hopefully this will be it for coding style

src/parallel.c

@@ -5,6 +5,7 @@
 #include <unistd.h>
 #include <sys/types.h>
 #include <time.h>
+#include <pthread.h>
 
 #include "os_graph.h"
 #include "os_threadpool.h"
@@ -17,10 +18,6 @@ static int sum;
 static os_graph_t *graph;
 static os_threadpool_t *tp;
 /* TODO: Define graph synchronization mechanisms. */
-#include <pthread.h>
-
-//static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
-
 /* TODO: Define graph task argument. */
 
 static void process_node(unsigned int idx)