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How can a user program disturb the normal operation of the system?
a) Issuing illegal I/O operation.
b) By accessing memory locations within the OS itself.
c) Refusing to relinquish the CPU.
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We have talked about blocking locks, which voluntarily yield, and spinlocks, which just spin until they acquire the lock. At ?rst, it seems like spinlocks are verywasteful, and tha
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