// Low-level functions for atomic operations: x86, x >= 3 version -*- C++ -*-
-// Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+// Copyright (C) 2003-2024 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
-// 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/>.
#include <ext/atomicity.h>
-_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
template<int __inst>
struct _Atomicity_lock
volatile _Atomic_word _Atomicity_lock<__inst>::_S_atomicity_lock = 0;
template volatile _Atomic_word _Atomicity_lock<0>::_S_atomicity_lock;
-
- _Atomic_word
+
+ _Atomic_word
__attribute__ ((__unused__))
- __exchange_and_add(volatile _Atomic_word* __mem, int __val)
+ __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()
{
register _Atomic_word __result, __tmp = 1;
-
+
// Obtain the atomic exchange/add spin lock.
- do
+ 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)
+ __atomic_add(volatile _Atomic_word* __mem, int __val) throw ()
{ __exchange_and_add(__mem, __val); }
-_GLIBCXX_END_NAMESPACE
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace