Wait properly for renderer crashes

ipc/ipc_channel_posix.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_POSIX_H_
 #define IPC_IPC_CHANNEL_POSIX_H_
 #pragma once
 
 #include "ipc/ipc_channel.h"
 
@@ skipping 39 matching lines @@
 class Channel::ChannelImpl : public MessageLoopForIO::Watcher {
  public:
   // Mirror methods of Channel, see ipc_channel.h for description.
   ChannelImpl(const IPC::ChannelHandle& channel_handle, Mode mode,
               Listener* listener);
   virtual ~ChannelImpl();
   bool Connect();
   void Close();
   void set_listener(Listener* listener) { listener_ = listener; }
   bool Send(Message* message);
-  int GetClientFileDescriptor() const;
+  int GetClientFileDescriptor();
+  int TakeClientFileDescriptor();
+  void CloseClientFileDescriptor();
   bool AcceptsConnections() const;
   bool HasAcceptedConnection() const;
   bool GetClientEuid(uid_t* client_euid) const;
   void ResetToAcceptingConnectionState();
   static bool IsNamedServerInitialized(const std::string& channel_id);
 #if defined(OS_LINUX)
   static void SetGlobalPid(int pid);
 #endif  // OS_LINUX
 
  private:
@@ skipping 31 matching lines @@
   // File descriptor we're listening on for new connections if we listen
   // for connections.
   int server_listen_pipe_;
 
   // The pipe used for communication.
   int pipe_;
 
   // For a server, the client end of our socketpair() -- the other end of our
   // pipe_ that is passed to the client.
   int client_pipe_;
+  base::Lock client_pipe_lock_;  // Lock that protects |client_pipe_|.
 
 #if defined(IPC_USES_READWRITE)
   // Linux/BSD use a dedicated socketpair() for passing file descriptors.
   int fd_pipe_;
   int remote_fd_pipe_;
 #endif
 
   // The "name" of our pipe.  On Windows this is the global identifier for
   // the pipe.  On POSIX it's used as a key in a local map of file descriptors.
   std::string pipe_name_;
@@ skipping 38 matching lines @@
 
 // The maximum length of the name of a pipe for MODE_NAMED_SERVER or
 // MODE_NAMED_CLIENT if you want to pass in your own socket.
 // The standard size on linux is 108, mac is 104. To maintain consistency
 // across platforms we standardize on the smaller value.
 static const size_t kMaxPipeNameLength = 104;
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_POSIX_H_