OS I/O Systems
A non blocking system call _________________
halts the execution of the application for an extended time
does not halt the execution of the application
does not block the interrupts
none of the mentioned
does not halt the execution of the application
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Caching ____________A. holds a copy of the data
B. is fast memory
C. holds the only copy of the data
D. holds output for a device
A ________ is a full duplex connection between a device driver and a user level process.
A. Bus
B. I/O operation
C. Stream
D. Flow
The _________ are reserved for events such as unrecoverable memory errors.
A. non maskable interrupts
B. blocked interrupts
C. maskable interrupts
D. none of the mentioned
Caching is ________ spooling.
A. same as
B. not the same as
C. all of the mentioned
D. none of the mentioned
Buffering is done to ____________
A. cope with device speed mismatch
B. cope with device transfer size mismatch
C. maintain copy semantics
D. all of the mentioned
The ______ register is written by the host to send output.
A. status
B. control
C. data in
D. data out
If one or more devices use a common set of wires to communicate with the computer system, the connection is called ______
A. CPU
B. Monitor
C. Wirefull
D. Bus
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