time-internal.h revision 285612 
1/*
2 * Copyright (c) 2000-2007 Niels Provos <provos@citi.umich.edu>
3 * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 *    derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27#ifndef TIME_INTERNAL_H_INCLUDED_
28#define TIME_INTERNAL_H_INCLUDED_
29
30#include "event2/event-config.h"
31#include "evconfig-private.h"
32
33#ifdef EVENT__HAVE_MACH_MACH_TIME_H
34/* For mach_timebase_info */
35#include <mach/mach_time.h>
36#endif
37
38#include <time.h>
39
40#include "event2/util.h"
41
42#ifdef __cplusplus
43extern "C" {
44#endif
45
46#if defined(EVENT__HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC)
47#define HAVE_POSIX_MONOTONIC
48#elif defined(EVENT__HAVE_MACH_ABSOLUTE_TIME)
49#define HAVE_MACH_MONOTONIC
50#elif defined(_WIN32)
51#define HAVE_WIN32_MONOTONIC
52#else
53#define HAVE_FALLBACK_MONOTONIC
54#endif
55
56long evutil_tv_to_msec_(const struct timeval *tv);
57void evutil_usleep_(const struct timeval *tv);
58
59#ifdef _WIN32
60typedef ULONGLONG (WINAPI *ev_GetTickCount_func)(void);
61#endif
62
63struct evutil_monotonic_timer {
64
65#ifdef HAVE_MACH_MONOTONIC
66	struct mach_timebase_info mach_timebase_units;
67#endif
68
69#ifdef HAVE_POSIX_MONOTONIC
70	int monotonic_clock;
71#endif
72
73#ifdef HAVE_WIN32_MONOTONIC
74	ev_GetTickCount_func GetTickCount64_fn;
75	ev_GetTickCount_func GetTickCount_fn;
76	ev_uint64_t last_tick_count;
77	ev_uint64_t adjust_tick_count;
78
79	ev_uint64_t first_tick;
80	ev_uint64_t first_counter;
81	double usec_per_count;
82	int use_performance_counter;
83#endif
84
85	struct timeval adjust_monotonic_clock;
86	struct timeval last_time;
87};
88
89int evutil_configure_monotonic_time_(struct evutil_monotonic_timer *mt,
90    int flags);
91int evutil_gettime_monotonic_(struct evutil_monotonic_timer *mt, struct timeval *tv);
92
93
94#ifdef __cplusplus
95}
96#endif
97
98#endif /* EVENT_INTERNAL_H_INCLUDED_ */
99