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has_stopped_jobs: s/task_is_stopped/SIGNAL_STOP_STOPPED/

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has_stopped_jobs() naively checks task_is_stopped(group_leader). This
was always wrong even without ptrace, group_leader can be dead. And
given that ptrace can change the state to TRACED this is wrong even
in the single-threaded case.

Change the code to check SIGNAL_STOP_STOPPED and simplify the code,
retval + break/continue doesn't make this trivial code more readable.

We could probably add the usual "|| signal->group_stop_count" check
but I don't think this makes sense, the task can start the group-stop
right after the check anyway.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Oleg Nesterov 2011-07-07 21:33:54 +02:00
parent bb188d7e64
commit 961c4675c7
1 changed files with 5 additions and 7 deletions
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12
kernel/exit.c
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@ -266,18 +266,16 @@ int is_current_pgrp_orphaned(void)
return retval; return retval;
} }
static int has_stopped_jobs(struct pid *pgrp) static bool has_stopped_jobs(struct pid *pgrp)
{ {
int retval = 0;
struct task_struct *p; struct task_struct *p;
do_each_pid_task(pgrp, PIDTYPE_PGID, p) { do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
if (!task_is_stopped(p)) if (p->signal->flags & SIGNAL_STOP_STOPPED)
continue; return true;
retval = 1;
break;
} while_each_pid_task(pgrp, PIDTYPE_PGID, p); } while_each_pid_task(pgrp, PIDTYPE_PGID, p);
return retval;
return false;
} }
/* /*