Increase internal precision of ldbl-128ibm decimal printf [BZ #19853]
[glibc.git] / signal / allocrtsig.c
blob463e5e3d050839dc4aff4cc29f19962e070a0d5c
1 /* Handle real-time signal allocation. Generic version.
2 Copyright (C) 1997-2016 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/>. */
20 #include <signal.h>
22 /* Another sysdeps file can #define this and then #include this file. */
23 #ifndef RESERVED_SIGRT
24 # define RESERVED_SIGRT 0
25 #endif
27 /* In these variables we keep track of the used variables. If the
28 platform does not support any real-time signals we will define the
29 values to some unreasonable value which will signal failing of all
30 the functions below. */
31 #ifdef __SIGRTMIN
32 static int current_rtmin = __SIGRTMIN + RESERVED_SIGRT;
33 static int current_rtmax = __SIGRTMAX;
34 #endif
36 /* Return number of available real-time signal with highest priority. */
37 int
38 __libc_current_sigrtmin (void)
40 #ifdef __SIGRTMIN
41 return current_rtmin;
42 #else
43 return -1;
44 #endif
46 libc_hidden_def (__libc_current_sigrtmin)
47 strong_alias (__libc_current_sigrtmin, __libc_current_sigrtmin_private)
49 /* Return number of available real-time signal with lowest priority. */
50 int
51 __libc_current_sigrtmax (void)
53 #ifdef __SIGRTMIN
54 return current_rtmax;
55 #else
56 return -1;
57 #endif
59 libc_hidden_def (__libc_current_sigrtmax)
60 strong_alias (__libc_current_sigrtmax, __libc_current_sigrtmax_private)
62 /* Allocate real-time signal with highest/lowest available
63 priority. Please note that we don't use a lock since we assume
64 this function to be called at program start. */
65 int
66 __libc_allocate_rtsig (int high)
68 #ifndef __SIGRTMIN
69 return -1;
70 #else
71 if (current_rtmin == -1 || current_rtmin > current_rtmax)
72 /* We don't have any more signals available. */
73 return -1;
75 return high ? current_rtmin++ : current_rtmax--;
76 #endif
78 strong_alias (__libc_allocate_rtsig, __libc_allocate_rtsig_private)