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+
+// Copyright Oliver Kowalke 2017.
+// 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_FIBERS_ALGO_NUMA_WORK_STEALING_H
+#define BOOST_FIBERS_ALGO_NUMA_WORK_STEALING_H
+
+#include <condition_variable>
+#include <chrono>
+#include <cstddef>
+#include <cstdint>
+#include <mutex>
+#include <vector>
+
+#include <boost/config.hpp>
+#include <boost/intrusive_ptr.hpp>
+
+#include <boost/fiber/algo/algorithm.hpp>
+#include <boost/fiber/context.hpp>
+#include <boost/fiber/detail/config.hpp>
+#include <boost/fiber/detail/context_spinlock_queue.hpp>
+#include <boost/fiber/detail/context_spmc_queue.hpp>
+#include <boost/fiber/numa/pin_thread.hpp>
+#include <boost/fiber/numa/topology.hpp>
+#include <boost/fiber/scheduler.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace fibers {
+namespace algo {
+namespace numa {
+
+class work_stealing : public algorithm {
+private:
+ static std::vector< intrusive_ptr< work_stealing > > schedulers_;
+
+ std::uint32_t cpu_id_;
+ std::vector< std::uint32_t > local_cpus_;
+ std::vector< std::uint32_t > remote_cpus_;
+#ifdef BOOST_FIBERS_USE_SPMC_QUEUE
+ detail::context_spmc_queue rqueue_{};
+#else
+ detail::context_spinlock_queue rqueue_{};
+#endif
+ std::mutex mtx_{};
+ std::condition_variable cnd_{};
+ bool flag_{ false };
+ bool suspend_;
+
+ static void init_( std::vector< boost::fibers::numa::node > const&,
+ std::vector< intrusive_ptr< work_stealing > > &);
+
+public:
+ work_stealing( std::uint32_t, std::uint32_t,
+ std::vector< boost::fibers::numa::node > const&,
+ bool = false);
+
+ work_stealing( work_stealing const&) = delete;
+ work_stealing( work_stealing &&) = delete;
+
+ work_stealing & operator=( work_stealing const&) = delete;
+ work_stealing & operator=( work_stealing &&) = delete;
+
+ virtual void awakened( context *) noexcept;
+
+ virtual context * pick_next() noexcept;
+
+ virtual context * steal() noexcept {
+ return rqueue_.steal();
+ }
+
+ virtual bool has_ready_fibers() const noexcept {
+ return ! rqueue_.empty();
+ }
+
+ virtual void suspend_until( std::chrono::steady_clock::time_point const&) noexcept;
+
+ virtual void notify() noexcept;
+};
+
+}}}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_FIBERS_ALGO_NUMA_WORK_STEALING_H