my_brk_val       1529 gc/os_dep.c        static caddr_t my_brk_val = 0;
my_brk_val       1535 gc/os_dep.c        if (cur_brk == my_brk_val) {
my_brk_val       1544 gc/os_dep.c        my_brk_val = result + bytes + GC_page_size;	/* Always page aligned */