Backup commit

My backspace key started ghosting. Nothing works atm.

src/libs/scheduler/cancel_flag.rs

@@ -0,0 +1,23 @@
+//! Flag for cancelling scheduled operations
+
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::Arc;
+
+/// A single-fire thread-safe boolean flag with relaxed ordering
+#[derive(Debug, Clone)]
+pub struct CancelFlag(Arc<AtomicBool>);
+
+impl CancelFlag {
+  /// Create a new canceller
+  pub fn new() -> Self { CancelFlag(Arc::new(AtomicBool::new(false))) }
+
+  /// Check whether the operation has been cancelled
+  pub fn is_cancelled(&self) -> bool { self.0.load(Ordering::Relaxed) }
+
+  /// Cancel the operation
+  pub fn cancel(&self) { self.0.store(true, Ordering::Relaxed) }
+}
+
+impl Default for CancelFlag {
+  fn default() -> Self { Self::new() }
+}