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lock.py
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39 lines (33 loc) · 1.19 KB
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# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
from __future__ import absolute_import
import fcntl
import os
import time
import tempfile
from contextlib import contextmanager
DEFAULT_LOCK_PATH = os.path.join(tempfile.gettempdir(), "sagemaker_test_lock")
@contextmanager
def lock(path=DEFAULT_LOCK_PATH):
"""Create a file lock to control concurrent test execution. Certain tests or
test operations need to limit concurrency to work reliably. Examples include
local mode endpoint tests and vpc creation tests.
"""
f = open(path, "w")
fd = f.fileno()
fcntl.lockf(fd, fcntl.LOCK_EX)
try:
yield
finally:
time.sleep(5)
fcntl.lockf(fd, fcntl.LOCK_UN)