From 3ecca5323cba595fa05a599777f0b4c455bdd058 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20Gl=C3=B6ckner?= <cgloeckner@freenet.de>
Date: Thu, 31 Mar 2016 10:09:40 +0200
Subject: Added API for accessing structs in a thread-safe way
---
src/syncedsettings.h | 112 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 112 insertions(+)
create mode 100644 src/syncedsettings.h
(limited to 'src')
diff --git a/src/syncedsettings.h b/src/syncedsettings.h
new file mode 100644
index 0000000..f83847c
--- /dev/null
+++ b/src/syncedsettings.h
@@ -0,0 +1,112 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * syncedsettings.h
+ *
+ * Thu Mar 31 09:23:27 CEST 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 Lesser 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser 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 <mutex>
+
+// type trait helper
+
+template <typename T, typename... Types>
+struct pack_contains;
+
+template <typename T, typename... Types>
+struct pack_contains<T, T, Types...>
+ : std::true_type {
+};
+
+template <typename T, typename Head, typename... Types>
+struct pack_contains<T, Head, Types...>
+ : pack_contains<T, Types...> {
+};
+
+template <typename T>
+struct pack_contains<T>
+ : std::false_type {
+};
+
+// --------------------------------------------------------------------
+
+template <typename T>
+class Group;
+
+template <typename T>
+class Accessor {
+ private:
+ std::lock_guard<std::mutex> lock;
+
+ public:
+ Accessor(Group<T>& parent)
+ : lock{parent.mutex}
+ , data{parent.data} {
+ }
+
+ T& data;
+};
+
+template <typename T>
+class Group {
+ private:
+ friend class Accessor<T>;
+
+ mutable std::mutex mutex;
+ T data;
+
+ public:
+ Group()
+ : mutex{}
+ , data{} {
+ }
+
+ Group(T const & data)
+ : mutex{}
+ , data{data} {
+ }
+
+ Group(T&& data)
+ : mutex{}
+ , data{std::move(data)} {
+ }
+
+ Group(Group<T> const & other)
+ : mutex{}
+ , data{} {
+ std::lock_guard<std::mutex> lock{other.mutex};
+ data = other.data;
+ }
+
+ Group(Group<T>&& other)
+ : mutex{}
+ , data{} {
+ std::lock_guard<std::mutex> lock{other.mutex};
+ std::swap(data, other.data);
+ }
+
+ operator T() const {
+ std::lock_guard<std::mutex> lock{mutex};
+ return data;
+ }
+};
--
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