/**
 * Coordinates shared access inside transactions with read and write locks.
 *
 * A `TxReentrantLock` lets many fibers hold read locks at the same time, or one
 * fiber hold a write lock for exclusive access. Lock ownership is tracked by
 * fiber, so a fiber that already holds the lock can acquire it again and later
 * release each acquisition. Attempts that cannot proceed retry transactionally
 * until the lock becomes available. This module includes manual, scoped, and
 * wrapper-style operations for read and write locking.
 *
 * @stability stable
 * @since 4.0.0
 */
import * as Effect from "./Effect.ts";
import type { Inspectable } from "./Inspectable.ts";
import type { Pipeable } from "./Pipeable.ts";
import type * as Scope from "./Scope.ts";
declare const TypeId = "~effect/TxReentrantLock";
/**
 * A TxReentrantLock provides a transactional read/write lock with reentrant semantics.
 * Multiple readers can hold the lock concurrently, or a single writer can hold exclusive
 * access. A fiber holding the write lock may acquire additional read/write locks (reentrancy).
 *
 * **Example** (Using read and write locks)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *
 *   // Multiple readers can proceed concurrently
 *   const read = yield* TxReentrantLock.withReadLock(lock, Effect.succeed("reading"))
 *
 *   // Writer gets exclusive access
 *   const write = yield* TxReentrantLock.withWriteLock(lock, Effect.succeed("writing"))
 *   return [read, write]
 * })
 *
 * await Effect.runPromise(program) // => ["reading", "writing"]
 * ```
 *
 * @stability stable
 * @category models
 * @since 4.0.0
 */
export interface TxReentrantLock extends Inspectable, Pipeable {
    readonly [TypeId]: typeof TypeId;
}
/**
 * Creates a new TxReentrantLock.
 *
 * **Example** (Creating a reentrant lock)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *   return yield* TxReentrantLock.locked(lock)
 * })
 *
 * await Effect.runPromise(program) // => false
 * ```
 *
 * @stability stable
 * @category constructors
 * @since 2.0.0
 */
export declare const make: () => Effect.Effect<TxReentrantLock>;
/**
 * Acquires a read lock. Blocks if another fiber holds the write lock.
 * If the current fiber already holds the write lock, the read lock is granted (reentrancy).
 * Returns the current number of read locks held by this fiber.
 *
 * **Example** (Acquiring a read lock)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *   const count = yield* TxReentrantLock.acquireRead(lock)
 *   yield* TxReentrantLock.releaseRead(lock)
 *   return count
 * })
 *
 * await Effect.runPromise(program) // => 1
 * ```
 *
 * @stability stable
 * @category mutations
 * @since 2.0.0
 */
export declare const acquireRead: (self: TxReentrantLock) => Effect.Effect<number>;
/**
 * Acquires the write lock for the current fiber.
 *
 * **When to use**
 *
 * Use to enter an exclusive section manually when `withWriteLock` is not the
 * right shape.
 *
 * **Details**
 *
 * Blocks if any other fiber holds a read or write lock. If the current fiber
 * already holds the write lock, the count is incremented. If the current fiber
 * holds a read lock, the write lock is granted as an upgrade.
 *
 * Returns the current number of write locks held by this fiber.
 *
 * **Example** (Acquiring a write lock)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *   const count = yield* TxReentrantLock.acquireWrite(lock)
 *   yield* TxReentrantLock.releaseWrite(lock)
 *   return count
 * })
 *
 * await Effect.runPromise(program) // => 1
 * ```
 *
 * @stability stable
 * @category mutations
 * @since 2.0.0
 */
export declare const acquireWrite: (self: TxReentrantLock) => Effect.Effect<number>;
/**
 * Releases one read lock held by the current fiber.
 *
 * **When to use**
 *
 * Use to leave a manually acquired read lock.
 *
 * **Details**
 *
 * Returns the remaining number of read locks held by this fiber.
 *
 * @stability stable
 * @category mutations
 * @since 2.0.0
 */
export declare const releaseRead: (self: TxReentrantLock) => Effect.Effect<number>;
/**
 * Releases one write lock held by the current fiber.
 *
 * **When to use**
 *
 * Use to leave a manually acquired write lock.
 *
 * **Details**
 *
 * Returns the remaining number of write locks held by this fiber.
 *
 * @stability stable
 * @category mutations
 * @since 2.0.0
 */
export declare const releaseWrite: (self: TxReentrantLock) => Effect.Effect<number>;
/**
 * Acquires a read lock for the duration of the scope.
 * The lock is automatically released when the scope closes.
 *
 * **Example** (Holding a scoped read lock)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *
 *   const held = yield* Effect.scoped(
 *     Effect.gen(function*() {
 *       yield* TxReentrantLock.readLock(lock)
 *       // read lock is held for the duration of the scope
 *       return yield* TxReentrantLock.readLocks(lock)
 *     })
 *   )
 *   // read lock is released
 *   return [held, yield* TxReentrantLock.readLocks(lock)]
 * })
 *
 * await Effect.runPromise(program) // => [1, 0]
 * ```
 *
 * @stability stable
 * @category mutations
 * @since 2.0.0
 */
export declare const readLock: (self: TxReentrantLock) => Effect.Effect<number, never, Scope.Scope>;
/**
 * Acquires a write lock for the duration of the scope.
 * The lock is automatically released when the scope closes.
 *
 * **Example** (Holding a scoped write lock)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *
 *   const held = yield* Effect.scoped(
 *     Effect.gen(function*() {
 *       yield* TxReentrantLock.writeLock(lock)
 *       // write lock is held for the duration of the scope
 *       return yield* TxReentrantLock.writeLocks(lock)
 *     })
 *   )
 *   // write lock is released
 *   return [held, yield* TxReentrantLock.writeLocks(lock)]
 * })
 *
 * await Effect.runPromise(program) // => [1, 0]
 * ```
 *
 * @stability stable
 * @category mutations
 * @since 2.0.0
 */
export declare const writeLock: (self: TxReentrantLock) => Effect.Effect<number, never, Scope.Scope>;
/**
 * Runs the provided effect while holding a read lock. The lock is automatically
 * released after the effect completes, fails, or is interrupted.
 *
 * **Example** (Running an effect with a read lock)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *   return yield* TxReentrantLock.withReadLock(
 *     lock,
 *     Effect.succeed("read data")
 *   )
 * })
 *
 * await Effect.runPromise(program) // => "read data"
 * ```
 *
 * @stability stable
 * @category mutations
 * @since 2.0.0
 */
export declare const withReadLock: {
    /**
     * Runs the provided effect while holding a read lock. The lock is automatically
     * released after the effect completes, fails, or is interrupted.
     *
     * **Example** (Running an effect with a read lock)
     *
     * ```ts import.meta.vitest
     * import { Effect, TxReentrantLock } from "effect"
     *
     * const program = Effect.gen(function*() {
     *   const lock = yield* TxReentrantLock.make()
     *   return yield* TxReentrantLock.withReadLock(
     *     lock,
     *     Effect.succeed("read data")
     *   )
     * })
     *
     * await Effect.runPromise(program) // => "read data"
     * ```
     *
     * @stability stable
     * @category mutations
     * @since 2.0.0
     */
    <A, E, R>(effect: Effect.Effect<A, E, R>): (self: TxReentrantLock) => Effect.Effect<A, E, R>;
    /**
     * Runs the provided effect while holding a read lock. The lock is automatically
     * released after the effect completes, fails, or is interrupted.
     *
     * **Example** (Running an effect with a read lock)
     *
     * ```ts import.meta.vitest
     * import { Effect, TxReentrantLock } from "effect"
     *
     * const program = Effect.gen(function*() {
     *   const lock = yield* TxReentrantLock.make()
     *   return yield* TxReentrantLock.withReadLock(
     *     lock,
     *     Effect.succeed("read data")
     *   )
     * })
     *
     * await Effect.runPromise(program) // => "read data"
     * ```
     *
     * @stability stable
     * @category mutations
     * @since 2.0.0
     */
    <A, E, R>(self: TxReentrantLock, effect: Effect.Effect<A, E, R>): Effect.Effect<A, E, R>;
};
/**
 * Runs the provided effect while holding a write lock. The lock is automatically
 * released after the effect completes, fails, or is interrupted.
 *
 * **Example** (Running an effect with a write lock)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *   return yield* TxReentrantLock.withWriteLock(
 *     lock,
 *     Effect.succeed("wrote data")
 *   )
 * })
 *
 * await Effect.runPromise(program) // => "wrote data"
 * ```
 *
 * @stability stable
 * @category mutations
 * @since 2.0.0
 */
export declare const withWriteLock: {
    /**
     * Runs the provided effect while holding a write lock. The lock is automatically
     * released after the effect completes, fails, or is interrupted.
     *
     * **Example** (Running an effect with a write lock)
     *
     * ```ts import.meta.vitest
     * import { Effect, TxReentrantLock } from "effect"
     *
     * const program = Effect.gen(function*() {
     *   const lock = yield* TxReentrantLock.make()
     *   return yield* TxReentrantLock.withWriteLock(
     *     lock,
     *     Effect.succeed("wrote data")
     *   )
     * })
     *
     * await Effect.runPromise(program) // => "wrote data"
     * ```
     *
     * @stability stable
     * @category mutations
     * @since 2.0.0
     */
    <A, E, R>(effect: Effect.Effect<A, E, R>): (self: TxReentrantLock) => Effect.Effect<A, E, R>;
    /**
     * Runs the provided effect while holding a write lock. The lock is automatically
     * released after the effect completes, fails, or is interrupted.
     *
     * **Example** (Running an effect with a write lock)
     *
     * ```ts import.meta.vitest
     * import { Effect, TxReentrantLock } from "effect"
     *
     * const program = Effect.gen(function*() {
     *   const lock = yield* TxReentrantLock.make()
     *   return yield* TxReentrantLock.withWriteLock(
     *     lock,
     *     Effect.succeed("wrote data")
     *   )
     * })
     *
     * await Effect.runPromise(program) // => "wrote data"
     * ```
     *
     * @stability stable
     * @category mutations
     * @since 2.0.0
     */
    <A, E, R>(self: TxReentrantLock, effect: Effect.Effect<A, E, R>): Effect.Effect<A, E, R>;
};
/**
 * Runs an effect while holding a write lock.
 *
 * **When to use**
 *
 * Use when you need to run an effect with exclusive write access through a
 * `TxReentrantLock` and prefer the concise lock helper.
 *
 * **Example** (Running an effect with exclusive access)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *   return yield* TxReentrantLock.withLock(
 *     lock,
 *     Effect.succeed("exclusive operation")
 *   )
 * })
 *
 * await Effect.runPromise(program) // => "exclusive operation"
 * ```
 *
 * @stability stable
 * @category mutations
 * @since 2.0.0
 */
export declare const withLock: {
    /**
     * Runs an effect while holding a write lock.
     *
     * **When to use**
     *
     * Use when you need to run an effect with exclusive write access through a
     * `TxReentrantLock` and prefer the concise lock helper.
     *
     * **Example** (Running an effect with exclusive access)
     *
     * ```ts import.meta.vitest
     * import { Effect, TxReentrantLock } from "effect"
     *
     * const program = Effect.gen(function*() {
     *   const lock = yield* TxReentrantLock.make()
     *   return yield* TxReentrantLock.withLock(
     *     lock,
     *     Effect.succeed("exclusive operation")
     *   )
     * })
     *
     * await Effect.runPromise(program) // => "exclusive operation"
     * ```
     *
     * @stability stable
     * @category mutations
     * @since 2.0.0
     */
    <A, E, R>(effect: Effect.Effect<A, E, R>): (self: TxReentrantLock) => Effect.Effect<A, E, R>;
    /**
     * Runs an effect while holding a write lock.
     *
     * **When to use**
     *
     * Use when you need to run an effect with exclusive write access through a
     * `TxReentrantLock` and prefer the concise lock helper.
     *
     * **Example** (Running an effect with exclusive access)
     *
     * ```ts import.meta.vitest
     * import { Effect, TxReentrantLock } from "effect"
     *
     * const program = Effect.gen(function*() {
     *   const lock = yield* TxReentrantLock.make()
     *   return yield* TxReentrantLock.withLock(
     *     lock,
     *     Effect.succeed("exclusive operation")
     *   )
     * })
     *
     * await Effect.runPromise(program) // => "exclusive operation"
     * ```
     *
     * @stability stable
     * @category mutations
     * @since 2.0.0
     */
    <A, E, R>(self: TxReentrantLock, effect: Effect.Effect<A, E, R>): Effect.Effect<A, E, R>;
};
/**
 * Returns the total number of read locks held across all fibers.
 *
 * **Example** (Counting read locks)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *   yield* TxReentrantLock.acquireRead(lock)
 *   const count = yield* TxReentrantLock.readLocks(lock)
 *   yield* TxReentrantLock.releaseRead(lock)
 *   return count
 * })
 *
 * await Effect.runPromise(program) // => 1
 * ```
 *
 * @stability stable
 * @category getters
 * @since 2.0.0
 */
export declare const readLocks: (self: TxReentrantLock) => Effect.Effect<number>;
/**
 * Returns the number of write locks held (0 or the reentrant count).
 *
 * **Example** (Counting write locks)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *   return yield* TxReentrantLock.writeLocks(lock)
 * })
 *
 * await Effect.runPromise(program) // => 0
 * ```
 *
 * @stability stable
 * @category getters
 * @since 2.0.0
 */
export declare const writeLocks: (self: TxReentrantLock) => Effect.Effect<number>;
/**
 * Checks whether the lock is held by any fiber (read or write).
 *
 * **Example** (Checking whether a lock is held)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *   return yield* TxReentrantLock.locked(lock)
 * })
 *
 * await Effect.runPromise(program) // => false
 * ```
 *
 * @stability stable
 * @category getters
 * @since 2.0.0
 */
export declare const locked: (self: TxReentrantLock) => Effect.Effect<boolean>;
/**
 * Checks whether any fiber holds a read lock.
 *
 * **Example** (Checking whether a read lock is held)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *   return yield* TxReentrantLock.readLocked(lock)
 * })
 *
 * await Effect.runPromise(program) // => false
 * ```
 *
 * @stability stable
 * @category getters
 * @since 2.0.0
 */
export declare const readLocked: (self: TxReentrantLock) => Effect.Effect<boolean>;
/**
 * Checks whether any fiber holds a write lock.
 *
 * **Example** (Checking whether a write lock is held)
 *
 * ```ts import.meta.vitest
 * import { Effect, TxReentrantLock } from "effect"
 *
 * const program = Effect.gen(function*() {
 *   const lock = yield* TxReentrantLock.make()
 *   return yield* TxReentrantLock.writeLocked(lock)
 * })
 *
 * await Effect.runPromise(program) // => false
 * ```
 *
 * @stability stable
 * @category getters
 * @since 2.0.0
 */
export declare const writeLocked: (self: TxReentrantLock) => Effect.Effect<boolean>;
/**
 * Checks whether the given value is a TxReentrantLock.
 *
 * **Example** (Checking for TxReentrantLock values)
 *
 * ```ts import.meta.vitest
 * import { TxReentrantLock } from "effect"
 *
 * const someValue: unknown = {}
 *
 * TxReentrantLock.isTxReentrantLock(someValue) // => false
 * ```
 *
 * @stability stable
 * @category guards
 * @since 4.0.0
 */
export declare const isTxReentrantLock: (u: unknown) => u is TxReentrantLock;
export {};
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