diff options
Diffstat (limited to 'chromium/third_party/webrtc/base/timing.h')
-rw-r--r-- | chromium/third_party/webrtc/base/timing.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/chromium/third_party/webrtc/base/timing.h b/chromium/third_party/webrtc/base/timing.h new file mode 100644 index 00000000000..58b17a9fb7e --- /dev/null +++ b/chromium/third_party/webrtc/base/timing.h @@ -0,0 +1,59 @@ +/* + * Copyright 2008 The WebRTC Project Authors. All rights reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#ifndef WEBRTC_BASE_TIMING_H_ +#define WEBRTC_BASE_TIMING_H_ + +#if defined(WEBRTC_WIN) +#include "webrtc/base/win32.h" +#endif + +namespace rtc { + +class Timing { + public: + Timing(); + virtual ~Timing(); + + // WallTimeNow() returns the current wall-clock time in seconds, + // within 10 milliseconds resolution. + virtual double WallTimeNow(); + + // TimerNow() is like WallTimeNow(), but is monotonically + // increasing. It returns seconds in resolution of 10 microseconds + // or better. Although timer and wall-clock time have the same + // timing unit, they do not necessarily correlate because wall-clock + // time may be adjusted backwards, hence not monotonic. + // Made virtual so we can make a fake one. + virtual double TimerNow(); + + // BusyWait() exhausts CPU as long as the time elapsed is less than + // the specified interval in seconds. Returns the actual waiting + // time based on TimerNow() measurement. + double BusyWait(double period); + + // IdleWait() relinquishes control of CPU for specified period in + // seconds. It uses highest resolution sleep mechanism as possible, + // but does not otherwise guarantee the accuracy. Returns the + // actual waiting time based on TimerNow() measurement. + // + // This function is not re-entrant for an object. Create a fresh + // Timing object for each thread. + double IdleWait(double period); + + private: +#if defined(WEBRTC_WIN) + HANDLE timer_handle_; +#endif +}; + +} // namespace rtc + +#endif // WEBRTC_BASE_TIMING_H_ |