POSIX Semaphores

POSIX semaphores are tools used in programming to coordinate access to shared resources, like files or data in a system. Think of them as signaling mechanisms that help multiple processes or threads take turns safely, preventing conflicts or errors. For example, a semaphore might keep track of how many available tickets in a virtual queue, allowing only that many processes to access a resource simultaneously. When a process finishes, it signals the semaphore to let others know the resource is free. This ensures smooth, organized, and safe operation in multi-tasking environments.