Operating System (OS)
Semaphores

synchronize critical resources to prevent deadlock
synchronize critical resources to prevent contention
are used for memory management
None of these
are used to do I/O

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Operating System (OS)
What is the meaning of "Hibernate" in Windows XP/Windows 7?

Shutdown the Computer without closing the running applications
Restart the Computer in hibernate mode
Shutdown the Computer terminating all the running applications
Restart the Computer in safe mode

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