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Merge branch 'maint-0.4.5' into maint-0.4.7

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This commit is contained in:
David Goulet 2022-10-14 09:12:23 -04:00
commit e86833ade6
2 changed files with 13 additions and 4 deletions
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6
changes/bug40684 Normal file
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@ -0,0 +1,6 @@
o Major bugfixes (OSX):
- Fix coarse-time computation on Apple platforms (like Mac M1) where
the Mach absolute time ticks do not correspond directly to
nanoseconds. Previously, we computed our shift value wrong, which
led us to give incorrect timing results.
Fixes bug 40684; bugfix on 0.3.3.1-alpha.

11
src/lib/time/compat_time.c
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@ -253,11 +253,14 @@ monotime_init_internal(void)
tor_assert(mach_time_info.denom != 0);
{
// approximate only.
uint64_t ns_per_tick = mach_time_info.numer / mach_time_info.denom;
uint64_t ms_per_tick = ns_per_tick * ONE_MILLION;
// We want to compute this, approximately:
// uint64_t ns_per_tick = mach_time_info.numer / mach_time_info.denom;
// uint64_t ticks_per_ms = ONE_MILLION / ns_per_tick;
// This calculation multiplies first, though, to improve accuracy.
uint64_t ticks_per_ms = (ONE_MILLION * mach_time_info.denom)
/ mach_time_info.numer;
// requires that tor_log2(0) == 0.
monotime_shift = tor_log2(ms_per_tick);
monotime_shift = tor_log2(ticks_per_ms);
}
{
// For converting ticks to milliseconds in a 32-bit-friendly way, we