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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Simple c++ program using lldb hangs in std::condition_variable desctructor when linked with -lpthreads on linux with gcc"
href="http://llvm.org/bugs/show_bug.cgi?id=21553">21553</a>
</td>
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<tr>
<th>Summary</th>
<td>Simple c++ program using lldb hangs in std::condition_variable desctructor when linked with -lpthreads on linux with gcc
</td>
</tr>
<tr>
<th>Product</th>
<td>lldb
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>lldb-dev@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sbest@blueshiftinc.com
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider the following simple stand-alone c++ that does nothing other than
initialize lldb, then use a std::condition_variable.
#include <iostream>
#include <condition_variable>
#include <mutex>
#include "lldb/API/LLDB.h"
int main(int argc, char** argv)
{
lldb::SBDebugger::Initialize();
{
std::condition_variable g_condition;
{
std::mutex g_mutex;
std::unique_lock<std::mutex> lock(g_mutex);
g_condition.wait_for(lock, std::chrono::seconds(1));
std::cout << "going out of scope 1\n";
}
std::cout << "going out of scope 2\n";
}
std::cout << "done\n";
}
When the program is built on Unbuntu 14.04, x86_64 with the following command
line:
g++ hang.cpp -g -O0 -m64 -std=c++11 -Ipath_to_lldb/include
-Lpath_to_lldb_build/lib -llldb -lpthread -o "hang"
Remember to also set environment variable:
export LD_LIBRARY_PATH=path_to_lldb_build/lib
Program hangs after printing "going out of scope 2", and never prints "done".
If I interrupt the hang, it is waiting on a mutex inside the
std::condition_variable destructor.
Remove "-lpthread" from link flags and program works no problem.
std::condition_variable is included by "-std=c++11", but this behavior is
platform dependent.</pre>
</div>
</p>
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