Question: Create a semaphore named FLAG which the threads will use to manage access to the file STACK.txt. Create 4 threads. Use the POSIX version of

Create a semaphore named FLAG which the threads will use to manage access to the file STACK.txt.

Create 4 threads. Use the POSIX version of threads (i.e., pthread_create())

Block/wait for all four threads to complete their work.

Once all threads are done, destroy the semaphore, then exit printing a message to the console

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