| // 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/process_util.h" |
| #include "base/singleton.h" |
| #include "chrome/common/notification_registrar.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 privileged code. |
| // However, a process has port rights to all its subprocesses, so let the |
| // browser's child processes send their Mach port 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 ports 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. |
| // |
| // Since this data arrives over a separate channel, it is not available |
| // immediately after a child process has been started. |
| class MachBroker : public base::ProcessMetrics::PortProvider, |
| public NotificationObserver { |
| public: |
| // Returns the global MachBroker. |
| static MachBroker* instance(); |
| |
| struct MachInfo { |
| MachInfo() : mach_task_(MACH_PORT_NULL) {} |
| |
| MachInfo& SetTask(mach_port_t task) { |
| mach_task_ = task; |
| return *this; |
| } |
| |
| mach_port_t mach_task_; |
| }; |
| |
| // 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); |
| |
| // Implement |ProcessMetrics::PortProvider|. |
| virtual mach_port_t TaskForPid(base::ProcessHandle process) const; |
| |
| // Implement |NotificationObserver|. |
| virtual void Observe(NotificationType type, |
| const NotificationSource& source, |
| const NotificationDetails& details); |
| private: |
| // Private constructor. |
| MachBroker(); |
| |
| // Used to register for notifications received by NotificationObserver. |
| // Accessed only on the UI thread. |
| NotificationRegistrar registrar_; |
| |
| friend struct DefaultSingletonTraits<MachBroker>; |
| friend class MachBrokerTest; |
| |
| // Stores mach info for every process in the broker. |
| typedef std::map<base::ProcessHandle, MachInfo> MachMap; |
| MachMap mach_map_; |
| |
| // Mutex that guards |mach_map_|. |
| mutable Lock lock_; |
| |
| friend class RegisterNotificationTask; |
| DISALLOW_COPY_AND_ASSIGN(MachBroker); |
| }; |
| |
| #endif // CHROME_BROWSER_MACH_BROKER_H_ |
| |