Dual level scheduling of processes to multiple parallel regions of a multi-threaded program on a tightly coupled multiprocessor computer system

On a tightly coupled multiprocessor computer system, the multiple parallel regions of a multithreaded applications program can execute simultaneously as multiple threads on a plurality of processors. Furthermore, a plurality of multithreaded programs may run simultaneously. The current invention uses an efficient system to schedule and reschedule processors to run these multiple threads. Scheduling is integrated at two levels: at the first level, processors are assigned processes. At the next level, processes are assigned threads. Increased efficiency is achieved by this integration and also by the formation of processes with destructible context. It makes use of shared storage to indicate the process request level and the control state for each parallel region.