// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// 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_THREAD_H
#define _LIBCPP___THREAD_THREAD_H
#include <__assert>
#include <__condition_variable/condition_variable.h>
#include <__config>
#include <__exception/terminate.h>
#include <__functional/hash.h>
#include <__functional/unary_function.h>
#include <__memory/unique_ptr.h>
#include <__mutex/mutex.h>
#include <__system_error/system_error.h>
#include <__thread/id.h>
#include <__thread/support.h>
#include <__type_traits/decay.h>
#include <__utility/forward.h>
#include <tuple>
#ifndef _LIBCPP_HAS_NO_LOCALIZATION
# include <locale>
# include <sstream>
#endif
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
#if !defined(_LIBCPP_HAS_NO_THREADS)
template <class _Tp>
class __thread_specific_ptr;
class _LIBCPP_EXPORTED_FROM_ABI __thread_struct;
class _LIBCPP_HIDDEN __thread_struct_imp;
class __assoc_sub_state;
_LIBCPP_EXPORTED_FROM_ABI __thread_specific_ptr<__thread_struct>& __thread_local_data();
class _LIBCPP_EXPORTED_FROM_ABI __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_EXPORTED_FROM_ABI __thread_specific_ptr<__thread_struct>& __thread_local_data();
_LIBCPP_HIDDEN static void _LIBCPP_TLS_DESTRUCTOR_CC __at_thread_exit(void*);
public:
typedef _Tp* pointer;
__thread_specific_ptr(const __thread_specific_ptr&) = delete;
__thread_specific_ptr& operator=(const __thread_specific_ptr&) = delete;
~__thread_specific_ptr();
_LIBCPP_HIDE_FROM_ABI pointer get() const { return static_cast<_Tp*>(__libcpp_tls_get(__key_)); }
_LIBCPP_HIDE_FROM_ABI pointer operator*() const { return *get(); }
_LIBCPP_HIDE_FROM_ABI 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_INTERNAL(get() == nullptr, "Attempting to overwrite thread local data");
std::__libcpp_tls_set(__key_, __p);
}
template <>
struct _LIBCPP_TEMPLATE_VIS hash<__thread_id> : public __unary_function<__thread_id, size_t> {
_LIBCPP_HIDE_FROM_ABI size_t operator()(__thread_id __v) const _NOEXCEPT {
return hash<__libcpp_thread_id>()(__v.__id_);
}
};
# ifndef _LIBCPP_HAS_NO_LOCALIZATION
template <class _CharT, class _Traits>
_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, __thread_id __id) {
// [thread.thread.id]/9
// Effects: Inserts the text representation for charT of id into out.
//
// [thread.thread.id]/2
// The text representation for the character type charT of an
// object of type thread::id is an unspecified sequence of charT
// such that, for two objects of type thread::id x and y, if
// x == y is true, the thread::id objects have the same text
// representation, and if x != y is true, the thread::id objects
// have distinct text representations.
//
// Since various flags in the output stream can affect how the
// thread id is represented (e.g. numpunct or showbase), we
// use a temporary stream instead and just output the thread
// id representation as a string.
basic_ostringstream<_CharT, _Traits> __sstr;
__sstr.imbue(locale::classic());
__sstr << __id.__id_;
return __os << __sstr.str();
}
# endif // _LIBCPP_HAS_NO_LOCALIZATION
class _LIBCPP_EXPORTED_FROM_ABI 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_HIDE_FROM_ABI thread() _NOEXCEPT : __t_(_LIBCPP_NULL_THREAD) {}
# ifndef _LIBCPP_CXX03_LANG
template <class _Fp, class... _Args, __enable_if_t<!is_same<__remove_cvref_t<_Fp>, thread>::value, int> = 0>
_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_HIDE_FROM_ABI thread(thread&& __t) _NOEXCEPT : __t_(__t.__t_) { __t.__t_ = _LIBCPP_NULL_THREAD; }
_LIBCPP_HIDE_FROM_ABI thread& operator=(thread&& __t) _NOEXCEPT {
if (!__libcpp_thread_isnull(&__t_))
terminate();
__t_ = __t.__t_;
__t.__t_ = _LIBCPP_NULL_THREAD;
return *this;
}
_LIBCPP_HIDE_FROM_ABI void swap(thread& __t) _NOEXCEPT { std::swap(__t_, __t.__t_); }
_LIBCPP_HIDE_FROM_ABI bool joinable() const _NOEXCEPT { return !__libcpp_thread_isnull(&__t_); }
void join();
void detach();
_LIBCPP_HIDE_FROM_ABI id get_id() const _NOEXCEPT { return __libcpp_thread_get_id(&__t_); }
_LIBCPP_HIDE_FROM_ABI 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_HIDE_FROM_ABI void __thread_execute(tuple<_TSp, _Fp, _Args...>& __t, __tuple_indices<_Indices...>) {
std::__invoke(std::move(std::get<1>(__t)), std::move(std::get<_Indices>(__t))...);
}
template <class _Fp>
_LIBCPP_HIDE_FROM_ABI 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(std::get<0>(*__p.get()).release());
typedef typename __make_tuple_indices<tuple_size<_Fp>::value, 2>::type _Index;
std::__thread_execute(*__p.get(), _Index());
return nullptr;
}
template <class _Fp, class... _Args, __enable_if_t<!is_same<__remove_cvref_t<_Fp>, thread>::value, int> >
thread::thread(_Fp&& __f, _Args&&... __args) {
typedef unique_ptr<__thread_struct> _TSPtr;
_TSPtr __tsp(new __thread_struct);
typedef tuple<_TSPtr, __decay_t<_Fp>, __decay_t<_Args>...> _Gp;
unique_ptr<_Gp> __p(new _Gp(std::move(__tsp), std::forward<_Fp>(__f), std::forward<_Args>(__args)...));
int __ec = std::__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.
_LIBCPP_HIDE_FROM_ABI __thread_invoke_pair(_Fp& __f) : __tsp_(new __thread_struct), __fn_(__f) {}
unique_ptr<__thread_struct> __tsp_;
_Fp __fn_;
};
template <class _Fp>
_LIBCPP_HIDE_FROM_ABI 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 = std::__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_HIDE_FROM_ABI void swap(thread& __x, thread& __y) _NOEXCEPT { __x.swap(__y); }
#endif // !defined(_LIBCPP_HAS_NO_THREADS)
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP___THREAD_THREAD_H
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