Illustrate how a binary semaphore can be used to implement mutual exclusion among n processes.
时间: 2024-06-06 08:08:34 浏览: 21
To implement mutual exclusion among n processes using a binary semaphore, we can follow these steps:
1. Initialize a binary semaphore with an initial value of 1.
2. Before entering the critical section, a process must acquire the semaphore by calling the wait() function. This will decrement the semaphore value by 1, indicating that the critical section is occupied.
3. Once a process has finished executing its critical section, it must release the semaphore by calling the signal() function. This will increment the semaphore value by 1, indicating that the critical section is now available for another process to use.
4. If multiple processes attempt to acquire the semaphore at the same time, only one will be able to proceed into the critical section. The other processes will be blocked and will have to wait until the semaphore is released.
The use of a binary semaphore ensures that only one process is allowed to enter the critical section at a time, providing mutual exclusion among the n processes.