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// <thread> -*- C++ -*- // Copyright (C) 2008-2013 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/thread * This is a Standard C++ Library header. */ #ifndef _GLIBCXX_THREAD #define _GLIBCXX_THREAD 1 #pragma GCC system_header #if __cplusplus < 201103L # include <bits/c++0x_warning.h> #else #include <chrono> #include <functional> #include <memory> #include <bits/functexcept.h> #include <bits/functional_hash.h> #include <bits/gthr.h> #if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @defgroup threads Threads * @ingroup concurrency * * Classes for thread support. * @{ */ /// thread class thread { public: typedef __gthread_t native_handle_type; struct _Impl_base; typedef shared_ptr<_Impl_base> __shared_base_type; /// thread::id class id { native_handle_type _M_thread; public: id() noexcept : _M_thread() { } explicit id(native_handle_type __id) : _M_thread(__id) { } private: friend class thread; friend class hash<thread::id>; friend bool operator==(thread::id __x, thread::id __y) noexcept { return __gthread_equal(__x._M_thread, __y._M_thread); } friend bool operator<(thread::id __x, thread::id __y) noexcept { return __x._M_thread < __y._M_thread; } template<class _CharT, class _Traits> friend basic_ostream<_CharT, _Traits>& operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id); }; // Simple base type that the templatized, derived class containing // an arbitrary functor can be converted to and called. struct _Impl_base { __shared_base_type _M_this_ptr; inline virtual ~_Impl_base(); virtual void _M_run() = 0; }; template<typename _Callable> struct _Impl : public _Impl_base { _Callable _M_func; _Impl(_Callable&& __f) : _M_func(std::forward<_Callable>(__f)) { } void _M_run() { _M_func(); } }; private: id _M_id; public: thread() noexcept = default; // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2097. packaged_task constructors should be constrained thread(thread&) = delete; thread(const thread&) = delete; thread(thread&& __t) noexcept { swap(__t); } template<typename _Callable, typename... _Args> explicit thread(_Callable&& __f, _Args&&... __args) { _M_start_thread(_M_make_routine(std::__bind_simple( std::forward<_Callable>(__f), std::forward<_Args>(__args)...))); } ~thread() { if (joinable()) std::terminate(); } thread& operator=(const thread&) = delete; thread& operator=(thread&& __t) noexcept { if (joinable()) std::terminate(); swap(__t); return *this; } void swap(thread& __t) noexcept { std::swap(_M_id, __t._M_id); } bool joinable() const noexcept { return !(_M_id == id()); } void join(); void detach(); thread::id get_id() const noexcept { return _M_id; } /** @pre thread is joinable */ native_handle_type native_handle() { return _M_id._M_thread; } // Returns a value that hints at the number of hardware thread contexts. static unsigned int hardware_concurrency() noexcept; private: void _M_start_thread(__shared_base_type); template<typename _Callable> shared_ptr<_Impl<_Callable>> _M_make_routine(_Callable&& __f) { // Create and allocate full data structure, not base. return std::make_shared<_Impl<_Callable>>(std::forward<_Callable>(__f)); } }; inline thread::_Impl_base::~_Impl_base() = default; inline void swap(thread& __x, thread& __y) noexcept { __x.swap(__y); } inline bool operator!=(thread::id __x, thread::id __y) noexcept { return !(__x == __y); } inline bool operator<=(thread::id __x, thread::id __y) noexcept { return !(__y < __x); } inline bool operator>(thread::id __x, thread::id __y) noexcept { return __y < __x; } inline bool operator>=(thread::id __x, thread::id __y) noexcept { return !(__x < __y); } // DR 889. /// std::hash specialization for thread::id. template<> struct hash<thread::id> : public __hash_base<size_t, thread::id> { size_t operator()(const thread::id& __id) const noexcept { return std::_Hash_impl::hash(__id._M_thread); } }; template<class _CharT, class _Traits> inline basic_ostream<_CharT, _Traits>& operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id) { if (__id == thread::id()) return __out << "thread::id of a non-executing thread"; else return __out << __id._M_thread; } _GLIBCXX_END_NAMESPACE_VERSION /** @namespace std::this_thread * @brief ISO C++ 2011 entities sub-namespace for thread. * 30.3.2 Namespace this_thread. */ namespace this_thread { _GLIBCXX_BEGIN_NAMESPACE_VERSION /// get_id inline thread::id get_id() noexcept { return thread::id(__gthread_self()); } /// yield inline void yield() noexcept { #ifdef _GLIBCXX_USE_SCHED_YIELD __gthread_yield(); #endif } void __sleep_for(chrono::seconds, chrono::nanoseconds); /// sleep_for template<typename _Rep, typename _Period> inline void sleep_for(const chrono::duration<_Rep, _Period>& __rtime) { auto __s = chrono::duration_cast<chrono::seconds>(__rtime); auto __ns = chrono::duration_cast<chrono::nanoseconds>(__rtime - __s); #ifdef _GLIBCXX_USE_NANOSLEEP __gthread_time_t __ts = { static_cast<std::time_t>(__s.count()), static_cast<long>(__ns.count()) }; ::nanosleep(&__ts, 0); #else __sleep_for(__s, __ns); #endif } /// sleep_until template<typename _Clock, typename _Duration> inline void sleep_until(const chrono::time_point<_Clock, _Duration>& __atime) { sleep_for(__atime - _Clock::now()); } _GLIBCXX_END_NAMESPACE_VERSION } // @} group threads } // namespace #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1 #endif // C++11 #endif // _GLIBCXX_THREAD