00001 /* 00002 * This file is part of libc_utils. 00003 * 00004 * libc_utils is free software; you can redistribute it and/or modify 00005 * it under the terms of the GNU General Public License as published by 00006 * the Free Software Foundation; either version 2 of the License, or 00007 * (at your option) any later version. 00008 * 00009 * libc_utils is distributed in the hope that it will be useful, 00010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 * GNU General Public License for more details. 00013 * 00014 * You should have received a copy of the GNU General Public License 00015 * along with libc_utils; if not, write to the Free Software 00016 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00017 */ 00018 00019 /* 00020 * libc_utils is being developed at the Max-Planck-Institut fuer Astrophysik 00021 * and financially supported by the Deutsches Zentrum fuer Luft- und Raumfahrt 00022 * (DLR). 00023 */ 00024 00025 /*! \file walltime_c.h 00026 * Functionality for reading wall clock time 00027 * 00028 * Copyright (C) 2010 Max-Planck-Society 00029 * \author Martin Reinecke 00030 */ 00031 00032 #ifndef PLANCK_WALLTIME_C_H 00033 #define PLANCK_WALLTIME_C_H 00034 00035 #ifdef __cplusplus 00036 extern "C" { 00037 #endif 00038 00039 /*! Returns an approximation of the current wall time (in seconds). 00040 The first available of the following timers will be used: 00041 <ul> 00042 <li> \a omp_get_wtime(), if OpenMP is available 00043 <li> \a MPI_Wtime(), if MPI is available 00044 <li> \a gettimeofday() otherwise 00045 </ul> 00046 \note Only useful for measuring time differences. 00047 \note This function has an execution time between 10 and 100 nanoseconds. */ 00048 double wallTime(void); 00049 00050 #ifdef __cplusplus 00051 } 00052 #endif 00053 00054 #endif