线程优先级

线程优先级由线程所属进程的优先级类、线程自身的相对优先级别共同确定，二者组合值作为线程的基优先级。（base   priority   level）  
   
  Win32系统中，线程基优先级的范围从最低优先级0到最高优先级31。

 

系統優先順序	程序優先順序類別	執行緒優先順序等級
1	IDLE_PRIORITY_CLASS	THREAD_PRIORITY_IDLE
1	BELOW_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_IDLE
1	NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_IDLE
1	ABOVE_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_IDLE
1	HIGH_PRIORITY_CLASS	THREAD_PRIORITY_IDLE
2	IDLE_PRIORITY_CLASS	THREAD_PRIORITY_LOWEST
3	IDLE_PRIORITY_CLASS	THREAD_PRIORITY_BELOW_NORMAL
4	IDLE_PRIORITY_CLASS	THREAD_PRIORITY_NORMAL
4	BELOW_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_LOWEST
5	IDLE_PRIORITY_CLASS	THREAD_PRIORITY_ABOVE_NORMAL
5	BELOW_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_BELOW_NORMAL
5	Background NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_LOWEST
6	IDLE_PRIORITY_CLASS	THREAD_PRIORITY_HIGHEST
6	BELOW_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_NORMAL
6	Background NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_BELOW_NORMAL
7	BELOW_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_ABOVE_NORMAL
7	Background NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_NORMAL
7	Foreground NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_LOWEST
8	BELOW_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_HIGHEST
8	NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_ABOVE_NORMAL
8	Foreground NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_BELOW_NORMAL
8	ABOVE_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_LOWEST
9	NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_HIGHEST
9	Foreground NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_NORMAL
9	ABOVE_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_BELOW_NORMAL
10	Foreground NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_ABOVE_NORMAL
10	ABOVE_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_NORMAL
11	Foreground NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_HIGHEST
11	ABOVE_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_ABOVE_NORMAL
11	HIGH_PRIORITY_CLASS	THREAD_PRIORITY_LOWEST
12	ABOVE_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_HIGHEST
12	HIGH_PRIORITY_CLASS	THREAD_PRIORITY_BELOW_NORMAL
13	HIGH_PRIORITY_CLASS	THREAD_PRIORITY_NORMAL
14	HIGH_PRIORITY_CLASS	THREAD_PRIORITY_ABOVE_NORMAL
15	HIGH_PRIORITY_CLASS	THREAD_PRIORITY_HIGHEST
15	HIGH_PRIORITY_CLASS	THREAD_PRIORITY_TIME_CRITICAL
15	IDLE_PRIORITY_CLASS	THREAD_PRIORITY_TIME_CRITICAL
15	BELOW_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_TIME_CRITICAL
15	NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_TIME_CRITICAL
15	ABOVE_NORMAL_PRIORITY_CLASS	THREAD_PRIORITY_TIME_CRITICAL
16	REALTIME_PRIORITY_CLASS	THREAD_PRIORITY_IDLE
17	REALTIME_PRIORITY_CLASS	-7
18	REALTIME_PRIORITY_CLASS	-6
19	REALTIME_PRIORITY_CLASS	-5
20	REALTIME_PRIORITY_CLASS	-4
21	REALTIME_PRIORITY_CLASS	-3
22	REALTIME_PRIORITY_CLASS	THREAD_PRIORITY_LOWEST
23	REALTIME_PRIORITY_CLASS	THREAD_PRIORITY_BELOW_NORMAL
24	REALTIME_PRIORITY_CLASS	THREAD_PRIORITY_NORMAL
25	REALTIME_PRIORITY_CLASS	THREAD_PRIORITY_ABOVE_NORMAL
26	REALTIME_PRIORITY_CLASS	THREAD_PRIORITY_HIGHEST
27	REALTIME_PRIORITY_CLASS	3
28	REALTIME_PRIORITY_CLASS	4
29	REALTIME_PRIORITY_CLASS	5
30	REALTIME_PRIORITY_CLASS	6
31	REALTIME_PRIORITY_CLASS	THREAD_PRIORITY_TIME_CRITICAL