From 17b9035bcd162f59e1a1247d4a755124c37052c5 Mon Sep 17 00:00:00 2001
From: Carl Jackson <carl@avtok.com>
Date: Mon, 28 Jul 2014 02:12:27 -0700
Subject: [PATCH] Add App Engine support

App Engine disallows package unsafe. As a workaround for the (unsafe)
RCU atomic pointer shenanigans we pull in order to avoid taking a lock
in the hot routing path, let's just grab the lock. Honestly, I doubt
anyone will notice anyways, especially considering the fact that App
Engine is single-threaded anyways.

Fixes #52.
---
 web/atomic.go           |  2 ++
 web/atomic_appengine.go | 14 ++++++++++++++
 2 files changed, 16 insertions(+)
 create mode 100644 web/atomic_appengine.go

diff --git a/web/atomic.go b/web/atomic.go
index aab483a..795d8e5 100644
--- a/web/atomic.go
+++ b/web/atomic.go
@@ -1,3 +1,5 @@
+// +build !appengine
+
 package web
 
 import (
diff --git a/web/atomic_appengine.go b/web/atomic_appengine.go
new file mode 100644
index 0000000..027127a
--- /dev/null
+++ b/web/atomic_appengine.go
@@ -0,0 +1,14 @@
+// +build appengine
+
+package web
+
+func (rt *router) getMachine() *routeMachine {
+	rt.lock.Lock()
+	defer rt.lock.Unlock()
+	return rt.machine
+}
+
+// We always hold the lock when calling setMachine.
+func (rt *router) setMachine(m *routeMachine) {
+	rt.machine = m
+}