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High Quality Content by WIKIPEDIA articles! In computer science, a semaphore is a protected variable or abstract data type which constitutes a classic method of controlling access by several processes to a common resource in a parallel programming environment. A semaphore generally takes one of two forms: binary and counting. A binary semaphore is a simple "true/false" (locked/unlocked) flag that controls access to a single resource. A counting semaphore is a counter for a set of available resources. Either semaphore type may be employed to prevent a race condition. On the other hand, a semaphore is of no value in preventing resource deadlock, such as illustrated by the dining philosophers problem.