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comparison: ipc/chromium/src/base/time_mac.cc
ipc/chromium/src/base/time_mac.cc
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| 1 // Copyright (c) 2008 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "base/time.h" | |
| 6 | |
| 7 #include <CoreFoundation/CFDate.h> | |
| 8 #include <CoreFoundation/CFTimeZone.h> | |
| 9 #include <mach/mach_time.h> | |
| 10 #include <sys/time.h> | |
| 11 #include <time.h> | |
| 12 | |
| 13 #include "base/basictypes.h" | |
| 14 #include "base/logging.h" | |
| 15 #include "base/scoped_cftyperef.h" | |
| 16 | |
| 17 namespace base { | |
| 18 | |
| 19 // The Time routines in this file use Mach and CoreFoundation APIs, since the | |
| 20 // POSIX definition of time_t in Mac OS X wraps around after 2038--and | |
| 21 // there are already cookie expiration dates, etc., past that time out in | |
| 22 // the field. Using CFDate prevents that problem, and using mach_absolute_time | |
| 23 // for TimeTicks gives us nice high-resolution interval timing. | |
| 24 | |
| 25 // Time ----------------------------------------------------------------------- | |
| 26 | |
| 27 // The internal representation of Time uses a 64-bit microsecond count | |
| 28 // from 1970-01-01 00:00:00 UTC. Core Foundation uses a double second count | |
| 29 // since 2001-01-01 00:00:00 UTC. | |
| 30 | |
| 31 // Some functions in time.cc use time_t directly, so we provide a zero offset | |
| 32 // for them. The epoch is 1970-01-01 00:00:00 UTC. | |
| 33 // static | |
| 34 const int64_t Time::kTimeTToMicrosecondsOffset = GG_INT64_C(0); | |
| 35 | |
| 36 // static | |
| 37 Time Time::Now() { | |
| 38 CFAbsoluteTime now = | |
| 39 CFAbsoluteTimeGetCurrent() + kCFAbsoluteTimeIntervalSince1970; | |
| 40 return Time(static_cast<int64_t>(now * kMicrosecondsPerSecond)); | |
| 41 } | |
| 42 | |
| 43 // static | |
| 44 Time Time::NowFromSystemTime() { | |
| 45 // Just use Now() because Now() returns the system time. | |
| 46 return Now(); | |
| 47 } | |
| 48 | |
| 49 // static | |
| 50 Time Time::FromExploded(bool is_local, const Exploded& exploded) { | |
| 51 CFGregorianDate date; | |
| 52 date.second = exploded.second + | |
| 53 exploded.millisecond / static_cast<double>(kMillisecondsPerSecond); | |
| 54 date.minute = exploded.minute; | |
| 55 date.hour = exploded.hour; | |
| 56 date.day = exploded.day_of_month; | |
| 57 date.month = exploded.month; | |
| 58 date.year = exploded.year; | |
| 59 | |
| 60 scoped_cftyperef<CFTimeZoneRef> | |
| 61 time_zone(is_local ? CFTimeZoneCopySystem() : NULL); | |
| 62 CFAbsoluteTime seconds = CFGregorianDateGetAbsoluteTime(date, time_zone) + | |
| 63 kCFAbsoluteTimeIntervalSince1970; | |
| 64 return Time(static_cast<int64_t>(seconds * kMicrosecondsPerSecond)); | |
| 65 } | |
| 66 | |
| 67 void Time::Explode(bool is_local, Exploded* exploded) const { | |
| 68 CFAbsoluteTime seconds = | |
| 69 (static_cast<double>(us_) / kMicrosecondsPerSecond) - | |
| 70 kCFAbsoluteTimeIntervalSince1970; | |
| 71 | |
| 72 scoped_cftyperef<CFTimeZoneRef> | |
| 73 time_zone(is_local ? CFTimeZoneCopySystem() : NULL); | |
| 74 CFGregorianDate date = CFAbsoluteTimeGetGregorianDate(seconds, time_zone); | |
| 75 | |
| 76 exploded->year = date.year; | |
| 77 exploded->month = date.month; | |
| 78 exploded->day_of_month = date.day; | |
| 79 exploded->hour = date.hour; | |
| 80 exploded->minute = date.minute; | |
| 81 exploded->second = date.second; | |
| 82 exploded->millisecond = | |
| 83 static_cast<int>(date.second * kMillisecondsPerSecond) % | |
| 84 kMillisecondsPerSecond; | |
| 85 } | |
| 86 | |
| 87 // TimeTicks ------------------------------------------------------------------ | |
| 88 | |
| 89 // static | |
| 90 TimeTicks TimeTicks::Now() { | |
| 91 uint64_t absolute_micro; | |
| 92 | |
| 93 static mach_timebase_info_data_t timebase_info; | |
| 94 if (timebase_info.denom == 0) { | |
| 95 // Zero-initialization of statics guarantees that denom will be 0 before | |
| 96 // calling mach_timebase_info. mach_timebase_info will never set denom to | |
| 97 // 0 as that would be invalid, so the zero-check can be used to determine | |
| 98 // whether mach_timebase_info has already been called. This is | |
| 99 // recommended by Apple's QA1398. | |
| 100 kern_return_t kr = mach_timebase_info(&timebase_info); | |
| 101 DCHECK(kr == KERN_SUCCESS); | |
| 102 } | |
| 103 | |
| 104 // mach_absolute_time is it when it comes to ticks on the Mac. Other calls | |
| 105 // with less precision (such as TickCount) just call through to | |
| 106 // mach_absolute_time. | |
| 107 | |
| 108 // timebase_info converts absolute time tick units into nanoseconds. Convert | |
| 109 // to microseconds up front to stave off overflows. | |
| 110 absolute_micro = mach_absolute_time() / Time::kNanosecondsPerMicrosecond * | |
| 111 timebase_info.numer / timebase_info.denom; | |
| 112 | |
| 113 // Don't bother with the rollover handling that the Windows version does. | |
| 114 // With numer and denom = 1 (the expected case), the 64-bit absolute time | |
| 115 // reported in nanoseconds is enough to last nearly 585 years. | |
| 116 | |
| 117 return TimeTicks(absolute_micro); | |
| 118 } | |
| 119 | |
| 120 // static | |
| 121 TimeTicks TimeTicks::HighResNow() { | |
| 122 return Now(); | |
| 123 } | |
| 124 | |
| 125 } // namespace base |
