// Low-level functions for atomic operations: x86, x >= 3 version -*- C++ -*-
-// Copyright (C) 2003, 2004, 2005, 2009 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
#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) 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) throw ()
{ __exchange_and_add(__mem, __val); }
-_GLIBCXX_END_NAMESPACE
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace