| 摘要 |
Services for a personal electronic device are provided through which a form of background processing or multitasking is supported. The disclosed services permit user applications to take advantage of background processing without significant negative consequences to a user's experience of the foreground process or the personal electronic device's power resources. To effect the disclosed multitasking, one or more operational restrictions may be enforced. A consequence of such restrictions, a process may not be able to do in the background state, what it may be able to do if it were in the foreground state. In one embodiment, while a background task may be permitted to complete a first task, it may not be permitted start a new task—being suspended after completion of the first task. Implementation of the disclosed services may be substantially transparent to the executing user applications.
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