shared library using pthreads

hi,
i have written a shared library for a garbage collector. i want to
multithread it.
when i compile the user program as
gcc test.cpp -lgc -ldl
the program executes in the desired manner. (__note__ i am not using
any threading features as yet)
but if i compile it as gcc test.cpp -lgc -ldl -pthread , it gives no
errors but on executing gives segmentation fault. why is it so?

__note__ i have written a wrapper routine for malloc and i think it is
aborting wen the user program is calling malloc.

thanx in advance,

.

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