Mutex in shared memory when one user crashes?

Question

Suppose that a process is creating a mutex in shared memory and locking it and dumps core while the mutex is locked.

Now in another process how do I detect that mute

Answer 1

If you're working in Linux or something similar, consider using named semaphores instead of (what I assume are) pthreads mutexes. I don't think there is a way to determine the locking PID of a pthreads mutex, short of building your own registration table and also putting it in shared memory.