Namespaces
Variants
Views
Actions

std::atomic_flag::notify_one

From cppreference.com
< cpp‎ | atomic‎ | atomic flag
 
 
Concurrency support library
Threads
(C++11)
(C++20)
(C++20)
this_thread namespace
(C++11)
(C++11)
(C++11)
Atomic types
(C++11)
(C++20)
Initialization of atomic types
(C++11)(deprecated in C++20)
(C++11)(deprecated in C++20)
Free functions for atomic operations
Free functions for atomic flags
Memory ordering
Mutual exclusion
(C++11)
Generic lock management
(C++11)
(C++11)
(C++11)
(C++11)(C++11)(C++11)
(C++11)
(C++11)
Condition variables
(C++11)
Semaphores
Latches and barriers
(C++20)
(C++20)
Futures
(C++11)
(C++11)
(C++11)
(C++11)
 
 
(since C++20)
void notify_one() noexcept;
void notify_one() volatile noexcept;

Performs atomic notifying operations.

If there is a thread blocked in atomic waiting operation (i.e. wait()) on *this, then unblocks at least one such thread; otherwise does nothing.

Contents

[edit] Return value

(none)

[edit] Notes

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

[edit] Example

[edit] See also

(C++20)
blocks the thread until notified and the atomic value changes
(public member function) [edit]
blocks the thread until notified and the flag changes
(function) [edit]
notifies a thread blocked in atomic_flag_wait
(function) [edit]