stockfish.js: Cannot use threads in TT.clear()

Author: niklasf

src/tt.cpp

@@ -80,6 +80,7 @@ void TranspositionTable::resize(size_t mbSize) {
 
 void TranspositionTable::clear() {
 
+#ifndef __EMSCRIPTEN__
   std::vector<std::thread> threads;
 
   for (size_t idx = 0; idx < Options["Threads"]; idx++)
@@ -102,6 +103,9 @@ void TranspositionTable::clear() {
 
   for (std::thread& th: threads)
       th.join();
+#else
+  std::memset(table, 0, clusterCount * sizeof(Cluster));
+#endif // #ifndef __EMSCRIPTEN__
 }
 
 /// TranspositionTable::probe() looks up the current position in the transposition