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Any attempt by the user program to execute a privileged instruction is trapped by the hardware as an error, and causes a special interrupt to occur. When any interrupt occurs, the OS regains control and the mode switches back to privileged mode. In the case of the errant user program, the OS issues an error message, terminates the faulting program, and resumes computing with another process. Timesharing (1970s and 1980s) When computers were so extremely expensive, a vision of the future for many was that a central expensive computer would provide services to many users via remote terminals. Timesharing was developed as an extension of multiprogramming where the job commands came to the central computer via the terminal communication lines. Timesharing required an important advance in program scheduling called the timeslice. In round-robin fashion, each user program in turn received a small unit of time on the CPU. Since the central computer was so fast, each user had the illusion that they had the computer to themselves. With timeslicing, the system clock became a source of important interrupts. At programmed intervals, the clock interrupts; the interrupt invokes the OS in privileged mode; the OS decides if the currently executing process should continue, or if its timeslice is up; then the OS either resumes the currently executing process or schedules another, as appropriate. SINGLE-USER OS NETWORK OS With the advent of inexpensive personal computers, the vision of the future migrated from terminals connected to a powerful central host to small inexpensive computers distributed widely, and loosely connected by network services. Operating systems for such machines now incorporate all the features of large computer operating systems of the past. In fact, operating systems such as UNIX, originally developed to support terminals connected to a central computer, have been moved to personal computer platforms. Microsoft s operating systems, on the other hand, have grown from single-user-only environments to fully featured operating systems that even include multiuser and multiprocessor support. When computers on the network provide resources to other computers, such as a web server does, the computers are called servers. Networked computers that access the services and data of other machines on the network are called clients. Often a single computer may act as both client and server at different times. MULTIPROCESSOR OPERATING SYSTEMS Computers with multiple processors offer the potential of greater computational speed. With this potential comes complexity, however. The complexity surrounds the shared resources that must be managed properly in a multiprocessor environment. For instance, there will be a Ready queue of processes to be run. Should there be a Ready queue of programs to run for each CPU Should instead each CPU inspect the same Ready queue that all share Should one CPU handle the scheduling for all the other CPUs Or, should each CPU make its own scheduling decisions What about shared I/O devices and device tables What about shared memory and the allocation of processes to memory The simpler approach to a multiprocessor OS is to have one CPU be the master and have it make decisions on behalf of the other slave CPUs. This approach is called asymmetric multiprocessing. For a small number of processors (say, 10 or fewer), asymmetric multiprocessing can work well. As the number of processors increases, however, the master becomes a bottleneck, for it must be consulted for all important resource allocation decisions. A more sophisticated approach to multiprocessor support is called symmetric multiprocessing (SMP). With SMP there is only one copy of the OS code in the shared memory, and all processors execute it. There is only one set of system tables, which all processors share. SMP dynamically provides load balancing, but the trick to making SMP work is in synchronizing access among the processors to the shared resources.
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