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Comparing libev/ev.c (file contents):
Revision 1.3 by root, Tue Oct 30 21:45:00 2007 UTC vs.
Revision 1.137 by root, Sat Nov 24 08:28:10 2007 UTC

		1	/*
		2	* libev event processing core, watcher management
		3	*
		4	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
		5	* All rights reserved.
		6	*
		7	* Redistribution and use in source and binary forms, with or without
		8	* modification, are permitted provided that the following conditions are
		9	* met:
		10	*
		11	* * Redistributions of source code must retain the above copyright
		12	* notice, this list of conditions and the following disclaimer.
		13	*
		14	* * Redistributions in binary form must reproduce the above
		15	* copyright notice, this list of conditions and the following
		16	* disclaimer in the documentation and/or other materials provided
		17	* with the distribution.
		18	*
		19	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
		20	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
		21	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
		22	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
		23	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
		24	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
		25	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		26	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		27	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		28	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
		29	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		30	*/
		31
		32	#ifdef __cplusplus
		33	extern "C" {
		34	#endif
		35
		36	#ifndef EV_STANDALONE
		37	# ifdef EV_CONFIG_H
		38	# include EV_CONFIG_H
		39	# else
		40	# include "config.h"
		41	# endif
		42
		43	# if HAVE_CLOCK_GETTIME
		44	# ifndef EV_USE_MONOTONIC
		45	# define EV_USE_MONOTONIC 1
		46	# endif
		47	# ifndef EV_USE_REALTIME
		48	# define EV_USE_REALTIME 1
		49	# endif
		50	# else
		51	# ifndef EV_USE_MONOTONIC
		52	# define EV_USE_MONOTONIC 0
		53	# endif
		54	# ifndef EV_USE_REALTIME
		55	# define EV_USE_REALTIME 0
		56	# endif
		57	# endif
		58
		59	# ifndef EV_USE_SELECT
		60	# if HAVE_SELECT && HAVE_SYS_SELECT_H
		61	# define EV_USE_SELECT 1
		62	# else
		63	# define EV_USE_SELECT 0
		64	# endif
		65	# endif
		66
		67	# ifndef EV_USE_POLL
		68	# if HAVE_POLL && HAVE_POLL_H
		69	# define EV_USE_POLL 1
		70	# else
		71	# define EV_USE_POLL 0
		72	# endif
		73	# endif
		74
		75	# ifndef EV_USE_EPOLL
		76	# if HAVE_EPOLL_CTL && HAVE_SYS_EPOLL_H
		77	# define EV_USE_EPOLL 1
		78	# else
		79	# define EV_USE_EPOLL 0
		80	# endif
		81	# endif
		82
		83	# ifndef EV_USE_KQUEUE
		84	# if HAVE_KQUEUE && HAVE_SYS_EVENT_H && HAVE_SYS_QUEUE_H
		85	# define EV_USE_KQUEUE 1
		86	# else
		87	# define EV_USE_KQUEUE 0
		88	# endif
		89	# endif
		90
		91	# ifndef EV_USE_PORT
		92	# if HAVE_PORT_H && HAVE_PORT_CREATE
		93	# define EV_USE_PORT 1
		94	# else
		95	# define EV_USE_PORT 0
		96	# endif
		97	# endif
		98
		99	#endif
		100
1	#include <math.h>	101	#include <math.h>
2	#include <stdlib.h>	102	#include <stdlib.h>
		103	#include <fcntl.h>
		104	#include <stddef.h>
3		105
4	#include <stdio.h>	106	#include <stdio.h>
5		107
		108	#include <assert.h>
6	#include <errno.h>	109	#include <errno.h>
7	#include <sys/time.h>	110	#include <sys/types.h>
8	#include <time.h>	111	#include <time.h>
9		112
		113	#include <signal.h>
		114
		115	#ifndef _WIN32
		116	# include <unistd.h>
		117	# include <sys/time.h>
		118	# include <sys/wait.h>
		119	#else
		120	# define WIN32_LEAN_AND_MEAN
		121	# include <windows.h>
		122	# ifndef EV_SELECT_IS_WINSOCKET
		123	# define EV_SELECT_IS_WINSOCKET 1
		124	# endif
		125	#endif
		126
		127	/**/
		128
		129	#ifndef EV_USE_MONOTONIC
		130	# define EV_USE_MONOTONIC 0
		131	#endif
		132
		133	#ifndef EV_USE_REALTIME
		134	# define EV_USE_REALTIME 0
		135	#endif
		136
		137	#ifndef EV_USE_SELECT
		138	# define EV_USE_SELECT 1
		139	#endif
		140
		141	#ifndef EV_USE_POLL
		142	# ifdef _WIN32
		143	# define EV_USE_POLL 0
		144	# else
		145	# define EV_USE_POLL 1
		146	# endif
		147	#endif
		148
		149	#ifndef EV_USE_EPOLL
		150	# define EV_USE_EPOLL 0
		151	#endif
		152
		153	#ifndef EV_USE_KQUEUE
		154	# define EV_USE_KQUEUE 0
		155	#endif
		156
		157	#ifndef EV_USE_PORT
		158	# define EV_USE_PORT 0
		159	#endif
		160
		161	/**/
		162
10	#ifdef CLOCK_MONOTONIC	163	#ifndef CLOCK_MONOTONIC
		164	# undef EV_USE_MONOTONIC
11	# define HAVE_MONOTONIC 1	165	# define EV_USE_MONOTONIC 0
12	#endif	166	#endif
13		167
14	#define HAVE_EPOLL 1	168	#ifndef CLOCK_REALTIME
		169	# undef EV_USE_REALTIME
15	#define HAVE_REALTIME 1	170	# define EV_USE_REALTIME 0
16	#define HAVE_SELECT 0	171	#endif
17		172
18	#define MAX_BLOCKTIME 60.	173	#if EV_SELECT_IS_WINSOCKET
		174	# include <winsock.h>
		175	#endif
19		176
		177	/**/
		178
		179	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
		180	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		181	#define PID_HASHSIZE 16 /* size of pid hash table, must be power of two */
		182	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds */
		183
		184	#ifdef EV_H
		185	# include EV_H
		186	#else
20	#include "ev.h"	187	# include "ev.h"
		188	#endif
21		189
22	struct ev_watcher {	190	#if __GNUC__ >= 3
23	EV_WATCHER (ev_watcher);	191	# define expect(expr,value) __builtin_expect ((expr),(value))
24	};	192	# define inline static inline
		193	#else
		194	# define expect(expr,value) (expr)
		195	# define inline static
		196	#endif
25		197
26	struct ev_watcher_list {	198	#define expect_false(expr) expect ((expr) != 0, 0)
27	EV_WATCHER_LIST (ev_watcher_list);	199	#define expect_true(expr) expect ((expr) != 0, 1)
28	};
29		200
		201	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		202	#define ABSPRI(w) ((w)->priority - EV_MINPRI)
		203
		204	#define EMPTY0 /* required for microsofts broken pseudo-c compiler */
		205	#define EMPTY2(a,b) /* used to suppress some warnings */
		206
		207	typedef ev_watcher *W;
		208	typedef ev_watcher_list *WL;
		209	typedef ev_watcher_time *WT;
		210
		211	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		212
		213	#ifdef _WIN32
		214	# include "ev_win32.c"
		215	#endif
		216
		217	/*****************************************************************************/
		218
		219	static void (*syserr_cb)(const char *msg);
		220
		221	void ev_set_syserr_cb (void (*cb)(const char *msg))
		222	{
		223	syserr_cb = cb;
		224	}
		225
		226	static void
		227	syserr (const char *msg)
		228	{
		229	if (!msg)
		230	msg = "(libev) system error";
		231
		232	if (syserr_cb)
		233	syserr_cb (msg);
		234	else
		235	{
		236	perror (msg);
		237	abort ();
		238	}
		239	}
		240
		241	static void *(*alloc)(void *ptr, long size);
		242
		243	void ev_set_allocator (void *(*cb)(void *ptr, long size))
		244	{
		245	alloc = cb;
		246	}
		247
		248	static void *
		249	ev_realloc (void *ptr, long size)
		250	{
		251	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		252
		253	if (!ptr && size)
		254	{
		255	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		256	abort ();
		257	}
		258
		259	return ptr;
		260	}
		261
		262	#define ev_malloc(size) ev_realloc (0, (size))
		263	#define ev_free(ptr) ev_realloc ((ptr), 0)
		264
		265	/*****************************************************************************/
		266
		267	typedef struct
		268	{
		269	WL head;
		270	unsigned char events;
		271	unsigned char reify;
		272	#if EV_SELECT_IS_WINSOCKET
		273	SOCKET handle;
		274	#endif
		275	} ANFD;
		276
		277	typedef struct
		278	{
		279	W w;
		280	int events;
		281	} ANPENDING;
		282
		283	#if EV_MULTIPLICITY
		284
		285	struct ev_loop
		286	{
		287	ev_tstamp ev_rt_now;
		288	#define ev_rt_now ((loop)->ev_rt_now)
		289	#define VAR(name,decl) decl;
		290	#include "ev_vars.h"
		291	#undef VAR
		292	};
		293	#include "ev_wrap.h"
		294
		295	static struct ev_loop default_loop_struct;
		296	struct ev_loop *ev_default_loop_ptr;
		297
		298	#else
		299
30	ev_tstamp ev_now;	300	ev_tstamp ev_rt_now;
31	int ev_method;	301	#define VAR(name,decl) static decl;
		302	#include "ev_vars.h"
		303	#undef VAR
32		304
33	static int have_monotonic; /* runtime */	305	static int ev_default_loop_ptr;
34		306
35	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	307	#endif
36	static void (*method_reify)(void);	308
37	static void (*method_poll)(ev_tstamp timeout);	309	/*****************************************************************************/
38		310
39	ev_tstamp	311	ev_tstamp
40	ev_time (void)	312	ev_time (void)
41	{	313	{
42	#if HAVE_REALTIME	314	#if EV_USE_REALTIME
43	struct timespec ts;	315	struct timespec ts;
44	clock_gettime (CLOCK_REALTIME, &ts);	316	clock_gettime (CLOCK_REALTIME, &ts);
45	return ts.tv_sec + ts.tv_nsec * 1e-9;	317	return ts.tv_sec + ts.tv_nsec * 1e-9;
46	#else	318	#else
47	struct timeval tv;	319	struct timeval tv;
48	gettimeofday (&tv, 0);	320	gettimeofday (&tv, 0);
49	return tv.tv_sec + tv.tv_usec * 1e-6;	321	return tv.tv_sec + tv.tv_usec * 1e-6;
50	#endif	322	#endif
51	}	323	}
52		324
53	static ev_tstamp	325	inline ev_tstamp
54	get_clock (void)	326	get_clock (void)
55	{	327	{
56	#if HAVE_MONOTONIC	328	#if EV_USE_MONOTONIC
57	if (have_monotonic)	329	if (expect_true (have_monotonic))
58	{	330	{
59	struct timespec ts;	331	struct timespec ts;
60	clock_gettime (CLOCK_MONOTONIC, &ts);	332	clock_gettime (CLOCK_MONOTONIC, &ts);
61	return ts.tv_sec + ts.tv_nsec * 1e-9;	333	return ts.tv_sec + ts.tv_nsec * 1e-9;
62	}	334	}
63	#endif	335	#endif
64		336
65	return ev_time ();	337	return ev_time ();
66	}	338	}
67		339
		340	#if EV_MULTIPLICITY
		341	ev_tstamp
		342	ev_now (EV_P)
		343	{
		344	return ev_rt_now;
		345	}
		346	#endif
		347
		348	#define array_roundsize(type,n) (((n) | 4) & ~3)
		349
68	#define array_needsize(base,cur,cnt,init) \	350	#define array_needsize(type,base,cur,cnt,init) \
69	if ((cnt) > cur) \	351	if (expect_false ((cnt) > cur)) \
70	{ \	352	{ \
71	int newcnt = cur ? cur << 1 : 16; \	353	int newcnt = cur; \
72	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	354	do \
		355	{ \
		356	newcnt = array_roundsize (type, newcnt << 1); \
		357	} \
		358	while ((cnt) > newcnt); \
		359	\
73	base = realloc (base, sizeof (*base) * (newcnt)); \	360	base = (type *)ev_realloc (base, sizeof (type) * (newcnt));\
74	init (base + cur, newcnt - cur); \	361	init (base + cur, newcnt - cur); \
75	cur = newcnt; \	362	cur = newcnt; \
		363	}
		364
		365	#define array_slim(type,stem) \
		366	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		367	{ \
		368	stem ## max = array_roundsize (stem ## cnt >> 1); \
		369	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		370	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		371	}
		372
		373	#define array_free(stem, idx) \
		374	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		375
		376	/*****************************************************************************/
		377
		378	static void
		379	anfds_init (ANFD *base, int count)
		380	{
		381	while (count--)
		382	{
		383	base->head = 0;
		384	base->events = EV_NONE;
		385	base->reify = 0;
		386
		387	++base;
		388	}
		389	}
		390
		391	void
		392	ev_feed_event (EV_P_ void *w, int revents)
		393	{
		394	W w_ = (W)w;
		395
		396	if (expect_false (w_->pending))
		397	{
		398	pendings [ABSPRI (w_)][w_->pending - 1].events |= revents;
		399	return;
		400	}
		401
		402	w_->pending = ++pendingcnt [ABSPRI (w_)];
		403	array_needsize (ANPENDING, pendings [ABSPRI (w_)], pendingmax [ABSPRI (w_)], pendingcnt [ABSPRI (w_)], EMPTY2);
		404	pendings [ABSPRI (w_)][w_->pending - 1].w = w_;
		405	pendings [ABSPRI (w_)][w_->pending - 1].events = revents;
		406	}
		407
		408	static void
		409	queue_events (EV_P_ W *events, int eventcnt, int type)
		410	{
		411	int i;
		412
		413	for (i = 0; i < eventcnt; ++i)
		414	ev_feed_event (EV_A_ events [i], type);
		415	}
		416
		417	inline void
		418	fd_event (EV_P_ int fd, int revents)
		419	{
		420	ANFD *anfd = anfds + fd;
		421	ev_io *w;
		422
		423	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		424	{
		425	int ev = w->events & revents;
		426
		427	if (ev)
		428	ev_feed_event (EV_A_ (W)w, ev);
		429	}
		430	}
		431
		432	void
		433	ev_feed_fd_event (EV_P_ int fd, int revents)
		434	{
		435	fd_event (EV_A_ fd, revents);
		436	}
		437
		438	/*****************************************************************************/
		439
		440	inline void
		441	fd_reify (EV_P)
		442	{
		443	int i;
		444
		445	for (i = 0; i < fdchangecnt; ++i)
		446	{
		447	int fd = fdchanges [i];
		448	ANFD *anfd = anfds + fd;
		449	ev_io *w;
		450
		451	int events = 0;
		452
		453	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		454	events |= w->events;
		455
		456	#if EV_SELECT_IS_WINSOCKET
		457	if (events)
		458	{
		459	unsigned long argp;
		460	anfd->handle = _get_osfhandle (fd);
		461	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		462	}
		463	#endif
		464
		465	anfd->reify = 0;
		466
		467	backend_modify (EV_A_ fd, anfd->events, events);
		468	anfd->events = events;
		469	}
		470
		471	fdchangecnt = 0;
		472	}
		473
		474	static void
		475	fd_change (EV_P_ int fd)
		476	{
		477	if (expect_false (anfds [fd].reify))
		478	return;
		479
		480	anfds [fd].reify = 1;
		481
		482	++fdchangecnt;
		483	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		484	fdchanges [fdchangecnt - 1] = fd;
		485	}
		486
		487	static void
		488	fd_kill (EV_P_ int fd)
		489	{
		490	ev_io *w;
		491
		492	while ((w = (ev_io *)anfds [fd].head))
		493	{
		494	ev_io_stop (EV_A_ w);
		495	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		496	}
		497	}
		498
		499	inline int
		500	fd_valid (int fd)
		501	{
		502	#ifdef _WIN32
		503	return _get_osfhandle (fd) != -1;
		504	#else
		505	return fcntl (fd, F_GETFD) != -1;
		506	#endif
		507	}
		508
		509	/* called on EBADF to verify fds */
		510	static void
		511	fd_ebadf (EV_P)
		512	{
		513	int fd;
		514
		515	for (fd = 0; fd < anfdmax; ++fd)
		516	if (anfds [fd].events)
		517	if (!fd_valid (fd) == -1 && errno == EBADF)
		518	fd_kill (EV_A_ fd);
		519	}
		520
		521	/* called on ENOMEM in select/poll to kill some fds and retry */
		522	static void
		523	fd_enomem (EV_P)
		524	{
		525	int fd;
		526
		527	for (fd = anfdmax; fd--; )
		528	if (anfds [fd].events)
		529	{
		530	fd_kill (EV_A_ fd);
		531	return;
76	}	532	}
		533	}
		534
		535	/* usually called after fork if backend needs to re-arm all fds from scratch */
		536	static void
		537	fd_rearm_all (EV_P)
		538	{
		539	int fd;
		540
		541	/* this should be highly optimised to not do anything but set a flag */
		542	for (fd = 0; fd < anfdmax; ++fd)
		543	if (anfds [fd].events)
		544	{
		545	anfds [fd].events = 0;
		546	fd_change (EV_A_ fd);
		547	}
		548	}
		549
		550	/*****************************************************************************/
		551
		552	static void
		553	upheap (WT *heap, int k)
		554	{
		555	WT w = heap [k];
		556
		557	while (k && heap [k >> 1]->at > w->at)
		558	{
		559	heap [k] = heap [k >> 1];
		560	((W)heap [k])->active = k + 1;
		561	k >>= 1;
		562	}
		563
		564	heap [k] = w;
		565	((W)heap [k])->active = k + 1;
		566
		567	}
		568
		569	static void
		570	downheap (WT *heap, int N, int k)
		571	{
		572	WT w = heap [k];
		573
		574	while (k < (N >> 1))
		575	{
		576	int j = k << 1;
		577
		578	if (j + 1 < N && heap [j]->at > heap [j + 1]->at)
		579	++j;
		580
		581	if (w->at <= heap [j]->at)
		582	break;
		583
		584	heap [k] = heap [j];
		585	((W)heap [k])->active = k + 1;
		586	k = j;
		587	}
		588
		589	heap [k] = w;
		590	((W)heap [k])->active = k + 1;
		591	}
		592
		593	inline void
		594	adjustheap (WT *heap, int N, int k)
		595	{
		596	upheap (heap, k);
		597	downheap (heap, N, k);
		598	}
		599
		600	/*****************************************************************************/
77		601
78	typedef struct	602	typedef struct
79	{	603	{
80	struct ev_io *head;	604	WL head;
81	unsigned char wev, rev; /* want, received event set */	605	sig_atomic_t volatile gotsig;
82	} ANFD;	606	} ANSIG;
83		607
84	static ANFD *anfds;	608	static ANSIG *signals;
85	static int anfdmax;	609	static int signalmax;
86		610
87	static int *fdchanges;	611	static int sigpipe [2];
88	static int fdchangemax, fdchangecnt;	612	static sig_atomic_t volatile gotsig;
		613	static ev_io sigev;
89		614
90	static void	615	static void
91	anfds_init (ANFD *base, int count)	616	signals_init (ANSIG *base, int count)
92	{	617	{
93	while (count--)	618	while (count--)
94	{	619	{
95	base->head = 0;	620	base->head = 0;
96	base->wev = base->rev = EV_NONE;	621	base->gotsig = 0;
		622
97	++base;	623	++base;
98	}	624	}
99	}	625	}
100		626
101	typedef struct
102	{
103	struct ev_watcher *w;
104	int events;
105	} ANPENDING;
106
107	static ANPENDING *pendings;
108	static int pendingmax, pendingcnt;
109
110	static void	627	static void
111	event (struct ev_watcher *w, int events)	628	sighandler (int signum)
112	{	629	{
113	w->pending = ++pendingcnt;	630	#if _WIN32
114	array_needsize (pendings, pendingmax, pendingcnt, );	631	signal (signum, sighandler);
115	pendings [pendingcnt - 1].w = w;	632	#endif
116	pendings [pendingcnt - 1].events = events;
117	}
118		633
119	static void	634	signals [signum - 1].gotsig = 1;
120	fd_event (int fd, int events)
121	{
122	ANFD *anfd = anfds + fd;
123	struct ev_io *w;
124		635
		636	if (!gotsig)
		637	{
		638	int old_errno = errno;
		639	gotsig = 1;
		640	write (sigpipe [1], &signum, 1);
		641	errno = old_errno;
		642	}
		643	}
		644
		645	void
		646	ev_feed_signal_event (EV_P_ int signum)
		647	{
		648	WL w;
		649
		650	#if EV_MULTIPLICITY
		651	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		652	#endif
		653
		654	--signum;
		655
		656	if (signum < 0 || signum >= signalmax)
		657	return;
		658
		659	signals [signum].gotsig = 0;
		660
125	for (w = anfd->head; w; w = w->next)	661	for (w = signals [signum].head; w; w = w->next)
		662	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
		663	}
		664
		665	static void
		666	sigcb (EV_P_ ev_io *iow, int revents)
		667	{
		668	int signum;
		669
		670	read (sigpipe [0], &revents, 1);
		671	gotsig = 0;
		672
		673	for (signum = signalmax; signum--; )
		674	if (signals [signum].gotsig)
		675	ev_feed_signal_event (EV_A_ signum + 1);
		676	}
		677
		678	static void
		679	fd_intern (int fd)
		680	{
		681	#ifdef _WIN32
		682	int arg = 1;
		683	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		684	#else
		685	fcntl (fd, F_SETFD, FD_CLOEXEC);
		686	fcntl (fd, F_SETFL, O_NONBLOCK);
		687	#endif
		688	}
		689
		690	static void
		691	siginit (EV_P)
		692	{
		693	fd_intern (sigpipe [0]);
		694	fd_intern (sigpipe [1]);
		695
		696	ev_io_set (&sigev, sigpipe [0], EV_READ);
		697	ev_io_start (EV_A_ &sigev);
		698	ev_unref (EV_A); /* child watcher should not keep loop alive */
		699	}
		700
		701	/*****************************************************************************/
		702
		703	static ev_child *childs [PID_HASHSIZE];
		704
		705	#ifndef _WIN32
		706
		707	static ev_signal childev;
		708
		709	#ifndef WCONTINUED
		710	# define WCONTINUED 0
		711	#endif
		712
		713	static void
		714	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		715	{
		716	ev_child *w;
		717
		718	for (w = (ev_child *)childs [chain & (PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		719	if (w->pid == pid || !w->pid)
126	{	720	{
127	int ev = w->events & events;	721	ev_priority (w) = ev_priority (sw); /* need to do it *now* */
128		722	w->rpid = pid;
129	if (ev)	723	w->rstatus = status;
130	event ((struct ev_watcher *)w, ev);	724	ev_feed_event (EV_A_ (W)w, EV_CHILD);
131	}	725	}
132	}	726	}
133		727
134	static struct ev_timer **timers;
135	static int timermax, timercnt;
136
137	static void	728	static void
138	upheap (int k)	729	childcb (EV_P_ ev_signal *sw, int revents)
139	{	730	{
140	struct ev_timer *w = timers [k];	731	int pid, status;
141		732
142	while (k && timers [k >> 1]->at > w->at)	733	if (0 < (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
143	{
144	timers [k] = timers [k >> 1];
145	timers [k]->active = k + 1;
146	k >>= 1;
147	}	734	{
		735	/* make sure we are called again until all childs have been reaped */
		736	/* we need to do it this way so that the callback gets called before we continue */
		737	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
148		738
149	timers [k] = w;	739	child_reap (EV_A_ sw, pid, pid, status);
150	timers [k]->active = k + 1;	740	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
151
152	}
153
154	static void
155	downheap (int k)
156	{
157	struct ev_timer *w = timers [k];
158
159	while (k < (timercnt >> 1))
160	{	741	}
161	int j = k << 1;
162
163	if (j + 1 < timercnt && timers [j]->at > timers [j + 1]->at)
164	++j;
165
166	if (w->at <= timers [j]->at)
167	break;
168
169	timers [k] = timers [j];
170	timers [k]->active = k + 1;
171	k = j;
172	}
173
174	timers [k] = w;
175	timers [k]->active = k + 1;
176	}	742	}
177		743
178	static struct ev_signal **signals;	744	#endif
179	static int signalmax, signalcnt;
180		745
181	static void	746	/*****************************************************************************/
182	signals_init (struct ev_signal **base, int count)
183	{
184	while (count--)
185	*base++ = 0;
186	}
187		747
		748	#if EV_USE_PORT
		749	# include "ev_port.c"
		750	#endif
		751	#if EV_USE_KQUEUE
		752	# include "ev_kqueue.c"
		753	#endif
188	#if HAVE_EPOLL	754	#if EV_USE_EPOLL
189	# include "ev_epoll.c"	755	# include "ev_epoll.c"
190	#endif	756	#endif
		757	#if EV_USE_POLL
		758	# include "ev_poll.c"
		759	#endif
191	#if HAVE_SELECT	760	#if EV_USE_SELECT
192	# include "ev_select.c"	761	# include "ev_select.c"
193	#endif	762	#endif
194		763
195	int ev_init (int flags)	764	int
		765	ev_version_major (void)
196	{	766	{
		767	return EV_VERSION_MAJOR;
		768	}
		769
		770	int
		771	ev_version_minor (void)
		772	{
		773	return EV_VERSION_MINOR;
		774	}
		775
		776	/* return true if we are running with elevated privileges and should ignore env variables */
		777	static int
		778	enable_secure (void)
		779	{
		780	#ifdef _WIN32
		781	return 0;
		782	#else
		783	return getuid () != geteuid ()
		784	|| getgid () != getegid ();
		785	#endif
		786	}
		787
		788	unsigned int
		789	ev_supported_backends (void)
		790	{
		791	unsigned int flags = 0;
		792
		793	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		794	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		795	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		796	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		797	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		798
		799	return flags;
		800	}
		801
		802	unsigned int
		803	ev_recommended_backends (void)
		804	{
		805	unsigned int flags = ev_supported_backends ();
		806
		807	#ifndef __NetBSD__
		808	/* kqueue is borked on everything but netbsd apparently */
		809	/* it usually doesn't work correctly on anything but sockets and pipes */
		810	flags &= ~EVBACKEND_KQUEUE;
		811	#endif
		812	#ifdef __APPLE__
		813	// flags &= ~EVBACKEND_KQUEUE; for documentation
		814	flags &= ~EVBACKEND_POLL;
		815	#endif
		816
		817	return flags;
		818	}
		819
		820	unsigned int
		821	ev_embeddable_backends (void)
		822	{
		823	return EVBACKEND_EPOLL
		824	| EVBACKEND_KQUEUE
		825	| EVBACKEND_PORT;
		826	}
		827
		828	unsigned int
		829	ev_backend (EV_P)
		830	{
		831	return backend;
		832	}
		833
		834	static void
		835	loop_init (EV_P_ unsigned int flags)
		836	{
		837	if (!backend)
		838	{
197	#if HAVE_MONOTONIC	839	#if EV_USE_MONOTONIC
198	{	840	{
199	struct timespec ts;	841	struct timespec ts;
200	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	842	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
201	have_monotonic = 1;	843	have_monotonic = 1;
202	}	844	}
203	#endif	845	#endif
204		846
205	ev_now = ev_time ();	847	ev_rt_now = ev_time ();
		848	mn_now = get_clock ();
		849	now_floor = mn_now;
		850	rtmn_diff = ev_rt_now - mn_now;
206		851
		852	if (!(flags & EVFLAG_NOENV)
		853	&& !enable_secure ()
		854	&& getenv ("LIBEV_FLAGS"))
		855	flags = atoi (getenv ("LIBEV_FLAGS"));
		856
		857	if (!(flags & 0x0000ffffUL))
		858	flags |= ev_recommended_backends ();
		859
		860	backend = 0;
		861	#if EV_USE_PORT
		862	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		863	#endif
		864	#if EV_USE_KQUEUE
		865	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		866	#endif
207	#if HAVE_EPOLL	867	#if EV_USE_EPOLL
208	if (epoll_init (flags))	868	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
209	return ev_method;
210	#endif	869	#endif
		870	#if EV_USE_POLL
		871	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		872	#endif
211	#if HAVE_SELECT	873	#if EV_USE_SELECT
212	if (select_init (flags))	874	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
213	return ev_method;
214	#endif	875	#endif
215		876
216	ev_method = EVMETHOD_NONE;	877	ev_init (&sigev, sigcb);
217	return ev_method;	878	ev_set_priority (&sigev, EV_MAXPRI);
		879	}
218	}	880	}
219		881
220	void ev_prefork (void)
221	{
222	}
223
224	void ev_postfork_parent (void)
225	{
226	}
227
228	void ev_postfork_child (void)
229	{
230	#if HAVE_EPOLL
231	epoll_postfork_child ();
232	#endif
233	}
234
235	static void	882	static void
236	call_pending ()	883	loop_destroy (EV_P)
237	{	884	{
238	int i;	885	int i;
239		886
240	for (i = 0; i < pendingcnt; ++i)	887	#if EV_USE_PORT
		888	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		889	#endif
		890	#if EV_USE_KQUEUE
		891	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		892	#endif
		893	#if EV_USE_EPOLL
		894	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		895	#endif
		896	#if EV_USE_POLL
		897	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		898	#endif
		899	#if EV_USE_SELECT
		900	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		901	#endif
		902
		903	for (i = NUMPRI; i--; )
		904	array_free (pending, [i]);
		905
		906	/* have to use the microsoft-never-gets-it-right macro */
		907	array_free (fdchange, EMPTY0);
		908	array_free (timer, EMPTY0);
		909	#if EV_PERIODICS
		910	array_free (periodic, EMPTY0);
		911	#endif
		912	array_free (idle, EMPTY0);
		913	array_free (prepare, EMPTY0);
		914	array_free (check, EMPTY0);
		915
		916	backend = 0;
		917	}
		918
		919	static void
		920	loop_fork (EV_P)
		921	{
		922	#if EV_USE_PORT
		923	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		924	#endif
		925	#if EV_USE_KQUEUE
		926	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		927	#endif
		928	#if EV_USE_EPOLL
		929	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		930	#endif
		931
		932	if (ev_is_active (&sigev))
		933	{
		934	/* default loop */
		935
		936	ev_ref (EV_A);
		937	ev_io_stop (EV_A_ &sigev);
		938	close (sigpipe [0]);
		939	close (sigpipe [1]);
		940
		941	while (pipe (sigpipe))
		942	syserr ("(libev) error creating pipe");
		943
		944	siginit (EV_A);
241	{	945	}
242	ANPENDING *p = pendings + i;
243		946
244	if (p->w)	947	postfork = 0;
		948	}
		949
		950	#if EV_MULTIPLICITY
		951	struct ev_loop *
		952	ev_loop_new (unsigned int flags)
		953	{
		954	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		955
		956	memset (loop, 0, sizeof (struct ev_loop));
		957
		958	loop_init (EV_A_ flags);
		959
		960	if (ev_backend (EV_A))
		961	return loop;
		962
		963	return 0;
		964	}
		965
		966	void
		967	ev_loop_destroy (EV_P)
		968	{
		969	loop_destroy (EV_A);
		970	ev_free (loop);
		971	}
		972
		973	void
		974	ev_loop_fork (EV_P)
		975	{
		976	postfork = 1;
		977	}
		978
		979	#endif
		980
		981	#if EV_MULTIPLICITY
		982	struct ev_loop *
		983	ev_default_loop_init (unsigned int flags)
		984	#else
		985	int
		986	ev_default_loop (unsigned int flags)
		987	#endif
		988	{
		989	if (sigpipe [0] == sigpipe [1])
		990	if (pipe (sigpipe))
		991	return 0;
		992
		993	if (!ev_default_loop_ptr)
		994	{
		995	#if EV_MULTIPLICITY
		996	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		997	#else
		998	ev_default_loop_ptr = 1;
		999	#endif
		1000
		1001	loop_init (EV_A_ flags);
		1002
		1003	if (ev_backend (EV_A))
245	{	1004	{
246	p->w->pending = 0;	1005	siginit (EV_A);
247	p->w->cb (p->w, p->events);	1006
		1007	#ifndef _WIN32
		1008	ev_signal_init (&childev, childcb, SIGCHLD);
		1009	ev_set_priority (&childev, EV_MAXPRI);
		1010	ev_signal_start (EV_A_ &childev);
		1011	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1012	#endif
248	}	1013	}
		1014	else
		1015	ev_default_loop_ptr = 0;
		1016	}
		1017
		1018	return ev_default_loop_ptr;
		1019	}
		1020
		1021	void
		1022	ev_default_destroy (void)
		1023	{
		1024	#if EV_MULTIPLICITY
		1025	struct ev_loop *loop = ev_default_loop_ptr;
		1026	#endif
		1027
		1028	#ifndef _WIN32
		1029	ev_ref (EV_A); /* child watcher */
		1030	ev_signal_stop (EV_A_ &childev);
		1031	#endif
		1032
		1033	ev_ref (EV_A); /* signal watcher */
		1034	ev_io_stop (EV_A_ &sigev);
		1035
		1036	close (sigpipe [0]); sigpipe [0] = 0;
		1037	close (sigpipe [1]); sigpipe [1] = 0;
		1038
		1039	loop_destroy (EV_A);
		1040	}
		1041
		1042	void
		1043	ev_default_fork (void)
		1044	{
		1045	#if EV_MULTIPLICITY
		1046	struct ev_loop *loop = ev_default_loop_ptr;
		1047	#endif
		1048
		1049	if (backend)
		1050	postfork = 1;
		1051	}
		1052
		1053	/*****************************************************************************/
		1054
		1055	static int
		1056	any_pending (EV_P)
		1057	{
		1058	int pri;
		1059
		1060	for (pri = NUMPRI; pri--; )
		1061	if (pendingcnt [pri])
		1062	return 1;
		1063
		1064	return 0;
		1065	}
		1066
		1067	inline void
		1068	call_pending (EV_P)
		1069	{
		1070	int pri;
		1071
		1072	for (pri = NUMPRI; pri--; )
		1073	while (pendingcnt [pri])
		1074	{
		1075	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
		1076
		1077	if (expect_true (p->w))
		1078	{
		1079	p->w->pending = 0;
		1080	EV_CB_INVOKE (p->w, p->events);
		1081	}
249	}	1082	}
250
251	pendingcnt = 0;
252	}	1083	}
253		1084
254	static void	1085	inline void
255	timer_reify (void)	1086	timers_reify (EV_P)
256	{	1087	{
257	while (timercnt && timers [0]->at <= ev_now)	1088	while (timercnt && ((WT)timers [0])->at <= mn_now)
258	{	1089	{
259	struct ev_timer *w = timers [0];	1090	ev_timer *w = timers [0];
260		1091
		1092	assert (("inactive timer on timer heap detected", ev_is_active (w)));
		1093
261	/* first reschedule timer */	1094	/* first reschedule or stop timer */
262	if (w->repeat)	1095	if (w->repeat)
263	{	1096	{
264	if (w->is_abs)	1097	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
265	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1098
266	else
267	w->at = ev_now + w->repeat;	1099	((WT)w)->at += w->repeat;
		1100	if (((WT)w)->at < mn_now)
		1101	((WT)w)->at = mn_now;
268		1102
269	downheap (0);	1103	downheap ((WT *)timers, timercnt, 0);
270	}	1104	}
271	else	1105	else
272	evtimer_stop (w); /* nonrepeating: stop timer */	1106	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
273		1107
274	event ((struct ev_watcher *)w, EV_TIMEOUT);	1108	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
275	}
276	}
277
278	int ev_loop_done;
279
280	int ev_loop (int flags)
281	{
282	double block;
283	ev_loop_done = flags & EVLOOP_ONESHOT;
284
285	do
286	{	1109	}
		1110	}
		1111
		1112	#if EV_PERIODICS
		1113	inline void
		1114	periodics_reify (EV_P)
		1115	{
		1116	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1117	{
		1118	ev_periodic *w = periodics [0];
		1119
		1120	assert (("inactive timer on periodic heap detected", ev_is_active (w)));
		1121
		1122	/* first reschedule or stop timer */
		1123	if (w->reschedule_cb)
		1124	{
		1125	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + 0.0001);
		1126	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1127	downheap ((WT *)periodics, periodiccnt, 0);
		1128	}
		1129	else if (w->interval)
		1130	{
		1131	((WT)w)->at += floor ((ev_rt_now - ((WT)w)->at) / w->interval + 1.) * w->interval;
		1132	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1133	downheap ((WT *)periodics, periodiccnt, 0);
		1134	}
		1135	else
		1136	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
		1137
		1138	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
		1139	}
		1140	}
		1141
		1142	static void
		1143	periodics_reschedule (EV_P)
		1144	{
		1145	int i;
		1146
		1147	/* adjust periodics after time jump */
		1148	for (i = 0; i < periodiccnt; ++i)
		1149	{
		1150	ev_periodic *w = periodics [i];
		1151
		1152	if (w->reschedule_cb)
		1153	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1154	else if (w->interval)
		1155	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1156	}
		1157
		1158	/* now rebuild the heap */
		1159	for (i = periodiccnt >> 1; i--; )
		1160	downheap ((WT *)periodics, periodiccnt, i);
		1161	}
		1162	#endif
		1163
		1164	inline int
		1165	time_update_monotonic (EV_P)
		1166	{
		1167	mn_now = get_clock ();
		1168
		1169	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1170	{
		1171	ev_rt_now = rtmn_diff + mn_now;
		1172	return 0;
		1173	}
		1174	else
		1175	{
		1176	now_floor = mn_now;
		1177	ev_rt_now = ev_time ();
		1178	return 1;
		1179	}
		1180	}
		1181
		1182	inline void
		1183	time_update (EV_P)
		1184	{
		1185	int i;
		1186
		1187	#if EV_USE_MONOTONIC
		1188	if (expect_true (have_monotonic))
		1189	{
		1190	if (time_update_monotonic (EV_A))
		1191	{
		1192	ev_tstamp odiff = rtmn_diff;
		1193
		1194	for (i = 4; --i; ) /* loop a few times, before making important decisions */
		1195	{
		1196	rtmn_diff = ev_rt_now - mn_now;
		1197
		1198	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
		1199	return; /* all is well */
		1200
		1201	ev_rt_now = ev_time ();
		1202	mn_now = get_clock ();
		1203	now_floor = mn_now;
		1204	}
		1205
		1206	# if EV_PERIODICS
		1207	periodics_reschedule (EV_A);
		1208	# endif
		1209	/* no timer adjustment, as the monotonic clock doesn't jump */
		1210	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1211	}
		1212	}
		1213	else
		1214	#endif
		1215	{
		1216	ev_rt_now = ev_time ();
		1217
		1218	if (expect_false (mn_now > ev_rt_now || mn_now < ev_rt_now - MAX_BLOCKTIME - MIN_TIMEJUMP))
		1219	{
		1220	#if EV_PERIODICS
		1221	periodics_reschedule (EV_A);
		1222	#endif
		1223
		1224	/* adjust timers. this is easy, as the offset is the same for all */
		1225	for (i = 0; i < timercnt; ++i)
		1226	((WT)timers [i])->at += ev_rt_now - mn_now;
		1227	}
		1228
		1229	mn_now = ev_rt_now;
		1230	}
		1231	}
		1232
		1233	void
		1234	ev_ref (EV_P)
		1235	{
		1236	++activecnt;
		1237	}
		1238
		1239	void
		1240	ev_unref (EV_P)
		1241	{
		1242	--activecnt;
		1243	}
		1244
		1245	static int loop_done;
		1246
		1247	void
		1248	ev_loop (EV_P_ int flags)
		1249	{
		1250	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1251	? EVUNLOOP_ONE
		1252	: EVUNLOOP_CANCEL;
		1253
		1254	while (activecnt)
		1255	{
		1256	/* queue check watchers (and execute them) */
		1257	if (expect_false (preparecnt))
		1258	{
		1259	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1260	call_pending (EV_A);
		1261	}
		1262
		1263	/* we might have forked, so reify kernel state if necessary */
		1264	if (expect_false (postfork))
		1265	loop_fork (EV_A);
		1266
287	/* update fd-related kernel structures */	1267	/* update fd-related kernel structures */
288	method_reify (); fdchangecnt = 0;	1268	fd_reify (EV_A);
289		1269
290	/* calculate blocking time */	1270	/* calculate blocking time */
291	ev_now = ev_time ();	1271	{
		1272	double block;
292		1273
293	if (flags & EVLOOP_NONBLOCK)	1274	if (flags & EVLOOP_NONBLOCK || idlecnt)
294	block = 0.;	1275	block = 0.; /* do not block at all */
295	else if (!timercnt)	1276	else
		1277	{
		1278	/* update time to cancel out callback processing overhead */
		1279	#if EV_USE_MONOTONIC
		1280	if (expect_true (have_monotonic))
		1281	time_update_monotonic (EV_A);
		1282	else
		1283	#endif
		1284	{
		1285	ev_rt_now = ev_time ();
		1286	mn_now = ev_rt_now;
		1287	}
		1288
296	block = MAX_BLOCKTIME;	1289	block = MAX_BLOCKTIME;
297	else	1290
		1291	if (timercnt)
298	{	1292	{
299	block = timers [0]->at - ev_now + method_fudge;	1293	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
		1294	if (block > to) block = to;
		1295	}
		1296
		1297	#if EV_PERIODICS
		1298	if (periodiccnt)
		1299	{
		1300	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
		1301	if (block > to) block = to;
		1302	}
		1303	#endif
		1304
300	if (block < 0.) block = 0.;	1305	if (expect_false (block < 0.)) block = 0.;
301	else if (block > MAX_BLOCKTIME) block = MAX_BLOCKTIME;
302	}	1306	}
303		1307
304	method_poll (block);	1308	backend_poll (EV_A_ block);
		1309	}
305		1310
		1311	/* update ev_rt_now, do magic */
		1312	time_update (EV_A);
		1313
306	/* put pending timers into pendign queue and reschedule them */	1314	/* queue pending timers and reschedule them */
307	timer_reify ();	1315	timers_reify (EV_A); /* relative timers called last */
		1316	#if EV_PERIODICS
		1317	periodics_reify (EV_A); /* absolute timers called first */
		1318	#endif
308		1319
309	ev_now = ev_time ();	1320	/* queue idle watchers unless other events are pending */
		1321	if (idlecnt && !any_pending (EV_A))
		1322	queue_events (EV_A_ (W *)idles, idlecnt, EV_IDLE);
		1323
		1324	/* queue check watchers, to be executed first */
		1325	if (expect_false (checkcnt))
		1326	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1327
310	call_pending ();	1328	call_pending (EV_A);
311	}
312	while (!ev_loop_done);
313	}
314		1329
315	static void	1330	if (expect_false (loop_done))
316	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1331	break;
		1332	}
		1333
		1334	if (loop_done == EVUNLOOP_ONE)
		1335	loop_done = EVUNLOOP_CANCEL;
		1336	}
		1337
		1338	void
		1339	ev_unloop (EV_P_ int how)
		1340	{
		1341	loop_done = how;
		1342	}
		1343
		1344	/*****************************************************************************/
		1345
		1346	inline void
		1347	wlist_add (WL *head, WL elem)
317	{	1348	{
318	elem->next = *head;	1349	elem->next = *head;
319	*head = elem;	1350	*head = elem;
320	}	1351	}
321		1352
322	static void	1353	inline void
323	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1354	wlist_del (WL *head, WL elem)
324	{	1355	{
325	while (*head)	1356	while (*head)
326	{	1357	{
327	if (*head == elem)	1358	if (*head == elem)
328	{	1359	{
…		…
332		1363
333	head = &(*head)->next;	1364	head = &(*head)->next;
334	}	1365	}
335	}	1366	}
336		1367
337	static void	1368	inline void
338	ev_start (struct ev_watcher *w, int active)	1369	ev_clear_pending (EV_P_ W w)
339	{	1370	{
		1371	if (w->pending)
		1372	{
		1373	pendings [ABSPRI (w)][w->pending - 1].w = 0;
340	w->pending = 0;	1374	w->pending = 0;
		1375	}
		1376	}
		1377
		1378	inline void
		1379	ev_start (EV_P_ W w, int active)
		1380	{
		1381	if (w->priority < EV_MINPRI) w->priority = EV_MINPRI;
		1382	if (w->priority > EV_MAXPRI) w->priority = EV_MAXPRI;
		1383
341	w->active = active;	1384	w->active = active;
		1385	ev_ref (EV_A);
342	}	1386	}
343		1387
344	static void	1388	inline void
345	ev_stop (struct ev_watcher *w)	1389	ev_stop (EV_P_ W w)
346	{	1390	{
347	if (w->pending)	1391	ev_unref (EV_A);
348	pendings [w->pending - 1].w = 0;
349
350	w->active = 0;	1392	w->active = 0;
351	/* nop */
352	}	1393	}
353		1394
		1395	/*****************************************************************************/
		1396
354	void	1397	void
355	evio_start (struct ev_io *w)	1398	ev_io_start (EV_P_ ev_io *w)
		1399	{
		1400	int fd = w->fd;
		1401
		1402	if (expect_false (ev_is_active (w)))
		1403	return;
		1404
		1405	assert (("ev_io_start called with negative fd", fd >= 0));
		1406
		1407	ev_start (EV_A_ (W)w, 1);
		1408	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1409	wlist_add ((WL *)&anfds[fd].head, (WL)w);
		1410
		1411	fd_change (EV_A_ fd);
		1412	}
		1413
		1414	void
		1415	ev_io_stop (EV_P_ ev_io *w)
		1416	{
		1417	ev_clear_pending (EV_A_ (W)w);
		1418	if (expect_false (!ev_is_active (w)))
		1419	return;
		1420
		1421	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1422
		1423	wlist_del ((WL *)&anfds[w->fd].head, (WL)w);
		1424	ev_stop (EV_A_ (W)w);
		1425
		1426	fd_change (EV_A_ w->fd);
		1427	}
		1428
		1429	void
		1430	ev_timer_start (EV_P_ ev_timer *w)
		1431	{
		1432	if (expect_false (ev_is_active (w)))
		1433	return;
		1434
		1435	((WT)w)->at += mn_now;
		1436
		1437	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1438
		1439	ev_start (EV_A_ (W)w, ++timercnt);
		1440	array_needsize (ev_timer *, timers, timermax, timercnt, EMPTY2);
		1441	timers [timercnt - 1] = w;
		1442	upheap ((WT *)timers, timercnt - 1);
		1443
		1444	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1445	}
		1446
		1447	void
		1448	ev_timer_stop (EV_P_ ev_timer *w)
		1449	{
		1450	ev_clear_pending (EV_A_ (W)w);
		1451	if (expect_false (!ev_is_active (w)))
		1452	return;
		1453
		1454	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));
		1455
		1456	if (expect_true (((W)w)->active < timercnt--))
		1457	{
		1458	timers [((W)w)->active - 1] = timers [timercnt];
		1459	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1460	}
		1461
		1462	((WT)w)->at -= mn_now;
		1463
		1464	ev_stop (EV_A_ (W)w);
		1465	}
		1466
		1467	void
		1468	ev_timer_again (EV_P_ ev_timer *w)
356	{	1469	{
357	if (ev_is_active (w))	1470	if (ev_is_active (w))
358	return;
359
360	int fd = w->fd;
361
362	ev_start ((struct ev_watcher *)w, 1);
363	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
364	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
365
366	++fdchangecnt;
367	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
368	fdchanges [fdchangecnt - 1] = fd;
369	}
370
371	void
372	evio_stop (struct ev_io *w)
373	{
374	if (!ev_is_active (w))
375	return;
376
377	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
378	ev_stop ((struct ev_watcher *)w);
379
380	++fdchangecnt;
381	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
382	fdchanges [fdchangecnt - 1] = w->fd;
383	}
384
385	void
386	evtimer_start (struct ev_timer *w)
387	{
388	if (ev_is_active (w))
389	return;
390
391	if (w->is_abs)
392	{	1471	{
393	/* this formula differs from the one in timer_reify becuse we do not round up */
394	if (w->repeat)	1472	if (w->repeat)
395	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1473	{
		1474	((WT)w)->at = mn_now + w->repeat;
		1475	adjustheap ((WT *)timers, timercnt, ((W)w)->active - 1);
		1476	}
		1477	else
		1478	ev_timer_stop (EV_A_ w);
		1479	}
		1480	else if (w->repeat)
396	}	1481	{
		1482	w->at = w->repeat;
		1483	ev_timer_start (EV_A_ w);
		1484	}
		1485	}
		1486
		1487	#if EV_PERIODICS
		1488	void
		1489	ev_periodic_start (EV_P_ ev_periodic *w)
		1490	{
		1491	if (expect_false (ev_is_active (w)))
		1492	return;
		1493
		1494	if (w->reschedule_cb)
		1495	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1496	else if (w->interval)
		1497	{
		1498	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1499	/* this formula differs from the one in periodic_reify because we do not always round up */
		1500	((WT)w)->at += ceil ((ev_rt_now - ((WT)w)->at) / w->interval) * w->interval;
		1501	}
		1502
		1503	ev_start (EV_A_ (W)w, ++periodiccnt);
		1504	array_needsize (ev_periodic *, periodics, periodicmax, periodiccnt, EMPTY2);
		1505	periodics [periodiccnt - 1] = w;
		1506	upheap ((WT *)periodics, periodiccnt - 1);
		1507
		1508	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1509	}
		1510
		1511	void
		1512	ev_periodic_stop (EV_P_ ev_periodic *w)
		1513	{
		1514	ev_clear_pending (EV_A_ (W)w);
		1515	if (expect_false (!ev_is_active (w)))
		1516	return;
		1517
		1518	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));
		1519
		1520	if (expect_true (((W)w)->active < periodiccnt--))
		1521	{
		1522	periodics [((W)w)->active - 1] = periodics [periodiccnt];
		1523	adjustheap ((WT *)periodics, periodiccnt, ((W)w)->active - 1);
		1524	}
		1525
		1526	ev_stop (EV_A_ (W)w);
		1527	}
		1528
		1529	void
		1530	ev_periodic_again (EV_P_ ev_periodic *w)
		1531	{
		1532	/* TODO: use adjustheap and recalculation */
		1533	ev_periodic_stop (EV_A_ w);
		1534	ev_periodic_start (EV_A_ w);
		1535	}
		1536	#endif
		1537
		1538	void
		1539	ev_idle_start (EV_P_ ev_idle *w)
		1540	{
		1541	if (expect_false (ev_is_active (w)))
		1542	return;
		1543
		1544	ev_start (EV_A_ (W)w, ++idlecnt);
		1545	array_needsize (ev_idle *, idles, idlemax, idlecnt, EMPTY2);
		1546	idles [idlecnt - 1] = w;
		1547	}
		1548
		1549	void
		1550	ev_idle_stop (EV_P_ ev_idle *w)
		1551	{
		1552	ev_clear_pending (EV_A_ (W)w);
		1553	if (expect_false (!ev_is_active (w)))
		1554	return;
		1555
		1556	idles [((W)w)->active - 1] = idles [--idlecnt];
		1557	ev_stop (EV_A_ (W)w);
		1558	}
		1559
		1560	void
		1561	ev_prepare_start (EV_P_ ev_prepare *w)
		1562	{
		1563	if (expect_false (ev_is_active (w)))
		1564	return;
		1565
		1566	ev_start (EV_A_ (W)w, ++preparecnt);
		1567	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		1568	prepares [preparecnt - 1] = w;
		1569	}
		1570
		1571	void
		1572	ev_prepare_stop (EV_P_ ev_prepare *w)
		1573	{
		1574	ev_clear_pending (EV_A_ (W)w);
		1575	if (expect_false (!ev_is_active (w)))
		1576	return;
		1577
		1578	prepares [((W)w)->active - 1] = prepares [--preparecnt];
		1579	ev_stop (EV_A_ (W)w);
		1580	}
		1581
		1582	void
		1583	ev_check_start (EV_P_ ev_check *w)
		1584	{
		1585	if (expect_false (ev_is_active (w)))
		1586	return;
		1587
		1588	ev_start (EV_A_ (W)w, ++checkcnt);
		1589	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		1590	checks [checkcnt - 1] = w;
		1591	}
		1592
		1593	void
		1594	ev_check_stop (EV_P_ ev_check *w)
		1595	{
		1596	ev_clear_pending (EV_A_ (W)w);
		1597	if (expect_false (!ev_is_active (w)))
		1598	return;
		1599
		1600	checks [((W)w)->active - 1] = checks [--checkcnt];
		1601	ev_stop (EV_A_ (W)w);
		1602	}
		1603
		1604	#ifndef SA_RESTART
		1605	# define SA_RESTART 0
		1606	#endif
		1607
		1608	void
		1609	ev_signal_start (EV_P_ ev_signal *w)
		1610	{
		1611	#if EV_MULTIPLICITY
		1612	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1613	#endif
		1614	if (expect_false (ev_is_active (w)))
		1615	return;
		1616
		1617	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1618
		1619	ev_start (EV_A_ (W)w, 1);
		1620	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
		1621	wlist_add ((WL *)&signals [w->signum - 1].head, (WL)w);
		1622
		1623	if (!((WL)w)->next)
		1624	{
		1625	#if _WIN32
		1626	signal (w->signum, sighandler);
		1627	#else
		1628	struct sigaction sa;
		1629	sa.sa_handler = sighandler;
		1630	sigfillset (&sa.sa_mask);
		1631	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
		1632	sigaction (w->signum, &sa, 0);
		1633	#endif
		1634	}
		1635	}
		1636
		1637	void
		1638	ev_signal_stop (EV_P_ ev_signal *w)
		1639	{
		1640	ev_clear_pending (EV_A_ (W)w);
		1641	if (expect_false (!ev_is_active (w)))
		1642	return;
		1643
		1644	wlist_del ((WL *)&signals [w->signum - 1].head, (WL)w);
		1645	ev_stop (EV_A_ (W)w);
		1646
		1647	if (!signals [w->signum - 1].head)
		1648	signal (w->signum, SIG_DFL);
		1649	}
		1650
		1651	void
		1652	ev_child_start (EV_P_ ev_child *w)
		1653	{
		1654	#if EV_MULTIPLICITY
		1655	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1656	#endif
		1657	if (expect_false (ev_is_active (w)))
		1658	return;
		1659
		1660	ev_start (EV_A_ (W)w, 1);
		1661	wlist_add ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1662	}
		1663
		1664	void
		1665	ev_child_stop (EV_P_ ev_child *w)
		1666	{
		1667	ev_clear_pending (EV_A_ (W)w);
		1668	if (expect_false (!ev_is_active (w)))
		1669	return;
		1670
		1671	wlist_del ((WL *)&childs [w->pid & (PID_HASHSIZE - 1)], (WL)w);
		1672	ev_stop (EV_A_ (W)w);
		1673	}
		1674
		1675	#if EV_MULTIPLICITY
		1676	void
		1677	ev_embed_loop (EV_P_ ev_embed *w)
		1678	{
		1679	ev_loop (w->loop, EVLOOP_NONBLOCK);
		1680	}
		1681
		1682	static void
		1683	embed_cb (EV_P_ ev_io *io, int revents)
		1684	{
		1685	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
		1686
		1687	if (ev_cb (w))
		1688	ev_feed_event (EV_A_ (W)w, EV_EMBED);
397	else	1689	else
398	w->at += ev_now;	1690	ev_embed_loop (loop, w);
399
400	ev_start ((struct ev_watcher *)w, ++timercnt);
401	array_needsize (timers, timermax, timercnt, );
402	timers [timercnt - 1] = w;
403	upheap (timercnt - 1);
404	}	1691	}
405		1692
406	void	1693	void
407	evtimer_stop (struct ev_timer *w)	1694	ev_embed_start (EV_P_ ev_embed *w)
408	{	1695	{
		1696	if (expect_false (ev_is_active (w)))
		1697	return;
		1698
		1699	{
		1700	struct ev_loop *loop = w->loop;
		1701	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
		1702	ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
		1703	}
		1704
		1705	ev_set_priority (&w->io, ev_priority (w));
		1706	ev_io_start (EV_A_ &w->io);
		1707	ev_start (EV_A_ (W)w, 1);
		1708	}
		1709
		1710	void
		1711	ev_embed_stop (EV_P_ ev_embed *w)
		1712	{
		1713	ev_clear_pending (EV_A_ (W)w);
409	if (!ev_is_active (w))	1714	if (expect_false (!ev_is_active (w)))
410	return;	1715	return;
411		1716
412	if (w->active < timercnt--)	1717	ev_io_stop (EV_A_ &w->io);
413	{	1718	ev_stop (EV_A_ (W)w);
414	timers [w->active - 1] = timers [timercnt];
415	downheap (w->active - 1);
416	}
417
418	ev_stop ((struct ev_watcher *)w);
419	}	1719	}
420		1720	#endif
421	void
422	evsignal_start (struct ev_signal *w)
423	{
424	if (ev_is_active (w))
425	return;
426
427	ev_start ((struct ev_watcher *)w, 1);
428	array_needsize (signals, signalmax, w->signum, signals_init);
429	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
430	}
431
432	void
433	evsignal_stop (struct ev_signal *w)
434	{
435	if (!ev_is_active (w))
436	return;
437
438	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1], (struct ev_watcher_list *)w);
439	ev_stop ((struct ev_watcher *)w);
440	}
441		1721
442	/*****************************************************************************/	1722	/*****************************************************************************/
443	#if 1
444		1723
		1724	struct ev_once
		1725	{
		1726	ev_io io;
		1727	ev_timer to;
		1728	void (*cb)(int revents, void *arg);
		1729	void *arg;
		1730	};
		1731
445	static void	1732	static void
446	sin_cb (struct ev_io *w, int revents)	1733	once_cb (EV_P_ struct ev_once *once, int revents)
447	{	1734	{
448	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	1735	void (*cb)(int revents, void *arg) = once->cb;
449	}	1736	void *arg = once->arg;
450		1737
		1738	ev_io_stop (EV_A_ &once->io);
		1739	ev_timer_stop (EV_A_ &once->to);
		1740	ev_free (once);
		1741
		1742	cb (revents, arg);
		1743	}
		1744
451	static void	1745	static void
		1746	once_cb_io (EV_P_ ev_io *w, int revents)
		1747	{
		1748	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
		1749	}
		1750
		1751	static void
452	ocb (struct ev_timer *w, int revents)	1752	once_cb_to (EV_P_ ev_timer *w, int revents)
453	{	1753	{
454	fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	1754	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
455	}	1755	}
456		1756
457	int main (void)	1757	void
		1758	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
458	{	1759	{
459	struct ev_io sin;	1760	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
460		1761
461	ev_init (0);	1762	if (expect_false (!once))
462
463	evw_init (&sin, sin_cb, 55);
464	evio_set (&sin, 0, EV_READ);
465	evio_start (&sin);
466
467	struct ev_timer t[1000];
468
469	int i;
470	for (i = 0; i < 1000; ++i)
471	{
472	struct ev_timer *w = t + i;
473	evw_init (w, ocb, i);
474	evtimer_set_rel (w, drand48 (), 0);
475	evtimer_start (w);
476	if (drand48 () < 0.5)
477	evtimer_stop (w);
478	}	1763	{
479		1764	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
480	ev_loop (0);
481
482	return 0;	1765	return;
483	}	1766	}
484		1767
485	#endif	1768	once->cb = cb;
		1769	once->arg = arg;
486		1770
		1771	ev_init (&once->io, once_cb_io);
		1772	if (fd >= 0)
		1773	{
		1774	ev_io_set (&once->io, fd, events);
		1775	ev_io_start (EV_A_ &once->io);
		1776	}
487		1777
		1778	ev_init (&once->to, once_cb_to);
		1779	if (timeout >= 0.)
		1780	{
		1781	ev_timer_set (&once->to, timeout, 0.);
		1782	ev_timer_start (EV_A_ &once->to);
		1783	}
		1784	}
488		1785
		1786	#ifdef __cplusplus
		1787	}
		1788	#endif
489		1789

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