export interface SchedulerLockOptions {
    dir?: string;
    sessionId?: string;
}
/**
 * Try to acquire the scheduler lock using an atomic exclusive create.
 * If the lock already exists, checks PID liveness for stale recovery.
 * Returns true if this process now owns the lock.
 */
export declare function tryAcquireSchedulerLock(opts?: SchedulerLockOptions): Promise<boolean>;
/**
 * Release the scheduler lock if this process owns it.
 */
export declare function releaseSchedulerLock(opts?: SchedulerLockOptions): Promise<void>;
/**
 * Synchronous version for use in process exit handlers where async is not available.
 */
export declare function releaseSchedulerLockSync(opts?: SchedulerLockOptions): void;
/**
 * Register a cleanup handler to release the lock on process exit.
 * Returns a dispose function to remove the listeners (call in test teardown).
 */
export declare function registerSchedulerLockCleanup(opts?: SchedulerLockOptions): () => void;