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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - promise/future deadlock"
href="https://llvm.org/bugs/show_bug.cgi?id=24692">24692</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>promise/future deadlock
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>kaballo86@hotmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following test case results in a deadlock:
#include <chrono>
#include <future>
#include <iostream>
#include <utility>
template <typename T>
struct weird {
std::future<weird<T>> f;
explicit weird(std::future<weird<T>> f) : f(std::move(f)) {}
weird(weird&& other)
: f(std::move(other.f))
{
if (f.wait_for(std::chrono::seconds(1)) == std::future_status::timeout)
{
std::cout << "Moving but the future is not ready yet\n";
}
}
};
int main() {
std::promise<weird<int>> p;
weird<int> w(p.get_future());
p.set_value(std::move(w));
}
This is caused by executing arbitrary user code under a lock.</pre>
</div>
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