initial check-in, version 0.5.0

src/thread/pthread_attr_setguardsize.c

@@ -0,0 +1,8 @@
+#include "pthread_impl.h"
+
+int pthread_attr_setguardsize(pthread_attr_t *a, size_t size)
+{
+	if (size > SIZE_MAX/8) return EINVAL;
+	a->__guardsize = size - DEFAULT_GUARD_SIZE;
+	return 0;
+}