multithreading/src/lib/check_move_args.js

The missing standard library for multithreading in JavaScript (Works in the browser, Node.js, Deno, Bun).

import { Barrier, Condvar, Mutex, Receiver, RwLock, Semaphore, Sender, } from "./lib.js";
import { toSerialized } from "./shared.js";
const WARNING_MSG = "Warning: You are passing a SharedArrayBuffer to a worker without locking. Please wrap this data in a Mutex() or RwLock() to prevent race conditions.";
function warnUnsafe() {
    console.warn(WARNING_MSG);
}
export function checkMoveArgs(args) {
    const len = args.length;
    for (let i = 0; i < len; i++) {
        const arg = args[i];
        // If it's null or not an object, it cannot be a SAB or Class Instance.
        if (!arg || typeof arg !== "object")
            continue;
        if (arg instanceof SharedArrayBuffer) {
            warnUnsafe();
            continue;
        }
        // We strictly use isView first (native slot check) to avoid accessing .buffer on random objects
        if (ArrayBuffer.isView(arg) && arg.buffer instanceof SharedArrayBuffer) {
            warnUnsafe();
            continue;
        }
        if (arg[toSerialized] !== undefined) {
            if (arg instanceof Mutex ||
                arg instanceof Condvar ||
                arg instanceof RwLock ||
                arg instanceof Sender ||
                arg instanceof Receiver ||
                arg instanceof Semaphore ||
                arg instanceof Barrier) {
                continue;
            }
            // If it had the symbol but wasn't a lock, it's unsafe.
            warnUnsafe();
        }
    }
}