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Comparing libev/ev.c (file contents):
Revision 1.10 by root, Wed Oct 31 07:36:03 2007 UTC vs.
Revision 1.57 by root, Sun Nov 4 16:43:53 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#ifndef EV_STANDALONE
		32	# include "config.h"
		33	#endif
		34
1	#include <math.h>	35	#include <math.h>
2	#include <stdlib.h>	36	#include <stdlib.h>
3	#include <unistd.h>	37	#include <unistd.h>
4	#include <fcntl.h>	38	#include <fcntl.h>
5	#include <signal.h>	39	#include <signal.h>
		40	#include <stddef.h>
6		41
7	#include <stdio.h>	42	#include <stdio.h>
8		43
9	#include <assert.h>	44	#include <assert.h>
10	#include <errno.h>	45	#include <errno.h>
		46	#include <sys/types.h>
		47	#ifndef WIN32
		48	# include <sys/wait.h>
		49	#endif
11	#include <sys/time.h>	50	#include <sys/time.h>
12	#include <time.h>	51	#include <time.h>
13		52
		53	/**/
		54
14	#ifndef HAVE_MONOTONIC	55	#ifndef EV_USE_MONOTONIC
		56	# define EV_USE_MONOTONIC 1
		57	#endif
		58
		59	#ifndef EV_USE_SELECT
		60	# define EV_USE_SELECT 1
		61	#endif
		62
		63	#ifndef EV_USEV_POLL
		64	# define EV_USEV_POLL 0 /* poll is usually slower than select, and not as well tested */
		65	#endif
		66
		67	#ifndef EV_USE_EPOLL
		68	# define EV_USE_EPOLL 0
		69	#endif
		70
		71	#ifndef EV_USE_KQUEUE
		72	# define EV_USE_KQUEUE 0
		73	#endif
		74
		75	#ifndef EV_USE_REALTIME
		76	# define EV_USE_REALTIME 1
		77	#endif
		78
		79	/**/
		80
15	# ifdef CLOCK_MONOTONIC	81	#ifndef CLOCK_MONOTONIC
		82	# undef EV_USE_MONOTONIC
16	# define HAVE_MONOTONIC 1	83	# define EV_USE_MONOTONIC 0
17	# endif	84	#endif
18	#endif
19		85
20	#ifndef HAVE_SELECT
21	# define HAVE_SELECT 1
22	#endif
23
24	#ifndef HAVE_EPOLL
25	# define HAVE_EPOLL 0
26	#endif
27
28	#ifndef HAVE_REALTIME	86	#ifndef CLOCK_REALTIME
29	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	87	# undef EV_USE_REALTIME
		88	# define EV_USE_REALTIME 0
30	#endif	89	#endif
		90
		91	/**/
31		92
32	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	93	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
33	#define MAX_BLOCKTIME 60.	94	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		95	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		96	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
34		97
35	#include "ev.h"	98	#include "ev.h"
36		99
37	struct ev_watcher {	100	#if __GNUC__ >= 3
38	EV_WATCHER (ev_watcher);	101	# define expect(expr,value) __builtin_expect ((expr),(value))
39	};	102	# define inline inline
		103	#else
		104	# define expect(expr,value) (expr)
		105	# define inline static
		106	#endif
40		107
41	struct ev_watcher_list {	108	#define expect_false(expr) expect ((expr) != 0, 0)
42	EV_WATCHER_LIST (ev_watcher_list);	109	#define expect_true(expr) expect ((expr) != 0, 1)
43	};	110
		111	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		112	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
44		113
45	typedef struct ev_watcher *W;	114	typedef struct ev_watcher *W;
46	typedef struct ev_watcher_list *WL;	115	typedef struct ev_watcher_list *WL;
		116	typedef struct ev_watcher_time *WT;
47		117
48	static ev_tstamp now, diff; /* monotonic clock */	118	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
49	ev_tstamp ev_now;
50	int ev_method;
51
52	static int have_monotonic; /* runtime */
53
54	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
55	static void (*method_modify)(int fd, int oev, int nev);
56	static void (*method_poll)(ev_tstamp timeout);
57		119
58	/*****************************************************************************/	120	/*****************************************************************************/
59		121
60	ev_tstamp	122	typedef struct
		123	{
		124	struct ev_watcher_list *head;
		125	unsigned char events;
		126	unsigned char reify;
		127	} ANFD;
		128
		129	typedef struct
		130	{
		131	W w;
		132	int events;
		133	} ANPENDING;
		134
		135	#if EV_MULTIPLICITY
		136
		137	struct ev_loop
		138	{
		139	# define VAR(name,decl) decl;
		140	# include "ev_vars.h"
		141	};
		142	# undef VAR
		143	# include "ev_wrap.h"
		144
		145	#else
		146
		147	# define VAR(name,decl) static decl;
		148	# include "ev_vars.h"
		149	# undef VAR
		150
		151	#endif
		152
		153	/*****************************************************************************/
		154
		155	inline ev_tstamp
61	ev_time (void)	156	ev_time (void)
62	{	157	{
63	#if HAVE_REALTIME	158	#if EV_USE_REALTIME
64	struct timespec ts;	159	struct timespec ts;
65	clock_gettime (CLOCK_REALTIME, &ts);	160	clock_gettime (CLOCK_REALTIME, &ts);
66	return ts.tv_sec + ts.tv_nsec * 1e-9;	161	return ts.tv_sec + ts.tv_nsec * 1e-9;
67	#else	162	#else
68	struct timeval tv;	163	struct timeval tv;
69	gettimeofday (&tv, 0);	164	gettimeofday (&tv, 0);
70	return tv.tv_sec + tv.tv_usec * 1e-6;	165	return tv.tv_sec + tv.tv_usec * 1e-6;
71	#endif	166	#endif
72	}	167	}
73		168
74	static ev_tstamp	169	inline ev_tstamp
75	get_clock (void)	170	get_clock (void)
76	{	171	{
77	#if HAVE_MONOTONIC	172	#if EV_USE_MONOTONIC
78	if (have_monotonic)	173	if (expect_true (have_monotonic))
79	{	174	{
80	struct timespec ts;	175	struct timespec ts;
81	clock_gettime (CLOCK_MONOTONIC, &ts);	176	clock_gettime (CLOCK_MONOTONIC, &ts);
82	return ts.tv_sec + ts.tv_nsec * 1e-9;	177	return ts.tv_sec + ts.tv_nsec * 1e-9;
83	}	178	}
84	#endif	179	#endif
85		180
86	return ev_time ();	181	return ev_time ();
87	}	182	}
88		183
		184	ev_tstamp
		185	ev_now (EV_P)
		186	{
		187	return rt_now;
		188	}
		189
		190	#define array_roundsize(base,n) ((n) | 4 & ~3)
		191
89	#define array_needsize(base,cur,cnt,init) \	192	#define array_needsize(base,cur,cnt,init) \
90	if ((cnt) > cur) \	193	if (expect_false ((cnt) > cur)) \
91	{ \	194	{ \
92	int newcnt = cur ? cur << 1 : 16; \	195	int newcnt = cur; \
93	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	196	do \
		197	{ \
		198	newcnt = array_roundsize (base, newcnt << 1); \
		199	} \
		200	while ((cnt) > newcnt); \
		201	\
94	base = realloc (base, sizeof (*base) * (newcnt)); \	202	base = realloc (base, sizeof (*base) * (newcnt)); \
95	init (base + cur, newcnt - cur); \	203	init (base + cur, newcnt - cur); \
96	cur = newcnt; \	204	cur = newcnt; \
97	}	205	}
98		206
99	/*****************************************************************************/	207	/*****************************************************************************/
100		208
101	typedef struct
102	{
103	struct ev_io *head;
104	unsigned char wev, rev; /* want, received event set */
105	} ANFD;
106
107	static ANFD *anfds;
108	static int anfdmax;
109
110	static int *fdchanges;
111	static int fdchangemax, fdchangecnt;
112
113	static void	209	static void
114	anfds_init (ANFD *base, int count)	210	anfds_init (ANFD *base, int count)
115	{	211	{
116	while (count--)	212	while (count--)
117	{	213	{
118	base->head = 0;	214	base->head = 0;
119	base->wev = base->rev = EV_NONE;	215	base->events = EV_NONE;
		216	base->reify = 0;
		217
120	++base;	218	++base;
121	}	219	}
122	}	220	}
123		221
124	typedef struct
125	{
126	W w;
127	int events;
128	} ANPENDING;
129
130	static ANPENDING *pendings;
131	static int pendingmax, pendingcnt;
132
133	static void	222	static void
134	event (W w, int events)	223	event (EV_P_ W w, int events)
135	{	224	{
		225	if (w->pending)
		226	{
		227	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		228	return;
		229	}
		230
136	w->pending = ++pendingcnt;	231	w->pending = ++pendingcnt [ABSPRI (w)];
137	array_needsize (pendings, pendingmax, pendingcnt, );	232	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
138	pendings [pendingcnt - 1].w = w;	233	pendings [ABSPRI (w)][w->pending - 1].w = w;
139	pendings [pendingcnt - 1].events = events;	234	pendings [ABSPRI (w)][w->pending - 1].events = events;
140	}	235	}
141		236
142	static void	237	static void
		238	queue_events (EV_P_ W *events, int eventcnt, int type)
		239	{
		240	int i;
		241
		242	for (i = 0; i < eventcnt; ++i)
		243	event (EV_A_ events [i], type);
		244	}
		245
		246	static void
143	fd_event (int fd, int events)	247	fd_event (EV_P_ int fd, int events)
144	{	248	{
145	ANFD *anfd = anfds + fd;	249	ANFD *anfd = anfds + fd;
146	struct ev_io *w;	250	struct ev_io *w;
147		251
148	for (w = anfd->head; w; w = w->next)	252	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
149	{	253	{
150	int ev = w->events & events;	254	int ev = w->events & events;
151		255
152	if (ev)	256	if (ev)
153	event ((W)w, ev);	257	event (EV_A_ (W)w, ev);
154	}	258	}
155	}	259	}
156		260
		261	/*****************************************************************************/
		262
157	static void	263	static void
158	queue_events (W *events, int eventcnt, int type)	264	fd_reify (EV_P)
159	{	265	{
160	int i;	266	int i;
161		267
162	for (i = 0; i < eventcnt; ++i)	268	for (i = 0; i < fdchangecnt; ++i)
163	event (events [i], type);	269	{
		270	int fd = fdchanges [i];
		271	ANFD *anfd = anfds + fd;
		272	struct ev_io *w;
		273
		274	int events = 0;
		275
		276	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		277	events |= w->events;
		278
		279	anfd->reify = 0;
		280
		281	if (anfd->events != events)
		282	{
		283	method_modify (EV_A_ fd, anfd->events, events);
		284	anfd->events = events;
		285	}
		286	}
		287
		288	fdchangecnt = 0;
		289	}
		290
		291	static void
		292	fd_change (EV_P_ int fd)
		293	{
		294	if (anfds [fd].reify || fdchangecnt < 0)
		295	return;
		296
		297	anfds [fd].reify = 1;
		298
		299	++fdchangecnt;
		300	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		301	fdchanges [fdchangecnt - 1] = fd;
		302	}
		303
		304	static void
		305	fd_kill (EV_P_ int fd)
		306	{
		307	struct ev_io *w;
		308
		309	while ((w = (struct ev_io *)anfds [fd].head))
		310	{
		311	ev_io_stop (EV_A_ w);
		312	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		313	}
		314	}
		315
		316	/* called on EBADF to verify fds */
		317	static void
		318	fd_ebadf (EV_P)
		319	{
		320	int fd;
		321
		322	for (fd = 0; fd < anfdmax; ++fd)
		323	if (anfds [fd].events)
		324	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		325	fd_kill (EV_A_ fd);
		326	}
		327
		328	/* called on ENOMEM in select/poll to kill some fds and retry */
		329	static void
		330	fd_enomem (EV_P)
		331	{
		332	int fd = anfdmax;
		333
		334	while (fd--)
		335	if (anfds [fd].events)
		336	{
		337	close (fd);
		338	fd_kill (EV_A_ fd);
		339	return;
		340	}
		341	}
		342
		343	/* susually called after fork if method needs to re-arm all fds from scratch */
		344	static void
		345	fd_rearm_all (EV_P)
		346	{
		347	int fd;
		348
		349	/* this should be highly optimised to not do anything but set a flag */
		350	for (fd = 0; fd < anfdmax; ++fd)
		351	if (anfds [fd].events)
		352	{
		353	anfds [fd].events = 0;
		354	fd_change (fd);
		355	}
164	}	356	}
165		357
166	/*****************************************************************************/	358	/*****************************************************************************/
167		359
168	static struct ev_timer **atimers;
169	static int atimermax, atimercnt;
170
171	static struct ev_timer **rtimers;
172	static int rtimermax, rtimercnt;
173
174	static void	360	static void
175	upheap (struct ev_timer **timers, int k)	361	upheap (WT *heap, int k)
176	{	362	{
177	struct ev_timer *w = timers [k];	363	WT w = heap [k];
178		364
179	while (k && timers [k >> 1]->at > w->at)	365	while (k && heap [k >> 1]->at > w->at)
180	{	366	{
181	timers [k] = timers [k >> 1];	367	heap [k] = heap [k >> 1];
182	timers [k]->active = k + 1;	368	heap [k]->active = k + 1;
183	k >>= 1;	369	k >>= 1;
184	}	370	}
185		371
186	timers [k] = w;	372	heap [k] = w;
187	timers [k]->active = k + 1;	373	heap [k]->active = k + 1;
188		374
189	}	375	}
190		376
191	static void	377	static void
192	downheap (struct ev_timer **timers, int N, int k)	378	downheap (WT *heap, int N, int k)
193	{	379	{
194	struct ev_timer *w = timers [k];	380	WT w = heap [k];
195		381
196	while (k < (N >> 1))	382	while (k < (N >> 1))
197	{	383	{
198	int j = k << 1;	384	int j = k << 1;
199		385
200	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	386	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
201	++j;	387	++j;
202		388
203	if (w->at <= timers [j]->at)	389	if (w->at <= heap [j]->at)
204	break;	390	break;
205		391
206	timers [k] = timers [j];	392	heap [k] = heap [j];
207	timers [k]->active = k + 1;	393	heap [k]->active = k + 1;
208	k = j;	394	k = j;
209	}	395	}
210		396
211	timers [k] = w;	397	heap [k] = w;
212	timers [k]->active = k + 1;	398	heap [k]->active = k + 1;
213	}	399	}
214		400
215	/*****************************************************************************/	401	/*****************************************************************************/
216		402
217	typedef struct	403	typedef struct
218	{	404	{
219	struct ev_signal *head;	405	struct ev_watcher_list *head;
220	sig_atomic_t gotsig;	406	sig_atomic_t volatile gotsig;
221	} ANSIG;	407	} ANSIG;
222		408
223	static ANSIG *signals;	409	static ANSIG *signals;
224	static int signalmax;	410	static int signalmax;
225		411
226	static int sigpipe [2];	412	static int sigpipe [2];
227	static sig_atomic_t gotsig;	413	static sig_atomic_t volatile gotsig;
228	static struct ev_io sigev;
229		414
230	static void	415	static void
231	signals_init (ANSIG *base, int count)	416	signals_init (ANSIG *base, int count)
232	{	417	{
233	while (count--)	418	while (count--)
234	{	419	{
235	base->head = 0;	420	base->head = 0;
236	base->gotsig = 0;	421	base->gotsig = 0;
		422
237	++base;	423	++base;
238	}	424	}
239	}	425	}
240		426
241	static void	427	static void
…		…
243	{	429	{
244	signals [signum - 1].gotsig = 1;	430	signals [signum - 1].gotsig = 1;
245		431
246	if (!gotsig)	432	if (!gotsig)
247	{	433	{
		434	int old_errno = errno;
248	gotsig = 1;	435	gotsig = 1;
249	write (sigpipe [1], &gotsig, 1);	436	write (sigpipe [1], &signum, 1);
		437	errno = old_errno;
250	}	438	}
251	}	439	}
252		440
253	static void	441	static void
254	sigcb (struct ev_io *iow, int revents)	442	sigcb (EV_P_ struct ev_io *iow, int revents)
255	{	443	{
256	struct ev_signal *w;	444	struct ev_watcher_list *w;
257	int sig;	445	int signum;
258		446
		447	read (sigpipe [0], &revents, 1);
259	gotsig = 0;	448	gotsig = 0;
260	read (sigpipe [0], &revents, 1);
261		449
262	for (sig = signalmax; sig--; )	450	for (signum = signalmax; signum--; )
263	if (signals [sig].gotsig)	451	if (signals [signum].gotsig)
264	{	452	{
265	signals [sig].gotsig = 0;	453	signals [signum].gotsig = 0;
266		454
267	for (w = signals [sig].head; w; w = w->next)	455	for (w = signals [signum].head; w; w = w->next)
268	event ((W)w, EV_SIGNAL);	456	event (EV_A_ (W)w, EV_SIGNAL);
269	}	457	}
270	}	458	}
271		459
272	static void	460	static void
273	siginit (void)	461	siginit (EV_P)
274	{	462	{
		463	#ifndef WIN32
275	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	464	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
276	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	465	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277		466
278	/* rather than sort out wether we really need nb, set it */	467	/* rather than sort out wether we really need nb, set it */
279	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	468	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
280	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	469	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		470	#endif
281		471
282	evio_set (&sigev, sigpipe [0], EV_READ);	472	ev_io_set (&sigev, sigpipe [0], EV_READ);
283	evio_start (&sigev);	473	ev_io_start (EV_A_ &sigev);
		474	ev_unref (EV_A); /* child watcher should not keep loop alive */
284	}	475	}
285		476
286	/*****************************************************************************/	477	/*****************************************************************************/
287		478
288	static struct ev_idle **idles;	479	#ifndef WIN32
289	static int idlemax, idlecnt;
290		480
291	static struct ev_check **checks;	481	#ifndef WCONTINUED
292	static int checkmax, checkcnt;	482	# define WCONTINUED 0
		483	#endif
		484
		485	static void
		486	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		487	{
		488	struct ev_child *w;
		489
		490	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		491	if (w->pid == pid || !w->pid)
		492	{
		493	w->priority = sw->priority; /* need to do it *now* */
		494	w->rpid = pid;
		495	w->rstatus = status;
		496	event (EV_A_ (W)w, EV_CHILD);
		497	}
		498	}
		499
		500	static void
		501	childcb (EV_P_ struct ev_signal *sw, int revents)
		502	{
		503	int pid, status;
		504
		505	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		506	{
		507	/* make sure we are called again until all childs have been reaped */
		508	event (EV_A_ (W)sw, EV_SIGNAL);
		509
		510	child_reap (EV_A_ sw, pid, pid, status);
		511	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		512	}
		513	}
		514
		515	#endif
293		516
294	/*****************************************************************************/	517	/*****************************************************************************/
295		518
		519	#if EV_USE_KQUEUE
		520	# include "ev_kqueue.c"
		521	#endif
296	#if HAVE_EPOLL	522	#if EV_USE_EPOLL
297	# include "ev_epoll.c"	523	# include "ev_epoll.c"
298	#endif	524	#endif
		525	#if EV_USEV_POLL
		526	# include "ev_poll.c"
		527	#endif
299	#if HAVE_SELECT	528	#if EV_USE_SELECT
300	# include "ev_select.c"	529	# include "ev_select.c"
301	#endif	530	#endif
302		531
303	int ev_init (int flags)	532	int
		533	ev_version_major (void)
304	{	534	{
		535	return EV_VERSION_MAJOR;
		536	}
		537
		538	int
		539	ev_version_minor (void)
		540	{
		541	return EV_VERSION_MINOR;
		542	}
		543
		544	/* return true if we are running with elevated privileges and should ignore env variables */
		545	static int
		546	enable_secure (void)
		547	{
		548	#ifdef WIN32
		549	return 0;
		550	#else
		551	return getuid () != geteuid ()
		552	|| getgid () != getegid ();
		553	#endif
		554	}
		555
		556	int
		557	ev_method (EV_P)
		558	{
		559	return method;
		560	}
		561
		562	static void
		563	loop_init (EV_P_ int methods)
		564	{
		565	if (!method)
		566	{
305	#if HAVE_MONOTONIC	567	#if EV_USE_MONOTONIC
306	{	568	{
307	struct timespec ts;	569	struct timespec ts;
308	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	570	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309	have_monotonic = 1;	571	have_monotonic = 1;
310	}	572	}
311	#endif	573	#endif
312		574
313	ev_now = ev_time ();	575	rt_now = ev_time ();
314	now = get_clock ();	576	mn_now = get_clock ();
315	diff = ev_now - now;	577	now_floor = mn_now;
		578	rtmn_diff = rt_now - mn_now;
316		579
		580	if (methods == EVMETHOD_AUTO)
		581	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		582	methods = atoi (getenv ("LIBEV_METHODS"));
		583	else
		584	methods = EVMETHOD_ANY;
		585
		586	method = 0;
		587	#if EV_USE_KQUEUE
		588	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		589	#endif
		590	#if EV_USE_EPOLL
		591	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		592	#endif
		593	#if EV_USEV_POLL
		594	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		595	#endif
		596	#if EV_USE_SELECT
		597	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		598	#endif
		599	}
		600	}
		601
		602	void
		603	loop_destroy (EV_P)
		604	{
		605	#if EV_USE_KQUEUE
		606	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		607	#endif
		608	#if EV_USE_EPOLL
		609	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		610	#endif
		611	#if EV_USEV_POLL
		612	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		613	#endif
		614	#if EV_USE_SELECT
		615	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		616	#endif
		617
		618	method = 0;
		619	/*TODO*/
		620	}
		621
		622	void
		623	loop_fork (EV_P)
		624	{
		625	/*TODO*/
		626	#if EV_USE_EPOLL
		627	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		628	#endif
		629	#if EV_USE_KQUEUE
		630	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		631	#endif
		632	}
		633
		634	#if EV_MULTIPLICITY
		635	struct ev_loop *
		636	ev_loop_new (int methods)
		637	{
		638	struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop));
		639
		640	loop_init (EV_A_ methods);
		641
		642	if (ev_methods (EV_A))
		643	return loop;
		644
		645	return 0;
		646	}
		647
		648	void
		649	ev_loop_destroy (EV_P)
		650	{
		651	loop_destroy (EV_A);
		652	free (loop);
		653	}
		654
		655	void
		656	ev_loop_fork (EV_P)
		657	{
		658	loop_fork (EV_A);
		659	}
		660
		661	#endif
		662
		663	#if EV_MULTIPLICITY
		664	struct ev_loop default_loop_struct;
		665	static struct ev_loop *default_loop;
		666
		667	struct ev_loop *
		668	#else
		669	static int default_loop;
		670
		671	int
		672	#endif
		673	ev_default_loop (int methods)
		674	{
		675	if (sigpipe [0] == sigpipe [1])
317	if (pipe (sigpipe))	676	if (pipe (sigpipe))
318	return 0;	677	return 0;
319		678
320	ev_method = EVMETHOD_NONE;	679	if (!default_loop)
321	#if HAVE_EPOLL
322	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
323	#endif
324	#if HAVE_SELECT
325	if (ev_method == EVMETHOD_NONE) select_init (flags);
326	#endif
327
328	if (ev_method)
329	{	680	{
		681	#if EV_MULTIPLICITY
		682	struct ev_loop *loop = default_loop = &default_loop_struct;
		683	#else
		684	default_loop = 1;
		685	#endif
		686
		687	loop_init (EV_A_ methods);
		688
		689	if (ev_method (EV_A))
		690	{
330	evw_init (&sigev, sigcb, 0);	691	ev_watcher_init (&sigev, sigcb);
		692	ev_set_priority (&sigev, EV_MAXPRI);
331	siginit ();	693	siginit (EV_A);
332	}
333		694
334	return ev_method;	695	#ifndef WIN32
335	}	696	ev_signal_init (&childev, childcb, SIGCHLD);
336		697	ev_set_priority (&childev, EV_MAXPRI);
337	/*****************************************************************************/	698	ev_signal_start (EV_A_ &childev);
338		699	ev_unref (EV_A); /* child watcher should not keep loop alive */
339	void ev_prefork (void)
340	{
341	}
342
343	void ev_postfork_parent (void)
344	{
345	}
346
347	void ev_postfork_child (void)
348	{
349	#if HAVE_EPOLL
350	if (ev_method == EVMETHOD_EPOLL)
351	epoll_postfork_child ();
352	#endif	700	#endif
		701	}
		702	else
		703	default_loop = 0;
		704	}
353		705
		706	return default_loop;
		707	}
		708
		709	void
		710	ev_default_destroy (void)
		711	{
		712	#if EV_MULTIPLICITY
		713	struct ev_loop *loop = default_loop;
		714	#endif
		715
		716	ev_ref (EV_A); /* child watcher */
		717	ev_signal_stop (EV_A_ &childev);
		718
		719	ev_ref (EV_A); /* signal watcher */
354	evio_stop (&sigev);	720	ev_io_stop (EV_A_ &sigev);
		721
		722	close (sigpipe [0]); sigpipe [0] = 0;
		723	close (sigpipe [1]); sigpipe [1] = 0;
		724
		725	loop_destroy (EV_A);
		726	}
		727
		728	void
		729	ev_default_fork (EV_P)
		730	{
		731	loop_fork (EV_A);
		732
		733	ev_io_stop (EV_A_ &sigev);
355	close (sigpipe [0]);	734	close (sigpipe [0]);
356	close (sigpipe [1]);	735	close (sigpipe [1]);
357	pipe (sigpipe);	736	pipe (sigpipe);
		737
		738	ev_ref (EV_A); /* signal watcher */
358	siginit ();	739	siginit (EV_A);
359	}	740	}
360		741
361	/*****************************************************************************/	742	/*****************************************************************************/
362		743
363	static void	744	static void
364	fd_reify (void)	745	call_pending (EV_P)
365	{	746	{
366	int i;	747	int pri;
367		748
368	for (i = 0; i < fdchangecnt; ++i)	749	for (pri = NUMPRI; pri--; )
369	{	750	while (pendingcnt [pri])
370	int fd = fdchanges [i];
371	ANFD *anfd = anfds + fd;
372	struct ev_io *w;
373
374	int wev = 0;
375
376	for (w = anfd->head; w; w = w->next)
377	wev |= w->events;
378
379	if (anfd->wev != wev)
380	{	751	{
381	method_modify (fd, anfd->wev, wev);	752	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
382	anfd->wev = wev;
383	}
384	}
385		753
386	fdchangecnt = 0;
387	}
388
389	static void
390	call_pending ()
391	{
392	int i;
393
394	for (i = 0; i < pendingcnt; ++i)
395	{
396	ANPENDING *p = pendings + i;
397
398	if (p->w)	754	if (p->w)
399	{	755	{
400	p->w->pending = 0;	756	p->w->pending = 0;
401	p->w->cb (p->w, p->events);	757	p->w->cb (EV_A_ p->w, p->events);
402	}	758	}
403	}	759	}
404
405	pendingcnt = 0;
406	}	760	}
407		761
408	static void	762	static void
409	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	763	timers_reify (EV_P)
410	{	764	{
411	while (timercnt && timers [0]->at <= now)	765	while (timercnt && timers [0]->at <= mn_now)
412	{	766	{
413	struct ev_timer *w = timers [0];	767	struct ev_timer *w = timers [0];
414		768
415	/* first reschedule or stop timer */	769	/* first reschedule or stop timer */
416	if (w->repeat)	770	if (w->repeat)
417	{	771	{
418	if (w->is_abs)	772	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
419	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
420	else
421	w->at = now + w->repeat;	773	w->at = mn_now + w->repeat;
422
423	assert (w->at > now);
424
425	downheap (timers, timercnt, 0);	774	downheap ((WT *)timers, timercnt, 0);
426	}	775	}
427	else	776	else
		777	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		778
		779	event (EV_A_ (W)w, EV_TIMEOUT);
		780	}
		781	}
		782
		783	static void
		784	periodics_reify (EV_P)
		785	{
		786	while (periodiccnt && periodics [0]->at <= rt_now)
		787	{
		788	struct ev_periodic *w = periodics [0];
		789
		790	/* first reschedule or stop timer */
		791	if (w->interval)
428	{	792	{
429	evtimer_stop (w); /* nonrepeating: stop timer */	793	w->at += floor ((rt_now - w->at) / w->interval + 1.) * w->interval;
430	--timercnt; /* maybe pass by reference instead? */	794	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", w->at > rt_now));
		795	downheap ((WT *)periodics, periodiccnt, 0);
431	}	796	}
		797	else
		798	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
432		799
433	event ((W)w, EV_TIMEOUT);	800	event (EV_A_ (W)w, EV_PERIODIC);
434	}	801	}
435	}	802	}
436		803
437	static void	804	static void
438	time_update ()	805	periodics_reschedule (EV_P)
439	{	806	{
440	int i;	807	int i;
441	ev_now = ev_time ();
442		808
443	if (have_monotonic)	809	/* adjust periodics after time jump */
		810	for (i = 0; i < periodiccnt; ++i)
444	{	811	{
445	ev_tstamp odiff = diff;	812	struct ev_periodic *w = periodics [i];
446		813
447	/* detecting time jumps is much more difficult */	814	if (w->interval)
448	for (i = 2; --i; ) /* loop a few times, before making important decisions */
449	{	815	{
450	now = get_clock ();	816	ev_tstamp diff = ceil ((rt_now - w->at) / w->interval) * w->interval;
451	diff = ev_now - now;
452		817
453	if (fabs (odiff - diff) < MIN_TIMEJUMP)	818	if (fabs (diff) >= 1e-4)
454	return; /* all is well */	819	{
		820	ev_periodic_stop (EV_A_ w);
		821	ev_periodic_start (EV_A_ w);
455		822
456	ev_now = ev_time ();	823	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		824	}
457	}	825	}
		826	}
		827	}
458		828
459	/* time jump detected, reschedule atimers */	829	inline int
460	for (i = 0; i < atimercnt; ++i)	830	time_update_monotonic (EV_P)
		831	{
		832	mn_now = get_clock ();
		833
		834	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		835	{
		836	rt_now = rtmn_diff + mn_now;
		837	return 0;
		838	}
		839	else
		840	{
		841	now_floor = mn_now;
		842	rt_now = ev_time ();
		843	return 1;
		844	}
		845	}
		846
		847	static void
		848	time_update (EV_P)
		849	{
		850	int i;
		851
		852	#if EV_USE_MONOTONIC
		853	if (expect_true (have_monotonic))
		854	{
		855	if (time_update_monotonic (EV_A))
461	{	856	{
462	struct ev_timer *w = atimers [i];	857	ev_tstamp odiff = rtmn_diff;
463	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	858
		859	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		860	{
		861	rtmn_diff = rt_now - mn_now;
		862
		863	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		864	return; /* all is well */
		865
		866	rt_now = ev_time ();
		867	mn_now = get_clock ();
		868	now_floor = mn_now;
		869	}
		870
		871	periodics_reschedule (EV_A);
		872	/* no timer adjustment, as the monotonic clock doesn't jump */
		873	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
464	}	874	}
465	}	875	}
466	else	876	else
		877	#endif
467	{	878	{
468	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	879	rt_now = ev_time ();
469	/* time jump detected, adjust rtimers */	880
		881	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		882	{
		883	periodics_reschedule (EV_A);
		884
		885	/* adjust timers. this is easy, as the offset is the same for all */
470	for (i = 0; i < rtimercnt; ++i)	886	for (i = 0; i < timercnt; ++i)
471	rtimers [i]->at += ev_now - now;	887	timers [i]->at += rt_now - mn_now;
		888	}
472		889
473	now = ev_now;	890	mn_now = rt_now;
474	}	891	}
475	}	892	}
476		893
477	int ev_loop_done;	894	void
		895	ev_ref (EV_P)
		896	{
		897	++activecnt;
		898	}
478		899
		900	void
		901	ev_unref (EV_P)
		902	{
		903	--activecnt;
		904	}
		905
		906	static int loop_done;
		907
		908	void
479	void ev_loop (int flags)	909	ev_loop (EV_P_ int flags)
480	{	910	{
481	double block;	911	double block;
482	ev_loop_done = flags & EVLOOP_ONESHOT;	912	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
483
484	if (checkcnt)
485	{
486	queue_events ((W *)checks, checkcnt, EV_CHECK);
487	call_pending ();
488	}
489		913
490	do	914	do
491	{	915	{
		916	/* queue check watchers (and execute them) */
		917	if (expect_false (preparecnt))
		918	{
		919	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		920	call_pending (EV_A);
		921	}
		922
492	/* update fd-related kernel structures */	923	/* update fd-related kernel structures */
493	fd_reify ();	924	fd_reify (EV_A);
494		925
495	/* calculate blocking time */	926	/* calculate blocking time */
		927
		928	/* we only need this for !monotonic clockor timers, but as we basically
		929	always have timers, we just calculate it always */
		930	#if EV_USE_MONOTONIC
		931	if (expect_true (have_monotonic))
		932	time_update_monotonic (EV_A);
		933	else
		934	#endif
		935	{
		936	rt_now = ev_time ();
		937	mn_now = rt_now;
		938	}
		939
496	if (flags & EVLOOP_NONBLOCK || idlecnt)	940	if (flags & EVLOOP_NONBLOCK || idlecnt)
497	block = 0.;	941	block = 0.;
498	else	942	else
499	{	943	{
500	block = MAX_BLOCKTIME;	944	block = MAX_BLOCKTIME;
501		945
502	if (rtimercnt)	946	if (timercnt)
503	{	947	{
504	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	948	ev_tstamp to = timers [0]->at - mn_now + method_fudge;
505	if (block > to) block = to;	949	if (block > to) block = to;
506	}	950	}
507		951
508	if (atimercnt)	952	if (periodiccnt)
509	{	953	{
510	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	954	ev_tstamp to = periodics [0]->at - rt_now + method_fudge;
511	if (block > to) block = to;	955	if (block > to) block = to;
512	}	956	}
513		957
514	if (block < 0.) block = 0.;	958	if (block < 0.) block = 0.;
515	}	959	}
516		960
517	method_poll (block);	961	method_poll (EV_A_ block);
518		962
519	/* update ev_now, do magic */	963	/* update rt_now, do magic */
520	time_update ();	964	time_update (EV_A);
521		965
522	/* queue pending timers and reschedule them */	966	/* queue pending timers and reschedule them */
523	/* absolute timers first */	967	timers_reify (EV_A); /* relative timers called last */
524	timers_reify (atimers, atimercnt, ev_now);	968	periodics_reify (EV_A); /* absolute timers called first */
525	/* relative timers second */
526	timers_reify (rtimers, rtimercnt, now);
527		969
528	/* queue idle watchers unless io or timers are pending */	970	/* queue idle watchers unless io or timers are pending */
529	if (!pendingcnt)	971	if (!pendingcnt)
530	queue_events ((W *)idles, idlecnt, EV_IDLE);	972	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
531		973
532	/* queue check and possibly idle watchers */	974	/* queue check watchers, to be executed first */
		975	if (checkcnt)
533	queue_events ((W *)checks, checkcnt, EV_CHECK);	976	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
534		977
535	call_pending ();	978	call_pending (EV_A);
536	}	979	}
537	while (!ev_loop_done);	980	while (activecnt && !loop_done);
		981
		982	if (loop_done != 2)
		983	loop_done = 0;
		984	}
		985
		986	void
		987	ev_unloop (EV_P_ int how)
		988	{
		989	loop_done = how;
538	}	990	}
539		991
540	/*****************************************************************************/	992	/*****************************************************************************/
541		993
542	static void	994	inline void
543	wlist_add (WL *head, WL elem)	995	wlist_add (WL *head, WL elem)
544	{	996	{
545	elem->next = *head;	997	elem->next = *head;
546	*head = elem;	998	*head = elem;
547	}	999	}
548		1000
549	static void	1001	inline void
550	wlist_del (WL *head, WL elem)	1002	wlist_del (WL *head, WL elem)
551	{	1003	{
552	while (*head)	1004	while (*head)
553	{	1005	{
554	if (*head == elem)	1006	if (*head == elem)
…		…
559		1011
560	head = &(*head)->next;	1012	head = &(*head)->next;
561	}	1013	}
562	}	1014	}
563		1015
564	static void	1016	inline void
		1017	ev_clear_pending (EV_P_ W w)
		1018	{
		1019	if (w->pending)
		1020	{
		1021	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1022	w->pending = 0;
		1023	}
		1024	}
		1025
		1026	inline void
565	ev_start (W w, int active)	1027	ev_start (EV_P_ W w, int active)
566	{	1028	{
567	w->pending = 0;	1029	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1030	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1031
568	w->active = active;	1032	w->active = active;
		1033	ev_ref (EV_A);
569	}	1034	}
570		1035
571	static void	1036	inline void
572	ev_stop (W w)	1037	ev_stop (EV_P_ W w)
573	{	1038	{
574	if (w->pending)	1039	ev_unref (EV_A);
575	pendings [w->pending - 1].w = 0;
576
577	w->active = 0;	1040	w->active = 0;
578	/* nop */
579	}	1041	}
580		1042
581	/*****************************************************************************/	1043	/*****************************************************************************/
582		1044
583	void	1045	void
584	evio_start (struct ev_io *w)	1046	ev_io_start (EV_P_ struct ev_io *w)
585	{	1047	{
		1048	int fd = w->fd;
		1049
586	if (ev_is_active (w))	1050	if (ev_is_active (w))
587	return;	1051	return;
588		1052
589	int fd = w->fd;	1053	assert (("ev_io_start called with negative fd", fd >= 0));
590		1054
591	ev_start ((W)w, 1);	1055	ev_start (EV_A_ (W)w, 1);
592	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1056	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
593	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1057	wlist_add ((WL *)&anfds[fd].head, (WL)w);
594		1058
595	++fdchangecnt;	1059	fd_change (EV_A_ fd);
596	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
597	fdchanges [fdchangecnt - 1] = fd;
598	}	1060	}
599		1061
600	void	1062	void
601	evio_stop (struct ev_io *w)	1063	ev_io_stop (EV_P_ struct ev_io *w)
602	{	1064	{
		1065	ev_clear_pending (EV_A_ (W)w);
603	if (!ev_is_active (w))	1066	if (!ev_is_active (w))
604	return;	1067	return;
605		1068
606	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1069	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
607	ev_stop ((W)w);	1070	ev_stop (EV_A_ (W)w);
608		1071
609	++fdchangecnt;	1072	fd_change (EV_A_ w->fd);
610	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
611	fdchanges [fdchangecnt - 1] = w->fd;
612	}	1073	}
613		1074
614	void	1075	void
615	evtimer_start (struct ev_timer *w)	1076	ev_timer_start (EV_P_ struct ev_timer *w)
616	{	1077	{
617	if (ev_is_active (w))	1078	if (ev_is_active (w))
618	return;	1079	return;
619		1080
620	if (w->is_abs)	1081	w->at += mn_now;
		1082
		1083	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1084
		1085	ev_start (EV_A_ (W)w, ++timercnt);
		1086	array_needsize (timers, timermax, timercnt, );
		1087	timers [timercnt - 1] = w;
		1088	upheap ((WT *)timers, timercnt - 1);
		1089	}
		1090
		1091	void
		1092	ev_timer_stop (EV_P_ struct ev_timer *w)
		1093	{
		1094	ev_clear_pending (EV_A_ (W)w);
		1095	if (!ev_is_active (w))
		1096	return;
		1097
		1098	if (w->active < timercnt--)
		1099	{
		1100	timers [w->active - 1] = timers [timercnt];
		1101	downheap ((WT *)timers, timercnt, w->active - 1);
621	{	1102	}
622	/* this formula differs from the one in timer_reify becuse we do not round up */	1103
		1104	w->at = w->repeat;
		1105
		1106	ev_stop (EV_A_ (W)w);
		1107	}
		1108
		1109	void
		1110	ev_timer_again (EV_P_ struct ev_timer *w)
		1111	{
		1112	if (ev_is_active (w))
		1113	{
623	if (w->repeat)	1114	if (w->repeat)
624	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1115	{
625		1116	w->at = mn_now + w->repeat;
626	ev_start ((W)w, ++atimercnt);	1117	downheap ((WT *)timers, timercnt, w->active - 1);
627	array_needsize (atimers, atimermax, atimercnt, );	1118	}
628	atimers [atimercnt - 1] = w;
629	upheap (atimers, atimercnt - 1);
630	}
631	else	1119	else
		1120	ev_timer_stop (EV_A_ w);
632	{	1121	}
633	w->at += now;	1122	else if (w->repeat)
634		1123	ev_timer_start (EV_A_ w);
635	ev_start ((W)w, ++rtimercnt);
636	array_needsize (rtimers, rtimermax, rtimercnt, );
637	rtimers [rtimercnt - 1] = w;
638	upheap (rtimers, rtimercnt - 1);
639	}
640
641	}	1124	}
642		1125
643	void	1126	void
644	evtimer_stop (struct ev_timer *w)	1127	ev_periodic_start (EV_P_ struct ev_periodic *w)
645	{	1128	{
		1129	if (ev_is_active (w))
		1130	return;
		1131
		1132	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1133
		1134	/* this formula differs from the one in periodic_reify because we do not always round up */
		1135	if (w->interval)
		1136	w->at += ceil ((rt_now - w->at) / w->interval) * w->interval;
		1137
		1138	ev_start (EV_A_ (W)w, ++periodiccnt);
		1139	array_needsize (periodics, periodicmax, periodiccnt, );
		1140	periodics [periodiccnt - 1] = w;
		1141	upheap ((WT *)periodics, periodiccnt - 1);
		1142	}
		1143
		1144	void
		1145	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1146	{
		1147	ev_clear_pending (EV_A_ (W)w);
646	if (!ev_is_active (w))	1148	if (!ev_is_active (w))
647	return;	1149	return;
648		1150
649	if (w->is_abs)
650	{
651	if (w->active < atimercnt--)	1151	if (w->active < periodiccnt--)
652	{
653	atimers [w->active - 1] = atimers [atimercnt];
654	downheap (atimers, atimercnt, w->active - 1);
655	}
656	}	1152	{
657	else	1153	periodics [w->active - 1] = periodics [periodiccnt];
		1154	downheap ((WT *)periodics, periodiccnt, w->active - 1);
658	{	1155	}
659	if (w->active < rtimercnt--)
660	{
661	rtimers [w->active - 1] = rtimers [rtimercnt];
662	downheap (rtimers, rtimercnt, w->active - 1);
663	}
664	}
665		1156
666	ev_stop ((W)w);	1157	ev_stop (EV_A_ (W)w);
667	}	1158	}
668		1159
669	void	1160	void
670	evsignal_start (struct ev_signal *w)	1161	ev_idle_start (EV_P_ struct ev_idle *w)
671	{	1162	{
672	if (ev_is_active (w))	1163	if (ev_is_active (w))
673	return;	1164	return;
674		1165
		1166	ev_start (EV_A_ (W)w, ++idlecnt);
		1167	array_needsize (idles, idlemax, idlecnt, );
		1168	idles [idlecnt - 1] = w;
		1169	}
		1170
		1171	void
		1172	ev_idle_stop (EV_P_ struct ev_idle *w)
		1173	{
		1174	ev_clear_pending (EV_A_ (W)w);
		1175	if (ev_is_active (w))
		1176	return;
		1177
		1178	idles [w->active - 1] = idles [--idlecnt];
		1179	ev_stop (EV_A_ (W)w);
		1180	}
		1181
		1182	void
		1183	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1184	{
		1185	if (ev_is_active (w))
		1186	return;
		1187
		1188	ev_start (EV_A_ (W)w, ++preparecnt);
		1189	array_needsize (prepares, preparemax, preparecnt, );
		1190	prepares [preparecnt - 1] = w;
		1191	}
		1192
		1193	void
		1194	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1195	{
		1196	ev_clear_pending (EV_A_ (W)w);
		1197	if (ev_is_active (w))
		1198	return;
		1199
		1200	prepares [w->active - 1] = prepares [--preparecnt];
		1201	ev_stop (EV_A_ (W)w);
		1202	}
		1203
		1204	void
		1205	ev_check_start (EV_P_ struct ev_check *w)
		1206	{
		1207	if (ev_is_active (w))
		1208	return;
		1209
		1210	ev_start (EV_A_ (W)w, ++checkcnt);
		1211	array_needsize (checks, checkmax, checkcnt, );
		1212	checks [checkcnt - 1] = w;
		1213	}
		1214
		1215	void
		1216	ev_check_stop (EV_P_ struct ev_check *w)
		1217	{
		1218	ev_clear_pending (EV_A_ (W)w);
		1219	if (ev_is_active (w))
		1220	return;
		1221
		1222	checks [w->active - 1] = checks [--checkcnt];
		1223	ev_stop (EV_A_ (W)w);
		1224	}
		1225
		1226	#ifndef SA_RESTART
		1227	# define SA_RESTART 0
		1228	#endif
		1229
		1230	void
		1231	ev_signal_start (EV_P_ struct ev_signal *w)
		1232	{
		1233	#if EV_MULTIPLICITY
		1234	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1235	#endif
		1236	if (ev_is_active (w))
		1237	return;
		1238
		1239	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1240
675	ev_start ((W)w, 1);	1241	ev_start (EV_A_ (W)w, 1);
676	array_needsize (signals, signalmax, w->signum, signals_init);	1242	array_needsize (signals, signalmax, w->signum, signals_init);
677	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1243	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
678		1244
679	if (!w->next)	1245	if (!w->next)
680	{	1246	{
681	struct sigaction sa;	1247	struct sigaction sa;
682	sa.sa_handler = sighandler;	1248	sa.sa_handler = sighandler;
683	sigfillset (&sa.sa_mask);	1249	sigfillset (&sa.sa_mask);
684	sa.sa_flags = 0;	1250	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
685	sigaction (w->signum, &sa, 0);	1251	sigaction (w->signum, &sa, 0);
686	}	1252	}
687	}	1253	}
688		1254
689	void	1255	void
690	evsignal_stop (struct ev_signal *w)	1256	ev_signal_stop (EV_P_ struct ev_signal *w)
691	{	1257	{
		1258	ev_clear_pending (EV_A_ (W)w);
692	if (!ev_is_active (w))	1259	if (!ev_is_active (w))
693	return;	1260	return;
694		1261
695	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1262	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
696	ev_stop ((W)w);	1263	ev_stop (EV_A_ (W)w);
697		1264
698	if (!signals [w->signum - 1].head)	1265	if (!signals [w->signum - 1].head)
699	signal (w->signum, SIG_DFL);	1266	signal (w->signum, SIG_DFL);
700	}	1267	}
701		1268
702	void evidle_start (struct ev_idle *w)	1269	void
		1270	ev_child_start (EV_P_ struct ev_child *w)
703	{	1271	{
		1272	#if EV_MULTIPLICITY
		1273	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1274	#endif
704	if (ev_is_active (w))	1275	if (ev_is_active (w))
705	return;	1276	return;
706		1277
707	ev_start ((W)w, ++idlecnt);	1278	ev_start (EV_A_ (W)w, 1);
708	array_needsize (idles, idlemax, idlecnt, );	1279	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
709	idles [idlecnt - 1] = w;
710	}	1280	}
711		1281
712	void evidle_stop (struct ev_idle *w)	1282	void
		1283	ev_child_stop (EV_P_ struct ev_child *w)
713	{	1284	{
714	idles [w->active - 1] = idles [--idlecnt];	1285	ev_clear_pending (EV_A_ (W)w);
715	ev_stop ((W)w);
716	}
717
718	void evcheck_start (struct ev_check *w)
719	{
720	if (ev_is_active (w))	1286	if (ev_is_active (w))
721	return;	1287	return;
722		1288
723	ev_start ((W)w, ++checkcnt);	1289	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
724	array_needsize (checks, checkmax, checkcnt, );
725	checks [checkcnt - 1] = w;
726	}
727
728	void evcheck_stop (struct ev_check *w)
729	{
730	checks [w->active - 1] = checks [--checkcnt];
731	ev_stop ((W)w);	1290	ev_stop (EV_A_ (W)w);
732	}	1291	}
733		1292
734	/*****************************************************************************/	1293	/*****************************************************************************/
735		1294
736	#if 0	1295	struct ev_once
737
738	static void
739	sin_cb (struct ev_io *w, int revents)
740	{	1296	{
741	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
742	}
743
744	static void
745	ocb (struct ev_timer *w, int revents)
746	{
747	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
748	evtimer_stop (w);
749	evtimer_start (w);
750	}
751
752	static void
753	scb (struct ev_signal *w, int revents)
754	{
755	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
756	}
757
758	static void
759	gcb (struct ev_signal *w, int revents)
760	{
761	fprintf (stderr, "generic %x\n", revents);
762	}
763
764	int main (void)
765	{
766	struct ev_io sin;	1297	struct ev_io io;
767
768	ev_init (0);
769
770	evw_init (&sin, sin_cb, 55);
771	evio_set (&sin, 0, EV_READ);
772	evio_start (&sin);
773
774	struct ev_timer t[10000];
775
776	#if 0
777	int i;
778	for (i = 0; i < 10000; ++i)
779	{
780	struct ev_timer *w = t + i;
781	evw_init (w, ocb, i);
782	evtimer_set_abs (w, drand48 (), 0.99775533);
783	evtimer_start (w);
784	if (drand48 () < 0.5)
785	evtimer_stop (w);
786	}
787	#endif
788
789	struct ev_timer t1;	1298	struct ev_timer to;
790	evw_init (&t1, ocb, 0);	1299	void (*cb)(int revents, void *arg);
791	evtimer_set_abs (&t1, 5, 10);	1300	void *arg;
792	evtimer_start (&t1);	1301	};
793		1302
794	struct ev_signal sig;	1303	static void
795	evw_init (&sig, scb, 65535);	1304	once_cb (EV_P_ struct ev_once *once, int revents)
796	evsignal_set (&sig, SIGQUIT);	1305	{
797	evsignal_start (&sig);	1306	void (*cb)(int revents, void *arg) = once->cb;
		1307	void *arg = once->arg;
798		1308
799	struct ev_check cw;	1309	ev_io_stop (EV_A_ &once->io);
800	evw_init (&cw, gcb, 0);	1310	ev_timer_stop (EV_A_ &once->to);
801	evcheck_start (&cw);	1311	free (once);
802		1312
803	struct ev_idle iw;	1313	cb (revents, arg);
804	evw_init (&iw, gcb, 0);
805	evidle_start (&iw);
806
807	ev_loop (0);
808
809	return 0;
810	}	1314	}
811		1315
812	#endif	1316	static void
		1317	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1318	{
		1319	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1320	}
813		1321
		1322	static void
		1323	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1324	{
		1325	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1326	}
814		1327
		1328	void
		1329	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1330	{
		1331	struct ev_once *once = malloc (sizeof (struct ev_once));
815		1332
		1333	if (!once)
		1334	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1335	else
		1336	{
		1337	once->cb = cb;
		1338	once->arg = arg;
816		1339
		1340	ev_watcher_init (&once->io, once_cb_io);
		1341	if (fd >= 0)
		1342	{
		1343	ev_io_set (&once->io, fd, events);
		1344	ev_io_start (EV_A_ &once->io);
		1345	}
		1346
		1347	ev_watcher_init (&once->to, once_cb_to);
		1348	if (timeout >= 0.)
		1349	{
		1350	ev_timer_set (&once->to, timeout, 0.);
		1351	ev_timer_start (EV_A_ &once->to);
		1352	}
		1353	}
		1354	}
		1355

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