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/* Freezer declarations */
#define FREEZER_KERNEL_THREADS 0
#define FREEZER_ALL_THREADS 1
#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 p->flags & PF_FREEZE;
}
/*
* Request that a process be frozen
* FIXME: SMP problem. We may not modify other process' flags!
*/
static inline void freeze(struct task_struct *p)
{
p->flags |= PF_FREEZE;
}
/*
* Sometimes we may need to cancel the previous 'freeze' request
*/
static inline void do_not_freeze(struct task_struct *p)
{
p->flags &= ~PF_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 = (p->flags & ~PF_FREEZE) | PF_FROZEN;
}
extern void refrigerator(void);
extern int freeze_processes(void);
#define thaw_processes() do { thaw_some_processes(FREEZER_ALL_THREADS); } while(0)
#define thaw_kernel_threads() do { thaw_some_processes(FREEZER_KERNEL_THREADS); } while(0)
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
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