!13314 [MD][bugfix][multi-process][retinaface_resnet50] Fix retinaface resnet50 ctrl+c hang problem

From: @xiefangqi
Reviewed-by: @liucunwei,@heleiwang
Signed-off-by: @liucunwei

mindspore/dataset/engine/datasets.py

@@ -2195,7 +2195,9 @@ def _pyfunc_worker_exec(index, op_id, mapping, lock, record, *args):
     """
     Internal function for call certain pyfunc in python process.
     """
-    try:
+    # Some threads in multiprocess.pool can't process sigint signal,
+    # and will occur hang problem, so ctrl+c will pass to parent process.
+    signal.signal(signal.SIGINT, signal.SIG_IGN)
     if record:
         pid = os.getpid()
         with lock:
@@ -2203,8 +2205,6 @@ def _pyfunc_worker_exec(index, op_id, mapping, lock, record, *args):
             data[1].add(pid)
             mapping[op_id] = data
     return _GLOBAL_PYFUNC_LIST[index](*args)
-    except KeyboardInterrupt:
-        raise Exception("Multiprocess MapOp worker receives KeyboardInterrupt")
 
 
 # PythonCallable wrapper for multiprocess pyfunc
@@ -3262,6 +3262,10 @@ def _generator_worker_loop(dataset, idx_queue, result_queue, eof, is_multiproces
         try:
             idx = idx_queue.get(timeout=1)
         except KeyboardInterrupt:
+            if is_multiprocessing:
+                eof.set()
+                idx_queue.cancel_join_thread()
+                result_queue.cancel_join_thread()
             raise Exception("Generator worker receives KeyboardInterrupt.")
         except queue.Empty:
             if eof.is_set():
@@ -3288,6 +3292,10 @@ def _generator_worker_loop(dataset, idx_queue, result_queue, eof, is_multiproces
             try:
                 result_queue.put(result, timeout=5)
             except KeyboardInterrupt:
+                if is_multiprocessing:
+                    eof.set()
+                    idx_queue.cancel_join_thread()
+                    result_queue.cancel_join_thread()
                 raise Exception("Generator worker receives KeyboardInterrupt.")
             except queue.Full:
                 if eof.is_set():