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/* Handle real-time signal allocation.
Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <features.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/syscall.h>
/* Only enable rt signals when it is supported at compile time */
#ifndef __NR_rt_sigaction
/* In these variables we keep track of the used variables. If the
platform does not support any real-time signals we will define the
values to some unreasonable value which will signal failing of all
the functions below. */
static int current_rtmin = -1;
static int current_rtmax = -1;
#else
# ifdef __UCLIBC_HAS_THREADS_NATIVE__
static int current_rtmin = __SIGRTMIN + 2;
# elif defined __UCLIBC_HAS_THREADS__ && !defined __LINUXTHREADS_OLD__
/* psm: might be good for LT old as well, do not want to break it for now */
/* Sanity check */
# if !defined __SIGRTMIN || (__SIGRTMAX - __SIGRTMIN) < 3
# error "This must not happen"
# endif
static int current_rtmin = __SIGRTMIN + 3;
# else
static int current_rtmin = __SIGRTMIN;
# endif
static int current_rtmax = __SIGRTMAX;
#endif
/* Return number of available real-time signal with highest priority. */
int __libc_current_sigrtmin (void)
{
return current_rtmin;
}
/* Return number of available real-time signal with lowest priority. */
int __libc_current_sigrtmax (void)
{
return current_rtmax;
}
/* Allocate real-time signal with highest/lowest available
priority. Please note that we don't use a lock since we assume
this function to be called at program start. */
int __libc_allocate_rtsig (int high);
int __libc_allocate_rtsig (int high)
{
if (current_rtmin == -1 || current_rtmin > current_rtmax)
/* We don't have anymore signal available. */
return -1;
return high ? current_rtmin++ : current_rtmax--;
}
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