Document the fact that mach_timebase_info() cannot fail
And call mach_absolute_time() after mach_timebase_info().
diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index b32c9df..c99c0a9 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -768,13 +768,17 @@
#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);