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

Comparing libev/ev.c (file contents):
Revision 1.13 by root, Wed Oct 31 10:50:05 2007 UTC vs.
Revision 1.78 by root, Thu Nov 8 21:08:56 2007 UTC

…		…
		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#ifndef EV_STANDALONE
		32	# include "config.h"
		33
		34	# if HAVE_CLOCK_GETTIME
		35	# define EV_USE_MONOTONIC 1
		36	# define EV_USE_REALTIME 1
		37	# endif
		38
		39	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		40	# define EV_USE_SELECT 1
		41	# endif
		42
		43	# if HAVE_POLL && HAVE_POLL_H
		44	# define EV_USE_POLL 1
		45	# endif
		46
		47	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		48	# define EV_USE_EPOLL 1
		49	# endif
		50
		51	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		52	# define EV_USE_KQUEUE 1
		53	# endif
		54
		55	#endif
		56
1	#include <math.h>	57	#include <math.h>
2	#include <stdlib.h>	58	#include <stdlib.h>
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
14	#define HAVE_EPOLL 1	69	#include <signal.h>
15		70
		71	#ifndef WIN32
		72	# include <unistd.h>
		73	# include <sys/time.h>
		74	# include <sys/wait.h>
		75	#endif
		76	/**/
		77
16	#ifndef HAVE_MONOTONIC	78	#ifndef EV_USE_MONOTONIC
17	# ifdef CLOCK_MONOTONIC
18	# 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
19	# endif	105	# endif
20	#endif	106	#endif
21		107
22	#ifndef HAVE_SELECT
23	# define HAVE_SELECT 1
24	#endif
25
26	#ifndef HAVE_EPOLL
27	# define HAVE_EPOLL 0
28	#endif
29
30	#ifndef HAVE_REALTIME	108	#ifndef EV_USE_REALTIME
31	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	109	# define EV_USE_REALTIME 1
32	#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	/**/
33		125
34	#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) */
35	#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 */
36		130
37	#include "ev.h"	131	#include "ev.h"
		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)
38		146
39	typedef struct ev_watcher *W;	147	typedef struct ev_watcher *W;
40	typedef struct ev_watcher_list *WL;	148	typedef struct ev_watcher_list *WL;
41	typedef struct ev_watcher_time *WT;	149	typedef struct ev_watcher_time *WT;
42		150
43	static ev_tstamp now, diff; /* monotonic clock */	151	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
44	ev_tstamp ev_now;
45	int ev_method;
46		152
47	static int have_monotonic; /* runtime */	153	#include "ev_win32.c"
48
49	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
50	static void (*method_modify)(int fd, int oev, int nev);
51	static void (*method_poll)(ev_tstamp timeout);
52		154
53	/*****************************************************************************/	155	/*****************************************************************************/
54		156
55	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
56	ev_time (void)	239	ev_time (void)
57	{	240	{
58	#if HAVE_REALTIME	241	#if EV_USE_REALTIME
59	struct timespec ts;	242	struct timespec ts;
60	clock_gettime (CLOCK_REALTIME, &ts);	243	clock_gettime (CLOCK_REALTIME, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	244	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	#else	245	#else
63	struct timeval tv;	246	struct timeval tv;
64	gettimeofday (&tv, 0);	247	gettimeofday (&tv, 0);
65	return tv.tv_sec + tv.tv_usec * 1e-6;	248	return tv.tv_sec + tv.tv_usec * 1e-6;
66	#endif	249	#endif
67	}	250	}
68		251
69	static ev_tstamp	252	inline ev_tstamp
70	get_clock (void)	253	get_clock (void)
71	{	254	{
72	#if HAVE_MONOTONIC	255	#if EV_USE_MONOTONIC
73	if (have_monotonic)	256	if (expect_true (have_monotonic))
74	{	257	{
75	struct timespec ts;	258	struct timespec ts;
76	clock_gettime (CLOCK_MONOTONIC, &ts);	259	clock_gettime (CLOCK_MONOTONIC, &ts);
77	return ts.tv_sec + ts.tv_nsec * 1e-9;	260	return ts.tv_sec + ts.tv_nsec * 1e-9;
78	}	261	}
79	#endif	262	#endif
80		263
81	return ev_time ();	264	return ev_time ();
82	}	265	}
83		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
84	#define array_needsize(base,cur,cnt,init) \	275	#define array_needsize(type,base,cur,cnt,init) \
85	if ((cnt) > cur) \	276	if (expect_false ((cnt) > cur)) \
86	{ \	277	{ \
87	int newcnt = cur ? cur << 1 : 16; \	278	int newcnt = cur; \
88	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	\
89	base = realloc (base, sizeof (base) (newcnt)); \	285	base = (type )ev_realloc (base, sizeof (type) (newcnt));\
90	init (base + cur, newcnt - cur); \	286	init (base + cur, newcnt - cur); \
91	cur = newcnt; \	287	cur = newcnt; \
92	}	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;
93		305
94	/*****************************************************************************/	306	/*****************************************************************************/
95		307
96	typedef struct
97	{
98	struct ev_io *head;
99	unsigned char wev, rev; /* want, received event set */
100	} ANFD;
101
102	static ANFD *anfds;
103	static int anfdmax;
104
105	static int *fdchanges;
106	static int fdchangemax, fdchangecnt;
107
108	static void	308	static void
109	anfds_init (ANFD *base, int count)	309	anfds_init (ANFD *base, int count)
110	{	310	{
111	while (count--)	311	while (count--)
112	{	312	{
113	base->head = 0;	313	base->head = 0;
114	base->wev = base->rev = EV_NONE;	314	base->events = EV_NONE;
		315	base->reify = 0;
		316
115	++base;	317	++base;
116	}	318	}
117	}	319	}
118		320
119	typedef struct	321	void
		322	ev_feed_event (EV_P_ void *w, int revents)
120	{	323	{
121	W w;	324	W w_ = (W)w;
122	int events;
123	} ANPENDING;
124		325
125	static ANPENDING *pendings;	326	if (w_->pending)
126	static int pendingmax, pendingcnt;	327	{
		328	pendings [ABSPRI (w_)][w_->pending - 1].events \|= revents;
		329	return;
		330	}
127		331
128	static void
129	event (W w, int events)
130	{
131	w->pending = ++pendingcnt;	332	w_->pending = ++pendingcnt [ABSPRI (w_)];
132	array_needsize (pendings, pendingmax, pendingcnt, );	333	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
133	pendings [pendingcnt - 1].w = w;	334	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
134	pendings [pendingcnt - 1].events = events;	335	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
135	}	336	}
136		337
137	static void	338	static void
		339	queue_events (EV_P_ W *events, int eventcnt, int type)
		340	{
		341	int i;
		342
		343	for (i = 0; i < eventcnt; ++i)
		344	ev_feed_event (EV_A_ events [i], type);
		345	}
		346
		347	static void
138	fd_event (int fd, int events)	348	fd_event (EV_P_ int fd, int events)
139	{	349	{
140	ANFD *anfd = anfds + fd;	350	ANFD *anfd = anfds + fd;
141	struct ev_io *w;	351	struct ev_io *w;
142		352
143	for (w = anfd->head; w; w = w->next)	353	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
144	{	354	{
145	int ev = w->events & events;	355	int ev = w->events & events;
146		356
147	if (ev)	357	if (ev)
148	event ((W)w, ev);	358	ev_feed_event (EV_A_ (W)w, ev);
149	}	359	}
150	}	360	}
151		361
		362	/*****************************************************************************/
		363
152	static void	364	static void
153	queue_events (W *events, int eventcnt, int type)	365	fd_reify (EV_P)
154	{	366	{
155	int i;	367	int i;
156		368
157	for (i = 0; i < eventcnt; ++i)	369	for (i = 0; i < fdchangecnt; ++i)
158	event (events [i], type);	370	{
		371	int fd = fdchanges [i];
		372	ANFD *anfd = anfds + fd;
		373	struct ev_io *w;
		374
		375	int events = 0;
		376
		377	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
		378	events \|= w->events;
		379
		380	anfd->reify = 0;
		381
		382	method_modify (EV_A_ fd, anfd->events, events);
		383	anfd->events = events;
		384	}
		385
		386	fdchangecnt = 0;
		387	}
		388
		389	static void
		390	fd_change (EV_P_ int fd)
		391	{
		392	if (anfds [fd].reify)
		393	return;
		394
		395	anfds [fd].reify = 1;
		396
		397	++fdchangecnt;
		398	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		399	fdchanges [fdchangecnt - 1] = fd;
		400	}
		401
		402	static void
		403	fd_kill (EV_P_ int fd)
		404	{
		405	struct ev_io *w;
		406
		407	while ((w = (struct ev_io *)anfds [fd].head))
		408	{
		409	ev_io_stop (EV_A_ w);
		410	ev_feed_event (EV_A_ (W)w, EV_ERROR \| EV_READ \| EV_WRITE);
		411	}
		412	}
		413
		414	static int
		415	fd_valid (int fd)
		416	{
		417	#ifdef WIN32
		418	return !!win32_get_osfhandle (fd);
		419	#else
		420	return fcntl (fd, F_GETFD) != -1;
		421	#endif
		422	}
		423
		424	/* called on EBADF to verify fds */
		425	static void
		426	fd_ebadf (EV_P)
		427	{
		428	int fd;
		429
		430	for (fd = 0; fd < anfdmax; ++fd)
		431	if (anfds [fd].events)
		432	if (!fd_valid (fd) == -1 && errno == EBADF)
		433	fd_kill (EV_A_ fd);
		434	}
		435
		436	/* called on ENOMEM in select/poll to kill some fds and retry */
		437	static void
		438	fd_enomem (EV_P)
		439	{
		440	int fd;
		441
		442	for (fd = anfdmax; fd--; )
		443	if (anfds [fd].events)
		444	{
		445	fd_kill (EV_A_ fd);
		446	return;
		447	}
		448	}
		449
		450	/* usually called after fork if method needs to re-arm all fds from scratch */
		451	static void
		452	fd_rearm_all (EV_P)
		453	{
		454	int fd;
		455
		456	/* this should be highly optimised to not do anything but set a flag */
		457	for (fd = 0; fd < anfdmax; ++fd)
		458	if (anfds [fd].events)
		459	{
		460	anfds [fd].events = 0;
		461	fd_change (EV_A_ fd);
		462	}
159	}	463	}
160		464
161	/*****************************************************************************/	465	/*****************************************************************************/
162		466
163	static struct ev_timer **timers;
164	static int timermax, timercnt;
165
166	static struct ev_periodic **periodics;
167	static int periodicmax, periodiccnt;
168
169	static void	467	static void
170	upheap (WT *timers, int k)	468	upheap (WT *heap, int k)
171	{	469	{
172	WT w = timers [k];	470	WT w = heap [k];
173		471
174	while (k && timers [k >> 1]->at > w->at)	472	while (k && heap [k >> 1]->at > w->at)
175	{	473	{
176	timers [k] = timers [k >> 1];	474	heap [k] = heap [k >> 1];
177	timers [k]->active = k + 1;	475	((W)heap [k])->active = k + 1;
178	k >>= 1;	476	k >>= 1;
179	}	477	}
180		478
181	timers [k] = w;	479	heap [k] = w;
182	timers [k]->active = k + 1;	480	((W)heap [k])->active = k + 1;
183		481
184	}	482	}
185		483
186	static void	484	static void
187	downheap (WT *timers, int N, int k)	485	downheap (WT *heap, int N, int k)
188	{	486	{
189	WT w = timers [k];	487	WT w = heap [k];
190		488
191	while (k < (N >> 1))	489	while (k < (N >> 1))
192	{	490	{
193	int j = k << 1;	491	int j = k << 1;
194		492
195	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	493	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
196	++j;	494	++j;
197		495
198	if (w->at <= timers [j]->at)	496	if (w->at <= heap [j]->at)
199	break;	497	break;
200		498
201	timers [k] = timers [j];	499	heap [k] = heap [j];
202	timers [k]->active = k + 1;	500	((W)heap [k])->active = k + 1;
203	k = j;	501	k = j;
204	}	502	}
205		503
206	timers [k] = w;	504	heap [k] = w;
207	timers [k]->active = k + 1;	505	((W)heap [k])->active = k + 1;
208	}	506	}
209		507
210	/*****************************************************************************/	508	/*****************************************************************************/
211		509
212	typedef struct	510	typedef struct
213	{	511	{
214	struct ev_signal *head;	512	WL head;
215	sig_atomic_t gotsig;	513	sig_atomic_t volatile gotsig;
216	} ANSIG;	514	} ANSIG;
217		515
218	static ANSIG *signals;	516	static ANSIG *signals;
219	static int signalmax;	517	static int signalmax;
220		518
221	static int sigpipe [2];	519	static int sigpipe [2];
222	static sig_atomic_t gotsig;	520	static sig_atomic_t volatile gotsig;
223	static struct ev_io sigev;	521	static struct ev_io sigev;
224		522
225	static void	523	static void
226	signals_init (ANSIG *base, int count)	524	signals_init (ANSIG *base, int count)
227	{	525	{
228	while (count--)	526	while (count--)
229	{	527	{
230	base->head = 0;	528	base->head = 0;
231	base->gotsig = 0;	529	base->gotsig = 0;
		530
232	++base;	531	++base;
233	}	532	}
234	}	533	}
235		534
236	static void	535	static void
237	sighandler (int signum)	536	sighandler (int signum)
238	{	537	{
		538	#if WIN32
		539	signal (signum, sighandler);
		540	#endif
		541
239	signals [signum - 1].gotsig = 1;	542	signals [signum - 1].gotsig = 1;
240		543
241	if (!gotsig)	544	if (!gotsig)
242	{	545	{
		546	int old_errno = errno;
243	gotsig = 1;	547	gotsig = 1;
		548	#ifdef WIN32
		549	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		550	#else
244	write (sigpipe [1], &gotsig, 1);	551	write (sigpipe [1], &signum, 1);
		552	#endif
		553	errno = old_errno;
245	}	554	}
246	}	555	}
247		556
248	static void	557	static void
249	sigcb (struct ev_io *iow, int revents)	558	sigcb (EV_P_ struct ev_io *iow, int revents)
250	{	559	{
251	struct ev_signal *w;	560	WL w;
252	int sig;	561	int signum;
253		562
		563	#ifdef WIN32
		564	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		565	#else
		566	read (sigpipe [0], &revents, 1);
		567	#endif
254	gotsig = 0;	568	gotsig = 0;
255	read (sigpipe [0], &revents, 1);
256		569
257	for (sig = signalmax; sig--; )	570	for (signum = signalmax; signum--; )
258	if (signals [sig].gotsig)	571	if (signals [signum].gotsig)
259	{	572	{
260	signals [sig].gotsig = 0;	573	signals [signum].gotsig = 0;
261		574
262	for (w = signals [sig].head; w; w = w->next)	575	for (w = signals [signum].head; w; w = w->next)
263	event ((W)w, EV_SIGNAL);	576	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
264	}	577	}
265	}	578	}
266		579
267	static void	580	static void
268	siginit (void)	581	siginit (EV_P)
269	{	582	{
		583	#ifndef WIN32
270	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	584	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
271	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	585	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
272		586
273	/* rather than sort out wether we really need nb, set it */	587	/* rather than sort out wether we really need nb, set it */
274	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	588	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
275	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	589	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		590	#endif
276		591
277	evio_set (&sigev, sigpipe [0], EV_READ);	592	ev_io_set (&sigev, sigpipe [0], EV_READ);
278	evio_start (&sigev);	593	ev_io_start (EV_A_ &sigev);
		594	ev_unref (EV_A); /* child watcher should not keep loop alive */
279	}	595	}
280		596
281	/*****************************************************************************/	597	/*****************************************************************************/
282		598
283	static struct ev_idle **idles;	599	static struct ev_child *childs [PID_HASHSIZE];
284	static int idlemax, idlecnt;
285		600
286	static struct ev_check **checks;	601	#ifndef WIN32
287	static int checkmax, checkcnt;	602
		603	static struct ev_signal childev;
		604
		605	#ifndef WCONTINUED
		606	# define WCONTINUED 0
		607	#endif
		608
		609	static void
		610	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		611	{
		612	struct ev_child *w;
		613
		614	for (w = (struct ev_child )childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child )((WL)w)->next)
		615	if (w->pid == pid \|\| !w->pid)
		616	{
		617	ev_priority (w) = ev_priority (sw); /* need to do it now */
		618	w->rpid = pid;
		619	w->rstatus = status;
		620	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		621	}
		622	}
		623
		624	static void
		625	childcb (EV_P_ struct ev_signal *sw, int revents)
		626	{
		627	int pid, status;
		628
		629	if (0 < (pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)))
		630	{
		631	/* make sure we are called again until all childs have been reaped */
		632	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		633
		634	child_reap (EV_A_ sw, pid, pid, status);
		635	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		636	}
		637	}
		638
		639	#endif
288		640
289	/*****************************************************************************/	641	/*****************************************************************************/
290		642
		643	#if EV_USE_KQUEUE
		644	# include "ev_kqueue.c"
		645	#endif
291	#if HAVE_EPOLL	646	#if EV_USE_EPOLL
292	# include "ev_epoll.c"	647	# include "ev_epoll.c"
293	#endif	648	#endif
		649	#if EV_USE_POLL
		650	# include "ev_poll.c"
		651	#endif
294	#if HAVE_SELECT	652	#if EV_USE_SELECT
295	# include "ev_select.c"	653	# include "ev_select.c"
296	#endif	654	#endif
297		655
298	int ev_init (int flags)	656	int
		657	ev_version_major (void)
299	{	658	{
		659	return EV_VERSION_MAJOR;
		660	}
		661
		662	int
		663	ev_version_minor (void)
		664	{
		665	return EV_VERSION_MINOR;
		666	}
		667
		668	/* return true if we are running with elevated privileges and should ignore env variables */
		669	static int
		670	enable_secure (void)
		671	{
		672	#ifdef WIN32
		673	return 0;
		674	#else
		675	return getuid () != geteuid ()
		676	\|\| getgid () != getegid ();
		677	#endif
		678	}
		679
		680	int
		681	ev_method (EV_P)
		682	{
		683	return method;
		684	}
		685
		686	static void
		687	loop_init (EV_P_ int methods)
		688	{
		689	if (!method)
		690	{
300	#if HAVE_MONOTONIC	691	#if EV_USE_MONOTONIC
301	{	692	{
302	struct timespec ts;	693	struct timespec ts;
303	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	694	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
304	have_monotonic = 1;	695	have_monotonic = 1;
305	}	696	}
306	#endif	697	#endif
307		698
308	ev_now = ev_time ();	699	rt_now = ev_time ();
309	now = get_clock ();	700	mn_now = get_clock ();
310	diff = ev_now - now;	701	now_floor = mn_now;
		702	rtmn_diff = rt_now - mn_now;
311		703
		704	if (methods == EVMETHOD_AUTO)
		705	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		706	methods = atoi (getenv ("LIBEV_METHODS"));
		707	else
		708	methods = EVMETHOD_ANY;
		709
		710	method = 0;
		711	#if EV_USE_WIN32
		712	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		713	#endif
		714	#if EV_USE_KQUEUE
		715	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		716	#endif
		717	#if EV_USE_EPOLL
		718	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		719	#endif
		720	#if EV_USE_POLL
		721	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		722	#endif
		723	#if EV_USE_SELECT
		724	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		725	#endif
		726
		727	ev_watcher_init (&sigev, sigcb);
		728	ev_set_priority (&sigev, EV_MAXPRI);
		729	}
		730	}
		731
		732	void
		733	loop_destroy (EV_P)
		734	{
		735	int i;
		736
		737	#if EV_USE_WIN32
		738	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		739	#endif
		740	#if EV_USE_KQUEUE
		741	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		742	#endif
		743	#if EV_USE_EPOLL
		744	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		745	#endif
		746	#if EV_USE_POLL
		747	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		748	#endif
		749	#if EV_USE_SELECT
		750	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		751	#endif
		752
		753	for (i = NUMPRI; i--; )
		754	array_free (pending, [i]);
		755
		756	/* have to use the microsoft-never-gets-it-right macro */
		757	array_free_microshit (fdchange);
		758	array_free_microshit (timer);
		759	array_free_microshit (periodic);
		760	array_free_microshit (idle);
		761	array_free_microshit (prepare);
		762	array_free_microshit (check);
		763
		764	method = 0;
		765	}
		766
		767	static void
		768	loop_fork (EV_P)
		769	{
		770	#if EV_USE_EPOLL
		771	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		772	#endif
		773	#if EV_USE_KQUEUE
		774	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		775	#endif
		776
		777	if (ev_is_active (&sigev))
		778	{
		779	/* default loop */
		780
		781	ev_ref (EV_A);
		782	ev_io_stop (EV_A_ &sigev);
		783	close (sigpipe [0]);
		784	close (sigpipe [1]);
		785
		786	while (pipe (sigpipe))
		787	syserr ("(libev) error creating pipe");
		788
		789	siginit (EV_A);
		790	}
		791
		792	postfork = 0;
		793	}
		794
		795	#if EV_MULTIPLICITY
		796	struct ev_loop *
		797	ev_loop_new (int methods)
		798	{
		799	struct ev_loop loop = (struct ev_loop )ev_malloc (sizeof (struct ev_loop));
		800
		801	memset (loop, 0, sizeof (struct ev_loop));
		802
		803	loop_init (EV_A_ methods);
		804
		805	if (ev_method (EV_A))
		806	return loop;
		807
		808	return 0;
		809	}
		810
		811	void
		812	ev_loop_destroy (EV_P)
		813	{
		814	loop_destroy (EV_A);
		815	ev_free (loop);
		816	}
		817
		818	void
		819	ev_loop_fork (EV_P)
		820	{
		821	postfork = 1;
		822	}
		823
		824	#endif
		825
		826	#if EV_MULTIPLICITY
		827	struct ev_loop default_loop_struct;
		828	static struct ev_loop *default_loop;
		829
		830	struct ev_loop *
		831	#else
		832	static int default_loop;
		833
		834	int
		835	#endif
		836	ev_default_loop (int methods)
		837	{
		838	if (sigpipe [0] == sigpipe [1])
312	if (pipe (sigpipe))	839	if (pipe (sigpipe))
313	return 0;	840	return 0;
314		841
315	ev_method = EVMETHOD_NONE;	842	if (!default_loop)
316	#if HAVE_EPOLL	843	{
317	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	844	#if EV_MULTIPLICITY
		845	struct ev_loop *loop = default_loop = &default_loop_struct;
		846	#else
		847	default_loop = 1;
318	#endif	848	#endif
319	#if HAVE_SELECT
320	if (ev_method == EVMETHOD_NONE) select_init (flags);
321	#endif
322		849
		850	loop_init (EV_A_ methods);
		851
		852	if (ev_method (EV_A))
		853	{
		854	siginit (EV_A);
		855
		856	#ifndef WIN32
		857	ev_signal_init (&childev, childcb, SIGCHLD);
		858	ev_set_priority (&childev, EV_MAXPRI);
		859	ev_signal_start (EV_A_ &childev);
		860	ev_unref (EV_A); /* child watcher should not keep loop alive */
		861	#endif
		862	}
		863	else
		864	default_loop = 0;
		865	}
		866
		867	return default_loop;
		868	}
		869
		870	void
		871	ev_default_destroy (void)
		872	{
		873	#if EV_MULTIPLICITY
		874	struct ev_loop *loop = default_loop;
		875	#endif
		876
		877	#ifndef WIN32
		878	ev_ref (EV_A); /* child watcher */
		879	ev_signal_stop (EV_A_ &childev);
		880	#endif
		881
		882	ev_ref (EV_A); /* signal watcher */
		883	ev_io_stop (EV_A_ &sigev);
		884
		885	close (sigpipe [0]); sigpipe [0] = 0;
		886	close (sigpipe [1]); sigpipe [1] = 0;
		887
		888	loop_destroy (EV_A);
		889	}
		890
		891	void
		892	ev_default_fork (void)
		893	{
		894	#if EV_MULTIPLICITY
		895	struct ev_loop *loop = default_loop;
		896	#endif
		897
323	if (ev_method)	898	if (method)
324	{	899	postfork = 1;
325	evw_init (&sigev, sigcb);
326	siginit ();
327	}
328
329	return ev_method;
330	}	900	}
331		901
332	/*****************************************************************************/	902	/*****************************************************************************/
333		903
334	void ev_prefork (void)
335	{
336	/* nop */
337	}
338
339	void ev_postfork_parent (void)
340	{
341	/* nop */
342	}
343
344	void ev_postfork_child (void)
345	{
346	#if HAVE_EPOLL
347	if (ev_method == EVMETHOD_EPOLL)
348	epoll_postfork_child ();
349	#endif
350
351	evio_stop (&sigev);
352	close (sigpipe [0]);
353	close (sigpipe [1]);
354	pipe (sigpipe);
355	siginit ();
356	}
357
358	/*****************************************************************************/
359
360	static void	904	static int
361	fd_reify (void)	905	any_pending (EV_P)
362	{	906	{
363	int i;	907	int pri;
364		908
365	for (i = 0; i < fdchangecnt; ++i)	909	for (pri = NUMPRI; pri--; )
366	{	910	if (pendingcnt [pri])
367	int fd = fdchanges [i];	911	return 1;
368	ANFD *anfd = anfds + fd;
369	struct ev_io *w;
370		912
371	int wev = 0;	913	return 0;
372
373	for (w = anfd->head; w; w = w->next)
374	wev \|= w->events;
375
376	if (anfd->wev != wev)
377	{
378	method_modify (fd, anfd->wev, wev);
379	anfd->wev = wev;
380	}
381	}
382
383	fdchangecnt = 0;
384	}	914	}
385		915
386	static void	916	static void
387	call_pending ()	917	call_pending (EV_P)
388	{	918	{
389	int i;	919	int pri;
390		920
391	for (i = 0; i < pendingcnt; ++i)	921	for (pri = NUMPRI; pri--; )
		922	while (pendingcnt [pri])
392	{	923	{
393	ANPENDING *p = pendings + i;	924	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
394		925
395	if (p->w)	926	if (p->w)
396	{	927	{
397	p->w->pending = 0;	928	p->w->pending = 0;
398	p->w->cb (p->w, p->events);	929	p->w->cb (EV_A_ p->w, p->events);
399	}	930	}
400	}	931	}
401
402	pendingcnt = 0;
403	}	932	}
404		933
405	static void	934	static void
406	timers_reify ()	935	timers_reify (EV_P)
407	{	936	{
408	while (timercnt && timers [0]->at <= now)	937	while (timercnt && ((WT)timers [0])->at <= mn_now)
409	{	938	{
410	struct ev_timer *w = timers [0];	939	struct ev_timer *w = timers [0];
		940
		941	assert (("inactive timer on timer heap detected", ev_is_active (w)));
411		942
412	/* first reschedule or stop timer */	943	/* first reschedule or stop timer */
413	if (w->repeat)	944	if (w->repeat)
414	{	945	{
		946	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
415	w->at = now + w->repeat;	947	((WT)w)->at = mn_now + w->repeat;
416	assert (("timer timeout in the past, negative repeat?", w->at > now));
417	downheap ((WT *)timers, timercnt, 0);	948	downheap ((WT *)timers, timercnt, 0);
418	}	949	}
419	else	950	else
420	evtimer_stop (w); /* nonrepeating: stop timer */	951	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
421		952
422	event ((W)w, EV_TIMEOUT);	953	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
423	}	954	}
424	}	955	}
425		956
426	static void	957	static void
427	periodics_reify ()	958	periodics_reify (EV_P)
428	{	959	{
429	while (periodiccnt && periodics [0]->at <= ev_now)	960	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
430	{	961	{
431	struct ev_periodic *w = periodics [0];	962	struct ev_periodic *w = periodics [0];
432		963
		964	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		965
433	/* first reschedule or stop timer */	966	/* first reschedule or stop timer */
434	if (w->interval)	967	if (w->reschedule_cb)
435	{	968	{
		969	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, rt_now + 0.0001);
		970
		971	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > rt_now));
		972	downheap ((WT *)periodics, periodiccnt, 0);
		973	}
		974	else if (w->interval)
		975	{
436	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;	976	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
437	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));	977	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
438	downheap ((WT *)periodics, periodiccnt, 0);	978	downheap ((WT *)periodics, periodiccnt, 0);
439	}	979	}
440	else	980	else
441	evperiodic_stop (w); /* nonrepeating: stop timer */	981	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
442		982
443	event ((W)w, EV_TIMEOUT);	983	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
444	}	984	}
445	}	985	}
446		986
447	static void	987	static void
448	periodics_reschedule (ev_tstamp diff)	988	periodics_reschedule (EV_P)
449	{	989	{
450	int i;	990	int i;
451		991
452	/* adjust periodics after time jump */	992	/* adjust periodics after time jump */
453	for (i = 0; i < periodiccnt; ++i)	993	for (i = 0; i < periodiccnt; ++i)
454	{	994	{
455	struct ev_periodic *w = periodics [i];	995	struct ev_periodic *w = periodics [i];
456		996
		997	if (w->reschedule_cb)
		998	((WT)w)->at = w->reschedule_cb (w, rt_now);
457	if (w->interval)	999	else if (w->interval)
		1000	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1001	}
		1002
		1003	/* now rebuild the heap */
		1004	for (i = periodiccnt >> 1; i--; )
		1005	downheap ((WT *)periodics, periodiccnt, i);
		1006	}
		1007
		1008	inline int
		1009	time_update_monotonic (EV_P)
		1010	{
		1011	mn_now = get_clock ();
		1012
		1013	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1014	{
		1015	rt_now = rtmn_diff + mn_now;
		1016	return 0;
		1017	}
		1018	else
		1019	{
		1020	now_floor = mn_now;
		1021	rt_now = ev_time ();
		1022	return 1;
		1023	}
		1024	}
		1025
		1026	static void
		1027	time_update (EV_P)
		1028	{
		1029	int i;
		1030
		1031	#if EV_USE_MONOTONIC
		1032	if (expect_true (have_monotonic))
		1033	{
		1034	if (time_update_monotonic (EV_A))
458	{	1035	{
459	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;	1036	ev_tstamp odiff = rtmn_diff;
460		1037
461	if (fabs (diff) >= 1e-4)	1038	for (i = 4; --i; ) /* loop a few times, before making important decisions */
462	{	1039	{
463	evperiodic_stop (w);	1040	rtmn_diff = rt_now - mn_now;
464	evperiodic_start (w);
465		1041
466	i = 0; /* restart loop, inefficient, but time jumps should be rare */	1042	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1043	return; /* all is well */
		1044
		1045	rt_now = ev_time ();
		1046	mn_now = get_clock ();
		1047	now_floor = mn_now;
467	}	1048	}
		1049
		1050	periodics_reschedule (EV_A);
		1051	/* no timer adjustment, as the monotonic clock doesn't jump */
		1052	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
468	}	1053	}
469	}	1054	}
470	}	1055	else
471		1056	#endif
472	static void	1057	{
473	time_update ()
474	{
475	int i;
476
477	ev_now = ev_time ();	1058	rt_now = ev_time ();
478		1059
479	if (have_monotonic)	1060	if (expect_false (mn_now > rt_now \|\| mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
480	{
481	ev_tstamp odiff = diff;
482
483	for (i = 4; --i; ) /* loop a few times, before making important decisions */
484	{	1061	{
485	now = get_clock ();
486	diff = ev_now - now;
487
488	if (fabs (odiff - diff) < MIN_TIMEJUMP)
489	return; /* all is well */
490
491	ev_now = ev_time ();
492	}
493
494	periodics_reschedule (diff - odiff);
495	/* no timer adjustment, as the monotonic clock doesn't jump */
496	}
497	else
498	{
499	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
500	{
501	periodics_reschedule (ev_now - now);	1062	periodics_reschedule (EV_A);
502		1063
503	/* adjust timers. this is easy, as the offset is the same for all */	1064	/* adjust timers. this is easy, as the offset is the same for all */
504	for (i = 0; i < timercnt; ++i)	1065	for (i = 0; i < timercnt; ++i)
505	timers [i]->at += diff;	1066	((WT)timers [i])->at += rt_now - mn_now;
506	}	1067	}
507		1068
508	now = ev_now;	1069	mn_now = rt_now;
509	}	1070	}
510	}	1071	}
511		1072
512	int ev_loop_done;	1073	void
		1074	ev_ref (EV_P)
		1075	{
		1076	++activecnt;
		1077	}
513		1078
		1079	void
		1080	ev_unref (EV_P)
		1081	{
		1082	--activecnt;
		1083	}
		1084
		1085	static int loop_done;
		1086
		1087	void
514	void ev_loop (int flags)	1088	ev_loop (EV_P_ int flags)
515	{	1089	{
516	double block;	1090	double block;
517	ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;	1091	loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
518
519	if (checkcnt)
520	{
521	queue_events ((W *)checks, checkcnt, EV_CHECK);
522	call_pending ();
523	}
524		1092
525	do	1093	do
526	{	1094	{
		1095	/* queue check watchers (and execute them) */
		1096	if (expect_false (preparecnt))
		1097	{
		1098	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1099	call_pending (EV_A);
		1100	}
		1101
		1102	/* we might have forked, so reify kernel state if necessary */
		1103	if (expect_false (postfork))
		1104	loop_fork (EV_A);
		1105
527	/* update fd-related kernel structures */	1106	/* update fd-related kernel structures */
528	fd_reify ();	1107	fd_reify (EV_A);
529		1108
530	/* calculate blocking time */	1109	/* calculate blocking time */
531		1110
532	/* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */	1111	/* we only need this for !monotonic clock or timers, but as we basically
		1112	always have timers, we just calculate it always */
		1113	#if EV_USE_MONOTONIC
		1114	if (expect_true (have_monotonic))
		1115	time_update_monotonic (EV_A);
		1116	else
		1117	#endif
		1118	{
533	ev_now = ev_time ();	1119	rt_now = ev_time ();
		1120	mn_now = rt_now;
		1121	}
534		1122
535	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)	1123	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
536	block = 0.;	1124	block = 0.;
537	else	1125	else
538	{	1126	{
539	block = MAX_BLOCKTIME;	1127	block = MAX_BLOCKTIME;
540		1128
541	if (timercnt)	1129	if (timercnt)
542	{	1130	{
543	ev_tstamp to = timers [0]->at - get_clock () + method_fudge;	1131	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
544	if (block > to) block = to;	1132	if (block > to) block = to;
545	}	1133	}
546		1134
547	if (periodiccnt)	1135	if (periodiccnt)
548	{	1136	{
549	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;	1137	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
550	if (block > to) block = to;	1138	if (block > to) block = to;
551	}	1139	}
552		1140
553	if (block < 0.) block = 0.;	1141	if (block < 0.) block = 0.;
554	}	1142	}
555		1143
556	method_poll (block);	1144	method_poll (EV_A_ block);
557		1145
558	/* update ev_now, do magic */	1146	/* update rt_now, do magic */
559	time_update ();	1147	time_update (EV_A);
560		1148
561	/* queue pending timers and reschedule them */	1149	/* queue pending timers and reschedule them */
		1150	timers_reify (EV_A); /* relative timers called last */
562	periodics_reify (); /* absolute timers first */	1151	periodics_reify (EV_A); /* absolute timers called first */
563	timers_reify (); /* relative timers second */
564		1152
565	/* queue idle watchers unless io or timers are pending */	1153	/* queue idle watchers unless io or timers are pending */
566	if (!pendingcnt)	1154	if (idlecnt && !any_pending (EV_A))
567	queue_events ((W *)idles, idlecnt, EV_IDLE);	1155	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
568		1156
569	/* queue check and possibly idle watchers */	1157	/* queue check watchers, to be executed first */
		1158	if (checkcnt)
570	queue_events ((W *)checks, checkcnt, EV_CHECK);	1159	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
571		1160
572	call_pending ();	1161	call_pending (EV_A);
573	}	1162	}
574	while (!ev_loop_done);	1163	while (activecnt && !loop_done);
575		1164
576	if (ev_loop_done != 2)	1165	if (loop_done != 2)
577	ev_loop_done = 0;	1166	loop_done = 0;
		1167	}
		1168
		1169	void
		1170	ev_unloop (EV_P_ int how)
		1171	{
		1172	loop_done = how;
578	}	1173	}
579		1174
580	/*****************************************************************************/	1175	/*****************************************************************************/
581		1176
582	static void	1177	inline void
583	wlist_add (WL *head, WL elem)	1178	wlist_add (WL *head, WL elem)
584	{	1179	{
585	elem->next = *head;	1180	elem->next = *head;
586	*head = elem;	1181	*head = elem;
587	}	1182	}
588		1183
589	static void	1184	inline void
590	wlist_del (WL *head, WL elem)	1185	wlist_del (WL *head, WL elem)
591	{	1186	{
592	while (*head)	1187	while (*head)
593	{	1188	{
594	if (*head == elem)	1189	if (*head == elem)
599		1194
600	head = &(*head)->next;	1195	head = &(*head)->next;
601	}	1196	}
602	}	1197	}
603		1198
604	static void	1199	inline void
		1200	ev_clear_pending (EV_P_ W w)
		1201	{
		1202	if (w->pending)
		1203	{
		1204	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1205	w->pending = 0;
		1206	}
		1207	}
		1208
		1209	inline void
605	ev_start (W w, int active)	1210	ev_start (EV_P_ W w, int active)
606	{	1211	{
607	w->pending = 0;	1212	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1213	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1214
608	w->active = active;	1215	w->active = active;
		1216	ev_ref (EV_A);
609	}	1217	}
610		1218
611	static void	1219	inline void
612	ev_stop (W w)	1220	ev_stop (EV_P_ W w)
613	{	1221	{
614	if (w->pending)	1222	ev_unref (EV_A);
615	pendings [w->pending - 1].w = 0;
616
617	w->active = 0;	1223	w->active = 0;
618	}	1224	}
619		1225
620	/*****************************************************************************/	1226	/*****************************************************************************/
621		1227
622	void	1228	void
623	evio_start (struct ev_io *w)	1229	ev_io_start (EV_P_ struct ev_io *w)
624	{	1230	{
		1231	int fd = w->fd;
		1232
625	if (ev_is_active (w))	1233	if (ev_is_active (w))
626	return;	1234	return;
627		1235
628	int fd = w->fd;	1236	assert (("ev_io_start called with negative fd", fd >= 0));
629		1237
630	ev_start ((W)w, 1);	1238	ev_start (EV_A_ (W)w, 1);
631	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1239	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
632	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1240	wlist_add ((WL *)&anfds[fd].head, (WL)w);
633		1241
634	++fdchangecnt;	1242	fd_change (EV_A_ fd);
635	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
636	fdchanges [fdchangecnt - 1] = fd;
637	}	1243	}
638		1244
639	void	1245	void
640	evio_stop (struct ev_io *w)	1246	ev_io_stop (EV_P_ struct ev_io *w)
641	{	1247	{
		1248	ev_clear_pending (EV_A_ (W)w);
642	if (!ev_is_active (w))	1249	if (!ev_is_active (w))
643	return;	1250	return;
644		1251
645	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1252	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
646	ev_stop ((W)w);	1253	ev_stop (EV_A_ (W)w);
647		1254
648	++fdchangecnt;	1255	fd_change (EV_A_ w->fd);
649	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
650	fdchanges [fdchangecnt - 1] = w->fd;
651	}	1256	}
652		1257
653
654	void	1258	void
655	evtimer_start (struct ev_timer *w)	1259	ev_timer_start (EV_P_ struct ev_timer *w)
656	{	1260	{
657	if (ev_is_active (w))	1261	if (ev_is_active (w))
658	return;	1262	return;
659		1263
660	w->at += now;	1264	((WT)w)->at += mn_now;
661		1265
662	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));	1266	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
663		1267
664	ev_start ((W)w, ++timercnt);	1268	ev_start (EV_A_ (W)w, ++timercnt);
665	array_needsize (timers, timermax, timercnt, );	1269	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
666	timers [timercnt - 1] = w;	1270	timers [timercnt - 1] = w;
667	upheap ((WT *)timers, timercnt - 1);	1271	upheap ((WT *)timers, timercnt - 1);
668	}
669		1272
		1273	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1274	}
		1275
670	void	1276	void
671	evtimer_stop (struct ev_timer *w)	1277	ev_timer_stop (EV_P_ struct ev_timer *w)
672	{	1278	{
		1279	ev_clear_pending (EV_A_ (W)w);
673	if (!ev_is_active (w))	1280	if (!ev_is_active (w))
674	return;	1281	return;
675		1282
		1283	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1284
676	if (w->active < timercnt--)	1285	if (((W)w)->active < timercnt--)
677	{	1286	{
678	timers [w->active - 1] = timers [timercnt];	1287	timers [((W)w)->active - 1] = timers [timercnt];
679	downheap ((WT *)timers, timercnt, w->active - 1);	1288	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
680	}	1289	}
681		1290
		1291	((WT)w)->at = w->repeat;
		1292
682	ev_stop ((W)w);	1293	ev_stop (EV_A_ (W)w);
683	}	1294	}
684		1295
685	void	1296	void
686	evperiodic_start (struct ev_periodic *w)	1297	ev_timer_again (EV_P_ struct ev_timer *w)
687	{	1298	{
688	if (ev_is_active (w))	1299	if (ev_is_active (w))
689	return;	1300	{
		1301	if (w->repeat)
		1302	{
		1303	((WT)w)->at = mn_now + w->repeat;
		1304	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1305	}
		1306	else
		1307	ev_timer_stop (EV_A_ w);
		1308	}
		1309	else if (w->repeat)
		1310	ev_timer_start (EV_A_ w);
		1311	}
690		1312
691	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));	1313	void
		1314	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1315	{
		1316	if (ev_is_active (w))
		1317	return;
692		1318
		1319	if (w->reschedule_cb)
		1320	((WT)w)->at = w->reschedule_cb (w, rt_now);
		1321	else if (w->interval)
		1322	{
		1323	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
693	/* this formula differs from the one in periodic_reify because we do not always round up */	1324	/* this formula differs from the one in periodic_reify because we do not always round up */
694	if (w->interval)
695	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;	1325	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1326	}
696		1327
697	ev_start ((W)w, ++periodiccnt);	1328	ev_start (EV_A_ (W)w, ++periodiccnt);
698	array_needsize (periodics, periodicmax, periodiccnt, );	1329	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
699	periodics [periodiccnt - 1] = w;	1330	periodics [periodiccnt - 1] = w;
700	upheap ((WT *)periodics, periodiccnt - 1);	1331	upheap ((WT *)periodics, periodiccnt - 1);
701	}
702		1332
		1333	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1334	}
		1335
703	void	1336	void
704	evperiodic_stop (struct ev_periodic *w)	1337	ev_periodic_stop (EV_P_ struct ev_periodic *w)
705	{	1338	{
		1339	ev_clear_pending (EV_A_ (W)w);
706	if (!ev_is_active (w))	1340	if (!ev_is_active (w))
707	return;	1341	return;
708		1342
		1343	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1344
709	if (w->active < periodiccnt--)	1345	if (((W)w)->active < periodiccnt--)
710	{	1346	{
711	periodics [w->active - 1] = periodics [periodiccnt];	1347	periodics [((W)w)->active - 1] = periodics [periodiccnt];
712	downheap ((WT *)periodics, periodiccnt, w->active - 1);	1348	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
713	}	1349	}
714		1350
715	ev_stop ((W)w);	1351	ev_stop (EV_A_ (W)w);
716	}	1352	}
717		1353
718	void	1354	void
719	evsignal_start (struct ev_signal *w)	1355	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1356	{
		1357	ev_periodic_stop (EV_A_ w);
		1358	ev_periodic_start (EV_A_ w);
		1359	}
		1360
		1361	void
		1362	ev_idle_start (EV_P_ struct ev_idle *w)
720	{	1363	{
721	if (ev_is_active (w))	1364	if (ev_is_active (w))
722	return;	1365	return;
723		1366
		1367	ev_start (EV_A_ (W)w, ++idlecnt);
		1368	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1369	idles [idlecnt - 1] = w;
		1370	}
		1371
		1372	void
		1373	ev_idle_stop (EV_P_ struct ev_idle *w)
		1374	{
		1375	ev_clear_pending (EV_A_ (W)w);
		1376	if (ev_is_active (w))
		1377	return;
		1378
		1379	idles [((W)w)->active - 1] = idles [--idlecnt];
		1380	ev_stop (EV_A_ (W)w);
		1381	}
		1382
		1383	void
		1384	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1385	{
		1386	if (ev_is_active (w))
		1387	return;
		1388
		1389	ev_start (EV_A_ (W)w, ++preparecnt);
		1390	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1391	prepares [preparecnt - 1] = w;
		1392	}
		1393
		1394	void
		1395	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1396	{
		1397	ev_clear_pending (EV_A_ (W)w);
		1398	if (ev_is_active (w))
		1399	return;
		1400
		1401	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1402	ev_stop (EV_A_ (W)w);
		1403	}
		1404
		1405	void
		1406	ev_check_start (EV_P_ struct ev_check *w)
		1407	{
		1408	if (ev_is_active (w))
		1409	return;
		1410
		1411	ev_start (EV_A_ (W)w, ++checkcnt);
		1412	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1413	checks [checkcnt - 1] = w;
		1414	}
		1415
		1416	void
		1417	ev_check_stop (EV_P_ struct ev_check *w)
		1418	{
		1419	ev_clear_pending (EV_A_ (W)w);
		1420	if (ev_is_active (w))
		1421	return;
		1422
		1423	checks [((W)w)->active - 1] = checks [--checkcnt];
		1424	ev_stop (EV_A_ (W)w);
		1425	}
		1426
		1427	#ifndef SA_RESTART
		1428	# define SA_RESTART 0
		1429	#endif
		1430
		1431	void
		1432	ev_signal_start (EV_P_ struct ev_signal *w)
		1433	{
		1434	#if EV_MULTIPLICITY
		1435	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1436	#endif
		1437	if (ev_is_active (w))
		1438	return;
		1439
		1440	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1441
724	ev_start ((W)w, 1);	1442	ev_start (EV_A_ (W)w, 1);
725	array_needsize (signals, signalmax, w->signum, signals_init);	1443	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
726	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1444	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
727		1445
728	if (!w->next)	1446	if (!((WL)w)->next)
729	{	1447	{
		1448	#if WIN32
		1449	signal (w->signum, sighandler);
		1450	#else
730	struct sigaction sa;	1451	struct sigaction sa;
731	sa.sa_handler = sighandler;	1452	sa.sa_handler = sighandler;
732	sigfillset (&sa.sa_mask);	1453	sigfillset (&sa.sa_mask);
733	sa.sa_flags = 0;	1454	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
734	sigaction (w->signum, &sa, 0);	1455	sigaction (w->signum, &sa, 0);
		1456	#endif
735	}	1457	}
736	}	1458	}
737		1459
738	void	1460	void
739	evsignal_stop (struct ev_signal *w)	1461	ev_signal_stop (EV_P_ struct ev_signal *w)
740	{	1462	{
		1463	ev_clear_pending (EV_A_ (W)w);
741	if (!ev_is_active (w))	1464	if (!ev_is_active (w))
742	return;	1465	return;
743		1466
744	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1467	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
745	ev_stop ((W)w);	1468	ev_stop (EV_A_ (W)w);
746		1469
747	if (!signals [w->signum - 1].head)	1470	if (!signals [w->signum - 1].head)
748	signal (w->signum, SIG_DFL);	1471	signal (w->signum, SIG_DFL);
749	}	1472	}
750		1473
751	void evidle_start (struct ev_idle *w)	1474	void
		1475	ev_child_start (EV_P_ struct ev_child *w)
752	{	1476	{
		1477	#if EV_MULTIPLICITY
		1478	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1479	#endif
753	if (ev_is_active (w))	1480	if (ev_is_active (w))
754	return;	1481	return;
755		1482
756	ev_start ((W)w, ++idlecnt);	1483	ev_start (EV_A_ (W)w, 1);
757	array_needsize (idles, idlemax, idlecnt, );	1484	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
758	idles [idlecnt - 1] = w;
759	}	1485	}
760		1486
761	void evidle_stop (struct ev_idle *w)	1487	void
		1488	ev_child_stop (EV_P_ struct ev_child *w)
762	{	1489	{
763	idles [w->active - 1] = idles [--idlecnt];	1490	ev_clear_pending (EV_A_ (W)w);
764	ev_stop ((W)w);
765	}
766
767	void evcheck_start (struct ev_check *w)
768	{
769	if (ev_is_active (w))	1491	if (ev_is_active (w))
770	return;	1492	return;
771		1493
772	ev_start ((W)w, ++checkcnt);	1494	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
773	array_needsize (checks, checkmax, checkcnt, );
774	checks [checkcnt - 1] = w;
775	}
776
777	void evcheck_stop (struct ev_check *w)
778	{
779	checks [w->active - 1] = checks [--checkcnt];
780	ev_stop ((W)w);	1495	ev_stop (EV_A_ (W)w);
781	}	1496	}
782		1497
783	/*****************************************************************************/	1498	/*****************************************************************************/
784		1499
785	#if 0	1500	struct ev_once
786		1501	{
787	struct ev_io wio;	1502	struct ev_io io;
788
789	static void
790	sin_cb (struct ev_io *w, int revents)
791	{
792	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
793	}
794
795	static void
796	ocb (struct ev_timer *w, int revents)
797	{
798	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
799	evtimer_stop (w);
800	evtimer_start (w);
801	}
802
803	static void
804	scb (struct ev_signal *w, int revents)
805	{
806	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
807	evio_stop (&wio);
808	evio_start (&wio);
809	}
810
811	static void
812	gcb (struct ev_signal *w, int revents)
813	{
814	fprintf (stderr, "generic %x\n", revents);
815
816	}
817
818	int main (void)
819	{
820	ev_init (0);
821
822	evio_init (&wio, sin_cb, 0, EV_READ);
823	evio_start (&wio);
824
825	struct ev_timer t[10000];
826
827	#if 0
828	int i;
829	for (i = 0; i < 10000; ++i)
830	{
831	struct ev_timer *w = t + i;
832	evw_init (w, ocb, i);
833	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
834	evtimer_start (w);
835	if (drand48 () < 0.5)
836	evtimer_stop (w);
837	}
838	#endif
839
840	struct ev_timer t1;	1503	struct ev_timer to;
841	evtimer_init (&t1, ocb, 5, 10);	1504	void (cb)(int revents, void arg);
842	evtimer_start (&t1);	1505	void *arg;
		1506	};
843		1507
844	struct ev_signal sig;	1508	static void
845	evsignal_init (&sig, scb, SIGQUIT);	1509	once_cb (EV_P_ struct ev_once *once, int revents)
846	evsignal_start (&sig);	1510	{
		1511	void (cb)(int revents, void arg) = once->cb;
		1512	void *arg = once->arg;
847		1513
848	struct ev_check cw;	1514	ev_io_stop (EV_A_ &once->io);
849	evcheck_init (&cw, gcb);	1515	ev_timer_stop (EV_A_ &once->to);
850	evcheck_start (&cw);	1516	ev_free (once);
851		1517
852	struct ev_idle iw;	1518	cb (revents, arg);
853	evidle_init (&iw, gcb);
854	evidle_start (&iw);
855
856	ev_loop (0);
857
858	return 0;
859	}	1519	}
860		1520
861	#endif	1521	static void
		1522	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1523	{
		1524	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1525	}
862		1526
		1527	static void
		1528	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1529	{
		1530	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1531	}
863		1532
		1533	void
		1534	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1535	{
		1536	struct ev_once once = (struct ev_once )ev_malloc (sizeof (struct ev_once));
864		1537
		1538	if (!once)
		1539	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1540	else
		1541	{
		1542	once->cb = cb;
		1543	once->arg = arg;
865		1544
		1545	ev_watcher_init (&once->io, once_cb_io);
		1546	if (fd >= 0)
		1547	{
		1548	ev_io_set (&once->io, fd, events);
		1549	ev_io_start (EV_A_ &once->io);
		1550	}
		1551
		1552	ev_watcher_init (&once->to, once_cb_to);
		1553	if (timeout >= 0.)
		1554	{
		1555	ev_timer_set (&once->to, timeout, 0.);
		1556	ev_timer_start (EV_A_ &once->to);
		1557	}
		1558	}
		1559	}
		1560

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Comparing libev/ev.c (file contents): Revision 1.13 by root, Wed Oct 31 10:50:05 2007 UTC vs. Revision 1.78 by root, Thu Nov 8 21:08:56 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.13 by root, Wed Oct 31 10:50:05 2007 UTC vs.
Revision 1.78 by root, Thu Nov 8 21:08:56 2007 UTC