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Comparing libev/ev.c (file contents):
Revision 1.12 by root, Wed Oct 31 09:23:17 2007 UTC vs.
Revision 1.98 by root, Sun Nov 11 02:05:20 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
38		145
39	struct ev_watcher {	146	#if __GNUC__ >= 3
40	EV_WATCHER (ev_watcher);	147	# define expect(expr,value) __builtin_expect ((expr),(value))
41	};	148	# define inline inline
		149	#else
		150	# define expect(expr,value) (expr)
		151	# define inline static
		152	#endif
42		153
43	struct ev_watcher_list {	154	#define expect_false(expr) expect ((expr) != 0, 0)
44	EV_WATCHER_LIST (ev_watcher_list);	155	#define expect_true(expr) expect ((expr) != 0, 1)
45	};
46		156
47	struct ev_watcher_time {	157	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
48	EV_WATCHER_TIME (ev_watcher_time);	158	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
49	};
50		159
51	typedef struct ev_watcher *W;	160	typedef struct ev_watcher *W;
52	typedef struct ev_watcher_list *WL;	161	typedef struct ev_watcher_list *WL;
53	typedef struct ev_watcher_time *WT;	162	typedef struct ev_watcher_time *WT;
54		163
55	static ev_tstamp now, diff; /* monotonic clock */	164	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		165
		166	#ifdef WIN32
		167	# include "ev_win32.c"
		168	#endif
		169
		170	/*****************************************************************************/
		171
		172	static void (*syserr_cb)(const char *msg);
		173
		174	void ev_set_syserr_cb (void (*cb)(const char *msg))
		175	{
		176	syserr_cb = cb;
		177	}
		178
		179	static void
		180	syserr (const char *msg)
		181	{
		182	if (!msg)
		183	msg = "(libev) system error";
		184
		185	if (syserr_cb)
		186	syserr_cb (msg);
		187	else
		188	{
		189	perror (msg);
		190	abort ();
		191	}
		192	}
		193
		194	static void *(*alloc)(void *ptr, long size);
		195
		196	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		197	{
		198	alloc = cb;
		199	}
		200
		201	static void *
		202	ev_realloc (void *ptr, long size)
		203	{
		204	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		205
		206	if (!ptr && size)
		207	{
		208	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		209	abort ();
		210	}
		211
		212	return ptr;
		213	}
		214
		215	#define ev_malloc(size) ev_realloc (0, (size))
		216	#define ev_free(ptr) ev_realloc ((ptr), 0)
		217
		218	/*****************************************************************************/
		219
		220	typedef struct
		221	{
		222	WL head;
		223	unsigned char events;
		224	unsigned char reify;
		225	} ANFD;
		226
		227	typedef struct
		228	{
		229	W w;
		230	int events;
		231	} ANPENDING;
		232
		233	#if EV_MULTIPLICITY
		234
		235	struct ev_loop
		236	{
		237	ev_tstamp ev_rt_now;
		238	#define VAR(name,decl) decl;
		239	#include "ev_vars.h"
		240	#undef VAR
		241	};
		242	#include "ev_wrap.h"
		243
		244	struct ev_loop default_loop_struct;
		245	static struct ev_loop *default_loop;
		246
		247	#else
		248
56	ev_tstamp ev_now;	249	ev_tstamp ev_rt_now;
57	int ev_method;	250	#define VAR(name,decl) static decl;
		251	#include "ev_vars.h"
		252	#undef VAR
58		253
59	static int have_monotonic; /* runtime */	254	static int default_loop;
60		255
61	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	256	#endif
62	static void (*method_modify)(int fd, int oev, int nev);
63	static void (*method_poll)(ev_tstamp timeout);
64		257
65	/*****************************************************************************/	258	/*****************************************************************************/
66		259
67	ev_tstamp	260	ev_tstamp
68	ev_time (void)	261	ev_time (void)
69	{	262	{
70	#if HAVE_REALTIME	263	#if EV_USE_REALTIME
71	struct timespec ts;	264	struct timespec ts;
72	clock_gettime (CLOCK_REALTIME, &ts);	265	clock_gettime (CLOCK_REALTIME, &ts);
73	return ts.tv_sec + ts.tv_nsec * 1e-9;	266	return ts.tv_sec + ts.tv_nsec * 1e-9;
74	#else	267	#else
75	struct timeval tv;	268	struct timeval tv;
76	gettimeofday (&tv, 0);	269	gettimeofday (&tv, 0);
77	return tv.tv_sec + tv.tv_usec * 1e-6;	270	return tv.tv_sec + tv.tv_usec * 1e-6;
78	#endif	271	#endif
79	}	272	}
80		273
81	static ev_tstamp	274	inline ev_tstamp
82	get_clock (void)	275	get_clock (void)
83	{	276	{
84	#if HAVE_MONOTONIC	277	#if EV_USE_MONOTONIC
85	if (have_monotonic)	278	if (expect_true (have_monotonic))
86	{	279	{
87	struct timespec ts;	280	struct timespec ts;
88	clock_gettime (CLOCK_MONOTONIC, &ts);	281	clock_gettime (CLOCK_MONOTONIC, &ts);
89	return ts.tv_sec + ts.tv_nsec * 1e-9;	282	return ts.tv_sec + ts.tv_nsec * 1e-9;
90	}	283	}
91	#endif	284	#endif
92		285
93	return ev_time ();	286	return ev_time ();
94	}	287	}
95		288
		289	#if EV_MULTIPLICITY
		290	ev_tstamp
		291	ev_now (EV_P)
		292	{
		293	return ev_rt_now;
		294	}
		295	#endif
		296
		297	#define array_roundsize(type,n) ((n) | 4 & ~3)
		298
96	#define array_needsize(base,cur,cnt,init) \	299	#define array_needsize(type,base,cur,cnt,init) \
97	if ((cnt) > cur) \	300	if (expect_false ((cnt) > cur)) \
98	{ \	301	{ \
99	int newcnt = cur ? cur << 1 : 16; \	302	int newcnt = cur; \
100	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	303	do \
		304	{ \
		305	newcnt = array_roundsize (type, newcnt << 1); \
		306	} \
		307	while ((cnt) > newcnt); \
		308	\
101	base = realloc (base, sizeof (*base) * (newcnt)); \	309	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
102	init (base + cur, newcnt - cur); \	310	init (base + cur, newcnt - cur); \
103	cur = newcnt; \	311	cur = newcnt; \
104	}	312	}
		313
		314	#define array_slim(type,stem) \
		315	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		316	{ \
		317	stem ## max = array_roundsize (stem ## cnt >> 1); \
		318	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		319	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		320	}
		321
		322	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
		323	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		324	#define array_free_microshit(stem) \
		325	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
		326
		327	#define array_free(stem, idx) \
		328	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
105		329
106	/*****************************************************************************/	330	/*****************************************************************************/
107		331
108	typedef struct
109	{
110	struct ev_io *head;
111	unsigned char wev, rev; /* want, received event set */
112	} ANFD;
113
114	static ANFD *anfds;
115	static int anfdmax;
116
117	static int *fdchanges;
118	static int fdchangemax, fdchangecnt;
119
120	static void	332	static void
121	anfds_init (ANFD *base, int count)	333	anfds_init (ANFD *base, int count)
122	{	334	{
123	while (count--)	335	while (count--)
124	{	336	{
125	base->head = 0;	337	base->head = 0;
126	base->wev = base->rev = EV_NONE;	338	base->events = EV_NONE;
		339	base->reify = 0;
		340
127	++base;	341	++base;
128	}	342	}
129	}	343	}
130		344
131	typedef struct	345	void
		346	ev_feed_event (EV_P_ void *w, int revents)
132	{	347	{
133	W w;	348	W w_ = (W)w;
134	int events;
135	} ANPENDING;
136		349
137	static ANPENDING *pendings;	350	if (w_->pending)
138	static int pendingmax, pendingcnt;	351	{
		352	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		353	return;
		354	}
139		355
140	static void
141	event (W w, int events)
142	{
143	w->pending = ++pendingcnt;	356	w_->pending = ++pendingcnt [ABSPRI (w_)];
144	array_needsize (pendings, pendingmax, pendingcnt, );	357	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], (void));
145	pendings [pendingcnt - 1].w = w;	358	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
146	pendings [pendingcnt - 1].events = events;	359	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
147	}	360	}
148		361
149	static void	362	static void
		363	queue_events (EV_P_ W *events, int eventcnt, int type)
		364	{
		365	int i;
		366
		367	for (i = 0; i < eventcnt; ++i)
		368	ev_feed_event (EV_A_ events [i], type);
		369	}
		370
		371	inline void
150	fd_event (int fd, int events)	372	fd_event (EV_P_ int fd, int revents)
151	{	373	{
152	ANFD *anfd = anfds + fd;	374	ANFD *anfd = anfds + fd;
153	struct ev_io *w;	375	struct ev_io *w;
154		376
155	for (w = anfd->head; w; w = w->next)	377	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
156	{	378	{
157	int ev = w->events & events;	379	int ev = w->events & revents;
158		380
159	if (ev)	381	if (ev)
160	event ((W)w, ev);	382	ev_feed_event (EV_A_ (W)w, ev);
161	}	383	}
162	}	384	}
163		385
		386	void
		387	ev_feed_fd_event (EV_P_ int fd, int revents)
		388	{
		389	fd_event (EV_A_ fd, revents);
		390	}
		391
		392	/*****************************************************************************/
		393
164	static void	394	static void
165	queue_events (W *events, int eventcnt, int type)	395	fd_reify (EV_P)
166	{	396	{
167	int i;	397	int i;
168		398
169	for (i = 0; i < eventcnt; ++i)	399	for (i = 0; i < fdchangecnt; ++i)
170	event (events [i], type);	400	{
		401	int fd = fdchanges [i];
		402	ANFD *anfd = anfds + fd;
		403	struct ev_io *w;
		404
		405	int events = 0;
		406
		407	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		408	events |= w->events;
		409
		410	anfd->reify = 0;
		411
		412	method_modify (EV_A_ fd, anfd->events, events);
		413	anfd->events = events;
		414	}
		415
		416	fdchangecnt = 0;
		417	}
		418
		419	static void
		420	fd_change (EV_P_ int fd)
		421	{
		422	if (anfds [fd].reify)
		423	return;
		424
		425	anfds [fd].reify = 1;
		426
		427	++fdchangecnt;
		428	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, (void));
		429	fdchanges [fdchangecnt - 1] = fd;
		430	}
		431
		432	static void
		433	fd_kill (EV_P_ int fd)
		434	{
		435	struct ev_io *w;
		436
		437	while ((w = (struct ev_io *)anfds [fd].head))
		438	{
		439	ev_io_stop (EV_A_ w);
		440	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		441	}
		442	}
		443
		444	static int
		445	fd_valid (int fd)
		446	{
		447	#ifdef WIN32
		448	return !!win32_get_osfhandle (fd);
		449	#else
		450	return fcntl (fd, F_GETFD) != -1;
		451	#endif
		452	}
		453
		454	/* called on EBADF to verify fds */
		455	static void
		456	fd_ebadf (EV_P)
		457	{
		458	int fd;
		459
		460	for (fd = 0; fd < anfdmax; ++fd)
		461	if (anfds [fd].events)
		462	if (!fd_valid (fd) == -1 && errno == EBADF)
		463	fd_kill (EV_A_ fd);
		464	}
		465
		466	/* called on ENOMEM in select/poll to kill some fds and retry */
		467	static void
		468	fd_enomem (EV_P)
		469	{
		470	int fd;
		471
		472	for (fd = anfdmax; fd--; )
		473	if (anfds [fd].events)
		474	{
		475	fd_kill (EV_A_ fd);
		476	return;
		477	}
		478	}
		479
		480	/* usually called after fork if method needs to re-arm all fds from scratch */
		481	static void
		482	fd_rearm_all (EV_P)
		483	{
		484	int fd;
		485
		486	/* this should be highly optimised to not do anything but set a flag */
		487	for (fd = 0; fd < anfdmax; ++fd)
		488	if (anfds [fd].events)
		489	{
		490	anfds [fd].events = 0;
		491	fd_change (EV_A_ fd);
		492	}
171	}	493	}
172		494
173	/*****************************************************************************/	495	/*****************************************************************************/
174		496
175	static struct ev_timer **timers;
176	static int timermax, timercnt;
177
178	static struct ev_periodic **periodics;
179	static int periodicmax, periodiccnt;
180
181	static void	497	static void
182	upheap (WT *timers, int k)	498	upheap (WT *heap, int k)
183	{	499	{
184	WT w = timers [k];	500	WT w = heap [k];
185		501
186	while (k && timers [k >> 1]->at > w->at)	502	while (k && heap [k >> 1]->at > w->at)
187	{	503	{
188	timers [k] = timers [k >> 1];	504	heap [k] = heap [k >> 1];
189	timers [k]->active = k + 1;	505	((W)heap [k])->active = k + 1;
190	k >>= 1;	506	k >>= 1;
191	}	507	}
192		508
193	timers [k] = w;	509	heap [k] = w;
194	timers [k]->active = k + 1;	510	((W)heap [k])->active = k + 1;
195		511
196	}	512	}
197		513
198	static void	514	static void
199	downheap (WT *timers, int N, int k)	515	downheap (WT *heap, int N, int k)
200	{	516	{
201	WT w = timers [k];	517	WT w = heap [k];
202		518
203	while (k < (N >> 1))	519	while (k < (N >> 1))
204	{	520	{
205	int j = k << 1;	521	int j = k << 1;
206		522
207	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	523	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
208	++j;	524	++j;
209		525
210	if (w->at <= timers [j]->at)	526	if (w->at <= heap [j]->at)
211	break;	527	break;
212		528
213	timers [k] = timers [j];	529	heap [k] = heap [j];
214	timers [k]->active = k + 1;	530	((W)heap [k])->active = k + 1;
215	k = j;	531	k = j;
216	}	532	}
217		533
218	timers [k] = w;	534	heap [k] = w;
219	timers [k]->active = k + 1;	535	((W)heap [k])->active = k + 1;
		536	}
		537
		538	inline void
		539	adjustheap (WT *heap, int N, int k, ev_tstamp at)
		540	{
		541	ev_tstamp old_at = heap [k]->at;
		542	heap [k]->at = at;
		543
		544	if (old_at < at)
		545	downheap (heap, N, k);
		546	else
		547	upheap (heap, k);
220	}	548	}
221		549
222	/*****************************************************************************/	550	/*****************************************************************************/
223		551
224	typedef struct	552	typedef struct
225	{	553	{
226	struct ev_signal *head;	554	WL head;
227	sig_atomic_t gotsig;	555	sig_atomic_t volatile gotsig;
228	} ANSIG;	556	} ANSIG;
229		557
230	static ANSIG *signals;	558	static ANSIG *signals;
231	static int signalmax;	559	static int signalmax;
232		560
233	static int sigpipe [2];	561	static int sigpipe [2];
234	static sig_atomic_t gotsig;	562	static sig_atomic_t volatile gotsig;
235	static struct ev_io sigev;	563	static struct ev_io sigev;
236		564
237	static void	565	static void
238	signals_init (ANSIG *base, int count)	566	signals_init (ANSIG *base, int count)
239	{	567	{
240	while (count--)	568	while (count--)
241	{	569	{
242	base->head = 0;	570	base->head = 0;
243	base->gotsig = 0;	571	base->gotsig = 0;
		572
244	++base;	573	++base;
245	}	574	}
246	}	575	}
247		576
248	static void	577	static void
249	sighandler (int signum)	578	sighandler (int signum)
250	{	579	{
		580	#if WIN32
		581	signal (signum, sighandler);
		582	#endif
		583
251	signals [signum - 1].gotsig = 1;	584	signals [signum - 1].gotsig = 1;
252		585
253	if (!gotsig)	586	if (!gotsig)
254	{	587	{
		588	int old_errno = errno;
255	gotsig = 1;	589	gotsig = 1;
		590	#ifdef WIN32
		591	send (sigpipe [1], &signum, 1, MSG_DONTWAIT);
		592	#else
256	write (sigpipe [1], &gotsig, 1);	593	write (sigpipe [1], &signum, 1);
		594	#endif
		595	errno = old_errno;
257	}	596	}
258	}	597	}
259		598
		599	void
		600	ev_feed_signal_event (EV_P_ int signum)
		601	{
		602	WL w;
		603
		604	#if EV_MULTIPLICITY
		605	assert (("feeding signal events is only supported in the default loop", loop == default_loop));
		606	#endif
		607
		608	--signum;
		609
		610	if (signum < 0 || signum >= signalmax)
		611	return;
		612
		613	signals [signum].gotsig = 0;
		614
		615	for (w = signals [signum].head; w; w = w->next)
		616	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		617	}
		618
260	static void	619	static void
261	sigcb (struct ev_io *iow, int revents)	620	sigcb (EV_P_ struct ev_io *iow, int revents)
262	{	621	{
263	struct ev_signal *w;
264	int sig;	622	int signum;
265		623
		624	#ifdef WIN32
		625	recv (sigpipe [0], &revents, 1, MSG_DONTWAIT);
		626	#else
		627	read (sigpipe [0], &revents, 1);
		628	#endif
266	gotsig = 0;	629	gotsig = 0;
267	read (sigpipe [0], &revents, 1);
268		630
269	for (sig = signalmax; sig--; )	631	for (signum = signalmax; signum--; )
270	if (signals [sig].gotsig)	632	if (signals [signum].gotsig)
271	{	633	ev_feed_signal_event (EV_A_ signum + 1);
272	signals [sig].gotsig = 0;
273
274	for (w = signals [sig].head; w; w = w->next)
275	event ((W)w, EV_SIGNAL);
276	}
277	}	634	}
278		635
279	static void	636	static void
280	siginit (void)	637	siginit (EV_P)
281	{	638	{
		639	#ifndef WIN32
282	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	640	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
283	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	641	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
284		642
285	/* rather than sort out wether we really need nb, set it */	643	/* rather than sort out wether we really need nb, set it */
286	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	644	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
287	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	645	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		646	#endif
288		647
289	evio_set (&sigev, sigpipe [0], EV_READ);	648	ev_io_set (&sigev, sigpipe [0], EV_READ);
290	evio_start (&sigev);	649	ev_io_start (EV_A_ &sigev);
		650	ev_unref (EV_A); /* child watcher should not keep loop alive */
291	}	651	}
292		652
293	/*****************************************************************************/	653	/*****************************************************************************/
294		654
295	static struct ev_idle **idles;	655	static struct ev_child *childs [PID_HASHSIZE];
296	static int idlemax, idlecnt;
297		656
298	static struct ev_check **checks;	657	#ifndef WIN32
299	static int checkmax, checkcnt;	658
		659	static struct ev_signal childev;
		660
		661	#ifndef WCONTINUED
		662	# define WCONTINUED 0
		663	#endif
		664
		665	static void
		666	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		667	{
		668	struct ev_child *w;
		669
		670	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		671	if (w->pid == pid || !w->pid)
		672	{
		673	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		674	w->rpid = pid;
		675	w->rstatus = status;
		676	ev_feed_event (EV_A_ (W)w, EV_CHILD);
		677	}
		678	}
		679
		680	static void
		681	childcb (EV_P_ struct ev_signal *sw, int revents)
		682	{
		683	int pid, status;
		684
		685	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		686	{
		687	/* make sure we are called again until all childs have been reaped */
		688	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
		689
		690	child_reap (EV_A_ sw, pid, pid, status);
		691	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		692	}
		693	}
		694
		695	#endif
300		696
301	/*****************************************************************************/	697	/*****************************************************************************/
302		698
		699	#if EV_USE_KQUEUE
		700	# include "ev_kqueue.c"
		701	#endif
303	#if HAVE_EPOLL	702	#if EV_USE_EPOLL
304	# include "ev_epoll.c"	703	# include "ev_epoll.c"
305	#endif	704	#endif
		705	#if EV_USE_POLL
		706	# include "ev_poll.c"
		707	#endif
306	#if HAVE_SELECT	708	#if EV_USE_SELECT
307	# include "ev_select.c"	709	# include "ev_select.c"
308	#endif	710	#endif
309		711
310	int ev_init (int flags)	712	int
		713	ev_version_major (void)
311	{	714	{
		715	return EV_VERSION_MAJOR;
		716	}
		717
		718	int
		719	ev_version_minor (void)
		720	{
		721	return EV_VERSION_MINOR;
		722	}
		723
		724	/* return true if we are running with elevated privileges and should ignore env variables */
		725	static int
		726	enable_secure (void)
		727	{
		728	#ifdef WIN32
		729	return 0;
		730	#else
		731	return getuid () != geteuid ()
		732	|| getgid () != getegid ();
		733	#endif
		734	}
		735
		736	int
		737	ev_method (EV_P)
		738	{
		739	return method;
		740	}
		741
		742	static void
		743	loop_init (EV_P_ int methods)
		744	{
		745	if (!method)
		746	{
312	#if HAVE_MONOTONIC	747	#if EV_USE_MONOTONIC
313	{	748	{
314	struct timespec ts;	749	struct timespec ts;
315	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	750	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
316	have_monotonic = 1;	751	have_monotonic = 1;
317	}	752	}
318	#endif	753	#endif
319		754
320	ev_now = ev_time ();	755	ev_rt_now = ev_time ();
321	now = get_clock ();	756	mn_now = get_clock ();
322	diff = ev_now - now;	757	now_floor = mn_now;
		758	rtmn_diff = ev_rt_now - mn_now;
323		759
324	if (pipe (sigpipe))	760	if (methods == EVMETHOD_AUTO)
325	return 0;	761	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		762	methods = atoi (getenv ("LIBEV_METHODS"));
		763	else
		764	methods = EVMETHOD_ANY;
326		765
327	ev_method = EVMETHOD_NONE;	766	method = 0;
		767	#if EV_USE_WIN32
		768	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		769	#endif
		770	#if EV_USE_KQUEUE
		771	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		772	#endif
328	#if HAVE_EPOLL	773	#if EV_USE_EPOLL
329	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	774	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
330	#endif	775	#endif
		776	#if EV_USE_POLL
		777	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		778	#endif
331	#if HAVE_SELECT	779	#if EV_USE_SELECT
332	if (ev_method == EVMETHOD_NONE) select_init (flags);	780	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
333	#endif	781	#endif
334		782
335	if (ev_method)
336	{
337	evw_init (&sigev, sigcb);	783	ev_init (&sigev, sigcb);
		784	ev_set_priority (&sigev, EV_MAXPRI);
		785	}
		786	}
		787
		788	void
		789	loop_destroy (EV_P)
		790	{
		791	int i;
		792
		793	#if EV_USE_WIN32
		794	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		795	#endif
		796	#if EV_USE_KQUEUE
		797	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		798	#endif
		799	#if EV_USE_EPOLL
		800	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		801	#endif
		802	#if EV_USE_POLL
		803	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		804	#endif
		805	#if EV_USE_SELECT
		806	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		807	#endif
		808
		809	for (i = NUMPRI; i--; )
		810	array_free (pending, [i]);
		811
		812	/* have to use the microsoft-never-gets-it-right macro */
		813	array_free_microshit (fdchange);
		814	array_free_microshit (timer);
		815	#if EV_PERIODICS
		816	array_free_microshit (periodic);
		817	#endif
		818	array_free_microshit (idle);
		819	array_free_microshit (prepare);
		820	array_free_microshit (check);
		821
		822	method = 0;
		823	}
		824
		825	static void
		826	loop_fork (EV_P)
		827	{
		828	#if EV_USE_EPOLL
		829	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		830	#endif
		831	#if EV_USE_KQUEUE
		832	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		833	#endif
		834
		835	if (ev_is_active (&sigev))
		836	{
		837	/* default loop */
		838
		839	ev_ref (EV_A);
		840	ev_io_stop (EV_A_ &sigev);
		841	close (sigpipe [0]);
		842	close (sigpipe [1]);
		843
		844	while (pipe (sigpipe))
		845	syserr ("(libev) error creating pipe");
		846
338	siginit ();	847	siginit (EV_A);
		848	}
		849
		850	postfork = 0;
		851	}
		852
		853	#if EV_MULTIPLICITY
		854	struct ev_loop *
		855	ev_loop_new (int methods)
		856	{
		857	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		858
		859	memset (loop, 0, sizeof (struct ev_loop));
		860
		861	loop_init (EV_A_ methods);
		862
		863	if (ev_method (EV_A))
		864	return loop;
		865
		866	return 0;
		867	}
		868
		869	void
		870	ev_loop_destroy (EV_P)
		871	{
		872	loop_destroy (EV_A);
		873	ev_free (loop);
		874	}
		875
		876	void
		877	ev_loop_fork (EV_P)
		878	{
		879	postfork = 1;
		880	}
		881
		882	#endif
		883
		884	#if EV_MULTIPLICITY
		885	struct ev_loop *
		886	#else
		887	int
		888	#endif
		889	ev_default_loop (int methods)
		890	{
		891	if (sigpipe [0] == sigpipe [1])
		892	if (pipe (sigpipe))
		893	return 0;
		894
		895	if (!default_loop)
339	}	896	{
		897	#if EV_MULTIPLICITY
		898	struct ev_loop *loop = default_loop = &default_loop_struct;
		899	#else
		900	default_loop = 1;
		901	#endif
340		902
341	return ev_method;	903	loop_init (EV_A_ methods);
		904
		905	if (ev_method (EV_A))
		906	{
		907	siginit (EV_A);
		908
		909	#ifndef WIN32
		910	ev_signal_init (&childev, childcb, SIGCHLD);
		911	ev_set_priority (&childev, EV_MAXPRI);
		912	ev_signal_start (EV_A_ &childev);
		913	ev_unref (EV_A); /* child watcher should not keep loop alive */
		914	#endif
		915	}
		916	else
		917	default_loop = 0;
		918	}
		919
		920	return default_loop;
		921	}
		922
		923	void
		924	ev_default_destroy (void)
		925	{
		926	#if EV_MULTIPLICITY
		927	struct ev_loop *loop = default_loop;
		928	#endif
		929
		930	#ifndef WIN32
		931	ev_ref (EV_A); /* child watcher */
		932	ev_signal_stop (EV_A_ &childev);
		933	#endif
		934
		935	ev_ref (EV_A); /* signal watcher */
		936	ev_io_stop (EV_A_ &sigev);
		937
		938	close (sigpipe [0]); sigpipe [0] = 0;
		939	close (sigpipe [1]); sigpipe [1] = 0;
		940
		941	loop_destroy (EV_A);
		942	}
		943
		944	void
		945	ev_default_fork (void)
		946	{
		947	#if EV_MULTIPLICITY
		948	struct ev_loop *loop = default_loop;
		949	#endif
		950
		951	if (method)
		952	postfork = 1;
342	}	953	}
343		954
344	/*****************************************************************************/	955	/*****************************************************************************/
345		956
346	void ev_prefork (void)
347	{
348	/* nop */
349	}
350
351	void ev_postfork_parent (void)
352	{
353	/* nop */
354	}
355
356	void ev_postfork_child (void)
357	{
358	#if HAVE_EPOLL
359	if (ev_method == EVMETHOD_EPOLL)
360	epoll_postfork_child ();
361	#endif
362
363	evio_stop (&sigev);
364	close (sigpipe [0]);
365	close (sigpipe [1]);
366	pipe (sigpipe);
367	siginit ();
368	}
369
370	/*****************************************************************************/
371
372	static void	957	static int
373	fd_reify (void)	958	any_pending (EV_P)
374	{	959	{
375	int i;	960	int pri;
376		961
377	for (i = 0; i < fdchangecnt; ++i)	962	for (pri = NUMPRI; pri--; )
378	{	963	if (pendingcnt [pri])
379	int fd = fdchanges [i];	964	return 1;
380	ANFD *anfd = anfds + fd;
381	struct ev_io *w;
382		965
383	int wev = 0;	966	return 0;
384
385	for (w = anfd->head; w; w = w->next)
386	wev |= w->events;
387
388	if (anfd->wev != wev)
389	{
390	method_modify (fd, anfd->wev, wev);
391	anfd->wev = wev;
392	}
393	}
394
395	fdchangecnt = 0;
396	}	967	}
397		968
398	static void	969	static void
399	call_pending ()	970	call_pending (EV_P)
400	{	971	{
401	int i;	972	int pri;
402		973
403	for (i = 0; i < pendingcnt; ++i)	974	for (pri = NUMPRI; pri--; )
		975	while (pendingcnt [pri])
404	{	976	{
405	ANPENDING *p = pendings + i;	977	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
406		978
407	if (p->w)	979	if (p->w)
408	{	980	{
409	p->w->pending = 0;	981	p->w->pending = 0;
410	p->w->cb (p->w, p->events);	982	EV_CB_INVOKE (p->w, p->events);
411	}	983	}
412	}	984	}
413
414	pendingcnt = 0;
415	}	985	}
416		986
417	static void	987	static void
418	timers_reify ()	988	timers_reify (EV_P)
419	{	989	{
420	while (timercnt && timers [0]->at <= now)	990	while (timercnt && ((WT)timers [0])->at <= mn_now)
421	{	991	{
422	struct ev_timer *w = timers [0];	992	struct ev_timer *w = timers [0];
		993
		994	assert (("inactive timer on timer heap detected", ev_is_active (w)));
423		995
424	/* first reschedule or stop timer */	996	/* first reschedule or stop timer */
425	if (w->repeat)	997	if (w->repeat)
426	{	998	{
		999	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
		1000
427	w->at = now + w->repeat;	1001	((WT)w)->at += w->repeat;
428	assert (("timer timeout in the past, negative repeat?", w->at > now));	1002	if (((WT)w)->at < mn_now)
		1003	((WT)w)->at = mn_now;
		1004
429	downheap ((WT *)timers, timercnt, 0);	1005	downheap ((WT *)timers, timercnt, 0);
430	}	1006	}
431	else	1007	else
432	evtimer_stop (w); /* nonrepeating: stop timer */	1008	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
433		1009
434	event ((W)w, EV_TIMEOUT);	1010	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
435	}	1011	}
436	}	1012	}
437		1013
		1014	#if EV_PERIODICS
438	static void	1015	static void
439	periodics_reify ()	1016	periodics_reify (EV_P)
440	{	1017	{
441	while (periodiccnt && periodics [0]->at <= ev_now)	1018	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
442	{	1019	{
443	struct ev_periodic *w = periodics [0];	1020	struct ev_periodic *w = periodics [0];
444		1021
		1022	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1023
445	/* first reschedule or stop timer */	1024	/* first reschedule or stop timer */
446	if (w->interval)	1025	if (w->reschedule_cb)
447	{	1026	{
		1027	ev_tstamp at = ((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1028
		1029	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1030	downheap ((WT *)periodics, periodiccnt, 0);
		1031	}
		1032	else if (w->interval)
		1033	{
448	w->at += floor ((ev_now - w->at) / w->interval + 1.) * w->interval;	1034	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
449	assert (("periodic timeout in the past, negative interval?", w->at > ev_now));	1035	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
450	downheap ((WT *)periodics, periodiccnt, 0);	1036	downheap ((WT *)periodics, periodiccnt, 0);
451	}	1037	}
452	else	1038	else
453	evperiodic_stop (w); /* nonrepeating: stop timer */	1039	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
454		1040
455	event ((W)w, EV_TIMEOUT);	1041	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
456	}	1042	}
457	}	1043	}
458		1044
459	static void	1045	static void
460	time_jump (ev_tstamp diff)	1046	periodics_reschedule (EV_P)
461	{	1047	{
462	int i;	1048	int i;
463		1049
464	/* adjust periodics */	1050	/* adjust periodics after time jump */
465	for (i = 0; i < periodiccnt; ++i)	1051	for (i = 0; i < periodiccnt; ++i)
466	{	1052	{
467	struct ev_periodic *w = periodics [i];	1053	struct ev_periodic *w = periodics [i];
468		1054
		1055	if (w->reschedule_cb)
		1056	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
469	if (w->interval)	1057	else if (w->interval)
		1058	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1059	}
		1060
		1061	/* now rebuild the heap */
		1062	for (i = periodiccnt >> 1; i--; )
		1063	downheap ((WT *)periodics, periodiccnt, i);
		1064	}
		1065	#endif
		1066
		1067	inline int
		1068	time_update_monotonic (EV_P)
		1069	{
		1070	mn_now = get_clock ();
		1071
		1072	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1073	{
		1074	ev_rt_now = rtmn_diff + mn_now;
		1075	return 0;
		1076	}
		1077	else
		1078	{
		1079	now_floor = mn_now;
		1080	ev_rt_now = ev_time ();
		1081	return 1;
		1082	}
		1083	}
		1084
		1085	static void
		1086	time_update (EV_P)
		1087	{
		1088	int i;
		1089
		1090	#if EV_USE_MONOTONIC
		1091	if (expect_true (have_monotonic))
		1092	{
		1093	if (time_update_monotonic (EV_A))
470	{	1094	{
471	ev_tstamp diff = ceil ((ev_now - w->at) / w->interval) * w->interval;	1095	ev_tstamp odiff = rtmn_diff;
472		1096
473	if (fabs (diff) >= 1e-4)	1097	for (i = 4; --i; ) /* loop a few times, before making important decisions */
474	{	1098	{
475	evperiodic_stop (w);	1099	rtmn_diff = ev_rt_now - mn_now;
476	evperiodic_start (w);
477		1100
478	i = 0; /* restart loop, inefficient, but time jumps should be rare */	1101	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1102	return; /* all is well */
		1103
		1104	ev_rt_now = ev_time ();
		1105	mn_now = get_clock ();
		1106	now_floor = mn_now;
479	}	1107	}
		1108
		1109	# if EV_PERIODICS
		1110	periodics_reschedule (EV_A);
		1111	# endif
		1112	/* no timer adjustment, as the monotonic clock doesn't jump */
		1113	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
480	}	1114	}
481	}	1115	}
482		1116	else
483	/* adjust timers. this is easy, as the offset is the same for all */	1117	#endif
484	for (i = 0; i < timercnt; ++i)	1118	{
485	timers [i]->at += diff;
486	}
487
488	static void
489	time_update ()
490	{
491	int i;
492
493	ev_now = ev_time ();	1119	ev_rt_now = ev_time ();
494		1120
495	if (have_monotonic)	1121	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
496	{
497	ev_tstamp odiff = diff;
498
499	for (i = 4; --i; ) /* loop a few times, before making important decisions */
500	{	1122	{
501	now = get_clock ();	1123	#if EV_PERIODICS
502	diff = ev_now - now;	1124	periodics_reschedule (EV_A);
		1125	#endif
503		1126
504	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1127	/* adjust timers. this is easy, as the offset is the same for all */
505	return; /* all is well */	1128	for (i = 0; i < timercnt; ++i)
506		1129	((WT)timers [i])->at += ev_rt_now - mn_now;
507	ev_now = ev_time ();
508	}	1130	}
509		1131
510	time_jump (diff - odiff);
511	}
512	else
513	{
514	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
515	time_jump (ev_now - now);
516
517	now = ev_now;	1132	mn_now = ev_rt_now;
518	}	1133	}
519	}	1134	}
520		1135
521	int ev_loop_done;	1136	void
		1137	ev_ref (EV_P)
		1138	{
		1139	++activecnt;
		1140	}
522		1141
		1142	void
		1143	ev_unref (EV_P)
		1144	{
		1145	--activecnt;
		1146	}
		1147
		1148	static int loop_done;
		1149
		1150	void
523	void ev_loop (int flags)	1151	ev_loop (EV_P_ int flags)
524	{	1152	{
525	double block;	1153	double block;
526	ev_loop_done = flags & EVLOOP_ONESHOT;	1154	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
527
528	if (checkcnt)
529	{
530	queue_events ((W *)checks, checkcnt, EV_CHECK);
531	call_pending ();
532	}
533		1155
534	do	1156	do
535	{	1157	{
		1158	/* queue check watchers (and execute them) */
		1159	if (expect_false (preparecnt))
		1160	{
		1161	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1162	call_pending (EV_A);
		1163	}
		1164
		1165	/* we might have forked, so reify kernel state if necessary */
		1166	if (expect_false (postfork))
		1167	loop_fork (EV_A);
		1168
536	/* update fd-related kernel structures */	1169	/* update fd-related kernel structures */
537	fd_reify ();	1170	fd_reify (EV_A);
538		1171
539	/* calculate blocking time */	1172	/* calculate blocking time */
540		1173
541	/* we only need this for !monotonic clock, but as we always have timers, we just calculate it every time */	1174	/* we only need this for !monotonic clock or timers, but as we basically
		1175	always have timers, we just calculate it always */
		1176	#if EV_USE_MONOTONIC
		1177	if (expect_true (have_monotonic))
		1178	time_update_monotonic (EV_A);
		1179	else
		1180	#endif
		1181	{
542	ev_now = ev_time ();	1182	ev_rt_now = ev_time ();
		1183	mn_now = ev_rt_now;
		1184	}
543		1185
544	if (flags & EVLOOP_NONBLOCK || idlecnt)	1186	if (flags & EVLOOP_NONBLOCK || idlecnt)
545	block = 0.;	1187	block = 0.;
546	else	1188	else
547	{	1189	{
548	block = MAX_BLOCKTIME;	1190	block = MAX_BLOCKTIME;
549		1191
550	if (timercnt)	1192	if (timercnt)
551	{	1193	{
552	ev_tstamp to = timers [0]->at - get_clock () + method_fudge;	1194	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
553	if (block > to) block = to;	1195	if (block > to) block = to;
554	}	1196	}
555		1197
		1198	#if EV_PERIODICS
556	if (periodiccnt)	1199	if (periodiccnt)
557	{	1200	{
558	ev_tstamp to = periodics [0]->at - ev_now + method_fudge;	1201	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + method_fudge;
559	if (block > to) block = to;	1202	if (block > to) block = to;
560	}	1203	}
		1204	#endif
561		1205
562	if (block < 0.) block = 0.;	1206	if (block < 0.) block = 0.;
563	}	1207	}
564		1208
565	method_poll (block);	1209	method_poll (EV_A_ block);
566		1210
567	/* update ev_now, do magic */	1211	/* update ev_rt_now, do magic */
568	time_update ();	1212	time_update (EV_A);
569		1213
570	/* queue pending timers and reschedule them */	1214	/* queue pending timers and reschedule them */
		1215	timers_reify (EV_A); /* relative timers called last */
		1216	#if EV_PERIODICS
571	periodics_reify (); /* absolute timers first */	1217	periodics_reify (EV_A); /* absolute timers called first */
572	timers_reify (); /* relative timers second */	1218	#endif
573		1219
574	/* queue idle watchers unless io or timers are pending */	1220	/* queue idle watchers unless io or timers are pending */
575	if (!pendingcnt)	1221	if (idlecnt && !any_pending (EV_A))
576	queue_events ((W *)idles, idlecnt, EV_IDLE);	1222	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
577		1223
578	/* queue check and possibly idle watchers */	1224	/* queue check watchers, to be executed first */
		1225	if (checkcnt)
579	queue_events ((W *)checks, checkcnt, EV_CHECK);	1226	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
580		1227
581	call_pending ();	1228	call_pending (EV_A);
582	}	1229	}
583	while (!ev_loop_done);	1230	while (activecnt && !loop_done);
		1231
		1232	if (loop_done != 2)
		1233	loop_done = 0;
		1234	}
		1235
		1236	void
		1237	ev_unloop (EV_P_ int how)
		1238	{
		1239	loop_done = how;
584	}	1240	}
585		1241
586	/*****************************************************************************/	1242	/*****************************************************************************/
587		1243
588	static void	1244	inline void
589	wlist_add (WL *head, WL elem)	1245	wlist_add (WL *head, WL elem)
590	{	1246	{
591	elem->next = *head;	1247	elem->next = *head;
592	*head = elem;	1248	*head = elem;
593	}	1249	}
594		1250
595	static void	1251	inline void
596	wlist_del (WL *head, WL elem)	1252	wlist_del (WL *head, WL elem)
597	{	1253	{
598	while (*head)	1254	while (*head)
599	{	1255	{
600	if (*head == elem)	1256	if (*head == elem)
…		…
605		1261
606	head = &(*head)->next;	1262	head = &(*head)->next;
607	}	1263	}
608	}	1264	}
609		1265
610	static void	1266	inline void
		1267	ev_clear_pending (EV_P_ W w)
		1268	{
		1269	if (w->pending)
		1270	{
		1271	pendings [ABSPRI (w)][w->pending - 1].w = 0;
		1272	w->pending = 0;
		1273	}
		1274	}
		1275
		1276	inline void
611	ev_start (W w, int active)	1277	ev_start (EV_P_ W w, int active)
612	{	1278	{
613	w->pending = 0;	1279	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1280	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1281
614	w->active = active;	1282	w->active = active;
		1283	ev_ref (EV_A);
615	}	1284	}
616		1285
617	static void	1286	inline void
618	ev_stop (W w)	1287	ev_stop (EV_P_ W w)
619	{	1288	{
620	if (w->pending)	1289	ev_unref (EV_A);
621	pendings [w->pending - 1].w = 0;
622
623	w->active = 0;	1290	w->active = 0;
624	}	1291	}
625		1292
626	/*****************************************************************************/	1293	/*****************************************************************************/
627		1294
628	void	1295	void
629	evio_start (struct ev_io *w)	1296	ev_io_start (EV_P_ struct ev_io *w)
630	{	1297	{
		1298	int fd = w->fd;
		1299
631	if (ev_is_active (w))	1300	if (ev_is_active (w))
632	return;	1301	return;
633		1302
634	int fd = w->fd;	1303	assert (("ev_io_start called with negative fd", fd >= 0));
635		1304
636	ev_start ((W)w, 1);	1305	ev_start (EV_A_ (W)w, 1);
637	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1306	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
638	wlist_add ((WL *)&anfds[fd].head, (WL)w);	1307	wlist_add ((WL *)&anfds[fd].head, (WL)w);
639		1308
640	++fdchangecnt;	1309	fd_change (EV_A_ fd);
641	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
642	fdchanges [fdchangecnt - 1] = fd;
643	}	1310	}
644		1311
645	void	1312	void
646	evio_stop (struct ev_io *w)	1313	ev_io_stop (EV_P_ struct ev_io *w)
647	{	1314	{
		1315	ev_clear_pending (EV_A_ (W)w);
648	if (!ev_is_active (w))	1316	if (!ev_is_active (w))
649	return;	1317	return;
650		1318
		1319	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1320
651	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);	1321	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
652	ev_stop ((W)w);	1322	ev_stop (EV_A_ (W)w);
653		1323
654	++fdchangecnt;	1324	fd_change (EV_A_ w->fd);
655	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
656	fdchanges [fdchangecnt - 1] = w->fd;
657	}	1325	}
658		1326
659
660	void	1327	void
661	evtimer_start (struct ev_timer *w)	1328	ev_timer_start (EV_P_ struct ev_timer *w)
662	{	1329	{
663	if (ev_is_active (w))	1330	if (ev_is_active (w))
664	return;	1331	return;
665		1332
666	w->at += now;	1333	((WT)w)->at += mn_now;
667		1334
		1335	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1336
668	ev_start ((W)w, ++timercnt);	1337	ev_start (EV_A_ (W)w, ++timercnt);
669	array_needsize (timers, timermax, timercnt, );	1338	array_needsize (struct ev_timer *, timers, timermax, timercnt, (void));
670	timers [timercnt - 1] = w;	1339	timers [timercnt - 1] = w;
671	upheap ((WT *)timers, timercnt - 1);	1340	upheap ((WT *)timers, timercnt - 1);
672	}
673		1341
		1342	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1343	}
		1344
674	void	1345	void
675	evtimer_stop (struct ev_timer *w)	1346	ev_timer_stop (EV_P_ struct ev_timer *w)
676	{	1347	{
		1348	ev_clear_pending (EV_A_ (W)w);
677	if (!ev_is_active (w))	1349	if (!ev_is_active (w))
678	return;	1350	return;
679		1351
		1352	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1353
680	if (w->active < timercnt--)	1354	if (((W)w)->active < timercnt--)
681	{	1355	{
682	timers [w->active - 1] = timers [timercnt];	1356	timers [((W)w)->active - 1] = timers [timercnt];
683	downheap ((WT *)timers, timercnt, w->active - 1);	1357	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
684	}	1358	}
685		1359
		1360	((WT)w)->at -= mn_now;
		1361
686	ev_stop ((W)w);	1362	ev_stop (EV_A_ (W)w);
687	}	1363	}
688		1364
689	void	1365	void
690	evperiodic_start (struct ev_periodic *w)	1366	ev_timer_again (EV_P_ struct ev_timer *w)
691	{	1367	{
692	if (ev_is_active (w))	1368	if (ev_is_active (w))
693	return;	1369	{
		1370	if (w->repeat)
		1371	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1, mn_now + w->repeat);
		1372	else
		1373	ev_timer_stop (EV_A_ w);
		1374	}
		1375	else if (w->repeat)
		1376	ev_timer_start (EV_A_ w);
		1377	}
694		1378
		1379	#if EV_PERIODICS
		1380	void
		1381	ev_periodic_start (EV_P_ struct ev_periodic *w)
		1382	{
		1383	if (ev_is_active (w))
		1384	return;
		1385
		1386	if (w->reschedule_cb)
		1387	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1388	else if (w->interval)
		1389	{
		1390	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
695	/* this formula differs from the one in periodic_reify because we do not always round up */	1391	/* this formula differs from the one in periodic_reify because we do not always round up */
696	if (w->interval)
697	w->at += ceil ((ev_now - w->at) / w->interval) * w->interval;	1392	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1393	}
698		1394
699	ev_start ((W)w, ++periodiccnt);	1395	ev_start (EV_A_ (W)w, ++periodiccnt);
700	array_needsize (periodics, periodicmax, periodiccnt, );	1396	array_needsize (struct ev_periodic *, periodics, periodicmax, periodiccnt, (void));
701	periodics [periodiccnt - 1] = w;	1397	periodics [periodiccnt - 1] = w;
702	upheap ((WT *)periodics, periodiccnt - 1);	1398	upheap ((WT *)periodics, periodiccnt - 1);
703	}
704		1399
		1400	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1401	}
		1402
705	void	1403	void
706	evperiodic_stop (struct ev_periodic *w)	1404	ev_periodic_stop (EV_P_ struct ev_periodic *w)
707	{	1405	{
		1406	ev_clear_pending (EV_A_ (W)w);
708	if (!ev_is_active (w))	1407	if (!ev_is_active (w))
709	return;	1408	return;
710		1409
		1410	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1411
711	if (w->active < periodiccnt--)	1412	if (((W)w)->active < periodiccnt--)
712	{	1413	{
713	periodics [w->active - 1] = periodics [periodiccnt];	1414	periodics [((W)w)->active - 1] = periodics [periodiccnt];
714	downheap ((WT *)periodics, periodiccnt, w->active - 1);	1415	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
715	}	1416	}
716		1417
717	ev_stop ((W)w);	1418	ev_stop (EV_A_ (W)w);
718	}	1419	}
719		1420
720	void	1421	void
721	evsignal_start (struct ev_signal *w)	1422	ev_periodic_again (EV_P_ struct ev_periodic *w)
		1423	{
		1424	/* TODO: use adjustheap and recalculation */
		1425	ev_periodic_stop (EV_A_ w);
		1426	ev_periodic_start (EV_A_ w);
		1427	}
		1428	#endif
		1429
		1430	void
		1431	ev_idle_start (EV_P_ struct ev_idle *w)
722	{	1432	{
723	if (ev_is_active (w))	1433	if (ev_is_active (w))
724	return;	1434	return;
725		1435
		1436	ev_start (EV_A_ (W)w, ++idlecnt);
		1437	array_needsize (struct ev_idle *, idles, idlemax, idlecnt, (void));
		1438	idles [idlecnt - 1] = w;
		1439	}
		1440
		1441	void
		1442	ev_idle_stop (EV_P_ struct ev_idle *w)
		1443	{
		1444	ev_clear_pending (EV_A_ (W)w);
		1445	if (ev_is_active (w))
		1446	return;
		1447
		1448	idles [((W)w)->active - 1] = idles [--idlecnt];
		1449	ev_stop (EV_A_ (W)w);
		1450	}
		1451
		1452	void
		1453	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1454	{
		1455	if (ev_is_active (w))
		1456	return;
		1457
		1458	ev_start (EV_A_ (W)w, ++preparecnt);
		1459	array_needsize (struct ev_prepare *, prepares, preparemax, preparecnt, (void));
		1460	prepares [preparecnt - 1] = w;
		1461	}
		1462
		1463	void
		1464	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1465	{
		1466	ev_clear_pending (EV_A_ (W)w);
		1467	if (ev_is_active (w))
		1468	return;
		1469
		1470	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1471	ev_stop (EV_A_ (W)w);
		1472	}
		1473
		1474	void
		1475	ev_check_start (EV_P_ struct ev_check *w)
		1476	{
		1477	if (ev_is_active (w))
		1478	return;
		1479
		1480	ev_start (EV_A_ (W)w, ++checkcnt);
		1481	array_needsize (struct ev_check *, checks, checkmax, checkcnt, (void));
		1482	checks [checkcnt - 1] = w;
		1483	}
		1484
		1485	void
		1486	ev_check_stop (EV_P_ struct ev_check *w)
		1487	{
		1488	ev_clear_pending (EV_A_ (W)w);
		1489	if (!ev_is_active (w))
		1490	return;
		1491
		1492	checks [((W)w)->active - 1] = checks [--checkcnt];
		1493	ev_stop (EV_A_ (W)w);
		1494	}
		1495
		1496	#ifndef SA_RESTART
		1497	# define SA_RESTART 0
		1498	#endif
		1499
		1500	void
		1501	ev_signal_start (EV_P_ struct ev_signal *w)
		1502	{
		1503	#if EV_MULTIPLICITY
		1504	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1505	#endif
		1506	if (ev_is_active (w))
		1507	return;
		1508
		1509	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1510
726	ev_start ((W)w, 1);	1511	ev_start (EV_A_ (W)w, 1);
727	array_needsize (signals, signalmax, w->signum, signals_init);	1512	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
728	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);	1513	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
729		1514
730	if (!w->next)	1515	if (!((WL)w)->next)
731	{	1516	{
		1517	#if WIN32
		1518	signal (w->signum, sighandler);
		1519	#else
732	struct sigaction sa;	1520	struct sigaction sa;
733	sa.sa_handler = sighandler;	1521	sa.sa_handler = sighandler;
734	sigfillset (&sa.sa_mask);	1522	sigfillset (&sa.sa_mask);
735	sa.sa_flags = 0;	1523	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
736	sigaction (w->signum, &sa, 0);	1524	sigaction (w->signum, &sa, 0);
		1525	#endif
737	}	1526	}
738	}	1527	}
739		1528
740	void	1529	void
741	evsignal_stop (struct ev_signal *w)	1530	ev_signal_stop (EV_P_ struct ev_signal *w)
742	{	1531	{
		1532	ev_clear_pending (EV_A_ (W)w);
743	if (!ev_is_active (w))	1533	if (!ev_is_active (w))
744	return;	1534	return;
745		1535
746	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);	1536	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
747	ev_stop ((W)w);	1537	ev_stop (EV_A_ (W)w);
748		1538
749	if (!signals [w->signum - 1].head)	1539	if (!signals [w->signum - 1].head)
750	signal (w->signum, SIG_DFL);	1540	signal (w->signum, SIG_DFL);
751	}	1541	}
752		1542
753	void evidle_start (struct ev_idle *w)	1543	void
		1544	ev_child_start (EV_P_ struct ev_child *w)
754	{	1545	{
		1546	#if EV_MULTIPLICITY
		1547	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1548	#endif
755	if (ev_is_active (w))	1549	if (ev_is_active (w))
756	return;	1550	return;
757		1551
758	ev_start ((W)w, ++idlecnt);	1552	ev_start (EV_A_ (W)w, 1);
759	array_needsize (idles, idlemax, idlecnt, );	1553	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
760	idles [idlecnt - 1] = w;
761	}	1554	}
762		1555
763	void evidle_stop (struct ev_idle *w)	1556	void
		1557	ev_child_stop (EV_P_ struct ev_child *w)
764	{	1558	{
765	idles [w->active - 1] = idles [--idlecnt];	1559	ev_clear_pending (EV_A_ (W)w);
766	ev_stop ((W)w);
767	}
768
769	void evcheck_start (struct ev_check *w)
770	{
771	if (ev_is_active (w))	1560	if (!ev_is_active (w))
772	return;	1561	return;
773		1562
774	ev_start ((W)w, ++checkcnt);	1563	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
775	array_needsize (checks, checkmax, checkcnt, );
776	checks [checkcnt - 1] = w;
777	}
778
779	void evcheck_stop (struct ev_check *w)
780	{
781	checks [w->active - 1] = checks [--checkcnt];
782	ev_stop ((W)w);	1564	ev_stop (EV_A_ (W)w);
783	}	1565	}
784		1566
785	/*****************************************************************************/	1567	/*****************************************************************************/
786		1568
787	#if 1	1569	struct ev_once
788		1570	{
789	struct ev_io wio;	1571	struct ev_io io;
790
791	static void
792	sin_cb (struct ev_io *w, int revents)
793	{
794	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
795	}
796
797	static void
798	ocb (struct ev_timer *w, int revents)
799	{
800	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
801	evtimer_stop (w);
802	evtimer_start (w);
803	}
804
805	static void
806	scb (struct ev_signal *w, int revents)
807	{
808	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
809	evio_stop (&wio);
810	evio_start (&wio);
811	}
812
813	static void
814	gcb (struct ev_signal *w, int revents)
815	{
816	fprintf (stderr, "generic %x\n", revents);
817
818	}
819
820	int main (void)
821	{
822	ev_init (0);
823
824	evio_init (&wio, sin_cb, 0, EV_READ);
825	evio_start (&wio);
826
827	struct ev_timer t[10000];
828
829	#if 0
830	int i;
831	for (i = 0; i < 10000; ++i)
832	{
833	struct ev_timer *w = t + i;
834	evw_init (w, ocb, i);
835	evtimer_init_abs (w, ocb, drand48 (), 0.99775533);
836	evtimer_start (w);
837	if (drand48 () < 0.5)
838	evtimer_stop (w);
839	}
840	#endif
841
842	struct ev_timer t1;	1572	struct ev_timer to;
843	evtimer_init (&t1, ocb, 5, 10);	1573	void (*cb)(int revents, void *arg);
844	evtimer_start (&t1);	1574	void *arg;
		1575	};
845		1576
846	struct ev_signal sig;	1577	static void
847	evsignal_init (&sig, scb, SIGQUIT);	1578	once_cb (EV_P_ struct ev_once *once, int revents)
848	evsignal_start (&sig);	1579	{
		1580	void (*cb)(int revents, void *arg) = once->cb;
		1581	void *arg = once->arg;
849		1582
850	struct ev_check cw;	1583	ev_io_stop (EV_A_ &once->io);
851	evcheck_init (&cw, gcb);	1584	ev_timer_stop (EV_A_ &once->to);
852	evcheck_start (&cw);	1585	ev_free (once);
853		1586
854	struct ev_idle iw;	1587	cb (revents, arg);
855	evidle_init (&iw, gcb);
856	evidle_start (&iw);
857
858	ev_loop (0);
859
860	return 0;
861	}	1588	}
862		1589
863	#endif	1590	static void
		1591	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1592	{
		1593	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1594	}
864		1595
		1596	static void
		1597	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1598	{
		1599	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1600	}
865		1601
		1602	void
		1603	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1604	{
		1605	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
866		1606
		1607	if (!once)
		1608	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1609	else
		1610	{
		1611	once->cb = cb;
		1612	once->arg = arg;
867		1613
		1614	ev_init (&once->io, once_cb_io);
		1615	if (fd >= 0)
		1616	{
		1617	ev_io_set (&once->io, fd, events);
		1618	ev_io_start (EV_A_ &once->io);
		1619	}
		1620
		1621	ev_init (&once->to, once_cb_to);
		1622	if (timeout >= 0.)
		1623	{
		1624	ev_timer_set (&once->to, timeout, 0.);
		1625	ev_timer_start (EV_A_ &once->to);
		1626	}
		1627	}
		1628	}
		1629
		1630	#ifdef __cplusplus
		1631	}
		1632	#endif
		1633

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