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ant/examples/demo/atomics.js
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atomics.js
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console.log('1. Creating SharedArrayBuffer');
const sharedBuffer = new SharedArrayBuffer(256);
console.log(' SharedArrayBuffer created with size:', sharedBuffer.byteLength, 'bytes\n');
console.log('2. Creating TypedArrays on SharedArrayBuffer');
const int32View = new Int32Array(sharedBuffer);
const uint8View = new Uint8Array(sharedBuffer);
console.log(' Int32Array length:', int32View.length);
console.log(' Uint8Array length:', uint8View.length, '\n');
console.log('3. Basic atomic store and load');
Atomics.store(int32View, 0, 42);
const value = Atomics.load(int32View, 0);
console.log(' Stored 42, loaded:', value, '\n');
console.log('4. Atomic add operation');
Atomics.store(int32View, 1, 10);
const oldValue = Atomics.add(int32View, 1, 5);
const newValue = Atomics.load(int32View, 1);
console.log(' Old value:', oldValue);
console.log(' Added 5, new value:', newValue, '\n');
console.log('5. Compare and exchange');
Atomics.store(int32View, 2, 100);
console.log(' Initial value:', Atomics.load(int32View, 2));
const result1 = Atomics.compareExchange(int32View, 2, 50, 200);
console.log(' Expected 50, got:', result1, '(no change)');
console.log(' Current value:', Atomics.load(int32View, 2));
const result2 = Atomics.compareExchange(int32View, 2, 100, 200);
console.log(' Expected 100, got:', result2, '(changed!)');
console.log(' Current value:', Atomics.load(int32View, 2), '\n');
console.log('6. Bitwise operations');
Atomics.store(uint8View, 0, 0b11110000);
console.log(' Initial: 0b' + Atomics.load(uint8View, 0).toString(2).padStart(8, '0'));
Atomics.and(uint8View, 0, 0b00111100);
console.log(' After AND with 0b00111100: 0b' + Atomics.load(uint8View, 0).toString(2).padStart(8, '0'));
Atomics.or(uint8View, 0, 0b00000011);
console.log(' After OR with 0b00000011: 0b' + Atomics.load(uint8View, 0).toString(2).padStart(8, '0'));
Atomics.xor(uint8View, 0, 0b11111111);
console.log(' After XOR with 0b11111111: 0b' + Atomics.load(uint8View, 0).toString(2).padStart(8, '0'), '\n');
console.log('7. Lock-free operations check');
console.log(' 1 byte:', Atomics.isLockFree(1) ? 'Lock-free ✓' : 'Uses locks');
console.log(' 2 bytes:', Atomics.isLockFree(2) ? 'Lock-free ✓' : 'Uses locks');
console.log(' 4 bytes:', Atomics.isLockFree(4) ? 'Lock-free ✓' : 'Uses locks');
console.log(' 8 bytes:', Atomics.isLockFree(8) ? 'Lock-free ✓' : 'Uses locks', '\n');
console.log('8. Atomic counter example');
Atomics.store(int32View, 10, 0);
console.log(' Counter initialized to:', Atomics.load(int32View, 10));
for (let i = 0; i < 10; i++) {
Atomics.add(int32View, 10, 1);
}
console.log(' After 10 atomic increments:', Atomics.load(int32View, 10), '\n');
console.log('9. Spin-lock pattern example');
const LOCK_INDEX = 20;
const UNLOCKED = 0;
const LOCKED = 1;
Atomics.store(int32View, LOCK_INDEX, UNLOCKED);
console.log(' Lock initialized');
function tryAcquireLock() {
return Atomics.compareExchange(int32View, LOCK_INDEX, UNLOCKED, LOCKED) === UNLOCKED;
}
function releaseLock() {
Atomics.store(int32View, LOCK_INDEX, UNLOCKED);
}
if (tryAcquireLock()) {
console.log(' Lock acquired ✓');
console.log(' Performing critical operation...');
releaseLock();
console.log(' Lock released ✓');
} else {
console.log(' Failed to acquire lock');
}
console.log('\n=== Example completed successfully ===');

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