Merge [51978], [51985] to release. Closes #2885.

[SVN r52016]

include/boost/smart_ptr/detail/sp_counted_base.hpp

@@ -47,6 +47,9 @@
 #elif defined( __GNUC__ ) && ( defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc ) )
 # include <boost/smart_ptr/detail/sp_counted_base_gcc_ppc.hpp>
 
+#elif defined( __GNUC__ ) && ( defined( __mips__ ) || defined( _mips ) )
+# include <boost/smart_ptr/detail/sp_counted_base_gcc_mips.hpp>
+
 #elif defined( BOOST_SP_HAS_SYNC )
 # include <boost/smart_ptr/detail/sp_counted_base_sync.hpp>
 

include/boost/smart_ptr/detail/sp_counted_base_gcc_mips.hpp

@@ -0,0 +1,172 @@
+#ifndef BOOST_DETAIL_SP_COUNTED_BASE_GCC_MIPS_HPP_INCLUDED
+#define BOOST_DETAIL_SP_COUNTED_BASE_GCC_MIPS_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  detail/sp_counted_base_gcc_mips.hpp - g++ on MIPS
+//
+//  Copyright (c) 2009, Spirent Communications, Inc.
+//
+//  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
+//
+
+#include <boost/detail/sp_typeinfo.hpp>
+
+namespace boost
+{
+
+namespace detail
+{
+
+inline void atomic_increment( int * pw )
+{
+    // ++*pw;
+
+    int tmp;
+
+    __asm__ __volatile__
+    (
+        "0:\n\t"
+        "ll %0, %1\n\t"
+        "addiu %0, 1\n\t"
+        "sc %0, %1\n\t"
+        "beqz %0, 0b":
+        "=&r"( tmp ), "=m"( *pw ):
+        "m"( *pw )
+    );
+}
+
+inline int atomic_decrement( int * pw )
+{
+    // return --*pw;
+
+    int rv, tmp;
+
+    __asm__ __volatile__
+    (
+        "0:\n\t"
+        "ll %1, %2\n\t"
+        "addiu %0, %1, -1\n\t"
+        "sc %0, %2\n\t"
+        "beqz %0, 0b\n\t"
+        "addiu %0, %1, -1":
+        "=&r"( rv ), "=&r"( tmp ), "=m"( *pw ):
+        "m"( *pw ):
+        "memory"
+    );
+
+    return rv;
+}
+
+inline int atomic_conditional_increment( int * pw )
+{
+    // if( *pw != 0 ) ++*pw;
+    // return *pw;
+
+    int rv, tmp;
+
+    __asm__ __volatile__
+    (
+        "0:\n\t"
+        "ll %0, %2\n\t"
+        "beqz %0, 1f\n\t"
+        "addiu %1, %0, 1\n\t"
+        "sc %1, %2\n\t"
+        "beqz %1, 0b\n\t"
+        "addiu %0, %0, 1\n\t"
+        "1:":
+        "=&r"( rv ), "=&r"( tmp ), "=m"( *pw ):
+        "m"( *pw ):
+        "memory"
+    );
+
+    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( sp_typeinfo 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_MIPS_HPP_INCLUDED