std::atomic_flag_clear, std::atomic_flag_clear_explicit

 

C++

Language

Standard library headers

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

 

Atomic operations library

Types

atomic (C++11)

atomic_is_lock_free (C++11)

Functions

atomic_store atomic_store_explicit (C++11) (C++11)

atomic_load atomic_load_explicit (C++11) (C++11)

atomic_exchange atomic_exchange_explicit (C++11) (C++11)

atomic_compare_exchange_weak atomic_compare_exchange_weak_explicit atomic_compare_exchange_strong atomic_compare_exchange_strong_explicit (C++11) (C++11) (C++11) (C++11)

atomic_fetch_add atomic_fetch_add_explicit (C++11) (C++11)

atomic_fetch_sub atomic_fetch_sub_explicit (C++11) (C++11)

atomic_fetch_and atomic_fetch_and_explicit (C++11) (C++11)

atomic_fetch_or atomic_fetch_or_explicit (C++11) (C++11)

atomic_fetch_xor atomic_fetch_xor_explicit (C++11) (C++11)

Atomic flags

atomic_flag (C++11)

atomic_flag_test_and_set atomic_flag_test_and_set_explicit (C++11) (C++11)

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

Initialization

atomic_init (C++11)

ATOMIC_VAR_INIT (C++11)

ATOMIC_FLAG_INIT (C++11)

Memory ordering

memory_order (C++11)

kill_dependency (C++11)

atomic_thread_fence (C++11)

atomic_signal_fence (C++11)

 

Defined in header <atomic>
void atomic_flag_clear( volatile std::atomic_flag* p );	(1)	(since C++11)
void atomic_flag_clear( std::atomic_flag* p );	(2)	(since C++11)
void atomic_flag_clear_explicit( volatile std::atomic_flag* p,                                  std::memory_order order )	(3)	(since C++11)
void atomic_flag_clear_explicit( std::atomic_flag* p,                                  std::memory_order order )	(4)	(since C++11)

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 sycnhronization ordering for this operation: only std::memory_order_relaxed, std::memory_order_consume, std::memory_order_acquire, or std::memory_order_seq_cst are permitted.

Return value

none.

Exceptions

noexcept specification:  

noexcept

  (since C++11)

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