// Low-level functions for atomic operations: x86, x >= 3 version -*- C++ -*-
-// Copyright (C) 2003 Free Software Foundation, Inc.
+// Copyright (C) 2003-2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
-// Free Software Foundation; either version 2, or (at your option)
+// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
-// You should have received a copy of the GNU General Public License along
-// with this library; see the file COPYING. If not, write to the Free
-// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-// USA.
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
-// As a special exception, you may use this file as part of a free software
-// library without restriction. Specifically, if other files instantiate
-// templates or use macros or inline functions from this file, or you compile
-// this file and link it with other files to produce an executable, this
-// file does not by itself cause the resulting executable to be covered by
-// the GNU General Public License. This exception does not however
-// invalidate any other reasons why the executable file might be covered by
-// the GNU General Public License.
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
-#ifndef _BITS_ATOMICITY_H
-#define _BITS_ATOMICITY_H 1
+#include <ext/atomicity.h>
-typedef int _Atomic_word;
-
-template <int __inst>
-struct __Atomicity_lock
-{
- static volatile _Atomic_word _S_atomicity_lock;
-};
-
-template <int __inst>
-volatile _Atomic_word __Atomicity_lock<__inst>::_S_atomicity_lock = 0;
-
-template volatile _Atomic_word __Atomicity_lock<0>::_S_atomicity_lock;
-
-static inline _Atomic_word
-__attribute__ ((__unused__))
-__exchange_and_add (volatile _Atomic_word *__mem, int __val)
-{
- register _Atomic_word __result, __tmp = 1;
-
- /* obtain the atomic exchange/add spin lock */
- do {
- __asm__ __volatile__ ("xchg{l} {%0,%1|%1,%0}"
- : "+m" (__Atomicity_lock<0>::_S_atomicity_lock),
- "+r" (__tmp));
- } while (__tmp);
-
- __result = *__mem;
- *__mem += __val;
-
- /* release spin lock */
- __Atomicity_lock<0>::_S_atomicity_lock = 0;
-
- return __result;
-}
-
-static inline void
-__attribute__ ((__unused__))
-__atomic_add (volatile _Atomic_word* __mem, int __val)
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
- __exchange_and_add (__mem, __val);
-}
-
-#endif /* atomicity.h */
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ template<int __inst>
+ struct _Atomicity_lock
+ {
+ static volatile _Atomic_word _S_atomicity_lock;
+ };
+
+ template<int __inst>
+ volatile _Atomic_word _Atomicity_lock<__inst>::_S_atomicity_lock = 0;
+
+ template volatile _Atomic_word _Atomicity_lock<0>::_S_atomicity_lock;
+
+ _Atomic_word
+ __attribute__ ((__unused__))
+ __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()
+ {
+ register _Atomic_word __result, __tmp = 1;
+
+ // Obtain the atomic exchange/add spin lock.
+ do
+ {
+ __asm__ __volatile__ ("xchg{l} {%0,%1|%1,%0}"
+ : "=m" (_Atomicity_lock<0>::_S_atomicity_lock),
+ "+r" (__tmp)
+ : "m" (_Atomicity_lock<0>::_S_atomicity_lock));
+ }
+ while (__tmp);
+
+ __result = *__mem;
+ *__mem += __val;
+
+ // Release spin lock.
+ _Atomicity_lock<0>::_S_atomicity_lock = 0;
+
+ return __result;
+ }
+
+ void
+ __attribute__ ((__unused__))
+ __atomic_add(volatile _Atomic_word* __mem, int __val) throw ()
+ { __exchange_and_add(__mem, __val); }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace