diff --git a/test_threads.py b/test_threads.py
new file mode 100644
index 00000000..5cf13758
--- /dev/null
+++ b/test_threads.py
@@ -0,0 +1,31 @@
+from juliacall import Main as jl
+from concurrent.futures import ThreadPoolExecutor
+from time import sleep
+
+pool = ThreadPoolExecutor(4)
+
+jl_yield = jl.seval("yield")
+jl_sleep = jl.seval("sleep")
+
+ids = []
+
+
+def target():
+    print("starting")
+    jl.seval("PythonCall.GIL.@unlock sleep(3)")
+    print("stopping")
+    ids.append(jl.Threads.threadid())
+
+
+print("submitting...")
+tasks = [pool.submit(target) for _ in range(8)]
+
+while True:
+    done = [task.done() for task in tasks]
+    print("done:", done)
+    if all(done):
+        break
+    print("sleeping...")
+    jl_sleep(1)
+
+print("threadids:", ids)