From faa675ad6a598a2a2d56ea24243852c88aea93ca Mon Sep 17 00:00:00 2001 From: Peter Dimov Date: Tue, 5 Apr 2005 20:29:15 +0000 Subject: [PATCH] PowerPC implementations added. [SVN r27986] --- .../boost/detail/sp_counted_base_cw_ppc.hpp | 154 +++++++++++++++ .../boost/detail/sp_counted_base_gcc_ppc.hpp | 181 ++++++++++++++++++ 2 files changed, 335 insertions(+) create mode 100644 include/boost/detail/sp_counted_base_cw_ppc.hpp create mode 100644 include/boost/detail/sp_counted_base_gcc_ppc.hpp diff --git a/include/boost/detail/sp_counted_base_cw_ppc.hpp b/include/boost/detail/sp_counted_base_cw_ppc.hpp new file mode 100644 index 0000000..f937d2a --- /dev/null +++ b/include/boost/detail/sp_counted_base_cw_ppc.hpp @@ -0,0 +1,154 @@ +#ifndef BOOST_DETAIL_SP_COUNTED_BASE_CW_PPC_HPP_INCLUDED +#define BOOST_DETAIL_SP_COUNTED_BASE_CW_PPC_HPP_INCLUDED + +// MS compatible compilers support #pragma once + +#if defined(_MSC_VER) && (_MSC_VER >= 1020) +# pragma once +#endif + +// +// detail/sp_counted_base_cw_ppc.hpp - CodeWarrior 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 + +namespace boost +{ + +namespace detail +{ + +asm void atomic_increment( register long * pw ) +{ +loop: + + lwarx r4, 0, r3 + addi r4, r4, 1 + stwcx. r4, 0, r3 + bne- loop +} + +asm long atomic_decrement( register long * pw ) +{ + sync + +loop: + + lwarx r4, 0, r3 + addi r4, r4, -1 + stwcx. r4, 0, r3 + bne- loop + + mr r3, r4 + + isync +} + +asm long atomic_conditional_increment( register long * pw ) +{ +loop: + + lwarx r4, 0, r3 + cmpwi r4, 0 + beq done + + addi r4, r4, 1 + stwcx. r4, 0, r3 + bne- loop + +done: + + mr r3, r4 +} + +class sp_counted_base +{ +private: + + sp_counted_base( sp_counted_base const & ); + sp_counted_base & operator= ( sp_counted_base const & ); + + long use_count_; // #shared + long 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_, -1 ) == 0 ) + { + dispose(); + weak_release(); + } + } + + void weak_add_ref() // nothrow + { + atomic_increment( &weak_count_ ); + } + + void weak_release() // nothrow + { + if( atomic_decrement( &weak_count_, -1 ) == 0 ) + { + destroy(); + } + } + + long use_count() const // nothrow + { + return static_cast( use_count_ ); + } +}; + +} // namespace detail + +} // namespace boost + +#endif // #ifndef BOOST_DETAIL_SP_COUNTED_BASE_CW_PPC_HPP_INCLUDED diff --git a/include/boost/detail/sp_counted_base_gcc_ppc.hpp b/include/boost/detail/sp_counted_base_gcc_ppc.hpp new file mode 100644 index 0000000..9a6b609 --- /dev/null +++ b/include/boost/detail/sp_counted_base_gcc_ppc.hpp @@ -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 + +namespace boost +{ + +namespace detail +{ + +inline void atomic_increment( long * pw ) +{ + // ++*pw; + + long 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 long atomic_decrement( long * pw ) +{ + // return --*pw; + + long 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 long atomic_conditional_increment( long * pw ) +{ + // if( *pw != 0 ) ++*pw; + // return *pw; + + long 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" + "stwcx. %1, 0, %2\n\t" + "bne- 0b\n\t" + "1:": + + "=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 & ); + + long use_count_; // #shared + long 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_, -1 ) == 0 ) + { + dispose(); + weak_release(); + } + } + + void weak_add_ref() // nothrow + { + atomic_increment( &weak_count_ ); + } + + void weak_release() // nothrow + { + if( atomic_decrement( &weak_count_, -1 ) == 0 ) + { + destroy(); + } + } + + long use_count() const // nothrow + { + return static_cast( use_count_ ); + } +}; + +} // namespace detail + +} // namespace boost + +#endif // #ifndef BOOST_DETAIL_SP_COUNTED_BASE_GCC_PPC_HPP_INCLUDED