(_stepping_threads): New member.
        * classpath/lib/gnu/classpath/jdwp/VMVirtualMachine.class:
        Regenerated.
        * gnu/classpath/jdwp/VMVirtualMachine.h:
        Regenerated.
        * gnu/claspath/jdwp/natVMVirtualMachine.cc
        (get_request_step_filter): New function.
        (DISABLE_EVENT): New macro.
        (initialize): Initialize _stepping_threads.
        (registerEvent): Implement EVENT_SINGLE_STEP.
        (unregisterEvent): Likewise.

From-SVN: r121769