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Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.82 by root, Fri Nov 9 20:55:09 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#ifndef EV_STANDALONE
		32	# include "config.h"
		33
		34	# if HAVE_CLOCK_GETTIME
		35	# define EV_USE_MONOTONIC 1
		36	# define EV_USE_REALTIME 1
		37	# endif
		38
		39	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		40	# define EV_USE_SELECT 1
		41	# endif
		42
		43	# if HAVE_POLL && HAVE_POLL_H
		44	# define EV_USE_POLL 1
		45	# endif
		46
		47	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		48	# define EV_USE_EPOLL 1
		49	# endif
		50
		51	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		52	# define EV_USE_KQUEUE 1
		53	# endif
		54
		55	#endif
		56
1	#include <math.h>	57	#include <math.h>
2	#include <stdlib.h>	58	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	59	#include <fcntl.h>
5	#include <signal.h>	60	#include <stddef.h>
6		61
7	#include <stdio.h>	62	#include <stdio.h>
8		63
9	#include <assert.h>	64	#include <assert.h>
10	#include <errno.h>	65	#include <errno.h>
11	#include <sys/time.h>	66	#include <sys/types.h>
12	#include <time.h>	67	#include <time.h>
13		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
14	#ifdef CLOCK_MONOTONIC	114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	116	# define EV_USE_MONOTONIC 0
16	#endif	117	#endif
17		118
		119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	121	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	122	#endif
20	#define HAVE_SELECT 1	123
		124	/**/
21		125
22	#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) */
23	#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 */
24		130
		131	#ifdef EV_H
		132	# include EV_H
		133	#else
25	#include "ev.h"	134	# include "ev.h"
		135	#endif
26		136
		137	#if __GNUC__ >= 3
		138	# define expect(expr,value) __builtin_expect ((expr),(value))
		139	# define inline inline
		140	#else
		141	# define expect(expr,value) (expr)
		142	# define inline static
		143	#endif
		144
		145	#define expect_false(expr) expect ((expr) != 0, 0)
		146	#define expect_true(expr) expect ((expr) != 0, 1)
		147
		148	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		149	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		150
27	struct ev_watcher {	151	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);
29	};
30
31	struct ev_watcher_list {	152	typedef struct ev_watcher_list *WL;
32	EV_WATCHER_LIST (ev_watcher_list);	153	typedef struct ev_watcher_time *WT;
33	};
34		154
35	static ev_tstamp now, diff; /* monotonic clock */	155	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
36	ev_tstamp ev_now;
37	int ev_method;
38		156
39	static int have_monotonic; /* runtime */	157	#include "ev_win32.c"
40		158
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	159	/*****************************************************************************/
42	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);
44		160
45	ev_tstamp	161	static void (*syserr_cb)(const char *msg);
		162
		163	void ev_set_syserr_cb (void (*cb)(const char *msg))
		164	{
		165	syserr_cb = cb;
		166	}
		167
		168	static void
		169	syserr (const char *msg)
		170	{
		171	if (!msg)
		172	msg = "(libev) system error";
		173
		174	if (syserr_cb)
		175	syserr_cb (msg);
		176	else
		177	{
		178	perror (msg);
		179	abort ();
		180	}
		181	}
		182
		183	static void *(*alloc)(void *ptr, long size);
		184
		185	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		186	{
		187	alloc = cb;
		188	}
		189
		190	static void *
		191	ev_realloc (void *ptr, long size)
		192	{
		193	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		194
		195	if (!ptr && size)
		196	{
		197	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		198	abort ();
		199	}
		200
		201	return ptr;
		202	}
		203
		204	#define ev_malloc(size) ev_realloc (0, (size))
		205	#define ev_free(ptr) ev_realloc ((ptr), 0)
		206
		207	/*****************************************************************************/
		208
		209	typedef struct
		210	{
		211	WL head;
		212	unsigned char events;
		213	unsigned char reify;
		214	} ANFD;
		215
		216	typedef struct
		217	{
		218	W w;
		219	int events;
		220	} ANPENDING;
		221
		222	#if EV_MULTIPLICITY
		223
		224	struct ev_loop
		225	{
		226	#define VAR(name,decl) decl;
		227	#include "ev_vars.h"
		228	#undef VAR
		229	};
		230	#include "ev_wrap.h"
		231
		232	struct ev_loop default_loop_struct;
		233	static struct ev_loop *default_loop;
		234
		235	#else
		236
		237	#define VAR(name,decl) static decl;
		238	#include "ev_vars.h"
		239	#undef VAR
		240
		241	static int default_loop;
		242
		243	#endif
		244
		245	/*****************************************************************************/
		246
		247	inline ev_tstamp
46	ev_time (void)	248	ev_time (void)
47	{	249	{
48	#if HAVE_REALTIME	250	#if EV_USE_REALTIME
49	struct timespec ts;	251	struct timespec ts;
50	clock_gettime (CLOCK_REALTIME, &ts);	252	clock_gettime (CLOCK_REALTIME, &ts);
51	return ts.tv_sec + ts.tv_nsec * 1e-9;	253	return ts.tv_sec + ts.tv_nsec * 1e-9;
52	#else	254	#else
53	struct timeval tv;	255	struct timeval tv;
54	gettimeofday (&tv, 0);	256	gettimeofday (&tv, 0);
55	return tv.tv_sec + tv.tv_usec * 1e-6;	257	return tv.tv_sec + tv.tv_usec * 1e-6;
56	#endif	258	#endif
57	}	259	}
58		260
59	static ev_tstamp	261	inline ev_tstamp
60	get_clock (void)	262	get_clock (void)
61	{	263	{
62	#if HAVE_MONOTONIC	264	#if EV_USE_MONOTONIC
63	if (have_monotonic)	265	if (expect_true (have_monotonic))
64	{	266	{
65	struct timespec ts;	267	struct timespec ts;
66	clock_gettime (CLOCK_MONOTONIC, &ts);	268	clock_gettime (CLOCK_MONOTONIC, &ts);
67	return ts.tv_sec + ts.tv_nsec * 1e-9;	269	return ts.tv_sec + ts.tv_nsec * 1e-9;
68	}	270	}
69	#endif	271	#endif
70		272
71	return ev_time ();	273	return ev_time ();
72	}	274	}
73		275
		276	ev_tstamp
		277	ev_now (EV_P)
		278	{
		279	return rt_now;
		280	}
		281
		282	#define array_roundsize(type,n) ((n) | 4 & ~3)
		283
74	#define array_needsize(base,cur,cnt,init) \	284	#define array_needsize(type,base,cur,cnt,init) \
75	if ((cnt) > cur) \	285	if (expect_false ((cnt) > cur)) \
76	{ \	286	{ \
77	int newcnt = cur ? cur << 1 : 16; \	287	int newcnt = cur; \
78	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	288	do \
		289	{ \
		290	newcnt = array_roundsize (type, newcnt << 1); \
		291	} \
		292	while ((cnt) > newcnt); \
		293	\
79	base = realloc (base, sizeof (*base) * (newcnt)); \	294	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
80	init (base + cur, newcnt - cur); \	295	init (base + cur, newcnt - cur); \
81	cur = newcnt; \	296	cur = newcnt; \
82	}	297	}
83		298
84	typedef struct	299	#define array_slim(type,stem) \
85	{	300	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
86	struct ev_io *head;	301	{ \
87	unsigned char wev, rev; /* want, received event set */	302	stem ## max = array_roundsize (stem ## cnt >> 1); \
88	} ANFD;	303	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		304	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		305	}
89		306
90	static ANFD *anfds;	307	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
91	static int anfdmax;	308	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		309	#define array_free_microshit(stem) \
		310	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
92		311
93	static int *fdchanges;	312	#define array_free(stem, idx) \
94	static int fdchangemax, fdchangecnt;	313	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		314
		315	/*****************************************************************************/
95		316
96	static void	317	static void
97	anfds_init (ANFD *base, int count)	318	anfds_init (ANFD *base, int count)
98	{	319	{
99	while (count--)	320	while (count--)
100	{	321	{
101	base->head = 0;	322	base->head = 0;
102	base->wev = base->rev = EV_NONE;	323	base->events = EV_NONE;
		324	base->reify = 0;
		325
103	++base;	326	++base;
104	}	327	}
105	}	328	}
106		329
107	typedef struct	330	void
		331	ev_feed_event (EV_P_ void *w, int revents)
108	{	332	{
109	struct ev_watcher *w;	333	W w_ = (W)w;
110	int events;
111	} ANPENDING;
112		334
113	static ANPENDING *pendings;	335	if (w_->pending)
114	static int pendingmax, pendingcnt;	336	{
		337	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		338	return;
		339	}
115		340
116	static void
117	event (struct ev_watcher *w, int events)
118	{
119	w->pending = ++pendingcnt;	341	w_->pending = ++pendingcnt [ABSPRI (w_)];
120	array_needsize (pendings, pendingmax, pendingcnt, );	342	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
121	pendings [pendingcnt - 1].w = w;	343	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
122	pendings [pendingcnt - 1].events = events;	344	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
123	}	345	}
124		346
125	static void	347	static void
		348	queue_events (EV_P_ W *events, int eventcnt, int type)
		349	{
		350	int i;
		351
		352	for (i = 0; i < eventcnt; ++i)
		353	ev_feed_event (EV_A_ events [i], type);
		354	}
		355
		356	inline void
126	fd_event (int fd, int events)	357	fd_event (EV_P_ int fd, int revents)
127	{	358	{
128	ANFD *anfd = anfds + fd;	359	ANFD *anfd = anfds + fd;
129	struct ev_io *w;	360	struct ev_io *w;
130		361
131	for (w = anfd->head; w; w = w->next)	362	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
132	{	363	{
133	int ev = w->events & events;	364	int ev = w->events & revents;
134		365
135	if (ev)	366	if (ev)
136	event ((struct ev_watcher *)w, ev);	367	ev_feed_event (EV_A_ (W)w, ev);
		368	}
		369	}
		370
		371	void
		372	ev_feed_fd_event (EV_P_ int fd, int revents)
		373	{
		374	fd_event (EV_A_ fd, revents);
		375	}
		376
		377	/*****************************************************************************/
		378
		379	static void
		380	fd_reify (EV_P)
		381	{
		382	int i;
		383
		384	for (i = 0; i < fdchangecnt; ++i)
		385	{
		386	int fd = fdchanges [i];
		387	ANFD *anfd = anfds + fd;
		388	struct ev_io *w;
		389
		390	int events = 0;
		391
		392	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		393	events |= w->events;
		394
		395	anfd->reify = 0;
		396
		397	method_modify (EV_A_ fd, anfd->events, events);
		398	anfd->events = events;
		399	}
		400
		401	fdchangecnt = 0;
		402	}
		403
		404	static void
		405	fd_change (EV_P_ int fd)
		406	{
		407	if (anfds [fd].reify)
		408	return;
		409
		410	anfds [fd].reify = 1;
		411
		412	++fdchangecnt;
		413	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		414	fdchanges [fdchangecnt - 1] = fd;
		415	}
		416
		417	static void
		418	fd_kill (EV_P_ int fd)
		419	{
		420	struct ev_io *w;
		421
		422	while ((w = (struct ev_io *)anfds [fd].head))
		423	{
		424	ev_io_stop (EV_A_ w);
		425	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		426	}
		427	}
		428
		429	static int
		430	fd_valid (int fd)
		431	{
		432	#ifdef WIN32
		433	return !!win32_get_osfhandle (fd);
		434	#else
		435	return fcntl (fd, F_GETFD) != -1;
		436	#endif
		437	}
		438
		439	/* called on EBADF to verify fds */
		440	static void
		441	fd_ebadf (EV_P)
		442	{
		443	int fd;
		444
		445	for (fd = 0; fd < anfdmax; ++fd)
		446	if (anfds [fd].events)
		447	if (!fd_valid (fd) == -1 && errno == EBADF)
		448	fd_kill (EV_A_ fd);
		449	}
		450
		451	/* called on ENOMEM in select/poll to kill some fds and retry */
		452	static void
		453	fd_enomem (EV_P)
		454	{
		455	int fd;
		456
		457	for (fd = anfdmax; fd--; )
		458	if (anfds [fd].events)
		459	{
		460	fd_kill (EV_A_ fd);
		461	return;
137	}	462	}
138	}	463	}
139		464
140	static struct ev_timer **atimers;	465	/* usually called after fork if method needs to re-arm all fds from scratch */
141	static int atimermax, atimercnt;
142
143	static struct ev_timer **rtimers;
144	static int rtimermax, rtimercnt;
145
146	static void	466	static void
147	upheap (struct ev_timer **timers, int k)	467	fd_rearm_all (EV_P)
148	{	468	{
149	struct ev_timer *w = timers [k];	469	int fd;
150		470
		471	/* this should be highly optimised to not do anything but set a flag */
		472	for (fd = 0; fd < anfdmax; ++fd)
		473	if (anfds [fd].events)
		474	{
		475	anfds [fd].events = 0;
		476	fd_change (EV_A_ fd);
		477	}
		478	}
		479
		480	/*****************************************************************************/
		481
		482	static void
		483	upheap (WT *heap, int k)
		484	{
		485	WT w = heap [k];
		486
151	while (k && timers [k >> 1]->at > w->at)	487	while (k && heap [k >> 1]->at > w->at)
152	{	488	{
153	timers [k] = timers [k >> 1];	489	heap [k] = heap [k >> 1];
154	timers [k]->active = k + 1;	490	((W)heap [k])->active = k + 1;
155	k >>= 1;	491	k >>= 1;
156	}	492	}
157		493
158	timers [k] = w;	494	heap [k] = w;
159	timers [k]->active = k + 1;	495	((W)heap [k])->active = k + 1;
160		496
161	}	497	}
162		498
163	static void	499	static void
164	downheap (struct ev_timer **timers, int N, int k)	500	downheap (WT *heap, int N, int k)
165	{	501	{
166	struct ev_timer *w = timers [k];	502	WT w = heap [k];
167		503
168	while (k < (N >> 1))	504	while (k < (N >> 1))
169	{	505	{
170	int j = k << 1;	506	int j = k << 1;
171		507
172	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	508	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
173	++j;	509	++j;
174		510
175	if (w->at <= timers [j]->at)	511	if (w->at <= heap [j]->at)
176	break;	512	break;
177		513
178	timers [k] = timers [j];	514	heap [k] = heap [j];
179	timers [k]->active = k + 1;	515	((W)heap [k])->active = k + 1;
180	k = j;	516	k = j;
181	}	517	}
182		518
183	timers [k] = w;	519	heap [k] = w;
184	timers [k]->active = k + 1;	520	((W)heap [k])->active = k + 1;
185	}	521	}
		522
		523	/*****************************************************************************/
186		524
187	typedef struct	525	typedef struct
188	{	526	{
189	struct ev_signal *head;	527	WL head;
190	sig_atomic_t gotsig;	528	sig_atomic_t volatile gotsig;
191	} ANSIG;	529	} ANSIG;
192		530
193	static ANSIG *signals;	531	static ANSIG *signals;
194	static int signalmax;	532	static int signalmax;
195		533
196	static int sigpipe [2];	534	static int sigpipe [2];
197	static sig_atomic_t gotsig;	535	static sig_atomic_t volatile gotsig;
198	static struct ev_io sigev;	536	static struct ev_io sigev;
199		537
200	static void	538	static void
201	signals_init (ANSIG *base, int count)	539	signals_init (ANSIG *base, int count)
202	{	540	{
203	while (count--)	541	while (count--)
204	{	542	{
205	base->head = 0;	543	base->head = 0;
206	base->gotsig = 0;	544	base->gotsig = 0;
		545
207	++base;	546	++base;
208	}	547	}
209	}	548	}
210		549
211	static void	550	static void
212	sighandler (int signum)	551	sighandler (int signum)
213	{	552	{
		553	#if WIN32
		554	signal (signum, sighandler);
		555	#endif
		556
214	signals [signum - 1].gotsig = 1;	557	signals [signum - 1].gotsig = 1;
215		558
216	if (!gotsig)	559	if (!gotsig)
217	{	560	{
		561	int old_errno = errno;
218	gotsig = 1;	562	gotsig = 1;
		563	#ifdef WIN32
		564	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		565	#else
219	write (sigpipe [1], &gotsig, 1);	566	write (sigpipe [1], &signum, 1);
		567	#endif
		568	errno = old_errno;
220	}	569	}
221	}	570	}
222		571
		572	void
		573	ev_feed_signal_event (EV_P_ int signum)
		574	{
		575	WL w;
		576
		577	#if EV_MULTIPLICITY
		578	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		579	#endif
		580
		581	--signum;
		582
		583	if (signum < 0 || signum >= signalmax)
		584	return;
		585
		586	signals [signum].gotsig = 0;
		587
		588	for (w = signals [signum].head; w; w = w->next)
		589	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		590	}
		591
223	static void	592	static void
224	sigcb (struct ev_io *iow, int revents)	593	sigcb (EV_P_ struct ev_io *iow, int revents)
225	{	594	{
226	struct ev_signal *w;
227	int sig;	595	int signum;
228		596
		597	#ifdef WIN32
		598	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		599	#else
		600	read (sigpipe [0], &revents, 1);
		601	#endif
229	gotsig = 0;	602	gotsig = 0;
230	read (sigpipe [0], &revents, 1);
231		603
232	for (sig = signalmax; sig--; )	604	for (signum = signalmax; signum--; )
233	if (signals [sig].gotsig)	605	if (signals [signum].gotsig)
234	{	606	ev_feed_signal_event (EV_A_ signum + 1);
235	signals [sig].gotsig = 0;
236
237	for (w = signals [sig].head; w; w = w->next)
238	event ((struct ev_watcher *)w, EV_SIGNAL);
239	}
240	}	607	}
241		608
242	static void	609	static void
243	siginit (void)	610	siginit (EV_P)
244	{	611	{
		612	#ifndef WIN32
245	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	613	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
246	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	614	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
247		615
248	/* rather than sort out wether we really need nb, set it */	616	/* rather than sort out wether we really need nb, set it */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	617	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	618	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		619	#endif
251		620
252	evio_set (&sigev, sigpipe [0], EV_READ);	621	ev_io_set (&sigev, sigpipe [0], EV_READ);
253	evio_start (&sigev);	622	ev_io_start (EV_A_ &sigev);
		623	ev_unref (EV_A); /* child watcher should not keep loop alive */
254	}	624	}
255		625
		626	/*****************************************************************************/
		627
		628	static struct ev_child *childs [PID_HASHSIZE];
		629
		630	#ifndef WIN32
		631
		632	static struct ev_signal childev;
		633
		634	#ifndef WCONTINUED
		635	# define WCONTINUED 0
		636	#endif
		637
		638	static void
		639	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		640	{
		641	struct ev_child *w;
		642
		643	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		644	if (w->pid == pid || !w->pid)
		645	{
		646	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		647	w->rpid = pid;
		648	w->rstatus = status;
		649	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		650	}
		651	}
		652
		653	static void
		654	childcb (EV_P_ struct ev_signal *sw, int revents)
		655	{
		656	int pid, status;
		657
		658	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		659	{
		660	/* make sure we are called again until all childs have been reaped */
		661	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		662
		663	child_reap (EV_A_ sw, pid, pid, status);
		664	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		665	}
		666	}
		667
		668	#endif
		669
		670	/*****************************************************************************/
		671
		672	#if EV_USE_KQUEUE
		673	# include "ev_kqueue.c"
		674	#endif
256	#if HAVE_EPOLL	675	#if EV_USE_EPOLL
257	# include "ev_epoll.c"	676	# include "ev_epoll.c"
258	#endif	677	#endif
		678	#if EV_USE_POLL
		679	# include "ev_poll.c"
		680	#endif
259	#if HAVE_SELECT	681	#if EV_USE_SELECT
260	# include "ev_select.c"	682	# include "ev_select.c"
261	#endif	683	#endif
262		684
263	int ev_init (int flags)	685	int
		686	ev_version_major (void)
264	{	687	{
		688	return EV_VERSION_MAJOR;
		689	}
		690
		691	int
		692	ev_version_minor (void)
		693	{
		694	return EV_VERSION_MINOR;
		695	}
		696
		697	/* return true if we are running with elevated privileges and should ignore env variables */
		698	static int
		699	enable_secure (void)
		700	{
		701	#ifdef WIN32
		702	return 0;
		703	#else
		704	return getuid () != geteuid ()
		705	|| getgid () != getegid ();
		706	#endif
		707	}
		708
		709	int
		710	ev_method (EV_P)
		711	{
		712	return method;
		713	}
		714
		715	static void
		716	loop_init (EV_P_ int methods)
		717	{
		718	if (!method)
		719	{
265	#if HAVE_MONOTONIC	720	#if EV_USE_MONOTONIC
266	{	721	{
267	struct timespec ts;	722	struct timespec ts;
268	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	723	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269	have_monotonic = 1;	724	have_monotonic = 1;
270	}	725	}
271	#endif	726	#endif
272		727
273	ev_now = ev_time ();	728	rt_now = ev_time ();
274	now = get_clock ();	729	mn_now = get_clock ();
275	diff = ev_now - now;	730	now_floor = mn_now;
		731	rtmn_diff = rt_now - mn_now;
276		732
277	if (pipe (sigpipe))	733	if (methods == EVMETHOD_AUTO)
278	return 0;	734	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		735	methods = atoi (getenv ("LIBEV_METHODS"));
		736	else
		737	methods = EVMETHOD_ANY;
279		738
280	ev_method = EVMETHOD_NONE;	739	method = 0;
		740	#if EV_USE_WIN32
		741	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		742	#endif
		743	#if EV_USE_KQUEUE
		744	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		745	#endif
281	#if HAVE_EPOLL	746	#if EV_USE_EPOLL
282	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	747	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
283	#endif	748	#endif
		749	#if EV_USE_POLL
		750	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		751	#endif
284	#if HAVE_SELECT	752	#if EV_USE_SELECT
285	if (ev_method == EVMETHOD_NONE) select_init (flags);	753	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
286	#endif	754	#endif
287		755
288	if (ev_method)
289	{
290	evw_init (&sigev, sigcb, 0);	756	ev_watcher_init (&sigev, sigcb);
291	siginit ();	757	ev_set_priority (&sigev, EV_MAXPRI);
292	}	758	}
293
294	return ev_method;
295	}	759	}
296		760
297	void ev_prefork (void)	761	void
298	{	762	loop_destroy (EV_P)
299	}
300
301	void ev_postfork_parent (void)
302	{
303	}
304
305	void ev_postfork_child (void)
306	{
307	#if HAVE_EPOLL
308	if (ev_method == EVMETHOD_EPOLL)
309	epoll_postfork_child ();
310	#endif
311
312	evio_stop (&sigev);
313	close (sigpipe [0]);
314	close (sigpipe [1]);
315	pipe (sigpipe);
316	siginit ();
317	}
318
319	static void
320	fd_reify (void)
321	{	763	{
322	int i;	764	int i;
323		765
324	for (i = 0; i < fdchangecnt; ++i)	766	#if EV_USE_WIN32
		767	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		768	#endif
		769	#if EV_USE_KQUEUE
		770	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		771	#endif
		772	#if EV_USE_EPOLL
		773	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		774	#endif
		775	#if EV_USE_POLL
		776	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		777	#endif
		778	#if EV_USE_SELECT
		779	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		780	#endif
		781
		782	for (i = NUMPRI; i--; )
		783	array_free (pending, [i]);
		784
		785	/* have to use the microsoft-never-gets-it-right macro */
		786	array_free_microshit (fdchange);
		787	array_free_microshit (timer);
		788	array_free_microshit (periodic);
		789	array_free_microshit (idle);
		790	array_free_microshit (prepare);
		791	array_free_microshit (check);
		792
		793	method = 0;
		794	}
		795
		796	static void
		797	loop_fork (EV_P)
		798	{
		799	#if EV_USE_EPOLL
		800	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		801	#endif
		802	#if EV_USE_KQUEUE
		803	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		804	#endif
		805
		806	if (ev_is_active (&sigev))
		807	{
		808	/* default loop */
		809
		810	ev_ref (EV_A);
		811	ev_io_stop (EV_A_ &sigev);
		812	close (sigpipe [0]);
		813	close (sigpipe [1]);
		814
		815	while (pipe (sigpipe))
		816	syserr ("(libev) error creating pipe");
		817
		818	siginit (EV_A);
325	{	819	}
326	int fd = fdchanges [i];
327	ANFD *anfd = anfds + fd;
328	struct ev_io *w;
329		820
330	int wev = 0;	821	postfork = 0;
		822	}
331		823
332	for (w = anfd->head; w; w = w->next)	824	#if EV_MULTIPLICITY
333	wev |= w->events;	825	struct ev_loop *
		826	ev_loop_new (int methods)
		827	{
		828	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
334		829
335	if (anfd->wev != wev)	830	memset (loop, 0, sizeof (struct ev_loop));
		831
		832	loop_init (EV_A_ methods);
		833
		834	if (ev_method (EV_A))
		835	return loop;
		836
		837	return 0;
		838	}
		839
		840	void
		841	ev_loop_destroy (EV_P)
		842	{
		843	loop_destroy (EV_A);
		844	ev_free (loop);
		845	}
		846
		847	void
		848	ev_loop_fork (EV_P)
		849	{
		850	postfork = 1;
		851	}
		852
		853	#endif
		854
		855	#if EV_MULTIPLICITY
		856	struct ev_loop *
		857	#else
		858	int
		859	#endif
		860	ev_default_loop (int methods)
		861	{
		862	if (sigpipe [0] == sigpipe [1])
		863	if (pipe (sigpipe))
		864	return 0;
		865
		866	if (!default_loop)
		867	{
		868	#if EV_MULTIPLICITY
		869	struct ev_loop *loop = default_loop = &default_loop_struct;
		870	#else
		871	default_loop = 1;
		872	#endif
		873
		874	loop_init (EV_A_ methods);
		875
		876	if (ev_method (EV_A))
336	{	877	{
337	method_modify (fd, anfd->wev, wev);	878	siginit (EV_A);
338	anfd->wev = wev;	879
		880	#ifndef WIN32
		881	ev_signal_init (&childev, childcb, SIGCHLD);
		882	ev_set_priority (&childev, EV_MAXPRI);
		883	ev_signal_start (EV_A_ &childev);
		884	ev_unref (EV_A); /* child watcher should not keep loop alive */
		885	#endif
339	}	886	}
		887	else
		888	default_loop = 0;
340	}	889	}
341		890
342	fdchangecnt = 0;	891	return default_loop;
343	}	892	}
344		893
		894	void
		895	ev_default_destroy (void)
		896	{
		897	#if EV_MULTIPLICITY
		898	struct ev_loop *loop = default_loop;
		899	#endif
		900
		901	#ifndef WIN32
		902	ev_ref (EV_A); /* child watcher */
		903	ev_signal_stop (EV_A_ &childev);
		904	#endif
		905
		906	ev_ref (EV_A); /* signal watcher */
		907	ev_io_stop (EV_A_ &sigev);
		908
		909	close (sigpipe [0]); sigpipe [0] = 0;
		910	close (sigpipe [1]); sigpipe [1] = 0;
		911
		912	loop_destroy (EV_A);
		913	}
		914
		915	void
		916	ev_default_fork (void)
		917	{
		918	#if EV_MULTIPLICITY
		919	struct ev_loop *loop = default_loop;
		920	#endif
		921
		922	if (method)
		923	postfork = 1;
		924	}
		925
		926	/*****************************************************************************/
		927
345	static void	928	static int
346	call_pending ()	929	any_pending (EV_P)
347	{	930	{
348	int i;	931	int pri;
349		932
350	for (i = 0; i < pendingcnt; ++i)	933	for (pri = NUMPRI; pri--; )
		934	if (pendingcnt [pri])
		935	return 1;
		936
		937	return 0;
		938	}
		939
		940	static void
		941	call_pending (EV_P)
		942	{
		943	int pri;
		944
		945	for (pri = NUMPRI; pri--; )
		946	while (pendingcnt [pri])
351	{	947	{
352	ANPENDING *p = pendings + i;	948	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
353		949
354	if (p->w)	950	if (p->w)
355	{	951	{
356	p->w->pending = 0;	952	p->w->pending = 0;
357	p->w->cb (p->w, p->events);	953	EV_CB_INVOKE (p->w, p->events);
358	}	954	}
359	}	955	}
360
361	pendingcnt = 0;
362	}	956	}
363		957
364	static void	958	static void
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	959	timers_reify (EV_P)
366	{	960	{
367	while (timercnt && timers [0]->at <= now)	961	while (timercnt && ((WT)timers [0])->at <= mn_now)
368	{	962	{
369	struct ev_timer *w = timers [0];	963	struct ev_timer *w = timers [0];
		964
		965	assert (("inactive timer on timer heap detected", ev_is_active (w)));
370		966
371	/* first reschedule or stop timer */	967	/* first reschedule or stop timer */
372	if (w->repeat)	968	if (w->repeat)
373	{	969	{
374	if (w->is_abs)	970	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
375	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
376	else
377	w->at = now + w->repeat;	971	((WT)w)->at = mn_now + w->repeat;
378
379	assert (w->at > now);
380
381	downheap (timers, timercnt, 0);	972	downheap ((WT *)timers, timercnt, 0);
382	}	973	}
383	else	974	else
		975	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		976
		977	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		978	}
		979	}
		980
		981	static void
		982	periodics_reify (EV_P)
		983	{
		984	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		985	{
		986	struct ev_periodic *w = periodics [0];
		987
		988	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		989
		990	/* first reschedule or stop timer */
		991	if (w->reschedule_cb)
384	{	992	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	993	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, rt_now + 0.0001);
386	--timercnt; /* maybe pass by reference instead? */	994
		995	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > rt_now));
		996	downheap ((WT *)periodics, periodiccnt, 0);
387	}	997	}
		998	else if (w->interval)
		999	{
		1000	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1001	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		1002	downheap ((WT *)periodics, periodiccnt, 0);
		1003	}
		1004	else
		1005	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
388		1006
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	1007	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
390	}	1008	}
391	}	1009	}
392		1010
393	static void	1011	static void
394	time_update ()	1012	periodics_reschedule (EV_P)
395	{	1013	{
396	int i;	1014	int i;
		1015
		1016	/* adjust periodics after time jump */
		1017	for (i = 0; i < periodiccnt; ++i)
		1018	{
		1019	struct ev_periodic *w = periodics [i];
		1020
		1021	if (w->reschedule_cb)
		1022	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1023	else if (w->interval)
		1024	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1025	}
		1026
		1027	/* now rebuild the heap */
		1028	for (i = periodiccnt >> 1; i--; )
		1029	downheap ((WT *)periodics, periodiccnt, i);
		1030	}
		1031
		1032	inline int
		1033	time_update_monotonic (EV_P)
		1034	{
		1035	mn_now = get_clock ();
		1036
		1037	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1038	{
		1039	rt_now = rtmn_diff + mn_now;
		1040	return 0;
		1041	}
		1042	else
		1043	{
		1044	now_floor = mn_now;
397	ev_now = ev_time ();	1045	rt_now = ev_time ();
398		1046	return 1;
399	if (have_monotonic)
400	{	1047	}
401	ev_tstamp odiff = diff;	1048	}
402		1049
403	/* detecting time jumps is much more difficult */	1050	static void
404	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1051	time_update (EV_P)
		1052	{
		1053	int i;
		1054
		1055	#if EV_USE_MONOTONIC
		1056	if (expect_true (have_monotonic))
		1057	{
		1058	if (time_update_monotonic (EV_A))
405	{	1059	{
406	now = get_clock ();	1060	ev_tstamp odiff = rtmn_diff;
		1061
		1062	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1063	{
407	diff = ev_now - now;	1064	rtmn_diff = rt_now - mn_now;
408		1065
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1066	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
410	return; /* all is well */	1067	return; /* all is well */
411		1068
412	ev_now = ev_time ();	1069	rt_now = ev_time ();
		1070	mn_now = get_clock ();
		1071	now_floor = mn_now;
		1072	}
		1073
		1074	periodics_reschedule (EV_A);
		1075	/* no timer adjustment, as the monotonic clock doesn't jump */
		1076	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
413	}	1077	}
		1078	}
		1079	else
		1080	#endif
		1081	{
		1082	rt_now = ev_time ();
414		1083
415	/* time jump detected, reschedule atimers */	1084	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
416	for (i = 0; i < atimercnt; ++i)
417	{	1085	{
418	struct ev_timer *w = atimers [i];	1086	periodics_reschedule (EV_A);
419	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1087
		1088	/* adjust timers. this is easy, as the offset is the same for all */
		1089	for (i = 0; i < timercnt; ++i)
		1090	((WT)timers [i])->at += rt_now - mn_now;
420	}	1091	}
421	}
422	else
423	{
424	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425	/* time jump detected, adjust rtimers */
426	for (i = 0; i < rtimercnt; ++i)
427	rtimers [i]->at += ev_now - now;
428		1092
429	now = ev_now;	1093	mn_now = rt_now;
430	}	1094	}
431	}	1095	}
432		1096
433	int ev_loop_done;	1097	void
		1098	ev_ref (EV_P)
		1099	{
		1100	++activecnt;
		1101	}
434		1102
		1103	void
		1104	ev_unref (EV_P)
		1105	{
		1106	--activecnt;
		1107	}
		1108
		1109	static int loop_done;
		1110
		1111	void
435	void ev_loop (int flags)	1112	ev_loop (EV_P_ int flags)
436	{	1113	{
437	double block;	1114	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	1115	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
439		1116
440	do	1117	do
441	{	1118	{
		1119	/* queue check watchers (and execute them) */
		1120	if (expect_false (preparecnt))
		1121	{
		1122	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1123	call_pending (EV_A);
		1124	}
		1125
		1126	/* we might have forked, so reify kernel state if necessary */
		1127	if (expect_false (postfork))
		1128	loop_fork (EV_A);
		1129
442	/* update fd-related kernel structures */	1130	/* update fd-related kernel structures */
443	fd_reify ();	1131	fd_reify (EV_A);
444		1132
445	/* calculate blocking time */	1133	/* calculate blocking time */
		1134
		1135	/* we only need this for !monotonic clock or timers, but as we basically
		1136	always have timers, we just calculate it always */
		1137	#if EV_USE_MONOTONIC
		1138	if (expect_true (have_monotonic))
		1139	time_update_monotonic (EV_A);
		1140	else
		1141	#endif
		1142	{
		1143	rt_now = ev_time ();
		1144	mn_now = rt_now;
		1145	}
		1146
446	if (flags & EVLOOP_NONBLOCK)	1147	if (flags & EVLOOP_NONBLOCK || idlecnt)
447	block = 0.;	1148	block = 0.;
448	else	1149	else
449	{	1150	{
450	block = MAX_BLOCKTIME;	1151	block = MAX_BLOCKTIME;
451		1152
452	if (rtimercnt)	1153	if (timercnt)
453	{	1154	{
454	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1155	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
455	if (block > to) block = to;	1156	if (block > to) block = to;
456	}	1157	}
457		1158
458	if (atimercnt)	1159	if (periodiccnt)
459	{	1160	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1161	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
461	if (block > to) block = to;	1162	if (block > to) block = to;
462	}	1163	}
463		1164
464	if (block < 0.) block = 0.;	1165	if (block < 0.) block = 0.;
465	}	1166	}
466		1167
467	method_poll (block);	1168	method_poll (EV_A_ block);
468		1169
469	/* update ev_now, do magic */	1170	/* update rt_now, do magic */
470	time_update ();	1171	time_update (EV_A);
471		1172
472	/* put pending timers into pendign queue and reschedule them */	1173	/* queue pending timers and reschedule them */
473	/* absolute timers first */	1174	timers_reify (EV_A); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	1175	periodics_reify (EV_A); /* absolute timers called first */
475	/* relative timers second */
476	timers_reify (rtimers, rtimercnt, now);
477		1176
		1177	/* queue idle watchers unless io or timers are pending */
		1178	if (idlecnt && !any_pending (EV_A))
		1179	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1180
		1181	/* queue check watchers, to be executed first */
		1182	if (checkcnt)
		1183	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1184
478	call_pending ();	1185	call_pending (EV_A);
479	}	1186	}
480	while (!ev_loop_done);	1187	while (activecnt && !loop_done);
481	}
482		1188
483	static void	1189	if (loop_done != 2)
484	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1190	loop_done = 0;
		1191	}
		1192
		1193	void
		1194	ev_unloop (EV_P_ int how)
		1195	{
		1196	loop_done = how;
		1197	}
		1198
		1199	/*****************************************************************************/
		1200
		1201	inline void
		1202	wlist_add (WL *head, WL elem)
485	{	1203	{
486	elem->next = *head;	1204	elem->next = *head;
487	*head = elem;	1205	*head = elem;
488	}	1206	}
489		1207
490	static void	1208	inline void
491	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1209	wlist_del (WL *head, WL elem)
492	{	1210	{
493	while (*head)	1211	while (*head)
494	{	1212	{
495	if (*head == elem)	1213	if (*head == elem)
496	{	1214	{
…		…
500		1218
501	head = &(*head)->next;	1219	head = &(*head)->next;
502	}	1220	}
503	}	1221	}
504		1222
505	static void	1223	inline void
506	ev_start (struct ev_watcher *w, int active)	1224	ev_clear_pending (EV_P_ W w)
507	{	1225	{
		1226	if (w->pending)
		1227	{
		1228	pendings [ABSPRI (w)][w->pending - 1].w = 0;
508	w->pending = 0;	1229	w->pending = 0;
		1230	}
		1231	}
		1232
		1233	inline void
		1234	ev_start (EV_P_ W w, int active)
		1235	{
		1236	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1237	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1238
509	w->active = active;	1239	w->active = active;
		1240	ev_ref (EV_A);
510	}	1241	}
511		1242
512	static void	1243	inline void
513	ev_stop (struct ev_watcher *w)	1244	ev_stop (EV_P_ W w)
514	{	1245	{
515	if (w->pending)	1246	ev_unref (EV_A);
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	1247	w->active = 0;
519	/* nop */
520	}	1248	}
521		1249
		1250	/*****************************************************************************/
		1251
522	void	1252	void
523	evio_start (struct ev_io *w)	1253	ev_io_start (EV_P_ struct ev_io *w)
524	{	1254	{
		1255	int fd = w->fd;
		1256
525	if (ev_is_active (w))	1257	if (ev_is_active (w))
526	return;	1258	return;
527		1259
528	int fd = w->fd;	1260	assert (("ev_io_start called with negative fd", fd >= 0));
529		1261
530	ev_start ((struct ev_watcher *)w, 1);	1262	ev_start (EV_A_ (W)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1263	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1264	wlist_add ((WL *)&anfds[fd].head, (WL)w);
533		1265
534	++fdchangecnt;	1266	fd_change (EV_A_ fd);
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}	1267	}
538		1268
539	void	1269	void
540	evio_stop (struct ev_io *w)	1270	ev_io_stop (EV_P_ struct ev_io *w)
541	{	1271	{
		1272	ev_clear_pending (EV_A_ (W)w);
542	if (!ev_is_active (w))	1273	if (!ev_is_active (w))
543	return;	1274	return;
544		1275
545	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1276	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
546	ev_stop ((struct ev_watcher *)w);	1277	ev_stop (EV_A_ (W)w);
547		1278
548	++fdchangecnt;	1279	fd_change (EV_A_ w->fd);
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}	1280	}
552		1281
553	void	1282	void
554	evtimer_start (struct ev_timer *w)	1283	ev_timer_start (EV_P_ struct ev_timer *w)
555	{	1284	{
556	if (ev_is_active (w))	1285	if (ev_is_active (w))
557	return;	1286	return;
558		1287
559	if (w->is_abs)	1288	((WT)w)->at += mn_now;
		1289
		1290	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1291
		1292	ev_start (EV_A_ (W)w, ++timercnt);
		1293	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1294	timers [timercnt - 1] = w;
		1295	upheap ((WT *)timers, timercnt - 1);
		1296
		1297	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1298	}
		1299
		1300	void
		1301	ev_timer_stop (EV_P_ struct ev_timer *w)
		1302	{
		1303	ev_clear_pending (EV_A_ (W)w);
		1304	if (!ev_is_active (w))
		1305	return;
		1306
		1307	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1308
		1309	if (((W)w)->active < timercnt--)
		1310	{
		1311	timers [((W)w)->active - 1] = timers [timercnt];
		1312	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
560	{	1313	}
561	/* this formula differs from the one in timer_reify becuse we do not round up */	1314
		1315	((WT)w)->at = w->repeat;
		1316
		1317	ev_stop (EV_A_ (W)w);
		1318	}
		1319
		1320	void
		1321	ev_timer_again (EV_P_ struct ev_timer *w)
		1322	{
		1323	if (ev_is_active (w))
		1324	{
562	if (w->repeat)	1325	if (w->repeat)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1326	{
564		1327	((WT)w)->at = mn_now + w->repeat;
565	ev_start ((struct ev_watcher *)w, ++atimercnt);	1328	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
566	array_needsize (atimers, atimermax, atimercnt, );	1329	}
567	atimers [atimercnt - 1] = w;
568	upheap (atimers, atimercnt - 1);
569	}
570	else	1330	else
		1331	ev_timer_stop (EV_A_ w);
571	{	1332	}
572	w->at += now;	1333	else if (w->repeat)
		1334	ev_timer_start (EV_A_ w);
		1335	}
573		1336
574	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1337	void
575	array_needsize (rtimers, rtimermax, rtimercnt, );	1338	ev_periodic_start (EV_P_ struct ev_periodic *w)
576	rtimers [rtimercnt - 1] = w;	1339	{
577	upheap (rtimers, rtimercnt - 1);	1340	if (ev_is_active (w))
		1341	return;
		1342
		1343	if (w->reschedule_cb)
		1344	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1345	else if (w->interval)
578	}	1346	{
		1347	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1348	/* this formula differs from the one in periodic_reify because we do not always round up */
		1349	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1350	}
579		1351
580	}	1352	ev_start (EV_A_ (W)w, ++periodiccnt);
		1353	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1354	periodics [periodiccnt - 1] = w;
		1355	upheap ((WT *)periodics, periodiccnt - 1);
581		1356
		1357	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1358	}
		1359
582	void	1360	void
583	evtimer_stop (struct ev_timer *w)	1361	ev_periodic_stop (EV_P_ struct ev_periodic *w)
584	{	1362	{
		1363	ev_clear_pending (EV_A_ (W)w);
585	if (!ev_is_active (w))	1364	if (!ev_is_active (w))
586	return;	1365	return;
587		1366
588	if (w->is_abs)	1367	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
589	{	1368
590	if (w->active < atimercnt--)	1369	if (((W)w)->active < periodiccnt--)
591	{
592	atimers [w->active - 1] = atimers [atimercnt];
593	downheap (atimers, atimercnt, w->active - 1);
594	}
595	}	1370	{
596	else	1371	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1372	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
597	{	1373	}
598	if (w->active < rtimercnt--)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}
604		1374
605	ev_stop ((struct ev_watcher *)w);	1375	ev_stop (EV_A_ (W)w);
606	}	1376	}
607		1377
608	void	1378	void
609	evsignal_start (struct ev_signal *w)	1379	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1380	{
		1381	ev_periodic_stop (EV_A_ w);
		1382	ev_periodic_start (EV_A_ w);
		1383	}
		1384
		1385	void
		1386	ev_idle_start (EV_P_ struct ev_idle *w)
610	{	1387	{
611	if (ev_is_active (w))	1388	if (ev_is_active (w))
612	return;	1389	return;
613		1390
614	ev_start ((struct ev_watcher *)w, 1);	1391	ev_start (EV_A_ (W)w, ++idlecnt);
		1392	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1393	idles [idlecnt - 1] = w;
		1394	}
		1395
		1396	void
		1397	ev_idle_stop (EV_P_ struct ev_idle *w)
		1398	{
		1399	ev_clear_pending (EV_A_ (W)w);
		1400	if (ev_is_active (w))
		1401	return;
		1402
		1403	idles [((W)w)->active - 1] = idles [--idlecnt];
		1404	ev_stop (EV_A_ (W)w);
		1405	}
		1406
		1407	void
		1408	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1409	{
		1410	if (ev_is_active (w))
		1411	return;
		1412
		1413	ev_start (EV_A_ (W)w, ++preparecnt);
		1414	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1415	prepares [preparecnt - 1] = w;
		1416	}
		1417
		1418	void
		1419	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1420	{
		1421	ev_clear_pending (EV_A_ (W)w);
		1422	if (ev_is_active (w))
		1423	return;
		1424
		1425	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1426	ev_stop (EV_A_ (W)w);
		1427	}
		1428
		1429	void
		1430	ev_check_start (EV_P_ struct ev_check *w)
		1431	{
		1432	if (ev_is_active (w))
		1433	return;
		1434
		1435	ev_start (EV_A_ (W)w, ++checkcnt);
		1436	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1437	checks [checkcnt - 1] = w;
		1438	}
		1439
		1440	void
		1441	ev_check_stop (EV_P_ struct ev_check *w)
		1442	{
		1443	ev_clear_pending (EV_A_ (W)w);
		1444	if (ev_is_active (w))
		1445	return;
		1446
		1447	checks [((W)w)->active - 1] = checks [--checkcnt];
		1448	ev_stop (EV_A_ (W)w);
		1449	}
		1450
		1451	#ifndef SA_RESTART
		1452	# define SA_RESTART 0
		1453	#endif
		1454
		1455	void
		1456	ev_signal_start (EV_P_ struct ev_signal *w)
		1457	{
		1458	#if EV_MULTIPLICITY
		1459	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1460	#endif
		1461	if (ev_is_active (w))
		1462	return;
		1463
		1464	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1465
		1466	ev_start (EV_A_ (W)w, 1);
615	array_needsize (signals, signalmax, w->signum, signals_init);	1467	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
616	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1468	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
617		1469
618	if (!w->next)	1470	if (!((WL)w)->next)
619	{	1471	{
		1472	#if WIN32
		1473	signal (w->signum, sighandler);
		1474	#else
620	struct sigaction sa;	1475	struct sigaction sa;
621	sa.sa_handler = sighandler;	1476	sa.sa_handler = sighandler;
622	sigfillset (&sa.sa_mask);	1477	sigfillset (&sa.sa_mask);
623	sa.sa_flags = 0;	1478	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
624	sigaction (w->signum, &sa, 0);	1479	sigaction (w->signum, &sa, 0);
		1480	#endif
625	}	1481	}
626	}	1482	}
627		1483
628	void	1484	void
629	evsignal_stop (struct ev_signal *w)	1485	ev_signal_stop (EV_P_ struct ev_signal *w)
630	{	1486	{
		1487	ev_clear_pending (EV_A_ (W)w);
631	if (!ev_is_active (w))	1488	if (!ev_is_active (w))
632	return;	1489	return;
633		1490
634	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1491	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
635	ev_stop ((struct ev_watcher *)w);	1492	ev_stop (EV_A_ (W)w);
636		1493
637	if (!signals [w->signum - 1].head)	1494	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	1495	signal (w->signum, SIG_DFL);
639	}	1496	}
640		1497
		1498	void
		1499	ev_child_start (EV_P_ struct ev_child *w)
		1500	{
		1501	#if EV_MULTIPLICITY
		1502	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1503	#endif
		1504	if (ev_is_active (w))
		1505	return;
		1506
		1507	ev_start (EV_A_ (W)w, 1);
		1508	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1509	}
		1510
		1511	void
		1512	ev_child_stop (EV_P_ struct ev_child *w)
		1513	{
		1514	ev_clear_pending (EV_A_ (W)w);
		1515	if (ev_is_active (w))
		1516	return;
		1517
		1518	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1519	ev_stop (EV_A_ (W)w);
		1520	}
		1521
641	/*****************************************************************************/	1522	/*****************************************************************************/
642	#if 1
643		1523
644	static void	1524	struct ev_once
645	sin_cb (struct ev_io *w, int revents)
646	{	1525	{
647	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
648	}
649
650	static void
651	ocb (struct ev_timer *w, int revents)
652	{
653	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
654	evtimer_stop (w);
655	evtimer_start (w);
656	}
657
658	static void
659	scb (struct ev_signal *w, int revents)
660	{
661	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
662	}
663
664	int main (void)
665	{
666	struct ev_io sin;	1526	struct ev_io io;
667
668	ev_init (0);
669
670	evw_init (&sin, sin_cb, 55);
671	evio_set (&sin, 0, EV_READ);
672	evio_start (&sin);
673
674	struct ev_timer t[10000];
675
676	#if 0
677	int i;
678	for (i = 0; i < 10000; ++i)
679	{
680	struct ev_timer *w = t + i;
681	evw_init (w, ocb, i);
682	evtimer_set_abs (w, drand48 (), 0.99775533);
683	evtimer_start (w);
684	if (drand48 () < 0.5)
685	evtimer_stop (w);
686	}
687	#endif
688
689	struct ev_timer t1;	1527	struct ev_timer to;
690	evw_init (&t1, ocb, 0);	1528	void (*cb)(int revents, void *arg);
691	evtimer_set_abs (&t1, 5, 10);	1529	void *arg;
692	evtimer_start (&t1);	1530	};
693		1531
694	struct ev_signal sig;	1532	static void
695	evw_init (&sig, scb, 65535);	1533	once_cb (EV_P_ struct ev_once *once, int revents)
696	evsignal_set (&sig, SIGQUIT);	1534	{
697	evsignal_start (&sig);	1535	void (*cb)(int revents, void *arg) = once->cb;
		1536	void *arg = once->arg;
698		1537
699	ev_loop (0);	1538	ev_io_stop (EV_A_ &once->io);
		1539	ev_timer_stop (EV_A_ &once->to);
		1540	ev_free (once);
700		1541
701	return 0;	1542	cb (revents, arg);
702	}	1543	}
703		1544
704	#endif	1545	static void
		1546	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1547	{
		1548	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1549	}
705		1550
		1551	static void
		1552	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1553	{
		1554	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1555	}
706		1556
		1557	void
		1558	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1559	{
		1560	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
707		1561
		1562	if (!once)
		1563	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1564	else
		1565	{
		1566	once->cb = cb;
		1567	once->arg = arg;
708		1568
		1569	ev_watcher_init (&once->io, once_cb_io);
		1570	if (fd >= 0)
		1571	{
		1572	ev_io_set (&once->io, fd, events);
		1573	ev_io_start (EV_A_ &once->io);
		1574	}
		1575
		1576	ev_watcher_init (&once->to, once_cb_to);
		1577	if (timeout >= 0.)
		1578	{
		1579	ev_timer_set (&once->to, timeout, 0.);
		1580	ev_timer_start (EV_A_ &once->to);
		1581	}
		1582	}
		1583	}
		1584

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