New PDF release: Concepts of Operating Systems

By Colin J. Theaker

ISBN-10: 0333523660

ISBN-13: 9780333523667

ISBN-10: 1349115118

ISBN-13: 9781349115112

Rev. and accelerated ed. of: a realistic direction on working platforms. 1983.

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6 Design of a simple spooling system 3 Output System This process drives the printer through an interrupt procedure. It is responsible for retrieving blocks of a document from the disk, via the Disk Manager, and for transferring the individual characters to the printer. It interfaces with the Output Scheduler whenever a new document is required to be printed. 4 Job Processor This is the process in which the user program executes. It may be pre-loaded with a range of system utilities to support the user, for example compilers.

It interfaces with the Output Scheduler whenever a new document is required to be printed. 4 Job Processor This is the process in which the user program executes. It may be pre-loaded with a range of system utilities to support the user, for example compilers. It will also have procedures which allow the user program to interface with the operating system. For example, read_character and princcharacter procedures will operate on blocks of input/output documents, brought into buffers in memory by the Disk Manager, and a stop procedure may be called to terminate a program and allow the operating system to run the next user job.

It may be pre-loaded with a range of system utilities to support the user, for example compilers. It will also have procedures which allow the user program to interface with the operating system. For example, read_character and princcharacter procedures will operate on blocks of input/output documents, brought into buffers in memory by the Disk Manager, and a stop procedure may be called to terminate a program and allow the operating system to run the next user job. 5 Job Scheduler The Job Scheduler maintains information about all the jobs in the machine waiting to be run, and about the input documents required by the jobs.

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Concepts of Operating Systems by Colin J. Theaker


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