The atomic library provides components for fine-grained atomic operations allowing for lockless concurrent programming. Each atomic operation is indivisible with regards to any other atomic operation that involves the same object. Atomic objects are the only C++ objects free of data races; that is, if one thread writes to an atomic while another thread reads from it, the behavior is well-defined.
| Defined in header <atomic> | |
|---|---|
Atomic types | |
| (C++11) | atomic class template and specializations for bool, integral, and pointer types (class template) |
Operations on atomic types | |
| (C++11) | checks if the atomic type's operations are lock-free (function template) |
| (C++11)(C++11) | atomically replaces the value of the atomic object with a non-atomic argument (function template) |
| (C++11)(C++11) | atomically obtains the value stored in an atomic object (function template) |
| (C++11)(C++11) | atomically replaces the value of the atomic object with non-atomic argument and returns the old value of the atomic (function template) |
| atomically compares the value of the atomic object with non-atomic argument and performs atomic exchange if equal or atomic load if not (function template) | |
| (C++11)(C++11) | adds a non-atomic value to an atomic object and obtains the previous value of the atomic (function template) |
| (C++11)(C++11) | subtracts a non-atomic value from an atomic object and obtains the previous value of the atomic (function template) |
| (C++11)(C++11) | replaces the atomic object with the result of logical AND with a non-atomic argument and obtains the previous value of the atomic (function template) |
| (C++11)(C++11) | replaces the atomic object with the result of logical OR with a non-atomic argument and obtains the previous value of the atomic (function template) |
| (C++11)(C++11) | replaces the atomic object with the result of logical XOR with a non-atomic argument and obtains the previous value of the atomic (function template) |
Flag type and operations | |
| (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)(C++11) | atomically sets the value of the flag to false (function) |
Initialization | |
| (C++11) | non-atomic initialization of a default-constructed atomic object (function template) |
| (C++11) | constant initialization of an atomic variable of static storage duration (function macro) |
| (C++11) | initializes an std::atomic_flag to false (macro constant) |
Memory synchronization ordering | |
| (C++11) | defines memory ordering constraints for the given atomic operation (typedef) |
| (C++11) | removes the specified object from the std::memory_order_consume dependency tree (function template) |
| (C++11) | generic memory order-dependent fence synchronization primitive (function) |
| (C++11) | fence between a thread and a signal handler executed in the same thread (function) |
See also
C documentation for Atomic operations library |
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