processes around? */
long save;
save = current->state;
- current->state = TASK_UNINTERRUPTIBLE;
pr_debug("%s entered refrigerator\n", current->comm);
printk("=");
recalc_sigpending(); /* We sent fake signal, clean it up */
spin_unlock_irq(¤t->sighand->siglock);
- while (frozen(current))
+ while (frozen(current)) {
+ current->state = TASK_UNINTERRUPTIBLE;
schedule();
+ }
pr_debug("%s left refrigerator\n", current->comm);
current->state = save;
}
int todo;
unsigned long start_time;
struct task_struct *g, *p;
+ unsigned long flags;
printk( "Stopping tasks: " );
start_time = jiffies;
todo = 0;
read_lock(&tasklist_lock);
do_each_thread(g, p) {
- unsigned long flags;
if (!freezeable(p))
continue;
- if ((frozen(p)) ||
- (p->state == TASK_TRACED) ||
- (p->state == TASK_STOPPED))
+ if (frozen(p))
continue;
freeze(p);
} while_each_thread(g, p);
read_unlock(&tasklist_lock);
yield(); /* Yield is okay here */
- if (time_after(jiffies, start_time + TIMEOUT)) {
+ if (todo && time_after(jiffies, start_time + TIMEOUT)) {
printk( "\n" );
printk(KERN_ERR " stopping tasks failed (%d tasks remaining)\n", todo );
- return todo;
+ break;
}
} while(todo);
+ /* This does not unfreeze processes that are already frozen
+ * (we have slightly ugly calling convention in that respect,
+ * and caller must call thaw_processes() if something fails),
+ * but it cleans up leftover PF_FREEZE requests.
+ */
+ if (todo) {
+ read_lock(&tasklist_lock);
+ do_each_thread(g, p)
+ if (freezing(p)) {
+ pr_debug(" clean up: %s\n", p->comm);
+ p->flags &= ~PF_FREEZE;
+ spin_lock_irqsave(&p->sighand->siglock, flags);
+ recalc_sigpending_tsk(p);
+ spin_unlock_irqrestore(&p->sighand->siglock, flags);
+ }
+ while_each_thread(g, p);
+ read_unlock(&tasklist_lock);
+ return todo;
+ }
+
printk( "|\n" );
BUG_ON(in_atomic());
return 0;