Update copyright years.

[thirdparty/gcc.git] / libstdc++-v3 / config / cpu / i386 / atomicity.h

diff --git a/libstdc++-v3/config/cpu/i386/atomicity.h b/libstdc++-v3/config/cpu/i386/atomicity.h
index 7a949c30fa5ffbc883bccf0c2d3782c778f06309..79d3366818b8de70b4c27d7b36025d56b195d585 100644 (file)
--- a/libstdc++-v3/config/cpu/i386/atomicity.h
+++ b/libstdc++-v3/config/cpu/i386/atomicity.h
@@ -1,11 +1,11 @@
 // Low-level functions for atomic operations: x86, x >= 3 version  -*- C++ -*-
 
-// Copyright (C) 2003 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,
@@ -13,64 +13,61 @@
 // 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 _GLIBCXX_ATOMICITY_H
-#define _GLIBCXX_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)
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
 {
-  register _Atomic_word __result, __tmp = 1;
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
 
-  /* 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);
+  template<int __inst>
+    struct _Atomicity_lock
+    {
+      static volatile _Atomic_word _S_atomicity_lock;
+    };
 
-  __result = *__mem;
-  *__mem += __val;
+  template<int __inst>
+  volatile _Atomic_word _Atomicity_lock<__inst>::_S_atomicity_lock = 0;
 
-  /* release spin lock */
-  __Atomicity_lock<0>::_S_atomicity_lock = 0;
+  template volatile _Atomic_word _Atomicity_lock<0>::_S_atomicity_lock;
 
-  return __result;
-}
-
-static inline void
-__attribute__ ((__unused__))
-__atomic_add(volatile _Atomic_word* __mem, int __val)
-{
-  __exchange_and_add(__mem, __val);
-}
-
-#endif /* atomicity.h */
+  _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