541 lines
21 KiB
C++
541 lines
21 KiB
C++
#ifndef BOOST_THREAD_PTHREAD_ONCE_HPP
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#define BOOST_THREAD_PTHREAD_ONCE_HPP
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// once.hpp
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//
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// (C) Copyright 2007-8 Anthony Williams
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// (C) Copyright 2011-2012 Vicente J. Botet Escriba
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#include <boost/thread/detail/config.hpp>
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#include <boost/thread/detail/move.hpp>
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#include <boost/thread/detail/invoke.hpp>
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#include <boost/thread/pthread/pthread_mutex_scoped_lock.hpp>
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#include <boost/thread/detail/delete.hpp>
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#include <boost/detail/no_exceptions_support.hpp>
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#include <boost/bind.hpp>
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#include <boost/assert.hpp>
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#include <boost/config/abi_prefix.hpp>
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#include <boost/cstdint.hpp>
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#include <pthread.h>
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#include <csignal>
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namespace boost
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{
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struct once_flag;
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#define BOOST_ONCE_INITIAL_FLAG_VALUE 0
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namespace thread_detail
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{
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typedef boost::uint32_t uintmax_atomic_t;
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#define BOOST_THREAD_DETAIL_UINTMAX_ATOMIC_C2(value) value##u
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#define BOOST_THREAD_DETAIL_UINTMAX_ATOMIC_MAX_C BOOST_THREAD_DETAIL_UINTMAX_ATOMIC_C2(~0)
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}
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#ifdef BOOST_THREAD_PROVIDES_ONCE_CXX11
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#ifndef BOOST_NO_CXX11_VARIADIC_TEMPLATES
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template<typename Function, class ...ArgTypes>
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inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(ArgTypes)... args);
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#else
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template<typename Function>
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inline void call_once(once_flag& flag, Function f);
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template<typename Function, typename T1>
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inline void call_once(once_flag& flag, Function f, T1 p1);
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template<typename Function, typename T1, typename T2>
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inline void call_once(once_flag& flag, Function f, T1 p1, T2 p2);
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template<typename Function, typename T1, typename T2, typename T3>
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inline void call_once(once_flag& flag, Function f, T1 p1, T2 p2, T3 p3);
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#endif
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struct once_flag
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{
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BOOST_THREAD_NO_COPYABLE(once_flag)
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BOOST_CONSTEXPR once_flag() BOOST_NOEXCEPT
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: epoch(BOOST_ONCE_INITIAL_FLAG_VALUE)
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{}
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private:
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volatile thread_detail::uintmax_atomic_t epoch;
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#ifndef BOOST_NO_CXX11_VARIADIC_TEMPLATES
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template<typename Function, class ...ArgTypes>
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friend void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(ArgTypes)... args);
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#else
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template<typename Function>
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friend void call_once(once_flag& flag, Function f);
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template<typename Function, typename T1>
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friend void call_once(once_flag& flag, Function f, T1 p1);
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template<typename Function, typename T1, typename T2>
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friend void call_once(once_flag& flag, Function f, T1 p1, T2 p2);
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template<typename Function, typename T1, typename T2, typename T3>
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friend void call_once(once_flag& flag, Function f, T1 p1, T2 p2, T3 p3);
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#endif
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};
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#define BOOST_ONCE_INIT once_flag()
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#else // BOOST_THREAD_PROVIDES_ONCE_CXX11
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struct once_flag
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{
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volatile thread_detail::uintmax_atomic_t epoch;
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};
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#define BOOST_ONCE_INIT {BOOST_ONCE_INITIAL_FLAG_VALUE}
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#endif // BOOST_THREAD_PROVIDES_ONCE_CXX11
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#if defined BOOST_THREAD_PROVIDES_INVOKE
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#define BOOST_THREAD_INVOKE_RET_VOID detail::invoke
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#define BOOST_THREAD_INVOKE_RET_VOID_CALL
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#elif defined BOOST_THREAD_PROVIDES_INVOKE_RET
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#define BOOST_THREAD_INVOKE_RET_VOID detail::invoke<void>
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#define BOOST_THREAD_INVOKE_RET_VOID_CALL
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#else
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#define BOOST_THREAD_INVOKE_RET_VOID boost::bind
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#define BOOST_THREAD_INVOKE_RET_VOID_CALL ()
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#endif
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namespace thread_detail
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{
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BOOST_THREAD_DECL uintmax_atomic_t& get_once_per_thread_epoch();
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BOOST_THREAD_DECL extern uintmax_atomic_t once_global_epoch;
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BOOST_THREAD_DECL extern pthread_mutex_t once_epoch_mutex;
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BOOST_THREAD_DECL extern pthread_cond_t once_epoch_cv;
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}
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// Based on Mike Burrows fast_pthread_once algorithm as described in
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// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2444.html
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#ifndef BOOST_NO_CXX11_VARIADIC_TEMPLATES
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template<typename Function, class ...ArgTypes>
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inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(ArgTypes)... args)
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{
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static thread_detail::uintmax_atomic_t const uninitialized_flag=BOOST_ONCE_INITIAL_FLAG_VALUE;
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static thread_detail::uintmax_atomic_t const being_initialized=uninitialized_flag+1;
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thread_detail::uintmax_atomic_t const epoch=flag.epoch;
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thread_detail::uintmax_atomic_t& this_thread_epoch=thread_detail::get_once_per_thread_epoch();
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if(epoch<this_thread_epoch)
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{
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pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex);
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while(flag.epoch<=being_initialized)
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{
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if(flag.epoch==uninitialized_flag)
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{
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flag.epoch=being_initialized;
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BOOST_TRY
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{
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pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex);
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BOOST_THREAD_INVOKE_RET_VOID(
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thread_detail::decay_copy(boost::forward<Function>(f)),
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thread_detail::decay_copy(boost::forward<ArgTypes>(args))...
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) BOOST_THREAD_INVOKE_RET_VOID_CALL;
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}
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BOOST_CATCH (...)
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{
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flag.epoch=uninitialized_flag;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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BOOST_RETHROW
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}
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BOOST_CATCH_END
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flag.epoch=--thread_detail::once_global_epoch;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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}
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else
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{
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while(flag.epoch==being_initialized)
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{
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BOOST_VERIFY(!pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex));
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}
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}
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}
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this_thread_epoch=thread_detail::once_global_epoch;
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}
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}
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#else
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template<typename Function>
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inline void call_once(once_flag& flag, Function f)
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{
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static thread_detail::uintmax_atomic_t const uninitialized_flag=BOOST_ONCE_INITIAL_FLAG_VALUE;
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static thread_detail::uintmax_atomic_t const being_initialized=uninitialized_flag+1;
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thread_detail::uintmax_atomic_t const epoch=flag.epoch;
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thread_detail::uintmax_atomic_t& this_thread_epoch=thread_detail::get_once_per_thread_epoch();
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if(epoch<this_thread_epoch)
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{
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pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex);
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while(flag.epoch<=being_initialized)
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{
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if(flag.epoch==uninitialized_flag)
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{
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flag.epoch=being_initialized;
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BOOST_TRY
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{
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pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex);
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f();
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}
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BOOST_CATCH (...)
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{
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flag.epoch=uninitialized_flag;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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BOOST_RETHROW
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}
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BOOST_CATCH_END
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flag.epoch=--thread_detail::once_global_epoch;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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}
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else
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{
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while(flag.epoch==being_initialized)
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{
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BOOST_VERIFY(!pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex));
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}
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}
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}
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this_thread_epoch=thread_detail::once_global_epoch;
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}
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}
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template<typename Function, typename T1>
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inline void call_once(once_flag& flag, Function f, T1 p1)
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{
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static thread_detail::uintmax_atomic_t const uninitialized_flag=BOOST_ONCE_INITIAL_FLAG_VALUE;
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static thread_detail::uintmax_atomic_t const being_initialized=uninitialized_flag+1;
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thread_detail::uintmax_atomic_t const epoch=flag.epoch;
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thread_detail::uintmax_atomic_t& this_thread_epoch=thread_detail::get_once_per_thread_epoch();
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if(epoch<this_thread_epoch)
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{
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pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex);
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while(flag.epoch<=being_initialized)
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{
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if(flag.epoch==uninitialized_flag)
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{
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flag.epoch=being_initialized;
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BOOST_TRY
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{
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pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex);
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BOOST_THREAD_INVOKE_RET_VOID(f,p1) BOOST_THREAD_INVOKE_RET_VOID_CALL;
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}
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BOOST_CATCH (...)
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{
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flag.epoch=uninitialized_flag;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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BOOST_RETHROW
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}
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BOOST_CATCH_END
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flag.epoch=--thread_detail::once_global_epoch;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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}
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else
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{
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while(flag.epoch==being_initialized)
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{
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BOOST_VERIFY(!pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex));
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}
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}
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}
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this_thread_epoch=thread_detail::once_global_epoch;
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}
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}
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template<typename Function, typename T1, typename T2>
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inline void call_once(once_flag& flag, Function f, T1 p1, T2 p2)
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{
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static thread_detail::uintmax_atomic_t const uninitialized_flag=BOOST_ONCE_INITIAL_FLAG_VALUE;
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static thread_detail::uintmax_atomic_t const being_initialized=uninitialized_flag+1;
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thread_detail::uintmax_atomic_t const epoch=flag.epoch;
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thread_detail::uintmax_atomic_t& this_thread_epoch=thread_detail::get_once_per_thread_epoch();
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if(epoch<this_thread_epoch)
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{
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pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex);
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while(flag.epoch<=being_initialized)
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{
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if(flag.epoch==uninitialized_flag)
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{
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flag.epoch=being_initialized;
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BOOST_TRY
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{
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pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex);
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BOOST_THREAD_INVOKE_RET_VOID(f,p1, p2) BOOST_THREAD_INVOKE_RET_VOID_CALL;
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}
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BOOST_CATCH (...)
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{
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flag.epoch=uninitialized_flag;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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BOOST_RETHROW
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}
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BOOST_CATCH_END
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flag.epoch=--thread_detail::once_global_epoch;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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}
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else
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{
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while(flag.epoch==being_initialized)
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{
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BOOST_VERIFY(!pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex));
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}
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}
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}
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this_thread_epoch=thread_detail::once_global_epoch;
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}
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}
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template<typename Function, typename T1, typename T2, typename T3>
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inline void call_once(once_flag& flag, Function f, T1 p1, T2 p2, T3 p3)
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{
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static thread_detail::uintmax_atomic_t const uninitialized_flag=BOOST_ONCE_INITIAL_FLAG_VALUE;
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static thread_detail::uintmax_atomic_t const being_initialized=uninitialized_flag+1;
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thread_detail::uintmax_atomic_t const epoch=flag.epoch;
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thread_detail::uintmax_atomic_t& this_thread_epoch=thread_detail::get_once_per_thread_epoch();
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if(epoch<this_thread_epoch)
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{
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pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex);
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while(flag.epoch<=being_initialized)
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{
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if(flag.epoch==uninitialized_flag)
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{
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flag.epoch=being_initialized;
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BOOST_TRY
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{
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pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex);
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BOOST_THREAD_INVOKE_RET_VOID(f,p1, p2, p3) BOOST_THREAD_INVOKE_RET_VOID_CALL;
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}
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BOOST_CATCH (...)
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{
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flag.epoch=uninitialized_flag;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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BOOST_RETHROW
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}
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BOOST_CATCH_END
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flag.epoch=--thread_detail::once_global_epoch;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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}
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else
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{
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while(flag.epoch==being_initialized)
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{
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BOOST_VERIFY(!pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex));
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}
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}
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}
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this_thread_epoch=thread_detail::once_global_epoch;
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}
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}
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template<typename Function>
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inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f)
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{
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static thread_detail::uintmax_atomic_t const uninitialized_flag=BOOST_ONCE_INITIAL_FLAG_VALUE;
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static thread_detail::uintmax_atomic_t const being_initialized=uninitialized_flag+1;
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thread_detail::uintmax_atomic_t const epoch=flag.epoch;
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thread_detail::uintmax_atomic_t& this_thread_epoch=thread_detail::get_once_per_thread_epoch();
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if(epoch<this_thread_epoch)
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{
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pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex);
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while(flag.epoch<=being_initialized)
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{
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if(flag.epoch==uninitialized_flag)
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{
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flag.epoch=being_initialized;
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BOOST_TRY
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{
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pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex);
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f();
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}
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BOOST_CATCH (...)
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{
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flag.epoch=uninitialized_flag;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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BOOST_RETHROW
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}
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BOOST_CATCH_END
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flag.epoch=--thread_detail::once_global_epoch;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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}
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else
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{
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while(flag.epoch==being_initialized)
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{
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BOOST_VERIFY(!pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex));
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}
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}
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}
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this_thread_epoch=thread_detail::once_global_epoch;
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}
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}
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template<typename Function, typename T1>
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inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(T1) p1)
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{
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static thread_detail::uintmax_atomic_t const uninitialized_flag=BOOST_ONCE_INITIAL_FLAG_VALUE;
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static thread_detail::uintmax_atomic_t const being_initialized=uninitialized_flag+1;
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thread_detail::uintmax_atomic_t const epoch=flag.epoch;
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thread_detail::uintmax_atomic_t& this_thread_epoch=thread_detail::get_once_per_thread_epoch();
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if(epoch<this_thread_epoch)
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{
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pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex);
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while(flag.epoch<=being_initialized)
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{
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if(flag.epoch==uninitialized_flag)
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{
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flag.epoch=being_initialized;
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BOOST_TRY
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{
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pthread::pthread_mutex_scoped_unlock relocker(&thread_detail::once_epoch_mutex);
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BOOST_THREAD_INVOKE_RET_VOID(
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thread_detail::decay_copy(boost::forward<Function>(f)),
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thread_detail::decay_copy(boost::forward<T1>(p1))
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) BOOST_THREAD_INVOKE_RET_VOID_CALL;
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}
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BOOST_CATCH (...)
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{
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flag.epoch=uninitialized_flag;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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BOOST_RETHROW
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}
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BOOST_CATCH_END
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flag.epoch=--thread_detail::once_global_epoch;
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BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
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}
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else
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{
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while(flag.epoch==being_initialized)
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{
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BOOST_VERIFY(!pthread_cond_wait(&thread_detail::once_epoch_cv,&thread_detail::once_epoch_mutex));
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}
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}
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}
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this_thread_epoch=thread_detail::once_global_epoch;
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}
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}
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template<typename Function, typename T1, typename T2>
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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)
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{
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static thread_detail::uintmax_atomic_t const uninitialized_flag=BOOST_ONCE_INITIAL_FLAG_VALUE;
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static thread_detail::uintmax_atomic_t const being_initialized=uninitialized_flag+1;
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thread_detail::uintmax_atomic_t const epoch=flag.epoch;
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thread_detail::uintmax_atomic_t& this_thread_epoch=thread_detail::get_once_per_thread_epoch();
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if(epoch<this_thread_epoch)
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{
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pthread::pthread_mutex_scoped_lock lk(&thread_detail::once_epoch_mutex);
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while(flag.epoch<=being_initialized)
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{
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if(flag.epoch==uninitialized_flag)
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{
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flag.epoch=being_initialized;
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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(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
|
|
BOOST_RETHROW
|
|
}
|
|
BOOST_CATCH_END
|
|
flag.epoch=--thread_detail::once_global_epoch;
|
|
BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
|
|
}
|
|
else
|
|
{
|
|
while(flag.epoch==being_initialized)
|
|
{
|
|
BOOST_VERIFY(!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(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
|
|
BOOST_RETHROW
|
|
}
|
|
BOOST_CATCH_END
|
|
flag.epoch=--thread_detail::once_global_epoch;
|
|
BOOST_VERIFY(!pthread_cond_broadcast(&thread_detail::once_epoch_cv));
|
|
}
|
|
else
|
|
{
|
|
while(flag.epoch==being_initialized)
|
|
{
|
|
BOOST_VERIFY(!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
|