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- #!/usr/bin/env python
- # Copyright 2010 Google Inc. 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.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License 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.
- import threading
- class DaemonServer(object):
- """Base class which manages creation and cleanup of daemon style servers."""
- def __enter__(self):
- # TODO: Because of python's Global Interpreter Lock (GIL), the threads
- # will run on the same CPU. Consider using processes instead because
- # the components do not need to communicate with each other. On Linux,
- # "taskset" could be used to assign each process to specific CPU/core.
- # Of course, only bother with this if the processing speed is an issue.
- # Some related discussion: http://stackoverflow.com/questions/990102/python-
- # global-interpreter-lock-gil-workaround-on-multi-core-systems-using-tasks
- thread = threading.Thread(target=self.serve_forever)
- thread.daemon = True # Python exits when no non-daemon threads are left.
- thread.start()
- return self
- def __exit__(self, unused_exc_type, unused_exc_val, unused_exc_tb):
- self.cleanup()
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