kernel: msg: implement asynchronous event messages

kernel/channel.c

@@ -98,11 +98,18 @@ static struct msg *get_next_msg(
 	while (cur) {
 		struct msg *msg = BTREE_CONTAINER(struct msg, msg_node, cur);
 		spin_lock_irqsave(&msg->msg_lock, lock_flags);
-		if (msg->msg_status == KMSG_WAIT_RECEIVE) {
+		switch (msg->msg_status) {
+		case KMSG_WAIT_RECEIVE:
 			msg->msg_status = KMSG_WAIT_REPLY;
 			msg->msg_sender_port->p_status = PORT_REPLY_BLOCKED;
 			channel->c_msg_waiting--;
 			return msg;
+		case KMSG_ASYNC:
+			btree_delete(&channel->c_msg, &msg->msg_node);
+			channel->c_msg_waiting--;
+			return msg;
+		default:
+			break;
 		}
 
 		spin_unlock_irqrestore(&msg->msg_lock, *lock_flags);
@@ -146,24 +153,22 @@ extern kern_status_t channel_recv_msg(
 			&channel->c_base,
 			CHANNEL_SIGNAL_MSG_RECEIVED);
 	}
-#if 0
-	wait_item_init(&waiter, self);
-	for (;;) {
-		thread_wait_begin(&waiter, &channel->c_wq);
-		msg = get_next_msg(channel, &msg_lock_flags);
-		if (msg) {
-			break;
-		}
-
-		object_unlock_irqrestore(&channel->c_base, *irq_flags);
-		schedule(SCHED_NORMAL);
-		object_lock_irqsave(&channel->c_base, irq_flags);
-	}
-	thread_wait_end(&waiter, &channel->c_wq);
-#endif
 
 	/* msg is now set to the next message to process */
 
+	if (msg->msg_type != KERN_MSG_TYPE_DATA) {
+		/* event messages as asynchronous */
+		out_msg->msg_id = msg->msg_id;
+		out_msg->msg_type = msg->msg_type;
+		out_msg->msg_event = msg->msg_event;
+		out_msg->msg_sender = msg->msg_sender_thread->tr_parent->t_id;
+		out_msg->msg_endpoint = msg->msg_sender_port->p_base.ob_id;
+		spin_unlock_irqrestore(&msg->msg_lock, msg_lock_flags);
+		msg_free(msg);
+
+		return KERN_OK;
+	}
+
 	struct task *sender = msg->msg_sender_thread->tr_parent;
 	struct task *receiver = self->tr_parent;
 
@@ -218,6 +223,7 @@ extern kern_status_t channel_recv_msg(
 	}
 
 	out_msg->msg_id = msg->msg_id;
+	out_msg->msg_type = msg->msg_type;
 	out_msg->msg_sender = msg->msg_sender_thread->tr_parent->t_id;
 	out_msg->msg_endpoint = msg->msg_sender_port->p_base.ob_id;
 

kernel/msg.c

@@ -0,0 +1,22 @@
+#include <kernel/msg.h>
+#include <kernel/vm.h>
+
+static struct vm_cache msg_cache = {
+	.c_name = "msg",
+	.c_obj_size = sizeof(struct msg),
+};
+
+void msg_init(void)
+{
+	vm_cache_init(&msg_cache);
+}
+
+struct msg *msg_alloc(void)
+{
+	return vm_cache_alloc(&msg_cache, VM_NORMAL);
+}
+
+void msg_free(struct msg *msg)
+{
+	vm_cache_free(&msg_cache, msg);
+}

kernel/port.c

@@ -1,16 +1,29 @@
 #include <kernel/channel.h>
 #include <kernel/port.h>
+#include <kernel/printk.h>
 #include <kernel/thread.h>
 #include <kernel/util.h>
 
 #define PORT_CAST(p) OBJECT_C_CAST(struct port, p_base, &port_type, p)
 
+static kern_status_t port_cleanup(struct object *obj);
+
 static struct object_type port_type = {
 	.ob_name = "port",
 	.ob_size = sizeof(struct port),
 	.ob_header_offset = offsetof(struct port, p_base),
+	.ob_ops = {
+		.destroy = port_cleanup,
+	},
 };
 
+static kern_status_t port_cleanup(struct object *obj, struct queue *q)
+{
+	struct port *port = PORT_CAST(obj);
+	port_disconnect(port);
+	return KERN_OK;
+}
+
 kern_status_t port_type_init(void)
 {
 	return object_type_register(&port_type);
@@ -58,9 +71,26 @@ struct port *port_create(void)
 kern_status_t port_connect(struct port *port, struct channel *remote)
 {
 	if (port->p_status != PORT_OFFLINE) {
+		tracek("port_connect: port in bad state (%d)", port->p_status);
 		return KERN_BAD_STATE;
 	}
 
+	struct msg *msg = msg_alloc();
+	if (!msg) {
+		return KERN_NO_MEMORY;
+	}
+
+	msg->msg_status = KMSG_ASYNC;
+	msg->msg_type = KERN_MSG_TYPE_EVENT;
+	msg->msg_event = KERN_MSG_EVENT_CONNECTION;
+	msg->msg_sender_thread = current_thread();
+	msg->msg_sender_port = port;
+
+	unsigned long flags;
+	channel_lock_irqsave(remote, &flags);
+	channel_enqueue_msg(remote, msg);
+	channel_unlock_irqrestore(remote, flags);
+
 	port->p_remote = remote;
 	port->p_status = PORT_READY;
 	return KERN_OK;
@@ -69,9 +99,27 @@ kern_status_t port_connect(struct port *port, struct channel *remote)
 kern_status_t port_disconnect(struct port *port)
 {
 	if (port->p_status != PORT_READY) {
+		tracek("port_disconnect: port in bad state (%d)",
+		       port->p_status);
 		return KERN_BAD_STATE;
 	}
 
+	struct msg *msg = msg_alloc();
+	if (!msg) {
+		return KERN_NO_MEMORY;
+	}
+
+	msg->msg_status = KMSG_ASYNC;
+	msg->msg_type = KERN_MSG_TYPE_EVENT;
+	msg->msg_event = KERN_MSG_EVENT_DISCONNECTION;
+	msg->msg_sender_thread = current_thread();
+	msg->msg_sender_port = port;
+
+	unsigned long flags;
+	channel_lock_irqsave(port->p_remote, &flags);
+	channel_enqueue_msg(port->p_remote, msg);
+	channel_unlock_irqrestore(port->p_remote, flags);
+
 	port->p_remote = NULL;
 	port->p_status = PORT_OFFLINE;
 	return KERN_OK;
@@ -84,12 +132,14 @@ kern_status_t port_send_msg(
 	unsigned long *lock_flags)
 {
 	if (port->p_status != PORT_READY) {
+		tracek("port_send_msg: port in bad state (%d)", port->p_status);
 		return KERN_BAD_STATE;
 	}
 
 	struct thread *self = current_thread();
 	struct msg msg;
 	memset(&msg, 0x0, sizeof msg);
+	msg.msg_type = KERN_MSG_TYPE_DATA;
 	msg.msg_status = KMSG_WAIT_RECEIVE;
 	msg.msg_sender_thread = self;
 	msg.msg_sender_port = port;