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34 lines
1.1 KiB
C++
34 lines
1.1 KiB
C++
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/quic/chromium/quic_clock_skew_detector.h"
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#include "base/metrics/histogram_macros.h"
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namespace net {
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QuicClockSkewDetector::QuicClockSkewDetector(base::TimeTicks ticks_time,
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base::Time wall_time)
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: last_ticks_time_(ticks_time), last_wall_time_(wall_time) {}
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bool QuicClockSkewDetector::ClockSkewDetected(base::TimeTicks ticks_now,
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base::Time wall_now) {
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base::TimeDelta ticks_delta = ticks_now - last_ticks_time_;
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base::TimeDelta wall_delta = wall_now - last_wall_time_;
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base::TimeDelta offset = wall_delta - ticks_delta;
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last_wall_time_ = wall_now;
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last_ticks_time_ = ticks_now;
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UMA_HISTOGRAM_TIMES(
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"Net.QuicClock.SkewOffset",
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base::TimeDelta::FromMicroseconds(offset.InMicroseconds()));
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if (offset < base::TimeDelta::FromSeconds(1))
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return false;
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return true;
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}
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} // namespace net
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