88 lines
2.7 KiB
C++
88 lines
2.7 KiB
C++
/*
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Copyright (c) 2017, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_DEFERRED_HANDLER_HPP
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#define TORRENT_DEFERRED_HANDLER_HPP
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#include "libtorrent/assert.hpp"
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#include "libtorrent/io_service.hpp"
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namespace libtorrent { namespace aux {
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template <typename Handler>
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struct handler_wrapper
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{
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handler_wrapper(bool& in_flight, Handler&& h)
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: m_handler(std::move(h))
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, m_in_flight(in_flight) {}
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template <typename... Args>
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void operator()(Args&&... a)
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{
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TORRENT_ASSERT(m_in_flight);
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m_in_flight = false;
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m_handler(std::forward<Args>(a)...);
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}
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// forward asio handler allocator to the underlying handler's
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friend void* asio_handler_allocate(
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std::size_t size, handler_wrapper<Handler>* h)
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{
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return asio_handler_allocate(size, &h->m_handler);
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}
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friend void asio_handler_deallocate(
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void* ptr, std::size_t size, handler_wrapper<Handler>* h)
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{
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asio_handler_deallocate(ptr, size, &h->m_handler);
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}
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private:
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Handler m_handler;
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bool& m_in_flight;
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};
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struct deferred_handler
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{
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template <typename Handler>
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void post(io_service& ios, Handler&& h)
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{
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if (m_in_flight) return;
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m_in_flight = true;
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ios.post(handler_wrapper<Handler>(m_in_flight, std::forward<Handler>(h)));
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}
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private:
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bool m_in_flight = false;
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};
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}}
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#endif
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