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
43 extern "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 
56 long evutil_tv_to_msec_(const struct timeval *tv);
57 EVENT2_EXPORT_SYMBOL
58 void evutil_usleep_(const struct timeval *tv);
59 
60 #ifdef _WIN32
61 typedef ULONGLONG (WINAPI *ev_GetTickCount_func)(void);
62 #endif
63 
64 struct evutil_monotonic_timer {
65 
66 #ifdef HAVE_MACH_MONOTONIC
67 	struct mach_timebase_info mach_timebase_units;
68 #endif
69 
70 #ifdef HAVE_POSIX_MONOTONIC
71 	int monotonic_clock;
72 #endif
73 
74 #ifdef HAVE_WIN32_MONOTONIC
75 	ev_GetTickCount_func GetTickCount64_fn;
76 	ev_GetTickCount_func GetTickCount_fn;
77 	ev_uint64_t last_tick_count;
78 	ev_uint64_t adjust_tick_count;
79 
80 	ev_uint64_t first_tick;
81 	ev_uint64_t first_counter;
82 	double usec_per_count;
83 	int use_performance_counter;
84 #endif
85 
86 	struct timeval adjust_monotonic_clock;
87 	struct timeval last_time;
88 };
89 
90 EVENT2_EXPORT_SYMBOL
91 int evutil_configure_monotonic_time_(struct evutil_monotonic_timer *mt,
92     int flags);
93 EVENT2_EXPORT_SYMBOL
94 int evutil_gettime_monotonic_(struct evutil_monotonic_timer *mt, struct timeval *tv);
95 
96 
97 #ifdef __cplusplus
98 }
99 #endif
100 
101 #endif /* EVENT_INTERNAL_H_INCLUDED_ */
102