# std::atomic_notify_all

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< cpp‎ | atomic

Defined in header `<atomic>` |  |
|  | (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.

### Example

| This section is incomplete Reason: no example

### 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_wait atomic_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)

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