Iterative Servers
上圖中，客戶端2直到服務端迴應才運行，否則一直處理等待狀態。你可能會認爲此時的客戶端連接會被阻斷，但是嘗試一下會發現，連接是在內核kernel，然後返回，write也是執行後馬上返回，直到客戶端2調用了read函數 等待服務器的回覆。
Where Does Second Client Block?
Fundamental Flaw of Iterative Servers
Approaches for Writing Concurrent Servers
Approach #1: Process-based Servers
Concurrent Server: accept Illustrated
Process-based Server Execution Model
Issues with Process-based Servers
Pros and Cons of Process-based Servers
Approach #2: Event-based Servers
Pros and Cons of Event-based Servers
Approach #3: Thread-based Servers
Traditional View of a Process
Alternate View of a Process
A Process With Multiple Threads
上圖，我們認爲一個進程中有多個線程，如果對每個線程保持不同的數據線程內容集合，那麼每個線程有自己的stack，存放一些local variable。
Logical View of Threads
Issues With Thread-Based Servers
教授的Slides裏有很多C語言代碼，表示看不太懂，因此有些結合的知識點就沒聽懂，這篇視頻也沒有配備中文，INNA也搭載不了.ass字幕文件讓我有點懵逼。anyway，move on。 繼續學習。