In polling ____________

• A. Busy €? wait cycles wait for i/o from device
• B. Interrupt handler receives interrupts
• C. Interrupt-request line is triggered by i/o device
• D. All of the mentioned

A non blocking system call _________________

• A. Halts the execution of the application for an extended time
• B. Does not halt the execution of the application
• C. Does not block the interrupts
• D. None of the mentioned

An asynchronous call ____________

• A. Returns immediately, without waiting for the i/o to complete
• B. Does not return immediately and waits for the i/o to complete
• C. Consumes a lot of time
• D. Is too slow

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

Caching is ________ spooling.

• A. Same as
• B. Not the same as
• C. All of the mentioned
• D. None of the mentioned

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

Spooling ____________

• 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

The ________ keeps state information about the use of I/O components.

• A. Cpu
• B. Os
• C. Kernel
• D. Shell

The kernel data structures include ____________

• A. Process table
• B. Open file table
• C. Close file table
• D. All of the mentioned

Windows NT uses a __________ implementation for I/O.

• A. Message €? passing
• B. Draft €? passing
• C. Secondary memory
• D. Cache