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Lecture-3 - Principles of Concurrency and Parallelism...

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CS390C: Principles of Concurrency and Parallelism Principles of Concurrency and Parallelism Lecture 3: Threads and Events 1/17/12 1 Tuesday, January 17, 12
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CS390C: Principles of Concurrency and Parallelism Threads and Processes A process is a representation of a computation managed by an operating system Virtual address space process control block A thread is a representation of a computation managed by an application thread control block Process and thread control blocks contain all the information necessary to execute the computation (e.g., stacks, register contents, program memory, etc.) Main difference: all threads within a computation execute within the same address space 2 Tuesday, January 17, 12
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CS390C: Principles of Concurrency and Parallelism Processes 3 Process P1 Process P2 Data D1 Data D2 Address space Address space Tuesday, January 17, 12
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CS390C: Principles of Concurrency and Parallelism Threads 4 Thread T1 Thread T2 Data D1 Data D2 Address space Process Tuesday, January 17, 12
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CS390C: Principles of Concurrency and Parallelism Threads and Processes Critical distinction: References (i.e., locations) have meaning between threads They are interpreted independently between processes Sharing state among processes requires special care memory-mapped regions, devices, etc.
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