kysely/dist/driver/connection-mutex.js

Type safe SQL query builder

/// <reference types="./connection-mutex.d.ts" />
/**
 * This mutex is used to ensure that only one operation at a time can
 * acquire a connection from the driver. This is necessary when the
 * driver only has a single connection, like SQLite and PGlite.
 *
 * @internal
 */
export class ConnectionMutex {
    #promise;
    #resolve;
    async obtainLock() {
        while (this.#promise) {
            await this.#promise;
        }
        this.#promise = new Promise((resolve) => {
            this.#resolve = resolve;
        });
    }
    releaseLock() {
        const resolve = this.#resolve;
        this.#promise = undefined;
        this.#resolve = undefined;
        resolve?.();
    }
}