void atomic_init( volatile A* obj, C desired );
(since C11)Initializes the default-constructed atomic object obj with the value desired. The function is not atomic: concurrent access from another thread, even through an atomic operation, is a data race.
This is a generic function defined for all atomic object types A. The argument is pointer to a volatile atomic type to accept addresses of both non-volatile and volatile (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 to A.
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.
[edit] Parameters obj - pointer to an atomic object to initialize desired - the value to initialize atomic object with [edit] Return value(none)
[edit] Notesatomic_init is the only way to initialize dynamically-allocated atomic objects. For example:
_Atomic int *p = malloc(sizeof(_Atomic int)); atomic_init(p, 42);[edit] References
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