--- /dev/null
+/* Low-level functions for atomic operations. PA-RISC version. -*- C++ -*-
+ Copyright 2002 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ 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.
+
+ 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.
+
+ 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. */
+
+#ifndef _BITS_ATOMICITY_H
+#define _BITS_ATOMICITY_H 1
+
+typedef int _Atomic_word;
+
+template <int __inst>
+struct __Atomicity_lock
+{
+ static volatile int __attribute__ ((aligned (16))) _S_atomicity_lock;
+};
+
+template <int __inst>
+volatile int __Atomicity_lock<__inst>::_S_atomicity_lock = 1;
+
+/* Because of the lack of weak support when using the hpux
+ som linker, we explicitly instantiate the atomicity lock
+ in src/misc-inst.cc when _GLIBCPP_INST_ATOMICITY_LOCK
+ is defined. */
+#ifndef _GLIBCPP_INST_ATOMICITY_LOCK
+template volatile int __Atomicity_lock<0>::_S_atomicity_lock;
+#endif
+
+static inline int
+__attribute__ ((__unused__))
+__exchange_and_add (volatile _Atomic_word* __mem, int __val)
+{
+ _Atomic_word result;
+ int tmp;
+ volatile int& lock = __Atomicity_lock<0>::_S_atomicity_lock;
+
+ __asm__ __volatile__ ("ldcw 0(%1),%0\n\t"
+ "cmpib,<>,n 0,%0,.+20\n\t"
+ "ldw 0(%1),%0\n\t"
+ "cmpib,= 0,%0,.-4\n\t"
+ "nop\n\t"
+ "b,n .-20"
+ : "=&r" (tmp)
+ : "r" (&lock));
+
+ result = *__mem;
+ *__mem = result + __val;
+ __asm__ __volatile__("");
+ lock = tmp;
+ return result;
+}
+
+static inline void
+__attribute__ ((__unused__))
+__atomic_add (_Atomic_word* __mem, int __val)
+{
+ int tmp;
+ volatile int& lock = __Atomicity_lock<0>::_S_atomicity_lock;
+
+ __asm__ __volatile__ ("ldcw 0(%1),%0\n\t"
+ "cmpib,<>,n 0,%0,.+20\n\t"
+ "ldw 0(%1),%0\n\t"
+ "cmpib,= 0,%0,.-4\n\t"
+ "nop\n\t"
+ "b,n .-20"
+ : "=&r" (tmp)
+ : "r" (&lock));
+
+ *__mem += __val;
+ __asm__ __volatile__("");
+ lock = tmp;
+}
+
+#endif