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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012-2022 OpenVPN Inc.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License Version 3
// as published by the Free Software Foundation.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program in the COPYING file.
// If not, see <http://www.gnu.org/licenses/>.
// Macro to maintain thread-safety.
// Platforms like UWP and iOS may call core methods
// from another threads. Since core is not thread-safe,
// we provide OPENVPN_ASYNC_HANDLER macro which instantiates
// lock guard. It follows RIAA principle and locks global
// mutex in constructor and unlocks in destructor. This
// guarantees that code in block protected with this macro
// won't be called simultaneously from different threads.
#ifndef OPENVPN_COMMON_BIGMUTEX_H
#define OPENVPN_COMMON_BIGMUTEX_H
#include <mutex>
namespace openvpn {
namespace bigmutex {
inline std::recursive_mutex the_recursive_mutex;
}
#ifdef OPENVPN_ENABLE_BIGMUTEX
#define OPENVPN_ASYNC_HANDLER \
std::lock_guard<std::recursive_mutex> lg(bigmutex::the_recursive_mutex);
#else
#define OPENVPN_ASYNC_HANDLER
#endif
} // namespace openvpn
#endif
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