waitFor functions
diff --git a/util.go b/util.go
new file mode 100644
index 0000000..c424759
--- /dev/null
+++ b/util.go
@@ -0,0 +1,22 @@
+package gophercloud
+
+import (
+ "fmt"
+ "time"
+)
+
+// WaitFor polls a predicate function once per second up to secs times to wait for a certain state to arrive.
+func WaitFor(secs int, predicate func() (bool, error)) error {
+ for i := 0; i < secs; i++ {
+ time.Sleep(1 * time.Second)
+
+ satisfied, err := predicate()
+ if err != nil {
+ return err
+ }
+ if satisfied {
+ return nil
+ }
+ }
+ return fmt.Errorf("Time out in WaitFor.")
+}