Hei Chan <structurechart@xxxxxxxxx> writes: > I am still on 4.1.2 (which defaults to use C98), and I wonder whether g++ 4.1.2 guarantees that everything happens before (e.g. write to a variable) will be reflected in another thread if: > 1. there is no lock (e.g. pthread_mutex/spinlock) involving > 2. the "another thread" is created (e.g. calling pthread_create) after the "write" The relevant question for the compiler is whether it will issue all writes to globally visible memory before calling pthread_create. The answer is: yes, it will. The rest is up to your library. I would expect that any pthread library would have a memory barrier during pthread_create, in which case you should be fine. Ian
