kernel: add header files

include/kernel/msg.h

@@ -0,0 +1,30 @@
+#ifndef KERNEL_MSG_H_
+#define KERNEL_MSG_H_
+
+#include <kernel/btree.h>
+#include <kernel/locks.h>
+#include <mango/status.h>
+#include <mango/types.h>
+
+struct port;
+struct thread;
+
+enum kmsg_status {
+	KMSG_WAIT_RECEIVE,
+	KMSG_WAIT_REPLY,
+	KMSG_REPLY_SENT,
+};
+
+struct kmsg {
+	spin_lock_t msg_lock;
+	enum kmsg_status msg_status;
+	struct btree_node msg_node;
+	msgid_t msg_id;
+	kern_status_t msg_result;
+	struct port *msg_sender_port;
+	struct thread *msg_sender_thread;
+	const struct msg *msg_req;
+	struct msg *msg_resp;
+};
+
+#endif