On Mon, Nov 03, 2003 at 11:53:22 -0500, Robert Love wrote: > On Mon, 2003-11-03 at 08:17, Shinpei Kato wrote: > > > How about types or variables and functions beggining with one "_" > > as _exit()? > > Underscores tend to denote internal functions, or ones with a > corresponding functions that are of a "higher level". > > There is not any official difference between one and two underscore > proceeded functions, but I guess two underscore functions would tend to > be "more internal" than one underscore functions. Actualy it's the other way around. _ functions are usualy purely internal. __ functions are usualy "raw" variants. > For example, consider foo() and __foo(). foo() might obtain requisite > locks and then call __foo(). The standard interface would be foo(), but > you could call __foo() if you knew you already held the locks or > whatever. ... you often want to call such variant from mostly unrelated code because the calling convention is appropriate. Note, that (except BKL) locks in kernel are not recursive. > In the case of the _exit_*() functions, those are internal helper > functions called by do_exit(). ... on the other hand, you never want to call such a helper. ------------------------------------------------------------------------------- Jan 'Bulb' Hudec <bulb@ucw.cz> -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
