From 57655d8153c3976ce14985f67417e2dc1a50095e Mon Sep 17 00:00:00 2001
From: Robert Collins <robertc@robertcollins.net>
Date: Tue, 13 Feb 2018 13:47:59 +1300
Subject: [PATCH] Use AtomicUsize properly

doing a read+write on an atomic int will lose updates from other threads.
---
 guide/src/qs_4.md | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/guide/src/qs_4.md b/guide/src/qs_4.md
index e7193ae55..a8424a4a0 100644
--- a/guide/src/qs_4.md
+++ b/guide/src/qs_4.md
@@ -89,8 +89,7 @@ impl<S> Handler<S> for MyHandler {
 
     /// Handle request
     fn handle(&mut self, req: HttpRequest<S>) -> Self::Result {
-        let num = self.0.load(Ordering::Relaxed) + 1;
-        self.0.store(num, Ordering::Relaxed);
+        self.0.fetch_add(1, Ordering::Relaxed);
         httpcodes::HTTPOk.into()
     }
 }