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<div class="title">shared.hpp</div> </div>
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<a href="3rdparty_2libprocess_2include_2process_2shared_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">// you may not use this file except in compliance with the License.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// You may obtain a copy of the License at</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment">// distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment">// See the License for the specific language governing permissions and</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment">// limitations under the License</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;</div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="preprocessor">#ifndef __PROCESS_SHARED_HPP__</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define __PROCESS_SHARED_HPP__</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="preprocessor">#include &lt;atomic&gt;</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="preprocessor">#include &lt;memory&gt;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="preprocessor">#include &lt;glog/logging.h&gt;</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="future_8hpp.html">process/future.hpp</a>&gt;</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespaceos.html#ae19e4161a51b86a1f330f3bf1dc75389">process</a> {</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="comment">// Forward declaration.</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="keyword">class </span>Owned;</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;<span class="comment">// Represents a shared pointer and therefore enforces &#39;const&#39; access.</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="keyword">class </span>Shared</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;{</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="keyword">public</span>:</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; <a class="code" href="classprocess_1_1Shared.html#aadaef640c97e060e83bf285bf9eac401">Shared</a>();</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; <span class="keyword">explicit</span> <a class="code" href="classprocess_1_1Shared.html#aadaef640c97e060e83bf285bf9eac401">Shared</a>(T* t);</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160; <span class="keywordtype">bool</span> <a class="code" href="classprocess_1_1Shared.html#a3c929e667ce6a6fd45b56a81fd16a766">operator==</a>(<span class="keyword">const</span> Shared&lt;T&gt;&amp; that) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; <span class="keywordtype">bool</span> operator&lt;(const Shared&lt;T&gt;&amp; that) <span class="keyword">const</span>;</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; <span class="comment">// Enforces const access semantics.</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; <span class="keyword">const</span> T&amp; <a class="code" href="classprocess_1_1Shared.html#ae2f71627879ac69d8732d70f2cf5810b">operator*</a>() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; <span class="keyword">const</span> T* <a class="code" href="classprocess_1_1Shared.html#aeb4d74c937660e50c912d79bb84ef754">operator-&gt;</a>() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160; <span class="keyword">const</span> T* <span class="keyword">get</span>() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; <span class="keywordtype">bool</span> <a class="code" href="classprocess_1_1Shared.html#a5a4fd275e890e3c5e81dd7aed1d804b0">unique</a>() <span class="keyword">const</span>;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; <span class="keywordtype">void</span> <a class="code" href="classprocess_1_1Shared.html#adb2203cf8bb3a39b42096e3cef47e906">reset</a>();</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; <span class="keywordtype">void</span> <a class="code" href="classprocess_1_1Shared.html#adb2203cf8bb3a39b42096e3cef47e906">reset</a>(T* t);</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; <span class="keywordtype">void</span> <a class="code" href="classprocess_1_1Shared.html#a19e2e0a3ef672d789324ff92db6e30dc">swap</a>(Shared&lt;T&gt;&amp; that);</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; <span class="comment">// Transfers ownership of the pointer by waiting for exclusive</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="comment">// access (i.e., no other Shared instances). This shared pointer</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; <span class="comment">// will be reset after this function is invoked. If multiple shared</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="comment">// pointers pointing to the same object all want to be upgraded,</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; <span class="comment">// only one of them may succeed and the rest will get failures.</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; Future&lt;Owned&lt;T&gt;&gt; <a class="code" href="classprocess_1_1Shared.html#a84986b276de9b6d1b525c64d944c6797">own</a>();</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160;<span class="keyword">private</span>:</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="keyword">struct </span>Data</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; {</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; <span class="keyword">explicit</span> Data(T* _t);</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; ~Data();</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; T* t;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; std::atomic_bool owned;</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; Promise&lt;Owned&lt;T&gt;&gt; <a class="code" href="namespacemesos_1_1internal_1_1log_1_1protocol.html#a3b1f8bd7b18c51af9d1f58842950b545">promise</a>;</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; };</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; std::shared_ptr&lt;Data&gt; data;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;};</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00075"></a><span class="lineno"><a class="line" href="classprocess_1_1Shared.html#aadaef640c97e060e83bf285bf9eac401"> 75</a></span>&#160;<a class="code" href="classprocess_1_1Shared.html#aadaef640c97e060e83bf285bf9eac401">Shared&lt;T&gt;::Shared</a>() {}</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00079"></a><span class="lineno"><a class="line" href="classprocess_1_1Shared.html#abb6c5ab0f711bdee4455201e4a812d47"> 79</a></span>&#160;<a class="code" href="classprocess_1_1Shared.html#aadaef640c97e060e83bf285bf9eac401">Shared&lt;T&gt;::Shared</a>(T* t)</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;{</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; <span class="keywordflow">if</span> (t != <span class="keyword">nullptr</span>) {</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; data.reset(<span class="keyword">new</span> Data(t));</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; }</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;}</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00088"></a><span class="lineno"><a class="line" href="classprocess_1_1Shared.html#a3c929e667ce6a6fd45b56a81fd16a766"> 88</a></span>&#160;<span class="keywordtype">bool</span> <a class="code" href="classprocess_1_1Shared.html#a3c929e667ce6a6fd45b56a81fd16a766">Shared&lt;T&gt;::operator==</a>(<span class="keyword">const</span> <a class="code" href="classprocess_1_1Shared.html">Shared&lt;T&gt;</a>&amp; that)<span class="keyword"> const</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; <span class="keywordflow">return</span> data == that.data;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160;}</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00095"></a><span class="lineno"><a class="line" href="classprocess_1_1Shared.html#a8dab66aa15e3b5dafa463bb485bddbbd"> 95</a></span>&#160;<span class="keywordtype">bool</span> <a class="code" href="classprocess_1_1Shared.html#a8dab66aa15e3b5dafa463bb485bddbbd">Shared&lt;T&gt;::operator&lt;</a>(<span class="keyword">const</span> <a class="code" href="classprocess_1_1Shared.html">Shared&lt;T&gt;</a>&amp; that)<span class="keyword"> const</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="keywordflow">return</span> data &lt; that.data;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160;}</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00102"></a><span class="lineno"><a class="line" href="classprocess_1_1Shared.html#ae2f71627879ac69d8732d70f2cf5810b"> 102</a></span>&#160;<span class="keyword">const</span> T&amp; <a class="code" href="classprocess_1_1Shared.html#ae2f71627879ac69d8732d70f2cf5810b">Shared&lt;T&gt;::operator*</a>()<span class="keyword"> const</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; <span class="keywordflow">return</span> *CHECK_NOTNULL(<span class="keyword">get</span>());</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160;}</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160;</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00109"></a><span class="lineno"><a class="line" href="classprocess_1_1Shared.html#aeb4d74c937660e50c912d79bb84ef754"> 109</a></span>&#160;<span class="keyword">const</span> T* <a class="code" href="classprocess_1_1Shared.html#aeb4d74c937660e50c912d79bb84ef754">Shared&lt;T&gt;::operator-&gt;</a>()<span class="keyword"> const</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; <span class="keywordflow">return</span> CHECK_NOTNULL(<span class="keyword">get</span>());</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160;}</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00116"></a><span class="lineno"><a class="line" href="classprocess_1_1Shared.html#a1826ec84528910fcec813d35993a1fd4"> 116</a></span>&#160;<span class="keyword">const</span> T* <a class="code" href="classprocess_1_1Shared.html#a1826ec84528910fcec813d35993a1fd4">Shared&lt;T&gt;::get</a>()<span class="keyword"> const</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; <span class="keywordflow">if</span> (data.get() == <span class="keyword">nullptr</span>) {</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; <span class="keywordflow">return</span> data-&gt;t;</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; }</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160;}</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00127"></a><span class="lineno"><a class="line" href="classprocess_1_1Shared.html#a5a4fd275e890e3c5e81dd7aed1d804b0"> 127</a></span>&#160;<span class="keywordtype">bool</span> <a class="code" href="classprocess_1_1Shared.html#a5a4fd275e890e3c5e81dd7aed1d804b0">Shared&lt;T&gt;::unique</a>()<span class="keyword"> const</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; <span class="keywordflow">return</span> data.unique();</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160;}</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160;</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160;</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00134"></a><span class="lineno"><a class="line" href="classprocess_1_1Shared.html#adb2203cf8bb3a39b42096e3cef47e906"> 134</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classprocess_1_1Shared.html#adb2203cf8bb3a39b42096e3cef47e906">Shared&lt;T&gt;::reset</a>()</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160;{</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; data.reset();</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160;}</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160;</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160;</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00141"></a><span class="lineno"><a class="line" href="classprocess_1_1Shared.html#aa5eeda331799e0c747c0ccb1fed90bc5"> 141</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classprocess_1_1Shared.html#adb2203cf8bb3a39b42096e3cef47e906">Shared&lt;T&gt;::reset</a>(T* t)</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160;{</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160; <span class="keywordflow">if</span> (t == <span class="keyword">nullptr</span>) {</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; data.reset();</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; data.reset(<span class="keyword">new</span> Data(t));</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; }</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160;}</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160;</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160;</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00152"></a><span class="lineno"><a class="line" href="classprocess_1_1Shared.html#a19e2e0a3ef672d789324ff92db6e30dc"> 152</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classprocess_1_1Shared.html#a19e2e0a3ef672d789324ff92db6e30dc">Shared&lt;T&gt;::swap</a>(<a class="code" href="classprocess_1_1Shared.html">Shared&lt;T&gt;</a>&amp; that)</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160;{</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160; data.swap(that.data);</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160;}</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160;</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160;</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00159"></a><span class="lineno"><a class="line" href="classprocess_1_1Shared.html#a84986b276de9b6d1b525c64d944c6797"> 159</a></span>&#160;<a class="code" href="classprocess_1_1Future.html">Future&lt;Owned&lt;T&gt;</a>&gt; <a class="code" href="classprocess_1_1Shared.html#a84986b276de9b6d1b525c64d944c6797">Shared&lt;T&gt;::own</a>()</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160;{</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160; <span class="comment">// If two threads simultaneously access this object and at least one</span></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160; <span class="comment">// of them is a write, the behavior is undefined. This is similar to</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; <span class="comment">// boost::shared_ptr. For more details, please refer to the boost</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160; <span class="comment">// shared_ptr document (section &quot;Thread Safety&quot;).</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; <span class="keywordflow">if</span> (data.get() == <span class="keyword">nullptr</span>) {</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classprocess_1_1Owned.html">Owned&lt;T&gt;</a>(<span class="keyword">nullptr</span>);</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160; }</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160;</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160; <span class="keywordtype">bool</span> false_value = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160; <span class="keywordflow">if</span> (!data-&gt;owned.compare_exchange_strong(false_value, <span class="keyword">true</span>)) {</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160; <span class="keywordflow">return</span> <a class="code" href="structprocess_1_1Failure.html">Failure</a>(<span class="stringliteral">&quot;Ownership has already been transferred&quot;</span>);</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160; }</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160;</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160; <a class="code" href="classprocess_1_1Future.html">Future&lt;Owned&lt;T&gt;</a>&gt; future = data-&gt;promise.future();</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160; data.reset();</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160; <span class="keywordflow">return</span> future;</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160;}</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160;</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160;</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160;<a class="code" href="classprocess_1_1Shared.html">Shared&lt;T&gt;::Data::Data</a>(T* _t)</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160; : t(CHECK_NOTNULL(_t)), owned(false) {}</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160;</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160;Shared&lt;T&gt;::Data::~Data()</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160;{</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; <span class="keywordflow">if</span> (owned.load()) {</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160; <a class="code" href="namespacemesos_1_1internal_1_1log_1_1protocol.html#a3b1f8bd7b18c51af9d1f58842950b545">promise</a>.set(Owned&lt;T&gt;(t));</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160; <span class="keyword">delete</span> t;</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160; }</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>&#160;}</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>&#160;</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160;} <span class="comment">// namespace process {</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>&#160;</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>&#160;<span class="preprocessor">#endif // __PROCESS_SHARED_HPP__</span></div>
<div class="ttc" id="structprocess_1_1Failure_html"><div class="ttname"><a href="structprocess_1_1Failure.html">process::Failure</a></div><div class="ttdef"><b>Definition:</b> future.hpp:546</div></div>
<div class="ttc" id="classprocess_1_1Shared_html_adb2203cf8bb3a39b42096e3cef47e906"><div class="ttname"><a href="classprocess_1_1Shared.html#adb2203cf8bb3a39b42096e3cef47e906">process::Shared::reset</a></div><div class="ttdeci">void reset()</div><div class="ttdef"><b>Definition:</b> shared.hpp:134</div></div>
<div class="ttc" id="classprocess_1_1Shared_html_a8dab66aa15e3b5dafa463bb485bddbbd"><div class="ttname"><a href="classprocess_1_1Shared.html#a8dab66aa15e3b5dafa463bb485bddbbd">process::Shared::operator&lt;</a></div><div class="ttdeci">bool operator&lt;(const Shared&lt; T &gt; &amp;that) const </div><div class="ttdef"><b>Definition:</b> shared.hpp:95</div></div>
<div class="ttc" id="classprocess_1_1Shared_html_a3c929e667ce6a6fd45b56a81fd16a766"><div class="ttname"><a href="classprocess_1_1Shared.html#a3c929e667ce6a6fd45b56a81fd16a766">process::Shared::operator==</a></div><div class="ttdeci">bool operator==(const Shared&lt; T &gt; &amp;that) const </div><div class="ttdef"><b>Definition:</b> shared.hpp:88</div></div>
<div class="ttc" id="classprocess_1_1Shared_html"><div class="ttname"><a href="classprocess_1_1Shared.html">process::Shared</a></div><div class="ttdef"><b>Definition:</b> owned.hpp:25</div></div>
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<div class="ttc" id="future_8hpp_html"><div class="ttname"><a href="future_8hpp.html">future.hpp</a></div></div>
<div class="ttc" id="namespaceos_html_ae19e4161a51b86a1f330f3bf1dc75389"><div class="ttname"><a href="namespaceos.html#ae19e4161a51b86a1f330f3bf1dc75389">os::process</a></div><div class="ttdeci">Result&lt; Process &gt; process(pid_t pid)</div><div class="ttdef"><b>Definition:</b> freebsd.hpp:30</div></div>
<div class="ttc" id="classprocess_1_1Shared_html_aeb4d74c937660e50c912d79bb84ef754"><div class="ttname"><a href="classprocess_1_1Shared.html#aeb4d74c937660e50c912d79bb84ef754">process::Shared::operator-&gt;</a></div><div class="ttdeci">const T * operator-&gt;() const </div><div class="ttdef"><b>Definition:</b> shared.hpp:109</div></div>
<div class="ttc" id="classprocess_1_1Shared_html_aadaef640c97e060e83bf285bf9eac401"><div class="ttname"><a href="classprocess_1_1Shared.html#aadaef640c97e060e83bf285bf9eac401">process::Shared::Shared</a></div><div class="ttdeci">Shared()</div><div class="ttdef"><b>Definition:</b> shared.hpp:75</div></div>
<div class="ttc" id="classprocess_1_1Shared_html_ae2f71627879ac69d8732d70f2cf5810b"><div class="ttname"><a href="classprocess_1_1Shared.html#ae2f71627879ac69d8732d70f2cf5810b">process::Shared::operator*</a></div><div class="ttdeci">const T &amp; operator*() const </div><div class="ttdef"><b>Definition:</b> shared.hpp:102</div></div>
<div class="ttc" id="classprocess_1_1Shared_html_a84986b276de9b6d1b525c64d944c6797"><div class="ttname"><a href="classprocess_1_1Shared.html#a84986b276de9b6d1b525c64d944c6797">process::Shared::own</a></div><div class="ttdeci">Future&lt; Owned&lt; T &gt; &gt; own()</div><div class="ttdef"><b>Definition:</b> shared.hpp:159</div></div>
<div class="ttc" id="classprocess_1_1Owned_html"><div class="ttname"><a href="classprocess_1_1Owned.html">process::Owned</a></div><div class="ttdef"><b>Definition:</b> owned.hpp:35</div></div>
<div class="ttc" id="classprocess_1_1Shared_html_a1826ec84528910fcec813d35993a1fd4"><div class="ttname"><a href="classprocess_1_1Shared.html#a1826ec84528910fcec813d35993a1fd4">process::Shared::get</a></div><div class="ttdeci">const T * get() const </div><div class="ttdef"><b>Definition:</b> shared.hpp:116</div></div>
<div class="ttc" id="classprocess_1_1Shared_html_a19e2e0a3ef672d789324ff92db6e30dc"><div class="ttname"><a href="classprocess_1_1Shared.html#a19e2e0a3ef672d789324ff92db6e30dc">process::Shared::swap</a></div><div class="ttdeci">void swap(Shared&lt; T &gt; &amp;that)</div><div class="ttdef"><b>Definition:</b> shared.hpp:152</div></div>
<div class="ttc" id="classprocess_1_1Future_html"><div class="ttname"><a href="classprocess_1_1Future.html">process::Future</a></div><div class="ttdef"><b>Definition:</b> future.hpp:56</div></div>
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