tss_t
int tss_set(tss_t, void *);
int tss_create(tss_t *, tss_dtor_t);
void tss_delete(tss_t);
void * tss_get(tss_t);
tss_create(tss_t *key, tss_dtor_t dtor)
tss_delete(tss_t key)
tss_get(tss_t key)
tss_set(tss_t key, void *val)