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// Copyright Oliver Kowalke 2015.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_FIBERS_ALGO_WORK_STEALING_H
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#define BOOST_FIBERS_ALGO_WORK_STEALING_H
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#include <atomic>
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#include <condition_variable>
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#include <chrono>
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#include <cstddef>
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#include <cstdint>
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#include <mutex>
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#include <vector>
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#include <boost/config.hpp>
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#include <boost/intrusive_ptr.hpp>
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#include <boost/fiber/algo/algorithm.hpp>
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#include <boost/fiber/context.hpp>
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#include <boost/fiber/detail/config.hpp>
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#include <boost/fiber/detail/context_spinlock_queue.hpp>
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#include <boost/fiber/detail/context_spmc_queue.hpp>
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#include <boost/fiber/scheduler.hpp>
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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namespace boost {
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namespace fibers {
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namespace algo {
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class BOOST_FIBERS_DECL work_stealing : public algorithm {
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private:
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static std::atomic< std::uint32_t > counter_;
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static std::vector< intrusive_ptr< work_stealing > > schedulers_;
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std::uint32_t id_;
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std::uint32_t thread_count_;
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#ifdef BOOST_FIBERS_USE_SPMC_QUEUE
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detail::context_spmc_queue rqueue_{};
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#else
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detail::context_spinlock_queue rqueue_{};
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#endif
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std::mutex mtx_{};
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std::condition_variable cnd_{};
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bool flag_{ false };
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bool suspend_;
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static void init_( std::uint32_t, std::vector< intrusive_ptr< work_stealing > > &);
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public:
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work_stealing( std::uint32_t, bool = false);
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work_stealing( work_stealing const&) = delete;
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work_stealing( work_stealing &&) = delete;
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work_stealing & operator=( work_stealing const&) = delete;
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work_stealing & operator=( work_stealing &&) = delete;
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void awakened( context *) noexcept override;
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context * pick_next() noexcept override;
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virtual context * steal() noexcept {
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return rqueue_.steal();
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}
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bool has_ready_fibers() const noexcept override {
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return ! rqueue_.empty();
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}
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void suspend_until( std::chrono::steady_clock::time_point const&) noexcept override;
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void notify() noexcept override;
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};
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}}}
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_SUFFIX
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#endif
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#endif // BOOST_FIBERS_ALGO_WORK_STEALING_H
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