1 files changed, 18 insertions, 0 deletions
diff --git a/retry.go b/retry.go
new file mode 100644
index 0000000..7800ae9
--- /dev/null
+++ b/retry.go
@@ -0,0 +1,18 @@
+package stm
+
+// Retry is a sentinel value. When thrown via panic, it indicates that a
+// transaction should be retried.
+const Retry = "retry"
+
+// catchRetry returns true if fn calls tx.Retry.
+func catchRetry(fn func(*Tx), tx *Tx) (retry bool) {
+	defer func() {
+		if r := recover(); r == Retry {
+			retry = true
+		} else if r != nil {
+			panic(r)
+		}
+	}()
+	fn(tx)
+	return
+}