forked from OSchip/llvm-project
428 lines
9.8 KiB
C++
428 lines
9.8 KiB
C++
// -*- C++ -*-
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//===--------------------------- thread -----------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP_THREAD
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#define _LIBCPP_THREAD
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/*
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thread synopsis
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#define __STDCPP_THREADS__ __cplusplus
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namespace std
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{
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class thread
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{
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public:
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class id;
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typedef pthread_t native_handle_type;
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thread();
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template <class F, class ...Args> explicit thread(F&& f, Args&&... args);
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~thread();
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thread(const thread&) = delete;
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thread(thread&& t);
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thread& operator=(const thread&) = delete;
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thread& operator=(thread&& t);
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void swap(thread& t);
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bool joinable() const;
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void join();
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void detach();
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id get_id() const;
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native_handle_type native_handle();
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static unsigned hardware_concurrency();
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};
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void swap(thread& x, thread& y);
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class thread::id
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{
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public:
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id();
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};
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bool operator==(thread::id x, thread::id y);
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bool operator!=(thread::id x, thread::id y);
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bool operator< (thread::id x, thread::id y);
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bool operator<=(thread::id x, thread::id y);
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bool operator> (thread::id x, thread::id y);
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bool operator>=(thread::id x, thread::id y);
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template<class charT, class traits>
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basic_ostream<charT, traits>&
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operator<<(basic_ostream<charT, traits>& out, thread::id id);
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namespace this_thread
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{
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thread::id get_id();
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void yield();
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template <class Clock, class Duration>
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void sleep_until(const chrono::time_point<Clock, Duration>& abs_time);
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template <class Rep, class Period>
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void sleep_for(const chrono::duration<Rep, Period>& rel_time);
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} // this_thread
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} // std
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*/
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#include <__config>
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#include <iosfwd>
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#include <__functional_base>
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#include <type_traits>
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#include <cstddef>
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#include <functional>
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#include <memory>
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#include <system_error>
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#include <chrono>
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#include <__mutex_base>
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#include <pthread.h>
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#pragma GCC system_header
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#define __STDCPP_THREADS__ __cplusplus
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Tp>
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class __thread_specific_ptr
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{
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pthread_key_t __key_;
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__thread_specific_ptr(const __thread_specific_ptr&);
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__thread_specific_ptr& operator=(const __thread_specific_ptr&);
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static void __at_thread_exit(void*);
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public:
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typedef _Tp* pointer;
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__thread_specific_ptr();
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~__thread_specific_ptr();
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_LIBCPP_INLINE_VISIBILITY
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pointer get() const {return static_cast<_Tp*>(pthread_getspecific(__key_));}
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_LIBCPP_INLINE_VISIBILITY
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pointer operator*() const {return *get();}
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_LIBCPP_INLINE_VISIBILITY
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pointer operator->() const {return get();}
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pointer release();
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void reset(pointer __p = nullptr);
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};
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template <class _Tp>
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void
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__thread_specific_ptr<_Tp>::__at_thread_exit(void* __p)
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{
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delete static_cast<pointer>(__p);
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}
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template <class _Tp>
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__thread_specific_ptr<_Tp>::__thread_specific_ptr()
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{
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int __ec = pthread_key_create(&__key_, &__thread_specific_ptr::__at_thread_exit);
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if (__ec)
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throw system_error(error_code(__ec, system_category()),
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"__thread_specific_ptr construction failed");
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}
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template <class _Tp>
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__thread_specific_ptr<_Tp>::~__thread_specific_ptr()
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{
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pthread_key_delete(__key_);
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}
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template <class _Tp>
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typename __thread_specific_ptr<_Tp>::pointer
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__thread_specific_ptr<_Tp>::release()
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{
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pointer __p = get();
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pthread_setspecific(__key_, 0);
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return __p;
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}
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template <class _Tp>
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void
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__thread_specific_ptr<_Tp>::reset(pointer __p)
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{
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pointer __p_old = get();
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pthread_setspecific(__key_, __p);
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delete __p_old;
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}
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class thread;
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class __thread_id;
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namespace this_thread
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{
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__thread_id get_id();
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} // this_thread
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class _LIBCPP_VISIBLE __thread_id
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{
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// FIXME: pthread_t is a pointer on Darwin but a long on Linux.
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// NULL is the no-thread value on Darwin. Someone needs to check
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// on other platforms. We assume 0 works everywhere for now.
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pthread_t __id_;
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public:
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_LIBCPP_INLINE_VISIBILITY
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__thread_id() : __id_(0) {}
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friend _LIBCPP_INLINE_VISIBILITY
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bool operator==(__thread_id __x, __thread_id __y)
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{return __x.__id_ == __y.__id_;}
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friend _LIBCPP_INLINE_VISIBILITY
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bool operator!=(__thread_id __x, __thread_id __y)
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{return !(__x == __y);}
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friend _LIBCPP_INLINE_VISIBILITY
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bool operator< (__thread_id __x, __thread_id __y)
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{return __x.__id_ < __y.__id_;}
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friend _LIBCPP_INLINE_VISIBILITY
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bool operator<=(__thread_id __x, __thread_id __y)
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{return !(__y < __x);}
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friend _LIBCPP_INLINE_VISIBILITY
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bool operator> (__thread_id __x, __thread_id __y)
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{return __y < __x ;}
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friend _LIBCPP_INLINE_VISIBILITY
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bool operator>=(__thread_id __x, __thread_id __y)
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{return !(__x < __y);}
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template<class _CharT, class _Traits>
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friend
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_LIBCPP_INLINE_VISIBILITY
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basic_ostream<_CharT, _Traits>&
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operator<<(basic_ostream<_CharT, _Traits>& __os, __thread_id __id)
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{return __os << __id.__id_;}
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private:
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_LIBCPP_INLINE_VISIBILITY
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__thread_id(pthread_t __id) : __id_(__id) {}
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friend __thread_id this_thread::get_id();
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friend class _LIBCPP_VISIBLE thread;
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};
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template<class _Tp> struct hash;
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template<>
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struct _LIBCPP_VISIBLE hash<__thread_id>
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: public unary_function<__thread_id, size_t>
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{
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_LIBCPP_INLINE_VISIBILITY
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size_t operator()(__thread_id __v) const
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{
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const size_t* const __p = reinterpret_cast<const size_t*>(&__v);
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return *__p;
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}
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};
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namespace this_thread
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{
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inline _LIBCPP_INLINE_VISIBILITY
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__thread_id
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get_id()
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{
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return pthread_self();
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}
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} // this_thread
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class _LIBCPP_VISIBLE thread
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{
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pthread_t __t_;
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#ifndef _LIBCPP_HAS_NO_DELETED_FUNCTIONS
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thread(const thread&) = delete;
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thread& operator=(const thread&) = delete;
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#else // _LIBCPP_HAS_NO_DELETED_FUNCTIONS
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thread(const thread&);
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thread& operator=(const thread&);
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#endif // _LIBCPP_HAS_NO_DELETED_FUNCTIONS
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public:
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typedef __thread_id id;
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typedef pthread_t native_handle_type;
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_LIBCPP_INLINE_VISIBILITY
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thread() : __t_(0) {}
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#ifndef _LIBCPP_HAS_NO_VARIADICS
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template <class _F, class ..._Args,
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class = typename enable_if
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<
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!is_same<typename decay<_F>::type, thread>::value
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>::type
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>
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explicit thread(_F&& __f, _Args&&... __args);
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#else // _LIBCPP_HAS_NO_VARIADICS
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template <class _F> explicit thread(_F __f);
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#endif
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~thread();
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#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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_LIBCPP_INLINE_VISIBILITY
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thread(thread&& __t) : __t_(__t.__t_) {__t.__t_ = 0;}
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thread& operator=(thread&& __t);
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#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
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_LIBCPP_INLINE_VISIBILITY
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void swap(thread& __t) {_STD::swap(__t_, __t.__t_);}
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_LIBCPP_INLINE_VISIBILITY
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bool joinable() const {return __t_ != 0;}
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void join();
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void detach();
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_LIBCPP_INLINE_VISIBILITY
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id get_id() const {return __t_;}
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_LIBCPP_INLINE_VISIBILITY
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native_handle_type native_handle() {return __t_;}
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static unsigned hardware_concurrency();
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};
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class __assoc_sub_state;
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class __thread_struct_imp;
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class __thread_struct
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{
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__thread_struct_imp* __p_;
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__thread_struct(const __thread_struct&);
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__thread_struct& operator=(const __thread_struct&);
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public:
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__thread_struct();
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~__thread_struct();
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void notify_all_at_thread_exit(condition_variable*, mutex*);
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void __make_ready_at_thread_exit(__assoc_sub_state*);
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};
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__thread_specific_ptr<__thread_struct>& __thread_local_data();
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template <class _F>
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void*
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__thread_proxy(void* __vp)
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{
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__thread_local_data().reset(new __thread_struct);
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std::unique_ptr<_F> __p(static_cast<_F*>(__vp));
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(*__p)();
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return nullptr;
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}
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#ifndef _LIBCPP_HAS_NO_VARIADICS
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template <class _F, class ..._Args,
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class
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>
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thread::thread(_F&& __f, _Args&&... __args)
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{
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typedef decltype(bind(std::forward<_F>(__f), std::forward<_Args>(__args)...)) _G;
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std::unique_ptr<_G> __p(new _G(bind(std::forward<_F>(__f),
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std::forward<_Args>(__args)...)));
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int __ec = pthread_create(&__t_, 0, &__thread_proxy<_G>, __p.get());
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if (__ec == 0)
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__p.release();
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else
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__throw_system_error(__ec, "thread constructor failed");
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}
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#else // _LIBCPP_HAS_NO_VARIADICS
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template <class _F>
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thread::thread(_F __f)
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{
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std::unique_ptr<_F> __p(new _F(__f));
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int __ec = pthread_create(&__t_, 0, &__thread_proxy<_F>, __p.get());
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if (__ec == 0)
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__p.release();
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else
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__throw_system_error(__ec, "thread constructor failed");
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}
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#endif // _LIBCPP_HAS_NO_VARIADICS
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#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
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inline _LIBCPP_INLINE_VISIBILITY
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thread&
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thread::operator=(thread&& __t)
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{
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if (__t_ != 0)
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terminate();
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__t_ = __t.__t_;
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__t.__t_ = 0;
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return *this;
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}
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#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
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inline _LIBCPP_INLINE_VISIBILITY
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void swap(thread& __x, thread& __y) {__x.swap(__y);}
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namespace this_thread
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{
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void sleep_for(const chrono::nanoseconds& ns);
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template <class _Rep, class _Period>
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void
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sleep_for(const chrono::duration<_Rep, _Period>& __d)
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{
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using namespace chrono;
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nanoseconds __ns = duration_cast<nanoseconds>(__d);
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if (__ns < __d)
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++__ns;
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sleep_for(__ns);
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}
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template <class _Clock, class _Duration>
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void
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sleep_until(const chrono::time_point<_Clock, _Duration>& __t)
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{
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using namespace chrono;
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mutex __mut;
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condition_variable __cv;
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unique_lock<mutex> __lk(__mut);
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while (_Clock::now() < __t)
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__cv.wait_until(__lk, __t);
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}
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template <class _Duration>
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inline _LIBCPP_INLINE_VISIBILITY
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void
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sleep_until(const chrono::time_point<chrono::monotonic_clock, _Duration>& __t)
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{
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using namespace chrono;
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sleep_for(__t - monotonic_clock::now());
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}
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inline _LIBCPP_INLINE_VISIBILITY
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void yield() {sched_yield();}
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} // this_thread
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_THREAD
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