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Suppose that you have two UNIX threads that are writing to the same file's data blocks. Why would it be more efficient for concurrency control
Suppose that you have two UNIX threads that are writing to the same file's data blocks. Why would it be more efficient for concurrency control between these two threads to be implemented on the block-writes by the file system, rather than application-level semaphores? Why would the file system not be able to enforce such concurrency control if the file is memory-mapped? Why might file system concurrency control be insufficient for the application requirements?
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