1 files changed, 4 insertions, 0 deletions
diff --git a/vm_core.h b/vm_core.h
index 1d869617b6..88dc905a77 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -1838,6 +1838,10 @@ void rb_fiber_close(rb_fiber_t *fib);
 void Init_native_thread(rb_thread_t *th);
 int rb_vm_check_ints_blocking(rb_execution_context_t *ec);
 
+// vm_sync.h
+void rb_vm_cond_wait(rb_vm_t *vm, rb_nativethread_cond_t *cond);
+void rb_vm_cond_timedwait(rb_vm_t *vm, rb_nativethread_cond_t *cond, unsigned long msec);
+
 #define RUBY_VM_CHECK_INTS(ec) rb_vm_check_ints(ec)
 static inline void
 rb_vm_check_ints(rb_execution_context_t *ec)