When one thread alters a code segment memory item, all other threads see that. Threads provide a way to improve application performance through parallelism.
Threads represent a software approach to improving performance of operating system by reducing the overhead thread is equivalent to a classical process.
Most importantly, it directly has privilege access to the underlying hardware.
Major components of an OS are file system, scheduler, and device driver.
What will the user want to execute on that machine? The 3 types of Operating Systems commonly used nowadays are: (1) Monolithic OS, where the entire OS is working in kernel space and is alone in supervisor mode; (2) Modular OS, in which some part of the system core will be located in independent files called modules that can be added to the system at run time; and (3) Micro OS, where the kernel is broken down into separate processes, known as servers.
Some of the servers run in kernel space and some run in user-space. The execution of a process must progress in a sequential fashion.
Each thread belongs to exactly one process and no thread can exist outside a process. Threads have been successfully used in implementing network servers and web server.
They also provide a suitable foundation for parallel execution of applications on shared memory multiprocessors.
We are motivated by two closely related trends in hardware design: first, the rapidly growing number of cores, which leads to a scalability challenge, and second, the increasing diversity in computer hardware, requiring the OS to manage and exploit heterogeneous hardware resources.
For more information, please read our documentation. See Section Download for information on how to obtain the code. We have posted a detailed list of changes on our mailing list.