Hi Olaf,
I know nothing about comedi, but plenty of fp experience.
Remember, a RT thread runs immediately after being created
(pthread_create()) so try to put your pthread_setfp_np into your
thread_code() just before while(1).
Note that kernel's sprintf does not support fp format.
Regards,
pa
On Wed, Sep 27, 2000 at 12:25:33PM +0200, Olaf Petzold wrote:
> Hello,
>
> I want to use a thread for doing some fp ops. The thread is called by a callback
> function (comedi_callback). The problem is, after the thread was created
> the system hangs. Why ? Who has experience (maybe with some code examples)
> with comedi callback?
>
> Thanks Olaf
>
> Here are the code:
>
> void *thread_code(void *param)
> {
> static size_t ctr = 0;
> static char buf[80];
> while(1) {
>
> sprintf(buf, "%10d\n", ctr++);
> rtf_put(1, buf, 11);
> pthread_suspend_np(pthread_self());
> rtl_printf("suspended pthread self\n");
> }
>
> return 0;
> }
>
> int callback(unsigned int flags, void *arg)
> {
> //pthread_wakeup_np(rt_thread);
>
> return 1;
> }
>
> int init_module(void)
> {
> int ret = 0;
> pthread_attr_t attr;
> struct sched_param sched_param;
>
> // install rtf
> rtf_destroy(1);
> ret = rtf_create(1, 4096);
>
> [...]
>
> // lock the subdevices
> comedi_lock_ioctl(ai_dev,ai_subdev);
> comedi_lock_ioctl(ao_dev,ao_subdev);
>
> // ... create the realtime task with the default function
> pthread_attr_init(&attr);
> //pthread_attr_setstacksize(&attr, THREAD_STACK_SIZE);
> //sched_param.sched_priority = 100;
> //pthread_attr_setschedparam(&attr, &sched_param);
>
> rtl_printf("create thread\n");
> if((ret = pthread_create(&rt_thread, &attr, thread_code, (void *)0)) != 0) {
> rtl_printf("unable to create realtime thread (error %d) !\n", ret);
> }
>
> rtl_printf("set FP on thread\n");
> if((ret = pthread_setfp_np(rt_thread, 1)) != 0) {
> rtl_printf("unable to use floating-point operations in realtime thread
>(error %d) !\n",
> ret);
> }
>
> #if 0
> rtl_printf("register our callback function\n");
> ret=comedi_register_callback(ai_dev, ai_subdev, COMEDI_CB_EOS, &callback, (void
>*)0);
>
> /* start acq. */
> ret=comedi_trig_ioctl(ai_dev,ai_subdev,&ai_trig);
> #endif
>
> rtl_printf("comedi_callback module started\n");
>
> return 0;
> }
>
> void cleanup_module(void)
> {
> comedi_cancel_ioctl(ai_dev,ai_subdev);
> comedi_unlock_ioctl(ai_dev,ai_subdev);
> comedi_unlock_ioctl(ao_dev,ao_subdev);
>
> pthread_suspend_np(rt_thread);
> pthread_setfp_np(rt_thread, 0);
> pthread_delete_np(rt_thread);
>
> rtf_destroy(1);
>
> rtl_printf("comedi_callback stopped\n");
> }
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--
..........................................................................
Pavel Andris | tel: +421 7 5941 2167
Institute of Control Theory and Robotics | fax: +421 7 5477 6045
Slovak Academy of Sciences |
Dubravska cesta 9 | e-mail: [EMAIL PROTECTED]
SK - 842 37 Bratislava |
Slovakia |
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