On May 22, 2007, at 11:11 PM, felix winkelmann wrote:
On 5/22/07, Dan Muresan <[EMAIL PROTECTED]> wrote:
>> While we're on the topic, I find Chicken's lightweight-threads and
>> srfi-18 compatible streams incredibly useful. However, it's a
pity that
>> only unit tcp (and the (process) function) can create such
streams.
>
> I assume you mean streams that block the current thread on I/O,
yes?
> That shouldn't be a problem as long as you have an fd and can
make it
> non-blocking.
Yes, streams that block the current thread on I/O. Are you saying
that I
can already create such streams from an fd? How?
Kon has recently added ##sys#custom-[input|output]-port to the
posix unix which sound like they are useful (Kon, can you say
something about these?)
Not so recent ;-)
They are used by the '##sys#process' routine, which is the guts of
the 'process' routines. Part of my refactoring of process into
smaller pieces. The ##sys#custom-[input|output]-port routines are
essentially the port creation code of the original 'process' procedure.
Im afraid they are undocumented for a reason:
- No UTF8 support
- No Read-String/Read-Line
- No Windows support
However, they do work (in use by the osprocess egg).
(##sys#custom-input-port LOCATION NAME FILENO
[BUFFER-INFO [ON-CLOSE [MORE-PREDICATE]]])
(##sys#custom-output-port LOCATION NAME FILENO
[BUFFER-INFO [ON-CLOSE]])
LOCATION calling procedure/context id
NAME name for the port (usually the process command pathname)
FILENO open file descriptor
BUFFER-INFO either a fixnum size or a string
ON-CLOSE fileno was closed notification procedure
MORE-PREDICATE boolean procedure indicating whether more input is
available,
usually not needed but the programmer may know
something that
the C 'read' procedure doesn't
Use (##sys#file-nonblocking! FILENO) before calling ##sys#custom-
[input|output]-port if such is desired.
Best Wishes,
Kon
You can also look at the nbstdin egg, which has a "nonblocking-
input-port"
procedure.
cheers,
felix
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