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+//
+// system_context.hpp
+// ~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2021 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 ASIO_SYSTEM_CONTEXT_HPP
+#define ASIO_SYSTEM_CONTEXT_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/detail/scheduler.hpp"
+#include "asio/detail/thread_group.hpp"
+#include "asio/execution.hpp"
+#include "asio/execution_context.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+
+template <typename Blocking, typename Relationship, typename Allocator>
+class basic_system_executor;
+
+/// The executor context for the system executor.
+class system_context : public execution_context
+{
+public:
+ /// The executor type associated with the context.
+ typedef basic_system_executor<
+ execution::blocking_t::possibly_t,
+ execution::relationship_t::fork_t,
+ std::allocator<void>
+ > executor_type;
+
+ /// Destructor shuts down all threads in the system thread pool.
+ ASIO_DECL ~system_context();
+
+ /// Obtain an executor for the context.
+ executor_type get_executor() ASIO_NOEXCEPT;
+
+ /// Signal all threads in the system thread pool to stop.
+ ASIO_DECL void stop();
+
+ /// Determine whether the system thread pool has been stopped.
+ ASIO_DECL bool stopped() const ASIO_NOEXCEPT;
+
+ /// Join all threads in the system thread pool.
+ ASIO_DECL void join();
+
+#if defined(GENERATING_DOCUMENTATION)
+private:
+#endif // defined(GENERATING_DOCUMENTATION)
+ // Constructor creates all threads in the system thread pool.
+ ASIO_DECL system_context();
+
+private:
+ template <typename, typename, typename> friend class basic_system_executor;
+
+ struct thread_function;
+
+ // Helper function to create the underlying scheduler.
+ ASIO_DECL detail::scheduler& add_scheduler(detail::scheduler* s);
+
+ // The underlying scheduler.
+ detail::scheduler& scheduler_;
+
+ // The threads in the system thread pool.
+ detail::thread_group threads_;
+
+ // The number of threads in the pool.
+ std::size_t num_threads_;
+};
+
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#include "asio/impl/system_context.hpp"
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/impl/system_context.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // ASIO_SYSTEM_CONTEXT_HPP