|
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Defined in header <stdatomic.h> | ||
void atomic_init(volatile A* obj, C desired); | (since C11) | |
Initializes the default-constructed atomic objectobj with the valuedesired. The function is not atomic: concurrent access from another thread, even through an atomic operation, is a data race.
This is ageneric function defined for allatomic object typesA. The argument is pointer to a volatile atomic type to accept addresses of both non-volatile andvolatile (e.g. memory-mapped I/O) atomic objects, and volatile semantic is preserved when applying this operation to volatile atomic objects.C is the non-atomic type corresponding toA.
It is unspecified whether the name of a generic function is a macro or an identifier declared with external linkage. If a macro definition is suppressed in order to access an actual function (e.g. parenthesized like(atomic_init)(...)), or a program defines an external identifier with the name of a generic function, the behavior is undefined.
Contents |
| obj | - | pointer to an atomic object to initialize |
| desired | - | the value to initialize atomic object with |
(none)
atomic_init is the only way to initialize dynamically-allocated atomic objects. For example:
_Atomicint*p=malloc(sizeof(_Atomicint));atomic_init(p,42);
(C11)(deprecated in C17)(removed in C23) | initializes a new atomic object (function macro)[edit] |
C++ documentation foratomic_init | |
