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List and briefly define two approaches of dealing with multiple interrupts?
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List and briefly define two approaches to dealing with multiple interrupts?
The discussion so far has only covered the occurrence of a single interrupt. Suppose, however, that multiple interrupts can occur. For e.g. a program may be receiving data from a communication line and printing results. The printer will generate an interrupt every time that it completes a print operation. The communication line controller will generate an interrupt every time a unit of data arrives. The unit could either be a single character or a block, depending on the nature of the communications discipline. In any case, it is possible for a communications interrupt to occur while a printer interrupt is being processed. Two approaches can be taken to deal with multiple interrupts. The first is to disable interrupts while an interrupt is being processed. A disabled interrupt simply means that the processor can and will ignore that interrupt request signal. If an interrupt occurs during this time, it generally remains pending and will be checked by the processor after the processor has enabled interrupts. Thus, when a user program is executing and an interrupt occurs, interrupts are disabled immediately. After the interrupt handler routine is completed, interrupts are enabled before resuming the user program and the processor checks to see if additional interrupts have occurred. This approach is nice and simple, as interrupts are handled in strict sequential order (Figure3.10 (a)). The drawback to the preceding approach is that it does not take into account relative priority or time-critical needs. For e.g. when input arrives from the communications line, it may need to be absorbed rapidly to make room for more input, If the first batch of input has not been processed before the second batch arrives, data may be lost. A second approach is to define priorities for interrupts and to allow an interrupt of higher priority to cause a lower-priority interrupt handler to be itself, interrupted. As an example of this second approach, consider a system with three I/O devices: a printer, a disk, and a communications line, with increasing priorities of 2, 4, and 5, respectively. A user program begins at t=0. At t=10, a printer interrupt occurs; user information is placed on the system stack and execution continues at the printer interrupt service routine (ISR). While this routine is still executing, at t=15, a communications interrupt occurs. Because the communications line has higher priority than the printer, the interrupt is honored. The printer ISR is interrupted, its state is pushed onto the stack, and execution continues at the communications ISR. While this routine is executing, a disk interrupt occurs (t=20). Because this interrupt is of lower priority, it is simply held and the communications ISR runs to completion. When the communications ISR is complete (t=25), the previous processor state is restored, which is the execution of the printer ISR. However, before even a single instruction in that routine can be executed, the processor honors the higher priority disk interrupt and control transfers to the disk ISR. Only when that routine is complete (t=35) is the printer ISR resumed. When that routine completes (t=40), control finally returns to the user program.
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