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// Copyright 2008, Google Inc.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// 3. Neither the name of Google Inc. nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// This file is used by both Linux and OSX.
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// TODO(cprince): remove platform-specific #ifdef guards when OS-specific
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// sources (e.g. LINUX_CPPSRCS) are implemented
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#if defined(LINUX) || defined(OS_MACOSX) || defined(ANDROID)
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#include "gears/base/common/stopwatch.h"
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// Returns the current time in milliseconds since the epoch (midnight January 1,
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int64 GetCurrentTimeMillis() {
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return GetTicks() / 1000;
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// Returns a monotonically incrementing counter.
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// gettimeofday() has microsecond resolution, which is good enough, so we use
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// that for simplicity. Note that this isn't strictly monotonic because the
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// clock could be reset.
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int ret = gettimeofday(&t, 0);
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return ret == 0 ? (t.tv_sec * 1000000LL) + t.tv_usec : 0;
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// Returns the number of microseconds elapsed between the start and end tick
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int64 GetTickDeltaMicros(int64 start, int64 end) {
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// Ticks are always microseconds.