6.4.3 Semaphores Basic Concepts Internal Data Structures Kernel semid_ds structure Kernel sem structure SYSTEM CALL: semget() SYSTEM CALL: semop() SYSTEM CALL: semctl() semtool: An interactive semaphore manipulator Background Command Line Syntax Creating a Semaphore Set Locking a Semaphore Unlocking a Semaphore Changing the Permissions (mode) Deleting a Semaphore Set Examples The Source semstat: A semtool companion program

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