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[thirdparty/glibc.git] / signal / allocrtsig.c

diff --git a/signal/allocrtsig.c b/signal/allocrtsig.c
index 678bc8b17b9b77a7082d10119268664149320c04..4de4191e1ea9a6d24bfd6e218f61ca42998bf8b4 100644 (file)
--- a/signal/allocrtsig.c
+++ b/signal/allocrtsig.c
@@ -1,50 +1,36 @@
-/* Handle real-time signal allocation.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+/* Handle real-time signal allocation.  Generic version.
+   Copyright (C) 1997-2019 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 Library General Public License as
-   published by the Free Software Foundation; either version 2 of the
-   License, or (at your option) any later version.
+   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
-   Library General Public License for more details.
+   Lesser General Public License for more details.
 
-   You should have received a copy of the GNU Library General Public
-   License along with the GNU C Library; see the file COPYING.LIB.  If not,
-   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
 
 #include <signal.h>
 
+/* Another sysdeps file can #define this and then #include this file.  */
+#ifndef RESERVED_SIGRT
+# define RESERVED_SIGRT 0
+#endif
+
 /* 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 = __SIGRTMIN;
+#ifdef __SIGRTMIN
+static int current_rtmin = __SIGRTMIN + RESERVED_SIGRT;
 static int current_rtmax = __SIGRTMAX;
-
-static int initialized;
-
-#include "testrtsig.h"
-
-static void
-init (void)
-{
-  if (!kernel_has_rtsig ())
-    {
-      current_rtmin = -1;
-      current_rtmax = -1;
-    }
-  initialized = 1;
-}
 #endif
 
 /* Return number of available real-time signal with highest priority.  */
@@ -52,22 +38,26 @@ int
 __libc_current_sigrtmin (void)
 {
 #ifdef __SIGRTMIN
-  if (!initialized)
-    init ();
-#endif
   return current_rtmin;
+#else
+  return -1;
+#endif
 }
+libc_hidden_def (__libc_current_sigrtmin)
+strong_alias (__libc_current_sigrtmin, __libc_current_sigrtmin_private)
 
 /* Return number of available real-time signal with lowest priority.  */
 int
 __libc_current_sigrtmax (void)
 {
 #ifdef __SIGRTMIN
-  if (!initialized)
-    init ();
-#endif
   return current_rtmax;
+#else
+  return -1;
+#endif
 }
+libc_hidden_def (__libc_current_sigrtmax)
+strong_alias (__libc_current_sigrtmax, __libc_current_sigrtmax_private)
 
 /* Allocate real-time signal with highest/lowest available
    priority.  Please note that we don't use a lock since we assume
@@ -78,12 +68,11 @@ __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.  */
+  if (current_rtmin == -1 || current_rtmin > current_rtmax)
+    /* We don't have any more signals available.  */
     return -1;
 
   return high ? current_rtmin++ : current_rtmax--;
 #endif
 }
+strong_alias (__libc_allocate_rtsig, __libc_allocate_rtsig_private)