semaphore

[Diptiman Basak]

Hi,

Can you just brieg me about semaphore??

Dip

[Mel Burslan]

semaphore is roughly equal to a flag. It is either on or off depending upon a result of an expected event.

what exactly do you want to know ? unfortunately, no one here is psychic, but Clay sometimes uses the force to read people's mind :) I'll imitate him and using the force of Jedi order, I'll assume that you want to know about semaphore related kernel parameters but you still need to be more detailed than "brief me about semaphore". Tell us what your problem or question is, in detail.

[Joseph Loo]

hi dip,

refer to this post:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=3865

it should have what u need.

regards.
(p.s. please remember to assign points)

[Vibhor Kumar Agarwal · Accepted solution]

In simplest terms semaphore is a tag or variable just to keep track of concurrent access of a resource.

Whenever a process tries to access a resource it checks that semaphore, if it has a specific value then it uses that resource otherwise it waits for it.

eg. dozen of process waiting to write a file.