Mutex and Semaphores

• This is a tool for solving Critical Section Problem.
• It provides Mutual exclusion.
• This is a locking Mechanism, used to synchronize access to a resource.
• Only 1 task acquires the mutex and that task only can release the mutex (lock).
• At any point of time, only one thread can work on entire buffer.
• It protects critical regions and hence prevents race around condition, that is , a process must acquire a lock before entering a critical section.
• This lock is released when a process when a process exits critical section.
• There are 2 function to this -
  • Acquire - To acquire the lock
  • Release - To release the lock after critical section code is finished execution.

Acquire Definition -

Release Definition -