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16.2.3.3 E32START
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File server initialization proceeds as normal, the last action being to create a new process from the E32STRT.EXE image. This is the emulator equivalent of the ESTART.EXE that I describe in 16. It carries out the same initialization tasks, but provides some additional features for the emulator. E32STRT determines which UI to run based on its con guration properties: it can run the graphical window server, the text shell or run without any UI at all. E32STRT then checks to see how the emulator was bootstrapped. If it was started by EPOC.EXE, it exits leaving the UI to run and the emulator boot has completed. If not, it retrieves the program and command line to auto-execute from the AutoRun and CommandLine properties, creates that process, waits for it to exit and after that terminates the emulator. This latter course of action gives the same behavior that you see in the EKA1 emulator when you run an EXE from the Windows command line.
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Operating system shutdown
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Now that I have covered startup, I will move on to describe its opposite: shutdown. From the user s point of view, startup and shutdown are symmetrical activities. From the software perspective, there is little in common: Startup is a baton-passing exercise, which takes the mobile phone from a primordial state to one where all services are running, in a
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OPERATING SYSTEM SHUTDOWN
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carefully sequenced procession. This sequence is a consequence of the system design and our main interest lies in how it is achieved Conversely, shutdown is an activity which must be orchestrated, bringing the running system to a state in which it is safe to pull the plug and remove power. I will discuss some design details here to help explain the way in which shutdown is managed. Shutdown which involves shutting down the phone, closing all open applications and saving data that has changed in the current session is normally initiated by a user action, such as pressing a power button or a power-off key. Shutdown also occurs in response to other user or network based activities: Restoring data from a backup can invalidate much of the OS state: it is easier to restart the entire system than to synchronize all system services with the new con guration data Firmware over the air (FOTA) update. In-place update of the Symbian OS rmware requires that Symbian OS is not executing at the time. Once the update is downloaded to the phone, the phone will need to restart in update mode. In all of these scenarios, the shutdown can be managed in an orderly way to ensure that persistent data is saved correctly. Sometimes, however, the cause of shutdown is less controlled. For example, some software faults in critical system services are unrecoverable and result in an immediate software reset. Or, a loss of power results in a very rapid shutdown of the system, even though a little residual power is available to complete critical disk activities. In such cases the startup process must make its best effort to recover the state of the data on the mobile phone, and repair any problems that it discovers. Some of this work is done in ESTART as it mounts the le systems if the system did not shutdown cleanly, it can check for errors in the le system and may even reformat the le system if it cannot be repaired. System shutdown may result in critical hardware components such as the CPU and most peripherals having their power removed (transition to the off state) or it may leave these components in a standby state, from which it is possible to return to an operational (active) state without rebooting. There are currently two architectures available that can be used to manage shutdown of the entire OS. The shutdown server is used in phones today, whereas the domain manager is a new component that will eventually replace the shutdown server in this role. I will look at the design of both these architectures.
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