3
* Copyright 2005 Google Inc.
5
* Redistribution and use in source and binary forms, with or without
6
* modification, are permitted provided that the following conditions are met:
8
* 1. Redistributions of source code must retain the above copyright notice,
9
* this list of conditions and the following disclaimer.
10
* 2. Redistributions in binary form must reproduce the above copyright notice,
11
* this list of conditions and the following disclaimer in the documentation
12
* 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.
16
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
#ifndef TALK_BASE_TIMEUTILS_H_
29
#define TALK_BASE_TIMEUTILS_H_
35
#include "talk/base/basictypes.h"
39
static const int64 kNumMillisecsPerSec = 1000;
40
static const int64 kNumMicrosecsPerSec = 1000000;
41
static const int64 kNumNanosecsPerSec = 1000000000;
43
static const int64 kNumMicrosecsPerMillisec = kNumMicrosecsPerSec /
45
static const int64 kNumNanosecsPerMillisec = kNumNanosecsPerSec /
48
typedef uint32 TimeStamp;
50
// Returns the current time in milliseconds.
52
// Returns the current time in nanoseconds.
55
// Returns a future timestamp, 'elapsed' milliseconds from now.
56
uint32 TimeAfter(int32 elapsed);
58
// Comparisons between time values, which can wrap around.
59
bool TimeIsBetween(uint32 earlier, uint32 middle, uint32 later); // Inclusive
60
bool TimeIsLaterOrEqual(uint32 earlier, uint32 later); // Inclusive
61
bool TimeIsLater(uint32 earlier, uint32 later); // Exclusive
63
// Returns the later of two timestamps.
64
inline uint32 TimeMax(uint32 ts1, uint32 ts2) {
65
return TimeIsLaterOrEqual(ts1, ts2) ? ts2 : ts1;
68
// Returns the earlier of two timestamps.
69
inline uint32 TimeMin(uint32 ts1, uint32 ts2) {
70
return TimeIsLaterOrEqual(ts1, ts2) ? ts1 : ts2;
73
// Number of milliseconds that would elapse between 'earlier' and 'later'
74
// timestamps. The value is negative if 'later' occurs before 'earlier'.
75
int32 TimeDiff(uint32 later, uint32 earlier);
77
// The number of milliseconds that have elapsed since 'earlier'.
78
inline int32 TimeSince(uint32 earlier) {
79
return TimeDiff(Time(), earlier);
82
// The number of milliseconds that will elapse between now and 'later'.
83
inline int32 TimeUntil(uint32 later) {
84
return TimeDiff(later, Time());
87
} // namespace talk_base
89
#endif // TALK_BASE_TIMEUTILS_H_