initial check-in, version 0.5.0

src/thread/pthread_barrier_init.c

@@ -0,0 +1,8 @@
+#include "pthread_impl.h"
+
+int pthread_barrier_init(pthread_barrier_t *b, const pthread_barrierattr_t *a, unsigned count)
+{
+	if (!count) return EINVAL;
+	*b = (pthread_barrier_t){ .__limit = count-1 };
+	return 0;
+}