Operating Systems Questions

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

If a process in a monitor signal and no task is waiting on the condition variable, the signal is lost. So this allows easier program design. Whereas in semaphores, every operation affects the value of the semaphore, so the wait and signal operations should be perfectly balanced in the program.

The process states of unix are running,Zombie,stopped,Waiting.

All the above listed are the System calls for process management

Paging is a memory management technique in which process address space is broken into blocks of the same size called pages.

It is used to get parent process identifier

1) ability to support multiple processors
2) virtual storage
3) source level debugging

Process Dispatcher,Vhand,Dbflush are the children of Scheduler