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