Merge pull request #19436 from gnossen/getsockopt_mac

Fix multiprocessing example for MacOS.

examples/python/multiprocessing/server.py

@@ -87,7 +87,7 @@ def _reserve_port():
     """Find and reserve a port for all subprocesses to use."""
     sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
     sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
-    if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) != 1:
+    if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 0:
         raise RuntimeError("Failed to set SO_REUSEPORT.")
     sock.bind(('', 0))
     try: