| OCR Text |
Show ...__ ~-__™™___„ u 74 ^^gg£„..P4.iS£A.gligi}_wxth Two Seta of Bata One way this has b«en done in conventional B«-chi«*s.i« to create a separate data area for each process and to force the process description to access all its. data through a base register which contain the low order-address of the öösired data« Now the process description «lay be switched from one process (the handling of data A)- to another (the handling of data B) with ease provided, the reentry point of each process is retained while the other is being ©Keouted, To effectively run the two processes in parallel, a fixed time of execution may be assigned to one process before the other one must be started up. This is the H££ quantum and typically is about 10 me. It is not difficult to generalize this idea to the FLEX environment and the segment system. 2kl^E£0££s^escri£tion is a segment. Each data are* becomega segment and the base registar refers to the data segment name. The reentry points may becott* p&rt of their associated data. All that remains is to formulate a scheme for scheduling the execution of each process. A Bimple list containing the process names which is visited "round-robin" fashion every 16 ms will do. |
