c++ Make sure hardware gets accessed only by one program

Asked Sep 13 '14 at 11:01

Active Sep 13 '14 at 11:56

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I am currently working with a raspberry pi.

I have written a simple library to control a 7 segment display and it works fine. I also made several programs that use the library.

I need to make sure that at any time only one program is trying to control the gpio's. My first idea was to create a lock on a specific file.
How good practice is this and what's the best way to completely realize that?

(To clear this up: I do not neccesarrily want to block all programms from using the gpio's. It would be enough if only one program using my library could acces the gpio's)

edited Sep 13 '14 at 11:56

asked Sep 13 '14 at 11:01

BrainStone

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I think that making files to signal that something is in use at the moment is common on Linux. – GingerPlusPlus Sep 13 '14 at 11:07
That's true. I have seen this many times. I'm still not entirly sure if this the best practise in this case... – BrainStone Sep 13 '14 at 11:08
How do you access the gpio? – edmz Sep 13 '14 at 11:42
Using the [WiringPi API](http://wiringpi.com/) – BrainStone Sep 13 '14 at 11:54
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If you decide to go with file locking, here is a good discussion: http://stackoverflow.com/questions/575328/fcntl-lockf-which-is-better-to-use-for-file-locking – Erik Alapää Sep 13 '14 at 12:27
So is it "good" practise? – BrainStone Sep 15 '14 at 16:52

c++ Make sure hardware gets accessed only by one program

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