Operating System (OS)
A page fault occurs when

the page is not found in the memory
the page is found in the memory
the Segmentation starts
the Deadlock happens

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Operating System (OS)
A critical region is

a program segment that often causes unexpected system crashes
none is the above
one which is enclosed by a pair of P and V operations on semaphores
a program segment where shared resources are accessed
a program segment that has not been proved bug-free

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Operating System (OS)
The Storage-to-Storage instructions

All of these
have both their operands in the main store.
which perform indicated operations on two fast registers of the machine and have the result in one of the registers
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, expect in the case of store operation when it is also
None of these

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