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Adding a high-resolution timer to platform win32.

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BUG=None

Review URL: https://codereview.chromium.org/10867057
Patch from Sergey Rogulenko <rogulenko@google.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12651 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
jkummerow@chromium.org 2012-10-02 10:59:44 +00:00
parent ecc7f4baad
commit bdc466422b
1 changed files with 12 additions and 1 deletions
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13
src/platform-win32.cc
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@ -591,8 +591,16 @@ double OS::TimeCurrentMillis() {
return t.ToJSTime();
}
// Returns the tickcounter based on timeGetTime.
static LARGE_INTEGER frequency = 0;
// Returns the tickcounter based on QueryPerformanceCounter or timeGetTime.
int64_t OS::Ticks() {
static LARGE_INTEGER tick;
if (frequency != 0 && QueryPerformanceCounter(&tick)) {
return static_cast<int64_t>(tick.QuadPart * 1e6 / frequency->QuadPart);
}
return timeGetTime() * 1000; // Convert to microseconds.
}
@ -2087,12 +2095,15 @@ void OS::SetUp() {
// call this setup code within the same millisecond.
uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis());
srand(static_cast<unsigned int>(seed));
// Get the number of ticks per second that is used in OS::Ticks()
QueryPerformanceFrequency(&frequency);
limit_mutex = CreateMutex();
SamplerThread::SetUp();
}
void OS::TearDown() {
frequency = 0;
SamplerThread::TearDown();
delete limit_mutex;
}