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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _LINUX_PID_H |
| 2 | #define _LINUX_PID_H |
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| 3 | |||
| 4 | enum pid_type |
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| 5 | { |
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| 6 | PIDTYPE_PID, |
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| 7 | PIDTYPE_TGID, |
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| 8 | PIDTYPE_PGID, |
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| 9 | PIDTYPE_SID, |
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| 10 | PIDTYPE_MAX |
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| 11 | }; |
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| 12 | |||
| 13 | struct pid |
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| 14 | { |
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| 15 | int nr; |
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| 16 | atomic_t count; |
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| 17 | struct task_struct *task; |
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| 18 | struct list_head task_list; |
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| 19 | struct list_head hash_chain; |
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| 20 | }; |
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| 21 | |||
| 22 | struct pid_link |
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| 23 | { |
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| 24 | struct list_head pid_chain; |
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| 25 | struct pid *pidptr; |
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| 26 | struct pid pid; |
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| 27 | }; |
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| 28 | |||
| 29 | #define pid_task(elem, type) \ |
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| 30 | list_entry(elem, struct task_struct, pids[type].pid_chain) |
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| 31 | |||
| 32 | /* |
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| 33 | * attach_pid() and link_pid() must be called with the tasklist_lock |
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| 34 | * write-held. |
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| 35 | */ |
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| 36 | extern int FASTCALL(attach_pid(struct task_struct *task, enum pid_type type, int nr)); |
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| 37 | |||
| 38 | extern void FASTCALL(link_pid(struct task_struct *task, struct pid_link *link, struct pid *pid)); |
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| 39 | |||
| 40 | /* |
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| 41 | * detach_pid() must be called with the tasklist_lock write-held. |
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| 42 | */ |
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| 43 | extern void FASTCALL(detach_pid(struct task_struct *task, enum pid_type)); |
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| 44 | |||
| 45 | /* |
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| 46 | * look up a PID in the hash table. Must be called with the tasklist_lock |
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| 47 | * held. |
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| 48 | */ |
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| 49 | extern struct pid *FASTCALL(find_pid(enum pid_type, int)); |
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| 50 | |||
| 51 | extern int alloc_pidmap(void); |
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| 52 | extern void FASTCALL(free_pidmap(int)); |
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| 53 | extern void switch_exec_pids(struct task_struct *leader, struct task_struct *thread); |
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| 54 | |||
| 55 | #define for_each_task_pid(who, type, task, elem, pid) \ |
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| 56 | if ((pid = find_pid(type, who))) \ |
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| 57 | for (elem = pid->task_list.next, \ |
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| 58 | prefetch(elem->next), \ |
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| 59 | task = pid_task(elem, type); \ |
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| 60 | elem != &pid->task_list; \ |
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| 61 | elem = elem->next, prefetch(elem->next), \ |
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| 62 | task = pid_task(elem, type)) |
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| 63 | |||
| 64 | #endif /* _LINUX_PID_H */ |