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Document the fact that mach_timebase_info() cannot fail

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And call mach_absolute_time() after mach_timebase_info().
This commit is contained in:
Victor Stinner 2012-03-28 02:50:46 +02:00
parent 650365b163
commit 74eb6c0e8b
1 changed files with 8 additions and 4 deletions
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12
Modules/timemodule.c
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@ -768,13 +768,17 @@ steady_clock(int strict)
#if defined(MS_WINDOWS) && !defined(__BORLANDC__)
return win32_clock(!strict);
#elif defined(__APPLE__)
uint64_t time = mach_absolute_time();
static mach_timebase_info_data_t timebase;
uint64_t time;
double secs;
static mach_timebase_info_data_t timebase;
if (timebase.denom == 0)
mach_timebase_info(&timebase);
if (timebase.denom == 0) {
/* According to the Technical Q&A QA1398, mach_timebase_info() cannot
fail: https://developer.apple.com/library/mac/#qa/qa1398/ */
(void)mach_timebase_info(&timebase);
}
time = mach_absolute_time();
secs = (double)time * timebase.numer / timebase.denom * 1e-9;
return PyFloat_FromDouble(secs);