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Comparing libev/ev.c (file contents):
Revision 1.10 by root, Wed Oct 31 07:36:03 2007 UTC vs.
Revision 1.52 by root, Sat Nov 3 22:10:39 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	#endif
		34
1	#include <math.h>	35	#include <math.h>
2	#include <stdlib.h>	36	#include <stdlib.h>
3	#include <unistd.h>	37	#include <unistd.h>
4	#include <fcntl.h>	38	#include <fcntl.h>
5	#include <signal.h>	39	#include <signal.h>
		40	#include <stddef.h>
6		41
7	#include <stdio.h>	42	#include <stdio.h>
8		43
9	#include <assert.h>	44	#include <assert.h>
10	#include <errno.h>	45	#include <errno.h>
		46	#include <sys/types.h>
		47	#ifndef WIN32
		48	# include <sys/wait.h>
		49	#endif
11	#include <sys/time.h>	50	#include <sys/time.h>
12	#include <time.h>	51	#include <time.h>
13		52
		53	/**/
		54
14	#ifndef HAVE_MONOTONIC	55	#ifndef EV_USE_MONOTONIC
		56	# define EV_USE_MONOTONIC 1
		57	#endif
		58
		59	#ifndef EV_USE_SELECT
		60	# define EV_USE_SELECT 1
		61	#endif
		62
		63	#ifndef EV_USEV_POLL
		64	# define EV_USEV_POLL 0 /* poll is usually slower than select, and not as well tested */
		65	#endif
		66
		67	#ifndef EV_USE_EPOLL
		68	# define EV_USE_EPOLL 0
		69	#endif
		70
		71	#ifndef EV_USE_KQUEUE
		72	# define EV_USE_KQUEUE 0
		73	#endif
		74
		75	#ifndef EV_USE_REALTIME
		76	# define EV_USE_REALTIME 1
		77	#endif
		78
		79	/**/
		80
15	# ifdef CLOCK_MONOTONIC	81	#ifndef CLOCK_MONOTONIC
		82	# undef EV_USE_MONOTONIC
16	# define HAVE_MONOTONIC 1	83	# define EV_USE_MONOTONIC 0
17	# endif	84	#endif
18	#endif
19		85
20	#ifndef HAVE_SELECT
21	# define HAVE_SELECT 1
22	#endif
23
24	#ifndef HAVE_EPOLL
25	# define HAVE_EPOLL 0
26	#endif
27
28	#ifndef HAVE_REALTIME	86	#ifndef CLOCK_REALTIME
29	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	87	# undef EV_USE_REALTIME
		88	# define EV_USE_REALTIME 0
30	#endif	89	#endif
		90
		91	/**/
31		92
32	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	93	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
33	#define MAX_BLOCKTIME 60.	94	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		95	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		96	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
34		97
35	#include "ev.h"	98	#include "ev.h"
36		99
37	struct ev_watcher {	100	#if __GNUC__ >= 3
38	EV_WATCHER (ev_watcher);	101	# define expect(expr,value) __builtin_expect ((expr),(value))
39	};	102	# define inline inline
		103	#else
		104	# define expect(expr,value) (expr)
		105	# define inline static
		106	#endif
40		107
41	struct ev_watcher_list {	108	#define expect_false(expr) expect ((expr) != 0, 0)
42	EV_WATCHER_LIST (ev_watcher_list);	109	#define expect_true(expr) expect ((expr) != 0, 1)
43	};	110
		111	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		112	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
44		113
45	typedef struct ev_watcher *W;	114	typedef struct ev_watcher *W;
46	typedef struct ev_watcher_list *WL;	115	typedef struct ev_watcher_list *WL;
		116	typedef struct ev_watcher_time *WT;
47		117
48	static ev_tstamp now, diff; /* monotonic clock */	118	static ev_tstamp now_floor, mn_now, diff; /* monotonic clock */
49	ev_tstamp ev_now;	119	static ev_tstamp rt_now;
50	int ev_method;	120	static int method;
51		121
52	static int have_monotonic; /* runtime */	122	static int have_monotonic; /* runtime */
53		123
54	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	124	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
55	static void (*method_modify)(int fd, int oev, int nev);	125	static void (*method_modify)(EV_P_ int fd, int oev, int nev);
56	static void (*method_poll)(ev_tstamp timeout);	126	static void (*method_poll)(EV_P_ ev_tstamp timeout);
		127
		128	static int activecnt; /* number of active events */
		129
		130	#if EV_USE_SELECT
		131	static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo;
		132	static int vec_max;
		133	#endif
		134
		135	#if EV_USEV_POLL
		136	static struct pollfd *polls;
		137	static int pollmax, pollcnt;
		138	static int *pollidxs; /* maps fds into structure indices */
		139	static int pollidxmax;
		140	#endif
		141
		142	#if EV_USE_EPOLL
		143	static int epoll_fd = -1;
		144
		145	static struct epoll_event *events;
		146	static int eventmax;
		147	#endif
		148
		149	#if EV_USE_KQUEUE
		150	static int kqueue_fd;
		151	static struct kevent *kqueue_changes;
		152	static int kqueue_changemax, kqueue_changecnt;
		153	static struct kevent *kqueue_events;
		154	static int kqueue_eventmax;
		155	#endif
57		156
58	/*****************************************************************************/	157	/*****************************************************************************/
59		158
60	ev_tstamp	159	inline ev_tstamp
61	ev_time (void)	160	ev_time (void)
62	{	161	{
63	#if HAVE_REALTIME	162	#if EV_USE_REALTIME
64	struct timespec ts;	163	struct timespec ts;
65	clock_gettime (CLOCK_REALTIME, &ts);	164	clock_gettime (CLOCK_REALTIME, &ts);
66	return ts.tv_sec + ts.tv_nsec * 1e-9;	165	return ts.tv_sec + ts.tv_nsec * 1e-9;
67	#else	166	#else
68	struct timeval tv;	167	struct timeval tv;
69	gettimeofday (&tv, 0);	168	gettimeofday (&tv, 0);
70	return tv.tv_sec + tv.tv_usec * 1e-6;	169	return tv.tv_sec + tv.tv_usec * 1e-6;
71	#endif	170	#endif
72	}	171	}
73		172
74	static ev_tstamp	173	inline ev_tstamp
75	get_clock (void)	174	get_clock (void)
76	{	175	{
77	#if HAVE_MONOTONIC	176	#if EV_USE_MONOTONIC
78	if (have_monotonic)	177	if (expect_true (have_monotonic))
79	{	178	{
80	struct timespec ts;	179	struct timespec ts;
81	clock_gettime (CLOCK_MONOTONIC, &ts);	180	clock_gettime (CLOCK_MONOTONIC, &ts);
82	return ts.tv_sec + ts.tv_nsec * 1e-9;	181	return ts.tv_sec + ts.tv_nsec * 1e-9;
83	}	182	}
84	#endif	183	#endif
85		184
86	return ev_time ();	185	return ev_time ();
87	}	186	}
88		187
		188	ev_tstamp
		189	ev_now (EV_P)
		190	{
		191	return rt_now;
		192	}
		193
		194	#define array_roundsize(base,n) ((n) | 4 & ~3)
		195
89	#define array_needsize(base,cur,cnt,init) \	196	#define array_needsize(base,cur,cnt,init) \
90	if ((cnt) > cur) \	197	if (expect_false ((cnt) > cur)) \
91	{ \	198	{ \
92	int newcnt = cur ? cur << 1 : 16; \	199	int newcnt = cur; \
93	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	200	do \
		201	{ \
		202	newcnt = array_roundsize (base, newcnt << 1); \
		203	} \
		204	while ((cnt) > newcnt); \
		205	\
94	base = realloc (base, sizeof (*base) * (newcnt)); \	206	base = realloc (base, sizeof (*base) * (newcnt)); \
95	init (base + cur, newcnt - cur); \	207	init (base + cur, newcnt - cur); \
96	cur = newcnt; \	208	cur = newcnt; \
97	}	209	}
98		210
99	/*****************************************************************************/	211	/*****************************************************************************/
100		212
101	typedef struct	213	typedef struct
102	{	214	{
103	struct ev_io *head;	215	struct ev_watcher_list *head;
104	unsigned char wev, rev; /* want, received event set */	216	unsigned char events;
		217	unsigned char reify;
105	} ANFD;	218	} ANFD;
106		219
107	static ANFD *anfds;	220	static ANFD *anfds;
108	static int anfdmax;	221	static int anfdmax;
109		222
110	static int *fdchanges;
111	static int fdchangemax, fdchangecnt;
112
113	static void	223	static void
114	anfds_init (ANFD *base, int count)	224	anfds_init (ANFD *base, int count)
115	{	225	{
116	while (count--)	226	while (count--)
117	{	227	{
118	base->head = 0;	228	base->head = 0;
119	base->wev = base->rev = EV_NONE;	229	base->events = EV_NONE;
		230	base->reify = 0;
		231
120	++base;	232	++base;
121	}	233	}
122	}	234	}
123		235
124	typedef struct	236	typedef struct
125	{	237	{
126	W w;	238	W w;
127	int events;	239	int events;
128	} ANPENDING;	240	} ANPENDING;
129		241
130	static ANPENDING *pendings;	242	static ANPENDING *pendings [NUMPRI];
131	static int pendingmax, pendingcnt;	243	static int pendingmax [NUMPRI], pendingcnt [NUMPRI];
132		244
133	static void	245	static void
134	event (W w, int events)	246	event (EV_P_ W w, int events)
135	{	247	{
		248	if (w->pending)
		249	{
		250	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		251	return;
		252	}
		253
136	w->pending = ++pendingcnt;	254	w->pending = ++pendingcnt [ABSPRI (w)];
137	array_needsize (pendings, pendingmax, pendingcnt, );	255	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
138	pendings [pendingcnt - 1].w = w;	256	pendings [ABSPRI (w)][w->pending - 1].w = w;
139	pendings [pendingcnt - 1].events = events;	257	pendings [ABSPRI (w)][w->pending - 1].events = events;
140	}	258	}
141		259
142	static void	260	static void
		261	queue_events (EV_P_ W *events, int eventcnt, int type)
		262	{
		263	int i;
		264
		265	for (i = 0; i < eventcnt; ++i)
		266	event (EV_A_ events [i], type);
		267	}
		268
		269	static void
143	fd_event (int fd, int events)	270	fd_event (EV_P_ int fd, int events)
144	{	271	{
145	ANFD *anfd = anfds + fd;	272	ANFD *anfd = anfds + fd;
146	struct ev_io *w;	273	struct ev_io *w;
147		274
148	for (w = anfd->head; w; w = w->next)	275	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
149	{	276	{
150	int ev = w->events & events;	277	int ev = w->events & events;
151		278
152	if (ev)	279	if (ev)
153	event ((W)w, ev);	280	event (EV_A_ (W)w, ev);
154	}	281	}
155	}	282	}
156		283
		284	/*****************************************************************************/
		285
		286	static int *fdchanges;
		287	static int fdchangemax, fdchangecnt;
		288
157	static void	289	static void
158	queue_events (W *events, int eventcnt, int type)	290	fd_reify (EV_P)
159	{	291	{
160	int i;	292	int i;
161		293
162	for (i = 0; i < eventcnt; ++i)	294	for (i = 0; i < fdchangecnt; ++i)
163	event (events [i], type);	295	{
		296	int fd = fdchanges [i];
		297	ANFD *anfd = anfds + fd;
		298	struct ev_io *w;
		299
		300	int events = 0;
		301
		302	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		303	events |= w->events;
		304
		305	anfd->reify = 0;
		306
		307	if (anfd->events != events)
		308	{
		309	method_modify (EV_A_ fd, anfd->events, events);
		310	anfd->events = events;
		311	}
		312	}
		313
		314	fdchangecnt = 0;
		315	}
		316
		317	static void
		318	fd_change (EV_P_ int fd)
		319	{
		320	if (anfds [fd].reify || fdchangecnt < 0)
		321	return;
		322
		323	anfds [fd].reify = 1;
		324
		325	++fdchangecnt;
		326	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		327	fdchanges [fdchangecnt - 1] = fd;
		328	}
		329
		330	static void
		331	fd_kill (EV_P_ int fd)
		332	{
		333	struct ev_io *w;
		334
		335	while ((w = (struct ev_io *)anfds [fd].head))
		336	{
		337	ev_io_stop (EV_A_ w);
		338	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		339	}
		340	}
		341
		342	/* called on EBADF to verify fds */
		343	static void
		344	fd_ebadf (EV_P)
		345	{
		346	int fd;
		347
		348	for (fd = 0; fd < anfdmax; ++fd)
		349	if (anfds [fd].events)
		350	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		351	fd_kill (EV_A_ fd);
		352	}
		353
		354	/* called on ENOMEM in select/poll to kill some fds and retry */
		355	static void
		356	fd_enomem (EV_P)
		357	{
		358	int fd = anfdmax;
		359
		360	while (fd--)
		361	if (anfds [fd].events)
		362	{
		363	close (fd);
		364	fd_kill (EV_A_ fd);
		365	return;
		366	}
164	}	367	}
165		368
166	/*****************************************************************************/	369	/*****************************************************************************/
167		370
168	static struct ev_timer **atimers;	371	static struct ev_timer **timers;
169	static int atimermax, atimercnt;	372	static int timermax, timercnt;
170		373
171	static struct ev_timer **rtimers;	374	static struct ev_periodic **periodics;
172	static int rtimermax, rtimercnt;	375	static int periodicmax, periodiccnt;
173		376
174	static void	377	static void
175	upheap (struct ev_timer **timers, int k)	378	upheap (WT *timers, int k)
176	{	379	{
177	struct ev_timer *w = timers [k];	380	WT w = timers [k];
178		381
179	while (k && timers [k >> 1]->at > w->at)	382	while (k && timers [k >> 1]->at > w->at)
180	{	383	{
181	timers [k] = timers [k >> 1];	384	timers [k] = timers [k >> 1];
182	timers [k]->active = k + 1;	385	timers [k]->active = k + 1;
…		…
187	timers [k]->active = k + 1;	390	timers [k]->active = k + 1;
188		391
189	}	392	}
190		393
191	static void	394	static void
192	downheap (struct ev_timer **timers, int N, int k)	395	downheap (WT *timers, int N, int k)
193	{	396	{
194	struct ev_timer *w = timers [k];	397	WT w = timers [k];
195		398
196	while (k < (N >> 1))	399	while (k < (N >> 1))
197	{	400	{
198	int j = k << 1;	401	int j = k << 1;
199		402
…		…
214		417
215	/*****************************************************************************/	418	/*****************************************************************************/
216		419
217	typedef struct	420	typedef struct
218	{	421	{
219	struct ev_signal *head;	422	struct ev_watcher_list *head;
220	sig_atomic_t gotsig;	423	sig_atomic_t volatile gotsig;
221	} ANSIG;	424	} ANSIG;
222		425
223	static ANSIG *signals;	426	static ANSIG *signals;
224	static int signalmax;	427	static int signalmax;
225		428
226	static int sigpipe [2];	429	static int sigpipe [2];
227	static sig_atomic_t gotsig;	430	static sig_atomic_t volatile gotsig;
228	static struct ev_io sigev;	431	static struct ev_io sigev;
229		432
230	static void	433	static void
231	signals_init (ANSIG *base, int count)	434	signals_init (ANSIG *base, int count)
232	{	435	{
233	while (count--)	436	while (count--)
234	{	437	{
235	base->head = 0;	438	base->head = 0;
236	base->gotsig = 0;	439	base->gotsig = 0;
		440
237	++base;	441	++base;
238	}	442	}
239	}	443	}
240		444
241	static void	445	static void
…		…
243	{	447	{
244	signals [signum - 1].gotsig = 1;	448	signals [signum - 1].gotsig = 1;
245		449
246	if (!gotsig)	450	if (!gotsig)
247	{	451	{
		452	int old_errno = errno;
248	gotsig = 1;	453	gotsig = 1;
249	write (sigpipe [1], &gotsig, 1);	454	write (sigpipe [1], &signum, 1);
		455	errno = old_errno;
250	}	456	}
251	}	457	}
252		458
253	static void	459	static void
254	sigcb (struct ev_io *iow, int revents)	460	sigcb (EV_P_ struct ev_io *iow, int revents)
255	{	461	{
256	struct ev_signal *w;	462	struct ev_watcher_list *w;
257	int sig;	463	int signum;
258		464
		465	read (sigpipe [0], &revents, 1);
259	gotsig = 0;	466	gotsig = 0;
260	read (sigpipe [0], &revents, 1);
261		467
262	for (sig = signalmax; sig--; )	468	for (signum = signalmax; signum--; )
263	if (signals [sig].gotsig)	469	if (signals [signum].gotsig)
264	{	470	{
265	signals [sig].gotsig = 0;	471	signals [signum].gotsig = 0;
266		472
267	for (w = signals [sig].head; w; w = w->next)	473	for (w = signals [signum].head; w; w = w->next)
268	event ((W)w, EV_SIGNAL);	474	event (EV_A_ (W)w, EV_SIGNAL);
269	}	475	}
270	}	476	}
271		477
272	static void	478	static void
273	siginit (void)	479	siginit (EV_P)
274	{	480	{
		481	#ifndef WIN32
275	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	482	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
276	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	483	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277		484
278	/* rather than sort out wether we really need nb, set it */	485	/* rather than sort out wether we really need nb, set it */
279	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	486	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
280	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	487	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		488	#endif
281		489
282	evio_set (&sigev, sigpipe [0], EV_READ);	490	ev_io_set (&sigev, sigpipe [0], EV_READ);
283	evio_start (&sigev);	491	ev_io_start (&sigev);
		492	ev_unref (EV_A); /* child watcher should not keep loop alive */
284	}	493	}
285		494
286	/*****************************************************************************/	495	/*****************************************************************************/
287		496
288	static struct ev_idle **idles;	497	static struct ev_idle **idles;
289	static int idlemax, idlecnt;	498	static int idlemax, idlecnt;
290		499
		500	static struct ev_prepare **prepares;
		501	static int preparemax, preparecnt;
		502
291	static struct ev_check **checks;	503	static struct ev_check **checks;
292	static int checkmax, checkcnt;	504	static int checkmax, checkcnt;
293		505
294	/*****************************************************************************/	506	/*****************************************************************************/
295		507
		508	static struct ev_child *childs [PID_HASHSIZE];
		509	static struct ev_signal childev;
		510
		511	#ifndef WIN32
		512
		513	#ifndef WCONTINUED
		514	# define WCONTINUED 0
		515	#endif
		516
		517	static void
		518	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		519	{
		520	struct ev_child *w;
		521
		522	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		523	if (w->pid == pid || !w->pid)
		524	{
		525	w->priority = sw->priority; /* need to do it *now* */
		526	w->rpid = pid;
		527	w->rstatus = status;
		528	event (EV_A_ (W)w, EV_CHILD);
		529	}
		530	}
		531
		532	static void
		533	childcb (EV_P_ struct ev_signal *sw, int revents)
		534	{
		535	int pid, status;
		536
		537	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		538	{
		539	/* make sure we are called again until all childs have been reaped */
		540	event (EV_A_ (W)sw, EV_SIGNAL);
		541
		542	child_reap (EV_A_ sw, pid, pid, status);
		543	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		544	}
		545	}
		546
		547	#endif
		548
		549	/*****************************************************************************/
		550
		551	#if EV_USE_KQUEUE
		552	# include "ev_kqueue.c"
		553	#endif
296	#if HAVE_EPOLL	554	#if EV_USE_EPOLL
297	# include "ev_epoll.c"	555	# include "ev_epoll.c"
298	#endif	556	#endif
		557	#if EV_USEV_POLL
		558	# include "ev_poll.c"
		559	#endif
299	#if HAVE_SELECT	560	#if EV_USE_SELECT
300	# include "ev_select.c"	561	# include "ev_select.c"
301	#endif	562	#endif
302		563
303	int ev_init (int flags)	564	int
		565	ev_version_major (void)
304	{	566	{
		567	return EV_VERSION_MAJOR;
		568	}
		569
		570	int
		571	ev_version_minor (void)
		572	{
		573	return EV_VERSION_MINOR;
		574	}
		575
		576	/* return true if we are running with elevated privileges and should ignore env variables */
		577	static int
		578	enable_secure (void)
		579	{
		580	#ifdef WIN32
		581	return 0;
		582	#else
		583	return getuid () != geteuid ()
		584	|| getgid () != getegid ();
		585	#endif
		586	}
		587
		588	int
		589	ev_method (EV_P)
		590	{
		591	return method;
		592	}
		593
		594	int
		595	ev_init (EV_P_ int methods)
		596	{
		597	if (!method)
		598	{
305	#if HAVE_MONOTONIC	599	#if EV_USE_MONOTONIC
306	{	600	{
307	struct timespec ts;	601	struct timespec ts;
308	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	602	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309	have_monotonic = 1;	603	have_monotonic = 1;
310	}	604	}
311	#endif	605	#endif
312		606
313	ev_now = ev_time ();	607	rt_now = ev_time ();
314	now = get_clock ();	608	mn_now = get_clock ();
		609	now_floor = mn_now;
315	diff = ev_now - now;	610	diff = rt_now - mn_now;
316		611
317	if (pipe (sigpipe))	612	if (pipe (sigpipe))
318	return 0;	613	return 0;
319		614
320	ev_method = EVMETHOD_NONE;	615	if (methods == EVMETHOD_AUTO)
		616	if (!enable_secure () && getenv ("LIBmethodS"))
		617	methods = atoi (getenv ("LIBmethodS"));
		618	else
		619	methods = EVMETHOD_ANY;
		620
		621	method = 0;
		622	#if EV_USE_KQUEUE
		623	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		624	#endif
321	#if HAVE_EPOLL	625	#if EV_USE_EPOLL
322	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	626	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
323	#endif	627	#endif
		628	#if EV_USEV_POLL
		629	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		630	#endif
324	#if HAVE_SELECT	631	#if EV_USE_SELECT
325	if (ev_method == EVMETHOD_NONE) select_init (flags);	632	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
326	#endif	633	#endif
327		634
328	if (ev_method)	635	if (method)
329	{	636	{
330	evw_init (&sigev, sigcb, 0);	637	ev_watcher_init (&sigev, sigcb);
		638	ev_set_priority (&sigev, EV_MAXPRI);
331	siginit ();	639	siginit (EV_A);
332	}
333		640
		641	#ifndef WIN32
		642	ev_signal_init (&childev, childcb, SIGCHLD);
		643	ev_set_priority (&childev, EV_MAXPRI);
		644	ev_signal_start (EV_A_ &childev);
		645	ev_unref (EV_A); /* child watcher should not keep loop alive */
		646	#endif
		647	}
		648	}
		649
334	return ev_method;	650	return method;
335	}	651	}
336		652
337	/*****************************************************************************/	653	/*****************************************************************************/
338		654
339	void ev_prefork (void)	655	void
		656	ev_fork_prepare (void)
340	{	657	{
		658	/* nop */
341	}	659	}
342		660
		661	void
343	void ev_postfork_parent (void)	662	ev_fork_parent (void)
344	{	663	{
		664	/* nop */
345	}	665	}
346		666
		667	void
347	void ev_postfork_child (void)	668	ev_fork_child (void)
348	{	669	{
349	#if HAVE_EPOLL	670	#if EV_USE_EPOLL
350	if (ev_method == EVMETHOD_EPOLL)	671	if (method == EVMETHOD_EPOLL)
351	epoll_postfork_child ();	672	epoll_postfork_child ();
352	#endif	673	#endif
353		674
354	evio_stop (&sigev);	675	ev_io_stop (&sigev);
355	close (sigpipe [0]);	676	close (sigpipe [0]);
356	close (sigpipe [1]);	677	close (sigpipe [1]);
357	pipe (sigpipe);	678	pipe (sigpipe);
358	siginit ();	679	siginit ();
359	}	680	}
360		681
361	/*****************************************************************************/	682	/*****************************************************************************/
362		683
363	static void	684	static void
364	fd_reify (void)	685	call_pending (EV_P)
365	{	686	{
366	int i;	687	int pri;
367		688
368	for (i = 0; i < fdchangecnt; ++i)	689	for (pri = NUMPRI; pri--; )
369	{	690	while (pendingcnt [pri])
370	int fd = fdchanges [i];
371	ANFD *anfd = anfds + fd;
372	struct ev_io *w;
373
374	int wev = 0;
375
376	for (w = anfd->head; w; w = w->next)
377	wev |= w->events;
378
379	if (anfd->wev != wev)
380	{	691	{
381	method_modify (fd, anfd->wev, wev);	692	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
382	anfd->wev = wev;
383	}
384	}
385		693
386	fdchangecnt = 0;
387	}
388
389	static void
390	call_pending ()
391	{
392	int i;
393
394	for (i = 0; i < pendingcnt; ++i)
395	{
396	ANPENDING *p = pendings + i;
397
398	if (p->w)	694	if (p->w)
399	{	695	{
400	p->w->pending = 0;	696	p->w->pending = 0;
401	p->w->cb (p->w, p->events);	697	p->w->cb (EV_A_ p->w, p->events);
402	}	698	}
403	}	699	}
404
405	pendingcnt = 0;
406	}	700	}
407		701
408	static void	702	static void
409	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	703	timers_reify (EV_P)
410	{	704	{
411	while (timercnt && timers [0]->at <= now)	705	while (timercnt && timers [0]->at <= mn_now)
412	{	706	{
413	struct ev_timer *w = timers [0];	707	struct ev_timer *w = timers [0];
414		708
415	/* first reschedule or stop timer */	709	/* first reschedule or stop timer */
416	if (w->repeat)	710	if (w->repeat)
417	{	711	{
418	if (w->is_abs)	712	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
419	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
420	else
421	w->at = now + w->repeat;	713	w->at = mn_now + w->repeat;
422
423	assert (w->at > now);
424
425	downheap (timers, timercnt, 0);	714	downheap ((WT *)timers, timercnt, 0);
426	}	715	}
427	else	716	else
		717	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		718
		719	event ((W)w, EV_TIMEOUT);
		720	}
		721	}
		722
		723	static void
		724	periodics_reify (EV_P)
		725	{
		726	while (periodiccnt && periodics [0]->at <= rt_now)
		727	{
		728	struct ev_periodic *w = periodics [0];
		729
		730	/* first reschedule or stop timer */
		731	if (w->interval)
428	{	732	{
429	evtimer_stop (w); /* nonrepeating: stop timer */	733	w->at += floor ((rt_now - w->at) / w->interval + 1.) * w->interval;
430	--timercnt; /* maybe pass by reference instead? */	734	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > rt_now));
		735	downheap ((WT *)periodics, periodiccnt, 0);
431	}	736	}
		737	else
		738	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
432		739
433	event ((W)w, EV_TIMEOUT);	740	event (EV_A_ (W)w, EV_PERIODIC);
434	}	741	}
435	}	742	}
436		743
437	static void	744	static void
438	time_update ()	745	periodics_reschedule (EV_P_ ev_tstamp diff)
439	{	746	{
440	int i;	747	int i;
441	ev_now = ev_time ();
442		748
443	if (have_monotonic)	749	/* adjust periodics after time jump */
		750	for (i = 0; i < periodiccnt; ++i)
444	{	751	{
445	ev_tstamp odiff = diff;	752	struct ev_periodic *w = periodics [i];
446		753
447	/* detecting time jumps is much more difficult */	754	if (w->interval)
448	for (i = 2; --i; ) /* loop a few times, before making important decisions */
449	{	755	{
450	now = get_clock ();	756	ev_tstamp diff = ceil ((rt_now - w->at) / w->interval) * w->interval;
451	diff = ev_now - now;
452		757
453	if (fabs (odiff - diff) < MIN_TIMEJUMP)	758	if (fabs (diff) >= 1e-4)
454	return; /* all is well */	759	{
		760	ev_periodic_stop (EV_A_ w);
		761	ev_periodic_start (EV_A_ w);
455		762
456	ev_now = ev_time ();	763	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		764	}
457	}	765	}
		766	}
		767	}
458		768
459	/* time jump detected, reschedule atimers */	769	inline int
460	for (i = 0; i < atimercnt; ++i)	770	time_update_monotonic (EV_P)
		771	{
		772	mn_now = get_clock ();
		773
		774	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		775	{
		776	rt_now = mn_now + diff;
		777	return 0;
		778	}
		779	else
		780	{
		781	now_floor = mn_now;
		782	rt_now = ev_time ();
		783	return 1;
		784	}
		785	}
		786
		787	static void
		788	time_update (EV_P)
		789	{
		790	int i;
		791
		792	#if EV_USE_MONOTONIC
		793	if (expect_true (have_monotonic))
		794	{
		795	if (time_update_monotonic (EV_A))
461	{	796	{
462	struct ev_timer *w = atimers [i];	797	ev_tstamp odiff = diff;
463	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	798
		799	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		800	{
		801	diff = rt_now - mn_now;
		802
		803	if (fabs (odiff - diff) < MIN_TIMEJUMP)
		804	return; /* all is well */
		805
		806	rt_now = ev_time ();
		807	mn_now = get_clock ();
		808	now_floor = mn_now;
		809	}
		810
		811	periodics_reschedule (EV_A_ diff - odiff);
		812	/* no timer adjustment, as the monotonic clock doesn't jump */
464	}	813	}
465	}	814	}
466	else	815	else
		816	#endif
467	{	817	{
468	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	818	rt_now = ev_time ();
469	/* time jump detected, adjust rtimers */	819
		820	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		821	{
		822	periodics_reschedule (EV_A_ rt_now - mn_now);
		823
		824	/* adjust timers. this is easy, as the offset is the same for all */
470	for (i = 0; i < rtimercnt; ++i)	825	for (i = 0; i < timercnt; ++i)
471	rtimers [i]->at += ev_now - now;	826	timers [i]->at += diff;
		827	}
472		828
473	now = ev_now;	829	mn_now = rt_now;
474	}	830	}
475	}	831	}
476		832
477	int ev_loop_done;	833	void
		834	ev_ref (EV_P)
		835	{
		836	++activecnt;
		837	}
478		838
		839	void
		840	ev_unref (EV_P)
		841	{
		842	--activecnt;
		843	}
		844
		845	static int loop_done;
		846
		847	void
479	void ev_loop (int flags)	848	ev_loop (EV_P_ int flags)
480	{	849	{
481	double block;	850	double block;
482	ev_loop_done = flags & EVLOOP_ONESHOT;	851	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
483
484	if (checkcnt)
485	{
486	queue_events ((W *)checks, checkcnt, EV_CHECK);
487	call_pending ();
488	}
489		852
490	do	853	do
491	{	854	{
		855	/* queue check watchers (and execute them) */
		856	if (expect_false (preparecnt))
		857	{
		858	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		859	call_pending (EV_A);
		860	}
		861
492	/* update fd-related kernel structures */	862	/* update fd-related kernel structures */
493	fd_reify ();	863	fd_reify (EV_A);
494		864
495	/* calculate blocking time */	865	/* calculate blocking time */
		866
		867	/* we only need this for !monotonic clockor timers, but as we basically
		868	always have timers, we just calculate it always */
		869	#if EV_USE_MONOTONIC
		870	if (expect_true (have_monotonic))
		871	time_update_monotonic (EV_A);
		872	else
		873	#endif
		874	{
		875	rt_now = ev_time ();
		876	mn_now = rt_now;
		877	}
		878
496	if (flags & EVLOOP_NONBLOCK || idlecnt)	879	if (flags & EVLOOP_NONBLOCK || idlecnt)
497	block = 0.;	880	block = 0.;
498	else	881	else
499	{	882	{
500	block = MAX_BLOCKTIME;	883	block = MAX_BLOCKTIME;
501		884
502	if (rtimercnt)	885	if (timercnt)
503	{	886	{
504	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	887	ev_tstamp to = timers [0]->at - mn_now + method_fudge;
505	if (block > to) block = to;	888	if (block > to) block = to;
506	}	889	}
507		890
508	if (atimercnt)	891	if (periodiccnt)
509	{	892	{
510	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	893	ev_tstamp to = periodics [0]->at - rt_now + method_fudge;
511	if (block > to) block = to;	894	if (block > to) block = to;
512	}	895	}
513		896
514	if (block < 0.) block = 0.;	897	if (block < 0.) block = 0.;
515	}	898	}
516		899
517	method_poll (block);	900	method_poll (EV_A_ block);
518		901
519	/* update ev_now, do magic */	902	/* update rt_now, do magic */
520	time_update ();	903	time_update (EV_A);
521		904
522	/* queue pending timers and reschedule them */	905	/* queue pending timers and reschedule them */
523	/* absolute timers first */	906	timers_reify (EV_A); /* relative timers called last */
524	timers_reify (atimers, atimercnt, ev_now);	907	periodics_reify (EV_A); /* absolute timers called first */
525	/* relative timers second */
526	timers_reify (rtimers, rtimercnt, now);
527		908
528	/* queue idle watchers unless io or timers are pending */	909	/* queue idle watchers unless io or timers are pending */
529	if (!pendingcnt)	910	if (!pendingcnt)
530	queue_events ((W *)idles, idlecnt, EV_IDLE);	911	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
531		912
532	/* queue check and possibly idle watchers */	913	/* queue check watchers, to be executed first */
		914	if (checkcnt)
533	queue_events ((W *)checks, checkcnt, EV_CHECK);	915	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
534		916
535	call_pending ();	917	call_pending (EV_A);
536	}	918	}
537	while (!ev_loop_done);	919	while (activecnt && !loop_done);
		920
		921	if (loop_done != 2)
		922	loop_done = 0;
		923	}
		924
		925	void
		926	ev_unloop (EV_P_ int how)
		927	{
		928	loop_done = how;
538	}	929	}
539		930
540	/*****************************************************************************/	931	/*****************************************************************************/
541		932
542	static void	933	inline void
543	wlist_add (WL *head, WL elem)	934	wlist_add (WL *head, WL elem)
544	{	935	{
545	elem->next = *head;	936	elem->next = *head;
546	*head = elem;	937	*head = elem;
547	}	938	}
548		939
549	static void	940	inline void
550	wlist_del (WL *head, WL elem)	941	wlist_del (WL *head, WL elem)
551	{	942	{
552	while (*head)	943	while (*head)
553	{	944	{
554	if (*head == elem)	945	if (*head == elem)
…		…
559		950
560	head = &(*head)->next;	951	head = &(*head)->next;
561	}	952	}
562	}	953	}
563		954
564	static void	955	inline void
		956	ev_clear_pending (EV_P_ W w)
		957	{
		958	if (w->pending)
		959	{
		960	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		961	w->pending = 0;
		962	}
		963	}
		964
		965	inline void
565	ev_start (W w, int active)	966	ev_start (EV_P_ W w, int active)
566	{	967	{
567	w->pending = 0;	968	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		969	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		970
568	w->active = active;	971	w->active = active;
		972	ev_ref (EV_A);
569	}	973	}
570		974
571	static void	975	inline void
572	ev_stop (W w)	976	ev_stop (EV_P_ W w)
573	{	977	{
574	if (w->pending)	978	ev_unref (EV_A);
575	pendings [w->pending - 1].w = 0;
576
577	w->active = 0;	979	w->active = 0;
578	/* nop */
579	}	980	}
580		981
581	/*****************************************************************************/	982	/*****************************************************************************/
582		983
583	void	984	void
584	evio_start (struct ev_io *w)	985	ev_io_start (EV_P_ struct ev_io *w)
585	{	986	{
		987	int fd = w->fd;
		988
586	if (ev_is_active (w))	989	if (ev_is_active (w))
587	return;	990	return;
588		991
589	int fd = w->fd;	992	assert (("ev_io_start called with negative fd", fd >= 0));
590		993
591	ev_start ((W)w, 1);	994	ev_start (EV_A_ (W)w, 1);
592	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	995	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
593	wlist_add ((WL *)&anfds[fd].head, (WL)w);	996	wlist_add ((WL *)&anfds[fd].head, (WL)w);
594		997
595	++fdchangecnt;	998	fd_change (EV_A_ fd);
596	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
597	fdchanges [fdchangecnt - 1] = fd;
598	}	999	}
599		1000
600	void	1001	void
601	evio_stop (struct ev_io *w)	1002	ev_io_stop (EV_P_ struct ev_io *w)
602	{	1003	{
		1004	ev_clear_pending (EV_A_ (W)w);
603	if (!ev_is_active (w))	1005	if (!ev_is_active (w))
604	return;	1006	return;
605		1007
606	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1008	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
607	ev_stop ((W)w);	1009	ev_stop (EV_A_ (W)w);
608		1010
609	++fdchangecnt;	1011	fd_change (EV_A_ w->fd);
610	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
611	fdchanges [fdchangecnt - 1] = w->fd;
612	}	1012	}
613		1013
614	void	1014	void
615	evtimer_start (struct ev_timer *w)	1015	ev_timer_start (EV_P_ struct ev_timer *w)
616	{	1016	{
617	if (ev_is_active (w))	1017	if (ev_is_active (w))
618	return;	1018	return;
619		1019
620	if (w->is_abs)	1020	w->at += mn_now;
		1021
		1022	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1023
		1024	ev_start (EV_A_ (W)w, ++timercnt);
		1025	array_needsize (timers, timermax, timercnt, );
		1026	timers [timercnt - 1] = w;
		1027	upheap ((WT *)timers, timercnt - 1);
		1028	}
		1029
		1030	void
		1031	ev_timer_stop (EV_P_ struct ev_timer *w)
		1032	{
		1033	ev_clear_pending (EV_A_ (W)w);
		1034	if (!ev_is_active (w))
		1035	return;
		1036
		1037	if (w->active < timercnt--)
		1038	{
		1039	timers [w->active - 1] = timers [timercnt];
		1040	downheap ((WT *)timers, timercnt, w->active - 1);
621	{	1041	}
622	/* this formula differs from the one in timer_reify becuse we do not round up */	1042
		1043	w->at = w->repeat;
		1044
		1045	ev_stop (EV_A_ (W)w);
		1046	}
		1047
		1048	void
		1049	ev_timer_again (EV_P_ struct ev_timer *w)
		1050	{
		1051	if (ev_is_active (w))
		1052	{
623	if (w->repeat)	1053	if (w->repeat)
624	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1054	{
625		1055	w->at = mn_now + w->repeat;
626	ev_start ((W)w, ++atimercnt);	1056	downheap ((WT *)timers, timercnt, w->active - 1);
627	array_needsize (atimers, atimermax, atimercnt, );	1057	}
628	atimers [atimercnt - 1] = w;
629	upheap (atimers, atimercnt - 1);
630	}
631	else	1058	else
		1059	ev_timer_stop (EV_A_ w);
632	{	1060	}
633	w->at += now;	1061	else if (w->repeat)
634		1062	ev_timer_start (EV_A_ w);
635	ev_start ((W)w, ++rtimercnt);
636	array_needsize (rtimers, rtimermax, rtimercnt, );
637	rtimers [rtimercnt - 1] = w;
638	upheap (rtimers, rtimercnt - 1);
639	}
640
641	}	1063	}
642		1064
643	void	1065	void
644	evtimer_stop (struct ev_timer *w)	1066	ev_periodic_start (EV_P_ struct ev_periodic *w)
645	{	1067	{
		1068	if (ev_is_active (w))
		1069	return;
		1070
		1071	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1072
		1073	/* this formula differs from the one in periodic_reify because we do not always round up */
		1074	if (w->interval)
		1075	w->at += ceil ((rt_now - w->at) / w->interval) * w->interval;
		1076
		1077	ev_start (EV_A_ (W)w, ++periodiccnt);
		1078	array_needsize (periodics, periodicmax, periodiccnt, );
		1079	periodics [periodiccnt - 1] = w;
		1080	upheap ((WT *)periodics, periodiccnt - 1);
		1081	}
		1082
		1083	void
		1084	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1085	{
		1086	ev_clear_pending (EV_A_ (W)w);
646	if (!ev_is_active (w))	1087	if (!ev_is_active (w))
647	return;	1088	return;
648		1089
649	if (w->is_abs)
650	{
651	if (w->active < atimercnt--)	1090	if (w->active < periodiccnt--)
652	{
653	atimers [w->active - 1] = atimers [atimercnt];
654	downheap (atimers, atimercnt, w->active - 1);
655	}
656	}	1091	{
657	else	1092	periodics [w->active - 1] = periodics [periodiccnt];
		1093	downheap ((WT *)periodics, periodiccnt, w->active - 1);
658	{	1094	}
659	if (w->active < rtimercnt--)
660	{
661	rtimers [w->active - 1] = rtimers [rtimercnt];
662	downheap (rtimers, rtimercnt, w->active - 1);
663	}
664	}
665		1095
666	ev_stop ((W)w);	1096	ev_stop (EV_A_ (W)w);
667	}	1097	}
668		1098
		1099	#ifndef SA_RESTART
		1100	# define SA_RESTART 0
		1101	#endif
		1102
669	void	1103	void
670	evsignal_start (struct ev_signal *w)	1104	ev_signal_start (EV_P_ struct ev_signal *w)
671	{	1105	{
672	if (ev_is_active (w))	1106	if (ev_is_active (w))
673	return;	1107	return;
674		1108
		1109	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1110
675	ev_start ((W)w, 1);	1111	ev_start (EV_A_ (W)w, 1);
676	array_needsize (signals, signalmax, w->signum, signals_init);	1112	array_needsize (signals, signalmax, w->signum, signals_init);
677	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1113	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
678		1114
679	if (!w->next)	1115	if (!w->next)
680	{	1116	{
681	struct sigaction sa;	1117	struct sigaction sa;
682	sa.sa_handler = sighandler;	1118	sa.sa_handler = sighandler;
683	sigfillset (&sa.sa_mask);	1119	sigfillset (&sa.sa_mask);
684	sa.sa_flags = 0;	1120	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
685	sigaction (w->signum, &sa, 0);	1121	sigaction (w->signum, &sa, 0);
686	}	1122	}
687	}	1123	}
688		1124
689	void	1125	void
690	evsignal_stop (struct ev_signal *w)	1126	ev_signal_stop (EV_P_ struct ev_signal *w)
691	{	1127	{
		1128	ev_clear_pending (EV_A_ (W)w);
692	if (!ev_is_active (w))	1129	if (!ev_is_active (w))
693	return;	1130	return;
694		1131
695	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1132	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
696	ev_stop ((W)w);	1133	ev_stop (EV_A_ (W)w);
697		1134
698	if (!signals [w->signum - 1].head)	1135	if (!signals [w->signum - 1].head)
699	signal (w->signum, SIG_DFL);	1136	signal (w->signum, SIG_DFL);
700	}	1137	}
701		1138
		1139	void
702	void evidle_start (struct ev_idle *w)	1140	ev_idle_start (EV_P_ struct ev_idle *w)
703	{	1141	{
704	if (ev_is_active (w))	1142	if (ev_is_active (w))
705	return;	1143	return;
706		1144
707	ev_start ((W)w, ++idlecnt);	1145	ev_start (EV_A_ (W)w, ++idlecnt);
708	array_needsize (idles, idlemax, idlecnt, );	1146	array_needsize (idles, idlemax, idlecnt, );
709	idles [idlecnt - 1] = w;	1147	idles [idlecnt - 1] = w;
710	}	1148	}
711		1149
		1150	void
712	void evidle_stop (struct ev_idle *w)	1151	ev_idle_stop (EV_P_ struct ev_idle *w)
713	{	1152	{
		1153	ev_clear_pending (EV_A_ (W)w);
		1154	if (ev_is_active (w))
		1155	return;
		1156
714	idles [w->active - 1] = idles [--idlecnt];	1157	idles [w->active - 1] = idles [--idlecnt];
715	ev_stop ((W)w);	1158	ev_stop (EV_A_ (W)w);
716	}	1159	}
717		1160
718	void evcheck_start (struct ev_check *w)	1161	void
		1162	ev_prepare_start (EV_P_ struct ev_prepare *w)
719	{	1163	{
720	if (ev_is_active (w))	1164	if (ev_is_active (w))
721	return;	1165	return;
722		1166
		1167	ev_start (EV_A_ (W)w, ++preparecnt);
		1168	array_needsize (prepares, preparemax, preparecnt, );
		1169	prepares [preparecnt - 1] = w;
		1170	}
		1171
		1172	void
		1173	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1174	{
		1175	ev_clear_pending (EV_A_ (W)w);
		1176	if (ev_is_active (w))
		1177	return;
		1178
		1179	prepares [w->active - 1] = prepares [--preparecnt];
		1180	ev_stop (EV_A_ (W)w);
		1181	}
		1182
		1183	void
		1184	ev_check_start (EV_P_ struct ev_check *w)
		1185	{
		1186	if (ev_is_active (w))
		1187	return;
		1188
723	ev_start ((W)w, ++checkcnt);	1189	ev_start (EV_A_ (W)w, ++checkcnt);
724	array_needsize (checks, checkmax, checkcnt, );	1190	array_needsize (checks, checkmax, checkcnt, );
725	checks [checkcnt - 1] = w;	1191	checks [checkcnt - 1] = w;
726	}	1192	}
727		1193
		1194	void
728	void evcheck_stop (struct ev_check *w)	1195	ev_check_stop (EV_P_ struct ev_check *w)
729	{	1196	{
		1197	ev_clear_pending (EV_A_ (W)w);
		1198	if (ev_is_active (w))
		1199	return;
		1200
730	checks [w->active - 1] = checks [--checkcnt];	1201	checks [w->active - 1] = checks [--checkcnt];
731	ev_stop ((W)w);	1202	ev_stop (EV_A_ (W)w);
		1203	}
		1204
		1205	void
		1206	ev_child_start (EV_P_ struct ev_child *w)
		1207	{
		1208	if (ev_is_active (w))
		1209	return;
		1210
		1211	ev_start (EV_A_ (W)w, 1);
		1212	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1213	}
		1214
		1215	void
		1216	ev_child_stop (EV_P_ struct ev_child *w)
		1217	{
		1218	ev_clear_pending (EV_A_ (W)w);
		1219	if (ev_is_active (w))
		1220	return;
		1221
		1222	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1223	ev_stop (EV_A_ (W)w);
732	}	1224	}
733		1225
734	/*****************************************************************************/	1226	/*****************************************************************************/
735		1227
		1228	struct ev_once
		1229	{
		1230	struct ev_io io;
		1231	struct ev_timer to;
		1232	void (*cb)(int revents, void *arg);
		1233	void *arg;
		1234	};
		1235
		1236	static void
		1237	once_cb (EV_P_ struct ev_once *once, int revents)
		1238	{
		1239	void (*cb)(int revents, void *arg) = once->cb;
		1240	void *arg = once->arg;
		1241
		1242	ev_io_stop (EV_A_ &once->io);
		1243	ev_timer_stop (EV_A_ &once->to);
		1244	free (once);
		1245
		1246	cb (revents, arg);
		1247	}
		1248
		1249	static void
		1250	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1251	{
		1252	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1253	}
		1254
		1255	static void
		1256	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1257	{
		1258	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1259	}
		1260
		1261	void
		1262	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1263	{
		1264	struct ev_once *once = malloc (sizeof (struct ev_once));
		1265
		1266	if (!once)
		1267	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1268	else
		1269	{
		1270	once->cb = cb;
		1271	once->arg = arg;
		1272
		1273	ev_watcher_init (&once->io, once_cb_io);
		1274	if (fd >= 0)
		1275	{
		1276	ev_io_set (&once->io, fd, events);
		1277	ev_io_start (EV_A_ &once->io);
		1278	}
		1279
		1280	ev_watcher_init (&once->to, once_cb_to);
		1281	if (timeout >= 0.)
		1282	{
		1283	ev_timer_set (&once->to, timeout, 0.);
		1284	ev_timer_start (EV_A_ &once->to);
		1285	}
		1286	}
		1287	}
		1288
		1289	/*****************************************************************************/
		1290
736	#if 0	1291	#if 0
737		1292
		1293	struct ev_io wio;
		1294
738	static void	1295	static void
739	sin_cb (struct ev_io *w, int revents)	1296	sin_cb (struct ev_io *w, int revents)
740	{	1297	{
741	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1298	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
742	}	1299	}
743		1300
744	static void	1301	static void
745	ocb (struct ev_timer *w, int revents)	1302	ocb (struct ev_timer *w, int revents)
746	{	1303	{
747	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1304	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
748	evtimer_stop (w);	1305	ev_timer_stop (w);
749	evtimer_start (w);	1306	ev_timer_start (w);
750	}	1307	}
751		1308
752	static void	1309	static void
753	scb (struct ev_signal *w, int revents)	1310	scb (struct ev_signal *w, int revents)
754	{	1311	{
755	fprintf (stderr, "signal %x,%d\n", revents, w->signum);	1312	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
		1313	ev_io_stop (&wio);
		1314	ev_io_start (&wio);
756	}	1315	}
757		1316
758	static void	1317	static void
759	gcb (struct ev_signal *w, int revents)	1318	gcb (struct ev_signal *w, int revents)
760	{	1319	{
761	fprintf (stderr, "generic %x\n", revents);	1320	fprintf (stderr, "generic %x\n", revents);
		1321
762	}	1322	}
763		1323
764	int main (void)	1324	int main (void)
765	{	1325	{
766	struct ev_io sin;
767
768	ev_init (0);	1326	ev_init (0);
769		1327
770	evw_init (&sin, sin_cb, 55);
771	evio_set (&sin, 0, EV_READ);	1328	ev_io_init (&wio, sin_cb, 0, EV_READ);
772	evio_start (&sin);	1329	ev_io_start (&wio);
773		1330
774	struct ev_timer t[10000];	1331	struct ev_timer t[10000];
775		1332
776	#if 0	1333	#if 0
777	int i;	1334	int i;
778	for (i = 0; i < 10000; ++i)	1335	for (i = 0; i < 10000; ++i)
779	{	1336	{
780	struct ev_timer *w = t + i;	1337	struct ev_timer *w = t + i;
781	evw_init (w, ocb, i);	1338	ev_watcher_init (w, ocb, i);
782	evtimer_set_abs (w, drand48 (), 0.99775533);	1339	ev_timer_init_abs (w, ocb, drand48 (), 0.99775533);
783	evtimer_start (w);	1340	ev_timer_start (w);
784	if (drand48 () < 0.5)	1341	if (drand48 () < 0.5)
785	evtimer_stop (w);	1342	ev_timer_stop (w);
786	}	1343	}
787	#endif	1344	#endif
788		1345
789	struct ev_timer t1;	1346	struct ev_timer t1;
790	evw_init (&t1, ocb, 0);	1347	ev_timer_init (&t1, ocb, 5, 10);
791	evtimer_set_abs (&t1, 5, 10);
792	evtimer_start (&t1);	1348	ev_timer_start (&t1);
793		1349
794	struct ev_signal sig;	1350	struct ev_signal sig;
795	evw_init (&sig, scb, 65535);
796	evsignal_set (&sig, SIGQUIT);	1351	ev_signal_init (&sig, scb, SIGQUIT);
797	evsignal_start (&sig);	1352	ev_signal_start (&sig);
798		1353
799	struct ev_check cw;	1354	struct ev_check cw;
800	evw_init (&cw, gcb, 0);	1355	ev_check_init (&cw, gcb);
801	evcheck_start (&cw);	1356	ev_check_start (&cw);
802		1357
803	struct ev_idle iw;	1358	struct ev_idle iw;
804	evw_init (&iw, gcb, 0);	1359	ev_idle_init (&iw, gcb);
805	evidle_start (&iw);	1360	ev_idle_start (&iw);
806		1361
807	ev_loop (0);	1362	ev_loop (0);
808		1363
809	return 0;	1364	return 0;
810	}	1365	}

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