| // |
| // detail/conditionally_enabled_event.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2016 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_EVENT_HPP |
| #define ASIO_DETAIL_CONDITIONALLY_ENABLED_EVENT_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/conditionally_enabled_mutex.hpp" |
| #include "asio/detail/event.hpp" |
| #include "asio/detail/noncopyable.hpp" |
| #include "asio/detail/null_event.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_event |
| : private noncopyable |
| { |
| public: |
| // Constructor. |
| conditionally_enabled_event() |
| { |
| } |
| |
| // Destructor. |
| ~conditionally_enabled_event() |
| { |
| } |
| |
| // Signal the event. (Retained for backward compatibility.) |
| void signal(conditionally_enabled_mutex::scoped_lock& lock) |
| { |
| if (lock.mutex_.enabled_) |
| event_.signal(lock); |
| } |
| |
| // Signal all waiters. |
| void signal_all(conditionally_enabled_mutex::scoped_lock& lock) |
| { |
| if (lock.mutex_.enabled_) |
| event_.signal_all(lock); |
| } |
| |
| // Unlock the mutex and signal one waiter. |
| void unlock_and_signal_one( |
| conditionally_enabled_mutex::scoped_lock& lock) |
| { |
| if (lock.mutex_.enabled_) |
| event_.unlock_and_signal_one(lock); |
| } |
| |
| // If there's a waiter, unlock the mutex and signal it. |
| bool maybe_unlock_and_signal_one( |
| conditionally_enabled_mutex::scoped_lock& lock) |
| { |
| if (lock.mutex_.enabled_) |
| return event_.maybe_unlock_and_signal_one(lock); |
| else |
| return false; |
| } |
| |
| // Reset the event. |
| void clear(conditionally_enabled_mutex::scoped_lock& lock) |
| { |
| if (lock.mutex_.enabled_) |
| event_.clear(lock); |
| } |
| |
| // Wait for the event to become signalled. |
| void wait(conditionally_enabled_mutex::scoped_lock& lock) |
| { |
| if (lock.mutex_.enabled_) |
| event_.wait(lock); |
| else |
| null_event().wait(lock); |
| } |
| |
| // Timed wait for the event to become signalled. |
| bool wait_for_usec( |
| conditionally_enabled_mutex::scoped_lock& lock, long usec) |
| { |
| if (lock.mutex_.enabled_) |
| return event_.wait_for_usec(lock, usec); |
| else |
| return null_event().wait_for_usec(lock, usec); |
| } |
| |
| private: |
| asio::detail::event event_; |
| }; |
| |
| } // namespace detail |
| } // namespace asio |
| |
| #include "asio/detail/pop_options.hpp" |
| |
| #endif // ASIO_DETAIL_CONDITIONALLY_ENABLED_EVENT_HPP |