brk               369 gc/os_dep.c    static char *brk = memory;
brk               373 gc/os_dep.c      void *p = brk;
brk               375 gc/os_dep.c      brk += increment;
brk               377 gc/os_dep.c      if (brk >  memory + sizeof memory)
brk               379 gc/os_dep.c          brk -= increment;