John Love-Jensen schrieb:
[...]
Although you didn't ask for work-arounds, here's a work-around that works
for GCC, but may not work in C++ in general*.
GCC uses threading protection for static objects.
So this variant of your routine, in GCC, should be thread safe:
----------------------------------------------------------------------
myclass* myclass::init_instance() // private: static
{
return new myclass();
}
myclass* myclass::get_instance() // public: static
{
static myclass* instance = InitInstance();
return instance;
}
----------------------------------------------------------------------
*GCC* does the threading protection?
I really wonder how!
How can GCC achieve this on every platform (especially embedded targets
such as AVR, H8, ARM) without help from the runtime? (I haven't seen any
dependencies to RTL functions in such case.)
Is this implemented using interruption-transparent algorithms / atomic
operations or does the above simply hold only for some specific platform?
Daniel
