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// -*- 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___THREADING_SUPPORT
#define _LIBCPP___THREADING_SUPPORT
#include <__availability>
#include <__chrono/convert_to_timespec.h>
#include <__chrono/duration.h>
#include <__compare/ordering.h>
#include <__config>
#include <__fwd/hash.h>
#include <__thread/poll_with_backoff.h>
#include <errno.h>
#include <iosfwd>
#include <limits>
#ifdef __MVS__
# include <__support/ibm/nanosleep.h>
#endif
#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
# pragma GCC system_header
#endif
#if defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
# include <__external_threading>
#elif !defined(_LIBCPP_HAS_NO_THREADS)
#if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
# include <pthread.h>
# include <sched.h>
#elif defined(_LIBCPP_HAS_THREAD_API_C11)
# include <threads.h>
#endif
#if defined(_LIBCPP_HAS_THREAD_LIBRARY_EXTERNAL) || \
defined(_LIBCPP_BUILDING_THREAD_LIBRARY_EXTERNAL) || \
defined(_LIBCPP_HAS_THREAD_API_WIN32)
#define _LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_FUNC_VIS
#else
#define _LIBCPP_THREAD_ABI_VISIBILITY inline _LIBCPP_INLINE_VISIBILITY
#endif
#if defined(__FreeBSD__) && defined(__clang__) && __has_attribute(no_thread_safety_analysis)
#define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS __attribute__((no_thread_safety_analysis))
#else
#define _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
#endif
typedef ::timespec __libcpp_timespec_t;
#endif // !defined(_LIBCPP_HAS_NO_THREADS)
_LIBCPP_BEGIN_NAMESPACE_STD
#if !defined(_LIBCPP_HAS_NO_THREADS)
#if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
// Mutex
typedef pthread_mutex_t __libcpp_mutex_t;
#define _LIBCPP_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
typedef pthread_mutex_t __libcpp_recursive_mutex_t;
// Condition Variable
typedef pthread_cond_t __libcpp_condvar_t;
#define _LIBCPP_CONDVAR_INITIALIZER PTHREAD_COND_INITIALIZER
// Execute once
typedef pthread_once_t __libcpp_exec_once_flag;
#define _LIBCPP_EXEC_ONCE_INITIALIZER PTHREAD_ONCE_INIT
// Thread id
#if defined(__MVS__)
typedef unsigned long long __libcpp_thread_id;
#else
typedef pthread_t __libcpp_thread_id;
#endif
// Thread
#define _LIBCPP_NULL_THREAD ((__libcpp_thread_t()))
typedef pthread_t __libcpp_thread_t;
// Thread Local Storage
typedef pthread_key_t __libcpp_tls_key;
#define _LIBCPP_TLS_DESTRUCTOR_CC
#elif defined(_LIBCPP_HAS_THREAD_API_C11)
// Mutex
typedef mtx_t __libcpp_mutex_t;
// mtx_t is a struct so using {} for initialization is valid.
#define _LIBCPP_MUTEX_INITIALIZER {}
typedef mtx_t __libcpp_recursive_mutex_t;
// Condition Variable
typedef cnd_t __libcpp_condvar_t;
// cnd_t is a struct so using {} for initialization is valid.
#define _LIBCPP_CONDVAR_INITIALIZER {}
// Execute once
typedef once_flag __libcpp_exec_once_flag;
#define _LIBCPP_EXEC_ONCE_INITIALIZER ONCE_FLAG_INIT
// Thread id
typedef thrd_t __libcpp_thread_id;
// Thread
#define _LIBCPP_NULL_THREAD 0U
typedef thrd_t __libcpp_thread_t;
// Thread Local Storage
typedef tss_t __libcpp_tls_key;
#define _LIBCPP_TLS_DESTRUCTOR_CC
#elif !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
// Mutex
typedef void* __libcpp_mutex_t;
#define _LIBCPP_MUTEX_INITIALIZER 0
#if defined(_M_IX86) || defined(__i386__) || defined(_M_ARM) || defined(__arm__)
typedef void* __libcpp_recursive_mutex_t[6];
#elif defined(_M_AMD64) || defined(__x86_64__) || defined(_M_ARM64) || defined(__aarch64__)
typedef void* __libcpp_recursive_mutex_t[5];
#else
# error Unsupported architecture
#endif
// Condition Variable
typedef void* __libcpp_condvar_t;
#define _LIBCPP_CONDVAR_INITIALIZER 0
// Execute Once
typedef void* __libcpp_exec_once_flag;
#define _LIBCPP_EXEC_ONCE_INITIALIZER 0
// Thread ID
typedef long __libcpp_thread_id;
// Thread
#define _LIBCPP_NULL_THREAD 0U
typedef void* __libcpp_thread_t;
// Thread Local Storage
typedef long __libcpp_tls_key;
#define _LIBCPP_TLS_DESTRUCTOR_CC __stdcall
#endif // !defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
#if !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
// Mutex
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_recursive_mutex_init(__libcpp_recursive_mutex_t *__m);
_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
int __libcpp_recursive_mutex_lock(__libcpp_recursive_mutex_t *__m);
_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
bool __libcpp_recursive_mutex_trylock(__libcpp_recursive_mutex_t *__m);
_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
int __libcpp_recursive_mutex_unlock(__libcpp_recursive_mutex_t *__m);
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_recursive_mutex_destroy(__libcpp_recursive_mutex_t *__m);
_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
int __libcpp_mutex_lock(__libcpp_mutex_t *__m);
_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
bool __libcpp_mutex_trylock(__libcpp_mutex_t *__m);
_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
int __libcpp_mutex_unlock(__libcpp_mutex_t *__m);
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_mutex_destroy(__libcpp_mutex_t *__m);
// Condition variable
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_condvar_signal(__libcpp_condvar_t* __cv);
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_condvar_broadcast(__libcpp_condvar_t* __cv);
_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
int __libcpp_condvar_wait(__libcpp_condvar_t* __cv, __libcpp_mutex_t* __m);
_LIBCPP_THREAD_ABI_VISIBILITY _LIBCPP_NO_THREAD_SAFETY_ANALYSIS
int __libcpp_condvar_timedwait(__libcpp_condvar_t *__cv, __libcpp_mutex_t *__m,
__libcpp_timespec_t *__ts);
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_condvar_destroy(__libcpp_condvar_t* __cv);
// Execute once
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_execute_once(__libcpp_exec_once_flag *__flag,
void (*__init_routine)());
// Thread id
_LIBCPP_THREAD_ABI_VISIBILITY
bool __libcpp_thread_id_equal(__libcpp_thread_id __t1, __libcpp_thread_id __t2);
_LIBCPP_THREAD_ABI_VISIBILITY
bool __libcpp_thread_id_less(__libcpp_thread_id __t1, __libcpp_thread_id __t2);
// Thread
_LIBCPP_THREAD_ABI_VISIBILITY
bool __libcpp_thread_isnull(const __libcpp_thread_t *__t);
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_thread_create(__libcpp_thread_t *__t, void *(*__func)(void *),
void *__arg);
_LIBCPP_THREAD_ABI_VISIBILITY
__libcpp_thread_id __libcpp_thread_get_current_id();
_LIBCPP_THREAD_ABI_VISIBILITY
__libcpp_thread_id __libcpp_thread_get_id(const __libcpp_thread_t *__t);
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_thread_join(__libcpp_thread_t *__t);
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_thread_detach(__libcpp_thread_t *__t);
_LIBCPP_THREAD_ABI_VISIBILITY
void __libcpp_thread_yield();
_LIBCPP_THREAD_ABI_VISIBILITY
void __libcpp_thread_sleep_for(const chrono::nanoseconds& __ns);
// Thread local storage
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_tls_create(__libcpp_tls_key* __key,
void(_LIBCPP_TLS_DESTRUCTOR_CC* __at_exit)(void*));
_LIBCPP_THREAD_ABI_VISIBILITY
void *__libcpp_tls_get(__libcpp_tls_key __key);
_LIBCPP_THREAD_ABI_VISIBILITY
int __libcpp_tls_set(__libcpp_tls_key __key, void *__p);
#endif // !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
#if (!defined(_LIBCPP_HAS_THREAD_LIBRARY_EXTERNAL) || \
defined(_LIBCPP_BUILDING_THREAD_LIBRARY_EXTERNAL))
#if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
int __libcpp_recursive_mutex_init(__libcpp_recursive_mutex_t *__m)
{
pthread_mutexattr_t __attr;
int __ec = pthread_mutexattr_init(&__attr);
if (__ec)
return __ec;
__ec = pthread_mutexattr_settype(&__attr, PTHREAD_MUTEX_RECURSIVE);
if (__ec) {
pthread_mutexattr_destroy(&__attr);
return __ec;
}
__ec = pthread_mutex_init(__m, &__attr);
if (__ec) {
pthread_mutexattr_destroy(&__attr);
return __ec;
}
__ec = pthread_mutexattr_destroy(&__attr);
if (__ec) {
pthread_mutex_destroy(__m);
return __ec;
}
return 0;
}
int __libcpp_recursive_mutex_lock(__libcpp_recursive_mutex_t *__m)
{
return pthread_mutex_lock(__m);
}
bool __libcpp_recursive_mutex_trylock(__libcpp_recursive_mutex_t *__m)
{
return pthread_mutex_trylock(__m) == 0;
}
int __libcpp_recursive_mutex_unlock(__libcpp_recursive_mutex_t *__m)
{
return pthread_mutex_unlock(__m);
}
int __libcpp_recursive_mutex_destroy(__libcpp_recursive_mutex_t *__m)
{
return pthread_mutex_destroy(__m);
}
int __libcpp_mutex_lock(__libcpp_mutex_t *__m)
{
return pthread_mutex_lock(__m);
}
bool __libcpp_mutex_trylock(__libcpp_mutex_t *__m)
{
return pthread_mutex_trylock(__m) == 0;
}
int __libcpp_mutex_unlock(__libcpp_mutex_t *__m)
{
return pthread_mutex_unlock(__m);
}
int __libcpp_mutex_destroy(__libcpp_mutex_t *__m)
{
return pthread_mutex_destroy(__m);
}
// Condition Variable
int __libcpp_condvar_signal(__libcpp_condvar_t *__cv)
{
return pthread_cond_signal(__cv);
}
int __libcpp_condvar_broadcast(__libcpp_condvar_t *__cv)
{
return pthread_cond_broadcast(__cv);
}
int __libcpp_condvar_wait(__libcpp_condvar_t *__cv, __libcpp_mutex_t *__m)
{
return pthread_cond_wait(__cv, __m);
}
int __libcpp_condvar_timedwait(__libcpp_condvar_t *__cv, __libcpp_mutex_t *__m,
__libcpp_timespec_t *__ts)
{
return pthread_cond_timedwait(__cv, __m, __ts);
}
int __libcpp_condvar_destroy(__libcpp_condvar_t *__cv)
{
return pthread_cond_destroy(__cv);
}
// Execute once
int __libcpp_execute_once(__libcpp_exec_once_flag *__flag,
void (*__init_routine)()) {
return pthread_once(__flag, __init_routine);
}
// Thread id
// Returns non-zero if the thread ids are equal, otherwise 0
bool __libcpp_thread_id_equal(__libcpp_thread_id __t1, __libcpp_thread_id __t2)
{
return __t1 == __t2;
}
// Returns non-zero if t1 < t2, otherwise 0
bool __libcpp_thread_id_less(__libcpp_thread_id __t1, __libcpp_thread_id __t2)
{
return __t1 < __t2;
}
// Thread
bool __libcpp_thread_isnull(const __libcpp_thread_t *__t) {
return __libcpp_thread_get_id(__t) == 0;
}
int __libcpp_thread_create(__libcpp_thread_t *__t, void *(*__func)(void *),
void *__arg)
{
return pthread_create(__t, nullptr, __func, __arg);
}
__libcpp_thread_id __libcpp_thread_get_current_id()
{
const __libcpp_thread_t __current_thread = pthread_self();
return __libcpp_thread_get_id(&__current_thread);
}
__libcpp_thread_id __libcpp_thread_get_id(const __libcpp_thread_t *__t)
{
#if defined(__MVS__)
return __t->__;
#else
return *__t;
#endif
}
int __libcpp_thread_join(__libcpp_thread_t *__t)
{
return pthread_join(*__t, nullptr);
}
int __libcpp_thread_detach(__libcpp_thread_t *__t)
{
return pthread_detach(*__t);
}
void __libcpp_thread_yield()
{
sched_yield();
}
void __libcpp_thread_sleep_for(const chrono::nanoseconds& __ns)
{
__libcpp_timespec_t __ts = _VSTD::__convert_to_timespec<__libcpp_timespec_t>(__ns);
while (nanosleep(&__ts, &__ts) == -1 && errno == EINTR);
}
// Thread local storage
int __libcpp_tls_create(__libcpp_tls_key *__key, void (*__at_exit)(void *))
{
return pthread_key_create(__key, __at_exit);
}
void *__libcpp_tls_get(__libcpp_tls_key __key)
{
return pthread_getspecific(__key);
}
int __libcpp_tls_set(__libcpp_tls_key __key, void *__p)
{
return pthread_setspecific(__key, __p);
}
#elif defined(_LIBCPP_HAS_THREAD_API_C11)
int __libcpp_recursive_mutex_init(__libcpp_recursive_mutex_t *__m)
{
return mtx_init(__m, mtx_plain | mtx_recursive) == thrd_success ? 0 : EINVAL;
}
int __libcpp_recursive_mutex_lock(__libcpp_recursive_mutex_t *__m)
{
return mtx_lock(__m) == thrd_success ? 0 : EINVAL;
}
bool __libcpp_recursive_mutex_trylock(__libcpp_recursive_mutex_t *__m)
{
return mtx_trylock(__m) == thrd_success;
}
int __libcpp_recursive_mutex_unlock(__libcpp_recursive_mutex_t *__m)
{
return mtx_unlock(__m) == thrd_success ? 0 : EINVAL;
}
int __libcpp_recursive_mutex_destroy(__libcpp_recursive_mutex_t *__m)
{
mtx_destroy(__m);
return 0;
}
int __libcpp_mutex_lock(__libcpp_mutex_t *__m)
{
return mtx_lock(__m) == thrd_success ? 0 : EINVAL;
}
bool __libcpp_mutex_trylock(__libcpp_mutex_t *__m)
{
return mtx_trylock(__m) == thrd_success;
}
int __libcpp_mutex_unlock(__libcpp_mutex_t *__m)
{
return mtx_unlock(__m) == thrd_success ? 0 : EINVAL;
}
int __libcpp_mutex_destroy(__libcpp_mutex_t *__m)
{
mtx_destroy(__m);
return 0;
}
// Condition Variable
int __libcpp_condvar_signal(__libcpp_condvar_t *__cv)
{
return cnd_signal(__cv) == thrd_success ? 0 : EINVAL;
}
int __libcpp_condvar_broadcast(__libcpp_condvar_t *__cv)
{
return cnd_broadcast(__cv) == thrd_success ? 0 : EINVAL;
}
int __libcpp_condvar_wait(__libcpp_condvar_t *__cv, __libcpp_mutex_t *__m)
{
return cnd_wait(__cv, __m) == thrd_success ? 0 : EINVAL;
}
int __libcpp_condvar_timedwait(__libcpp_condvar_t *__cv, __libcpp_mutex_t *__m,
timespec *__ts)
{
int __ec = cnd_timedwait(__cv, __m, __ts);
return __ec == thrd_timedout ? ETIMEDOUT : __ec;
}
int __libcpp_condvar_destroy(__libcpp_condvar_t *__cv)
{
cnd_destroy(__cv);
return 0;
}
// Execute once
int __libcpp_execute_once(__libcpp_exec_once_flag *flag,
void (*init_routine)(void)) {
::call_once(flag, init_routine);
return 0;
}
// Thread id
// Returns non-zero if the thread ids are equal, otherwise 0
bool __libcpp_thread_id_equal(__libcpp_thread_id t1, __libcpp_thread_id t2)
{
return thrd_equal(t1, t2) != 0;
}
// Returns non-zero if t1 < t2, otherwise 0
bool __libcpp_thread_id_less(__libcpp_thread_id t1, __libcpp_thread_id t2)
{
return t1 < t2;
}
// Thread
bool __libcpp_thread_isnull(const __libcpp_thread_t *__t) {
return __libcpp_thread_get_id(__t) == 0;
}
int __libcpp_thread_create(__libcpp_thread_t *__t, void *(*__func)(void *),
void *__arg)
{
int __ec = thrd_create(__t, reinterpret_cast<thrd_start_t>(__func), __arg);
return __ec == thrd_nomem ? ENOMEM : __ec;
}
__libcpp_thread_id __libcpp_thread_get_current_id()
{
return thrd_current();
}
__libcpp_thread_id __libcpp_thread_get_id(const __libcpp_thread_t *__t)
{
return *__t;
}
int __libcpp_thread_join(__libcpp_thread_t *__t)
{
return thrd_join(*__t, nullptr) == thrd_success ? 0 : EINVAL;
}
int __libcpp_thread_detach(__libcpp_thread_t *__t)
{
return thrd_detach(*__t) == thrd_success ? 0 : EINVAL;
}
void __libcpp_thread_yield()
{
thrd_yield();
}
void __libcpp_thread_sleep_for(const chrono::nanoseconds& __ns)
{
__libcpp_timespec_t __ts = _VSTD::__convert_to_timespec<__libcpp_timespec_t>(__ns);
thrd_sleep(&__ts, nullptr);
}
// Thread local storage
int __libcpp_tls_create(__libcpp_tls_key *__key, void (*__at_exit)(void *))
{
return tss_create(__key, __at_exit) == thrd_success ? 0 : EINVAL;
}
void *__libcpp_tls_get(__libcpp_tls_key __key)
{
return tss_get(__key);
}
int __libcpp_tls_set(__libcpp_tls_key __key, void *__p)
{
return tss_set(__key, __p) == thrd_success ? 0 : EINVAL;
}
#endif
#endif // !_LIBCPP_HAS_THREAD_LIBRARY_EXTERNAL || _LIBCPP_BUILDING_THREAD_LIBRARY_EXTERNAL
class _LIBCPP_TYPE_VIS thread;
class _LIBCPP_TYPE_VIS __thread_id;
namespace this_thread
{
_LIBCPP_INLINE_VISIBILITY __thread_id get_id() _NOEXCEPT;
} // namespace this_thread
template<> struct hash<__thread_id>;
class _LIBCPP_TEMPLATE_VIS __thread_id
{
// FIXME: pthread_t is a pointer on Darwin but a long on Linux.
// NULL is the no-thread value on Darwin. Someone needs to check
// on other platforms. We assume 0 works everywhere for now.
__libcpp_thread_id __id_;
static _LIBCPP_HIDE_FROM_ABI
bool __lt_impl(__thread_id __x, __thread_id __y) _NOEXCEPT
{ // id==0 is always less than any other thread_id
if (__x.__id_ == 0) return __y.__id_ != 0;
if (__y.__id_ == 0) return false;
return __libcpp_thread_id_less(__x.__id_, __y.__id_);
}
public:
_LIBCPP_INLINE_VISIBILITY
__thread_id() _NOEXCEPT : __id_(0) {}
_LIBCPP_INLINE_VISIBILITY
void __reset() { __id_ = 0; }
friend _LIBCPP_HIDE_FROM_ABI bool operator==(__thread_id __x, __thread_id __y) _NOEXCEPT;
#if _LIBCPP_STD_VER <= 17
friend _LIBCPP_HIDE_FROM_ABI bool operator<(__thread_id __x, __thread_id __y) _NOEXCEPT;
#else // _LIBCPP_STD_VER <= 17
friend _LIBCPP_HIDE_FROM_ABI strong_ordering operator<=>(__thread_id __x, __thread_id __y) noexcept;
#endif // _LIBCPP_STD_VER <= 17
template<class _CharT, class _Traits>
friend
_LIBCPP_INLINE_VISIBILITY
basic_ostream<_CharT, _Traits>&
operator<<(basic_ostream<_CharT, _Traits>& __os, __thread_id __id);
private:
_LIBCPP_INLINE_VISIBILITY
__thread_id(__libcpp_thread_id __id) : __id_(__id) {}
_LIBCPP_HIDE_FROM_ABI friend __libcpp_thread_id __get_underlying_id(const __thread_id __id) { return __id.__id_; }
friend __thread_id this_thread::get_id() _NOEXCEPT;
friend class _LIBCPP_TYPE_VIS thread;
friend struct _LIBCPP_TEMPLATE_VIS hash<__thread_id>;
};
inline _LIBCPP_HIDE_FROM_ABI
bool operator==(__thread_id __x, __thread_id __y) _NOEXCEPT {
// Don't pass id==0 to underlying routines
if (__x.__id_ == 0)
return __y.__id_ == 0;
if (__y.__id_ == 0)
return false;
return __libcpp_thread_id_equal(__x.__id_, __y.__id_);
}
#if _LIBCPP_STD_VER <= 17
inline _LIBCPP_HIDE_FROM_ABI
bool operator!=(__thread_id __x, __thread_id __y) _NOEXCEPT {
return !(__x == __y);
}
inline _LIBCPP_HIDE_FROM_ABI
bool operator<(__thread_id __x, __thread_id __y) _NOEXCEPT {
return __thread_id::__lt_impl(__x.__id_, __y.__id_);
}
inline _LIBCPP_HIDE_FROM_ABI bool operator<=(__thread_id __x, __thread_id __y) _NOEXCEPT { return !(__y < __x); }
inline _LIBCPP_HIDE_FROM_ABI bool operator>(__thread_id __x, __thread_id __y) _NOEXCEPT { return __y < __x; }
inline _LIBCPP_HIDE_FROM_ABI bool operator>=(__thread_id __x, __thread_id __y) _NOEXCEPT { return !(__x < __y); }
#else // _LIBCPP_STD_VER <= 17
inline _LIBCPP_HIDE_FROM_ABI
strong_ordering operator<=>(__thread_id __x, __thread_id __y) noexcept {
if (__x == __y)
return strong_ordering::equal;
if (__thread_id::__lt_impl(__x, __y))
return strong_ordering::less;
return strong_ordering::greater;
}
#endif // _LIBCPP_STD_VER <= 17
namespace this_thread
{
inline _LIBCPP_INLINE_VISIBILITY
__thread_id
get_id() _NOEXCEPT
{
return __libcpp_thread_get_current_id();
}
} // namespace this_thread
#endif // !_LIBCPP_HAS_NO_THREADS
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___THREADING_SUPPORT