CSCE 3612 ch6-4 - Processes and operating systems...

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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Processes and operating systems Interprocess communication. Operating system performance. Power management.
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Interprocess communication OS provides interprocess communication  mechanisms: various efficiencies; communication power.
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Interprocess communication Interprocess communication  ( IPC ): OS  provides mechanisms so that processes  can pass data. Two types of semantics: blocking : sending process waits for response; non-blocking : sending process continues.
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. IPC styles Shared memory: processes have some memory in common; must cooperate to avoid destroying/missing  messages. Message passing: processes send messages along a  communication channel---no common  address space.
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Shared memory Shared memory on a bus: CPU 1 CPU 2 memory
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed. Race condition in shared memory Problem when two CPUs try to write the  same location: CPU 1 reads flag and sees 0. CPU 2 reads flag and sees 0. CPU 1 sets flag to one and writes location. CPU 2 sets flag to one and overwrites  location.
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© 2008 Wayne Wolf Overheads for Computers as Components 2 nd ed.
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