Presents multiplex pattern allowing limited concurrent threads and barrier synchronization for n threads. Shows how semaphores initialized to n control simultaneous access and how barriers force threads to wait until all arrive at checkpoint.
Explores mutual exclusion using semaphores to protect shared variables. Introduces the mutex pattern where semaphores initialized to 1 enforce exclusive access to critical sections, preventing concurrent access to shared resources through wait/signal mechanisms.
Covers queue synchronization using semaphores with exclusive queue patterns. Explains leader-follower synchronization where paired threads must dance together, using counters, mutexes, and rendezvous semaphores to enforce concurrent pairing constraints.
Introduces fundamental synchronization patterns including signaling and rendezvous. Demonstrates how semaphores solve serialization problems by enabling one thread to send signals indicating completion, allowing guaranteed event ordering in concurrent execution.
Discusses advantages of using semaphores for synchronization: deliberate constraint enforcement, clean organized solutions, and efficient portable implementations across systems. Explores alternative naming conventions (V/P operations) from Dijkstra’s original design.