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//========================================================================
// GLFW - An OpenGL framework
// File: x11_time.c
// Platform: X11 (Unix)
// API version: 2.6
// WWW: http://glfw.sourceforge.net
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Camilla Berglund
//
// 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.
//
//========================================================================
#include "internal.h"
//========================================================================
// Initialise timer
//========================================================================
void _glfwInitTimer( void )
{
struct timeval tv;
// "Resolution" is 1 us
_glfwLibrary.Timer.Resolution = 1e-6;
// Set start-time for timer
gettimeofday( &tv, NULL );
_glfwLibrary.Timer.t0 = (long long) tv.tv_sec * (long long) 1000000 +
(long long) tv.tv_usec;
}
//************************************************************************
//**** Platform implementation functions ****
//************************************************************************
//========================================================================
// Return timer value in seconds
//========================================================================
double _glfwPlatformGetTime( void )
{
long long t;
struct timeval tv;
gettimeofday( &tv, NULL );
t = (long long) tv.tv_sec * (long long) 1000000 +
(long long) tv.tv_usec;
return (double)(t - _glfwLibrary.Timer.t0) * _glfwLibrary.Timer.Resolution;
}
//========================================================================
// Set timer value in seconds
//========================================================================
void _glfwPlatformSetTime( double t )
{
long long t0;
struct timeval tv;
gettimeofday( &tv, NULL );
t0 = (long long) tv.tv_sec * (long long) 1000000 +
(long long) tv.tv_usec;
// Calulate new starting time
_glfwLibrary.Timer.t0 = t0 - (long long)(t/_glfwLibrary.Timer.Resolution);
}
//========================================================================
// Put a thread to sleep for a specified amount of time
//========================================================================
void _glfwPlatformSleep( double time )
{
#ifdef _GLFW_HAS_PTHREAD
if( time == 0.0 )
{
#ifdef _GLFW_HAS_SCHED_YIELD
sched_yield();
#endif
return;
}
struct timeval currenttime;
struct timespec wait;
pthread_mutex_t mutex;
pthread_cond_t cond;
long dt_sec, dt_usec;
// Not all pthread implementations have a pthread_sleep() function. We
// do it the portable way, using a timed wait for a condition that we
// will never signal. NOTE: The unistd functions sleep/usleep suspends
// the entire PROCESS, not a signle thread, which is why we can not
// use them to implement glfwSleep.
// Set timeout time, relatvie to current time
gettimeofday( ¤ttime, NULL );
dt_sec = (long) time;
dt_usec = (long) ((time - (double)dt_sec) * 1000000.0);
wait.tv_nsec = (currenttime.tv_usec + dt_usec) * 1000L;
if( wait.tv_nsec > 1000000000L )
{
wait.tv_nsec -= 1000000000L;
dt_sec++;
}
wait.tv_sec = currenttime.tv_sec + dt_sec;
// Initialize condition and mutex objects
pthread_mutex_init( &mutex, NULL );
pthread_cond_init( &cond, NULL );
// Do a timed wait
pthread_mutex_lock( &mutex );
pthread_cond_timedwait( &cond, &mutex, &wait );
pthread_mutex_unlock( &mutex );
// Destroy condition and mutex objects
pthread_mutex_destroy( &mutex );
pthread_cond_destroy( &cond );
#else
// For systems without PTHREAD, use unistd usleep
if( time > 0 )
{
usleep( (unsigned int) (time*1000000) );
}
#endif // _GLFW_HAS_PTHREAD
}
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