Fix a TSAN failure of QUIC's EndToEndTest where the value of

net/tools/quic/end_to_end_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <string>
 #include <sys/epoll.h>
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 286 matching lines @@
 
   void SetReorderPercentage(int32 reorder) {
     // TODO(rtenneti): enable when we can do random packet reorder tests in
     // chrome's tree.
     // client_writer_->set_fake_reorder_percentage(reorder);
     // server_writer_->set_fake_reorder_percentage(reorder);
   }
 
   // Verifies that the client and server connections were both free of packets
   // being discarded, based on connection stats.
+  // Calls server_thread_ Pause() and Resume(), which may only be called once
+  // per test.
   void VerifyCleanConnection(bool had_packet_loss) {
     QuicConnectionStats client_stats =
         client_->client()->session()->connection()->GetStats();
     if (!had_packet_loss) {
       EXPECT_EQ(0u, client_stats.packets_lost);
     }
     EXPECT_EQ(0u, client_stats.packets_discarded);
     EXPECT_EQ(0u, client_stats.packets_dropped);
     EXPECT_EQ(client_stats.packets_received, client_stats.packets_processed);
 
+    server_thread_->Pause();
     QuicDispatcher* dispatcher =
         QuicServerPeer::GetDispatcher(server_thread_->server());
     ASSERT_EQ(1u, dispatcher->session_map().size());
     QuicSession* session = dispatcher->session_map().begin()->second;
     QuicConnectionStats server_stats = session->connection()->GetStats();
     if (!had_packet_loss) {
       EXPECT_EQ(0u, server_stats.packets_lost);
     }
     EXPECT_EQ(0u, server_stats.packets_discarded);
     // TODO(ianswett): Restore the check for packets_dropped equals 0.
     // The expect for packets received is equal to packets processed fails
     // due to version negotiation packets.
+    server_thread_->Resume();
   }
 
   IPEndPoint server_address_;
   string server_hostname_;
   scoped_ptr<ServerThread> server_thread_;
   scoped_ptr<QuicTestClient> client_;
   PacketDroppingTestWriter* client_writer_;
   PacketDroppingTestWriter* server_writer_;
   bool server_started_;
   QuicConfig client_config_;
@@ skipping 650 matching lines @@
   QuicSession* session = dispatcher->session_map().begin()->second;
   EXPECT_EQ(kClientIFCW,
             session->config()->ReceivedInitialFlowControlWindowBytes());
   server_thread_->Resume();
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace tools
 }  // namespace net