154 lines
4.3 KiB
C++
154 lines
4.3 KiB
C++
/*
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Copyright (c) 2015, 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_ALLOCATING_HANDLER_HPP_INCLUDED
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#define TORRENT_ALLOCATING_HANDLER_HPP_INCLUDED
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#include <boost/config.hpp>
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#include "libtorrent/config.hpp"
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#include "libtorrent/aux_/disable_warnings_push.hpp"
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#include <boost/aligned_storage.hpp>
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#include "libtorrent/aux_/disable_warnings_pop.hpp"
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namespace libtorrent { namespace aux
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{
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// this is meant to provide the actual storage for the handler allocator.
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// There's only a single slot, so the allocator is only supposed to be used
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// for handlers where there's only a single outstanding operation at a time,
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// per storage object. For instance, peers only ever have one outstanding
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// read operation at a time, so it can reuse its storage for read handlers.
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template <std::size_t Size>
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struct handler_storage
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{
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#ifdef TORRENT_DEBUG
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handler_storage()
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: used(false)
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{}
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bool used;
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#else
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handler_storage() {}
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#endif
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boost::aligned_storage<Size> bytes;
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private:
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handler_storage(handler_storage const&);
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};
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// this class is a wrapper for an asio handler object. Its main purpose
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// is to pass along additional parameters to the asio handler allocator
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// function, as well as providing a distinct type for the handler
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// allocator function to overload on
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template <class Handler, std::size_t Size>
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struct allocating_handler
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{
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// TODO: 3 make sure the handlers we pass in are potentially movable!
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#if !defined BOOST_NO_CXX11_RVALUE_REFERENCES
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allocating_handler(
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Handler&& h, handler_storage<Size>& s)
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: handler(std::move(h))
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, storage(s)
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{}
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#endif
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allocating_handler(
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Handler const& h, handler_storage<Size>& s)
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: handler(h)
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, storage(s)
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{}
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#if !defined BOOST_NO_CXX11_VARIADIC_TEMPLATES \
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&& !defined BOOST_NO_CXX11_RVALUE_REFERENCES
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template <class... A>
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void operator()(A&&... a) const
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{
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handler(std::forward<A>(a)...);
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}
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#else
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template <class A0>
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void operator()(A0 const& a0) const
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{
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handler(a0);
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}
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template <class A0, class A1>
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void operator()(A0 const& a0, A1 const& a1) const
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{
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handler(a0, a1);
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}
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template <class A0, class A1, class A2>
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void operator()(A0 const& a0, A1 const& a1, A2 const& a2) const
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{
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handler(a0, a1, a2);
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}
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#endif
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friend void* asio_handler_allocate(
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std::size_t size, allocating_handler<Handler, Size>* ctx)
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{
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TORRENT_UNUSED(size);
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TORRENT_ASSERT(size <= Size);
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#ifdef TORRENT_DEBUG
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TORRENT_ASSERT(!ctx->storage.used);
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ctx->storage.used = true;
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#endif
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return &ctx->storage.bytes;
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}
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friend void asio_handler_deallocate(
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void* ptr, std::size_t size, allocating_handler<Handler, Size>* ctx)
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{
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TORRENT_UNUSED(ptr);
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TORRENT_UNUSED(size);
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TORRENT_UNUSED(ctx);
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TORRENT_ASSERT(size <= Size);
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TORRENT_ASSERT(ptr == &ctx->storage.bytes);
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#ifdef TORRENT_DEBUG
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ctx->storage.used = false;
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#endif
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}
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Handler handler;
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handler_storage<Size>& storage;
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};
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}
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}
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#endif
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