Fix Rack::Lock to handle unexpected exceptions

* If an exception occurs after @app#call but before the response can be
  returned then the mutex should be unlocked.

1 files changed, 8 insertions, 0 deletions

diff --git a/test/spec_lock.rb b/test/spec_lock.rb
index 099e806c..2ed44b92 100644
--- a/test/spec_lock.rb
+++ b/test/spec_lock.rb
@@ -187,4 +187,12 @@ describe Rack::Lock do
     response = app.call(Rack::MockRequest.env_for("/"))[2]
     response.env['rack.multithread'].should.equal false
   end
+
+  should "unlock if an exception occurs before returning" do
+    lock = Lock.new
+    env  = Rack::MockRequest.env_for("/")
+    app  = lock_app(proc { [].freeze }, lock)
+    lambda { app.call(env) }.should.raise(Exception)
+    lock.synchronized.should.equal false
+  end
 end