44 static void __libcpp_platform_wait_on_address(__cxx_atomic_contention_t const volatile* __ptr,  in __libcpp_platform_wait_on_address()  argument
48     syscall(SYS_futex, __ptr, FUTEX_WAIT_PRIVATE, __val, &__timeout, 0, 0);  in __libcpp_platform_wait_on_address()
51 static void __libcpp_platform_wake_by_address(__cxx_atomic_contention_t const volatile* __ptr,  in __libcpp_platform_wake_by_address()  argument
54     syscall(SYS_futex, __ptr, FUTEX_WAKE_PRIVATE, __notify_one ? 1 : INT_MAX, 0, 0, 0);  in __libcpp_platform_wake_by_address()
66 static void __libcpp_platform_wait_on_address(__cxx_atomic_contention_t const volatile* __ptr,
70                  const_cast<__cxx_atomic_contention_t*>(__ptr), __val, 0);
73 static void __libcpp_platform_wake_by_address(__cxx_atomic_contention_t const volatile* __ptr,
77                  const_cast<__cxx_atomic_contention_t*>(__ptr), 0);
82 static void __libcpp_platform_wait_on_address(__cxx_atomic_contention_t const volatile* __ptr,
85     _umtx_op(const_cast<__cxx_atomic_contention_t*>(__ptr),
89 static void __libcpp_platform_wake_by_address(__cxx_atomic_contention_t const volatile* __ptr,
92     _umtx_op(const_cast<__cxx_atomic_contention_t*>(__ptr),
100 static void __libcpp_platform_wait_on_address(__cxx_atomic_contention_t const volatile* __ptr,
104 …      return !__cxx_nonatomic_compare_equal(__cxx_atomic_load(__ptr, memory_order_relaxed), __val);