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Comparing libev/ev.c (file contents):
Revision 1.6 by root, Tue Oct 30 23:55:29 2007 UTC vs.
Revision 1.71 by root, Tue Nov 6 13:17:55 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>
		59	#include <fcntl.h>
		60	#include <stddef.h>
3		61
4	#include <stdio.h>	62	#include <stdio.h>
5		63
6	#include <assert.h>	64	#include <assert.h>
7	#include <errno.h>	65	#include <errno.h>
8	#include <sys/time.h>	66	#include <sys/types.h>
9	#include <time.h>	67	#include <time.h>
10		68
		69	#ifndef PERL
		70	# include <signal.h>
		71	#endif
		72
		73	#ifndef WIN32
		74	# include <unistd.h>
		75	# include <sys/time.h>
		76	# include <sys/wait.h>
		77	#endif
		78	/**/
		79
		80	#ifndef EV_USE_MONOTONIC
		81	# define EV_USE_MONOTONIC 1
		82	#endif
		83
		84	#ifndef EV_USE_SELECT
		85	# define EV_USE_SELECT 1
		86	#endif
		87
		88	#ifndef EV_USE_POLL
		89	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		90	#endif
		91
		92	#ifndef EV_USE_EPOLL
		93	# define EV_USE_EPOLL 0
		94	#endif
		95
		96	#ifndef EV_USE_KQUEUE
		97	# define EV_USE_KQUEUE 0
		98	#endif
		99
		100	#ifndef EV_USE_WIN32
		101	# ifdef WIN32
		102	# define EV_USE_WIN32 0 /* it does not exist, use select */
		103	# undef EV_USE_SELECT
		104	# define EV_USE_SELECT 1
		105	# else
		106	# define EV_USE_WIN32 0
		107	# endif
		108	#endif
		109
		110	#ifndef EV_USE_REALTIME
		111	# define EV_USE_REALTIME 1
		112	#endif
		113
		114	/**/
		115
11	#ifdef CLOCK_MONOTONIC	116	#ifndef CLOCK_MONOTONIC
		117	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	118	# define EV_USE_MONOTONIC 0
13	#endif	119	#endif
14		120
		121	#ifndef CLOCK_REALTIME
		122	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	123	# define EV_USE_REALTIME 0
16	#define HAVE_EPOLL 1	124	#endif
17	#define HAVE_SELECT 1	125
		126	/**/
18		127
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	128	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	129	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		130	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		131	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
21		132
22	#include "ev.h"	133	#include "ev.h"
23		134
		135	#if __GNUC__ >= 3
		136	# define expect(expr,value) __builtin_expect ((expr),(value))
		137	# define inline inline
		138	#else
		139	# define expect(expr,value) (expr)
		140	# define inline static
		141	#endif
		142
		143	#define expect_false(expr) expect ((expr) != 0, 0)
		144	#define expect_true(expr) expect ((expr) != 0, 1)
		145
		146	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		147	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		148
24	struct ev_watcher {	149	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);	150	typedef struct ev_watcher_list *WL;
		151	typedef struct ev_watcher_time *WT;
		152
		153	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		154
		155	#if WIN32
		156	/* note: the comment below could not be substantiated, but what would I care */
		157	/* MSDN says this is required to handle SIGFPE */
		158	volatile double SIGFPE_REQ = 0.0f;
		159	#endif
		160
		161	/*****************************************************************************/
		162
		163	static void (*syserr_cb)(const char *msg);
		164
		165	void ev_set_syserr_cb (void (*cb)(const char *msg))
		166	{
		167	syserr_cb = cb;
		168	}
		169
		170	static void
		171	syserr (const char *msg)
		172	{
		173	if (!msg)
		174	msg = "(libev) system error";
		175
		176	if (syserr_cb)
		177	syserr_cb (msg);
		178	else
		179	{
		180	perror (msg);
		181	abort ();
		182	}
		183	}
		184
		185	static void *(*alloc)(void *ptr, long size);
		186
		187	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		188	{
		189	alloc = cb;
		190	}
		191
		192	static void *
		193	ev_realloc (void *ptr, long size)
		194	{
		195	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		196
		197	if (!ptr && size)
		198	{
		199	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		200	abort ();
		201	}
		202
		203	return ptr;
		204	}
		205
		206	#define ev_malloc(size) ev_realloc (0, (size))
		207	#define ev_free(ptr) ev_realloc ((ptr), 0)
		208
		209	/*****************************************************************************/
		210
		211	typedef struct
		212	{
		213	WL head;
		214	unsigned char events;
		215	unsigned char reify;
		216	} ANFD;
		217
		218	typedef struct
		219	{
		220	W w;
		221	int events;
		222	} ANPENDING;
		223
		224	#if EV_MULTIPLICITY
		225
		226	struct ev_loop
		227	{
		228	# define VAR(name,decl) decl;
		229	# include "ev_vars.h"
26	};	230	};
		231	# undef VAR
		232	# include "ev_wrap.h"
27		233
28	struct ev_watcher_list {	234	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		235
32	static ev_tstamp now, diff; /* monotonic clock */	236	# define VAR(name,decl) static decl;
33	ev_tstamp ev_now;	237	# include "ev_vars.h"
34	int ev_method;	238	# undef VAR
35		239
36	static int have_monotonic; /* runtime */	240	#endif
37		241
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	242	/*****************************************************************************/
39	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);
41		243
42	ev_tstamp	244	inline ev_tstamp
43	ev_time (void)	245	ev_time (void)
44	{	246	{
45	#if HAVE_REALTIME	247	#if EV_USE_REALTIME
46	struct timespec ts;	248	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	249	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	250	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	251	#else
50	struct timeval tv;	252	struct timeval tv;
51	gettimeofday (&tv, 0);	253	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	254	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	255	#endif
54	}	256	}
55		257
56	static ev_tstamp	258	inline ev_tstamp
57	get_clock (void)	259	get_clock (void)
58	{	260	{
59	#if HAVE_MONOTONIC	261	#if EV_USE_MONOTONIC
60	if (have_monotonic)	262	if (expect_true (have_monotonic))
61	{	263	{
62	struct timespec ts;	264	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	265	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	266	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	267	}
66	#endif	268	#endif
67		269
68	return ev_time ();	270	return ev_time ();
69	}	271	}
70		272
		273	ev_tstamp
		274	ev_now (EV_P)
		275	{
		276	return rt_now;
		277	}
		278
		279	#define array_roundsize(base,n) ((n) | 4 & ~3)
		280
71	#define array_needsize(base,cur,cnt,init) \	281	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	282	if (expect_false ((cnt) > cur)) \
73	{ \	283	{ \
74	int newcnt = cur ? cur << 1 : 16; \	284	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	285	do \
		286	{ \
		287	newcnt = array_roundsize (base, newcnt << 1); \
		288	} \
		289	while ((cnt) > newcnt); \
		290	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	291	base = ev_realloc (base, sizeof (*base) * (newcnt)); \
77	init (base + cur, newcnt - cur); \	292	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	293	cur = newcnt; \
79	}	294	}
80		295
81	typedef struct	296	#define array_slim(stem) \
82	{	297	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	298	{ \
84	unsigned char wev, rev; /* want, received event set */	299	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	300	base = ev_realloc (base, sizeof (*base) * (stem ## max)); \
		301	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		302	}
86		303
87	static ANFD *anfds;	304	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
88	static int anfdmax;	305	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		306	#define array_free_microshit(stem) \
		307	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
89		308
90	static int *fdchanges;	309	#define array_free(stem, idx) \
91	static int fdchangemax, fdchangecnt;	310	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		311
		312	/*****************************************************************************/
92		313
93	static void	314	static void
94	anfds_init (ANFD *base, int count)	315	anfds_init (ANFD *base, int count)
95	{	316	{
96	while (count--)	317	while (count--)
97	{	318	{
98	base->head = 0;	319	base->head = 0;
99	base->wev = base->rev = EV_NONE;	320	base->events = EV_NONE;
		321	base->reify = 0;
		322
100	++base;	323	++base;
101	}	324	}
102	}	325	}
103		326
104	typedef struct
105	{
106	struct ev_watcher *w;
107	int events;
108	} ANPENDING;
109
110	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;
112
113	static void	327	static void
114	event (struct ev_watcher *w, int events)	328	event (EV_P_ W w, int events)
115	{	329	{
		330	if (w->pending)
		331	{
		332	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		333	return;
		334	}
		335
116	w->pending = ++pendingcnt;	336	w->pending = ++pendingcnt [ABSPRI (w)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	337	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], (void));
118	pendings [pendingcnt - 1].w = w;	338	pendings [ABSPRI (w)][w->pending - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	339	pendings [ABSPRI (w)][w->pending - 1].events = events;
120	}	340	}
121		341
122	static void	342	static void
		343	queue_events (EV_P_ W *events, int eventcnt, int type)
		344	{
		345	int i;
		346
		347	for (i = 0; i < eventcnt; ++i)
		348	event (EV_A_ events [i], type);
		349	}
		350
		351	static void
123	fd_event (int fd, int events)	352	fd_event (EV_P_ int fd, int events)
124	{	353	{
125	ANFD *anfd = anfds + fd;	354	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	355	struct ev_io *w;
127		356
128	for (w = anfd->head; w; w = w->next)	357	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	358	{
130	int ev = w->events & events;	359	int ev = w->events & events;
131		360
132	if (ev)	361	if (ev)
133	event ((struct ev_watcher *)w, ev);	362	event (EV_A_ (W)w, ev);
134	}
135	}
136
137	static struct ev_timer **atimers;
138	static int atimermax, atimercnt;
139
140	static struct ev_timer **rtimers;
141	static int rtimermax, rtimercnt;
142
143	static void
144	upheap (struct ev_timer **timers, int k)
145	{
146	struct ev_timer *w = timers [k];
147
148	while (k && timers [k >> 1]->at > w->at)
149	{	363	}
150	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;
152	k >>= 1;
153	}
154
155	timers [k] = w;
156	timers [k]->active = k + 1;
157
158	}	364	}
159		365
160	static void	366	/*****************************************************************************/
161	downheap (struct ev_timer **timers, int N, int k)
162	{
163	struct ev_timer *w = timers [k];
164		367
165	while (k < (N >> 1))
166	{
167	int j = k << 1;
168
169	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
170	++j;
171
172	if (w->at <= timers [j]->at)
173	break;
174
175	timers [k] = timers [j];
176	timers [k]->active = k + 1;
177	k = j;
178	}
179
180	timers [k] = w;
181	timers [k]->active = k + 1;
182	}
183
184	static struct ev_signal **signals;
185	static int signalmax;
186
187	static void	368	static void
188	signals_init (struct ev_signal **base, int count)	369	fd_reify (EV_P)
189	{
190	while (count--)
191	*base++ = 0;
192	}
193
194	#if HAVE_EPOLL
195	# include "ev_epoll.c"
196	#endif
197	#if HAVE_SELECT
198	# include "ev_select.c"
199	#endif
200
201	int ev_init (int flags)
202	{
203	#if HAVE_MONOTONIC
204	{
205	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;
208	}
209	#endif
210
211	ev_now = ev_time ();
212	now = get_clock ();
213	diff = ev_now - now;
214
215	#if HAVE_EPOLL
216	if (epoll_init (flags))
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223
224	ev_method = EVMETHOD_NONE;
225	return ev_method;
226	}
227
228	void ev_prefork (void)
229	{
230	}
231
232	void ev_postfork_parent (void)
233	{
234	}
235
236	void ev_postfork_child (void)
237	{
238	#if HAVE_EPOLL
239	if (ev_method == EVMETHOD_EPOLL)
240	epoll_postfork_child ();
241	#endif
242	}
243
244	static void
245	fd_reify (void)
246	{	370	{
247	int i;	371	int i;
248		372
249	for (i = 0; i < fdchangecnt; ++i)	373	for (i = 0; i < fdchangecnt; ++i)
250	{	374	{
251	int fd = fdchanges [i];	375	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	376	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	377	struct ev_io *w;
254		378
255	int wev = 0;	379	int events = 0;
256		380
257	for (w = anfd->head; w; w = w->next)	381	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	382	events |= w->events;
259		383
260	if (anfd->wev != wev)	384	anfd->reify = 0;
		385
		386	method_modify (EV_A_ fd, anfd->events, events);
		387	anfd->events = events;
		388	}
		389
		390	fdchangecnt = 0;
		391	}
		392
		393	static void
		394	fd_change (EV_P_ int fd)
		395	{
		396	if (anfds [fd].reify)
		397	return;
		398
		399	anfds [fd].reify = 1;
		400
		401	++fdchangecnt;
		402	array_needsize (fdchanges, fdchangemax, fdchangecnt, (void));
		403	fdchanges [fdchangecnt - 1] = fd;
		404	}
		405
		406	static void
		407	fd_kill (EV_P_ int fd)
		408	{
		409	struct ev_io *w;
		410
		411	while ((w = (struct ev_io *)anfds [fd].head))
		412	{
		413	ev_io_stop (EV_A_ w);
		414	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		415	}
		416	}
		417
		418	static int
		419	fd_valid (int fd)
		420	{
		421	#ifdef WIN32
		422	return !!win32_get_osfhandle (fd);
		423	#else
		424	return fcntl (fd, F_GETFD) != -1;
		425	#endif
		426	}
		427
		428	/* called on EBADF to verify fds */
		429	static void
		430	fd_ebadf (EV_P)
		431	{
		432	int fd;
		433
		434	for (fd = 0; fd < anfdmax; ++fd)
		435	if (anfds [fd].events)
		436	if (!fd_valid (fd) == -1 && errno == EBADF)
		437	fd_kill (EV_A_ fd);
		438	}
		439
		440	/* called on ENOMEM in select/poll to kill some fds and retry */
		441	static void
		442	fd_enomem (EV_P)
		443	{
		444	int fd;
		445
		446	for (fd = anfdmax; fd--; )
		447	if (anfds [fd].events)
		448	{
		449	fd_kill (EV_A_ fd);
		450	return;
		451	}
		452	}
		453
		454	/* usually called after fork if method needs to re-arm all fds from scratch */
		455	static void
		456	fd_rearm_all (EV_P)
		457	{
		458	int fd;
		459
		460	/* this should be highly optimised to not do anything but set a flag */
		461	for (fd = 0; fd < anfdmax; ++fd)
		462	if (anfds [fd].events)
		463	{
		464	anfds [fd].events = 0;
		465	fd_change (EV_A_ fd);
		466	}
		467	}
		468
		469	/*****************************************************************************/
		470
		471	static void
		472	upheap (WT *heap, int k)
		473	{
		474	WT w = heap [k];
		475
		476	while (k && heap [k >> 1]->at > w->at)
		477	{
		478	heap [k] = heap [k >> 1];
		479	((W)heap [k])->active = k + 1;
		480	k >>= 1;
		481	}
		482
		483	heap [k] = w;
		484	((W)heap [k])->active = k + 1;
		485
		486	}
		487
		488	static void
		489	downheap (WT *heap, int N, int k)
		490	{
		491	WT w = heap [k];
		492
		493	while (k < (N >> 1))
		494	{
		495	int j = k << 1;
		496
		497	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		498	++j;
		499
		500	if (w->at <= heap [j]->at)
		501	break;
		502
		503	heap [k] = heap [j];
		504	((W)heap [k])->active = k + 1;
		505	k = j;
		506	}
		507
		508	heap [k] = w;
		509	((W)heap [k])->active = k + 1;
		510	}
		511
		512	/*****************************************************************************/
		513
		514	typedef struct
		515	{
		516	WL head;
		517	sig_atomic_t volatile gotsig;
		518	} ANSIG;
		519
		520	static ANSIG *signals;
		521	static int signalmax;
		522
		523	static int sigpipe [2];
		524	static sig_atomic_t volatile gotsig;
		525	static struct ev_io sigev;
		526
		527	static void
		528	signals_init (ANSIG *base, int count)
		529	{
		530	while (count--)
		531	{
		532	base->head = 0;
		533	base->gotsig = 0;
		534
		535	++base;
		536	}
		537	}
		538
		539	static void
		540	sighandler (int signum)
		541	{
		542	#if WIN32
		543	signal (signum, sighandler);
		544	#endif
		545
		546	signals [signum - 1].gotsig = 1;
		547
		548	if (!gotsig)
		549	{
		550	int old_errno = errno;
		551	gotsig = 1;
		552	write (sigpipe [1], &signum, 1);
		553	errno = old_errno;
		554	}
		555	}
		556
		557	static void
		558	sigcb (EV_P_ struct ev_io *iow, int revents)
		559	{
		560	WL w;
		561	int signum;
		562
		563	read (sigpipe [0], &revents, 1);
		564	gotsig = 0;
		565
		566	for (signum = signalmax; signum--; )
		567	if (signals [signum].gotsig)
		568	{
		569	signals [signum].gotsig = 0;
		570
		571	for (w = signals [signum].head; w; w = w->next)
		572	event (EV_A_ (W)w, EV_SIGNAL);
		573	}
		574	}
		575
		576	static void
		577	siginit (EV_P)
		578	{
		579	#ifndef WIN32
		580	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		581	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		582
		583	/* rather than sort out wether we really need nb, set it */
		584	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		585	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		586	#endif
		587
		588	ev_io_set (&sigev, sigpipe [0], EV_READ);
		589	ev_io_start (EV_A_ &sigev);
		590	ev_unref (EV_A); /* child watcher should not keep loop alive */
		591	}
		592
		593	/*****************************************************************************/
		594
		595	static struct ev_child *childs [PID_HASHSIZE];
		596
		597	#ifndef WIN32
		598
		599	static struct ev_signal childev;
		600
		601	#ifndef WCONTINUED
		602	# define WCONTINUED 0
		603	#endif
		604
		605	static void
		606	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		607	{
		608	struct ev_child *w;
		609
		610	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		611	if (w->pid == pid || !w->pid)
		612	{
		613	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		614	w->rpid = pid;
		615	w->rstatus = status;
		616	event (EV_A_ (W)w, EV_CHILD);
		617	}
		618	}
		619
		620	static void
		621	childcb (EV_P_ struct ev_signal *sw, int revents)
		622	{
		623	int pid, status;
		624
		625	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		626	{
		627	/* make sure we are called again until all childs have been reaped */
		628	event (EV_A_ (W)sw, EV_SIGNAL);
		629
		630	child_reap (EV_A_ sw, pid, pid, status);
		631	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		632	}
		633	}
		634
		635	#endif
		636
		637	/*****************************************************************************/
		638
		639	#if EV_USE_KQUEUE
		640	# include "ev_kqueue.c"
		641	#endif
		642	#if EV_USE_EPOLL
		643	# include "ev_epoll.c"
		644	#endif
		645	#if EV_USE_POLL
		646	# include "ev_poll.c"
		647	#endif
		648	#if EV_USE_SELECT
		649	# include "ev_select.c"
		650	#endif
		651
		652	int
		653	ev_version_major (void)
		654	{
		655	return EV_VERSION_MAJOR;
		656	}
		657
		658	int
		659	ev_version_minor (void)
		660	{
		661	return EV_VERSION_MINOR;
		662	}
		663
		664	/* return true if we are running with elevated privileges and should ignore env variables */
		665	static int
		666	enable_secure (void)
		667	{
		668	#ifdef WIN32
		669	return 0;
		670	#else
		671	return getuid () != geteuid ()
		672	|| getgid () != getegid ();
		673	#endif
		674	}
		675
		676	int
		677	ev_method (EV_P)
		678	{
		679	return method;
		680	}
		681
		682	static void
		683	loop_init (EV_P_ int methods)
		684	{
		685	if (!method)
		686	{
		687	#if EV_USE_MONOTONIC
		688	{
		689	struct timespec ts;
		690	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		691	have_monotonic = 1;
		692	}
		693	#endif
		694
		695	rt_now = ev_time ();
		696	mn_now = get_clock ();
		697	now_floor = mn_now;
		698	rtmn_diff = rt_now - mn_now;
		699
		700	if (methods == EVMETHOD_AUTO)
		701	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		702	methods = atoi (getenv ("LIBEV_METHODS"));
		703	else
		704	methods = EVMETHOD_ANY;
		705
		706	method = 0;
		707	#if EV_USE_WIN32
		708	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		709	#endif
		710	#if EV_USE_KQUEUE
		711	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		712	#endif
		713	#if EV_USE_EPOLL
		714	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		715	#endif
		716	#if EV_USE_POLL
		717	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		718	#endif
		719	#if EV_USE_SELECT
		720	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		721	#endif
		722
		723	ev_watcher_init (&sigev, sigcb);
		724	ev_set_priority (&sigev, EV_MAXPRI);
		725	}
		726	}
		727
		728	void
		729	loop_destroy (EV_P)
		730	{
		731	int i;
		732
		733	#if EV_USE_WIN32
		734	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		735	#endif
		736	#if EV_USE_KQUEUE
		737	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		738	#endif
		739	#if EV_USE_EPOLL
		740	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		741	#endif
		742	#if EV_USE_POLL
		743	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		744	#endif
		745	#if EV_USE_SELECT
		746	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		747	#endif
		748
		749	for (i = NUMPRI; i--; )
		750	array_free (pending, [i]);
		751
		752	/* have to use the microsoft-never-gets-it-right macro */
		753	array_free_microshit (fdchange);
		754	array_free_microshit (timer);
		755	array_free_microshit (periodic);
		756	array_free_microshit (idle);
		757	array_free_microshit (prepare);
		758	array_free_microshit (check);
		759
		760	method = 0;
		761	}
		762
		763	static void
		764	loop_fork (EV_P)
		765	{
		766	#if EV_USE_EPOLL
		767	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		768	#endif
		769	#if EV_USE_KQUEUE
		770	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		771	#endif
		772
		773	if (ev_is_active (&sigev))
		774	{
		775	/* default loop */
		776
		777	ev_ref (EV_A);
		778	ev_io_stop (EV_A_ &sigev);
		779	close (sigpipe [0]);
		780	close (sigpipe [1]);
		781
		782	while (pipe (sigpipe))
		783	syserr ("(libev) error creating pipe");
		784
		785	siginit (EV_A);
		786	}
		787
		788	postfork = 0;
		789	}
		790
		791	#if EV_MULTIPLICITY
		792	struct ev_loop *
		793	ev_loop_new (int methods)
		794	{
		795	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		796
		797	memset (loop, 0, sizeof (struct ev_loop));
		798
		799	loop_init (EV_A_ methods);
		800
		801	if (ev_method (EV_A))
		802	return loop;
		803
		804	return 0;
		805	}
		806
		807	void
		808	ev_loop_destroy (EV_P)
		809	{
		810	loop_destroy (EV_A);
		811	ev_free (loop);
		812	}
		813
		814	void
		815	ev_loop_fork (EV_P)
		816	{
		817	postfork = 1;
		818	}
		819
		820	#endif
		821
		822	#if EV_MULTIPLICITY
		823	struct ev_loop default_loop_struct;
		824	static struct ev_loop *default_loop;
		825
		826	struct ev_loop *
		827	#else
		828	static int default_loop;
		829
		830	int
		831	#endif
		832	ev_default_loop (int methods)
		833	{
		834	if (sigpipe [0] == sigpipe [1])
		835	if (pipe (sigpipe))
		836	return 0;
		837
		838	if (!default_loop)
		839	{
		840	#if EV_MULTIPLICITY
		841	struct ev_loop *loop = default_loop = &default_loop_struct;
		842	#else
		843	default_loop = 1;
		844	#endif
		845
		846	loop_init (EV_A_ methods);
		847
		848	if (ev_method (EV_A))
261	{	849	{
262	method_modify (fd, anfd->wev, wev);	850	siginit (EV_A);
263	anfd->wev = wev;	851
		852	#ifndef WIN32
		853	ev_signal_init (&childev, childcb, SIGCHLD);
		854	ev_set_priority (&childev, EV_MAXPRI);
		855	ev_signal_start (EV_A_ &childev);
		856	ev_unref (EV_A); /* child watcher should not keep loop alive */
		857	#endif
264	}	858	}
		859	else
		860	default_loop = 0;
265	}	861	}
266		862
267	fdchangecnt = 0;	863	return default_loop;
268	}	864	}
269		865
		866	void
		867	ev_default_destroy (void)
		868	{
		869	#if EV_MULTIPLICITY
		870	struct ev_loop *loop = default_loop;
		871	#endif
		872
		873	#ifndef WIN32
		874	ev_ref (EV_A); /* child watcher */
		875	ev_signal_stop (EV_A_ &childev);
		876	#endif
		877
		878	ev_ref (EV_A); /* signal watcher */
		879	ev_io_stop (EV_A_ &sigev);
		880
		881	close (sigpipe [0]); sigpipe [0] = 0;
		882	close (sigpipe [1]); sigpipe [1] = 0;
		883
		884	loop_destroy (EV_A);
		885	}
		886
		887	void
		888	ev_default_fork (void)
		889	{
		890	#if EV_MULTIPLICITY
		891	struct ev_loop *loop = default_loop;
		892	#endif
		893
		894	if (method)
		895	postfork = 1;
		896	}
		897
		898	/*****************************************************************************/
		899
270	static void	900	static void
271	call_pending ()	901	call_pending (EV_P)
272	{	902	{
273	int i;	903	int pri;
274		904
275	for (i = 0; i < pendingcnt; ++i)	905	for (pri = NUMPRI; pri--; )
		906	while (pendingcnt [pri])
276	{	907	{
277	ANPENDING *p = pendings + i;	908	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
278		909
279	if (p->w)	910	if (p->w)
280	{	911	{
281	p->w->pending = 0;	912	p->w->pending = 0;
282	p->w->cb (p->w, p->events);	913	p->w->cb (EV_A_ p->w, p->events);
283	}	914	}
284	}	915	}
285
286	pendingcnt = 0;
287	}	916	}
288		917
289	static void	918	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	919	timers_reify (EV_P)
291	{	920	{
292	while (timercnt && timers [0]->at <= now)	921	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	922	{
294	struct ev_timer *w = timers [0];	923	struct ev_timer *w = timers [0];
		924
		925	assert (("inactive timer on timer heap detected", ev_is_active (w)));
295		926
296	/* first reschedule or stop timer */	927	/* first reschedule or stop timer */
297	if (w->repeat)	928	if (w->repeat)
298	{	929	{
299	if (w->is_abs)	930	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
300	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
301	else
302	w->at = now + w->repeat;	931	((WT)w)->at = mn_now + w->repeat;
303
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	932	downheap ((WT *)timers, timercnt, 0);
307	}	933	}
308	else	934	else
		935	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		936
		937	event (EV_A_ (W)w, EV_TIMEOUT);
		938	}
		939	}
		940
		941	static void
		942	periodics_reify (EV_P)
		943	{
		944	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		945	{
		946	struct ev_periodic *w = periodics [0];
		947
		948	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		949
		950	/* first reschedule or stop timer */
		951	if (w->interval)
309	{	952	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	953	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
311	--timercnt; /* maybe pass by reference instead? */	954	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		955	downheap ((WT *)periodics, periodiccnt, 0);
312	}	956	}
		957	else
		958	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		959
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	960	event (EV_A_ (W)w, EV_PERIODIC);
315	}	961	}
316	}	962	}
317		963
318	static void	964	static void
319	time_update ()	965	periodics_reschedule (EV_P)
320	{	966	{
321	int i;	967	int i;
322	ev_now = ev_time ();
323		968
324	if (have_monotonic)	969	/* adjust periodics after time jump */
		970	for (i = 0; i < periodiccnt; ++i)
325	{	971	{
326	ev_tstamp odiff = diff;	972	struct ev_periodic *w = periodics [i];
327		973
328	/* detecting time jumps is much more difficult */	974	if (w->interval)
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */
330	{	975	{
331	now = get_clock ();	976	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
332	diff = ev_now - now;
333		977
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	978	if (fabs (diff) >= 1e-4)
335	return; /* all is well */	979	{
		980	ev_periodic_stop (EV_A_ w);
		981	ev_periodic_start (EV_A_ w);
336		982
337	ev_now = ev_time ();	983	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		984	}
338	}	985	}
		986	}
		987	}
339		988
340	/* time jump detected, reschedule atimers */	989	inline int
341	for (i = 0; i < atimercnt; ++i)	990	time_update_monotonic (EV_P)
		991	{
		992	mn_now = get_clock ();
		993
		994	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		995	{
		996	rt_now = rtmn_diff + mn_now;
		997	return 0;
		998	}
		999	else
		1000	{
		1001	now_floor = mn_now;
		1002	rt_now = ev_time ();
		1003	return 1;
		1004	}
		1005	}
		1006
		1007	static void
		1008	time_update (EV_P)
		1009	{
		1010	int i;
		1011
		1012	#if EV_USE_MONOTONIC
		1013	if (expect_true (have_monotonic))
		1014	{
		1015	if (time_update_monotonic (EV_A))
342	{	1016	{
343	struct ev_timer *w = atimers [i];	1017	ev_tstamp odiff = rtmn_diff;
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1018
		1019	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1020	{
		1021	rtmn_diff = rt_now - mn_now;
		1022
		1023	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1024	return; /* all is well */
		1025
		1026	rt_now = ev_time ();
		1027	mn_now = get_clock ();
		1028	now_floor = mn_now;
		1029	}
		1030
		1031	periodics_reschedule (EV_A);
		1032	/* no timer adjustment, as the monotonic clock doesn't jump */
		1033	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
345	}	1034	}
346	}	1035	}
347	else	1036	else
		1037	#endif
348	{	1038	{
349	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1039	rt_now = ev_time ();
350	/* time jump detected, adjust rtimers */	1040
		1041	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1042	{
		1043	periodics_reschedule (EV_A);
		1044
		1045	/* adjust timers. this is easy, as the offset is the same for all */
351	for (i = 0; i < rtimercnt; ++i)	1046	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	1047	((WT)timers [i])->at += rt_now - mn_now;
		1048	}
353		1049
354	now = ev_now;	1050	mn_now = rt_now;
355	}	1051	}
356	}	1052	}
357		1053
358	int ev_loop_done;	1054	void
		1055	ev_ref (EV_P)
		1056	{
		1057	++activecnt;
		1058	}
359		1059
		1060	void
		1061	ev_unref (EV_P)
		1062	{
		1063	--activecnt;
		1064	}
		1065
		1066	static int loop_done;
		1067
		1068	void
360	void ev_loop (int flags)	1069	ev_loop (EV_P_ int flags)
361	{	1070	{
362	double block;	1071	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1072	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		1073
365	do	1074	do
366	{	1075	{
		1076	/* queue check watchers (and execute them) */
		1077	if (expect_false (preparecnt))
		1078	{
		1079	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1080	call_pending (EV_A);
		1081	}
		1082
		1083	/* we might have forked, so reify kernel state if necessary */
		1084	if (expect_false (postfork))
		1085	loop_fork (EV_A);
		1086
367	/* update fd-related kernel structures */	1087	/* update fd-related kernel structures */
368	fd_reify ();	1088	fd_reify (EV_A);
369		1089
370	/* calculate blocking time */	1090	/* calculate blocking time */
		1091
		1092	/* we only need this for !monotonic clockor timers, but as we basically
		1093	always have timers, we just calculate it always */
		1094	#if EV_USE_MONOTONIC
		1095	if (expect_true (have_monotonic))
		1096	time_update_monotonic (EV_A);
		1097	else
		1098	#endif
		1099	{
		1100	rt_now = ev_time ();
		1101	mn_now = rt_now;
		1102	}
		1103
371	if (flags & EVLOOP_NONBLOCK)	1104	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	1105	block = 0.;
373	else	1106	else
374	{	1107	{
375	block = MAX_BLOCKTIME;	1108	block = MAX_BLOCKTIME;
376		1109
377	if (rtimercnt)	1110	if (timercnt)
378	{	1111	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1112	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
380	if (block > to) block = to;	1113	if (block > to) block = to;
381	}	1114	}
382		1115
383	if (atimercnt)	1116	if (periodiccnt)
384	{	1117	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1118	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
386	if (block > to) block = to;	1119	if (block > to) block = to;
387	}	1120	}
388		1121
389	if (block < 0.) block = 0.;	1122	if (block < 0.) block = 0.;
390	}	1123	}
391		1124
392	method_poll (block);	1125	method_poll (EV_A_ block);
393		1126
394	/* update ev_now, do magic */	1127	/* update rt_now, do magic */
395	time_update ();	1128	time_update (EV_A);
396		1129
397	/* put pending timers into pendign queue and reschedule them */	1130	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1131	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1132	periodics_reify (EV_A); /* absolute timers called first */
400	/* relative timers second */
401	timers_reify (rtimers, rtimercnt, now);
402		1133
		1134	/* queue idle watchers unless io or timers are pending */
		1135	if (!pendingcnt)
		1136	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1137
		1138	/* queue check watchers, to be executed first */
		1139	if (checkcnt)
		1140	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1141
403	call_pending ();	1142	call_pending (EV_A);
404	}	1143	}
405	while (!ev_loop_done);	1144	while (activecnt && !loop_done);
406	}
407		1145
408	static void	1146	if (loop_done != 2)
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1147	loop_done = 0;
		1148	}
		1149
		1150	void
		1151	ev_unloop (EV_P_ int how)
		1152	{
		1153	loop_done = how;
		1154	}
		1155
		1156	/*****************************************************************************/
		1157
		1158	inline void
		1159	wlist_add (WL *head, WL elem)
410	{	1160	{
411	elem->next = *head;	1161	elem->next = *head;
412	*head = elem;	1162	*head = elem;
413	}	1163	}
414		1164
415	static void	1165	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1166	wlist_del (WL *head, WL elem)
417	{	1167	{
418	while (*head)	1168	while (*head)
419	{	1169	{
420	if (*head == elem)	1170	if (*head == elem)
421	{	1171	{
…		…
425		1175
426	head = &(*head)->next;	1176	head = &(*head)->next;
427	}	1177	}
428	}	1178	}
429		1179
430	static void	1180	inline void
431	ev_start (struct ev_watcher *w, int active)	1181	ev_clear_pending (EV_P_ W w)
432	{	1182	{
		1183	if (w->pending)
		1184	{
		1185	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1186	w->pending = 0;
		1187	}
		1188	}
		1189
		1190	inline void
		1191	ev_start (EV_P_ W w, int active)
		1192	{
		1193	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1194	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1195
434	w->active = active;	1196	w->active = active;
		1197	ev_ref (EV_A);
435	}	1198	}
436		1199
437	static void	1200	inline void
438	ev_stop (struct ev_watcher *w)	1201	ev_stop (EV_P_ W w)
439	{	1202	{
440	if (w->pending)	1203	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1204	w->active = 0;
444	/* nop */
445	}	1205	}
446		1206
		1207	/*****************************************************************************/
		1208
447	void	1209	void
448	evio_start (struct ev_io *w)	1210	ev_io_start (EV_P_ struct ev_io *w)
449	{	1211	{
		1212	int fd = w->fd;
		1213
450	if (ev_is_active (w))	1214	if (ev_is_active (w))
451	return;	1215	return;
452		1216
453	int fd = w->fd;	1217	assert (("ev_io_start called with negative fd", fd >= 0));
454		1218
455	ev_start ((struct ev_watcher *)w, 1);	1219	ev_start (EV_A_ (W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1220	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1221	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		1222
459	++fdchangecnt;	1223	fd_change (EV_A_ fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1224	}
463		1225
464	void	1226	void
465	evio_stop (struct ev_io *w)	1227	ev_io_stop (EV_P_ struct ev_io *w)
466	{	1228	{
		1229	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1230	if (!ev_is_active (w))
468	return;	1231	return;
469		1232
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1233	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	1234	ev_stop (EV_A_ (W)w);
472		1235
473	++fdchangecnt;	1236	fd_change (EV_A_ w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	1237	}
477		1238
478	void	1239	void
479	evtimer_start (struct ev_timer *w)	1240	ev_timer_start (EV_P_ struct ev_timer *w)
480	{	1241	{
481	if (ev_is_active (w))	1242	if (ev_is_active (w))
482	return;	1243	return;
483		1244
484	if (w->is_abs)	1245	((WT)w)->at += mn_now;
		1246
		1247	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1248
		1249	ev_start (EV_A_ (W)w, ++timercnt);
		1250	array_needsize (timers, timermax, timercnt, (void));
		1251	timers [timercnt - 1] = w;
		1252	upheap ((WT *)timers, timercnt - 1);
		1253
		1254	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1255	}
		1256
		1257	void
		1258	ev_timer_stop (EV_P_ struct ev_timer *w)
		1259	{
		1260	ev_clear_pending (EV_A_ (W)w);
		1261	if (!ev_is_active (w))
		1262	return;
		1263
		1264	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1265
		1266	if (((W)w)->active < timercnt--)
		1267	{
		1268	timers [((W)w)->active - 1] = timers [timercnt];
		1269	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
485	{	1270	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1271
		1272	((WT)w)->at = w->repeat;
		1273
		1274	ev_stop (EV_A_ (W)w);
		1275	}
		1276
		1277	void
		1278	ev_timer_again (EV_P_ struct ev_timer *w)
		1279	{
		1280	if (ev_is_active (w))
		1281	{
487	if (w->repeat)	1282	if (w->repeat)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1283	{
		1284	((WT)w)->at = mn_now + w->repeat;
		1285	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1286	}
		1287	else
		1288	ev_timer_stop (EV_A_ w);
		1289	}
		1290	else if (w->repeat)
		1291	ev_timer_start (EV_A_ w);
		1292	}
489		1293
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	1294	void
491	array_needsize (atimers, atimermax, atimercnt, );	1295	ev_periodic_start (EV_P_ struct ev_periodic *w)
492	atimers [atimercnt - 1] = w;	1296	{
493	upheap (atimers, atimercnt - 1);	1297	if (ev_is_active (w))
		1298	return;
		1299
		1300	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1301
		1302	/* this formula differs from the one in periodic_reify because we do not always round up */
		1303	if (w->interval)
		1304	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1305
		1306	ev_start (EV_A_ (W)w, ++periodiccnt);
		1307	array_needsize (periodics, periodicmax, periodiccnt, (void));
		1308	periodics [periodiccnt - 1] = w;
		1309	upheap ((WT *)periodics, periodiccnt - 1);
		1310
		1311	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1312	}
		1313
		1314	void
		1315	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1316	{
		1317	ev_clear_pending (EV_A_ (W)w);
		1318	if (!ev_is_active (w))
		1319	return;
		1320
		1321	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1322
		1323	if (((W)w)->active < periodiccnt--)
494	}	1324	{
		1325	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1326	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1327	}
		1328
		1329	ev_stop (EV_A_ (W)w);
		1330	}
		1331
		1332	void
		1333	ev_idle_start (EV_P_ struct ev_idle *w)
		1334	{
		1335	if (ev_is_active (w))
		1336	return;
		1337
		1338	ev_start (EV_A_ (W)w, ++idlecnt);
		1339	array_needsize (idles, idlemax, idlecnt, (void));
		1340	idles [idlecnt - 1] = w;
		1341	}
		1342
		1343	void
		1344	ev_idle_stop (EV_P_ struct ev_idle *w)
		1345	{
		1346	ev_clear_pending (EV_A_ (W)w);
		1347	if (ev_is_active (w))
		1348	return;
		1349
		1350	idles [((W)w)->active - 1] = idles [--idlecnt];
		1351	ev_stop (EV_A_ (W)w);
		1352	}
		1353
		1354	void
		1355	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1356	{
		1357	if (ev_is_active (w))
		1358	return;
		1359
		1360	ev_start (EV_A_ (W)w, ++preparecnt);
		1361	array_needsize (prepares, preparemax, preparecnt, (void));
		1362	prepares [preparecnt - 1] = w;
		1363	}
		1364
		1365	void
		1366	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1367	{
		1368	ev_clear_pending (EV_A_ (W)w);
		1369	if (ev_is_active (w))
		1370	return;
		1371
		1372	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1373	ev_stop (EV_A_ (W)w);
		1374	}
		1375
		1376	void
		1377	ev_check_start (EV_P_ struct ev_check *w)
		1378	{
		1379	if (ev_is_active (w))
		1380	return;
		1381
		1382	ev_start (EV_A_ (W)w, ++checkcnt);
		1383	array_needsize (checks, checkmax, checkcnt, (void));
		1384	checks [checkcnt - 1] = w;
		1385	}
		1386
		1387	void
		1388	ev_check_stop (EV_P_ struct ev_check *w)
		1389	{
		1390	ev_clear_pending (EV_A_ (W)w);
		1391	if (ev_is_active (w))
		1392	return;
		1393
		1394	checks [((W)w)->active - 1] = checks [--checkcnt];
		1395	ev_stop (EV_A_ (W)w);
		1396	}
		1397
		1398	#ifndef SA_RESTART
		1399	# define SA_RESTART 0
		1400	#endif
		1401
		1402	void
		1403	ev_signal_start (EV_P_ struct ev_signal *w)
		1404	{
		1405	#if EV_MULTIPLICITY
		1406	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1407	#endif
		1408	if (ev_is_active (w))
		1409	return;
		1410
		1411	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1412
		1413	ev_start (EV_A_ (W)w, 1);
		1414	array_needsize (signals, signalmax, w->signum, signals_init);
		1415	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1416
		1417	if (!((WL)w)->next)
		1418	{
		1419	#if WIN32
		1420	signal (w->signum, sighandler);
		1421	#else
		1422	struct sigaction sa;
		1423	sa.sa_handler = sighandler;
		1424	sigfillset (&sa.sa_mask);
		1425	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1426	sigaction (w->signum, &sa, 0);
		1427	#endif
		1428	}
		1429	}
		1430
		1431	void
		1432	ev_signal_stop (EV_P_ struct ev_signal *w)
		1433	{
		1434	ev_clear_pending (EV_A_ (W)w);
		1435	if (!ev_is_active (w))
		1436	return;
		1437
		1438	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1439	ev_stop (EV_A_ (W)w);
		1440
		1441	if (!signals [w->signum - 1].head)
		1442	signal (w->signum, SIG_DFL);
		1443	}
		1444
		1445	void
		1446	ev_child_start (EV_P_ struct ev_child *w)
		1447	{
		1448	#if EV_MULTIPLICITY
		1449	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1450	#endif
		1451	if (ev_is_active (w))
		1452	return;
		1453
		1454	ev_start (EV_A_ (W)w, 1);
		1455	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1456	}
		1457
		1458	void
		1459	ev_child_stop (EV_P_ struct ev_child *w)
		1460	{
		1461	ev_clear_pending (EV_A_ (W)w);
		1462	if (ev_is_active (w))
		1463	return;
		1464
		1465	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1466	ev_stop (EV_A_ (W)w);
		1467	}
		1468
		1469	/*****************************************************************************/
		1470
		1471	struct ev_once
		1472	{
		1473	struct ev_io io;
		1474	struct ev_timer to;
		1475	void (*cb)(int revents, void *arg);
		1476	void *arg;
		1477	};
		1478
		1479	static void
		1480	once_cb (EV_P_ struct ev_once *once, int revents)
		1481	{
		1482	void (*cb)(int revents, void *arg) = once->cb;
		1483	void *arg = once->arg;
		1484
		1485	ev_io_stop (EV_A_ &once->io);
		1486	ev_timer_stop (EV_A_ &once->to);
		1487	ev_free (once);
		1488
		1489	cb (revents, arg);
		1490	}
		1491
		1492	static void
		1493	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1494	{
		1495	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1496	}
		1497
		1498	static void
		1499	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1500	{
		1501	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1502	}
		1503
		1504	void
		1505	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1506	{
		1507	struct ev_once *once = ev_malloc (sizeof (struct ev_once));
		1508
		1509	if (!once)
		1510	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
495	else	1511	else
496	{	1512	{
497	w->at += now;	1513	once->cb = cb;
		1514	once->arg = arg;
498		1515
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1516	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1517	if (fd >= 0)
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}
504
505	}
506
507	void
508	evtimer_stop (struct ev_timer *w)
509	{
510	if (!ev_is_active (w))
511	return;
512
513	if (w->is_abs)
514	{
515	if (w->active < atimercnt--)
516	{	1518	{
517	atimers [w->active - 1] = atimers [atimercnt];	1519	ev_io_set (&once->io, fd, events);
518	downheap (atimers, atimercnt, w->active - 1);	1520	ev_io_start (EV_A_ &once->io);
519	}	1521	}
520	}	1522
521	else	1523	ev_watcher_init (&once->to, once_cb_to);
522	{	1524	if (timeout >= 0.)
523	if (w->active < rtimercnt--)
524	{	1525	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1526	ev_timer_set (&once->to, timeout, 0.);
526	downheap (rtimers, rtimercnt, w->active - 1);	1527	ev_timer_start (EV_A_ &once->to);
527	}	1528	}
528	}	1529	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1530	}
532		1531
533	void
534	evsignal_start (struct ev_signal *w)
535	{
536	if (ev_is_active (w))
537	return;
538
539	ev_start ((struct ev_watcher *)w, 1);
540	array_needsize (signals, signalmax, w->signum, signals_init);
541	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
542	}
543
544	void
545	evsignal_stop (struct ev_signal *w)
546	{
547	if (!ev_is_active (w))
548	return;
549
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
551	ev_stop ((struct ev_watcher *)w);
552	}
553
554	/*****************************************************************************/
555	#if 1
556
557	static void
558	sin_cb (struct ev_io *w, int revents)
559	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
561	}
562
563	static void
564	ocb (struct ev_timer *w, int revents)
565	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
567	evtimer_stop (w);
568	evtimer_start (w);
569	}
570
571	int main (void)
572	{
573	struct ev_io sin;
574
575	ev_init (0);
576
577	evw_init (&sin, sin_cb, 55);
578	evio_set (&sin, 0, EV_READ);
579	evio_start (&sin);
580
581	struct ev_timer t[10000];
582
583	#if 1
584	int i;
585	for (i = 0; i < 10000; ++i)
586	{
587	struct ev_timer *w = t + i;
588	evw_init (w, ocb, i);
589	evtimer_set_abs (w, drand48 (), 0.99775533);
590	evtimer_start (w);
591	if (drand48 () < 0.5)
592	evtimer_stop (w);
593	}
594	#endif
595
596	struct ev_timer t1;
597	evw_init (&t1, ocb, 0);
598	evtimer_set_abs (&t1, 5, 10);
599	evtimer_start (&t1);
600
601	ev_loop (0);
602
603	return 0;
604	}
605
606	#endif
607
608
609
610

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