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ST20C2 Datasheet(PDF) 162 Page - STMicroelectronics

Part # ST20C2
Description  Instruction Set Reference Manual
PDF  212 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C2 Datasheet(HTML) 162 Page - STMicroelectronics

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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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