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authorUlrich Drepper <drepper@redhat.com>2005-12-14 08:43:25 +0000
committerUlrich Drepper <drepper@redhat.com>2005-12-14 08:43:25 +0000
commitb6ab06cef4670e02756bcdd4d2c33a49369a4346 (patch)
treeb30743eb9728d890d1519f62b2d1f2b96f62547a /signal
parentd1dc39a44e339f9c48baa3854fffb3d68c73c8fa (diff)
downloadglibc-b6ab06cef4670e02756bcdd4d2c33a49369a4346.tar.gz
2005-12-13 Ulrich Drepper <drepper@redhat.com>
Diffstat (limited to 'signal')
-rw-r--r--signal/allocrtsig.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/signal/allocrtsig.c b/signal/allocrtsig.c
new file mode 100644
index 0000000000..ac8d2b6bfe
--- /dev/null
+++ b/signal/allocrtsig.c
@@ -0,0 +1,96 @@
+/* Handle real-time signal allocation.
+ Copyright (C) 1997,98,99,2002 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;
+}
+libc_hidden_def (__libc_current_sigrtmin)
+
+/* Return number of available real-time signal with lowest priority. */
+int
+__libc_current_sigrtmax (void)
+{
+#ifdef __SIGRTMIN
+ if (!initialized)
+ init ();
+#endif
+ return current_rtmax;
+}
+libc_hidden_def (__libc_current_sigrtmax)
+
+/* 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
+}