1 files changed, 31 insertions, 0 deletions
diff --git a/pkg/sentry/time/clocks.go b/pkg/sentry/time/clocks.go
new file mode 100644
index 000000000..9925b407d
--- /dev/null
+++ b/pkg/sentry/time/clocks.go
@@ -0,0 +1,31 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// 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.
+
+package time
+
+// Clocks represents a clock source that contains both a monotonic and realtime
+// clock.
+type Clocks interface {
+	// Update performs an update step, keeping the clocks in sync with the
+	// reference host clocks, and returning the new timekeeping parameters.
+	//
+	// Update should be called at approximately ApproxUpdateInterval.
+	Update() (monotonicParams Parameters, monotonicOk bool, realtimeParam Parameters, realtimeOk bool)
+
+	// GetTime returns the current time in nanoseconds for the given clock.
+	//
+	// Clocks implementations must support at least Monotonic and
+	// Realtime.
+	GetTime(c ClockID) (int64, error)
+}