1 files changed, 82 insertions, 0 deletions
diff --git a/boost/fiber/algo/work_stealing.hpp b/boost/fiber/algo/work_stealing.hpp
new file mode 100644
index 0000000000..12364ece8c
--- /dev/null
+++ b/boost/fiber/algo/work_stealing.hpp
@@ -0,0 +1,82 @@
+
+//          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_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:
+    typedef scheduler::ready_queue_t lqueue_t;
+
+    static std::vector< work_stealing * >        schedulers_;
+
+    std::size_t                                     idx_;
+    std::size_t                                     max_idx_;
+    detail::context_spmc_queue                      rqueue_{};
+    lqueue_t                                        lqueue_{};
+    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_.pop();
+    }
+
+    bool has_ready_fibers() const noexcept {
+        return ! rqueue_.empty() || ! lqueue_.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