Question

Most operating systems today are use a scheme that supports multiple address spaces, each with multiple threads of control. assume you are giving two operating systems: OS-A which supports multiple addresses spaces each with one thread of control and OS-B which is single address space OS with multiple threads of control. Which OS (OS-A or OS-B) would it be easier to modify to support multiple address spaces each with multiple threads of control? Explain

Answer 1

Answer:-

OS-B

Explanation:-

Presents a paradigm that combines the speed of single address spaces with the traditional protection mechanisms found in multiple address space systems such as UNIX. Multiple address spaces are common today for providing safety and security in operating systems. A process in one address space cannot corrupt or compromise memory locations an another process's address space. However, inter-process communication is slow because it is expensive to context switch between address spaces. Single address space systems provide a solution to the problem of slow context switches. In a single address space system, which is typically implemented in a 64-bit address space, all processes shape a common address space. Hence, the need to move between address spaces during inter-process communication is avoided. It is our position that it is not strictly necessary to use a single address space in order to achieve fast inter-process communication