atomic workaround

1 files changed, 105 insertions, 0 deletions

diff --git a/src/atomic.h b/src/atomic.h
new file mode 100644
index 0000000..11c87fc
--- /dev/null
+++ b/src/atomic.h
@@ -0,0 +1,105 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ *            atomic.h
+ *
+ *  Wed Mar 23 09:15:05 CET 2016
+ *  Copyright 2016 Christian Glöckner
+ *  cgloeckner@freenet.de
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#pragma once
+
+#include <type_traits>
+#include <atomic>
+#include <mutex>
+
+template <typename T, typename = void>
+class Atomic;
+
+// use std::atomic if possible
+template <typename T>
+class Atomic<T, typename std::enable_if<std::is_trivially_copyable<T>::value>::type>
+	: public std::atomic<T> {
+};
+
+// else work around it using a mutex
+template <typename T>
+class Atomic<T, typename std::enable_if<!std::is_trivially_copyable<T>::value>::type> {
+	public:
+		using self_type = Atomic<T, typename std::enable_if<!std::is_trivially_copyable<T>::value>::type>;
+
+		Atomic()
+			: data{}
+			, mutex{} {
+		}
+
+		Atomic(T data)
+			: data{std::move(data)}
+			, mutex{} {
+		}
+
+		Atomic(self_type const & other)
+			: data{}
+			, mutex{} {
+			std::lock_guard<std::mutex> lock{other.mutex};
+			data = other.data;
+		}
+
+		Atomic(self_type&& other)
+			: data{}
+			, mutex{} {
+			std::lock_guard<std::mutex> lock{other.mutex};
+			std::swap(data, other.data);
+		}
+
+		T operator=(T data) {
+			std::lock_guard<std::mutex> lock{mutex};
+			this->data = std::move(data);
+			return this->data;
+		}
+
+		operator T() const {
+			return load();
+		}
+
+		bool is_lock_free() const {
+			return false;
+		}
+
+		void store(T data) {
+			std::lock_guard<std::mutex> lock{mutex};
+			this->data = std::move(data);
+		}
+
+		T load() const {
+			std::lock_guard<std::mutex> lock{mutex};
+			return data;
+		}
+
+		T exchange(T data){
+			std::lock_guard<std::mutex> lock{mutex};
+			std::swap(data, this->data);
+			return data;
+		}
+
+	private:
+		T data;
+		mutable std::mutex mutex;
+};