Library /sys$common/syshlp/dbg$help.hlb DEBUG, SET, EVENT_FACILITY, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The current event facility (ADA, THREADS, or SCAN) defines the
    eventpoints that you can set with the SET BREAK/EVENT and SET
    TRACE/EVENT commands.

    When started with a program that is linked with an event
    facility, the debugger automatically sets the facility in a
    manner appropriate for the type of program. For example, if the
    main program is written in Ada or SCAN, the event facility is set
    to ADA or SCAN, respectively.

    The SET EVENT_FACILITY command enables you to change the event
    facility and thereby change your debugging context. This is
    useful if you have a multilanguage program and want to debug
    a routine that is associated with an event facility but that
    facility is not currently set.

    On VAX processors, you cannot use both Ada and POSIX Threads
    tasking services in the same program. This implies that you can
    change the event facility only from ADA to SCAN or from POSIX
    Threads to SCAN, or conversely.

    Use the SHOW EVENT_FACILITY command to identify the event
    names associated with the current event facility. These are the
    keywords that you can specify with the (SET,CANCEL) BREAK/EVENT
    and (SET,CANCEL) TRACE/EVENT commands.

    Related commands:

       (SET,CANCEL) BREAK/EVENT
       (SET,CANCEL) TRACE/EVENT
       SHOW BREAK
       SHOW EVENT_FACILITY
       SHOW IMAGE
       SHOW TASK
       SHOW TRACE