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atomic_is_lock_free

Defined in header <stdatomic.h> 
_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.

-

Parameters

- -
obj - pointer to the atomic object to inspect

Return value

true if the operations on all objects of the type A are lock-free, false otherwise.

-

Example

#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

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

References

See also

- -
-
(C11)
 indicates that the given atomic type is lock-free
(macro constant)
C++ documentation for atomic_is_lock_free
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/atomic/atomic_is_lock_free -

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