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The shutdown server
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The shutdown server is the current architecture that is used to manage controlled shutdown in Symbian OS. Shutdown is typically initiated by a dedicated kernel-level component such as a device driver or kernel extension, or by the variant detecting a power button press, a power hotkey tap, the closing of the phone s cover, or some other mechanism. A user-side component may also initiate a shutdown sequence, by calling the UserSvr class exported API HalFunction(TInt aGroup, TInt aFunction, TAny* a1, TAny* a2) with EHalGroupPower as the identi er for the HAL group of functions and EPowerHalSwitchOff as the identi er for the function to execute. This could be used, for example, when the detection of the power key press is not done by a software component executing on the main application processor: instead the user-side component that is used as a communication channel to the baseband software will call the HalFunction API. The servicing of the UserSvr call is done by the platform-speci c part of the kernel power framework, as I explained in 15, Power Management. As a result of detecting the hardware event corresponding to the physical action, or servicing the UserSvr call as I have just described, a TRawEvent having one of the following types is added to the event queue: ESwitchOff added by the servicing of the UserSvr call EKeyOff added by the driver that detects the key presses ECaseClose added by the platform-speci c component that monitors the state of the phone s lid. The window server receives the event, and translates it into a TEventCode type: EEventSwitchOff in place of ESwitchOff EEventKeySwitchOff in place of EKeyOff EEventCaseClosed in place of ECaseClose. The window server will then either send the event to a registered component that requested it or, if no component is registered to receive off events, request the kernel to power down by calling UserHal::SwitchOff(). All current Symbian OS mobile phone have a UI component the Look And Feel, or LAF, shutdown manager that would previously have registered with the window server to receive such events. Implementing this policy in the UI allows the shutdown behavior of the phone to be customized according to the UI model it employs.
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OPERATING SYSTEM SHUTDOWN
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The shutdown manager object should derive from CLafShutdownManagerBase and implement a policy on when to shutdown the mobile phone.
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class CLafShutdownManagerBase : public CBase { protected: inline CLafShutdownManagerBase(MShutdownEventObserver& aObserver); protected: MShutdownEventObserver& iObserver; };
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The policy can involve listening for events such as the ones I have just listed, monitoring user inactivity using inactivity timers, and more. A typical implementation has the LAF shutdown manager opening a session with the window server at creation time and queuing a request for the noti cation of off events. When it does receive such an off event, the LAF shutdown manager decides if it should result in a power down or just the sending of state and data save noti cations to applications. The shutdown server is at the center of the shutdown architecture. It derives from MShutdownEventObserver, as follows:
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class MShutdownEventObserver { public: virtual void HandleShutdownEventL(MSaveObserver::TSaveType aAction, TBool aPowerOff)=0; virtual CArrayFix<TThreadId>* ClientArrayLC()=0; virtual TBool IsClientHung(TThreadId aId) const=0; virtual void GetShutdownState(TBool& aPowerOff, TBool& aAllSessionsHavePendingRequest) const=0; };
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The implementation of the mandatory API by a shutdown server enables the LAF shutdown manager to: Request the sending of save noti cations to registered components, possibly followed by a shutdown Return a list of registered clients Enquire if a registered client is still processing the save noti cation Obtain the shutdown status after a shutdown request has been issued. When the UI creates the shutdown server, the shutdown manager is also created and its iObserver member is set to reference the shutdown server.
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