A priority strategy on RISC for real-time multitasking software applications

In t h e p re sen t CISC the processor needs to s to re t h e t a s k s t a t e i n f o r m a t i o n , k n o w n as T a s k S t a t e S e g m e n t (TSS), or P rocess C o n t r o l B lock ( P C B ) of the p r e sen t r u n n i n g t a s k in to t h e m a i n m e m o r y a t each t i m e the t a s k swi t ch ing occur . T h e TSS of the new t a s k shou ld be l oaded to t h e TSS reg is te r of t he processor. Th i s t r a n s f e r of TSS t o / f r o m m a l n m e m o r y for each t a s k sw l t ch lng ls t i m e c o n s u m i n g , especia l ly w h e n the TSS size is large a n d t h e t a s k sw l t ch lng Is more f r equen t .