Re: VO & Threads (was: OO2C -> Debian?)

[Michael van Acken <KK120y2@mail.lvr.de>]

>Just for the record: VisualOberon is currently not known to be
>thread safe. In fact I'm not sure what a library needs to do to be
>thread safe. I would be interested to discuss such topics in this
>mailing list. Exspecially for the current version of VO there is the
>problem, too, that X itself on most systems is *not* threadsafe.
>XFree86 can be made threadsafe but must be exspecially compiled for.

The X server is connected to its clients through a serial
interface (sockets), and can probably considered thread safe.
The X client, i.e., the program side libX11, is not thread 
safe on most systems.  But as long as all calls to libX11 are
serialized properly, it should be possible to use a multi-
threaded VO library.  This probably means, that one has to put
a huge mutex around X11.

In other words: If VO is careful about its calls to libX11,
it could run multi-threaded on systems that do not provide
a mt libX11.

-- mva