Return to readme CVS log

Up to [WindowsNT SDKs] / q_a / samples / readwrit

Annotation of q_a/samples/readwrit/readme, revision 1.1.1.1

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: 

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.