NAME
    LockLayerInfo -- Lock the LayerInfo structure.

SYNOPSIS
    LockLayerInfo( li )
                   a0

    void LockLayerInfo( struct Layer_Info *);

FUNCTION
    Before doing an operation that requires the LayerInfo
    structure, make sure that no other task is also using the
    LayerInfo structure.  LockLayerInfo() returns when the
    LayerInfo belongs to this task.  There should be
    an UnlockLayerInfo for every LockLayerInfo.

    Note: All layer routines presently LockLayerInfo() when they
    start up and UnlockLayerInfo() as they exit.  Programmers
    will need to use these Lock/Unlock routines if they wish
    to do something with the LayerStructure that is not
    supported by the layer library.

INPUTS
    li - pointer to Layer_Info structure

BUGS

SEE ALSO
    UnlockLayerInfo, graphics/layers.h