klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
aceaaeb27215be26ade6a73ee1d13970b5344668
hustoj/web/cppreference-zh/chmhelp/cpp-thread-jthread-joinable.html
klarkxy 196e706fe4 上传cppreference
2025-08-01 12:57:54 +08:00

128 lines
8.1 KiB
HTML
Raw Blame History

<!DOCTYPE html>
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>std::jthread::joinable</title>
<link rel="stylesheet" href="ext.css" />
<link rel="stylesheet" href="site_modules.css" />
</head>
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_jthread_joinable skin-cppreference2 action-view cpp-page-template cpp-navbar">
<div id="cpp-content-base">
<div id="content"><a id="top"></a>
<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::jthread::</span>joinable</h1>
<div id="bodyContent">
<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-thread.html">thread</a>&lrm; | <a href="cpp-thread-jthread.html">jthread</a></span></div>
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
<div class="t-page-template" style="">
<p></p>
</div>
<table class="t-dcl-begin">
<tbody>
<tr class="t-dcl t-since-cxx20">
<td>
<div><span class="mw-geshi cpp source-cpp"><span class="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">bool</span> joinable<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>&#26816;&#26597; <code>std::jthread</code> &#23545;&#35937;&#26159;&#21542;&#26631;&#35782;&#27963;&#36291;&#30340;&#25191;&#34892;&#32447;&#31243;&#12290;&#20855;&#20307;&#32780;&#35328;&#65292;&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">get_id<span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">jthread</span><span class="sy4">::</span><span class="me2">id</span><span class="br0">(</span><span class="br0">)</span></span></span> &#21017;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#12290;&#25925;&#40664;&#35748;&#26500;&#36896;&#30340; jthread &#19981;&#21487;&#32467;&#21512;&#12290;</p>
<p>&#32467;&#26463;&#25191;&#34892;&#20195;&#30721;&#65292;&#20294;&#20173;&#26410;&#32467;&#21512;&#30340;&#32447;&#31243;&#20173;&#34987;&#24403;&#20316;&#27963;&#36291;&#30340;&#25191;&#34892;&#32447;&#31243;&#65292;&#20174;&#32780;&#21487;&#32467;&#21512;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#33509; jthread &#23545;&#35937;&#26631;&#35782;&#27963;&#36291;&#30340;&#25191;&#34892;&#32447;&#31243;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> &#65292;&#21542;&#21017;&#20026; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;thread&gt;</span>
<span class="co2">#include &lt;chrono&gt;</span>
<span class="kw4">void</span> foo<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-thread-sleep_for.html"><span class="kw2149">std::<span class="me2">this_thread</span><span class="sy4">::</span><span class="me2">sleep_for</span></span></a><span class="br0">(</span><a href="cpp-chrono-duration.html"><span class="kw997">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">seconds</span></span></a><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
std<span class="sy4">::</span><span class="me2">jthread</span> t<span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;before starting, joinable: &quot;</span> <span class="sy1">&lt;&lt;</span> <a href="cpp-io-manip-boolalpha.html"><span class="kw1764">std::<span class="me2">boolalpha</span></span></a> <span class="sy1">&lt;&lt;</span> t.<span class="me1">joinable</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
t <span class="sy1">=</span> <a href="cpp-thread-thread.html"><span class="kw2146">std::<span class="me2">thread</span></span></a><span class="br0">(</span>foo<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;after starting, joinable: &quot;</span> <span class="sy1">&lt;&lt;</span> t.<span class="me1">joinable</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
t.<span class="me1">join</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;after joining, joinable: &quot;</span> <span class="sy1">&lt;&lt;</span> t.<span class="me1">joinable</span><span class="br0">(</span><span class="br0">)</span>
<span class="sy1">&lt;&lt;</span> <span class="st0">&#39;<span class="es1">\n</span>&#39;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">before starting, joinable: false
after starting, joinable: true
after joining, joinable: false</pre></div>
</div>
</div>
<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">&#24341;&#29992;</span></h3>
<div class="t-ref-std-c++20">
<ul>
<li>C++20 &#26631;&#20934;&#65288;ISO/IEC 14882:2020&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>32.4.3.2 Members [thread.jthread.mem]</li>
</ul>
</dd>
</dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-thread-jthread-get_id.html"><span class="t-lines"><span>get_id</span></span></a></div>
</div>
</td>
<td>&#36820;&#22238;&#32447;&#31243;&#30340; <i>id</i><br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-thread-jthread-join.html"><span class="t-lines"><span>join</span></span></a></div>
</div>
</td>
<td>&#31561;&#24453;&#32447;&#31243;&#23436;&#25104;&#20854;&#25191;&#34892;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-thread-jthread-detach.html"><span class="t-lines"><span>detach</span></span></a></div>
</div>
</td>
<td>&#23481;&#35768;&#32447;&#31243;&#20174;&#32447;&#31243;&#21477;&#26564;&#29420;&#31435;&#24320;&#26469;&#25191;&#34892;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
</tr>
</table>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>
Reference in New Issue View Git Blame Copy Permalink