Need to initialize @mutex and @proceed before calling start_server() to avoid possible thread-race

Author: os97673

lib/ruby-debug-ide.rb

@@ -66,13 +66,13 @@ def start_server(host = nil, port = 1234, notify_dispatcher = false)
     end
 
     def prepare_debugger(options)
+      @mutex = Mutex.new
+      @proceed = ConditionVariable.new
+
       start_server(options.host, options.port, options.notify_dispatcher)
 
       raise "Control thread did not start (#{@control_thread}}" unless @control_thread && @control_thread.alive?
 
-      @mutex = Mutex.new
-      @proceed = ConditionVariable.new
-
       # wait for 'start' command
       @mutex.synchronize do
         @proceed.wait(@mutex)