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Comparing libev/ev.c (file contents):
Revision 1.7 by root, Wed Oct 31 00:24:16 2007 UTC vs.
Revision 1.183 by root, Wed Dec 12 05:11:56 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	# ifndef EV_USE_INOTIFY
		100	# if HAVE_INOTIFY_INIT && HAVE_SYS_INOTIFY_H
		101	# define EV_USE_INOTIFY 1
		102	# else
		103	# define EV_USE_INOTIFY 0
		104	# endif
		105	# endif
		106
		107	#endif
		108
1	#include <math.h>	109	#include <math.h>
2	#include <stdlib.h>	110	#include <stdlib.h>
3	#include <unistd.h>
4	#include <fcntl.h>	111	#include <fcntl.h>
5	#include <signal.h>	112	#include <stddef.h>
6		113
7	#include <stdio.h>	114	#include <stdio.h>
8		115
9	#include <assert.h>	116	#include <assert.h>
10	#include <errno.h>	117	#include <errno.h>
11	#include <sys/time.h>	118	#include <sys/types.h>
12	#include <time.h>	119	#include <time.h>
13		120
		121	#include <signal.h>
		122
		123	#ifdef EV_H
		124	# include EV_H
		125	#else
		126	# include "ev.h"
		127	#endif
		128
		129	#ifndef _WIN32
		130	# include <sys/time.h>
		131	# include <sys/wait.h>
		132	# include <unistd.h>
		133	#else
		134	# define WIN32_LEAN_AND_MEAN
		135	# include <windows.h>
		136	# ifndef EV_SELECT_IS_WINSOCKET
		137	# define EV_SELECT_IS_WINSOCKET 1
		138	# endif
		139	#endif
		140
		141	/**/
		142
		143	#ifndef EV_USE_MONOTONIC
		144	# define EV_USE_MONOTONIC 0
		145	#endif
		146
		147	#ifndef EV_USE_REALTIME
		148	# define EV_USE_REALTIME 0
		149	#endif
		150
		151	#ifndef EV_USE_SELECT
		152	# define EV_USE_SELECT 1
		153	#endif
		154
		155	#ifndef EV_USE_POLL
		156	# ifdef _WIN32
		157	# define EV_USE_POLL 0
		158	# else
		159	# define EV_USE_POLL 1
		160	# endif
		161	#endif
		162
		163	#ifndef EV_USE_EPOLL
		164	# define EV_USE_EPOLL 0
		165	#endif
		166
		167	#ifndef EV_USE_KQUEUE
		168	# define EV_USE_KQUEUE 0
		169	#endif
		170
		171	#ifndef EV_USE_PORT
		172	# define EV_USE_PORT 0
		173	#endif
		174
		175	#ifndef EV_USE_INOTIFY
		176	# define EV_USE_INOTIFY 0
		177	#endif
		178
		179	#ifndef EV_PID_HASHSIZE
		180	# if EV_MINIMAL
		181	# define EV_PID_HASHSIZE 1
		182	# else
		183	# define EV_PID_HASHSIZE 16
		184	# endif
		185	#endif
		186
		187	#ifndef EV_INOTIFY_HASHSIZE
		188	# if EV_MINIMAL
		189	# define EV_INOTIFY_HASHSIZE 1
		190	# else
		191	# define EV_INOTIFY_HASHSIZE 16
		192	# endif
		193	#endif
		194
		195	/**/
		196
14	#ifdef CLOCK_MONOTONIC	197	#ifndef CLOCK_MONOTONIC
		198	# undef EV_USE_MONOTONIC
15	# define HAVE_MONOTONIC 1	199	# define EV_USE_MONOTONIC 0
16	#endif	200	#endif
17		201
		202	#ifndef CLOCK_REALTIME
		203	# undef EV_USE_REALTIME
18	#define HAVE_REALTIME 1	204	# define EV_USE_REALTIME 0
19	#define HAVE_EPOLL 1	205	#endif
20	#define HAVE_SELECT 1	206
		207	#if EV_SELECT_IS_WINSOCKET
		208	# include <winsock.h>
		209	#endif
		210
		211	#if !EV_STAT_ENABLE
		212	# define EV_USE_INOTIFY 0
		213	#endif
		214
		215	#if EV_USE_INOTIFY
		216	# include <sys/inotify.h>
		217	#endif
		218
		219	/**/
		220
		221	/*
		222	* This is used to avoid floating point rounding problems.
		223	* It is added to ev_rt_now when scheduling periodics
		224	* to ensure progress, time-wise, even when rounding
		225	* errors are against us.
		226	* This value is good at least till the year 4000.
		227	* Better solutions welcome.
		228	*/
		229	#define TIME_EPSILON 0.0001220703125 /* 1/8192 */
21		230
22	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */	231	#define MIN_TIMEJUMP 1. /* minimum timejump that gets detected (if monotonic clock available) */
23	#define MAX_BLOCKTIME 60.	232	#define MAX_BLOCKTIME 59.743 /* never wait longer than this time (to detect time jumps) */
		233	/*#define CLEANUP_INTERVAL (MAX_BLOCKTIME * 5.) /* how often to try to free memory and re-check fds, TODO */
24		234
		235	#if __GNUC__ >= 3
		236	# define expect(expr,value) __builtin_expect ((expr),(value))
		237	# define noinline __attribute__ ((noinline))
		238	#else
		239	# define expect(expr,value) (expr)
		240	# define noinline
		241	# if __STDC_VERSION__ < 199901L
		242	# define inline
		243	# endif
		244	#endif
		245
		246	#define expect_false(expr) expect ((expr) != 0, 0)
		247	#define expect_true(expr) expect ((expr) != 0, 1)
		248	#define inline_size static inline
		249
		250	#if EV_MINIMAL
		251	# define inline_speed static noinline
		252	#else
		253	# define inline_speed static inline
		254	#endif
		255
		256	#define NUMPRI (EV_MAXPRI - EV_MINPRI + 1)
		257	#define ABSPRI(w) (((W)w)->priority - EV_MINPRI)
		258
		259	#define EMPTY /* required for microsofts broken pseudo-c compiler */
		260	#define EMPTY2(a,b) /* used to suppress some warnings */
		261
		262	typedef ev_watcher *W;
		263	typedef ev_watcher_list *WL;
		264	typedef ev_watcher_time *WT;
		265
		266	static int have_monotonic; /* did clock_gettime (CLOCK_MONOTONIC) work? */
		267
		268	#ifdef _WIN32
		269	# include "ev_win32.c"
		270	#endif
		271
		272	/*****************************************************************************/
		273
		274	static void (*syserr_cb)(const char *msg);
		275
		276	void
		277	ev_set_syserr_cb (void (*cb)(const char *msg))
		278	{
		279	syserr_cb = cb;
		280	}
		281
		282	static void noinline
		283	syserr (const char *msg)
		284	{
		285	if (!msg)
		286	msg = "(libev) system error";
		287
		288	if (syserr_cb)
		289	syserr_cb (msg);
		290	else
		291	{
		292	perror (msg);
		293	abort ();
		294	}
		295	}
		296
		297	static void *(*alloc)(void *ptr, long size);
		298
		299	void
		300	ev_set_allocator (void *(*cb)(void *ptr, long size))
		301	{
		302	alloc = cb;
		303	}
		304
		305	inline_speed void *
		306	ev_realloc (void *ptr, long size)
		307	{
		308	ptr = alloc ? alloc (ptr, size) : realloc (ptr, size);
		309
		310	if (!ptr && size)
		311	{
		312	fprintf (stderr, "libev: cannot allocate %ld bytes, aborting.", size);
		313	abort ();
		314	}
		315
		316	return ptr;
		317	}
		318
		319	#define ev_malloc(size) ev_realloc (0, (size))
		320	#define ev_free(ptr) ev_realloc ((ptr), 0)
		321
		322	/*****************************************************************************/
		323
		324	typedef struct
		325	{
		326	WL head;
		327	unsigned char events;
		328	unsigned char reify;
		329	#if EV_SELECT_IS_WINSOCKET
		330	SOCKET handle;
		331	#endif
		332	} ANFD;
		333
		334	typedef struct
		335	{
		336	W w;
		337	int events;
		338	} ANPENDING;
		339
		340	#if EV_USE_INOTIFY
		341	typedef struct
		342	{
		343	WL head;
		344	} ANFS;
		345	#endif
		346
		347	#if EV_MULTIPLICITY
		348
		349	struct ev_loop
		350	{
		351	ev_tstamp ev_rt_now;
		352	#define ev_rt_now ((loop)->ev_rt_now)
		353	#define VAR(name,decl) decl;
		354	#include "ev_vars.h"
		355	#undef VAR
		356	};
25	#include "ev.h"	357	#include "ev_wrap.h"
26		358
27	struct ev_watcher {	359	static struct ev_loop default_loop_struct;
28	EV_WATCHER (ev_watcher);	360	struct ev_loop *ev_default_loop_ptr;
29	};
30		361
31	struct ev_watcher_list {	362	#else
32	EV_WATCHER_LIST (ev_watcher_list);
33	};
34		363
35	static ev_tstamp now, diff; /* monotonic clock */
36	ev_tstamp ev_now;	364	ev_tstamp ev_rt_now;
37	int ev_method;	365	#define VAR(name,decl) static decl;
		366	#include "ev_vars.h"
		367	#undef VAR
38		368
39	static int have_monotonic; /* runtime */	369	static int ev_default_loop_ptr;
40		370
41	static ev_tstamp method_fudge; /* stupid epoll-returns-early bug */	371	#endif
42	static void (*method_modify)(int fd, int oev, int nev);	372
43	static void (*method_poll)(ev_tstamp timeout);	373	/*****************************************************************************/
44		374
45	ev_tstamp	375	ev_tstamp
46	ev_time (void)	376	ev_time (void)
47	{	377	{
48	#if HAVE_REALTIME	378	#if EV_USE_REALTIME
49	struct timespec ts;	379	struct timespec ts;
50	clock_gettime (CLOCK_REALTIME, &ts);	380	clock_gettime (CLOCK_REALTIME, &ts);
51	return ts.tv_sec + ts.tv_nsec * 1e-9;	381	return ts.tv_sec + ts.tv_nsec * 1e-9;
52	#else	382	#else
53	struct timeval tv;	383	struct timeval tv;
54	gettimeofday (&tv, 0);	384	gettimeofday (&tv, 0);
55	return tv.tv_sec + tv.tv_usec * 1e-6;	385	return tv.tv_sec + tv.tv_usec * 1e-6;
56	#endif	386	#endif
57	}	387	}
58		388
59	static ev_tstamp	389	ev_tstamp inline_size
60	get_clock (void)	390	get_clock (void)
61	{	391	{
62	#if HAVE_MONOTONIC	392	#if EV_USE_MONOTONIC
63	if (have_monotonic)	393	if (expect_true (have_monotonic))
64	{	394	{
65	struct timespec ts;	395	struct timespec ts;
66	clock_gettime (CLOCK_MONOTONIC, &ts);	396	clock_gettime (CLOCK_MONOTONIC, &ts);
67	return ts.tv_sec + ts.tv_nsec * 1e-9;	397	return ts.tv_sec + ts.tv_nsec * 1e-9;
68	}	398	}
69	#endif	399	#endif
70		400
71	return ev_time ();	401	return ev_time ();
72	}	402	}
73		403
		404	#if EV_MULTIPLICITY
		405	ev_tstamp
		406	ev_now (EV_P)
		407	{
		408	return ev_rt_now;
		409	}
		410	#endif
		411
		412	int inline_size
		413	array_nextsize (int elem, int cur, int cnt)
		414	{
		415	int ncur = cur + 1;
		416
		417	do
		418	ncur <<= 1;
		419	while (cnt > ncur);
		420
		421	/* if size > 4096, round to 4096 - 4 * longs to accomodate malloc overhead */
		422	if (elem * ncur > 4096)
		423	{
		424	ncur *= elem;
		425	ncur = (ncur + elem + 4095 + sizeof (void *) * 4) & ~4095;
		426	ncur = ncur - sizeof (void *) * 4;
		427	ncur /= elem;
		428	}
		429
		430	return ncur;
		431	}
		432
		433	static noinline void *
		434	array_realloc (int elem, void *base, int *cur, int cnt)
		435	{
		436	*cur = array_nextsize (elem, *cur, cnt);
		437	return ev_realloc (base, elem * *cur);
		438	}
		439
74	#define array_needsize(base,cur,cnt,init) \	440	#define array_needsize(type,base,cur,cnt,init) \
75	if ((cnt) > cur) \	441	if (expect_false ((cnt) > (cur))) \
76	{ \	442	{ \
77	int newcnt = cur ? cur << 1 : 16; \	443	int ocur_ = (cur); \
78	fprintf (stderr, "resize(" # base ") from %d to %d\n", cur, newcnt);\	444	(base) = (type *)array_realloc \
79	base = realloc (base, sizeof (*base) * (newcnt)); \	445	(sizeof (type), (base), &(cur), (cnt)); \
80	init (base + cur, newcnt - cur); \	446	init ((base) + (ocur_), (cur) - ocur_); \
81	cur = newcnt; \	447	}
		448
		449	#if 0
		450	#define array_slim(type,stem) \
		451	if (stem ## max < array_roundsize (stem ## cnt >> 2)) \
		452	{ \
		453	stem ## max = array_roundsize (stem ## cnt >> 1); \
		454	base = (type *)ev_realloc (base, sizeof (type) * (stem ## max));\
		455	fprintf (stderr, "slimmed down " # stem " to %d\n", stem ## max);/*D*/\
		456	}
		457	#endif
		458
		459	#define array_free(stem, idx) \
		460	ev_free (stem ## s idx); stem ## cnt idx = stem ## max idx = 0;
		461
		462	/*****************************************************************************/
		463
		464	void noinline
		465	ev_feed_event (EV_P_ void *w, int revents)
		466	{
		467	W w_ = (W)w;
		468	int pri = ABSPRI (w_);
		469
		470	if (expect_false (w_->pending))
		471	pendings [pri][w_->pending - 1].events |= revents;
		472	else
		473	{
		474	w_->pending = ++pendingcnt [pri];
		475	array_needsize (ANPENDING, pendings [pri], pendingmax [pri], w_->pending, EMPTY2);
		476	pendings [pri][w_->pending - 1].w = w_;
		477	pendings [pri][w_->pending - 1].events = revents;
		478	}
		479	}
		480
		481	void inline_speed
		482	queue_events (EV_P_ W *events, int eventcnt, int type)
		483	{
		484	int i;
		485
		486	for (i = 0; i < eventcnt; ++i)
		487	ev_feed_event (EV_A_ events [i], type);
		488	}
		489
		490	/*****************************************************************************/
		491
		492	void inline_size
		493	anfds_init (ANFD *base, int count)
		494	{
		495	while (count--)
		496	{
		497	base->head = 0;
		498	base->events = EV_NONE;
		499	base->reify = 0;
		500
		501	++base;
		502	}
		503	}
		504
		505	void inline_speed
		506	fd_event (EV_P_ int fd, int revents)
		507	{
		508	ANFD *anfd = anfds + fd;
		509	ev_io *w;
		510
		511	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		512	{
		513	int ev = w->events & revents;
		514
		515	if (ev)
		516	ev_feed_event (EV_A_ (W)w, ev);
		517	}
		518	}
		519
		520	void
		521	ev_feed_fd_event (EV_P_ int fd, int revents)
		522	{
		523	if (fd >= 0 && fd < anfdmax)
		524	fd_event (EV_A_ fd, revents);
		525	}
		526
		527	void inline_size
		528	fd_reify (EV_P)
		529	{
		530	int i;
		531
		532	for (i = 0; i < fdchangecnt; ++i)
		533	{
		534	int fd = fdchanges [i];
		535	ANFD *anfd = anfds + fd;
		536	ev_io *w;
		537
		538	int events = 0;
		539
		540	for (w = (ev_io *)anfd->head; w; w = (ev_io *)((WL)w)->next)
		541	events |= w->events;
		542
		543	#if EV_SELECT_IS_WINSOCKET
		544	if (events)
		545	{
		546	unsigned long argp;
		547	anfd->handle = _get_osfhandle (fd);
		548	assert (("libev only supports socket fds in this configuration", ioctlsocket (anfd->handle, FIONREAD, &argp) == 0));
		549	}
		550	#endif
		551
		552	anfd->reify = 0;
		553
		554	backend_modify (EV_A_ fd, anfd->events, events);
		555	anfd->events = events;
		556	}
		557
		558	fdchangecnt = 0;
		559	}
		560
		561	void inline_size
		562	fd_change (EV_P_ int fd, int flags)
		563	{
		564	unsigned char reify = anfds [fd].reify;
		565	anfds [fd].reify |= flags | 1;
		566
		567	if (expect_true (!reify))
		568	{
		569	++fdchangecnt;
		570	array_needsize (int, fdchanges, fdchangemax, fdchangecnt, EMPTY2);
		571	fdchanges [fdchangecnt - 1] = fd;
		572	}
		573	}
		574
		575	void inline_speed
		576	fd_kill (EV_P_ int fd)
		577	{
		578	ev_io *w;
		579
		580	while ((w = (ev_io *)anfds [fd].head))
		581	{
		582	ev_io_stop (EV_A_ w);
		583	ev_feed_event (EV_A_ (W)w, EV_ERROR | EV_READ | EV_WRITE);
		584	}
		585	}
		586
		587	int inline_size
		588	fd_valid (int fd)
		589	{
		590	#ifdef _WIN32
		591	return _get_osfhandle (fd) != -1;
		592	#else
		593	return fcntl (fd, F_GETFD) != -1;
		594	#endif
		595	}
		596
		597	/* called on EBADF to verify fds */
		598	static void noinline
		599	fd_ebadf (EV_P)
		600	{
		601	int fd;
		602
		603	for (fd = 0; fd < anfdmax; ++fd)
		604	if (anfds [fd].events)
		605	if (!fd_valid (fd) == -1 && errno == EBADF)
		606	fd_kill (EV_A_ fd);
		607	}
		608
		609	/* called on ENOMEM in select/poll to kill some fds and retry */
		610	static void noinline
		611	fd_enomem (EV_P)
		612	{
		613	int fd;
		614
		615	for (fd = anfdmax; fd--; )
		616	if (anfds [fd].events)
		617	{
		618	fd_kill (EV_A_ fd);
		619	return;
82	}	620	}
		621	}
		622
		623	/* usually called after fork if backend needs to re-arm all fds from scratch */
		624	static void noinline
		625	fd_rearm_all (EV_P)
		626	{
		627	int fd;
		628
		629	for (fd = 0; fd < anfdmax; ++fd)
		630	if (anfds [fd].events)
		631	{
		632	anfds [fd].events = 0;
		633	fd_change (EV_A_ fd, EV_IOFDSET);
		634	}
		635	}
		636
		637	/*****************************************************************************/
		638
		639	void inline_speed
		640	upheap (WT *heap, int k)
		641	{
		642	WT w = heap [k];
		643
		644	while (k)
		645	{
		646	int p = (k - 1) >> 1;
		647
		648	if (heap [p]->at <= w->at)
		649	break;
		650
		651	heap [k] = heap [p];
		652	((W)heap [k])->active = k + 1;
		653	k = p;
		654	}
		655
		656	heap [k] = w;
		657	((W)heap [k])->active = k + 1;
		658	}
		659
		660	void inline_speed
		661	downheap (WT *heap, int N, int k)
		662	{
		663	WT w = heap [k];
		664
		665	for (;;)
		666	{
		667	int c = (k << 1) + 1;
		668
		669	if (c >= N)
		670	break;
		671
		672	c += c + 1 < N && heap [c]->at > heap [c + 1]->at
		673	? 1 : 0;
		674
		675	if (w->at <= heap [c]->at)
		676	break;
		677
		678	heap [k] = heap [c];
		679	((W)heap [k])->active = k + 1;
		680
		681	k = c;
		682	}
		683
		684	heap [k] = w;
		685	((W)heap [k])->active = k + 1;
		686	}
		687
		688	void inline_size
		689	adjustheap (WT *heap, int N, int k)
		690	{
		691	upheap (heap, k);
		692	downheap (heap, N, k);
		693	}
		694
		695	/*****************************************************************************/
83		696
84	typedef struct	697	typedef struct
85	{	698	{
86	struct ev_io *head;	699	WL head;
87	unsigned char wev, rev; /* want, received event set */
88	} ANFD;
89
90	static ANFD *anfds;
91	static int anfdmax;
92
93	static int *fdchanges;
94	static int fdchangemax, fdchangecnt;
95
96	static void
97	anfds_init (ANFD *base, int count)
98	{
99	while (count--)
100	{
101	base->head = 0;
102	base->wev = base->rev = EV_NONE;
103	++base;
104	}
105	}
106
107	typedef struct
108	{
109	struct ev_watcher *w;
110	int events;
111	} ANPENDING;
112
113	static ANPENDING *pendings;
114	static int pendingmax, pendingcnt;
115
116	static void
117	event (struct ev_watcher *w, int events)
118	{
119	w->pending = ++pendingcnt;
120	array_needsize (pendings, pendingmax, pendingcnt, );
121	pendings [pendingcnt - 1].w = w;
122	pendings [pendingcnt - 1].events = events;
123	}
124
125	static void
126	fd_event (int fd, int events)
127	{
128	ANFD *anfd = anfds + fd;
129	struct ev_io *w;
130
131	for (w = anfd->head; w; w = w->next)
132	{
133	int ev = w->events & events;
134
135	if (ev)
136	event ((struct ev_watcher *)w, ev);
137	}
138	}
139
140	static struct ev_timer **atimers;
141	static int atimermax, atimercnt;
142
143	static struct ev_timer **rtimers;
144	static int rtimermax, rtimercnt;
145
146	static void
147	upheap (struct ev_timer **timers, int k)
148	{
149	struct ev_timer *w = timers [k];
150
151	while (k && timers [k >> 1]->at > w->at)
152	{
153	timers [k] = timers [k >> 1];
154	timers [k]->active = k + 1;
155	k >>= 1;
156	}
157
158	timers [k] = w;
159	timers [k]->active = k + 1;
160
161	}
162
163	static void
164	downheap (struct ev_timer **timers, int N, int k)
165	{
166	struct ev_timer *w = timers [k];
167
168	while (k < (N >> 1))
169	{
170	int j = k << 1;
171
172	if (j + 1 < N && timers [j]->at > timers [j + 1]->at)
173	++j;
174
175	if (w->at <= timers [j]->at)
176	break;
177
178	timers [k] = timers [j];
179	timers [k]->active = k + 1;
180	k = j;
181	}
182
183	timers [k] = w;
184	timers [k]->active = k + 1;
185	}
186
187	typedef struct
188	{
189	struct ev_signal *head;
190	sig_atomic_t gotsig;	700	sig_atomic_t volatile gotsig;
191	} ANSIG;	701	} ANSIG;
192		702
193	static ANSIG *signals;	703	static ANSIG *signals;
194	static int signalmax;	704	static int signalmax;
195		705
196	static int sigpipe [2];	706	static int sigpipe [2];
197	static sig_atomic_t gotsig;	707	static sig_atomic_t volatile gotsig;
198	static struct ev_io sigev;	708	static ev_io sigev;
199		709
200	static void	710	void inline_size
201	signals_init (ANSIG *base, int count)	711	signals_init (ANSIG *base, int count)
202	{	712	{
203	while (count--)	713	while (count--)
204	{	714	{
205	base->head = 0;	715	base->head = 0;
206	base->gotsig = 0;	716	base->gotsig = 0;
		717
207	++base;	718	++base;
208	}	719	}
209	}	720	}
210		721
211	static void	722	static void
212	sighandler (int signum)	723	sighandler (int signum)
213	{	724	{
		725	#if _WIN32
		726	signal (signum, sighandler);
		727	#endif
		728
214	signals [signum - 1].gotsig = 1;	729	signals [signum - 1].gotsig = 1;
215		730
216	if (!gotsig)	731	if (!gotsig)
217	{	732	{
		733	int old_errno = errno;
218	gotsig = 1;	734	gotsig = 1;
219	write (sigpipe [1], &gotsig, 1);	735	write (sigpipe [1], &signum, 1);
		736	errno = old_errno;
220	}	737	}
		738	}
		739
		740	void noinline
		741	ev_feed_signal_event (EV_P_ int signum)
		742	{
		743	WL w;
		744
		745	#if EV_MULTIPLICITY
		746	assert (("feeding signal events is only supported in the default loop", loop == ev_default_loop_ptr));
		747	#endif
		748
		749	--signum;
		750
		751	if (signum < 0 || signum >= signalmax)
		752	return;
		753
		754	signals [signum].gotsig = 0;
		755
		756	for (w = signals [signum].head; w; w = w->next)
		757	ev_feed_event (EV_A_ (W)w, EV_SIGNAL);
221	}	758	}
222		759
223	static void	760	static void
224	sigcb (struct ev_io *iow, int revents)	761	sigcb (EV_P_ ev_io *iow, int revents)
225	{	762	{
226	struct ev_signal *w;
227	int sig;	763	int signum;
228		764
		765	read (sigpipe [0], &revents, 1);
229	gotsig = 0;	766	gotsig = 0;
230	read (sigpipe [0], &revents, 1);
231		767
232	for (sig = signalmax; sig--; )	768	for (signum = signalmax; signum--; )
233	if (signals [sig].gotsig)	769	if (signals [signum].gotsig)
		770	ev_feed_signal_event (EV_A_ signum + 1);
		771	}
		772
		773	void inline_speed
		774	fd_intern (int fd)
		775	{
		776	#ifdef _WIN32
		777	int arg = 1;
		778	ioctlsocket (_get_osfhandle (fd), FIONBIO, &arg);
		779	#else
		780	fcntl (fd, F_SETFD, FD_CLOEXEC);
		781	fcntl (fd, F_SETFL, O_NONBLOCK);
		782	#endif
		783	}
		784
		785	static void noinline
		786	siginit (EV_P)
		787	{
		788	fd_intern (sigpipe [0]);
		789	fd_intern (sigpipe [1]);
		790
		791	ev_io_set (&sigev, sigpipe [0], EV_READ);
		792	ev_io_start (EV_A_ &sigev);
		793	ev_unref (EV_A); /* child watcher should not keep loop alive */
		794	}
		795
		796	/*****************************************************************************/
		797
		798	static WL childs [EV_PID_HASHSIZE];
		799
		800	#ifndef _WIN32
		801
		802	static ev_signal childev;
		803
		804	void inline_speed
		805	child_reap (EV_P_ ev_signal *sw, int chain, int pid, int status)
		806	{
		807	ev_child *w;
		808
		809	for (w = (ev_child *)childs [chain & (EV_PID_HASHSIZE - 1)]; w; w = (ev_child *)((WL)w)->next)
		810	if (w->pid == pid || !w->pid)
234	{	811	{
235	signals [sig].gotsig = 0;	812	ev_set_priority (w, ev_priority (sw)); /* need to do it *now* */
236		813	w->rpid = pid;
237	for (w = signals [sig].head; w; w = w->next)	814	w->rstatus = status;
238	event ((struct ev_watcher *)w, EV_SIGNAL);	815	ev_feed_event (EV_A_ (W)w, EV_CHILD);
239	}	816	}
240	}	817	}
241		818
		819	#ifndef WCONTINUED
		820	# define WCONTINUED 0
		821	#endif
		822
242	static void	823	static void
243	siginit (void)	824	childcb (EV_P_ ev_signal *sw, int revents)
244	{	825	{
245	fcntl (sigpipe [0], F_SETFD, FD_CLOEXEC);	826	int pid, status;
246	fcntl (sigpipe [1], F_SETFD, FD_CLOEXEC);
247		827
248	/* rather than sort out wether we really need nb, set it */	828	/* some systems define WCONTINUED but then fail to support it (linux 2.4) */
249	fcntl (sigpipe [0], F_SETFL, O_NONBLOCK);	829	if (0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED | WCONTINUED)))
250	fcntl (sigpipe [1], F_SETFL, O_NONBLOCK);	830	if (!WCONTINUED
		831	|| errno != EINVAL
		832	|| 0 >= (pid = waitpid (-1, &status, WNOHANG | WUNTRACED)))
		833	return;
251		834
252	evio_set (&sigev, sigpipe [0], EV_READ);	835	/* make sure we are called again until all childs have been reaped */
253	evio_start (&sigev);	836	/* we need to do it this way so that the callback gets called before we continue */
254	}	837	ev_feed_event (EV_A_ (W)sw, EV_SIGNAL);
255		838
		839	child_reap (EV_A_ sw, pid, pid, status);
		840	if (EV_PID_HASHSIZE > 1)
		841	child_reap (EV_A_ sw, 0, pid, status); /* this might trigger a watcher twice, but feed_event catches that */
		842	}
		843
		844	#endif
		845
		846	/*****************************************************************************/
		847
		848	#if EV_USE_PORT
		849	# include "ev_port.c"
		850	#endif
		851	#if EV_USE_KQUEUE
		852	# include "ev_kqueue.c"
		853	#endif
256	#if HAVE_EPOLL	854	#if EV_USE_EPOLL
257	# include "ev_epoll.c"	855	# include "ev_epoll.c"
258	#endif	856	#endif
		857	#if EV_USE_POLL
		858	# include "ev_poll.c"
		859	#endif
259	#if HAVE_SELECT	860	#if EV_USE_SELECT
260	# include "ev_select.c"	861	# include "ev_select.c"
261	#endif	862	#endif
262		863
263	int ev_init (int flags)	864	int
		865	ev_version_major (void)
264	{	866	{
		867	return EV_VERSION_MAJOR;
		868	}
		869
		870	int
		871	ev_version_minor (void)
		872	{
		873	return EV_VERSION_MINOR;
		874	}
		875
		876	/* return true if we are running with elevated privileges and should ignore env variables */
		877	int inline_size
		878	enable_secure (void)
		879	{
		880	#ifdef _WIN32
		881	return 0;
		882	#else
		883	return getuid () != geteuid ()
		884	|| getgid () != getegid ();
		885	#endif
		886	}
		887
		888	unsigned int
		889	ev_supported_backends (void)
		890	{
		891	unsigned int flags = 0;
		892
		893	if (EV_USE_PORT ) flags |= EVBACKEND_PORT;
		894	if (EV_USE_KQUEUE) flags |= EVBACKEND_KQUEUE;
		895	if (EV_USE_EPOLL ) flags |= EVBACKEND_EPOLL;
		896	if (EV_USE_POLL ) flags |= EVBACKEND_POLL;
		897	if (EV_USE_SELECT) flags |= EVBACKEND_SELECT;
		898
		899	return flags;
		900	}
		901
		902	unsigned int
		903	ev_recommended_backends (void)
		904	{
		905	unsigned int flags = ev_supported_backends ();
		906
		907	#ifndef __NetBSD__
		908	/* kqueue is borked on everything but netbsd apparently */
		909	/* it usually doesn't work correctly on anything but sockets and pipes */
		910	flags &= ~EVBACKEND_KQUEUE;
		911	#endif
		912	#ifdef __APPLE__
		913	// flags &= ~EVBACKEND_KQUEUE; for documentation
		914	flags &= ~EVBACKEND_POLL;
		915	#endif
		916
		917	return flags;
		918	}
		919
		920	unsigned int
		921	ev_embeddable_backends (void)
		922	{
		923	return EVBACKEND_EPOLL
		924	| EVBACKEND_KQUEUE
		925	| EVBACKEND_PORT;
		926	}
		927
		928	unsigned int
		929	ev_backend (EV_P)
		930	{
		931	return backend;
		932	}
		933
		934	unsigned int
		935	ev_loop_count (EV_P)
		936	{
		937	return loop_count;
		938	}
		939
		940	static void noinline
		941	loop_init (EV_P_ unsigned int flags)
		942	{
		943	if (!backend)
		944	{
265	#if HAVE_MONOTONIC	945	#if EV_USE_MONOTONIC
266	{	946	{
267	struct timespec ts;	947	struct timespec ts;
268	if (!clock_gettime (CLOCK_MONOTONIC, &ts))	948	if (!clock_gettime (CLOCK_MONOTONIC, &ts))
269	have_monotonic = 1;	949	have_monotonic = 1;
270	}	950	}
271	#endif	951	#endif
272		952
273	ev_now = ev_time ();	953	ev_rt_now = ev_time ();
274	now = get_clock ();	954	mn_now = get_clock ();
275	diff = ev_now - now;	955	now_floor = mn_now;
		956	rtmn_diff = ev_rt_now - mn_now;
276		957
277	if (pipe (sigpipe))	958	/* pid check not overridable via env */
278	return 0;	959	#ifndef _WIN32
		960	if (flags & EVFLAG_FORKCHECK)
		961	curpid = getpid ();
		962	#endif
279		963
280	ev_method = EVMETHOD_NONE;	964	if (!(flags & EVFLAG_NOENV)
		965	&& !enable_secure ()
		966	&& getenv ("LIBEV_FLAGS"))
		967	flags = atoi (getenv ("LIBEV_FLAGS"));
		968
		969	if (!(flags & 0x0000ffffUL))
		970	flags |= ev_recommended_backends ();
		971
		972	backend = 0;
		973	backend_fd = -1;
		974	#if EV_USE_INOTIFY
		975	fs_fd = -2;
		976	#endif
		977
		978	#if EV_USE_PORT
		979	if (!backend && (flags & EVBACKEND_PORT )) backend = port_init (EV_A_ flags);
		980	#endif
		981	#if EV_USE_KQUEUE
		982	if (!backend && (flags & EVBACKEND_KQUEUE)) backend = kqueue_init (EV_A_ flags);
		983	#endif
281	#if HAVE_EPOLL	984	#if EV_USE_EPOLL
282	if (ev_method == EVMETHOD_NONE) epoll_init (flags);	985	if (!backend && (flags & EVBACKEND_EPOLL )) backend = epoll_init (EV_A_ flags);
283	#endif	986	#endif
		987	#if EV_USE_POLL
		988	if (!backend && (flags & EVBACKEND_POLL )) backend = poll_init (EV_A_ flags);
		989	#endif
284	#if HAVE_SELECT	990	#if EV_USE_SELECT
285	if (ev_method == EVMETHOD_NONE) select_init (flags);	991	if (!backend && (flags & EVBACKEND_SELECT)) backend = select_init (EV_A_ flags);
286	#endif	992	#endif
287		993
288	if (ev_method)
289	{
290	evw_init (&sigev, sigcb, 0);	994	ev_init (&sigev, sigcb);
291	siginit ();	995	ev_set_priority (&sigev, EV_MAXPRI);
292	}	996	}
293
294	return ev_method;
295	}	997	}
296		998
297	void ev_prefork (void)	999	static void noinline
298	{	1000	loop_destroy (EV_P)
299	}
300
301	void ev_postfork_parent (void)
302	{
303	}
304
305	void ev_postfork_child (void)
306	{
307	#if HAVE_EPOLL
308	if (ev_method == EVMETHOD_EPOLL)
309	epoll_postfork_child ();
310	#endif
311
312	evio_stop (&sigev);
313	close (sigpipe [0]);
314	close (sigpipe [1]);
315	pipe (sigpipe);
316	siginit ();
317	}
318
319	static void
320	fd_reify (void)
321	{	1001	{
322	int i;	1002	int i;
323		1003
324	for (i = 0; i < fdchangecnt; ++i)	1004	#if EV_USE_INOTIFY
		1005	if (fs_fd >= 0)
		1006	close (fs_fd);
		1007	#endif
		1008
		1009	if (backend_fd >= 0)
		1010	close (backend_fd);
		1011
		1012	#if EV_USE_PORT
		1013	if (backend == EVBACKEND_PORT ) port_destroy (EV_A);
		1014	#endif
		1015	#if EV_USE_KQUEUE
		1016	if (backend == EVBACKEND_KQUEUE) kqueue_destroy (EV_A);
		1017	#endif
		1018	#if EV_USE_EPOLL
		1019	if (backend == EVBACKEND_EPOLL ) epoll_destroy (EV_A);
		1020	#endif
		1021	#if EV_USE_POLL
		1022	if (backend == EVBACKEND_POLL ) poll_destroy (EV_A);
		1023	#endif
		1024	#if EV_USE_SELECT
		1025	if (backend == EVBACKEND_SELECT) select_destroy (EV_A);
		1026	#endif
		1027
		1028	for (i = NUMPRI; i--; )
		1029	{
		1030	array_free (pending, [i]);
		1031	#if EV_IDLE_ENABLE
		1032	array_free (idle, [i]);
		1033	#endif
325	{	1034	}
326	int fd = fdchanges [i];
327	ANFD *anfd = anfds + fd;
328	struct ev_io *w;
329		1035
330	int wev = 0;	1036	/* have to use the microsoft-never-gets-it-right macro */
		1037	array_free (fdchange, EMPTY);
		1038	array_free (timer, EMPTY);
		1039	#if EV_PERIODIC_ENABLE
		1040	array_free (periodic, EMPTY);
		1041	#endif
		1042	array_free (prepare, EMPTY);
		1043	array_free (check, EMPTY);
331		1044
332	for (w = anfd->head; w; w = w->next)	1045	backend = 0;
333	wev |= w->events;	1046	}
334		1047
335	if (anfd->wev != wev)	1048	void inline_size infy_fork (EV_P);
		1049
		1050	void inline_size
		1051	loop_fork (EV_P)
		1052	{
		1053	#if EV_USE_PORT
		1054	if (backend == EVBACKEND_PORT ) port_fork (EV_A);
		1055	#endif
		1056	#if EV_USE_KQUEUE
		1057	if (backend == EVBACKEND_KQUEUE) kqueue_fork (EV_A);
		1058	#endif
		1059	#if EV_USE_EPOLL
		1060	if (backend == EVBACKEND_EPOLL ) epoll_fork (EV_A);
		1061	#endif
		1062	#if EV_USE_INOTIFY
		1063	infy_fork (EV_A);
		1064	#endif
		1065
		1066	if (ev_is_active (&sigev))
		1067	{
		1068	/* default loop */
		1069
		1070	ev_ref (EV_A);
		1071	ev_io_stop (EV_A_ &sigev);
		1072	close (sigpipe [0]);
		1073	close (sigpipe [1]);
		1074
		1075	while (pipe (sigpipe))
		1076	syserr ("(libev) error creating pipe");
		1077
		1078	siginit (EV_A);
		1079	}
		1080
		1081	postfork = 0;
		1082	}
		1083
		1084	#if EV_MULTIPLICITY
		1085	struct ev_loop *
		1086	ev_loop_new (unsigned int flags)
		1087	{
		1088	struct ev_loop *loop = (struct ev_loop *)ev_malloc (sizeof (struct ev_loop));
		1089
		1090	memset (loop, 0, sizeof (struct ev_loop));
		1091
		1092	loop_init (EV_A_ flags);
		1093
		1094	if (ev_backend (EV_A))
		1095	return loop;
		1096
		1097	return 0;
		1098	}
		1099
		1100	void
		1101	ev_loop_destroy (EV_P)
		1102	{
		1103	loop_destroy (EV_A);
		1104	ev_free (loop);
		1105	}
		1106
		1107	void
		1108	ev_loop_fork (EV_P)
		1109	{
		1110	postfork = 1;
		1111	}
		1112
		1113	#endif
		1114
		1115	#if EV_MULTIPLICITY
		1116	struct ev_loop *
		1117	ev_default_loop_init (unsigned int flags)
		1118	#else
		1119	int
		1120	ev_default_loop (unsigned int flags)
		1121	#endif
		1122	{
		1123	if (sigpipe [0] == sigpipe [1])
		1124	if (pipe (sigpipe))
		1125	return 0;
		1126
		1127	if (!ev_default_loop_ptr)
		1128	{
		1129	#if EV_MULTIPLICITY
		1130	struct ev_loop *loop = ev_default_loop_ptr = &default_loop_struct;
		1131	#else
		1132	ev_default_loop_ptr = 1;
		1133	#endif
		1134
		1135	loop_init (EV_A_ flags);
		1136
		1137	if (ev_backend (EV_A))
336	{	1138	{
337	method_modify (fd, anfd->wev, wev);	1139	siginit (EV_A);
338	anfd->wev = wev;	1140
		1141	#ifndef _WIN32
		1142	ev_signal_init (&childev, childcb, SIGCHLD);
		1143	ev_set_priority (&childev, EV_MAXPRI);
		1144	ev_signal_start (EV_A_ &childev);
		1145	ev_unref (EV_A); /* child watcher should not keep loop alive */
		1146	#endif
339	}	1147	}
		1148	else
		1149	ev_default_loop_ptr = 0;
340	}	1150	}
341		1151
342	fdchangecnt = 0;	1152	return ev_default_loop_ptr;
343	}	1153	}
344		1154
345	static void	1155	void
		1156	ev_default_destroy (void)
		1157	{
		1158	#if EV_MULTIPLICITY
		1159	struct ev_loop *loop = ev_default_loop_ptr;
		1160	#endif
		1161
		1162	#ifndef _WIN32
		1163	ev_ref (EV_A); /* child watcher */
		1164	ev_signal_stop (EV_A_ &childev);
		1165	#endif
		1166
		1167	ev_ref (EV_A); /* signal watcher */
		1168	ev_io_stop (EV_A_ &sigev);
		1169
		1170	close (sigpipe [0]); sigpipe [0] = 0;
		1171	close (sigpipe [1]); sigpipe [1] = 0;
		1172
		1173	loop_destroy (EV_A);
		1174	}
		1175
		1176	void
		1177	ev_default_fork (void)
		1178	{
		1179	#if EV_MULTIPLICITY
		1180	struct ev_loop *loop = ev_default_loop_ptr;
		1181	#endif
		1182
		1183	if (backend)
		1184	postfork = 1;
		1185	}
		1186
		1187	/*****************************************************************************/
		1188
		1189	void
		1190	ev_invoke (EV_P_ void *w, int revents)
		1191	{
		1192	EV_CB_INVOKE ((W)w, revents);
		1193	}
		1194
		1195	void inline_speed
346	call_pending ()	1196	call_pending (EV_P)
347	{	1197	{
348	int i;	1198	int pri;
349		1199
350	for (i = 0; i < pendingcnt; ++i)	1200	for (pri = NUMPRI; pri--; )
		1201	while (pendingcnt [pri])
351	{	1202	{
352	ANPENDING *p = pendings + i;	1203	ANPENDING *p = pendings [pri] + --pendingcnt [pri];
353		1204
354	if (p->w)	1205	if (expect_true (p->w))
355	{	1206	{
		1207	/*assert (("non-pending watcher on pending list", p->w->pending));*/
		1208
356	p->w->pending = 0;	1209	p->w->pending = 0;
357	p->w->cb (p->w, p->events);	1210	EV_CB_INVOKE (p->w, p->events);
358	}	1211	}
359	}	1212	}
360
361	pendingcnt = 0;
362	}	1213	}
363		1214
364	static void	1215	void inline_size
365	timers_reify (struct ev_timer **timers, int timercnt, ev_tstamp now)	1216	timers_reify (EV_P)
366	{	1217	{
367	while (timercnt && timers [0]->at <= now)	1218	while (timercnt && ((WT)timers [0])->at <= mn_now)
368	{	1219	{
369	struct ev_timer *w = timers [0];	1220	ev_timer *w = (ev_timer *)timers [0];
		1221
		1222	/*assert (("inactive timer on timer heap detected", ev_is_active (w)));*/
370		1223
371	/* first reschedule or stop timer */	1224	/* first reschedule or stop timer */
372	if (w->repeat)	1225	if (w->repeat)
373	{	1226	{
374	if (w->is_abs)	1227	assert (("negative ev_timer repeat value found while processing timers", w->repeat > 0.));
375	w->at += floor ((now - w->at) / w->repeat + 1.) * w->repeat;	1228
376	else
377	w->at = now + w->repeat;	1229	((WT)w)->at += w->repeat;
378		1230	if (((WT)w)->at < mn_now)
379	assert (w->at > now);	1231	((WT)w)->at = mn_now;
380		1232
381	downheap (timers, timercnt, 0);	1233	downheap (timers, timercnt, 0);
382	}	1234	}
383	else	1235	else
		1236	ev_timer_stop (EV_A_ w); /* nonrepeating: stop timer */
		1237
		1238	ev_feed_event (EV_A_ (W)w, EV_TIMEOUT);
		1239	}
		1240	}
		1241
		1242	#if EV_PERIODIC_ENABLE
		1243	void inline_size
		1244	periodics_reify (EV_P)
		1245	{
		1246	while (periodiccnt && ((WT)periodics [0])->at <= ev_rt_now)
		1247	{
		1248	ev_periodic *w = (ev_periodic *)periodics [0];
		1249
		1250	/*assert (("inactive timer on periodic heap detected", ev_is_active (w)));*/
		1251
		1252	/* first reschedule or stop timer */
		1253	if (w->reschedule_cb)
384	{	1254	{
385	evtimer_stop (w); /* nonrepeating: stop timer */	1255	((WT)w)->at = w->reschedule_cb (w, ev_rt_now + TIME_EPSILON);
386	--timercnt; /* maybe pass by reference instead? */	1256	assert (("ev_periodic reschedule callback returned time in the past", ((WT)w)->at > ev_rt_now));
		1257	downheap (periodics, periodiccnt, 0);
387	}	1258	}
		1259	else if (w->interval)
		1260	{
		1261	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
		1262	if (((WT)w)->at - ev_rt_now <= TIME_EPSILON) ((WT)w)->at += w->interval;
		1263	assert (("ev_periodic timeout in the past detected while processing timers, negative interval?", ((WT)w)->at > ev_rt_now));
		1264	downheap (periodics, periodiccnt, 0);
		1265	}
		1266	else
		1267	ev_periodic_stop (EV_A_ w); /* nonrepeating: stop timer */
388		1268
389	event ((struct ev_watcher *)w, EV_TIMEOUT);	1269	ev_feed_event (EV_A_ (W)w, EV_PERIODIC);
390	}	1270	}
391	}	1271	}
392		1272
393	static void	1273	static void noinline
394	time_update ()	1274	periodics_reschedule (EV_P)
395	{	1275	{
396	int i;	1276	int i;
397	ev_now = ev_time ();
398		1277
399	if (have_monotonic)	1278	/* adjust periodics after time jump */
		1279	for (i = 0; i < periodiccnt; ++i)
		1280	{
		1281	ev_periodic *w = (ev_periodic *)periodics [i];
		1282
		1283	if (w->reschedule_cb)
		1284	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1285	else if (w->interval)
		1286	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
400	{	1287	}
401	ev_tstamp odiff = diff;
402		1288
403	/* detecting time jumps is much more difficult */	1289	/* now rebuild the heap */
404	for (i = 2; --i; ) /* loop a few times, before making important decisions */	1290	for (i = periodiccnt >> 1; i--; )
		1291	downheap (periodics, periodiccnt, i);
		1292	}
		1293	#endif
		1294
		1295	#if EV_IDLE_ENABLE
		1296	void inline_size
		1297	idle_reify (EV_P)
		1298	{
		1299	if (expect_false (idleall))
		1300	{
		1301	int pri;
		1302
		1303	for (pri = NUMPRI; pri--; )
405	{	1304	{
		1305	if (pendingcnt [pri])
		1306	break;
		1307
		1308	if (idlecnt [pri])
		1309	{
		1310	queue_events (EV_A_ (W *)idles [pri], idlecnt [pri], EV_IDLE);
		1311	break;
		1312	}
		1313	}
		1314	}
		1315	}
		1316	#endif
		1317
		1318	void inline_speed
		1319	time_update (EV_P_ ev_tstamp max_block)
		1320	{
		1321	int i;
		1322
		1323	#if EV_USE_MONOTONIC
		1324	if (expect_true (have_monotonic))
		1325	{
		1326	ev_tstamp odiff = rtmn_diff;
		1327
406	now = get_clock ();	1328	mn_now = get_clock ();
		1329
		1330	/* only fetch the realtime clock every 0.5*MIN_TIMEJUMP seconds */
		1331	/* interpolate in the meantime */
		1332	if (expect_true (mn_now - now_floor < MIN_TIMEJUMP * .5))
		1333	{
		1334	ev_rt_now = rtmn_diff + mn_now;
		1335	return;
		1336	}
		1337
		1338	now_floor = mn_now;
		1339	ev_rt_now = ev_time ();
		1340
		1341	/* loop a few times, before making important decisions.
		1342	* on the choice of "4": one iteration isn't enough,
		1343	* in case we get preempted during the calls to
		1344	* ev_time and get_clock. a second call is almost guaranteed
		1345	* to succeed in that case, though. and looping a few more times
		1346	* doesn't hurt either as we only do this on time-jumps or
		1347	* in the unlikely event of having been preempted here.
		1348	*/
		1349	for (i = 4; --i; )
		1350	{
407	diff = ev_now - now;	1351	rtmn_diff = ev_rt_now - mn_now;
408		1352
409	if (fabs (odiff - diff) < MIN_TIMEJUMP)	1353	if (fabs (odiff - rtmn_diff) < MIN_TIMEJUMP)
410	return; /* all is well */	1354	return; /* all is well */
411		1355
412	ev_now = ev_time ();	1356	ev_rt_now = ev_time ();
		1357	mn_now = get_clock ();
		1358	now_floor = mn_now;
413	}	1359	}
414		1360
415	/* time jump detected, reschedule atimers */	1361	# if EV_PERIODIC_ENABLE
416	for (i = 0; i < atimercnt; ++i)	1362	periodics_reschedule (EV_A);
		1363	# endif
		1364	/* no timer adjustment, as the monotonic clock doesn't jump */
		1365	/* timers_reschedule (EV_A_ rtmn_diff - odiff) */
		1366	}
		1367	else
		1368	#endif
		1369	{
		1370	ev_rt_now = ev_time ();
		1371
		1372	if (expect_false (mn_now > ev_rt_now || ev_rt_now > mn_now + max_block + MIN_TIMEJUMP))
417	{	1373	{
418	struct ev_timer *w = atimers [i];	1374	#if EV_PERIODIC_ENABLE
419	w->at += ceil ((ev_now - w->at) / w->repeat + 1.) * w->repeat;	1375	periodics_reschedule (EV_A);
		1376	#endif
		1377	/* adjust timers. this is easy, as the offset is the same for all of them */
		1378	for (i = 0; i < timercnt; ++i)
		1379	((WT)timers [i])->at += ev_rt_now - mn_now;
420	}	1380	}
421	}
422	else
423	{
424	if (now > ev_now || now < ev_now - MAX_BLOCKTIME - MIN_TIMEJUMP)
425	/* time jump detected, adjust rtimers */
426	for (i = 0; i < rtimercnt; ++i)
427	rtimers [i]->at += ev_now - now;
428		1381
429	now = ev_now;	1382	mn_now = ev_rt_now;
430	}	1383	}
431	}	1384	}
432		1385
433	int ev_loop_done;	1386	void
		1387	ev_ref (EV_P)
		1388	{
		1389	++activecnt;
		1390	}
434		1391
		1392	void
		1393	ev_unref (EV_P)
		1394	{
		1395	--activecnt;
		1396	}
		1397
		1398	static int loop_done;
		1399
		1400	void
435	void ev_loop (int flags)	1401	ev_loop (EV_P_ int flags)
436	{	1402	{
437	double block;
438	ev_loop_done = flags & EVLOOP_ONESHOT;	1403	loop_done = flags & (EVLOOP_ONESHOT | EVLOOP_NONBLOCK)
		1404	? EVUNLOOP_ONE
		1405	: EVUNLOOP_CANCEL;
		1406
		1407	call_pending (EV_A); /* in case we recurse, ensure ordering stays nice and clean */
439		1408
440	do	1409	do
441	{	1410	{
		1411	#ifndef _WIN32
		1412	if (expect_false (curpid)) /* penalise the forking check even more */
		1413	if (expect_false (getpid () != curpid))
		1414	{
		1415	curpid = getpid ();
		1416	postfork = 1;
		1417	}
		1418	#endif
		1419
		1420	#if EV_FORK_ENABLE
		1421	/* we might have forked, so queue fork handlers */
		1422	if (expect_false (postfork))
		1423	if (forkcnt)
		1424	{
		1425	queue_events (EV_A_ (W *)forks, forkcnt, EV_FORK);
		1426	call_pending (EV_A);
		1427	}
		1428	#endif
		1429
		1430	/* queue prepare watchers (and execute them) */
		1431	if (expect_false (preparecnt))
		1432	{
		1433	queue_events (EV_A_ (W *)prepares, preparecnt, EV_PREPARE);
		1434	call_pending (EV_A);
		1435	}
		1436
		1437	if (expect_false (!activecnt))
		1438	break;
		1439
		1440	/* we might have forked, so reify kernel state if necessary */
		1441	if (expect_false (postfork))
		1442	loop_fork (EV_A);
		1443
442	/* update fd-related kernel structures */	1444	/* update fd-related kernel structures */
443	fd_reify ();	1445	fd_reify (EV_A);
444		1446
445	/* calculate blocking time */	1447	/* calculate blocking time */
446	if (flags & EVLOOP_NONBLOCK)	1448	{
447	block = 0.;	1449	ev_tstamp block;
		1450
		1451	if (expect_false (flags & EVLOOP_NONBLOCK || idleall || !activecnt))
		1452	block = 0.; /* do not block at all */
448	else	1453	else
449	{	1454	{
		1455	/* update time to cancel out callback processing overhead */
		1456	time_update (EV_A_ 1e100);
		1457
450	block = MAX_BLOCKTIME;	1458	block = MAX_BLOCKTIME;
451		1459
452	if (rtimercnt)	1460	if (timercnt)
453	{	1461	{
454	ev_tstamp to = rtimers [0]->at - get_clock () + method_fudge;	1462	ev_tstamp to = ((WT)timers [0])->at - mn_now + backend_fudge;
455	if (block > to) block = to;	1463	if (block > to) block = to;
456	}	1464	}
457		1465
		1466	#if EV_PERIODIC_ENABLE
458	if (atimercnt)	1467	if (periodiccnt)
459	{	1468	{
460	ev_tstamp to = atimers [0]->at - ev_time () + method_fudge;	1469	ev_tstamp to = ((WT)periodics [0])->at - ev_rt_now + backend_fudge;
461	if (block > to) block = to;	1470	if (block > to) block = to;
462	}	1471	}
		1472	#endif
463		1473
464	if (block < 0.) block = 0.;	1474	if (expect_false (block < 0.)) block = 0.;
465	}	1475	}
466		1476
467	method_poll (block);	1477	++loop_count;
		1478	backend_poll (EV_A_ block);
468		1479
469	/* update ev_now, do magic */	1480	/* update ev_rt_now, do magic */
470	time_update ();	1481	time_update (EV_A_ block);
		1482	}
471		1483
472	/* put pending timers into pendign queue and reschedule them */	1484	/* queue pending timers and reschedule them */
473	/* absolute timers first */	1485	timers_reify (EV_A); /* relative timers called last */
474	timers_reify (atimers, atimercnt, ev_now);	1486	#if EV_PERIODIC_ENABLE
475	/* relative timers second */	1487	periodics_reify (EV_A); /* absolute timers called first */
476	timers_reify (rtimers, rtimercnt, now);	1488	#endif
477		1489
		1490	#if EV_IDLE_ENABLE
		1491	/* queue idle watchers unless other events are pending */
		1492	idle_reify (EV_A);
		1493	#endif
		1494
		1495	/* queue check watchers, to be executed first */
		1496	if (expect_false (checkcnt))
		1497	queue_events (EV_A_ (W *)checks, checkcnt, EV_CHECK);
		1498
478	call_pending ();	1499	call_pending (EV_A);
479	}
480	while (!ev_loop_done);
481	}
482		1500
483	static void	1501	}
484	wlist_add (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1502	while (expect_true (activecnt && !loop_done));
		1503
		1504	if (loop_done == EVUNLOOP_ONE)
		1505	loop_done = EVUNLOOP_CANCEL;
		1506	}
		1507
		1508	void
		1509	ev_unloop (EV_P_ int how)
		1510	{
		1511	loop_done = how;
		1512	}
		1513
		1514	/*****************************************************************************/
		1515
		1516	void inline_size
		1517	wlist_add (WL *head, WL elem)
485	{	1518	{
486	elem->next = *head;	1519	elem->next = *head;
487	*head = elem;	1520	*head = elem;
488	}	1521	}
489		1522
490	static void	1523	void inline_size
491	wlist_del (struct ev_watcher_list **head, struct ev_watcher_list *elem)	1524	wlist_del (WL *head, WL elem)
492	{	1525	{
493	while (*head)	1526	while (*head)
494	{	1527	{
495	if (*head == elem)	1528	if (*head == elem)
496	{	1529	{
…		…
500		1533
501	head = &(*head)->next;	1534	head = &(*head)->next;
502	}	1535	}
503	}	1536	}
504		1537
505	static void	1538	void inline_speed
506	ev_start (struct ev_watcher *w, int active)	1539	clear_pending (EV_P_ W w)
507	{	1540	{
		1541	if (w->pending)
		1542	{
		1543	pendings [ABSPRI (w)][w->pending - 1].w = 0;
508	w->pending = 0;	1544	w->pending = 0;
		1545	}
		1546	}
		1547
		1548	int
		1549	ev_clear_pending (EV_P_ void *w)
		1550	{
		1551	W w_ = (W)w;
		1552	int pending = w_->pending;
		1553
		1554	if (expect_true (pending))
		1555	{
		1556	ANPENDING *p = pendings [ABSPRI (w_)] + pending - 1;
		1557	w_->pending = 0;
		1558	p->w = 0;
		1559	return p->events;
		1560	}
		1561	else
		1562	return 0;
		1563	}
		1564
		1565	void inline_size
		1566	pri_adjust (EV_P_ W w)
		1567	{
		1568	int pri = w->priority;
		1569	pri = pri < EV_MINPRI ? EV_MINPRI : pri;
		1570	pri = pri > EV_MAXPRI ? EV_MAXPRI : pri;
		1571	w->priority = pri;
		1572	}
		1573
		1574	void inline_speed
		1575	ev_start (EV_P_ W w, int active)
		1576	{
		1577	pri_adjust (EV_A_ w);
509	w->active = active;	1578	w->active = active;
		1579	ev_ref (EV_A);
510	}	1580	}
511		1581
512	static void	1582	void inline_size
513	ev_stop (struct ev_watcher *w)	1583	ev_stop (EV_P_ W w)
514	{	1584	{
515	if (w->pending)	1585	ev_unref (EV_A);
516	pendings [w->pending - 1].w = 0;
517
518	w->active = 0;	1586	w->active = 0;
519	/* nop */
520	}	1587	}
521		1588
522	void	1589	/*****************************************************************************/
		1590
		1591	void noinline
523	evio_start (struct ev_io *w)	1592	ev_io_start (EV_P_ ev_io *w)
		1593	{
		1594	int fd = w->fd;
		1595
		1596	if (expect_false (ev_is_active (w)))
		1597	return;
		1598
		1599	assert (("ev_io_start called with negative fd", fd >= 0));
		1600
		1601	ev_start (EV_A_ (W)w, 1);
		1602	array_needsize (ANFD, anfds, anfdmax, fd + 1, anfds_init);
		1603	wlist_add (&anfds[fd].head, (WL)w);
		1604
		1605	fd_change (EV_A_ fd, w->events & EV_IOFDSET);
		1606	w->events &= ~ EV_IOFDSET;
		1607	}
		1608
		1609	void noinline
		1610	ev_io_stop (EV_P_ ev_io *w)
		1611	{
		1612	clear_pending (EV_A_ (W)w);
		1613	if (expect_false (!ev_is_active (w)))
		1614	return;
		1615
		1616	assert (("ev_io_start called with illegal fd (must stay constant after start!)", w->fd >= 0 && w->fd < anfdmax));
		1617
		1618	wlist_del (&anfds[w->fd].head, (WL)w);
		1619	ev_stop (EV_A_ (W)w);
		1620
		1621	fd_change (EV_A_ w->fd, 0);
		1622	}
		1623
		1624	void noinline
		1625	ev_timer_start (EV_P_ ev_timer *w)
		1626	{
		1627	if (expect_false (ev_is_active (w)))
		1628	return;
		1629
		1630	((WT)w)->at += mn_now;
		1631
		1632	assert (("ev_timer_start called with negative timer repeat value", w->repeat >= 0.));
		1633
		1634	ev_start (EV_A_ (W)w, ++timercnt);
		1635	array_needsize (WT, timers, timermax, timercnt, EMPTY2);
		1636	timers [timercnt - 1] = (WT)w;
		1637	upheap (timers, timercnt - 1);
		1638
		1639	/*assert (("internal timer heap corruption", timers [((W)w)->active - 1] == w));*/
		1640	}
		1641
		1642	void noinline
		1643	ev_timer_stop (EV_P_ ev_timer *w)
		1644	{
		1645	clear_pending (EV_A_ (W)w);
		1646	if (expect_false (!ev_is_active (w)))
		1647	return;
		1648
		1649	assert (("internal timer heap corruption", timers [((W)w)->active - 1] == (WT)w));
		1650
		1651	{
		1652	int active = ((W)w)->active;
		1653
		1654	if (expect_true (--active < --timercnt))
		1655	{
		1656	timers [active] = timers [timercnt];
		1657	adjustheap (timers, timercnt, active);
		1658	}
		1659	}
		1660
		1661	((WT)w)->at -= mn_now;
		1662
		1663	ev_stop (EV_A_ (W)w);
		1664	}
		1665
		1666	void noinline
		1667	ev_timer_again (EV_P_ ev_timer *w)
524	{	1668	{
525	if (ev_is_active (w))	1669	if (ev_is_active (w))
526	return;
527
528	int fd = w->fd;
529
530	ev_start ((struct ev_watcher *)w, 1);
531	array_needsize (anfds, anfdmax, fd + 1, anfds_init);
532	wlist_add ((struct ev_watcher_list **)&anfds[fd].head, (struct ev_watcher_list *)w);
533
534	++fdchangecnt;
535	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
536	fdchanges [fdchangecnt - 1] = fd;
537	}
538
539	void
540	evio_stop (struct ev_io *w)
541	{
542	if (!ev_is_active (w))
543	return;
544
545	wlist_del ((struct ev_watcher_list **)&anfds[w->fd].head, (struct ev_watcher_list *)w);
546	ev_stop ((struct ev_watcher *)w);
547
548	++fdchangecnt;
549	array_needsize (fdchanges, fdchangemax, fdchangecnt, );
550	fdchanges [fdchangecnt - 1] = w->fd;
551	}
552
553	void
554	evtimer_start (struct ev_timer *w)
555	{
556	if (ev_is_active (w))
557	return;
558
559	if (w->is_abs)
560	{	1670	{
561	/* this formula differs from the one in timer_reify becuse we do not round up */
562	if (w->repeat)	1671	if (w->repeat)
563	w->at += ceil ((ev_now - w->at) / w->repeat) * w->repeat;	1672	{
		1673	((WT)w)->at = mn_now + w->repeat;
		1674	adjustheap (timers, timercnt, ((W)w)->active - 1);
		1675	}
		1676	else
		1677	ev_timer_stop (EV_A_ w);
		1678	}
		1679	else if (w->repeat)
		1680	{
		1681	w->at = w->repeat;
		1682	ev_timer_start (EV_A_ w);
		1683	}
		1684	}
564		1685
565	ev_start ((struct ev_watcher *)w, ++atimercnt);	1686	#if EV_PERIODIC_ENABLE
566	array_needsize (atimers, atimermax, atimercnt, );	1687	void noinline
567	atimers [atimercnt - 1] = w;	1688	ev_periodic_start (EV_P_ ev_periodic *w)
568	upheap (atimers, atimercnt - 1);	1689	{
		1690	if (expect_false (ev_is_active (w)))
		1691	return;
		1692
		1693	if (w->reschedule_cb)
		1694	((WT)w)->at = w->reschedule_cb (w, ev_rt_now);
		1695	else if (w->interval)
		1696	{
		1697	assert (("ev_periodic_start called with negative interval value", w->interval >= 0.));
		1698	/* this formula differs from the one in periodic_reify because we do not always round up */
		1699	((WT)w)->at = w->offset + ceil ((ev_rt_now - w->offset) / w->interval) * w->interval;
569	}	1700	}
570	else	1701	else
571	{	1702	((WT)w)->at = w->offset;
572	w->at += now;
573		1703
574	ev_start ((struct ev_watcher *)w, ++rtimercnt);	1704	ev_start (EV_A_ (W)w, ++periodiccnt);
575	array_needsize (rtimers, rtimermax, rtimercnt, );	1705	array_needsize (WT, periodics, periodicmax, periodiccnt, EMPTY2);
576	rtimers [rtimercnt - 1] = w;	1706	periodics [periodiccnt - 1] = (WT)w;
577	upheap (rtimers, rtimercnt - 1);	1707	upheap (periodics, periodiccnt - 1);
578	}
579		1708
		1709	/*assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == w));*/
580	}	1710	}
581		1711
582	void	1712	void noinline
583	evtimer_stop (struct ev_timer *w)	1713	ev_periodic_stop (EV_P_ ev_periodic *w)
584	{	1714	{
		1715	clear_pending (EV_A_ (W)w);
585	if (!ev_is_active (w))	1716	if (expect_false (!ev_is_active (w)))
586	return;	1717	return;
587		1718
588	if (w->is_abs)	1719	assert (("internal periodic heap corruption", periodics [((W)w)->active - 1] == (WT)w));
		1720
589	{	1721	{
590	if (w->active < atimercnt--)	1722	int active = ((W)w)->active;
		1723
		1724	if (expect_true (--active < --periodiccnt))
591	{	1725	{
592	atimers [w->active - 1] = atimers [atimercnt];	1726	periodics [active] = periodics [periodiccnt];
593	downheap (atimers, atimercnt, w->active - 1);	1727	adjustheap (periodics, periodiccnt, active);
594	}	1728	}
595	}	1729	}
596	else
597	{
598	if (w->active < rtimercnt--)
599	{
600	rtimers [w->active - 1] = rtimers [rtimercnt];
601	downheap (rtimers, rtimercnt, w->active - 1);
602	}
603	}
604		1730
605	ev_stop ((struct ev_watcher *)w);	1731	ev_stop (EV_A_ (W)w);
606	}	1732	}
607		1733
608	void	1734	void noinline
		1735	ev_periodic_again (EV_P_ ev_periodic *w)
		1736	{
		1737	/* TODO: use adjustheap and recalculation */
		1738	ev_periodic_stop (EV_A_ w);
		1739	ev_periodic_start (EV_A_ w);
		1740	}
		1741	#endif
		1742
		1743	#ifndef SA_RESTART
		1744	# define SA_RESTART 0
		1745	#endif
		1746
		1747	void noinline
609	evsignal_start (struct ev_signal *w)	1748	ev_signal_start (EV_P_ ev_signal *w)
610	{	1749	{
		1750	#if EV_MULTIPLICITY
		1751	assert (("signal watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1752	#endif
611	if (ev_is_active (w))	1753	if (expect_false (ev_is_active (w)))
612	return;	1754	return;
613		1755
614	ev_start ((struct ev_watcher *)w, 1);	1756	assert (("ev_signal_start called with illegal signal number", w->signum > 0));
		1757
		1758	{
		1759	#ifndef _WIN32
		1760	sigset_t full, prev;
		1761	sigfillset (&full);
		1762	sigprocmask (SIG_SETMASK, &full, &prev);
		1763	#endif
		1764
615	array_needsize (signals, signalmax, w->signum, signals_init);	1765	array_needsize (ANSIG, signals, signalmax, w->signum, signals_init);
616	wlist_add ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);
617		1766
		1767	#ifndef _WIN32
		1768	sigprocmask (SIG_SETMASK, &prev, 0);
		1769	#endif
		1770	}
		1771
		1772	ev_start (EV_A_ (W)w, 1);
		1773	wlist_add (&signals [w->signum - 1].head, (WL)w);
		1774
618	if (!w->next)	1775	if (!((WL)w)->next)
619	{	1776	{
		1777	#if _WIN32
		1778	signal (w->signum, sighandler);
		1779	#else
620	struct sigaction sa;	1780	struct sigaction sa;
621	sa.sa_handler = sighandler;	1781	sa.sa_handler = sighandler;
622	sigfillset (&sa.sa_mask);	1782	sigfillset (&sa.sa_mask);
623	sa.sa_flags = 0;	1783	sa.sa_flags = SA_RESTART; /* if restarting works we save one iteration */
624	sigaction (w->signum, &sa, 0);	1784	sigaction (w->signum, &sa, 0);
		1785	#endif
625	}	1786	}
626	}	1787	}
627		1788
628	void	1789	void noinline
629	evsignal_stop (struct ev_signal *w)	1790	ev_signal_stop (EV_P_ ev_signal *w)
630	{	1791	{
		1792	clear_pending (EV_A_ (W)w);
631	if (!ev_is_active (w))	1793	if (expect_false (!ev_is_active (w)))
632	return;	1794	return;
633		1795
634	wlist_del ((struct ev_watcher_list **)&signals [w->signum - 1].head, (struct ev_watcher_list *)w);	1796	wlist_del (&signals [w->signum - 1].head, (WL)w);
635	ev_stop ((struct ev_watcher *)w);	1797	ev_stop (EV_A_ (W)w);
636		1798
637	if (!signals [w->signum - 1].head)	1799	if (!signals [w->signum - 1].head)
638	signal (w->signum, SIG_DFL);	1800	signal (w->signum, SIG_DFL);
639	}	1801	}
640		1802
		1803	void
		1804	ev_child_start (EV_P_ ev_child *w)
		1805	{
		1806	#if EV_MULTIPLICITY
		1807	assert (("child watchers are only supported in the default loop", loop == ev_default_loop_ptr));
		1808	#endif
		1809	if (expect_false (ev_is_active (w)))
		1810	return;
		1811
		1812	ev_start (EV_A_ (W)w, 1);
		1813	wlist_add (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1814	}
		1815
		1816	void
		1817	ev_child_stop (EV_P_ ev_child *w)
		1818	{
		1819	clear_pending (EV_A_ (W)w);
		1820	if (expect_false (!ev_is_active (w)))
		1821	return;
		1822
		1823	wlist_del (&childs [w->pid & (EV_PID_HASHSIZE - 1)], (WL)w);
		1824	ev_stop (EV_A_ (W)w);
		1825	}
		1826
		1827	#if EV_STAT_ENABLE
		1828
		1829	# ifdef _WIN32
		1830	# undef lstat
		1831	# define lstat(a,b) _stati64 (a,b)
		1832	# endif
		1833
		1834	#define DEF_STAT_INTERVAL 5.0074891
		1835	#define MIN_STAT_INTERVAL 0.1074891
		1836
		1837	static void noinline stat_timer_cb (EV_P_ ev_timer *w_, int revents);
		1838
		1839	#if EV_USE_INOTIFY
		1840	# define EV_INOTIFY_BUFSIZE 8192
		1841
		1842	static void noinline
		1843	infy_add (EV_P_ ev_stat *w)
		1844	{
		1845	w->wd = inotify_add_watch (fs_fd, w->path, IN_ATTRIB | IN_DELETE_SELF | IN_MOVE_SELF | IN_MODIFY | IN_DONT_FOLLOW | IN_MASK_ADD);
		1846
		1847	if (w->wd < 0)
		1848	{
		1849	ev_timer_start (EV_A_ &w->timer); /* this is not race-free, so we still need to recheck periodically */
		1850
		1851	/* monitor some parent directory for speedup hints */
		1852	if ((errno == ENOENT || errno == EACCES) && strlen (w->path) < 4096)
		1853	{
		1854	char path [4096];
		1855	strcpy (path, w->path);
		1856
		1857	do
		1858	{
		1859	int mask = IN_MASK_ADD | IN_DELETE_SELF | IN_MOVE_SELF
		1860	| (errno == EACCES ? IN_ATTRIB : IN_CREATE | IN_MOVED_TO);
		1861
		1862	char *pend = strrchr (path, '/');
		1863
		1864	if (!pend)
		1865	break; /* whoops, no '/', complain to your admin */
		1866
		1867	*pend = 0;
		1868	w->wd = inotify_add_watch (fs_fd, path, mask);
		1869	}
		1870	while (w->wd < 0 && (errno == ENOENT || errno == EACCES));
		1871	}
		1872	}
		1873	else
		1874	ev_timer_stop (EV_A_ &w->timer); /* we can watch this in a race-free way */
		1875
		1876	if (w->wd >= 0)
		1877	wlist_add (&fs_hash [w->wd & (EV_INOTIFY_HASHSIZE - 1)].head, (WL)w);
		1878	}
		1879
		1880	static void noinline
		1881	infy_del (EV_P_ ev_stat *w)
		1882	{
		1883	int slot;
		1884	int wd = w->wd;
		1885
		1886	if (wd < 0)
		1887	return;
		1888
		1889	w->wd = -2;
		1890	slot = wd & (EV_INOTIFY_HASHSIZE - 1);
		1891	wlist_del (&fs_hash [slot].head, (WL)w);
		1892
		1893	/* remove this watcher, if others are watching it, they will rearm */
		1894	inotify_rm_watch (fs_fd, wd);
		1895	}
		1896
		1897	static void noinline
		1898	infy_wd (EV_P_ int slot, int wd, struct inotify_event *ev)
		1899	{
		1900	if (slot < 0)
		1901	/* overflow, need to check for all hahs slots */
		1902	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1903	infy_wd (EV_A_ slot, wd, ev);
		1904	else
		1905	{
		1906	WL w_;
		1907
		1908	for (w_ = fs_hash [slot & (EV_INOTIFY_HASHSIZE - 1)].head; w_; )
		1909	{
		1910	ev_stat *w = (ev_stat *)w_;
		1911	w_ = w_->next; /* lets us remove this watcher and all before it */
		1912
		1913	if (w->wd == wd || wd == -1)
		1914	{
		1915	if (ev->mask & (IN_IGNORED | IN_UNMOUNT | IN_DELETE_SELF))
		1916	{
		1917	w->wd = -1;
		1918	infy_add (EV_A_ w); /* re-add, no matter what */
		1919	}
		1920
		1921	stat_timer_cb (EV_A_ &w->timer, 0);
		1922	}
		1923	}
		1924	}
		1925	}
		1926
		1927	static void
		1928	infy_cb (EV_P_ ev_io *w, int revents)
		1929	{
		1930	char buf [EV_INOTIFY_BUFSIZE];
		1931	struct inotify_event *ev = (struct inotify_event *)buf;
		1932	int ofs;
		1933	int len = read (fs_fd, buf, sizeof (buf));
		1934
		1935	for (ofs = 0; ofs < len; ofs += sizeof (struct inotify_event) + ev->len)
		1936	infy_wd (EV_A_ ev->wd, ev->wd, ev);
		1937	}
		1938
		1939	void inline_size
		1940	infy_init (EV_P)
		1941	{
		1942	if (fs_fd != -2)
		1943	return;
		1944
		1945	fs_fd = inotify_init ();
		1946
		1947	if (fs_fd >= 0)
		1948	{
		1949	ev_io_init (&fs_w, infy_cb, fs_fd, EV_READ);
		1950	ev_set_priority (&fs_w, EV_MAXPRI);
		1951	ev_io_start (EV_A_ &fs_w);
		1952	}
		1953	}
		1954
		1955	void inline_size
		1956	infy_fork (EV_P)
		1957	{
		1958	int slot;
		1959
		1960	if (fs_fd < 0)
		1961	return;
		1962
		1963	close (fs_fd);
		1964	fs_fd = inotify_init ();
		1965
		1966	for (slot = 0; slot < EV_INOTIFY_HASHSIZE; ++slot)
		1967	{
		1968	WL w_ = fs_hash [slot].head;
		1969	fs_hash [slot].head = 0;
		1970
		1971	while (w_)
		1972	{
		1973	ev_stat *w = (ev_stat *)w_;
		1974	w_ = w_->next; /* lets us add this watcher */
		1975
		1976	w->wd = -1;
		1977
		1978	if (fs_fd >= 0)
		1979	infy_add (EV_A_ w); /* re-add, no matter what */
		1980	else
		1981	ev_timer_start (EV_A_ &w->timer);
		1982	}
		1983
		1984	}
		1985	}
		1986
		1987	#endif
		1988
		1989	void
		1990	ev_stat_stat (EV_P_ ev_stat *w)
		1991	{
		1992	if (lstat (w->path, &w->attr) < 0)
		1993	w->attr.st_nlink = 0;
		1994	else if (!w->attr.st_nlink)
		1995	w->attr.st_nlink = 1;
		1996	}
		1997
		1998	static void noinline
		1999	stat_timer_cb (EV_P_ ev_timer *w_, int revents)
		2000	{
		2001	ev_stat *w = (ev_stat *)(((char *)w_) - offsetof (ev_stat, timer));
		2002
		2003	/* we copy this here each the time so that */
		2004	/* prev has the old value when the callback gets invoked */
		2005	w->prev = w->attr;
		2006	ev_stat_stat (EV_A_ w);
		2007
		2008	/* memcmp doesn't work on netbsd, they.... do stuff to their struct stat */
		2009	if (
		2010	w->prev.st_dev != w->attr.st_dev
		2011	|| w->prev.st_ino != w->attr.st_ino
		2012	|| w->prev.st_mode != w->attr.st_mode
		2013	|| w->prev.st_nlink != w->attr.st_nlink
		2014	|| w->prev.st_uid != w->attr.st_uid
		2015	|| w->prev.st_gid != w->attr.st_gid
		2016	|| w->prev.st_rdev != w->attr.st_rdev
		2017	|| w->prev.st_size != w->attr.st_size
		2018	|| w->prev.st_atime != w->attr.st_atime
		2019	|| w->prev.st_mtime != w->attr.st_mtime
		2020	|| w->prev.st_ctime != w->attr.st_ctime
		2021	) {
		2022	#if EV_USE_INOTIFY
		2023	infy_del (EV_A_ w);
		2024	infy_add (EV_A_ w);
		2025	ev_stat_stat (EV_A_ w); /* avoid race... */
		2026	#endif
		2027
		2028	ev_feed_event (EV_A_ w, EV_STAT);
		2029	}
		2030	}
		2031
		2032	void
		2033	ev_stat_start (EV_P_ ev_stat *w)
		2034	{
		2035	if (expect_false (ev_is_active (w)))
		2036	return;
		2037
		2038	/* since we use memcmp, we need to clear any padding data etc. */
		2039	memset (&w->prev, 0, sizeof (ev_statdata));
		2040	memset (&w->attr, 0, sizeof (ev_statdata));
		2041
		2042	ev_stat_stat (EV_A_ w);
		2043
		2044	if (w->interval < MIN_STAT_INTERVAL)
		2045	w->interval = w->interval ? MIN_STAT_INTERVAL : DEF_STAT_INTERVAL;
		2046
		2047	ev_timer_init (&w->timer, stat_timer_cb, w->interval, w->interval);
		2048	ev_set_priority (&w->timer, ev_priority (w));
		2049
		2050	#if EV_USE_INOTIFY
		2051	infy_init (EV_A);
		2052
		2053	if (fs_fd >= 0)
		2054	infy_add (EV_A_ w);
		2055	else
		2056	#endif
		2057	ev_timer_start (EV_A_ &w->timer);
		2058
		2059	ev_start (EV_A_ (W)w, 1);
		2060	}
		2061
		2062	void
		2063	ev_stat_stop (EV_P_ ev_stat *w)
		2064	{
		2065	clear_pending (EV_A_ (W)w);
		2066	if (expect_false (!ev_is_active (w)))
		2067	return;
		2068
		2069	#if EV_USE_INOTIFY
		2070	infy_del (EV_A_ w);
		2071	#endif
		2072	ev_timer_stop (EV_A_ &w->timer);
		2073
		2074	ev_stop (EV_A_ (W)w);
		2075	}
		2076	#endif
		2077
		2078	#if EV_IDLE_ENABLE
		2079	void
		2080	ev_idle_start (EV_P_ ev_idle *w)
		2081	{
		2082	if (expect_false (ev_is_active (w)))
		2083	return;
		2084
		2085	pri_adjust (EV_A_ (W)w);
		2086
		2087	{
		2088	int active = ++idlecnt [ABSPRI (w)];
		2089
		2090	++idleall;
		2091	ev_start (EV_A_ (W)w, active);
		2092
		2093	array_needsize (ev_idle *, idles [ABSPRI (w)], idlemax [ABSPRI (w)], active, EMPTY2);
		2094	idles [ABSPRI (w)][active - 1] = w;
		2095	}
		2096	}
		2097
		2098	void
		2099	ev_idle_stop (EV_P_ ev_idle *w)
		2100	{
		2101	clear_pending (EV_A_ (W)w);
		2102	if (expect_false (!ev_is_active (w)))
		2103	return;
		2104
		2105	{
		2106	int active = ((W)w)->active;
		2107
		2108	idles [ABSPRI (w)][active - 1] = idles [ABSPRI (w)][--idlecnt [ABSPRI (w)]];
		2109	((W)idles [ABSPRI (w)][active - 1])->active = active;
		2110
		2111	ev_stop (EV_A_ (W)w);
		2112	--idleall;
		2113	}
		2114	}
		2115	#endif
		2116
		2117	void
		2118	ev_prepare_start (EV_P_ ev_prepare *w)
		2119	{
		2120	if (expect_false (ev_is_active (w)))
		2121	return;
		2122
		2123	ev_start (EV_A_ (W)w, ++preparecnt);
		2124	array_needsize (ev_prepare *, prepares, preparemax, preparecnt, EMPTY2);
		2125	prepares [preparecnt - 1] = w;
		2126	}
		2127
		2128	void
		2129	ev_prepare_stop (EV_P_ ev_prepare *w)
		2130	{
		2131	clear_pending (EV_A_ (W)w);
		2132	if (expect_false (!ev_is_active (w)))
		2133	return;
		2134
		2135	{
		2136	int active = ((W)w)->active;
		2137	prepares [active - 1] = prepares [--preparecnt];
		2138	((W)prepares [active - 1])->active = active;
		2139	}
		2140
		2141	ev_stop (EV_A_ (W)w);
		2142	}
		2143
		2144	void
		2145	ev_check_start (EV_P_ ev_check *w)
		2146	{
		2147	if (expect_false (ev_is_active (w)))
		2148	return;
		2149
		2150	ev_start (EV_A_ (W)w, ++checkcnt);
		2151	array_needsize (ev_check *, checks, checkmax, checkcnt, EMPTY2);
		2152	checks [checkcnt - 1] = w;
		2153	}
		2154
		2155	void
		2156	ev_check_stop (EV_P_ ev_check *w)
		2157	{
		2158	clear_pending (EV_A_ (W)w);
		2159	if (expect_false (!ev_is_active (w)))
		2160	return;
		2161
		2162	{
		2163	int active = ((W)w)->active;
		2164	checks [active - 1] = checks [--checkcnt];
		2165	((W)checks [active - 1])->active = active;
		2166	}
		2167
		2168	ev_stop (EV_A_ (W)w);
		2169	}
		2170
		2171	#if EV_EMBED_ENABLE
		2172	void noinline
		2173	ev_embed_sweep (EV_P_ ev_embed *w)
		2174	{
		2175	ev_loop (w->loop, EVLOOP_NONBLOCK);
		2176	}
		2177
		2178	static void
		2179	embed_cb (EV_P_ ev_io *io, int revents)
		2180	{
		2181	ev_embed *w = (ev_embed *)(((char *)io) - offsetof (ev_embed, io));
		2182
		2183	if (ev_cb (w))
		2184	ev_feed_event (EV_A_ (W)w, EV_EMBED);
		2185	else
		2186	ev_embed_sweep (loop, w);
		2187	}
		2188
		2189	void
		2190	ev_embed_start (EV_P_ ev_embed *w)
		2191	{
		2192	if (expect_false (ev_is_active (w)))
		2193	return;
		2194
		2195	{
		2196	struct ev_loop *loop = w->loop;
		2197	assert (("loop to be embedded is not embeddable", backend & ev_embeddable_backends ()));
		2198	ev_io_init (&w->io, embed_cb, backend_fd, EV_READ);
		2199	}
		2200
		2201	ev_set_priority (&w->io, ev_priority (w));
		2202	ev_io_start (EV_A_ &w->io);
		2203
		2204	ev_start (EV_A_ (W)w, 1);
		2205	}
		2206
		2207	void
		2208	ev_embed_stop (EV_P_ ev_embed *w)
		2209	{
		2210	clear_pending (EV_A_ (W)w);
		2211	if (expect_false (!ev_is_active (w)))
		2212	return;
		2213
		2214	ev_io_stop (EV_A_ &w->io);
		2215
		2216	ev_stop (EV_A_ (W)w);
		2217	}
		2218	#endif
		2219
		2220	#if EV_FORK_ENABLE
		2221	void
		2222	ev_fork_start (EV_P_ ev_fork *w)
		2223	{
		2224	if (expect_false (ev_is_active (w)))
		2225	return;
		2226
		2227	ev_start (EV_A_ (W)w, ++forkcnt);
		2228	array_needsize (ev_fork *, forks, forkmax, forkcnt, EMPTY2);
		2229	forks [forkcnt - 1] = w;
		2230	}
		2231
		2232	void
		2233	ev_fork_stop (EV_P_ ev_fork *w)
		2234	{
		2235	clear_pending (EV_A_ (W)w);
		2236	if (expect_false (!ev_is_active (w)))
		2237	return;
		2238
		2239	{
		2240	int active = ((W)w)->active;
		2241	forks [active - 1] = forks [--forkcnt];
		2242	((W)forks [active - 1])->active = active;
		2243	}
		2244
		2245	ev_stop (EV_A_ (W)w);
		2246	}
		2247	#endif
		2248
641	/*****************************************************************************/	2249	/*****************************************************************************/
642	#if 1	2250
		2251	struct ev_once
		2252	{
		2253	ev_io io;
		2254	ev_timer to;
		2255	void (*cb)(int revents, void *arg);
		2256	void *arg;
		2257	};
643		2258
644	static void	2259	static void
645	sin_cb (struct ev_io *w, int revents)	2260	once_cb (EV_P_ struct ev_once *once, int revents)
646	{	2261	{
647	fprintf (stderr, "sin %d, revents %d\n", w->fd, revents);	2262	void (*cb)(int revents, void *arg) = once->cb;
		2263	void *arg = once->arg;
		2264
		2265	ev_io_stop (EV_A_ &once->io);
		2266	ev_timer_stop (EV_A_ &once->to);
		2267	ev_free (once);
		2268
		2269	cb (revents, arg);
648	}	2270	}
649		2271
650	static void	2272	static void
651	ocb (struct ev_timer *w, int revents)	2273	once_cb_io (EV_P_ ev_io *w, int revents)
652	{	2274	{
653	//fprintf (stderr, "timer %f,%f (%x) (%f) d%p\n", w->at, w->repeat, revents, w->at - ev_time (), w->data);	2275	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, io)), revents);
654	evtimer_stop (w);
655	evtimer_start (w);
656	}	2276	}
657		2277
658	static void	2278	static void
659	scb (struct ev_signal *w, int revents)	2279	once_cb_to (EV_P_ ev_timer *w, int revents)
660	{	2280	{
661	fprintf (stderr, "signal %x,%d\n", revents, w->signum);	2281	once_cb (EV_A_ (struct ev_once *)(((char *)w) - offsetof (struct ev_once, to)), revents);
662	}	2282	}
663		2283
664	int main (void)	2284	void
		2285	ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg)
665	{	2286	{
666	struct ev_io sin;	2287	struct ev_once *once = (struct ev_once *)ev_malloc (sizeof (struct ev_once));
667		2288
668	ev_init (0);	2289	if (expect_false (!once))
669
670	evw_init (&sin, sin_cb, 55);
671	evio_set (&sin, 0, EV_READ);
672	evio_start (&sin);
673
674	struct ev_timer t[10000];
675
676	#if 0
677	int i;
678	for (i = 0; i < 10000; ++i)
679	{
680	struct ev_timer *w = t + i;
681	evw_init (w, ocb, i);
682	evtimer_set_abs (w, drand48 (), 0.99775533);
683	evtimer_start (w);
684	if (drand48 () < 0.5)
685	evtimer_stop (w);
686	}	2290	{
687	#endif	2291	cb (EV_ERROR | EV_READ | EV_WRITE | EV_TIMEOUT, arg);
688
689	struct ev_timer t1;
690	evw_init (&t1, ocb, 0);
691	evtimer_set_abs (&t1, 5, 10);
692	evtimer_start (&t1);
693
694	struct ev_signal sig;
695	evw_init (&sig, scb, 65535);
696	evsignal_set (&sig, SIGQUIT);
697	evsignal_start (&sig);
698
699	ev_loop (0);
700
701	return 0;	2292	return;
702	}	2293	}
703		2294
704	#endif	2295	once->cb = cb;
		2296	once->arg = arg;
705		2297
		2298	ev_init (&once->io, once_cb_io);
		2299	if (fd >= 0)
		2300	{
		2301	ev_io_set (&once->io, fd, events);
		2302	ev_io_start (EV_A_ &once->io);
		2303	}
706		2304
		2305	ev_init (&once->to, once_cb_to);
		2306	if (timeout >= 0.)
		2307	{
		2308	ev_timer_set (&once->to, timeout, 0.);
		2309	ev_timer_start (EV_A_ &once->to);
		2310	}
		2311	}
707		2312
		2313	#ifdef __cplusplus
		2314	}
		2315	#endif
708		2316

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