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ST20C2 数据表(PDF) 162 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 162 Page - STMicroelectronics |
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162 / 212 page ![]() signal ® 162/212 signal signal Code: 60 F4 Description: Signal (or V) on the semaphore pointed to by Areg. If no process is waiting then the count is incremented, otherwise the first process on the semaphore list is rescheduled. Definition: if (word[Areg @ s.Front] = NotProcess.p) word ′[Areg @ s.Count] ← word[Areg @ s.Count] + 1 else Remove the process from the front of the semaphore list and put it on the scheduling list Areg ′← undefined Breg ′← undefined Creg ← undefined Error signals: Can cause the Signal trap to be signalled if a process is rescheduled. Comments: Secondar y instruction. Count increment is unchecked. See also: wait |
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