resched_task()

设置进程p的thread_info中的flag域的TIF_NEED_RESCHED位，表示该进程需要调用调度程序执行进程切换

static inline void resched_task(task_t *p)
...{
    set_tsk_need_resched(p);
}

static inline void set_tsk_need_resched(struct task_struct *tsk)
...{
    set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
}

static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
...{
    set_ti_thread_flag(tsk->thread_info,flag);
}

static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
...{
    set_bit(flag,&ti->flags);
}

 


#define TIF_NEED_RESCHED    3
struct thread_info {
    ...
    unsigned long       flags;
    ...
};