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-rw-r--r--libguile/threads.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libguile/threads.h b/libguile/threads.h
index 89e3b0238..9ce04e1ff 100644
--- a/libguile/threads.h
+++ b/libguile/threads.h
@@ -56,6 +56,7 @@ typedef struct scm_i_thread {
scm_i_pthread_mutex_t admin_mutex;
SCM mutexes;
+ scm_i_pthread_mutex_t *held_mutex;
SCM result;
int canceled;