From d7bd511c703664b388724c61e4eea764eaaeb045 Mon Sep 17 00:00:00 2001
From: Henrik Stickann <4376396-Mithradir@users.noreply.gitlab.com>
Date: Sat, 9 Apr 2022 21:23:02 +0200
Subject: [PATCH] Add mutex implementation using std::atomic_flag

---
 include/sta/atomic_mutex.hpp | 25 +++++++++++++++++++++++++
 src/atomic_mutex.cpp         | 19 +++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 include/sta/atomic_mutex.hpp
 create mode 100644 src/atomic_mutex.cpp

diff --git a/include/sta/atomic_mutex.hpp b/include/sta/atomic_mutex.hpp
new file mode 100644
index 0000000..39d2cf9
--- /dev/null
+++ b/include/sta/atomic_mutex.hpp
@@ -0,0 +1,25 @@
+#ifndef STA_ATOMIC_MUTEX_HPP
+#define STA_ATOMIC_MUTEX_HPP
+
+#include <sta/mutex.hpp>
+
+#include <atomic>
+
+
+namespace sta
+{
+	class AtomicMutex : public Mutex
+	{
+	public:
+		AtomicMutex();
+
+		void acquire() override;
+		void release() override;
+
+	private:
+		std::atomic_flag lock_;
+	};
+} // namespace sta
+
+
+#endif // STA_ATOMIC_MUTEX_HPP
diff --git a/src/atomic_mutex.cpp b/src/atomic_mutex.cpp
new file mode 100644
index 0000000..87b9be3
--- /dev/null
+++ b/src/atomic_mutex.cpp
@@ -0,0 +1,19 @@
+#include <sta/atomic_mutex.hpp>
+
+
+namespace sta
+{
+	AtomicMutex::AtomicMutex()
+		: lock_{ATOMIC_FLAG_INIT}
+	{}
+
+	void AtomicMutex::acquire()
+	{
+		while (lock_.test_and_set());
+	}
+
+	void AtomicMutex::release()
+	{
+		lock_.clear();
+	}
+} // namespace sta