Vendor dependencies for 0.3.0 release

vendor/polling/tests/precision.rs

@@ -0,0 +1,72 @@
+use std::io;
+use std::time::{Duration, Instant};
+
+use polling::{Events, Poller};
+
+#[test]
+fn below_ms() -> io::Result<()> {
+    let poller = Poller::new()?;
+    let mut events = Events::new();
+
+    let dur = Duration::from_micros(100);
+    let margin = Duration::from_micros(500);
+    let mut lowest = Duration::from_secs(1000);
+
+    for _ in 0..1_000 {
+        let now = Instant::now();
+        let n = poller.wait(&mut events, Some(dur))?;
+        let elapsed = now.elapsed();
+
+        assert_eq!(n, 0);
+        assert!(elapsed >= dur, "{elapsed:?} < {dur:?}");
+        lowest = lowest.min(elapsed);
+    }
+
+    if cfg!(all(
+        any(
+            target_os = "linux",
+            target_os = "android",
+            target_vendor = "apple",
+            target_os = "freebsd",
+        ),
+        not(polling_test_poll_backend)
+    )) {
+        assert!(lowest < dur + margin);
+    }
+    Ok(())
+}
+
+#[test]
+fn above_ms() -> io::Result<()> {
+    let poller = Poller::new()?;
+    let mut events = Events::new();
+
+    let dur = Duration::from_micros(3_100);
+    let margin = Duration::from_micros(500);
+    let mut lowest = Duration::from_secs(1000);
+
+    for _ in 0..1_000 {
+        let now = Instant::now();
+        let n = poller.wait(&mut events, Some(dur))?;
+        let elapsed = now.elapsed();
+
+        assert_eq!(n, 0);
+        assert!(elapsed >= dur, "{elapsed:?} < {dur:?}");
+        lowest = lowest.min(elapsed);
+    }
+
+    if cfg!(all(
+        any(
+            target_os = "linux",
+            target_os = "android",
+            target_os = "illumos",
+            target_os = "solaris",
+            target_vendor = "apple",
+            target_os = "freebsd",
+        ),
+        not(polling_test_poll_backend)
+    )) {
+        assert!(lowest < dur + margin);
+    }
+    Ok(())
+}