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dsger_W._Dijkstra|Edsger Dijkstra]] in the mid-1960s * Ben-Ari Ch 6 * slides: {{slides.pdf|PDF}} * begin slide 6.1, p. 105 * Two operations: * wait(s) * Trad... se") * Definition: <code text> < await (s > 0) s = s - 1; > </code> * signal(s) * Tr... nary semaphore: value is always either ''1'' or ''0'' * general semaphore: value is nonnegative