Add a sleep at the end of MessageQueue_WaitNotify to give the spawned

runtime/vm/message_queue_test.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/assert.h"
 #include "vm/message_queue.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
@@ skipping 119 matching lines @@
   OS::Sleep(5);
   for (int i = 0; i < 3; i++) {
     int* data = reinterpret_cast<int*>(malloc(sizeof(*data)));
     *data = i+2000;
     PortMessage* msg = new PortMessage(i+20, i+200, data);
     shared_queue->Enqueue(msg);
   }
 
   sync = NULL;
   delete sync;
+
+  // Give the spawned thread enough time to properly exit.
+  OS::Sleep(20);
 }
 
 
 TEST_CASE(MessageQueue_FlushAll) {
   MessageQueue queue;
   MessageQueueTestPeer queue_peer(&queue);
   Dart_Port port1 = 1;
   Dart_Port port2 = 2;
 
   // Add two messages.
@@ skipping 64 matching lines @@
 
   EXPECT(!queue_peer.HasMessage());
   queue.Flush(port1);
 
   // Queue is still empty.
   EXPECT(!queue_peer.HasMessage());
 }
 
 
 }  // namespace dart