micropython: add micropython component

components/language/micropython/tests/thread/mutate_dict.py

@@ -0,0 +1,43 @@
+# test concurrent mutating access to a shared dict object
+#
+# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
+
+import _thread
+
+# the shared dict
+di = {"a": "A", "b": "B", "c": "C", "d": "D"}
+
+# main thread function
+def th(n, lo, hi):
+    for repeat in range(n):
+        for i in range(lo, hi):
+            di[i] = repeat + i
+            assert di[i] == repeat + i
+
+            del di[i]
+            assert i not in di
+
+            di[i] = repeat + i
+            assert di[i] == repeat + i
+
+            assert di.pop(i) == repeat + i
+
+    with lock:
+        global n_finished
+        n_finished += 1
+
+
+lock = _thread.allocate_lock()
+n_thread = 4
+n_finished = 0
+
+# spawn threads
+for i in range(n_thread):
+    _thread.start_new_thread(th, (30, i * 300, (i + 1) * 300))
+
+# busy wait for threads to finish
+while n_finished < n_thread:
+    pass
+
+# check dict has correct contents
+print(sorted(di.items()))