Function glib::source::unix_signal_add

pub fn unix_signal_add<F>(signum: i32, func: F) -> SourceId where
    F: FnMut() -> Continue + Send + 'static, 

Adds a closure to be called by the default main loop whenever a UNIX signal is raised.

func will be called repeatedly every time signum is raised until it returns Continue(false).

The default main loop almost always is the main loop of the main thread. Thus, the closure is called on the main thread.