Functions
void	esphome_lwip_fast_select_init (void)
	Initialize fast select — must be called from the main loop task during setup().

bool	esphome_lwip_socket_has_data (int fd)
	Check if a LwIP socket has data ready via direct rcvevent read (~215 ns per socket).

void	esphome_lwip_hook_socket (int fd)
	Hook a socket's netconn callback to notify the main loop task on receive events.

void	esphome_lwip_wake_main_loop (void)
	Wake the main loop task from another FreeRTOS task — costs <1 us.

void	esphome_lwip_wake_main_loop_from_isr (int *px_higher_priority_task_woken)
	Wake the main loop task from an ISR — costs <1 us.

void	esphome_lwip_wake_main_loop_any_context (void)
	Wake the main loop task from any context (ISR, thread, or main loop).

Function Documentation

◆ esphome_lwip_fast_select_init()

void esphome_lwip_fast_select_init ( void )

Initialize fast select — must be called from the main loop task during setup().

Saves the current task handle for xTaskNotifyGive() wake notifications.

Definition at line 180 of file lwip_fast_select.c.

◆ esphome_lwip_hook_socket()

void esphome_lwip_hook_socket ( int fd )

Hook a socket's netconn callback to notify the main loop task on receive events.

Wraps the original event_callback with one that also calls xTaskNotifyGive(). Must be called from the main loop after socket creation.

Definition at line 209 of file lwip_fast_select.c.

◆ esphome_lwip_socket_has_data()

bool esphome_lwip_socket_has_data ( int fd )

Check if a LwIP socket has data ready via direct rcvevent read (~215 ns per socket).

Uses lwip_socket_dbg_get_socket() — a direct array lookup without the refcount that get_socket()/done_socket() uses. Safe because the caller owns the socket lifetime: both has_data reads and socket close/unregister happen on the main loop thread.

Definition at line 197 of file lwip_fast_select.c.

◆ esphome_lwip_wake_main_loop()

void esphome_lwip_wake_main_loop ( void )

Wake the main loop task from another FreeRTOS task — costs <1 us.

NOT ISR-safe — must only be called from task context.

Definition at line 226 of file lwip_fast_select.c.

◆ esphome_lwip_wake_main_loop_any_context()

void esphome_lwip_wake_main_loop_any_context ( void )

Wake the main loop task from any context (ISR, thread, or main loop).

ESP32-only: uses xPortInIsrContext() to detect ISR context. LibreTiny lacks IRAM_ATTR support needed for ISR-safe paths.

Definition at line 245 of file lwip_fast_select.c.

◆ esphome_lwip_wake_main_loop_from_isr()

void esphome_lwip_wake_main_loop_from_isr ( int * px_higher_priority_task_woken )

Wake the main loop task from an ISR — costs <1 us.

ISR-safe variant using vTaskNotifyGiveFromISR().

Parameters

px_higher_priority_task_woken Set to pdTRUE if a context switch is needed.

Definition at line 234 of file lwip_fast_select.c.