| // |
| // Copyright (c) 2015 The ANGLE 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. |
| // |
| |
| // LinuxTimer.cpp: Implementation of a high precision timer class on Linux |
| |
| #include "util/linux/LinuxTimer.h" |
| #include <iostream> |
| |
| LinuxTimer::LinuxTimer() : mRunning(false) {} |
| |
| namespace |
| { |
| uint64_t getCurrentTimeNs() |
| { |
| struct timespec currentTime; |
| clock_gettime(CLOCK_MONOTONIC, ¤tTime); |
| return currentTime.tv_sec * 1'000'000'000llu + currentTime.tv_nsec; |
| } |
| } // anonymous namespace |
| |
| void LinuxTimer::start() |
| { |
| mStartTimeNs = getCurrentTimeNs(); |
| mRunning = true; |
| } |
| |
| void LinuxTimer::stop() |
| { |
| mStopTimeNs = getCurrentTimeNs(); |
| mRunning = false; |
| } |
| |
| double LinuxTimer::getElapsedTime() const |
| { |
| uint64_t endTimeNs; |
| if (mRunning) |
| { |
| endTimeNs = getCurrentTimeNs(); |
| } |
| else |
| { |
| endTimeNs = mStopTimeNs; |
| } |
| |
| return (endTimeNs - mStartTimeNs) * 1e-9; |
| } |
| |
| double LinuxTimer::getAbsoluteTime() |
| { |
| return getCurrentTimeNs() * 1e-9; |
| } |
| |
| Timer *CreateTimer() |
| { |
| return new LinuxTimer(); |
| } |