const size_t MAX_SPLITPOINTS_PER_THREAD = 8;
const size_t MAX_SLAVES_PER_SPLITPOINT = 4;
-
-/// Spinlock class wraps low level atomic operations to provide a spin lock
-
class Spinlock {
- Mutex m; // WARNING: Diasabled spinlocks to test on fishtest
+ std::atomic_int lock;
public:
- void acquire() { m.lock(); }
- void release() { m.unlock(); }
+ 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); }
};
std::thread nativeThread;
Mutex mutex;
+ Spinlock spinlock;
ConditionVariable sleepCondition;
volatile bool exit = false;
};
void start_thinking(const Position&, const Search::LimitsType&, Search::StateStackPtr&);
Depth minimumSplitDepth;
- Spinlock spinlock;
ConditionVariable sleepCondition;
TimerThread* timer;
};