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Comparing libev/ev.c (file contents):
Revision 1.9 by root, Wed Oct 31 07:24:17 2007 UTC vs.
Revision 1.72 by root, Tue Nov 6 16:09:37 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31	#ifndef EV_STANDALONE
		32	# include "config.h"
		33
		34	# if HAVE_CLOCK_GETTIME
		35	# define EV_USE_MONOTONIC 1
		36	# define EV_USE_REALTIME 1
		37	# endif
		38
		39	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		40	# define EV_USE_SELECT 1
		41	# endif
		42
		43	# if HAVE_POLL && HAVE_POLL_H
		44	# define EV_USE_POLL 1
		45	# endif
		46
		47	# if HAVE_EPOLL && HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		48	# define EV_USE_EPOLL 1
		49	# endif
		50
		51	# if HAVE_KQUEUE && HAVE_WORKING_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		52	# define EV_USE_KQUEUE 1
		53	# endif
		54
		55	#endif
		56
1	#include <math.h>	57	#include <math.h>
2	#include <stdlib.h>	58	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	59	#include <fcntl.h>
5	#include <signal.h>	60	#include <stddef.h>
6		61
7	#include <stdio.h>	62	#include <stdio.h>
8		63
9	#include <assert.h>	64	#include <assert.h>
10	#include <errno.h>	65	#include <errno.h>
11	#include <sys/time.h>	66	#include <sys/types.h>
12	#include <time.h>	67	#include <time.h>
13		68
		69	#include <signal.h>
		70
		71	#ifndef WIN32
		72	# include <unistd.h>
		73	# include <sys/time.h>
		74	# include <sys/wait.h>
		75	#endif
		76	/**/
		77
		78	#ifndef EV_USE_MONOTONIC
		79	# define EV_USE_MONOTONIC 1
		80	#endif
		81
		82	#ifndef EV_USE_SELECT
		83	# define EV_USE_SELECT 1
		84	#endif
		85
		86	#ifndef EV_USE_POLL
		87	# define EV_USE_POLL 0 /* poll is usually slower than select, and not as well tested */
		88	#endif
		89
		90	#ifndef EV_USE_EPOLL
		91	# define EV_USE_EPOLL 0
		92	#endif
		93
		94	#ifndef EV_USE_KQUEUE
		95	# define EV_USE_KQUEUE 0
		96	#endif
		97
		98	#ifndef EV_USE_WIN32
		99	# ifdef WIN32
		100	# define EV_USE_WIN32 0 /* it does not exist, use select */
		101	# undef EV_USE_SELECT
		102	# define EV_USE_SELECT 1
		103	# else
		104	# define EV_USE_WIN32 0
		105	# endif
		106	#endif
		107
		108	#ifndef EV_USE_REALTIME
		109	# define EV_USE_REALTIME 1
		110	#endif
		111
		112	/**/
		113
14	#ifdef CLOCK_MONOTONIC	114	#ifndef CLOCK_MONOTONIC
		115	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	116	# define EV_USE_MONOTONIC 0
16	#endif	117	#endif
17		118
		119	#ifndef CLOCK_REALTIME
		120	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	121	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	122	#endif
20	#define HAVE_SELECT 1	123
		124	/**/
21		125
22	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	126	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	#define MAX_BLOCKTIME 60.	127	#define MAX_BLOCKTIME 59.731 /* never wait longer than this time (to detect time jumps) */
		128	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		129	/*#define CLEANUP_INTERVAL 300. /* how often to try to free memory and re-check fds */
24		130
25	#include "ev.h"	131	#include "ev.h"
26		132
		133	#if __GNUC__ >= 3
		134	# define expect(expr,value) __builtin_expect ((expr),(value))
		135	# define inline inline
		136	#else
		137	# define expect(expr,value) (expr)
		138	# define inline static
		139	#endif
		140
		141	#define expect_false(expr) expect ((expr) != 0, 0)
		142	#define expect_true(expr) expect ((expr) != 0, 1)
		143
		144	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		145	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		146
27	struct ev_watcher {	147	typedef struct ev_watcher *W;
28	EV_WATCHER (ev_watcher);	148	typedef struct ev_watcher_list *WL;
		149	typedef struct ev_watcher_time *WT;
		150
		151	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		152
		153	#if WIN32
		154	/* note: the comment below could not be substantiated, but what would I care */
		155	/* MSDN says this is required to handle SIGFPE */
		156	volatile double SIGFPE_REQ = 0.0f;
		157
		158	static int
		159	ev_socketpair_tcp (int filedes [2])
		160	{
		161	struct sockaddr_in addr = { 0 };
		162	int addr_size = sizeof (addr);
		163	SOCKET listener;
		164	SOCKET sock [2] = { -1, -1 };
		165
		166	if ((listener = socket (AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
		167	return -1;
		168
		169	addr.sin_family = AF_INET;
		170	addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
		171	addr.sin_port = 0;
		172
		173	if (bind (listener, (struct sockaddr *)&addr, addr_size))
		174	goto fail;
		175
		176	if (getsockname(listener, (struct sockaddr *)&addr, &addr_size))
		177	goto fail;
		178
		179	if (listen (listener, 1))
		180	goto fail;
		181
		182	if ((sock [0] = socket (AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
		183	goto fail;
		184
		185	if (connect (sock[0], (struct sockaddr *)&addr, addr_size))
		186	goto fail;
		187
		188	if ((sock[1] = accept (listener, 0, 0)) < 0)
		189	goto fail;
		190
		191	closesocket (listener);
		192
		193	filedes [0] = sock [0];
		194	filedes [1] = sock [1];
		195
		196	return 0;
		197
		198	fail:
		199	closesocket (listener);
		200
		201	if (sock [0] != INVALID_SOCKET) closesocket (sock [0]);
		202	if (sock [1] != INVALID_SOCKET) closesocket (sock [1]);
		203
		204	return -1;
		205	}
		206
		207	# define ev_pipe(filedes) ev_socketpair_tcp (filedes)
		208	#else
		209	# define ev_pipe(filedes) pipe (filedes)
		210	#endif
		211
		212	/*****************************************************************************/
		213
		214	static void (*syserr_cb)(const char *msg);
		215
		216	void ev_set_syserr_cb (void (*cb)(const char *msg))
		217	{
		218	syserr_cb = cb;
		219	}
		220
		221	static void
		222	syserr (const char *msg)
		223	{
		224	if (!msg)
		225	msg = "(libev) system error";
		226
		227	if (syserr_cb)
		228	syserr_cb (msg);
		229	else
		230	{
		231	perror (msg);
		232	abort ();
		233	}
		234	}
		235
		236	static void *(*alloc)(void *ptr, long size);
		237
		238	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		239	{
		240	alloc = cb;
		241	}
		242
		243	static void *
		244	ev_realloc (void *ptr, long size)
		245	{
		246	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		247
		248	if (!ptr && size)
		249	{
		250	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		251	abort ();
		252	}
		253
		254	return ptr;
		255	}
		256
		257	#define ev_malloc(size) ev_realloc (0, (size))
		258	#define ev_free(ptr) ev_realloc ((ptr), 0)
		259
		260	/*****************************************************************************/
		261
		262	typedef struct
		263	{
		264	WL head;
		265	unsigned char events;
		266	unsigned char reify;
		267	} ANFD;
		268
		269	typedef struct
		270	{
		271	W w;
		272	int events;
		273	} ANPENDING;
		274
		275	#if EV_MULTIPLICITY
		276
		277	struct ev_loop
		278	{
		279	# define VAR(name,decl) decl;
		280	# include "ev_vars.h"
29	};	281	};
		282	# undef VAR
		283	# include "ev_wrap.h"
30		284
31	struct ev_watcher_list {	285	#else
32	EV_WATCHER_LIST (ev_watcher_list);
33	};
34		286
35	static ev_tstamp now, diff; /* monotonic clock */	287	# define VAR(name,decl) static decl;
36	ev_tstamp ev_now;	288	# include "ev_vars.h"
37	int ev_method;	289	# undef VAR
38		290
39	static int have_monotonic; /* runtime */	291	#endif
40
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */
42	static void (*method_modify)(int fd, int oev, int nev);
43	static void (*method_poll)(ev_tstamp timeout);
44		292
45	/*****************************************************************************/	293	/*****************************************************************************/
46		294
47	ev_tstamp	295	inline ev_tstamp
48	ev_time (void)	296	ev_time (void)
49	{	297	{
50	#if HAVE_REALTIME	298	#if EV_USE_REALTIME
51	struct timespec ts;	299	struct timespec ts;
52	clock_gettime (CLOCK_REALTIME, &ts);	300	clock_gettime (CLOCK_REALTIME, &ts);
53	return ts.tv_sec + ts.tv_nsec * 1e-9;	301	return ts.tv_sec + ts.tv_nsec * 1e-9;
54	#else	302	#else
55	struct timeval tv;	303	struct timeval tv;
56	gettimeofday (&tv, 0);	304	gettimeofday (&tv, 0);
57	return tv.tv_sec + tv.tv_usec * 1e-6;	305	return tv.tv_sec + tv.tv_usec * 1e-6;
58	#endif	306	#endif
59	}	307	}
60		308
61	static ev_tstamp	309	inline ev_tstamp
62	get_clock (void)	310	get_clock (void)
63	{	311	{
64	#if HAVE_MONOTONIC	312	#if EV_USE_MONOTONIC
65	if (have_monotonic)	313	if (expect_true (have_monotonic))
66	{	314	{
67	struct timespec ts;	315	struct timespec ts;
68	clock_gettime (CLOCK_MONOTONIC, &ts);	316	clock_gettime (CLOCK_MONOTONIC, &ts);
69	return ts.tv_sec + ts.tv_nsec * 1e-9;	317	return ts.tv_sec + ts.tv_nsec * 1e-9;
70	}	318	}
71	#endif	319	#endif
72		320
73	return ev_time ();	321	return ev_time ();
74	}	322	}
75		323
		324	ev_tstamp
		325	ev_now (EV_P)
		326	{
		327	return rt_now;
		328	}
		329
		330	#define array_roundsize(base,n) ((n) | 4 & ~3)
		331
76	#define array_needsize(base,cur,cnt,init) \	332	#define array_needsize(base,cur,cnt,init) \
77	if ((cnt) > cur) \	333	if (expect_false ((cnt) > cur)) \
78	{ \	334	{ \
79	int newcnt = cur ? cur << 1 : 16; \	335	int newcnt = cur; \
80	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	336	do \
		337	{ \
		338	newcnt = array_roundsize (base, newcnt << 1); \
		339	} \
		340	while ((cnt) > newcnt); \
		341	\
81	base = realloc (base, sizeof (*base) * (newcnt)); \	342	base = ev_realloc (base, sizeof (*base) * (newcnt)); \
82	init (base + cur, newcnt - cur); \	343	init (base + cur, newcnt - cur); \
83	cur = newcnt; \	344	cur = newcnt; \
84	}	345	}
		346
		347	#define array_slim(stem) \
		348	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		349	{ \
		350	stem ## max = array_roundsize (stem ## cnt >> 1); \
		351	base = ev_realloc (base, sizeof (*base) * (stem ## max)); \
		352	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		353	}
		354
		355	/* microsoft's pseudo-c is quite far from C as the rest of the world and the standard knows it */
		356	/* bringing us everlasting joy in form of stupid extra macros that are not required in C */
		357	#define array_free_microshit(stem) \
		358	ev_free (stem ## s); stem ## cnt = stem ## max = 0;
		359
		360	#define array_free(stem, idx) \
		361	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
85		362
86	/*****************************************************************************/	363	/*****************************************************************************/
87		364
88	typedef struct
89	{
90	struct ev_io *head;
91	unsigned char wev, rev; /* want, received event set */
92	} ANFD;
93
94	static ANFD *anfds;
95	static int anfdmax;
96
97	static int *fdchanges;
98	static int fdchangemax, fdchangecnt;
99
100	static void	365	static void
101	anfds_init (ANFD *base, int count)	366	anfds_init (ANFD *base, int count)
102	{	367	{
103	while (count--)	368	while (count--)
104	{	369	{
105	base->head = 0;	370	base->head = 0;
106	base->wev = base->rev = EV_NONE;	371	base->events = EV_NONE;
		372	base->reify = 0;
		373
107	++base;	374	++base;
108	}	375	}
109	}	376	}
110		377
111	typedef struct
112	{
113	struct ev_watcher *w;
114	int events;
115	} ANPENDING;
116
117	static ANPENDING *pendings;
118	static int pendingmax, pendingcnt;
119
120	static void	378	static void
121	event (struct ev_watcher *w, int events)	379	event (EV_P_ W w, int events)
122	{	380	{
		381	if (w->pending)
		382	{
		383	pendings [ABSPRI (w)][w->pending - 1].events |= events;
		384	return;
		385	}
		386
123	w->pending = ++pendingcnt;	387	w->pending = ++pendingcnt [ABSPRI (w)];
124	array_needsize (pendings, pendingmax, pendingcnt, );	388	array_needsize (pendings [ABSPRI (w)], pendingmax [ABSPRI (w)], pendingcnt [ABSPRI (w)], (void));
125	pendings [pendingcnt - 1].w = w;	389	pendings [ABSPRI (w)][w->pending - 1].w = w;
126	pendings [pendingcnt - 1].events = events;	390	pendings [ABSPRI (w)][w->pending - 1].events = events;
127	}	391	}
128		392
129	static void	393	static void
		394	queue_events (EV_P_ W *events, int eventcnt, int type)
		395	{
		396	int i;
		397
		398	for (i = 0; i < eventcnt; ++i)
		399	event (EV_A_ events [i], type);
		400	}
		401
		402	static void
130	fd_event (int fd, int events)	403	fd_event (EV_P_ int fd, int events)
131	{	404	{
132	ANFD *anfd = anfds + fd;	405	ANFD *anfd = anfds + fd;
133	struct ev_io *w;	406	struct ev_io *w;
134		407
135	for (w = anfd->head; w; w = w->next)	408	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
136	{	409	{
137	int ev = w->events & events;	410	int ev = w->events & events;
138		411
139	if (ev)	412	if (ev)
140	event ((struct ev_watcher *)w, ev);	413	event (EV_A_ (W)w, ev);
141	}	414	}
142	}	415	}
143		416
		417	/*****************************************************************************/
		418
144	static void	419	static void
145	queue_events (struct ev_watcher **events, int eventcnt, int type)	420	fd_reify (EV_P)
146	{	421	{
147	int i;	422	int i;
148		423
149	for (i = 0; i < eventcnt; ++i)	424	for (i = 0; i < fdchangecnt; ++i)
150	event (events [i], type);	425	{
		426	int fd = fdchanges [i];
		427	ANFD *anfd = anfds + fd;
		428	struct ev_io *w;
		429
		430	int events = 0;
		431
		432	for (w = (struct ev_io *)anfd->head; w; w = (struct ev_io *)((WL)w)->next)
		433	events |= w->events;
		434
		435	anfd->reify = 0;
		436
		437	method_modify (EV_A_ fd, anfd->events, events);
		438	anfd->events = events;
		439	}
		440
		441	fdchangecnt = 0;
		442	}
		443
		444	static void
		445	fd_change (EV_P_ int fd)
		446	{
		447	if (anfds [fd].reify)
		448	return;
		449
		450	anfds [fd].reify = 1;
		451
		452	++fdchangecnt;
		453	array_needsize (fdchanges, fdchangemax, fdchangecnt, (void));
		454	fdchanges [fdchangecnt - 1] = fd;
		455	}
		456
		457	static void
		458	fd_kill (EV_P_ int fd)
		459	{
		460	struct ev_io *w;
		461
		462	while ((w = (struct ev_io *)anfds [fd].head))
		463	{
		464	ev_io_stop (EV_A_ w);
		465	event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		466	}
		467	}
		468
		469	static int
		470	fd_valid (int fd)
		471	{
		472	#ifdef WIN32
		473	return !!win32_get_osfhandle (fd);
		474	#else
		475	return fcntl (fd, F_GETFD) != -1;
		476	#endif
		477	}
		478
		479	/* called on EBADF to verify fds */
		480	static void
		481	fd_ebadf (EV_P)
		482	{
		483	int fd;
		484
		485	for (fd = 0; fd < anfdmax; ++fd)
		486	if (anfds [fd].events)
		487	if (!fd_valid (fd) == -1 && errno == EBADF)
		488	fd_kill (EV_A_ fd);
		489	}
		490
		491	/* called on ENOMEM in select/poll to kill some fds and retry */
		492	static void
		493	fd_enomem (EV_P)
		494	{
		495	int fd;
		496
		497	for (fd = anfdmax; fd--; )
		498	if (anfds [fd].events)
		499	{
		500	fd_kill (EV_A_ fd);
		501	return;
		502	}
		503	}
		504
		505	/* usually called after fork if method needs to re-arm all fds from scratch */
		506	static void
		507	fd_rearm_all (EV_P)
		508	{
		509	int fd;
		510
		511	/* this should be highly optimised to not do anything but set a flag */
		512	for (fd = 0; fd < anfdmax; ++fd)
		513	if (anfds [fd].events)
		514	{
		515	anfds [fd].events = 0;
		516	fd_change (EV_A_ fd);
		517	}
151	}	518	}
152		519
153	/*****************************************************************************/	520	/*****************************************************************************/
154		521
155	static struct ev_timer **atimers;
156	static int atimermax, atimercnt;
157
158	static struct ev_timer **rtimers;
159	static int rtimermax, rtimercnt;
160
161	static void	522	static void
162	upheap (struct ev_timer **timers, int k)	523	upheap (WT *heap, int k)
163	{	524	{
164	struct ev_timer *w = timers [k];	525	WT w = heap [k];
165		526
166	while (k && timers [k >> 1]->at > w->at)	527	while (k && heap [k >> 1]->at > w->at)
167	{	528	{
168	timers [k] = timers [k >> 1];	529	heap [k] = heap [k >> 1];
169	timers [k]->active = k + 1;	530	((W)heap [k])->active = k + 1;
170	k >>= 1;	531	k >>= 1;
171	}	532	}
172		533
173	timers [k] = w;	534	heap [k] = w;
174	timers [k]->active = k + 1;	535	((W)heap [k])->active = k + 1;
175		536
176	}	537	}
177		538
178	static void	539	static void
179	downheap (struct ev_timer **timers, int N, int k)	540	downheap (WT *heap, int N, int k)
180	{	541	{
181	struct ev_timer *w = timers [k];	542	WT w = heap [k];
182		543
183	while (k < (N >> 1))	544	while (k < (N >> 1))
184	{	545	{
185	int j = k << 1;	546	int j = k << 1;
186		547
187	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)	548	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
188	++j;	549	++j;
189		550
190	if (w->at <= timers [j]->at)	551	if (w->at <= heap [j]->at)
191	break;	552	break;
192		553
193	timers [k] = timers [j];	554	heap [k] = heap [j];
194	timers [k]->active = k + 1;	555	((W)heap [k])->active = k + 1;
195	k = j;	556	k = j;
196	}	557	}
197		558
198	timers [k] = w;	559	heap [k] = w;
199	timers [k]->active = k + 1;	560	((W)heap [k])->active = k + 1;
200	}	561	}
201		562
202	/*****************************************************************************/	563	/*****************************************************************************/
203		564
204	typedef struct	565	typedef struct
205	{	566	{
206	struct ev_signal *head;	567	WL head;
207	sig_atomic_t gotsig;	568	sig_atomic_t volatile gotsig;
208	} ANSIG;	569	} ANSIG;
209		570
210	static ANSIG *signals;	571	static ANSIG *signals;
211	static int signalmax;	572	static int signalmax;
212		573
213	static int sigpipe [2];	574	static int sigpipe [2];
214	static sig_atomic_t gotsig;	575	static sig_atomic_t volatile gotsig;
215	static struct ev_io sigev;	576	static struct ev_io sigev;
216		577
217	static void	578	static void
218	signals_init (ANSIG *base, int count)	579	signals_init (ANSIG *base, int count)
219	{	580	{
220	while (count--)	581	while (count--)
221	{	582	{
222	base->head = 0;	583	base->head = 0;
223	base->gotsig = 0;	584	base->gotsig = 0;
		585
224	++base;	586	++base;
225	}	587	}
226	}	588	}
227		589
228	static void	590	static void
229	sighandler (int signum)	591	sighandler (int signum)
230	{	592	{
		593	#if WIN32
		594	signal (signum, sighandler);
		595	#endif
		596
231	signals [signum - 1].gotsig = 1;	597	signals [signum - 1].gotsig = 1;
232		598
233	if (!gotsig)	599	if (!gotsig)
234	{	600	{
		601	int old_errno = errno;
235	gotsig = 1;	602	gotsig = 1;
236	write (sigpipe [1], &gotsig, 1);	603	write (sigpipe [1], &signum, 1);
		604	errno = old_errno;
237	}	605	}
238	}	606	}
239		607
240	static void	608	static void
241	sigcb (struct ev_io *iow, int revents)	609	sigcb (EV_P_ struct ev_io *iow, int revents)
242	{	610	{
243	struct ev_signal *w;	611	WL w;
244	int sig;	612	int signum;
245		613
		614	read (sigpipe [0], &revents, 1);
246	gotsig = 0;	615	gotsig = 0;
247	read (sigpipe [0], &revents, 1);
248		616
249	for (sig = signalmax; sig--; )	617	for (signum = signalmax; signum--; )
250	if (signals [sig].gotsig)	618	if (signals [signum].gotsig)
251	{	619	{
252	signals [sig].gotsig = 0;	620	signals [signum].gotsig = 0;
253		621
254	for (w = signals [sig].head; w; w = w->next)	622	for (w = signals [signum].head; w; w = w->next)
255	event ((struct ev_watcher *)w, EV_SIGNAL);	623	event (EV_A_ (W)w, EV_SIGNAL);
256	}	624	}
257	}	625	}
258		626
259	static void	627	static void
260	siginit (void)	628	siginit (EV_P)
261	{	629	{
		630	#ifndef WIN32
262	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	631	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);
263	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);	632	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
264		633
265	/* rather than sort out wether we really need nb, set it */	634	/* rather than sort out wether we really need nb, set it */
266	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	635	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);
267	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	636	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);
		637	#endif
268		638
269	evio_set (&sigev, sigpipe [0], EV_READ);	639	ev_io_set (&sigev, sigpipe [0], EV_READ);
270	evio_start (&sigev);	640	ev_io_start (EV_A_ &sigev);
		641	ev_unref (EV_A); /* child watcher should not keep loop alive */
271	}	642	}
272		643
273	/*****************************************************************************/	644	/*****************************************************************************/
274		645
275	static struct ev_idle **idles;	646	static struct ev_child *childs [PID_HASHSIZE];
276	static int idlemax, idlecnt;
277		647
278	static struct ev_check **checks;	648	#ifndef WIN32
279	static int checkmax, checkcnt;	649
		650	static struct ev_signal childev;
		651
		652	#ifndef WCONTINUED
		653	# define WCONTINUED 0
		654	#endif
		655
		656	static void
		657	child_reap (EV_P_ struct ev_signal *sw, int chain, int pid, int status)
		658	{
		659	struct ev_child *w;
		660
		661	for (w = (struct ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (struct ev_child *)((WL)w)->next)
		662	if (w->pid == pid || !w->pid)
		663	{
		664	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
		665	w->rpid = pid;
		666	w->rstatus = status;
		667	event (EV_A_ (W)w, EV_CHILD);
		668	}
		669	}
		670
		671	static void
		672	childcb (EV_P_ struct ev_signal *sw, int revents)
		673	{
		674	int pid, status;
		675
		676	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
		677	{
		678	/* make sure we are called again until all childs have been reaped */
		679	event (EV_A_ (W)sw, EV_SIGNAL);
		680
		681	child_reap (EV_A_ sw, pid, pid, status);
		682	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but event catches that */
		683	}
		684	}
		685
		686	#endif
280		687
281	/*****************************************************************************/	688	/*****************************************************************************/
282		689
		690	#if EV_USE_KQUEUE
		691	# include "ev_kqueue.c"
		692	#endif
283	#if HAVE_EPOLL	693	#if EV_USE_EPOLL
284	# include "ev_epoll.c"	694	# include "ev_epoll.c"
285	#endif	695	#endif
		696	#if EV_USE_POLL
		697	# include "ev_poll.c"
		698	#endif
286	#if HAVE_SELECT	699	#if EV_USE_SELECT
287	# include "ev_select.c"	700	# include "ev_select.c"
288	#endif	701	#endif
289		702
290	int ev_init (int flags)	703	int
		704	ev_version_major (void)
291	{	705	{
		706	return EV_VERSION_MAJOR;
		707	}
		708
		709	int
		710	ev_version_minor (void)
		711	{
		712	return EV_VERSION_MINOR;
		713	}
		714
		715	/* return true if we are running with elevated privileges and should ignore env variables */
		716	static int
		717	enable_secure (void)
		718	{
		719	#ifdef WIN32
		720	return 0;
		721	#else
		722	return getuid () != geteuid ()
		723	|| getgid () != getegid ();
		724	#endif
		725	}
		726
		727	int
		728	ev_method (EV_P)
		729	{
		730	return method;
		731	}
		732
		733	static void
		734	loop_init (EV_P_ int methods)
		735	{
		736	if (!method)
		737	{
292	#if HAVE_MONOTONIC	738	#if EV_USE_MONOTONIC
293	{	739	{
294	struct timespec ts;	740	struct timespec ts;
295	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	741	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
296	have_monotonic = 1;	742	have_monotonic = 1;
297	}	743	}
298	#endif	744	#endif
299		745
300	ev_now = ev_time ();	746	rt_now = ev_time ();
301	now = get_clock ();	747	mn_now = get_clock ();
302	diff = ev_now - now;	748	now_floor = mn_now;
		749	rtmn_diff = rt_now - mn_now;
303		750
		751	if (methods == EVMETHOD_AUTO)
		752	if (!enable_secure () && getenv ("LIBEV_METHODS"))
		753	methods = atoi (getenv ("LIBEV_METHODS"));
		754	else
		755	methods = EVMETHOD_ANY;
		756
		757	method = 0;
		758	#if EV_USE_WIN32
		759	if (!method && (methods & EVMETHOD_WIN32 )) method = win32_init (EV_A_ methods);
		760	#endif
		761	#if EV_USE_KQUEUE
		762	if (!method && (methods & EVMETHOD_KQUEUE)) method = kqueue_init (EV_A_ methods);
		763	#endif
		764	#if EV_USE_EPOLL
		765	if (!method && (methods & EVMETHOD_EPOLL )) method = epoll_init (EV_A_ methods);
		766	#endif
		767	#if EV_USE_POLL
		768	if (!method && (methods & EVMETHOD_POLL )) method = poll_init (EV_A_ methods);
		769	#endif
		770	#if EV_USE_SELECT
		771	if (!method && (methods & EVMETHOD_SELECT)) method = select_init (EV_A_ methods);
		772	#endif
		773
		774	ev_watcher_init (&sigev, sigcb);
		775	ev_set_priority (&sigev, EV_MAXPRI);
		776	}
		777	}
		778
		779	void
		780	loop_destroy (EV_P)
		781	{
		782	int i;
		783
		784	#if EV_USE_WIN32
		785	if (method == EVMETHOD_WIN32 ) win32_destroy (EV_A);
		786	#endif
		787	#if EV_USE_KQUEUE
		788	if (method == EVMETHOD_KQUEUE) kqueue_destroy (EV_A);
		789	#endif
		790	#if EV_USE_EPOLL
		791	if (method == EVMETHOD_EPOLL ) epoll_destroy (EV_A);
		792	#endif
		793	#if EV_USE_POLL
		794	if (method == EVMETHOD_POLL ) poll_destroy (EV_A);
		795	#endif
		796	#if EV_USE_SELECT
		797	if (method == EVMETHOD_SELECT) select_destroy (EV_A);
		798	#endif
		799
		800	for (i = NUMPRI; i--; )
		801	array_free (pending, [i]);
		802
		803	/* have to use the microsoft-never-gets-it-right macro */
		804	array_free_microshit (fdchange);
		805	array_free_microshit (timer);
		806	array_free_microshit (periodic);
		807	array_free_microshit (idle);
		808	array_free_microshit (prepare);
		809	array_free_microshit (check);
		810
		811	method = 0;
		812	}
		813
		814	static void
		815	loop_fork (EV_P)
		816	{
		817	#if EV_USE_EPOLL
		818	if (method == EVMETHOD_EPOLL ) epoll_fork (EV_A);
		819	#endif
		820	#if EV_USE_KQUEUE
		821	if (method == EVMETHOD_KQUEUE) kqueue_fork (EV_A);
		822	#endif
		823
		824	if (ev_is_active (&sigev))
		825	{
		826	/* default loop */
		827
		828	ev_ref (EV_A);
		829	ev_io_stop (EV_A_ &sigev);
		830	close (sigpipe [0]);
		831	close (sigpipe [1]);
		832
		833	while (ev_pipe (sigpipe))
		834	syserr ("(libev) error creating pipe");
		835
		836	siginit (EV_A);
		837	}
		838
		839	postfork = 0;
		840	}
		841
		842	#if EV_MULTIPLICITY
		843	struct ev_loop *
		844	ev_loop_new (int methods)
		845	{
		846	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		847
		848	memset (loop, 0, sizeof (struct ev_loop));
		849
		850	loop_init (EV_A_ methods);
		851
		852	if (ev_method (EV_A))
		853	return loop;
		854
		855	return 0;
		856	}
		857
		858	void
		859	ev_loop_destroy (EV_P)
		860	{
		861	loop_destroy (EV_A);
		862	ev_free (loop);
		863	}
		864
		865	void
		866	ev_loop_fork (EV_P)
		867	{
		868	postfork = 1;
		869	}
		870
		871	#endif
		872
		873	#if EV_MULTIPLICITY
		874	struct ev_loop default_loop_struct;
		875	static struct ev_loop *default_loop;
		876
		877	struct ev_loop *
		878	#else
		879	static int default_loop;
		880
		881	int
		882	#endif
		883	ev_default_loop (int methods)
		884	{
		885	if (sigpipe [0] == sigpipe [1])
304	if (pipe (sigpipe))	886	if (ev_pipe (sigpipe))
305	return 0;	887	return 0;
306		888
307	ev_method = EVMETHOD_NONE;	889	if (!default_loop)
308	#if HAVE_EPOLL	890	{
309	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	891	#if EV_MULTIPLICITY
		892	struct ev_loop *loop = default_loop = &default_loop_struct;
		893	#else
		894	default_loop = 1;
310	#endif	895	#endif
311	#if HAVE_SELECT
312	if (ev_method == EVMETHOD_NONE) select_init (flags);
313	#endif
314		896
		897	loop_init (EV_A_ methods);
		898
		899	if (ev_method (EV_A))
		900	{
		901	siginit (EV_A);
		902
		903	#ifndef WIN32
		904	ev_signal_init (&childev, childcb, SIGCHLD);
		905	ev_set_priority (&childev, EV_MAXPRI);
		906	ev_signal_start (EV_A_ &childev);
		907	ev_unref (EV_A); /* child watcher should not keep loop alive */
		908	#endif
		909	}
		910	else
		911	default_loop = 0;
		912	}
		913
		914	return default_loop;
		915	}
		916
		917	void
		918	ev_default_destroy (void)
		919	{
		920	#if EV_MULTIPLICITY
		921	struct ev_loop *loop = default_loop;
		922	#endif
		923
		924	#ifndef WIN32
		925	ev_ref (EV_A); /* child watcher */
		926	ev_signal_stop (EV_A_ &childev);
		927	#endif
		928
		929	ev_ref (EV_A); /* signal watcher */
		930	ev_io_stop (EV_A_ &sigev);
		931
		932	close (sigpipe [0]); sigpipe [0] = 0;
		933	close (sigpipe [1]); sigpipe [1] = 0;
		934
		935	loop_destroy (EV_A);
		936	}
		937
		938	void
		939	ev_default_fork (void)
		940	{
		941	#if EV_MULTIPLICITY
		942	struct ev_loop *loop = default_loop;
		943	#endif
		944
315	if (ev_method)	945	if (method)
316	{	946	postfork = 1;
317	evw_init (&sigev, sigcb, 0);
318	siginit ();
319	}
320
321	return ev_method;
322	}	947	}
323		948
324	/*****************************************************************************/	949	/*****************************************************************************/
325		950
326	void ev_prefork (void)
327	{
328	}
329
330	void ev_postfork_parent (void)
331	{
332	}
333
334	void ev_postfork_child (void)
335	{
336	#if HAVE_EPOLL
337	if (ev_method == EVMETHOD_EPOLL)
338	epoll_postfork_child ();
339	#endif
340
341	evio_stop (&sigev);
342	close (sigpipe [0]);
343	close (sigpipe [1]);
344	pipe (sigpipe);
345	siginit ();
346	}
347
348	/*****************************************************************************/
349
350	static void	951	static void
351	fd_reify (void)	952	call_pending (EV_P)
352	{	953	{
353	int i;	954	int pri;
354		955
355	for (i = 0; i < fdchangecnt; ++i)	956	for (pri = NUMPRI; pri--; )
356	{	957	while (pendingcnt [pri])
357	int fd = fdchanges [i];
358	ANFD *anfd = anfds + fd;
359	struct ev_io *w;
360
361	int wev = 0;
362
363	for (w = anfd->head; w; w = w->next)
364	wev |= w->events;
365
366	if (anfd->wev != wev)
367	{	958	{
368	method_modify (fd, anfd->wev, wev);	959	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
369	anfd->wev = wev;
370	}
371	}
372		960
373	fdchangecnt = 0;
374	}
375
376	static void
377	call_pending ()
378	{
379	int i;
380
381	for (i = 0; i < pendingcnt; ++i)
382	{
383	ANPENDING *p = pendings + i;
384
385	if (p->w)	961	if (p->w)
386	{	962	{
387	p->w->pending = 0;	963	p->w->pending = 0;
388	p->w->cb (p->w, p->events);	964	p->w->cb (EV_A_ p->w, p->events);
389	}	965	}
390	}	966	}
391
392	pendingcnt = 0;
393	}	967	}
394		968
395	static void	969	static void
396	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	970	timers_reify (EV_P)
397	{	971	{
398	while (timercnt && timers [0]->at <= now)	972	while (timercnt && ((WT)timers [0])->at <= mn_now)
399	{	973	{
400	struct ev_timer *w = timers [0];	974	struct ev_timer *w = timers [0];
		975
		976	assert (("inactive timer on timer heap detected", ev_is_active (w)));
401		977
402	/* first reschedule or stop timer */	978	/* first reschedule or stop timer */
403	if (w->repeat)	979	if (w->repeat)
404	{	980	{
405	if (w->is_abs)	981	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
406	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;
407	else
408	w->at = now + w->repeat;	982	((WT)w)->at = mn_now + w->repeat;
409
410	assert (w->at > now);
411
412	downheap (timers, timercnt, 0);	983	downheap ((WT *)timers, timercnt, 0);
413	}	984	}
414	else	985	else
		986	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		987
		988	event (EV_A_ (W)w, EV_TIMEOUT);
		989	}
		990	}
		991
		992	static void
		993	periodics_reify (EV_P)
		994	{
		995	while (periodiccnt && ((WT)periodics [0])->at <= rt_now)
		996	{
		997	struct ev_periodic *w = periodics [0];
		998
		999	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1000
		1001	/* first reschedule or stop timer */
		1002	if (w->interval)
415	{	1003	{
416	evtimer_stop (w); /* nonrepeating: stop timer */	1004	((WT)w)->at += floor ((rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
417	--timercnt; /* maybe pass by reference instead? */	1005	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > rt_now));
		1006	downheap ((WT *)periodics, periodiccnt, 0);
418	}	1007	}
		1008	else
		1009	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
419		1010
420	event ((struct ev_watcher *)w, EV_TIMEOUT);	1011	event (EV_A_ (W)w, EV_PERIODIC);
421	}	1012	}
422	}	1013	}
423		1014
424	static void	1015	static void
425	time_update ()	1016	periodics_reschedule (EV_P)
426	{	1017	{
427	int i;	1018	int i;
428	ev_now = ev_time ();
429		1019
430	if (have_monotonic)	1020	/* adjust periodics after time jump */
		1021	for (i = 0; i < periodiccnt; ++i)
431	{	1022	{
432	ev_tstamp odiff = diff;	1023	struct ev_periodic *w = periodics [i];
433		1024
434	/* detecting time jumps is much more difficult */	1025	if (w->interval)
435	for (i = 2; --i; ) /* loop a few times, before making important decisions */
436	{	1026	{
437	now = get_clock ();	1027	ev_tstamp diff = ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
438	diff = ev_now - now;
439		1028
440	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1029	if (fabs (diff) >= 1e-4)
441	return; /* all is well */	1030	{
		1031	ev_periodic_stop (EV_A_ w);
		1032	ev_periodic_start (EV_A_ w);
442		1033
443	ev_now = ev_time ();	1034	i = 0; /* restart loop, inefficient, but time jumps should be rare */
		1035	}
444	}	1036	}
		1037	}
		1038	}
445		1039
446	/* time jump detected, reschedule atimers */	1040	inline int
447	for (i = 0; i < atimercnt; ++i)	1041	time_update_monotonic (EV_P)
		1042	{
		1043	mn_now = get_clock ();
		1044
		1045	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1046	{
		1047	rt_now = rtmn_diff + mn_now;
		1048	return 0;
		1049	}
		1050	else
		1051	{
		1052	now_floor = mn_now;
		1053	rt_now = ev_time ();
		1054	return 1;
		1055	}
		1056	}
		1057
		1058	static void
		1059	time_update (EV_P)
		1060	{
		1061	int i;
		1062
		1063	#if EV_USE_MONOTONIC
		1064	if (expect_true (have_monotonic))
		1065	{
		1066	if (time_update_monotonic (EV_A))
448	{	1067	{
449	struct ev_timer *w = atimers [i];	1068	ev_tstamp odiff = rtmn_diff;
450	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1069
		1070	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1071	{
		1072	rtmn_diff = rt_now - mn_now;
		1073
		1074	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1075	return; /* all is well */
		1076
		1077	rt_now = ev_time ();
		1078	mn_now = get_clock ();
		1079	now_floor = mn_now;
		1080	}
		1081
		1082	periodics_reschedule (EV_A);
		1083	/* no timer adjustment, as the monotonic clock doesn't jump */
		1084	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
451	}	1085	}
452	}	1086	}
453	else	1087	else
		1088	#endif
454	{	1089	{
455	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)	1090	rt_now = ev_time ();
456	/* time jump detected, adjust rtimers */	1091
		1092	if (expect_false (mn_now > rt_now || mn_now < rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1093	{
		1094	periodics_reschedule (EV_A);
		1095
		1096	/* adjust timers. this is easy, as the offset is the same for all */
457	for (i = 0; i < rtimercnt; ++i)	1097	for (i = 0; i < timercnt; ++i)
458	rtimers [i]->at += ev_now - now;	1098	((WT)timers [i])->at += rt_now - mn_now;
		1099	}
459		1100
460	now = ev_now;	1101	mn_now = rt_now;
461	}	1102	}
462	}	1103	}
463		1104
464	int ev_loop_done;	1105	void
		1106	ev_ref (EV_P)
		1107	{
		1108	++activecnt;
		1109	}
465		1110
		1111	void
		1112	ev_unref (EV_P)
		1113	{
		1114	--activecnt;
		1115	}
		1116
		1117	static int loop_done;
		1118
		1119	void
466	void ev_loop (int flags)	1120	ev_loop (EV_P_ int flags)
467	{	1121	{
468	double block;	1122	double block;
469	ev_loop_done = flags & EVLOOP_ONESHOT;	1123	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK) ? 1 : 0;
470
471	if (checkcnt)
472	{
473	queue_events (checks, checkcnt, EV_CHECK);
474	call_pending ();
475	}
476		1124
477	do	1125	do
478	{	1126	{
		1127	/* queue check watchers (and execute them) */
		1128	if (expect_false (preparecnt))
		1129	{
		1130	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1131	call_pending (EV_A);
		1132	}
		1133
		1134	/* we might have forked, so reify kernel state if necessary */
		1135	if (expect_false (postfork))
		1136	loop_fork (EV_A);
		1137
479	/* update fd-related kernel structures */	1138	/* update fd-related kernel structures */
480	fd_reify ();	1139	fd_reify (EV_A);
481		1140
482	/* calculate blocking time */	1141	/* calculate blocking time */
		1142
		1143	/* we only need this for !monotonic clockor timers, but as we basically
		1144	always have timers, we just calculate it always */
		1145	#if EV_USE_MONOTONIC
		1146	if (expect_true (have_monotonic))
		1147	time_update_monotonic (EV_A);
		1148	else
		1149	#endif
		1150	{
		1151	rt_now = ev_time ();
		1152	mn_now = rt_now;
		1153	}
		1154
483	if (flags & EVLOOP_NONBLOCK || idlecnt)	1155	if (flags & EVLOOP_NONBLOCK || idlecnt)
484	block = 0.;	1156	block = 0.;
485	else	1157	else
486	{	1158	{
487	block = MAX_BLOCKTIME;	1159	block = MAX_BLOCKTIME;
488		1160
489	if (rtimercnt)	1161	if (timercnt)
490	{	1162	{
491	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1163	ev_tstamp to = ((WT)timers [0])->at - mn_now + method_fudge;
492	if (block > to) block = to;	1164	if (block > to) block = to;
493	}	1165	}
494		1166
495	if (atimercnt)	1167	if (periodiccnt)
496	{	1168	{
497	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1169	ev_tstamp to = ((WT)periodics [0])->at - rt_now + method_fudge;
498	if (block > to) block = to;	1170	if (block > to) block = to;
499	}	1171	}
500		1172
501	if (block < 0.) block = 0.;	1173	if (block < 0.) block = 0.;
502	}	1174	}
503		1175
504	method_poll (block);	1176	method_poll (EV_A_ block);
505		1177
506	/* update ev_now, do magic */	1178	/* update rt_now, do magic */
507	time_update ();	1179	time_update (EV_A);
508		1180
509	/* queue pending timers and reschedule them */	1181	/* queue pending timers and reschedule them */
510	/* absolute timers first */	1182	timers_reify (EV_A); /* relative timers called last */
511	timers_reify (atimers, atimercnt, ev_now);	1183	periodics_reify (EV_A); /* absolute timers called first */
512	/* relative timers second */
513	timers_reify (rtimers, rtimercnt, now);
514		1184
515	/* queue idle watchers unless io or timers are pending */	1185	/* queue idle watchers unless io or timers are pending */
516	if (!pendingcnt)	1186	if (!pendingcnt)
517	queue_events (idles, idlecnt, EV_IDLE);	1187	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
518		1188
519	/* queue check and possibly idle watchers */	1189	/* queue check watchers, to be executed first */
		1190	if (checkcnt)
520	queue_events (checks, checkcnt, EV_CHECK);	1191	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
521		1192
522	call_pending ();	1193	call_pending (EV_A);
523	}	1194	}
524	while (!ev_loop_done);	1195	while (activecnt && !loop_done);
		1196
		1197	if (loop_done != 2)
		1198	loop_done = 0;
		1199	}
		1200
		1201	void
		1202	ev_unloop (EV_P_ int how)
		1203	{
		1204	loop_done = how;
525	}	1205	}
526		1206
527	/*****************************************************************************/	1207	/*****************************************************************************/
528		1208
529	static void	1209	inline void
530	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1210	wlist_add (WL *head, WL elem)
531	{	1211	{
532	elem->next = *head;	1212	elem->next = *head;
533	*head = elem;	1213	*head = elem;
534	}	1214	}
535		1215
536	static void	1216	inline void
537	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1217	wlist_del (WL *head, WL elem)
538	{	1218	{
539	while (*head)	1219	while (*head)
540	{	1220	{
541	if (*head == elem)	1221	if (*head == elem)
542	{	1222	{
…		…
546		1226
547	head = &(*head)->next;	1227	head = &(*head)->next;
548	}	1228	}
549	}	1229	}
550		1230
551	static void	1231	inline void
552	ev_start (struct ev_watcher *w, int active)	1232	ev_clear_pending (EV_P_ W w)
553	{	1233	{
		1234	if (w->pending)
		1235	{
		1236	pendings [ABSPRI (w)][w->pending - 1].w = 0;
554	w->pending = 0;	1237	w->pending = 0;
		1238	}
		1239	}
		1240
		1241	inline void
		1242	ev_start (EV_P_ W w, int active)
		1243	{
		1244	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1245	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1246
555	w->active = active;	1247	w->active = active;
		1248	ev_ref (EV_A);
556	}	1249	}
557		1250
558	static void	1251	inline void
559	ev_stop (struct ev_watcher *w)	1252	ev_stop (EV_P_ W w)
560	{	1253	{
561	if (w->pending)	1254	ev_unref (EV_A);
562	pendings [w->pending - 1].w = 0;
563
564	w->active = 0;	1255	w->active = 0;
565	/* nop */
566	}	1256	}
567		1257
568	/*****************************************************************************/	1258	/*****************************************************************************/
569		1259
570	void	1260	void
571	evio_start (struct ev_io *w)	1261	ev_io_start (EV_P_ struct ev_io *w)
572	{	1262	{
		1263	int fd = w->fd;
		1264
573	if (ev_is_active (w))	1265	if (ev_is_active (w))
574	return;	1266	return;
575		1267
576	int fd = w->fd;	1268	assert (("ev_io_start called with negative fd", fd >= 0));
577		1269
578	ev_start ((struct ev_watcher *)w, 1);	1270	ev_start (EV_A_ (W)w, 1);
579	array_needsize (anfds, anfdmax, fd + 1, anfds_init);	1271	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
580	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);	1272	wlist_add ((WL *)&anfds[fd].head, (WL)w);
581		1273
582	++fdchangecnt;	1274	fd_change (EV_A_ fd);
583	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
584	fdchanges [fdchangecnt - 1] = fd;
585	}	1275	}
586		1276
587	void	1277	void
588	evio_stop (struct ev_io *w)	1278	ev_io_stop (EV_P_ struct ev_io *w)
589	{	1279	{
		1280	ev_clear_pending (EV_A_ (W)w);
590	if (!ev_is_active (w))	1281	if (!ev_is_active (w))
591	return;	1282	return;
592		1283
593	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);	1284	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
594	ev_stop ((struct ev_watcher *)w);	1285	ev_stop (EV_A_ (W)w);
595		1286
596	++fdchangecnt;	1287	fd_change (EV_A_ w->fd);
597	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
598	fdchanges [fdchangecnt - 1] = w->fd;
599	}	1288	}
600		1289
601	void	1290	void
602	evtimer_start (struct ev_timer *w)	1291	ev_timer_start (EV_P_ struct ev_timer *w)
603	{	1292	{
604	if (ev_is_active (w))	1293	if (ev_is_active (w))
605	return;	1294	return;
606		1295
607	if (w->is_abs)	1296	((WT)w)->at += mn_now;
		1297
		1298	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1299
		1300	ev_start (EV_A_ (W)w, ++timercnt);
		1301	array_needsize (timers, timermax, timercnt, (void));
		1302	timers [timercnt - 1] = w;
		1303	upheap ((WT *)timers, timercnt - 1);
		1304
		1305	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1306	}
		1307
		1308	void
		1309	ev_timer_stop (EV_P_ struct ev_timer *w)
		1310	{
		1311	ev_clear_pending (EV_A_ (W)w);
		1312	if (!ev_is_active (w))
		1313	return;
		1314
		1315	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1316
		1317	if (((W)w)->active < timercnt--)
		1318	{
		1319	timers [((W)w)->active - 1] = timers [timercnt];
		1320	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
608	{	1321	}
609	/* this formula differs from the one in timer_reify becuse we do not round up */	1322
		1323	((WT)w)->at = w->repeat;
		1324
		1325	ev_stop (EV_A_ (W)w);
		1326	}
		1327
		1328	void
		1329	ev_timer_again (EV_P_ struct ev_timer *w)
		1330	{
		1331	if (ev_is_active (w))
		1332	{
610	if (w->repeat)	1333	if (w->repeat)
611	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1334	{
612		1335	((WT)w)->at = mn_now + w->repeat;
613	ev_start ((struct ev_watcher *)w, ++atimercnt);	1336	downheap ((WT *)timers, timercnt, ((W)w)->active - 1);
614	array_needsize (atimers, atimermax, atimercnt, );	1337	}
615	atimers [atimercnt - 1] = w;
616	upheap (atimers, atimercnt - 1);
617	}
618	else	1338	else
		1339	ev_timer_stop (EV_A_ w);
619	{	1340	}
620	w->at += now;	1341	else if (w->repeat)
621		1342	ev_timer_start (EV_A_ w);
622	ev_start ((struct ev_watcher *)w, ++rtimercnt);
623	array_needsize (rtimers, rtimermax, rtimercnt, );
624	rtimers [rtimercnt - 1] = w;
625	upheap (rtimers, rtimercnt - 1);
626	}
627
628	}	1343	}
629		1344
630	void	1345	void
631	evtimer_stop (struct ev_timer *w)	1346	ev_periodic_start (EV_P_ struct ev_periodic *w)
632	{	1347	{
		1348	if (ev_is_active (w))
		1349	return;
		1350
		1351	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1352
		1353	/* this formula differs from the one in periodic_reify because we do not always round up */
		1354	if (w->interval)
		1355	((WT)w)->at += ceil ((rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1356
		1357	ev_start (EV_A_ (W)w, ++periodiccnt);
		1358	array_needsize (periodics, periodicmax, periodiccnt, (void));
		1359	periodics [periodiccnt - 1] = w;
		1360	upheap ((WT *)periodics, periodiccnt - 1);
		1361
		1362	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1363	}
		1364
		1365	void
		1366	ev_periodic_stop (EV_P_ struct ev_periodic *w)
		1367	{
		1368	ev_clear_pending (EV_A_ (W)w);
633	if (!ev_is_active (w))	1369	if (!ev_is_active (w))
634	return;	1370	return;
635		1371
636	if (w->is_abs)	1372	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
637	{	1373
638	if (w->active < atimercnt--)	1374	if (((W)w)->active < periodiccnt--)
639	{
640	atimers [w->active - 1] = atimers [atimercnt];
641	downheap (atimers, atimercnt, w->active - 1);
642	}
643	}	1375	{
644	else	1376	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1377	downheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
645	{	1378	}
646	if (w->active < rtimercnt--)
647	{
648	rtimers [w->active - 1] = rtimers [rtimercnt];
649	downheap (rtimers, rtimercnt, w->active - 1);
650	}
651	}
652		1379
653	ev_stop ((struct ev_watcher *)w);	1380	ev_stop (EV_A_ (W)w);
654	}	1381	}
655		1382
656	void	1383	void
657	evsignal_start (struct ev_signal *w)	1384	ev_idle_start (EV_P_ struct ev_idle *w)
658	{	1385	{
659	if (ev_is_active (w))	1386	if (ev_is_active (w))
660	return;	1387	return;
661		1388
662	ev_start ((struct ev_watcher *)w, 1);	1389	ev_start (EV_A_ (W)w, ++idlecnt);
		1390	array_needsize (idles, idlemax, idlecnt, (void));
		1391	idles [idlecnt - 1] = w;
		1392	}
		1393
		1394	void
		1395	ev_idle_stop (EV_P_ struct ev_idle *w)
		1396	{
		1397	ev_clear_pending (EV_A_ (W)w);
		1398	if (ev_is_active (w))
		1399	return;
		1400
		1401	idles [((W)w)->active - 1] = idles [--idlecnt];
		1402	ev_stop (EV_A_ (W)w);
		1403	}
		1404
		1405	void
		1406	ev_prepare_start (EV_P_ struct ev_prepare *w)
		1407	{
		1408	if (ev_is_active (w))
		1409	return;
		1410
		1411	ev_start (EV_A_ (W)w, ++preparecnt);
		1412	array_needsize (prepares, preparemax, preparecnt, (void));
		1413	prepares [preparecnt - 1] = w;
		1414	}
		1415
		1416	void
		1417	ev_prepare_stop (EV_P_ struct ev_prepare *w)
		1418	{
		1419	ev_clear_pending (EV_A_ (W)w);
		1420	if (ev_is_active (w))
		1421	return;
		1422
		1423	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1424	ev_stop (EV_A_ (W)w);
		1425	}
		1426
		1427	void
		1428	ev_check_start (EV_P_ struct ev_check *w)
		1429	{
		1430	if (ev_is_active (w))
		1431	return;
		1432
		1433	ev_start (EV_A_ (W)w, ++checkcnt);
		1434	array_needsize (checks, checkmax, checkcnt, (void));
		1435	checks [checkcnt - 1] = w;
		1436	}
		1437
		1438	void
		1439	ev_check_stop (EV_P_ struct ev_check *w)
		1440	{
		1441	ev_clear_pending (EV_A_ (W)w);
		1442	if (ev_is_active (w))
		1443	return;
		1444
		1445	checks [((W)w)->active - 1] = checks [--checkcnt];
		1446	ev_stop (EV_A_ (W)w);
		1447	}
		1448
		1449	#ifndef SA_RESTART
		1450	# define SA_RESTART 0
		1451	#endif
		1452
		1453	void
		1454	ev_signal_start (EV_P_ struct ev_signal *w)
		1455	{
		1456	#if EV_MULTIPLICITY
		1457	assert (("signal watchers are only supported in the default loop", loop == default_loop));
		1458	#endif
		1459	if (ev_is_active (w))
		1460	return;
		1461
		1462	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1463
		1464	ev_start (EV_A_ (W)w, 1);
663	array_needsize (signals, signalmax, w->signum, signals_init);	1465	array_needsize (signals, signalmax, w->signum, signals_init);
664	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1466	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
665		1467
666	if (!w->next)	1468	if (!((WL)w)->next)
667	{	1469	{
		1470	#if WIN32
		1471	signal (w->signum, sighandler);
		1472	#else
668	struct sigaction sa;	1473	struct sigaction sa;
669	sa.sa_handler = sighandler;	1474	sa.sa_handler = sighandler;
670	sigfillset (&sa.sa_mask);	1475	sigfillset (&sa.sa_mask);
671	sa.sa_flags = 0;	1476	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
672	sigaction (w->signum, &sa, 0);	1477	sigaction (w->signum, &sa, 0);
		1478	#endif
673	}	1479	}
674	}	1480	}
675		1481
676	void	1482	void
677	evsignal_stop (struct ev_signal *w)	1483	ev_signal_stop (EV_P_ struct ev_signal *w)
678	{	1484	{
		1485	ev_clear_pending (EV_A_ (W)w);
679	if (!ev_is_active (w))	1486	if (!ev_is_active (w))
680	return;	1487	return;
681		1488
682	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1489	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
683	ev_stop ((struct ev_watcher *)w);	1490	ev_stop (EV_A_ (W)w);
684		1491
685	if (!signals [w->signum - 1].head)	1492	if (!signals [w->signum - 1].head)
686	signal (w->signum, SIG_DFL);	1493	signal (w->signum, SIG_DFL);
687	}	1494	}
688		1495
689	void evidle_start (struct ev_idle *w)	1496	void
		1497	ev_child_start (EV_P_ struct ev_child *w)
690	{	1498	{
		1499	#if EV_MULTIPLICITY
		1500	assert (("child watchers are only supported in the default loop", loop == default_loop));
		1501	#endif
691	if (ev_is_active (w))	1502	if (ev_is_active (w))
692	return;	1503	return;
693		1504
694	ev_start ((struct ev_watcher *)w, ++idlecnt);	1505	ev_start (EV_A_ (W)w, 1);
695	array_needsize (idles, idlemax, idlecnt, );	1506	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
696	idles [idlecnt - 1] = w;
697	}	1507	}
698		1508
699	void evidle_stop (struct ev_idle *w)	1509	void
		1510	ev_child_stop (EV_P_ struct ev_child *w)
700	{	1511	{
701	idles [w->active - 1] = idles [--idlecnt];	1512	ev_clear_pending (EV_A_ (W)w);
702	ev_stop ((struct ev_watcher *)w);
703	}
704
705	void evcheck_start (struct ev_check *w)
706	{
707	if (ev_is_active (w))	1513	if (ev_is_active (w))
708	return;	1514	return;
709		1515
710	ev_start ((struct ev_watcher *)w, ++checkcnt);	1516	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
711	array_needsize (checks, checkmax, checkcnt, );	1517	ev_stop (EV_A_ (W)w);
712	checks [checkcnt - 1] = w;
713	}
714
715	void evcheck_stop (struct ev_check *w)
716	{
717	checks [w->active - 1] = checks [--checkcnt];
718	ev_stop ((struct ev_watcher *)w);
719	}	1518	}
720		1519
721	/*****************************************************************************/	1520	/*****************************************************************************/
722	#if 1
723		1521
724	static void	1522	struct ev_once
725	sin_cb (struct ev_io *w, int revents)
726	{	1523	{
727	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);
728	}
729
730	static void
731	ocb (struct ev_timer *w, int revents)
732	{
733	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);
734	evtimer_stop (w);
735	evtimer_start (w);
736	}
737
738	static void
739	scb (struct ev_signal *w, int revents)
740	{
741	fprintf (stderr, "signal %x,%d\n", revents, w->signum);
742	}
743
744	static void
745	gcb (struct ev_signal *w, int revents)
746	{
747	fprintf (stderr, "generic %x\n", revents);
748	}
749
750	int main (void)
751	{
752	struct ev_io sin;	1524	struct ev_io io;
753
754	ev_init (0);
755
756	evw_init (&sin, sin_cb, 55);
757	evio_set (&sin, 0, EV_READ);
758	evio_start (&sin);
759
760	struct ev_timer t[10000];
761
762	#if 0
763	int i;
764	for (i = 0; i < 10000; ++i)
765	{
766	struct ev_timer *w = t + i;
767	evw_init (w, ocb, i);
768	evtimer_set_abs (w, drand48 (), 0.99775533);
769	evtimer_start (w);
770	if (drand48 () < 0.5)
771	evtimer_stop (w);
772	}
773	#endif
774
775	struct ev_timer t1;	1525	struct ev_timer to;
776	evw_init (&t1, ocb, 0);	1526	void (*cb)(int revents, void *arg);
777	evtimer_set_abs (&t1, 5, 10);	1527	void *arg;
778	evtimer_start (&t1);	1528	};
779		1529
780	struct ev_signal sig;	1530	static void
781	evw_init (&sig, scb, 65535);	1531	once_cb (EV_P_ struct ev_once *once, int revents)
782	evsignal_set (&sig, SIGQUIT);	1532	{
783	evsignal_start (&sig);	1533	void (*cb)(int revents, void *arg) = once->cb;
		1534	void *arg = once->arg;
784		1535
785	struct ev_check cw;	1536	ev_io_stop (EV_A_ &once->io);
786	evw_init (&cw, gcb, 0);	1537	ev_timer_stop (EV_A_ &once->to);
787	evcheck_start (&cw);	1538	ev_free (once);
788		1539
789	struct ev_idle iw;	1540	cb (revents, arg);
790	evw_init (&iw, gcb, 0);
791	evidle_start (&iw);
792
793	ev_loop (0);
794
795	return 0;
796	}	1541	}
797		1542
798	#endif	1543	static void
		1544	once_cb_io (EV_P_ struct ev_io *w, int revents)
		1545	{
		1546	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1547	}
799		1548
		1549	static void
		1550	once_cb_to (EV_P_ struct ev_timer *w, int revents)
		1551	{
		1552	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
		1553	}
800		1554
		1555	void
		1556	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
		1557	{
		1558	struct ev_once *once = ev_malloc (sizeof (struct ev_once));
801		1559
		1560	if (!once)
		1561	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
		1562	else
		1563	{
		1564	once->cb = cb;
		1565	once->arg = arg;
802		1566
		1567	ev_watcher_init (&once->io, once_cb_io);
		1568	if (fd >= 0)
		1569	{
		1570	ev_io_set (&once->io, fd, events);
		1571	ev_io_start (EV_A_ &once->io);
		1572	}
		1573
		1574	ev_watcher_init (&once->to, once_cb_to);
		1575	if (timeout >= 0.)
		1576	{
		1577	ev_timer_set (&once->to, timeout, 0.);
		1578	ev_timer_start (EV_A_ &once->to);
		1579	}
		1580	}
		1581	}
		1582

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