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posix_time.c (2977B)

      1 //========================================================================
      2 // GLFW 3.4 POSIX - www.glfw.org
      3 //------------------------------------------------------------------------
      4 // Copyright (c) 2002-2006 Marcus Geelnard
      5 // Copyright (c) 2006-2017 Camilla Löwy <elmindreda@glfw.org>
      6 //
      7 // This software is provided 'as-is', without any express or implied
      8 // warranty. In no event will the authors be held liable for any damages
      9 // arising from the use of this software.
     10 //
     11 // Permission is granted to anyone to use this software for any purpose,
     12 // including commercial applications, and to alter it and redistribute it
     13 // freely, subject to the following restrictions:
     14 //
     15 // 1. The origin of this software must not be misrepresented; you must not
     16 //    claim that you wrote the original software. If you use this software
     17 //    in a product, an acknowledgment in the product documentation would
     18 //    be appreciated but is not required.
     19 //
     20 // 2. Altered source versions must be plainly marked as such, and must not
     21 //    be misrepresented as being the original software.
     22 //
     23 // 3. This notice may not be removed or altered from any source
     24 //    distribution.
     25 //
     26 //========================================================================
     27 // It is fine to use C99 in this file because it will not be built with VS
     28 //========================================================================
     29 
     30 // #define _POSIX_C_SOURCE 199309L
     31 
     32 #include "internal.h"
     33 
     34 #include <unistd.h>
     35 #include <sys/time.h>
     36 #include <time.h>
     37 
     38 
     39 //////////////////////////////////////////////////////////////////////////
     40 //////                       GLFW internal API                      //////
     41 //////////////////////////////////////////////////////////////////////////
     42 
     43 // Initialise timer
     44 //
     45 void _glfwInitTimerPOSIX(void)
     46 {
     47 #if defined(_POSIX_TIMERS) && defined(_POSIX_MONOTONIC_CLOCK)
     48     struct timespec ts;
     49 
     50     if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0)
     51     {
     52         _glfw.timer.posix.monotonic = GLFW_TRUE;
     53         _glfw.timer.posix.frequency = 1000000000;
     54     }
     55     else
     56 #endif
     57     {
     58         _glfw.timer.posix.monotonic = GLFW_FALSE;
     59         _glfw.timer.posix.frequency = 1000000;
     60     }
     61 }
     62 
     63 
     64 //////////////////////////////////////////////////////////////////////////
     65 //////                       GLFW platform API                      //////
     66 //////////////////////////////////////////////////////////////////////////
     67 
     68 uint64_t _glfwPlatformGetTimerValue(void)
     69 {
     70 #if defined(_POSIX_TIMERS) && defined(_POSIX_MONOTONIC_CLOCK)
     71     if (_glfw.timer.posix.monotonic)
     72     {
     73         struct timespec ts;
     74         clock_gettime(CLOCK_MONOTONIC, &ts);
     75         return (uint64_t) ts.tv_sec * (uint64_t) 1000000000 + (uint64_t) ts.tv_nsec;
     76     }
     77     else
     78 #endif
     79     {
     80         struct timeval tv;
     81         gettimeofday(&tv, NULL);
     82         return (uint64_t) tv.tv_sec * (uint64_t) 1000000 + (uint64_t) tv.tv_usec;
     83     }
     84 }
     85 
     86 uint64_t _glfwPlatformGetTimerFrequency(void)
     87 {
     88     return _glfw.timer.posix.frequency;
     89 }
     90