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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2020 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
@testable import NIO
import Dispatch
import NIOConcurrencyHelpers
class NIOThreadPoolTest: XCTestCase {
func testThreadNamesAreSetUp() {
let numberOfThreads = 11
let pool = NIOThreadPool(numberOfThreads: numberOfThreads)
pool.start()
defer {
XCTAssertNoThrow(try pool.syncShutdownGracefully())
}
var allThreadNames: Set<String> = []
let lock = Lock()
let threadNameCollectionSem = DispatchSemaphore(value: 0)
let threadBlockingSem = DispatchSemaphore(value: 0)
// let's use up all the threads
for i in (0..<numberOfThreads) {
pool.submit { s in
switch s {
case .cancelled:
XCTFail("work item \(i) cancelled")
case .active:
lock.withLock {
allThreadNames.formUnion([NIOThread.current.currentName ?? "n/a"])
}
threadNameCollectionSem.signal()
}
threadBlockingSem.wait()
}
}
// now, let's wait for all the threads to have done their work
(0..<numberOfThreads).forEach { _ in
threadNameCollectionSem.wait()
}
// and finally, let them exit
(0..<numberOfThreads).forEach { _ in
threadBlockingSem.signal()
}
let localAllThreads = lock.withLock { allThreadNames }
for threadNumber in (0..<numberOfThreads) {
XCTAssert(localAllThreads.contains("TP-#\(threadNumber)"), "\(localAllThreads)")
}
}
func testThreadPoolStartsMultipleTimes() throws {
let numberOfThreads = 1
let pool = NIOThreadPool(numberOfThreads: numberOfThreads)
pool.start()
defer {
XCTAssertNoThrow(try pool.syncShutdownGracefully())
}
let completionGroup = DispatchGroup()
// The lock here is arguably redundant with the dispatchgroup, but let's make
// this test thread-safe even if I screw up.
let lock = Lock()
var threadOne = Thread?.none
var threadTwo = Thread?.none
completionGroup.enter()
pool.submit { s in
precondition(s == .active)
lock.withLockVoid {
XCTAssertEqual(threadOne, nil)
threadOne = Thread.current
}
completionGroup.leave()
}
// Now start the thread pool again. This must not destroy existing threads, so our thread should be the same.
pool.start()
completionGroup.enter()
pool.submit { s in
precondition(s == .active)
lock.withLockVoid {
XCTAssertEqual(threadTwo, nil)
threadTwo = Thread.current
}
completionGroup.leave()
}
completionGroup.wait()
lock.withLockVoid {
XCTAssertNotNil(threadOne)
XCTAssertNotNil(threadTwo)
XCTAssertEqual(threadOne, threadTwo)
}
}
}
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