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Comparing libev/ev.c (file contents):
Revision 1.5 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.78 by root, Thu Nov 8 21:08:56 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	#include <signal.h>
		70
		71	#ifndef WIN32
		72	# include <unistd.h>
		73	# include <sys/time.h>
		74	# include <sys/wait.h>
		75	#endif
		76	/**/
		77
		78	#ifndef EV_USE_MONOTONIC
		79	# define EV_USE_MONOTONIC 1
		80	#endif
		81
		82	#ifndef EV_USE_SELECT
		83	# define EV_USE_SELECT 1
		84	#endif
		85
		86	#ifndef EV_USE_POLL
		87	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		88	#endif
		89
		90	#ifndef EV_USE_EPOLL
		91	# define EV_USE_EPOLL 0
		92	#endif
		93
		94	#ifndef EV_USE_KQUEUE
		95	# define EV_USE_KQUEUE 0
		96	#endif
		97
		98	#ifndef EV_USE_WIN32
		99	# ifdef WIN32
		100	# define EV_USE_WIN32 0 /* it does not exist, use select */
		101	# undef EV_USE_SELECT
		102	# define EV_USE_SELECT 1
		103	# else
		104	# define EV_USE_WIN32 0
		105	# endif
		106	#endif
		107
		108	#ifndef EV_USE_REALTIME
		109	# define EV_USE_REALTIME 1
		110	#endif
		111
		112	/**/
		113
11	#ifdef CLOCK_MONOTONIC	114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	116	# define EV_USE_MONOTONIC 0
13	#endif	117	#endif
14		118
15	#define HAVE_EPOLL 1	119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
16	#define HAVE_REALTIME 1	121	# define EV_USE_REALTIME 0
17	#define HAVE_SELECT 1	122	#endif
		123
		124	/**/
18		125
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	126	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	127	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		128	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		129	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
21		130
22	#include "ev.h"	131	#include "ev.h"
23		132
		133	#if __GNUC__ >= 3
		134	# define expect(expr,value) __builtin_expect ((expr),(value))
		135	# define inline inline
		136	#else
		137	# define expect(expr,value) (expr)
		138	# define inline static
		139	#endif
		140
		141	#define expect_false(expr) expect ((expr) != 0, 0)
		142	#define expect_true(expr) expect ((expr) != 0, 1)
		143
		144	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		145	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		146
24	struct ev_watcher {	147	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);	148	typedef struct ev_watcher_list *WL;
		149	typedef struct ev_watcher_time *WT;
		150
		151	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		152
		153	#include "ev_win32.c"
		154
		155	/*****************************************************************************/
		156
		157	static void (*syserr_cb)(const char *msg);
		158
		159	void ev_set_syserr_cb (void (*cb)(const char *msg))
		160	{
		161	syserr_cb = cb;
		162	}
		163
		164	static void
		165	syserr (const char *msg)
		166	{
		167	if (!msg)
		168	msg = "(libev) system error";
		169
		170	if (syserr_cb)
		171	syserr_cb (msg);
		172	else
		173	{
		174	perror (msg);
		175	abort ();
		176	}
		177	}
		178
		179	static void *(*alloc)(void *ptr, long size);
		180
		181	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		182	{
		183	alloc = cb;
		184	}
		185
		186	static void *
		187	ev_realloc (void *ptr, long size)
		188	{
		189	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		190
		191	if (!ptr && size)
		192	{
		193	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		194	abort ();
		195	}
		196
		197	return ptr;
		198	}
		199
		200	#define ev_malloc(size) ev_realloc (0, (size))
		201	#define ev_free(ptr) ev_realloc ((ptr), 0)
		202
		203	/*****************************************************************************/
		204
		205	typedef struct
		206	{
		207	WL head;
		208	unsigned char events;
		209	unsigned char reify;
		210	} ANFD;
		211
		212	typedef struct
		213	{
		214	W w;
		215	int events;
		216	} ANPENDING;
		217
		218	#if EV_MULTIPLICITY
		219
		220	struct ev_loop
		221	{
		222	# define VAR(name,decl) decl;
		223	# include "ev_vars.h"
26	};	224	};
		225	# undef VAR
		226	# include "ev_wrap.h"
27		227
28	struct ev_watcher_list {	228	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		229
32	static ev_tstamp now, diff; /* monotonic clock */	230	# define VAR(name,decl) static decl;
33	ev_tstamp ev_now;	231	# include "ev_vars.h"
34	int ev_method;	232	# undef VAR
35		233
36	static int have_monotonic; /* runtime */	234	#endif
37		235
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	236	/*****************************************************************************/
39	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);
41		237
42	ev_tstamp	238	inline ev_tstamp
43	ev_time (void)	239	ev_time (void)
44	{	240	{
45	#if HAVE_REALTIME	241	#if EV_USE_REALTIME
46	struct timespec ts;	242	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	243	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	244	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	245	#else
50	struct timeval tv;	246	struct timeval tv;
51	gettimeofday (&tv, 0);	247	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	248	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	249	#endif
54	}	250	}
55		251
56	static ev_tstamp	252	inline ev_tstamp
57	get_clock (void)	253	get_clock (void)
58	{	254	{
59	#if HAVE_MONOTONIC	255	#if EV_USE_MONOTONIC
60	if (have_monotonic)	256	if (expect_true (have_monotonic))
61	{	257	{
62	struct timespec ts;	258	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	259	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	260	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	261	}
66	#endif	262	#endif
67		263
68	return ev_time ();	264	return ev_time ();
69	}	265	}
70		266
		267	ev_tstamp
		268	ev_now (EV_P)
		269	{
		270	return rt_now;
		271	}
		272
		273	#define array_roundsize(type,n) ((n) | 4 & ~3)
		274
71	#define array_needsize(base,cur,cnt,init) \	275	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	276	if (expect_false ((cnt) > cur)) \
73	{ \	277	{ \
74	int newcnt = cur ? cur << 1 : 16; \	278	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	279	do \
		280	{ \
		281	newcnt = array_roundsize (type, newcnt << 1); \
		282	} \
		283	while ((cnt) > newcnt); \
		284	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	285	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
77	init (base + cur, newcnt - cur); \	286	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	287	cur = newcnt; \
79	}	288	}
80		289
81	typedef struct	290	#define array_slim(type,stem) \
82	{	291	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	292	{ \
84	unsigned char wev, rev; /* want, received event set */	293	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	294	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		295	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		296	}
86		297
87	static ANFD *anfds;	298	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
88	static int anfdmax;	299	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		300	#define array_free_microshit(stem) \
		301	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
89		302
90	static int *fdchanges;	303	#define array_free(stem, idx) \
91	static int fdchangemax, fdchangecnt;	304	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		305
		306	/*****************************************************************************/
92		307
93	static void	308	static void
94	anfds_init (ANFD *base, int count)	309	anfds_init (ANFD *base, int count)
95	{	310	{
96	while (count--)	311	while (count--)
97	{	312	{
98	base->head = 0;	313	base->head = 0;
99	base->wev = base->rev = EV_NONE;	314	base->events = EV_NONE;
		315	base->reify = 0;
		316
100	++base;	317	++base;
101	}	318	}
102	}	319	}
103		320
104	typedef struct	321	void
		322	ev_feed_event (EV_P_ void *w, int revents)
105	{	323	{
106	struct ev_watcher *w;	324	W w_ = (W)w;
107	int events;
108	} ANPENDING;
109		325
110	static ANPENDING *pendings;	326	if (w_->pending)
111	static int pendingmax, pendingcnt;	327	{
		328	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		329	return;
		330	}
112		331
113	static void
114	event (struct ev_watcher *w, int events)
115	{
116	w->pending = ++pendingcnt;	332	w_->pending = ++pendingcnt [ABSPRI (w_)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	333	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
118	pendings [pendingcnt - 1].w = w;	334	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
119	pendings [pendingcnt - 1].events = events;	335	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
120	}	336	}
121		337
122	static void	338	static void
		339	queue_events (EV_P_ W *events, int eventcnt, int type)
		340	{
		341	int i;
		342
		343	for (i = 0; i < eventcnt; ++i)
		344	ev_feed_event (EV_A_ events [i], type);
		345	}
		346
		347	static void
123	fd_event (int fd, int events)	348	fd_event (EV_P_ int fd, int events)
124	{	349	{
125	ANFD *anfd = anfds + fd;	350	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	351	struct ev_io *w;
127		352
128	for (w = anfd->head; w; w = w->next)	353	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	354	{
130	int ev = w->events & events;	355	int ev = w->events & events;
131		356
132	if (ev)	357	if (ev)
133	event ((struct ev_watcher *)w, ev);	358	ev_feed_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	{	359	}
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	}	360	}
159		361
160	static void	362	/*****************************************************************************/
161	downheap (struct ev_timer **timers, int N, int k)
162	{
163	struct ev_timer *w = timers [k];
164		363
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	364	static void
188	signals_init (struct ev_signal **base, int count)	365	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	{	366	{
247	int i;	367	int i;
248		368
249	for (i = 0; i < fdchangecnt; ++i)	369	for (i = 0; i < fdchangecnt; ++i)
250	{	370	{
251	int fd = fdchanges [i];	371	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	372	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	373	struct ev_io *w;
254		374
255	int wev = 0;	375	int events = 0;
256		376
257	for (w = anfd->head; w; w = w->next)	377	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	378	events |= w->events;
259		379
260	if (anfd->wev != wev)	380	anfd->reify = 0;
		381
		382	method_modify (EV_A_ fd, anfd->events, events);
		383	anfd->events = events;
		384	}
		385
		386	fdchangecnt = 0;
		387	}
		388
		389	static void
		390	fd_change (EV_P_ int fd)
		391	{
		392	if (anfds [fd].reify)
		393	return;
		394
		395	anfds [fd].reify = 1;
		396
		397	++fdchangecnt;
		398	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		399	fdchanges [fdchangecnt - 1] = fd;
		400	}
		401
		402	static void
		403	fd_kill (EV_P_ int fd)
		404	{
		405	struct ev_io *w;
		406
		407	while ((w = (struct ev_io *)anfds [fd].head))
		408	{
		409	ev_io_stop (EV_A_ w);
		410	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		411	}
		412	}
		413
		414	static int
		415	fd_valid (int fd)
		416	{
		417	#ifdef WIN32
		418	return !!win32_get_osfhandle (fd);
		419	#else
		420	return fcntl (fd, F_GETFD) != -1;
		421	#endif
		422	}
		423
		424	/* called on EBADF to verify fds */
		425	static void
		426	fd_ebadf (EV_P)
		427	{
		428	int fd;
		429
		430	for (fd = 0; fd < anfdmax; ++fd)
		431	if (anfds [fd].events)
		432	if (!fd_valid (fd) == -1 && errno == EBADF)
		433	fd_kill (EV_A_ fd);
		434	}
		435
		436	/* called on ENOMEM in select/poll to kill some fds and retry */
		437	static void
		438	fd_enomem (EV_P)
		439	{
		440	int fd;
		441
		442	for (fd = anfdmax; fd--; )
		443	if (anfds [fd].events)
		444	{
		445	fd_kill (EV_A_ fd);
		446	return;
		447	}
		448	}
		449
		450	/* usually called after fork if method needs to re-arm all fds from scratch */
		451	static void
		452	fd_rearm_all (EV_P)
		453	{
		454	int fd;
		455
		456	/* this should be highly optimised to not do anything but set a flag */
		457	for (fd = 0; fd < anfdmax; ++fd)
		458	if (anfds [fd].events)
		459	{
		460	anfds [fd].events = 0;
		461	fd_change (EV_A_ fd);
		462	}
		463	}
		464
		465	/*****************************************************************************/
		466
		467	static void
		468	upheap (WT *heap, int k)
		469	{
		470	WT w = heap [k];
		471
		472	while (k && heap [k >> 1]->at > w->at)
		473	{
		474	heap [k] = heap [k >> 1];
		475	((W)heap [k])->active = k + 1;
		476	k >>= 1;
		477	}
		478
		479	heap [k] = w;
		480	((W)heap [k])->active = k + 1;
		481
		482	}
		483
		484	static void
		485	downheap (WT *heap, int N, int k)
		486	{
		487	WT w = heap [k];
		488
		489	while (k < (N >> 1))
		490	{
		491	int j = k << 1;
		492
		493	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		494	++j;
		495
		496	if (w->at <= heap [j]->at)
		497	break;
		498
		499	heap [k] = heap [j];
		500	((W)heap [k])->active = k + 1;
		501	k = j;
		502	}
		503
		504	heap [k] = w;
		505	((W)heap [k])->active = k + 1;
		506	}
		507
		508	/*****************************************************************************/
		509
		510	typedef struct
		511	{
		512	WL head;
		513	sig_atomic_t volatile gotsig;
		514	} ANSIG;
		515
		516	static ANSIG *signals;
		517	static int signalmax;
		518
		519	static int sigpipe [2];
		520	static sig_atomic_t volatile gotsig;
		521	static struct ev_io sigev;
		522
		523	static void
		524	signals_init (ANSIG *base, int count)
		525	{
		526	while (count--)
		527	{
		528	base->head = 0;
		529	base->gotsig = 0;
		530
		531	++base;
		532	}
		533	}
		534
		535	static void
		536	sighandler (int signum)
		537	{
		538	#if WIN32
		539	signal (signum, sighandler);
		540	#endif
		541
		542	signals [signum - 1].gotsig = 1;
		543
		544	if (!gotsig)
		545	{
		546	int old_errno = errno;
		547	gotsig = 1;
		548	#ifdef WIN32
		549	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		550	#else
		551	write (sigpipe [1], &signum, 1);
		552	#endif
		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	#ifdef WIN32
		564	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		565	#else
		566	read (sigpipe [0], &revents, 1);
		567	#endif
		568	gotsig = 0;
		569
		570	for (signum = signalmax; signum--; )
		571	if (signals [signum].gotsig)
		572	{
		573	signals [signum].gotsig = 0;
		574
		575	for (w = signals [signum].head; w; w = w->next)
		576	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		577	}
		578	}
		579
		580	static void
		581	siginit (EV_P)
		582	{
		583	#ifndef WIN32
		584	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		585	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		586
		587	/* rather than sort out wether we really need nb, set it */
		588	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		589	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		590	#endif
		591
		592	ev_io_set (&sigev, sigpipe [0], EV_READ);
		593	ev_io_start (EV_A_ &sigev);
		594	ev_unref (EV_A); /* child watcher should not keep loop alive */
		595	}
		596
		597	/*****************************************************************************/
		598
		599	static struct ev_child *childs [PID_HASHSIZE];
		600
		601	#ifndef WIN32
		602
		603	static struct ev_signal childev;
		604
		605	#ifndef WCONTINUED
		606	# define WCONTINUED 0
		607	#endif
		608
		609	static void
		610	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		611	{
		612	struct ev_child *w;
		613
		614	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		615	if (w->pid == pid || !w->pid)
		616	{
		617	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		618	w->rpid = pid;
		619	w->rstatus = status;
		620	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		621	}
		622	}
		623
		624	static void
		625	childcb (EV_P_ struct ev_signal *sw, int revents)
		626	{
		627	int pid, status;
		628
		629	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		630	{
		631	/* make sure we are called again until all childs have been reaped */
		632	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		633
		634	child_reap (EV_A_ sw, pid, pid, status);
		635	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		636	}
		637	}
		638
		639	#endif
		640
		641	/*****************************************************************************/
		642
		643	#if EV_USE_KQUEUE
		644	# include "ev_kqueue.c"
		645	#endif
		646	#if EV_USE_EPOLL
		647	# include "ev_epoll.c"
		648	#endif
		649	#if EV_USE_POLL
		650	# include "ev_poll.c"
		651	#endif
		652	#if EV_USE_SELECT
		653	# include "ev_select.c"
		654	#endif
		655
		656	int
		657	ev_version_major (void)
		658	{
		659	return EV_VERSION_MAJOR;
		660	}
		661
		662	int
		663	ev_version_minor (void)
		664	{
		665	return EV_VERSION_MINOR;
		666	}
		667
		668	/* return true if we are running with elevated privileges and should ignore env variables */
		669	static int
		670	enable_secure (void)
		671	{
		672	#ifdef WIN32
		673	return 0;
		674	#else
		675	return getuid () != geteuid ()
		676	|| getgid () != getegid ();
		677	#endif
		678	}
		679
		680	int
		681	ev_method (EV_P)
		682	{
		683	return method;
		684	}
		685
		686	static void
		687	loop_init (EV_P_ int methods)
		688	{
		689	if (!method)
		690	{
		691	#if EV_USE_MONOTONIC
		692	{
		693	struct timespec ts;
		694	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		695	have_monotonic = 1;
		696	}
		697	#endif
		698
		699	rt_now = ev_time ();
		700	mn_now = get_clock ();
		701	now_floor = mn_now;
		702	rtmn_diff = rt_now - mn_now;
		703
		704	if (methods == EVMETHOD_AUTO)
		705	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		706	methods = atoi (getenv ("LIBEV_METHODS"));
		707	else
		708	methods = EVMETHOD_ANY;
		709
		710	method = 0;
		711	#if EV_USE_WIN32
		712	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		713	#endif
		714	#if EV_USE_KQUEUE
		715	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		716	#endif
		717	#if EV_USE_EPOLL
		718	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		719	#endif
		720	#if EV_USE_POLL
		721	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		722	#endif
		723	#if EV_USE_SELECT
		724	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		725	#endif
		726
		727	ev_watcher_init (&sigev, sigcb);
		728	ev_set_priority (&sigev, EV_MAXPRI);
		729	}
		730	}
		731
		732	void
		733	loop_destroy (EV_P)
		734	{
		735	int i;
		736
		737	#if EV_USE_WIN32
		738	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		739	#endif
		740	#if EV_USE_KQUEUE
		741	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		742	#endif
		743	#if EV_USE_EPOLL
		744	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		745	#endif
		746	#if EV_USE_POLL
		747	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		748	#endif
		749	#if EV_USE_SELECT
		750	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		751	#endif
		752
		753	for (i = NUMPRI; i--; )
		754	array_free (pending, [i]);
		755
		756	/* have to use the microsoft-never-gets-it-right macro */
		757	array_free_microshit (fdchange);
		758	array_free_microshit (timer);
		759	array_free_microshit (periodic);
		760	array_free_microshit (idle);
		761	array_free_microshit (prepare);
		762	array_free_microshit (check);
		763
		764	method = 0;
		765	}
		766
		767	static void
		768	loop_fork (EV_P)
		769	{
		770	#if EV_USE_EPOLL
		771	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		772	#endif
		773	#if EV_USE_KQUEUE
		774	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		775	#endif
		776
		777	if (ev_is_active (&sigev))
		778	{
		779	/* default loop */
		780
		781	ev_ref (EV_A);
		782	ev_io_stop (EV_A_ &sigev);
		783	close (sigpipe [0]);
		784	close (sigpipe [1]);
		785
		786	while (pipe (sigpipe))
		787	syserr ("(libev) error creating pipe");
		788
		789	siginit (EV_A);
		790	}
		791
		792	postfork = 0;
		793	}
		794
		795	#if EV_MULTIPLICITY
		796	struct ev_loop *
		797	ev_loop_new (int methods)
		798	{
		799	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		800
		801	memset (loop, 0, sizeof (struct ev_loop));
		802
		803	loop_init (EV_A_ methods);
		804
		805	if (ev_method (EV_A))
		806	return loop;
		807
		808	return 0;
		809	}
		810
		811	void
		812	ev_loop_destroy (EV_P)
		813	{
		814	loop_destroy (EV_A);
		815	ev_free (loop);
		816	}
		817
		818	void
		819	ev_loop_fork (EV_P)
		820	{
		821	postfork = 1;
		822	}
		823
		824	#endif
		825
		826	#if EV_MULTIPLICITY
		827	struct ev_loop default_loop_struct;
		828	static struct ev_loop *default_loop;
		829
		830	struct ev_loop *
		831	#else
		832	static int default_loop;
		833
		834	int
		835	#endif
		836	ev_default_loop (int methods)
		837	{
		838	if (sigpipe [0] == sigpipe [1])
		839	if (pipe (sigpipe))
		840	return 0;
		841
		842	if (!default_loop)
		843	{
		844	#if EV_MULTIPLICITY
		845	struct ev_loop *loop = default_loop = &default_loop_struct;
		846	#else
		847	default_loop = 1;
		848	#endif
		849
		850	loop_init (EV_A_ methods);
		851
		852	if (ev_method (EV_A))
261	{	853	{
262	method_modify (fd, anfd->wev, wev);	854	siginit (EV_A);
263	anfd->wev = wev;	855
		856	#ifndef WIN32
		857	ev_signal_init (&childev, childcb, SIGCHLD);
		858	ev_set_priority (&childev, EV_MAXPRI);
		859	ev_signal_start (EV_A_ &childev);
		860	ev_unref (EV_A); /* child watcher should not keep loop alive */
		861	#endif
264	}	862	}
		863	else
		864	default_loop = 0;
265	}	865	}
266		866
267	fdchangecnt = 0;	867	return default_loop;
268	}	868	}
269		869
		870	void
		871	ev_default_destroy (void)
		872	{
		873	#if EV_MULTIPLICITY
		874	struct ev_loop *loop = default_loop;
		875	#endif
		876
		877	#ifndef WIN32
		878	ev_ref (EV_A); /* child watcher */
		879	ev_signal_stop (EV_A_ &childev);
		880	#endif
		881
		882	ev_ref (EV_A); /* signal watcher */
		883	ev_io_stop (EV_A_ &sigev);
		884
		885	close (sigpipe [0]); sigpipe [0] = 0;
		886	close (sigpipe [1]); sigpipe [1] = 0;
		887
		888	loop_destroy (EV_A);
		889	}
		890
		891	void
		892	ev_default_fork (void)
		893	{
		894	#if EV_MULTIPLICITY
		895	struct ev_loop *loop = default_loop;
		896	#endif
		897
		898	if (method)
		899	postfork = 1;
		900	}
		901
		902	/*****************************************************************************/
		903
270	static void	904	static int
271	call_pending ()	905	any_pending (EV_P)
272	{	906	{
273	int i;	907	int pri;
274		908
275	for (i = 0; i < pendingcnt; ++i)	909	for (pri = NUMPRI; pri--; )
		910	if (pendingcnt [pri])
		911	return 1;
		912
		913	return 0;
		914	}
		915
		916	static void
		917	call_pending (EV_P)
		918	{
		919	int pri;
		920
		921	for (pri = NUMPRI; pri--; )
		922	while (pendingcnt [pri])
276	{	923	{
277	ANPENDING *p = pendings + i;	924	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
278		925
279	if (p->w)	926	if (p->w)
280	{	927	{
281	p->w->pending = 0;	928	p->w->pending = 0;
282	p->w->cb (p->w, p->events);	929	p->w->cb (EV_A_ p->w, p->events);
283	}	930	}
284	}	931	}
285
286	pendingcnt = 0;
287	}	932	}
288		933
289	static void	934	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	935	timers_reify (EV_P)
291	{	936	{
292	while (timercnt && timers [0]->at <= now)	937	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	938	{
294	struct ev_timer *w = timers [0];	939	struct ev_timer *w = timers [0];
		940
		941	assert (("inactive timer on timer heap detected", ev_is_active (w)));
295		942
296	/* first reschedule or stop timer */	943	/* first reschedule or stop timer */
297	if (w->repeat)	944	if (w->repeat)
298	{	945	{
299	if (w->is_abs)	946	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;	947	((WT)w)->at = mn_now + w->repeat;
303
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	948	downheap ((WT *)timers, timercnt, 0);
307	}	949	}
308	else	950	else
		951	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		952
		953	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		954	}
		955	}
		956
		957	static void
		958	periodics_reify (EV_P)
		959	{
		960	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		961	{
		962	struct ev_periodic *w = periodics [0];
		963
		964	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		965
		966	/* first reschedule or stop timer */
		967	if (w->reschedule_cb)
309	{	968	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	969	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, rt_now + 0.0001);
311	--timercnt; /* maybe pass by reference instead? */	970
		971	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > rt_now));
		972	downheap ((WT *)periodics, periodiccnt, 0);
312	}	973	}
		974	else if (w->interval)
		975	{
		976	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		977	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		978	downheap ((WT *)periodics, periodiccnt, 0);
		979	}
		980	else
		981	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		982
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	983	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
315	}	984	}
316	}	985	}
317		986
318	static void	987	static void
319	time_update ()	988	periodics_reschedule (EV_P)
320	{	989	{
321	int i;	990	int i;
		991
		992	/* adjust periodics after time jump */
		993	for (i = 0; i < periodiccnt; ++i)
		994	{
		995	struct ev_periodic *w = periodics [i];
		996
		997	if (w->reschedule_cb)
		998	((WT)w)->at = w->reschedule_cb (w, rt_now);
		999	else if (w->interval)
		1000	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1001	}
		1002
		1003	/* now rebuild the heap */
		1004	for (i = periodiccnt >> 1; i--; )
		1005	downheap ((WT *)periodics, periodiccnt, i);
		1006	}
		1007
		1008	inline int
		1009	time_update_monotonic (EV_P)
		1010	{
		1011	mn_now = get_clock ();
		1012
		1013	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1014	{
		1015	rt_now = rtmn_diff + mn_now;
		1016	return 0;
		1017	}
		1018	else
		1019	{
		1020	now_floor = mn_now;
322	ev_now = ev_time ();	1021	rt_now = ev_time ();
323		1022	return 1;
324	if (have_monotonic)
325	{	1023	}
326	ev_tstamp odiff = diff;	1024	}
327		1025
328	/* detecting time jumps is much more difficult */	1026	static void
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1027	time_update (EV_P)
		1028	{
		1029	int i;
		1030
		1031	#if EV_USE_MONOTONIC
		1032	if (expect_true (have_monotonic))
		1033	{
		1034	if (time_update_monotonic (EV_A))
330	{	1035	{
331	now = get_clock ();	1036	ev_tstamp odiff = rtmn_diff;
		1037
		1038	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1039	{
332	diff = ev_now - now;	1040	rtmn_diff = rt_now - mn_now;
333		1041
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1042	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
335	return; /* all is well */	1043	return; /* all is well */
336		1044
337	ev_now = ev_time ();	1045	rt_now = ev_time ();
		1046	mn_now = get_clock ();
		1047	now_floor = mn_now;
		1048	}
		1049
		1050	periodics_reschedule (EV_A);
		1051	/* no timer adjustment, as the monotonic clock doesn't jump */
		1052	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
338	}	1053	}
		1054	}
		1055	else
		1056	#endif
		1057	{
		1058	rt_now = ev_time ();
339		1059
340	/* time jump detected, reschedule atimers */	1060	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
341	for (i = 0; i < atimercnt; ++i)
342	{	1061	{
343	struct ev_timer *w = atimers [i];	1062	periodics_reschedule (EV_A);
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1063
		1064	/* adjust timers. this is easy, as the offset is the same for all */
		1065	for (i = 0; i < timercnt; ++i)
		1066	((WT)timers [i])->at += rt_now - mn_now;
345	}	1067	}
346	}
347	else
348	{
349	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
350	/* time jump detected, adjust rtimers */
351	for (i = 0; i < rtimercnt; ++i)
352	rtimers [i]->at += ev_now - now;
353		1068
354	now = ev_now;	1069	mn_now = rt_now;
355	}	1070	}
356	}	1071	}
357		1072
358	int ev_loop_done;	1073	void
		1074	ev_ref (EV_P)
		1075	{
		1076	++activecnt;
		1077	}
359		1078
		1079	void
		1080	ev_unref (EV_P)
		1081	{
		1082	--activecnt;
		1083	}
		1084
		1085	static int loop_done;
		1086
		1087	void
360	void ev_loop (int flags)	1088	ev_loop (EV_P_ int flags)
361	{	1089	{
362	double block;	1090	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1091	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		1092
365	do	1093	do
366	{	1094	{
		1095	/* queue check watchers (and execute them) */
		1096	if (expect_false (preparecnt))
		1097	{
		1098	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1099	call_pending (EV_A);
		1100	}
		1101
		1102	/* we might have forked, so reify kernel state if necessary */
		1103	if (expect_false (postfork))
		1104	loop_fork (EV_A);
		1105
367	/* update fd-related kernel structures */	1106	/* update fd-related kernel structures */
368	fd_reify ();	1107	fd_reify (EV_A);
369		1108
370	/* calculate blocking time */	1109	/* calculate blocking time */
		1110
		1111	/* we only need this for !monotonic clock or timers, but as we basically
		1112	always have timers, we just calculate it always */
		1113	#if EV_USE_MONOTONIC
		1114	if (expect_true (have_monotonic))
		1115	time_update_monotonic (EV_A);
		1116	else
		1117	#endif
		1118	{
		1119	rt_now = ev_time ();
		1120	mn_now = rt_now;
		1121	}
		1122
371	if (flags & EVLOOP_NONBLOCK)	1123	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	1124	block = 0.;
373	else	1125	else
374	{	1126	{
375	block = MAX_BLOCKTIME;	1127	block = MAX_BLOCKTIME;
376		1128
377	if (rtimercnt)	1129	if (timercnt)
378	{	1130	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1131	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
380	if (block > to) block = to;	1132	if (block > to) block = to;
381	}	1133	}
382		1134
383	if (atimercnt)	1135	if (periodiccnt)
384	{	1136	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1137	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
386	if (block > to) block = to;	1138	if (block > to) block = to;
387	}	1139	}
388		1140
389	if (block < 0.) block = 0.;	1141	if (block < 0.) block = 0.;
390	}	1142	}
391		1143
392	method_poll (block);	1144	method_poll (EV_A_ block);
393		1145
394	/* update ev_now, do magic */	1146	/* update rt_now, do magic */
395	time_update ();	1147	time_update (EV_A);
396		1148
397	/* put pending timers into pendign queue and reschedule them */	1149	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1150	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1151	periodics_reify (EV_A); /* absolute timers called first */
400	/* relative timers second */
401	timers_reify (rtimers, rtimercnt, now);
402		1152
		1153	/* queue idle watchers unless io or timers are pending */
		1154	if (idlecnt && !any_pending (EV_A))
		1155	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1156
		1157	/* queue check watchers, to be executed first */
		1158	if (checkcnt)
		1159	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1160
403	call_pending ();	1161	call_pending (EV_A);
404	}	1162	}
405	while (!ev_loop_done);	1163	while (activecnt && !loop_done);
406	}
407		1164
408	static void	1165	if (loop_done != 2)
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1166	loop_done = 0;
		1167	}
		1168
		1169	void
		1170	ev_unloop (EV_P_ int how)
		1171	{
		1172	loop_done = how;
		1173	}
		1174
		1175	/*****************************************************************************/
		1176
		1177	inline void
		1178	wlist_add (WL *head, WL elem)
410	{	1179	{
411	elem->next = *head;	1180	elem->next = *head;
412	*head = elem;	1181	*head = elem;
413	}	1182	}
414		1183
415	static void	1184	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1185	wlist_del (WL *head, WL elem)
417	{	1186	{
418	while (*head)	1187	while (*head)
419	{	1188	{
420	if (*head == elem)	1189	if (*head == elem)
421	{	1190	{
…		…
425		1194
426	head = &(*head)->next;	1195	head = &(*head)->next;
427	}	1196	}
428	}	1197	}
429		1198
430	static void	1199	inline void
431	ev_start (struct ev_watcher *w, int active)	1200	ev_clear_pending (EV_P_ W w)
432	{	1201	{
		1202	if (w->pending)
		1203	{
		1204	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1205	w->pending = 0;
		1206	}
		1207	}
		1208
		1209	inline void
		1210	ev_start (EV_P_ W w, int active)
		1211	{
		1212	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1213	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1214
434	w->active = active;	1215	w->active = active;
		1216	ev_ref (EV_A);
435	}	1217	}
436		1218
437	static void	1219	inline void
438	ev_stop (struct ev_watcher *w)	1220	ev_stop (EV_P_ W w)
439	{	1221	{
440	if (w->pending)	1222	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1223	w->active = 0;
444	/* nop */
445	}	1224	}
446		1225
		1226	/*****************************************************************************/
		1227
447	void	1228	void
448	evio_start (struct ev_io *w)	1229	ev_io_start (EV_P_ struct ev_io *w)
449	{	1230	{
		1231	int fd = w->fd;
		1232
450	if (ev_is_active (w))	1233	if (ev_is_active (w))
451	return;	1234	return;
452		1235
453	int fd = w->fd;	1236	assert (("ev_io_start called with negative fd", fd >= 0));
454		1237
455	ev_start ((struct ev_watcher *)w, 1);	1238	ev_start (EV_A_ (W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1239	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1240	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		1241
459	++fdchangecnt;	1242	fd_change (EV_A_ fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1243	}
463		1244
464	void	1245	void
465	evio_stop (struct ev_io *w)	1246	ev_io_stop (EV_P_ struct ev_io *w)
466	{	1247	{
		1248	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1249	if (!ev_is_active (w))
468	return;	1250	return;
469		1251
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1252	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	1253	ev_stop (EV_A_ (W)w);
472		1254
473	++fdchangecnt;	1255	fd_change (EV_A_ w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	1256	}
477		1257
478	void	1258	void
479	evtimer_start (struct ev_timer *w)	1259	ev_timer_start (EV_P_ struct ev_timer *w)
480	{	1260	{
481	if (ev_is_active (w))	1261	if (ev_is_active (w))
482	return;	1262	return;
483		1263
484	if (w->is_abs)	1264	((WT)w)->at += mn_now;
		1265
		1266	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1267
		1268	ev_start (EV_A_ (W)w, ++timercnt);
		1269	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1270	timers [timercnt - 1] = w;
		1271	upheap ((WT *)timers, timercnt - 1);
		1272
		1273	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1274	}
		1275
		1276	void
		1277	ev_timer_stop (EV_P_ struct ev_timer *w)
		1278	{
		1279	ev_clear_pending (EV_A_ (W)w);
		1280	if (!ev_is_active (w))
		1281	return;
		1282
		1283	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1284
		1285	if (((W)w)->active < timercnt--)
		1286	{
		1287	timers [((W)w)->active - 1] = timers [timercnt];
		1288	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
485	{	1289	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1290
		1291	((WT)w)->at = w->repeat;
		1292
		1293	ev_stop (EV_A_ (W)w);
		1294	}
		1295
		1296	void
		1297	ev_timer_again (EV_P_ struct ev_timer *w)
		1298	{
		1299	if (ev_is_active (w))
		1300	{
487	if (w->repeat)	1301	if (w->repeat)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1302	{
		1303	((WT)w)->at = mn_now + w->repeat;
		1304	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1305	}
		1306	else
		1307	ev_timer_stop (EV_A_ w);
		1308	}
		1309	else if (w->repeat)
		1310	ev_timer_start (EV_A_ w);
		1311	}
489		1312
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	1313	void
491	array_needsize (atimers, atimermax, atimercnt, );	1314	ev_periodic_start (EV_P_ struct ev_periodic *w)
492	atimers [atimercnt - 1] = w;	1315	{
493	upheap (atimers, atimercnt - 1);	1316	if (ev_is_active (w))
		1317	return;
		1318
		1319	if (w->reschedule_cb)
		1320	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1321	else if (w->interval)
494	}	1322	{
		1323	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1324	/* this formula differs from the one in periodic_reify because we do not always round up */
		1325	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1326	}
		1327
		1328	ev_start (EV_A_ (W)w, ++periodiccnt);
		1329	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1330	periodics [periodiccnt - 1] = w;
		1331	upheap ((WT *)periodics, periodiccnt - 1);
		1332
		1333	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1334	}
		1335
		1336	void
		1337	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1338	{
		1339	ev_clear_pending (EV_A_ (W)w);
		1340	if (!ev_is_active (w))
		1341	return;
		1342
		1343	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1344
		1345	if (((W)w)->active < periodiccnt--)
		1346	{
		1347	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1348	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1349	}
		1350
		1351	ev_stop (EV_A_ (W)w);
		1352	}
		1353
		1354	void
		1355	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1356	{
		1357	ev_periodic_stop (EV_A_ w);
		1358	ev_periodic_start (EV_A_ w);
		1359	}
		1360
		1361	void
		1362	ev_idle_start (EV_P_ struct ev_idle *w)
		1363	{
		1364	if (ev_is_active (w))
		1365	return;
		1366
		1367	ev_start (EV_A_ (W)w, ++idlecnt);
		1368	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1369	idles [idlecnt - 1] = w;
		1370	}
		1371
		1372	void
		1373	ev_idle_stop (EV_P_ struct ev_idle *w)
		1374	{
		1375	ev_clear_pending (EV_A_ (W)w);
		1376	if (ev_is_active (w))
		1377	return;
		1378
		1379	idles [((W)w)->active - 1] = idles [--idlecnt];
		1380	ev_stop (EV_A_ (W)w);
		1381	}
		1382
		1383	void
		1384	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1385	{
		1386	if (ev_is_active (w))
		1387	return;
		1388
		1389	ev_start (EV_A_ (W)w, ++preparecnt);
		1390	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1391	prepares [preparecnt - 1] = w;
		1392	}
		1393
		1394	void
		1395	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1396	{
		1397	ev_clear_pending (EV_A_ (W)w);
		1398	if (ev_is_active (w))
		1399	return;
		1400
		1401	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1402	ev_stop (EV_A_ (W)w);
		1403	}
		1404
		1405	void
		1406	ev_check_start (EV_P_ struct ev_check *w)
		1407	{
		1408	if (ev_is_active (w))
		1409	return;
		1410
		1411	ev_start (EV_A_ (W)w, ++checkcnt);
		1412	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1413	checks [checkcnt - 1] = w;
		1414	}
		1415
		1416	void
		1417	ev_check_stop (EV_P_ struct ev_check *w)
		1418	{
		1419	ev_clear_pending (EV_A_ (W)w);
		1420	if (ev_is_active (w))
		1421	return;
		1422
		1423	checks [((W)w)->active - 1] = checks [--checkcnt];
		1424	ev_stop (EV_A_ (W)w);
		1425	}
		1426
		1427	#ifndef SA_RESTART
		1428	# define SA_RESTART 0
		1429	#endif
		1430
		1431	void
		1432	ev_signal_start (EV_P_ struct ev_signal *w)
		1433	{
		1434	#if EV_MULTIPLICITY
		1435	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1436	#endif
		1437	if (ev_is_active (w))
		1438	return;
		1439
		1440	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1441
		1442	ev_start (EV_A_ (W)w, 1);
		1443	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1444	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1445
		1446	if (!((WL)w)->next)
		1447	{
		1448	#if WIN32
		1449	signal (w->signum, sighandler);
		1450	#else
		1451	struct sigaction sa;
		1452	sa.sa_handler = sighandler;
		1453	sigfillset (&sa.sa_mask);
		1454	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1455	sigaction (w->signum, &sa, 0);
		1456	#endif
		1457	}
		1458	}
		1459
		1460	void
		1461	ev_signal_stop (EV_P_ struct ev_signal *w)
		1462	{
		1463	ev_clear_pending (EV_A_ (W)w);
		1464	if (!ev_is_active (w))
		1465	return;
		1466
		1467	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1468	ev_stop (EV_A_ (W)w);
		1469
		1470	if (!signals [w->signum - 1].head)
		1471	signal (w->signum, SIG_DFL);
		1472	}
		1473
		1474	void
		1475	ev_child_start (EV_P_ struct ev_child *w)
		1476	{
		1477	#if EV_MULTIPLICITY
		1478	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1479	#endif
		1480	if (ev_is_active (w))
		1481	return;
		1482
		1483	ev_start (EV_A_ (W)w, 1);
		1484	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1485	}
		1486
		1487	void
		1488	ev_child_stop (EV_P_ struct ev_child *w)
		1489	{
		1490	ev_clear_pending (EV_A_ (W)w);
		1491	if (ev_is_active (w))
		1492	return;
		1493
		1494	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1495	ev_stop (EV_A_ (W)w);
		1496	}
		1497
		1498	/*****************************************************************************/
		1499
		1500	struct ev_once
		1501	{
		1502	struct ev_io io;
		1503	struct ev_timer to;
		1504	void (*cb)(int revents, void *arg);
		1505	void *arg;
		1506	};
		1507
		1508	static void
		1509	once_cb (EV_P_ struct ev_once *once, int revents)
		1510	{
		1511	void (*cb)(int revents, void *arg) = once->cb;
		1512	void *arg = once->arg;
		1513
		1514	ev_io_stop (EV_A_ &once->io);
		1515	ev_timer_stop (EV_A_ &once->to);
		1516	ev_free (once);
		1517
		1518	cb (revents, arg);
		1519	}
		1520
		1521	static void
		1522	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1523	{
		1524	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1525	}
		1526
		1527	static void
		1528	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1529	{
		1530	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1531	}
		1532
		1533	void
		1534	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1535	{
		1536	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1537
		1538	if (!once)
		1539	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
495	else	1540	else
496	{	1541	{
497	w->at += now;	1542	once->cb = cb;
		1543	once->arg = arg;
498		1544
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1545	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1546	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	{	1547	{
517	atimers [w->active - 1] = atimers [atimercnt];	1548	ev_io_set (&once->io, fd, events);
518	downheap (atimers, atimercnt, w->active - 1);	1549	ev_io_start (EV_A_ &once->io);
519	}	1550	}
520	}	1551
521	else	1552	ev_watcher_init (&once->to, once_cb_to);
522	{	1553	if (timeout >= 0.)
523	if (w->active < rtimercnt--)
524	{	1554	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1555	ev_timer_set (&once->to, timeout, 0.);
526	downheap (rtimers, rtimercnt, w->active - 1);	1556	ev_timer_start (EV_A_ &once->to);
527	}	1557	}
528	}	1558	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1559	}
532		1560
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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