NAME
        LockRexxBase - Obtain a semaphore lock on the RexxBase structure

    SYNOPSIS
        LockRexxBase(resource)
                     D0

        VOID LockRexxBase(ULONG);

    FUNCTION
        Secures the specified resource in the ARexx library base.

    INPUTS
        resource - A manifest constant defining which resource to lock.
                   ZERO locks all resources.

    NOTES
        Currently, only ZERO resource type is available.  You *MUST* make
        sure that you do not call this function with an undefined value
        as it may become defined at some future date and cause unwanted
        behavior.

    SEE ALSO
        unlockrexxbase()

    BUGS