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-rw-r--r--libguile/threads.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/libguile/threads.h b/libguile/threads.h
index 3e16fbbcd..89a701075 100644
--- a/libguile/threads.h
+++ b/libguile/threads.h
@@ -69,6 +69,8 @@ typedef struct scm_i_thread {
*/
SCM freelist, freelist2;
int clear_freelists_p; /* set if GC was done while thread was asleep */
+ int gc_running_p; /* non-zero while this thread does GC or a
+ sweep. */
/* Other thread local things.
*/