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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