/**
 * read-queue.ts
 *
 * FIFO concurrency limiter for readRegion calls inside a worker. Caps how
 * many reads hold WASM result buffers at once (memory exhaustion guard) and
 * lets still-queued reads be cancelled before they start executing.
 */
/** Rejection used when a queued read is cancelled before it runs. */
export declare class ReadCancelledError extends Error {
    readonly code = "cancelled";
    constructor();
}
export declare class ReadQueue {
    private readonly maxConcurrent;
    private active;
    private waiters;
    constructor(maxConcurrent?: number);
    /**
     * Wait for a read slot. Resolves when the caller may start the read;
     * rejects with ReadCancelledError if cancelled while still queued.
     */
    acquire(id: number): Promise<void>;
    /** Release a slot acquired via acquire(). */
    release(): void;
    /**
     * Cancel a read that is still waiting for a slot. Returns true if the
     * entry was found and rejected; false if it already started (or finished).
     */
    cancel(id: number): boolean;
}
//# sourceMappingURL=read-queue.d.ts.map