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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 1.98 by root, Sun Nov 11 02:05:20 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
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# include "config.h"
		38
		39	# if HAVE_CLOCK_GETTIME
		40	# ifndef EV_USE_MONOTONIC
		41	# define EV_USE_MONOTONIC 1
		42	# endif
		43	# ifndef EV_USE_REALTIME
		44	# define EV_USE_REALTIME 1
		45	# endif
		46	# endif
		47
		48	# if HAVE_SELECT && HAVE_SYS_SELECT_H && !defined (EV_USE_SELECT)
		49	# define EV_USE_SELECT 1
		50	# endif
		51
		52	# if HAVE_POLL && HAVE_POLL_H && !defined (EV_USE_POLL)
		53	# define EV_USE_POLL 1
		54	# endif
		55
		56	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H && !defined (EV_USE_EPOLL)
		57	# define EV_USE_EPOLL 1
		58	# endif
		59
		60	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H && !defined (EV_USE_KQUEUE)
		61	# define EV_USE_KQUEUE 1
		62	# endif
		63
		64	#endif
		65
1	#include <math.h>	66	#include <math.h>
2	#include <stdlib.h>	67	#include <stdlib.h>
		68	#include <fcntl.h>
		69	#include <stddef.h>
3		70
4	#include <stdio.h>	71	#include <stdio.h>
5		72
6	#include <assert.h>	73	#include <assert.h>
7	#include <errno.h>	74	#include <errno.h>
8	#include <sys/time.h>	75	#include <sys/types.h>
9	#include <time.h>	76	#include <time.h>
10		77
		78	#include <signal.h>
		79
		80	#ifndef WIN32
		81	# include <unistd.h>
		82	# include <sys/time.h>
		83	# include <sys/wait.h>
		84	#endif
		85	/**/
		86
		87	#ifndef EV_USE_MONOTONIC
		88	# define EV_USE_MONOTONIC 1
		89	#endif
		90
		91	#ifndef EV_USE_SELECT
		92	# define EV_USE_SELECT 1
		93	#endif
		94
		95	#ifndef EV_USE_POLL
		96	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		97	#endif
		98
		99	#ifndef EV_USE_EPOLL
		100	# define EV_USE_EPOLL 0
		101	#endif
		102
		103	#ifndef EV_USE_KQUEUE
		104	# define EV_USE_KQUEUE 0
		105	#endif
		106
		107	#ifndef EV_USE_WIN32
		108	# ifdef WIN32
		109	# define EV_USE_WIN32 0 /* it does not exist, use select */
		110	# undef EV_USE_SELECT
		111	# define EV_USE_SELECT 1
		112	# else
		113	# define EV_USE_WIN32 0
		114	# endif
		115	#endif
		116
		117	#ifndef EV_USE_REALTIME
		118	# define EV_USE_REALTIME 1
		119	#endif
		120
		121	/**/
		122
11	#ifdef CLOCK_MONOTONIC	123	#ifndef CLOCK_MONOTONIC
		124	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	125	# define EV_USE_MONOTONIC 0
13	#endif	126	#endif
14		127
		128	#ifndef CLOCK_REALTIME
		129	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	130	# define EV_USE_REALTIME 0
16	#define HAVE_EPOLL 1	131	#endif
17	#define HAVE_SELECT 1	132
		133	/**/
18		134
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	135	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	136	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		137	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		138	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
21		139
		140	#ifdef EV_H
		141	# include EV_H
		142	#else
22	#include "ev.h"	143	# include "ev.h"
		144	#endif
23		145
		146	#if __GNUC__ >= 3
		147	# define expect(expr,value) __builtin_expect ((expr),(value))
		148	# define inline inline
		149	#else
		150	# define expect(expr,value) (expr)
		151	# define inline static
		152	#endif
		153
		154	#define expect_false(expr) expect ((expr) != 0, 0)
		155	#define expect_true(expr) expect ((expr) != 0, 1)
		156
		157	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		158	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		159
24	struct ev_watcher {	160	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);
26	};
27
28	struct ev_watcher_list {	161	typedef struct ev_watcher_list *WL;
29	EV_WATCHER_LIST (ev_watcher_list);	162	typedef struct ev_watcher_time *WT;
30	};
31		163
32	static ev_tstamp now, diff; /* monotonic clock */	164	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		165
		166	#ifdef WIN32
		167	# include "ev_win32.c"
		168	#endif
		169
		170	/*****************************************************************************/
		171
		172	static void (*syserr_cb)(const char *msg);
		173
		174	void ev_set_syserr_cb (void (*cb)(const char *msg))
		175	{
		176	syserr_cb = cb;
		177	}
		178
		179	static void
		180	syserr (const char *msg)
		181	{
		182	if (!msg)
		183	msg = "(libev) system error";
		184
		185	if (syserr_cb)
		186	syserr_cb (msg);
		187	else
		188	{
		189	perror (msg);
		190	abort ();
		191	}
		192	}
		193
		194	static void *(*alloc)(void *ptr, long size);
		195
		196	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		197	{
		198	alloc = cb;
		199	}
		200
		201	static void *
		202	ev_realloc (void *ptr, long size)
		203	{
		204	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		205
		206	if (!ptr && size)
		207	{
		208	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		209	abort ();
		210	}
		211
		212	return ptr;
		213	}
		214
		215	#define ev_malloc(size) ev_realloc (0, (size))
		216	#define ev_free(ptr) ev_realloc ((ptr), 0)
		217
		218	/*****************************************************************************/
		219
		220	typedef struct
		221	{
		222	WL head;
		223	unsigned char events;
		224	unsigned char reify;
		225	} ANFD;
		226
		227	typedef struct
		228	{
		229	W w;
		230	int events;
		231	} ANPENDING;
		232
		233	#if EV_MULTIPLICITY
		234
		235	struct ev_loop
		236	{
		237	ev_tstamp ev_rt_now;
		238	#define VAR(name,decl) decl;
		239	#include "ev_vars.h"
		240	#undef VAR
		241	};
		242	#include "ev_wrap.h"
		243
		244	struct ev_loop default_loop_struct;
		245	static struct ev_loop *default_loop;
		246
		247	#else
		248
33	ev_tstamp ev_now;	249	ev_tstamp ev_rt_now;
34	int ev_method;	250	#define VAR(name,decl) static decl;
		251	#include "ev_vars.h"
		252	#undef VAR
35		253
36	static int have_monotonic; /* runtime */	254	static int default_loop;
37		255
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	256	#endif
39	static void (*method_modify)(int fd, int oev, int nev);	257
40	static void (*method_poll)(ev_tstamp timeout);	258	/*****************************************************************************/
41		259
42	ev_tstamp	260	ev_tstamp
43	ev_time (void)	261	ev_time (void)
44	{	262	{
45	#if HAVE_REALTIME	263	#if EV_USE_REALTIME
46	struct timespec ts;	264	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	265	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	266	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	267	#else
50	struct timeval tv;	268	struct timeval tv;
51	gettimeofday (&tv, 0);	269	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	270	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	271	#endif
54	}	272	}
55		273
56	static ev_tstamp	274	inline ev_tstamp
57	get_clock (void)	275	get_clock (void)
58	{	276	{
59	#if HAVE_MONOTONIC	277	#if EV_USE_MONOTONIC
60	if (have_monotonic)	278	if (expect_true (have_monotonic))
61	{	279	{
62	struct timespec ts;	280	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	281	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	282	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	283	}
66	#endif	284	#endif
67		285
68	return ev_time ();	286	return ev_time ();
69	}	287	}
70		288
		289	#if EV_MULTIPLICITY
		290	ev_tstamp
		291	ev_now (EV_P)
		292	{
		293	return ev_rt_now;
		294	}
		295	#endif
		296
		297	#define array_roundsize(type,n) ((n) | 4 & ~3)
		298
71	#define array_needsize(base,cur,cnt,init) \	299	#define array_needsize(type,base,cur,cnt,init) \
72	if ((cnt) > cur) \	300	if (expect_false ((cnt) > cur)) \
73	{ \	301	{ \
74	int newcnt = cur ? cur << 1 : 16; \	302	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	303	do \
		304	{ \
		305	newcnt = array_roundsize (type, newcnt << 1); \
		306	} \
		307	while ((cnt) > newcnt); \
		308	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	309	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
77	init (base + cur, newcnt - cur); \	310	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	311	cur = newcnt; \
79	}	312	}
80		313
81	typedef struct	314	#define array_slim(type,stem) \
82	{	315	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	316	{ \
84	unsigned char wev, rev; /* want, received event set */	317	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	318	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		319	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		320	}
86		321
87	static ANFD *anfds;	322	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
88	static int anfdmax;	323	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		324	#define array_free_microshit(stem) \
		325	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
89		326
90	static int *fdchanges;	327	#define array_free(stem, idx) \
91	static int fdchangemax, fdchangecnt;	328	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		329
		330	/*****************************************************************************/
92		331
93	static void	332	static void
94	anfds_init (ANFD *base, int count)	333	anfds_init (ANFD *base, int count)
95	{	334	{
96	while (count--)	335	while (count--)
97	{	336	{
98	base->head = 0;	337	base->head = 0;
99	base->wev = base->rev = EV_NONE;	338	base->events = EV_NONE;
		339	base->reify = 0;
		340
100	++base;	341	++base;
101	}	342	}
102	}	343	}
103		344
104	typedef struct	345	void
		346	ev_feed_event (EV_P_ void *w, int revents)
105	{	347	{
106	struct ev_watcher *w;	348	W w_ = (W)w;
107	int events;
108	} ANPENDING;
109		349
110	static ANPENDING *pendings;	350	if (w_->pending)
111	static int pendingmax, pendingcnt;	351	{
		352	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		353	return;
		354	}
112		355
113	static void
114	event (struct ev_watcher *w, int events)
115	{
116	w->pending = ++pendingcnt;	356	w_->pending = ++pendingcnt [ABSPRI (w_)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	357	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
118	pendings [pendingcnt - 1].w = w;	358	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
119	pendings [pendingcnt - 1].events = events;	359	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
120	}	360	}
121		361
122	static void	362	static void
		363	queue_events (EV_P_ W *events, int eventcnt, int type)
		364	{
		365	int i;
		366
		367	for (i = 0; i < eventcnt; ++i)
		368	ev_feed_event (EV_A_ events [i], type);
		369	}
		370
		371	inline void
123	fd_event (int fd, int events)	372	fd_event (EV_P_ int fd, int revents)
124	{	373	{
125	ANFD *anfd = anfds + fd;	374	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	375	struct ev_io *w;
127		376
128	for (w = anfd->head; w; w = w->next)	377	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	378	{
130	int ev = w->events & events;	379	int ev = w->events & revents;
131		380
132	if (ev)	381	if (ev)
133	event ((struct ev_watcher *)w, ev);	382	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	{	383	}
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	}	384	}
159		385
160	static void	386	void
161	downheap (struct ev_timer **timers, int N, int k)	387	ev_feed_fd_event (EV_P_ int fd, int revents)
162	{	388	{
163	struct ev_timer *w = timers [k];	389	fd_event (EV_A_ fd, revents);
164
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	}	390	}
183		391
184	static struct ev_signal **signals;	392	/*****************************************************************************/
185	static int signalmax;
186		393
187	static void	394	static void
188	signals_init (struct ev_signal **base, int count)	395	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	{	396	{
247	int i;	397	int i;
248		398
249	for (i = 0; i < fdchangecnt; ++i)	399	for (i = 0; i < fdchangecnt; ++i)
250	{	400	{
251	int fd = fdchanges [i];	401	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	402	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	403	struct ev_io *w;
254		404
255	int wev = 0;	405	int events = 0;
256		406
257	for (w = anfd->head; w; w = w->next)	407	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	408	events |= w->events;
259		409
260	if (anfd->wev != wev)	410	anfd->reify = 0;
		411
		412	method_modify (EV_A_ fd, anfd->events, events);
		413	anfd->events = events;
		414	}
		415
		416	fdchangecnt = 0;
		417	}
		418
		419	static void
		420	fd_change (EV_P_ int fd)
		421	{
		422	if (anfds [fd].reify)
		423	return;
		424
		425	anfds [fd].reify = 1;
		426
		427	++fdchangecnt;
		428	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		429	fdchanges [fdchangecnt - 1] = fd;
		430	}
		431
		432	static void
		433	fd_kill (EV_P_ int fd)
		434	{
		435	struct ev_io *w;
		436
		437	while ((w = (struct ev_io *)anfds [fd].head))
		438	{
		439	ev_io_stop (EV_A_ w);
		440	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		441	}
		442	}
		443
		444	static int
		445	fd_valid (int fd)
		446	{
		447	#ifdef WIN32
		448	return !!win32_get_osfhandle (fd);
		449	#else
		450	return fcntl (fd, F_GETFD) != -1;
		451	#endif
		452	}
		453
		454	/* called on EBADF to verify fds */
		455	static void
		456	fd_ebadf (EV_P)
		457	{
		458	int fd;
		459
		460	for (fd = 0; fd < anfdmax; ++fd)
		461	if (anfds [fd].events)
		462	if (!fd_valid (fd) == -1 && errno == EBADF)
		463	fd_kill (EV_A_ fd);
		464	}
		465
		466	/* called on ENOMEM in select/poll to kill some fds and retry */
		467	static void
		468	fd_enomem (EV_P)
		469	{
		470	int fd;
		471
		472	for (fd = anfdmax; fd--; )
		473	if (anfds [fd].events)
		474	{
		475	fd_kill (EV_A_ fd);
		476	return;
		477	}
		478	}
		479
		480	/* usually called after fork if method needs to re-arm all fds from scratch */
		481	static void
		482	fd_rearm_all (EV_P)
		483	{
		484	int fd;
		485
		486	/* this should be highly optimised to not do anything but set a flag */
		487	for (fd = 0; fd < anfdmax; ++fd)
		488	if (anfds [fd].events)
		489	{
		490	anfds [fd].events = 0;
		491	fd_change (EV_A_ fd);
		492	}
		493	}
		494
		495	/*****************************************************************************/
		496
		497	static void
		498	upheap (WT *heap, int k)
		499	{
		500	WT w = heap [k];
		501
		502	while (k && heap [k >> 1]->at > w->at)
		503	{
		504	heap [k] = heap [k >> 1];
		505	((W)heap [k])->active = k + 1;
		506	k >>= 1;
		507	}
		508
		509	heap [k] = w;
		510	((W)heap [k])->active = k + 1;
		511
		512	}
		513
		514	static void
		515	downheap (WT *heap, int N, int k)
		516	{
		517	WT w = heap [k];
		518
		519	while (k < (N >> 1))
		520	{
		521	int j = k << 1;
		522
		523	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		524	++j;
		525
		526	if (w->at <= heap [j]->at)
		527	break;
		528
		529	heap [k] = heap [j];
		530	((W)heap [k])->active = k + 1;
		531	k = j;
		532	}
		533
		534	heap [k] = w;
		535	((W)heap [k])->active = k + 1;
		536	}
		537
		538	inline void
		539	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		540	{
		541	ev_tstamp old_at = heap [k]->at;
		542	heap [k]->at = at;
		543
		544	if (old_at < at)
		545	downheap (heap, N, k);
		546	else
		547	upheap (heap, k);
		548	}
		549
		550	/*****************************************************************************/
		551
		552	typedef struct
		553	{
		554	WL head;
		555	sig_atomic_t volatile gotsig;
		556	} ANSIG;
		557
		558	static ANSIG *signals;
		559	static int signalmax;
		560
		561	static int sigpipe [2];
		562	static sig_atomic_t volatile gotsig;
		563	static struct ev_io sigev;
		564
		565	static void
		566	signals_init (ANSIG *base, int count)
		567	{
		568	while (count--)
		569	{
		570	base->head = 0;
		571	base->gotsig = 0;
		572
		573	++base;
		574	}
		575	}
		576
		577	static void
		578	sighandler (int signum)
		579	{
		580	#if WIN32
		581	signal (signum, sighandler);
		582	#endif
		583
		584	signals [signum - 1].gotsig = 1;
		585
		586	if (!gotsig)
		587	{
		588	int old_errno = errno;
		589	gotsig = 1;
		590	#ifdef WIN32
		591	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		592	#else
		593	write (sigpipe [1], &signum, 1);
		594	#endif
		595	errno = old_errno;
		596	}
		597	}
		598
		599	void
		600	ev_feed_signal_event (EV_P_ int signum)
		601	{
		602	WL w;
		603
		604	#if EV_MULTIPLICITY
		605	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		606	#endif
		607
		608	--signum;
		609
		610	if (signum < 0 || signum >= signalmax)
		611	return;
		612
		613	signals [signum].gotsig = 0;
		614
		615	for (w = signals [signum].head; w; w = w->next)
		616	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		617	}
		618
		619	static void
		620	sigcb (EV_P_ struct ev_io *iow, int revents)
		621	{
		622	int signum;
		623
		624	#ifdef WIN32
		625	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		626	#else
		627	read (sigpipe [0], &revents, 1);
		628	#endif
		629	gotsig = 0;
		630
		631	for (signum = signalmax; signum--; )
		632	if (signals [signum].gotsig)
		633	ev_feed_signal_event (EV_A_ signum + 1);
		634	}
		635
		636	static void
		637	siginit (EV_P)
		638	{
		639	#ifndef WIN32
		640	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		641	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		642
		643	/* rather than sort out wether we really need nb, set it */
		644	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		645	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		646	#endif
		647
		648	ev_io_set (&sigev, sigpipe [0], EV_READ);
		649	ev_io_start (EV_A_ &sigev);
		650	ev_unref (EV_A); /* child watcher should not keep loop alive */
		651	}
		652
		653	/*****************************************************************************/
		654
		655	static struct ev_child *childs [PID_HASHSIZE];
		656
		657	#ifndef WIN32
		658
		659	static struct ev_signal childev;
		660
		661	#ifndef WCONTINUED
		662	# define WCONTINUED 0
		663	#endif
		664
		665	static void
		666	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		667	{
		668	struct ev_child *w;
		669
		670	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		671	if (w->pid == pid || !w->pid)
		672	{
		673	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		674	w->rpid = pid;
		675	w->rstatus = status;
		676	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		677	}
		678	}
		679
		680	static void
		681	childcb (EV_P_ struct ev_signal *sw, int revents)
		682	{
		683	int pid, status;
		684
		685	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		686	{
		687	/* make sure we are called again until all childs have been reaped */
		688	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		689
		690	child_reap (EV_A_ sw, pid, pid, status);
		691	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		692	}
		693	}
		694
		695	#endif
		696
		697	/*****************************************************************************/
		698
		699	#if EV_USE_KQUEUE
		700	# include "ev_kqueue.c"
		701	#endif
		702	#if EV_USE_EPOLL
		703	# include "ev_epoll.c"
		704	#endif
		705	#if EV_USE_POLL
		706	# include "ev_poll.c"
		707	#endif
		708	#if EV_USE_SELECT
		709	# include "ev_select.c"
		710	#endif
		711
		712	int
		713	ev_version_major (void)
		714	{
		715	return EV_VERSION_MAJOR;
		716	}
		717
		718	int
		719	ev_version_minor (void)
		720	{
		721	return EV_VERSION_MINOR;
		722	}
		723
		724	/* return true if we are running with elevated privileges and should ignore env variables */
		725	static int
		726	enable_secure (void)
		727	{
		728	#ifdef WIN32
		729	return 0;
		730	#else
		731	return getuid () != geteuid ()
		732	|| getgid () != getegid ();
		733	#endif
		734	}
		735
		736	int
		737	ev_method (EV_P)
		738	{
		739	return method;
		740	}
		741
		742	static void
		743	loop_init (EV_P_ int methods)
		744	{
		745	if (!method)
		746	{
		747	#if EV_USE_MONOTONIC
		748	{
		749	struct timespec ts;
		750	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		751	have_monotonic = 1;
		752	}
		753	#endif
		754
		755	ev_rt_now = ev_time ();
		756	mn_now = get_clock ();
		757	now_floor = mn_now;
		758	rtmn_diff = ev_rt_now - mn_now;
		759
		760	if (methods == EVMETHOD_AUTO)
		761	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		762	methods = atoi (getenv ("LIBEV_METHODS"));
		763	else
		764	methods = EVMETHOD_ANY;
		765
		766	method = 0;
		767	#if EV_USE_WIN32
		768	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		769	#endif
		770	#if EV_USE_KQUEUE
		771	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		772	#endif
		773	#if EV_USE_EPOLL
		774	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		775	#endif
		776	#if EV_USE_POLL
		777	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		778	#endif
		779	#if EV_USE_SELECT
		780	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		781	#endif
		782
		783	ev_init (&sigev, sigcb);
		784	ev_set_priority (&sigev, EV_MAXPRI);
		785	}
		786	}
		787
		788	void
		789	loop_destroy (EV_P)
		790	{
		791	int i;
		792
		793	#if EV_USE_WIN32
		794	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		795	#endif
		796	#if EV_USE_KQUEUE
		797	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		798	#endif
		799	#if EV_USE_EPOLL
		800	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		801	#endif
		802	#if EV_USE_POLL
		803	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		804	#endif
		805	#if EV_USE_SELECT
		806	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		807	#endif
		808
		809	for (i = NUMPRI; i--; )
		810	array_free (pending, [i]);
		811
		812	/* have to use the microsoft-never-gets-it-right macro */
		813	array_free_microshit (fdchange);
		814	array_free_microshit (timer);
		815	#if EV_PERIODICS
		816	array_free_microshit (periodic);
		817	#endif
		818	array_free_microshit (idle);
		819	array_free_microshit (prepare);
		820	array_free_microshit (check);
		821
		822	method = 0;
		823	}
		824
		825	static void
		826	loop_fork (EV_P)
		827	{
		828	#if EV_USE_EPOLL
		829	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		830	#endif
		831	#if EV_USE_KQUEUE
		832	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		833	#endif
		834
		835	if (ev_is_active (&sigev))
		836	{
		837	/* default loop */
		838
		839	ev_ref (EV_A);
		840	ev_io_stop (EV_A_ &sigev);
		841	close (sigpipe [0]);
		842	close (sigpipe [1]);
		843
		844	while (pipe (sigpipe))
		845	syserr ("(libev) error creating pipe");
		846
		847	siginit (EV_A);
		848	}
		849
		850	postfork = 0;
		851	}
		852
		853	#if EV_MULTIPLICITY
		854	struct ev_loop *
		855	ev_loop_new (int methods)
		856	{
		857	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		858
		859	memset (loop, 0, sizeof (struct ev_loop));
		860
		861	loop_init (EV_A_ methods);
		862
		863	if (ev_method (EV_A))
		864	return loop;
		865
		866	return 0;
		867	}
		868
		869	void
		870	ev_loop_destroy (EV_P)
		871	{
		872	loop_destroy (EV_A);
		873	ev_free (loop);
		874	}
		875
		876	void
		877	ev_loop_fork (EV_P)
		878	{
		879	postfork = 1;
		880	}
		881
		882	#endif
		883
		884	#if EV_MULTIPLICITY
		885	struct ev_loop *
		886	#else
		887	int
		888	#endif
		889	ev_default_loop (int methods)
		890	{
		891	if (sigpipe [0] == sigpipe [1])
		892	if (pipe (sigpipe))
		893	return 0;
		894
		895	if (!default_loop)
		896	{
		897	#if EV_MULTIPLICITY
		898	struct ev_loop *loop = default_loop = &default_loop_struct;
		899	#else
		900	default_loop = 1;
		901	#endif
		902
		903	loop_init (EV_A_ methods);
		904
		905	if (ev_method (EV_A))
261	{	906	{
262	method_modify (fd, anfd->wev, wev);	907	siginit (EV_A);
263	anfd->wev = wev;	908
		909	#ifndef WIN32
		910	ev_signal_init (&childev, childcb, SIGCHLD);
		911	ev_set_priority (&childev, EV_MAXPRI);
		912	ev_signal_start (EV_A_ &childev);
		913	ev_unref (EV_A); /* child watcher should not keep loop alive */
		914	#endif
264	}	915	}
		916	else
		917	default_loop = 0;
265	}	918	}
266		919
267	fdchangecnt = 0;	920	return default_loop;
268	}	921	}
269		922
		923	void
		924	ev_default_destroy (void)
		925	{
		926	#if EV_MULTIPLICITY
		927	struct ev_loop *loop = default_loop;
		928	#endif
		929
		930	#ifndef WIN32
		931	ev_ref (EV_A); /* child watcher */
		932	ev_signal_stop (EV_A_ &childev);
		933	#endif
		934
		935	ev_ref (EV_A); /* signal watcher */
		936	ev_io_stop (EV_A_ &sigev);
		937
		938	close (sigpipe [0]); sigpipe [0] = 0;
		939	close (sigpipe [1]); sigpipe [1] = 0;
		940
		941	loop_destroy (EV_A);
		942	}
		943
		944	void
		945	ev_default_fork (void)
		946	{
		947	#if EV_MULTIPLICITY
		948	struct ev_loop *loop = default_loop;
		949	#endif
		950
		951	if (method)
		952	postfork = 1;
		953	}
		954
		955	/*****************************************************************************/
		956
270	static void	957	static int
271	call_pending ()	958	any_pending (EV_P)
272	{	959	{
273	int i;	960	int pri;
274		961
275	for (i = 0; i < pendingcnt; ++i)	962	for (pri = NUMPRI; pri--; )
		963	if (pendingcnt [pri])
		964	return 1;
		965
		966	return 0;
		967	}
		968
		969	static void
		970	call_pending (EV_P)
		971	{
		972	int pri;
		973
		974	for (pri = NUMPRI; pri--; )
		975	while (pendingcnt [pri])
276	{	976	{
277	ANPENDING *p = pendings + i;	977	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
278		978
279	if (p->w)	979	if (p->w)
280	{	980	{
281	p->w->pending = 0;	981	p->w->pending = 0;
282	p->w->cb (p->w, p->events);	982	EV_CB_INVOKE (p->w, p->events);
283	}	983	}
284	}	984	}
285
286	pendingcnt = 0;
287	}	985	}
288		986
289	static void	987	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	988	timers_reify (EV_P)
291	{	989	{
292	while (timercnt && timers [0]->at <= now)	990	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	991	{
294	struct ev_timer *w = timers [0];	992	struct ev_timer *w = timers [0];
		993
		994	assert (("inactive timer on timer heap detected", ev_is_active (w)));
295		995
296	/* first reschedule or stop timer */	996	/* first reschedule or stop timer */
297	if (w->repeat)	997	if (w->repeat)
298	{	998	{
299	if (w->is_abs)	999	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;	1000
301	else
302	w->at = now + w->repeat;	1001	((WT)w)->at += w->repeat;
		1002	if (((WT)w)->at < mn_now)
		1003	((WT)w)->at = mn_now;
303		1004
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	1005	downheap ((WT *)timers, timercnt, 0);
307	}	1006	}
308	else	1007	else
		1008	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1009
		1010	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1011	}
		1012	}
		1013
		1014	#if EV_PERIODICS
		1015	static void
		1016	periodics_reify (EV_P)
		1017	{
		1018	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1019	{
		1020	struct ev_periodic *w = periodics [0];
		1021
		1022	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1023
		1024	/* first reschedule or stop timer */
		1025	if (w->reschedule_cb)
309	{	1026	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	1027	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
311	--timercnt; /* maybe pass by reference instead? */	1028
		1029	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1030	downheap ((WT *)periodics, periodiccnt, 0);
312	}	1031	}
		1032	else if (w->interval)
		1033	{
		1034	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1035	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1036	downheap ((WT *)periodics, periodiccnt, 0);
		1037	}
		1038	else
		1039	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		1040
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	1041	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
315	}	1042	}
316	}	1043	}
317		1044
318	static void	1045	static void
319	time_update ()	1046	periodics_reschedule (EV_P)
320	{	1047	{
321	int i;	1048	int i;
		1049
		1050	/* adjust periodics after time jump */
		1051	for (i = 0; i < periodiccnt; ++i)
		1052	{
		1053	struct ev_periodic *w = periodics [i];
		1054
		1055	if (w->reschedule_cb)
		1056	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1057	else if (w->interval)
		1058	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1059	}
		1060
		1061	/* now rebuild the heap */
		1062	for (i = periodiccnt >> 1; i--; )
		1063	downheap ((WT *)periodics, periodiccnt, i);
		1064	}
		1065	#endif
		1066
		1067	inline int
		1068	time_update_monotonic (EV_P)
		1069	{
		1070	mn_now = get_clock ();
		1071
		1072	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1073	{
		1074	ev_rt_now = rtmn_diff + mn_now;
		1075	return 0;
		1076	}
		1077	else
		1078	{
		1079	now_floor = mn_now;
322	ev_now = ev_time ();	1080	ev_rt_now = ev_time ();
323		1081	return 1;
324	if (have_monotonic)
325	{	1082	}
326	ev_tstamp odiff = diff;	1083	}
327		1084
328	/* detecting time jumps is much more difficult */	1085	static void
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1086	time_update (EV_P)
		1087	{
		1088	int i;
		1089
		1090	#if EV_USE_MONOTONIC
		1091	if (expect_true (have_monotonic))
		1092	{
		1093	if (time_update_monotonic (EV_A))
330	{	1094	{
331	now = get_clock ();	1095	ev_tstamp odiff = rtmn_diff;
		1096
		1097	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1098	{
332	diff = ev_now - now;	1099	rtmn_diff = ev_rt_now - mn_now;
333		1100
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1101	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
335	return; /* all is well */	1102	return; /* all is well */
336		1103
337	ev_now = ev_time ();	1104	ev_rt_now = ev_time ();
		1105	mn_now = get_clock ();
		1106	now_floor = mn_now;
		1107	}
		1108
		1109	# if EV_PERIODICS
		1110	periodics_reschedule (EV_A);
		1111	# endif
		1112	/* no timer adjustment, as the monotonic clock doesn't jump */
		1113	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
338	}	1114	}
		1115	}
		1116	else
		1117	#endif
		1118	{
		1119	ev_rt_now = ev_time ();
339		1120
340	/* time jump detected, reschedule atimers */	1121	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
341	for (i = 0; i < atimercnt; ++i)
342	{	1122	{
343	struct ev_timer *w = atimers [i];	1123	#if EV_PERIODICS
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1124	periodics_reschedule (EV_A);
		1125	#endif
		1126
		1127	/* adjust timers. this is easy, as the offset is the same for all */
		1128	for (i = 0; i < timercnt; ++i)
		1129	((WT)timers [i])->at += ev_rt_now - mn_now;
345	}	1130	}
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		1131
354	now = ev_now;	1132	mn_now = ev_rt_now;
355	}	1133	}
356	}	1134	}
357		1135
358	int ev_loop_done;	1136	void
		1137	ev_ref (EV_P)
		1138	{
		1139	++activecnt;
		1140	}
359		1141
		1142	void
		1143	ev_unref (EV_P)
		1144	{
		1145	--activecnt;
		1146	}
		1147
		1148	static int loop_done;
		1149
		1150	void
360	void ev_loop (int flags)	1151	ev_loop (EV_P_ int flags)
361	{	1152	{
362	double block;	1153	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	1154	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		1155
365	do	1156	do
366	{	1157	{
		1158	/* queue check watchers (and execute them) */
		1159	if (expect_false (preparecnt))
		1160	{
		1161	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1162	call_pending (EV_A);
		1163	}
		1164
		1165	/* we might have forked, so reify kernel state if necessary */
		1166	if (expect_false (postfork))
		1167	loop_fork (EV_A);
		1168
367	/* update fd-related kernel structures */	1169	/* update fd-related kernel structures */
368	fd_reify ();	1170	fd_reify (EV_A);
369		1171
370	/* calculate blocking time */	1172	/* calculate blocking time */
		1173
		1174	/* we only need this for !monotonic clock or timers, but as we basically
		1175	always have timers, we just calculate it always */
		1176	#if EV_USE_MONOTONIC
		1177	if (expect_true (have_monotonic))
		1178	time_update_monotonic (EV_A);
		1179	else
		1180	#endif
		1181	{
		1182	ev_rt_now = ev_time ();
		1183	mn_now = ev_rt_now;
		1184	}
		1185
371	if (flags & EVLOOP_NONBLOCK)	1186	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	1187	block = 0.;
373	else	1188	else
374	{	1189	{
375	block = MAX_BLOCKTIME;	1190	block = MAX_BLOCKTIME;
376		1191
377	if (rtimercnt)	1192	if (timercnt)
378	{	1193	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1194	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
380	if (block > to) block = to;	1195	if (block > to) block = to;
381	}	1196	}
382		1197
		1198	#if EV_PERIODICS
383	if (atimercnt)	1199	if (periodiccnt)
384	{	1200	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1201	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
386	if (block > to) block = to;	1202	if (block > to) block = to;
387	}	1203	}
		1204	#endif
388		1205
389	if (block < 0.) block = 0.;	1206	if (block < 0.) block = 0.;
390	}	1207	}
391		1208
392	method_poll (block);	1209	method_poll (EV_A_ block);
393		1210
394	/* update ev_now, do magic */	1211	/* update ev_rt_now, do magic */
395	time_update ();	1212	time_update (EV_A);
396		1213
397	/* put pending timers into pendign queue and reschedule them */	1214	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1215	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1216	#if EV_PERIODICS
400	/* relative timers second */	1217	periodics_reify (EV_A); /* absolute timers called first */
401	timers_reify (rtimers, rtimercnt, now);	1218	#endif
402		1219
		1220	/* queue idle watchers unless io or timers are pending */
		1221	if (idlecnt && !any_pending (EV_A))
		1222	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1223
		1224	/* queue check watchers, to be executed first */
		1225	if (checkcnt)
		1226	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1227
403	call_pending ();	1228	call_pending (EV_A);
404	}	1229	}
405	while (!ev_loop_done);	1230	while (activecnt && !loop_done);
406	}
407		1231
408	static void	1232	if (loop_done != 2)
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1233	loop_done = 0;
		1234	}
		1235
		1236	void
		1237	ev_unloop (EV_P_ int how)
		1238	{
		1239	loop_done = how;
		1240	}
		1241
		1242	/*****************************************************************************/
		1243
		1244	inline void
		1245	wlist_add (WL *head, WL elem)
410	{	1246	{
411	elem->next = *head;	1247	elem->next = *head;
412	*head = elem;	1248	*head = elem;
413	}	1249	}
414		1250
415	static void	1251	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1252	wlist_del (WL *head, WL elem)
417	{	1253	{
418	while (*head)	1254	while (*head)
419	{	1255	{
420	if (*head == elem)	1256	if (*head == elem)
421	{	1257	{
…		…
425		1261
426	head = &(*head)->next;	1262	head = &(*head)->next;
427	}	1263	}
428	}	1264	}
429		1265
430	static void	1266	inline void
431	ev_start (struct ev_watcher *w, int active)	1267	ev_clear_pending (EV_P_ W w)
432	{	1268	{
		1269	if (w->pending)
		1270	{
		1271	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1272	w->pending = 0;
		1273	}
		1274	}
		1275
		1276	inline void
		1277	ev_start (EV_P_ W w, int active)
		1278	{
		1279	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1280	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1281
434	w->active = active;	1282	w->active = active;
		1283	ev_ref (EV_A);
435	}	1284	}
436		1285
437	static void	1286	inline void
438	ev_stop (struct ev_watcher *w)	1287	ev_stop (EV_P_ W w)
439	{	1288	{
440	if (w->pending)	1289	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1290	w->active = 0;
444	/* nop */
445	}	1291	}
446		1292
		1293	/*****************************************************************************/
		1294
447	void	1295	void
448	evio_start (struct ev_io *w)	1296	ev_io_start (EV_P_ struct ev_io *w)
449	{	1297	{
		1298	int fd = w->fd;
		1299
450	if (ev_is_active (w))	1300	if (ev_is_active (w))
451	return;	1301	return;
452		1302
453	int fd = w->fd;	1303	assert (("ev_io_start called with negative fd", fd >= 0));
454		1304
455	ev_start ((struct ev_watcher *)w, 1);	1305	ev_start (EV_A_ (W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1306	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1307	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		1308
459	++fdchangecnt;	1309	fd_change (EV_A_ fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1310	}
463		1311
464	void	1312	void
465	evio_stop (struct ev_io *w)	1313	ev_io_stop (EV_P_ struct ev_io *w)
466	{	1314	{
		1315	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1316	if (!ev_is_active (w))
468	return;	1317	return;
469		1318
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1319	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
471	ev_stop ((struct ev_watcher *)w);
472		1320
473	++fdchangecnt;	1321	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );	1322	ev_stop (EV_A_ (W)w);
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}
477		1323
		1324	fd_change (EV_A_ w->fd);
		1325	}
		1326
478	void	1327	void
479	evtimer_start (struct ev_timer *w)	1328	ev_timer_start (EV_P_ struct ev_timer *w)
480	{	1329	{
481	if (ev_is_active (w))	1330	if (ev_is_active (w))
482	return;	1331	return;
483		1332
484	if (w->is_abs)	1333	((WT)w)->at += mn_now;
		1334
		1335	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1336
		1337	ev_start (EV_A_ (W)w, ++timercnt);
		1338	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1339	timers [timercnt - 1] = w;
		1340	upheap ((WT *)timers, timercnt - 1);
		1341
		1342	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1343	}
		1344
		1345	void
		1346	ev_timer_stop (EV_P_ struct ev_timer *w)
		1347	{
		1348	ev_clear_pending (EV_A_ (W)w);
		1349	if (!ev_is_active (w))
		1350	return;
		1351
		1352	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1353
		1354	if (((W)w)->active < timercnt--)
		1355	{
		1356	timers [((W)w)->active - 1] = timers [timercnt];
		1357	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
485	{	1358	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1359
		1360	((WT)w)->at -= mn_now;
		1361
		1362	ev_stop (EV_A_ (W)w);
		1363	}
		1364
		1365	void
		1366	ev_timer_again (EV_P_ struct ev_timer *w)
		1367	{
		1368	if (ev_is_active (w))
		1369	{
487	if (w->repeat)	1370	if (w->repeat)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1371	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
		1372	else
		1373	ev_timer_stop (EV_A_ w);
		1374	}
		1375	else if (w->repeat)
		1376	ev_timer_start (EV_A_ w);
		1377	}
489		1378
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	1379	#if EV_PERIODICS
491	array_needsize (atimers, atimermax, atimercnt, );	1380	void
492	atimers [atimercnt - 1] = w;	1381	ev_periodic_start (EV_P_ struct ev_periodic *w)
493	upheap (atimers, atimercnt - 1);	1382	{
		1383	if (ev_is_active (w))
		1384	return;
		1385
		1386	if (w->reschedule_cb)
		1387	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1388	else if (w->interval)
494	}	1389	{
		1390	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1391	/* this formula differs from the one in periodic_reify because we do not always round up */
		1392	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1393	}
		1394
		1395	ev_start (EV_A_ (W)w, ++periodiccnt);
		1396	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1397	periodics [periodiccnt - 1] = w;
		1398	upheap ((WT *)periodics, periodiccnt - 1);
		1399
		1400	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1401	}
		1402
		1403	void
		1404	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1405	{
		1406	ev_clear_pending (EV_A_ (W)w);
		1407	if (!ev_is_active (w))
		1408	return;
		1409
		1410	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1411
		1412	if (((W)w)->active < periodiccnt--)
		1413	{
		1414	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1415	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1416	}
		1417
		1418	ev_stop (EV_A_ (W)w);
		1419	}
		1420
		1421	void
		1422	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1423	{
		1424	/* TODO: use adjustheap and recalculation */
		1425	ev_periodic_stop (EV_A_ w);
		1426	ev_periodic_start (EV_A_ w);
		1427	}
		1428	#endif
		1429
		1430	void
		1431	ev_idle_start (EV_P_ struct ev_idle *w)
		1432	{
		1433	if (ev_is_active (w))
		1434	return;
		1435
		1436	ev_start (EV_A_ (W)w, ++idlecnt);
		1437	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1438	idles [idlecnt - 1] = w;
		1439	}
		1440
		1441	void
		1442	ev_idle_stop (EV_P_ struct ev_idle *w)
		1443	{
		1444	ev_clear_pending (EV_A_ (W)w);
		1445	if (ev_is_active (w))
		1446	return;
		1447
		1448	idles [((W)w)->active - 1] = idles [--idlecnt];
		1449	ev_stop (EV_A_ (W)w);
		1450	}
		1451
		1452	void
		1453	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1454	{
		1455	if (ev_is_active (w))
		1456	return;
		1457
		1458	ev_start (EV_A_ (W)w, ++preparecnt);
		1459	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1460	prepares [preparecnt - 1] = w;
		1461	}
		1462
		1463	void
		1464	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1465	{
		1466	ev_clear_pending (EV_A_ (W)w);
		1467	if (ev_is_active (w))
		1468	return;
		1469
		1470	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1471	ev_stop (EV_A_ (W)w);
		1472	}
		1473
		1474	void
		1475	ev_check_start (EV_P_ struct ev_check *w)
		1476	{
		1477	if (ev_is_active (w))
		1478	return;
		1479
		1480	ev_start (EV_A_ (W)w, ++checkcnt);
		1481	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1482	checks [checkcnt - 1] = w;
		1483	}
		1484
		1485	void
		1486	ev_check_stop (EV_P_ struct ev_check *w)
		1487	{
		1488	ev_clear_pending (EV_A_ (W)w);
		1489	if (!ev_is_active (w))
		1490	return;
		1491
		1492	checks [((W)w)->active - 1] = checks [--checkcnt];
		1493	ev_stop (EV_A_ (W)w);
		1494	}
		1495
		1496	#ifndef SA_RESTART
		1497	# define SA_RESTART 0
		1498	#endif
		1499
		1500	void
		1501	ev_signal_start (EV_P_ struct ev_signal *w)
		1502	{
		1503	#if EV_MULTIPLICITY
		1504	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1505	#endif
		1506	if (ev_is_active (w))
		1507	return;
		1508
		1509	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1510
		1511	ev_start (EV_A_ (W)w, 1);
		1512	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1513	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1514
		1515	if (!((WL)w)->next)
		1516	{
		1517	#if WIN32
		1518	signal (w->signum, sighandler);
		1519	#else
		1520	struct sigaction sa;
		1521	sa.sa_handler = sighandler;
		1522	sigfillset (&sa.sa_mask);
		1523	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1524	sigaction (w->signum, &sa, 0);
		1525	#endif
		1526	}
		1527	}
		1528
		1529	void
		1530	ev_signal_stop (EV_P_ struct ev_signal *w)
		1531	{
		1532	ev_clear_pending (EV_A_ (W)w);
		1533	if (!ev_is_active (w))
		1534	return;
		1535
		1536	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1537	ev_stop (EV_A_ (W)w);
		1538
		1539	if (!signals [w->signum - 1].head)
		1540	signal (w->signum, SIG_DFL);
		1541	}
		1542
		1543	void
		1544	ev_child_start (EV_P_ struct ev_child *w)
		1545	{
		1546	#if EV_MULTIPLICITY
		1547	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1548	#endif
		1549	if (ev_is_active (w))
		1550	return;
		1551
		1552	ev_start (EV_A_ (W)w, 1);
		1553	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1554	}
		1555
		1556	void
		1557	ev_child_stop (EV_P_ struct ev_child *w)
		1558	{
		1559	ev_clear_pending (EV_A_ (W)w);
		1560	if (!ev_is_active (w))
		1561	return;
		1562
		1563	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1564	ev_stop (EV_A_ (W)w);
		1565	}
		1566
		1567	/*****************************************************************************/
		1568
		1569	struct ev_once
		1570	{
		1571	struct ev_io io;
		1572	struct ev_timer to;
		1573	void (*cb)(int revents, void *arg);
		1574	void *arg;
		1575	};
		1576
		1577	static void
		1578	once_cb (EV_P_ struct ev_once *once, int revents)
		1579	{
		1580	void (*cb)(int revents, void *arg) = once->cb;
		1581	void *arg = once->arg;
		1582
		1583	ev_io_stop (EV_A_ &once->io);
		1584	ev_timer_stop (EV_A_ &once->to);
		1585	ev_free (once);
		1586
		1587	cb (revents, arg);
		1588	}
		1589
		1590	static void
		1591	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1592	{
		1593	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1594	}
		1595
		1596	static void
		1597	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1598	{
		1599	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1600	}
		1601
		1602	void
		1603	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1604	{
		1605	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
		1606
		1607	if (!once)
		1608	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
495	else	1609	else
496	{	1610	{
497	w->at += now;	1611	once->cb = cb;
		1612	once->arg = arg;
498		1613
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1614	ev_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1615	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	{	1616	{
517	atimers [w->active - 1] = atimers [atimercnt];	1617	ev_io_set (&once->io, fd, events);
518	downheap (atimers, atimercnt, w->active - 1);	1618	ev_io_start (EV_A_ &once->io);
519	}	1619	}
520	}	1620
521	else	1621	ev_init (&once->to, once_cb_to);
522	{	1622	if (timeout >= 0.)
523	if (w->active < rtimercnt--)
524	{	1623	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1624	ev_timer_set (&once->to, timeout, 0.);
526	downheap (rtimers, rtimercnt, w->active - 1);	1625	ev_timer_start (EV_A_ &once->to);
527	}	1626	}
528	}	1627	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1628	}
532		1629
533	void	1630	#ifdef __cplusplus
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	}	1631	}
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	1632	#endif
595		1633
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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