X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Ffreezer.h;h=5a361f85cfec483e0a595dcb2f4c2ee632ac56d9;hb=9f6532519feab921856f41b30a2397ee25f4de49;hp=2d38b1a7466251bded8a45d01d41cca577cf40b1;hpb=831441862956fffa17b9801db37e6ea1650b0f69;p=safe%2Fjmp%2Flinux-2.6

diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index 2d38b1a..5a361f8 100644
--- a/include/linux/freezer.h
+++ b/include/linux/freezer.h
@@ -4,8 +4,9 @@
 #define FREEZER_H_INCLUDED
 
 #include <linux/sched.h>
+#include <linux/wait.h>
 
-#ifdef CONFIG_PM
+#ifdef CONFIG_FREEZER
 /*
  * Check if a process has been frozen
  */
@@ -25,7 +26,7 @@ static inline int freezing(struct task_struct *p)
 /*
  * Request that a process be frozen
  */
-static inline void freeze(struct task_struct *p)
+static inline void set_freeze_flag(struct task_struct *p)
 {
 	set_tsk_thread_flag(p, TIF_FREEZE);
 }
@@ -33,34 +34,19 @@ static inline void freeze(struct task_struct *p)
 /*
  * Sometimes we may need to cancel the previous 'freeze' request
  */
-static inline void do_not_freeze(struct task_struct *p)
+static inline void clear_freeze_flag(struct task_struct *p)
 {
 	clear_tsk_thread_flag(p, TIF_FREEZE);
 }
 
-/*
- * Wake up a frozen process
- *
- * task_lock() is taken to prevent the race with refrigerator() which may
- * occur if the freezing of tasks fails.  Namely, without the lock, if the
- * freezing of tasks failed, thaw_tasks() might have run before a task in
- * refrigerator() could call frozen_process(), in which case the task would be
- * frozen and no one would thaw it.
- */
-static inline int thaw_process(struct task_struct *p)
+static inline bool should_send_signal(struct task_struct *p)
 {
-	task_lock(p);
-	if (frozen(p)) {
-		p->flags &= ~PF_FROZEN;
-		task_unlock(p);
-		wake_up_process(p);
-		return 1;
-	}
-	clear_tsk_thread_flag(p, TIF_FREEZE);
-	task_unlock(p);
-	return 0;
+	return !(p->flags & PF_FREEZER_NOSIG);
 }
 
+/* Takes and releases task alloc lock using task_lock() */
+extern int thaw_process(struct task_struct *p);
+
 extern void refrigerator(void);
 extern int freeze_processes(void);
 extern void thaw_processes(void);
@@ -74,6 +60,15 @@ static inline int try_to_freeze(void)
 		return 0;
 }
 
+extern bool freeze_task(struct task_struct *p, bool sig_only);
+extern void cancel_freezing(struct task_struct *p);
+
+#ifdef CONFIG_CGROUP_FREEZER
+extern int cgroup_frozen(struct task_struct *task);
+#else /* !CONFIG_CGROUP_FREEZER */
+static inline int cgroup_frozen(struct task_struct *task) { return 0; }
+#endif /* !CONFIG_CGROUP_FREEZER */
+
 /*
  * The PF_FREEZER_SKIP flag should be set by a vfork parent right before it
  * calls wait_for_completion(&vfork) and reset right after it returns from this
@@ -126,10 +121,50 @@ static inline void set_freezable(void)
 	current->flags &= ~PF_NOFREEZE;
 }
 
-#else
+/*
+ * 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)
+{
+	current->flags &= ~(PF_NOFREEZE | PF_FREEZER_NOSIG);
+}
+
+/*
+ * Freezer-friendly wrappers around wait_event_interruptible() and
+ * wait_event_interruptible_timeout(), originally defined in <linux/wait.h>
+ */
+
+#define wait_event_freezable(wq, condition)				\
+({									\
+	int __retval;							\
+	do {								\
+		__retval = wait_event_interruptible(wq, 		\
+				(condition) || freezing(current));	\
+		if (__retval && !freezing(current))			\
+			break;						\
+		else if (!(condition))					\
+			__retval = -ERESTARTSYS;			\
+	} while (try_to_freeze());					\
+	__retval;							\
+})
+
+
+#define wait_event_freezable_timeout(wq, condition, timeout)		\
+({									\
+	long __retval = timeout;					\
+	do {								\
+		__retval = wait_event_interruptible_timeout(wq,		\
+				(condition) || freezing(current),	\
+				__retval); 				\
+	} while (try_to_freeze());					\
+	__retval;							\
+})
+#else /* !CONFIG_FREEZER */
 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 void set_freeze_flag(struct task_struct *p) {}
+static inline void clear_freeze_flag(struct task_struct *p) {}
 static inline int thaw_process(struct task_struct *p) { return 1; }
 
 static inline void refrigerator(void) {}
@@ -142,6 +177,14 @@ static inline void freezer_do_not_count(void) {}
 static inline void freezer_count(void) {}
 static inline int freezer_should_skip(struct task_struct *p) { return 0; }
 static inline void set_freezable(void) {}
-#endif
+static inline void set_freezable_with_signal(void) {}
+
+#define wait_event_freezable(wq, condition)				\
+		wait_event_interruptible(wq, condition)
+
+#define wait_event_freezable_timeout(wq, condition, timeout)		\
+		wait_event_interruptible_timeout(wq, condition, timeout)
+
+#endif /* !CONFIG_FREEZER */
 
 #endif	/* FREEZER_H_INCLUDED */