[Python-3000] Odd output from test -- buffering bug?

[Guido van Rossum]

Thinking about this some more, the io module isn't thread-safe. It
probably should be (the old file objects were more-or-less
thread-safe, although I believe there might've been corner cases if
one thread were to close a file).

--Guido

2007/10/27, Bill Janssen <janssen at parc.com>:
> No, not unless the test harness uses it.  But there are two threads.
>
> > Hard to say. Never seen this before. Are you using fork() *anywhere*
> > in your tests (not necessarily the affected test)?
> >
> > 2007/10/27, Bill Janssen <janssen at parc.com>:
> > > I'm seeing a sort of odd thing going on when running one of my tests.
> > > I'm seeing two lines of output, from two different threads, being
> > > duplicated when I run with "regrtest -u all -v test_ssl".  This is
> > > with the latest 3K sources on PPC OS X 10.4.10.
> > >
> > > testSTARTTLS (test.test_ssl.ThreadedTests) ...
> > >  client:  sending b'msg 1'...
> > > ^@client:  sending b'msg 1'...
> > >  server:  new connection from ('127.0.0.1', 52371)
> > >  server:  new connection from ('127.0.0.1', 52371)
> > >
> > > This is output to an Emacs shell buffer, so it shows control
> > > characters in the output, and I'm seeing a NUL character being output
> > > there at the beginning of the third line.  Both of the duplicated lines
> > > are being output with code like this:
> > >
> > >     if test_support.verbose:
> > >         sys.stdout.write(
> > >             " client:  sending %s...\n" % repr(msg))
> > >
> > > This looks like some kind of buffering bug.  Is it in the test
> > > harness, or the standard I/O library?
> > >
> > > Bill
> > >
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> >
> >
> > --
> > --Guido van Rossum (home page: http://www.python.org/~guido/)
>
>


-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)