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68508fe564
bigmutex.hpp relies on OPENVPN_EXTERN and therefore it must include extern.hpp so that it can get defined when not specified elsewhere. Signed-off-by: Antonio Quartulli <antonio@openvpn.net>
53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2017 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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// Macro to maintain thread-safety.
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// Platforms like UWP and iOS may call core methods
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// from another threads. Since core is not thread-safe,
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// we provide OPENVPN_ASYNC_HANDLER macro which instantiates
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// lock guard. It follows RIAA principle and locks global
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// mutex in constructor and unlocks in destructor. This
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// guarantees that code in block protected with this macro
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// won't be called simultaneously from different threads.
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#ifndef OPENVPN_COMMON_BIGMUTEX_H
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#define OPENVPN_COMMON_BIGMUTEX_H
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#include <mutex>
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#include <openvpn/common/extern.hpp>
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namespace openvpn {
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namespace bigmutex {
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OPENVPN_EXTERN std::recursive_mutex the_recursive_mutex;
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}
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#ifdef OPENVPN_ENABLE_BIGMUTEX
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#define OPENVPN_ASYNC_HANDLER \
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std::lock_guard<std::recursive_mutex> lg(bigmutex::the_recursive_mutex);
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#else
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#define OPENVPN_ASYNC_HANDLER
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#endif
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}
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#endif
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