cpp-d1064d

[cross.git] / i686-linux-gnu-4.7 / usr / include / c++ / 4.7 / ext / atomicity.h

diff --git a/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/atomicity.h b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/atomicity.h
new file mode 100644 (file)
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+++ b/i686-linux-gnu-4.7/usr/include/c++/4.7/ext/atomicity.h
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+// Support for atomic operations -*- C++ -*-
+
+// Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010, 2011, 2012
+// 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 3, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// 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.
+
+// 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/>.
+
+/** @file ext/atomicity.h
+ *  This file is a GNU extension to the Standard C++ Library.
+ */
+
+#ifndef _GLIBCXX_ATOMICITY_H
+#define _GLIBCXX_ATOMICITY_H   1
+
+#include <bits/c++config.h>
+#include <bits/gthr.h>
+#include <bits/atomic_word.h>
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  // Functions for portable atomic access.
+  // To abstract locking primitives across all thread policies, use:
+  // __exchange_and_add_dispatch
+  // __atomic_add_dispatch
+#ifdef _GLIBCXX_ATOMIC_BUILTINS
+  static inline _Atomic_word 
+  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
+  { return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); }
+
+  static inline void
+  __atomic_add(volatile _Atomic_word* __mem, int __val)
+  { __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL); }
+#else
+  _Atomic_word
+  __attribute__ ((__unused__))
+  __exchange_and_add(volatile _Atomic_word*, int) throw ();
+
+  void
+  __attribute__ ((__unused__))
+  __atomic_add(volatile _Atomic_word*, int) throw ();
+#endif
+
+  static inline _Atomic_word
+  __exchange_and_add_single(_Atomic_word* __mem, int __val)
+  {
+    _Atomic_word __result = *__mem;
+    *__mem += __val;
+    return __result;
+  }
+
+  static inline void
+  __atomic_add_single(_Atomic_word* __mem, int __val)
+  { *__mem += __val; }
+
+  static inline _Atomic_word
+  __attribute__ ((__unused__))
+  __exchange_and_add_dispatch(_Atomic_word* __mem, int __val)
+  {
+#ifdef __GTHREADS
+    if (__gthread_active_p())
+      return __exchange_and_add(__mem, __val);
+    else
+      return __exchange_and_add_single(__mem, __val);
+#else
+    return __exchange_and_add_single(__mem, __val);
+#endif
+  }
+
+  static inline void
+  __attribute__ ((__unused__))
+  __atomic_add_dispatch(_Atomic_word* __mem, int __val)
+  {
+#ifdef __GTHREADS
+    if (__gthread_active_p())
+      __atomic_add(__mem, __val);
+    else
+      __atomic_add_single(__mem, __val);
+#else
+    __atomic_add_single(__mem, __val);
+#endif
+  }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+// Even if the CPU doesn't need a memory barrier, we need to ensure
+// that the compiler doesn't reorder memory accesses across the
+// barriers.
+#ifndef _GLIBCXX_READ_MEM_BARRIER
+#define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("":::"memory")
+#endif
+#ifndef _GLIBCXX_WRITE_MEM_BARRIER
+#define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("":::"memory")
+#endif
+
+#endif