1 files changed, 11 insertions, 0 deletions
diff --git a/src/rt/rust_internal.h b/src/rt/rust_internal.h
index d962e894..99f52165 100644
--- a/src/rt/rust_internal.h
+++ b/src/rt/rust_internal.h
@@ -67,6 +67,17 @@ struct frame_glue_fns;
 
 static size_t const TIME_SLICE_IN_MS = 10;
 
+// This helps our preemption scheme handle "running on valgrind".
+
+#if defined(__WIN32__)
+#define YIELD_C_THREAD_IF_ON_VALGRIND (void);
+#else
+#define YIELD_C_THREAD_IF_ON_VALGRIND  \
+    if (RUNNING_ON_VALGRIND) {         \
+        pthread_yield();               \
+    }
+#endif
+
 // Every reference counted object should derive from this base class.
 
 template <typename T>