The ladebug dubugger provides commands to display the state of threads, mutexes, and condition variables, without using the built- in DECthreads debug facility.
Using the ladebug commands, you can examine core files and remote debug sessions, as well as run processes.
The basic commands are:
thread   - Sets the current thread context to show thread [...]    - Displays thread state (more
   information displayed if $verbose=1)
   show mutex [...]    - Display mutex state.
   show condition [...]    - Display condition variable
   state.
   Refer to the ladebug documentation for further details.