[ViewVC] Diff of: cvs/libev/ev.c

Comparing libev/ev.c (file contents):
Revision 1.10 by root, Wed Oct 31 07:36:03 2007 UTC vs.
Revision 1.76 by root, Wed Nov 7 18:47:26 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
14	#ifndef HAVE_MONOTONIC	78	#ifndef EV_USE_MONOTONIC
15	# ifdef CLOCK_MONOTONIC
16	# define HAVE_MONOTONIC 1	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
17	# endif	105	# endif
18	#endif	106	#endif
19		107
20	#ifndef HAVE_SELECT
21	# define HAVE_SELECT 1
22	#endif
23
24	#ifndef HAVE_EPOLL
25	# define HAVE_EPOLL 0
26	#endif
27
28	#ifndef HAVE_REALTIME	108	#ifndef EV_USE_REALTIME
29	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	109	# define EV_USE_REALTIME 1
30	#endif	110	#endif
		111
		112	/**/
		113
		114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
		116	# define EV_USE_MONOTONIC 0
		117	#endif
		118
		119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
		121	# define EV_USE_REALTIME 0
		122	#endif
		123
		124	/**/
31		125
32	#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) */
33	#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 */
34		130
35	#include "ev.h"	131	#include "ev.h"
36		132
37	struct ev_watcher {	133	#if __GNUC__ >= 3
38	EV_WATCHER (ev_watcher);	134	# define expect(expr,value) __builtin_expect ((expr),(value))
39	};	135	# define inline inline
		136	#else
		137	# define expect(expr,value) (expr)
		138	# define inline static
		139	#endif
40		140
41	struct ev_watcher_list {	141	#define expect_false(expr) expect ((expr) != 0, 0)
42	EV_WATCHER_LIST (ev_watcher_list);	142	#define expect_true(expr) expect ((expr) != 0, 1)
43	};	143
		144	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		145	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
44		146
45	typedef struct ev_watcher *W;	147	typedef struct ev_watcher *W;
46	typedef struct ev_watcher_list *WL;	148	typedef struct ev_watcher_list *WL;
		149	typedef struct ev_watcher_time *WT;
47		150
48	static ev_tstamp now, diff; /* monotonic clock */	151	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
49	ev_tstamp ev_now;
50	int ev_method;
51		152
52	static int have_monotonic; /* runtime */	153	#include "ev_win32.c"
53
54	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
55	static void (*method_modify)(int fd, int oev, int nev);
56	static void (*method_poll)(ev_tstamp timeout);
57		154
58	/*****************************************************************************/	155	/*****************************************************************************/
59		156
60	ev_tstamp	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"
		224	};
		225	# undef VAR
		226	# include "ev_wrap.h"
		227
		228	#else
		229
		230	# define VAR(name,decl) static decl;
		231	# include "ev_vars.h"
		232	# undef VAR
		233
		234	#endif
		235
		236	/*****************************************************************************/
		237
		238	inline ev_tstamp
61	ev_time (void)	239	ev_time (void)
62	{	240	{
63	#if HAVE_REALTIME	241	#if EV_USE_REALTIME
64	struct timespec ts;	242	struct timespec ts;
65	clock_gettime (CLOCK_REALTIME, &ts);	243	clock_gettime (CLOCK_REALTIME, &ts);
66	return ts.tv_sec + ts.tv_nsec * 1e-9;	244	return ts.tv_sec + ts.tv_nsec * 1e-9;
67	#else	245	#else
68	struct timeval tv;	246	struct timeval tv;
69	gettimeofday (&tv, 0);	247	gettimeofday (&tv, 0);
70	return tv.tv_sec + tv.tv_usec * 1e-6;	248	return tv.tv_sec + tv.tv_usec * 1e-6;
71	#endif	249	#endif
72	}	250	}
73		251
74	static ev_tstamp	252	inline ev_tstamp
75	get_clock (void)	253	get_clock (void)
76	{	254	{
77	#if HAVE_MONOTONIC	255	#if EV_USE_MONOTONIC
78	if (have_monotonic)	256	if (expect_true (have_monotonic))
79	{	257	{
80	struct timespec ts;	258	struct timespec ts;
81	clock_gettime (CLOCK_MONOTONIC, &ts);	259	clock_gettime (CLOCK_MONOTONIC, &ts);
82	return ts.tv_sec + ts.tv_nsec * 1e-9;	260	return ts.tv_sec + ts.tv_nsec * 1e-9;
83	}	261	}
84	#endif	262	#endif
85		263
86	return ev_time ();	264	return ev_time ();
87	}	265	}
88		266
		267	ev_tstamp
		268	ev_now (EV_P)
		269	{
		270	return rt_now;
		271	}
		272
		273	#define array_roundsize(type,n) ((n) \| 4 & ~3)
		274
89	#define array_needsize(base,cur,cnt,init) \	275	#define array_needsize(type,base,cur,cnt,init) \
90	if ((cnt) > cur) \	276	if (expect_false ((cnt) > cur)) \
91	{ \	277	{ \
92	int newcnt = cur ? cur << 1 : 16; \	278	int newcnt = cur; \
93	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	279	do \
		280	{ \
		281	newcnt = array_roundsize (type, newcnt << 1); \
		282	} \
		283	while ((cnt) > newcnt); \
		284	\
94	base = realloc (base, sizeof (base) (newcnt)); \	285	base = (type )ev_realloc (base, sizeof (type) (newcnt));\
95	init (base + cur, newcnt - cur); \	286	init (base + cur, newcnt - cur); \
96	cur = newcnt; \	287	cur = newcnt; \
97	}	288	}
		289
		290	#define array_slim(type,stem) \
		291	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		292	{ \
		293	stem ## max = array_roundsize (stem ## cnt >> 1); \
		294	base = (type )ev_realloc (base, sizeof (type) (stem ## max));\
		295	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/D/\
		296	}
		297
		298	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
		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;
		302
		303	#define array_free(stem, idx) \
		304	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
98		305
99	/*****************************************************************************/	306	/*****************************************************************************/
100		307
101	typedef struct
102	{
103	struct ev_io *head;
104	unsigned char wev, rev; /* want, received event set */
105	} ANFD;
106
107	static ANFD *anfds;
108	static int anfdmax;
109
110	static int *fdchanges;
111	static int fdchangemax, fdchangecnt;
112
113	static void	308	static void
114	anfds_init (ANFD *base, int count)	309	anfds_init (ANFD *base, int count)
115	{	310	{
116	while (count--)	311	while (count--)
117	{	312	{
118	base->head = 0;	313	base->head = 0;
119	base->wev = base->rev = EV_NONE;	314	base->events = EV_NONE;
		315	base->reify = 0;
		316
120	++base;	317	++base;
121	}	318	}
122	}	319	}
123		320
124	typedef struct
125	{
126	W w;
127	int events;
128	} ANPENDING;
129
130	static ANPENDING *pendings;
131	static int pendingmax, pendingcnt;
132
133	static void	321	static void
134	event (W w, int events)	322	event (EV_P_ W w, int events)
135	{	323	{
		324	if (w->pending)
		325	{
		326	pendings [ABSPRI (w)][w->pending - 1].events \|= events;
		327	return;
		328	}
		329
136	w->pending = ++pendingcnt;	330	w->pending = ++pendingcnt [ABSPRI (w)];
137	array_needsize (pendings, pendingmax, pendingcnt, );	331	array_needsize (ANPENDING, pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], (void));
138	pendings [pendingcnt - 1].w = w;	332	pendings [ABSPRI (w)][w->pending - 1].w = w;
139	pendings [pendingcnt - 1].events = events;	333	pendings [ABSPRI (w)][w->pending - 1].events = events;
140	}	334	}
141		335
142	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
143	fd_event (int fd, int events)	346	fd_event (EV_P_ int fd, int events)
144	{	347	{
145	ANFD *anfd = anfds + fd;	348	ANFD *anfd = anfds + fd;
146	struct ev_io *w;	349	struct ev_io *w;
147		350
148	for (w = anfd->head; w; w = w->next)	351	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
149	{	352	{
150	int ev = w->events & events;	353	int ev = w->events & events;
151		354
152	if (ev)	355	if (ev)
153	event ((W)w, ev);	356	event (EV_A_ (W)w, ev);
154	}	357	}
155	}	358	}
156		359
		360	/*****************************************************************************/
		361
157	static void	362	static void
158	queue_events (W *events, int eventcnt, int type)	363	fd_reify (EV_P)
159	{	364	{
160	int i;	365	int i;
161		366
162	for (i = 0; i < eventcnt; ++i)	367	for (i = 0; i < fdchangecnt; ++i)
163	event (events [i], type);	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 (int, 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;
		445	}
		446	}
		447
		448	/* usually called after fork if method needs to re-arm all fds from scratch */
		449	static void
		450	fd_rearm_all (EV_P)
		451	{
		452	int fd;
		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	}
164	}	461	}
165		462
166	/*****************************************************************************/	463	/*****************************************************************************/
167		464
168	static struct ev_timer **atimers;
169	static int atimermax, atimercnt;
170
171	static struct ev_timer **rtimers;
172	static int rtimermax, rtimercnt;
173
174	static void	465	static void
175	upheap (struct ev_timer **timers, int k)	466	upheap (WT *heap, int k)
176	{	467	{
177	struct ev_timer *w = timers [k];	468	WT w = heap [k];
178		469
179	while (k && timers [k >> 1]->at > w->at)	470	while (k && heap [k >> 1]->at > w->at)
180	{	471	{
181	timers [k] = timers [k >> 1];	472	heap [k] = heap [k >> 1];
182	timers [k]->active = k + 1;	473	((W)heap [k])->active = k + 1;
183	k >>= 1;	474	k >>= 1;
184	}	475	}
185		476
186	timers [k] = w;	477	heap [k] = w;
187	timers [k]->active = k + 1;	478	((W)heap [k])->active = k + 1;
188		479
189	}	480	}
190		481
191	static void	482	static void
192	downheap (struct ev_timer **timers, int N, int k)	483	downheap (WT *heap, int N, int k)
193	{	484	{
194	struct ev_timer *w = timers [k];	485	WT w = heap [k];
195		486
196	while (k < (N >> 1))	487	while (k < (N >> 1))
197	{	488	{
198	int j = k << 1;	489	int j = k << 1;
199		490
200	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	491	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
201	++j;	492	++j;
202		493
203	if (w->at <= timers [j]->at)	494	if (w->at <= heap [j]->at)
204	break;	495	break;
205		496
206	timers [k] = timers [j];	497	heap [k] = heap [j];
207	timers [k]->active = k + 1;	498	((W)heap [k])->active = k + 1;
208	k = j;	499	k = j;
209	}	500	}
210		501
211	timers [k] = w;	502	heap [k] = w;
212	timers [k]->active = k + 1;	503	((W)heap [k])->active = k + 1;
213	}	504	}
214		505
215	/*****************************************************************************/	506	/*****************************************************************************/
216		507
217	typedef struct	508	typedef struct
218	{	509	{
219	struct ev_signal *head;	510	WL head;
220	sig_atomic_t gotsig;	511	sig_atomic_t volatile gotsig;
221	} ANSIG;	512	} ANSIG;
222		513
223	static ANSIG *signals;	514	static ANSIG *signals;
224	static int signalmax;	515	static int signalmax;
225		516
226	static int sigpipe [2];	517	static int sigpipe [2];
227	static sig_atomic_t gotsig;	518	static sig_atomic_t volatile gotsig;
228	static struct ev_io sigev;	519	static struct ev_io sigev;
229		520
230	static void	521	static void
231	signals_init (ANSIG *base, int count)	522	signals_init (ANSIG *base, int count)
232	{	523	{
233	while (count--)	524	while (count--)
234	{	525	{
235	base->head = 0;	526	base->head = 0;
236	base->gotsig = 0;	527	base->gotsig = 0;
		528
237	++base;	529	++base;
238	}	530	}
239	}	531	}
240		532
241	static void	533	static void
242	sighandler (int signum)	534	sighandler (int signum)
243	{	535	{
		536	#if WIN32
		537	signal (signum, sighandler);
		538	#endif
		539
244	signals [signum - 1].gotsig = 1;	540	signals [signum - 1].gotsig = 1;
245		541
246	if (!gotsig)	542	if (!gotsig)
247	{	543	{
		544	int old_errno = errno;
248	gotsig = 1;	545	gotsig = 1;
		546	#ifdef WIN32
		547	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		548	#else
249	write (sigpipe [1], &gotsig, 1);	549	write (sigpipe [1], &signum, 1);
		550	#endif
		551	errno = old_errno;
250	}	552	}
251	}	553	}
252		554
253	static void	555	static void
254	sigcb (struct ev_io *iow, int revents)	556	sigcb (EV_P_ struct ev_io *iow, int revents)
255	{	557	{
256	struct ev_signal *w;	558	WL w;
257	int sig;	559	int signum;
258		560
		561	#ifdef WIN32
		562	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		563	#else
		564	read (sigpipe [0], &revents, 1);
		565	#endif
259	gotsig = 0;	566	gotsig = 0;
260	read (sigpipe [0], &revents, 1);
261		567
262	for (sig = signalmax; sig--; )	568	for (signum = signalmax; signum--; )
263	if (signals [sig].gotsig)	569	if (signals [signum].gotsig)
264	{	570	{
265	signals [sig].gotsig = 0;	571	signals [signum].gotsig = 0;
266		572
267	for (w = signals [sig].head; w; w = w->next)	573	for (w = signals [signum].head; w; w = w->next)
268	event ((W)w, EV_SIGNAL);	574	event (EV_A_ (W)w, EV_SIGNAL);
269	}	575	}
270	}	576	}
271		577
272	static void	578	static void
273	siginit (void)	579	siginit (EV_P)
274	{	580	{
		581	#ifndef WIN32
275	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	582	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
276	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	583	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
277		584
278	/* rather than sort out wether we really need nb, set it */	585	/* rather than sort out wether we really need nb, set it */
279	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	586	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
280	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	587	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		588	#endif
281		589
282	evio_set (&sigev, sigpipe [0], EV_READ);	590	ev_io_set (&sigev, sigpipe [0], EV_READ);
283	evio_start (&sigev);	591	ev_io_start (EV_A_ &sigev);
		592	ev_unref (EV_A); /* child watcher should not keep loop alive */
284	}	593	}
285		594
286	/*****************************************************************************/	595	/*****************************************************************************/
287		596
288	static struct ev_idle **idles;	597	static struct ev_child *childs [PID_HASHSIZE];
289	static int idlemax, idlecnt;
290		598
291	static struct ev_check **checks;	599	#ifndef WIN32
292	static int checkmax, checkcnt;	600
		601	static struct ev_signal childev;
		602
		603	#ifndef WCONTINUED
		604	# define WCONTINUED 0
		605	#endif
		606
		607	static void
		608	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		609	{
		610	struct ev_child *w;
		611
		612	for (w = (struct ev_child )childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child )((WL)w)->next)
		613	if (w->pid == pid \|\| !w->pid)
		614	{
		615	ev_priority (w) = ev_priority (sw); /* need to do it now */
		616	w->rpid = pid;
		617	w->rstatus = status;
		618	event (EV_A_ (W)w, EV_CHILD);
		619	}
		620	}
		621
		622	static void
		623	childcb (EV_P_ struct ev_signal *sw, int revents)
		624	{
		625	int pid, status;
		626
		627	if (0 < (pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)))
		628	{
		629	/* make sure we are called again until all childs have been reaped */
		630	event (EV_A_ (W)sw, EV_SIGNAL);
		631
		632	child_reap (EV_A_ sw, pid, pid, status);
		633	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		634	}
		635	}
		636
		637	#endif
293		638
294	/*****************************************************************************/	639	/*****************************************************************************/
295		640
		641	#if EV_USE_KQUEUE
		642	# include "ev_kqueue.c"
		643	#endif
296	#if HAVE_EPOLL	644	#if EV_USE_EPOLL
297	# include "ev_epoll.c"	645	# include "ev_epoll.c"
298	#endif	646	#endif
		647	#if EV_USE_POLL
		648	# include "ev_poll.c"
		649	#endif
299	#if HAVE_SELECT	650	#if EV_USE_SELECT
300	# include "ev_select.c"	651	# include "ev_select.c"
301	#endif	652	#endif
302		653
303	int ev_init (int flags)	654	int
		655	ev_version_major (void)
304	{	656	{
		657	return EV_VERSION_MAJOR;
		658	}
		659
		660	int
		661	ev_version_minor (void)
		662	{
		663	return EV_VERSION_MINOR;
		664	}
		665
		666	/* return true if we are running with elevated privileges and should ignore env variables */
		667	static int
		668	enable_secure (void)
		669	{
		670	#ifdef WIN32
		671	return 0;
		672	#else
		673	return getuid () != geteuid ()
		674	\|\| getgid () != getegid ();
		675	#endif
		676	}
		677
		678	int
		679	ev_method (EV_P)
		680	{
		681	return method;
		682	}
		683
		684	static void
		685	loop_init (EV_P_ int methods)
		686	{
		687	if (!method)
		688	{
305	#if HAVE_MONOTONIC	689	#if EV_USE_MONOTONIC
306	{	690	{
307	struct timespec ts;	691	struct timespec ts;
308	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	692	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
309	have_monotonic = 1;	693	have_monotonic = 1;
310	}	694	}
311	#endif	695	#endif
312		696
313	ev_now = ev_time ();	697	rt_now = ev_time ();
314	now = get_clock ();	698	mn_now = get_clock ();
315	diff = ev_now - now;	699	now_floor = mn_now;
		700	rtmn_diff = rt_now - mn_now;
316		701
		702	if (methods == EVMETHOD_AUTO)
		703	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		704	methods = atoi (getenv ("LIBEV_METHODS"));
		705	else
		706	methods = EVMETHOD_ANY;
		707
		708	method = 0;
		709	#if EV_USE_WIN32
		710	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		711	#endif
		712	#if EV_USE_KQUEUE
		713	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		714	#endif
		715	#if EV_USE_EPOLL
		716	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		717	#endif
		718	#if EV_USE_POLL
		719	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		720	#endif
		721	#if EV_USE_SELECT
		722	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		723	#endif
		724
		725	ev_watcher_init (&sigev, sigcb);
		726	ev_set_priority (&sigev, EV_MAXPRI);
		727	}
		728	}
		729
		730	void
		731	loop_destroy (EV_P)
		732	{
		733	int i;
		734
		735	#if EV_USE_WIN32
		736	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		737	#endif
		738	#if EV_USE_KQUEUE
		739	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		740	#endif
		741	#if EV_USE_EPOLL
		742	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		743	#endif
		744	#if EV_USE_POLL
		745	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		746	#endif
		747	#if EV_USE_SELECT
		748	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		749	#endif
		750
		751	for (i = NUMPRI; i--; )
		752	array_free (pending, [i]);
		753
		754	/* have to use the microsoft-never-gets-it-right macro */
		755	array_free_microshit (fdchange);
		756	array_free_microshit (timer);
		757	array_free_microshit (periodic);
		758	array_free_microshit (idle);
		759	array_free_microshit (prepare);
		760	array_free_microshit (check);
		761
		762	method = 0;
		763	}
		764
		765	static void
		766	loop_fork (EV_P)
		767	{
		768	#if EV_USE_EPOLL
		769	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		770	#endif
		771	#if EV_USE_KQUEUE
		772	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		773	#endif
		774
		775	if (ev_is_active (&sigev))
		776	{
		777	/* default loop */
		778
		779	ev_ref (EV_A);
		780	ev_io_stop (EV_A_ &sigev);
		781	close (sigpipe [0]);
		782	close (sigpipe [1]);
		783
		784	while (pipe (sigpipe))
		785	syserr ("(libev) error creating pipe");
		786
		787	siginit (EV_A);
		788	}
		789
		790	postfork = 0;
		791	}
		792
		793	#if EV_MULTIPLICITY
		794	struct ev_loop *
		795	ev_loop_new (int methods)
		796	{
		797	struct ev_loop loop = (struct ev_loop )ev_malloc (sizeof (struct ev_loop));
		798
		799	memset (loop, 0, sizeof (struct ev_loop));
		800
		801	loop_init (EV_A_ methods);
		802
		803	if (ev_method (EV_A))
		804	return loop;
		805
		806	return 0;
		807	}
		808
		809	void
		810	ev_loop_destroy (EV_P)
		811	{
		812	loop_destroy (EV_A);
		813	ev_free (loop);
		814	}
		815
		816	void
		817	ev_loop_fork (EV_P)
		818	{
		819	postfork = 1;
		820	}
		821
		822	#endif
		823
		824	#if EV_MULTIPLICITY
		825	struct ev_loop default_loop_struct;
		826	static struct ev_loop *default_loop;
		827
		828	struct ev_loop *
		829	#else
		830	static int default_loop;
		831
		832	int
		833	#endif
		834	ev_default_loop (int methods)
		835	{
		836	if (sigpipe [0] == sigpipe [1])
317	if (pipe (sigpipe))	837	if (pipe (sigpipe))
318	return 0;	838	return 0;
319		839
320	ev_method = EVMETHOD_NONE;	840	if (!default_loop)
321	#if HAVE_EPOLL	841	{
322	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	842	#if EV_MULTIPLICITY
		843	struct ev_loop *loop = default_loop = &default_loop_struct;
		844	#else
		845	default_loop = 1;
323	#endif	846	#endif
324	#if HAVE_SELECT
325	if (ev_method == EVMETHOD_NONE) select_init (flags);
326	#endif
327		847
		848	loop_init (EV_A_ methods);
		849
		850	if (ev_method (EV_A))
		851	{
		852	siginit (EV_A);
		853
		854	#ifndef WIN32
		855	ev_signal_init (&childev, childcb, SIGCHLD);
		856	ev_set_priority (&childev, EV_MAXPRI);
		857	ev_signal_start (EV_A_ &childev);
		858	ev_unref (EV_A); /* child watcher should not keep loop alive */
		859	#endif
		860	}
		861	else
		862	default_loop = 0;
		863	}
		864
		865	return default_loop;
		866	}
		867
		868	void
		869	ev_default_destroy (void)
		870	{
		871	#if EV_MULTIPLICITY
		872	struct ev_loop *loop = default_loop;
		873	#endif
		874
		875	#ifndef WIN32
		876	ev_ref (EV_A); /* child watcher */
		877	ev_signal_stop (EV_A_ &childev);
		878	#endif
		879
		880	ev_ref (EV_A); /* signal watcher */
		881	ev_io_stop (EV_A_ &sigev);
		882
		883	close (sigpipe [0]); sigpipe [0] = 0;
		884	close (sigpipe [1]); sigpipe [1] = 0;
		885
		886	loop_destroy (EV_A);
		887	}
		888
		889	void
		890	ev_default_fork (void)
		891	{
		892	#if EV_MULTIPLICITY
		893	struct ev_loop *loop = default_loop;
		894	#endif
		895
328	if (ev_method)	896	if (method)
329	{	897	postfork = 1;
330	evw_init (&sigev, sigcb, 0);
331	siginit ();
332	}
333
334	return ev_method;
335	}	898	}
336		899
337	/*****************************************************************************/	900	/*****************************************************************************/
338		901
339	void ev_prefork (void)
340	{
341	}
342
343	void ev_postfork_parent (void)
344	{
345	}
346
347	void ev_postfork_child (void)
348	{
349	#if HAVE_EPOLL
350	if (ev_method == EVMETHOD_EPOLL)
351	epoll_postfork_child ();
352	#endif
353
354	evio_stop (&sigev);
355	close (sigpipe [0]);
356	close (sigpipe [1]);
357	pipe (sigpipe);
358	siginit ();
359	}
360
361	/*****************************************************************************/
362
363	static void	902	static int
364	fd_reify (void)	903	any_pending (EV_P)
365	{	904	{
366	int i;	905	int pri;
367		906
368	for (i = 0; i < fdchangecnt; ++i)	907	for (pri = NUMPRI; pri--; )
369	{	908	if (pendingcnt [pri])
370	int fd = fdchanges [i];	909	return 1;
371	ANFD *anfd = anfds + fd;
372	struct ev_io *w;
373		910
374	int wev = 0;	911	return 0;
375
376	for (w = anfd->head; w; w = w->next)
377	wev \|= w->events;
378
379	if (anfd->wev != wev)
380	{
381	method_modify (fd, anfd->wev, wev);
382	anfd->wev = wev;
383	}
384	}
385
386	fdchangecnt = 0;
387	}	912	}
388		913
389	static void	914	static void
390	call_pending ()	915	call_pending (EV_P)
391	{	916	{
392	int i;	917	int pri;
393		918
394	for (i = 0; i < pendingcnt; ++i)	919	for (pri = NUMPRI; pri--; )
		920	while (pendingcnt [pri])
395	{	921	{
396	ANPENDING *p = pendings + i;	922	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
397		923
398	if (p->w)	924	if (p->w)
399	{	925	{
400	p->w->pending = 0;	926	p->w->pending = 0;
401	p->w->cb (p->w, p->events);	927	p->w->cb (EV_A_ p->w, p->events);
402	}	928	}
403	}	929	}
404
405	pendingcnt = 0;
406	}	930	}
407		931
408	static void	932	static void
409	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	933	timers_reify (EV_P)
410	{	934	{
411	while (timercnt && timers [0]->at <= now)	935	while (timercnt && ((WT)timers [0])->at <= mn_now)
412	{	936	{
413	struct ev_timer *w = timers [0];	937	struct ev_timer *w = timers [0];
		938
		939	assert (("inactive timer on timer heap detected", ev_is_active (w)));
414		940
415	/* first reschedule or stop timer */	941	/* first reschedule or stop timer */
416	if (w->repeat)	942	if (w->repeat)
417	{	943	{
418	if (w->is_abs)	944	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
419	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
420	else
421	w->at = now + w->repeat;	945	((WT)w)->at = mn_now + w->repeat;
422
423	assert (w->at > now);
424
425	downheap (timers, timercnt, 0);	946	downheap ((WT *)timers, timercnt, 0);
426	}	947	}
427	else	948	else
		949	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		950
		951	event (EV_A_ (W)w, EV_TIMEOUT);
		952	}
		953	}
		954
		955	static void
		956	periodics_reify (EV_P)
		957	{
		958	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		959	{
		960	struct ev_periodic *w = periodics [0];
		961
		962	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		963
		964	/* first reschedule or stop timer */
		965	if (w->interval)
428	{	966	{
429	evtimer_stop (w); /* nonrepeating: stop timer */	967	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
430	--timercnt; /* maybe pass by reference instead? */	968	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		969	downheap ((WT *)periodics, periodiccnt, 0);
431	}	970	}
		971	else
		972	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
432		973
433	event ((W)w, EV_TIMEOUT);	974	event (EV_A_ (W)w, EV_PERIODIC);
434	}	975	}
435	}	976	}
436		977
437	static void	978	static void
438	time_update ()	979	periodics_reschedule (EV_P)
439	{	980	{
440	int i;	981	int i;
441	ev_now = ev_time ();
442		982
443	if (have_monotonic)	983	/* adjust periodics after time jump */
		984	for (i = 0; i < periodiccnt; ++i)
444	{	985	{
445	ev_tstamp odiff = diff;	986	struct ev_periodic *w = periodics [i];
446		987
447	/* detecting time jumps is much more difficult */	988	if (w->interval)
448	for (i = 2; --i; ) /* loop a few times, before making important decisions */
449	{	989	{
450	now = get_clock ();	990	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
451	diff = ev_now - now;
452		991
453	if (fabs (odiff - diff) < MIN_TIMEJUMP)	992	if (fabs (diff) >= 1e-4)
454	return; /* all is well */	993	{
		994	ev_periodic_stop (EV_A_ w);
		995	ev_periodic_start (EV_A_ w);
455		996
456	ev_now = ev_time ();	997	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		998	}
457	}	999	}
		1000	}
		1001	}
458		1002
459	/* time jump detected, reschedule atimers */	1003	inline int
460	for (i = 0; i < atimercnt; ++i)	1004	time_update_monotonic (EV_P)
		1005	{
		1006	mn_now = get_clock ();
		1007
		1008	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1009	{
		1010	rt_now = rtmn_diff + mn_now;
		1011	return 0;
		1012	}
		1013	else
		1014	{
		1015	now_floor = mn_now;
		1016	rt_now = ev_time ();
		1017	return 1;
		1018	}
		1019	}
		1020
		1021	static void
		1022	time_update (EV_P)
		1023	{
		1024	int i;
		1025
		1026	#if EV_USE_MONOTONIC
		1027	if (expect_true (have_monotonic))
		1028	{
		1029	if (time_update_monotonic (EV_A))
461	{	1030	{
462	struct ev_timer *w = atimers [i];	1031	ev_tstamp odiff = rtmn_diff;
463	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1032
		1033	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1034	{
		1035	rtmn_diff = rt_now - mn_now;
		1036
		1037	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1038	return; /* all is well */
		1039
		1040	rt_now = ev_time ();
		1041	mn_now = get_clock ();
		1042	now_floor = mn_now;
		1043	}
		1044
		1045	periodics_reschedule (EV_A);
		1046	/* no timer adjustment, as the monotonic clock doesn't jump */
		1047	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
464	}	1048	}
465	}	1049	}
466	else	1050	else
		1051	#endif
467	{	1052	{
468	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1053	rt_now = ev_time ();
469	/* time jump detected, adjust rtimers */	1054
		1055	if (expect_false (mn_now > rt_now \|\| mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1056	{
		1057	periodics_reschedule (EV_A);
		1058
		1059	/* adjust timers. this is easy, as the offset is the same for all */
470	for (i = 0; i < rtimercnt; ++i)	1060	for (i = 0; i < timercnt; ++i)
471	rtimers [i]->at += ev_now - now;	1061	((WT)timers [i])->at += rt_now - mn_now;
		1062	}
472		1063
473	now = ev_now;	1064	mn_now = rt_now;
474	}	1065	}
475	}	1066	}
476		1067
477	int ev_loop_done;	1068	void
		1069	ev_ref (EV_P)
		1070	{
		1071	++activecnt;
		1072	}
478		1073
		1074	void
		1075	ev_unref (EV_P)
		1076	{
		1077	--activecnt;
		1078	}
		1079
		1080	static int loop_done;
		1081
		1082	void
479	void ev_loop (int flags)	1083	ev_loop (EV_P_ int flags)
480	{	1084	{
481	double block;	1085	double block;
482	ev_loop_done = flags & EVLOOP_ONESHOT;	1086	loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
483
484	if (checkcnt)
485	{
486	queue_events ((W *)checks, checkcnt, EV_CHECK);
487	call_pending ();
488	}
489		1087
490	do	1088	do
491	{	1089	{
		1090	/* queue check watchers (and execute them) */
		1091	if (expect_false (preparecnt))
		1092	{
		1093	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1094	call_pending (EV_A);
		1095	}
		1096
		1097	/* we might have forked, so reify kernel state if necessary */
		1098	if (expect_false (postfork))
		1099	loop_fork (EV_A);
		1100
492	/* update fd-related kernel structures */	1101	/* update fd-related kernel structures */
493	fd_reify ();	1102	fd_reify (EV_A);
494		1103
495	/* calculate blocking time */	1104	/* calculate blocking time */
		1105
		1106	/* we only need this for !monotonic clock or timers, but as we basically
		1107	always have timers, we just calculate it always */
		1108	#if EV_USE_MONOTONIC
		1109	if (expect_true (have_monotonic))
		1110	time_update_monotonic (EV_A);
		1111	else
		1112	#endif
		1113	{
		1114	rt_now = ev_time ();
		1115	mn_now = rt_now;
		1116	}
		1117
496	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)	1118	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
497	block = 0.;	1119	block = 0.;
498	else	1120	else
499	{	1121	{
500	block = MAX_BLOCKTIME;	1122	block = MAX_BLOCKTIME;
501		1123
502	if (rtimercnt)	1124	if (timercnt)
503	{	1125	{
504	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1126	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
505	if (block > to) block = to;	1127	if (block > to) block = to;
506	}	1128	}
507		1129
508	if (atimercnt)	1130	if (periodiccnt)
509	{	1131	{
510	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1132	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
511	if (block > to) block = to;	1133	if (block > to) block = to;
512	}	1134	}
513		1135
514	if (block < 0.) block = 0.;	1136	if (block < 0.) block = 0.;
515	}	1137	}
516		1138
517	method_poll (block);	1139	method_poll (EV_A_ block);
518		1140
519	/* update ev_now, do magic */	1141	/* update rt_now, do magic */
520	time_update ();	1142	time_update (EV_A);
521		1143
522	/* queue pending timers and reschedule them */	1144	/* queue pending timers and reschedule them */
523	/* absolute timers first */	1145	timers_reify (EV_A); /* relative timers called last */
524	timers_reify (atimers, atimercnt, ev_now);	1146	periodics_reify (EV_A); /* absolute timers called first */
525	/* relative timers second */
526	timers_reify (rtimers, rtimercnt, now);
527		1147
528	/* queue idle watchers unless io or timers are pending */	1148	/* queue idle watchers unless io or timers are pending */
529	if (!pendingcnt)	1149	if (idlecnt && !any_pending (EV_A))
530	queue_events ((W *)idles, idlecnt, EV_IDLE);	1150	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
531		1151
532	/* queue check and possibly idle watchers */	1152	/* queue check watchers, to be executed first */
		1153	if (checkcnt)
533	queue_events ((W *)checks, checkcnt, EV_CHECK);	1154	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
534		1155
535	call_pending ();	1156	call_pending (EV_A);
536	}	1157	}
537	while (!ev_loop_done);	1158	while (activecnt && !loop_done);
		1159
		1160	if (loop_done != 2)
		1161	loop_done = 0;
		1162	}
		1163
		1164	void
		1165	ev_unloop (EV_P_ int how)
		1166	{
		1167	loop_done = how;
538	}	1168	}
539		1169
540	/*****************************************************************************/	1170	/*****************************************************************************/
541		1171
542	static void	1172	inline void
543	wlist_add (WL *head, WL elem)	1173	wlist_add (WL *head, WL elem)
544	{	1174	{
545	elem->next = *head;	1175	elem->next = *head;
546	*head = elem;	1176	*head = elem;
547	}	1177	}
548		1178
549	static void	1179	inline void
550	wlist_del (WL *head, WL elem)	1180	wlist_del (WL *head, WL elem)
551	{	1181	{
552	while (*head)	1182	while (*head)
553	{	1183	{
554	if (*head == elem)	1184	if (*head == elem)
559		1189
560	head = &(*head)->next;	1190	head = &(*head)->next;
561	}	1191	}
562	}	1192	}
563		1193
564	static void	1194	inline void
		1195	ev_clear_pending (EV_P_ W w)
		1196	{
		1197	if (w->pending)
		1198	{
		1199	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1200	w->pending = 0;
		1201	}
		1202	}
		1203
		1204	inline void
565	ev_start (W w, int active)	1205	ev_start (EV_P_ W w, int active)
566	{	1206	{
567	w->pending = 0;	1207	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1208	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1209
568	w->active = active;	1210	w->active = active;
		1211	ev_ref (EV_A);
569	}	1212	}
570		1213
571	static void	1214	inline void
572	ev_stop (W w)	1215	ev_stop (EV_P_ W w)
573	{	1216	{
574	if (w->pending)	1217	ev_unref (EV_A);
575	pendings [w->pending - 1].w = 0;
576
577	w->active = 0;	1218	w->active = 0;
578	/* nop */
579	}	1219	}
580		1220
581	/*****************************************************************************/	1221	/*****************************************************************************/
582		1222
583	void	1223	void
584	evio_start (struct ev_io *w)	1224	ev_io_start (EV_P_ struct ev_io *w)
585	{	1225	{
		1226	int fd = w->fd;
		1227
586	if (ev_is_active (w))	1228	if (ev_is_active (w))
587	return;	1229	return;
588		1230
589	int fd = w->fd;	1231	assert (("ev_io_start called with negative fd", fd >= 0));
590		1232
591	ev_start ((W)w, 1);	1233	ev_start (EV_A_ (W)w, 1);
592	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1234	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
593	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1235	wlist_add ((WL *)&anfds[fd].head, (WL)w);
594		1236
595	++fdchangecnt;	1237	fd_change (EV_A_ fd);
596	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
597	fdchanges [fdchangecnt - 1] = fd;
598	}	1238	}
599		1239
600	void	1240	void
601	evio_stop (struct ev_io *w)	1241	ev_io_stop (EV_P_ struct ev_io *w)
602	{	1242	{
		1243	ev_clear_pending (EV_A_ (W)w);
603	if (!ev_is_active (w))	1244	if (!ev_is_active (w))
604	return;	1245	return;
605		1246
606	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1247	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
607	ev_stop ((W)w);	1248	ev_stop (EV_A_ (W)w);
608		1249
609	++fdchangecnt;	1250	fd_change (EV_A_ w->fd);
610	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
611	fdchanges [fdchangecnt - 1] = w->fd;
612	}	1251	}
613		1252
614	void	1253	void
615	evtimer_start (struct ev_timer *w)	1254	ev_timer_start (EV_P_ struct ev_timer *w)
616	{	1255	{
617	if (ev_is_active (w))	1256	if (ev_is_active (w))
618	return;	1257	return;
619		1258
620	if (w->is_abs)	1259	((WT)w)->at += mn_now;
		1260
		1261	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1262
		1263	ev_start (EV_A_ (W)w, ++timercnt);
		1264	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
		1265	timers [timercnt - 1] = w;
		1266	upheap ((WT *)timers, timercnt - 1);
		1267
		1268	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1269	}
		1270
		1271	void
		1272	ev_timer_stop (EV_P_ struct ev_timer *w)
		1273	{
		1274	ev_clear_pending (EV_A_ (W)w);
		1275	if (!ev_is_active (w))
		1276	return;
		1277
		1278	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1279
		1280	if (((W)w)->active < timercnt--)
		1281	{
		1282	timers [((W)w)->active - 1] = timers [timercnt];
		1283	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
621	{	1284	}
622	/* this formula differs from the one in timer_reify becuse we do not round up */	1285
		1286	((WT)w)->at = w->repeat;
		1287
		1288	ev_stop (EV_A_ (W)w);
		1289	}
		1290
		1291	void
		1292	ev_timer_again (EV_P_ struct ev_timer *w)
		1293	{
		1294	if (ev_is_active (w))
		1295	{
623	if (w->repeat)	1296	if (w->repeat)
624	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1297	{
625		1298	((WT)w)->at = mn_now + w->repeat;
626	ev_start ((W)w, ++atimercnt);	1299	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
627	array_needsize (atimers, atimermax, atimercnt, );	1300	}
628	atimers [atimercnt - 1] = w;
629	upheap (atimers, atimercnt - 1);
630	}
631	else	1301	else
		1302	ev_timer_stop (EV_A_ w);
632	{	1303	}
633	w->at += now;	1304	else if (w->repeat)
634		1305	ev_timer_start (EV_A_ w);
635	ev_start ((W)w, ++rtimercnt);
636	array_needsize (rtimers, rtimermax, rtimercnt, );
637	rtimers [rtimercnt - 1] = w;
638	upheap (rtimers, rtimercnt - 1);
639	}
640
641	}	1306	}
642		1307
643	void	1308	void
644	evtimer_stop (struct ev_timer *w)	1309	ev_periodic_start (EV_P_ struct ev_periodic *w)
645	{	1310	{
		1311	if (ev_is_active (w))
		1312	return;
		1313
		1314	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1315
		1316	/* this formula differs from the one in periodic_reify because we do not always round up */
		1317	if (w->interval)
		1318	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1319
		1320	ev_start (EV_A_ (W)w, ++periodiccnt);
		1321	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
		1322	periodics [periodiccnt - 1] = w;
		1323	upheap ((WT *)periodics, periodiccnt - 1);
		1324
		1325	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1326	}
		1327
		1328	void
		1329	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1330	{
		1331	ev_clear_pending (EV_A_ (W)w);
646	if (!ev_is_active (w))	1332	if (!ev_is_active (w))
647	return;	1333	return;
648		1334
649	if (w->is_abs)	1335	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
650	{	1336
651	if (w->active < atimercnt--)	1337	if (((W)w)->active < periodiccnt--)
652	{
653	atimers [w->active - 1] = atimers [atimercnt];
654	downheap (atimers, atimercnt, w->active - 1);
655	}
656	}	1338	{
657	else	1339	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1340	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
658	{	1341	}
659	if (w->active < rtimercnt--)
660	{
661	rtimers [w->active - 1] = rtimers [rtimercnt];
662	downheap (rtimers, rtimercnt, w->active - 1);
663	}
664	}
665		1342
666	ev_stop ((W)w);	1343	ev_stop (EV_A_ (W)w);
667	}	1344	}
668		1345
669	void	1346	void
670	evsignal_start (struct ev_signal *w)	1347	ev_idle_start (EV_P_ struct ev_idle *w)
671	{	1348	{
672	if (ev_is_active (w))	1349	if (ev_is_active (w))
673	return;	1350	return;
674		1351
		1352	ev_start (EV_A_ (W)w, ++idlecnt);
		1353	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1354	idles [idlecnt - 1] = w;
		1355	}
		1356
		1357	void
		1358	ev_idle_stop (EV_P_ struct ev_idle *w)
		1359	{
		1360	ev_clear_pending (EV_A_ (W)w);
		1361	if (ev_is_active (w))
		1362	return;
		1363
		1364	idles [((W)w)->active - 1] = idles [--idlecnt];
		1365	ev_stop (EV_A_ (W)w);
		1366	}
		1367
		1368	void
		1369	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1370	{
		1371	if (ev_is_active (w))
		1372	return;
		1373
		1374	ev_start (EV_A_ (W)w, ++preparecnt);
		1375	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1376	prepares [preparecnt - 1] = w;
		1377	}
		1378
		1379	void
		1380	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1381	{
		1382	ev_clear_pending (EV_A_ (W)w);
		1383	if (ev_is_active (w))
		1384	return;
		1385
		1386	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1387	ev_stop (EV_A_ (W)w);
		1388	}
		1389
		1390	void
		1391	ev_check_start (EV_P_ struct ev_check *w)
		1392	{
		1393	if (ev_is_active (w))
		1394	return;
		1395
		1396	ev_start (EV_A_ (W)w, ++checkcnt);
		1397	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1398	checks [checkcnt - 1] = w;
		1399	}
		1400
		1401	void
		1402	ev_check_stop (EV_P_ struct ev_check *w)
		1403	{
		1404	ev_clear_pending (EV_A_ (W)w);
		1405	if (ev_is_active (w))
		1406	return;
		1407
		1408	checks [((W)w)->active - 1] = checks [--checkcnt];
		1409	ev_stop (EV_A_ (W)w);
		1410	}
		1411
		1412	#ifndef SA_RESTART
		1413	# define SA_RESTART 0
		1414	#endif
		1415
		1416	void
		1417	ev_signal_start (EV_P_ struct ev_signal *w)
		1418	{
		1419	#if EV_MULTIPLICITY
		1420	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1421	#endif
		1422	if (ev_is_active (w))
		1423	return;
		1424
		1425	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1426
675	ev_start ((W)w, 1);	1427	ev_start (EV_A_ (W)w, 1);
676	array_needsize (signals, signalmax, w->signum, signals_init);	1428	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
677	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1429	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
678		1430
679	if (!w->next)	1431	if (!((WL)w)->next)
680	{	1432	{
		1433	#if WIN32
		1434	signal (w->signum, sighandler);
		1435	#else
681	struct sigaction sa;	1436	struct sigaction sa;
682	sa.sa_handler = sighandler;	1437	sa.sa_handler = sighandler;
683	sigfillset (&sa.sa_mask);	1438	sigfillset (&sa.sa_mask);
684	sa.sa_flags = 0;	1439	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
685	sigaction (w->signum, &sa, 0);	1440	sigaction (w->signum, &sa, 0);
		1441	#endif
686	}	1442	}
687	}	1443	}
688		1444
689	void	1445	void
690	evsignal_stop (struct ev_signal *w)	1446	ev_signal_stop (EV_P_ struct ev_signal *w)
691	{	1447	{
		1448	ev_clear_pending (EV_A_ (W)w);
692	if (!ev_is_active (w))	1449	if (!ev_is_active (w))
693	return;	1450	return;
694		1451
695	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1452	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
696	ev_stop ((W)w);	1453	ev_stop (EV_A_ (W)w);
697		1454
698	if (!signals [w->signum - 1].head)	1455	if (!signals [w->signum - 1].head)
699	signal (w->signum, SIG_DFL);	1456	signal (w->signum, SIG_DFL);
700	}	1457	}
701		1458
702	void evidle_start (struct ev_idle *w)	1459	void
		1460	ev_child_start (EV_P_ struct ev_child *w)
703	{	1461	{
		1462	#if EV_MULTIPLICITY
		1463	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1464	#endif
704	if (ev_is_active (w))	1465	if (ev_is_active (w))
705	return;	1466	return;
706		1467
707	ev_start ((W)w, ++idlecnt);	1468	ev_start (EV_A_ (W)w, 1);
708	array_needsize (idles, idlemax, idlecnt, );	1469	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
709	idles [idlecnt - 1] = w;
710	}	1470	}
711		1471
712	void evidle_stop (struct ev_idle *w)	1472	void
		1473	ev_child_stop (EV_P_ struct ev_child *w)
713	{	1474	{
714	idles [w->active - 1] = idles [--idlecnt];	1475	ev_clear_pending (EV_A_ (W)w);
715	ev_stop ((W)w);
716	}
717
718	void evcheck_start (struct ev_check *w)
719	{
720	if (ev_is_active (w))	1476	if (ev_is_active (w))
721	return;	1477	return;
722		1478
723	ev_start ((W)w, ++checkcnt);	1479	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
724	array_needsize (checks, checkmax, checkcnt, );
725	checks [checkcnt - 1] = w;
726	}
727
728	void evcheck_stop (struct ev_check *w)
729	{
730	checks [w->active - 1] = checks [--checkcnt];
731	ev_stop ((W)w);	1480	ev_stop (EV_A_ (W)w);
732	}	1481	}
733		1482
734	/*****************************************************************************/	1483	/*****************************************************************************/
735		1484
736	#if 0	1485	struct ev_once
737
738	static void
739	sin_cb (struct ev_io *w, int revents)
740	{	1486	{
741	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
742	}
743
744	static void
745	ocb (struct ev_timer *w, int revents)
746	{
747	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
748	evtimer_stop (w);
749	evtimer_start (w);
750	}
751
752	static void
753	scb (struct ev_signal *w, int revents)
754	{
755	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
756	}
757
758	static void
759	gcb (struct ev_signal *w, int revents)
760	{
761	fprintf (stderr, "generic %x\n", revents);
762	}
763
764	int main (void)
765	{
766	struct ev_io sin;	1487	struct ev_io io;
767
768	ev_init (0);
769
770	evw_init (&sin, sin_cb, 55);
771	evio_set (&sin, 0, EV_READ);
772	evio_start (&sin);
773
774	struct ev_timer t[10000];
775
776	#if 0
777	int i;
778	for (i = 0; i < 10000; ++i)
779	{
780	struct ev_timer *w = t + i;
781	evw_init (w, ocb, i);
782	evtimer_set_abs (w, drand48 (), 0.99775533);
783	evtimer_start (w);
784	if (drand48 () < 0.5)
785	evtimer_stop (w);
786	}
787	#endif
788
789	struct ev_timer t1;	1488	struct ev_timer to;
790	evw_init (&t1, ocb, 0);	1489	void (cb)(int revents, void arg);
791	evtimer_set_abs (&t1, 5, 10);	1490	void *arg;
792	evtimer_start (&t1);	1491	};
793		1492
794	struct ev_signal sig;	1493	static void
795	evw_init (&sig, scb, 65535);	1494	once_cb (EV_P_ struct ev_once *once, int revents)
796	evsignal_set (&sig, SIGQUIT);	1495	{
797	evsignal_start (&sig);	1496	void (cb)(int revents, void arg) = once->cb;
		1497	void *arg = once->arg;
798		1498
799	struct ev_check cw;	1499	ev_io_stop (EV_A_ &once->io);
800	evw_init (&cw, gcb, 0);	1500	ev_timer_stop (EV_A_ &once->to);
801	evcheck_start (&cw);	1501	ev_free (once);
802		1502
803	struct ev_idle iw;	1503	cb (revents, arg);
804	evw_init (&iw, gcb, 0);
805	evidle_start (&iw);
806
807	ev_loop (0);
808
809	return 0;
810	}	1504	}
811		1505
812	#endif	1506	static void
		1507	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1508	{
		1509	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1510	}
813		1511
		1512	static void
		1513	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1514	{
		1515	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1516	}
814		1517
		1518	void
		1519	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1520	{
		1521	struct ev_once once = (struct ev_once )ev_malloc (sizeof (struct ev_once));
815		1522
		1523	if (!once)
		1524	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1525	else
		1526	{
		1527	once->cb = cb;
		1528	once->arg = arg;
816		1529
		1530	ev_watcher_init (&once->io, once_cb_io);
		1531	if (fd >= 0)
		1532	{
		1533	ev_io_set (&once->io, fd, events);
		1534	ev_io_start (EV_A_ &once->io);
		1535	}
		1536
		1537	ev_watcher_init (&once->to, once_cb_to);
		1538	if (timeout >= 0.)
		1539	{
		1540	ev_timer_set (&once->to, timeout, 0.);
		1541	ev_timer_start (EV_A_ &once->to);
		1542	}
		1543	}
		1544	}
		1545

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Comparing libev/ev.c (file contents): Revision 1.10 by root, Wed Oct 31 07:36:03 2007 UTC vs. Revision 1.76 by root, Wed Nov 7 18:47:26 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.10 by root, Wed Oct 31 07:36:03 2007 UTC vs.
Revision 1.76 by root, Wed Nov 7 18:47:26 2007 UTC