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Comparing libev/ev.c (file contents):
Revision 1.9 by root, Wed Oct 31 07:24:17 2007 UTC vs.
Revision 1.58 by root, Sun Nov 4 16:52:52 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_EMBED
		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
		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
14	#ifdef CLOCK_MONOTONIC	81	#ifndef CLOCK_MONOTONIC
		82	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	83	# define EV_USE_MONOTONIC 0
16	#endif	84	#endif
17		85
		86	#ifndef CLOCK_REALTIME
		87	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	88	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	89	#endif
20	#define HAVE_SELECT 1	90
		91	/**/
21		92
22	#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) */
23	#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 */
24		97
		98	#ifndef EV_EMBED
25	#include "ev.h"	99	# include "ev.h"
		100	#endif
26		101
		102	#if __GNUC__ >= 3
		103	# define expect(expr,value) __builtin_expect ((expr),(value))
		104	# define inline inline
		105	#else
		106	# define expect(expr,value) (expr)
		107	# define inline static
		108	#endif
		109
		110	#define expect_false(expr) expect ((expr) != 0, 0)
		111	#define expect_true(expr) expect ((expr) != 0, 1)
		112
		113	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		114	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		115
27	struct ev_watcher {	116	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);	117	typedef struct ev_watcher_list *WL;
		118	typedef struct ev_watcher_time *WT;
		119
		120	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		121
		122	/*****************************************************************************/
		123
		124	typedef struct
		125	{
		126	struct ev_watcher_list *head;
		127	unsigned char events;
		128	unsigned char reify;
		129	} ANFD;
		130
		131	typedef struct
		132	{
		133	W w;
		134	int events;
		135	} ANPENDING;
		136
		137	#if EV_MULTIPLICITY
		138
		139	struct ev_loop
		140	{
		141	# define VAR(name,decl) decl;
		142	# include "ev_vars.h"
29	};	143	};
		144	# undef VAR
		145	# include "ev_wrap.h"
30		146
31	struct ev_watcher_list {	147	#else
32	EV_WATCHER_LIST (ev_watcher_list);
33	};
34		148
35	static ev_tstamp now, diff; /* monotonic clock */	149	# define VAR(name,decl) static decl;
36	ev_tstamp ev_now;	150	# include "ev_vars.h"
37	int ev_method;	151	# undef VAR
38		152
39	static int have_monotonic; /* runtime */	153	#endif
40
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
42	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);
44		154
45	/*****************************************************************************/	155	/*****************************************************************************/
46		156
47	ev_tstamp	157	inline ev_tstamp
48	ev_time (void)	158	ev_time (void)
49	{	159	{
50	#if HAVE_REALTIME	160	#if EV_USE_REALTIME
51	struct timespec ts;	161	struct timespec ts;
52	clock_gettime (CLOCK_REALTIME, &ts);	162	clock_gettime (CLOCK_REALTIME, &ts);
53	return ts.tv_sec + ts.tv_nsec * 1e-9;	163	return ts.tv_sec + ts.tv_nsec * 1e-9;
54	#else	164	#else
55	struct timeval tv;	165	struct timeval tv;
56	gettimeofday (&tv, 0);	166	gettimeofday (&tv, 0);
57	return tv.tv_sec + tv.tv_usec * 1e-6;	167	return tv.tv_sec + tv.tv_usec * 1e-6;
58	#endif	168	#endif
59	}	169	}
60		170
61	static ev_tstamp	171	inline ev_tstamp
62	get_clock (void)	172	get_clock (void)
63	{	173	{
64	#if HAVE_MONOTONIC	174	#if EV_USE_MONOTONIC
65	if (have_monotonic)	175	if (expect_true (have_monotonic))
66	{	176	{
67	struct timespec ts;	177	struct timespec ts;
68	clock_gettime (CLOCK_MONOTONIC, &ts);	178	clock_gettime (CLOCK_MONOTONIC, &ts);
69	return ts.tv_sec + ts.tv_nsec * 1e-9;	179	return ts.tv_sec + ts.tv_nsec * 1e-9;
70	}	180	}
71	#endif	181	#endif
72		182
73	return ev_time ();	183	return ev_time ();
74	}	184	}
75		185
		186	ev_tstamp
		187	ev_now (EV_P)
		188	{
		189	return rt_now;
		190	}
		191
		192	#define array_roundsize(base,n) ((n) | 4 & ~3)
		193
76	#define array_needsize(base,cur,cnt,init) \	194	#define array_needsize(base,cur,cnt,init) \
77	if ((cnt) > cur) \	195	if (expect_false ((cnt) > cur)) \
78	{ \	196	{ \
79	int newcnt = cur ? cur << 1 : 16; \	197	int newcnt = cur; \
80	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	198	do \
		199	{ \
		200	newcnt = array_roundsize (base, newcnt << 1); \
		201	} \
		202	while ((cnt) > newcnt); \
		203	\
81	base = realloc (base, sizeof (*base) * (newcnt)); \	204	base = realloc (base, sizeof (*base) * (newcnt)); \
82	init (base + cur, newcnt - cur); \	205	init (base + cur, newcnt - cur); \
83	cur = newcnt; \	206	cur = newcnt; \
84	}	207	}
85		208
86	/*****************************************************************************/	209	/*****************************************************************************/
87		210
88	typedef struct
89	{
90	struct ev_io *head;
91	unsigned char wev, rev; /* want, received event set */
92	} ANFD;
93
94	static ANFD *anfds;
95	static int anfdmax;
96
97	static int *fdchanges;
98	static int fdchangemax, fdchangecnt;
99
100	static void	211	static void
101	anfds_init (ANFD *base, int count)	212	anfds_init (ANFD *base, int count)
102	{	213	{
103	while (count--)	214	while (count--)
104	{	215	{
105	base->head = 0;	216	base->head = 0;
106	base->wev = base->rev = EV_NONE;	217	base->events = EV_NONE;
		218	base->reify = 0;
		219
107	++base;	220	++base;
108	}	221	}
109	}	222	}
110		223
111	typedef struct
112	{
113	struct ev_watcher *w;
114	int events;
115	} ANPENDING;
116
117	static ANPENDING *pendings;
118	static int pendingmax, pendingcnt;
119
120	static void	224	static void
121	event (struct ev_watcher *w, int events)	225	event (EV_P_ W w, int events)
122	{	226	{
		227	if (w->pending)
		228	{
		229	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		230	return;
		231	}
		232
123	w->pending = ++pendingcnt;	233	w->pending = ++pendingcnt [ABSPRI (w)];
124	array_needsize (pendings, pendingmax, pendingcnt, );	234	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
125	pendings [pendingcnt - 1].w = w;	235	pendings [ABSPRI (w)][w->pending - 1].w = w;
126	pendings [pendingcnt - 1].events = events;	236	pendings [ABSPRI (w)][w->pending - 1].events = events;
127	}	237	}
128		238
129	static void	239	static void
		240	queue_events (EV_P_ W *events, int eventcnt, int type)
		241	{
		242	int i;
		243
		244	for (i = 0; i < eventcnt; ++i)
		245	event (EV_A_ events [i], type);
		246	}
		247
		248	static void
130	fd_event (int fd, int events)	249	fd_event (EV_P_ int fd, int events)
131	{	250	{
132	ANFD *anfd = anfds + fd;	251	ANFD *anfd = anfds + fd;
133	struct ev_io *w;	252	struct ev_io *w;
134		253
135	for (w = anfd->head; w; w = w->next)	254	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
136	{	255	{
137	int ev = w->events & events;	256	int ev = w->events & events;
138		257
139	if (ev)	258	if (ev)
140	event ((struct ev_watcher *)w, ev);	259	event (EV_A_ (W)w, ev);
141	}	260	}
142	}	261	}
143		262
		263	/*****************************************************************************/
		264
144	static void	265	static void
145	queue_events (struct ev_watcher **events, int eventcnt, int type)	266	fd_reify (EV_P)
146	{	267	{
147	int i;	268	int i;
148		269
149	for (i = 0; i < eventcnt; ++i)	270	for (i = 0; i < fdchangecnt; ++i)
150	event (events [i], type);	271	{
		272	int fd = fdchanges [i];
		273	ANFD *anfd = anfds + fd;
		274	struct ev_io *w;
		275
		276	int events = 0;
		277
		278	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		279	events |= w->events;
		280
		281	anfd->reify = 0;
		282
		283	if (anfd->events != events)
		284	{
		285	method_modify (EV_A_ fd, anfd->events, events);
		286	anfd->events = events;
		287	}
		288	}
		289
		290	fdchangecnt = 0;
		291	}
		292
		293	static void
		294	fd_change (EV_P_ int fd)
		295	{
		296	if (anfds [fd].reify || fdchangecnt < 0)
		297	return;
		298
		299	anfds [fd].reify = 1;
		300
		301	++fdchangecnt;
		302	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		303	fdchanges [fdchangecnt - 1] = fd;
		304	}
		305
		306	static void
		307	fd_kill (EV_P_ int fd)
		308	{
		309	struct ev_io *w;
		310
		311	while ((w = (struct ev_io *)anfds [fd].head))
		312	{
		313	ev_io_stop (EV_A_ w);
		314	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		315	}
		316	}
		317
		318	/* called on EBADF to verify fds */
		319	static void
		320	fd_ebadf (EV_P)
		321	{
		322	int fd;
		323
		324	for (fd = 0; fd < anfdmax; ++fd)
		325	if (anfds [fd].events)
		326	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		327	fd_kill (EV_A_ fd);
		328	}
		329
		330	/* called on ENOMEM in select/poll to kill some fds and retry */
		331	static void
		332	fd_enomem (EV_P)
		333	{
		334	int fd = anfdmax;
		335
		336	while (fd--)
		337	if (anfds [fd].events)
		338	{
		339	close (fd);
		340	fd_kill (EV_A_ fd);
		341	return;
		342	}
		343	}
		344
		345	/* susually called after fork if method needs to re-arm all fds from scratch */
		346	static void
		347	fd_rearm_all (EV_P)
		348	{
		349	int fd;
		350
		351	/* this should be highly optimised to not do anything but set a flag */
		352	for (fd = 0; fd < anfdmax; ++fd)
		353	if (anfds [fd].events)
		354	{
		355	anfds [fd].events = 0;
		356	fd_change (fd);
		357	}
151	}	358	}
152		359
153	/*****************************************************************************/	360	/*****************************************************************************/
154		361
155	static struct ev_timer **atimers;
156	static int atimermax, atimercnt;
157
158	static struct ev_timer **rtimers;
159	static int rtimermax, rtimercnt;
160
161	static void	362	static void
162	upheap (struct ev_timer **timers, int k)	363	upheap (WT *heap, int k)
163	{	364	{
164	struct ev_timer *w = timers [k];	365	WT w = heap [k];
165		366
166	while (k && timers [k >> 1]->at > w->at)	367	while (k && heap [k >> 1]->at > w->at)
167	{	368	{
168	timers [k] = timers [k >> 1];	369	heap [k] = heap [k >> 1];
169	timers [k]->active = k + 1;	370	heap [k]->active = k + 1;
170	k >>= 1;	371	k >>= 1;
171	}	372	}
172		373
173	timers [k] = w;	374	heap [k] = w;
174	timers [k]->active = k + 1;	375	heap [k]->active = k + 1;
175		376
176	}	377	}
177		378
178	static void	379	static void
179	downheap (struct ev_timer **timers, int N, int k)	380	downheap (WT *heap, int N, int k)
180	{	381	{
181	struct ev_timer *w = timers [k];	382	WT w = heap [k];
182		383
183	while (k < (N >> 1))	384	while (k < (N >> 1))
184	{	385	{
185	int j = k << 1;	386	int j = k << 1;
186		387
187	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	388	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
188	++j;	389	++j;
189		390
190	if (w->at <= timers [j]->at)	391	if (w->at <= heap [j]->at)
191	break;	392	break;
192		393
193	timers [k] = timers [j];	394	heap [k] = heap [j];
194	timers [k]->active = k + 1;	395	heap [k]->active = k + 1;
195	k = j;	396	k = j;
196	}	397	}
197		398
198	timers [k] = w;	399	heap [k] = w;
199	timers [k]->active = k + 1;	400	heap [k]->active = k + 1;
200	}	401	}
201		402
202	/*****************************************************************************/	403	/*****************************************************************************/
203		404
204	typedef struct	405	typedef struct
205	{	406	{
206	struct ev_signal *head;	407	struct ev_watcher_list *head;
207	sig_atomic_t gotsig;	408	sig_atomic_t volatile gotsig;
208	} ANSIG;	409	} ANSIG;
209		410
210	static ANSIG *signals;	411	static ANSIG *signals;
211	static int signalmax;	412	static int signalmax;
212		413
213	static int sigpipe [2];	414	static int sigpipe [2];
214	static sig_atomic_t gotsig;	415	static sig_atomic_t volatile gotsig;
215	static struct ev_io sigev;
216		416
217	static void	417	static void
218	signals_init (ANSIG *base, int count)	418	signals_init (ANSIG *base, int count)
219	{	419	{
220	while (count--)	420	while (count--)
221	{	421	{
222	base->head = 0;	422	base->head = 0;
223	base->gotsig = 0;	423	base->gotsig = 0;
		424
224	++base;	425	++base;
225	}	426	}
226	}	427	}
227		428
228	static void	429	static void
…		…
230	{	431	{
231	signals [signum - 1].gotsig = 1;	432	signals [signum - 1].gotsig = 1;
232		433
233	if (!gotsig)	434	if (!gotsig)
234	{	435	{
		436	int old_errno = errno;
235	gotsig = 1;	437	gotsig = 1;
236	write (sigpipe [1], &gotsig, 1);	438	write (sigpipe [1], &signum, 1);
		439	errno = old_errno;
237	}	440	}
238	}	441	}
239		442
240	static void	443	static void
241	sigcb (struct ev_io *iow, int revents)	444	sigcb (EV_P_ struct ev_io *iow, int revents)
242	{	445	{
243	struct ev_signal *w;	446	struct ev_watcher_list *w;
244	int sig;	447	int signum;
245		448
		449	read (sigpipe [0], &revents, 1);
246	gotsig = 0;	450	gotsig = 0;
247	read (sigpipe [0], &revents, 1);
248		451
249	for (sig = signalmax; sig--; )	452	for (signum = signalmax; signum--; )
250	if (signals [sig].gotsig)	453	if (signals [signum].gotsig)
251	{	454	{
252	signals [sig].gotsig = 0;	455	signals [signum].gotsig = 0;
253		456
254	for (w = signals [sig].head; w; w = w->next)	457	for (w = signals [signum].head; w; w = w->next)
255	event ((struct ev_watcher *)w, EV_SIGNAL);	458	event (EV_A_ (W)w, EV_SIGNAL);
256	}	459	}
257	}	460	}
258		461
259	static void	462	static void
260	siginit (void)	463	siginit (EV_P)
261	{	464	{
		465	#ifndef WIN32
262	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	466	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
263	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	467	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
264		468
265	/* rather than sort out wether we really need nb, set it */	469	/* rather than sort out wether we really need nb, set it */
266	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	470	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
267	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	471	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		472	#endif
268		473
269	evio_set (&sigev, sigpipe [0], EV_READ);	474	ev_io_set (&sigev, sigpipe [0], EV_READ);
270	evio_start (&sigev);	475	ev_io_start (EV_A_ &sigev);
		476	ev_unref (EV_A); /* child watcher should not keep loop alive */
271	}	477	}
272		478
273	/*****************************************************************************/	479	/*****************************************************************************/
274		480
275	static struct ev_idle **idles;	481	#ifndef WIN32
276	static int idlemax, idlecnt;
277		482
278	static struct ev_check **checks;	483	#ifndef WCONTINUED
279	static int checkmax, checkcnt;	484	# define WCONTINUED 0
		485	#endif
		486
		487	static void
		488	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		489	{
		490	struct ev_child *w;
		491
		492	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		493	if (w->pid == pid || !w->pid)
		494	{
		495	w->priority = sw->priority; /* need to do it *now* */
		496	w->rpid = pid;
		497	w->rstatus = status;
		498	event (EV_A_ (W)w, EV_CHILD);
		499	}
		500	}
		501
		502	static void
		503	childcb (EV_P_ struct ev_signal *sw, int revents)
		504	{
		505	int pid, status;
		506
		507	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		508	{
		509	/* make sure we are called again until all childs have been reaped */
		510	event (EV_A_ (W)sw, EV_SIGNAL);
		511
		512	child_reap (EV_A_ sw, pid, pid, status);
		513	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		514	}
		515	}
		516
		517	#endif
280		518
281	/*****************************************************************************/	519	/*****************************************************************************/
282		520
		521	#if EV_USE_KQUEUE
		522	# include "ev_kqueue.c"
		523	#endif
283	#if HAVE_EPOLL	524	#if EV_USE_EPOLL
284	# include "ev_epoll.c"	525	# include "ev_epoll.c"
285	#endif	526	#endif
		527	#if EV_USEV_POLL
		528	# include "ev_poll.c"
		529	#endif
286	#if HAVE_SELECT	530	#if EV_USE_SELECT
287	# include "ev_select.c"	531	# include "ev_select.c"
288	#endif	532	#endif
289		533
290	int ev_init (int flags)	534	int
		535	ev_version_major (void)
291	{	536	{
		537	return EV_VERSION_MAJOR;
		538	}
		539
		540	int
		541	ev_version_minor (void)
		542	{
		543	return EV_VERSION_MINOR;
		544	}
		545
		546	/* return true if we are running with elevated privileges and should ignore env variables */
		547	static int
		548	enable_secure (void)
		549	{
		550	#ifdef WIN32
		551	return 0;
		552	#else
		553	return getuid () != geteuid ()
		554	|| getgid () != getegid ();
		555	#endif
		556	}
		557
		558	int
		559	ev_method (EV_P)
		560	{
		561	return method;
		562	}
		563
		564	static void
		565	loop_init (EV_P_ int methods)
		566	{
		567	if (!method)
		568	{
292	#if HAVE_MONOTONIC	569	#if EV_USE_MONOTONIC
293	{	570	{
294	struct timespec ts;	571	struct timespec ts;
295	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	572	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
296	have_monotonic = 1;	573	have_monotonic = 1;
297	}	574	}
298	#endif	575	#endif
299		576
300	ev_now = ev_time ();	577	rt_now = ev_time ();
301	now = get_clock ();	578	mn_now = get_clock ();
302	diff = ev_now - now;	579	now_floor = mn_now;
		580	rtmn_diff = rt_now - mn_now;
303		581
		582	if (methods == EVMETHOD_AUTO)
		583	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		584	methods = atoi (getenv ("LIBEV_METHODS"));
		585	else
		586	methods = EVMETHOD_ANY;
		587
		588	method = 0;
		589	#if EV_USE_KQUEUE
		590	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		591	#endif
		592	#if EV_USE_EPOLL
		593	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		594	#endif
		595	#if EV_USEV_POLL
		596	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		597	#endif
		598	#if EV_USE_SELECT
		599	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		600	#endif
		601	}
		602	}
		603
		604	void
		605	loop_destroy (EV_P)
		606	{
		607	#if EV_USE_KQUEUE
		608	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		609	#endif
		610	#if EV_USE_EPOLL
		611	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		612	#endif
		613	#if EV_USEV_POLL
		614	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		615	#endif
		616	#if EV_USE_SELECT
		617	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		618	#endif
		619
		620	method = 0;
		621	/*TODO*/
		622	}
		623
		624	void
		625	loop_fork (EV_P)
		626	{
		627	/*TODO*/
		628	#if EV_USE_EPOLL
		629	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		630	#endif
		631	#if EV_USE_KQUEUE
		632	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		633	#endif
		634	}
		635
		636	#if EV_MULTIPLICITY
		637	struct ev_loop *
		638	ev_loop_new (int methods)
		639	{
		640	struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop));
		641
		642	loop_init (EV_A_ methods);
		643
		644	if (ev_methods (EV_A))
		645	return loop;
		646
		647	return 0;
		648	}
		649
		650	void
		651	ev_loop_destroy (EV_P)
		652	{
		653	loop_destroy (EV_A);
		654	free (loop);
		655	}
		656
		657	void
		658	ev_loop_fork (EV_P)
		659	{
		660	loop_fork (EV_A);
		661	}
		662
		663	#endif
		664
		665	#if EV_MULTIPLICITY
		666	struct ev_loop default_loop_struct;
		667	static struct ev_loop *default_loop;
		668
		669	struct ev_loop *
		670	#else
		671	static int default_loop;
		672
		673	int
		674	#endif
		675	ev_default_loop (int methods)
		676	{
		677	if (sigpipe [0] == sigpipe [1])
304	if (pipe (sigpipe))	678	if (pipe (sigpipe))
305	return 0;	679	return 0;
306		680
307	ev_method = EVMETHOD_NONE;	681	if (!default_loop)
308	#if HAVE_EPOLL
309	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
310	#endif
311	#if HAVE_SELECT
312	if (ev_method == EVMETHOD_NONE) select_init (flags);
313	#endif
314
315	if (ev_method)
316	{	682	{
		683	#if EV_MULTIPLICITY
		684	struct ev_loop *loop = default_loop = &default_loop_struct;
		685	#else
		686	default_loop = 1;
		687	#endif
		688
		689	loop_init (EV_A_ methods);
		690
		691	if (ev_method (EV_A))
		692	{
317	evw_init (&sigev, sigcb, 0);	693	ev_watcher_init (&sigev, sigcb);
		694	ev_set_priority (&sigev, EV_MAXPRI);
318	siginit ();	695	siginit (EV_A);
319	}
320		696
321	return ev_method;	697	#ifndef WIN32
322	}	698	ev_signal_init (&childev, childcb, SIGCHLD);
323		699	ev_set_priority (&childev, EV_MAXPRI);
324	/*****************************************************************************/	700	ev_signal_start (EV_A_ &childev);
325		701	ev_unref (EV_A); /* child watcher should not keep loop alive */
326	void ev_prefork (void)
327	{
328	}
329
330	void ev_postfork_parent (void)
331	{
332	}
333
334	void ev_postfork_child (void)
335	{
336	#if HAVE_EPOLL
337	if (ev_method == EVMETHOD_EPOLL)
338	epoll_postfork_child ();
339	#endif	702	#endif
		703	}
		704	else
		705	default_loop = 0;
		706	}
340		707
		708	return default_loop;
		709	}
		710
		711	void
		712	ev_default_destroy (void)
		713	{
		714	#if EV_MULTIPLICITY
		715	struct ev_loop *loop = default_loop;
		716	#endif
		717
		718	ev_ref (EV_A); /* child watcher */
		719	ev_signal_stop (EV_A_ &childev);
		720
		721	ev_ref (EV_A); /* signal watcher */
341	evio_stop (&sigev);	722	ev_io_stop (EV_A_ &sigev);
		723
		724	close (sigpipe [0]); sigpipe [0] = 0;
		725	close (sigpipe [1]); sigpipe [1] = 0;
		726
		727	loop_destroy (EV_A);
		728	}
		729
		730	void
		731	ev_default_fork (EV_P)
		732	{
		733	loop_fork (EV_A);
		734
		735	ev_io_stop (EV_A_ &sigev);
342	close (sigpipe [0]);	736	close (sigpipe [0]);
343	close (sigpipe [1]);	737	close (sigpipe [1]);
344	pipe (sigpipe);	738	pipe (sigpipe);
		739
		740	ev_ref (EV_A); /* signal watcher */
345	siginit ();	741	siginit (EV_A);
346	}	742	}
347		743
348	/*****************************************************************************/	744	/*****************************************************************************/
349		745
350	static void	746	static void
351	fd_reify (void)	747	call_pending (EV_P)
352	{	748	{
353	int i;	749	int pri;
354		750
355	for (i = 0; i < fdchangecnt; ++i)	751	for (pri = NUMPRI; pri--; )
356	{	752	while (pendingcnt [pri])
357	int fd = fdchanges [i];
358	ANFD *anfd = anfds + fd;
359	struct ev_io *w;
360
361	int wev = 0;
362
363	for (w = anfd->head; w; w = w->next)
364	wev |= w->events;
365
366	if (anfd->wev != wev)
367	{	753	{
368	method_modify (fd, anfd->wev, wev);	754	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
369	anfd->wev = wev;
370	}
371	}
372		755
373	fdchangecnt = 0;
374	}
375
376	static void
377	call_pending ()
378	{
379	int i;
380
381	for (i = 0; i < pendingcnt; ++i)
382	{
383	ANPENDING *p = pendings + i;
384
385	if (p->w)	756	if (p->w)
386	{	757	{
387	p->w->pending = 0;	758	p->w->pending = 0;
388	p->w->cb (p->w, p->events);	759	p->w->cb (EV_A_ p->w, p->events);
389	}	760	}
390	}	761	}
391
392	pendingcnt = 0;
393	}	762	}
394		763
395	static void	764	static void
396	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	765	timers_reify (EV_P)
397	{	766	{
398	while (timercnt && timers [0]->at <= now)	767	while (timercnt && timers [0]->at <= mn_now)
399	{	768	{
400	struct ev_timer *w = timers [0];	769	struct ev_timer *w = timers [0];
401		770
402	/* first reschedule or stop timer */	771	/* first reschedule or stop timer */
403	if (w->repeat)	772	if (w->repeat)
404	{	773	{
405	if (w->is_abs)	774	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
406	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
407	else
408	w->at = now + w->repeat;	775	w->at = mn_now + w->repeat;
409
410	assert (w->at > now);
411
412	downheap (timers, timercnt, 0);	776	downheap ((WT *)timers, timercnt, 0);
413	}	777	}
414	else	778	else
		779	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		780
		781	event (EV_A_ (W)w, EV_TIMEOUT);
		782	}
		783	}
		784
		785	static void
		786	periodics_reify (EV_P)
		787	{
		788	while (periodiccnt && periodics [0]->at <= rt_now)
		789	{
		790	struct ev_periodic *w = periodics [0];
		791
		792	/* first reschedule or stop timer */
		793	if (w->interval)
415	{	794	{
416	evtimer_stop (w); /* nonrepeating: stop timer */	795	w->at += floor ((rt_now - w->at) / w->interval + 1.) * w->interval;
417	--timercnt; /* maybe pass by reference instead? */	796	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > rt_now));
		797	downheap ((WT *)periodics, periodiccnt, 0);
418	}	798	}
		799	else
		800	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
419		801
420	event ((struct ev_watcher *)w, EV_TIMEOUT);	802	event (EV_A_ (W)w, EV_PERIODIC);
421	}	803	}
422	}	804	}
423		805
424	static void	806	static void
425	time_update ()	807	periodics_reschedule (EV_P)
426	{	808	{
427	int i;	809	int i;
428	ev_now = ev_time ();
429		810
430	if (have_monotonic)	811	/* adjust periodics after time jump */
		812	for (i = 0; i < periodiccnt; ++i)
431	{	813	{
432	ev_tstamp odiff = diff;	814	struct ev_periodic *w = periodics [i];
433		815
434	/* detecting time jumps is much more difficult */	816	if (w->interval)
435	for (i = 2; --i; ) /* loop a few times, before making important decisions */
436	{	817	{
437	now = get_clock ();	818	ev_tstamp diff = ceil ((rt_now - w->at) / w->interval) * w->interval;
438	diff = ev_now - now;
439		819
440	if (fabs (odiff - diff) < MIN_TIMEJUMP)	820	if (fabs (diff) >= 1e-4)
441	return; /* all is well */	821	{
		822	ev_periodic_stop (EV_A_ w);
		823	ev_periodic_start (EV_A_ w);
442		824
443	ev_now = ev_time ();	825	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		826	}
444	}	827	}
		828	}
		829	}
445		830
446	/* time jump detected, reschedule atimers */	831	inline int
447	for (i = 0; i < atimercnt; ++i)	832	time_update_monotonic (EV_P)
		833	{
		834	mn_now = get_clock ();
		835
		836	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		837	{
		838	rt_now = rtmn_diff + mn_now;
		839	return 0;
		840	}
		841	else
		842	{
		843	now_floor = mn_now;
		844	rt_now = ev_time ();
		845	return 1;
		846	}
		847	}
		848
		849	static void
		850	time_update (EV_P)
		851	{
		852	int i;
		853
		854	#if EV_USE_MONOTONIC
		855	if (expect_true (have_monotonic))
		856	{
		857	if (time_update_monotonic (EV_A))
448	{	858	{
449	struct ev_timer *w = atimers [i];	859	ev_tstamp odiff = rtmn_diff;
450	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	860
		861	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		862	{
		863	rtmn_diff = rt_now - mn_now;
		864
		865	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		866	return; /* all is well */
		867
		868	rt_now = ev_time ();
		869	mn_now = get_clock ();
		870	now_floor = mn_now;
		871	}
		872
		873	periodics_reschedule (EV_A);
		874	/* no timer adjustment, as the monotonic clock doesn't jump */
		875	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
451	}	876	}
452	}	877	}
453	else	878	else
		879	#endif
454	{	880	{
455	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	881	rt_now = ev_time ();
456	/* time jump detected, adjust rtimers */	882
		883	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		884	{
		885	periodics_reschedule (EV_A);
		886
		887	/* adjust timers. this is easy, as the offset is the same for all */
457	for (i = 0; i < rtimercnt; ++i)	888	for (i = 0; i < timercnt; ++i)
458	rtimers [i]->at += ev_now - now;	889	timers [i]->at += rt_now - mn_now;
		890	}
459		891
460	now = ev_now;	892	mn_now = rt_now;
461	}	893	}
462	}	894	}
463		895
464	int ev_loop_done;	896	void
		897	ev_ref (EV_P)
		898	{
		899	++activecnt;
		900	}
465		901
		902	void
		903	ev_unref (EV_P)
		904	{
		905	--activecnt;
		906	}
		907
		908	static int loop_done;
		909
		910	void
466	void ev_loop (int flags)	911	ev_loop (EV_P_ int flags)
467	{	912	{
468	double block;	913	double block;
469	ev_loop_done = flags & EVLOOP_ONESHOT;	914	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
470
471	if (checkcnt)
472	{
473	queue_events (checks, checkcnt, EV_CHECK);
474	call_pending ();
475	}
476		915
477	do	916	do
478	{	917	{
		918	/* queue check watchers (and execute them) */
		919	if (expect_false (preparecnt))
		920	{
		921	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		922	call_pending (EV_A);
		923	}
		924
479	/* update fd-related kernel structures */	925	/* update fd-related kernel structures */
480	fd_reify ();	926	fd_reify (EV_A);
481		927
482	/* calculate blocking time */	928	/* calculate blocking time */
		929
		930	/* we only need this for !monotonic clockor timers, but as we basically
		931	always have timers, we just calculate it always */
		932	#if EV_USE_MONOTONIC
		933	if (expect_true (have_monotonic))
		934	time_update_monotonic (EV_A);
		935	else
		936	#endif
		937	{
		938	rt_now = ev_time ();
		939	mn_now = rt_now;
		940	}
		941
483	if (flags & EVLOOP_NONBLOCK || idlecnt)	942	if (flags & EVLOOP_NONBLOCK || idlecnt)
484	block = 0.;	943	block = 0.;
485	else	944	else
486	{	945	{
487	block = MAX_BLOCKTIME;	946	block = MAX_BLOCKTIME;
488		947
489	if (rtimercnt)	948	if (timercnt)
490	{	949	{
491	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	950	ev_tstamp to = timers [0]->at - mn_now + method_fudge;
492	if (block > to) block = to;	951	if (block > to) block = to;
493	}	952	}
494		953
495	if (atimercnt)	954	if (periodiccnt)
496	{	955	{
497	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	956	ev_tstamp to = periodics [0]->at - rt_now + method_fudge;
498	if (block > to) block = to;	957	if (block > to) block = to;
499	}	958	}
500		959
501	if (block < 0.) block = 0.;	960	if (block < 0.) block = 0.;
502	}	961	}
503		962
504	method_poll (block);	963	method_poll (EV_A_ block);
505		964
506	/* update ev_now, do magic */	965	/* update rt_now, do magic */
507	time_update ();	966	time_update (EV_A);
508		967
509	/* queue pending timers and reschedule them */	968	/* queue pending timers and reschedule them */
510	/* absolute timers first */	969	timers_reify (EV_A); /* relative timers called last */
511	timers_reify (atimers, atimercnt, ev_now);	970	periodics_reify (EV_A); /* absolute timers called first */
512	/* relative timers second */
513	timers_reify (rtimers, rtimercnt, now);
514		971
515	/* queue idle watchers unless io or timers are pending */	972	/* queue idle watchers unless io or timers are pending */
516	if (!pendingcnt)	973	if (!pendingcnt)
517	queue_events (idles, idlecnt, EV_IDLE);	974	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
518		975
519	/* queue check and possibly idle watchers */	976	/* queue check watchers, to be executed first */
		977	if (checkcnt)
520	queue_events (checks, checkcnt, EV_CHECK);	978	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
521		979
522	call_pending ();	980	call_pending (EV_A);
523	}	981	}
524	while (!ev_loop_done);	982	while (activecnt && !loop_done);
		983
		984	if (loop_done != 2)
		985	loop_done = 0;
		986	}
		987
		988	void
		989	ev_unloop (EV_P_ int how)
		990	{
		991	loop_done = how;
525	}	992	}
526		993
527	/*****************************************************************************/	994	/*****************************************************************************/
528		995
529	static void	996	inline void
530	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	997	wlist_add (WL *head, WL elem)
531	{	998	{
532	elem->next = *head;	999	elem->next = *head;
533	*head = elem;	1000	*head = elem;
534	}	1001	}
535		1002
536	static void	1003	inline void
537	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1004	wlist_del (WL *head, WL elem)
538	{	1005	{
539	while (*head)	1006	while (*head)
540	{	1007	{
541	if (*head == elem)	1008	if (*head == elem)
542	{	1009	{
…		…
546		1013
547	head = &(*head)->next;	1014	head = &(*head)->next;
548	}	1015	}
549	}	1016	}
550		1017
551	static void	1018	inline void
552	ev_start (struct ev_watcher *w, int active)	1019	ev_clear_pending (EV_P_ W w)
553	{	1020	{
		1021	if (w->pending)
		1022	{
		1023	pendings [ABSPRI (w)][w->pending - 1].w = 0;
554	w->pending = 0;	1024	w->pending = 0;
		1025	}
		1026	}
		1027
		1028	inline void
		1029	ev_start (EV_P_ W w, int active)
		1030	{
		1031	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1032	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1033
555	w->active = active;	1034	w->active = active;
		1035	ev_ref (EV_A);
556	}	1036	}
557		1037
558	static void	1038	inline void
559	ev_stop (struct ev_watcher *w)	1039	ev_stop (EV_P_ W w)
560	{	1040	{
561	if (w->pending)	1041	ev_unref (EV_A);
562	pendings [w->pending - 1].w = 0;
563
564	w->active = 0;	1042	w->active = 0;
565	/* nop */
566	}	1043	}
567		1044
568	/*****************************************************************************/	1045	/*****************************************************************************/
569		1046
570	void	1047	void
571	evio_start (struct ev_io *w)	1048	ev_io_start (EV_P_ struct ev_io *w)
572	{	1049	{
		1050	int fd = w->fd;
		1051
573	if (ev_is_active (w))	1052	if (ev_is_active (w))
574	return;	1053	return;
575		1054
576	int fd = w->fd;	1055	assert (("ev_io_start called with negative fd", fd >= 0));
577		1056
578	ev_start ((struct ev_watcher *)w, 1);	1057	ev_start (EV_A_ (W)w, 1);
579	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1058	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
580	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1059	wlist_add ((WL *)&anfds[fd].head, (WL)w);
581		1060
582	++fdchangecnt;	1061	fd_change (EV_A_ fd);
583	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
584	fdchanges [fdchangecnt - 1] = fd;
585	}	1062	}
586		1063
587	void	1064	void
588	evio_stop (struct ev_io *w)	1065	ev_io_stop (EV_P_ struct ev_io *w)
589	{	1066	{
		1067	ev_clear_pending (EV_A_ (W)w);
590	if (!ev_is_active (w))	1068	if (!ev_is_active (w))
591	return;	1069	return;
592		1070
593	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1071	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
594	ev_stop ((struct ev_watcher *)w);	1072	ev_stop (EV_A_ (W)w);
595		1073
596	++fdchangecnt;	1074	fd_change (EV_A_ w->fd);
597	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598	fdchanges [fdchangecnt - 1] = w->fd;
599	}	1075	}
600		1076
601	void	1077	void
602	evtimer_start (struct ev_timer *w)	1078	ev_timer_start (EV_P_ struct ev_timer *w)
603	{	1079	{
604	if (ev_is_active (w))	1080	if (ev_is_active (w))
605	return;	1081	return;
606		1082
607	if (w->is_abs)	1083	w->at += mn_now;
		1084
		1085	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1086
		1087	ev_start (EV_A_ (W)w, ++timercnt);
		1088	array_needsize (timers, timermax, timercnt, );
		1089	timers [timercnt - 1] = w;
		1090	upheap ((WT *)timers, timercnt - 1);
		1091	}
		1092
		1093	void
		1094	ev_timer_stop (EV_P_ struct ev_timer *w)
		1095	{
		1096	ev_clear_pending (EV_A_ (W)w);
		1097	if (!ev_is_active (w))
		1098	return;
		1099
		1100	if (w->active < timercnt--)
		1101	{
		1102	timers [w->active - 1] = timers [timercnt];
		1103	downheap ((WT *)timers, timercnt, w->active - 1);
608	{	1104	}
609	/* this formula differs from the one in timer_reify becuse we do not round up */	1105
		1106	w->at = w->repeat;
		1107
		1108	ev_stop (EV_A_ (W)w);
		1109	}
		1110
		1111	void
		1112	ev_timer_again (EV_P_ struct ev_timer *w)
		1113	{
		1114	if (ev_is_active (w))
		1115	{
610	if (w->repeat)	1116	if (w->repeat)
611	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1117	{
612		1118	w->at = mn_now + w->repeat;
613	ev_start ((struct ev_watcher *)w, ++atimercnt);	1119	downheap ((WT *)timers, timercnt, w->active - 1);
614	array_needsize (atimers, atimermax, atimercnt, );	1120	}
615	atimers [atimercnt - 1] = w;
616	upheap (atimers, atimercnt - 1);
617	}
618	else	1121	else
		1122	ev_timer_stop (EV_A_ w);
619	{	1123	}
620	w->at += now;	1124	else if (w->repeat)
621		1125	ev_timer_start (EV_A_ w);
622	ev_start ((struct ev_watcher *)w, ++rtimercnt);
623	array_needsize (rtimers, rtimermax, rtimercnt, );
624	rtimers [rtimercnt - 1] = w;
625	upheap (rtimers, rtimercnt - 1);
626	}
627
628	}	1126	}
629		1127
630	void	1128	void
631	evtimer_stop (struct ev_timer *w)	1129	ev_periodic_start (EV_P_ struct ev_periodic *w)
632	{	1130	{
		1131	if (ev_is_active (w))
		1132	return;
		1133
		1134	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1135
		1136	/* this formula differs from the one in periodic_reify because we do not always round up */
		1137	if (w->interval)
		1138	w->at += ceil ((rt_now - w->at) / w->interval) * w->interval;
		1139
		1140	ev_start (EV_A_ (W)w, ++periodiccnt);
		1141	array_needsize (periodics, periodicmax, periodiccnt, );
		1142	periodics [periodiccnt - 1] = w;
		1143	upheap ((WT *)periodics, periodiccnt - 1);
		1144	}
		1145
		1146	void
		1147	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1148	{
		1149	ev_clear_pending (EV_A_ (W)w);
633	if (!ev_is_active (w))	1150	if (!ev_is_active (w))
634	return;	1151	return;
635		1152
636	if (w->is_abs)
637	{
638	if (w->active < atimercnt--)	1153	if (w->active < periodiccnt--)
639	{
640	atimers [w->active - 1] = atimers [atimercnt];
641	downheap (atimers, atimercnt, w->active - 1);
642	}
643	}	1154	{
644	else	1155	periodics [w->active - 1] = periodics [periodiccnt];
		1156	downheap ((WT *)periodics, periodiccnt, w->active - 1);
645	{	1157	}
646	if (w->active < rtimercnt--)
647	{
648	rtimers [w->active - 1] = rtimers [rtimercnt];
649	downheap (rtimers, rtimercnt, w->active - 1);
650	}
651	}
652		1158
653	ev_stop ((struct ev_watcher *)w);	1159	ev_stop (EV_A_ (W)w);
654	}	1160	}
655		1161
656	void	1162	void
657	evsignal_start (struct ev_signal *w)	1163	ev_idle_start (EV_P_ struct ev_idle *w)
658	{	1164	{
659	if (ev_is_active (w))	1165	if (ev_is_active (w))
660	return;	1166	return;
661		1167
662	ev_start ((struct ev_watcher *)w, 1);	1168	ev_start (EV_A_ (W)w, ++idlecnt);
		1169	array_needsize (idles, idlemax, idlecnt, );
		1170	idles [idlecnt - 1] = w;
		1171	}
		1172
		1173	void
		1174	ev_idle_stop (EV_P_ struct ev_idle *w)
		1175	{
		1176	ev_clear_pending (EV_A_ (W)w);
		1177	if (ev_is_active (w))
		1178	return;
		1179
		1180	idles [w->active - 1] = idles [--idlecnt];
		1181	ev_stop (EV_A_ (W)w);
		1182	}
		1183
		1184	void
		1185	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1186	{
		1187	if (ev_is_active (w))
		1188	return;
		1189
		1190	ev_start (EV_A_ (W)w, ++preparecnt);
		1191	array_needsize (prepares, preparemax, preparecnt, );
		1192	prepares [preparecnt - 1] = w;
		1193	}
		1194
		1195	void
		1196	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1197	{
		1198	ev_clear_pending (EV_A_ (W)w);
		1199	if (ev_is_active (w))
		1200	return;
		1201
		1202	prepares [w->active - 1] = prepares [--preparecnt];
		1203	ev_stop (EV_A_ (W)w);
		1204	}
		1205
		1206	void
		1207	ev_check_start (EV_P_ struct ev_check *w)
		1208	{
		1209	if (ev_is_active (w))
		1210	return;
		1211
		1212	ev_start (EV_A_ (W)w, ++checkcnt);
		1213	array_needsize (checks, checkmax, checkcnt, );
		1214	checks [checkcnt - 1] = w;
		1215	}
		1216
		1217	void
		1218	ev_check_stop (EV_P_ struct ev_check *w)
		1219	{
		1220	ev_clear_pending (EV_A_ (W)w);
		1221	if (ev_is_active (w))
		1222	return;
		1223
		1224	checks [w->active - 1] = checks [--checkcnt];
		1225	ev_stop (EV_A_ (W)w);
		1226	}
		1227
		1228	#ifndef SA_RESTART
		1229	# define SA_RESTART 0
		1230	#endif
		1231
		1232	void
		1233	ev_signal_start (EV_P_ struct ev_signal *w)
		1234	{
		1235	#if EV_MULTIPLICITY
		1236	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1237	#endif
		1238	if (ev_is_active (w))
		1239	return;
		1240
		1241	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1242
		1243	ev_start (EV_A_ (W)w, 1);
663	array_needsize (signals, signalmax, w->signum, signals_init);	1244	array_needsize (signals, signalmax, w->signum, signals_init);
664	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1245	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
665		1246
666	if (!w->next)	1247	if (!w->next)
667	{	1248	{
668	struct sigaction sa;	1249	struct sigaction sa;
669	sa.sa_handler = sighandler;	1250	sa.sa_handler = sighandler;
670	sigfillset (&sa.sa_mask);	1251	sigfillset (&sa.sa_mask);
671	sa.sa_flags = 0;	1252	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
672	sigaction (w->signum, &sa, 0);	1253	sigaction (w->signum, &sa, 0);
673	}	1254	}
674	}	1255	}
675		1256
676	void	1257	void
677	evsignal_stop (struct ev_signal *w)	1258	ev_signal_stop (EV_P_ struct ev_signal *w)
678	{	1259	{
		1260	ev_clear_pending (EV_A_ (W)w);
679	if (!ev_is_active (w))	1261	if (!ev_is_active (w))
680	return;	1262	return;
681		1263
682	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1264	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
683	ev_stop ((struct ev_watcher *)w);	1265	ev_stop (EV_A_ (W)w);
684		1266
685	if (!signals [w->signum - 1].head)	1267	if (!signals [w->signum - 1].head)
686	signal (w->signum, SIG_DFL);	1268	signal (w->signum, SIG_DFL);
687	}	1269	}
688		1270
689	void evidle_start (struct ev_idle *w)	1271	void
		1272	ev_child_start (EV_P_ struct ev_child *w)
690	{	1273	{
		1274	#if EV_MULTIPLICITY
		1275	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1276	#endif
691	if (ev_is_active (w))	1277	if (ev_is_active (w))
692	return;	1278	return;
693		1279
694	ev_start ((struct ev_watcher *)w, ++idlecnt);	1280	ev_start (EV_A_ (W)w, 1);
695	array_needsize (idles, idlemax, idlecnt, );	1281	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
696	idles [idlecnt - 1] = w;
697	}	1282	}
698		1283
699	void evidle_stop (struct ev_idle *w)	1284	void
		1285	ev_child_stop (EV_P_ struct ev_child *w)
700	{	1286	{
701	idles [w->active - 1] = idles [--idlecnt];	1287	ev_clear_pending (EV_A_ (W)w);
702	ev_stop ((struct ev_watcher *)w);
703	}
704
705	void evcheck_start (struct ev_check *w)
706	{
707	if (ev_is_active (w))	1288	if (ev_is_active (w))
708	return;	1289	return;
709		1290
710	ev_start ((struct ev_watcher *)w, ++checkcnt);	1291	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
711	array_needsize (checks, checkmax, checkcnt, );	1292	ev_stop (EV_A_ (W)w);
712	checks [checkcnt - 1] = w;
713	}
714
715	void evcheck_stop (struct ev_check *w)
716	{
717	checks [w->active - 1] = checks [--checkcnt];
718	ev_stop ((struct ev_watcher *)w);
719	}	1293	}
720		1294
721	/*****************************************************************************/	1295	/*****************************************************************************/
722	#if 1
723		1296
724	static void	1297	struct ev_once
725	sin_cb (struct ev_io *w, int revents)
726	{	1298	{
727	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
728	}
729
730	static void
731	ocb (struct ev_timer *w, int revents)
732	{
733	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
734	evtimer_stop (w);
735	evtimer_start (w);
736	}
737
738	static void
739	scb (struct ev_signal *w, int revents)
740	{
741	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
742	}
743
744	static void
745	gcb (struct ev_signal *w, int revents)
746	{
747	fprintf (stderr, "generic %x\n", revents);
748	}
749
750	int main (void)
751	{
752	struct ev_io sin;	1299	struct ev_io io;
753
754	ev_init (0);
755
756	evw_init (&sin, sin_cb, 55);
757	evio_set (&sin, 0, EV_READ);
758	evio_start (&sin);
759
760	struct ev_timer t[10000];
761
762	#if 0
763	int i;
764	for (i = 0; i < 10000; ++i)
765	{
766	struct ev_timer *w = t + i;
767	evw_init (w, ocb, i);
768	evtimer_set_abs (w, drand48 (), 0.99775533);
769	evtimer_start (w);
770	if (drand48 () < 0.5)
771	evtimer_stop (w);
772	}
773	#endif
774
775	struct ev_timer t1;	1300	struct ev_timer to;
776	evw_init (&t1, ocb, 0);	1301	void (*cb)(int revents, void *arg);
777	evtimer_set_abs (&t1, 5, 10);	1302	void *arg;
778	evtimer_start (&t1);	1303	};
779		1304
780	struct ev_signal sig;	1305	static void
781	evw_init (&sig, scb, 65535);	1306	once_cb (EV_P_ struct ev_once *once, int revents)
782	evsignal_set (&sig, SIGQUIT);	1307	{
783	evsignal_start (&sig);	1308	void (*cb)(int revents, void *arg) = once->cb;
		1309	void *arg = once->arg;
784		1310
785	struct ev_check cw;	1311	ev_io_stop (EV_A_ &once->io);
786	evw_init (&cw, gcb, 0);	1312	ev_timer_stop (EV_A_ &once->to);
787	evcheck_start (&cw);	1313	free (once);
788		1314
789	struct ev_idle iw;	1315	cb (revents, arg);
790	evw_init (&iw, gcb, 0);
791	evidle_start (&iw);
792
793	ev_loop (0);
794
795	return 0;
796	}	1316	}
797		1317
798	#endif	1318	static void
		1319	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1320	{
		1321	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1322	}
799		1323
		1324	static void
		1325	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1326	{
		1327	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1328	}
800		1329
		1330	void
		1331	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1332	{
		1333	struct ev_once *once = malloc (sizeof (struct ev_once));
801		1334
		1335	if (!once)
		1336	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1337	else
		1338	{
		1339	once->cb = cb;
		1340	once->arg = arg;
802		1341
		1342	ev_watcher_init (&once->io, once_cb_io);
		1343	if (fd >= 0)
		1344	{
		1345	ev_io_set (&once->io, fd, events);
		1346	ev_io_start (EV_A_ &once->io);
		1347	}
		1348
		1349	ev_watcher_init (&once->to, once_cb_to);
		1350	if (timeout >= 0.)
		1351	{
		1352	ev_timer_set (&once->to, timeout, 0.);
		1353	ev_timer_start (EV_A_ &once->to);
		1354	}
		1355	}
		1356	}
		1357

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