1 files changed, 78 insertions, 0 deletions
diff --git a/vendor/parking_lot_core-0.8.6/src/thread_parker/generic.rs b/vendor/parking_lot_core-0.8.6/src/thread_parker/generic.rs
new file mode 100644
index 000000000..5236e14ab
--- /dev/null
+++ b/vendor/parking_lot_core-0.8.6/src/thread_parker/generic.rs
@@ -0,0 +1,78 @@
+// Copyright 2016 Amanieu d'Antras
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+//! A simple spin lock based thread parker. Used on platforms without better
+//! parking facilities available.
+
+use core::sync::atomic::{spin_loop_hint, AtomicBool, Ordering};
+use instant::Instant;
+use std::thread;
+
+// Helper type for putting a thread to sleep until some other thread wakes it up
+pub struct ThreadParker {
+    parked: AtomicBool,
+}
+
+impl super::ThreadParkerT for ThreadParker {
+    type UnparkHandle = UnparkHandle;
+
+    const IS_CHEAP_TO_CONSTRUCT: bool = true;
+
+    #[inline]
+    fn new() -> ThreadParker {
+        ThreadParker {
+            parked: AtomicBool::new(false),
+        }
+    }
+
+    #[inline]
+    unsafe fn prepare_park(&self) {
+        self.parked.store(true, Ordering::Relaxed);
+    }
+
+    #[inline]
+    unsafe fn timed_out(&self) -> bool {
+        self.parked.load(Ordering::Relaxed) != false
+    }
+
+    #[inline]
+    unsafe fn park(&self) {
+        while self.parked.load(Ordering::Acquire) != false {
+            spin_loop_hint();
+        }
+    }
+
+    #[inline]
+    unsafe fn park_until(&self, timeout: Instant) -> bool {
+        while self.parked.load(Ordering::Acquire) != false {
+            if Instant::now() >= timeout {
+                return false;
+            }
+            spin_loop_hint();
+        }
+        true
+    }
+
+    #[inline]
+    unsafe fn unpark_lock(&self) -> UnparkHandle {
+        // We don't need to lock anything, just clear the state
+        self.parked.store(false, Ordering::Release);
+        UnparkHandle(())
+    }
+}
+
+pub struct UnparkHandle(());
+
+impl super::UnparkHandleT for UnparkHandle {
+    #[inline]
+    unsafe fn unpark(self) {}
+}
+
+#[inline]
+pub fn thread_yield() {
+    thread::yield_now();
+}