| 1 |
1325 |
phoenix |
/* Handle real-time signal allocation.
|
| 2 |
|
|
Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc.
|
| 3 |
|
|
This file is part of the GNU C Library.
|
| 4 |
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
| 5 |
|
|
|
| 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.
|
| 10 |
|
|
|
| 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.
|
| 15 |
|
|
|
| 16 |
|
|
You should have received a copy of the GNU Lesser General Public
|
| 17 |
|
|
License along with the GNU C Library; if not, write to the Free
|
| 18 |
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
| 19 |
|
|
02111-1307 USA. */
|
| 20 |
|
|
|
| 21 |
|
|
#include <features.h>
|
| 22 |
|
|
#include <signal.h>
|
| 23 |
|
|
#include <sys/types.h>
|
| 24 |
|
|
#include <sys/syscall.h>
|
| 25 |
|
|
|
| 26 |
|
|
/* Only enable rt signals when it is supported at compile time */
|
| 27 |
|
|
#ifndef __NR_rt_sigaction
|
| 28 |
|
|
/* In these variables we keep track of the used variables. If the
|
| 29 |
|
|
platform does not support any real-time signals we will define the
|
| 30 |
|
|
values to some unreasonable value which will signal failing of all
|
| 31 |
|
|
the functions below. */
|
| 32 |
|
|
static int current_rtmin = -1;
|
| 33 |
|
|
static int current_rtmax = -1;
|
| 34 |
|
|
#else
|
| 35 |
|
|
static int current_rtmin = __SIGRTMIN;
|
| 36 |
|
|
static int current_rtmax = __SIGRTMAX;
|
| 37 |
|
|
#endif
|
| 38 |
|
|
|
| 39 |
|
|
/* Return number of available real-time signal with highest priority. */
|
| 40 |
|
|
int __libc_current_sigrtmin (void)
|
| 41 |
|
|
{
|
| 42 |
|
|
return current_rtmin;
|
| 43 |
|
|
}
|
| 44 |
|
|
|
| 45 |
|
|
/* Return number of available real-time signal with lowest priority. */
|
| 46 |
|
|
int __libc_current_sigrtmax (void)
|
| 47 |
|
|
{
|
| 48 |
|
|
return current_rtmax;
|
| 49 |
|
|
}
|
| 50 |
|
|
|
| 51 |
|
|
/* Allocate real-time signal with highest/lowest available
|
| 52 |
|
|
priority. Please note that we don't use a lock since we assume
|
| 53 |
|
|
this function to be called at program start. */
|
| 54 |
|
|
int __libc_allocate_rtsig (int high)
|
| 55 |
|
|
{
|
| 56 |
|
|
if (current_rtmin == -1 || current_rtmin > current_rtmax)
|
| 57 |
|
|
/* We don't have anymore signal available. */
|
| 58 |
|
|
return -1;
|
| 59 |
|
|
|
| 60 |
|
|
return high ? current_rtmin++ : current_rtmax--;
|
| 61 |
|
|
}
|
