1
 // 并发队列
2
    dispatch_queue_t queue = dispatch_queue_create("test", DISPATCH_QUEUE_CONCURRENT);
3

4
    // 异步执行
5
    dispatch_async(queue, ^{
6
        for (int i = 0; i < 3; i++) {
7
            NSLog(@"栅栏：并发异步1   %@",[NSThread currentThread]);
8
        }
9
    });
10
    dispatch_async(queue, ^{
11
        for (int i = 0; i < 3; i++) {
12
            NSLog(@"栅栏：并发异步2   %@",[NSThread currentThread]);
13
        }
14
    });
15

16
    dispatch_barrier_async(queue, ^{
17
        NSLog(@"------------barrier------------%@", [NSThread currentThread]);
18
        NSLog(@"******* 并发异步执行，但是34一定在12后面 *********");
19
    });
20

21
    dispatch_async(queue, ^{
22
        for (int i = 0; i < 3; i++) {
23
            NSLog(@"栅栏：并发异步3   %@",[NSThread currentThread]);
24
        }
25
    });
26
    dispatch_async(queue, ^{
27
        for (int i = 0; i < 3; i++) {
28
            NSLog(@"栅栏：并发异步4   %@",[NSThread currentThread]);
29
        }
30
    });

1
 NSArray *array = [NSArray arrayWithObjects:@"/Users/chentao/Desktop/copy_res/gelato.ds",
2
                      @"/Users/chentao/Desktop/copy_res/jason.ds",
3
                      @"/Users/chentao/Desktop/copy_res/jikejunyi.ds",
4
                      @"/Users/chentao/Desktop/copy_res/molly.ds",
5
                      @"/Users/chentao/Desktop/copy_res/zhangdachuan.ds",
6
                      nil];
7
    NSString *copyDes = @"/Users/chentao/Desktop/copy_des";
8
    NSFileManager *fileManager = [NSFileManager defaultManager];
9
    dispatch_async(dispatch_get_global_queue(0, 0), ^(){
10
        dispatch_apply([array count], dispatch_get_global_queue(0, 0), ^(size_t index){
11
            NSLog(@"copy-%ld", index);
12
            NSString *sourcePath = [array objectAtIndex:index];
13
            NSString *desPath = [NSString stringWithFormat:@"%@/%@", copyDes, [sourcePath lastPathComponent]];
14
            [fileManager copyItemAtPath:sourcePath toPath:desPath error:nil];
15
        });
16
        NSLog(@"完成");
17
    });