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