How do I recover a semaphore when the process that decremented it to zero crashes?

Question

I have multiple apps compiled with g++, running in Ubuntu. I\'m using named semaphores to co-ordinate between different processes.

All works fine except in

Answer 1

You should be able to find it from the shell using lsof. Then possibly you can delete it?

Update

Ah yes... man -k semaphore to the rescue.

It seems you can use ipcrm to get rid of a semaphore. Seems you aren't the first with this problem.