1 files changed, 51 insertions, 0 deletions
diff --git a/src/seastar/include/seastar/core/manual_clock.hh b/src/seastar/include/seastar/core/manual_clock.hh
new file mode 100644
index 000000000..34bc5bec1
--- /dev/null
+++ b/src/seastar/include/seastar/core/manual_clock.hh
@@ -0,0 +1,51 @@
+/*
+ * This file is open source software, licensed to you under the terms
+ * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
+ * distributed with this work for additional information regarding copyright
+ * ownership.  You may not use this file except in compliance with the License.
+ *
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+ * Copyright (C) 2016 ScyllaDB
+ */
+
+#pragma once
+
+#include <seastar/core/timer.hh>
+
+#include <atomic>
+#include <chrono>
+
+namespace seastar {
+
+class manual_clock {
+public:
+    using rep = int64_t;
+    using period = std::chrono::nanoseconds::period;
+    using duration = std::chrono::duration<rep, period>;
+    using time_point = std::chrono::time_point<manual_clock, duration>;
+private:
+    static std::atomic<rep> _now;
+    static void expire_timers() noexcept;
+public:
+    manual_clock() noexcept;
+    static time_point now() noexcept {
+        return time_point(duration(_now.load(std::memory_order_relaxed)));
+    }
+    static void advance(duration d) noexcept;
+};
+
+extern template class timer<manual_clock>;
+
+}
+