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src
mongo
util
timer-inl.h
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// @file mongo/util/timer-inl.h
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/* Copyright 2010 10gen Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "mongo/config.h"
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#if defined(MONGO_HAVE_HEADER_UNISTD_H)
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#include <unistd.h>
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#endif
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#if defined(_WIN32)
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// On Windows, prefer the Windows-specific implementation, which employs QueryPerformanceCounter.
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#include "mongo/util/timer-win32-inl.h"
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#elif defined(_POSIX_TIMERS) and _POSIX_TIMERS > 0 and defined(_POSIX_MONOTONIC_CLOCK) and \
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_POSIX_MONOTONIC_CLOCK > 0
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// On systems that support the POSIX clock_gettime function, and the "monotonic" clock,
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// use those.
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#include "mongo/util/timer-posixclock-inl.h"
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#else
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// If all else fails, fall back to a generic implementation. Performance may suffer.
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#include "mongo/util/timer-generic-inl.h"
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#endif
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