diff --git a/Lib/threading.py b/Lib/threading.py

index cb49c4a..c9795a5 100644

--- a/Lib/threading.py

+++ b/Lib/threading.py

@@ -305,7 +305,7 @@ class _Condition(_Verbose):

         else:

             return True

-    def wait(self, timeout=None):

+    def wait(self, timeout=None, balancing=True):

         """Wait until notified or until a timeout occurs.

         If the calling thread has not acquired the lock when this method is

@@ -354,7 +354,10 @@ class _Condition(_Verbose):

                     remaining = endtime - _time()

                     if remaining <= 0:

                         break

-                    delay = min(delay * 2, remaining, .05)

+                    if balancing:

+                        delay = min(delay * 2, remaining, 0.05)

+                    else:

+                        delay = remaining

                     _sleep(delay)

                 if not gotit:

                     if __debug__:

@@ -599,7 +602,7 @@ class _Event(_Verbose):

         with self.__cond:

             self.__flag = False

-    def wait(self, timeout=None):

+    def wait(self, timeout=None, balancing=True):

         """Block until the internal flag is true.

         If the internal flag is true on entry, return immediately. Otherwise,

@@ -617,7 +620,7 @@ class _Event(_Verbose):

         """

         with self.__cond:

             if not self.__flag:

-                self.__cond.wait(timeout)

+                self.__cond.wait(timeout, balancing)

             return self.__flag

 # Helper to generate new thread names

@@ -908,7 +911,7 @@ class Thread(_Verbose):

             if 'dummy_threading' not in _sys.modules:

                 raise

-    def join(self, timeout=None):

+    def join(self, timeout=None, balancing=True):

         """Wait until the thread terminates.

         This blocks the calling thread until the thread whose join() method is

@@ -957,7 +960,7 @@ class Thread(_Verbose):

                         if __debug__:

                             self._note("%s.join(): timed out", self)

                         break

-                    self.__block.wait(delay)

+                    self.__block.wait(delay, balancing)

                 else:

                     if __debug__:

                         self._note("%s.join(): thread stopped", self)

@@ -1143,7 +1146,7 @@ class _DummyThread(Thread):

     def _set_daemon(self):

         return True

-    def join(self, timeout=None):

+    def join(self, timeout=None, balancing=True):

         assert False, "cannot join a dummy thread"