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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// High resolution timer unit tests.
#include "base/basictypes.h"
#include "chrome/browser/sync/util/highres_timer.h"
#include "testing/gtest/include/gtest/gtest.h"
// These unittests have proven to be flaky on buildbot. While we don't want
// them breaking the build, we still build them to guard against bitrot.
// On dev machines during local builds we can enable them.
TEST(HighresTimer, DISABLED_MillisecondClock) {
HighresTimer timer;
// Note: this could fail if we context switch between initializing the timer
// and here. Very unlikely however.
EXPECT_EQ(0, timer.GetElapsedMs());
timer.Start();
uint64 half_ms = HighresTimer::GetTimerFrequency() / 2000;
// Busy wait for half a millisecond.
while (timer.start_ticks() + half_ms > HighresTimer::GetCurrentTicks()) {
// Nothing
}
EXPECT_EQ(1, timer.GetElapsedMs());
}
TEST(HighresTimer, DISABLED_SecondClock) {
HighresTimer timer;
EXPECT_EQ(0, timer.GetElapsedSec());
#ifdef OS_WINDOWS
::Sleep(250);
#else
struct timespec ts1 = {0, 250000000};
nanosleep(&ts1, 0);
#endif
EXPECT_EQ(0, timer.GetElapsedSec());
EXPECT_LE(230, timer.GetElapsedMs());
EXPECT_GE(270, timer.GetElapsedMs());
#ifdef OS_WINDOWS
::Sleep(251);
#else
struct timespec ts2 = {0, 251000000};
nanosleep(&ts2, 0);
#endif
EXPECT_EQ(1, timer.GetElapsedSec());
}
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