b=23289 new API: cfs_waitq_add_exclusive_head

[fs/lustre-release.git] / libcfs / include / libcfs / libcfs_prim.h

diff --git a/libcfs/include/libcfs/libcfs_prim.h b/libcfs/include/libcfs/libcfs_prim.h
index 1bbf943..03da8fe 100644 (file)
--- a/libcfs/include/libcfs/libcfs_prim.h
+++ b/libcfs/include/libcfs/libcfs_prim.h
@@ -65,6 +65,8 @@ void cfs_waitlink_init(cfs_waitlink_t *link);
 void cfs_waitq_add(cfs_waitq_t *waitq, cfs_waitlink_t *link);
 void cfs_waitq_add_exclusive(cfs_waitq_t *waitq,
                              cfs_waitlink_t *link);
+void cfs_waitq_add_exclusive_head(cfs_waitq_t *waitq,
+                                  cfs_waitlink_t *link);
 void cfs_waitq_del(cfs_waitq_t *waitq, cfs_waitlink_t *link);
 int  cfs_waitq_active(cfs_waitq_t *waitq);
 void cfs_waitq_signal(cfs_waitq_t *waitq);
@@ -86,4 +88,35 @@ void cfs_timer_arm(cfs_timer_t *t, cfs_time_t deadline);
 void cfs_timer_disarm(cfs_timer_t *t);
 int  cfs_timer_is_armed(cfs_timer_t *t);
 cfs_time_t cfs_timer_deadline(cfs_timer_t *t);
+
+/*
+ * Memory
+ */
+#ifndef cfs_memory_pressure_get
+#define cfs_memory_pressure_get() (0)
+#endif
+#ifndef cfs_memory_pressure_set
+#define cfs_memory_pressure_set() do {} while (0)
+#endif
+#ifndef cfs_memory_pressure_clr
+#define cfs_memory_pressure_clr() do {} while (0)
+#endif
+
+static inline int cfs_memory_pressure_get_and_set(void)
+{
+        int old = cfs_memory_pressure_get();
+
+        if (!old)
+                cfs_memory_pressure_set();
+        return old;
+}
+
+static inline void cfs_memory_pressure_restore(int old)
+{
+        if (old)
+                cfs_memory_pressure_set();
+        else
+                cfs_memory_pressure_clr();
+        return;
+}
 #endif