void ThreadPool::start_thinking(const Position& pos, StateListPtr& states,
const Search::LimitsType& limits) {
main()->wait_for_search_finished();
Search::Signals.stopOnPonderhit = Search::Signals.stop = false;
Search::Limits = limits;
Search::RootMoves rootMoves;
for (const auto& m : MoveList<LEGAL>(pos))
if ( limits.searchmoves.empty()
|| std::count(limits.searchmoves.begin(), limits.searchmoves.end(), m))
rootMoves.push_back(Search::RootMove(m));
// After ownership transfer 'states' becomes empty, so if we stop the search
// and call 'go' again without setting a new position states.get() == NULL.
assert(states.get() || setupStates.get());
if (states.get())
setupStates = std::move(states); // Ownership transfer, states is now empty
StateInfo tmp = setupStates->back();
for (Thread* th : Threads)
{
th->maxPly = 0;
th->rootDepth = DEPTH_ZERO;
th->rootMoves = rootMoves;
th->rootPos.set(pos.fen(), pos.is_chess960(), &setupStates->back(), th);
}
setupStates->back() = tmp; // Restore st->previous, cleared by Position::set()
main()->start_searching();
}
