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-rw-r--r--internal/thread.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/internal/thread.h b/internal/thread.h
index 919ad96580..c7fe16eb6b 100644
--- a/internal/thread.h
+++ b/internal/thread.h
@@ -28,6 +28,7 @@ VALUE rb_get_coverages(void);
int rb_get_coverage_mode(void);
VALUE rb_default_coverage(int);
VALUE rb_thread_shield_new(void);
+bool rb_thread_shield_owned(VALUE self);
VALUE rb_thread_shield_wait(VALUE self);
VALUE rb_thread_shield_release(VALUE self);
VALUE rb_thread_shield_destroy(VALUE self);