1 /* Handle real-time signal allocation.
2 Copyright (C) 1997,98,99,2002 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
23 #if !defined __SIGRTMIN || (__SIGRTMAX - __SIGRTMIN) < 3
24 # error "This must not happen"
27 static int current_rtmin;
28 static int current_rtmax;
30 static int initialized;
32 #include <testrtsig.h>
37 if (!kernel_has_rtsig ())
44 current_rtmin = __SIGRTMIN + 3;
45 current_rtmax = __SIGRTMAX;
50 /* Return number of available real-time signal with highest priority. */
52 __libc_current_sigrtmin (void)
58 strong_alias (__libc_current_sigrtmin, __libc_current_sigrtmin_private)
59 libc_hidden_def (__libc_current_sigrtmin)
61 /* Return number of available real-time signal with lowest priority. */
63 __libc_current_sigrtmax (void)
69 strong_alias (__libc_current_sigrtmax, __libc_current_sigrtmax_private)
70 libc_hidden_def (__libc_current_sigrtmax)
73 /* Allocate real-time signal with highest/lowest available
74 priority. Please note that we don't use a lock since we assume
75 this function to be called at program start. */
77 __libc_allocate_rtsig (int high)
81 if (current_rtmin == -1 || current_rtmin > current_rtmax)
82 /* We don't have anymore signal available. */
85 return high ? current_rtmin++ : current_rtmax--;
87 strong_alias (__libc_allocate_rtsig, __libc_allocate_rtsig_private)