I've got an object that should only be called from the thread that instantiated, and I'd like the object to check that. Using pthreads I've checked this with pthread_self, but now I'm moving to boost threads, my code looks like this: class MyClass { boost::thread instantiating_thread; public: void doSomething() { // Verify that we have been called from the right thread assert(boost::thread() == instantiating_thread) // Actually do something... } }; Is this alright? The boost::threads documentation has this to say about the boost::thread() default constructor: 1. thread(); Effects: Constructs a thread object representing the current thread of execution. Postconditions: *this is non-joinable. Notes: Danger:*this is valid only within the current thread. (http://www.boost.org/doc/html/thread.html) If *this is not valid from another thread, as the documentation states, then my assert above is broken, right? Regards, Thomas Søndergaard