NAME¶

std::atomic_flag_clear,std::atomic_flag_clear_explicit - std::atomic_flag_clear,std::atomic_flag_clear_explicit

Synopsis¶

Defined in header <atomic>
void atomic_flag_clear( volatile
std::atomic_flag* p ) noexcept;
void atomic_flag_clear( std::atomic_flag* p )
noexcept;
void atomic_flag_clear_explicit( volatile (1) (since C++11)
std::atomic_flag* p,
std::memory_order order ) noexcept; (2) (since C++11)
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
the memory synchronization ordering for this operation: only
order - 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¶

atomic_flag the lock-free boolean atomic type
(C++11) (class)
atomic_flag_test_and_set atomically sets the flag to true and returns its
atomic_flag_test_and_set_explicit previous value
(C++11) (function)
(C++11)
memory_order defines memory ordering constraints for the given
(C++11) atomic operation
(enum)