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std::atomic_flag_clear, std::atomic_flag_clear_explicit

Defined in header <atomic>
(1) (since C++11) 
void atomic_flag_clear( volatile std::atomic_flag* p ) noexcept;
 
void atomic_flag_clear( std::atomic_flag* p ) noexcept;
(2) (since C++11) 
void atomic_flag_clear_explicit( volatile std::atomic_flag* p, 
                                 std::memory_order order ) noexcept;
 
void atomic_flag_clear_explicit( std::atomic_flag* p, 
                                 std::memory_order order ) noexcept;

Atomically changes the state of a std::atomic_flag pointed to by p to clear (false).

Parameters

p - pointer to std::atomic_flag to access
order - the memory synchronization ordering for this operation: only std::memory_order_relaxed, std::memory_order_release, or std::memory_order_seq_cst are permitted.

Return value

none.

Possible implementation

First version 
void atomic_flag_clear(volatile std::atomic_flag* p) 
{
    p->clear();
}
Second version 
void atomic_flag_clear(std::atomic_flag* p) 
{
    p->clear();
}
Third version 
void atomic_flag_clear_explicit(volatile std::atomic_flag* p, 
                                std::memory_order order) 
{
    p->clear(order);
}
Fourth version 
void atomic_flag_clear_explicit(std::atomic_flag* p, 
                                std::memory_order order) 
{
    p->clear(order);
}

See also

(C++11)
 the lock-free boolean atomic type
(class)
(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)
C documentation for atomic_flag_clear, atomic_flag_clear_explicit

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