_LOCK_OPERATION

Windows 10 1607 Redstone 1 (Anniversary Update) x86
Windows 10 1703 Redstone 2 (Creators Update) x86
Windows 10 1709 Redstone 3 (Fall Creators Update) x86
//0x4 bytes (sizeof)
enum _LOCK_OPERATION
{
    IoReadAccess = 0,
    IoWriteAccess = 1,
    IoModifyAccess = 2
};