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authorPavel Emelyanov <xemul@openvz.org>2007-10-19 08:40:18 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 20:53:40 +0200
commitbac0abd6174e427404dd197cdbefece31e97329b (patch)
tree68ed6bd8619552c921c9fb99e83cb04fcb235a39 /include
parentpid namespaces: remove the struct pid unneeded fields (diff)
downloadlinux-bac0abd6174e427404dd197cdbefece31e97329b.tar.xz
linux-bac0abd6174e427404dd197cdbefece31e97329b.zip
Isolate some explicit usage of task->tgid
With pid namespaces this field is now dangerous to use explicitly, so hide it behind the helpers. Also the pid and pgrp fields o task_struct and signal_struct are to be deprecated. Unfortunately this patch cannot be sent right now as this leads to tons of warnings, so start isolating them, and deprecate later. Actually the p->tgid == pid has to be changed to has_group_leader_pid(), but Oleg pointed out that in case of posix cpu timers this is the same, and thread_group_leader() is more preferable. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sched.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index f4d969e85612..eb2ae68804aa 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1725,6 +1725,12 @@ static inline int has_group_leader_pid(struct task_struct *p)
return p->pid == p->tgid;
}
+static inline
+int same_thread_group(struct task_struct *p1, struct task_struct *p2)
+{
+ return p1->tgid == p2->tgid;
+}
+
static inline struct task_struct *next_thread(const struct task_struct *p)
{
return list_entry(rcu_dereference(p->thread_group.next),