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authorEric W. Biederman <ebiederm@xmission.com>2017-06-04 12:32:13 +0300
committerEric W. Biederman <ebiederm@xmission.com>2018-07-21 18:43:12 +0300
commit6883f81aac6f44e7df70a6af189b3689ff52cbfb (patch)
tree184e376d23aa5ea7321e22f23dd78a3c77c74a63 /init
parent2c4704756cab7cfa031ada4dab361562f0e357c0 (diff)
downloadlinux-6883f81aac6f44e7df70a6af189b3689ff52cbfb.tar.xz
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 'init')
-rw-r--r--init/init_task.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/init/init_task.c b/init/init_task.c
index db12a61259f1..4f97846256d7 100644
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -33,9 +33,9 @@ static struct signal_struct init_signals = {
},
#endif
INIT_CPU_TIMERS(init_signals)
- .leader_pid = &init_struct_pid,
.pids = {
[PIDTYPE_PID] = &init_struct_pid,
+ [PIDTYPE_TGID] = &init_struct_pid,
[PIDTYPE_PGID] = &init_struct_pid,
[PIDTYPE_SID] = &init_struct_pid,
},