CST334: Week 6 Journal

     This week i learned about semaphores. Semaphores are atomic operations that allow processes to synchronize.  Semaphores can encounter non-deadlock bugs such as atomicity-violation bugs and order violation bugs. Atomicity can be solved by creating a lock around shared variable references, while order violation bugs can be enforced using condition variables. They can also encounter various deadlock bugs. Circular wait deadlocks can be prevented via a total ordering on lock acquisition. Hold-and-wait deadlocks can be prevented by acquiring all locks at once. Deadlocks can be avoided via scheduling if global knowledge of what multiple threads may grab during their execution. 

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