Guido van Rossum added the comment:
It's not fixed. Let me paste in a session. This uses the latest Tulip repo
(simple_tcp_server.py was just added). I've added "import pdb;
pdb.set_trace()" to the top of the client() coroutine, to set a breakpoint (I'm
a very unsophisticated pdb user :-). I step over a yield-from, great. Then I
step into recv(). Note the final 'n' command. This is at the return statement
in recv(). At this point I expect to go back into the client() coroutine, but
somehow the debugger loses control and the program finishes execution without
giving control back.
bash-3.2$ ~/cpython/python.exe -m examples.simple_tcp_server
~/cpython/python.exe -m examples.simple_tcp_server
> /Users/guido/tulip/examples/simple_tcp_server.py(119)client()
-> reader, writer = yield from asyncio.streams.open_connection(
(Pdb) n
n
> /Users/guido/tulip/examples/simple_tcp_server.py(120)client()
-> '127.0.0.1', 12345, loop=loop)
(Pdb)
> /Users/guido/tulip/examples/simple_tcp_server.py(122)client()
-> def send(msg):
(Pdb)
> /Users/guido/tulip/examples/simple_tcp_server.py(126)client()
-> def recv():
(Pdb)
> /Users/guido/tulip/examples/simple_tcp_server.py(132)client()
-> send("add 1 2")
(Pdb)
> add 1 2
> /Users/guido/tulip/examples/simple_tcp_server.py(133)client()
-> msg = yield from recv()
(Pdb) s
s
--Call--
> /Users/guido/tulip/examples/simple_tcp_server.py(126)recv()
-> def recv():
(Pdb) n
n
> /Users/guido/tulip/examples/simple_tcp_server.py(127)recv()
-> msgback = (yield from reader.readline()).decode("utf-8").rstrip()
(Pdb) n
n
> /Users/guido/tulip/examples/simple_tcp_server.py(128)recv()
-> print("< " + msgback)
(Pdb) n
n
< 3.0
> /Users/guido/tulip/examples/simple_tcp_server.py(129)recv()
-> return msgback
(Pdb) n
n
> repeat 5 hello
< begin
< 1. hello
< 2. hello
< 3. hello
< 4. hello
< 5. hello
< end
client task done: Task(<_handle_client>)<result=None>
bash-3.2$
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16596>
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