Pthreads is the POSIX standard (IEEE 1003.1c) defines an API for thread creation and synchronization. It is only a specification, not implementation which a programmer can do any way they wish. Some examples of systems using are Solaris, Linux, Mac OS X, and True64 UNIX. Here is an example of Pthread API for constructing a … Read more
A thread is a basic unit of CPU utilization; it has a thread id, a program counter, a register set, and a stack. It shares code, data and other os resources such as open files and signals with other threads in the process. Multi-threaded Processes The traditional single-threaded program can do only one task, the … Read more
OS provides the computing environment. They are organized in many ways in different systems, but a few things are common for all OS. In a single user system, the CPU sits idle when I/O is working or vice-versa. The CPU utilization increase with multi programming systems. A subset of jobs from a pool of jobs … Read more
The computer system structure consists of interrupt mechanism for I/O devices, memory unit to run programs, memory protection, and disk storage to save program and data files. Computer-system operations A modern general purpose computer has CPU and device controllers for devices such as disk, audio devices, and video display devices connected to a common system … Read more
A system call is an interface between the user program and the operating system. The program asks for different services and in response the OS invoke a set of system calls to fulfill the request. What is a system call? A system call is written in either assembly language or a high level such as … Read more
A process is program in execution in a modern time-sharing computer. A process needs resources such as CPU, memory, and input-output devices. OS is responsible for creating, deleting, and maintaining process information. Understanding Processes Therefore, we can safely say the following things about the process: A process is an instance of a program in execution … Read more
An operating system is system software that ensures the smooth functioning of a computer system. In earlier days of computing, the only job of a computer was to compile source code into a program. There were programs to do other tasks such as printing, loading source code, etc. These programs are called system programs because … Read more
In this article you will learn about storage structure and disk scheduling algorithms. You analyses the advantages and disadvantages of different disk scheduling algorithms. Learn to measure the performance of disk such as seek time. A problem is given for each algorithm, you can also try to solve them if you are already familiar with … Read more
In this article, you will learn about deadlock prevention method – Banker’s algorithm and Resource allocation graph. You will also learn about 4 conditions for deadlock. Let’s start with the resource allocation graph. Resource Allocation Graph Resource Allocation graph describes the deadlock more precisely. It has a set of vertices V and set of edges … Read more
OS is a layer between user and the computer hardware that manages resources like disk, memory, etc.
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