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Q. Several CPUs provide for more than two modes of operation. What are two probable uses of these multiple modes?
Answer: Although most systems merely distinguish between user and kernel modes some CPUs have supported multiple modes. Multiple modes could be utilized to provide a finer-grained security policy. For instance rather than distinguishing between just user and kernel mode you could distinguish among different types of user mode. Possibly users belonging to the same group could execute each other's code. The machine would depart into a specified mode when one of these users was running code. While the machine was in this mode a member of the group could run code belonging to anyone else in the group.
An additional possibility would be to provide different distinctions within kernel code. For instance a specific mode could allow USB device drivers to run. This would signify that USB devices could be serviced without having to switch to kernel mode thereby essentially allowing USB device drivers to run in a quasi-user/kernel mode.
with the aid of diagrams describe the following OS structure monolithic,layered and client server.
Q. How does the distinction among kernel mode and user mode function as a rudimentary form of protection (security) system? Answer: The distinction among kernel mode and user m
Elimination of common sub expression during code optimization An optimizing transformation is a rule for rewriting a section of a program to enhance its execution efficiency wi
Q. If each the access rights to an object are deleted the object can no longer be accessed. At this stage the object should also be deleted and the space it occupies should be ret
Developing Code with Threads Writing code to support a thread-based implementation is very straightforward. Simple APIs are presented to the developer for each threads package.
What lead to the concept of paging? The main memory is separated into two parts that are one for the resident operating system, and one for the user processes. We may perhaps p
Load Sharing : Processes are not given to a particular processor. A global queue of threads is used to maintain. Each processor, when idle, picks a thread from this queue. Note th
Construct a process tree similar to Figure 1. Look up the Linux command pstree -p and describe what it does. Then type in the command the capture the output.
What is spooling? Spooling overlaps the I/O of single job with the computation of other jobs.
What is a Dispatcher? The dispatcher is the module that gives control of the CPU to the process selected by the short- term scheduler. This function includes: Switching
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