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*Null (NL). Indicates interest in the resource, but does not prevent other processes from locking it. It has the advantage that the resource and its [[#Lock value block|lock value block]] are preserved, even when no processes are locking it.
*Concurrent Read (CR). Indicates a desire to read (but not update) the resource. It allows other processes to read or update the resource, but prevents others from having exclusive access to it. This is usually employed on high-level resources, in order that more restrictive locks can be obtained on subordinate resources.
*Concurrent Write (CW). Indicates a desire to read and update the resource. It also allows other processes to read or update the resource, but prevents others from having exclusive access to it. This is also usually employed on high-level resources, in order that more restrictive locks can be obtained on subordinate resources.
*Protected Read (PR). This is the traditional ''share lock'', which indicates a desire to read the resource but prevents other from updating it. Others can however also read the resource.
*Protected Write (PW). This is the traditional ''update lock'', which indicates a desire to read and update the resource and prevents others from updating it. Others with Concurrent Read access can however read the resource.
*Exclusive (EX). This is the traditional ''exclusive lock'' which allows read and update access to the resource, and prevents others from having any access to it.
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