91 lines
1.8 KiB
C
91 lines
1.8 KiB
C
/* 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();
|
|
clear_tsk_thread_flag(p, TIF_FREEZE);
|
|
}
|
|
|
|
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();
|
|
return 1;
|
|
} else
|
|
return 0;
|
|
}
|
|
|
|
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
|