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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2017-2018 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import XCTest
import NIO
import Dispatch
import Foundation
class BlockingIOThreadPoolTest: XCTestCase {
func testDoubleShutdownWorks() throws {
let threadPool = NIOThreadPool(numberOfThreads: 17)
threadPool.start()
try threadPool.syncShutdownGracefully()
try threadPool.syncShutdownGracefully()
}
func testStateCancelled() throws {
let threadPool = NIOThreadPool(numberOfThreads: 17)
let group = DispatchGroup()
group.enter()
threadPool.submit { state in
XCTAssertEqual(NIOThreadPool.WorkItemState.cancelled, state)
group.leave()
}
group.wait()
try threadPool.syncShutdownGracefully()
}
func testStateActive() throws {
let threadPool = NIOThreadPool(numberOfThreads: 17)
threadPool.start()
let group = DispatchGroup()
group.enter()
threadPool.submit { state in
XCTAssertEqual(NIOThreadPool.WorkItemState.active, state)
group.leave()
}
group.wait()
try threadPool.syncShutdownGracefully()
}
func testLoseLastReferenceAndShutdownWhileTaskStillRunning() throws {
let blockThreadSem = DispatchSemaphore(value: 0)
let allDoneSem = DispatchSemaphore(value: 0)
({
let threadPool = NIOThreadPool(numberOfThreads: 2)
threadPool.start()
threadPool.submit { _ in
Foundation.Thread.sleep(forTimeInterval: 0.1)
}
threadPool.submit { _ in
blockThreadSem.wait()
}
threadPool.shutdownGracefully { error in
XCTAssertNil(error)
allDoneSem.signal()
}
})()
blockThreadSem.signal()
allDoneSem.wait()
}
func testDeadLockIfCalledOutWithLockHeld() throws {
let blockRunningSem = DispatchSemaphore(value: 0)
let blockOneThreadSem = DispatchSemaphore(value: 0)
let threadPool = NIOThreadPool(numberOfThreads: 1)
let allDone = DispatchSemaphore(value: 0)
threadPool.start()
// enqueue one that'll block the whole pool (1 thread only)
threadPool.submit { state in
XCTAssertEqual(state, .active)
blockRunningSem.signal()
blockOneThreadSem.wait()
}
blockRunningSem.wait()
// enqueue one that will be cancelled and then calls shutdown again which needs the lock
threadPool.submit { state in
XCTAssertEqual(state, .cancelled)
threadPool.shutdownGracefully { error in
XCTAssertNil(error)
}
}
threadPool.shutdownGracefully { error in
XCTAssertNil(error)
allDone.signal()
}
blockOneThreadSem.signal() // that'll unblock the thread in the pool
allDone.wait()
}
func testPoolDoesGetReleasedWhenStoppedAndReferencedDropped() throws {
let taskRunningSem = DispatchSemaphore(value: 0)
let doneSem = DispatchSemaphore(value: 0)
let shutdownDoneSem = DispatchSemaphore(value: 0)
weak var weakThreadPool: NIOThreadPool? = nil
({
let threadPool = NIOThreadPool(numberOfThreads: 1)
weakThreadPool = threadPool
threadPool.start()
threadPool.submit { state in
XCTAssertEqual(.active, state)
taskRunningSem.signal()
doneSem.wait()
}
taskRunningSem.wait()
threadPool.shutdownGracefully { error in
XCTAssertNil(error)
shutdownDoneSem.signal()
}
})()
XCTAssertNotNil(weakThreadPool)
doneSem.signal()
shutdownDoneSem.wait()
assert(weakThreadPool == nil, within: .seconds(1))
}
class SomeClass {
init() {}
func dummy() {}
}
func testClosureReferenceDroppedAfterSingleWorkItemExecution() throws {
let taskRunningSem = DispatchSemaphore(value: 0)
let doneSem = DispatchSemaphore(value: 0)
let threadPool = NIOThreadPool(numberOfThreads: 1)
threadPool.start()
weak var referencedObject: SomeClass? = nil
({
let object = SomeClass()
referencedObject = object
threadPool.submit { state in
XCTAssertEqual(.active, state)
taskRunningSem.signal()
object.dummy()
doneSem.wait()
}
})()
taskRunningSem.wait()
doneSem.signal()
assert(referencedObject == nil, within: .seconds(1))
try threadPool.syncShutdownGracefully()
}
func testClosureReferencesDroppedAfterTwoConsecutiveWorkItemsExecution() throws {
let taskRunningSem = DispatchSemaphore(value: 0)
let doneSem = DispatchSemaphore(value: 0)
let threadPool = NIOThreadPool(numberOfThreads: 1)
threadPool.start()
weak var referencedObject1: SomeClass? = nil
weak var referencedObject2: SomeClass? = nil
({
let object1 = SomeClass()
let object2 = SomeClass()
referencedObject1 = object1
referencedObject2 = object2
threadPool.submit { state in
XCTAssertEqual(.active, state)
taskRunningSem.signal()
object1.dummy()
doneSem.wait()
}
threadPool.submit { state in
XCTAssertEqual(.active, state)
taskRunningSem.signal()
object2.dummy()
doneSem.wait()
}
})()
taskRunningSem.wait()
doneSem.signal()
taskRunningSem.wait()
doneSem.signal()
assert(referencedObject1 == nil, within: .seconds(1))
assert(referencedObject2 == nil, within: .seconds(1))
try threadPool.syncShutdownGracefully()
}
}
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