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authorMatthias P. Braendli <matthias.braendli@mpb.li>2019-10-07 04:52:50 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2019-10-07 04:52:50 +0200
commit0aa6201a490bfabc0ae021ceb9f1fb0f46727c5d (patch)
treea71d934d8151dd43e7c16555fef17fd749c5da70 /lib/asio/detail/conditionally_enabled_mutex.hpp
parent558d74bffd9f069955af52c0b308a1d6169bcff0 (diff)
parent0330221d51421caa110b8c5dcb567cc3d0620eb9 (diff)
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Merge lime output into next branch
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diff --git a/lib/asio/detail/conditionally_enabled_mutex.hpp b/lib/asio/detail/conditionally_enabled_mutex.hpp
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-//
-// detail/conditionally_enabled_mutex.hpp
-// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 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 ASIO_DETAIL_CONDITIONALLY_ENABLED_MUTEX_HPP
-#define ASIO_DETAIL_CONDITIONALLY_ENABLED_MUTEX_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include "asio/detail/mutex.hpp"
-#include "asio/detail/noncopyable.hpp"
-#include "asio/detail/scoped_lock.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace detail {
-
-// Mutex adapter used to conditionally enable or disable locking.
-class conditionally_enabled_mutex
- : private noncopyable
-{
-public:
- // Helper class to lock and unlock a mutex automatically.
- class scoped_lock
- : private noncopyable
- {
- public:
- // Tag type used to distinguish constructors.
- enum adopt_lock_t { adopt_lock };
-
- // Constructor adopts a lock that is already held.
- scoped_lock(conditionally_enabled_mutex& m, adopt_lock_t)
- : mutex_(m),
- locked_(m.enabled_)
- {
- }
-
- // Constructor acquires the lock.
- explicit scoped_lock(conditionally_enabled_mutex& m)
- : mutex_(m)
- {
- if (m.enabled_)
- {
- mutex_.mutex_.lock();
- locked_ = true;
- }
- else
- locked_ = false;
- }
-
- // Destructor releases the lock.
- ~scoped_lock()
- {
- if (locked_)
- mutex_.mutex_.unlock();
- }
-
- // Explicitly acquire the lock.
- void lock()
- {
- if (mutex_.enabled_ && !locked_)
- {
- mutex_.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.
- asio::detail::mutex& mutex()
- {
- return mutex_.mutex_;
- }
-
- private:
- friend class conditionally_enabled_event;
- conditionally_enabled_mutex& mutex_;
- bool locked_;
- };
-
- // Constructor.
- explicit conditionally_enabled_mutex(bool enabled)
- : enabled_(enabled)
- {
- }
-
- // Destructor.
- ~conditionally_enabled_mutex()
- {
- }
-
- // Determine whether locking is enabled.
- bool enabled() const
- {
- return enabled_;
- }
-
- // Lock the mutex.
- void lock()
- {
- if (enabled_)
- mutex_.lock();
- }
-
- // Unlock the mutex.
- void unlock()
- {
- if (enabled_)
- mutex_.unlock();
- }
-
-private:
- friend class scoped_lock;
- friend class conditionally_enabled_event;
- asio::detail::mutex mutex_;
- const bool enabled_;
-};
-
-} // namespace detail
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_DETAIL_CONDITIONALLY_ENABLED_MUTEX_HPP