线程优先级

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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1IDLE_PRIORITY_CLASSTHREAD_PRIORITY_IDLE1BELOW_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_IDLE1NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_IDLE1ABOVE_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_IDLE1HIGH_PRIORITY_CLASSTHREAD_PRIORITY_IDLE2IDLE_PRIORITY_CLASSTHREAD_PRIORITY_LOWEST3IDLE_PRIORITY_CLASSTHREAD_PRIORITY_BELOW_NORMAL4IDLE_PRIORITY_CLASSTHREAD_PRIORITY_NORMAL4BELOW_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_LOWEST5IDLE_PRIORITY_CLASSTHREAD_PRIORITY_ABOVE_NORMAL5BELOW_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_BELOW_NORMAL5Background NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_LOWEST6IDLE_PRIORITY_CLASSTHREAD_PRIORITY_HIGHEST6BELOW_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_NORMAL6Background NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_BELOW_NORMAL7BELOW_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_ABOVE_NORMAL7Background NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_NORMAL7Foreground NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_LOWEST8BELOW_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_HIGHEST8NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_ABOVE_NORMAL8Foreground NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_BELOW_NORMAL8ABOVE_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_LOWEST9NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_HIGHEST9Foreground NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_NORMAL9ABOVE_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_BELOW_NORMAL10Foreground NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_ABOVE_NORMAL10ABOVE_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_NORMAL11Foreground NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_HIGHEST11ABOVE_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_ABOVE_NORMAL11HIGH_PRIORITY_CLASSTHREAD_PRIORITY_LOWEST12ABOVE_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_HIGHEST12HIGH_PRIORITY_CLASSTHREAD_PRIORITY_BELOW_NORMAL13HIGH_PRIORITY_CLASSTHREAD_PRIORITY_NORMAL14HIGH_PRIORITY_CLASSTHREAD_PRIORITY_ABOVE_NORMAL15HIGH_PRIORITY_CLASSTHREAD_PRIORITY_HIGHEST15HIGH_PRIORITY_CLASSTHREAD_PRIORITY_TIME_CRITICAL15IDLE_PRIORITY_CLASSTHREAD_PRIORITY_TIME_CRITICAL15BELOW_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_TIME_CRITICAL15NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_TIME_CRITICAL15ABOVE_NORMAL_PRIORITY_CLASSTHREAD_PRIORITY_TIME_CRITICAL16REALTIME_PRIORITY_CLASSTHREAD_PRIORITY_IDLE17REALTIME_PRIORITY_CLASS-718REALTIME_PRIORITY_CLASS-619REALTIME_PRIORITY_CLASS-520REALTIME_PRIORITY_CLASS-421REALTIME_PRIORITY_CLASS-322REALTIME_PRIORITY_CLASSTHREAD_PRIORITY_LOWEST23REALTIME_PRIORITY_CLASSTHREAD_PRIORITY_BELOW_NORMAL24REALTIME_PRIORITY_CLASSTHREAD_PRIORITY_NORMAL25REALTIME_PRIORITY_CLASSTHREAD_PRIORITY_ABOVE_NORMAL26REALTIME_PRIORITY_CLASSTHREAD_PRIORITY_HIGHEST27REALTIME_PRIORITY_CLASS328REALTIME_PRIORITY_CLASS429REALTIME_PRIORITY_CLASS530REALTIME_PRIORITY_CLASS631REALTIME_PRIORITY_CLASSTHREAD_PRIORITY_TIME_CRITICAL