1 files changed, 10 insertions, 7 deletions
diff --git a/libglusterfs/src/graph.y b/libglusterfs/src/graph.y
index a640f240215..e0fbd169b91 100644
--- a/libglusterfs/src/graph.y
+++ b/libglusterfs/src/graph.y
@@ -18,6 +18,7 @@
 #include <sys/mman.h>
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <pthread.h>
 
 #define RELAX_POISONING
 
@@ -555,6 +556,7 @@ glusterfs_graph_construct (FILE *fp)
         int                ret = 0;
         glusterfs_graph_t *graph = NULL;
 	FILE              *tmp_file = NULL;
+	static pthread_mutex_t graph_mutex = PTHREAD_MUTEX_INITIALIZER;
 
         graph = glusterfs_graph_new ();
         if (!graph)
@@ -580,13 +582,14 @@ glusterfs_graph_construct (FILE *fp)
 		return NULL;
 	}
 
-        yyin = tmp_file;
-
-        construct = graph;
-
-        ret = yyparse ();
-
-        construct = NULL;
+	pthread_mutex_lock (&graph_mutex);
+	{
+		yyin = tmp_file;
+		construct = graph;
+		ret = yyparse ();
+		construct = NULL;
+	}
+	pthread_mutex_unlock (&graph_mutex);
 
 	fclose (tmp_file);