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author | Remko Tronçon <git@el-tramo.be> | 2010-11-24 20:33:19 (GMT) |
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committer | Remko Tronçon <git@el-tramo.be> | 2010-11-24 20:35:17 (GMT) |
commit | 332d60c56dfaa11fdd135088279d15cd5983b3d4 (patch) | |
tree | dd77717a4e1732da929d5ff8a0471fa3f005e201 /3rdParty/Boost/src/boost/asio/detail/impl/strand_service.hpp | |
parent | 90c44a10fec26d2a0935b2d62e82b6a5be028373 (diff) | |
download | swift-contrib-332d60c56dfaa11fdd135088279d15cd5983b3d4.zip swift-contrib-332d60c56dfaa11fdd135088279d15cd5983b3d4.tar.bz2 |
Upgraded Boost to 1.45.0.
Diffstat (limited to '3rdParty/Boost/src/boost/asio/detail/impl/strand_service.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/asio/detail/impl/strand_service.hpp | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/asio/detail/impl/strand_service.hpp b/3rdParty/Boost/src/boost/asio/detail/impl/strand_service.hpp new file mode 100644 index 0000000..e959947 --- /dev/null +++ b/3rdParty/Boost/src/boost/asio/detail/impl/strand_service.hpp @@ -0,0 +1,142 @@ +// +// detail/impl/strand_service.hpp +// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// +// Copyright (c) 2003-2010 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_IMPL_STRAND_SERVICE_HPP +#define BOOST_ASIO_DETAIL_IMPL_STRAND_SERVICE_HPP + +#if defined(_MSC_VER) && (_MSC_VER >= 1200) +# pragma once +#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) + +#include <boost/asio/detail/call_stack.hpp> +#include <boost/asio/detail/completion_handler.hpp> +#include <boost/asio/detail/fenced_block.hpp> +#include <boost/asio/detail/handler_alloc_helpers.hpp> +#include <boost/asio/detail/handler_invoke_helpers.hpp> + +#include <boost/asio/detail/push_options.hpp> + +namespace boost { +namespace asio { +namespace detail { + +inline strand_service::strand_impl::strand_impl() + : operation(&strand_service::do_complete), + count_(0) +{ +} + +struct strand_service::on_dispatch_exit +{ + io_service_impl* io_service_; + strand_impl* impl_; + + ~on_dispatch_exit() + { + impl_->mutex_.lock(); + bool more_handlers = (--impl_->count_ > 0); + impl_->mutex_.unlock(); + + if (more_handlers) + io_service_->post_immediate_completion(impl_); + } +}; + +inline void strand_service::destroy(strand_service::implementation_type& impl) +{ + impl = 0; +} + +template <typename Handler> +void strand_service::dispatch(strand_service::implementation_type& impl, + Handler handler) +{ + // If we are already in the strand then the handler can run immediately. + if (call_stack<strand_impl>::contains(impl)) + { + boost::asio::detail::fenced_block b; + boost_asio_handler_invoke_helpers::invoke(handler, handler); + return; + } + + // Allocate and construct an operation to wrap the handler. + typedef completion_handler<Handler> op; + typename op::ptr p = { boost::addressof(handler), + boost_asio_handler_alloc_helpers::allocate( + sizeof(op), handler), 0 }; + p.p = new (p.v) op(handler); + + // If we are running inside the io_service, and no other handler is queued + // or running, then the handler can run immediately. + bool can_dispatch = call_stack<io_service_impl>::contains(&io_service_); + impl->mutex_.lock(); + bool first = (++impl->count_ == 1); + if (can_dispatch && first) + { + // Immediate invocation is allowed. + impl->mutex_.unlock(); + + // Memory must be releaesed before any upcall is made. + p.reset(); + + // Indicate that this strand is executing on the current thread. + call_stack<strand_impl>::context ctx(impl); + + // Ensure the next handler, if any, is scheduled on block exit. + on_dispatch_exit on_exit = { &io_service_, impl }; + (void)on_exit; + + boost::asio::detail::fenced_block b; + boost_asio_handler_invoke_helpers::invoke(handler, handler); + return; + } + + // Immediate invocation is not allowed, so enqueue for later. + impl->queue_.push(p.p); + impl->mutex_.unlock(); + p.v = p.p = 0; + + // The first handler to be enqueued is responsible for scheduling the + // strand. + if (first) + io_service_.post_immediate_completion(impl); +} + +// Request the io_service to invoke the given handler and return immediately. +template <typename Handler> +void strand_service::post(strand_service::implementation_type& impl, + Handler handler) +{ + // Allocate and construct an operation to wrap the handler. + typedef completion_handler<Handler> op; + typename op::ptr p = { boost::addressof(handler), + boost_asio_handler_alloc_helpers::allocate( + sizeof(op), handler), 0 }; + p.p = new (p.v) op(handler); + + // Add the handler to the queue. + impl->mutex_.lock(); + bool first = (++impl->count_ == 1); + impl->queue_.push(p.p); + impl->mutex_.unlock(); + p.v = p.p = 0; + + // The first handler to be enqueue is responsible for scheduling the strand. + if (first) + io_service_.post_immediate_completion(impl); +} + +} // namespace detail +} // namespace asio +} // namespace boost + +#include <boost/asio/detail/pop_options.hpp> + +#endif // BOOST_ASIO_DETAIL_IMPL_STRAND_SERVICE_HPP |