之前以为Rust的channel中，sender写入数据后会通过pthread_cond_signal()来唤醒receiver。但通过示例程序和strace执行发现，receiver被唤醒时没有发现系统调用。想知道是通过什么方法唤醒的，多线程间的唤醒是否可以不经过系统调用。

Background # The thing is that I have a Logitech pebble and mx keys mini keyboard, and I use Bluetooth to connect them to my mac, but they randomly lost connection when I was using them,...