char_map                Split a Character Vector into its Unique
                        Elements and a Mapping on These
compress_chars          Recursively Call 'char_map'/'map2char' on a
                        List
copy2shm                Copy to and Allocate from POSIX Shared Memory
etry                    Extended try
mclapply                parallel::mclapply Wrapper for Better
                        Performance, Error Handling, Seeding and UX
sem                     Named POSIX Semaphores
semv                    POSIX-style System V Semaphores
