Function glib::source::timeout_add_seconds_once

pub fn timeout_add_seconds_once<F>(interval: u32, func: F) -> SourceId where
    F: FnOnce() + Send + 'static, 

Adds a closure to be called by the default main loop at regular intervals with second granularity.

func will be called repeatedly every interval seconds until it returns Continue(false). Precise timing is not guaranteed, the timeout may be delayed by other events.

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

In comparison to timeout_add_seconds(), this only requires func to be FnOnce, and will automatically return Continue(false).