一些宏定义

• 主线程同步，避免死锁

  #ifndef dispatch_main_sync_safe
  #define dispatch_main_sync_safe(block)\
  if (strcmp(dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL), dispatch_queue_get_label(dispatch_get_main_queue())) == 0) {\
      block();\
  } else {\
      dispatch_sync(dispatch_get_main_queue(), block);\
  }
  #endif

• 主线程异步

  #ifndef dispatch_main_async_safe
  #define dispatch_main_async_safe(block)\
      if (strcmp(dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL), dispatch_queue_get_label(dispatch_get_main_queue())) == 0) {\
          block();\
      } else {\
          dispatch_async(dispatch_get_main_queue(), block);\
      }
  #endif

• dispatch_queue_get_label

  * @abstract
  * Returns the label of the given queue, as specified when the queue was
  * created, or the empty string if a NULL label was specified.
  *
  * Passing DISPATCH_CURRENT_QUEUE_LABEL will return the label of the current
  *
  *
  * @param queue
  * The queue to query, or DISPATCH_CURRENT_QUEUE_LABEL.
  
  // 返回指定队列名称，为空返回NULL
  // 入参为队列 or DISPATCH_CURRENT_QUEUE_LABEL
  // DISPATCH_CURRENT_QUEUE_LABEL：表示返回当前队列名称

赏

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