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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 1.73 by root, Tue Nov 6 16:27:10 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
25	#include "ev.h"	131	#include "ev.h"
26		132
		133	#if __GNUC__ >= 3
		134	# define expect(expr,value) __builtin_expect ((expr),(value))
		135	# define inline inline
		136	#else
		137	# define expect(expr,value) (expr)
		138	# define inline static
		139	#endif
		140
		141	#define expect_false(expr) expect ((expr) != 0, 0)
		142	#define expect_true(expr) expect ((expr) != 0, 1)
		143
		144	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		145	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		146
27	struct ev_watcher {	147	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);	148	typedef struct ev_watcher_list *WL;
		149	typedef struct ev_watcher_time *WT;
		150
		151	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		152
		153	#include "ev_win32.c"
		154
		155	/*****************************************************************************/
		156
		157	static void (*syserr_cb)(const char *msg);
		158
		159	void ev_set_syserr_cb (void (*cb)(const char *msg))
		160	{
		161	syserr_cb = cb;
		162	}
		163
		164	static void
		165	syserr (const char *msg)
		166	{
		167	if (!msg)
		168	msg = "(libev) system error";
		169
		170	if (syserr_cb)
		171	syserr_cb (msg);
		172	else
		173	{
		174	perror (msg);
		175	abort ();
		176	}
		177	}
		178
		179	static void *(*alloc)(void *ptr, long size);
		180
		181	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		182	{
		183	alloc = cb;
		184	}
		185
		186	static void *
		187	ev_realloc (void *ptr, long size)
		188	{
		189	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		190
		191	if (!ptr && size)
		192	{
		193	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		194	abort ();
		195	}
		196
		197	return ptr;
		198	}
		199
		200	#define ev_malloc(size) ev_realloc (0, (size))
		201	#define ev_free(ptr) ev_realloc ((ptr), 0)
		202
		203	/*****************************************************************************/
		204
		205	typedef struct
		206	{
		207	WL head;
		208	unsigned char events;
		209	unsigned char reify;
		210	} ANFD;
		211
		212	typedef struct
		213	{
		214	W w;
		215	int events;
		216	} ANPENDING;
		217
		218	#if EV_MULTIPLICITY
		219
		220	struct ev_loop
		221	{
		222	# define VAR(name,decl) decl;
		223	# include "ev_vars.h"
29	};	224	};
		225	# undef VAR
		226	# include "ev_wrap.h"
30		227
31	struct ev_watcher_list {	228	#else
32	EV_WATCHER_LIST (ev_watcher_list);
33	};
34		229
35	static ev_tstamp now, diff; /* monotonic clock */	230	# define VAR(name,decl) static decl;
36	ev_tstamp ev_now;	231	# include "ev_vars.h"
37	int ev_method;	232	# undef VAR
38		233
39	static int have_monotonic; /* runtime */	234	#endif
40		235
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	236	/*****************************************************************************/
42	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);
44		237
45	ev_tstamp	238	inline ev_tstamp
46	ev_time (void)	239	ev_time (void)
47	{	240	{
48	#if HAVE_REALTIME	241	#if EV_USE_REALTIME
49	struct timespec ts;	242	struct timespec ts;
50	clock_gettime (CLOCK_REALTIME, &ts);	243	clock_gettime (CLOCK_REALTIME, &ts);
51	return ts.tv_sec + ts.tv_nsec * 1e-9;	244	return ts.tv_sec + ts.tv_nsec * 1e-9;
52	#else	245	#else
53	struct timeval tv;	246	struct timeval tv;
54	gettimeofday (&tv, 0);	247	gettimeofday (&tv, 0);
55	return tv.tv_sec + tv.tv_usec * 1e-6;	248	return tv.tv_sec + tv.tv_usec * 1e-6;
56	#endif	249	#endif
57	}	250	}
58		251
59	static ev_tstamp	252	inline ev_tstamp
60	get_clock (void)	253	get_clock (void)
61	{	254	{
62	#if HAVE_MONOTONIC	255	#if EV_USE_MONOTONIC
63	if (have_monotonic)	256	if (expect_true (have_monotonic))
64	{	257	{
65	struct timespec ts;	258	struct timespec ts;
66	clock_gettime (CLOCK_MONOTONIC, &ts);	259	clock_gettime (CLOCK_MONOTONIC, &ts);
67	return ts.tv_sec + ts.tv_nsec * 1e-9;	260	return ts.tv_sec + ts.tv_nsec * 1e-9;
68	}	261	}
69	#endif	262	#endif
70		263
71	return ev_time ();	264	return ev_time ();
72	}	265	}
73		266
		267	ev_tstamp
		268	ev_now (EV_P)
		269	{
		270	return rt_now;
		271	}
		272
		273	#define array_roundsize(base,n) ((n) | 4 & ~3)
		274
74	#define array_needsize(base,cur,cnt,init) \	275	#define array_needsize(base,cur,cnt,init) \
75	if ((cnt) > cur) \	276	if (expect_false ((cnt) > cur)) \
76	{ \	277	{ \
77	int newcnt = cur ? cur << 1 : 16; \	278	int newcnt = cur; \
78	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	279	do \
		280	{ \
		281	newcnt = array_roundsize (base, newcnt << 1); \
		282	} \
		283	while ((cnt) > newcnt); \
		284	\
79	base = realloc (base, sizeof (*base) * (newcnt)); \	285	base = ev_realloc (base, sizeof (*base) * (newcnt)); \
80	init (base + cur, newcnt - cur); \	286	init (base + cur, newcnt - cur); \
81	cur = newcnt; \	287	cur = newcnt; \
82	}	288	}
83		289
84	typedef struct	290	#define array_slim(stem) \
85	{	291	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
86	struct ev_io *head;	292	{ \
87	unsigned char wev, rev; /* want, received event set */	293	stem ## max = array_roundsize (stem ## cnt >> 1); \
88	} ANFD;	294	base = ev_realloc (base, sizeof (*base) * (stem ## max)); \
		295	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		296	}
89		297
90	static ANFD *anfds;	298	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
91	static int anfdmax;	299	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		300	#define array_free_microshit(stem) \
		301	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
92		302
93	static int *fdchanges;	303	#define array_free(stem, idx) \
94	static int fdchangemax, fdchangecnt;	304	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		305
		306	/*****************************************************************************/
95		307
96	static void	308	static void
97	anfds_init (ANFD *base, int count)	309	anfds_init (ANFD *base, int count)
98	{	310	{
99	while (count--)	311	while (count--)
100	{	312	{
101	base->head = 0;	313	base->head = 0;
102	base->wev = base->rev = EV_NONE;	314	base->events = EV_NONE;
		315	base->reify = 0;
		316
103	++base;	317	++base;
104	}	318	}
105	}	319	}
106		320
107	typedef struct
108	{
109	struct ev_watcher *w;
110	int events;
111	} ANPENDING;
112
113	static ANPENDING *pendings;
114	static int pendingmax, pendingcnt;
115
116	static void	321	static void
117	event (struct ev_watcher *w, int events)	322	event (EV_P_ W w, int events)
118	{	323	{
		324	if (w->pending)
		325	{
		326	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		327	return;
		328	}
		329
119	w->pending = ++pendingcnt;	330	w->pending = ++pendingcnt [ABSPRI (w)];
120	array_needsize (pendings, pendingmax, pendingcnt, );	331	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], (void));
121	pendings [pendingcnt - 1].w = w;	332	pendings [ABSPRI (w)][w->pending - 1].w = w;
122	pendings [pendingcnt - 1].events = events;	333	pendings [ABSPRI (w)][w->pending - 1].events = events;
123	}	334	}
124		335
125	static void	336	static void
		337	queue_events (EV_P_ W *events, int eventcnt, int type)
		338	{
		339	int i;
		340
		341	for (i = 0; i < eventcnt; ++i)
		342	event (EV_A_ events [i], type);
		343	}
		344
		345	static void
126	fd_event (int fd, int events)	346	fd_event (EV_P_ int fd, int events)
127	{	347	{
128	ANFD *anfd = anfds + fd;	348	ANFD *anfd = anfds + fd;
129	struct ev_io *w;	349	struct ev_io *w;
130		350
131	for (w = anfd->head; w; w = w->next)	351	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
132	{	352	{
133	int ev = w->events & events;	353	int ev = w->events & events;
134		354
135	if (ev)	355	if (ev)
136	event ((struct ev_watcher *)w, ev);	356	event (EV_A_ (W)w, ev);
		357	}
		358	}
		359
		360	/*****************************************************************************/
		361
		362	static void
		363	fd_reify (EV_P)
		364	{
		365	int i;
		366
		367	for (i = 0; i < fdchangecnt; ++i)
		368	{
		369	int fd = fdchanges [i];
		370	ANFD *anfd = anfds + fd;
		371	struct ev_io *w;
		372
		373	int events = 0;
		374
		375	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		376	events |= w->events;
		377
		378	anfd->reify = 0;
		379
		380	method_modify (EV_A_ fd, anfd->events, events);
		381	anfd->events = events;
		382	}
		383
		384	fdchangecnt = 0;
		385	}
		386
		387	static void
		388	fd_change (EV_P_ int fd)
		389	{
		390	if (anfds [fd].reify)
		391	return;
		392
		393	anfds [fd].reify = 1;
		394
		395	++fdchangecnt;
		396	array_needsize (fdchanges, fdchangemax, fdchangecnt, (void));
		397	fdchanges [fdchangecnt - 1] = fd;
		398	}
		399
		400	static void
		401	fd_kill (EV_P_ int fd)
		402	{
		403	struct ev_io *w;
		404
		405	while ((w = (struct ev_io *)anfds [fd].head))
		406	{
		407	ev_io_stop (EV_A_ w);
		408	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		409	}
		410	}
		411
		412	static int
		413	fd_valid (int fd)
		414	{
		415	#ifdef WIN32
		416	return !!win32_get_osfhandle (fd);
		417	#else
		418	return fcntl (fd, F_GETFD) != -1;
		419	#endif
		420	}
		421
		422	/* called on EBADF to verify fds */
		423	static void
		424	fd_ebadf (EV_P)
		425	{
		426	int fd;
		427
		428	for (fd = 0; fd < anfdmax; ++fd)
		429	if (anfds [fd].events)
		430	if (!fd_valid (fd) == -1 && errno == EBADF)
		431	fd_kill (EV_A_ fd);
		432	}
		433
		434	/* called on ENOMEM in select/poll to kill some fds and retry */
		435	static void
		436	fd_enomem (EV_P)
		437	{
		438	int fd;
		439
		440	for (fd = anfdmax; fd--; )
		441	if (anfds [fd].events)
		442	{
		443	fd_kill (EV_A_ fd);
		444	return;
137	}	445	}
138	}	446	}
139		447
140	static struct ev_timer **atimers;	448	/* 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	449	static void
147	upheap (struct ev_timer **timers, int k)	450	fd_rearm_all (EV_P)
148	{	451	{
149	struct ev_timer *w = timers [k];	452	int fd;
150		453
		454	/* this should be highly optimised to not do anything but set a flag */
		455	for (fd = 0; fd < anfdmax; ++fd)
		456	if (anfds [fd].events)
		457	{
		458	anfds [fd].events = 0;
		459	fd_change (EV_A_ fd);
		460	}
		461	}
		462
		463	/*****************************************************************************/
		464
		465	static void
		466	upheap (WT *heap, int k)
		467	{
		468	WT w = heap [k];
		469
151	while (k && timers [k >> 1]->at > w->at)	470	while (k && heap [k >> 1]->at > w->at)
152	{	471	{
153	timers [k] = timers [k >> 1];	472	heap [k] = heap [k >> 1];
154	timers [k]->active = k + 1;	473	((W)heap [k])->active = k + 1;
155	k >>= 1;	474	k >>= 1;
156	}	475	}
157		476
158	timers [k] = w;	477	heap [k] = w;
159	timers [k]->active = k + 1;	478	((W)heap [k])->active = k + 1;
160		479
161	}	480	}
162		481
163	static void	482	static void
164	downheap (struct ev_timer **timers, int N, int k)	483	downheap (WT *heap, int N, int k)
165	{	484	{
166	struct ev_timer *w = timers [k];	485	WT w = heap [k];
167		486
168	while (k < (N >> 1))	487	while (k < (N >> 1))
169	{	488	{
170	int j = k << 1;	489	int j = k << 1;
171		490
172	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	491	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
173	++j;	492	++j;
174		493
175	if (w->at <= timers [j]->at)	494	if (w->at <= heap [j]->at)
176	break;	495	break;
177		496
178	timers [k] = timers [j];	497	heap [k] = heap [j];
179	timers [k]->active = k + 1;	498	((W)heap [k])->active = k + 1;
180	k = j;	499	k = j;
181	}	500	}
182		501
183	timers [k] = w;	502	heap [k] = w;
184	timers [k]->active = k + 1;	503	((W)heap [k])->active = k + 1;
185	}	504	}
		505
		506	/*****************************************************************************/
186		507
187	typedef struct	508	typedef struct
188	{	509	{
189	struct ev_signal *head;	510	WL head;
190	sig_atomic_t gotsig;	511	sig_atomic_t volatile gotsig;
191	} ANSIG;	512	} ANSIG;
192		513
193	static ANSIG *signals;	514	static ANSIG *signals;
194	static int signalmax;	515	static int signalmax;
195		516
196	static int sigpipe [2];	517	static int sigpipe [2];
197	static sig_atomic_t gotsig;	518	static sig_atomic_t volatile gotsig;
198	static struct ev_io sigev;	519	static struct ev_io sigev;
199		520
200	static void	521	static void
201	signals_init (ANSIG *base, int count)	522	signals_init (ANSIG *base, int count)
202	{	523	{
203	while (count--)	524	while (count--)
204	{	525	{
205	base->head = 0;	526	base->head = 0;
206	base->gotsig = 0;	527	base->gotsig = 0;
		528
207	++base;	529	++base;
208	}	530	}
209	}	531	}
210		532
211	static void	533	static void
212	sighandler (int signum)	534	sighandler (int signum)
213	{	535	{
		536	#if WIN32
		537	signal (signum, sighandler);
		538	#endif
		539
214	signals [signum - 1].gotsig = 1;	540	signals [signum - 1].gotsig = 1;
215		541
216	if (!gotsig)	542	if (!gotsig)
217	{	543	{
		544	int old_errno = errno;
218	gotsig = 1;	545	gotsig = 1;
219	write (sigpipe [1], &gotsig, 1);	546	write (sigpipe [1], &signum, 1);
		547	errno = old_errno;
220	}	548	}
221	}	549	}
222		550
223	static void	551	static void
224	sigcb (struct ev_io *iow, int revents)	552	sigcb (EV_P_ struct ev_io *iow, int revents)
225	{	553	{
226	struct ev_signal *w;	554	WL w;
227	int sig;	555	int signum;
228		556
		557	read (sigpipe [0], &revents, 1);
229	gotsig = 0;	558	gotsig = 0;
230	read (sigpipe [0], &revents, 1);
231		559
232	for (sig = signalmax; sig--; )	560	for (signum = signalmax; signum--; )
233	if (signals [sig].gotsig)	561	if (signals [signum].gotsig)
234	{	562	{
235	signals [sig].gotsig = 0;	563	signals [signum].gotsig = 0;
236		564
237	for (w = signals [sig].head; w; w = w->next)	565	for (w = signals [signum].head; w; w = w->next)
238	event ((struct ev_watcher *)w, EV_SIGNAL);	566	event (EV_A_ (W)w, EV_SIGNAL);
239	}	567	}
240	}	568	}
241		569
242	static void	570	static void
243	siginit (void)	571	siginit (EV_P)
244	{	572	{
		573	#ifndef WIN32
245	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	574	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
246	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	575	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
247		576
248	/* rather than sort out wether we really need nb, set it */	577	/* rather than sort out wether we really need nb, set it */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	578	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	579	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		580	#endif
251		581
252	evio_set (&sigev, sigpipe [0], EV_READ);	582	ev_io_set (&sigev, sigpipe [0], EV_READ);
253	evio_start (&sigev);	583	ev_io_start (EV_A_ &sigev);
		584	ev_unref (EV_A); /* child watcher should not keep loop alive */
254	}	585	}
255		586
		587	/*****************************************************************************/
		588
		589	static struct ev_child *childs [PID_HASHSIZE];
		590
		591	#ifndef WIN32
		592
		593	static struct ev_signal childev;
		594
		595	#ifndef WCONTINUED
		596	# define WCONTINUED 0
		597	#endif
		598
		599	static void
		600	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		601	{
		602	struct ev_child *w;
		603
		604	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		605	if (w->pid == pid || !w->pid)
		606	{
		607	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		608	w->rpid = pid;
		609	w->rstatus = status;
		610	event (EV_A_ (W)w, EV_CHILD);
		611	}
		612	}
		613
		614	static void
		615	childcb (EV_P_ struct ev_signal *sw, int revents)
		616	{
		617	int pid, status;
		618
		619	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		620	{
		621	/* make sure we are called again until all childs have been reaped */
		622	event (EV_A_ (W)sw, EV_SIGNAL);
		623
		624	child_reap (EV_A_ sw, pid, pid, status);
		625	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		626	}
		627	}
		628
		629	#endif
		630
		631	/*****************************************************************************/
		632
		633	#if EV_USE_KQUEUE
		634	# include "ev_kqueue.c"
		635	#endif
256	#if HAVE_EPOLL	636	#if EV_USE_EPOLL
257	# include "ev_epoll.c"	637	# include "ev_epoll.c"
258	#endif	638	#endif
		639	#if EV_USE_POLL
		640	# include "ev_poll.c"
		641	#endif
259	#if HAVE_SELECT	642	#if EV_USE_SELECT
260	# include "ev_select.c"	643	# include "ev_select.c"
261	#endif	644	#endif
262		645
263	int ev_init (int flags)	646	int
		647	ev_version_major (void)
264	{	648	{
		649	return EV_VERSION_MAJOR;
		650	}
		651
		652	int
		653	ev_version_minor (void)
		654	{
		655	return EV_VERSION_MINOR;
		656	}
		657
		658	/* return true if we are running with elevated privileges and should ignore env variables */
		659	static int
		660	enable_secure (void)
		661	{
		662	#ifdef WIN32
		663	return 0;
		664	#else
		665	return getuid () != geteuid ()
		666	|| getgid () != getegid ();
		667	#endif
		668	}
		669
		670	int
		671	ev_method (EV_P)
		672	{
		673	return method;
		674	}
		675
		676	static void
		677	loop_init (EV_P_ int methods)
		678	{
		679	if (!method)
		680	{
265	#if HAVE_MONOTONIC	681	#if EV_USE_MONOTONIC
266	{	682	{
267	struct timespec ts;	683	struct timespec ts;
268	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	684	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269	have_monotonic = 1;	685	have_monotonic = 1;
270	}	686	}
271	#endif	687	#endif
272		688
273	ev_now = ev_time ();	689	rt_now = ev_time ();
274	now = get_clock ();	690	mn_now = get_clock ();
275	diff = ev_now - now;	691	now_floor = mn_now;
		692	rtmn_diff = rt_now - mn_now;
276		693
277	if (pipe (sigpipe))	694	if (methods == EVMETHOD_AUTO)
278	return 0;	695	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		696	methods = atoi (getenv ("LIBEV_METHODS"));
		697	else
		698	methods = EVMETHOD_ANY;
279		699
280	ev_method = EVMETHOD_NONE;	700	method = 0;
		701	#if EV_USE_WIN32
		702	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		703	#endif
		704	#if EV_USE_KQUEUE
		705	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		706	#endif
281	#if HAVE_EPOLL	707	#if EV_USE_EPOLL
282	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	708	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
283	#endif	709	#endif
		710	#if EV_USE_POLL
		711	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		712	#endif
284	#if HAVE_SELECT	713	#if EV_USE_SELECT
285	if (ev_method == EVMETHOD_NONE) select_init (flags);	714	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
286	#endif	715	#endif
287		716
288	if (ev_method)
289	{
290	evw_init (&sigev, sigcb, 0);	717	ev_watcher_init (&sigev, sigcb);
291	siginit ();	718	ev_set_priority (&sigev, EV_MAXPRI);
292	}	719	}
293
294	return ev_method;
295	}	720	}
296		721
297	void ev_prefork (void)	722	void
298	{	723	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	{	724	{
322	int i;	725	int i;
323		726
324	for (i = 0; i < fdchangecnt; ++i)	727	#if EV_USE_WIN32
		728	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		729	#endif
		730	#if EV_USE_KQUEUE
		731	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		732	#endif
		733	#if EV_USE_EPOLL
		734	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		735	#endif
		736	#if EV_USE_POLL
		737	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		738	#endif
		739	#if EV_USE_SELECT
		740	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		741	#endif
		742
		743	for (i = NUMPRI; i--; )
		744	array_free (pending, [i]);
		745
		746	/* have to use the microsoft-never-gets-it-right macro */
		747	array_free_microshit (fdchange);
		748	array_free_microshit (timer);
		749	array_free_microshit (periodic);
		750	array_free_microshit (idle);
		751	array_free_microshit (prepare);
		752	array_free_microshit (check);
		753
		754	method = 0;
		755	}
		756
		757	static void
		758	loop_fork (EV_P)
		759	{
		760	#if EV_USE_EPOLL
		761	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		762	#endif
		763	#if EV_USE_KQUEUE
		764	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		765	#endif
		766
		767	if (ev_is_active (&sigev))
		768	{
		769	/* default loop */
		770
		771	ev_ref (EV_A);
		772	ev_io_stop (EV_A_ &sigev);
		773	close (sigpipe [0]);
		774	close (sigpipe [1]);
		775
		776	while (pipe (sigpipe))
		777	syserr ("(libev) error creating pipe");
		778
		779	siginit (EV_A);
325	{	780	}
326	int fd = fdchanges [i];
327	ANFD *anfd = anfds + fd;
328	struct ev_io *w;
329		781
330	int wev = 0;	782	postfork = 0;
		783	}
331		784
332	for (w = anfd->head; w; w = w->next)	785	#if EV_MULTIPLICITY
333	wev |= w->events;	786	struct ev_loop *
		787	ev_loop_new (int methods)
		788	{
		789	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
334		790
335	if (anfd->wev != wev)	791	memset (loop, 0, sizeof (struct ev_loop));
		792
		793	loop_init (EV_A_ methods);
		794
		795	if (ev_method (EV_A))
		796	return loop;
		797
		798	return 0;
		799	}
		800
		801	void
		802	ev_loop_destroy (EV_P)
		803	{
		804	loop_destroy (EV_A);
		805	ev_free (loop);
		806	}
		807
		808	void
		809	ev_loop_fork (EV_P)
		810	{
		811	postfork = 1;
		812	}
		813
		814	#endif
		815
		816	#if EV_MULTIPLICITY
		817	struct ev_loop default_loop_struct;
		818	static struct ev_loop *default_loop;
		819
		820	struct ev_loop *
		821	#else
		822	static int default_loop;
		823
		824	int
		825	#endif
		826	ev_default_loop (int methods)
		827	{
		828	if (sigpipe [0] == sigpipe [1])
		829	if (pipe (sigpipe))
		830	return 0;
		831
		832	if (!default_loop)
		833	{
		834	#if EV_MULTIPLICITY
		835	struct ev_loop *loop = default_loop = &default_loop_struct;
		836	#else
		837	default_loop = 1;
		838	#endif
		839
		840	loop_init (EV_A_ methods);
		841
		842	if (ev_method (EV_A))
336	{	843	{
337	method_modify (fd, anfd->wev, wev);	844	siginit (EV_A);
338	anfd->wev = wev;	845
		846	#ifndef WIN32
		847	ev_signal_init (&childev, childcb, SIGCHLD);
		848	ev_set_priority (&childev, EV_MAXPRI);
		849	ev_signal_start (EV_A_ &childev);
		850	ev_unref (EV_A); /* child watcher should not keep loop alive */
		851	#endif
339	}	852	}
		853	else
		854	default_loop = 0;
340	}	855	}
341		856
342	fdchangecnt = 0;	857	return default_loop;
343	}	858	}
344		859
		860	void
		861	ev_default_destroy (void)
		862	{
		863	#if EV_MULTIPLICITY
		864	struct ev_loop *loop = default_loop;
		865	#endif
		866
		867	#ifndef WIN32
		868	ev_ref (EV_A); /* child watcher */
		869	ev_signal_stop (EV_A_ &childev);
		870	#endif
		871
		872	ev_ref (EV_A); /* signal watcher */
		873	ev_io_stop (EV_A_ &sigev);
		874
		875	close (sigpipe [0]); sigpipe [0] = 0;
		876	close (sigpipe [1]); sigpipe [1] = 0;
		877
		878	loop_destroy (EV_A);
		879	}
		880
		881	void
		882	ev_default_fork (void)
		883	{
		884	#if EV_MULTIPLICITY
		885	struct ev_loop *loop = default_loop;
		886	#endif
		887
		888	if (method)
		889	postfork = 1;
		890	}
		891
		892	/*****************************************************************************/
		893
345	static void	894	static void
346	call_pending ()	895	call_pending (EV_P)
347	{	896	{
348	int i;	897	int pri;
349		898
350	for (i = 0; i < pendingcnt; ++i)	899	for (pri = NUMPRI; pri--; )
		900	while (pendingcnt [pri])
351	{	901	{
352	ANPENDING *p = pendings + i;	902	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
353		903
354	if (p->w)	904	if (p->w)
355	{	905	{
356	p->w->pending = 0;	906	p->w->pending = 0;
357	p->w->cb (p->w, p->events);	907	p->w->cb (EV_A_ p->w, p->events);
358	}	908	}
359	}	909	}
360
361	pendingcnt = 0;
362	}	910	}
363		911
364	static void	912	static void
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	913	timers_reify (EV_P)
366	{	914	{
367	while (timercnt && timers [0]->at <= now)	915	while (timercnt && ((WT)timers [0])->at <= mn_now)
368	{	916	{
369	struct ev_timer *w = timers [0];	917	struct ev_timer *w = timers [0];
		918
		919	assert (("inactive timer on timer heap detected", ev_is_active (w)));
370		920
371	/* first reschedule or stop timer */	921	/* first reschedule or stop timer */
372	if (w->repeat)	922	if (w->repeat)
373	{	923	{
374	if (w->is_abs)	924	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;	925	((WT)w)->at = mn_now + w->repeat;
378
379	assert (w->at > now);
380
381	downheap (timers, timercnt, 0);	926	downheap ((WT *)timers, timercnt, 0);
382	}	927	}
383	else	928	else
		929	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		930
		931	event (EV_A_ (W)w, EV_TIMEOUT);
		932	}
		933	}
		934
		935	static void
		936	periodics_reify (EV_P)
		937	{
		938	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		939	{
		940	struct ev_periodic *w = periodics [0];
		941
		942	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		943
		944	/* first reschedule or stop timer */
		945	if (w->interval)
384	{	946	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	947	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
386	--timercnt; /* maybe pass by reference instead? */	948	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		949	downheap ((WT *)periodics, periodiccnt, 0);
387	}	950	}
		951	else
		952	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
388		953
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	954	event (EV_A_ (W)w, EV_PERIODIC);
390	}	955	}
391	}	956	}
392		957
393	static void	958	static void
394	time_update ()	959	periodics_reschedule (EV_P)
395	{	960	{
396	int i;	961	int i;
397	ev_now = ev_time ();
398		962
399	if (have_monotonic)	963	/* adjust periodics after time jump */
		964	for (i = 0; i < periodiccnt; ++i)
400	{	965	{
401	ev_tstamp odiff = diff;	966	struct ev_periodic *w = periodics [i];
402		967
403	/* detecting time jumps is much more difficult */	968	if (w->interval)
404	for (i = 2; --i; ) /* loop a few times, before making important decisions */
405	{	969	{
406	now = get_clock ();	970	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
407	diff = ev_now - now;
408		971
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	972	if (fabs (diff) >= 1e-4)
410	return; /* all is well */	973	{
		974	ev_periodic_stop (EV_A_ w);
		975	ev_periodic_start (EV_A_ w);
411		976
412	ev_now = ev_time ();	977	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		978	}
413	}	979	}
		980	}
		981	}
414		982
415	/* time jump detected, reschedule atimers */	983	inline int
416	for (i = 0; i < atimercnt; ++i)	984	time_update_monotonic (EV_P)
		985	{
		986	mn_now = get_clock ();
		987
		988	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		989	{
		990	rt_now = rtmn_diff + mn_now;
		991	return 0;
		992	}
		993	else
		994	{
		995	now_floor = mn_now;
		996	rt_now = ev_time ();
		997	return 1;
		998	}
		999	}
		1000
		1001	static void
		1002	time_update (EV_P)
		1003	{
		1004	int i;
		1005
		1006	#if EV_USE_MONOTONIC
		1007	if (expect_true (have_monotonic))
		1008	{
		1009	if (time_update_monotonic (EV_A))
417	{	1010	{
418	struct ev_timer *w = atimers [i];	1011	ev_tstamp odiff = rtmn_diff;
419	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1012
		1013	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1014	{
		1015	rtmn_diff = rt_now - mn_now;
		1016
		1017	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1018	return; /* all is well */
		1019
		1020	rt_now = ev_time ();
		1021	mn_now = get_clock ();
		1022	now_floor = mn_now;
		1023	}
		1024
		1025	periodics_reschedule (EV_A);
		1026	/* no timer adjustment, as the monotonic clock doesn't jump */
		1027	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
420	}	1028	}
421	}	1029	}
422	else	1030	else
		1031	#endif
423	{	1032	{
424	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1033	rt_now = ev_time ();
425	/* time jump detected, adjust rtimers */	1034
		1035	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1036	{
		1037	periodics_reschedule (EV_A);
		1038
		1039	/* adjust timers. this is easy, as the offset is the same for all */
426	for (i = 0; i < rtimercnt; ++i)	1040	for (i = 0; i < timercnt; ++i)
427	rtimers [i]->at += ev_now - now;	1041	((WT)timers [i])->at += rt_now - mn_now;
		1042	}
428		1043
429	now = ev_now;	1044	mn_now = rt_now;
430	}	1045	}
431	}	1046	}
432		1047
433	int ev_loop_done;	1048	void
		1049	ev_ref (EV_P)
		1050	{
		1051	++activecnt;
		1052	}
434		1053
		1054	void
		1055	ev_unref (EV_P)
		1056	{
		1057	--activecnt;
		1058	}
		1059
		1060	static int loop_done;
		1061
		1062	void
435	void ev_loop (int flags)	1063	ev_loop (EV_P_ int flags)
436	{	1064	{
437	double block;	1065	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	1066	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
439		1067
440	do	1068	do
441	{	1069	{
		1070	/* queue check watchers (and execute them) */
		1071	if (expect_false (preparecnt))
		1072	{
		1073	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1074	call_pending (EV_A);
		1075	}
		1076
		1077	/* we might have forked, so reify kernel state if necessary */
		1078	if (expect_false (postfork))
		1079	loop_fork (EV_A);
		1080
442	/* update fd-related kernel structures */	1081	/* update fd-related kernel structures */
443	fd_reify ();	1082	fd_reify (EV_A);
444		1083
445	/* calculate blocking time */	1084	/* calculate blocking time */
		1085
		1086	/* we only need this for !monotonic clockor timers, but as we basically
		1087	always have timers, we just calculate it always */
		1088	#if EV_USE_MONOTONIC
		1089	if (expect_true (have_monotonic))
		1090	time_update_monotonic (EV_A);
		1091	else
		1092	#endif
		1093	{
		1094	rt_now = ev_time ();
		1095	mn_now = rt_now;
		1096	}
		1097
446	if (flags & EVLOOP_NONBLOCK)	1098	if (flags & EVLOOP_NONBLOCK || idlecnt)
447	block = 0.;	1099	block = 0.;
448	else	1100	else
449	{	1101	{
450	block = MAX_BLOCKTIME;	1102	block = MAX_BLOCKTIME;
451		1103
452	if (rtimercnt)	1104	if (timercnt)
453	{	1105	{
454	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1106	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
455	if (block > to) block = to;	1107	if (block > to) block = to;
456	}	1108	}
457		1109
458	if (atimercnt)	1110	if (periodiccnt)
459	{	1111	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1112	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
461	if (block > to) block = to;	1113	if (block > to) block = to;
462	}	1114	}
463		1115
464	if (block < 0.) block = 0.;	1116	if (block < 0.) block = 0.;
465	}	1117	}
466		1118
467	method_poll (block);	1119	method_poll (EV_A_ block);
468		1120
469	/* update ev_now, do magic */	1121	/* update rt_now, do magic */
470	time_update ();	1122	time_update (EV_A);
471		1123
472	/* put pending timers into pendign queue and reschedule them */	1124	/* queue pending timers and reschedule them */
473	/* absolute timers first */	1125	timers_reify (EV_A); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	1126	periodics_reify (EV_A); /* absolute timers called first */
475	/* relative timers second */
476	timers_reify (rtimers, rtimercnt, now);
477		1127
		1128	/* queue idle watchers unless io or timers are pending */
		1129	if (!pendingcnt)
		1130	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1131
		1132	/* queue check watchers, to be executed first */
		1133	if (checkcnt)
		1134	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1135
478	call_pending ();	1136	call_pending (EV_A);
479	}	1137	}
480	while (!ev_loop_done);	1138	while (activecnt && !loop_done);
481	}
482		1139
483	static void	1140	if (loop_done != 2)
484	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1141	loop_done = 0;
		1142	}
		1143
		1144	void
		1145	ev_unloop (EV_P_ int how)
		1146	{
		1147	loop_done = how;
		1148	}
		1149
		1150	/*****************************************************************************/
		1151
		1152	inline void
		1153	wlist_add (WL *head, WL elem)
485	{	1154	{
486	elem->next = *head;	1155	elem->next = *head;
487	*head = elem;	1156	*head = elem;
488	}	1157	}
489		1158
490	static void	1159	inline void
491	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1160	wlist_del (WL *head, WL elem)
492	{	1161	{
493	while (*head)	1162	while (*head)
494	{	1163	{
495	if (*head == elem)	1164	if (*head == elem)
496	{	1165	{
…		…
500		1169
501	head = &(*head)->next;	1170	head = &(*head)->next;
502	}	1171	}
503	}	1172	}
504		1173
505	static void	1174	inline void
506	ev_start (struct ev_watcher *w, int active)	1175	ev_clear_pending (EV_P_ W w)
507	{	1176	{
		1177	if (w->pending)
		1178	{
		1179	pendings [ABSPRI (w)][w->pending - 1].w = 0;
508	w->pending = 0;	1180	w->pending = 0;
		1181	}
		1182	}
		1183
		1184	inline void
		1185	ev_start (EV_P_ W w, int active)
		1186	{
		1187	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1188	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1189
509	w->active = active;	1190	w->active = active;
		1191	ev_ref (EV_A);
510	}	1192	}
511		1193
512	static void	1194	inline void
513	ev_stop (struct ev_watcher *w)	1195	ev_stop (EV_P_ W w)
514	{	1196	{
515	if (w->pending)	1197	ev_unref (EV_A);
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	1198	w->active = 0;
519	/* nop */
520	}	1199	}
521		1200
		1201	/*****************************************************************************/
		1202
522	void	1203	void
523	evio_start (struct ev_io *w)	1204	ev_io_start (EV_P_ struct ev_io *w)
524	{	1205	{
		1206	int fd = w->fd;
		1207
525	if (ev_is_active (w))	1208	if (ev_is_active (w))
526	return;	1209	return;
527		1210
528	int fd = w->fd;	1211	assert (("ev_io_start called with negative fd", fd >= 0));
529		1212
530	ev_start ((struct ev_watcher *)w, 1);	1213	ev_start (EV_A_ (W)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1214	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1215	wlist_add ((WL *)&anfds[fd].head, (WL)w);
533		1216
534	++fdchangecnt;	1217	fd_change (EV_A_ fd);
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}	1218	}
538		1219
539	void	1220	void
540	evio_stop (struct ev_io *w)	1221	ev_io_stop (EV_P_ struct ev_io *w)
541	{	1222	{
		1223	ev_clear_pending (EV_A_ (W)w);
542	if (!ev_is_active (w))	1224	if (!ev_is_active (w))
543	return;	1225	return;
544		1226
545	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1227	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
546	ev_stop ((struct ev_watcher *)w);	1228	ev_stop (EV_A_ (W)w);
547		1229
548	++fdchangecnt;	1230	fd_change (EV_A_ w->fd);
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}	1231	}
552		1232
553	void	1233	void
554	evtimer_start (struct ev_timer *w)	1234	ev_timer_start (EV_P_ struct ev_timer *w)
555	{	1235	{
556	if (ev_is_active (w))	1236	if (ev_is_active (w))
557	return;	1237	return;
558		1238
559	if (w->is_abs)	1239	((WT)w)->at += mn_now;
		1240
		1241	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1242
		1243	ev_start (EV_A_ (W)w, ++timercnt);
		1244	array_needsize (timers, timermax, timercnt, (void));
		1245	timers [timercnt - 1] = w;
		1246	upheap ((WT *)timers, timercnt - 1);
		1247
		1248	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1249	}
		1250
		1251	void
		1252	ev_timer_stop (EV_P_ struct ev_timer *w)
		1253	{
		1254	ev_clear_pending (EV_A_ (W)w);
		1255	if (!ev_is_active (w))
		1256	return;
		1257
		1258	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1259
		1260	if (((W)w)->active < timercnt--)
		1261	{
		1262	timers [((W)w)->active - 1] = timers [timercnt];
		1263	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
560	{	1264	}
561	/* this formula differs from the one in timer_reify becuse we do not round up */	1265
		1266	((WT)w)->at = w->repeat;
		1267
		1268	ev_stop (EV_A_ (W)w);
		1269	}
		1270
		1271	void
		1272	ev_timer_again (EV_P_ struct ev_timer *w)
		1273	{
		1274	if (ev_is_active (w))
		1275	{
562	if (w->repeat)	1276	if (w->repeat)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1277	{
564		1278	((WT)w)->at = mn_now + w->repeat;
565	ev_start ((struct ev_watcher *)w, ++atimercnt);	1279	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
566	array_needsize (atimers, atimermax, atimercnt, );	1280	}
567	atimers [atimercnt - 1] = w;
568	upheap (atimers, atimercnt - 1);
569	}
570	else	1281	else
		1282	ev_timer_stop (EV_A_ w);
571	{	1283	}
572	w->at += now;	1284	else if (w->repeat)
573		1285	ev_timer_start (EV_A_ w);
574	ev_start ((struct ev_watcher *)w, ++rtimercnt);
575	array_needsize (rtimers, rtimermax, rtimercnt, );
576	rtimers [rtimercnt - 1] = w;
577	upheap (rtimers, rtimercnt - 1);
578	}
579
580	}	1286	}
581		1287
582	void	1288	void
583	evtimer_stop (struct ev_timer *w)	1289	ev_periodic_start (EV_P_ struct ev_periodic *w)
584	{	1290	{
		1291	if (ev_is_active (w))
		1292	return;
		1293
		1294	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1295
		1296	/* this formula differs from the one in periodic_reify because we do not always round up */
		1297	if (w->interval)
		1298	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1299
		1300	ev_start (EV_A_ (W)w, ++periodiccnt);
		1301	array_needsize (periodics, periodicmax, periodiccnt, (void));
		1302	periodics [periodiccnt - 1] = w;
		1303	upheap ((WT *)periodics, periodiccnt - 1);
		1304
		1305	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1306	}
		1307
		1308	void
		1309	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1310	{
		1311	ev_clear_pending (EV_A_ (W)w);
585	if (!ev_is_active (w))	1312	if (!ev_is_active (w))
586	return;	1313	return;
587		1314
588	if (w->is_abs)	1315	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
589	{	1316
590	if (w->active < atimercnt--)	1317	if (((W)w)->active < periodiccnt--)
591	{
592	atimers [w->active - 1] = atimers [atimercnt];
593	downheap (atimers, atimercnt, w->active - 1);
594	}
595	}	1318	{
596	else	1319	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1320	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
597	{	1321	}
598	if (w->active < rtimercnt--)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}
604		1322
605	ev_stop ((struct ev_watcher *)w);	1323	ev_stop (EV_A_ (W)w);
606	}	1324	}
607		1325
608	void	1326	void
609	evsignal_start (struct ev_signal *w)	1327	ev_idle_start (EV_P_ struct ev_idle *w)
610	{	1328	{
611	if (ev_is_active (w))	1329	if (ev_is_active (w))
612	return;	1330	return;
613		1331
614	ev_start ((struct ev_watcher *)w, 1);	1332	ev_start (EV_A_ (W)w, ++idlecnt);
		1333	array_needsize (idles, idlemax, idlecnt, (void));
		1334	idles [idlecnt - 1] = w;
		1335	}
		1336
		1337	void
		1338	ev_idle_stop (EV_P_ struct ev_idle *w)
		1339	{
		1340	ev_clear_pending (EV_A_ (W)w);
		1341	if (ev_is_active (w))
		1342	return;
		1343
		1344	idles [((W)w)->active - 1] = idles [--idlecnt];
		1345	ev_stop (EV_A_ (W)w);
		1346	}
		1347
		1348	void
		1349	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1350	{
		1351	if (ev_is_active (w))
		1352	return;
		1353
		1354	ev_start (EV_A_ (W)w, ++preparecnt);
		1355	array_needsize (prepares, preparemax, preparecnt, (void));
		1356	prepares [preparecnt - 1] = w;
		1357	}
		1358
		1359	void
		1360	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1361	{
		1362	ev_clear_pending (EV_A_ (W)w);
		1363	if (ev_is_active (w))
		1364	return;
		1365
		1366	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1367	ev_stop (EV_A_ (W)w);
		1368	}
		1369
		1370	void
		1371	ev_check_start (EV_P_ struct ev_check *w)
		1372	{
		1373	if (ev_is_active (w))
		1374	return;
		1375
		1376	ev_start (EV_A_ (W)w, ++checkcnt);
		1377	array_needsize (checks, checkmax, checkcnt, (void));
		1378	checks [checkcnt - 1] = w;
		1379	}
		1380
		1381	void
		1382	ev_check_stop (EV_P_ struct ev_check *w)
		1383	{
		1384	ev_clear_pending (EV_A_ (W)w);
		1385	if (ev_is_active (w))
		1386	return;
		1387
		1388	checks [((W)w)->active - 1] = checks [--checkcnt];
		1389	ev_stop (EV_A_ (W)w);
		1390	}
		1391
		1392	#ifndef SA_RESTART
		1393	# define SA_RESTART 0
		1394	#endif
		1395
		1396	void
		1397	ev_signal_start (EV_P_ struct ev_signal *w)
		1398	{
		1399	#if EV_MULTIPLICITY
		1400	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1401	#endif
		1402	if (ev_is_active (w))
		1403	return;
		1404
		1405	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1406
		1407	ev_start (EV_A_ (W)w, 1);
615	array_needsize (signals, signalmax, w->signum, signals_init);	1408	array_needsize (signals, signalmax, w->signum, signals_init);
616	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1409	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
617		1410
618	if (!w->next)	1411	if (!((WL)w)->next)
619	{	1412	{
		1413	#if WIN32
		1414	signal (w->signum, sighandler);
		1415	#else
620	struct sigaction sa;	1416	struct sigaction sa;
621	sa.sa_handler = sighandler;	1417	sa.sa_handler = sighandler;
622	sigfillset (&sa.sa_mask);	1418	sigfillset (&sa.sa_mask);
623	sa.sa_flags = 0;	1419	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
624	sigaction (w->signum, &sa, 0);	1420	sigaction (w->signum, &sa, 0);
		1421	#endif
625	}	1422	}
626	}	1423	}
627		1424
628	void	1425	void
629	evsignal_stop (struct ev_signal *w)	1426	ev_signal_stop (EV_P_ struct ev_signal *w)
630	{	1427	{
		1428	ev_clear_pending (EV_A_ (W)w);
631	if (!ev_is_active (w))	1429	if (!ev_is_active (w))
632	return;	1430	return;
633		1431
634	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1432	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
635	ev_stop ((struct ev_watcher *)w);	1433	ev_stop (EV_A_ (W)w);
636		1434
637	if (!signals [w->signum - 1].head)	1435	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	1436	signal (w->signum, SIG_DFL);
639	}	1437	}
640		1438
		1439	void
		1440	ev_child_start (EV_P_ struct ev_child *w)
		1441	{
		1442	#if EV_MULTIPLICITY
		1443	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1444	#endif
		1445	if (ev_is_active (w))
		1446	return;
		1447
		1448	ev_start (EV_A_ (W)w, 1);
		1449	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1450	}
		1451
		1452	void
		1453	ev_child_stop (EV_P_ struct ev_child *w)
		1454	{
		1455	ev_clear_pending (EV_A_ (W)w);
		1456	if (ev_is_active (w))
		1457	return;
		1458
		1459	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1460	ev_stop (EV_A_ (W)w);
		1461	}
		1462
641	/*****************************************************************************/	1463	/*****************************************************************************/
642	#if 1
643		1464
644	static void	1465	struct ev_once
645	sin_cb (struct ev_io *w, int revents)
646	{	1466	{
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;	1467	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;	1468	struct ev_timer to;
690	evw_init (&t1, ocb, 0);	1469	void (*cb)(int revents, void *arg);
691	evtimer_set_abs (&t1, 5, 10);	1470	void *arg;
692	evtimer_start (&t1);	1471	};
693		1472
694	struct ev_signal sig;	1473	static void
695	evw_init (&sig, scb, 65535);	1474	once_cb (EV_P_ struct ev_once *once, int revents)
696	evsignal_set (&sig, SIGQUIT);	1475	{
697	evsignal_start (&sig);	1476	void (*cb)(int revents, void *arg) = once->cb;
		1477	void *arg = once->arg;
698		1478
699	ev_loop (0);	1479	ev_io_stop (EV_A_ &once->io);
		1480	ev_timer_stop (EV_A_ &once->to);
		1481	ev_free (once);
700		1482
701	return 0;	1483	cb (revents, arg);
702	}	1484	}
703		1485
704	#endif	1486	static void
		1487	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1488	{
		1489	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1490	}
705		1491
		1492	static void
		1493	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1494	{
		1495	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1496	}
706		1497
		1498	void
		1499	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1500	{
		1501	struct ev_once *once = ev_malloc (sizeof (struct ev_once));
707		1502
		1503	if (!once)
		1504	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1505	else
		1506	{
		1507	once->cb = cb;
		1508	once->arg = arg;
708		1509
		1510	ev_watcher_init (&once->io, once_cb_io);
		1511	if (fd >= 0)
		1512	{
		1513	ev_io_set (&once->io, fd, events);
		1514	ev_io_start (EV_A_ &once->io);
		1515	}
		1516
		1517	ev_watcher_init (&once->to, once_cb_to);
		1518	if (timeout >= 0.)
		1519	{
		1520	ev_timer_set (&once->to, timeout, 0.);
		1521	ev_timer_start (EV_A_ &once->to);
		1522	}
		1523	}
		1524	}
		1525

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