1 files changed, 42 insertions, 0 deletions
diff --git a/tests/thread/mutate_dict.py b/tests/thread/mutate_dict.py
new file mode 100644
index 0000000000..c57d332d51
--- /dev/null
+++ b/tests/thread/mutate_dict.py
@@ -0,0 +1,42 @@
+# 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()))