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annotate liboctave/util/oct-locbuf.cc @ 21751:b571fc85953f

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maint: Use two spaces after period to indicate sentence break.
author Rik <rik@octave.org>
date Thu, 19 May 2016 18:48:52 -0700
parents aba2e6293dd8
children bac0d6f07a3e
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1 /*
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2
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3 Copyright (C) 2008-2015 Jaroslav Hajek
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if defined (HAVE_CONFIG_H)
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24 # include "config.h"
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25 #endif
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26
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27 #include <iostream>
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28
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29 #include "lo-error.h"
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30 #include "oct-locbuf.h"
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31
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32 // FIXME: Maybe we should querying for available physical memory?
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33
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34 #if ! defined (OCTAVE_LOCBUF_CHUNKSIZE_MB)
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35 # define OCTAVE_LOCBUF_CHUNKSIZE_MB 32
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36 #endif
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37
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38 // Each chunk will be at least this big.
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39
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40 const size_t octave_chunk_buffer::chunk_size =
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41 static_cast<size_t> (OCTAVE_LOCBUF_CHUNKSIZE_MB) << 20;
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42
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43 char *octave_chunk_buffer::top = 0;
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44 char *octave_chunk_buffer::chunk = 0;
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45 size_t octave_chunk_buffer::left = 0;
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46 size_t octave_chunk_buffer::active = 0;
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47
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48 octave_chunk_buffer::octave_chunk_buffer (size_t size) : cnk (0), dat (0)
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49 {
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50 // Alignment mask. The size of double or long int, whichever is
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51 // greater. All data will be aligned to this size. If it's not
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52 // enough for a type, that type should not be declared as POD.
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53
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54 static const size_t align_mask = (sizeof (long) < sizeof (double)
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55 ? sizeof (double)
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56 : sizeof (long)) - 1;
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57
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58 active++;
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59
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60 if (! size)
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61 return;
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62
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63 // Align size. Note that size_t is unsigned, so size-1 must correctly
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64 // wrap around.
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65
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66 size = ((size - 1) | align_mask) + 1;
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67
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68 if (size > left)
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69 {
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70 // Big buffers (> 1/8 chunk) will be allocated as stand-alone and
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71 // won't disrupt the chain.
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72
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73 if (size > chunk_size >> 3)
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74 {
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75 // Use new [] to get std::bad_alloc if out of memory.
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76
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77 dat = new char [size];
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78 return;
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79 }
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80
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81 dat = new char [chunk_size];
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82 chunk = top = dat;
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83 left = chunk_size;
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84 }
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85
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86 // Now allocate memory from the chunk and update state.
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87
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88 cnk = chunk;
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89 dat = top;
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90 left -= size;
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91 top += size;
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92 }
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93
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94 octave_chunk_buffer::~octave_chunk_buffer (void)
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95 {
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96 active--;
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97
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98 if (cnk == chunk)
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99 {
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100 // Our chunk is still the active one. Just restore the state.
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101
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102 left += top - dat;
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103 top = dat;
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104 }
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105 else
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106 {
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107 if (cnk)
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108 {
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109 // Responsible for deletion.
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110
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111 delete [] chunk;
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112 chunk = cnk;
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113 top = dat;
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114
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115 // FIXME: the following calcuation of remaining data will
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116 // only work if each chunk has the same chunk_size.
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117
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118 left = chunk_size - (dat - cnk);
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119 }
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120 else
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121 {
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122 // We were a stand-alone buffer.
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123
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124 delete [] dat;
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125 }
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126 }
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127 }
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128
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129 // Clear the final chunk of allocated memory.
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130
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131 void
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132 octave_chunk_buffer::clear (void)
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133 {
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134 if (active == 0)
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135 {
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136 delete [] chunk;
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137 chunk = 0;
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138 top = 0;
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139 left = 0;
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140 }
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141 else
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142 {
19410
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143 // FIXME: Doesn't this situation represent a programming error of
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144 // some kind? If so, maybe this should be a fatal error?
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145
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146 (*current_liboctave_warning_with_id_handler)
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147 ("Octave:local-buffer-inconsistency",
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148 "octave_chunk_buffer::clear: %d active allocations remain!",
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149 active);
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150 }
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151 }