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-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb1
-rw-r--r--activerecord/test/cases/locking_test.rb1
-rw-r--r--activesupport/lib/active_support/core_ext/module/synchronization.rb1
-rw-r--r--activesupport/test/core_ext/module/synchronization_test.rb1
4 files changed, 4 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
index ca9314ec99..cffa2387de 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb
@@ -1,3 +1,4 @@
+require 'thread'
require 'monitor'
require 'set'
require 'active_support/core_ext/module/synchronization'
diff --git a/activerecord/test/cases/locking_test.rb b/activerecord/test/cases/locking_test.rb
index 4ddcdc010b..f9678cb0c5 100644
--- a/activerecord/test/cases/locking_test.rb
+++ b/activerecord/test/cases/locking_test.rb
@@ -1,3 +1,4 @@
+require 'thread'
require "cases/helper"
require 'models/person'
require 'models/reader'
diff --git a/activesupport/lib/active_support/core_ext/module/synchronization.rb b/activesupport/lib/active_support/core_ext/module/synchronization.rb
index 38ce55f26e..ed16c2f71b 100644
--- a/activesupport/lib/active_support/core_ext/module/synchronization.rb
+++ b/activesupport/lib/active_support/core_ext/module/synchronization.rb
@@ -1,3 +1,4 @@
+require 'thread'
require 'active_support/core_ext/module/aliasing'
require 'active_support/core_ext/array/extract_options'
diff --git a/activesupport/test/core_ext/module/synchronization_test.rb b/activesupport/test/core_ext/module/synchronization_test.rb
index eb850893f0..6c407e2260 100644
--- a/activesupport/test/core_ext/module/synchronization_test.rb
+++ b/activesupport/test/core_ext/module/synchronization_test.rb
@@ -1,3 +1,4 @@
+require 'thread'
require 'abstract_unit'
require 'active_support/core_ext/class/attribute_accessors'