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