semaphore - определение. Что такое semaphore
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Что (кто) такое semaphore - определение


semaphore         
  • Heliograph
  • alphabet]]
  • Railway pivot arms
  • Napoleonic semaphore line
  • Sailor with signal lamp
  • Electric telegraph
MECHANICAL APPARATUS USED TO SEND MESSAGES
Semaphor
n.
Telegraph.
semaphore         
  • Heliograph
  • alphabet]]
  • Railway pivot arms
  • Napoleonic semaphore line
  • Sailor with signal lamp
  • Electric telegraph
MECHANICAL APPARATUS USED TO SEND MESSAGES
Semaphor
Semaphore is a system of sending messages by using two flags. You hold a flag in each hand and move your arms to various positions representing different letters of the alphabet.
N-UNCOUNT
semaphore         
  • Heliograph
  • alphabet]]
  • Railway pivot arms
  • Napoleonic semaphore line
  • Sailor with signal lamp
  • Electric telegraph
MECHANICAL APPARATUS USED TO SEND MESSAGES
Semaphor
<programming, operating system> The classic method for 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 = s+1; } 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-waiting, 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)

Википедия

Semaphore
Semaphore (; ()|mark, sign, token|el| ()|bearer, carrier}}) is the use of an apparatus to create a visual signal transmitted over distance. A semaphore can be performed with devices including: fire, lights, flags, sunlight, and moving arms.
Примеры употребления для semaphore
1. On first meeting, he gave no semaphore of greeting – no handshake, no smile, no small talk.
2. Project Semaphore The first phase of the e–borders programme started its pilot scheme in December.
3. Then there is a bizarre missing person‘s report, filed in semaphore and Arabic.
4. Earning a coveted Scout badge used to involve tying knots, lighting campfires and mastering the art of semaphore.
5. In a specially organised tribute, a silent message of remembrance was passed down the River Thames using semaphore.