nptl/sysdeps/unix/sysv/linux/allocrtsig.c

   1 /* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <signal.h>
  21
  22
  23 static int current_rtmin = __SIGRTMIN + 2;
  24 static int current_rtmax = __SIGRTMAX;
  25
  26
  27 /* We reserve __SIGRTMIN for use as the cancelation signal.  This
  28    signal is used internally.  */
  29 int
  30 __libc_current_sigrtmin (void)
  31 {
  32   return current_rtmin;
  33 }
  34 libc_hidden_def (__libc_current_sigrtmin)
  35 strong_alias (__libc_current_sigrtmin, __libc_current_sigrtmin_private)
  36
  37
  38 int
  39 __libc_current_sigrtmax (void)
  40 {
  41   return current_rtmax;
  42 }
  43 libc_hidden_def (__libc_current_sigrtmax)
  44 strong_alias (__libc_current_sigrtmax, __libc_current_sigrtmax_private)
  45
  46
  47 int
  48 __libc_allocate_rtsig (int high)
  49 {
  50   if (current_rtmin == -1 || current_rtmin > current_rtmax)
  51     /* We don't have anymore signal available.  */
  52     return -1;
  53
  54   return high ? current_rtmin++ : current_rtmax--;
  55 }
  56 strong_alias (__libc_allocate_rtsig, __libc_allocate_rtsig_private)