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annotate libinterp/corefcn/nproc.cc @ 31173:0abc9779f751

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Tiff: modified readRGBAImage to use the orientation tag correctly * __tiff__.cc (F__tiff_read_rgba_image__): modified the way the image is read to use the orientation tag in the correct way.
author magedrifaat <magedrifaat@gmail.com>
date Tue, 16 Aug 2022 16:10:10 +0200
parents 32d2b6604a9f
children
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 2012-2022 The Octave Project Developers
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4 //
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5 // See the file COPYRIGHT.md in the top-level directory of this
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6 // distribution or <https://octave.org/copyright/>.
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7 //
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8 // This file is part of Octave.
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9 //
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10 // Octave is free software: you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by
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12 // the Free Software Foundation, either version 3 of the License, or
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13 // (at your option) any later version.
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14 //
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15 // Octave is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 // GNU General Public License for more details.
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19 //
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20 // You should have received a copy of the GNU General Public License
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21 // along with Octave; see the file COPYING. If not, see
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22 // <https://www.gnu.org/licenses/>.
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23 //
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24 ////////////////////////////////////////////////////////////////////////
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25
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26 #if defined (HAVE_CONFIG_H)
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27 # include "config.h"
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28 #endif
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29
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30 #include "nproc-wrapper.h"
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31
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32 #include "defun.h"
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33 #include "error.h"
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34
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35 OCTAVE_NAMESPACE_BEGIN
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36
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37 DEFUN (nproc, args, ,
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38 doc: /* -*- texinfo -*-
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39 @deftypefn {} {@var{n} =} nproc ()
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40 @deftypefnx {} {@var{n} =} nproc (@var{query})
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41 Return the current number of available processors.
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42
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43 If called with the optional argument @var{query}, modify how processors
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44 are counted as follows:
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45
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46 @table @code
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47 @item all
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48 total number of processors.
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49
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50 @item current
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51 processors available to the current process.
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52
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53 @item overridable
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54 same as @code{current}, but overridable through the
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55 @w{@env{OMP_NUM_THREADS}} environment variable.
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56 @end table
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57 @end deftypefn */)
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58 {
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59 int nargin = args.length ();
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60
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61 if (nargin > 1)
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62 print_usage ();
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63
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64 octave_nproc_query query = OCTAVE_NPROC_CURRENT_OVERRIDABLE;
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65
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66 if (nargin == 1)
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67 {
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68 std::string arg = args(0).string_value ();
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69
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70 std::transform (arg.begin (), arg.end (), arg.begin (), tolower);
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71
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72 if (arg == "all")
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73 query = OCTAVE_NPROC_ALL;
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74 else if (arg == "current")
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75 query = OCTAVE_NPROC_CURRENT;
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76 else if (arg == "overridable")
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77 query = OCTAVE_NPROC_CURRENT_OVERRIDABLE;
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78 else
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79 error ("nproc: invalid value for QUERY");
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80 }
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81
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82 return ovl (octave_num_processors_wrapper (query));
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83 }
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84
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85 /*
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86 ## Must always report at least 1 cpu available
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87 %!assert (nproc () >= 1)
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88 %!assert (nproc ("all") >= 1)
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89 %!assert (nproc ("current") >= 1)
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90
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91 ## Test that "overridable" is the default
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92 %!assert (nproc ("overridable"), nproc ())
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93
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94 %!test
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95 %! c = nproc ("current");
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96 %! unwind_protect
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97 %! old_val = getenv ("OMP_NUM_THREADS");
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98 %! new_val = c + 1;
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99 %! setenv ("OMP_NUM_THREADS", num2str (new_val));
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100 %! assert (nproc ("overridable"), new_val);
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101 %! unwind_protect_cleanup
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102 %! if (! isempty (old_val))
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103 %! setenv ("OMP_NUM_THREADS", old_val);
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104 %! else
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105 %! unsetenv ("OMP_NUM_THREADS");
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106 %! endif
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107 %! end_unwind_protect
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108
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109 %!error nproc ("no_valid_option")
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110 */
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111
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112 OCTAVE_NAMESPACE_END