This week in my operating system class, we learned about Semaphores and the common concurrency problems that can occur in programs. We discussed three types of bugs that can arise: Non-Deadlock Bugs, Order-Violation Bugs, and Deadlock Bugs. Non-Deadlock Bugs occur when there is no deadlock, but the program does not behave as expected due to a synchronization error. Order-Violation Bugs occur when the order of execution is not what was intended, causing the program to behave incorrectly. Deadlock Bugs occur when two or more threads or processes are blocked, waiting for each other to release resources, causing the program to stop.
To mitigate these issues, we learned how Semaphores can be used to manage the access to shared resources by multiple threads or processes. Semaphores are synchronization primitives that can be used to control access to shared resources by enforcing mutual exclusion. They work by controlling access to a shared resource using a counter variable. We learned that Semaphores can be used to implement various synchronization mechanisms such as locks, condition variables, and barriers. Overall, understanding the use of Semaphores can help prevent these common concurrency bugs and ensure the correct behavior of programs that run concurrently.
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