projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 7dfb7103 NC |
1 | /* Freezer declarations */ |
| 2 | ||
| 3 | #ifdef CONFIG_PM | |
| 4 | /* | |
| 5 | * Check if a process has been frozen | |
| 6 | */ | |
| 7 | static inline int frozen(struct task_struct *p) | |
| 8 | { | |
| 9 | return p->flags & PF_FROZEN; | |
| 10 | } | |
| 11 | ||
| 12 | /* | |
| 13 | * Check if there is a request to freeze a process | |
| 14 | */ | |
| 15 | static inline int freezing(struct task_struct *p) | |
| 16 | { | |
| 17 | return p->flags & PF_FREEZE; | |
| 18 | } | |
| 19 | ||
| 20 | /* | |
| 21 | * Request that a process be frozen | |
| 22 | * FIXME: SMP problem. We may not modify other process' flags! | |
| 23 | */ | |
| 24 | static inline void freeze(struct task_struct *p) | |
| 25 | { | |
| 26 | p->flags |= PF_FREEZE; | |
| 27 | } | |
| 28 | ||
| 29 | /* | |
| 30 | * Sometimes we may need to cancel the previous 'freeze' request | |
| 31 | */ | |
| 32 | static inline void do_not_freeze(struct task_struct *p) | |
| 33 | { | |
| 34 | p->flags &= ~PF_FREEZE; | |
| 35 | } | |
| 36 | ||
| 37 | /* | |
| 38 | * Wake up a frozen process | |
| 39 | */ | |
| 40 | static inline int thaw_process(struct task_struct *p) | |
| 41 | { | |
| 42 | if (frozen(p)) { | |
| 43 | p->flags &= ~PF_FROZEN; | |
| 44 | wake_up_process(p); | |
| 45 | return 1; | |
| 46 | } | |
| 47 | return 0; | |
| 48 | } | |
| 49 | ||
| 50 | /* | |
| 51 | * freezing is complete, mark process as frozen | |
| 52 | */ | |
| 53 | static inline void frozen_process(struct task_struct *p) | |
| 54 | { | |
| 55 | p->flags = (p->flags & ~PF_FREEZE) | PF_FROZEN; | |
| 56 | } | |
| 57 | ||
| 58 | extern void refrigerator(void); | |
| 59 | extern int freeze_processes(void); | |
| 60 | extern void thaw_processes(void); | |
| 61 | ||
| 62 | static inline int try_to_freeze(void) | |
| 63 | { | |
| 64 | if (freezing(current)) { | |
| 65 | refrigerator(); | |
| 66 | return 1; | |
| 67 | } else | |
| 68 | return 0; | |
| 69 | } | |
| 70 | #else | |
| 71 | static inline int frozen(struct task_struct *p) { return 0; } | |
| 72 | static inline int freezing(struct task_struct *p) { return 0; } | |
| 73 | static inline void freeze(struct task_struct *p) { BUG(); } | |
| 74 | static inline int thaw_process(struct task_struct *p) { return 1; } | |
| 75 | static inline void frozen_process(struct task_struct *p) { BUG(); } | |
| 76 | ||
| 77 | static inline void refrigerator(void) {} | |
| 78 | static inline int freeze_processes(void) { BUG(); return 0; } | |
| 79 | static inline void thaw_processes(void) {} | |
| 80 | ||
| 81 | static inline int try_to_freeze(void) { return 0; } | |
| 82 | ||
| 83 | ||
| 84 | #endif |