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56 lines
1.4 KiB
56 lines
1.4 KiB
20 years ago
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#ifndef _LINUX_PID_H
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#define _LINUX_PID_H
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enum pid_type
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{
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PIDTYPE_PID,
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PIDTYPE_TGID,
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PIDTYPE_PGID,
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PIDTYPE_SID,
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PIDTYPE_MAX
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};
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struct pid
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{
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/* Try to keep pid_chain in the same cacheline as nr for find_pid */
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int nr;
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struct hlist_node pid_chain;
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/* list of pids with the same nr, only one of them is in the hash */
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struct list_head pid_list;
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};
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#define pid_task(elem, type) \
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list_entry(elem, struct task_struct, pids[type].pid_list)
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/*
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* attach_pid() and detach_pid() must be called with the tasklist_lock
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* write-held.
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*/
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extern int FASTCALL(attach_pid(struct task_struct *task, enum pid_type type, int nr));
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extern void FASTCALL(detach_pid(struct task_struct *task, enum pid_type));
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/*
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* look up a PID in the hash table. Must be called with the tasklist_lock
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* held.
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*/
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extern struct pid *FASTCALL(find_pid(enum pid_type, int));
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extern int alloc_pidmap(void);
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extern void FASTCALL(free_pidmap(int));
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extern void switch_exec_pids(struct task_struct *leader, struct task_struct *thread);
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#define do_each_task_pid(who, type, task) \
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if ((task = find_task_by_pid_type(type, who))) { \
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prefetch((task)->pids[type].pid_list.next); \
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do {
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#define while_each_task_pid(who, type, task) \
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} while (task = pid_task((task)->pids[type].pid_list.next,\
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type), \
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prefetch((task)->pids[type].pid_list.next), \
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hlist_unhashed(&(task)->pids[type].pid_chain)); \
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} \
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#endif /* _LINUX_PID_H */
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