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std::atomic_notify_all(3)     C++ Standard Libary    std::atomic_notify_all(3)

NAME
       std::atomic_notify_all -	std::atomic_notify_all

Synopsis
	  Defined in header <atomic>
	  template< class T >
	  void	atomic_notify_all(  std::atomic<T>* object );		(since
       C++20)
	  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		notifies  at  least  one thread	waiting	on the
       atomic object
	  (C++20)	       (public member function of std::atomic<T>)
	  notify_all	       notifies	all threads  blocked  waiting  on  the
       atomic object
	  (C++20)	       (public member function of std::atomic<T>)
	  atomic_wait
	  atomic_wait_explicit blocks the thread until notified	and the	atomic
       value changes
	  (C++20)	       (function template)
	  (C++20)
	  atomic_notify_one    notifies	a thread blocked in atomic_wait
	  (C++20)	       (function template)

http://cppreference.com		  2022.07.31	     std::atomic_notify_all(3)

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