ExAcquireSpinLockExclusiveAtDpcLevel

INT8 __fastcall ExAcquireSpinLockExclusiveAtDpcLevel(INT64 *a1){
  signed __int32 i; 
  int v3; 
  bool v4; 
  signed __int32 v5; 
  UINT64 SpinCount; 

  LODWORD(SpinCount) = 0;
  if( _interlockedbittestandset((volatile signed __int32 *)a1, 0x1Fu) )
  {
    v3 = ExpWaitForSpinLockExclusiveAndAcquire(a1, 0xFFu);
    LODWORD(SpinCount) = v3;
  }
  for( i = *(_DWORD *)a1; (i & 0xBFFFFFFF) != 0x80000000; LOBYTE(v3) = i )
  {
    if( (i & 0x40000000) == 0 )
    {
      v5 = _InterlockedCompareExchange((volatile signed __int32 *)a1, i | 0x40000000, i);
      v4 = i == v5;
      i = v5;
      if( !v4 )
        continue;
    }
    KeYieldProcessorEx(&SpinCount);
    i = *(_DWORD *)a1;
  }
  return v3;
}

Referenced by: