├── .gitignore
├── MultiThreading.xcodeproj
├── xcuserdata
│ └── gfx.xcuserdatad
│ │ └── xcschemes
│ │ ├── xcschememanagement.plist
│ │ └── MultiThreading.xcscheme
└── project.pbxproj
├── MultiThreadingTests
├── Info.plist
└── MultiThreadingTests.swift
├── README.md
└── MultiThreading
├── Images.xcassets
└── AppIcon.appiconset
│ └── Contents.json
├── Base.lproj
├── Main.storyboard
└── LaunchScreen.xib
├── Info.plist
├── AppDelegate.swift
└── ViewController.swift
/.gitignore:
--------------------------------------------------------------------------------
1 | *~
2 | *.swp
3 | xcuserdata/
4 |
--------------------------------------------------------------------------------
/MultiThreading.xcodeproj/xcuserdata/gfx.xcuserdatad/xcschemes/xcschememanagement.plist:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 | SchemeUserState
6 |
7 | MultiThreading.xcscheme
8 |
9 | orderHint
10 | 0
11 |
12 |
13 | SuppressBuildableAutocreation
14 |
15 | FABC39491AB651F100C7765D
16 |
17 | primary
18 |
19 |
20 | FABC395E1AB651F100C7765D
21 |
22 | primary
23 |
24 |
25 |
26 |
27 |
28 |
--------------------------------------------------------------------------------
/MultiThreadingTests/Info.plist:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 | CFBundleDevelopmentRegion
6 | en
7 | CFBundleExecutable
8 | $(EXECUTABLE_NAME)
9 | CFBundleIdentifier
10 | $(PRODUCT_BUNDLE_IDENTIFIER)
11 | CFBundleInfoDictionaryVersion
12 | 6.0
13 | CFBundleName
14 | $(PRODUCT_NAME)
15 | CFBundlePackageType
16 | BNDL
17 | CFBundleShortVersionString
18 | 1.0
19 | CFBundleSignature
20 | ????
21 | CFBundleVersion
22 | 1
23 |
24 |
25 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # Synchronization in Swift
2 |
3 | Swift has no synchornozation functionality in the language,
4 | but Foundation framework is available to synchronize the code.
5 |
6 | ## Use of `dispatch_sync()`
7 |
8 | ```swift
9 | class Foo {
10 | var value = 0
11 | let sync = dispatch_queue_create("\(self.dynamicType).sync", DISPATCH_QUEUE_SERIAL)
12 |
13 | func incrementWithSerialQueue() {
14 | dispatch_sync(sync) {
15 | self.value += 1
16 | }
17 | }
18 |
19 | ```
20 |
21 | ## Use of `objc_sync_enter()` and `objc_sync_exit()`
22 |
23 | ```swift
24 | class AutoSync {
25 | let object : AnyObject
26 |
27 | init(_ obj : AnyObject) {
28 | object = obj
29 | objc_sync_enter(object)
30 | }
31 |
32 | deinit {
33 | objc_sync_exit(object)
34 | }
35 | }
36 |
37 | class Foo {
38 | var value = 0
39 |
40 | func incrementWithObjcSync() {
41 | let lock = AutoSync(self)
42 | self.value += 1
43 | }
44 | }
45 | ```
46 |
--------------------------------------------------------------------------------
/MultiThreadingTests/MultiThreadingTests.swift:
--------------------------------------------------------------------------------
1 | //
2 | // MultiThreadingTests.swift
3 | // MultiThreadingTests
4 | //
5 | // Created by Fuji Goro on 2015/03/16.
6 | // Copyright (c) 2015年 FUJI Goro. All rights reserved.
7 | //
8 |
9 | import UIKit
10 | import XCTest
11 |
12 | class MultiThreadingTests: XCTestCase {
13 |
14 | override func setUp() {
15 | super.setUp()
16 | // Put setup code here. This method is called before the invocation of each test method in the class.
17 | }
18 |
19 | override func tearDown() {
20 | // Put teardown code here. This method is called after the invocation of each test method in the class.
21 | super.tearDown()
22 | }
23 |
24 | func testExample() {
25 | // This is an example of a functional test case.
26 | XCTAssert(true, "Pass")
27 | }
28 |
29 | func testPerformanceExample() {
30 | // This is an example of a performance test case.
31 | self.measureBlock() {
32 | // Put the code you want to measure the time of here.
33 | }
34 | }
35 |
36 | }
37 |
--------------------------------------------------------------------------------
/MultiThreading/Images.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
1 | {
2 | "images" : [
3 | {
4 | "idiom" : "iphone",
5 | "size" : "29x29",
6 | "scale" : "2x"
7 | },
8 | {
9 | "idiom" : "iphone",
10 | "size" : "29x29",
11 | "scale" : "3x"
12 | },
13 | {
14 | "idiom" : "iphone",
15 | "size" : "40x40",
16 | "scale" : "2x"
17 | },
18 | {
19 | "idiom" : "iphone",
20 | "size" : "40x40",
21 | "scale" : "3x"
22 | },
23 | {
24 | "idiom" : "iphone",
25 | "size" : "60x60",
26 | "scale" : "2x"
27 | },
28 | {
29 | "idiom" : "iphone",
30 | "size" : "60x60",
31 | "scale" : "3x"
32 | },
33 | {
34 | "idiom" : "ipad",
35 | "size" : "29x29",
36 | "scale" : "1x"
37 | },
38 | {
39 | "idiom" : "ipad",
40 | "size" : "29x29",
41 | "scale" : "2x"
42 | },
43 | {
44 | "idiom" : "ipad",
45 | "size" : "40x40",
46 | "scale" : "1x"
47 | },
48 | {
49 | "idiom" : "ipad",
50 | "size" : "40x40",
51 | "scale" : "2x"
52 | },
53 | {
54 | "idiom" : "ipad",
55 | "size" : "76x76",
56 | "scale" : "1x"
57 | },
58 | {
59 | "idiom" : "ipad",
60 | "size" : "76x76",
61 | "scale" : "2x"
62 | }
63 | ],
64 | "info" : {
65 | "version" : 1,
66 | "author" : "xcode"
67 | }
68 | }
--------------------------------------------------------------------------------
/MultiThreading/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
1 |
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26 |
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/MultiThreading/Info.plist:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 | CFBundleDevelopmentRegion
6 | en
7 | CFBundleExecutable
8 | $(EXECUTABLE_NAME)
9 | CFBundleIdentifier
10 | $(PRODUCT_BUNDLE_IDENTIFIER)
11 | CFBundleInfoDictionaryVersion
12 | 6.0
13 | CFBundleName
14 | $(PRODUCT_NAME)
15 | CFBundlePackageType
16 | APPL
17 | CFBundleShortVersionString
18 | 1.0
19 | CFBundleSignature
20 | ????
21 | CFBundleVersion
22 | 1
23 | LSRequiresIPhoneOS
24 |
25 | UILaunchStoryboardName
26 | LaunchScreen
27 | UIMainStoryboardFile
28 | Main
29 | UIRequiredDeviceCapabilities
30 |
31 | armv7
32 |
33 | UISupportedInterfaceOrientations
34 |
35 | UIInterfaceOrientationPortrait
36 | UIInterfaceOrientationLandscapeLeft
37 | UIInterfaceOrientationLandscapeRight
38 |
39 | UISupportedInterfaceOrientations~ipad
40 |
41 | UIInterfaceOrientationPortrait
42 | UIInterfaceOrientationPortraitUpsideDown
43 | UIInterfaceOrientationLandscapeLeft
44 | UIInterfaceOrientationLandscapeRight
45 |
46 |
47 |
48 |
--------------------------------------------------------------------------------
/MultiThreading/AppDelegate.swift:
--------------------------------------------------------------------------------
1 | //
2 | // AppDelegate.swift
3 | // MultiThreading
4 | //
5 | // Created by Fuji Goro on 2015/03/16.
6 | // Copyright (c) 2015年 FUJI Goro. All rights reserved.
7 | //
8 |
9 | import UIKit
10 |
11 | @UIApplicationMain
12 | class AppDelegate: UIResponder, UIApplicationDelegate {
13 |
14 | var window: UIWindow?
15 |
16 |
17 | func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
18 | // Override point for customization after application launch.
19 | return true
20 | }
21 |
22 | func applicationWillResignActive(application: UIApplication) {
23 | // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
24 | // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
25 | }
26 |
27 | func applicationDidEnterBackground(application: UIApplication) {
28 | // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
29 | // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
30 | }
31 |
32 | func applicationWillEnterForeground(application: UIApplication) {
33 | // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
34 | }
35 |
36 | func applicationDidBecomeActive(application: UIApplication) {
37 | // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
38 | }
39 |
40 | func applicationWillTerminate(application: UIApplication) {
41 | // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
42 | }
43 |
44 |
45 | }
46 |
47 |
--------------------------------------------------------------------------------
/MultiThreading/Base.lproj/LaunchScreen.xib:
--------------------------------------------------------------------------------
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
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26 |
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28 |
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30 |
31 |
32 |
33 |
34 |
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39 |
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41 |
42 |
--------------------------------------------------------------------------------
/MultiThreading/ViewController.swift:
--------------------------------------------------------------------------------
1 | //
2 | // ViewController.swift
3 | // MultiThreading
4 | //
5 | // Created by Fuji Goro on 2014/07/23.
6 | // Copyright (c) 2014年 FUJI Goro. All rights reserved.
7 | //
8 |
9 | import UIKit
10 |
11 | class ViewController: UIViewController {
12 | let N = 100_000
13 |
14 | var c1 = dispatch_queue_create("concurrent.1", DISPATCH_QUEUE_CONCURRENT)
15 | var c2 = dispatch_queue_create("concurrent.2", DISPATCH_QUEUE_CONCURRENT)
16 |
17 | let sync = dispatch_queue_create("\(self.dynamicType).sync", DISPATCH_QUEUE_SERIAL)
18 |
19 | var value : Int = 0;
20 |
21 | var t0 = NSDate().timeIntervalSince1970
22 |
23 | override func viewWillAppear(animated: Bool) {
24 | super.viewWillAppear(animated)
25 |
26 |
27 | let interval = dispatch_time(DISPATCH_TIME_NOW, Int64(2 * NSEC_PER_SEC))
28 | dispatch_after(interval, dispatch_get_main_queue()) {
29 | self.useObjcSync()
30 | }
31 | }
32 |
33 | func useObjcSync() {
34 | NSLog("start with objc_sync_enter")
35 |
36 | t0 = NSDate().timeIntervalSince1970
37 |
38 | dispatch_async(c1) {
39 | for _ in 0 ..< self.N {
40 | self.incrementWithObjcSync()
41 | }
42 |
43 | self.next()
44 | }
45 |
46 | dispatch_async(c2) {
47 | for _ in 0 ..< self.N {
48 | self.incrementWithObjcSync()
49 | }
50 |
51 | self.next()
52 | }
53 | }
54 |
55 | func useSerialQueue() {
56 | NSLog("start with serial queue")
57 | t0 = NSDate().timeIntervalSince1970
58 |
59 | dispatch_async(c1) {
60 | for _ in 0 ..< self.N {
61 | self.incrementWithSerialQueue()
62 | }
63 |
64 | self.finished()
65 | }
66 |
67 | dispatch_async(c2) {
68 | for _ in 0 ..< self.N {
69 | self.incrementWithSerialQueue()
70 | }
71 |
72 | self.finished()
73 | }
74 | }
75 |
76 | class AutoSync {
77 | let object : AnyObject
78 |
79 | init(_ obj : AnyObject) {
80 | object = obj
81 | objc_sync_enter(object)
82 | }
83 |
84 | deinit {
85 | objc_sync_exit(object)
86 | }
87 | }
88 |
89 | func incrementWithObjcSync() {
90 | // XXX: do not rename "lock" to "_", which seems to make it no-op
91 | let lock = AutoSync(self)
92 | self.value += 1
93 | }
94 |
95 | func incrementWithSerialQueue() {
96 | dispatch_sync(sync) {
97 | self.value += 1
98 | }
99 | }
100 |
101 | func next() {
102 | struct _Next {
103 | static var count = 0
104 | }
105 |
106 | if ++_Next.count >= 2 {
107 | NSLog("elapsed: %.03f sec.", NSDate().timeIntervalSince1970 - t0)
108 | useSerialQueue()
109 | }
110 | }
111 |
112 | func finished() {
113 | struct _Finished {
114 | static var count = 0
115 | }
116 |
117 | if ++_Finished.count >= 2 {
118 | NSLog("elapsed: %.03f sec.", NSDate().timeIntervalSince1970 - t0)
119 |
120 | let interval = dispatch_time(DISPATCH_TIME_NOW, Int64(1 * NSEC_PER_SEC))
121 | dispatch_after(interval, dispatch_get_main_queue()) {
122 | self.show(String(format: "value = %d", self.value))
123 | }
124 | }
125 | }
126 |
127 | func show(message : String) {
128 | NSLog("finished %@", message);
129 | let alert = UIAlertView(title: "Finished", message: message, delegate: nil, cancelButtonTitle: "OK")
130 | alert.show()
131 | }
132 | }
133 |
134 |
--------------------------------------------------------------------------------
/MultiThreading.xcodeproj/xcuserdata/gfx.xcuserdatad/xcschemes/MultiThreading.xcscheme:
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
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