/usr/include/caf/locks.hpp is in libcaf-dev 0.13.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* ____ _ _____ *
* / ___| / \ | ___| C++ *
* | | / _ \ | |_ Actor *
* | |___ / ___ \| _| Framework *
* \____/_/ \_|_| *
* *
* Copyright (C) 2011 - 2015 *
* Dominik Charousset <dominik.charousset (at) haw-hamburg.de> *
* *
* Distributed under the terms and conditions of the BSD 3-Clause License or *
* (at your option) under the terms and conditions of the Boost Software *
* License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE. *
* *
* If you did not receive a copy of the license files, see *
* http://opensource.org/licenses/BSD-3-Clause and *
* http://www.boost.org/LICENSE_1_0.txt. *
******************************************************************************/
#ifndef CAF_DETAIL_LOCKS_HPP
#define CAF_DETAIL_LOCKS_HPP
#include <mutex>
namespace caf {
template <class Lockable>
using unique_lock = std::unique_lock<Lockable>;
template <class SharedLockable>
class shared_lock {
public:
using lockable = SharedLockable;
explicit shared_lock(lockable& arg) : m_lockable(&arg) {
m_lockable->lock_shared();
}
~shared_lock() {
unlock();
}
bool owns_lock() const {
return m_lockable != nullptr;
}
void unlock() {
if (m_lockable) {
m_lockable->unlock_shared();
m_lockable = nullptr;
}
}
lockable* release() {
auto result = m_lockable;
m_lockable = nullptr;
return result;
}
private:
lockable* m_lockable;
};
template <class SharedLockable>
using upgrade_lock = shared_lock<SharedLockable>;
template <class UpgradeLockable>
class upgrade_to_unique_lock {
public:
using lockable = UpgradeLockable;
template <class LockType>
upgrade_to_unique_lock(LockType& other) {
m_lockable = other.release();
if (m_lockable) m_lockable->unlock_upgrade_and_lock();
}
~upgrade_to_unique_lock() {
unlock();
}
bool owns_lock() const {
return m_lockable != nullptr;
}
void unlock() {
if (m_lockable) {
m_lockable->unlock();
m_lockable = nullptr;
}
}
private:
lockable* m_lockable;
};
} // namespace caf
#endif // CAF_DETAIL_LOCKS_HPP
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