std::atomic_flag_clear, std::atomic_flag_clear_explicit

< cpp‎ | atomic
 
C++
 
Atomic operations library
Types
(C++11)
(C++20)
Functions
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)
Atomic flags
(C++11)
(C++11)(C++11)
atomic_flag_clearatomic_flag_clear_explicit
(C++11)(C++11)
Initialization
(C++11)
(C++11)
(C++11)
Memory ordering
(C++11)
(C++11)
(C++11)
(C++11)
 
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)