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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, see
- <http://www.gnu.org/licenses/>. */
- #include <features.h>
- #include <signal.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;
- }
- #if 0
- /* 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--;
- }
- #endif
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