Description
The 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.
The macro ATOMIC_FLAG_INIT may be
used to initialize an atomic_flag to the clear
state. An 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 atomic_flag type.
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