std::atomic_flag:: test_and_set

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std::atomic_flag
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 order

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)
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