1 /* 2 * libjingle 3 * Copyright 2004--2005, Google Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 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. 15 * 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. 26 */ 27 28 #ifndef TALK_BASE_TIME_H__ 29 #define TALK_BASE_TIME_H__ 30 31 #ifndef WIN32 32 #include_next <time.h> 33 #endif 34 35 #include "talk/base/basictypes.h" 36 37 namespace talk_base { 38 39 typedef uint32 TimeStamp; 40 41 // Returns the current time in milliseconds. 42 uint32 Time(); 43 44 // Approximate time when the program started. 45 uint32 StartTime(); 46 47 // Returns a future timestamp, 'elapsed' milliseconds from now. 48 uint32 TimeAfter(int32 elapsed); 49 50 // Comparisons between time values, which can wrap around. 51 bool TimeIsBetween(uint32 earlier, uint32 middle, uint32 later); // Inclusive 52 bool TimeIsLaterOrEqual(uint32 earlier, uint32 later); // Inclusive 53 bool TimeIsLater(uint32 earlier, uint32 later); // Exclusive 54 55 // Returns the later of two timestamps. 56 inline uint32 TimeMax(uint32 ts1, uint32 ts2) { 57 return TimeIsLaterOrEqual(ts1, ts2) ? ts2 : ts1; 58 } 59 60 // Returns the earlier of two timestamps. 61 inline uint32 TimeMin(uint32 ts1, uint32 ts2) { 62 return TimeIsLaterOrEqual(ts1, ts2) ? ts1 : ts2; 63 } 64 65 // Number of milliseconds that would elapse between 'earlier' and 'later' 66 // timestamps. The value is negative if 'later' occurs before 'earlier'. 67 int32 TimeDiff(uint32 later, uint32 earlier); 68 69 // The number of milliseconds that have elapsed since 'earlier'. 70 inline int32 TimeSince(uint32 earlier) { 71 return TimeDiff(Time(), earlier); 72 } 73 74 // The number of milliseconds that will elapse between now and 'later'. 75 inline int32 TimeUntil(uint32 later) { 76 return TimeDiff(later, Time()); 77 } 78 79 } // namespace talk_base 80 81 #endif // TALK_BASE_TIME_H__ 82
