PARI and POSIX threads

[Philippe Elbaz-Vincent <pev@darboux.math.univ-montp2.fr>]

Hi,

Is there a way to use PARI (i.e., in lib mode) inside a program
which uses posix threads (under Linux/2.6 with glibc 2.2.5 on x86_64) ?
(and of course knowing that there will be calls to PARI functions inside 
threads).
As I understand the troubles come from the garbage collector as the 
variables of 
the PARI stack are globals and as soon that 2 threads run concurently the 
PARI stack would be likely messed up [in fact I tested it and indeed it is 
the case].

Is there a solution to this problem ?
[is it technically doable to run several instances of PARI inside the same 
program ?]

Thanks for your help.

Philippe.