atomic_thread_fence()

Arguments:

order

The memory_order to use for the fence.

Library:

• If the atomic function is lock-free (see atomic_is_lock_free()), no extra library is required.
• If the function isn't lock-free, you need to link against libatomic. Use the -l atomic option to qcc to link against this library.

Description:

The atomic_thread_fence() function establishes a memory-synchronization ordering of non-atomic and relaxed atomic accesses, as instructed by order, without an associated atomic operation.

The implementation of atomic functions may depend on the architecture. For more information, see LL/SC vs LSE atomic operations in the description in Building Embedded Systems of the cpuinfo area of the system page.

Classification:

C11

Caveats:

If this function is lock-free (see atomic_is_lock_free()), it's safe to call it from a signal handler.