Operating Systems: Concepts, Policies, and MechanismsPrentice Hall, 1989 - 356 Seiten Software -- Operating Systems. |
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Seite 188
... status of the chip to see whether data has been received . ; It remains in a loop testing bit 1 of the status word ; until the bit is set . When the bit is set , the data is ; read into the CPU and stored in the AL register . ; Control ...
... status of the chip to see whether data has been received . ; It remains in a loop testing bit 1 of the status word ; until the bit is set . When the bit is set , the data is ; read into the CPU and stored in the AL register . ; Control ...
Seite 191
... status ) ; { This device driver controls the operation of a simple terminal capable of displaying characters on the screen and receiving characters from the keyboard . The driver has two main sections : initiator and continuator . The ...
... status ) ; { This device driver controls the operation of a simple terminal capable of displaying characters on the screen and receiving characters from the keyboard . The driver has two main sections : initiator and continuator . The ...
Seite 192
... status , buffer Entry conditions Exit conditions begin : interrupts disabled , cpu registers saved : write data , if any , in buffer : device status in status , read data in buffer { Get status and check to see if the device has an ...
... status , buffer Entry conditions Exit conditions begin : interrupts disabled , cpu registers saved : write data , if any , in buffer : device status in status , read data in buffer { Get status and check to see if the device has an ...
Inhalt
STRUCTURE AND FLOW IN A LAYERED OPERATING | 13 |
Concurrency | 15 |
CONCURRENCY IN PROGRAMS | 34 |
Urheberrecht | |
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access_queue active queue algorithm allocation banker's algorithm batch begin blocked queue buffer bytes cess chapter circular wait command interpreter concurrency create data element deadlock delete described device driver discussed disk error example executing process exit FCFS File control block file manager file name flag hardware I/O operation I/O request implementation index blocks initiator input spool interrupt IOCS Larry logical unit long-term scheduler main memory mapping memory management module monitor move operating systems output spool performance pointer priority problem procedure process control block pseudocode reference routine segment semaphore sequential shared short-term scheduler shown in Figure signal SNAIL diagram specified spool file spooler SSTF status stored structure suspend queue tape drive techniques TERM SCHEDULER termination test-and-set tion transfer user process variable wait