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