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Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.68 by root, Mon Nov 5 20:19:00 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#ifndef EV_STANDALONE
		32	# include "config.h"
		33
		34	# if HAVE_CLOCK_GETTIME
		35	# define EV_USE_MONOTONIC 1
		36	# define EV_USE_REALTIME 1
		37	# endif
		38
		39	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		40	# define EV_USE_SELECT 1
		41	# endif
		42
		43	# if HAVE_POLL && HAVE_POLL_H
		44	# define EV_USE_POLL 1
		45	# endif
		46
		47	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		48	# define EV_USE_EPOLL 1
		49	# endif
		50
		51	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		52	# define EV_USE_KQUEUE 1
		53	# endif
		54
		55	#endif
		56
1	#include <math.h>	57	#include <math.h>
2	#include <stdlib.h>	58	#include <stdlib.h>
3	#include <unistd.h>	59	#include <unistd.h>
4	#include <fcntl.h>	60	#include <fcntl.h>
5	#include <signal.h>	61	#include <signal.h>
		62	#include <stddef.h>
6		63
7	#include <stdio.h>	64	#include <stdio.h>
8		65
9	#include <assert.h>	66	#include <assert.h>
10	#include <errno.h>	67	#include <errno.h>
		68	#include <sys/types.h>
		69	#ifndef WIN32
		70	# include <sys/wait.h>
		71	#endif
11	#include <sys/time.h>	72	#include <sys/time.h>
12	#include <time.h>	73	#include <time.h>
13		74
		75	/**/
		76
		77	#ifndef EV_USE_MONOTONIC
		78	# define EV_USE_MONOTONIC 1
		79	#endif
		80
		81	#ifndef EV_USE_SELECT
		82	# define EV_USE_SELECT 1
		83	#endif
		84
		85	#ifndef EV_USE_POLL
		86	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		87	#endif
		88
		89	#ifndef EV_USE_EPOLL
		90	# define EV_USE_EPOLL 0
		91	#endif
		92
		93	#ifndef EV_USE_KQUEUE
		94	# define EV_USE_KQUEUE 0
		95	#endif
		96
		97	#ifndef EV_USE_WIN32
		98	# ifdef WIN32
		99	# define EV_USE_WIN32 1
		100	# else
		101	# define EV_USE_WIN32 0
		102	# endif
		103	#endif
		104
		105	#ifndef EV_USE_REALTIME
		106	# define EV_USE_REALTIME 1
		107	#endif
		108
		109	/**/
		110
14	#ifdef CLOCK_MONOTONIC	111	#ifndef CLOCK_MONOTONIC
		112	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	113	# define EV_USE_MONOTONIC 0
16	#endif	114	#endif
17		115
		116	#ifndef CLOCK_REALTIME
		117	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	118	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	119	#endif
20	#define HAVE_SELECT 1	120
		121	/**/
21		122
22	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	123	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	#define MAX_BLOCKTIME 60.	124	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		125	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		126	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
24		127
25	#include "ev.h"	128	#include "ev.h"
26		129
		130	#if __GNUC__ >= 3
		131	# define expect(expr,value) __builtin_expect ((expr),(value))
		132	# define inline inline
		133	#else
		134	# define expect(expr,value) (expr)
		135	# define inline static
		136	#endif
		137
		138	#define expect_false(expr) expect ((expr) != 0, 0)
		139	#define expect_true(expr) expect ((expr) != 0, 1)
		140
		141	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		142	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		143
27	struct ev_watcher {	144	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);	145	typedef struct ev_watcher_list *WL;
		146	typedef struct ev_watcher_time *WT;
		147
		148	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		149
		150	#if WIN32
		151	/* note: the comment below could not be substantiated, but what would I care */
		152	/* MSDN says this is required to handle SIGFPE */
		153	volatile double SIGFPE_REQ = 0.0f;
		154	#endif
		155
		156	/*****************************************************************************/
		157
		158	typedef struct
		159	{
		160	WL head;
		161	unsigned char events;
		162	unsigned char reify;
		163	} ANFD;
		164
		165	typedef struct
		166	{
		167	W w;
		168	int events;
		169	} ANPENDING;
		170
		171	#if EV_MULTIPLICITY
		172
		173	struct ev_loop
		174	{
		175	# define VAR(name,decl) decl;
		176	# include "ev_vars.h"
29	};	177	};
		178	# undef VAR
		179	# include "ev_wrap.h"
30		180
31	struct ev_watcher_list {	181	#else
32	EV_WATCHER_LIST (ev_watcher_list);
33	};
34		182
35	static ev_tstamp now, diff; /* monotonic clock */	183	# define VAR(name,decl) static decl;
36	ev_tstamp ev_now;	184	# include "ev_vars.h"
37	int ev_method;	185	# undef VAR
38		186
39	static int have_monotonic; /* runtime */	187	#endif
40		188
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	189	/*****************************************************************************/
42	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);
44		190
45	ev_tstamp	191	inline ev_tstamp
46	ev_time (void)	192	ev_time (void)
47	{	193	{
48	#if HAVE_REALTIME	194	#if EV_USE_REALTIME
49	struct timespec ts;	195	struct timespec ts;
50	clock_gettime (CLOCK_REALTIME, &ts);	196	clock_gettime (CLOCK_REALTIME, &ts);
51	return ts.tv_sec + ts.tv_nsec * 1e-9;	197	return ts.tv_sec + ts.tv_nsec * 1e-9;
52	#else	198	#else
53	struct timeval tv;	199	struct timeval tv;
54	gettimeofday (&tv, 0);	200	gettimeofday (&tv, 0);
55	return tv.tv_sec + tv.tv_usec * 1e-6;	201	return tv.tv_sec + tv.tv_usec * 1e-6;
56	#endif	202	#endif
57	}	203	}
58		204
59	static ev_tstamp	205	inline ev_tstamp
60	get_clock (void)	206	get_clock (void)
61	{	207	{
62	#if HAVE_MONOTONIC	208	#if EV_USE_MONOTONIC
63	if (have_monotonic)	209	if (expect_true (have_monotonic))
64	{	210	{
65	struct timespec ts;	211	struct timespec ts;
66	clock_gettime (CLOCK_MONOTONIC, &ts);	212	clock_gettime (CLOCK_MONOTONIC, &ts);
67	return ts.tv_sec + ts.tv_nsec * 1e-9;	213	return ts.tv_sec + ts.tv_nsec * 1e-9;
68	}	214	}
69	#endif	215	#endif
70		216
71	return ev_time ();	217	return ev_time ();
72	}	218	}
73		219
		220	ev_tstamp
		221	ev_now (EV_P)
		222	{
		223	return rt_now;
		224	}
		225
		226	#define array_roundsize(base,n) ((n) | 4 & ~3)
		227
74	#define array_needsize(base,cur,cnt,init) \	228	#define array_needsize(base,cur,cnt,init) \
75	if ((cnt) > cur) \	229	if (expect_false ((cnt) > cur)) \
76	{ \	230	{ \
77	int newcnt = cur ? cur << 1 : 16; \	231	int newcnt = cur; \
78	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	232	do \
		233	{ \
		234	newcnt = array_roundsize (base, newcnt << 1); \
		235	} \
		236	while ((cnt) > newcnt); \
		237	\
79	base = realloc (base, sizeof (*base) * (newcnt)); \	238	base = realloc (base, sizeof (*base) * (newcnt)); \
80	init (base + cur, newcnt - cur); \	239	init (base + cur, newcnt - cur); \
81	cur = newcnt; \	240	cur = newcnt; \
82	}	241	}
83		242
84	typedef struct	243	#define array_slim(stem) \
85	{	244	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
86	struct ev_io *head;	245	{ \
87	unsigned char wev, rev; /* want, received event set */	246	stem ## max = array_roundsize (stem ## cnt >> 1); \
88	} ANFD;	247	base = realloc (base, sizeof (*base) * (stem ## max)); \
		248	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		249	}
89		250
90	static ANFD *anfds;	251	#define array_free(stem, idx) \
91	static int anfdmax;	252	free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
92		253
93	static int *fdchanges;	254	/*****************************************************************************/
94	static int fdchangemax, fdchangecnt;
95		255
96	static void	256	static void
97	anfds_init (ANFD *base, int count)	257	anfds_init (ANFD *base, int count)
98	{	258	{
99	while (count--)	259	while (count--)
100	{	260	{
101	base->head = 0;	261	base->head = 0;
102	base->wev = base->rev = EV_NONE;	262	base->events = EV_NONE;
		263	base->reify = 0;
		264
103	++base;	265	++base;
104	}	266	}
105	}	267	}
106		268
107	typedef struct
108	{
109	struct ev_watcher *w;
110	int events;
111	} ANPENDING;
112
113	static ANPENDING *pendings;
114	static int pendingmax, pendingcnt;
115
116	static void	269	static void
117	event (struct ev_watcher *w, int events)	270	event (EV_P_ W w, int events)
118	{	271	{
		272	if (w->pending)
		273	{
		274	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		275	return;
		276	}
		277
119	w->pending = ++pendingcnt;	278	w->pending = ++pendingcnt [ABSPRI (w)];
120	array_needsize (pendings, pendingmax, pendingcnt, );	279	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
121	pendings [pendingcnt - 1].w = w;	280	pendings [ABSPRI (w)][w->pending - 1].w = w;
122	pendings [pendingcnt - 1].events = events;	281	pendings [ABSPRI (w)][w->pending - 1].events = events;
123	}	282	}
124		283
125	static void	284	static void
		285	queue_events (EV_P_ W *events, int eventcnt, int type)
		286	{
		287	int i;
		288
		289	for (i = 0; i < eventcnt; ++i)
		290	event (EV_A_ events [i], type);
		291	}
		292
		293	static void
126	fd_event (int fd, int events)	294	fd_event (EV_P_ int fd, int events)
127	{	295	{
128	ANFD *anfd = anfds + fd;	296	ANFD *anfd = anfds + fd;
129	struct ev_io *w;	297	struct ev_io *w;
130		298
131	for (w = anfd->head; w; w = w->next)	299	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
132	{	300	{
133	int ev = w->events & events;	301	int ev = w->events & events;
134		302
135	if (ev)	303	if (ev)
136	event ((struct ev_watcher *)w, ev);	304	event (EV_A_ (W)w, ev);
		305	}
		306	}
		307
		308	/*****************************************************************************/
		309
		310	static void
		311	fd_reify (EV_P)
		312	{
		313	int i;
		314
		315	for (i = 0; i < fdchangecnt; ++i)
		316	{
		317	int fd = fdchanges [i];
		318	ANFD *anfd = anfds + fd;
		319	struct ev_io *w;
		320
		321	int events = 0;
		322
		323	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		324	events |= w->events;
		325
		326	anfd->reify = 0;
		327
		328	method_modify (EV_A_ fd, anfd->events, events);
		329	anfd->events = events;
		330	}
		331
		332	fdchangecnt = 0;
		333	}
		334
		335	static void
		336	fd_change (EV_P_ int fd)
		337	{
		338	if (anfds [fd].reify || fdchangecnt < 0)
		339	return;
		340
		341	anfds [fd].reify = 1;
		342
		343	++fdchangecnt;
		344	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		345	fdchanges [fdchangecnt - 1] = fd;
		346	}
		347
		348	static void
		349	fd_kill (EV_P_ int fd)
		350	{
		351	struct ev_io *w;
		352
		353	while ((w = (struct ev_io *)anfds [fd].head))
		354	{
		355	ev_io_stop (EV_A_ w);
		356	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		357	}
		358	}
		359
		360	/* called on EBADF to verify fds */
		361	static void
		362	fd_ebadf (EV_P)
		363	{
		364	int fd;
		365
		366	for (fd = 0; fd < anfdmax; ++fd)
		367	if (anfds [fd].events)
		368	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		369	fd_kill (EV_A_ fd);
		370	}
		371
		372	/* called on ENOMEM in select/poll to kill some fds and retry */
		373	static void
		374	fd_enomem (EV_P)
		375	{
		376	int fd;
		377
		378	for (fd = anfdmax; fd--; )
		379	if (anfds [fd].events)
		380	{
		381	fd_kill (EV_A_ fd);
		382	return;
137	}	383	}
138	}	384	}
139		385
140	static struct ev_timer **atimers;	386	/* susually called after fork if method needs to re-arm all fds from scratch */
141	static int atimermax, atimercnt;
142
143	static struct ev_timer **rtimers;
144	static int rtimermax, rtimercnt;
145
146	static void	387	static void
147	upheap (struct ev_timer **timers, int k)	388	fd_rearm_all (EV_P)
148	{	389	{
149	struct ev_timer *w = timers [k];	390	int fd;
150		391
		392	/* this should be highly optimised to not do anything but set a flag */
		393	for (fd = 0; fd < anfdmax; ++fd)
		394	if (anfds [fd].events)
		395	{
		396	anfds [fd].events = 0;
		397	fd_change (EV_A_ fd);
		398	}
		399	}
		400
		401	/*****************************************************************************/
		402
		403	static void
		404	upheap (WT *heap, int k)
		405	{
		406	WT w = heap [k];
		407
151	while (k && timers [k >> 1]->at > w->at)	408	while (k && heap [k >> 1]->at > w->at)
152	{	409	{
153	timers [k] = timers [k >> 1];	410	heap [k] = heap [k >> 1];
154	timers [k]->active = k + 1;	411	((W)heap [k])->active = k + 1;
155	k >>= 1;	412	k >>= 1;
156	}	413	}
157		414
158	timers [k] = w;	415	heap [k] = w;
159	timers [k]->active = k + 1;	416	((W)heap [k])->active = k + 1;
160		417
161	}	418	}
162		419
163	static void	420	static void
164	downheap (struct ev_timer **timers, int N, int k)	421	downheap (WT *heap, int N, int k)
165	{	422	{
166	struct ev_timer *w = timers [k];	423	WT w = heap [k];
167		424
168	while (k < (N >> 1))	425	while (k < (N >> 1))
169	{	426	{
170	int j = k << 1;	427	int j = k << 1;
171		428
172	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	429	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
173	++j;	430	++j;
174		431
175	if (w->at <= timers [j]->at)	432	if (w->at <= heap [j]->at)
176	break;	433	break;
177		434
178	timers [k] = timers [j];	435	heap [k] = heap [j];
179	timers [k]->active = k + 1;	436	((W)heap [k])->active = k + 1;
180	k = j;	437	k = j;
181	}	438	}
182		439
183	timers [k] = w;	440	heap [k] = w;
184	timers [k]->active = k + 1;	441	((W)heap [k])->active = k + 1;
185	}	442	}
		443
		444	/*****************************************************************************/
186		445
187	typedef struct	446	typedef struct
188	{	447	{
189	struct ev_signal *head;	448	WL head;
190	sig_atomic_t gotsig;	449	sig_atomic_t volatile gotsig;
191	} ANSIG;	450	} ANSIG;
192		451
193	static ANSIG *signals;	452	static ANSIG *signals;
194	static int signalmax;	453	static int signalmax;
195		454
196	static int sigpipe [2];	455	static int sigpipe [2];
197	static sig_atomic_t gotsig;	456	static sig_atomic_t volatile gotsig;
198	static struct ev_io sigev;	457	static struct ev_io sigev;
199		458
200	static void	459	static void
201	signals_init (ANSIG *base, int count)	460	signals_init (ANSIG *base, int count)
202	{	461	{
203	while (count--)	462	while (count--)
204	{	463	{
205	base->head = 0;	464	base->head = 0;
206	base->gotsig = 0;	465	base->gotsig = 0;
		466
207	++base;	467	++base;
208	}	468	}
209	}	469	}
210		470
211	static void	471	static void
212	sighandler (int signum)	472	sighandler (int signum)
213	{	473	{
		474	#if WIN32
		475	signal (signum, sighandler);
		476	#endif
		477
214	signals [signum - 1].gotsig = 1;	478	signals [signum - 1].gotsig = 1;
215		479
216	if (!gotsig)	480	if (!gotsig)
217	{	481	{
		482	int old_errno = errno;
218	gotsig = 1;	483	gotsig = 1;
219	write (sigpipe [1], &gotsig, 1);	484	write (sigpipe [1], &signum, 1);
		485	errno = old_errno;
220	}	486	}
221	}	487	}
222		488
223	static void	489	static void
224	sigcb (struct ev_io *iow, int revents)	490	sigcb (EV_P_ struct ev_io *iow, int revents)
225	{	491	{
226	struct ev_signal *w;	492	WL w;
227	int sig;	493	int signum;
228		494
		495	read (sigpipe [0], &revents, 1);
229	gotsig = 0;	496	gotsig = 0;
230	read (sigpipe [0], &revents, 1);
231		497
232	for (sig = signalmax; sig--; )	498	for (signum = signalmax; signum--; )
233	if (signals [sig].gotsig)	499	if (signals [signum].gotsig)
234	{	500	{
235	signals [sig].gotsig = 0;	501	signals [signum].gotsig = 0;
236		502
237	for (w = signals [sig].head; w; w = w->next)	503	for (w = signals [signum].head; w; w = w->next)
238	event ((struct ev_watcher *)w, EV_SIGNAL);	504	event (EV_A_ (W)w, EV_SIGNAL);
239	}	505	}
240	}	506	}
241		507
242	static void	508	static void
243	siginit (void)	509	siginit (EV_P)
244	{	510	{
		511	#ifndef WIN32
245	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	512	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
246	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	513	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
247		514
248	/* rather than sort out wether we really need nb, set it */	515	/* rather than sort out wether we really need nb, set it */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	516	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	517	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		518	#endif
251		519
252	evio_set (&sigev, sigpipe [0], EV_READ);	520	ev_io_set (&sigev, sigpipe [0], EV_READ);
253	evio_start (&sigev);	521	ev_io_start (EV_A_ &sigev);
		522	ev_unref (EV_A); /* child watcher should not keep loop alive */
254	}	523	}
255		524
		525	/*****************************************************************************/
		526
		527	#ifndef WIN32
		528
		529	static struct ev_child *childs [PID_HASHSIZE];
		530	static struct ev_signal childev;
		531
		532	#ifndef WCONTINUED
		533	# define WCONTINUED 0
		534	#endif
		535
		536	static void
		537	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		538	{
		539	struct ev_child *w;
		540
		541	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		542	if (w->pid == pid || !w->pid)
		543	{
		544	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		545	w->rpid = pid;
		546	w->rstatus = status;
		547	event (EV_A_ (W)w, EV_CHILD);
		548	}
		549	}
		550
		551	static void
		552	childcb (EV_P_ struct ev_signal *sw, int revents)
		553	{
		554	int pid, status;
		555
		556	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		557	{
		558	/* make sure we are called again until all childs have been reaped */
		559	event (EV_A_ (W)sw, EV_SIGNAL);
		560
		561	child_reap (EV_A_ sw, pid, pid, status);
		562	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		563	}
		564	}
		565
		566	#endif
		567
		568	/*****************************************************************************/
		569
		570	#if EV_USE_KQUEUE
		571	# include "ev_kqueue.c"
		572	#endif
256	#if HAVE_EPOLL	573	#if EV_USE_EPOLL
257	# include "ev_epoll.c"	574	# include "ev_epoll.c"
258	#endif	575	#endif
		576	#if EV_USE_POLL
		577	# include "ev_poll.c"
		578	#endif
259	#if HAVE_SELECT	579	#if EV_USE_SELECT
260	# include "ev_select.c"	580	# include "ev_select.c"
261	#endif	581	#endif
262		582
263	int ev_init (int flags)	583	int
		584	ev_version_major (void)
264	{	585	{
		586	return EV_VERSION_MAJOR;
		587	}
		588
		589	int
		590	ev_version_minor (void)
		591	{
		592	return EV_VERSION_MINOR;
		593	}
		594
		595	/* return true if we are running with elevated privileges and should ignore env variables */
		596	static int
		597	enable_secure (void)
		598	{
		599	#ifdef WIN32
		600	return 0;
		601	#else
		602	return getuid () != geteuid ()
		603	|| getgid () != getegid ();
		604	#endif
		605	}
		606
		607	int
		608	ev_method (EV_P)
		609	{
		610	return method;
		611	}
		612
		613	static void
		614	loop_init (EV_P_ int methods)
		615	{
		616	if (!method)
		617	{
265	#if HAVE_MONOTONIC	618	#if EV_USE_MONOTONIC
266	{	619	{
267	struct timespec ts;	620	struct timespec ts;
268	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	621	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269	have_monotonic = 1;	622	have_monotonic = 1;
270	}	623	}
271	#endif	624	#endif
272		625
273	ev_now = ev_time ();	626	rt_now = ev_time ();
274	now = get_clock ();	627	mn_now = get_clock ();
275	diff = ev_now - now;	628	now_floor = mn_now;
		629	rtmn_diff = rt_now - mn_now;
276		630
		631	if (methods == EVMETHOD_AUTO)
		632	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		633	methods = atoi (getenv ("LIBEV_METHODS"));
		634	else
		635	methods = EVMETHOD_ANY;
		636
		637	method = 0;
		638	#if EV_USE_WIN32
		639	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		640	#endif
		641	#if EV_USE_KQUEUE
		642	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		643	#endif
		644	#if EV_USE_EPOLL
		645	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		646	#endif
		647	#if EV_USE_POLL
		648	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		649	#endif
		650	#if EV_USE_SELECT
		651	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		652	#endif
		653	}
		654	}
		655
		656	void
		657	loop_destroy (EV_P)
		658	{
		659	int i;
		660
		661	#if EV_USE_WIN32
		662	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		663	#endif
		664	#if EV_USE_KQUEUE
		665	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		666	#endif
		667	#if EV_USE_EPOLL
		668	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		669	#endif
		670	#if EV_USE_POLL
		671	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		672	#endif
		673	#if EV_USE_SELECT
		674	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		675	#endif
		676
		677	for (i = NUMPRI; i--; )
		678	array_free (pending, [i]);
		679
		680	array_free (fdchange, );
		681	array_free (timer, );
		682	array_free (periodic, );
		683	array_free (idle, );
		684	array_free (prepare, );
		685	array_free (check, );
		686
		687	method = 0;
		688	/*TODO*/
		689	}
		690
		691	void
		692	loop_fork (EV_P)
		693	{
		694	/*TODO*/
		695	#if EV_USE_EPOLL
		696	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		697	#endif
		698	#if EV_USE_KQUEUE
		699	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		700	#endif
		701	}
		702
		703	#if EV_MULTIPLICITY
		704	struct ev_loop *
		705	ev_loop_new (int methods)
		706	{
		707	struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop));
		708
		709	loop_init (EV_A_ methods);
		710
		711	if (ev_method (EV_A))
		712	return loop;
		713
		714	return 0;
		715	}
		716
		717	void
		718	ev_loop_destroy (EV_P)
		719	{
		720	loop_destroy (EV_A);
		721	free (loop);
		722	}
		723
		724	void
		725	ev_loop_fork (EV_P)
		726	{
		727	loop_fork (EV_A);
		728	}
		729
		730	#endif
		731
		732	#if EV_MULTIPLICITY
		733	struct ev_loop default_loop_struct;
		734	static struct ev_loop *default_loop;
		735
		736	struct ev_loop *
		737	#else
		738	static int default_loop;
		739
		740	int
		741	#endif
		742	ev_default_loop (int methods)
		743	{
		744	if (sigpipe [0] == sigpipe [1])
277	if (pipe (sigpipe))	745	if (pipe (sigpipe))
278	return 0;	746	return 0;
279		747
280	ev_method = EVMETHOD_NONE;	748	if (!default_loop)
281	#if HAVE_EPOLL
282	if (ev_method == EVMETHOD_NONE) epoll_init (flags);
283	#endif
284	#if HAVE_SELECT
285	if (ev_method == EVMETHOD_NONE) select_init (flags);
286	#endif
287
288	if (ev_method)
289	{	749	{
		750	#if EV_MULTIPLICITY
		751	struct ev_loop *loop = default_loop = &default_loop_struct;
		752	#else
		753	default_loop = 1;
		754	#endif
		755
		756	loop_init (EV_A_ methods);
		757
		758	if (ev_method (EV_A))
		759	{
290	evw_init (&sigev, sigcb, 0);	760	ev_watcher_init (&sigev, sigcb);
		761	ev_set_priority (&sigev, EV_MAXPRI);
291	siginit ();	762	siginit (EV_A);
292	}
293		763
294	return ev_method;	764	#ifndef WIN32
295	}	765	ev_signal_init (&childev, childcb, SIGCHLD);
296		766	ev_set_priority (&childev, EV_MAXPRI);
297	void ev_prefork (void)	767	ev_signal_start (EV_A_ &childev);
298	{	768	ev_unref (EV_A); /* child watcher should not keep loop alive */
299	}
300
301	void ev_postfork_parent (void)
302	{
303	}
304
305	void ev_postfork_child (void)
306	{
307	#if HAVE_EPOLL
308	if (ev_method == EVMETHOD_EPOLL)
309	epoll_postfork_child ();
310	#endif	769	#endif
		770	}
		771	else
		772	default_loop = 0;
		773	}
311		774
		775	return default_loop;
		776	}
		777
		778	void
		779	ev_default_destroy (void)
		780	{
		781	#if EV_MULTIPLICITY
		782	struct ev_loop *loop = default_loop;
		783	#endif
		784
		785	ev_ref (EV_A); /* child watcher */
		786	ev_signal_stop (EV_A_ &childev);
		787
		788	ev_ref (EV_A); /* signal watcher */
312	evio_stop (&sigev);	789	ev_io_stop (EV_A_ &sigev);
		790
		791	close (sigpipe [0]); sigpipe [0] = 0;
		792	close (sigpipe [1]); sigpipe [1] = 0;
		793
		794	loop_destroy (EV_A);
		795	}
		796
		797	void
		798	ev_default_fork (void)
		799	{
		800	#if EV_MULTIPLICITY
		801	struct ev_loop *loop = default_loop;
		802	#endif
		803
		804	loop_fork (EV_A);
		805
		806	ev_io_stop (EV_A_ &sigev);
313	close (sigpipe [0]);	807	close (sigpipe [0]);
314	close (sigpipe [1]);	808	close (sigpipe [1]);
315	pipe (sigpipe);	809	pipe (sigpipe);
		810
		811	ev_ref (EV_A); /* signal watcher */
316	siginit ();	812	siginit (EV_A);
317	}	813	}
318		814
		815	/*****************************************************************************/
		816
319	static void	817	static void
320	fd_reify (void)	818	call_pending (EV_P)
321	{	819	{
322	int i;	820	int pri;
323		821
324	for (i = 0; i < fdchangecnt; ++i)	822	for (pri = NUMPRI; pri--; )
325	{	823	while (pendingcnt [pri])
326	int fd = fdchanges [i];
327	ANFD *anfd = anfds + fd;
328	struct ev_io *w;
329
330	int wev = 0;
331
332	for (w = anfd->head; w; w = w->next)
333	wev |= w->events;
334
335	if (anfd->wev != wev)
336	{	824	{
337	method_modify (fd, anfd->wev, wev);	825	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
338	anfd->wev = wev;
339	}
340	}
341		826
342	fdchangecnt = 0;
343	}
344
345	static void
346	call_pending ()
347	{
348	int i;
349
350	for (i = 0; i < pendingcnt; ++i)
351	{
352	ANPENDING *p = pendings + i;
353
354	if (p->w)	827	if (p->w)
355	{	828	{
356	p->w->pending = 0;	829	p->w->pending = 0;
357	p->w->cb (p->w, p->events);	830	p->w->cb (EV_A_ p->w, p->events);
358	}	831	}
359	}	832	}
360
361	pendingcnt = 0;
362	}	833	}
363		834
364	static void	835	static void
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	836	timers_reify (EV_P)
366	{	837	{
367	while (timercnt && timers [0]->at <= now)	838	while (timercnt && ((WT)timers [0])->at <= mn_now)
368	{	839	{
369	struct ev_timer *w = timers [0];	840	struct ev_timer *w = timers [0];
		841
		842	assert (("inactive timer on timer heap detected", ev_is_active (w)));
370		843
371	/* first reschedule or stop timer */	844	/* first reschedule or stop timer */
372	if (w->repeat)	845	if (w->repeat)
373	{	846	{
374	if (w->is_abs)	847	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
375	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
376	else
377	w->at = now + w->repeat;	848	((WT)w)->at = mn_now + w->repeat;
378
379	assert (w->at > now);
380
381	downheap (timers, timercnt, 0);	849	downheap ((WT *)timers, timercnt, 0);
382	}	850	}
383	else	851	else
		852	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		853
		854	event (EV_A_ (W)w, EV_TIMEOUT);
		855	}
		856	}
		857
		858	static void
		859	periodics_reify (EV_P)
		860	{
		861	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		862	{
		863	struct ev_periodic *w = periodics [0];
		864
		865	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		866
		867	/* first reschedule or stop timer */
		868	if (w->interval)
384	{	869	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	870	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
386	--timercnt; /* maybe pass by reference instead? */	871	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		872	downheap ((WT *)periodics, periodiccnt, 0);
387	}	873	}
		874	else
		875	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
388		876
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	877	event (EV_A_ (W)w, EV_PERIODIC);
390	}	878	}
391	}	879	}
392		880
393	static void	881	static void
394	time_update ()	882	periodics_reschedule (EV_P)
395	{	883	{
396	int i;	884	int i;
397	ev_now = ev_time ();
398		885
399	if (have_monotonic)	886	/* adjust periodics after time jump */
		887	for (i = 0; i < periodiccnt; ++i)
400	{	888	{
401	ev_tstamp odiff = diff;	889	struct ev_periodic *w = periodics [i];
402		890
403	/* detecting time jumps is much more difficult */	891	if (w->interval)
404	for (i = 2; --i; ) /* loop a few times, before making important decisions */
405	{	892	{
406	now = get_clock ();	893	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
407	diff = ev_now - now;
408		894
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	895	if (fabs (diff) >= 1e-4)
410	return; /* all is well */	896	{
		897	ev_periodic_stop (EV_A_ w);
		898	ev_periodic_start (EV_A_ w);
411		899
412	ev_now = ev_time ();	900	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		901	}
413	}	902	}
		903	}
		904	}
414		905
415	/* time jump detected, reschedule atimers */	906	inline int
416	for (i = 0; i < atimercnt; ++i)	907	time_update_monotonic (EV_P)
		908	{
		909	mn_now = get_clock ();
		910
		911	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		912	{
		913	rt_now = rtmn_diff + mn_now;
		914	return 0;
		915	}
		916	else
		917	{
		918	now_floor = mn_now;
		919	rt_now = ev_time ();
		920	return 1;
		921	}
		922	}
		923
		924	static void
		925	time_update (EV_P)
		926	{
		927	int i;
		928
		929	#if EV_USE_MONOTONIC
		930	if (expect_true (have_monotonic))
		931	{
		932	if (time_update_monotonic (EV_A))
417	{	933	{
418	struct ev_timer *w = atimers [i];	934	ev_tstamp odiff = rtmn_diff;
419	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	935
		936	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		937	{
		938	rtmn_diff = rt_now - mn_now;
		939
		940	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		941	return; /* all is well */
		942
		943	rt_now = ev_time ();
		944	mn_now = get_clock ();
		945	now_floor = mn_now;
		946	}
		947
		948	periodics_reschedule (EV_A);
		949	/* no timer adjustment, as the monotonic clock doesn't jump */
		950	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
420	}	951	}
421	}	952	}
422	else	953	else
		954	#endif
423	{	955	{
424	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	956	rt_now = ev_time ();
425	/* time jump detected, adjust rtimers */	957
		958	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		959	{
		960	periodics_reschedule (EV_A);
		961
		962	/* adjust timers. this is easy, as the offset is the same for all */
426	for (i = 0; i < rtimercnt; ++i)	963	for (i = 0; i < timercnt; ++i)
427	rtimers [i]->at += ev_now - now;	964	((WT)timers [i])->at += rt_now - mn_now;
		965	}
428		966
429	now = ev_now;	967	mn_now = rt_now;
430	}	968	}
431	}	969	}
432		970
433	int ev_loop_done;	971	void
		972	ev_ref (EV_P)
		973	{
		974	++activecnt;
		975	}
434		976
		977	void
		978	ev_unref (EV_P)
		979	{
		980	--activecnt;
		981	}
		982
		983	static int loop_done;
		984
		985	void
435	void ev_loop (int flags)	986	ev_loop (EV_P_ int flags)
436	{	987	{
437	double block;	988	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	989	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
439		990
440	do	991	do
441	{	992	{
		993	/* queue check watchers (and execute them) */
		994	if (expect_false (preparecnt))
		995	{
		996	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		997	call_pending (EV_A);
		998	}
		999
442	/* update fd-related kernel structures */	1000	/* update fd-related kernel structures */
443	fd_reify ();	1001	fd_reify (EV_A);
444		1002
445	/* calculate blocking time */	1003	/* calculate blocking time */
		1004
		1005	/* we only need this for !monotonic clockor timers, but as we basically
		1006	always have timers, we just calculate it always */
		1007	#if EV_USE_MONOTONIC
		1008	if (expect_true (have_monotonic))
		1009	time_update_monotonic (EV_A);
		1010	else
		1011	#endif
		1012	{
		1013	rt_now = ev_time ();
		1014	mn_now = rt_now;
		1015	}
		1016
446	if (flags & EVLOOP_NONBLOCK)	1017	if (flags & EVLOOP_NONBLOCK || idlecnt)
447	block = 0.;	1018	block = 0.;
448	else	1019	else
449	{	1020	{
450	block = MAX_BLOCKTIME;	1021	block = MAX_BLOCKTIME;
451		1022
452	if (rtimercnt)	1023	if (timercnt)
453	{	1024	{
454	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1025	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
455	if (block > to) block = to;	1026	if (block > to) block = to;
456	}	1027	}
457		1028
458	if (atimercnt)	1029	if (periodiccnt)
459	{	1030	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1031	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
461	if (block > to) block = to;	1032	if (block > to) block = to;
462	}	1033	}
463		1034
464	if (block < 0.) block = 0.;	1035	if (block < 0.) block = 0.;
465	}	1036	}
466		1037
467	method_poll (block);	1038	method_poll (EV_A_ block);
468		1039
469	/* update ev_now, do magic */	1040	/* update rt_now, do magic */
470	time_update ();	1041	time_update (EV_A);
471		1042
472	/* put pending timers into pendign queue and reschedule them */	1043	/* queue pending timers and reschedule them */
473	/* absolute timers first */	1044	timers_reify (EV_A); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	1045	periodics_reify (EV_A); /* absolute timers called first */
475	/* relative timers second */
476	timers_reify (rtimers, rtimercnt, now);
477		1046
		1047	/* queue idle watchers unless io or timers are pending */
		1048	if (!pendingcnt)
		1049	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1050
		1051	/* queue check watchers, to be executed first */
		1052	if (checkcnt)
		1053	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1054
478	call_pending ();	1055	call_pending (EV_A);
479	}	1056	}
480	while (!ev_loop_done);	1057	while (activecnt && !loop_done);
481	}
482		1058
483	static void	1059	if (loop_done != 2)
484	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1060	loop_done = 0;
		1061	}
		1062
		1063	void
		1064	ev_unloop (EV_P_ int how)
		1065	{
		1066	loop_done = how;
		1067	}
		1068
		1069	/*****************************************************************************/
		1070
		1071	inline void
		1072	wlist_add (WL *head, WL elem)
485	{	1073	{
486	elem->next = *head;	1074	elem->next = *head;
487	*head = elem;	1075	*head = elem;
488	}	1076	}
489		1077
490	static void	1078	inline void
491	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1079	wlist_del (WL *head, WL elem)
492	{	1080	{
493	while (*head)	1081	while (*head)
494	{	1082	{
495	if (*head == elem)	1083	if (*head == elem)
496	{	1084	{
…		…
500		1088
501	head = &(*head)->next;	1089	head = &(*head)->next;
502	}	1090	}
503	}	1091	}
504		1092
505	static void	1093	inline void
506	ev_start (struct ev_watcher *w, int active)	1094	ev_clear_pending (EV_P_ W w)
507	{	1095	{
		1096	if (w->pending)
		1097	{
		1098	pendings [ABSPRI (w)][w->pending - 1].w = 0;
508	w->pending = 0;	1099	w->pending = 0;
		1100	}
		1101	}
		1102
		1103	inline void
		1104	ev_start (EV_P_ W w, int active)
		1105	{
		1106	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1107	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1108
509	w->active = active;	1109	w->active = active;
		1110	ev_ref (EV_A);
510	}	1111	}
511		1112
512	static void	1113	inline void
513	ev_stop (struct ev_watcher *w)	1114	ev_stop (EV_P_ W w)
514	{	1115	{
515	if (w->pending)	1116	ev_unref (EV_A);
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	1117	w->active = 0;
519	/* nop */
520	}	1118	}
521		1119
		1120	/*****************************************************************************/
		1121
522	void	1122	void
523	evio_start (struct ev_io *w)	1123	ev_io_start (EV_P_ struct ev_io *w)
524	{	1124	{
		1125	int fd = w->fd;
		1126
525	if (ev_is_active (w))	1127	if (ev_is_active (w))
526	return;	1128	return;
527		1129
528	int fd = w->fd;	1130	assert (("ev_io_start called with negative fd", fd >= 0));
529		1131
530	ev_start ((struct ev_watcher *)w, 1);	1132	ev_start (EV_A_ (W)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1133	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1134	wlist_add ((WL *)&anfds[fd].head, (WL)w);
533		1135
534	++fdchangecnt;	1136	fd_change (EV_A_ fd);
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}	1137	}
538		1138
539	void	1139	void
540	evio_stop (struct ev_io *w)	1140	ev_io_stop (EV_P_ struct ev_io *w)
541	{	1141	{
		1142	ev_clear_pending (EV_A_ (W)w);
542	if (!ev_is_active (w))	1143	if (!ev_is_active (w))
543	return;	1144	return;
544		1145
545	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1146	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
546	ev_stop ((struct ev_watcher *)w);	1147	ev_stop (EV_A_ (W)w);
547		1148
548	++fdchangecnt;	1149	fd_change (EV_A_ w->fd);
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}	1150	}
552		1151
553	void	1152	void
554	evtimer_start (struct ev_timer *w)	1153	ev_timer_start (EV_P_ struct ev_timer *w)
555	{	1154	{
556	if (ev_is_active (w))	1155	if (ev_is_active (w))
557	return;	1156	return;
558		1157
559	if (w->is_abs)	1158	((WT)w)->at += mn_now;
		1159
		1160	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1161
		1162	ev_start (EV_A_ (W)w, ++timercnt);
		1163	array_needsize (timers, timermax, timercnt, );
		1164	timers [timercnt - 1] = w;
		1165	upheap ((WT *)timers, timercnt - 1);
		1166
		1167	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1168	}
		1169
		1170	void
		1171	ev_timer_stop (EV_P_ struct ev_timer *w)
		1172	{
		1173	ev_clear_pending (EV_A_ (W)w);
		1174	if (!ev_is_active (w))
		1175	return;
		1176
		1177	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1178
		1179	if (((W)w)->active < timercnt--)
		1180	{
		1181	timers [((W)w)->active - 1] = timers [timercnt];
		1182	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
560	{	1183	}
561	/* this formula differs from the one in timer_reify becuse we do not round up */	1184
		1185	((WT)w)->at = w->repeat;
		1186
		1187	ev_stop (EV_A_ (W)w);
		1188	}
		1189
		1190	void
		1191	ev_timer_again (EV_P_ struct ev_timer *w)
		1192	{
		1193	if (ev_is_active (w))
		1194	{
562	if (w->repeat)	1195	if (w->repeat)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1196	{
564		1197	((WT)w)->at = mn_now + w->repeat;
565	ev_start ((struct ev_watcher *)w, ++atimercnt);	1198	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
566	array_needsize (atimers, atimermax, atimercnt, );	1199	}
567	atimers [atimercnt - 1] = w;
568	upheap (atimers, atimercnt - 1);
569	}
570	else	1200	else
		1201	ev_timer_stop (EV_A_ w);
571	{	1202	}
572	w->at += now;	1203	else if (w->repeat)
573		1204	ev_timer_start (EV_A_ w);
574	ev_start ((struct ev_watcher *)w, ++rtimercnt);
575	array_needsize (rtimers, rtimermax, rtimercnt, );
576	rtimers [rtimercnt - 1] = w;
577	upheap (rtimers, rtimercnt - 1);
578	}
579
580	}	1205	}
581		1206
582	void	1207	void
583	evtimer_stop (struct ev_timer *w)	1208	ev_periodic_start (EV_P_ struct ev_periodic *w)
584	{	1209	{
		1210	if (ev_is_active (w))
		1211	return;
		1212
		1213	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1214
		1215	/* this formula differs from the one in periodic_reify because we do not always round up */
		1216	if (w->interval)
		1217	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1218
		1219	ev_start (EV_A_ (W)w, ++periodiccnt);
		1220	array_needsize (periodics, periodicmax, periodiccnt, );
		1221	periodics [periodiccnt - 1] = w;
		1222	upheap ((WT *)periodics, periodiccnt - 1);
		1223
		1224	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1225	}
		1226
		1227	void
		1228	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1229	{
		1230	ev_clear_pending (EV_A_ (W)w);
585	if (!ev_is_active (w))	1231	if (!ev_is_active (w))
586	return;	1232	return;
587		1233
588	if (w->is_abs)	1234	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
589	{	1235
590	if (w->active < atimercnt--)	1236	if (((W)w)->active < periodiccnt--)
591	{
592	atimers [w->active - 1] = atimers [atimercnt];
593	downheap (atimers, atimercnt, w->active - 1);
594	}
595	}	1237	{
596	else	1238	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1239	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
597	{	1240	}
598	if (w->active < rtimercnt--)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}
604		1241
605	ev_stop ((struct ev_watcher *)w);	1242	ev_stop (EV_A_ (W)w);
606	}	1243	}
607		1244
608	void	1245	void
609	evsignal_start (struct ev_signal *w)	1246	ev_idle_start (EV_P_ struct ev_idle *w)
610	{	1247	{
611	if (ev_is_active (w))	1248	if (ev_is_active (w))
612	return;	1249	return;
613		1250
614	ev_start ((struct ev_watcher *)w, 1);	1251	ev_start (EV_A_ (W)w, ++idlecnt);
		1252	array_needsize (idles, idlemax, idlecnt, );
		1253	idles [idlecnt - 1] = w;
		1254	}
		1255
		1256	void
		1257	ev_idle_stop (EV_P_ struct ev_idle *w)
		1258	{
		1259	ev_clear_pending (EV_A_ (W)w);
		1260	if (ev_is_active (w))
		1261	return;
		1262
		1263	idles [((W)w)->active - 1] = idles [--idlecnt];
		1264	ev_stop (EV_A_ (W)w);
		1265	}
		1266
		1267	void
		1268	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1269	{
		1270	if (ev_is_active (w))
		1271	return;
		1272
		1273	ev_start (EV_A_ (W)w, ++preparecnt);
		1274	array_needsize (prepares, preparemax, preparecnt, );
		1275	prepares [preparecnt - 1] = w;
		1276	}
		1277
		1278	void
		1279	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1280	{
		1281	ev_clear_pending (EV_A_ (W)w);
		1282	if (ev_is_active (w))
		1283	return;
		1284
		1285	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1286	ev_stop (EV_A_ (W)w);
		1287	}
		1288
		1289	void
		1290	ev_check_start (EV_P_ struct ev_check *w)
		1291	{
		1292	if (ev_is_active (w))
		1293	return;
		1294
		1295	ev_start (EV_A_ (W)w, ++checkcnt);
		1296	array_needsize (checks, checkmax, checkcnt, );
		1297	checks [checkcnt - 1] = w;
		1298	}
		1299
		1300	void
		1301	ev_check_stop (EV_P_ struct ev_check *w)
		1302	{
		1303	ev_clear_pending (EV_A_ (W)w);
		1304	if (ev_is_active (w))
		1305	return;
		1306
		1307	checks [((W)w)->active - 1] = checks [--checkcnt];
		1308	ev_stop (EV_A_ (W)w);
		1309	}
		1310
		1311	#ifndef SA_RESTART
		1312	# define SA_RESTART 0
		1313	#endif
		1314
		1315	void
		1316	ev_signal_start (EV_P_ struct ev_signal *w)
		1317	{
		1318	#if EV_MULTIPLICITY
		1319	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1320	#endif
		1321	if (ev_is_active (w))
		1322	return;
		1323
		1324	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1325
		1326	ev_start (EV_A_ (W)w, 1);
615	array_needsize (signals, signalmax, w->signum, signals_init);	1327	array_needsize (signals, signalmax, w->signum, signals_init);
616	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1328	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
617		1329
618	if (!w->next)	1330	if (!((WL)w)->next)
619	{	1331	{
		1332	#if WIN32
		1333	signal (w->signum, sighandler);
		1334	#else
620	struct sigaction sa;	1335	struct sigaction sa;
621	sa.sa_handler = sighandler;	1336	sa.sa_handler = sighandler;
622	sigfillset (&sa.sa_mask);	1337	sigfillset (&sa.sa_mask);
623	sa.sa_flags = 0;	1338	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
624	sigaction (w->signum, &sa, 0);	1339	sigaction (w->signum, &sa, 0);
		1340	#endif
625	}	1341	}
626	}	1342	}
627		1343
628	void	1344	void
629	evsignal_stop (struct ev_signal *w)	1345	ev_signal_stop (EV_P_ struct ev_signal *w)
630	{	1346	{
		1347	ev_clear_pending (EV_A_ (W)w);
631	if (!ev_is_active (w))	1348	if (!ev_is_active (w))
632	return;	1349	return;
633		1350
634	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1351	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
635	ev_stop ((struct ev_watcher *)w);	1352	ev_stop (EV_A_ (W)w);
636		1353
637	if (!signals [w->signum - 1].head)	1354	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	1355	signal (w->signum, SIG_DFL);
639	}	1356	}
640		1357
		1358	void
		1359	ev_child_start (EV_P_ struct ev_child *w)
		1360	{
		1361	#if EV_MULTIPLICITY
		1362	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1363	#endif
		1364	if (ev_is_active (w))
		1365	return;
		1366
		1367	ev_start (EV_A_ (W)w, 1);
		1368	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1369	}
		1370
		1371	void
		1372	ev_child_stop (EV_P_ struct ev_child *w)
		1373	{
		1374	ev_clear_pending (EV_A_ (W)w);
		1375	if (ev_is_active (w))
		1376	return;
		1377
		1378	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1379	ev_stop (EV_A_ (W)w);
		1380	}
		1381
641	/*****************************************************************************/	1382	/*****************************************************************************/
642	#if 1
643		1383
644	static void	1384	struct ev_once
645	sin_cb (struct ev_io *w, int revents)
646	{	1385	{
647	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
648	}
649
650	static void
651	ocb (struct ev_timer *w, int revents)
652	{
653	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
654	evtimer_stop (w);
655	evtimer_start (w);
656	}
657
658	static void
659	scb (struct ev_signal *w, int revents)
660	{
661	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
662	}
663
664	int main (void)
665	{
666	struct ev_io sin;	1386	struct ev_io io;
667
668	ev_init (0);
669
670	evw_init (&sin, sin_cb, 55);
671	evio_set (&sin, 0, EV_READ);
672	evio_start (&sin);
673
674	struct ev_timer t[10000];
675
676	#if 0
677	int i;
678	for (i = 0; i < 10000; ++i)
679	{
680	struct ev_timer *w = t + i;
681	evw_init (w, ocb, i);
682	evtimer_set_abs (w, drand48 (), 0.99775533);
683	evtimer_start (w);
684	if (drand48 () < 0.5)
685	evtimer_stop (w);
686	}
687	#endif
688
689	struct ev_timer t1;	1387	struct ev_timer to;
690	evw_init (&t1, ocb, 0);	1388	void (*cb)(int revents, void *arg);
691	evtimer_set_abs (&t1, 5, 10);	1389	void *arg;
692	evtimer_start (&t1);	1390	};
693		1391
694	struct ev_signal sig;	1392	static void
695	evw_init (&sig, scb, 65535);	1393	once_cb (EV_P_ struct ev_once *once, int revents)
696	evsignal_set (&sig, SIGQUIT);	1394	{
697	evsignal_start (&sig);	1395	void (*cb)(int revents, void *arg) = once->cb;
		1396	void *arg = once->arg;
698		1397
699	ev_loop (0);	1398	ev_io_stop (EV_A_ &once->io);
		1399	ev_timer_stop (EV_A_ &once->to);
		1400	free (once);
700		1401
701	return 0;	1402	cb (revents, arg);
702	}	1403	}
703		1404
704	#endif	1405	static void
		1406	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1407	{
		1408	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1409	}
705		1410
		1411	static void
		1412	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1413	{
		1414	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1415	}
706		1416
		1417	void
		1418	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1419	{
		1420	struct ev_once *once = malloc (sizeof (struct ev_once));
707		1421
		1422	if (!once)
		1423	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1424	else
		1425	{
		1426	once->cb = cb;
		1427	once->arg = arg;
708		1428
		1429	ev_watcher_init (&once->io, once_cb_io);
		1430	if (fd >= 0)
		1431	{
		1432	ev_io_set (&once->io, fd, events);
		1433	ev_io_start (EV_A_ &once->io);
		1434	}
		1435
		1436	ev_watcher_init (&once->to, once_cb_to);
		1437	if (timeout >= 0.)
		1438	{
		1439	ev_timer_set (&once->to, timeout, 0.);
		1440	ev_timer_start (EV_A_ &once->to);
		1441	}
		1442	}
		1443	}
		1444

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