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std::atomic_flag_notify_all

Defined in header <atomic>
(since C++20)
void atomic_flag_notify_all( std::atomic_flag* object ) noexcept;
void atomic_flag_notify_all( volatile std::atomic_flag* object ) noexcept;

Performs atomic notifying operations.

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

Equivalent to object->notify_all().

Parameters

object - pointer to the atomic_flag object to notify

Return value

(none).

Notes

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

Example

See also

(C++20)
notifies at least one thread waiting on the atomic object
(public member function of std::atomic_flag)
(C++20)
notifies all threads blocked waiting on the atomic object
(public member function of std::atomic_flag)
(C++20)(C++20)
blocks the thread until notified and the flag changes
(function)
(C++20)
notifies a thread blocked in atomic_flag_wait
(function)

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