Introduction
These are types that encapsulate a value whose access is guaranteed to not cause data races and can be used to synchronize memory accesses among different threads and he 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 type
S.N. | Member types | Definition |
---|---|---|
1 | atomic | Atomic class template and specializations for bool, integral, and pointer types |
C-style atomic types
The following are atomic types and also defined in this header.contained type | atomic type | description |
---|---|---|
bool |
atomic_bool | |
char |
atomic_char | atomics for fundamental integral types. These are either typedefs of the corresponding full specialization of the atomic class template or a base class of such specialization. |
signed char |
atomic_schar | |
unsigned char |
atomic_uchar | |
short |
atomic_short | |
unsigned short |
atomic_ushort | |
int |
atomic_int | |
unsigned int |
atomic_uint | |
long |
atomic_long | |
unsigned long |
atomic_ulong | |
long long |
atomic_llong | |
unsigned long long |
atomic_ullong | |
wchar_t |
atomic_wchar_t | |
char16_t |
atomic_char16_t | |
char32_t |
atomic_char32_t | |
intmax_t | atomic_intmax_t | atomics for width-based integrals (those defined in <cinttypes>). Each of these is either an alias of one of the above atomics for fundamental integral types or of a full specialization of the atomic class template with an extended integral type. Where N is one in 8, 16, 32, 64, or any other type width supported by the library. |
uintmax_t | atomic_uintmax_t | |
int_least N_t |
atomic_int_least N_t |
|
uint_least N_t |
atomic_uint_least N_t |
|
int_fast N_t |
atomic_int_fast N_t |
|
uint_fast N_t |
atomic_uint_fast N_t |
|
intptr_t | atomic_intptr_t | |
uintptr_t | atomic_uintptr_t | |
size_t | atomic_size_t | |
ptrdiff_t | atomic_ptrdiff_t |
Operations on atomic types
S.N. | Operations | Definition |
---|---|---|
1 | atomic_is_lock_free | It is used to checks if the atomic type's operations are lock-free |
2 | atomic_store & atomic_store_explicit | It automically replaces the value of the atomic object with a non-atomic argument |
3 | atomic_load & atomic_load_explicit | It atomically obtains the value stored in an atomic object |
4 | atomic_exchange & atomic_exchange_explicit | It atomically replaces the value of the atomic object with non-atomic argument and returns the old value of the atomic |
5 | atomic_compare_exchange_weak & atomic_compare_exchange_weak_explicit & atomic_compare_exchange_strong & atomic_compare_exchange_strong_explicit | It atomically compares the value of the atomic object with non-atomic argument and performs atomic exchange if equal or atomic load if not |
6 | atomic_fetch_add & atomic_fetch_add_explicit | It adds a non-atomic value to an atomic object and obtains the previous value of the atomic |
7 | atomic_fetch_sub & atomic_fetch_sub_explicit | It subtracts a non-atomic value from an atomic object and obtains the previous value of the atomic |
8 | atomic_fetch_and & atomic_fetch_and_explicit | It replaces the atomic object with the result of logical AND with a non-atomic argument and obtains the previous value of the atomic |
9 | atomic_fetch_or & atomic_fetch_or_explicit | It replaces the atomic object with the result of logical OR with a non-atomic argument and obtains the previous value of the atomic |
10 | atomic_fetch_xor & atomic_fetch_xor_explicit | It replaces the atomic object with the result of logical XOR with a non-atomic argument and obtains the previous value of the atomic |
Flag type and operations
S.N. | Flag type | Definition |
---|---|---|
1 | atomic_flag | The lock-free boolean atomic type |
2 | atomic_flag_test_and_set & atomic_flag_test_and_set_explicit | It atomically sets the flag to true and returns its previous value |
3 | atomic_flag_clear & atomic_flag_clear_explicit | It atomically sets the value of the flag to false |
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