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fault tolerancemachine failures communication faults storage device crashes and decays of storage media should be tolerated by the system to some
transparencyusers must be able to access remote resources as though these resources were local transparency should as well promote user mobility
what is an io subsystemthe control of devices connected to the computer is a main issue while designing operating systems since io devices differ
what are the different file operationscreate - space for the file in the file system update directory tablewrite - file name and data to be
file organization sequential direct indexeda file still if it is stored on a magnetic disk or cd-rom disk may
write a short note on file organization and accessthere are three methods to access files1record access2sequential access3random accessthe record
what is meant by file management systemsfile management systems are as well referred to as simply a file system file system is the system that an os
what are the different files attributesfile name-its the name of the file its the name with which the user identifiesidentifiers-its created when a
what is file allocation the structure that offers the fat file system its name is the file allocation table in order to know what this important
how are file sharing and protection implementedto implement file protection and sharing the system ought to maintain more file and directory
what is co-operating schedulingcpu scheduling decisions may possibly place under the following four circumstances1 when process
what are scheduling queuessince the processes enter the system they are put into job queue this queue contains all processes in the system the
what is long-term medium-term short-termin a batch system many processes are submitted than are able to be executed immediately these processes are
what is a two state process model at any time a process is being implementing by a processor or not therefore a process may be in running or not
what is a process control blockevery process in the operating system is represented by a process control block as well called a task control block it
which are the different states of a process different status of a process is new when the process is created running when instructions are
define process what is meant by state of a processprocess is a program in implementation a process in general includes the process stack which
explain with an example the need of shift alteration in critical section problemconsider processes pi and pj and consider the algorithm for pi and
what is busy waitingwhen strict alteration is done there may take place situation like two processes setting their flag as true therefore both of the
explain the petersons solution for the critical section problemin petersons solution two variables a flag and b turn are used as shared variables if
what are three conditions that a solution for the critical section problem must satisfythe three conditions are as following-a
write a short note on pcbevery process is represented in the operating system by a process control block also called a task control block it contains
write note on process process statea process is in excess of the program code which is sometimes known as text section it as well includes the
what are the requirements for solution of critical section problemsmutual exclusion if process p is implementing in its critical section then no
what is critical sectionevery process has a segment code called the critical section in which the process may be updating tables changing variables