4.1. Operating Systems and SCSI I/O
One function of an operating system is to hide the complexity of the computing environment from the end user. Management of system resources including memory, peripheral devices, display, context switching between concurrent applications, and so on, are generally concealed behind the user interface. How successfully this is accomplished varies from one operating system to another, but the failure to perform may result in the loss of transient data, reboot of hung applications, reboot of the system itself, and invariably a disgruntled end user. The internal operations of the operating system must be robust, closely monitor changes of state, ensure that transactions are completed within allowable time frames, ...
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