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annotate liboctave/util/oct-mutex.cc @ 21979:d04da18a407a

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use OCTAVE_USE_WINDOWS_API more consistently * octave-gui.cc, thread-manager.cc, welcome-wizard.cc, ft-text-renderer.cc, sighandlers.cc, sighandlers.h, sysdep.cc, sysdep.h, toplev.cc, ov-java.cc, lo-sysdep.cc, kpse.cc, oct-mutex.cc, oct-conf-post.in.h, main.in.cc, mkoctfile.in.cc, shared-fcns.h: Prefer OCTAVE_USE_WINDOWS_API where possible.
author John W. Eaton <jwe@octave.org>
date Sun, 26 Jun 2016 03:50:20 -0400
parents aba2e6293dd8
children bac0d6f07a3e
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1 /*
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2
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3 Copyright (C) 2008-2015 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 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 "oct-mutex.h"
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28 #include "lo-error.h"
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29
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30 #if defined (OCTAVE_USE_WINDOWS_API)
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31 # include <windows.h>
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32 #elif defined (HAVE_PTHREAD_H)
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33 # include <pthread.h>
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34 #endif
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35
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36 void
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37 octave_base_mutex::lock (void)
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38 {
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39 (*current_liboctave_error_handler) ("mutex not supported on this platform");
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40 }
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41
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42 void
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43 octave_base_mutex::unlock (void)
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44 {
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45 (*current_liboctave_error_handler) ("mutex not supported on this platform");
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46 }
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47
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48 bool
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49 octave_base_mutex::try_lock (void)
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50 {
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51 (*current_liboctave_error_handler) ("mutex not supported on this platform");
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52
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53 return false;
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54 }
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55
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56 #if defined (OCTAVE_USE_WINDOWS_API)
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57
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58 class
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59 octave_w32_mutex : public octave_base_mutex
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60 {
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61 public:
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62 octave_w32_mutex (void)
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63 : octave_base_mutex ()
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64 {
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65 InitializeCriticalSection (&cs);
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66 }
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67
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68 ~octave_w32_mutex (void)
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69 {
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70 DeleteCriticalSection (&cs);
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71 }
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72
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73 void lock (void)
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74 {
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75 EnterCriticalSection (&cs);
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76 }
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77
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78 void unlock (void)
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79 {
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80 LeaveCriticalSection (&cs);
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81 }
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82
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83 bool try_lock (void)
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84 {
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85 return (TryEnterCriticalSection (&cs) != 0);
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86 }
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87
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88 private:
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89 CRITICAL_SECTION cs;
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90 };
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91
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92 static DWORD octave_thread_id = 0;
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93
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94 void
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95 octave_thread::init (void)
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96 {
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97 octave_thread_id = GetCurrentThreadId ();
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98 }
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99
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100 bool
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101 octave_thread::is_octave_thread (void)
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102 {
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103 return (GetCurrentThreadId () == octave_thread_id);
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104 }
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105
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106 #elif defined (HAVE_PTHREAD_H)
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107
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108 class
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109 octave_pthread_mutex : public octave_base_mutex
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110 {
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111 public:
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112 octave_pthread_mutex (void)
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113 : octave_base_mutex (), pm ()
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114 {
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115 pthread_mutexattr_t attr;
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116
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117 pthread_mutexattr_init (&attr);
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118 pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
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119 pthread_mutex_init (&pm, &attr);
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120 pthread_mutexattr_destroy (&attr);
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121 }
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122
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123 ~octave_pthread_mutex (void)
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124 {
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125 pthread_mutex_destroy (&pm);
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126 }
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127
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128 void lock (void)
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129 {
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130 pthread_mutex_lock (&pm);
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131 }
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132
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133 void unlock (void)
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134 {
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135 pthread_mutex_unlock (&pm);
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136 }
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137
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138 bool try_lock (void)
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139 {
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140 return (pthread_mutex_trylock (&pm) == 0);
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141 }
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142
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143 private:
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144 pthread_mutex_t pm;
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145 };
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146
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147 static pthread_t octave_thread_id = 0;
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148
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149 void
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150 octave_thread::init (void)
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151 {
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152 octave_thread_id = pthread_self ();
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153 }
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154
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155 bool
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156 octave_thread::is_octave_thread (void)
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157 {
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158 return (pthread_equal (octave_thread_id, pthread_self ()) != 0);
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159 }
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160
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161 #endif
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162
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163 static octave_base_mutex *
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164 init_rep (void)
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165 {
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166 #if defined (OCTAVE_USE_WINDOWS_API)
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167 return new octave_w32_mutex ();
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168 #elif defined (HAVE_PTHREAD_H)
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169 return new octave_pthread_mutex ();
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170 #else
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171 return new octave_base_mutex ();
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172 #endif
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173 }
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174
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175 octave_mutex::octave_mutex (void) : rep (init_rep ()) { }