[Ns-bugs] [Bug 131] Sending data in the TCP send callback causes infinite recursion

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http://www.nsnam.org/bugzilla/show_bug.cgi?id=131





------- Comment #6 from gjcarneiro at gmail.com  2008-02-06 11:55 -------
(In reply to comment #5)
[...]
> I actually proposed that you are notified when data is removed from the tx
> buffer after it was acked, that is, when there is room in the tx buffer. So, it
> seems that we agree.

We _almost_ agree.  The events "data is removed from the tx buffer" and "there
is room in the tx buffer" are not completely coincidental; there _is_ a
difference.

In real BSD sockets there is a buffer of a certain maximum size between
application and socket.  In BSD sockets, applications can send to the socket
buffer a certain ammount of traffic even before any previous traffic is
acknowledged and removed from the tx buffer.  When a socket is connected, it
enters the "there is room in the tx buffer" state immediately, even before any
"data is removed from the tx buffer" event.  It's a subtle difference, sure,
but I can't be sure it is not significant, and it does not sound like
confusing/merging the two states will simplify anything for the programmer
(well, maybe it will not make life easier for Raj, but that's a different story
:).


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