ice-9 format weirdness

ice-9 format weirdness

[Tatu Tarvainen]

Hi,

I'm getting quite weird format errors:

--snip--
FORMAT: INTERNAL ERROR IN FORMAT:ERROR!
        format args: (#<input-output: socket 10> "HTTP/~A ~A ~A
" "1.0" 200 "OK")
        error args:  ("~a superfluous argument~:p" 3)
--snip--

I'm using Guile 1.6.4 and the problem seems to occur only when using
threads (serving pages with (net-http)) and even the simplest uses
of format result in similar errors.

When I substituted the offending format's to use simple-format, the
problem disappeared.

Is there a way to use format in multithreaded apps or do I have to stick
with simple format?

--
Tatu Tarvainen



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Re: ice-9 format weirdness

[Matthias Koeppe]

Tatu Tarvainen <ttarvain@mail.student.oulu.fi> writes:

> Is there a way to use format in multithreaded apps or do I have to stick
> with simple format?

The format procedure is not reentrant/threadsafe due to its use of
global variables that hold state during the formatting process
(format:port, format:output-col, and many more).

To make it threadsafe, one needs to change all these global variables
to fluid variables (and change all uses throughout format.scm).

-- 
Matthias Koeppe -- http://www.math.uni-magdeburg.de/~mkoeppe


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Re: ice-9 format weirdness

[Marius Vollmer]

Tatu Tarvainen <ttarvain@mail.student.oulu.fi> writes:

> Is there a way to use format in multithreaded apps or do I have to stick
> with simple format?

If you can use simple-format, stick to that.  Otherwise, you need to
wrap format with a mutex since it is not implemented in a thread-safe
way.

Of course, we need to eventually fix format to be thread-safe, and
speaking of this, we should probably just wrap it in a mutex in the
Guile sources...

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