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semaphore n. 臂式號志,信號,手旗信號
vt. 以信號機聯絡 vi. 打信號 臂式號志,信號,手旗信號以信號機聯絡打信號 semaphore 信號; 信號標誌; 信號燈 semaphore 旗號 semaphore n 1: an apparatus for visual signaling with lights or mechanically moving arms v 1: send signals by or as if by semaphore 2: convey by semaphore, of information Semaphore \Sem"a*phore\, n. [Gr. sh^ma a sign fe`rein to bear: cf. F. s['e]maphore.] A signal telegraph; an apparatus for giving signals by the disposition of lanterns, flags, oscillating arms, etc. [1913 Webster] Semaphoric 72 Moby Thesaurus words for "semaphore": Roman candle, aid to navigation, alarm, amber light, balefire, beacon, beacon fire, bell, bell buoy, blinker, blue peter, buoy, caution light, flare, fog bell, fog signal, fog whistle, foghorn, glance, go light, gong buoy, green light, heliograph, high sign, international alphabet flag, international numeral pennant, kick, leer, marker beacon, nod, nudge, parachute flare, pilot flag, poke, police whistle, quarantine flag, radio beacon, red flag, red light, rocket, sailing aid, semaphore flag, semaphore telegraph, sign, signal, signal beacon, signal bell, signal fire, signal flag, signal gong, signal gun, signal lamp, signal light, signal mast, signal post, signal rocket, signal shot, signal siren, signal tower, spar buoy, stop light, the nod, the wink, touch, traffic light, traffic signal, watch fire, white flag, wigwag, wigwag flag, wink, yellow flag restricting access to shared resources (e.g. storage) in a {multi-processing} environment. They were invented by {Dijkstra} and first used in {T.H.E} {operating system}. A semaphore is a {protected variable} (or {abstract data type}) which can only be accessed using the following operations: P(s) Semaphore s; { while (s == 0) ; /* wait until s>0 */ s = s-1; } V(s) Semaphore s; { s = s1; } Init(s, v) Semaphore s; Int v; { s = v; } P and V stand for Dutch "Proberen", to test, and "Verhogen", to increment. The value of a semaphore is the number of units of the resource which are free (if there is only one resource a "binary semaphore" with values 0 or 1 is used). The P operation {busy-waits} (or maybe {sleeps}) until a resource is available whereupon it immediately claims one. V is the inverse, it simply makes a resource available again after the process has finished using it. Init is only used to initialise the semaphore before any requests are made. The P and V operations must be {indivisible}, i.e. no other process can access the semaphore during the their execution. To avoid {busy-wait}ing, a semaphore may have an associated {queue} of processes (usually a {FIFO}). If a process does a P on a semaphore which is zero the process is added to the semaphore's queue. When another process increments the semaphore by doing a V and there are tasks on the queue, one is taken off and resumed. (1995-02-01)
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