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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2017-2019 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
//
//===----------------------------------------------------------------------===//
@testable import NIO
import NIOConcurrencyHelpers
import XCTest
import Dispatch
class ThreadTest: XCTestCase {
func testCurrentThreadWorks() throws {
let s = DispatchSemaphore(value: 0)
NIOThread.spawnAndRun { t in
XCTAssertTrue(t.isCurrent)
s.signal()
}
s.wait()
}
func testCurrentThreadIsNotTrueOnOtherThread() throws {
let s = DispatchSemaphore(value: 0)
NIOThread.spawnAndRun { t1 in
NIOThread.spawnAndRun { t2 in
XCTAssertFalse(t1.isCurrent)
XCTAssertTrue(t2.isCurrent)
s.signal()
}
}
s.wait()
}
func testThreadSpecificsAreNilWhenNotPresent() throws {
class SomeClass {}
let s = DispatchSemaphore(value: 0)
NIOThread.spawnAndRun { (_: NIO.NIOThread) in
let tsv: ThreadSpecificVariable<SomeClass> = ThreadSpecificVariable()
XCTAssertNil(tsv.currentValue)
s.signal()
}
s.wait()
}
func testThreadSpecificsWorks() throws {
class SomeClass {}
let s = DispatchSemaphore(value: 0)
NIOThread.spawnAndRun { (_: NIO.NIOThread) in
let tsv: ThreadSpecificVariable<SomeClass> = ThreadSpecificVariable()
XCTAssertNil(tsv.currentValue)
let expected = SomeClass()
tsv.currentValue = expected
XCTAssert(expected === tsv.currentValue)
s.signal()
}
s.wait()
}
func testThreadSpecificsAreNotAvailableOnADifferentThread() throws {
class SomeClass {}
let s = DispatchSemaphore(value: 0)
NIOThread.spawnAndRun { (_: NIO.NIOThread) in
let tsv = ThreadSpecificVariable<SomeClass>()
XCTAssertNil(tsv.currentValue)
tsv.currentValue = SomeClass()
XCTAssertNotNil(tsv.currentValue)
NIOThread.spawnAndRun { t2 in
XCTAssertNil(tsv.currentValue)
s.signal()
}
}
s.wait()
}
func testThreadSpecificDoesNotLeakIfThreadExitsWhilstSet() throws {
let s = DispatchSemaphore(value: 0)
class SomeClass {
let s: DispatchSemaphore
init(sem: DispatchSemaphore) { self.s = sem }
deinit {
s.signal()
}
}
weak var weakSome: SomeClass? = nil
NIOThread.spawnAndRun { (_: NIO.NIOThread) in
let some = SomeClass(sem: s)
weakSome = some
let tsv = ThreadSpecificVariable<SomeClass>()
tsv.currentValue = some
XCTAssertNotNil(tsv.currentValue)
}
s.wait()
XCTAssertNil(weakSome)
}
func testThreadSpecificDoesNotLeakIfThreadExitsAfterUnset() throws {
let s = DispatchSemaphore(value: 0)
class SomeClass {
let s: DispatchSemaphore
init(sem: DispatchSemaphore) { self.s = sem }
deinit {
s.signal()
}
}
weak var weakSome: SomeClass? = nil
NIOThread.spawnAndRun { (_: NIO.NIOThread) in
let some = SomeClass(sem: s)
weakSome = some
let tsv = ThreadSpecificVariable<SomeClass>()
tsv.currentValue = some
XCTAssertNotNil(tsv.currentValue)
tsv.currentValue = nil
}
s.wait()
XCTAssertNil(weakSome)
}
func testThreadSpecificDoesNotLeakIfReplacedWithNewValue() throws {
let s1 = DispatchSemaphore(value: 0)
let s2 = DispatchSemaphore(value: 0)
let s3 = DispatchSemaphore(value: 0)
class SomeClass {
let s: DispatchSemaphore
init(sem: DispatchSemaphore) { self.s = sem }
deinit {
s.signal()
}
}
weak var weakSome1: SomeClass? = nil
weak var weakSome2: SomeClass? = nil
weak var weakSome3: SomeClass? = nil
NIOThread.spawnAndRun { (_: NIO.NIOThread) in
let some1 = SomeClass(sem: s1)
weakSome1 = some1
let some2 = SomeClass(sem: s2)
weakSome2 = some2
let some3 = SomeClass(sem: s3)
weakSome3 = some3
let tsv = ThreadSpecificVariable<SomeClass>()
tsv.currentValue = some1
XCTAssertNotNil(tsv.currentValue)
tsv.currentValue = some2
XCTAssertNotNil(tsv.currentValue)
tsv.currentValue = some3
XCTAssertNotNil(tsv.currentValue)
}
s1.wait()
s2.wait()
s3.wait()
XCTAssertNil(weakSome1)
XCTAssertNil(weakSome2)
XCTAssertNil(weakSome3)
}
func testSharingThreadSpecificVariableWorks() throws {
let s = DispatchSemaphore(value: 0)
class SomeClass {
let s: DispatchSemaphore
init(sem: DispatchSemaphore) { self.s = sem }
deinit {
s.signal()
}
}
weak var weakSome: SomeClass? = nil
NIOThread.spawnAndRun { (_: NIO.NIOThread) in
let some = SomeClass(sem: s)
weakSome = some
let tsv = ThreadSpecificVariable<SomeClass>()
for _ in 0..<10 {
NIOThread.spawnAndRun { (_: NIO.NIOThread) in
tsv.currentValue = some
}
}
}
s.wait()
XCTAssertNil(weakSome)
}
func testThreadSpecificInitWithValueWorks() throws {
class SomeClass {}
let tsv = ThreadSpecificVariable(value: SomeClass())
XCTAssertNotNil(tsv.currentValue)
}
func testThreadSpecificDoesNotLeakWhenOutOfScopeButThreadStillRunning() throws {
let s = DispatchSemaphore(value: 0)
class SomeClass {
let s: DispatchSemaphore
init(sem: DispatchSemaphore) { self.s = sem }
deinit {
s.signal()
}
}
weak var weakSome: SomeClass? = nil
weak var weakTSV: ThreadSpecificVariable<SomeClass>? = nil
NIOThread.spawnAndRun { (_: NIOThread) in
{
let some = SomeClass(sem: s)
weakSome = some
let tsv = ThreadSpecificVariable<SomeClass>()
weakTSV = tsv
tsv.currentValue = some
XCTAssertNotNil(tsv.currentValue)
XCTAssertNotNil(weakTSV)
}()
}
s.wait()
assert(weakSome == nil, within: .seconds(1))
assert(weakTSV == nil, within: .seconds(1))
}
func testThreadSpecificDoesNotLeakIfThreadExitsWhilstSetOnMultipleThreads() throws {
let numberOfThreads = 6
let s = DispatchSemaphore(value: 0)
class SomeClass {
let s: DispatchSemaphore
init(sem: DispatchSemaphore) { self.s = sem }
deinit {
s.signal()
}
}
for _ in 0..<numberOfThreads {
NIOThread.spawnAndRun { (_: NIOThread) in
let some = SomeClass(sem: s)
let tsv = ThreadSpecificVariable<SomeClass>()
tsv.currentValue = some
XCTAssertNotNil(tsv.currentValue)
}
}
let timeout: DispatchTime = .now() + .seconds(1)
for _ in 0..<numberOfThreads {
switch s.wait(timeout: timeout) {
case .success:
()
case .timedOut:
XCTFail("timed out")
}
}
}
func testThreadSpecificDoesNotLeakWhenOutOfScopeButSetOnMultipleThreads() throws {
let t1Sem = DispatchSemaphore(value: 0)
let t2Sem = DispatchSemaphore(value: 0)
class SomeClass {
let s: DispatchSemaphore
init(sem: DispatchSemaphore) { self.s = sem }
deinit {
s.signal()
}
}
var globalTSVs: [ThreadSpecificVariable<SomeClass>] = []
let globalTSVLock = Lock()
({
let tsv = ThreadSpecificVariable<SomeClass>()
globalTSVLock.withLock {
globalTSVs.append(tsv)
globalTSVs.append(tsv)
}
})()
weak var weakSome1: SomeClass? = nil
weak var weakSome2: SomeClass? = nil
weak var weakTSV: ThreadSpecificVariable<SomeClass>? = nil
NIOThread.spawnAndRun { (_: NIOThread) in
{
let some = SomeClass(sem: t1Sem)
weakSome1 = some
var tsv: ThreadSpecificVariable<SomeClass>!
globalTSVLock.withLock {
tsv = globalTSVs.removeFirst()
}
weakTSV = tsv
tsv.currentValue = some
XCTAssertNotNil(tsv.currentValue)
XCTAssertNotNil(weakTSV)
}()
}
NIOThread.spawnAndRun { (_: NIOThread) in
{
let some = SomeClass(sem: t2Sem)
weakSome2 = some
var tsv: ThreadSpecificVariable<SomeClass>!
globalTSVLock.withLock {
tsv = globalTSVs.removeFirst()
}
weakTSV = tsv
tsv.currentValue = some
XCTAssertNotNil(tsv.currentValue)
XCTAssertNotNil(weakTSV)
}()
}
t2Sem.wait() /* wait on the other thread's `some` deallocation */
assert(weakSome1 == nil, within: .seconds(1))
assert(weakTSV == nil, within: .seconds(1))
t1Sem.wait() /* wait on the other thread's `some` deallocation */
assert(weakSome2 == nil, within: .seconds(1))
assert(weakTSV == nil, within: .seconds(1))
}
}
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