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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../atomic/atomic_flag_test_and_set.html below:

std::atomic_flag_test_and_set, std::atomic_flag_test_and_set_explicit - cppreference.com

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

3,4) The memory synchronization order is order.

[edit] Parameters obj - pointer to std::atomic_flag to access order - the memory synchronization order [edit] Return value

The value previously held by the flag pointed to by obj.

[edit] Notes

std::atomic_flag_test_and_set and std::atomic_flag_test_and_set_explicit can be implemented as obj->test_and_set() and obj->test_and_set(order) respectively.

[edit] Example

A spinlock mutex can be implemented in userspace using an std::atomic_flag.

Output:

Output from thread 2
Output from thread 6
Output from thread 7
...<exactly 1000 lines>...
[edit] See also

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