Limiting number of concurrent theads execution in pthreads?

Create a queue where you put the new jobs. Create 5 threads. Each thread will pick one job and process it, then it will pick the next job.

Once the queue is empty the threads can exit and you can do thread_join. You'll need synchronization for the queue (or array).

In main initialize a semaphore with an initial value of 4. Inside the BusyWork function, each thread should wait on the semaphore upon entry, and then post upon exit. Once you have joined all your threads, destroy the semaphore.

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