const size_t MAX_SLAVES_PER_SPLITPOINT = 4;
class Spinlock {
- std::atomic_int _lock;
+
+ std::atomic_int lock;
public:
- Spinlock() { _lock = 1; } // Init here to workaround a bug with MSVC 2013
- void lock() {
- 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
+ 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)
+ std::this_thread::yield(); // Be nice to hyperthreading
}
- void unlock() { _lock.store(1, std::memory_order_release); }
+ void release() { lock.store(1, std::memory_order_release); }
};
SplitPoint* parentSplitPoint;
// Shared variable data
- Spinlock mutex;
+ Spinlock spinlock;
std::bitset<MAX_THREADS> slavesMask;
volatile bool allSlavesSearching;
volatile uint64_t nodes;
/// ThreadBase struct is the base of the hierarchy from where we derive all the
/// specialized thread classes.
-struct ThreadBase {
+struct ThreadBase : public std::thread {
virtual ~ThreadBase() = default;
virtual void idle_loop() = 0;
void notify_one();
void wait_for(volatile const bool& b);
- std::thread nativeThread;
Mutex mutex;
+ Spinlock spinlock;
ConditionVariable sleepCondition;
volatile bool exit = false;
};
SplitPoint* volatile activeSplitPoint;
volatile size_t splitPointsSize;
volatile bool searching;
- Spinlock allocMutex;
};
struct MainThread : public Thread {
virtual void idle_loop();
+ void join();
volatile bool thinking = true; // Avoid a race with start_thinking()
};
MainThread* main() { return static_cast<MainThread*>(at(0)); }
void read_uci_options();
Thread* available_slave(const SplitPoint* sp) const;
- void wait_for_think_finished();
void start_thinking(const Position&, const Search::LimitsType&, Search::StateStackPtr&);
Depth minimumSplitDepth;
- ConditionVariable sleepCondition;
TimerThread* timer;
};