Wait properly for renderer crashes

ipc/ipc_channel.h

 // Copyright (c) 2011 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_CHANNEL_H_
 #define IPC_IPC_CHANNEL_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "ipc/ipc_channel_handle.h"
@@ skipping 128 matching lines @@
   // Send a message over the Channel to the listener on the other end.
   //
   // |message| must be allocated using operator new.  This object will be
   // deleted once the contents of the Message have been sent.
   virtual bool Send(Message* message);
 
 #if defined(OS_POSIX) && !defined(OS_NACL)
   // On POSIX an IPC::Channel wraps a socketpair(), this method returns the
   // FD # for the client end of the socket.
   // This method may only be called on the server side of a channel.
+  // This method can be called on any thread.
   int GetClientFileDescriptor() const;
 
+  // Same as GetClientFileDescriptor, but transfers the ownership of the
+  // file descriptor to the caller.
+  // This method can be called on any thread.
+  int TakeClientFileDescriptor();
+
   // On POSIX an IPC::Channel can either wrap an established socket, or it
   // can wrap a socket that is listening for connections. Currently an
   // IPC::Channel that listens for connections can only accept one connection
   // at a time.
 
   // Returns true if the channel supports listening for connections.
   bool AcceptsConnections() const;
 
   // Returns true if the channel supports listening for connections and is
   // currently connected.
@@ skipping 39 matching lines @@
     HELLO_MESSAGE_TYPE = kuint16max  // Maximum value of message type (uint16),
                                      // to avoid conflicting with normal
                                      // message types, which are enumeration
                                      // constants starting from 0.
   };
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_H_