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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - libc++abi should report forced unwinding on thread termination."
href="https://bugs.llvm.org/show_bug.cgi?id=41396">41396</a>
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<th>Summary</th>
<td>libc++abi should report forced unwinding on thread termination.
</td>
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<th>Product</th>
<td>libc++abi
</td>
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<th>Version</th>
<td>7.0
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>eric@efcs.ca
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<p>
<div>
<pre>libstdc++ throws an exception when forced unwinding occurs, for example by a
call to pthread_exit.
This allows the library to detect and avoid certain classes of bugs. For
example, libc++ hangs forever on this test, libstdc++ reports the promise as
broken.
#include <future>
#include <stdexcept>
#include <pthread.h>
#include <cassert>
void f() { pthread_exit(nullptr); }
int main()
{
auto fut = std::async(std::launch::async, f);
try
{
fut.get();
throw std::logic_error("Unreachable");
}
catch (const std::future_error& e)
{
assert( e.code() == std::future_errc::broken_promise );
}
}</pre>
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