Hi All, I was experimenting with the boost.threads library and especially boost::thread_specific_ptr. However, I ran into problems trying to reset the thread_specific_ptr by the this pointer (see the code below). // ========= beginning of code ============= #include <iostream> #include <boost/thread/thread.hpp> #include <boost/thread/mutex.hpp> #include <boost/thread/tss.hpp> boost::mutex mutex_; class A { private: double x_; static boost::thread_specific_ptr ptr_; public: A(double x=0) : x_(x) {} void operator()() { if (0==ptr_.get()) { ptr_.reset(this); } boost::mutex::scoped_lock lock(mutex_); std::cout << "x_=" << x_ << std::endl; } }; boost::thread_specific_ptr A::ptr_; int main() { boost::thread thrd1( A(1) ); boost::thread thrd2( A(2) ); thrd1.join(); thrd2.join(); return 0; } // ======= end of code ========= This compiled fine with boost_1_36 (binary from boostPro) under VC9 with multithreaded debug DLL code generation. But when I ran it under the debug mode, I got the following error message: Debug Assertion Failed. Expression: _BLOCK_TYPE_IS_VALID(pHead->nBlockUse) I searched the web and this seemed to be a memory problem. And I noticed that it failed to call the destructor of thread_specific_ptr. Is my code legal? Or one is not supposed to reset a thread_specific_ptr to this pointer? Your feedback would be greatly appreciated. Pengcheng Song -- View this message in context: http://www.nabble.com/-thread--reset-a-thread_specific_ptr-by-this-pointer-t... Sent from the Boost - Dev mailing list archive at Nabble.com.