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/************************************************************************
*
* Copyright (C) 2009-2024 IRCAD France
* Copyright (C) 2012-2015 IHU Strasbourg
*
* This file is part of Sight.
*
* Sight is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sight is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Sight. If not, see <https://www.gnu.org/licenses/>.
*
***********************************************************************/
#include "core/thread/timer.hpp"
#ifdef _WIN32
// for timeBeginPeriod and timeEndPeriod
#include <Windows.h>
#endif
namespace sight::core::thread
{
#ifdef _WIN32
/**
* @brief Set the Windows timer precision.
*
* This is absolutely needed to have precise std::this_thread::sleep_for (indeed, all "timed" functions), otherwise the
* windows scheduler resolution (1/64 seconds or ~15.62 ms) will be used. This would implicitly limit timers frequency
* to 64 Hz, which can be too low.
*
* @note This is a process wide settings
*
* @see https://learn.microsoft.com/en-us/windows/win32/api/timeapi/nf-timeapi-timebeginperiod
*/
const static struct timer_precision
{
timer_precision()
{
// Set the timer precision to 1 ms on windows for the current process
timeBeginPeriod(1);
}
~timer_precision()
{
// Restore the timer precision. An application must match each call to timeBeginPeriod and timeEndPeriod
// The parameter must match the one used for timeBeginPeriod
timeEndPeriod(1);
}
} timer_precision;
#endif
} //namespace sight::core::thread
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