Reports a key that could not be locked.

This exception is returned by Mutex.lock/2 and raised by Mutex.lock!/2, Mutex.await/3, Mutex.await_all/2, Mutex.with_lock/4 and Mutex.with_lock_all/3.

The following fields are public:

• :key - the key that could not be locked.
• :cause - the reason why locking failed:
  • {:locked, owner_pid} - the key was locked by owner_pid when the mutex handled the request.
  • :self_deadlock - the calling process awaited a key that it already owns.