> If I'm writing a library and I'd like to use procdata, is there any
> way to safely do so, considering that applications using the library
> might be using procdata as well? Perhaps it should take a key, like
> pthread_getspecific/_setspecific?

since procdata(2) it is unused, 
        cd /sys/src && grep -l procdata `{find|grep '\.[ch]'}
        ./libthread/id.c

a first cut would be to add this to
the man page

        .SH BUGS
        steals
        .IR procdata (2).

but i would consider it a warning flag that
there are no current users of threadata or procdata.

- erik

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