tasks/updater/network.rb in bootstrap-4.0.0.alpha3 vs tasks/updater/network.rb in bootstrap-4.0.0.alpha3.1

@@ -1,10 +1,12 @@
 require 'shellwords'
 class Updater
   module Network
     protected
 
+    WRITE_FILES_MUTEX = Mutex.new
+
     def get_paths_by_type(dir, file_re, recursive = true)
       get_file_paths(dir, recursive).select { |path| path =~ file_re }
     end
 
     def get_file_paths(dir, recursive = true)
@@ -22,10 +24,10 @@
       files -= contents.keys
       log_http_get_files files, path_url, false
       files.map do |name|
         Thread.start {
           contents[name] = open("#{path_url}/#{name}").read
-          Thread.exclusive { write_cached_files path, name => contents[name] }
+          WRITE_FILES_MUTEX.synchronize { write_cached_files path, name => contents[name] }
         }
       end.each(&:join)
       contents
     end