_Bool atomic_is_lock_free( const volatile A* obj );
(since C11)Determines if the atomic operations on all objects of the type A (the type of the object pointed to by obj) are lock-free. In any given program execution, the result of calling atomic_is_lock_free is the same for all pointers of the same type.
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.
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_is_lock_free)(...)), or a program defines an external identifier with the name of a generic function, the behavior is undefined.
[edit] Parameters obj - pointer to the atomic object to inspect [edit] Return valuetrue if the operations on all objects of the type A are lock-free, false otherwise.
#include <stdio.h>
#include <stdatomic.h>
_Atomic struct A { int a[100]; } a;
_Atomic struct B { int x, y; } b;
int main(void)
{
printf("_Atomic struct A is lock free? %s\n",
atomic_is_lock_free(&a) ? "true" : "false");
printf("_Atomic struct B is lock free? %s\n",
atomic_is_lock_free(&b) ? "true" : "false");
}
Possible output:
_Atomic struct A is lock free? false _Atomic struct B is lock free? true[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C standards.
DR Applied to Behavior as published Correct behavior DR 465 C11 this function was per-object this functions is per-type [edit] ReferencesRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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