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authorOleg Nesterov <oleg@tv-sign.ru>2006-09-29 02:01:11 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:21 -0700
commitc394cc9fbb367f87faa2228ec2eabacd2d4701c6 (patch)
tree2177214ac92b3a7ac21cb2632786c9de728c3868 /kernel
parent55a101f8f71a3d3dbda7b5c77083ffe47552f831 (diff)
downloadop-kernel-dev-c394cc9fbb367f87faa2228ec2eabacd2d4701c6.zip
op-kernel-dev-c394cc9fbb367f87faa2228ec2eabacd2d4701c6.tar.gz
[PATCH] introduce TASK_DEAD state
I am not sure about this patch, I am asking Ingo to take a decision. task_struct->state == EXIT_DEAD is a very special case, to avoid a confusion it makes sense to introduce a new state, TASK_DEAD, while EXIT_DEAD should live only in ->exit_state as documented in sched.h. Note that this state is not visible to user-space, get_task_state() masks off unsuitable states. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/exit.c2
-rw-r--r--kernel/sched.c8
2 files changed, 5 insertions, 5 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index 9dd5f13..2e4c13c 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -955,7 +955,7 @@ fastcall NORET_TYPE void do_exit(long code)
preempt_disable();
/* causes final put_task_struct in finish_task_switch(). */
- tsk->state = EXIT_DEAD;
+ tsk->state = TASK_DEAD;
schedule();
BUG();
diff --git a/kernel/sched.c b/kernel/sched.c
index a9405d7..74f169a 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1761,10 +1761,10 @@ static inline void finish_task_switch(struct rq *rq, struct task_struct *prev)
/*
* A task struct has one reference for the use as "current".
- * If a task dies, then it sets EXIT_DEAD in tsk->state and calls
+ * If a task dies, then it sets TASK_DEAD in tsk->state and calls
* schedule one last time. The schedule call will never return, and
* the scheduled task must drop that reference.
- * The test for EXIT_DEAD must occur while the runqueue locks are
+ * The test for TASK_DEAD must occur while the runqueue locks are
* still held, otherwise prev could be scheduled on another cpu, die
* there before we look at prev->state, and then the reference would
* be dropped twice.
@@ -1775,7 +1775,7 @@ static inline void finish_task_switch(struct rq *rq, struct task_struct *prev)
finish_lock_switch(rq, prev);
if (mm)
mmdrop(mm);
- if (unlikely(prev_state == EXIT_DEAD)) {
+ if (unlikely(prev_state == TASK_DEAD)) {
/*
* Remove function-return probe instances associated with this
* task and put them back on the free list.
@@ -5153,7 +5153,7 @@ static void migrate_dead(unsigned int dead_cpu, struct task_struct *p)
BUG_ON(p->exit_state != EXIT_ZOMBIE && p->exit_state != EXIT_DEAD);
/* Cannot have done final schedule yet: would have vanished. */
- BUG_ON(p->state == EXIT_DEAD);
+ BUG_ON(p->state == TASK_DEAD);
get_task_struct(p);
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