[ECOS] Two threads -two messages - one mbox

[Matthias Gorjup <gorjup at norik dot com>]

Hello,

I am having problems with sending more than on mbox-meassage in one 
loop-iteration from one thread to another. Below is the code we are using:

cyg_handle_t mbox_handle;
void *sock_msb;
#define THREAD1_NAME "Thread1"
#define THREAD2_NAME "Thread2"
unsigned char THREAD1_STACK[0x2000];
unsigned char THREAD2_STACK[0x2000];
static cyg_handle_t THREAD1_Handle;
static cyg_handle_t THREAD2_Handle;
static cyg_thread   THREAD1_Thread;
static cyg_thread   THREAD2_Thread;

int message1;
int message2;

void main()
{

    cyg_thread_create(20,
                      Thread1,
                      (cyg_addrword_t)0,
                      RPC_THREAD1_NAME,
                      (void *)THREAD1_STACK,
                      0x2000,
                      &THREAD1_Handle,
                      &THREAD1_Thread);

    cyg_thread_resume(THREAD1_Handle); // start thread 1

    cyg_thread_create(22,
                      Thread2, // CBFTask
                      (cyg_addrword_t)0,
                      RPC_THREAD2_NAME,
                      (void *)RPC_THREAD2_STACK,
                      0x2000,
                      &THREAD2_Handle,
                      &THREAD2_Thread);

    cyg_thread_resume(RPC_CB_TASK_Handle); // start thread 2

     cyg_mbox_create(&mbox_handle,sock_msb);

}

void Thread1(void)
{
	while (1)
	{
		cyg_thread_delay(1000);
		cyg_mbox_put(mbox_handle, message1);
		cyg_mbox_put(mbox_handle, message2);
	}
}

void Thread2(void)
{
	void *msg;
	while(1)
	{
		cyg_mbox_get(mbox_handle, );
		cyg_mbox_get(mbox_handle, );
	}
}

If I only send one message and read one mesage, the code works fine. But if I 
send two messages in one iteration, the system reboots after the first 
iteration of the sending thread.

I must say that I need to send two integer values from one thread to another 
during one iteration and the other thread needs to read both of them in one 
iteration as well.

What could be wrong?
Should I use a global structure with two integer elements and then send only a 
pointer to that structure (this would make it possible to send only one 
message in one iteration)?
Should I use mutex-es or some other synchronizaiton mechanism?

Thank you all for your time

Matthias Gorjup
 
-- 
Matthias Gorjup
Norik Systems
www.norik.com
Tel: + 386 41 540 545
Tel: + 386 3 759 3077
Fax: + 386 3 759 3078


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