1 files changed, 98 insertions, 0 deletions
diff --git a/vendor/tokio/src/runtime/scheduler/inject/rt_multi_thread.rs b/vendor/tokio/src/runtime/scheduler/inject/rt_multi_thread.rs
new file mode 100644
index 000000000..07d1063c5
--- /dev/null
+++ b/vendor/tokio/src/runtime/scheduler/inject/rt_multi_thread.rs
@@ -0,0 +1,98 @@
+use super::{Shared, Synced};
+
+use crate::runtime::scheduler::Lock;
+use crate::runtime::task;
+
+use std::sync::atomic::Ordering::Release;
+
+impl<'a> Lock<Synced> for &'a mut Synced {
+    type Handle = &'a mut Synced;
+
+    fn lock(self) -> Self::Handle {
+        self
+    }
+}
+
+impl AsMut<Synced> for Synced {
+    fn as_mut(&mut self) -> &mut Synced {
+        self
+    }
+}
+
+impl<T: 'static> Shared<T> {
+    /// Pushes several values into the queue.
+    ///
+    /// # Safety
+    ///
+    /// Must be called with the same `Synced` instance returned by `Inject::new`
+    #[inline]
+    pub(crate) unsafe fn push_batch<L, I>(&self, shared: L, mut iter: I)
+    where
+        L: Lock<Synced>,
+        I: Iterator<Item = task::Notified<T>>,
+    {
+        let first = match iter.next() {
+            Some(first) => first.into_raw(),
+            None => return,
+        };
+
+        // Link up all the tasks.
+        let mut prev = first;
+        let mut counter = 1;
+
+        // We are going to be called with an `std::iter::Chain`, and that
+        // iterator overrides `for_each` to something that is easier for the
+        // compiler to optimize than a loop.
+        iter.for_each(|next| {
+            let next = next.into_raw();
+
+            // safety: Holding the Notified for a task guarantees exclusive
+            // access to the `queue_next` field.
+            unsafe { prev.set_queue_next(Some(next)) };
+            prev = next;
+            counter += 1;
+        });
+
+        // Now that the tasks are linked together, insert them into the
+        // linked list.
+        self.push_batch_inner(shared, first, prev, counter);
+    }
+
+    /// Inserts several tasks that have been linked together into the queue.
+    ///
+    /// The provided head and tail may be be the same task. In this case, a
+    /// single task is inserted.
+    #[inline]
+    unsafe fn push_batch_inner<L>(
+        &self,
+        shared: L,
+        batch_head: task::RawTask,
+        batch_tail: task::RawTask,
+        num: usize,
+    ) where
+        L: Lock<Synced>,
+    {
+        debug_assert!(unsafe { batch_tail.get_queue_next().is_none() });
+
+        let mut synced = shared.lock();
+        let synced = synced.as_mut();
+
+        if let Some(tail) = synced.tail {
+            unsafe {
+                tail.set_queue_next(Some(batch_head));
+            }
+        } else {
+            synced.head = Some(batch_head);
+        }
+
+        synced.tail = Some(batch_tail);
+
+        // Increment the count.
+        //
+        // safety: All updates to the len atomic are guarded by the mutex. As
+        // such, a non-atomic load followed by a store is safe.
+        let len = self.len.unsync_load();
+
+        self.len.store(len + num, Release);
+    }
+}