Operating system is a system software that is manages a computer hardware and a computer software provides resources and a common service of computer programs.
Operating system provides all computer program and other devise including firmware to perform any function. Time sharing is an operating system that perform schedule task for used the system this may include various types of software such as accounting software that is used for the cost allocation time of processor mass storage printing and other resources.
Computer Hardware function inputs and outputs and memory allocations operating system acts between computer program and computer hardware these applications code usually executed directly the computer hardware and frequently makes a systems call to operating system functions or interrupted it.
Operating system are used on many
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In system call computer programming interface servive providers the operating system they can written the high level language such as c and c++Many systems now include both CLI and GUI interfaces System calls can differ from platform to platform
The operating system can provides new versions of a system call with the enhanced features there are differents types of system call
Process control File management Device management Information maintenance Communications Protection
In operating system a process with two or more threads threads of execution, running on one processor.they can be the tw types of threads one of the user side threads and other of the kernel side threads
User side threads management done by userlevel threads library and the kernel sides threads supports only kernel side Solaris Lightweight processes is an example of kernal threads its consist three threads models these model are one to many model one to one and many to many model these model very useful to