Add atomic signal implementation

include/sta/atomic_signal.hpp

@@ -0,0 +1,27 @@
+#ifndef STA_ATOMIC_SIGNAL_HPP
+#define STA_ATOMIC_SIGNAL_HPP
+
+#include <sta/signal.hpp>
+
+#include <atomic>
+
+
+namespace sta
+{
+	class AtomicSignal : public Signal
+	{
+	public:
+		AtomicSignal();
+
+		void notify() override;
+		bool peek() override;
+		bool test() override;
+		void wait() override;
+
+	private:
+		std::atomic<bool> signal_;
+	};
+} // namespace sta
+
+
+#endif // STA_ATOMIC_SIGNAL_HPP

src/atomic_signal.cpp

@@ -0,0 +1,29 @@
+#include <sta/atomic_signal.hpp>
+
+
+namespace sta
+{
+	AtomicSignal::AtomicSignal()
+		: signal_{false}
+	{}
+
+	void AtomicSignal::notify()
+	{
+		signal_.store(true);
+	}
+
+	bool AtomicSignal::peek()
+	{
+		return signal_.load();
+	}
+
+	bool AtomicSignal::test()
+	{
+		return signal_.exchange(false);
+	}
+
+	void AtomicSignal::wait()
+	{
+		while (!signal_.exchange(false));
+	}
+} // namespace sta