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Annotation of q_a/samples/bpointer/readme.txt, revision 1.1.1.1

1.1       root        1: Sample: Bpointer
                      2: 
                      3: When several processes need to access shared data, there is no guarantee
                      4: that the shared memory is mapped to the same locations in both processes.
                      5: This can cause a problem when the data contains relative pointers because
                      6: a pointer value that is valid in one processe's context may not be valid
                      7: in the context of the other processes.
                      8: 
                      9: This sample demonstrates the use of based pointers to allow manipulation of
                     10: shared data from several processes using memory mapped files. This
                     11: technique is applicable to all forms of shared memory.
                     12: 
                     13: It contains the following modules:
                     14: 
                     15: 
                     16: readdata.exe : A console process that allows you to view the shared data;
                     17:                it dereferences pointers as it encounters them.
                     18: chgdata.exe : A console process that lets you add elements to a shared
                     19:               linked list.
                     20: 
                     21: 
                     22: Note, however, that based pointers cut down on the performance of the
                     23: application using it because the pointers need to be resolved at runtime;
                     24: that is, each access typically adds one machine instruction overhead when
                     25: dereferencing a pointer.
                     26: 
                     27: Once the files are compiled, execute chgdata.exe and follow the
                     28: instructions posted there.
                     29: 
                     30: 

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