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// Copyright Oliver Kowalke 2015.
// 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_WORK_STEALING_H
#define BOOST_FIBERS_ALGO_WORK_STEALING_H
#include <condition_variable>
#include <chrono>
#include <cstddef>
#include <mutex>
#include <vector>
#include <boost/config.hpp>
#include <boost/fiber/algo/algorithm.hpp>
#include <boost/fiber/detail/context_spinlock_queue.hpp>
#include <boost/fiber/detail/context_spmc_queue.hpp>
#include <boost/fiber/context.hpp>
#include <boost/fiber/detail/config.hpp>
#include <boost/fiber/scheduler.hpp>
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
namespace boost {
namespace fibers {
namespace algo {
class work_stealing : public algorithm {
private:
static std::vector< work_stealing * > schedulers_;
std::size_t idx_;
std::size_t max_idx_;
#ifdef BOOST_FIBERS_USE_SPMC_QUEUE
alignas(cache_alignment) detail::context_spmc_queue rqueue_{};
#else
alignas(cache_alignment) detail::context_spinlock_queue rqueue_{};
#endif
std::mutex mtx_{};
std::condition_variable cnd_{};
bool flag_{ false };
bool suspend_;
static void init_( std::size_t max_idx);
public:
work_stealing( std::size_t max_idx, std::size_t idx, bool suspend = 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;
void awakened( context * ctx) noexcept;
context * pick_next() noexcept;
context * steal() noexcept {
return rqueue_.steal();
}
bool has_ready_fibers() const noexcept {
return ! rqueue_.empty();
}
void suspend_until( std::chrono::steady_clock::time_point const& time_point) noexcept;
void notify() noexcept;
};
}}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#endif // BOOST_FIBERS_ALGO_WORK_STEALING_H
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