Update boost to 1.71 and add asio

boost/asio/impl/thread_pool.hpp

@@ -0,0 +1,129 @@
+//
+// impl/thread_pool.hpp
+// ~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2019 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_IMPL_THREAD_POOL_HPP
+#define BOOST_ASIO_IMPL_THREAD_POOL_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/executor_op.hpp>
+#include <boost/asio/detail/fenced_block.hpp>
+#include <boost/asio/detail/recycling_allocator.hpp>
+#include <boost/asio/detail/type_traits.hpp>
+#include <boost/asio/execution_context.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+
+inline thread_pool::executor_type
+thread_pool::get_executor() BOOST_ASIO_NOEXCEPT
+{
+  return executor_type(*this);
+}
+
+inline thread_pool&
+thread_pool::executor_type::context() const BOOST_ASIO_NOEXCEPT
+{
+  return pool_;
+}
+
+inline void
+thread_pool::executor_type::on_work_started() const BOOST_ASIO_NOEXCEPT
+{
+  pool_.scheduler_.work_started();
+}
+
+inline void thread_pool::executor_type::on_work_finished()
+const BOOST_ASIO_NOEXCEPT
+{
+  pool_.scheduler_.work_finished();
+}
+
+template <typename Function, typename Allocator>
+void thread_pool::executor_type::dispatch(
+    BOOST_ASIO_MOVE_ARG(Function) f, const Allocator& a) const
+{
+  typedef typename decay<Function>::type function_type;
+
+  // Invoke immediately if we are already inside the thread pool.
+  if (pool_.scheduler_.can_dispatch())
+  {
+    // Make a local, non-const copy of the function.
+    function_type tmp(BOOST_ASIO_MOVE_CAST(Function)(f));
+
+    detail::fenced_block b(detail::fenced_block::full);
+    boost_asio_handler_invoke_helpers::invoke(tmp, tmp);
+    return;
+  }
+
+  // Allocate and construct an operation to wrap the function.
+  typedef detail::executor_op<function_type, Allocator> op;
+  typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
+  p.p = new (p.v) op(BOOST_ASIO_MOVE_CAST(Function)(f), a);
+
+  BOOST_ASIO_HANDLER_CREATION((pool_, *p.p,
+        "thread_pool", &this->context(), 0, "dispatch"));
+
+  pool_.scheduler_.post_immediate_completion(p.p, false);
+  p.v = p.p = 0;
+}
+
+template <typename Function, typename Allocator>
+void thread_pool::executor_type::post(
+    BOOST_ASIO_MOVE_ARG(Function) f, const Allocator& a) const
+{
+  typedef typename decay<Function>::type function_type;
+
+  // Allocate and construct an operation to wrap the function.
+  typedef detail::executor_op<function_type, Allocator> op;
+  typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
+  p.p = new (p.v) op(BOOST_ASIO_MOVE_CAST(Function)(f), a);
+
+  BOOST_ASIO_HANDLER_CREATION((pool_, *p.p,
+        "thread_pool", &this->context(), 0, "post"));
+
+  pool_.scheduler_.post_immediate_completion(p.p, false);
+  p.v = p.p = 0;
+}
+
+template <typename Function, typename Allocator>
+void thread_pool::executor_type::defer(
+    BOOST_ASIO_MOVE_ARG(Function) f, const Allocator& a) const
+{
+  typedef typename decay<Function>::type function_type;
+
+  // Allocate and construct an operation to wrap the function.
+  typedef detail::executor_op<function_type, Allocator> op;
+  typename op::ptr p = { detail::addressof(a), op::ptr::allocate(a), 0 };
+  p.p = new (p.v) op(BOOST_ASIO_MOVE_CAST(Function)(f), a);
+
+  BOOST_ASIO_HANDLER_CREATION((pool_, *p.p,
+        "thread_pool", &this->context(), 0, "defer"));
+
+  pool_.scheduler_.post_immediate_completion(p.p, true);
+  p.v = p.p = 0;
+}
+
+inline bool
+thread_pool::executor_type::running_in_this_thread() const BOOST_ASIO_NOEXCEPT
+{
+  return pool_.scheduler_.can_dispatch();
+}
+
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_IMPL_THREAD_POOL_HPP