mirror of
https://github.com/yuzu-emu/ext-boost.git
synced 2024-12-23 07:25:38 +00:00
170 lines
3.5 KiB
C++
170 lines
3.5 KiB
C++
#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_GCC_SPARC_HPP_INCLUDED
|
|
#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_GCC_SPARC_HPP_INCLUDED
|
|
|
|
// MS compatible compilers support #pragma once
|
|
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
|
|
# pragma once
|
|
#endif
|
|
|
|
// detail/sp_counted_base_gcc_sparc.hpp - g++ on Sparc V8+
|
|
//
|
|
// Copyright (c) 2006 Piotr Wyderski
|
|
// Copyright (c) 2006 Tomas Puverle
|
|
// Copyright (c) 2006 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
|
|
//
|
|
// Thanks to Michael van der Westhuizen
|
|
|
|
#include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
|
|
#include <boost/config.hpp>
|
|
#include <inttypes.h> // int32_t
|
|
|
|
namespace boost
|
|
{
|
|
|
|
namespace detail
|
|
{
|
|
|
|
inline int32_t compare_and_swap( int32_t * dest_, int32_t compare_, int32_t swap_ )
|
|
{
|
|
__asm__ __volatile__( "cas [%1], %2, %0"
|
|
: "+r" (swap_)
|
|
: "r" (dest_), "r" (compare_)
|
|
: "memory" );
|
|
|
|
return swap_;
|
|
}
|
|
|
|
inline int32_t atomic_fetch_and_add( int32_t * pw, int32_t dv )
|
|
{
|
|
// long r = *pw;
|
|
// *pw += dv;
|
|
// return r;
|
|
|
|
for( ;; )
|
|
{
|
|
int32_t r = *pw;
|
|
|
|
if( __builtin_expect((compare_and_swap(pw, r, r + dv) == r), 1) )
|
|
{
|
|
return r;
|
|
}
|
|
}
|
|
}
|
|
|
|
inline void atomic_increment( int32_t * pw )
|
|
{
|
|
atomic_fetch_and_add( pw, 1 );
|
|
}
|
|
|
|
inline int32_t atomic_decrement( int32_t * pw )
|
|
{
|
|
return atomic_fetch_and_add( pw, -1 );
|
|
}
|
|
|
|
inline int32_t atomic_conditional_increment( int32_t * pw )
|
|
{
|
|
// long r = *pw;
|
|
// if( r != 0 ) ++*pw;
|
|
// return r;
|
|
|
|
for( ;; )
|
|
{
|
|
int32_t r = *pw;
|
|
|
|
if( r == 0 )
|
|
{
|
|
return r;
|
|
}
|
|
|
|
if( __builtin_expect( ( compare_and_swap( pw, r, r + 1 ) == r ), 1 ) )
|
|
{
|
|
return r;
|
|
}
|
|
}
|
|
}
|
|
|
|
class BOOST_SYMBOL_VISIBLE sp_counted_base
|
|
{
|
|
private:
|
|
|
|
sp_counted_base( sp_counted_base const & );
|
|
sp_counted_base & operator= ( sp_counted_base const & );
|
|
|
|
int32_t use_count_; // #shared
|
|
int32_t 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;
|
|
virtual void * get_local_deleter( sp_typeinfo_ const & ti ) = 0;
|
|
virtual void * get_untyped_deleter() = 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_ ) == 1 )
|
|
{
|
|
dispose();
|
|
weak_release();
|
|
}
|
|
}
|
|
|
|
void weak_add_ref() // nothrow
|
|
{
|
|
atomic_increment( &weak_count_ );
|
|
}
|
|
|
|
void weak_release() // nothrow
|
|
{
|
|
if( atomic_decrement( &weak_count_ ) == 1 )
|
|
{
|
|
destroy();
|
|
}
|
|
}
|
|
|
|
long use_count() const // nothrow
|
|
{
|
|
return const_cast< int32_t const volatile & >( use_count_ );
|
|
}
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
} // namespace boost
|
|
|
|
#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_GCC_SPARC_HPP_INCLUDED
|