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False alarm people.Yes, I too ran into that problem, and floundered until I realized that cyg_user_start *must* be a "C" symbol as it's called from C code.
My Makefile was screwed up! I had the .cc target defined (copy-paste error)...because of which it was using "CC" to compile my program and using i386-elf to link it.
I guess this explains the weired behavior!
Sorry if I wasted anybody's time! :P
Thanks, -mandeep
On Mon, Aug 3, 2009 at 4:42 PM, Mandeep
Sandhu<mandeepsandhu.chd@gmail.com> wrote:
Just to add to the rest of the info, I'm using i386-elf (that comes with ecos) to compile my program.
I have another program that too has a single thread and it uses TWO struct sockaddr_in var's. That program works just fine!
Running strace on the prog shows a lot of Seg faults happening. I'm pretty clueless right now as to why one works while the other does not! :(
-mandeep
On Mon, Aug 3, 2009 at 2:53 PM, Mandeep
Sandhu<mandeepsandhu.chd@gmail.com> wrote:
Hi All,
I have a _very_ simple thread app which I've modified from the "twothreads.c" example.
It does nothing except start a thread in which I simply print a debug message and declare a var of "struct sockaddr_in". But on starting the app, it stops after a call to cyg_thread_resume(), i.e the thread does not start!
I had originally written a limited DHCP server implementation (which was not working)! So on debugging I narrowed down the problem to a declaration of "struct sockaddr_in" variable.
So I thought I'd make a simple thread which just declares this var and does nothing. And even in this sample app (test.c) I saw the same problem. I've allocated a big enough stack for the thread - 4KB. Also, increasing the stack size does not help. The source is pasted below.
I know this is only some minor oversight from my side, but any pointers will be very helpful
Thanks, -mandeep
test.c:
#include <cyg/kernel/kapi.h> #include <network.h>
cyg_thread test_s; cyg_handle_t test_thread; cyg_thread_entry_t test_start; char stack[4096];
void test_start(cyg_addrword_t data) { diag_printf("TEST!\n"); struct sockaddr_in addr; cyg_test_exit(); }
void cyg_user_start(void) { diag_printf("Configuring test thread...\n"); cyg_thread_create( 4, test_start, (cyg_addrword_t) 0, "TEST Thread", (void *) &stack, 4096, &test_thread, &test_s );
diag_printf("Starting test...\n"); cyg_thread_resume(test_thread); }
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