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Q. Why is it complicated to protect a system in which users are allowed to do their own I/O?
Answer: In earlier chapters we identified a distinction among kernel and user mode where kernel mode is utilized for carrying out privileged operations such as I/O. One reason why I/O should be performed in kernel mode is that I/O requires accessing the hardware as well as proper access to the hardware is necessary for system integrity. If we permit users to perform their own I/O we can't guarantee system integrity.
with aid of diagram describe 2 types of fixed partition allocation used in operating system
Which are the different states of a process? Different status of a process is: New: When the process is created. Running: When instructions are executed. Wait
a program that can do cpu scheduling algorithm priority using javascript or php to display gaant chart and calculate waiting and average waiting time
Define Virtual memory Virtual memory is employed in all major commercial operating systems
explain how response time are reduced by allowing time sharing on top of multiprogramming
what is file?explain the file access methods?
Explain the OS/2 Operating System Like NetWare, OS/2 manage resources at three levels, as shown in Figure 4.5 Resources may be maintained at the session, process, and thread le
FCFS (First Come, First Served) Perform operations in order requested No reordering of work queue No starvation every demand is serviced Poor performance
bootstrap
what is cpu
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