manager.rb in newrelic_rpm-9.8.0

- old
+ new

@@ -32,10 +32,11 @@
         end
 
         def initialize
           reset_to_defaults
           @callbacks = Hash.new { |hash, key| hash[key] = [] }
+          @lock = Mutex.new
         end
 
         def add_config_for_testing(source, level = 0)
           raise 'Invalid config type for testing' unless [Hash, DottedHash].include?(source.class)
 
@@ -362,12 +363,14 @@
         # reset the configuration hash, but do not replace previously auto
         # determined dependency detection values with nil or 'auto'
         def reset_cache
           return new_cache unless defined?(@cache) && @cache
 
-          preserved = @cache.dup.select { |_k, v| DEPENDENCY_DETECTION_VALUES.include?(v) }
-          new_cache
-          preserved.each { |k, v| @cache[k] = v }
+          @lock.synchronize do
+            preserved = @cache.dup.select { |_k, v| DEPENDENCY_DETECTION_VALUES.include?(v) }
+            new_cache
+            preserved.each { |k, v| @cache[k] = v }
+          end
 
           @cache
         end
 
         def new_cache