111 lines
6.1 KiB
HTML
111 lines
6.1 KiB
HTML
<!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::shared_lock<Mutex>::try_lock</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_shared_lock_try_lock skin-cppreference2 action-view 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::shared_lock<Mutex>::</span>try_lock</h1>
|
|
<div id="bodyContent">
|
|
<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-thread.html">thread</a>‎ | <a href="cpp-thread-shared_lock.html">shared lock</a></span></div>
|
|
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
|
|
<table class="t-dcl-begin">
|
|
<tbody>
|
|
<tr class="t-dcl t-since-cxx14">
|
|
<td>
|
|
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span> try_lock<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
|
|
</td>
|
|
<td class="t-dcl-nopad"></td>
|
|
<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span></td>
|
|
</tr>
|
|
<tr class="t-dcl-sep">
|
|
<td></td>
|
|
<td></td>
|
|
<td></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>尝试以共享模式锁定关联互斥而不阻塞。等效于调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">mutex<span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">></span>try_lock_shared<span class="br0">(</span><span class="br0">)</span></span></span> 。</p>
|
|
<p>若无关联互斥，或互斥已被锁定，则抛出 <span class="t-lc"><a href="cpp-error-system_error.html">std::system_error</a></span> 。</p>
|
|
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
|
|
<p>（无）</p>
|
|
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
|
|
<p>若已成功得到互斥的所有权则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，否则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 。</p>
|
|
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
|
|
<ul>
|
|
<li>任何 <span class="t-c"><span class="mw-geshi cpp source-cpp">mutex<span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">></span>try_lock_shared<span class="br0">(</span><span class="br0">)</span></span></span> 所抛的异常</li>
|
|
</ul>
|
|
<ul>
|
|
<li>若无关联互斥，则抛出以 <span class="t-lc"><a href="cpp-error-errc.html">std::errc::operation_not_permitted</a></span> 为错误码的 <span class="t-lc"><a href="cpp-error-system_error.html">std::system_error</a></span></li>
|
|
</ul>
|
|
<ul>
|
|
<li>若互斥已被锁，则抛出以 <span class="t-lc"><a href="cpp-error-errc.html">std::errc::resource_deadlock_would_occur</a></span> 为错误码的 <span class="t-lc"><a href="cpp-error-system_error.html">std::system_error</a></span></li>
|
|
</ul>
|
|
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
|
|
<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
|
|
<tr>
|
|
<td class="mbox-empty-cell"></td>
|
|
<td class="mbox-text" style="">本节未完成<br />
|
|
原因：暂无示例</td>
|
|
</tr>
|
|
</table>
|
|
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
|
|
<table class="t-dsc-begin">
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><strong class="selflink"><span class="t-lines"><span>try_lock</span></span></strong></div>
|
|
</div>
|
|
</td>
|
|
<td>尝试锁定关联的互斥<br />
|
|
<span class="t-mark">(公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-shared_lock-lock.html"><span class="t-lines"><span>lock</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>锁定关联的互斥<br />
|
|
<span class="t-mark">(公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-shared_lock-try_lock_for.html"><span class="t-lines"><span>try_lock_for</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>尝试锁定关联的互斥，以指定时长<br />
|
|
<span class="t-mark">(公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-shared_lock-try_lock_until.html"><span class="t-lines"><span>try_lock_until</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>尝试锁定关联的互斥，直至指定的时间点<br />
|
|
<span class="t-mark">(公开成员函数)</span></td>
|
|
</tr>
|
|
<tr class="t-dsc">
|
|
<td>
|
|
<div class="t-dsc-member-div">
|
|
<div><a href="cpp-thread-shared_lock-unlock.html"><span class="t-lines"><span>unlock</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>解锁关联的互斥<br />
|
|
<span class="t-mark">(公开成员函数)</span></td>
|
|
</tr>
|
|
</table>
|
|
</div>
|
|
<div class="visualClear"></div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|