std::atomic_notify_all

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

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Filesystem library (C++17)

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Concurrency support library (C++11)

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Technical specifications

Symbols index

External libraries

 

Atomic operations library

Types

atomic (C++11)

atomic_ref (C++20)

Functions

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_is_lock_free (C++11)

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

atomic_notify_one (C++20)

atomic_notify_all (C++20)

Atomic flags

atomic_flag (C++11)

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)

Initialization

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

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

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

Memory ordering

memory_order (C++11)

kill_dependency (C++11)

atomic_thread_fence (C++11)

atomic_signal_fence (C++11)

 

Defined in header <atomic>
	(1)	(since C++20)
template< class T > void atomic_notify_all( std::atomic<T>* object );
template< class T > void atomic_notify_all( volatile std::atomic<T>* object );

Performs atomic notifying operations.

Unblocks all threads blocked in atomic waiting operations (i.e. std::atomic_wait, std::atomic_wait_explicit, or std::atomic::wait()) on *object, if there are any; otherwise does nothing.

Equivalent to object->notify_all().

Parameters

object

-

pointer to the atomic object to notify

Return value

(none)

Notes

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

See also

notify_one (C++20)	notifies at least one thread waiting on the atomic object (public member function of std::atomic<T>)
notify_all (C++20)	notifies all threads blocked waiting on the atomic object (public member function of std::atomic<T>)
atomic_waitatomic_wait_explicit (C++20)(C++20)	blocks the thread until notified and the atomic value changes (function template)
atomic_notify_one (C++20)	notifies a thread blocked in atomic_wait (function template)