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Comparing libev/ev.c (file contents):
Revision 1.12 by root, Wed Oct 31 09:23:17 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
14	#define HAVE_EPOLL 1	53	/**/
15		54
16	#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
17	# ifdef CLOCK_MONOTONIC	81	#ifndef CLOCK_MONOTONIC
		82	# undef EV_USE_MONOTONIC
18	# define HAVE_MONOTONIC 1	83	# define EV_USE_MONOTONIC 0
19	# endif	84	#endif
20	#endif
21		85
22	#ifndef HAVE_SELECT
23	# define HAVE_SELECT 1
24	#endif
25
26	#ifndef HAVE_EPOLL
27	# define HAVE_EPOLL 0
28	#endif
29
30	#ifndef HAVE_REALTIME	86	#ifndef CLOCK_REALTIME
31	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	87	# undef EV_USE_REALTIME
		88	# define EV_USE_REALTIME 0
32	#endif	89	#endif
		90
		91	/**/
33		92
34	#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) */
35	#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 */
36		97
		98	#ifndef EV_EMBED
37	#include "ev.h"	99	# include "ev.h"
		100	#endif
38		101
39	struct ev_watcher {	102	#if __GNUC__ >= 3
40	EV_WATCHER (ev_watcher);	103	# define expect(expr,value) __builtin_expect ((expr),(value))
41	};	104	# define inline inline
		105	#else
		106	# define expect(expr,value) (expr)
		107	# define inline static
		108	#endif
42		109
43	struct ev_watcher_list {	110	#define expect_false(expr) expect ((expr) != 0, 0)
44	EV_WATCHER_LIST (ev_watcher_list);	111	#define expect_true(expr) expect ((expr) != 0, 1)
45	};
46		112
47	struct ev_watcher_time {	113	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
48	EV_WATCHER_TIME (ev_watcher_time);	114	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
49	};
50		115
51	typedef struct ev_watcher *W;	116	typedef struct ev_watcher *W;
52	typedef struct ev_watcher_list *WL;	117	typedef struct ev_watcher_list *WL;
53	typedef struct ev_watcher_time *WT;	118	typedef struct ev_watcher_time *WT;
54		119
55	static ev_tstamp now, diff; /* monotonic clock */	120	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
56	ev_tstamp ev_now;
57	int ev_method;
58
59	static int have_monotonic; /* runtime */
60
61	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
62	static void (*method_modify)(int fd, int oev, int nev);
63	static void (*method_poll)(ev_tstamp timeout);
64		121
65	/*****************************************************************************/	122	/*****************************************************************************/
66		123
67	ev_tstamp	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"
		143	};
		144	# undef VAR
		145	# include "ev_wrap.h"
		146
		147	#else
		148
		149	# define VAR(name,decl) static decl;
		150	# include "ev_vars.h"
		151	# undef VAR
		152
		153	#endif
		154
		155	/*****************************************************************************/
		156
		157	inline ev_tstamp
68	ev_time (void)	158	ev_time (void)
69	{	159	{
70	#if HAVE_REALTIME	160	#if EV_USE_REALTIME
71	struct timespec ts;	161	struct timespec ts;
72	clock_gettime (CLOCK_REALTIME, &ts);	162	clock_gettime (CLOCK_REALTIME, &ts);
73	return ts.tv_sec + ts.tv_nsec * 1e-9;	163	return ts.tv_sec + ts.tv_nsec * 1e-9;
74	#else	164	#else
75	struct timeval tv;	165	struct timeval tv;
76	gettimeofday (&tv, 0);	166	gettimeofday (&tv, 0);
77	return tv.tv_sec + tv.tv_usec * 1e-6;	167	return tv.tv_sec + tv.tv_usec * 1e-6;
78	#endif	168	#endif
79	}	169	}
80		170
81	static ev_tstamp	171	inline ev_tstamp
82	get_clock (void)	172	get_clock (void)
83	{	173	{
84	#if HAVE_MONOTONIC	174	#if EV_USE_MONOTONIC
85	if (have_monotonic)	175	if (expect_true (have_monotonic))
86	{	176	{
87	struct timespec ts;	177	struct timespec ts;
88	clock_gettime (CLOCK_MONOTONIC, &ts);	178	clock_gettime (CLOCK_MONOTONIC, &ts);
89	return ts.tv_sec + ts.tv_nsec * 1e-9;	179	return ts.tv_sec + ts.tv_nsec * 1e-9;
90	}	180	}
91	#endif	181	#endif
92		182
93	return ev_time ();	183	return ev_time ();
94	}	184	}
95		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
96	#define array_needsize(base,cur,cnt,init) \	194	#define array_needsize(base,cur,cnt,init) \
97	if ((cnt) > cur) \	195	if (expect_false ((cnt) > cur)) \
98	{ \	196	{ \
99	int newcnt = cur ? cur << 1 : 16; \	197	int newcnt = cur; \
100	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	\
101	base = realloc (base, sizeof (*base) * (newcnt)); \	204	base = realloc (base, sizeof (*base) * (newcnt)); \
102	init (base + cur, newcnt - cur); \	205	init (base + cur, newcnt - cur); \
103	cur = newcnt; \	206	cur = newcnt; \
104	}	207	}
105		208
106	/*****************************************************************************/	209	/*****************************************************************************/
107		210
108	typedef struct
109	{
110	struct ev_io *head;
111	unsigned char wev, rev; /* want, received event set */
112	} ANFD;
113
114	static ANFD *anfds;
115	static int anfdmax;
116
117	static int *fdchanges;
118	static int fdchangemax, fdchangecnt;
119
120	static void	211	static void
121	anfds_init (ANFD *base, int count)	212	anfds_init (ANFD *base, int count)
122	{	213	{
123	while (count--)	214	while (count--)
124	{	215	{
125	base->head = 0;	216	base->head = 0;
126	base->wev = base->rev = EV_NONE;	217	base->events = EV_NONE;
		218	base->reify = 0;
		219
127	++base;	220	++base;
128	}	221	}
129	}	222	}
130		223
131	typedef struct
132	{
133	W w;
134	int events;
135	} ANPENDING;
136
137	static ANPENDING *pendings;
138	static int pendingmax, pendingcnt;
139
140	static void	224	static void
141	event (W w, int events)	225	event (EV_P_ W w, int events)
142	{	226	{
		227	if (w->pending)
		228	{
		229	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		230	return;
		231	}
		232
143	w->pending = ++pendingcnt;	233	w->pending = ++pendingcnt [ABSPRI (w)];
144	array_needsize (pendings, pendingmax, pendingcnt, );	234	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
145	pendings [pendingcnt - 1].w = w;	235	pendings [ABSPRI (w)][w->pending - 1].w = w;
146	pendings [pendingcnt - 1].events = events;	236	pendings [ABSPRI (w)][w->pending - 1].events = events;
147	}	237	}
148		238
149	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
150	fd_event (int fd, int events)	249	fd_event (EV_P_ int fd, int events)
151	{	250	{
152	ANFD *anfd = anfds + fd;	251	ANFD *anfd = anfds + fd;
153	struct ev_io *w;	252	struct ev_io *w;
154		253
155	for (w = anfd->head; w; w = w->next)	254	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
156	{	255	{
157	int ev = w->events & events;	256	int ev = w->events & events;
158		257
159	if (ev)	258	if (ev)
160	event ((W)w, ev);	259	event (EV_A_ (W)w, ev);
161	}	260	}
162	}	261	}
163		262
		263	/*****************************************************************************/
		264
164	static void	265	static void
165	queue_events (W *events, int eventcnt, int type)	266	fd_reify (EV_P)
166	{	267	{
167	int i;	268	int i;
168		269
169	for (i = 0; i < eventcnt; ++i)	270	for (i = 0; i < fdchangecnt; ++i)
170	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	}
171	}	358	}
172		359
173	/*****************************************************************************/	360	/*****************************************************************************/
174		361
175	static struct ev_timer **timers;
176	static int timermax, timercnt;
177
178	static struct ev_periodic **periodics;
179	static int periodicmax, periodiccnt;
180
181	static void	362	static void
182	upheap (WT *timers, int k)	363	upheap (WT *heap, int k)
183	{	364	{
184	WT w = timers [k];	365	WT w = heap [k];
185		366
186	while (k && timers [k >> 1]->at > w->at)	367	while (k && heap [k >> 1]->at > w->at)
187	{	368	{
188	timers [k] = timers [k >> 1];	369	heap [k] = heap [k >> 1];
189	timers [k]->active = k + 1;	370	heap [k]->active = k + 1;
190	k >>= 1;	371	k >>= 1;
191	}	372	}
192		373
193	timers [k] = w;	374	heap [k] = w;
194	timers [k]->active = k + 1;	375	heap [k]->active = k + 1;
195		376
196	}	377	}
197		378
198	static void	379	static void
199	downheap (WT *timers, int N, int k)	380	downheap (WT *heap, int N, int k)
200	{	381	{
201	WT w = timers [k];	382	WT w = heap [k];
202		383
203	while (k < (N >> 1))	384	while (k < (N >> 1))
204	{	385	{
205	int j = k << 1;	386	int j = k << 1;
206		387
207	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	388	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
208	++j;	389	++j;
209		390
210	if (w->at <= timers [j]->at)	391	if (w->at <= heap [j]->at)
211	break;	392	break;
212		393
213	timers [k] = timers [j];	394	heap [k] = heap [j];
214	timers [k]->active = k + 1;	395	heap [k]->active = k + 1;
215	k = j;	396	k = j;
216	}	397	}
217		398
218	timers [k] = w;	399	heap [k] = w;
219	timers [k]->active = k + 1;	400	heap [k]->active = k + 1;
220	}	401	}
221		402
222	/*****************************************************************************/	403	/*****************************************************************************/
223		404
224	typedef struct	405	typedef struct
225	{	406	{
226	struct ev_signal *head;	407	struct ev_watcher_list *head;
227	sig_atomic_t gotsig;	408	sig_atomic_t volatile gotsig;
228	} ANSIG;	409	} ANSIG;
229		410
230	static ANSIG *signals;	411	static ANSIG *signals;
231	static int signalmax;	412	static int signalmax;
232		413
233	static int sigpipe [2];	414	static int sigpipe [2];
234	static sig_atomic_t gotsig;	415	static sig_atomic_t volatile gotsig;
235	static struct ev_io sigev;
236		416
237	static void	417	static void
238	signals_init (ANSIG *base, int count)	418	signals_init (ANSIG *base, int count)
239	{	419	{
240	while (count--)	420	while (count--)
241	{	421	{
242	base->head = 0;	422	base->head = 0;
243	base->gotsig = 0;	423	base->gotsig = 0;
		424
244	++base;	425	++base;
245	}	426	}
246	}	427	}
247		428
248	static void	429	static void
…		…
250	{	431	{
251	signals [signum - 1].gotsig = 1;	432	signals [signum - 1].gotsig = 1;
252		433
253	if (!gotsig)	434	if (!gotsig)
254	{	435	{
		436	int old_errno = errno;
255	gotsig = 1;	437	gotsig = 1;
256	write (sigpipe [1], &gotsig, 1);	438	write (sigpipe [1], &signum, 1);
		439	errno = old_errno;
257	}	440	}
258	}	441	}
259		442
260	static void	443	static void
261	sigcb (struct ev_io *iow, int revents)	444	sigcb (EV_P_ struct ev_io *iow, int revents)
262	{	445	{
263	struct ev_signal *w;	446	struct ev_watcher_list *w;
264	int sig;	447	int signum;
265		448
		449	read (sigpipe [0], &revents, 1);
266	gotsig = 0;	450	gotsig = 0;
267	read (sigpipe [0], &revents, 1);
268		451
269	for (sig = signalmax; sig--; )	452	for (signum = signalmax; signum--; )
270	if (signals [sig].gotsig)	453	if (signals [signum].gotsig)
271	{	454	{
272	signals [sig].gotsig = 0;	455	signals [signum].gotsig = 0;
273		456
274	for (w = signals [sig].head; w; w = w->next)	457	for (w = signals [signum].head; w; w = w->next)
275	event ((W)w, EV_SIGNAL);	458	event (EV_A_ (W)w, EV_SIGNAL);
276	}	459	}
277	}	460	}
278		461
279	static void	462	static void
280	siginit (void)	463	siginit (EV_P)
281	{	464	{
		465	#ifndef WIN32
282	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	466	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
283	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	467	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
284		468
285	/* rather than sort out wether we really need nb, set it */	469	/* rather than sort out wether we really need nb, set it */
286	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	470	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
287	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	471	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		472	#endif
288		473
289	evio_set (&sigev, sigpipe [0], EV_READ);	474	ev_io_set (&sigev, sigpipe [0], EV_READ);
290	evio_start (&sigev);	475	ev_io_start (EV_A_ &sigev);
		476	ev_unref (EV_A); /* child watcher should not keep loop alive */
291	}	477	}
292		478
293	/*****************************************************************************/	479	/*****************************************************************************/
294		480
295	static struct ev_idle **idles;	481	#ifndef WIN32
296	static int idlemax, idlecnt;
297		482
298	static struct ev_check **checks;	483	#ifndef WCONTINUED
299	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
300		518
301	/*****************************************************************************/	519	/*****************************************************************************/
302		520
		521	#if EV_USE_KQUEUE
		522	# include "ev_kqueue.c"
		523	#endif
303	#if HAVE_EPOLL	524	#if EV_USE_EPOLL
304	# include "ev_epoll.c"	525	# include "ev_epoll.c"
305	#endif	526	#endif
		527	#if EV_USEV_POLL
		528	# include "ev_poll.c"
		529	#endif
306	#if HAVE_SELECT	530	#if EV_USE_SELECT
307	# include "ev_select.c"	531	# include "ev_select.c"
308	#endif	532	#endif
309		533
310	int ev_init (int flags)	534	int
		535	ev_version_major (void)
311	{	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	{
312	#if HAVE_MONOTONIC	569	#if EV_USE_MONOTONIC
313	{	570	{
314	struct timespec ts;	571	struct timespec ts;
315	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	572	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
316	have_monotonic = 1;	573	have_monotonic = 1;
317	}	574	}
318	#endif	575	#endif
319		576
320	ev_now = ev_time ();	577	rt_now = ev_time ();
321	now = get_clock ();	578	mn_now = get_clock ();
322	diff = ev_now - now;	579	now_floor = mn_now;
		580	rtmn_diff = rt_now - mn_now;
323		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])
324	if (pipe (sigpipe))	678	if (pipe (sigpipe))
325	return 0;	679	return 0;
326		680
327	ev_method = EVMETHOD_NONE;	681	if (!default_loop)
328	#if HAVE_EPOLL
329	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
330	#endif
331	#if HAVE_SELECT
332	if (ev_method == EVMETHOD_NONE) select_init (flags);
333	#endif
334
335	if (ev_method)
336	{	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	{
337	evw_init (&sigev, sigcb);	693	ev_watcher_init (&sigev, sigcb);
		694	ev_set_priority (&sigev, EV_MAXPRI);
338	siginit ();	695	siginit (EV_A);
339	}
340		696
341	return ev_method;	697	#ifndef WIN32
342	}	698	ev_signal_init (&childev, childcb, SIGCHLD);
343		699	ev_set_priority (&childev, EV_MAXPRI);
344	/*****************************************************************************/	700	ev_signal_start (EV_A_ &childev);
345		701	ev_unref (EV_A); /* child watcher should not keep loop alive */
346	void ev_prefork (void)
347	{
348	/* nop */
349	}
350
351	void ev_postfork_parent (void)
352	{
353	/* nop */
354	}
355
356	void ev_postfork_child (void)
357	{
358	#if HAVE_EPOLL
359	if (ev_method == EVMETHOD_EPOLL)
360	epoll_postfork_child ();
361	#endif	702	#endif
		703	}
		704	else
		705	default_loop = 0;
		706	}
362		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 */
363	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);
364	close (sigpipe [0]);	736	close (sigpipe [0]);
365	close (sigpipe [1]);	737	close (sigpipe [1]);
366	pipe (sigpipe);	738	pipe (sigpipe);
		739
		740	ev_ref (EV_A); /* signal watcher */
367	siginit ();	741	siginit (EV_A);
368	}	742	}
369		743
370	/*****************************************************************************/	744	/*****************************************************************************/
371		745
372	static void	746	static void
373	fd_reify (void)	747	call_pending (EV_P)
374	{	748	{
375	int i;	749	int pri;
376		750
377	for (i = 0; i < fdchangecnt; ++i)	751	for (pri = NUMPRI; pri--; )
378	{	752	while (pendingcnt [pri])
379	int fd = fdchanges [i];
380	ANFD *anfd = anfds + fd;
381	struct ev_io *w;
382
383	int wev = 0;
384
385	for (w = anfd->head; w; w = w->next)
386	wev |= w->events;
387
388	if (anfd->wev != wev)
389	{	753	{
390	method_modify (fd, anfd->wev, wev);	754	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
391	anfd->wev = wev;
392	}
393	}
394		755
395	fdchangecnt = 0;
396	}
397
398	static void
399	call_pending ()
400	{
401	int i;
402
403	for (i = 0; i < pendingcnt; ++i)
404	{
405	ANPENDING *p = pendings + i;
406
407	if (p->w)	756	if (p->w)
408	{	757	{
409	p->w->pending = 0;	758	p->w->pending = 0;
410	p->w->cb (p->w, p->events);	759	p->w->cb (EV_A_ p->w, p->events);
411	}	760	}
412	}	761	}
413
414	pendingcnt = 0;
415	}	762	}
416		763
417	static void	764	static void
418	timers_reify ()	765	timers_reify (EV_P)
419	{	766	{
420	while (timercnt && timers [0]->at <= now)	767	while (timercnt && timers [0]->at <= mn_now)
421	{	768	{
422	struct ev_timer *w = timers [0];	769	struct ev_timer *w = timers [0];
423		770
424	/* first reschedule or stop timer */	771	/* first reschedule or stop timer */
425	if (w->repeat)	772	if (w->repeat)
426	{	773	{
		774	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
427	w->at = now + w->repeat;	775	w->at = mn_now + w->repeat;
428	assert (("timer timeout in the past, negative repeat?", w->at > now));
429	downheap ((WT *)timers, timercnt, 0);	776	downheap ((WT *)timers, timercnt, 0);
430	}	777	}
431	else	778	else
432	evtimer_stop (w); /* nonrepeating: stop timer */	779	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
433		780
434	event ((W)w, EV_TIMEOUT);	781	event (EV_A_ (W)w, EV_TIMEOUT);
435	}	782	}
436	}	783	}
437		784
438	static void	785	static void
439	periodics_reify ()	786	periodics_reify (EV_P)
440	{	787	{
441	while (periodiccnt && periodics [0]->at <= ev_now)	788	while (periodiccnt && periodics [0]->at <= rt_now)
442	{	789	{
443	struct ev_periodic *w = periodics [0];	790	struct ev_periodic *w = periodics [0];
444		791
445	/* first reschedule or stop timer */	792	/* first reschedule or stop timer */
446	if (w->interval)	793	if (w->interval)
447	{	794	{
448	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;	795	w->at += floor ((rt_now - w->at) / w->interval + 1.) * w->interval;
449	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));	796	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > rt_now));
450	downheap ((WT *)periodics, periodiccnt, 0);	797	downheap ((WT *)periodics, periodiccnt, 0);
451	}	798	}
452	else	799	else
453	evperiodic_stop (w); /* nonrepeating: stop timer */	800	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
454		801
455	event ((W)w, EV_TIMEOUT);	802	event (EV_A_ (W)w, EV_PERIODIC);
456	}	803	}
457	}	804	}
458		805
459	static void	806	static void
460	time_jump (ev_tstamp diff)	807	periodics_reschedule (EV_P)
461	{	808	{
462	int i;	809	int i;
463		810
464	/* adjust periodics */	811	/* adjust periodics after time jump */
465	for (i = 0; i < periodiccnt; ++i)	812	for (i = 0; i < periodiccnt; ++i)
466	{	813	{
467	struct ev_periodic *w = periodics [i];	814	struct ev_periodic *w = periodics [i];
468		815
469	if (w->interval)	816	if (w->interval)
470	{	817	{
471	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;	818	ev_tstamp diff = ceil ((rt_now - w->at) / w->interval) * w->interval;
472		819
473	if (fabs (diff) >= 1e-4)	820	if (fabs (diff) >= 1e-4)
474	{	821	{
475	evperiodic_stop (w);	822	ev_periodic_stop (EV_A_ w);
476	evperiodic_start (w);	823	ev_periodic_start (EV_A_ w);
477		824
478	i = 0; /* restart loop, inefficient, but time jumps should be rare */	825	i = 0; /* restart loop, inefficient, but time jumps should be rare */
479	}	826	}
480	}	827	}
481	}	828	}
482
483	/* adjust timers. this is easy, as the offset is the same for all */
484	for (i = 0; i < timercnt; ++i)
485	timers [i]->at += diff;
486	}	829	}
487		830
		831	inline int
		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
488	static void	849	static void
489	time_update ()	850	time_update (EV_P)
490	{	851	{
491	int i;	852	int i;
492		853
493	ev_now = ev_time ();	854	#if EV_USE_MONOTONIC
494
495	if (have_monotonic)	855	if (expect_true (have_monotonic))
496	{	856	{
497	ev_tstamp odiff = diff;	857	if (time_update_monotonic (EV_A))
498
499	for (i = 4; --i; ) /* loop a few times, before making important decisions */
500	{	858	{
501	now = get_clock ();	859	ev_tstamp odiff = rtmn_diff;
		860
		861	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		862	{
502	diff = ev_now - now;	863	rtmn_diff = rt_now - mn_now;
503		864
504	if (fabs (odiff - diff) < MIN_TIMEJUMP)	865	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
505	return; /* all is well */	866	return; /* all is well */
506		867
507	ev_now = ev_time ();	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) */
508	}	876	}
509
510	time_jump (diff - odiff);
511	}	877	}
512	else	878	else
		879	#endif
513	{	880	{
514	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	881	rt_now = ev_time ();
515	time_jump (ev_now - now);
516		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 */
		888	for (i = 0; i < timercnt; ++i)
		889	timers [i]->at += rt_now - mn_now;
		890	}
		891
517	now = ev_now;	892	mn_now = rt_now;
518	}	893	}
519	}	894	}
520		895
521	int ev_loop_done;	896	void
		897	ev_ref (EV_P)
		898	{
		899	++activecnt;
		900	}
522		901
		902	void
		903	ev_unref (EV_P)
		904	{
		905	--activecnt;
		906	}
		907
		908	static int loop_done;
		909
		910	void
523	void ev_loop (int flags)	911	ev_loop (EV_P_ int flags)
524	{	912	{
525	double block;	913	double block;
526	ev_loop_done = flags & EVLOOP_ONESHOT;	914	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
527
528	if (checkcnt)
529	{
530	queue_events ((W *)checks, checkcnt, EV_CHECK);
531	call_pending ();
532	}
533		915
534	do	916	do
535	{	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
536	/* update fd-related kernel structures */	925	/* update fd-related kernel structures */
537	fd_reify ();	926	fd_reify (EV_A);
538		927
539	/* calculate blocking time */	928	/* calculate blocking time */
540		929
541	/* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */	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	{
542	ev_now = ev_time ();	938	rt_now = ev_time ();
		939	mn_now = rt_now;
		940	}
543		941
544	if (flags & EVLOOP_NONBLOCK || idlecnt)	942	if (flags & EVLOOP_NONBLOCK || idlecnt)
545	block = 0.;	943	block = 0.;
546	else	944	else
547	{	945	{
548	block = MAX_BLOCKTIME;	946	block = MAX_BLOCKTIME;
549		947
550	if (timercnt)	948	if (timercnt)
551	{	949	{
552	ev_tstamp to = timers [0]->at - get_clock () + method_fudge;	950	ev_tstamp to = timers [0]->at - mn_now + method_fudge;
553	if (block > to) block = to;	951	if (block > to) block = to;
554	}	952	}
555		953
556	if (periodiccnt)	954	if (periodiccnt)
557	{	955	{
558	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;	956	ev_tstamp to = periodics [0]->at - rt_now + method_fudge;
559	if (block > to) block = to;	957	if (block > to) block = to;
560	}	958	}
561		959
562	if (block < 0.) block = 0.;	960	if (block < 0.) block = 0.;
563	}	961	}
564		962
565	method_poll (block);	963	method_poll (EV_A_ block);
566		964
567	/* update ev_now, do magic */	965	/* update rt_now, do magic */
568	time_update ();	966	time_update (EV_A);
569		967
570	/* queue pending timers and reschedule them */	968	/* queue pending timers and reschedule them */
		969	timers_reify (EV_A); /* relative timers called last */
571	periodics_reify (); /* absolute timers first */	970	periodics_reify (EV_A); /* absolute timers called first */
572	timers_reify (); /* relative timers second */
573		971
574	/* queue idle watchers unless io or timers are pending */	972	/* queue idle watchers unless io or timers are pending */
575	if (!pendingcnt)	973	if (!pendingcnt)
576	queue_events ((W *)idles, idlecnt, EV_IDLE);	974	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
577		975
578	/* queue check and possibly idle watchers */	976	/* queue check watchers, to be executed first */
		977	if (checkcnt)
579	queue_events ((W *)checks, checkcnt, EV_CHECK);	978	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
580		979
581	call_pending ();	980	call_pending (EV_A);
582	}	981	}
583	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;
584	}	992	}
585		993
586	/*****************************************************************************/	994	/*****************************************************************************/
587		995
588	static void	996	inline void
589	wlist_add (WL *head, WL elem)	997	wlist_add (WL *head, WL elem)
590	{	998	{
591	elem->next = *head;	999	elem->next = *head;
592	*head = elem;	1000	*head = elem;
593	}	1001	}
594		1002
595	static void	1003	inline void
596	wlist_del (WL *head, WL elem)	1004	wlist_del (WL *head, WL elem)
597	{	1005	{
598	while (*head)	1006	while (*head)
599	{	1007	{
600	if (*head == elem)	1008	if (*head == elem)
…		…
605		1013
606	head = &(*head)->next;	1014	head = &(*head)->next;
607	}	1015	}
608	}	1016	}
609		1017
610	static void	1018	inline void
		1019	ev_clear_pending (EV_P_ W w)
		1020	{
		1021	if (w->pending)
		1022	{
		1023	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1024	w->pending = 0;
		1025	}
		1026	}
		1027
		1028	inline void
611	ev_start (W w, int active)	1029	ev_start (EV_P_ W w, int active)
612	{	1030	{
613	w->pending = 0;	1031	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1032	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1033
614	w->active = active;	1034	w->active = active;
		1035	ev_ref (EV_A);
615	}	1036	}
616		1037
617	static void	1038	inline void
618	ev_stop (W w)	1039	ev_stop (EV_P_ W w)
619	{	1040	{
620	if (w->pending)	1041	ev_unref (EV_A);
621	pendings [w->pending - 1].w = 0;
622
623	w->active = 0;	1042	w->active = 0;
624	}	1043	}
625		1044
626	/*****************************************************************************/	1045	/*****************************************************************************/
627		1046
628	void	1047	void
629	evio_start (struct ev_io *w)	1048	ev_io_start (EV_P_ struct ev_io *w)
630	{	1049	{
		1050	int fd = w->fd;
		1051
631	if (ev_is_active (w))	1052	if (ev_is_active (w))
632	return;	1053	return;
633		1054
634	int fd = w->fd;	1055	assert (("ev_io_start called with negative fd", fd >= 0));
635		1056
636	ev_start ((W)w, 1);	1057	ev_start (EV_A_ (W)w, 1);
637	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1058	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
638	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1059	wlist_add ((WL *)&anfds[fd].head, (WL)w);
639		1060
640	++fdchangecnt;	1061	fd_change (EV_A_ fd);
641	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
642	fdchanges [fdchangecnt - 1] = fd;
643	}	1062	}
644		1063
645	void	1064	void
646	evio_stop (struct ev_io *w)	1065	ev_io_stop (EV_P_ struct ev_io *w)
647	{	1066	{
		1067	ev_clear_pending (EV_A_ (W)w);
648	if (!ev_is_active (w))	1068	if (!ev_is_active (w))
649	return;	1069	return;
650		1070
651	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1071	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
652	ev_stop ((W)w);	1072	ev_stop (EV_A_ (W)w);
653		1073
654	++fdchangecnt;	1074	fd_change (EV_A_ w->fd);
655	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
656	fdchanges [fdchangecnt - 1] = w->fd;
657	}	1075	}
658		1076
659
660	void	1077	void
661	evtimer_start (struct ev_timer *w)	1078	ev_timer_start (EV_P_ struct ev_timer *w)
662	{	1079	{
663	if (ev_is_active (w))	1080	if (ev_is_active (w))
664	return;	1081	return;
665		1082
666	w->at += now;	1083	w->at += mn_now;
667		1084
		1085	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1086
668	ev_start ((W)w, ++timercnt);	1087	ev_start (EV_A_ (W)w, ++timercnt);
669	array_needsize (timers, timermax, timercnt, );	1088	array_needsize (timers, timermax, timercnt, );
670	timers [timercnt - 1] = w;	1089	timers [timercnt - 1] = w;
671	upheap ((WT *)timers, timercnt - 1);	1090	upheap ((WT *)timers, timercnt - 1);
672	}	1091	}
673		1092
674	void	1093	void
675	evtimer_stop (struct ev_timer *w)	1094	ev_timer_stop (EV_P_ struct ev_timer *w)
676	{	1095	{
		1096	ev_clear_pending (EV_A_ (W)w);
677	if (!ev_is_active (w))	1097	if (!ev_is_active (w))
678	return;	1098	return;
679		1099
680	if (w->active < timercnt--)	1100	if (w->active < timercnt--)
681	{	1101	{
682	timers [w->active - 1] = timers [timercnt];	1102	timers [w->active - 1] = timers [timercnt];
683	downheap ((WT *)timers, timercnt, w->active - 1);	1103	downheap ((WT *)timers, timercnt, w->active - 1);
684	}	1104	}
685		1105
		1106	w->at = w->repeat;
		1107
686	ev_stop ((W)w);	1108	ev_stop (EV_A_ (W)w);
687	}	1109	}
688		1110
689	void	1111	void
690	evperiodic_start (struct ev_periodic *w)	1112	ev_timer_again (EV_P_ struct ev_timer *w)
691	{	1113	{
692	if (ev_is_active (w))	1114	if (ev_is_active (w))
		1115	{
		1116	if (w->repeat)
		1117	{
		1118	w->at = mn_now + w->repeat;
		1119	downheap ((WT *)timers, timercnt, w->active - 1);
		1120	}
		1121	else
		1122	ev_timer_stop (EV_A_ w);
		1123	}
		1124	else if (w->repeat)
		1125	ev_timer_start (EV_A_ w);
		1126	}
		1127
		1128	void
		1129	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1130	{
		1131	if (ev_is_active (w))
693	return;	1132	return;
		1133
		1134	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
694		1135
695	/* this formula differs from the one in periodic_reify because we do not always round up */	1136	/* this formula differs from the one in periodic_reify because we do not always round up */
696	if (w->interval)	1137	if (w->interval)
697	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;	1138	w->at += ceil ((rt_now - w->at) / w->interval) * w->interval;
698		1139
699	ev_start ((W)w, ++periodiccnt);	1140	ev_start (EV_A_ (W)w, ++periodiccnt);
700	array_needsize (periodics, periodicmax, periodiccnt, );	1141	array_needsize (periodics, periodicmax, periodiccnt, );
701	periodics [periodiccnt - 1] = w;	1142	periodics [periodiccnt - 1] = w;
702	upheap ((WT *)periodics, periodiccnt - 1);	1143	upheap ((WT *)periodics, periodiccnt - 1);
703	}	1144	}
704		1145
705	void	1146	void
706	evperiodic_stop (struct ev_periodic *w)	1147	ev_periodic_stop (EV_P_ struct ev_periodic *w)
707	{	1148	{
		1149	ev_clear_pending (EV_A_ (W)w);
708	if (!ev_is_active (w))	1150	if (!ev_is_active (w))
709	return;	1151	return;
710		1152
711	if (w->active < periodiccnt--)	1153	if (w->active < periodiccnt--)
712	{	1154	{
713	periodics [w->active - 1] = periodics [periodiccnt];	1155	periodics [w->active - 1] = periodics [periodiccnt];
714	downheap ((WT *)periodics, periodiccnt, w->active - 1);	1156	downheap ((WT *)periodics, periodiccnt, w->active - 1);
715	}	1157	}
716		1158
717	ev_stop ((W)w);	1159	ev_stop (EV_A_ (W)w);
718	}	1160	}
719		1161
720	void	1162	void
721	evsignal_start (struct ev_signal *w)	1163	ev_idle_start (EV_P_ struct ev_idle *w)
722	{	1164	{
723	if (ev_is_active (w))	1165	if (ev_is_active (w))
724	return;	1166	return;
725		1167
		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
726	ev_start ((W)w, 1);	1243	ev_start (EV_A_ (W)w, 1);
727	array_needsize (signals, signalmax, w->signum, signals_init);	1244	array_needsize (signals, signalmax, w->signum, signals_init);
728	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1245	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
729		1246
730	if (!w->next)	1247	if (!w->next)
731	{	1248	{
732	struct sigaction sa;	1249	struct sigaction sa;
733	sa.sa_handler = sighandler;	1250	sa.sa_handler = sighandler;
734	sigfillset (&sa.sa_mask);	1251	sigfillset (&sa.sa_mask);
735	sa.sa_flags = 0;	1252	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
736	sigaction (w->signum, &sa, 0);	1253	sigaction (w->signum, &sa, 0);
737	}	1254	}
738	}	1255	}
739		1256
740	void	1257	void
741	evsignal_stop (struct ev_signal *w)	1258	ev_signal_stop (EV_P_ struct ev_signal *w)
742	{	1259	{
		1260	ev_clear_pending (EV_A_ (W)w);
743	if (!ev_is_active (w))	1261	if (!ev_is_active (w))
744	return;	1262	return;
745		1263
746	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1264	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
747	ev_stop ((W)w);	1265	ev_stop (EV_A_ (W)w);
748		1266
749	if (!signals [w->signum - 1].head)	1267	if (!signals [w->signum - 1].head)
750	signal (w->signum, SIG_DFL);	1268	signal (w->signum, SIG_DFL);
751	}	1269	}
752		1270
753	void evidle_start (struct ev_idle *w)	1271	void
		1272	ev_child_start (EV_P_ struct ev_child *w)
754	{	1273	{
		1274	#if EV_MULTIPLICITY
		1275	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1276	#endif
755	if (ev_is_active (w))	1277	if (ev_is_active (w))
756	return;	1278	return;
757		1279
758	ev_start ((W)w, ++idlecnt);	1280	ev_start (EV_A_ (W)w, 1);
759	array_needsize (idles, idlemax, idlecnt, );	1281	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
760	idles [idlecnt - 1] = w;
761	}	1282	}
762		1283
763	void evidle_stop (struct ev_idle *w)	1284	void
		1285	ev_child_stop (EV_P_ struct ev_child *w)
764	{	1286	{
765	idles [w->active - 1] = idles [--idlecnt];	1287	ev_clear_pending (EV_A_ (W)w);
766	ev_stop ((W)w);
767	}
768
769	void evcheck_start (struct ev_check *w)
770	{
771	if (ev_is_active (w))	1288	if (ev_is_active (w))
772	return;	1289	return;
773		1290
774	ev_start ((W)w, ++checkcnt);	1291	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
775	array_needsize (checks, checkmax, checkcnt, );
776	checks [checkcnt - 1] = w;
777	}
778
779	void evcheck_stop (struct ev_check *w)
780	{
781	checks [w->active - 1] = checks [--checkcnt];
782	ev_stop ((W)w);	1292	ev_stop (EV_A_ (W)w);
783	}	1293	}
784		1294
785	/*****************************************************************************/	1295	/*****************************************************************************/
786		1296
787	#if 1	1297	struct ev_once
788		1298	{
789	struct ev_io wio;	1299	struct ev_io io;
790
791	static void
792	sin_cb (struct ev_io *w, int revents)
793	{
794	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
795	}
796
797	static void
798	ocb (struct ev_timer *w, int revents)
799	{
800	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
801	evtimer_stop (w);
802	evtimer_start (w);
803	}
804
805	static void
806	scb (struct ev_signal *w, int revents)
807	{
808	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
809	evio_stop (&wio);
810	evio_start (&wio);
811	}
812
813	static void
814	gcb (struct ev_signal *w, int revents)
815	{
816	fprintf (stderr, "generic %x\n", revents);
817
818	}
819
820	int main (void)
821	{
822	ev_init (0);
823
824	evio_init (&wio, sin_cb, 0, EV_READ);
825	evio_start (&wio);
826
827	struct ev_timer t[10000];
828
829	#if 0
830	int i;
831	for (i = 0; i < 10000; ++i)
832	{
833	struct ev_timer *w = t + i;
834	evw_init (w, ocb, i);
835	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
836	evtimer_start (w);
837	if (drand48 () < 0.5)
838	evtimer_stop (w);
839	}
840	#endif
841
842	struct ev_timer t1;	1300	struct ev_timer to;
843	evtimer_init (&t1, ocb, 5, 10);	1301	void (*cb)(int revents, void *arg);
844	evtimer_start (&t1);	1302	void *arg;
		1303	};
845		1304
846	struct ev_signal sig;	1305	static void
847	evsignal_init (&sig, scb, SIGQUIT);	1306	once_cb (EV_P_ struct ev_once *once, int revents)
848	evsignal_start (&sig);	1307	{
		1308	void (*cb)(int revents, void *arg) = once->cb;
		1309	void *arg = once->arg;
849		1310
850	struct ev_check cw;	1311	ev_io_stop (EV_A_ &once->io);
851	evcheck_init (&cw, gcb);	1312	ev_timer_stop (EV_A_ &once->to);
852	evcheck_start (&cw);	1313	free (once);
853		1314
854	struct ev_idle iw;	1315	cb (revents, arg);
855	evidle_init (&iw, gcb);
856	evidle_start (&iw);
857
858	ev_loop (0);
859
860	return 0;
861	}	1316	}
862		1317
863	#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	}
864		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	}
865		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));
866		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;
867		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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