diff options
Diffstat (limited to 'gcc-4.8.1/libstdc++-v3/include/std/future')
-rw-r--r-- | gcc-4.8.1/libstdc++-v3/include/std/future | 1553 |
1 files changed, 0 insertions, 1553 deletions
diff --git a/gcc-4.8.1/libstdc++-v3/include/std/future b/gcc-4.8.1/libstdc++-v3/include/std/future deleted file mode 100644 index 30100fe05..000000000 --- a/gcc-4.8.1/libstdc++-v3/include/std/future +++ /dev/null @@ -1,1553 +0,0 @@ -// <future> -*- C++ -*- - -// Copyright (C) 2009-2013 Free Software Foundation, Inc. -// -// This file is part of the GNU ISO C++ Library. This library is free -// software; you can redistribute it and/or modify it under the -// terms of the GNU General Public License as published by the -// Free Software Foundation; either version 3, or (at your option) -// any later version. - -// This library is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -// GNU General Public License for more details. - -// Under Section 7 of GPL version 3, you are granted additional -// permissions described in the GCC Runtime Library Exception, version -// 3.1, as published by the Free Software Foundation. - -// You should have received a copy of the GNU General Public License and -// a copy of the GCC Runtime Library Exception along with this program; -// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -// <http://www.gnu.org/licenses/>. - -/** @file include/future - * This is a Standard C++ Library header. - */ - -#ifndef _GLIBCXX_FUTURE -#define _GLIBCXX_FUTURE 1 - -#pragma GCC system_header - -#if __cplusplus < 201103L -# include <bits/c++0x_warning.h> -#else - -#include <functional> -#include <mutex> -#include <thread> -#include <condition_variable> -#include <system_error> -#include <atomic> -#include <bits/functexcept.h> -#include <bits/unique_ptr.h> -#include <bits/shared_ptr.h> -#include <bits/uses_allocator.h> -#include <bits/alloc_traits.h> - -namespace std _GLIBCXX_VISIBILITY(default) -{ -_GLIBCXX_BEGIN_NAMESPACE_VERSION - - /** - * @defgroup futures Futures - * @ingroup concurrency - * - * Classes for futures support. - * @{ - */ - - /// Error code for futures - enum class future_errc - { - future_already_retrieved = 1, - promise_already_satisfied, - no_state, - broken_promise - }; - - /// Specialization. - template<> - struct is_error_code_enum<future_errc> : public true_type { }; - - /// Points to a statically-allocated object derived from error_category. - const error_category& - future_category() noexcept; - - /// Overload for make_error_code. - inline error_code - make_error_code(future_errc __errc) noexcept - { return error_code(static_cast<int>(__errc), future_category()); } - - /// Overload for make_error_condition. - inline error_condition - make_error_condition(future_errc __errc) noexcept - { return error_condition(static_cast<int>(__errc), future_category()); } - - /** - * @brief Exception type thrown by futures. - * @ingroup exceptions - */ - class future_error : public logic_error - { - error_code _M_code; - - public: - explicit future_error(error_code __ec) - : logic_error("std::future_error"), _M_code(__ec) - { } - - virtual ~future_error() noexcept; - - virtual const char* - what() const noexcept; - - const error_code& - code() const noexcept { return _M_code; } - }; - - // Forward declarations. - template<typename _Res> - class future; - - template<typename _Res> - class shared_future; - - template<typename _Signature> - class packaged_task; - - template<typename _Res> - class promise; - - /// Launch code for futures - enum class launch - { - async = 1, - deferred = 2 - }; - - constexpr launch operator&(launch __x, launch __y) - { - return static_cast<launch>( - static_cast<int>(__x) & static_cast<int>(__y)); - } - - constexpr launch operator|(launch __x, launch __y) - { - return static_cast<launch>( - static_cast<int>(__x) | static_cast<int>(__y)); - } - - constexpr launch operator^(launch __x, launch __y) - { - return static_cast<launch>( - static_cast<int>(__x) ^ static_cast<int>(__y)); - } - - constexpr launch operator~(launch __x) - { return static_cast<launch>(~static_cast<int>(__x)); } - - inline launch& operator&=(launch& __x, launch __y) - { return __x = __x & __y; } - - inline launch& operator|=(launch& __x, launch __y) - { return __x = __x | __y; } - - inline launch& operator^=(launch& __x, launch __y) - { return __x = __x ^ __y; } - - /// Status code for futures - enum class future_status - { - ready, - timeout, - deferred - }; - - template<typename _Fn, typename... _Args> - future<typename result_of<_Fn(_Args...)>::type> - async(launch __policy, _Fn&& __fn, _Args&&... __args); - - template<typename _Fn, typename... _Args> - future<typename result_of<_Fn(_Args...)>::type> - async(_Fn&& __fn, _Args&&... __args); - -#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) \ - && (ATOMIC_INT_LOCK_FREE > 1) - - /// Base class and enclosing scope. - struct __future_base - { - /// Base class for results. - struct _Result_base - { - exception_ptr _M_error; - - _Result_base(const _Result_base&) = delete; - _Result_base& operator=(const _Result_base&) = delete; - - // _M_destroy() allows derived classes to control deallocation - virtual void _M_destroy() = 0; - - struct _Deleter - { - void operator()(_Result_base* __fr) const { __fr->_M_destroy(); } - }; - - protected: - _Result_base(); - virtual ~_Result_base(); - }; - - /// Result. - template<typename _Res> - struct _Result : _Result_base - { - private: - typedef alignment_of<_Res> __a_of; - typedef aligned_storage<sizeof(_Res), __a_of::value> __align_storage; - typedef typename __align_storage::type __align_type; - - __align_type _M_storage; - bool _M_initialized; - - public: - typedef _Res result_type; - - _Result() noexcept : _M_initialized() { } - - ~_Result() - { - if (_M_initialized) - _M_value().~_Res(); - } - - // Return lvalue, future will add const or rvalue-reference - _Res& - _M_value() noexcept { return *static_cast<_Res*>(_M_addr()); } - - void - _M_set(const _Res& __res) - { - ::new (_M_addr()) _Res(__res); - _M_initialized = true; - } - - void - _M_set(_Res&& __res) - { - ::new (_M_addr()) _Res(std::move(__res)); - _M_initialized = true; - } - - private: - void _M_destroy() { delete this; } - - void* _M_addr() noexcept { return static_cast<void*>(&_M_storage); } - }; - - /// A unique_ptr based on the instantiating type. - template<typename _Res> - using _Ptr = unique_ptr<_Res, _Result_base::_Deleter>; - - /// Result_alloc. - template<typename _Res, typename _Alloc> - struct _Result_alloc final : _Result<_Res>, _Alloc - { - typedef typename allocator_traits<_Alloc>::template - rebind_alloc<_Result_alloc> __allocator_type; - - explicit - _Result_alloc(const _Alloc& __a) : _Result<_Res>(), _Alloc(__a) - { } - - private: - void _M_destroy() - { - typedef allocator_traits<__allocator_type> __traits; - __allocator_type __a(*this); - __traits::destroy(__a, this); - __traits::deallocate(__a, this, 1); - } - }; - - template<typename _Res, typename _Allocator> - static _Ptr<_Result_alloc<_Res, _Allocator>> - _S_allocate_result(const _Allocator& __a) - { - typedef _Result_alloc<_Res, _Allocator> __result_type; - typedef allocator_traits<typename __result_type::__allocator_type> - __traits; - typename __traits::allocator_type __a2(__a); - __result_type* __p = __traits::allocate(__a2, 1); - __try - { - __traits::construct(__a2, __p, __a); - } - __catch(...) - { - __traits::deallocate(__a2, __p, 1); - __throw_exception_again; - } - return _Ptr<__result_type>(__p); - } - - template<typename _Res, typename _Tp> - static _Ptr<_Result<_Res>> - _S_allocate_result(const std::allocator<_Tp>& __a) - { - return _Ptr<_Result<_Res>>(new _Result<_Res>); - } - - /// Base class for state between a promise and one or more - /// associated futures. - class _State_base - { - typedef _Ptr<_Result_base> _Ptr_type; - - _Ptr_type _M_result; - mutex _M_mutex; - condition_variable _M_cond; - atomic_flag _M_retrieved; - once_flag _M_once; - - public: - _State_base() noexcept : _M_result(), _M_retrieved(ATOMIC_FLAG_INIT) { } - _State_base(const _State_base&) = delete; - _State_base& operator=(const _State_base&) = delete; - virtual ~_State_base(); - - _Result_base& - wait() - { - _M_run_deferred(); - unique_lock<mutex> __lock(_M_mutex); - _M_cond.wait(__lock, [&] { return _M_ready(); }); - return *_M_result; - } - - template<typename _Rep, typename _Period> - future_status - wait_for(const chrono::duration<_Rep, _Period>& __rel) - { - unique_lock<mutex> __lock(_M_mutex); - if (_M_cond.wait_for(__lock, __rel, [&] { return _M_ready(); })) - return future_status::ready; - return future_status::timeout; - } - - template<typename _Clock, typename _Duration> - future_status - wait_until(const chrono::time_point<_Clock, _Duration>& __abs) - { - unique_lock<mutex> __lock(_M_mutex); - if (_M_cond.wait_until(__lock, __abs, [&] { return _M_ready(); })) - return future_status::ready; - return future_status::timeout; - } - - void - _M_set_result(function<_Ptr_type()> __res, bool __ignore_failure = false) - { - bool __set = __ignore_failure; - // all calls to this function are serialized, - // side-effects of invoking __res only happen once - call_once(_M_once, &_State_base::_M_do_set, this, ref(__res), - ref(__set)); - if (!__set) - __throw_future_error(int(future_errc::promise_already_satisfied)); - } - - void - _M_break_promise(_Ptr_type __res) - { - if (static_cast<bool>(__res)) - { - error_code __ec(make_error_code(future_errc::broken_promise)); - __res->_M_error = copy_exception(future_error(__ec)); - { - lock_guard<mutex> __lock(_M_mutex); - _M_result.swap(__res); - } - _M_cond.notify_all(); - } - } - - // Called when this object is passed to a future. - void - _M_set_retrieved_flag() - { - if (_M_retrieved.test_and_set()) - __throw_future_error(int(future_errc::future_already_retrieved)); - } - - template<typename _Res, typename _Arg> - struct _Setter; - - // set lvalues - template<typename _Res, typename _Arg> - struct _Setter<_Res, _Arg&> - { - // check this is only used by promise<R>::set_value(const R&) - // or promise<R>::set_value(R&) - static_assert(is_same<_Res, _Arg&>::value // promise<R&> - || is_same<const _Res, _Arg>::value, // promise<R> - "Invalid specialisation"); - - typename promise<_Res>::_Ptr_type operator()() - { - _State_base::_S_check(_M_promise->_M_future); - _M_promise->_M_storage->_M_set(_M_arg); - return std::move(_M_promise->_M_storage); - } - promise<_Res>* _M_promise; - _Arg& _M_arg; - }; - - // set rvalues - template<typename _Res> - struct _Setter<_Res, _Res&&> - { - typename promise<_Res>::_Ptr_type operator()() - { - _State_base::_S_check(_M_promise->_M_future); - _M_promise->_M_storage->_M_set(std::move(_M_arg)); - return std::move(_M_promise->_M_storage); - } - promise<_Res>* _M_promise; - _Res& _M_arg; - }; - - struct __exception_ptr_tag { }; - - // set exceptions - template<typename _Res> - struct _Setter<_Res, __exception_ptr_tag> - { - typename promise<_Res>::_Ptr_type operator()() - { - _State_base::_S_check(_M_promise->_M_future); - _M_promise->_M_storage->_M_error = _M_ex; - return std::move(_M_promise->_M_storage); - } - - promise<_Res>* _M_promise; - exception_ptr& _M_ex; - }; - - template<typename _Res, typename _Arg> - static _Setter<_Res, _Arg&&> - __setter(promise<_Res>* __prom, _Arg&& __arg) - { - return _Setter<_Res, _Arg&&>{ __prom, __arg }; - } - - template<typename _Res> - static _Setter<_Res, __exception_ptr_tag> - __setter(exception_ptr& __ex, promise<_Res>* __prom) - { - return _Setter<_Res, __exception_ptr_tag>{ __prom, __ex }; - } - - static _Setter<void, void> - __setter(promise<void>* __prom); - - template<typename _Tp> - static void - _S_check(const shared_ptr<_Tp>& __p) - { - if (!static_cast<bool>(__p)) - __throw_future_error((int)future_errc::no_state); - } - - private: - void - _M_do_set(function<_Ptr_type()>& __f, bool& __set) - { - _Ptr_type __res = __f(); - { - lock_guard<mutex> __lock(_M_mutex); - _M_result.swap(__res); - } - _M_cond.notify_all(); - __set = true; - } - - bool _M_ready() const noexcept { return static_cast<bool>(_M_result); } - - // Misnamed: waits for completion of async function. - virtual void _M_run_deferred() { } - }; - - template<typename _BoundFn, typename = typename _BoundFn::result_type> - class _Deferred_state; - - class _Async_state_common; - - template<typename _BoundFn, typename = typename _BoundFn::result_type> - class _Async_state_impl; - - template<typename _Signature> - class _Task_state_base; - - template<typename _Fn, typename _Alloc, typename _Signature> - class _Task_state; - - template<typename _BoundFn> - static std::shared_ptr<_State_base> - _S_make_deferred_state(_BoundFn&& __fn); - - template<typename _BoundFn> - static std::shared_ptr<_State_base> - _S_make_async_state(_BoundFn&& __fn); - - template<typename _Res_ptr, - typename _Res = typename _Res_ptr::element_type::result_type> - struct _Task_setter; - - template<typename _Res_ptr, typename _BoundFn> - static _Task_setter<_Res_ptr> - _S_task_setter(_Res_ptr& __ptr, _BoundFn&& __call) - { - return _Task_setter<_Res_ptr>{ __ptr, std::ref(__call) }; - } - }; - - /// Partial specialization for reference types. - template<typename _Res> - struct __future_base::_Result<_Res&> : __future_base::_Result_base - { - typedef _Res& result_type; - - _Result() noexcept : _M_value_ptr() { } - - void _M_set(_Res& __res) noexcept { _M_value_ptr = &__res; } - - _Res& _M_get() noexcept { return *_M_value_ptr; } - - private: - _Res* _M_value_ptr; - - void _M_destroy() { delete this; } - }; - - /// Explicit specialization for void. - template<> - struct __future_base::_Result<void> : __future_base::_Result_base - { - typedef void result_type; - - private: - void _M_destroy() { delete this; } - }; - - - /// Common implementation for future and shared_future. - template<typename _Res> - class __basic_future : public __future_base - { - protected: - typedef shared_ptr<_State_base> __state_type; - typedef __future_base::_Result<_Res>& __result_type; - - private: - __state_type _M_state; - - public: - // Disable copying. - __basic_future(const __basic_future&) = delete; - __basic_future& operator=(const __basic_future&) = delete; - - bool - valid() const noexcept { return static_cast<bool>(_M_state); } - - void - wait() const - { - _State_base::_S_check(_M_state); - _M_state->wait(); - } - - template<typename _Rep, typename _Period> - future_status - wait_for(const chrono::duration<_Rep, _Period>& __rel) const - { - _State_base::_S_check(_M_state); - return _M_state->wait_for(__rel); - } - - template<typename _Clock, typename _Duration> - future_status - wait_until(const chrono::time_point<_Clock, _Duration>& __abs) const - { - _State_base::_S_check(_M_state); - return _M_state->wait_until(__abs); - } - - protected: - /// Wait for the state to be ready and rethrow any stored exception - __result_type - _M_get_result() const - { - _State_base::_S_check(_M_state); - _Result_base& __res = _M_state->wait(); - if (!(__res._M_error == 0)) - rethrow_exception(__res._M_error); - return static_cast<__result_type>(__res); - } - - void _M_swap(__basic_future& __that) noexcept - { - _M_state.swap(__that._M_state); - } - - // Construction of a future by promise::get_future() - explicit - __basic_future(const __state_type& __state) : _M_state(__state) - { - _State_base::_S_check(_M_state); - _M_state->_M_set_retrieved_flag(); - } - - // Copy construction from a shared_future - explicit - __basic_future(const shared_future<_Res>&) noexcept; - - // Move construction from a shared_future - explicit - __basic_future(shared_future<_Res>&&) noexcept; - - // Move construction from a future - explicit - __basic_future(future<_Res>&&) noexcept; - - constexpr __basic_future() noexcept : _M_state() { } - - struct _Reset - { - explicit _Reset(__basic_future& __fut) noexcept : _M_fut(__fut) { } - ~_Reset() { _M_fut._M_state.reset(); } - __basic_future& _M_fut; - }; - }; - - - /// Primary template for future. - template<typename _Res> - class future : public __basic_future<_Res> - { - friend class promise<_Res>; - template<typename> friend class packaged_task; - template<typename _Fn, typename... _Args> - friend future<typename result_of<_Fn(_Args...)>::type> - async(launch, _Fn&&, _Args&&...); - - typedef __basic_future<_Res> _Base_type; - typedef typename _Base_type::__state_type __state_type; - - explicit - future(const __state_type& __state) : _Base_type(__state) { } - - public: - constexpr future() noexcept : _Base_type() { } - - /// Move constructor - future(future&& __uf) noexcept : _Base_type(std::move(__uf)) { } - - // Disable copying - future(const future&) = delete; - future& operator=(const future&) = delete; - - future& operator=(future&& __fut) noexcept - { - future(std::move(__fut))._M_swap(*this); - return *this; - } - - /// Retrieving the value - _Res - get() - { - typename _Base_type::_Reset __reset(*this); - return std::move(this->_M_get_result()._M_value()); - } - - shared_future<_Res> share(); - }; - - /// Partial specialization for future<R&> - template<typename _Res> - class future<_Res&> : public __basic_future<_Res&> - { - friend class promise<_Res&>; - template<typename> friend class packaged_task; - template<typename _Fn, typename... _Args> - friend future<typename result_of<_Fn(_Args...)>::type> - async(launch, _Fn&&, _Args&&...); - - typedef __basic_future<_Res&> _Base_type; - typedef typename _Base_type::__state_type __state_type; - - explicit - future(const __state_type& __state) : _Base_type(__state) { } - - public: - constexpr future() noexcept : _Base_type() { } - - /// Move constructor - future(future&& __uf) noexcept : _Base_type(std::move(__uf)) { } - - // Disable copying - future(const future&) = delete; - future& operator=(const future&) = delete; - - future& operator=(future&& __fut) noexcept - { - future(std::move(__fut))._M_swap(*this); - return *this; - } - - /// Retrieving the value - _Res& - get() - { - typename _Base_type::_Reset __reset(*this); - return this->_M_get_result()._M_get(); - } - - shared_future<_Res&> share(); - }; - - /// Explicit specialization for future<void> - template<> - class future<void> : public __basic_future<void> - { - friend class promise<void>; - template<typename> friend class packaged_task; - template<typename _Fn, typename... _Args> - friend future<typename result_of<_Fn(_Args...)>::type> - async(launch, _Fn&&, _Args&&...); - - typedef __basic_future<void> _Base_type; - typedef typename _Base_type::__state_type __state_type; - - explicit - future(const __state_type& __state) : _Base_type(__state) { } - - public: - constexpr future() noexcept : _Base_type() { } - - /// Move constructor - future(future&& __uf) noexcept : _Base_type(std::move(__uf)) { } - - // Disable copying - future(const future&) = delete; - future& operator=(const future&) = delete; - - future& operator=(future&& __fut) noexcept - { - future(std::move(__fut))._M_swap(*this); - return *this; - } - - /// Retrieving the value - void - get() - { - typename _Base_type::_Reset __reset(*this); - this->_M_get_result(); - } - - shared_future<void> share(); - }; - - - /// Primary template for shared_future. - template<typename _Res> - class shared_future : public __basic_future<_Res> - { - typedef __basic_future<_Res> _Base_type; - - public: - constexpr shared_future() noexcept : _Base_type() { } - - /// Copy constructor - shared_future(const shared_future& __sf) : _Base_type(__sf) { } - - /// Construct from a future rvalue - shared_future(future<_Res>&& __uf) noexcept - : _Base_type(std::move(__uf)) - { } - - /// Construct from a shared_future rvalue - shared_future(shared_future&& __sf) noexcept - : _Base_type(std::move(__sf)) - { } - - shared_future& operator=(const shared_future& __sf) - { - shared_future(__sf)._M_swap(*this); - return *this; - } - - shared_future& operator=(shared_future&& __sf) noexcept - { - shared_future(std::move(__sf))._M_swap(*this); - return *this; - } - - /// Retrieving the value - const _Res& - get() const { return this->_M_get_result()._M_value(); } - }; - - /// Partial specialization for shared_future<R&> - template<typename _Res> - class shared_future<_Res&> : public __basic_future<_Res&> - { - typedef __basic_future<_Res&> _Base_type; - - public: - constexpr shared_future() noexcept : _Base_type() { } - - /// Copy constructor - shared_future(const shared_future& __sf) : _Base_type(__sf) { } - - /// Construct from a future rvalue - shared_future(future<_Res&>&& __uf) noexcept - : _Base_type(std::move(__uf)) - { } - - /// Construct from a shared_future rvalue - shared_future(shared_future&& __sf) noexcept - : _Base_type(std::move(__sf)) - { } - - shared_future& operator=(const shared_future& __sf) - { - shared_future(__sf)._M_swap(*this); - return *this; - } - - shared_future& operator=(shared_future&& __sf) noexcept - { - shared_future(std::move(__sf))._M_swap(*this); - return *this; - } - - /// Retrieving the value - _Res& - get() const { return this->_M_get_result()._M_get(); } - }; - - /// Explicit specialization for shared_future<void> - template<> - class shared_future<void> : public __basic_future<void> - { - typedef __basic_future<void> _Base_type; - - public: - constexpr shared_future() noexcept : _Base_type() { } - - /// Copy constructor - shared_future(const shared_future& __sf) : _Base_type(__sf) { } - - /// Construct from a future rvalue - shared_future(future<void>&& __uf) noexcept - : _Base_type(std::move(__uf)) - { } - - /// Construct from a shared_future rvalue - shared_future(shared_future&& __sf) noexcept - : _Base_type(std::move(__sf)) - { } - - shared_future& operator=(const shared_future& __sf) - { - shared_future(__sf)._M_swap(*this); - return *this; - } - - shared_future& operator=(shared_future&& __sf) noexcept - { - shared_future(std::move(__sf))._M_swap(*this); - return *this; - } - - // Retrieving the value - void - get() const { this->_M_get_result(); } - }; - - // Now we can define the protected __basic_future constructors. - template<typename _Res> - inline __basic_future<_Res>:: - __basic_future(const shared_future<_Res>& __sf) noexcept - : _M_state(__sf._M_state) - { } - - template<typename _Res> - inline __basic_future<_Res>:: - __basic_future(shared_future<_Res>&& __sf) noexcept - : _M_state(std::move(__sf._M_state)) - { } - - template<typename _Res> - inline __basic_future<_Res>:: - __basic_future(future<_Res>&& __uf) noexcept - : _M_state(std::move(__uf._M_state)) - { } - - template<typename _Res> - inline shared_future<_Res> - future<_Res>::share() - { return shared_future<_Res>(std::move(*this)); } - - template<typename _Res> - inline shared_future<_Res&> - future<_Res&>::share() - { return shared_future<_Res&>(std::move(*this)); } - - inline shared_future<void> - future<void>::share() - { return shared_future<void>(std::move(*this)); } - - /// Primary template for promise - template<typename _Res> - class promise - { - typedef __future_base::_State_base _State; - typedef __future_base::_Result<_Res> _Res_type; - typedef __future_base::_Ptr<_Res_type> _Ptr_type; - template<typename, typename> friend class _State::_Setter; - - shared_ptr<_State> _M_future; - _Ptr_type _M_storage; - - public: - promise() - : _M_future(std::make_shared<_State>()), - _M_storage(new _Res_type()) - { } - - promise(promise&& __rhs) noexcept - : _M_future(std::move(__rhs._M_future)), - _M_storage(std::move(__rhs._M_storage)) - { } - - template<typename _Allocator> - promise(allocator_arg_t, const _Allocator& __a) - : _M_future(std::allocate_shared<_State>(__a)), - _M_storage(__future_base::_S_allocate_result<_Res>(__a)) - { } - - template<typename _Allocator> - promise(allocator_arg_t, const _Allocator&, promise&& __rhs) - : _M_future(std::move(__rhs._M_future)), - _M_storage(std::move(__rhs._M_storage)) - { } - - promise(const promise&) = delete; - - ~promise() - { - if (static_cast<bool>(_M_future) && !_M_future.unique()) - _M_future->_M_break_promise(std::move(_M_storage)); - } - - // Assignment - promise& - operator=(promise&& __rhs) noexcept - { - promise(std::move(__rhs)).swap(*this); - return *this; - } - - promise& operator=(const promise&) = delete; - - void - swap(promise& __rhs) noexcept - { - _M_future.swap(__rhs._M_future); - _M_storage.swap(__rhs._M_storage); - } - - // Retrieving the result - future<_Res> - get_future() - { return future<_Res>(_M_future); } - - // Setting the result - void - set_value(const _Res& __r) - { - auto __setter = _State::__setter(this, __r); - _M_future->_M_set_result(std::move(__setter)); - } - - void - set_value(_Res&& __r) - { - auto __setter = _State::__setter(this, std::move(__r)); - _M_future->_M_set_result(std::move(__setter)); - } - - void - set_exception(exception_ptr __p) - { - auto __setter = _State::__setter(__p, this); - _M_future->_M_set_result(std::move(__setter)); - } - }; - - template<typename _Res> - inline void - swap(promise<_Res>& __x, promise<_Res>& __y) noexcept - { __x.swap(__y); } - - template<typename _Res, typename _Alloc> - struct uses_allocator<promise<_Res>, _Alloc> - : public true_type { }; - - - /// Partial specialization for promise<R&> - template<typename _Res> - class promise<_Res&> - { - typedef __future_base::_State_base _State; - typedef __future_base::_Result<_Res&> _Res_type; - typedef __future_base::_Ptr<_Res_type> _Ptr_type; - template<typename, typename> friend class _State::_Setter; - - shared_ptr<_State> _M_future; - _Ptr_type _M_storage; - - public: - promise() - : _M_future(std::make_shared<_State>()), - _M_storage(new _Res_type()) - { } - - promise(promise&& __rhs) noexcept - : _M_future(std::move(__rhs._M_future)), - _M_storage(std::move(__rhs._M_storage)) - { } - - template<typename _Allocator> - promise(allocator_arg_t, const _Allocator& __a) - : _M_future(std::allocate_shared<_State>(__a)), - _M_storage(__future_base::_S_allocate_result<_Res&>(__a)) - { } - - template<typename _Allocator> - promise(allocator_arg_t, const _Allocator&, promise&& __rhs) - : _M_future(std::move(__rhs._M_future)), - _M_storage(std::move(__rhs._M_storage)) - { } - - promise(const promise&) = delete; - - ~promise() - { - if (static_cast<bool>(_M_future) && !_M_future.unique()) - _M_future->_M_break_promise(std::move(_M_storage)); - } - - // Assignment - promise& - operator=(promise&& __rhs) noexcept - { - promise(std::move(__rhs)).swap(*this); - return *this; - } - - promise& operator=(const promise&) = delete; - - void - swap(promise& __rhs) noexcept - { - _M_future.swap(__rhs._M_future); - _M_storage.swap(__rhs._M_storage); - } - - // Retrieving the result - future<_Res&> - get_future() - { return future<_Res&>(_M_future); } - - // Setting the result - void - set_value(_Res& __r) - { - auto __setter = _State::__setter(this, __r); - _M_future->_M_set_result(std::move(__setter)); - } - - void - set_exception(exception_ptr __p) - { - auto __setter = _State::__setter(__p, this); - _M_future->_M_set_result(std::move(__setter)); - } - }; - - /// Explicit specialization for promise<void> - template<> - class promise<void> - { - typedef __future_base::_State_base _State; - typedef __future_base::_Result<void> _Res_type; - typedef __future_base::_Ptr<_Res_type> _Ptr_type; - template<typename, typename> friend class _State::_Setter; - - shared_ptr<_State> _M_future; - _Ptr_type _M_storage; - - public: - promise() - : _M_future(std::make_shared<_State>()), - _M_storage(new _Res_type()) - { } - - promise(promise&& __rhs) noexcept - : _M_future(std::move(__rhs._M_future)), - _M_storage(std::move(__rhs._M_storage)) - { } - - template<typename _Allocator> - promise(allocator_arg_t, const _Allocator& __a) - : _M_future(std::allocate_shared<_State>(__a)), - _M_storage(__future_base::_S_allocate_result<void>(__a)) - { } - - // _GLIBCXX_RESOLVE_LIB_DEFECTS - // 2095. missing constructors needed for uses-allocator construction - template<typename _Allocator> - promise(allocator_arg_t, const _Allocator&, promise&& __rhs) - : _M_future(std::move(__rhs._M_future)), - _M_storage(std::move(__rhs._M_storage)) - { } - - promise(const promise&) = delete; - - ~promise() - { - if (static_cast<bool>(_M_future) && !_M_future.unique()) - _M_future->_M_break_promise(std::move(_M_storage)); - } - - // Assignment - promise& - operator=(promise&& __rhs) noexcept - { - promise(std::move(__rhs)).swap(*this); - return *this; - } - - promise& operator=(const promise&) = delete; - - void - swap(promise& __rhs) noexcept - { - _M_future.swap(__rhs._M_future); - _M_storage.swap(__rhs._M_storage); - } - - // Retrieving the result - future<void> - get_future() - { return future<void>(_M_future); } - - // Setting the result - void set_value(); - - void - set_exception(exception_ptr __p) - { - auto __setter = _State::__setter(__p, this); - _M_future->_M_set_result(std::move(__setter)); - } - }; - - // set void - template<> - struct __future_base::_State_base::_Setter<void, void> - { - promise<void>::_Ptr_type operator()() - { - _State_base::_S_check(_M_promise->_M_future); - return std::move(_M_promise->_M_storage); - } - - promise<void>* _M_promise; - }; - - inline __future_base::_State_base::_Setter<void, void> - __future_base::_State_base::__setter(promise<void>* __prom) - { - return _Setter<void, void>{ __prom }; - } - - inline void - promise<void>::set_value() - { - auto __setter = _State::__setter(this); - _M_future->_M_set_result(std::move(__setter)); - } - - - template<typename _Ptr_type, typename _Res> - struct __future_base::_Task_setter - { - _Ptr_type operator()() - { - __try - { - _M_result->_M_set(_M_fn()); - } - __catch(...) - { - _M_result->_M_error = current_exception(); - } - return std::move(_M_result); - } - _Ptr_type& _M_result; - std::function<_Res()> _M_fn; - }; - - template<typename _Ptr_type> - struct __future_base::_Task_setter<_Ptr_type, void> - { - _Ptr_type operator()() - { - __try - { - _M_fn(); - } - __catch(...) - { - _M_result->_M_error = current_exception(); - } - return std::move(_M_result); - } - _Ptr_type& _M_result; - std::function<void()> _M_fn; - }; - - template<typename _Res, typename... _Args> - struct __future_base::_Task_state_base<_Res(_Args...)> - : __future_base::_State_base - { - typedef _Res _Res_type; - - template<typename _Alloc> - _Task_state_base(const _Alloc& __a) - : _M_result(_S_allocate_result<_Res>(__a)) - { } - - virtual void - _M_run(_Args... __args) = 0; - - virtual shared_ptr<_Task_state_base> - _M_reset() = 0; - - typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type; - _Ptr_type _M_result; - }; - - template<typename _Fn, typename _Alloc, typename _Res, typename... _Args> - struct __future_base::_Task_state<_Fn, _Alloc, _Res(_Args...)> final - : __future_base::_Task_state_base<_Res(_Args...)> - { - _Task_state(_Fn&& __fn, const _Alloc& __a) - : _Task_state_base<_Res(_Args...)>(__a), _M_impl(std::move(__fn), __a) - { } - - private: - virtual void - _M_run(_Args... __args) - { - // bound arguments decay so wrap lvalue references - auto __boundfn = std::__bind_simple(std::ref(_M_impl._M_fn), - _S_maybe_wrap_ref(std::forward<_Args>(__args))...); - auto __setter = _S_task_setter(this->_M_result, std::move(__boundfn)); - this->_M_set_result(std::move(__setter)); - } - - virtual shared_ptr<_Task_state_base<_Res(_Args...)>> - _M_reset(); - - template<typename _Tp> - static reference_wrapper<_Tp> - _S_maybe_wrap_ref(_Tp& __t) - { return std::ref(__t); } - - template<typename _Tp> - static - typename enable_if<!is_lvalue_reference<_Tp>::value, _Tp>::type&& - _S_maybe_wrap_ref(_Tp&& __t) - { return std::forward<_Tp>(__t); } - - struct _Impl : _Alloc - { - _Impl(_Fn&& __fn, const _Alloc& __a) - : _Alloc(__a), _M_fn(std::move(__fn)) { } - _Fn _M_fn; - } _M_impl; - }; - - template<typename _Signature, typename _Fn, typename _Alloc> - static shared_ptr<__future_base::_Task_state_base<_Signature>> - __create_task_state(_Fn&& __fn, const _Alloc& __a) - { - typedef __future_base::_Task_state<_Fn, _Alloc, _Signature> _State; - return std::allocate_shared<_State>(__a, std::move(__fn), __a); - } - - template<typename _Fn, typename _Alloc, typename _Res, typename... _Args> - shared_ptr<__future_base::_Task_state_base<_Res(_Args...)>> - __future_base::_Task_state<_Fn, _Alloc, _Res(_Args...)>::_M_reset() - { - return __create_task_state<_Res(_Args...)>(std::move(_M_impl._M_fn), - static_cast<_Alloc&>(_M_impl)); - } - - template<typename _Task, typename _Fn, bool - = is_same<_Task, typename decay<_Fn>::type>::value> - struct __constrain_pkgdtask - { typedef void __type; }; - - template<typename _Task, typename _Fn> - struct __constrain_pkgdtask<_Task, _Fn, true> - { }; - - /// packaged_task - template<typename _Res, typename... _ArgTypes> - class packaged_task<_Res(_ArgTypes...)> - { - typedef __future_base::_Task_state_base<_Res(_ArgTypes...)> _State_type; - shared_ptr<_State_type> _M_state; - - public: - // Construction and destruction - packaged_task() noexcept { } - - // _GLIBCXX_RESOLVE_LIB_DEFECTS - // 2095. missing constructors needed for uses-allocator construction - template<typename _Allocator> - packaged_task(allocator_arg_t, const _Allocator& __a) noexcept - { } - - template<typename _Fn, typename = typename - __constrain_pkgdtask<packaged_task, _Fn>::__type> - explicit - packaged_task(_Fn&& __fn) - : packaged_task(allocator_arg, std::allocator<int>(), std::move(__fn)) - { } - - // _GLIBCXX_RESOLVE_LIB_DEFECTS - // 2097. packaged_task constructors should be constrained - template<typename _Fn, typename _Alloc, typename = typename - __constrain_pkgdtask<packaged_task, _Fn>::__type> - explicit - packaged_task(allocator_arg_t, const _Alloc& __a, _Fn&& __fn) - : _M_state(__create_task_state<_Res(_ArgTypes...)>( - std::forward<_Fn>(__fn), __a)) - { } - - ~packaged_task() - { - if (static_cast<bool>(_M_state) && !_M_state.unique()) - _M_state->_M_break_promise(std::move(_M_state->_M_result)); - } - - // No copy - packaged_task(const packaged_task&) = delete; - packaged_task& operator=(const packaged_task&) = delete; - - template<typename _Allocator> - packaged_task(allocator_arg_t, const _Allocator&, - const packaged_task&) = delete; - - // Move support - packaged_task(packaged_task&& __other) noexcept - { this->swap(__other); } - - template<typename _Allocator> - packaged_task(allocator_arg_t, const _Allocator&, - packaged_task&& __other) noexcept - { this->swap(__other); } - - packaged_task& operator=(packaged_task&& __other) noexcept - { - packaged_task(std::move(__other)).swap(*this); - return *this; - } - - void - swap(packaged_task& __other) noexcept - { _M_state.swap(__other._M_state); } - - bool - valid() const noexcept - { return static_cast<bool>(_M_state); } - - // Result retrieval - future<_Res> - get_future() - { return future<_Res>(_M_state); } - - // Execution - void - operator()(_ArgTypes... __args) - { - __future_base::_State_base::_S_check(_M_state); - _M_state->_M_run(std::forward<_ArgTypes>(__args)...); - } - - void - reset() - { - __future_base::_State_base::_S_check(_M_state); - packaged_task __tmp; - __tmp._M_state = _M_state; - _M_state = _M_state->_M_reset(); - } - }; - - /// swap - template<typename _Res, typename... _ArgTypes> - inline void - swap(packaged_task<_Res(_ArgTypes...)>& __x, - packaged_task<_Res(_ArgTypes...)>& __y) noexcept - { __x.swap(__y); } - - template<typename _Res, typename _Alloc> - struct uses_allocator<packaged_task<_Res>, _Alloc> - : public true_type { }; - - - template<typename _BoundFn, typename _Res> - class __future_base::_Deferred_state final - : public __future_base::_State_base - { - public: - explicit - _Deferred_state(_BoundFn&& __fn) - : _M_result(new _Result<_Res>()), _M_fn(std::move(__fn)) - { } - - private: - typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type; - _Ptr_type _M_result; - _BoundFn _M_fn; - - virtual void - _M_run_deferred() - { - // safe to call multiple times so ignore failure - _M_set_result(_S_task_setter(_M_result, _M_fn), true); - } - }; - - class __future_base::_Async_state_common : public __future_base::_State_base - { - protected: -#ifdef _GLIBCXX_ASYNC_ABI_COMPAT - ~_Async_state_common(); -#else - ~_Async_state_common() = default; -#endif - - // Allow non-timed waiting functions to block until the thread completes, - // as if joined. - virtual void _M_run_deferred() { _M_join(); } - - void _M_join() { std::call_once(_M_once, &thread::join, ref(_M_thread)); } - - thread _M_thread; - once_flag _M_once; - }; - - template<typename _BoundFn, typename _Res> - class __future_base::_Async_state_impl final - : public __future_base::_Async_state_common - { - public: - explicit - _Async_state_impl(_BoundFn&& __fn) - : _M_result(new _Result<_Res>()), _M_fn(std::move(__fn)) - { - _M_thread = std::thread{ [this] { - _M_set_result(_S_task_setter(_M_result, _M_fn)); - } }; - } - - ~_Async_state_impl() { _M_join(); } - - private: - typedef __future_base::_Ptr<_Result<_Res>> _Ptr_type; - _Ptr_type _M_result; - _BoundFn _M_fn; - }; - - template<typename _BoundFn> - inline std::shared_ptr<__future_base::_State_base> - __future_base::_S_make_deferred_state(_BoundFn&& __fn) - { - typedef typename remove_reference<_BoundFn>::type __fn_type; - typedef _Deferred_state<__fn_type> __state_type; - return std::make_shared<__state_type>(std::move(__fn)); - } - - template<typename _BoundFn> - inline std::shared_ptr<__future_base::_State_base> - __future_base::_S_make_async_state(_BoundFn&& __fn) - { - typedef typename remove_reference<_BoundFn>::type __fn_type; - typedef _Async_state_impl<__fn_type> __state_type; - return std::make_shared<__state_type>(std::move(__fn)); - } - - - /// async - template<typename _Fn, typename... _Args> - future<typename result_of<_Fn(_Args...)>::type> - async(launch __policy, _Fn&& __fn, _Args&&... __args) - { - typedef typename result_of<_Fn(_Args...)>::type result_type; - std::shared_ptr<__future_base::_State_base> __state; - if ((__policy & (launch::async|launch::deferred)) == launch::async) - { - __state = __future_base::_S_make_async_state(std::__bind_simple( - std::forward<_Fn>(__fn), std::forward<_Args>(__args)...)); - } - else - { - __state = __future_base::_S_make_deferred_state(std::__bind_simple( - std::forward<_Fn>(__fn), std::forward<_Args>(__args)...)); - } - return future<result_type>(__state); - } - - /// async, potential overload - template<typename _Fn, typename... _Args> - inline future<typename result_of<_Fn(_Args...)>::type> - async(_Fn&& __fn, _Args&&... __args) - { - return async(launch::async|launch::deferred, std::forward<_Fn>(__fn), - std::forward<_Args>(__args)...); - } - -#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1 - // && ATOMIC_INT_LOCK_FREE - - // @} group futures -_GLIBCXX_END_NAMESPACE_VERSION -} // namespace - -#endif // C++11 - -#endif // _GLIBCXX_FUTURE |