From 798cbfd84391ad381b3b9689753ede9b69f59f02 Mon Sep 17 00:00:00 2001
From: "Tate, Hongliang Tian" <tate.thl@antfin.com>
Date: Sat, 14 Nov 2020 05:00:30 +0000
Subject: [PATCH] Fix pushing/popping zero-length slices to/from Channel

---
 src/libos/src/fs/channel.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/libos/src/fs/channel.rs b/src/libos/src/fs/channel.rs
index 3b266c9d..6574450f 100644
--- a/src/libos/src/fs/channel.rs
+++ b/src/libos/src/fs/channel.rs
@@ -280,6 +280,10 @@ impl<I> Producer<I> {
 
 impl<I: Copy> Producer<I> {
     pub fn push_slice(&self, items: &[I]) -> Result<usize> {
+        if items.len() == 0 {
+            return Ok(0);
+        }
+
         waiter_loop!(
             {
                 let mut rb_producer = self.inner.lock().unwrap();
@@ -377,6 +381,10 @@ impl<I> Consumer<I> {
 
 impl<I: Copy> Consumer<I> {
     pub fn pop_slice(&self, items: &mut [I]) -> Result<usize> {
+        if items.len() == 0 {
+            return Ok(0);
+        }
+
         waiter_loop!(
             {
                 let mut rb_consumer = self.inner.lock().unwrap();