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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include <windows.h> | 5 #include <windows.h> |
6 #include <mmsystem.h> | 6 #include <mmsystem.h> |
7 #include <process.h> | 7 #include <process.h> |
8 | 8 |
9 #include "base/threading/platform_thread.h" | 9 #include "base/threading/platform_thread.h" |
10 #include "base/time.h" | 10 #include "base/time.h" |
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213 | 213 |
214 for (int i = 0; i < kIterations; ++i) { | 214 for (int i = 0; i < kIterations; ++i) { |
215 int64 drift_microseconds = TimeTicks::GetQPCDriftMicroseconds(); | 215 int64 drift_microseconds = TimeTicks::GetQPCDriftMicroseconds(); |
216 | 216 |
217 // Make sure the drift never exceeds our limit. | 217 // Make sure the drift never exceeds our limit. |
218 EXPECT_LT(drift_microseconds, 50000); | 218 EXPECT_LT(drift_microseconds, 50000); |
219 | 219 |
220 // Sleep for a few milliseconds (note that it means 1000 microseconds). | 220 // Sleep for a few milliseconds (note that it means 1000 microseconds). |
221 // If we check the drift too frequently, it's going to increase | 221 // If we check the drift too frequently, it's going to increase |
222 // monotonically, making our measurement less realistic. | 222 // monotonically, making our measurement less realistic. |
223 base::PlatformThread::Sleep((i % 2 == 0) ? 1 : 2); | 223 base::PlatformThread::Sleep( |
| 224 base::TimeDelta::FromMilliseconds((i % 2 == 0) ? 1 : 2)); |
224 | 225 |
225 total_drift += drift_microseconds; | 226 total_drift += drift_microseconds; |
226 } | 227 } |
227 | 228 |
228 // Sanity check. We expect some time drift to occur, especially across | 229 // Sanity check. We expect some time drift to occur, especially across |
229 // the number of iterations we do. However, if the QPC is disabled, this | 230 // the number of iterations we do. However, if the QPC is disabled, this |
230 // is not measuring anything (drift is zero in that case). | 231 // is not measuring anything (drift is zero in that case). |
231 EXPECT_LT(0, total_drift); | 232 EXPECT_LT(0, total_drift); |
232 | 233 |
233 printf("average time drift in microseconds: %lld\n", | 234 printf("average time drift in microseconds: %lld\n", |
234 total_drift / kIterations); | 235 total_drift / kIterations); |
235 } | 236 } |
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