From: pme <pme@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 8 Nov 2002 19:24:41 +0000 (+0000)
Subject: 2002-11-07  Phil Edwards  <pme@gcc.gnu.org>
X-Git-Tag: upstream/4.9.2~83516
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f41d3dfdafdead0723b47be8cebde9fdcee02b9c;p=platform%2Fupstream%2Flinaro-gcc.git

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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@58929 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 4d80309..bf57cd7 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,9 @@
+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
diff --git a/libstdc++-v3/config/cpu/generic/atomicity.h b/libstdc++-v3/config/cpu/generic/atomicity.h
index fca2b83..2cf6c3c 100644
--- a/libstdc++-v3/config/cpu/generic/atomicity.h
+++ b/libstdc++-v3/config/cpu/generic/atomicity.h
@@ -1,6 +1,6 @@
 // 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
@@ -30,22 +30,37 @@
 #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 */