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-rw-r--r--activesupport/lib/active_support/cache/file_store.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/cache/file_store.rb b/activesupport/lib/active_support/cache/file_store.rb
index 9936b33e22..a1376ae52a 100644
--- a/activesupport/lib/active_support/cache/file_store.rb
+++ b/activesupport/lib/active_support/cache/file_store.rb
@@ -121,7 +121,7 @@ module ActiveSupport
# Lock a file for a block so only one process can modify it at a time.
def lock_file(file_name, &block) # :nodoc:
if File.exist?(file_name)
- File.open(file_name, 'r') do |f|
+ File.open(file_name, 'r+') do |f|
begin
f.flock File::LOCK_EX
yield