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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 1.64 by root, Sun Nov 4 23:14:11 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
260	if (anfd->wev != wev)	309	anfd->reify = 0;
		310
		311	method_modify (EV_A_ fd, anfd->events, events);
		312	anfd->events = events;
		313	}
		314
		315	fdchangecnt = 0;
		316	}
		317
		318	static void
		319	fd_change (EV_P_ int fd)
		320	{
		321	if (anfds [fd].reify || fdchangecnt < 0)
		322	return;
		323
		324	anfds [fd].reify = 1;
		325
		326	++fdchangecnt;
		327	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		328	fdchanges [fdchangecnt - 1] = fd;
		329	}
		330
		331	static void
		332	fd_kill (EV_P_ int fd)
		333	{
		334	struct ev_io *w;
		335
		336	while ((w = (struct ev_io *)anfds [fd].head))
		337	{
		338	ev_io_stop (EV_A_ w);
		339	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		340	}
		341	}
		342
		343	/* called on EBADF to verify fds */
		344	static void
		345	fd_ebadf (EV_P)
		346	{
		347	int fd;
		348
		349	for (fd = 0; fd < anfdmax; ++fd)
		350	if (anfds [fd].events)
		351	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		352	fd_kill (EV_A_ fd);
		353	}
		354
		355	/* called on ENOMEM in select/poll to kill some fds and retry */
		356	static void
		357	fd_enomem (EV_P)
		358	{
		359	int fd;
		360
		361	for (fd = anfdmax; fd--; )
		362	if (anfds [fd].events)
		363	{
		364	close (fd);
		365	fd_kill (EV_A_ fd);
		366	return;
		367	}
		368	}
		369
		370	/* susually called after fork if method needs to re-arm all fds from scratch */
		371	static void
		372	fd_rearm_all (EV_P)
		373	{
		374	int fd;
		375
		376	/* this should be highly optimised to not do anything but set a flag */
		377	for (fd = 0; fd < anfdmax; ++fd)
		378	if (anfds [fd].events)
		379	{
		380	anfds [fd].events = 0;
		381	fd_change (EV_A_ fd);
		382	}
		383	}
		384
		385	/*****************************************************************************/
		386
		387	static void
		388	upheap (WT *heap, int k)
		389	{
		390	WT w = heap [k];
		391
		392	while (k && heap [k >> 1]->at > w->at)
		393	{
		394	heap [k] = heap [k >> 1];
		395	((W)heap [k])->active = k + 1;
		396	k >>= 1;
		397	}
		398
		399	heap [k] = w;
		400	((W)heap [k])->active = k + 1;
		401
		402	}
		403
		404	static void
		405	downheap (WT *heap, int N, int k)
		406	{
		407	WT w = heap [k];
		408
		409	while (k < (N >> 1))
		410	{
		411	int j = k << 1;
		412
		413	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		414	++j;
		415
		416	if (w->at <= heap [j]->at)
		417	break;
		418
		419	heap [k] = heap [j];
		420	((W)heap [k])->active = k + 1;
		421	k = j;
		422	}
		423
		424	heap [k] = w;
		425	((W)heap [k])->active = k + 1;
		426	}
		427
		428	/*****************************************************************************/
		429
		430	typedef struct
		431	{
		432	struct ev_watcher_list *head;
		433	sig_atomic_t volatile gotsig;
		434	} ANSIG;
		435
		436	static ANSIG *signals;
		437	static int signalmax;
		438
		439	static int sigpipe [2];
		440	static sig_atomic_t volatile gotsig;
		441	static struct ev_io sigev;
		442
		443	static void
		444	signals_init (ANSIG *base, int count)
		445	{
		446	while (count--)
		447	{
		448	base->head = 0;
		449	base->gotsig = 0;
		450
		451	++base;
		452	}
		453	}
		454
		455	static void
		456	sighandler (int signum)
		457	{
		458	signals [signum - 1].gotsig = 1;
		459
		460	if (!gotsig)
		461	{
		462	int old_errno = errno;
		463	gotsig = 1;
		464	write (sigpipe [1], &signum, 1);
		465	errno = old_errno;
		466	}
		467	}
		468
		469	static void
		470	sigcb (EV_P_ struct ev_io *iow, int revents)
		471	{
		472	struct ev_watcher_list *w;
		473	int signum;
		474
		475	read (sigpipe [0], &revents, 1);
		476	gotsig = 0;
		477
		478	for (signum = signalmax; signum--; )
		479	if (signals [signum].gotsig)
		480	{
		481	signals [signum].gotsig = 0;
		482
		483	for (w = signals [signum].head; w; w = w->next)
		484	event (EV_A_ (W)w, EV_SIGNAL);
		485	}
		486	}
		487
		488	static void
		489	siginit (EV_P)
		490	{
		491	#ifndef WIN32
		492	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		493	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		494
		495	/* rather than sort out wether we really need nb, set it */
		496	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		497	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		498	#endif
		499
		500	ev_io_set (&sigev, sigpipe [0], EV_READ);
		501	ev_io_start (EV_A_ &sigev);
		502	ev_unref (EV_A); /* child watcher should not keep loop alive */
		503	}
		504
		505	/*****************************************************************************/
		506
		507	#ifndef WIN32
		508
		509	static struct ev_child *childs [PID_HASHSIZE];
		510	static struct ev_signal childev;
		511
		512	#ifndef WCONTINUED
		513	# define WCONTINUED 0
		514	#endif
		515
		516	static void
		517	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		518	{
		519	struct ev_child *w;
		520
		521	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		522	if (w->pid == pid || !w->pid)
		523	{
		524	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		525	w->rpid = pid;
		526	w->rstatus = status;
		527	event (EV_A_ (W)w, EV_CHILD);
		528	}
		529	}
		530
		531	static void
		532	childcb (EV_P_ struct ev_signal *sw, int revents)
		533	{
		534	int pid, status;
		535
		536	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		537	{
		538	/* make sure we are called again until all childs have been reaped */
		539	event (EV_A_ (W)sw, EV_SIGNAL);
		540
		541	child_reap (EV_A_ sw, pid, pid, status);
		542	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		543	}
		544	}
		545
		546	#endif
		547
		548	/*****************************************************************************/
		549
		550	#if EV_USE_KQUEUE
		551	# include "ev_kqueue.c"
		552	#endif
		553	#if EV_USE_EPOLL
		554	# include "ev_epoll.c"
		555	#endif
		556	#if EV_USE_POLL
		557	# include "ev_poll.c"
		558	#endif
		559	#if EV_USE_SELECT
		560	# include "ev_select.c"
		561	#endif
		562
		563	int
		564	ev_version_major (void)
		565	{
		566	return EV_VERSION_MAJOR;
		567	}
		568
		569	int
		570	ev_version_minor (void)
		571	{
		572	return EV_VERSION_MINOR;
		573	}
		574
		575	/* return true if we are running with elevated privileges and should ignore env variables */
		576	static int
		577	enable_secure (void)
		578	{
		579	#ifdef WIN32
		580	return 0;
		581	#else
		582	return getuid () != geteuid ()
		583	|| getgid () != getegid ();
		584	#endif
		585	}
		586
		587	int
		588	ev_method (EV_P)
		589	{
		590	return method;
		591	}
		592
		593	static void
		594	loop_init (EV_P_ int methods)
		595	{
		596	if (!method)
		597	{
		598	#if EV_USE_MONOTONIC
		599	{
		600	struct timespec ts;
		601	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		602	have_monotonic = 1;
		603	}
		604	#endif
		605
		606	rt_now = ev_time ();
		607	mn_now = get_clock ();
		608	now_floor = mn_now;
		609	rtmn_diff = rt_now - mn_now;
		610
		611	if (methods == EVMETHOD_AUTO)
		612	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		613	methods = atoi (getenv ("LIBEV_METHODS"));
		614	else
		615	methods = EVMETHOD_ANY;
		616
		617	method = 0;
		618	#if EV_USE_WIN32
		619	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		620	#endif
		621	#if EV_USE_KQUEUE
		622	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		623	#endif
		624	#if EV_USE_EPOLL
		625	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		626	#endif
		627	#if EV_USE_POLL
		628	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		629	#endif
		630	#if EV_USE_SELECT
		631	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		632	#endif
		633	}
		634	}
		635
		636	void
		637	loop_destroy (EV_P)
		638	{
		639	#if EV_USE_WIN32
		640	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		641	#endif
		642	#if EV_USE_KQUEUE
		643	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		644	#endif
		645	#if EV_USE_EPOLL
		646	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		647	#endif
		648	#if EV_USE_POLL
		649	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		650	#endif
		651	#if EV_USE_SELECT
		652	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		653	#endif
		654
		655	method = 0;
		656	/*TODO*/
		657	}
		658
		659	void
		660	loop_fork (EV_P)
		661	{
		662	/*TODO*/
		663	#if EV_USE_EPOLL
		664	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		665	#endif
		666	#if EV_USE_KQUEUE
		667	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		668	#endif
		669	}
		670
		671	#if EV_MULTIPLICITY
		672	struct ev_loop *
		673	ev_loop_new (int methods)
		674	{
		675	struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop));
		676
		677	loop_init (EV_A_ methods);
		678
		679	if (ev_method (EV_A))
		680	return loop;
		681
		682	return 0;
		683	}
		684
		685	void
		686	ev_loop_destroy (EV_P)
		687	{
		688	loop_destroy (EV_A);
		689	free (loop);
		690	}
		691
		692	void
		693	ev_loop_fork (EV_P)
		694	{
		695	loop_fork (EV_A);
		696	}
		697
		698	#endif
		699
		700	#if EV_MULTIPLICITY
		701	struct ev_loop default_loop_struct;
		702	static struct ev_loop *default_loop;
		703
		704	struct ev_loop *
		705	#else
		706	static int default_loop;
		707
		708	int
		709	#endif
		710	ev_default_loop (int methods)
		711	{
		712	if (sigpipe [0] == sigpipe [1])
		713	if (pipe (sigpipe))
		714	return 0;
		715
		716	if (!default_loop)
		717	{
		718	#if EV_MULTIPLICITY
		719	struct ev_loop *loop = default_loop = &default_loop_struct;
		720	#else
		721	default_loop = 1;
		722	#endif
		723
		724	loop_init (EV_A_ methods);
		725
		726	if (ev_method (EV_A))
261	{	727	{
262	method_modify (fd, anfd->wev, wev);	728	ev_watcher_init (&sigev, sigcb);
263	anfd->wev = wev;	729	ev_set_priority (&sigev, EV_MAXPRI);
		730	siginit (EV_A);
		731
		732	#ifndef WIN32
		733	ev_signal_init (&childev, childcb, SIGCHLD);
		734	ev_set_priority (&childev, EV_MAXPRI);
		735	ev_signal_start (EV_A_ &childev);
		736	ev_unref (EV_A); /* child watcher should not keep loop alive */
		737	#endif
264	}	738	}
		739	else
		740	default_loop = 0;
265	}	741	}
266		742
267	fdchangecnt = 0;	743	return default_loop;
268	}	744	}
269		745
		746	void
		747	ev_default_destroy (void)
		748	{
		749	#if EV_MULTIPLICITY
		750	struct ev_loop *loop = default_loop;
		751	#endif
		752
		753	ev_ref (EV_A); /* child watcher */
		754	ev_signal_stop (EV_A_ &childev);
		755
		756	ev_ref (EV_A); /* signal watcher */
		757	ev_io_stop (EV_A_ &sigev);
		758
		759	close (sigpipe [0]); sigpipe [0] = 0;
		760	close (sigpipe [1]); sigpipe [1] = 0;
		761
		762	loop_destroy (EV_A);
		763	}
		764
		765	void
		766	ev_default_fork (void)
		767	{
		768	#if EV_MULTIPLICITY
		769	struct ev_loop *loop = default_loop;
		770	#endif
		771
		772	loop_fork (EV_A);
		773
		774	ev_io_stop (EV_A_ &sigev);
		775	close (sigpipe [0]);
		776	close (sigpipe [1]);
		777	pipe (sigpipe);
		778
		779	ev_ref (EV_A); /* signal watcher */
		780	siginit (EV_A);
		781	}
		782
		783	/*****************************************************************************/
		784
270	static void	785	static void
271	call_pending ()	786	call_pending (EV_P)
272	{	787	{
273	int i;	788	int pri;
274		789
275	for (i = 0; i < pendingcnt; ++i)	790	for (pri = NUMPRI; pri--; )
		791	while (pendingcnt [pri])
276	{	792	{
277	ANPENDING *p = pendings + i;	793	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
278		794
279	if (p->w)	795	if (p->w)
280	{	796	{
281	p->w->pending = 0;	797	p->w->pending = 0;
282	p->w->cb (p->w, p->events);	798
		799	(*(void (**)(EV_P_ W, int))&p->w->cb) (EV_A_ p->w, p->events);
283	}	800	}
284	}	801	}
285
286	pendingcnt = 0;
287	}	802	}
288		803
289	static void	804	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	805	timers_reify (EV_P)
291	{	806	{
292	while (timercnt && timers [0]->at <= now)	807	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	808	{
294	struct ev_timer *w = timers [0];	809	struct ev_timer *w = timers [0];
		810
		811	assert (("inactive timer on timer heap detected", ev_is_active (w)));
295		812
296	/* first reschedule or stop timer */	813	/* first reschedule or stop timer */
297	if (w->repeat)	814	if (w->repeat)
298	{	815	{
299	if (w->is_abs)	816	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;	817	((WT)w)->at = mn_now + w->repeat;
303
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	818	downheap ((WT *)timers, timercnt, 0);
307	}	819	}
308	else	820	else
		821	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		822
		823	event (EV_A_ (W)w, EV_TIMEOUT);
		824	}
		825	}
		826
		827	static void
		828	periodics_reify (EV_P)
		829	{
		830	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		831	{
		832	struct ev_periodic *w = periodics [0];
		833
		834	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		835
		836	/* first reschedule or stop timer */
		837	if (w->interval)
309	{	838	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	839	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
311	--timercnt; /* maybe pass by reference instead? */	840	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		841	downheap ((WT *)periodics, periodiccnt, 0);
312	}	842	}
		843	else
		844	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		845
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	846	event (EV_A_ (W)w, EV_PERIODIC);
315	}	847	}
316	}	848	}
317		849
318	static void	850	static void
319	time_update ()	851	periodics_reschedule (EV_P)
320	{	852	{
321	int i;	853	int i;
322	ev_now = ev_time ();
323		854
324	if (have_monotonic)	855	/* adjust periodics after time jump */
		856	for (i = 0; i < periodiccnt; ++i)
325	{	857	{
326	ev_tstamp odiff = diff;	858	struct ev_periodic *w = periodics [i];
327		859
328	/* detecting time jumps is much more difficult */	860	if (w->interval)
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */
330	{	861	{
331	now = get_clock ();	862	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
332	diff = ev_now - now;
333		863
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	864	if (fabs (diff) >= 1e-4)
335	return; /* all is well */	865	{
		866	ev_periodic_stop (EV_A_ w);
		867	ev_periodic_start (EV_A_ w);
336		868
337	ev_now = ev_time ();	869	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		870	}
338	}	871	}
		872	}
		873	}
339		874
340	/* time jump detected, reschedule atimers */	875	inline int
341	for (i = 0; i < atimercnt; ++i)	876	time_update_monotonic (EV_P)
		877	{
		878	mn_now = get_clock ();
		879
		880	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		881	{
		882	rt_now = rtmn_diff + mn_now;
		883	return 0;
		884	}
		885	else
		886	{
		887	now_floor = mn_now;
		888	rt_now = ev_time ();
		889	return 1;
		890	}
		891	}
		892
		893	static void
		894	time_update (EV_P)
		895	{
		896	int i;
		897
		898	#if EV_USE_MONOTONIC
		899	if (expect_true (have_monotonic))
		900	{
		901	if (time_update_monotonic (EV_A))
342	{	902	{
343	struct ev_timer *w = atimers [i];	903	ev_tstamp odiff = rtmn_diff;
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	904
		905	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		906	{
		907	rtmn_diff = rt_now - mn_now;
		908
		909	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		910	return; /* all is well */
		911
		912	rt_now = ev_time ();
		913	mn_now = get_clock ();
		914	now_floor = mn_now;
		915	}
		916
		917	periodics_reschedule (EV_A);
		918	/* no timer adjustment, as the monotonic clock doesn't jump */
		919	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
345	}	920	}
346	}	921	}
347	else	922	else
		923	#endif
348	{	924	{
349	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	925	rt_now = ev_time ();
350	/* time jump detected, adjust rtimers */	926
		927	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		928	{
		929	periodics_reschedule (EV_A);
		930
		931	/* adjust timers. this is easy, as the offset is the same for all */
351	for (i = 0; i < rtimercnt; ++i)	932	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	933	((WT)timers [i])->at += rt_now - mn_now;
		934	}
353		935
354	now = ev_now;	936	mn_now = rt_now;
355	}	937	}
356	}	938	}
357		939
358	int ev_loop_done;	940	void
		941	ev_ref (EV_P)
		942	{
		943	++activecnt;
		944	}
359		945
		946	void
		947	ev_unref (EV_P)
		948	{
		949	--activecnt;
		950	}
		951
		952	static int loop_done;
		953
		954	void
360	void ev_loop (int flags)	955	ev_loop (EV_P_ int flags)
361	{	956	{
362	double block;	957	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	958	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		959
365	do	960	do
366	{	961	{
		962	/* queue check watchers (and execute them) */
		963	if (expect_false (preparecnt))
		964	{
		965	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		966	call_pending (EV_A);
		967	}
		968
367	/* update fd-related kernel structures */	969	/* update fd-related kernel structures */
368	fd_reify ();	970	fd_reify (EV_A);
369		971
370	/* calculate blocking time */	972	/* calculate blocking time */
		973
		974	/* we only need this for !monotonic clockor timers, but as we basically
		975	always have timers, we just calculate it always */
		976	#if EV_USE_MONOTONIC
		977	if (expect_true (have_monotonic))
		978	time_update_monotonic (EV_A);
		979	else
		980	#endif
		981	{
		982	rt_now = ev_time ();
		983	mn_now = rt_now;
		984	}
		985
371	if (flags & EVLOOP_NONBLOCK)	986	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	987	block = 0.;
373	else	988	else
374	{	989	{
375	block = MAX_BLOCKTIME;	990	block = MAX_BLOCKTIME;
376		991
377	if (rtimercnt)	992	if (timercnt)
378	{	993	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	994	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
380	if (block > to) block = to;	995	if (block > to) block = to;
381	}	996	}
382		997
383	if (atimercnt)	998	if (periodiccnt)
384	{	999	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1000	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
386	if (block > to) block = to;	1001	if (block > to) block = to;
387	}	1002	}
388		1003
389	if (block < 0.) block = 0.;	1004	if (block < 0.) block = 0.;
390	}	1005	}
391		1006
392	method_poll (block);	1007	method_poll (EV_A_ block);
393		1008
394	/* update ev_now, do magic */	1009	/* update rt_now, do magic */
395	time_update ();	1010	time_update (EV_A);
396		1011
397	/* put pending timers into pendign queue and reschedule them */	1012	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1013	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1014	periodics_reify (EV_A); /* absolute timers called first */
400	/* relative timers second */
401	timers_reify (rtimers, rtimercnt, now);
402		1015
		1016	/* queue idle watchers unless io or timers are pending */
		1017	if (!pendingcnt)
		1018	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1019
		1020	/* queue check watchers, to be executed first */
		1021	if (checkcnt)
		1022	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1023
403	call_pending ();	1024	call_pending (EV_A);
404	}	1025	}
405	while (!ev_loop_done);	1026	while (activecnt && !loop_done);
406	}
407		1027
408	static void	1028	if (loop_done != 2)
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1029	loop_done = 0;
		1030	}
		1031
		1032	void
		1033	ev_unloop (EV_P_ int how)
		1034	{
		1035	loop_done = how;
		1036	}
		1037
		1038	/*****************************************************************************/
		1039
		1040	inline void
		1041	wlist_add (WL *head, WL elem)
410	{	1042	{
411	elem->next = *head;	1043	elem->next = *head;
412	*head = elem;	1044	*head = elem;
413	}	1045	}
414		1046
415	static void	1047	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1048	wlist_del (WL *head, WL elem)
417	{	1049	{
418	while (*head)	1050	while (*head)
419	{	1051	{
420	if (*head == elem)	1052	if (*head == elem)
421	{	1053	{
…		…
425		1057
426	head = &(*head)->next;	1058	head = &(*head)->next;
427	}	1059	}
428	}	1060	}
429		1061
430	static void	1062	inline void
431	ev_start (struct ev_watcher *w, int active)	1063	ev_clear_pending (EV_P_ W w)
432	{	1064	{
		1065	if (w->pending)
		1066	{
		1067	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1068	w->pending = 0;
		1069	}
		1070	}
		1071
		1072	inline void
		1073	ev_start (EV_P_ W w, int active)
		1074	{
		1075	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1076	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1077
434	w->active = active;	1078	w->active = active;
		1079	ev_ref (EV_A);
435	}	1080	}
436		1081
437	static void	1082	inline void
438	ev_stop (struct ev_watcher *w)	1083	ev_stop (EV_P_ W w)
439	{	1084	{
440	if (w->pending)	1085	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1086	w->active = 0;
444	/* nop */
445	}	1087	}
446		1088
		1089	/*****************************************************************************/
		1090
447	void	1091	void
448	evio_start (struct ev_io *w)	1092	ev_io_start (EV_P_ struct ev_io *w)
449	{	1093	{
		1094	int fd = w->fd;
		1095
450	if (ev_is_active (w))	1096	if (ev_is_active (w))
451	return;	1097	return;
452		1098
453	int fd = w->fd;	1099	assert (("ev_io_start called with negative fd", fd >= 0));
454		1100
455	ev_start ((struct ev_watcher *)w, 1);	1101	ev_start (EV_A_ (W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1102	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1103	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		1104
459	++fdchangecnt;	1105	fd_change (EV_A_ fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1106	}
463		1107
464	void	1108	void
465	evio_stop (struct ev_io *w)	1109	ev_io_stop (EV_P_ struct ev_io *w)
466	{	1110	{
		1111	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1112	if (!ev_is_active (w))
468	return;	1113	return;
469		1114
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1115	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	1116	ev_stop (EV_A_ (W)w);
472		1117
473	++fdchangecnt;	1118	fd_change (EV_A_ w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	1119	}
477		1120
478	void	1121	void
479	evtimer_start (struct ev_timer *w)	1122	ev_timer_start (EV_P_ struct ev_timer *w)
480	{	1123	{
481	if (ev_is_active (w))	1124	if (ev_is_active (w))
482	return;	1125	return;
483		1126
484	if (w->is_abs)	1127	((WT)w)->at += mn_now;
		1128
		1129	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1130
		1131	ev_start (EV_A_ (W)w, ++timercnt);
		1132	array_needsize (timers, timermax, timercnt, );
		1133	timers [timercnt - 1] = w;
		1134	upheap ((WT *)timers, timercnt - 1);
		1135
		1136	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1137	}
		1138
		1139	void
		1140	ev_timer_stop (EV_P_ struct ev_timer *w)
		1141	{
		1142	ev_clear_pending (EV_A_ (W)w);
		1143	if (!ev_is_active (w))
		1144	return;
		1145
		1146	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1147
		1148	if (((W)w)->active < timercnt--)
		1149	{
		1150	timers [((W)w)->active - 1] = timers [timercnt];
		1151	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
485	{	1152	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1153
		1154	((WT)w)->at = w->repeat;
		1155
		1156	ev_stop (EV_A_ (W)w);
		1157	}
		1158
		1159	void
		1160	ev_timer_again (EV_P_ struct ev_timer *w)
		1161	{
		1162	if (ev_is_active (w))
		1163	{
487	if (w->repeat)	1164	if (w->repeat)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1165	{
		1166	((WT)w)->at = mn_now + w->repeat;
		1167	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1168	}
		1169	else
		1170	ev_timer_stop (EV_A_ w);
		1171	}
		1172	else if (w->repeat)
		1173	ev_timer_start (EV_A_ w);
		1174	}
489		1175
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	1176	void
491	array_needsize (atimers, atimermax, atimercnt, );	1177	ev_periodic_start (EV_P_ struct ev_periodic *w)
492	atimers [atimercnt - 1] = w;	1178	{
493	upheap (atimers, atimercnt - 1);	1179	if (ev_is_active (w))
		1180	return;
		1181
		1182	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1183
		1184	/* this formula differs from the one in periodic_reify because we do not always round up */
		1185	if (w->interval)
		1186	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1187
		1188	ev_start (EV_A_ (W)w, ++periodiccnt);
		1189	array_needsize (periodics, periodicmax, periodiccnt, );
		1190	periodics [periodiccnt - 1] = w;
		1191	upheap ((WT *)periodics, periodiccnt - 1);
		1192
		1193	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1194	}
		1195
		1196	void
		1197	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1198	{
		1199	ev_clear_pending (EV_A_ (W)w);
		1200	if (!ev_is_active (w))
		1201	return;
		1202
		1203	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1204
		1205	if (((W)w)->active < periodiccnt--)
494	}	1206	{
		1207	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1208	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1209	}
		1210
		1211	ev_stop (EV_A_ (W)w);
		1212	}
		1213
		1214	void
		1215	ev_idle_start (EV_P_ struct ev_idle *w)
		1216	{
		1217	if (ev_is_active (w))
		1218	return;
		1219
		1220	ev_start (EV_A_ (W)w, ++idlecnt);
		1221	array_needsize (idles, idlemax, idlecnt, );
		1222	idles [idlecnt - 1] = w;
		1223	}
		1224
		1225	void
		1226	ev_idle_stop (EV_P_ struct ev_idle *w)
		1227	{
		1228	ev_clear_pending (EV_A_ (W)w);
		1229	if (ev_is_active (w))
		1230	return;
		1231
		1232	idles [((W)w)->active - 1] = idles [--idlecnt];
		1233	ev_stop (EV_A_ (W)w);
		1234	}
		1235
		1236	void
		1237	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1238	{
		1239	if (ev_is_active (w))
		1240	return;
		1241
		1242	ev_start (EV_A_ (W)w, ++preparecnt);
		1243	array_needsize (prepares, preparemax, preparecnt, );
		1244	prepares [preparecnt - 1] = w;
		1245	}
		1246
		1247	void
		1248	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1249	{
		1250	ev_clear_pending (EV_A_ (W)w);
		1251	if (ev_is_active (w))
		1252	return;
		1253
		1254	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1255	ev_stop (EV_A_ (W)w);
		1256	}
		1257
		1258	void
		1259	ev_check_start (EV_P_ struct ev_check *w)
		1260	{
		1261	if (ev_is_active (w))
		1262	return;
		1263
		1264	ev_start (EV_A_ (W)w, ++checkcnt);
		1265	array_needsize (checks, checkmax, checkcnt, );
		1266	checks [checkcnt - 1] = w;
		1267	}
		1268
		1269	void
		1270	ev_check_stop (EV_P_ struct ev_check *w)
		1271	{
		1272	ev_clear_pending (EV_A_ (W)w);
		1273	if (ev_is_active (w))
		1274	return;
		1275
		1276	checks [((W)w)->active - 1] = checks [--checkcnt];
		1277	ev_stop (EV_A_ (W)w);
		1278	}
		1279
		1280	#ifndef SA_RESTART
		1281	# define SA_RESTART 0
		1282	#endif
		1283
		1284	void
		1285	ev_signal_start (EV_P_ struct ev_signal *w)
		1286	{
		1287	#if EV_MULTIPLICITY
		1288	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1289	#endif
		1290	if (ev_is_active (w))
		1291	return;
		1292
		1293	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1294
		1295	ev_start (EV_A_ (W)w, 1);
		1296	array_needsize (signals, signalmax, w->signum, signals_init);
		1297	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1298
		1299	if (!((WL)w)->next)
		1300	{
		1301	struct sigaction sa;
		1302	sa.sa_handler = sighandler;
		1303	sigfillset (&sa.sa_mask);
		1304	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1305	sigaction (w->signum, &sa, 0);
		1306	}
		1307	}
		1308
		1309	void
		1310	ev_signal_stop (EV_P_ struct ev_signal *w)
		1311	{
		1312	ev_clear_pending (EV_A_ (W)w);
		1313	if (!ev_is_active (w))
		1314	return;
		1315
		1316	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1317	ev_stop (EV_A_ (W)w);
		1318
		1319	if (!signals [w->signum - 1].head)
		1320	signal (w->signum, SIG_DFL);
		1321	}
		1322
		1323	void
		1324	ev_child_start (EV_P_ struct ev_child *w)
		1325	{
		1326	#if EV_MULTIPLICITY
		1327	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1328	#endif
		1329	if (ev_is_active (w))
		1330	return;
		1331
		1332	ev_start (EV_A_ (W)w, 1);
		1333	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1334	}
		1335
		1336	void
		1337	ev_child_stop (EV_P_ struct ev_child *w)
		1338	{
		1339	ev_clear_pending (EV_A_ (W)w);
		1340	if (ev_is_active (w))
		1341	return;
		1342
		1343	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1344	ev_stop (EV_A_ (W)w);
		1345	}
		1346
		1347	/*****************************************************************************/
		1348
		1349	struct ev_once
		1350	{
		1351	struct ev_io io;
		1352	struct ev_timer to;
		1353	void (*cb)(int revents, void *arg);
		1354	void *arg;
		1355	};
		1356
		1357	static void
		1358	once_cb (EV_P_ struct ev_once *once, int revents)
		1359	{
		1360	void (*cb)(int revents, void *arg) = once->cb;
		1361	void *arg = once->arg;
		1362
		1363	ev_io_stop (EV_A_ &once->io);
		1364	ev_timer_stop (EV_A_ &once->to);
		1365	free (once);
		1366
		1367	cb (revents, arg);
		1368	}
		1369
		1370	static void
		1371	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1372	{
		1373	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1374	}
		1375
		1376	static void
		1377	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1378	{
		1379	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1380	}
		1381
		1382	void
		1383	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1384	{
		1385	struct ev_once *once = malloc (sizeof (struct ev_once));
		1386
		1387	if (!once)
		1388	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
495	else	1389	else
496	{	1390	{
497	w->at += now;	1391	once->cb = cb;
		1392	once->arg = arg;
498		1393
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1394	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1395	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	{	1396	{
517	atimers [w->active - 1] = atimers [atimercnt];	1397	ev_io_set (&once->io, fd, events);
518	downheap (atimers, atimercnt, w->active - 1);	1398	ev_io_start (EV_A_ &once->io);
519	}	1399	}
520	}	1400
521	else	1401	ev_watcher_init (&once->to, once_cb_to);
522	{	1402	if (timeout >= 0.)
523	if (w->active < rtimercnt--)
524	{	1403	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1404	ev_timer_set (&once->to, timeout, 0.);
526	downheap (rtimers, rtimercnt, w->active - 1);	1405	ev_timer_start (EV_A_ &once->to);
527	}	1406	}
528	}	1407	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1408	}
532		1409
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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