tasks_cpp: add function to query for the maximum number of queues

tasks_cpp/include/embb/tasks/node.h

@@ -120,6 +120,15 @@ class Node {
   static void Finalize();
 
   /**
+    * Returns the number of available queues.
+    * \return The number of available queues
+    * \waitfree
+    */
+  mtapi_uint_t GetQueueCount() const {
+    return queue_count_;
+  }
+
+  /**
     * Returns the number of available cores.
     * \return The number of available cores
     * \waitfree
@@ -218,6 +227,7 @@ class Node {
     mtapi_size_t node_local_data_size,
     mtapi_task_context_t * context);
 
+  mtapi_uint_t queue_count_;
   mtapi_uint_t core_count_;
   mtapi_uint_t worker_thread_count_;
   mtapi_action_hndl_t action_handle_;

tasks_cpp/src/node.cc

@@ -74,6 +74,8 @@ Node::Node(
     EMBB_THROW(embb::base::ErrorException,
       "mtapi::Node could not initialize mtapi");
   }
+  mtapi_node_get_attribute(node_id, MTAPI_NODE_MAX_QUEUES, &queue_count_, sizeof(queue_count_), &status);
+  assert(MTAPI_SUCCESS == status);
   core_count_ = info.hardware_concurrency;
   worker_thread_count_ = embb_core_set_count(&attr->core_affinity);
   action_handle_ = mtapi_action_create(TASKS_CPP_JOB, action_func,