85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
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//
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// detail/executor_op.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 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 ASIO_DETAIL_EXECUTOR_OP_HPP
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#define ASIO_DETAIL_EXECUTOR_OP_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 "asio/detail/config.hpp"
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#include "asio/detail/fenced_block.hpp"
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#include "asio/detail/handler_alloc_helpers.hpp"
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#include "asio/detail/handler_invoke_helpers.hpp"
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#include "asio/detail/scheduler_operation.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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template <typename Handler, typename Alloc,
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typename Operation = scheduler_operation>
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class executor_op : public Operation
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{
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public:
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ASIO_DEFINE_HANDLER_ALLOCATOR_PTR(executor_op);
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template <typename H>
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executor_op(ASIO_MOVE_ARG(H) h, const Alloc& allocator)
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: Operation(&executor_op::do_complete),
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handler_(ASIO_MOVE_CAST(H)(h)),
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allocator_(allocator)
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{
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}
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static void do_complete(void* owner, Operation* base,
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const asio::error_code& /*ec*/,
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std::size_t /*bytes_transferred*/)
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{
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// Take ownership of the handler object.
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executor_op* o(static_cast<executor_op*>(base));
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Alloc allocator(o->allocator_);
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ptr p = { detail::addressof(allocator), o, o };
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ASIO_HANDLER_COMPLETION((*o));
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// Make a copy of the handler so that the memory can be deallocated before
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// the upcall is made. Even if we're not about to make an upcall, a
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// sub-object of the handler may be the true owner of the memory associated
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// with the handler. Consequently, a local copy of the handler is required
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// to ensure that any owning sub-object remains valid until after we have
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// deallocated the memory here.
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Handler handler(ASIO_MOVE_CAST(Handler)(o->handler_));
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p.reset();
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// Make the upcall if required.
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if (owner)
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{
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fenced_block b(fenced_block::half);
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ASIO_HANDLER_INVOCATION_BEGIN(());
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asio_handler_invoke_helpers::invoke(handler, handler);
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ASIO_HANDLER_INVOCATION_END;
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}
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}
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private:
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Handler handler_;
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Alloc allocator_;
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_DETAIL_EXECUTOR_OP_HPP
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