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Comparing libev/ev.c (file contents):
Revision 1.6 by root, Tue Oct 30 23:55:29 2007 UTC vs.
Revision 1.67 by root, Mon Nov 5 16:42:15 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#ifndef EV_STANDALONE
		32	# include "config.h"
		33
		34	# if HAVE_CLOCK_GETTIME
		35	# define EV_USE_MONOTONIC 1
		36	# define EV_USE_REALTIME 1
		37	# endif
		38
		39	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		40	# define EV_USE_SELECT 1
		41	# endif
		42
		43	# if HAVE_POLL && HAVE_POLL_H
		44	# define EV_USE_POLL 1
		45	# endif
		46
		47	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		48	# define EV_USE_EPOLL 1
		49	# endif
		50
		51	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		52	# define EV_USE_KQUEUE 1
		53	# endif
		54
		55	#endif
		56
1	#include <math.h>	57	#include <math.h>
2	#include <stdlib.h>	58	#include <stdlib.h>
		59	#include <unistd.h>
		60	#include <fcntl.h>
		61	#include <signal.h>
		62	#include <stddef.h>
3		63
4	#include <stdio.h>	64	#include <stdio.h>
5		65
6	#include <assert.h>	66	#include <assert.h>
7	#include <errno.h>	67	#include <errno.h>
		68	#include <sys/types.h>
		69	#ifndef WIN32
		70	# include <sys/wait.h>
		71	#endif
8	#include <sys/time.h>	72	#include <sys/time.h>
9	#include <time.h>	73	#include <time.h>
10		74
		75	/**/
		76
		77	#ifndef EV_USE_MONOTONIC
		78	# define EV_USE_MONOTONIC 1
		79	#endif
		80
		81	#ifndef EV_USE_SELECT
		82	# define EV_USE_SELECT 1
		83	#endif
		84
		85	#ifndef EV_USE_POLL
		86	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		87	#endif
		88
		89	#ifndef EV_USE_EPOLL
		90	# define EV_USE_EPOLL 0
		91	#endif
		92
		93	#ifndef EV_USE_KQUEUE
		94	# define EV_USE_KQUEUE 0
		95	#endif
		96
		97	#ifndef EV_USE_WIN32
		98	# ifdef WIN32
		99	# define EV_USE_WIN32 1
		100	# else
		101	# define EV_USE_WIN32 0
		102	# endif
		103	#endif
		104
		105	#ifndef EV_USE_REALTIME
		106	# define EV_USE_REALTIME 1
		107	#endif
		108
		109	/**/
		110
11	#ifdef CLOCK_MONOTONIC	111	#ifndef CLOCK_MONOTONIC
		112	# undef EV_USE_MONOTONIC
12	# define HAVE_MONOTONIC 1	113	# define EV_USE_MONOTONIC 0
13	#endif	114	#endif
14		115
		116	#ifndef CLOCK_REALTIME
		117	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	118	# define EV_USE_REALTIME 0
16	#define HAVE_EPOLL 1	119	#endif
17	#define HAVE_SELECT 1	120
		121	/**/
18		122
19	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	123	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
20	#define MAX_BLOCKTIME 60.	124	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		125	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		126	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
21		127
22	#include "ev.h"	128	#include "ev.h"
23		129
		130	#if __GNUC__ >= 3
		131	# define expect(expr,value) __builtin_expect ((expr),(value))
		132	# define inline inline
		133	#else
		134	# define expect(expr,value) (expr)
		135	# define inline static
		136	#endif
		137
		138	#define expect_false(expr) expect ((expr) != 0, 0)
		139	#define expect_true(expr) expect ((expr) != 0, 1)
		140
		141	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		142	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		143
24	struct ev_watcher {	144	typedef struct ev_watcher *W;
25	EV_WATCHER (ev_watcher);	145	typedef struct ev_watcher_list *WL;
		146	typedef struct ev_watcher_time *WT;
		147
		148	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		149
		150	#if WIN32
		151	/* note: the comment below could not be substantiated, but what would I care */
		152	/* MSDN says this is required to handle SIGFPE */
		153	volatile double SIGFPE_REQ = 0.0f;
		154	#endif
		155
		156	/*****************************************************************************/
		157
		158	typedef struct
		159	{
		160	struct ev_watcher_list *head;
		161	unsigned char events;
		162	unsigned char reify;
		163	} ANFD;
		164
		165	typedef struct
		166	{
		167	W w;
		168	int events;
		169	} ANPENDING;
		170
		171	#if EV_MULTIPLICITY
		172
		173	struct ev_loop
		174	{
		175	# define VAR(name,decl) decl;
		176	# include "ev_vars.h"
26	};	177	};
		178	# undef VAR
		179	# include "ev_wrap.h"
27		180
28	struct ev_watcher_list {	181	#else
29	EV_WATCHER_LIST (ev_watcher_list);
30	};
31		182
32	static ev_tstamp now, diff; /* monotonic clock */	183	# define VAR(name,decl) static decl;
33	ev_tstamp ev_now;	184	# include "ev_vars.h"
34	int ev_method;	185	# undef VAR
35		186
36	static int have_monotonic; /* runtime */	187	#endif
37		188
38	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	189	/*****************************************************************************/
39	static void (*method_modify)(int fd, int oev, int nev);
40	static void (*method_poll)(ev_tstamp timeout);
41		190
42	ev_tstamp	191	inline ev_tstamp
43	ev_time (void)	192	ev_time (void)
44	{	193	{
45	#if HAVE_REALTIME	194	#if EV_USE_REALTIME
46	struct timespec ts;	195	struct timespec ts;
47	clock_gettime (CLOCK_REALTIME, &ts);	196	clock_gettime (CLOCK_REALTIME, &ts);
48	return ts.tv_sec + ts.tv_nsec * 1e-9;	197	return ts.tv_sec + ts.tv_nsec * 1e-9;
49	#else	198	#else
50	struct timeval tv;	199	struct timeval tv;
51	gettimeofday (&tv, 0);	200	gettimeofday (&tv, 0);
52	return tv.tv_sec + tv.tv_usec * 1e-6;	201	return tv.tv_sec + tv.tv_usec * 1e-6;
53	#endif	202	#endif
54	}	203	}
55		204
56	static ev_tstamp	205	inline ev_tstamp
57	get_clock (void)	206	get_clock (void)
58	{	207	{
59	#if HAVE_MONOTONIC	208	#if EV_USE_MONOTONIC
60	if (have_monotonic)	209	if (expect_true (have_monotonic))
61	{	210	{
62	struct timespec ts;	211	struct timespec ts;
63	clock_gettime (CLOCK_MONOTONIC, &ts);	212	clock_gettime (CLOCK_MONOTONIC, &ts);
64	return ts.tv_sec + ts.tv_nsec * 1e-9;	213	return ts.tv_sec + ts.tv_nsec * 1e-9;
65	}	214	}
66	#endif	215	#endif
67		216
68	return ev_time ();	217	return ev_time ();
69	}	218	}
70		219
		220	ev_tstamp
		221	ev_now (EV_P)
		222	{
		223	return rt_now;
		224	}
		225
		226	#define array_roundsize(base,n) ((n) | 4 & ~3)
		227
71	#define array_needsize(base,cur,cnt,init) \	228	#define array_needsize(base,cur,cnt,init) \
72	if ((cnt) > cur) \	229	if (expect_false ((cnt) > cur)) \
73	{ \	230	{ \
74	int newcnt = cur ? cur << 1 : 16; \	231	int newcnt = cur; \
75	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	232	do \
		233	{ \
		234	newcnt = array_roundsize (base, newcnt << 1); \
		235	} \
		236	while ((cnt) > newcnt); \
		237	\
76	base = realloc (base, sizeof (*base) * (newcnt)); \	238	base = realloc (base, sizeof (*base) * (newcnt)); \
77	init (base + cur, newcnt - cur); \	239	init (base + cur, newcnt - cur); \
78	cur = newcnt; \	240	cur = newcnt; \
79	}	241	}
80		242
81	typedef struct	243	#define array_slim(stem) \
82	{	244	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
83	struct ev_io *head;	245	{ \
84	unsigned char wev, rev; /* want, received event set */	246	stem ## max = array_roundsize (stem ## cnt >> 1); \
85	} ANFD;	247	base = realloc (base, sizeof (*base) * (stem ## max)); \
		248	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		249	}
86		250
87	static ANFD *anfds;	251	#define array_free(stem, idx) \
88	static int anfdmax;	252	free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
89		253
90	static int *fdchanges;	254	/*****************************************************************************/
91	static int fdchangemax, fdchangecnt;
92		255
93	static void	256	static void
94	anfds_init (ANFD *base, int count)	257	anfds_init (ANFD *base, int count)
95	{	258	{
96	while (count--)	259	while (count--)
97	{	260	{
98	base->head = 0;	261	base->head = 0;
99	base->wev = base->rev = EV_NONE;	262	base->events = EV_NONE;
		263	base->reify = 0;
		264
100	++base;	265	++base;
101	}	266	}
102	}	267	}
103		268
104	typedef struct
105	{
106	struct ev_watcher *w;
107	int events;
108	} ANPENDING;
109
110	static ANPENDING *pendings;
111	static int pendingmax, pendingcnt;
112
113	static void	269	static void
114	event (struct ev_watcher *w, int events)	270	event (EV_P_ W w, int events)
115	{	271	{
		272	if (w->pending)
		273	{
		274	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		275	return;
		276	}
		277
116	w->pending = ++pendingcnt;	278	w->pending = ++pendingcnt [ABSPRI (w)];
117	array_needsize (pendings, pendingmax, pendingcnt, );	279	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], );
118	pendings [pendingcnt - 1].w = w;	280	pendings [ABSPRI (w)][w->pending - 1].w = w;
119	pendings [pendingcnt - 1].events = events;	281	pendings [ABSPRI (w)][w->pending - 1].events = events;
120	}	282	}
121		283
122	static void	284	static void
		285	queue_events (EV_P_ W *events, int eventcnt, int type)
		286	{
		287	int i;
		288
		289	for (i = 0; i < eventcnt; ++i)
		290	event (EV_A_ events [i], type);
		291	}
		292
		293	static void
123	fd_event (int fd, int events)	294	fd_event (EV_P_ int fd, int events)
124	{	295	{
125	ANFD *anfd = anfds + fd;	296	ANFD *anfd = anfds + fd;
126	struct ev_io *w;	297	struct ev_io *w;
127		298
128	for (w = anfd->head; w; w = w->next)	299	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
129	{	300	{
130	int ev = w->events & events;	301	int ev = w->events & events;
131		302
132	if (ev)	303	if (ev)
133	event ((struct ev_watcher *)w, ev);	304	event (EV_A_ (W)w, ev);
134	}
135	}
136
137	static struct ev_timer **atimers;
138	static int atimermax, atimercnt;
139
140	static struct ev_timer **rtimers;
141	static int rtimermax, rtimercnt;
142
143	static void
144	upheap (struct ev_timer **timers, int k)
145	{
146	struct ev_timer *w = timers [k];
147
148	while (k && timers [k >> 1]->at > w->at)
149	{	305	}
150	timers [k] = timers [k >> 1];
151	timers [k]->active = k + 1;
152	k >>= 1;
153	}
154
155	timers [k] = w;
156	timers [k]->active = k + 1;
157
158	}	306	}
159		307
160	static void	308	/*****************************************************************************/
161	downheap (struct ev_timer **timers, int N, int k)
162	{
163	struct ev_timer *w = timers [k];
164		309
165	while (k < (N >> 1))
166	{
167	int j = k << 1;
168
169	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
170	++j;
171
172	if (w->at <= timers [j]->at)
173	break;
174
175	timers [k] = timers [j];
176	timers [k]->active = k + 1;
177	k = j;
178	}
179
180	timers [k] = w;
181	timers [k]->active = k + 1;
182	}
183
184	static struct ev_signal **signals;
185	static int signalmax;
186
187	static void	310	static void
188	signals_init (struct ev_signal **base, int count)	311	fd_reify (EV_P)
189	{
190	while (count--)
191	*base++ = 0;
192	}
193
194	#if HAVE_EPOLL
195	# include "ev_epoll.c"
196	#endif
197	#if HAVE_SELECT
198	# include "ev_select.c"
199	#endif
200
201	int ev_init (int flags)
202	{
203	#if HAVE_MONOTONIC
204	{
205	struct timespec ts;
206	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
207	have_monotonic = 1;
208	}
209	#endif
210
211	ev_now = ev_time ();
212	now = get_clock ();
213	diff = ev_now - now;
214
215	#if HAVE_EPOLL
216	if (epoll_init (flags))
217	return ev_method;
218	#endif
219	#if HAVE_SELECT
220	if (select_init (flags))
221	return ev_method;
222	#endif
223
224	ev_method = EVMETHOD_NONE;
225	return ev_method;
226	}
227
228	void ev_prefork (void)
229	{
230	}
231
232	void ev_postfork_parent (void)
233	{
234	}
235
236	void ev_postfork_child (void)
237	{
238	#if HAVE_EPOLL
239	if (ev_method == EVMETHOD_EPOLL)
240	epoll_postfork_child ();
241	#endif
242	}
243
244	static void
245	fd_reify (void)
246	{	312	{
247	int i;	313	int i;
248		314
249	for (i = 0; i < fdchangecnt; ++i)	315	for (i = 0; i < fdchangecnt; ++i)
250	{	316	{
251	int fd = fdchanges [i];	317	int fd = fdchanges [i];
252	ANFD *anfd = anfds + fd;	318	ANFD *anfd = anfds + fd;
253	struct ev_io *w;	319	struct ev_io *w;
254		320
255	int wev = 0;	321	int events = 0;
256		322
257	for (w = anfd->head; w; w = w->next)	323	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
258	wev |= w->events;	324	events |= w->events;
259		325
260	if (anfd->wev != wev)	326	anfd->reify = 0;
		327
		328	method_modify (EV_A_ fd, anfd->events, events);
		329	anfd->events = events;
		330	}
		331
		332	fdchangecnt = 0;
		333	}
		334
		335	static void
		336	fd_change (EV_P_ int fd)
		337	{
		338	if (anfds [fd].reify || fdchangecnt < 0)
		339	return;
		340
		341	anfds [fd].reify = 1;
		342
		343	++fdchangecnt;
		344	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
		345	fdchanges [fdchangecnt - 1] = fd;
		346	}
		347
		348	static void
		349	fd_kill (EV_P_ int fd)
		350	{
		351	struct ev_io *w;
		352
		353	while ((w = (struct ev_io *)anfds [fd].head))
		354	{
		355	ev_io_stop (EV_A_ w);
		356	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		357	}
		358	}
		359
		360	/* called on EBADF to verify fds */
		361	static void
		362	fd_ebadf (EV_P)
		363	{
		364	int fd;
		365
		366	for (fd = 0; fd < anfdmax; ++fd)
		367	if (anfds [fd].events)
		368	if (fcntl (fd, F_GETFD) == -1 && errno == EBADF)
		369	fd_kill (EV_A_ fd);
		370	}
		371
		372	/* called on ENOMEM in select/poll to kill some fds and retry */
		373	static void
		374	fd_enomem (EV_P)
		375	{
		376	int fd;
		377
		378	for (fd = anfdmax; fd--; )
		379	if (anfds [fd].events)
		380	{
		381	close (fd);
		382	fd_kill (EV_A_ fd);
		383	return;
		384	}
		385	}
		386
		387	/* susually called after fork if method needs to re-arm all fds from scratch */
		388	static void
		389	fd_rearm_all (EV_P)
		390	{
		391	int fd;
		392
		393	/* this should be highly optimised to not do anything but set a flag */
		394	for (fd = 0; fd < anfdmax; ++fd)
		395	if (anfds [fd].events)
		396	{
		397	anfds [fd].events = 0;
		398	fd_change (EV_A_ fd);
		399	}
		400	}
		401
		402	/*****************************************************************************/
		403
		404	static void
		405	upheap (WT *heap, int k)
		406	{
		407	WT w = heap [k];
		408
		409	while (k && heap [k >> 1]->at > w->at)
		410	{
		411	heap [k] = heap [k >> 1];
		412	((W)heap [k])->active = k + 1;
		413	k >>= 1;
		414	}
		415
		416	heap [k] = w;
		417	((W)heap [k])->active = k + 1;
		418
		419	}
		420
		421	static void
		422	downheap (WT *heap, int N, int k)
		423	{
		424	WT w = heap [k];
		425
		426	while (k < (N >> 1))
		427	{
		428	int j = k << 1;
		429
		430	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		431	++j;
		432
		433	if (w->at <= heap [j]->at)
		434	break;
		435
		436	heap [k] = heap [j];
		437	((W)heap [k])->active = k + 1;
		438	k = j;
		439	}
		440
		441	heap [k] = w;
		442	((W)heap [k])->active = k + 1;
		443	}
		444
		445	/*****************************************************************************/
		446
		447	typedef struct
		448	{
		449	struct ev_watcher_list *head;
		450	sig_atomic_t volatile gotsig;
		451	} ANSIG;
		452
		453	static ANSIG *signals;
		454	static int signalmax;
		455
		456	static int sigpipe [2];
		457	static sig_atomic_t volatile gotsig;
		458	static struct ev_io sigev;
		459
		460	static void
		461	signals_init (ANSIG *base, int count)
		462	{
		463	while (count--)
		464	{
		465	base->head = 0;
		466	base->gotsig = 0;
		467
		468	++base;
		469	}
		470	}
		471
		472	static void
		473	sighandler (int signum)
		474	{
		475	#if WIN32
		476	signal (signum, sighandler);
		477	#endif
		478
		479	signals [signum - 1].gotsig = 1;
		480
		481	if (!gotsig)
		482	{
		483	int old_errno = errno;
		484	gotsig = 1;
		485	write (sigpipe [1], &signum, 1);
		486	errno = old_errno;
		487	}
		488	}
		489
		490	static void
		491	sigcb (EV_P_ struct ev_io *iow, int revents)
		492	{
		493	struct ev_watcher_list *w;
		494	int signum;
		495
		496	read (sigpipe [0], &revents, 1);
		497	gotsig = 0;
		498
		499	for (signum = signalmax; signum--; )
		500	if (signals [signum].gotsig)
		501	{
		502	signals [signum].gotsig = 0;
		503
		504	for (w = signals [signum].head; w; w = w->next)
		505	event (EV_A_ (W)w, EV_SIGNAL);
		506	}
		507	}
		508
		509	static void
		510	siginit (EV_P)
		511	{
		512	#ifndef WIN32
		513	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
		514	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
		515
		516	/* rather than sort out wether we really need nb, set it */
		517	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
		518	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		519	#endif
		520
		521	ev_io_set (&sigev, sigpipe [0], EV_READ);
		522	ev_io_start (EV_A_ &sigev);
		523	ev_unref (EV_A); /* child watcher should not keep loop alive */
		524	}
		525
		526	/*****************************************************************************/
		527
		528	#ifndef WIN32
		529
		530	static struct ev_child *childs [PID_HASHSIZE];
		531	static struct ev_signal childev;
		532
		533	#ifndef WCONTINUED
		534	# define WCONTINUED 0
		535	#endif
		536
		537	static void
		538	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		539	{
		540	struct ev_child *w;
		541
		542	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		543	if (w->pid == pid || !w->pid)
		544	{
		545	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		546	w->rpid = pid;
		547	w->rstatus = status;
		548	event (EV_A_ (W)w, EV_CHILD);
		549	}
		550	}
		551
		552	static void
		553	childcb (EV_P_ struct ev_signal *sw, int revents)
		554	{
		555	int pid, status;
		556
		557	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		558	{
		559	/* make sure we are called again until all childs have been reaped */
		560	event (EV_A_ (W)sw, EV_SIGNAL);
		561
		562	child_reap (EV_A_ sw, pid, pid, status);
		563	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		564	}
		565	}
		566
		567	#endif
		568
		569	/*****************************************************************************/
		570
		571	#if EV_USE_KQUEUE
		572	# include "ev_kqueue.c"
		573	#endif
		574	#if EV_USE_EPOLL
		575	# include "ev_epoll.c"
		576	#endif
		577	#if EV_USE_POLL
		578	# include "ev_poll.c"
		579	#endif
		580	#if EV_USE_SELECT
		581	# include "ev_select.c"
		582	#endif
		583
		584	int
		585	ev_version_major (void)
		586	{
		587	return EV_VERSION_MAJOR;
		588	}
		589
		590	int
		591	ev_version_minor (void)
		592	{
		593	return EV_VERSION_MINOR;
		594	}
		595
		596	/* return true if we are running with elevated privileges and should ignore env variables */
		597	static int
		598	enable_secure (void)
		599	{
		600	#ifdef WIN32
		601	return 0;
		602	#else
		603	return getuid () != geteuid ()
		604	|| getgid () != getegid ();
		605	#endif
		606	}
		607
		608	int
		609	ev_method (EV_P)
		610	{
		611	return method;
		612	}
		613
		614	static void
		615	loop_init (EV_P_ int methods)
		616	{
		617	if (!method)
		618	{
		619	#if EV_USE_MONOTONIC
		620	{
		621	struct timespec ts;
		622	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
		623	have_monotonic = 1;
		624	}
		625	#endif
		626
		627	rt_now = ev_time ();
		628	mn_now = get_clock ();
		629	now_floor = mn_now;
		630	rtmn_diff = rt_now - mn_now;
		631
		632	if (methods == EVMETHOD_AUTO)
		633	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		634	methods = atoi (getenv ("LIBEV_METHODS"));
		635	else
		636	methods = EVMETHOD_ANY;
		637
		638	method = 0;
		639	#if EV_USE_WIN32
		640	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		641	#endif
		642	#if EV_USE_KQUEUE
		643	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		644	#endif
		645	#if EV_USE_EPOLL
		646	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		647	#endif
		648	#if EV_USE_POLL
		649	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		650	#endif
		651	#if EV_USE_SELECT
		652	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		653	#endif
		654	}
		655	}
		656
		657	void
		658	loop_destroy (EV_P)
		659	{
		660	int i;
		661
		662	#if EV_USE_WIN32
		663	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		664	#endif
		665	#if EV_USE_KQUEUE
		666	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		667	#endif
		668	#if EV_USE_EPOLL
		669	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		670	#endif
		671	#if EV_USE_POLL
		672	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		673	#endif
		674	#if EV_USE_SELECT
		675	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		676	#endif
		677
		678	for (i = NUMPRI; i--; )
		679	array_free (pending, [i]);
		680
		681	array_free (fdchange, );
		682	array_free (timer, );
		683	array_free (periodic, );
		684	array_free (idle, );
		685	array_free (prepare, );
		686	array_free (check, );
		687
		688	method = 0;
		689	/*TODO*/
		690	}
		691
		692	void
		693	loop_fork (EV_P)
		694	{
		695	/*TODO*/
		696	#if EV_USE_EPOLL
		697	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		698	#endif
		699	#if EV_USE_KQUEUE
		700	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		701	#endif
		702	}
		703
		704	#if EV_MULTIPLICITY
		705	struct ev_loop *
		706	ev_loop_new (int methods)
		707	{
		708	struct ev_loop *loop = (struct ev_loop *)calloc (1, sizeof (struct ev_loop));
		709
		710	loop_init (EV_A_ methods);
		711
		712	if (ev_method (EV_A))
		713	return loop;
		714
		715	return 0;
		716	}
		717
		718	void
		719	ev_loop_destroy (EV_P)
		720	{
		721	loop_destroy (EV_A);
		722	free (loop);
		723	}
		724
		725	void
		726	ev_loop_fork (EV_P)
		727	{
		728	loop_fork (EV_A);
		729	}
		730
		731	#endif
		732
		733	#if EV_MULTIPLICITY
		734	struct ev_loop default_loop_struct;
		735	static struct ev_loop *default_loop;
		736
		737	struct ev_loop *
		738	#else
		739	static int default_loop;
		740
		741	int
		742	#endif
		743	ev_default_loop (int methods)
		744	{
		745	if (sigpipe [0] == sigpipe [1])
		746	if (pipe (sigpipe))
		747	return 0;
		748
		749	if (!default_loop)
		750	{
		751	#if EV_MULTIPLICITY
		752	struct ev_loop *loop = default_loop = &default_loop_struct;
		753	#else
		754	default_loop = 1;
		755	#endif
		756
		757	loop_init (EV_A_ methods);
		758
		759	if (ev_method (EV_A))
261	{	760	{
262	method_modify (fd, anfd->wev, wev);	761	ev_watcher_init (&sigev, sigcb);
263	anfd->wev = wev;	762	ev_set_priority (&sigev, EV_MAXPRI);
		763	siginit (EV_A);
		764
		765	#ifndef WIN32
		766	ev_signal_init (&childev, childcb, SIGCHLD);
		767	ev_set_priority (&childev, EV_MAXPRI);
		768	ev_signal_start (EV_A_ &childev);
		769	ev_unref (EV_A); /* child watcher should not keep loop alive */
		770	#endif
264	}	771	}
		772	else
		773	default_loop = 0;
265	}	774	}
266		775
267	fdchangecnt = 0;	776	return default_loop;
268	}	777	}
269		778
		779	void
		780	ev_default_destroy (void)
		781	{
		782	#if EV_MULTIPLICITY
		783	struct ev_loop *loop = default_loop;
		784	#endif
		785
		786	ev_ref (EV_A); /* child watcher */
		787	ev_signal_stop (EV_A_ &childev);
		788
		789	ev_ref (EV_A); /* signal watcher */
		790	ev_io_stop (EV_A_ &sigev);
		791
		792	close (sigpipe [0]); sigpipe [0] = 0;
		793	close (sigpipe [1]); sigpipe [1] = 0;
		794
		795	loop_destroy (EV_A);
		796	}
		797
		798	void
		799	ev_default_fork (void)
		800	{
		801	#if EV_MULTIPLICITY
		802	struct ev_loop *loop = default_loop;
		803	#endif
		804
		805	loop_fork (EV_A);
		806
		807	ev_io_stop (EV_A_ &sigev);
		808	close (sigpipe [0]);
		809	close (sigpipe [1]);
		810	pipe (sigpipe);
		811
		812	ev_ref (EV_A); /* signal watcher */
		813	siginit (EV_A);
		814	}
		815
		816	/*****************************************************************************/
		817
270	static void	818	static void
271	call_pending ()	819	call_pending (EV_P)
272	{	820	{
273	int i;	821	int pri;
274		822
275	for (i = 0; i < pendingcnt; ++i)	823	for (pri = NUMPRI; pri--; )
		824	while (pendingcnt [pri])
276	{	825	{
277	ANPENDING *p = pendings + i;	826	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
278		827
279	if (p->w)	828	if (p->w)
280	{	829	{
281	p->w->pending = 0;	830	p->w->pending = 0;
282	p->w->cb (p->w, p->events);	831	p->w->cb (EV_A_ p->w, p->events);
283	}	832	}
284	}	833	}
285
286	pendingcnt = 0;
287	}	834	}
288		835
289	static void	836	static void
290	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	837	timers_reify (EV_P)
291	{	838	{
292	while (timercnt && timers [0]->at <= now)	839	while (timercnt && ((WT)timers [0])->at <= mn_now)
293	{	840	{
294	struct ev_timer *w = timers [0];	841	struct ev_timer *w = timers [0];
		842
		843	assert (("inactive timer on timer heap detected", ev_is_active (w)));
295		844
296	/* first reschedule or stop timer */	845	/* first reschedule or stop timer */
297	if (w->repeat)	846	if (w->repeat)
298	{	847	{
299	if (w->is_abs)	848	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
300	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
301	else
302	w->at = now + w->repeat;	849	((WT)w)->at = mn_now + w->repeat;
303
304	assert (w->at > now);
305
306	downheap (timers, timercnt, 0);	850	downheap ((WT *)timers, timercnt, 0);
307	}	851	}
308	else	852	else
		853	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		854
		855	event (EV_A_ (W)w, EV_TIMEOUT);
		856	}
		857	}
		858
		859	static void
		860	periodics_reify (EV_P)
		861	{
		862	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		863	{
		864	struct ev_periodic *w = periodics [0];
		865
		866	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		867
		868	/* first reschedule or stop timer */
		869	if (w->interval)
309	{	870	{
310	evtimer_stop (w); /* nonrepeating: stop timer */	871	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
311	--timercnt; /* maybe pass by reference instead? */	872	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		873	downheap ((WT *)periodics, periodiccnt, 0);
312	}	874	}
		875	else
		876	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
313		877
314	event ((struct ev_watcher *)w, EV_TIMEOUT);	878	event (EV_A_ (W)w, EV_PERIODIC);
315	}	879	}
316	}	880	}
317		881
318	static void	882	static void
319	time_update ()	883	periodics_reschedule (EV_P)
320	{	884	{
321	int i;	885	int i;
322	ev_now = ev_time ();
323		886
324	if (have_monotonic)	887	/* adjust periodics after time jump */
		888	for (i = 0; i < periodiccnt; ++i)
325	{	889	{
326	ev_tstamp odiff = diff;	890	struct ev_periodic *w = periodics [i];
327		891
328	/* detecting time jumps is much more difficult */	892	if (w->interval)
329	for (i = 2; --i; ) /* loop a few times, before making important decisions */
330	{	893	{
331	now = get_clock ();	894	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
332	diff = ev_now - now;
333		895
334	if (fabs (odiff - diff) < MIN_TIMEJUMP)	896	if (fabs (diff) >= 1e-4)
335	return; /* all is well */	897	{
		898	ev_periodic_stop (EV_A_ w);
		899	ev_periodic_start (EV_A_ w);
336		900
337	ev_now = ev_time ();	901	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		902	}
338	}	903	}
		904	}
		905	}
339		906
340	/* time jump detected, reschedule atimers */	907	inline int
341	for (i = 0; i < atimercnt; ++i)	908	time_update_monotonic (EV_P)
		909	{
		910	mn_now = get_clock ();
		911
		912	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		913	{
		914	rt_now = rtmn_diff + mn_now;
		915	return 0;
		916	}
		917	else
		918	{
		919	now_floor = mn_now;
		920	rt_now = ev_time ();
		921	return 1;
		922	}
		923	}
		924
		925	static void
		926	time_update (EV_P)
		927	{
		928	int i;
		929
		930	#if EV_USE_MONOTONIC
		931	if (expect_true (have_monotonic))
		932	{
		933	if (time_update_monotonic (EV_A))
342	{	934	{
343	struct ev_timer *w = atimers [i];	935	ev_tstamp odiff = rtmn_diff;
344	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	936
		937	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		938	{
		939	rtmn_diff = rt_now - mn_now;
		940
		941	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		942	return; /* all is well */
		943
		944	rt_now = ev_time ();
		945	mn_now = get_clock ();
		946	now_floor = mn_now;
		947	}
		948
		949	periodics_reschedule (EV_A);
		950	/* no timer adjustment, as the monotonic clock doesn't jump */
		951	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
345	}	952	}
346	}	953	}
347	else	954	else
		955	#endif
348	{	956	{
349	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	957	rt_now = ev_time ();
350	/* time jump detected, adjust rtimers */	958
		959	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		960	{
		961	periodics_reschedule (EV_A);
		962
		963	/* adjust timers. this is easy, as the offset is the same for all */
351	for (i = 0; i < rtimercnt; ++i)	964	for (i = 0; i < timercnt; ++i)
352	rtimers [i]->at += ev_now - now;	965	((WT)timers [i])->at += rt_now - mn_now;
		966	}
353		967
354	now = ev_now;	968	mn_now = rt_now;
355	}	969	}
356	}	970	}
357		971
358	int ev_loop_done;	972	void
		973	ev_ref (EV_P)
		974	{
		975	++activecnt;
		976	}
359		977
		978	void
		979	ev_unref (EV_P)
		980	{
		981	--activecnt;
		982	}
		983
		984	static int loop_done;
		985
		986	void
360	void ev_loop (int flags)	987	ev_loop (EV_P_ int flags)
361	{	988	{
362	double block;	989	double block;
363	ev_loop_done = flags & EVLOOP_ONESHOT;	990	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
364		991
365	do	992	do
366	{	993	{
		994	/* queue check watchers (and execute them) */
		995	if (expect_false (preparecnt))
		996	{
		997	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		998	call_pending (EV_A);
		999	}
		1000
367	/* update fd-related kernel structures */	1001	/* update fd-related kernel structures */
368	fd_reify ();	1002	fd_reify (EV_A);
369		1003
370	/* calculate blocking time */	1004	/* calculate blocking time */
		1005
		1006	/* we only need this for !monotonic clockor timers, but as we basically
		1007	always have timers, we just calculate it always */
		1008	#if EV_USE_MONOTONIC
		1009	if (expect_true (have_monotonic))
		1010	time_update_monotonic (EV_A);
		1011	else
		1012	#endif
		1013	{
		1014	rt_now = ev_time ();
		1015	mn_now = rt_now;
		1016	}
		1017
371	if (flags & EVLOOP_NONBLOCK)	1018	if (flags & EVLOOP_NONBLOCK || idlecnt)
372	block = 0.;	1019	block = 0.;
373	else	1020	else
374	{	1021	{
375	block = MAX_BLOCKTIME;	1022	block = MAX_BLOCKTIME;
376		1023
377	if (rtimercnt)	1024	if (timercnt)
378	{	1025	{
379	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1026	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
380	if (block > to) block = to;	1027	if (block > to) block = to;
381	}	1028	}
382		1029
383	if (atimercnt)	1030	if (periodiccnt)
384	{	1031	{
385	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1032	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
386	if (block > to) block = to;	1033	if (block > to) block = to;
387	}	1034	}
388		1035
389	if (block < 0.) block = 0.;	1036	if (block < 0.) block = 0.;
390	}	1037	}
391		1038
392	method_poll (block);	1039	method_poll (EV_A_ block);
393		1040
394	/* update ev_now, do magic */	1041	/* update rt_now, do magic */
395	time_update ();	1042	time_update (EV_A);
396		1043
397	/* put pending timers into pendign queue and reschedule them */	1044	/* queue pending timers and reschedule them */
398	/* absolute timers first */	1045	timers_reify (EV_A); /* relative timers called last */
399	timers_reify (atimers, atimercnt, ev_now);	1046	periodics_reify (EV_A); /* absolute timers called first */
400	/* relative timers second */
401	timers_reify (rtimers, rtimercnt, now);
402		1047
		1048	/* queue idle watchers unless io or timers are pending */
		1049	if (!pendingcnt)
		1050	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1051
		1052	/* queue check watchers, to be executed first */
		1053	if (checkcnt)
		1054	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1055
403	call_pending ();	1056	call_pending (EV_A);
404	}	1057	}
405	while (!ev_loop_done);	1058	while (activecnt && !loop_done);
406	}
407		1059
408	static void	1060	if (loop_done != 2)
409	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1061	loop_done = 0;
		1062	}
		1063
		1064	void
		1065	ev_unloop (EV_P_ int how)
		1066	{
		1067	loop_done = how;
		1068	}
		1069
		1070	/*****************************************************************************/
		1071
		1072	inline void
		1073	wlist_add (WL *head, WL elem)
410	{	1074	{
411	elem->next = *head;	1075	elem->next = *head;
412	*head = elem;	1076	*head = elem;
413	}	1077	}
414		1078
415	static void	1079	inline void
416	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1080	wlist_del (WL *head, WL elem)
417	{	1081	{
418	while (*head)	1082	while (*head)
419	{	1083	{
420	if (*head == elem)	1084	if (*head == elem)
421	{	1085	{
…		…
425		1089
426	head = &(*head)->next;	1090	head = &(*head)->next;
427	}	1091	}
428	}	1092	}
429		1093
430	static void	1094	inline void
431	ev_start (struct ev_watcher *w, int active)	1095	ev_clear_pending (EV_P_ W w)
432	{	1096	{
		1097	if (w->pending)
		1098	{
		1099	pendings [ABSPRI (w)][w->pending - 1].w = 0;
433	w->pending = 0;	1100	w->pending = 0;
		1101	}
		1102	}
		1103
		1104	inline void
		1105	ev_start (EV_P_ W w, int active)
		1106	{
		1107	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1108	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1109
434	w->active = active;	1110	w->active = active;
		1111	ev_ref (EV_A);
435	}	1112	}
436		1113
437	static void	1114	inline void
438	ev_stop (struct ev_watcher *w)	1115	ev_stop (EV_P_ W w)
439	{	1116	{
440	if (w->pending)	1117	ev_unref (EV_A);
441	pendings [w->pending - 1].w = 0;
442
443	w->active = 0;	1118	w->active = 0;
444	/* nop */
445	}	1119	}
446		1120
		1121	/*****************************************************************************/
		1122
447	void	1123	void
448	evio_start (struct ev_io *w)	1124	ev_io_start (EV_P_ struct ev_io *w)
449	{	1125	{
		1126	int fd = w->fd;
		1127
450	if (ev_is_active (w))	1128	if (ev_is_active (w))
451	return;	1129	return;
452		1130
453	int fd = w->fd;	1131	assert (("ev_io_start called with negative fd", fd >= 0));
454		1132
455	ev_start ((struct ev_watcher *)w, 1);	1133	ev_start (EV_A_ (W)w, 1);
456	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1134	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
457	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1135	wlist_add ((WL *)&anfds[fd].head, (WL)w);
458		1136
459	++fdchangecnt;	1137	fd_change (EV_A_ fd);
460	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
461	fdchanges [fdchangecnt - 1] = fd;
462	}	1138	}
463		1139
464	void	1140	void
465	evio_stop (struct ev_io *w)	1141	ev_io_stop (EV_P_ struct ev_io *w)
466	{	1142	{
		1143	ev_clear_pending (EV_A_ (W)w);
467	if (!ev_is_active (w))	1144	if (!ev_is_active (w))
468	return;	1145	return;
469		1146
470	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1147	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
471	ev_stop ((struct ev_watcher *)w);	1148	ev_stop (EV_A_ (W)w);
472		1149
473	++fdchangecnt;	1150	fd_change (EV_A_ w->fd);
474	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
475	fdchanges [fdchangecnt - 1] = w->fd;
476	}	1151	}
477		1152
478	void	1153	void
479	evtimer_start (struct ev_timer *w)	1154	ev_timer_start (EV_P_ struct ev_timer *w)
480	{	1155	{
481	if (ev_is_active (w))	1156	if (ev_is_active (w))
482	return;	1157	return;
483		1158
484	if (w->is_abs)	1159	((WT)w)->at += mn_now;
		1160
		1161	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1162
		1163	ev_start (EV_A_ (W)w, ++timercnt);
		1164	array_needsize (timers, timermax, timercnt, );
		1165	timers [timercnt - 1] = w;
		1166	upheap ((WT *)timers, timercnt - 1);
		1167
		1168	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1169	}
		1170
		1171	void
		1172	ev_timer_stop (EV_P_ struct ev_timer *w)
		1173	{
		1174	ev_clear_pending (EV_A_ (W)w);
		1175	if (!ev_is_active (w))
		1176	return;
		1177
		1178	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1179
		1180	if (((W)w)->active < timercnt--)
		1181	{
		1182	timers [((W)w)->active - 1] = timers [timercnt];
		1183	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
485	{	1184	}
486	/* this formula differs from the one in timer_reify becuse we do not round up */	1185
		1186	((WT)w)->at = w->repeat;
		1187
		1188	ev_stop (EV_A_ (W)w);
		1189	}
		1190
		1191	void
		1192	ev_timer_again (EV_P_ struct ev_timer *w)
		1193	{
		1194	if (ev_is_active (w))
		1195	{
487	if (w->repeat)	1196	if (w->repeat)
488	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1197	{
		1198	((WT)w)->at = mn_now + w->repeat;
		1199	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1200	}
		1201	else
		1202	ev_timer_stop (EV_A_ w);
		1203	}
		1204	else if (w->repeat)
		1205	ev_timer_start (EV_A_ w);
		1206	}
489		1207
490	ev_start ((struct ev_watcher *)w, ++atimercnt);	1208	void
491	array_needsize (atimers, atimermax, atimercnt, );	1209	ev_periodic_start (EV_P_ struct ev_periodic *w)
492	atimers [atimercnt - 1] = w;	1210	{
493	upheap (atimers, atimercnt - 1);	1211	if (ev_is_active (w))
		1212	return;
		1213
		1214	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1215
		1216	/* this formula differs from the one in periodic_reify because we do not always round up */
		1217	if (w->interval)
		1218	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1219
		1220	ev_start (EV_A_ (W)w, ++periodiccnt);
		1221	array_needsize (periodics, periodicmax, periodiccnt, );
		1222	periodics [periodiccnt - 1] = w;
		1223	upheap ((WT *)periodics, periodiccnt - 1);
		1224
		1225	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1226	}
		1227
		1228	void
		1229	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1230	{
		1231	ev_clear_pending (EV_A_ (W)w);
		1232	if (!ev_is_active (w))
		1233	return;
		1234
		1235	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1236
		1237	if (((W)w)->active < periodiccnt--)
494	}	1238	{
		1239	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1240	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1241	}
		1242
		1243	ev_stop (EV_A_ (W)w);
		1244	}
		1245
		1246	void
		1247	ev_idle_start (EV_P_ struct ev_idle *w)
		1248	{
		1249	if (ev_is_active (w))
		1250	return;
		1251
		1252	ev_start (EV_A_ (W)w, ++idlecnt);
		1253	array_needsize (idles, idlemax, idlecnt, );
		1254	idles [idlecnt - 1] = w;
		1255	}
		1256
		1257	void
		1258	ev_idle_stop (EV_P_ struct ev_idle *w)
		1259	{
		1260	ev_clear_pending (EV_A_ (W)w);
		1261	if (ev_is_active (w))
		1262	return;
		1263
		1264	idles [((W)w)->active - 1] = idles [--idlecnt];
		1265	ev_stop (EV_A_ (W)w);
		1266	}
		1267
		1268	void
		1269	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1270	{
		1271	if (ev_is_active (w))
		1272	return;
		1273
		1274	ev_start (EV_A_ (W)w, ++preparecnt);
		1275	array_needsize (prepares, preparemax, preparecnt, );
		1276	prepares [preparecnt - 1] = w;
		1277	}
		1278
		1279	void
		1280	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1281	{
		1282	ev_clear_pending (EV_A_ (W)w);
		1283	if (ev_is_active (w))
		1284	return;
		1285
		1286	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1287	ev_stop (EV_A_ (W)w);
		1288	}
		1289
		1290	void
		1291	ev_check_start (EV_P_ struct ev_check *w)
		1292	{
		1293	if (ev_is_active (w))
		1294	return;
		1295
		1296	ev_start (EV_A_ (W)w, ++checkcnt);
		1297	array_needsize (checks, checkmax, checkcnt, );
		1298	checks [checkcnt - 1] = w;
		1299	}
		1300
		1301	void
		1302	ev_check_stop (EV_P_ struct ev_check *w)
		1303	{
		1304	ev_clear_pending (EV_A_ (W)w);
		1305	if (ev_is_active (w))
		1306	return;
		1307
		1308	checks [((W)w)->active - 1] = checks [--checkcnt];
		1309	ev_stop (EV_A_ (W)w);
		1310	}
		1311
		1312	#ifndef SA_RESTART
		1313	# define SA_RESTART 0
		1314	#endif
		1315
		1316	void
		1317	ev_signal_start (EV_P_ struct ev_signal *w)
		1318	{
		1319	#if EV_MULTIPLICITY
		1320	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1321	#endif
		1322	if (ev_is_active (w))
		1323	return;
		1324
		1325	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1326
		1327	ev_start (EV_A_ (W)w, 1);
		1328	array_needsize (signals, signalmax, w->signum, signals_init);
		1329	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1330
		1331	if (!((WL)w)->next)
		1332	{
		1333	#if WIN32
		1334	signal (w->signum, sighandler);
		1335	#else
		1336	struct sigaction sa;
		1337	sa.sa_handler = sighandler;
		1338	sigfillset (&sa.sa_mask);
		1339	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1340	sigaction (w->signum, &sa, 0);
		1341	#endif
		1342	}
		1343	}
		1344
		1345	void
		1346	ev_signal_stop (EV_P_ struct ev_signal *w)
		1347	{
		1348	ev_clear_pending (EV_A_ (W)w);
		1349	if (!ev_is_active (w))
		1350	return;
		1351
		1352	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1353	ev_stop (EV_A_ (W)w);
		1354
		1355	if (!signals [w->signum - 1].head)
		1356	signal (w->signum, SIG_DFL);
		1357	}
		1358
		1359	void
		1360	ev_child_start (EV_P_ struct ev_child *w)
		1361	{
		1362	#if EV_MULTIPLICITY
		1363	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1364	#endif
		1365	if (ev_is_active (w))
		1366	return;
		1367
		1368	ev_start (EV_A_ (W)w, 1);
		1369	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1370	}
		1371
		1372	void
		1373	ev_child_stop (EV_P_ struct ev_child *w)
		1374	{
		1375	ev_clear_pending (EV_A_ (W)w);
		1376	if (ev_is_active (w))
		1377	return;
		1378
		1379	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1380	ev_stop (EV_A_ (W)w);
		1381	}
		1382
		1383	/*****************************************************************************/
		1384
		1385	struct ev_once
		1386	{
		1387	struct ev_io io;
		1388	struct ev_timer to;
		1389	void (*cb)(int revents, void *arg);
		1390	void *arg;
		1391	};
		1392
		1393	static void
		1394	once_cb (EV_P_ struct ev_once *once, int revents)
		1395	{
		1396	void (*cb)(int revents, void *arg) = once->cb;
		1397	void *arg = once->arg;
		1398
		1399	ev_io_stop (EV_A_ &once->io);
		1400	ev_timer_stop (EV_A_ &once->to);
		1401	free (once);
		1402
		1403	cb (revents, arg);
		1404	}
		1405
		1406	static void
		1407	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1408	{
		1409	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1410	}
		1411
		1412	static void
		1413	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1414	{
		1415	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1416	}
		1417
		1418	void
		1419	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1420	{
		1421	struct ev_once *once = malloc (sizeof (struct ev_once));
		1422
		1423	if (!once)
		1424	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
495	else	1425	else
496	{	1426	{
497	w->at += now;	1427	once->cb = cb;
		1428	once->arg = arg;
498		1429
499	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1430	ev_watcher_init (&once->io, once_cb_io);
500	array_needsize (rtimers, rtimermax, rtimercnt, );	1431	if (fd >= 0)
501	rtimers [rtimercnt - 1] = w;
502	upheap (rtimers, rtimercnt - 1);
503	}
504
505	}
506
507	void
508	evtimer_stop (struct ev_timer *w)
509	{
510	if (!ev_is_active (w))
511	return;
512
513	if (w->is_abs)
514	{
515	if (w->active < atimercnt--)
516	{	1432	{
517	atimers [w->active - 1] = atimers [atimercnt];	1433	ev_io_set (&once->io, fd, events);
518	downheap (atimers, atimercnt, w->active - 1);	1434	ev_io_start (EV_A_ &once->io);
519	}	1435	}
520	}	1436
521	else	1437	ev_watcher_init (&once->to, once_cb_to);
522	{	1438	if (timeout >= 0.)
523	if (w->active < rtimercnt--)
524	{	1439	{
525	rtimers [w->active - 1] = rtimers [rtimercnt];	1440	ev_timer_set (&once->to, timeout, 0.);
526	downheap (rtimers, rtimercnt, w->active - 1);	1441	ev_timer_start (EV_A_ &once->to);
527	}	1442	}
528	}	1443	}
529
530	ev_stop ((struct ev_watcher *)w);
531	}	1444	}
532		1445
533	void
534	evsignal_start (struct ev_signal *w)
535	{
536	if (ev_is_active (w))
537	return;
538
539	ev_start ((struct ev_watcher *)w, 1);
540	array_needsize (signals, signalmax, w->signum, signals_init);
541	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
542	}
543
544	void
545	evsignal_stop (struct ev_signal *w)
546	{
547	if (!ev_is_active (w))
548	return;
549
550	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
551	ev_stop ((struct ev_watcher *)w);
552	}
553
554	/*****************************************************************************/
555	#if 1
556
557	static void
558	sin_cb (struct ev_io *w, int revents)
559	{
560	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
561	}
562
563	static void
564	ocb (struct ev_timer *w, int revents)
565	{
566	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
567	evtimer_stop (w);
568	evtimer_start (w);
569	}
570
571	int main (void)
572	{
573	struct ev_io sin;
574
575	ev_init (0);
576
577	evw_init (&sin, sin_cb, 55);
578	evio_set (&sin, 0, EV_READ);
579	evio_start (&sin);
580
581	struct ev_timer t[10000];
582
583	#if 1
584	int i;
585	for (i = 0; i < 10000; ++i)
586	{
587	struct ev_timer *w = t + i;
588	evw_init (w, ocb, i);
589	evtimer_set_abs (w, drand48 (), 0.99775533);
590	evtimer_start (w);
591	if (drand48 () < 0.5)
592	evtimer_stop (w);
593	}
594	#endif
595
596	struct ev_timer t1;
597	evw_init (&t1, ocb, 0);
598	evtimer_set_abs (&t1, 5, 10);
599	evtimer_start (&t1);
600
601	ev_loop (0);
602
603	return 0;
604	}
605
606	#endif
607
608
609
610

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