diff options
Diffstat (limited to 'zen/tick_count.h')
| -rw-r--r-- | zen/tick_count.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/zen/tick_count.h b/zen/tick_count.h index cb15fe20..482689d7 100644 --- a/zen/tick_count.h +++ b/zen/tick_count.h @@ -102,7 +102,7 @@ int64_t ticksPerSec() //return 0 on error #ifdef ZEN_WIN LARGE_INTEGER frequency = {}; if (!::QueryPerformanceFrequency(&frequency)) //MSDN promises: "The frequency cannot change while the system is running." - return 0; + return 0; //MSDN: "This won't occur on any system that runs Windows XP or later." static_assert(sizeof(int64_t) >= sizeof(frequency.QuadPart), ""); return frequency.QuadPart; @@ -126,8 +126,10 @@ TickVal getTicks() //return !isValid() on error { #ifdef ZEN_WIN LARGE_INTEGER now = {}; - if (!::QueryPerformanceCounter(&now)) //msdn: SetThreadAffinityMask() may be required if there are bugs in BIOS or HAL" + if (!::QueryPerformanceCounter(&now)) return TickVal(); + //detailed info about QPC: http://msdn.microsoft.com/en-us/library/windows/desktop/dn553408%28v=vs.85%29.aspx + //- MSDN: "No need to set the thread affinity" #elif defined ZEN_LINUX //gettimeofday() seems fine but is deprecated |