diff options
| author | PHO <pho@cielonegro.org> | 2015-01-26 14:54:16 +0900 |
|---|---|---|
| committer | Max Kellermann <max@duempel.org> | 2015-01-29 08:33:48 +0100 |
| commit | a4f4fc50b9e1c825806dc7dc44ac8eb4398a3a5b (patch) | |
| tree | d8abfdb8c81c2c6428e33cb6c71ecebf247c0266 | |
| parent | ad1b6ef0ac5e7c869b6adbede153e8b2ac55d708 (diff) | |
Avoid integer overflow in MonotonicClock{S,MS,US}
This is Darwin specific: the previous implementation was causing an integer
overflow when base.numer is very large. On PPC Darwin, the timebase info is 1000000000/33330116 and this is too large for integer arithmetic.
| -rw-r--r-- | NEWS | 1 | ||||
| -rw-r--r-- | src/system/Clock.cxx | 8 |
2 files changed, 5 insertions, 4 deletions
@@ -1,5 +1,6 @@ ver 0.18.23 (not yet released) * despotify: remove defunct plugin +* fix clock integer overflow on OS X * fix gcc 5.0 warnings ver 0.18.22 (2014/01/14) diff --git a/src/system/Clock.cxx b/src/system/Clock.cxx index 347997a44..916bda56c 100644 --- a/src/system/Clock.cxx +++ b/src/system/Clock.cxx @@ -40,8 +40,8 @@ MonotonicClockMS(void) if (base.denom == 0) (void)mach_timebase_info(&base); - return (unsigned)((mach_absolute_time() * base.numer) - / (1000000 * base.denom)); + return (unsigned)(((double)mach_absolute_time() * base.numer) + / base.denom / 1000000); #elif defined(CLOCK_MONOTONIC) struct timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts); @@ -82,8 +82,8 @@ MonotonicClockUS(void) if (base.denom == 0) (void)mach_timebase_info(&base); - return ((uint64_t)mach_absolute_time() * (uint64_t)base.numer) - / (1000 * (uint64_t)base.denom); + return (uint64_t)(((double)mach_absolute_time() * base.numer) + / base.denom / 1000); #elif defined(CLOCK_MONOTONIC) struct timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts); |