[fpc-pascal] socket timeout

[Xiangrong Fang]

I thought MSG_DONTWAIT is actually the flag to switch to nonblocking mode,
isn't it?  As a matter of fact, the fprecv() above would get a result of -1
and a sockterror of "Try Again", which is exactly the behavior of
nonblocking read.


2013/4/17 Rainer Stratmann <rainerstratmann at t-online.de>

>  On Wednesday 17 April 2013 09:17:09 you wrote:
> > Will this be a CPU hog:
> >
> > t := Now;
> > while fprecv(s, @buf, buf_len, MSG_DONTWAIT) < 0 do begin
> >   if Now - t > 0.00001 * timeout then Break;   // approx. <timeout>
> seconds
> > end;
> >
> > Thanks
>
> I did not read the whole thread, but that you favorite blocking mode
> (which I
> don't use).
>
> For MSG_DONTWAIT as far I know you have to change to the nonblocking mode.
>
> >
> >
> > 2013/4/16 Luca Olivetti <luca at ventoso.org>
> >
> > > Al 16/04/13 12:20, En/na Michael Schnell ha escrit:
> > > > On 04/16/2013 11:26 AM, Xiangrong Fang wrote:
> > > >> How can I set the connection and read/write timeout when using
> socket
> > > >> in free pascal?
> > > >
> > > > I seem to remember that synapse can do this.
> > >
> > > Only in svn and it does it this way
> > >
> > > if FConnectionTimeout > 0 then
> > > begin
> > >
> > >   // connect in non-blocking mode
> > >   b := NonBlockMode;
> > >   NonBlockMode := true;
> > >   SockCheck(synsock.Connect(FSocket, Sin));
> > >   if (FLastError = WSAEINPROGRESS) OR (FLastError = WSAEWOULDBLOCK)
> then
> > >
> > >     if not CanWrite(FConnectionTimeout) then
> > >
> > >       FLastError := WSAETIMEDOUT;
> > >
> > >   NonBlockMode := b;
> > >
> > > end
> > > else
> > >
> > >   SockCheck(synsock.Connect(FSocket, Sin));
> > >
> > > NonBlockMode in turn uses fpIoCtl with the FIONBIO parameter,
> > > WSAEINPROGRESS=EsysEINPROGRESS, WSAEWOULDBLOCK=EsysEWOULDBLOCK and
> > > CanWrite  does an fpSelect
> > >
> > > Bye
> > > --
> > > Luca
> > >
> > > _______________________________________________
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> > > http://lists.freepascal.org/mailman/listinfo/fpc-pascal
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