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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/std_event.hpp
parent558d74bffd9f069955af52c0b308a1d6169bcff0 (diff)
parent0330221d51421caa110b8c5dcb567cc3d0620eb9 (diff)
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Merge lime output into next branch
Diffstat (limited to 'lib/asio/detail/std_event.hpp')
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diff --git a/lib/asio/detail/std_event.hpp b/lib/asio/detail/std_event.hpp
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-//
-// detail/std_event.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_STD_EVENT_HPP
-#define ASIO_DETAIL_STD_EVENT_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-
-#if defined(ASIO_HAS_STD_MUTEX_AND_CONDVAR)
-
-#include <chrono>
-#include <condition_variable>
-#include "asio/detail/assert.hpp"
-#include "asio/detail/noncopyable.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace detail {
-
-class std_event
- : private noncopyable
-{
-public:
- // Constructor.
- std_event()
- : state_(0)
- {
- }
-
- // Destructor.
- ~std_event()
- {
- }
-
- // Signal the event. (Retained for backward compatibility.)
- template <typename Lock>
- void signal(Lock& lock)
- {
- this->signal_all(lock);
- }
-
- // Signal all waiters.
- template <typename Lock>
- void signal_all(Lock& lock)
- {
- ASIO_ASSERT(lock.locked());
- (void)lock;
- state_ |= 1;
- cond_.notify_all();
- }
-
- // Unlock the mutex and signal one waiter.
- template <typename Lock>
- void unlock_and_signal_one(Lock& lock)
- {
- ASIO_ASSERT(lock.locked());
- state_ |= 1;
- bool have_waiters = (state_ > 1);
- lock.unlock();
- if (have_waiters)
- cond_.notify_one();
- }
-
- // If there's a waiter, unlock the mutex and signal it.
- template <typename Lock>
- bool maybe_unlock_and_signal_one(Lock& lock)
- {
- ASIO_ASSERT(lock.locked());
- state_ |= 1;
- if (state_ > 1)
- {
- lock.unlock();
- cond_.notify_one();
- return true;
- }
- return false;
- }
-
- // Reset the event.
- template <typename Lock>
- void clear(Lock& lock)
- {
- ASIO_ASSERT(lock.locked());
- (void)lock;
- state_ &= ~std::size_t(1);
- }
-
- // Wait for the event to become signalled.
- template <typename Lock>
- void wait(Lock& lock)
- {
- ASIO_ASSERT(lock.locked());
- unique_lock_adapter u_lock(lock);
- while ((state_ & 1) == 0)
- {
- waiter w(state_);
- cond_.wait(u_lock.unique_lock_);
- }
- }
-
- // Timed wait for the event to become signalled.
- template <typename Lock>
- bool wait_for_usec(Lock& lock, long usec)
- {
- ASIO_ASSERT(lock.locked());
- unique_lock_adapter u_lock(lock);
- if ((state_ & 1) == 0)
- {
- waiter w(state_);
- cond_.wait_for(u_lock.unique_lock_, std::chrono::microseconds(usec));
- }
- return (state_ & 1) != 0;
- }
-
-private:
- // Helper class to temporarily adapt a scoped_lock into a unique_lock so that
- // it can be passed to std::condition_variable::wait().
- struct unique_lock_adapter
- {
- template <typename Lock>
- explicit unique_lock_adapter(Lock& lock)
- : unique_lock_(lock.mutex().mutex_, std::adopt_lock)
- {
- }
-
- ~unique_lock_adapter()
- {
- unique_lock_.release();
- }
-
- std::unique_lock<std::mutex> unique_lock_;
- };
-
- // Helper to increment and decrement the state to track outstanding waiters.
- class waiter
- {
- public:
- explicit waiter(std::size_t& state)
- : state_(state)
- {
- state_ += 2;
- }
-
- ~waiter()
- {
- state_ -= 2;
- }
-
- private:
- std::size_t& state_;
- };
-
- std::condition_variable cond_;
- std::size_t state_;
-};
-
-} // namespace detail
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // defined(ASIO_HAS_STD_MUTEX_AND_CONDVAR)
-
-#endif // ASIO_DETAIL_STD_EVENT_HPP