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+lwip/api/tcpip.c: tcpip_init -> tcpip_thread
+
+lwip/core/netif.c: netif_add
+lwip/arch/lpc17_emac.c: lpc_enetif_init -> packet_rx, packet_tx
+
+=== tcpip_thread ===
+ while (true):
+ sys_timeouts_mbox_fetch(&mbox, (void **)&msg)
+ ...
+
+Feeding the tcpip_thread mbox:
+ tcpip_input
+ tcpip_callback_with_block
+ tcpip_timeout
+ tcpip_untimeout
+ tcpip_apimsg
+ tcpip_netifapi
+
+
+=== packet_rx ===
+ while (true):
+ sys_arch_sem_wait(&lpc_enetif->RxSem, osWaitForever)
+ ...
+
+Feeding the RX semaphore:
+ ENET_IRQHandler
+
+
+=== packet_tx ===
+ while (true):
+ sys_arch_sem_wait(&lpc_enetif->TxCleanSem, osWaitForever)
+ ...
+
+Feeding the TX semaphore:
+ ENET_IRQHandler