115 lines
3.9 KiB
C
115 lines
3.9 KiB
C
//========================================================================
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// GLFW - An OpenGL framework
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// File: macosx_time.c
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// Platform: Mac OS X
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// API Version: 2.6
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// WWW: http://glfw.sourceforge.net
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//------------------------------------------------------------------------
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// Copyright (c) 2002-2006 Camilla Berglund
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//------------------------------------------------------------------------
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// $Id: macosx_time.c,v 1.7 2007/03/15 03:20:20 elmindreda Exp $
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//========================================================================
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#include "internal.h"
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//************************************************************************
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//**** Platform implementation functions ****
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//************************************************************************
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//========================================================================
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// Return timer value in seconds
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//========================================================================
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double _glfwPlatformGetTime( void )
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{
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struct timeval tv;
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gettimeofday( &tv, NULL );
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return tv.tv_sec + (double) tv.tv_usec / 1000000.0 - _glfwLibrary.Timer.t0;
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}
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//========================================================================
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// Set timer value in seconds
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//========================================================================
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void _glfwPlatformSetTime( double time )
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{
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struct timeval tv;
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gettimeofday( &tv, NULL );
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_glfwLibrary.Timer.t0 = tv.tv_sec + (double) tv.tv_usec / 1000000.0 - time;
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}
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//========================================================================
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// Put a thread to sleep for a specified amount of time
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//========================================================================
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void _glfwPlatformSleep( double time )
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{
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if( time == 0.0 )
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{
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sched_yield();
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return;
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}
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struct timeval currenttime;
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struct timespec wait;
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pthread_mutex_t mutex;
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pthread_cond_t cond;
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long dt_sec, dt_usec;
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// Not all pthread implementations have a pthread_sleep() function. We
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// do it the portable way, using a timed wait for a condition that we
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// will never signal. NOTE: The unistd functions sleep/usleep suspends
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// the entire PROCESS, not a signle thread, which is why we can not
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// use them to implement glfwSleep.
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// Set timeout time, relatvie to current time
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gettimeofday( ¤ttime, NULL );
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dt_sec = (long) time;
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dt_usec = (long) ((time - (double)dt_sec) * 1000000.0);
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wait.tv_nsec = (currenttime.tv_usec + dt_usec) * 1000L;
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if( wait.tv_nsec > 1000000000L )
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{
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wait.tv_nsec -= 1000000000L;
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dt_sec ++;
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}
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wait.tv_sec = currenttime.tv_sec + dt_sec;
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// Initialize condition and mutex objects
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pthread_mutex_init( &mutex, NULL );
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pthread_cond_init( &cond, NULL );
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// Do a timed wait
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pthread_mutex_lock( &mutex );
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pthread_cond_timedwait( &cond, &mutex, &wait );
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pthread_mutex_unlock( &mutex );
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// Destroy condition and mutex objects
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pthread_mutex_destroy( &mutex );
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pthread_cond_destroy( &cond );
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}
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