e9a319d7d3
Switch to using a reader/writer lock scheme to protect against simultaneous storage mutations, typically seen when running in a multi-threaded mode. For the single-threaded mode provide a dummy reader/writer lock which will mimic the locking api but not actually lock anything. Closes-Bug: 1273146 Change-Id: I954f542d9ab34b693e8da71c9fc913f823e869ba
39 lines
1.2 KiB
Python
39 lines
1.2 KiB
Python
# -*- coding: utf-8 -*-
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (C) 2013 Yahoo! Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import multiprocessing
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import six
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if six.PY2:
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from thread import get_ident # noqa
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else:
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# In python3+ the get_ident call moved (whhhy??)
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from threading import get_ident # noqa
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def get_optimal_thread_count():
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"""Try to guess optimal thread count for current system."""
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try:
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return multiprocessing.cpu_count() + 1
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except NotImplementedError:
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# NOTE(harlowja): apparently may raise so in this case we will
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# just setup two threads since its hard to know what else we
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# should do in this situation.
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return 2
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