feat():initial version

install/boost_1_75_0/include/boost/fiber/waker.hpp

@@ -0,0 +1,88 @@
+#ifndef BOOST_FIBERS_WAKER_H
+#define BOOST_FIBERS_WAKER_H
+
+#include <cstddef>
+
+#include <boost/config.hpp>
+#include <boost/fiber/detail/config.hpp>
+#include <boost/fiber/detail/spinlock.hpp>
+#include <boost/intrusive/slist.hpp>
+
+namespace boost {
+namespace fibers {
+
+class context;
+
+namespace detail {
+
+typedef intrusive::slist_member_hook<> waker_queue_hook;
+
+} // detail
+
+
+class BOOST_FIBERS_DECL waker {
+private:
+    context *ctx_{};
+    size_t epoch_{};
+
+public:
+    friend class context;
+
+    waker() = default;
+
+    waker(context * ctx, const size_t epoch)
+        : ctx_{ ctx }
+        , epoch_{ epoch }
+    {}
+
+    bool wake() const noexcept;
+};
+
+
+class BOOST_FIBERS_DECL waker_with_hook : public waker {
+public:
+    explicit waker_with_hook(waker && w)
+        : waker{ std::move(w) }
+    {}
+
+    bool is_linked() const noexcept {
+        return waker_queue_hook_.is_linked();
+    }
+
+    friend bool
+    operator==( waker const& lhs, waker const& rhs) noexcept {
+        return & lhs == & rhs;
+    }
+
+public:
+    detail::waker_queue_hook waker_queue_hook_{};
+};
+
+namespace detail {
+    typedef intrusive::slist<
+            waker_with_hook,
+            intrusive::member_hook<
+                waker_with_hook, detail::waker_queue_hook, & waker_with_hook::waker_queue_hook_ >,
+            intrusive::constant_time_size< false >,
+            intrusive::cache_last< true >
+        >                                               waker_slist_t;
+}
+
+class BOOST_FIBERS_DECL wait_queue {
+private:
+    detail::waker_slist_t   slist_{};
+
+public:
+    void suspend_and_wait( detail::spinlock_lock &, context *);
+    bool suspend_and_wait_until( detail::spinlock_lock &,
+                                 context *,
+                                 std::chrono::steady_clock::time_point const&);
+    void notify_one();
+    void notify_all();
+
+    bool empty() const;
+};
+
+}}
+
+#endif // BOOST_FIBERS_WAKER_H