ref: b6fe4f175c24d788a5132ea49c2c2596c700c4ac
dir: /external/glfw/src/posix_time.c/
//========================================================================
// GLFW 3.3 POSIX - www.glfw.org
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2017 Camilla Löwy <elmindreda@glfw.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
// It is fine to use C99 in this file because it will not be built with VS
//========================================================================
#include "internal.h"
#include <sys/time.h>
#include <time.h>
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
// Initialise timer
//
void _glfwInitTimerPOSIX(void)
{
#if defined(CLOCK_MONOTONIC)
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0)
{
_glfw.timer.posix.monotonic = GLFW_TRUE;
_glfw.timer.posix.frequency = 1000000000;
}
else
#endif
{
_glfw.timer.posix.monotonic = GLFW_FALSE;
_glfw.timer.posix.frequency = 1000000;
}
}
//////////////////////////////////////////////////////////////////////////
////// GLFW platform API //////
//////////////////////////////////////////////////////////////////////////
uint64_t _glfwPlatformGetTimerValue(void)
{
#if defined(CLOCK_MONOTONIC)
if (_glfw.timer.posix.monotonic)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (uint64_t) ts.tv_sec * (uint64_t) 1000000000 + (uint64_t) ts.tv_nsec;
}
else
#endif
{
struct timeval tv;
gettimeofday(&tv, NULL);
return (uint64_t) tv.tv_sec * (uint64_t) 1000000 + (uint64_t) tv.tv_usec;
}
}
uint64_t _glfwPlatformGetTimerFrequency(void)
{
return _glfw.timer.posix.frequency;
}