Code AnalysisBeginner 60s

DCLP Missing Release Ordering

Find the bug.

Starter code

static std::atomic<Widget*> inst{nullptr};
Widget* get(){
  Widget* p = inst.load(std::memory_order_relaxed);
  if(!p){
    std::lock_guard g(mtx);
    p = inst.load(std::memory_order_relaxed);
    if(!p){ p = new Widget(); inst.store(p, std::memory_order_relaxed); }
  }
  return p;
}

dclp singleton memory-order

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