ThreadX支持的三种调度方式，时间片调度，抢占式调度和合作式调度

eric2013

ThreadX手册中说的轮询调度方式就是合作式调度。

和其它RTOS区别的地方是ThreadX有个抢占阈值，可以关闭一些高优先级任务抢占低优先级任务的执行。

合作式调度方式：

1. ULONG run_counter_1 = 0;
   
2. ULONG run_counter_2 = 0;
   
3. 
   
4. /* Example of two threads relinquishing control to
   
5. each other in an infinite loop. Assume that
   
6. both of these threads are ready and have the same
   
7. priority. The run counters will always stay within one
   
8. of each other. */
   
9. 
   
10. VOID my_first_thread(ULONG thread_input)
    
11. {
    
12.     /* Endless loop of relinquish. */
    
13.     while(1)
    
14.     {
    
15.         /* Increment the run counter. */
    
16.         run_counter_1++;
    
17. 
    
18.         /* Relinquish control to other thread. */
    
19.         tx_thread_relinquish();
    
20.     }
    
21. }
    
22. 
    
23. VOID my_second_thread(ULONG thread_input)
    
24. {
    
25. 
    
26.     /* Endless loop of relinquish. */
    
27.     while(1)
    
28.     {
    
29.         /* Increment the run counter. */
    
30.         run_counter_2++;
    
31. 
    
32.         /* Relinquish control to other thread. */
    
33.         tx_thread_relinquish();
    
34.     }
    
35. }

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