Shell Programming and Scripting

Great!! I tried your programme and it didn't have any problem with the number it started. Try adding set -x at the top of your script which might give you a clue as to why it's not stopping

Ok, I will try ^^

So with you, the process that got the lock are differents???

Yes, all of the processes eventually grab the lock. However, the same process has a very good chance of grabbing the lock every time until it reaches the max tries on the loop. The reason for this is that when a process releases the lock it loops and immediately tries to get the lock again. Unless one of the other processes loops at exactly the same time, the process that just released the lock will acquire the lock again.

Try adding a sleep 5 immediately after the lock is released. This will allow one of the other processes to grab the lock before the process that just released the lock loops and tries again. This probably isn't necessary in a real script where after getting the lock and updating the counter, the script goes off and does something that would take time rather than just looping to try to lock again.

Hope this makes sense.

I see yeah that make sense, I think that I don't need to put that sleep.
Now I see what's happening on my code with the set -x.

I think in the while true something is missing, because when one process reaches the max number this process goes off, but the others that are waiting for the lock immediately they go to the part to make the lock directory and do the other stuff and when it finishes they also go off.
So if I put 30 as max number and 5 processes, I always got 35 xDDDDD

Well I will try to do something tomorrow, now I'm a little tired

edit------------

Now it's working ^^ I just add another if on the while true xD
Thank you so much @agama I have learned a lot in this week =)