ATOMIC_*_LOCK_FREE

 

C

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headers

Type support

Dynamic memory management

Error handling

Program utilities

Variadic function support

Date and time utilities

Strings library

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Numerics

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Thread support (C11)

Atomic operations (C11)

Technical Specifications

 

Atomic operations library

Types

memory_order

atomic_flag

Macros

ATOMIC_***_LOCK_FREE

ATOMIC_FLAG_INIT

ATOMIC_VAR_INIT

kill_dependency

Functions

atomic_flag_test_and_set

atomic_flag_clear

atomic_init

atomic_is_lock_free

atomic_store

atomic_load

atomic_exchange

atomic_compare_exchange

atomic_fetch_add

atomic_fetch_sub

atomic_fetch_or

atomic_fetch_xor

atomic_fetch_and

atomic_thread_fence

atomic_signal_fence

 

Defined in header <stdatomic.h>
#define ATOMIC_BOOL_LOCK_FREE     /* implementation-defined */ #define ATOMIC_CHAR_LOCK_FREE     /* implementation-defined */ #define ATOMIC_CHAR16_T_LOCK_FREE /* implementation-defined */ #define ATOMIC_CHAR32_T_LOCK_FREE /* implementation-defined */ #define ATOMIC_WCHAR_T_LOCK_FREE  /* implementation-defined */ #define ATOMIC_SHORT_LOCK_FREE    /* implementation-defined */ #define ATOMIC_INT_LOCK_FREE      /* implementation-defined */ #define ATOMIC_LONG_LOCK_FREE     /* implementation-defined */ #define ATOMIC_LLONG_LOCK_FREE    /* implementation-defined */ #define ATOMIC_POINTER_LOCK_FREE  /* implementation-defined */		(since C11)

Expands to preprocessor constant expressions that evaluate to either 0, 1, or 2 which indicate the lock-free property of the corresponding atomic types (both signed and unsigned).

Value	Explanation
0	The atomic type is never lock-free
1	The atomic type is sometimes lock-free
2	The atomic type is always lock-free

References

• C11 standard (ISO/IEC 9899:2011):

• 7.17.1/3 atomic lock-free macros (p: 273)