From 2e9f64a045b05e93e5a5584a49dbc916e20af55c Mon Sep 17 00:00:00 2001
From: Henrik Stickann <4376396-Mithradir@users.noreply.gitlab.com>
Date: Sat, 9 Apr 2022 21:21:21 +0200
Subject: [PATCH] Add mutex interface

---
 include/sta/mutex.hpp | 27 +++++++++++++++++++++++++++
 src/mutex.cpp         | 20 ++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 include/sta/mutex.hpp
 create mode 100644 src/mutex.cpp

diff --git a/include/sta/mutex.hpp b/include/sta/mutex.hpp
new file mode 100644
index 0000000..a9869de
--- /dev/null
+++ b/include/sta/mutex.hpp
@@ -0,0 +1,27 @@
+#ifndef STA_MUTEX_HPP
+#define STA_MUTEX_HPP
+
+
+namespace sta
+{
+	/**
+	 * @brief Interface for mutex objects.
+	 */
+	class Mutex
+	{
+	public:
+		/**
+		 * @brief Block until mutex has been acquired
+		 */
+		virtual void acquire() = 0;
+		/**
+		 * @brief Release mutex
+		 */
+		virtual void release() = 0;
+
+		static Mutex * ALWAYS_FREE; /**< Fake mutex that can always be acquired */
+	};
+} // namespace sta
+
+
+#endif // STA_MUTEX_HPP
diff --git a/src/mutex.cpp b/src/mutex.cpp
new file mode 100644
index 0000000..b861ebd
--- /dev/null
+++ b/src/mutex.cpp
@@ -0,0 +1,20 @@
+#include <sta/mutex.hpp>
+
+
+namespace sta
+{
+	/**
+	 * @brief Dummy mutex implementation with no access control.
+	 */
+	class DummyMutex : public Mutex
+	{
+	public:
+		void acquire() override {}
+		void release() override {}
+	};
+
+	static DummyMutex dummyMutex;
+
+
+	Mutex * Mutex::ALWAYS_FREE = &dummyMutex;
+} // namespace sta