Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 | 26x 1822x 26x 26x 4201x 1222x 1831x 2098x 2098x 2098x 4x 4x 4x 4x 4x 1x 1x 2x 4x 1822x 1822x 1822x 1822x | import { AtomicBoolean } from "@jonloucks/contracts-ts/auxiliary/AtomicBoolean";
import { RequiredType } from "@jonloucks/contracts-ts/api/Types";
/**
* Factory to create an AtomicBoolean implementation
*
* @param initialValue the initial boolean value
* @returns the new AtomicBoolean implementation
*/
export function create(initialValue?: boolean): RequiredType<AtomicBoolean> {
return AtomicBooleanImpl.internalCreate(initialValue);
}
// ---- Implementation details below ----
const FALSE_AS_NUMBER: number = 0;
const TRUE_AS_NUMBER: number = 1;
function booleanToNumber(value: boolean): number {
return value ? TRUE_AS_NUMBER : FALSE_AS_NUMBER;
}
/**
* Implementation of AtomicBoolean.
*/
class AtomicBooleanImpl implements AtomicBoolean {
/**
* AtomicBoolean.get override
*/
get(): boolean {
// Atomics.load ensures thread-safe reading
return Atomics.load(this.#array, 0) === TRUE_AS_NUMBER;
}
/**
* AtomicBoolean.set override
*/
set(value: boolean): void {
// Atomics.store ensures thread-safe writing
Atomics.store(this.#array, 0, value ? TRUE_AS_NUMBER : FALSE_AS_NUMBER);
}
/**
* AtomicBoolean.compareAndSet override
*/
compareAndSet(expected: boolean, newValue: boolean): boolean {
const expectedVal: number = booleanToNumber(expected);
const newTargetVal: number = booleanToNumber(newValue);
// Atomics.compareExchange checks value and sets it if it matches expectation
return Atomics.compareExchange(this.#array, 0, expectedVal, newTargetVal) === expectedVal;
}
/**
* AtomicBoolean.getAndSet override
*/
getAndSet(newValue: boolean): boolean {
const newTargetVal: number = booleanToNumber(newValue);
const previousVal: number = Atomics.exchange(this.#array, 0, newTargetVal);
return previousVal === TRUE_AS_NUMBER;
}
/**
* [Symbol.toPrimitive] override
*/
[Symbol.toPrimitive](hint: string): string | boolean | number {
const value: boolean = this.get();
switch (hint) {
case 'string':
return value.toString();
case 'number':
return booleanToNumber(value);
default:
return value;
}
}
/**
* Object.toString override
*/
toString(): string {
return this.get().toString();
}
static internalCreate(initialValue?: boolean): AtomicBoolean {
return new AtomicBooleanImpl(initialValue ?? false);
}
private constructor(initialValue: boolean) {
this.set(initialValue);
}
readonly #buffer: SharedArrayBuffer = new SharedArrayBuffer(4);
readonly #array: Int32Array = new Int32Array(this.#buffer);
}
|