# This file was originally from the Linux kernel source.#   -- Cort <cort@fsmlabs.com>## Format of this file: description<nl>variable<nl>help text<nl><nl>. If# the question being documented is of type "choice", we list only the# first occurring config variable. The help texts may contain empty# lines, but every non-empty line must be indented two positions.# Order of the help texts does not matter, however, no variable should# be documented twice: if it is, only the first occurrence will be# used by Configure. We try to keep the help texts of related variables# close together. Lines starting with `#' are ignored. To be nice to# menuconfig, limit your line length to 70 characters. Use emacs'# kfill.el to edit and ispell.el to spell check this file or you lose.## If you add a help text to this file, please try to be as gentle as# possible. Don't use unexplained acronyms and generally write for the# hypothetical ignorant but intelligent user who has just bought a PC,# removed Windows, installed Linux and is now recompiling the kernel# for the first time. Tell them what to do if they're unsure. Technical # information should go in a README in the Documentation directory.# Mention all the relevant READMEs and HOWTOs in the help text.# Repetitions are fine since the help texts are not meant to be read# in sequence.## All this was shamelessly stolen from several different sources. Many# thanks to all the contributors. Feel free to use these help texts in# your own kernel configuration tools. The texts are copyrighted (c)# 1995-1999 by Axel Boldt and many others and are governed by the GNU# General Public License. POSIX Style IOCONFIG_RTL_POSIX_IO  This allows POSIX style IO operations inside of RTLinux.Floating Point SupportCONFIG_RTL_FP_SUPPORT  This allows the use of FP operations in real-time threads.Dev Mem SupportCONFIG_RTL_DEVMEM_SUPPORT  Saying Y to this option enables support of the /dev/mem device  in RTL-threads.Enable DebuggingCONFIG_RTL_DEBUG  This option compiles RTLinux modules with debugging support.  Say Y if you want to debug RT-programs.Mutex SupportCONFIG_RTL_MUTEX_SUPPORT  Saying Y to this option will enable POSIX mutex support.  If unsure, say Y.Max Number of Mutex WaitersCONFIG_RTL_MUTEX_MAX_WAITERS  Maximum number of RT-threads that can be blocked on a mutex.rtl_printf uses printkCONFIG_RTL_SLOW_CONSOLE  Say Y here if you want rtl_printf output to be buffered and  then passed to Linux printk facility. It is useful if you  are in X-Windows, since the output can then be viewed via  dmesg and/or syslog. In certain situations, you may want  to disable this option, for example when Linux has  no chance to print a message (a crash occurs).RTLinux V1 API supportCONFIG_RTL_USE_V1_API  Say Y here if you need the old RTLinux v1 API.POSIX Priority Protection_POSIX_THREAD_PRIO_PROTECT  Enables support for the POSIX priority ceiling protocol.  See pthread_mutexattr_setprioceiling(3).POSIX Timeouts_POSIX_TIMEOUTS  Support for the POSIX timeouts option:  pthread_mutex_timedlock, sem_timedwait.RTLinux tracer supportCONFIG_RTL_TRACER  The RTLinux tracer allows tracing various events in the system.Nolinux supportCONFIG_RTL_SUSPEND_LINUX  On SMP, this feature allows dedicating some CPUs exclusively  to RTLinux threads.  Among other things, this can be used  to dramatically reduce scheduling jitter. You need a 2.4.X kernel  with CONFIG_SMP enabled for this option to work.POSIX SignalsCONFIG_OC_PSIGNALS  A POSIX signal is the software equivalent of an interrupt or   exception occurrence. Say Y here if you want to make use of   the POSIX interface to signals. This allows you to send signals    (RTL_SIGUSR1,RTL_SIGUSR2 and from signal RTL_SIGRTMIN to RTL_SIGRTMAX)   to threads (pthread_kill), blocking signals (pthread_sigmask),   suspend a thread waiting for a signal to arrive (sigsuspend) and   install signal handlers, among other things. Signals are in  determinated cases a good interprocess communication mechanism.  POSIX timersCONFIG_OC_PTIMERS  POSIX timers allows a mechanism that can notify a thread when   the time as measured by a particular clock has reached or passed   a specified value, or when a specified amount of time has passed.  Facilities supported by POSIX timers that are desirable for   real-time operating systems:     - Support for additional clocks.     - Allowance for greater time resolution (modern timers are        capable of nanosecond resolution; the hardware should support it)       - Ability to use POSIX Signals to indicate timer expiration.  POSIX timers deppends on POSIX signals.