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ST20-C1 Datasheet(PDF) 159 Page - STMicroelectronics |
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ST20-C1 Datasheet(HTML) 159 Page - STMicroelectronics |
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159 / 205 page  159/205 8 Instruction Set Reference ® timeslice timeslice Code: FE Description: Deschedules the current process and starts the next task if a timeslice is due and timeslicing is enabled. This instruction is implemented in two stages to protect interrupt latency. The first stage deschedules the current process (even if the queue is empty), adds it to the back of the scheduling queue and sets the start_next_task status bit. The second stage clears the start_next_task status bit and starts the next process from the scheduling queue. An interrupt may occur between the two stages. Definition: if ( Statustimeslicing enabled and Statustimeslice_count=0 ) { if ( timeslice trap installed) take timeslice trap else { -- save state of current process word ′[Tdesc @ pw.Iptr] ← next instruction word ′[Tdesc @ pw.Wptr] ← Wptr if (frontptr ≠ NotProcess) --queue not empty { -- add current process to scheduling queue word ′[backptr @ pw.Link] ← Tdesc word ′[SchedulerQptr @ q.BPtrLoc] ← Tdesc -- remove front process from queue word ′[SchedulerQptr @ q.FPtrLoc] ← word[frontptr @ pw.Link] -- start next process from scheduling queue Tdesc ′← frontptr Wptr ′← word [frontptr @ pw.Wptr] Iptr ′← word [frontptr @ pw.Iptr] } Status ′ local_interrupt_enable ← set Status ′ overflow ← clear Status ′ undeflo w ← clear Status ′ carry ← clear Status ′ user_mode ← set Status ′ interrupt_mode ← clear Status ′ trap_mode ← clear Status ′ sleep ← clear Status ′ start_next_task ← clear |
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