1 /* Copyright (C) 2005-2018 Free Software Foundation, Inc. 2 Contributed by Richard Henderson <rth@redhat.com>. 3 4 This file is part of the GNU Offloading and Multi Processing Library 5 (libgomp). 6 7 Libgomp is free software; you can redistribute it and/or modify it 8 under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 14 FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 more details. 16 17 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26 /* This file contains system specific timer routines. It is expected that 27 a system may well want to write special versions of each of these. 28 29 The following implementation uses the most simple POSIX routines. 30 If present, POSIX 4 clocks should be used instead. */ 31 32 #include "libgomp.h" 33 #include <unistd.h> 34 #if TIME_WITH_SYS_TIME 35 # include <sys/time.h> 36 # include <time.h> 37 #else 38 # if HAVE_SYS_TIME_H 39 # include <sys/time.h> 40 # else 41 # include <time.h> 42 # endif 43 #endif 44 45 46 double 47 omp_get_wtime (void) 48 { 49 #ifdef HAVE_CLOCK_GETTIME 50 struct timespec ts; 51 # ifdef CLOCK_MONOTONIC 52 if (clock_gettime (CLOCK_MONOTONIC, &ts) < 0) 53 # endif 54 clock_gettime (CLOCK_REALTIME, &ts); 55 return ts.tv_sec + ts.tv_nsec / 1e9; 56 #else 57 struct timeval tv; 58 gettimeofday (&tv, NULL); 59 return tv.tv_sec + tv.tv_usec / 1e6; 60 #endif 61 } 62 63 double 64 omp_get_wtick (void) 65 { 66 #ifdef HAVE_CLOCK_GETTIME 67 struct timespec ts; 68 # ifdef CLOCK_MONOTONIC 69 if (clock_getres (CLOCK_MONOTONIC, &ts) < 0) 70 # endif 71 clock_getres (CLOCK_REALTIME, &ts); 72 return ts.tv_sec + ts.tv_nsec / 1e9; 73 #else 74 return 1.0 / sysconf(_SC_CLK_TCK); 75 #endif 76 } 77 78 ialias (omp_get_wtime) 79 ialias (omp_get_wtick) 80