std::atomic_flag::test_and_set

Defined in header <atomic> 
bool test_and_set(std::memory_order order = std::memory_order_seq_cst) volatile noexcept;
 (1) (since C++11) 
bool test_and_set(std::memory_order order = std::memory_order_seq_cst) noexcept;
 (2) (since C++11)

Atomically changes the state of a std::atomic_flag to set (true) and returns the value it held before.

Parameters

order - the memory synchronization ordering for this operation

See also

atomically sets flag to false
(public member function)
(C++11)(C++11)
 atomically sets the flag to true and returns its previous value
(function)
(C++11)
 defines memory ordering constraints for the given atomic operation
(enum)

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/atomic/atomic_flag/test_and_set