What is the a semaphore?

Answer 1

Some computer geek used the word semaphore instead of FLAG.

A flag or semaphore indicates that an event occurs. In most systems, this is associated with a specific interrupt type.

Good luck and Happy Computing!

Answer 2

In computer terms... it's a data structure that is used to control a resource.

It typically has a NAME and a VALUE - just like any other variable.. But - it is "seeded" with the value that is the maximum allowable.

Let's say you're trying to create a semaphore to protect a PRINTER. Let's say you don't want any more then 3 print jobs stacked up at a time.

You'd create a semaphore that contained the value 3, each process would decrement the counter... and when it got to ZERO the process would be denied.

When each process was finished with the printer, it would increment the counter... and the process will continue.

I hope that helps.

Answer 3

A semaphore is a message sent between ships using flags before radio signals were possible.

Answer 4

sem·a·phore (sm-fôr, -fr) KEY

NOUN:

A visual signaling apparatus with flags, lights, or mechanically moving arms, as one used on a railroad.
A visual system for sending information by means of two flags that are held one in each hand, using an alphabetic code based on the position of the signaler's arms.
tr. & intr.v.
sem·a·phored , sem·a·phor·ing , sem·a·phores
To send (a message) or to signal by semaphore.

Answer 5

Semaphore is a system of signals using flags - www.anbg.gov.au/flags/semaphore.this website will give you more info-
www.anbg.gov.au/flags/semaphore.
In computing terms - clueless!!!

Answer 6

Here goes...

Pronunciation: 'se-m&-"for
Function: noun
Etymology: Greek sEma sign, signal + International Scientific Vocabulary -phore
1 : an apparatus for visual signaling (as by the position of one or more movable arms)
2 : a system of visual signaling by two flags held one in each hand

Here is a picture: http://www.m-w.com/mw/art/semaphor.htm

Answer 7

I think it is a signal along railroad tracks to let train guys know if the road anead is clear. I remember seeing one that was like a long metal flag that moved up or down.