- std::atomic_int lock;
-
-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)
- for (int cnt = 0; lock.load(std::memory_order_relaxed) <= 0; ++cnt)
- if (cnt >= 10000) std::this_thread::yield(); // Be nice to hyperthreading
- }
- void release() { lock.store(1, std::memory_order_release); }
-};
-
-
-/// SplitPoint struct stores information shared by the threads searching in
-/// parallel below the same split point. It is populated at splitting time.
-
-struct SplitPoint {
-
- // Const data after split point has been setup
- const Position* pos;
- Search::Stack* ss;
- Thread* master;
- Depth depth;
- Value beta;
- int nodeType;
- bool cutNode;
-
- // Const pointers to shared data
- MovePicker* movePicker;
- SplitPoint* parentSplitPoint;
-
- // Shared variable data
- Spinlock spinlock;
- std::bitset<MAX_THREADS> slavesMask;
- volatile bool allSlavesSearching;
- volatile uint64_t nodes;
- volatile Value alpha;
- volatile Value bestValue;
- volatile Move bestMove;
- volatile int moveCount;
- volatile bool cutoff;
-};
-
-
-/// ThreadBase struct is the base of the hierarchy from where we derive all the
-/// specialized thread classes.
-
-struct ThreadBase {
-
- virtual ~ThreadBase() = default;
- virtual void idle_loop() = 0;
- void notify_one();
- void wait_for(volatile const bool& b);
-
- std::thread nativeThread;