A node in a doubly-linked channel chain. More...

#include <chann.h>

Public Attributes
asrt_chann_id	chid

asrt_event_callback	e_cb

void *	e_cb_ptr

struct asrt_node *	next

struct asrt_node *	prev

struct asrt_send_req_list *	send_queue

Detailed Description

A node in a doubly-linked channel chain.

Each protocol module (reactor, diag client, param client, …) embeds one asrt_node as its first member. Modules are connected into a chain with asrt_node_link(); the chain is the runtime representation of the protocol stack for one side of the connection.

Events flow through the chain via two mechanisms:

RECV — asrt_chann_cobs_dispatch() decodes incoming bytes from the transport, extracts a channel ID from each frame header, and calls asrt_chann_dispatch() which walks the chain to find the node whose chid matches and delivers the payload to its e_cb. Each node therefore only sees frames addressed to its own channel.

TICK — asrt_chann_tick_successors() calls e_cb(ASRT_EVENT_TICK) on every node after the head. Modules use the tick to advance state machines, check timeouts, and drain their send queue.

The send_queue pointer is shared across all nodes in the chain. Any module that wants to transmit calls asrt_send_enque(), which appends to the shared queue; the transport layer drains it independently.

chid must be unique within a chain — asrt_chann_find() and the dispatch path rely on this to route frames correctly.

The documentation for this struct was generated from the following file:

asrtl/chann.h

Public Attributes

Detailed Description