diff options
Diffstat (limited to 'base/time_posix.cc')
| -rw-r--r-- | base/time_posix.cc | 42 |
1 files changed, 21 insertions, 21 deletions
diff --git a/base/time_posix.cc b/base/time_posix.cc index 894d1af..6885cad 100644 --- a/base/time_posix.cc +++ b/base/time_posix.cc @@ -129,27 +129,27 @@ TimeTicks TimeTicks::Now() { static mach_timebase_info_data_t timebase_info; if (timebase_info.denom == 0) { // Zero-initialization of statics guarantees that denom will be 0 before - // calling mach_timebase_info. mach_timebase_info will never set denom to - // 0 as that would be invalid, so the zero-check can be used to determine - // whether mach_timebase_info has already been called. This is - // recommended by Apple's QA1398. - kern_return_t kr = mach_timebase_info(&timebase_info); - DCHECK(kr == KERN_SUCCESS); - } - - // mach_absolute_time is it when it comes to ticks on the Mac. Other calls - // with less precision (such as TickCount) just call through to - // mach_absolute_time. - - // timebase_info converts absolute time tick units into nanoseconds. Convert - // to microseconds up front to stave off overflows. - absolute_micro = mach_absolute_time() / Time::kNanosecondsPerMicrosecond * - timebase_info.numer / timebase_info.denom; - - // Don't bother with the rollover handling that the Windows version does. - // With numer and denom = 1 (the expected case), the 64-bit absolute time - // reported in nanoseconds is enough to last nearly 585 years. - + // calling mach_timebase_info. mach_timebase_info will never set denom to + // 0 as that would be invalid, so the zero-check can be used to determine + // whether mach_timebase_info has already been called. This is + // recommended by Apple's QA1398. + kern_return_t kr = mach_timebase_info(&timebase_info); + DCHECK(kr == KERN_SUCCESS); + } + + // mach_absolute_time is it when it comes to ticks on the Mac. Other calls + // with less precision (such as TickCount) just call through to + // mach_absolute_time. + + // timebase_info converts absolute time tick units into nanoseconds. Convert + // to microseconds up front to stave off overflows. + absolute_micro = mach_absolute_time() / Time::kNanosecondsPerMicrosecond * + timebase_info.numer / timebase_info.denom; + + // Don't bother with the rollover handling that the Windows version does. + // With numer and denom = 1 (the expected case), the 64-bit absolute time + // reported in nanoseconds is enough to last nearly 585 years. + #elif defined(OS_POSIX) && \ defined(_POSIX_MONOTONIC_CLOCK) && _POSIX_MONOTONIC_CLOCK >= 0 |