Question

Semaphores are used to solve.

• A. Deadlock
• B. Mutual exclusion
• C. Inter-process communication
• D. Messaging

Answer 1

Answer: (B)

Mutual exclusion

Semaphore is a variable or abstract data type used to control access to a common resource by multiple processes in a concurrent system like multitasking operating system.

Semaphores are used to solve a problem of race condition, mutual exclusion, process synchronization. There are some arguments semaphores does not gurantee freedom from race condition. Mutual exclusion is a program object that prevents simultaneous access to a shared resource. Semaphore used for signaling between threads.