# LOCK-files (.LCK)

(Appendix 31).

Added lock files when importing and exporting mail (same filename, extension added or replaced = "lck")

    This means that while FBB is using MAIL.IN a file named MAIL.LCK exists.
    In the same way, if a file named MAIL.LCK exists, FBB will delay MAIL.IN
    This is to avoid conflicts between applications.

    MAIL.LCK is not imported, it is only a (empty) temporary file which is used
    as a flag.

    When FBB imports MAIL.IN it does :

    if MAIL.LCK exists
    then begin
        do not import MAIL.IN
        if MAIL.LCK is older than one hour
        then begin
            delete (if possible) MAIL.LCK
        end
    end
    else begin
        create MAIL.LCK
        import MAIL.IN
        delete MAIL.LCK
    end

    this is checked every minute until MAIL.LCK no longer exist.

    When FBB exports LA6CU.OUT, it does :

    if LA6CU.LCK exists
    then begin
        do not export LA6CU.OUT
        if LA6CU.LCK is older than one hour
        then begin
            delete (if possible) LA6CU.LCK
        end
    end
    else begin
        create LA6CU.LCK
        export LA6CU.OUT
        delete LA6CU.LCK
    end

    Another application should do the same to avoid conflicts.

    Lock-files are deleted (if possible) after 1 hour.

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