stuct pid 阅读include/linux/pid.h中 >What is struct pid?” struct upid /Try to keep pid chain in the same cacheline as nr for find pid int nr; struct pid_namespace *ns; struct hlist node pid chain; }; struct pid atomic_t count; /lists of tasks that use this pid * struct hlist_head tasks [PIDTYPE_MAX]; struct rcu head rcu; unsigned int level; struct upid numbers[1]; static inline pid_t pid_nr(struct pid *pid) Cience an pid t nr =0; if (pid) nr pid->numbers[0].nr; 2023/7/14 Linux操作系统分析 return nr;2023/7/14 Linux操作系统分析 12/65 stuct pid ❖阅读include/linux/pid.h中 ➢“What is struct pid?