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diff --git a/libgc/include/gc.h b/libgc/include/gc.h
index ef3a06c11f5..d77de303e0d 100644
--- a/libgc/include/gc.h
+++ b/libgc/include/gc.h
@@ -424,6 +424,10 @@ GC_API size_t GC_get_bytes_since_gc GC_PROTO((void));
 /* Never decreases, except due to wrapping.				*/
 GC_API size_t GC_get_total_bytes GC_PROTO((void));
 
+/* Return the signal used by the gc to suspend threads on posix platforms. */
+/* Return -1 otherwise. */
+int GC_get_suspend_signal GC_PROTO((void));
+
 /* Disable garbage collection.  Even GC_gcollect calls will be 		*/
 /* ineffective.								*/
 GC_API void GC_disable GC_PROTO((void));