RtlBackoff

__int64 __fastcall RtlBackoff(unsigned int *a1){
  unsigned int v1; 
  __int64 result; 
  unsigned __int64 v3; 
  unsigned int v4; 

  v1 = *a1;
  if( *a1 )
  {
    if( v1 < 0x1FFF )
      v1 *= 2;
  }
  else
  {
    result = (unsigned int)KeNumberProcessors_0;
    if( (_DWORD)KeNumberProcessors_0 == 1 )
      return result;
    v1 = 64;
  }
  *a1 = v1;
  v3 = __rdtsc();
  v4 = 0;
  result = 10 * (((v1 - 1) & (unsigned int)v3) + v1) / KUSER_SHARED_DATA.CyclesPerYield;
  if( (_DWORD)result )
  {
    do
    {
      _mm_pause();
      ++v4;
    }
    while( v4 < (unsigned int)result );
  }
  return result;
}

Referenced by: