Multiple sync channels if used in the same listener thread could result in ca...

ipc/ipc_sync_channel.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef IPC_IPC_SYNC_SENDER_H__
 #define IPC_IPC_SYNC_SENDER_H__
 
 #include <string>
 #include <deque>
 
@@ skipping 74 matching lines @@
     // synchronous send.  If it is, the thread is unblocked and true is
     // returned. Otherwise the function returns false.
     bool TryToUnblockListener(const Message* msg);
 
     // Called on the IPC thread when a sync send that runs a nested message loop
     // times out.
     void OnSendTimeout(int message_id);
 
     base::WaitableEvent* shutdown_event() { return shutdown_event_; }
 
+    ReceivedSyncMsgQueue* received_sync_msgs() {
+      return received_sync_msgs_;
+    }
+
    private:
     // IPC::ChannelProxy methods that we override.
 
     // Called on the listener thread.
    virtual void Clear();
 
     // Called on the IPC thread.
     virtual void OnMessageReceived(const Message& msg);
     virtual void OnChannelError();
     virtual void OnChannelOpened();
@@ skipping 39 matching lines @@
   // latter one also runs a nested message loop in the meantime.
   void WaitForReply(base::WaitableEvent* pump_messages_event);
 
   // Runs a nested message loop until a reply arrives, times out, or the process
   // shuts down.
   void WaitForReplyWithNestedMessageLoop();
 
   bool sync_messages_with_no_timeout_allowed_;
 
   // Used to signal events between the IPC and listener threads.
-  base::WaitableEventWatcher send_done_watcher_;
   base::WaitableEventWatcher dispatch_watcher_;
 
   DISALLOW_EVIL_CONSTRUCTORS(SyncChannel);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_SYNC_SENDER_H__