diff -r 666f914201fb -r 2fe1408b6811 epoc32/include/stdapis/boost/detail/atomic_count.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/epoc32/include/stdapis/boost/detail/atomic_count.hpp Tue Mar 16 16:12:26 2010 +0000 @@ -0,0 +1,108 @@ +#ifndef BOOST_DETAIL_ATOMIC_COUNT_HPP_INCLUDED +#define BOOST_DETAIL_ATOMIC_COUNT_HPP_INCLUDED + +// MS compatible compilers support #pragma once + +#if defined(_MSC_VER) && (_MSC_VER >= 1020) +# pragma once +#endif + +// +// boost/detail/atomic_count.hpp - thread/SMP safe reference counter +// +// Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd. +// +// 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 boost::detail::atomic_count; +// +// atomic_count a(n); +// +// (n is convertible to long) +// +// Effects: Constructs an atomic_count with an initial value of n +// +// a; +// +// Returns: (long) the current value of a +// +// ++a; +// +// Effects: Atomically increments the value of a +// Returns: nothing +// +// --a; +// +// Effects: Atomically decrements the value of a +// Returns: (long) zero if the new value of a is zero, +// unspecified non-zero value otherwise (usually the new value) +// +// 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... +// + +#include + +#ifndef BOOST_HAS_THREADS + +namespace boost +{ + +namespace detail +{ + +typedef long atomic_count; + +} + +} + +#elif defined(BOOST_AC_USE_PTHREADS) +# include +#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__) +# include +#elif defined(__GLIBCPP__) || defined(__GLIBCXX__) +# include +#elif defined(BOOST_HAS_PTHREADS) +# define BOOST_AC_USE_PTHREADS +# include +#else + +// Use #define BOOST_DISABLE_THREADS to avoid the error +#error Unrecognized threading platform + +#endif + +#endif // #ifndef BOOST_DETAIL_ATOMIC_COUNT_HPP_INCLUDED