并发队列：GCD默认提供了全局的并发队列，提供整个应用使用，可以无需手动创建
使用dispatch_get_global_queue函数获得全局的并发队列
dispatch_queue_t dispatch_get_global_queue()(
dispatch_queue_prioprity_t priority,//队列的优先级
unsigned long flags);//此参数暂时无用，用0即可
获得全局并发队列
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);
串行队列
GCD中获得串行队列有2中途径
使用dispatch_queue_create函数创建串行队列
//创建串行队列（队列里欸选哪个传递NULL或者DISPATCH_QUEUE_SERIAL）
dispatch_queue_t queue = dispatch_queue_create("com.queue",NULL);
使用主队列（跟线程相关联的队列）
放在主队列中的任务，都会放到主线程中执行
使用dispatch_get_main_queue()获得主队列
dispatch_queue_t queue = dispatch_get_main_queue();
//代码实现部分
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
[self asycConcurrent];
[self syncConcurrent];
[self asyncSerial];
[self syncSerial];
}
/*
同步函数 + 主队列(会发生阻塞)
*/
- (void)synMain{
NSLog(@"---------------begin");//只执行这一句
//获得主队列
dispatch_queue_t queue = dispatch_get_main_queue();
//将任务添加到队列中
dispatch_sync(queue,^{
NSLog(@"1-----%@",[NSThread currentThread]);
});
dispatch_sync(queue,^{
NSLog(@"2-----%@",[NSThread currentThread]);
});
dispatch_sync(queue,^{
NSLog(@"3-----%@",[NSThread currentThread]);
});
NSLog(@"---------------end");
}
/*
异步函数 + 主队列：只在主线程中执行任务
*/
- (void)asynMain{
//获得主队列
dispatch_queue_t queue = dispatch_get_main_queue();
//将任务添加到队列中
dispatch_async(queue,^{
NSLog(@"1-----%@",[NSThread currentThread]);
});
dispatch_async(queue,^{
NSLog(@"2-----%@",[NSThread currentThread]);
});
dispatch_async(queue,^{
NSLog(@"3-----%@",[NSThread currentThread]);
});
}
/*
同步函数+串行队列:不会开启新的线程，再当前线程执行任务，但是任务是串行的，执行完一个任务后，再执行下一个任务
*/
- (void)syncSerial{
//创建串行队列
dispatch_queue_t queue = dispatch_queue_create("com.queue",DISPATCH_QUEUE_SERIAL);
//2.将任务加入队列
dispatch_sync(queue,^{
NSLog(@"1------%@",[NSThread currentThread]);
});
dispatch_sync(queue,^{
NSLog(@"2------%@",[NSThread currentThread]);
});
dispatch_sync(queue,^{
NSLog(@"3------%@",[NSThread currentThread]);
});
}
/*
异步函数 + 串行队列:会开启新的线程，但是任务是串行的，执行完一个任务后，再执行下一个任务
*/
-(void)asyncSerial{
//1.创建串行队列
dispatch_queue_t queue = dispatch_queue_create("com.queue",DISPATCH_QUEUE_SERIAL);
//2.将任务加入队列
dispatch_async(queue,^{
NSLog(@"1-----%@",[NSThread currentThread]);
});
dispatch_async(queue,^{
NSLog(@"2-----%@",[NSThread currentThread]);
});
dispatch_async(queue,^{
NSLog(@"3-----%@",[NSThread currentThread]);
});
}
/*
同步函数 + 并发队列:不会开启新的线程
*/
- (void)syncConcurrent{
//获得全局并发队列
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUUE_PRIORITY_DEFAULT,0);
dispatch_sync(queue,^{
NSLog(@"1-=======================%@",[NSThread currentThread]);//打印出来的是主线程
});
}
/**
异步函数 + 并发队列：可以同时开启多条函数
**/
-(void)asyncConcurrent{
dispatch_queue_t queue = dispatch_get_global_queue (DISPATCH_QUEUE_PRIORITY_DEFAULT,0);
dispatch_async(queue,^{
for(NSInteger i = 0; i < 10; i++){
NSLog(@"1-=======================%@",[NSThread currentThread]);
}
});
dispatch_async(queue,^{
for(NSInteger i = 0; i < 10; i++){
NSLog(@"2-=======================%@",[NSThread currentThread]);
}
});
dispatch_async(queue,^{
for(NSInteger i = 0; i < 10; i++){
NSLog(@"3-=======================%@",[NSThread currentThread]);
}
});
}