Unexpected exit from threads - added comments

Unexpected exit from threads - added comments

[David Luca]

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Note: forwarded message attached.



 
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From: David Luca <davidluca3000@yahoo.com>
To: David Luca <davidluca3000@yahoo.com>
Subject: Re: Unexpected exit from threads
Date: Thu, 23 Nov 2006 00:44:58 -0800 (PST)

I must mention that the threads exits when executing
cyg_thread_delay function.

--- David Luca <davidluca3000@yahoo.com> wrote:

> Hello,
> 
> I tried the example found in twothreads.c, but
> renamed
> the file to hello.cpp to compile it with g++.
> I commented the printf calls and replaced with
> lighting led functions. The code looks like:
> 
> void Led(int led)
> {
> 	int j;
> 	for(j=0;j<100000;j++)
>     	GPIO_clr(led);
> 	for(j=0;j<100000;j++)
>     	GPIO_set(led);
> 
> }
> 
> /* now declare (and allocate space for) some kernel
> objects,
>    like the two threads we will use */
> cyg_thread thread_s[2];		/* space for two thread
> objects */
> 
> char stack[2][4096];		/* space for two 4K stacks */
> 
> /* now the handles for the threads */
> cyg_handle_t simple_threadA, simple_threadB;
> 
> /* and now variables for the procedure which is the
> thread */
> cyg_thread_entry_t simple_program;
> 
> /* and now a mutex to protect calls to the C library
> */
> cyg_mutex_t cliblock;
> 
> #ifdef __cplusplus
> extern "C"{
> #endif
> 
> void _impure_ptr()//required for C++ new operator
> {
> }
> /* we install our own startup routine which sets up
> threads */
> 
> void cyg_user_start(void)
> {
> //  printf("Entering twothreads' cyg_user_start()
> function\n");
> 
>   cyg_mutex_init(&cliblock);
> 
>   cyg_thread_create(4, simple_program,
> (cyg_addrword_t) USR_LED0, "Thread A", (void *)
> stack[0], 4096,   &simple_threadA, &thread_s[0]);
>   cyg_thread_create(4, simple_program,
> (cyg_addrword_t) USR_LED1, "Thread B", (void *)
> stack[1], 4096, &simple_threadB, &thread_s[1]);
> 
>   cyg_thread_resume(simple_threadA);
>   cyg_thread_resume(simple_threadB);
> }
> 
> #ifdef __cplusplus
> };//extern "C"{
> #endif
> /* this is a simple program which runs in a thread
> */
> void simple_program(cyg_addrword_t data)
> {
>   int message = (int) data;
>   int delay;
> 
> //  printf("Beginning execution; thread data is
> %d\n",
> message);
> 
> //  cyg_thread_delay(200);
> 
>   for (;;)
> 	{
>     delay = 200 + (rand() % 50);
> 
>     /* note: printf() must be protected by a
>        call to cyg_mutex_lock() */
>     cyg_mutex_lock(&cliblock);
> 		{
> 		Led(message);	//light up/down led in 2 tasks
> //      printf("Thread %d: and now a delay of %d
> clock
> ticks\n",
> //	     message, delay);
>     	}
>     cyg_mutex_unlock(&cliblock);
>     cyg_thread_delay(delay);
>   	}
> }
> 
> When I run this example, I can see that each of the
> 2
> leds are lit, then the threads exits without
> continuing. Is there something wrong with the
> scheduler? The platform used is based on Agilent
> AAED2000 (Arm920). If you have any ideas, please
> inform me. Thank you in advance,
> David Luca.
> 
> 
>  
>
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