Changing the Priority

This section describes how an application (internal or third-party) can change its priority by using OOM Monitor APIs.

An application which is processing a task in the background can change its priority at runtime to protect itself from being closed by the OOM Monitor. For example:

  • Music Player playing music in the background

  • Download Manager downloading a file in the background

If an application is processing a task for the user in the background, the application is said to be Busy and the OOM Monitor must not close a Busy application. An application can declare itself to be Busy using ROomMonitorSession::SetOomPriority(EOomPriorityBusy) method. When the application finishes its background job and becomes idle, it should change its priority to Normal.

  1. Create an OOM Monitor session 
    ROomMonitorSession ioomMonitorSession;
CleanUpClosePushL(ioomMonitorSession);
User::LeaveIfError(ioomMonitorSession.Connect());
  2. Set the priority for the application to Busy before performing the background task 
    iOomMonitorSession.SetOomPriority(ROomMonitorSession::EOomPriorityBusy);
DoCriticalBackgroundProcessingL();
  3. Set the priority for the application to Normal after the task is completed. 
    iOomMonitorSession.SetOomPriority(ROomMonitorSession::EOomPriorityNormal);
  4. Close the session. 
    iOomMonitorSession.Close();
Parent topic: Using OOM Monitor

Related concepts

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