Operating Systems Questions

The repeated execution of a loop of code while waiting for an event to occur is called busy-waiting. The CPU is not engaged in any real productive activity during this period, and the process does not progress toward completion.

The PS command prints the process status for some or all of the running processes

Windows operating system uses the NTFS file system.

Default permissions given to a file are:

Owner - read write and execute - 6

group - write - 4

others - write - 4

Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel. By default, a Linux user falls under same as userid (UPG) group.

A hard real-time system guarantees that critical tasks complete on time. This goal requires that all delays in the system be bounded from the retrieval of the stored data to the time that it takes the operating system to finish any request made of it. A soft real time system where a critical real-time task gets priority over other tasks and retains that priority until it completes. As in hard real time systems kernel delays need to be bounded

In order to protect the operating systems and the system programs from the malfunctioning programs the two mode operations were evolved

System mode

User mode