X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fthread.cpp;h=7f5ce7148f3fe25c5d243f7ff43d9b8cafc0a5b0;hp=271890c6f008b85eedee8d2302f0ebe4f2353e57;hb=e70eae2c91840c06f69e900c231b6a8a9660b438;hpb=ed0fb0b05fa72ccc6333bf5331eb9abeb7c86457

diff --git a/src/thread.cpp b/src/thread.cpp
index 271890c6..7f5ce714 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -50,7 +50,7 @@ Thread::Thread(Fn fn) : splitPoints() {
   start_fn = fn;
   idx = Threads.size();
 
-  do_sleep = (fn != &Thread::main_loop); // Avoid a race with start_searching()
+  is_finished = (fn != &Thread::main_loop); // Avoid a race with start_searching()
 
   if (!thread_create(handle, start_routine, this))
   {
@@ -64,10 +64,10 @@ Thread::Thread(Fn fn) : splitPoints() {
 
 Thread::~Thread() {
 
-  assert(do_sleep);
+  assert(is_finished);
 
   do_exit = true; // Search must be already finished
-  wake_up();
+  notify_one();
   thread_join(handle); // Wait for thread termination
 }
 
@@ -81,7 +81,8 @@ void Thread::timer_loop() {
   while (!do_exit)
   {
       mutex.lock();
-      sleepCondition.wait_for(mutex, maxPly ? maxPly : INT_MAX);
+      while (!maxPly && !do_exit)
+          sleepCondition.wait_for(mutex, maxPly ? maxPly : INT_MAX);
       mutex.unlock();
       check_time();
   }
@@ -97,10 +98,10 @@ void Thread::main_loop() {
   {
       mutex.lock();
 
-      do_sleep = true; // Always return to sleep after a search
+      is_finished = true; // Always return to sleep after a search
       is_searching = false;
 
-      while (do_sleep && !do_exit)
+      while (is_finished && !do_exit)
       {
           Threads.sleepCondition.notify_one(); // Wake up UI thread if needed
           sleepCondition.wait(mutex);
@@ -120,10 +121,10 @@ void Thread::main_loop() {
 }
 
 
-// Thread::wake_up() wakes up the thread, normally at the beginning of the search
-// or, if "sleeping threads" is used at split time.
+// Thread::notify_one() wakes up the thread, normally at the beginning of the
+// search or, if "sleeping threads" is used at split time.
 
-void Thread::wake_up() {
+void Thread::notify_one() {
 
   mutex.lock();
   sleepCondition.notify_one();
@@ -131,19 +132,12 @@ void Thread::wake_up() {
 }
 
 
-// Thread::wait_for_stop_or_ponderhit() is called when the maximum depth is
-// reached while the program is pondering. The point is to work around a wrinkle
-// in the UCI protocol: When pondering, the engine is not allowed to give a
-// "bestmove" before the GUI sends it a "stop" or "ponderhit" command. We simply
-// wait here until one of these commands (that raise StopRequest) is sent and
-// then return, after which the bestmove and pondermove will be printed.
+// Thread::wait_for() set the thread to sleep until condition 'b' turns true
 
-void Thread::wait_for_stop_or_ponderhit() {
-
-  Signals.stopOnPonderhit = true;
+void Thread::wait_for(volatile const bool& b) {
 
   mutex.lock();
-  while (!Signals.stop) sleepCondition.wait(mutex);;
+  while (!b) sleepCondition.wait(mutex);
   mutex.unlock();
 }
 
@@ -192,6 +186,7 @@ void ThreadPool::init() {
 
   timer = new Thread(&Thread::timer_loop);
   threads.push_back(new Thread(&Thread::main_loop));
+  sleepWhileIdle = true;
   read_uci_options();
 }
 
@@ -216,7 +211,6 @@ void ThreadPool::read_uci_options() {
 
   maxThreadsPerSplitPoint = Options["Max Threads per Split Point"];
   minimumSplitDepth       = Options["Min Split Depth"] * ONE_PLY;
-  useSleepingThreads      = Options["Use Sleeping Threads"];
   size_t requested        = Options["Threads"];
 
   assert(requested > 0);
@@ -232,34 +226,6 @@ void ThreadPool::read_uci_options() {
 }
 
 
-// wake_up() is called before a new search to start the threads that are waiting
-// on the sleep condition and to reset maxPly. When useSleepingThreads is set
-// threads will be woken up at split time.
-
-void ThreadPool::wake_up() const {
-
-  for (size_t i = 0; i < threads.size(); i++)
-  {
-      threads[i]->maxPly = 0;
-      threads[i]->do_sleep = false;
-
-      if (!useSleepingThreads)
-          threads[i]->wake_up();
-  }
-}
-
-
-// sleep() is called after the search finishes to ask all the threads but the
-// main one to go waiting on a sleep condition.
-
-void ThreadPool::sleep() const {
-
-  // Main thread will go to sleep by itself to avoid a race with start_searching()
-  for (size_t i = 1; i < threads.size(); i++)
-      threads[i]->do_sleep = true;
-}
-
-
 // available_slave_exists() tries to find an idle thread which is available as
 // a slave for the thread 'master'.
 
@@ -284,8 +250,8 @@ bool ThreadPool::available_slave_exists(Thread* master) const {
 
 template <bool Fake>
 Value ThreadPool::split(Position& pos, Stack* ss, Value alpha, Value beta,
-                        Value bestValue, Move* bestMove, Depth depth,
-                        Move threatMove, int moveCount, MovePicker* mp, int nodeType) {
+                        Value bestValue, Move* bestMove, Depth depth, Move threatMove,
+                        int moveCount, MovePicker& mp, int nodeType) {
 
   assert(pos.pos_is_ok());
   assert(bestValue > -VALUE_INFINITE);
@@ -313,7 +279,7 @@ Value ThreadPool::split(Position& pos, Stack* ss, Value alpha, Value beta,
   sp.beta = beta;
   sp.nodeType = nodeType;
   sp.bestValue = bestValue;
-  sp.mp = mp;
+  sp.mp = &mp;
   sp.moveCount = moveCount;
   sp.pos = &pos;
   sp.nodes = 0;
@@ -336,9 +302,7 @@ Value ThreadPool::split(Position& pos, Stack* ss, Value alpha, Value beta,
           sp.slavesMask |= 1ULL << i;
           threads[i]->curSplitPoint = &sp;
           threads[i]->is_searching = true; // Slave leaves idle_loop()
-
-          if (useSleepingThreads)
-              threads[i]->wake_up();
+          threads[i]->notify_one(); // Could be sleeping
 
           if (++slavesCnt + 1 >= maxThreadsPerSplitPoint) // Master is always included
               break;
@@ -381,20 +345,8 @@ Value ThreadPool::split(Position& pos, Stack* ss, Value alpha, Value beta,
 }
 
 // Explicit template instantiations
-template Value ThreadPool::split<false>(Position&, Stack*, Value, Value, Value, Move*, Depth, Move, int, MovePicker*, int);
-template Value ThreadPool::split<true>(Position&, Stack*, Value, Value, Value, Move*, Depth, Move, int, MovePicker*, int);
-
-
-// set_timer() is used to set the timer to trigger after msec milliseconds.
-// If msec is 0 then timer is stopped.
-
-void ThreadPool::set_timer(int msec) {
-
-  timer->mutex.lock();
-  timer->maxPly = msec;
-  timer->sleepCondition.notify_one(); // Wake up and restart the timer
-  timer->mutex.unlock();
-}
+template Value ThreadPool::split<false>(Position&, Stack*, Value, Value, Value, Move*, Depth, Move, int, MovePicker&, int);
+template Value ThreadPool::split<true>(Position&, Stack*, Value, Value, Value, Move*, Depth, Move, int, MovePicker&, int);
 
 
 // wait_for_search_finished() waits for main thread to go to sleep, this means
@@ -404,8 +356,7 @@ void ThreadPool::wait_for_search_finished() {
 
   Thread* t = main_thread();
   t->mutex.lock();
-  t->sleepCondition.notify_one(); // In case is waiting for stop or ponderhit
-  while (!t->do_sleep) sleepCondition.wait(t->mutex);
+  while (!t->is_finished) sleepCondition.wait(t->mutex);
   t->mutex.unlock();
 }
 
@@ -422,7 +373,7 @@ void ThreadPool::start_searching(const Position& pos, const LimitsType& limits,
   Signals.stopOnPonderhit = Signals.firstRootMove = false;
   Signals.stop = Signals.failedLowAtRoot = false;
 
-  RootPosition = pos;
+  RootPos = pos;
   Limits = limits;
   SetupStates = states; // Ownership transfer here
   RootMoves.clear();
@@ -431,6 +382,6 @@ void ThreadPool::start_searching(const Position& pos, const LimitsType& limits,
       if (searchMoves.empty() || count(searchMoves.begin(), searchMoves.end(), ml.move()))
           RootMoves.push_back(RootMove(ml.move()));
 
-  main_thread()->do_sleep = false;
-  main_thread()->wake_up();
+  main_thread()->is_finished = false;
+  main_thread()->notify_one(); // Starts main thread
 }