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I’m trying to build a client server application using POSIX shared memory and POSIX semaphores. Do I have to place the semaphores inside the shared memory segment or can the semaphores just be global variables? I wish to adhere to POSIX convention.
No, the semaphores are system resources; you don’t have to worry about locating them.
Update: Let me “extend and revise my remarks”. Named semaphores are system resources. Unnamed semaphores must be in a shared memory segment. See the intro man page for semaphores.