Question

Using iOS 5.X
Cpp 11
Xcode

I am trying to identify what is causing this error.
It may be caused from destructor being called prior to a thread completing.

// default_delete


template <class _Tp>
struct _LIBCPP_VISIBLE default_delete
{
    _LIBCPP_INLINE_VISIBILITY default_delete() _NOEXCEPT {}
    template <class _Up>
    _LIBCPP_INLINE_VISIBILITY default_delete(const default_delete<_Up>&,
         typename enable_if<is_convertible<_Up*, _Tp*>::value>::type* = 0) _NOEXCEPT {}
    _LIBCPP_INLINE_VISIBILITY void operator() (_Tp* __ptr) const _NOEXCEPT
    {
        static_assert(sizeof(_Tp) > 0, "default_delete can not delete incomplete type"); 
        delete __ptr;
    }
};


The stack trace is as follows:

stack trace


2013-01-28 13:50:33.704 CPP11AudioRecoClient[4633:5107] A task has completed. Map now contains 0 entries.
terminate called without an active exception(gdb) bt

#0  0x316e932c in __pthread_kill
#1  0x33de620e in pthread_kill 
#2  0x33ddf29e in abort 
#3  0x36c6cf6a in abort_message 
#4  0x36c6a35a in default_terminate
#5  0x35237324 in _objc_terminate
#6  0x31997c96 in std::terminate
#7  0x319d3d18 in std::__1::thread::~thread ()
#8  0x00076cce in std::__1::default_delete<std::__1::thread>::operator() () at /Volumes/Xcode/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/memory:2512

#9  0x319d3d18 in std::__1::thread::~thread ()
#10 0x319d3d18 in std::__1::thread::~thread ()
#11 0x319c94cc in std::__1::__shared_weak_count::__release_shared ()
#12 0x00077606 in std::__1::shared_ptr<std::__1::thread>::~shared_ptr (this=0x2d64c4) at memory:4441
#13 0x0007676c in std::__1::shared_ptr<std::__1::thread>::~shared_ptr (this=0x2d64c4) at memory:4439
#14 0x00076038 in Microsoft::BingMobile::MusicReco::ClientSDK::Cpp11Thread::~Cpp11Thread (this=0x2d64c0) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/Cpp11ThreadFactory.cpp:125
#15 0x00075ffc in Microsoft::BingMobile::MusicReco::ClientSDK::Cpp11Thread::~Cpp11Thread (this=0x2d64c0) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/Cpp11ThreadFactory.cpp:123
#16 0x00075fdc in Microsoft::BingMobile::MusicReco::ClientSDK::Cpp11Thread::~Cpp11Thread (this=0x2d64c0) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/Cpp11ThreadFactory.cpp:123
#17 0x00077f68 in std::__1::default_delete<Microsoft::BingMobile::MusicReco::ClientSDK::Cpp11Thread>::operator() () at /Volumes/Xcode/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/memory:2512
#18 0x00077f68 in std::__1::__shared_ptr_pointer<Microsoft::BingMobile::MusicReco::ClientSDK::Cpp11Thread*, std::__1::default_delete<Microsoft::BingMobile::MusicReco::ClientSDK::Cpp11Thread>, std::__1::allocator<Microsoft::BingMobile::MusicReco::ClientSDK::Cpp11Thread> >::__on_zero_shared (this=0x2d5280) at memory:3668
#19 0x319c94cc in std::__1::__shared_weak_count::__release_shared ()
#20 0x0006a86e in std::__1::shared_ptr<Microsoft::BingMobile::MusicReco::ClientSDK::IThread>::~shared_ptr (this=0x2d6478) at memory:4441
#21 0x00069d94 in std::__1::shared_ptr<Microsoft::BingMobile::MusicReco::ClientSDK::IThread>::~shared_ptr (this=0x2d6478) at memory:4439
#22 0x00068d56 in Microsoft::BingMobile::MusicReco::ClientSDK::AsyncTask::~AsyncTask (this=0x2d6460) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/AsyncTask.cpp:34
#23 0x00068ce8 in Microsoft::BingMobile::MusicReco::ClientSDK::AsyncTask::~AsyncTask (this=0x2d6460) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/AsyncTask.cpp:33
#24 0x00068cc8 in Microsoft::BingMobile::MusicReco::ClientSDK::AsyncTask::~AsyncTask (this=0x2d6460) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/AsyncTask.cpp:33
#25 0x0006ad08 in std::__1::default_delete<Microsoft::BingMobile::MusicReco::ClientSDK::AsyncTask>::operator() () at /Volumes/Xcode/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/memory:2512
#26 0x0006ad08 in std::__1::__shared_ptr_pointer<Microsoft::BingMobile::MusicReco::ClientSDK::AsyncTask*, std::__1::default_delete<Microsoft::BingMobile::MusicReco::ClientSDK::AsyncTask>, std::__1::allocator<Microsoft::BingMobile::MusicReco::ClientSDK::AsyncTask> >::__on_zero_shared (this=0x2d6090) at memory:3668
#27 0x319c94cc in std::__1::__shared_weak_count::__release_shared ()
#28 0x00069fca in std::__1::shared_ptr<Microsoft::BingMobile::MusicReco::ClientSDK::ITaskObserver>::~shared_ptr (this=0x44fb4fc) at memory:4441
#29 0x00069e6c in std::__1::shared_ptr<Microsoft::BingMobile::MusicReco::ClientSDK::ITaskObserver>::~shared_ptr (this=0x44fb4fc) at memory:4439
#30 0x00099c22 in Microsoft::BingMobile::MusicReco::ClientSDK::RunnableTaskBase::notifyObserver (this=0x2d6350, observerWeak=<value temporarily unavailable, due to optimizations>, sharedReferenceToSelf=@0x44fb638) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/RunnableTaskBase.cpp:100
#31 0x00099930 in Microsoft::BingMobile::MusicReco::ClientSDK::RunnableTaskBase::notifyObservers (this=0x2d6350, sharedReferenceToSelf=<value temporarily unavailable, due to optimizations>) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/RunnableTaskBase.cpp:79
#32 0x000996e0 in Microsoft::BingMobile::MusicReco::ClientSDK::RunnableTaskBase::setStatus (this=0x2d6350, targetStatus=Microsoft::BingMobile::MusicReco::ClientSDK::Completed, sharedReferenceToSelf=@0x44fbd20) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/RunnableTaskBase.cpp:107
#33 0x00087168 in Microsoft::BingMobile::MusicReco::ClientSDK::PingWebServiceTask::runTaskChecked (this=0x2d6350, sharedReferenceToSelf=<value temporarily unavailable, due to optimizations>) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/PingWebServiceTask.cpp:120
#34 0x00099356 in Microsoft::BingMobile::MusicReco::ClientSDK::RunnableTaskBase::runTask (this=0x2d6350) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/RunnableTaskBase.cpp:60
#35 0x000991d2 in Microsoft::BingMobile::MusicReco::ClientSDK::RunnableTaskBase::run (this=0x2d6350, sharedReferenceToSelf=<value temporarily unavailable, due to optimizations>) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/RunnableTaskBase.cpp:48
#36 0x00099250 in non-virtual thunk to Microsoft::BingMobile::MusicReco::ClientSDK::RunnableTaskBase::run(std::__1::shared_ptr<Microsoft::BingMobile::MusicReco::ClientSDK::IRunnable>) () at memory:4023
#37 0x000759ca in Microsoft::BingMobile::MusicReco::ClientSDK::RunHookedRunnable::run (this=0x2d64a0, sharedReferenceToSelf=@0x44fcea8) at /Users/v-mattkn/Desktop/CPP11AudioRecoClient/Cpp11ThreadFactory.cpp:75
#38 0x0007736e in _ZNKSt3__110unique_ptrINS_5tupleIJMN9Microsoft10BingMobile9MusicReco9ClientSDK9IRunnableEFvNS_10shared_ptrIS6_EEES8_S8_EEENS_14default_deleteISB_EEEdeEv [inlined] () at /Volumes/Xcode/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1/memory:309
#39 0x0007736e in _ZNSt3__114__thread_proxyINS_5tupleIJMN9Microsoft10BingMobile9MusicReco9ClientSDK9IRunnableEFvNS_10shared_ptrIS6_EEES8_S8_EEEEEPvSC_ (__vp=0x2d6230) at __functional_base:340

40 0x33da7734 in _pthread_start ()

												

Answer 1

That thread::~thread() in the backtrace suggests that the thread is still running when it’s object gets destroyed. That’s an error; you have to call join() or detach() on the thread object before destroying it.