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-rw-r--r--libguile/ports.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libguile/ports.h b/libguile/ports.h
index 56cafdb35..624b7b860 100644
--- a/libguile/ports.h
+++ b/libguile/ports.h
@@ -294,6 +294,7 @@ SCM_API SCM scm_port_conversion_strategy (SCM port);
SCM_API SCM scm_set_port_conversion_strategy_x (SCM port, SCM behavior);
/* Acquiring and releasing the port lock. */
+SCM_API void scm_dynwind_lock_port (SCM port);
SCM_INLINE int scm_c_lock_port (SCM port);
SCM_INLINE int scm_c_try_lock_port (SCM port);
SCM_INLINE int scm_c_unlock_port (SCM port);