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