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AsyncTasking.html

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 <a href="Cookbook.html">Cookbook</a> &raquo;
 Asynchronous Tasking
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 <h3>Contents</h3>
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 <li><a href="#LaunchAsynchronousTasksFromAnExecutor">Launch Asynchronous Tasks from an Executor</a></li>
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This chapters discusses how to launch tasks asynchronously so that you can incorporate independent, dynamic parallelism in your taskflows.<section id="LaunchAsynchronousTasksFromAnExecutor"><h2><a href="#LaunchAsynchronousTasksFromAnExecutor">Launch Asynchronous Tasks from an Executor</a></h2>Taskflow executor provides an STL-styled method, <a href="classtf_1_1Executor.html#af960048056f7c6b5bc71f4f526f05df7" class="m-doc">tf::Executor::async</a>, for you to run a callable object asynchronously. The method returns a <a href="https://en.cppreference.com/w/cpp/thread/future">std::future</a> that will eventually hold the result of that function call.<pre class="m-code">std::future&lt;int&gt; future = executor.async([](){ return 1; });
assert(future.get() == 1);</pre><aside class="m-note m-warning"><h4>Attention</h4>Unlike <a href="http://en.cppreference.com/w/cpp/thread/async.html" class="m-doc-external">std::async</a>, the future object returned from <a href="classtf_1_1Executor.html#af960048056f7c6b5bc71f4f526f05df7" class="m-doc">tf::Executor::async</a> does not block on destruction until completing the function.</aside>If you do not need the return value or use a future to synchronize the execution, you are encouraged to use <a href="classtf_1_1Executor.html#a0461cb2c459c9f9473c72af06af9c701" class="m-doc">tf::Executor::silent_async</a> which returns nothing and thus has less overhead (i.e., no shared state management) compared to <a href="classtf_1_1Executor.html#af960048056f7c6b5bc71f4f526f05df7" class="m-doc">tf::Executor::async</a>.<pre class="m-code">executor.silent_async([](){
 // do some work without returning any result
});</pre>Launching asynchronous tasks from an executor is thread-safe and can be called by multiple threads both inside (i.e., worker) and outside the executor. Our scheduler autonomously detects whether an asynchronous task is submitted from an external thread or a worker thread and schedules its execution using work stealing.<pre class="m-code">tf::Task my_task = taskflow.emplace([&amp;](){
 // launch an asynchronous task from my_task
 executor.async([&amp;](){
 // launch another asynchronous task that may be run by another worker
 executor.async([&amp;](){});
 })
});
executor.run(taskflow);
executor.wait_for_all(); // wait for all tasks to finish</pre><aside class="m-note m-warning"><h4>Attention</h4>Asynchronous tasks created from an executor does not belong to any taskflows. The lifetime of an asynchronous task is managed automatically by the executor that creates the task.</aside>You can name an asynchronous task using the overloads, tf::Executor::async(const std::string&amp; name, F&amp;&amp; f) and tf::Executor::silent_async(const std::string&amp; name, F&amp;&amp; f), that take a string in the first argument. Assigned names will appear in the observers of the executor.<pre class="m-code">std::future&lt;void&gt; fu = executor.async(&quot;async task&quot;, [](){});
executor.silent_async(&quot;silent async task&quot;, [](){});</pre></section><section id="LaunchAsynchronousTasksFromARuntime"><h2><a href="#LaunchAsynchronousTasksFromARuntime">Launch Asynchronous Tasks from a Runtime</a></h2>You can launch asynchronous tasks from <a href="classtf_1_1Runtime.html" class="m-doc">tf::Runtime</a> using <a href="classtf_1_1Runtime.html#a5688b13034f179c4a8b2b0ebbb215051" class="m-doc">tf::Runtime::async</a> or <a href="classtf_1_1Runtime.html#a0ce29efa2106c8c5a1432e4a55ab2e05" class="m-doc">tf::Runtime::silent_async</a>. The following code creates 100 asynchronous tasks from a runtime and joins their executions explicitly using <a href="classtf_1_1Runtime.html#afcc18484a95fd2a834940d878eaf4dfc" class="m-doc">tf::Runtime::corun_all</a>.<pre class="m-code">tf::Taskflow taskflow;
tf::Executor executor;

std::atomic&lt;int&gt; counter{0};

taskflow.emplace([&amp;] (tf::Runtime&amp; rt){
 // spawn 100 asynchronous tasks and join
 for(int i=0; i&lt;100; i++) {
 rt.silent_async([&amp;](){ ++counter; }));
 }
 rt.corun_all(); // all of the 100 asynchronous tasks will finish by this join
 assert(counter == 100);
 
 // spawn another 100 asynchronous tasks and join
 for(int i=0; i&lt;100; i++) {
 rt.silent_async([&amp;](){ ++counter; }));
 }
 rt.corun_all(); // all of the 100 asynchronous tasks will finish by this join
 assert(counter == 200);
});
executor.run(taskflow).wait();</pre>By default, <a href="classtf_1_1Runtime.html" class="m-doc">tf::Runtime</a> does not join like <a href="classtf_1_1Subflow.html" class="m-doc">tf::Subflow</a>. All pending asynchronous tasks spawned by <a href="classtf_1_1Runtime.html" class="m-doc">tf::Runtime</a> are no longer controllable when their parent runtime disappears. It is your responsibility to properly synchronize spawned asynchronous tasks using <a href="classtf_1_1Runtime.html#afcc18484a95fd2a834940d878eaf4dfc" class="m-doc">tf::Runtime::corun_all</a>.<aside class="m-note m-warning"><h4>Attention</h4>Creating asynchronous tasks from a runtime allows users to efficiently implement parallel algorithms using recursion, such as parallel sort (<a href="classtf_1_1FlowBuilder.html#a35e180eb63de6c9f28e43185e837a4fa" class="m-doc">tf::Taskflow::sort</a>), that demands dynamic parallelism at runtime.</aside></section>
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Tsung-Wei Huang 提交于 2025年01月07日 07:47 +08:00 . updated reduce_by_index

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<p>This chapters discusses how to launch tasks asynchronously so that you can incorporate independent, dynamic parallelism in your taskflows.</p><section id="LaunchAsynchronousTasksFromAnExecutor"><h2><a href="#LaunchAsynchronousTasksFromAnExecutor">Launch Asynchronous Tasks from an Executor</a></h2><p>Taskflow executor provides an STL-styled method, <a href="classtf_1_1Executor.html#af960048056f7c6b5bc71f4f526f05df7" class="m-doc">tf::<wbr />Executor::<wbr />async</a>, for you to run a callable object asynchronously. The method returns a <a href="https://en.cppreference.com/w/cpp/thread/future">std::<wbr />future</a> that will eventually hold the result of that function call.</p><pre class="m-code"><span class="n">std</span><span class="o">::</span><span class="n">future</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span><span class="w"> </span><span class="n">future</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">executor</span><span class="p">.</span><span class="n">async</span><span class="p">([](){</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span><span class="w"> </span><span class="p">});</span>
<span class="n">assert</span><span class="p">(</span><span class="n">future</span><span class="p">.</span><span class="n">get</span><span class="p">()</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">1</span><span class="p">);</span></pre><aside class="m-note m-warning"><h4>Attention</h4><p>Unlike <a href="http://en.cppreference.com/w/cpp/thread/async.html" class="m-doc-external">std::<wbr />async</a>, the future object returned from <a href="classtf_1_1Executor.html#af960048056f7c6b5bc71f4f526f05df7" class="m-doc">tf::<wbr />Executor::<wbr />async</a> does not block on destruction until completing the function.</p></aside><p>If you do not need the return value or use a future to synchronize the execution, you are encouraged to use <a href="classtf_1_1Executor.html#a0461cb2c459c9f9473c72af06af9c701" class="m-doc">tf::<wbr />Executor::<wbr />silent_async</a> which returns nothing and thus has less overhead (i.e., no shared state management) compared to <a href="classtf_1_1Executor.html#af960048056f7c6b5bc71f4f526f05df7" class="m-doc">tf::<wbr />Executor::<wbr />async</a>.</p><pre class="m-code"><span class="n">executor</span><span class="p">.</span><span class="n">silent_async</span><span class="p">([](){</span>
<span class="w"> </span><span class="c1">// do some work without returning any result</span>
<span class="p">});</span></pre><p>Launching asynchronous tasks from an executor is <em>thread-safe</em> and can be called by multiple threads both inside (i.e., worker) and outside the executor. Our scheduler autonomously detects whether an asynchronous task is submitted from an external thread or a worker thread and schedules its execution using work stealing.</p><pre class="m-code"><span class="n">tf</span><span class="o">::</span><span class="n">Task</span><span class="w"> </span><span class="n">my_task</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">taskflow</span><span class="p">.</span><span class="n">emplace</span><span class="p">([</span><span class="o">&amp;</span><span class="p">](){</span>
<span class="w"> </span><span class="c1">// launch an asynchronous task from my_task</span>
<span class="w"> </span><span class="n">executor</span><span class="p">.</span><span class="n">async</span><span class="p">([</span><span class="o">&amp;</span><span class="p">](){</span>
<span class="w"> </span><span class="c1">// launch another asynchronous task that may be run by another worker</span>
<span class="w"> </span><span class="n">executor</span><span class="p">.</span><span class="n">async</span><span class="p">([</span><span class="o">&amp;</span><span class="p">](){});</span>
<span class="w"> </span><span class="p">})</span>
<span class="p">});</span>
<span class="n">executor</span><span class="p">.</span><span class="n">run</span><span class="p">(</span><span class="n">taskflow</span><span class="p">);</span>
<span class="n">executor</span><span class="p">.</span><span class="n">wait_for_all</span><span class="p">();</span><span class="w"> </span><span class="c1">// wait for all tasks to finish</span></pre><aside class="m-note m-warning"><h4>Attention</h4><p>Asynchronous tasks created from an executor does not belong to any taskflows. The lifetime of an asynchronous task is managed automatically by the executor that creates the task.</p></aside><p>You can name an asynchronous task using the overloads, tf::Executor::async(const std::string&amp; name, F&amp;&amp; f) and tf::Executor::silent_async(const std::string&amp; name, F&amp;&amp; f), that take a string in the first argument. Assigned names will appear in the observers of the executor.</p><pre class="m-code"><span class="n">std</span><span class="o">::</span><span class="n">future</span><span class="o">&lt;</span><span class="kt">void</span><span class="o">&gt;</span><span class="w"> </span><span class="n">fu</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">executor</span><span class="p">.</span><span class="n">async</span><span class="p">(</span><span class="s">&quot;async task&quot;</span><span class="p">,</span><span class="w"> </span><span class="p">[](){});</span>
<span class="n">executor</span><span class="p">.</span><span class="n">silent_async</span><span class="p">(</span><span class="s">&quot;silent async task&quot;</span><span class="p">,</span><span class="w"> </span><span class="p">[](){});</span></pre></section><section id="LaunchAsynchronousTasksFromARuntime"><h2><a href="#LaunchAsynchronousTasksFromARuntime">Launch Asynchronous Tasks from a Runtime</a></h2><p>You can launch asynchronous tasks from <a href="classtf_1_1Runtime.html" class="m-doc">tf::<wbr />Runtime</a> using <a href="classtf_1_1Runtime.html#a5688b13034f179c4a8b2b0ebbb215051" class="m-doc">tf::<wbr />Runtime::<wbr />async</a> or <a href="classtf_1_1Runtime.html#a0ce29efa2106c8c5a1432e4a55ab2e05" class="m-doc">tf::<wbr />Runtime::<wbr />silent_async</a>. The following code creates 100 asynchronous tasks from a runtime and joins their executions explicitly using <a href="classtf_1_1Runtime.html#afcc18484a95fd2a834940d878eaf4dfc" class="m-doc">tf::<wbr />Runtime::<wbr />corun_all</a>.</p><pre class="m-code"><span class="n">tf</span><span class="o">::</span><span class="n">Taskflow</span><span class="w"> </span><span class="n">taskflow</span><span class="p">;</span>
<span class="n">tf</span><span class="o">::</span><span class="n">Executor</span><span class="w"> </span><span class="n">executor</span><span class="p">;</span>

<span class="n">std</span><span class="o">::</span><span class="n">atomic</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span><span class="w"> </span><span class="n">counter</span><span class="p">{</span><span class="mi">0</span><span class="p">};</span>

<span class="n">taskflow</span><span class="p">.</span><span class="n">emplace</span><span class="p">([</span><span class="o">&amp;</span><span class="p">]</span><span class="w"> </span><span class="p">(</span><span class="n">tf</span><span class="o">::</span><span class="n">Runtime</span><span class="o">&amp;</span><span class="w"> </span><span class="n">rt</span><span class="p">){</span>
<span class="w"> </span><span class="k">for</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">i</span><span class="o">=</span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">&lt;</span><span class="mi">100</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">++</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">rt</span><span class="p">.</span><span class="n">silent_async</span><span class="p">([</span><span class="o">&amp;</span><span class="p">](){</span><span class="w"> </span><span class="o">++</span><span class="n">counter</span><span class="p">;</span><span class="w"> </span><span class="p">}));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n">rt</span><span class="p">.</span><span class="n">corun_all</span><span class="p">();</span><span class="w"> </span><span class="c1">// all of the 100 asynchronous tasks will finish by this join</span>
<span class="w"> </span><span class="n">assert</span><span class="p">(</span><span class="n">counter</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">100</span><span class="p">);</span>
<span class="p">});</span>
<span class="n">executor</span><span class="p">.</span><span class="n">run</span><span class="p">(</span><span class="n">taskflow</span><span class="p">).</span><span class="n">wait</span><span class="p">();</span></pre><p>Unlike <a href="classtf_1_1Subflow.html#a59fcac1323e70d920088dd37bd0be245" class="m-doc">tf::<wbr />Subflow::<wbr />join</a>, you can call <a href="classtf_1_1Runtime.html#afcc18484a95fd2a834940d878eaf4dfc" class="m-doc">tf::<wbr />Runtime::<wbr />corun_all</a> multiple times to synchronize the execution of asynchronous tasks between different runs. For example, the following code spawn 100 asynchronous tasks twice and join each execution to assure the spawned 100 asynchronous tasks have properly completed.</p><pre class="m-code"><span class="n">tf</span><span class="o">::</span><span class="n">Taskflow</span><span class="w"> </span><span class="n">taskflow</span><span class="p">;</span>
<span class="n">tf</span><span class="o">::</span><span class="n">Executor</span><span class="w"> </span><span class="n">executor</span><span class="p">;</span>

<span class="n">std</span><span class="o">::</span><span class="n">atomic</span><span class="o">&lt;</span><span class="kt">int</span><span class="o">&gt;</span><span class="w"> </span><span class="n">counter</span><span class="p">{</span><span class="mi">0</span><span class="p">};</span>

<span class="n">taskflow</span><span class="p">.</span><span class="n">emplace</span><span class="p">([</span><span class="o">&amp;</span><span class="p">]</span><span class="w"> </span><span class="p">(</span><span class="n">tf</span><span class="o">::</span><span class="n">Runtime</span><span class="o">&amp;</span><span class="w"> </span><span class="n">rt</span><span class="p">){</span>
<span class="w"> </span><span class="c1">// spawn 100 asynchronous tasks and join</span>
<span class="w"> </span><span class="k">for</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">i</span><span class="o">=</span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">&lt;</span><span class="mi">100</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">++</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">rt</span><span class="p">.</span><span class="n">silent_async</span><span class="p">([</span><span class="o">&amp;</span><span class="p">](){</span><span class="w"> </span><span class="o">++</span><span class="n">counter</span><span class="p">;</span><span class="w"> </span><span class="p">}));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n">rt</span><span class="p">.</span><span class="n">corun_all</span><span class="p">();</span><span class="w"> </span><span class="c1">// all of the 100 asynchronous tasks will finish by this join</span>
<span class="w"> </span><span class="n">assert</span><span class="p">(</span><span class="n">counter</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">100</span><span class="p">);</span>
<span class="w"> </span>
<span class="w"> </span><span class="c1">// spawn another 100 asynchronous tasks and join</span>
<span class="w"> </span><span class="k">for</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">i</span><span class="o">=</span><span class="mi">0</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">&lt;</span><span class="mi">100</span><span class="p">;</span><span class="w"> </span><span class="n">i</span><span class="o">++</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">rt</span><span class="p">.</span><span class="n">silent_async</span><span class="p">([</span><span class="o">&amp;</span><span class="p">](){</span><span class="w"> </span><span class="o">++</span><span class="n">counter</span><span class="p">;</span><span class="w"> </span><span class="p">}));</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n">rt</span><span class="p">.</span><span class="n">corun_all</span><span class="p">();</span><span class="w"> </span><span class="c1">// all of the 100 asynchronous tasks will finish by this join</span>
<span class="w"> </span><span class="n">assert</span><span class="p">(</span><span class="n">counter</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">200</span><span class="p">);</span>
<span class="p">});</span>
<span class="n">executor</span><span class="p">.</span><span class="n">run</span><span class="p">(</span><span class="n">taskflow</span><span class="p">).</span><span class="n">wait</span><span class="p">();</span></pre><p>By default, <a href="classtf_1_1Runtime.html" class="m-doc">tf::<wbr />Runtime</a> does not join like <a href="classtf_1_1Subflow.html" class="m-doc">tf::<wbr />Subflow</a>. All pending asynchronous tasks spawned by <a href="classtf_1_1Runtime.html" class="m-doc">tf::<wbr />Runtime</a> are no longer controllable when their parent runtime disappears. It is your responsibility to properly synchronize spawned asynchronous tasks using <a href="classtf_1_1Runtime.html#afcc18484a95fd2a834940d878eaf4dfc" class="m-doc">tf::<wbr />Runtime::<wbr />corun_all</a>.</p><aside class="m-note m-warning"><h4>Attention</h4><p>Creating asynchronous tasks from a runtime allows users to efficiently implement parallel algorithms using recursion, such as parallel sort (<a href="classtf_1_1FlowBuilder.html#a35e180eb63de6c9f28e43185e837a4fa" class="m-doc">tf::<wbr />Taskflow::<wbr />sort</a>), that demands dynamic parallelism at runtime.</p></aside></section>
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