std:: atomic_flag_notify_one

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Concurrency support library
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atomic_flag_notify_one
(C++20)
Defined in header <atomic>
void atomic_flag_notify_one ( std:: atomic_flag * object ) noexcept ;
(1) (since C++20)
void atomic_flag_notify_one ( volatile std:: atomic_flag * object ) noexcept ;
(2) (since C++20)

Performs atomic notifying operations.

If there is a thread blocked in an atomic waiting operation (i.e. std::atomic_flag_wait() , std::atomic_flag_wait_explicit() , or std::atomic_flag::wait() ) on * object , then unblocks at least one such thread; otherwise does nothing.

Equivalent to object - > notify_one ( ) .

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 )
notifies all threads blocked in atomic_flag_wait
(function)