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

Comparing libev/ev.c (file contents):
Revision 1.15 by root, Wed Oct 31 11:56:34 2007 UTC vs.
Revision 1.97 by root, Sun Nov 11 01:53:07 2007 UTC

…		…
		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# include "config.h"
		38
		39	# if HAVE_CLOCK_GETTIME
		40	# ifndef EV_USE_MONOTONIC
		41	# define EV_USE_MONOTONIC 1
		42	# endif
		43	# ifndef EV_USE_REALTIME
		44	# define EV_USE_REALTIME 1
		45	# endif
		46	# endif
		47
		48	# if HAVE_SELECT && HAVE_SYS_SELECT_H && !defined (EV_USE_SELECT)
		49	# define EV_USE_SELECT 1
		50	# endif
		51
		52	# if HAVE_POLL && HAVE_POLL_H && !defined (EV_USE_POLL)
		53	# define EV_USE_POLL 1
		54	# endif
		55
		56	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H && !defined (EV_USE_EPOLL)
		57	# define EV_USE_EPOLL 1
		58	# endif
		59
		60	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H && !defined (EV_USE_KQUEUE)
		61	# define EV_USE_KQUEUE 1
		62	# endif
		63
		64	#endif
		65
1	#include <math.h>	66	#include <math.h>
2	#include <stdlib.h>	67	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	68	#include <fcntl.h>
5	#include <signal.h>	69	#include <stddef.h>
6		70
7	#include <stdio.h>	71	#include <stdio.h>
8		72
9	#include <assert.h>	73	#include <assert.h>
10	#include <errno.h>	74	#include <errno.h>
11	#include <sys/time.h>	75	#include <sys/types.h>
12	#include <time.h>	76	#include <time.h>
13		77
14	#define HAVE_EPOLL 1	78	#include <signal.h>
15		79
		80	#ifndef WIN32
		81	# include <unistd.h>
		82	# include <sys/time.h>
		83	# include <sys/wait.h>
		84	#endif
		85	/**/
		86
16	#ifndef HAVE_MONOTONIC	87	#ifndef EV_USE_MONOTONIC
17	# ifdef CLOCK_MONOTONIC
18	# define HAVE_MONOTONIC 1	88	# define EV_USE_MONOTONIC 1
		89	#endif
		90
		91	#ifndef EV_USE_SELECT
		92	# define EV_USE_SELECT 1
		93	#endif
		94
		95	#ifndef EV_USE_POLL
		96	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		97	#endif
		98
		99	#ifndef EV_USE_EPOLL
		100	# define EV_USE_EPOLL 0
		101	#endif
		102
		103	#ifndef EV_USE_KQUEUE
		104	# define EV_USE_KQUEUE 0
		105	#endif
		106
		107	#ifndef EV_USE_WIN32
		108	# ifdef WIN32
		109	# define EV_USE_WIN32 0 /* it does not exist, use select */
		110	# undef EV_USE_SELECT
		111	# define EV_USE_SELECT 1
		112	# else
		113	# define EV_USE_WIN32 0
19	# endif	114	# endif
20	#endif	115	#endif
21		116
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	117	#ifndef EV_USE_REALTIME
31	# define HAVE_REALTIME 1 /* posix requirement, but might be slower */	118	# define EV_USE_REALTIME 1
32	#endif	119	#endif
		120
		121	/**/
		122
		123	#ifndef CLOCK_MONOTONIC
		124	# undef EV_USE_MONOTONIC
		125	# define EV_USE_MONOTONIC 0
		126	#endif
		127
		128	#ifndef CLOCK_REALTIME
		129	# undef EV_USE_REALTIME
		130	# define EV_USE_REALTIME 0
		131	#endif
		132
		133	/**/
33		134
34	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	135	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
35	#define MAX_BLOCKTIME 60.	136	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		137	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		138	/#define CLEANUP_INTERVAL 300. / how often to try to free memory and re-check fds */
36		139
		140	#ifdef EV_H
		141	# include EV_H
		142	#else
37	#include "ev.h"	143	# include "ev.h"
		144	#endif
		145
		146	#if __GNUC__ >= 3
		147	# define expect(expr,value) __builtin_expect ((expr),(value))
		148	# define inline inline
		149	#else
		150	# define expect(expr,value) (expr)
		151	# define inline static
		152	#endif
		153
		154	#define expect_false(expr) expect ((expr) != 0, 0)
		155	#define expect_true(expr) expect ((expr) != 0, 1)
		156
		157	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		158	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
38		159
39	typedef struct ev_watcher *W;	160	typedef struct ev_watcher *W;
40	typedef struct ev_watcher_list *WL;	161	typedef struct ev_watcher_list *WL;
41	typedef struct ev_watcher_time *WT;	162	typedef struct ev_watcher_time *WT;
42		163
43	static ev_tstamp now, diff; /* monotonic clock */	164	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		165
		166	#include "ev_win32.c"
		167
		168	/*****************************************************************************/
		169
		170	static void (syserr_cb)(const char msg);
		171
		172	void ev_set_syserr_cb (void (cb)(const char msg))
		173	{
		174	syserr_cb = cb;
		175	}
		176
		177	static void
		178	syserr (const char *msg)
		179	{
		180	if (!msg)
		181	msg = "(libev) system error";
		182
		183	if (syserr_cb)
		184	syserr_cb (msg);
		185	else
		186	{
		187	perror (msg);
		188	abort ();
		189	}
		190	}
		191
		192	static void (alloc)(void *ptr, long size);
		193
		194	void ev_set_allocator (void (cb)(void *ptr, long size))
		195	{
		196	alloc = cb;
		197	}
		198
		199	static void *
		200	ev_realloc (void *ptr, long size)
		201	{
		202	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		203
		204	if (!ptr && size)
		205	{
		206	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		207	abort ();
		208	}
		209
		210	return ptr;
		211	}
		212
		213	#define ev_malloc(size) ev_realloc (0, (size))
		214	#define ev_free(ptr) ev_realloc ((ptr), 0)
		215
		216	/*****************************************************************************/
		217
		218	typedef struct
		219	{
		220	WL head;
		221	unsigned char events;
		222	unsigned char reify;
		223	} ANFD;
		224
		225	typedef struct
		226	{
		227	W w;
		228	int events;
		229	} ANPENDING;
		230
		231	#if EV_MULTIPLICITY
		232
		233	struct ev_loop
		234	{
		235	ev_tstamp ev_rt_now;
		236	#define VAR(name,decl) decl;
		237	#include "ev_vars.h"
		238	#undef VAR
		239	};
		240	#include "ev_wrap.h"
		241
		242	struct ev_loop default_loop_struct;
		243	static struct ev_loop *default_loop;
		244
		245	#else
		246
44	ev_tstamp ev_now;	247	ev_tstamp ev_rt_now;
45	int ev_method;	248	#define VAR(name,decl) static decl;
		249	#include "ev_vars.h"
		250	#undef VAR
46		251
47	static int have_monotonic; /* runtime */	252	static int default_loop;
48		253
49	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	254	#endif
50	static void (*method_modify)(int fd, int oev, int nev);
51	static void (*method_poll)(ev_tstamp timeout);
52		255
53	/*****************************************************************************/	256	/*****************************************************************************/
54		257
55	ev_tstamp	258	ev_tstamp
56	ev_time (void)	259	ev_time (void)
57	{	260	{
58	#if HAVE_REALTIME	261	#if EV_USE_REALTIME
59	struct timespec ts;	262	struct timespec ts;
60	clock_gettime (CLOCK_REALTIME, &ts);	263	clock_gettime (CLOCK_REALTIME, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	264	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	#else	265	#else
63	struct timeval tv;	266	struct timeval tv;
64	gettimeofday (&tv, 0);	267	gettimeofday (&tv, 0);
65	return tv.tv_sec + tv.tv_usec * 1e-6;	268	return tv.tv_sec + tv.tv_usec * 1e-6;
66	#endif	269	#endif
67	}	270	}
68		271
69	static ev_tstamp	272	inline ev_tstamp
70	get_clock (void)	273	get_clock (void)
71	{	274	{
72	#if HAVE_MONOTONIC	275	#if EV_USE_MONOTONIC
73	if (have_monotonic)	276	if (expect_true (have_monotonic))
74	{	277	{
75	struct timespec ts;	278	struct timespec ts;
76	clock_gettime (CLOCK_MONOTONIC, &ts);	279	clock_gettime (CLOCK_MONOTONIC, &ts);
77	return ts.tv_sec + ts.tv_nsec * 1e-9;	280	return ts.tv_sec + ts.tv_nsec * 1e-9;
78	}	281	}
79	#endif	282	#endif
80		283
81	return ev_time ();	284	return ev_time ();
82	}	285	}
83		286
		287	#if EV_MULTIPLICITY
		288	ev_tstamp
		289	ev_now (EV_P)
		290	{
		291	return ev_rt_now;
		292	}
		293	#endif
		294
		295	#define array_roundsize(type,n) ((n) \| 4 & ~3)
		296
84	#define array_needsize(base,cur,cnt,init) \	297	#define array_needsize(type,base,cur,cnt,init) \
85	if ((cnt) > cur) \	298	if (expect_false ((cnt) > cur)) \
86	{ \	299	{ \
87	int newcnt = cur ? cur << 1 : 16; \	300	int newcnt = cur; \
		301	do \
		302	{ \
		303	newcnt = array_roundsize (type, newcnt << 1); \
		304	} \
		305	while ((cnt) > newcnt); \
		306	\
88	base = realloc (base, sizeof (base) (newcnt)); \	307	base = (type )ev_realloc (base, sizeof (type) (newcnt));\
89	init (base + cur, newcnt - cur); \	308	init (base + cur, newcnt - cur); \
90	cur = newcnt; \	309	cur = newcnt; \
91	}	310	}
		311
		312	#define array_slim(type,stem) \
		313	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		314	{ \
		315	stem ## max = array_roundsize (stem ## cnt >> 1); \
		316	base = (type )ev_realloc (base, sizeof (type) (stem ## max));\
		317	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/D/\
		318	}
		319
		320	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
		321	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		322	#define array_free_microshit(stem) \
		323	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
		324
		325	#define array_free(stem, idx) \
		326	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
92		327
93	/*****************************************************************************/	328	/*****************************************************************************/
94		329
95	typedef struct
96	{
97	struct ev_io *head;
98	unsigned char wev, rev; /* want, received event set */
99	} ANFD;
100
101	static ANFD *anfds;
102	static int anfdmax;
103
104	static int *fdchanges;
105	static int fdchangemax, fdchangecnt;
106
107	static void	330	static void
108	anfds_init (ANFD *base, int count)	331	anfds_init (ANFD *base, int count)
109	{	332	{
110	while (count--)	333	while (count--)
111	{	334	{
112	base->head = 0;	335	base->head = 0;
113	base->wev = base->rev = EV_NONE;	336	base->events = EV_NONE;
		337	base->reify = 0;
		338
114	++base;	339	++base;
115	}	340	}
116	}	341	}
117		342
118	typedef struct	343	void
		344	ev_feed_event (EV_P_ void *w, int revents)
119	{	345	{
120	W w;	346	W w_ = (W)w;
121	int events;
122	} ANPENDING;
123		347
124	static ANPENDING *pendings;	348	if (w_->pending)
125	static int pendingmax, pendingcnt;	349	{
		350	pendings [ABSPRI (w_)][w_->pending - 1].events \|= revents;
		351	return;
		352	}
126		353
127	static void
128	event (W w, int events)
129	{
130	w->pending = ++pendingcnt;	354	w_->pending = ++pendingcnt [ABSPRI (w_)];
131	array_needsize (pendings, pendingmax, pendingcnt, );	355	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
132	pendings [pendingcnt - 1].w = w;	356	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
133	pendings [pendingcnt - 1].events = events;	357	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
134	}	358	}
135		359
136	static void	360	static void
		361	queue_events (EV_P_ W *events, int eventcnt, int type)
		362	{
		363	int i;
		364
		365	for (i = 0; i < eventcnt; ++i)
		366	ev_feed_event (EV_A_ events [i], type);
		367	}
		368
		369	inline void
137	fd_event (int fd, int events)	370	fd_event (EV_P_ int fd, int revents)
138	{	371	{
139	ANFD *anfd = anfds + fd;	372	ANFD *anfd = anfds + fd;
140	struct ev_io *w;	373	struct ev_io *w;
141		374
142	for (w = anfd->head; w; w = w->next)	375	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
143	{	376	{
144	int ev = w->events & events;	377	int ev = w->events & revents;
145		378
146	if (ev)	379	if (ev)
147	event ((W)w, ev);	380	ev_feed_event (EV_A_ (W)w, ev);
148	}	381	}
149	}	382	}
150		383
		384	void
		385	ev_feed_fd_event (EV_P_ int fd, int revents)
		386	{
		387	fd_event (EV_A_ fd, revents);
		388	}
		389
		390	/*****************************************************************************/
		391
151	static void	392	static void
152	queue_events (W *events, int eventcnt, int type)	393	fd_reify (EV_P)
153	{	394	{
154	int i;	395	int i;
155		396
156	for (i = 0; i < eventcnt; ++i)	397	for (i = 0; i < fdchangecnt; ++i)
157	event (events [i], type);	398	{
		399	int fd = fdchanges [i];
		400	ANFD *anfd = anfds + fd;
		401	struct ev_io *w;
		402
		403	int events = 0;
		404
		405	for (w = (struct ev_io )anfd->head; w; w = (struct ev_io )((WL)w)->next)
		406	events \|= w->events;
		407
		408	anfd->reify = 0;
		409
		410	method_modify (EV_A_ fd, anfd->events, events);
		411	anfd->events = events;
		412	}
		413
		414	fdchangecnt = 0;
		415	}
		416
		417	static void
		418	fd_change (EV_P_ int fd)
		419	{
		420	if (anfds [fd].reify)
		421	return;
		422
		423	anfds [fd].reify = 1;
		424
		425	++fdchangecnt;
		426	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		427	fdchanges [fdchangecnt - 1] = fd;
		428	}
		429
		430	static void
		431	fd_kill (EV_P_ int fd)
		432	{
		433	struct ev_io *w;
		434
		435	while ((w = (struct ev_io *)anfds [fd].head))
		436	{
		437	ev_io_stop (EV_A_ w);
		438	ev_feed_event (EV_A_ (W)w, EV_ERROR \| EV_READ \| EV_WRITE);
		439	}
		440	}
		441
		442	static int
		443	fd_valid (int fd)
		444	{
		445	#ifdef WIN32
		446	return !!win32_get_osfhandle (fd);
		447	#else
		448	return fcntl (fd, F_GETFD) != -1;
		449	#endif
		450	}
		451
		452	/* called on EBADF to verify fds */
		453	static void
		454	fd_ebadf (EV_P)
		455	{
		456	int fd;
		457
		458	for (fd = 0; fd < anfdmax; ++fd)
		459	if (anfds [fd].events)
		460	if (!fd_valid (fd) == -1 && errno == EBADF)
		461	fd_kill (EV_A_ fd);
		462	}
		463
		464	/* called on ENOMEM in select/poll to kill some fds and retry */
		465	static void
		466	fd_enomem (EV_P)
		467	{
		468	int fd;
		469
		470	for (fd = anfdmax; fd--; )
		471	if (anfds [fd].events)
		472	{
		473	fd_kill (EV_A_ fd);
		474	return;
		475	}
		476	}
		477
		478	/* usually called after fork if method needs to re-arm all fds from scratch */
		479	static void
		480	fd_rearm_all (EV_P)
		481	{
		482	int fd;
		483
		484	/* this should be highly optimised to not do anything but set a flag */
		485	for (fd = 0; fd < anfdmax; ++fd)
		486	if (anfds [fd].events)
		487	{
		488	anfds [fd].events = 0;
		489	fd_change (EV_A_ fd);
		490	}
158	}	491	}
159		492
160	/*****************************************************************************/	493	/*****************************************************************************/
161		494
162	static struct ev_timer **timers;
163	static int timermax, timercnt;
164
165	static struct ev_periodic **periodics;
166	static int periodicmax, periodiccnt;
167
168	static void	495	static void
169	upheap (WT *timers, int k)	496	upheap (WT *heap, int k)
170	{	497	{
171	WT w = timers [k];	498	WT w = heap [k];
172		499
173	while (k && timers [k >> 1]->at > w->at)	500	while (k && heap [k >> 1]->at > w->at)
174	{	501	{
175	timers [k] = timers [k >> 1];	502	heap [k] = heap [k >> 1];
176	timers [k]->active = k + 1;	503	((W)heap [k])->active = k + 1;
177	k >>= 1;	504	k >>= 1;
178	}	505	}
179		506
180	timers [k] = w;	507	heap [k] = w;
181	timers [k]->active = k + 1;	508	((W)heap [k])->active = k + 1;
182		509
183	}	510	}
184		511
185	static void	512	static void
186	downheap (WT *timers, int N, int k)	513	downheap (WT *heap, int N, int k)
187	{	514	{
188	WT w = timers [k];	515	WT w = heap [k];
189		516
190	while (k < (N >> 1))	517	while (k < (N >> 1))
191	{	518	{
192	int j = k << 1;	519	int j = k << 1;
193		520
194	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	521	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
195	++j;	522	++j;
196		523
197	if (w->at <= timers [j]->at)	524	if (w->at <= heap [j]->at)
198	break;	525	break;
199		526
200	timers [k] = timers [j];	527	heap [k] = heap [j];
201	timers [k]->active = k + 1;	528	((W)heap [k])->active = k + 1;
202	k = j;	529	k = j;
203	}	530	}
204		531
205	timers [k] = w;	532	heap [k] = w;
206	timers [k]->active = k + 1;	533	((W)heap [k])->active = k + 1;
		534	}
		535
		536	inline void
		537	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		538	{
		539	ev_tstamp old_at = heap [k]->at;
		540	heap [k]->at = at;
		541
		542	if (old_at < at)
		543	downheap (heap, N, k);
		544	else
		545	upheap (heap, k);
207	}	546	}
208		547
209	/*****************************************************************************/	548	/*****************************************************************************/
210		549
211	typedef struct	550	typedef struct
212	{	551	{
213	struct ev_signal *head;	552	WL head;
214	sig_atomic_t gotsig;	553	sig_atomic_t volatile gotsig;
215	} ANSIG;	554	} ANSIG;
216		555
217	static ANSIG *signals;	556	static ANSIG *signals;
218	static int signalmax;	557	static int signalmax;
219		558
220	static int sigpipe [2];	559	static int sigpipe [2];
221	static sig_atomic_t gotsig;	560	static sig_atomic_t volatile gotsig;
222	static struct ev_io sigev;	561	static struct ev_io sigev;
223		562
224	static void	563	static void
225	signals_init (ANSIG *base, int count)	564	signals_init (ANSIG *base, int count)
226	{	565	{
227	while (count--)	566	while (count--)
228	{	567	{
229	base->head = 0;	568	base->head = 0;
230	base->gotsig = 0;	569	base->gotsig = 0;
		570
231	++base;	571	++base;
232	}	572	}
233	}	573	}
234		574
235	static void	575	static void
236	sighandler (int signum)	576	sighandler (int signum)
237	{	577	{
		578	#if WIN32
		579	signal (signum, sighandler);
		580	#endif
		581
238	signals [signum - 1].gotsig = 1;	582	signals [signum - 1].gotsig = 1;
239		583
240	if (!gotsig)	584	if (!gotsig)
241	{	585	{
		586	int old_errno = errno;
242	gotsig = 1;	587	gotsig = 1;
		588	#ifdef WIN32
		589	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		590	#else
243	write (sigpipe [1], &gotsig, 1);	591	write (sigpipe [1], &signum, 1);
		592	#endif
		593	errno = old_errno;
244	}	594	}
245	}	595	}
246		596
		597	void
		598	ev_feed_signal_event (EV_P_ int signum)
		599	{
		600	WL w;
		601
		602	#if EV_MULTIPLICITY
		603	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		604	#endif
		605
		606	--signum;
		607
		608	if (signum < 0 \|\| signum >= signalmax)
		609	return;
		610
		611	signals [signum].gotsig = 0;
		612
		613	for (w = signals [signum].head; w; w = w->next)
		614	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		615	}
		616
247	static void	617	static void
248	sigcb (struct ev_io *iow, int revents)	618	sigcb (EV_P_ struct ev_io *iow, int revents)
249	{	619	{
250	struct ev_signal *w;
251	int sig;	620	int signum;
252		621
		622	#ifdef WIN32
		623	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		624	#else
		625	read (sigpipe [0], &revents, 1);
		626	#endif
253	gotsig = 0;	627	gotsig = 0;
254	read (sigpipe [0], &revents, 1);
255		628
256	for (sig = signalmax; sig--; )	629	for (signum = signalmax; signum--; )
257	if (signals [sig].gotsig)	630	if (signals [signum].gotsig)
258	{	631	ev_feed_signal_event (EV_A_ signum + 1);
259	signals [sig].gotsig = 0;
260
261	for (w = signals [sig].head; w; w = w->next)
262	event ((W)w, EV_SIGNAL);
263	}
264	}	632	}
265		633
266	static void	634	static void
267	siginit (void)	635	siginit (EV_P)
268	{	636	{
		637	#ifndef WIN32
269	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	638	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
270	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	639	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
271		640
272	/* rather than sort out wether we really need nb, set it */	641	/* rather than sort out wether we really need nb, set it */
273	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	642	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
274	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	643	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		644	#endif
275		645
276	evio_set (&sigev, sigpipe [0], EV_READ);	646	ev_io_set (&sigev, sigpipe [0], EV_READ);
277	evio_start (&sigev);	647	ev_io_start (EV_A_ &sigev);
		648	ev_unref (EV_A); /* child watcher should not keep loop alive */
278	}	649	}
279		650
280	/*****************************************************************************/	651	/*****************************************************************************/
281		652
282	static struct ev_idle **idles;	653	static struct ev_child *childs [PID_HASHSIZE];
283	static int idlemax, idlecnt;
284		654
285	static struct ev_check **checks;	655	#ifndef WIN32
286	static int checkmax, checkcnt;	656
		657	static struct ev_signal childev;
		658
		659	#ifndef WCONTINUED
		660	# define WCONTINUED 0
		661	#endif
		662
		663	static void
		664	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		665	{
		666	struct ev_child *w;
		667
		668	for (w = (struct ev_child )childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child )((WL)w)->next)
		669	if (w->pid == pid \|\| !w->pid)
		670	{
		671	ev_priority (w) = ev_priority (sw); /* need to do it now */
		672	w->rpid = pid;
		673	w->rstatus = status;
		674	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		675	}
		676	}
		677
		678	static void
		679	childcb (EV_P_ struct ev_signal *sw, int revents)
		680	{
		681	int pid, status;
		682
		683	if (0 < (pid = waitpid (-1, &status, WNOHANG \| WUNTRACED \| WCONTINUED)))
		684	{
		685	/* make sure we are called again until all childs have been reaped */
		686	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		687
		688	child_reap (EV_A_ sw, pid, pid, status);
		689	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		690	}
		691	}
		692
		693	#endif
287		694
288	/*****************************************************************************/	695	/*****************************************************************************/
289		696
		697	#if EV_USE_KQUEUE
		698	# include "ev_kqueue.c"
		699	#endif
290	#if HAVE_EPOLL	700	#if EV_USE_EPOLL
291	# include "ev_epoll.c"	701	# include "ev_epoll.c"
292	#endif	702	#endif
		703	#if EV_USE_POLL
		704	# include "ev_poll.c"
		705	#endif
293	#if HAVE_SELECT	706	#if EV_USE_SELECT
294	# include "ev_select.c"	707	# include "ev_select.c"
295	#endif	708	#endif
296		709
297	int ev_init (int flags)	710	int
		711	ev_version_major (void)
298	{	712	{
		713	return EV_VERSION_MAJOR;
		714	}
		715
		716	int
		717	ev_version_minor (void)
		718	{
		719	return EV_VERSION_MINOR;
		720	}
		721
		722	/* return true if we are running with elevated privileges and should ignore env variables */
		723	static int
		724	enable_secure (void)
		725	{
		726	#ifdef WIN32
		727	return 0;
		728	#else
		729	return getuid () != geteuid ()
		730	\|\| getgid () != getegid ();
		731	#endif
		732	}
		733
		734	int
		735	ev_method (EV_P)
		736	{
		737	return method;
		738	}
		739
		740	static void
		741	loop_init (EV_P_ int methods)
		742	{
		743	if (!method)
		744	{
299	#if HAVE_MONOTONIC	745	#if EV_USE_MONOTONIC
300	{	746	{
301	struct timespec ts;	747	struct timespec ts;
302	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	748	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
303	have_monotonic = 1;	749	have_monotonic = 1;
304	}	750	}
305	#endif	751	#endif
306		752
307	ev_now = ev_time ();	753	ev_rt_now = ev_time ();
308	now = get_clock ();	754	mn_now = get_clock ();
309	diff = ev_now - now;	755	now_floor = mn_now;
		756	rtmn_diff = ev_rt_now - mn_now;
310		757
311	if (pipe (sigpipe))	758	if (methods == EVMETHOD_AUTO)
312	return 0;	759	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		760	methods = atoi (getenv ("LIBEV_METHODS"));
		761	else
		762	methods = EVMETHOD_ANY;
313		763
314	ev_method = EVMETHOD_NONE;	764	method = 0;
		765	#if EV_USE_WIN32
		766	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		767	#endif
		768	#if EV_USE_KQUEUE
		769	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		770	#endif
315	#if HAVE_EPOLL	771	#if EV_USE_EPOLL
316	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	772	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
317	#endif	773	#endif
		774	#if EV_USE_POLL
		775	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		776	#endif
318	#if HAVE_SELECT	777	#if EV_USE_SELECT
319	if (ev_method == EVMETHOD_NONE) select_init (flags);	778	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
320	#endif	779	#endif
321		780
322	if (ev_method)
323	{
324	evw_init (&sigev, sigcb);	781	ev_init (&sigev, sigcb);
		782	ev_set_priority (&sigev, EV_MAXPRI);
		783	}
		784	}
		785
		786	void
		787	loop_destroy (EV_P)
		788	{
		789	int i;
		790
		791	#if EV_USE_WIN32
		792	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		793	#endif
		794	#if EV_USE_KQUEUE
		795	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		796	#endif
		797	#if EV_USE_EPOLL
		798	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		799	#endif
		800	#if EV_USE_POLL
		801	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		802	#endif
		803	#if EV_USE_SELECT
		804	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		805	#endif
		806
		807	for (i = NUMPRI; i--; )
		808	array_free (pending, [i]);
		809
		810	/* have to use the microsoft-never-gets-it-right macro */
		811	array_free_microshit (fdchange);
		812	array_free_microshit (timer);
		813	#if EV_PERIODICS
		814	array_free_microshit (periodic);
		815	#endif
		816	array_free_microshit (idle);
		817	array_free_microshit (prepare);
		818	array_free_microshit (check);
		819
		820	method = 0;
		821	}
		822
		823	static void
		824	loop_fork (EV_P)
		825	{
		826	#if EV_USE_EPOLL
		827	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		828	#endif
		829	#if EV_USE_KQUEUE
		830	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		831	#endif
		832
		833	if (ev_is_active (&sigev))
		834	{
		835	/* default loop */
		836
		837	ev_ref (EV_A);
		838	ev_io_stop (EV_A_ &sigev);
		839	close (sigpipe [0]);
		840	close (sigpipe [1]);
		841
		842	while (pipe (sigpipe))
		843	syserr ("(libev) error creating pipe");
		844
325	siginit ();	845	siginit (EV_A);
		846	}
		847
		848	postfork = 0;
		849	}
		850
		851	#if EV_MULTIPLICITY
		852	struct ev_loop *
		853	ev_loop_new (int methods)
		854	{
		855	struct ev_loop loop = (struct ev_loop )ev_malloc (sizeof (struct ev_loop));
		856
		857	memset (loop, 0, sizeof (struct ev_loop));
		858
		859	loop_init (EV_A_ methods);
		860
		861	if (ev_method (EV_A))
		862	return loop;
		863
		864	return 0;
		865	}
		866
		867	void
		868	ev_loop_destroy (EV_P)
		869	{
		870	loop_destroy (EV_A);
		871	ev_free (loop);
		872	}
		873
		874	void
		875	ev_loop_fork (EV_P)
		876	{
		877	postfork = 1;
		878	}
		879
		880	#endif
		881
		882	#if EV_MULTIPLICITY
		883	struct ev_loop *
		884	#else
		885	int
		886	#endif
		887	ev_default_loop (int methods)
		888	{
		889	if (sigpipe [0] == sigpipe [1])
		890	if (pipe (sigpipe))
		891	return 0;
		892
		893	if (!default_loop)
326	}	894	{
		895	#if EV_MULTIPLICITY
		896	struct ev_loop *loop = default_loop = &default_loop_struct;
		897	#else
		898	default_loop = 1;
		899	#endif
327		900
328	return ev_method;	901	loop_init (EV_A_ methods);
		902
		903	if (ev_method (EV_A))
		904	{
		905	siginit (EV_A);
		906
		907	#ifndef WIN32
		908	ev_signal_init (&childev, childcb, SIGCHLD);
		909	ev_set_priority (&childev, EV_MAXPRI);
		910	ev_signal_start (EV_A_ &childev);
		911	ev_unref (EV_A); /* child watcher should not keep loop alive */
		912	#endif
		913	}
		914	else
		915	default_loop = 0;
		916	}
		917
		918	return default_loop;
		919	}
		920
		921	void
		922	ev_default_destroy (void)
		923	{
		924	#if EV_MULTIPLICITY
		925	struct ev_loop *loop = default_loop;
		926	#endif
		927
		928	#ifndef WIN32
		929	ev_ref (EV_A); /* child watcher */
		930	ev_signal_stop (EV_A_ &childev);
		931	#endif
		932
		933	ev_ref (EV_A); /* signal watcher */
		934	ev_io_stop (EV_A_ &sigev);
		935
		936	close (sigpipe [0]); sigpipe [0] = 0;
		937	close (sigpipe [1]); sigpipe [1] = 0;
		938
		939	loop_destroy (EV_A);
		940	}
		941
		942	void
		943	ev_default_fork (void)
		944	{
		945	#if EV_MULTIPLICITY
		946	struct ev_loop *loop = default_loop;
		947	#endif
		948
		949	if (method)
		950	postfork = 1;
329	}	951	}
330		952
331	/*****************************************************************************/	953	/*****************************************************************************/
332		954
333	void ev_prefork (void)
334	{
335	/* nop */
336	}
337
338	void ev_postfork_parent (void)
339	{
340	/* nop */
341	}
342
343	void ev_postfork_child (void)
344	{
345	#if HAVE_EPOLL
346	if (ev_method == EVMETHOD_EPOLL)
347	epoll_postfork_child ();
348	#endif
349
350	evio_stop (&sigev);
351	close (sigpipe [0]);
352	close (sigpipe [1]);
353	pipe (sigpipe);
354	siginit ();
355	}
356
357	/*****************************************************************************/
358
359	static void	955	static int
360	fd_reify (void)	956	any_pending (EV_P)
361	{	957	{
362	int i;	958	int pri;
363		959
364	for (i = 0; i < fdchangecnt; ++i)	960	for (pri = NUMPRI; pri--; )
365	{	961	if (pendingcnt [pri])
366	int fd = fdchanges [i];	962	return 1;
367	ANFD *anfd = anfds + fd;
368	struct ev_io *w;
369		963
370	int wev = 0;	964	return 0;
371
372	for (w = anfd->head; w; w = w->next)
373	wev \|= w->events;
374
375	if (anfd->wev != wev)
376	{
377	method_modify (fd, anfd->wev, wev);
378	anfd->wev = wev;
379	}
380	}
381
382	fdchangecnt = 0;
383	}	965	}
384		966
385	static void	967	static void
386	call_pending ()	968	call_pending (EV_P)
387	{	969	{
388	int i;	970	int pri;
389		971
390	for (i = 0; i < pendingcnt; ++i)	972	for (pri = NUMPRI; pri--; )
		973	while (pendingcnt [pri])
391	{	974	{
392	ANPENDING *p = pendings + i;	975	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
393		976
394	if (p->w)	977	if (p->w)
395	{	978	{
396	p->w->pending = 0;	979	p->w->pending = 0;
397	p->w->cb (p->w, p->events);	980	EV_CB_INVOKE (p->w, p->events);
398	}	981	}
399	}	982	}
400
401	pendingcnt = 0;
402	}	983	}
403		984
404	static void	985	static void
405	timers_reify ()	986	timers_reify (EV_P)
406	{	987	{
407	while (timercnt && timers [0]->at <= now)	988	while (timercnt && ((WT)timers [0])->at <= mn_now)
408	{	989	{
409	struct ev_timer *w = timers [0];	990	struct ev_timer *w = timers [0];
		991
		992	assert (("inactive timer on timer heap detected", ev_is_active (w)));
410		993
411	/* first reschedule or stop timer */	994	/* first reschedule or stop timer */
412	if (w->repeat)	995	if (w->repeat)
413	{	996	{
		997	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
		998
414	w->at = now + w->repeat;	999	((WT)w)->at += w->repeat;
415	assert (("timer timeout in the past, negative repeat?", w->at > now));	1000	if (((WT)w)->at < mn_now)
		1001	((WT)w)->at = mn_now;
		1002
416	downheap ((WT *)timers, timercnt, 0);	1003	downheap ((WT *)timers, timercnt, 0);
417	}	1004	}
418	else	1005	else
419	evtimer_stop (w); /* nonrepeating: stop timer */	1006	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
420		1007
421	event ((W)w, EV_TIMEOUT);	1008	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
422	}	1009	}
423	}	1010	}
424		1011
		1012	#if EV_PERIODICS
425	static void	1013	static void
426	periodics_reify ()	1014	periodics_reify (EV_P)
427	{	1015	{
428	while (periodiccnt && periodics [0]->at <= ev_now)	1016	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
429	{	1017	{
430	struct ev_periodic *w = periodics [0];	1018	struct ev_periodic *w = periodics [0];
431		1019
		1020	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1021
432	/* first reschedule or stop timer */	1022	/* first reschedule or stop timer */
433	if (w->interval)	1023	if (w->reschedule_cb)
434	{	1024	{
		1025	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1026
		1027	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1028	downheap ((WT *)periodics, periodiccnt, 0);
		1029	}
		1030	else if (w->interval)
		1031	{
435	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;	1032	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
436	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));	1033	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
437	downheap ((WT *)periodics, periodiccnt, 0);	1034	downheap ((WT *)periodics, periodiccnt, 0);
438	}	1035	}
439	else	1036	else
440	evperiodic_stop (w); /* nonrepeating: stop timer */	1037	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
441		1038
442	event ((W)w, EV_TIMEOUT);	1039	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
443	}	1040	}
444	}	1041	}
445		1042
446	static void	1043	static void
447	periodics_reschedule (ev_tstamp diff)	1044	periodics_reschedule (EV_P)
448	{	1045	{
449	int i;	1046	int i;
450		1047
451	/* adjust periodics after time jump */	1048	/* adjust periodics after time jump */
452	for (i = 0; i < periodiccnt; ++i)	1049	for (i = 0; i < periodiccnt; ++i)
453	{	1050	{
454	struct ev_periodic *w = periodics [i];	1051	struct ev_periodic *w = periodics [i];
455		1052
		1053	if (w->reschedule_cb)
		1054	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
456	if (w->interval)	1055	else if (w->interval)
		1056	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1057	}
		1058
		1059	/* now rebuild the heap */
		1060	for (i = periodiccnt >> 1; i--; )
		1061	downheap ((WT *)periodics, periodiccnt, i);
		1062	}
		1063	#endif
		1064
		1065	inline int
		1066	time_update_monotonic (EV_P)
		1067	{
		1068	mn_now = get_clock ();
		1069
		1070	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1071	{
		1072	ev_rt_now = rtmn_diff + mn_now;
		1073	return 0;
		1074	}
		1075	else
		1076	{
		1077	now_floor = mn_now;
		1078	ev_rt_now = ev_time ();
		1079	return 1;
		1080	}
		1081	}
		1082
		1083	static void
		1084	time_update (EV_P)
		1085	{
		1086	int i;
		1087
		1088	#if EV_USE_MONOTONIC
		1089	if (expect_true (have_monotonic))
		1090	{
		1091	if (time_update_monotonic (EV_A))
457	{	1092	{
458	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;	1093	ev_tstamp odiff = rtmn_diff;
459		1094
460	if (fabs (diff) >= 1e-4)	1095	for (i = 4; --i; ) /* loop a few times, before making important decisions */
461	{	1096	{
462	evperiodic_stop (w);	1097	rtmn_diff = ev_rt_now - mn_now;
463	evperiodic_start (w);
464		1098
465	i = 0; /* restart loop, inefficient, but time jumps should be rare */	1099	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1100	return; /* all is well */
		1101
		1102	ev_rt_now = ev_time ();
		1103	mn_now = get_clock ();
		1104	now_floor = mn_now;
466	}	1105	}
		1106
		1107	# if EV_PERIODICS
		1108	periodics_reschedule (EV_A);
		1109	# endif
		1110	/* no timer adjustment, as the monotonic clock doesn't jump */
		1111	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
467	}	1112	}
468	}	1113	}
469	}	1114	else
470		1115	#endif
471	static void	1116	{
472	time_update ()
473	{
474	int i;
475
476	ev_now = ev_time ();	1117	ev_rt_now = ev_time ();
477		1118
478	if (have_monotonic)	1119	if (expect_false (mn_now > ev_rt_now \|\| mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
479	{
480	ev_tstamp odiff = diff;
481
482	for (i = 4; --i; ) /* loop a few times, before making important decisions */
483	{	1120	{
484	now = get_clock ();	1121	#if EV_PERIODICS
485	diff = ev_now - now;
486
487	if (fabs (odiff - diff) < MIN_TIMEJUMP)
488	return; /* all is well */
489
490	ev_now = ev_time ();
491	}
492
493	periodics_reschedule (diff - odiff);
494	/* no timer adjustment, as the monotonic clock doesn't jump */
495	}
496	else
497	{
498	if (now > ev_now \|\| now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
499	{
500	periodics_reschedule (ev_now - now);	1122	periodics_reschedule (EV_A);
		1123	#endif
501		1124
502	/* adjust timers. this is easy, as the offset is the same for all */	1125	/* adjust timers. this is easy, as the offset is the same for all */
503	for (i = 0; i < timercnt; ++i)	1126	for (i = 0; i < timercnt; ++i)
504	timers [i]->at += diff;	1127	((WT)timers [i])->at += ev_rt_now - mn_now;
505	}	1128	}
506		1129
507	now = ev_now;	1130	mn_now = ev_rt_now;
508	}	1131	}
509	}	1132	}
510		1133
511	int ev_loop_done;	1134	void
		1135	ev_ref (EV_P)
		1136	{
		1137	++activecnt;
		1138	}
512		1139
		1140	void
		1141	ev_unref (EV_P)
		1142	{
		1143	--activecnt;
		1144	}
		1145
		1146	static int loop_done;
		1147
		1148	void
513	void ev_loop (int flags)	1149	ev_loop (EV_P_ int flags)
514	{	1150	{
515	double block;	1151	double block;
516	ev_loop_done = flags & EVLOOP_ONESHOT ? 1 : 0;	1152	loop_done = flags & (EVLOOP_ONESHOT \| EVLOOP_NONBLOCK) ? 1 : 0;
517
518	if (checkcnt)
519	{
520	queue_events ((W *)checks, checkcnt, EV_CHECK);
521	call_pending ();
522	}
523		1153
524	do	1154	do
525	{	1155	{
		1156	/* queue check watchers (and execute them) */
		1157	if (expect_false (preparecnt))
		1158	{
		1159	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1160	call_pending (EV_A);
		1161	}
		1162
		1163	/* we might have forked, so reify kernel state if necessary */
		1164	if (expect_false (postfork))
		1165	loop_fork (EV_A);
		1166
526	/* update fd-related kernel structures */	1167	/* update fd-related kernel structures */
527	fd_reify ();	1168	fd_reify (EV_A);
528		1169
529	/* calculate blocking time */	1170	/* calculate blocking time */
530		1171
531	/* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */	1172	/* we only need this for !monotonic clock or timers, but as we basically
		1173	always have timers, we just calculate it always */
		1174	#if EV_USE_MONOTONIC
		1175	if (expect_true (have_monotonic))
		1176	time_update_monotonic (EV_A);
		1177	else
		1178	#endif
		1179	{
532	ev_now = ev_time ();	1180	ev_rt_now = ev_time ();
		1181	mn_now = ev_rt_now;
		1182	}
533		1183
534	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)	1184	if (flags & EVLOOP_NONBLOCK \|\| idlecnt)
535	block = 0.;	1185	block = 0.;
536	else	1186	else
537	{	1187	{
538	block = MAX_BLOCKTIME;	1188	block = MAX_BLOCKTIME;
539		1189
540	if (timercnt)	1190	if (timercnt)
541	{	1191	{
542	ev_tstamp to = timers [0]->at - (have_monotonic ? get_clock () : ev_now) + method_fudge;	1192	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
543	if (block > to) block = to;	1193	if (block > to) block = to;
544	}	1194	}
545		1195
		1196	#if EV_PERIODICS
546	if (periodiccnt)	1197	if (periodiccnt)
547	{	1198	{
548	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;	1199	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
549	if (block > to) block = to;	1200	if (block > to) block = to;
550	}	1201	}
		1202	#endif
551		1203
552	if (block < 0.) block = 0.;	1204	if (block < 0.) block = 0.;
553	}	1205	}
554		1206
555	method_poll (block);	1207	method_poll (EV_A_ block);
556		1208
557	/* update ev_now, do magic */	1209	/* update ev_rt_now, do magic */
558	time_update ();	1210	time_update (EV_A);
559		1211
560	/* queue pending timers and reschedule them */	1212	/* queue pending timers and reschedule them */
		1213	timers_reify (EV_A); /* relative timers called last */
		1214	#if EV_PERIODICS
561	periodics_reify (); /* absolute timers first */	1215	periodics_reify (EV_A); /* absolute timers called first */
562	timers_reify (); /* relative timers second */	1216	#endif
563		1217
564	/* queue idle watchers unless io or timers are pending */	1218	/* queue idle watchers unless io or timers are pending */
565	if (!pendingcnt)	1219	if (idlecnt && !any_pending (EV_A))
566	queue_events ((W *)idles, idlecnt, EV_IDLE);	1220	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
567		1221
568	/* queue check and possibly idle watchers */	1222	/* queue check watchers, to be executed first */
		1223	if (checkcnt)
569	queue_events ((W *)checks, checkcnt, EV_CHECK);	1224	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
570		1225
571	call_pending ();	1226	call_pending (EV_A);
572	}	1227	}
573	while (!ev_loop_done);	1228	while (activecnt && !loop_done);
574		1229
575	if (ev_loop_done != 2)	1230	if (loop_done != 2)
576	ev_loop_done = 0;	1231	loop_done = 0;
		1232	}
		1233
		1234	void
		1235	ev_unloop (EV_P_ int how)
		1236	{
		1237	loop_done = how;
577	}	1238	}
578		1239
579	/*****************************************************************************/	1240	/*****************************************************************************/
580		1241
581	static void	1242	inline void
582	wlist_add (WL *head, WL elem)	1243	wlist_add (WL *head, WL elem)
583	{	1244	{
584	elem->next = *head;	1245	elem->next = *head;
585	*head = elem;	1246	*head = elem;
586	}	1247	}
587		1248
588	static void	1249	inline void
589	wlist_del (WL *head, WL elem)	1250	wlist_del (WL *head, WL elem)
590	{	1251	{
591	while (*head)	1252	while (*head)
592	{	1253	{
593	if (*head == elem)	1254	if (*head == elem)
598		1259
599	head = &(*head)->next;	1260	head = &(*head)->next;
600	}	1261	}
601	}	1262	}
602		1263
603	static void	1264	inline void
		1265	ev_clear_pending (EV_P_ W w)
		1266	{
		1267	if (w->pending)
		1268	{
		1269	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1270	w->pending = 0;
		1271	}
		1272	}
		1273
		1274	inline void
604	ev_start (W w, int active)	1275	ev_start (EV_P_ W w, int active)
605	{	1276	{
606	w->pending = 0;	1277	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1278	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1279
607	w->active = active;	1280	w->active = active;
		1281	ev_ref (EV_A);
608	}	1282	}
609		1283
610	static void	1284	inline void
611	ev_stop (W w)	1285	ev_stop (EV_P_ W w)
612	{	1286	{
613	if (w->pending)	1287	ev_unref (EV_A);
614	pendings [w->pending - 1].w = 0;
615
616	w->active = 0;	1288	w->active = 0;
617	}	1289	}
618		1290
619	/*****************************************************************************/	1291	/*****************************************************************************/
620		1292
621	void	1293	void
622	evio_start (struct ev_io *w)	1294	ev_io_start (EV_P_ struct ev_io *w)
623	{	1295	{
		1296	int fd = w->fd;
		1297
624	if (ev_is_active (w))	1298	if (ev_is_active (w))
625	return;	1299	return;
626		1300
627	int fd = w->fd;	1301	assert (("ev_io_start called with negative fd", fd >= 0));
628		1302
629	ev_start ((W)w, 1);	1303	ev_start (EV_A_ (W)w, 1);
630	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1304	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
631	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1305	wlist_add ((WL *)&anfds[fd].head, (WL)w);
632		1306
633	++fdchangecnt;	1307	fd_change (EV_A_ fd);
634	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
635	fdchanges [fdchangecnt - 1] = fd;
636	}	1308	}
637		1309
638	void	1310	void
639	evio_stop (struct ev_io *w)	1311	ev_io_stop (EV_P_ struct ev_io *w)
640	{	1312	{
		1313	ev_clear_pending (EV_A_ (W)w);
641	if (!ev_is_active (w))	1314	if (!ev_is_active (w))
642	return;	1315	return;
643		1316
		1317	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1318
644	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1319	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
645	ev_stop ((W)w);	1320	ev_stop (EV_A_ (W)w);
646		1321
647	++fdchangecnt;	1322	fd_change (EV_A_ w->fd);
648	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
649	fdchanges [fdchangecnt - 1] = w->fd;
650	}	1323	}
651		1324
652
653	void	1325	void
654	evtimer_start (struct ev_timer *w)	1326	ev_timer_start (EV_P_ struct ev_timer *w)
655	{	1327	{
656	if (ev_is_active (w))	1328	if (ev_is_active (w))
657	return;	1329	return;
658		1330
659	w->at += now;	1331	((WT)w)->at += mn_now;
660		1332
661	assert (("timer repeat value less than zero not allowed", w->repeat >= 0.));	1333	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
662		1334
663	ev_start ((W)w, ++timercnt);	1335	ev_start (EV_A_ (W)w, ++timercnt);
664	array_needsize (timers, timermax, timercnt, );	1336	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
665	timers [timercnt - 1] = w;	1337	timers [timercnt - 1] = w;
666	upheap ((WT *)timers, timercnt - 1);	1338	upheap ((WT *)timers, timercnt - 1);
667	}
668		1339
		1340	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1341	}
		1342
669	void	1343	void
670	evtimer_stop (struct ev_timer *w)	1344	ev_timer_stop (EV_P_ struct ev_timer *w)
671	{	1345	{
		1346	ev_clear_pending (EV_A_ (W)w);
672	if (!ev_is_active (w))	1347	if (!ev_is_active (w))
673	return;	1348	return;
674		1349
		1350	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1351
675	if (w->active < timercnt--)	1352	if (((W)w)->active < timercnt--)
676	{	1353	{
677	timers [w->active - 1] = timers [timercnt];	1354	timers [((W)w)->active - 1] = timers [timercnt];
678	downheap ((WT *)timers, timercnt, w->active - 1);	1355	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
679	}	1356	}
680		1357
681	w->at = w->repeat;	1358	((WT)w)->at -= mn_now;
682		1359
683	ev_stop ((W)w);	1360	ev_stop (EV_A_ (W)w);
684	}	1361	}
685		1362
686	void	1363	void
687	evtimer_again (struct ev_timer *w)	1364	ev_timer_again (EV_P_ struct ev_timer *w)
688	{	1365	{
689	if (ev_is_active (w))	1366	if (ev_is_active (w))
690	{	1367	{
691	if (w->repeat)	1368	if (w->repeat)
692	{
693	w->at = now + w->repeat;
694	downheap ((WT *)timers, timercnt, w->active - 1);	1369	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
695	}
696	else	1370	else
697	evtimer_stop (w);	1371	ev_timer_stop (EV_A_ w);
698	}	1372	}
699	else if (w->repeat)	1373	else if (w->repeat)
700	evtimer_start (w);	1374	ev_timer_start (EV_A_ w);
701	}	1375	}
702		1376
		1377	#if EV_PERIODICS
703	void	1378	void
704	evperiodic_start (struct ev_periodic *w)	1379	ev_periodic_start (EV_P_ struct ev_periodic *w)
705	{	1380	{
706	if (ev_is_active (w))	1381	if (ev_is_active (w))
707	return;	1382	return;
708		1383
709	assert (("periodic interval value less than zero not allowed", w->interval >= 0.));	1384	if (w->reschedule_cb)
710		1385	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1386	else if (w->interval)
		1387	{
		1388	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
711	/* this formula differs from the one in periodic_reify because we do not always round up */	1389	/* this formula differs from the one in periodic_reify because we do not always round up */
712	if (w->interval)
713	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;	1390	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1391	}
714		1392
715	ev_start ((W)w, ++periodiccnt);	1393	ev_start (EV_A_ (W)w, ++periodiccnt);
716	array_needsize (periodics, periodicmax, periodiccnt, );	1394	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
717	periodics [periodiccnt - 1] = w;	1395	periodics [periodiccnt - 1] = w;
718	upheap ((WT *)periodics, periodiccnt - 1);	1396	upheap ((WT *)periodics, periodiccnt - 1);
719	}
720		1397
		1398	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1399	}
		1400
721	void	1401	void
722	evperiodic_stop (struct ev_periodic *w)	1402	ev_periodic_stop (EV_P_ struct ev_periodic *w)
723	{	1403	{
		1404	ev_clear_pending (EV_A_ (W)w);
724	if (!ev_is_active (w))	1405	if (!ev_is_active (w))
725	return;	1406	return;
726		1407
		1408	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1409
727	if (w->active < periodiccnt--)	1410	if (((W)w)->active < periodiccnt--)
728	{	1411	{
729	periodics [w->active - 1] = periodics [periodiccnt];	1412	periodics [((W)w)->active - 1] = periodics [periodiccnt];
730	downheap ((WT *)periodics, periodiccnt, w->active - 1);	1413	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
731	}	1414	}
732		1415
733	ev_stop ((W)w);	1416	ev_stop (EV_A_ (W)w);
734	}	1417	}
735		1418
736	void	1419	void
737	evsignal_start (struct ev_signal *w)	1420	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1421	{
		1422	/* TODO: use adjustheap and recalculation */
		1423	ev_periodic_stop (EV_A_ w);
		1424	ev_periodic_start (EV_A_ w);
		1425	}
		1426	#endif
		1427
		1428	void
		1429	ev_idle_start (EV_P_ struct ev_idle *w)
738	{	1430	{
739	if (ev_is_active (w))	1431	if (ev_is_active (w))
740	return;	1432	return;
741		1433
		1434	ev_start (EV_A_ (W)w, ++idlecnt);
		1435	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1436	idles [idlecnt - 1] = w;
		1437	}
		1438
		1439	void
		1440	ev_idle_stop (EV_P_ struct ev_idle *w)
		1441	{
		1442	ev_clear_pending (EV_A_ (W)w);
		1443	if (ev_is_active (w))
		1444	return;
		1445
		1446	idles [((W)w)->active - 1] = idles [--idlecnt];
		1447	ev_stop (EV_A_ (W)w);
		1448	}
		1449
		1450	void
		1451	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1452	{
		1453	if (ev_is_active (w))
		1454	return;
		1455
		1456	ev_start (EV_A_ (W)w, ++preparecnt);
		1457	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1458	prepares [preparecnt - 1] = w;
		1459	}
		1460
		1461	void
		1462	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1463	{
		1464	ev_clear_pending (EV_A_ (W)w);
		1465	if (ev_is_active (w))
		1466	return;
		1467
		1468	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1469	ev_stop (EV_A_ (W)w);
		1470	}
		1471
		1472	void
		1473	ev_check_start (EV_P_ struct ev_check *w)
		1474	{
		1475	if (ev_is_active (w))
		1476	return;
		1477
		1478	ev_start (EV_A_ (W)w, ++checkcnt);
		1479	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1480	checks [checkcnt - 1] = w;
		1481	}
		1482
		1483	void
		1484	ev_check_stop (EV_P_ struct ev_check *w)
		1485	{
		1486	ev_clear_pending (EV_A_ (W)w);
		1487	if (!ev_is_active (w))
		1488	return;
		1489
		1490	checks [((W)w)->active - 1] = checks [--checkcnt];
		1491	ev_stop (EV_A_ (W)w);
		1492	}
		1493
		1494	#ifndef SA_RESTART
		1495	# define SA_RESTART 0
		1496	#endif
		1497
		1498	void
		1499	ev_signal_start (EV_P_ struct ev_signal *w)
		1500	{
		1501	#if EV_MULTIPLICITY
		1502	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1503	#endif
		1504	if (ev_is_active (w))
		1505	return;
		1506
		1507	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1508
742	ev_start ((W)w, 1);	1509	ev_start (EV_A_ (W)w, 1);
743	array_needsize (signals, signalmax, w->signum, signals_init);	1510	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
744	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1511	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
745		1512
746	if (!w->next)	1513	if (!((WL)w)->next)
747	{	1514	{
		1515	#if WIN32
		1516	signal (w->signum, sighandler);
		1517	#else
748	struct sigaction sa;	1518	struct sigaction sa;
749	sa.sa_handler = sighandler;	1519	sa.sa_handler = sighandler;
750	sigfillset (&sa.sa_mask);	1520	sigfillset (&sa.sa_mask);
751	sa.sa_flags = 0;	1521	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
752	sigaction (w->signum, &sa, 0);	1522	sigaction (w->signum, &sa, 0);
		1523	#endif
753	}	1524	}
754	}	1525	}
755		1526
756	void	1527	void
757	evsignal_stop (struct ev_signal *w)	1528	ev_signal_stop (EV_P_ struct ev_signal *w)
758	{	1529	{
		1530	ev_clear_pending (EV_A_ (W)w);
759	if (!ev_is_active (w))	1531	if (!ev_is_active (w))
760	return;	1532	return;
761		1533
762	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1534	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
763	ev_stop ((W)w);	1535	ev_stop (EV_A_ (W)w);
764		1536
765	if (!signals [w->signum - 1].head)	1537	if (!signals [w->signum - 1].head)
766	signal (w->signum, SIG_DFL);	1538	signal (w->signum, SIG_DFL);
767	}	1539	}
768		1540
769	void evidle_start (struct ev_idle *w)	1541	void
		1542	ev_child_start (EV_P_ struct ev_child *w)
770	{	1543	{
		1544	#if EV_MULTIPLICITY
		1545	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1546	#endif
771	if (ev_is_active (w))	1547	if (ev_is_active (w))
772	return;	1548	return;
773		1549
774	ev_start ((W)w, ++idlecnt);	1550	ev_start (EV_A_ (W)w, 1);
775	array_needsize (idles, idlemax, idlecnt, );	1551	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
776	idles [idlecnt - 1] = w;
777	}	1552	}
778		1553
779	void evidle_stop (struct ev_idle *w)	1554	void
		1555	ev_child_stop (EV_P_ struct ev_child *w)
780	{	1556	{
781	idles [w->active - 1] = idles [--idlecnt];	1557	ev_clear_pending (EV_A_ (W)w);
782	ev_stop ((W)w);
783	}
784
785	void evcheck_start (struct ev_check *w)
786	{
787	if (ev_is_active (w))	1558	if (!ev_is_active (w))
788	return;	1559	return;
789		1560
790	ev_start ((W)w, ++checkcnt);	1561	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
791	array_needsize (checks, checkmax, checkcnt, );
792	checks [checkcnt - 1] = w;
793	}
794
795	void evcheck_stop (struct ev_check *w)
796	{
797	checks [w->active - 1] = checks [--checkcnt];
798	ev_stop ((W)w);	1562	ev_stop (EV_A_ (W)w);
799	}	1563	}
800		1564
801	/*****************************************************************************/	1565	/*****************************************************************************/
802		1566
803	#if 0	1567	struct ev_once
804		1568	{
805	struct ev_io wio;	1569	struct ev_io io;
806
807	static void
808	sin_cb (struct ev_io *w, int revents)
809	{
810	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
811	}
812
813	static void
814	ocb (struct ev_timer *w, int revents)
815	{
816	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
817	evtimer_stop (w);
818	evtimer_start (w);
819	}
820
821	static void
822	scb (struct ev_signal *w, int revents)
823	{
824	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
825	evio_stop (&wio);
826	evio_start (&wio);
827	}
828
829	static void
830	gcb (struct ev_signal *w, int revents)
831	{
832	fprintf (stderr, "generic %x\n", revents);
833
834	}
835
836	int main (void)
837	{
838	ev_init (0);
839
840	evio_init (&wio, sin_cb, 0, EV_READ);
841	evio_start (&wio);
842
843	struct ev_timer t[10000];
844
845	#if 0
846	int i;
847	for (i = 0; i < 10000; ++i)
848	{
849	struct ev_timer *w = t + i;
850	evw_init (w, ocb, i);
851	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
852	evtimer_start (w);
853	if (drand48 () < 0.5)
854	evtimer_stop (w);
855	}
856	#endif
857
858	struct ev_timer t1;	1570	struct ev_timer to;
859	evtimer_init (&t1, ocb, 5, 10);	1571	void (cb)(int revents, void arg);
860	evtimer_start (&t1);	1572	void *arg;
		1573	};
861		1574
862	struct ev_signal sig;	1575	static void
863	evsignal_init (&sig, scb, SIGQUIT);	1576	once_cb (EV_P_ struct ev_once *once, int revents)
864	evsignal_start (&sig);	1577	{
		1578	void (cb)(int revents, void arg) = once->cb;
		1579	void *arg = once->arg;
865		1580
866	struct ev_check cw;	1581	ev_io_stop (EV_A_ &once->io);
867	evcheck_init (&cw, gcb);	1582	ev_timer_stop (EV_A_ &once->to);
868	evcheck_start (&cw);	1583	ev_free (once);
869		1584
870	struct ev_idle iw;	1585	cb (revents, arg);
871	evidle_init (&iw, gcb);
872	evidle_start (&iw);
873
874	ev_loop (0);
875
876	return 0;
877	}	1586	}
878		1587
879	#endif	1588	static void
		1589	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1590	{
		1591	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, io)), revents);
		1592	}
880		1593
		1594	static void
		1595	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1596	{
		1597	once_cb (EV_A_ (struct ev_once )(((char )w) - offsetof (struct ev_once, to)), revents);
		1598	}
881		1599
		1600	void
		1601	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg)
		1602	{
		1603	struct ev_once once = (struct ev_once )ev_malloc (sizeof (struct ev_once));
882		1604
		1605	if (!once)
		1606	cb (EV_ERROR \| EV_READ \| EV_WRITE \| EV_TIMEOUT, arg);
		1607	else
		1608	{
		1609	once->cb = cb;
		1610	once->arg = arg;
883		1611
		1612	ev_init (&once->io, once_cb_io);
		1613	if (fd >= 0)
		1614	{
		1615	ev_io_set (&once->io, fd, events);
		1616	ev_io_start (EV_A_ &once->io);
		1617	}
		1618
		1619	ev_init (&once->to, once_cb_to);
		1620	if (timeout >= 0.)
		1621	{
		1622	ev_timer_set (&once->to, timeout, 0.);
		1623	ev_timer_start (EV_A_ &once->to);
		1624	}
		1625	}
		1626	}
		1627
		1628	#ifdef __cplusplus
		1629	}
		1630	#endif
		1631

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Comparing libev/ev.c (file contents): Revision 1.15 by root, Wed Oct 31 11:56:34 2007 UTC vs. Revision 1.97 by root, Sun Nov 11 01:53:07 2007 UTC

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Comparing libev/ev.c (file contents):
Revision 1.15 by root, Wed Oct 31 11:56:34 2007 UTC vs.
Revision 1.97 by root, Sun Nov 11 01:53:07 2007 UTC