Determining neutering status of transferable object in JavaScript Float32Array

Question

Determining neutering status of transferable object in JavaScript Float32Array

I am utilizing transferable objects in the communication between my main thread and physics worker. The Float32Array is being shared back and forth with great efficiency. How can I determine if a Float32Array has been neutered?

For instance, here is an example array:

this.transferableArray = new Float32Array();

Sent as a transferable object:

worker.postMessage(this.transferableArray, [this.transferableArray.buffer]);

Currently in my code, I am checking if it's neutered like this:

if (!transferableArray.length) {
    return false;
}

Is this the correct way to check for neutering, or is there a more efficient method to determine if the array is neutered? In a game like mine, every millisecond gained is crucial.

javascript arrays web-worker transferable

Answer 1

Answer №1

Once an array is sent, it loses its relevance, so I opt to unset the property after its transmission.

worker.postMessage(this.transferableArray, [this.transferableArray.buffer]);
this.transferableArray = undefined;

Now, it's simple to verify if the array has returned at any given moment.

if(!this.transferableArray) {
    return;
}

Answer 2

Once an array is sent, it loses its relevance, so I opt to unset the property after its transmission.

worker.postMessage(this.transferableArray, [this.transferableArray.buffer]);
this.transferableArray = undefined;

Now, it's simple to verify if the array has returned at any given moment.

if(!this.transferableArray) {
    return;
}

Answer 3

Answer №2

When checking for a `.byteLength` of 0, you will likely cover 99% of cases.

In situations where you need to address the remaining 1%, you can utilize the slice() method, which will throw an error if the ArrayBuffer is detached.

function checkDetached( arrayBuffer ) {
  if( arrayBuffer.byteLength > 0 ) { return false; }
  try {
    arrayBuffer.slice( 0, 0 );
    return false;
  }
  catch( e ) {
    return true;
  }
}

const data = new Float32Array( 0 );

console.log( 'before transferring data:', checkDetached( data.buffer ) );

// data transfer
const channel = new MessageChannel();
channel.port1.postMessage( data, [ data.buffer ] );

console.log( 'after transferring data:', checkDetached( data.buffer ) );

Answer 4

When checking for a `.byteLength` of 0, you will likely cover 99% of cases.

In situations where you need to address the remaining 1%, you can utilize the slice() method, which will throw an error if the ArrayBuffer is detached.

function checkDetached( arrayBuffer ) {
  if( arrayBuffer.byteLength > 0 ) { return false; }
  try {
    arrayBuffer.slice( 0, 0 );
    return false;
  }
  catch( e ) {
    return true;
  }
}

const data = new Float32Array( 0 );

console.log( 'before transferring data:', checkDetached( data.buffer ) );

// data transfer
const channel = new MessageChannel();
channel.port1.postMessage( data, [ data.buffer ] );

console.log( 'after transferring data:', checkDetached( data.buffer ) );

Determining neutering status of transferable object in JavaScript Float32Array

Answer №1

Answer №2

When checking for a `.byteLength` of 0, you will likely cover 99% of cases.

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