+2002-11-07 Phil Edwards <pme@gcc.gnu.org>
+ Richard Earnshaw <rearnsha@arm.com>
+
+ * config/cpu/generic/atomicity.h: Provide atomic __exchange_and_add
+ and __atomic_add.
+
2002-11-08 Paolo Carlini <pcarlini@unitus.it>
* config/locale/gnu/monetary_members.cc
// Low-level functions for atomic operations: Generic version -*- C++ -*-
-// Copyright (C) 1999, 2001 Free Software Foundation, Inc.
+// Copyright (C) 1999, 2001, 2002 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
#ifndef _BITS_ATOMICITY_H
#define _BITS_ATOMICITY_H 1
+#include <bits/gthr.h>
+
typedef int _Atomic_word;
+namespace __gnu_cxx
+{
+ __gthread_mutex_t _Atomic_add_mutex __attribute__ ((__weak__))
+ = __GTHREAD_MUTEX_INIT;
+}
+
static inline _Atomic_word
__attribute__ ((__unused__))
-__exchange_and_add (_Atomic_word* __mem, int __val)
+__exchange_and_add (volatile _Atomic_word* __mem, int __val)
{
- _Atomic_word __result = *__mem;
- *__mem += __val;
+ _Atomic_word __result;
+
+ __gthread_mutex_lock (&__gnu_cxx::_Atomic_add_mutex);
+
+ __result = *__mem;
+ *__mem += __val;
+
+ __gthread_mutex_unlock (&__gnu_cxx::_Atomic_add_mutex);
return __result;
}
+
static inline void
__attribute__ ((__unused__))
-__atomic_add (_Atomic_word* __mem, int __val)
+__atomic_add (volatile _Atomic_word* __mem, int __val)
{
- *__mem += __val;
+ (void) __exchange_and_add (__mem, __val);
}
#endif /* atomicity.h */