因为任务由多个线程组成，使用IPC机制的代码又被放在线程内部，所以Mach可在消息处理前后冻结和解冻线程。

Since tasks consisted of multiple threads, and it was the code in the threads that used the IPC mechanism, Mach was able to freeze and unfreeze threads while the message was handled.

youdao

因为任务由多个线程组成，使用IPC机制的代码又被放在线程内部，所以Mach可在消息处理前后冻结和解冻线程。

Since tasks consisted of multiple threads, and it was the code in the threads that used the IPC mechanism, Mach was able to freeze and unfreeze threads while the message was handled.

youdao