#include <cstring>
#include "lock.h"
+#include "material.h"
#include "movepick.h"
+#include "pawns.h"
#include "position.h"
-#include "search.h"
const int MAX_THREADS = 32;
const int MAX_ACTIVE_SPLIT_POINTS = 8;
volatile Value alpha;
volatile Value bestValue;
volatile int moveCount;
- volatile bool betaCutoff;
- volatile int slaves[MAX_THREADS];
+ volatile bool is_betaCutoff;
+ volatile bool is_slave[MAX_THREADS];
};
-// ThreadState type is used to represent thread's current state
-enum ThreadState
-{
- THREAD_INITIALIZING, // thread is initializing itself
- THREAD_SEARCHING, // thread is performing work
- THREAD_AVAILABLE, // thread is waiting for work
- THREAD_BOOKED, // other thread (master) has booked us as a slave
- THREAD_WORKISWAITING, // master has ordered us to start
- THREAD_TERMINATED // we are quitting and thread is terminated
-};
+
+/// Thread struct is used to keep together all the thread related stuff like locks,
+/// state and especially split points. We also use per-thread pawn and material hash
+/// tables so that once we get a pointer to an entry its life time is unlimited and
+/// we don't have to care about someone changing the entry under our feet.
struct Thread {
+
+ enum ThreadState
+ {
+ INITIALIZING, // Thread is initializing itself
+ SEARCHING, // Thread is performing work
+ AVAILABLE, // Thread is waiting for work
+ BOOKED, // Other thread (master) has booked us as a slave
+ WORKISWAITING, // Master has ordered us to start
+ TERMINATED // We are quitting and thread is terminated
+ };
+
+ void wake_up();
+ bool cutoff_occurred() const;
+ bool is_available_to(int master) const;
+
+ MaterialInfoTable materialTable;
+ PawnInfoTable pawnTable;
int maxPly;
Lock sleepLock;
WaitCondition sleepCond;
SplitPoint* volatile splitPoint;
volatile int activeSplitPoints;
SplitPoint splitPoints[MAX_ACTIVE_SPLIT_POINTS];
+};
- void wake_up() {
- lock_grab(&sleepLock);
- cond_signal(&sleepCond);
- lock_release(&sleepLock);
- }
+
+/// ThreadsManager class is used to handle all the threads related stuff like init,
+/// starting, parking and, the most important, launching a slave thread at a split
+/// point. All the access to shared thread data is done through this class.
+
+class ThreadsManager {
+ /* As long as the single ThreadsManager object is defined as a global we don't
+ need to explicitly initialize to zero its data members because variables with
+ static storage duration are automatically set to zero before enter main()
+ */
+public:
+ Thread& operator[](int threadID) { return threads[threadID]; }
+ void init();
+ void exit();
+ void init_hash_tables();
+
+ int min_split_depth() const { return minimumSplitDepth; }
+ int size() const { return activeThreads; }
+ void set_size(int cnt) { activeThreads = cnt; }
+
+ void read_uci_options();
+ bool available_slave_exists(int master) const;
+ void idle_loop(int threadID, SplitPoint* sp);
+
+ template <bool Fake>
+ void split(Position& pos, SearchStack* ss, Value* alpha, const Value beta, Value* bestValue,
+ Depth depth, Move threatMove, int moveCount, MovePicker* mp, bool pvNode);
+private:
+ Lock mpLock;
+ Depth minimumSplitDepth;
+ int maxThreadsPerSplitPoint;
+ bool useSleepingThreads;
+ int activeThreads;
+ volatile bool allThreadsShouldExit;
+ Thread threads[MAX_THREADS];
};
+extern ThreadsManager Threads;
+
#endif // !defined(THREAD_H_INCLUDED)