Threads Single process, single thread DOS Multiple processes, single thread per process UNIX One process, multiple threads Java run-time(actually not an Os) Multiple processes multiple threads per process Solaris. Windows 2000/XP Windows XP. mach. oS/2. Linux Multithreading a process unit of protection and unit of resource allocation )virtual address space, process image >)protected access to processors, interprocess communication (IPC), files. lo resources 22 Threads – Single process, single thread • DOS – Multiple processes, single thread per process • UNIX – One process, multiple threads • Java run-time (actually not an OS) – Multiple processes, multiple threads per process • Solaris, Windows 2000/XP, Windows XP, Mach, OS/2, Linux – Multithreading • a process – unit of protection and unit of resource allocation » virtual address space, process image » protected access to processors, interprocess communication (IPC), files, I/O resources