Beat Küng 0687fd2689 lockstep_scheduler: avoid pthread_cond_destroy on at_exit
The static object is destroyed on at_exit while threads might still be
inside a CS. This can lead to a hanging process.
Cleaner would be to gracefully stop the threads.

According to https://linux.die.net/man/3/pthread_cond_destroy:
Attempting to destroy a condition variable upon which other threads are
currently blocked results in undefined behavior.
2023-01-30 11:45:02 +01:00
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