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ST20-C1 Datasheet(PDF) 154 Page - STMicroelectronics |
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ST20-C1 Datasheet(HTML) 154 Page - STMicroelectronics |
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154 / 205 page  154/205 ® Iptr ′← word [frontptr @ pw.Iptr] if (frontptr = backptr) --one process on queue, so make it empty word ′[SchedulerQptr @ q.FPtrLoc] ← NotProcess else --many processes, so remove first word ′[SchedulerQptr @ q.FPtrLoc] ← word[frontptr @ pw.Link] } Areg ′← undefined Breg ′← undefined Creg ′← undefined } where frontptr = word[SchedulerQptr @ q.FPtrLoc] backptr = word[SchedulerQptr @ q.BPtrLoc] Status Register: Global interrupt enable and timeslice enable are preserved. Start_next_task is set when the current process is descheduled and cleared when the new process is started. An interrupt may occur between these two stages. Other bits are set to the values listed above. Comments: Secondar y instruction. Deschedules the current process. This instruction must not be used in an exception handler. See also: dequeue enqueue run wait Chapter 7 . |
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