The atomic_flag type provides the classic test-and-set functionality.
atomic_flag type provides the classic test-and-set functionality.
It has two states, set (value is non-zero) and clear (value is 0).
Operations on an object of type
atomic_flag shall be lock free.
ATOMIC_FLAG_INIT may be used to initialize an
atomic_flag to the clear state.
atomic_flag that is not explicitly initialized with
ATOMIC_FLAG_INIT is initially in an indeterminate state.
This macro can only be used for atomic objects that are declared in program scope in the global address space with the
global atomic_flag guard = ATOMIC_FLAG_INIT;