120 lines
9.9 KiB
HTML
120 lines
9.9 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::packaged_task<R(Args...)>::make_ready_at_thread_exit</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_packaged_task_make_ready_at_thread_exit 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::packaged_task<R(Args...)>::</span>make_ready_at_thread_exit</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-packaged_task.html">packaged task</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-cxx11">
|
|
<td>
|
|
<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> make_ready_at_thread_exit<span class="br0">(</span> ArgTypes... <span class="me1">args</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-cxx11">(C++11 起)</span></td>
|
|
</tr>
|
|
<tr class="t-dcl-sep">
|
|
<td></td>
|
|
<td></td>
|
|
<td></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
<p>以转发的 <code>args</code> 为参数调用存储的任务。任务返回值或任何抛出的异常被存储于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的共享状态。</p>
|
|
<p>仅在当前线程退出，并销毁所有<i>线程局域</i>存储期对象后，才令共享状态就绪。</p>
|
|
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
|
|
<table class="t-par-begin">
|
|
<tr class="t-par">
|
|
<td>args</td>
|
|
<td>-</td>
|
|
<td>调用时传递给存储任务的参数</td>
|
|
</tr>
|
|
</table>
|
|
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
|
|
<p>（无）</p>
|
|
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
|
|
<p>遇到下列条件时为 <span class="t-lc"><a href="cpp-thread-future_error.html">std::future_error</a></span> ：</p>
|
|
<ul>
|
|
<li>已调用存储的任务。设置 error_category 为 <a href="cpp-thread-future_errc.html"><tt>promise_already_satisfied</tt></a> 。</li>
|
|
<li><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 无共享状态。设置 error_category 为 <a href="cpp-thread-future_errc.html"><tt>no_state</tt></a> 。</li>
|
|
</ul>
|
|
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</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 <future></span>
|
|
<span class="co2">#include <iostream></span>
|
|
<span class="co2">#include <chrono></span>
|
|
<span class="co2">#include <thread></span>
|
|
<span class="co2">#include <functional></span>
|
|
<span class="co2">#include <utility></span>
|
|
|
|
<span class="kw4">void</span> worker<span class="br0">(</span><a href="cpp-thread-future.html"><span class="kw2180">std::<span class="me2">future</span></span></a><span class="sy1"><</span><span class="kw4">void</span><span class="sy1">></span><span class="sy3">&</span> output<span class="br0">)</span>
|
|
<span class="br0">{</span>
|
|
<a href="cpp-thread-packaged_task.html"><span class="kw2183">std::<span class="me2">packaged_task</span></span></a><span class="sy1"><</span><span class="kw4">void</span><span class="br0">(</span><span class="kw4">bool</span><span class="sy3">&</span><span class="br0">)</span><span class="sy1">></span> my_task<span class="br0">{</span> <span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">bool</span><span class="sy3">&</span> done<span class="br0">)</span> <span class="br0">{</span> done<span class="sy1">=</span><span class="kw2">true</span><span class="sy4">;</span> <span class="br0">}</span> <span class="br0">}</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">auto</span> result <span class="sy1">=</span> my_task.<span class="me1">get_future</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">bool</span> done <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
|
|
|
|
my_task.<span class="me1">make_ready_at_thread_exit</span><span class="br0">(</span>done<span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 立即执行任务</span>
|
|
|
|
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"worker: done = "</span> <span class="sy1"><<</span> <a href="cpp-io-manip-boolalpha.html"><span class="kw1764">std::<span class="me2">boolalpha</span></span></a> <span class="sy1"><<</span> done <span class="sy1"><<</span> <a href="cpp-io-manip-endl.html"><span class="kw1791">std::<span class="me2">endl</span></span></a><span class="sy4">;</span>
|
|
|
|
<span class="kw4">auto</span> status <span class="sy1">=</span> result.<span class="me1">wait_for</span><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">0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">if</span> <span class="br0">(</span>status <span class="sy1">==</span> <a href="cpp-thread-future_status.html"><span class="kw2190">std::<span class="me2">future_status</span><span class="sy4">::</span><span class="me2">timeout</span></span></a><span class="br0">)</span>
|
|
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"worker: result is not ready yet"</span> <span class="sy1"><<</span> <a href="cpp-io-manip-endl.html"><span class="kw1791">std::<span class="me2">endl</span></span></a><span class="sy4">;</span>
|
|
|
|
output <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>result<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>
|
|
<a href="cpp-thread-future.html"><span class="kw2180">std::<span class="me2">future</span></span></a><span class="sy1"><</span><span class="kw4">void</span><span class="sy1">></span> result<span class="sy4">;</span>
|
|
|
|
<a href="cpp-thread-thread.html"><span class="kw2146">std::<span class="me2">thread</span></span></a><span class="br0">{</span>worker, <a href="cpp-utility-functional-ref.html"><span class="kw1069">std::<span class="me2">ref</span></span></a><span class="br0">(</span>result<span class="br0">)</span><span class="br0">}</span>.<span class="me1">join</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
|
|
|
|
<span class="kw4">auto</span> status <span class="sy1">=</span> result.<span class="me1">wait_for</span><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">0</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
|
|
<span class="kw1">if</span> <span class="br0">(</span>status <span class="sy1">==</span> <a href="cpp-thread-future_status.html"><span class="kw2189">std::<span class="me2">future_status</span><span class="sy4">::</span><span class="me2">ready</span></span></a><span class="br0">)</span>
|
|
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> <span class="st0">"main: result is ready"</span> <span class="sy1"><<</span> <a href="cpp-io-manip-endl.html"><span class="kw1791">std::<span class="me2">endl</span></span></a><span class="sy4">;</span>
|
|
<span class="br0">}</span></pre></div>
|
|
</div>
|
|
<p>输出：</p>
|
|
<div dir="ltr" class="mw-geshi" style="text-align: left;">
|
|
<div class="text source-text">
|
|
<pre class="de1">worker: done = true
|
|
worker: result is not ready yet
|
|
main: result is ready</pre></div>
|
|
</div>
|
|
</div>
|
|
<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><a href="cpp-thread-packaged_task-operator().html"><span class="t-lines"><span>operator()</span></span></a></div>
|
|
</div>
|
|
</td>
|
|
<td>执行函数<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>
|