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| author | Victor Stinner <victor.stinner@gmail.com> | 2012-03-28 02:50:46 +0200 |
|---|---|---|
| committer | Victor Stinner <victor.stinner@gmail.com> | 2012-03-28 02:50:46 +0200 |
| commit | dcb1fc615b360eb4ee048a12af68ab8404b3bf2a (patch) | |
| tree | 83b1b980a13e9eb434a0ca03e7a4f5904ac3cfa9 /Modules/timemodule.c | |
| parent | 45f9ee09ef05b956f71db1bd716831e793a77b9c (diff) | |
| download | cpython-dcb1fc615b360eb4ee048a12af68ab8404b3bf2a.tar.gz | |
Document the fact that mach_timebase_info() cannot fail
And call mach_absolute_time() after mach_timebase_info().
Diffstat (limited to 'Modules/timemodule.c')
| -rw-r--r-- | Modules/timemodule.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/Modules/timemodule.c b/Modules/timemodule.c index b32c9df107..c99c0a934b 100644 --- a/Modules/timemodule.c +++ b/Modules/timemodule.c @@ -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); |