1 files changed, 3 insertions, 0 deletions
diff --git a/vm_core.h b/vm_core.h
index fffaa5e986..333e845607 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -584,6 +584,9 @@ typedef struct rb_thread_struct {
     void *altstack;
 #endif
     unsigned long running_time_us;
+
+    /* 1 if running trap handler */
+    int in_trap;
 } rb_thread_t;
 
 /* iseq.c */