Remove unused variables. (#612)

Signed-off-by: Chris Lalancette <[email protected]>

Author: clalancette

launch/launch/actions/execute_local.py

@@ -20,7 +20,6 @@
 import os
 import platform
 import signal
-import threading
 import traceback
 from typing import Any  # noqa: F401
 from typing import Callable
@@ -75,9 +74,6 @@
 from ..utilities.type_utils import normalize_typed_substitution
 from ..utilities.type_utils import perform_typed_substitution
 
-_global_process_counter_lock = threading.Lock()
-_global_process_counter = 0  # in Python3, this number is unbounded (no rollover)
-
 
 class ExecuteLocal(Action):
     """Action that begins executing a process on the local system and sets up event handlers."""

launch/launch/actions/execute_process.py

@@ -15,7 +15,6 @@
 """Module for the ExecuteProcess action."""
 
 import shlex
-import threading
 from typing import Dict
 from typing import Iterable
 from typing import List
@@ -31,9 +30,6 @@
 from ..some_substitutions_type import SomeSubstitutionsType
 from ..substitutions import TextSubstitution
 
-_global_process_counter_lock = threading.Lock()
-_global_process_counter = 0  # in Python3, this number is unbounded (no rollover)
-
 
 @expose_action('executable')
 class ExecuteProcess(ExecuteLocal):