All access to POSIX shared memory requires a system call.

Name: All access to POSIX shared memory requires a system call.
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Access to POSIX shared memory after it has been mapped into a process's address space does not require a system call for every access. Reads and writes to the shared memory can be done directly through memory operations. System calls are required for creating, mapping, and unlinking the shared memory object, but not for the actual data access once it is mapped.

All Access to POSIX Shared Memory Requires a System Call