workflow-egui 0.19.0

Components for EGUI-based applications
Documentation 
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use crate::imports::*;

/// Installs and tracks a Ctrl-C / SIGTERM handler that escalates from a
/// graceful shutdown, to an abort, to an immediate process exit on repeated
/// signals.
pub struct Signals {
    runtime: Runtime,
    iterations: AtomicU64,
}

impl Signals {
    /// Registers the OS signal handler bound to the given runtime.
    pub fn bind(runtime: &Runtime) {
        let signals = Arc::new(Signals {
            runtime: runtime.clone(),
            iterations: AtomicU64::new(0),
        });

        ctrlc::set_handler(move || {
            let v = signals.iterations.fetch_add(1, Ordering::SeqCst);

            match v {
                0 => {
                    // post a graceful exit event to the main event loop
                    println!("^SIGTERM - shutting down...");
                    signals
                        .runtime
                        .try_send_runtime_event(RuntimeEvent::Exit)
                        .unwrap_or_else(|e| {
                            println!("Error sending exit event: {:?}", e);
                        });
                }
                1 => {
                    // start runtime abort sequence
                    // (attempt to gracefully shutdown kaspad if running)
                    // this will execute process::exit(1) after 5 seconds
                    println!("^SIGTERM - aborting...");
                    Runtime::abort();
                }
                _ => {
                    // exit the process immediately
                    println!("^SIGTERM - halting");
                    std::process::exit(1);
                }
            }
        })
        .expect("Error setting signal handler");
    }
}