1 /* Copyright (C) 2005, 2009 Free Software Foundation, Inc. 2 Contributed by Richard Henderson <rth@redhat.com>. 3 4 This file is part of the GNU OpenMP Library (libgomp). 5 6 Libgomp is free software; you can redistribute it and/or modify it 7 under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3, or (at your option) 9 any later version. 10 11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 more details. 15 16 Under Section 7 of GPL version 3, you are granted additional 17 permissions described in the GCC Runtime Library Exception, version 18 3.1, as published by the Free Software Foundation. 19 20 You should have received a copy of the GNU General Public License and 21 a copy of the GCC Runtime Library Exception along with this program; 22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 <http://www.gnu.org/licenses/>. */ 24 25 /* This file contains system specific timer routines. It is expected that 26 a system may well want to write special versions of each of these. 27 28 The following implementation uses the most simple POSIX routines. 29 If present, POSIX 4 clocks should be used instead. */ 30 31 #include "libgomp.h" 32 #include <unistd.h> 33 #if TIME_WITH_SYS_TIME 34 # include <sys/time.h> 35 # include <time.h> 36 #else 37 # if HAVE_SYS_TIME_H 38 # include <sys/time.h> 39 # else 40 # include <time.h> 41 # endif 42 #endif 43 44 45 double 46 omp_get_wtime (void) 47 { 48 #ifdef HAVE_CLOCK_GETTIME 49 struct timespec ts; 50 # ifdef CLOCK_MONOTONIC 51 if (clock_gettime (CLOCK_MONOTONIC, &ts) < 0) 52 # endif 53 clock_gettime (CLOCK_REALTIME, &ts); 54 return ts.tv_sec + ts.tv_nsec / 1e9; 55 #else 56 struct timeval tv; 57 gettimeofday (&tv, NULL); 58 return tv.tv_sec + tv.tv_usec / 1e6; 59 #endif 60 } 61 62 double 63 omp_get_wtick (void) 64 { 65 #ifdef HAVE_CLOCK_GETTIME 66 struct timespec ts; 67 # ifdef CLOCK_MONOTONIC 68 if (clock_getres (CLOCK_MONOTONIC, &ts) < 0) 69 # endif 70 clock_getres (CLOCK_REALTIME, &ts); 71 return ts.tv_sec + ts.tv_nsec / 1e9; 72 #else 73 return 1.0 / sysconf(_SC_CLK_TCK); 74 #endif 75 } 76 77 ialias (omp_get_wtime) 78 ialias (omp_get_wtick) 79