diff options
| author | PHO <pho@cielonegro.org> | 2015-01-26 14:54:16 +0900 |
|---|---|---|
| committer | Max Kellermann <max@duempel.org> | 2015-01-29 08:34:37 +0100 |
| commit | 39abd3ecb493c2a12dd08a31042dce07664642d2 (patch) | |
| tree | b3517eddb3a7414275c924a52eb6b2b1c525d5fe /src/system | |
| parent | 7bf638b0deedf02aea46e72f6f3c848e86f2ce0d (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.
Diffstat (limited to 'src/system')
| -rw-r--r-- | src/system/Clock.cxx | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/src/system/Clock.cxx b/src/system/Clock.cxx index 9baa0c0ca..c2f5e5087 100644 --- a/src/system/Clock.cxx +++ b/src/system/Clock.cxx @@ -40,8 +40,8 @@ MonotonicClockS(void) if (base.denom == 0) (void)mach_timebase_info(&base); - return (unsigned)((mach_absolute_time() * base.numer / 1000) - / (1000000 * base.denom)); + return (unsigned)(((double)mach_absolute_time() * base.numer / 1000) + / base.denom / 1000000); #elif defined(CLOCK_MONOTONIC) struct timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts); @@ -62,8 +62,8 @@ 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); @@ -104,8 +104,8 @@ 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); |