| // -*- C++ -*- |
| //===--------------------------- thread -----------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP_THREAD |
| #define _LIBCPP_THREAD |
| |
| /* |
| |
| thread synopsis |
| |
| namespace std |
| { |
| |
| class thread |
| { |
| public: |
| class id; |
| typedef pthread_t native_handle_type; |
| |
| thread() noexcept; |
| template <class F, class ...Args> explicit thread(F&& f, Args&&... args); |
| ~thread(); |
| |
| thread(const thread&) = delete; |
| thread(thread&& t) noexcept; |
| |
| thread& operator=(const thread&) = delete; |
| thread& operator=(thread&& t) noexcept; |
| |
| void swap(thread& t) noexcept; |
| |
| bool joinable() const noexcept; |
| void join(); |
| void detach(); |
| id get_id() const noexcept; |
| native_handle_type native_handle(); |
| |
| static unsigned hardware_concurrency() noexcept; |
| }; |
| |
| void swap(thread& x, thread& y) noexcept; |
| |
| class thread::id |
| { |
| public: |
| id() noexcept; |
| }; |
| |
| bool operator==(thread::id x, thread::id y) noexcept; |
| bool operator!=(thread::id x, thread::id y) noexcept; |
| bool operator< (thread::id x, thread::id y) noexcept; |
| bool operator<=(thread::id x, thread::id y) noexcept; |
| bool operator> (thread::id x, thread::id y) noexcept; |
| bool operator>=(thread::id x, thread::id y) noexcept; |
| |
| template<class charT, class traits> |
| basic_ostream<charT, traits>& |
| operator<<(basic_ostream<charT, traits>& out, thread::id id); |
| |
| namespace this_thread |
| { |
| |
| thread::id get_id() noexcept; |
| |
| void yield() noexcept; |
| |
| template <class Clock, class Duration> |
| void sleep_until(const chrono::time_point<Clock, Duration>& abs_time); |
| |
| template <class Rep, class Period> |
| void sleep_for(const chrono::duration<Rep, Period>& rel_time); |
| |
| } // this_thread |
| |
| } // std |
| |
| */ |
| |
| #include <__config> |
| #include <__debug> |
| #include <__functional_base> |
| #include <__mutex_base> |
| #include <__threading_support> |
| #include <__utility/decay_copy.h> |
| #include <__utility/forward.h> |
| #include <chrono> |
| #include <cstddef> |
| #include <functional> |
| #include <iosfwd> |
| #include <memory> |
| #include <system_error> |
| #include <tuple> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_PUSH_MACROS |
| #include <__undef_macros> |
| |
| #ifdef _LIBCPP_HAS_NO_THREADS |
| #error <thread> is not supported on this single threaded system |
| #else // !_LIBCPP_HAS_NO_THREADS |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <class _Tp> class __thread_specific_ptr; |
| class _LIBCPP_TYPE_VIS __thread_struct; |
| class _LIBCPP_HIDDEN __thread_struct_imp; |
| class __assoc_sub_state; |
| |
| _LIBCPP_FUNC_VIS __thread_specific_ptr<__thread_struct>& __thread_local_data(); |
| |
| class _LIBCPP_TYPE_VIS __thread_struct |
| { |
| __thread_struct_imp* __p_; |
| |
| __thread_struct(const __thread_struct&); |
| __thread_struct& operator=(const __thread_struct&); |
| public: |
| __thread_struct(); |
| ~__thread_struct(); |
| |
| void notify_all_at_thread_exit(condition_variable*, mutex*); |
| void __make_ready_at_thread_exit(__assoc_sub_state*); |
| }; |
| |
| template <class _Tp> |
| class __thread_specific_ptr |
| { |
| __libcpp_tls_key __key_; |
| |
| // Only __thread_local_data() may construct a __thread_specific_ptr |
| // and only with _Tp == __thread_struct. |
| static_assert((is_same<_Tp, __thread_struct>::value), ""); |
| __thread_specific_ptr(); |
| friend _LIBCPP_FUNC_VIS __thread_specific_ptr<__thread_struct>& __thread_local_data(); |
| |
| __thread_specific_ptr(const __thread_specific_ptr&); |
| __thread_specific_ptr& operator=(const __thread_specific_ptr&); |
| |
| _LIBCPP_HIDDEN static void _LIBCPP_TLS_DESTRUCTOR_CC __at_thread_exit(void*); |
| |
| public: |
| typedef _Tp* pointer; |
| |
| ~__thread_specific_ptr(); |
| |
| _LIBCPP_INLINE_VISIBILITY |
| pointer get() const {return static_cast<_Tp*>(__libcpp_tls_get(__key_));} |
| _LIBCPP_INLINE_VISIBILITY |
| pointer operator*() const {return *get();} |
| _LIBCPP_INLINE_VISIBILITY |
| pointer operator->() const {return get();} |
| void set_pointer(pointer __p); |
| }; |
| |
| template <class _Tp> |
| void _LIBCPP_TLS_DESTRUCTOR_CC |
| __thread_specific_ptr<_Tp>::__at_thread_exit(void* __p) |
| { |
| delete static_cast<pointer>(__p); |
| } |
| |
| template <class _Tp> |
| __thread_specific_ptr<_Tp>::__thread_specific_ptr() |
| { |
| int __ec = |
| __libcpp_tls_create(&__key_, &__thread_specific_ptr::__at_thread_exit); |
| if (__ec) |
| __throw_system_error(__ec, "__thread_specific_ptr construction failed"); |
| } |
| |
| template <class _Tp> |
| __thread_specific_ptr<_Tp>::~__thread_specific_ptr() |
| { |
| // __thread_specific_ptr is only created with a static storage duration |
| // so this destructor is only invoked during program termination. Invoking |
| // pthread_key_delete(__key_) may prevent other threads from deleting their |
| // thread local data. For this reason we leak the key. |
| } |
| |
| template <class _Tp> |
| void |
| __thread_specific_ptr<_Tp>::set_pointer(pointer __p) |
| { |
| _LIBCPP_ASSERT(get() == nullptr, |
| "Attempting to overwrite thread local data"); |
| __libcpp_tls_set(__key_, __p); |
| } |
| |
| template<> |
| struct _LIBCPP_TEMPLATE_VIS hash<__thread_id> |
| : public unary_function<__thread_id, size_t> |
| { |
| _LIBCPP_INLINE_VISIBILITY |
| size_t operator()(__thread_id __v) const _NOEXCEPT |
| { |
| return hash<__libcpp_thread_id>()(__v.__id_); |
| } |
| }; |
| |
| template<class _CharT, class _Traits> |
| _LIBCPP_INLINE_VISIBILITY |
| basic_ostream<_CharT, _Traits>& |
| operator<<(basic_ostream<_CharT, _Traits>& __os, __thread_id __id) |
| {return __os << __id.__id_;} |
| |
| class _LIBCPP_TYPE_VIS thread |
| { |
| __libcpp_thread_t __t_; |
| |
| thread(const thread&); |
| thread& operator=(const thread&); |
| public: |
| typedef __thread_id id; |
| typedef __libcpp_thread_t native_handle_type; |
| |
| _LIBCPP_INLINE_VISIBILITY |
| thread() _NOEXCEPT : __t_(_LIBCPP_NULL_THREAD) {} |
| #ifndef _LIBCPP_CXX03_LANG |
| template <class _Fp, class ..._Args, |
| class = typename enable_if |
| < |
| !is_same<typename __uncvref<_Fp>::type, thread>::value |
| >::type |
| > |
| _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS |
| explicit thread(_Fp&& __f, _Args&&... __args); |
| #else // _LIBCPP_CXX03_LANG |
| template <class _Fp> |
| _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS |
| explicit thread(_Fp __f); |
| #endif |
| ~thread(); |
| |
| _LIBCPP_INLINE_VISIBILITY |
| thread(thread&& __t) _NOEXCEPT : __t_(__t.__t_) { |
| __t.__t_ = _LIBCPP_NULL_THREAD; |
| } |
| |
| _LIBCPP_INLINE_VISIBILITY |
| thread& operator=(thread&& __t) _NOEXCEPT { |
| if (!__libcpp_thread_isnull(&__t_)) |
| terminate(); |
| __t_ = __t.__t_; |
| __t.__t_ = _LIBCPP_NULL_THREAD; |
| return *this; |
| } |
| |
| _LIBCPP_INLINE_VISIBILITY |
| void swap(thread& __t) _NOEXCEPT {_VSTD::swap(__t_, __t.__t_);} |
| |
| _LIBCPP_INLINE_VISIBILITY |
| bool joinable() const _NOEXCEPT {return !__libcpp_thread_isnull(&__t_);} |
| void join(); |
| void detach(); |
| _LIBCPP_INLINE_VISIBILITY |
| id get_id() const _NOEXCEPT {return __libcpp_thread_get_id(&__t_);} |
| _LIBCPP_INLINE_VISIBILITY |
| native_handle_type native_handle() _NOEXCEPT {return __t_;} |
| |
| static unsigned hardware_concurrency() _NOEXCEPT; |
| }; |
| |
| #ifndef _LIBCPP_CXX03_LANG |
| |
| template <class _TSp, class _Fp, class ..._Args, size_t ..._Indices> |
| inline _LIBCPP_INLINE_VISIBILITY |
| void |
| __thread_execute(tuple<_TSp, _Fp, _Args...>& __t, __tuple_indices<_Indices...>) |
| { |
| _VSTD::__invoke(_VSTD::move(_VSTD::get<1>(__t)), _VSTD::move(_VSTD::get<_Indices>(__t))...); |
| } |
| |
| template <class _Fp> |
| _LIBCPP_INLINE_VISIBILITY |
| void* __thread_proxy(void* __vp) |
| { |
| // _Fp = tuple< unique_ptr<__thread_struct>, Functor, Args...> |
| unique_ptr<_Fp> __p(static_cast<_Fp*>(__vp)); |
| __thread_local_data().set_pointer(_VSTD::get<0>(*__p.get()).release()); |
| typedef typename __make_tuple_indices<tuple_size<_Fp>::value, 2>::type _Index; |
| _VSTD::__thread_execute(*__p.get(), _Index()); |
| return nullptr; |
| } |
| |
| template <class _Fp, class ..._Args, |
| class |
| > |
| thread::thread(_Fp&& __f, _Args&&... __args) |
| { |
| typedef unique_ptr<__thread_struct> _TSPtr; |
| _TSPtr __tsp(new __thread_struct); |
| typedef tuple<_TSPtr, typename decay<_Fp>::type, typename decay<_Args>::type...> _Gp; |
| unique_ptr<_Gp> __p( |
| new _Gp(_VSTD::move(__tsp), |
| _VSTD::__decay_copy(_VSTD::forward<_Fp>(__f)), |
| _VSTD::__decay_copy(_VSTD::forward<_Args>(__args))...)); |
| int __ec = _VSTD::__libcpp_thread_create(&__t_, &__thread_proxy<_Gp>, __p.get()); |
| if (__ec == 0) |
| __p.release(); |
| else |
| __throw_system_error(__ec, "thread constructor failed"); |
| } |
| |
| #else // _LIBCPP_CXX03_LANG |
| |
| template <class _Fp> |
| struct __thread_invoke_pair { |
| // This type is used to pass memory for thread local storage and a functor |
| // to a newly created thread because std::pair doesn't work with |
| // std::unique_ptr in C++03. |
| __thread_invoke_pair(_Fp& __f) : __tsp_(new __thread_struct), __fn_(__f) {} |
| unique_ptr<__thread_struct> __tsp_; |
| _Fp __fn_; |
| }; |
| |
| template <class _Fp> |
| void* __thread_proxy_cxx03(void* __vp) |
| { |
| unique_ptr<_Fp> __p(static_cast<_Fp*>(__vp)); |
| __thread_local_data().set_pointer(__p->__tsp_.release()); |
| (__p->__fn_)(); |
| return nullptr; |
| } |
| |
| template <class _Fp> |
| thread::thread(_Fp __f) |
| { |
| |
| typedef __thread_invoke_pair<_Fp> _InvokePair; |
| typedef unique_ptr<_InvokePair> _PairPtr; |
| _PairPtr __pp(new _InvokePair(__f)); |
| int __ec = _VSTD::__libcpp_thread_create(&__t_, &__thread_proxy_cxx03<_InvokePair>, __pp.get()); |
| if (__ec == 0) |
| __pp.release(); |
| else |
| __throw_system_error(__ec, "thread constructor failed"); |
| } |
| |
| #endif // _LIBCPP_CXX03_LANG |
| |
| inline _LIBCPP_INLINE_VISIBILITY |
| void swap(thread& __x, thread& __y) _NOEXCEPT {__x.swap(__y);} |
| |
| namespace this_thread |
| { |
| |
| _LIBCPP_FUNC_VIS void sleep_for(const chrono::nanoseconds& __ns); |
| |
| template <class _Rep, class _Period> |
| void |
| sleep_for(const chrono::duration<_Rep, _Period>& __d) |
| { |
| if (__d > chrono::duration<_Rep, _Period>::zero()) |
| { |
| // The standard guarantees a 64bit signed integer resolution for nanoseconds, |
| // so use INT64_MAX / 1e9 as cut-off point. Use a constant to avoid <climits> |
| // and issues with long double folding on PowerPC with GCC. |
| _LIBCPP_CONSTEXPR chrono::duration<long double> _Max = |
| chrono::duration<long double>(9223372036.0L); |
| chrono::nanoseconds __ns; |
| if (__d < _Max) |
| { |
| __ns = chrono::duration_cast<chrono::nanoseconds>(__d); |
| if (__ns < __d) |
| ++__ns; |
| } |
| else |
| __ns = chrono::nanoseconds::max(); |
| this_thread::sleep_for(__ns); |
| } |
| } |
| |
| template <class _Clock, class _Duration> |
| void |
| sleep_until(const chrono::time_point<_Clock, _Duration>& __t) |
| { |
| mutex __mut; |
| condition_variable __cv; |
| unique_lock<mutex> __lk(__mut); |
| while (_Clock::now() < __t) |
| __cv.wait_until(__lk, __t); |
| } |
| |
| template <class _Duration> |
| inline _LIBCPP_INLINE_VISIBILITY |
| void |
| sleep_until(const chrono::time_point<chrono::steady_clock, _Duration>& __t) |
| { |
| this_thread::sleep_for(__t - chrono::steady_clock::now()); |
| } |
| |
| inline _LIBCPP_INLINE_VISIBILITY |
| void yield() _NOEXCEPT {__libcpp_thread_yield();} |
| |
| } // this_thread |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // !_LIBCPP_HAS_NO_THREADS |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // _LIBCPP_THREAD |