From aa9f82fcf2a5a1586f74b0afa58ffb0bfc0cd1cb Mon Sep 17 00:00:00 2001
From: Rafael França <rafaelmfranca@gmail.com>
Date: Thu, 10 Nov 2016 13:44:44 -0500
Subject: Merge pull request #1080 from sophiedeziel/master

Prevent exception caused by a race condition on multi-threaded servers
---
 lib/rack/server.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/rack/server.rb b/lib/rack/server.rb
index 2253b314..2d36eb6d 100644
--- a/lib/rack/server.rb
+++ b/lib/rack/server.rb
@@ -1,4 +1,5 @@
 require 'optparse'
+require 'fileutils'
 
 
 module Rack
@@ -352,7 +353,7 @@ module Rack
 
       def write_pid
         ::File.open(options[:pid], ::File::CREAT | ::File::EXCL | ::File::WRONLY ){ |f| f.write("#{Process.pid}") }
-        at_exit { ::File.delete(options[:pid]) if ::File.exist?(options[:pid]) }
+        at_exit { ::FileUtils.rm_f(options[:pid]) }
       rescue Errno::EEXIST
         check_pid!
         retry
-- 
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