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From: Pankaj Yadav <pankajdnapster AT gmail DOT com>
Date: Tue, 16 Aug 2016 09:47:49 +0530
Message-ID: <CAAPqxJx5Tw7pMfOHSpV+O_sdKxE=got6J2QbO4rqDyc+uOdAvg@mail.gmail.com>
Subject: Re: On WIN7, write() not returning immediately even on non-blocking sockets
To: cygwin AT cygwin DOT com
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On Aug 16, 2016 12:31 AM, "Achim Gratz" <Stromeko AT nexgo DOT de> wrote:
>
> Pankaj Yadav writes:
> > The code where it gets stuck is
> >
> > printf("Nonblocking:%d\n",(fcntl(t_qelem->respsock, F_GETFL, 0) &
> > O_NONBLOCK))?1:0;
> > i = write(t_qelem->respsock,&t_qelem->webtoresp[t_qelem->webtorespsent],t_qelem->webtoresplen-t_qelem->webtorespsent);
> > printf("written\n");
> >
> > Output is :  Non-blocking:1 and then it does NOT print "written" ever.
>
> You'd have better chances of getting help if you could come up with a
> minimal program that exhibits the error.

I will try my best but it sounds very hard to isolate a minimal
program which will exhibit the issue.

But one thing is pretty clear, write() shouldnt block for long on a
non-blocking socket.Please tell me if there are any situation unknown
to me in which write on non-blocking socket can block and keep
countinuously calling  fhandler_socket::wait_for_events() and waiting
forever. And its happening only on win7 not any other os.

>
>
> Regards,
> Achim.
> --
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