[Python-Dev] thread semantics for file objects
pedronis at strakt.com
Thu Mar 17 23:00:18 CET 2005
Jeremy Hylton wrote:
> On Thu, 17 Mar 2005 16:25:44 -0500, Aahz <aahz at pythoncraft.com> wrote:
>>On Thu, Mar 17, 2005, Jeremy Hylton wrote:
>>>Are the thread semantics for file objecst documented anywhere? I
>>>don't see anything in the library manual, which is where I expected to
>>>find it. It looks like read and write are atomic by virtue of fread
>>>and fwrite being atomic.
>>Uncle Timmy will no doubt agree with me: the semantics don't matter.
>>NEVER, NEVER access the same file object from multiple threads, unless
>>you're using a lock. And even using a lock is stupid.
> I'm not looking for your permission or approval. I just want to know
> what semantics are intended. If the documentation wants to say that
> the semantics are undefined that okay, although I think we need to say
> more because some behavior has been provided by the implementation for
> a long time.
I think this is left unspecified for example by Java too. I would be
surprised if Jython would offer the same characteristics in this respect
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