Function call_asap 

pub fn call_asap<F: FnOnce() + 'static>(f: F) -> Result<(), MainLoopError>

Runs a function as soon as possible, i e, when the main loop runs.

Corresponding platform specific APIs:

• glib: g_idle_add
• node.js: process.nextTick
• web: Promise.resolve().then(…)
• win32: PostMessage