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such an application will almost always limit the number of elements in the list so that a flood of requests will not simply swamp the computer and leave no time or memory for processing requests. So the server thread will also include a check to see if the number of pending requests is already at its maximum value; if so, the server thread will wait until the worker thread can complete at least one of the tasks. On the other side, imagine the worker thread taking tasks off the list. Again, removing a task from the list will require multiple machine instructions. The worker thread will also be checking to see if the list is empty, for there may be no work to do. In that case, the worker thread will wait until some task is added to the list by the server thread. Since an interrupt can occur between any two machine instructions, and since the operating system may choose to execute any ready thread at any moment, it is possible that the server thread will be interrupted as it adds a task to the list, and that the worker thread will be scheduled to execute next. Without some control to insure that items are added to and removed from the list at appropriate times and as whole items, it s possible that the coordination will fail. For instance, suppose the server thread finds the address of the last element of the list and then is interrupted. After the OS services the interrupt, the OS schedules the worker thread, which removes a task from the list and completes processing. In fact, the worker may continue to execute and remove several tasks from the list before the OS intervenes to schedule another thread. When the server thread eventually regains the CPU, it will continue from the point it was interrupted, and store a reference to a new task in the location it previously computed. Now, however, the address is incorrect. Depending on the situation, one of several possible errors will occur, but the application will surely fail, and it will fail in a way that cannot be reliably reproduced. Such errors can be devilish to debug. The section of code that must be executed in isolation in order to avoid corruption is called the critical section. Guaranteeing correct execution of the critical sections requires that mutual exclusion be enforced when the critical sections are executing. The code of a cooperating thread that is not in the critical section (and often most of the code is not in the critical section) is called the remainder section. Since operating systems themselves are often also implemented as multiple threads, coordination between executing threads or processes is important both to people writing operating systems ( systems programmers ) and applications programmers. This synchronization problem occupied a great deal of computer science research during the 1960s, 1970s, and 1980s. Several solutions have been developed. Dekker offered the first software solution to the problem in 1965, and a simplification by Peterson was published in 1981. These solutions involved shared variables and employed busy waiting (i.e., the waiting process or thread had to wait continually check to see if the condition had changed). While these papers were groundbreaking, one would not use this approach today. For one thing, these approaches are limited to situations where only two processes are cooperating, and for another, the busy wait is wasteful of CPU time. A hardware approach to synchronization is relatively simple, but does have the limitation that it, too, requires a busy wait. All that is necessary is a single machine instruction that tests some condition and also sets the condition in the same instruction execution cycle. Since it can t be interrupted, such a test-and-set instruction can be used for coordination. In pseudocode, here is what a test-and-set instruction does: boolean testAndSet( boolean lock ) { if( !lock ) { lock = true; return true; } else return false; } This code says: The routine name is testAndSet, and it will return either true or false (a boolean value). testAndSet operates on a variable we will call lock , and lock can have the value true or false (it s a boolean variable).
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