annotate liboctave/util/oct-mutex.h @ 22865:89756f2f085b

use c++11 style for deleting default copy constructor and assignment operator * octave-gui.h, resource-manager.h, shortcut-manager.h, base-text-renderer.h, c-file-ptr-stream.h, dynamic-ld.cc, dynamic-ld.h, event-queue.h, ft-text-renderer.cc, gl-render.cc, gl-render.h, graphics.cc, graphics.in.h, interpreter.h, mex.cc, mxarray.in.h, oct-fstrm.h, oct-iostrm.h, oct-prcstrm.h, oct-procbuf.h, oct-stdstrm.h, oct-stream.cc, oct-stream.h, oct-strstrm.h, octave-link.h, pager.h, profiler.h, sighandlers.cc, symtab.h, text-renderer.h, zfstream.h, __init_fltk__.cc, ov-builtin.h, ov-dld-fcn.h, ov-fcn.h, ov-mex-fcn.h, ov-typeinfo.h, ov-usr-fcn.h, octave.h, lex.h, parse.h, pt-arg-list.h, pt-array-list.h, pt-assign.h, pt-binop.h, pt-bp.h, pt-cbinop.h, pt-cell.h, pt-check.h, pt-classdef.h, pt-cmd.h, pt-colon.h, pt-const.h, pt-decl.h, pt-eval.h, pt-except.h, pt-exp.h, pt-fcn-handle.h, pt-funcall.h, pt-id.h, pt-idx.h, pt-jump.h, pt-loop.h, pt-mat.h, pt-misc.h, pt-pr-code.h, pt-select.h, pt-stmt.h, pt-unop.h, pt-walk.h, pt.h, token.h, Array.cc, idx-vector.h, oct-fftw.h, sparse-chol.cc, sparse-qr.cc, file-ops.h, mach-info.h, oct-env.h, action-container.h, cmd-edit.cc, cmd-edit.h, cmd-hist.h, oct-locbuf.h, oct-mutex.h, oct-shlib.cc, oct-sort.h, pathsearch.h, singleton-cleanup.h, unwind-prot.h, url-transfer.cc, url-transfer.h: Use C++11 style "= delete" declaration to declare copy constructors and assignment operators for classes that should not be copied.
author John W. Eaton <jwe@octave.org>
date Mon, 05 Dec 2016 22:59:37 -0500
parents 3a2b891d0b33
children 87e3163f6c87
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1 /*
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2
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3 Copyright (C) 2008-2016 Michael Goffioul
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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
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9 the Free Software Foundation; either version 3 of the License, or
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10 (at your 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
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13 WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License 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 (octave_oct_mutex_h)
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24 #define octave_oct_mutex_h 1
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25
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26 #include "octave-config.h"
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27
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28 #include "oct-refcount.h"
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29
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30 class octave_mutex;
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31
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32 class
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33 octave_base_mutex
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34 {
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35 public:
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36 friend class octave_mutex;
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37
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38 octave_base_mutex (void) : count (1) { }
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39
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40 virtual ~octave_base_mutex (void) { }
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41
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42 virtual void lock (void);
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43
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44 virtual void unlock (void);
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45
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46 virtual bool try_lock (void);
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47
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48 private:
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49 octave_refcount<int> count;
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50 };
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51
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52 class
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53 OCTAVE_API
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54 octave_mutex
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55 {
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56 public:
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57 octave_mutex (void);
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58
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59 octave_mutex (const octave_mutex& m)
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60 : rep (m.rep)
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61 {
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62 rep->count++;
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63 }
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64
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65 ~octave_mutex (void)
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66 {
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67 if (--rep->count == 0)
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68 delete rep;
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69 }
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70
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71 octave_mutex& operator = (const octave_mutex& m)
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72 {
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73 if (rep != m.rep)
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74 {
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75 if (--rep->count == 0)
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76 delete rep;
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77
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78 rep = m.rep;
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79 rep->count++;
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80 }
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81
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82 return *this;
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83 }
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84
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85 void lock (void)
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86 {
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87 rep->lock ();
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88 }
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89
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90 void unlock (void)
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91 {
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92 rep->unlock ();
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93 }
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94
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95 bool try_lock (void)
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96 {
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97 return rep->try_lock ();
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98 }
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99
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100 protected:
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101 octave_base_mutex *rep;
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102 };
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103
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104 class
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105 octave_autolock
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106 {
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107 public:
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108 octave_autolock (const octave_mutex& m, bool block = true)
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109 : mutex (m), lock_result (false)
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110 {
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111 if (block)
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112 {
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113 mutex.lock ();
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114 lock_result = true;
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115 }
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116 else
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117 lock_result = mutex.try_lock ();
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118 }
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119
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120 ~octave_autolock (void)
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121 {
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122 if (lock_result)
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123 mutex.unlock ();
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124 }
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125
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126 bool ok (void) const { return lock_result; }
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127
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128 operator bool (void) const { return ok (); }
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129
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130 private:
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131
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132 // No copying.
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133
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134 octave_autolock (const octave_autolock&) = delete;
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135
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136 octave_autolock& operator = (const octave_autolock&) = delete;
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137
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138 private:
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139 octave_mutex mutex;
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140 bool lock_result;
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141 };
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142
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143 class
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144 OCTAVE_API
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145 octave_thread
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146 {
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147 public:
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148 static void init (void);
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149
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150 static bool is_octave_thread (void);
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151 };
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152
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153 #endif
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154