├── YSC-GCD-demo ├── YSC-GCD-demo.xcodeproj │ ├── project.xcworkspace │ │ ├── contents.xcworkspacedata │ │ └── xcshareddata │ │ │ └── IDEWorkspaceChecks.plist │ └── project.pbxproj ├── YSC-GCD-demo │ ├── ViewController.h │ ├── AppDelegate.h │ ├── main.m │ ├── Info.plist │ ├── Base.lproj │ │ ├── Main.storyboard │ │ └── LaunchScreen.storyboard │ ├── Assets.xcassets │ │ └── AppIcon.appiconset │ │ │ └── Contents.json │ ├── AppDelegate.m │ └── ViewController.m ├── YSC-GCD-demoTests │ ├── Info.plist │ └── YSC_GCD_demoTests.m └── YSC-GCD-demoUITests │ ├── Info.plist │ └── YSC_GCD_demoUITests.m ├── .gitignore └── LICENSE /YSC-GCD-demo/YSC-GCD-demo.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demo/ViewController.h: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.h 3 | // YSC-GCD-demo 4 | // 5 | // Created by Walking Boy on 2018/2/13. 6 | // Copyright © 2018年 Walking Boy. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface ViewController : UIViewController 12 | 13 | 14 | @end 15 | 16 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demo.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | IDEDidComputeMac32BitWarning 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demo/AppDelegate.h: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.h 3 | // YSC-GCD-demo 4 | // 5 | // Created by Walking Boy on 2018/2/13. 6 | // Copyright © 2018年 Walking Boy. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface AppDelegate : UIResponder 12 | 13 | @property (strong, nonatomic) UIWindow *window; 14 | 15 | 16 | @end 17 | 18 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demo/main.m: -------------------------------------------------------------------------------- 1 | // 2 | // main.m 3 | // YSC-GCD-demo 4 | // 5 | // Created by Walking Boy on 2018/2/13. 6 | // Copyright © 2018年 Walking Boy. All rights reserved. 7 | // 8 | 9 | #import 10 | #import "AppDelegate.h" 11 | 12 | int main(int argc, char * argv[]) { 13 | @autoreleasepool { 14 | return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demoTests/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | $(DEVELOPMENT_LANGUAGE) 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 | CFBundleVersion 20 | 1 21 | 22 | 23 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demoUITests/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | $(DEVELOPMENT_LANGUAGE) 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 | CFBundleVersion 20 | 1 21 | 22 | 23 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demoTests/YSC_GCD_demoTests.m: -------------------------------------------------------------------------------- 1 | // 2 | // YSC_GCD_demoTests.m 3 | // YSC-GCD-demoTests 4 | // 5 | // Created by Walking Boy on 2018/2/13. 6 | // Copyright © 2018年 Walking Boy. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface YSC_GCD_demoTests : XCTestCase 12 | 13 | @end 14 | 15 | @implementation YSC_GCD_demoTests 16 | 17 | - (void)setUp { 18 | [super setUp]; 19 | // Put setup code here. This method is called before the invocation of each test method in the class. 20 | } 21 | 22 | - (void)tearDown { 23 | // Put teardown code here. This method is called after the invocation of each test method in the class. 24 | [super tearDown]; 25 | } 26 | 27 | - (void)testExample { 28 | // This is an example of a functional test case. 29 | // Use XCTAssert and related functions to verify your tests produce the correct results. 30 | } 31 | 32 | - (void)testPerformanceExample { 33 | // This is an example of a performance test case. 34 | [self measureBlock:^{ 35 | // Put the code you want to measure the time of here. 36 | }]; 37 | } 38 | 39 | @end 40 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demoUITests/YSC_GCD_demoUITests.m: -------------------------------------------------------------------------------- 1 | // 2 | // YSC_GCD_demoUITests.m 3 | // YSC-GCD-demoUITests 4 | // 5 | // Created by Walking Boy on 2018/2/13. 6 | // Copyright © 2018年 Walking Boy. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | @interface YSC_GCD_demoUITests : XCTestCase 12 | 13 | @end 14 | 15 | @implementation YSC_GCD_demoUITests 16 | 17 | - (void)setUp { 18 | [super setUp]; 19 | 20 | // Put setup code here. This method is called before the invocation of each test method in the class. 21 | 22 | // In UI tests it is usually best to stop immediately when a failure occurs. 23 | self.continueAfterFailure = NO; 24 | // UI tests must launch the application that they test. Doing this in setup will make sure it happens for each test method. 25 | [[[XCUIApplication alloc] init] launch]; 26 | 27 | // In UI tests it’s important to set the initial state - such as interface orientation - required for your tests before they run. The setUp method is a good place to do this. 28 | } 29 | 30 | - (void)tearDown { 31 | // Put teardown code here. This method is called after the invocation of each test method in the class. 32 | [super tearDown]; 33 | } 34 | 35 | - (void)testExample { 36 | // Use recording to get started writing UI tests. 37 | // Use XCTAssert and related functions to verify your tests produce the correct results. 38 | } 39 | 40 | @end 41 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Xcode 2 | # 3 | # gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore 4 | 5 | ## Build generated 6 | build/ 7 | DerivedData/ 8 | 9 | ## Various settings 10 | *.pbxuser 11 | !default.pbxuser 12 | *.mode1v3 13 | !default.mode1v3 14 | *.mode2v3 15 | !default.mode2v3 16 | *.perspectivev3 17 | !default.perspectivev3 18 | xcuserdata/ 19 | 20 | ## Other 21 | *.moved-aside 22 | *.xccheckout 23 | *.xcscmblueprint 24 | 25 | ## Obj-C/Swift specific 26 | *.hmap 27 | *.ipa 28 | *.dSYM.zip 29 | *.dSYM 30 | 31 | # CocoaPods 32 | # 33 | # We recommend against adding the Pods directory to your .gitignore. However 34 | # you should judge for yourself, the pros and cons are mentioned at: 35 | # https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control 36 | # 37 | # Pods/ 38 | 39 | # Carthage 40 | # 41 | # Add this line if you want to avoid checking in source code from Carthage dependencies. 42 | # Carthage/Checkouts 43 | 44 | Carthage/Build 45 | 46 | # fastlane 47 | # 48 | # It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the 49 | # screenshots whenever they are needed. 50 | # For more information about the recommended setup visit: 51 | # https://docs.fastlane.tools/best-practices/source-control/#source-control 52 | 53 | fastlane/report.xml 54 | fastlane/Preview.html 55 | fastlane/screenshots 56 | fastlane/test_output 57 | 58 | # Code Injection 59 | # 60 | # After new code Injection tools there's a generated folder /iOSInjectionProject 61 | # https://github.com/johnno1962/injectionforxcode 62 | 63 | iOSInjectionProject/ 64 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demo/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | $(DEVELOPMENT_LANGUAGE) 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 | CFBundleVersion 20 | 1 21 | LSRequiresIPhoneOS 22 | 23 | UILaunchStoryboardName 24 | LaunchScreen 25 | UIMainStoryboardFile 26 | Main 27 | UIRequiredDeviceCapabilities 28 | 29 | armv7 30 | 31 | UISupportedInterfaceOrientations 32 | 33 | UIInterfaceOrientationPortrait 34 | UIInterfaceOrientationLandscapeLeft 35 | UIInterfaceOrientationLandscapeRight 36 | 37 | UISupportedInterfaceOrientations~ipad 38 | 39 | UIInterfaceOrientationPortrait 40 | UIInterfaceOrientationPortraitUpsideDown 41 | UIInterfaceOrientationLandscapeLeft 42 | UIInterfaceOrientationLandscapeRight 43 | 44 | 45 | 46 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demo/Base.lproj/Main.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demo/Base.lproj/LaunchScreen.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demo/Assets.xcassets/AppIcon.appiconset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "iphone", 5 | "size" : "20x20", 6 | "scale" : "2x" 7 | }, 8 | { 9 | "idiom" : "iphone", 10 | "size" : "20x20", 11 | "scale" : "3x" 12 | }, 13 | { 14 | "idiom" : "iphone", 15 | "size" : "29x29", 16 | "scale" : "2x" 17 | }, 18 | { 19 | "idiom" : "iphone", 20 | "size" : "29x29", 21 | "scale" : "3x" 22 | }, 23 | { 24 | "idiom" : "iphone", 25 | "size" : "40x40", 26 | "scale" : "2x" 27 | }, 28 | { 29 | "idiom" : "iphone", 30 | "size" : "40x40", 31 | "scale" : "3x" 32 | }, 33 | { 34 | "idiom" : "iphone", 35 | "size" : "60x60", 36 | "scale" : "2x" 37 | }, 38 | { 39 | "idiom" : "iphone", 40 | "size" : "60x60", 41 | "scale" : "3x" 42 | }, 43 | { 44 | "idiom" : "ipad", 45 | "size" : "20x20", 46 | "scale" : "1x" 47 | }, 48 | { 49 | "idiom" : "ipad", 50 | "size" : "20x20", 51 | "scale" : "2x" 52 | }, 53 | { 54 | "idiom" : "ipad", 55 | "size" : "29x29", 56 | "scale" : "1x" 57 | }, 58 | { 59 | "idiom" : "ipad", 60 | "size" : "29x29", 61 | "scale" : "2x" 62 | }, 63 | { 64 | "idiom" : "ipad", 65 | "size" : "40x40", 66 | "scale" : "1x" 67 | }, 68 | { 69 | "idiom" : "ipad", 70 | "size" : "40x40", 71 | "scale" : "2x" 72 | }, 73 | { 74 | "idiom" : "ipad", 75 | "size" : "76x76", 76 | "scale" : "1x" 77 | }, 78 | { 79 | "idiom" : "ipad", 80 | "size" : "76x76", 81 | "scale" : "2x" 82 | }, 83 | { 84 | "idiom" : "ipad", 85 | "size" : "83.5x83.5", 86 | "scale" : "2x" 87 | } 88 | ], 89 | "info" : { 90 | "version" : 1, 91 | "author" : "xcode" 92 | } 93 | } -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demo/AppDelegate.m: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.m 3 | // YSC-GCD-demo 4 | // 5 | // Created by Walking Boy on 2018/2/13. 6 | // Copyright © 2018年 Walking Boy. All rights reserved. 7 | // 8 | 9 | #import "AppDelegate.h" 10 | 11 | @interface AppDelegate () 12 | 13 | @end 14 | 15 | @implementation AppDelegate 16 | 17 | 18 | - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 19 | // Override point for customization after application launch. 20 | return YES; 21 | } 22 | 23 | 24 | - (void)applicationWillResignActive:(UIApplication *)application { 25 | // 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. 26 | // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game. 27 | } 28 | 29 | 30 | - (void)applicationDidEnterBackground:(UIApplication *)application { 31 | // 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. 32 | // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. 33 | } 34 | 35 | 36 | - (void)applicationWillEnterForeground:(UIApplication *)application { 37 | // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background. 38 | } 39 | 40 | 41 | - (void)applicationDidBecomeActive:(UIApplication *)application { 42 | // 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. 43 | } 44 | 45 | 46 | - (void)applicationWillTerminate:(UIApplication *)application { 47 | // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 48 | } 49 | 50 | 51 | @end 52 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demo/ViewController.m: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.m 3 | // YSC-GCD-demo 4 | // 5 | // Created by Walking Boy on 2018/2/13. 6 | // Copyright © 2018年 Walking Boy. All rights reserved. 7 | // 8 | 9 | #import "ViewController.h" 10 | 11 | @interface ViewController () 12 | 13 | /* 剩余火车票数 */ 14 | @property (nonatomic, assign) int ticketSurplusCount; 15 | 16 | @end 17 | 18 | @implementation ViewController 19 | { 20 | dispatch_semaphore_t semaphoreLock; 21 | } 22 | 23 | - (void)viewDidLoad { 24 | [super viewDidLoad]; 25 | 26 | /* 任务+队列 相关方法 */ 27 | 28 | // 同步执行 + 并发队列 29 | // [self syncConcurrent]; 30 | 31 | // 异步执行 + 并发队列 32 | // [self asyncConcurrent]; 33 | 34 | // 同步执行 + 串行队列 35 | // [self syncSerial]; 36 | 37 | // 异步执行 + 串行队列 38 | // [self asyncSerial]; 39 | 40 | // 同步执行 + 主队列（主线程调用） 41 | // [self syncMain]; 42 | 43 | // 同步执行 + 主队列（其他线程调用） 44 | // [NSThread detachNewThreadSelector:@selector(syncMain) toTarget:self withObject:nil]; 45 | 46 | // 异步执行 + 主队列 47 | // [self asyncMain]; 48 | 49 | /* GCD 线程间通信 */ 50 | 51 | // [self communication]; 52 | 53 | 54 | /* GCD 其他方法 */ 55 | 56 | // 栅栏方法 dispatch_barrier_async 57 | // [self barrier]; 58 | 59 | // 延时执行方法 dispatch_after 60 | // [self after]; 61 | 62 | // 一次性代码（只执行一次）dispatch_once 63 | // [self once]; 64 | 65 | // 快速迭代方法 dispatch_apply 66 | // [self apply]; 67 | 68 | /* 队列组 gropu */ 69 | // 队列组 dispatch_group_notify 70 | // [self groupNotify]; 71 | 72 | // 队列组 dispatch_group_wait 73 | // [self groupWait]; 74 | 75 | // 队列组 dispatch_group_enter、dispatch_group_leave 76 | // [self groupEnterAndLeave]; 77 | 78 | /* 信号量 dispatch_semaphore */ 79 | // semaphore 线程同步 80 | // [self semaphoreSync]; 81 | 82 | // semaphore 线程安全 83 | // 非线程安全：不使用 semaphore 84 | // [self initTicketStatusNotSave]; 85 | 86 | // 线程安全：使用 semaphore 加锁 87 | // [self initTicketStatusSave]; 88 | } 89 | 90 | 91 | #pragma mark - 任务+队列 相关方法 92 | 93 | /** 94 | * 同步执行 + 并发队列 95 | * 特点：在当前线程中执行任务，不会开启新线程，执行完一个任务，再执行下一个任务。 96 | */ 97 | - (void)syncConcurrent { 98 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 99 | NSLog(@"syncConcurrent---begin"); 100 | 101 | dispatch_queue_t queue = dispatch_queue_create("net.bujige.testQueue", DISPATCH_QUEUE_CONCURRENT); 102 | 103 | dispatch_sync(queue, ^{ 104 | // 追加任务 1 105 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 106 | NSLog(@"1---%@",[NSThread currentThread]); // 打印当前线程 107 | }); 108 | 109 | dispatch_sync(queue, ^{ 110 | // 追加任务 2 111 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 112 | NSLog(@"2---%@",[NSThread currentThread]); // 打印当前线程 113 | }); 114 | 115 | dispatch_sync(queue, ^{ 116 | // 追加任务 3 117 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 118 | NSLog(@"3---%@",[NSThread currentThread]); // 打印当前线程 119 | }); 120 | 121 | NSLog(@"syncConcurrent---end"); 122 | } 123 | 124 | /** 125 | * 异步执行 + 并发队列 126 | * 特点：可以开启多个线程，任务交替（同时）执行。 127 | */ 128 | - (void)asyncConcurrent { 129 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 130 | NSLog(@"asyncConcurrent---begin"); 131 | 132 | dispatch_queue_t queue = dispatch_queue_create("net.bujige.testQueue", DISPATCH_QUEUE_CONCURRENT); 133 | 134 | dispatch_async(queue, ^{ 135 | // 追加任务 1 136 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 137 | NSLog(@"1---%@",[NSThread currentThread]); // 打印当前线程 138 | }); 139 | 140 | dispatch_async(queue, ^{ 141 | // 追加任务 2 142 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 143 | NSLog(@"2---%@",[NSThread currentThread]); // 打印当前线程 144 | }); 145 | 146 | dispatch_async(queue, ^{ 147 | // 追加任务 3 148 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 149 | NSLog(@"3---%@",[NSThread currentThread]); // 打印当前线程 150 | }); 151 | 152 | NSLog(@"asyncConcurrent---end"); 153 | } 154 | 155 | /** 156 | * 同步执行 + 串行队列 157 | * 特点：不会开启新线程，在当前线程执行任务。任务是串行的，执行完一个任务，再执行下一个任务。 158 | */ 159 | - (void)syncSerial { 160 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 161 | NSLog(@"syncSerial---begin"); 162 | 163 | dispatch_queue_t queue = dispatch_queue_create("net.bujige.testQueue", DISPATCH_QUEUE_SERIAL); 164 | 165 | dispatch_sync(queue, ^{ 166 | // 追加任务 1 167 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 168 | NSLog(@"1---%@",[NSThread currentThread]); // 打印当前线程 169 | }); 170 | dispatch_sync(queue, ^{ 171 | // 追加任务 2 172 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 173 | NSLog(@"2---%@",[NSThread currentThread]); // 打印当前线程 174 | }); 175 | dispatch_sync(queue, ^{ 176 | // 追加任务 3 177 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 178 | NSLog(@"3---%@",[NSThread currentThread]); // 打印当前线程 179 | }); 180 | 181 | NSLog(@"syncSerial---end"); 182 | } 183 | 184 | /** 185 | * 异步执行 + 串行队列 186 | * 特点：会开启新线程，但是因为任务是串行的，执行完一个任务，再执行下一个任务。 187 | */ 188 | - (void)asyncSerial { 189 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 190 | NSLog(@"asyncSerial---begin"); 191 | 192 | dispatch_queue_t queue = dispatch_queue_create("net.bujige.testQueue", DISPATCH_QUEUE_SERIAL); 193 | 194 | dispatch_async(queue, ^{ 195 | // 追加任务 1 196 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 197 | NSLog(@"1---%@",[NSThread currentThread]); // 打印当前线程 198 | }); 199 | dispatch_async(queue, ^{ 200 | // 追加任务 2 201 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 202 | NSLog(@"2---%@",[NSThread currentThread]); // 打印当前线程 203 | }); 204 | dispatch_async(queue, ^{ 205 | // 追加任务 3 206 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 207 | NSLog(@"3---%@",[NSThread currentThread]); // 打印当前线程 208 | }); 209 | 210 | NSLog(@"asyncSerial---end"); 211 | } 212 | 213 | /** 214 | * 同步执行 + 主队列 215 | * 特点(主线程调用)：互等卡主不执行。 216 | * 特点(其他线程调用)：不会开启新线程，执行完一个任务，再执行下一个任务。 217 | */ 218 | - (void)syncMain { 219 | 220 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 221 | NSLog(@"syncMain---begin"); 222 | 223 | dispatch_queue_t queue = dispatch_get_main_queue(); 224 | 225 | dispatch_sync(queue, ^{ 226 | // 追加任务 1 227 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 228 | NSLog(@"1---%@",[NSThread currentThread]); // 打印当前线程 229 | }); 230 | 231 | dispatch_sync(queue, ^{ 232 | // 追加任务 2 233 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 234 | NSLog(@"2---%@",[NSThread currentThread]); // 打印当前线程 235 | }); 236 | 237 | dispatch_sync(queue, ^{ 238 | // 追加任务 3 239 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 240 | NSLog(@"3---%@",[NSThread currentThread]); // 打印当前线程 241 | }); 242 | 243 | NSLog(@"syncMain---end"); 244 | } 245 | 246 | /** 247 | * 异步执行 + 主队列 248 | * 特点：只在主线程中执行任务，执行完一个任务，再执行下一个任务 249 | */ 250 | - (void)asyncMain { 251 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 252 | NSLog(@"asyncMain---begin"); 253 | 254 | dispatch_queue_t queue = dispatch_get_main_queue(); 255 | 256 | dispatch_async(queue, ^{ 257 | // 追加任务 1 258 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 259 | NSLog(@"1---%@",[NSThread currentThread]); // 打印当前线程 260 | }); 261 | 262 | dispatch_async(queue, ^{ 263 | // 追加任务 2 264 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 265 | NSLog(@"2---%@",[NSThread currentThread]); // 打印当前线程 266 | }); 267 | 268 | dispatch_async(queue, ^{ 269 | // 追加任务 3 270 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 271 | NSLog(@"3---%@",[NSThread currentThread]); // 打印当前线程 272 | }); 273 | 274 | NSLog(@"asyncMain---end"); 275 | } 276 | 277 | 278 | #pragma mark - 线程间通信 279 | 280 | /** 281 | * 线程间通信 282 | */ 283 | - (void)communication { 284 | // 获取全局并发队列 285 | dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); 286 | // 获取主队列 287 | dispatch_queue_t mainQueue = dispatch_get_main_queue(); 288 | 289 | dispatch_async(queue, ^{ 290 | // 异步追加任务 1 291 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 292 | NSLog(@"1---%@",[NSThread currentThread]); // 打印当前线程 293 | 294 | // 回到主线程 295 | dispatch_async(mainQueue, ^{ 296 | // 追加在主线程中执行的任务 297 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 298 | NSLog(@"2---%@",[NSThread currentThread]); // 打印当前线程 299 | }); 300 | }); 301 | } 302 | 303 | 304 | #pragma mark - GCD 其他相关方法 305 | 306 | /** 307 | * 栅栏方法 dispatch_barrier_async 308 | */ 309 | - (void)barrier { 310 | dispatch_queue_t queue = dispatch_queue_create("net.bujige.testQueue", DISPATCH_QUEUE_CONCURRENT); 311 | 312 | dispatch_async(queue, ^{ 313 | // 追加任务 1 314 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 315 | NSLog(@"1---%@",[NSThread currentThread]); // 打印当前线程 316 | }); 317 | dispatch_async(queue, ^{ 318 | // 追加任务 2 319 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 320 | NSLog(@"2---%@",[NSThread currentThread]); // 打印当前线程 321 | }); 322 | 323 | dispatch_barrier_async(queue, ^{ 324 | // 追加任务 barrier 325 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 326 | NSLog(@"barrier---%@",[NSThread currentThread]);// 打印当前线程 327 | }); 328 | 329 | dispatch_async(queue, ^{ 330 | // 追加任务 3 331 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 332 | NSLog(@"3---%@",[NSThread currentThread]); // 打印当前线程 333 | }); 334 | dispatch_async(queue, ^{ 335 | // 追加任务 4 336 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 337 | NSLog(@"4---%@",[NSThread currentThread]); // 打印当前线程 338 | }); 339 | } 340 | 341 | /** 342 | * 延时执行方法 dispatch_after 343 | */ 344 | - (void)after { 345 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 346 | NSLog(@"asyncMain---begin"); 347 | 348 | dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ 349 | // 2.0 秒后异步追加任务代码到主队列，并开始执行 350 | NSLog(@"after---%@",[NSThread currentThread]); // 打印当前线程 351 | }); 352 | } 353 | 354 | /** 355 | * 一次性代码（只执行一次）dispatch_once 356 | */ 357 | - (void)once { 358 | static dispatch_once_t onceToken; 359 | dispatch_once(&onceToken, ^{ 360 | // 只执行 1 次的代码（这里面默认是线程安全的） 361 | }); 362 | } 363 | 364 | /** 365 | * 快速迭代方法 dispatch_apply 366 | */ 367 | - (void)apply { 368 | dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); 369 | 370 | NSLog(@"apply---begin"); 371 | dispatch_apply(6, queue, ^(size_t index) { 372 | NSLog(@"%zd---%@",index, [NSThread currentThread]); 373 | }); 374 | NSLog(@"apply---end"); 375 | } 376 | 377 | #pragma mark - dispatch_group 队列组 378 | 379 | /** 380 | * 队列组 dispatch_group_notify 381 | */ 382 | - (void)groupNotify { 383 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 384 | NSLog(@"group---begin"); 385 | 386 | dispatch_group_t group = dispatch_group_create(); 387 | 388 | dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 389 | // 追加任务 1 390 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 391 | NSLog(@"1---%@",[NSThread currentThread]); // 打印当前线程 392 | }); 393 | 394 | dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 395 | // 追加任务 2 396 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 397 | NSLog(@"2---%@",[NSThread currentThread]); // 打印当前线程 398 | }); 399 | 400 | dispatch_group_notify(group, dispatch_get_main_queue(), ^{ 401 | // 等前面的异步任务 1、任务 2 都执行完毕后，回到主线程执行下边任务 402 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 403 | NSLog(@"3---%@",[NSThread currentThread]); // 打印当前线程 404 | 405 | NSLog(@"group---end"); 406 | }); 407 | } 408 | 409 | /** 410 | * 队列组 dispatch_group_wait 411 | */ 412 | - (void)groupWait { 413 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 414 | NSLog(@"group---begin"); 415 | 416 | dispatch_group_t group = dispatch_group_create(); 417 | 418 | dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 419 | // 追加任务 1 420 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 421 | NSLog(@"1---%@",[NSThread currentThread]); // 打印当前线程 422 | }); 423 | 424 | dispatch_group_async(group, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ 425 | // 追加任务 2 426 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 427 | NSLog(@"2---%@",[NSThread currentThread]); // 打印当前线程 428 | }); 429 | 430 | // 等待上面的任务全部完成后，会往下继续执行（会阻塞当前线程） 431 | dispatch_group_wait(group, DISPATCH_TIME_FOREVER); 432 | 433 | NSLog(@"group---end"); 434 | 435 | } 436 | 437 | /** 438 | * 队列组 dispatch_group_enter、dispatch_group_leave 439 | */ 440 | - (void)groupEnterAndLeave { 441 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 442 | NSLog(@"group---begin"); 443 | 444 | dispatch_group_t group = dispatch_group_create(); 445 | dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); 446 | dispatch_group_enter(group); 447 | dispatch_async(queue, ^{ 448 | // 追加任务 1 449 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 450 | NSLog(@"1---%@",[NSThread currentThread]); // 打印当前线程 451 | 452 | dispatch_group_leave(group); 453 | }); 454 | 455 | dispatch_group_enter(group); 456 | dispatch_async(queue, ^{ 457 | // 追加任务 2 458 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 459 | NSLog(@"2---%@",[NSThread currentThread]); // 打印当前线程 460 | 461 | dispatch_group_leave(group); 462 | }); 463 | 464 | dispatch_group_notify(group, dispatch_get_main_queue(), ^{ 465 | // 等前面的异步操作都执行完毕后，回到主线程. 466 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 467 | NSLog(@"3---%@",[NSThread currentThread]); // 打印当前线程 468 | 469 | NSLog(@"group---end"); 470 | }); 471 | } 472 | 473 | #pragma mark - semaphore 线程同步 474 | 475 | /** 476 | * semaphore 线程同步 477 | */ 478 | - (void)semaphoreSync { 479 | 480 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 481 | NSLog(@"semaphore---begin"); 482 | 483 | dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); 484 | dispatch_semaphore_t semaphore = dispatch_semaphore_create(0); 485 | 486 | __block int number = 0; 487 | dispatch_async(queue, ^{ 488 | // 追加任务 1 489 | [NSThread sleepForTimeInterval:2]; // 模拟耗时操作 490 | NSLog(@"1---%@",[NSThread currentThread]); // 打印当前线程 491 | 492 | number = 100; 493 | 494 | dispatch_semaphore_signal(semaphore); 495 | }); 496 | 497 | dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER); 498 | NSLog(@"semaphore---end,number = %zd",number); 499 | } 500 | 501 | #pragma mark - semaphore 线程安全 502 | /** 503 | * 非线程安全：不使用 semaphore 504 | * 初始化火车票数量、卖票窗口（非线程安全）、并开始卖票 505 | */ 506 | - (void)initTicketStatusNotSave { 507 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 508 | NSLog(@"semaphore---begin"); 509 | 510 | self.ticketSurplusCount = 50; 511 | 512 | // queue1 代表北京火车票售卖窗口 513 | dispatch_queue_t queue1 = dispatch_queue_create("net.bujige.testQueue1", DISPATCH_QUEUE_SERIAL); 514 | // queue2 代表上海火车票售卖窗口 515 | dispatch_queue_t queue2 = dispatch_queue_create("net.bujige.testQueue2", DISPATCH_QUEUE_SERIAL); 516 | 517 | __weak typeof(self) weakSelf = self; 518 | dispatch_async(queue1, ^{ 519 | [weakSelf saleTicketNotSafe]; 520 | }); 521 | 522 | dispatch_async(queue2, ^{ 523 | [weakSelf saleTicketNotSafe]; 524 | }); 525 | } 526 | 527 | /** 528 | * 售卖火车票（非线程安全） 529 | */ 530 | - (void)saleTicketNotSafe { 531 | while (1) { 532 | 533 | if (self.ticketSurplusCount > 0) { //如果还有票，继续售卖 534 | self.ticketSurplusCount--; 535 | NSLog(@"%@", [NSString stringWithFormat:@"剩余票数：%d 窗口：%@", self.ticketSurplusCount, [NSThread currentThread]]); 536 | [NSThread sleepForTimeInterval:0.2]; 537 | } else { // 如果已卖完，关闭售票窗口 538 | NSLog(@"所有火车票均已售完"); 539 | break; 540 | } 541 | 542 | } 543 | } 544 | 545 | /** 546 | * 线程安全：使用 semaphore 加锁 547 | * 初始化火车票数量、卖票窗口（线程安全）、并开始卖票 548 | */ 549 | - (void)initTicketStatusSave { 550 | NSLog(@"currentThread---%@",[NSThread currentThread]); // 打印当前线程 551 | NSLog(@"semaphore---begin"); 552 | 553 | semaphoreLock = dispatch_semaphore_create(1); 554 | 555 | self.ticketSurplusCount = 50; 556 | 557 | // queue1 代表北京火车票售卖窗口 558 | dispatch_queue_t queue1 = dispatch_queue_create("net.bujige.testQueue1", DISPATCH_QUEUE_SERIAL); 559 | // queue2 代表上海火车票售卖窗口 560 | dispatch_queue_t queue2 = dispatch_queue_create("net.bujige.testQueue2", DISPATCH_QUEUE_SERIAL); 561 | 562 | __weak typeof(self) weakSelf = self; 563 | dispatch_async(queue1, ^{ 564 | [weakSelf saleTicketSafe]; 565 | }); 566 | 567 | dispatch_async(queue2, ^{ 568 | [weakSelf saleTicketSafe]; 569 | }); 570 | } 571 | 572 | /** 573 | * 售卖火车票（线程安全） 574 | */ 575 | - (void)saleTicketSafe { 576 | while (1) { 577 | // 相当于加锁 578 | dispatch_semaphore_wait(semaphoreLock, DISPATCH_TIME_FOREVER); 579 | 580 | if (self.ticketSurplusCount > 0) { // 如果还有票，继续售卖 581 | self.ticketSurplusCount--; 582 | NSLog(@"%@", [NSString stringWithFormat:@"剩余票数：%d 窗口：%@", self.ticketSurplusCount, [NSThread currentThread]]); 583 | [NSThread sleepForTimeInterval:0.2]; 584 | } else { // 如果已卖完，关闭售票窗口 585 | NSLog(@"所有火车票均已售完"); 586 | 587 | // 相当于解锁 588 | dispatch_semaphore_signal(semaphoreLock); 589 | break; 590 | } 591 | 592 | // 相当于解锁 593 | dispatch_semaphore_signal(semaphoreLock); 594 | } 595 | } 596 | 597 | @end 598 | -------------------------------------------------------------------------------- /YSC-GCD-demo/YSC-GCD-demo.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 4 | classes = { 5 | }; 6 | objectVersion = 48; 7 | objects = { 8 | 9 | /* Begin PBXBuildFile section */ 10 | 935724962032FFBC00850BC9 /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = 935724952032FFBC00850BC9 /* AppDelegate.m */; }; 11 | 935724992032FFBC00850BC9 /* ViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 935724982032FFBC00850BC9 /* ViewController.m */; }; 12 | 9357249C2032FFBC00850BC9 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; 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