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-rw-r--r--internal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 0dd93d9860..86181f913a 100644
--- a/internal.h
+++ b/internal.h
@@ -278,6 +278,7 @@ VALUE rb_thread_shield_new(void);
VALUE rb_thread_shield_wait(VALUE self);
VALUE rb_thread_shield_release(VALUE self);
VALUE rb_thread_shield_destroy(VALUE self);
+void rb_mutex_allow_trap(VALUE self, int val);
/* thread_pthread.c, thread_win32.c */
void Init_native_thread(void);