Thread local storage constructor g++

Question

As non trivial thread local storage variables have an overhead, I would like to use the __attribute__((constructor)) indication on some function in order to initialize thread local data ( being intended that the function will be called each time a thread starts ). Is that some how possible ?

Answer 1

You cannot use __attribute__((constructor)) in that manner. There is no option to designate a function to be called by TLS automatically each time a new thread starts. You will have to code it manually using lazy initialization instead.