Atomics - isLockFree() Method


Advertisements

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 −

<!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.

Advertisements