Answer the following statements true (T) or false (F)
1. On a traditional IBM mainframe, interrupts are implemented by switching program status
words, so the old PSW field provides a link back to the task that was executing at the
time the interrupt occurred.
2. On a traditional IBM mainframe running under MVS, job management, task
management, and application program routines are linked through a series of control
blocks that hold key control information in memory.
3. On a traditional IBM mainframe, the old PSW holds system constants and pointers.
4. On a traditional IBM mainframe running under MVS, each partition has its own PSW.
1. T
2. T
3. F
4. F
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Indicate whether the statement is true or false
The wait-die concurrency control is another control that combines the concepts of the immediate-update concurrency control and the timestamp-ordered control.
If transaction T1 makes a request that conflicts with an operation of active transaction T2 if TS(T1) < TS(T2), then make T1 wait until T2 terminates, else abort T1. where abort T1 is referred to as a die because T1 kills itself. a. Showthat the wait-die control serializes in commit order and prevents deadlocks. b. Compare the fairness of the execution of the kill-wait and wait-die controls.