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-rw-r--r--config.hin5
1 files changed, 5 insertions, 0 deletions
diff --git a/config.hin b/config.hin
index f191f7b2f..20fa12f02 100644
--- a/config.hin
+++ b/config.hin
@@ -1410,6 +1410,11 @@
<sys/cpustats.h>. */
#undef UMAX4_3
+/* Define to 1 if you want getc etc. to use unlocked I/O if available.
+ Unlocked I/O can improve performance in unithreaded apps, but it is not
+ safe for multithreaded apps. */
+#undef USE_UNLOCKED_IO
+
/* Version number of package */
#undef VERSION