cppreference.com

Namespaces

Variants

Actions

std::atomic_ref<T>::notify_one

From cppreference.com

< cpp‎ | atomic‎ | atomic ref

[edit template]

Compiler support

Freestanding and hosted

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Diagnostics library

Memory management library

Metaprogramming library (C++11)

General utilities library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library (C++17)

Concurrency support library (C++11)

Execution control library (C++26)

Technical specifications

External libraries

Concurrency support library

(C++11)

(C++20)

hardware_destructive_interference_sizehardware_constructive_interference_size

(C++17)(C++17)

this_thread namespace

(C++11)

(C++11)

(C++11)

(C++11)

Cooperative cancellation

(C++20)

inplace_stop_token

(C++26)

never_stop_token

(C++26)

(C++20)

inplace_stop_source

(C++26)

(C++20)

inplace_stop_callback

(C++26)

stop_callback_for_t

(C++26)

stoppable_token

(C++26)

unstoppable_token

(C++26)

stoppable-source

(C++26)

stoppable-callback-for

(C++26)

Mutual exclusion

(C++11)

recursive_mutex

(C++11)

(C++17)

(C++11)

recursive_timed_mutex

(C++11)

shared_timed_mutex

(C++14)

Generic lock management

(C++11)

(C++11)

(C++17)

(C++11)

(C++14)

(C++11)

(C++11)

(C++11)

defer_locktry_to_lockadopt_lockdefer_lock_ttry_to_lock_tadopt_lock_t

(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)

Condition variables

condition_variable

(C++11)

condition_variable_any

(C++11)

notify_all_at_thread_exit

(C++11)

(C++11)

counting_semaphorebinary_semaphore

(C++20)(C++20)

Latches and Barriers

(C++20)

(C++20)

(C++11)

(C++11)

(C++11)

(C++11)

(C++11)

(C++11)

(C++11)

(C++11)

future_category

(C++11)

(C++11)

Safe reclamation

(C++26)

(C++26)

rcu_default_domain

(C++26)

rcu_synchronize

(C++26)

(C++26)

(C++26)

Hazard pointers

hazard_pointer_obj_base

(C++26)

(C++26)

make_hazard_pointer

(C++26)

(C++11)

(C++20)

(C++11)

Initialization of atomic types

(C++11)(deprecated in C++20)

ATOMIC_VAR_INIT

(C++11)(deprecated in C++20)

ATOMIC_FLAG_INIT

(C++11)

Memory ordering

(C++11)

kill_dependency

(C++11)(deprecated in C++26)

atomic_thread_fence

(C++11)

atomic_signal_fence

(C++11)

Free functions for atomic operations

atomic_storeatomic_store_explicit

(C++11)(C++11)

atomic_loadatomic_load_explicit

(C++11)(C++11)

atomic_exchangeatomic_exchange_explicit

(C++11)(C++11)

atomic_compare_exchange_weakatomic_compare_exchange_weak_explicitatomic_compare_exchange_strongatomic_compare_exchange_strong_explicit

(C++11)(C++11)(C++11)(C++11)

atomic_fetch_addatomic_fetch_add_explicit

(C++11)(C++11)

atomic_fetch_subatomic_fetch_sub_explicit

(C++11)(C++11)

atomic_fetch_andatomic_fetch_and_explicit

(C++11)(C++11)

atomic_fetch_oratomic_fetch_or_explicit

(C++11)(C++11)

atomic_fetch_xoratomic_fetch_xor_explicit

(C++11)(C++11)

atomic_fetch_maxatomic_fetch_max_explicit

(C++26)(C++26)

atomic_fetch_minatomic_fetch_min_explicit

(C++26)(C++26)

atomic_is_lock_free

(C++11)

atomic_waitatomic_wait_explicit

(C++20)(C++20)

atomic_notify_one

(C++20)

atomic_notify_all

(C++20)

Free functions for atomic flags

atomic_flag_test_and_setatomic_flag_test_and_set_explicit

(C++11)(C++11)

atomic_flag_clearatomic_flag_clear_explicit

(C++11)(C++11)

atomic_flag_testatomic_flag_test_explicit

(C++20)(C++20)

atomic_flag_waitatomic_flag_wait_explicit

(C++20)(C++20)

atomic_flag_notify_one

(C++20)

atomic_flag_notify_all

(C++20)

std::atomic_ref

Member functions

atomic_ref::atomic_ref

atomic_ref::operator=

atomic_ref::is_lock_free

atomic_ref::store

atomic_ref::load

atomic_ref::operator value_type

atomic_ref::exchange

atomic_ref::compare_exchange_strongatomic_ref::compare_exchange_weak

atomic_ref::wait

atomic_ref::notify_one

atomic_ref::notify_all

atomic_ref::address

(C++26)

Operations for arithmetic types
(except bool and pointer-to-object)

atomic_ref::fetch_add

atomic_ref::fetch_sub

atomic_ref::operator+=atomic_ref::operator-=

Operations for integral types
(except bool and pointer-to-object)

atomic_ref::fetch_max

(C++26)

atomic_ref::fetch_min

(C++26)

atomic_ref::operator++atomic_ref::operator++(int)atomic_ref::operator--atomic_ref::operator--(int)

Operations for integral types
(except bool)

atomic_ref::fetch_and

atomic_ref::fetch_or

atomic_ref::fetch_xor

atomic_ref::operator&=atomic_ref::operator|=atomic_ref::operator^=

atomic_ref::is_always_lock_free

atomic_ref::required_alignment

void notify_one() const noexcept;

(constexpr since C++26)

Performs atomic notifying operations.

If there is a thread blocked in atomic waiting operation (i.e. wait()) on *ptr , then unblocks at least one such thread; otherwise does nothing. This overload participates in overload resolution only if std::is_const_v <T> is false.

Contents

[edit] Notes

This form of change-detection is often more efficient than simple polling or pure spinlocks.

[edit] Example

This section is incomplete
Reason: no example

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 3508 (P3323R1)	C++20	`notify_one` was meaningless for const T	constrained to accept only non-const `T`

[edit] See also

blocks the thread until notified and the atomic value changes
(public member function) [edit]

atomic_waitatomic_wait_explicit

(C++20)(C++20)

blocks the thread until notified and the atomic value changes
(function template) [edit]

atomic_notify_one

(C++20)

notifies a thread blocked in atomic_wait
(function template) [edit]

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/atomic/atomic_ref/notify_one&oldid=114502"

Todo no example