Atomics - isLockFree() Method

isLockFree method is used to determine whether locks are to be used or not for atomic operations. If given size is one of TypedArray.BYTES_PER_ELEMENT property of integer TypedArray types then it returns true. TypedArray.BYTES_PER_ELEMENT represents the size in bytes of each element of an typed array.

Syntax

Atomics.isLockFree(size)

Parameters

size to be checked in bytes.

Return

Returns true if operation is lock free as false.

Example

Following is the code for implementing JavaScript Atomics −

Live Demo

<!DOCTYPE html>
<html lang="en">
   <head>
      <meta charset="UTF-8" />
      <meta name="viewport" content="width=device-width, initial-scale=1.0" />
      <title>Atomics Example</title>
      <style>
         .result {
            font-size: 20px;
            border: 1px solid black;
         }
      </style>
   </head>
   <body onLoad="operate();">
      <h1>JavaScript Atomics Properties</h1>
      <div class="result"></div>
      <p>Atomics.isLockFree(1)</p>
      <p>Atomics.isLockFree(3)</p>
      <script>
         function operate(){
            let container = document.querySelector(".result");
            // create a SharedArrayBuffer
            var buffer = new SharedArrayBuffer(25);
            var arr = new Uint8Array(buffer);
            // Initialise element at zeroth position of array with 6
            arr[0] = 6;
            // Int8Array.BYTES_PER_ELEMENT = 1
            container.innerHTML = Atomics.isLockFree(Int8Array.BYTES_PER_ELEMENT) + '<br/>' + Atomics.isLockFree(3);
         }
      </script>
   </body>
</html>

Output

Verify the result.