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Annotation of q_a/samples/readwrit/readme, revision 1.1

1.1     ! root        1:  Sample: Read/Write Synchronization Demonstration
        !             2: 
        !             3: Summary:
        !             4: 
        !             5: This article refers to the file DATABASE.C, a part of the
        !             6: READWRIT sample, which is one variation of the classical
        !             7: synchronization problem Reader/Writers. The Reader/Writer
        !             8: problem first stated and solved by Courtois revolves around
        !             9: a shared resource which is typically a database. The issue
        !            10: here is to allow both readers and writers access to the
        !            11: database without corrupting it.
        !            12: 
        !            13: More Information:
        !            14: 
        !            15: Typically one allows multiple readers to access the database
        !            16: as long as a writer is not accessing it. However, when a
        !            17: Writer is accessing the database no other Readers or Writers
        !            18: are allowed access. There are several variations of this
        !            19: problem around. The simplest will favor readers to the
        !            20: exclusion of writers or visa versa.
        !            21: 
        !            22: The implementation used by the READWRIT sample allows as
        !            23: many readers in the database at one time until a writer
        !            24: wished entrance in. Then no other reader can enter the
        !            25: database until this writer is finished. All readers
        !            26: currently in the database, however, can finish. This way no
        !            27: starvation of either the readers or writers which is
        !            28: inherent in the simpler methods will happen.
        !            29: 
        !            30: In order to keep this sample focused,the user interface is
        !            31: very simple; to run this sample at the command prompt type:
        !            32: 
        !            33:    READWRIT
        !            34: 
        !            35: What you will see are the values the readers put on the
        !            36: screen. These are the running total of the threads that
        !            37: wrote to the database.
        !            38: 
        !            39: 
        !            40: 

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