hash-wasm/lib/mutex.ts

Lightning fast hash functions for browsers and Node.js using hand-tuned WebAssembly binaries (MD4, MD5, SHA-1, SHA-2, SHA-3, Keccak, BLAKE2, BLAKE3, PBKDF2, Argon2, bcrypt, scrypt, Adler-32, CRC32, CRC32C, RIPEMD-160, HMAC, xxHash, SM3, Whirlpool)

class Mutex {
	private mutex = Promise.resolve();

	lock(): PromiseLike<() => void> {
		let begin: (unlock: () => void) => void = () => {};

		this.mutex = this.mutex.then(() => new Promise(begin));

		return new Promise((res) => {
			begin = res;
		});
	}

	async dispatch<T>(fn: () => PromiseLike<T>): Promise<T> {
		const unlock = await this.lock();
		try {
			return await Promise.resolve(fn());
		} finally {
			unlock();
		}
	}
}

export default Mutex;