1 files changed, 28 insertions, 0 deletions
diff --git a/database/engine/rrdenginelib.h b/database/engine/rrdenginelib.h
index 1184358f63..ebab93c8fe 100644
--- a/database/engine/rrdenginelib.h
+++ b/database/engine/rrdenginelib.h
@@ -36,6 +36,34 @@ typedef uintptr_t rrdeng_stats_t;
 
 #define rrd_stat_atomic_add(p, n) rrd_atomic_fetch_add(p, n)
 
+/* returns -1 if it didn't find the first cleared bit, the position otherwise. Starts from LSB. */
+static inline int find_first_zero(unsigned x)
+{
+    return ffs((int)(~x)) - 1;
+}
+
+/* Starts from LSB. */
+static inline uint8_t check_bit(unsigned x, size_t pos)
+{
+    return !!(x & (1 << pos));
+}
+
+/* Starts from LSB. val is 0 or 1 */
+static inline void modify_bit(unsigned *x, unsigned pos, uint8_t val)
+{
+    switch(val) {
+    case 0:
+        *x &= ~(1U << pos);
+        break;
+    case 1:
+        *x |= 1U << pos;
+        break;
+    default:
+        error("modify_bit() called with invalid argument.");
+        break;
+    }
+}
+
 #define RRDENG_PATH_MAX (4096)
 
 /* returns old *ptr value */