| #ifndef BOOST_THREAD_PTHREAD_ONCE_HPP |
| #define BOOST_THREAD_PTHREAD_ONCE_HPP |
| |
| // once.hpp |
| // |
| // (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/thread/detail/move.hpp> |
| #include <boost/thread/detail/invoke.hpp> |
| |
| #include <boost/thread/pthread/pthread_helpers.hpp> |
| #include <boost/thread/pthread/pthread_mutex_scoped_lock.hpp> |
| #include <boost/thread/detail/delete.hpp> |
| #include <boost/core/no_exceptions_support.hpp> |
| |
| #include <boost/bind/bind.hpp> |
| #include <boost/assert.hpp> |
| #include <boost/config/abi_prefix.hpp> |
| |
| #include <boost/cstdint.hpp> |
| #include <pthread.h> |
| #include <csignal> |
| |
| namespace boost |
| { |
| |
| struct once_flag; |
| |
| #define BOOST_ONCE_INITIAL_FLAG_VALUE 0 |
| |
| namespace thread_detail |
| { |
| typedef boost::uint32_t uintmax_atomic_t; |
| #define BOOST_THREAD_DETAIL_UINTMAX_ATOMIC_C2(value) value##u |
| #define BOOST_THREAD_DETAIL_UINTMAX_ATOMIC_MAX_C BOOST_THREAD_DETAIL_UINTMAX_ATOMIC_C2(~0) |
| |
| } |
| |
| #ifdef BOOST_THREAD_PROVIDES_ONCE_CXX11 |
| #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) |
| template<typename Function, class ...ArgTypes> |
| inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(ArgTypes)... args); |
| #else |
| template<typename Function> |
| inline void call_once(once_flag& flag, Function f); |
| template<typename Function, typename T1> |
| inline void call_once(once_flag& flag, Function f, T1 p1); |
| template<typename Function, typename T1, typename T2> |
| inline void call_once(once_flag& flag, Function f, T1 p1, T2 p2); |
| template<typename Function, typename T1, typename T2, typename T3> |
| inline void call_once(once_flag& flag, Function f, T1 p1, T2 p2, T3 p3); |
| #endif |
| |
| 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; |
| |
| #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) |
| template<typename Function, class ...ArgTypes> |
| friend void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(ArgTypes)... args); |
| #else |
| template<typename Function> |
| friend void call_once(once_flag& flag, Function f); |
| template<typename Function, typename T1> |
| friend void call_once(once_flag& flag, Function f, T1 p1); |
| template<typename Function, typename T1, typename T2> |
| friend void call_once(once_flag& flag, Function f, T1 p1, T2 p2); |
| template<typename Function, typename T1, typename T2, typename T3> |
| friend void call_once(once_flag& flag, Function f, T1 p1, T2 p2, T3 p3); |
| |
| #endif |
| |
| }; |
| |
| #define BOOST_ONCE_INIT once_flag() |
| |
| #else // BOOST_THREAD_PROVIDES_ONCE_CXX11 |
| |
| struct once_flag |
| { |
| volatile thread_detail::uintmax_atomic_t epoch; |
| }; |
| |
| #define BOOST_ONCE_INIT {BOOST_ONCE_INITIAL_FLAG_VALUE} |
| #endif // BOOST_THREAD_PROVIDES_ONCE_CXX11 |
| |
| |
| #if defined BOOST_THREAD_PROVIDES_INVOKE |
| #define BOOST_THREAD_INVOKE_RET_VOID detail::invoke |
| #define BOOST_THREAD_INVOKE_RET_VOID_CALL |
| #elif defined BOOST_THREAD_PROVIDES_INVOKE_RET |
| #define BOOST_THREAD_INVOKE_RET_VOID detail::invoke<void> |
| #define BOOST_THREAD_INVOKE_RET_VOID_CALL |
| #else |
| #define BOOST_THREAD_INVOKE_RET_VOID boost::bind |
| #define BOOST_THREAD_INVOKE_RET_VOID_CALL () |
| #endif |
| |
| namespace thread_detail |
| { |
| BOOST_THREAD_DECL uintmax_atomic_t& get_once_per_thread_epoch(); |
| BOOST_THREAD_DECL extern 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; |
| } |
| |
| // Based on Mike Burrows fast_pthread_once algorithm as described in |
| // http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2444.html |
| |
| |
| #if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) |
| |
| |
| template<typename Function, class ...ArgTypes> |
| inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(ArgTypes)... args) |
| { |
| 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=thread_detail::get_once_per_thread_epoch(); |
| |
| if(epoch<this_thread_epoch) |
| { |
| pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex); |
| |
| while(flag.epoch<=being_initialized) |
| { |
| if(flag.epoch==uninitialized_flag) |
| { |
| flag.epoch=being_initialized; |
| BOOST_TRY |
| { |
| pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex); |
| BOOST_THREAD_INVOKE_RET_VOID( |
| thread_detail::decay_copy(boost::forward<Function>(f)), |
| thread_detail::decay_copy(boost::forward<ArgTypes>(args))... |
| ) BOOST_THREAD_INVOKE_RET_VOID_CALL; |
| } |
| BOOST_CATCH (...) |
| { |
| flag.epoch=uninitialized_flag; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| BOOST_RETHROW |
| } |
| BOOST_CATCH_END |
| flag.epoch=--thread_detail::once_global_epoch; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| } |
| else |
| { |
| while(flag.epoch==being_initialized) |
| { |
| BOOST_VERIFY(!posix::pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex)); |
| } |
| } |
| } |
| this_thread_epoch=thread_detail::once_global_epoch; |
| |
| } |
| } |
| #else |
| template<typename Function> |
| inline void call_once(once_flag& flag, Function f) |
| { |
| 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=thread_detail::get_once_per_thread_epoch(); |
| |
| if(epoch<this_thread_epoch) |
| { |
| pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex); |
| |
| while(flag.epoch<=being_initialized) |
| { |
| if(flag.epoch==uninitialized_flag) |
| { |
| flag.epoch=being_initialized; |
| BOOST_TRY |
| { |
| pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex); |
| f(); |
| } |
| BOOST_CATCH (...) |
| { |
| flag.epoch=uninitialized_flag; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| BOOST_RETHROW |
| } |
| BOOST_CATCH_END |
| flag.epoch=--thread_detail::once_global_epoch; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| } |
| else |
| { |
| while(flag.epoch==being_initialized) |
| { |
| BOOST_VERIFY(!posix::pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex)); |
| } |
| } |
| } |
| this_thread_epoch=thread_detail::once_global_epoch; |
| } |
| } |
| |
| template<typename Function, typename T1> |
| inline void call_once(once_flag& flag, Function f, T1 p1) |
| { |
| 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=thread_detail::get_once_per_thread_epoch(); |
| |
| if(epoch<this_thread_epoch) |
| { |
| pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex); |
| |
| while(flag.epoch<=being_initialized) |
| { |
| if(flag.epoch==uninitialized_flag) |
| { |
| flag.epoch=being_initialized; |
| BOOST_TRY |
| { |
| pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex); |
| BOOST_THREAD_INVOKE_RET_VOID(f,p1) BOOST_THREAD_INVOKE_RET_VOID_CALL; |
| } |
| BOOST_CATCH (...) |
| { |
| flag.epoch=uninitialized_flag; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| BOOST_RETHROW |
| } |
| BOOST_CATCH_END |
| flag.epoch=--thread_detail::once_global_epoch; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| } |
| else |
| { |
| while(flag.epoch==being_initialized) |
| { |
| BOOST_VERIFY(!posix::pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex)); |
| } |
| } |
| } |
| this_thread_epoch=thread_detail::once_global_epoch; |
| } |
| } |
| template<typename Function, typename T1, typename T2> |
| inline void call_once(once_flag& flag, Function f, T1 p1, T2 p2) |
| { |
| 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=thread_detail::get_once_per_thread_epoch(); |
| |
| if(epoch<this_thread_epoch) |
| { |
| pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex); |
| |
| while(flag.epoch<=being_initialized) |
| { |
| if(flag.epoch==uninitialized_flag) |
| { |
| flag.epoch=being_initialized; |
| BOOST_TRY |
| { |
| pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex); |
| BOOST_THREAD_INVOKE_RET_VOID(f,p1, p2) BOOST_THREAD_INVOKE_RET_VOID_CALL; |
| } |
| BOOST_CATCH (...) |
| { |
| flag.epoch=uninitialized_flag; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| BOOST_RETHROW |
| } |
| BOOST_CATCH_END |
| flag.epoch=--thread_detail::once_global_epoch; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| } |
| else |
| { |
| while(flag.epoch==being_initialized) |
| { |
| BOOST_VERIFY(!posix::pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex)); |
| } |
| } |
| } |
| this_thread_epoch=thread_detail::once_global_epoch; |
| } |
| } |
| |
| template<typename Function, typename T1, typename T2, typename T3> |
| inline void call_once(once_flag& flag, Function f, T1 p1, T2 p2, T3 p3) |
| { |
| 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=thread_detail::get_once_per_thread_epoch(); |
| |
| if(epoch<this_thread_epoch) |
| { |
| pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex); |
| |
| while(flag.epoch<=being_initialized) |
| { |
| if(flag.epoch==uninitialized_flag) |
| { |
| flag.epoch=being_initialized; |
| BOOST_TRY |
| { |
| pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex); |
| BOOST_THREAD_INVOKE_RET_VOID(f,p1, p2, p3) BOOST_THREAD_INVOKE_RET_VOID_CALL; |
| } |
| BOOST_CATCH (...) |
| { |
| flag.epoch=uninitialized_flag; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| BOOST_RETHROW |
| } |
| BOOST_CATCH_END |
| flag.epoch=--thread_detail::once_global_epoch; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| } |
| else |
| { |
| while(flag.epoch==being_initialized) |
| { |
| BOOST_VERIFY(!posix::pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex)); |
| } |
| } |
| } |
| this_thread_epoch=thread_detail::once_global_epoch; |
| } |
| } |
| |
| template<typename Function> |
| inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f) |
| { |
| 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=thread_detail::get_once_per_thread_epoch(); |
| |
| if(epoch<this_thread_epoch) |
| { |
| pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex); |
| |
| while(flag.epoch<=being_initialized) |
| { |
| if(flag.epoch==uninitialized_flag) |
| { |
| flag.epoch=being_initialized; |
| BOOST_TRY |
| { |
| pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex); |
| f(); |
| } |
| BOOST_CATCH (...) |
| { |
| flag.epoch=uninitialized_flag; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| BOOST_RETHROW |
| } |
| BOOST_CATCH_END |
| flag.epoch=--thread_detail::once_global_epoch; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| } |
| else |
| { |
| while(flag.epoch==being_initialized) |
| { |
| BOOST_VERIFY(!posix::pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex)); |
| } |
| } |
| } |
| this_thread_epoch=thread_detail::once_global_epoch; |
| } |
| } |
| |
| template<typename Function, typename T1> |
| inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(T1) p1) |
| { |
| 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=thread_detail::get_once_per_thread_epoch(); |
| |
| if(epoch<this_thread_epoch) |
| { |
| pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex); |
| |
| while(flag.epoch<=being_initialized) |
| { |
| if(flag.epoch==uninitialized_flag) |
| { |
| flag.epoch=being_initialized; |
| BOOST_TRY |
| { |
| pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex); |
| BOOST_THREAD_INVOKE_RET_VOID( |
| thread_detail::decay_copy(boost::forward<Function>(f)), |
| thread_detail::decay_copy(boost::forward<T1>(p1)) |
| ) BOOST_THREAD_INVOKE_RET_VOID_CALL; |
| } |
| BOOST_CATCH (...) |
| { |
| flag.epoch=uninitialized_flag; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| BOOST_RETHROW |
| } |
| BOOST_CATCH_END |
| flag.epoch=--thread_detail::once_global_epoch; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| } |
| else |
| { |
| while(flag.epoch==being_initialized) |
| { |
| BOOST_VERIFY(!posix::pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex)); |
| } |
| } |
| } |
| this_thread_epoch=thread_detail::once_global_epoch; |
| } |
| } |
| template<typename Function, typename T1, typename T2> |
| inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(T1) p1, BOOST_THREAD_RV_REF(T2) p2) |
| { |
| 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=thread_detail::get_once_per_thread_epoch(); |
| |
| if(epoch<this_thread_epoch) |
| { |
| pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex); |
| |
| while(flag.epoch<=being_initialized) |
| { |
| if(flag.epoch==uninitialized_flag) |
| { |
| flag.epoch=being_initialized; |
| BOOST_TRY |
| { |
| pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex); |
| BOOST_THREAD_INVOKE_RET_VOID( |
| thread_detail::decay_copy(boost::forward<Function>(f)), |
| thread_detail::decay_copy(boost::forward<T1>(p1)), |
| thread_detail::decay_copy(boost::forward<T1>(p2)) |
| ) BOOST_THREAD_INVOKE_RET_VOID_CALL; |
| } |
| BOOST_CATCH (...) |
| { |
| flag.epoch=uninitialized_flag; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| BOOST_RETHROW |
| } |
| BOOST_CATCH_END |
| flag.epoch=--thread_detail::once_global_epoch; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| } |
| else |
| { |
| while(flag.epoch==being_initialized) |
| { |
| BOOST_VERIFY(!posix::pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex)); |
| } |
| } |
| } |
| this_thread_epoch=thread_detail::once_global_epoch; |
| } |
| } |
| |
| template<typename Function, typename T1, typename T2, typename T3> |
| inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(T1) p1, BOOST_THREAD_RV_REF(T2) p2, BOOST_THREAD_RV_REF(T3) p3) |
| { |
| 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=thread_detail::get_once_per_thread_epoch(); |
| |
| if(epoch<this_thread_epoch) |
| { |
| pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex); |
| |
| while(flag.epoch<=being_initialized) |
| { |
| if(flag.epoch==uninitialized_flag) |
| { |
| flag.epoch=being_initialized; |
| BOOST_TRY |
| { |
| pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex); |
| BOOST_THREAD_INVOKE_RET_VOID( |
| thread_detail::decay_copy(boost::forward<Function>(f)), |
| thread_detail::decay_copy(boost::forward<T1>(p1)), |
| thread_detail::decay_copy(boost::forward<T1>(p2)), |
| thread_detail::decay_copy(boost::forward<T1>(p3)) |
| ) BOOST_THREAD_INVOKE_RET_VOID_CALL; |
| } |
| BOOST_CATCH (...) |
| { |
| flag.epoch=uninitialized_flag; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| BOOST_RETHROW |
| } |
| BOOST_CATCH_END |
| flag.epoch=--thread_detail::once_global_epoch; |
| BOOST_VERIFY(!posix::pthread_cond_broadcast(&thread_detail::once_epoch_cv)); |
| } |
| else |
| { |
| while(flag.epoch==being_initialized) |
| { |
| BOOST_VERIFY(!posix::pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex)); |
| } |
| } |
| } |
| this_thread_epoch=thread_detail::once_global_epoch; |
| } |
| } |
| |
| #endif |
| |
| } |
| |
| #include <boost/config/abi_suffix.hpp> |
| |
| #endif |
