Protect global data with locks

locked.h

@@ -0,0 +1,12 @@
+#ifndef LOCKED_H_
+#define LOCKED_H_
+
+#include <pthread.h>
+
+#define locked_init(x) { .value = (x), .lock = PTHREAD_MUTEX_INITIALIZER }
+#define locked(T) struct { T value; pthread_mutex_t lock; }
+
+#define lockx(x) pthread_mutex_lock(&(x)->lock)
+#define unlockx(x) pthread_mutex_unlock(&(x)->lock)
+
+#endif // LOCKED_H_