In Go language, atomic packages supply lower-level atomic memory that is helpful is implementing synchronization algorithms. The CompareAndSwapInt64() function in Go language is used to perform the compare and swap operation for an int64 value. This function is defined under the atomic package. Here, you need to import “sync/atomic” package in order to use these functions.
func CompareAndSwapInt64(addr *int64, old, new int64) (swapped bool)
Here, addr indicates address, old indicates int64 value that is the old swapped value which is returned from the swapped operation, and new is the int64 new value that will swap itself from the old swapped value.
Note: (*int64) is the pointer to a int64 value. And int64 is integer type of bit size 64. Moreover, int64 contains the set of all signed 64-bit integers from -9223372036854775808 to 9223372036854775807.
Return Value: It returns true if swapping is accomplished else it returns false.
Below examples illustrates the use of the above method:
Swapped: 56677 , old value: 686788787 true The Value of i is: 908998
Swapped: 56677, old value: 686788787 false 56677
Here, the old value in the CompareAndSwapInt64 method must be the swapped value returned from the SwapInt64 method. And here the swapping is not performed so false is returned.