From 9d49d51a85f86f516427e337e77a60bf8bd8edf1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20Gl=C3=B6ckner?= <cgloeckner@freenet.de>
Date: Wed, 23 Mar 2016 22:40:27 +0100
Subject: atomic workaround
---
src/atomic.h | 105 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 105 insertions(+)
create mode 100644 src/atomic.h
(limited to 'src')
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 Gl�ckner
+ * 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;
+};
--
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