Semaphore solve writers & readers priority Priority & Fair Competition (reader writer)

Let me talk about the issue:

Here are the pseudo-random rand. Solving is also very simple, srand can. Content too lazy to change the ~ ~

Description and ideas:

 

 

 

 

 

 

 

 

 

 

Code:

 

 

 

 

 

 

 

 

 

 

operation result:

 

 

Readers priority:

 

 

 

 

 

 

 

 

 

 

Renderings:

 

 

 

 

fair competition:

Only readers who write thread made some changes. Increase the amount of signal que. sem_init (& que, 0,1).

 

 

 

effect: