Implementing semaphore operations as system calls

deviantish · 11-01-2005, 12:16 AM

I have to design and implement a simple interface for initializing,acquiring and releasing semaphores and export these functions as system calls.

Please help me with where should i start from and what kind of issues i need to take care off.

any help at all will be appreciated.
thankyou

jonaskoelker · 11-01-2005, 09:24 PM

"I have to":
Something you are only doing because you gain some external benefit from it. This is typically said by people who would rather have other people do it for them, instead of learning from doing their own homework.

Don't help, folks.

I'd assume you have a TA you could ask instead.

-- Jonas Kölker, Devil's Dictionary Pastiche no. 1

PS. If my intuition is wrong, I apologise.

Wim Sturkenboom · 11-01-2005, 11:06 PM

@deviantish
So you're looking for something with semaphores. Look in /usr/include. I typed ls /usr/include/sem, pressed <tab> for autocompletion and it came up with the file semaphore.h.
Sounds like a good starting point to me. Open that file and find the function prototypes.
Once you know the function names, you can use man-pages and internet to get more information and examples.

@jonaskoelker
deviantish asks where to start, not to give the solution.
Sounds to me that he/she is willing to do some research but does not know where to start.

jonaskoelker · 11-01-2005, 11:53 PM

Wim: you're probably right. I should probably add "00 23 * * * killall elinks" to my crontab

deviantish · 11-15-2005, 03:55 AM

Thanx Wim atleast now i got something to start with : )