posix_time.c (2855B)
1 //======================================================================== 2 // GLFW 3.3 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 #include "internal.h" 31 32 #include <sys/time.h> 33 #include <time.h> 34 35 36 ////////////////////////////////////////////////////////////////////////// 37 ////// GLFW internal API ////// 38 ////////////////////////////////////////////////////////////////////////// 39 40 // Initialise timer 41 // 42 void _glfwInitTimerPOSIX(void) 43 { 44 #if defined(CLOCK_MONOTONIC) 45 struct timespec ts; 46 47 if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) 48 { 49 _glfw.timer.posix.monotonic = GLFW_TRUE; 50 _glfw.timer.posix.frequency = 1000000000; 51 } 52 else 53 #endif 54 { 55 _glfw.timer.posix.monotonic = GLFW_FALSE; 56 _glfw.timer.posix.frequency = 1000000; 57 } 58 } 59 60 61 ////////////////////////////////////////////////////////////////////////// 62 ////// GLFW platform API ////// 63 ////////////////////////////////////////////////////////////////////////// 64 65 uint64_t _glfwPlatformGetTimerValue(void) 66 { 67 #if defined(CLOCK_MONOTONIC) 68 if (_glfw.timer.posix.monotonic) 69 { 70 struct timespec ts; 71 clock_gettime(CLOCK_MONOTONIC, &ts); 72 return (uint64_t) ts.tv_sec * (uint64_t) 1000000000 + (uint64_t) ts.tv_nsec; 73 } 74 else 75 #endif 76 { 77 struct timeval tv; 78 gettimeofday(&tv, NULL); 79 return (uint64_t) tv.tv_sec * (uint64_t) 1000000 + (uint64_t) tv.tv_usec; 80 } 81 } 82 83 uint64_t _glfwPlatformGetTimerFrequency(void) 84 { 85 return _glfw.timer.posix.frequency; 86 } 87