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Deadlock (Part 2) Deadlocks (Part 2) Deadlock Avoidance - The Demerits of the Deadlock Prevention: - It prevents deadlocks by limiting how requests can made, - ensuring that at least one of the necessary conditions cannot occur. - However, possible side effects of preventing deadlocks are - low device utilization and reduces system throughput. - Deadlock Avoidance - Let the system to decide for ..

Deadlock(Part 1) System Model - A deadlock is - a situation in which - every process in a set of processes is waiting for - an event that can be caused only by another process in the set. - an event that can be caused only by another process in the set. - a situation in which - a waiting thread (or process) can never again change state, - because theresources it has requested - are held by other..

Synchronization Tool(Part 4) Monitors - The difficulty of using semaphores: - The semaphore is convenient and effective for synchronization. - However, timing errors can happen - if particular execution sequences take place. - these sequences do not always occur, - and it is hard to detect. - An illustrative example of semaphores's problem - All processes share a binary semaphore mutex initializ..

Synchronization Tools(Part 3) Mutex Lock - Higher-level software tools to solve the CSP: - Mutex Locks: the simplest tools for synchronization. (2개) - Semaphore: more robust, convenient, and effective too. (n개) - Monitor: overcomes the demerits of mutex and semaphore. - Liveness: ensures for processes to make progress. - Mutex Lock - mutex: mutual exclusion. - to protect critical section and pre..