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<a href="a00110.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> // <mutex> -*- C++ -*-</div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> // Copyright (C) 2003-2018 Free Software Foundation, Inc.</div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> //</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> // This file is part of the GNU ISO C++ Library. This library is free</div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> // software; you can redistribute it and/or modify it under the</div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> // terms of the GNU General Public License as published by the</div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> // Free Software Foundation; either version 3, or (at your option)</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> // any later version.</div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> // This library is distributed in the hope that it will be useful,</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> // but WITHOUT ANY WARRANTY; without even the implied warranty of</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> // GNU General Public License for more details.</div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> // Under Section 7 of GPL version 3, you are granted additional</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> // permissions described in the GCC Runtime Library Exception, version</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> // 3.1, as published by the Free Software Foundation.</div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> // You should have received a copy of the GNU General Public License and</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> // a copy of the GCC Runtime Library Exception along with this program;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> // <http://www.gnu.org/licenses/>.</div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> /** @file include/mutex</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  * This is a Standard C++ Library header.</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  */</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> #ifndef _GLIBCXX_MUTEX</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> #define _GLIBCXX_MUTEX 1</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> #pragma GCC system_header</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> </div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> #if __cplusplus < 201103L</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> # include <bits/c++0x_warning.h></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> #else</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> #include <tuple></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> #include <chrono></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> #include <exception></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> #include <type_traits></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> #include <system_error></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> #include <bits/std_mutex.h></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> #if ! _GTHREAD_USE_MUTEX_TIMEDLOCK</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> # include <condition_variable></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> # include <thread></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> #endif</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> #ifndef _GLIBCXX_HAVE_TLS</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> # include <bits/std_function.h></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> #endif</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> #ifdef _GLIBCXX_USE_C99_STDINT_TR1</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> </div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> namespace std _GLIBCXX_VISIBILITY(default)</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> {</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> </div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  /**</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  * @ingroup mutexes</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  * @{</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  */</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> #ifdef _GLIBCXX_HAS_GTHREADS</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  // Common base class for std::recursive_mutex and std::recursive_timed_mutex</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  class __recursive_mutex_base</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  {</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  protected:</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  typedef __gthread_recursive_mutex_t __native_type;</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  __recursive_mutex_base(const __recursive_mutex_base&) = delete;</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  __recursive_mutex_base& operator=(const __recursive_mutex_base&) = delete;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> #ifdef __GTHREAD_RECURSIVE_MUTEX_INIT</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  __native_type _M_mutex = __GTHREAD_RECURSIVE_MUTEX_INIT;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  __recursive_mutex_base() = default;</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> #else</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  __native_type _M_mutex;</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  __recursive_mutex_base()</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  {</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  // XXX EAGAIN, ENOMEM, EPERM, EBUSY(may), EINVAL(may)</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION(&_M_mutex);</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  }</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  ~__recursive_mutex_base()</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  { __gthread_recursive_mutex_destroy(&_M_mutex); }</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> #endif</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  };</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  /// The standard recursive mutex type.</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  class recursive_mutex : private __recursive_mutex_base</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  {</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  public:</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  typedef __native_type* native_handle_type;</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  recursive_mutex() = default;</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  ~recursive_mutex() = default;</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  recursive_mutex(const recursive_mutex&) = delete;</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  recursive_mutex& operator=(const recursive_mutex&) = delete;</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  void</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  lock()</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  {</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  int __e = __gthread_recursive_mutex_lock(&_M_mutex);</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> </div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  // EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  if (__e)</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  __throw_system_error(__e);</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  }</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> </div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  bool</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  try_lock() noexcept</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  {</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  // XXX EINVAL, EAGAIN, EBUSY</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  return !__gthread_recursive_mutex_trylock(&_M_mutex);</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  }</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> </div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  void</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  unlock()</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  {</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  // XXX EINVAL, EAGAIN, EBUSY</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  __gthread_recursive_mutex_unlock(&_M_mutex);</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  }</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  native_handle_type</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  native_handle() noexcept</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  { return &_M_mutex; }</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  };</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> #if _GTHREAD_USE_MUTEX_TIMEDLOCK</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  template<typename _Derived></div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  class __timed_mutex_impl</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  {</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  protected:</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  typedef chrono::high_resolution_clock __clock_t;</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> </div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  template<typename _Rep, typename _Period></div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  bool</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  _M_try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  {</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  using chrono::steady_clock;</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  auto __rt = chrono::duration_cast<steady_clock::duration>(__rtime);</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  if (ratio_greater<steady_clock::period, _Period>())</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  ++__rt;</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  return _M_try_lock_until(steady_clock::now() + __rt);</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  }</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span> </div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  template<typename _Duration></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  bool</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  _M_try_lock_until(const chrono::time_point<__clock_t,</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  _Duration>& __atime)</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  {</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  auto __s = chrono::time_point_cast<chrono::seconds>(__atime);</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  auto __ns = chrono::duration_cast<chrono::nanoseconds>(__atime - __s);</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span> </div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  __gthread_time_t __ts = {</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  static_cast<std::time_t>(__s.time_since_epoch().count()),</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  static_cast<long>(__ns.count())</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  };</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  return static_cast<_Derived*>(this)->_M_timedlock(__ts);</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  }</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span> </div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  template<typename _Clock, typename _Duration></div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  bool</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  _M_try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  {</div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  auto __rtime = __atime - _Clock::now();</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  return _M_try_lock_until(__clock_t::now() + __rtime);</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  }</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  };</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  /// The standard timed mutex type.</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  class timed_mutex</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  : private __mutex_base, public __timed_mutex_impl<timed_mutex></div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  {</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  public:</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  typedef __native_type* native_handle_type;</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span> </div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  timed_mutex() = default;</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  ~timed_mutex() = default;</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span> </div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  timed_mutex(const timed_mutex&) = delete;</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  timed_mutex& operator=(const timed_mutex&) = delete;</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span> </div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  void</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  lock()</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  {</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  int __e = __gthread_mutex_lock(&_M_mutex);</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span> </div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  // EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  if (__e)</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  __throw_system_error(__e);</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  }</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span> </div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  bool</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  try_lock() noexcept</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  {</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  // XXX EINVAL, EAGAIN, EBUSY</div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  return !__gthread_mutex_trylock(&_M_mutex);</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  }</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  template <class _Rep, class _Period></div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  bool</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  { return _M_try_lock_for(__rtime); }</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span> </div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  template <class _Clock, class _Duration></div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  bool</div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)</div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  { return _M_try_lock_until(__atime); }</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span> </div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  void</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  unlock()</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  {</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  // XXX EINVAL, EAGAIN, EBUSY</div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  __gthread_mutex_unlock(&_M_mutex);</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  }</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span> </div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  native_handle_type</div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  native_handle() noexcept</div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  { return &_M_mutex; }</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span> </div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  private:</div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  friend class __timed_mutex_impl<timed_mutex>;</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span> </div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  bool</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  _M_timedlock(const __gthread_time_t& __ts)</div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  { return !__gthread_mutex_timedlock(&_M_mutex, &__ts); }</div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  };</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span> </div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  /// recursive_timed_mutex</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  class recursive_timed_mutex</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  : private __recursive_mutex_base,</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  public __timed_mutex_impl<recursive_timed_mutex></div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  {</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  public:</div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  typedef __native_type* native_handle_type;</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span> </div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  recursive_timed_mutex() = default;</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  ~recursive_timed_mutex() = default;</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span> </div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  recursive_timed_mutex(const recursive_timed_mutex&) = delete;</div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  recursive_timed_mutex& operator=(const recursive_timed_mutex&) = delete;</div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span> </div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  void</div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  lock()</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  {</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  int __e = __gthread_recursive_mutex_lock(&_M_mutex);</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span> </div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  // EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may)</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  if (__e)</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  __throw_system_error(__e);</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  }</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span> </div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  bool</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  try_lock() noexcept</div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  {</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  // XXX EINVAL, EAGAIN, EBUSY</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  return !__gthread_recursive_mutex_trylock(&_M_mutex);</div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  }</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span> </div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  template <class _Rep, class _Period></div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  bool</div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)</div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  { return _M_try_lock_for(__rtime); }</div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span> </div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  template <class _Clock, class _Duration></div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  bool</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)</div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  { return _M_try_lock_until(__atime); }</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span> </div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  void</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  unlock()</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  {</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  // XXX EINVAL, EAGAIN, EBUSY</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  __gthread_recursive_mutex_unlock(&_M_mutex);</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  }</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span> </div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  native_handle_type</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  native_handle() noexcept</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  { return &_M_mutex; }</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span> </div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  private:</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  friend class __timed_mutex_impl<recursive_timed_mutex>;</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span> </div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  bool</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  _M_timedlock(const __gthread_time_t& __ts)</div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  { return !__gthread_recursive_mutex_timedlock(&_M_mutex, &__ts); }</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  };</div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span> </div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span> #else // !_GTHREAD_USE_MUTEX_TIMEDLOCK</div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span> </div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  /// timed_mutex</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  class timed_mutex</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  {</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  mutex _M_mut;</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  condition_variable _M_cv;</div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  bool _M_locked = false;</div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span> </div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  public:</div><div class="line"><a name="l00305"></a><span class="lineno"> 305</span> </div><div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  timed_mutex() = default;</div><div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  ~timed_mutex() { __glibcxx_assert( !_M_locked ); }</div><div class="line"><a name="l00308"></a><span class="lineno"> 308</span> </div><div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  timed_mutex(const timed_mutex&) = delete;</div><div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  timed_mutex& operator=(const timed_mutex&) = delete;</div><div class="line"><a name="l00311"></a><span class="lineno"> 311</span> </div><div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  void</div><div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  lock()</div><div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  {</div><div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  unique_lock<mutex> __lk(_M_mut);</div><div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  _M_cv.wait(__lk, [&]{ return !_M_locked; });</div><div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  _M_locked = true;</div><div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  }</div><div class="line"><a name="l00319"></a><span class="lineno"> 319</span> </div><div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  bool</div><div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  try_lock()</div><div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  {</div><div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  lock_guard<mutex> __lk(_M_mut);</div><div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  if (_M_locked)</div><div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  return false;</div><div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  _M_locked = true;</div><div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  return true;</div><div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  }</div><div class="line"><a name="l00329"></a><span class="lineno"> 329</span> </div><div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  template<typename _Rep, typename _Period></div><div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  bool</div><div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)</div><div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  {</div><div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  unique_lock<mutex> __lk(_M_mut);</div><div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  if (!_M_cv.wait_for(__lk, __rtime, [&]{ return !_M_locked; }))</div><div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  return false;</div><div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  _M_locked = true;</div><div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  return true;</div><div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  }</div><div class="line"><a name="l00340"></a><span class="lineno"> 340</span> </div><div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  template<typename _Clock, typename _Duration></div><div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  bool</div><div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)</div><div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  {</div><div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  unique_lock<mutex> __lk(_M_mut);</div><div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  if (!_M_cv.wait_until(__lk, __atime, [&]{ return !_M_locked; }))</div><div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  return false;</div><div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  _M_locked = true;</div><div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  return true;</div><div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  }</div><div class="line"><a name="l00351"></a><span class="lineno"> 351</span> </div><div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  void</div><div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  unlock()</div><div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  {</div><div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  lock_guard<mutex> __lk(_M_mut);</div><div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  __glibcxx_assert( _M_locked );</div><div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  _M_locked = false;</div><div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  _M_cv.notify_one();</div><div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  }</div><div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  };</div><div class="line"><a name="l00361"></a><span class="lineno"> 361</span> </div><div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  /// recursive_timed_mutex</div><div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  class recursive_timed_mutex</div><div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  {</div><div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  mutex _M_mut;</div><div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  condition_variable _M_cv;</div><div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  thread::id _M_owner;</div><div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  unsigned _M_count = 0;</div><div class="line"><a name="l00369"></a><span class="lineno"> 369</span> </div><div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  // Predicate type that tests whether the current thread can lock a mutex.</div><div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  struct _Can_lock</div><div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  {</div><div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  // Returns true if the mutex is unlocked or is locked by _M_caller.</div><div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  bool</div><div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  operator()() const noexcept</div><div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  { return _M_mx->_M_count == 0 || _M_mx->_M_owner == _M_caller; }</div><div class="line"><a name="l00377"></a><span class="lineno"> 377</span> </div><div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  const recursive_timed_mutex* _M_mx;</div><div class="line"><a name="l00379"></a><span class="lineno"> 379</span>  thread::id _M_caller;</div><div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  };</div><div class="line"><a name="l00381"></a><span class="lineno"> 381</span> </div><div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  public:</div><div class="line"><a name="l00383"></a><span class="lineno"> 383</span> </div><div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  recursive_timed_mutex() = default;</div><div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  ~recursive_timed_mutex() { __glibcxx_assert( _M_count == 0 ); }</div><div class="line"><a name="l00386"></a><span class="lineno"> 386</span> </div><div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  recursive_timed_mutex(const recursive_timed_mutex&) = delete;</div><div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  recursive_timed_mutex& operator=(const recursive_timed_mutex&) = delete;</div><div class="line"><a name="l00389"></a><span class="lineno"> 389</span> </div><div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  void</div><div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  lock()</div><div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  {</div><div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  auto __id = this_thread::get_id();</div><div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  _Can_lock __can_lock{this, __id};</div><div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  unique_lock<mutex> __lk(_M_mut);</div><div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  _M_cv.wait(__lk, __can_lock);</div><div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  if (_M_count == -1u)</div><div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  __throw_system_error(EAGAIN); // [thread.timedmutex.recursive]/3</div><div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  _M_owner = __id;</div><div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  ++_M_count;</div><div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  }</div><div class="line"><a name="l00402"></a><span class="lineno"> 402</span> </div><div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  bool</div><div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  try_lock()</div><div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  {</div><div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  auto __id = this_thread::get_id();</div><div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  _Can_lock __can_lock{this, __id};</div><div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  lock_guard<mutex> __lk(_M_mut);</div><div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  if (!__can_lock())</div><div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  return false;</div><div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  if (_M_count == -1u)</div><div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  return false;</div><div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  _M_owner = __id;</div><div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  ++_M_count;</div><div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  return true;</div><div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  }</div><div class="line"><a name="l00417"></a><span class="lineno"> 417</span> </div><div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  template<typename _Rep, typename _Period></div><div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  bool</div><div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  try_lock_for(const chrono::duration<_Rep, _Period>& __rtime)</div><div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  {</div><div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  auto __id = this_thread::get_id();</div><div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  _Can_lock __can_lock{this, __id};</div><div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  unique_lock<mutex> __lk(_M_mut);</div><div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  if (!_M_cv.wait_for(__lk, __rtime, __can_lock))</div><div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  return false;</div><div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  if (_M_count == -1u)</div><div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  return false;</div><div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  _M_owner = __id;</div><div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  ++_M_count;</div><div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  return true;</div><div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  }</div><div class="line"><a name="l00433"></a><span class="lineno"> 433</span> </div><div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  template<typename _Clock, typename _Duration></div><div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  bool</div><div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  try_lock_until(const chrono::time_point<_Clock, _Duration>& __atime)</div><div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  {</div><div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  auto __id = this_thread::get_id();</div><div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  _Can_lock __can_lock{this, __id};</div><div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  unique_lock<mutex> __lk(_M_mut);</div><div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  if (!_M_cv.wait_until(__lk, __atime, __can_lock))</div><div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  return false;</div><div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  if (_M_count == -1u)</div><div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  return false;</div><div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  _M_owner = __id;</div><div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  ++_M_count;</div><div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  return true;</div><div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  }</div><div class="line"><a name="l00449"></a><span class="lineno"> 449</span> </div><div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  void</div><div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  unlock()</div><div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  {</div><div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  lock_guard<mutex> __lk(_M_mut);</div><div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  __glibcxx_assert( _M_owner == this_thread::get_id() );</div><div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  __glibcxx_assert( _M_count > 0 );</div><div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  if (--_M_count == 0)</div><div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  {</div><div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  _M_owner = {};</div><div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  _M_cv.notify_one();</div><div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  }</div><div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  }</div><div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  };</div><div class="line"><a name="l00463"></a><span class="lineno"> 463</span> </div><div class="line"><a name="l00464"></a><span class="lineno"> 464</span> #endif</div><div class="line"><a name="l00465"></a><span class="lineno"> 465</span> #endif // _GLIBCXX_HAS_GTHREADS</div><div class="line"><a name="l00466"></a><span class="lineno"> 466</span> </div><div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  template<typename _Lock></div><div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  inline unique_lock<_Lock></div><div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  __try_to_lock(_Lock& __l)</div><div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  { return unique_lock<_Lock>{__l, try_to_lock}; }</div><div class="line"><a name="l00471"></a><span class="lineno"> 471</span> </div><div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  template<int _Idx, bool _Continue = true></div><div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  struct __try_lock_impl</div><div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  {</div><div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  template<typename... _Lock></div><div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  static void</div><div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  __do_try_lock(tuple<_Lock&...>& __locks, int& __idx)</div><div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  {</div><div class="line"><a name="l00479"></a><span class="lineno"> 479</span>  __idx = _Idx;</div><div class="line"><a name="l00480"></a><span class="lineno"> 480</span>  auto __lock = std::__try_to_lock(std::get<_Idx>(__locks));</div><div class="line"><a name="l00481"></a><span class="lineno"> 481</span>  if (__lock.owns_lock())</div><div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  {</div><div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  constexpr bool __cont = _Idx + 2 < sizeof...(_Lock);</div><div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  using __try_locker = __try_lock_impl<_Idx + 1, __cont>;</div><div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  __try_locker::__do_try_lock(__locks, __idx);</div><div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  if (__idx == -1)</div><div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  __lock.release();</div><div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  }</div><div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  }</div><div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  };</div><div class="line"><a name="l00491"></a><span class="lineno"> 491</span> </div><div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  template<int _Idx></div><div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  struct __try_lock_impl<_Idx, false></div><div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  {</div><div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  template<typename... _Lock></div><div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  static void</div><div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  __do_try_lock(tuple<_Lock&...>& __locks, int& __idx)</div><div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  {</div><div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  __idx = _Idx;</div><div class="line"><a name="l00500"></a><span class="lineno"> 500</span>  auto __lock = std::__try_to_lock(std::get<_Idx>(__locks));</div><div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  if (__lock.owns_lock())</div><div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  {</div><div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  __idx = -1;</div><div class="line"><a name="l00504"></a><span class="lineno"> 504</span>  __lock.release();</div><div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  }</div><div class="line"><a name="l00506"></a><span class="lineno"> 506</span>  }</div><div class="line"><a name="l00507"></a><span class="lineno"> 507</span>  };</div><div class="line"><a name="l00508"></a><span class="lineno"> 508</span> </div><div class="line"><a name="l00509"></a><span class="lineno"> 509</span>  /** @brief Generic try_lock.</div><div class="line"><a name="l00510"></a><span class="lineno"> 510</span>  * @param __l1 Meets Lockable requirements (try_lock() may throw).</div><div class="line"><a name="l00511"></a><span class="lineno"> 511</span>  * @param __l2 Meets Lockable requirements (try_lock() may throw).</div><div class="line"><a name="l00512"></a><span class="lineno"> 512</span>  * @param __l3 Meets Lockable requirements (try_lock() may throw).</div><div class="line"><a name="l00513"></a><span class="lineno"> 513</span>  * @return Returns -1 if all try_lock() calls return true. Otherwise returns</div><div class="line"><a name="l00514"></a><span class="lineno"> 514</span>  * a 0-based index corresponding to the argument that returned false.</div><div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  * @post Either all arguments are locked, or none will be.</div><div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  *</div><div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  * Sequentially calls try_lock() on each argument.</div><div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  */</div><div class="line"><a name="l00519"></a><span class="lineno"> 519</span>  template<typename _Lock1, typename _Lock2, typename... _Lock3></div><div class="line"><a name="l00520"></a><span class="lineno"> 520</span>  int</div><div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  try_lock(_Lock1& __l1, _Lock2& __l2, _Lock3&... __l3)</div><div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  {</div><div class="line"><a name="l00523"></a><span class="lineno"> 523</span>  int __idx;</div><div class="line"><a name="l00524"></a><span class="lineno"> 524</span>  auto __locks = std::tie(__l1, __l2, __l3...);</div><div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  __try_lock_impl<0>::__do_try_lock(__locks, __idx);</div><div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  return __idx;</div><div class="line"><a name="l00527"></a><span class="lineno"> 527</span>  }</div><div class="line"><a name="l00528"></a><span class="lineno"> 528</span> </div><div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  /** @brief Generic lock.</div><div class="line"><a name="l00530"></a><span class="lineno"> 530</span>  * @param __l1 Meets Lockable requirements (try_lock() may throw).</div><div class="line"><a name="l00531"></a><span class="lineno"> 531</span>  * @param __l2 Meets Lockable requirements (try_lock() may throw).</div><div class="line"><a name="l00532"></a><span class="lineno"> 532</span>  * @param __l3 Meets Lockable requirements (try_lock() may throw).</div><div class="line"><a name="l00533"></a><span class="lineno"> 533</span>  * @throw An exception thrown by an argument's lock() or try_lock() member.</div><div class="line"><a name="l00534"></a><span class="lineno"> 534</span>  * @post All arguments are locked.</div><div class="line"><a name="l00535"></a><span class="lineno"> 535</span>  *</div><div class="line"><a name="l00536"></a><span class="lineno"> 536</span>  * All arguments are locked via a sequence of calls to lock(), try_lock()</div><div class="line"><a name="l00537"></a><span class="lineno"> 537</span>  * and unlock(). If the call exits via an exception any locks that were</div><div class="line"><a name="l00538"></a><span class="lineno"> 538</span>  * obtained will be released.</div><div class="line"><a name="l00539"></a><span class="lineno"> 539</span>  */</div><div class="line"><a name="l00540"></a><span class="lineno"> 540</span>  template<typename _L1, typename _L2, typename... _L3></div><div class="line"><a name="l00541"></a><span class="lineno"> 541</span>  void</div><div class="line"><a name="l00542"></a><span class="lineno"> 542</span>  lock(_L1& __l1, _L2& __l2, _L3&... __l3)</div><div class="line"><a name="l00543"></a><span class="lineno"> 543</span>  {</div><div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  while (true)</div><div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  {</div><div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  using __try_locker = __try_lock_impl<0, sizeof...(_L3) != 0>;</div><div class="line"><a name="l00547"></a><span class="lineno"> 547</span>  unique_lock<_L1> __first(__l1);</div><div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  int __idx;</div><div class="line"><a name="l00549"></a><span class="lineno"> 549</span>  auto __locks = std::tie(__l2, __l3...);</div><div class="line"><a name="l00550"></a><span class="lineno"> 550</span>  __try_locker::__do_try_lock(__locks, __idx);</div><div class="line"><a name="l00551"></a><span class="lineno"> 551</span>  if (__idx == -1)</div><div class="line"><a name="l00552"></a><span class="lineno"> 552</span>  {</div><div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  __first.release();</div><div class="line"><a name="l00554"></a><span class="lineno"> 554</span>  return;</div><div class="line"><a name="l00555"></a><span class="lineno"> 555</span>  }</div><div class="line"><a name="l00556"></a><span class="lineno"> 556</span>  }</div><div class="line"><a name="l00557"></a><span class="lineno"> 557</span>  }</div><div class="line"><a name="l00558"></a><span class="lineno"> 558</span> </div><div class="line"><a name="l00559"></a><span class="lineno"> 559</span> #if __cplusplus >= 201703L</div><div class="line"><a name="l00560"></a><span class="lineno"> 560</span> #define __cpp_lib_scoped_lock 201703</div><div class="line"><a name="l00561"></a><span class="lineno"> 561</span>  /** @brief A scoped lock type for multiple lockable objects.</div><div class="line"><a name="l00562"></a><span class="lineno"> 562</span>  *</div><div class="line"><a name="l00563"></a><span class="lineno"> 563</span>  * A scoped_lock controls mutex ownership within a scope, releasing</div><div class="line"><a name="l00564"></a><span class="lineno"> 564</span>  * ownership in the destructor.</div><div class="line"><a name="l00565"></a><span class="lineno"> 565</span>  */</div><div class="line"><a name="l00566"></a><span class="lineno"> 566</span>  template<typename... _MutexTypes></div><div class="line"><a name="l00567"></a><span class="lineno"> 567</span>  class scoped_lock</div><div class="line"><a name="l00568"></a><span class="lineno"> 568</span>  {</div><div class="line"><a name="l00569"></a><span class="lineno"> 569</span>  public:</div><div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  explicit scoped_lock(_MutexTypes&... __m) : _M_devices(std::tie(__m...))</div><div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  { std::lock(__m...); }</div><div class="line"><a name="l00572"></a><span class="lineno"> 572</span> </div><div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  explicit scoped_lock(adopt_lock_t, _MutexTypes&... __m) noexcept</div><div class="line"><a name="l00574"></a><span class="lineno"> 574</span>  : _M_devices(std::tie(__m...))</div><div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  { } // calling thread owns mutex</div><div class="line"><a name="l00576"></a><span class="lineno"> 576</span> </div><div class="line"><a name="l00577"></a><span class="lineno"> 577</span>  ~scoped_lock()</div><div class="line"><a name="l00578"></a><span class="lineno"> 578</span>  {</div><div class="line"><a name="l00579"></a><span class="lineno"> 579</span>  std::apply([](_MutexTypes&... __m) {</div><div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  char __i[] __attribute__((__unused__)) = { (__m.unlock(), 0)... };</div><div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  }, _M_devices);</div><div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  }</div><div class="line"><a name="l00583"></a><span class="lineno"> 583</span> </div><div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  scoped_lock(const scoped_lock&) = delete;</div><div class="line"><a name="l00585"></a><span class="lineno"> 585</span>  scoped_lock& operator=(const scoped_lock&) = delete;</div><div class="line"><a name="l00586"></a><span class="lineno"> 586</span> </div><div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  private:</div><div class="line"><a name="l00588"></a><span class="lineno"> 588</span>  tuple<_MutexTypes&...> _M_devices;</div><div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  };</div><div class="line"><a name="l00590"></a><span class="lineno"> 590</span> </div><div class="line"><a name="l00591"></a><span class="lineno"> 591</span>  template<></div><div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  class scoped_lock<></div><div class="line"><a name="l00593"></a><span class="lineno"> 593</span>  {</div><div class="line"><a name="l00594"></a><span class="lineno"> 594</span>  public:</div><div class="line"><a name="l00595"></a><span class="lineno"> 595</span>  explicit scoped_lock() = default;</div><div class="line"><a name="l00596"></a><span class="lineno"> 596</span>  explicit scoped_lock(adopt_lock_t) noexcept { }</div><div class="line"><a name="l00597"></a><span class="lineno"> 597</span>  ~scoped_lock() = default;</div><div class="line"><a name="l00598"></a><span class="lineno"> 598</span> </div><div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  scoped_lock(const scoped_lock&) = delete;</div><div class="line"><a name="l00600"></a><span class="lineno"> 600</span>  scoped_lock& operator=(const scoped_lock&) = delete;</div><div class="line"><a name="l00601"></a><span class="lineno"> 601</span>  };</div><div class="line"><a name="l00602"></a><span class="lineno"> 602</span> </div><div class="line"><a name="l00603"></a><span class="lineno"> 603</span>  template<typename _Mutex></div><div class="line"><a name="l00604"></a><span class="lineno"> 604</span>  class scoped_lock<_Mutex></div><div class="line"><a name="l00605"></a><span class="lineno"> 605</span>  {</div><div class="line"><a name="l00606"></a><span class="lineno"> 606</span>  public:</div><div class="line"><a name="l00607"></a><span class="lineno"> 607</span>  using mutex_type = _Mutex;</div><div class="line"><a name="l00608"></a><span class="lineno"> 608</span> </div><div class="line"><a name="l00609"></a><span class="lineno"> 609</span>  explicit scoped_lock(mutex_type& __m) : _M_device(__m)</div><div class="line"><a name="l00610"></a><span class="lineno"> 610</span>  { _M_device.lock(); }</div><div class="line"><a name="l00611"></a><span class="lineno"> 611</span> </div><div class="line"><a name="l00612"></a><span class="lineno"> 612</span>  explicit scoped_lock(adopt_lock_t, mutex_type& __m) noexcept</div><div class="line"><a name="l00613"></a><span class="lineno"> 613</span>  : _M_device(__m)</div><div class="line"><a name="l00614"></a><span class="lineno"> 614</span>  { } // calling thread owns mutex</div><div class="line"><a name="l00615"></a><span class="lineno"> 615</span> </div><div class="line"><a name="l00616"></a><span class="lineno"> 616</span>  ~scoped_lock()</div><div class="line"><a name="l00617"></a><span class="lineno"> 617</span>  { _M_device.unlock(); }</div><div class="line"><a name="l00618"></a><span class="lineno"> 618</span> </div><div class="line"><a name="l00619"></a><span class="lineno"> 619</span>  scoped_lock(const scoped_lock&) = delete;</div><div class="line"><a name="l00620"></a><span class="lineno"> 620</span>  scoped_lock& operator=(const scoped_lock&) = delete;</div><div class="line"><a name="l00621"></a><span class="lineno"> 621</span> </div><div class="line"><a name="l00622"></a><span class="lineno"> 622</span>  private:</div><div class="line"><a name="l00623"></a><span class="lineno"> 623</span>  mutex_type& _M_device;</div><div class="line"><a name="l00624"></a><span class="lineno"> 624</span>  };</div><div class="line"><a name="l00625"></a><span class="lineno"> 625</span> #endif // C++17</div><div class="line"><a name="l00626"></a><span class="lineno"> 626</span> </div><div class="line"><a name="l00627"></a><span class="lineno"> 627</span> #ifdef _GLIBCXX_HAS_GTHREADS</div><div class="line"><a name="l00628"></a><span class="lineno"> 628</span>  /// once_flag</div><div class="line"><a name="l00629"></a><span class="lineno"> 629</span>  struct once_flag</div><div class="line"><a name="l00630"></a><span class="lineno"> 630</span>  {</div><div class="line"><a name="l00631"></a><span class="lineno"> 631</span>  private:</div><div class="line"><a name="l00632"></a><span class="lineno"> 632</span>  typedef __gthread_once_t __native_type;</div><div class="line"><a name="l00633"></a><span class="lineno"> 633</span>  __native_type _M_once = __GTHREAD_ONCE_INIT;</div><div class="line"><a name="l00634"></a><span class="lineno"> 634</span> </div><div class="line"><a name="l00635"></a><span class="lineno"> 635</span>  public:</div><div class="line"><a name="l00636"></a><span class="lineno"> 636</span>  /// Constructor</div><div class="line"><a name="l00637"></a><span class="lineno"> 637</span>  constexpr once_flag() noexcept = default;</div><div class="line"><a name="l00638"></a><span class="lineno"> 638</span> </div><div class="line"><a name="l00639"></a><span class="lineno"> 639</span>  /// Deleted copy constructor</div><div class="line"><a name="l00640"></a><span class="lineno"> 640</span>  once_flag(const once_flag&) = delete;</div><div class="line"><a name="l00641"></a><span class="lineno"> 641</span>  /// Deleted assignment operator</div><div class="line"><a name="l00642"></a><span class="lineno"> 642</span>  once_flag& operator=(const once_flag&) = delete;</div><div class="line"><a name="l00643"></a><span class="lineno"> 643</span> </div><div class="line"><a name="l00644"></a><span class="lineno"> 644</span>  template<typename _Callable, typename... _Args></div><div class="line"><a name="l00645"></a><span class="lineno"> 645</span>  friend void</div><div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  call_once(once_flag& __once, _Callable&& __f, _Args&&... __args);</div><div class="line"><a name="l00647"></a><span class="lineno"> 647</span>  };</div><div class="line"><a name="l00648"></a><span class="lineno"> 648</span> </div><div class="line"><a name="l00649"></a><span class="lineno"> 649</span> #ifdef _GLIBCXX_HAVE_TLS</div><div class="line"><a name="l00650"></a><span class="lineno"> 650</span>  extern __thread void* __once_callable;</div><div class="line"><a name="l00651"></a><span class="lineno"> 651</span>  extern __thread void (*__once_call)();</div><div class="line"><a name="l00652"></a><span class="lineno"> 652</span> #else</div><div class="line"><a name="l00653"></a><span class="lineno"> 653</span>  extern function<void()> __once_functor;</div><div class="line"><a name="l00654"></a><span class="lineno"> 654</span> </div><div class="line"><a name="l00655"></a><span class="lineno"> 655</span>  extern void</div><div class="line"><a name="l00656"></a><span class="lineno"> 656</span>  __set_once_functor_lock_ptr(unique_lock<mutex>*);</div><div class="line"><a name="l00657"></a><span class="lineno"> 657</span> </div><div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  extern mutex&</div><div class="line"><a name="l00659"></a><span class="lineno"> 659</span>  __get_once_mutex();</div><div class="line"><a name="l00660"></a><span class="lineno"> 660</span> #endif</div><div class="line"><a name="l00661"></a><span class="lineno"> 661</span> </div><div class="line"><a name="l00662"></a><span class="lineno"> 662</span>  extern "C" void __once_proxy(void);</div><div class="line"><a name="l00663"></a><span class="lineno"> 663</span> </div><div class="line"><a name="l00664"></a><span class="lineno"> 664</span>  /// call_once</div><div class="line"><a name="l00665"></a><span class="lineno"> 665</span>  template<typename _Callable, typename... _Args></div><div class="line"><a name="l00666"></a><span class="lineno"> 666</span>  void</div><div class="line"><a name="l00667"></a><span class="lineno"> 667</span>  call_once(once_flag& __once, _Callable&& __f, _Args&&... __args)</div><div class="line"><a name="l00668"></a><span class="lineno"> 668</span>  {</div><div class="line"><a name="l00669"></a><span class="lineno"> 669</span>  // _GLIBCXX_RESOLVE_LIB_DEFECTS</div><div class="line"><a name="l00670"></a><span class="lineno"> 670</span>  // 2442. call_once() shouldn't DECAY_COPY()</div><div class="line"><a name="l00671"></a><span class="lineno"> 671</span>  auto __callable = [&] {</div><div class="line"><a name="l00672"></a><span class="lineno"> 672</span>  std::__invoke(std::forward<_Callable>(__f),</div><div class="line"><a name="l00673"></a><span class="lineno"> 673</span>  std::forward<_Args>(__args)...);</div><div class="line"><a name="l00674"></a><span class="lineno"> 674</span>  };</div><div class="line"><a name="l00675"></a><span class="lineno"> 675</span> #ifdef _GLIBCXX_HAVE_TLS</div><div class="line"><a name="l00676"></a><span class="lineno"> 676</span>  __once_callable = std::__addressof(__callable);</div><div class="line"><a name="l00677"></a><span class="lineno"> 677</span>  __once_call = []{ (*(decltype(__callable)*)__once_callable)(); };</div><div class="line"><a name="l00678"></a><span class="lineno"> 678</span> #else</div><div class="line"><a name="l00679"></a><span class="lineno"> 679</span>  unique_lock<mutex> __functor_lock(__get_once_mutex());</div><div class="line"><a name="l00680"></a><span class="lineno"> 680</span>  __once_functor = __callable;</div><div class="line"><a name="l00681"></a><span class="lineno"> 681</span>  __set_once_functor_lock_ptr(&__functor_lock);</div><div class="line"><a name="l00682"></a><span class="lineno"> 682</span> #endif</div><div class="line"><a name="l00683"></a><span class="lineno"> 683</span> </div><div class="line"><a name="l00684"></a><span class="lineno"> 684</span>  int __e = __gthread_once(&__once._M_once, &__once_proxy);</div><div class="line"><a name="l00685"></a><span class="lineno"> 685</span> </div><div class="line"><a name="l00686"></a><span class="lineno"> 686</span> #ifndef _GLIBCXX_HAVE_TLS</div><div class="line"><a name="l00687"></a><span class="lineno"> 687</span>  if (__functor_lock)</div><div class="line"><a name="l00688"></a><span class="lineno"> 688</span>  __set_once_functor_lock_ptr(0);</div><div class="line"><a name="l00689"></a><span class="lineno"> 689</span> #endif</div><div class="line"><a name="l00690"></a><span class="lineno"> 690</span> </div><div class="line"><a name="l00691"></a><span class="lineno"> 691</span> #ifdef __clang_analyzer__</div><div class="line"><a name="l00692"></a><span class="lineno"> 692</span>  // PR libstdc++/82481</div><div class="line"><a name="l00693"></a><span class="lineno"> 693</span>  __once_callable = nullptr;</div><div class="line"><a name="l00694"></a><span class="lineno"> 694</span>  __once_call = nullptr;</div><div class="line"><a name="l00695"></a><span class="lineno"> 695</span> #endif</div><div class="line"><a name="l00696"></a><span class="lineno"> 696</span> </div><div class="line"><a name="l00697"></a><span class="lineno"> 697</span>  if (__e)</div><div class="line"><a name="l00698"></a><span class="lineno"> 698</span>  __throw_system_error(__e);</div><div class="line"><a name="l00699"></a><span class="lineno"> 699</span>  }</div><div class="line"><a name="l00700"></a><span class="lineno"> 700</span> #endif // _GLIBCXX_HAS_GTHREADS</div><div class="line"><a name="l00701"></a><span class="lineno"> 701</span> </div><div class="line"><a name="l00702"></a><span class="lineno"> 702</span>  // @} group mutexes</div><div class="line"><a name="l00703"></a><span class="lineno"> 703</span> _GLIBCXX_END_NAMESPACE_VERSION</div><div class="line"><a name="l00704"></a><span class="lineno"> 704</span> } // namespace</div><div class="line"><a name="l00705"></a><span class="lineno"> 705</span> #endif // _GLIBCXX_USE_C99_STDINT_TR1</div><div class="line"><a name="l00706"></a><span class="lineno"> 706</span> </div><div class="line"><a name="l00707"></a><span class="lineno"> 707</span> #endif // C++11</div><div class="line"><a name="l00708"></a><span class="lineno"> 708</span> </div><div class="line"><a name="l00709"></a><span class="lineno"> 709</span> #endif // _GLIBCXX_MUTEX</div></div><!-- fragment --></div><!-- contents -->
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