Operating System Features
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Complicated by
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shared
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virtual
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asynchronous
Concurrent (Concurrence)
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Concurrency : two or more events in the same time interval occurs
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Parallel : two or more events at the same time take place
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The purpose of introducing the process: the program can execute concurrently
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Microscopic These programs or time-divisionally alternately performed
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The operating system concurrency , by time-sharing achieved
Sharing (Sharing)
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Resource sharing, refers to the system memory available to process multiple concurrent execution of common use
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Share the mutex
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Simultaneous access
Virtual (Virtual)
- To a physical entity becomes a plurality of logical counterparts
Asynchronous (Asynchronism)
- Multi-channel programming environment that allows concurrent execution of multiple programs, due to limited resources, the implementation process is not consistent in the end, the stop and go, unpredictable speed forward