... College. I used the first edition of The Little Book of Semaphoresalong with one of the standard textbooks, and I taught Synchronization as aconcurrent thread for the duration of the course. Each ... -4.When the 5th thread signals the barrier, one of the waiting threads is allowedto proceed, and the semaphore is incremented to -3.But then no one signals the semaphore again and none of the other ... al-lowed.At any time, the value of the semaphore represents the number of additionalthreads that may enter. If the value is zero, then the next thread will blockuntil one of the threads inside...