Native asynchronous network communication executes faster than synchronous instructions

It is generally believed that starting an asynchronous operation , The execution will be later than the subsequent synchronization instructions , At least later than the latest synchronization instruction

It's similar to the following

bool isRecv = true;
byte[] data = new byte[] { 1 };
SendAsync(data);// send out 
isRecv = false;

// receive 
void OnRecv()
{
    isRecv = true;
}

Normally , After sending the data ,isRecv=false, Should run in OnRecv Set in isRecv=true Before .

Because it's network communication , At least after a certain transmission time .

But when debugging, I found , occasionally isRecv=true First set up , That is to say, local network transmission , Very fast ,

Faster than executing the next synchronization instruction , In particular, this synchronization instruction is not a time-consuming operation .

A little unexpected hahaha , Make a note of , Write code more strictly in the future .