GCDAsyncSocket异步串行子线程中for发送图片

GCDAsyncsocket 使用异步串行子线程中for循环执行一半就不执行了，代码如下，过程是点击发送按钮返回到主页面，然后异步执行下面的代码上传图片；

dispatch_queue_t queue = dispatch_queue_create("uploadImage", DISPATCH_QUEUE_SERIAL);
for (int i =0; i < 10; i++) {
dispatch_async(queue, ^{

         NSLog(@"async ------------ %@", [NSThread currentThread]);

        //第一张图的资源
        PHAsset *asset = self.sendImageArray[i];
        NSString *fileType;
        NSString *fileName;

        if (asset.mediaType == PHAssetMediaTypeImage) {
            fileType = @"jpg";
            NSData *data = [NSData dataWithContentsOfFile:filePath[i]];

            [self upLoadImageData:data type:@"jpg" name:fileName];
        } else if(asset.mediaType == PHAssetMediaTypeVideo) {
            fileType = @"mp4";
              NSData *data = [NSData dataWithContentsOfFile:filePath[i]];
            [self uploadMp4Data:data type:fileType name:fileName];

        }

      });
  }

看看是不是阻塞了线程

是不是uploadimagedata等函数，看是哪个函数阻塞了