transport.cpp File Reference

Layer 4 (Transport) — TCP connection management implementation. More...

#include "transport.h"
#include "freertos/FreeRTOS.h"
#include "freertos/queue.h"
#include "lwip/tcp.h"

Go to the source code of this file.

Variables
TcpConn	conn_pool [MAX_CONNS]
	Static pool of connection contexts. Defined in transport.cpp.

Detailed Description

Layer 4 (Transport) — TCP connection management implementation.

All lwIP raw-API callbacks run in the tcpip_thread FreeRTOS task context. They are NOT hardware ISRs, which is why we use xQueueSend() (non-ISR variant) with timeout=0 rather than xQueueSendFromISR().

Ring buffer write ordering The producer (recv callback) writes payload bytes into rx_buffer[] and then advances rx_head. The consumer (main loop) reads from rx_buffer[] at rx_tail and advances rx_tail. Because Xtensa LX7 stores are in-order and rx_head/rx_tail are volatile, no memory barriers are needed beyond the volatile annotation.

Definition in file transport.cpp.

Variable Documentation

conn_pool

TcpConn conn_pool[MAX_CONNS]

Static pool of connection contexts. Defined in transport.cpp.

Definition at line 25 of file transport.cpp.

Referenced by DeterministicAsyncTCP::check_timeouts(), http_parse(), DeterministicAsyncTCP::init(), DetWebServer::send(), DetWebServer::send_empty(), sse_write(), DeterministicAsyncTCP::stop(), ws_close(), ws_parse(), and ws_send_frame().