blob: 2102a15baad3d3705010f826e8b6ab037fea1bfd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
/* 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <features.h>
#include <signal.h>
#include <sys/types.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
static int current_rtmin = __SIGRTMIN;
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;
}
/* 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)
{
if (current_rtmin == -1 || current_rtmin > current_rtmax)
/* We don't have anymore signal available. */
return -1;
return high ? current_rtmin++ : current_rtmax--;
}
|
