export declare const DEFAULT_PERMIT_SEMAPHORE_MAX_QUEUE_SIZE = 10000;
export interface PermitSemaphoreOptions {
    /** Maximum number of queued acquirers. */
    maxQueueSize?: number;
}
/**
 * FIFO semaphore for callers that acquire and release permits explicitly.
 *
 * A zero-permit semaphore is supported for admission tests and externally
 * released gates. Constructor and timeout inputs are validated so runtimes
 * cannot silently clamp invalid timers into hot loops.
 */
export declare class PermitSemaphore {
    private permits;
    private readonly maxPermits;
    private readonly maxQueueSize;
    private readonly waitQueue;
    constructor(permits: number, options?: PermitSemaphoreOptions);
    tryAcquire(timeoutMs?: number, options?: {
        signal?: AbortSignal;
    }): Promise<boolean>;
    release(): void;
    get available(): number;
    get waiting(): number;
    get capacity(): number;
    get queueCapacity(): number;
}
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