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1 /* | |
2 * Copyright (C) 2006 Apple Computer, Inc. All rights reserved. | |
3 * Copyright (C) 2008 Google Inc. All rights reserved. | |
4 * | |
5 * Redistribution and use in source and binary forms, with or without | |
6 * modification, are permitted provided that the following conditions are | |
7 * met: | |
8 * | |
9 * * Redistributions of source code must retain the above copyright | |
10 * notice, this list of conditions and the following disclaimer. | |
11 * * Redistributions in binary form must reproduce the above | |
12 * copyright notice, this list of conditions and the following disclaimer | |
13 * in the documentation and/or other materials provided with the | |
14 * distribution. | |
15 * * Neither the name of Google Inc. nor the names of its | |
16 * contributors may be used to endorse or promote products derived from | |
17 * this software without specific prior written permission. | |
18 * | |
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
30 */ | |
31 | |
32 #ifndef CurrentTime_h | |
33 #define CurrentTime_h | |
34 | |
35 #include <time.h> | |
36 | |
37 namespace WTF { | |
38 | |
39 // Returns the current UTC time in seconds, counted from January 1, 1970. | |
40 // Precision varies depending on platform but is usually as good or better | |
41 // than a millisecond. | |
42 WTF_EXPORT_PRIVATE double currentTime(); | |
43 | |
44 // Same thing, in milliseconds. | |
45 inline double currentTimeMS() | |
46 { | |
47 return currentTime() * 1000.0; | |
48 } | |
49 | |
50 // Provides a monotonically increasing time in seconds since an arbitrary point
in the past. | |
51 // On unsupported platforms, this function only guarantees the result will be no
n-decreasing. | |
52 WTF_EXPORT_PRIVATE double monotonicallyIncreasingTime(); | |
53 | |
54 } // namespace WTF | |
55 | |
56 using WTF::currentTime; | |
57 using WTF::currentTimeMS; | |
58 using WTF::monotonicallyIncreasingTime; | |
59 | |
60 #endif // CurrentTime_h | |
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