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145 lines
4.9 KiB
C++
145 lines
4.9 KiB
C++
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//
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// detail/strand_executor_service.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_ASIO_DETAIL_STRAND_EXECUTOR_SERVICE_HPP
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#define BOOST_ASIO_DETAIL_STRAND_EXECUTOR_SERVICE_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include <boost/asio/detail/config.hpp>
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#include <boost/asio/detail/atomic_count.hpp>
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#include <boost/asio/detail/executor_op.hpp>
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#include <boost/asio/detail/memory.hpp>
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#include <boost/asio/detail/mutex.hpp>
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#include <boost/asio/detail/op_queue.hpp>
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#include <boost/asio/detail/scheduler_operation.hpp>
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#include <boost/asio/detail/scoped_ptr.hpp>
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#include <boost/asio/execution_context.hpp>
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#include <boost/asio/detail/push_options.hpp>
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namespace boost {
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namespace asio {
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namespace detail {
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// Default service implementation for a strand.
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class strand_executor_service
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: public execution_context_service_base<strand_executor_service>
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{
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public:
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// The underlying implementation of a strand.
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class strand_impl
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{
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public:
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BOOST_ASIO_DECL ~strand_impl();
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private:
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friend class strand_executor_service;
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// Mutex to protect access to internal data.
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mutex* mutex_;
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// Indicates whether the strand is currently "locked" by a handler. This
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// means that there is a handler upcall in progress, or that the strand
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// itself has been scheduled in order to invoke some pending handlers.
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bool locked_;
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// Indicates that the strand has been shut down and will accept no further
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// handlers.
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bool shutdown_;
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// The handlers that are waiting on the strand but should not be run until
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// after the next time the strand is scheduled. This queue must only be
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// modified while the mutex is locked.
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op_queue<scheduler_operation> waiting_queue_;
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// The handlers that are ready to be run. Logically speaking, these are the
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// handlers that hold the strand's lock. The ready queue is only modified
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// from within the strand and so may be accessed without locking the mutex.
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op_queue<scheduler_operation> ready_queue_;
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// Pointers to adjacent handle implementations in linked list.
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strand_impl* next_;
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strand_impl* prev_;
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// The strand service in where the implementation is held.
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strand_executor_service* service_;
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};
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typedef shared_ptr<strand_impl> implementation_type;
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// Construct a new strand service for the specified context.
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BOOST_ASIO_DECL explicit strand_executor_service(execution_context& context);
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// Destroy all user-defined handler objects owned by the service.
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BOOST_ASIO_DECL void shutdown();
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// Create a new strand_executor implementation.
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BOOST_ASIO_DECL implementation_type create_implementation();
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// Request invocation of the given function.
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template <typename Executor, typename Function, typename Allocator>
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static void dispatch(const implementation_type& impl, Executor& ex,
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BOOST_ASIO_MOVE_ARG(Function) function, const Allocator& a);
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// Request invocation of the given function and return immediately.
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template <typename Executor, typename Function, typename Allocator>
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static void post(const implementation_type& impl, Executor& ex,
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BOOST_ASIO_MOVE_ARG(Function) function, const Allocator& a);
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// Request invocation of the given function and return immediately.
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template <typename Executor, typename Function, typename Allocator>
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static void defer(const implementation_type& impl, Executor& ex,
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BOOST_ASIO_MOVE_ARG(Function) function, const Allocator& a);
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// Determine whether the strand is running in the current thread.
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BOOST_ASIO_DECL static bool running_in_this_thread(
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const implementation_type& impl);
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private:
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friend class strand_impl;
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template <typename Executor> class invoker;
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// Adds a function to the strand. Returns true if it acquires the lock.
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BOOST_ASIO_DECL static bool enqueue(const implementation_type& impl,
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scheduler_operation* op);
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// Mutex to protect access to the service-wide state.
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mutex mutex_;
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// Number of mutexes shared between all strand objects.
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enum { num_mutexes = 193 };
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// Pool of mutexes.
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scoped_ptr<mutex> mutexes_[num_mutexes];
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// Extra value used when hashing to prevent recycled memory locations from
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// getting the same mutex.
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std::size_t salt_;
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// The head of a linked list of all implementations.
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strand_impl* impl_list_;
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};
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} // namespace detail
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} // namespace asio
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} // namespace boost
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#include <boost/asio/detail/pop_options.hpp>
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#include <boost/asio/detail/impl/strand_executor_service.hpp>
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#if defined(BOOST_ASIO_HEADER_ONLY)
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# include <boost/asio/detail/impl/strand_executor_service.ipp>
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#endif // defined(BOOST_ASIO_HEADER_ONLY)
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#endif // BOOST_ASIO_DETAIL_STRAND_EXECUTOR_SERVICE_HPP
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