95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/* 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 <signal.h>
|
|
|
|
/* 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. */
|
|
#ifndef __SIGRTMIN
|
|
static int current_rtmin = -1;
|
|
static int current_rtmax = -1;
|
|
#else
|
|
static int current_rtmin;
|
|
static int current_rtmax;
|
|
|
|
static int initialized;
|
|
|
|
#include "testrtsig.h"
|
|
|
|
static void
|
|
init (void)
|
|
{
|
|
if (!kernel_has_rtsig ())
|
|
{
|
|
current_rtmin = -1;
|
|
current_rtmax = -1;
|
|
}
|
|
else
|
|
{
|
|
current_rtmin = __SIGRTMIN;
|
|
current_rtmax = __SIGRTMAX;
|
|
}
|
|
initialized = 1;
|
|
}
|
|
#endif
|
|
|
|
/* Return number of available real-time signal with highest priority. */
|
|
int
|
|
__libc_current_sigrtmin (void)
|
|
{
|
|
#ifdef __SIGRTMIN
|
|
if (!initialized)
|
|
init ();
|
|
#endif
|
|
return current_rtmin;
|
|
}
|
|
|
|
/* Return number of available real-time signal with lowest priority. */
|
|
int
|
|
__libc_current_sigrtmax (void)
|
|
{
|
|
#ifdef __SIGRTMIN
|
|
if (!initialized)
|
|
init ();
|
|
#endif
|
|
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)
|
|
{
|
|
#ifndef __SIGRTMIN
|
|
return -1;
|
|
#else
|
|
if (!initialized)
|
|
init ();
|
|
if (current_rtmin == -1 || current_rtmin > current_rtmax)
|
|
/* We don't have anymore signal available. */
|
|
return -1;
|
|
|
|
return high ? current_rtmin++ : current_rtmax--;
|
|
#endif
|
|
}
|