Add python object creation for unboxing SyclQueue

Author: ZzEeKkAa

numba_dpex/core/runtime/_dpexrt_python.c

@@ -1287,29 +1287,28 @@ static int DPEXRT_sycl_queue_from_python(NRT_api_functions *nrt,
 static PyObject *DPEXRT_sycl_queue_to_python(NRT_api_functions *nrt,
                                              queuestruct_t *queuestruct)
 {
-    PyObject *orig_queue = NULL;
-
-    orig_queue = nrt->get_data(queuestruct->meminfo);
-    // FIXME: Better error checking is needed to enforce the boxing of the queue
-    // object. For now, only the minimal is done as the returning of SyclQueue
-    // from a dpjit function should not be a used often and the dpctl C API for
-    // type checking etc. is not ready.
-    if (orig_queue == NULL) {
-        PyErr_Format(PyExc_ValueError,
-                     "In 'box_from_queuestruct_parent', "
-                     "failed to create a new dpctl.SyclQueue object.");
-        return NULL;
+    PyObject *queue_obj = NULL;
+
+    queue_obj = nrt->get_data(queuestruct->meminfo);
+
+    if (queue_obj == NULL) {
+        // Make create copy of queue_ref so we don't need to manage nrt lifetime
+        // from python object.
+        queue_obj = SyclQueue_Make(queuestruct->queue_ref);
+    }
+    else {
+        // Unfortunately we can not optimize (nrt->release that triggers
+        // Py_DECREF() from the destructor) and Py_INCREF() because nrt may need
+        // the object even if we return it to python.
+        // We need to increase reference count because we are returning new
+        // reference to the same queue.
+        Py_INCREF(queue_obj);
     }
 
-    // TODO: is there any way to release meminfo without calling dtor so we dont
-    //  call incref, decref one after another.
-    // We need to increase reference count because we are returning new
-    // reference to the same queue.
-    Py_INCREF(orig_queue);
     // We need to release meminfo since we are taking ownership back.
     nrt->release(queuestruct->meminfo);
 
-    return orig_queue;
+    return queue_obj;
 }
 
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