Fix issue when re-using the main-thread and terminating the scheduler

lib/pls/include/pls/internal/data_structures/locking_deque.h

@@ -58,7 +58,7 @@ class locking_deque {
                   "Must only push types of <Item> onto work_stealing_deque<Item>");
 
     std::lock_guard<base::spin_lock> lock{lock_};
-    auto deque_item = stack_->push(locking_deque_container<Item, T>{new_item});
+    auto deque_item = stack_->push<locking_deque_container<Item, T>>(new_item);
     deque_item->item_ = &deque_item->content_;
 
     if (tail_ != nullptr) {

lib/pls/src/internal/scheduling/scheduler.cpp

@@ -81,6 +81,9 @@ void scheduler::terminate(bool wait_for_workers) {
 
   if (wait_for_workers) {
     for (unsigned int i = 0; i < num_threads_; i++) {
+      if (reuse_thread_ && i == 0) {
+        continue;
+      }
       memory_->thread_for(i)->join();
     }
   }