User MessageLoopForIO::WatchFileDescriptor in proces_output_watcher

chromeos/process_proxy/process_proxy_registry.h

 // 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.
 
 #ifndef CHROMEOS_PROCESS_PROXY_PROCESS_PROXY_REGISTRY_H_
 #define CHROMEOS_PROCESS_PROXY_PROCESS_PROXY_REGISTRY_H_
 
 #include <map>
+#include <string>
 
 #include "base/callback.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/threading/thread.h"
 #include "chromeos/chromeos_export.h"
 #include "chromeos/process_proxy/process_proxy.h"
 
 namespace chromeos {
 
 typedef base::Callback<void(pid_t, const std::string&, const std::string&)>
       ProcessOutputCallbackWithPid;
 
 // Keeps track of all created ProcessProxies. It is created lazily and should
 // live on a single thread (where all methods must be called).
 class CHROMEOS_EXPORT ProcessProxyRegistry : public base::NonThreadSafe {
  public:
   // Info we need about a ProcessProxy instance.
   struct ProcessProxyInfo {
     scoped_refptr<ProcessProxy> proxy;
-    scoped_ptr<base::Thread> watcher_thread;
     ProcessOutputCallbackWithPid callback;
     pid_t process_id;
 
     ProcessProxyInfo();
     // This is to make map::insert happy, we don't init anything.
     ProcessProxyInfo(const ProcessProxyInfo& other);
     ~ProcessProxyInfo();
   };
 
   static ProcessProxyRegistry* Get();
 
   // Starts new ProcessProxy (which starts new process).
   bool OpenProcess(const std::string& command, pid_t* pid,
                    const ProcessOutputCallbackWithPid& callback);
   // Sends data to the process with id |pid|.
   bool SendInput(pid_t pid, const std::string& data);
   // Stops the process with id |pid|.
   bool CloseProcess(pid_t pid);
   // Reports terminal resize to process proxy.
   bool OnTerminalResize(pid_t pid, int width, int height);
 
+  // Shuts down registry, closing all associated processed.
+  void ShutDown();
+
   // Currently used for testing.
   void SetOutputCallback(const ProcessOutputCallback& callback);
 
  private:
   friend struct ::base::DefaultLazyInstanceTraits<ProcessProxyRegistry>;
 
   ProcessProxyRegistry();
   ~ProcessProxyRegistry();
 
   // Gets called when output gets detected.
   void OnProcessOutput(pid_t pid,
                        ProcessOutputType type,
                        const std::string& data);
 
+  bool EnsureWatcherThreadStarted();
+
   // Map of all existing ProcessProxies.
   std::map<pid_t, ProcessProxyInfo> proxy_map_;
 
+  scoped_ptr<base::Thread> watcher_thread_;
+
   DISALLOW_COPY_AND_ASSIGN(ProcessProxyRegistry);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_PROCESS_PROXY_PROCESS_PROXY_REGISTRY_H_