PsGetThreadExitStatus

NTSTATUS __stdcall PsGetThreadExitStatus(_ETHREAD *Thread){
  _EX_RUNDOWN_REF *p_RundownProtect; 

  p_RundownProtect = &Thread->RundownProtect;
  if( !ExAcquireRundownProtection(&Thread->RundownProtect) )
    return Thread->ExitStatus;
  ExReleaseRundownProtection(p_RundownProtect);
  return 259;
}

Referenced by:

NtQueryInformationThread