tests/thread: Add a test to stress concurrent globals access.

Signed-off-by: Damien George <damien@micropython.org>

tests/thread/stress_globals.py

@@ -0,0 +1,79 @@
+import time, _thread
+
+
+def thread_task():
+    for _ in range(1000):
+        a00
+    print("pass")
+
+
+print("start")
+a00 = None
+
+_thread.start_new_thread(thread_task, ())
+
+# create lots of global variables
+a01 = None
+a02 = None
+a03 = None
+a04 = None
+a05 = None
+a06 = None
+a07 = None
+a10 = None
+a11 = None
+a12 = None
+a13 = None
+a14 = None
+a15 = None
+a16 = None
+a17 = None
+a18 = None
+a19 = None
+a20 = None
+a21 = None
+a22 = None
+a23 = None
+a24 = None
+a25 = None
+a26 = None
+a27 = None
+a28 = None
+a29 = None
+a30 = None
+a31 = None
+a32 = None
+a33 = None
+a34 = None
+a35 = None
+a36 = None
+a37 = None
+a38 = None
+a39 = None
+a40 = None
+a41 = None
+a42 = None
+a43 = None
+a44 = None
+a45 = None
+a46 = None
+a47 = None
+a48 = None
+a49 = None
+a50 = None
+a51 = None
+a52 = None
+a53 = None
+a54 = None
+a55 = None
+a56 = None
+a57 = None
+a58 = None
+a59 = None
+a60 = None
+a61 = None
+a62 = None
+a63 = None
+
+# let the thread finish
+time.sleep(0.1)