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| author | Eric W. Biederman <ebiederm@xmission.com> | 2017-06-04 11:32:13 +0200 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-07-21 17:43:12 +0200 |
| commit | 6883f81aac6f44e7df70a6af189b3689ff52cbfb (patch) | |
| tree | 184e376d23aa5ea7321e22f23dd78a3c77c74a63 /init | |
| parent | pids: Move the pgrp and session pid pointers from task_struct to signal_struct (diff) | |
| download | linux-6883f81aac6f44e7df70a6af189b3689ff52cbfb.tar.xz linux-6883f81aac6f44e7df70a6af189b3689ff52cbfb.zip | |
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.c | 2 |
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, }, |