/* Freezer declarations */
#include <linux/sched.h>
#ifdef CONFIG_PM
/*
* Check if a process has been frozen
*/
static inline int frozen(struct task_struct *p)
{
return p->flags & PF_FROZEN;
}
* Check if there is a request to freeze a process
static inline int freezing(struct task_struct *p)
return test_tsk_thread_flag(p, TIF_FREEZE);
* Request that a process be frozen
static inline void freeze(struct task_struct *p)
set_tsk_thread_flag(p, TIF_FREEZE);
* Sometimes we may need to cancel the previous 'freeze' request
static inline void do_not_freeze(struct task_struct *p)
clear_tsk_thread_flag(p, TIF_FREEZE);
* Wake up a frozen process
static inline int thaw_process(struct task_struct *p)
if (frozen(p)) {
p->flags &= ~PF_FROZEN;
wake_up_process(p);
return 1;
return 0;
* freezing is complete, mark process as frozen
static inline void frozen_process(struct task_struct *p)
p->flags |= PF_FROZEN;
wmb();
extern void refrigerator(void);
extern int freeze_processes(void);
extern void thaw_processes(void);
static inline int try_to_freeze(void)
if (freezing(current)) {
refrigerator();
} else
extern void thaw_some_processes(int all);
#else
static inline int frozen(struct task_struct *p) { return 0; }
static inline int freezing(struct task_struct *p) { return 0; }
static inline void freeze(struct task_struct *p) { BUG(); }
static inline int thaw_process(struct task_struct *p) { return 1; }
static inline void frozen_process(struct task_struct *p) { BUG(); }
static inline void refrigerator(void) {}
static inline int freeze_processes(void) { BUG(); return 0; }
static inline void thaw_processes(void) {}
static inline int try_to_freeze(void) { return 0; }
#endif