Initial commit of sync engine code to browser/sync....

chrome/browser/sync/util/highres_timer_unittest.cc

+// 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());
+}