extern bool freeze_task(struct task_struct *p, bool sig_only);
extern void cancel_freezing(struct task_struct *p);
+extern bool __set_freezable(bool with_signal);
#ifdef CONFIG_CGROUP_FREEZER
extern int cgroup_freezing_or_frozen(struct task_struct *task);
/*
* Tell the freezer that the current task should be frozen by it
*/
-static inline void set_freezable(void)
+static inline bool set_freezable(void)
{
- current->flags &= ~PF_NOFREEZE;
+ return __set_freezable(false);
}
/*
* Tell the freezer that the current task should be frozen by it and that it
* should send a fake signal to the task to freeze it.
*/
-static inline void set_freezable_with_signal(void)
+static inline bool set_freezable_with_signal(void)
{
- current->flags &= ~(PF_NOFREEZE | PF_FREEZER_NOSIG);
+ return __set_freezable(true);
}
/*
spin_lock_irqsave(&freezer_lock, flags);
- if (sig_only && !should_send_signal(p))
+ if ((p->flags & PF_NOFREEZE) ||
+ (sig_only && !should_send_signal(p)))
goto out_unlock;
if (frozen(p))
wake_up_process(p);
spin_unlock_irqrestore(&freezer_lock, flags);
}
+
+/**
+ * __set_freezable - make %current freezable
+ * @with_signal: do we want %TIF_SIGPENDING for notification too?
+ *
+ * Mark %current freezable and enter refrigerator if necessary.
+ */
+bool __set_freezable(bool with_signal)
+{
+ might_sleep();
+
+ /*
+ * Modify flags while holding freezer_lock. This ensures the
+ * freezer notices that we aren't frozen yet or the freezing
+ * condition is visible to try_to_freeze() below.
+ */
+ spin_lock_irq(&freezer_lock);
+ current->flags &= ~PF_NOFREEZE;
+ if (with_signal)
+ current->flags &= ~PF_FREEZER_NOSIG;
+ spin_unlock_irq(&freezer_lock);
+
+ return try_to_freeze();
+}
+EXPORT_SYMBOL(__set_freezable);
*/
#define TIMEOUT (20 * HZ)
-static inline int freezable(struct task_struct * p)
-{
- if ((p == current) ||
- (p->flags & PF_NOFREEZE))
- return 0;
- return 1;
-}
-
static int try_to_freeze_tasks(bool sig_only)
{
struct task_struct *g, *p;
todo = 0;
read_lock(&tasklist_lock);
do_each_thread(g, p) {
- if (frozen(p) || !freezable(p))
- continue;
-
- if (!freeze_task(p, sig_only))
+ if (p == current || !freeze_task(p, sig_only))
continue;
/*
read_lock(&tasklist_lock);
do_each_thread(g, p) {
- if (!freezable(p))
- continue;
-
if (cgroup_freezing_or_frozen(p))
continue;