Function libpulse_sys::mainloop::threaded::pa_threaded_mainloop_once_unlocked

pub unsafe extern "C" fn pa_threaded_mainloop_once_unlocked(
    m: *mut pa_threaded_mainloop, 
    callback: extern "C" fn(m: *mut pa_threaded_mainloop, userdata: *mut c_void), 
    userdata: *mut c_void
)

This is supported on crate feature pa_v13 only.