This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / linux / freezer.h

diff --git a/include/linux/freezer.h b/include/linux/freezer.h
new file mode 100644 (file)
index 0000000..5e75e26
--- /dev/null
+++ b/include/linux/freezer.h
@@ -0,0 +1,90 @@
+/* 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