bricks: ATOMIC_FLAG_INIT initialization
From the working draft: "The macro ATOMIC_FLAG_INIT shall be defined in such a way that it can be used to initialize an object of type atomic_flag to the clear state. The macro can be used in the form: atomic_flag guard = ATOMIC_FLAG_INIT; It is unspecified whether the macro can be used in other initialization contexts." * bricks/brick-shmem.h: here.
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