In a multiprocessor system there exist several caches each may containing a copy of same variable A.
Many of the ideas used in MULTICS were subsequently used in UNIX. MULTICS (Multiplexed information and computing services) operating system was developed from 1965-1970 at Massachusetts institute of technology as a computing utility. But soft real time operating systems have less stringent timing constraints. Hard-real-time OS has well-defined fixed time constraints. The computer must analyze the data and possibly adjust controls to Here the sensors bring data to the computer. They can share the network resources,communicate with each otherġ3.Explain the concept of Real-time operating systems?Ī real time operating system is used when rigid time requirement have been placed on the operation of a processor or the flow of the data thus, it is often used as a control device in a dedicated application. In Symmetric multi processing each processor run an identical copy of the OS, and these copies communicate with each other as and when needed.But in Asymmetric multiprocessing each processor is assigned a specific task.ġ2.Explain the concept of the Distributed systems?ĭistributed systems work in a network. of processors to increase the speed of execution, and reliability, and economy. The CPU executes multiple jobs by switching among them, but the switches occur so frequently that the user feels as if the operating system is running only his program.ġ1.Explain the concept of the multi-processor systems or parallel systems? It is a logical extension of the multi-programmed OS where user can interact with the program.
When a executing program needs some I/O operation then the operating system fetches another program and hands it to the CPU for execution, thus keeping the CPU busy all the time.ġ0.Explain the concept of the time sharing operating systems? Then it chooses a program from the ready queue and gives them to CPU to execute. The operating system fetches a group of programs from the job-pool in the secondary storage which contains all the programs to be executed, and places them in the main memory. This is time consuming but makes the CPU busy all the time.ĩ.Explain the concept of the multi-programmed operating systems?Ī multi-programmed operating systems can execute a number of programs concurrently. In batched operating system the users gives their jobs to the operator who sorts the programs according to their requirements and executes them. A BIOS is also known as firmware.Ĩ.Explain the concept of the batched operating systems? This allows the user to configure the input and output of a computer.
DEADLOCK DEFINITION IN OPERATING SYSTEM SOFTWARE
It comes from an old expression “to pull oneself up by one’s bootstraps.”Ī BIOS is software that is put on computers. power consumptionĤ.What are the different operating systems?īootstrapping is a technique by which a simple computer program activates a more complicated system of programs.
DEADLOCK DEFINITION IN OPERATING SYSTEM PC
The machine Purpose Workstation individual usability &Resources utilization Mainframe Optimize utilization of hardware PC Support complex games, business application Hand held PCs Easy interface & min. The purpose of an OS is to provide a convenient environment in which user can execute programs in a convenient and efficient manner.It is a resource allocator responsible for allocating system resources and a control program which controls the operation of the computer h/w.Ģ.What are the various components of a computer system?ģ.What is purpose of different operating systems? An operating system is a program that acts as an intermediary between the user and the computer hardware.
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