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Club Amiga de Montreal - CAM
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018.lha
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prelude
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semaphore.st
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1986-10-19
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530b
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25 lines
Class Semaphore :List
| excessSignals |
[ new
excessSignals <- 0
| new: aNumber
excessSignals <- aNumber
| signal
<primitive 148>. "start atomic action"
(self isEmpty)
ifTrue: [excessSignals <- excessSignals + 1]
ifFalse: [self removeFirst unblock].
<primitive 149> "end atomic action"
| wait
<primitive 148>. "start atomic actions"
(excessSignals = 0)
ifTrue: [self addLast: selfProcess.
selfProcess block]
ifFalse: [excessSignals <- excessSignals - 1].
<primitive 149> "end atomic actions"
]