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annotate liboctave/util/oct-mutex.cc @ 27919:1891570abac8

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update Octave Project Developers copyright for the new year In files that have the "Octave Project Developers" copyright notice, update for 2020.
author John W. Eaton <jwe@octave.org>
date Mon, 06 Jan 2020 22:29:51 -0500
parents b442ec6dda5c
children bd51beb6205e
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1 /*
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2
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3 Copyright (C) 2008-2020 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 distribution
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6 or <https://octave.org/COPYRIGHT.html/>.
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7
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8
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9 This file is part of Octave.
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10
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11 Octave is free software: you can redistribute it and/or modify it
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12 under the terms of the GNU General Public License as published by
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13 the Free Software Foundation, either version 3 of the License, or
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14 (at your option) any later version.
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15
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16 Octave is distributed in the hope that it will be useful, but
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17 WITHOUT ANY WARRANTY; without even the implied warranty of
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18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 GNU General Public License for more details.
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20
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21 You should have received a copy of the GNU General Public License
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22 along with Octave; see the file COPYING. If not, see
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23 <https://www.gnu.org/licenses/>.
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24
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25 */
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26
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27 #if defined (HAVE_CONFIG_H)
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28 # include "config.h"
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29 #endif
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30
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31 #include "oct-mutex.h"
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32 #include "lo-error.h"
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33
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34 #if defined (OCTAVE_USE_WINDOWS_API)
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35 # include <windows.h>
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36 #elif defined (HAVE_PTHREAD_H)
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37 # include <pthread.h>
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38 #endif
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39
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40 namespace octave
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41 {
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42 void
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43 base_mutex::lock (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 void
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49 base_mutex::unlock (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
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54 bool
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55 base_mutex::try_lock (void)
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56 {
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57 (*current_liboctave_error_handler) ("mutex not supported on this platform");
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58
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59 return false;
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60 }
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61
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62 #if defined (OCTAVE_USE_WINDOWS_API)
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63
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64 class
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65 w32_mutex : public base_mutex
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66 {
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67 public:
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68 w32_mutex (void)
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69 : base_mutex ()
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70 {
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71 InitializeCriticalSection (&cs);
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72 }
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73
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74 ~w32_mutex (void)
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75 {
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76 DeleteCriticalSection (&cs);
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77 }
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78
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79 void lock (void)
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80 {
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81 EnterCriticalSection (&cs);
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82 }
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83
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84 void unlock (void)
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85 {
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86 LeaveCriticalSection (&cs);
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87 }
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88
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89 bool try_lock (void)
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90 {
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91 return (TryEnterCriticalSection (&cs) != 0);
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92 }
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93
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94 private:
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95 CRITICAL_SECTION cs;
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96 };
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97
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98 static DWORD thread_id = 0;
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99
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100 void
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101 thread::init (void)
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102 {
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103 thread_id = GetCurrentThreadId ();
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104 }
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105
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106 bool
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107 thread::is_thread (void)
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108 {
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109 return (GetCurrentThreadId () == thread_id);
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110 }
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111
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112 #elif defined (HAVE_PTHREAD_H)
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113
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114 class
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115 pthread_mutex : public base_mutex
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116 {
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117 public:
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118 pthread_mutex (void)
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119 : base_mutex (), m_pm ()
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120 {
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121 pthread_mutexattr_t attr;
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122
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123 pthread_mutexattr_init (&attr);
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124 pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
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125 pthread_mutex_init (&m_pm, &attr);
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126 pthread_mutexattr_destroy (&attr);
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127 }
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128
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129 ~pthread_mutex (void)
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130 {
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131 pthread_mutex_destroy (&m_pm);
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132 }
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133
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134 void lock (void)
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135 {
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136 pthread_mutex_lock (&m_pm);
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137 }
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138
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139 void unlock (void)
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140 {
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141 pthread_mutex_unlock (&m_pm);
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142 }
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143
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144 bool try_lock (void)
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145 {
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146 return (pthread_mutex_trylock (&m_pm) == 0);
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147 }
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148
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149 private:
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150 pthread_mutex_t m_pm;
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151 };
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152
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153 static pthread_t thread_id = 0;
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154
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155 void
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156 thread::init (void)
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157 {
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158 thread_id = pthread_self ();
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159 }
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160
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161 bool
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162 thread::is_thread (void)
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163 {
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164 return (pthread_equal (thread_id, pthread_self ()) != 0);
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165 }
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166
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167 #endif
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168
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169 static base_mutex *
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170 init_rep (void)
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171 {
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172 #if defined (OCTAVE_USE_WINDOWS_API)
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173 return new w32_mutex ();
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174 #elif defined (HAVE_PTHREAD_H)
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175 return new pthread_mutex ();
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176 #else
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177 return new base_mutex ();
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178 #endif
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179 }
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180
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181 mutex::mutex (void) : m_rep (init_rep ()) { }
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182 }