是的，有可能。
有很多同步工具可用：

Yes, it is possible. There are quite a few synchronization tools available:

• @synchronized


• NSLock


• NSCondition


• NSConditionLock


• GCD信号量


• pthread locks


• ...

• @synchronized
• NSLock
• NSCondition
• NSConditionLock
• GCD semaphores
• pthread locks
• ...

我建议阅读线程编程指南并询问更具体的内容。

I'd suggest reading "Threading Programming Guide" and asking something more specific.