// <thread> -*- C++ -*-
-// Copyright (C) 2008-2020 Free Software Foundation, Inc.
+// Copyright (C) 2008-2021 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
# include <bits/c++0x_warning.h>
#else
-#include <bits/c++config.h>
-
-#if defined(_GLIBCXX_HAS_GTHREADS)
-#include <bits/gthr.h>
-
#include <chrono> // std::chrono::*
-#include <memory> // std::unique_ptr
-#include <tuple> // std::tuple
#if __cplusplus > 201703L
# include <compare> // std::strong_ordering
# include <stop_token> // std::stop_source, std::stop_token, std::nostopstate
#endif
+#include <bits/std_thread.h> // std::thread, get_id, yield
+
#ifdef _GLIBCXX_USE_NANOSLEEP
# include <cerrno> // errno, EINTR
# include <time.h> // nanosleep
#endif
-#include <bits/functional_hash.h> // std::hash
-#include <bits/invoke.h> // std::__invoke
-
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
* @{
*/
- /// thread
- class thread
- {
- public:
- // Abstract base class for types that wrap arbitrary functors to be
- // invoked in the new thread of execution.
- struct _State
- {
- virtual ~_State();
- virtual void _M_run() = 0;
- };
- using _State_ptr = unique_ptr<_State>;
-
- typedef __gthread_t native_handle_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<id>;
-
- friend bool
- operator==(id __x, id __y) noexcept;
-
-#if __cpp_lib_three_way_comparison
- friend strong_ordering
- operator<=>(id __x, id __y) noexcept;
-#else
- friend bool
- operator<(id __x, id __y) noexcept;
-#endif
-
- template<class _CharT, class _Traits>
- friend basic_ostream<_CharT, _Traits>&
- operator<<(basic_ostream<_CharT, _Traits>& __out, id __id);
- };
-
- private:
- id _M_id;
-
- // _GLIBCXX_RESOLVE_LIB_DEFECTS
- // 2097. packaged_task constructors should be constrained
- // 3039. Unnecessary decay in thread and packaged_task
- template<typename _Tp>
- using __not_same = __not_<is_same<__remove_cvref_t<_Tp>, thread>>;
-
- public:
- thread() noexcept = default;
-
- template<typename _Callable, typename... _Args,
- typename = _Require<__not_same<_Callable>>>
- explicit
- thread(_Callable&& __f, _Args&&... __args)
- {
- static_assert( __is_invocable<typename decay<_Callable>::type,
- typename decay<_Args>::type...>::value,
- "std::thread arguments must be invocable after conversion to rvalues"
- );
-
-#ifdef GTHR_ACTIVE_PROXY
- // Create a reference to pthread_create, not just the gthr weak symbol.
- auto __depend = reinterpret_cast<void(*)()>(&pthread_create);
-#else
- auto __depend = nullptr;
-#endif
- // A call wrapper holding tuple{DECAY_COPY(__f), DECAY_COPY(__args)...}
- using _Invoker_type = _Invoker<__decayed_tuple<_Callable, _Args...>>;
-
- _M_start_thread(_S_make_state<_Invoker_type>(
- std::forward<_Callable>(__f), std::forward<_Args>(__args)...),
- __depend);
- }
-
- ~thread()
- {
- if (joinable())
- std::terminate();
- }
-
- thread(const thread&) = delete;
-
- thread(thread&& __t) noexcept
- { swap(__t); }
-
- 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();
-
- 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:
- template<typename _Callable>
- struct _State_impl : public _State
- {
- _Callable _M_func;
-
- template<typename... _Args>
- _State_impl(_Args&&... __args)
- : _M_func{{std::forward<_Args>(__args)...}}
- { }
-
- void
- _M_run() { _M_func(); }
- };
-
- void
- _M_start_thread(_State_ptr, void (*)());
-
- template<typename _Callable, typename... _Args>
- static _State_ptr
- _S_make_state(_Args&&... __args)
- {
- using _Impl = _State_impl<_Callable>;
- return _State_ptr{new _Impl{std::forward<_Args>(__args)...}};
- }
-#if _GLIBCXX_THREAD_ABI_COMPAT
- public:
- struct _Impl_base;
- typedef shared_ptr<_Impl_base> __shared_base_type;
- struct _Impl_base
- {
- __shared_base_type _M_this_ptr;
- virtual ~_Impl_base() = default;
- virtual void _M_run() = 0;
- };
-
- private:
- void
- _M_start_thread(__shared_base_type, void (*)());
-
- void
- _M_start_thread(__shared_base_type);
-#endif
-
- private:
- // A call wrapper that does INVOKE(forwarded tuple elements...)
- template<typename _Tuple>
- struct _Invoker
- {
- _Tuple _M_t;
-
- template<typename>
- struct __result;
- template<typename _Fn, typename... _Args>
- struct __result<tuple<_Fn, _Args...>>
- : __invoke_result<_Fn, _Args...>
- { };
-
- template<size_t... _Ind>
- typename __result<_Tuple>::type
- _M_invoke(_Index_tuple<_Ind...>)
- { return std::__invoke(std::get<_Ind>(std::move(_M_t))...); }
-
- typename __result<_Tuple>::type
- operator()()
- {
- using _Indices
- = typename _Build_index_tuple<tuple_size<_Tuple>::value>::__type;
- return _M_invoke(_Indices());
- }
- };
-
- template<typename... _Tp>
- using __decayed_tuple = tuple<typename decay<_Tp>::type...>;
-
- public:
- // Returns a call wrapper that stores
- // tuple{DECAY_COPY(__callable), DECAY_COPY(__args)...}.
- template<typename _Callable, typename... _Args>
- static _Invoker<__decayed_tuple<_Callable, _Args...>>
- __make_invoker(_Callable&& __callable, _Args&&... __args)
- {
- return { __decayed_tuple<_Callable, _Args...>{
- std::forward<_Callable>(__callable), std::forward<_Args>(__args)...
- } };
- }
- };
-
- inline void
- swap(thread& __x, thread& __y) noexcept
- { __x.swap(__y); }
-
- inline bool
- operator==(thread::id __x, thread::id __y) noexcept
- {
- // pthread_equal is undefined if either thread ID is not valid, so we
- // can't safely use __gthread_equal on default-constructed values (nor
- // the non-zero value returned by this_thread::get_id() for
- // single-threaded programs using GNU libc). Assume EqualityComparable.
- return __x._M_thread == __y._M_thread;
- }
+ // std::thread is defined in <bits/std_thread.h>
#if __cpp_lib_three_way_comparison
inline strong_ordering
{ return !(__x < __y); }
#endif // __cpp_lib_three_way_comparison
- // 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)
*/
namespace this_thread
{
- /// get_id
- inline thread::id
- get_id() noexcept
- {
-#ifdef __GLIBC__
- // For the GNU C library pthread_self() is usable without linking to
- // libpthread.so but returns 0, so we cannot use it in single-threaded
- // programs, because this_thread::get_id() != thread::id{} must be true.
- // We know that pthread_t is an integral type in the GNU C library.
- if (!__gthread_active_p())
- return thread::id(1);
-#endif
- return thread::id(__gthread_self());
- }
-
- /// yield
- inline void
- yield() noexcept
- {
-#ifdef _GLIBCXX_USE_SCHED_YIELD
- __gthread_yield();
-#endif
- }
+#ifndef _GLIBCXX_NO_SLEEP
+#ifndef _GLIBCXX_USE_NANOSLEEP
void
__sleep_for(chrono::seconds, chrono::nanoseconds);
+#endif
- /// sleep_for
+ /// this_thread::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 =
+ struct ::timespec __ts =
{
static_cast<std::time_t>(__s.count()),
static_cast<long>(__ns.count())
#endif
}
- /// sleep_until
+ /// this_thread::sleep_until
template<typename _Clock, typename _Duration>
inline void
sleep_until(const chrono::time_point<_Clock, _Duration>& __atime)
__now = _Clock::now();
}
}
- }
-
- // @} group threads
+ } // namespace this_thread
+#endif // ! NO_SLEEP
#ifdef __cpp_lib_jthread
+ /// A thread that can be requested to stop and automatically joined.
class jthread
{
public:
operator=(const jthread&) = delete;
jthread&
- operator=(jthread&&) noexcept = default;
+ operator=(jthread&& __other) noexcept
+ {
+ std::jthread(std::move(__other)).swap(*this);
+ return *this;
+ }
void
swap(jthread& __other) noexcept
thread _M_thread;
};
#endif // __cpp_lib_jthread
+
+ // @} group threads
+
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
-#endif // _GLIBCXX_HAS_GTHREADS
#endif // C++11
#endif // _GLIBCXX_THREAD
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