1 /* Copyright (C) 2005 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 Lesser General Public License as published by 8 the Free Software Foundation; either version 2.1 of the License, or 9 (at your option) 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 Lesser General Public License for 14 more details. 15 16 You should have received a copy of the GNU Lesser General Public License 17 along with libgomp; see the file COPYING.LIB. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21 /* As a special exception, if you link this library with other files, some 22 of which are compiled with GCC, to produce an executable, this library 23 does not by itself cause the resulting executable to be covered by the 24 GNU General Public License. This exception does not however invalidate 25 any other reasons why the executable file might be covered by the GNU 26 General Public License. */ 27 28 /* This file contains system specific timer routines. It is expected that 29 a system may well want to write special versions of each of these. 30 31 The following implementation uses the most simple POSIX routines. 32 If present, POSIX 4 clocks should be used instead. */ 33 34 #include "libgomp.h" 35 #include <unistd.h> 36 #if TIME_WITH_SYS_TIME 37 # include <sys/time.h> 38 # include <time.h> 39 #else 40 # if HAVE_SYS_TIME_H 41 # include <sys/time.h> 42 # else 43 # include <time.h> 44 # endif 45 #endif 46 47 48 double 49 omp_get_wtime (void) 50 { 51 #ifdef HAVE_CLOCK_GETTIME 52 struct timespec ts; 53 # ifdef CLOCK_MONOTONIC 54 if (clock_gettime (CLOCK_MONOTONIC, &ts) < 0) 55 # endif 56 clock_gettime (CLOCK_REALTIME, &ts); 57 return ts.tv_sec + ts.tv_nsec / 1e9; 58 #else 59 struct timeval tv; 60 gettimeofday (&tv, NULL); 61 return tv.tv_sec + tv.tv_usec / 1e6; 62 #endif 63 } 64 65 double 66 omp_get_wtick (void) 67 { 68 #ifdef HAVE_CLOCK_GETTIME 69 struct timespec ts; 70 # ifdef CLOCK_MONOTONIC 71 if (clock_getres (CLOCK_MONOTONIC, &ts) < 0) 72 # endif 73 clock_getres (CLOCK_REALTIME, &ts); 74 return ts.tv_sec + ts.tv_nsec / 1e9; 75 #else 76 return 1.0 / sysconf(_SC_CLK_TCK); 77 #endif 78 } 79 80 ialias (omp_get_wtime) 81 ialias (omp_get_wtick) 82