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Diffstat (limited to '3rdParty/Boost/src/boost/asio/detail/reactive_descriptor_service.hpp')
-rw-r--r--3rdParty/Boost/src/boost/asio/detail/reactive_descriptor_service.hpp712
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diff --git a/3rdParty/Boost/src/boost/asio/detail/reactive_descriptor_service.hpp b/3rdParty/Boost/src/boost/asio/detail/reactive_descriptor_service.hpp
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+++ b/3rdParty/Boost/src/boost/asio/detail/reactive_descriptor_service.hpp
@@ -0,0 +1,712 @@
+//
+// reactive_descriptor_service.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_DETAIL_REACTIVE_DESCRIPTOR_SERVICE_HPP
+#define BOOST_ASIO_DETAIL_REACTIVE_DESCRIPTOR_SERVICE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/push_options.hpp>
+
+#include <boost/asio/buffer.hpp>
+#include <boost/asio/error.hpp>
+#include <boost/asio/io_service.hpp>
+#include <boost/asio/detail/bind_handler.hpp>
+#include <boost/asio/detail/handler_base_from_member.hpp>
+#include <boost/asio/detail/noncopyable.hpp>
+#include <boost/asio/detail/service_base.hpp>
+#include <boost/asio/detail/descriptor_ops.hpp>
+
+#if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+template <typename Reactor>
+class reactive_descriptor_service
+ : public boost::asio::detail::service_base<
+ reactive_descriptor_service<Reactor> >
+{
+public:
+ // The native type of a descriptor.
+ typedef int native_type;
+
+ // The implementation type of the descriptor.
+ class implementation_type
+ : private boost::asio::detail::noncopyable
+ {
+ public:
+ // Default constructor.
+ implementation_type()
+ : descriptor_(-1),
+ flags_(0)
+ {
+ }
+
+ private:
+ // Only this service will have access to the internal values.
+ friend class reactive_descriptor_service<Reactor>;
+
+ // The native descriptor representation.
+ int descriptor_;
+
+ enum
+ {
+ user_set_non_blocking = 1, // The user wants a non-blocking descriptor.
+ internal_non_blocking = 2 // The descriptor has been set non-blocking.
+ };
+
+ // Flags indicating the current state of the descriptor.
+ unsigned char flags_;
+
+ // Per-descriptor data used by the reactor.
+ typename Reactor::per_descriptor_data reactor_data_;
+ };
+
+ // The maximum number of buffers to support in a single operation.
+ enum { max_buffers = 64 < max_iov_len ? 64 : max_iov_len };
+
+ // Constructor.
+ reactive_descriptor_service(boost::asio::io_service& io_service)
+ : boost::asio::detail::service_base<
+ reactive_descriptor_service<Reactor> >(io_service),
+ reactor_(boost::asio::use_service<Reactor>(io_service))
+ {
+ reactor_.init_task();
+ }
+
+ // Destroy all user-defined handler objects owned by the service.
+ void shutdown_service()
+ {
+ }
+
+ // Construct a new descriptor implementation.
+ void construct(implementation_type& impl)
+ {
+ impl.descriptor_ = -1;
+ impl.flags_ = 0;
+ }
+
+ // Destroy a descriptor implementation.
+ void destroy(implementation_type& impl)
+ {
+ if (impl.descriptor_ != -1)
+ {
+ reactor_.close_descriptor(impl.descriptor_, impl.reactor_data_);
+
+ if (impl.flags_ & implementation_type::internal_non_blocking)
+ {
+ ioctl_arg_type non_blocking = 0;
+ boost::system::error_code ignored_ec;
+ descriptor_ops::ioctl(impl.descriptor_,
+ FIONBIO, &non_blocking, ignored_ec);
+ impl.flags_ &= ~implementation_type::internal_non_blocking;
+ }
+
+ boost::system::error_code ignored_ec;
+ descriptor_ops::close(impl.descriptor_, ignored_ec);
+
+ impl.descriptor_ = -1;
+ }
+ }
+
+ // Assign a native descriptor to a descriptor implementation.
+ boost::system::error_code assign(implementation_type& impl,
+ const native_type& native_descriptor, boost::system::error_code& ec)
+ {
+ if (is_open(impl))
+ {
+ ec = boost::asio::error::already_open;
+ return ec;
+ }
+
+ if (int err = reactor_.register_descriptor(
+ native_descriptor, impl.reactor_data_))
+ {
+ ec = boost::system::error_code(err,
+ boost::asio::error::get_system_category());
+ return ec;
+ }
+
+ impl.descriptor_ = native_descriptor;
+ impl.flags_ = 0;
+ ec = boost::system::error_code();
+ return ec;
+ }
+
+ // Determine whether the descriptor is open.
+ bool is_open(const implementation_type& impl) const
+ {
+ return impl.descriptor_ != -1;
+ }
+
+ // Destroy a descriptor implementation.
+ boost::system::error_code close(implementation_type& impl,
+ boost::system::error_code& ec)
+ {
+ if (is_open(impl))
+ {
+ reactor_.close_descriptor(impl.descriptor_, impl.reactor_data_);
+
+ if (impl.flags_ & implementation_type::internal_non_blocking)
+ {
+ ioctl_arg_type non_blocking = 0;
+ boost::system::error_code ignored_ec;
+ descriptor_ops::ioctl(impl.descriptor_,
+ FIONBIO, &non_blocking, ignored_ec);
+ impl.flags_ &= ~implementation_type::internal_non_blocking;
+ }
+
+ if (descriptor_ops::close(impl.descriptor_, ec) == -1)
+ return ec;
+
+ impl.descriptor_ = -1;
+ }
+
+ ec = boost::system::error_code();
+ return ec;
+ }
+
+ // Get the native descriptor representation.
+ native_type native(const implementation_type& impl) const
+ {
+ return impl.descriptor_;
+ }
+
+ // Cancel all operations associated with the descriptor.
+ boost::system::error_code cancel(implementation_type& impl,
+ boost::system::error_code& ec)
+ {
+ if (!is_open(impl))
+ {
+ ec = boost::asio::error::bad_descriptor;
+ return ec;
+ }
+
+ reactor_.cancel_ops(impl.descriptor_, impl.reactor_data_);
+ ec = boost::system::error_code();
+ return ec;
+ }
+
+ // Perform an IO control command on the descriptor.
+ template <typename IO_Control_Command>
+ boost::system::error_code io_control(implementation_type& impl,
+ IO_Control_Command& command, boost::system::error_code& ec)
+ {
+ if (!is_open(impl))
+ {
+ ec = boost::asio::error::bad_descriptor;
+ return ec;
+ }
+
+ if (command.name() == static_cast<int>(FIONBIO))
+ {
+ if (command.get())
+ impl.flags_ |= implementation_type::user_set_non_blocking;
+ else
+ impl.flags_ &= ~implementation_type::user_set_non_blocking;
+ ec = boost::system::error_code();
+ }
+ else
+ {
+ descriptor_ops::ioctl(impl.descriptor_, command.name(),
+ static_cast<ioctl_arg_type*>(command.data()), ec);
+ }
+ return ec;
+ }
+
+ // Write some data to the descriptor.
+ template <typename ConstBufferSequence>
+ size_t write_some(implementation_type& impl,
+ const ConstBufferSequence& buffers, boost::system::error_code& ec)
+ {
+ if (!is_open(impl))
+ {
+ ec = boost::asio::error::bad_descriptor;
+ return 0;
+ }
+
+ // Copy buffers into array.
+ descriptor_ops::buf bufs[max_buffers];
+ typename ConstBufferSequence::const_iterator iter = buffers.begin();
+ typename ConstBufferSequence::const_iterator end = buffers.end();
+ size_t i = 0;
+ size_t total_buffer_size = 0;
+ for (; iter != end && i < max_buffers; ++iter, ++i)
+ {
+ boost::asio::const_buffer buffer(*iter);
+ descriptor_ops::init_buf(bufs[i],
+ boost::asio::buffer_cast<const void*>(buffer),
+ boost::asio::buffer_size(buffer));
+ total_buffer_size += boost::asio::buffer_size(buffer);
+ }
+
+ // A request to read_some 0 bytes on a stream is a no-op.
+ if (total_buffer_size == 0)
+ {
+ ec = boost::system::error_code();
+ return 0;
+ }
+
+ // Make descriptor non-blocking if user wants non-blocking.
+ if (impl.flags_ & implementation_type::user_set_non_blocking)
+ {
+ if (!(impl.flags_ & implementation_type::internal_non_blocking))
+ {
+ ioctl_arg_type non_blocking = 1;
+ if (descriptor_ops::ioctl(impl.descriptor_,
+ FIONBIO, &non_blocking, ec))
+ return 0;
+ impl.flags_ |= implementation_type::internal_non_blocking;
+ }
+ }
+
+ // Send the data.
+ for (;;)
+ {
+ // Try to complete the operation without blocking.
+ int bytes_sent = descriptor_ops::gather_write(
+ impl.descriptor_, bufs, i, ec);
+
+ // Check if operation succeeded.
+ if (bytes_sent >= 0)
+ return bytes_sent;
+
+ // Operation failed.
+ if ((impl.flags_ & implementation_type::user_set_non_blocking)
+ || (ec != boost::asio::error::would_block
+ && ec != boost::asio::error::try_again))
+ return 0;
+
+ // Wait for descriptor to become ready.
+ if (descriptor_ops::poll_write(impl.descriptor_, ec) < 0)
+ return 0;
+ }
+ }
+
+ // Wait until data can be written without blocking.
+ size_t write_some(implementation_type& impl,
+ const null_buffers&, boost::system::error_code& ec)
+ {
+ if (!is_open(impl))
+ {
+ ec = boost::asio::error::bad_descriptor;
+ return 0;
+ }
+
+ // Wait for descriptor to become ready.
+ descriptor_ops::poll_write(impl.descriptor_, ec);
+
+ return 0;
+ }
+
+ template <typename ConstBufferSequence, typename Handler>
+ class write_operation :
+ public handler_base_from_member<Handler>
+ {
+ public:
+ write_operation(int descriptor, boost::asio::io_service& io_service,
+ const ConstBufferSequence& buffers, Handler handler)
+ : handler_base_from_member<Handler>(handler),
+ descriptor_(descriptor),
+ io_service_(io_service),
+ work_(io_service),
+ buffers_(buffers)
+ {
+ }
+
+ bool perform(boost::system::error_code& ec,
+ std::size_t& bytes_transferred)
+ {
+ // Check whether the operation was successful.
+ if (ec)
+ {
+ bytes_transferred = 0;
+ return true;
+ }
+
+ // Copy buffers into array.
+ descriptor_ops::buf bufs[max_buffers];
+ typename ConstBufferSequence::const_iterator iter = buffers_.begin();
+ typename ConstBufferSequence::const_iterator end = buffers_.end();
+ size_t i = 0;
+ for (; iter != end && i < max_buffers; ++iter, ++i)
+ {
+ boost::asio::const_buffer buffer(*iter);
+ descriptor_ops::init_buf(bufs[i],
+ boost::asio::buffer_cast<const void*>(buffer),
+ boost::asio::buffer_size(buffer));
+ }
+
+ // Write the data.
+ int bytes = descriptor_ops::gather_write(descriptor_, bufs, i, ec);
+
+ // Check if we need to run the operation again.
+ if (ec == boost::asio::error::would_block
+ || ec == boost::asio::error::try_again)
+ return false;
+
+ bytes_transferred = (bytes < 0 ? 0 : bytes);
+ return true;
+ }
+
+ void complete(const boost::system::error_code& ec,
+ std::size_t bytes_transferred)
+ {
+ io_service_.post(bind_handler(this->handler_, ec, bytes_transferred));
+ }
+
+ private:
+ int descriptor_;
+ boost::asio::io_service& io_service_;
+ boost::asio::io_service::work work_;
+ ConstBufferSequence buffers_;
+ };
+
+ // Start an asynchronous write. The data being sent must be valid for the
+ // lifetime of the asynchronous operation.
+ template <typename ConstBufferSequence, typename Handler>
+ void async_write_some(implementation_type& impl,
+ const ConstBufferSequence& buffers, Handler handler)
+ {
+ if (!is_open(impl))
+ {
+ this->get_io_service().post(bind_handler(handler,
+ boost::asio::error::bad_descriptor, 0));
+ }
+ else
+ {
+ // Determine total size of buffers.
+ typename ConstBufferSequence::const_iterator iter = buffers.begin();
+ typename ConstBufferSequence::const_iterator end = buffers.end();
+ size_t i = 0;
+ size_t total_buffer_size = 0;
+ for (; iter != end && i < max_buffers; ++iter, ++i)
+ {
+ boost::asio::const_buffer buffer(*iter);
+ total_buffer_size += boost::asio::buffer_size(buffer);
+ }
+
+ // A request to read_some 0 bytes on a stream is a no-op.
+ if (total_buffer_size == 0)
+ {
+ this->get_io_service().post(bind_handler(handler,
+ boost::system::error_code(), 0));
+ return;
+ }
+
+ // Make descriptor non-blocking.
+ if (!(impl.flags_ & implementation_type::internal_non_blocking))
+ {
+ ioctl_arg_type non_blocking = 1;
+ boost::system::error_code ec;
+ if (descriptor_ops::ioctl(impl.descriptor_, FIONBIO, &non_blocking, ec))
+ {
+ this->get_io_service().post(bind_handler(handler, ec, 0));
+ return;
+ }
+ impl.flags_ |= implementation_type::internal_non_blocking;
+ }
+
+ reactor_.start_write_op(impl.descriptor_, impl.reactor_data_,
+ write_operation<ConstBufferSequence, Handler>(
+ impl.descriptor_, this->get_io_service(), buffers, handler));
+ }
+ }
+
+ template <typename Handler>
+ class null_buffers_operation :
+ public handler_base_from_member<Handler>
+ {
+ public:
+ null_buffers_operation(boost::asio::io_service& io_service, Handler handler)
+ : handler_base_from_member<Handler>(handler),
+ work_(io_service)
+ {
+ }
+
+ bool perform(boost::system::error_code&,
+ std::size_t& bytes_transferred)
+ {
+ bytes_transferred = 0;
+ return true;
+ }
+
+ void complete(const boost::system::error_code& ec,
+ std::size_t bytes_transferred)
+ {
+ work_.get_io_service().post(bind_handler(
+ this->handler_, ec, bytes_transferred));
+ }
+
+ private:
+ boost::asio::io_service::work work_;
+ };
+
+ // Start an asynchronous wait until data can be written without blocking.
+ template <typename Handler>
+ void async_write_some(implementation_type& impl,
+ const null_buffers&, Handler handler)
+ {
+ if (!is_open(impl))
+ {
+ this->get_io_service().post(bind_handler(handler,
+ boost::asio::error::bad_descriptor, 0));
+ }
+ else
+ {
+ reactor_.start_write_op(impl.descriptor_, impl.reactor_data_,
+ null_buffers_operation<Handler>(this->get_io_service(), handler),
+ false);
+ }
+ }
+
+ // Read some data from the stream. Returns the number of bytes read.
+ template <typename MutableBufferSequence>
+ size_t read_some(implementation_type& impl,
+ const MutableBufferSequence& buffers, boost::system::error_code& ec)
+ {
+ if (!is_open(impl))
+ {
+ ec = boost::asio::error::bad_descriptor;
+ return 0;
+ }
+
+ // Copy buffers into array.
+ descriptor_ops::buf bufs[max_buffers];
+ typename MutableBufferSequence::const_iterator iter = buffers.begin();
+ typename MutableBufferSequence::const_iterator end = buffers.end();
+ size_t i = 0;
+ size_t total_buffer_size = 0;
+ for (; iter != end && i < max_buffers; ++iter, ++i)
+ {
+ boost::asio::mutable_buffer buffer(*iter);
+ descriptor_ops::init_buf(bufs[i],
+ boost::asio::buffer_cast<void*>(buffer),
+ boost::asio::buffer_size(buffer));
+ total_buffer_size += boost::asio::buffer_size(buffer);
+ }
+
+ // A request to read_some 0 bytes on a stream is a no-op.
+ if (total_buffer_size == 0)
+ {
+ ec = boost::system::error_code();
+ return 0;
+ }
+
+ // Make descriptor non-blocking if user wants non-blocking.
+ if (impl.flags_ & implementation_type::user_set_non_blocking)
+ {
+ if (!(impl.flags_ & implementation_type::internal_non_blocking))
+ {
+ ioctl_arg_type non_blocking = 1;
+ if (descriptor_ops::ioctl(impl.descriptor_, FIONBIO, &non_blocking, ec))
+ return 0;
+ impl.flags_ |= implementation_type::internal_non_blocking;
+ }
+ }
+
+ // Read some data.
+ for (;;)
+ {
+ // Try to complete the operation without blocking.
+ int bytes_read = descriptor_ops::scatter_read(
+ impl.descriptor_, bufs, i, ec);
+
+ // Check if operation succeeded.
+ if (bytes_read > 0)
+ return bytes_read;
+
+ // Check for EOF.
+ if (bytes_read == 0)
+ {
+ ec = boost::asio::error::eof;
+ return 0;
+ }
+
+ // Operation failed.
+ if ((impl.flags_ & implementation_type::user_set_non_blocking)
+ || (ec != boost::asio::error::would_block
+ && ec != boost::asio::error::try_again))
+ return 0;
+
+ // Wait for descriptor to become ready.
+ if (descriptor_ops::poll_read(impl.descriptor_, ec) < 0)
+ return 0;
+ }
+ }
+
+ // Wait until data can be read without blocking.
+ size_t read_some(implementation_type& impl,
+ const null_buffers&, boost::system::error_code& ec)
+ {
+ if (!is_open(impl))
+ {
+ ec = boost::asio::error::bad_descriptor;
+ return 0;
+ }
+
+ // Wait for descriptor to become ready.
+ descriptor_ops::poll_read(impl.descriptor_, ec);
+
+ return 0;
+ }
+
+ template <typename MutableBufferSequence, typename Handler>
+ class read_operation :
+ public handler_base_from_member<Handler>
+ {
+ public:
+ read_operation(int descriptor, boost::asio::io_service& io_service,
+ const MutableBufferSequence& buffers, Handler handler)
+ : handler_base_from_member<Handler>(handler),
+ descriptor_(descriptor),
+ io_service_(io_service),
+ work_(io_service),
+ buffers_(buffers)
+ {
+ }
+
+ bool perform(boost::system::error_code& ec,
+ std::size_t& bytes_transferred)
+ {
+ // Check whether the operation was successful.
+ if (ec)
+ {
+ bytes_transferred = 0;
+ return true;
+ }
+
+ // Copy buffers into array.
+ descriptor_ops::buf bufs[max_buffers];
+ typename MutableBufferSequence::const_iterator iter = buffers_.begin();
+ typename MutableBufferSequence::const_iterator end = buffers_.end();
+ size_t i = 0;
+ for (; iter != end && i < max_buffers; ++iter, ++i)
+ {
+ boost::asio::mutable_buffer buffer(*iter);
+ descriptor_ops::init_buf(bufs[i],
+ boost::asio::buffer_cast<void*>(buffer),
+ boost::asio::buffer_size(buffer));
+ }
+
+ // Read some data.
+ int bytes = descriptor_ops::scatter_read(descriptor_, bufs, i, ec);
+ if (bytes == 0)
+ ec = boost::asio::error::eof;
+
+ // Check if we need to run the operation again.
+ if (ec == boost::asio::error::would_block
+ || ec == boost::asio::error::try_again)
+ return false;
+
+ bytes_transferred = (bytes < 0 ? 0 : bytes);
+ return true;
+ }
+
+ void complete(const boost::system::error_code& ec,
+ std::size_t bytes_transferred)
+ {
+ io_service_.post(bind_handler(this->handler_, ec, bytes_transferred));
+ }
+
+ private:
+ int descriptor_;
+ boost::asio::io_service& io_service_;
+ boost::asio::io_service::work work_;
+ MutableBufferSequence buffers_;
+ };
+
+ // Start an asynchronous read. The buffer for the data being read must be
+ // valid for the lifetime of the asynchronous operation.
+ template <typename MutableBufferSequence, typename Handler>
+ void async_read_some(implementation_type& impl,
+ const MutableBufferSequence& buffers, Handler handler)
+ {
+ if (!is_open(impl))
+ {
+ this->get_io_service().post(bind_handler(handler,
+ boost::asio::error::bad_descriptor, 0));
+ }
+ else
+ {
+ // Determine total size of buffers.
+ typename MutableBufferSequence::const_iterator iter = buffers.begin();
+ typename MutableBufferSequence::const_iterator end = buffers.end();
+ size_t i = 0;
+ size_t total_buffer_size = 0;
+ for (; iter != end && i < max_buffers; ++iter, ++i)
+ {
+ boost::asio::mutable_buffer buffer(*iter);
+ total_buffer_size += boost::asio::buffer_size(buffer);
+ }
+
+ // A request to read_some 0 bytes on a stream is a no-op.
+ if (total_buffer_size == 0)
+ {
+ this->get_io_service().post(bind_handler(handler,
+ boost::system::error_code(), 0));
+ return;
+ }
+
+ // Make descriptor non-blocking.
+ if (!(impl.flags_ & implementation_type::internal_non_blocking))
+ {
+ ioctl_arg_type non_blocking = 1;
+ boost::system::error_code ec;
+ if (descriptor_ops::ioctl(impl.descriptor_, FIONBIO, &non_blocking, ec))
+ {
+ this->get_io_service().post(bind_handler(handler, ec, 0));
+ return;
+ }
+ impl.flags_ |= implementation_type::internal_non_blocking;
+ }
+
+ reactor_.start_read_op(impl.descriptor_, impl.reactor_data_,
+ read_operation<MutableBufferSequence, Handler>(
+ impl.descriptor_, this->get_io_service(), buffers, handler));
+ }
+ }
+
+ // Wait until data can be read without blocking.
+ template <typename Handler>
+ void async_read_some(implementation_type& impl,
+ const null_buffers&, Handler handler)
+ {
+ if (!is_open(impl))
+ {
+ this->get_io_service().post(bind_handler(handler,
+ boost::asio::error::bad_descriptor, 0));
+ }
+ else
+ {
+ reactor_.start_read_op(impl.descriptor_, impl.reactor_data_,
+ null_buffers_operation<Handler>(this->get_io_service(), handler),
+ false);
+ }
+ }
+
+private:
+ // The selector that performs event demultiplexing for the service.
+ Reactor& reactor_;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_REACTIVE_DESCRIPTOR_SERVICE_HPP