int process_cnt=0;
struct task_struct *task = &init_task;  // 全局进程列表
struct task_struct *p;
struct list_head *pos;

read_lock(&tasklist_lock);
list_for_each(pos,&task->tasks)
{
    p = list_entry(pos, struct task_struct, tasks);
    process_cnt ++;
    os_printf("%d--->%s\n", p->pid,p->comm);
}

read_unlock(&tasklist_lock);
os_printf("the number of process is:%d \n", process_cnt);