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POC++11 static local variables and threads
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  1. POC++11 static local variables and threads
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    copied!<p>Is static local variables safe for a class that creates/uses <code>std::thread</code>s?</p> <p>Because when I use something like this:</p> <pre><code>logger&amp; logger::get_instance(void) { static logger lg; return lg; } </code></pre> <p>And try to exit (force close) the executable, it crashes/exits improperly (somethings the Visual Studio 2012 debugger even crashes).</p> <p>When I don't do that, the program exits gracefully when i force close.</p> <p>Here's the stack call when it crashes</p> <pre><code> ntdll.dll!77c10dbd() Unknown [Frames below may be incorrect and/or missing, no symbols loaded for ntdll.dll] ntdll.dll!77b7bfdc() Unknown kernel32.dll!75b55bab() Unknown &gt; msvcr110d.dll!__crtCreateThreadpoolWait(void (_TP_CALLBACK_INSTANCE *, void *, _TP_WAIT *, unsigned long) * pfnwa, void * pv, _TP_CALLBACK_ENVIRON_V1 * pcbe) Line 569 C msvcr110d.dll!Concurrency::details::RegisterAsyncWaitAndLoadLibrary(void * waitingEvent, void (_TP_CALLBACK_INSTANCE *, void *, _TP_WAIT *, unsigned long) * callback, void * data) Line 675 C++ msvcr110d.dll!Concurrency::details::ExternalContextBase::PrepareForUse(bool explicitAttach) Line 120 C++ msvcr110d.dll!Concurrency::details::ExternalContextBase::ExternalContextBase(Concurrency::details::SchedulerBase * pScheduler, bool explicitAttach) Line 52 C++ msvcr110d.dll!Concurrency::details::SchedulerBase::GetExternalContext(bool explicitAttach) Line 1579 C++ msvcr110d.dll!Concurrency::details::SchedulerBase::AttachExternalContext(bool explicitAttach) Line 1527 C++ msvcr110d.dll!Concurrency::details::SchedulerBase::CreateContextFromDefaultScheduler() Line 569 C++ msvcr110d.dll!Concurrency::details::SchedulerBase::CurrentContext() Line 402 C++ msvcr110d.dll!Concurrency::details::LockQueueNode::LockQueueNode(unsigned int timeout) Line 616 C++ msvcr110d.dll!Concurrency::critical_section::lock() Line 1017 C++ msvcp110d.dll!mtx_do_lock(_Mtx_internal_imp_t * * mtx, const xtime * target) Line 65 C++ msvcp110d.dll!_Mtx_lock(_Mtx_internal_imp_t * * mtx) Line 144 C++ escobar.exe!std::_Mtx_lockX(_Mtx_internal_imp_t * * _Mtx) Line 68 C++ escobar.exe!std::_Mutex_base::lock() Line 43 C++ escobar.exe!std::unique_lock&lt;std::mutex&gt;::unique_lock&lt;std::mutex&gt;(std::mutex &amp; _Mtx) Line 228 C++ escobar.exe!escobar::utilities::blocking_queue&lt;escobar::logging::log_message *&gt;::interrupt() Line 71 C++ escobar.exe!escobar::logging::log_worker::~log_worker() Line 17 C++ escobar.exe!escobar::logging::log_worker::`scalar deleting destructor'(unsigned int) C++ escobar.exe!escobar::logging::logger::close() Line 72 C++ escobar.exe!escobar::logging::logger::~logger() Line 27 C++ escobar.exe!`escobar::logging::logger::get_instance'::`2'::`dynamic atexit destructor for 'lg''() C++ msvcr110d.dll!doexit(int code, int quick, int retcaller) Line 585 C msvcr110d.dll!_cexit() Line 410 C msvcr110d.dll!__CRTDLL_INIT(void * hDllHandle, unsigned long dwReason, void * lpreserved) Line 296 C msvcr110d.dll!_CRTDLL_INIT(void * hDllHandle, unsigned long dwReason, void * lpreserved) Line 210 C ntdll.dll!77bb2846() Unknown ntdll.dll!77bb2893() Unknown ntdll.dll!77bc09c8() Unknown ntdll.dll!77bc08ad() Unknown KernelBase.dll!75525bbb() Unknown KernelBase.dll!75525c51() Unknown kernel32.dll!75b58543() Unknown ntdll.dll!77bbac69() Unknown ntdll.dll!77bbac3c() Unknown </code></pre> <p>Here are a couple of the functoin</p> <pre><code>log_worker::~log_worker(void) { this-&gt;queue.interrupt(); service.join(); } void log_worker::run(void) { while (true) { log_message* msg; if (this-&gt;queue.dequeue(msg) == false) break; this-&gt;lg-&gt;print_log_message(msg); delete msg; } } bool dequeue(T&amp; item) { std::unique_lock&lt;std::mutex&gt; lock(m); // handles spurious wakeups while (!this-&gt;data_available &amp;&amp; !this-&gt;interrupted) cv.wait(lock); if (this-&gt;interrupted) return false; item = std::move(this-&gt;front()); this-&gt;pop(); if (this-&gt;empty()) this-&gt;data_available = false; return true; } void interrupt(void) { std::unique_lock&lt;std::mutex&gt; lock(m); this-&gt;interrupted = true; cv.notify_all(); printf("notified threads...\n"); } </code></pre>
 

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