Removed unused utilities

Change-Id: Ifa3e7b820d594303c6c02eae12f55bce2bd1dacc

taskflow/tests/utils.py

@@ -25,22 +25,6 @@ KWARGS_KEY = '__kwargs__'
 ORDER_KEY = '__order__'
 
 
-def close_all(*args):
-    for a in args:
-        if not a:
-            continue
-        a.close()
-
-
-def null_functor(*args, **kwargs):  # pylint: disable=W0613
-    return None
-
-
-def drain(lst):
-    while len(lst):
-        lst.pop()
-
-
 def make_reverting_task(token, blowup=False):
 
     def do_revert(context, *args, **kwargs):

taskflow/utils/threading_utils.py

@@ -20,7 +20,6 @@ import logging
 import multiprocessing
 import six
 import threading
-import time
 import types
 
 from taskflow.utils import lock_utils
@@ -28,26 +27,6 @@ from taskflow.utils import lock_utils
 LOG = logging.getLogger(__name__)
 
 
-def await(check_functor, timeout=None):
-    """Spin-loops + sleeps awaiting for a given functor to return true."""
-    if timeout is not None:
-        end_time = time.time() + max(0, timeout)
-    else:
-        end_time = None
-    # Use the same/similar scheme that the python condition class uses.
-    delay = 0.0005
-    while not check_functor():
-        time.sleep(delay)
-        if end_time is not None:
-            remaining = end_time - time.time()
-            if remaining <= 0:
-                return False
-            delay = min(delay * 2, remaining, 0.05)
-        else:
-            delay = min(delay * 2, 0.05)
-    return True
-
-
 def get_optimal_thread_count():
     """Try to guess optimal thread count for current system."""
     try:
@@ -59,42 +38,6 @@ def get_optimal_thread_count():
         return 2
 
 
-class CountDownLatch(object):
-    """Similar in concept to the java count down latch."""
-
-    def __init__(self, count=0):
-        self.count = count
-        self.lock = threading.Condition()
-
-    def countDown(self):
-        with self.lock:
-            self.count -= 1
-            if self.count <= 0:
-                self.lock.notifyAll()
-
-    def await(self, timeout=None):
-        end_time = None
-        if timeout is not None:
-            timeout = max(0, timeout)
-            end_time = time.time() + timeout
-        time_up = False
-        with self.lock:
-            while True:
-                # Stop waiting on these 2 conditions.
-                if time_up or self.count <= 0:
-                    break
-                # Was this a spurious wakeup or did we really end??
-                self.lock.wait(timeout=timeout)
-                if end_time is not None:
-                    if time.time() >= end_time:
-                        time_up = True
-                    else:
-                        # Reduce the timeout so that we don't wait extra time
-                        # over what we initially were requested to.
-                        timeout = end_time - time.time()
-            return self.count <= 0
-
-
 class ThreadSafeMeta(type):
     """Metaclass that adds locking to all pubic methods of a class"""