Revert 34146 - A place to store the pid>mach_port_t mapping....

chrome/browser/mach_broker_mac.h

-// Copyright (c) 2009 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 CHROME_BROWSER_MACH_BROKER_H_
-#define CHROME_BROWSER_MACH_BROKER_H_
-
-#include <map>
-
-#include <mach/mach.h>
-
-#include "base/lock.h"
-#include "base/process.h"
-#include "base/singleton.h"
-
-// On OS X, the mach_port_t of a process is required to collect metrics about
-// the process. Running |task_for_pid()| is only allowed for priviledged code.
-// However, a process has port rights to all its subprocesses, so let the
-// browser's child processes send their mach_port_t to the browser over IPC.
-// This way, the brower can at least collect metrics of its child processes,
-// which is what it's most interested in anyway.
-//
-// mach_port_ts can only be sent over mach ipc, not over the socketpair that
-// the regular ipc system uses. Hence, the child processes open a mach
-// connection shortly after launching and ipc their mach data to the browser
-// process. This data is kept in a global |MachBroker| object.
-//
-// Due to this data arriving over a separate channel, it is not available
-// immediately after a child process has been started.
-class MachBroker {
- public:
-  // Returns the global MachBroker.
-  static MachBroker* instance();
-
-  // Returns the mach task belonging to |pid|, or 0 if no mach task is
-  // registered for |pid|.
-  mach_port_t MachTaskForPid(base::ProcessHandle pid) const;
-
-  // Returns the mach host belonging to |pid|, or 0 if no mach task is
-  // registered for |pid|.
-  mach_port_t MachHostForPid(base::ProcessHandle pid) const;
-
-  struct MachInfo {
-    MachInfo() : mach_task_(0), mach_host_(0) {}
-
-    MachInfo& SetTask(mach_port_t task) {
-      mach_task_ = task;
-      return *this;
-    }
-
-    MachInfo& SetHost(mach_port_t host) {
-      mach_host_ = host;
-      return *this;
-    }
-
-    mach_port_t mach_task_;
-    mach_port_t mach_host_;
-  };
-
-  // Adds mach info for a given pid.
-  void RegisterPid(base::ProcessHandle pid, const MachInfo& mach_info);
-
-  // Removes all mappings belonging to |pid| from the broker.
-  void Invalidate(base::ProcessHandle pid);
-
- private:
-  // Private constructor.
-  MachBroker();
-  friend struct DefaultSingletonTraits<MachBroker>;
-  friend class MachBrokerTest;
-
-  // Stores
-  typedef std::map<base::ProcessHandle, MachInfo> MachMap;
-  MachMap mach_map_;
-
-  // Mutex that guards |mach_map_|.
-  mutable Lock lock_;
-};
-
-#endif  // CHROME_BROWSER_MACH_BROKER_H_
-