Sets a group of functions that Libevent should use for condition variables.
For full information on the required callback API, see the
documentation for the individual members of evthread_condition_callbacks.
Note that if you're using Windows or the Pthreads threading library, you
probably shouldn't call this function; instead, use
evthread_use_windows_threads() or evthread_use_pthreads() if you can.
Sets a group of functions that Libevent should use for condition variables. For full information on the required callback API, see the documentation for the individual members of evthread_condition_callbacks.
Note that if you're using Windows or the Pthreads threading library, you probably shouldn't call this function; instead, use evthread_use_windows_threads() or evthread_use_pthreads() if you can.