AtomicBoolean.swift

class AtomicBoolean {

	private var val: Byte = 0

	/// Sets the value, and returns the previous value.
	/// The test/set is an atomic operation.
	func testAndSet(value: Bool) -> Bool {
		if value {
			return OSAtomicTestAndSet(0, &val)
		} else {
			return OSAtomicTestAndClear(0, &val)
		}
	}

	/// Returns the current value of the boolean.
	/// The value may change before this method returns.
	func test() -> Bool {
		return val != 0
	}

}