a9890800e0
https://webrtc-codereview.appspot.com/5309005/. R=mallinath@webrtc.org, niklas.enbom@webrtc.org Review URL: https://webrtc-codereview.appspot.com/5719004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@5277 4adac7df-926f-26a2-2b94-8c16560cd09d
103 lines
3.8 KiB
C++
103 lines
3.8 KiB
C++
/*
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* libjingle
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* Copyright 2005 Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_BASE_TIMEUTILS_H_
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#define TALK_BASE_TIMEUTILS_H_
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#include <time.h>
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#include "talk/base/basictypes.h"
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namespace talk_base {
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static const int64 kNumMillisecsPerSec = INT64_C(1000);
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static const int64 kNumMicrosecsPerSec = INT64_C(1000000);
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static const int64 kNumNanosecsPerSec = INT64_C(1000000000);
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static const int64 kNumMicrosecsPerMillisec = kNumMicrosecsPerSec /
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kNumMillisecsPerSec;
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static const int64 kNumNanosecsPerMillisec = kNumNanosecsPerSec /
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kNumMillisecsPerSec;
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static const int64 kNumNanosecsPerMicrosec = kNumNanosecsPerSec /
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kNumMicrosecsPerSec;
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// January 1970, in NTP milliseconds.
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static const int64 kJan1970AsNtpMillisecs = INT64_C(2208988800000);
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typedef uint32 TimeStamp;
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// Returns the current time in milliseconds.
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uint32 Time();
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// Returns the current time in microseconds.
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uint64 TimeMicros();
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// Returns the current time in nanoseconds.
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uint64 TimeNanos();
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// Stores current time in *tm and microseconds in *microseconds.
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void CurrentTmTime(struct tm *tm, int *microseconds);
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// Returns a future timestamp, 'elapsed' milliseconds from now.
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uint32 TimeAfter(int32 elapsed);
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// Comparisons between time values, which can wrap around.
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bool TimeIsBetween(uint32 earlier, uint32 middle, uint32 later); // Inclusive
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bool TimeIsLaterOrEqual(uint32 earlier, uint32 later); // Inclusive
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bool TimeIsLater(uint32 earlier, uint32 later); // Exclusive
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// Returns the later of two timestamps.
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inline uint32 TimeMax(uint32 ts1, uint32 ts2) {
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return TimeIsLaterOrEqual(ts1, ts2) ? ts2 : ts1;
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}
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// Returns the earlier of two timestamps.
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inline uint32 TimeMin(uint32 ts1, uint32 ts2) {
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return TimeIsLaterOrEqual(ts1, ts2) ? ts1 : ts2;
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}
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// Number of milliseconds that would elapse between 'earlier' and 'later'
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// timestamps. The value is negative if 'later' occurs before 'earlier'.
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int32 TimeDiff(uint32 later, uint32 earlier);
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// The number of milliseconds that have elapsed since 'earlier'.
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inline int32 TimeSince(uint32 earlier) {
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return TimeDiff(Time(), earlier);
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}
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// The number of milliseconds that will elapse between now and 'later'.
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inline int32 TimeUntil(uint32 later) {
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return TimeDiff(later, Time());
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}
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// Converts a unix timestamp in nanoseconds to an NTP timestamp in ms.
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inline int64 UnixTimestampNanosecsToNtpMillisecs(int64 unix_ts_ns) {
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return unix_ts_ns / kNumNanosecsPerMillisec + kJan1970AsNtpMillisecs;
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}
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} // namespace talk_base
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#endif // TALK_BASE_TIMEUTILS_H_
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