h"
34	int ev_method;	171	# undef VAR
35		172
36	static int have_monotonic; /* runtime */	173	#endif
37		174
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	175	/*****************************************************************************/
39	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);
41		176
42	ev_tstamp	177	inline ev_tstamp
43	ev_time (void)	178	ev_time (void)
44	{	179	{
45	#if HAVE_REALTIME	180	#if EV_USE_REALTIME
46	struct timespec ts;	181	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	182	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	183	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	184	#else
50	struct timeval tv;	185	struct timeval tv;
51	gettimeofday (&tv, 0);	186	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	187	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	188	#endif
54	}	189	}
55		190
56	static ev_tstamp	191	inline ev_tstamp
57	get_clock (void)	192	get_clock (void)
58	{	193	{
59	#if HAVE_MONOTONIC	194	#if EV_USE_MONOTONIC
60	if (have_monotonic)	195	if (expect_true (have_monotonic))
61	{	196	{
62	struct timespec ts;	197	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	198	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	199	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	200	}
66	#endif	201	#endif
67		202
68	return ev_time ();	203	return ev_time ();
69	}	204	}
70		205
		206	ev_tstamp
		207	ev_now (EV_P)
		208	{
		209	return rt_now;
		210	}
		211
		212	#define array_roundsize(base,n) ((n) | 4 & ~3)
		213
71	#define array_needsize(base,cur,cnt,init) \	214	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	215	if (expect_false ((cnt) > cur)) \
73	{ \	216	{ \
74	int newcnt = cur ? cur << 1 : 16; \	217	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	218	do \
		219	{ \
		220	newcnt = array_roundsize (base, newcnt << 1); \
		221	} \
		222	while ((cnt) > newcnt); \
		223	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	224	base = realloc (base, sizeof (*base) * (newcnt)); \
77	init (base + cur, newcnt - cur); \	225	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	226	cur = newcnt; \
79	}	227	}
80		228
81	typedef struct	229	/*****************************************************************************/
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		230
93	static void	231	static void
94	anfds_init (ANFD *base, int count)	232	anfds_init (ANFD *base, int count)
95	{	233	{
96	while (count--)	234	while (count--)
97	{	235	{
98	base->head = 0;	236	base->head = 0;
99	base->wev = base->rev = EV_NONE;	237	base->events = EV_NONE;
		238	base->reify = 0;
		239
100	++base;	240	++base;
101	}	241	}
102	}	242	}
103		243
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	244	static void
114	event (struct ev_watcher *w, int events)	245	event (EV_P_ W w, int events)
115	{	246	{
		247	if (w->pending)
		248	{
		249	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		250	return;
		251	}
		252
116	w->pending = ++pendingcnt;	253	w->pending = ++pendingcnt [ABSPRI (w)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	254	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
118	pendings [pendingcnt - 1].w = w;	255	pendings [ABSPRI (w)][w->pending - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	256	pendings [ABSPRI (w)][w->pending - 1].events = events;
120	}	257	}
121		258
122	static void	259	static void
		260	queue_events (EV_P_ W *events, int eventcnt, int type)
		261	{
		262	int i;
		263
		264	for (i = 0; i < eventcnt; ++i)
		265	event (EV_A_ events [i], type);
		266	}
		267
		268	static void
123	fd_event (int fd, int events)	269	fd_event (EV_P_ int fd, int events)
124	{	270	{
125	ANFD *anfd = anfds + fd;	271	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	272	struct ev_io *w;
127		273
128	for (w = anfd->head; w; w = w->next)	274	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	275	{
130	int ev = w->events & events;	276	int ev = w->events & events;
131		277
132	if (ev)	278	if (ev)
133	event ((struct ev_watcher *)w, ev);	279	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	{	280	}
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	}	281	}
159		282
160	static void	283	/*****************************************************************************/
161	downheap (struct ev_timer **timers, int N, int k)
162	{
163	struct ev_timer *w = timers [k];
164		284
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	285	static void
188	signals_init (struct ev_signal **base, int count)	286	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	{	287	{
247	int i;	288	int i;
248		289
249	for (i = 0; i < fdchangecnt; ++i)	290	for (i = 0; i < fdchangecnt; ++i)
250	{	291	{
251	int fd = fdchanges [i];	292	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	293	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	294	struct ev_io *w;
254		295
255	int wev = 0;	296	int events = 0;
256		297
257	for (w = anfd->head; w; w = w->next)	298	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	299	events |= w->events;
259		300
		301	anfd->reify = 0;
		302
260	if (anfd->wev != wev)	303	if (anfd->events != events)
261	{	304	{
262	method_modify (fd, anfd->wev, wev);	305	method_modify (EV_A_ fd, anfd->events, events);
263	anfd->wev = wev;	306	anfd->events = events;
264	}	307	}
265	}	308	}
266		309
267	fdchangecnt = 0;	310	fdchangecnt = 0;
268	}	311	}
269		312
270	static void	313	static void
271	call_pending ()	314	fd_change (EV_P_ int fd)
272	{	315	{
		316	if (anfds [fd].reify || fdchangecnt < 0)
		317	return;
		318
		319	anfds [fd].reify = 1;
		320
		321	++fdchangecnt;
		322	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		323	fdchanges [fdchangecnt - 1] = fd;
		324	}
		325
		326	static void
		327	fd_kill (EV_P_ int fd)
		328	{
		329	struct ev_io *w;
		330
		331	while ((w = (struct ev_io *)anfds [fd].head))
		332	{
		333	ev_io_stop (EV_A_ w);
		334	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		335	}
		336	}
		337
		338	/* called on EBADF to verify fds */
		339	static void
		340	fd_ebadf (EV_P)
		341	{
273	int i;	342	int fd;
274		343
275	for (i = 0; i < pendingcnt; ++i)	344	for (fd = 0; fd < anfdmax; ++fd)
		345	if (anfds [fd].events)
		346	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		347	fd_kill (EV_A_ fd);
		348	}
		349
		350	/* called on ENOMEM in select/poll to kill some fds and retry */
		351	static void
		352	fd_enomem (EV_P)
		353	{
		354	int fd = anfdmax;
		355
		356	while (fd--)
		357	if (anfds [fd].events)
276	{	358	{
277	ANPENDING *p = pendings + i;	359	close (fd);
		360	fd_kill (EV_A_ fd);
		361	return;
		362	}
		363	}
278		364
279	if (p->w)	365	/* susually called after fork if method needs to re-arm all fds from scratch */
		366	static void
		367	fd_rearm_all (EV_P)
		368	{
		369	int fd;
		370
		371	/* this should be highly optimised to not do anything but set a flag */
		372	for (fd = 0; fd < anfdmax; ++fd)
		373	if (anfds [fd].events)
		374	{
		375	anfds [fd].events = 0;
		376	fd_change (EV_A_ fd);
		377	}
		378	}
		379
		380	/*****************************************************************************/
		381
		382	static void
		383	upheap (WT *heap, int k)
		384	{
		385	WT w = heap [k];
		386
		387	while (k && heap [k >> 1]->at > w->at)
		388	{
		389	heap [k] = heap [k >> 1];
		390	heap [k]->active = k + 1;
		391	k >>= 1;
		392	}
		393
		394	heap [k] = w;
		395	heap [k]->active = k + 1;
		396
		397	}
		398
		399	static void
		400	downheap (WT *heap, int N, int k)
		401	{
		402	WT w = heap [k];
		403
		404	while (k < (N >> 1))
		405	{
		406	int j = k << 1;
		407
		408	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		409	++j;
		410
		411	if (w->at <= heap [j]->at)
		412	break;
		413
		414	heap [k] = heap [j];
		415	heap [k]->active = k + 1;
		416	k = j;
		417	}
		418
		419	heap [k] = w;
		420	heap [k]->active = k + 1;
		421	}
		422
		423	/*****************************************************************************/
		424
		425	typedef struct
		426	{
		427	struct ev_watcher_list *head;
		428	sig_atomic_t volatile gotsig;
		429	} ANSIG;
		430
		431	static ANSIG *signals;
		432	static int signalmax;
		433
		434	static int sigpipe [2];
		435	static sig_atomic_t volatile gotsig;
		436	static struct ev_io sigev;
		437
		438	static void
		439	signals_init (ANSIG *base, int count)
		440	{
		441	while (count--)
		442	{
		443	base->head = 0;
		444	base->gotsig = 0;
		445
		446	++base;
		447	}
		448	}
		449
		450	static void
		451	sighandler (int signum)
		452	{
		453	signals [signum - 1].gotsig = 1;
		454
		455	if (!gotsig)
		456	{
		457	int old_errno = errno;
		458	gotsig = 1;
		459	write (sigpipe [1], &signum, 1);
		460	errno = old_errno;
		461	}
		462	}
		463
		464	static void
		465	sigcb (EV_P_ struct ev_io *iow, int revents)
		466	{
		467	struct ev_watcher_list *w;
		468	int signum;
		469
		470	read (sigpipe [0], &revents, 1);
		471	gotsig = 0;
		472
		473	for (signum = signalmax; signum--; )
		474	if (signals [signum].gotsig)
		475	{
		476	signals [signum].gotsig = 0;
		477
		478	for (w = signals [signum].head; w; w = w->next)
		479	event (EV_A_ (W)w, EV_SIGNAL);
		480	}
		481	}
		482
		483	static void
		484	siginit (EV_P)
		485	{
		486	#ifndef WIN32
		487	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		488	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		489
		490	/* rather than sort out wether we really need nb, set it */
		491	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		492	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		493	#endif
		494
		495	ev_io_set (&sigev, sigpipe [0], EV_READ);
		496	ev_io_start (EV_A_ &sigev);
		497	ev_unref (EV_A); /* child watcher should not keep loop alive */
		498	}
		499
		500	/*****************************************************************************/
		501
		502	#ifndef WIN32
		503
		504	static struct ev_child *childs [PID_HASHSIZE];
		505	static struct ev_signal childev;
		506
		507	#ifndef WCONTINUED
		508	# define WCONTINUED 0
		509	#endif
		510
		511	static void
		512	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		513	{
		514	struct ev_child *w;
		515
		516	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		517	if (w->pid == pid || !w->pid)
		518	{
		519	w->priority = sw->priority; /* need to do it *now* */
		520	w->rpid = pid;
		521	w->rstatus = status;
		522	event (EV_A_ (W)w, EV_CHILD);
		523	}
		524	}
		525
		526	static void
		527	childcb (EV_P_ struct ev_signal *sw, int revents)
		528	{
		529	int pid, status;
		530
		531	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		532	{
		533	/* make sure we are called again until all childs have been reaped */
		534	event (EV_A_ (W)sw, EV_SIGNAL);
		535
		536	child_reap (EV_A_ sw, pid, pid, status);
		537	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		538	}
		539	}
		540
		541	#endif
		542
		543	/*****************************************************************************/
		544
		545	#if EV_USE_KQUEUE
		546	# include "ev_kqueue.c"
		547	#endif
		548	#if EV_USE_EPOLL
		549	# include "ev_epoll.c"
		550	#endif
		551	#if EV_USE_POLL
		552	# include "ev_poll.c"
		553	#endif
		554	#if EV_USE_SELECT
		555	# include "ev_select.c"
		556	#endif
		557
		558	int
		559	ev_version_major (void)
		560	{
		561	return EV_VERSION_MAJOR;
		562	}
		563
		564	int
		565	ev_version_minor (void)
		566	{
		567	return EV_VERSION_MINOR;
		568	}
		569
		570	/* return true if we are running with elevated privileges and should ignore env variables */
		571	static int
		572	enable_secure (void)
		573	{
		574	#ifdef WIN32
		575	return 0;
		576	#else
		577	return getuid () != geteuid ()
		578	|| getgid () != getegid ();
		579	#endif
		580	}
		581
		582	int
		583	ev_method (EV_P)
		584	{
		585	return method;
		586	}
		587
		588	static void
		589	loop_init (EV_P_ int methods)
		590	{
		591	if (!method)
		592	{
		593	#if EV_USE_MONOTONIC
		594	{
		595	struct timespec ts;
		596	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		597	have_monotonic = 1;
		598	}
		599	#endif
		600
		601	rt_now = ev_time ();
		602	mn_now = get_clock ();
		603	now_floor = mn_now;
		604	rtmn_diff = rt_now - mn_now;
		605
		606	if (methods == EVMETHOD_AUTO)
		607	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		608	methods = atoi (getenv ("LIBEV_METHODS"));
		609	else
		610	methods = EVMETHOD_ANY;
		611
		612	method = 0;
		613	#if EV_USE_KQUEUE
		614	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		615	#endif
		616	#if EV_USE_EPOLL
		617	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		618	#endif
		619	#if EV_USE_POLL
		620	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		621	#endif
		622	#if EV_USE_SELECT
		623	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		624	#endif
		625	}
		626	}
		627
		628	void
		629	loop_destroy (EV_P)
		630	{
		631	#if EV_USE_KQUEUE
		632	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		633	#endif
		634	#if EV_USE_EPOLL
		635	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		636	#endif
		637	#if EV_USE_POLL
		638	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		639	#endif
		640	#if EV_USE_SELECT
		641	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		642	#endif
		643
		644	method = 0;
		645	/*TODO*/
		646	}
		647
		648	void
		649	loop_fork (EV_P)
		650	{
		651	/*TODO*/
		652	#if EV_USE_EPOLL
		653	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		654	#endif
		655	#if EV_USE_KQUEUE
		656	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		657	#endif
		658	}
		659
		660	#if EV_MULTIPLICITY
		661	struct ev_loop *
		662	ev_loop_new (int methods)
		663	{
		664	struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop));
		665
		666	loop_init (EV_A_ methods);
		667
		668	if (ev_method (EV_A))
		669	return loop;
		670
		671	return 0;
		672	}
		673
		674	void
		675	ev_loop_destroy (EV_P)
		676	{
		677	loop_destroy (EV_A);
		678	free (loop);
		679	}
		680
		681	void
		682	ev_loop_fork (EV_P)
		683	{
		684	loop_fork (EV_A);
		685	}
		686
		687	#endif
		688
		689	#if EV_MULTIPLICITY
		690	struct ev_loop default_loop_struct;
		691	static struct ev_loop *default_loop;
		692
		693	struct ev_loop *
		694	#else
		695	static int default_loop;
		696
		697	int
		698	#endif
		699	ev_default_loop (int methods)
		700	{
		701	if (sigpipe [0] == sigpipe [1])
		702	if (pipe (sigpipe))
		703	return 0;
		704
		705	if (!default_loop)
		706	{
		707	#if EV_MULTIPLICITY
		708	struct ev_loop *loop = default_loop = &default_loop_struct;
		709	#else
		710	default_loop = 1;
		711	#endif
		712
		713	loop_init (EV_A_ methods);
		714
		715	if (ev_method (EV_A))
280	{	716	{
281	p->w->pending = 0;	717	ev_watcher_init (&sigev, sigcb);
282	p->w->cb (p->w, p->events);	718	ev_set_priority (&sigev, EV_MAXPRI);
		719	siginit (EV_A);
		720
		721	#ifndef WIN32
		722	ev_signal_init (&childev, childcb, SIGCHLD);
		723	ev_set_priority (&childev, EV_MAXPRI);
		724	ev_signal_start (EV_A_ &childev);
		725	ev_unref (EV_A); /* child watcher should not keep loop alive */
		726	#endif
283	}	727	}
		728	else
		729	default_loop = 0;
		730	}
		731
		732	return default_loop;
		733	}
		734
		735	void
		736	ev_default_destroy (void)
		737	{
		738	#if EV_MULTIPLICITY
		739	struct ev_loop *loop = default_loop;
		740	#endif
		741
		742	ev_ref (EV_A); /* child watcher */
		743	ev_signal_stop (EV_A_ &childev);
		744
		745	ev_ref (EV_A); /* signal watcher */
		746	ev_io_stop (EV_A_ &sigev);
		747
		748	close (sigpipe [0]); sigpipe [0] = 0;
		749	close (sigpipe [1]); sigpipe [1] = 0;
		750
		751	loop_destroy (EV_A);
		752	}
		753
		754	void
		755	ev_default_fork (void)
		756	{
		757	#if EV_MULTIPLICITY
		758	struct ev_loop *loop = default_loop;
		759	#endif
		760
		761	loop_fork (EV_A);
		762
		763	ev_io_stop (EV_A_ &sigev);
		764	close (sigpipe [0]);
		765	close (sigpipe [1]);
		766	pipe (sigpipe);
		767
		768	ev_ref (EV_A); /* signal watcher */
		769	siginit (EV_A);
		770	}
		771
		772	/*****************************************************************************/
		773
		774	static void
		775	call_pending (EV_P)
		776	{
		777	int pri;
		778
		779	for (pri = NUMPRI; pri--; )
		780	while (pendingcnt [pri])
		781	{
		782	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		783
		784	if (p->w)
		785	{
		786	p->w->pending = 0;
		787	p->w->cb (EV_A_ p->w, p->events);
		788	}
284	}	789	}
285
286	pendingcnt = 0;
287	}	790	}
288		791
289	static void	792	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	793	timers_reify (EV_P)
291	{	794	{
292	while (timercnt && timers [0]->at <= now)	795	while (timercnt && timers [0]->at <= mn_now)
293	{	796	{
294	struct ev_timer *w = timers [0];	797	struct ev_timer *w = timers [0];
		798
		799	assert (("inactive timer on timer heap detected", ev_is_active (w)));
295		800
296	/* first reschedule or stop timer */	801	/* first reschedule or stop timer */
297	if (w->repeat)	802	if (w->repeat)
298	{	803	{
299	if (w->is_abs)	804	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;	805	w->at = mn_now + w->repeat;
303
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	806	downheap ((WT *)timers, timercnt, 0);
307	}	807	}
308	else	808	else
		809	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		810
		811	event (EV_A_ (W)w, EV_TIMEOUT);
		812	}
		813	}
		814
		815	static void
		816	periodics_reify (EV_P)
		817	{
		818	while (periodiccnt && periodics [0]->at <= rt_now)
		819	{
		820	struct ev_periodic *w = periodics [0];
		821
		822	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		823
		824	/* first reschedule or stop timer */
		825	if (w->interval)
309	{	826	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	827	w->at += floor ((rt_now - w->at) / w->interval + 1.) * w->interval;
311	--timercnt; /* maybe pass by reference instead? */	828	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > rt_now));
		829	downheap ((WT *)periodics, periodiccnt, 0);
312	}	830	}
		831	else
		832	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		833
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	834	event (EV_A_ (W)w, EV_PERIODIC);
315	}	835	}
316	}	836	}
317		837
318	static void	838	static void
319	time_update ()	839	periodics_reschedule (EV_P)
320	{	840	{
321	int i;	841	int i;
322	ev_now = ev_time ();
323		842
324	if (have_monotonic)	843	/* adjust periodics after time jump */
		844	for (i = 0; i < periodiccnt; ++i)
325	{	845	{
326	ev_tstamp odiff = diff;	846	struct ev_periodic *w = periodics [i];
327		847
328	/* detecting time jumps is much more difficult */	848	if (w->interval)
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */
330	{	849	{
331	now = get_clock ();	850	ev_tstamp diff = ceil ((rt_now - w->at) / w->interval) * w->interval;
332	diff = ev_now - now;
333		851
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	852	if (fabs (diff) >= 1e-4)
335	return; /* all is well */	853	{
		854	ev_periodic_stop (EV_A_ w);
		855	ev_periodic_start (EV_A_ w);
336		856
337	ev_now = ev_time ();	857	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		858	}
338	}	859	}
		860	}
		861	}
339		862
340	/* time jump detected, reschedule atimers */	863	inline int
341	for (i = 0; i < atimercnt; ++i)	864	time_update_monotonic (EV_P)
		865	{
		866	mn_now = get_clock ();
		867
		868	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		869	{
		870	rt_now = rtmn_diff + mn_now;
		871	return 0;
		872	}
		873	else
		874	{
		875	now_floor = mn_now;
		876	rt_now = ev_time ();
		877	return 1;
		878	}
		879	}
		880
		881	static void
		882	time_update (EV_P)
		883	{
		884	int i;
		885
		886	#if EV_USE_MONOTONIC
		887	if (expect_true (have_monotonic))
		888	{
		889	if (time_update_monotonic (EV_A))
342	{	890	{
343	struct ev_timer *w = atimers [i];	891	ev_tstamp odiff = rtmn_diff;
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	892
		893	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		894	{
		895	rtmn_diff = rt_now - mn_now;
		896
		897	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		898	return; /* all is well */
		899
		900	rt_now = ev_time ();
		901	mn_now = get_clock ();
		902	now_floor = mn_now;
		903	}
		904
		905	periodics_reschedule (EV_A);
		906	/* no timer adjustment, as the monotonic clock doesn't jump */
		907	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
345	}	908	}
346	}	909	}
347	else	910	else
		911	#endif
348	{	912	{
349	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	913	rt_now = ev_time ();
350	/* time jump detected, adjust rtimers */	914
		915	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		916	{
		917	periodics_reschedule (EV_A);
		918
		919	/* adjust timers. this is easy, as the offset is the same for all */
351	for (i = 0; i < rtimercnt; ++i)	920	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	921	timers [i]->at += rt_now - mn_now;
		922	}
353		923
354	now = ev_now;	924	mn_now = rt_now;
355	}	925	}
356	}	926	}
357		927
358	int ev_loop_done;	928	void
		929	ev_ref (EV_P)
		930	{
		931	++activecnt;
		932	}
359		933
		934	void
		935	ev_unref (EV_P)
		936	{
		937	--activecnt;
		938	}
		939
		940	static int loop_done;
		941
		942	void
360	void ev_loop (int flags)	943	ev_loop (EV_P_ int flags)
361	{	944	{
362	double block;	945	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	946	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		947
365	do	948	do
366	{	949	{
		950	/* queue check watchers (and execute them) */
		951	if (expect_false (preparecnt))
		952	{
		953	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		954	call_pending (EV_A);
		955	}
		956
367	/* update fd-related kernel structures */	957	/* update fd-related kernel structures */
368	fd_reify ();	958	fd_reify (EV_A);
369		959
370	/* calculate blocking time */	960	/* calculate blocking time */
		961
		962	/* we only need this for !monotonic clockor timers, but as we basically
		963	always have timers, we just calculate it always */
		964	#if EV_USE_MONOTONIC
		965	if (expect_true (have_monotonic))
		966	time_update_monotonic (EV_A);
		967	else
		968	#endif
		969	{
		970	rt_now = ev_time ();
		971	mn_now = rt_now;
		972	}
		973
371	if (flags & EVLOOP_NONBLOCK)	974	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	975	block = 0.;
373	else	976	else
374	{	977	{
375	block = MAX_BLOCKTIME;	978	block = MAX_BLOCKTIME;
376		979
377	if (rtimercnt)	980	if (timercnt)
378	{	981	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	982	ev_tstamp to = timers [0]->at - mn_now + method_fudge;
380	if (block > to) block = to;	983	if (block > to) block = to;
381	}	984	}
382		985
383	if (atimercnt)	986	if (periodiccnt)
384	{	987	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	988	ev_tstamp to = periodics [0]->at - rt_now + method_fudge;
386	if (block > to) block = to;	989	if (block > to) block = to;
387	}	990	}
388		991
389	if (block < 0.) block = 0.;	992	if (block < 0.) block = 0.;
390	}	993	}
391		994
392	method_poll (block);	995	method_poll (EV_A_ block);
393		996
394	/* update ev_now, do magic */	997	/* update rt_now, do magic */
395	time_update ();	998	time_update (EV_A);
396		999
397	/* put pending timers into pendign queue and reschedule them */	1000	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1001	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1002	periodics_reify (EV_A); /* absolute timers called first */
400	/* relative timers second */
401	timers_reify (rtimers, rtimercnt, now);
402		1003
		1004	/* queue idle watchers unless io or timers are pending */
		1005	if (!pendingcnt)
		1006	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1007
		1008	/* queue check watchers, to be executed first */
		1009	if (checkcnt)
		1010	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1011
403	call_pending ();	1012	call_pending (EV_A);
404	}	1013	}
405	while (!ev_loop_done);	1014	while (activecnt && !loop_done);
406	}
407		1015
408	static void	1016	if (loop_done != 2)
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1017	loop_done = 0;
		1018	}
		1019
		1020	void
		1021	ev_unloop (EV_P_ int how)
		1022	{
		1023	loop_done = how;
		1024	}
		1025
		1026	/*****************************************************************************/
		1027
		1028	inline void
		1029	wlist_add (WL *head, WL elem)
410	{	1030	{
411	elem->next = *head;	1031	elem->next = *head;
412	*head = elem;	1032	*head = elem;
413	}	1033	}
414		1034
415	static void	1035	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1036	wlist_del (WL *head, WL elem)
417	{	1037	{
418	while (*head)	1038	while (*head)
419	{	1039	{
420	if (*head == elem)	1040	if (*head == elem)
421	{	1041	{
…		…
425		1045
426	head = &(*head)->next;	1046	head = &(*head)->next;
427	}	1047	}
428	}	1048	}
429		1049
430	static void	1050	inline void
431	ev_start (struct ev_watcher *w, int active)	1051	ev_clear_pending (EV_P_ W w)
432	{	1052	{
		1053	if (w->pending)
		1054	{
		1055	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1056	w->pending = 0;
		1057	}
		1058	}
		1059
		1060	inline void
		1061	ev_start (EV_P_ W w, int active)
		1062	{
		1063	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1064	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1065
434	w->active = active;	1066	w->active = active;
		1067	ev_ref (EV_A);
435	}	1068	}
436		1069
437	static void	1070	inline void
438	ev_stop (struct ev_watcher *w)	1071	ev_stop (EV_P_ W w)
439	{	1072	{
440	if (w->pending)	1073	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1074	w->active = 0;
444	/* nop */
445	}	1075	}
446		1076
		1077	/*****************************************************************************/
		1078
447	void	1079	void
448	evio_start (struct ev_io *w)	1080	ev_io_start (EV_P_ struct ev_io *w)
449	{	1081	{
		1082	int fd = w->fd;
		1083
450	if (ev_is_active (w))	1084	if (ev_is_active (w))
451	return;	1085	return;
452		1086
453	int fd = w->fd;	1087	assert (("ev_io_start called with negative fd", fd >= 0));
454		1088
455	ev_start ((struct ev_watcher *)w, 1);	1089	ev_start (EV_A_ (W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1090	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1091	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		1092
459	++fdchangecnt;	1093	fd_change (EV_A_ fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1094	}
463		1095
464	void	1096	void
465	evio_stop (struct ev_io *w)	1097	ev_io_stop (EV_P_ struct ev_io *w)
466	{	1098	{
		1099	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1100	if (!ev_is_active (w))
468	return;	1101	return;
469		1102
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1103	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	1104	ev_stop (EV_A_ (W)w);
472		1105
473	++fdchangecnt;	1106	fd_change (EV_A_ w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	1107	}
477		1108
478	void	1109	void
479	evtimer_start (struct ev_timer *w)	1110	ev_timer_start (EV_P_ struct ev_timer *w)
480	{	1111	{
481	if (ev_is_active (w))	1112	if (ev_is_active (w))
482	return;	1113	return;
483		1114
484	if (w->is_abs)	1115	w->at += mn_now;
		1116
		1117	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1118
		1119	ev_start (EV_A_ (W)w, ++timercnt);
		1120	array_needsize (timers, timermax, timercnt, );
		1121	timers [timercnt - 1] = w;
		1122	upheap ((WT *)timers, timercnt - 1);
		1123	}
		1124
		1125	void
		1126	ev_timer_stop (EV_P_ struct ev_timer *w)
		1127	{
		1128	ev_clear_pending (EV_A_ (W)w);
		1129	if (!ev_is_active (w))
		1130	return;
		1131
		1132	if (w->active < timercnt--)
		1133	{
		1134	timers [w->active - 1] = timers [timercnt];
		1135	downheap ((WT *)timers, timercnt, w->active - 1);
485	{	1136	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1137
		1138	w->at = w->repeat;
		1139
		1140	ev_stop (EV_A_ (W)w);
		1141	}
		1142
		1143	void
		1144	ev_timer_again (EV_P_ struct ev_timer *w)
		1145	{
		1146	if (ev_is_active (w))
		1147	{
487	if (w->repeat)	1148	if (w->repeat)
		1149	{
		1150	w->at = mn_now + w->repeat;
		1151	downheap ((WT *)timers, timercnt, w->active - 1);
		1152	}
		1153	else
		1154	ev_timer_stop (EV_A_ w);
		1155	}
		1156	else if (w->repeat)
		1157	ev_timer_start (EV_A_ w);
		1158	}
		1159
		1160	void
		1161	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1162	{
		1163	if (ev_is_active (w))
		1164	return;
		1165
		1166	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1167
		1168	/* this formula differs from the one in periodic_reify because we do not always round up */
		1169	if (w->interval)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1170	w->at += ceil ((rt_now - w->at) / w->interval) * w->interval;
489		1171
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	1172	ev_start (EV_A_ (W)w, ++periodiccnt);
491	array_needsize (atimers, atimermax, atimercnt, );	1173	array_needsize (periodics, periodicmax, periodiccnt, );
492	atimers [atimercnt - 1] = w;	1174	periodics [periodiccnt - 1] = w;
493	upheap (atimers, atimercnt - 1);	1175	upheap ((WT *)periodics, periodiccnt - 1);
		1176	}
		1177
		1178	void
		1179	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1180	{
		1181	ev_clear_pending (EV_A_ (W)w);
		1182	if (!ev_is_active (w))
		1183	return;
		1184
		1185	if (w->active < periodiccnt--)
494	}	1186	{
		1187	periodics [w->active - 1] = periodics [periodiccnt];
		1188	downheap ((WT *)periodics, periodiccnt, w->active - 1);
		1189	}
		1190
		1191	ev_stop (EV_A_ (W)w);
		1192	}
		1193
		1194	void
		1195	ev_idle_start (EV_P_ struct ev_idle *w)
		1196	{
		1197	if (ev_is_active (w))
		1198	return;
		1199
		1200	ev_start (EV_A_ (W)w, ++idlecnt);
		1201	array_needsize (idles, idlemax, idlecnt, );
		1202	idles [idlecnt - 1] = w;
		1203	}
		1204
		1205	void
		1206	ev_idle_stop (EV_P_ struct ev_idle *w)
		1207	{
		1208	ev_clear_pending (EV_A_ (W)w);
		1209	if (ev_is_active (w))
		1210	return;
		1211
		1212	idles [w->active - 1] = idles [--idlecnt];
		1213	ev_stop (EV_A_ (W)w);
		1214	}
		1215
		1216	void
		1217	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1218	{
		1219	if (ev_is_active (w))
		1220	return;
		1221
		1222	ev_start (EV_A_ (W)w, ++preparecnt);
		1223	array_needsize (prepares, preparemax, preparecnt, );
		1224	prepares [preparecnt - 1] = w;
		1225	}
		1226
		1227	void
		1228	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1229	{
		1230	ev_clear_pending (EV_A_ (W)w);
		1231	if (ev_is_active (w))
		1232	return;
		1233
		1234	prepares [w->active - 1] = prepares [--preparecnt];
		1235	ev_stop (EV_A_ (W)w);
		1236	}
		1237
		1238	void
		1239	ev_check_start (EV_P_ struct ev_check *w)
		1240	{
		1241	if (ev_is_active (w))
		1242	return;
		1243
		1244	ev_start (EV_A_ (W)w, ++checkcnt);
		1245	array_needsize (checks, checkmax, checkcnt, );
		1246	checks [checkcnt - 1] = w;
		1247	}
		1248
		1249	void
		1250	ev_check_stop (EV_P_ struct ev_check *w)
		1251	{
		1252	ev_clear_pending (EV_A_ (W)w);
		1253	if (ev_is_active (w))
		1254	return;
		1255
		1256	checks [w->active - 1] = checks [--checkcnt];
		1257	ev_stop (EV_A_ (W)w);
		1258	}
		1259
		1260	#ifndef SA_RESTART
		1261	# define SA_RESTART 0
		1262	#endif
		1263
		1264	void
		1265	ev_signal_start (EV_P_ struct ev_signal *w)
		1266	{
		1267	#if EV_MULTIPLICITY
		1268	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1269	#endif
		1270	if (ev_is_active (w))
		1271	return;
		1272
		1273	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1274
		1275	ev_start (EV_A_ (W)w, 1);
		1276	array_needsize (signals, signalmax, w->signum, signals_init);
		1277	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1278
		1279	if (!w->next)
		1280	{
		1281	struct sigaction sa;
		1282	sa.sa_handler = sighandler;
		1283	sigfillset (&sa.sa_mask);
		1284	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1285	sigaction (w->signum, &sa, 0);
		1286	}
		1287	}
		1288
		1289	void
		1290	ev_signal_stop (EV_P_ struct ev_signal *w)
		1291	{
		1292	ev_clear_pending (EV_A_ (W)w);
		1293	if (!ev_is_active (w))
		1294	return;
		1295
		1296	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1297	ev_stop (EV_A_ (W)w);
		1298
		1299	if (!signals [w->signum - 1].head)
		1300	signal (w->signum, SIG_DFL);
		1301	}
		1302
		1303	void
		1304	ev_child_start (EV_P_ struct ev_child *w)
		1305	{
		1306	#if EV_MULTIPLICITY
		1307	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1308	#endif
		1309	if (ev_is_active (w))
		1310	return;
		1311
		1312	ev_start (EV_A_ (W)w, 1);
		1313	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1314	}
		1315
		1316	void
		1317	ev_child_stop (EV_P_ struct ev_child *w)
		1318	{
		1319	ev_clear_pending (EV_A_ (W)w);
		1320	if (ev_is_active (w))
		1321	return;
		1322
		1323	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1324	ev_stop (EV_A_ (W)w);
		1325	}
		1326
		1327	/*****************************************************************************/
		1328
		1329	struct ev_once
		1330	{
		1331	struct ev_io io;
		1332	struct ev_timer to;
		1333	void (*cb)(int revents, void *arg);
		1334	void *arg;
		1335	};
		1336
		1337	static void
		1338	once_cb (EV_P_ struct ev_once *once, int revents)
		1339	{
		1340	void (*cb)(int revents, void *arg) = once->cb;
		1341	void *arg = once->arg;
		1342
		1343	ev_io_stop (EV_A_ &once->io);
		1344	ev_timer_stop (EV_A_ &once->to);
		1345	free (once);
		1346
		1347	cb (revents, arg);
		1348	}
		1349
		1350	static void
		1351	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1352	{
		1353	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1354	}
		1355
		1356	static void
		1357	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1358	{
		1359	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1360	}
		1361
		1362	void
		1363	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1364	{
		1365	struct ev_once *once = malloc (sizeof (struct ev_once));
		1366
		1367	if (!once)
		1368	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
495	else	1369	else
496	{	1370	{
497	w->at += now;	1371	once->cb = cb;
		1372	once->arg = arg;
498		1373
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1374	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1375	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	{	1376	{
517	atimers [w->active - 1] = atimers [atimercnt];	1377	ev_io_set (&once->io, fd, events);
518	downheap (atimers, atimercnt, w->active - 1);	1378	ev_io_start (EV_A_ &once->io);
519	}	1379	}
520	}	1380
521	else	1381	ev_watcher_init (&once->to, once_cb_to);
522	{	1382	if (timeout >= 0.)
523	if (w->active < rtimercnt--)
524	{	1383	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1384	ev_timer_set (&once->to, timeout, 0.);
526	downheap (rtimers, rtimercnt, w->active - 1);	1385	ev_timer_start (EV_A_ &once->to);
527	}	1386	}
528	}	1387	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1388	}
532		1389
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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