]> https://gitweb.dealii.org/ - dealii-svn.git/commitdiff
Required for Mac 10.3
authorhartmann <hartmann@0785d39b-7218-0410-832d-ea1e28bc413d>
Fri, 3 Mar 2006 07:45:22 +0000 (07:45 +0000)
committerhartmann <hartmann@0785d39b-7218-0410-832d-ea1e28bc413d>
Fri, 3 Mar 2006 07:45:22 +0000 (07:45 +0000)
git-svn-id: https://svn.dealii.org/trunk@12528 0785d39b-7218-0410-832d-ea1e28bc413d

deal.II/contrib/boost/include/boost/detail/sp_counted_base_gcc_ppc.hpp [new file with mode: 0644]

diff --git a/deal.II/contrib/boost/include/boost/detail/sp_counted_base_gcc_ppc.hpp b/deal.II/contrib/boost/include/boost/detail/sp_counted_base_gcc_ppc.hpp
new file mode 100644 (file)
index 0000000..fc2925e
--- /dev/null
@@ -0,0 +1,181 @@
+#ifndef BOOST_DETAIL_SP_COUNTED_BASE_GCC_PPC_HPP_INCLUDED
+#define BOOST_DETAIL_SP_COUNTED_BASE_GCC_PPC_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  detail/sp_counted_base_gcc_ppc.hpp - g++ on PowerPC
+//
+//  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
+//  Copyright 2004-2005 Peter Dimov
+//
+//  Distributed under the Boost Software License, Version 1.0. (See
+//  accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt)
+//
+//
+//  Lock-free algorithm by Alexander Terekhov
+//
+//  Thanks to Ben Hitchings for the #weak + (#shared != 0)
+//  formulation
+//
+
+#include <typeinfo>
+
+namespace boost
+{
+
+namespace detail
+{
+
+inline void atomic_increment( int * pw )
+{
+    // ++*pw;
+
+    int tmp;
+
+    __asm__
+    (
+        "0:\n\t"
+        "lwarx %1, 0, %2\n\t"
+        "addi %1, %1, 1\n\t"
+        "stwcx. %1, 0, %2\n\t"
+        "bne- 0b":
+
+        "=m"( *pw ), "=&b"( tmp ):
+        "r"( pw ):
+        "cc"
+    );
+}
+
+inline int atomic_decrement( int * pw )
+{
+    // return --*pw;
+
+    int rv;
+
+    __asm__ __volatile__
+    (
+        "sync\n\t"
+        "0:\n\t"
+        "lwarx %1, 0, %2\n\t"
+        "addi %1, %1, -1\n\t"
+        "stwcx. %1, 0, %2\n\t"
+        "bne- 0b\n\t"
+        "isync":
+
+        "=m"( *pw ), "=&b"( rv ):
+        "r"( pw ):
+        "memory", "cc"
+    );
+
+    return rv;
+}
+
+inline int atomic_conditional_increment( int * pw )
+{
+    // if( *pw != 0 ) ++*pw;
+    // return *pw;
+
+    int rv;
+
+    __asm__
+    (
+        "0:\n\t"
+        "lwarx %1, 0, %2\n\t"
+        "cmpwi %1, 0\n\t"
+        "beq 1f\n\t"
+        "addi %1, %1, 1\n\t"
+        "1:\n\t"
+        "stwcx. %1, 0, %2\n\t"
+        "bne- 0b":
+
+        "=m"( *pw ), "=&b"( rv ):
+        "r"( pw ):
+        "cc"
+    );
+
+    return rv;
+}
+
+class sp_counted_base
+{
+private:
+
+    sp_counted_base( sp_counted_base const & );
+    sp_counted_base & operator= ( sp_counted_base const & );
+
+    int use_count_;        // #shared
+    int weak_count_;       // #weak + (#shared != 0)
+
+public:
+
+    sp_counted_base(): use_count_( 1 ), weak_count_( 1 )
+    {
+    }
+
+    virtual ~sp_counted_base() // nothrow
+    {
+    }
+
+    // dispose() is called when use_count_ drops to zero, to release
+    // the resources managed by *this.
+
+    virtual void dispose() = 0; // nothrow
+
+    // destroy() is called when weak_count_ drops to zero.
+
+    virtual void destroy() // nothrow
+    {
+        delete this;
+    }
+
+    virtual void * get_deleter( std::type_info const & ti ) = 0;
+
+    void add_ref_copy()
+    {
+        atomic_increment( &use_count_ );
+    }
+
+    bool add_ref_lock() // true on success
+    {
+        return atomic_conditional_increment( &use_count_ ) != 0;
+    }
+
+    void release() // nothrow
+    {
+        if( atomic_decrement( &use_count_ ) == 0 )
+        {
+            dispose();
+            weak_release();
+        }
+    }
+
+    void weak_add_ref() // nothrow
+    {
+        atomic_increment( &weak_count_ );
+    }
+
+    void weak_release() // nothrow
+    {
+        if( atomic_decrement( &weak_count_ ) == 0 )
+        {
+            destroy();
+        }
+    }
+
+    long use_count() const // nothrow
+    {
+        return static_cast<int const volatile &>( use_count_ );
+    }
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_DETAIL_SP_COUNTED_BASE_GCC_PPC_HPP_INCLUDED

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