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Diffstat (limited to '3rdParty/Boost/src/boost/thread/pthread/once.hpp')
| -rw-r--r-- | 3rdParty/Boost/src/boost/thread/pthread/once.hpp | 80 |
1 files changed, 55 insertions, 25 deletions
diff --git a/3rdParty/Boost/src/boost/thread/pthread/once.hpp b/3rdParty/Boost/src/boost/thread/pthread/once.hpp index 6321aa2..02c2732 100644 --- a/3rdParty/Boost/src/boost/thread/pthread/once.hpp +++ b/3rdParty/Boost/src/boost/thread/pthread/once.hpp @@ -3,53 +3,86 @@ // once.hpp // -// (C) Copyright 2007-8 Anthony Williams +// (C) Copyright 2007-8 Anthony Williams +// (C) Copyright 2011-2012 Vicente J. Botet Escriba // // 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) #include <boost/thread/detail/config.hpp> -#include <boost/config.hpp> -#include <pthread.h> -#include <boost/assert.hpp> -#include "pthread_mutex_scoped_lock.hpp" #include <boost/thread/pthread/pthread_mutex_scoped_lock.hpp> -#include <boost/cstdint.hpp> +#include <boost/thread/detail/delete.hpp> +#include <boost/detail/no_exceptions_support.hpp> +#include <boost/assert.hpp> #include <boost/config/abi_prefix.hpp> +#include <boost/cstdint.hpp> +#include <pthread.h> +#include <csignal> + namespace boost { +#define BOOST_ONCE_INITIAL_FLAG_VALUE 0 + + namespace thread_detail + { +//#ifdef SIG_ATOMIC_MAX +// typedef sig_atomic_t uintmax_atomic_t; +// #define BOOST_THREAD_DETAIL_UINTMAX_ATOMIC_MAX_C SIG_ATOMIC_MAX +//#else + typedef unsigned long uintmax_atomic_t; + #define BOOST_THREAD_DETAIL_UINTMAX_ATOMIC_C2(value) value##ul + #define BOOST_THREAD_DETAIL_UINTMAX_ATOMIC_MAX_C BOOST_THREAD_DETAIL_UINTMAX_ATOMIC_C2(~0) +//#endif + } + +#ifdef BOOST_THREAD_PROVIDES_ONCE_CXX11 + + struct once_flag + { + BOOST_THREAD_NO_COPYABLE(once_flag) + BOOST_CONSTEXPR once_flag() BOOST_NOEXCEPT + : epoch(BOOST_ONCE_INITIAL_FLAG_VALUE) + {} + private: + volatile thread_detail::uintmax_atomic_t epoch; + template<typename Function> + friend + void call_once(once_flag& flag,Function f); + }; + +#else // BOOST_THREAD_PROVIDES_ONCE_CXX11 + struct once_flag { - boost::uintmax_t epoch; + volatile thread_detail::uintmax_atomic_t epoch; }; +#define BOOST_ONCE_INIT {BOOST_ONCE_INITIAL_FLAG_VALUE} +#endif // BOOST_THREAD_PROVIDES_ONCE_CXX11 + namespace detail { - BOOST_THREAD_DECL boost::uintmax_t& get_once_per_thread_epoch(); - BOOST_THREAD_DECL extern boost::uintmax_t once_global_epoch; + BOOST_THREAD_DECL thread_detail::uintmax_atomic_t& get_once_per_thread_epoch(); + BOOST_THREAD_DECL extern thread_detail::uintmax_atomic_t once_global_epoch; BOOST_THREAD_DECL extern pthread_mutex_t once_epoch_mutex; BOOST_THREAD_DECL extern pthread_cond_t once_epoch_cv; } - -#define BOOST_ONCE_INITIAL_FLAG_VALUE 0 -#define BOOST_ONCE_INIT {BOOST_ONCE_INITIAL_FLAG_VALUE} - // Based on Mike Burrows fast_pthread_once algorithm as described in // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2444.html template<typename Function> void call_once(once_flag& flag,Function f) { - static boost::uintmax_t const uninitialized_flag=BOOST_ONCE_INITIAL_FLAG_VALUE; - static boost::uintmax_t const being_initialized=uninitialized_flag+1; - boost::uintmax_t const epoch=flag.epoch; - boost::uintmax_t& this_thread_epoch=detail::get_once_per_thread_epoch(); - + static thread_detail::uintmax_atomic_t const uninitialized_flag=BOOST_ONCE_INITIAL_FLAG_VALUE; + static thread_detail::uintmax_atomic_t const being_initialized=uninitialized_flag+1; + thread_detail::uintmax_atomic_t const epoch=flag.epoch; + thread_detail::uintmax_atomic_t& this_thread_epoch=detail::get_once_per_thread_epoch(); + if(epoch<this_thread_epoch) { pthread::pthread_mutex_scoped_lock lk(&detail::once_epoch_mutex); @@ -59,21 +92,18 @@ namespace boost if(flag.epoch==uninitialized_flag) { flag.epoch=being_initialized; -#ifndef BOOST_NO_EXCEPTIONS - try + BOOST_TRY { -#endif pthread::pthread_mutex_scoped_unlock relocker(&detail::once_epoch_mutex); f(); -#ifndef BOOST_NO_EXCEPTIONS } - catch(...) + BOOST_CATCH (...) { flag.epoch=uninitialized_flag; BOOST_VERIFY(!pthread_cond_broadcast(&detail::once_epoch_cv)); - throw; + BOOST_RETHROW } -#endif + BOOST_CATCH_END flag.epoch=--detail::once_global_epoch; BOOST_VERIFY(!pthread_cond_broadcast(&detail::once_epoch_cv)); } |