C++ (Cpp) ClockResolutionNsの例

コード例 #1

ファイル: TimeStamp_darwin.cpp プロジェクト: abhishekvp/gecko-dev

nsresult
TimeStamp::Startup()
{
  if (gInitialized)
    return NS_OK;

  mach_timebase_info_data_t timebaseInfo;
  // Apple's QA1398 suggests that the output from mach_timebase_info
  // will not change while a program is running, so it should be safe
  // to cache the result.
  kern_return_t kr = mach_timebase_info(&timebaseInfo);
  if (kr != KERN_SUCCESS)
    NS_RUNTIMEABORT("mach_timebase_info failed");

  sNsPerTick = double(timebaseInfo.numer) / timebaseInfo.denom;

  sResolution = ClockResolutionNs();

  // find the number of significant digits in sResolution, for the
  // sake of ToSecondsSigDigits()
  for (sResolutionSigDigs = 1;
       !(sResolutionSigDigs == sResolution
         || 10*sResolutionSigDigs > sResolution);
       sResolutionSigDigs *= 10);

  gInitialized = true;

  return NS_OK;
}

コード例 #2

ファイル: TimeStamp_posix.cpp プロジェクト: excitedhoney/firefox

nsresult
TimeStamp::Startup()
{
  if (gInitialized)
    return NS_OK;

  struct timespec dummy;
  if (0 != clock_gettime(CLOCK_MONOTONIC, &dummy))
      NS_RUNTIMEABORT("CLOCK_MONOTONIC is absent!");

  sResolution = ClockResolutionNs();

  // find the number of significant digits in sResolution, for the
  // sake of ToSecondsSigDigits()
  for (sResolutionSigDigs = 1;
       !(sResolutionSigDigs == sResolution
         || 10*sResolutionSigDigs > sResolution);
       sResolutionSigDigs *= 10);

  gInitialized = true;
  sFirstTimeStamp = TimeStamp::Now();
  sProcessCreation = TimeStamp();

  return NS_OK;
}