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glibc  2.9
allocrtsig.c
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00001 /* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <signal.h>
00021 
00022 
00023 static int current_rtmin = __SIGRTMIN + 2;
00024 static int current_rtmax = __SIGRTMAX;
00025 
00026 
00027 /* We reserve __SIGRTMIN for use as the cancelation signal.  This
00028    signal is used internally.  */
00029 int
00030 __libc_current_sigrtmin (void)
00031 {
00032   return current_rtmin;
00033 }
00034 libc_hidden_def (__libc_current_sigrtmin)
00035 strong_alias (__libc_current_sigrtmin, __libc_current_sigrtmin_private)
00036 
00037 
00038 int
00039 __libc_current_sigrtmax (void)
00040 {
00041   return current_rtmax;
00042 }
00043 libc_hidden_def (__libc_current_sigrtmax)
00044 strong_alias (__libc_current_sigrtmax, __libc_current_sigrtmax_private)
00045 
00046 
00047 int
00048 __libc_allocate_rtsig (int high)
00049 {
00050   if (current_rtmin == -1 || current_rtmin > current_rtmax)
00051     /* We don't have anymore signal available.  */
00052     return -1;
00053 
00054   return high ? current_rtmin++ : current_rtmax--;
00055 }
00056 strong_alias (__libc_allocate_rtsig, __libc_allocate_rtsig_private)