forked from boostorg/beast
Vinnie Falco
02d5aedc29
fix #404 Parsing and serialization interfaces have been fine tuned and unified. For parsing these stream operations are defined: * read * read_header * read_some * async_read * async_read_header * async_read_some For serialization these stream operations are defined: * write * write_header * write_some * async_write * async_write_header * async_write_some
135 lines
2.8 KiB
C++
135 lines
2.8 KiB
C++
//
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// Copyright (c) 2013-2017 Vinnie Falco (vinnie dot falco at gmail 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 BEAST_TEST_YIELD_TO_HPP
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#define BEAST_TEST_YIELD_TO_HPP
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#include <boost/asio/io_service.hpp>
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#include <boost/asio/spawn.hpp>
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#include <boost/optional.hpp>
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#include <condition_variable>
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#include <functional>
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#include <mutex>
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#include <thread>
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#include <vector>
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namespace beast {
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namespace test {
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/** Mix-in to support tests using asio coroutines.
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Derive from this class and use yield_to to launch test
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functions inside coroutines. This is handy for testing
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asynchronous asio code.
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*/
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class enable_yield_to
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{
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protected:
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boost::asio::io_service ios_;
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private:
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boost::optional<boost::asio::io_service::work> work_;
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std::vector<std::thread> threads_;
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std::mutex m_;
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std::condition_variable cv_;
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std::size_t running_ = 0;
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public:
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/// The type of yield context passed to functions.
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using yield_context =
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boost::asio::yield_context;
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explicit
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enable_yield_to(std::size_t concurrency = 1)
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: work_(ios_)
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{
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threads_.reserve(concurrency);
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while(concurrency--)
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threads_.emplace_back(
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[&]{ ios_.run(); });
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}
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~enable_yield_to()
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{
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work_ = boost::none;
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for(auto& t : threads_)
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t.join();
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}
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/// Return the `io_service` associated with the object
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boost::asio::io_service&
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get_io_service()
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{
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return ios_;
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}
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/** Run one or more functions, each in a coroutine.
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This call will block until all coroutines terminate.
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Each functions should have this signature:
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@code
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void f(yield_context);
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@endcode
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@param fn... One or more functions to invoke.
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*/
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#if BEAST_DOXYGEN
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template<class... FN>
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void
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yield_to(FN&&... fn)
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#else
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template<class F0, class... FN>
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void
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yield_to(F0&& f0, FN&&... fn);
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#endif
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private:
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void
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spawn()
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{
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}
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template<class F0, class... FN>
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void
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spawn(F0&& f, FN&&... fn);
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};
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template<class F0, class... FN>
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void
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enable_yield_to::
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yield_to(F0&& f0, FN&&... fn)
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{
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running_ = 1 + sizeof...(FN);
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spawn(f0, fn...);
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std::unique_lock<std::mutex> lock{m_};
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cv_.wait(lock, [&]{ return running_ == 0; });
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}
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template<class F0, class... FN>
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inline
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void
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enable_yield_to::
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spawn(F0&& f, FN&&... fn)
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{
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boost::asio::spawn(ios_,
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[&](yield_context yield)
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{
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f(yield);
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std::lock_guard<std::mutex> lock{m_};
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if(--running_ == 0)
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cv_.notify_all();
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}
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, boost::coroutines::attributes(2 * 1024 * 1024));
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spawn(fn...);
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}
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} // test
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} // beast
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#endif
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