larg_stack.c

fsmlabs的real time linux的内核

#include <rtl.h>
#include <time.h>
#include <pthread.h>
#include <linux/slab.h> /* kmalloc */

pthread_t thread;

#define SIZE 10000 /* large ugly array */

void * start_routine(void *arg)
{
	struct sched_param p;
	unsigned long larg_array[SIZE]; /* the large aray */
	int i;
	p . sched_priority = 1;
	pthread_setschedparam (pthread_self(), SCHED_FIFO, &p);
	pthread_make_periodic_np (pthread_self(), gethrtime(), 500000000);

	/* fill up the large array */
	for(i=0;i<SIZE;i++){
		larg_array[i]=(unsigned long)i;
	}

	i=0;

	while (i<SIZE){
		pthread_wait_np ();
		rtl_printf("I'm here %lx\n",larg_array[i++]);
	}
	return (void *)0;
}

int init_module(void) {
	pthread_attr_t attr;
	pthread_attr_init(&attr);
	/* default stack size + large data block... */
	attr.stack_size = attr.stack_size + (SIZE*sizeof(unsigned long)); 
	attr.stack_addr = (int *)kmalloc(attr.stack_size,GFP_KERNEL);
	if(!attr.stack_addr){
		printk("failed to allocate stack\n");
		return -1;
	}
	return pthread_create(&thread,&attr,start_routine, (void *)0);
}

void cleanup_module(void) {
	void * retval;
	pthread_delete_np (thread);
	pthread_join(thread,&retval);
	printk("thread terminated with %d\n",(int)retval);
}