summaryrefslogtreecommitdiff
path: root/include/linux/pid.h
diff options
context:
space:
mode:
authorEric W. Biederman <ebiederm@xmission.com>2017-06-04 04:32:13 -0500
committerEric W. Biederman <ebiederm@xmission.com>2018-07-21 10:43:12 -0500
commit6883f81aac6f44e7df70a6af189b3689ff52cbfb (patch)
tree184e376d23aa5ea7321e22f23dd78a3c77c74a63 /include/linux/pid.h
parent2c4704756cab7cfa031ada4dab361562f0e357c0 (diff)
pid: Implement PIDTYPE_TGID
Everywhere except in the pid array we distinguish between a tasks pid and a tasks tgid (thread group id). Even in the enumeration we want that distinction sometimes so we have added __PIDTYPE_TGID. With leader_pid we almost have an implementation of PIDTYPE_TGID in struct signal_struct. Add PIDTYPE_TGID as a first class member of the pid_type enumeration and into the pids array. Then remove the __PIDTYPE_TGID special case and the leader_pid in signal_struct. The net size increase is just an extra pointer added to struct pid and an extra pair of pointers of an hlist_node added to task_struct. The effect on code maintenance is the removal of a number of special cases today and the potential to remove many more special cases as PIDTYPE_TGID gets used to it's fullest. The long term potential is allowing zombie thread group leaders to exit, which will remove a lot more special cases in the code. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'include/linux/pid.h')
-rw-r--r--include/linux/pid.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/include/linux/pid.h b/include/linux/pid.h
index 3d4c504dcc8c..14a9a39da9c7 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -7,11 +7,10 @@
enum pid_type
{
PIDTYPE_PID,
+ PIDTYPE_TGID,
PIDTYPE_PGID,
PIDTYPE_SID,
PIDTYPE_MAX,
- /* only valid to __task_pid_nr_ns() */
- __PIDTYPE_TGID
};
/*