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<h1 class="page">Timeout with Cancellation</h1>
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Using stop tokens to implement operation timeouts.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_what_you_will_learn"><a class="anchor" href="#_what_you_will_learn"></a>What You Will Learn</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Creating and using <code>std::stop_source</code></p>
</li>
<li>
<p>Checking <code>stop_requested()</code> in coroutines</p>
</li>
<li>
<p>Cancellation patterns</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_prerequisites"><a class="anchor" href="#_prerequisites"></a>Prerequisites</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p>Completed <a href="7e.type-erased-echo.html" class="xref page">Type-Erased Echo</a></p>
</li>
<li>
<p>Understanding of stop tokens from <a href="../4.coroutines/4e.cancellation.html" class="xref page">Cancellation</a></p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_source_code"><a class="anchor" href="#_source_code"></a>Source Code</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">#include &lt;boost/capy.hpp&gt;
#include &lt;boost/capy/test/stream.hpp&gt;
#include &lt;boost/capy/test/run_blocking.hpp&gt;
#include &lt;chrono&gt;
#include &lt;iostream&gt;
#include &lt;latch&gt;
#include &lt;thread&gt;
using namespace boost::capy;
// A slow operation that respects cancellation
task&lt;std::string&gt; slow_fetch(int steps)
{
auto token = co_await this_coro::stop_token; // std::stop_token
std::string result;
for (int i = 0; i &lt; steps; ++i)
{
// Check cancellation before each step
if (token.stop_requested())
{
std::cout &lt;&lt; " Cancelled at step " &lt;&lt; i &lt;&lt; std::endl;
throw std::system_error(
make_error_code(std::errc::operation_canceled));
}
result += "step" + std::to_string(i) + " ";
// Simulate slow work (in real code, this would be I/O)
std::this_thread::sleep_for(std::chrono::milliseconds(10));
std::cout &lt;&lt; " Completed step " &lt;&lt; i &lt;&lt; std::endl;
// Yield to allow stop request to be processed before next check
std::this_thread::sleep_for(std::chrono::milliseconds(15));
}
co_return result;
}
// Run with timeout (conceptual - real implementation needs timer)
task&lt;std::optional&lt;std::string&gt;&gt; fetch_with_timeout()
{
auto token = co_await this_coro::stop_token; // std::stop_token
try
{
auto result = co_await slow_fetch(5); // std::string
co_return result;
}
catch (std::system_error const&amp; e)
{
if (e.code() == std::errc::operation_canceled)
co_return std::nullopt;
throw;
}
}
void demo_normal_completion()
{
std::cout &lt;&lt; "Demo: Normal completion\n";
thread_pool pool;
std::stop_source source;
std::latch done(1); // std::latch - wait for 1 task
run_async(pool.get_executor(), source.get_token(),
[&amp;done](std::optional&lt;std::string&gt; result) {
if (result)
std::cout &lt;&lt; "Result: " &lt;&lt; *result &lt;&lt; "\n";
else
std::cout &lt;&lt; "Cancelled\n";
done.count_down();
},
[&amp;done](std::exception_ptr) { done.count_down(); }
)(fetch_with_timeout());
done.wait(); // Block until task completes
}
void demo_cancellation()
{
std::cout &lt;&lt; "\nDemo: Cancellation after 2 steps\n";
thread_pool pool;
std::stop_source source;
std::latch done(1); // std::latch - wait for 1 task
// Launch the task
run_async(pool.get_executor(), source.get_token(),
[&amp;done](std::optional&lt;std::string&gt; result) {
if (result)
std::cout &lt;&lt; "Result: " &lt;&lt; *result &lt;&lt; "\n";
else
std::cout &lt;&lt; "Cancelled (returned nullopt)\n";
done.count_down();
},
[&amp;done](std::exception_ptr) { done.count_down(); }
)(fetch_with_timeout());
// Simulate timeout: cancel after 2 steps complete
// Timing: each step is 10ms work + 15ms yield = 25ms total
// Stop at 42ms: after step 1 print, before step 2 check
std::this_thread::sleep_for(std::chrono::milliseconds(42));
std::cout &lt;&lt; " Requesting stop..." &lt;&lt; std::endl;
source.request_stop();
done.wait(); // Block until task completes (after cancellation)
}
// Example: Manual stop token checking
task&lt;int&gt; process_items(std::vector&lt;int&gt; const&amp; items)
{
auto token = co_await this_coro::stop_token; // std::stop_token
int sum = 0;
for (auto item : items) // int
{
if (token.stop_requested())
{
std::cout &lt;&lt; "Processing cancelled, partial sum: " &lt;&lt; sum &lt;&lt; "\n";
co_return sum; // Return partial result
}
sum += item;
}
co_return sum;
}
int main()
{
demo_normal_completion();
demo_cancellation();
return 0;
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_build"><a class="anchor" href="#_build"></a>Build</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cmake hljs" data-lang="cmake">add_executable(timeout_cancellation timeout_cancellation.cpp)
target_link_libraries(timeout_cancellation PRIVATE capy)</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_walkthrough"><a class="anchor" href="#_walkthrough"></a>Walkthrough</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_getting_the_stop_token"><a class="anchor" href="#_getting_the_stop_token"></a>Getting the Stop Token</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">auto token = co_await this_coro::stop_token; // std::stop_token</code></pre>
</div>
</div>
<div class="paragraph">
<p>Inside a task, <code>this_coro::stop_token</code> retrieves the stop token propagated from the caller. You can also access it through the full environment via <code>co_await this_coro::environment</code>.</p>
</div>
</div>
<div class="sect2">
<h3 id="_checking_for_cancellation"><a class="anchor" href="#_checking_for_cancellation"></a>Checking for Cancellation</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">if (token.stop_requested())
{
throw std::system_error(make_error_code(std::errc::operation_canceled));
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Check <code>stop_requested()</code> at appropriate points—typically before expensive operations or at loop iterations.</p>
</div>
</div>
<div class="sect2">
<h3 id="_triggering_cancellation"><a class="anchor" href="#_triggering_cancellation"></a>Triggering Cancellation</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">std::stop_source source;
run_async(ex, source.get_token())(my_task());
// Later:
source.request_stop();</code></pre>
</div>
</div>
<div class="paragraph">
<p>The stop source controls the stop token. Calling <code>request_stop()</code> signals all holders of tokens from this source.</p>
</div>
</div>
<div class="sect2">
<h3 id="_partial_results"><a class="anchor" href="#_partial_results"></a>Partial Results</h3>
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-cpp hljs" data-lang="cpp">if (token.stop_requested())
{
co_return partial_result; // Return what we have
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Cancellation doesn&#8217;t have to throw. You can return partial results or a sentinel value.</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_output"><a class="anchor" href="#_output"></a>Output</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-asciidoc hljs" data-lang="asciidoc">Demo: Normal completion
Completed step 0
Completed step 1
Completed step 2
Completed step 3
Completed step 4
Result: step0 step1 step2 step3 step4
Demo: Cancellation after 2 steps
Completed step 0
Completed step 1
Requesting stop...
Cancelled at step 2
Cancelled (returned nullopt)</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_exercises"><a class="anchor" href="#_exercises"></a>Exercises</h2>
<div class="sectionbody">
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Implement a retry-with-timeout pattern</p>
</li>
<li>
<p>Add cancellation support to the echo session from the previous example</p>
</li>
<li>
<p>Create a task that cancels itself after processing N items</p>
</li>
</ol>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_next_steps"><a class="anchor" href="#_next_steps"></a>Next Steps</h2>
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<ul>
<li>
<p><a href="7g.parallel-fetch.html" class="xref page">Parallel Fetch</a> — Concurrent operations with when_all</p>
</li>
</ul>
</div>
</div>
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