Re: [libmicrohttpd] winsock & EPOLL_TURBO

[LRN]

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On 10.08.2013 19:54, Christian Grothoff wrote:
> On 08/10/13 17:50, LRN wrote:
>> I've made a patch that fixes the problem, no need to disable shutdown()
>> completely. Here it is.
>>
>> The problem is that winsock freaks out (and prevents you from sending
>> the reply) if you shutdown with SD_RECEIVE while there is data in recv
>> buffer.
>>
>> Sorry, couldn't send the patch sooner - had to reproduce the problem in
>> a testcase, then test the patch in MHD.
> 
> I'm not sure that patch _always_ works.  There is a natural race 
> condition in that code, as more data can always be received just between 
> your recvfrom call and the shutdown call.

Yeah, i've modified my testcase, and indeed, if i let the client send
more data after i've purged the buffer, the old buggy send() behaviour
returns. Setting recv buffer size to 0 doesn't prevent it.

The winsocky way (also kind of documented in MSDN) to handle this is to
send the reply BEFORE shutting down, and THEN shut down.

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