import { IDataHook, Field } from "model-react";
export declare class Semaphore {
    protected maxConcurrency: number;
    protected queue: Array<(lease: [number, () => void]) => void>;
    protected currentReleaser: (() => void) | undefined;
    protected value: Field<number>;
    /**
     * Creates a new semaphore
     * @param maxConcurrency The maximum concurrency
     */
    constructor(maxConcurrency: number);
    /**
     * Acquires the semaphore
     * @returns The number of claims remaining and a function that can be used to release the resource
     */
    acquire(): Promise<[number, () => void]>;
    /**
     * Runs the given function and makes sure to acquire and release the semaphore
     * @param callback The callback to run
     * @returns The result of the callback
     */
    runExclusive<T>(callback: (value: number) => Promise<T> | T): Promise<T>;
    /**
     * Checks whether the semaphore is locked
     * @param hook A hook to subscribe to changes
     * @returns Whether the semaphore is locked
     */
    isLocked(hook?: IDataHook): boolean;
    /**
     * Releases the semaphore if locked.
     * Only available on semaphores with concurrency = 1.
     */
    release(): void;
    /**
     * Dispatches an update in order to continue with the next consumer if present
     */
    protected _dispatch(): void;
}
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