//
// GCDViewController.m
// ObjcGoNew
//
// Created by 邢伟新 on 2021/4/15.
//
#import "GCDViewController.h"
#import
#import "BarrierViewController.h"
#import "OtherGCDViewController.h"
#import "GroupGCDViewController.h"
#import "SemaphoreViewController.h"
#import "LockViewController.h"
typedef void(^TestBlock)(void);
@interface GCDViewController ()
@end
@implementation GCDViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.title = @"GCD";
self.view.backgroundColor = [UIColor whiteColor];
//栅栏按钮按钮
UIButton *barrierButton = [UIButton buttonWithType:(UIButtonTypeCustom)];
[barrierButton setTitle:@"跳转栅栏函数" forState:(UIControlStateNormal)];
[barrierButton addTarget:self action:@selector(barrierAction:) forControlEvents:(UIControlEventTouchUpInside)];
barrierButton.backgroundColor =[UIColor purpleColor];
barrierButton.tag = 1001;
[self.view addSubview:barrierButton];
[barrierButton mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(15);
make.right.mas_equalTo(-15);
make.height.mas_equalTo(50);
make.top.mas_equalTo(150);
}];
//GCD其他操作
UIButton *afterButton = [UIButton buttonWithType:(UIButtonTypeCustom)];
[afterButton setTitle:@"GCD其他用法" forState:(UIControlStateNormal)];
afterButton.tag = 1002;
[afterButton addTarget:self action:@selector(barrierAction:) forControlEvents:(UIControlEventTouchUpInside)];
afterButton.backgroundColor =[UIColor purpleColor];
[self.view addSubview:afterButton];
[afterButton mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(15);
make.right.mas_equalTo(-15);
make.height.mas_equalTo(50);
make.top.equalTo(barrierButton.mas_bottom).offset(15);
}];
//Group
UIButton *GroupButton = [UIButton buttonWithType:(UIButtonTypeCustom)];
[GroupButton setTitle:@"GCD-Group" forState:(UIControlStateNormal)];
GroupButton.tag = 1003;
[GroupButton addTarget:self action:@selector(barrierAction:) forControlEvents:(UIControlEventTouchUpInside)];
GroupButton.backgroundColor =[UIColor purpleColor];
[self.view addSubview:GroupButton];
[GroupButton mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(15);
make.right.mas_equalTo(-15);
make.height.mas_equalTo(50);
make.top.equalTo(afterButton.mas_bottom).offset(15);
}];
//信号量
UIButton *semButton = [UIButton buttonWithType:(UIButtonTypeCustom)];
[semButton setTitle:@"信号量" forState:(UIControlStateNormal)];
[semButton addTarget:self action:@selector(barrierAction:) forControlEvents:(UIControlEventTouchUpInside)];
semButton.backgroundColor =[UIColor purpleColor];
semButton.tag = 1004;
[self.view addSubview:semButton];
[semButton mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(15);
make.right.mas_equalTo(-15);
make.height.mas_equalTo(50);
make.top.mas_equalTo(GroupButton.mas_bottom).offset(15);
}];
//锁
UIButton *lockButton = [UIButton buttonWithType:(UIButtonTypeCustom)];
[lockButton setTitle:@"锁" forState:(UIControlStateNormal)];
[lockButton addTarget:self action:@selector(barrierAction:) forControlEvents:(UIControlEventTouchUpInside)];
lockButton.backgroundColor =[UIColor purpleColor];
lockButton.tag = 1005;
[self.view addSubview:lockButton];
[lockButton mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.mas_equalTo(15);
make.right.mas_equalTo(-15);
make.height.mas_equalTo(50);
make.top.mas_equalTo(GroupButton.mas_bottom).offset(15);
}];
// [self gcdBlockCancel];
}
-(void)barrierAction:(UIButton *)btn{
if (btn.tag == 1001) {
BarrierViewController *b = [[BarrierViewController alloc]init];
[self.navigationController pushViewController:b animated:YES];
}
else if (btn.tag == 1002){
OtherGCDViewController *b = [[OtherGCDViewController alloc]init];
[self.navigationController pushViewController:b animated:YES];
}else if (btn.tag == 1003){
GroupGCDViewController *gc = [[GroupGCDViewController alloc]init];
[self.navigationController pushViewController:gc animated:YES];
}else if (btn.tag == 1004){
SemaphoreViewController *se = [[SemaphoreViewController alloc]init];
[self.navigationController pushViewController:se animated:YES];
}else if(btn.tag == 1005){
LockViewController *se = [[LockViewController alloc]init];
[self.navigationController pushViewController:se animated:YES];
}
}
//test10
-(void)test10{
// NSLog(@"1---%@",[NSThread currentThread]);
//
// dispatch_async(dispatch_get_global_queue(0, 0), ^{
//
// for (int i = 0; i < 6; i++) {
//
// [NSThread sleepForTimeInterval:2];
//
// NSLog(@"%d----%@",i,[NSThread currentThread]);
//
// }
//
//
// });
NSLog(@"1---%@",[NSThread currentThread]);
//创建信号量
dispatch_semaphore_t sem = dispatch_semaphore_create(1);
//创建队列
dispatch_queue_t queue = dispatch_get_global_queue(0, 0);
//创建组
dispatch_group_t group = dispatch_group_create();
NSMutableArray *mutaArray = [NSMutableArray array];
for (int i = 0; i < 6; i++) {
dispatch_group_async(group, queue, ^{
[NSThread sleepForTimeInterval:2];
dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
[mutaArray addObject:[NSNumber numberWithInt:i]];
NSLog(@"%d----%@",i,[NSThread currentThread]);
dispatch_semaphore_signal(sem);
});
}
dispatch_group_notify(group, queue, ^{
NSLog(@"数组为----%@---%@",mutaArray,[NSThread currentThread]);
});
}
//串行队列同步添加任务
-(void)test1{
//执行顺序为1 2 3 4 5 6,串行队列同步添加任务没有开启新线程,顺序执行
dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_SERIAL);
NSLog(@"1 ------- %@",[NSThread currentThread]);
dispatch_sync(queue, ^{
NSLog(@"2 ------- %@",[NSThread currentThread]);
});
dispatch_sync(queue, ^{
NSLog(@"3 ------- %@",[NSThread currentThread]);
});
dispatch_sync(queue, ^{
NSLog(@"4 ------- %@",[NSThread currentThread]);
});
dispatch_sync(queue, ^{
NSLog(@"5 ------- %@",[NSThread currentThread]);
});
NSLog(@"6 ------- %@",[NSThread currentThread]);
}
//并发队列,同步添加任务
-(void)test2{
//执行顺序1 2 3 4 5 6,并发队列同步添加任务,不开启新的线程,顺序执行.
dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_CONCURRENT);
NSLog(@"1 ------- %@",[NSThread currentThread]);
dispatch_sync(queue, ^{
NSLog(@"2 ------- %@",[NSThread currentThread]);
});
dispatch_sync(queue, ^{
NSLog(@"3 ------- %@",[NSThread currentThread]);
});
dispatch_sync(queue, ^{
NSLog(@"4 ------- %@",[NSThread currentThread]);
});
dispatch_sync(queue, ^{
NSLog(@"5 ------- %@",[NSThread currentThread]);
});
NSLog(@"6 ------- %@",[NSThread currentThread]);
}
//串行队列异步添加任务
-(void)test3{
// 执行顺序 1 6 2 3 4 5,开启了一个新的线程,新线程中添加的任务顺序执行
dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_SERIAL);
NSLog(@"1 ------- %@",[NSThread currentThread]);
dispatch_async(queue, ^{
NSLog(@"2 ------- %@",[NSThread currentThread]);
});
dispatch_async(queue, ^{
NSLog(@"3 ------- %@",[NSThread currentThread]);
});
dispatch_async(queue, ^{
NSLog(@"4 ------- %@",[NSThread currentThread]);
});
dispatch_async(queue, ^{
NSLog(@"5 ------- %@",[NSThread currentThread]);
});
NSLog(@"6 ------- %@",[NSThread currentThread]);
}
//并发队列中,异步添加任务
-(void)test4{
//执行顺序为1 6 2543,且2/3/4/5执行顺序不一定,开启了多条线程的.
dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_CONCURRENT);
NSLog(@"1 ------- %@",[NSThread currentThread]);
dispatch_async(queue, ^{
NSLog(@"2 ------- %@",[NSThread currentThread]);
});
dispatch_async(queue, ^{
NSLog(@"3 ------- %@",[NSThread currentThread]);
});
dispatch_async(queue, ^{
NSLog(@"4 ------- %@",[NSThread currentThread]);
});
dispatch_async(queue, ^{
NSLog(@"5 ------- %@",[NSThread currentThread]);
});
NSLog(@"6 ------- %@",[NSThread currentThread]);
}
//线程死锁
//情况一:主队列中同步添加任务
-(void)test5{
NSLog(@"1");
dispatch_sync(dispatch_get_main_queue(), ^{
NSLog(@"2");
});
NSLog(@"3");
}
//主队列中异步添加任务
-(void)test6{
//执行顺序为 1 3 2,且都是在主线程中.
NSLog(@"1 ------- %@",[NSThread currentThread]);
dispatch_async(dispatch_get_main_queue(), ^{
NSLog(@"2 ------- %@",[NSThread currentThread]);
});
NSLog(@"3 ------- %@",[NSThread currentThread]);
}
//串行队列,先异步添加任务,再同步添加任务
-(void)test7{
//1 4 2 崩溃
dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_SERIAL);
NSLog(@"1 ------- %@",[NSThread currentThread]);
dispatch_async(queue, ^{
NSLog(@"2 ------- %@",[NSThread currentThread]);
dispatch_sync(queue, ^{
NSLog(@"3 ------- %@",[NSThread currentThread]);
});
});
NSLog(@"4 ------- %@",[NSThread currentThread]);
}
//京东面试题
-(void)test8{
//1.加了__block修饰则输出 test1
//2.没加__block修饰则输出 test
@autoreleasepool {
// __block NSString *test = @"test";
NSString *test = @"test";
TestBlock block = ^{
dispatch_queue_t queue = dispatch_queue_create("com.hello.xwx", DISPATCH_QUEUE_SERIAL);
dispatch_sync(queue, ^{
NSLog(@"%@",test);
});
};
test = @"test1";
block();
}
}
//志东笔试题
-(void)test9{
/*
2021-04-15 15:08:44.848353+0800 ObjcGoNew[5106:273366] 1 ------- {number = 1, name = main}
2021-04-15 15:08:44.848560+0800 ObjcGoNew[5106:273366] 3 ------- {number = 1, name = main}
2021-04-15 15:08:44.848561+0800 ObjcGoNew[5106:273512] 2 ------- {number = 5, name = (null)}
2021-04-15 15:08:44.848823+0800 ObjcGoNew[5106:273366] 4 ------- {number = 1, name = main}
2021-04-15 15:08:44.848961+0800 ObjcGoNew[5106:273366] 5 ------- {number = 1, name = main}
*/
dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_SERIAL);
NSLog(@"1 ------- %@",[NSThread currentThread]);
dispatch_async(queue, ^{
NSLog(@"2 ------- %@",[NSThread currentThread]);
});
NSLog(@"3 ------- %@",[NSThread currentThread]);
dispatch_sync(queue, ^{
NSLog(@"4 ------- %@",[NSThread currentThread]);
});
NSLog(@"5 ------- %@",[NSThread currentThread]);
}
//任务取消
-(void)gcdBlockCancel{
dispatch_queue_t queue = dispatch_get_global_queue(0, 0);
dispatch_block_t block1 = dispatch_block_create(0, ^{
NSLog(@"1-----%@",[NSThread currentThread]);
});
dispatch_block_t block2 = dispatch_block_create(0, ^{
NSLog(@"2-----%@",[NSThread currentThread]);
});
dispatch_block_t block3 = dispatch_block_create(0, ^{
NSLog(@"3-----%@",[NSThread currentThread]);
});
dispatch_async(queue, block1);
dispatch_async(queue, block2);
dispatch_async(queue, block3);
//取消任务3
dispatch_block_cancel(block3);
}
@end
