What is Atomics?
- Atomics are used with SharedArrayBuffer(generic fixed-length binary data buffer) objects.
- Atomics are not constructors like other global objects.
- Atomics cannot be used with a new operator or can be invoked as a function.
Multiple threads can read and write the same data in memory when there shared memory is. To ensure that predicted values are written and read accurately, another operation cannot start until and unless the current one finishes. Atomic operations also cannot be interrupted.
- Atomics.and() operation returns the old value at that position.
- The integer typedarray, index, and the value are passed as an argument to the function and it returns the value that has been stored in the respective array.
Atomics.and(typedArray, index, value)
Parameters Used: This method accepts three parameters which are described below:
- typedarray: This parameter specifies a shared integer typed array Int8Array, Uint8Array, Int16Array etc.
- index: This parameter specifies the position in the array, typedArray to compute bitwise AND.
- value: This parameter specifies the number to compute bitwise AND with.
Return value: The Atomics.and() method returns the old value at the given position(typedArray[index]).
Input : arr = 5 Atomics.and(arr, 0, 3) Output : 1 Input : arr = 4 Atomics.and(arr, 0, 6) Output : 4
Below programs illustrate the Atomics.and() method:
5 1 1
7 2 2
- If the typedArray is not one of the allowed integer types then the Atomics.and( ) operation throws a TypeError.
- If the typedArray is not a shared typed array then the Atomics.and( ) operation throws a TypeError.
- If the index used as an argument to the Atomics.and( ) operation is out of the bound in the typedArray then the Atomics.store( ) operation throws a RangeError.