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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 --- - std::promise/future deadlock"
href="https://llvm.org/bugs/show_bug.cgi?id=30376">30376</a>
</td>
</tr>
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<th>Summary</th>
<td>std::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>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</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>vrba@mixedrealities.no
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The bug happens with "Apple LLVM 7.0.0" (clang 7) on OSX 10.11.1 (El Capitan)
with XCode 7.0.1. The program below will write out a series of numbers and
after a short while hang, whereas it shouldn't. It runs flawlessly on Linux.
#include <iostream>
#include <thread>
#include <future>
#include <boost/asio.hpp>
using std::cout;
using std::endl;
static boost::asio::io_service io;
static void asio_thread()
{
boost::asio::io_service::work work(io);
cout << "STARTING ASIO" << endl;
io.run();
cout << "STOPPING ASIO" << endl;
}
static int poll()
{
static int n;
std::promise<int> promise;
auto fut = promise.get_future();
io.post([&promise]() {
promise.set_value(n++);
});
return fut.get();
}
int main()
{
std::thread thread(asio_thread);
size_t n = 0;
while (1)
cout << "POLL: " << poll() << "\n";
return 0;
}</pre>
</div>
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