assume that a multithreaded application uses only reader writer locks for syncronization
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Reader-writer locks are used to allow multiple readers to access a resource simultaneously while ensuring that writers have exclusive access. Here’s a step-by-step explanation: Show more…
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Consider a system with four mutual exclusion locks (A, B, C, and D) and a readers/writers lock (E). Suppose the programmer follows these rules: Processing for each request is divided into two parts. During the first part, no lock may be released, and if E is held in writing mode, it cannot be downgraded to reading mode. Furthermore, lock A may not be acquired if any of locks B, C, D, or E are held in any mode. Lock B may not be acquired if any of locks C, D, or E are held in any mode. Lock C may not be acquired if any of locks D or E are held in any mode. Lock D may not be acquired if lock E is held in any mode. Lock E may always be acquired in read mode or write mode, and it can be upgraded from read to write mode but not downgraded from write to read mode. During the second part, any lock may be released, and lock E may be downgraded from write mode to read mode; releases and downgrades can happen in any order. By the end of part 2, all locks must be released, and no locks may be acquired or upgraded. Do these rules ensure serializability? Do they ensure freedom from deadlock? Why?
Akash M.
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