Hello,I am having problems of simultaneous reading and writing to a TCP
socket with LwIP, FreeRTOS, AVR32 (EWK1100).I know that lwip_write() and
lwip_read() calls are not threadsafe and I have seen a lot of other forum
threads discussing this and the use semaphores of lwip_select(). - I do not
think this is the problem here.I have boiled down my program to only have
one thread with one lwip_write() call and one delay of app. 1msec. (No
lwip_read() call !). (See source code below.)When I connect a terminal
program from a PC, it will start receiving the messages. When sending a few
messages (Just pressing ENTER) from the terminal program to the AVR32, it
will make the transmission from the AVR pause for exactly 10 sec. - Then
resume. this can be repeated a number of time whereafter transmission
completely stops.I have traced down the 10sec pause to be in api_lib.c,
netconn_write(), sys_mbox_fetch(conn->mbox, NULL); call.A WireShark
recording is attached. The problem appear at time: 20.147 and again at
34.903. LwIP_ReadWrite.pcapng
<http://lwip.100.n7.nabble.com/file/t2115/LwIP_ReadWrite.pcapng> Anyone
knows of a fix, that can make the system keep transmitting messages while
other messages are being transmitted in the other direction ?Thank
you.Source code:static portTASK_FUNCTION( shellTask, pvParameters ){ int
sock, sock2, status, j; struct sockaddr_in sockAddr;
sockAddr.sin_family = AF_INET; sockAddr.sin_len =
sizeof(sockAddr); sockAddr.sin_port = htons(6001);
sockAddr.sin_addr.s_addr = htonl(INADDR_ANY); sock = lwip_socket
(AF_INET, SOCK_STREAM, 0); lwip_bind (sock, (struct sockaddr*)
&sockAddr, sizeof(struct sockaddr_in)); lwip_listen (sock, 1); sock2 =
lwip_accept (sock, (struct sockaddr*) &sockAddr, &status); while (1)
{ lwip_write(sock2, "Hello\r", 6); for (j=0; j < 10000;j++); }}
--
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