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Was (wer) ist semaphore - definition
semaphore
![alphabet]]](https://commons.wikimedia.org/wiki/Special:FilePath/Semaphore Signals A-Z.jpg?width=200 "alphabet]]")
MECHANICAL APPARATUS USED TO SEND MESSAGES
Semaphor
n.
Telegraph.
semaphore
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
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)
Wikipedia
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.
Beispiele aus Textkorpus für 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.