#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <sys/time.h>

#define BUFFER_SIZE (128 * 1024 * 1024)  /* 128MB */

void *mychild(void *buffer) {
	struct timeval tv;
	u_int64_t t1, t2;

	gettimeofday(&tv, NULL);
	t1 = tv.tv_sec * 1000000 + tv.tv_usec;
	t2 = t1 + 6 * 1000000;
	/* heavy CPU/Mem job */
	srand(tv.tv_usec);
	while(t1 < t2) {
	    memset(buffer, rand(), BUFFER_SIZE);
            gettimeofday(&tv, NULL);
            t1 = tv.tv_sec * 1000000 + tv.tv_usec;
	}
	return NULL;
}

int main(int argc, char *argv[]) {
	pthread_t pthread;
	void *buffer = NULL;
	
	buffer = malloc(BUFFER_SIZE);
	if (!buffer)
	    return 1;

	sleep(4);
	pthread_create(&pthread, NULL, mychild, buffer);
	sleep(1);
	pthread_exit(0);
}