[gambit-list] I/O Question

Francisco francisco.listas at gmail.com
Thu May 1 19:21:02 EDT 2008

Marc Feeley wrote:
> On 1-May-08, at 5:50 PM, Francisco wrote:
>> (define (with-string-stop str c)
>>  (let
>>      ((port (open-string str)))
>>    (read-string-until-char port c)))
> "open-string" creates an input-output-port, that is a port you can 
> write to and read from.  Whatever you write to it becomes readable (in 
> other words it is a FIFO).  So the system cannot tell when the stream 
> is at "end-of-file" because in principle some thread might have a 
> reference to the port and at some point in the future add something to 
> the FIFO.  However, the scheduler sees that no other thread is 
> runnable when the read-char is called on an empty FIFO, so it declares 
> that there is a deadlock (no further progress is possible).
> So change the open-string by open-input-string (which creates an 
> input-(only)-port) and the end-of-file will be read by read-char as 
> you expect it.
> Marc
Oh thank you! And what about if want to do it on a network socket, I 
want to parse the input until a char is found, or until the end of the 
available input, but according to that input I need to respond using the 
same socket
How do I do that?


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