// | |
// detail/scoped_lock.hpp | |
// ~~~~~~~~~~~~~~~~~~~~~~ | |
// | |
// Copyright (c) 2003-2011 Christopher M. Kohlhoff (chris at kohlhoff dot com) | |
// | |
// Distributed under the Boost Software License, Version 1.0. (See accompanying | |
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
// | |
#ifndef BOOST_ASIO_DETAIL_SCOPED_LOCK_HPP | |
#define BOOST_ASIO_DETAIL_SCOPED_LOCK_HPP | |
#if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
# pragma once | |
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
#include <boost/asio/detail/noncopyable.hpp> | |
#include <boost/asio/detail/push_options.hpp> | |
namespace boost { | |
namespace asio { | |
namespace detail { | |
// Helper class to lock and unlock a mutex automatically. | |
template <typename Mutex> | |
class scoped_lock | |
: private noncopyable | |
{ | |
public: | |
// Constructor acquires the lock. | |
scoped_lock(Mutex& m) | |
: mutex_(m) | |
{ | |
mutex_.lock(); | |
locked_ = true; | |
} | |
// Destructor releases the lock. | |
~scoped_lock() | |
{ | |
if (locked_) | |
mutex_.unlock(); | |
} | |
// Explicitly acquire the lock. | |
void lock() | |
{ | |
if (!locked_) | |
{ | |
mutex_.lock(); | |
locked_ = true; | |
} | |
} | |
// Explicitly release the lock. | |
void unlock() | |
{ | |
if (locked_) | |
{ | |
mutex_.unlock(); | |
locked_ = false; | |
} | |
} | |
// Test whether the lock is held. | |
bool locked() const | |
{ | |
return locked_; | |
} | |
// Get the underlying mutex. | |
Mutex& mutex() | |
{ | |
return mutex_; | |
} | |
private: | |
// The underlying mutex. | |
Mutex& mutex_; | |
// Whether the mutex is currently locked or unlocked. | |
bool locked_; | |
}; | |
} // namespace detail | |
} // namespace asio | |
} // namespace boost | |
#include <boost/asio/detail/pop_options.hpp> | |
#endif // BOOST_ASIO_DETAIL_SCOPED_LOCK_HPP |