concurrent/cached_value.rb: Add comment about volatility

glebm · Sep 18, 2018 · 6e2017e · 6e2017e
1 parent d9244f7
commit 6e2017e
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/lib/i18n/tasks/concurrent/cached_value.rb b/lib/i18n/tasks/concurrent/cached_value.rb
@@ -13,6 +13,11 @@ class CachedValue
     def initialize(&computation)
       @computation = computation
       @mutex = Mutex.new
+
+      # Ruby instance variables are currently implicitly "volatile" in all major implementations, see:
+      # https://bugs.ruby-lang.org/issues/11539
+      #
+      # If the Ruby specification changes, this variable must be marked "volatile".
       @result = NULL
     end