Subj : Re: Threading and Timeouts
To   : comp.programming.threads
From : David Schwartz
Date : Wed Jul 20 2005 02:02 pm


"Giancarlo Niccolai" <searchforme@ingoogle.com> wrote in message 
news:dbldbm$blc$2@newsread.albacom.net...

> Sorry, missing last lines:
>
> """
> The length of the message to be sent is specified by the length argument. 
> If
> the message is too long to pass through the underlying protocol, send()
> shall fail and no data shall be transmitted.
> """
>
> So there's no way a write() call on a very long set of data will block 
> until
> all the data is sent. Write()/send() will always write what it can (or
> refuse to write large blocks if the protocol can't handle it i.e. UDP), 
> and
> immediately return after a single send() operation is posted to the 
> network
> stack. Select saying "socket ready" determines that the network stack 
> won't
> block the next operation on that socket.

    What? What if the message is longer than the available buffer space but 
not longer than the underlying protocol can pass?

    DS

.