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<li class="navelem"><a class="el" href="dir_68267d1309a1af8e8297ef4c3efbcdba.html">src</a></li><li class="navelem"><a class="el" href="dir_a18918b93668b435612395bbc2e8b82b.html">linux</a></li> </ul>
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<div class="title">sched.hpp</div> </div>
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<a href="sched_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 to the Apache Software Foundation (ASF) under one</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">// or more contributor license agreements. See the NOTICE file</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// distributed with this work for additional information</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment">// regarding copyright ownership. The ASF licenses this file</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment">// to you under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment">// &quot;License&quot;); you may not use this file except in compliance</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment">// with the License. You may obtain a copy of the License at</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</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="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment">// See the License for the specific language governing permissions and</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment">// limitations under the License.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="preprocessor">#ifndef __LINUX_SCHED_HPP__</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define __LINUX_SCHED_HPP__</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="comment">// This file contains Linux-only OS utilities.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="preprocessor">#ifndef __linux__</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#error &quot;linux/sched.hpp is only available on Linux systems.&quot;</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="preprocessor">#include &lt;sched.h&gt;</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="comment">// Some old distributions, e.g., Redhat 5.5, do not correctly include</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="comment">// linux/sched.h.</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="preprocessor">#include &lt;linux/sched.h&gt;</span></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;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="preprocessor">#include &lt;sys/types.h&gt;</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="error_8hpp.html">stout/error.hpp</a>&gt;</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="none_8hpp.html">stout/none.hpp</a>&gt;</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="nothing_8hpp.html">stout/nothing.hpp</a>&gt;</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="option_8hpp.html">stout/option.hpp</a>&gt;</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="try_8hpp.html">stout/try.hpp</a>&gt;</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;</div>
<div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="namespacesched.html"> 39</a></span>&#160;<span class="keyword">namespace </span>sched {</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"><a class="line" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0d"> 41</a></span>&#160;<span class="keyword">enum</span> <a class="code" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0d">Policy</a></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;{</div>
<div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da0249cd4af5697d05fc0ae0e9e8cb602c"> 43</a></span>&#160; <a class="code" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da0249cd4af5697d05fc0ae0e9e8cb602c">OTHER</a> = SCHED_OTHER, <span class="comment">// Default policy.</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"><a class="line" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da259f4bfe6bb04733cdf9650637eed85d"> 44</a></span>&#160; <a class="code" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da259f4bfe6bb04733cdf9650637eed85d">BATCH</a> = SCHED_BATCH, <span class="comment">// Non-interactive, CPU intensive.</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"><a class="line" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0daebaee7d1ec50f96b6ab8f531f92cf56e"> 45</a></span>&#160; <a class="code" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0daebaee7d1ec50f96b6ab8f531f92cf56e">IDLE</a> = SCHED_IDLE, <span class="comment">// Very low priority.</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da3b0554820cb08d52616cdfde896067d4"> 46</a></span>&#160; <a class="code" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da3b0554820cb08d52616cdfde896067d4">FIFO</a> = SCHED_FIFO, <span class="comment">// Realtime.</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"><a class="line" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da8964a9f6005e1a993ae167a3258feea5"> 47</a></span>&#160; <a class="code" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da8964a9f6005e1a993ae167a3258feea5">RR</a> = SCHED_RR <span class="comment">// Realtime, round-robin.</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160;};</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="namespacesched_1_1policy.html"> 51</a></span>&#160;<span class="keyword">namespace </span>policy {</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160;<span class="comment">// Return the current scheduling policy for the specified pid, or for</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160;<span class="comment">// the caller if pid is None() or zero.</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"><a class="line" href="namespacesched_1_1policy.html#aa37ce2066e3741ef2a9a8a29be5cc0dc"> 55</a></span>&#160;<span class="keyword">inline</span> <a class="code" href="classTry.html">Try&lt;Policy&gt;</a> <span class="keyword">get</span>(<span class="keyword">const</span> <a class="code" href="classOption.html">Option&lt;pid_t&gt;</a>&amp; pid = <a class="code" href="structNone.html">None</a>())</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;{</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; <span class="keywordtype">int</span> <a class="code" href="namespaceproc.html#a34396c6140a28f583dc13fee3c3c35d4">status</a> = sched_getscheduler(pid.isSome() ? pid.get() : 0);</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="keywordflow">if</span> (status == -1) {</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classErrnoError.html">ErrnoError</a>(<span class="stringliteral">&quot;Failed to get scheduler policy&quot;</span>);</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;</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; <span class="keywordflow">return</span> <span class="keyword">static_cast&lt;</span><a class="code" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0d">Policy</a><span class="keyword">&gt;</span>(<a class="code" href="namespaceproc.html#a34396c6140a28f583dc13fee3c3c35d4">status</a>);</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;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160;<span class="comment">// Set the scheduling policy for the specified pid, or for the caller</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;<span class="comment">// if pid is None() or zero. Only realtime scheduling policies (FIFO</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;<span class="comment">// and RR) accept a priority (within a range, see</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;<span class="comment">// sched_setscheduler(2)).</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160;<span class="comment">// TODO(idownes): Add wrappers around sched_get_priority_{min,max}.</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"><a class="line" href="namespacesched_1_1policy.html#a96002502928baa764f913e8bce175b32"> 72</a></span>&#160;<span class="keyword">inline</span> <a class="code" href="classTry.html">Try&lt;Nothing&gt;</a> <a class="code" href="namespacesched_1_1policy.html#a96002502928baa764f913e8bce175b32">set</a>(</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <a class="code" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0d">Policy</a> policy,</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; <span class="keyword">const</span> <a class="code" href="classOption.html">Option&lt;pid_t&gt;</a>&amp; pid = <a class="code" href="structNone.html">None</a>(),</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="keywordtype">int</span> priority = 0)</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; <span class="keywordflow">if</span> ((policy == <a class="code" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da0249cd4af5697d05fc0ae0e9e8cb602c">OTHER</a> || policy == <a class="code" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da259f4bfe6bb04733cdf9650637eed85d">BATCH</a> || policy == <a class="code" href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0daebaee7d1ec50f96b6ab8f531f92cf56e">IDLE</a>) &amp;&amp;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; priority != 0) {</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classError.html">Error</a>(<span class="stringliteral">&quot;Non-real-time scheduling policies only support priority = 0&quot;</span>);</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;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; sched_param param;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; param.sched_priority = priority;</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; <span class="keywordflow">if</span> (sched_setscheduler(pid.isSome() ? pid.get() : 0, policy, &amp;param) == -1) {</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classErrnoError.html">ErrnoError</a>(<span class="stringliteral">&quot;Failed to set scheduler policy&quot;</span>);</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; }</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; <span class="keywordflow">return</span> <a class="code" href="structNothing.html">Nothing</a>();</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160;}</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;} <span class="comment">// namespace policy {</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160;} <span class="comment">// namespace sched {</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160;<span class="preprocessor">#endif // __LINUX_SCHED_HPP__</span></div>
<div class="ttc" id="namespacesched_html_a51639e5b9ba17424593e5b263f867a0da3b0554820cb08d52616cdfde896067d4"><div class="ttname"><a href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da3b0554820cb08d52616cdfde896067d4">sched::FIFO</a></div><div class="ttdef"><b>Definition:</b> sched.hpp:46</div></div>
<div class="ttc" id="structNothing_html"><div class="ttname"><a href="structNothing.html">Nothing</a></div><div class="ttdef"><b>Definition:</b> nothing.hpp:16</div></div>
<div class="ttc" id="classError_html"><div class="ttname"><a href="classError.html">Error</a></div><div class="ttdef"><b>Definition:</b> errorbase.hpp:35</div></div>
<div class="ttc" id="classOption_html"><div class="ttname"><a href="classOption.html">Option&lt; pid_t &gt;</a></div></div>
<div class="ttc" id="classTry_html"><div class="ttname"><a href="classTry.html">Try</a></div><div class="ttdef"><b>Definition:</b> try.hpp:34</div></div>
<div class="ttc" id="namespaceproc_html_a34396c6140a28f583dc13fee3c3c35d4"><div class="ttname"><a href="namespaceproc.html#a34396c6140a28f583dc13fee3c3c35d4">proc::status</a></div><div class="ttdeci">Result&lt; ProcessStatus &gt; status(pid_t pid)</div><div class="ttdef"><b>Definition:</b> proc.hpp:166</div></div>
<div class="ttc" id="none_8hpp_html"><div class="ttname"><a href="none_8hpp.html">none.hpp</a></div></div>
<div class="ttc" id="classErrnoError_html"><div class="ttname"><a href="classErrnoError.html">ErrnoError</a></div><div class="ttdef"><b>Definition:</b> errorbase.hpp:44</div></div>
<div class="ttc" id="namespacesched_html_a51639e5b9ba17424593e5b263f867a0d"><div class="ttname"><a href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0d">sched::Policy</a></div><div class="ttdeci">Policy</div><div class="ttdef"><b>Definition:</b> sched.hpp:41</div></div>
<div class="ttc" id="namespacesched_html_a51639e5b9ba17424593e5b263f867a0daebaee7d1ec50f96b6ab8f531f92cf56e"><div class="ttname"><a href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0daebaee7d1ec50f96b6ab8f531f92cf56e">sched::IDLE</a></div><div class="ttdef"><b>Definition:</b> sched.hpp:45</div></div>
<div class="ttc" id="nothing_8hpp_html"><div class="ttname"><a href="nothing_8hpp.html">nothing.hpp</a></div></div>
<div class="ttc" id="namespacesched_html_a51639e5b9ba17424593e5b263f867a0da8964a9f6005e1a993ae167a3258feea5"><div class="ttname"><a href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da8964a9f6005e1a993ae167a3258feea5">sched::RR</a></div><div class="ttdef"><b>Definition:</b> sched.hpp:47</div></div>
<div class="ttc" id="option_8hpp_html"><div class="ttname"><a href="option_8hpp.html">option.hpp</a></div></div>
<div class="ttc" id="namespacesched_html_a51639e5b9ba17424593e5b263f867a0da0249cd4af5697d05fc0ae0e9e8cb602c"><div class="ttname"><a href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da0249cd4af5697d05fc0ae0e9e8cb602c">sched::OTHER</a></div><div class="ttdef"><b>Definition:</b> sched.hpp:43</div></div>
<div class="ttc" id="namespacesched_html_a51639e5b9ba17424593e5b263f867a0da259f4bfe6bb04733cdf9650637eed85d"><div class="ttname"><a href="namespacesched.html#a51639e5b9ba17424593e5b263f867a0da259f4bfe6bb04733cdf9650637eed85d">sched::BATCH</a></div><div class="ttdef"><b>Definition:</b> sched.hpp:44</div></div>
<div class="ttc" id="error_8hpp_html"><div class="ttname"><a href="error_8hpp.html">error.hpp</a></div></div>
<div class="ttc" id="structNone_html"><div class="ttname"><a href="structNone.html">None</a></div><div class="ttdef"><b>Definition:</b> none.hpp:27</div></div>
<div class="ttc" id="try_8hpp_html"><div class="ttname"><a href="try_8hpp.html">try.hpp</a></div></div>
<div class="ttc" id="namespacesched_1_1policy_html_a96002502928baa764f913e8bce175b32"><div class="ttname"><a href="namespacesched_1_1policy.html#a96002502928baa764f913e8bce175b32">sched::policy::set</a></div><div class="ttdeci">Try&lt; Nothing &gt; set(Policy policy, const Option&lt; pid_t &gt; &amp;pid=None(), int priority=0)</div><div class="ttdef"><b>Definition:</b> sched.hpp:72</div></div>
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