std:: atomic_notify_all

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Concurrency support library
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(C++11)
(C++20)
this_thread namespace
(C++11)
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(C++11)
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(C++20)
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Initialization of atomic types
(C++11) (deprecated in C++20)
(C++11) (deprecated in C++20)
Memory ordering
Free functions for atomic operations
atomic_notify_all
(C++20)
Free functions for atomic flags
Defined in header <atomic>
template < class T >
void atomic_notify_all ( std:: atomic < T > * object ) ;
(1) (since C++20)
template < class T >
void atomic_notify_all ( volatile std:: atomic < T > * object ) ;
(2) (since C++20)

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

See also

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