+public:
+ Spinlock() { lock = 1; } // Init here to workaround a bug with MSVC 2013
+ void acquire() {
+ while (lock.fetch_sub(1, std::memory_order_acquire) != 1)
+ while (lock.load(std::memory_order_relaxed) <= 0) {}
+ }
+ void release() { lock.store(1, std::memory_order_release); }