From e526594e983659858ce55027cdd06489cdf8af57 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Christian=20Gl=C3=B6ckner?= 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 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 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 + +// type trait helper + +template +struct pack_contains; + +template +struct pack_contains + : std::true_type { +}; + +template +struct pack_contains + : pack_contains { +}; + +template +struct pack_contains + : std::false_type { +}; + +// -------------------------------------------------------------------- + +template +class Group; + +template +class Accessor { + private: + std::lock_guard lock; + + public: + Accessor(Group& parent) + : lock{parent.mutex} + , data{parent.data} { + } + + T& data; +}; + +template +class Group { + private: + friend class Accessor; + + 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 const & other) + : mutex{} + , data{} { + std::lock_guard lock{other.mutex}; + data = other.data; + } + + Group(Group&& other) + : mutex{} + , data{} { + std::lock_guard lock{other.mutex}; + std::swap(data, other.data); + } + + operator T() const { + std::lock_guard lock{mutex}; + return data; + } +}; -- cgit v1.2.3