enable unlocked I/O by default

getchar_unlocked is part of POSIX and should be supported by most platforms. On
all tested platforms it has a performance benefit, sometimes smallish (<12%),
sometimes large (~40%).

2 files changed, 5 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index d738559..f79b9da 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,10 @@ SFEED_CFLAGS = ${CFLAGS}
 SFEED_LDFLAGS = ${LDFLAGS}
 SFEED_CPPFLAGS = -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -D_BSD_SOURCE
 
+# uncomment for convervative locked I/O.
+#SFEED_CPPFLAGS = -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -D_BSD_SOURCE \
+#	-DGETNEXT=getchar
+
 BIN = \
 	sfeed\
 	sfeed_atom\
diff --git a/xml.h b/xml.h
index 7b6bd35..ad53396 100644
--- a/xml.h
+++ b/xml.h
@@ -24,7 +24,7 @@ typedef struct xmlparser {
 #ifndef GETNEXT
 	/* GETNEXT overridden to reduce function call overhead and further
 	   context optimizations. */
-	#define GETNEXT getchar
+	#define GETNEXT getchar_unlocked
 #endif
 
 	/* current tag */