README file of RTLinux POSIX Signals.

Written by J. Vidal <jvidal@disca.upv.es>, F. Vazquez <Fidel@fie.uclv.edu.cu> &
I. Ripoll <ismael.ripoll@disca.upv.es>
Copyright (C) [date] OCERA Consortium.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation version 2.

Signals are an integral part of multitasking in the UNIX/POSIX environment. 
Signals are used for many purposes, including:
 - Process notification of asynchronous event occurrence 
  (timer expiration, etc.)
 - Emulation of multitasking.
 - Interprocess communication.

This patch implements the POSIX interface to signals in RTLinux. 
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.