http://llvm.org/bugs/show_bug.cgi?id=21553
Bug ID: 21553
Summary: Simple c++ program using lldb hangs in
std::condition_variable desctructor when linked with
-lpthreads on linux with gcc
Product: lldb
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-dev@cs.uiuc.edu
Reporter: sb...@blueshiftinc.com
Classification: Unclassified
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.
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