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developerWorks: Use Shared Objects on Linux

May 13, 2004, 05:30 (3 Talkback[s])
(Other stories by Sachin O. Agrawal)


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"In terms of time and space, shared memory is probably the most efficient inter-process communication channel provided by all modern operating systems. Shared memory is simultaneously mapped to the address space of more than one process: a process simply attaches to the shared memory and starts communicating with other processes by using it as it would use ordinary memory.

"However, in the object-oriented programming world, processes prefer to share objects rather than raw information. With objects, there is no need to serialize, transport, and de-serialize the information contained within the object. Shared objects also reside in shared memory, and although such objects 'belong' to the process that created them, all processes on the system can access them. Hence, all of the information within a shared object should be strictly process-neutral..."

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