std::atomic_flag_test_and_set

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Defined in header `<atomic>`

bool atomic_flag_test_and_set( volatile std::atomic_flag* p );	(1)	(C++11 feature)

bool atomic_flag_test_and_set( std::atomic_flag* p );	(2)	(C++11 feature)

bool atomic_flag_test_and_set_explicit( volatile std::atomic_flag* p, std::memory_order order );	(3)	(C++11 feature)

bool atomic_flag_test_and_set_explicit( std::atomic_flag* p, std::memory_order order );	(4)	(C++11 feature)

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

First version
bool atomic_flag_test_and_set( volatile std::atomic_flag* p ) { return p->test_and_set(); }
Second version
bool atomic_flag_test_and_set( std::atomic_flag* p ) { return p->test_and_set(); }
Third version
bool atomic_flag_test_and_set_explicit( volatile std::atomic_flag* p, std::memory_order order ) { return p->test_and_set(order); }
Fourth version
bool atomic_flag_test_and_set_explicit( std::atomic_flag* p, std::memory_order order ) { return p->test_and_set(order); }

atomic_flag (C++11)

the lock-free boolean atomic type
(class)

atomic_flag_clear atomic_flag_clear_explicit (C++11)
(C++11)

atomically sets the value of the flag to false
(function)

memory_order (C++11)

defines memory ordering constraints for the given atomic operation
(typedef)

`p`	-	pointer to std::atomic_flag to access
`order`	-	the memory sycnhronization ordering for this operation

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