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Software components that need to be noti ed of an imminent shutdown create sessions with the shutdown server to receive save noti cations. An example of such a component is a UI-speci c save observer, which acts as a gateway for save/shutdown noti cations on behalf of UI applications. Upon receiving a save noti cation, a save observer propagates the request to all running applications which will then save their data/status, close dialogs, exit, and so on. The noti cation mechanism is based on an asynchronous request, which is placed on the shutdown server when a client creates a session with it. Clients of the shutdown server typically own a CSaveNotifier object that provides them with an interface to the shutdown server:
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class CSaveNotifier : public CActive { public: IMPORT_C static CSaveNotifier* NewL(MSaveObserver& aObserver); IMPORT_C CSaveNotifier(); IMPORT_C void DelayRequeue(); IMPORT_C void Queue(); IMPORT_C void HandleError(TInt aError); ... };
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The API allows for: Creating a session with the shutdown server that will queue an asynchronous request for shutdown noti cation Closing the session and canceling a pending request Delaying or stopping a shutdown sequence after the client received the noti cation, and resuming the sequence Notifying the shutdown server of an error in its internal save/shutdown sequence. Clients of the shutdown server must also implement an MSaveObserver interface:
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class MSaveObserver { public: enum TSaveType { ESaveNone, ESaveData, ESaveAll, ESaveQuick, EReleaseRAM,
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EReleaseDisk, }; public: virtual void SaveL(TSaveType aSaveType)=0; };
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Thus, when noti ed of an off event, the LAF shutdown manager calls the shutdown server s HandleShutdownEventL() API, specifying if a power down is required and specifying what save action is required from its clients (as a TSaveType). The LAF shutdown manager may also do this as a result of detecting a period of user inactivity. The shutdown server manages the shutdown sequence. The servicing of HandleShutdownEventL() saves the locale and HAL settings that may have changed during the current session and, if a saving action of any type is required, noti es all registered clients that have pending save noti cation requests, by completing those requests. If a registered client does not yet have a pending request, then it will be noti ed immediately after it issues the request for noti cation. After receiving a save noti cation, clients of the shutdown server call the SaveL() method (from MSaveObserver) which will perform clientspeci c status saving actions corresponding to the TSaveType argument passed. Clients must then re-queue a request with the shutdown server. If a power down is required, the shutdown server will ask the kernel to shutdown only after all its clients have re-queued requests with it. The shutdown server requests kernel shutdown by invoking the UserHal::SwitchOff() API (an export from EUSER.DLL):
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EXPORT_C TInt UserHal::SwitchOff() { TInt r = Power::EnableWakeupEvents(EPwStandby); if(r!=KErrNone) return r; TRequestStatus s; Power::RequestWakeupEventNotification(s); Power::PowerDown(); User::WaitForRequest(s); return s.Int(); }
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This entire sequence is illustrated in Figure 16.4. I have already discussed the Power class APIs invoked by this function in 15, Power Management. Be sure to note that: The target power state selected by UserHal::SwitchOff() is standby, as was the case with the EKA1 power management. However, as the implementation of Power::PowerDown() will call down to platform-speci c code, phone manufacturers can interpret this
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Kern::AddEvent(EKeyOff)
Shutdown Server
UserHal::SwitchOff
Device driver
Kernel Power Manager
Figure 16.4 Flow of activity after a power off event
request by powering down the hardware (CPU, peripherals) instead of transitioning them to a standby state The new shutdown architecture using the domain manager (discussed in the following section) leaves the choice of target power state to the LAF domain controller Wakeup events are enabled but, if they occur they have no impact on the transition once initiated.