1 files changed, 5 insertions, 5 deletions
diff --git a/activesupport/lib/active_support/file_evented_update_checker.rb b/activesupport/lib/active_support/file_evented_update_checker.rb
index 638458c6ce..bb0f26f874 100644
--- a/activesupport/lib/active_support/file_evented_update_checker.rb
+++ b/activesupport/lib/active_support/file_evented_update_checker.rb
@@ -1,6 +1,7 @@
 require 'listen'
 require 'set'
 require 'pathname'
+require 'concurrent/atomic/atomic_boolean'
 
 module ActiveSupport
   class FileEventedUpdateChecker #:nodoc: all
@@ -14,7 +15,7 @@ module ActiveSupport
       end
 
       @block   = block
-      @updated = false
+      @updated = Concurrent::AtomicBoolean.new(false)
       @lcsp    = @ph.longest_common_subpath(@dirs.keys)
 
       if (dtw = directories_to_watch).any?
@@ -23,13 +24,12 @@ module ActiveSupport
     end
 
     def updated?
-      @updated
+      @updated.true?
     end
 
     def execute
+      @updated.make_false
       @block.call
-    ensure
-      @updated = false
     end
 
     def execute_if_updated
@@ -43,7 +43,7 @@ module ActiveSupport
 
       def changed(modified, added, removed)
         unless updated?
-          @updated = (modified + added + removed).any? { |f| watching?(f) }
+          @updated.make_true if (modified + added + removed).any? { |f| watching?(f) }
         end
       end