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Aucbvax.4932 fa.unix-wizards utzoo!decvax!ucbvax!unix-wizards Tue Nov 3 00:33:25 1981 Shared data >From cbosg!dale@Berkeley Tue Nov 3 00:22:04 1981 About a year and a half ago Alan Hewett in Columbus BTL implemented a form of shared memory in UNIX which permitted a user process to attach any segment of any regular UNIX file to it's address space. This was done with complete locking built in: file segments could be attached read, read/write, readonly, exclusive write, etc. Interlocking with simultaneous "normal" read/write access was also provided. The hooks necessary to support such a "feature" were extensive, and somewhat ugly, however. It was implimented by actually mapping selected system buffers into a user's precess space.

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