Added example answers for chapters 13 and 14 to fix #1

CH_14_multithreading_and_multiprocessing/exercise_06/solution_00.py

@@ -0,0 +1,50 @@
+# Convert the pool above to a safe RPC (remote procedure call)
+# type operation.
+import multiprocessing
+
+WORKERS = 4
+
+
+def say(msg):
+    print(f'Saying: {msg}')
+
+
+# Explicitly define the RPC methods to make this safer
+RPC_METHODS = dict(say=say)
+
+
+class RpcProcess(multiprocessing.Process):
+    def __init__(self, queue: multiprocessing.Queue):
+        super().__init__()
+        self.queue = queue
+
+    def run(self):
+        while True:
+            func_name, args, kwargs = self.queue.get()
+            func = RPC_METHODS[func_name]
+            func(*args, **kwargs)
+            self.queue.task_done()
+
+
+def main():
+    q = multiprocessing.JoinableQueue()
+    q.put(('say', ('hello',), {}))
+    q.put(('say', ('world',), {}))
+    # This should result in an error because this is not a valid
+    # RPC method
+    q.put(('non-existing-method', (), {}))
+
+    for _ in range(WORKERS):
+        p = RpcProcess(q)
+        p.start()
+
+    q.join()
+    q.close()
+
+    for p in multiprocessing.active_children():
+        p.terminate()
+        p.join()
+
+
+if __name__ == '__main__':
+    main()