std::atomic<void*>& get_hazard_pointer_for_current_thread()
{
// The first time each thread calls this function, a new instance of
// hp_owner is created. The constructor for this new instance then
// searchs through the table of owner/pointer pairs looking for an entry
// without an owner. It uses compare_exchange_strong() to check for an
// entry without an owner and claim it in one go.
//
// Once the hp_owner instance has been created for a given thread, further
// accesses are much faster because the pointer is cached, so the table
// doesn't have to be scanned again.
printf("get harzard pointer for current thread, thread id: %d\n", std::this_thread::get_id());
thread_local static hp_owner hazard;
return hazard.get_pointer();
}
std::atomic<void *> &get_hazard_pointer_for_current_thread() {
static hp_owner hazard;
return hazard.get_pointer();
}