std::atomic_flag::test_and_set

 

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)

 

std::atomic_flag

Member functions

atomic_flag::atomic_flag

atomic_flag::operator=

atomic_flag::clear

atomic_flag::test_and_set

 

Defined in header <atomic>
bool test_and_set(std::memory_order order = std::memory_order_seq_cst) volatile;	(1)	(since C++11)
bool test_and_set(std::memory_order order = std::memory_order_seq_cst);	(2)	(since C++11)

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

Parameters

order

-

the memory sycnhronization ordering for this operation

Exceptions

noexcept specification:  

noexcept

  (since C++11)

See also

clear	atomically sets flag to false (public member function)
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)