Restore dummy_threading and _dummy_thread, but deprecate them (bpo-31370) (#3648)

1 files changed, 60 insertions, 0 deletions

diff --git a/Lib/test/test_dummy_threading.py b/Lib/test/test_dummy_threading.py
new file mode 100644
index 0000000000..a0c2972a60
--- /dev/null
+++ b/Lib/test/test_dummy_threading.py
@@ -0,0 +1,60 @@
+from test import support
+import unittest
+import dummy_threading as _threading
+import time
+
+class DummyThreadingTestCase(unittest.TestCase):
+
+    class TestThread(_threading.Thread):
+
+        def run(self):
+            global running
+            global sema
+            global mutex
+            # Uncomment if testing another module, such as the real 'threading'
+            # module.
+            #delay = random.random() * 2
+            delay = 0
+            if support.verbose:
+                print('task', self.name, 'will run for', delay, 'sec')
+            sema.acquire()
+            mutex.acquire()
+            running += 1
+            if support.verbose:
+                print(running, 'tasks are running')
+            mutex.release()
+            time.sleep(delay)
+            if support.verbose:
+                print('task', self.name, 'done')
+            mutex.acquire()
+            running -= 1
+            if support.verbose:
+                print(self.name, 'is finished.', running, 'tasks are running')
+            mutex.release()
+            sema.release()
+
+    def setUp(self):
+        self.numtasks = 10
+        global sema
+        sema = _threading.BoundedSemaphore(value=3)
+        global mutex
+        mutex = _threading.RLock()
+        global running
+        running = 0
+        self.threads = []
+
+    def test_tasks(self):
+        for i in range(self.numtasks):
+            t = self.TestThread(name="<thread %d>"%i)
+            self.threads.append(t)
+            t.start()
+
+        if support.verbose:
+            print('waiting for all tasks to complete')
+        for t in self.threads:
+            t.join()
+        if support.verbose:
+            print('all tasks done')
+
+if __name__ == '__main__':
+    unittest.main()