ExpGetThreadResourceHint

INT64 __fastcall ExpGetThreadResourceHint(INT64 a1){
  if( (a1 & 3) != 0 )
    return 0i64;
  else
    return *(unsigned __int8 *)(a1 + 649);
}

Referenced by:

ExAcquireSharedWaitForExclusive
ExpAcquireResourceSharedLite
ExpAcquireSharedStarveExclusive