https://llvm.org/bugs/show_bug.cgi?id=30376
Bug ID: 30376
Summary: std::promise/future deadlock
Product: libc++
Version: unspecified
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: v...@mixedrealities.no
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
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;
}
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