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By Colin J. Theaker

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Consider a situation where a user Is performing. say. an edit command that requires C units of processor time. The user types a command every T seconds and then has to walt a time R before he receives a response back at the terminal. The user therefore requires C units of time every T + R Scheduling - Principles seconds. If there are N machine. they will each seconds. and so 49 users performing similar operations on the be performing a command every T + R N * C .. T + R Thus. as would be expected.

1) Real time systems The main use of real time systems Is to support some type of process-control application. The Important characteristic of real-time systems Is that any Interaction with the computer must receive a response within a predefined time period. It Is essential that this response time can be guaranteed. ) This requirement usually means that the software Is special purpose and dedicated to one particular application. The peripherals on such a system are also likely to be special.

3) Characters are removed by the user process at USERPTR. (4) The user process Is wakened whenever a newline Is placed In the buffer. (5) BUFLIN records the last newline character placed In the buffer. This fulfils two functions: (a) The user process Is halted as soon as USERPTR reaches BUFLIN. In addition. a prompt will be output If the user has not typed any more Input. that Is when BUFPTR BUFLIN. = (b) The logical backspace facility operates only as far back as BUFLIN. This prevents the user from deleting characters that have already been read by his process.

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