- while (lock.fetch_sub(1, std::memory_order_acquire) != 1)
- while (lock.load(std::memory_order_relaxed) <= 0) {}
+ while (lock.fetch_sub(1, std::memory_order_acquire) != 1)
+ for (int cnt = 0; lock.load(std::memory_order_relaxed) <= 0; ++cnt)
+ if (cnt >= 10000) std::this_thread::yield(); // Be nice to hyperthreading