diff --git a/util.h b/util.h
index c4496bd1..291a68d7 100644
--- a/util.h
+++ b/util.h
@@ -1,5 +1,23 @@
 #pragma once
 
+#include <threads.h>
+
 #define ALEN(v) (sizeof(v) / sizeof((v)[0]))
 #define min(x, y) ((x) < (y) ? (x) : (y))
 #define max(x, y) ((x) > (y) ? (x) : (y))
+
+static inline const char *
+thrd_err_as_string(int thrd_err)
+{
+    switch (thrd_err) {
+    case thrd_success:   return "success";
+    case thrd_busy:     return "busy";
+    case thrd_nomem:    return "no memory";
+    case thrd_timedout: return "timedout";
+
+    case thrd_error:
+    default:            return "unknown error";
+    }
+
+    return "unknown error";
+}