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19771202_Mesa_Language_Working_Group_Minutes


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                                       XEROX
                                    BUSINESS SYSTEMS
                                 System Development Division
                                      December 2, 1977                  XEROX SDD ARCHIVES
                                                                    I have read and understood
To: Mesa Language Working Group                                    Pages_________ To _________
                                                                 Reviewer                Date
From:   Dick Sweet
                                                                 {I of Pages
                                                                                              ----
                                                                                       Ref .,t.1UJIf~; (;
Subject: Mesa Language Working Group minutes

The Language Working Group met on 23 November, 1977.

The discussion of object style monitors continued. A new type of procedure was proposed.
An INTERNAL PROCEDURE is a non-entry one that is called only when the monitor lock is,
held. For object style monitors, each INTERNAL procedure must begin with the same obi
parameter as must each ENTRY procedure.

WAIT, NOTIFY, and BROADCAST are allowed only from within an          ENTRY     or an   INTERNAL
procedure. Is this also true for non object style?

A new type, LOCK, will exist with only one public field,   priority. Thus we no longer need
MONITORED RECORDS, only ones with a LOCK in them.          Likewise, CONDITION types have a
private field, timeout.

The discussion of long pointers began. One question was what sort of flavors of the
monitor stuff to do for various shaped pointers. There were 3 options.

        1. Only   LONG POINTER   forms.
        2. Short flavors for some or all.
        3. Routines could take either. If they are done with a minimal stack, the interpreter
        could use the stack size to determine whether the arguments are long or short.



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