Add random delay to AsyncTaskThread::execAsync in simulation

fdbclient/AsyncTaskThread.cpp

@@ -0,0 +1,23 @@
+/*
+ * AsyncTaskThread.cpp
+ *
+ * This source file is part of the FoundationDB open source project
+ *
+ * Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
+ *
+ * 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.
+ */
+
+#include "fdbclient/AsyncTaskThread.h"
+
+const double AsyncTaskThread::meanDelay = 0.01;

fdbclient/AsyncTaskThread.h

@@ -70,6 +70,8 @@ class AsyncTaskThread {
 		}
 	}
 
+	static const double meanDelay;
+
 public:
 	AsyncTaskThread() : thread([this] { run(this); }) {}
 
@@ -77,8 +79,7 @@ public:
 	auto execAsync(const F& func, TaskPriority priority = TaskPriority::DefaultOnMainThread)
 	    -> Future<decltype(func())> {
 		if (g_network->isSimulated()) {
-			// TODO: Add some random delay
-			return func();
+			return map(delayJittered(meanDelay), [func](Void _) { return func(); });
 		}
 		Promise<decltype(func())> promise;
 		addTask([&promise, &func, priority] {

fdbclient/CMakeLists.txt

@@ -1,9 +1,10 @@
 set(FDBCLIENT_SRCS
   AsyncFileBlobStore.actor.cpp
   AsyncFileBlobStore.actor.h
+  AsyncTaskThread.cpp
+  AsyncTaskThread.h
   Atomic.h
   AutoPublicAddress.cpp
-  AsyncTaskThread.h
   BackupAgent.actor.h
   BackupAgentBase.actor.cpp
   BackupContainer.actor.cpp