Swiftdiff options
Diffstat (limited to '3rdParty/Boost/src/boost/smart_ptr/detail/atomic_count.hpp')
| -rw-r--r-- | 3rdParty/Boost/src/boost/smart_ptr/detail/atomic_count.hpp | 95 |
1 files changed, 36 insertions, 59 deletions
diff --git a/3rdParty/Boost/src/boost/smart_ptr/detail/atomic_count.hpp b/3rdParty/Boost/src/boost/smart_ptr/detail/atomic_count.hpp index cc44ac2..8aefd44 100644 --- a/3rdParty/Boost/src/boost/smart_ptr/detail/atomic_count.hpp +++ b/3rdParty/Boost/src/boost/smart_ptr/detail/atomic_count.hpp @@ -11,10 +11,11 @@ // boost/detail/atomic_count.hpp - thread/SMP safe reference counter // // Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd. +// Copyright (c) 2013 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) +// 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 // // typedef <implementation-defined> boost::detail::atomic_count; // @@ -27,92 +28,68 @@ // a; // // Returns: (long) the current value of a +// Memory Ordering: acquire // // ++a; // // Effects: Atomically increments the value of a // Returns: (long) the new value of a +// Memory Ordering: acquire/release // // --a; // // Effects: Atomically decrements the value of a // Returns: (long) the new value of a -// -// Important note: when --a returns zero, it must act as a -// read memory barrier (RMB); i.e. the calling thread must -// have a synchronized view of the memory -// -// On Intel IA-32 (x86) memory is always synchronized, so this -// is not a problem. -// -// On many architectures the atomic instructions already act as -// a memory barrier. -// -// This property is necessary for proper reference counting, since -// a thread can update the contents of a shared object, then -// release its reference, and another thread may immediately -// release the last reference causing object destruction. -// -// The destructor needs to have a synchronized view of the -// object to perform proper cleanup. -// -// Original example by Alexander Terekhov: -// -// Given: -// -// - a mutable shared object OBJ; -// - two threads THREAD1 and THREAD2 each holding -// a private smart_ptr object pointing to that OBJ. -// -// t1: THREAD1 updates OBJ (thread-safe via some synchronization) -// and a few cycles later (after "unlock") destroys smart_ptr; -// -// t2: THREAD2 destroys smart_ptr WITHOUT doing any synchronization -// with respect to shared mutable object OBJ; OBJ destructors -// are called driven by smart_ptr interface... +// Memory Ordering: acquire/release // #include <boost/config.hpp> #include <boost/smart_ptr/detail/sp_has_sync.hpp> -#ifndef BOOST_HAS_THREADS +#if defined( BOOST_AC_DISABLE_THREADS ) +# include <boost/smart_ptr/detail/atomic_count_nt.hpp> -namespace boost -{ +#elif defined( BOOST_AC_USE_STD_ATOMIC ) +# include <boost/smart_ptr/detail/atomic_count_std_atomic.hpp> -namespace detail -{ +#elif defined( BOOST_AC_USE_SPINLOCK ) +# include <boost/smart_ptr/detail/atomic_count_spin.hpp> -typedef long atomic_count; +#elif defined( BOOST_AC_USE_PTHREADS ) +# include <boost/smart_ptr/detail/atomic_count_pt.hpp> -} +#elif defined( BOOST_SP_DISABLE_THREADS ) +# include <boost/smart_ptr/detail/atomic_count_nt.hpp> -} +#elif defined( BOOST_SP_USE_STD_ATOMIC ) +# include <boost/smart_ptr/detail/atomic_count_std_atomic.hpp> -#elif defined(BOOST_AC_USE_PTHREADS) -# include <boost/smart_ptr/detail/atomic_count_pthreads.hpp> +#elif defined( BOOST_SP_USE_SPINLOCK ) +# include <boost/smart_ptr/detail/atomic_count_spin.hpp> -#elif defined( __GNUC__ ) && ( defined( __i386__ ) || defined( __x86_64__ ) ) -# include <boost/smart_ptr/detail/atomic_count_gcc_x86.hpp> +#elif defined( BOOST_SP_USE_PTHREADS ) +# include <boost/smart_ptr/detail/atomic_count_pt.hpp> -#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) -# include <boost/smart_ptr/detail/atomic_count_win32.hpp> +#elif defined( BOOST_DISABLE_THREADS ) && !defined( BOOST_SP_ENABLE_THREADS ) && !defined( BOOST_DISABLE_WIN32 ) +# include <boost/smart_ptr/detail/atomic_count_nt.hpp> + +#elif defined( __GNUC__ ) && ( defined( __i386__ ) || defined( __x86_64__ ) ) && !defined( __PATHSCALE__ ) +# include <boost/smart_ptr/detail/atomic_count_gcc_x86.hpp> #elif defined( BOOST_SP_HAS_SYNC ) -# include <boost/smart_ptr/detail/atomic_count_sync.hpp> +# include <boost/smart_ptr/detail/atomic_count_sync.hpp> -#elif defined(__GLIBCPP__) || defined(__GLIBCXX__) -# include <boost/smart_ptr/detail/atomic_count_gcc.hpp> +#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) +# include <boost/smart_ptr/detail/atomic_count_win32.hpp> -#elif defined(BOOST_HAS_PTHREADS) +#elif defined(__GLIBCPP__) || defined(__GLIBCXX__) +# include <boost/smart_ptr/detail/atomic_count_gcc.hpp> -# define BOOST_AC_USE_PTHREADS -# include <boost/smart_ptr/detail/atomic_count_pthreads.hpp> +#elif !defined( BOOST_HAS_THREADS ) +# include <boost/smart_ptr/detail/atomic_count_nt.hpp> #else - -// Use #define BOOST_DISABLE_THREADS to avoid the error -#error Unrecognized threading platform +# include <boost/smart_ptr/detail/atomic_count_spin.hpp> #endif |