1 files changed, 13 insertions, 0 deletions
diff --git a/include/ruby/thread.h b/include/ruby/thread.h
index 337f477fd0..7cbefc9777 100644
--- a/include/ruby/thread.h
+++ b/include/ruby/thread.h
@@ -59,6 +59,19 @@
  */
 #define RB_NOGVL_UBF_ASYNC_SAFE  (0x2)
 
+/**
+ * Passing  this  flag   to  rb_nogvl()  indicates  that  the   passed function
+ * is safe to offload to a background thread or work pool. In other words, the
+ * function is safe to run using a fiber scheduler's `blocking_operation_wait`.
+ * hook.
+ *
+ * If your function depends on thread-local storage, or thread-specific data
+ * operations/data structures, you should not set this flag, as
+ * these operations may behave differently (or fail) when run in a different
+ * thread/context (e.g. unlocking a mutex).
+ */
+#define RB_NOGVL_OFFLOAD_SAFE  (0x4)
+
 /** @} */
 
 RBIMPL_SYMBOL_EXPORT_BEGIN()